summaryrefslogtreecommitdiff
path: root/drivers/usb/otg/twl4030-usb.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/usb/otg/twl4030-usb.c')
-rw-r--r--drivers/usb/otg/twl4030-usb.c721
1 files changed, 721 insertions, 0 deletions
diff --git a/drivers/usb/otg/twl4030-usb.c b/drivers/usb/otg/twl4030-usb.c
new file mode 100644
index 000000000000..416e4410be02
--- /dev/null
+++ b/drivers/usb/otg/twl4030-usb.c
@@ -0,0 +1,721 @@
+/*
+ * twl4030_usb - TWL4030 USB transceiver, talking to OMAP OTG controller
+ *
+ * Copyright (C) 2004-2007 Texas Instruments
+ * Copyright (C) 2008 Nokia Corporation
+ * Contact: Felipe Balbi <felipe.balbi@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Current status:
+ * - HS USB ULPI mode works.
+ * - 3-pin mode support may be added in future.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/usb/otg.h>
+#include <linux/i2c/twl4030.h>
+
+
+/* Register defines */
+
+#define VENDOR_ID_LO 0x00
+#define VENDOR_ID_HI 0x01
+#define PRODUCT_ID_LO 0x02
+#define PRODUCT_ID_HI 0x03
+
+#define FUNC_CTRL 0x04
+#define FUNC_CTRL_SET 0x05
+#define FUNC_CTRL_CLR 0x06
+#define FUNC_CTRL_SUSPENDM (1 << 6)
+#define FUNC_CTRL_RESET (1 << 5)
+#define FUNC_CTRL_OPMODE_MASK (3 << 3) /* bits 3 and 4 */
+#define FUNC_CTRL_OPMODE_NORMAL (0 << 3)
+#define FUNC_CTRL_OPMODE_NONDRIVING (1 << 3)
+#define FUNC_CTRL_OPMODE_DISABLE_BIT_NRZI (2 << 3)
+#define FUNC_CTRL_TERMSELECT (1 << 2)
+#define FUNC_CTRL_XCVRSELECT_MASK (3 << 0) /* bits 0 and 1 */
+#define FUNC_CTRL_XCVRSELECT_HS (0 << 0)
+#define FUNC_CTRL_XCVRSELECT_FS (1 << 0)
+#define FUNC_CTRL_XCVRSELECT_LS (2 << 0)
+#define FUNC_CTRL_XCVRSELECT_FS4LS (3 << 0)
+
+#define IFC_CTRL 0x07
+#define IFC_CTRL_SET 0x08
+#define IFC_CTRL_CLR 0x09
+#define IFC_CTRL_INTERFACE_PROTECT_DISABLE (1 << 7)
+#define IFC_CTRL_AUTORESUME (1 << 4)
+#define IFC_CTRL_CLOCKSUSPENDM (1 << 3)
+#define IFC_CTRL_CARKITMODE (1 << 2)
+#define IFC_CTRL_FSLSSERIALMODE_3PIN (1 << 1)
+
+#define TWL4030_OTG_CTRL 0x0A
+#define TWL4030_OTG_CTRL_SET 0x0B
+#define TWL4030_OTG_CTRL_CLR 0x0C
+#define TWL4030_OTG_CTRL_DRVVBUS (1 << 5)
+#define TWL4030_OTG_CTRL_CHRGVBUS (1 << 4)
+#define TWL4030_OTG_CTRL_DISCHRGVBUS (1 << 3)
+#define TWL4030_OTG_CTRL_DMPULLDOWN (1 << 2)
+#define TWL4030_OTG_CTRL_DPPULLDOWN (1 << 1)
+#define TWL4030_OTG_CTRL_IDPULLUP (1 << 0)
+
+#define USB_INT_EN_RISE 0x0D
+#define USB_INT_EN_RISE_SET 0x0E
+#define USB_INT_EN_RISE_CLR 0x0F
+#define USB_INT_EN_FALL 0x10
+#define USB_INT_EN_FALL_SET 0x11
+#define USB_INT_EN_FALL_CLR 0x12
+#define USB_INT_STS 0x13
+#define USB_INT_LATCH 0x14
+#define USB_INT_IDGND (1 << 4)
+#define USB_INT_SESSEND (1 << 3)
