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linux/drivers/usb/otg/msm_otg.c
Mark Brown e99c4309fb USB: OTG: msm: Free VCCCX regulator even if we can't set the voltage 
If for some reason we fail to set the voltage range for the VDDCX regulator
when removing it's better to still disable and free the regulator as that
avoids leaking a reference to it and is likely to ensure that it's turned
off completely.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-17 11:20:23 -07:00

1762 lines
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/* Copyright (c) 2009-2011, Code Aurora Forum. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include <linux/module.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/uaccess.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/pm_runtime.h>
#include <linux/usb.h>
#include <linux/usb/otg.h>
#include <linux/usb/ulpi.h>
#include <linux/usb/gadget.h>
#include <linux/usb/hcd.h>
#include <linux/usb/msm_hsusb.h>
#include <linux/usb/msm_hsusb_hw.h>
#include <linux/regulator/consumer.h>
#include <mach/clk.h>
#define MSM_USB_BASE (motg->regs)
#define DRIVER_NAME "msm_otg"
#define ULPI_IO_TIMEOUT_USEC (10 * 1000)
#define USB_PHY_3P3_VOL_MIN 3050000 /* uV */
#define USB_PHY_3P3_VOL_MAX 3300000 /* uV */
#define USB_PHY_3P3_HPM_LOAD 50000 /* uA */
#define USB_PHY_3P3_LPM_LOAD 4000 /* uA */
#define USB_PHY_1P8_VOL_MIN 1800000 /* uV */
#define USB_PHY_1P8_VOL_MAX 1800000 /* uV */
#define USB_PHY_1P8_HPM_LOAD 50000 /* uA */
#define USB_PHY_1P8_LPM_LOAD 4000 /* uA */
#define USB_PHY_VDD_DIG_VOL_MIN 1000000 /* uV */
#define USB_PHY_VDD_DIG_VOL_MAX 1320000 /* uV */
static struct regulator *hsusb_3p3;
static struct regulator *hsusb_1p8;
static struct regulator *hsusb_vddcx;
static int msm_hsusb_init_vddcx(struct msm_otg *motg, int init)
{
int ret = 0;
if (init) {
hsusb_vddcx = regulator_get(motg->otg.dev, "HSUSB_VDDCX");
if (IS_ERR(hsusb_vddcx)) {
dev_err(motg->otg.dev, "unable to get hsusb vddcx\n");
return PTR_ERR(hsusb_vddcx);
}
ret = regulator_set_voltage(hsusb_vddcx,
USB_PHY_VDD_DIG_VOL_MIN,
USB_PHY_VDD_DIG_VOL_MAX);
if (ret) {
dev_err(motg->otg.dev, "unable to set the voltage "
"for hsusb vddcx\n");
regulator_put(hsusb_vddcx);
return ret;
}
ret = regulator_enable(hsusb_vddcx);
if (ret) {
dev_err(motg->otg.dev, "unable to enable hsusb vddcx\n");
regulator_put(hsusb_vddcx);
}
} else {
ret = regulator_set_voltage(hsusb_vddcx, 0,
USB_PHY_VDD_DIG_VOL_MAX);
if (ret)
dev_err(motg->otg.dev, "unable to set the voltage "
"for hsusb vddcx\n");
ret = regulator_disable(hsusb_vddcx);
if (ret)
dev_err(motg->otg.dev, "unable to disable hsusb vddcx\n");
regulator_put(hsusb_vddcx);
}
return ret;
}
static int msm_hsusb_ldo_init(struct msm_otg *motg, int init)
{
int rc = 0;
if (init) {
hsusb_3p3 = regulator_get(motg->otg.dev, "HSUSB_3p3");
if (IS_ERR(hsusb_3p3)) {
dev_err(motg->otg.dev, "unable to get hsusb 3p3\n");
return PTR_ERR(hsusb_3p3);
}
rc = regulator_set_voltage(hsusb_3p3, USB_PHY_3P3_VOL_MIN,
USB_PHY_3P3_VOL_MAX);
if (rc) {
dev_err(motg->otg.dev, "unable to set voltage level "
"for hsusb 3p3\n");
goto put_3p3;
}
rc = regulator_enable(hsusb_3p3);
if (rc) {
dev_err(motg->otg.dev, "unable to enable the hsusb 3p3\n");
goto put_3p3;
}
hsusb_1p8 = regulator_get(motg->otg.dev, "HSUSB_1p8");
if (IS_ERR(hsusb_1p8)) {
dev_err(motg->otg.dev, "unable to get hsusb 1p8\n");
rc = PTR_ERR(hsusb_1p8);
goto disable_3p3;
}
rc = regulator_set_voltage(hsusb_1p8, USB_PHY_1P8_VOL_MIN,
USB_PHY_1P8_VOL_MAX);
if (rc) {
dev_err(motg->otg.dev, "unable to set voltage level "
"for hsusb 1p8\n");
goto put_1p8;
}
rc = regulator_enable(hsusb_1p8);
if (rc) {
dev_err(motg->otg.dev, "unable to enable the hsusb 1p8\n");
goto put_1p8;
}
return 0;
}
regulator_disable(hsusb_1p8);
put_1p8:
regulator_put(hsusb_1p8);
disable_3p3:
regulator_disable(hsusb_3p3);
put_3p3:
regulator_put(hsusb_3p3);
return rc;
}
#ifdef CONFIG_PM_SLEEP
#define USB_PHY_SUSP_DIG_VOL 500000
static int msm_hsusb_config_vddcx(int high)
{
int max_vol = USB_PHY_VDD_DIG_VOL_MAX;
int min_vol;
int ret;
if (high)
min_vol = USB_PHY_VDD_DIG_VOL_MIN;
else
min_vol = USB_PHY_SUSP_DIG_VOL;
ret = regulator_set_voltage(hsusb_vddcx, min_vol, max_vol);
if (ret) {
pr_err("%s: unable to set the voltage for regulator "
"HSUSB_VDDCX\n", __func__);
return ret;
}
pr_debug("%s: min_vol:%d max_vol:%d\n", __func__, min_vol, max_vol);
return ret;
}
#endif
static int msm_hsusb_ldo_set_mode(int on)
{
int ret = 0;
if (!hsusb_1p8 || IS_ERR(hsusb_1p8)) {
pr_err("%s: HSUSB_1p8 is not initialized\n", __func__);
return -ENODEV;
}
if (!hsusb_3p3 || IS_ERR(hsusb_3p3)) {
pr_err("%s: HSUSB_3p3 is not initialized\n", __func__);
return -ENODEV;
}
if (on) {
ret = regulator_set_optimum_mode(hsusb_1p8,
USB_PHY_1P8_HPM_LOAD);
if (ret < 0) {
pr_err("%s: Unable to set HPM of the regulator "
"HSUSB_1p8\n", __func__);
return ret;
}
ret = regulator_set_optimum_mode(hsusb_3p3,
USB_PHY_3P3_HPM_LOAD);
if (ret < 0) {
pr_err("%s: Unable to set HPM of the regulator "
"HSUSB_3p3\n", __func__);
regulator_set_optimum_mode(hsusb_1p8,
USB_PHY_1P8_LPM_LOAD);
return ret;
}
} else {
