?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Linux 3.3.2
[zen-stable.git] / arch / arm / mach-s3c2412 / clock.c
blobd10b695a9066a760fe98d965383847e52be8f9bd
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/s3c2412.h>
45 #include <plat/clock.h>
46 #include <plat/cpu.h>
47
48 /* We currently have to assume that the system is running
49 * from the XTPll input, and that all ***REFCLKs are being
50 * fed from it, as we cannot read the state of OM[4] from
51 * software.
52 *
53 * It would be possible for each board initialisation to
54 * set the correct muxing at initialisation
55 */
56
57 static int s3c2412_clkcon_enable(struct clk *clk, int enable)
58 {
59 unsigned int clocks = clk->ctrlbit;
60 unsigned long clkcon;
61
62 clkcon = __raw_readl(S3C2410_CLKCON);
63
64 if (enable)
65 clkcon |= clocks;
66 else
67 clkcon &= ~clocks;
68
69 __raw_writel(clkcon, S3C2410_CLKCON);
70
71 return 0;
72 }
73
74 static int s3c2412_upll_enable(struct clk *clk, int enable)
75 {
76 unsigned long upllcon = __raw_readl(S3C2410_UPLLCON);
77 unsigned long orig = upllcon;
78
79 if (!enable)
80 upllcon |= S3C2412_PLLCON_OFF;
81 else
82 upllcon &= ~S3C2412_PLLCON_OFF;
83
84 __raw_writel(upllcon, S3C2410_UPLLCON);
85
86 /* allow ~150uS for the PLL to settle and lock */
87
88 if (enable && (orig & S3C2412_PLLCON_OFF))
89 udelay(150);
90
91 return 0;
92 }
93
94 /* clock selections */
95
96 static struct clk clk_erefclk = {
97 .name = "erefclk",
98 };
99
100 static struct clk clk_urefclk = {
101 .name = "urefclk",
102 };
103
104 static int s3c2412_setparent_usysclk(struct clk *clk, struct clk *parent)
105 {
106 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
107
108 if (parent == &clk_urefclk)
109 clksrc &= ~S3C2412_CLKSRC_USYSCLK_UPLL;
110 else if (parent == &clk_upll)
111 clksrc |= S3C2412_CLKSRC_USYSCLK_UPLL;
112 else
113 return -EINVAL;
114
115 clk->parent = parent;
116
117 __raw_writel(clksrc, S3C2412_CLKSRC);
118 return 0;
119 }
120
121 static struct clk clk_usysclk = {
122 .name = "usysclk",
123 .parent = &clk_xtal,
124 .ops = &(struct clk_ops) {
125 .set_parent = s3c2412_setparent_usysclk,
126 },
127 };
128
129 static struct clk clk_mrefclk = {
130 .name = "mrefclk",
131 .parent = &clk_xtal,
132 };
133
134 static struct clk clk_mdivclk = {
135 .name = "mdivclk",
136 .parent = &clk_xtal,
137 };
138
139 static int s3c2412_setparent_usbsrc(struct clk *clk, struct clk *parent)
140 {
141 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
142
143 if (parent == &clk_usysclk)
144 clksrc &= ~S3C2412_CLKSRC_USBCLK_HCLK;
145 else if (parent == &clk_h)
146 clksrc |= S3C2412_CLKSRC_USBCLK_HCLK;
147 else
148 return -EINVAL;
149
150 clk->parent = parent;
151
152 __raw_writel(clksrc, S3C2412_CLKSRC);
153 return 0;
154 }
155
156 static unsigned long s3c2412_roundrate_usbsrc(struct clk *clk,
157 unsigned long rate)
158 {
159 unsigned long parent_rate = clk_get_rate(clk->parent);
160 int div;
161
162 if (rate > parent_rate)
163 return parent_rate;
164
165 div = parent_rate / rate;
166 if (div > 2)
167 div = 2;
168
169 return parent_rate / div;
170 }
171
172 static unsigned long s3c2412_getrate_usbsrc(struct clk *clk)
173 {
174 unsigned long parent_rate = clk_get_rate(clk->parent);
175 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
176
177 return parent_rate / ((div & S3C2412_CLKDIVN_USB48DIV) ? 2 : 1);
178 }
179
180 static int s3c2412_setrate_usbsrc(struct clk *clk, unsigned long rate)
181 {
182 unsigned long parent_rate = clk_get_rate(clk->parent);
183 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
184
185 rate = s3c2412_roundrate_usbsrc(clk, rate);
186
187 if ((parent_rate / rate) == 2)
