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 <dt-structs.h>
  14 #include <errno.h>
  15
  16 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
  17 {
  18         return (const struct clk_ops *)dev->driver->ops;
  19 }
  20
  21 #if CONFIG_IS_ENABLED(OF_CONTROL)
  22 # if CONFIG_IS_ENABLED(OF_PLATDATA)
  23 int clk_get_by_index_platdata(struct udevice *dev, int index,
  24                               struct phandle_1_arg *cells, struct clk *clk)
  25 {
  26         int ret;
  27
  28         if (index != 0)
  29                 return -ENOSYS;
  30         ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
  31         if (ret)
  32                 return ret;
  33         clk->id = cells[0].arg[0];
  34
  35         return 0;
  36 }
  37 # else
  38 static int clk_of_xlate_default(struct clk *clk,
  39                                 struct ofnode_phandle_args *args)
  40 {
  41         debug("%s(clk=%p)\n", __func__, clk);
  42
  43         if (args->args_count > 1) {
  44                 debug("Invaild args_count: %d\n", args->args_count);
  45                 return -EINVAL;
  46         }
  47
  48         if (args->args_count)
  49                 clk->id = args->args[0];
  50         else
  51                 clk->id = 0;
  52
  53         return 0;
  54 }
  55
  56 static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
  57                                    int index, struct clk *clk)
  58 {
  59         int ret;
  60         struct ofnode_phandle_args args;
  61         struct udevice *dev_clk;
  62         const struct clk_ops *ops;
  63
  64         debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
  65
  66         assert(clk);
  67         clk->dev = NULL;
  68
  69         ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
  70                                          index, &args);
  71         if (ret) {
  72                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
  73                       __func__, ret);
  74                 return ret;
  75         }
  76
  77         ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
  78         if (ret) {
  79                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
  80                       __func__, ret);
  81                 return ret;
  82         }
  83
  84         clk->dev = dev_clk;
  85
  86         ops = clk_dev_ops(dev_clk);
  87
  88         if (ops->of_xlate)
  89                 ret = ops->of_xlate(clk, &args);
  90         else
  91                 ret = clk_of_xlate_default(clk, &args);
  92         if (ret) {
  93                 debug("of_xlate() failed: %d\n", ret);
  94                 return ret;
  95         }
  96
  97         return clk_request(dev_clk, clk);
  98 }
  99
 100 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
 101 {
 102         return clk_get_by_indexed_prop(dev, "clocks", index, clk);
 103 }
 104 # endif /* OF_PLATDATA */
 105
 106 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
 107 {
 108         int index;
 109
 110         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
 111         clk->dev = NULL;
 112
 113         index = dev_read_stringlist_search(dev, "clock-names", name);
 114         if (index < 0) {
 115                 debug("fdt_stringlist_search() failed: %d\n", index);
 116                 return index;
 117         }
 118
 119         return clk_get_by_index(dev, index, clk);
 120 }
 121
 122 int clk_release_all(struct clk *clk, int count)
 123 {
 124         int i, ret;
 125
 126         for (i = 0; i < count; i++) {
 127                 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
 128
 129                 /* check if clock has been previously requested */
 130                 if (!clk[i].dev)
 131                         continue;
 132
 133                 ret = clk_disable(&clk[i]);
 134                 if (ret && ret != -ENOSYS)
 135                         return ret;
 136
 137                 ret = clk_free(&clk[i]);
 138                 if (ret && ret != -ENOSYS)
 139                         return ret;
 140         }
 141
 142         return 0;
 143 }
 144
 145 #endif /* OF_CONTROL */
 146
 147 int clk_request(struct udevice *dev, struct clk *clk)
 148 {
 149         const struct clk_ops *ops = clk_dev_ops(dev);
 150
 151         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
 152
 153         clk->dev = dev;
 154
 155         if (!ops->request)
 156                 return 0;
 157
 158         return ops->request(clk);
 159 }
 160
 161 int clk_free(struct clk *clk)
 162 {
 163         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 164
 165         debug("%s(clk=%p)\n", __func__, clk);
 166
 167         if (!ops->free)
 168                 return 0;
 169
 170         return ops->free(clk);
 171 }
 172
 173 ulong clk_get_rate(struct clk *clk)
 174 {
 175         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 176
 177         debug("%s(clk=%p)\n", __func__, clk);
 178
 179         if (!ops->get_rate)
 180                 return -ENOSYS;
 181
 182         return ops->get_rate(clk);
 183 }
 184
 185 ulong clk_set_rate(struct clk *clk, ulong rate)
 186 {
 187         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 188
 189         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
 190
 191         if (!ops->set_rate)
 192                 return -ENOSYS;
 193
 194         return ops->set_rate(clk, rate);
 195 }
 196
 197 int clk_set_parent(struct clk *clk, struct clk *parent)
 198 {
 199         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 200
 201         debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
 202
 203         if (!ops->set_parent)
 204                 return -ENOSYS;
 205
 206         return ops->set_parent(clk, parent);
 207 }
 208
 209 int clk_enable(struct clk *clk)
 210 {
 211         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 212
 213         debug("%s(clk=%p)\n", __func__, clk);
 214
 215         if (!ops->enable)
 216                 return -ENOSYS;
 217
 218         return ops->enable(clk);
 219 }
 220
 221 int clk_disable(struct clk *clk)
 222 {
 223         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 224
 225         debug("%s(clk=%p)\n", __func__, clk);
 226
 227         if (!ops->disable)
 228                 return -ENOSYS;
 229
 230         return ops->disable(clk);
 231 }
 232
 233 UCLASS_DRIVER(clk) = {
 234         .id             = UCLASS_CLK,
 235         .name           = "clk",
 236 };