git.sur5r.net Git - u-boot/blob - drivers/clk/clk-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Google, Inc
   4  * Written by Simon Glass <sjg@chromium.org>
   5  * Copyright (c) 2016, NVIDIA CORPORATION.
   6  * Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH
   7  */
   8
   9 #include <common.h>
  10 #include <clk.h>
  11 #include <clk-uclass.h>
  12 #include <dm.h>
  13 #include <dm/read.h>
  14 #include <dt-structs.h>
  15 #include <errno.h>
  16
  17 static inline const struct clk_ops *clk_dev_ops(struct udevice *dev)
  18 {
  19         return (const struct clk_ops *)dev->driver->ops;
  20 }
  21
  22 #if CONFIG_IS_ENABLED(OF_CONTROL)
  23 # if CONFIG_IS_ENABLED(OF_PLATDATA)
  24 int clk_get_by_index_platdata(struct udevice *dev, int index,
  25                               struct phandle_1_arg *cells, struct clk *clk)
  26 {
  27         int ret;
  28
  29         if (index != 0)
  30                 return -ENOSYS;
  31         ret = uclass_get_device(UCLASS_CLK, 0, &clk->dev);
  32         if (ret)
  33                 return ret;
  34         clk->id = cells[0].arg[0];
  35
  36         return 0;
  37 }
  38 # else
  39 static int clk_of_xlate_default(struct clk *clk,
  40                                 struct ofnode_phandle_args *args)
  41 {
  42         debug("%s(clk=%p)\n", __func__, clk);
  43
  44         if (args->args_count > 1) {
  45                 debug("Invaild args_count: %d\n", args->args_count);
  46                 return -EINVAL;
  47         }
  48
  49         if (args->args_count)
  50                 clk->id = args->args[0];
  51         else
  52                 clk->id = 0;
  53
  54         return 0;
  55 }
  56
  57 static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name,
  58                                    int index, struct clk *clk)
  59 {
  60         int ret;
  61         struct ofnode_phandle_args args;
  62         struct udevice *dev_clk;
  63         const struct clk_ops *ops;
  64
  65         debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk);
  66
  67         assert(clk);
  68         clk->dev = NULL;
  69
  70         ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0,
  71                                          index, &args);
  72         if (ret) {
  73                 debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
  74                       __func__, ret);
  75                 return ret;
  76         }
  77
  78         ret = uclass_get_device_by_ofnode(UCLASS_CLK, args.node, &dev_clk);
  79         if (ret) {
  80                 debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
  81                       __func__, ret);
  82                 return ret;
  83         }
  84
  85         clk->dev = dev_clk;
  86
  87         ops = clk_dev_ops(dev_clk);
  88
  89         if (ops->of_xlate)
  90                 ret = ops->of_xlate(clk, &args);
  91         else
  92                 ret = clk_of_xlate_default(clk, &args);
  93         if (ret) {
  94                 debug("of_xlate() failed: %d\n", ret);
  95                 return ret;
  96         }
  97
  98         return clk_request(dev_clk, clk);
  99 }
 100
 101 int clk_get_by_index(struct udevice *dev, int index, struct clk *clk)
 102 {
 103         return clk_get_by_indexed_prop(dev, "clocks", index, clk);
 104 }
 105
 106 int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
 107 {
 108         int i, ret, err, count;
 109
 110         bulk->count = 0;
 111
 112         count = dev_count_phandle_with_args(dev, "clocks", "#clock-cells");
 113         if (count < 1)
 114                 return count;
 115
 116         bulk->clks = devm_kcalloc(dev, count, sizeof(struct clk), GFP_KERNEL);
 117         if (!bulk->clks)
 118                 return -ENOMEM;
 119
 120         for (i = 0; i < count; i++) {
 121                 ret = clk_get_by_index(dev, i, &bulk->clks[i]);
 122                 if (ret < 0)
 123                         goto bulk_get_err;
 124
 125                 ++bulk->count;
 126         }
 127
 128         return 0;
 129
 130 bulk_get_err:
 131         err = clk_release_all(bulk->clks, bulk->count);
 132         if (err)
 133                 debug("%s: could release all clocks for %p\n",
