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- /*
- * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
- * Author: Chao Xie <chao.xie@marvell.com>
- * Neil Zhang <zhangwm@marvell.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
- */
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/io.h>
- #include <linux/uaccess.h>
- #include <linux/device.h>
- #include <linux/proc_fs.h>
- #include <linux/clk.h>
- #include <linux/workqueue.h>
- #include <linux/platform_device.h>
- #include <linux/usb.h>
- #include <linux/usb/ch9.h>
- #include <linux/usb/otg.h>
- #include <linux/usb/gadget.h>
- #include <linux/usb/hcd.h>
- #include <linux/platform_data/mv_usb.h>
- #include "phy-mv-usb.h"
- #define DRIVER_DESC "Marvell USB OTG transceiver driver"
- #define DRIVER_VERSION "Jan 20, 2010"
- MODULE_DESCRIPTION(DRIVER_DESC);
- MODULE_VERSION(DRIVER_VERSION);
- MODULE_LICENSE("GPL");
- static const char driver_name[] = "mv-otg";
- static char *state_string[] = {
- "undefined",
- "b_idle",
- "b_srp_init",
- "b_peripheral",
- "b_wait_acon",
- "b_host",
- "a_idle",
- "a_wait_vrise",
- "a_wait_bcon",
- "a_host",
- "a_suspend",
- "a_peripheral",
- "a_wait_vfall",
- "a_vbus_err"
- };
- static int mv_otg_set_vbus(struct usb_otg *otg, bool on)
- {
- struct mv_otg *mvotg = container_of(otg->usb_phy, struct mv_otg, phy);
- if (mvotg->pdata->set_vbus == NULL)
- return -ENODEV;
- return mvotg->pdata->set_vbus(on);
- }
- static int mv_otg_set_host(struct usb_otg *otg,
- struct usb_bus *host)
- {
- otg->host = host;
- return 0;
- }
- static int mv_otg_set_peripheral(struct usb_otg *otg,
- struct usb_gadget *gadget)
- {
- otg->gadget = gadget;
- return 0;
- }
- static void mv_otg_run_state_machine(struct mv_otg *mvotg,
- unsigned long delay)
- {
- dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n");
- if (!mvotg->qwork)
- return;
- queue_delayed_work(mvotg->qwork, &mvotg->work, delay);
- }
- static void mv_otg_timer_await_bcon(unsigned long data)
- {
- struct mv_otg *mvotg = (struct mv_otg *) data;
- mvotg->otg_ctrl.a_wait_bcon_timeout = 1;
- dev_info(&mvotg->pdev->dev, "B Device No Response!\n");
- if (spin_trylock(&mvotg->wq_lock)) {
- mv_otg_run_state_machine(mvotg, 0);
- spin_unlock(&mvotg->wq_lock);
- }
- }
- static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id)
- {
- struct timer_list *timer;
- if (id >= OTG_TIMER_NUM)
- return -EINVAL;
- timer = &mvotg->otg_ctrl.timer[id];
- if (timer_pending(timer))
- del_timer(timer);
- return 0;
- }
- static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id,
- unsigned long interval,
- void (*callback) (unsigned long))
- {
- struct timer_list *timer;
- if (id >= OTG_TIMER_NUM)
- return -EINVAL;
- timer = &mvotg->otg_ctrl.timer[id];
- if (timer_pending(timer)) {
- dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id);
- return -EBUSY;
- }
- init_timer(timer);
- timer->data = (unsigned long) mvotg;
- timer->function = callback;
- timer->expires = jiffies + interval;
- add_timer(timer);
- return 0;
- }
- static int mv_otg_reset(struct mv_otg *mvotg)
- {
- unsigned int loops;
