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-rw-r--r--arch/arm/mach-u300/clock.c1487
1 files changed, 1487 insertions, 0 deletions
diff --git a/arch/arm/mach-u300/clock.c b/arch/arm/mach-u300/clock.c
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index 000000000000..5cd04d6751b3
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1/*
2 *
3 * arch/arm/mach-u300/clock.c
4 *
5 *
6 * Copyright (C) 2007-2009 ST-Ericsson AB
7 * License terms: GNU General Public License (GPL) version 2
8 * Define clocks in the app platform.
9 * Author: Linus Walleij <linus.walleij@stericsson.com>
10 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
11 *
12 */
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/list.h>
16#include <linux/errno.h>
17#include <linux/err.h>
18#include <linux/string.h>
19#include <linux/clk.h>
20#include <linux/mutex.h>
21#include <linux/spinlock.h>
22#include <linux/debugfs.h>
23#include <linux/device.h>
24#include <linux/init.h>
25#include <linux/timer.h>
26#include <linux/io.h>
27
28#include <asm/clkdev.h>
29#include <mach/hardware.h>
30#include <mach/syscon.h>
31
32#include "clock.h"
33
34/*
35 * TODO:
36 * - move all handling of the CCR register into this file and create
37 * a spinlock for the CCR register
38 * - switch to the clkdevice lookup mechanism that maps clocks to
39 * device ID:s instead when it becomes available in kernel 2.6.29.
40 * - implement rate get/set for all clocks that need it.
41 */
42
43/*
44 * Syscon clock I/O registers lock so clock requests don't collide
45 * NOTE: this is a local lock only used to lock access to clock and
46 * reset registers in syscon.
47 */
48static DEFINE_SPINLOCK(syscon_clkreg_lock);
49static DEFINE_SPINLOCK(syscon_resetreg_lock);
50
51/*
52 * The clocking hierarchy currently looks like this.
53 * NOTE: the idea is NOT to show how the clocks are routed on the chip!
54 * The ideas is to show dependencies, so a clock higher up in the
55 * hierarchy has to be on in order for another clock to be on. Now,
56 * both CPU and DMA can actually be on top of the hierarchy, and that
57 * is not modeled currently. Instead we have the backbone AMBA bus on
58 * top. This bus cannot be programmed in any way but conceptually it
59 * needs to be active for the bridges and devices to transport data.
60 *
61 * Please be aware that a few clocks are hw controlled, which mean that
62 * the hw itself can turn on/off or change the rate of the clock when
63 * needed!
64 *
65 * AMBA bus
66 * |
67 * +- CPU
68 * +- NANDIF NAND Flash interface
69 * +- SEMI Shared Memory interface
70 * +- ISP Image Signal Processor (U335 only)
71 * +- CDS (U335 only)
72 * +- DMA Direct Memory Access Controller
73 * +- AAIF APP/ACC Inteface (Mobile Scalable Link, MSL)
74 * +- APEX
75 * +- VIDEO_ENC AVE2/3 Video Encoder
76 * +- XGAM Graphics Accelerator Controller
77 * +- AHB
78 * |
79 * +- ahb:0 AHB Bridge
80 * | |
81 * | +- ahb:1 INTCON Interrupt controller
82 * | +- ahb:3 MSPRO Memory Stick Pro controller
83 * | +- ahb:4 EMIF External Memory interface
84 * |
85 * +- fast:0 FAST bridge
86 * | |
87 * | +- fast:1 MMCSD MMC/SD card reader controller
88 * | +- fast:2 I2S0 PCM I2S channel 0 controller
89 * | +- fast:3 I2S1 PCM I2S channel 1 controller
90 * | +- fast:4 I2C0 I2C channel 0 controller
91 * | +- fast:5 I2C1 I2C channel 1 controller
92 * | +- fast:6 SPI SPI controller
93 * | +- fast:7 UART1 Secondary UART (U335 only)
94 * |
95 * +- slow:0 SLOW bridge
96 * |
97 * +- slow:1 SYSCON (not possible to control)
98 * +- slow:2 WDOG Watchdog
99 * +- slow:3 UART0 primary UART
100 * +- slow:4 TIMER_APP Application timer - used in Linux
101 * +- slow:5 KEYPAD controller
102 * +- slow:6 GPIO controller
103 * +- slow:7 RTC controller
104 * +- slow:8 BT Bus Tracer (not used currently)
105 * +- slow:9 EH Event Handler (not used currently)
106 * +- slow:a TIMER_ACC Access style timer (not used currently)
107 * +- slow:b PPM (U335 only, what is that?)
108 */
109
110/*
111 * Reset control functions. We remember if a block has been
112 * taken out of reset and don't remove the reset assertion again
113 * and vice versa. Currently we only remove resets so the
114 * enablement function is defined out.
