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 #include <linux/seq_file.h>
28 #include <linux/clkdev.h>
29
30 #include <mach/hardware.h>
31 #include <mach/syscon.h>
32
33 #include "clock.h"
34
35 /*
36 * TODO:
37 * - move all handling of the CCR register into this file and create
38 * a spinlock for the CCR register
39 * - switch to the clkdevice lookup mechanism that maps clocks to
40 * device ID:s instead when it becomes available in kernel 2.6.29.
41 * - implement rate get/set for all clocks that need it.
42 */
43
44 /*
45 * Syscon clock I/O registers lock so clock requests don't collide
46 * NOTE: this is a local lock only used to lock access to clock and
47 * reset registers in syscon.
48 */
49 static DEFINE_SPINLOCK(syscon_clkreg_lock);
50 static DEFINE_SPINLOCK(syscon_resetreg_lock);
51
52 /*
53 * The clocking hierarchy currently looks like this.
54 * NOTE: the idea is NOT to show how the clocks are routed on the chip!
55 * The ideas is to show dependencies, so a clock higher up in the
56 * hierarchy has to be on in order for another clock to be on. Now,
57 * both CPU and DMA can actually be on top of the hierarchy, and that
58 * is not modeled currently. Instead we have the backbone AMBA bus on
59 * top. This bus cannot be programmed in any way but conceptually it
60 * needs to be active for the bridges and devices to transport data.
61 *
62 * Please be aware that a few clocks are hw controlled, which mean that
63 * the hw itself can turn on/off or change the rate of the clock when
64 * needed!
65 *
66 * AMBA bus
67 * |
68 * +- CPU
69 * +- FSMC NANDIF NAND Flash interface
70 * +- SEMI Shared Memory interface
71 * +- ISP Image Signal Processor (U335 only)
72 * +- CDS (U335 only)
73 * +- DMA Direct Memory Access Controller
74 * +- AAIF APP/ACC Inteface (Mobile Scalable Link, MSL)
75 * +- APEX
76 * +- VIDEO_ENC AVE2/3 Video Encoder
77 * +- XGAM Graphics Accelerator Controller
78 * +- AHB
79 * |
80 * +- ahb:0 AHB Bridge
81 * | |
82 * | +- ahb:1 INTCON Interrupt controller
83 * | +- ahb:3 MSPRO Memory Stick Pro controller
84 * | +- ahb:4 EMIF External Memory interface
85 * |
86 * +- fast:0 FAST bridge
87 * | |
88 * | +- fast:1 MMCSD MMC/SD card reader controller
89 * | +- fast:2 I2S0 PCM I2S channel 0 controller
90 * | +- fast:3 I2S1 PCM I2S channel 1 controller
91 * | +- fast:4 I2C0 I2C channel 0 controller
92 * | +- fast:5 I2C1 I2C channel 1 controller
93 * | +- fast:6 SPI SPI controller
94 * | +- fast:7 UART1 Secondary UART (U335 only)
95 * |
96 * +- slow:0 SLOW bridge
97 * |
98 * +- slow:1 SYSCON (not possible to control)
99 * +- slow:2 WDOG Watchdog
100 * +- slow:3 UART0 primary UART
101 * +- slow:4 TIMER_APP Application timer - used in Linux
102 * +- slow:5 KEYPAD controller
103 * +- slow:6 GPIO controller
104 * +- slow:7 RTC controller
105 * +- slow:8 BT Bus Tracer (not used currently)
106 * +- slow:9 EH Event Handler (not used currently)
107 * +- slow:a TIMER_ACC Access style timer (not used currently)
108 * +- slow:b PPM (U335 only, what is that?)
109 */
110
111 /*
112 * Reset control functions. We remember if a block has been
113 * taken out of reset and don't remove the reset assertion again
114 * and vice versa. Currently we only remove resets so the
115 * enablement function is defined out.
116 */
syscon_block_reset_enable(struct clk * clk)117 static void syscon_block_reset_enable(struct clk *clk)
118 {
119 u16 val;
120 unsigned long iflags;
121
122 /* Not all blocks support resetting */
123 if (!clk->res_reg || !clk->res_mask)
124 return;
125 spin_lock_irqsave(&syscon_resetreg_lock, iflags);
126 val = readw(clk->res_reg);
127 val |= clk->res_mask;
128 writew(val, clk->res_reg);
129 spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
130 clk->reset = true;
131 }
132
syscon_block_reset_disable(struct clk * clk)133 static void syscon_block_reset_disable(struct clk *clk)
134 {
135 u16 val;
136 unsigned long iflags;
137
138 /* Not all blocks support resetting */
139 if (!clk->res_reg || !clk->res_mask)
140 return;
141 spin_lock_irqsave(&syscon_resetreg_lock, iflags);
142 val = readw(clk->res_reg);
143 val &= ~clk->res_mask;
144 writew(val, clk->res_reg);
145 spin_unlock_irqrestore(&syscon_resetreg_lock, iflags);
146 clk->reset = false;
147 }
148
__clk_get(struct clk * clk)149 int __clk_get(struct clk *clk)
150 {
151 u16 val;
152
153 /* The MMC and MSPRO clocks need some special set-up */
154 if (!strcmp(clk->name, "MCLK")) {
155 /* Set default MMC clock divisor to 18.9 MHz */
156 writew(0x0054U, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
157 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
158 /* Disable the MMC feedback clock */
159 val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
160 /* Disable MSPRO frequency */
161 val &= ~U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
162 writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
163 }
164 if (!strcmp(clk->name, "MSPRO")) {
165 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMCR);
166 /* Disable the MMC feedback clock */
167 val &= ~U300_SYSCON_MMCR_MMC_FB_CLK_SEL_ENABLE;
168 /* Enable MSPRO frequency */
169 val |= U300_SYSCON_MMCR_MSPRO_FREQSEL_ENABLE;
170 writew(val, U300_SYSCON_VBASE + U300_SYSCON_MMCR);
171 }
172 return 1;
173 }
174 EXPORT_SYMBOL(__clk_get);
175
__clk_put(struct clk * clk)176 void __clk_put(struct clk *clk)
177 {
178 }
179 EXPORT_SYMBOL(__clk_put);
180
syscon_clk_disable(struct clk * clk)181 static void syscon_clk_disable(struct clk *clk)
182 {
183 unsigned long iflags;
184
185 /* Don't touch the hardware controlled clocks */
186 if (clk->hw_ctrld)
187 return;
188
189 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
190 writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCDR);
191 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
192 }
193
syscon_clk_enable(struct clk * clk)194 static void syscon_clk_enable(struct clk *clk)
195 {
196 unsigned long iflags;
197
198 /* Don't touch the hardware controlled clocks */
199 if (clk->hw_ctrld)
200 return;
201
202 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
203 writew(clk->clk_val, U300_SYSCON_VBASE + U300_SYSCON_SBCER);
204 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
205 }
206
syscon_clk_get_rate(void)207 static u16 syscon_clk_get_rate(void)
208 {
209 u16 val;
210 unsigned long iflags;
211
212 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
213 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
214 val &= U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
215 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
216 return val;
217 }
218
219 #ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
enable_i2s0_vcxo(void)220 static void enable_i2s0_vcxo(void)
221 {
222 u16 val;
223 unsigned long iflags;
224
225 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
226 /* Set I2S0 to use the VCXO 26 MHz clock */
227 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
228 val |= U300_SYSCON_CCR_TURN_VCXO_ON;
229 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
230 val |= U300_SYSCON_CCR_I2S0_USE_VCXO;
231 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
232 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
233 val |= U300_SYSCON_CEFR_I2S0_CLK_EN;
234 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
235 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
236 }
237
enable_i2s1_vcxo(void)238 static void enable_i2s1_vcxo(void)
239 {
240 u16 val;
241 unsigned long iflags;
242
243 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
244 /* Set I2S1 to use the VCXO 26 MHz clock */
245 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
246 val |= U300_SYSCON_CCR_TURN_VCXO_ON;
247 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
248 val |= U300_SYSCON_CCR_I2S1_USE_VCXO;
249 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
250 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
251 val |= U300_SYSCON_CEFR_I2S1_CLK_EN;
252 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
253 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
