Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 1 | /* |
Paul Mundt | de9186c | 2010-10-18 21:32:58 +0900 | [diff] [blame] | 2 | * SuperH clock framework |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 3 | * |
Paul Mundt | 960bc36 | 2010-08-20 19:10:38 +0900 | [diff] [blame] | 4 | * Copyright (C) 2005 - 2010 Paul Mundt |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 5 | * |
| 6 | * This clock framework is derived from the OMAP version by: |
| 7 | * |
| 8 | * Copyright (C) 2004 - 2008 Nokia Corporation |
| 9 | * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com> |
| 10 | * |
| 11 | * Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com> |
| 12 | * |
| 13 | * This file is subject to the terms and conditions of the GNU General Public |
| 14 | * License. See the file "COPYING" in the main directory of this archive |
| 15 | * for more details. |
| 16 | */ |
Paul Mundt | 550a1ef | 2010-10-13 19:24:55 +0900 | [diff] [blame] | 17 | #define pr_fmt(fmt) "clock: " fmt |
| 18 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 19 | #include <linux/kernel.h> |
| 20 | #include <linux/init.h> |
| 21 | #include <linux/module.h> |
| 22 | #include <linux/mutex.h> |
| 23 | #include <linux/list.h> |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 24 | #include <linux/syscore_ops.h> |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 25 | #include <linux/seq_file.h> |
| 26 | #include <linux/err.h> |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 27 | #include <linux/io.h> |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 28 | #include <linux/cpufreq.h> |
| 29 | #include <linux/clk.h> |
| 30 | #include <linux/sh_clk.h> |
| 31 | |
| 32 | static LIST_HEAD(clock_list); |
| 33 | static DEFINE_SPINLOCK(clock_lock); |
| 34 | static DEFINE_MUTEX(clock_list_sem); |
| 35 | |
Magnus Damm | 794d78f | 2011-06-21 07:55:12 +0000 | [diff] [blame] | 36 | /* clock disable operations are not passed on to hardware during boot */ |
| 37 | static int allow_disable; |
| 38 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 39 | void clk_rate_table_build(struct clk *clk, |
| 40 | struct cpufreq_frequency_table *freq_table, |
| 41 | int nr_freqs, |
| 42 | struct clk_div_mult_table *src_table, |
| 43 | unsigned long *bitmap) |
| 44 | { |
| 45 | unsigned long mult, div; |
| 46 | unsigned long freq; |
| 47 | int i; |
| 48 | |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 49 | clk->nr_freqs = nr_freqs; |
| 50 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 51 | for (i = 0; i < nr_freqs; i++) { |
| 52 | div = 1; |
| 53 | mult = 1; |
| 54 | |
| 55 | if (src_table->divisors && i < src_table->nr_divisors) |
| 56 | div = src_table->divisors[i]; |
| 57 | |
| 58 | if (src_table->multipliers && i < src_table->nr_multipliers) |
| 59 | mult = src_table->multipliers[i]; |
| 60 | |
| 61 | if (!div || !mult || (bitmap && !test_bit(i, bitmap))) |
| 62 | freq = CPUFREQ_ENTRY_INVALID; |
| 63 | else |
| 64 | freq = clk->parent->rate * mult / div; |
| 65 | |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 66 | freq_table[i].driver_data = i; |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 67 | freq_table[i].frequency = freq; |
| 68 | } |
| 69 | |
| 70 | /* Termination entry */ |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 71 | freq_table[i].driver_data = i; |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 72 | freq_table[i].frequency = CPUFREQ_TABLE_END; |
| 73 | } |
| 74 | |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 75 | struct clk_rate_round_data; |
| 76 | |
