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Merge tag 'v3.3.7' into 3.3/master
[zen-stable.git] / arch / arm / mach-ux500 / clock.c
blob7379075370040f623842f07a78724657131cdbce
1 /*
2 * Copyright (C) 2009 ST-Ericsson
3 * Copyright (C) 2009 STMicroelectronics
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/list.h>
12 #include <linux/errno.h>
13 #include <linux/err.h>
14 #include <linux/clk.h>
15 #include <linux/io.h>
16 #include <linux/clkdev.h>
17 #include <linux/cpufreq.h>
18
19 #include <plat/mtu.h>
20 #include <mach/hardware.h>
21 #include "clock.h"
22
23 #ifdef CONFIG_DEBUG_FS
24 #include <linux/debugfs.h>
25 #include <linux/uaccess.h> /* for copy_from_user */
26 static LIST_HEAD(clk_list);
27 #endif
28
29 #define PRCC_PCKEN 0x00
30 #define PRCC_PCKDIS 0x04
31 #define PRCC_KCKEN 0x08
32 #define PRCC_KCKDIS 0x0C
33
34 #define PRCM_YYCLKEN0_MGT_SET 0x510
35 #define PRCM_YYCLKEN1_MGT_SET 0x514
36 #define PRCM_YYCLKEN0_MGT_CLR 0x518
37 #define PRCM_YYCLKEN1_MGT_CLR 0x51C
38 #define PRCM_YYCLKEN0_MGT_VAL 0x520
39 #define PRCM_YYCLKEN1_MGT_VAL 0x524
40
41 #define PRCM_SVAMMDSPCLK_MGT 0x008
42 #define PRCM_SIAMMDSPCLK_MGT 0x00C
43 #define PRCM_SGACLK_MGT 0x014
44 #define PRCM_UARTCLK_MGT 0x018
45 #define PRCM_MSP02CLK_MGT 0x01C
46 #define PRCM_MSP1CLK_MGT 0x288
47 #define PRCM_I2CCLK_MGT 0x020
48 #define PRCM_SDMMCCLK_MGT 0x024
49 #define PRCM_SLIMCLK_MGT 0x028
50 #define PRCM_PER1CLK_MGT 0x02C
51 #define PRCM_PER2CLK_MGT 0x030
52 #define PRCM_PER3CLK_MGT 0x034
53 #define PRCM_PER5CLK_MGT 0x038
54 #define PRCM_PER6CLK_MGT 0x03C
55 #define PRCM_PER7CLK_MGT 0x040
56 #define PRCM_LCDCLK_MGT 0x044
57 #define PRCM_BMLCLK_MGT 0x04C
58 #define PRCM_HSITXCLK_MGT 0x050
59 #define PRCM_HSIRXCLK_MGT 0x054
60 #define PRCM_HDMICLK_MGT 0x058
61 #define PRCM_APEATCLK_MGT 0x05C
62 #define PRCM_APETRACECLK_MGT 0x060
63 #define PRCM_MCDECLK_MGT 0x064
64 #define PRCM_IPI2CCLK_MGT 0x068
65 #define PRCM_DSIALTCLK_MGT 0x06C
66 #define PRCM_DMACLK_MGT 0x074
67 #define PRCM_B2R2CLK_MGT 0x078
68 #define PRCM_TVCLK_MGT 0x07C
69 #define PRCM_TCR 0x1C8
70 #define PRCM_TCR_STOPPED (1 << 16)
71 #define PRCM_TCR_DOZE_MODE (1 << 17)
72 #define PRCM_UNIPROCLK_MGT 0x278
73 #define PRCM_SSPCLK_MGT 0x280
74 #define PRCM_RNGCLK_MGT 0x284
75 #define PRCM_UICCCLK_MGT 0x27C
76
77 #define PRCM_MGT_ENABLE (1 << 8)
78
79 static DEFINE_SPINLOCK(clocks_lock);
80
81 static void __clk_enable(struct clk *clk)
82 {
83 if (clk->enabled++ == 0) {
84 if (clk->parent_cluster)
85 __clk_enable(clk->parent_cluster);
86
87 if (clk->parent_periph)
