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Commit | Line | Data |
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1da177e4 | 1 | /* |
b9158556 | 2 | * linux/arch/arm/plat-omap/clock.c |
1da177e4 | 3 | * |
137b3ee2 | 4 | * Copyright (C) 2004 - 2008 Nokia corporation |
1da177e4 LT |
5 | * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com> |
6 | * | |
1a8bfa1e TL |
7 | * Modified for omap shared clock framework by Tony Lindgren <tony@atomide.com> |
8 | * | |
1da177e4 LT |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2 as | |
11 | * published by the Free Software Foundation. | |
12 | */ | |
1da177e4 | 13 | #include <linux/kernel.h> |
1a8bfa1e TL |
14 | #include <linux/init.h> |
15 | #include <linux/module.h> | |
1da177e4 LT |
16 | #include <linux/list.h> |
17 | #include <linux/errno.h> | |
18 | #include <linux/err.h> | |
4e57b681 | 19 | #include <linux/string.h> |
f8ce2547 | 20 | #include <linux/clk.h> |
00431707 | 21 | #include <linux/mutex.h> |
b824efae | 22 | #include <linux/platform_device.h> |
b851cb28 | 23 | #include <linux/cpufreq.h> |
137b3ee2 | 24 | #include <linux/debugfs.h> |
fced80c7 | 25 | #include <linux/io.h> |
1da177e4 | 26 | |
a09e64fb | 27 | #include <mach/clock.h> |
1da177e4 | 28 | |
7df3450e | 29 | static LIST_HEAD(clocks); |
00431707 | 30 | static DEFINE_MUTEX(clocks_mutex); |
7df3450e | 31 | static DEFINE_SPINLOCK(clockfw_lock); |
1da177e4 | 32 | |
1a8bfa1e | 33 | static struct clk_functions *arch_clock; |
1da177e4 | 34 | |
1a8bfa1e | 35 | /*------------------------------------------------------------------------- |
f07adc59 | 36 | * Standard clock functions defined in include/linux/clk.h |
1a8bfa1e | 37 | *-------------------------------------------------------------------------*/ |
1da177e4 | 38 | |
b824efae TL |
39 | /* |
40 | * Returns a clock. Note that we first try to use device id on the bus | |
41 | * and clock name. If this fails, we try to use clock name only. | |
42 | */ | |
1a8bfa1e | 43 | struct clk * clk_get(struct device *dev, const char *id) |
1da177e4 LT |
44 | { |
45 | struct clk *p, *clk = ERR_PTR(-ENOENT); | |
b824efae TL |
46 | int idno; |
47 | ||
48 | if (dev == NULL || dev->bus != &platform_bus_type) | |
49 | idno = -1; | |
50 | else | |
51 | idno = to_platform_device(dev)->id; | |
1da177e4 | 52 | |
00431707 | 53 | mutex_lock(&clocks_mutex); |
b824efae TL |
54 | |
55 | list_for_each_entry(p, &clocks, node) { | |
eee5b191 | 56 | if (p->id == idno && strcmp(id, p->name) == 0) { |
b824efae | 57 | clk = p; |
67d4d835 | 58 | goto found; |
b824efae TL |
59 | } |
60 | } | |
61 | ||
1da177e4 | 62 | list_for_each_entry(p, &clocks, node) { |
eee5b191 | 63 | if (strcmp(id, p->name) == 0) { |
1da177e4 LT |
64 | clk = p; |
65 | break; | |
66 | } | |
67 | } | |
b824efae | 68 | |
67d4d835 | 69 | found: |
00431707 | 70 | mutex_unlock(&clocks_mutex); |
1da177e4 LT |
71 | |
72 | return clk; | |
73 | } | |
74 | EXPORT_SYMBOL(clk_get); | |
75 | ||
1da177e4 LT |
76 | int clk_enable(struct clk *clk) |
77 | { | |
78 | unsigned long flags; | |
1a8bfa1e | 79 | int ret = 0; |
1da177e4 | 80 | |
b824efae TL |
81 | if (clk == NULL || IS_ERR(clk)) |
82 | return -EINVAL; | |
83 | ||
1da177e4 | 84 | spin_lock_irqsave(&clockfw_lock, flags); |
f07adc59 | 85 | if (arch_clock->clk_enable) |
1a8bfa1e | 86 | ret = arch_clock->clk_enable(clk); |