115 */
116static void syscon_block_reset_enable(struct clk *clk)
117{
118 u16 val;
119 unsigned long iflags;
120
121 /* Not all blocks support resetting */
122 if (!clk->res_reg || !clk->res_mask)
123 return;
124 spin_lock_irqsave(&syscon_resetreg_lock, iflags);
125 val = readw(clk->res_reg);
126 val |= clk->res_mask;
127 writew(val, clk->res_reg);
128 spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
129 clk->reset = true;
130}
131
132static void syscon_block_reset_disable(struct clk *clk)
133{
134 u16 val;
135 unsigned long iflags;
136
137 /* Not all blocks support resetting */
138 if (!clk->res_reg || !clk->res_mask)
139 return;
140 spin_lock_irqsave(&syscon_resetreg_lock, iflags);
141 val = readw(clk->res_reg);
142 val &= ~clk->res_mask;
143 writew(val, clk->res_reg);
144 spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
145 clk->reset = false;
146}
147
148int __clk_get(struct clk *clk)
149{
150 u16 val;
151
152 /* The MMC and MSPRO clocks need some special set-up */
153 if (!strcmp(clk->name, "MCLK")) {
154 /* Set default MMC clock divisor to 18.9 MHz */
155 writew(0x0054U, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
156 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
157 /* Disable the MMC feedback clock */
158 val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
159 /* Disable MSPRO frequency */
160 val &= ~U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
161 writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
162 }
163 if (!strcmp(clk->name, "MSPRO")) {
164 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
165 /* Disable the MMC feedback clock */
166 val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
167 /* Enable MSPRO frequency */
168 val |= U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
169 writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
170 }
171 return 1;
172}
173EXPORT_SYMBOL(__clk_get);
174
175void __clk_put(struct clk *clk)
176{
177}
178EXPORT_SYMBOL(__clk_put);
179
180static void syscon_clk_disable(struct clk *clk)
181{
182 unsigned long iflags;
183
184 /* Don't touch the hardware controlled clocks */
185 if (clk->hw_ctrld)
186 return;
187
188 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
189 writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCDR);
190 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
191}
192
193static void syscon_clk_enable(struct clk *clk)
194{
195 unsigned long iflags;
196
197 /* Don't touch the hardware controlled clocks */
198 if (clk->hw_ctrld)
199 return;
200
201 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
202 writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCER);
203 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
204}
205
206static u16 syscon_clk_get_rate(void)
207{
208 u16 val;
209 unsigned long iflags;
210
211 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
212 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
213 val &= U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
214 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
215 return val;
216}
217
218#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
219static void enable_i2s0_vcxo(void)
220{
221 u16 val;
222 unsigned long iflags;
223
224 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
225 /* Set I2S0 to use the VCXO 26 MHz clock */
226 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
227 val |= U300_SYSCON_CCR_TURN_VCXO_ON;
228 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
229 val |= U300_SYSCON_CCR_I2S0_USE_VCXO;
230 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
231 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
232 val |= U300_SYSCON_CEFR_I2S0_CLK_EN;
233 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
234 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
235}
236
237static void enable_i2s1_vcxo(void)
238{
239 u16 val;
240 unsigned long iflags;
241
242 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
243 /* Set I2S1 to use the VCXO 26 MHz clock */
244 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
245 val |= U300_SYSCON_CCR_TURN_VCXO_ON;
246 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
247 val |= U300_SYSCON_CCR_I2S1_USE_VCXO;
248 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
249 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
250 val |= U300_SYSCON_CEFR_I2S1_CLK_EN;
251 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
252 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
253}
254
255static void disable_i2s0_vcxo(void)
256{
257 u16 val;
258 unsigned long iflags;
259
260 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
261 /* Disable I2S0 use of the VCXO 26 MHz clock */
262 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
263 val &= ~U300_SYSCON_CCR_I2S0_USE_VCXO;
264 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
265 /* Deactivate VCXO if noone else is using VCXO */
266 if (!(val & U300_SYSCON_CCR_I2S1_USE_VCXO))
267 val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
268 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
269 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
270 val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
271 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
272 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
273}
274
275static void disable_i2s1_vcxo(void)
276{
277 u16 val;
278 unsigned long iflags;
279
280 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
281 /* Disable I2S1 use of the VCXO 26 MHz clock */
282 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
283 val &= ~U300_SYSCON_CCR_I2S1_USE_VCXO;
284 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
285 /* Deactivate VCXO if noone else is using VCXO */
286 if (!(val & U300_SYSCON_CCR_I2S0_USE_VCXO))
287 val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
288 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
289 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
290 val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
291 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
292 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
293}
294#endif /* CONFIG_MACH_U300_USE_I2S_AS_MASTER */
295
296
297static void syscon_clk_rate_set_mclk(unsigned long rate)
298{
299 u16 val;
300 u32 reg;
301 unsigned long iflags;
302
303 switch (rate) {
304 case 18900000:
305 val = 0x0054;
306 break;
307 case 20800000:
308 val = 0x0044;
309 break;
310 case 23100000:
311 val = 0x0043;
312 break;
313 case 26000000:
314 val = 0x0033;
315 break;
316 case 29700000:
317 val = 0x0032;
318 break;
319 case 34700000:
320 val = 0x0022;
321 break;
322 case 41600000:
323 val = 0x0021;
324 break;
325 case 52000000:
326 val = 0x0011;
327 break;
328 case 104000000:
329 val = 0x0000;
330 break;
331 default:
332 printk(KERN_ERR "Trying to set MCLK to unknown speed! %ld\n",
333 rate);
334 return;
335 }
336
337 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
338 reg = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
339 ~U300_SYSCON_MMF0R_MASK;
340 writew(reg | val, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
341 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
342}
343
344void syscon_clk_rate_set_cpuclk(unsigned long rate)
345{
346 u16 val;
347 unsigned long iflags;
348
349 switch (rate) {
350 case 13000000:
351 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER;
352 break;
353 case 52000000:
354 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE;
355 break;
356 case 104000000:
357 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH;
358 break;
