ASoC: Intel: catpt: Define DSP operations

Implement dsp lifecycle functions such as core RESET and STALL,
SRAM power control and LP clock selection. This also adds functions for
handling transport over DW DMA controller.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200929141247.8058-5-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

2 files changed, 368 insertions, 0 deletions

diff --git a/sound/soc/intel/catpt/core.h b/sound/soc/intel/catpt/core.h
index 3c860c0645dc..9e9b3dceedce 100644
--- a/sound/soc/intel/catpt/core.h
+++ b/sound/soc/intel/catpt/core.h
@@ -99,6 +99,10 @@ struct catpt_dev {
 	struct resource dram;
 	struct resource iram;
 	struct resource *scratch;
+
+	struct list_head stream_list;
+	spinlock_t list_lock;
+	struct mutex clk_mutex;
 };
 
 int catpt_dmac_probe(struct catpt_dev *cdev);
@@ -111,6 +115,16 @@ int catpt_dma_memcpy_fromdsp(struct catpt_dev *cdev, struct dma_chan *chan,
 			     dma_addr_t dst_addr, dma_addr_t src_addr,
 			     size_t size);
 
+void lpt_dsp_pll_shutdown(struct catpt_dev *cdev, bool enable);
+void wpt_dsp_pll_shutdown(struct catpt_dev *cdev, bool enable);
+int lpt_dsp_power_up(struct catpt_dev *cdev);
+int lpt_dsp_power_down(struct catpt_dev *cdev);
+int wpt_dsp_power_up(struct catpt_dev *cdev);
+int wpt_dsp_power_down(struct catpt_dev *cdev);
+int catpt_dsp_stall(struct catpt_dev *cdev, bool stall);
+void catpt_dsp_update_srampge(struct catpt_dev *cdev, struct resource *sram,
+			      unsigned long mask);
+int catpt_dsp_update_lpclock(struct catpt_dev *cdev);
 irqreturn_t catpt_dsp_irq_handler(int irq, void *dev_id);
 irqreturn_t catpt_dsp_irq_thread(int irq, void *dev_id);
 
@@ -129,4 +143,24 @@ int catpt_dsp_send_msg(struct catpt_dev *cdev, struct catpt_ipc_msg request,
 
 int catpt_coredump(struct catpt_dev *cdev);
 
+#include <sound/memalloc.h>
+#include <uapi/sound/asound.h>
+
+struct snd_pcm_substream;
+struct catpt_stream_template;
+
+struct catpt_stream_runtime {
+	struct snd_pcm_substream *substream;
+
+	struct catpt_stream_template *template;
+	struct catpt_stream_info info;
+	struct resource *persistent;
+	struct snd_dma_buffer pgtbl;
+
+	bool allocated;
+	bool prepared;
+
+	struct list_head node;
+};
+
 #endif
diff --git a/sound/soc/intel/catpt/dsp.c b/sound/soc/intel/catpt/dsp.c
index d642ab373425..7d2968571951 100644
--- a/sound/soc/intel/catpt/dsp.c
+++ b/sound/soc/intel/catpt/dsp.c
@@ -8,7 +8,10 @@
 #include <linux/devcoredump.h>
 #include <linux/dma-mapping.h>
 #include <linux/firmware.h>
+#include <linux/pci.h>
+#include <linux/pxa2xx_ssp.h>
 #include "core.h"
+#include "messages.h"
 #include "registers.h"
 
 static bool catpt_dma_filter(struct dma_chan *chan, void *param)
@@ -138,6 +141,337 @@ void catpt_dmac_remove(struct catpt_dev *cdev)
 	dw_dma_remove(cdev->dmac);
 }
 
