path: root/drivers/usb/otg/mv_otg.c

/*
 * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
 * Author: Chao Xie <chao.xie@marvell.com>
 *	   Neil Zhang <zhangwm@marvell.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/uaccess.h>
#include <linux/device.h>
#include <linux/proc_fs.h>
#include <linux/clk.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>

#include <linux/usb.h>
#include <linux/usb/ch9.h>
#include <linux/usb/otg.h>
#include <linux/usb/gadget.h>
#include <linux/usb/hcd.h>
#include <linux/platform_data/mv_usb.h>

#include "mv_otg.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->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);