- u32 tmp;
- /* Stop the controller */
- tmp = readl(&mvotg->op_regs->usbcmd);
- tmp &= ~USBCMD_RUN_STOP;
- writel(tmp, &mvotg->op_regs->usbcmd);
- /* Reset the controller to get default values */
- writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd);
- loops = 500;
- while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
- if (loops == 0) {
- dev_err(&mvotg->pdev->dev,
- "Wait for RESET completed TIMEOUT\n");
- return -ETIMEDOUT;
- }
- loops--;
- udelay(20);
- }
- writel(0x0, &mvotg->op_regs->usbintr);
- tmp = readl(&mvotg->op_regs->usbsts);
- writel(tmp, &mvotg->op_regs->usbsts);
- return 0;
- }
- static void mv_otg_init_irq(struct mv_otg *mvotg)
- {
- u32 otgsc;
- mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID
- | OTGSC_INTR_A_VBUS_VALID;
- mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID
- | OTGSC_INTSTS_A_VBUS_VALID;
- if (mvotg->pdata->vbus == NULL) {
- mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID
- | OTGSC_INTR_B_SESSION_END;
- mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID
- | OTGSC_INTSTS_B_SESSION_END;
- }
- if (mvotg->pdata->id == NULL) {
- mvotg->irq_en |= OTGSC_INTR_USB_ID;
- mvotg->irq_status |= OTGSC_INTSTS_USB_ID;
- }
- otgsc = readl(&mvotg->op_regs->otgsc);
- otgsc |= mvotg->irq_en;
- writel(otgsc, &mvotg->op_regs->otgsc);
- }
- static void mv_otg_start_host(struct mv_otg *mvotg, int on)
- {
- #ifdef CONFIG_USB
- struct usb_otg *otg = mvotg->phy.otg;
- struct usb_hcd *hcd;
- if (!otg->host)
- return;
- dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop");
- hcd = bus_to_hcd(otg->host);
- if (on) {
- usb_add_hcd(hcd, hcd->irq, IRQF_SHARED);
- device_wakeup_enable(hcd->self.controller);
- } else {
- usb_remove_hcd(hcd);
- }
- #endif /* CONFIG_USB */
- }
- static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on)
- {
- struct usb_otg *otg = mvotg->phy.otg;
- if (!otg->gadget)
- return;
- dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off");
- if (on)
- usb_gadget_vbus_connect(otg->gadget);
- else
- usb_gadget_vbus_disconnect(otg->gadget);
- }
- static void otg_clock_enable(struct mv_otg *mvotg)
- {
- clk_prepare_enable(mvotg->clk);
- }
- static void otg_clock_disable(struct mv_otg *mvotg)
- {
- clk_disable_unprepare(mvotg->clk);
- }
- static int mv_otg_enable_internal(struct mv_otg *mvotg)
- {
- int retval = 0;
- if (mvotg->active)
- return 0;
- dev_dbg(&mvotg->pdev->dev, "otg enabled\n");
- otg_clock_enable(mvotg);
- if (mvotg->pdata->phy_init) {
- retval = mvotg->pdata->phy_init(mvotg->phy_regs);
- if (retval) {
- dev_err(&mvotg->pdev->dev,
- "init phy error %d\n", retval);
- otg_clock_disable(mvotg);
- return retval;
- }
- }
- mvotg->active = 1;
- return 0;
- }
- static int mv_otg_enable(struct mv_otg *mvotg)
- {
- if (mvotg->clock_gating)
- return mv_otg_enable_internal(mvotg);
- return 0;
- }
- static void mv_otg_disable_internal(struct mv_otg *mvotg)
- {
- if (mvotg->active) {
- dev_dbg(&mvotg->pdev->dev, "otg disabled\n");
- if (mvotg->pdata->phy_deinit)
- mvotg->pdata->phy_deinit(mvotg->phy_regs);
- otg_clock_disable(mvotg);