1da177e4 | 87 | spin_unlock_irqrestore(&clockfw_lock, flags); |
1a8bfa1e | 88 | |
1da177e4 LT |
89 | return ret; |
90 | } | |
91 | EXPORT_SYMBOL(clk_enable); | |
92 | ||
1da177e4 LT |
93 | void clk_disable(struct clk *clk) |
94 | { | |
95 | unsigned long flags; | |
96 | ||
b824efae TL |
97 | if (clk == NULL || IS_ERR(clk)) |
98 | return; | |
99 | ||
1da177e4 | 100 | spin_lock_irqsave(&clockfw_lock, flags); |
7cf95774 TL |
101 | if (clk->usecount == 0) { |
102 | printk(KERN_ERR "Trying disable clock %s with 0 usecount\n", | |
103 | clk->name); | |
104 | WARN_ON(1); | |
105 | goto out; | |
106 | } | |
107 | ||
f07adc59 | 108 | if (arch_clock->clk_disable) |
1a8bfa1e | 109 | arch_clock->clk_disable(clk); |
7cf95774 TL |
110 | |
111 | out: | |
1da177e4 LT |
112 | spin_unlock_irqrestore(&clockfw_lock, flags); |
113 | } | |
114 | EXPORT_SYMBOL(clk_disable); | |
115 | ||
1da177e4 LT |
116 | int clk_get_usecount(struct clk *clk) |
117 | { | |
1a8bfa1e TL |
118 | unsigned long flags; |
119 | int ret = 0; | |
1da177e4 | 120 | |
b824efae TL |
121 | if (clk == NULL || IS_ERR(clk)) |
122 | return 0; | |
123 | ||
1a8bfa1e TL |
124 | spin_lock_irqsave(&clockfw_lock, flags); |
125 | ret = clk->usecount; | |
126 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
1da177e4 | 127 | |
1a8bfa1e | 128 | return ret; |
1da177e4 | 129 | } |
1a8bfa1e | 130 | EXPORT_SYMBOL(clk_get_usecount); |
1da177e4 | 131 | |
1a8bfa1e | 132 | unsigned long clk_get_rate(struct clk *clk) |
1da177e4 | 133 | { |
1a8bfa1e TL |
134 | unsigned long flags; |
135 | unsigned long ret = 0; | |
1da177e4 | 136 | |
b824efae TL |
137 | if (clk == NULL || IS_ERR(clk)) |
138 | return 0; | |
139 | ||
1a8bfa1e TL |
140 | spin_lock_irqsave(&clockfw_lock, flags); |
141 | ret = clk->rate; | |
142 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
1da177e4 | 143 | |
1a8bfa1e | 144 | return ret; |
1da177e4 | 145 | } |
1a8bfa1e | 146 | EXPORT_SYMBOL(clk_get_rate); |
1da177e4 | 147 | |
1a8bfa1e | 148 | void clk_put(struct clk *clk) |
bb13b5fd | 149 | { |
bb13b5fd | 150 | } |
1a8bfa1e | 151 | EXPORT_SYMBOL(clk_put); |
bb13b5fd | 152 | |
1a8bfa1e | 153 | /*------------------------------------------------------------------------- |
f07adc59 | 154 | * Optional clock functions defined in include/linux/clk.h |
1a8bfa1e | 155 | *-------------------------------------------------------------------------*/ |
bb13b5fd | 156 | |
1da177e4 LT |
157 | long clk_round_rate(struct clk *clk, unsigned long rate) |
158 | { | |
1a8bfa1e TL |
159 | unsigned long flags; |
160 | long ret = 0; | |
1da177e4 | 161 | |
b824efae TL |
162 | if (clk == NULL || IS_ERR(clk)) |
163 | return ret; | |
164 | ||
1a8bfa1e TL |
165 | spin_lock_irqsave(&clockfw_lock, flags); |
166 | if (arch_clock->clk_round_rate) | |
167 | ret = arch_clock->clk_round_rate(clk, rate); | |
168 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
1da177e4 | 169 | |
1a8bfa1e | 170 | return ret; |
1da177e4 LT |
171 | } |
172 | EXPORT_SYMBOL(clk_round_rate); | |
173 | ||
1a8bfa1e | 174 | int clk_set_rate(struct clk *clk, unsigned long rate) |
1da177e4 | 175 | { |
1a8bfa1e | 176 | unsigned long flags; |
b824efae TL |
177 | int ret = -EINVAL; |
178 | ||
179 | if (clk == NULL || IS_ERR(clk)) | |
180 | return ret; | |
bb13b5fd | 181 | |
1a8bfa1e TL |
182 | spin_lock_irqsave(&clockfw_lock, flags); |
183 | if (arch_clock->clk_set_rate) | |