+#define USB_INT_SESSVALID (1 << 2)
+#define USB_INT_VBUSVALID (1 << 1)
+#define USB_INT_HOSTDISCONNECT (1 << 0)
+
+#define CARKIT_CTRL 0x19
+#define CARKIT_CTRL_SET 0x1A
+#define CARKIT_CTRL_CLR 0x1B
+#define CARKIT_CTRL_MICEN (1 << 6)
+#define CARKIT_CTRL_SPKRIGHTEN (1 << 5)
+#define CARKIT_CTRL_SPKLEFTEN (1 << 4)
+#define CARKIT_CTRL_RXDEN (1 << 3)
+#define CARKIT_CTRL_TXDEN (1 << 2)
+#define CARKIT_CTRL_IDGNDDRV (1 << 1)
+#define CARKIT_CTRL_CARKITPWR (1 << 0)
+#define CARKIT_PLS_CTRL 0x22
+#define CARKIT_PLS_CTRL_SET 0x23
+#define CARKIT_PLS_CTRL_CLR 0x24
+#define CARKIT_PLS_CTRL_SPKRRIGHT_BIASEN (1 << 3)
+#define CARKIT_PLS_CTRL_SPKRLEFT_BIASEN (1 << 2)
+#define CARKIT_PLS_CTRL_RXPLSEN (1 << 1)
+#define CARKIT_PLS_CTRL_TXPLSEN (1 << 0)
+
+#define MCPC_CTRL 0x30
+#define MCPC_CTRL_SET 0x31
+#define MCPC_CTRL_CLR 0x32
+#define MCPC_CTRL_RTSOL (1 << 7)
+#define MCPC_CTRL_EXTSWR (1 << 6)
+#define MCPC_CTRL_EXTSWC (1 << 5)
+#define MCPC_CTRL_VOICESW (1 << 4)
+#define MCPC_CTRL_OUT64K (1 << 3)
+#define MCPC_CTRL_RTSCTSSW (1 << 2)
+#define MCPC_CTRL_HS_UART (1 << 0)
+
+#define MCPC_IO_CTRL 0x33
+#define MCPC_IO_CTRL_SET 0x34
+#define MCPC_IO_CTRL_CLR 0x35
+#define MCPC_IO_CTRL_MICBIASEN (1 << 5)
+#define MCPC_IO_CTRL_CTS_NPU (1 << 4)
+#define MCPC_IO_CTRL_RXD_PU (1 << 3)
+#define MCPC_IO_CTRL_TXDTYP (1 << 2)
+#define MCPC_IO_CTRL_CTSTYP (1 << 1)
+#define MCPC_IO_CTRL_RTSTYP (1 << 0)
+
+#define MCPC_CTRL2 0x36
+#define MCPC_CTRL2_SET 0x37
+#define MCPC_CTRL2_CLR 0x38
+#define MCPC_CTRL2_MCPC_CK_EN (1 << 0)
+
+#define OTHER_FUNC_CTRL 0x80
+#define OTHER_FUNC_CTRL_SET 0x81
+#define OTHER_FUNC_CTRL_CLR 0x82
+#define OTHER_FUNC_CTRL_BDIS_ACON_EN (1 << 4)
+#define OTHER_FUNC_CTRL_FIVEWIRE_MODE (1 << 2)
+
+#define OTHER_IFC_CTRL 0x83
+#define OTHER_IFC_CTRL_SET 0x84
+#define OTHER_IFC_CTRL_CLR 0x85
+#define OTHER_IFC_CTRL_OE_INT_EN (1 << 6)
+#define OTHER_IFC_CTRL_CEA2011_MODE (1 << 5)
+#define OTHER_IFC_CTRL_FSLSSERIALMODE_4PIN (1 << 4)
+#define OTHER_IFC_CTRL_HIZ_ULPI_60MHZ_OUT (1 << 3)
+#define OTHER_IFC_CTRL_HIZ_ULPI (1 << 2)
+#define OTHER_IFC_CTRL_ALT_INT_REROUTE (1 << 0)
+
+#define OTHER_INT_EN_RISE 0x86
+#define OTHER_INT_EN_RISE_SET 0x87
+#define OTHER_INT_EN_RISE_CLR 0x88
+#define OTHER_INT_EN_FALL 0x89
+#define OTHER_INT_EN_FALL_SET 0x8A
+#define OTHER_INT_EN_FALL_CLR 0x8B
+#define OTHER_INT_STS 0x8C
+#define OTHER_INT_LATCH 0x8D
+#define OTHER_INT_VB_SESS_VLD (1 << 7)
+#define OTHER_INT_DM_HI (1 << 6) /* not valid for "latch" reg */
+#define OTHER_INT_DP_HI (1 << 5) /* not valid for "latch" reg */
+#define OTHER_INT_BDIS_ACON (1 << 3) /* not valid for "fall" regs */
