/* * Copyright (C) 2011 Marvell International Ltd. All rights reserved. * Author: Chao Xie * Neil Zhang * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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; struct usb_phy *phy = &mvotg->phy; 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); break; case OTG_STATE_B_PERIPHERAL: mv_otg_enable(mvotg); mv_otg_start_periphrals(mvotg, 1); 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) { dev_err(&pdev->dev, "failed to allocate memory!\n"); 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.state != OTG_STATE_B_IDLE) { dev_info(&pdev->dev, "OTG state is not B_IDLE, it is %d!\n", mvotg->phy.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 = { .owner = THIS_MODULE, .name = driver_name, }, #ifdef CONFIG_PM .suspend = mv_otg_suspend, .resume = mv_otg_resume, #endif }; module_platform_driver(mv_otg_driver);