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fsl_otg.c

/*
 * Copyright 2005-2009 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * Author: Li Yang <LeoLi@freescale.com>
 *         Jerry Huang <Chang-Ming.Huang@freescale.com>
 *
 * Initialization based on code from Shlomi Gridish.
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the  GNU General Public License along
 * with this program; if not, write  to the Free Software Foundation, Inc.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/smp_lock.h>
#include <linux/proc_fs.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/reboot.h>
#include <linux/timer.h>
#include <linux/list.h>
#include <linux/usb.h>
#include <linux/device.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/workqueue.h>
#include <linux/time.h>
#include <linux/fsl_devices.h>
#include <linux/platform_device.h>

#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

#include "fsl_otg.h"

#define CONFIG_USB_OTG_DEBUG_FILES
#define DRIVER_VERSION "$Revision: 1.55 $"
#define DRIVER_AUTHOR "Jerry Huang/Li Yang"
#define DRIVER_DESC "Freescale USB OTG Driver"
#define DRIVER_INFO DRIVER_VERSION " " DRIVER_DESC

MODULE_DESCRIPTION("Freescale USB OTG Transceiver Driver");

static const char driver_name[] = "fsl-usb2-otg";

const pm_message_t otg_suspend_state = {
      .event = 1,
};

#define HA_DATA_PULSE 1

volatile static struct usb_dr_mmap *usb_dr_regs;
static struct fsl_otg *fsl_otg_dev;
static int srp_wait_done;

/* FSM timers */
struct fsl_otg_timer *a_wait_vrise_tmr, *a_wait_bcon_tmr, *a_aidl_bdis_tmr,
      *b_ase0_brst_tmr, *b_se0_srp_tmr;

/* Driver specific timers */
struct fsl_otg_timer *b_data_pulse_tmr, *b_vbus_pulse_tmr, *b_srp_fail_tmr,
      *b_srp_wait_tmr, *a_wait_enum_tmr;

static struct list_head active_timers;

static struct fsl_otg_config fsl_otg_initdata = {
      .otg_port = 1,
};

int write_ulpi(u8 addr, u8 data)
{
      u32 temp;
      temp = 0x60000000 | (addr << 16) | data;
      temp = cpu_to_le32(temp);
      usb_dr_regs->ulpiview = temp;
      return 0;
}

/* prototype declaration */
void fsl_otg_add_timer(void *timer);
void fsl_otg_del_timer(void *timer);

/* -------------------------------------------------------------*/
/* Operations that will be called from OTG Finite State Machine */

/* Charge vbus for vbus pulsing in SRP */
void fsl_otg_chrg_vbus(int on)
{
      if (on)
            usb_dr_regs->otgsc =
                cpu_to_le32((le32_to_cpu(usb_dr_regs->otgsc) &
                         ~OTGSC_INTSTS_MASK &
                         ~OTGSC_CTRL_VBUS_DISCHARGE) |
                        OTGSC_CTRL_VBUS_CHARGE);
      else
            usb_dr_regs->otgsc =
                cpu_to_le32((le32_to_cpu(usb_dr_regs->otgsc) &
                         ~OTGSC_INTSTS_MASK & ~OTGSC_CTRL_VBUS_CHARGE));
}

/* Discharge vbus through a resistor to ground */
void fsl_otg_dischrg_vbus(int on)
{
      if (on)
            usb_dr_regs->otgsc =
                cpu_to_le32((le32_to_cpu(usb_dr_regs->otgsc) &
                         ~OTGSC_INTSTS_MASK)
                        | OTGSC_CTRL_VBUS_DISCHARGE);
      else
            usb_dr_regs->otgsc =
                cpu_to_le32((le32_to_cpu(usb_dr_regs->otgsc) &
                         ~OTGSC_INTSTS_MASK &
                         ~OTGSC_CTRL_VBUS_DISCHARGE));
}

/* A-device driver vbus, controlled through PP bit in PORTSC */
void fsl_otg_drv_vbus(int on)
{
/*    if (on)
            usb_dr_regs->portsc =
                cpu_to_le32((le32_to_cpu(usb_dr_regs->portsc) &
                         ~PORTSC_W1C_BITS) | PORTSC_PORT_POWER);
      else
            usb_dr_regs->portsc =
                cpu_to_le32(le32_to_cpu(usb_dr_regs->portsc) &
                        ~PORTSC_W1C_BITS & ~PORTSC_PORT_POWER);
*/
}

/*
 * Pull-up D+, signalling connect by periperal. Also used in
 * data-line pulsing in SRP
 */
void fsl_otg_loc_conn(int on)
{
      if (on)
            usb_dr_regs->otgsc =
                cpu_to_le32((le32_to_cpu(usb_dr_regs->otgsc) &
                         ~OTGSC_INTSTS_MASK) | OTGSC_CTRL_DATA_PULSING);
      else
            usb_dr_regs->otgsc =
                cpu_to_le32(le32_to_cpu(usb_dr_regs->otgsc) &
                        ~OTGSC_INTSTS_MASK & ~OTGSC_CTRL_DATA_PULSING);
}