| 77 | struct clk_rate_round_data { |
| 78 | unsigned long rate; |
| 79 | unsigned int min, max; |
Paul Mundt | 8e122db | 2010-10-15 18:33:24 +0900 | [diff] [blame] | 80 | long (*func)(unsigned int, struct clk_rate_round_data *); |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 81 | void *arg; |
| 82 | }; |
| 83 | |
| 84 | #define for_each_frequency(pos, r, freq) \ |
Paul Mundt | e5690e0 | 2010-10-16 00:51:05 +0900 | [diff] [blame] | 85 | for (pos = r->min, freq = r->func(pos, r); \ |
Kuninori Morimoto | c2590f4 | 2010-10-18 03:50:29 +0000 | [diff] [blame] | 86 | pos <= r->max; pos++, freq = r->func(pos, r)) \ |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 87 | if (unlikely(freq == 0)) \ |
| 88 | ; \ |
| 89 | else |
| 90 | |
| 91 | static long clk_rate_round_helper(struct clk_rate_round_data *rounder) |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 92 | { |
| 93 | unsigned long rate_error, rate_error_prev = ~0UL; |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 94 | unsigned long highest, lowest, freq; |
Paul Mundt | 5aefa34 | 2010-11-01 15:30:31 -0400 | [diff] [blame] | 95 | long rate_best_fit = -ENOENT; |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 96 | int i; |
| 97 | |
Paul Mundt | 960bc36 | 2010-08-20 19:10:38 +0900 | [diff] [blame] | 98 | highest = 0; |
| 99 | lowest = ~0UL; |
| 100 | |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 101 | for_each_frequency(i, rounder, freq) { |
Paul Mundt | 960bc36 | 2010-08-20 19:10:38 +0900 | [diff] [blame] | 102 | if (freq > highest) |
| 103 | highest = freq; |
| 104 | if (freq < lowest) |
| 105 | lowest = freq; |
| 106 | |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 107 | rate_error = abs(freq - rounder->rate); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 108 | if (rate_error < rate_error_prev) { |
| 109 | rate_best_fit = freq; |
| 110 | rate_error_prev = rate_error; |
| 111 | } |
| 112 | |
| 113 | if (rate_error == 0) |
| 114 | break; |
| 115 | } |
| 116 | |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 117 | if (rounder->rate >= highest) |
Paul Mundt | 960bc36 | 2010-08-20 19:10:38 +0900 | [diff] [blame] | 118 | rate_best_fit = highest; |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 119 | if (rounder->rate <= lowest) |
Paul Mundt | 960bc36 | 2010-08-20 19:10:38 +0900 | [diff] [blame] | 120 | rate_best_fit = lowest; |
| 121 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 122 | return rate_best_fit; |
| 123 | } |
| 124 | |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 125 | static long clk_rate_table_iter(unsigned int pos, |
| 126 | struct clk_rate_round_data *rounder) |
| 127 | { |
| 128 | struct cpufreq_frequency_table *freq_table = rounder->arg; |
| 129 | unsigned long freq = freq_table[pos].frequency; |
| 130 | |
| 131 | if (freq == CPUFREQ_ENTRY_INVALID) |
| 132 | freq = 0; |
| 133 | |
| 134 | return freq; |
| 135 | } |
| 136 | |
| 137 | long clk_rate_table_round(struct clk *clk, |
| 138 | struct cpufreq_frequency_table *freq_table, |
| 139 | unsigned long rate) |
| 140 | { |
| 141 | struct clk_rate_round_data table_round = { |
| 142 | .min = 0, |
Kuninori Morimoto | c2590f4 | 2010-10-18 03:50:29 +0000 | [diff] [blame] | 143 | .max = clk->nr_freqs - 1, |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 144 | .func = clk_rate_table_iter, |
| 145 | .arg = freq_table, |
| 146 | .rate = rate, |
| 147 | }; |
| 148 | |
Kuninori Morimoto | c2590f4 | 2010-10-18 03:50:29 +0000 | [diff] [blame] | 149 | if (clk->nr_freqs < 1) |