+#define OTHER_INT_MANU (1 << 1)
+#define OTHER_INT_ABNORMAL_STRESS (1 << 0)
+
+#define ID_STATUS 0x96
+#define ID_RES_FLOAT (1 << 4)
+#define ID_RES_440K (1 << 3)
+#define ID_RES_200K (1 << 2)
+#define ID_RES_102K (1 << 1)
+#define ID_RES_GND (1 << 0)
+
+#define POWER_CTRL 0xAC
+#define POWER_CTRL_SET 0xAD
+#define POWER_CTRL_CLR 0xAE
+#define POWER_CTRL_OTG_ENAB (1 << 5)
+
+#define OTHER_IFC_CTRL2 0xAF
+#define OTHER_IFC_CTRL2_SET 0xB0
+#define OTHER_IFC_CTRL2_CLR 0xB1
+#define OTHER_IFC_CTRL2_ULPI_STP_LOW (1 << 4)
+#define OTHER_IFC_CTRL2_ULPI_TXEN_POL (1 << 3)
+#define OTHER_IFC_CTRL2_ULPI_4PIN_2430 (1 << 2)
+#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_MASK (3 << 0) /* bits 0 and 1 */
+#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT1N (0 << 0)
+#define OTHER_IFC_CTRL2_USB_INT_OUTSEL_INT2N (1 << 0)
+
+#define REG_CTRL_EN 0xB2
+#define REG_CTRL_EN_SET 0xB3
+#define REG_CTRL_EN_CLR 0xB4
+#define REG_CTRL_ERROR 0xB5
+#define ULPI_I2C_CONFLICT_INTEN (1 << 0)
+
+#define OTHER_FUNC_CTRL2 0xB8
+#define OTHER_FUNC_CTRL2_SET 0xB9
+#define OTHER_FUNC_CTRL2_CLR 0xBA
+#define OTHER_FUNC_CTRL2_VBAT_TIMER_EN (1 << 0)
+
+/* following registers do not have separate _clr and _set registers */
+#define VBUS_DEBOUNCE 0xC0
+#define ID_DEBOUNCE 0xC1
+#define VBAT_TIMER 0xD3
+#define PHY_PWR_CTRL 0xFD
+#define PHY_PWR_PHYPWD (1 << 0)
+#define PHY_CLK_CTRL 0xFE
+#define PHY_CLK_CTRL_CLOCKGATING_EN (1 << 2)
+#define PHY_CLK_CTRL_CLK32K_EN (1 << 1)
+#define REQ_PHY_DPLL_CLK (1 << 0)
+#define PHY_CLK_CTRL_STS 0xFF
+#define PHY_DPLL_CLK (1 << 0)
+
+/* In module TWL4030_MODULE_PM_MASTER */
+#define PROTECT_KEY 0x0E
+
+/* In module TWL4030_MODULE_PM_RECEIVER */
+#define VUSB_DEDICATED1 0x7D
+#define VUSB_DEDICATED2 0x7E
+#define VUSB1V5_DEV_GRP 0x71
+#define VUSB1V5_TYPE 0x72
+#define VUSB1V5_REMAP 0x73
+#define VUSB1V8_DEV_GRP 0x74
+#define VUSB1V8_TYPE 0x75
+#define VUSB1V8_REMAP 0x76
+#define VUSB3V1_DEV_GRP 0x77
+#define VUSB3V1_TYPE 0x78
+#define VUSB3V1_REMAP 0x79
+
+/* In module TWL4030_MODULE_INTBR */
+#define PMBR1 0x0D
+#define GPIO_USB_4PIN_ULPI_2430C (3 << 0)
+
+
+
+enum linkstat {
+ USB_LINK_UNKNOWN = 0,
+ USB_LINK_NONE,
+ USB_LINK_VBUS,
+ USB_LINK_ID,
+};
+
+struct twl4030_usb {
+ struct otg_transceiver otg;
+ struct device *dev;
+
+ /* for vbus reporting with irqs disabled */
+ spinlock_t lock;
+
+ /* pin configuration */
+ enum twl4030_usb_mode usb_mode;
+
+ int irq;
+ u8 linkstat;
+ u8 asleep;
+ bool irq_enabled;
+};
+
+/* internal define on top of container_of */
+#define xceiv_to_twl(x) container_of((x), struct twl4030_usb, otg);
+