88 __clk_enable(clk->parent_periph);
89
90 if (clk->ops && clk->ops->enable)
91 clk->ops->enable(clk);
92 }
93 }
94
95 int clk_enable(struct clk *clk)
96 {
97 unsigned long flags;
98
99 spin_lock_irqsave(&clocks_lock, flags);
100 __clk_enable(clk);
101 spin_unlock_irqrestore(&clocks_lock, flags);
102
103 return 0;
104 }
105 EXPORT_SYMBOL(clk_enable);
106
107 static void __clk_disable(struct clk *clk)
108 {
109 if (--clk->enabled == 0) {
110 if (clk->ops && clk->ops->disable)
111 clk->ops->disable(clk);
112
113 if (clk->parent_periph)
114 __clk_disable(clk->parent_periph);
115
116 if (clk->parent_cluster)
117 __clk_disable(clk->parent_cluster);
118 }
119 }
120
121 void clk_disable(struct clk *clk)
122 {
123 unsigned long flags;
124
125 WARN_ON(!clk->enabled);
126
127 spin_lock_irqsave(&clocks_lock, flags);
128 __clk_disable(clk);
129 spin_unlock_irqrestore(&clocks_lock, flags);
130 }
131 EXPORT_SYMBOL(clk_disable);
132
133 /*
134 * The MTU has a separate, rather complex muxing setup
135 * with alternative parents (peripheral cluster or
136 * ULP or fixed 32768 Hz) depending on settings
137 */
138 static unsigned long clk_mtu_get_rate(struct clk *clk)
139 {
140 void __iomem *addr;
141 u32 tcr;
142 int mtu = (int) clk->data;
143 /*
144 * One of these is selected eventually
145 * TODO: Replace the constant with a reference
146 * to the ULP source once this is modeled.
147 */
148 unsigned long clk32k = 32768;
149 unsigned long mturate;
150 unsigned long retclk;
151
152 if (cpu_is_u5500())
153 addr = __io_address(U5500_PRCMU_BASE);
154 else if (cpu_is_u8500())
155 addr = __io_address(U8500_PRCMU_BASE);
156 else
157 ux500_unknown_soc();
158
159 /*
160 * On a startup, always conifgure the TCR to the doze mode;
161 * bootloaders do it for us. Do this in the kernel too.
162 */
163 writel(PRCM_TCR_DOZE_MODE, addr + PRCM_TCR);
164
165 tcr = readl(addr + PRCM_TCR);
166
167 /* Get the rate from the parent as a default */
168 if (clk->parent_periph)
169 mturate = clk_get_rate(clk->parent_periph);
170 else if (clk->parent_cluster)
171 mturate = clk_get_rate(clk->parent_cluster);
172 else
173 /* We need to be connected SOMEWHERE */
174 BUG();
175
176 /* Return the clock selected for this MTU */
177 if (tcr & (1 << mtu))
178 retclk = clk32k;
179 else
180 retclk = mturate;
181
182 pr_info("MTU%d clock rate: %lu Hz\n", mtu, retclk);
183 return retclk;
184 }
185
186 unsigned long clk_get_rate(struct clk *clk)
187 {
188 unsigned long rate;
189
190 /*
191 * If there is a custom getrate callback for this clock,
192 * it will take precedence.