ret = regulator_set_optimum_mode(hsusb_1p8,
USB_PHY_1P8_LPM_LOAD);
if (ret < 0)
pr_err("%s: Unable to set LPM of the regulator "
"HSUSB_1p8\n", __func__);
ret = regulator_set_optimum_mode(hsusb_3p3,
USB_PHY_3P3_LPM_LOAD);
if (ret < 0)
pr_err("%s: Unable to set LPM of the regulator "
"HSUSB_3p3\n", __func__);
}
pr_debug("reg (%s)\n", on ? "HPM" : "LPM");
return ret < 0 ? ret : 0;
}
static int ulpi_read(struct otg_transceiver *otg, u32 reg)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
int cnt = 0;
/* initiate read operation */
writel(ULPI_RUN | ULPI_READ | ULPI_ADDR(reg),
USB_ULPI_VIEWPORT);
/* wait for completion */
while (cnt < ULPI_IO_TIMEOUT_USEC) {
if (!(readl(USB_ULPI_VIEWPORT) & ULPI_RUN))
break;
udelay(1);
cnt++;
}
if (cnt >= ULPI_IO_TIMEOUT_USEC) {
dev_err(otg->dev, "ulpi_read: timeout %08x\n",
readl(USB_ULPI_VIEWPORT));
return -ETIMEDOUT;
}
return ULPI_DATA_READ(readl(USB_ULPI_VIEWPORT));
}
static int ulpi_write(struct otg_transceiver *otg, u32 val, u32 reg)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
int cnt = 0;
/* initiate write operation */
writel(ULPI_RUN | ULPI_WRITE |
ULPI_ADDR(reg) | ULPI_DATA(val),
USB_ULPI_VIEWPORT);
/* wait for completion */
while (cnt < ULPI_IO_TIMEOUT_USEC) {
if (!(readl(USB_ULPI_VIEWPORT) & ULPI_RUN))
break;
udelay(1);
cnt++;
}
if (cnt >= ULPI_IO_TIMEOUT_USEC) {
dev_err(otg->dev, "ulpi_write: timeout\n");
return -ETIMEDOUT;
}
return 0;
}
static struct otg_io_access_ops msm_otg_io_ops = {
.read = ulpi_read,
.write = ulpi_write,
};
static void ulpi_init(struct msm_otg *motg)
{
struct msm_otg_platform_data *pdata = motg->pdata;
int *seq = pdata->phy_init_seq;
if (!seq)
return;
while (seq[0] >= 0) {
dev_vdbg(motg->otg.dev, "ulpi: write 0x%02x to 0x%02x\n",
seq[0], seq[1]);
ulpi_write(&motg->otg, seq[0], seq[1]);
seq += 2;
}
}
static int msm_otg_link_clk_reset(struct msm_otg *motg, bool assert)
{
int ret;
if (assert) {
ret = clk_reset(motg->clk, CLK_RESET_ASSERT);
if (ret)
dev_err(motg->otg.dev, "usb hs_clk assert failed\n");
} else {
ret = clk_reset(motg->clk, CLK_RESET_DEASSERT);
if (ret)
dev_err(motg->otg.dev, "usb hs_clk deassert failed\n");
}
return ret;
}
static int msm_otg_phy_clk_reset(struct msm_otg *motg)
{
int ret;
ret = clk_reset(motg->phy_reset_clk, CLK_RESET_ASSERT);
if (ret) {
dev_err(motg->otg.dev, "usb phy clk assert failed\n");
return ret;
}
usleep_range(10000, 12000);
ret = clk_reset(motg->phy_reset_clk, CLK_RESET_DEASSERT);
if (ret)
dev_err(motg->otg.dev, "usb phy clk deassert failed\n");
return ret;
}
static int msm_otg_phy_reset(struct msm_otg *motg)
{
u32 val;
int ret;
int retries;
ret = msm_otg_link_clk_reset(motg, 1);
if (ret)
return ret;
ret = msm_otg_phy_clk_reset(motg);
if (ret)
return ret;
ret = msm_otg_link_clk_reset(motg, 0);
if (ret)
return ret;
val = readl(USB_PORTSC) & ~PORTSC_PTS_MASK;
writel(val | PORTSC_PTS_ULPI, USB_PORTSC);
for (retries = 3; retries > 0; retries--) {
ret = ulpi_write(&motg->otg, ULPI_FUNC_CTRL_SUSPENDM,
ULPI_CLR(ULPI_FUNC_CTRL));
if (!ret)
break;
ret = msm_otg_phy_clk_reset(motg);
if (ret)
return ret;
}
if (!retries)
return -ETIMEDOUT;
/* This reset calibrates the phy, if the above write succeeded */
ret = msm_otg_phy_clk_reset(motg);
if (ret)
return ret;
for (retries = 3; retries > 0; retries--) {
ret = ulpi_read(&motg->otg, ULPI_DEBUG);
if (ret != -ETIMEDOUT)
break;
ret = msm_otg_phy_clk_reset(motg);
if (ret)
return ret;
}
if (!retries)
return -ETIMEDOUT;
dev_info(motg->otg.dev, "phy_reset: success\n");
return 0;
}
#define LINK_RESET_TIMEOUT_USEC (250 * 1000)
static int msm_otg_reset(struct otg_transceiver *otg)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
struct msm_otg_platform_data *pdata = motg->pdata;
int cnt = 0;
int ret;
u32 val = 0;
u32 ulpi_val = 0;
ret = msm_otg_phy_reset(motg);
if (ret) {
dev_err(otg->dev, "phy_reset failed\n");
return ret;
}
ulpi_init(motg);
writel(USBCMD_RESET, USB_USBCMD);
while (cnt < LINK_RESET_TIMEOUT_USEC) {
if (!(readl(USB_USBCMD) & USBCMD_RESET))
break;
udelay(1);
cnt++;
}
if (cnt >= LINK_RESET_TIMEOUT_USEC)
return -ETIMEDOUT;
/* select ULPI phy */
writel(0x80000000, USB_PORTSC);
msleep(100);
writel(0x0, USB_AHBBURST);
writel(0x00, USB_AHBMODE);
if (pdata->otg_control == OTG_PHY_CONTROL) {
val = readl(USB_OTGSC);
if (pdata->mode == USB_OTG) {
ulpi_val = ULPI_INT_IDGRD | ULPI_INT_SESS_VALID;
val |= OTGSC_IDIE | OTGSC_BSVIE;
} else if (pdata->mode == USB_PERIPHERAL) {
ulpi_val = ULPI_INT_SESS_VALID;
val |= OTGSC_BSVIE;
}
writel(val, USB_OTGSC);
ulpi_write(otg, ulpi_val, ULPI_USB_INT_EN_RISE);
ulpi_write(otg, ulpi_val, ULPI_USB_INT_EN_FALL);
}
return 0;
}
#define PHY_SUSPEND_TIMEOUT_USEC (500 * 1000)
#define PHY_RESUME_TIMEOUT_USEC (100 * 1000)
#ifdef CONFIG_PM_SLEEP
static int msm_otg_suspend(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
struct usb_bus *bus = otg->host;
struct msm_otg_platform_data *pdata = motg->pdata;
int cnt = 0;
if (atomic_read(&motg->in_lpm))
return 0;
disable_irq(motg->irq);
/*
* Chipidea 45-nm PHY suspend sequence:
*
* Interrupt Latch Register auto-clear feature is not present
* in all PHY versions. Latch register is clear on read type.
