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  * Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <clk.h>
  12 #include <clk-uclass.h>
  13 #include <dm.h>
  14 #include <dm/read.h>
  15 #include <dt-structs.h>
  16 #include <errno.h>
  17
  18 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
  19 {
  20         return (const struct clk_ops *)dev->driver->ops;
  21 }
  22
  23 #if CONFIG_IS_ENABLED(OF_CONTROL)
  24 # if CONFIG_IS_ENABLED(OF_PLATDATA)
  25 int clk_get_by_index_platdata(struct udevice *dev, int index,
  26                               struct phandle_1_arg *cells, struct clk *clk)
  27 {
  28         int ret;
  29
  30         if (index != 0)
  31                 return -ENOSYS;
  32         ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
  33         if (ret)
  34                 return ret;
  35         clk->id = cells[0].arg[0];
  36
  37         return 0;
  38 }
  39 # else
  40 static int clk_of_xlate_default(struct clk *clk,
  41                                 struct ofnode_phandle_args *args)
  42 {
  43         debug("%s(clk=%p)\n", __func__, clk);
  44
  45         if (args->args_count > 1) {
  46                 debug("Invaild args_count: %d\n", args->args_count);
  47                 return -EINVAL;
  48         }
  49
  50         if (args->args_count)
  51                 clk->id = args->args[0];
  52         else
  53                 clk->id = 0;
  54
  55         return 0;
  56 }
  57
  58 static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
  59                                    int index, struct clk *clk)
  60 {
  61         int ret;
  62         struct ofnode_phandle_args args;
  63         struct udevice *dev_clk;
  64         const struct clk_ops *ops;
  65
  66         debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
  67
  68         assert(clk);
  69         clk->dev = NULL;
  70
  71         ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
  72                                          index, &args);
  73         if (ret) {
  74                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
  75                       __func__, ret);
  76                 return ret;
  77         }
  78
  79         ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
  80         if (ret) {
  81                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
  82                       __func__, ret);
  83                 return ret;
  84         }
  85
  86         clk->dev = dev_clk;
  87
  88         ops = clk_dev_ops(dev_clk);
  89
  90         if (ops->of_xlate)
  91                 ret = ops->of_xlate(clk, &args);
  92         else
  93                 ret = clk_of_xlate_default(clk, &args);
  94         if (ret) {
  95                 debug("of_xlate() failed: %d\n", ret);
  96                 return ret;
  97         }
  98
  99         return clk_request(dev_clk, clk);
 100 }
 101
 102 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
 103 {
 104         return clk_get_by_indexed_prop(dev, "clocks", index, clk);
 105 }
 106
 107 static int clk_set_default_parents(struct udevice *dev)
 108 {
 109         struct clk clk, parent_clk;
 110         int index;
 111         int num_parents;
 112         int ret;
 113
 114         num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents",
 115                                                   "#clock-cells");
 116         if (num_parents < 0) {
 117                 debug("%s: could not read assigned-clock-parents for %p\n",
 118                       __func__, dev);
 119                 return 0;
 120         }
 121
 122         for (index = 0; index < num_parents; index++) {
 123                 ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents",
 124                                               index, &parent_clk);
 125                 if (ret) {
 126                         debug("%s: could not get parent clock %d for %s\n",
 127                               __func__, index, dev_read_name(dev));
 128                         return ret;
 129                 }
 130
 131                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 132                                               index, &clk);
 133                 if (ret) {
 134                         debug("%s: could not get assigned clock %d for %s\n",
 135                               __func__, index, dev_read_name(dev));
 136                         return ret;
 137                 }
 138
 139                 ret = clk_set_parent(&clk, &parent_clk);
 140
 141                 /*
 142                  * Not all drivers may support clock-reparenting (as of now).
 143                  * Ignore errors due to this.
