// SPDX-License-Identifier: GPL-2.0
/*
 * host.c - DesignWare USB3 DRD Controller Host Glue
 *
 * Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com
 *
 * Authors: Felipe Balbi <balbi@ti.com>,
 */

#include <linux/irq.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>

#include "../host/xhci-port.h"
#include "../host/xhci-ext-caps.h"
#include "../host/xhci-caps.h"
#include "../host/xhci-plat.h"
#include "core.h"

#define XHCI_HCSPARAMS1         0x4
#define XHCI_PORTSC_BASE        0x400

/**
 * dwc3_power_off_all_roothub_ports - Power off all Root hub ports
 * @dwc: Pointer to our controller context structure
 */
static void dwc3_power_off_all_roothub_ports(struct dwc3 *dwc)
{
        void __iomem *xhci_regs;
        u32 op_regs_base;
        int port_num;
        u32 offset;
        u32 reg;
        int i;

        /* xhci regs are not mapped yet, do it temporarily here */
        if (dwc->xhci_resources[0].start) {
                if (dwc->xhci_resources[0].flags & IORESOURCE_MEM_NONPOSTED)
                        xhci_regs = ioremap_np(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END);
                else
                        xhci_regs = ioremap(dwc->xhci_resources[0].start, DWC3_XHCI_REGS_END);
                if (!xhci_regs) {
                        dev_err(dwc->dev, "Failed to ioremap xhci_regs\n");
                        return;
                }

                op_regs_base = HC_LENGTH(readl(xhci_regs));
                reg = readl(xhci_regs + XHCI_HCSPARAMS1);
                port_num = HCS_MAX_PORTS(reg);

                for (i = 1; i <= port_num; i++) {
                        offset = op_regs_base + XHCI_PORTSC_BASE + 0x10 * (i - 1);
                        reg = readl(xhci_regs + offset);
                        reg &= ~PORT_POWER;
                        writel(reg, xhci_regs + offset);
                }

                iounmap(xhci_regs);
        } else {
                dev_err(dwc->dev, "xhci base reg invalid\n");
        }
}

static void dwc3_xhci_plat_start(struct usb_hcd *hcd)
{
        struct platform_device *pdev;
        struct dwc3 *dwc;

        if (!usb_hcd_is_primary_hcd(hcd))
                return;

        pdev = to_platform_device(hcd->self.controller);
        dwc = dev_get_drvdata(pdev->dev.parent);

        dwc3_enable_susphy(dwc, true);
}

static const struct xhci_plat_priv dwc3_xhci_plat_quirk = {
        .plat_start = dwc3_xhci_plat_start,
};

static void dwc3_host_fill_xhci_irq_res(struct dwc3 *dwc,
                                        int irq, char *name)
{
        struct platform_device *pdev = to_platform_device(dwc->dev);
        struct device_node *np = dev_of_node(&pdev->dev);

        dwc->xhci_resources[1].start = irq;
        dwc->xhci_resources[1].end = irq;
        dwc->xhci_resources[1].flags = IORESOURCE_IRQ | irq_get_trigger_type(irq);
        if (!name && np)
                dwc->xhci_resources[1].name = of_node_full_name(pdev->dev.of_node);
        else
                dwc->xhci_resources[1].name = name;
}

static int dwc3_host_get_irq(struct dwc3 *dwc)
{
        struct platform_device  *dwc3_pdev = to_platform_device(dwc->dev);
        int irq;

        irq = platform_get_irq_byname_optional(dwc3_pdev, "host");
        if (irq > 0) {
                dwc3_host_fill_xhci_irq_res(dwc, irq, "host");
                goto out;
        }

        if (irq == -EPROBE_DEFER)
                goto out;

        irq = platform_get_irq_byname_optional(dwc3_pdev, "dwc_usb3");
        if (irq > 0) {
                dwc3_host_fill_xhci_irq_res(dwc, irq, "dwc_usb3");
                goto out;
        }

        if (irq == -EPROBE_DEFER)
                goto out;

        irq = platform_get_irq(dwc3_pdev, 0);
        if (irq > 0)
                dwc3_host_fill_xhci_irq_res(dwc, irq, NULL);

out:
        return irq;
}

int dwc3_host_init(struct dwc3 *dwc)
{
        struct property_entry   props[6];
        struct platform_device  *xhci;
        int                     ret, irq;
        int                     prop_idx = 0;

        /*
         * Some platforms need to power off all Root hub ports immediately after DWC3 set to host
         * mode to avoid VBUS glitch happen when xhci get reset later.
         */
        dwc3_power_off_all_roothub_ports(dwc);

        irq = dwc3_host_get_irq(dwc);
        if (irq < 0)
                return irq;

        xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
        if (!xhci) {
                dev_err(dwc->dev, "couldn't allocate xHCI device\n");
                return -ENOMEM;
        }

        xhci->dev.parent        = dwc->dev;

        dwc->xhci = xhci;

        ret = platform_device_add_resources(xhci, dwc->xhci_resources,
                                                DWC3_XHCI_RESOURCES_NUM);
        if (ret) {
                dev_err(dwc->dev, "couldn't add resources to xHCI device\n");
                goto err;
        }

        memset(props, 0, sizeof(struct property_entry) * ARRAY_SIZE(props));

        props[prop_idx++] = PROPERTY_ENTRY_BOOL("xhci-sg-trb-cache-size-quirk");

        props[prop_idx++] = PROPERTY_ENTRY_BOOL("write-64-hi-lo-quirk");

        if (dwc->usb3_lpm_capable)
                props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb3-lpm-capable");

        if (dwc->usb2_lpm_disable)
                props[prop_idx++] = PROPERTY_ENTRY_BOOL("usb2-lpm-disable");

        /**
         * WORKAROUND: dwc3 revisions <=3.00a have a limitation
         * where Port Disable command doesn't work.
         *
         * The suggested workaround is that we avoid Port Disable
         * completely.
         *
         * This following flag tells XHCI to do just that.
         */
        if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))
                props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");

        props[prop_idx++] = PROPERTY_ENTRY_U16("num-hc-interrupters",
                                               dwc->num_hc_interrupters);

        if (prop_idx) {
                ret = device_create_managed_software_node(&xhci->dev, props, NULL);
                if (ret) {
                        dev_err(dwc->dev, "failed to add properties to xHCI\n");
                        goto err;
                }
        }

        ret = platform_device_add_data(xhci, &dwc3_xhci_plat_quirk,
                                       sizeof(struct xhci_plat_priv));
        if (ret)
                goto err;

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

        if (dwc->sys_wakeup) {
                /* Restore wakeup setting if switched from device */
                device_wakeup_enable(dwc->sysdev);

                /* Pass on wakeup setting to the new xhci platform device */
                device_init_wakeup(&xhci->dev, true);
        }

        return 0;
err:
        platform_device_put(xhci);
        return ret;
}
EXPORT_SYMBOL_GPL(dwc3_host_init);

void dwc3_host_exit(struct dwc3 *dwc)
{
        if (dwc->sys_wakeup)
                device_init_wakeup(&dwc->xhci->dev, false);

        dwc3_enable_susphy(dwc, true);
        platform_device_unregister(dwc->xhci);
        dwc->xhci = NULL;
}
EXPORT_SYMBOL_GPL(dwc3_host_exit);