193 */
194 if (clk->get_rate)
195 return clk->get_rate(clk);
196
197 if (clk->ops && clk->ops->get_rate)
198 return clk->ops->get_rate(clk);
199
200 rate = clk->rate;
201 if (!rate) {
202 if (clk->parent_periph)
203 rate = clk_get_rate(clk->parent_periph);
204 else if (clk->parent_cluster)
205 rate = clk_get_rate(clk->parent_cluster);
206 }
207
208 return rate;
209 }
210 EXPORT_SYMBOL(clk_get_rate);
211
212 long clk_round_rate(struct clk *clk, unsigned long rate)
213 {
214 /*TODO*/
215 return rate;
216 }
217 EXPORT_SYMBOL(clk_round_rate);
218
219 int clk_set_rate(struct clk *clk, unsigned long rate)
220 {
221 clk->rate = rate;
222 return 0;
223 }
224 EXPORT_SYMBOL(clk_set_rate);
225
226 static void clk_prcmu_enable(struct clk *clk)
227 {
228 void __iomem *cg_set_reg = __io_address(U8500_PRCMU_BASE)
229 + PRCM_YYCLKEN0_MGT_SET + clk->prcmu_cg_off;
230
231 writel(1 << clk->prcmu_cg_bit, cg_set_reg);
232 }
233
234 static void clk_prcmu_disable(struct clk *clk)
235 {
236 void __iomem *cg_clr_reg = __io_address(U8500_PRCMU_BASE)
237 + PRCM_YYCLKEN0_MGT_CLR + clk->prcmu_cg_off;
238
239 writel(1 << clk->prcmu_cg_bit, cg_clr_reg);
240 }
241
242 static struct clkops clk_prcmu_ops = {
243 .enable = clk_prcmu_enable,
244 .disable = clk_prcmu_disable,
245 };
246
247 static unsigned int clkrst_base[] = {
248 [1] = U8500_CLKRST1_BASE,
249 [2] = U8500_CLKRST2_BASE,
250 [3] = U8500_CLKRST3_BASE,
251 [5] = U8500_CLKRST5_BASE,
252 [6] = U8500_CLKRST6_BASE,
253 };
254
255 static void clk_prcc_enable(struct clk *clk)
256 {
257 void __iomem *addr = __io_address(clkrst_base[clk->cluster]);
258
259 if (clk->prcc_kernel != -1)
260 writel(1 << clk->prcc_kernel, addr + PRCC_KCKEN);
261
262 if (clk->prcc_bus != -1)
263 writel(1 << clk->prcc_bus, addr + PRCC_PCKEN);
264 }
265
266 static void clk_prcc_disable(struct clk *clk)
267 {
268 void __iomem *addr = __io_address(clkrst_base[clk->cluster]);
269
270 if (clk->prcc_bus != -1)
271 writel(1 << clk->prcc_bus, addr + PRCC_PCKDIS);
272
273 if (clk->prcc_kernel != -1)
274 writel(1 << clk->prcc_kernel, addr + PRCC_KCKDIS);
275 }
276
277 static struct clkops clk_prcc_ops = {
278 .enable = clk_prcc_enable,
279 .disable = clk_prcc_disable,
280 };
281
282 static struct clk clk_32khz = {
283 .name = "clk_32khz",
284 .rate = 32000,
285 };
286
287 /*
288 * PRCMU level clock gating
289 */
290
291 /* Bank 0 */
292 static DEFINE_PRCMU_CLK(svaclk, 0x0, 2, SVAMMDSPCLK);
293 static DEFINE_PRCMU_CLK(siaclk, 0x0, 3, SIAMMDSPCLK);
294 static DEFINE_PRCMU_CLK(sgaclk, 0x0, 4, SGACLK);