/* Generate SOF by host.  This is controlled through suspend/resume the
 * port.  In host mode, controller will automatically send SOF.
 * Suspend will block the data on the port.
 */
void fsl_otg_loc_sof(int on)
{
      u32 tmpval;

      tmpval = readl(&fsl_otg_dev->dr_mem_map->portsc) & ~PORTSC_W1C_BITS;
      if (on)
            tmpval |= PORTSC_PORT_FORCE_RESUME;
      else
            tmpval |= PORTSC_PORT_SUSPEND;
      writel(tmpval, &fsl_otg_dev->dr_mem_map->portsc);

}

/* Start SRP pulsing by data-line pulsing, followed with v-bus pulsing. */
void fsl_otg_start_pulse(void)
{
      srp_wait_done = 0;
#ifdef HA_DATA_PULSE
      usb_dr_regs->otgsc =
          cpu_to_le32((le32_to_cpu(usb_dr_regs->otgsc) & ~OTGSC_INTSTS_MASK)
                  | OTGSC_HA_DATA_PULSE);
#else
      fsl_otg_loc_conn(1);
#endif

      fsl_otg_add_timer(b_data_pulse_tmr);
}

void fsl_otg_pulse_vbus(void);

void b_data_pulse_end(unsigned long foo)
{
#ifdef HA_DATA_PULSE
#else
      fsl_otg_loc_conn(0);
#endif

      /* Do VBUS pulse after data pulse */
      fsl_otg_pulse_vbus();
}

void fsl_otg_pulse_vbus(void)
{
      srp_wait_done = 0;
      fsl_otg_chrg_vbus(1);
      /* start the timer to end vbus charge */
      fsl_otg_add_timer(b_vbus_pulse_tmr);
}

void b_vbus_pulse_end(unsigned long foo)
{
      fsl_otg_chrg_vbus(0);

      /* As USB3300 using the same a_sess_vld and b_sess_vld voltage
       * we need to discharge the bus for a while to distinguish
       * residual voltage of vbus pulsing and A device pull up */
      fsl_otg_dischrg_vbus(1);
      fsl_otg_add_timer(b_srp_wait_tmr);
}

void b_srp_end(unsigned long foo)
{
      fsl_otg_dischrg_vbus(0);
      srp_wait_done = 1;

      if ((fsl_otg_dev->otg.state == OTG_STATE_B_SRP_INIT) &&
          fsl_otg_dev->fsm.b_sess_vld)
            fsl_otg_dev->fsm.b_srp_done = 1;
}

/* Workaround for a_host suspending too fast.  When a_bus_req=0,
 * a_host will start by SRP.  It needs to set b_hnp_enable before
 * actually suspending to start HNP
 */
void a_wait_enum(unsigned long foo)
{
      VDBG("a_wait_enum timeout\n");
      if (!fsl_otg_dev->otg.host->b_hnp_enable)
            fsl_otg_add_timer(a_wait_enum_tmr);
      else
            otg_statemachine(&fsl_otg_dev->fsm);
}

/* ------------------------------------------------------*/

/* The timeout callback function to set time out bit */
void set_tmout(unsigned long indicator)
{
      *(int *)indicator = 1;
}

/* Initialize timers */
int fsl_otg_init_timers(struct otg_fsm *fsm)
{
      /* FSM used timers */
      a_wait_vrise_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_VRISE,
                        (unsigned long)&fsm->a_wait_vrise_tmout);
      if (a_wait_vrise_tmr == NULL)
            return -ENOMEM;

      a_wait_bcon_tmr = otg_timer_initializer(&set_tmout, TA_WAIT_BCON,
                        (unsigned long)&fsm->a_wait_bcon_tmout);
      if (a_wait_bcon_tmr == NULL)
            return -ENOMEM;

      a_aidl_bdis_tmr = otg_timer_initializer(&set_tmout, TA_AIDL_BDIS,
                        (unsigned long)&fsm->a_aidl_bdis_tmout);
      if (a_aidl_bdis_tmr == NULL)
            return -ENOMEM;

      b_ase0_brst_tmr = otg_timer_initializer(&set_tmout, TB_ASE0_BRST,
                        (unsigned long)&fsm->b_ase0_brst_tmout);
      if (b_ase0_brst_tmr == NULL)
            return -ENOMEM;

      b_se0_srp_tmr = otg_timer_initializer(&set_tmout, TB_SE0_SRP,
                        (unsigned long)&fsm->b_se0_srp);
      if (b_se0_srp_tmr == NULL)
            return -ENOMEM;

      b_srp_fail_tmr = otg_timer_initializer(&set_tmout, TB_SRP_FAIL,
                        (unsigned long)&fsm->b_srp_done);
      if (b_srp_fail_tmr == NULL)
            return -ENOMEM;

      a_wait_enum_tmr = otg_timer_initializer(&a_wait_enum, 10,
                        (unsigned long)&fsm);
      if (a_wait_enum_tmr == NULL)
            return -ENOMEM;

