i2c: transition pad/ports away from being based on nvkm_object

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

55 files changed, 2340 insertions, 2048 deletions

diff --git a/bin/nv_aux.c b/bin/nv_aux.c
index f8b7c802..743160c3 100644
--- a/bin/nv_aux.c
+++ b/bin/nv_aux.c
@@ -7,9 +7,9 @@
 #include <nvif/class.h>
 
 static void
-print_chan(struct nvkm_i2c_port *chan)
+print_aux(struct nvkm_i2c_aux *aux)
 {
-	printf("chan 0x%02x: type %04x\n", chan->index, nv_mclass(chan));
+	printf("aux %04x\n", aux->id);
 }
 
 int
@@ -21,7 +21,7 @@ main(int argc, char **argv)
 	u64 dev = ~0ULL;
 	struct nvif_client *client;
 	struct nvif_device *device;
-	struct nvkm_i2c_port *chan;
+	struct nvkm_i2c_aux *aux;
 	struct nvkm_i2c *i2c;
 	int action = -1, index = -1;
 	int addr = -1, val = -1;
@@ -84,23 +84,22 @@ main(int argc, char **argv)
 	i2c = nvxx_i2c(device);
 
 	if (action < 0) {
-		list_for_each_entry(chan, &i2c->ports, head) {
-			if ((nv_mclass(chan) & 0x00ff) == 0x06)
-				print_chan(chan);
+		list_for_each_entry(aux, &i2c->aux, head) {
+			print_aux(aux);
 		}
 	} else {
-		chan = i2c->find(i2c, index);
-		if (!chan || (nv_mclass(chan) & 0x00ff) != 0x06) {
+		aux = nvkm_i2c_aux_find(i2c, index);
+		if (!aux) {
 			ret = -ENOENT;
 			goto done;
 		}
 
-		print_chan(chan);
+		print_aux(aux);
 	}
 
 	switch (action) {
 	case 0:
-		ret = nv_rdaux(chan, addr, &data, 1);
+		ret = nvkm_rdaux(aux, addr, &data, 1);
 		printf("%05x: ", addr);
 		if (ret < 0)
 			printf("%s\n", strerror(ret));
@@ -109,7 +108,7 @@ main(int argc, char **argv)
 		break;
 	case 1:
 		printf("%05x: %02x", addr, data);
-		ret = nv_wraux(chan, addr, &data, 1);
+		ret = nvkm_wraux(aux, addr, &data, 1);
 		if (ret < 0)
 			printf(" - %s", strerror(ret));
 		printf("\n");
diff --git a/bin/nv_i2c.c b/bin/nv_i2c.c
index ee469f0a..ec0ce4a6 100644
--- a/bin/nv_i2c.c
+++ b/bin/nv_i2c.c
@@ -7,9 +7,32 @@
 #include <nvif/class.h>
 
 static void
-print_port(struct nvkm_i2c_port *port)
+show_adapter(struct i2c_adapter *adap, int adapter)
 {
-	printf("port 0x%02x: type %04x\n", port->index, nv_mclass(port));
+	printf("i2c %d: %s\n", adapter, adap->name);
+}
+
+static struct i2c_adapter *
+find_adapter(struct nvif_device *device, int adapter)
+{
+	struct nvkm_i2c *i2c = nvxx_device(device)->i2c;
+	struct nvkm_i2c_bus *bus;
+	struct nvkm_i2c_aux *aux;
+	int i = 0;
+
+	if (i2c) {
+		list_for_each_entry(bus, &i2c->bus, head) {
+			if (i++ == adapter)
+				return &bus->i2c;
+		}
+
+		list_for_each_entry(aux, &i2c->aux, head) {
+			if (i++ == adapter)
+				return &aux->i2c;
+		}
+	}
+
+	return NULL;
 }
 
 int
@@ -21,8 +44,7 @@ main(int argc, char **argv)
 	u64 dev = ~0ULL;
 	struct nvif_client *client;
 	struct nvif_device *device;
-	struct nvkm_i2c_port *port;
-	struct nvkm_i2c *i2c;
+	struct i2c_adapter *adap;
 	int addr = -1, reg = -1, val = -1;
 	int action = -1, index = -1;
 	int ret, c;
@@ -87,20 +109,18 @@ main(int argc, char **argv)
 	if (ret)
 		return ret;
 
-	i2c = nvxx_i2c(device);
-
 	if (action < 0) {
-		list_for_each_entry(port, &i2c->ports, head) {
-			print_port(port);
+		for (index = 0; (adap = find_adapter(device, index)); index++) {
+			show_adapter(adap, index);
 		}
 	} else {
-		port = i2c->find(i2c, index);
-		if (!port) {
+		adap = find_adapter(device, index);
+		if (!adap) {
 			ret = -ENOENT;
 			goto done;
 		}
 
-		print_port(port);
+		show_adapter(adap, index);
 	}
 
 	switch (action) {
@@ -109,7 +129,7 @@ main(int argc, char **argv)
 			for (addr = 0; addr < 128; addr++) {
 				if ((addr & 0x0f) == 0x00)
 					printf("%02x:", addr);
-				if ((val = nv_rdi2cr(port, addr, 0x00)) >= 0)
+				if ((val = nvkm_rdi2cr(adap, addr, 0x00)) >= 0)
 					printf(" %02x", addr);
 				else
 					printf(" --");
@@ -122,7 +142,7 @@ main(int argc, char **argv)
 			for (reg = 0; reg < 256; reg++) {
 				if ((reg & 0x0f) == 0x00)
 					printf("%02x:", reg);
-				if ((val = nv_rdi2cr(port, addr, reg)) >= 0)
+				if ((val = nvkm_rdi2cr(adap, addr, reg)) >= 0)
 					printf(" %02x", val);
 				else
 					printf(" --");
@@ -133,7 +153,7 @@ main(int argc, char **argv)
 		}
 		break;
 	case 2:
-		val = nv_rdi2cr(port, addr, reg);
+		val = nvkm_rdi2cr(adap, addr, reg);
 		printf("%02x[%02x]: ", addr, reg);
 		if (val < 0)
 			printf("%s\n", strerror(val));
@@ -142,7 +162,7 @@ main(int argc, char **argv)
 		break;
 	case 3:
 		printf("%02x[%02x]: %02x", addr, reg, val);
-		ret = nv_wri2cr(port, addr, reg, val);
+		ret = nvkm_wri2cr(adap, addr, reg, val);
 		if (ret < 0)
 			printf("%s", strerror(ret));
 		printf("\n");
diff --git a/drm/nouveau/dispnv04/dfp.c b/drm/nouveau/dispnv04/dfp.c
index 61b49c1d..a85e7251 100644
--- a/drm/nouveau/dispnv04/dfp.c
+++ b/drm/nouveau/dispnv04/dfp.c
@@ -624,8 +624,8 @@ static void nv04_tmds_slave_init(struct drm_encoder *encoder)
 	struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct nvkm_i2c *i2c = nvxx_i2c(&drm->device);
-	struct nvkm_i2c_port *port = i2c->find(i2c, 2);
-	struct nvkm_i2c_board_info info[] = {
+	struct nvkm_i2c_bus *bus = nvkm_i2c_bus_find(i2c, NVKM_I2C_BUS_PRI);
+	struct nvkm_i2c_bus_probe info[] = {
 		{
 		    {
 		        .type = "sil164",
@@ -639,16 +639,15 @@ static void nv04_tmds_slave_init(struct drm_encoder *encoder)
 	};
 	int type;
 
-	if (!nv_gf4_disp_arch(dev) || !port ||
-	    get_tmds_slave(encoder))
+	if (!nv_gf4_disp_arch(dev) || !bus || get_tmds_slave(encoder))
 		return;
 
-	type = i2c->identify(i2c, 2, "TMDS transmitter", info, NULL, NULL);
+	type = nvkm_i2c_bus_probe(bus, "TMDS transmitter", info, NULL, NULL);
 	if (type < 0)
 		return;
 
 	drm_i2c_encoder_init(dev, to_encoder_slave(encoder),
-			     &port->adapter, &info[type].dev);
+			     &bus->i2c, &info[type].dev);
 }
 
 static const struct drm_encoder_helper_funcs nv04_lvds_helper_funcs = {
diff --git a/drm/nouveau/dispnv04/disp.c b/drm/nouveau/dispnv04/disp.c
index 4131be55..018a4480 100644
--- a/drm/nouveau/dispnv04/disp.c
+++ b/drm/nouveau/dispnv04/disp.c
@@ -101,7 +101,9 @@ nv04_display_create(struct drm_device *dev)
 
 	list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
 		struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
-		nv_encoder->i2c = i2c->find(i2c, nv_encoder->dcb->i2c_index);
+		struct nvkm_i2c_bus *bus =
+			nvkm_i2c_bus_find(i2c, nv_encoder->dcb->i2c_index);
+		nv_encoder->i2c = bus ? &bus->i2c : NULL;
 	}
 
 	/* Save previous state */
diff --git a/drm/nouveau/dispnv04/tvnv04.c b/drm/nouveau/dispnv04/tvnv04.c
index 70e95cf6..5345eb53 100644
--- a/drm/nouveau/dispnv04/tvnv04.c
+++ b/drm/nouveau/dispnv04/tvnv04.c
@@ -35,7 +35,7 @@
 
 #include <drm/i2c/ch7006.h>
 
-static struct nvkm_i2c_board_info nv04_tv_encoder_info[] = {
+static struct nvkm_i2c_bus_probe nv04_tv_encoder_info[] = {
 	{
 		{
 			I2C_BOARD_INFO("ch7006", 0x75),
@@ -55,9 +55,13 @@ int nv04_tv_identify(struct drm_device *dev, int i2c_index)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct nvkm_i2c *i2c = nvxx_i2c(&drm->device);
-
-	return i2c->identify(i2c, i2c_index, "TV encoder",
-			     nv04_tv_encoder_info, NULL, NULL);
+	struct nvkm_i2c_bus *bus = nvkm_i2c_bus_find(i2c, i2c_index);
+	if (bus) {
+		return nvkm_i2c_bus_probe(bus, "TV encoder",
+					  nv04_tv_encoder_info,
+					  NULL, NULL);
+	}
+	return -ENODEV;
 }
 
 
@@ -205,7 +209,7 @@ nv04_tv_create(struct drm_connector *connector, struct dcb_output *entry)
 	struct drm_device *dev = connector->dev;
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	struct nvkm_i2c *i2c = nvxx_i2c(&drm->device);
-	struct nvkm_i2c_port *port = i2c->find(i2c, entry->i2c_index);
+	struct nvkm_i2c_bus *bus = nvkm_i2c_bus_find(i2c, entry->i2c_index);
 	int type, ret;
 
 	/* Ensure that we can talk to this encoder */
@@ -231,7 +235,7 @@ nv04_tv_create(struct drm_connector *connector, struct dcb_output *entry)
 
 	/* Run the slave-specific initialization */
 	ret = drm_i2c_encoder_init(dev, to_encoder_slave(encoder),
-				   &port->adapter,
+				   &bus->i2c,
 				   &nv04_tv_encoder_info[type].dev);
 	if (ret < 0)
 		goto fail_cleanup;
diff --git a/drm/nouveau/include/nvkm/subdev/i2c.h b/drm/nouveau/include/nvkm/subdev/i2c.h
index 6b71cb6d..ddc7e6e4 100644
--- a/drm/nouveau/include/nvkm/subdev/i2c.h
+++ b/drm/nouveau/include/nvkm/subdev/i2c.h
@@ -6,15 +6,6 @@
 #include <subdev/bios.h>
 #include <subdev/bios/i2c.h>
 
-#define NV_I2C_PORT(n)    (0x00 + (n))
-#define NV_I2C_AUX(n)     (0x10 + (n))
-#define NV_I2C_EXT(n)     (0x20 + (n))
-#define NV_I2C_DEFAULT(n) (0x80 + (n))
-
-#define NV_I2C_TYPE_DCBI2C(n) (0x0000 | (n))
-#define NV_I2C_TYPE_EXTDDC(e) (0x0005 | (e) << 8)
-#define NV_I2C_TYPE_EXTAUX(e) (0x0006 | (e) << 8)
-
 struct nvkm_i2c_ntfy_req {
 #define NVKM_I2C_PLUG                                                      0x01
 #define NVKM_I2C_UNPLUG                                                    0x02
@@ -29,55 +20,66 @@ struct nvkm_i2c_ntfy_rep {
 	u8 mask;
 };
 
-struct nvkm_i2c_port {
-	struct nvkm_object base;
-	struct i2c_adapter adapter;
-	struct mutex mutex;
+struct nvkm_i2c_bus_probe {
+	struct i2c_board_info dev;
+	u8 udelay; /* set to 0 to use the standard delay */
+};
 
-	struct list_head head;
-	u8  index;
-	int aux;
+struct nvkm_i2c_bus {
+	const struct nvkm_i2c_bus_func *func;
+	struct nvkm_i2c_pad *pad;
+#define NVKM_I2C_BUS_CCB(n) /* 'n' is ccb index */                           (n)
+#define NVKM_I2C_BUS_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
+#define NVKM_I2C_BUS_PRI /* ccb primary comm. port */                        -1
+#define NVKM_I2C_BUS_SEC /* ccb secondary comm. port */                      -2
+	int id;
 
-	const struct nvkm_i2c_func *func;
+	struct mutex mutex;
+	struct list_head head;
+	struct i2c_adapter i2c;
 };
 
-struct nvkm_i2c_func {
-	void (*drive_scl)(struct nvkm_i2c_port *, int);
-	void (*drive_sda)(struct nvkm_i2c_port *, int);
-	int  (*sense_scl)(struct nvkm_i2c_port *);
-	int  (*sense_sda)(struct nvkm_i2c_port *);
+int nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *);
+void nvkm_i2c_bus_release(struct nvkm_i2c_bus *);
+int nvkm_i2c_bus_probe(struct nvkm_i2c_bus *, const char *,
+		       struct nvkm_i2c_bus_probe *,
+		       bool (*)(struct nvkm_i2c_bus *,
+			        struct i2c_board_info *, void *), void *);
 
-	int  (*aux)(struct nvkm_i2c_port *, bool, u8, u32, u8 *, u8);
-	int  (*pattern)(struct nvkm_i2c_port *, int pattern);
-	int  (*lnk_ctl)(struct nvkm_i2c_port *, int nr, int bw, bool enh);
-	int  (*drv_ctl)(struct nvkm_i2c_port *, int lane, int sw, int pe);
-};
+struct nvkm_i2c_aux {
+	const struct nvkm_i2c_aux_func *func;
+	struct nvkm_i2c_pad *pad;
+#define NVKM_I2C_AUX_CCB(n) /* 'n' is ccb index */                           (n)
+#define NVKM_I2C_AUX_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x100)
+	int id;
 
-struct nvkm_i2c_board_info {
-	struct i2c_board_info dev;
-	u8 udelay; /* set to 0 to use the standard delay */
+	struct mutex mutex;
+	struct list_head head;
+	struct i2c_adapter i2c;
+
+	u32 intr;
 };
 
+void nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *, bool monitor);
+int nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *);
+void nvkm_i2c_aux_release(struct nvkm_i2c_aux *);
+int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type,
+		      u32 addr, u8 *data, u8 size);
+int nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *, int link_nr, int link_bw,
+			 bool enhanced_framing);
+
 struct nvkm_i2c {
 	struct nvkm_subdev subdev;
 	struct nvkm_event event;
 
-	struct nvkm_i2c_port *(*find)(struct nvkm_i2c *, u8 index);
-	struct nvkm_i2c_port *(*find_type)(struct nvkm_i2c *, u16 type);
-	int  (*acquire_pad)(struct nvkm_i2c_port *, unsigned long timeout);
-	void (*release_pad)(struct nvkm_i2c_port *);
-	int  (*acquire)(struct nvkm_i2c_port *, unsigned long timeout);
-	void (*release)(struct nvkm_i2c_port *);
-	int  (*identify)(struct nvkm_i2c *, int index,
-			 const char *what, struct nvkm_i2c_board_info *,
-			 bool (*match)(struct nvkm_i2c_port *,
-				       struct i2c_board_info *, void *),
-			 void *);
-
-	wait_queue_head_t wait;
-	struct list_head ports;
+	struct list_head pad;
+	struct list_head bus;
+	struct list_head aux;
 };
 
+struct nvkm_i2c_bus *nvkm_i2c_bus_find(struct nvkm_i2c *, int);
+struct nvkm_i2c_aux *nvkm_i2c_aux_find(struct nvkm_i2c *, int);
+
 static inline struct nvkm_i2c *
 nvkm_i2c(void *obj)
 {
@@ -94,7 +96,7 @@ extern struct nvkm_oclass *gk104_i2c_oclass;
 extern struct nvkm_oclass *gm204_i2c_oclass;
 
 static inline int
-nv_rdi2cr(struct nvkm_i2c_port *port, u8 addr, u8 reg)
+nvkm_rdi2cr(struct i2c_adapter *adap, u8 addr, u8 reg)
 {
 	u8 val;
 	struct i2c_msg msgs[] = {
@@ -102,7 +104,7 @@ nv_rdi2cr(struct nvkm_i2c_port *port, u8 addr, u8 reg)
 		{ .addr = addr, .flags = I2C_M_RD, .len = 1, .buf = &val },
 	};
 
-	int ret = i2c_transfer(&port->adapter, msgs, 2);
+	int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 	if (ret != 2)
 		return -EIO;
 
@@ -110,14 +112,14 @@ nv_rdi2cr(struct nvkm_i2c_port *port, u8 addr, u8 reg)
 }
 
 static inline int
-nv_wri2cr(struct nvkm_i2c_port *port, u8 addr, u8 reg, u8 val)
+nvkm_wri2cr(struct i2c_adapter *adap, u8 addr, u8 reg, u8 val)
 {
 	u8 buf[2] = { reg, val };
 	struct i2c_msg msgs[] = {
 		{ .addr = addr, .flags = 0, .len = 2, .buf = buf },
 	};
 
-	int ret = i2c_transfer(&port->adapter, msgs, 1);
+	int ret = i2c_transfer(adap, msgs, ARRAY_SIZE(msgs));
 	if (ret != 1)
 		return -EIO;
 
@@ -125,11 +127,30 @@ nv_wri2cr(struct nvkm_i2c_port *port, u8 addr, u8 reg, u8 val)
 }
 
 static inline bool
-nv_probe_i2c(struct nvkm_i2c_port *port, u8 addr)
+nvkm_probe_i2c(struct i2c_adapter *adap, u8 addr)
+{
+	return nvkm_rdi2cr(adap, addr, 0) >= 0;
+}
+
+static inline int
+nvkm_rdaux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
 {
-	return nv_rdi2cr(port, addr, 0) >= 0;
+	int ret = nvkm_i2c_aux_acquire(aux);
+	if (ret == 0) {
+		ret = nvkm_i2c_aux_xfer(aux, true, 9, addr, data, size);
+		nvkm_i2c_aux_release(aux);
+	}
+	return ret;
 }
 
-int nv_rdaux(struct nvkm_i2c_port *, u32 addr, u8 *data, u8 size);
-int nv_wraux(struct nvkm_i2c_port *, u32 addr, u8 *data, u8 size);
+static inline int
+nvkm_wraux(struct nvkm_i2c_aux *aux, u32 addr, u8 *data, u8 size)
+{
+	int ret = nvkm_i2c_aux_acquire(aux);
+	if (ret == 0) {
+		ret = nvkm_i2c_aux_xfer(aux, true, 8, addr, data, size);
+		nvkm_i2c_aux_release(aux);
+	}
+	return ret;
+}
 #endif
diff --git a/drm/nouveau/nouveau_bios.c b/drm/nouveau/nouveau_bios.c
index c6dbfaf4..3199479a 100644
--- a/drm/nouveau/nouveau_bios.c
+++ b/drm/nouveau/nouveau_bios.c
@@ -1495,7 +1495,6 @@ parse_dcb20_entry(struct drm_device *dev, struct dcb_table *dcb,
 			break;
 		}
 		link = entry->dpconf.sor.link;
-		entry->i2c_index += NV_I2C_AUX(0);
 		break;
 	case DCB_OUTPUT_TMDS:
 		if (dcb->version >= 0x40) {
diff --git a/drm/nouveau/nouveau_connector.c b/drm/nouveau/nouveau_connector.c
index 1f26eba2..054f0f25 100644
--- a/drm/nouveau/nouveau_connector.c
+++ b/drm/nouveau/nouveau_connector.c
@@ -148,7 +148,7 @@ nouveau_connector_ddc_detect(struct drm_connector *connector)
 				break;
 		} else
 		if (nv_encoder->i2c) {
-			if (nv_probe_i2c(nv_encoder->i2c, 0x50))
+			if (nvkm_probe_i2c(nv_encoder->i2c, 0x50))
 				break;
 		}
 	}
@@ -241,7 +241,7 @@ nouveau_connector_detect(struct drm_connector *connector, bool force)
 	struct nouveau_connector *nv_connector = nouveau_connector(connector);
 	struct nouveau_encoder *nv_encoder = NULL;
 	struct nouveau_encoder *nv_partner;
-	struct nvkm_i2c_port *i2c;
+	struct i2c_adapter *i2c;
 	int type;
 	int ret;
 	enum drm_connector_status conn_status = connector_status_disconnected;
@@ -259,7 +259,7 @@ nouveau_connector_detect(struct drm_connector *connector, bool force)
 
 	nv_encoder = nouveau_connector_ddc_detect(connector);
 	if (nv_encoder && (i2c = nv_encoder->i2c) != NULL) {
-		nv_connector->edid = drm_get_edid(connector, &i2c->adapter);
+		nv_connector->edid = drm_get_edid(connector, i2c);
 		drm_mode_connector_update_edid_property(connector,
 							nv_connector->edid);
 		if (!nv_connector->edid) {
@@ -930,11 +930,11 @@ nouveau_connector_dp_dpms(struct drm_connector *connector, int mode)
 	    nv_encoder->dcb->type == DCB_OUTPUT_DP) {
 		if (mode == DRM_MODE_DPMS_ON) {
 			u8 data = DP_SET_POWER_D0;
-			nv_wraux(nv_encoder->i2c, DP_SET_POWER, &data, 1);
+			nvkm_wraux(nv_encoder->aux, DP_SET_POWER, &data, 1);
 			usleep_range(1000, 2000);
 		} else {
 			u8 data = DP_SET_POWER_D3;
-			nv_wraux(nv_encoder->i2c, DP_SET_POWER, &data, 1);
+			nvkm_wraux(nv_encoder->aux, DP_SET_POWER, &data, 1);
 		}
 	}
 
@@ -980,29 +980,29 @@ nouveau_connector_hotplug(struct nvif_notify *notify)
 }
 
 static ssize_t
-nouveau_connector_aux_xfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
+nouveau_connector_aux_xfer(struct drm_dp_aux *obj, struct drm_dp_aux_msg *msg)
 {
 	struct nouveau_connector *nv_connector =
-		container_of(aux, typeof(*nv_connector), aux);
+		container_of(obj, typeof(*nv_connector), aux);
 	struct nouveau_encoder *nv_encoder;
-	struct nvkm_i2c_port *port;
+	struct nvkm_i2c_aux *aux;
 	int ret;
 
 	nv_encoder = find_encoder(&nv_connector->base, DCB_OUTPUT_DP);
-	if (!nv_encoder || !(port = nv_encoder->i2c))
+	if (!nv_encoder || !(aux = nv_encoder->aux))
 		return -ENODEV;
 	if (WARN_ON(msg->size > 16))
 		return -E2BIG;
 	if (msg->size == 0)
 		return msg->size;
 
-	ret = nvkm_i2c(port)->acquire(port, 0);
+	ret = nvkm_i2c_aux_acquire(aux);
 	if (ret)
 		return ret;
 
-	ret = port->func->aux(port, false, msg->request, msg->address,
-			      msg->buffer, msg->size);
-	nvkm_i2c(port)->release(port);
+	ret = nvkm_i2c_aux_xfer(aux, false, msg->request, msg->address,
+				msg->buffer, msg->size);
+	nvkm_i2c_aux_release(aux);
 	if (ret >= 0) {
 		msg->reply = ret;
 		return msg->size;
diff --git a/drm/nouveau/nouveau_dp.c b/drm/nouveau/nouveau_dp.c
index c3ef30b3..e17e15ec 100644
--- a/drm/nouveau/nouveau_dp.c
+++ b/drm/nouveau/nouveau_dp.c
@@ -31,8 +31,7 @@
 #include "nouveau_crtc.h"
 
 static void
-nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_port *auxch,
-		     u8 *dpcd)
+nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_aux *aux, u8 *dpcd)
 {
 	struct nouveau_drm *drm = nouveau_drm(dev);
 	u8 buf[3];
@@ -40,11 +39,11 @@ nouveau_dp_probe_oui(struct drm_device *dev, struct nvkm_i2c_port *auxch,
 	if (!(dpcd[DP_DOWN_STREAM_PORT_COUNT] & DP_OUI_SUPPORT))
 		return;
 
-	if (!nv_rdaux(auxch, DP_SINK_OUI, buf, 3))
+	if (!nvkm_rdaux(aux, DP_SINK_OUI, buf, 3))
 		NV_DEBUG(drm, "Sink OUI: %02hx%02hx%02hx\n",
 			     buf[0], buf[1], buf[2]);
 
-	if (!nv_rdaux(auxch, DP_BRANCH_OUI, buf, 3))
+	if (!nvkm_rdaux(aux, DP_BRANCH_OUI, buf, 3))
 		NV_DEBUG(drm, "Branch OUI: %02hx%02hx%02hx\n",
 			     buf[0], buf[1], buf[2]);
 
@@ -55,15 +54,15 @@ nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
 {
 	struct drm_device *dev = nv_encoder->base.base.dev;
 	struct nouveau_drm *drm = nouveau_drm(dev);
-	struct nvkm_i2c_port *auxch;
+	struct nvkm_i2c_aux *aux;
 	u8 *dpcd = nv_encoder->dp.dpcd;
 	int ret;
 
-	auxch = nv_encoder->i2c;
-	if (!auxch)
+	aux = nv_encoder->aux;
+	if (!aux)
 		return -ENODEV;
 
-	ret = nv_rdaux(auxch, DP_DPCD_REV, dpcd, 8);
+	ret = nvkm_rdaux(aux, DP_DPCD_REV, dpcd, 8);
 	if (ret)
 		return ret;
 
@@ -84,6 +83,6 @@ nouveau_dp_detect(struct nouveau_encoder *nv_encoder)
 	NV_DEBUG(drm, "maximum: %dx%d\n",
 		     nv_encoder->dp.link_nr, nv_encoder->dp.link_bw);
 
-	nouveau_dp_probe_oui(dev, auxch, dpcd);
+	nouveau_dp_probe_oui(dev, aux, dpcd);
 	return 0;
 }
diff --git a/drm/nouveau/nouveau_encoder.h b/drm/nouveau/nouveau_encoder.h
index c57a37e8..b37da951 100644
--- a/drm/nouveau/nouveau_encoder.h
+++ b/drm/nouveau/nouveau_encoder.h
@@ -41,7 +41,9 @@ struct nouveau_encoder {
 
 	struct dcb_output *dcb;
 	int or;
-	struct nvkm_i2c_port *i2c;
+
+	struct i2c_adapter *i2c;
+	struct nvkm_i2c_aux *aux;
 
