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 -ENOENT, this is a no-op entry */
 158                 if (ret == -ENOENT)
 159                         continue;
 160
 161                 if (ret) {
 162                         debug("%s: could not get parent clock %d for %s\n",
 163                               __func__, index, dev_read_name(dev));
 164                         return ret;
 165                 }
 166
 167                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 168                                               index, &clk);
 169                 if (ret) {
 170                         debug("%s: could not get assigned clock %d for %s\n",
 171                               __func__, index, dev_read_name(dev));
 172                         return ret;
 173                 }
 174
 175                 ret = clk_set_parent(&clk, &parent_clk);
 176
 177                 /*
 178                  * Not all drivers may support clock-reparenting (as of now).
 179                  * Ignore errors due to this.
 180                  */
 181                 if (ret == -ENOSYS)
 182                         continue;
 183
 184                 if (ret) {
 185                         debug("%s: failed to reparent clock %d for %s\n",
 186                               __func__, index, dev_read_name(dev));
 187                         return ret;
 188                 }
 189         }
 190
 191         return 0;
 192 }
 193
 194 static int clk_set_default_rates(struct udevice *dev)
 195 {
 196         struct clk clk;
 197         int index;
 198         int num_rates;
 199         int size;
 200         int ret = 0;
 201         u32 *rates = NULL;
 202
 203         size = dev_read_size(dev, "assigned-clock-rates");
 204         if (size < 0)
 205                 return 0;
 206
 207         num_rates = size / sizeof(u32);
 208         rates = calloc(num_rates, sizeof(u32));
 209         if (!rates)
 210                 return -ENOMEM;
 211
 212         ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates);
 213         if (ret)
 214                 goto fail;
 215
 216         for (index = 0; index < num_rates; index++) {
 217                 /* If 0 is passed, this is a no-op */
 218                 if (!rates[index])
 219                         continue;
 220
 221                 ret = clk_get_by_indexed_prop(dev, "assigned-clocks",
 222                                               index, &clk);
 223                 if (ret) {
 224                         debug("%s: could not get assigned clock %d for %s\n",
 225                               __func__, index, dev_read_name(dev));
 226                         continue;
 227                 }
 228
 229                 ret = clk_set_rate(&clk, rates[index]);
 230                 if (ret < 0) {
 231                         debug("%s: failed to set rate on clock %d for %s\n",
 232                               __func__, index, dev_read_name(dev));
 233                         break;
 234                 }
 235         }
 236
 237 fail:
 238         free(rates);
 239         return ret;
 240 }
 241
 242 int clk_set_defaults(struct udevice *dev)
 243 {
 244         int ret;
 245
 246         debug("%s(%s)\n", __func__, dev_read_name(dev));
 247
 248         ret = clk_set_default_parents(dev);
 249         if (ret)
 250                 return ret;
 251
 252         ret = clk_set_default_rates(dev);
 253         if (ret < 0)
 254                 return ret;
 255
 256         return 0;
 257 }
 258 # endif /* OF_PLATDATA */
 259
 260 int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk)
 261 {
 262         int index;
 263
 264         debug("%s(dev=%p, name=%s, clk=%p)\n", __func__, dev, name, clk);
 265         clk->dev = NULL;
 266
 267         index = dev_read_stringlist_search(dev, "clock-names", name);
 268         if (index < 0) {
 269                 debug("fdt_stringlist_search() failed: %d\n", index);
 270                 return index;
 271         }
 272
 273         return clk_get_by_index(dev, index, clk);
 274 }
 275
 276 int clk_release_all(struct clk *clk, int count)
 277 {
 278         int i, ret;
 279
 280         for (i = 0; i < count; i++) {
 281                 debug("%s(clk[%d]=%p)\n", __func__, i, &clk[i]);
 282
 283                 /* check if clock has been previously requested */
 284                 if (!clk[i].dev)
 285                         continue;
 286
 287                 ret = clk_disable(&clk[i]);
 288                 if (ret && ret != -ENOSYS)
 289                         return ret;
 290
 291                 ret = clk_free(&clk[i]);
 292                 if (ret && ret != -ENOSYS)
 293                         return ret;
 294         }
 295
 296         return 0;
 297 }
 298
 299 #endif /* OF_CONTROL */
 300
 301 int clk_request(struct udevice *dev, struct clk *clk)
 302 {
 303         const struct clk_ops *ops = clk_dev_ops(dev);
 304
 305         debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk);
 306
 307         clk->dev = dev;
 308
 309         if (!ops->request)
 310                 return 0;
 311
 312         return ops->request(clk);
 313 }
 314
 315 int clk_free(struct clk *clk)
 316 {
 317         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 318
 319         debug("%s(clk=%p)\n", __func__, clk);
 320
 321         if (!ops->free)
 322                 return 0;
 323
 324         return ops->free(clk);
 325 }
 326
 327 ulong clk_get_rate(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->get_rate)
 334                 return -ENOSYS;
 335
 336         return ops->get_rate(clk);
 337 }
 338
 339 ulong clk_set_rate(struct clk *clk, ulong rate)
 340 {
 341         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 342
 343         debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
 344
 345         if (!ops->set_rate)
 346                 return -ENOSYS;
 347
 348         return ops->set_rate(clk, rate);
 349 }
 350
 351 int clk_set_parent(struct clk *clk, struct clk *parent)
 352 {
 353         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 354
 355         debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
 356
 357         if (!ops->set_parent)
 358                 return -ENOSYS;
 359
 360         return ops->set_parent(clk, parent);
 361 }
 362
 363 int clk_enable(struct clk *clk)
 364 {
 365         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 366
 367         debug("%s(clk=%p)\n", __func__, clk);
 368
 369         if (!ops->enable)
 370                 return -ENOSYS;
 371
 372         return ops->enable(clk);
 373 }
 374
 375 int clk_enable_bulk(struct clk_bulk *bulk)
 376 {
 377         int i, ret;
 378
 379         for (i = 0; i < bulk->count; i++) {
 380                 ret = clk_enable(&bulk->clks[i]);
 381                 if (ret < 0 && ret != -ENOSYS)
 382                         return ret;
 383         }
 384
 385         return 0;
 386 }
 387
 388 int clk_disable(struct clk *clk)
 389 {
 390         const struct clk_ops *ops = clk_dev_ops(clk->dev);
 391
 392         debug("%s(clk=%p)\n", __func__, clk);
 393
 394         if (!ops->disable)
 395                 return -ENOSYS;
 396
 397         return ops->disable(clk);
 398 }
 399
 400 int clk_disable_bulk(struct clk_bulk *bulk)
 401 {
 402         int i, ret;
 403
 404         for (i = 0; i < bulk->count; i++) {
 405                 ret = clk_disable(&bulk->clks[i]);
 406                 if (ret < 0 && ret != -ENOSYS)
 407                         return ret;
 408         }
 409
 410         return 0;
 411 }
 412
 413 UCLASS_DRIVER(clk) = {
 414         .id             = UCLASS_CLK,
 415         .name           = "clk",
 416 };