/*
 * (C) Copyright David Brownell 2000-2002
 *
 * 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/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/usb.h>

#include <asm/io.h>
#include <asm/irq.h>

#ifdef CONFIG_PPC_PMAC
#include <asm/machdep.h>
#include <asm/pmac_feature.h>
#include <asm/pci-bridge.h>
#include <asm/prom.h>
#endif

#include "usb.h"
#include "hcd.h"


/* PCI-based HCs are common, but plenty of non-PCI HCs are used too */


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

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

/**
 * usb_hcd_pci_probe - initialize PCI-based HCDs
 * @dev: USB Host Controller being probed
 * @id: pci hotplug id connecting controller to HCD framework
 * Context: !in_interrupt()
 *
 * Allocates basic PCI resources for this USB host controller, and
 * then invokes the start() method for the HCD associated with it
 * through the hotplug entry's driver_data.
 *
 * Store this function in the HCD's struct pci_driver as probe().
 */
int usb_hcd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
        struct hc_driver        *driver;
        struct usb_hcd          *hcd;
        int                     retval;

        if (usb_disabled())
                return -ENODEV;

        if (!id)
                return -EINVAL;
        driver = (struct hc_driver *)id->driver_data;
        if (!driver)
                return -EINVAL;

        if (pci_enable_device(dev) < 0)
                return -ENODEV;
        dev->current_state = PCI_D0;

        if (!dev->irq) {
                dev_err(&dev->dev,
                        "Found HC with no IRQ.  Check BIOS/PCI %s setup!\n",
                        pci_name(dev));
                retval = -ENODEV;
                goto err1;
        }

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

        if (driver->flags & HCD_MEMORY) {
                /* EHCI, OHCI */
                hcd->rsrc_start = pci_resource_start(dev, 0);
                hcd->rsrc_len = pci_resource_len(dev, 0);
                if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
                                driver->description)) {
                        dev_dbg(&dev->dev, "controller already in use\n");
                        retval = -EBUSY;
                        goto err2;
                }
                hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
                if (hcd->regs == NULL) {
                        dev_dbg(&dev->dev, "error mapping memory\n");
                        retval = -EFAULT;
                        goto err3;
                }

        } else {
                /* UHCI */
                int     region;

                for (region = 0; region < PCI_ROM_RESOURCE; region++) {
                        if (!(pci_resource_flags(dev, region) &
                                        IORESOURCE_IO))
                                continue;

                        hcd->rsrc_start = pci_resource_start(dev, region);
                        hcd->rsrc_len = pci_resource_len(dev, region);
                        if (request_region(hcd->rsrc_start, hcd->rsrc_len,
                                        driver->description))
                                break;
                }
                if (region == PCI_ROM_RESOURCE) {
                        dev_dbg(&dev->dev, "no i/o regions available\n");
                        retval = -EBUSY;
                        goto err1;
                }
        }

        pci_set_master(dev);

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

 err4:
        if (driver->flags & HCD_MEMORY) {
                iounmap(hcd->regs);
 err3:
                release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
        } else
                release_region(hcd->rsrc_start, hcd->rsrc_len);
 err2:
        usb_put_hcd(hcd);
 err1:
        pci_disable_device(dev);
        dev_err(&dev->dev, "init %s fail, %d\n", pci_name(dev), retval);
        return retval;
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_probe);


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

/**
 * usb_hcd_pci_remove - shutdown processing for PCI-based HCDs
 * @dev: USB Host Controller being removed
 * Context: !in_interrupt()
 *
 * Reverses the effect of usb_hcd_pci_probe(), first invoking
 * the HCD's stop() method.  It is always called from a thread
 * context, normally "rmmod", "apmd", or something similar.
 *
 * Store this function in the HCD's struct pci_driver as remove().
 */
void usb_hcd_pci_remove(struct pci_dev *dev)
{
        struct usb_hcd          *hcd;

        hcd = pci_get_drvdata(dev);
        if (!hcd)
                return;

        usb_remove_hcd(hcd);
        if (hcd->driver->flags & HCD_MEMORY) {
                iounmap(hcd->regs);
                release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
        } else {
                release_region(hcd->rsrc_start, hcd->rsrc_len);
        }
        usb_put_hcd(hcd);
        pci_disable_device(dev);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_remove);

/**
 * usb_hcd_pci_shutdown - shutdown host controller
 * @dev: USB Host Controller being shutdown
 */
void usb_hcd_pci_shutdown(struct pci_dev *dev)
{
        struct usb_hcd          *hcd;

        hcd = pci_get_drvdata(dev);
        if (!hcd)
                return;

        if (hcd->driver->shutdown)
                hcd->driver->shutdown(hcd);
}
EXPORT_SYMBOL_GPL(usb_hcd_pci_shutdown);

#ifdef  CONFIG_PM_SLEEP

static int check_root_hub_suspended(struct device *dev)
{
        struct pci_dev          *pci_dev = to_pci_dev(dev);
        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);

        if (!(hcd->state == HC_STATE_SUSPENDED ||
                        hcd->state == HC_STATE_HALT)) {
                dev_warn(dev, "Root hub is not suspended\n");
                return -EBUSY;
        }
        return 0;
}

static int hcd_pci_suspend(struct device *dev)
{
        struct pci_dev          *pci_dev = to_pci_dev(dev);
        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
        int                     retval;

