Merge branch 'x86/header-guards' into x86-v28-for-linus-phase1
[linux-2.6] / arch / arm / mach-pnx4008 / clock.c
1 /*
2  * arch/arm/mach-pnx4008/clock.c
3  *
4  * Clock control driver for PNX4008
5  *
6  * Authors: Vitaly Wool, Dmitry Chigirev <source@mvista.com>
7  * Generic clock management functions are partially based on:
8  *  linux/arch/arm/mach-omap/clock.c
9  *
10  * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
11  * the terms of the GNU General Public License version 2. This program
12  * is licensed "as is" without any warranty of any kind, whether express
13  * or implied.
14  */
15
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/list.h>
19 #include <linux/errno.h>
20 #include <linux/device.h>
21 #include <linux/err.h>
22 #include <linux/delay.h>
23
24 #include <mach/hardware.h>
25 #include <asm/io.h>
26
27 #include <mach/clock.h>
28 #include "clock.h"
29
30 /*forward declaration*/
31 static struct clk per_ck;
32 static struct clk hclk_ck;
33 static struct clk ck_1MHz;
34 static struct clk ck_13MHz;
35 static struct clk ck_pll1;
36 static int local_set_rate(struct clk *clk, u32 rate);
37
38 static inline void clock_lock(void)
39 {
40         local_irq_disable();
41 }
42
43 static inline void clock_unlock(void)
44 {
45         local_irq_enable();
46 }
47
48 static void propagate_rate(struct clk *clk)
49 {
50         struct clk *tmp_clk;
51
52         tmp_clk = clk;
53         while (tmp_clk->propagate_next) {
54                 tmp_clk = tmp_clk->propagate_next;
55                 local_set_rate(tmp_clk, tmp_clk->user_rate);
56         }
57 }
58
59 static inline void clk_reg_disable(struct clk *clk)
60 {
61         if (clk->enable_reg)
62                 __raw_writel(__raw_readl(clk->enable_reg) &
63                              ~(1 << clk->enable_shift), clk->enable_reg);
64 }
65
66 static inline void clk_reg_enable(struct clk *clk)
67 {
68         if (clk->enable_reg)
69                 __raw_writel(__raw_readl(clk->enable_reg) |
70                              (1 << clk->enable_shift), clk->enable_reg);
71 }
72
73 static inline void clk_reg_disable1(struct clk *clk)
74 {
75         if (clk->enable_reg1)
76                 __raw_writel(__raw_readl(clk->enable_reg1) &
77                              ~(1 << clk->enable_shift1), clk->enable_reg1);
78 }
79
80 static inline void clk_reg_enable1(struct clk *clk)
81 {
82         if (clk->enable_reg1)
83                 __raw_writel(__raw_readl(clk->enable_reg1) |
84                              (1 << clk->enable_shift1), clk->enable_reg1);
85 }
86
87 static int clk_wait_for_pll_lock(struct clk *clk)
88 {
89         int i;
90         i = 0;
91         while (i++ < 0xFFF && !(__raw_readl(clk->scale_reg) & 1)) ;     /*wait for PLL to lock */
92
93         if (!(__raw_readl(clk->scale_reg) & 1)) {
94                 printk(KERN_ERR
95                        "%s ERROR: failed to lock, scale reg data: %x\n",
96                        clk->name, __raw_readl(clk->scale_reg));
97                 return -1;
98         }
99         return 0;
100 }
101
102 static int switch_to_dirty_13mhz(struct clk *clk)
103 {
104         int i;
105         int ret;
106         u32 tmp_reg;
107
108         ret = 0;
109
110         if (!clk->rate)
111                 clk_reg_enable1(clk);
112
113         tmp_reg = __raw_readl(clk->parent_switch_reg);
114         /*if 13Mhz clock selected, select 13'MHz (dirty) source from OSC */
115         if (!(tmp_reg & 1)) {
116                 tmp_reg |= (1 << 1);    /* Trigger switch to 13'MHz (dirty) clock */
117                 __raw_writel(tmp_reg, clk->parent_switch_reg);
118                 i = 0;
119                 while (i++ < 0xFFF && !(__raw_readl(clk->parent_switch_reg) & 1)) ;     /*wait for 13'MHz selection status */
