Commit | Line | Data |
---|---|---|
3e062b07 | 1 | /* |
c5b736d0 | 2 | * Clock and PLL control for DaVinci devices |
3e062b07 | 3 | * |
c5b736d0 KH |
4 | * Copyright (C) 2006-2007 Texas Instruments. |
5 | * Copyright (C) 2008-2009 Deep Root Systems, LLC | |
3e062b07 VB |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | ||
13 | #include <linux/module.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/errno.h> | |
c5b736d0 | 17 | #include <linux/clk.h> |
3e062b07 VB |
18 | #include <linux/err.h> |
19 | #include <linux/mutex.h> | |
fced80c7 | 20 | #include <linux/io.h> |
d6a61563 | 21 | #include <linux/delay.h> |
3e062b07 | 22 | |
a09e64fb | 23 | #include <mach/hardware.h> |
3e062b07 | 24 | |
28552c2e | 25 | #include <mach/clock.h> |
a09e64fb | 26 | #include <mach/psc.h> |
c5b736d0 | 27 | #include <mach/cputype.h> |
3e062b07 VB |
28 | #include "clock.h" |
29 | ||
3e062b07 VB |
30 | static LIST_HEAD(clocks); |
31 | static DEFINE_MUTEX(clocks_mutex); | |
32 | static DEFINE_SPINLOCK(clockfw_lock); | |
33 | ||
c5b736d0 | 34 | static unsigned psc_domain(struct clk *clk) |
3e062b07 | 35 | { |
c5b736d0 KH |
36 | return (clk->flags & PSC_DSP) |
37 | ? DAVINCI_GPSC_DSPDOMAIN | |
38 | : DAVINCI_GPSC_ARMDOMAIN; | |
3e062b07 | 39 | } |
3e062b07 | 40 | |
c5b736d0 | 41 | static void __clk_enable(struct clk *clk) |
3e062b07 | 42 | { |
c5b736d0 KH |
43 | if (clk->parent) |
44 | __clk_enable(clk->parent); | |
45 | if (clk->usecount++ == 0 && (clk->flags & CLK_PSC)) | |
52958be3 CC |
46 | davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, |
47 | PSC_STATE_ENABLE); | |
3e062b07 VB |
48 | } |
49 | ||
50 | static void __clk_disable(struct clk *clk) | |
51 | { | |
c5b736d0 | 52 | if (WARN_ON(clk->usecount == 0)) |
3e062b07 | 53 | return; |
679f9218 C |
54 | if (--clk->usecount == 0 && !(clk->flags & CLK_PLL) && |
55 | (clk->flags & CLK_PSC)) | |
52958be3 CC |
56 | davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, |
57 | (clk->flags & PSC_SWRSTDISABLE) ? | |
58 | PSC_STATE_SWRSTDISABLE : PSC_STATE_DISABLE); | |
c5b736d0 KH |
59 | if (clk->parent) |
60 | __clk_disable(clk->parent); | |
3e062b07 VB |
61 | } |
62 | ||
63 | int clk_enable(struct clk *clk) | |
64 | { | |
65 | unsigned long flags; | |
3e062b07 VB |
66 | |
67 | if (clk == NULL || IS_ERR(clk)) | |
68 | return -EINVAL; | |
69 | ||
c5b736d0 KH |
70 | spin_lock_irqsave(&clockfw_lock, flags); |
71 | __clk_enable(clk); | |
72 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
3e062b07 | 73 | |
c5b736d0 | 74 | return 0; |
3e062b07 VB |
75 | } |
76 | EXPORT_SYMBOL(clk_enable); | |
77 | ||
78 | void clk_disable(struct clk *clk) | |
79 | { | |
80 | unsigned long flags; | |
81 | ||
82 | if (clk == NULL || IS_ERR(clk)) | |
83 | return; | |
84 | ||
c5b736d0 KH |
85 | spin_lock_irqsave(&clockfw_lock, flags); |
86 | __clk_disable(clk); | |
87 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
3e062b07 VB |
88 | } |
89 | EXPORT_SYMBOL(clk_disable); | |
90 | ||
91 | unsigned long clk_get_rate(struct clk *clk) | |
92 | { | |
93 | if (clk == NULL || IS_ERR(clk)) | |
94 | return -EINVAL; | |
95 | ||
c5b736d0 | 96 | return clk->rate; |
3e062b07 VB |