+static void catpt_dsp_set_srampge(struct catpt_dev *cdev, struct resource *sram,
+				  unsigned long mask, unsigned long new)
+{
+	unsigned long old;
+	u32 off = sram->start;
+	u32 b = __ffs(mask);
+
+	old = catpt_readl_pci(cdev, VDRTCTL0) & mask;
+	dev_dbg(cdev->dev, "SRAMPGE [0x%08lx] 0x%08lx -> 0x%08lx",
+		mask, old, new);
+
+	if (old == new)
+		return;
+
+	catpt_updatel_pci(cdev, VDRTCTL0, mask, new);
+	/* wait for SRAM power gating to propagate */
+	udelay(60);
+
+	/*
+	 * Dummy read as the very first access after block enable
+	 * to prevent byte loss in future operations.
+	 */
+	for_each_clear_bit_from(b, &new, fls_long(mask)) {
+		u8 buf[4];
+
+		/* newly enabled: new bit=0 while old bit=1 */
+		if (test_bit(b, &old)) {
+			dev_dbg(cdev->dev, "sanitize block %ld: off 0x%08x\n",
+				b - __ffs(mask), off);
+			memcpy_fromio(buf, cdev->lpe_ba + off, sizeof(buf));
+		}
+		off += CATPT_MEMBLOCK_SIZE;
+	}
+}
+
+void catpt_dsp_update_srampge(struct catpt_dev *cdev, struct resource *sram,
+			      unsigned long mask)
+{
+	struct resource *res;
+	unsigned long new = 0;
+
+	/* flag all busy blocks */
+	for (res = sram->child; res; res = res->sibling) {
+		u32 h, l;
+
+		h = (res->end - sram->start) / CATPT_MEMBLOCK_SIZE;
+		l = (res->start - sram->start) / CATPT_MEMBLOCK_SIZE;
+		new |= GENMASK(h, l);
+	}
+
+	/* offset value given mask's start and invert it as ON=b0 */
+	new = ~(new << __ffs(mask)) & mask;
+
+	/* disable core clock gating */
+	catpt_updatel_pci(cdev, VDRTCTL2, CATPT_VDRTCTL2_DCLCGE, 0);
+
+	catpt_dsp_set_srampge(cdev, sram, mask, new);
+
+	/* enable core clock gating */
+	catpt_updatel_pci(cdev, VDRTCTL2, CATPT_VDRTCTL2_DCLCGE,
+			  CATPT_VDRTCTL2_DCLCGE);
+}
+
+int catpt_dsp_stall(struct catpt_dev *cdev, bool stall)
+{
+	u32 reg, val;
+
+	val = stall ? CATPT_CS_STALL : 0;
+	catpt_updatel_shim(cdev, CS1, CATPT_CS_STALL, val);
+
+	return catpt_readl_poll_shim(cdev, CS1,
+				     reg, (reg & CATPT_CS_STALL) == val,
+				     500, 10000);
+}
+
+static int catpt_dsp_reset(struct catpt_dev *cdev, bool reset)
+{
+	u32 reg, val;
+
+	val = reset ? CATPT_CS_RST : 0;
+	catpt_updatel_shim(cdev, CS1, CATPT_CS_RST, val);
+
+	return catpt_readl_poll_shim(cdev, CS1,
+				     reg, (reg & CATPT_CS_RST) == val,
+				     500, 10000);
+}
+
+void lpt_dsp_pll_shutdown(struct catpt_dev *cdev, bool enable)
+{
+	u32 val;
+
+	val = enable ? LPT_VDRTCTL0_APLLSE : 0;
+	catpt_updatel_pci(cdev, VDRTCTL0, LPT_VDRTCTL0_APLLSE, val);
+}
+
+void wpt_dsp_pll_shutdown(struct catpt_dev *cdev, bool enable)
+{
+	u32 val;
+
+	val = enable ? WPT_VDRTCTL2_APLLSE : 0;
+	catpt_updatel_pci(cdev, VDRTCTL2, WPT_VDRTCTL2_APLLSE, val);
+}
+
+static int catpt_dsp_select_lpclock(struct catpt_dev *cdev, bool lp, bool waiti)
+{
+	u32 mask, reg, val;
+	int ret;
+
+	mutex_lock(&cdev->clk_mutex);
+
+	val = lp ? CATPT_CS_LPCS : 0;
+	reg = catpt_readl_shim(cdev, CS1) & CATPT_CS_LPCS;
+	dev_dbg(cdev->dev, "LPCS [0x%08lx] 0x%08x -> 0x%08x",
+		CATPT_CS_LPCS, reg, val);
+
+	if (reg == val) {
+		mutex_unlock(&cdev->clk_mutex);
+		return 0;
+	}
+
+	if (waiti) {
+		/* wait for DSP to signal WAIT state */
+		ret = catpt_readl_poll_shim(cdev, ISD,
+					    reg, (reg & CATPT_ISD_DCPWM),
+					    500, 10000);
+		if (ret) {
+			dev_err(cdev->dev, "await WAITI timeout\n");
+			mutex_unlock(&cdev->clk_mutex);
+			return ret;
+		}
+	}
+
+	ret = catpt_readl_poll_shim(cdev, CLKCTL,
+				    reg, !(reg & CATPT_CLKCTL_CFCIP),