120
121                 if (!(__raw_readl(clk->parent_switch_reg) & 1)) {
122                         printk(KERN_ERR
123                                "%s ERROR: failed to select 13'MHz, parent sw reg data: %x\n",
124                                clk->name, __raw_readl(clk->parent_switch_reg));
125                         ret = -1;
126                 }
127         }
128
129         if (!clk->rate)
130                 clk_reg_disable1(clk);
131
132         return ret;
133 }
134
135 static int switch_to_clean_13mhz(struct clk *clk)
136 {
137         int i;
138         int ret;
139         u32 tmp_reg;
140
141         ret = 0;
142
143         if (!clk->rate)
144                 clk_reg_enable1(clk);
145
146         tmp_reg = __raw_readl(clk->parent_switch_reg);
147         /*if 13'Mhz clock selected, select 13MHz (clean) source from OSC */
148         if (tmp_reg & 1) {
149                 tmp_reg &= ~(1 << 1);   /* Trigger switch to 13MHz (clean) clock */
150                 __raw_writel(tmp_reg, clk->parent_switch_reg);
151                 i = 0;
152                 while (i++ < 0xFFF && (__raw_readl(clk->parent_switch_reg) & 1)) ;      /*wait for 13MHz selection status */
153
154                 if (__raw_readl(clk->parent_switch_reg) & 1) {
155                         printk(KERN_ERR
156                                "%s ERROR: failed to select 13MHz, parent sw reg data: %x\n",
157                                clk->name, __raw_readl(clk->parent_switch_reg));
158                         ret = -1;
159                 }
160         }
161
162         if (!clk->rate)
163                 clk_reg_disable1(clk);
164
165         return ret;
166 }
167
168 static int set_13MHz_parent(struct clk *clk, struct clk *parent)
169 {
170         int ret = -EINVAL;
171
172         if (parent == &ck_13MHz)
173                 ret = switch_to_clean_13mhz(clk);
174         else if (parent == &ck_pll1)
175                 ret = switch_to_dirty_13mhz(clk);
176
177         return ret;
178 }
179
180 #define PLL160_MIN_FCCO 156000
181 #define PLL160_MAX_FCCO 320000
182
183 /*
184  * Calculate pll160 settings.
185  * Possible input: up to 320MHz with step of clk->parent->rate.
186  * In PNX4008 parent rate for pll160s may be either 1 or 13MHz.
187  * Ignored paths: "feedback" (bit 13 set), "div-by-N".
188  * Setting ARM PLL4 rate to 0 will put CPU into direct run mode.
189  * Setting PLL5 and PLL3 rate to 0 will disable USB and DSP clock input.
190  * Please refer to PNX4008 IC manual for details.
191  */
192
193 static int pll160_set_rate(struct clk *clk, u32 rate)
194 {
195         u32 tmp_reg, tmp_m, tmp_2p, i;
196         u32 parent_rate;
197         int ret = -EINVAL;
198
199         parent_rate = clk->parent->rate;
200
201         if (!parent_rate)
202                 goto out;
203
204         /* set direct run for ARM or disable output for others  */
205         clk_reg_disable(clk);
206
207         /* disable source input as well (ignored for ARM) */
208         clk_reg_disable1(clk);
209
210         tmp_reg = __raw_readl(clk->scale_reg);
211         tmp_reg &= ~0x1ffff;    /*clear all settings, power down */
212         __raw_writel(tmp_reg, clk->scale_reg);
213
214         rate -= rate % parent_rate;     /*round down the input */
215
216         if (rate > PLL160_MAX_FCCO)
217                 rate = PLL160_MAX_FCCO;
218
219         if (!rate) {
220                 clk->rate = 0;
221                 ret = 0;
222                 goto out;
223         }
224
225         clk_reg_enable1(clk);
226         tmp_reg = __raw_readl(clk->scale_reg);
227
228         if (rate == parent_rate) {
229                 /*enter direct bypass mode */
