USB: Add MSM OTG Controller driver
This driver implements PHY initialization, clock management, ULPI IO ops
and simple OTG state machine to kick host/peripheral based on Id/VBUS
line status. VBUS/Id lines are tied to a reference voltage on some boards.
Hence provide debugfs interface to select host/peripheral mode.
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/otg/msm72k_otg.c b/drivers/usb/otg/msm72k_otg.c
new file mode 100644
index 0000000..46f468a
--- /dev/null
+++ b/drivers/usb/otg/msm72k_otg.c
@@ -0,0 +1,850 @@
+/* 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/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;
+}
+
+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) {
+ 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)
+ 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) {
+ 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)
+ 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;
+ }
+ 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;
+
+ 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");
+ } 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");
+ }
+
+ 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 msm_otg *motg = file->private_data;
+ 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;
+ }
+
+ 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");
+ }
+
+ 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;
+
+ if (otg->host || otg->gadget)
+ return -EBUSY;
+
+ msm_otg_debugfs_cleanup();
+ cancel_work_sync(&motg->sm_work);
+ device_init_wakeup(&pdev->dev, 0);
+ otg_set_transceiver(NULL);
+
+ free_irq(motg->irq, motg);
+
+ clk_disable(motg->pclk);
+ clk_disable(motg->clk);
+ if (motg->core_clk)
+ clk_disable(motg->core_clk);
+
+ iounmap(motg->regs);
+
+ 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;
+}
+
+static struct platform_driver msm_otg_driver = {
+ .remove = __devexit_p(msm_otg_remove),
+ .driver = {
+ .name = DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+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");