      /* device driver used timers */
      b_srp_wait_tmr = otg_timer_initializer(&b_srp_end, TB_SRP_WAIT, 0);
      if (b_srp_wait_tmr == NULL)
            return -ENOMEM;

      b_data_pulse_tmr = otg_timer_initializer(&b_data_pulse_end,
                        TB_DATA_PLS, 0);
      if (b_data_pulse_tmr == NULL)
            return -ENOMEM;

      b_vbus_pulse_tmr = otg_timer_initializer(&b_vbus_pulse_end,
                        TB_VBUS_PLS, 0);
      if (b_vbus_pulse_tmr == NULL)
            return -ENOMEM;

      return 0;
}

/* Uninitialize timers */
void fsl_otg_uninit_timers(void)
{
      /* FSM used timers */
      if (a_wait_vrise_tmr != NULL)
            kfree(a_wait_vrise_tmr);
      if (a_wait_bcon_tmr != NULL)
            kfree(a_wait_bcon_tmr);
      if (a_aidl_bdis_tmr != NULL)
            kfree(a_aidl_bdis_tmr);
      if (b_ase0_brst_tmr != NULL)
            kfree(b_ase0_brst_tmr);
      if (b_se0_srp_tmr != NULL)
            kfree(b_se0_srp_tmr);
      if (b_srp_fail_tmr != NULL)
            kfree(b_srp_fail_tmr);
      if (a_wait_enum_tmr != NULL)
            kfree(a_wait_enum_tmr);

      /* device driver used timers */
      if (b_srp_wait_tmr != NULL)
            kfree(b_srp_wait_tmr);
      if (b_data_pulse_tmr != NULL)
            kfree(b_data_pulse_tmr);
      if (b_vbus_pulse_tmr != NULL)
            kfree(b_vbus_pulse_tmr);
}

/* Add timer to timer list */
void fsl_otg_add_timer(void *gtimer)
{
      struct fsl_otg_timer *timer = (struct fsl_otg_timer *)gtimer;
      struct fsl_otg_timer *tmp_timer;

      /* Check if the timer is already in the active list,
       * if so update timer count
       */
      list_for_each_entry(tmp_timer, &active_timers, list)
          if (tmp_timer == timer) {
            timer->count = timer->expires;
            return;
      }
      timer->count = timer->expires;
      list_add_tail(&timer->list, &active_timers);
}

/* Remove timer from the timer list; clear timeout status */
void fsl_otg_del_timer(void *gtimer)
{
      struct fsl_otg_timer *timer = (struct fsl_otg_timer *)gtimer;
      struct fsl_otg_timer *tmp_timer, *del_tmp;

      list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list)
            if (tmp_timer == timer)
                  list_del(&timer->list);
}

/* Reduce timer count by 1, and find timeout conditions.
 * Called by fsl_otg 1ms timer interrupt
 */
int fsl_otg_tick_timer(void)
{
      struct fsl_otg_timer *tmp_timer, *del_tmp;
      int expired = 0;

      list_for_each_entry_safe(tmp_timer, del_tmp, &active_timers, list) {
            tmp_timer->count--;
            /* check if timer expires */
            if (!tmp_timer->count) {
                  list_del(&tmp_timer->list);
                  tmp_timer->function(tmp_timer->data);
                  expired = 1;
            }
      }

      return expired;
}

/* Reset controller, not reset the bus */
void otg_reset_controller(void)
{
      u32 command;

      command = readl(&usb_dr_regs->usbcmd);
      command |= (1 << 1);
      writel(command, &usb_dr_regs->usbcmd);
      while (readl(&usb_dr_regs->usbcmd) & (1 << 1)) ;
}

/* Call suspend/resume routines in host driver */
int fsl_otg_start_host(struct otg_fsm *fsm, int on)
{
      struct otg_transceiver *xceiv = fsm->transceiver;
      struct device *dev;
      struct fsl_otg *otg_dev = container_of(xceiv, struct fsl_otg, otg);
      struct platform_driver *host_pdrv;
      struct platform_device *host_pdev;
      u32 retval = 0;

      if (!xceiv->host)
            return -ENODEV;
      dev = xceiv->host->controller;
      host_pdrv = container_of((dev->driver), struct platform_driver, driver);
      host_pdev = to_platform_device(dev);

      /* Update a_vbus_vld state as a_vbus_vld int is disabled
       * in device mode
       */
      fsm->a_vbus_vld =
          (le32_to_cpu(usb_dr_regs->otgsc) & OTGSC_STS_A_VBUS_VALID) ? 1 : 0;
      if (on) {
            /* start fsl usb host controller */
            if (otg_dev->host_working)
                  goto end;
            else {
                  otg_reset_controller();
                  VDBG("host on......\n");
                  if (host_pdrv->resume) {
                        retval = host_pdrv->resume(host_pdev);
                        if (fsm->id) {
                              /* default-b */
                              fsl_otg_drv_vbus(1);
                              /* Workaround: b_host can't driver
                               * vbus, but PP in PORTSC needs to
                               * be 1 for host to work.
                               * So we set drv_vbus bit in
                               * transceiver to 0 thru ULPI. */
#if defined(CONFIG_ISP1504_MXC)
                              write_ulpi(0x0c, 0x20);
#endif
                        }
                  }

                  otg_dev->host_working = 1;
            }
      } else {
            /* stop fsl usb host controller */
            if (!otg_dev->host_working)
                  goto end;
            else {
                  VDBG("host off......\n");
                  if (host_pdrv->suspend) {
                        retval = host_pdrv->suspend(host_pdev,
                                          otg_suspend_state);
                        if (fsm->id)
                              /* default-b */
                              fsl_otg_drv_vbus(0);
                  }
                  otg_dev->host_working = 0;
            }
      }
end:
      return retval;
}