* Clear latch register to avoid spurious wakeup from
* low power mode (LPM).
*
* PHY comparators are disabled when PHY enters into low power
* mode (LPM). Keep PHY comparators ON in LPM only when we expect
* VBUS/Id notifications from USB PHY. Otherwise turn off USB
* PHY comparators. This save significant amount of power.
*
* PLL is not turned off when PHY enters into low power mode (LPM).
* Disable PLL for maximum power savings.
*/
if (motg->pdata->phy_type == CI_45NM_INTEGRATED_PHY) {
ulpi_read(otg, 0x14);
if (pdata->otg_control == OTG_PHY_CONTROL)
ulpi_write(otg, 0x01, 0x30);
ulpi_write(otg, 0x08, 0x09);
}
/*
* PHY may take some time or even fail to enter into low power
* mode (LPM). Hence poll for 500 msec and reset the PHY and link
* in failure case.
*/
writel(readl(USB_PORTSC) | PORTSC_PHCD, USB_PORTSC);
while (cnt < PHY_SUSPEND_TIMEOUT_USEC) {
if (readl(USB_PORTSC) & PORTSC_PHCD)
break;
udelay(1);
cnt++;
}
if (cnt >= PHY_SUSPEND_TIMEOUT_USEC) {
dev_err(otg->dev, "Unable to suspend PHY\n");
msm_otg_reset(otg);
enable_irq(motg->irq);
return -ETIMEDOUT;
}
/*
* PHY has capability to generate interrupt asynchronously in low
* power mode (LPM). This interrupt is level triggered. So USB IRQ
* line must be disabled till async interrupt enable bit is cleared
* in USBCMD register. Assert STP (ULPI interface STOP signal) to
* block data communication from PHY.
*/
writel(readl(USB_USBCMD) | ASYNC_INTR_CTRL | ULPI_STP_CTRL, USB_USBCMD);
if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
motg->pdata->otg_control == OTG_PMIC_CONTROL)
writel(readl(USB_PHY_CTRL) | PHY_RETEN, USB_PHY_CTRL);
clk_disable(motg->pclk);
clk_disable(motg->clk);
if (motg->core_clk)
clk_disable(motg->core_clk);
if (!IS_ERR(motg->pclk_src))
clk_disable(motg->pclk_src);
if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
motg->pdata->otg_control == OTG_PMIC_CONTROL) {
msm_hsusb_ldo_set_mode(0);
msm_hsusb_config_vddcx(0);
}
if (device_may_wakeup(otg->dev))
enable_irq_wake(motg->irq);
if (bus)
clear_bit(HCD_FLAG_HW_ACCESSIBLE, &(bus_to_hcd(bus))->flags);
atomic_set(&motg->in_lpm, 1);
enable_irq(motg->irq);
dev_info(otg->dev, "USB in low power mode\n");
return 0;
}
static int msm_otg_resume(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
struct usb_bus *bus = otg->host;
int cnt = 0;
unsigned temp;
if (!atomic_read(&motg->in_lpm))
return 0;
if (!IS_ERR(motg->pclk_src))
clk_enable(motg->pclk_src);
clk_enable(motg->pclk);
clk_enable(motg->clk);
if (motg->core_clk)
clk_enable(motg->core_clk);
if (motg->pdata->phy_type == SNPS_28NM_INTEGRATED_PHY &&
motg->pdata->otg_control == OTG_PMIC_CONTROL) {
msm_hsusb_ldo_set_mode(1);
msm_hsusb_config_vddcx(1);
writel(readl(USB_PHY_CTRL) & ~PHY_RETEN, USB_PHY_CTRL);
}
temp = readl(USB_USBCMD);
temp &= ~ASYNC_INTR_CTRL;
temp &= ~ULPI_STP_CTRL;
writel(temp, USB_USBCMD);
/*
* PHY comes out of low power mode (LPM) in case of wakeup
* from asynchronous interrupt.
*/
if (!(readl(USB_PORTSC) & PORTSC_PHCD))
goto skip_phy_resume;
writel(readl(USB_PORTSC) & ~PORTSC_PHCD, USB_PORTSC);
while (cnt < PHY_RESUME_TIMEOUT_USEC) {
if (!(readl(USB_PORTSC) & PORTSC_PHCD))
break;
udelay(1);
cnt++;
}
if (cnt >= PHY_RESUME_TIMEOUT_USEC) {
/*
* This is a fatal error. Reset the link and
* PHY. USB state can not be restored. Re-insertion
* of USB cable is the only way to get USB working.
*/
dev_err(otg->dev, "Unable to resume USB."