254 }
255
disable_i2s0_vcxo(void)256 static void disable_i2s0_vcxo(void)
257 {
258 u16 val;
259 unsigned long iflags;
260
261 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
262 /* Disable I2S0 use of the VCXO 26 MHz clock */
263 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
264 val &= ~U300_SYSCON_CCR_I2S0_USE_VCXO;
265 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
266 /* Deactivate VCXO if no one else is using VCXO */
267 if (!(val & U300_SYSCON_CCR_I2S1_USE_VCXO))
268 val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
269 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
270 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
271 val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
272 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
273 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
274 }
275
disable_i2s1_vcxo(void)276 static void disable_i2s1_vcxo(void)
277 {
278 u16 val;
279 unsigned long iflags;
280
281 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
282 /* Disable I2S1 use of the VCXO 26 MHz clock */
283 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
284 val &= ~U300_SYSCON_CCR_I2S1_USE_VCXO;
285 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
286 /* Deactivate VCXO if no one else is using VCXO */
287 if (!(val & U300_SYSCON_CCR_I2S0_USE_VCXO))
288 val &= ~U300_SYSCON_CCR_TURN_VCXO_ON;
289 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
290 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CEFR);
291 val &= ~U300_SYSCON_CEFR_I2S0_CLK_EN;
292 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CEFR);
293 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
294 }
295 #endif /* CONFIG_MACH_U300_USE_I2S_AS_MASTER */
296
297
syscon_clk_rate_set_mclk(unsigned long rate)298 static void syscon_clk_rate_set_mclk(unsigned long rate)
299 {
300 u16 val;
301 u32 reg;
302 unsigned long iflags;
303
304 switch (rate) {
305 case 18900000:
306 val = 0x0054;
307 break;
308 case 20800000:
309 val = 0x0044;
310 break;
311 case 23100000:
312 val = 0x0043;
313 break;
314 case 26000000:
315 val = 0x0033;
316 break;
317 case 29700000:
318 val = 0x0032;
319 break;
320 case 34700000:
321 val = 0x0022;
322 break;
323 case 41600000:
324 val = 0x0021;
325 break;
326 case 52000000:
327 val = 0x0011;
328 break;
329 case 104000000:
330 val = 0x0000;
331 break;
332 default:
333 printk(KERN_ERR "Trying to set MCLK to unknown speed! %ld\n",
334 rate);
335 return;
336 }
337
338 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
339 reg = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
340 ~U300_SYSCON_MMF0R_MASK;
341 writew(reg | val, U300_SYSCON_VBASE + U300_SYSCON_MMF0R);
342 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
343 }
344
syscon_clk_rate_set_cpuclk(unsigned long rate)345 void syscon_clk_rate_set_cpuclk(unsigned long rate)
346 {
347 u16 val;
348 unsigned long iflags;
349
350 switch (rate) {
351 case 13000000:
352 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER;
353 break;
354 case 52000000:
355 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE;
356 break;
357 case 104000000:
358 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH;
359 break;
360 case 208000000:
361 val = U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST;
362 break;
363 default:
364 return;
365 }
366 spin_lock_irqsave(&syscon_clkreg_lock, iflags);
367 val |= readw(U300_SYSCON_VBASE + U300_SYSCON_CCR) &
368 ~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK ;
369 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
370 spin_unlock_irqrestore(&syscon_clkreg_lock, iflags);
371 }
372 EXPORT_SYMBOL(syscon_clk_rate_set_cpuclk);
373
clk_disable(struct clk * clk)374 void clk_disable(struct clk *clk)
375 {
376 unsigned long iflags;
377
378 spin_lock_irqsave(&clk->lock, iflags);
379 if (clk->usecount > 0 && !(--clk->usecount)) {
380 /* some blocks lack clocking registers and cannot be disabled */
381 if (clk->disable)
382 clk->disable(clk);
383 if (likely((u32)clk->parent))
384 clk_disable(clk->parent);
385 }
386 #ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
387 if (unlikely(!strcmp(clk->name, "I2S0")))
388 disable_i2s0_vcxo();
389 if (unlikely(!strcmp(clk->name, "I2S1")))
390 disable_i2s1_vcxo();
391 #endif
392 spin_unlock_irqrestore(&clk->lock, iflags);
393 }
394 EXPORT_SYMBOL(clk_disable);
395
clk_enable(struct clk * clk)396 int clk_enable(struct clk *clk)
397 {
398 int ret = 0;
399 unsigned long iflags;
400
401 spin_lock_irqsave(&clk->lock, iflags);
402 if (clk->usecount++ == 0) {
403 if (likely((u32)clk->parent))
404 ret = clk_enable(clk->parent);
405
406 if (unlikely(ret != 0))
407 clk->usecount--;
408 else {
409 /* remove reset line (we never enable reset again) */
410 syscon_block_reset_disable(clk);
411 /* clocks without enable function are always on */
412 if (clk->enable)
413 clk->enable(clk);
414 #ifdef CONFIG_MACH_U300_USE_I2S_AS_MASTER
415 if (unlikely(!strcmp(clk->name, "I2S0")))
416 enable_i2s0_vcxo();
417 if (unlikely(!strcmp(clk->name, "I2S1")))
418 enable_i2s1_vcxo();
419 #endif
420 }
421 }
422 spin_unlock_irqrestore(&clk->lock, iflags);
423 return ret;
424
425 }
426 EXPORT_SYMBOL(clk_enable);
427
428 /* Returns the clock rate in Hz */
clk_get_rate_cpuclk(struct clk * clk)429 static unsigned long clk_get_rate_cpuclk(struct clk *clk)
430 {
431 u16 val;
432
433 val = syscon_clk_get_rate();
434
435 switch (val) {
436 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
437 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
438 return 13000000;
439 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
440 return 52000000;
441 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
442 return 104000000;
443 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
444 return 208000000;
445 default:
446 break;
447 }
448 return clk->rate;
449 }
450
clk_get_rate_ahb_clk(struct clk * clk)451 static unsigned long clk_get_rate_ahb_clk(struct clk *clk)
452 {
453 u16 val;
454
455 val = syscon_clk_get_rate();
456
457 switch (val) {
458 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
459 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
460 return 6500000;
461 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
462 return 26000000;
463 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
464 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
465 return 52000000;
466 default:
467 break;
468 }
469 return clk->rate;
470
471 }
472
clk_get_rate_emif_clk(struct clk * clk)473 static unsigned long clk_get_rate_emif_clk(struct clk *clk)
474 {
475 u16 val;
476
477 val = syscon_clk_get_rate();
478
479 switch (val) {
480 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
481 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
482 return 13000000;
483 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
484 return 52000000;
485 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
486 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
487 return 104000000;
488 default:
489 break;
490 }
491 return clk->rate;
492
493 }
494
clk_get_rate_xgamclk(struct clk * clk)495 static unsigned long clk_get_rate_xgamclk(struct clk *clk)
496 {
497 u16 val;
498
499 val = syscon_clk_get_rate();
500
501 switch (val) {
502 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
503 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
504 return 6500000;
505 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
506 return 26000000;
507 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
508 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
509 return 52000000;
510 default:
511 break;
512 }
513
514 return clk->rate;
515 }
516
clk_get_rate_mclk(struct clk * clk)517 static unsigned long clk_get_rate_mclk(struct clk *clk)
518 {
519 u16 val;
520
521 val = syscon_clk_get_rate();
522
523 switch (val) {
524 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
525 /*
526 * Here, the 208 MHz PLL gets shut down and the always
527 * on 13 MHz PLL used for RTC etc kicks into use
528 * instead.
