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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / arch / arm / mach-s3c24xx / clock-s3c2412.c
blob11b3b28457bbce9130309d876f9239905f82e7e2
1 /* linux/arch/arm/mach-s3c2412/clock.c
2 *
3 * Copyright (c) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2412,S3C2413 Clock control support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include <linux/init.h>
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/list.h>
27 #include <linux/errno.h>
28 #include <linux/err.h>
29 #include <linux/device.h>
30 #include <linux/clk.h>
31 #include <linux/mutex.h>
32 #include <linux/delay.h>
33 #include <linux/serial_core.h>
34 #include <linux/io.h>
35
36 #include <asm/mach/map.h>
37
38 #include <mach/hardware.h>
39
40 #include <plat/regs-serial.h>
41 #include <mach/regs-clock.h>
42 #include <mach/regs-gpio.h>
43
44 #include <plat/clock.h>
45 #include <plat/cpu.h>
46
47 /* We currently have to assume that the system is running
48 * from the XTPll input, and that all ***REFCLKs are being
49 * fed from it, as we cannot read the state of OM[4] from
50 * software.
51 *
52 * It would be possible for each board initialisation to
53 * set the correct muxing at initialisation
54 */
55
56 static int s3c2412_clkcon_enable(struct clk *clk, int enable)
57 {
58 unsigned int clocks = clk->ctrlbit;
59 unsigned long clkcon;
60
61 clkcon = __raw_readl(S3C2410_CLKCON);
62
63 if (enable)
64 clkcon |= clocks;
65 else
66 clkcon &= ~clocks;
67
68 __raw_writel(clkcon, S3C2410_CLKCON);
69
70 return 0;
71 }
72
73 static int s3c2412_upll_enable(struct clk *clk, int enable)
74 {
75 unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
76 unsigned long orig = upllcon;
77
78 if (!enable)
79 upllcon |= S3C2412_PLLCON_OFF;
80 else
81 upllcon &= ~S3C2412_PLLCON_OFF;
82
83 __raw_writel(upllcon, S3C2410_UPLLCON);
84
85 /* allow ~150uS for the PLL to settle and lock */
86
87 if (enable && (orig & S3C2412_PLLCON_OFF))
88 udelay(150);
89
90 return 0;
91 }
92
93 /* clock selections */
94
95 static struct clk clk_erefclk = {
96 .name = "erefclk",
97 };
98
99 static struct clk clk_urefclk = {
100 .name = "urefclk",
101 };
102
103 static int s3c2412_setparent_usysclk(struct clk *clk, struct clk *parent)
104 {
105 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
106
107 if (parent == &clk_urefclk)
108 clksrc &= ~S3C2412_CLKSRC_USYSCLK_UPLL;
109 else if (parent == &clk_upll)
110 clksrc |= S3C2412_CLKSRC_USYSCLK_UPLL;
111 else
112 return -EINVAL;
113
114 clk->parent = parent;
115
116 __raw_writel(clksrc, S3C2412_CLKSRC);
117 return 0;
118 }
119
120 static struct clk clk_usysclk = {
121 .name = "usysclk",
122 .parent = &clk_xtal,
123 .ops = &(struct clk_ops) {
124 .set_parent = s3c2412_setparent_usysclk,
125 },
126 };
127
128 static struct clk clk_mrefclk = {
129 .name = "mrefclk",
130 .parent = &clk_xtal,
131 };
132
133 static struct clk clk_mdivclk = {
134 .name = "mdivclk",
135 .parent = &clk_xtal,
136 };
137
138 static int s3c2412_setparent_usbsrc(struct clk *clk, struct clk *parent)
139 {
140 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
141
142 if (parent == &clk_usysclk)
143 clksrc &= ~S3C2412_CLKSRC_USBCLK_HCLK;
144 else if (parent == &clk_h)
