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885 lines
20 KiB
885 lines
20 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved. |
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* Author: Chao Xie <[email protected]> |
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* Neil Zhang <[email protected]> |
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*/ |
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|
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/io.h> |
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#include <linux/iopoll.h> |
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#include <linux/uaccess.h> |
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#include <linux/device.h> |
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#include <linux/proc_fs.h> |
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#include <linux/clk.h> |
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#include <linux/workqueue.h> |
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#include <linux/platform_device.h> |
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#include <linux/usb.h> |
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#include <linux/usb/ch9.h> |
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#include <linux/usb/otg.h> |
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#include <linux/usb/gadget.h> |
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#include <linux/usb/hcd.h> |
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#include <linux/platform_data/mv_usb.h> |
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#include "phy-mv-usb.h" |
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#define DRIVER_DESC "Marvell USB OTG transceiver driver" |
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MODULE_DESCRIPTION(DRIVER_DESC); |
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MODULE_LICENSE("GPL"); |
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static const char driver_name[] = "mv-otg"; |
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static char *state_string[] = { |
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"undefined", |
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"b_idle", |
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"b_srp_init", |
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"b_peripheral", |
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"b_wait_acon", |
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"b_host", |
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"a_idle", |
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"a_wait_vrise", |
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"a_wait_bcon", |
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"a_host", |
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"a_suspend", |
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"a_peripheral", |
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"a_wait_vfall", |
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"a_vbus_err" |
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}; |
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static int mv_otg_set_vbus(struct usb_otg *otg, bool on) |
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{ |
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struct mv_otg *mvotg = container_of(otg->usb_phy, struct mv_otg, phy); |
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if (mvotg->pdata->set_vbus == NULL) |
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return -ENODEV; |
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return mvotg->pdata->set_vbus(on); |
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} |
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static int mv_otg_set_host(struct usb_otg *otg, |
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struct usb_bus *host) |
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{ |
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otg->host = host; |
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return 0; |
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} |
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static int mv_otg_set_peripheral(struct usb_otg *otg, |
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struct usb_gadget *gadget) |
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{ |
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otg->gadget = gadget; |
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return 0; |
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} |
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static void mv_otg_run_state_machine(struct mv_otg *mvotg, |
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unsigned long delay) |
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{ |
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dev_dbg(&mvotg->pdev->dev, "transceiver is updated\n"); |
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if (!mvotg->qwork) |
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return; |
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queue_delayed_work(mvotg->qwork, &mvotg->work, delay); |
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} |
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static void mv_otg_timer_await_bcon(struct timer_list *t) |
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{ |
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struct mv_otg *mvotg = from_timer(mvotg, t, |
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otg_ctrl.timer[A_WAIT_BCON_TIMER]); |
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mvotg->otg_ctrl.a_wait_bcon_timeout = 1; |
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dev_info(&mvotg->pdev->dev, "B Device No Response!\n"); |
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if (spin_trylock(&mvotg->wq_lock)) { |
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mv_otg_run_state_machine(mvotg, 0); |
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spin_unlock(&mvotg->wq_lock); |
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} |
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} |
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static int mv_otg_cancel_timer(struct mv_otg *mvotg, unsigned int id) |
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{ |
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struct timer_list *timer; |
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if (id >= OTG_TIMER_NUM) |
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return -EINVAL; |
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timer = &mvotg->otg_ctrl.timer[id]; |
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if (timer_pending(timer)) |
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del_timer(timer); |
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return 0; |
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} |
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static int mv_otg_set_timer(struct mv_otg *mvotg, unsigned int id, |
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unsigned long interval) |
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{ |
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struct timer_list *timer; |
