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ehci-arc.c

/*
 * Copyright (c) 2005 MontaVista Software
 *
 * 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.
 *
 * Ported to 834x by Randy Vinson <rvinson@mvista.com> using code provided
 * by Hunter Wu.
 */

#include <linux/platform_device.h>
#include <linux/fsl_devices.h>
#include <linux/usb/otg.h>

#include "ehci-fsl.h"
#include <mach/fsl_usb.h>

extern struct resource *otg_get_resources(void);

#undef EHCI_PROC_PTC
#ifdef EHCI_PROC_PTC          /* /proc PORTSC:PTC support */
/*
 * write a PORTSC:PTC value to /proc/driver/ehci-ptc
 * to put the controller into test mode.
 */
#include <linux/proc_fs.h>
#include <asm/uaccess.h>
#define EFPSL 3               /* ehci fsl proc string length */

static int ehci_fsl_proc_read(char *page, char **start, off_t off, int count,
                        int *eof, void *data)
{
      return 0;
}

static int ehci_fsl_proc_write(struct file *file, const char __user *buffer,
                         unsigned long count, void *data)
{
      int ptc;
      u32 portsc;
      struct ehci_hcd *ehci = (struct ehci_hcd *) data;
      char str[EFPSL] = {0};

      if (count > EFPSL-1)
            return -EINVAL;

      if (copy_from_user(str, buffer, count))
            return -EFAULT;

      str[count] = '\0';

      ptc = simple_strtoul(str, NULL, 0);

      portsc = ehci_readl(ehci, &ehci->regs->port_status[0]);
      portsc &= ~(0xf << 16);
      portsc |= (ptc << 16);
      printk(KERN_INFO "PTC %x  portsc %08x\n", ptc, portsc);

      ehci_writel(ehci, portsc, &ehci->regs->port_status[0]);

      return count;
}

static int ehci_testmode_init(struct ehci_hcd *ehci)
{
      struct proc_dir_entry *entry;

      entry = create_proc_read_entry("driver/ehci-ptc", 0644, NULL,
                               ehci_fsl_proc_read, ehci);
      if (!entry)
            return -ENODEV;

      entry->write_proc = ehci_fsl_proc_write;
      return 0;
}
#else
static int ehci_testmode_init(struct ehci_hcd *ehci)
{
      return 0;
}
#endif      /* /proc PORTSC:PTC support */


/* configure so an HC device and id are always provided */
/* always called with process context; sleeping is OK */

/**
 * usb_hcd_fsl_probe - initialize FSL-based HCDs
 * @drvier: Driver to be used for this HCD
 * @pdev: USB Host Controller being probed
 * Context: !in_interrupt()
 *
 * Allocates basic resources for this USB host controller.
 *
 */
int usb_hcd_fsl_probe(const struct hc_driver *driver,
                  struct platform_device *pdev)
{
      struct fsl_usb2_platform_data *pdata;
      struct usb_hcd *hcd;
      struct resource *res;
      int irq;
      int retval;

      pr_debug("initializing FSL-SOC USB Controller\n");

      /* Need platform data for setup */
      pdata = (struct fsl_usb2_platform_data *)pdev->dev.platform_data;
      if (!pdata) {
            dev_err(&pdev->dev,
                  "No platform data for %s.\n", dev_name(&pdev->dev));
            return -ENODEV;
      }

      /*
       * This is a host mode driver, verify that we're supposed to be
       * in host mode.
       */
      if (!((pdata->operating_mode == FSL_USB2_DR_HOST) ||
            (pdata->operating_mode == FSL_USB2_MPH_HOST) ||
            (pdata->operating_mode == FSL_USB2_DR_OTG))) {
            dev_err(&pdev->dev,
                  "Non Host Mode configured for %s. Wrong driver linked.\n",
                  dev_name(&pdev->dev));
            return -ENODEV;
      }

      hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
      if (!hcd) {
            retval = -ENOMEM;
            goto err1;
      }