145 clksrc |= S3C2412_CLKSRC_USBCLK_HCLK;
146 else
147 return -EINVAL;
148
149 clk->parent = parent;
150
151 __raw_writel(clksrc, S3C2412_CLKSRC);
152 return 0;
153 }
154
155 static unsigned long s3c2412_roundrate_usbsrc(struct clk *clk,
156 unsigned long rate)
157 {
158 unsigned long parent_rate = clk_get_rate(clk->parent);
159 int div;
160
161 if (rate > parent_rate)
162 return parent_rate;
163
164 div = parent_rate / rate;
165 if (div > 2)
166 div = 2;
167
168 return parent_rate / div;
169 }
170
171 static unsigned long s3c2412_getrate_usbsrc(struct clk *clk)
172 {
173 unsigned long parent_rate = clk_get_rate(clk->parent);
174 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
175
176 return parent_rate / ((div & S3C2412_CLKDIVN_USB48DIV) ? 2 : 1);
177 }
178
179 static int s3c2412_setrate_usbsrc(struct clk *clk, unsigned long rate)
180 {
181 unsigned long parent_rate = clk_get_rate(clk->parent);
182 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
183
184 rate = s3c2412_roundrate_usbsrc(clk, rate);
185
186 if ((parent_rate / rate) == 2)
187 clkdivn |= S3C2412_CLKDIVN_USB48DIV;
188 else
189 clkdivn &= ~S3C2412_CLKDIVN_USB48DIV;
190
191 __raw_writel(clkdivn, S3C2410_CLKDIVN);
192 return 0;
193 }
194
195 static struct clk clk_usbsrc = {
196 .name = "usbsrc",
197 .ops = &(struct clk_ops) {
198 .get_rate = s3c2412_getrate_usbsrc,
199 .set_rate = s3c2412_setrate_usbsrc,
200 .round_rate = s3c2412_roundrate_usbsrc,
201 .set_parent = s3c2412_setparent_usbsrc,
202 },
203 };
204
205 static int s3c2412_setparent_msysclk(struct clk *clk, struct clk *parent)
206 {
207 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
208
209 if (parent == &clk_mdivclk)
210 clksrc &= ~S3C2412_CLKSRC_MSYSCLK_MPLL;
211 else if (parent == &clk_mpll)
212 clksrc |= S3C2412_CLKSRC_MSYSCLK_MPLL;
213 else
214 return -EINVAL;
215
216 clk->parent = parent;
217
218 __raw_writel(clksrc, S3C2412_CLKSRC);
219 return 0;
220 }
221
222 static struct clk clk_msysclk = {
223 .name = "msysclk",
224 .ops = &(struct clk_ops) {
225 .set_parent = s3c2412_setparent_msysclk,
226 },
227 };
228
229 static int s3c2412_setparent_armclk(struct clk *clk, struct clk *parent)
230 {
231 unsigned long flags;
232 unsigned long clkdiv;
233 unsigned long dvs;
234
235 /* Note, we current equate fclk andf msysclk for S3C2412 */
236
237 if (parent == &clk_msysclk || parent == &clk_f)
238 dvs = 0;
239 else if (parent == &clk_h)
240 dvs = S3C2412_CLKDIVN_DVSEN;
241 else
242 return -EINVAL;
243
244 clk->parent = parent;
245
246 /* update this under irq lockdown, clkdivn is not protected
247 * by the clock system. */
248
249 local_irq_save(flags);
250
251 clkdiv = __raw_readl(S3C2410_CLKDIVN);
252 clkdiv &= ~S3C2412_CLKDIVN_DVSEN;
253 clkdiv |= dvs;
254 __raw_writel(clkdiv, S3C2410_CLKDIVN);
255
256 local_irq_restore(flags);
257
258 return 0;
259 }
260
261 static struct clk clk_armclk = {
262 .name = "armclk",
263 .parent = &clk_msysclk,
264 .ops = &(struct clk_ops) {
265 .set_parent = s3c2412_setparent_armclk,
266 },
267 };
268
269 /* these next clocks have an divider immediately after them,
270 * so we can register them with their divider and leave out the
271 * intermediate clock stage
272 */
273 static unsigned long s3c2412_roundrate_clksrc(struct clk *clk,
