/*
 * xHCI host controller driver PCI Bus Glue.
 *
 * Copyright (C) 2008 Intel Corp.
 *
 * Author: Sarah Sharp
 * Some code borrowed from the Linux EHCI driver.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * 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/pci.h>
#include <linux/slab.h>
#include <linux/module.h>

#include "xhci.h"

/* Device for a quirk */
#define PCI_VENDOR_ID_FRESCO_LOGIC      0x1b73
#define PCI_DEVICE_ID_FRESCO_LOGIC_PDK  0x1000

#define PCI_VENDOR_ID_ETRON             0x1b6f
#define PCI_DEVICE_ID_ASROCK_P67        0x7023

static const char hcd_name[] = "xhci_hcd";

/* called after powerup, by probe or system-pm "wakeup" */
static int xhci_pci_reinit(struct xhci_hcd *xhci, struct pci_dev *pdev)
{
        /*
         * TODO: Implement finding debug ports later.
         * TODO: see if there are any quirks that need to be added to handle
         * new extended capabilities.
         */

        /* PCI Memory-Write-Invalidate cycle support is optional (uncommon) */
        if (!pci_set_mwi(pdev))
                xhci_dbg(xhci, "MWI active\n");

        xhci_dbg(xhci, "Finished xhci_pci_reinit\n");
        return 0;
}

static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
{
        struct pci_dev          *pdev = to_pci_dev(dev);

        /* Look for vendor-specific quirks */
        if (pdev->vendor == PCI_VENDOR_ID_FRESCO_LOGIC &&
                        pdev->device == PCI_DEVICE_ID_FRESCO_LOGIC_PDK) {
                if (pdev->revision == 0x0) {
                        xhci->quirks |= XHCI_RESET_EP_QUIRK;
                        xhci_dbg(xhci, "QUIRK: Fresco Logic xHC needs configure"
                                        " endpoint cmd after reset endpoint\n");
                }
                /* Fresco Logic confirms: all revisions of this chip do not
                 * support MSI, even though some of them claim to in their PCI
                 * capabilities.
                 */
                xhci->quirks |= XHCI_BROKEN_MSI;
                xhci_dbg(xhci, "QUIRK: Fresco Logic revision %u "
                                "has broken MSI implementation\n",
                                pdev->revision);
                xhci->quirks |= XHCI_TRUST_TX_LENGTH;
        }

        if (pdev->vendor == PCI_VENDOR_ID_NEC)
                xhci->quirks |= XHCI_NEC_HOST;

        if (pdev->vendor == PCI_VENDOR_ID_AMD && xhci->hci_version == 0x96)
                xhci->quirks |= XHCI_AMD_0x96_HOST;

        /* AMD PLL quirk */
        if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
                xhci->quirks |= XHCI_AMD_PLL_FIX;
        if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
                xhci->quirks |= XHCI_LPM_SUPPORT;
                xhci->quirks |= XHCI_INTEL_HOST;
        }
        if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
                        pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
                xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
                xhci->quirks |= XHCI_EP_LIMIT_QUIRK;
                xhci->limit_active_eps = 64;
                xhci->quirks |= XHCI_SW_BW_CHECKING;
        }
        if (pdev->vendor == PCI_VENDOR_ID_ETRON &&
                        pdev->device == PCI_DEVICE_ID_ASROCK_P67) {
                xhci->quirks |= XHCI_RESET_ON_RESUME;
                xhci_dbg(xhci, "QUIRK: Resetting on resume\n");
        }
        if (pdev->vendor == PCI_VENDOR_ID_VIA)
                xhci->quirks |= XHCI_RESET_ON_RESUME;
}

