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 <peter.chen@nxp.com>
   9  *          Pawel Laszczak <pawell@cadence.com>
  10  */
  11
  12 #include <linux/platform_device.h>
  13 #include "core.h"
  14 #include "drd.h"
  15 #include "host-export.h"
  16
  17 static int __cdns3_host_init(struct cdns3 *cdns)
  18 {
  19         struct platform_device *xhci;
  20         int ret;
  21
  22         cdns3_drd_switch_host(cdns, 1);
  23
  24         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  25         if (!xhci) {
  26                 dev_err(cdns->dev, "couldn't allocate xHCI device\n");
  27                 return -ENOMEM;
  28         }
  29
  30         xhci->dev.parent = cdns->dev;
  31         cdns->host_dev = xhci;
  32
  33         ret = platform_device_add_resources(xhci, cdns->xhci_res,
  34                                             CDNS3_XHCI_RESOURCES_NUM);
  35         if (ret) {
  36                 dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
  37                 goto err1;
  38         }
  39
  40         ret = platform_device_add(xhci);
  41         if (ret) {
  42                 dev_err(cdns->dev, "failed to register xHCI device\n");
  43                 goto err1;
  44         }
  45
  46         return 0;
  47 err1:
  48         platform_device_put(xhci);
  49         return ret;
  50 }
  51
  52 static void cdns3_host_exit(struct cdns3 *cdns)
  53 {
  54         platform_device_unregister(cdns->host_dev);
  55         cdns->host_dev = NULL;
  56         cdns3_drd_switch_host(cdns, 0);
  57 }
  58
  59 int cdns3_host_init(struct cdns3 *cdns)
  60 {
  61         struct cdns3_role_driver *rdrv;
  62
  63         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
  64         if (!rdrv)
  65                 return -ENOMEM;
  66
  67         rdrv->start     = __cdns3_host_init;
  68         rdrv->stop      = cdns3_host_exit;
  69         rdrv->state     = CDNS3_ROLE_STATE_INACTIVE;
  70         rdrv->name      = "host";
  71
  72         cdns->roles[USB_ROLE_HOST] = rdrv;
  73
  74         return 0;
  75 }