#if defined(CONFIG_USB_OTG)
      if (pdata->operating_mode == FSL_USB2_DR_OTG) {
            res = otg_get_resources();
            if (!res) {
                  dev_err(&pdev->dev,
                        "Found HC with no IRQ. Check %s setup!\n",
                        dev_name(&pdev->dev));
                  return -ENODEV;
            }
            irq = res[1].start;
            hcd->rsrc_start = res[0].start;
            hcd->rsrc_len = res[0].end - res[0].start + 1;
      } else
#endif
      {
            res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
            if (!res) {
                  dev_err(&pdev->dev,
                        "Found HC with no IRQ. Check %s setup!\n",
                        dev_name(&pdev->dev));
                  return -ENODEV;
            }
            irq = res->start;

            res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
            hcd->rsrc_start = res->start;
            hcd->rsrc_len = resource_size(res);

            if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
                              driver->description)) {
                  dev_dbg(&pdev->dev, "controller already in use\n");
                  retval = -EBUSY;
                  goto err2;
            }
      }

      hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);

      if (hcd->regs == NULL) {
            dev_dbg(&pdev->dev, "error mapping memory\n");
            retval = -EFAULT;
            goto err3;
      }
      pdata->regs = hcd->regs;

      /*
       * do platform specific init: check the clock, grab/config pins, etc.
       */
      if (pdata->platform_init && pdata->platform_init(pdev)) {
            retval = -ENODEV;
            goto err3;
      }

      fsl_platform_set_host_mode(hcd);
      hcd->power_budget = pdata->power_budget;

      retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
      if (retval != 0)
            goto err4;

      fsl_platform_set_vbus_power(pdata, 1);

#ifdef CONFIG_USB_OTG
      if (pdata->operating_mode == FSL_USB2_DR_OTG) {
            struct ehci_hcd *ehci = hcd_to_ehci(hcd);

            dbg("pdev=0x%p  hcd=0x%p  ehci=0x%p\n", pdev, hcd, ehci);

            ehci->transceiver = otg_get_transceiver();
            dbg("ehci->transceiver=0x%p\n", ehci->transceiver);

            if (ehci->transceiver) {
                  retval = otg_set_host(ehci->transceiver,
                                    &ehci_to_hcd(ehci)->self);
                  if (retval) {
                        if (ehci->transceiver)
                              put_device(ehci->transceiver->dev);
                        goto err4;
                  }
            } else {
                  printk(KERN_ERR "can't find transceiver\n");
                  retval = -ENODEV;
                  goto err4;
            }
      }
#endif

      if (pdata->suspended) {
            pdata->suspended = 0;
            if (pdata->already_suspended)
                  pdata->already_suspended = 0;
      }

      fsl_platform_set_ahb_burst(hcd);
      ehci_testmode_init(hcd_to_ehci(hcd));
      return retval;

err4:
      iounmap(hcd->regs);
err3:
      if (pdata->operating_mode != FSL_USB2_DR_OTG)
            release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
err2:
      usb_put_hcd(hcd);
err1:
      dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), retval);
      if (pdata->platform_uninit)
            pdata->platform_uninit(pdata);
      return retval;
}

/* may be called without controller electrically present */
/* may be called with controller, bus, and devices active */

/**
 * usb_hcd_fsl_remove - shutdown processing for FSL-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_fsl_probe().
 *
 */
static void usb_hcd_fsl_remove(struct usb_hcd *hcd,
                         struct platform_device *pdev)
{
      struct ehci_hcd *ehci = hcd_to_ehci(hcd);
      struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
      u32 tmp;

      if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
            /* Need open clock for register access */
            if (pdata->usb_clock_for_pm)
                  pdata->usb_clock_for_pm(true);

            tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);
            if (tmp & PORT_PHCD) {
                  tmp &= ~PORT_PHCD;
                  ehci_writel(ehci, tmp, &ehci->regs->port_status[0]);
                  msleep(100);

                  if (pdata->usb_clock_for_pm)
                        pdata->usb_clock_for_pm(false);
            }
      }