+/*-------------------------------------------------------------------------*/
+
+static int twl4030_i2c_write_u8_verify(struct twl4030_usb *twl,
+ u8 module, u8 data, u8 address)
+{
+ u8 check;
+
+ if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
+ (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
+ (check == data))
+ return 0;
+ dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
+ 1, module, address, check, data);
+
+ /* Failed once: Try again */
+ if ((twl4030_i2c_write_u8(module, data, address) >= 0) &&
+ (twl4030_i2c_read_u8(module, &check, address) >= 0) &&
+ (check == data))
+ return 0;
+ dev_dbg(twl->dev, "Write%d[%d,0x%x] wrote %02x but read %02x\n",
+ 2, module, address, check, data);
+
+ /* Failed again: Return error */
+ return -EBUSY;
+}
+
+#define twl4030_usb_write_verify(twl, address, data) \
+ twl4030_i2c_write_u8_verify(twl, TWL4030_MODULE_USB, (data), (address))
+
+static inline int twl4030_usb_write(struct twl4030_usb *twl,
+ u8 address, u8 data)
+{
+ int ret = 0;
+
+ ret = twl4030_i2c_write_u8(TWL4030_MODULE_USB, data, address);
+ if (ret < 0)
+ dev_dbg(twl->dev,
+ "TWL4030:USB:Write[0x%x] Error %d\n", address, ret);
+ return ret;
+}
+
+static inline int twl4030_readb(struct twl4030_usb *twl, u8 module, u8 address)
+{
+ u8 data;
+ int ret = 0;
+
+ ret = twl4030_i2c_read_u8(module, &data, address);
+ if (ret >= 0)
+ ret = data;
+ else
+ dev_dbg(twl->dev,
+ "TWL4030:readb[0x%x,0x%x] Error %d\n",
+ module, address, ret);
+
+ return ret;
+}
+
+static inline int twl4030_usb_read(struct twl4030_usb *twl, u8 address)
+{
+ return twl4030_readb(twl, TWL4030_MODULE_USB, address);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static inline int
+twl4030_usb_set_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
+{
+ return twl4030_usb_write(twl, reg + 1, bits);
+}
+
+static inline int
+twl4030_usb_clear_bits(struct twl4030_usb *twl, u8 reg, u8 bits)
+{
+ return twl4030_usb_write(twl, reg + 2, bits);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static enum linkstat twl4030_usb_linkstat(struct twl4030_usb *twl)
+{
+ int status;
+ int linkstat = USB_LINK_UNKNOWN;
+
+ /* STS_HW_CONDITIONS */
+ status = twl4030_readb(twl, TWL4030_MODULE_PM_MASTER, 0x0f);
+ if (status < 0)
+ dev_err(twl->dev, "USB link status err %d\n", status);
+ else if (status & BIT(7))
+ linkstat = USB_LINK_VBUS;
+ else if (status & BIT(2))
+ linkstat = USB_LINK_ID;
+ else
+ linkstat = USB_LINK_NONE;
+
+ dev_dbg(twl->dev, "HW_CONDITIONS 0x%02x/%d; link %d\n",
+ status, status, linkstat);
+
+ /* REVISIT this assumes host and peripheral controllers
+ * are registered, and that both are active...