Paul Mundt | 5aefa34 | 2010-11-01 15:30:31 -0400 | [diff] [blame] | 150 | return -ENOSYS; |
Kuninori Morimoto | c2590f4 | 2010-10-18 03:50:29 +0000 | [diff] [blame] | 151 | |
Paul Mundt | f586903 | 2010-10-15 18:17:35 +0900 | [diff] [blame] | 152 | return clk_rate_round_helper(&table_round); |
| 153 | } |
| 154 | |
Paul Mundt | 8e122db | 2010-10-15 18:33:24 +0900 | [diff] [blame] | 155 | static long clk_rate_div_range_iter(unsigned int pos, |
| 156 | struct clk_rate_round_data *rounder) |
| 157 | { |
| 158 | return clk_get_rate(rounder->arg) / pos; |
| 159 | } |
| 160 | |
| 161 | long clk_rate_div_range_round(struct clk *clk, unsigned int div_min, |
| 162 | unsigned int div_max, unsigned long rate) |
| 163 | { |
| 164 | struct clk_rate_round_data div_range_round = { |
| 165 | .min = div_min, |
| 166 | .max = div_max, |
| 167 | .func = clk_rate_div_range_iter, |
| 168 | .arg = clk_get_parent(clk), |
| 169 | .rate = rate, |
| 170 | }; |
| 171 | |
| 172 | return clk_rate_round_helper(&div_range_round); |
| 173 | } |
| 174 | |
Kuninori Morimoto | dd2c0ca | 2011-09-19 18:51:13 -0700 | [diff] [blame] | 175 | static long clk_rate_mult_range_iter(unsigned int pos, |
| 176 | struct clk_rate_round_data *rounder) |
| 177 | { |
| 178 | return clk_get_rate(rounder->arg) * pos; |
| 179 | } |
| 180 | |
| 181 | long clk_rate_mult_range_round(struct clk *clk, unsigned int mult_min, |
| 182 | unsigned int mult_max, unsigned long rate) |
| 183 | { |
| 184 | struct clk_rate_round_data mult_range_round = { |
| 185 | .min = mult_min, |
| 186 | .max = mult_max, |
| 187 | .func = clk_rate_mult_range_iter, |
| 188 | .arg = clk_get_parent(clk), |
| 189 | .rate = rate, |
| 190 | }; |
| 191 | |
| 192 | return clk_rate_round_helper(&mult_range_round); |
| 193 | } |
| 194 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 195 | int clk_rate_table_find(struct clk *clk, |
| 196 | struct cpufreq_frequency_table *freq_table, |
| 197 | unsigned long rate) |
| 198 | { |
| 199 | int i; |
| 200 | |
| 201 | for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) { |
| 202 | unsigned long freq = freq_table[i].frequency; |
| 203 | |
| 204 | if (freq == CPUFREQ_ENTRY_INVALID) |
| 205 | continue; |
| 206 | |
| 207 | if (freq == rate) |
| 208 | return i; |
| 209 | } |
| 210 | |
| 211 | return -ENOENT; |
| 212 | } |
| 213 | |
| 214 | /* Used for clocks that always have same value as the parent clock */ |
| 215 | unsigned long followparent_recalc(struct clk *clk) |
| 216 | { |
| 217 | return clk->parent ? clk->parent->rate : 0; |
| 218 | } |
| 219 | |
| 220 | int clk_reparent(struct clk *child, struct clk *parent) |
| 221 | { |
| 222 | list_del_init(&child->sibling); |
| 223 | if (parent) |
| 224 | list_add(&child->sibling, &parent->children); |
| 225 | child->parent = parent; |
| 226 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | /* Propagate rate to children */ |
| 231 | void propagate_rate(struct clk *tclk) |
| 232 | { |
| 233 | struct clk *clkp; |
| 234 | |
| 235 | list_for_each_entry(clkp, &tclk->children, sibling) { |
| 236 | if (clkp->ops && clkp->ops->recalc) |
| 237 | clkp->rate = clkp->ops->recalc(clkp); |
| 238 | |
| 239 | propagate_rate(clkp); |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | static void __clk_disable(struct clk *clk) |
| 244 | { |
Magnus Damm | 6939539 | 2010-10-13 07:44:36 +0000 | [diff] [blame] | 245 | if (WARN(!clk->usecount, "Trying to disable clock %p with 0 usecount\n", |
| 246 | clk)) |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 247 | return; |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 248 | |