/* Call suspend and resume function in udc driver
 * to stop and start udc driver.
 */
int fsl_otg_start_gadget(struct otg_fsm *fsm, int on)
{
      struct otg_transceiver *xceiv = fsm->transceiver;
      struct device *dev;
      struct platform_driver *gadget_pdrv;
      struct platform_device *gadget_pdev;

      if (!xceiv->gadget || !xceiv->gadget->dev.parent)
            return -ENODEV;

      VDBG("gadget %s \n", on ? "on" : "off");
      dev = xceiv->gadget->dev.parent;

      gadget_pdrv = container_of((dev->driver),
                  struct platform_driver, driver);
      gadget_pdev = to_platform_device(dev);

      if (on)
            gadget_pdrv->resume(gadget_pdev);
      else
            gadget_pdrv->suspend(gadget_pdev, otg_suspend_state);

      return 0;
}

/* Called by initialization code of host driver.  Register host controller
 * to the OTG.  Suspend host for OTG role detection.
 */
static int fsl_otg_set_host(struct otg_transceiver *otg_p, struct usb_bus *host)
{
      struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);

      if (!otg_p || otg_dev != fsl_otg_dev)
            return -ENODEV;

      otg_p->host = host;

      otg_dev->fsm.a_bus_drop = 0;
      otg_dev->fsm.a_bus_req = 1;

      if (host) {
            VDBG("host off......\n");

            otg_p->host->otg_port = fsl_otg_initdata.otg_port;
            otg_p->host->is_b_host = otg_dev->fsm.id;
            /* must leave time for khubd to finish its thing
             * before yanking the host driver out from under it,
             * so suspend the host after a short delay.
             */
            otg_dev->host_working = 1;
            schedule_delayed_work(&otg_dev->otg_event, 100);
            return 0;
      } else {          /* host driver going away */

            if (!(le32_to_cpu(otg_dev->dr_mem_map->otgsc) &
                  OTGSC_STS_USB_ID)) {
                  /* Mini-A cable connected */
                  struct otg_fsm *fsm = &otg_dev->fsm;

                  otg_p->state = OTG_STATE_UNDEFINED;
                  fsm->protocol = PROTO_UNDEF;
            }
      }

      otg_dev->host_working = 0;

      otg_statemachine(&otg_dev->fsm);

      return 0;
}

/* Called by initialization code of udc.  Register udc to OTG.*/
static int fsl_otg_set_peripheral(struct otg_transceiver *otg_p,
                          struct usb_gadget *gadget)
{
      struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);

      VDBG("otg_dev 0x%x\n", (int)otg_dev);
      VDBG("fsl_otg_dev 0x%x\n", (int)fsl_otg_dev);

      if (!otg_p || otg_dev != fsl_otg_dev)
            return -ENODEV;

      if (!gadget) {
            if (!otg_dev->otg.default_a)
                  otg_p->gadget->ops->vbus_draw(otg_p->gadget, 0);
            usb_gadget_vbus_disconnect(otg_dev->otg.gadget);
            otg_dev->otg.gadget = 0;
            otg_dev->fsm.b_bus_req = 0;
            otg_statemachine(&otg_dev->fsm);
            return 0;
      }
#ifdef DEBUG
      /*
       * debug the initial state of the ID pin when only
       * the gadget driver is loaded and no cable is connected.
       * sometimes, we get an ID irq right
       * after the udc driver's otg_get_transceiver() call
       * that indicates that IDpin=0, which means a Mini-A
       * connector is attached.  not good.
       */
      DBG("before: fsm.id ID pin=%d", otg_dev->fsm.id);
      otg_dev->fsm.id = (otg_dev->dr_mem_map->otgsc & OTGSC_STS_USB_ID) ?
          1 : 0;
      DBG("after:  fsm.id ID pin=%d", otg_dev->fsm.id);
      /*if (!otg_dev->fsm.id) {
         printk("OTG Control = 0x%x\n",
         isp1504_read(ISP1504_OTGCTL,
         &otg_dev->dr_mem_map->ulpiview));
         } */
#endif

      otg_p->gadget = gadget;
      otg_p->gadget->is_a_peripheral = !otg_dev->fsm.id;

      otg_dev->fsm.b_bus_req = 1;