188 clkdivn |= S3C2412_CLKDIVN_USB48DIV;
189 else
190 clkdivn &= ~S3C2412_CLKDIVN_USB48DIV;
191
192 __raw_writel(clkdivn, S3C2410_CLKDIVN);
193 return 0;
194 }
195
196 static struct clk clk_usbsrc = {
197 .name = "usbsrc",
198 .ops = &(struct clk_ops) {
199 .get_rate = s3c2412_getrate_usbsrc,
200 .set_rate = s3c2412_setrate_usbsrc,
201 .round_rate = s3c2412_roundrate_usbsrc,
202 .set_parent = s3c2412_setparent_usbsrc,
203 },
204 };
205
206 static int s3c2412_setparent_msysclk(struct clk *clk, struct clk *parent)
207 {
208 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
209
210 if (parent == &clk_mdivclk)
211 clksrc &= ~S3C2412_CLKSRC_MSYSCLK_MPLL;
212 else if (parent == &clk_mpll)
213 clksrc |= S3C2412_CLKSRC_MSYSCLK_MPLL;
214 else
215 return -EINVAL;
216
217 clk->parent = parent;
218
219 __raw_writel(clksrc, S3C2412_CLKSRC);
220 return 0;
221 }
222
223 static struct clk clk_msysclk = {
224 .name = "msysclk",
225 .ops = &(struct clk_ops) {
226 .set_parent = s3c2412_setparent_msysclk,
227 },
228 };
229
230 static int s3c2412_setparent_armclk(struct clk *clk, struct clk *parent)
231 {
232 unsigned long flags;
233 unsigned long clkdiv;
234 unsigned long dvs;
235
236 /* Note, we current equate fclk andf msysclk for S3C2412 */
237
238 if (parent == &clk_msysclk || parent == &clk_f)
239 dvs = 0;
240 else if (parent == &clk_h)
241 dvs = S3C2412_CLKDIVN_DVSEN;
242 else
243 return -EINVAL;
244
245 clk->parent = parent;
246
247 /* update this under irq lockdown, clkdivn is not protected
248 * by the clock system. */
249
250 local_irq_save(flags);
251
252 clkdiv = __raw_readl(S3C2410_CLKDIVN);
253 clkdiv &= ~S3C2412_CLKDIVN_DVSEN;
254 clkdiv |= dvs;
255 __raw_writel(clkdiv, S3C2410_CLKDIVN);
256
257 local_irq_restore(flags);
258
259 return 0;
260 }
261
262 static struct clk clk_armclk = {
263 .name = "armclk",
264 .parent = &clk_msysclk,
265 .ops = &(struct clk_ops) {
266 .set_parent = s3c2412_setparent_armclk,
267 },
268 };
269
270 /* these next clocks have an divider immediately after them,
271 * so we can register them with their divider and leave out the
272 * intermediate clock stage
273 */
274 static unsigned long s3c2412_roundrate_clksrc(struct clk *clk,
275 unsigned long rate)
276 {
277 unsigned long parent_rate = clk_get_rate(clk->parent);
278 int div;
279
280 if (rate > parent_rate)
281 return parent_rate;
282
283 /* note, we remove the +/- 1 calculations as they cancel out */
284
285 div = (rate / parent_rate);
286
287 if (div < 1)
288 div = 1;
289 else if (div > 16)
290 div = 16;
291
292 return parent_rate / div;
293 }
294
295 static int s3c2412_setparent_uart(struct clk *clk, struct clk *parent)
296 {
297 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
298
299 if (parent == &clk_erefclk)
300 clksrc &= ~S3C2412_CLKSRC_UARTCLK_MPLL;
301 else if (parent == &clk_mpll)
302 clksrc |= S3C2412_CLKSRC_UARTCLK_MPLL;
303 else
304 return -EINVAL;
305
306 clk->parent = parent;
307
308 __raw_writel(clksrc, S3C2412_CLKSRC);
309 return 0;
310 }
311
312 static unsigned long s3c2412_getrate_uart(struct clk *clk)
313 {
314 unsigned long parent_rate = clk_get_rate(clk->parent);
315 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
316
317 div &= S3C2412_CLKDIVN_UARTDIV_MASK;
318 div >>= S3C2412_CLKDIVN_UARTDIV_SHIFT;
319
320 return parent_rate / (div + 1);
321 }
322
323 static int s3c2412_setrate_uart(struct clk *clk, unsigned long rate)
324 {
325 unsigned long parent_rate = clk_get_rate(clk->parent);
326 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
327
328 rate = s3c2412_roundrate_clksrc(clk, rate);
329
330 clkdivn &= ~S3C2412_CLKDIVN_UARTDIV_MASK;