97 | } |
98 | EXPORT_SYMBOL(clk_get_rate); | |
99 | ||
100 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
101 | { | |
102 | if (clk == NULL || IS_ERR(clk)) | |
103 | return -EINVAL; | |
104 | ||
d6a61563 SN |
105 | if (clk->round_rate) |
106 | return clk->round_rate(clk, rate); | |
107 | ||
c5b736d0 | 108 | return clk->rate; |
3e062b07 VB |
109 | } |
110 | EXPORT_SYMBOL(clk_round_rate); | |
111 | ||
d6a61563 SN |
112 | /* Propagate rate to children */ |
113 | static void propagate_rate(struct clk *root) | |
114 | { | |
115 | struct clk *clk; | |
116 | ||
117 | list_for_each_entry(clk, &root->children, childnode) { | |
118 | if (clk->recalc) | |
119 | clk->rate = clk->recalc(clk); | |
120 | propagate_rate(clk); | |
121 | } | |
122 | } | |
123 | ||
3e062b07 VB |
124 | int clk_set_rate(struct clk *clk, unsigned long rate) |
125 | { | |
d6a61563 SN |
126 | unsigned long flags; |
127 | int ret = -EINVAL; | |
128 | ||
3e062b07 | 129 | if (clk == NULL || IS_ERR(clk)) |
d6a61563 SN |
130 | return ret; |
131 | ||
d6a61563 SN |
132 | if (clk->set_rate) |
133 | ret = clk->set_rate(clk, rate); | |
3b43cd6f SN |
134 | |
135 | spin_lock_irqsave(&clockfw_lock, flags); | |
d6a61563 SN |
136 | if (ret == 0) { |
137 | if (clk->recalc) | |
138 | clk->rate = clk->recalc(clk); | |
139 | propagate_rate(clk); | |
140 | } | |
141 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
3e062b07 | 142 | |
d6a61563 | 143 | return ret; |
3e062b07 VB |
144 | } |
145 | EXPORT_SYMBOL(clk_set_rate); | |
146 | ||
b82a51e8 SN |
147 | int clk_set_parent(struct clk *clk, struct clk *parent) |
148 | { | |
149 | unsigned long flags; | |
150 | ||
151 | if (clk == NULL || IS_ERR(clk)) | |
152 | return -EINVAL; | |
153 | ||
154 | /* Cannot change parent on enabled clock */ | |
155 | if (WARN_ON(clk->usecount)) | |
156 | return -EINVAL; | |
157 | ||
158 | mutex_lock(&clocks_mutex); | |
159 | clk->parent = parent; | |
160 | list_del_init(&clk->childnode); | |
161 | list_add(&clk->childnode, &clk->parent->children); | |
162 | mutex_unlock(&clocks_mutex); | |
163 | ||
164 | spin_lock_irqsave(&clockfw_lock, flags); | |
165 | if (clk->recalc) | |
166 | clk->rate = clk->recalc(clk); | |
167 | propagate_rate(clk); | |
168 | spin_unlock_irqrestore(&clockfw_lock, flags); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | EXPORT_SYMBOL(clk_set_parent); | |
173 | ||
3e062b07 VB |
174 | int clk_register(struct clk *clk) |
175 | { | |
176 | if (clk == NULL || IS_ERR(clk)) | |
177 | return -EINVAL; | |
178 | ||
c5b736d0 KH |
179 | if (WARN(clk->parent && !clk->parent->rate, |
180 | "CLK: %s parent %s has no rate!\n", | |
181 | clk->name, clk->parent->name)) | |
182 | return -EINVAL; | |
183 | ||
f02bf3b3 SN |
184 | INIT_LIST_HEAD(&clk->children); |
185 | ||
3e062b07 | 186 | mutex_lock(&clocks_mutex); |
c5b736d0 | 187 | list_add_tail(&clk->node, &clocks); |
f02bf3b3 SN |
188 | if (clk->parent) |
189 | list_add_tail(&clk->childnode, &clk->parent->children); | |
3e062b07 VB |
190 | mutex_unlock(&clocks_mutex); |
191 | ||
c5b736d0 KH |
192 | /* If rate is already set, use it */ |
193 | if (clk->rate) | |
194 | return 0; | |
195 | ||