 134                       __func__, dev);
 135
 136         return ret;
 137 }
 138
 139 static int clk_set_default_parents(struct udevice *dev)
 140 {
 141         struct clk clk, parent_clk;
 142         int index;
 143         int num_parents;
 144         int ret;
 145
 146         num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents",
 147                                                   "#clock-cells");
 148         if (num_parents < 0) {
 149                 debug("%s: could not read assigned-clock-parents for %p\n",
 150                       __func__, dev);
 151                 return 0;
 152         }
 153
 154         for (index = 0; index < num_parents; index++) {
 155                 ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents",
 156                                               index, &parent_clk);
 157                 if (ret) {
 158                         debug("%s: could not get parent clock %d for %s\n",
 159                               __func__, index, dev_read_name(dev));
 160                         return ret;
 161                 }
 162
 163                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 164                                               index, &clk);
 165                 if (ret) {
 166                         debug("%s: could not get assigned clock %d for %s\n",
 167                               __func__, index, dev_read_name(dev));
 168                         return ret;
 169                 }
 170
 171                 ret = clk_set_parent(&clk, &parent_clk);
 172
 173                 /*
 174                  * Not all drivers may support clock-reparenting (as of now).
 175                  * Ignore errors due to this.
 176                  */
 177                 if (ret == -ENOSYS)
 178                         continue;
 179
 180                 if (ret) {
 181                         debug("%s: failed to reparent clock %d for %s\n",
 182                               __func__, index, dev_read_name(dev));
 183                         return ret;
 184                 }
 185         }
 186
 187         return 0;
 188 }
 189
 190 static int clk_set_default_rates(struct udevice *dev)
 191 {
 192         struct clk clk;
 193         int index;
 194         int num_rates;
 195         int size;
 196         int ret = 0;
 197         u32 *rates = NULL;
 198
 199         size = dev_read_size(dev, "assigned-clock-rates");
 200         if (size < 0)
 201                 return 0;
 202
 203         num_rates = size / sizeof(u32);
 204         rates = calloc(num_rates, sizeof(u32));
 205         if (!rates)
 206                 return -ENOMEM;
 207
 208         ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates);
 209         if (ret)
 210                 goto fail;
 211
 212         for (index = 0; index < num_rates; index++) {
 213                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 214                                               index, &clk);
 215                 if (ret) {
 216                         debug("%s: could not get assigned clock %d for %s\n",
 217                               __func__, index, dev_read_name(dev));
 218                         continue;
 219                 }
 220
 221                 ret = clk_set_rate(&clk, rates[index]);
 222                 if (ret < 0) {
 223                         debug("%s: failed to set rate on clock %d for %s\n",
 224                               __func__, index, dev_read_name(dev));
 225                         break;
 226                 }
 227         }
 228
 229 fail:
 230         free(rates);
 231         return ret;
 232 }
 233
 234 int clk_set_defaults(struct udevice *dev)
 235 {
 236         int ret;
 237
 238         /* If this is running pre-reloc state, don't take any action. */
 239         if (!(gd->flags & GD_FLG_RELOC))
 240                 return 0;
 241
 242         debug("%s(%s)\n", __func__, dev_read_name(dev));
 243
 244         ret = clk_set_default_parents(dev);
 245         if (ret)
 246                 return ret;
 247
 248         ret = clk_set_default_rates(dev);
 249         if (ret < 0)
 250                 return ret;
 251
 252         return 0;
 253 }
 254 # endif /* OF_PLATDATA */
 255