+				    500, 10000);
+	if (ret)
+		dev_warn(cdev->dev, "clock change still in progress\n");
+
+	/* default to DSP core & audio fabric high clock */
+	val |= CATPT_CS_DCS_HIGH;
+	mask = CATPT_CS_LPCS | CATPT_CS_DCS;
+	catpt_updatel_shim(cdev, CS1, mask, val);
+
+	ret = catpt_readl_poll_shim(cdev, CLKCTL,
+				    reg, !(reg & CATPT_CLKCTL_CFCIP),
+				    500, 10000);
+	if (ret)
+		dev_warn(cdev->dev, "clock change still in progress\n");
+
+	/* update PLL accordingly */
+	cdev->spec->pll_shutdown(cdev, lp);
+
+	mutex_unlock(&cdev->clk_mutex);
+	return 0;
+}
+
+int catpt_dsp_update_lpclock(struct catpt_dev *cdev)
+{
+	struct catpt_stream_runtime *stream;
+
+	list_for_each_entry(stream, &cdev->stream_list, node)
+		if (stream->prepared)
+			return catpt_dsp_select_lpclock(cdev, false, true);
+
+	return catpt_dsp_select_lpclock(cdev, true, true);
+}
+
+/* bring registers to their defaults as HW won't reset itself */
+static void catpt_dsp_set_regs_defaults(struct catpt_dev *cdev)
+{
+	int i;
+
+	catpt_writel_shim(cdev, CS1, CATPT_CS_DEFAULT);
+	catpt_writel_shim(cdev, ISC, CATPT_ISC_DEFAULT);
+	catpt_writel_shim(cdev, ISD, CATPT_ISD_DEFAULT);
+	catpt_writel_shim(cdev, IMC, CATPT_IMC_DEFAULT);
+	catpt_writel_shim(cdev, IMD, CATPT_IMD_DEFAULT);
+	catpt_writel_shim(cdev, IPCC, CATPT_IPCC_DEFAULT);
+	catpt_writel_shim(cdev, IPCD, CATPT_IPCD_DEFAULT);
+	catpt_writel_shim(cdev, CLKCTL, CATPT_CLKCTL_DEFAULT);
+	catpt_writel_shim(cdev, CS2, CATPT_CS2_DEFAULT);
+	catpt_writel_shim(cdev, LTRC, CATPT_LTRC_DEFAULT);
+	catpt_writel_shim(cdev, HMDC, CATPT_HMDC_DEFAULT);
+
+	for (i = 0; i < CATPT_SSP_COUNT; i++) {
+		catpt_writel_ssp(cdev, i, SSCR0, CATPT_SSC0_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSCR1, CATPT_SSC1_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSSR, CATPT_SSS_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSITR, CATPT_SSIT_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSDR, CATPT_SSD_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSTO, CATPT_SSTO_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSPSP, CATPT_SSPSP_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSTSA, CATPT_SSTSA_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSRSA, CATPT_SSRSA_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSTSS, CATPT_SSTSS_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSCR2, CATPT_SSCR2_DEFAULT);
+		catpt_writel_ssp(cdev, i, SSPSP2, CATPT_SSPSP2_DEFAULT);
+	}
+}
+
+int lpt_dsp_power_down(struct catpt_dev *cdev)
+{
+	catpt_dsp_reset(cdev, true);
+
+	/* set 24Mhz clock for both SSPs */
+	catpt_updatel_shim(cdev, CS1, CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1),
+			   CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1));
+	catpt_dsp_select_lpclock(cdev, true, false);
+
+	/* DRAM power gating all */
+	catpt_dsp_set_srampge(cdev, &cdev->dram, cdev->spec->dram_mask,
+			      cdev->spec->dram_mask);
+	catpt_dsp_set_srampge(cdev, &cdev->iram, cdev->spec->iram_mask,
+			      cdev->spec->iram_mask);
+
+	catpt_updatel_pci(cdev, PMCS, PCI_PM_CTRL_STATE_MASK, PCI_D3hot);
+	/* give hw time to drop off */
+	udelay(50);
+
+	return 0;
+}
+
+int lpt_dsp_power_up(struct catpt_dev *cdev)
+{
+	/* SRAM power gating none */
+	catpt_dsp_set_srampge(cdev, &cdev->dram, cdev->spec->dram_mask, 0);
+	catpt_dsp_set_srampge(cdev, &cdev->iram, cdev->spec->iram_mask, 0);
+
+	catpt_updatel_pci(cdev, PMCS, PCI_PM_CTRL_STATE_MASK, PCI_D0);