de381a91 SN |
196 | /* Else, see if there is a way to calculate it */ |
197 | if (clk->recalc) | |
198 | clk->rate = clk->recalc(clk); | |
199 | ||
c5b736d0 | 200 | /* Otherwise, default to parent rate */ |
de381a91 | 201 | else if (clk->parent) |
c5b736d0 KH |
202 | clk->rate = clk->parent->rate; |
203 | ||
3e062b07 VB |
204 | return 0; |
205 | } | |
206 | EXPORT_SYMBOL(clk_register); | |
207 | ||
208 | void clk_unregister(struct clk *clk) | |
209 | { | |
210 | if (clk == NULL || IS_ERR(clk)) | |
211 | return; | |
212 | ||
213 | mutex_lock(&clocks_mutex); | |
214 | list_del(&clk->node); | |
f02bf3b3 | 215 | list_del(&clk->childnode); |
3e062b07 VB |
216 | mutex_unlock(&clocks_mutex); |
217 | } | |
218 | EXPORT_SYMBOL(clk_unregister); | |
219 | ||
c5b736d0 KH |
220 | #ifdef CONFIG_DAVINCI_RESET_CLOCKS |
221 | /* | |
222 | * Disable any unused clocks left on by the bootloader | |
223 | */ | |
224 | static int __init clk_disable_unused(void) | |
225 | { | |
226 | struct clk *ck; | |
227 | ||
228 | spin_lock_irq(&clockfw_lock); | |
229 | list_for_each_entry(ck, &clocks, node) { | |
230 | if (ck->usecount > 0) | |
231 | continue; | |
232 | if (!(ck->flags & CLK_PSC)) | |
233 | continue; | |
234 | ||
235 | /* ignore if in Disabled or SwRstDisable states */ | |
789a785e | 236 | if (!davinci_psc_is_clk_active(ck->gpsc, ck->lpsc)) |
c5b736d0 KH |
237 | continue; |
238 | ||
239 | pr_info("Clocks: disable unused %s\n", ck->name); | |
52958be3 CC |
240 | |
241 | davinci_psc_config(psc_domain(ck), ck->gpsc, ck->lpsc, | |
242 | (ck->flags & PSC_SWRSTDISABLE) ? | |
243 | PSC_STATE_SWRSTDISABLE : PSC_STATE_DISABLE); | |
3e062b07 | 244 | } |
c5b736d0 KH |
245 | spin_unlock_irq(&clockfw_lock); |
246 | ||
247 | return 0; | |
248 | } | |
249 | late_initcall(clk_disable_unused); | |
250 | #endif | |
3e062b07 | 251 | |
de381a91 | 252 | static unsigned long clk_sysclk_recalc(struct clk *clk) |
3e062b07 | 253 | { |
c5b736d0 KH |
254 | u32 v, plldiv; |
255 | struct pll_data *pll; | |
de381a91 | 256 | unsigned long rate = clk->rate; |
c5b736d0 KH |
257 | |
258 | /* If this is the PLL base clock, no more calculations needed */ | |
259 | if (clk->pll_data) | |
de381a91 | 260 | return rate; |
c5b736d0 KH |
261 | |
262 | if (WARN_ON(!clk->parent)) | |
de381a91 | 263 | return rate; |
c5b736d0 | 264 | |
de381a91 | 265 | rate = clk->parent->rate; |
c5b736d0 KH |
266 | |
267 | /* Otherwise, the parent must be a PLL */ | |
268 | if (WARN_ON(!clk->parent->pll_data)) | |
de381a91 | 269 | return rate; |
c5b736d0 KH |
270 | |
271 | pll = clk->parent->pll_data; | |
272 | ||
273 | /* If pre-PLL, source clock is before the multiplier and divider(s) */ | |
274 | if (clk->flags & PRE_PLL) | |
de381a91 | 275 | rate = pll->input_rate; |
c5b736d0 KH |
276 | |
277 | if (!clk->div_reg) | |
de381a91 | 278 | return rate; |
c5b736d0 KH |
279 | |
280 | v = __raw_readl(pll->base + clk->div_reg); | |
281 | if (v & PLLDIV_EN) { | |
d6961e68 | 282 | plldiv = (v & pll->div_ratio_mask) + 1; |
c5b736d0 | 283 | if (plldiv) |
de381a91 | 284 | rate /= plldiv; |
c5b736d0 | 285 | } |
de381a91 SN |
286 | |
287 | return rate; | |
288 | } | |