359 case 208000000:
360 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST;
361 break;
362 default:
363 return;
364 }
365 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
366 val |= readw(U300_SYSCON_VBASE + U300_SYSCON_CCR) &
367 ~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK ;
368 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
369 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
370}
371EXPORT_SYMBOL(syscon_clk_rate_set_cpuclk);
372
373void clk_disable(struct clk *clk)
374{
375 unsigned long iflags;
376
377 spin_lock_irqsave(&clk->lock, iflags);
378 if (clk->usecount > 0 && !(--clk->usecount)) {
379 /* some blocks lack clocking registers and cannot be disabled */
380 if (clk->disable)
381 clk->disable(clk);
382 if (likely((u32)clk->parent))
383 clk_disable(clk->parent);
384 }
385#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
386 if (unlikely(!strcmp(clk->name, "I2S0")))
387 disable_i2s0_vcxo();
388 if (unlikely(!strcmp(clk->name, "I2S1")))
389 disable_i2s1_vcxo();
390#endif
391 spin_unlock_irqrestore(&clk->lock, iflags);
392}
393EXPORT_SYMBOL(clk_disable);
394
395int clk_enable(struct clk *clk)
396{
397 int ret = 0;
398 unsigned long iflags;
399
400 spin_lock_irqsave(&clk->lock, iflags);
401 if (clk->usecount++ == 0) {
402 if (likely((u32)clk->parent))
403 ret = clk_enable(clk->parent);
404
405 if (unlikely(ret != 0))
406 clk->usecount--;
407 else {
408 /* remove reset line (we never enable reset again) */
409 syscon_block_reset_disable(clk);
410 /* clocks without enable function are always on */
411 if (clk->enable)
412 clk->enable(clk);
413#ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
414 if (unlikely(!strcmp(clk->name, "I2S0")))
415 enable_i2s0_vcxo();
416 if (unlikely(!strcmp(clk->name, "I2S1")))
417 enable_i2s1_vcxo();
418#endif
419 }
420 }
421 spin_unlock_irqrestore(&clk->lock, iflags);
422 return ret;
423
424}
425EXPORT_SYMBOL(clk_enable);
426
427/* Returns the clock rate in Hz */
428static unsigned long clk_get_rate_cpuclk(struct clk *clk)
429{
430 u16 val;
431
432 val = syscon_clk_get_rate();
433
434 switch (val) {
435 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
436 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
437 return 13000000;
438 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
439 return 52000000;
440 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
441 return 104000000;
442 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
443 return 208000000;
444 default:
445 break;
446 }
447 return clk->rate;
448}
449
450static unsigned long clk_get_rate_ahb_clk(struct clk *clk)
451{
452 u16 val;
453
454 val = syscon_clk_get_rate();
455
456 switch (val) {
457 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
458 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
459 return 6500000;
460 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
461 return 26000000;
462 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
463 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
464 return 52000000;
465 default:
466 break;
467 }
468 return clk->rate;
469
470}
471
472static unsigned long clk_get_rate_emif_clk(struct clk *clk)
473{
474 u16 val;
475
476 val = syscon_clk_get_rate();
477
478 switch (val) {
479 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
480 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
481 return 13000000;
482 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
483 return 52000000;
484 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
485 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
486 return 104000000;
487 default:
488 break;
489 }
490 return clk->rate;
491
492}
493
494static unsigned long clk_get_rate_xgamclk(struct clk *clk)
495{
496 u16 val;
497
498 val = syscon_clk_get_rate();
499
500 switch (val) {
501 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
502 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
503 return 6500000;
504 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
505 return 26000000;
506 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
507 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
508 return 52000000;
509 default:
510 break;
511 }
512
513 return clk->rate;
514}
515
516static unsigned long clk_get_rate_mclk(struct clk *clk)
517{
518 u16 val;
519
520 val = syscon_clk_get_rate();
521
522 switch (val) {
523 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
524 /*
525 * Here, the 208 MHz PLL gets shut down and the always
526 * on 13 MHz PLL used for RTC etc kicks into use
527 * instead.
528 */
529 return 13000000;
530 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
531 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
532 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
533 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
534 {
535 /*
536 * This clock is under program control. The register is
537 * divided in two nybbles, bit 7-4 gives cycles-1 to count
538 * high, bit 3-0 gives cycles-1 to count low. Distribute
539 * these with no more than 1 cycle difference between
540 * low and high and add low and high to get the actual
541 * divisor. The base PLL is 208 MHz. Writing 0x00 will
542 * divide by 1 and 1 so the highest frequency possible
543 * is 104 MHz.
544 *
545 * e.g. 0x54 =>
546 * f = 208 / ((5+1) + (4+1)) = 208 / 11 = 18.9 MHz
547 */
548 u16 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
549 U300_SYSCON_MMF0R_MASK;
550 switch (val) {
551 case 0x0054:
552 return 18900000;
553 case 0x0044:
554 return 20800000;
555 case 0x0043:
556 return 23100000;
557 case 0x0033:
558 return 26000000;
559 case 0x0032:
560 return 29700000;
561 case 0x0022:
562 return 34700000;
563 case 0x0021:
564 return 41600000;
565 case 0x0011:
566 return 52000000;
567 case 0x0000:
568 return 104000000;
569 default:
570 break;
571 }
572 }
573 default:
574 break;
575 }
576
577 return clk->rate;
578}
579
580static unsigned long clk_get_rate_i2s_i2c_spi(struct clk *clk)
581{
582 u16 val;
583
584 val = syscon_clk_get_rate();
585
586 switch (val) {
587 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
588 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
589 return 13000000;
590 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
591 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
592 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
593 return 26000000;
594 default:
595 break;
596 }
597
598 return clk->rate;
599}
600
601unsigned long clk_get_rate(struct clk *clk)
602{
603 if (clk->get_rate)
604 return clk->get_rate(clk);
605 else
606 return clk->rate;
607}
608EXPORT_SYMBOL(clk_get_rate);
609
610static unsigned long clk_round_rate_mclk(struct clk *clk, unsigned long rate)
611{
612 if (rate >= 18900000)
613 return 18900000;
614 if (rate >= 20800000)
615 return 20800000;
616 if (rate >= 23100000)
617 return 23100000;
618 if (rate >= 26000000)
619 return 26000000;
620 if (rate >= 29700000)
621 return 29700000;
622 if (rate >= 34700000)
623 return 34700000;
624 if (rate >= 41600000)
625 return 41600000;
626 if (rate >= 52000000)
627 return 52000000;
628 return -EINVAL;
629}
630
631static unsigned long clk_round_rate_cpuclk(struct clk *clk, unsigned long rate)
632{
633 if (rate >= 13000000)
634 return 13000000;
635 if (rate >= 52000000)
636 return 52000000;
637 if (rate >= 104000000)
638 return 104000000;
639 if (rate >= 208000000)
640 return 208000000;
641 return -EINVAL;
642}
643
644/*
645 * This adjusts a requested rate to the closest exact rate
646 * a certain clock can provide. For a fixed clock it's
647 * mostly clk->rate.
