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 <log.h>
  10 #include <dm/device_compat.h>
  11 #include <dm/devres.h>
  12 #include <dm/ofnode.h>
  13 #include <generic-phy.h>
  14 #include <reset.h>
  15 #include "ohci.h"
  16
  17 struct generic_ohci {
  18         ohci_t ohci;
  19         struct clk *clocks;     /* clock list */
  20         struct reset_ctl *resets; /* reset list */
  21         struct phy phy;
  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_setup_phy(struct udevice *dev, int index)
  27 {
  28         struct generic_ohci *priv = dev_get_priv(dev);
  29         int ret;
  30
  31         ret = generic_phy_get_by_index(dev, index, &priv->phy);
  32         if (ret) {
  33                 if (ret != -ENOENT) {
  34                         dev_err(dev, "failed to get usb phy\n");
  35                         return ret;
  36                 }
  37         } else {
  38                 ret = generic_phy_init(&priv->phy);
  39                 if (ret) {
  40                         dev_dbg(dev, "failed to init usb phy\n");
  41                         return ret;
  42                 }
  43
  44                 ret = generic_phy_power_on(&priv->phy);
  45                 if (ret) {
  46                         dev_dbg(dev, "failed to power on usb phy\n");
  47                         return generic_phy_exit(&priv->phy);
  48                 }
  49         }
  50
  51         return 0;
  52 }
  53
  54 static int ohci_shutdown_phy(struct udevice *dev)
  55 {
  56         struct generic_ohci *priv = dev_get_priv(dev);
  57         int ret = 0;
  58
  59         if (generic_phy_valid(&priv->phy)) {
  60                 ret = generic_phy_power_off(&priv->phy);
  61                 if (ret) {
  62                         dev_dbg(dev, "failed to power off usb phy\n");
  63                         return ret;
  64                 }
  65
  66                 ret = generic_phy_exit(&priv->phy);
  67                 if (ret) {
  68                         dev_dbg(dev, "failed to power off usb phy\n");
  69                         return ret;
  70                 }
  71         }
  72
  73         return 0;
  74 }
  75
  76 static int ohci_usb_probe(struct udevice *dev)
  77 {
  78         struct ohci_regs *regs = dev_read_addr_ptr(dev);
  79         struct generic_ohci *priv = dev_get_priv(dev);
  80         int i, err, ret, clock_nb, reset_nb;
  81
  82         err = 0;
  83         priv->clock_count = 0;
  84         clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells",
  85                                                0);
  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                                                0);
 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      = sizeof(struct generic_ohci),
 198         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 199 };