- mvotg->active = 0;
- }
- }
- static void mv_otg_disable(struct mv_otg *mvotg)
- {
- if (mvotg->clock_gating)
- mv_otg_disable_internal(mvotg);
- }
- static void mv_otg_update_inputs(struct mv_otg *mvotg)
- {
- struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
- u32 otgsc;
- otgsc = readl(&mvotg->op_regs->otgsc);
- if (mvotg->pdata->vbus) {
- if (mvotg->pdata->vbus->poll() == VBUS_HIGH) {
- otg_ctrl->b_sess_vld = 1;
- otg_ctrl->b_sess_end = 0;
- } else {
- otg_ctrl->b_sess_vld = 0;
- otg_ctrl->b_sess_end = 1;
- }
- } else {
- otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID);
- otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END);
- }
- if (mvotg->pdata->id)
- otg_ctrl->id = !!mvotg->pdata->id->poll();
- else
- otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID);
- if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id)
- otg_ctrl->a_bus_req = 1;
- otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID);
- otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID);
- dev_dbg(&mvotg->pdev->dev, "%s: ", __func__);
- dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id);
- dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld);
- dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end);
- dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld);
- dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld);
- }
- static void mv_otg_update_state(struct mv_otg *mvotg)
- {
- struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl;
- int old_state = mvotg->phy.otg->state;
- switch (old_state) {
- case OTG_STATE_UNDEFINED:
- mvotg->phy.otg->state = OTG_STATE_B_IDLE;
- /* FALL THROUGH */
- case OTG_STATE_B_IDLE:
- if (otg_ctrl->id == 0)
- mvotg->phy.otg->state = OTG_STATE_A_IDLE;
- else if (otg_ctrl->b_sess_vld)
- mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL;
- break;
- case OTG_STATE_B_PERIPHERAL:
- if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0)
- mvotg->phy.otg->state = OTG_STATE_B_IDLE;
- break;
- case OTG_STATE_A_IDLE:
- if (otg_ctrl->id)
- mvotg->phy.otg->state = OTG_STATE_B_IDLE;
- else if (!(otg_ctrl->a_bus_drop) &&
- (otg_ctrl->a_bus_req || otg_ctrl->a_srp_det))
- mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE;
- break;
- case OTG_STATE_A_WAIT_VRISE:
- if (otg_ctrl->a_vbus_vld)
- mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
- break;
- case OTG_STATE_A_WAIT_BCON:
- if (otg_ctrl->id || otg_ctrl->a_bus_drop
- || otg_ctrl->a_wait_bcon_timeout) {
- mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
- mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
- mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
- otg_ctrl->a_bus_req = 0;
- } else if (!otg_ctrl->a_vbus_vld) {
- mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
- mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
- mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
- } else if (otg_ctrl->b_conn) {
- mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER);
- mvotg->otg_ctrl.a_wait_bcon_timeout = 0;
- mvotg->phy.otg->state = OTG_STATE_A_HOST;
- }
- break;