        /* Root hub suspend should have stopped all downstream traffic,
         * and all bus master traffic.  And done so for both the interface
         * and the stub usb_device (which we check here).  But maybe it
         * didn't; writing sysfs power/state files ignores such rules...
         */
        retval = check_root_hub_suspended(dev);
        if (retval)
                return retval;

        /* We might already be suspended (runtime PM -- not yet written) */
        if (pci_dev->current_state != PCI_D0)
                return retval;

        if (hcd->driver->pci_suspend) {
                retval = hcd->driver->pci_suspend(hcd);
                suspend_report_result(hcd->driver->pci_suspend, retval);
                if (retval)
                        return retval;
        }

        synchronize_irq(pci_dev->irq);

        /* Downstream ports from this root hub should already be quiesced, so
         * there will be no DMA activity.  Now we can shut down the upstream
         * link (except maybe for PME# resume signaling).  We'll enter a
         * low power state during suspend_noirq, if the hardware allows.
         */
        pci_disable_device(pci_dev);
        return retval;
}

static int hcd_pci_suspend_noirq(struct device *dev)
{
        struct pci_dev          *pci_dev = to_pci_dev(dev);
        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
        int                     retval;

        retval = check_root_hub_suspended(dev);
        if (retval)
                return retval;

        pci_save_state(pci_dev);

        /* If the root hub is HALTed rather than SUSPENDed,
         * disallow remote wakeup.
         */
        if (hcd->state == HC_STATE_HALT)
                device_set_wakeup_enable(dev, 0);
        dev_dbg(dev, "wakeup: %d\n", device_may_wakeup(dev));

        /* Possibly enable remote wakeup,
         * choose the appropriate low-power state, and go to that state.
         */
        retval = pci_prepare_to_sleep(pci_dev);
        if (retval == -EIO) {           /* Low-power not supported */
                dev_dbg(dev, "--> PCI D0 legacy\n");
                retval = 0;
        } else if (retval == 0) {
                dev_dbg(dev, "--> PCI %s\n",
                                pci_power_name(pci_dev->current_state));
        } else {
                suspend_report_result(pci_prepare_to_sleep, retval);
                return retval;
        }

#ifdef CONFIG_PPC_PMAC
        /* Disable ASIC clocks for USB */
        if (machine_is(powermac)) {
                struct device_node      *of_node;

                of_node = pci_device_to_OF_node(pci_dev);
                if (of_node)
                        pmac_call_feature(PMAC_FTR_USB_ENABLE, of_node, 0, 0);
        }
#endif
        return retval;
}

static int hcd_pci_resume_noirq(struct device *dev)
{
        struct pci_dev          *pci_dev = to_pci_dev(dev);

#ifdef CONFIG_PPC_PMAC
        /* Reenable ASIC clocks for USB */
        if (machine_is(powermac)) {
                struct device_node *of_node;

                of_node = pci_device_to_OF_node(pci_dev);
                if (of_node)
                        pmac_call_feature(PMAC_FTR_USB_ENABLE,
                                                of_node, 0, 1);
        }
#endif

        /* Go back to D0 and disable remote wakeup */
        pci_back_from_sleep(pci_dev);
        return 0;
}

static int resume_common(struct device *dev, bool hibernated)
{
        struct pci_dev          *pci_dev = to_pci_dev(dev);
        struct usb_hcd          *hcd = pci_get_drvdata(pci_dev);
        int                     retval;

        if (hcd->state != HC_STATE_SUSPENDED) {
                dev_dbg(dev, "can't resume, not suspended!\n");
                return 0;
        }

        retval = pci_enable_device(pci_dev);
        if (retval < 0) {
                dev_err(dev, "can't re-enable after resume, %d!\n", retval);
                return retval;
        }

        pci_set_master(pci_dev);

        clear_bit(HCD_FLAG_SAW_IRQ, &hcd->flags);

        if (hcd->driver->pci_resume) {
                retval = hcd->driver->pci_resume(hcd, hibernated);
                if (retval) {
                        dev_err(dev, "PCI post-resume error %d!\n", retval);
                        usb_hc_died(hcd);
                }
        }
        return retval;
}

static int hcd_pci_resume(struct device *dev)
{
        return resume_common(dev, false);
}

static int hcd_pci_restore(struct device *dev)
{
        return resume_common(dev, true);
}

struct dev_pm_ops usb_hcd_pci_pm_ops = {
        .suspend        = hcd_pci_suspend,
        .suspend_noirq  = hcd_pci_suspend_noirq,
        .resume_noirq   = hcd_pci_resume_noirq,
        .resume         = hcd_pci_resume,
        .freeze         = check_root_hub_suspended,
        .freeze_noirq   = check_root_hub_suspended,
        .thaw_noirq     = NULL,
        .thaw           = NULL,
        .poweroff       = hcd_pci_suspend,
        .poweroff_noirq = hcd_pci_suspend_noirq,
        .restore_noirq  = hcd_pci_resume_noirq,
        .restore        = hcd_pci_restore,
};
EXPORT_SYMBOL_GPL(usb_hcd_pci_pm_ops);

#endif  /* CONFIG_PM_SLEEP */