274 unsigned long rate)
275 {
276 unsigned long parent_rate = clk_get_rate(clk->parent);
277 int div;
278
279 if (rate > parent_rate)
280 return parent_rate;
281
282 /* note, we remove the +/- 1 calculations as they cancel out */
283
284 div = (rate / parent_rate);
285
286 if (div < 1)
287 div = 1;
288 else if (div > 16)
289 div = 16;
290
291 return parent_rate / div;
292 }
293
294 static int s3c2412_setparent_uart(struct clk *clk, struct clk *parent)
295 {
296 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
297
298 if (parent == &clk_erefclk)
299 clksrc &= ~S3C2412_CLKSRC_UARTCLK_MPLL;
300 else if (parent == &clk_mpll)
301 clksrc |= S3C2412_CLKSRC_UARTCLK_MPLL;
302 else
303 return -EINVAL;
304
305 clk->parent = parent;
306
307 __raw_writel(clksrc, S3C2412_CLKSRC);
308 return 0;
309 }
310
311 static unsigned long s3c2412_getrate_uart(struct clk *clk)
312 {
313 unsigned long parent_rate = clk_get_rate(clk->parent);
314 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
315
316 div &= S3C2412_CLKDIVN_UARTDIV_MASK;
317 div >>= S3C2412_CLKDIVN_UARTDIV_SHIFT;
318
319 return parent_rate / (div + 1);
320 }
321
322 static int s3c2412_setrate_uart(struct clk *clk, unsigned long rate)
323 {
324 unsigned long parent_rate = clk_get_rate(clk->parent);
325 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
326
327 rate = s3c2412_roundrate_clksrc(clk, rate);
328
329 clkdivn &= ~S3C2412_CLKDIVN_UARTDIV_MASK;
330 clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_UARTDIV_SHIFT;
331
332 __raw_writel(clkdivn, S3C2410_CLKDIVN);
333 return 0;
334 }
335
336 static struct clk clk_uart = {
337 .name = "uartclk",
338 .ops = &(struct clk_ops) {
339 .get_rate = s3c2412_getrate_uart,
340 .set_rate = s3c2412_setrate_uart,
341 .set_parent = s3c2412_setparent_uart,
342 .round_rate = s3c2412_roundrate_clksrc,
343 },
344 };
345
346 static int s3c2412_setparent_i2s(struct clk *clk, struct clk *parent)
347 {
348 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
349
350 if (parent == &clk_erefclk)
351 clksrc &= ~S3C2412_CLKSRC_I2SCLK_MPLL;
352 else if (parent == &clk_mpll)
353 clksrc |= S3C2412_CLKSRC_I2SCLK_MPLL;
354 else
355 return -EINVAL;
356
357 clk->parent = parent;
358
359 __raw_writel(clksrc, S3C2412_CLKSRC);
360 return 0;
361 }
362
363 static unsigned long s3c2412_getrate_i2s(struct clk *clk)
364 {
365 unsigned long parent_rate = clk_get_rate(clk->parent);
366 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
367
368 div &= S3C2412_CLKDIVN_I2SDIV_MASK;
369 div >>= S3C2412_CLKDIVN_I2SDIV_SHIFT;
370
371 return parent_rate / (div + 1);
372 }
373
374 static int s3c2412_setrate_i2s(struct clk *clk, unsigned long rate)
375 {
376 unsigned long parent_rate = clk_get_rate(clk->parent);
377 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
378
379 rate = s3c2412_roundrate_clksrc(clk, rate);
380
381 clkdivn &= ~S3C2412_CLKDIVN_I2SDIV_MASK;
382 clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_I2SDIV_SHIFT;
383
384 __raw_writel(clkdivn, S3C2410_CLKDIVN);
385 return 0;
386 }
387
388 static struct clk clk_i2s = {
389 .name = "i2sclk",
390 .ops = &(struct clk_ops) {
391 .get_rate = s3c2412_getrate_i2s,
392 .set_rate = s3c2412_setrate_i2s,
393 .set_parent = s3c2412_setparent_i2s,
394 .round_rate = s3c2412_roundrate_clksrc,