295 static DEFINE_PRCMU_CLK_RATE(uartclk, 0x0, 5, UARTCLK, 38400000);
296 static DEFINE_PRCMU_CLK(msp02clk, 0x0, 6, MSP02CLK);
297 static DEFINE_PRCMU_CLK(msp1clk, 0x0, 7, MSP1CLK); /* v1 */
298 static DEFINE_PRCMU_CLK_RATE(i2cclk, 0x0, 8, I2CCLK, 48000000);
299 static DEFINE_PRCMU_CLK_RATE(sdmmcclk, 0x0, 9, SDMMCCLK, 100000000);
300 static DEFINE_PRCMU_CLK(slimclk, 0x0, 10, SLIMCLK);
301 static DEFINE_PRCMU_CLK(per1clk, 0x0, 11, PER1CLK);
302 static DEFINE_PRCMU_CLK(per2clk, 0x0, 12, PER2CLK);
303 static DEFINE_PRCMU_CLK(per3clk, 0x0, 13, PER3CLK);
304 static DEFINE_PRCMU_CLK(per5clk, 0x0, 14, PER5CLK);
305 static DEFINE_PRCMU_CLK_RATE(per6clk, 0x0, 15, PER6CLK, 133330000);
306 static DEFINE_PRCMU_CLK(lcdclk, 0x0, 17, LCDCLK);
307 static DEFINE_PRCMU_CLK(bmlclk, 0x0, 18, BMLCLK);
308 static DEFINE_PRCMU_CLK(hsitxclk, 0x0, 19, HSITXCLK);
309 static DEFINE_PRCMU_CLK(hsirxclk, 0x0, 20, HSIRXCLK);
310 static DEFINE_PRCMU_CLK(hdmiclk, 0x0, 21, HDMICLK);
311 static DEFINE_PRCMU_CLK(apeatclk, 0x0, 22, APEATCLK);
312 static DEFINE_PRCMU_CLK(apetraceclk, 0x0, 23, APETRACECLK);
313 static DEFINE_PRCMU_CLK(mcdeclk, 0x0, 24, MCDECLK);
314 static DEFINE_PRCMU_CLK(ipi2clk, 0x0, 25, IPI2CCLK);
315 static DEFINE_PRCMU_CLK(dsialtclk, 0x0, 26, DSIALTCLK); /* v1 */
316 static DEFINE_PRCMU_CLK(dmaclk, 0x0, 27, DMACLK);
317 static DEFINE_PRCMU_CLK(b2r2clk, 0x0, 28, B2R2CLK);
318 static DEFINE_PRCMU_CLK(tvclk, 0x0, 29, TVCLK);
319 static DEFINE_PRCMU_CLK(uniproclk, 0x0, 30, UNIPROCLK); /* v1 */
320 static DEFINE_PRCMU_CLK_RATE(sspclk, 0x0, 31, SSPCLK, 48000000); /* v1 */
321
322 /* Bank 1 */
323 static DEFINE_PRCMU_CLK(rngclk, 0x4, 0, RNGCLK); /* v1 */
324 static DEFINE_PRCMU_CLK(uiccclk, 0x4, 1, UICCCLK); /* v1 */
325
326 /*
327 * PRCC level clock gating
328 * Format: per#, clk, PCKEN bit, KCKEN bit, parent
329 */
330
331 /* Peripheral Cluster #1 */
332 static DEFINE_PRCC_CLK(1, i2c4, 10, 9, &clk_i2cclk);
333 static DEFINE_PRCC_CLK(1, gpio0, 9, -1, NULL);
334 static DEFINE_PRCC_CLK(1, slimbus0, 8, 8, &clk_slimclk);
335 static DEFINE_PRCC_CLK(1, spi3, 7, -1, NULL);
336 static DEFINE_PRCC_CLK(1, i2c2, 6, 6, &clk_i2cclk);
337 static DEFINE_PRCC_CLK(1, sdi0, 5, 5, &clk_sdmmcclk);
338 static DEFINE_PRCC_CLK(1, msp1, 4, 4, &clk_msp1clk);
339 static DEFINE_PRCC_CLK(1, msp0, 3, 3, &clk_msp02clk);
340 static DEFINE_PRCC_CLK(1, i2c1, 2, 2, &clk_i2cclk);
341 static DEFINE_PRCC_CLK(1, uart1, 1, 1, &clk_uartclk);
342 static DEFINE_PRCC_CLK(1, uart0, 0, 0, &clk_uartclk);
343
344 /* Peripheral Cluster #2 */