+ */
+
+ spin_lock_irq(&twl->lock);
+ twl->linkstat = linkstat;
+ if (linkstat == USB_LINK_ID) {
+ twl->otg.default_a = true;
+ twl->otg.state = OTG_STATE_A_IDLE;
+ } else {
+ twl->otg.default_a = false;
+ twl->otg.state = OTG_STATE_B_IDLE;
+ }
+ spin_unlock_irq(&twl->lock);
+
+ return linkstat;
+}
+
+static void twl4030_usb_set_mode(struct twl4030_usb *twl, int mode)
+{
+ twl->usb_mode = mode;
+
+ switch (mode) {
+ case T2_USB_MODE_ULPI:
+ twl4030_usb_clear_bits(twl, IFC_CTRL, IFC_CTRL_CARKITMODE);
+ twl4030_usb_set_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
+ twl4030_usb_clear_bits(twl, FUNC_CTRL,
+ FUNC_CTRL_XCVRSELECT_MASK |
+ FUNC_CTRL_OPMODE_MASK);
+ break;
+ case -1:
+ /* FIXME: power on defaults */
+ break;
+ default:
+ dev_err(twl->dev, "unsupported T2 transceiver mode %d\n",
+ mode);
+ break;
+ };
+}
+
+static void twl4030_i2c_access(struct twl4030_usb *twl, int on)
+{
+ unsigned long timeout;
+ int val = twl4030_usb_read(twl, PHY_CLK_CTRL);
+
+ if (val >= 0) {
+ if (on) {
+ /* enable DPLL to access PHY registers over I2C */
+ val |= REQ_PHY_DPLL_CLK;
+ WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
+ (u8)val) < 0);
+
+ timeout = jiffies + HZ;
+ while (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
+ PHY_DPLL_CLK)
+ && time_before(jiffies, timeout))
+ udelay(10);
+ if (!(twl4030_usb_read(twl, PHY_CLK_CTRL_STS) &
+ PHY_DPLL_CLK))
+ dev_err(twl->dev, "Timeout setting T2 HSUSB "
+ "PHY DPLL clock\n");
+ } else {
+ /* let ULPI control the DPLL clock */
+ val &= ~REQ_PHY_DPLL_CLK;
+ WARN_ON(twl4030_usb_write_verify(twl, PHY_CLK_CTRL,
+ (u8)val) < 0);
+ }
+ }
+}
+
+static void twl4030_phy_power(struct twl4030_usb *twl, int on)
+{
+ u8 pwr;
+
+ pwr = twl4030_usb_read(twl, PHY_PWR_CTRL);
+ if (on) {
+ pwr &= ~PHY_PWR_PHYPWD;
+ WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
+ twl4030_usb_write(twl, PHY_CLK_CTRL,
+ twl4030_usb_read(twl, PHY_CLK_CTRL) |
+ (PHY_CLK_CTRL_CLOCKGATING_EN |
+ PHY_CLK_CTRL_CLK32K_EN));
+ } else {
+ pwr |= PHY_PWR_PHYPWD;
+ WARN_ON(twl4030_usb_write_verify(twl, PHY_PWR_CTRL, pwr) < 0);
+ }
+}
+
+static void twl4030_phy_suspend(struct twl4030_usb *twl, int controller_off)
+{
+ if (twl->asleep)
+ return;
+
+ twl4030_phy_power(twl, 0);
+ twl->asleep = 1;
+}
+
+static void twl4030_phy_resume(struct twl4030_usb *twl)
+{
+ if (!twl->asleep)
+ return;
+
+ twl4030_phy_power(twl, 1);
+ twl4030_i2c_access(twl, 1);
+ twl4030_usb_set_mode(twl, twl->usb_mode);
+ if (twl->usb_mode == T2_USB_MODE_ULPI)
+ twl4030_i2c_access(twl, 0);
+ twl->asleep = 0;
+}
+
+static void twl4030_usb_ldo_init(struct twl4030_usb *twl)
+{
+ /* Enable writing to power configuration registers */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0xC0, PROTECT_KEY);
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0x0C, PROTECT_KEY);
+
+ /* put VUSB3V1 LDO in active state */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB_DEDICATED2);
+
+ /* input to VUSB3V1 LDO is from VBAT, not VBUS */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x14, VUSB_DEDICATED1);
+
+ /* turn on 3.1V regulator */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB3V1_DEV_GRP);
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB3V1_TYPE);
+
+ /* turn on 1.5V regulator */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V5_DEV_GRP);
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V5_TYPE);
+
+ /* turn on 1.8V regulator */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0x20, VUSB1V8_DEV_GRP);
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, 0, VUSB1V8_TYPE);