529 */
530 return 13000000;
531 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
532 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
533 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
534 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
535 {
536 /*
537 * This clock is under program control. The register is
538 * divided in two nybbles, bit 7-4 gives cycles-1 to count
539 * high, bit 3-0 gives cycles-1 to count low. Distribute
540 * these with no more than 1 cycle difference between
541 * low and high and add low and high to get the actual
542 * divisor. The base PLL is 208 MHz. Writing 0x00 will
543 * divide by 1 and 1 so the highest frequency possible
544 * is 104 MHz.
545 *
546 * e.g. 0x54 =>
547 * f = 208 / ((5+1) + (4+1)) = 208 / 11 = 18.9 MHz
548 */
549 u16 val = readw(U300_SYSCON_VBASE + U300_SYSCON_MMF0R) &
550 U300_SYSCON_MMF0R_MASK;
551 switch (val) {
552 case 0x0054:
553 return 18900000;
554 case 0x0044:
555 return 20800000;
556 case 0x0043:
557 return 23100000;
558 case 0x0033:
559 return 26000000;
560 case 0x0032:
561 return 29700000;
562 case 0x0022:
563 return 34700000;
564 case 0x0021:
565 return 41600000;
566 case 0x0011:
567 return 52000000;
568 case 0x0000:
569 return 104000000;
570 default:
571 break;
572 }
573 }
574 default:
575 break;
576 }
577
578 return clk->rate;
579 }
580
clk_get_rate_i2s_i2c_spi(struct clk * clk)581 static unsigned long clk_get_rate_i2s_i2c_spi(struct clk *clk)
582 {
583 u16 val;
584
585 val = syscon_clk_get_rate();
586
587 switch (val) {
588 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW_POWER:
589 case U300_SYSCON_CCR_CLKING_PERFORMANCE_LOW:
590 return 13000000;
591 case U300_SYSCON_CCR_CLKING_PERFORMANCE_INTERMEDIATE:
592 case U300_SYSCON_CCR_CLKING_PERFORMANCE_HIGH:
593 case U300_SYSCON_CCR_CLKING_PERFORMANCE_BEST:
594 return 26000000;
595 default:
596 break;
597 }
598
599 return clk->rate;
600 }
601
clk_get_rate(struct clk * clk)602 unsigned long clk_get_rate(struct clk *clk)
603 {
604 if (clk->get_rate)
605 return clk->get_rate(clk);
606 else
607 return clk->rate;
608 }
609 EXPORT_SYMBOL(clk_get_rate);
610
clk_round_rate_mclk(struct clk * clk,unsigned long rate)611 static unsigned long clk_round_rate_mclk(struct clk *clk, unsigned long rate)
612 {
613 if (rate <= 18900000)
614 return 18900000;
615 if (rate <= 20800000)
616 return 20800000;
617 if (rate <= 23100000)
618 return 23100000;
619 if (rate <= 26000000)
620 return 26000000;
621 if (rate <= 29700000)
622 return 29700000;
623 if (rate <= 34700000)
624 return 34700000;
625 if (rate <= 41600000)
626 return 41600000;
627 if (rate <= 52000000)
628 return 52000000;
629 return -EINVAL;
630 }
631
clk_round_rate_cpuclk(struct clk * clk,unsigned long rate)632 static unsigned long clk_round_rate_cpuclk(struct clk *clk, unsigned long rate)
633 {
634 if (rate <= 13000000)
635 return 13000000;
636 if (rate <= 52000000)
637 return 52000000;
638 if (rate <= 104000000)
639 return 104000000;
640 if (rate <= 208000000)
641 return 208000000;
642 return -EINVAL;
643 }
644
645 /*
646 * This adjusts a requested rate to the closest exact rate
647 * a certain clock can provide. For a fixed clock it's
648 * mostly clk->rate.
649 */
clk_round_rate(struct clk * clk,unsigned long rate)650 long clk_round_rate(struct clk *clk, unsigned long rate)
651 {
652 /* TODO: get appropriate switches for EMIFCLK, AHBCLK and MCLK */
653 /* Else default to fixed value */
654
655 if (clk->round_rate) {
656 return (long) clk->round_rate(clk, rate);
657 } else {
658 printk(KERN_ERR "clock: Failed to round rate of %s\n",
659 clk->name);
660 }
661 return (long) clk->rate;
662 }
663 EXPORT_SYMBOL(clk_round_rate);
664
clk_set_rate_mclk(struct clk * clk,unsigned long rate)665 static int clk_set_rate_mclk(struct clk *clk, unsigned long rate)
666 {
667 syscon_clk_rate_set_mclk(clk_round_rate(clk, rate));
668 return 0;
669 }
670
clk_set_rate_cpuclk(struct clk * clk,unsigned long rate)671 static int clk_set_rate_cpuclk(struct clk *clk, unsigned long rate)
672 {
673 syscon_clk_rate_set_cpuclk(clk_round_rate(clk, rate));
674 return 0;
675 }
676
clk_set_rate(struct clk * clk,unsigned long rate)677 int clk_set_rate(struct clk *clk, unsigned long rate)
678 {
679 /* TODO: set for EMIFCLK and AHBCLK */
680 /* Else assume the clock is fixed and fail */
681 if (clk->set_rate) {
682 return clk->set_rate(clk, rate);
683 } else {
684 printk(KERN_ERR "clock: Failed to set %s to %ld hz\n",
685 clk->name, rate);
686 return -EINVAL;
687 }
688 }
689 EXPORT_SYMBOL(clk_set_rate);
690
691 /*
692 * Clock definitions. The clock parents are set to respective
693 * bridge and the clock framework makes sure that the clocks have
694 * parents activated and are brought out of reset when in use.