 	/* different to drm_encoder.crtc, this reflects what's
 	 * actually programmed on the hw, not the proposed crtc */
diff --git a/drm/nouveau/nv50_display.c b/drm/nouveau/nv50_display.c
index cb41437c..c56775f5 100644
--- a/drm/nouveau/nv50_display.c
+++ b/drm/nouveau/nv50_display.c
@@ -1688,6 +1688,7 @@ nv50_dac_create(struct drm_connector *connector, struct dcb_output *dcbe)
 {
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 	struct nvkm_i2c *i2c = nvxx_i2c(&drm->device);
+	struct nvkm_i2c_bus *bus;
 	struct nouveau_encoder *nv_encoder;
 	struct drm_encoder *encoder;
 	int type = DRM_MODE_ENCODER_DAC;
@@ -1697,7 +1698,10 @@ nv50_dac_create(struct drm_connector *connector, struct dcb_output *dcbe)
 		return -ENOMEM;
 	nv_encoder->dcb = dcbe;
 	nv_encoder->or = ffs(dcbe->or) - 1;
-	nv_encoder->i2c = i2c->find(i2c, dcbe->i2c_index);
+
+	bus = nvkm_i2c_bus_find(i2c, dcbe->i2c_index);
+	if (bus)
+		nv_encoder->i2c = &bus->i2c;
 
 	encoder = to_drm_encoder(nv_encoder);
 	encoder->possible_crtcs = dcbe->heads;
@@ -2091,9 +2095,22 @@ nv50_sor_create(struct drm_connector *connector, struct dcb_output *dcbe)
 		return -ENOMEM;
 	nv_encoder->dcb = dcbe;
 	nv_encoder->or = ffs(dcbe->or) - 1;
-	nv_encoder->i2c = i2c->find(i2c, dcbe->i2c_index);
 	nv_encoder->last_dpms = DRM_MODE_DPMS_OFF;
 
+	if (dcbe->type == DCB_OUTPUT_DP) {
+		struct nvkm_i2c_aux *aux =
+			nvkm_i2c_aux_find(i2c, dcbe->i2c_index);
+		if (aux) {
+			nv_encoder->i2c = &aux->i2c;
+			nv_encoder->aux = aux;
+		}
+	} else {
+		struct nvkm_i2c_bus *bus =
+			nvkm_i2c_bus_find(i2c, dcbe->i2c_index);
+		if (bus)
+			nv_encoder->i2c = &bus->i2c;
+	}
+
 	encoder = to_drm_encoder(nv_encoder);
 	encoder->possible_crtcs = dcbe->heads;
 	encoder->possible_clones = 0;
@@ -2244,18 +2261,22 @@ nv50_pior_create(struct drm_connector *connector, struct dcb_output *dcbe)
 {
 	struct nouveau_drm *drm = nouveau_drm(connector->dev);
 	struct nvkm_i2c *i2c = nvxx_i2c(&drm->device);
-	struct nvkm_i2c_port *ddc = NULL;
+	struct nvkm_i2c_bus *bus = NULL;
+	struct nvkm_i2c_aux *aux = NULL;
+	struct i2c_adapter *ddc;
 	struct nouveau_encoder *nv_encoder;
 	struct drm_encoder *encoder;
 	int type;
 
 	switch (dcbe->type) {
 	case DCB_OUTPUT_TMDS:
-		ddc  = i2c->find_type(i2c, NV_I2C_TYPE_EXTDDC(dcbe->extdev));
+		bus  = nvkm_i2c_bus_find(i2c, NVKM_I2C_BUS_EXT(dcbe->extdev));
+		ddc  = bus ? &bus->i2c : NULL;
 		type = DRM_MODE_ENCODER_TMDS;
 		break;
 	case DCB_OUTPUT_DP:
-		ddc  = i2c->find_type(i2c, NV_I2C_TYPE_EXTAUX(dcbe->extdev));
+		aux  = nvkm_i2c_aux_find(i2c, NVKM_I2C_AUX_EXT(dcbe->extdev));
+		ddc  = aux ? &aux->i2c : NULL;
 		type = DRM_MODE_ENCODER_TMDS;
 		break;
 	default:
@@ -2268,6 +2289,7 @@ nv50_pior_create(struct drm_connector *connector, struct dcb_output *dcbe)
 	nv_encoder->dcb = dcbe;
 	nv_encoder->or = ffs(dcbe->or) - 1;
 	nv_encoder->i2c = ddc;
+	nv_encoder->aux = aux;
 
 	encoder = to_drm_encoder(nv_encoder);
 	encoder->possible_crtcs = dcbe->heads;
diff --git a/drm/nouveau/nvkm/engine/disp/dport.c b/drm/nouveau/nvkm/engine/disp/dport.c
index 5df7eeb5..d671da6d 100644
--- a/drm/nouveau/nvkm/engine/disp/dport.c
+++ b/drm/nouveau/nvkm/engine/disp/dport.c
@@ -98,7 +98,7 @@ dp_set_link_config(struct dp_state *dp)
 	if (outp->dpcd[DPCD_RC02] & DPCD_RC02_ENHANCED_FRAME_CAP)
 		sink[1] |= DPCD_LC01_ENHANCED_FRAME_EN;
 
-	return nv_wraux(outp->base.edid, DPCD_LC00_LINK_BW_SET, sink, 2);
+	return nvkm_wraux(outp->aux, DPCD_LC00_LINK_BW_SET, sink, 2);
 }
 
 static void
@@ -111,10 +111,10 @@ dp_set_training_pattern(struct dp_state *dp, u8 pattern)
 	DBG("training pattern %d\n", pattern);
 	impl->pattern(outp, pattern);
 
-	nv_rdaux(outp->base.edid, DPCD_LC02, &sink_tp, 1);
+	nvkm_rdaux(outp->aux, DPCD_LC02, &sink_tp, 1);
 	sink_tp &= ~DPCD_LC02_TRAINING_PATTERN_SET;
 	sink_tp |= pattern;
-	nv_wraux(outp->base.edid, DPCD_LC02, &sink_tp, 1);
+	nvkm_wraux(outp->aux, DPCD_LC02, &sink_tp, 1);
 }
 
 static int
@@ -150,12 +150,12 @@ dp_link_train_commit(struct dp_state *dp, bool pc)
 		impl->drv_ctl(outp, i, lvsw & 3, lpre & 3, lpc2 & 3);
 	}
 
-	ret = nv_wraux(outp->base.edid, DPCD_LC03(0), dp->conf, 4);
+	ret = nvkm_wraux(outp->aux, DPCD_LC03(0), dp->conf, 4);
 	if (ret)
 		return ret;
 
 	if (pc) {
-		ret = nv_wraux(outp->base.edid, DPCD_LC0F, dp->pc2conf, 2);
+		ret = nvkm_wraux(outp->aux, DPCD_LC0F, dp->pc2conf, 2);
 		if (ret)
 			return ret;
 	}
@@ -174,12 +174,12 @@ dp_link_train_update(struct dp_state *dp, bool pc, u32 delay)
 	else
 		udelay(delay);
 
-	ret = nv_rdaux(outp->base.edid, DPCD_LS02, dp->stat, 6);
+	ret = nvkm_rdaux(outp->aux, DPCD_LS02, dp->stat, 6);
 	if (ret)
 		return ret;
 
 	if (pc) {
-		ret = nv_rdaux(outp->base.edid, DPCD_LS0C, &dp->pc2stat, 1);
+		ret = nvkm_rdaux(outp->aux, DPCD_LS0C, &dp->pc2stat, 1);
 		if (ret)
 			dp->pc2stat = 0x00;
 		DBG("status %6ph pc2 %02x\n", dp->stat, dp->pc2stat);
diff --git a/drm/nouveau/nvkm/engine/disp/outp.c b/drm/nouveau/nvkm/engine/disp/outp.c
index 9224bcbf..88a990ec 100644
--- a/drm/nouveau/nvkm/engine/disp/outp.c
+++ b/drm/nouveau/nvkm/engine/disp/outp.c
@@ -86,11 +86,7 @@ nvkm_output_create_(struct nvkm_object *parent,
 	    dcbE->sorconf.link : 0, dcbE->connector, dcbE->i2c_index,
 	    dcbE->bus, dcbE->heads);
 
-	if (outp->info.type != DCB_OUTPUT_DP)
-		outp->port = i2c->find(i2c, NV_I2C_PORT(outp->info.i2c_index));
-	else
-		outp->port = i2c->find(i2c, NV_I2C_AUX(outp->info.i2c_index));
-	outp->edid = outp->port;
+	outp->i2c = nvkm_i2c_bus_find(i2c, outp->info.i2c_index);
 
 	data = nvbios_connEp(bios, outp->info.connector, &ver, &hdr, &connE);
 	if (!data) {
diff --git a/drm/nouveau/nvkm/engine/disp/outp.h b/drm/nouveau/nvkm/engine/disp/outp.h
index 6b854085..fb2ce7ca 100644
--- a/drm/nouveau/nvkm/engine/disp/outp.h
+++ b/drm/nouveau/nvkm/engine/disp/outp.h
@@ -13,8 +13,8 @@ struct nvkm_output {
 	int index;
 	int or;
 
-	struct nvkm_i2c_port *port;
-	struct nvkm_i2c_port *edid;
+	// whatever (if anything) is pointed at by the dcb device entry
+	struct nvkm_i2c_bus *i2c;
 
 	struct nvkm_connector *conn;
 };
diff --git a/drm/nouveau/nvkm/engine/disp/outpdp.c b/drm/nouveau/nvkm/engine/disp/outpdp.c
index 0bde0fa5..dac6f17b 100644
--- a/drm/nouveau/nvkm/engine/disp/outpdp.c
+++ b/drm/nouveau/nvkm/engine/disp/outpdp.c
@@ -40,7 +40,7 @@ nvkm_output_dp_train(struct nvkm_output *base, u32 datarate, bool wait)
 	int ret, i;
 
 	/* check that the link is trained at a high enough rate */
-	ret = nv_rdaux(outp->base.edid, DPCD_LC00_LINK_BW_SET, link, 2);
+	ret = nvkm_rdaux(outp->aux, DPCD_LC00_LINK_BW_SET, link, 2);
 	if (ret) {
 		DBG("failed to read link config, assuming no sink\n");
 		goto done;
@@ -55,7 +55,7 @@ nvkm_output_dp_train(struct nvkm_output *base, u32 datarate, bool wait)
 	}
 
 	/* check that link is still trained */
-	ret = nv_rdaux(outp->base.edid, DPCD_LS02, stat, 3);
+	ret = nvkm_rdaux(outp->aux, DPCD_LS02, stat, 3);
 	if (ret) {
 		DBG("failed to read link status, assuming no sink\n");
 		goto done;
@@ -102,37 +102,31 @@ done:
 }
 
 static void
-nvkm_output_dp_enable(struct nvkm_output_dp *outp, bool present)
+nvkm_output_dp_enable(struct nvkm_output_dp *outp, bool enable)
 {
-	struct nvkm_i2c_port *port = outp->base.edid;
-	if (present) {
+	struct nvkm_i2c_aux *aux = outp->aux;
+
+	if (enable) {
 		if (!outp->present) {
-			nvkm_i2c(port)->acquire_pad(port, 0);
 			DBG("aux power -> always\n");
+			nvkm_i2c_aux_monitor(aux, true);
 			outp->present = true;
 		}
-		nvkm_output_dp_train(&outp->base, 0, true);
-	} else {
-		if (outp->present) {
-			nvkm_i2c(port)->release_pad(port);
-			DBG("aux power -> demand\n");
-			outp->present = false;
+
+		if (!nvkm_rdaux(aux, DPCD_RC00_DPCD_REV, outp->dpcd,
+				sizeof(outp->dpcd))) {
+			nvkm_output_dp_train(&outp->base, 0, true);
+			return;
 		}
-		atomic_set(&outp->lt.done, 0);
 	}
-}
 
-static void
-nvkm_output_dp_detect(struct nvkm_output_dp *outp)
-{
-	struct nvkm_i2c_port *port = outp->base.edid;
-	int ret = nvkm_i2c(port)->acquire_pad(port, 0);
-	if (ret == 0) {
-		ret = nv_rdaux(outp->base.edid, DPCD_RC00_DPCD_REV,
-			       outp->dpcd, sizeof(outp->dpcd));
-		nvkm_output_dp_enable(outp, ret == 0);
-		nvkm_i2c(port)->release_pad(port);
+	if (outp->present) {
+		DBG("aux power -> demand\n");
+		nvkm_i2c_aux_monitor(aux, false);
+		outp->present = false;
 	}
+
+	atomic_set(&outp->lt.done, 0);
 }
 
 static int
@@ -148,7 +142,7 @@ nvkm_output_dp_hpd(struct nvkm_notify *notify)
 		if (outp->base.conn == conn &&
 		    outp->info.type == DCB_OUTPUT_DP) {
 			DBG("HPD: %d\n", line->mask);
-			nvkm_output_dp_detect(outp);
+			nvkm_output_dp_enable(outp, true);
 
 			if (line->mask & NVKM_I2C_UNPLUG)
 				rep.mask |= NVIF_NOTIFY_CONN_V0_UNPLUG;
@@ -196,7 +190,7 @@ int
 _nvkm_output_dp_init(struct nvkm_object *object)
 {
 	struct nvkm_output_dp *outp = (void *)object;
-	nvkm_output_dp_detect(outp);
+	nvkm_output_dp_enable(outp, true);
 	return nvkm_output_init(&outp->base);
 }
 
@@ -231,7 +225,9 @@ nvkm_output_dp_create_(struct nvkm_object *parent,
 	nvkm_notify_fini(&outp->base.conn->hpd);
 
 	/* access to the aux channel is not optional... */
-	if (!outp->base.edid) {
+	//XXX: breaks anx support
+	outp->aux = nvkm_i2c_aux_find(i2c, outp->base.info.i2c_index);
+	if (!outp->aux) {
 		ERR("aux channel not found\n");
 		return -ENODEV;
 	}
@@ -256,7 +252,7 @@ nvkm_output_dp_create_(struct nvkm_object *parent,
 	ret = nvkm_notify_init(NULL, &i2c->event, nvkm_output_dp_irq, true,
 			       &(struct nvkm_i2c_ntfy_req) {
 				.mask = NVKM_I2C_IRQ,
-				.port = outp->base.edid->index,
+				.port = outp->aux->id,
 			       },
 			       sizeof(struct nvkm_i2c_ntfy_req),
 			       sizeof(struct nvkm_i2c_ntfy_rep),
@@ -270,7 +266,7 @@ nvkm_output_dp_create_(struct nvkm_object *parent,
 	ret = nvkm_notify_init(NULL, &i2c->event, nvkm_output_dp_hpd, true,
 			       &(struct nvkm_i2c_ntfy_req) {
 				.mask = NVKM_I2C_PLUG | NVKM_I2C_UNPLUG,
-				.port = outp->base.edid->index,
+				.port = outp->aux->id,
 			       },
 			       sizeof(struct nvkm_i2c_ntfy_req),
 			       sizeof(struct nvkm_i2c_ntfy_rep),
diff --git a/drm/nouveau/nvkm/engine/disp/outpdp.h b/drm/nouveau/nvkm/engine/disp/outpdp.h
index 70c77aec..f90e84c5 100644
--- a/drm/nouveau/nvkm/engine/disp/outpdp.h
+++ b/drm/nouveau/nvkm/engine/disp/outpdp.h
@@ -12,6 +12,8 @@ struct nvkm_output_dp {
 	struct nvbios_dpout info;
 	u8 version;
 
+	struct nvkm_i2c_aux *aux;
+
 	struct nvkm_notify irq;
 	bool present;
 	u8 dpcd[16];
diff --git a/drm/nouveau/nvkm/engine/disp/piornv50.c b/drm/nouveau/nvkm/engine/disp/piornv50.c
index 406ba2f4..ac122d72 100644
--- a/drm/nouveau/nvkm/engine/disp/piornv50.c
+++ b/drm/nouveau/nvkm/engine/disp/piornv50.c
@@ -41,7 +41,6 @@ nv50_pior_tmds_ctor(struct nvkm_object *parent,
 		    struct nvkm_oclass *oclass, void *info, u32 index,
 		    struct nvkm_object **pobject)
 {
-	struct nvkm_i2c *i2c = nvkm_i2c(parent);
 	struct nvkm_output *outp;
 	int ret;
 
@@ -50,7 +49,6 @@ nv50_pior_tmds_ctor(struct nvkm_object *parent,
 	if (ret)
 		return ret;
 
-	outp->edid = i2c->find_type(i2c, NV_I2C_TYPE_EXTDDC(outp->info.extdev));
 	return 0;
 }
 
@@ -72,10 +70,7 @@ nv50_pior_tmds_impl = {
 static int
 nv50_pior_dp_pattern(struct nvkm_output_dp *outp, int pattern)
 {
-	struct nvkm_i2c_port *port = outp->base.edid;
-	if (port && port->func->pattern)
-		return port->func->pattern(port, pattern);
-	return port ? 0 : -ENODEV;
+	return -ENODEV;
 }
 
 static int
@@ -87,19 +82,13 @@ nv50_pior_dp_lnk_pwr(struct nvkm_output_dp *outp, int nr)
 static int
 nv50_pior_dp_lnk_ctl(struct nvkm_output_dp *outp, int nr, int bw, bool ef)
 {
-	struct nvkm_i2c_port *port = outp->base.edid;
-	if (port && port->func->lnk_ctl)
-		return port->func->lnk_ctl(port, nr, bw, ef);
-	return port ? 0 : -ENODEV;
+	return nvkm_i2c_aux_lnk_ctl(outp->aux, nr, bw, ef);
 }
 
 static int
 nv50_pior_dp_drv_ctl(struct nvkm_output_dp *outp, int ln, int vs, int pe, int pc)
 {
-	struct nvkm_i2c_port *port = outp->base.edid;
-	if (port && port->func->drv_ctl)
-		return port->func->drv_ctl(port, ln, vs, pe);
-	return port ? 0 : -ENODEV;
+	return -ENODEV;
 }
 
 static int
@@ -117,8 +106,7 @@ nv50_pior_dp_ctor(struct nvkm_object *parent,
 	if (ret)
 		return ret;
 
-	outp->base.edid = i2c->find_type(i2c, NV_I2C_TYPE_EXTAUX(
-					 outp->base.info.extdev));
+	outp->aux = nvkm_i2c_aux_find(i2c, NVKM_I2C_AUX_EXT(outp->base.info.extdev));
 	return 0;
 }
 
diff --git a/drm/nouveau/nvkm/subdev/bios/i2c.c b/drm/nouveau/nvkm/subdev/bios/i2c.c
index 7380f01b..0fc60be3 100644
--- a/drm/nouveau/nvkm/subdev/bios/i2c.c
+++ b/drm/nouveau/nvkm/subdev/bios/i2c.c
@@ -76,8 +76,8 @@ dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
 	if (ent) {
 		if (ver >= 0x41) {
 			u32 ent_value = nvbios_rd32(bios, ent);
-			u8 i2c_port = (ent_value >> 27) & 0x1f;
-			u8 dpaux_port = (ent_value >> 22) & 0x1f;
+			u8 i2c_port = (ent_value >> 0) & 0x1f;
+			u8 dpaux_port = (ent_value >> 5) & 0x1f;
 			/* value 0x1f means unused according to DCB 4.x spec */
 			if (i2c_port == 0x1f && dpaux_port == 0x1f)
 				info->type = DCB_I2C_UNUSED;
diff --git a/drm/nouveau/nvkm/subdev/bios/init.c b/drm/nouveau/nvkm/subdev/bios/init.c
index 8b175d8c..c2c2d90e 100644
--- a/drm/nouveau/nvkm/subdev/bios/init.c
+++ b/drm/nouveau/nvkm/subdev/bios/init.c
@@ -259,62 +259,60 @@ init_wrvgai(struct nvbios_init *init, u16 port, u8 index, u8 value)
 	}
 }
 
-static struct nvkm_i2c_port *
+static struct i2c_adapter *
 init_i2c(struct nvbios_init *init, int index)
 {
-	struct nvkm_i2c *i2c = nvkm_i2c(init->bios);
+	struct nvkm_i2c *i2c = init->bios->subdev.device->i2c;
+	struct nvkm_i2c_bus *bus;
 
 	if (index == 0xff) {
-		index = NV_I2C_DEFAULT(0);
+		index = NVKM_I2C_BUS_PRI;
 		if (init->outp && init->outp->i2c_upper_default)
-			index = NV_I2C_DEFAULT(1);
-	} else
-	if (index < 0) {
-		if (!init->outp) {
-			if (init_exec(init))
-				error("script needs output for i2c\n");
-			return NULL;
-		}
-
-		if (index == -2 && init->outp->location) {
-			index = NV_I2C_TYPE_EXTAUX(init->outp->extdev);
-			return i2c->find_type(i2c, index);
-		}
-
-		index = init->outp->i2c_index;
-		if (init->outp->type == DCB_OUTPUT_DP)
-			index += NV_I2C_AUX(0);
+			index = NVKM_I2C_BUS_SEC;
 	}
 
-	return i2c->find(i2c, index);
+	bus = nvkm_i2c_bus_find(i2c, index);
+	return bus ? &bus->i2c : NULL;
 }
 
 static int
 init_rdi2cr(struct nvbios_init *init, u8 index, u8 addr, u8 reg)
 {
-	struct nvkm_i2c_port *port = init_i2c(init, index);
-	if (port && init_exec(init))
-		return nv_rdi2cr(port, addr, reg);
+	struct i2c_adapter *adap = init_i2c(init, index);
+	if (adap && init_exec(init))
+		return nvkm_rdi2cr(adap, addr, reg);
 	return -ENODEV;
 }
 
 static int
 init_wri2cr(struct nvbios_init *init, u8 index, u8 addr, u8 reg, u8 val)
 {
-	struct nvkm_i2c_port *port = init_i2c(init, index);
-	if (port && init_exec(init))
-		return nv_wri2cr(port, addr, reg, val);
+	struct i2c_adapter *adap = init_i2c(init, index);
+	if (adap && init_exec(init))
+		return nvkm_wri2cr(adap, addr, reg, val);
 	return -ENODEV;
 }
 
+static struct nvkm_i2c_aux *
+init_aux(struct nvbios_init *init)
+{
+	struct nvkm_i2c *i2c = init->bios->subdev.device->i2c;
+	if (!init->outp) {
+		if (init_exec(init))
+			error("script needs output for aux\n");
+		return NULL;
+	}
+	return nvkm_i2c_aux_find(i2c, init->outp->i2c_index);
+}
+
 static u8
 init_rdauxr(struct nvbios_init *init, u32 addr)
 {
-	struct nvkm_i2c_port *port = init_i2c(init, -2);
+	struct nvkm_i2c_aux *aux = init_aux(init);
 	u8 data;
 
-	if (port && init_exec(init)) {
-		int ret = nv_rdaux(port, addr, &data, 1);
+	if (aux && init_exec(init)) {
+		int ret = nvkm_rdaux(aux, addr, &data, 1);
 		if (ret == 0)
 			return data;
 		trace("auxch read failed with %d\n", ret);
@@ -326,9 +324,9 @@ init_rdauxr(struct nvbios_init *init, u32 addr)
 static int
 init_wrauxr(struct nvbios_init *init, u32 addr, u8 data)
 {
-	struct nvkm_i2c_port *port = init_i2c(init, -2);
-	if (port && init_exec(init)) {
-		int ret = nv_wraux(port, addr, &data, 1);
+	struct nvkm_i2c_aux *aux = init_aux(init);
+	if (aux && init_exec(init)) {
+		int ret = nvkm_wraux(aux, addr, &data, 1);
 		if (ret)
 			trace("auxch write failed with %d\n", ret);
 		return ret;
@@ -1065,13 +1063,13 @@ init_zm_i2c(struct nvbios_init *init)
 	}
 
 	if (init_exec(init)) {
-		struct nvkm_i2c_port *port = init_i2c(init, index);
+		struct i2c_adapter *adap = init_i2c(init, index);
 		struct i2c_msg msg = {
 			.addr = addr, .flags = 0, .len = count, .buf = data,
 		};
 		int ret;
 
-		if (port && (ret = i2c_transfer(&port->adapter, &msg, 1)) != 1)
+		if (adap && (ret = i2c_transfer(adap, &msg, 1)) != 1)
 			warn("i2c wr failed, %d\n", ret);
 	}
 }
@@ -2127,15 +2125,15 @@ init_i2c_long_if(struct nvbios_init *init)
 	u8 reghi = nvbios_rd08(bios, init->offset + 4);
 	u8  mask = nvbios_rd08(bios, init->offset + 5);
 	u8  data = nvbios_rd08(bios, init->offset + 6);
-	struct nvkm_i2c_port *port;
+	struct i2c_adapter *adap;
 
 	trace("I2C_LONG_IF\t"
 	      "I2C[0x%02x][0x%02x][0x%02x%02x] & 0x%02x == 0x%02x\n",
 	      index, addr, reglo, reghi, mask, data);
 	init->offset += 7;
 
-	port = init_i2c(init, index);
-	if (port) {
+	adap = init_i2c(init, index);
+	if (adap) {
 		u8 i[2] = { reghi, reglo };
 		u8 o[1] = {};
 		struct i2c_msg msg[] = {
@@ -2144,7 +2142,7 @@ init_i2c_long_if(struct nvbios_init *init)
 		};
 		int ret;
 
-		ret = i2c_transfer(&port->adapter, msg, 2);
+		ret = i2c_transfer(adap, msg, 2);
 		if (ret == 2 && ((o[0] & mask) == data))
 			return;
 	}
diff --git a/drm/nouveau/nvkm/subdev/i2c/Kbuild b/drm/nouveau/nvkm/subdev/i2c/Kbuild
index d6830740..200f996f 100644
--- a/drm/nouveau/nvkm/subdev/i2c/Kbuild
+++ b/drm/nouveau/nvkm/subdev/i2c/Kbuild
@@ -1,11 +1,4 @@
 nvkm-y += nvkm/subdev/i2c/base.o
-nvkm-y += nvkm/subdev/i2c/anx9805.o
-nvkm-y += nvkm/subdev/i2c/aux.o
-nvkm-y += nvkm/subdev/i2c/bit.o
-nvkm-y += nvkm/subdev/i2c/pad.o
-nvkm-y += nvkm/subdev/i2c/padnv04.o
-nvkm-y += nvkm/subdev/i2c/padg94.o
-nvkm-y += nvkm/subdev/i2c/padgm204.o
 nvkm-y += nvkm/subdev/i2c/nv04.o
 nvkm-y += nvkm/subdev/i2c/nv4e.o
 nvkm-y += nvkm/subdev/i2c/nv50.o
@@ -14,3 +7,24 @@ nvkm-y += nvkm/subdev/i2c/gf110.o
 nvkm-y += nvkm/subdev/i2c/gf117.o
 nvkm-y += nvkm/subdev/i2c/gk104.o
 nvkm-y += nvkm/subdev/i2c/gm204.o
+
+nvkm-y += nvkm/subdev/i2c/pad.o
+nvkm-y += nvkm/subdev/i2c/padnv04.o
+nvkm-y += nvkm/subdev/i2c/padnv4e.o
+nvkm-y += nvkm/subdev/i2c/padnv50.o
+nvkm-y += nvkm/subdev/i2c/padg94.o
+nvkm-y += nvkm/subdev/i2c/padgf119.o
+nvkm-y += nvkm/subdev/i2c/padgm204.o
+
+nvkm-y += nvkm/subdev/i2c/bus.o
+nvkm-y += nvkm/subdev/i2c/busnv04.o
+nvkm-y += nvkm/subdev/i2c/busnv4e.o
+nvkm-y += nvkm/subdev/i2c/busnv50.o
+nvkm-y += nvkm/subdev/i2c/busgf119.o
+nvkm-y += nvkm/subdev/i2c/bit.o
+
+nvkm-y += nvkm/subdev/i2c/aux.o
+nvkm-y += nvkm/subdev/i2c/auxg94.o
+nvkm-y += nvkm/subdev/i2c/auxgm204.o
+
+nvkm-y += nvkm/subdev/i2c/anx9805.o
diff --git a/drm/nouveau/nvkm/subdev/i2c/anx9805.c b/drm/nouveau/nvkm/subdev/i2c/anx9805.c
index 7b195393..b7b01c3f 100644
--- a/drm/nouveau/nvkm/subdev/i2c/anx9805.c
+++ b/drm/nouveau/nvkm/subdev/i2c/anx9805.c
@@ -21,274 +21,258 @@
  *
  * Authors: Ben Skeggs <bskeggs@redhat.com>
  */
-#include "port.h"
+#define anx9805_pad(p) container_of((p), struct anx9805_pad, base)
+#define anx9805_bus(p) container_of((p), struct anx9805_bus, base)
+#define anx9805_aux(p) container_of((p), struct anx9805_aux, base)
+#include "aux.h"
+#include "bus.h"
+
+struct anx9805_pad {
+	struct nvkm_i2c_pad base;
+	struct nvkm_i2c_bus *bus;
+	u8 addr;
+};
 