| 249 | if (!(--clk->usecount)) { |
Magnus Damm | 794d78f | 2011-06-21 07:55:12 +0000 | [diff] [blame] | 250 | if (likely(allow_disable && clk->ops && clk->ops->disable)) |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 251 | clk->ops->disable(clk); |
| 252 | if (likely(clk->parent)) |
| 253 | __clk_disable(clk->parent); |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | void clk_disable(struct clk *clk) |
| 258 | { |
| 259 | unsigned long flags; |
| 260 | |
| 261 | if (!clk) |
| 262 | return; |
| 263 | |
| 264 | spin_lock_irqsave(&clock_lock, flags); |
| 265 | __clk_disable(clk); |
| 266 | spin_unlock_irqrestore(&clock_lock, flags); |
| 267 | } |
| 268 | EXPORT_SYMBOL_GPL(clk_disable); |
| 269 | |
| 270 | static int __clk_enable(struct clk *clk) |
| 271 | { |
| 272 | int ret = 0; |
| 273 | |
| 274 | if (clk->usecount++ == 0) { |
| 275 | if (clk->parent) { |
| 276 | ret = __clk_enable(clk->parent); |
| 277 | if (unlikely(ret)) |
| 278 | goto err; |
| 279 | } |
| 280 | |
| 281 | if (clk->ops && clk->ops->enable) { |
| 282 | ret = clk->ops->enable(clk); |
| 283 | if (ret) { |
| 284 | if (clk->parent) |
| 285 | __clk_disable(clk->parent); |
| 286 | goto err; |
| 287 | } |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | return ret; |
| 292 | err: |
| 293 | clk->usecount--; |
| 294 | return ret; |
| 295 | } |
| 296 | |
| 297 | int clk_enable(struct clk *clk) |
| 298 | { |
| 299 | unsigned long flags; |
| 300 | int ret; |
| 301 | |
| 302 | if (!clk) |
| 303 | return -EINVAL; |
| 304 | |
| 305 | spin_lock_irqsave(&clock_lock, flags); |
| 306 | ret = __clk_enable(clk); |
| 307 | spin_unlock_irqrestore(&clock_lock, flags); |
| 308 | |
| 309 | return ret; |
| 310 | } |
| 311 | EXPORT_SYMBOL_GPL(clk_enable); |
| 312 | |
| 313 | static LIST_HEAD(root_clks); |
| 314 | |
| 315 | /** |
| 316 | * recalculate_root_clocks - recalculate and propagate all root clocks |
| 317 | * |
| 318 | * Recalculates all root clocks (clocks with no parent), which if the |
| 319 | * clock's .recalc is set correctly, should also propagate their rates. |
| 320 | * Called at init. |
| 321 | */ |
| 322 | void recalculate_root_clocks(void) |
| 323 | { |
| 324 | struct clk *clkp; |
| 325 | |
| 326 | list_for_each_entry(clkp, &root_clks, sibling) { |
| 327 | if (clkp->ops && clkp->ops->recalc) |
| 328 | clkp->rate = clkp->ops->recalc(clkp); |
| 329 | propagate_rate(clkp); |
| 330 | } |
| 331 | } |
| 332 | |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 333 | static struct clk_mapping dummy_mapping; |
| 334 | |
| 335 | static struct clk *lookup_root_clock(struct clk *clk) |
| 336 | { |
| 337 | while (clk->parent) |
| 338 | clk = clk->parent; |
| 339 | |
| 340 | return clk; |
| 341 | } |
| 342 | |
| 343 | static int clk_establish_mapping(struct clk *clk) |
| 344 | { |
| 345 | struct clk_mapping *mapping = clk->mapping; |
| 346 | |
| 347 | /* |
| 348 | * Propagate mappings. |
| 349 | */ |
| 350 | if (!mapping) { |
| 351 | struct clk *clkp; |
| 352 | |
| 353 | /* |
| 354 | * dummy mapping for root clocks with no specified ranges |
| 355 | */ |
| 356 | if (!clk->parent) { |
| 357 | clk->mapping = &dummy_mapping; |
Magnus Damm | eda2030 | 2011-12-08 22:58:54 +0900 | [diff] [blame] | 358 | goto out; |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 359 | } |
| 360 | |
| 361 | /* |
| 362 | * If we're on a child clock and it provides no mapping of its |
| 363 | * own, inherit the mapping from its root clock. |
| 364 | */ |
| 365 | clkp = lookup_root_clock(clk); |
| 366 | mapping = clkp->mapping; |
| 367 | BUG_ON(!mapping); |