695 *
696 * Clocks that have hw_ctrld = true are hw controlled, and the hw
697 * can by itself turn these clocks on and off.
698 * So in other words, we don't really have to care about them.
699 */
700
701 static struct clk amba_clk = {
702 .name = "AMBA",
703 .rate = 52000000, /* this varies! */
704 .hw_ctrld = true,
705 .reset = false,
706 .lock = __SPIN_LOCK_UNLOCKED(amba_clk.lock),
707 };
708
709 /*
710 * These blocks are connected directly to the AMBA bus
711 * with no bridge.
712 */
713
714 static struct clk cpu_clk = {
715 .name = "CPU",
716 .parent = &amba_clk,
717 .rate = 208000000, /* this varies! */
718 .hw_ctrld = true,
719 .reset = true,
720 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
721 .res_mask = U300_SYSCON_RRR_CPU_RESET_EN,
722 .set_rate = clk_set_rate_cpuclk,
723 .get_rate = clk_get_rate_cpuclk,
724 .round_rate = clk_round_rate_cpuclk,
725 .lock = __SPIN_LOCK_UNLOCKED(cpu_clk.lock),
726 };
727
728 static struct clk nandif_clk = {
729 .name = "FSMC",
730 .parent = &amba_clk,
731 .hw_ctrld = false,
732 .reset = true,
733 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
734 .res_mask = U300_SYSCON_RRR_NANDIF_RESET_EN,
735 .clk_val = U300_SYSCON_SBCER_NANDIF_CLK_EN,
736 .enable = syscon_clk_enable,
737 .disable = syscon_clk_disable,
738 .lock = __SPIN_LOCK_UNLOCKED(nandif_clk.lock),
739 };
740
741 static struct clk semi_clk = {
742 .name = "SEMI",
743 .parent = &amba_clk,
744 .rate = 0, /* FIXME */
745 /* It is not possible to reset SEMI */
746 .hw_ctrld = false,
747 .reset = false,
748 .clk_val = U300_SYSCON_SBCER_SEMI_CLK_EN,
749 .enable = syscon_clk_enable,
750 .disable = syscon_clk_disable,
751 .lock = __SPIN_LOCK_UNLOCKED(semi_clk.lock),
752 };
753
754 #ifdef CONFIG_MACH_U300_BS335
755 static struct clk isp_clk = {
756 .name = "ISP",
757 .parent = &amba_clk,
758 .rate = 0, /* FIXME */
759 .hw_ctrld = false,
760 .reset = true,
761 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
762 .res_mask = U300_SYSCON_RRR_ISP_RESET_EN,
763 .clk_val = U300_SYSCON_SBCER_ISP_CLK_EN,
764 .enable = syscon_clk_enable,
765 .disable = syscon_clk_disable,
766 .lock = __SPIN_LOCK_UNLOCKED(isp_clk.lock),
767 };
768
769 static struct clk cds_clk = {
770 .name = "CDS",
771 .parent = &amba_clk,
772 .rate = 0, /* FIXME */
773 .hw_ctrld = false,
774 .reset = true,
775 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
776 .res_mask = U300_SYSCON_RRR_CDS_RESET_EN,
777 .clk_val = U300_SYSCON_SBCER_CDS_CLK_EN,
778 .enable = syscon_clk_enable,
779 .disable = syscon_clk_disable,
780 .lock = __SPIN_LOCK_UNLOCKED(cds_clk.lock),
781 };
782 #endif
783
784 static struct clk dma_clk = {
785 .name = "DMA",
786 .parent = &amba_clk,
787 .rate = 52000000, /* this varies! */
788 .hw_ctrld = true,
789 .reset = true,
790 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
791 .res_mask = U300_SYSCON_RRR_DMAC_RESET_EN,
792 .clk_val = U300_SYSCON_SBCER_DMAC_CLK_EN,
793 .enable = syscon_clk_enable,
794 .disable = syscon_clk_disable,
795 .lock = __SPIN_LOCK_UNLOCKED(dma_clk.lock),
796 };
797
798 static struct clk aaif_clk = {
799 .name = "AAIF",
800 .parent = &amba_clk,
801 .rate = 52000000, /* this varies! */
802 .hw_ctrld = true,
803 .reset = true,
804 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
805 .res_mask = U300_SYSCON_RRR_AAIF_RESET_EN,
806 .clk_val = U300_SYSCON_SBCER_AAIF_CLK_EN,
807 .enable = syscon_clk_enable,
808 .disable = syscon_clk_disable,
809 .lock = __SPIN_LOCK_UNLOCKED(aaif_clk.lock),
810 };
811
812 static struct clk apex_clk = {
813 .name = "APEX",
814 .parent = &amba_clk,
815 .rate = 0, /* FIXME */
816 .hw_ctrld = true,
817 .reset = true,
818 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
819 .res_mask = U300_SYSCON_RRR_APEX_RESET_EN,
820 .clk_val = U300_SYSCON_SBCER_APEX_CLK_EN,
821 .enable = syscon_clk_enable,
822 .disable = syscon_clk_disable,
823 .lock = __SPIN_LOCK_UNLOCKED(apex_clk.lock),
824 };
825
826 static struct clk video_enc_clk = {
827 .name = "VIDEO_ENC",
828 .parent = &amba_clk,
829 .rate = 208000000, /* this varies! */
830 .hw_ctrld = false,
831 .reset = false,
832 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
833 /* This has XGAM in the name but refers to the video encoder */
834 .res_mask = U300_SYSCON_RRR_XGAM_VC_SYNC_RESET_EN,
835 .clk_val = U300_SYSCON_SBCER_VIDEO_ENC_CLK_EN,
836 .enable = syscon_clk_enable,
837 .disable = syscon_clk_disable,
838 .lock = __SPIN_LOCK_UNLOCKED(video_enc_clk.lock),
839 };
840
841 static struct clk xgam_clk = {
842 .name = "XGAMCLK",
843 .parent = &amba_clk,
844 .rate = 52000000, /* this varies! */
845 .hw_ctrld = false,
846 .reset = true,
847 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
848 .res_mask = U300_SYSCON_RRR_XGAM_RESET_EN,
849 .clk_val = U300_SYSCON_SBCER_XGAM_CLK_EN,
850 .get_rate = clk_get_rate_xgamclk,
851 .enable = syscon_clk_enable,
852 .disable = syscon_clk_disable,
853 .lock = __SPIN_LOCK_UNLOCKED(xgam_clk.lock),
854 };
855
856 /* This clock is used to activate the video encoder */
857 static struct clk ahb_clk = {
858 .name = "AHB",
859 .parent = &amba_clk,
860 .rate = 52000000, /* this varies! */
861 .hw_ctrld = false, /* This one is set to false due to HW bug */
862 .reset = true,
863 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
864 .res_mask = U300_SYSCON_RRR_AHB_RESET_EN,