-struct anx9805_i2c_port {
-	struct nvkm_i2c_port base;
-	u32 addr;
-	u32 ctrl;
+struct anx9805_bus {
+	struct nvkm_i2c_bus base;
+	struct anx9805_pad *pad;
+	u8 addr;
 };
 
 static int
-anx9805_train(struct nvkm_i2c_port *port, int link_nr, int link_bw, bool enh)
+anx9805_bus_xfer(struct nvkm_i2c_bus *base, struct i2c_msg *msgs, int num)
 {
-	struct nvkm_i2c *i2c = nvkm_i2c(port);
-	struct nvkm_subdev *subdev = &i2c->subdev;
-	struct anx9805_i2c_port *chan = (void *)port;
-	struct nvkm_i2c_port *mast = (void *)nv_object(chan)->parent;
-	u8 tmp, i;
-
-	DBG("ANX9805 train %d %02x %d\n", link_nr, link_bw, enh);
+	struct anx9805_bus *bus = anx9805_bus(base);
+	struct anx9805_pad *pad = bus->pad;
+	struct i2c_adapter *adap = &pad->bus->i2c;
+	struct i2c_msg *msg = msgs;
+	int ret = -ETIMEDOUT;
+	int i, j, cnt = num;
+	u8 seg = 0x00, off = 0x00, tmp;
 
-	nv_wri2cr(mast, chan->addr, 0xa0, link_bw);
-	nv_wri2cr(mast, chan->addr, 0xa1, link_nr | (enh ? 0x80 : 0x00));
-	nv_wri2cr(mast, chan->addr, 0xa2, 0x01);
-	nv_wri2cr(mast, chan->addr, 0xa8, 0x01);
+	tmp = nvkm_rdi2cr(adap, pad->addr, 0x07) & ~0x10;
+	nvkm_wri2cr(adap, pad->addr, 0x07, tmp | 0x10);
+	nvkm_wri2cr(adap, pad->addr, 0x07, tmp);
+	nvkm_wri2cr(adap, bus->addr, 0x43, 0x05);
+	mdelay(5);
 
-	i = 0;
-	while ((tmp = nv_rdi2cr(mast, chan->addr, 0xa8)) & 0x01) {
-		mdelay(5);
-		if (i++ == 100) {
-			nvkm_error(subdev, "link training timed out\n");
-			return -ETIMEDOUT;
+	while (cnt--) {
+		if ( (msg->flags & I2C_M_RD) && msg->addr == 0x50) {
+			nvkm_wri2cr(adap, bus->addr, 0x40, msg->addr << 1);
+			nvkm_wri2cr(adap, bus->addr, 0x41, seg);
+			nvkm_wri2cr(adap, bus->addr, 0x42, off);
+			nvkm_wri2cr(adap, bus->addr, 0x44, msg->len);
+			nvkm_wri2cr(adap, bus->addr, 0x45, 0x00);
+			nvkm_wri2cr(adap, bus->addr, 0x43, 0x01);
+			for (i = 0; i < msg->len; i++) {
+				j = 0;
+				while (nvkm_rdi2cr(adap, bus->addr, 0x46) & 0x10) {
+					mdelay(5);
+					if (j++ == 32)
+						goto done;
+				}
+				msg->buf[i] = nvkm_rdi2cr(adap, bus->addr, 0x47);
+			}
+		} else
+		if (!(msg->flags & I2C_M_RD)) {
+			if (msg->addr == 0x50 && msg->len == 0x01) {
+				off = msg->buf[0];
+			} else
+			if (msg->addr == 0x30 && msg->len == 0x01) {
+				seg = msg->buf[0];
+			} else
+				goto done;
+		} else {
+			goto done;
 		}
+		msg++;
 	}
 
-	if (tmp & 0x70) {
-		nvkm_error(subdev, "link training failed: %02x\n", tmp);
-		return -EIO;
+	ret = num;
+done:
+	nvkm_wri2cr(adap, bus->addr, 0x43, 0x00);
+	return ret;
+}
+
+static const struct nvkm_i2c_bus_func
+anx9805_bus_func = {
+	.xfer = anx9805_bus_xfer,
+};
+
+static int
+anx9805_bus_new(struct nvkm_i2c_pad *base, int id, u8 drive,
+		struct nvkm_i2c_bus **pbus)
+{
+	struct anx9805_pad *pad = anx9805_pad(base);
+	struct anx9805_bus *bus;
+	int ret;
+
+	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
+		return -ENOMEM;
+	*pbus = &bus->base;
+	bus->pad = pad;
+
+	ret = nvkm_i2c_bus_ctor(&anx9805_bus_func, &pad->base, id, &bus->base);
+	if (ret)
+		return ret;
+
+	switch (pad->addr) {
+	case 0x39: bus->addr = 0x3d; break;
+	case 0x3b: bus->addr = 0x3f; break;
+	default:
+		return -ENOSYS;
 	}
 
-	return 1;
+	return 0;
 }
 
+struct anx9805_aux {
+	struct nvkm_i2c_aux base;
+	struct anx9805_pad *pad;
+	u8 addr;
+};
+
 static int
-anx9805_aux(struct nvkm_i2c_port *port, bool retry,
-	    u8 type, u32 addr, u8 *data, u8 size)
+anx9805_aux_xfer(struct nvkm_i2c_aux *base, bool retry,
+		 u8 type, u32 addr, u8 *data, u8 size)
 {
-	struct anx9805_i2c_port *chan = (void *)port;
-	struct nvkm_i2c_port *mast = (void *)nv_object(chan)->parent;
+	struct anx9805_aux *aux = anx9805_aux(base);
+	struct anx9805_pad *pad = aux->pad;
+	struct i2c_adapter *adap = &pad->bus->i2c;
 	int i, ret = -ETIMEDOUT;
 	u8 buf[16] = {};
 	u8 tmp;
 
-	DBG("%02x %05x %d\n", type, addr, size);
+	AUX_DBG(&aux->base, "%02x %05x %d", type, addr, size);
 
-	tmp = nv_rdi2cr(mast, chan->ctrl, 0x07) & ~0x04;
-	nv_wri2cr(mast, chan->ctrl, 0x07, tmp | 0x04);
-	nv_wri2cr(mast, chan->ctrl, 0x07, tmp);
-	nv_wri2cr(mast, chan->ctrl, 0xf7, 0x01);
+	tmp = nvkm_rdi2cr(adap, pad->addr, 0x07) & ~0x04;
+	nvkm_wri2cr(adap, pad->addr, 0x07, tmp | 0x04);
+	nvkm_wri2cr(adap, pad->addr, 0x07, tmp);
+	nvkm_wri2cr(adap, pad->addr, 0xf7, 0x01);
 
-	nv_wri2cr(mast, chan->addr, 0xe4, 0x80);
+	nvkm_wri2cr(adap, aux->addr, 0xe4, 0x80);
 	if (!(type & 1)) {
 		memcpy(buf, data, size);
-		DBG("%16ph", buf);
+		AUX_DBG(&aux->base, "%16ph", buf);
 		for (i = 0; i < size; i++)
-			nv_wri2cr(mast, chan->addr, 0xf0 + i, buf[i]);
+			nvkm_wri2cr(adap, aux->addr, 0xf0 + i, buf[i]);
 	}
-	nv_wri2cr(mast, chan->addr, 0xe5, ((size - 1) << 4) | type);
-	nv_wri2cr(mast, chan->addr, 0xe6, (addr & 0x000ff) >>  0);
-	nv_wri2cr(mast, chan->addr, 0xe7, (addr & 0x0ff00) >>  8);
-	nv_wri2cr(mast, chan->addr, 0xe8, (addr & 0xf0000) >> 16);
-	nv_wri2cr(mast, chan->addr, 0xe9, 0x01);
+	nvkm_wri2cr(adap, aux->addr, 0xe5, ((size - 1) << 4) | type);
+	nvkm_wri2cr(adap, aux->addr, 0xe6, (addr & 0x000ff) >>  0);
+	nvkm_wri2cr(adap, aux->addr, 0xe7, (addr & 0x0ff00) >>  8);
+	nvkm_wri2cr(adap, aux->addr, 0xe8, (addr & 0xf0000) >> 16);
+	nvkm_wri2cr(adap, aux->addr, 0xe9, 0x01);
 
 	i = 0;
-	while ((tmp = nv_rdi2cr(mast, chan->addr, 0xe9)) & 0x01) {
+	while ((tmp = nvkm_rdi2cr(adap, aux->addr, 0xe9)) & 0x01) {
 		mdelay(5);
 		if (i++ == 32)
 			goto done;
 	}
 
-	if ((tmp = nv_rdi2cr(mast, chan->ctrl, 0xf7)) & 0x01) {
+	if ((tmp = nvkm_rdi2cr(adap, pad->addr, 0xf7)) & 0x01) {
 		ret = -EIO;
 		goto done;
 	}
 
 	if (type & 1) {
 		for (i = 0; i < size; i++)
-			buf[i] = nv_rdi2cr(mast, chan->addr, 0xf0 + i);
-		DBG("%16ph", buf);
+			buf[i] = nvkm_rdi2cr(adap, aux->addr, 0xf0 + i);
+		AUX_DBG(&aux->base, "%16ph", buf);
 		memcpy(data, buf, size);
 	}
 
 	ret = 0;
 done:
-	nv_wri2cr(mast, chan->ctrl, 0xf7, 0x01);
+	nvkm_wri2cr(adap, pad->addr, 0xf7, 0x01);
 	return ret;
 }
 
-static const struct nvkm_i2c_func
-anx9805_aux_func = {
-	.aux = anx9805_aux,
-	.lnk_ctl = anx9805_train,
-};
-
 static int
-anx9805_aux_chan_ctor(struct nvkm_object *parent,
-		      struct nvkm_object *engine,
-		      struct nvkm_oclass *oclass, void *data, u32 index,
-		      struct nvkm_object **pobject)
+anx9805_aux_lnk_ctl(struct nvkm_i2c_aux *base,
+		    int link_nr, int link_bw, bool enh)
 {
-	struct nvkm_i2c_port *mast = (void *)parent;
-	struct anx9805_i2c_port *chan;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_aux_algo, &anx9805_aux_func,
-				   &chan);
-	*pobject = nv_object(chan);
-	if (ret)
-		return ret;
-
-	switch ((oclass->handle & 0xff00) >> 8) {
-	case 0x0d:
-		chan->addr = 0x38;
-		chan->ctrl = 0x39;
-		break;
-	case 0x0e:
-		chan->addr = 0x3c;
-		chan->ctrl = 0x3b;
-		break;
-	default:
-		BUG_ON(1);
-	}
-
-	if (mast->adapter.algo == &i2c_bit_algo) {
-		struct i2c_algo_bit_data *algo = mast->adapter.algo_data;
-		algo->udelay = max(algo->udelay, 40);
-	}
-
-	return 0;
-}
-
-static struct nvkm_ofuncs
-anx9805_aux_ofuncs = {
-	.ctor =  anx9805_aux_chan_ctor,
-	.dtor = _nvkm_i2c_port_dtor,
-	.init = _nvkm_i2c_port_init,
-	.fini = _nvkm_i2c_port_fini,
-};
+	struct anx9805_aux *aux = anx9805_aux(base);
+	struct anx9805_pad *pad = aux->pad;
+	struct i2c_adapter *adap = &pad->bus->i2c;
+	u8 tmp, i;
 
-static int
-anx9805_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
-{
-	struct anx9805_i2c_port *port = adap->algo_data;
-	struct nvkm_i2c_port *mast = (void *)nv_object(port)->parent;
-	struct i2c_msg *msg = msgs;
-	int ret = -ETIMEDOUT;
-	int i, j, cnt = num;
-	u8 seg = 0x00, off = 0x00, tmp;
+	AUX_DBG(&aux->base, "ANX9805 train %d %02x %d",
+		link_nr, link_bw, enh);
 
-	tmp = nv_rdi2cr(mast, port->ctrl, 0x07) & ~0x10;
-	nv_wri2cr(mast, port->ctrl, 0x07, tmp | 0x10);
-	nv_wri2cr(mast, port->ctrl, 0x07, tmp);
-	nv_wri2cr(mast, port->addr, 0x43, 0x05);
-	mdelay(5);
+	nvkm_wri2cr(adap, aux->addr, 0xa0, link_bw);
+	nvkm_wri2cr(adap, aux->addr, 0xa1, link_nr | (enh ? 0x80 : 0x00));
+	nvkm_wri2cr(adap, aux->addr, 0xa2, 0x01);
+	nvkm_wri2cr(adap, aux->addr, 0xa8, 0x01);
 
-	while (cnt--) {
-		if ( (msg->flags & I2C_M_RD) && msg->addr == 0x50) {
-			nv_wri2cr(mast, port->addr, 0x40, msg->addr << 1);
-			nv_wri2cr(mast, port->addr, 0x41, seg);
-			nv_wri2cr(mast, port->addr, 0x42, off);
-			nv_wri2cr(mast, port->addr, 0x44, msg->len);
-			nv_wri2cr(mast, port->addr, 0x45, 0x00);
-			nv_wri2cr(mast, port->addr, 0x43, 0x01);
-			for (i = 0; i < msg->len; i++) {
-				j = 0;
-				while (nv_rdi2cr(mast, port->addr, 0x46) & 0x10) {
-					mdelay(5);
-					if (j++ == 32)
-						goto done;
-				}
-				msg->buf[i] = nv_rdi2cr(mast, port->addr, 0x47);
-			}
-		} else
-		if (!(msg->flags & I2C_M_RD)) {
-			if (msg->addr == 0x50 && msg->len == 0x01) {
-				off = msg->buf[0];
-			} else
-			if (msg->addr == 0x30 && msg->len == 0x01) {
-				seg = msg->buf[0];
-			} else
-				goto done;
-		} else {
-			goto done;
+	i = 0;
+	while ((tmp = nvkm_rdi2cr(adap, aux->addr, 0xa8)) & 0x01) {
+		mdelay(5);
+		if (i++ == 100) {
+			AUX_ERR(&aux->base, "link training timeout");
+			return -ETIMEDOUT;
 		}
-		msg++;
 	}
 
-	ret = num;
-done:
-	nv_wri2cr(mast, port->addr, 0x43, 0x00);
-	return ret;
-}
+	if (tmp & 0x70) {
+		AUX_ERR(&aux->base, "link training failed");
+		return -EIO;
+	}
 
-static u32
-anx9805_func(struct i2c_adapter *adap)
-{
-	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+	return 0;
 }
 
-static const struct i2c_algorithm
-anx9805_i2c_algo = {
-	.master_xfer = anx9805_xfer,
-	.functionality = anx9805_func
-};
-
-static const struct nvkm_i2c_func
-anx9805_i2c_func = {
+static const struct nvkm_i2c_aux_func
+anx9805_aux_func = {
+	.xfer = anx9805_aux_xfer,
+	.lnk_ctl = anx9805_aux_lnk_ctl,
 };
 
 static int
-anx9805_ddc_port_ctor(struct nvkm_object *parent,
-		      struct nvkm_object *engine,
-		      struct nvkm_oclass *oclass, void *data, u32 index,
-		      struct nvkm_object **pobject)
+anx9805_aux_new(struct nvkm_i2c_pad *base, int id, u8 drive,
+		struct nvkm_i2c_aux **pbus)
 {
-	struct nvkm_i2c_port *mast = (void *)parent;
-	struct anx9805_i2c_port *port;
+	struct anx9805_pad *pad = anx9805_pad(base);
+	struct anx9805_aux *aux;
 	int ret;
 
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &anx9805_i2c_algo, &anx9805_i2c_func, &port);
-	*pobject = nv_object(port);
+	if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL)))
+		return -ENOMEM;
+	*pbus = &aux->base;
+	aux->pad = pad;
+
+	ret = nvkm_i2c_aux_ctor(&anx9805_aux_func, &pad->base, id, &aux->base);
 	if (ret)
 		return ret;
 
-	switch ((oclass->handle & 0xff00) >> 8) {
-	case 0x0d:
-		port->addr = 0x3d;
-		port->ctrl = 0x39;
-		break;
-	case 0x0e:
-		port->addr = 0x3f;
-		port->ctrl = 0x3b;
-		break;
+	switch (pad->addr) {
+	case 0x39: aux->addr = 0x38; break;
+	case 0x3b: aux->addr = 0x3c; break;
 	default:
-		BUG_ON(1);
-	}
-
-	if (mast->adapter.algo == &i2c_bit_algo) {
-		struct i2c_algo_bit_data *algo = mast->adapter.algo_data;
-		algo->udelay = max(algo->udelay, 40);
+		return -ENOSYS;
 	}
 
 	return 0;
 }
 
-static struct nvkm_ofuncs
-anx9805_ddc_ofuncs = {
-	.ctor =  anx9805_ddc_port_ctor,
-	.dtor = _nvkm_i2c_port_dtor,
-	.init = _nvkm_i2c_port_init,
-	.fini = _nvkm_i2c_port_fini,
+static const struct nvkm_i2c_pad_func
+anx9805_pad_func = {
+	.bus_new_4 = anx9805_bus_new,
+	.aux_new_6 = anx9805_aux_new,
 };
 
-struct nvkm_oclass
-nvkm_anx9805_sclass[] = {
-	{ .handle = NV_I2C_TYPE_EXTDDC(0x0d), .ofuncs = &anx9805_ddc_ofuncs },
-	{ .handle = NV_I2C_TYPE_EXTAUX(0x0d), .ofuncs = &anx9805_aux_ofuncs },
-	{ .handle = NV_I2C_TYPE_EXTDDC(0x0e), .ofuncs = &anx9805_ddc_ofuncs },
-	{ .handle = NV_I2C_TYPE_EXTAUX(0x0e), .ofuncs = &anx9805_aux_ofuncs },
-	{}
-};
+int
+anx9805_pad_new(struct nvkm_i2c_bus *bus, int id, u8 addr,
+		struct nvkm_i2c_pad **ppad)
+{
+	struct anx9805_pad *pad;
+
+	if (!(pad = kzalloc(sizeof(*pad), GFP_KERNEL)))
+		return -ENOMEM;
+	*ppad = &pad->base;
+
+	nvkm_i2c_pad_ctor(&anx9805_pad_func, bus->pad->i2c, id, &pad->base);
+	pad->bus = bus;
+	pad->addr = addr;
+	return 0;
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/aux.c b/drm/nouveau/nvkm/subdev/i2c/aux.c
index 1c18860f..f0851d57 100644
--- a/drm/nouveau/nvkm/subdev/i2c/aux.c
+++ b/drm/nouveau/nvkm/subdev/i2c/aux.c
@@ -21,50 +21,17 @@
  *
  * Authors: Ben Skeggs
  */
-#include "priv.h"
-
-int
-nv_rdaux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
-{
-	struct nvkm_i2c *i2c = nvkm_i2c(port);
-	if (port->func->aux) {
-		int ret = i2c->acquire(port, 0);
-		if (ret == 0) {
-			ret = port->func->aux(port, true, 9, addr, data, size);
-			i2c->release(port);
-		}
-		return ret;
-	}
-	return -ENODEV;
-}
-
-int
-nv_wraux(struct nvkm_i2c_port *port, u32 addr, u8 *data, u8 size)
-{
-	struct nvkm_i2c *i2c = nvkm_i2c(port);
-	if (port->func->aux) {
-		int ret = i2c->acquire(port, 0);
-		if (ret == 0) {
-			ret = port->func->aux(port, true, 8, addr, data, size);
-			i2c->release(port);
-		}
-		return ret;
-	}
-	return -ENODEV;
-}
+#include "aux.h"
+#include "pad.h"
 
 static int
-aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+nvkm_i2c_aux_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 {
-	struct nvkm_i2c_port *port = adap->algo_data;
-	struct nvkm_i2c *i2c = nvkm_i2c(port);
+	struct nvkm_i2c_aux *aux = container_of(adap, typeof(*aux), i2c);
 	struct i2c_msg *msg = msgs;
 	int ret, mcnt = num;
 
-	if (!port->func->aux)
-		return -ENODEV;
-
-	ret = i2c->acquire(port, 0);
+	ret = nvkm_i2c_aux_acquire(aux);
 	if (ret)
 		return ret;
 
@@ -84,9 +51,9 @@ aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 			if (mcnt || remaining > 16)
 				cmd |= 4; /* MOT */
 
-			ret = port->func->aux(port, true, cmd, msg->addr, ptr, cnt);
+			ret = aux->func->xfer(aux, true, cmd, msg->addr, ptr, cnt);
 			if (ret < 0) {
-				i2c->release(port);
+				nvkm_i2c_aux_release(aux);
 				return ret;
 			}
 
@@ -97,17 +64,111 @@ aux_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 		msg++;
 	}
 
-	i2c->release(port);
+	nvkm_i2c_aux_release(aux);
 	return num;
 }
 
 static u32
-aux_func(struct i2c_adapter *adap)
+nvkm_i2c_aux_i2c_func(struct i2c_adapter *adap)
 {
 	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 }
 