345 static DEFINE_PRCC_CLK(2, gpio1, 11, -1, NULL);
346 static DEFINE_PRCC_CLK(2, ssitx, 10, 7, NULL);
347 static DEFINE_PRCC_CLK(2, ssirx, 9, 6, NULL);
348 static DEFINE_PRCC_CLK(2, spi0, 8, -1, NULL);
349 static DEFINE_PRCC_CLK(2, sdi3, 7, 5, &clk_sdmmcclk);
350 static DEFINE_PRCC_CLK(2, sdi1, 6, 4, &clk_sdmmcclk);
351 static DEFINE_PRCC_CLK(2, msp2, 5, 3, &clk_msp02clk);
352 static DEFINE_PRCC_CLK(2, sdi4, 4, 2, &clk_sdmmcclk);
353 static DEFINE_PRCC_CLK(2, pwl, 3, 1, NULL);
354 static DEFINE_PRCC_CLK(2, spi1, 2, -1, NULL);
355 static DEFINE_PRCC_CLK(2, spi2, 1, -1, NULL);
356 static DEFINE_PRCC_CLK(2, i2c3, 0, 0, &clk_i2cclk);
357
358 /* Peripheral Cluster #3 */
359 static DEFINE_PRCC_CLK(3, gpio2, 8, -1, NULL);
360 static DEFINE_PRCC_CLK(3, sdi5, 7, 7, &clk_sdmmcclk);
361 static DEFINE_PRCC_CLK(3, uart2, 6, 6, &clk_uartclk);
362 static DEFINE_PRCC_CLK(3, ske, 5, 5, &clk_32khz);
363 static DEFINE_PRCC_CLK(3, sdi2, 4, 4, &clk_sdmmcclk);
364 static DEFINE_PRCC_CLK(3, i2c0, 3, 3, &clk_i2cclk);
365 static DEFINE_PRCC_CLK(3, ssp1, 2, 2, &clk_sspclk);
366 static DEFINE_PRCC_CLK(3, ssp0, 1, 1, &clk_sspclk);
367 static DEFINE_PRCC_CLK(3, fsmc, 0, -1, NULL);
368
369 /* Peripheral Cluster #4 is in the always on domain */
370
371 /* Peripheral Cluster #5 */
372 static DEFINE_PRCC_CLK(5, gpio3, 1, -1, NULL);
373 static DEFINE_PRCC_CLK(5, usb, 0, 0, NULL);
374
375 /* Peripheral Cluster #6 */
376
377 /* MTU ID in data */
378 static DEFINE_PRCC_CLK_CUSTOM(6, mtu1, 8, -1, NULL, clk_mtu_get_rate, 1);
379 static DEFINE_PRCC_CLK_CUSTOM(6, mtu0, 7, -1, NULL, clk_mtu_get_rate, 0);
380 static DEFINE_PRCC_CLK(6, cfgreg, 6, 6, NULL);
381 static DEFINE_PRCC_CLK(6, hash1, 5, -1, NULL);
382 static DEFINE_PRCC_CLK(6, unipro, 4, 1, &clk_uniproclk);
383 static DEFINE_PRCC_CLK(6, pka, 3, -1, NULL);
384 static DEFINE_PRCC_CLK(6, hash0, 2, -1, NULL);
385 static DEFINE_PRCC_CLK(6, cryp0, 1, -1, NULL);
386 static DEFINE_PRCC_CLK(6, rng, 0, 0, &clk_rngclk);
387
388 static struct clk clk_dummy_apb_pclk = {
389 .name = "apb_pclk",
390 };
391
392 static struct clk_lookup u8500_clks[] = {
393 CLK(dummy_apb_pclk, NULL, "apb_pclk"),
394
395 /* Peripheral Cluster #1 */
396 CLK(gpio0, "gpio.0", NULL),
397 CLK(gpio0, "gpio.1", NULL),
398 CLK(slimbus0, "slimbus0", NULL),
399 CLK(i2c2, "nmk-i2c.2", NULL),
400 CLK(sdi0, "sdi0", NULL),
401 CLK(msp0, "msp0", NULL),
402 CLK(i2c1, "nmk-i2c.1", NULL),
403 CLK(uart1, "uart1", NULL),
404 CLK(uart0, "uart0", NULL),
405
406 /* Peripheral Cluster #3 */
407 CLK(gpio2, "gpio.2", NULL),
408 CLK(gpio2, "gpio.3", NULL),