865 .clk_val = U300_SYSCON_SBCER_AHB_CLK_EN,
866 .enable = syscon_clk_enable,
867 .disable = syscon_clk_disable,
868 .get_rate = clk_get_rate_ahb_clk,
869 .lock = __SPIN_LOCK_UNLOCKED(ahb_clk.lock),
870 };
871
872
873 /*
874 * Clocks on the AHB bridge
875 */
876
877 static struct clk ahb_subsys_clk = {
878 .name = "AHB_SUBSYS",
879 .parent = &amba_clk,
880 .rate = 52000000, /* this varies! */
881 .hw_ctrld = true,
882 .reset = false,
883 .clk_val = U300_SYSCON_SBCER_AHB_SUBSYS_BRIDGE_CLK_EN,
884 .enable = syscon_clk_enable,
885 .disable = syscon_clk_disable,
886 .get_rate = clk_get_rate_ahb_clk,
887 .lock = __SPIN_LOCK_UNLOCKED(ahb_subsys_clk.lock),
888 };
889
890 static struct clk intcon_clk = {
891 .name = "INTCON",
892 .parent = &ahb_subsys_clk,
893 .rate = 52000000, /* this varies! */
894 .hw_ctrld = false,
895 .reset = true,
896 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
897 .res_mask = U300_SYSCON_RRR_INTCON_RESET_EN,
898 /* INTCON can be reset but not clock-gated */
899 .lock = __SPIN_LOCK_UNLOCKED(intcon_clk.lock),
900
901 };
902
903 static struct clk mspro_clk = {
904 .name = "MSPRO",
905 .parent = &ahb_subsys_clk,
906 .rate = 0, /* FIXME */
907 .hw_ctrld = false,
908 .reset = true,
909 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
910 .res_mask = U300_SYSCON_RRR_MSPRO_RESET_EN,
911 .clk_val = U300_SYSCON_SBCER_MSPRO_CLK_EN,
912 .enable = syscon_clk_enable,
913 .disable = syscon_clk_disable,
914 .lock = __SPIN_LOCK_UNLOCKED(mspro_clk.lock),
915 };
916
917 static struct clk emif_clk = {
918 .name = "EMIF",
919 .parent = &ahb_subsys_clk,
920 .rate = 104000000, /* this varies! */
921 .hw_ctrld = false,
922 .reset = true,
923 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RRR,
924 .res_mask = U300_SYSCON_RRR_EMIF_RESET_EN,
925 .clk_val = U300_SYSCON_SBCER_EMIF_CLK_EN,
926 .enable = syscon_clk_enable,
927 .disable = syscon_clk_disable,
928 .get_rate = clk_get_rate_emif_clk,
929 .lock = __SPIN_LOCK_UNLOCKED(emif_clk.lock),
930 };
931
932
933 /*
934 * Clocks on the FAST bridge
935 */
936 static struct clk fast_clk = {
937 .name = "FAST_BRIDGE",
938 .parent = &amba_clk,
939 .rate = 13000000, /* this varies! */
940 .hw_ctrld = true,
941 .reset = true,
942 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
943 .res_mask = U300_SYSCON_RFR_FAST_BRIDGE_RESET_ENABLE,
944 .clk_val = U300_SYSCON_SBCER_FAST_BRIDGE_CLK_EN,
945 .enable = syscon_clk_enable,
946 .disable = syscon_clk_disable,
947 .lock = __SPIN_LOCK_UNLOCKED(fast_clk.lock),
948 };
949
950 /*
951 * The MMCI apb_pclk is hardwired to the same terminal as the
952 * external MCI clock. Thus this will be referenced twice.
953 */
954 static struct clk mmcsd_clk = {
955 .name = "MCLK",
956 .parent = &fast_clk,
957 .rate = 18900000, /* this varies! */
958 .hw_ctrld = false,
959 .reset = true,
960 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
961 .res_mask = U300_SYSCON_RFR_MMC_RESET_ENABLE,
962 .clk_val = U300_SYSCON_SBCER_MMC_CLK_EN,
963 .get_rate = clk_get_rate_mclk,
964 .set_rate = clk_set_rate_mclk,
965 .round_rate = clk_round_rate_mclk,
966 .disable = syscon_clk_disable,
967 .enable = syscon_clk_enable,
968 .lock = __SPIN_LOCK_UNLOCKED(mmcsd_clk.lock),
969 };
970
971 static struct clk i2s0_clk = {
972 .name = "i2s0",
973 .parent = &fast_clk,
974 .rate = 26000000, /* this varies! */
975 .hw_ctrld = true,
976 .reset = true,
977 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
978 .res_mask = U300_SYSCON_RFR_PCM_I2S0_RESET_ENABLE,
979 .clk_val = U300_SYSCON_SBCER_I2S0_CORE_CLK_EN,
980 .enable = syscon_clk_enable,
981 .disable = syscon_clk_disable,
982 .get_rate = clk_get_rate_i2s_i2c_spi,
983 .lock = __SPIN_LOCK_UNLOCKED(i2s0_clk.lock),
984 };
985
986 static struct clk i2s1_clk = {
987 .name = "i2s1",
988 .parent = &fast_clk,
989 .rate = 26000000, /* this varies! */
990 .hw_ctrld = true,
991 .reset = true,
992 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
993 .res_mask = U300_SYSCON_RFR_PCM_I2S1_RESET_ENABLE,
994 .clk_val = U300_SYSCON_SBCER_I2S1_CORE_CLK_EN,
995 .enable = syscon_clk_enable,
996 .disable = syscon_clk_disable,
997 .get_rate = clk_get_rate_i2s_i2c_spi,
998 .lock = __SPIN_LOCK_UNLOCKED(i2s1_clk.lock),
999 };
1000
1001 static struct clk i2c0_clk = {
1002 .name = "I2C0",
1003 .parent = &fast_clk,
1004 .rate = 26000000, /* this varies! */
1005 .hw_ctrld = false,
1006 .reset = true,
1007 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
1008 .res_mask = U300_SYSCON_RFR_I2C0_RESET_ENABLE,
1009 .clk_val = U300_SYSCON_SBCER_I2C0_CLK_EN,
1010 .enable = syscon_clk_enable,
1011 .disable = syscon_clk_disable,
1012 .get_rate = clk_get_rate_i2s_i2c_spi,
1013 .lock = __SPIN_LOCK_UNLOCKED(i2c0_clk.lock),
1014 };
1015
1016 static struct clk i2c1_clk = {
1017 .name = "I2C1",
1018 .parent = &fast_clk,
1019 .rate = 26000000, /* this varies! */
1020 .hw_ctrld = false,
1021 .reset = true,
1022 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
1023 .res_mask = U300_SYSCON_RFR_I2C1_RESET_ENABLE,
1024 .clk_val = U300_SYSCON_SBCER_I2C1_CLK_EN,
1025 .enable = syscon_clk_enable,
1026 .disable = syscon_clk_disable,
1027 .get_rate = clk_get_rate_i2s_i2c_spi,
1028 .lock = __SPIN_LOCK_UNLOCKED(i2c1_clk.lock),
1029 };
1030
1031 /*
1032 * The SPI apb_pclk is hardwired to the same terminal as the
1033 * external SPI clock. Thus this will be referenced twice.