184 | ret = arch_clock->clk_set_rate(clk, rate); | |
c6af4508 RK |
185 | if (ret == 0 && (clk->flags & RATE_PROPAGATES)) |
186 | propagate_rate(clk); | |
1a8bfa1e | 187 | spin_unlock_irqrestore(&clockfw_lock, flags); |
1da177e4 | 188 | |
1a8bfa1e | 189 | return ret; |
1da177e4 | 190 | } |
1a8bfa1e | 191 | EXPORT_SYMBOL(clk_set_rate); |
1da177e4 | 192 | |
1a8bfa1e | 193 | int clk_set_parent(struct clk *clk, struct clk *parent) |
1da177e4 | 194 | { |
1a8bfa1e | 195 | unsigned long flags; |
b824efae TL |
196 | int ret = -EINVAL; |
197 | ||
198 | if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent)) | |
199 | return ret; | |
1da177e4 | 200 | |
1a8bfa1e TL |
201 | spin_lock_irqsave(&clockfw_lock, flags); |
202 | if (arch_clock->clk_set_parent) | |
c6af4508 RK |
203 | ret = arch_clock->clk_set_parent(clk, parent); |
204 | if (ret == 0 && (clk->flags & RATE_PROPAGATES)) | |
205 | propagate_rate(clk); | |
1a8bfa1e | 206 | spin_unlock_irqrestore(&clockfw_lock, flags); |
1da177e4 | 207 | |
1a8bfa1e | 208 | return ret; |
1da177e4 | 209 | } |
1a8bfa1e | 210 | EXPORT_SYMBOL(clk_set_parent); |
1da177e4 | 211 | |
1a8bfa1e | 212 | struct clk *clk_get_parent(struct clk *clk) |
1da177e4 | 213 | { |
2e777bf1 | 214 | return clk->parent; |
1da177e4 | 215 | } |
1a8bfa1e | 216 | EXPORT_SYMBOL(clk_get_parent); |
1da177e4 | 217 | |
1a8bfa1e TL |
218 | /*------------------------------------------------------------------------- |
219 | * OMAP specific clock functions shared between omap1 and omap2 | |
220 | *-------------------------------------------------------------------------*/ | |
1da177e4 | 221 | |
1a8bfa1e | 222 | unsigned int __initdata mpurate; |
1da177e4 | 223 | |
1a8bfa1e TL |
224 | /* |
225 | * By default we use the rate set by the bootloader. | |
226 | * You can override this with mpurate= cmdline option. | |
227 | */ | |
228 | static int __init omap_clk_setup(char *str) | |
1da177e4 | 229 | { |
1a8bfa1e | 230 | get_option(&str, &mpurate); |
1da177e4 | 231 | |
1a8bfa1e TL |
232 | if (!mpurate) |
233 | return 1; | |
1da177e4 | 234 | |
1a8bfa1e TL |
235 | if (mpurate < 1000) |
236 | mpurate *= 1000000; | |
1da177e4 | 237 | |
1a8bfa1e | 238 | return 1; |
1da177e4 | 239 | } |
1a8bfa1e | 240 | __setup("mpurate=", omap_clk_setup); |
1da177e4 | 241 | |
1a8bfa1e TL |
242 | /* Used for clocks that always have same value as the parent clock */ |
243 | void followparent_recalc(struct clk *clk) | |
1da177e4 | 244 | { |
b824efae TL |
245 | if (clk == NULL || IS_ERR(clk)) |
246 | return; | |
247 | ||
1a8bfa1e | 248 | clk->rate = clk->parent->rate; |
1da177e4 LT |
249 | } |
250 | ||
1a8bfa1e TL |
251 | /* Propagate rate to children */ |
252 | void propagate_rate(struct clk * tclk) | |
1da177e4 | 253 | { |
1a8bfa1e | 254 | struct clk *clkp; |
1da177e4 | 255 | |
b824efae TL |
256 | if (tclk == NULL || IS_ERR(tclk)) |
257 | return; | |
258 | ||
1a8bfa1e TL |
259 | list_for_each_entry(clkp, &clocks, node) { |
260 | if (likely(clkp->parent != tclk)) | |
261 | continue; | |
9a5fedac | 262 | if (clkp->recalc) |
1a8bfa1e | 263 | clkp->recalc(clkp); |
9a5fedac RK |
264 | if (clkp->flags & RATE_PROPAGATES) |
265 | propagate_rate(clkp); | |
1a8bfa1e | 266 | } |
1da177e4 LT |
267 | } |
268 | ||
6b8858a9 PW |
269 | /** |
270 | * recalculate_root_clocks - recalculate and propagate all root clocks | |
271 | * | |