      /* start the gadget right away if the ID pin says Mini-B */
      DBG("ID pin=%d\n", otg_dev->fsm.id);
      if (otg_dev->fsm.id == 1) {
            fsl_otg_start_host(&otg_dev->fsm, 0);
            otg_drv_vbus(&otg_dev->fsm, 0);
            fsl_otg_start_gadget(&otg_dev->fsm, 1);
      }

      return 0;
}

/* Set OTG port power, only for B-device */
static int fsl_otg_set_power(struct otg_transceiver *otg_p, unsigned mA)
{
      if (!fsl_otg_dev)
            return -ENODEV;
      if (otg_p->state == OTG_STATE_B_PERIPHERAL)
            printk(KERN_INFO "FSL OTG:Draw %d mA\n", mA);

      return 0;
}

/* Delayed pin detect interrupt processing.
 *
 * When the Mini-A cable is disconnected from the board,
 * the pin-detect interrupt happens before the disconnnect
 * interrupts for the connected device(s).  In order to
 * process the disconnect interrupt(s) prior to switching
 * roles, the pin-detect interrupts are delayed, and handled
 * by this routine.
 */
static void fsl_otg_event(struct work_struct *work)
{
      struct fsl_otg *og = container_of(work, struct fsl_otg, otg_event.work);
      struct otg_fsm *fsm = &og->fsm;

      if (fsm->id) {          /* switch to gadget */
            fsl_otg_start_host(fsm, 0);
            otg_drv_vbus(fsm, 0);
            fsl_otg_start_gadget(fsm, 1);
      }
}

/* B-device start SRP */
static int fsl_otg_start_srp(struct otg_transceiver *otg_p)
{
      struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);

      if (!otg_p || otg_dev != fsl_otg_dev
          || otg_p->state != OTG_STATE_B_IDLE)
            return -ENODEV;

      otg_dev->fsm.b_bus_req = 1;
      otg_statemachine(&otg_dev->fsm);

      return 0;
}

/* A_host suspend will call this function to start hnp */
static int fsl_otg_start_hnp(struct otg_transceiver *otg_p)
{
      struct fsl_otg *otg_dev = container_of(otg_p, struct fsl_otg, otg);

      if (!otg_p || otg_dev != fsl_otg_dev)
            return -ENODEV;

      /* printk("start_hnp.............\n"); */
      /* clear a_bus_req to enter a_suspend state */
      otg_dev->fsm.a_bus_req = 0;
      otg_statemachine(&otg_dev->fsm);

      return 0;
}

/* Interrupt handler.  OTG/host/peripheral share the same int line.
 * OTG driver clears OTGSC interrupts and leaves USB interrupts
 * intact.  It needs to have knowledge of some USB interrupts
 * such as port change.
 */
irqreturn_t fsl_otg_isr(int irq, void *dev_id)
{
      struct otg_fsm *fsm = &((struct fsl_otg *)dev_id)->fsm;
      struct otg_transceiver *otg = &((struct fsl_otg *)dev_id)->otg;
      u32 otg_int_src, otg_sc;

      otg_sc = le32_to_cpu(usb_dr_regs->otgsc);
      otg_int_src = otg_sc & OTGSC_INTSTS_MASK & (otg_sc >> 8);

      /* Only clear otg interrupts */
      usb_dr_regs->otgsc |= cpu_to_le32(otg_sc & OTGSC_INTSTS_MASK);

      /*FIXME: ID change not generate when init to 0 */
      fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
      otg->default_a = (fsm->id == 0);

      /* process OTG interrupts */
      if (otg_int_src) {
            if (otg_int_src & OTGSC_INTSTS_USB_ID) {
                  fsm->id = (otg_sc & OTGSC_STS_USB_ID) ? 1 : 0;
                  otg->default_a = (fsm->id == 0);
                  /* clear conn information */
                  if (fsm->id)
                        fsm->b_conn = 0;
                  else
                        fsm->a_conn = 0;

                  if (otg->host)
                        otg->host->is_b_host = fsm->id;
                  if (otg->gadget)
                        otg->gadget->is_a_peripheral = !fsm->id;
                  VDBG("ID int (ID is %d)\n", fsm->id);

                  if (fsm->id) {    /* switch to gadget */
                        schedule_delayed_work(&((struct fsl_otg *)
                                          dev_id)->otg_event,
                                          100);
                  } else {    /* switch to host */
                        cancel_delayed_work(&
                                        ((struct fsl_otg *)dev_id)->
                                        otg_event);
                        fsl_otg_start_gadget(fsm, 0);
                        otg_drv_vbus(fsm, 1);
                        fsl_otg_start_host(fsm, 1);
                  }

                  return IRQ_HANDLED;
            }
      }

      return IRQ_NONE;
}

static struct otg_fsm_ops fsl_otg_ops = {
      .chrg_vbus = fsl_otg_chrg_vbus,
      .drv_vbus = fsl_otg_drv_vbus,
      .loc_conn = fsl_otg_loc_conn,
      .loc_sof = fsl_otg_loc_sof,
      .start_pulse = fsl_otg_start_pulse,

      .add_timer = fsl_otg_add_timer,
      .del_timer = fsl_otg_del_timer,

      .start_host = fsl_otg_start_host,
      .start_gadget = fsl_otg_start_gadget,
};