230                 tmp_reg |= ((1 << 14) | (1 << 15));
231                 __raw_writel(tmp_reg, clk->scale_reg);
232                 clk->rate = parent_rate;
233                 clk_reg_enable(clk);
234                 ret = 0;
235                 goto out;
236         }
237
238         i = 0;
239         for (tmp_2p = 1; tmp_2p < 16; tmp_2p <<= 1) {
240                 if (rate * tmp_2p >= PLL160_MIN_FCCO)
241                         break;
242                 i++;
243         }
244
245         if (tmp_2p > 1)
246                 tmp_reg |= ((i - 1) << 11);
247         else
248                 tmp_reg |= (1 << 14);   /*direct mode, no divide */
249
250         tmp_m = rate * tmp_2p;
251         tmp_m /= parent_rate;
252
253         tmp_reg |= (tmp_m - 1) << 1;    /*calculate M */
254         tmp_reg |= (1 << 16);   /*power up PLL */
255         __raw_writel(tmp_reg, clk->scale_reg);
256
257         if (clk_wait_for_pll_lock(clk) < 0) {
258                 clk_reg_disable(clk);
259                 clk_reg_disable1(clk);
260
261                 tmp_reg = __raw_readl(clk->scale_reg);
262                 tmp_reg &= ~0x1ffff;    /*clear all settings, power down */
263                 __raw_writel(tmp_reg, clk->scale_reg);
264                 clk->rate = 0;
265                 ret = -EFAULT;
266                 goto out;
267         }
268
269         clk->rate = (tmp_m * parent_rate) / tmp_2p;
270
271         if (clk->flags & RATE_PROPAGATES)
272                 propagate_rate(clk);
273
274         clk_reg_enable(clk);
275         ret = 0;
276
277 out:
278         return ret;
279 }
280
281 /*configure PER_CLK*/
282 static int per_clk_set_rate(struct clk *clk, u32 rate)
283 {
284         u32 tmp;
285
286         tmp = __raw_readl(clk->scale_reg);
287         tmp &= ~(0x1f << 2);
288         tmp |= ((clk->parent->rate / clk->rate) - 1) << 2;
289         __raw_writel(tmp, clk->scale_reg);
290         clk->rate = rate;
291         return 0;
292 }
293
294 /*configure HCLK*/
295 static int hclk_set_rate(struct clk *clk, u32 rate)
296 {
297         u32 tmp;
298         tmp = __raw_readl(clk->scale_reg);
299         tmp = tmp & ~0x3;
300         switch (rate) {
301         case 1:
302                 break;
303         case 2:
304                 tmp |= 1;
305                 break;
306         case 4:
307                 tmp |= 2;
308                 break;
309         }
310
311         __raw_writel(tmp, clk->scale_reg);
312         clk->rate = rate;
313         return 0;
314 }
315
316 static u32 hclk_round_rate(struct clk *clk, u32 rate)
317 {
318         switch (rate) {
319         case 1:
320         case 4:
321                 return rate;
322         }
323         return 2;
324 }
325
326 static u32 per_clk_round_rate(struct clk *clk, u32 rate)
327 {
328         return CLK_RATE_13MHZ;
329 }
330
331 static int on_off_set_rate(struct clk *clk, u32 rate)
332 {
333         if (rate) {
334                 clk_reg_enable(clk);
335                 clk->rate = 1;
336         } else {
337                 clk_reg_disable(clk);
338                 clk->rate = 0;
339         }
340         return 0;
341 }
342
343 static int on_off_inv_set_rate(struct clk *clk, u32 rate)
344 {
345         if (rate) {
346                 clk_reg_disable(clk);   /*enable bit is inverted */
347                 clk->rate = 1;
348         } else {
349                 clk_reg_enable(clk);
350                 clk->rate = 0;
351         }
352         return 0;
353 }
354
355 static u32 on_off_round_rate(struct clk *clk, u32 rate)
356 {
357         return (rate ? 1 : 0);
358 }
359
360 static u32 pll4_round_rate(struct clk *clk, u32 rate)
361 {
362         if (rate > CLK_RATE_208MHZ)
363                 rate = CLK_RATE_208MHZ;