| 368 | } |
| 369 | |
| 370 | /* |
| 371 | * Establish initial mapping. |
| 372 | */ |
| 373 | if (!mapping->base && mapping->phys) { |
| 374 | kref_init(&mapping->ref); |
| 375 | |
| 376 | mapping->base = ioremap_nocache(mapping->phys, mapping->len); |
| 377 | if (unlikely(!mapping->base)) |
| 378 | return -ENXIO; |
| 379 | } else if (mapping->base) { |
| 380 | /* |
| 381 | * Bump the refcount for an existing mapping |
| 382 | */ |
| 383 | kref_get(&mapping->ref); |
| 384 | } |
| 385 | |
| 386 | clk->mapping = mapping; |
Magnus Damm | eda2030 | 2011-12-08 22:58:54 +0900 | [diff] [blame] | 387 | out: |
| 388 | clk->mapped_reg = clk->mapping->base; |
| 389 | clk->mapped_reg += (phys_addr_t)clk->enable_reg - clk->mapping->phys; |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | static void clk_destroy_mapping(struct kref *kref) |
| 394 | { |
| 395 | struct clk_mapping *mapping; |
| 396 | |
| 397 | mapping = container_of(kref, struct clk_mapping, ref); |
| 398 | |
| 399 | iounmap(mapping->base); |
| 400 | } |
| 401 | |
| 402 | static void clk_teardown_mapping(struct clk *clk) |
| 403 | { |
| 404 | struct clk_mapping *mapping = clk->mapping; |
| 405 | |
| 406 | /* Nothing to do */ |
| 407 | if (mapping == &dummy_mapping) |
Magnus Damm | eda2030 | 2011-12-08 22:58:54 +0900 | [diff] [blame] | 408 | goto out; |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 409 | |
| 410 | kref_put(&mapping->ref, clk_destroy_mapping); |
| 411 | clk->mapping = NULL; |
Magnus Damm | eda2030 | 2011-12-08 22:58:54 +0900 | [diff] [blame] | 412 | out: |
| 413 | clk->mapped_reg = NULL; |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 414 | } |
| 415 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 416 | int clk_register(struct clk *clk) |
| 417 | { |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 418 | int ret; |
| 419 | |
Paul Mundt | 225ca45 | 2011-06-24 17:35:40 +0900 | [diff] [blame] | 420 | if (IS_ERR_OR_NULL(clk)) |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 421 | return -EINVAL; |
| 422 | |
| 423 | /* |
| 424 | * trap out already registered clocks |
| 425 | */ |
| 426 | if (clk->node.next || clk->node.prev) |
| 427 | return 0; |
| 428 | |
| 429 | mutex_lock(&clock_list_sem); |
| 430 | |
| 431 | INIT_LIST_HEAD(&clk->children); |
| 432 | clk->usecount = 0; |
| 433 | |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 434 | ret = clk_establish_mapping(clk); |
| 435 | if (unlikely(ret)) |
| 436 | goto out_unlock; |
| 437 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 438 | if (clk->parent) |
| 439 | list_add(&clk->sibling, &clk->parent->children); |
| 440 | else |
| 441 | list_add(&clk->sibling, &root_clks); |
| 442 | |
| 443 | list_add(&clk->node, &clock_list); |
Paul Mundt | f278ea8 | 2010-11-19 16:40:35 +0900 | [diff] [blame] | 444 | |
| 445 | #ifdef CONFIG_SH_CLK_CPG_LEGACY |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 446 | if (clk->ops && clk->ops->init) |
| 447 | clk->ops->init(clk); |
Paul Mundt | f278ea8 | 2010-11-19 16:40:35 +0900 | [diff] [blame] | 448 | #endif |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 449 | |
| 450 | out_unlock: |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 451 | mutex_unlock(&clock_list_sem); |
| 452 | |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 453 | return ret; |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 454 | } |
| 455 | EXPORT_SYMBOL_GPL(clk_register); |
| 456 | |
| 457 | void clk_unregister(struct clk *clk) |
| 458 | { |
| 459 | mutex_lock(&clock_list_sem); |
| 460 | list_del(&clk->sibling); |
