git.sur5r.net Git - u-boot/blob - drivers/usb/host/ohci-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 <dm.h>
  10 #include <dm/ofnode.h>
  11 #include <reset.h>
  12 #include "ohci.h"
  13
  14 #if !defined(CONFIG_USB_OHCI_NEW)
  15 # error "Generic OHCI driver requires CONFIG_USB_OHCI_NEW"
  16 #endif
  17
  18 struct generic_ohci {
  19         ohci_t ohci;
  20         struct clk *clocks;     /* clock list */
  21         struct reset_ctl *resets; /* reset list */
  22         int clock_count;        /* number of clock in clock list */
  23         int reset_count;        /* number of reset in reset list */
  24 };
  25
  26 static int ohci_usb_probe(struct udevice *dev)
  27 {
  28         struct ohci_regs *regs = (struct ohci_regs *)devfdt_get_addr(dev);
  29         struct generic_ohci *priv = dev_get_priv(dev);
  30         int i, err, ret, clock_nb, reset_nb;
  31
  32         err = 0;
  33         priv->clock_count = 0;
  34         clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
  35         if (clock_nb > 0) {
  36                 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
  37                                             GFP_KERNEL);
  38                 if (!priv->clocks)
  39                         return -ENOMEM;
  40
  41                 for (i = 0; i < clock_nb; i++) {
  42                         err = clk_get_by_index(dev, i, &priv->clocks[i]);
  43                         if (err < 0)
  44                                 break;
  45
  46                         err = clk_enable(&priv->clocks[i]);
  47                         if (err) {
  48                                 error("failed to enable clock %d\n", i);
  49                                 clk_free(&priv->clocks[i]);
  50                                 goto clk_err;
  51                         }
  52                         priv->clock_count++;
  53                 }
  54         } else if (clock_nb != -ENOENT) {
  55                 error("failed to get clock phandle(%d)\n", clock_nb);
  56                 return clock_nb;
  57         }
  58
  59         priv->reset_count = 0;
  60         reset_nb = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
  61         if (reset_nb > 0) {
  62                 priv->resets = devm_kcalloc(dev, reset_nb,
  63                                             sizeof(struct reset_ctl),
  64                                             GFP_KERNEL);
  65                 if (!priv->resets)
  66                         return -ENOMEM;
  67
  68                 for (i = 0; i < reset_nb; i++) {
  69                         err = reset_get_by_index(dev, i, &priv->resets[i]);
  70                         if (err < 0)
  71                                 break;
  72
  73                         err = reset_deassert(&priv->resets[i]);
  74                         if (err) {
  75                                 error("failed to deassert reset %d\n", i);
  76                                 reset_free(&priv->resets[i]);
  77                                 goto reset_err;
  78                         }
  79                         priv->reset_count++;
  80                 }
  81         } else if (reset_nb != -ENOENT) {
  82                 error("failed to get reset phandle(%d)\n", reset_nb);
  83                 goto clk_err;
  84         }
  85
  86         err = ohci_register(dev, regs);
  87         if (err)
  88                 goto reset_err;
  89
  90         return 0;
  91
  92 reset_err:
  93         ret = reset_release_all(priv->resets, priv->reset_count);
  94         if (ret)
  95                 error("failed to assert all resets\n");
  96 clk_err:
  97         ret = clk_release_all(priv->clocks, priv->clock_count);
  98         if (ret)
  99                 error("failed to disable all clocks\n");
 100
 101         return err;
 102 }
 103
 104 static int ohci_usb_remove(struct udevice *dev)
 105 {
 106         struct generic_ohci *priv = dev_get_priv(dev);
 107         int ret;
 108
 109         ret = ohci_deregister(dev);
 110         if (ret)
 111                 return ret;
 112
 113         ret = reset_release_all(priv->resets, priv->reset_count);
 114         if (ret)
 115                 return ret;
 116
 117         return clk_release_all(priv->clocks, priv->clock_count);
 118 }
 119
 120 static const struct udevice_id ohci_usb_ids[] = {
 121         { .compatible = "generic-ohci" },
 122         { }
 123 };
 124
 125 U_BOOT_DRIVER(ohci_generic) = {
 126         .name   = "ohci_generic",
 127         .id     = UCLASS_USB,
 128         .of_match = ohci_usb_ids,
 129         .probe = ohci_usb_probe,
 130         .remove = ohci_usb_remove,
 131         .ops    = &ohci_usb_ops,
 132         .priv_auto_alloc_size = sizeof(struct generic_ohci),
 133         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 134 };