364         if (rate == CLK_RATE_208MHZ && hclk_ck.user_rate == 1)
365                 rate = CLK_RATE_208MHZ - CLK_RATE_13MHZ;
366         return (rate - (rate % (hclk_ck.user_rate * CLK_RATE_13MHZ)));
367 }
368
369 static u32 pll3_round_rate(struct clk *clk, u32 rate)
370 {
371         if (rate > CLK_RATE_208MHZ)
372                 rate = CLK_RATE_208MHZ;
373         return (rate - rate % CLK_RATE_13MHZ);
374 }
375
376 static u32 pll5_round_rate(struct clk *clk, u32 rate)
377 {
378         return (rate ? CLK_RATE_48MHZ : 0);
379 }
380
381 static u32 ck_13MHz_round_rate(struct clk *clk, u32 rate)
382 {
383         return (rate ? CLK_RATE_13MHZ : 0);
384 }
385
386 static int ck_13MHz_set_rate(struct clk *clk, u32 rate)
387 {
388         if (rate) {
389                 clk_reg_disable(clk);   /*enable bit is inverted */
390                 udelay(500);
391                 clk->rate = CLK_RATE_13MHZ;
392                 ck_1MHz.rate = CLK_RATE_1MHZ;
393         } else {
394                 clk_reg_enable(clk);
395                 clk->rate = 0;
396                 ck_1MHz.rate = 0;
397         }
398         return 0;
399 }
400
401 static int pll1_set_rate(struct clk *clk, u32 rate)
402 {
403 #if 0 /* doesn't work on some boards, probably a HW BUG */
404         if (rate) {
405                 clk_reg_disable(clk);   /*enable bit is inverted */
406                 if (!clk_wait_for_pll_lock(clk)) {
407                         clk->rate = CLK_RATE_13MHZ;
408                 } else {
409                         clk_reg_enable(clk);
410                         clk->rate = 0;
411                 }
412
413         } else {
414                 clk_reg_enable(clk);
415                 clk->rate = 0;
416         }
417 #endif
418         return 0;
419 }
420
421 /* Clock sources */
422
423 static struct clk osc_13MHz = {
424         .name = "osc_13MHz",
425         .flags = FIXED_RATE,
426         .rate = CLK_RATE_13MHZ,
427 };
428
429 static struct clk ck_13MHz = {
430         .name = "ck_13MHz",
431         .parent = &osc_13MHz,
432         .flags = NEEDS_INITIALIZATION,
433         .round_rate = &ck_13MHz_round_rate,
434         .set_rate = &ck_13MHz_set_rate,
435         .enable_reg = OSC13CTRL_REG,
436         .enable_shift = 0,
437         .rate = CLK_RATE_13MHZ,
438 };
439
440 static struct clk osc_32KHz = {
441         .name = "osc_32KHz",
442         .flags = FIXED_RATE,
443         .rate = CLK_RATE_32KHZ,
444 };
445
446 /*attached to PLL5*/
447 static struct clk ck_1MHz = {
448         .name = "ck_1MHz",
449         .flags = FIXED_RATE | PARENT_SET_RATE,
450         .parent = &ck_13MHz,
451 };
452
453 /* PLL1 (397) - provides 13' MHz clock */
454 static struct clk ck_pll1 = {
455         .name = "ck_pll1",
456         .parent = &osc_32KHz,
457         .flags = NEEDS_INITIALIZATION,
458         .round_rate = &ck_13MHz_round_rate,
459         .set_rate = &pll1_set_rate,
460         .enable_reg = PLLCTRL_REG,
461         .enable_shift = 1,
462         .scale_reg = PLLCTRL_REG,
463         .rate = CLK_RATE_13MHZ,
464 };
465
466 /* CPU/Bus PLL */
467 static struct clk ck_pll4 = {
468         .name = "ck_pll4",
469         .parent = &ck_pll1,
470         .flags = RATE_PROPAGATES | NEEDS_INITIALIZATION,
471         .propagate_next = &per_ck,
472         .round_rate = &pll4_round_rate,
473         .set_rate = &pll160_set_rate,
474         .rate = CLK_RATE_208MHZ,
475         .scale_reg = HCLKPLLCTRL_REG,
476         .enable_reg = PWRCTRL_REG,
477         .enable_shift = 2,
478         .parent_switch_reg = SYSCLKCTRL_REG,
479         .set_parent = &set_13MHz_parent,
480 };
481
482 /* USB PLL */
483 static struct clk ck_pll5 = {
484         .name = "ck_pll5",
485         .parent = &ck_1MHz,
486         .flags = NEEDS_INITIALIZATION,