"Re-plugin the cable\n");
msm_otg_reset(otg);
}
skip_phy_resume:
if (device_may_wakeup(otg->dev))
disable_irq_wake(motg->irq);
if (bus)
set_bit(HCD_FLAG_HW_ACCESSIBLE, &(bus_to_hcd(bus))->flags);
atomic_set(&motg->in_lpm, 0);
if (motg->async_int) {
motg->async_int = 0;
pm_runtime_put(otg->dev);
enable_irq(motg->irq);
}
dev_info(otg->dev, "USB exited from low power mode\n");
return 0;
}
#endif
static void msm_otg_notify_charger(struct msm_otg *motg, unsigned mA)
{
if (motg->cur_power == mA)
return;
/* TODO: Notify PMIC about available current */
dev_info(motg->otg.dev, "Avail curr from USB = %u\n", mA);
motg->cur_power = mA;
}
static int msm_otg_set_power(struct otg_transceiver *otg, unsigned mA)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
/*
* Gadget driver uses set_power method to notify about the
* available current based on suspend/configured states.
*
* IDEV_CHG can be drawn irrespective of suspend/un-configured
* states when CDP/ACA is connected.
*/
if (motg->chg_type == USB_SDP_CHARGER)
msm_otg_notify_charger(motg, mA);
return 0;
}
static void msm_otg_start_host(struct otg_transceiver *otg, int on)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
struct msm_otg_platform_data *pdata = motg->pdata;
struct usb_hcd *hcd;
if (!otg->host)
return;
hcd = bus_to_hcd(otg->host);
if (on) {
dev_dbg(otg->dev, "host on\n");
if (pdata->vbus_power)
pdata->vbus_power(1);
/*
* Some boards have a switch cotrolled by gpio
* to enable/disable internal HUB. Enable internal
* HUB before kicking the host.
*/
if (pdata->setup_gpio)
pdata->setup_gpio(OTG_STATE_A_HOST);
#ifdef CONFIG_USB
usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
#endif
} else {
dev_dbg(otg->dev, "host off\n");
#ifdef CONFIG_USB
usb_remove_hcd(hcd);
#endif
if (pdata->setup_gpio)
pdata->setup_gpio(OTG_STATE_UNDEFINED);
if (pdata->vbus_power)
pdata->vbus_power(0);
}
}
static int msm_otg_set_host(struct otg_transceiver *otg, struct usb_bus *host)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
struct usb_hcd *hcd;
/*
* Fail host registration if this board can support
* only peripheral configuration.
*/
if (motg->pdata->mode == USB_PERIPHERAL) {
dev_info(otg->dev, "Host mode is not supported\n");
return -ENODEV;
}
if (!host) {
if (otg->state == OTG_STATE_A_HOST) {
pm_runtime_get_sync(otg->dev);
msm_otg_start_host(otg, 0);
otg->host = NULL;
otg->state = OTG_STATE_UNDEFINED;
schedule_work(&motg->sm_work);
} else {
otg->host = NULL;
}
return 0;
}
hcd = bus_to_hcd(host);
hcd->power_budget = motg->pdata->power_budget;
otg->host = host;
dev_dbg(otg->dev, "host driver registered w/ tranceiver\n");
/*
* Kick the state machine work, if peripheral is not supported
* or peripheral is already registered with us.
*/
if (motg->pdata->mode == USB_HOST || otg->gadget) {
pm_runtime_get_sync(otg->dev);
schedule_work(&motg->sm_work);
}
return 0;
}
static void msm_otg_start_peripheral(struct otg_transceiver *otg, int on)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
struct msm_otg_platform_data *pdata = motg->pdata;
if (!otg->gadget)
return;
if (on) {
dev_dbg(otg->dev, "gadget on\n");
/*
* Some boards have a switch cotrolled by gpio
* to enable/disable internal HUB. Disable internal
* HUB before kicking the gadget.
*/
if (pdata->setup_gpio)
pdata->setup_gpio(OTG_STATE_B_PERIPHERAL);
usb_gadget_vbus_connect(otg->gadget);
} else {
dev_dbg(otg->dev, "gadget off\n");
usb_gadget_vbus_disconnect(otg->gadget);
if (pdata->setup_gpio)
pdata->setup_gpio(OTG_STATE_UNDEFINED);
}
}
static int msm_otg_set_peripheral(struct otg_transceiver *otg,
struct usb_gadget *gadget)
{
struct msm_otg *motg = container_of(otg, struct msm_otg, otg);
/*
* Fail peripheral registration if this board can support
* only host configuration.
*/
if (motg->pdata->mode == USB_HOST) {
dev_info(otg->dev, "Peripheral mode is not supported\n");
return -ENODEV;
}
if (!gadget) {
if (otg->state == OTG_STATE_B_PERIPHERAL) {
pm_runtime_get_sync(otg->dev);
msm_otg_start_peripheral(otg, 0);
otg->gadget = NULL;
otg->state = OTG_STATE_UNDEFINED;
schedule_work(&motg->sm_work);
} else {
otg->gadget = NULL;
}
return 0;
}
otg->gadget = gadget;
dev_dbg(otg->dev, "peripheral driver registered w/ tranceiver\n");
/*
* Kick the state machine work, if host is not supported
* or host is already registered with us.
*/
if (motg->pdata->mode == USB_PERIPHERAL || otg->host) {
pm_runtime_get_sync(otg->dev);
schedule_work(&motg->sm_work);
}
return 0;
}
static bool msm_chg_check_secondary_det(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 chg_det;
bool ret = false;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
ret = chg_det & (1 << 4);
break;
case SNPS_28NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x87);
ret = chg_det & 1;
break;
default:
break;
}
return ret;
}
static void msm_chg_enable_secondary_det(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 chg_det;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
/* Turn off charger block */
chg_det |= ~(1 << 1);
ulpi_write(otg, chg_det, 0x34);
udelay(20);
/* control chg block via ULPI */
chg_det &= ~(1 << 3);
ulpi_write(otg, chg_det, 0x34);
/* put it in host mode for enabling D- source */
chg_det &= ~(1 << 2);
ulpi_write(otg, chg_det, 0x34);
/* Turn on chg detect block */
chg_det &= ~(1 << 1);
ulpi_write(otg, chg_det, 0x34);
udelay(20);
/* enable chg detection */
chg_det &= ~(1 << 0);
ulpi_write(otg, chg_det, 0x34);
break;
case SNPS_28NM_INTEGRATED_PHY:
/*
* Configure DM as current source, DP as current sink
* and enable battery charging comparators.
*/
ulpi_write(otg, 0x8, 0x85);
ulpi_write(otg, 0x2, 0x85);
ulpi_write(otg, 0x1, 0x85);
break;
default:
break;
}
}
static bool msm_chg_check_primary_det(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 chg_det;
bool ret = false;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
ret = chg_det & (1 << 4);
break;
case SNPS_28NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x87);
ret = chg_det & 1;
break;
default:
break;
}
return ret;
}
static void msm_chg_enable_primary_det(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 chg_det;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
/* enable chg detection */
chg_det &= ~(1 << 0);
ulpi_write(otg, chg_det, 0x34);
break;
case SNPS_28NM_INTEGRATED_PHY:
/*
* Configure DP as current source, DM as current sink
* and enable battery charging comparators.
