This driver is used across all MSM SoCs. Hence give a generic name.
All Functions and strutures are also using "msm_otg" as prefix.
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
boolean "MIPS USB CI13xxx for MSM"
depends on ARCH_MSM
select USB_GADGET_DUALSPEED
- select USB_MSM_OTG_72K
+ select USB_MSM_OTG
help
MSM SoC has chipidea USB controller. This driver uses
ci13xxx_udc core.
bool "Support for MSM on-chip EHCI USB controller"
depends on USB_EHCI_HCD && ARCH_MSM
select USB_EHCI_ROOT_HUB_TT
- select USB_MSM_OTG_72K
+ select USB_MSM_OTG
---help---
Enables support for the USB Host controller present on the
Qualcomm chipsets. Root Hub has inbuilt TT.
To compile this driver as a module, choose M here: the
module will be called langwell_otg.
-config USB_MSM_OTG_72K
+config USB_MSM_OTG
tristate "OTG support for Qualcomm on-chip USB controller"
depends on (USB || USB_GADGET) && ARCH_MSM
select USB_OTG_UTILS
obj-$(CONFIG_USB_LANGWELL_OTG) += langwell_otg.o
obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
obj-$(CONFIG_USB_ULPI) += ulpi.o
-obj-$(CONFIG_USB_MSM_OTG_72K) += msm72k_otg.o
+obj-$(CONFIG_USB_MSM_OTG) += msm_otg.o
obj-$(CONFIG_AB8500_USB) += ab8500-usb.o
+++ /dev/null
-/* Copyright (c) 2009-2010, 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 <mach/clk.h>
-
-#define MSM_USB_BASE (motg->regs)
-#define DRIVER_NAME "msm_otg"
-
-#define ULPI_IO_TIMEOUT_USEC (10 * 1000)
-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);
- /*
- * 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).
- */
- ulpi_read(otg, 0x14);
-
- /*
- * 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.
- */
- if (pdata->otg_control == OTG_PHY_CONTROL)
- ulpi_write(otg, 0x01, 0x30);
-
- /*
- * PLL is not turned off when PHY enters into low power mode (LPM).
- * Disable PLL for maximum power savings.
- */
- 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);
-
- clk_disable(motg->pclk);
- clk_disable(motg->clk);
- if (motg->core_clk)
- clk_disable(motg->core_clk);
-
- 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;
-
- clk_enable(motg->pclk);
- clk_enable(motg->clk);
- if (motg->core_clk)
- clk_enable(motg->core_clk);
-
- 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);
-
- if (motg->async_int) {
- motg->async_int = 0;
- pm_runtime_put(otg->dev);
- enable_irq(motg->irq);
- }
-
- atomic_set(&motg->in_lpm, 0);
-
- dev_info(otg->dev, "USB exited from low power mode\n");
-
- return 0;
-}
-#endif
-
-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;
-}
-
-/*
- * 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) && otg->gadget) {
- msm_otg_start_peripheral(otg, 1);
- otg->state = OTG_STATE_B_PERIPHERAL;
- }
- 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_start_peripheral(otg, 0);
- 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;
- }
-
- 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_clk;
- }
-
- /*
- * 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);
- 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);
- 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->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);
-free_regs:
- iounmap(motg->regs);
-put_core_clk:
- if (motg->core_clk)
- clk_put(motg->core_clk);
- clk_put(motg->pclk);
-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_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);
-
- 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");
--- /dev/null
+/* Copyright (c) 2009-2010, 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 <mach/clk.h>
+
+#define MSM_USB_BASE (motg->regs)
+#define DRIVER_NAME "msm_otg"
+
+#define ULPI_IO_TIMEOUT_USEC (10 * 1000)
+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);
+ /*
+ * 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).
+ */
+ ulpi_read(otg, 0x14);
+
+ /*
+ * 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.
+ */
+ if (pdata->otg_control == OTG_PHY_CONTROL)
+ ulpi_write(otg, 0x01, 0x30);
+
+ /*
+ * PLL is not turned off when PHY enters into low power mode (LPM).
+ * Disable PLL for maximum power savings.
+ */
+ 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);
+
+ clk_disable(motg->pclk);
+ clk_disable(motg->clk);
+ if (motg->core_clk)
+ clk_disable(motg->core_clk);
+
+ 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;
+
+ clk_enable(motg->pclk);
+ clk_enable(motg->clk);
+ if (motg->core_clk)
+ clk_enable(motg->core_clk);
+
+ 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);
+
+ if (motg->async_int) {
+ motg->async_int = 0;
+ pm_runtime_put(otg->dev);
+ enable_irq(motg->irq);
+ }
+
+ atomic_set(&motg->in_lpm, 0);
+
+ dev_info(otg->dev, "USB exited from low power mode\n");
+
+ return 0;
+}
+#endif
+
+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;
+}
+
+/*
+ * 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) && otg->gadget) {
+ msm_otg_start_peripheral(otg, 1);
+ otg->state = OTG_STATE_B_PERIPHERAL;
+ }
+ 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_start_peripheral(otg, 0);
+ 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;
+ }
+
+ 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_clk;
+ }
+
+ /*
+ * 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);
+ 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);
+ 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->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);
+free_regs:
+ iounmap(motg->regs);
+put_core_clk:
+ if (motg->core_clk)
+ clk_put(motg->core_clk);
+ clk_put(motg->pclk);
+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_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);
+
+ 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");
/**
* struct msm_otg_platform_data - platform device data
- * for msm72k_otg driver.
+ * for msm_otg driver.
* @phy_init_seq: PHY configuration sequence. val, reg pairs
* terminated by -1.
* @vbus_power: VBUS power on/off routine.
projects / deliverable / linux.git / commitdiff