289 | ||
290 | static unsigned long clk_leafclk_recalc(struct clk *clk) | |
291 | { | |
292 | if (WARN_ON(!clk->parent)) | |
293 | return clk->rate; | |
294 | ||
295 | return clk->parent->rate; | |
c5b736d0 KH |
296 | } |
297 | ||
de381a91 | 298 | static unsigned long clk_pllclk_recalc(struct clk *clk) |
c5b736d0 KH |
299 | { |
300 | u32 ctrl, mult = 1, prediv = 1, postdiv = 1; | |
301 | u8 bypass; | |
302 | struct pll_data *pll = clk->pll_data; | |
de381a91 | 303 | unsigned long rate = clk->rate; |
c5b736d0 KH |
304 | |
305 | pll->base = IO_ADDRESS(pll->phys_base); | |
306 | ctrl = __raw_readl(pll->base + PLLCTL); | |
de381a91 | 307 | rate = pll->input_rate = clk->parent->rate; |
c5b736d0 KH |
308 | |
309 | if (ctrl & PLLCTL_PLLEN) { | |
310 | bypass = 0; | |
311 | mult = __raw_readl(pll->base + PLLM); | |
fb8fcb89 SP |
312 | if (cpu_is_davinci_dm365()) |
313 | mult = 2 * (mult & PLLM_PLLM_MASK); | |
314 | else | |
315 | mult = (mult & PLLM_PLLM_MASK) + 1; | |
c5b736d0 KH |
316 | } else |
317 | bypass = 1; | |
318 | ||
319 | if (pll->flags & PLL_HAS_PREDIV) { | |
320 | prediv = __raw_readl(pll->base + PREDIV); | |
321 | if (prediv & PLLDIV_EN) | |
d6961e68 | 322 | prediv = (prediv & pll->div_ratio_mask) + 1; |
c5b736d0 KH |
323 | else |
324 | prediv = 1; | |
325 | } | |
326 | ||
327 | /* pre-divider is fixed, but (some?) chips won't report that */ | |
328 | if (cpu_is_davinci_dm355() && pll->num == 1) | |
329 | prediv = 8; | |
330 | ||
331 | if (pll->flags & PLL_HAS_POSTDIV) { | |
332 | postdiv = __raw_readl(pll->base + POSTDIV); | |
333 | if (postdiv & PLLDIV_EN) | |
d6961e68 | 334 | postdiv = (postdiv & pll->div_ratio_mask) + 1; |
c5b736d0 KH |
335 | else |
336 | postdiv = 1; | |
337 | } | |
338 | ||
339 | if (!bypass) { | |
de381a91 SN |
340 | rate /= prediv; |
341 | rate *= mult; | |
342 | rate /= postdiv; | |
c5b736d0 KH |
343 | } |
344 | ||
345 | pr_debug("PLL%d: input = %lu MHz [ ", | |
346 | pll->num, clk->parent->rate / 1000000); | |
347 | if (bypass) | |
348 | pr_debug("bypass "); | |
349 | if (prediv > 1) | |
350 | pr_debug("/ %d ", prediv); | |
351 | if (mult > 1) | |
352 | pr_debug("* %d ", mult); | |
353 | if (postdiv > 1) | |
354 | pr_debug("/ %d ", postdiv); | |
de381a91 SN |
355 | pr_debug("] --> %lu MHz output.\n", rate / 1000000); |
356 | ||
357 | return rate; | |
c5b736d0 KH |
358 | } |
359 | ||
d6a61563 SN |
360 | /** |
361 | * davinci_set_pllrate - set the output rate of a given PLL. | |
362 | * | |
363 | * Note: Currently tested to work with OMAP-L138 only. | |
364 | * | |
365 | * @pll: pll whose rate needs to be changed. | |
366 | * @prediv: The pre divider value. Passing 0 disables the pre-divider. | |
367 | * @pllm: The multiplier value. Passing 0 leads to multiply-by-one. | |
368 | * @postdiv: The post divider value. Passing 0 disables the post-divider. | |
369 | */ | |
370 | int davinci_set_pllrate(struct pll_data *pll, unsigned int prediv, | |
371 | unsigned int mult, unsigned int postdiv) | |
372 | { | |
373 | u32 ctrl; | |
374 | unsigned int locktime; | |
3b43cd6f | 375 | unsigned long flags; |
d6a61563 SN |
376 | |
377 | if (pll->base == NULL) | |