648 */
649long clk_round_rate(struct clk *clk, unsigned long rate)
650{
651 /* TODO: get apropriate switches for EMIFCLK, AHBCLK and MCLK */
652 /* Else default to fixed value */
653
654 if (clk->round_rate) {
655 return (long) clk->round_rate(clk, rate);
656 } else {
657 printk(KERN_ERR "clock: Failed to round rate of %s\n",
658 clk->name);
659 }
660 return (long) clk->rate;
661}
662EXPORT_SYMBOL(clk_round_rate);
663
664static int clk_set_rate_mclk(struct clk *clk, unsigned long rate)
665{
666 syscon_clk_rate_set_mclk(clk_round_rate(clk, rate));
667 return 0;
668}
669
670static int clk_set_rate_cpuclk(struct clk *clk, unsigned long rate)
671{
672 syscon_clk_rate_set_cpuclk(clk_round_rate(clk, rate));
673 return 0;
674}
675
676int clk_set_rate(struct clk *clk, unsigned long rate)
677{
678 /* TODO: set for EMIFCLK and AHBCLK */
679 /* Else assume the clock is fixed and fail */
680 if (clk->set_rate) {
681 return clk->set_rate(clk, rate);
682 } else {
683 printk(KERN_ERR "clock: Failed to set %s to %ld hz\n",
684 clk->name, rate);
685 return -EINVAL;
686 }
687}
688EXPORT_SYMBOL(clk_set_rate);
689
690/*
691 * Clock definitions. The clock parents are set to respective
692 * bridge and the clock framework makes sure that the clocks have
693 * parents activated and are brought out of reset when in use.
694 *
695 * Clocks that have hw_ctrld = true are hw controlled, and the hw
696 * can by itself turn these clocks on and off.
697 * So in other words, we don't really have to care about them.
698 */
699
700static struct clk amba_clk = {
701 .name = "AMBA",
702 .rate = 52000000, /* this varies! */
703 .hw_ctrld = true,
704 .reset = false,
705};
706
707/*
708 * These blocks are connected directly to the AMBA bus
709 * with no bridge.
710 */
711
712static struct clk cpu_clk = {
713 .name = "CPU",
714 .parent = &amba_clk,
715 .rate = 208000000, /* this varies! */
716 .hw_ctrld = true,
717 .reset = true,
718 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
719 .res_mask = U300_SYSCON_RRR_CPU_RESET_EN,
720 .set_rate = clk_set_rate_cpuclk,
721 .get_rate = clk_get_rate_cpuclk,
722 .round_rate = clk_round_rate_cpuclk,
723};
724
725static struct clk nandif_clk = {
726 .name = "NANDIF",
727 .parent = &amba_clk,
728 .hw_ctrld = false,
729 .reset = true,
730 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
731 .res_mask = U300_SYSCON_RRR_NANDIF_RESET_EN,
732 .clk_val = U300_SYSCON_SBCER_NANDIF_CLK_EN,
733 .enable = syscon_clk_enable,
734 .disable = syscon_clk_disable,
735};
736
737static struct clk semi_clk = {
738 .name = "SEMI",
739 .parent = &amba_clk,
740 .rate = 0, /* FIXME */
741 /* It is not possible to reset SEMI */
742 .hw_ctrld = false,
743 .reset = false,
744 .clk_val = U300_SYSCON_SBCER_SEMI_CLK_EN,
745 .enable = syscon_clk_enable,
746 .disable = syscon_clk_disable,
747};
748
749#ifdef CONFIG_MACH_U300_BS335
750static struct clk isp_clk = {
751 .name = "ISP",
752 .parent = &amba_clk,
753 .rate = 0, /* FIXME */
754 .hw_ctrld = false,
755 .reset = true,
756 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
757 .res_mask = U300_SYSCON_RRR_ISP_RESET_EN,
758 .clk_val = U300_SYSCON_SBCER_ISP_CLK_EN,
759 .enable = syscon_clk_enable,
760 .disable = syscon_clk_disable,
761};
762
763static struct clk cds_clk = {
764 .name = "CDS",
765 .parent = &amba_clk,
766 .rate = 0, /* FIXME */
767 .hw_ctrld = false,
768 .reset = true,
769 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
770 .res_mask = U300_SYSCON_RRR_CDS_RESET_EN,
771 .clk_val = U300_SYSCON_SBCER_CDS_CLK_EN,
772 .enable = syscon_clk_enable,
773 .disable = syscon_clk_disable,
774};
775#endif
776
777static struct clk dma_clk = {
778 .name = "DMA",
779 .parent = &amba_clk,
780 .rate = 52000000, /* this varies! */
781 .hw_ctrld = true,
782 .reset = true,
783 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
784 .res_mask = U300_SYSCON_RRR_DMAC_RESET_EN,
785 .clk_val = U300_SYSCON_SBCER_DMAC_CLK_EN,
786 .enable = syscon_clk_enable,
787 .disable = syscon_clk_disable,
788};
789
790static struct clk aaif_clk = {
791 .name = "AAIF",
792 .parent = &amba_clk,
793 .rate = 52000000, /* this varies! */
794 .hw_ctrld = true,
795 .reset = true,
796 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
797 .res_mask = U300_SYSCON_RRR_AAIF_RESET_EN,
798 .clk_val = U300_SYSCON_SBCER_AAIF_CLK_EN,
799 .enable = syscon_clk_enable,
800 .disable = syscon_clk_disable,
801};
802
803static struct clk apex_clk = {
804 .name = "APEX",
805 .parent = &amba_clk,
806 .rate = 0, /* FIXME */
807 .hw_ctrld = true,
808 .reset = true,
809 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
810 .res_mask = U300_SYSCON_RRR_APEX_RESET_EN,
811 .clk_val = U300_SYSCON_SBCER_APEX_CLK_EN,
812 .enable = syscon_clk_enable,
813 .disable = syscon_clk_disable,
814};
815
816static struct clk video_enc_clk = {
817 .name = "VIDEO_ENC",
818 .parent = &amba_clk,
819 .rate = 208000000, /* this varies! */
820 .hw_ctrld = false,
821 .reset = false,
822 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
823 /* This has XGAM in the name but refers to the video encoder */
824 .res_mask = U300_SYSCON_RRR_XGAM_VC_SYNC_RESET_EN,
825 .clk_val = U300_SYSCON_SBCER_VIDEO_ENC_CLK_EN,
826 .enable = syscon_clk_enable,
827 .disable = syscon_clk_disable,
828};
829
830static struct clk xgam_clk = {