 256 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
 257 {
 258         int index;
 259
 260         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
 261         clk->dev = NULL;
 262
 263         index = dev_read_stringlist_search(dev, "clock-names", name);
 264         if (index < 0) {
 265                 debug("fdt_stringlist_search() failed: %d\n", index);
 266                 return index;
 267         }
 268
 269         return clk_get_by_index(dev, index, clk);
 270 }
 271
 272 int clk_release_all(struct clk *clk, int count)
 273 {
 274         int i, ret;
 275
 276         for (i = 0; i < count; i++) {
 277                 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
 278
 279                 /* check if clock has been previously requested */
 280                 if (!clk[i].dev)
 281                         continue;
 282
 283                 ret = clk_disable(&clk[i]);
 284                 if (ret && ret != -ENOSYS)
 285                         return ret;
 286
 287                 ret = clk_free(&clk[i]);
 288                 if (ret && ret != -ENOSYS)
 289                         return ret;
 290         }
 291
 292         return 0;
 293 }
 294
 295 #endif /* OF_CONTROL */
 296
 297 int clk_request(struct udevice *dev, struct clk *clk)
 298 {
 299         const struct clk_ops *ops = clk_dev_ops(dev);
 300
 301         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
 302
 303         clk->dev = dev;
 304
 305         if (!ops->request)
 306                 return 0;
 307
 308         return ops->request(clk);
 309 }
 310
 311 int clk_free(struct clk *clk)
 312 {
 313         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 314
 315         debug("%s(clk=%p)\n", __func__, clk);
 316
 317         if (!ops->free)
 318                 return 0;
 319
 320         return ops->free(clk);
 321 }
 322
 323 ulong clk_get_rate(struct clk *clk)
 324 {
 325         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 326
 327         debug("%s(clk=%p)\n", __func__, clk);
 328
 329         if (!ops->get_rate)
 330                 return -ENOSYS;
 331
 332         return ops->get_rate(clk);
 333 }
 334
 335 ulong clk_set_rate(struct clk *clk, ulong rate)
 336 {
 337         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 338
 339         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
 340
 341         if (!ops->set_rate)
 342                 return -ENOSYS;
 343
 344         return ops->set_rate(clk, rate);
 345 }
 346
 347 int clk_set_parent(struct clk *clk, struct clk *parent)
 348 {
 349         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 350
 351         debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
 352
 353         if (!ops->set_parent)
 354                 return -ENOSYS;
 355
 356         return ops->set_parent(clk, parent);
 357 }
 358
 359 int clk_enable(struct clk *clk)
 360 {
 361         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 362
 363         debug("%s(clk=%p)\n", __func__, clk);
 364
 365         if (!ops->enable)
 366                 return -ENOSYS;
 367
 368         return ops->enable(clk);
 369 }
 370
 371 int clk_enable_bulk(struct clk_bulk *bulk)
 372 {
 373         int i, ret;
 374
 375         for (i = 0; i < bulk->count; i++) {
 376                 ret = clk_enable(&bulk->clks[i]);
 377                 if (ret < 0 && ret != -ENOSYS)
 378                         return ret;
 379         }
 380
 381         return 0;
 382 }
 383
 384 int clk_disable(struct clk *clk)
 385 {
 386         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 387
 388         debug("%s(clk=%p)\n", __func__, clk);
 389
 390         if (!ops->disable)
 391                 return -ENOSYS;
 392
 393         return ops->disable(clk);
 394 }
 395
 396 int clk_disable_bulk(struct clk_bulk *bulk)
 397 {
 398         int i, ret;
 399
 400         for (i = 0; i < bulk->count; i++) {
 401                 ret = clk_disable(&bulk->clks[i]);
 402                 if (ret < 0 && ret != -ENOSYS)
 403                         return ret;
 404         }
 405
 406         return 0;
 407 }
 408
 409 UCLASS_DRIVER(clk) = {
 410         .id             = UCLASS_CLK,
 411         .name           = "clk",
 412 };