272 | * Recalculates all root clocks (clocks with no parent), which if the | |
273 | * clock's .recalc is set correctly, should also propagate their rates. | |
274 | * Called at init. | |
275 | */ | |
276 | void recalculate_root_clocks(void) | |
277 | { | |
278 | struct clk *clkp; | |
279 | ||
280 | list_for_each_entry(clkp, &clocks, node) { | |
9a5fedac RK |
281 | if (!clkp->parent) { |
282 | if (clkp->recalc) | |
283 | clkp->recalc(clkp); | |
284 | if (clkp->flags & RATE_PROPAGATES) | |
285 | propagate_rate(clkp); | |
286 | } | |
6b8858a9 PW |
287 | } |
288 | } | |
289 | ||
1da177e4 LT |
290 | int clk_register(struct clk *clk) |
291 | { | |
b824efae TL |
292 | if (clk == NULL || IS_ERR(clk)) |
293 | return -EINVAL; | |
294 | ||
dbb674d5 RK |
295 | /* |
296 | * trap out already registered clocks | |
297 | */ | |
298 | if (clk->node.next || clk->node.prev) | |
299 | return 0; | |
300 | ||
00431707 | 301 | mutex_lock(&clocks_mutex); |
1da177e4 LT |
302 | list_add(&clk->node, &clocks); |
303 | if (clk->init) | |
304 | clk->init(clk); | |
00431707 | 305 | mutex_unlock(&clocks_mutex); |
1a8bfa1e | 306 | |
1da177e4 LT |
307 | return 0; |
308 | } | |
309 | EXPORT_SYMBOL(clk_register); | |
310 | ||
311 | void clk_unregister(struct clk *clk) | |
312 | { | |
b824efae TL |
313 | if (clk == NULL || IS_ERR(clk)) |
314 | return; | |
315 | ||
00431707 | 316 | mutex_lock(&clocks_mutex); |
1da177e4 | 317 | list_del(&clk->node); |
00431707 | 318 | mutex_unlock(&clocks_mutex); |
1da177e4 LT |
319 | } |
320 | EXPORT_SYMBOL(clk_unregister); | |
321 | ||
6b8858a9 PW |
322 | void clk_enable_init_clocks(void) |
323 | { | |
324 | struct clk *clkp; | |
325 | ||
326 | list_for_each_entry(clkp, &clocks, node) { | |
327 | if (clkp->flags & ENABLE_ON_INIT) | |
328 | clk_enable(clkp); | |
329 | } | |
330 | } | |
331 | EXPORT_SYMBOL(clk_enable_init_clocks); | |
332 | ||
897dcded RK |
333 | /* |
334 | * Low level helpers | |
335 | */ | |
336 | static int clkll_enable_null(struct clk *clk) | |
337 | { | |
338 | return 0; | |
339 | } | |
340 | ||
341 | static void clkll_disable_null(struct clk *clk) | |
342 | { | |
343 | } | |
344 | ||
345 | const struct clkops clkops_null = { | |
346 | .enable = clkll_enable_null, | |
347 | .disable = clkll_disable_null, | |
348 | }; | |
349 | ||
6b8858a9 PW |
350 | #ifdef CONFIG_CPU_FREQ |
351 | void clk_init_cpufreq_table(struct cpufreq_frequency_table **table) | |
352 | { | |
353 | unsigned long flags; | |
354 | ||
355 | spin_lock_irqsave(&clockfw_lock, flags); | |
356 | if (arch_clock->clk_init_cpufreq_table) | |
357 | arch_clock->clk_init_cpufreq_table(table); | |
358 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
359 | } | |
360 | EXPORT_SYMBOL(clk_init_cpufreq_table); | |
361 | #endif | |
362 | ||
1a8bfa1e | 363 | /*-------------------------------------------------------------------------*/ |
bb13b5fd | 364 | |
90afd5cb TL |
365 | #ifdef CONFIG_OMAP_RESET_CLOCKS |
366 | /* | |
367 | * Disable any unused clocks left on by the bootloader | |
368 | */ | |
369 | static int __init clk_disable_unused(void) | |
370 | { | |
371 | struct clk *ck; | |
372 | unsigned long flags; | |
373 | ||
374 | list_for_each_entry(ck, &clocks, node) { | |
897dcded RK |
375 | if (ck->ops == &clkops_null) |
376 | continue; | |
377 | ||
378 | if (ck->usecount > 0 || ck->enable_reg == 0) | |
90afd5cb TL |
379 | continue; |
380 | ||