409 CLK(gpio2, "gpio.4", NULL),
410 CLK(gpio2, "gpio.5", NULL),
411 CLK(sdi5, "sdi5", NULL),
412 CLK(uart2, "uart2", NULL),
413 CLK(ske, "ske", NULL),
414 CLK(ske, "nmk-ske-keypad", NULL),
415 CLK(sdi2, "sdi2", NULL),
416 CLK(i2c0, "nmk-i2c.0", NULL),
417 CLK(fsmc, "fsmc", NULL),
418
419 /* Peripheral Cluster #5 */
420 CLK(gpio3, "gpio.8", NULL),
421
422 /* Peripheral Cluster #6 */
423 CLK(hash1, "hash1", NULL),
424 CLK(pka, "pka", NULL),
425 CLK(hash0, "hash0", NULL),
426 CLK(cryp0, "cryp0", NULL),
427
428 /* PRCMU level clock gating */
429
430 /* Bank 0 */
431 CLK(svaclk, "sva", NULL),
432 CLK(siaclk, "sia", NULL),
433 CLK(sgaclk, "sga", NULL),
434 CLK(slimclk, "slim", NULL),
435 CLK(lcdclk, "lcd", NULL),
436 CLK(bmlclk, "bml", NULL),
437 CLK(hsitxclk, "stm-hsi.0", NULL),
438 CLK(hsirxclk, "stm-hsi.1", NULL),
439 CLK(hdmiclk, "hdmi", NULL),
440 CLK(apeatclk, "apeat", NULL),
441 CLK(apetraceclk, "apetrace", NULL),
442 CLK(mcdeclk, "mcde", NULL),
443 CLK(ipi2clk, "ipi2", NULL),
444 CLK(dmaclk, "dma40.0", NULL),
445 CLK(b2r2clk, "b2r2", NULL),
446 CLK(tvclk, "tv", NULL),
447
448 /* Peripheral Cluster #1 */
449 CLK(i2c4, "nmk-i2c.4", NULL),
450 CLK(spi3, "spi3", NULL),
451 CLK(msp1, "msp1", NULL),
452
453 /* Peripheral Cluster #2 */
454 CLK(gpio1, "gpio.6", NULL),
455 CLK(gpio1, "gpio.7", NULL),
456 CLK(ssitx, "ssitx", NULL),
457 CLK(ssirx, "ssirx", NULL),
458 CLK(spi0, "spi0", NULL),
459 CLK(sdi3, "sdi3", NULL),
460 CLK(sdi1, "sdi1", NULL),
461 CLK(msp2, "msp2", NULL),
462 CLK(sdi4, "sdi4", NULL),
463 CLK(pwl, "pwl", NULL),
464 CLK(spi1, "spi1", NULL),
465 CLK(spi2, "spi2", NULL),
466 CLK(i2c3, "nmk-i2c.3", NULL),
467
468 /* Peripheral Cluster #3 */
469 CLK(ssp1, "ssp1", NULL),
470 CLK(ssp0, "ssp0", NULL),
471
472 /* Peripheral Cluster #5 */
473 CLK(usb, "musb-ux500.0", "usb"),
474
475 /* Peripheral Cluster #6 */
476 CLK(mtu1, "mtu1", NULL),
477 CLK(mtu0, "mtu0", NULL),
478 CLK(cfgreg, "cfgreg", NULL),
479 CLK(hash1, "hash1", NULL),
480 CLK(unipro, "unipro", NULL),
481 CLK(rng, "rng", NULL),
482
483 /* PRCMU level clock gating */
484
485 /* Bank 0 */
486 CLK(uniproclk, "uniproclk", NULL),
487 CLK(dsialtclk, "dsialt", NULL),
488
489 /* Bank 1 */
490 CLK(rngclk, "rng", NULL),
491 CLK(uiccclk, "uicc", NULL),
492 };
493
494 #ifdef CONFIG_DEBUG_FS
495 /*
496 * debugfs support to trace clock tree hierarchy and attributes with
497 * powerdebug
498 */
499 static struct dentry *clk_debugfs_root;
500
501 void __init clk_debugfs_add_table(struct clk_lookup *cl, size_t num)
502 {
503 while (num--) {