*/
ulpi_write(otg, 0x2, 0x85);
ulpi_write(otg, 0x1, 0x85);
break;
default:
break;
}
}
static bool msm_chg_check_dcd(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 line_state;
bool ret = false;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
line_state = ulpi_read(otg, 0x15);
ret = !(line_state & 1);
break;
case SNPS_28NM_INTEGRATED_PHY:
line_state = ulpi_read(otg, 0x87);
ret = line_state & 2;
break;
default:
break;
}
return ret;
}
static void msm_chg_disable_dcd(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 chg_det;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
chg_det &= ~(1 << 5);
ulpi_write(otg, chg_det, 0x34);
break;
case SNPS_28NM_INTEGRATED_PHY:
ulpi_write(otg, 0x10, 0x86);
break;
default:
break;
}
}
static void msm_chg_enable_dcd(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 chg_det;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
/* Turn on D+ current source */
chg_det |= (1 << 5);
ulpi_write(otg, chg_det, 0x34);
break;
case SNPS_28NM_INTEGRATED_PHY:
/* Data contact detection enable */
ulpi_write(otg, 0x10, 0x85);
break;
default:
break;
}
}
static void msm_chg_block_on(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 func_ctrl, chg_det;
/* put the controller in non-driving mode */
func_ctrl = ulpi_read(otg, ULPI_FUNC_CTRL);
func_ctrl &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
func_ctrl |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
ulpi_write(otg, func_ctrl, ULPI_FUNC_CTRL);
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
/* control chg block via ULPI */
chg_det &= ~(1 << 3);
ulpi_write(otg, chg_det, 0x34);
/* Turn on chg detect block */
chg_det &= ~(1 << 1);
ulpi_write(otg, chg_det, 0x34);
udelay(20);
break;
case SNPS_28NM_INTEGRATED_PHY:
/* Clear charger detecting control bits */
ulpi_write(otg, 0x3F, 0x86);
/* Clear alt interrupt latch and enable bits */
ulpi_write(otg, 0x1F, 0x92);
ulpi_write(otg, 0x1F, 0x95);
udelay(100);
break;
default:
break;
}
}
static void msm_chg_block_off(struct msm_otg *motg)
{
struct otg_transceiver *otg = &motg->otg;
u32 func_ctrl, chg_det;
switch (motg->pdata->phy_type) {
case CI_45NM_INTEGRATED_PHY:
chg_det = ulpi_read(otg, 0x34);
/* Turn off charger block */
chg_det |= ~(1 << 1);
ulpi_write(otg, chg_det, 0x34);
break;
case SNPS_28NM_INTEGRATED_PHY:
/* Clear charger detecting control bits */
ulpi_write(otg, 0x3F, 0x86);
/* Clear alt interrupt latch and enable bits */
ulpi_write(otg, 0x1F, 0x92);
ulpi_write(otg, 0x1F, 0x95);
break;
default:
break;
}
/* put the controller in normal mode */
func_ctrl = ulpi_read(otg, ULPI_FUNC_CTRL);
func_ctrl &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
func_ctrl |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
ulpi_write(otg, func_ctrl, ULPI_FUNC_CTRL);
}
#define MSM_CHG_DCD_POLL_TIME (100 * HZ/1000) /* 100 msec */
#define MSM_CHG_DCD_MAX_RETRIES 6 /* Tdcd_tmout = 6 * 100 msec */
#define MSM_CHG_PRIMARY_DET_TIME (40 * HZ/1000) /* TVDPSRC_ON */
#define MSM_CHG_SECONDARY_DET_TIME (40 * HZ/1000) /* TVDMSRC_ON */
static void msm_chg_detect_work(struct work_struct *w)
{
struct msm_otg *motg = container_of(w, struct msm_otg, chg_work.work);
struct otg_transceiver *otg = &motg->otg;
bool is_dcd, tmout, vout;
unsigned long delay;
dev_dbg(otg->dev, "chg detection work\n");
switch (motg->chg_state) {
case USB_CHG_STATE_UNDEFINED:
pm_runtime_get_sync(otg->dev);
msm_chg_block_on(motg);
msm_chg_enable_dcd(motg);
motg->chg_state = USB_CHG_STATE_WAIT_FOR_DCD;
motg->dcd_retries = 0;
delay = MSM_CHG_DCD_POLL_TIME;
break;
case USB_CHG_STATE_WAIT_FOR_DCD:
is_dcd = msm_chg_check_dcd(motg);
tmout = ++motg->dcd_retries == MSM_CHG_DCD_MAX_RETRIES;
if (is_dcd || tmout) {
msm_chg_disable_dcd(motg);
msm_chg_enable_primary_det(motg);
delay = MSM_CHG_PRIMARY_DET_TIME;
motg->chg_state = USB_CHG_STATE_DCD_DONE;
} else {
delay = MSM_CHG_DCD_POLL_TIME;
}
break;
case USB_CHG_STATE_DCD_DONE:
vout = msm_chg_check_primary_det(motg);
if (vout) {
msm_chg_enable_secondary_det(motg);
delay = MSM_CHG_SECONDARY_DET_TIME;
motg->chg_state = USB_CHG_STATE_PRIMARY_DONE;
} else {
motg->chg_type = USB_SDP_CHARGER;
motg->chg_state = USB_CHG_STATE_DETECTED;
delay = 0;
}
break;
case USB_CHG_STATE_PRIMARY_DONE:
vout = msm_chg_check_secondary_det(motg);
if (vout)
motg->chg_type = USB_DCP_CHARGER;
else
motg->chg_type = USB_CDP_CHARGER;
motg->chg_state = USB_CHG_STATE_SECONDARY_DONE;
/* fall through */
case USB_CHG_STATE_SECONDARY_DONE:
motg->chg_state = USB_CHG_STATE_DETECTED;
case USB_CHG_STATE_DETECTED:
msm_chg_block_off(motg);
dev_dbg(otg->dev, "charger = %d\n", motg->chg_type);
schedule_work(&motg->sm_work);
return;
default:
return;
}
schedule_delayed_work(&motg->chg_work, delay);
}
/*
* We support OTG, Peripheral only and Host only configurations. In case
* of OTG, mode switch (host-->peripheral/peripheral-->host) can happen
* via Id pin status or user request (debugfs). Id/BSV interrupts are not
* enabled when switch is controlled by user and default mode is supplied
* by board file, which can be changed by userspace later.
