drivers/usb/host/ehci-generic.c

   1 /*
   2  * Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <asm/io.h>
  10 #include <dm.h>
  11 #include "ehci.h"
  12
  13 /*
  14  * Even though here we don't explicitly use "struct ehci_ctrl"
  15  * ehci_register() expects it to be the first thing that resides in
  16  * device's private data.
  17  */
  18 struct generic_ehci {
  19         struct ehci_ctrl ctrl;
  20 };
  21
  22 static int ehci_usb_probe(struct udevice *dev)
  23 {
  24         struct ehci_hccr *hccr;
  25         struct ehci_hcor *hcor;
  26         int i;
  27
  28         for (i = 0; ; i++) {
  29                 struct clk clk;
  30                 int ret;
  31
  32                 ret = clk_get_by_index(dev, i, &clk);
  33                 if (ret < 0)
  34                         break;
  35                 if (clk_enable(&clk))
  36                         printf("failed to enable clock %d\n", i);
  37                 clk_free(&clk);
  38         }
  39
  40         hccr = map_physmem(dev_get_addr(dev), 0x100, MAP_NOCACHE);
  41         hcor = (struct ehci_hcor *)((uintptr_t)hccr +
  42                                     HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
  43
  44         return ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST);
  45 }
  46
  47 static const struct udevice_id ehci_usb_ids[] = {
  48         { .compatible = "generic-ehci" },
  49         { }
  50 };
  51
  52 U_BOOT_DRIVER(ehci_generic) = {
  53         .name   = "ehci_generic",
  54         .id     = UCLASS_USB,
  55         .of_match = ehci_usb_ids,
  56         .probe = ehci_usb_probe,
  57         .remove = ehci_deregister,
  58         .ops    = &ehci_usb_ops,
  59         .priv_auto_alloc_size = sizeof(struct generic_ehci),
  60         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
  61 };