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 #include "host-export.h"
  16 #include <linux/usb/hcd.h>
  17
  18 static int __cdns3_host_init(struct cdns3 *cdns)
  19 {
  20         struct platform_device *xhci;
  21         int ret;
  22         struct usb_hcd *hcd;
  23
  24         cdns3_drd_host_on(cdns);
  25
  26         xhci = platform_device_alloc("xhci-hcd", PLATFORM_DEVID_AUTO);
  27         if (!xhci) {
  28                 dev_err(cdns->dev, "couldn't allocate xHCI device\n");
  29                 return -ENOMEM;
  30         }
  31
  32         xhci->dev.parent = cdns->dev;
  33         cdns->host_dev = xhci;
  34
  35         ret = platform_device_add_resources(xhci, cdns->xhci_res,
  36                                             CDNS3_XHCI_RESOURCES_NUM);
  37         if (ret) {
  38                 dev_err(cdns->dev, "couldn't add resources to xHCI device\n");
  39                 goto err1;
  40         }
  41
  42         ret = platform_device_add(xhci);
  43         if (ret) {
  44                 dev_err(cdns->dev, "failed to register xHCI device\n");
  45                 goto err1;
  46         }
  47
  48         /* Glue needs to access xHCI region register for Power management */
  49         hcd = platform_get_drvdata(xhci);
  50         if (hcd)
  51                 cdns->xhci_regs = hcd->regs;
  52
  53         return 0;
  54 err1:
  55         platform_device_put(xhci);
  56         return ret;
  57 }
  58
  59 static void cdns3_host_exit(struct cdns3 *cdns)
  60 {
  61         platform_device_unregister(cdns->host_dev);
  62         cdns->host_dev = NULL;
  63         cdns3_drd_host_off(cdns);
  64 }
  65
  66 int cdns3_host_init(struct cdns3 *cdns)
  67 {
  68         struct cdns3_role_driver *rdrv;
  69
  70         rdrv = devm_kzalloc(cdns->dev, sizeof(*rdrv), GFP_KERNEL);
  71         if (!rdrv)
  72                 return -ENOMEM;
  73
  74         rdrv->start     = __cdns3_host_init;
  75         rdrv->stop      = cdns3_host_exit;
  76         rdrv->state     = CDNS3_ROLE_STATE_INACTIVE;
  77         rdrv->name      = "host";
  78
  79         cdns->roles[USB_ROLE_HOST] = rdrv;
  80
  81         return 0;
  82 }