395 },
396 };
397
398 static int s3c2412_setparent_cam(struct clk *clk, struct clk *parent)
399 {
400 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
401
402 if (parent == &clk_usysclk)
403 clksrc &= ~S3C2412_CLKSRC_CAMCLK_HCLK;
404 else if (parent == &clk_h)
405 clksrc |= S3C2412_CLKSRC_CAMCLK_HCLK;
406 else
407 return -EINVAL;
408
409 clk->parent = parent;
410
411 __raw_writel(clksrc, S3C2412_CLKSRC);
412 return 0;
413 }
414 static unsigned long s3c2412_getrate_cam(struct clk *clk)
415 {
416 unsigned long parent_rate = clk_get_rate(clk->parent);
417 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
418
419 div &= S3C2412_CLKDIVN_CAMDIV_MASK;
420 div >>= S3C2412_CLKDIVN_CAMDIV_SHIFT;
421
422 return parent_rate / (div + 1);
423 }
424
425 static int s3c2412_setrate_cam(struct clk *clk, unsigned long rate)
426 {
427 unsigned long parent_rate = clk_get_rate(clk->parent);
428 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
429
430 rate = s3c2412_roundrate_clksrc(clk, rate);
431
432 clkdivn &= ~S3C2412_CLKDIVN_CAMDIV_MASK;
433 clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_CAMDIV_SHIFT;
434
435 __raw_writel(clkdivn, S3C2410_CLKDIVN);
436 return 0;
437 }
438
439 static struct clk clk_cam = {
440 .name = "camif-upll", /* same as 2440 name */
441 .ops = &(struct clk_ops) {
442 .get_rate = s3c2412_getrate_cam,
443 .set_rate = s3c2412_setrate_cam,
444 .set_parent = s3c2412_setparent_cam,
445 .round_rate = s3c2412_roundrate_clksrc,
446 },
447 };
448
449 /* standard clock definitions */
450
451 static struct clk init_clocks_disable[] = {
452 {
453 .name = "nand",
454 .parent = &clk_h,
455 .enable = s3c2412_clkcon_enable,
456 .ctrlbit = S3C2412_CLKCON_NAND,
457 }, {
458 .name = "sdi",
459 .parent = &clk_p,
460 .enable = s3c2412_clkcon_enable,
461 .ctrlbit = S3C2412_CLKCON_SDI,
462 }, {
463 .name = "adc",
464 .parent = &clk_p,
465 .enable = s3c2412_clkcon_enable,
466 .ctrlbit = S3C2412_CLKCON_ADC,
467 }, {
468 .name = "i2c",
469 .parent = &clk_p,
470 .enable = s3c2412_clkcon_enable,
471 .ctrlbit = S3C2412_CLKCON_IIC,
472 }, {
473 .name = "iis",
474 .parent = &clk_p,
475 .enable = s3c2412_clkcon_enable,
476 .ctrlbit = S3C2412_CLKCON_IIS,
477 }, {
478 .name = "spi",
479 .parent = &clk_p,
480 .enable = s3c2412_clkcon_enable,
481 .ctrlbit = S3C2412_CLKCON_SPI,
482 }
483 };
484
485 static struct clk init_clocks[] = {
486 {
487 .name = "dma.0",
488 .parent = &clk_h,
489 .enable = s3c2412_clkcon_enable,
490 .ctrlbit = S3C2412_CLKCON_DMA0,
491 }, {
492 .name = "dma.1",
493 .parent = &clk_h,
494 .enable = s3c2412_clkcon_enable,
495 .ctrlbit = S3C2412_CLKCON_DMA1,
496 }, {
497 .name = "dma.2",
498 .parent = &clk_h,
499 .enable = s3c2412_clkcon_enable,
500 .ctrlbit = S3C2412_CLKCON_DMA2,
501 }, {
502 .name = "dma.3",
503 .parent = &clk_h,
504 .enable = s3c2412_clkcon_enable,
505 .ctrlbit = S3C2412_CLKCON_DMA3,
506 }, {
507 .name = "lcd",
508 .parent = &clk_h,
509 .enable = s3c2412_clkcon_enable,
510 .ctrlbit = S3C2412_CLKCON_LCDC,
511 }, {
512 .name = "gpio",
513 .parent = &clk_p,
514 .enable = s3c2412_clkcon_enable,
515 .ctrlbit = S3C2412_CLKCON_GPIO,
516 }, {
517 .name = "usb-host",
518 .parent = &clk_h,
519 .enable = s3c2412_clkcon_enable,
520 .ctrlbit = S3C2412_CLKCON_USBH,
