// SPDX-License-Identifier: GPL-2.0
/*
 * dwc3-haps.c - Synopsys HAPS PCI Specific glue layer
 *
 * Copyright (C) 2018 Synopsys, Inc.
 *
 * Authors: Thinh Nguyen <thinhn@synopsys.com>,
 *          John Youn <johnyoun@synopsys.com>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/property.h>

/**
 * struct dwc3_haps - Driver private structure
 * @dwc3: child dwc3 platform_device
 * @pci: our link to PCI bus
 */
struct dwc3_haps {
        struct platform_device *dwc3;
        struct pci_dev *pci;
};

static const struct property_entry initial_properties[] = {
        PROPERTY_ENTRY_BOOL("snps,usb3_lpm_capable"),
        PROPERTY_ENTRY_BOOL("snps,has-lpm-erratum"),
        PROPERTY_ENTRY_BOOL("snps,dis_enblslpm_quirk"),
        PROPERTY_ENTRY_BOOL("linux,sysdev_is_parent"),
        { },
};

static const struct software_node dwc3_haps_swnode = {
        .properties = initial_properties,
};

static int dwc3_haps_probe(struct pci_dev *pci,
                           const struct pci_device_id *id)
{
        struct dwc3_haps        *dwc;
        struct device           *dev = &pci->dev;
        struct resource         res[2];
        int                     ret;

        ret = pcim_enable_device(pci);
        if (ret) {
                dev_err(dev, "failed to enable pci device\n");
                return -ENODEV;
        }

        pci_set_master(pci);

        dwc = devm_kzalloc(dev, sizeof(*dwc), GFP_KERNEL);
        if (!dwc)
                return -ENOMEM;

        dwc->dwc3 = platform_device_alloc("dwc3", PLATFORM_DEVID_AUTO);
        if (!dwc->dwc3)
                return -ENOMEM;

        memset(res, 0x00, sizeof(struct resource) * ARRAY_SIZE(res));

        res[0].start    = pci_resource_start(pci, 0);
        res[0].end      = pci_resource_end(pci, 0);
        res[0].name     = "dwc_usb3";
        res[0].flags    = IORESOURCE_MEM;

        res[1].start    = pci->irq;
        res[1].name     = "dwc_usb3";
        res[1].flags    = IORESOURCE_IRQ;

        ret = platform_device_add_resources(dwc->dwc3, res, ARRAY_SIZE(res));
        if (ret) {
                dev_err(dev, "couldn't add resources to dwc3 device\n");
                goto err;
        }

        dwc->pci = pci;
        dwc->dwc3->dev.parent = dev;

        ret = device_add_software_node(&dwc->dwc3->dev, &dwc3_haps_swnode);
        if (ret)
                goto err;

        ret = platform_device_add(dwc->dwc3);
        if (ret) {
                dev_err(dev, "failed to register dwc3 device\n");
                goto err;
        }

        pci_set_drvdata(pci, dwc);

        return 0;
err:
        device_remove_software_node(&dwc->dwc3->dev);
        platform_device_put(dwc->dwc3);
        return ret;
}

static void dwc3_haps_remove(struct pci_dev *pci)
{
        struct dwc3_haps *dwc = pci_get_drvdata(pci);

        device_remove_software_node(&dwc->dwc3->dev);
        platform_device_unregister(dwc->dwc3);
}

static const struct pci_device_id dwc3_haps_id_table[] = {
        {
                PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
                           PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3),
                /*
                 * i.MX6QP and i.MX7D platform use a PCIe controller with the
                 * same VID and PID as this USB controller. The system may
                 * incorrectly match this driver to that PCIe controller. To
                 * workaround this, specifically use class type USB to prevent
                 * incorrect driver matching.
                 */
                .class = (PCI_CLASS_SERIAL_USB << 8),
                .class_mask = 0xffff00,
        },
        {
                PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
                           PCI_DEVICE_ID_SYNOPSYS_HAPSUSB3_AXI),
        },
        {
                PCI_DEVICE(PCI_VENDOR_ID_SYNOPSYS,
                           PCI_DEVICE_ID_SYNOPSYS_HAPSUSB31),
        },
        {  }    /* Terminating Entry */
};
MODULE_DEVICE_TABLE(pci, dwc3_haps_id_table);

static struct pci_driver dwc3_haps_driver = {
        .name           = "dwc3-haps",
        .id_table       = dwc3_haps_id_table,
        .probe          = dwc3_haps_probe,
        .remove         = dwc3_haps_remove,
};

MODULE_AUTHOR("Thinh Nguyen <thinhn@synopsys.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Synopsys HAPS PCI Glue Layer");

module_pci_driver(dwc3_haps_driver);