      /* DDD shouldn't we turn off the power here? */
      fsl_platform_set_vbus_power(pdata, 0);

      if (ehci->transceiver) {
            (void)otg_set_host(ehci->transceiver, 0);
            put_device(ehci->transceiver->dev);
      } else {
            release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
      }

      usb_remove_hcd(hcd);
      usb_put_hcd(hcd);

      /*
       * do platform specific un-initialization:
       * release iomux pins, etc.
       */
      if (pdata->platform_uninit)
            pdata->platform_uninit(pdata);

      iounmap(hcd->regs);
}

static void fsl_setup_phy(struct ehci_hcd *ehci,
                    enum fsl_usb2_phy_modes phy_mode, int port_offset)
{
      u32 portsc;

      portsc = ehci_readl(ehci, &ehci->regs->port_status[port_offset]);
      portsc &= ~(PORT_PTS_MSK | PORT_PTS_PTW);

      switch (phy_mode) {
      case FSL_USB2_PHY_ULPI:
            portsc |= PORT_PTS_ULPI;
            break;
      case FSL_USB2_PHY_SERIAL:
            portsc |= PORT_PTS_SERIAL;
            break;
      case FSL_USB2_PHY_UTMI_WIDE:
            portsc |= PORT_PTS_PTW;
            /* fall through */
      case FSL_USB2_PHY_UTMI:
            portsc |= PORT_PTS_UTMI;
            break;
      case FSL_USB2_PHY_NONE:
            break;
      }
      ehci_writel(ehci, portsc, &ehci->regs->port_status[port_offset]);
}

/* called after powerup, by probe or system-pm "wakeup" */
static int ehci_fsl_reinit(struct ehci_hcd *ehci)
{
      fsl_platform_usb_setup(ehci);
      ehci_port_power(ehci, 0);

      return 0;
}

/* called during probe() after chip reset completes */
static int ehci_fsl_setup(struct usb_hcd *hcd)
{
      struct ehci_hcd *ehci = hcd_to_ehci(hcd);
      int retval;

      /* EHCI registers start at offset 0x100 */
      ehci->caps = hcd->regs + 0x100;
      ehci->regs = hcd->regs + 0x100 +
          HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
      dbg_hcs_params(ehci, "reset");
      dbg_hcc_params(ehci, "reset");

      /* cache this readonly data; minimize chip reads */
      ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);

      retval = ehci_halt(ehci);
      if (retval)
            return retval;

      /* data structure init */
      retval = ehci_init(hcd);
      if (retval)
            return retval;

      hcd->has_tt = 1;

      ehci->sbrn = 0x20;

      ehci_reset(ehci);

      retval = ehci_fsl_reinit(ehci);
      return retval;
}

static const struct hc_driver ehci_fsl_hc_driver = {
      .description = hcd_name,
      .product_desc = "Freescale On-Chip EHCI Host Controller",
      .hcd_priv_size = sizeof(struct ehci_hcd),

      /*
       * generic hardware linkage
       */
      .irq = ehci_irq,
      .flags = HCD_USB2,

      /*
       * basic lifecycle operations
       */
      .reset = ehci_fsl_setup,
      .start = ehci_run,
      .stop = ehci_stop,
      .shutdown = ehci_shutdown,

      /*
       * managing i/o requests and associated device resources
       */
      .urb_enqueue = ehci_urb_enqueue,
      .urb_dequeue = ehci_urb_dequeue,
      .endpoint_disable = ehci_endpoint_disable,
      .endpoint_reset = ehci_endpoint_reset,

      /*
       * scheduling support
       */
      .get_frame_number = ehci_get_frame,

      /*
       * root hub support
       */
      .hub_status_data = ehci_hub_status_data,
      .hub_control = ehci_hub_control,
      .bus_suspend = ehci_bus_suspend,
      .bus_resume = ehci_bus_resume,
      .start_port_reset = ehci_start_port_reset,
      .relinquish_port = ehci_relinquish_port,
      .port_handed_over = ehci_port_handed_over,

