// SPDX-License-Identifier: GPL-2.0
/*
 * ci_hdrc_pci.c - MIPS USB IP core family device controller
 *
 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
 *
 * Author: David Lopo
 */

#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/usb/gadget.h>
#include <linux/usb/chipidea.h>
#include <linux/usb/usb_phy_generic.h>

/* driver name */
#define UDC_DRIVER_NAME   "ci_hdrc_pci"

struct ci_hdrc_pci {
        struct platform_device  *ci;
        struct platform_device  *phy;
};

/******************************************************************************
 * PCI block
 *****************************************************************************/
static struct ci_hdrc_platform_data pci_platdata = {
        .name           = UDC_DRIVER_NAME,
        .capoffset      = DEF_CAPOFFSET,
};

static struct ci_hdrc_platform_data langwell_pci_platdata = {
        .name           = UDC_DRIVER_NAME,
        .capoffset      = 0,
};

static struct ci_hdrc_platform_data penwell_pci_platdata = {
        .name           = UDC_DRIVER_NAME,
        .capoffset      = 0,
        .power_budget   = 200,
};

/**
 * ci_hdrc_pci_probe: PCI probe
 * @pdev: USB device controller being probed
 * @id:   PCI hotplug ID connecting controller to UDC framework
 *
 * This function returns an error code
 * Allocates basic PCI resources for this USB device controller, and then
 * invokes the udc_probe() method to start the UDC associated with it
 */
static int ci_hdrc_pci_probe(struct pci_dev *pdev,
                                       const struct pci_device_id *id)
{
        struct ci_hdrc_platform_data *platdata = (void *)id->driver_data;
        struct ci_hdrc_pci *ci;
        struct resource res[3];
        int retval = 0, nres = 2;

        if (!platdata) {
                dev_err(&pdev->dev, "device doesn't provide driver data\n");
                return -ENODEV;
        }

        ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
        if (!ci)
                return -ENOMEM;

        retval = pcim_enable_device(pdev);
        if (retval)
                return retval;

        if (!pdev->irq) {
                dev_err(&pdev->dev, "No IRQ, check BIOS/PCI setup!");
                return -ENODEV;
        }

        pci_set_master(pdev);
        pci_try_set_mwi(pdev);

        /* register a nop PHY */
        ci->phy = usb_phy_generic_register();
        if (IS_ERR(ci->phy))
                return PTR_ERR(ci->phy);

        memset(res, 0, sizeof(res));
        res[0].start    = pci_resource_start(pdev, 0);
        res[0].end      = pci_resource_end(pdev, 0);
        res[0].flags    = IORESOURCE_MEM;
        res[1].start    = pdev->irq;
        res[1].flags    = IORESOURCE_IRQ;

        ci->ci = ci_hdrc_add_device(&pdev->dev, res, nres, platdata);
        if (IS_ERR(ci->ci)) {
                dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
                usb_phy_generic_unregister(ci->phy);
                return PTR_ERR(ci->ci);
        }

        pci_set_drvdata(pdev, ci);

        return 0;
}

/**
 * ci_hdrc_pci_remove: PCI remove
 * @pdev: USB Device Controller being removed
 *
 * Reverses the effect of ci_hdrc_pci_probe(),
 * first invoking the udc_remove() and then releases
 * all PCI resources allocated for this USB device controller
 */
static void ci_hdrc_pci_remove(struct pci_dev *pdev)
{
        struct ci_hdrc_pci *ci = pci_get_drvdata(pdev);

        ci_hdrc_remove_device(ci->ci);
        usb_phy_generic_unregister(ci->phy);
}

/*
 * PCI device table
 * PCI device structure
 *
 * Check "pci.h" for details
 *
 * Note: ehci-pci driver may try to probe the device first. You have to add an
 * ID to the bypass_pci_id_table in ehci-pci driver to prevent this.
 */
static const struct pci_device_id ci_hdrc_pci_id_table[] = {
        {
                PCI_DEVICE(0x153F, 0x1004),
                .driver_data = (kernel_ulong_t)&pci_platdata,
        },
        {
                PCI_DEVICE(0x153F, 0x1006),
                .driver_data = (kernel_ulong_t)&pci_platdata,
        },
        {
                PCI_VDEVICE(INTEL, 0x0811),
                .driver_data = (kernel_ulong_t)&langwell_pci_platdata,
        },
        {
                PCI_VDEVICE(INTEL, 0x0829),
                .driver_data = (kernel_ulong_t)&penwell_pci_platdata,
        },
        {
                /* Intel Clovertrail */
                PCI_VDEVICE(INTEL, 0xe006),
                .driver_data = (kernel_ulong_t)&penwell_pci_platdata,
        },
        { 0 } /* end: all zeroes */
};
MODULE_DEVICE_TABLE(pci, ci_hdrc_pci_id_table);

static struct pci_driver ci_hdrc_pci_driver = {
        .name         = UDC_DRIVER_NAME,
        .id_table     = ci_hdrc_pci_id_table,
        .probe        = ci_hdrc_pci_probe,
        .remove       = ci_hdrc_pci_remove,
};

module_pci_driver(ci_hdrc_pci_driver);

MODULE_AUTHOR("MIPS - David Lopo <dlopo@chipidea.mips.com>");
MODULE_DESCRIPTION("MIPS CI13XXX USB Peripheral Controller");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:ci13xxx_pci");