378 | return -EINVAL; | |
379 | ||
380 | /* | |
381 | * PLL lock time required per OMAP-L138 datasheet is | |
382 | * (2000 * prediv)/sqrt(pllm) OSCIN cycles. We approximate sqrt(pllm) | |
383 | * as 4 and OSCIN cycle as 25 MHz. | |
384 | */ | |
385 | if (prediv) { | |
386 | locktime = ((2000 * prediv) / 100); | |
387 | prediv = (prediv - 1) | PLLDIV_EN; | |
388 | } else { | |
9a219a9e | 389 | locktime = PLL_LOCK_TIME; |
d6a61563 SN |
390 | } |
391 | if (postdiv) | |
392 | postdiv = (postdiv - 1) | PLLDIV_EN; | |
393 | if (mult) | |
394 | mult = mult - 1; | |
395 | ||
3b43cd6f SN |
396 | /* Protect against simultaneous calls to PLL setting seqeunce */ |
397 | spin_lock_irqsave(&clockfw_lock, flags); | |
398 | ||
d6a61563 SN |
399 | ctrl = __raw_readl(pll->base + PLLCTL); |
400 | ||
401 | /* Switch the PLL to bypass mode */ | |
402 | ctrl &= ~(PLLCTL_PLLENSRC | PLLCTL_PLLEN); | |
403 | __raw_writel(ctrl, pll->base + PLLCTL); | |
404 | ||
9a219a9e | 405 | udelay(PLL_BYPASS_TIME); |
d6a61563 SN |
406 | |
407 | /* Reset and enable PLL */ | |
408 | ctrl &= ~(PLLCTL_PLLRST | PLLCTL_PLLDIS); | |
409 | __raw_writel(ctrl, pll->base + PLLCTL); | |
410 | ||
411 | if (pll->flags & PLL_HAS_PREDIV) | |
412 | __raw_writel(prediv, pll->base + PREDIV); | |
413 | ||
414 | __raw_writel(mult, pll->base + PLLM); | |
415 | ||
416 | if (pll->flags & PLL_HAS_POSTDIV) | |
417 | __raw_writel(postdiv, pll->base + POSTDIV); | |
418 | ||
9a219a9e | 419 | udelay(PLL_RESET_TIME); |
d6a61563 SN |
420 | |
421 | /* Bring PLL out of reset */ | |
422 | ctrl |= PLLCTL_PLLRST; | |
423 | __raw_writel(ctrl, pll->base + PLLCTL); | |
424 | ||
425 | udelay(locktime); | |
426 | ||
427 | /* Remove PLL from bypass mode */ | |
428 | ctrl |= PLLCTL_PLLEN; | |
429 | __raw_writel(ctrl, pll->base + PLLCTL); | |
430 | ||
3b43cd6f SN |
431 | spin_unlock_irqrestore(&clockfw_lock, flags); |
432 | ||
d6a61563 SN |
433 | return 0; |
434 | } | |
435 | EXPORT_SYMBOL(davinci_set_pllrate); | |
436 | ||
08aca087 | 437 | int __init davinci_clk_init(struct clk_lookup *clocks) |
c5b736d0 | 438 | { |
08aca087 | 439 | struct clk_lookup *c; |
c5b736d0 | 440 | struct clk *clk; |
08aca087 | 441 | size_t num_clocks = 0; |
c5b736d0 | 442 | |
08aca087 KH |
443 | for (c = clocks; c->clk; c++) { |
444 | clk = c->clk; | |
c5b736d0 | 445 | |
de381a91 SN |
446 | if (!clk->recalc) { |
447 | ||
448 | /* Check if clock is a PLL */ | |
449 | if (clk->pll_data) | |
450 | clk->recalc = clk_pllclk_recalc; | |
451 | ||
452 | /* Else, if it is a PLL-derived clock */ | |
453 | else if (clk->flags & CLK_PLL) | |
454 | clk->recalc = clk_sysclk_recalc; | |
455 | ||
456 | /* Otherwise, it is a leaf clock (PSC clock) */ | |
457 | else if (clk->parent) | |
458 | clk->recalc = clk_leafclk_recalc; | |
459 | } | |
c5b736d0 | 460 | |
d6961e68 CC |
461 | if (clk->pll_data && !clk->pll_data->div_ratio_mask) |
462 | clk->pll_data->div_ratio_mask = PLLDIV_RATIO_MASK; | |
463 | ||
de381a91 SN |
464 | if (clk->recalc) |
465 | clk->rate = clk->recalc(clk); | |
c5b736d0 KH |
466 | |
467 | if (clk->lpsc) | |
468 | clk->flags |= CLK_PSC; | |
469 | ||
c5b736d0 | 470 | clk_register(clk); |