- case OTG_STATE_A_HOST:
- if (otg_ctrl->id || !otg_ctrl->b_conn
- || otg_ctrl->a_bus_drop)
- mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON;
- else if (!otg_ctrl->a_vbus_vld)
- mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR;
- break;
- case OTG_STATE_A_WAIT_VFALL:
- if (otg_ctrl->id
- || (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld)
- || otg_ctrl->a_bus_req)
- mvotg->phy.otg->state = OTG_STATE_A_IDLE;
- break;
- case OTG_STATE_A_VBUS_ERR:
- if (otg_ctrl->id || otg_ctrl->a_clr_err
- || otg_ctrl->a_bus_drop) {
- otg_ctrl->a_clr_err = 0;
- mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL;
- }
- break;
- default:
- break;
- }
- }
- static void mv_otg_work(struct work_struct *work)
- {
- struct mv_otg *mvotg;
- struct usb_phy *phy;
- struct usb_otg *otg;
- int old_state;
- mvotg = container_of(to_delayed_work(work), struct mv_otg, work);
- run:
- /* work queue is single thread, or we need spin_lock to protect */
- phy = &mvotg->phy;
- otg = mvotg->phy.otg;
- old_state = otg->state;
- if (!mvotg->active)
- return;
- mv_otg_update_inputs(mvotg);
- mv_otg_update_state(mvotg);
- if (old_state != mvotg->phy.otg->state) {
- dev_info(&mvotg->pdev->dev, "change from state %s to %s\n",
- state_string[old_state],
- state_string[mvotg->phy.otg->state]);
- switch (mvotg->phy.otg->state) {
- case OTG_STATE_B_IDLE:
- otg->default_a = 0;
- if (old_state == OTG_STATE_B_PERIPHERAL)
- mv_otg_start_periphrals(mvotg, 0);
- mv_otg_reset(mvotg);
- mv_otg_disable(mvotg);
- usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
- break;
- case OTG_STATE_B_PERIPHERAL:
- mv_otg_enable(mvotg);
- mv_otg_start_periphrals(mvotg, 1);
- usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
- break;
- case OTG_STATE_A_IDLE:
- otg->default_a = 1;
- mv_otg_enable(mvotg);
- if (old_state == OTG_STATE_A_WAIT_VFALL)
- mv_otg_start_host(mvotg, 0);
- mv_otg_reset(mvotg);
- break;
- case OTG_STATE_A_WAIT_VRISE:
- mv_otg_set_vbus(otg, 1);
- break;
- case OTG_STATE_A_WAIT_BCON:
- if (old_state != OTG_STATE_A_HOST)
- mv_otg_start_host(mvotg, 1);
- mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER,
- T_A_WAIT_BCON,
- mv_otg_timer_await_bcon);
- /*
- * Now, we directly enter A_HOST. So set b_conn = 1
- * here. In fact, it need host driver to notify us.
- */
- mvotg->otg_ctrl.b_conn = 1;
- break;
- case OTG_STATE_A_HOST:
- break;
- case OTG_STATE_A_WAIT_VFALL:
- /*
- * Now, we has exited A_HOST. So set b_conn = 0
- * here. In fact, it need host driver to notify us.
- */
- mvotg->otg_ctrl.b_conn = 0;
- mv_otg_set_vbus(otg, 0);
- break;
- case OTG_STATE_A_VBUS_ERR:
- break;
- default:
- break;
- }
- goto run;
- }
- }
- static irqreturn_t mv_otg_irq(int irq, void *dev)
- {
- struct mv_otg *mvotg = dev;
- u32 otgsc;
- otgsc = readl(&mvotg->op_regs->otgsc);
- writel(otgsc, &mvotg->op_regs->otgsc);
- /*
- * if we have vbus, then the vbus detection for B-device
- * will be done by mv_otg_inputs_irq().
- */
- if (mvotg->pdata->vbus)
- if ((otgsc & OTGSC_STS_USB_ID) &&
- !(otgsc & OTGSC_INTSTS_USB_ID))
- return IRQ_NONE;