-const struct i2c_algorithm nvkm_i2c_aux_algo = {
-	.master_xfer = aux_xfer,
-	.functionality = aux_func
+const struct i2c_algorithm
+nvkm_i2c_aux_i2c_algo = {
+	.master_xfer = nvkm_i2c_aux_i2c_xfer,
+	.functionality = nvkm_i2c_aux_i2c_func
 };
+
+void
+nvkm_i2c_aux_monitor(struct nvkm_i2c_aux *aux, bool monitor)
+{
+	struct nvkm_i2c_pad *pad = aux->pad;
+	AUX_TRACE(aux, "monitor: %s", monitor ? "yes" : "no");
+	if (monitor)
+		nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_AUX);
+	else
+		nvkm_i2c_pad_mode(pad, NVKM_I2C_PAD_OFF);
+}
+
+void
+nvkm_i2c_aux_release(struct nvkm_i2c_aux *aux)
+{
+	struct nvkm_i2c_pad *pad = aux->pad;
+	AUX_TRACE(aux, "release");
+	nvkm_i2c_pad_release(pad);
+	mutex_unlock(&aux->mutex);
+}
+
+int
+nvkm_i2c_aux_acquire(struct nvkm_i2c_aux *aux)
+{
+	struct nvkm_i2c_pad *pad = aux->pad;
+	int ret;
+	AUX_TRACE(aux, "acquire");
+	mutex_lock(&aux->mutex);
+	ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_AUX);
+	if (ret)
+		mutex_unlock(&aux->mutex);
+	return ret;
+}
+
+int
+nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *aux, bool retry, u8 type,
+		  u32 addr, u8 *data, u8 size)
+{
+	return aux->func->xfer(aux, retry, type, addr, data, size);
+}
+
+int
+nvkm_i2c_aux_lnk_ctl(struct nvkm_i2c_aux *aux, int nr, int bw, bool ef)
+{
+	if (aux->func->lnk_ctl)
+		return aux->func->lnk_ctl(aux, nr, bw, ef);
+	return -ENODEV;
+}
+
+void
+nvkm_i2c_aux_del(struct nvkm_i2c_aux **paux)
+{
+	struct nvkm_i2c_aux *aux = *paux;
+	if (aux && !WARN_ON(!aux->func)) {
+		AUX_TRACE(aux, "dtor");
+		list_del(&aux->head);
+		i2c_del_adapter(&aux->i2c);
+		kfree(*paux);
+		*paux = NULL;
+	}
+}
+
+int
+nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *func,
+		  struct nvkm_i2c_pad *pad, int id,
+		  struct nvkm_i2c_aux *aux)
+{
+	struct nvkm_device *device = pad->i2c->subdev.device;
+
+	aux->func = func;
+	aux->pad = pad;
+	aux->id = id;
+	mutex_init(&aux->mutex);
+	list_add_tail(&aux->head, &pad->i2c->aux);
+	AUX_TRACE(aux, "ctor");
+
+	snprintf(aux->i2c.name, sizeof(aux->i2c.name), "nvkm-%s-aux-%04x",
+		 dev_name(device->dev), id);
+	aux->i2c.owner = THIS_MODULE;
+	aux->i2c.dev.parent = device->dev;
+	aux->i2c.algo = &nvkm_i2c_aux_i2c_algo;
+	return i2c_add_adapter(&aux->i2c);
+}
+
+int
+nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *func,
+		  struct nvkm_i2c_pad *pad, int id,
+		  struct nvkm_i2c_aux **paux)
+{
+	if (!(*paux = kzalloc(sizeof(**paux), GFP_KERNEL)))
+		return -ENOMEM;
+	return nvkm_i2c_aux_ctor(func, pad, id, *paux);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/aux.h b/drm/nouveau/nvkm/subdev/i2c/aux.h
new file mode 100644
index 00000000..35a892e4
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/aux.h
@@ -0,0 +1,30 @@
+#ifndef __NVKM_I2C_AUX_H__
+#define __NVKM_I2C_AUX_H__
+#include "pad.h"
+
+struct nvkm_i2c_aux_func {
+	int  (*xfer)(struct nvkm_i2c_aux *, bool retry, u8 type,
+		     u32 addr, u8 *data, u8 size);
+	int  (*lnk_ctl)(struct nvkm_i2c_aux *, int link_nr, int link_bw,
+			bool enhanced_framing);
+};
+
+int nvkm_i2c_aux_ctor(const struct nvkm_i2c_aux_func *, struct nvkm_i2c_pad *,
+		      int id, struct nvkm_i2c_aux *);
+int nvkm_i2c_aux_new_(const struct nvkm_i2c_aux_func *, struct nvkm_i2c_pad *,
+		      int id, struct nvkm_i2c_aux **);
+void nvkm_i2c_aux_del(struct nvkm_i2c_aux **);
+int nvkm_i2c_aux_xfer(struct nvkm_i2c_aux *, bool retry, u8 type,
+		      u32 addr, u8 *data, u8 size);
+
+int g94_i2c_aux_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_aux **);
+int gm204_i2c_aux_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_aux **);
+
+#define AUX_MSG(b,l,f,a...) do {                                               \
+	struct nvkm_i2c_aux *_aux = (b);                                       \
+	nvkm_##l(&_aux->pad->i2c->subdev, "aux %04x: "f"\n", _aux->id, ##a);   \
+} while(0)
+#define AUX_ERR(b,f,a...) AUX_MSG((b), error, f, ##a)
+#define AUX_DBG(b,f,a...) AUX_MSG((b), debug, f, ##a)
+#define AUX_TRACE(b,f,a...) AUX_MSG((b), trace, f, ##a)
+#endif
diff --git a/drm/nouveau/nvkm/subdev/i2c/auxg94.c b/drm/nouveau/nvkm/subdev/i2c/auxg94.c
new file mode 100644
index 00000000..954f5b76
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/auxg94.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial busions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#define g94_i2c_aux(p) container_of((p), struct g94_i2c_aux, base)
+#include "aux.h"
+
+struct g94_i2c_aux {
+	struct nvkm_i2c_aux base;
+	int ch;
+};
+
+static void
+g94_i2c_aux_fini(struct g94_i2c_aux *aux)
+{
+	struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
+	nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00310000, 0x00000000);
+}
+
+static int
+g94_i2c_aux_init(struct g94_i2c_aux *aux)
+{
+	struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
+	const u32 unksel = 1; /* nfi which to use, or if it matters.. */
+	const u32 ureq = unksel ? 0x00100000 : 0x00200000;
+	const u32 urep = unksel ? 0x01000000 : 0x02000000;
+	u32 ctrl, timeout;
+
+	/* wait up to 1ms for any previous transaction to be done... */
+	timeout = 1000;
+	do {
+		ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50));
+		udelay(1);
+		if (!timeout--) {
+			AUX_ERR(&aux->base, "begin idle timeout %08x", ctrl);
+			return -EBUSY;
+		}
+	} while (ctrl & 0x03010000);
+
+	/* set some magic, and wait up to 1ms for it to appear */
+	nvkm_mask(device, 0x00e4e4 + (aux->ch * 0x50), 0x00300000, ureq);
+	timeout = 1000;
+	do {
+		ctrl = nvkm_rd32(device, 0x00e4e4 + (aux->ch * 0x50));
+		udelay(1);
+		if (!timeout--) {
+			AUX_ERR(&aux->base, "magic wait %08x", ctrl);
+			g94_i2c_aux_fini(aux);
+			return -EBUSY;
+		}
+	} while ((ctrl & 0x03000000) != urep);
+
+	return 0;
+}
+
+static int
+g94_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry,
+		 u8 type, u32 addr, u8 *data, u8 size)
+{
+	struct g94_i2c_aux *aux = g94_i2c_aux(obj);
+	struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
+	const u32 base = aux->ch * 0x50;
+	u32 ctrl, stat, timeout, retries;
+	u32 xbuf[4] = {};
+	int ret, i;
+
+	AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, size);
+
+	ret = g94_i2c_aux_init(aux);
+	if (ret < 0)
+		goto out;
+
+	stat = nvkm_rd32(device, 0x00e4e8 + base);
+	if (!(stat & 0x10000000)) {
+		AUX_TRACE(&aux->base, "sink not detected");
+		ret = -ENXIO;
+		goto out;
+	}
+
+	if (!(type & 1)) {
+		memcpy(xbuf, data, size);
+		for (i = 0; i < 16; i += 4) {
+			AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]);
+			nvkm_wr32(device, 0x00e4c0 + base + i, xbuf[i / 4]);
+		}
+	}
+
+	ctrl  = nvkm_rd32(device, 0x00e4e4 + base);
+	ctrl &= ~0x0001f0ff;
+	ctrl |= type << 12;
+	ctrl |= size - 1;
+	nvkm_wr32(device, 0x00e4e0 + base, addr);
+
+	/* (maybe) retry transaction a number of times on failure... */
+	for (retries = 0; !ret && retries < 32; retries++) {
+		/* reset, and delay a while if this is a retry */
+		nvkm_wr32(device, 0x00e4e4 + base, 0x80000000 | ctrl);
+		nvkm_wr32(device, 0x00e4e4 + base, 0x00000000 | ctrl);
+		if (retries)
+			udelay(400);
+
+		/* transaction request, wait up to 1ms for it to complete */
+		nvkm_wr32(device, 0x00e4e4 + base, 0x00010000 | ctrl);
+
+		timeout = 1000;
+		do {
+			ctrl = nvkm_rd32(device, 0x00e4e4 + base);
+			udelay(1);
+			if (!timeout--) {
+				AUX_ERR(&aux->base, "timeout %08x", ctrl);
+				ret = -EIO;
+				goto out;
+			}
+		} while (ctrl & 0x00010000);
+		ret = 1;
+
+		/* read status, and check if transaction completed ok */
+		stat = nvkm_mask(device, 0x00e4e8 + base, 0, 0);
+		if ((stat & 0x000f0000) == 0x00080000 ||
+		    (stat & 0x000f0000) == 0x00020000)
+			ret = retry ? 0 : 1;
+		if ((stat & 0x00000100))
+			ret = -ETIMEDOUT;
+		if ((stat & 0x00000e00))
+			ret = -EIO;
+
+		AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat);
+	}
+
+	if (type & 1) {
+		for (i = 0; i < 16; i += 4) {
+			xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + base + i);
+			AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);
+		}
+		memcpy(data, xbuf, size);
+	}
+
+out:
+	g94_i2c_aux_fini(aux);
+	return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
+}
+
+static const struct nvkm_i2c_aux_func
+g94_i2c_aux_func = {
+	.xfer = g94_i2c_aux_xfer,
+};
+
+int
+g94_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive,
+		struct nvkm_i2c_aux **paux)
+{
+	struct g94_i2c_aux *aux;
+
+	if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL)))
+		return -ENOMEM;
+	*paux = &aux->base;
+
+	nvkm_i2c_aux_ctor(&g94_i2c_aux_func, pad, index, &aux->base);
+	aux->ch = drive;
+	aux->base.intr = 1 << aux->ch;
+	return 0;
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/auxgm204.c b/drm/nouveau/nvkm/subdev/i2c/auxgm204.c
new file mode 100644
index 00000000..bed231b5
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/auxgm204.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial busions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#define gm204_i2c_aux(p) container_of((p), struct gm204_i2c_aux, base)
+#include "aux.h"
+
+struct gm204_i2c_aux {
+	struct nvkm_i2c_aux base;
+	int ch;
+};
+
+static void
+gm204_i2c_aux_fini(struct gm204_i2c_aux *aux)
+{
+	struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
+	nvkm_mask(device, 0x00d954 + (aux->ch * 0x50), 0x00310000, 0x00000000);
+}
+
+static int
+gm204_i2c_aux_init(struct gm204_i2c_aux *aux)
+{
+	struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
+	const u32 unksel = 1; /* nfi which to use, or if it matters.. */
+	const u32 ureq = unksel ? 0x00100000 : 0x00200000;
+	const u32 urep = unksel ? 0x01000000 : 0x02000000;
+	u32 ctrl, timeout;
+
+	/* wait up to 1ms for any previous transaction to be done... */
+	timeout = 1000;
+	do {
+		ctrl = nvkm_rd32(device, 0x00d954 + (aux->ch * 0x50));
+		udelay(1);
+		if (!timeout--) {
+			AUX_ERR(&aux->base, "begin idle timeout %08x", ctrl);
+			return -EBUSY;
+		}
+	} while (ctrl & 0x03010000);
+
+	/* set some magic, and wait up to 1ms for it to appear */
+	nvkm_mask(device, 0x00d954 + (aux->ch * 0x50), 0x00300000, ureq);
+	timeout = 1000;
+	do {
+		ctrl = nvkm_rd32(device, 0x00d954 + (aux->ch * 0x50));
+		udelay(1);
+		if (!timeout--) {
+			AUX_ERR(&aux->base, "magic wait %08x", ctrl);
+			gm204_i2c_aux_fini(aux);
+			return -EBUSY;
+		}
+	} while ((ctrl & 0x03000000) != urep);
+
+	return 0;
+}
+
+static int
+gm204_i2c_aux_xfer(struct nvkm_i2c_aux *obj, bool retry,
+		   u8 type, u32 addr, u8 *data, u8 size)
+{
+	struct gm204_i2c_aux *aux = gm204_i2c_aux(obj);
+	struct nvkm_device *device = aux->base.pad->i2c->subdev.device;
+	const u32 base = aux->ch * 0x50;
+	u32 ctrl, stat, timeout, retries;
+	u32 xbuf[4] = {};
+	int ret, i;
+
+	AUX_TRACE(&aux->base, "%d: %08x %d", type, addr, size);
+
+	ret = gm204_i2c_aux_init(aux);
+	if (ret < 0)
+		goto out;
+
+	stat = nvkm_rd32(device, 0x00d958 + base);
+	if (!(stat & 0x10000000)) {
+		AUX_TRACE(&aux->base, "sink not detected");
+		ret = -ENXIO;
+		goto out;
+	}
+
+	if (!(type & 1)) {
+		memcpy(xbuf, data, size);
+		for (i = 0; i < 16; i += 4) {
+			AUX_TRACE(&aux->base, "wr %08x", xbuf[i / 4]);
+			nvkm_wr32(device, 0x00d930 + base + i, xbuf[i / 4]);
+		}
+	}
+
+	ctrl  = nvkm_rd32(device, 0x00d954 + base);
+	ctrl &= ~0x0001f0ff;
+	ctrl |= type << 12;
+	ctrl |= size - 1;
+	nvkm_wr32(device, 0x00d950 + base, addr);
+
+	/* (maybe) retry transaction a number of times on failure... */
+	for (retries = 0; !ret && retries < 32; retries++) {
+		/* reset, and delay a while if this is a retry */
+		nvkm_wr32(device, 0x00d954 + base, 0x80000000 | ctrl);
+		nvkm_wr32(device, 0x00d954 + base, 0x00000000 | ctrl);
+		if (retries)
+			udelay(400);
+
+		/* transaction request, wait up to 1ms for it to complete */
+		nvkm_wr32(device, 0x00d954 + base, 0x00010000 | ctrl);
+
+		timeout = 1000;
+		do {
+			ctrl = nvkm_rd32(device, 0x00d954 + base);
+			udelay(1);
+			if (!timeout--) {
+				AUX_ERR(&aux->base, "timeout %08x", ctrl);
+				ret = -EIO;
+				goto out;
+			}
+		} while (ctrl & 0x00010000);
+		ret = 1;
+
+		/* read status, and check if transaction completed ok */
+		stat = nvkm_mask(device, 0x00d958 + base, 0, 0);
+		if ((stat & 0x000f0000) == 0x00080000 ||
+		    (stat & 0x000f0000) == 0x00020000)
+			ret = retry ? 0 : 1;
+		if ((stat & 0x00000100))
+			ret = -ETIMEDOUT;
+		if ((stat & 0x00000e00))
+			ret = -EIO;
+
+		AUX_TRACE(&aux->base, "%02d %08x %08x", retries, ctrl, stat);
+	}
+
+	if (type & 1) {
+		for (i = 0; i < 16; i += 4) {
+			xbuf[i / 4] = nvkm_rd32(device, 0x00d940 + base + i);
+			AUX_TRACE(&aux->base, "rd %08x", xbuf[i / 4]);
+		}
+		memcpy(data, xbuf, size);
+	}
+
+out:
+	gm204_i2c_aux_fini(aux);
+	return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
+}
+
+static const struct nvkm_i2c_aux_func
+gm204_i2c_aux_func = {
+	.xfer = gm204_i2c_aux_xfer,
+};
+
+int
+gm204_i2c_aux_new(struct nvkm_i2c_pad *pad, int index, u8 drive,
+		struct nvkm_i2c_aux **paux)
+{
+	struct gm204_i2c_aux *aux;
+
+	if (!(aux = kzalloc(sizeof(*aux), GFP_KERNEL)))
+		return -ENOMEM;
+	*paux = &aux->base;
+
+	nvkm_i2c_aux_ctor(&gm204_i2c_aux_func, pad, index, &aux->base);
+	aux->ch = drive;
+	aux->base.intr = 1 << aux->ch;
+	return 0;
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/base.c b/drm/nouveau/nvkm/subdev/i2c/base.c
index 6b0f8f07..86bff984 100644
--- a/drm/nouveau/nvkm/subdev/i2c/base.c
+++ b/drm/nouveau/nvkm/subdev/i2c/base.c
@@ -22,330 +22,93 @@
  * Authors: Ben Skeggs
  */
 #include "priv.h"
+#include "aux.h"
+#include "bus.h"
 #include "pad.h"
 
 #include <core/notify.h>
 #include <core/option.h>
 #include <subdev/bios.h>
 #include <subdev/bios/dcb.h>
+#include <subdev/bios/i2c.h>
 
-/******************************************************************************
- * interface to linux i2c bit-banging algorithm
- *****************************************************************************/
-
-#ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
-#define CSTMSEL true
-#else
-#define CSTMSEL false
-#endif
-
-static int
-nvkm_i2c_pre_xfer(struct i2c_adapter *adap)
-{
-	struct i2c_algo_bit_data *bit = adap->algo_data;
-	struct nvkm_i2c_port *port = bit->data;
-	return nvkm_i2c(port)->acquire(port, bit->timeout);
-}
-
-static void
-nvkm_i2c_post_xfer(struct i2c_adapter *adap)
-{
-	struct i2c_algo_bit_data *bit = adap->algo_data;
-	struct nvkm_i2c_port *port = bit->data;
-	return nvkm_i2c(port)->release(port);
-}
-
-static void
-nvkm_i2c_setscl(void *data, int state)
-{
-	struct nvkm_i2c_port *port = data;
-	port->func->drive_scl(port, state);
-}
-
-static void
-nvkm_i2c_setsda(void *data, int state)
-{
-	struct nvkm_i2c_port *port = data;
-	port->func->drive_sda(port, state);
-}
-
-static int
-nvkm_i2c_getscl(void *data)
+static struct nvkm_i2c_pad *
+nvkm_i2c_pad_find(struct nvkm_i2c *i2c, int id)
 {
-	struct nvkm_i2c_port *port = data;
-	return port->func->sense_scl(port);
-}
-
-static int
-nvkm_i2c_getsda(void *data)
-{
-	struct nvkm_i2c_port *port = data;
-	return port->func->sense_sda(port);
-}
-
-/******************************************************************************
- * base i2c "port" class implementation
- *****************************************************************************/
-
-int
-_nvkm_i2c_port_fini(struct nvkm_object *object, bool suspend)
-{
-	struct nvkm_i2c_port *port = (void *)object;
-	struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port);
-	nv_ofuncs(pad)->fini(nv_object(pad), suspend);
-	return nvkm_object_fini(&port->base, suspend);
-}
-
-void
-_nvkm_i2c_port_dtor(struct nvkm_object *object)
-{
-	struct nvkm_i2c_port *port = (void *)object;
-	i2c_del_adapter(&port->adapter);
-	nvkm_object_destroy(&port->base);
-}
-
-int
-nvkm_i2c_port_create_(struct nvkm_object *parent, struct nvkm_object *engine,
-		      struct nvkm_oclass *oclass, u8 index,
-		      const struct i2c_algorithm *algo,
-		      const struct nvkm_i2c_func *func,
-		      int size, void **pobject)
-{
-	struct nvkm_device *device = nv_device(parent);
-	struct nvkm_i2c *i2c = nvkm_i2c(parent);
-	struct nvkm_i2c_port *port;
-	int ret;
+	struct nvkm_i2c_pad *pad;
 
-	ret = nvkm_object_create_(parent, engine, oclass, 0, size, pobject);
-	port = *pobject;
-	if (ret)
-		return ret;
-
-	snprintf(port->adapter.name, sizeof(port->adapter.name),
-		 "nvkm-%s-%d", device->name, index);
-	port->adapter.owner = THIS_MODULE;
-	port->adapter.dev.parent = nv_device_base(device);
-	port->index = index;
-	port->aux = -1;
-	port->func = func;
-	mutex_init(&port->mutex);
-
-	if ( algo == &nvkm_i2c_bit_algo &&
-	    !nvkm_boolopt(device->cfgopt, "NvI2C", CSTMSEL)) {
-		struct i2c_algo_bit_data *bit;
-
-		bit = kzalloc(sizeof(*bit), GFP_KERNEL);
-		if (!bit)
-			return -ENOMEM;
-
-		bit->udelay = 10;
-		bit->timeout = usecs_to_jiffies(2200);
-		bit->data = port;
-		bit->pre_xfer = nvkm_i2c_pre_xfer;
-		bit->post_xfer = nvkm_i2c_post_xfer;
-		bit->setsda = nvkm_i2c_setsda;
-		bit->setscl = nvkm_i2c_setscl;
-		bit->getsda = nvkm_i2c_getsda;
-		bit->getscl = nvkm_i2c_getscl;
-
-		port->adapter.algo_data = bit;
-		ret = i2c_bit_add_bus(&port->adapter);
-	} else {
-		port->adapter.algo_data = port;
-		port->adapter.algo = algo;
-		ret = i2c_add_adapter(&port->adapter);
+	list_for_each_entry(pad, &i2c->pad, head) {
+		if (pad->id == id)
+			return pad;
 	}
 
-	if (ret == 0)
-		list_add_tail(&port->head, &i2c->ports);
-	return ret;
+	return NULL;
 }
 
-/******************************************************************************
- * base i2c subdev class implementation
- *****************************************************************************/
-
-static struct nvkm_i2c_port *
-nvkm_i2c_find(struct nvkm_i2c *i2c, u8 index)
+struct nvkm_i2c_bus *
+nvkm_i2c_bus_find(struct nvkm_i2c *i2c, int id)
 {
-	struct nvkm_bios *bios = nvkm_bios(i2c);
-	struct nvkm_i2c_port *port;
+	struct nvkm_bios *bios = i2c->subdev.device->bios;
+	struct nvkm_i2c_bus *bus;
 
-	if (index == NV_I2C_DEFAULT(0) ||
-	    index == NV_I2C_DEFAULT(1)) {
+	if (id == NVKM_I2C_BUS_PRI || id == NVKM_I2C_BUS_SEC) {
 		u8  ver, hdr, cnt, len;
 		u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len);
 		if (i2c && ver >= 0x30) {
 			u8 auxidx = nvbios_rd08(bios, i2c + 4);
-			if (index == NV_I2C_DEFAULT(0))
-				index = (auxidx & 0x0f) >> 0;
+			if (id == NVKM_I2C_BUS_PRI)
+				id = NVKM_I2C_BUS_CCB((auxidx & 0x0f) >> 0);
 			else
-				index = (auxidx & 0xf0) >> 4;
+				id = NVKM_I2C_BUS_CCB((auxidx & 0xf0) >> 4);
 		} else {
-			index = 2;
+			id = NVKM_I2C_BUS_CCB(2);
 		}
 	}
 
-	list_for_each_entry(port, &i2c->ports, head) {
-		if (port->index == index)
-			return port;
+	list_for_each_entry(bus, &i2c->bus, head) {
+		if (bus->id == id)
+			return bus;
 	}
 
 	return NULL;
 }
 
-static struct nvkm_i2c_port *
-nvkm_i2c_find_type(struct nvkm_i2c *i2c, u16 type)
+struct nvkm_i2c_aux *
+nvkm_i2c_aux_find(struct nvkm_i2c *i2c, int id)
 {
-	struct nvkm_i2c_port *port;
+	struct nvkm_i2c_aux *aux;
 
-	list_for_each_entry(port, &i2c->ports, head) {
-		if (nv_hclass(port) == type)
-			return port;
+	list_for_each_entry(aux, &i2c->aux, head) {
+		if (aux->id == id)
+			return aux;
 	}
 
 	return NULL;
 }
 
 static void
-nvkm_i2c_release_pad(struct nvkm_i2c_port *port)
-{
-	struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port);
-	struct nvkm_i2c *i2c = nvkm_i2c(port);
-
-	if (atomic_dec_and_test(&nv_object(pad)->usecount)) {
-		nv_ofuncs(pad)->fini(nv_object(pad), false);
-		wake_up_all(&i2c->wait);
-	}
-}
-
-static int
-nvkm_i2c_try_acquire_pad(struct nvkm_i2c_port *port)
-{
-	struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port);
-
-	if (atomic_add_return(1, &nv_object(pad)->usecount) != 1) {
-		struct nvkm_object *owner = (void *)pad->port;
-		do {
-			if (owner == (void *)port)
-				return 0;
-			owner = owner->parent;
-		} while(owner);
-		nvkm_i2c_release_pad(port);
-		return -EBUSY;
-	}
-
-	pad->next = port;
-	nv_ofuncs(pad)->init(nv_object(pad));
-	return 0;
-}
-
-static int
-nvkm_i2c_acquire_pad(struct nvkm_i2c_port *port, unsigned long timeout)
-{
-	struct nvkm_i2c *i2c = nvkm_i2c(port);
-
-	if (timeout) {
-		if (wait_event_timeout(i2c->wait,
-				       nvkm_i2c_try_acquire_pad(port) == 0,
-				       timeout) == 0)
-			return -EBUSY;
-	} else {
-		wait_event(i2c->wait, nvkm_i2c_try_acquire_pad(port) == 0);
-	}
-
-	return 0;
-}
-
-static void
-nvkm_i2c_release(struct nvkm_i2c_port *port)
-__releases(pad->mutex)
-{
-	nvkm_i2c(port)->release_pad(port);
-	mutex_unlock(&port->mutex);
-}
-
-static int
-nvkm_i2c_acquire(struct nvkm_i2c_port *port, unsigned long timeout)
-__acquires(pad->mutex)
-{
-	int ret;
-	mutex_lock(&port->mutex);
-	if ((ret = nvkm_i2c(port)->acquire_pad(port, timeout)))
-		mutex_unlock(&port->mutex);
-	return ret;
-}
-
-static int
-nvkm_i2c_identify(struct nvkm_i2c *i2c, int index, const char *what,
-		  struct nvkm_i2c_board_info *info,
-		  bool (*match)(struct nvkm_i2c_port *,
-				struct i2c_board_info *, void *), void *data)
-{
-	struct nvkm_subdev *subdev = &i2c->subdev;
-	struct nvkm_i2c_port *port = nvkm_i2c_find(i2c, index);
-	int i;
-
-	if (!port) {
-		nvkm_debug(subdev, "no bus when probing %s on %d\n",
-			   what, index);
-		return -ENODEV;
-	}
-
-	nvkm_debug(subdev, "probing %ss on bus: %d\n", what, port->index);
-	for (i = 0; info[i].dev.addr; i++) {
-		u8 orig_udelay = 0;
-
-		if ((port->adapter.algo == &i2c_bit_algo) &&
-		    (info[i].udelay != 0)) {
-			struct i2c_algo_bit_data *algo = port->adapter.algo_data;
-			nvkm_debug(subdev,
-				   "using custom udelay %d instead of %d\n",
-				   info[i].udelay, algo->udelay);
-			orig_udelay = algo->udelay;
-			algo->udelay = info[i].udelay;
-		}
-
-		if (nv_probe_i2c(port, info[i].dev.addr) &&
-		    (!match || match(port, &info[i].dev, data))) {
-			nvkm_info(subdev, "detected %s: %s\n", what,
-				  info[i].dev.type);
-			return i;
-		}
-
-		if (orig_udelay) {
-			struct i2c_algo_bit_data *algo = port->adapter.algo_data;
-			algo->udelay = orig_udelay;
-		}
-	}
-
-	nvkm_debug(subdev, "no devices found.\n");
-	return -ENODEV;
-}
-
-static void
-nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int index)
+nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int id)
 {
 	struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
-	struct nvkm_i2c_port *port = i2c->find(i2c, index);
+	struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
 	const struct nvkm_i2c_impl *impl = (void *)nv_object(i2c)->oclass;
-	if (port && port->aux >= 0)
-		impl->aux_mask(i2c, type, 1 << port->aux, 0);
+	if (aux)
+		impl->aux_mask(i2c, type, aux->intr, 0);
 }
 
 static void
-nvkm_i2c_intr_init(struct nvkm_event *event, int type, int index)
+nvkm_i2c_intr_init(struct nvkm_event *event, int type, int id)
 {
 	struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event);
-	struct nvkm_i2c_port *port = i2c->find(i2c, index);
+	struct nvkm_i2c_aux *aux = nvkm_i2c_aux_find(i2c, id);
 	const struct nvkm_i2c_impl *impl = (void *)nv_object(i2c)->oclass;
-	if (port && port->aux >= 0)
-		impl->aux_mask(i2c, type, 1 << port->aux, 1 << port->aux);
+	if (aux)
+		impl->aux_mask(i2c, type, aux->intr, aux->intr);
 }
 
 static int
 nvkm_i2c_intr_ctor(struct nvkm_object *object, void *data, u32 size,
-		      struct nvkm_notify *notify)
+		   struct nvkm_notify *notify)
 {
 	struct nvkm_i2c_ntfy_req *req = data;
 	if (!WARN_ON(size != sizeof(*req))) {
@@ -358,33 +121,32 @@ nvkm_i2c_intr_ctor(struct nvkm_object *object, void *data, u32 size,
 }
 
 static void
-nvkm_i2c_intr(struct nvkm_subdev *subdev)
+nvkm_i2c_intr(struct nvkm_subdev *obj)
 {
-	struct nvkm_i2c_impl *impl = (void *)nv_oclass(subdev);
-	struct nvkm_i2c *i2c = nvkm_i2c(subdev);
-	struct nvkm_i2c_port *port;
-	u32 hi, lo, rq, tx, e;
-
-	if (impl->aux_stat) {
-		impl->aux_stat(i2c, &hi, &lo, &rq, &tx);
-		if (hi || lo || rq || tx) {
-			list_for_each_entry(port, &i2c->ports, head) {
-				if (e = 0, port->aux < 0)
-					continue;
-
-				if (hi & (1 << port->aux)) e |= NVKM_I2C_PLUG;
-				if (lo & (1 << port->aux)) e |= NVKM_I2C_UNPLUG;
-				if (rq & (1 << port->aux)) e |= NVKM_I2C_IRQ;
-				if (tx & (1 << port->aux)) e |= NVKM_I2C_DONE;
-				if (e) {
-					struct nvkm_i2c_ntfy_rep rep = {
-						.mask = e,
-					};
-					nvkm_event_send(&i2c->event, rep.mask,
-							port->index, &rep,
-							sizeof(rep));
-				}
-			}
+	struct nvkm_i2c *i2c = container_of(obj, typeof(*i2c), subdev);
+	struct nvkm_i2c_impl *impl = (void *)i2c->subdev.object.oclass;
+	struct nvkm_i2c_aux *aux;
+	u32 hi, lo, rq, tx;
+
+	if (!impl->aux_stat)
+		return;
+
+	impl->aux_stat(i2c, &hi, &lo, &rq, &tx);
+	if (!hi && !lo && !rq && !tx)
+		return;
+
+	list_for_each_entry(aux, &i2c->aux, head) {
+		u32 mask = 0;
+		if (hi & aux->intr) mask |= NVKM_I2C_PLUG;
+		if (lo & aux->intr) mask |= NVKM_I2C_UNPLUG;
+		if (rq & aux->intr) mask |= NVKM_I2C_IRQ;
+		if (tx & aux->intr) mask |= NVKM_I2C_DONE;
+		if (mask) {
+			struct nvkm_i2c_ntfy_rep rep = {
+				.mask = mask,
+			};
+			nvkm_event_send(&i2c->event, rep.mask, aux->id,
+					&rep, sizeof(rep));
 		}
 	}
 }
@@ -401,206 +163,241 @@ _nvkm_i2c_fini(struct nvkm_object *object, bool suspend)
 {
 	struct nvkm_i2c_impl *impl = (void *)nv_oclass(object);
 	struct nvkm_i2c *i2c = (void *)object;
-	struct nvkm_i2c_port *port;
+	struct nvkm_i2c_pad *pad;
 	u32 mask;
-	int ret;
-
-	list_for_each_entry(port, &i2c->ports, head) {
-		ret = nv_ofuncs(port)->fini(nv_object(port), suspend);
-		if (ret && suspend)
-			goto fail;
-	}
 
 	if ((mask = (1 << impl->aux) - 1), impl->aux_stat) {
 		impl->aux_mask(i2c, NVKM_I2C_ANY, mask, 0);
 		impl->aux_stat(i2c, &mask, &mask, &mask, &mask);
 	}
 