487         .round_rate = &pll5_round_rate,
488         .set_rate = &pll160_set_rate,
489         .scale_reg = USBCTRL_REG,
490         .enable_reg = USBCTRL_REG,
491         .enable_shift = 18,
492         .enable_reg1 = USBCTRL_REG,
493         .enable_shift1 = 17,
494 };
495
496 /* XPERTTeak DSP PLL */
497 static struct clk ck_pll3 = {
498         .name = "ck_pll3",
499         .parent = &ck_pll1,
500         .flags = NEEDS_INITIALIZATION,
501         .round_rate = &pll3_round_rate,
502         .set_rate = &pll160_set_rate,
503         .scale_reg = DSPPLLCTRL_REG,
504         .enable_reg = DSPCLKCTRL_REG,
505         .enable_shift = 3,
506         .enable_reg1 = DSPCLKCTRL_REG,
507         .enable_shift1 = 2,
508         .parent_switch_reg = DSPCLKCTRL_REG,
509         .set_parent = &set_13MHz_parent,
510 };
511
512 static struct clk hclk_ck = {
513         .name = "hclk_ck",
514         .parent = &ck_pll4,
515         .flags = PARENT_SET_RATE,
516         .set_rate = &hclk_set_rate,
517         .round_rate = &hclk_round_rate,
518         .scale_reg = HCLKDIVCTRL_REG,
519         .rate = 2,
520         .user_rate = 2,
521 };
522
523 static struct clk per_ck = {
524         .name = "per_ck",
525         .parent = &ck_pll4,
526         .flags = FIXED_RATE,
527         .propagate_next = &hclk_ck,
528         .set_rate = &per_clk_set_rate,
529         .round_rate = &per_clk_round_rate,
530         .scale_reg = HCLKDIVCTRL_REG,
531         .rate = CLK_RATE_13MHZ,
532         .user_rate = CLK_RATE_13MHZ,
533 };
534
535 static struct clk m2hclk_ck = {
536         .name = "m2hclk_ck",
537         .parent = &hclk_ck,
538         .flags = NEEDS_INITIALIZATION,
539         .round_rate = &on_off_round_rate,
540         .set_rate = &on_off_inv_set_rate,
541         .rate = 1,
542         .enable_shift = 6,
543         .enable_reg = PWRCTRL_REG,
544 };
545
546 static struct clk vfp9_ck = {
547         .name = "vfp9_ck",
548         .parent = &ck_pll4,
549         .flags = NEEDS_INITIALIZATION,
550         .round_rate = &on_off_round_rate,
551         .set_rate = &on_off_set_rate,
552         .rate = 1,
553         .enable_shift = 4,
554         .enable_reg = VFP9CLKCTRL_REG,
555 };
556
557 static struct clk keyscan_ck = {
558         .name = "keyscan_ck",
559         .parent = &osc_32KHz,
560         .flags = NEEDS_INITIALIZATION,
561         .round_rate = &on_off_round_rate,
562         .set_rate = &on_off_set_rate,
563         .enable_shift = 0,
564         .enable_reg = KEYCLKCTRL_REG,
565 };
566
567 static struct clk touch_ck = {
568         .name = "touch_ck",
569         .parent = &osc_32KHz,
570         .flags = NEEDS_INITIALIZATION,
571         .round_rate = &on_off_round_rate,
572         .set_rate = &on_off_set_rate,
573         .enable_shift = 0,
574         .enable_reg = TSCLKCTRL_REG,
575 };
576
577 static struct clk pwm1_ck = {
578         .name = "pwm1_ck",
579         .parent = &osc_32KHz,
580         .flags = NEEDS_INITIALIZATION,
581         .round_rate = &on_off_round_rate,
582         .set_rate = &on_off_set_rate,
583         .enable_shift = 0,
584         .enable_reg = PWMCLKCTRL_REG,
585 };
586
587 static struct clk pwm2_ck = {
588         .name = "pwm2_ck",
589         .parent = &osc_32KHz,
590         .flags = NEEDS_INITIALIZATION,
591         .round_rate = &on_off_round_rate,
592         .set_rate = &on_off_set_rate,
593         .enable_shift = 2,
594         .enable_reg = PWMCLKCTRL_REG,
595 };
596
597 static struct clk jpeg_ck = {
598         .name = "jpeg_ck",
599         .parent = &hclk_ck,
600         .flags = NEEDS_INITIALIZATION,
601         .round_rate = &on_off_round_rate,
602         .set_rate = &on_off_set_rate,
603         .enable_shift = 0,