 144                  */
 145                 if (ret == -ENOSYS)
 146                         continue;
 147
 148                 if (ret) {
 149                         debug("%s: failed to reparent clock %d for %s\n",
 150                               __func__, index, dev_read_name(dev));
 151                         return ret;
 152                 }
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int clk_set_default_rates(struct udevice *dev)
 159 {
 160         struct clk clk;
 161         int index;
 162         int num_rates;
 163         int size;
 164         int ret = 0;
 165         u32 *rates = NULL;
 166
 167         size = dev_read_size(dev, "assigned-clock-rates");
 168         if (size < 0)
 169                 return 0;
 170
 171         num_rates = size / sizeof(u32);
 172         rates = calloc(num_rates, sizeof(u32));
 173         if (!rates)
 174                 return -ENOMEM;
 175
 176         ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates);
 177         if (ret)
 178                 goto fail;
 179
 180         for (index = 0; index < num_rates; index++) {
 181                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 182                                               index, &clk);
 183                 if (ret) {
 184                         debug("%s: could not get assigned clock %d for %s\n",
 185                               __func__, index, dev_read_name(dev));
 186                         continue;
 187                 }
 188
 189                 ret = clk_set_rate(&clk, rates[index]);
 190                 if (ret < 0) {
 191                         debug("%s: failed to set rate on clock %d for %s\n",
 192                               __func__, index, dev_read_name(dev));
 193                         break;
 194                 }
 195         }
 196
 197 fail:
 198         free(rates);
 199         return ret;
 200 }
 201
 202 int clk_set_defaults(struct udevice *dev)
 203 {
 204         int ret;
 205
 206         /* If this is running pre-reloc state, don't take any action. */
 207         if (!(gd->flags & GD_FLG_RELOC))
 208                 return 0;
 209
 210         debug("%s(%s)\n", __func__, dev_read_name(dev));
 211
 212         ret = clk_set_default_parents(dev);
 213         if (ret)
 214                 return ret;
 215
 216         ret = clk_set_default_rates(dev);
 217         if (ret < 0)
 218                 return ret;
 219
 220         return 0;
 221 }
 222 # endif /* OF_PLATDATA */
 223
 224 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
 225 {
 226         int index;
 227
 228         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
 229         clk->dev = NULL;
 230
 231         index = dev_read_stringlist_search(dev, "clock-names", name);
 232         if (index < 0) {
 233                 debug("fdt_stringlist_search() failed: %d\n", index);
 234                 return index;
 235         }
 236
 237         return clk_get_by_index(dev, index, clk);
 238 }
 239
 240 int clk_release_all(struct clk *clk, int count)
 241 {
 242         int i, ret;
 243
 244         for (i = 0; i < count; i++) {
 245                 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
 246
 247                 /* check if clock has been previously requested */
 248                 if (!clk[i].dev)
 249                         continue;
 250
 251                 ret = clk_disable(&clk[i]);
 252                 if (ret && ret != -ENOSYS)
 253                         return ret;
 254
 255                 ret = clk_free(&clk[i]);
 256                 if (ret && ret != -ENOSYS)
 257                         return ret;
 258         }
 259
 260         return 0;
 261 }
 262
 263 #endif /* OF_CONTROL */
 264
 265 int clk_request(struct udevice *dev, struct clk *clk)
 266 {
 267         const struct clk_ops *ops = clk_dev_ops(dev);
 268
 269         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
 270
 271         clk->dev = dev;
 272
 273         if (!ops->request)
 274                 return 0;
 275
 276         return ops->request(clk);
 277 }
 278
 279 int clk_free(struct clk *clk)
 280 {
 281         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 282
 283         debug("%s(clk=%p)\n", __func__, clk);
 284
 285         if (!ops->free)
 286                 return 0;
 287
 288         return ops->free(clk);
 289 }
 290
 291 ulong clk_get_rate(struct clk *clk)
 292 {
 293         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 294
 295         debug("%s(clk=%p)\n", __func__, clk);
 296
 297         if (!ops->get_rate)
 298                 return -ENOSYS;
 299
 300         return ops->get_rate(clk);
 301 }
 302
 303 ulong clk_set_rate(struct clk *clk, ulong rate)
 304 {
 305         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 306
 307         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
 308
 309         if (!ops->set_rate)
 310                 return -ENOSYS;
 311
 312         return ops->set_rate(clk, rate);
 313 }
 314
 315 int clk_set_parent(struct clk *clk, struct clk *parent)
 316 {
 317         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 318
 319         debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
 320
 321         if (!ops->set_parent)
 322                 return -ENOSYS;
 323
 324         return ops->set_parent(clk, parent);
 325 }
 326
 327 int clk_enable(struct clk *clk)
 328 {
 329         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 330
 331         debug("%s(clk=%p)\n", __func__, clk);
 332
 333         if (!ops->enable)
 334                 return -ENOSYS;
 335
 336         return ops->enable(clk);
 337 }
 338
 339 int clk_disable(struct clk *clk)
 340 {
 341         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 342
 343         debug("%s(clk=%p)\n", __func__, clk);
 344
 345         if (!ops->disable)
 346                 return -ENOSYS;
 347
 348         return ops->disable(clk);
 349 }
 350
 351 UCLASS_DRIVER(clk) = {
 352         .id             = UCLASS_CLK,
 353         .name           = "clk",
 354 };