1034 */
1035 static struct clk spi_clk = {
1036 .name = "SPI",
1037 .parent = &fast_clk,
1038 .rate = 26000000, /* this varies! */
1039 .hw_ctrld = false,
1040 .reset = true,
1041 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
1042 .res_mask = U300_SYSCON_RFR_SPI_RESET_ENABLE,
1043 .clk_val = U300_SYSCON_SBCER_SPI_CLK_EN,
1044 .enable = syscon_clk_enable,
1045 .disable = syscon_clk_disable,
1046 .get_rate = clk_get_rate_i2s_i2c_spi,
1047 .lock = __SPIN_LOCK_UNLOCKED(spi_clk.lock),
1048 };
1049
1050 #ifdef CONFIG_MACH_U300_BS335
1051 static struct clk uart1_pclk = {
1052 .name = "UART1_PCLK",
1053 .parent = &fast_clk,
1054 .hw_ctrld = false,
1055 .reset = true,
1056 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RFR,
1057 .res_mask = U300_SYSCON_RFR_UART1_RESET_ENABLE,
1058 .clk_val = U300_SYSCON_SBCER_UART1_CLK_EN,
1059 .enable = syscon_clk_enable,
1060 .disable = syscon_clk_disable,
1061 .lock = __SPIN_LOCK_UNLOCKED(uart1_pclk.lock),
1062 };
1063
1064 /* This one is hardwired to PLL13 */
1065 static struct clk uart1_clk = {
1066 .name = "UART1_CLK",
1067 .rate = 13000000,
1068 .hw_ctrld = true,
1069 .lock = __SPIN_LOCK_UNLOCKED(uart1_clk.lock),
1070 };
1071 #endif
1072
1073
1074 /*
1075 * Clocks on the SLOW bridge
1076 */
1077 static struct clk slow_clk = {
1078 .name = "SLOW_BRIDGE",
1079 .parent = &amba_clk,
1080 .rate = 13000000,
1081 .hw_ctrld = true,
1082 .reset = true,
1083 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1084 .res_mask = U300_SYSCON_RSR_SLOW_BRIDGE_RESET_EN,
1085 .clk_val = U300_SYSCON_SBCER_SLOW_BRIDGE_CLK_EN,
1086 .enable = syscon_clk_enable,
1087 .disable = syscon_clk_disable,
1088 .lock = __SPIN_LOCK_UNLOCKED(slow_clk.lock),
1089 };
1090
1091 /* TODO: implement SYSCON clock? */
1092
1093 static struct clk wdog_clk = {
1094 .name = "WDOG",
1095 .parent = &slow_clk,
1096 .hw_ctrld = false,
1097 .rate = 32768,
1098 .reset = false,
1099 /* This is always on, cannot be enabled/disabled or reset */
1100 .lock = __SPIN_LOCK_UNLOCKED(wdog_clk.lock),
1101 };
1102
1103 static struct clk uart0_pclk = {
1104 .name = "UART0_PCLK",
1105 .parent = &slow_clk,
1106 .hw_ctrld = false,
1107 .reset = true,
1108 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1109 .res_mask = U300_SYSCON_RSR_UART_RESET_EN,
1110 .clk_val = U300_SYSCON_SBCER_UART_CLK_EN,
1111 .enable = syscon_clk_enable,
1112 .disable = syscon_clk_disable,
1113 .lock = __SPIN_LOCK_UNLOCKED(uart0_pclk.lock),
1114 };
1115
1116 /* This one is hardwired to PLL13 */
1117 static struct clk uart0_clk = {
1118 .name = "UART0_CLK",
1119 .parent = &slow_clk,
1120 .rate = 13000000,
1121 .hw_ctrld = true,
1122 .lock = __SPIN_LOCK_UNLOCKED(uart0_clk.lock),
1123 };
1124
1125 static struct clk keypad_clk = {
1126 .name = "KEYPAD",
1127 .parent = &slow_clk,
1128 .rate = 32768,
1129 .hw_ctrld = false,
1130 .reset = true,
1131 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1132 .res_mask = U300_SYSCON_RSR_KEYPAD_RESET_EN,
1133 .clk_val = U300_SYSCON_SBCER_KEYPAD_CLK_EN,
1134 .enable = syscon_clk_enable,
1135 .disable = syscon_clk_disable,
1136 .lock = __SPIN_LOCK_UNLOCKED(keypad_clk.lock),
1137 };
1138
1139 static struct clk gpio_clk = {
1140 .name = "GPIO",
1141 .parent = &slow_clk,
1142 .rate = 13000000,
1143 .hw_ctrld = true,
1144 .reset = true,
1145 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1146 .res_mask = U300_SYSCON_RSR_GPIO_RESET_EN,
1147 .clk_val = U300_SYSCON_SBCER_GPIO_CLK_EN,
1148 .enable = syscon_clk_enable,
1149 .disable = syscon_clk_disable,
1150 .lock = __SPIN_LOCK_UNLOCKED(gpio_clk.lock),
1151 };
1152
1153 static struct clk rtc_clk = {
1154 .name = "RTC",
1155 .parent = &slow_clk,
1156 .rate = 32768,
1157 .hw_ctrld = true,
1158 .reset = true,
1159 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1160 .res_mask = U300_SYSCON_RSR_RTC_RESET_EN,
1161 /* This clock is always on, cannot be enabled/disabled */
1162 .lock = __SPIN_LOCK_UNLOCKED(rtc_clk.lock),
1163 };
1164
1165 static struct clk bustr_clk = {
1166 .name = "BUSTR",
1167 .parent = &slow_clk,
1168 .rate = 13000000,
1169 .hw_ctrld = true,
1170 .reset = true,
1171 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1172 .res_mask = U300_SYSCON_RSR_BTR_RESET_EN,
1173 .clk_val = U300_SYSCON_SBCER_BTR_CLK_EN,
1174 .enable = syscon_clk_enable,
1175 .disable = syscon_clk_disable,
1176 .lock = __SPIN_LOCK_UNLOCKED(bustr_clk.lock),
1177 };
1178
1179 static struct clk evhist_clk = {
1180 .name = "EVHIST",
1181 .parent = &slow_clk,
1182 .rate = 13000000,
1183 .hw_ctrld = true,
1184 .reset = true,
1185 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1186 .res_mask = U300_SYSCON_RSR_EH_RESET_EN,
1187 .clk_val = U300_SYSCON_SBCER_EH_CLK_EN,
1188 .enable = syscon_clk_enable,
1189 .disable = syscon_clk_disable,
1190 .lock = __SPIN_LOCK_UNLOCKED(evhist_clk.lock),
1191 };
1192
1193 static struct clk timer_clk = {
1194 .name = "TIMER",
1195 .parent = &slow_clk,
1196 .rate = 13000000,
1197 .hw_ctrld = true,
1198 .reset = true,
1199 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1200 .res_mask = U300_SYSCON_RSR_ACC_TMR_RESET_EN,
1201 .clk_val = U300_SYSCON_SBCER_ACC_TMR_CLK_EN,
1202 .enable = syscon_clk_enable,
1203 .disable = syscon_clk_disable,
1204 .lock = __SPIN_LOCK_UNLOCKED(timer_clk.lock),
1205 };
1206
1207 /*
1208 * There is a binary divider in the hardware that divides
1209 * the 13MHz PLL by 13 down to 1 MHz.
