drivers/usb/cdns3/host.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Cadence USBSS DRD Driver - host side
   4  *
   5  * Copyright (C) 2018-2019 Cadence Design Systems.
   6  * Copyright (C) 2017-2018 NXP
   7  *
   8  * Authors: Peter Chen <[email protected]>
   9  *          Pawel Laszczak <[email protected]>
  10  */
  11
  12 #include <linux/platform_device.h>
  13 #include "core.h"
  14 #include "drd.h"
  15
  16 static int __cdns3_host_init(struct cdns3 *cdns)
  17 {
  18         struct platform_device *xhci;
  19         int ret;
  20
  21         cdns3_drd_switch_host(cdns, 1);
  22
  23         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  24         if (!xhci) {
  25                 dev_err(cdns->dev, "couldn't allocate xHCI device\n");
  26                 return -ENOMEM;
  27         }
  28
  29         xhci->dev.parent = cdns->dev;
  30         cdns->host_dev = xhci;
  31
  32         ret = platform_device_add_resources(xhci, cdns->xhci_res,
  33                                             CDNS3_XHCI_RESOURCES_NUM);
  34         if (ret) {
  35                 dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
  36                 goto err1;
  37         }
  38
  39         ret = platform_device_add(xhci);
  40         if (ret) {
  41                 dev_err(cdns->dev, "failed to register xHCI device\n");
  42                 goto err1;
  43         }
  44
  45         return 0;
  46 err1:
  47         platform_device_put(xhci);
  48         return ret;
  49 }
  50
  51 static void cdns3_host_exit(struct cdns3 *cdns)
  52 {
  53         platform_device_unregister(cdns->host_dev);
  54         cdns->host_dev = NULL;
  55         cdns3_drd_switch_host(cdns, 0);
  56 }
  57
  58 int cdns3_host_init(struct cdns3 *cdns)
  59 {
  60         struct cdns3_role_driver *rdrv;
  61
  62         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
  63         if (!rdrv)
  64                 return -ENOMEM;
  65
  66         rdrv->start     = __cdns3_host_init;
  67         rdrv->stop      = cdns3_host_exit;
  68         rdrv->state     = CDNS3_ROLE_STATE_INACTIVE;
  69         rdrv->name      = "host";
  70
  71         cdns->roles[USB_ROLE_HOST] = rdrv;
  72
  73         return 0;
  74 }