831 .name = "XGAMCLK",
832 .parent = &amba_clk,
833 .rate = 52000000, /* this varies! */
834 .hw_ctrld = false,
835 .reset = true,
836 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
837 .res_mask = U300_SYSCON_RRR_XGAM_RESET_EN,
838 .clk_val = U300_SYSCON_SBCER_XGAM_CLK_EN,
839 .get_rate = clk_get_rate_xgamclk,
840 .enable = syscon_clk_enable,
841 .disable = syscon_clk_disable,
842};
843
844/* This clock is used to activate the video encoder */
845static struct clk ahb_clk = {
846 .name = "AHB",
847 .parent = &amba_clk,
848 .rate = 52000000, /* this varies! */
849 .hw_ctrld = false, /* This one is set to false due to HW bug */
850 .reset = true,
851 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
852 .res_mask = U300_SYSCON_RRR_AHB_RESET_EN,
853 .clk_val = U300_SYSCON_SBCER_AHB_CLK_EN,
854 .enable = syscon_clk_enable,
855 .disable = syscon_clk_disable,
856 .get_rate = clk_get_rate_ahb_clk,
857};
858
859
860/*
861 * Clocks on the AHB bridge
862 */
863
864static struct clk ahb_subsys_clk = {
865 .name = "AHB_SUBSYS",
866 .parent = &amba_clk,
867 .rate = 52000000, /* this varies! */
868 .hw_ctrld = true,
869 .reset = false,
870 .clk_val = U300_SYSCON_SBCER_AHB_SUBSYS_BRIDGE_CLK_EN,
871 .enable = syscon_clk_enable,
872 .disable = syscon_clk_disable,
873 .get_rate = clk_get_rate_ahb_clk,
874};
875
876static struct clk intcon_clk = {
877 .name = "INTCON",
878 .parent = &ahb_subsys_clk,
879 .rate = 52000000, /* this varies! */
880 .hw_ctrld = false,
881 .reset = true,
882 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
883 .res_mask = U300_SYSCON_RRR_INTCON_RESET_EN,
884 /* INTCON can be reset but not clock-gated */
885};
886
887static struct clk mspro_clk = {
888 .name = "MSPRO",
889 .parent = &ahb_subsys_clk,
890 .rate = 0, /* FIXME */
891 .hw_ctrld = false,
892 .reset = true,
893 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
894 .res_mask = U300_SYSCON_RRR_MSPRO_RESET_EN,
895 .clk_val = U300_SYSCON_SBCER_MSPRO_CLK_EN,
896 .enable = syscon_clk_enable,
897 .disable = syscon_clk_disable,
898};
899
900static struct clk emif_clk = {
901 .name = "EMIF",
902 .parent = &ahb_subsys_clk,
903 .rate = 104000000, /* this varies! */
904 .hw_ctrld = false,
905 .reset = true,
906 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
907 .res_mask = U300_SYSCON_RRR_EMIF_RESET_EN,
908 .clk_val = U300_SYSCON_SBCER_EMIF_CLK_EN,
909 .enable = syscon_clk_enable,
910 .disable = syscon_clk_disable,
911 .get_rate = clk_get_rate_emif_clk,
912};
913
914
915/*
916 * Clocks on the FAST bridge
917 */
918static struct clk fast_clk = {
919 .name = "FAST_BRIDGE",
920 .parent = &amba_clk,
921 .rate = 13000000, /* this varies! */
922 .hw_ctrld = true,
923 .reset = true,
924 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
925 .res_mask = U300_SYSCON_RFR_FAST_BRIDGE_RESET_ENABLE,
926 .clk_val = U300_SYSCON_SBCER_FAST_BRIDGE_CLK_EN,
927 .enable = syscon_clk_enable,
928 .disable = syscon_clk_disable,
929};
930
931static struct clk mmcsd_clk = {
932 .name = "MCLK",
933 .parent = &fast_clk,
934 .rate = 18900000, /* this varies! */
935 .hw_ctrld = false,
936 .reset = true,
937 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
938 .res_mask = U300_SYSCON_RFR_MMC_RESET_ENABLE,
939 .clk_val = U300_SYSCON_SBCER_MMC_CLK_EN,
940 .get_rate = clk_get_rate_mclk,
941 .set_rate = clk_set_rate_mclk,
942 .round_rate = clk_round_rate_mclk,
943 .disable = syscon_clk_disable,
944 .enable = syscon_clk_enable,
945};
946
947static struct clk i2s0_clk = {
948 .name = "i2s0",
949 .parent = &fast_clk,
950 .rate = 26000000, /* this varies! */
951 .hw_ctrld = true,
952 .reset = true,
953 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
954 .res_mask = U300_SYSCON_RFR_PCM_I2S0_RESET_ENABLE,
955 .clk_val = U300_SYSCON_SBCER_I2S0_CORE_CLK_EN,
956 .enable = syscon_clk_enable,
957 .disable = syscon_clk_disable,
958 .get_rate = clk_get_rate_i2s_i2c_spi,
959};
960
961static struct clk i2s1_clk = {
962 .name = "i2s1",
963 .parent = &fast_clk,
964 .rate = 26000000, /* this varies! */
965 .hw_ctrld = true,
966 .reset = true,
967 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
968 .res_mask = U300_SYSCON_RFR_PCM_I2S1_RESET_ENABLE,
969 .clk_val = U300_SYSCON_SBCER_I2S1_CORE_CLK_EN,
970 .enable = syscon_clk_enable,
971 .disable = syscon_clk_disable,
972 .get_rate = clk_get_rate_i2s_i2c_spi,
973};
974
975static struct clk i2c0_clk = {
976 .name = "I2C0",
977 .parent = &fast_clk,
978 .rate = 26000000, /* this varies! */
979 .hw_ctrld = false,
980 .reset = true,
981 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
982 .res_mask = U300_SYSCON_RFR_I2C0_RESET_ENABLE,
983 .clk_val = U300_SYSCON_SBCER_I2C0_CLK_EN,
984 .enable = syscon_clk_enable,
985 .disable = syscon_clk_disable,
986 .get_rate = clk_get_rate_i2s_i2c_spi,
987};
988
989static struct clk i2c1_clk = {
990 .name = "I2C1",
991 .parent = &fast_clk,
992 .rate = 26000000, /* this varies! */
993 .hw_ctrld = false,
994 .reset = true,
995 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
996 .res_mask = U300_SYSCON_RFR_I2C1_RESET_ENABLE,
997 .clk_val = U300_SYSCON_SBCER_I2C1_CLK_EN,
998 .enable = syscon_clk_enable,
999 .disable = syscon_clk_disable,
1000 .get_rate = clk_get_rate_i2s_i2c_spi,
1001};
1002
1003static struct clk spi_clk = {
1004 .name = "SPI",
1005 .parent = &fast_clk,