604         .enable_reg = JPEGCLKCTRL_REG,
605 };
606
607 static struct clk ms_ck = {
608         .name = "ms_ck",
609         .parent = &ck_pll4,
610         .flags = NEEDS_INITIALIZATION,
611         .round_rate = &on_off_round_rate,
612         .set_rate = &on_off_set_rate,
613         .enable_shift = 5,
614         .enable_reg = MSCTRL_REG,
615 };
616
617 static struct clk dum_ck = {
618         .name = "dum_ck",
619         .parent = &hclk_ck,
620         .flags = NEEDS_INITIALIZATION,
621         .round_rate = &on_off_round_rate,
622         .set_rate = &on_off_set_rate,
623         .enable_shift = 0,
624         .enable_reg = DUMCLKCTRL_REG,
625 };
626
627 static struct clk flash_ck = {
628         .name = "flash_ck",
629         .parent = &hclk_ck,
630         .round_rate = &on_off_round_rate,
631         .set_rate = &on_off_set_rate,
632         .enable_shift = 1,      /* Only MLC clock supported */
633         .enable_reg = FLASHCLKCTRL_REG,
634 };
635
636 static struct clk i2c0_ck = {
637         .name = "i2c0_ck",
638         .parent = &per_ck,
639         .flags = NEEDS_INITIALIZATION,
640         .round_rate = &on_off_round_rate,
641         .set_rate = &on_off_set_rate,
642         .enable_shift = 0,
643         .enable_reg = I2CCLKCTRL_REG,
644 };
645
646 static struct clk i2c1_ck = {
647         .name = "i2c1_ck",
648         .parent = &per_ck,
649         .flags = NEEDS_INITIALIZATION,
650         .round_rate = &on_off_round_rate,
651         .set_rate = &on_off_set_rate,
652         .enable_shift = 1,
653         .enable_reg = I2CCLKCTRL_REG,
654 };
655
656 static struct clk i2c2_ck = {
657         .name = "i2c2_ck",
658         .parent = &per_ck,
659         .flags = NEEDS_INITIALIZATION,
660         .round_rate = &on_off_round_rate,
661         .set_rate = &on_off_set_rate,
662         .enable_shift = 2,
663         .enable_reg = USB_OTG_CLKCTRL_REG,
664 };
665
666 static struct clk spi0_ck = {
667         .name = "spi0_ck",
668         .parent = &hclk_ck,
669         .flags = NEEDS_INITIALIZATION,
670         .round_rate = &on_off_round_rate,
671         .set_rate = &on_off_set_rate,
672         .enable_shift = 0,
673         .enable_reg = SPICTRL_REG,
674 };
675
676 static struct clk spi1_ck = {
677         .name = "spi1_ck",
678         .parent = &hclk_ck,
679         .flags = NEEDS_INITIALIZATION,
680         .round_rate = &on_off_round_rate,
681         .set_rate = &on_off_set_rate,
682         .enable_shift = 4,
683         .enable_reg = SPICTRL_REG,
684 };
685
686 static struct clk dma_ck = {
687         .name = "dma_ck",
688         .parent = &hclk_ck,
689         .round_rate = &on_off_round_rate,
690         .set_rate = &on_off_set_rate,
691         .enable_shift = 0,
692         .enable_reg = DMACLKCTRL_REG,
693 };
694
695 static struct clk uart3_ck = {
696         .name = "uart3_ck",
697         .parent = &per_ck,
698         .flags = NEEDS_INITIALIZATION,
699         .round_rate = &on_off_round_rate,
700         .set_rate = &on_off_set_rate,
701         .rate = 1,
702         .enable_shift = 0,
703         .enable_reg = UARTCLKCTRL_REG,
704 };
705
706 static struct clk uart4_ck = {
707         .name = "uart4_ck",
708         .parent = &per_ck,
709         .flags = NEEDS_INITIALIZATION,
710         .round_rate = &on_off_round_rate,
711         .set_rate = &on_off_set_rate,
712         .enable_shift = 1,
713         .enable_reg = UARTCLKCTRL_REG,
714 };
715
716 static struct clk uart5_ck = {
717         .name = "uart5_ck",
718         .parent = &per_ck,
719         .flags = NEEDS_INITIALIZATION,
720         .round_rate = &on_off_round_rate,
721         .set_rate = &on_off_set_rate,
722         .rate = 1,
723         .enable_shift = 2,