| 461 | list_del(&clk->node); |
Paul Mundt | 28085bc | 2010-10-15 16:46:37 +0900 | [diff] [blame] | 462 | clk_teardown_mapping(clk); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 463 | mutex_unlock(&clock_list_sem); |
| 464 | } |
| 465 | EXPORT_SYMBOL_GPL(clk_unregister); |
| 466 | |
| 467 | void clk_enable_init_clocks(void) |
| 468 | { |
| 469 | struct clk *clkp; |
| 470 | |
| 471 | list_for_each_entry(clkp, &clock_list, node) |
| 472 | if (clkp->flags & CLK_ENABLE_ON_INIT) |
| 473 | clk_enable(clkp); |
| 474 | } |
| 475 | |
| 476 | unsigned long clk_get_rate(struct clk *clk) |
| 477 | { |
| 478 | return clk->rate; |
| 479 | } |
| 480 | EXPORT_SYMBOL_GPL(clk_get_rate); |
| 481 | |
| 482 | int clk_set_rate(struct clk *clk, unsigned long rate) |
| 483 | { |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 484 | int ret = -EOPNOTSUPP; |
| 485 | unsigned long flags; |
| 486 | |
| 487 | spin_lock_irqsave(&clock_lock, flags); |
| 488 | |
| 489 | if (likely(clk->ops && clk->ops->set_rate)) { |
Paul Mundt | 35a96c7 | 2010-11-15 18:18:32 +0900 | [diff] [blame] | 490 | ret = clk->ops->set_rate(clk, rate); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 491 | if (ret != 0) |
| 492 | goto out_unlock; |
| 493 | } else { |
| 494 | clk->rate = rate; |
| 495 | ret = 0; |
| 496 | } |
| 497 | |
| 498 | if (clk->ops && clk->ops->recalc) |
| 499 | clk->rate = clk->ops->recalc(clk); |
| 500 | |
| 501 | propagate_rate(clk); |
| 502 | |
| 503 | out_unlock: |
| 504 | spin_unlock_irqrestore(&clock_lock, flags); |
| 505 | |
| 506 | return ret; |
| 507 | } |
Paul Mundt | 9a1683d | 2010-11-15 18:14:43 +0900 | [diff] [blame] | 508 | EXPORT_SYMBOL_GPL(clk_set_rate); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 509 | |
| 510 | int clk_set_parent(struct clk *clk, struct clk *parent) |
| 511 | { |
| 512 | unsigned long flags; |
| 513 | int ret = -EINVAL; |
| 514 | |
| 515 | if (!parent || !clk) |
| 516 | return ret; |
| 517 | if (clk->parent == parent) |
| 518 | return 0; |
| 519 | |
| 520 | spin_lock_irqsave(&clock_lock, flags); |
| 521 | if (clk->usecount == 0) { |
| 522 | if (clk->ops->set_parent) |
| 523 | ret = clk->ops->set_parent(clk, parent); |
| 524 | else |
| 525 | ret = clk_reparent(clk, parent); |
| 526 | |
| 527 | if (ret == 0) { |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 528 | if (clk->ops->recalc) |
| 529 | clk->rate = clk->ops->recalc(clk); |
Paul Mundt | 550a1ef | 2010-10-13 19:24:55 +0900 | [diff] [blame] | 530 | pr_debug("set parent of %p to %p (new rate %ld)\n", |
Magnus Damm | 6939539 | 2010-10-13 07:44:36 +0000 | [diff] [blame] | 531 | clk, clk->parent, clk->rate); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 532 | propagate_rate(clk); |
| 533 | } |
| 534 | } else |
| 535 | ret = -EBUSY; |
| 536 | spin_unlock_irqrestore(&clock_lock, flags); |
| 537 | |
| 538 | return ret; |
| 539 | } |
| 540 | EXPORT_SYMBOL_GPL(clk_set_parent); |
| 541 | |
| 542 | struct clk *clk_get_parent(struct clk *clk) |
| 543 | { |
| 544 | return clk->parent; |
| 545 | } |
| 546 | EXPORT_SYMBOL_GPL(clk_get_parent); |
| 547 | |
| 548 | long clk_round_rate(struct clk *clk, unsigned long rate) |
| 549 | { |
| 550 | if (likely(clk->ops && clk->ops->round_rate)) { |
| 551 | unsigned long flags, rounded; |
| 552 | |
| 553 | spin_lock_irqsave(&clock_lock, flags); |
| 554 | rounded = clk->ops->round_rate(clk, rate); |
| 555 | spin_unlock_irqrestore(&clock_lock, flags); |
| 556 | |
| 557 | return rounded; |
| 558 | } |
| 559 | |
| 560 | return clk_get_rate(clk); |
| 561 | } |