1006 .rate = 26000000, /* this varies! */
1007 .hw_ctrld = false,
1008 .reset = true,
1009 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
1010 .res_mask = U300_SYSCON_RFR_SPI_RESET_ENABLE,
1011 .clk_val = U300_SYSCON_SBCER_SPI_CLK_EN,
1012 .enable = syscon_clk_enable,
1013 .disable = syscon_clk_disable,
1014 .get_rate = clk_get_rate_i2s_i2c_spi,
1015};
1016
1017#ifdef CONFIG_MACH_U300_BS335
1018static struct clk uart1_clk = {
1019 .name = "UART1",
1020 .parent = &fast_clk,
1021 .rate = 13000000,
1022 .hw_ctrld = false,
1023 .reset = true,
1024 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
1025 .res_mask = U300_SYSCON_RFR_UART1_RESET_ENABLE,
1026 .clk_val = U300_SYSCON_SBCER_UART1_CLK_EN,
1027 .enable = syscon_clk_enable,
1028 .disable = syscon_clk_disable,
1029};
1030#endif
1031
1032
1033/*
1034 * Clocks on the SLOW bridge
1035 */
1036static struct clk slow_clk = {
1037 .name = "SLOW_BRIDGE",
1038 .parent = &amba_clk,
1039 .rate = 13000000,
1040 .hw_ctrld = true,
1041 .reset = true,
1042 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1043 .res_mask = U300_SYSCON_RSR_SLOW_BRIDGE_RESET_EN,
1044 .clk_val = U300_SYSCON_SBCER_SLOW_BRIDGE_CLK_EN,
1045 .enable = syscon_clk_enable,
1046 .disable = syscon_clk_disable,
1047};
1048
1049/* TODO: implement SYSCON clock? */
1050
1051static struct clk wdog_clk = {
1052 .name = "WDOG",
1053 .parent = &slow_clk,
1054 .hw_ctrld = false,
1055 .rate = 32768,
1056 .reset = false,
1057 /* This is always on, cannot be enabled/disabled or reset */
1058};
1059
1060/* This one is hardwired to PLL13 */
1061static struct clk uart_clk = {
1062 .name = "UARTCLK",
1063 .parent = &slow_clk,
1064 .rate = 13000000,
1065 .hw_ctrld = false,
1066 .reset = true,
1067 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1068 .res_mask = U300_SYSCON_RSR_UART_RESET_EN,
1069 .clk_val = U300_SYSCON_SBCER_UART_CLK_EN,
1070 .enable = syscon_clk_enable,
1071 .disable = syscon_clk_disable,
1072};
1073
1074static struct clk keypad_clk = {
1075 .name = "KEYPAD",
1076 .parent = &slow_clk,
1077 .rate = 32768,
1078 .hw_ctrld = false,
1079 .reset = true,
1080 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1081 .res_mask = U300_SYSCON_RSR_KEYPAD_RESET_EN,
1082 .clk_val = U300_SYSCON_SBCER_KEYPAD_CLK_EN,
1083 .enable = syscon_clk_enable,
1084 .disable = syscon_clk_disable,
1085};
1086
1087static struct clk gpio_clk = {
1088 .name = "GPIO",
1089 .parent = &slow_clk,
1090 .rate = 13000000,
1091 .hw_ctrld = true,
1092 .reset = true,
1093 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1094 .res_mask = U300_SYSCON_RSR_GPIO_RESET_EN,
1095 .clk_val = U300_SYSCON_SBCER_GPIO_CLK_EN,
1096 .enable = syscon_clk_enable,
1097 .disable = syscon_clk_disable,
1098};
1099
1100static struct clk rtc_clk = {
1101 .name = "RTC",
1102 .parent = &slow_clk,
1103 .rate = 32768,
1104 .hw_ctrld = true,
1105 .reset = true,
1106 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1107 .res_mask = U300_SYSCON_RSR_RTC_RESET_EN,
1108 /* This clock is always on, cannot be enabled/disabled */
1109};
1110
1111static struct clk bustr_clk = {
1112 .name = "BUSTR",
1113 .parent = &slow_clk,
1114 .rate = 13000000,
1115 .hw_ctrld = true,
1116 .reset = true,
1117 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1118 .res_mask = U300_SYSCON_RSR_BTR_RESET_EN,
1119 .clk_val = U300_SYSCON_SBCER_BTR_CLK_EN,
1120 .enable = syscon_clk_enable,
1121 .disable = syscon_clk_disable,
1122};
1123
1124static struct clk evhist_clk = {
1125 .name = "EVHIST",
1126 .parent = &slow_clk,
1127 .rate = 13000000,
1128 .hw_ctrld = true,
1129 .reset = true,
1130 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1131 .res_mask = U300_SYSCON_RSR_EH_RESET_EN,
1132 .clk_val = U300_SYSCON_SBCER_EH_CLK_EN,
1133 .enable = syscon_clk_enable,
1134 .disable = syscon_clk_disable,
1135};
1136
1137static struct clk timer_clk = {
1138 .name = "TIMER",
1139 .parent = &slow_clk,
1140 .rate = 13000000,
1141 .hw_ctrld = true,
1142 .reset = true,
1143 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1144 .res_mask = U300_SYSCON_RSR_ACC_TMR_RESET_EN,
1145 .clk_val = U300_SYSCON_SBCER_ACC_TMR_CLK_EN,
1146 .enable = syscon_clk_enable,
1147 .disable = syscon_clk_disable,
1148};
1149
1150static struct clk app_timer_clk = {
1151 .name = "TIMER_APP",
1152 .parent = &slow_clk,
1153 .rate = 13000000,
1154 .hw_ctrld = true,
1155 .reset = true,
1156 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1157 .res_mask = U300_SYSCON_RSR_APP_TMR_RESET_EN,
1158 .clk_val = U300_SYSCON_SBCER_APP_TMR_CLK_EN,
1159 .enable = syscon_clk_enable,
1160 .disable = syscon_clk_disable,
1161};
1162
1163#ifdef CONFIG_MACH_U300_BS335
1164static struct clk ppm_clk = {
1165 .name = "PPM",
1166 .parent = &slow_clk,
1167 .rate = 0, /* FIXME */
1168 .hw_ctrld = true, /* TODO: Look up if it is hw ctrld or not */
1169 .reset = true,
1170 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1171 .res_mask = U300_SYSCON_RSR_PPM_RESET_EN,
1172 .clk_val = U300_SYSCON_SBCER_PPM_CLK_EN,
1173 .enable = syscon_clk_enable,
1174 .disable = syscon_clk_disable,
1175};
1176#endif
1177
1178#define DEF_LOOKUP(devid, clkref) \
1179 { \
1180 .dev_id = devid, \
1181 .clk = clkref, \
1182 }
1183
1184/*
1185 * Here we only define clocks that are meaningful to
1186 * look up through clockdevice.