1210 */
1211 static struct clk app_timer_clk = {
1212 .name = "TIMER_APP",
1213 .parent = &slow_clk,
1214 .rate = 1000000,
1215 .hw_ctrld = true,
1216 .reset = true,
1217 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1218 .res_mask = U300_SYSCON_RSR_APP_TMR_RESET_EN,
1219 .clk_val = U300_SYSCON_SBCER_APP_TMR_CLK_EN,
1220 .enable = syscon_clk_enable,
1221 .disable = syscon_clk_disable,
1222 .lock = __SPIN_LOCK_UNLOCKED(app_timer_clk.lock),
1223 };
1224
1225 #ifdef CONFIG_MACH_U300_BS335
1226 static struct clk ppm_clk = {
1227 .name = "PPM",
1228 .parent = &slow_clk,
1229 .rate = 0, /* FIXME */
1230 .hw_ctrld = true, /* TODO: Look up if it is hw ctrld or not */
1231 .reset = true,
1232 .res_reg = U300_SYSCON_VBASE + U300_SYSCON_RSR,
1233 .res_mask = U300_SYSCON_RSR_PPM_RESET_EN,
1234 .clk_val = U300_SYSCON_SBCER_PPM_CLK_EN,
1235 .enable = syscon_clk_enable,
1236 .disable = syscon_clk_disable,
1237 .lock = __SPIN_LOCK_UNLOCKED(ppm_clk.lock),
1238 };
1239 #endif
1240
1241 #define DEF_LOOKUP(devid, clkref) \
1242 { \
1243 .dev_id = devid, \
1244 .clk = clkref, \
1245 }
1246
1247 #define DEF_LOOKUP_CON(devid, conid, clkref) \
1248 { \
1249 .dev_id = devid, \
1250 .con_id = conid, \
1251 .clk = clkref, \
1252 }
1253
1254 /*
1255 * Here we only define clocks that are meaningful to
1256 * look up through clockdevice.
1257 */
1258 static struct clk_lookup lookups[] = {
1259 /* Connected directly to the AMBA bus */
1260 DEF_LOOKUP("amba", &amba_clk),
1261 DEF_LOOKUP("cpu", &cpu_clk),
1262 DEF_LOOKUP("fsmc-nand", &nandif_clk),
1263 DEF_LOOKUP("semi", &semi_clk),
1264 #ifdef CONFIG_MACH_U300_BS335
1265 DEF_LOOKUP("isp", &isp_clk),
1266 DEF_LOOKUP("cds", &cds_clk),
1267 #endif
1268 DEF_LOOKUP("dma", &dma_clk),
1269 DEF_LOOKUP("msl", &aaif_clk),
1270 DEF_LOOKUP("apex", &apex_clk),
1271 DEF_LOOKUP("video_enc", &video_enc_clk),
1272 DEF_LOOKUP("xgam", &xgam_clk),
1273 DEF_LOOKUP("ahb", &ahb_clk),
1274 /* AHB bridge clocks */
1275 DEF_LOOKUP("ahb_subsys", &ahb_subsys_clk),
1276 DEF_LOOKUP("intcon", &intcon_clk),
1277 DEF_LOOKUP_CON("intcon", "apb_pclk", &intcon_clk),
1278 DEF_LOOKUP("mspro", &mspro_clk),
1279 DEF_LOOKUP("pl172", &emif_clk),
1280 DEF_LOOKUP_CON("pl172", "apb_pclk", &emif_clk),
1281 /* FAST bridge clocks */
1282 DEF_LOOKUP("fast", &fast_clk),
1283 DEF_LOOKUP("mmci", &mmcsd_clk),
1284 DEF_LOOKUP_CON("mmci", "apb_pclk", &mmcsd_clk),
1285 /*
1286 * The .0 and .1 identifiers on these comes from the platform device
1287 * .id field and are assigned when the platform devices are registered.
