// SPDX-License-Identifier: GPL-2.0
/*
 * Cadence USBSS and USBSSP DRD Driver - host side
 *
 * Copyright (C) 2018-2019 Cadence Design Systems.
 * Copyright (C) 2017-2018 NXP
 *
 * Authors: Peter Chen <peter.chen@nxp.com>
 *          Pawel Laszczak <pawell@cadence.com>
 */

#include <linux/platform_device.h>
#include <linux/slab.h>
#include "core.h"
#include "drd.h"
#include "host-export.h"
#include <linux/usb/hcd.h>
#include "../host/xhci.h"
#include "../host/xhci-plat.h"

/*
 * The XECP_PORT_CAP_REG and XECP_AUX_CTRL_REG1 exist only
 * in Cadence USB3 dual-role controller, so it can't be used
 * with Cadence CDNSP dual-role controller.
 */
#define XECP_PORT_CAP_REG       0x8000
#define XECP_AUX_CTRL_REG1      0x8120

#define CFG_RXDET_P3_EN         BIT(15)
#define LPM_2_STB_SWITCH_EN     BIT(25)

static void xhci_cdns3_plat_start(struct usb_hcd *hcd)
{
        struct xhci_hcd *xhci = hcd_to_xhci(hcd);
        u32 value;

        /* set usbcmd.EU3S */
        value = readl(&xhci->op_regs->command);
        value |= CMD_PM_INDEX;
        writel(value, &xhci->op_regs->command);

        if (hcd->regs) {
                value = readl(hcd->regs + XECP_AUX_CTRL_REG1);
                value |= CFG_RXDET_P3_EN;
                writel(value, hcd->regs + XECP_AUX_CTRL_REG1);

                value = readl(hcd->regs + XECP_PORT_CAP_REG);
                value |= LPM_2_STB_SWITCH_EN;
                writel(value, hcd->regs + XECP_PORT_CAP_REG);
        }
}

static int xhci_cdns3_resume_quirk(struct usb_hcd *hcd)
{
        xhci_cdns3_plat_start(hcd);
        return 0;
}

static const struct xhci_plat_priv xhci_plat_cdns3_xhci = {
        .quirks = XHCI_SKIP_PHY_INIT | XHCI_AVOID_BEI,
        .plat_start = xhci_cdns3_plat_start,
        .resume_quirk = xhci_cdns3_resume_quirk,
};

static const struct xhci_plat_priv xhci_plat_cdnsp_xhci = {
        .quirks = XHCI_CDNS_SCTX_QUIRK,
};

static int __cdns_host_init(struct cdns *cdns)
{
        struct platform_device *xhci;
        int ret;
        struct usb_hcd *hcd;

        cdns_drd_host_on(cdns);

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

        xhci->dev.parent = cdns->dev;
        cdns->host_dev = xhci;

        ret = platform_device_add_resources(xhci, cdns->xhci_res,
                                            CDNS_XHCI_RESOURCES_NUM);
        if (ret) {
                dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
                goto err1;
        }

        if (cdns->version < CDNSP_CONTROLLER_V2)
                cdns->xhci_plat_data = kmemdup(&xhci_plat_cdns3_xhci,
                                sizeof(struct xhci_plat_priv), GFP_KERNEL);
        else
                cdns->xhci_plat_data = kmemdup(&xhci_plat_cdnsp_xhci,
                                sizeof(struct xhci_plat_priv), GFP_KERNEL);

        if (!cdns->xhci_plat_data) {
                ret = -ENOMEM;
                goto err1;
        }

        if (cdns->pdata && (cdns->pdata->quirks & CDNS3_DEFAULT_PM_RUNTIME_ALLOW))
                cdns->xhci_plat_data->quirks |= XHCI_DEFAULT_PM_RUNTIME_ALLOW;

        ret = platform_device_add_data(xhci, cdns->xhci_plat_data,
                        sizeof(struct xhci_plat_priv));
        if (ret)
                goto free_memory;

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

        /* Glue needs to access xHCI region register for Power management */
        hcd = platform_get_drvdata(xhci);
        if (hcd)
                cdns->xhci_regs = hcd->regs;

        return 0;

free_memory:
        kfree(cdns->xhci_plat_data);
err1:
        platform_device_put(xhci);
        return ret;
}

static void cdns_host_exit(struct cdns *cdns)
{
        kfree(cdns->xhci_plat_data);
        platform_device_unregister(cdns->host_dev);
        cdns->host_dev = NULL;
        cdns_drd_host_off(cdns);
}

static int cdns_host_resume(struct cdns *cdns, bool power_lost)
{
        struct usb_hcd *hcd = platform_get_drvdata(cdns->host_dev);
        struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);

        priv->power_lost = power_lost;

        return 0;
}

int cdns_host_init(struct cdns *cdns)
{
        struct cdns_role_driver *rdrv;

        rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
        if (!rdrv)
                return -ENOMEM;

        rdrv->start     = __cdns_host_init;
        rdrv->stop      = cdns_host_exit;
        rdrv->resume    = cdns_host_resume;
        rdrv->state     = CDNS_ROLE_STATE_INACTIVE;
        rdrv->name      = "host";

        cdns->roles[USB_ROLE_HOST] = rdrv;

        return 0;
}