+	/* give hw time to wake up */
+	udelay(100);
+
+	catpt_dsp_select_lpclock(cdev, false, false);
+	catpt_updatel_shim(cdev, CS1,
+			   CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1),
+			   CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1));
+	/* stagger DSP reset after clock selection */
+	udelay(50);
+
+	catpt_dsp_reset(cdev, false);
+	/* generate int deassert msg to fix inversed int logic */
+	catpt_updatel_shim(cdev, IMC, CATPT_IMC_IPCDB | CATPT_IMC_IPCCD, 0);
+
+	return 0;
+}
+
+int wpt_dsp_power_down(struct catpt_dev *cdev)
+{
+	u32 mask, val;
+
+	/* disable core clock gating */
+	catpt_updatel_pci(cdev, VDRTCTL2, CATPT_VDRTCTL2_DCLCGE, 0);
+
+	catpt_dsp_reset(cdev, true);
+	/* set 24Mhz clock for both SSPs */
+	catpt_updatel_shim(cdev, CS1, CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1),
+			   CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1));
+	catpt_dsp_select_lpclock(cdev, true, false);
+	/* disable MCLK */
+	catpt_updatel_shim(cdev, CLKCTL, CATPT_CLKCTL_SMOS, 0);
+
+	catpt_dsp_set_regs_defaults(cdev);
+
+	/* switch clock gating */
+	mask = CATPT_VDRTCTL2_CGEALL & (~CATPT_VDRTCTL2_DCLCGE);
+	val = mask & (~CATPT_VDRTCTL2_DTCGE);
+	catpt_updatel_pci(cdev, VDRTCTL2, mask, val);
+	/* enable DTCGE separatelly */
+	catpt_updatel_pci(cdev, VDRTCTL2, CATPT_VDRTCTL2_DTCGE,
+			  CATPT_VDRTCTL2_DTCGE);
+
+	/* SRAM power gating all */
+	catpt_dsp_set_srampge(cdev, &cdev->dram, cdev->spec->dram_mask,
+			      cdev->spec->dram_mask);
+	catpt_dsp_set_srampge(cdev, &cdev->iram, cdev->spec->iram_mask,
+			      cdev->spec->iram_mask);
+	mask = WPT_VDRTCTL0_D3SRAMPGD | WPT_VDRTCTL0_D3PGD;
+	catpt_updatel_pci(cdev, VDRTCTL0, mask, WPT_VDRTCTL0_D3PGD);
+
+	catpt_updatel_pci(cdev, PMCS, PCI_PM_CTRL_STATE_MASK, PCI_D3hot);
+	/* give hw time to drop off */
+	udelay(50);
+
+	/* enable core clock gating */
+	catpt_updatel_pci(cdev, VDRTCTL2, CATPT_VDRTCTL2_DCLCGE,
+			  CATPT_VDRTCTL2_DCLCGE);
+	udelay(50);
+
+	return 0;
+}
+
+int wpt_dsp_power_up(struct catpt_dev *cdev)
+{
+	u32 mask, val;
+
+	/* disable core clock gating */
+	catpt_updatel_pci(cdev, VDRTCTL2, CATPT_VDRTCTL2_DCLCGE, 0);
+
+	/* switch clock gating */
+	mask = CATPT_VDRTCTL2_CGEALL & (~CATPT_VDRTCTL2_DCLCGE);
+	val = mask & (~CATPT_VDRTCTL2_DTCGE);
+	catpt_updatel_pci(cdev, VDRTCTL2, mask, val);
+
+	catpt_updatel_pci(cdev, PMCS, PCI_PM_CTRL_STATE_MASK, PCI_D0);
+
+	/* SRAM power gating none */
+	mask = WPT_VDRTCTL0_D3SRAMPGD | WPT_VDRTCTL0_D3PGD;
+	catpt_updatel_pci(cdev, VDRTCTL0, mask, mask);
+	catpt_dsp_set_srampge(cdev, &cdev->dram, cdev->spec->dram_mask, 0);
+	catpt_dsp_set_srampge(cdev, &cdev->iram, cdev->spec->iram_mask, 0);
+
+	catpt_dsp_set_regs_defaults(cdev);
+
+	/* restore MCLK */
+	catpt_updatel_shim(cdev, CLKCTL, CATPT_CLKCTL_SMOS, CATPT_CLKCTL_SMOS);
+	catpt_dsp_select_lpclock(cdev, false, false);
+	/* set 24Mhz clock for both SSPs */
+	catpt_updatel_shim(cdev, CS1, CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1),
+			   CATPT_CS_SBCS(0) | CATPT_CS_SBCS(1));
+	catpt_dsp_reset(cdev, false);
+
+	/* enable core clock gating */
+	catpt_updatel_pci(cdev, VDRTCTL2, CATPT_VDRTCTL2_DCLCGE,
+			  CATPT_VDRTCTL2_DCLCGE);
+
+	/* generate int deassert msg to fix inversed int logic */
+	catpt_updatel_shim(cdev, IMC, CATPT_IMC_IPCDB | CATPT_IMC_IPCCD, 0);
+
+	return 0;
+}
+
 #define CATPT_DUMP_MAGIC		0xcd42
 #define CATPT_DUMP_SECTION_ID_FILE	0x00
 #define CATPT_DUMP_SECTION_ID_IRAM	0x01