- if ((otgsc & mvotg->irq_status) == 0)
- return IRQ_NONE;
- mv_otg_run_state_machine(mvotg, 0);
- return IRQ_HANDLED;
- }
- static irqreturn_t mv_otg_inputs_irq(int irq, void *dev)
- {
- struct mv_otg *mvotg = dev;
- /* The clock may disabled at this time */
- if (!mvotg->active) {
- mv_otg_enable(mvotg);
- mv_otg_init_irq(mvotg);
- }
- mv_otg_run_state_machine(mvotg, 0);
- return IRQ_HANDLED;
- }
- static ssize_t
- get_a_bus_req(struct device *dev, struct device_attribute *attr, char *buf)
- {
- struct mv_otg *mvotg = dev_get_drvdata(dev);
- return scnprintf(buf, PAGE_SIZE, "%d\n",
- mvotg->otg_ctrl.a_bus_req);
- }
- static ssize_t
- set_a_bus_req(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct mv_otg *mvotg = dev_get_drvdata(dev);
- if (count > 2)
- return -1;
- /* We will use this interface to change to A device */
- if (mvotg->phy.otg->state != OTG_STATE_B_IDLE
- && mvotg->phy.otg->state != OTG_STATE_A_IDLE)
- return -1;
- /* The clock may disabled and we need to set irq for ID detected */
- mv_otg_enable(mvotg);
- mv_otg_init_irq(mvotg);
- if (buf[0] == '1') {
- mvotg->otg_ctrl.a_bus_req = 1;
- mvotg->otg_ctrl.a_bus_drop = 0;
- dev_dbg(&mvotg->pdev->dev,
- "User request: a_bus_req = 1\n");
- if (spin_trylock(&mvotg->wq_lock)) {
- mv_otg_run_state_machine(mvotg, 0);
- spin_unlock(&mvotg->wq_lock);
- }
- }
- return count;
- }
- static DEVICE_ATTR(a_bus_req, S_IRUGO | S_IWUSR, get_a_bus_req,
- set_a_bus_req);
- static ssize_t
- set_a_clr_err(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct mv_otg *mvotg = dev_get_drvdata(dev);
- if (!mvotg->phy.otg->default_a)
- return -1;
- if (count > 2)
- return -1;
- if (buf[0] == '1') {
- mvotg->otg_ctrl.a_clr_err = 1;
- dev_dbg(&mvotg->pdev->dev,
- "User request: a_clr_err = 1\n");
- }
- if (spin_trylock(&mvotg->wq_lock)) {
- mv_otg_run_state_machine(mvotg, 0);
- spin_unlock(&mvotg->wq_lock);
- }
- return count;
- }
- static DEVICE_ATTR(a_clr_err, S_IWUSR, NULL, set_a_clr_err);
- static ssize_t
- get_a_bus_drop(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- struct mv_otg *mvotg = dev_get_drvdata(dev);
- return scnprintf(buf, PAGE_SIZE, "%d\n",
- mvotg->otg_ctrl.a_bus_drop);
- }
- static ssize_t
- set_a_bus_drop(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct mv_otg *mvotg = dev_get_drvdata(dev);
- if (!mvotg->phy.otg->default_a)
- return -1;
- if (count > 2)
- return -1;
- if (buf[0] == '0') {
- mvotg->otg_ctrl.a_bus_drop = 0;
- dev_dbg(&mvotg->pdev->dev,
- "User request: a_bus_drop = 0\n");
- } else if (buf[0] == '1') {
- mvotg->otg_ctrl.a_bus_drop = 1;
- mvotg->otg_ctrl.a_bus_req = 0;
- dev_dbg(&mvotg->pdev->dev,
- "User request: a_bus_drop = 1\n");
- dev_dbg(&mvotg->pdev->dev,
- "User request: and a_bus_req = 0\n");
- }
- if (spin_trylock(&mvotg->wq_lock)) {
- mv_otg_run_state_machine(mvotg, 0);
- spin_unlock(&mvotg->wq_lock);
- }
- return count;
- }
- static DEVICE_ATTR(a_bus_drop, S_IRUGO | S_IWUSR,
- get_a_bus_drop, set_a_bus_drop);
- static struct attribute *inputs_attrs[] = {
- &dev_attr_a_bus_req.attr,
- &dev_attr_a_clr_err.attr,