504 /* Check that the clock has not been already registered */
505 if (!(cl->clk->list.prev != cl->clk->list.next))
506 list_add_tail(&cl->clk->list, &clk_list);
507
508 cl++;
509 }
510 }
511
512 static ssize_t usecount_dbg_read(struct file *file, char __user *buf,
513 size_t size, loff_t *off)
514 {
515 struct clk *clk = file->f_dentry->d_inode->i_private;
516 char cusecount[128];
517 unsigned int len;
518
519 len = sprintf(cusecount, "%u\n", clk->enabled);
520 return simple_read_from_buffer(buf, size, off, cusecount, len);
521 }
522
523 static ssize_t rate_dbg_read(struct file *file, char __user *buf,
524 size_t size, loff_t *off)
525 {
526 struct clk *clk = file->f_dentry->d_inode->i_private;
527 char crate[128];
528 unsigned int rate;
529 unsigned int len;
530
531 rate = clk_get_rate(clk);
532 len = sprintf(crate, "%u\n", rate);
533 return simple_read_from_buffer(buf, size, off, crate, len);
534 }
535
536 static const struct file_operations usecount_fops = {
537 .read = usecount_dbg_read,
538 };
539
540 static const struct file_operations set_rate_fops = {
541 .read = rate_dbg_read,
542 };
543
544 static struct dentry *clk_debugfs_register_dir(struct clk *c,
545 struct dentry *p_dentry)
546 {
547 struct dentry *d, *clk_d;
548 const char *p = c->name;
549
550 if (!p)
551 p = "BUG";
552
553 clk_d = debugfs_create_dir(p, p_dentry);
554 if (!clk_d)
555 return NULL;
556
557 d = debugfs_create_file("usecount", S_IRUGO,
558 clk_d, c, &usecount_fops);
559 if (!d)
560 goto err_out;
561 d = debugfs_create_file("rate", S_IRUGO,
562 clk_d, c, &set_rate_fops);
563 if (!d)
564 goto err_out;
565 /*
566 * TODO : not currently available in ux500
567 * d = debugfs_create_x32("flags", S_IRUGO, clk_d, (u32 *)&c->flags);
568 * if (!d)
569 * goto err_out;
570 */
571
572 return clk_d;
573
574 err_out:
575 debugfs_remove_recursive(clk_d);
576 return NULL;
577 }
578
579 static int clk_debugfs_register_one(struct clk *c)
580 {
581 struct clk *pa = c->parent_periph;
582 struct clk *bpa = c->parent_cluster;
583
584 if (!(bpa && !pa)) {
585 c->dent = clk_debugfs_register_dir(c,
586 pa ? pa->dent : clk_debugfs_root);
587 if (!c->dent)
588 return -ENOMEM;
589 }
590
591 if (bpa) {
592 c->dent_bus = clk_debugfs_register_dir(c,
593 bpa->dent_bus ? bpa->dent_bus : bpa->dent);
594 if ((!c->dent_bus) && (c->dent)) {
595 debugfs_remove_recursive(c->dent);
596 c->dent = NULL;
597 return -ENOMEM;
598 }
599 }
600 return 0;
601 }
602
603 static int clk_debugfs_register(struct clk *c)
604 {
605 int err;
606 struct clk *pa = c->parent_periph;