      .clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};

static int ehci_fsl_drv_probe(struct platform_device *pdev)
{
      if (usb_disabled())
            return -ENODEV;

      /* FIXME we only want one one probe() not two */
      return usb_hcd_fsl_probe(&ehci_fsl_hc_driver, pdev);
}

static int ehci_fsl_drv_remove(struct platform_device *pdev)
{
      struct usb_hcd *hcd = platform_get_drvdata(pdev);

      /* FIXME we only want one one remove() not two */
      usb_hcd_fsl_remove(hcd, pdev);
      return 0;
}

#ifdef CONFIG_PM
/* suspend/resume, section 4.3 */

/* These routines rely on the bus (pci, platform, etc)
 * to handle powerdown and wakeup, and currently also on
 * transceivers that don't need any software attention to set up
 * the right sort of wakeup.
 *
 * They're also used for turning on/off the port when doing OTG.
 */
static int ehci_fsl_drv_suspend(struct platform_device *pdev,
                        pm_message_t message)
{
      struct usb_hcd *hcd = platform_get_drvdata(pdev);
      struct ehci_hcd *ehci = hcd_to_ehci(hcd);
      u32 tmp, port_status;
      struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;

      if (device_may_wakeup(&(pdev->dev))) {
            /* Need open clock for register access */
            if (pdata->usb_clock_for_pm)
                  pdata->usb_clock_for_pm(true);
      }

#ifdef DEBUG
      u32 mode = ehci_readl(ehci, hcd->regs + FSL_SOC_USB_USBMODE);
      mode &= USBMODE_CM_MASK;
      tmp = ehci_readl(ehci, hcd->regs + 0x140);      /* usbcmd */

      printk(KERN_DEBUG "%s('%s'): suspend=%d already_suspended=%d "
             "mode=%d  usbcmd %08x\n", __func__, pdata->name,
             pdata->suspended, pdata->already_suspended, mode, tmp);
#endif

      /*
       * If the controller is already suspended, then this must be a
       * PM suspend.  Remember this fact, so that we will leave the
       * controller suspended at PM resume time.
       */
      if (pdata->suspended) {
            pr_debug("%s: already suspended, leaving early\n", __func__);
            pdata->already_suspended = 1;
            goto err1;
      }

      pr_debug("%s: suspending...\n", __func__);

      printk(KERN_INFO "USB Host suspended\n");

      port_status = ehci_readl(ehci, &ehci->regs->port_status[0]);
      pdev->dev.power.power_state = PMSG_SUSPEND;

      /* ignore non-host interrupts */
      clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);

      /* save EHCI registers */
      pdata->pm_command = ehci_readl(ehci, &ehci->regs->command);
      pdata->pm_command &= ~CMD_RUN;
      pdata->pm_status  = ehci_readl(ehci, &ehci->regs->status);
      pdata->pm_intr_enable  = ehci_readl(ehci, &ehci->regs->intr_enable);
      pdata->pm_frame_index  = ehci_readl(ehci, &ehci->regs->frame_index);
      pdata->pm_segment  = ehci_readl(ehci, &ehci->regs->segment);
      pdata->pm_frame_list  = ehci_readl(ehci, &ehci->regs->frame_list);
      pdata->pm_async_next  = ehci_readl(ehci, &ehci->regs->async_next);
      pdata->pm_configured_flag  =
            ehci_readl(ehci, &ehci->regs->configured_flag);
      pdata->pm_portsc = ehci_readl(ehci, &ehci->regs->port_status[0]);

      /* clear the W1C bits */
      pdata->pm_portsc &= cpu_to_hc32(ehci, ~PORT_RWC_BITS);