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if (id >= OTG_TIMER_NUM) |
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return -EINVAL; |
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timer = &mvotg->otg_ctrl.timer[id]; |
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if (timer_pending(timer)) { |
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dev_err(&mvotg->pdev->dev, "Timer%d is already running\n", id); |
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return -EBUSY; |
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} |
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timer->expires = jiffies + interval; |
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add_timer(timer); |
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return 0; |
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} |
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static int mv_otg_reset(struct mv_otg *mvotg) |
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{ |
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u32 tmp; |
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int ret; |
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/* Stop the controller */ |
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tmp = readl(&mvotg->op_regs->usbcmd); |
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tmp &= ~USBCMD_RUN_STOP; |
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writel(tmp, &mvotg->op_regs->usbcmd); |
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/* Reset the controller to get default values */ |
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writel(USBCMD_CTRL_RESET, &mvotg->op_regs->usbcmd); |
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ret = readl_poll_timeout_atomic(&mvotg->op_regs->usbcmd, tmp, |
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(tmp & USBCMD_CTRL_RESET), 10, 10000); |
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if (ret < 0) { |
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dev_err(&mvotg->pdev->dev, |
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"Wait for RESET completed TIMEOUT\n"); |
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return ret; |
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} |
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writel(0x0, &mvotg->op_regs->usbintr); |
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tmp = readl(&mvotg->op_regs->usbsts); |
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writel(tmp, &mvotg->op_regs->usbsts); |
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return 0; |
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} |
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static void mv_otg_init_irq(struct mv_otg *mvotg) |
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{ |
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u32 otgsc; |
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mvotg->irq_en = OTGSC_INTR_A_SESSION_VALID |
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| OTGSC_INTR_A_VBUS_VALID; |
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mvotg->irq_status = OTGSC_INTSTS_A_SESSION_VALID |
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| OTGSC_INTSTS_A_VBUS_VALID; |
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if (mvotg->pdata->vbus == NULL) { |
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mvotg->irq_en |= OTGSC_INTR_B_SESSION_VALID |
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| OTGSC_INTR_B_SESSION_END; |
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mvotg->irq_status |= OTGSC_INTSTS_B_SESSION_VALID |
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| OTGSC_INTSTS_B_SESSION_END; |
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} |
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if (mvotg->pdata->id == NULL) { |
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mvotg->irq_en |= OTGSC_INTR_USB_ID; |
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mvotg->irq_status |= OTGSC_INTSTS_USB_ID; |
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} |
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otgsc = readl(&mvotg->op_regs->otgsc); |
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otgsc |= mvotg->irq_en; |
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writel(otgsc, &mvotg->op_regs->otgsc); |
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} |
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static void mv_otg_start_host(struct mv_otg *mvotg, int on) |
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{ |
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#ifdef CONFIG_USB |
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struct usb_otg *otg = mvotg->phy.otg; |
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struct usb_hcd *hcd; |
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if (!otg->host) |
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return; |
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dev_info(&mvotg->pdev->dev, "%s host\n", on ? "start" : "stop"); |
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hcd = bus_to_hcd(otg->host); |
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if (on) { |
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usb_add_hcd(hcd, hcd->irq, IRQF_SHARED); |
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device_wakeup_enable(hcd->self.controller); |
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} else { |
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usb_remove_hcd(hcd); |
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} |
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#endif /* CONFIG_USB */ |
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} |
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static void mv_otg_start_periphrals(struct mv_otg *mvotg, int on) |
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{ |
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struct usb_otg *otg = mvotg->phy.otg; |
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if (!otg->gadget) |
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return; |
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dev_info(mvotg->phy.dev, "gadget %s\n", on ? "on" : "off"); |
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if (on) |
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usb_gadget_vbus_connect(otg->gadget); |
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else |
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usb_gadget_vbus_disconnect(otg->gadget); |
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} |
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static void otg_clock_enable(struct mv_otg *mvotg) |
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{ |
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clk_prepare_enable(mvotg->clk); |
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} |
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static void otg_clock_disable(struct mv_otg *mvotg) |
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{ |
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clk_disable_unprepare(mvotg->clk); |
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} |