-	return nvkm_subdev_fini(&i2c->subdev, suspend);
-fail:
-	list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
-		nv_ofuncs(port)->init(nv_object(port));
+	list_for_each_entry(pad, &i2c->pad, head) {
+		nvkm_i2c_pad_fini(pad);
 	}
 
-	return ret;
+	return nvkm_subdev_fini(&i2c->subdev, suspend);
 }
 
 int
 _nvkm_i2c_init(struct nvkm_object *object)
 {
 	struct nvkm_i2c *i2c = (void *)object;
-	struct nvkm_i2c_port *port;
+	struct nvkm_i2c_bus *bus;
+	struct nvkm_i2c_pad *pad;
 	int ret;
 
 	ret = nvkm_subdev_init(&i2c->subdev);
-	if (ret == 0) {
-		list_for_each_entry(port, &i2c->ports, head) {
-			ret = nv_ofuncs(port)->init(nv_object(port));
-			if (ret)
-				goto fail;
-		}
+	if (ret)
+		return ret;
+
+	list_for_each_entry(pad, &i2c->pad, head) {
+		nvkm_i2c_pad_init(pad);
 	}
 
-	return ret;
-fail:
-	list_for_each_entry_continue_reverse(port, &i2c->ports, head) {
-		nv_ofuncs(port)->fini(nv_object(port), false);
+	list_for_each_entry(bus, &i2c->bus, head) {
+		nvkm_i2c_bus_init(bus);
 	}
 
-	return ret;
+	return 0;
 }
 
 void
 _nvkm_i2c_dtor(struct nvkm_object *object)
 {
 	struct nvkm_i2c *i2c = (void *)object;
-	struct nvkm_i2c_port *port, *temp;
 
 	nvkm_event_fini(&i2c->event);
 
-	list_for_each_entry_safe(port, temp, &i2c->ports, head) {
-		nvkm_object_ref(NULL, (struct nvkm_object **)&port);
+	while (!list_empty(&i2c->aux)) {
+		struct nvkm_i2c_aux *aux =
+			list_first_entry(&i2c->aux, typeof(*aux), head);
+		nvkm_i2c_aux_del(&aux);
 	}
 
-	nvkm_subdev_destroy(&i2c->subdev);
-}
-
-static struct nvkm_oclass *
-nvkm_i2c_extdev_sclass[] = {
-	nvkm_anx9805_sclass,
-};
-
-static void
-nvkm_i2c_create_port(struct nvkm_i2c *i2c, int index, u8 type,
-		     struct dcb_i2c_entry *info)
-{
-	const struct nvkm_i2c_impl *impl = (void *)nv_oclass(i2c);
-	struct nvkm_oclass *oclass;
-	struct nvkm_object *parent;
-	struct nvkm_object *object;
-	int ret, pad;
-
-	if (info->share != DCB_I2C_UNUSED) {
-		pad    = info->share;
-		oclass = impl->pad_s;
-	} else {
-		if (type != DCB_I2C_NVIO_AUX)
-			pad = 0x100 + info->drive;
-		else
-			pad = 0x100 + info->auxch;
-		oclass = impl->pad_x;
+	while (!list_empty(&i2c->bus)) {
+		struct nvkm_i2c_bus *bus =
+			list_first_entry(&i2c->bus, typeof(*bus), head);
+		nvkm_i2c_bus_del(&bus);
 	}
 
-	ret = nvkm_object_ctor(nv_object(i2c), NULL, oclass,
-			       NULL, pad, &parent);
-	if (ret < 0)
-		return;
+	while (!list_empty(&i2c->pad)) {
+		struct nvkm_i2c_pad *pad =
+			list_first_entry(&i2c->pad, typeof(*pad), head);
+		nvkm_i2c_pad_del(&pad);
+	}
 
-	oclass = impl->sclass;
-	do {
-		ret = -EINVAL;
-		if (oclass->handle == type) {
-			ret = nvkm_object_ctor(parent, NULL, oclass,
-					       info, index, &object);
-		}
-	} while (ret && (++oclass)->handle);
+	nvkm_subdev_destroy(&i2c->subdev);
+}
 
-	nvkm_object_ref(NULL, &parent);
+static const struct nvkm_i2c_drv {
+	u8 bios;
+	u8 addr;
+	int (*pad_new)(struct nvkm_i2c_bus *, int id, u8 addr,
+		       struct nvkm_i2c_pad **);
 }
+nvkm_i2c_drv[] = {
+	{ 0x0d, 0x39, anx9805_pad_new },
+	{ 0x0e, 0x3b, anx9805_pad_new },
+	{}
+};
 
 int
 nvkm_i2c_create_(struct nvkm_object *parent, struct nvkm_object *engine,
 		 struct nvkm_oclass *oclass, int length, void **pobject)
 {
-	struct nvkm_bios *bios = nvkm_bios(parent);
+	struct nvkm_i2c_impl *impl = (void *)oclass;
+	struct nvkm_device *device = (void *)parent;
+	struct nvkm_bios *bios = device->bios;
 	struct nvkm_i2c *i2c;
-	struct nvkm_object *object;
-	struct dcb_i2c_entry info;
-	int ret, i, j, index = -1;
-	struct dcb_output outp;
-	u8  ver, hdr;
-	u32 data;
+	struct dcb_i2c_entry ccbE;
+	struct dcb_output dcbE;
+	u8 ver, hdr;
+	int ret, i;
 
 	ret = nvkm_subdev_create(parent, engine, oclass, 0, "I2C", "i2c", &i2c);
 	*pobject = nv_object(i2c);
 	if (ret)
 		return ret;
 
+	INIT_LIST_HEAD(&i2c->pad);
+	INIT_LIST_HEAD(&i2c->bus);
+	INIT_LIST_HEAD(&i2c->aux);
+
 	nv_subdev(i2c)->intr = nvkm_i2c_intr;
-	i2c->find = nvkm_i2c_find;
-	i2c->find_type = nvkm_i2c_find_type;
-	i2c->acquire_pad = nvkm_i2c_acquire_pad;
-	i2c->release_pad = nvkm_i2c_release_pad;
-	i2c->acquire = nvkm_i2c_acquire;
-	i2c->release = nvkm_i2c_release;
-	i2c->identify = nvkm_i2c_identify;
-	init_waitqueue_head(&i2c->wait);
-	INIT_LIST_HEAD(&i2c->ports);
-
-	while (!dcb_i2c_parse(bios, ++index, &info)) {
-		switch (info.type) {
-		case DCB_I2C_NV04_BIT:
-		case DCB_I2C_NV4E_BIT:
-		case DCB_I2C_NVIO_BIT:
-			nvkm_i2c_create_port(i2c, NV_I2C_PORT(index),
-					     info.type, &info);
-			break;
-		case DCB_I2C_NVIO_AUX:
-			nvkm_i2c_create_port(i2c, NV_I2C_AUX(index),
-					     info.type, &info);
-			break;
-		case DCB_I2C_PMGR:
-			if (info.drive != DCB_I2C_UNUSED) {
-				nvkm_i2c_create_port(i2c, NV_I2C_PORT(index),
-						     DCB_I2C_NVIO_BIT, &info);
-			}
-			if (info.auxch != DCB_I2C_UNUSED) {
-				nvkm_i2c_create_port(i2c, NV_I2C_AUX(index),
-						     DCB_I2C_NVIO_AUX, &info);
-			}
-			break;
-		case DCB_I2C_UNUSED:
-		default:
+
+	i = -1;
+	while (!dcb_i2c_parse(bios, ++i, &ccbE)) {
+		struct nvkm_i2c_pad *pad = NULL;
+		struct nvkm_i2c_bus *bus = NULL;
+		struct nvkm_i2c_aux *aux = NULL;
+
+		nvkm_debug(&i2c->subdev, "ccb %02x: type %02x drive %02x "
+			   "sense %02x share %02x auxch %02x\n", i, ccbE.type,
+			   ccbE.drive, ccbE.sense, ccbE.share, ccbE.auxch);
+
+		if (ccbE.share != DCB_I2C_UNUSED) {
+			const int id = NVKM_I2C_PAD_HYBRID(ccbE.share);
+			if (!(pad = nvkm_i2c_pad_find(i2c, id)))
+				ret = impl->pad_s_new(i2c, id, &pad);
+			else
+				ret = 0;
+		} else {
+			ret = impl->pad_x_new(i2c, NVKM_I2C_PAD_CCB(i), &pad);
+		}
+
+		if (ret) {
+			nvkm_error(&i2c->subdev, "ccb %02x pad, %d\n", i, ret);
+			nvkm_i2c_pad_del(&pad);
+			continue;
+		}
+
+		if (pad->func->bus_new_0 && ccbE.type == DCB_I2C_NV04_BIT) {
+			ret = pad->func->bus_new_0(pad, NVKM_I2C_BUS_CCB(i),
+						   ccbE.drive,
+						   ccbE.sense, &bus);
+		} else
+		if (pad->func->bus_new_4 &&
+		    ( ccbE.type == DCB_I2C_NV4E_BIT ||
+		      ccbE.type == DCB_I2C_NVIO_BIT ||
+		     (ccbE.type == DCB_I2C_PMGR &&
+		      ccbE.drive != DCB_I2C_UNUSED))) {
+			ret = pad->func->bus_new_4(pad, NVKM_I2C_BUS_CCB(i),
+						   ccbE.drive, &bus);
+		}
+
+		if (ret) {
+			nvkm_error(&i2c->subdev, "ccb %02x bus, %d\n", i, ret);
+			nvkm_i2c_bus_del(&bus);
+		}
+
+		if (pad->func->aux_new_6 &&
+		    ( ccbE.type == DCB_I2C_NVIO_AUX ||
+		     (ccbE.type == DCB_I2C_PMGR &&
+		      ccbE.auxch != DCB_I2C_UNUSED))) {
+			ret = pad->func->aux_new_6(pad, NVKM_I2C_BUS_CCB(i),
+						   ccbE.auxch, &aux);
+		} else {
+			ret = 0;
+		}
+
+		if (ret) {
+			nvkm_error(&i2c->subdev, "ccb %02x aux, %d\n", i, ret);
+			nvkm_i2c_aux_del(&aux);
+		}
+
+		if (ccbE.type != DCB_I2C_UNUSED && !bus && !aux) {
+			nvkm_warn(&i2c->subdev, "ccb %02x was ignored\n", i);
 			continue;
 		}
 	}
 
-	/* in addition to the busses specified in the i2c table, there
-	 * may be ddc/aux channels hiding behind external tmds/dp/etc
-	 * transmitters.
-	 */
-	index = NV_I2C_EXT(0);
 	i = -1;
-	while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) {
-		if (!outp.location || !outp.extdev)
+	while (dcb_outp_parse(bios, ++i, &ver, &hdr, &dcbE)) {
+		const struct nvkm_i2c_drv *drv = nvkm_i2c_drv;
+		struct nvkm_i2c_bus *bus;
+		struct nvkm_i2c_pad *pad;
+
+		/* internal outputs handled by native i2c busses (above) */
+		if (!dcbE.location)
+			continue;
+
+		/* we need an i2c bus to talk to the external encoder */
+		bus = nvkm_i2c_bus_find(i2c, dcbE.i2c_index);
+		if (!bus) {
+			nvkm_debug(&i2c->subdev, "dcb %02x no bus\n", i);
 			continue;
+		}
 
-		switch (outp.type) {
-		case DCB_OUTPUT_TMDS:
-			info.type = NV_I2C_TYPE_EXTDDC(outp.extdev);
-			break;
-		case DCB_OUTPUT_DP:
-			info.type = NV_I2C_TYPE_EXTAUX(outp.extdev);
-			break;
-		default:
+		/* ... and a driver for it */
+		while (drv->pad_new) {
+			if (drv->bios == dcbE.extdev)
+				break;
+			drv++;
+		}
+
+		if (!drv->pad_new) {
+			nvkm_debug(&i2c->subdev, "dcb %02x drv %02x unknown\n",
+				   i, dcbE.extdev);
 			continue;
 		}
 
-		ret = -ENODEV;
-		j = -1;
-		while (ret && ++j < ARRAY_SIZE(nvkm_i2c_extdev_sclass)) {
-			parent = nv_object(i2c->find(i2c, outp.i2c_index));
-			oclass = nvkm_i2c_extdev_sclass[j];
-			do {
-				if (oclass->handle != info.type)
-					continue;
-				ret = nvkm_object_ctor(parent, NULL, oclass,
-						       NULL, index++, &object);
-			} while (ret && (++oclass)->handle);
+		/* find/create an instance of the driver */
+		pad = nvkm_i2c_pad_find(i2c, NVKM_I2C_PAD_EXT(dcbE.extdev));
+		if (!pad) {
+			const int id = NVKM_I2C_PAD_EXT(dcbE.extdev);
+			ret = drv->pad_new(bus, id, drv->addr, &pad);
+			if (ret) {
+				nvkm_error(&i2c->subdev, "dcb %02x pad, %d\n",
+					   i, ret);
+				nvkm_i2c_pad_del(&pad);
+				continue;
+			}
+		}
+
+		/* create any i2c bus / aux channel required by the output */
+		if (pad->func->aux_new_6 && dcbE.type == DCB_OUTPUT_DP) {
+			const int id = NVKM_I2C_AUX_EXT(dcbE.extdev);
+			struct nvkm_i2c_aux *aux = NULL;
+			ret = pad->func->aux_new_6(pad, id, 0, &aux);
+			if (ret) {
+				nvkm_error(&i2c->subdev, "dcb %02x aux, %d\n",
+					   i, ret);
+				nvkm_i2c_aux_del(&aux);
+			}
+		} else
+		if (pad->func->bus_new_4) {
+			const int id = NVKM_I2C_BUS_EXT(dcbE.extdev);
+			struct nvkm_i2c_bus *bus = NULL;
+			ret = pad->func->bus_new_4(pad, id, 0, &bus);
+			if (ret) {
+				nvkm_error(&i2c->subdev, "dcb %02x bus, %d\n",
+					   i, ret);
+				nvkm_i2c_bus_del(&bus);
+			}
 		}
 	}
 
-	ret = nvkm_event_init(&nvkm_i2c_intr_func, 4, index, &i2c->event);
+	ret = nvkm_event_init(&nvkm_i2c_intr_func, 4, i, &i2c->event);
 	if (ret)
 		return ret;
 
diff --git a/drm/nouveau/nvkm/subdev/i2c/bit.c b/drm/nouveau/nvkm/subdev/i2c/bit.c
index 861a453d..cdce11bb 100644
--- a/drm/nouveau/nvkm/subdev/i2c/bit.c
+++ b/drm/nouveau/nvkm/subdev/i2c/bit.c
@@ -9,7 +9,7 @@
  * Software is furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
+ * all copies or substantial busions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
@@ -21,7 +21,7 @@
  *
  * Authors: Ben Skeggs
  */
-#include "priv.h"
+#include "bus.h"
 
 #ifdef CONFIG_NOUVEAU_I2C_INTERNAL
 #define T_TIMEOUT  2200000
@@ -29,205 +29,188 @@
 #define T_HOLD     5000
 
 static inline void
-i2c_drive_scl(struct nvkm_i2c_port *port, int state)
+nvkm_i2c_drive_scl(struct nvkm_i2c_bus *bus, int state)
 {
-	port->func->drive_scl(port, state);
+	bus->func->drive_scl(bus, state);
 }
 
 static inline void
-i2c_drive_sda(struct nvkm_i2c_port *port, int state)
+nvkm_i2c_drive_sda(struct nvkm_i2c_bus *bus, int state)
 {
-	port->func->drive_sda(port, state);
+	bus->func->drive_sda(bus, state);
 }
 
 static inline int
-i2c_sense_scl(struct nvkm_i2c_port *port)
+nvkm_i2c_sense_scl(struct nvkm_i2c_bus *bus)
 {
-	return port->func->sense_scl(port);
+	return bus->func->sense_scl(bus);
 }
 
 static inline int
-i2c_sense_sda(struct nvkm_i2c_port *port)
+nvkm_i2c_sense_sda(struct nvkm_i2c_bus *bus)
 {
-	return port->func->sense_sda(port);
+	return bus->func->sense_sda(bus);
 }
 
 static void
-i2c_delay(struct nvkm_i2c_port *port, u32 nsec)
+nvkm_i2c_delay(struct nvkm_i2c_bus *bus, u32 nsec)
 {
 	udelay((nsec + 500) / 1000);
 }
 
 static bool
-i2c_raise_scl(struct nvkm_i2c_port *port)
+nvkm_i2c_raise_scl(struct nvkm_i2c_bus *bus)
 {
 	u32 timeout = T_TIMEOUT / T_RISEFALL;
 
-	i2c_drive_scl(port, 1);
+	nvkm_i2c_drive_scl(bus, 1);
 	do {
-		i2c_delay(port, T_RISEFALL);
-	} while (!i2c_sense_scl(port) && --timeout);
+		nvkm_i2c_delay(bus, T_RISEFALL);
+	} while (!nvkm_i2c_sense_scl(bus) && --timeout);
 
 	return timeout != 0;
 }
 
 static int
-i2c_start(struct nvkm_i2c_port *port)
+i2c_start(struct nvkm_i2c_bus *bus)
 {
 	int ret = 0;
 
-	if (!i2c_sense_scl(port) ||
-	    !i2c_sense_sda(port)) {
-		i2c_drive_scl(port, 0);
-		i2c_drive_sda(port, 1);
-		if (!i2c_raise_scl(port))
+	if (!nvkm_i2c_sense_scl(bus) ||
+	    !nvkm_i2c_sense_sda(bus)) {
+		nvkm_i2c_drive_scl(bus, 0);
+		nvkm_i2c_drive_sda(bus, 1);
+		if (!nvkm_i2c_raise_scl(bus))
 			ret = -EBUSY;
 	}
 
-	i2c_drive_sda(port, 0);
-	i2c_delay(port, T_HOLD);
-	i2c_drive_scl(port, 0);
-	i2c_delay(port, T_HOLD);
+	nvkm_i2c_drive_sda(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
 	return ret;
 }
 
 static void
-i2c_stop(struct nvkm_i2c_port *port)
+i2c_stop(struct nvkm_i2c_bus *bus)
 {
-	i2c_drive_scl(port, 0);
-	i2c_drive_sda(port, 0);
-	i2c_delay(port, T_RISEFALL);
-
-	i2c_drive_scl(port, 1);
-	i2c_delay(port, T_HOLD);
-	i2c_drive_sda(port, 1);
-	i2c_delay(port, T_HOLD);
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_drive_sda(bus, 0);
+	nvkm_i2c_delay(bus, T_RISEFALL);
+
+	nvkm_i2c_drive_scl(bus, 1);
+	nvkm_i2c_delay(bus, T_HOLD);
+	nvkm_i2c_drive_sda(bus, 1);
+	nvkm_i2c_delay(bus, T_HOLD);
 }
 
 static int
-i2c_bitw(struct nvkm_i2c_port *port, int sda)
+i2c_bitw(struct nvkm_i2c_bus *bus, int sda)
 {
-	i2c_drive_sda(port, sda);
-	i2c_delay(port, T_RISEFALL);
+	nvkm_i2c_drive_sda(bus, sda);
+	nvkm_i2c_delay(bus, T_RISEFALL);
 
-	if (!i2c_raise_scl(port))
+	if (!nvkm_i2c_raise_scl(bus))
 		return -ETIMEDOUT;
-	i2c_delay(port, T_HOLD);
+	nvkm_i2c_delay(bus, T_HOLD);
 
-	i2c_drive_scl(port, 0);
-	i2c_delay(port, T_HOLD);
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
 	return 0;
 }
 
 static int
-i2c_bitr(struct nvkm_i2c_port *port)
+i2c_bitr(struct nvkm_i2c_bus *bus)
 {
 	int sda;
 
-	i2c_drive_sda(port, 1);
-	i2c_delay(port, T_RISEFALL);
+	nvkm_i2c_drive_sda(bus, 1);
+	nvkm_i2c_delay(bus, T_RISEFALL);
 
-	if (!i2c_raise_scl(port))
+	if (!nvkm_i2c_raise_scl(bus))
 		return -ETIMEDOUT;
-	i2c_delay(port, T_HOLD);
+	nvkm_i2c_delay(bus, T_HOLD);
 
-	sda = i2c_sense_sda(port);
+	sda = nvkm_i2c_sense_sda(bus);
 
-	i2c_drive_scl(port, 0);
-	i2c_delay(port, T_HOLD);
+	nvkm_i2c_drive_scl(bus, 0);
+	nvkm_i2c_delay(bus, T_HOLD);
 	return sda;
 }
 
 static int
-i2c_get_byte(struct nvkm_i2c_port *port, u8 *byte, bool last)
+nvkm_i2c_get_byte(struct nvkm_i2c_bus *bus, u8 *byte, bool last)
 {
 	int i, bit;
 
 	*byte = 0;
 	for (i = 7; i >= 0; i--) {
-		bit = i2c_bitr(port);
+		bit = i2c_bitr(bus);
 		if (bit < 0)
 			return bit;
 		*byte |= bit << i;
 	}
 
-	return i2c_bitw(port, last ? 1 : 0);
+	return i2c_bitw(bus, last ? 1 : 0);
 }
 
 static int
-i2c_put_byte(struct nvkm_i2c_port *port, u8 byte)
+nvkm_i2c_put_byte(struct nvkm_i2c_bus *bus, u8 byte)
 {
 	int i, ret;
 	for (i = 7; i >= 0; i--) {
-		ret = i2c_bitw(port, !!(byte & (1 << i)));
+		ret = i2c_bitw(bus, !!(byte & (1 << i)));
 		if (ret < 0)
 			return ret;
 	}
 
-	ret = i2c_bitr(port);
+	ret = i2c_bitr(bus);
 	if (ret == 1) /* nack */
 		ret = -EIO;
 	return ret;
 }
 
 static int
-i2c_addr(struct nvkm_i2c_port *port, struct i2c_msg *msg)
+i2c_addr(struct nvkm_i2c_bus *bus, struct i2c_msg *msg)
 {
 	u32 addr = msg->addr << 1;
 	if (msg->flags & I2C_M_RD)
 		addr |= 1;
-	return i2c_put_byte(port, addr);
+	return nvkm_i2c_put_byte(bus, addr);
 }
 
-static int
-i2c_bit_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+int
+nvkm_i2c_bit_xfer(struct nvkm_i2c_bus *bus, struct i2c_msg *msgs, int num)
 {
-	struct nvkm_i2c_port *port = adap->algo_data;
 	struct i2c_msg *msg = msgs;
 	int ret = 0, mcnt = num;
 
-	ret = nvkm_i2c(port)->acquire(port, nsecs_to_jiffies(T_TIMEOUT));
-	if (ret)
-		return ret;
-
 	while (!ret && mcnt--) {
 		u8 remaining = msg->len;
 		u8 *ptr = msg->buf;
 