*/
static void msm_otg_init_sm(struct msm_otg *motg)
{
struct msm_otg_platform_data *pdata = motg->pdata;
u32 otgsc = readl(USB_OTGSC);
switch (pdata->mode) {
case USB_OTG:
if (pdata->otg_control == OTG_PHY_CONTROL) {
if (otgsc & OTGSC_ID)
set_bit(ID, &motg->inputs);
else
clear_bit(ID, &motg->inputs);
if (otgsc & OTGSC_BSV)
set_bit(B_SESS_VLD, &motg->inputs);
else
clear_bit(B_SESS_VLD, &motg->inputs);
} else if (pdata->otg_control == OTG_USER_CONTROL) {
if (pdata->default_mode == USB_HOST) {
clear_bit(ID, &motg->inputs);
} else if (pdata->default_mode == USB_PERIPHERAL) {
set_bit(ID, &motg->inputs);
set_bit(B_SESS_VLD, &motg->inputs);
} else {
set_bit(ID, &motg->inputs);
clear_bit(B_SESS_VLD, &motg->inputs);
}
}
break;
case USB_HOST:
clear_bit(ID, &motg->inputs);
break;
case USB_PERIPHERAL:
set_bit(ID, &motg->inputs);
if (otgsc & OTGSC_BSV)
set_bit(B_SESS_VLD, &motg->inputs);
else
clear_bit(B_SESS_VLD, &motg->inputs);
break;
default:
break;
}
}
static void msm_otg_sm_work(struct work_struct *w)
{
struct msm_otg *motg = container_of(w, struct msm_otg, sm_work);
struct otg_transceiver *otg = &motg->otg;
switch (otg->state) {
case OTG_STATE_UNDEFINED:
dev_dbg(otg->dev, "OTG_STATE_UNDEFINED state\n");
msm_otg_reset(otg);
msm_otg_init_sm(motg);
otg->state = OTG_STATE_B_IDLE;
/* FALL THROUGH */
case OTG_STATE_B_IDLE:
dev_dbg(otg->dev, "OTG_STATE_B_IDLE state\n");
if (!test_bit(ID, &motg->inputs) && otg->host) {
/* disable BSV bit */
writel(readl(USB_OTGSC) & ~OTGSC_BSVIE, USB_OTGSC);
msm_otg_start_host(otg, 1);
otg->state = OTG_STATE_A_HOST;
} else if (test_bit(B_SESS_VLD, &motg->inputs)) {
switch (motg->chg_state) {
case USB_CHG_STATE_UNDEFINED:
msm_chg_detect_work(&motg->chg_work.work);
break;
case USB_CHG_STATE_DETECTED:
switch (motg->chg_type) {
case USB_DCP_CHARGER:
msm_otg_notify_charger(motg,
IDEV_CHG_MAX);
break;
case USB_CDP_CHARGER:
msm_otg_notify_charger(motg,
IDEV_CHG_MAX);
msm_otg_start_peripheral(otg, 1);
otg->state = OTG_STATE_B_PERIPHERAL;
break;
case USB_SDP_CHARGER:
msm_otg_notify_charger(motg, IUNIT);
msm_otg_start_peripheral(otg, 1);
otg->state = OTG_STATE_B_PERIPHERAL;
break;
default:
break;
}
break;
default:
break;
}
} else {
/*
* If charger detection work is pending, decrement
* the pm usage counter to balance with the one that
* is incremented in charger detection work.
*/
if (cancel_delayed_work_sync(&motg->chg_work)) {
pm_runtime_put_sync(otg->dev);
msm_otg_reset(otg);
}
msm_otg_notify_charger(motg, 0);
motg->chg_state = USB_CHG_STATE_UNDEFINED;
motg->chg_type = USB_INVALID_CHARGER;
}
pm_runtime_put_sync(otg->dev);
break;
case OTG_STATE_B_PERIPHERAL:
dev_dbg(otg->dev, "OTG_STATE_B_PERIPHERAL state\n");
if (!test_bit(B_SESS_VLD, &motg->inputs) ||
!test_bit(ID, &motg->inputs)) {
msm_otg_notify_charger(motg, 0);
msm_otg_start_peripheral(otg, 0);
motg->chg_state = USB_CHG_STATE_UNDEFINED;
motg->chg_type = USB_INVALID_CHARGER;
otg->state = OTG_STATE_B_IDLE;
msm_otg_reset(otg);
schedule_work(w);
}
break;
case OTG_STATE_A_HOST:
dev_dbg(otg->dev, "OTG_STATE_A_HOST state\n");
if (test_bit(ID, &motg->inputs)) {
msm_otg_start_host(otg, 0);
otg->state = OTG_STATE_B_IDLE;
msm_otg_reset(otg);
schedule_work(w);
}
break;
default:
break;
}
}
static irqreturn_t msm_otg_irq(int irq, void *data)
{
struct msm_otg *motg = data;
struct otg_transceiver *otg = &motg->otg;
u32 otgsc = 0;
if (atomic_read(&motg->in_lpm)) {
disable_irq_nosync(irq);
motg->async_int = 1;
pm_runtime_get(otg->dev);
return IRQ_HANDLED;
}
otgsc = readl(USB_OTGSC);
if (!(otgsc & (OTGSC_IDIS | OTGSC_BSVIS)))
return IRQ_NONE;
if ((otgsc & OTGSC_IDIS) && (otgsc & OTGSC_IDIE)) {
if (otgsc & OTGSC_ID)
set_bit(ID, &motg->inputs);
else
clear_bit(ID, &motg->inputs);
dev_dbg(otg->dev, "ID set/clear\n");
pm_runtime_get_noresume(otg->dev);
} else if ((otgsc & OTGSC_BSVIS) && (otgsc & OTGSC_BSVIE)) {
if (otgsc & OTGSC_BSV)
set_bit(B_SESS_VLD, &motg->inputs);
else
clear_bit(B_SESS_VLD, &motg->inputs);
dev_dbg(otg->dev, "BSV set/clear\n");
pm_runtime_get_noresume(otg->dev);
}
writel(otgsc, USB_OTGSC);
schedule_work(&motg->sm_work);
return IRQ_HANDLED;
}
static int msm_otg_mode_show(struct seq_file *s, void *unused)
{
struct msm_otg *motg = s->private;