521 }, {
522 .name = "usb-device",
523 .parent = &clk_h,
524 .enable = s3c2412_clkcon_enable,
525 .ctrlbit = S3C2412_CLKCON_USBD,
526 }, {
527 .name = "timers",
528 .parent = &clk_p,
529 .enable = s3c2412_clkcon_enable,
530 .ctrlbit = S3C2412_CLKCON_PWMT,
531 }, {
532 .name = "uart",
533 .devname = "s3c2412-uart.0",
534 .parent = &clk_p,
535 .enable = s3c2412_clkcon_enable,
536 .ctrlbit = S3C2412_CLKCON_UART0,
537 }, {
538 .name = "uart",
539 .devname = "s3c2412-uart.1",
540 .parent = &clk_p,
541 .enable = s3c2412_clkcon_enable,
542 .ctrlbit = S3C2412_CLKCON_UART1,
543 }, {
544 .name = "uart",
545 .devname = "s3c2412-uart.2",
546 .parent = &clk_p,
547 .enable = s3c2412_clkcon_enable,
548 .ctrlbit = S3C2412_CLKCON_UART2,
549 }, {
550 .name = "rtc",
551 .parent = &clk_p,
552 .enable = s3c2412_clkcon_enable,
553 .ctrlbit = S3C2412_CLKCON_RTC,
554 }, {
555 .name = "watchdog",
556 .parent = &clk_p,
557 .ctrlbit = 0,
558 }, {
559 .name = "usb-bus-gadget",
560 .parent = &clk_usb_bus,
561 .enable = s3c2412_clkcon_enable,
562 .ctrlbit = S3C2412_CLKCON_USB_DEV48,
563 }, {
564 .name = "usb-bus-host",
565 .parent = &clk_usb_bus,
566 .enable = s3c2412_clkcon_enable,
567 .ctrlbit = S3C2412_CLKCON_USB_HOST48,
568 }
569 };
570
571 /* clocks to add where we need to check their parentage */
572
573 struct clk_init {
574 struct clk *clk;
575 unsigned int bit;
576 struct clk *src_0;
577 struct clk *src_1;
578 };
579
580 static struct clk_init clks_src[] __initdata = {
581 {
582 .clk = &clk_usysclk,
583 .bit = S3C2412_CLKSRC_USBCLK_HCLK,
584 .src_0 = &clk_urefclk,
585 .src_1 = &clk_upll,
586 }, {
587 .clk = &clk_i2s,
588 .bit = S3C2412_CLKSRC_I2SCLK_MPLL,
589 .src_0 = &clk_erefclk,
590 .src_1 = &clk_mpll,
591 }, {
592 .clk = &clk_cam,
593 .bit = S3C2412_CLKSRC_CAMCLK_HCLK,
594 .src_0 = &clk_usysclk,
595 .src_1 = &clk_h,
596 }, {
597 .clk = &clk_msysclk,
598 .bit = S3C2412_CLKSRC_MSYSCLK_MPLL,
599 .src_0 = &clk_mdivclk,
600 .src_1 = &clk_mpll,
601 }, {
602 .clk = &clk_uart,
603 .bit = S3C2412_CLKSRC_UARTCLK_MPLL,
604 .src_0 = &clk_erefclk,
605 .src_1 = &clk_mpll,
606 }, {
607 .clk = &clk_usbsrc,
608 .bit = S3C2412_CLKSRC_USBCLK_HCLK,
609 .src_0 = &clk_usysclk,
610 .src_1 = &clk_h,
611 /* here we assume OM[4] select xtal */
612 }, {
613 .clk = &clk_erefclk,
614 .bit = S3C2412_CLKSRC_EREFCLK_EXTCLK,
615 .src_0 = &clk_xtal,
616 .src_1 = &clk_ext,
617 }, {
618 .clk = &clk_urefclk,
619 .bit = S3C2412_CLKSRC_UREFCLK_EXTCLK,
620 .src_0 = &clk_xtal,
621 .src_1 = &clk_ext,
622 },
623 };
624
625 /* s3c2412_clk_initparents
626 *
627 * Initialise the parents for the clocks that we get at start-time
628 */
629
630 static void __init s3c2412_clk_initparents(void)
631 {
632 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
633 struct clk_init *cip = clks_src;
634 struct clk *src;
635 int ptr;
636 int ret;
637
638 for (ptr = 0; ptr < ARRAY_SIZE(clks_src); ptr++, cip++) {
639 ret = s3c24xx_register_clock(cip->clk);
640 if (ret < 0) {
641 printk(KERN_ERR "Failed to register clock %s (%d)\n",
642 cip->clk->name, ret);
643 }
644
645 src = (clksrc & cip->bit) ? cip->src_1 : cip->src_0;
646
647 printk(KERN_INFO "%s: parent %s\n", cip->clk->name, src->name);
648 clk_set_parent(cip->clk, src);
649 }
650 }
651
652 /* clocks to add straight away */