/* Initialize the global variable fsl_otg_dev and request IRQ for OTG */
static int fsl_otg_conf(struct platform_device *pdev)
{
      int status;
      struct fsl_otg *fsl_otg_tc;
      struct fsl_usb2_platform_data *pdata;

      pdata = pdev->dev.platform_data;

      DBG();

      if (fsl_otg_dev)
            return 0;

      /* allocate space to fsl otg device */
      fsl_otg_tc = kzalloc(sizeof(struct fsl_otg), GFP_KERNEL);
      if (!fsl_otg_tc)
            return -ENODEV;

      INIT_DELAYED_WORK(&fsl_otg_tc->otg_event, fsl_otg_event);

      INIT_LIST_HEAD(&active_timers);
      status = fsl_otg_init_timers(&fsl_otg_tc->fsm);
      if (status) {
            printk(KERN_INFO "Couldn't init OTG timers\n");
            fsl_otg_uninit_timers();
            kfree(fsl_otg_tc);
            return status;
      }
      spin_lock_init(&fsl_otg_tc->fsm.lock);

      /* Set OTG state machine operations */
      fsl_otg_tc->fsm.ops = &fsl_otg_ops;

      /* initialize the otg structure */
      fsl_otg_tc->otg.label = DRIVER_DESC;
      fsl_otg_tc->otg.set_host = fsl_otg_set_host;
      fsl_otg_tc->otg.set_peripheral = fsl_otg_set_peripheral;
      fsl_otg_tc->otg.set_power = fsl_otg_set_power;
      fsl_otg_tc->otg.start_hnp = fsl_otg_start_hnp;
      fsl_otg_tc->otg.start_srp = fsl_otg_start_srp;

      fsl_otg_dev = fsl_otg_tc;

      /* Store the otg transceiver */
      status = otg_set_transceiver(&fsl_otg_tc->otg);
      if (status) {
            printk(KERN_WARNING ": unable to register OTG transceiver.\n");
            return status;
      }

      return 0;
}

/* OTG Initialization*/
int usb_otg_start(struct platform_device *pdev)
{
      struct fsl_otg *p_otg;
      struct otg_transceiver *otg_trans = otg_get_transceiver();
      struct otg_fsm *fsm;
      volatile unsigned long *p;
      int status;
      struct resource *res;
      u32 temp;
      struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;

      p_otg = container_of(otg_trans, struct fsl_otg, otg);
      fsm = &p_otg->fsm;

      /* Initialize the state machine structure with default values */
      SET_OTG_STATE(otg_trans, OTG_STATE_UNDEFINED);
      fsm->transceiver = &p_otg->otg;

      /* We don't require predefined MEM/IRQ resource index */
      res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
      if (!res)
            return -ENXIO;

      /* We don't request_mem_region here to enable resource sharing
       * with host/device */

      usb_dr_regs = ioremap(res->start, sizeof(struct usb_dr_mmap));
      p_otg->dr_mem_map = (struct usb_dr_mmap *)usb_dr_regs;
      pdata->regs = (void *)usb_dr_regs;

      /* request irq */
      p_otg->irq = platform_get_irq(pdev, 0);
      status = request_irq(p_otg->irq, fsl_otg_isr,
                        IRQF_SHARED, driver_name, p_otg);
      if (status) {
            dev_dbg(p_otg->otg.dev, "can't get IRQ %d, error %d\n",
                  p_otg->irq, status);
            iounmap(p_otg->dr_mem_map);
            kfree(p_otg);
            return status;
      }

      if (pdata->platform_init && pdata->platform_init(pdev) != 0)
            return -EINVAL;


      /* Export DR controller resources */
      otg_set_resources(pdev->resource);

      /* stop the controller */
      temp = readl(&p_otg->dr_mem_map->usbcmd);
      temp &= ~USB_CMD_RUN_STOP;
      writel(temp, &p_otg->dr_mem_map->usbcmd);

      /* reset the controller */
      temp = readl(&p_otg->dr_mem_map->usbcmd);
      temp |= USB_CMD_CTRL_RESET;
      writel(temp, &p_otg->dr_mem_map->usbcmd);

      /* wait reset completed */
      while (readl(&p_otg->dr_mem_map->usbcmd) & USB_CMD_CTRL_RESET) ;

      /* configure the VBUSHS as IDLE(both host and device) */
      temp = USB_MODE_STREAM_DISABLE | (pdata->es ? USB_MODE_ES : 0);
      writel(temp, &p_otg->dr_mem_map->usbmode);

      /* configure PHY interface */
      temp = readl(&p_otg->dr_mem_map->portsc);
      temp &= ~(PORTSC_PHY_TYPE_SEL | PORTSC_PTW);
      switch (pdata->phy_mode) {
      case FSL_USB2_PHY_ULPI:
            temp |= PORTSC_PTS_ULPI;
            break;
      case FSL_USB2_PHY_UTMI_WIDE:
            temp |= PORTSC_PTW_16BIT;
            /* fall through */
      case FSL_USB2_PHY_UTMI:
            temp |= PORTSC_PTS_UTMI;
            /* fall through */
      default:
            break;
      }
      writel(temp, &p_otg->dr_mem_map->portsc);

      if (pdata->have_sysif_regs) {
            /* configure control enable IO output, big endian register */
            p = (volatile unsigned long *)(&p_otg->dr_mem_map->control);
            temp = *p;
            temp |= USB_CTRL_IOENB;
            *p = temp;
      }