struct otg_transceiver *otg = &motg->otg;
switch (otg->state) {
case OTG_STATE_A_HOST:
seq_printf(s, "host\n");
break;
case OTG_STATE_B_PERIPHERAL:
seq_printf(s, "peripheral\n");
break;
default:
seq_printf(s, "none\n");
break;
}
return 0;
}
static int msm_otg_mode_open(struct inode *inode, struct file *file)
{
return single_open(file, msm_otg_mode_show, inode->i_private);
}
static ssize_t msm_otg_mode_write(struct file *file, const char __user *ubuf,
size_t count, loff_t *ppos)
{
struct seq_file *s = file->private_data;
struct msm_otg *motg = s->private;
char buf[16];
struct otg_transceiver *otg = &motg->otg;
int status = count;
enum usb_mode_type req_mode;
memset(buf, 0x00, sizeof(buf));
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) {
status = -EFAULT;
goto out;
}
if (!strncmp(buf, "host", 4)) {
req_mode = USB_HOST;
} else if (!strncmp(buf, "peripheral", 10)) {
req_mode = USB_PERIPHERAL;
} else if (!strncmp(buf, "none", 4)) {
req_mode = USB_NONE;
} else {
status = -EINVAL;
goto out;
}
switch (req_mode) {
case USB_NONE:
switch (otg->state) {
case OTG_STATE_A_HOST:
case OTG_STATE_B_PERIPHERAL:
set_bit(ID, &motg->inputs);
clear_bit(B_SESS_VLD, &motg->inputs);
break;
default:
goto out;
}
break;
case USB_PERIPHERAL:
switch (otg->state) {
case OTG_STATE_B_IDLE:
case OTG_STATE_A_HOST:
set_bit(ID, &motg->inputs);
set_bit(B_SESS_VLD, &motg->inputs);
break;
default:
goto out;
}
break;
case USB_HOST:
switch (otg->state) {
case OTG_STATE_B_IDLE:
case OTG_STATE_B_PERIPHERAL:
clear_bit(ID, &motg->inputs);
break;
default:
goto out;
}
break;
default:
goto out;
}
pm_runtime_get_sync(otg->dev);
schedule_work(&motg->sm_work);
out:
return status;
}
const struct file_operations msm_otg_mode_fops = {
.open = msm_otg_mode_open,
.read = seq_read,
.write = msm_otg_mode_write,
.llseek = seq_lseek,
.release = single_release,
};
static struct dentry *msm_otg_dbg_root;
static struct dentry *msm_otg_dbg_mode;
static int msm_otg_debugfs_init(struct msm_otg *motg)
{
msm_otg_dbg_root = debugfs_create_dir("msm_otg", NULL);
if (!msm_otg_dbg_root || IS_ERR(msm_otg_dbg_root))
return -ENODEV;
msm_otg_dbg_mode = debugfs_create_file("mode", S_IRUGO | S_IWUSR,
msm_otg_dbg_root, motg, &msm_otg_mode_fops);
if (!msm_otg_dbg_mode) {
debugfs_remove(msm_otg_dbg_root);
msm_otg_dbg_root = NULL;
return -ENODEV;
}
return 0;
}
static void msm_otg_debugfs_cleanup(void)
{
debugfs_remove(msm_otg_dbg_mode);
debugfs_remove(msm_otg_dbg_root);
}
static int __init msm_otg_probe(struct platform_device *pdev)
{
int ret = 0;
struct resource *res;
struct msm_otg *motg;
struct otg_transceiver *otg;
dev_info(&pdev->dev, "msm_otg probe\n");
if (!pdev->dev.platform_data) {
dev_err(&pdev->dev, "No platform data given. Bailing out\n");
return -ENODEV;
}
motg = kzalloc(sizeof(struct msm_otg), GFP_KERNEL);
if (!motg) {
dev_err(&pdev->dev, "unable to allocate msm_otg\n");
return -ENOMEM;
}
motg->pdata = pdev->dev.platform_data;
otg = &motg->otg;
otg->dev = &pdev->dev;
motg->phy_reset_clk = clk_get(&pdev->dev, "usb_phy_clk");
if (IS_ERR(motg->phy_reset_clk)) {
dev_err(&pdev->dev, "failed to get usb_phy_clk\n");
ret = PTR_ERR(motg->phy_reset_clk);
goto free_motg;
}
motg->clk = clk_get(&pdev->dev, "usb_hs_clk");
if (IS_ERR(motg->clk)) {
dev_err(&pdev->dev, "failed to get usb_hs_clk\n");
ret = PTR_ERR(motg->clk);
goto put_phy_reset_clk;
}
clk_set_rate(motg->clk, 60000000);
/*
* If USB Core is running its protocol engine based on CORE CLK,
* CORE CLK must be running at >55Mhz for correct HSUSB
* operation and USB core cannot tolerate frequency changes on
* CORE CLK. For such USB cores, vote for maximum clk frequency
* on pclk source
*/
if (motg->pdata->pclk_src_name) {
motg->pclk_src = clk_get(&pdev->dev,
motg->pdata->pclk_src_name);
if (IS_ERR(motg->pclk_src))
goto put_clk;
clk_set_rate(motg->pclk_src, INT_MAX);
clk_enable(motg->pclk_src);
} else
motg->pclk_src = ERR_PTR(-ENOENT);
motg->pclk = clk_get(&pdev->dev, "usb_hs_pclk");
if (IS_ERR(motg->pclk)) {
dev_err(&pdev->dev, "failed to get usb_hs_pclk\n");
ret = PTR_ERR(motg->pclk);
goto put_pclk_src;
}
/*
* USB core clock is not present on all MSM chips. This
* clock is introduced to remove the dependency on AXI
* bus frequency.