607 struct clk *bpa = c->parent_cluster;
608
609 if (pa && (!pa->dent && !pa->dent_bus)) {
610 err = clk_debugfs_register(pa);
611 if (err)
612 return err;
613 }
614
615 if (bpa && (!bpa->dent && !bpa->dent_bus)) {
616 err = clk_debugfs_register(bpa);
617 if (err)
618 return err;
619 }
620
621 if ((!c->dent) && (!c->dent_bus)) {
622 err = clk_debugfs_register_one(c);
623 if (err)
624 return err;
625 }
626 return 0;
627 }
628
629 static int __init clk_debugfs_init(void)
630 {
631 struct clk *c;
632 struct dentry *d;
633 int err;
634
635 d = debugfs_create_dir("clock", NULL);
636 if (!d)
637 return -ENOMEM;
638 clk_debugfs_root = d;
639
640 list_for_each_entry(c, &clk_list, list) {
641 err = clk_debugfs_register(c);
642 if (err)
643 goto err_out;
644 }
645 return 0;
646 err_out:
647 debugfs_remove_recursive(clk_debugfs_root);
648 return err;
649 }
650
651 late_initcall(clk_debugfs_init);
652 #endif /* defined(CONFIG_DEBUG_FS) */
653
654 unsigned long clk_smp_twd_rate = 500000000;
655
656 unsigned long clk_smp_twd_get_rate(struct clk *clk)
657 {
658 return clk_smp_twd_rate;
659 }
660
661 static struct clk clk_smp_twd = {
662 .get_rate = clk_smp_twd_get_rate,
663 .name = "smp_twd",
664 };
665
666 static struct clk_lookup clk_smp_twd_lookup = {
667 .dev_id = "smp_twd",
668 .clk = &clk_smp_twd,
669 };
670
671 #ifdef CONFIG_CPU_FREQ
672
673 static int clk_twd_cpufreq_transition(struct notifier_block *nb,
674 unsigned long state, void *data)
675 {
676 struct cpufreq_freqs *f = data;
677
678 if (state == CPUFREQ_PRECHANGE) {
679 /* Save frequency in simple Hz */
680 clk_smp_twd_rate = (f->new * 1000) / 2;
681 }
682
683 return NOTIFY_OK;
684 }
685
686 static struct notifier_block clk_twd_cpufreq_nb = {
687 .notifier_call = clk_twd_cpufreq_transition,
688 };
689
690 static int clk_init_smp_twd_cpufreq(void)
691 {
692 return cpufreq_register_notifier(&clk_twd_cpufreq_nb,
693 CPUFREQ_TRANSITION_NOTIFIER);
694 }
695 late_initcall(clk_init_smp_twd_cpufreq);
696
697 #endif
698
699 int __init clk_init(void)
700 {
701 if (cpu_is_u5500()) {
702 /* Clock tree for U5500 not implemented yet */
703 clk_prcc_ops.enable = clk_prcc_ops.disable = NULL;
704 clk_prcmu_ops.enable = clk_prcmu_ops.disable = NULL;
705 clk_uartclk.rate = 36360000;
706 clk_sdmmcclk.rate = 99900000;
707 }
708
709 clkdev_add_table(u8500_clks, ARRAY_SIZE(u8500_clks));
710 clkdev_add(&clk_smp_twd_lookup);
711
712 #ifdef CONFIG_DEBUG_FS
713 clk_debugfs_add_table(u8500_clks, ARRAY_SIZE(u8500_clks));
714 #endif
715 return 0;
716 }