08aca087 | 471 | num_clocks++; |
c5b736d0 KH |
472 | |
473 | /* Turn on clocks that Linux doesn't otherwise manage */ | |
474 | if (clk->flags & ALWAYS_ENABLED) | |
475 | clk_enable(clk); | |
3e062b07 VB |
476 | } |
477 | ||
08aca087 KH |
478 | clkdev_add_table(clocks, num_clocks); |
479 | ||
3e062b07 VB |
480 | return 0; |
481 | } | |
482 | ||
2f72e8dc | 483 | #ifdef CONFIG_DEBUG_FS |
3e062b07 | 484 | |
2f72e8dc SN |
485 | #include <linux/debugfs.h> |
486 | #include <linux/seq_file.h> | |
3e062b07 | 487 | |
c5b736d0 KH |
488 | #define CLKNAME_MAX 10 /* longest clock name */ |
489 | #define NEST_DELTA 2 | |
490 | #define NEST_MAX 4 | |
491 | ||
492 | static void | |
493 | dump_clock(struct seq_file *s, unsigned nest, struct clk *parent) | |
3e062b07 | 494 | { |
c5b736d0 KH |
495 | char *state; |
496 | char buf[CLKNAME_MAX + NEST_DELTA * NEST_MAX]; | |
497 | struct clk *clk; | |
498 | unsigned i; | |
499 | ||
500 | if (parent->flags & CLK_PLL) | |
501 | state = "pll"; | |
502 | else if (parent->flags & CLK_PSC) | |
503 | state = "psc"; | |
504 | else | |
505 | state = ""; | |
506 | ||
507 | /* <nest spaces> name <pad to end> */ | |
508 | memset(buf, ' ', sizeof(buf) - 1); | |
509 | buf[sizeof(buf) - 1] = 0; | |
510 | i = strlen(parent->name); | |
511 | memcpy(buf + nest, parent->name, | |
512 | min(i, (unsigned)(sizeof(buf) - 1 - nest))); | |
513 | ||
514 | seq_printf(s, "%s users=%2d %-3s %9ld Hz\n", | |
515 | buf, parent->usecount, state, clk_get_rate(parent)); | |
516 | /* REVISIT show device associations too */ | |
517 | ||
518 | /* cost is now small, but not linear... */ | |
f02bf3b3 SN |
519 | list_for_each_entry(clk, &parent->children, childnode) { |
520 | dump_clock(s, nest + NEST_DELTA, clk); | |
c5b736d0 KH |
521 | } |
522 | } | |
3e062b07 | 523 | |
c5b736d0 KH |
524 | static int davinci_ck_show(struct seq_file *m, void *v) |
525 | { | |
f979aa6e SN |
526 | struct clk *clk; |
527 | ||
528 | /* | |
529 | * Show clock tree; We trust nonzero usecounts equate to PSC enables... | |
c5b736d0 KH |
530 | */ |
531 | mutex_lock(&clocks_mutex); | |
f979aa6e SN |
532 | list_for_each_entry(clk, &clocks, node) |
533 | if (!clk->parent) | |
534 | dump_clock(m, 0, clk); | |
c5b736d0 | 535 | mutex_unlock(&clocks_mutex); |
3e062b07 VB |
536 | |
537 | return 0; | |
538 | } | |
539 | ||
3e062b07 VB |
540 | static int davinci_ck_open(struct inode *inode, struct file *file) |
541 | { | |
2f72e8dc | 542 | return single_open(file, davinci_ck_show, NULL); |
3e062b07 VB |
543 | } |
544 | ||
2f72e8dc | 545 | static const struct file_operations davinci_ck_operations = { |
3e062b07 VB |
546 | .open = davinci_ck_open, |
547 | .read = seq_read, | |
548 | .llseek = seq_lseek, | |
2f72e8dc | 549 | .release = single_release, |
3e062b07 VB |
550 | }; |
551 | ||
2f72e8dc | 552 | static int __init davinci_clk_debugfs_init(void) |
3e062b07 | 553 | { |
2f72e8dc SN |
554 | debugfs_create_file("davinci_clocks", S_IFREG | S_IRUGO, NULL, NULL, |
555 | &davinci_ck_operations); | |
3e062b07 VB |
556 | return 0; |
557 | ||
558 | } | |
2f72e8dc SN |
559 | device_initcall(davinci_clk_debugfs_init); |
560 | #endif /* CONFIG_DEBUG_FS */ |