drivers/usb/host/ohci-generic.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
   4  */
   5
   6 #include <common.h>
   7 #include <clk.h>
   8 #include <dm.h>
   9 #include <dm/device_compat.h>
  10 #include <dm/devres.h>
  11 #include <dm/ofnode.h>
  12 #include <generic-phy.h>
  13 #include <reset.h>
  14 #include "ohci.h"
  15
  16 #if !defined(CONFIG_USB_OHCI_NEW)
  17 # error "Generic OHCI driver requires CONFIG_USB_OHCI_NEW"
  18 #endif
  19
  20 struct generic_ohci {
  21         ohci_t ohci;
  22         struct clk *clocks;     /* clock list */
  23         struct reset_ctl *resets; /* reset list */
  24         struct phy phy;
  25         int clock_count;        /* number of clock in clock list */
  26         int reset_count;        /* number of reset in reset list */
  27 };
  28
  29 static int ohci_setup_phy(struct udevice *dev, int index)
  30 {
  31         struct generic_ohci *priv = dev_get_priv(dev);
  32         int ret;
  33
  34         ret = generic_phy_get_by_index(dev, index, &priv->phy);
  35         if (ret) {
  36                 if (ret != -ENOENT) {
  37                         dev_err(dev, "failed to get usb phy\n");
  38                         return ret;
  39                 }
  40         } else {
  41                 ret = generic_phy_init(&priv->phy);
  42                 if (ret) {
  43                         dev_err(dev, "failed to init usb phy\n");
  44                         return ret;
  45                 }
  46
  47                 ret = generic_phy_power_on(&priv->phy);
  48                 if (ret) {
  49                         dev_err(dev, "failed to power on usb phy\n");
  50                         return generic_phy_exit(&priv->phy);
  51                 }
  52         }
  53
  54         return 0;
  55 }
  56
  57 static int ohci_shutdown_phy(struct udevice *dev)
  58 {
  59         struct generic_ohci *priv = dev_get_priv(dev);
  60         int ret = 0;
  61
  62         if (generic_phy_valid(&priv->phy)) {
  63                 ret = generic_phy_power_off(&priv->phy);
  64                 if (ret) {
  65                         dev_err(dev, "failed to power off usb phy\n");
  66                         return ret;
  67                 }
  68
  69                 ret = generic_phy_exit(&priv->phy);
  70                 if (ret) {
  71                         dev_err(dev, "failed to power off usb phy\n");
  72                         return ret;
  73                 }
  74         }
  75
  76         return 0;
  77 }
  78
  79 static int ohci_usb_probe(struct udevice *dev)
  80 {
  81         struct ohci_regs *regs = (struct ohci_regs *)devfdt_get_addr(dev);
  82         struct generic_ohci *priv = dev_get_priv(dev);
  83         int i, err, ret, clock_nb, reset_nb;
  84
  85         err = 0;
  86         priv->clock_count = 0;
  87         clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
  88         if (clock_nb > 0) {
  89                 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
  90                                             GFP_KERNEL);
  91                 if (!priv->clocks)
  92                         return -ENOMEM;
  93
  94                 for (i = 0; i < clock_nb; i++) {
  95                         err = clk_get_by_index(dev, i, &priv->clocks[i]);
  96                         if (err < 0)
  97                                 break;
  98
  99                         err = clk_enable(&priv->clocks[i]);
 100                         if (err && err != -ENOSYS) {
 101                                 dev_err(dev, "failed to enable clock %d\n", i);
 102                                 clk_free(&priv->clocks[i]);
 103                                 goto clk_err;
 104                         }
 105                         priv->clock_count++;
 106                 }
 107         } else if (clock_nb != -ENOENT) {
 108                 dev_err(dev, "failed to get clock phandle(%d)\n", clock_nb);
 109                 return clock_nb;
 110         }
 111
 112         priv->reset_count = 0;
 113         reset_nb = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
 114         if (reset_nb > 0) {
 115                 priv->resets = devm_kcalloc(dev, reset_nb,
 116                                             sizeof(struct reset_ctl),
 117                                             GFP_KERNEL);
 118                 if (!priv->resets)
 119                         return -ENOMEM;
 120
 121                 for (i = 0; i < reset_nb; i++) {
 122                         err = reset_get_by_index(dev, i, &priv->resets[i]);
 123                         if (err < 0)
 124                                 break;
 125
 126                         err = reset_deassert(&priv->resets[i]);
 127                         if (err) {
 128                                 dev_err(dev, "failed to deassert reset %d\n", i);
 129                                 reset_free(&priv->resets[i]);
 130                                 goto reset_err;
 131                         }
 132                         priv->reset_count++;
 133                 }
 134         } else if (reset_nb != -ENOENT) {
 135                 dev_err(dev, "failed to get reset phandle(%d)\n", reset_nb);
 136                 goto clk_err;
 137         }
 138
 139         err = ohci_setup_phy(dev, 0);
 140         if (err)
 141                 goto reset_err;
 142
 143         err = ohci_register(dev, regs);
 144         if (err)
 145                 goto phy_err;
 146
 147         return 0;
 148
 149 phy_err:
 150         ret = ohci_shutdown_phy(dev);
 151         if (ret)
 152                 dev_err(dev, "failed to shutdown usb phy\n");
 153
 154 reset_err:
 155         ret = reset_release_all(priv->resets, priv->reset_count);
 156         if (ret)
 157                 dev_err(dev, "failed to assert all resets\n");
 158 clk_err:
 159         ret = clk_release_all(priv->clocks, priv->clock_count);
 160         if (ret)
 161                 dev_err(dev, "failed to disable all clocks\n");
 162
 163         return err;
 164 }
 165
 166 static int ohci_usb_remove(struct udevice *dev)
 167 {
 168         struct generic_ohci *priv = dev_get_priv(dev);
 169         int ret;
 170
 171         ret = ohci_deregister(dev);
 172         if (ret)
 173                 return ret;
 174
 175         ret = ohci_shutdown_phy(dev);
 176         if (ret)
 177                 return ret;
 178
 179         ret = reset_release_all(priv->resets, priv->reset_count);
 180         if (ret)
 181                 return ret;
 182
 183         return clk_release_all(priv->clocks, priv->clock_count);
 184 }
 185
 186 static const struct udevice_id ohci_usb_ids[] = {
 187         { .compatible = "generic-ohci" },
 188         { }
 189 };
 190
 191 U_BOOT_DRIVER(ohci_generic) = {
 192         .name   = "ohci_generic",
 193         .id     = UCLASS_USB,
 194         .of_match = ohci_usb_ids,
 195         .probe = ohci_usb_probe,
 196         .remove = ohci_usb_remove,
 197         .ops    = &ohci_usb_ops,
 198         .priv_auto_alloc_size = sizeof(struct generic_ohci),
 199         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 200 };