Quelle  host.c   Sprache: C

// 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;
}