381 | spin_lock_irqsave(&clockfw_lock, flags); | |
382 | if (arch_clock->clk_disable_unused) | |
383 | arch_clock->clk_disable_unused(ck); | |
384 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
385 | } | |
386 | ||
387 | return 0; | |
388 | } | |
389 | late_initcall(clk_disable_unused); | |
390 | #endif | |
391 | ||
1a8bfa1e | 392 | int __init clk_init(struct clk_functions * custom_clocks) |
bb13b5fd | 393 | { |
1a8bfa1e TL |
394 | if (!custom_clocks) { |
395 | printk(KERN_ERR "No custom clock functions registered\n"); | |
396 | BUG(); | |
bb13b5fd TL |
397 | } |
398 | ||
1a8bfa1e TL |
399 | arch_clock = custom_clocks; |
400 | ||
bb13b5fd TL |
401 | return 0; |
402 | } | |
6b8858a9 | 403 | |
137b3ee2 HD |
404 | #if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) |
405 | /* | |
406 | * debugfs support to trace clock tree hierarchy and attributes | |
407 | */ | |
408 | static struct dentry *clk_debugfs_root; | |
409 | ||
410 | static int clk_debugfs_register_one(struct clk *c) | |
411 | { | |
412 | int err; | |
413 | struct dentry *d, *child; | |
414 | struct clk *pa = c->parent; | |
415 | char s[255]; | |
416 | char *p = s; | |
417 | ||
418 | p += sprintf(p, "%s", c->name); | |
419 | if (c->id != 0) | |
420 | sprintf(p, ":%d", c->id); | |
421 | d = debugfs_create_dir(s, pa ? pa->dent : clk_debugfs_root); | |
e621f266 Z |
422 | if (!d) |
423 | return -ENOMEM; | |
137b3ee2 HD |
424 | c->dent = d; |
425 | ||
426 | d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usecount); | |
e621f266 Z |
427 | if (!d) { |
428 | err = -ENOMEM; | |
137b3ee2 HD |
429 | goto err_out; |
430 | } | |
431 | d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate); | |
e621f266 Z |
432 | if (!d) { |
433 | err = -ENOMEM; | |
137b3ee2 HD |
434 | goto err_out; |
435 | } | |
436 | d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags); | |
e621f266 Z |
437 | if (!d) { |
438 | err = -ENOMEM; | |
137b3ee2 HD |
439 | goto err_out; |
440 | } | |
441 | return 0; | |
442 | ||
443 | err_out: | |
444 | d = c->dent; | |
445 | list_for_each_entry(child, &d->d_subdirs, d_u.d_child) | |
446 | debugfs_remove(child); | |
447 | debugfs_remove(c->dent); | |
448 | return err; | |
449 | } | |
450 | ||
451 | static int clk_debugfs_register(struct clk *c) | |
452 | { | |
453 | int err; | |
454 | struct clk *pa = c->parent; | |
455 | ||
456 | if (pa && !pa->dent) { | |
457 | err = clk_debugfs_register(pa); | |
458 | if (err) | |
459 | return err; | |
460 | } | |
461 | ||
462 | if (!c->dent) { | |
463 | err = clk_debugfs_register_one(c); | |
464 | if (err) | |
465 | return err; | |
466 | } | |
467 | return 0; | |
468 | } | |
469 | ||
470 | static int __init clk_debugfs_init(void) | |
471 | { | |
472 | struct clk *c; | |
473 | struct dentry *d; | |
474 | int err; | |
475 | ||
476 | d = debugfs_create_dir("clock", NULL); | |
e621f266 Z |
477 | if (!d) |
478 | return -ENOMEM; | |
137b3ee2 HD |
479 | clk_debugfs_root = d; |
480 | ||
481 | list_for_each_entry(c, &clocks, node) { | |
482 | err = clk_debugfs_register(c); | |
483 | if (err) | |
484 | goto err_out; | |
485 | } | |
486 | return 0; | |
487 | err_out: | |
488 | debugfs_remove(clk_debugfs_root); /* REVISIT: Cleanup correctly */ | |
489 | return err; | |
490 | } | |
491 | late_initcall(clk_debugfs_init); | |
492 | ||
493 | #endif /* defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) */ |