![Arnd Bergmann](/assets/img/avatar_default.png)
The driver was recently adapted to a core API change, but the
change was incomplete, missing out the suspend helper and
leaving an extraneous local variable around:
usb/phy/phy-mv-usb.c: In function 'mv_otg_update_state':
usb/phy/phy-mv-usb.c:341:18: warning: unused variable 'phy' [-Wunused-variable]
usb/phy/phy-mv-usb.c: In function 'mv_otg_suspend':
usb/phy/phy-mv-usb.c:861:16: error: 'struct usb_phy' has no member named 'state'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: e47d92545c
("usb: move the OTG state from the USB PHY to the OTG structure")
Signed-off-by: Felipe Balbi <balbi@ti.com>
906 lines
21 KiB
C
906 lines
21 KiB
C
/*
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* Copyright (C) 2011 Marvell International Ltd. All rights reserved.
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* Author: Chao Xie <chao.xie@marvell.com>
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* Neil Zhang <zhangwm@marvell.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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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/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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#define DRIVER_VERSION "Jan 20, 2010"
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_VERSION(DRIVER_VERSION);
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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(unsigned long data)
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{
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struct mv_otg *mvotg = (struct mv_otg *) data;
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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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void (*callback) (unsigned long))
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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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init_timer(timer);
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timer->data = (unsigned long) mvotg;
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timer->function = callback;
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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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unsigned int loops;
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u32 tmp;
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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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loops = 500;
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while (readl(&mvotg->op_regs->usbcmd) & USBCMD_CTRL_RESET) {
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if (loops == 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 -ETIMEDOUT;
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}
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loops--;
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udelay(20);
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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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/* FALL THROUGH */
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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_phy *phy;
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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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phy = &mvotg->phy;
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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;
|
|
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);
|