/* called during probe() after chip reset completes */
static int xhci_pci_setup(struct usb_hcd *hcd)
{
        struct xhci_hcd         *xhci;
        struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
        int                     retval;

        retval = xhci_gen_setup(hcd, xhci_pci_quirks);
        if (retval)
                return retval;

        xhci = hcd_to_xhci(hcd);
        if (!usb_hcd_is_primary_hcd(hcd))
                return 0;

        pci_read_config_byte(pdev, XHCI_SBRN_OFFSET, &xhci->sbrn);
        xhci_dbg(xhci, "Got SBRN %u\n", (unsigned int) xhci->sbrn);

        /* Find any debug ports */
        retval = xhci_pci_reinit(xhci, pdev);
        if (!retval)
                return retval;

        kfree(xhci);
        return retval;
}

/*
 * We need to register our own PCI probe function (instead of the USB core's
 * function) in order to create a second roothub under xHCI.
 */
static int xhci_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
        int retval;
        struct xhci_hcd *xhci;
        struct hc_driver *driver;
        struct usb_hcd *hcd;

        driver = (struct hc_driver *)id->driver_data;
        /* Register the USB 2.0 roothub.
         * FIXME: USB core must know to register the USB 2.0 roothub first.
         * This is sort of silly, because we could just set the HCD driver flags
         * to say USB 2.0, but I'm not sure what the implications would be in
         * the other parts of the HCD code.
         */
        retval = usb_hcd_pci_probe(dev, id);

        if (retval)
                return retval;

        /* USB 2.0 roothub is stored in the PCI device now. */
        hcd = dev_get_drvdata(&dev->dev);
        xhci = hcd_to_xhci(hcd);
        xhci->shared_hcd = usb_create_shared_hcd(driver, &dev->dev,
                                pci_name(dev), hcd);
        if (!xhci->shared_hcd) {
                retval = -ENOMEM;
                goto dealloc_usb2_hcd;
        }

        /* Set the xHCI pointer before xhci_pci_setup() (aka hcd_driver.reset)
         * is called by usb_add_hcd().
         */
        *((struct xhci_hcd **) xhci->shared_hcd->hcd_priv) = xhci;

        retval = usb_add_hcd(xhci->shared_hcd, dev->irq,
                        IRQF_SHARED);
        if (retval)
                goto put_usb3_hcd;
        /* Roothub already marked as USB 3.0 speed */

        /* We know the LPM timeout algorithms for this host, let the USB core
         * enable and disable LPM for devices under the USB 3.0 roothub.
         */
        if (xhci->quirks & XHCI_LPM_SUPPORT)
                hcd_to_bus(xhci->shared_hcd)->root_hub->lpm_capable = 1;

        return 0;

put_usb3_hcd:
        usb_put_hcd(xhci->shared_hcd);
dealloc_usb2_hcd:
        usb_hcd_pci_remove(dev);
        return retval;
}

static void xhci_pci_remove(struct pci_dev *dev)
{
        struct xhci_hcd *xhci;

        xhci = hcd_to_xhci(pci_get_drvdata(dev));
        if (xhci->shared_hcd) {
                usb_remove_hcd(xhci->shared_hcd);
                usb_put_hcd(xhci->shared_hcd);
        }
        usb_hcd_pci_remove(dev);
        kfree(xhci);
}

#ifdef CONFIG_PM
static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
{
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
        int     retval = 0;

        if (hcd->state != HC_STATE_SUSPENDED ||
                        xhci->shared_hcd->state != HC_STATE_SUSPENDED)
                return -EINVAL;

        retval = xhci_suspend(xhci);

        return retval;
}

static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
{
        struct xhci_hcd         *xhci = hcd_to_xhci(hcd);
        struct pci_dev          *pdev = to_pci_dev(hcd->self.controller);
        int                     retval = 0;