724         .enable_reg = UARTCLKCTRL_REG,
725 };
726
727 static struct clk uart6_ck = {
728         .name = "uart6_ck",
729         .parent = &per_ck,
730         .flags = NEEDS_INITIALIZATION,
731         .round_rate = &on_off_round_rate,
732         .set_rate = &on_off_set_rate,
733         .enable_shift = 3,
734         .enable_reg = UARTCLKCTRL_REG,
735 };
736
737 static struct clk wdt_ck = {
738         .name = "wdt_ck",
739         .parent = &per_ck,
740         .flags = NEEDS_INITIALIZATION,
741         .round_rate = &on_off_round_rate,
742         .set_rate = &on_off_set_rate,
743         .enable_shift = 0,
744         .enable_reg = TIMCLKCTRL_REG,
745 };
746
747 /* These clocks are visible outside this module
748  * and can be initialized
749  */
750 static struct clk *onchip_clks[] = {
751         &ck_13MHz,
752         &ck_pll1,
753         &ck_pll4,
754         &ck_pll5,
755         &ck_pll3,
756         &vfp9_ck,
757         &m2hclk_ck,
758         &hclk_ck,
759         &dma_ck,
760         &flash_ck,
761         &dum_ck,
762         &keyscan_ck,
763         &pwm1_ck,
764         &pwm2_ck,
765         &jpeg_ck,
766         &ms_ck,
767         &touch_ck,
768         &i2c0_ck,
769         &i2c1_ck,
770         &i2c2_ck,
771         &spi0_ck,
772         &spi1_ck,
773         &uart3_ck,
774         &uart4_ck,
775         &uart5_ck,
776         &uart6_ck,
777         &wdt_ck,
778 };
779
780 static int local_clk_enable(struct clk *clk)
781 {
782         int ret = 0;
783
784         if (!(clk->flags & FIXED_RATE) && !clk->rate && clk->set_rate
785             && clk->user_rate)
786                 ret = clk->set_rate(clk, clk->user_rate);
787         return ret;
788 }
789
790 static void local_clk_disable(struct clk *clk)
791 {
792         if (!(clk->flags & FIXED_RATE) && clk->rate && clk->set_rate)
793                 clk->set_rate(clk, 0);
794 }
795
796 static void local_clk_unuse(struct clk *clk)
797 {
798         if (clk->usecount > 0 && !(--clk->usecount)) {
799                 local_clk_disable(clk);
800                 if (clk->parent)
801                         local_clk_unuse(clk->parent);
802         }
803 }
804
805 static int local_clk_use(struct clk *clk)
806 {
807         int ret = 0;
808         if (clk->usecount++ == 0) {
809                 if (clk->parent)
810                         ret = local_clk_use(clk->parent);
811
812                 if (ret != 0) {
813                         clk->usecount--;
814                         goto out;
815                 }
816
817                 ret = local_clk_enable(clk);
818
819                 if (ret != 0 && clk->parent) {
820                         local_clk_unuse(clk->parent);
821                         clk->usecount--;
822                 }
823         }
824 out:
825         return ret;
826 }
827
828 static int local_set_rate(struct clk *clk, u32 rate)
829 {
830         int ret = -EINVAL;
831         if (clk->set_rate) {
832
833                 if (clk->user_rate == clk->rate && clk->parent->rate) {
834                         /* if clock enabled or rate not set */
835                         clk->user_rate = clk->round_rate(clk, rate);
836                         ret = clk->set_rate(clk, clk->user_rate);
837                 } else
838                         clk->user_rate = clk->round_rate(clk, rate);
839                 ret = 0;
840         }
841         return ret;
842 }
843
844 int clk_set_rate(struct clk *clk, unsigned long rate)
845 {
846         int ret = -EINVAL;
847
848         if (clk->flags & FIXED_RATE)
849                 goto out;
850
851         clock_lock();
852         if ((clk->flags & PARENT_SET_RATE) && clk->parent) {
853
854                 clk->user_rate = clk->round_rate(clk, rate);