- &dev_attr_a_bus_drop.attr,
- NULL,
- };
- static struct attribute_group inputs_attr_group = {
- .name = "inputs",
- .attrs = inputs_attrs,
- };
- static int mv_otg_remove(struct platform_device *pdev)
- {
- struct mv_otg *mvotg = platform_get_drvdata(pdev);
- sysfs_remove_group(&mvotg->pdev->dev.kobj, &inputs_attr_group);
- if (mvotg->qwork) {
- flush_workqueue(mvotg->qwork);
- destroy_workqueue(mvotg->qwork);
- }
- mv_otg_disable(mvotg);
- usb_remove_phy(&mvotg->phy);
- return 0;
- }
- static int mv_otg_probe(struct platform_device *pdev)
- {
- struct mv_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
- struct mv_otg *mvotg;
- struct usb_otg *otg;
- struct resource *r;
- int retval = 0, i;
- if (pdata == NULL) {
- dev_err(&pdev->dev, "failed to get platform data\n");
- return -ENODEV;
- }
- mvotg = devm_kzalloc(&pdev->dev, sizeof(*mvotg), GFP_KERNEL);
- if (!mvotg)
- return -ENOMEM;
- otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
- if (!otg)
- return -ENOMEM;
- platform_set_drvdata(pdev, mvotg);
- mvotg->pdev = pdev;
- mvotg->pdata = pdata;
- mvotg->clk = devm_clk_get(&pdev->dev, NULL);
- if (IS_ERR(mvotg->clk))
- return PTR_ERR(mvotg->clk);
- mvotg->qwork = create_singlethread_workqueue("mv_otg_queue");
- if (!mvotg->qwork) {
- dev_dbg(&pdev->dev, "cannot create workqueue for OTG\n");
- return -ENOMEM;
- }
- INIT_DELAYED_WORK(&mvotg->work, mv_otg_work);
- /* OTG common part */
- mvotg->pdev = pdev;
- mvotg->phy.dev = &pdev->dev;
- mvotg->phy.otg = otg;
- mvotg->phy.label = driver_name;
- otg->state = OTG_STATE_UNDEFINED;
- otg->usb_phy = &mvotg->phy;
- otg->set_host = mv_otg_set_host;
- otg->set_peripheral = mv_otg_set_peripheral;
- otg->set_vbus = mv_otg_set_vbus;
- for (i = 0; i < OTG_TIMER_NUM; i++)
- init_timer(&mvotg->otg_ctrl.timer[i]);
- r = platform_get_resource_byname(mvotg->pdev,
- IORESOURCE_MEM, "phyregs");
- if (r == NULL) {
- dev_err(&pdev->dev, "no phy I/O memory resource defined\n");
- retval = -ENODEV;
- goto err_destroy_workqueue;
- }
- mvotg->phy_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
- if (mvotg->phy_regs == NULL) {
- dev_err(&pdev->dev, "failed to map phy I/O memory\n");
- retval = -EFAULT;
- goto err_destroy_workqueue;
- }
- r = platform_get_resource_byname(mvotg->pdev,
- IORESOURCE_MEM, "capregs");
- if (r == NULL) {
- dev_err(&pdev->dev, "no I/O memory resource defined\n");
- retval = -ENODEV;
- goto err_destroy_workqueue;
- }
- mvotg->cap_regs = devm_ioremap(&pdev->dev, r->start, resource_size(r));
- if (mvotg->cap_regs == NULL) {
- dev_err(&pdev->dev, "failed to map I/O memory\n");
- retval = -EFAULT;
- goto err_destroy_workqueue;
- }
- /* we will acces controller register, so enable the udc controller */
- retval = mv_otg_enable_internal(mvotg);
- if (retval) {
- dev_err(&pdev->dev, "mv otg enable error %d\n", retval);
- goto err_destroy_workqueue;
- }
- mvotg->op_regs =
- (struct mv_otg_regs __iomem *) ((unsigned long) mvotg->cap_regs
- + (readl(mvotg->cap_regs) & CAPLENGTH_MASK));
- if (pdata->id) {
- retval = devm_request_threaded_irq(&pdev->dev, pdata->id->irq,