+
+ /* disable access to power configuration registers */
+ twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, 0, PROTECT_KEY);
+}
+
+static ssize_t twl4030_usb_vbus_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct twl4030_usb *twl = dev_get_drvdata(dev);
+ unsigned long flags;
+ int ret = -EINVAL;
+
+ spin_lock_irqsave(&twl->lock, flags);
+ ret = sprintf(buf, "%s\n",
+ (twl->linkstat == USB_LINK_VBUS) ? "on" : "off");
+ spin_unlock_irqrestore(&twl->lock, flags);
+
+ return ret;
+}
+static DEVICE_ATTR(vbus, 0444, twl4030_usb_vbus_show, NULL);
+
+static irqreturn_t twl4030_usb_irq(int irq, void *_twl)
+{
+ struct twl4030_usb *twl = _twl;
+ int status;
+
+#ifdef CONFIG_LOCKDEP
+ /* WORKAROUND for lockdep forcing IRQF_DISABLED on us, which
+ * we don't want and can't tolerate. Although it might be
+ * friendlier not to borrow this thread context...
+ */
+ local_irq_enable();
+#endif
+
+ status = twl4030_usb_linkstat(twl);
+ if (status != USB_LINK_UNKNOWN) {
+
+ /* FIXME add a set_power() method so that B-devices can
+ * configure the charger appropriately. It's not always
+ * correct to consume VBUS power, and how much current to
+ * consume is a function of the USB configuration chosen
+ * by the host.
+ *
+ * REVISIT usb_gadget_vbus_connect(...) as needed, ditto
+ * its disconnect() sibling, when changing to/from the
+ * USB_LINK_VBUS state. musb_hdrc won't care until it
+ * starts to handle softconnect right.
+ */
+ twl4030charger_usb_en(status == USB_LINK_VBUS);
+
+ if (status == USB_LINK_NONE)
+ twl4030_phy_suspend(twl, 0);
+ else
+ twl4030_phy_resume(twl);
+ }
+ sysfs_notify(&twl->dev->kobj, NULL, "vbus");
+
+ return IRQ_HANDLED;
+}
+
+static int twl4030_set_suspend(struct otg_transceiver *x, int suspend)
+{
+ struct twl4030_usb *twl = xceiv_to_twl(x);
+
+ if (suspend)
+ twl4030_phy_suspend(twl, 1);
+ else
+ twl4030_phy_resume(twl);
+
+ return 0;
+}
+
+static int twl4030_set_peripheral(struct otg_transceiver *x,
+ struct usb_gadget *gadget)
+{
+ struct twl4030_usb *twl;
+
+ if (!x)
+ return -ENODEV;
+
+ twl = xceiv_to_twl(x);
+ twl->otg.gadget = gadget;
+ if (!gadget)
+ twl->otg.state = OTG_STATE_UNDEFINED;
+
+ return 0;
+}
+
+static int twl4030_set_host(struct otg_transceiver *x, struct usb_bus *host)
+{
+ struct twl4030_usb *twl;
+
+ if (!x)
+ return -ENODEV;
+
+ twl = xceiv_to_twl(x);
+ twl->otg.host = host;
+ if (!host)
+ twl->otg.state = OTG_STATE_UNDEFINED;
+
+ return 0;
+}
+
+static int __init twl4030_usb_probe(struct platform_device *pdev)
+{
+ struct twl4030_usb_data *pdata = pdev->dev.platform_data;
+ struct twl4030_usb *twl;
+ int status;
+
+ if (!pdata) {
+ dev_dbg(&pdev->dev, "platform_data not available\n");
+ return -EINVAL;
+ }
+
+ twl = kzalloc(sizeof *twl, GFP_KERNEL);
+ if (!twl)
+ return -ENOMEM;
+
+ twl->dev = &pdev->dev;
+ twl->irq = platform_get_irq(pdev, 0);
+ twl->otg.dev = twl->dev;
+ twl->otg.label = "twl4030";
+ twl->otg.set_host = twl4030_set_host;
+ twl->otg.set_peripheral = twl4030_set_peripheral;
+ twl->otg.set_suspend = twl4030_set_suspend;
+ twl->usb_mode = pdata->usb_mode;
+ twl->asleep = 1;
+
+ /* init spinlock for workqueue */
+ spin_lock_init(&twl->lock);
+
+ twl4030_usb_ldo_init(twl);
+ otg_set_transceiver(&twl->otg);
+
+ platform_set_drvdata(pdev, twl);
+ if (device_create_file(&pdev->dev, &dev_attr_vbus))
+ dev_warn(&pdev->dev, "could not create sysfs file\n");
+
+ /* Our job is to use irqs and status from the power module
+ * to keep the transceiver disabled when nothing's connected.