-		ret = i2c_start(port);
+		ret = i2c_start(bus);
 		if (ret == 0)
-			ret = i2c_addr(port, msg);
+			ret = i2c_addr(bus, msg);
 
 		if (msg->flags & I2C_M_RD) {
 			while (!ret && remaining--)
-				ret = i2c_get_byte(port, ptr++, !remaining);
+				ret = nvkm_i2c_get_byte(bus, ptr++, !remaining);
 		} else {
 			while (!ret && remaining--)
-				ret = i2c_put_byte(port, *ptr++);
+				ret = nvkm_i2c_put_byte(bus, *ptr++);
 		}
 
 		msg++;
 	}
 
-	i2c_stop(port);
-	nvkm_i2c(port)->release(port);
+	i2c_stop(bus);
 	return (ret < 0) ? ret : num;
 }
 #else
-static int
-i2c_bit_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+int
+nvkm_i2c_bit_xfer(struct nvkm_i2c_bus *bus, struct i2c_msg *msgs, int num)
 {
 	return -ENODEV;
 }
 #endif
-
-static u32
-i2c_bit_func(struct i2c_adapter *adap)
-{
-	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
-}
-
-const struct i2c_algorithm nvkm_i2c_bit_algo = {
-	.master_xfer = i2c_bit_xfer,
-	.functionality = i2c_bit_func
-};
diff --git a/drm/nouveau/nvkm/subdev/i2c/bus.c b/drm/nouveau/nvkm/subdev/i2c/bus.c
new file mode 100644
index 00000000..807a2b67
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/bus.c
@@ -0,0 +1,245 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#include "bus.h"
+#include "pad.h"
+
+#include <core/option.h>
+
+/*******************************************************************************
+ * i2c-algo-bit
+ ******************************************************************************/
+static int
+nvkm_i2c_bus_pre_xfer(struct i2c_adapter *adap)
+{
+	struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
+	return nvkm_i2c_bus_acquire(bus);
+}
+
+static void
+nvkm_i2c_bus_post_xfer(struct i2c_adapter *adap)
+{
+	struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
+	return nvkm_i2c_bus_release(bus);
+}
+
+static void
+nvkm_i2c_bus_setscl(void *data, int state)
+{
+	struct nvkm_i2c_bus *bus = data;
+	bus->func->drive_scl(bus, state);
+}
+
+static void
+nvkm_i2c_bus_setsda(void *data, int state)
+{
+	struct nvkm_i2c_bus *bus = data;
+	bus->func->drive_sda(bus, state);
+}
+
+static int
+nvkm_i2c_bus_getscl(void *data)
+{
+	struct nvkm_i2c_bus *bus = data;
+	return bus->func->sense_scl(bus);
+}
+
+static int
+nvkm_i2c_bus_getsda(void *data)
+{
+	struct nvkm_i2c_bus *bus = data;
+	return bus->func->sense_sda(bus);
+}
+
+/*******************************************************************************
+ * !i2c-algo-bit (off-chip i2c bus / hw i2c / internal bit-banging algo)
+ ******************************************************************************/
+static int
+nvkm_i2c_bus_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
+{
+	struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
+	int ret;
+
+	ret = nvkm_i2c_bus_acquire(bus);
+	if (ret)
+		return ret;
+
+	ret = bus->func->xfer(bus, msgs, num);
+	nvkm_i2c_bus_release(bus);
+	return ret;
+}
+
+static u32
+nvkm_i2c_bus_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm
+nvkm_i2c_bus_algo = {
+	.master_xfer = nvkm_i2c_bus_xfer,
+	.functionality = nvkm_i2c_bus_func,
+};
+
+/*******************************************************************************
+ * nvkm_i2c_bus base
+ ******************************************************************************/
+void
+nvkm_i2c_bus_init(struct nvkm_i2c_bus *bus)
+{
+	BUS_TRACE(bus, "init");
+	if (bus->func->init)
+		bus->func->init(bus);
+}
+
+void
+nvkm_i2c_bus_release(struct nvkm_i2c_bus *bus)
+{
+	struct nvkm_i2c_pad *pad = bus->pad;
+	BUS_TRACE(bus, "release");
+	nvkm_i2c_pad_release(pad);
+	mutex_unlock(&bus->mutex);
+}
+
+int
+nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *bus)
+{
+	struct nvkm_i2c_pad *pad = bus->pad;
+	int ret;
+	BUS_TRACE(bus, "acquire");
+	mutex_lock(&bus->mutex);
+	ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_I2C);
+	if (ret)
+		mutex_unlock(&bus->mutex);
+	return ret;
+}
+
+int
+nvkm_i2c_bus_probe(struct nvkm_i2c_bus *bus, const char *what,
+		   struct nvkm_i2c_bus_probe *info,
+		   bool (*match)(struct nvkm_i2c_bus *,
+				 struct i2c_board_info *, void *), void *data)
+{
+	int i;
+
+	BUS_DBG(bus, "probing %ss", what);
+	for (i = 0; info[i].dev.addr; i++) {
+		u8 orig_udelay = 0;
+
+		if ((bus->i2c.algo == &i2c_bit_algo) && (info[i].udelay != 0)) {
+			struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
+			BUS_DBG(bus, "%dms delay instead of %dms",
+				     info[i].udelay, algo->udelay);
+			orig_udelay = algo->udelay;
+			algo->udelay = info[i].udelay;
+		}
+
+		if (nvkm_probe_i2c(&bus->i2c, info[i].dev.addr) &&
+		    (!match || match(bus, &info[i].dev, data))) {
+			BUS_DBG(bus, "detected %s: %s",
+				what, info[i].dev.type);
+			return i;
+		}
+
+		if (orig_udelay) {
+			struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
+			algo->udelay = orig_udelay;
+		}
+	}
+
+	BUS_DBG(bus, "no devices found.");
+	return -ENODEV;
+}
+
+void
+nvkm_i2c_bus_del(struct nvkm_i2c_bus **pbus)
+{
+	struct nvkm_i2c_bus *bus = *pbus;
+	if (bus && !WARN_ON(!bus->func)) {
+		BUS_TRACE(bus, "dtor");
+		list_del(&bus->head);
+		i2c_del_adapter(&bus->i2c);
+		kfree(bus->i2c.algo_data);
+		kfree(*pbus);
+		*pbus = NULL;
+	}
+}
+
+int
+nvkm_i2c_bus_ctor(const struct nvkm_i2c_bus_func *func,
+		  struct nvkm_i2c_pad *pad, int id,
+		  struct nvkm_i2c_bus *bus)
+{
+	struct nvkm_device *device = pad->i2c->subdev.device;
+	struct i2c_algo_bit_data *bit;
+#ifndef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
+	const bool internal = false;
+#else
+	const bool internal = true;
+#endif
+	int ret;
+
+	bus->func = func;
+	bus->pad = pad;
+	bus->id = id;
+	mutex_init(&bus->mutex);
+	list_add_tail(&bus->head, &pad->i2c->bus);
+	BUS_TRACE(bus, "ctor");
+
+	snprintf(bus->i2c.name, sizeof(bus->i2c.name), "nvkm-%s-bus-%04x",
+		 dev_name(device->dev), id);
+	bus->i2c.owner = THIS_MODULE;
+	bus->i2c.dev.parent = device->dev;
+
+	if ( bus->func->drive_scl &&
+	    !nvkm_boolopt(device->cfgopt, "NvI2C", internal)) {
+		if (!(bit = kzalloc(sizeof(*bit), GFP_KERNEL)))
+			return -ENOMEM;
+		bit->udelay = 10;
+		bit->timeout = usecs_to_jiffies(2200);
+		bit->data = bus;
+		bit->pre_xfer = nvkm_i2c_bus_pre_xfer;
+		bit->post_xfer = nvkm_i2c_bus_post_xfer;
+		bit->setscl = nvkm_i2c_bus_setscl;
+		bit->setsda = nvkm_i2c_bus_setsda;
+		bit->getscl = nvkm_i2c_bus_getscl;
+		bit->getsda = nvkm_i2c_bus_getsda;
+		bus->i2c.algo_data = bit;
+		ret = i2c_bit_add_bus(&bus->i2c);
+	} else {
+		bus->i2c.algo = &nvkm_i2c_bus_algo;
+		ret = i2c_add_adapter(&bus->i2c);
+	}
+
+	return ret;
+}
+
+int
+nvkm_i2c_bus_new_(const struct nvkm_i2c_bus_func *func,
+		  struct nvkm_i2c_pad *pad, int id,
+		  struct nvkm_i2c_bus **pbus)
+{
+	if (!(*pbus = kzalloc(sizeof(**pbus), GFP_KERNEL)))
+		return -ENOMEM;
+	return nvkm_i2c_bus_ctor(func, pad, id, *pbus);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/bus.h b/drm/nouveau/nvkm/subdev/i2c/bus.h
new file mode 100644
index 00000000..e1be14c2
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/bus.h
@@ -0,0 +1,37 @@
+#ifndef __NVKM_I2C_BUS_H__
+#define __NVKM_I2C_BUS_H__
+#include "pad.h"
+
+struct nvkm_i2c_bus_func {
+	void (*init)(struct nvkm_i2c_bus *);
+	void (*drive_scl)(struct nvkm_i2c_bus *, int state);
+	void (*drive_sda)(struct nvkm_i2c_bus *, int state);
+	int (*sense_scl)(struct nvkm_i2c_bus *);
+	int (*sense_sda)(struct nvkm_i2c_bus *);
+	int (*xfer)(struct nvkm_i2c_bus *, struct i2c_msg *, int num);
+};
+
+int nvkm_i2c_bus_ctor(const struct nvkm_i2c_bus_func *, struct nvkm_i2c_pad *,
+		      int id, struct nvkm_i2c_bus *);
+int nvkm_i2c_bus_new_(const struct nvkm_i2c_bus_func *, struct nvkm_i2c_pad *,
+		      int id, struct nvkm_i2c_bus **);
+void nvkm_i2c_bus_del(struct nvkm_i2c_bus **);
+void nvkm_i2c_bus_init(struct nvkm_i2c_bus *);
+
+int nvkm_i2c_bit_xfer(struct nvkm_i2c_bus *, struct i2c_msg *, int);
+
+int nv04_i2c_bus_new(struct nvkm_i2c_pad *, int, u8, u8,
+		     struct nvkm_i2c_bus **);
+
+int nv4e_i2c_bus_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_bus **);
+int nv50_i2c_bus_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_bus **);
+int gf119_i2c_bus_new(struct nvkm_i2c_pad *, int, u8, struct nvkm_i2c_bus **);
+
+#define BUS_MSG(b,l,f,a...) do {                                               \
+	struct nvkm_i2c_bus *_bus = (b);                                       \
+	nvkm_##l(&_bus->pad->i2c->subdev, "bus %04x: "f"\n", _bus->id, ##a);   \
+} while(0)
+#define BUS_ERR(b,f,a...) BUS_MSG((b), error, f, ##a)
+#define BUS_DBG(b,f,a...) BUS_MSG((b), debug, f, ##a)
+#define BUS_TRACE(b,f,a...) BUS_MSG((b), trace, f, ##a)
+#endif
diff --git a/drm/nouveau/nvkm/subdev/i2c/busgf119.c b/drm/nouveau/nvkm/subdev/i2c/busgf119.c
new file mode 100644
index 00000000..96bbdda0
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/busgf119.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial busions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#define gf119_i2c_bus(p) container_of((p), struct gf119_i2c_bus, base)
+#include "bus.h"
+
+struct gf119_i2c_bus {
+	struct nvkm_i2c_bus base;
+	u32 addr;
+};
+
+static void
+gf119_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
+{
+	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	nvkm_mask(device, bus->addr, 0x00000001, state ? 0x00000001 : 0);
+}
+
+static void
+gf119_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
+{
+	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	nvkm_mask(device, bus->addr, 0x00000002, state ? 0x00000002 : 0);
+}
+
+static int
+gf119_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
+{
+	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rd32(device, bus->addr) & 0x00000010);
+}
+
+static int
+gf119_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
+{
+	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rd32(device, bus->addr) & 0x00000020);
+}
+
+static void
+gf119_i2c_bus_init(struct nvkm_i2c_bus *base)
+{
+	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	nvkm_wr32(device, bus->addr, 0x00000007);
+}
+
+static const struct nvkm_i2c_bus_func
+gf119_i2c_bus_func = {
+	.init = gf119_i2c_bus_init,
+	.drive_scl = gf119_i2c_bus_drive_scl,
+	.drive_sda = gf119_i2c_bus_drive_sda,
+	.sense_scl = gf119_i2c_bus_sense_scl,
+	.sense_sda = gf119_i2c_bus_sense_sda,
+	.xfer = nvkm_i2c_bit_xfer,
+};
+
+int
+gf119_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
+		 struct nvkm_i2c_bus **pbus)
+{
+	struct gf119_i2c_bus *bus;
+
+	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
+		return -ENOMEM;
+	*pbus = &bus->base;
+
+	nvkm_i2c_bus_ctor(&gf119_i2c_bus_func, pad, id, &bus->base);
+	bus->addr = 0x00d014 + (drive * 0x20);
+	return 0;
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/busnv04.c b/drm/nouveau/nvkm/subdev/i2c/busnv04.c
new file mode 100644
index 00000000..a58db159
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/busnv04.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial busions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#define nv04_i2c_bus(p) container_of((p), struct nv04_i2c_bus, base)
+#include "bus.h"
+
+#include <subdev/vga.h>
+
+struct nv04_i2c_bus {
+	struct nvkm_i2c_bus base;
+	u8 drive;
+	u8 sense;
+};
+
+static void
+nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
+{
+	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	u8 val = nvkm_rdvgac(device, 0, bus->drive);
+	if (state) val |= 0x20;
+	else	   val &= 0xdf;
+	nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
+}
+
+static void
+nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
+{
+	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	u8 val = nvkm_rdvgac(device, 0, bus->drive);
+	if (state) val |= 0x10;
+	else	   val &= 0xef;
+	nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
+}
+
+static int
+nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
+{
+	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x04);
+}
+
+static int
+nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
+{
+	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x08);
+}
+
+static const struct nvkm_i2c_bus_func
+nv04_i2c_bus_func = {
+	.drive_scl = nv04_i2c_bus_drive_scl,
+	.drive_sda = nv04_i2c_bus_drive_sda,
+	.sense_scl = nv04_i2c_bus_sense_scl,
+	.sense_sda = nv04_i2c_bus_sense_sda,
+	.xfer = nvkm_i2c_bit_xfer,
+};
+
+int
+nv04_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, u8 sense,
+		 struct nvkm_i2c_bus **pbus)
+{
+	struct nv04_i2c_bus *bus;
+
+	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
+		return -ENOMEM;
+	*pbus = &bus->base;
+
+	nvkm_i2c_bus_ctor(&nv04_i2c_bus_func, pad, id, &bus->base);
+	bus->drive = drive;
+	bus->sense = sense;
+	return 0;
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/busnv4e.c b/drm/nouveau/nvkm/subdev/i2c/busnv4e.c
new file mode 100644
index 00000000..cdd73dcb
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/busnv4e.c
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial busions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#define nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base)
+#include "bus.h"
+
+struct nv4e_i2c_bus {
+	struct nvkm_i2c_bus base;
+	u32 addr;
+};
+
+static void
+nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
+{
+	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01);
+}
+
+static void
+nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
+{
+	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01);
+}
+
+static int
+nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
+{
+	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rd32(device, bus->addr) & 0x00040000);
+}
+
+static int
+nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
+{
+	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rd32(device, bus->addr) & 0x00080000);
+}
+
+static const struct nvkm_i2c_bus_func
+nv4e_i2c_bus_func = {
+	.drive_scl = nv4e_i2c_bus_drive_scl,
+	.drive_sda = nv4e_i2c_bus_drive_sda,
+	.sense_scl = nv4e_i2c_bus_sense_scl,
+	.sense_sda = nv4e_i2c_bus_sense_sda,
+	.xfer = nvkm_i2c_bit_xfer,
+};
+
+int
+nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
+		 struct nvkm_i2c_bus **pbus)
+{
+	struct nv4e_i2c_bus *bus;
+
+	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
+		return -ENOMEM;
+	*pbus = &bus->base;
+
+	nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base);
+	bus->addr = 0x600800 + drive;
+	return 0;
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/busnv50.c b/drm/nouveau/nvkm/subdev/i2c/busnv50.c
new file mode 100644
index 00000000..8db83993
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/busnv50.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright 2015 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial busions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
+ */
+#define nv50_i2c_bus(p) container_of((p), struct nv50_i2c_bus, base)
+#include "bus.h"
+
+#include <subdev/vga.h>
+
+struct nv50_i2c_bus {
+	struct nvkm_i2c_bus base;
+	u32 addr;
+	u32 data;
+};
+
+static void
+nv50_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
+{
+	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	if (state) bus->data |= 0x01;
+	else	   bus->data &= 0xfe;
+	nvkm_wr32(device, bus->addr, bus->data);
+}
+
+static void
+nv50_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
+{
+	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	if (state) bus->data |= 0x02;
+	else	   bus->data &= 0xfd;
+	nvkm_wr32(device, bus->addr, bus->data);
+}
+
+static int
+nv50_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
+{
+	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rd32(device, bus->addr) & 0x00000001);
+}
+
+static int
+nv50_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
+{
+	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	return !!(nvkm_rd32(device, bus->addr) & 0x00000002);
+}
+
+static void
+nv50_i2c_bus_init(struct nvkm_i2c_bus *base)
+{
+	struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
+	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
+	nvkm_wr32(device, bus->addr, (bus->data = 0x00000007));
+}
+
+static const struct nvkm_i2c_bus_func
+nv50_i2c_bus_func = {
+	.init = nv50_i2c_bus_init,
+	.drive_scl = nv50_i2c_bus_drive_scl,
+	.drive_sda = nv50_i2c_bus_drive_sda,
+	.sense_scl = nv50_i2c_bus_sense_scl,
+	.sense_sda = nv50_i2c_bus_sense_sda,
+	.xfer = nvkm_i2c_bit_xfer,
+};
+
+int
+nv50_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
+		 struct nvkm_i2c_bus **pbus)
+{
+	static const u32 addr[] = {
+		0x00e138, 0x00e150, 0x00e168, 0x00e180,
+		0x00e254, 0x00e274, 0x00e764, 0x00e780,
+		0x00e79c, 0x00e7b8
+	};
+	struct nv50_i2c_bus *bus;
+
+	if (drive >= ARRAY_SIZE(addr)) {
+		nvkm_warn(&pad->i2c->subdev, "bus %d unknown\n", drive);
+		return -ENODEV;
+	}
+
+	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
+		return -ENOMEM;
+	*pbus = &bus->base;
+
+	nvkm_i2c_bus_ctor(&nv50_i2c_bus_func, pad, id, &bus->base);
+	bus->addr = addr[drive];
+	bus->data = 0x00000007;
+	return 0;
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/g94.c b/drm/nouveau/nvkm/subdev/i2c/g94.c
index acbfbe0a..e18dc855 100644
--- a/drm/nouveau/nvkm/subdev/i2c/g94.c
+++ b/drm/nouveau/nvkm/subdev/i2c/g94.c
@@ -21,7 +21,8 @@
  *
  * Authors: Ben Skeggs
  */
-#include "nv50.h"
+#include "priv.h"
+#include "pad.h"
 
 void
 g94_aux_stat(struct nvkm_i2c *i2c, u32 *hi, u32 *lo, u32 *rq, u32 *tx)
@@ -55,219 +56,6 @@ g94_aux_mask(struct nvkm_i2c *i2c, u32 type, u32 mask, u32 data)
 	nvkm_wr32(device, 0x00e068, temp);
 }
 
-#define AUX_DBG(fmt, args...)                                                  \
-	nvkm_debug(&i2c->subdev, "AUXCH(%d): " fmt, ch, ##args)
-#define AUX_ERR(fmt, args...)                                                  \
-	nvkm_error(&i2c->subdev, "AUXCH(%d): " fmt, ch, ##args)
-
-static void
-auxch_fini(struct nvkm_i2c *i2c, int ch)
-{
-	struct nvkm_device *device = i2c->subdev.device;
-	nvkm_mask(device, 0x00e4e4 + (ch * 0x50), 0x00310000, 0x00000000);
-}
-
-static int
-auxch_init(struct nvkm_i2c *i2c, int ch)
-{
-	struct nvkm_device *device = i2c->subdev.device;
-	const u32 unksel = 1; /* nfi which to use, or if it matters.. */
-	const u32 ureq = unksel ? 0x00100000 : 0x00200000;
-	const u32 urep = unksel ? 0x01000000 : 0x02000000;
-	u32 ctrl, timeout;
-
-	/* wait up to 1ms for any previous transaction to be done... */
-	timeout = 1000;
-	do {
-		ctrl = nvkm_rd32(device, 0x00e4e4 + (ch * 0x50));
-		udelay(1);
-		if (!timeout--) {
-			AUX_ERR("begin idle timeout %08x\n", ctrl);
-			return -EBUSY;
-		}
-	} while (ctrl & 0x03010000);
-
-	/* set some magic, and wait up to 1ms for it to appear */
-	nvkm_mask(device, 0x00e4e4 + (ch * 0x50), 0x00300000, ureq);
-	timeout = 1000;
-	do {
-		ctrl = nvkm_rd32(device, 0x00e4e4 + (ch * 0x50));
-		udelay(1);
-		if (!timeout--) {
-			AUX_ERR("magic wait %08x\n", ctrl);
-			auxch_fini(i2c, ch);
-			return -EBUSY;
-		}
-	} while ((ctrl & 0x03000000) != urep);
-
-	return 0;
-}
-
-int
-g94_aux(struct nvkm_i2c_port *base, bool retry,
-	 u8 type, u32 addr, u8 *data, u8 size)
-{
-	struct nvkm_i2c *i2c = nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	u32 ctrl, stat, timeout, retries;
-	u32 xbuf[4] = {};
-	int ch = port->addr;
-	int ret, i;
-
-	AUX_DBG("%d: %08x %d\n", type, addr, size);
-
-	ret = auxch_init(i2c, ch);
-	if (ret < 0)
-		goto out;
-
-	stat = nvkm_rd32(device, 0x00e4e8 + (ch * 0x50));
-	if (!(stat & 0x10000000)) {
-		AUX_DBG("sink not detected\n");
-		ret = -ENXIO;
-		goto out;
-	}
-
-	if (!(type & 1)) {
-		memcpy(xbuf, data, size);
-		for (i = 0; i < 16; i += 4) {
-			AUX_DBG("wr %08x\n", xbuf[i / 4]);
-			nvkm_wr32(device, 0x00e4c0 + (ch * 0x50) + i, xbuf[i / 4]);
-		}
-	}
-
-	ctrl  = nvkm_rd32(device, 0x00e4e4 + (ch * 0x50));
-	ctrl &= ~0x0001f0ff;
-	ctrl |= type << 12;
-	ctrl |= size - 1;
-	nvkm_wr32(device, 0x00e4e0 + (ch * 0x50), addr);
-
-	/* (maybe) retry transaction a number of times on failure... */
-	for (retries = 0; !ret && retries < 32; retries++) {
-		/* reset, and delay a while if this is a retry */
-		nvkm_wr32(device, 0x00e4e4 + (ch * 0x50), 0x80000000 | ctrl);
-		nvkm_wr32(device, 0x00e4e4 + (ch * 0x50), 0x00000000 | ctrl);
-		if (retries)
-			udelay(400);
-
-		/* transaction request, wait up to 1ms for it to complete */
-		nvkm_wr32(device, 0x00e4e4 + (ch * 0x50), 0x00010000 | ctrl);
-
-		timeout = 1000;
-		do {
-			ctrl = nvkm_rd32(device, 0x00e4e4 + (ch * 0x50));
-			udelay(1);
-			if (!timeout--) {
-				AUX_ERR("tx req timeout %08x\n", ctrl);
-				ret = -EIO;
-				goto out;
-			}
-		} while (ctrl & 0x00010000);
-		ret = 1;
-
-		/* read status, and check if transaction completed ok */
-		stat = nvkm_mask(device, 0x00e4e8 + (ch * 0x50), 0, 0);
-		if ((stat & 0x000f0000) == 0x00080000 ||
-		    (stat & 0x000f0000) == 0x00020000)
-			ret = retry ? 0 : 1;
-		if ((stat & 0x00000100))
-			ret = -ETIMEDOUT;
-		if ((stat & 0x00000e00))
-			ret = -EIO;
-
-		AUX_DBG("%02d %08x %08x\n", retries, ctrl, stat);
-	}
-
-	if (type & 1) {
-		for (i = 0; i < 16; i += 4) {
-			xbuf[i / 4] = nvkm_rd32(device, 0x00e4d0 + (ch * 0x50) + i);
-			AUX_DBG("rd %08x\n", xbuf[i / 4]);
-		}
-		memcpy(data, xbuf, size);
-	}
-
-out:
-	auxch_fini(i2c, ch);
-	return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
-}
-
-static const struct nvkm_i2c_func
-g94_i2c_func = {
-	.drive_scl = nv50_i2c_drive_scl,
-	.drive_sda = nv50_i2c_drive_sda,
-	.sense_scl = nv50_i2c_sense_scl,
-	.sense_sda = nv50_i2c_sense_sda,
-};
-
-static int
-g94_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		  struct nvkm_oclass *oclass, void *data, u32 index,
-		  struct nvkm_object **pobject)
-{
-	struct dcb_i2c_entry *info = data;
-	struct nv50_i2c_port *port;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_bit_algo, &g94_i2c_func, &port);
-	*pobject = nv_object(port);
-	if (ret)
-		return ret;
-
-	if (info->drive >= nv50_i2c_addr_nr)
-		return -EINVAL;
-
-	port->state = 7;
-	port->addr = nv50_i2c_addr[info->drive];
-	return 0;
-}
-
-static const struct nvkm_i2c_func
-g94_aux_func = {
-	.aux       = g94_aux,
-};
-
-int
-g94_aux_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		  struct nvkm_oclass *oclass, void *data, u32 index,
-		  struct nvkm_object **pobject)
-{
-	struct dcb_i2c_entry *info = data;
-	struct nv50_i2c_port *port;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_aux_algo, &g94_aux_func, &port);
-	*pobject = nv_object(port);
-	if (ret)
-		return ret;
-
-	port->base.aux = info->auxch;
-	port->addr = info->auxch;
-	return 0;
-}
-
-static struct nvkm_oclass
-g94_i2c_sclass[] = {
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = g94_i2c_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = nv50_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_AUX),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = g94_aux_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = _nvkm_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{}
-};
-
 struct nvkm_oclass *
 g94_i2c_oclass = &(struct nvkm_i2c_impl) {
 	.base.handle = NV_SUBDEV(I2C, 0x94),
@@ -277,9 +65,8 @@ g94_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = g94_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
-	.pad_s = &g94_i2c_pad_oclass,
+	.pad_x_new = g94_i2c_pad_x_new,
+	.pad_s_new = g94_i2c_pad_s_new,
 	.aux = 4,
 	.aux_stat = g94_aux_stat,
 	.aux_mask = g94_aux_mask,
diff --git a/drm/nouveau/nvkm/subdev/i2c/gf110.c b/drm/nouveau/nvkm/subdev/i2c/gf110.c
index 6795e5c2..cb6774ae 100644
--- a/drm/nouveau/nvkm/subdev/i2c/gf110.c
+++ b/drm/nouveau/nvkm/subdev/i2c/gf110.c
@@ -21,74 +21,8 @@
  *
  * Authors: Ben Skeggs
  */
-#include "nv50.h"
-
-static int
-gf110_i2c_sense_scl(struct nvkm_i2c_port *base)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	return !!(nvkm_rd32(device, port->addr) & 0x00000010);
-}
-
-static int
-gf110_i2c_sense_sda(struct nvkm_i2c_port *base)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	return !!(nvkm_rd32(device, port->addr) & 0x00000020);
-}
-
-static const struct nvkm_i2c_func
-gf110_i2c_func = {
-	.drive_scl = nv50_i2c_drive_scl,
-	.drive_sda = nv50_i2c_drive_sda,
-	.sense_scl = gf110_i2c_sense_scl,
-	.sense_sda = gf110_i2c_sense_sda,
-};
-
-int
-gf110_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		    struct nvkm_oclass *oclass, void *data, u32 index,
-		    struct nvkm_object **pobject)
-{
-	struct dcb_i2c_entry *info = data;
-	struct nv50_i2c_port *port;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_bit_algo, &gf110_i2c_func, &port);
-	*pobject = nv_object(port);
-	if (ret)
-		return ret;
-
-	port->state = 0x00000007;
-	port->addr = 0x00d014 + (info->drive * 0x20);
-	return 0;
-}
-
-struct nvkm_oclass
-gf110_i2c_sclass[] = {
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = gf110_i2c_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = nv50_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_AUX),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = g94_aux_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = _nvkm_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{}
-};
+#include "priv.h"
+#include "pad.h"
 
 struct nvkm_oclass *
 gf110_i2c_oclass = &(struct nvkm_i2c_impl) {
@@ -99,9 +33,8 @@ gf110_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = gf110_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
-	.pad_s = &g94_i2c_pad_oclass,
+	.pad_x_new = gf119_i2c_pad_x_new,
+	.pad_s_new = gf119_i2c_pad_s_new,
 	.aux = 4,
 	.aux_stat = g94_aux_stat,
 	.aux_mask = g94_aux_mask,
diff --git a/drm/nouveau/nvkm/subdev/i2c/gf117.c b/drm/nouveau/nvkm/subdev/i2c/gf117.c
index e290b40f..bd5e7c98 100644
--- a/drm/nouveau/nvkm/subdev/i2c/gf117.c
+++ b/drm/nouveau/nvkm/subdev/i2c/gf117.c
@@ -21,7 +21,8 @@
  *
  * Authors: Ben Skeggs
  */
-#include "nv50.h"
+#include "priv.h"
+#include "pad.h"
 
 struct nvkm_oclass *
 gf117_i2c_oclass = &(struct nvkm_i2c_impl) {
@@ -32,7 +33,5 @@ gf117_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = gf110_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
-	.pad_s = &nv04_i2c_pad_oclass,
+	.pad_x_new = gf119_i2c_pad_x_new,
 }.base;
diff --git a/drm/nouveau/nvkm/subdev/i2c/gk104.c b/drm/nouveau/nvkm/subdev/i2c/gk104.c
index 9573fdb7..ac97c206 100644
--- a/drm/nouveau/nvkm/subdev/i2c/gk104.c
+++ b/drm/nouveau/nvkm/subdev/i2c/gk104.c
@@ -21,7 +21,8 @@
  *
  * Authors: Ben Skeggs
  */
-#include "nv50.h"
+#include "priv.h"
+#include "pad.h"
 