1288 */
1289 DEF_LOOKUP("i2s.0", &i2s0_clk),
1290 DEF_LOOKUP("i2s.1", &i2s1_clk),
1291 DEF_LOOKUP("stu300.0", &i2c0_clk),
1292 DEF_LOOKUP("stu300.1", &i2c1_clk),
1293 DEF_LOOKUP("pl022", &spi_clk),
1294 DEF_LOOKUP_CON("pl022", "apb_pclk", &spi_clk),
1295 #ifdef CONFIG_MACH_U300_BS335
1296 DEF_LOOKUP("uart1", &uart1_clk),
1297 DEF_LOOKUP_CON("uart1", "apb_pclk", &uart1_pclk),
1298 #endif
1299 /* SLOW bridge clocks */
1300 DEF_LOOKUP("slow", &slow_clk),
1301 DEF_LOOKUP("coh901327_wdog", &wdog_clk),
1302 DEF_LOOKUP("uart0", &uart0_clk),
1303 DEF_LOOKUP_CON("uart0", "apb_pclk", &uart0_pclk),
1304 DEF_LOOKUP("apptimer", &app_timer_clk),
1305 DEF_LOOKUP("coh901461-keypad", &keypad_clk),
1306 DEF_LOOKUP("u300-gpio", &gpio_clk),
1307 DEF_LOOKUP("rtc-coh901331", &rtc_clk),
1308 DEF_LOOKUP("bustr", &bustr_clk),
1309 DEF_LOOKUP("evhist", &evhist_clk),
1310 DEF_LOOKUP("timer", &timer_clk),
1311 #ifdef CONFIG_MACH_U300_BS335
1312 DEF_LOOKUP("ppm", &ppm_clk),
1313 #endif
1314 };
1315
clk_register(void)1316 static void __init clk_register(void)
1317 {
1318 /* Register the lookups */
1319 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
1320 }
1321
1322 #if (defined(CONFIG_DEBUG_FS) && defined(CONFIG_U300_DEBUG))
1323 /*
1324 * The following makes it possible to view the status (especially
1325 * reference count and reset status) for the clocks in the platform
1326 * by looking into the special file <debugfs>/u300_clocks
1327 */
1328
1329 /* A list of all clocks in the platform */
1330 static struct clk *clks[] = {
1331 /* Top node clock for the AMBA bus */
1332 &amba_clk,
1333 /* Connected directly to the AMBA bus */
1334 &cpu_clk,
1335 &nandif_clk,
1336 &semi_clk,
1337 #ifdef CONFIG_MACH_U300_BS335
1338 &isp_clk,
1339 &cds_clk,
1340 #endif
1341 &dma_clk,
1342 &aaif_clk,
1343 &apex_clk,
1344 &video_enc_clk,
1345 &xgam_clk,
1346 &ahb_clk,
1347
1348 /* AHB bridge clocks */
1349 &ahb_subsys_clk,
1350 &intcon_clk,
1351 &mspro_clk,
1352 &emif_clk,
1353 /* FAST bridge clocks */
1354 &fast_clk,
1355 &mmcsd_clk,
1356 &i2s0_clk,
1357 &i2s1_clk,
1358 &i2c0_clk,
1359 &i2c1_clk,
1360 &spi_clk,
1361 #ifdef CONFIG_MACH_U300_BS335
1362 &uart1_clk,
1363 &uart1_pclk,
1364 #endif
1365 /* SLOW bridge clocks */
1366 &slow_clk,
1367 &wdog_clk,
1368 &uart0_clk,
1369 &uart0_pclk,
1370 &app_timer_clk,
1371 &keypad_clk,
1372 &gpio_clk,
1373 &rtc_clk,
1374 &bustr_clk,
1375 &evhist_clk,
1376 &timer_clk,
1377 #ifdef CONFIG_MACH_U300_BS335
1378 &ppm_clk,
1379 #endif
1380 };
1381
u300_clocks_show(struct seq_file * s,void * data)1382 static int u300_clocks_show(struct seq_file *s, void *data)
1383 {
1384 struct clk *clk;
1385 int i;
1386
1387 seq_printf(s, "CLOCK DEVICE RESET STATE\t" \
1388 "ACTIVE\tUSERS\tHW CTRL FREQ\n");
1389 seq_printf(s, "---------------------------------------------" \
1390 "-----------------------------------------\n");
1391 for (i = 0; i < ARRAY_SIZE(clks); i++) {
1392 clk = clks[i];
1393 if (clk != ERR_PTR(-ENOENT)) {
1394 /* Format clock and device name nicely */
1395 char cdp[33];
1396 int chars;
1397
1398 chars = snprintf(&cdp[0], 17, "%s", clk->name);
1399 while (chars < 16) {
1400 cdp[chars] = ' ';
1401 chars++;
1402 }
1403 chars = snprintf(&cdp[16], 17, "%s", clk->dev ?
1404 dev_name(clk->dev) : "N/A");
1405 while (chars < 16) {
1406 cdp[chars+16] = ' ';
1407 chars++;
1408 }
1409 cdp[32] = '\0';
1410 if (clk->get_rate || clk->rate != 0)
1411 seq_printf(s,
1412 "%s%s\t%s\t%d\t%s\t%lu Hz\n",
1413 &cdp[0],
1414 clk->reset ?
1415 "ASSERTED" : "RELEASED",
1416 clk->usecount ? "ON" : "OFF",
1417 clk->usecount,
1418 clk->hw_ctrld ? "YES" : "NO ",
1419 clk_get_rate(clk));
1420 else
1421 seq_printf(s,
1422 "%s%s\t%s\t%d\t%s\t" \
1423 "(unknown rate)\n",
1424 &cdp[0],
1425 clk->reset ?
1426 "ASSERTED" : "RELEASED",
1427 clk->usecount ? "ON" : "OFF",
1428 clk->usecount,
1429 clk->hw_ctrld ? "YES" : "NO ");
1430 }
1431 }
1432 return 0;
1433 }
1434
u300_clocks_open(struct inode * inode,struct file * file)1435 static int u300_clocks_open(struct inode *inode, struct file *file)
1436 {
1437 return single_open(file, u300_clocks_show, NULL);
1438 }
1439
1440 static const struct file_operations u300_clocks_operations = {
1441 .open = u300_clocks_open,
1442 .read = seq_read,
1443 .llseek = seq_lseek,
1444 .release = single_release,
1445 };
1446
init_clk_read_debugfs(void)1447 static int __init init_clk_read_debugfs(void)
1448 {
1449 /* Expose a simple debugfs interface to view all clocks */
1450 (void) debugfs_create_file("u300_clocks", S_IFREG | S_IRUGO,
1451 NULL, NULL,
1452 &u300_clocks_operations);
1453 return 0;
1454 }
1455 /*
1456 * This needs to come in after the core_initcall() for the
1457 * overall clocks, because debugfs is not available until
1458 * the subsystems come up.
1459 */
1460 module_init(init_clk_read_debugfs);
1461 #endif
1462
u300_clock_init(void)1463 int __init u300_clock_init(void)
1464 {
1465 u16 val;
1466
1467 /*
1468 * FIXME: shall all this powermanagement stuff really live here???
1469 */
1470
1471 /* Set system to run at PLL208, max performance, a known state. */
1472 val = readw(U300_SYSCON_VBASE + U300_SYSCON_CCR);
1473 val &= ~U300_SYSCON_CCR_CLKING_PERFORMANCE_MASK;
1474 writew(val, U300_SYSCON_VBASE + U300_SYSCON_CCR);
1475 /* Wait for the PLL208 to lock if not locked in yet */
1476 while (!(readw(U300_SYSCON_VBASE + U300_SYSCON_CSR) &
1477 U300_SYSCON_CSR_PLL208_LOCK_IND));
1478
1479 /* Power management enable */
1480 val = readw(U300_SYSCON_VBASE + U300_SYSCON_PMCR);
1481 val |= U300_SYSCON_PMCR_PWR_MGNT_ENABLE;
1482 writew(val, U300_SYSCON_VBASE + U300_SYSCON_PMCR);
1483
1484 clk_register();
1485
1486 /*
1487 * Some of these may be on when we boot the system so make sure they
1488 * are turned OFF.
1489 */
1490 syscon_block_reset_enable(&timer_clk);
1491 timer_clk.disable(&timer_clk);
1492
1493 /*
1494 * These shall be turned on by default when we boot the system
1495 * so make sure they are ON. (Adding CPU here is a bit too much.)
1496 * These clocks will be claimed by drivers later.
1497 */
1498 syscon_block_reset_disable(&semi_clk);
1499 syscon_block_reset_disable(&emif_clk);
1500 clk_enable(&semi_clk);
1501 clk_enable(&emif_clk);
1502
1503 return 0;
1504 }
1505