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 #if !defined(CONFIG_USB_OHCI_NEW)
  18 # error "Generic OHCI driver requires CONFIG_USB_OHCI_NEW"
  19 #endif
  20
  21 struct generic_ohci {
  22         ohci_t ohci;
  23         struct clk *clocks;     /* clock list */
  24         struct reset_ctl *resets; /* reset list */
  25         struct phy phy;
  26         int clock_count;        /* number of clock in clock list */
  27         int reset_count;        /* number of reset in reset list */
  28 };
  29
  30 static int ohci_setup_phy(struct udevice *dev, int index)
  31 {
  32         struct generic_ohci *priv = dev_get_priv(dev);
  33         int ret;
  34
  35         ret = generic_phy_get_by_index(dev, index, &priv->phy);
  36         if (ret) {
  37                 if (ret != -ENOENT) {
  38                         dev_err(dev, "failed to get usb phy\n");
  39                         return ret;
  40                 }
  41         } else {
  42                 ret = generic_phy_init(&priv->phy);
  43                 if (ret) {
  44                         dev_dbg(dev, "failed to init usb phy\n");
  45                         return ret;
  46                 }
  47
  48                 ret = generic_phy_power_on(&priv->phy);
  49                 if (ret) {
  50                         dev_dbg(dev, "failed to power on usb phy\n");
  51                         return generic_phy_exit(&priv->phy);
  52                 }
  53         }
  54
  55         return 0;
  56 }
  57
  58 static int ohci_shutdown_phy(struct udevice *dev)
  59 {
  60         struct generic_ohci *priv = dev_get_priv(dev);
  61         int ret = 0;
  62
  63         if (generic_phy_valid(&priv->phy)) {
  64                 ret = generic_phy_power_off(&priv->phy);
  65                 if (ret) {
  66                         dev_dbg(dev, "failed to power off usb phy\n");
  67                         return ret;
  68                 }
  69
  70                 ret = generic_phy_exit(&priv->phy);
  71                 if (ret) {
  72                         dev_dbg(dev, "failed to power off usb phy\n");
  73                         return ret;
  74                 }
  75         }
  76
  77         return 0;
  78 }
  79
  80 static int ohci_usb_probe(struct udevice *dev)
  81 {
  82         struct ohci_regs *regs = dev_read_addr_ptr(dev);
  83         struct generic_ohci *priv = dev_get_priv(dev);
  84         int i, err, ret, clock_nb, reset_nb;
  85
  86         err = 0;
  87         priv->clock_count = 0;
  88         clock_nb = dev_count_phandle_with_args(dev, "clocks", "#clock-cells",
  89                                                0);
  90         if (clock_nb > 0) {
  91                 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
  92                                             GFP_KERNEL);
  93                 if (!priv->clocks)
  94                         return -ENOMEM;
  95
  96                 for (i = 0; i < clock_nb; i++) {
  97                         err = clk_get_by_index(dev, i, &priv->clocks[i]);
  98                         if (err < 0)
  99                                 break;
 100
 101                         err = clk_enable(&priv->clocks[i]);
 102                         if (err && err != -ENOSYS) {
 103                                 dev_err(dev, "failed to enable clock %d\n", i);
 104                                 clk_free(&priv->clocks[i]);
 105                                 goto clk_err;
 106                         }
 107                         priv->clock_count++;
 108                 }
 109         } else if (clock_nb != -ENOENT) {
 110                 dev_err(dev, "failed to get clock phandle(%d)\n", clock_nb);
 111                 return clock_nb;
 112         }
 113
 114         priv->reset_count = 0;
 115         reset_nb = dev_count_phandle_with_args(dev, "resets", "#reset-cells",
 116                                                0);
 117         if (reset_nb > 0) {
 118                 priv->resets = devm_kcalloc(dev, reset_nb,
 119                                             sizeof(struct reset_ctl),
 120                                             GFP_KERNEL);
 121                 if (!priv->resets)
 122                         return -ENOMEM;
 123
 124                 for (i = 0; i < reset_nb; i++) {
 125                         err = reset_get_by_index(dev, i, &priv->resets[i]);
 126                         if (err < 0)
 127                                 break;
 128
 129                         err = reset_deassert(&priv->resets[i]);
 130                         if (err) {
 131                                 dev_err(dev, "failed to deassert reset %d\n", i);
 132                                 reset_free(&priv->resets[i]);
 133                                 goto reset_err;
 134                         }
 135                         priv->reset_count++;
 136                 }
 137         } else if (reset_nb != -ENOENT) {
 138                 dev_err(dev, "failed to get reset phandle(%d)\n", reset_nb);
 139                 goto clk_err;
 140         }
 141
 142         err = ohci_setup_phy(dev, 0);
 143         if (err)
 144                 goto reset_err;
 145
 146         err = ohci_register(dev, regs);
 147         if (err)
 148                 goto phy_err;
 149
 150         return 0;
 151
 152 phy_err:
 153         ret = ohci_shutdown_phy(dev);
 154         if (ret)
 155                 dev_err(dev, "failed to shutdown usb phy\n");
 156
 157 reset_err:
 158         ret = reset_release_all(priv->resets, priv->reset_count);
 159         if (ret)
 160                 dev_err(dev, "failed to assert all resets\n");
 161 clk_err:
 162         ret = clk_release_all(priv->clocks, priv->clock_count);
 163         if (ret)
 164                 dev_err(dev, "failed to disable all clocks\n");
 165
 166         return err;
 167 }
 168
 169 static int ohci_usb_remove(struct udevice *dev)
 170 {
 171         struct generic_ohci *priv = dev_get_priv(dev);
 172         int ret;
 173
 174         ret = ohci_deregister(dev);
 175         if (ret)
 176                 return ret;
 177
 178         ret = ohci_shutdown_phy(dev);
 179         if (ret)
 180                 return ret;
 181
 182         ret = reset_release_all(priv->resets, priv->reset_count);
 183         if (ret)
 184                 return ret;
 185
 186         return clk_release_all(priv->clocks, priv->clock_count);
 187 }
 188
 189 static const struct udevice_id ohci_usb_ids[] = {
 190         { .compatible = "generic-ohci" },
 191         { }
 192 };
 193
 194 U_BOOT_DRIVER(ohci_generic) = {
 195         .name   = "ohci_generic",
 196         .id     = UCLASS_USB,
 197         .of_match = ohci_usb_ids,
 198         .probe = ohci_usb_probe,
 199         .remove = ohci_usb_remove,
 200         .ops    = &ohci_usb_ops,
 201         .priv_auto      = sizeof(struct generic_ohci),
 202         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 203 };