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static int mv_otg_enable_internal(struct mv_otg *mvotg) |
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{ |
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int retval = 0; |
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if (mvotg->active) |
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return 0; |
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dev_dbg(&mvotg->pdev->dev, "otg enabled\n"); |
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otg_clock_enable(mvotg); |
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if (mvotg->pdata->phy_init) { |
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retval = mvotg->pdata->phy_init(mvotg->phy_regs); |
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if (retval) { |
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dev_err(&mvotg->pdev->dev, |
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"init phy error %d\n", retval); |
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otg_clock_disable(mvotg); |
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return retval; |
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} |
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} |
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mvotg->active = 1; |
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return 0; |
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} |
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static int mv_otg_enable(struct mv_otg *mvotg) |
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{ |
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if (mvotg->clock_gating) |
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return mv_otg_enable_internal(mvotg); |
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return 0; |
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} |
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static void mv_otg_disable_internal(struct mv_otg *mvotg) |
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{ |
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if (mvotg->active) { |
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dev_dbg(&mvotg->pdev->dev, "otg disabled\n"); |
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if (mvotg->pdata->phy_deinit) |
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mvotg->pdata->phy_deinit(mvotg->phy_regs); |
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otg_clock_disable(mvotg); |
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mvotg->active = 0; |
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} |
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} |
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static void mv_otg_disable(struct mv_otg *mvotg) |
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{ |
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if (mvotg->clock_gating) |
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mv_otg_disable_internal(mvotg); |
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} |
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static void mv_otg_update_inputs(struct mv_otg *mvotg) |
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{ |
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struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl; |
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u32 otgsc; |
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otgsc = readl(&mvotg->op_regs->otgsc); |
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if (mvotg->pdata->vbus) { |
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if (mvotg->pdata->vbus->poll() == VBUS_HIGH) { |
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otg_ctrl->b_sess_vld = 1; |
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otg_ctrl->b_sess_end = 0; |
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} else { |
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otg_ctrl->b_sess_vld = 0; |
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otg_ctrl->b_sess_end = 1; |
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} |
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} else { |
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otg_ctrl->b_sess_vld = !!(otgsc & OTGSC_STS_B_SESSION_VALID); |
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otg_ctrl->b_sess_end = !!(otgsc & OTGSC_STS_B_SESSION_END); |
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} |
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if (mvotg->pdata->id) |
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otg_ctrl->id = !!mvotg->pdata->id->poll(); |
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else |
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otg_ctrl->id = !!(otgsc & OTGSC_STS_USB_ID); |
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if (mvotg->pdata->otg_force_a_bus_req && !otg_ctrl->id) |
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otg_ctrl->a_bus_req = 1; |
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otg_ctrl->a_sess_vld = !!(otgsc & OTGSC_STS_A_SESSION_VALID); |
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otg_ctrl->a_vbus_vld = !!(otgsc & OTGSC_STS_A_VBUS_VALID); |
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dev_dbg(&mvotg->pdev->dev, "%s: ", __func__); |
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dev_dbg(&mvotg->pdev->dev, "id %d\n", otg_ctrl->id); |
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dev_dbg(&mvotg->pdev->dev, "b_sess_vld %d\n", otg_ctrl->b_sess_vld); |
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dev_dbg(&mvotg->pdev->dev, "b_sess_end %d\n", otg_ctrl->b_sess_end); |
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dev_dbg(&mvotg->pdev->dev, "a_vbus_vld %d\n", otg_ctrl->a_vbus_vld); |
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dev_dbg(&mvotg->pdev->dev, "a_sess_vld %d\n", otg_ctrl->a_sess_vld); |
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} |
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static void mv_otg_update_state(struct mv_otg *mvotg) |
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{ |
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struct mv_otg_ctrl *otg_ctrl = &mvotg->otg_ctrl; |
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int old_state = mvotg->phy.otg->state; |
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switch (old_state) { |
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case OTG_STATE_UNDEFINED: |
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mvotg->phy.otg->state = OTG_STATE_B_IDLE; |
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fallthrough; |
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case OTG_STATE_B_IDLE: |
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if (otg_ctrl->id == 0) |
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mvotg->phy.otg->state = OTG_STATE_A_IDLE; |
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else if (otg_ctrl->b_sess_vld) |
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mvotg->phy.otg->state = OTG_STATE_B_PERIPHERAL; |
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break; |
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case OTG_STATE_B_PERIPHERAL: |
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if (!otg_ctrl->b_sess_vld || otg_ctrl->id == 0) |