      /* disable all interrupt and clear all OTGSC status */
      temp = readl(&p_otg->dr_mem_map->otgsc);
      temp &= ~OTGSC_INTERRUPT_ENABLE_BITS_MASK;
      temp |= OTGSC_INTERRUPT_STATUS_BITS_MASK | OTGSC_CTRL_VBUS_DISCHARGE;
      writel(temp, &p_otg->dr_mem_map->otgsc);


      /*
       * The identification (id) input is FALSE when a Mini-A plug is inserted
       * in the devices Mini-AB receptacle. Otherwise, this input is TRUE.
       * Also: record initial state of ID pin
       */
      if (le32_to_cpu(p_otg->dr_mem_map->otgsc) & OTGSC_STS_USB_ID) {
            p_otg->otg.state = OTG_STATE_UNDEFINED;
            p_otg->fsm.id = 1;
      } else {
            p_otg->otg.state = OTG_STATE_A_IDLE;
            p_otg->fsm.id = 0;
      }

      DBG("initial ID pin=%d\n", p_otg->fsm.id);

      /* enable OTG ID pin interrupt */
      temp = readl(&p_otg->dr_mem_map->otgsc);
      temp |= OTGSC_INTR_USB_ID_EN;
      temp &= ~(OTGSC_CTRL_VBUS_DISCHARGE | OTGSC_INTR_1MS_TIMER_EN);
      writel(temp, &p_otg->dr_mem_map->otgsc);

      return 0;
}

/*-------------------------------------------------------------------------
            PROC File System Support
-------------------------------------------------------------------------*/
#ifdef CONFIG_USB_OTG_DEBUG_FILES

#include <linux/seq_file.h>

static const char proc_filename[] = "driver/isp1504_otg";

static int otg_proc_read(char *page, char **start, off_t off, int count,
                   int *eof, void *_dev)
{
      struct otg_fsm *fsm = &fsl_otg_dev->fsm;
      char *buf = page;
      char *next = buf;
      unsigned size = count;
      unsigned long flags;
      int t;
      u32 tmp_reg;

      if (off != 0)
            return 0;

      spin_lock_irqsave(&fsm->lock, flags);

      /* ------basic driver infomation ---- */
      t = scnprintf(next, size,
                  DRIVER_DESC "\n" "fsl_usb2_otg version: %s\n\n",
                  DRIVER_VERSION);
      size -= t;
      next += t;

      /* ------ Registers ----- */
      tmp_reg = le32_to_cpu(usb_dr_regs->otgsc);
      t = scnprintf(next, size, "OTGSC reg: %08x\n", tmp_reg);
      size -= t;
      next += t;

      tmp_reg = le32_to_cpu(usb_dr_regs->portsc);
      t = scnprintf(next, size, "PORTSC reg: %08x\n", tmp_reg);
      size -= t;
      next += t;

      tmp_reg = le32_to_cpu(usb_dr_regs->usbmode);
      t = scnprintf(next, size, "USBMODE reg: %08x\n", tmp_reg);
      size -= t;
      next += t;

      tmp_reg = le32_to_cpu(usb_dr_regs->usbcmd);
      t = scnprintf(next, size, "USBCMD reg: %08x\n", tmp_reg);
      size -= t;
      next += t;

      tmp_reg = le32_to_cpu(usb_dr_regs->usbsts);
      t = scnprintf(next, size, "USBSTS reg: %08x\n", tmp_reg);
      size -= t;
      next += t;

      /* ------ State ----- */
      t = scnprintf(next, size,
                  "OTG state: %s\n\n",
                  state_string(fsl_otg_dev->otg.state));
      size -= t;
      next += t;

#if 1 || defined DEBUG
      /* ------ State Machine Variables ----- */
      t = scnprintf(next, size, "a_bus_req: %d\n", fsm->a_bus_req);
      size -= t;
      next += t;

      t = scnprintf(next, size, "b_bus_req: %d\n", fsm->b_bus_req);
      size -= t;
      next += t;

      t = scnprintf(next, size, "a_bus_resume: %d\n", fsm->a_bus_resume);
      size -= t;
      next += t;

      t = scnprintf(next, size, "a_bus_suspend: %d\n", fsm->a_bus_suspend);
      size -= t;
      next += t;

      t = scnprintf(next, size, "a_conn: %d\n", fsm->a_conn);
      size -= t;
      next += t;

      t = scnprintf(next, size, "a_sess_vld: %d\n", fsm->a_sess_vld);
      size -= t;
      next += t;

      t = scnprintf(next, size, "a_srp_det: %d\n", fsm->a_srp_det);
      size -= t;
      next += t;

      t = scnprintf(next, size, "a_vbus_vld: %d\n", fsm->a_vbus_vld);
      size -= t;
      next += t;