| 562 | EXPORT_SYMBOL_GPL(clk_round_rate); |
| 563 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 564 | long clk_round_parent(struct clk *clk, unsigned long target, |
| 565 | unsigned long *best_freq, unsigned long *parent_freq, |
| 566 | unsigned int div_min, unsigned int div_max) |
| 567 | { |
| 568 | struct cpufreq_frequency_table *freq, *best = NULL; |
| 569 | unsigned long error = ULONG_MAX, freq_high, freq_low, div; |
| 570 | struct clk *parent = clk_get_parent(clk); |
| 571 | |
| 572 | if (!parent) { |
| 573 | *parent_freq = 0; |
| 574 | *best_freq = clk_round_rate(clk, target); |
| 575 | return abs(target - *best_freq); |
| 576 | } |
| 577 | |
| 578 | for (freq = parent->freq_table; freq->frequency != CPUFREQ_TABLE_END; |
| 579 | freq++) { |
| 580 | if (freq->frequency == CPUFREQ_ENTRY_INVALID) |
| 581 | continue; |
| 582 | |
| 583 | if (unlikely(freq->frequency / target <= div_min - 1)) { |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 584 | unsigned long freq_max; |
| 585 | |
| 586 | freq_max = (freq->frequency + div_min / 2) / div_min; |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 587 | if (error > target - freq_max) { |
| 588 | error = target - freq_max; |
| 589 | best = freq; |
| 590 | if (best_freq) |
| 591 | *best_freq = freq_max; |
| 592 | } |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 593 | |
Paul Mundt | ed10b49 | 2010-11-10 18:02:25 +0900 | [diff] [blame] | 594 | pr_debug("too low freq %u, error %lu\n", freq->frequency, |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 595 | target - freq_max); |
| 596 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 597 | if (!error) |
| 598 | break; |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 599 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 600 | continue; |
| 601 | } |
| 602 | |
| 603 | if (unlikely(freq->frequency / target >= div_max)) { |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 604 | unsigned long freq_min; |
| 605 | |
| 606 | freq_min = (freq->frequency + div_max / 2) / div_max; |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 607 | if (error > freq_min - target) { |
| 608 | error = freq_min - target; |
| 609 | best = freq; |
| 610 | if (best_freq) |
| 611 | *best_freq = freq_min; |
| 612 | } |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 613 | |
Paul Mundt | ed10b49 | 2010-11-10 18:02:25 +0900 | [diff] [blame] | 614 | pr_debug("too high freq %u, error %lu\n", freq->frequency, |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 615 | freq_min - target); |
| 616 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 617 | if (!error) |
| 618 | break; |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 619 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 620 | continue; |
| 621 | } |
| 622 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 623 | div = freq->frequency / target; |
| 624 | freq_high = freq->frequency / div; |
| 625 | freq_low = freq->frequency / (div + 1); |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 626 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 627 | if (freq_high - target < error) { |
| 628 | error = freq_high - target; |
| 629 | best = freq; |
| 630 | if (best_freq) |
| 631 | *best_freq = freq_high; |
| 632 | } |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 633 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 634 | if (target - freq_low < error) { |
| 635 | error = target - freq_low; |
| 636 | best = freq; |
| 637 | if (best_freq) |
| 638 | *best_freq = freq_low; |