653
654 static struct clk *clks[] __initdata = {
655 &clk_ext,
656 &clk_usb_bus,
657 &clk_mrefclk,
658 &clk_armclk,
659 };
660
661 static struct clk_lookup s3c2412_clk_lookup[] = {
662 CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
663 CLKDEV_INIT(NULL, "clk_uart_baud2", &clk_p),
664 CLKDEV_INIT(NULL, "clk_uart_baud3", &clk_usysclk),
665 };
666
667 int __init s3c2412_baseclk_add(void)
668 {
669 unsigned long clkcon = __raw_readl(S3C2410_CLKCON);
670 unsigned int dvs;
671 struct clk *clkp;
672 int ret;
673 int ptr;
674
675 clk_upll.enable = s3c2412_upll_enable;
676 clk_usb_bus.parent = &clk_usbsrc;
677 clk_usb_bus.rate = 0x0;
678
679 clk_f.parent = &clk_msysclk;
680
681 s3c2412_clk_initparents();
682
683 for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
684 clkp = clks[ptr];
685
686 ret = s3c24xx_register_clock(clkp);
687 if (ret < 0) {
688 printk(KERN_ERR "Failed to register clock %s (%d)\n",
689 clkp->name, ret);
690 }
691 }
692
693 /* set the dvs state according to what we got at boot time */
694
695 dvs = __raw_readl(S3C2410_CLKDIVN) & S3C2412_CLKDIVN_DVSEN;
696
697 if (dvs)
698 clk_armclk.parent = &clk_h;
699
700 printk(KERN_INFO "S3C2412: DVS is %s\n", dvs ? "on" : "off");
701
702 /* ensure usb bus clock is within correct rate of 48MHz */
703
704 if (clk_get_rate(&clk_usb_bus) != (48 * 1000 * 1000)) {
705 printk(KERN_INFO "Warning: USB bus clock not at 48MHz\n");
706
707 /* for the moment, let's use the UPLL, and see if we can
708 * get 48MHz */
709
710 clk_set_parent(&clk_usysclk, &clk_upll);
711 clk_set_parent(&clk_usbsrc, &clk_usysclk);
712 clk_set_rate(&clk_usbsrc, 48*1000*1000);
713 }
714
715 printk("S3C2412: upll %s, %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n",
716 (__raw_readl(S3C2410_UPLLCON) & S3C2412_PLLCON_OFF) ? "off":"on",
717 print_mhz(clk_get_rate(&clk_upll)),
718 print_mhz(clk_get_rate(&clk_usb_bus)));
719
720 /* register clocks from clock array */
721
722 clkp = init_clocks;
723 for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
724 /* ensure that we note the clock state */
725
726 clkp->usage = clkcon & clkp->ctrlbit ? 1 : 0;
727
728 ret = s3c24xx_register_clock(clkp);
729 if (ret < 0) {
730 printk(KERN_ERR "Failed to register clock %s (%d)\n",
731 clkp->name, ret);
732 }
733 }
734
735 /* We must be careful disabling the clocks we are not intending to
736 * be using at boot time, as subsystems such as the LCD which do
737 * their own DMA requests to the bus can cause the system to lockup
738 * if they where in the middle of requesting bus access.
739 *
740 * Disabling the LCD clock if the LCD is active is very dangerous,
741 * and therefore the bootloader should be careful to not enable
742 * the LCD clock if it is not needed.
743 */
744
745 /* install (and disable) the clocks we do not need immediately */
746
747 clkp = init_clocks_disable;
748 for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
749
750 ret = s3c24xx_register_clock(clkp);
751 if (ret < 0) {
752 printk(KERN_ERR "Failed to register clock %s (%d)\n",
753 clkp->name, ret);
754 }
755
756 s3c2412_clkcon_enable(clkp, 0);
757 }
758
759 clkdev_add_table(s3c2412_clk_lookup, ARRAY_SIZE(s3c2412_clk_lookup));
760 return 0;
761 }
Linux with added FPC-III support