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mvotg->phy.otg->state = OTG_STATE_B_IDLE; |
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break; |
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case OTG_STATE_A_IDLE: |
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if (otg_ctrl->id) |
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mvotg->phy.otg->state = OTG_STATE_B_IDLE; |
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else if (!(otg_ctrl->a_bus_drop) && |
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(otg_ctrl->a_bus_req || otg_ctrl->a_srp_det)) |
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_VRISE; |
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break; |
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case OTG_STATE_A_WAIT_VRISE: |
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if (otg_ctrl->a_vbus_vld) |
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON; |
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break; |
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case OTG_STATE_A_WAIT_BCON: |
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if (otg_ctrl->id || otg_ctrl->a_bus_drop |
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|| otg_ctrl->a_wait_bcon_timeout) { |
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mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER); |
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mvotg->otg_ctrl.a_wait_bcon_timeout = 0; |
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL; |
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otg_ctrl->a_bus_req = 0; |
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} else if (!otg_ctrl->a_vbus_vld) { |
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mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER); |
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mvotg->otg_ctrl.a_wait_bcon_timeout = 0; |
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mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR; |
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} else if (otg_ctrl->b_conn) { |
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mv_otg_cancel_timer(mvotg, A_WAIT_BCON_TIMER); |
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mvotg->otg_ctrl.a_wait_bcon_timeout = 0; |
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mvotg->phy.otg->state = OTG_STATE_A_HOST; |
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} |
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break; |
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case OTG_STATE_A_HOST: |
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if (otg_ctrl->id || !otg_ctrl->b_conn |
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|| otg_ctrl->a_bus_drop) |
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_BCON; |
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else if (!otg_ctrl->a_vbus_vld) |
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mvotg->phy.otg->state = OTG_STATE_A_VBUS_ERR; |
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break; |
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case OTG_STATE_A_WAIT_VFALL: |
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if (otg_ctrl->id |
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|| (!otg_ctrl->b_conn && otg_ctrl->a_sess_vld) |
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|| otg_ctrl->a_bus_req) |
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mvotg->phy.otg->state = OTG_STATE_A_IDLE; |
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break; |
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case OTG_STATE_A_VBUS_ERR: |
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if (otg_ctrl->id || otg_ctrl->a_clr_err |
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|| otg_ctrl->a_bus_drop) { |
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otg_ctrl->a_clr_err = 0; |
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mvotg->phy.otg->state = OTG_STATE_A_WAIT_VFALL; |
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} |
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break; |
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default: |
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break; |
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} |
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} |
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static void mv_otg_work(struct work_struct *work) |
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{ |
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struct mv_otg *mvotg; |
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struct usb_otg *otg; |
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int old_state; |
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mvotg = container_of(to_delayed_work(work), struct mv_otg, work); |
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run: |
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/* work queue is single thread, or we need spin_lock to protect */ |
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otg = mvotg->phy.otg; |
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old_state = otg->state; |
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if (!mvotg->active) |
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return; |
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mv_otg_update_inputs(mvotg); |
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mv_otg_update_state(mvotg); |
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if (old_state != mvotg->phy.otg->state) { |
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dev_info(&mvotg->pdev->dev, "change from state %s to %s\n", |
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state_string[old_state], |
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state_string[mvotg->phy.otg->state]); |
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switch (mvotg->phy.otg->state) { |
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case OTG_STATE_B_IDLE: |
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otg->default_a = 0; |
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if (old_state == OTG_STATE_B_PERIPHERAL) |
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mv_otg_start_periphrals(mvotg, 0); |
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mv_otg_reset(mvotg); |
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mv_otg_disable(mvotg); |
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usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE); |
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break; |
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case OTG_STATE_B_PERIPHERAL: |
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mv_otg_enable(mvotg); |
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mv_otg_start_periphrals(mvotg, 1); |
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usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED); |
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break; |
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case OTG_STATE_A_IDLE: |
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otg->default_a = 1; |