      /* clear PHCD bit */
      pdata->pm_portsc &= ~PORT_PHCD;

      pdata->suspended = 1;

      if (!device_may_wakeup(&(pdev->dev))) {
            /* clear PP to cut power to the port */
            tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);
            tmp &= ~PORT_POWER;
            ehci_writel(ehci, tmp, &ehci->regs->port_status[0]);
            goto err1;
      }

      tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);

      if (pdata->platform_suspend)
            pdata->platform_suspend(pdata);
err1:
      if (device_may_wakeup(&(pdev->dev))) {
            if (pdata->usb_clock_for_pm)
                  pdata->usb_clock_for_pm(false);
      }
      return 0;
}

static int ehci_fsl_drv_resume(struct platform_device *pdev)
{
      struct usb_hcd *hcd = platform_get_drvdata(pdev);
      struct ehci_hcd *ehci = hcd_to_ehci(hcd);
      u32 tmp;
      struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;

      pr_debug("%s('%s'): suspend=%d already_suspended=%d\n", __func__,
            pdata->name, pdata->suspended, pdata->already_suspended);

      /*
       * If the controller was already suspended at suspend time,
       * then don't resume it now.
       */
      if (pdata->already_suspended) {
            pr_debug("already suspended, leaving early\n");
            pdata->already_suspended = 0;
            return 0;
      }

      if (!pdata->suspended) {
            pr_debug("not suspended, leaving early\n");
            return 0;
      }

      /* If hcd is resumed by non-usb wakeup events,
       * then usb clocks are still not open when come here */
      if (device_may_wakeup(&(pdev->dev))) {
            /* Need open clock for register access */
            if (pdata->usb_clock_for_pm)
                  pdata->usb_clock_for_pm(true);
      }

      tmp = ehci_readl(ehci, &ehci->regs->port_status[0]);

      pdata->suspended = 0;

      pr_debug("%s resuming...\n", __func__);

      /* set host mode */
      fsl_platform_set_host_mode(hcd);

      if (pdata->platform_resume)
            pdata->platform_resume(pdata);

      /* restore EHCI registers */
      ehci_writel(ehci, pdata->pm_portsc, &ehci->regs->port_status[0]);
      ehci_writel(ehci, pdata->pm_command, &ehci->regs->command);
      ehci_writel(ehci, pdata->pm_intr_enable, &ehci->regs->intr_enable);
      ehci_writel(ehci, pdata->pm_frame_index, &ehci->regs->frame_index);
      ehci_writel(ehci, pdata->pm_segment, &ehci->regs->segment);
      ehci_writel(ehci, pdata->pm_frame_list, &ehci->regs->frame_list);
      ehci_writel(ehci, pdata->pm_async_next, &ehci->regs->async_next);
      ehci_writel(ehci, pdata->pm_configured_flag,
                &ehci->regs->configured_flag);

      /* set bit should be done by wakeup irq routine if may wakeup */
      if (!device_may_wakeup(&(pdev->dev)))
            set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
      else
            while (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags))
                  msleep(1);

      pdev->dev.power.power_state = PMSG_ON;

      tmp = ehci_readl(ehci, &ehci->regs->command);
      tmp |= CMD_RUN;
      ehci_writel(ehci, tmp, &ehci->regs->command);

      usb_hcd_resume_root_hub(hcd);

      printk(KERN_INFO "USB Host resumed\n");

      if (device_may_wakeup(&(pdev->dev))) {
            if (pdata->usb_clock_for_pm)
                  pdata->usb_clock_for_pm(false);
      }

      return 0;
}
#endif                        /* CONFIG_USB_OTG */

MODULE_ALIAS("platform:fsl-ehci");

static struct platform_driver ehci_fsl_driver = {
      .probe = ehci_fsl_drv_probe,
      .remove = ehci_fsl_drv_remove,
      .shutdown = usb_hcd_platform_shutdown,
#ifdef CONFIG_PM
      .suspend = ehci_fsl_drv_suspend,
      .resume = ehci_fsl_drv_resume,
#endif
      .driver = {
               .name = "fsl-ehci",
      },
};

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