+ *
+ * FIXME we actually shouldn't start enabling it until the
+ * USB controller drivers have said they're ready, by calling
+ * set_host() and/or set_peripheral() ... OTG_capable boards
+ * need both handles, otherwise just one suffices.
+ */
+ twl->irq_enabled = true;
+ status = request_irq(twl->irq, twl4030_usb_irq,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "twl4030_usb", twl);
+ if (status < 0) {
+ dev_dbg(&pdev->dev, "can't get IRQ %d, err %d\n",
+ twl->irq, status);
+ kfree(twl);
+ return status;
+ }
+
+ /* The IRQ handler just handles changes from the previous states
+ * of the ID and VBUS pins ... in probe() we must initialize that
+ * previous state. The easy way: fake an IRQ.
+ *
+ * REVISIT: a real IRQ might have happened already, if PREEMPT is
+ * enabled. Else the IRQ may not yet be configured or enabled,
+ * because of scheduling delays.
+ */
+ twl4030_usb_irq(twl->irq, twl);
+
+ dev_info(&pdev->dev, "Initialized TWL4030 USB module\n");
+ return 0;
+}
+
+static int __exit twl4030_usb_remove(struct platform_device *pdev)
+{
+ struct twl4030_usb *twl = platform_get_drvdata(pdev);
+ int val;
+
+ free_irq(twl->irq, twl);
+ device_remove_file(twl->dev, &dev_attr_vbus);
+
+ /* set transceiver mode to power on defaults */
+ twl4030_usb_set_mode(twl, -1);
+
+ /* autogate 60MHz ULPI clock,
+ * clear dpll clock request for i2c access,
+ * disable 32KHz
+ */
+ val = twl4030_usb_read(twl, PHY_CLK_CTRL);
+ if (val >= 0) {
+ val |= PHY_CLK_CTRL_CLOCKGATING_EN;
+ val &= ~(PHY_CLK_CTRL_CLK32K_EN | REQ_PHY_DPLL_CLK);
+ twl4030_usb_write(twl, PHY_CLK_CTRL, (u8)val);
+ }
+
+ /* disable complete OTG block */
+ twl4030_usb_clear_bits(twl, POWER_CTRL, POWER_CTRL_OTG_ENAB);
+
+ twl4030_phy_power(twl, 0);
+
+ kfree(twl);
+
+ return 0;
+}
+
+static struct platform_driver twl4030_usb_driver = {
+ .probe = twl4030_usb_probe,
+ .remove = __exit_p(twl4030_usb_remove),
+ .driver = {
+ .name = "twl4030_usb",
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init twl4030_usb_init(void)
+{
+ return platform_driver_register(&twl4030_usb_driver);
+}
+subsys_initcall(twl4030_usb_init);
+
+static void __exit twl4030_usb_exit(void)
+{
+ platform_driver_unregister(&twl4030_usb_driver);
+}
+module_exit(twl4030_usb_exit);
+
+MODULE_ALIAS("platform:twl4030_usb");
+MODULE_AUTHOR("Texas Instruments, Inc, Nokia Corporation");
+MODULE_DESCRIPTION("TWL4030 USB transceiver driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-15 23:05:02 +0000