- NULL, mv_otg_inputs_irq,
- IRQF_ONESHOT, "id", mvotg);
- if (retval) {
- dev_info(&pdev->dev,
- "Failed to request irq for ID\n");
- pdata->id = NULL;
- }
- }
- if (pdata->vbus) {
- mvotg->clock_gating = 1;
- retval = devm_request_threaded_irq(&pdev->dev, pdata->vbus->irq,
- NULL, mv_otg_inputs_irq,
- IRQF_ONESHOT, "vbus", mvotg);
- if (retval) {
- dev_info(&pdev->dev,
- "Failed to request irq for VBUS, "
- "disable clock gating\n");
- mvotg->clock_gating = 0;
- pdata->vbus = NULL;
- }
- }
- if (pdata->disable_otg_clock_gating)
- mvotg->clock_gating = 0;
- mv_otg_reset(mvotg);
- mv_otg_init_irq(mvotg);
- r = platform_get_resource(mvotg->pdev, IORESOURCE_IRQ, 0);
- if (r == NULL) {
- dev_err(&pdev->dev, "no IRQ resource defined\n");
- retval = -ENODEV;
- goto err_disable_clk;
- }
- mvotg->irq = r->start;
- if (devm_request_irq(&pdev->dev, mvotg->irq, mv_otg_irq, IRQF_SHARED,
- driver_name, mvotg)) {
- dev_err(&pdev->dev, "Request irq %d for OTG failed\n",
- mvotg->irq);
- mvotg->irq = 0;
- retval = -ENODEV;
- goto err_disable_clk;
- }
- retval = usb_add_phy(&mvotg->phy, USB_PHY_TYPE_USB2);
- if (retval < 0) {
- dev_err(&pdev->dev, "can't register transceiver, %d\n",
- retval);
- goto err_disable_clk;
- }
- retval = sysfs_create_group(&pdev->dev.kobj, &inputs_attr_group);
- if (retval < 0) {
- dev_dbg(&pdev->dev,
- "Can't register sysfs attr group: %d\n", retval);
- goto err_remove_phy;
- }
- spin_lock_init(&mvotg->wq_lock);
- if (spin_trylock(&mvotg->wq_lock)) {
- mv_otg_run_state_machine(mvotg, 2 * HZ);
- spin_unlock(&mvotg->wq_lock);
- }
- dev_info(&pdev->dev,
- "successful probe OTG device %s clock gating.\n",
- mvotg->clock_gating ? "with" : "without");
- return 0;
- err_remove_phy:
- usb_remove_phy(&mvotg->phy);
- err_disable_clk:
- mv_otg_disable_internal(mvotg);
- err_destroy_workqueue:
- flush_workqueue(mvotg->qwork);
- destroy_workqueue(mvotg->qwork);
- return retval;
- }
- #ifdef CONFIG_PM
- static int mv_otg_suspend(struct platform_device *pdev, pm_message_t state)
- {
- struct mv_otg *mvotg = platform_get_drvdata(pdev);
- if (mvotg->phy.otg->state != OTG_STATE_B_IDLE) {
- dev_info(&pdev->dev,
- "OTG state is not B_IDLE, it is %d!\n",
- mvotg->phy.otg->state);
- return -EAGAIN;
- }
- if (!mvotg->clock_gating)
- mv_otg_disable_internal(mvotg);
- return 0;
- }
- static int mv_otg_resume(struct platform_device *pdev)
- {
- struct mv_otg *mvotg = platform_get_drvdata(pdev);
- u32 otgsc;
- if (!mvotg->clock_gating) {
- mv_otg_enable_internal(mvotg);
- otgsc = readl(&mvotg->op_regs->otgsc);
- otgsc |= mvotg->irq_en;
- writel(otgsc, &mvotg->op_regs->otgsc);
- if (spin_trylock(&mvotg->wq_lock)) {
- mv_otg_run_state_machine(mvotg, 0);
- spin_unlock(&mvotg->wq_lock);
- }
- }
- return 0;
- }
- #endif
- static struct platform_driver mv_otg_driver = {
- .probe = mv_otg_probe,
- .remove = mv_otg_remove,
- .driver = {
- .name = driver_name,
- },
- #ifdef CONFIG_PM
- .suspend = mv_otg_suspend,
- .resume = mv_otg_resume,
- #endif
- };
- module_platform_driver(mv_otg_driver);
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