1187 */
1188static struct clk_lookup lookups[] = {
1189 /* Connected directly to the AMBA bus */
1190 DEF_LOOKUP("amba", &amba_clk),
1191 DEF_LOOKUP("cpu", &cpu_clk),
1192 DEF_LOOKUP("nandif", &nandif_clk),
1193 DEF_LOOKUP("semi", &semi_clk),
1194#ifdef CONFIG_MACH_U300_BS335
1195 DEF_LOOKUP("isp", &isp_clk),
1196 DEF_LOOKUP("cds", &cds_clk),
1197#endif
1198 DEF_LOOKUP("dma", &dma_clk),
1199 DEF_LOOKUP("aaif", &aaif_clk),
1200 DEF_LOOKUP("apex", &apex_clk),
1201 DEF_LOOKUP("video_enc", &video_enc_clk),
1202 DEF_LOOKUP("xgam", &xgam_clk),
1203 DEF_LOOKUP("ahb", &ahb_clk),
1204 /* AHB bridge clocks */
1205 DEF_LOOKUP("ahb", &ahb_subsys_clk),
1206 DEF_LOOKUP("intcon", &intcon_clk),
1207 DEF_LOOKUP("mspro", &mspro_clk),
1208 DEF_LOOKUP("pl172", &emif_clk),
1209 /* FAST bridge clocks */
1210 DEF_LOOKUP("fast", &fast_clk),
1211 DEF_LOOKUP("mmci", &mmcsd_clk),
1212 /*
1213 * The .0 and .1 identifiers on these comes from the platform device
1214 * .id field and are assigned when the platform devices are registered.
1215 */
1216 DEF_LOOKUP("i2s.0", &i2s0_clk),
1217 DEF_LOOKUP("i2s.1", &i2s1_clk),
1218 DEF_LOOKUP("stddci2c.0", &i2c0_clk),
1219 DEF_LOOKUP("stddci2c.1", &i2c1_clk),
1220 DEF_LOOKUP("pl022", &spi_clk),
1221#ifdef CONFIG_MACH_U300_BS335
1222 DEF_LOOKUP("uart1", &uart1_clk),
1223#endif
1224 /* SLOW bridge clocks */
1225 DEF_LOOKUP("slow", &slow_clk),
1226 DEF_LOOKUP("wdog", &wdog_clk),
1227 DEF_LOOKUP("uart0", &uart_clk),
1228 DEF_LOOKUP("apptimer", &app_timer_clk),
1229 DEF_LOOKUP("keypad", &keypad_clk),
1230 DEF_LOOKUP("u300-gpio", &gpio_clk),
1231 DEF_LOOKUP("rtc0", &rtc_clk),
1232 DEF_LOOKUP("bustr", &bustr_clk),
1233 DEF_LOOKUP("evhist", &evhist_clk),
1234 DEF_LOOKUP("timer", &timer_clk),
1235#ifdef CONFIG_MACH_U300_BS335
1236 DEF_LOOKUP("ppm", &ppm_clk),
1237#endif
1238};
1239
1240static void __init clk_register(void)
1241{
1242 int i;
1243
1244 /* Register the lookups */
1245 for (i = 0; i < ARRAY_SIZE(lookups); i++)
1246 clkdev_add(&lookups[i]);
1247}
1248
1249/*
1250 * These are the clocks for cells registered as primecell drivers
1251 * on the AMBA bus. These must be on during AMBA device registration
1252 * since the bus probe will attempt to read magic configuration
1253 * registers for these devices. If they are deactivated these probes
1254 * will fail.
1255 *
1256 *
1257 * Please note that on emif, both RAM and NAND is connected in dual
1258 * RAM phones. On single RAM phones, ram is on semi and NAND on emif.
1259 *
1260 */
1261void u300_clock_primecells(void)
1262{
1263 clk_enable(&intcon_clk);
1264 clk_enable(&uart_clk);
1265#ifdef CONFIG_MACH_U300_BS335
1266 clk_enable(&uart1_clk);
1267#endif
1268 clk_enable(&spi_clk);
1269
1270 clk_enable(&mmcsd_clk);
1271
1272}
1273EXPORT_SYMBOL(u300_clock_primecells);
1274
1275void u300_unclock_primecells(void)
1276{
1277
1278 clk_disable(&intcon_clk);
1279 clk_disable(&uart_clk);
1280#ifdef CONFIG_MACH_U300_BS335
1281 clk_disable(&uart1_clk);
1282#endif
1283 clk_disable(&spi_clk);
1284 clk_disable(&mmcsd_clk);
1285
1286}
1287EXPORT_SYMBOL(u300_unclock_primecells);
1288
1289/*
1290 * The interrupt controller is enabled before the clock API is registered.
1291 */
1292void u300_enable_intcon_clock(void)
1293{
1294 clk_enable(&intcon_clk);
1295}
1296EXPORT_SYMBOL(u300_enable_intcon_clock);
1297
1298/*
1299 * The timer is enabled before the clock API is registered.