*/
motg->core_clk = clk_get(&pdev->dev, "usb_hs_core_clk");
if (IS_ERR(motg->core_clk))
motg->core_clk = NULL;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "failed to get platform resource mem\n");
ret = -ENODEV;
goto put_core_clk;
}
motg->regs = ioremap(res->start, resource_size(res));
if (!motg->regs) {
dev_err(&pdev->dev, "ioremap failed\n");
ret = -ENOMEM;
goto put_core_clk;
}
dev_info(&pdev->dev, "OTG regs = %p\n", motg->regs);
motg->irq = platform_get_irq(pdev, 0);
if (!motg->irq) {
dev_err(&pdev->dev, "platform_get_irq failed\n");
ret = -ENODEV;
goto free_regs;
}
clk_enable(motg->clk);
clk_enable(motg->pclk);
ret = msm_hsusb_init_vddcx(motg, 1);
if (ret) {
dev_err(&pdev->dev, "hsusb vddcx configuration failed\n");
goto free_regs;
}
ret = msm_hsusb_ldo_init(motg, 1);
if (ret) {
dev_err(&pdev->dev, "hsusb vreg configuration failed\n");
goto vddcx_exit;
}
ret = msm_hsusb_ldo_set_mode(1);
if (ret) {
dev_err(&pdev->dev, "hsusb vreg enable failed\n");
goto ldo_exit;
}
if (motg->core_clk)
clk_enable(motg->core_clk);
writel(0, USB_USBINTR);
writel(0, USB_OTGSC);
INIT_WORK(&motg->sm_work, msm_otg_sm_work);
INIT_DELAYED_WORK(&motg->chg_work, msm_chg_detect_work);
ret = request_irq(motg->irq, msm_otg_irq, IRQF_SHARED,
"msm_otg", motg);
if (ret) {
dev_err(&pdev->dev, "request irq failed\n");
goto disable_clks;
}
otg->init = msm_otg_reset;
otg->set_host = msm_otg_set_host;
otg->set_peripheral = msm_otg_set_peripheral;
otg->set_power = msm_otg_set_power;
otg->io_ops = &msm_otg_io_ops;
ret = otg_set_transceiver(&motg->otg);
if (ret) {
dev_err(&pdev->dev, "otg_set_transceiver failed\n");
goto free_irq;
}
platform_set_drvdata(pdev, motg);
device_init_wakeup(&pdev->dev, 1);
if (motg->pdata->mode == USB_OTG &&
motg->pdata->otg_control == OTG_USER_CONTROL) {
ret = msm_otg_debugfs_init(motg);
if (ret)
dev_dbg(&pdev->dev, "mode debugfs file is"
"not available\n");
}
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
free_irq:
free_irq(motg->irq, motg);
disable_clks:
clk_disable(motg->pclk);
clk_disable(motg->clk);
ldo_exit:
msm_hsusb_ldo_init(motg, 0);
vddcx_exit:
msm_hsusb_init_vddcx(motg, 0);
free_regs:
iounmap(motg->regs);
put_core_clk:
if (motg->core_clk)
clk_put(motg->core_clk);
clk_put(motg->pclk);
put_pclk_src:
if (!IS_ERR(motg->pclk_src)) {
clk_disable(motg->pclk_src);
clk_put(motg->pclk_src);
}
put_clk:
clk_put(motg->clk);
put_phy_reset_clk:
clk_put(motg->phy_reset_clk);
free_motg:
kfree(motg);
return ret;
}
static int __devexit msm_otg_remove(struct platform_device *pdev)
{
struct msm_otg *motg = platform_get_drvdata(pdev);
struct otg_transceiver *otg = &motg->otg;
int cnt = 0;
if (otg->host || otg->gadget)
return -EBUSY;
msm_otg_debugfs_cleanup();
cancel_delayed_work_sync(&motg->chg_work);
cancel_work_sync(&motg->sm_work);
pm_runtime_resume(&pdev->dev);
device_init_wakeup(&pdev->dev, 0);
pm_runtime_disable(&pdev->dev);
otg_set_transceiver(NULL);
free_irq(motg->irq, motg);
/*
* Put PHY in low power mode.
*/
ulpi_read(otg, 0x14);
ulpi_write(otg, 0x08, 0x09);
writel(readl(USB_PORTSC) | PORTSC_PHCD, USB_PORTSC);
while (cnt < PHY_SUSPEND_TIMEOUT_USEC) {
if (readl(USB_PORTSC) & PORTSC_PHCD)
break;
udelay(1);
cnt++;
}
if (cnt >= PHY_SUSPEND_TIMEOUT_USEC)
dev_err(otg->dev, "Unable to suspend PHY\n");
clk_disable(motg->pclk);
clk_disable(motg->clk);
if (motg->core_clk)
clk_disable(motg->core_clk);
if (!IS_ERR(motg->pclk_src)) {
clk_disable(motg->pclk_src);
clk_put(motg->pclk_src);
}
msm_hsusb_ldo_init(motg, 0);
iounmap(motg->regs);
pm_runtime_set_suspended(&pdev->dev);
clk_put(motg->phy_reset_clk);
clk_put(motg->pclk);
clk_put(motg->clk);
if (motg->core_clk)
clk_put(motg->core_clk);
kfree(motg);
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int msm_otg_runtime_idle(struct device *dev)
{
struct msm_otg *motg = dev_get_drvdata(dev);
struct otg_transceiver *otg = &motg->otg;
dev_dbg(dev, "OTG runtime idle\n");
/*
* It is observed some times that a spurious interrupt
* comes when PHY is put into LPM immediately after PHY reset.
* This 1 sec delay also prevents entering into LPM immediately
* after asynchronous interrupt.
*/
if (otg->state != OTG_STATE_UNDEFINED)
pm_schedule_suspend(dev, 1000);
return -EAGAIN;
}
static int msm_otg_runtime_suspend(struct device *dev)
{
struct msm_otg *motg = dev_get_drvdata(dev);
dev_dbg(dev, "OTG runtime suspend\n");
return msm_otg_suspend(motg);
}
static int msm_otg_runtime_resume(struct device *dev)
{
struct msm_otg *motg = dev_get_drvdata(dev);
dev_dbg(dev, "OTG runtime resume\n");
return msm_otg_resume(motg);
}
#endif
#ifdef CONFIG_PM_SLEEP
static int msm_otg_pm_suspend(struct device *dev)
{
struct msm_otg *motg = dev_get_drvdata(dev);
dev_dbg(dev, "OTG PM suspend\n");
return msm_otg_suspend(motg);
}
static int msm_otg_pm_resume(struct device *dev)
{
struct msm_otg *motg = dev_get_drvdata(dev);
int ret;
dev_dbg(dev, "OTG PM resume\n");
ret = msm_otg_resume(motg);
if (ret)
return ret;
/*
* Runtime PM Documentation recommends bringing the
* device to full powered state upon resume.
*/
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
}
#endif
#ifdef CONFIG_PM
static const struct dev_pm_ops msm_otg_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(msm_otg_pm_suspend, msm_otg_pm_resume)
SET_RUNTIME_PM_OPS(msm_otg_runtime_suspend, msm_otg_runtime_resume,
msm_otg_runtime_idle)
};
#endif
static struct platform_driver msm_otg_driver = {
.remove = __devexit_p(msm_otg_remove),
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
#ifdef CONFIG_PM
.pm = &msm_otg_dev_pm_ops,
#endif
},
};
static int __init msm_otg_init(void)
{
return platform_driver_probe(&msm_otg_driver, msm_otg_probe);
}
static void __exit msm_otg_exit(void)
{
platform_driver_unregister(&msm_otg_driver);
}
module_init(msm_otg_init);
module_exit(msm_otg_exit);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MSM USB transceiver driver");
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