 void
 gk104_aux_stat(struct nvkm_i2c *i2c, u32 *hi, u32 *lo, u32 *rq, u32 *tx)
@@ -64,9 +65,8 @@ gk104_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = gf110_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
-	.pad_s = &g94_i2c_pad_oclass,
+	.pad_x_new = gf119_i2c_pad_x_new,
+	.pad_s_new = gf119_i2c_pad_s_new,
 	.aux = 4,
 	.aux_stat = gk104_aux_stat,
 	.aux_mask = gk104_aux_mask,
diff --git a/drm/nouveau/nvkm/subdev/i2c/gm204.c b/drm/nouveau/nvkm/subdev/i2c/gm204.c
index f027aedb..e84b9a4a 100644
--- a/drm/nouveau/nvkm/subdev/i2c/gm204.c
+++ b/drm/nouveau/nvkm/subdev/i2c/gm204.c
@@ -21,190 +21,8 @@
  *
  * Authors: Ben Skeggs
  */
-#include "nv50.h"
-
-#define AUX_DBG(fmt, args...)                                                  \
-	nvkm_debug(&i2c->subdev, "AUXCH(%d): " fmt, ch, ##args)
-#define AUX_ERR(fmt, args...)                                                  \
-	nvkm_error(&i2c->subdev, "AUXCH(%d): " fmt, ch, ##args)
-
-static void
-auxch_fini(struct nvkm_i2c *i2c, int ch)
-{
-	struct nvkm_device *device = i2c->subdev.device;
-	nvkm_mask(device, 0x00d954 + (ch * 0x50), 0x00310000, 0x00000000);
-}
-
-static int
-auxch_init(struct nvkm_i2c *i2c, int ch)
-{
-	struct nvkm_device *device = i2c->subdev.device;
-	const u32 unksel = 1; /* nfi which to use, or if it matters.. */
-	const u32 ureq = unksel ? 0x00100000 : 0x00200000;
-	const u32 urep = unksel ? 0x01000000 : 0x02000000;
-	u32 ctrl, timeout;
-
-	/* wait up to 1ms for any previous transaction to be done... */
-	timeout = 1000;
-	do {
-		ctrl = nvkm_rd32(device, 0x00d954 + (ch * 0x50));
-		udelay(1);
-		if (!timeout--) {
-			AUX_ERR("begin idle timeout %08x\n", ctrl);
-			return -EBUSY;
-		}
-	} while (ctrl & 0x03010000);
-
-	/* set some magic, and wait up to 1ms for it to appear */
-	nvkm_mask(device, 0x00d954 + (ch * 0x50), 0x00300000, ureq);
-	timeout = 1000;
-	do {
-		ctrl = nvkm_rd32(device, 0x00d954 + (ch * 0x50));
-		udelay(1);
-		if (!timeout--) {
-			AUX_ERR("magic wait %08x\n", ctrl);
-			auxch_fini(i2c, ch);
-			return -EBUSY;
-		}
-	} while ((ctrl & 0x03000000) != urep);
-
-	return 0;
-}
-
-int
-gm204_aux(struct nvkm_i2c_port *base, bool retry,
-	 u8 type, u32 addr, u8 *data, u8 size)
-{
-	struct nvkm_i2c *i2c = nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	u32 ctrl, stat, timeout, retries;
-	u32 xbuf[4] = {};
-	int ch = port->addr;
-	int ret, i;
-
-	AUX_DBG("%d: %08x %d\n", type, addr, size);
-
-	ret = auxch_init(i2c, ch);
-	if (ret < 0)
-		goto out;
-
-	stat = nvkm_rd32(device, 0x00d958 + (ch * 0x50));
-	if (!(stat & 0x10000000)) {
-		AUX_DBG("sink not detected\n");
-		ret = -ENXIO;
-		goto out;
-	}
-
-	if (!(type & 1)) {
-		memcpy(xbuf, data, size);
-		for (i = 0; i < 16; i += 4) {
-			AUX_DBG("wr %08x\n", xbuf[i / 4]);
-			nvkm_wr32(device, 0x00d930 + (ch * 0x50) + i, xbuf[i / 4]);
-		}
-	}
-
-	ctrl  = nvkm_rd32(device, 0x00d954 + (ch * 0x50));
-	ctrl &= ~0x0001f0ff;
-	ctrl |= type << 12;
-	ctrl |= size - 1;
-	nvkm_wr32(device, 0x00d950 + (ch * 0x50), addr);
-
-	/* (maybe) retry transaction a number of times on failure... */
-	for (retries = 0; !ret && retries < 32; retries++) {
-		/* reset, and delay a while if this is a retry */
-		nvkm_wr32(device, 0x00d954 + (ch * 0x50), 0x80000000 | ctrl);
-		nvkm_wr32(device, 0x00d954 + (ch * 0x50), 0x00000000 | ctrl);
-		if (retries)
-			udelay(400);
-
-		/* transaction request, wait up to 1ms for it to complete */
-		nvkm_wr32(device, 0x00d954 + (ch * 0x50), 0x00010000 | ctrl);
-
-		timeout = 1000;
-		do {
-			ctrl = nvkm_rd32(device, 0x00d954 + (ch * 0x50));
-			udelay(1);
-			if (!timeout--) {
-				AUX_ERR("tx req timeout %08x\n", ctrl);
-				ret = -EIO;
-				goto out;
-			}
-		} while (ctrl & 0x00010000);
-		ret = 1;
-
-		/* read status, and check if transaction completed ok */
-		stat = nvkm_mask(device, 0x00d958 + (ch * 0x50), 0, 0);
-		if ((stat & 0x000f0000) == 0x00080000 ||
-		    (stat & 0x000f0000) == 0x00020000)
-			ret = retry ? 0 : 1;
-		if ((stat & 0x00000100))
-			ret = -ETIMEDOUT;
-		if ((stat & 0x00000e00))
-			ret = -EIO;
-
-		AUX_DBG("%02d %08x %08x\n", retries, ctrl, stat);
-	}
-
-	if (type & 1) {
-		for (i = 0; i < 16; i += 4) {
-			xbuf[i / 4] = nvkm_rd32(device, 0x00d940 + (ch * 0x50) + i);
-			AUX_DBG("rd %08x\n", xbuf[i / 4]);
-		}
-		memcpy(data, xbuf, size);
-	}
-
-out:
-	auxch_fini(i2c, ch);
-	return ret < 0 ? ret : (stat & 0x000f0000) >> 16;
-}
-
-static const struct nvkm_i2c_func
-gm204_aux_func = {
-	.aux       = gm204_aux,
-};
-
-int
-gm204_aux_port_ctor(struct nvkm_object *parent,
-		    struct nvkm_object *engine,
-		    struct nvkm_oclass *oclass, void *data, u32 index,
-		    struct nvkm_object **pobject)
-{
-	struct dcb_i2c_entry *info = data;
-	struct nv50_i2c_port *port;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_aux_algo, &gm204_aux_func, &port);
-	*pobject = nv_object(port);
-	if (ret)
-		return ret;
-
-	port->base.aux = info->auxch;
-	port->addr = info->auxch;
-	return 0;
-}
-
-struct nvkm_oclass
-gm204_i2c_sclass[] = {
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = gf110_i2c_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = nv50_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_AUX),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = gm204_aux_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = _nvkm_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{}
-};
+#include "priv.h"
+#include "pad.h"
 
 struct nvkm_oclass *
 gm204_i2c_oclass = &(struct nvkm_i2c_impl) {
@@ -215,9 +33,8 @@ gm204_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = gm204_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
-	.pad_s = &gm204_i2c_pad_oclass,
+	.pad_x_new = gf119_i2c_pad_x_new,
+	.pad_s_new = gm204_i2c_pad_s_new,
 	.aux = 8,
 	.aux_stat = gk104_aux_stat,
 	.aux_mask = gk104_aux_mask,
diff --git a/drm/nouveau/nvkm/subdev/i2c/nv04.c b/drm/nouveau/nvkm/subdev/i2c/nv04.c
index e76c555d..9a7279f3 100644
--- a/drm/nouveau/nvkm/subdev/i2c/nv04.c
+++ b/drm/nouveau/nvkm/subdev/i2c/nv04.c
@@ -22,93 +22,7 @@
  * Authors: Ben Skeggs
  */
 #include "priv.h"
-
-#include <subdev/vga.h>
-
-struct nv04_i2c_port {
-	struct nvkm_i2c_port base;
-	u8 drive;
-	u8 sense;
-};
-
-static void
-nv04_i2c_drive_scl(struct nvkm_i2c_port *base, int state)
-{
-	struct nvkm_device *device = nvkm_i2c(base)->subdev.device;
-	struct nv04_i2c_port *port = (void *)base;
-	u8 val = nvkm_rdvgac(device, 0, port->drive);
-	if (state) val |= 0x20;
-	else	   val &= 0xdf;
-	nvkm_wrvgac(device, 0, port->drive, val | 0x01);
-}
-
-static void
-nv04_i2c_drive_sda(struct nvkm_i2c_port *base, int state)
-{
-	struct nvkm_device *device = nvkm_i2c(base)->subdev.device;
-	struct nv04_i2c_port *port = (void *)base;
-	u8 val = nvkm_rdvgac(device, 0, port->drive);
-	if (state) val |= 0x10;
-	else	   val &= 0xef;
-	nvkm_wrvgac(device, 0, port->drive, val | 0x01);
-}
-
-static int
-nv04_i2c_sense_scl(struct nvkm_i2c_port *base)
-{
-	struct nvkm_device *device = nvkm_i2c(base)->subdev.device;
-	struct nv04_i2c_port *port = (void *)base;
-	return !!(nvkm_rdvgac(device, 0, port->sense) & 0x04);
-}
-
-static int
-nv04_i2c_sense_sda(struct nvkm_i2c_port *base)
-{
-	struct nvkm_device *device = nvkm_i2c(base)->subdev.device;
-	struct nv04_i2c_port *port = (void *)base;
-	return !!(nvkm_rdvgac(device, 0, port->sense) & 0x08);
-}
-
-static const struct nvkm_i2c_func
-nv04_i2c_func = {
-	.drive_scl = nv04_i2c_drive_scl,
-	.drive_sda = nv04_i2c_drive_sda,
-	.sense_scl = nv04_i2c_sense_scl,
-	.sense_sda = nv04_i2c_sense_sda,
-};
-
-static int
-nv04_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		   struct nvkm_oclass *oclass, void *data, u32 index,
-		   struct nvkm_object **pobject)
-{
-	struct dcb_i2c_entry *info = data;
-	struct nv04_i2c_port *port;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_bit_algo, &nv04_i2c_func, &port);
-	*pobject = nv_object(port);
-	if (ret)
-		return ret;
-
-	port->drive = info->drive;
-	port->sense = info->sense;
-	return 0;
-}
-
-static struct nvkm_oclass
-nv04_i2c_sclass[] = {
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NV04_BIT),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = nv04_i2c_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = _nvkm_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{}
-};
+#include "pad.h"
 
 struct nvkm_oclass *
 nv04_i2c_oclass = &(struct nvkm_i2c_impl) {
@@ -119,6 +33,5 @@ nv04_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = nv04_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
+	.pad_x_new = nv04_i2c_pad_new,
 }.base;
diff --git a/drm/nouveau/nvkm/subdev/i2c/nv4e.c b/drm/nouveau/nvkm/subdev/i2c/nv4e.c
index 24edcdbc..40533d78 100644
--- a/drm/nouveau/nvkm/subdev/i2c/nv4e.c
+++ b/drm/nouveau/nvkm/subdev/i2c/nv4e.c
@@ -22,89 +22,7 @@
  * Authors: Ben Skeggs
  */
 #include "priv.h"
-
-#include <subdev/vga.h>
-
-struct nv4e_i2c_port {
-	struct nvkm_i2c_port base;
-	u32 addr;
-};
-
-static void
-nv4e_i2c_drive_scl(struct nvkm_i2c_port *base, int state)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv4e_i2c_port *port = (void *)base;
-	nvkm_mask(device, port->addr, 0x2f, state ? 0x21 : 0x01);
-}
-
-static void
-nv4e_i2c_drive_sda(struct nvkm_i2c_port *base, int state)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv4e_i2c_port *port = (void *)base;
-	nvkm_mask(device, port->addr, 0x1f, state ? 0x11 : 0x01);
-}
-
-static int
-nv4e_i2c_sense_scl(struct nvkm_i2c_port *base)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv4e_i2c_port *port = (void *)base;
-	return !!(nvkm_rd32(device, port->addr) & 0x00040000);
-}
-
-static int
-nv4e_i2c_sense_sda(struct nvkm_i2c_port *base)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv4e_i2c_port *port = (void *)base;
-	return !!(nvkm_rd32(device, port->addr) & 0x00080000);
-}
-
-static const struct nvkm_i2c_func
-nv4e_i2c_func = {
-	.drive_scl = nv4e_i2c_drive_scl,
-	.drive_sda = nv4e_i2c_drive_sda,
-	.sense_scl = nv4e_i2c_sense_scl,
-	.sense_sda = nv4e_i2c_sense_sda,
-};
-
-static int
-nv4e_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		   struct nvkm_oclass *oclass, void *data, u32 index,
-		   struct nvkm_object **pobject)
-{
-	struct dcb_i2c_entry *info = data;
-	struct nv4e_i2c_port *port;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_bit_algo, &nv4e_i2c_func, &port);
-	*pobject = nv_object(port);
-	if (ret)
-		return ret;
-
-	port->addr = 0x600800 + info->drive;
-	return 0;
-}
-
-static struct nvkm_oclass
-nv4e_i2c_sclass[] = {
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NV4E_BIT),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = nv4e_i2c_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = _nvkm_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{}
-};
+#include "pad.h"
 
 struct nvkm_oclass *
 nv4e_i2c_oclass = &(struct nvkm_i2c_impl) {
@@ -115,6 +33,5 @@ nv4e_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = nv4e_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
+	.pad_x_new = nv4e_i2c_pad_new,
 }.base;
diff --git a/drm/nouveau/nvkm/subdev/i2c/nv50.c b/drm/nouveau/nvkm/subdev/i2c/nv50.c
index 6c04fe00..678585c4 100644
--- a/drm/nouveau/nvkm/subdev/i2c/nv50.c
+++ b/drm/nouveau/nvkm/subdev/i2c/nv50.c
@@ -21,108 +21,8 @@
  *
  * Authors: Ben Skeggs
  */
-#include "nv50.h"
-
-void
-nv50_i2c_drive_scl(struct nvkm_i2c_port *base, int state)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	if (state) port->state |= 0x01;
-	else	   port->state &= 0xfe;
-	nvkm_wr32(device, port->addr, port->state);
-}
-
-void
-nv50_i2c_drive_sda(struct nvkm_i2c_port *base, int state)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	if (state) port->state |= 0x02;
-	else	   port->state &= 0xfd;
-	nvkm_wr32(device, port->addr, port->state);
-}
-
-int
-nv50_i2c_sense_scl(struct nvkm_i2c_port *base)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	return !!(nvkm_rd32(device, port->addr) & 0x00000001);
-}
-
-int
-nv50_i2c_sense_sda(struct nvkm_i2c_port *base)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(base);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)base;
-	return !!(nvkm_rd32(device, port->addr) & 0x00000002);
-}
-
-static const struct nvkm_i2c_func
-nv50_i2c_func = {
-	.drive_scl = nv50_i2c_drive_scl,
-	.drive_sda = nv50_i2c_drive_sda,
-	.sense_scl = nv50_i2c_sense_scl,
-	.sense_sda = nv50_i2c_sense_sda,
-};
-
-const u32 nv50_i2c_addr[] = {
-	0x00e138, 0x00e150, 0x00e168, 0x00e180,
-	0x00e254, 0x00e274, 0x00e764, 0x00e780,
-	0x00e79c, 0x00e7b8
-};
-const int nv50_i2c_addr_nr = ARRAY_SIZE(nv50_i2c_addr);
-
-static int
-nv50_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		   struct nvkm_oclass *oclass, void *data, u32 index,
-		   struct nvkm_object **pobject)
-{
-	struct dcb_i2c_entry *info = data;
-	struct nv50_i2c_port *port;
-	int ret;
-
-	ret = nvkm_i2c_port_create(parent, engine, oclass, index,
-				   &nvkm_i2c_bit_algo, &nv50_i2c_func, &port);
-	*pobject = nv_object(port);
-	if (ret)
-		return ret;
-
-	if (info->drive >= nv50_i2c_addr_nr)
-		return -EINVAL;
-
-	port->state = 0x00000007;
-	port->addr = nv50_i2c_addr[info->drive];
-	return 0;
-}
-
-int
-nv50_i2c_port_init(struct nvkm_object *object)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(object);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct nv50_i2c_port *port = (void *)object;
-	nvkm_wr32(device, port->addr, port->state);
-	return nvkm_i2c_port_init(&port->base);
-}
-
-static struct nvkm_oclass
-nv50_i2c_sclass[] = {
-	{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT),
-	  .ofuncs = &(struct nvkm_ofuncs) {
-		  .ctor = nv50_i2c_port_ctor,
-		  .dtor = _nvkm_i2c_port_dtor,
-		  .init = nv50_i2c_port_init,
-		  .fini = _nvkm_i2c_port_fini,
-	  },
-	},
-	{}
-};
+#include "priv.h"
+#include "pad.h"
 
 struct nvkm_oclass *
 nv50_i2c_oclass = &(struct nvkm_i2c_impl) {
@@ -133,6 +33,5 @@ nv50_i2c_oclass = &(struct nvkm_i2c_impl) {
 		.init = _nvkm_i2c_init,
 		.fini = _nvkm_i2c_fini,
 	},
-	.sclass = nv50_i2c_sclass,
-	.pad_x = &nv04_i2c_pad_oclass,
+	.pad_x_new = nv50_i2c_pad_new,
 }.base;
diff --git a/drm/nouveau/nvkm/subdev/i2c/nv50.h b/drm/nouveau/nvkm/subdev/i2c/nv50.h
deleted file mode 100644
index 520bafbf..00000000
--- a/drm/nouveau/nvkm/subdev/i2c/nv50.h
+++ /dev/null
@@ -1,28 +0,0 @@
-#ifndef __NV50_I2C_H__
-#define __NV50_I2C_H__
-#include "priv.h"
-
-struct nv50_i2c_port {
-	struct nvkm_i2c_port base;
-	u32 addr;
-	u32 state;
-};
-
-extern const u32 nv50_i2c_addr[];
-extern const int nv50_i2c_addr_nr;
-int  nv50_i2c_port_init(struct nvkm_object *);
-int  nv50_i2c_sense_scl(struct nvkm_i2c_port *);
-int  nv50_i2c_sense_sda(struct nvkm_i2c_port *);
-void nv50_i2c_drive_scl(struct nvkm_i2c_port *, int state);
-void nv50_i2c_drive_sda(struct nvkm_i2c_port *, int state);
-
-int  g94_aux_port_ctor(struct nvkm_object *, struct nvkm_object *,
-			struct nvkm_oclass *, void *, u32,
-			struct nvkm_object **);
-void g94_i2c_acquire(struct nvkm_i2c_port *);
-void g94_i2c_release(struct nvkm_i2c_port *);
-
-int  gf110_i2c_port_ctor(struct nvkm_object *, struct nvkm_object *,
-			struct nvkm_oclass *, void *, u32,
-			struct nvkm_object **);
-#endif
diff --git a/drm/nouveau/nvkm/subdev/i2c/pad.c b/drm/nouveau/nvkm/subdev/i2c/pad.c
index a242eeb6..2c5fcb9c 100644
--- a/drm/nouveau/nvkm/subdev/i2c/pad.c
+++ b/drm/nouveau/nvkm/subdev/i2c/pad.c
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Red Hat Inc.
+ * Copyright 2015 Red Hat Inc.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a
  * copy of this software and associated documentation files (the "Software"),
@@ -19,65 +19,98 @@
  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  * OTHER DEALINGS IN THE SOFTWARE.
  *
- * Authors: Ben Skeggs
+ * Authors: Ben Skeggs <bskeggs@redhat.com>
  */
 #include "pad.h"
 
-int
-_nvkm_i2c_pad_fini(struct nvkm_object *object, bool suspend)
+static void
+nvkm_i2c_pad_mode_locked(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
 {
-	struct nvkm_i2c_pad *pad = (void *)object;
-	DBG("-> NULL\n");
-	pad->port = NULL;
-	return nvkm_object_fini(&pad->base, suspend);
+	PAD_TRACE(pad, "-> %s", (mode == NVKM_I2C_PAD_AUX) ? "aux" :
+			      (mode == NVKM_I2C_PAD_I2C) ? "i2c" : "off");
+	if (pad->func->mode)
+		pad->func->mode(pad, mode);
 }
 
-int
-_nvkm_i2c_pad_init(struct nvkm_object *object)
+void
+nvkm_i2c_pad_mode(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
 {
-	struct nvkm_i2c_pad *pad = (void *)object;
-	DBG("-> PORT:%02x\n", pad->next->index);
-	pad->port = pad->next;
-	return nvkm_object_init(&pad->base);
+	PAD_TRACE(pad, "mode %d", mode);
+	mutex_lock(&pad->mutex);
+	nvkm_i2c_pad_mode_locked(pad, mode);
+	pad->mode = mode;
+	mutex_unlock(&pad->mutex);
 }
 
-int
-nvkm_i2c_pad_create_(struct nvkm_object *parent,
-		     struct nvkm_object *engine,
-		     struct nvkm_oclass *oclass, int index,
-		     int size, void **pobject)
+void
+nvkm_i2c_pad_release(struct nvkm_i2c_pad *pad)
 {
-	struct nvkm_i2c *i2c = nvkm_i2c(parent);
-	struct nvkm_i2c_port *port;
-	struct nvkm_i2c_pad *pad;
-	int ret;
+	PAD_TRACE(pad, "release");
+	if (pad->mode == NVKM_I2C_PAD_OFF)
+		nvkm_i2c_pad_mode_locked(pad, pad->mode);
+	mutex_unlock(&pad->mutex);
+}
 
-	list_for_each_entry(port, &i2c->ports, head) {
-		pad = nvkm_i2c_pad(port);
-		if (pad->index == index) {
-			atomic_inc(&nv_object(pad)->refcount);
-			*pobject = pad;
-			return 1;
+int
+nvkm_i2c_pad_acquire(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
+{
+	PAD_TRACE(pad, "acquire");
+	mutex_lock(&pad->mutex);
+	if (pad->mode != mode) {
+		if (pad->mode != NVKM_I2C_PAD_OFF) {
+			mutex_unlock(&pad->mutex);
+			return -EBUSY;
 		}
+		nvkm_i2c_pad_mode_locked(pad, mode);
 	}
+	return 0;
+}
+
+void
+nvkm_i2c_pad_fini(struct nvkm_i2c_pad *pad)
+{
+	PAD_TRACE(pad, "fini");
+	nvkm_i2c_pad_mode_locked(pad, NVKM_I2C_PAD_OFF);
+}
 
-	ret = nvkm_object_create_(parent, engine, oclass, 0, size, pobject);
-	pad = *pobject;
-	if (ret)
-		return ret;
+void
+nvkm_i2c_pad_init(struct nvkm_i2c_pad *pad)
+{
+	PAD_TRACE(pad, "init");
+	nvkm_i2c_pad_mode_locked(pad, pad->mode);
+}
 
-	pad->index = index;
-	return 0;
+void
+nvkm_i2c_pad_del(struct nvkm_i2c_pad **ppad)
+{
+	struct nvkm_i2c_pad *pad = *ppad;
+	if (pad) {
+		PAD_TRACE(pad, "dtor");
+		list_del(&pad->head);
+		kfree(pad);
+		pad = NULL;
+	}
+}
+
+void
+nvkm_i2c_pad_ctor(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
+		  int id, struct nvkm_i2c_pad *pad)
+{
+	pad->func = func;
+	pad->i2c = i2c;
+	pad->id = id;
+	pad->mode = NVKM_I2C_PAD_OFF;
+	mutex_init(&pad->mutex);
+	list_add_tail(&pad->head, &i2c->pad);
+	PAD_TRACE(pad, "ctor");
 }
 
 int
-_nvkm_i2c_pad_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		   struct nvkm_oclass *oclass, void *data, u32 index,
-		   struct nvkm_object **pobject)
+nvkm_i2c_pad_new_(const struct nvkm_i2c_pad_func *func, struct nvkm_i2c *i2c,
+		  int id, struct nvkm_i2c_pad **ppad)
 {
-	struct nvkm_i2c_pad *pad;
-	int ret;
-	ret = nvkm_i2c_pad_create(parent, engine, oclass, index, &pad);
-	*pobject = nv_object(pad);
-	return ret;
+	if (!(*ppad = kzalloc(sizeof(**ppad), GFP_KERNEL)))
+		return -ENOMEM;
+	nvkm_i2c_pad_ctor(func, i2c, id, *ppad);
+	return 0;
 }
diff --git a/drm/nouveau/nvkm/subdev/i2c/pad.h b/drm/nouveau/nvkm/subdev/i2c/pad.h
index 577b18ec..9eeb9929 100644
--- a/drm/nouveau/nvkm/subdev/i2c/pad.h
+++ b/drm/nouveau/nvkm/subdev/i2c/pad.h
@@ -1,58 +1,67 @@
 #ifndef __NVKM_I2C_PAD_H__
 #define __NVKM_I2C_PAD_H__
-#include "priv.h"
+#include <subdev/i2c.h>
 
 struct nvkm_i2c_pad {
-	struct nvkm_object base;
-	int index;
-	struct nvkm_i2c_port *port;
-	struct nvkm_i2c_port *next;
+	const struct nvkm_i2c_pad_func *func;
+	struct nvkm_i2c *i2c;
+#define NVKM_I2C_PAD_HYBRID(n) /* 'n' is hw pad index */                     (n)
+#define NVKM_I2C_PAD_CCB(n) /* 'n' is ccb index */                 ((n) + 0x100)
+#define NVKM_I2C_PAD_EXT(n) /* 'n' is dcb external encoder type */ ((n) + 0x200)
+	int id;
+
+	enum nvkm_i2c_pad_mode {
+		NVKM_I2C_PAD_OFF,
+		NVKM_I2C_PAD_I2C,
+		NVKM_I2C_PAD_AUX,
+	} mode;
+	struct mutex mutex;
+	struct list_head head;
+};
+
+struct nvkm_i2c_pad_func {
+	int (*bus_new_0)(struct nvkm_i2c_pad *, int id, u8 drive, u8 sense,
+			 struct nvkm_i2c_bus **);
+	int (*bus_new_4)(struct nvkm_i2c_pad *, int id, u8 drive,
+			 struct nvkm_i2c_bus **);
+
+	int (*aux_new_6)(struct nvkm_i2c_pad *, int id, u8 drive,
+			 struct nvkm_i2c_aux **);
+
+	void (*mode)(struct nvkm_i2c_pad *, enum nvkm_i2c_pad_mode);
 };
 