1300 */
1301void u300_enable_timer_clock(void)
1302{
1303 clk_enable(&app_timer_clk);
1304}
1305EXPORT_SYMBOL(u300_enable_timer_clock);
1306
1307#if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG))
1308/*
1309 * The following makes it possible to view the status (especially
1310 * reference count and reset status) for the clocks in the platform
1311 * by looking into the special file <debugfs>/u300_clocks
1312 */
1313
1314/* A list of all clocks in the platform */
1315static struct clk *clks[] = {
1316 /* Top node clock for the AMBA bus */
1317 &amba_clk,
1318 /* Connected directly to the AMBA bus */
1319 &cpu_clk,
1320 &nandif_clk,
1321 &semi_clk,
1322#ifdef CONFIG_MACH_U300_BS335
1323 &isp_clk,
1324 &cds_clk,
1325#endif
1326 &dma_clk,
1327 &aaif_clk,
1328 &apex_clk,
1329 &video_enc_clk,
1330 &xgam_clk,
1331 &ahb_clk,
1332
1333 /* AHB bridge clocks */
1334 &ahb_subsys_clk,
1335 &intcon_clk,
1336 &mspro_clk,
1337 &emif_clk,
1338 /* FAST bridge clocks */
1339 &fast_clk,
1340 &mmcsd_clk,
1341 &i2s0_clk,
1342 &i2s1_clk,
1343 &i2c0_clk,
1344 &i2c1_clk,
1345 &spi_clk,
1346#ifdef CONFIG_MACH_U300_BS335
1347 &uart1_clk,
1348#endif
1349 /* SLOW bridge clocks */
1350 &slow_clk,
1351 &wdog_clk,
1352 &uart_clk,
1353 &app_timer_clk,
1354 &keypad_clk,
1355 &gpio_clk,
1356 &rtc_clk,
1357 &bustr_clk,
1358 &evhist_clk,
1359 &timer_clk,
1360#ifdef CONFIG_MACH_U300_BS335
1361 &ppm_clk,
1362#endif
1363};
1364
1365static int u300_clocks_show(struct seq_file *s, void *data)
1366{
1367 struct clk *clk;
1368 int i;
1369
1370 seq_printf(s, "CLOCK DEVICE RESET STATE\t" \
1371 "ACTIVE\tUSERS\tHW CTRL FREQ\n");
1372 seq_printf(s, "---------------------------------------------" \
1373 "-----------------------------------------\n");
1374 for (i = 0; i < ARRAY_SIZE(clks); i++) {
1375 clk = clks[i];
1376 if (clk != ERR_PTR(-ENOENT)) {
1377 /* Format clock and device name nicely */
1378 char cdp[33];
1379 int chars;
1380
1381 chars = snprintf(&cdp[0], 17, "%s", clk->name);
1382 while (chars < 16) {
1383 cdp[chars] = ' ';
1384 chars++;
1385 }
1386 chars = snprintf(&cdp[16], 17, "%s", clk->dev ?
1387 dev_name(clk->dev) : "N/A");
1388 while (chars < 16) {
1389 cdp[chars+16] = ' ';
1390 chars++;
1391 }
1392 cdp[32] = '\0';
1393 if (clk->get_rate)
1394 seq_printf(s,
1395 "%s%s\t%s\t%d\t%s\t%lu Hz\n",
1396 &cdp[0],
1397 clk->reset ?
1398 "ASSERTED" : "RELEASED",
1399 clk->usecount ? "ON" : "OFF",
1400 clk->usecount,
1401 clk->hw_ctrld ? "YES" : "NO ",
1402 clk->get_rate(clk));
1403 else
1404 seq_printf(s,
1405 "%s%s\t%s\t%d\t%s\t" \
1406 "(unknown rate)\n",
1407 &cdp[0],
1408 clk->reset ?
1409 "ASSERTED" : "RELEASED",
1410 clk->usecount ? "ON" : "OFF",
1411 clk->usecount,
1412 clk->hw_ctrld ? "YES" : "NO ");
1413 }
1414 }
1415 return 0;
1416}
1417
1418static int u300_clocks_open(struct inode *inode, struct file *file)
1419{
1420 return single_open(file, u300_clocks_show, NULL);
1421}
1422
1423static const struct file_operations u300_clocks_operations = {
1424 .open = u300_clocks_open,
1425 .read = seq_read,
1426 .llseek = seq_lseek,
1427 .release = single_release,
1428};
1429
1430static void init_clk_read_procfs(void)
1431{
1432 /* Expose a simple debugfs interface to view all clocks */
1433 (void) debugfs_create_file("u300_clocks", S_IFREG | S_IRUGO,
1434 NULL, NULL, &u300_clocks_operations);
1435}
1436#else
1437static inline void init_clk_read_procfs(void)
1438{
1439}
1440#endif
1441
1442static int __init u300_clock_init(void)
1443{
1444 u16 val;
1445
1446 /*
1447 * FIXME: shall all this powermanagement stuff really live here???
1448 */
1449
1450 /* Set system to run at PLL208, max performance, a known state. */
1451 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
1452 val &= ~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
1453 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
1454 /* Wait for the PLL208 to lock if not locked in yet */
1455 while (!(readw(U300_SYSCON_VBASE + U300_SYSCON_CSR) &
1456 U300_SYSCON_CSR_PLL208_LOCK_IND));
1457
1458 /* Power management enable */
1459 val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
1460 val |= U300_SYSCON_PMCR_PWR_MGNT_ENABLE;
1461 writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
1462
1463 clk_register();
1464
1465 init_clk_read_procfs();
1466
1467 /*
1468 * Some of these may be on when we boot the system so make sure they
1469 * are turned OFF.
1470 */
1471 syscon_block_reset_enable(&timer_clk);
1472 timer_clk.disable(&timer_clk);
1473
1474 /*
1475 * These shall be turned on by default when we boot the system
1476 * so make sure they are ON. (Adding CPU here is a bit too much.)
1477 * These clocks will be claimed by drivers later.
1478 */
1479 syscon_block_reset_disable(&semi_clk);
1480 syscon_block_reset_disable(&emif_clk);
1481 semi_clk.enable(&semi_clk);
1482 emif_clk.enable(&emif_clk);
1483
1484 return 0;
1485}
1486/* initialize clocking early to be available later in the boot */
1487core_initcall(u300_clock_init);
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-19 01:55:29 -0500