git.sur5r.net Git - u-boot/blob - drivers/usb/host/ehci-generic.c

   1 /*
   2  * Copyright (C) 2015 Alexey Brodkin <abrodkin@synopsys.com>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <clk.h>
   9 #include <dm/ofnode.h>
  10 #include <generic-phy.h>
  11 #include <reset.h>
  12 #include <asm/io.h>
  13 #include <dm.h>
  14 #include "ehci.h"
  15
  16 /*
  17  * Even though here we don't explicitly use "struct ehci_ctrl"
  18  * ehci_register() expects it to be the first thing that resides in
  19  * device's private data.
  20  */
  21 struct generic_ehci {
  22         struct ehci_ctrl ctrl;
  23         struct clk *clocks;
  24         struct reset_ctl *resets;
  25         struct phy phy;
  26         int clock_count;
  27         int reset_count;
  28 };
  29
  30 static int ehci_setup_phy(struct udevice *dev, int index)
  31 {
  32         struct generic_ehci *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 ehci_shutdown_phy(struct udevice *dev)
  59 {
  60         struct generic_ehci *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 ehci_usb_probe(struct udevice *dev)
  81 {
  82         struct generic_ehci *priv = dev_get_priv(dev);
  83         struct ehci_hccr *hccr;
  84         struct ehci_hcor *hcor;
  85         int i, err, ret, clock_nb, reset_nb;
  86
  87         err = 0;
  88         priv->clock_count = 0;
  89         clock_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "clocks",
  90                                                   "#clock-cells");
  91         if (clock_nb > 0) {
  92                 priv->clocks = devm_kcalloc(dev, clock_nb, sizeof(struct clk),
  93                                             GFP_KERNEL);
  94                 if (!priv->clocks)
  95                         return -ENOMEM;
  96
  97                 for (i = 0; i < clock_nb; i++) {
  98                         err = clk_get_by_index(dev, i, &priv->clocks[i]);
  99
 100                         if (err < 0)
 101                                 break;
 102                         err = clk_enable(&priv->clocks[i]);
 103                         if (err) {
 104                                 dev_err(dev, "failed to enable clock %d\n", i);
 105                                 clk_free(&priv->clocks[i]);
 106                                 goto clk_err;
 107                         }
 108                         priv->clock_count++;
 109                 }
 110         } else {
 111                 if (clock_nb != -ENOENT) {
 112                         dev_err(dev, "failed to get clock phandle(%d)\n",
 113                                 clock_nb);
 114                         return clock_nb;
 115                 }
 116         }
 117
 118         priv->reset_count = 0;
 119         reset_nb = ofnode_count_phandle_with_args(dev_ofnode(dev), "resets",
 120                                                   "#reset-cells");
 121         if (reset_nb > 0) {
 122                 priv->resets = devm_kcalloc(dev, reset_nb,
 123                                             sizeof(struct reset_ctl),
 124                                             GFP_KERNEL);
 125                 if (!priv->resets)
 126                         return -ENOMEM;
 127
 128                 for (i = 0; i < reset_nb; i++) {
 129                         err = reset_get_by_index(dev, i, &priv->resets[i]);
 130                         if (err < 0)
 131                                 break;
 132
 133                         if (reset_deassert(&priv->resets[i])) {
 134                                 dev_err(dev, "failed to deassert reset %d\n",
 135                                         i);
 136                                 reset_free(&priv->resets[i]);
 137                                 goto reset_err;
 138                         }
 139                         priv->reset_count++;
 140                 }
 141         } else {
 142                 if (reset_nb != -ENOENT) {
 143                         dev_err(dev, "failed to get reset phandle(%d)\n",
 144                                 reset_nb);
 145                         goto clk_err;
 146                 }
 147         }
 148
 149         err = ehci_setup_phy(dev, 0);
 150         if (err)
 151                 goto reset_err;
 152
 153         hccr = map_physmem(dev_read_addr(dev), 0x100, MAP_NOCACHE);
 154         hcor = (struct ehci_hcor *)((uintptr_t)hccr +
 155                                     HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
 156
 157         err = ehci_register(dev, hccr, hcor, NULL, 0, USB_INIT_HOST);
 158         if (err)
 159                 goto phy_err;
 160
 161         return 0;
 162
 163 phy_err:
 164         ret = ehci_shutdown_phy(dev);
 165         if (ret)
 166                 dev_err(dev, "failed to shutdown usb phy\n");
 167
 168 reset_err:
 169         ret = reset_release_all(priv->resets, priv->reset_count);
 170         if (ret)
 171                 dev_err(dev, "failed to assert all resets\n");
 172 clk_err:
 173         ret = clk_release_all(priv->clocks, priv->clock_count);
 174         if (ret)
 175                 dev_err(dev, "failed to disable all clocks\n");
 176
 177         return err;
 178 }
 179
 180 static int ehci_usb_remove(struct udevice *dev)
 181 {
 182         struct generic_ehci *priv = dev_get_priv(dev);
 183         int ret;
 184
 185         ret = ehci_deregister(dev);
 186         if (ret)
 187                 return ret;
 188
 189         ret = ehci_shutdown_phy(dev);
 190         if (ret)
 191                 return ret;
 192
 193         ret =  reset_release_all(priv->resets, priv->reset_count);
 194         if (ret)
 195                 return ret;
 196
 197         return clk_release_all(priv->clocks, priv->clock_count);
 198 }
 199
 200 static const struct udevice_id ehci_usb_ids[] = {
 201         { .compatible = "generic-ehci" },
 202         { }
 203 };
 204
 205 U_BOOT_DRIVER(ehci_generic) = {
 206         .name   = "ehci_generic",
 207         .id     = UCLASS_USB,
 208         .of_match = ehci_usb_ids,
 209         .probe = ehci_usb_probe,
 210         .remove = ehci_usb_remove,
 211         .ops    = &ehci_usb_ops,
 212         .priv_auto_alloc_size = sizeof(struct generic_ehci),
 213         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 214 };