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mv_otg_enable(mvotg); |
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if (old_state == OTG_STATE_A_WAIT_VFALL) |
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mv_otg_start_host(mvotg, 0); |
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mv_otg_reset(mvotg); |
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break; |
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case OTG_STATE_A_WAIT_VRISE: |
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mv_otg_set_vbus(otg, 1); |
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break; |
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case OTG_STATE_A_WAIT_BCON: |
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if (old_state != OTG_STATE_A_HOST) |
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mv_otg_start_host(mvotg, 1); |
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mv_otg_set_timer(mvotg, A_WAIT_BCON_TIMER, |
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T_A_WAIT_BCON); |
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/* |
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* Now, we directly enter A_HOST. So set b_conn = 1 |
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* here. In fact, it need host driver to notify us. |
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*/ |
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mvotg->otg_ctrl.b_conn = 1; |
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break; |
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case OTG_STATE_A_HOST: |
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break; |
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case OTG_STATE_A_WAIT_VFALL: |
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/* |
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* Now, we has exited A_HOST. So set b_conn = 0 |
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* here. In fact, it need host driver to notify us. |
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*/ |
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mvotg->otg_ctrl.b_conn = 0; |
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mv_otg_set_vbus(otg, 0); |
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break; |
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case OTG_STATE_A_VBUS_ERR: |
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break; |
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default: |
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break; |
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} |
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goto run; |
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} |
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} |
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static irqreturn_t mv_otg_irq(int irq, void *dev) |
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{ |
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struct mv_otg *mvotg = dev; |
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u32 otgsc; |
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otgsc = readl(&mvotg->op_regs->otgsc); |
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writel(otgsc, &mvotg->op_regs->otgsc); |
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|
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/* |
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* if we have vbus, then the vbus detection for B-device |
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* will be done by mv_otg_inputs_irq(). |
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*/ |
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if (mvotg->pdata->vbus) |
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if ((otgsc & OTGSC_STS_USB_ID) && |
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!(otgsc & OTGSC_INTSTS_USB_ID)) |
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return IRQ_NONE; |
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|
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if ((otgsc & mvotg->irq_status) == 0) |
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return IRQ_NONE; |
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mv_otg_run_state_machine(mvotg, 0); |
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return IRQ_HANDLED; |
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} |
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static irqreturn_t mv_otg_inputs_irq(int irq, void *dev) |
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{ |
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struct mv_otg *mvotg = dev; |
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|
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/* The clock may disabled at this time */ |
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if (!mvotg->active) { |
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mv_otg_enable(mvotg); |
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mv_otg_init_irq(mvotg); |
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} |
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|
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mv_otg_run_state_machine(mvotg, 0); |
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|
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return IRQ_HANDLED; |
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} |
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|
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static ssize_t |
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a_bus_req_show(struct device *dev, struct device_attribute *attr, char *buf) |
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{ |
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struct mv_otg *mvotg = dev_get_drvdata(dev); |
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return scnprintf(buf, PAGE_SIZE, "%d\n", |
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mvotg->otg_ctrl.a_bus_req); |
|
} |
|
|
|
static ssize_t |
|
a_bus_req_store(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_RW(a_bus_req); |
|
|
|
static ssize_t |
|
a_clr_err_store(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_WO(a_clr_err); |
|
|
|
static ssize_t |
|
a_bus_drop_show(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 |
|
a_bus_drop_store(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_RW(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 const struct attribute_group inputs_attr_group = { |
|
.name = "inputs", |
|
.attrs = inputs_attrs, |
|
}; |
|
|
|
static const struct attribute_group *mv_otg_groups[] = { |
|
&inputs_attr_group, |
|
NULL, |
|
}; |
|
|
|
static int mv_otg_remove(struct platform_device *pdev) |
|
{ |
|
struct mv_otg *mvotg = platform_get_drvdata(pdev); |
|
|
|
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++) |
|
timer_setup(&mvotg->otg_ctrl.timer[i], |
|
mv_otg_timer_await_bcon, 0); |
|
|
|
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; |
|
} |
|
|
|
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_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, |
|
.dev_groups = mv_otg_groups, |
|
}, |
|
#ifdef CONFIG_PM |
|
.suspend = mv_otg_suspend, |
|
.resume = mv_otg_resume, |
|
#endif |
|
}; |
|
module_platform_driver(mv_otg_driver);
|
|
|