855                 /* parent clock needs to be refreshed
856                    for the setting to take effect */
857         } else {
858                 ret = local_set_rate(clk, rate);
859         }
860         ret = 0;
861         clock_unlock();
862
863 out:
864         return ret;
865 }
866
867 EXPORT_SYMBOL(clk_set_rate);
868
869 struct clk *clk_get(struct device *dev, const char *id)
870 {
871         struct clk *clk = ERR_PTR(-ENOENT);
872         struct clk **clkp;
873
874         clock_lock();
875         for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
876              clkp++) {
877                 if (strcmp(id, (*clkp)->name) == 0
878                     && try_module_get((*clkp)->owner)) {
879                         clk = (*clkp);
880                         break;
881                 }
882         }
883         clock_unlock();
884
885         return clk;
886 }
887 EXPORT_SYMBOL(clk_get);
888
889 void clk_put(struct clk *clk)
890 {
891         clock_lock();
892         if (clk && !IS_ERR(clk))
893                 module_put(clk->owner);
894         clock_unlock();
895 }
896 EXPORT_SYMBOL(clk_put);
897
898 unsigned long clk_get_rate(struct clk *clk)
899 {
900         unsigned long ret;
901         clock_lock();
902         ret = clk->rate;
903         clock_unlock();
904         return ret;
905 }
906 EXPORT_SYMBOL(clk_get_rate);
907
908 int clk_enable(struct clk *clk)
909 {
910         int ret = 0;
911
912         clock_lock();
913         ret = local_clk_use(clk);
914         clock_unlock();
915         return ret;
916 }
917
918 EXPORT_SYMBOL(clk_enable);
919
920 void clk_disable(struct clk *clk)
921 {
922         clock_lock();
923         local_clk_unuse(clk);
924         clock_unlock();
925 }
926
927 EXPORT_SYMBOL(clk_disable);
928
929 long clk_round_rate(struct clk *clk, unsigned long rate)
930 {
931         long ret;
932         clock_lock();
933         if (clk->round_rate)
934                 ret = clk->round_rate(clk, rate);
935         else
936                 ret = clk->rate;
937         clock_unlock();
938         return ret;
939 }
940
941 EXPORT_SYMBOL(clk_round_rate);
942
943 int clk_set_parent(struct clk *clk, struct clk *parent)
944 {
945         int ret = -ENODEV;
946         if (!clk->set_parent)
947                 goto out;
948
949         clock_lock();
950         ret = clk->set_parent(clk, parent);
951         if (!ret)
952                 clk->parent = parent;
953         clock_unlock();
954
955 out:
956         return ret;
957 }
958
959 EXPORT_SYMBOL(clk_set_parent);
960
961 static int __init clk_init(void)
962 {
963         struct clk **clkp;
964
965         /* Disable autoclocking, as it doesn't seem to work */
966         __raw_writel(0xff, AUTOCLK_CTRL);
967
968         for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
969              clkp++) {
970                 if (((*clkp)->flags & NEEDS_INITIALIZATION)
971                     && ((*clkp)->set_rate)) {
972                         (*clkp)->user_rate = (*clkp)->rate;
973                         local_set_rate((*clkp), (*clkp)->user_rate);
974                         if ((*clkp)->set_parent)
975                                 (*clkp)->set_parent((*clkp), (*clkp)->parent);
976                 }
977                 pr_debug("%s: clock %s, rate %ld\n",
978                         __func__, (*clkp)->name, (*clkp)->rate);
979         }
980
981         local_clk_use(&ck_pll4);
982
983         /* if ck_13MHz is not used, disable it. */
984         if (ck_13MHz.usecount == 0)
985                 local_clk_disable(&ck_13MHz);
986
987         /* Disable autoclocking */
988         __raw_writeb(0xff, AUTOCLK_CTRL);
989
990         return 0;
991 }
992
993 arch_initcall(clk_init);