        /* The BIOS on systems with the Intel Panther Point chipset may or may
         * not support xHCI natively.  That means that during system resume, it
         * may switch the ports back to EHCI so that users can use their
         * keyboard to select a kernel from GRUB after resume from hibernate.
         *
         * The BIOS is supposed to remember whether the OS had xHCI ports
         * enabled before resume, and switch the ports back to xHCI when the
         * BIOS/OS semaphore is written, but we all know we can't trust BIOS
         * writers.
         *
         * Unconditionally switch the ports back to xHCI after a system resume.
         * We can't tell whether the EHCI or xHCI controller will be resumed
         * first, so we have to do the port switchover in both drivers.  Writing
         * a '1' to the port switchover registers should have no effect if the
         * port was already switched over.
         */
        if (usb_is_intel_switchable_xhci(pdev))
                usb_enable_xhci_ports(pdev);

        retval = xhci_resume(xhci, hibernated);
        return retval;
}
#endif /* CONFIG_PM */

static const struct hc_driver xhci_pci_hc_driver = {
        .description =          hcd_name,
        .product_desc =         "xHCI Host Controller",
        .hcd_priv_size =        sizeof(struct xhci_hcd *),

        /*
         * generic hardware linkage
         */
        .irq =                  xhci_irq,
        .flags =                HCD_MEMORY | HCD_USB3 | HCD_SHARED,

        /*
         * basic lifecycle operations
         */
        .reset =                xhci_pci_setup,
        .start =                xhci_run,
#ifdef CONFIG_PM
        .pci_suspend =          xhci_pci_suspend,
        .pci_resume =           xhci_pci_resume,
#endif
        .stop =                 xhci_stop,
        .shutdown =             xhci_shutdown,

        /*
         * managing i/o requests and associated device resources
         */
        .urb_enqueue =          xhci_urb_enqueue,
        .urb_dequeue =          xhci_urb_dequeue,
        .alloc_dev =            xhci_alloc_dev,
        .free_dev =             xhci_free_dev,
        .alloc_streams =        xhci_alloc_streams,
        .free_streams =         xhci_free_streams,
        .add_endpoint =         xhci_add_endpoint,
        .drop_endpoint =        xhci_drop_endpoint,
        .endpoint_reset =       xhci_endpoint_reset,
        .check_bandwidth =      xhci_check_bandwidth,
        .reset_bandwidth =      xhci_reset_bandwidth,
        .address_device =       xhci_address_device,
        .update_hub_device =    xhci_update_hub_device,
        .reset_device =         xhci_discover_or_reset_device,

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

        /* Root hub support */
        .hub_control =          xhci_hub_control,
        .hub_status_data =      xhci_hub_status_data,
        .bus_suspend =          xhci_bus_suspend,
        .bus_resume =           xhci_bus_resume,
        /*
         * call back when device connected and addressed
         */
        .update_device =        xhci_update_device,
        .set_usb2_hw_lpm =      xhci_set_usb2_hardware_lpm,
        .enable_usb3_lpm_timeout =      xhci_enable_usb3_lpm_timeout,
        .disable_usb3_lpm_timeout =     xhci_disable_usb3_lpm_timeout,
};

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

/* PCI driver selection metadata; PCI hotplugging uses this */
static const struct pci_device_id pci_ids[] = { {
        /* handle any USB 3.0 xHCI controller */
        PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0),
        .driver_data =  (unsigned long) &xhci_pci_hc_driver,
        },
        { /* end: all zeroes */ }
};
MODULE_DEVICE_TABLE(pci, pci_ids);

/* pci driver glue; this is a "new style" PCI driver module */
static struct pci_driver xhci_pci_driver = {
        .name =         (char *) hcd_name,
        .id_table =     pci_ids,

        .probe =        xhci_pci_probe,
        .remove =       xhci_pci_remove,
        /* suspend and resume implemented later */

        .shutdown =     usb_hcd_pci_shutdown,
#ifdef CONFIG_PM_SLEEP
        .driver = {
                .pm = &usb_hcd_pci_pm_ops
        },
#endif
};

int __init xhci_register_pci(void)
{
        return pci_register_driver(&xhci_pci_driver);
}

void xhci_unregister_pci(void)
{
        pci_unregister_driver(&xhci_pci_driver);
}