| 639 | } |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 640 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 641 | pr_debug("%u / %lu = %lu, / %lu = %lu, best %lu, parent %u\n", |
| 642 | freq->frequency, div, freq_high, div + 1, freq_low, |
| 643 | *best_freq, best->frequency); |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 644 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 645 | if (!error) |
| 646 | break; |
| 647 | } |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 648 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 649 | if (parent_freq) |
| 650 | *parent_freq = best->frequency; |
Paul Mundt | a766b29 | 2010-11-08 09:40:23 +0900 | [diff] [blame] | 651 | |
Guennadi Liakhovetski | 6af26c6 | 2010-11-02 11:27:24 +0000 | [diff] [blame] | 652 | return error; |
| 653 | } |
| 654 | EXPORT_SYMBOL_GPL(clk_round_parent); |
| 655 | |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 656 | #ifdef CONFIG_PM |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 657 | static void clks_core_resume(void) |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 658 | { |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 659 | struct clk *clkp; |
| 660 | |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 661 | list_for_each_entry(clkp, &clock_list, node) { |
Magnus Damm | 583af25 | 2011-06-13 04:42:15 +0000 | [diff] [blame] | 662 | if (likely(clkp->usecount && clkp->ops)) { |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 663 | unsigned long rate = clkp->rate; |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 664 | |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 665 | if (likely(clkp->ops->set_parent)) |
| 666 | clkp->ops->set_parent(clkp, |
| 667 | clkp->parent); |
| 668 | if (likely(clkp->ops->set_rate)) |
| 669 | clkp->ops->set_rate(clkp, rate); |
| 670 | else if (likely(clkp->ops->recalc)) |
| 671 | clkp->rate = clkp->ops->recalc(clkp); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 672 | } |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 673 | } |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 674 | } |
| 675 | |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 676 | static struct syscore_ops clks_syscore_ops = { |
| 677 | .resume = clks_core_resume, |
| 678 | }; |
| 679 | |
| 680 | static int __init clk_syscore_init(void) |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 681 | { |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 682 | register_syscore_ops(&clks_syscore_ops); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 683 | |
| 684 | return 0; |
| 685 | } |
Rafael J. Wysocki | a696b89 | 2011-03-22 20:19:28 +0000 | [diff] [blame] | 686 | subsys_initcall(clk_syscore_init); |
Magnus Damm | 8b5ee11 | 2010-05-11 13:29:25 +0000 | [diff] [blame] | 687 | #endif |
| 688 | |
Magnus Damm | 794d78f | 2011-06-21 07:55:12 +0000 | [diff] [blame] | 689 | static int __init clk_late_init(void) |
| 690 | { |
| 691 | unsigned long flags; |
| 692 | struct clk *clk; |
| 693 | |
| 694 | /* disable all clocks with zero use count */ |
| 695 | mutex_lock(&clock_list_sem); |
| 696 | spin_lock_irqsave(&clock_lock, flags); |
| 697 | |
| 698 | list_for_each_entry(clk, &clock_list, node) |
| 699 | if (!clk->usecount && clk->ops && clk->ops->disable) |
| 700 | clk->ops->disable(clk); |
| 701 | |
| 702 | /* from now on allow clock disable operations */ |
| 703 | allow_disable = 1; |
| 704 | |
| 705 | spin_unlock_irqrestore(&clock_lock, flags); |
| 706 | mutex_unlock(&clock_list_sem); |
| 707 | return 0; |
| 708 | } |
| 709 | late_initcall(clk_late_init); |