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