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_err(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_err(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_err(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_err(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         if (clock_nb > 0) {
  90                 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
  91                                             GFP_KERNEL);
  92                 if (!priv->clocks)
  93                         return -ENOMEM;
  94
  95                 for (i = 0; i < clock_nb; i++) {
  96                         err = clk_get_by_index(dev, i, &priv->clocks[i]);
  97                         if (err < 0)
  98                                 break;
  99
 100                         err = clk_enable(&priv->clocks[i]);
 101                         if (err && err != -ENOSYS) {
 102                                 dev_err(dev, "failed to enable clock %d\n", i);
 103                                 clk_free(&priv->clocks[i]);
 104                                 goto clk_err;
 105                         }
 106                         priv->clock_count++;
 107                 }
 108         } else if (clock_nb != -ENOENT) {
 109                 dev_err(dev, "failed to get clock phandle(%d)\n", clock_nb);
 110                 return clock_nb;
 111         }
 112
 113         priv->reset_count = 0;
 114         reset_nb = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
 115         if (reset_nb > 0) {
 116                 priv->resets = devm_kcalloc(dev, reset_nb,
 117                                             sizeof(struct reset_ctl),
 118                                             GFP_KERNEL);
 119                 if (!priv->resets)
 120                         return -ENOMEM;
 121
 122                 for (i = 0; i < reset_nb; i++) {
 123                         err = reset_get_by_index(dev, i, &priv->resets[i]);
 124                         if (err < 0)
 125                                 break;
 126
 127                         err = reset_deassert(&priv->resets[i]);
 128                         if (err) {
 129                                 dev_err(dev, "failed to deassert reset %d\n", i);
 130                                 reset_free(&priv->resets[i]);
 131                                 goto reset_err;
 132                         }
 133                         priv->reset_count++;
 134                 }
 135         } else if (reset_nb != -ENOENT) {
 136                 dev_err(dev, "failed to get reset phandle(%d)\n", reset_nb);
 137                 goto clk_err;
 138         }
 139
 140         err = ohci_setup_phy(dev, 0);
 141         if (err)
 142                 goto reset_err;
 143
 144         err = ohci_register(dev, regs);
 145         if (err)
 146                 goto phy_err;
 147
 148         return 0;
 149
 150 phy_err:
 151         ret = ohci_shutdown_phy(dev);
 152         if (ret)
 153                 dev_err(dev, "failed to shutdown usb phy\n");
 154
 155 reset_err:
 156         ret = reset_release_all(priv->resets, priv->reset_count);
 157         if (ret)
 158                 dev_err(dev, "failed to assert all resets\n");
 159 clk_err:
 160         ret = clk_release_all(priv->clocks, priv->clock_count);
 161         if (ret)
 162                 dev_err(dev, "failed to disable all clocks\n");
 163
 164         return err;
 165 }
 166
 167 static int ohci_usb_remove(struct udevice *dev)
 168 {
 169         struct generic_ohci *priv = dev_get_priv(dev);
 170         int ret;
 171
 172         ret = ohci_deregister(dev);
 173         if (ret)
 174                 return ret;
 175
 176         ret = ohci_shutdown_phy(dev);
 177         if (ret)
 178                 return ret;
 179
 180         ret = reset_release_all(priv->resets, priv->reset_count);
 181         if (ret)
 182                 return ret;
 183
 184         return clk_release_all(priv->clocks, priv->clock_count);
 185 }
 186
 187 static const struct udevice_id ohci_usb_ids[] = {
 188         { .compatible = "generic-ohci" },
 189         { }
 190 };
 191
 192 U_BOOT_DRIVER(ohci_generic) = {
 193         .name   = "ohci_generic",
 194         .id     = UCLASS_USB,
 195         .of_match = ohci_usb_ids,
 196         .probe = ohci_usb_probe,
 197         .remove = ohci_usb_remove,
 198         .ops    = &ohci_usb_ops,
 199         .priv_auto_alloc_size = sizeof(struct generic_ohci),
 200         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 201 };