      t = scnprintf(next, size, "b_bus_resume: %d\n", fsm->b_bus_resume);
      size -= t;
      next += t;

      t = scnprintf(next, size, "b_bus_suspend: %d\n", fsm->b_bus_suspend);
      size -= t;
      next += t;

      t = scnprintf(next, size, "b_conn: %d\n", fsm->b_conn);
      size -= t;
      next += t;

      t = scnprintf(next, size, "b_se0_srp: %d\n", fsm->b_se0_srp);
      size -= t;
      next += t;

      t = scnprintf(next, size, "b_sess_end: %d\n", fsm->b_sess_end);
      size -= t;
      next += t;

      t = scnprintf(next, size, "b_sess_vld: %d\n", fsm->b_sess_vld);
      size -= t;
      next += t;

      t = scnprintf(next, size, "id: %d\n", fsm->id);
      size -= t;
      next += t;
#endif

      spin_unlock_irqrestore(&fsm->lock, flags);

      *eof = 1;
      return count - size;
}

#define create_proc_file()    create_proc_read_entry(proc_filename, \
                        0, NULL, otg_proc_read, NULL)

#define remove_proc_file()    remove_proc_entry(proc_filename, NULL)

#else                   /* !CONFIG_USB_OTG_DEBUG_FILES */

#define create_proc_file()    do {} while (0)
#define remove_proc_file()    do {} while (0)

#endif                        /*CONFIG_USB_OTG_DEBUG_FILES */

/*----------------------------------------------------------*/
/* Char driver interface to control some OTG input */

/* This function handle some ioctl command,such as get otg
 * status and set host suspend
 */
static int fsl_otg_ioctl(struct inode *inode, struct file *file,
                   unsigned int cmd, unsigned long arg)
{
      u32 retval = 0;

      switch (cmd) {
      case GET_OTG_STATUS:
            retval = fsl_otg_dev->host_working;
            break;

      case SET_A_SUSPEND_REQ:
            fsl_otg_dev->fsm.a_suspend_req = arg;
            break;

      case SET_A_BUS_DROP:
            fsl_otg_dev->fsm.a_bus_drop = arg;
            break;

      case SET_A_BUS_REQ:
            fsl_otg_dev->fsm.a_bus_req = arg;
            break;

      case SET_B_BUS_REQ:
            fsl_otg_dev->fsm.b_bus_req = arg;
            break;

      default:
            break;
      }

      otg_statemachine(&fsl_otg_dev->fsm);

      return retval;
}

static int fsl_otg_open(struct inode *inode, struct file *file)
{

      return 0;
}

static int fsl_otg_release(struct inode *inode, struct file *file)
{

      return 0;
}

static struct file_operations otg_fops = {
      .owner = THIS_MODULE,
      .llseek = NULL,
      .read = NULL,
      .write = NULL,
      .ioctl = fsl_otg_ioctl,
      .open = fsl_otg_open,
      .release = fsl_otg_release,
};

static int __init fsl_otg_probe(struct platform_device *pdev)
{
      int status;
      struct fsl_usb2_platform_data *pdata;

      DBG("pdev=0x%p\n", pdev);

      if (!pdev)
            return -ENODEV;

      if (!pdev->dev.platform_data)
            return -ENOMEM;

      pdata = pdev->dev.platform_data;

      /* configure the OTG */
      status = fsl_otg_conf(pdev);
      if (status) {
            printk(KERN_INFO "Couldn't init OTG module\n");
            return -status;
      }

      /* start OTG */
      status = usb_otg_start(pdev);

      if (register_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME, &otg_fops)) {
            printk(KERN_WARNING FSL_OTG_NAME
                   ": unable to register FSL OTG device\n");
            return -EIO;
      }

      create_proc_file();
      return status;
}

static int fsl_otg_remove(struct platform_device *pdev)
{
      struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;

      otg_set_transceiver(NULL);
      free_irq(fsl_otg_dev->irq, fsl_otg_dev);

      iounmap((void *)usb_dr_regs);

      kfree(fsl_otg_dev);

      remove_proc_file();

      unregister_chrdev(FSL_OTG_MAJOR, FSL_OTG_NAME);

      if (pdata->platform_uninit)
            pdata->platform_uninit(pdata);

      return 0;
}

struct platform_driver fsl_otg_driver = {
      .probe = fsl_otg_probe,
      .remove = fsl_otg_remove,
      .driver = {
            .name = driver_name,
            .owner = THIS_MODULE,
      },
};

/*-------------------------------------------------------------------------*/

static int __init fsl_usb_otg_init(void)
{
      printk(KERN_INFO DRIVER_DESC " loaded, %s\n", DRIVER_VERSION);
      return platform_driver_register(&fsl_otg_driver);
}

static void __exit fsl_usb_otg_exit(void)
{
      platform_driver_unregister(&fsl_otg_driver);
      printk(KERN_INFO DRIVER_DESC " unloaded\n");
}

module_init(fsl_usb_otg_init);
module_exit(fsl_usb_otg_exit);

MODULE_DESCRIPTION(DRIVER_INFO);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_LICENSE("GPL");

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