drivers/clk/clk-uclass.c

   1 /*
   2  * Copyright (C) 2015 Google, Inc
   3  * Written by Simon Glass <sjg@chromium.org>
   4  * Copyright (c) 2016, NVIDIA CORPORATION.
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <clk.h>
  11 #include <clk-uclass.h>
  12 #include <dm.h>
  13 #include <errno.h>
  14
  15 DECLARE_GLOBAL_DATA_PTR;
  16
  17 static inline struct clk_ops *clk_dev_ops(struct udevice *dev)
  18 {
  19         return (struct clk_ops *)dev->driver->ops;
  20 }
  21
  22 #if CONFIG_IS_ENABLED(OF_CONTROL)
  23 #ifdef CONFIG_SPL_BUILD
  24 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
  25 {
  26         int ret;
  27         u32 cell[2];
  28
  29         if (index != 0)
  30                 return -ENOSYS;
  31         assert(clk);
  32         ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
  33         if (ret)
  34                 return ret;
  35         ret = fdtdec_get_int_array(gd->fdt_blob, dev->of_offset, "clocks",
  36                                    cell, 2);
  37         if (ret)
  38                 return ret;
  39         clk->id = cell[1];
  40         return 0;
  41 }
  42
  43 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
  44 {
  45         return -ENOSYS;
  46 }
  47 #else
  48 static int clk_of_xlate_default(struct clk *clk,
  49                                 struct fdtdec_phandle_args *args)
  50 {
  51         debug("%s(clk=%p)\n", __func__, clk);
  52
  53         if (args->args_count > 1) {
  54                 debug("Invaild args_count: %d\n", args->args_count);
  55                 return -EINVAL;
  56         }
  57
  58         if (args->args_count)
  59                 clk->id = args->args[0];
  60         else
  61                 clk->id = 0;
  62
  63         return 0;
  64 }
  65
  66 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
  67 {
  68         int ret;
  69         struct fdtdec_phandle_args args;
  70         struct udevice *dev_clk;
  71         struct clk_ops *ops;
  72
  73         debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
  74
  75         assert(clk);
  76         ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev->of_offset,
  77                                              "clocks", "#clock-cells", 0, index,
  78                                              &args);
  79         if (ret) {
  80                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
  81                       __func__, ret);
  82                 return ret;
  83         }
  84
  85         ret = uclass_get_device_by_of_offset(UCLASS_CLK, args.node, &dev_clk);
  86         if (ret) {
  87                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
  88                       __func__, ret);
  89                 return ret;
  90         }
  91         ops = clk_dev_ops(dev_clk);
  92
  93         if (ops->of_xlate)
  94                 ret = ops->of_xlate(clk, &args);
  95         else
  96                 ret = clk_of_xlate_default(clk, &args);
  97         if (ret) {
  98                 debug("of_xlate() failed: %d\n", ret);
  99                 return ret;
 100         }
 101
 102         return clk_request(dev_clk, clk);
 103 }
 104
 105 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
 106 {
 107         int index;
 108
 109         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
 110
 111         index = fdt_find_string(gd->fdt_blob, dev->of_offset, "clock-names",
 112                                 name);
 113         if (index < 0) {
 114                 debug("fdt_find_string() failed: %d\n", index);
 115                 return index;
 116         }
 117
 118         return clk_get_by_index(dev, index, clk);
 119 }
 120 #endif
 121 #endif
 122
 123 int clk_request(struct udevice *dev, struct clk *clk)
 124 {
 125         struct clk_ops *ops = clk_dev_ops(dev);
 126
 127         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
 128
 129         clk->dev = dev;
 130
 131         if (!ops->request)
 132                 return 0;
 133
 134         return ops->request(clk);
 135 }
 136
 137 int clk_free(struct clk *clk)
 138 {
 139         struct clk_ops *ops = clk_dev_ops(clk->dev);
 140
 141         debug("%s(clk=%p)\n", __func__, clk);
 142
 143         if (!ops->free)
 144                 return 0;
 145
 146         return ops->free(clk);
 147 }
 148
 149 ulong clk_get_rate(struct clk *clk)
 150 {
 151         struct clk_ops *ops = clk_dev_ops(clk->dev);
 152
 153         debug("%s(clk=%p)\n", __func__, clk);
 154
 155         if (!ops->get_rate)
 156                 return -ENOSYS;
 157
 158         return ops->get_rate(clk);
 159 }
 160
 161 ulong clk_set_rate(struct clk *clk, ulong rate)
 162 {
 163         struct clk_ops *ops = clk_dev_ops(clk->dev);
 164
 165         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
 166
 167         if (!ops->set_rate)
 168                 return -ENOSYS;
 169
 170         return ops->set_rate(clk, rate);
 171 }
 172
 173 int clk_enable(struct clk *clk)
 174 {
 175         struct clk_ops *ops = clk_dev_ops(clk->dev);
 176
 177         debug("%s(clk=%p)\n", __func__, clk);
 178
 179         if (!ops->enable)
 180                 return -ENOSYS;
 181
 182         return ops->enable(clk);
 183 }
 184
 185 int clk_disable(struct clk *clk)
 186 {
 187         struct clk_ops *ops = clk_dev_ops(clk->dev);
 188
 189         debug("%s(clk=%p)\n", __func__, clk);
 190
 191         if (!ops->disable)
 192                 return -ENOSYS;
 193
 194         return ops->disable(clk);
 195 }
 196
 197 UCLASS_DRIVER(clk) = {
 198         .id             = UCLASS_CLK,
 199         .name           = "clk",
 200 };