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 <generic-phy.h>
  12 #include <reset.h>
  13 #include "ohci.h"
  14
  15 #if !defined(CONFIG_USB_OHCI_NEW)
  16 # error "Generic OHCI driver requires CONFIG_USB_OHCI_NEW"
  17 #endif
  18
  19 struct generic_ohci {
  20         ohci_t ohci;
  21         struct clk *clocks;     /* clock list */
  22         struct reset_ctl *resets; /* reset list */
  23         struct phy phy;
  24         int clock_count;        /* number of clock in clock list */
  25         int reset_count;        /* number of reset in reset list */
  26 };
  27
  28 static int ohci_setup_phy(struct udevice *dev, int index)
  29 {
  30         struct generic_ohci *priv = dev_get_priv(dev);
  31         int ret;
  32
  33         ret = generic_phy_get_by_index(dev, index, &priv->phy);
  34         if (ret) {
  35                 if (ret != -ENOENT) {
  36                         dev_err(dev, "failed to get usb phy\n");
  37                         return ret;
  38                 }
  39         } else {
  40                 ret = generic_phy_init(&priv->phy);
  41                 if (ret) {
  42                         dev_err(dev, "failed to init usb phy\n");
  43                         return ret;
  44                 }
  45
  46                 ret = generic_phy_power_on(&priv->phy);
  47                 if (ret) {
  48                         dev_err(dev, "failed to power on usb phy\n");
  49                         return generic_phy_exit(&priv->phy);
  50                 }
  51         }
  52
  53         return 0;
  54 }
  55
  56 static int ohci_shutdown_phy(struct udevice *dev)
  57 {
  58         struct generic_ohci *priv = dev_get_priv(dev);
  59         int ret = 0;
  60
  61         if (generic_phy_valid(&priv->phy)) {
  62                 ret = generic_phy_power_off(&priv->phy);
  63                 if (ret) {
  64                         dev_err(dev, "failed to power off usb phy\n");
  65                         return ret;
  66                 }
  67
  68                 ret = generic_phy_exit(&priv->phy);
  69                 if (ret) {
  70                         dev_err(dev, "failed to power off usb phy\n");
  71                         return ret;
  72                 }
  73         }
  74
  75         return 0;
  76 }
  77
  78 static int ohci_usb_probe(struct udevice *dev)
  79 {
  80         struct ohci_regs *regs = (struct ohci_regs *)devfdt_get_addr(dev);
  81         struct generic_ohci *priv = dev_get_priv(dev);
  82         int i, err, ret, clock_nb, reset_nb;
  83
  84         err = 0;
  85         priv->clock_count = 0;
  86         clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
  87         if (clock_nb > 0) {
  88                 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
  89                                             GFP_KERNEL);
  90                 if (!priv->clocks)
  91                         return -ENOMEM;
  92
  93                 for (i = 0; i < clock_nb; i++) {
  94                         err = clk_get_by_index(dev, i, &priv->clocks[i]);
  95                         if (err < 0)
  96                                 break;
  97
  98                         err = clk_enable(&priv->clocks[i]);
  99                         if (err) {
 100                                 dev_err(dev, "failed to enable clock %d\n", i);
 101                                 clk_free(&priv->clocks[i]);
 102                                 goto clk_err;
 103                         }
 104                         priv->clock_count++;
 105                 }
 106         } else if (clock_nb != -ENOENT) {
 107                 dev_err(dev, "failed to get clock phandle(%d)\n", clock_nb);
 108                 return clock_nb;
 109         }
 110
 111         priv->reset_count = 0;
 112         reset_nb = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
 113         if (reset_nb > 0) {
 114                 priv->resets = devm_kcalloc(dev, reset_nb,
 115                                             sizeof(struct reset_ctl),
 116                                             GFP_KERNEL);
 117                 if (!priv->resets)
 118                         return -ENOMEM;
 119
 120                 for (i = 0; i < reset_nb; i++) {
 121                         err = reset_get_by_index(dev, i, &priv->resets[i]);
 122                         if (err < 0)
 123                                 break;
 124
 125                         err = reset_deassert(&priv->resets[i]);
 126                         if (err) {
 127                                 dev_err(dev, "failed to deassert reset %d\n", i);
 128                                 reset_free(&priv->resets[i]);
 129                                 goto reset_err;
 130                         }
 131                         priv->reset_count++;
 132                 }
 133         } else if (reset_nb != -ENOENT) {
 134                 dev_err(dev, "failed to get reset phandle(%d)\n", reset_nb);
 135                 goto clk_err;
 136         }
 137
 138         err = ohci_setup_phy(dev, 0);
 139         if (err)
 140                 goto reset_err;
 141
 142         err = ohci_register(dev, regs);
 143         if (err)
 144                 goto phy_err;
 145
 146         return 0;
 147
 148 phy_err:
 149         ret = ohci_shutdown_phy(dev);
 150         if (ret)
 151                 dev_err(dev, "failed to shutdown usb phy\n");
 152
 153 reset_err:
 154         ret = reset_release_all(priv->resets, priv->reset_count);
 155         if (ret)
 156                 dev_err(dev, "failed to assert all resets\n");
 157 clk_err:
 158         ret = clk_release_all(priv->clocks, priv->clock_count);
 159         if (ret)
 160                 dev_err(dev, "failed to disable all clocks\n");
 161
 162         return err;
 163 }
 164
 165 static int ohci_usb_remove(struct udevice *dev)
 166 {
 167         struct generic_ohci *priv = dev_get_priv(dev);
 168         int ret;
 169
 170         ret = ohci_deregister(dev);
 171         if (ret)
 172                 return ret;
 173
 174         ret = ohci_shutdown_phy(dev);
 175         if (ret)
 176                 return ret;
 177
 178         ret = reset_release_all(priv->resets, priv->reset_count);
 179         if (ret)
 180                 return ret;
 181
 182         return clk_release_all(priv->clocks, priv->clock_count);
 183 }
 184
 185 static const struct udevice_id ohci_usb_ids[] = {
 186         { .compatible = "generic-ohci" },
 187         { }
 188 };
 189
 190 U_BOOT_DRIVER(ohci_generic) = {
 191         .name   = "ohci_generic",
 192         .id     = UCLASS_USB,
 193         .of_match = ohci_usb_ids,
 194         .probe = ohci_usb_probe,
 195         .remove = ohci_usb_remove,
 196         .ops    = &ohci_usb_ops,
 197         .priv_auto_alloc_size = sizeof(struct generic_ohci),
 198         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 199 };