-static inline struct nvkm_i2c_pad *
-nvkm_i2c_pad(struct nvkm_i2c_port *port)
-{
-	struct nvkm_object *pad = nv_object(port);
-	while (!nv_iclass(pad->parent, NV_SUBDEV_CLASS))
-		pad = pad->parent;
-	return (void *)pad;
-}
-
-#define nvkm_i2c_pad_create(p,e,o,i,d)                                         \
-	nvkm_i2c_pad_create_((p), (e), (o), (i), sizeof(**d), (void **)d)
-#define nvkm_i2c_pad_destroy(p) ({                                             \
-	struct nvkm_i2c_pad *_p = (p);                                         \
-	_nvkm_i2c_pad_dtor(nv_object(_p));                                     \
-})
-#define nvkm_i2c_pad_init(p) ({                                                \
-	struct nvkm_i2c_pad *_p = (p);                                         \
-	_nvkm_i2c_pad_init(nv_object(_p));                                     \
-})
-#define nvkm_i2c_pad_fini(p,s) ({                                              \
-	struct nvkm_i2c_pad *_p = (p);                                         \
-	_nvkm_i2c_pad_fini(nv_object(_p), (s));                                \
-})
-
-int nvkm_i2c_pad_create_(struct nvkm_object *, struct nvkm_object *,
-			 struct nvkm_oclass *, int index, int, void **);
-
-int _nvkm_i2c_pad_ctor(struct nvkm_object *, struct nvkm_object *,
-		       struct nvkm_oclass *, void *, u32,
-		       struct nvkm_object **);
-#define _nvkm_i2c_pad_dtor nvkm_object_destroy
-int _nvkm_i2c_pad_init(struct nvkm_object *);
-int _nvkm_i2c_pad_fini(struct nvkm_object *, bool);
-
-#ifndef MSG
-#define MSG(l,f,a...) do {                                                     \
-	struct nvkm_i2c_pad *_pad = (void *)pad;                               \
-	struct nvkm_i2c *_i2c = nvkm_i2c(_pad);                                \
-	nvkm_##l(&_i2c->subdev, "PAD:%c:%02x: "f,                              \
-		 _pad->index >= 0x100 ? 'X' : 'S',                             \
-		 _pad->index >= 0x100 ?                                        \
-		 _pad->index - 0x100 : _pad->index, ##a);                      \
+void nvkm_i2c_pad_ctor(const struct nvkm_i2c_pad_func *, struct nvkm_i2c *,
+		       int id, struct nvkm_i2c_pad *);
+int nvkm_i2c_pad_new_(const struct nvkm_i2c_pad_func *, struct nvkm_i2c *,
+		      int id, struct nvkm_i2c_pad **);
+void nvkm_i2c_pad_del(struct nvkm_i2c_pad **);
+void nvkm_i2c_pad_init(struct nvkm_i2c_pad *);
+void nvkm_i2c_pad_fini(struct nvkm_i2c_pad *);
+void nvkm_i2c_pad_mode(struct nvkm_i2c_pad *, enum nvkm_i2c_pad_mode);
+int nvkm_i2c_pad_acquire(struct nvkm_i2c_pad *, enum nvkm_i2c_pad_mode);
+void nvkm_i2c_pad_release(struct nvkm_i2c_pad *);
+
+void g94_i2c_pad_mode(struct nvkm_i2c_pad *, enum nvkm_i2c_pad_mode);
+
+int nv04_i2c_pad_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+int nv4e_i2c_pad_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+int nv50_i2c_pad_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+int g94_i2c_pad_x_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+int gf119_i2c_pad_x_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+int gm204_i2c_pad_x_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+
+int g94_i2c_pad_s_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+int gf119_i2c_pad_s_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+int gm204_i2c_pad_s_new(struct nvkm_i2c *, int, struct nvkm_i2c_pad **);
+
+int anx9805_pad_new(struct nvkm_i2c_bus *, int, u8, struct nvkm_i2c_pad **);
+
+#define PAD_MSG(p,l,f,a...) do {                                               \
+	struct nvkm_i2c_pad *_pad = (p);                                       \
+	nvkm_##l(&_pad->i2c->subdev, "pad %04x: "f"\n", _pad->id, ##a);        \
 } while(0)
-#define DBG(f,a...) MSG(debug, f, ##a)
-#define ERR(f,a...) MSG(error, f, ##a)
-#endif
+#define PAD_ERR(p,f,a...) PAD_MSG((p), error, f, ##a)
+#define PAD_DBG(p,f,a...) PAD_MSG((p), debug, f, ##a)
+#define PAD_TRACE(p,f,a...) PAD_MSG((p), trace, f, ##a)
 #endif
diff --git a/drm/nouveau/nvkm/subdev/i2c/padg94.c b/drm/nouveau/nvkm/subdev/i2c/padg94.c
index 2e5f6da9..5904bc5f 100644
--- a/drm/nouveau/nvkm/subdev/i2c/padg94.c
+++ b/drm/nouveau/nvkm/subdev/i2c/padg94.c
@@ -22,66 +22,55 @@
  * Authors: Ben Skeggs
  */
 #include "pad.h"
+#include "aux.h"
+#include "bus.h"
 
-struct g94_i2c_pad {
-	struct nvkm_i2c_pad base;
-	int addr;
-};
-
-static int
-g94_i2c_pad_fini(struct nvkm_object *object, bool suspend)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(object);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct g94_i2c_pad *pad = (void *)object;
-	nvkm_mask(device, 0x00e50c + pad->addr, 0x00000001, 0x00000001);
-	return nvkm_i2c_pad_fini(&pad->base, suspend);
-}
-
-static int
-g94_i2c_pad_init(struct nvkm_object *object)
+void
+g94_i2c_pad_mode(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
 {
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(object);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct g94_i2c_pad *pad = (void *)object;
+	struct nvkm_subdev *subdev = &pad->i2c->subdev;
+	struct nvkm_device *device = subdev->device;
+	const u32 base = (pad->id - NVKM_I2C_PAD_HYBRID(0)) * 0x50;
 
-	switch (nv_oclass(pad->base.next)->handle) {
-	case NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_AUX):
-		nvkm_mask(device, 0x00e500 + pad->addr, 0x0000c003, 0x00000002);
+	switch (mode) {
+	case NVKM_I2C_PAD_OFF:
+		nvkm_mask(device, 0x00e50c + base, 0x00000001, 0x00000001);
+		break;
+	case NVKM_I2C_PAD_I2C:
+		nvkm_mask(device, 0x00e500 + base, 0x0000c003, 0x0000c001);
+		nvkm_mask(device, 0x00e50c + base, 0x00000001, 0x00000000);
+		break;
+	case NVKM_I2C_PAD_AUX:
+		nvkm_mask(device, 0x00e500 + base, 0x0000c003, 0x00000002);
+		nvkm_mask(device, 0x00e50c + base, 0x00000001, 0x00000000);
 		break;
-	case NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT):
 	default:
-		nvkm_mask(device, 0x00e500 + pad->addr, 0x0000c003, 0x0000c001);
+		WARN_ON(1);
 		break;
 	}
-
-	nvkm_mask(device, 0x00e50c + pad->addr, 0x00000001, 0x00000000);
-	return nvkm_i2c_pad_init(&pad->base);
 }
 
-static int
-g94_i2c_pad_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		 struct nvkm_oclass *oclass, void *data, u32 index,
-		 struct nvkm_object **pobject)
-{
-	struct g94_i2c_pad *pad;
-	int ret;
-
-	ret = nvkm_i2c_pad_create(parent, engine, oclass, index, &pad);
-	*pobject = nv_object(pad);
-	if (ret)
-		return ret;
+static const struct nvkm_i2c_pad_func
+g94_i2c_pad_s_func = {
+	.bus_new_4 = nv50_i2c_bus_new,
+	.aux_new_6 = g94_i2c_aux_new,
+	.mode = g94_i2c_pad_mode,
+};
 
-	pad->addr = index * 0x50;;
-	return 0;
+int
+g94_i2c_pad_s_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&g94_i2c_pad_s_func, i2c, id, ppad);
 }
 
-struct nvkm_oclass
-g94_i2c_pad_oclass = {
-	.ofuncs = &(struct nvkm_ofuncs) {
-		.ctor = g94_i2c_pad_ctor,
-		.dtor = _nvkm_i2c_pad_dtor,
-		.init = g94_i2c_pad_init,
-		.fini = g94_i2c_pad_fini,
-	},
+static const struct nvkm_i2c_pad_func
+g94_i2c_pad_x_func = {
+	.bus_new_4 = nv50_i2c_bus_new,
+	.aux_new_6 = g94_i2c_aux_new,
 };
+
+int
+g94_i2c_pad_x_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&g94_i2c_pad_x_func, i2c, id, ppad);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/padgf119.c b/drm/nouveau/nvkm/subdev/i2c/padgf119.c
new file mode 100644
index 00000000..d53212f1
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/padgf119.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "pad.h"
+#include "aux.h"
+#include "bus.h"
+
+static const struct nvkm_i2c_pad_func
+gf119_i2c_pad_s_func = {
+	.bus_new_4 = gf119_i2c_bus_new,
+	.aux_new_6 = g94_i2c_aux_new,
+	.mode = g94_i2c_pad_mode,
+};
+
+int
+gf119_i2c_pad_s_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&gf119_i2c_pad_s_func, i2c, id, ppad);
+}
+
+static const struct nvkm_i2c_pad_func
+gf119_i2c_pad_x_func = {
+	.bus_new_4 = gf119_i2c_bus_new,
+	.aux_new_6 = g94_i2c_aux_new,
+};
+
+int
+gf119_i2c_pad_x_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&gf119_i2c_pad_x_func, i2c, id, ppad);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/padgm204.c b/drm/nouveau/nvkm/subdev/i2c/padgm204.c
index fa430465..24a4d760 100644
--- a/drm/nouveau/nvkm/subdev/i2c/padgm204.c
+++ b/drm/nouveau/nvkm/subdev/i2c/padgm204.c
@@ -22,66 +22,55 @@
  * Authors: Ben Skeggs
  */
 #include "pad.h"
+#include "aux.h"
+#include "bus.h"
 
-struct gm204_i2c_pad {
-	struct nvkm_i2c_pad base;
-	int addr;
-};
-
-static int
-gm204_i2c_pad_fini(struct nvkm_object *object, bool suspend)
-{
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(object);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct gm204_i2c_pad *pad = (void *)object;
-	nvkm_mask(device, 0x00d97c + pad->addr, 0x00000001, 0x00000001);
-	return nvkm_i2c_pad_fini(&pad->base, suspend);
-}
-
-static int
-gm204_i2c_pad_init(struct nvkm_object *object)
+static void
+gm204_i2c_pad_mode(struct nvkm_i2c_pad *pad, enum nvkm_i2c_pad_mode mode)
 {
-	struct nvkm_i2c *i2c = (void *)nvkm_i2c(object);
-	struct nvkm_device *device = i2c->subdev.device;
-	struct gm204_i2c_pad *pad = (void *)object;
+	struct nvkm_subdev *subdev = &pad->i2c->subdev;
+	struct nvkm_device *device = subdev->device;
+	const u32 base = (pad->id - NVKM_I2C_PAD_HYBRID(0)) * 0x50;
 
-	switch (nv_oclass(pad->base.next)->handle) {
-	case NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_AUX):
-		nvkm_mask(device, 0x00d970 + pad->addr, 0x0000c003, 0x00000002);
+	switch (mode) {
+	case NVKM_I2C_PAD_OFF:
+		nvkm_mask(device, 0x00d97c + base, 0x00000001, 0x00000001);
+		break;
+	case NVKM_I2C_PAD_I2C:
+		nvkm_mask(device, 0x00d970 + base, 0x0000c003, 0x0000c001);
+		nvkm_mask(device, 0x00d97c + base, 0x00000001, 0x00000000);
+		break;
+	case NVKM_I2C_PAD_AUX:
+		nvkm_mask(device, 0x00d970 + base, 0x0000c003, 0x00000002);
+		nvkm_mask(device, 0x00d97c + base, 0x00000001, 0x00000000);
 		break;
-	case NV_I2C_TYPE_DCBI2C(DCB_I2C_NVIO_BIT):
 	default:
-		nvkm_mask(device, 0x00d970 + pad->addr, 0x0000c003, 0x0000c001);
+		WARN_ON(1);
 		break;
 	}
-
-	nvkm_mask(device, 0x00d97c + pad->addr, 0x00000001, 0x00000000);
-	return nvkm_i2c_pad_init(&pad->base);
 }
 
-static int
-gm204_i2c_pad_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
-		   struct nvkm_oclass *oclass, void *data, u32 index,
-		   struct nvkm_object **pobject)
-{
-	struct gm204_i2c_pad *pad;
-	int ret;
-
-	ret = nvkm_i2c_pad_create(parent, engine, oclass, index, &pad);
-	*pobject = nv_object(pad);
-	if (ret)
-		return ret;
+static const struct nvkm_i2c_pad_func
+gm204_i2c_pad_s_func = {
+	.bus_new_4 = gf119_i2c_bus_new,
+	.aux_new_6 = gm204_i2c_aux_new,
+	.mode = gm204_i2c_pad_mode,
+};
 
-	pad->addr = index * 0x50;;
-	return 0;
+int
+gm204_i2c_pad_s_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&gm204_i2c_pad_s_func, i2c, id, ppad);
 }
 
-struct nvkm_oclass
-gm204_i2c_pad_oclass = {
-	.ofuncs = &(struct nvkm_ofuncs) {
-		.ctor = gm204_i2c_pad_ctor,
-		.dtor = _nvkm_i2c_pad_dtor,
-		.init = gm204_i2c_pad_init,
-		.fini = gm204_i2c_pad_fini,
-	},
+static const struct nvkm_i2c_pad_func
+gm204_i2c_pad_x_func = {
+	.bus_new_4 = gf119_i2c_bus_new,
+	.aux_new_6 = gm204_i2c_aux_new,
 };
+
+int
+gm204_i2c_pad_x_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&gm204_i2c_pad_x_func, i2c, id, ppad);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/padnv04.c b/drm/nouveau/nvkm/subdev/i2c/padnv04.c
index 22c7daaa..310046ad 100644
--- a/drm/nouveau/nvkm/subdev/i2c/padnv04.c
+++ b/drm/nouveau/nvkm/subdev/i2c/padnv04.c
@@ -22,13 +22,15 @@
  * Authors: Ben Skeggs
  */
 #include "pad.h"
+#include "bus.h"
 
-struct nvkm_oclass
-nv04_i2c_pad_oclass = {
-	.ofuncs = &(struct nvkm_ofuncs) {
-		.ctor = _nvkm_i2c_pad_ctor,
-		.dtor = _nvkm_i2c_pad_dtor,
-		.init = _nvkm_i2c_pad_init,
-		.fini = _nvkm_i2c_pad_fini,
-	},
+static const struct nvkm_i2c_pad_func
+nv04_i2c_pad_func = {
+	.bus_new_0 = nv04_i2c_bus_new,
 };
+
+int
+nv04_i2c_pad_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&nv04_i2c_pad_func, i2c, id, ppad);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/padnv4e.c b/drm/nouveau/nvkm/subdev/i2c/padnv4e.c
new file mode 100644
index 00000000..dda6fc0b
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/padnv4e.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "pad.h"
+#include "bus.h"
+
+static const struct nvkm_i2c_pad_func
+nv4e_i2c_pad_func = {
+	.bus_new_4 = nv4e_i2c_bus_new,
+};
+
+int
+nv4e_i2c_pad_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&nv4e_i2c_pad_func, i2c, id, ppad);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/padnv50.c b/drm/nouveau/nvkm/subdev/i2c/padnv50.c
new file mode 100644
index 00000000..a03f25b1
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/i2c/padnv50.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "pad.h"
+#include "bus.h"
+
+static const struct nvkm_i2c_pad_func
+nv50_i2c_pad_func = {
+	.bus_new_4 = nv50_i2c_bus_new,
+};
+
+int
+nv50_i2c_pad_new(struct nvkm_i2c *i2c, int id, struct nvkm_i2c_pad **ppad)
+{
+	return nvkm_i2c_pad_new_(&nv50_i2c_pad_func, i2c, id, ppad);
+}
diff --git a/drm/nouveau/nvkm/subdev/i2c/port.h b/drm/nouveau/nvkm/subdev/i2c/port.h
deleted file mode 100644
index ac6be726..00000000
--- a/drm/nouveau/nvkm/subdev/i2c/port.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef __NVKM_I2C_PORT_H__
-#define __NVKM_I2C_PORT_H__
-#include "priv.h"
-
-#ifndef MSG
-#define MSG(l,f,a...) do {                                                     \
-	struct nvkm_i2c_port *_port = (void *)port;                            \
-	struct nvkm_i2c *_i2c = nvkm_i2c(_port);                               \
-	nvkm_##l(&_i2c->subdev, "PORT:%02x: "f, _port->index, ##a);            \
-} while(0)
-#define DBG(f,a...) MSG(debug, f, ##a)
-#define ERR(f,a...) MSG(error, f, ##a)
-#endif
-#endif
diff --git a/drm/nouveau/nvkm/subdev/i2c/priv.h b/drm/nouveau/nvkm/subdev/i2c/priv.h
index 6586e156..e320e9da 100644
--- a/drm/nouveau/nvkm/subdev/i2c/priv.h
+++ b/drm/nouveau/nvkm/subdev/i2c/priv.h
@@ -2,31 +2,6 @@
 #define __NVKM_I2C_PRIV_H__
 #include <subdev/i2c.h>
 
-extern struct nvkm_oclass nv04_i2c_pad_oclass;
-extern struct nvkm_oclass g94_i2c_pad_oclass;
-extern struct nvkm_oclass gm204_i2c_pad_oclass;
-
-#define nvkm_i2c_port_create(p,e,o,i,a,f,d)                                 \
-	nvkm_i2c_port_create_((p), (e), (o), (i), (a), (f),                 \
-				 sizeof(**d), (void **)d)
-#define nvkm_i2c_port_destroy(p) ({                                         \
-	struct nvkm_i2c_port *port = (p);                                   \
-	_nvkm_i2c_port_dtor(nv_object(i2c));                                \
-})
-#define nvkm_i2c_port_init(p)                                               \
-	nvkm_object_init(&(p)->base)
-#define nvkm_i2c_port_fini(p,s)                                             \
-	nvkm_object_fini(&(p)->base, (s))
-
-int nvkm_i2c_port_create_(struct nvkm_object *, struct nvkm_object *,
-			     struct nvkm_oclass *, u8,
-			     const struct i2c_algorithm *,
-			     const struct nvkm_i2c_func *,
-			     int, void **);
-void _nvkm_i2c_port_dtor(struct nvkm_object *);
-#define _nvkm_i2c_port_init nvkm_object_init
-int  _nvkm_i2c_port_fini(struct nvkm_object *, bool);
-
 #define nvkm_i2c_create(p,e,o,d)                                            \
 	nvkm_i2c_create_((p), (e), (o), sizeof(**d), (void **)d)
 #define nvkm_i2c_destroy(p) ({                                              \
@@ -51,19 +26,11 @@ void _nvkm_i2c_dtor(struct nvkm_object *);
 int  _nvkm_i2c_init(struct nvkm_object *);
 int  _nvkm_i2c_fini(struct nvkm_object *, bool);
 
-extern struct nvkm_oclass nvkm_anx9805_sclass[];
-extern struct nvkm_oclass gf110_i2c_sclass[];
-
-extern const struct i2c_algorithm nvkm_i2c_bit_algo;
-extern const struct i2c_algorithm nvkm_i2c_aux_algo;
-
 struct nvkm_i2c_impl {
 	struct nvkm_oclass base;
 
-	/* supported i2c port classes */
-	struct nvkm_oclass *sclass;
-	struct nvkm_oclass *pad_x;
-	struct nvkm_oclass *pad_s;
+	int (*pad_x_new)(struct nvkm_i2c *, int id, struct nvkm_i2c_pad **);
+	int (*pad_s_new)(struct nvkm_i2c *, int id, struct nvkm_i2c_pad **);
 
 	/* number of native dp aux channels present */
 	int aux;
diff --git a/drm/nouveau/nvkm/subdev/mxm/base.c b/drm/nouveau/nvkm/subdev/mxm/base.c
index 1818994b..9dcfbffe 100644
--- a/drm/nouveau/nvkm/subdev/mxm/base.c
+++ b/drm/nouveau/nvkm/subdev/mxm/base.c
@@ -29,7 +29,7 @@
 #include <subdev/i2c.h>
 
 static bool
-mxm_shadow_rom_fetch(struct nvkm_i2c_port *i2c, u8 addr,
+mxm_shadow_rom_fetch(struct nvkm_i2c_bus *bus, u8 addr,
 		     u8 offset, u8 size, u8 *data)
 {
 	struct i2c_msg msgs[] = {
@@ -37,7 +37,7 @@ mxm_shadow_rom_fetch(struct nvkm_i2c_port *i2c, u8 addr,
 		{ .addr = addr, .flags = I2C_M_RD, .len = size, .buf = data, },
 	};
 
-	return i2c_transfer(&i2c->adapter, msgs, 2) == 2;
+	return i2c_transfer(&bus->i2c, msgs, 2) == 2;
 }
 
 static bool
@@ -45,19 +45,19 @@ mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
 {
 	struct nvkm_bios *bios = nvkm_bios(mxm);
 	struct nvkm_i2c *i2c = nvkm_i2c(mxm);
-	struct nvkm_i2c_port *port = NULL;
+	struct nvkm_i2c_bus *bus = NULL;
 	u8 i2cidx, mxms[6], addr, size;
 
 	i2cidx = mxm_ddc_map(bios, 1 /* LVDS_DDC */) & 0x0f;
 	if (i2cidx < 0x0f)
-		port = i2c->find(i2c, i2cidx);
-	if (!port)
+		bus = nvkm_i2c_bus_find(i2c, i2cidx);
+	if (!bus)
 		return false;
 
 	addr = 0x54;
-	if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms)) {
+	if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms)) {
 		addr = 0x56;
-		if (!mxm_shadow_rom_fetch(port, addr, 0, 6, mxms))
+		if (!mxm_shadow_rom_fetch(bus, addr, 0, 6, mxms))
 			return false;
 	}
 
@@ -66,7 +66,7 @@ mxm_shadow_rom(struct nvkm_mxm *mxm, u8 version)
 	mxm->mxms = kmalloc(size, GFP_KERNEL);
 
 	if (mxm->mxms &&
-	    mxm_shadow_rom_fetch(port, addr, 0, size, mxm->mxms))
+	    mxm_shadow_rom_fetch(bus, addr, 0, size, mxm->mxms))
 		return true;
 
 	kfree(mxm->mxms);
diff --git a/drm/nouveau/nvkm/subdev/therm/ic.c b/drm/nouveau/nvkm/subdev/therm/ic.c
index f2b0165c..c19af7d2 100644
--- a/drm/nouveau/nvkm/subdev/therm/ic.c
+++ b/drm/nouveau/nvkm/subdev/therm/ic.c
@@ -27,7 +27,7 @@
 #include <subdev/i2c.h>
 
 static bool
-probe_monitoring_device(struct nvkm_i2c_port *i2c,
+probe_monitoring_device(struct nvkm_i2c_bus *bus,
 			struct i2c_board_info *info, void *data)
 {
 	struct nvkm_therm_priv *therm = data;
@@ -36,7 +36,7 @@ probe_monitoring_device(struct nvkm_i2c_port *i2c,
 
 	request_module("%s%s", I2C_MODULE_PREFIX, info->type);
 
-	client = i2c_new_device(&i2c->adapter, info);
+	client = i2c_new_device(&bus->i2c, info);
 	if (!client)
 		return false;
 
@@ -54,7 +54,7 @@ probe_monitoring_device(struct nvkm_i2c_port *i2c,
 	return true;
 }
 
-static struct nvkm_i2c_board_info
+static struct nvkm_i2c_bus_probe
 nv_board_infos[] = {
 	{ { I2C_BOARD_INFO("w83l785ts", 0x2d) }, 0 },
 	{ { I2C_BOARD_INFO("w83781d", 0x2d) }, 0  },
@@ -83,30 +83,36 @@ void
 nvkm_therm_ic_ctor(struct nvkm_therm *obj)
 {
 	struct nvkm_therm_priv *therm = container_of(obj, typeof(*therm), base);
-	struct nvkm_bios *bios = nvkm_bios(therm);
-	struct nvkm_i2c *i2c = nvkm_i2c(therm);
+	struct nvkm_device *device = therm->base.subdev.device;
+	struct nvkm_bios *bios = device->bios;
+	struct nvkm_i2c *i2c = device->i2c;
+	struct nvkm_i2c_bus *bus;
 	struct nvbios_extdev_func extdev_entry;
 
+	bus = nvkm_i2c_bus_find(i2c, NVKM_I2C_BUS_PRI);
+	if (!bus)
+		return;
+
 	if (!nvbios_extdev_find(bios, NVBIOS_EXTDEV_LM89, &extdev_entry)) {
-		struct nvkm_i2c_board_info board[] = {
+		struct nvkm_i2c_bus_probe board[] = {
 		  { { I2C_BOARD_INFO("lm90", extdev_entry.addr >> 1) }, 0},
 		  { }
 		};
 
-		i2c->identify(i2c, NV_I2C_DEFAULT(0), "monitoring device",
-			      board, probe_monitoring_device, therm);
+		nvkm_i2c_bus_probe(bus, "monitoring device", board,
+				   probe_monitoring_device, therm);
 		if (therm->ic)
 			return;
 	}
 
 	if (!nvbios_extdev_find(bios, NVBIOS_EXTDEV_ADT7473, &extdev_entry)) {
-		struct nvkm_i2c_board_info board[] = {
+		struct nvkm_i2c_bus_probe board[] = {
 		  { { I2C_BOARD_INFO("adt7473", extdev_entry.addr >> 1) }, 20 },
 		  { }
 		};
 
-		i2c->identify(i2c, NV_I2C_DEFAULT(0), "monitoring device",
-			      board, probe_monitoring_device, therm);
+		nvkm_i2c_bus_probe(bus, "monitoring device", board,
+				   probe_monitoring_device, therm);
 		if (therm->ic)
 			return;
 	}
@@ -114,6 +120,6 @@ nvkm_therm_ic_ctor(struct nvkm_therm *obj)
 	/* The vbios doesn't provide the address of an exisiting monitoring
 	   device. Let's try our static list.
 	 */
-	i2c->identify(i2c, NV_I2C_DEFAULT(0), "monitoring device",
-		      nv_board_infos, probe_monitoring_device, therm);
+	nvkm_i2c_bus_probe(bus, "monitoring device", nv_board_infos,
+			   probe_monitoring_device, therm);
 }
diff --git a/lib/include/nvif/os.h b/lib/include/nvif/os.h
index 3cb3a163..0116864f 100644
--- a/lib/include/nvif/os.h
+++ b/lib/include/nvif/os.h
@@ -636,7 +636,8 @@ struct device {
 	char name[64];
 };
 
-#define dev_crit(d,f,a...)   printf("nouveau %s: "f, (d)->name, ##a)
+#define dev_name(d) (d)->name
+#define dev_crit(d,f,a...)   printf("nouveau %s: "f, dev_name(d), ##a)
 #define dev_err(d,f,a...)    dev_crit((d), f, ##a)
 #define dev_warn(d,f,a...)   dev_crit((d), f, ##a)
 #define dev_notice(d,f,a...) dev_crit((d), f, ##a)