331 clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_UARTDIV_SHIFT;
332
333 __raw_writel(clkdivn, S3C2410_CLKDIVN);
334 return 0;
335 }
336
337 static struct clk clk_uart = {
338 .name = "uartclk",
339 .ops = &(struct clk_ops) {
340 .get_rate = s3c2412_getrate_uart,
341 .set_rate = s3c2412_setrate_uart,
342 .set_parent = s3c2412_setparent_uart,
343 .round_rate = s3c2412_roundrate_clksrc,
344 },
345 };
346
347 static int s3c2412_setparent_i2s(struct clk *clk, struct clk *parent)
348 {
349 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
350
351 if (parent == &clk_erefclk)
352 clksrc &= ~S3C2412_CLKSRC_I2SCLK_MPLL;
353 else if (parent == &clk_mpll)
354 clksrc |= S3C2412_CLKSRC_I2SCLK_MPLL;
355 else
356 return -EINVAL;
357
358 clk->parent = parent;
359
360 __raw_writel(clksrc, S3C2412_CLKSRC);
361 return 0;
362 }
363
364 static unsigned long s3c2412_getrate_i2s(struct clk *clk)
365 {
366 unsigned long parent_rate = clk_get_rate(clk->parent);
367 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
368
369 div &= S3C2412_CLKDIVN_I2SDIV_MASK;
370 div >>= S3C2412_CLKDIVN_I2SDIV_SHIFT;
371
372 return parent_rate / (div + 1);
373 }
374
375 static int s3c2412_setrate_i2s(struct clk *clk, unsigned long rate)
376 {
377 unsigned long parent_rate = clk_get_rate(clk->parent);
378 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
379
380 rate = s3c2412_roundrate_clksrc(clk, rate);
381
382 clkdivn &= ~S3C2412_CLKDIVN_I2SDIV_MASK;
383 clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_I2SDIV_SHIFT;
384
385 __raw_writel(clkdivn, S3C2410_CLKDIVN);
386 return 0;
387 }
388
389 static struct clk clk_i2s = {
390 .name = "i2sclk",
391 .ops = &(struct clk_ops) {
392 .get_rate = s3c2412_getrate_i2s,
393 .set_rate = s3c2412_setrate_i2s,
394 .set_parent = s3c2412_setparent_i2s,
395 .round_rate = s3c2412_roundrate_clksrc,
396 },
397 };
398
399 static int s3c2412_setparent_cam(struct clk *clk, struct clk *parent)
400 {
401 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
402
403 if (parent == &clk_usysclk)
404 clksrc &= ~S3C2412_CLKSRC_CAMCLK_HCLK;
405 else if (parent == &clk_h)
406 clksrc |= S3C2412_CLKSRC_CAMCLK_HCLK;
407 else
408 return -EINVAL;
409
410 clk->parent = parent;
411
412 __raw_writel(clksrc, S3C2412_CLKSRC);
413 return 0;
414 }
415 static unsigned long s3c2412_getrate_cam(struct clk *clk)
416 {
417 unsigned long parent_rate = clk_get_rate(clk->parent);
418 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
419
420 div &= S3C2412_CLKDIVN_CAMDIV_MASK;
421 div >>= S3C2412_CLKDIVN_CAMDIV_SHIFT;
422
423 return parent_rate / (div + 1);
424 }
425
426 static int s3c2412_setrate_cam(struct clk *clk, unsigned long rate)
427 {
428 unsigned long parent_rate = clk_get_rate(clk->parent);
429 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
430
431 rate = s3c2412_roundrate_clksrc(clk, rate);
432
433 clkdivn &= ~S3C2412_CLKDIVN_CAMDIV_MASK;
434 clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_CAMDIV_SHIFT;
435
436 __raw_writel(clkdivn, S3C2410_CLKDIVN);
437 return 0;
438 }
439
440 static struct clk clk_cam = {
441 .name = "camif-upll", /* same as 2440 name */
442 .ops = &(struct clk_ops) {
443 .get_rate = s3c2412_getrate_cam,
444 .set_rate = s3c2412_setrate_cam,
445 .set_parent = s3c2412_setparent_cam,
446 .round_rate = s3c2412_roundrate_clksrc,
447 },
448 };
449
450 /* standard clock definitions */
451
452 static struct clk init_clocks_disable[] = {
453 {
454 .name = "nand",
455 .parent = &clk_h,
456 .enable = s3c2412_clkcon_enable,
457 .ctrlbit = S3C2412_CLKCON_NAND,
458 }, {
459 .name = "sdi",
460 .parent = &clk_p,
461 .enable = s3c2412_clkcon_enable,
462 .ctrlbit = S3C2412_CLKCON_SDI,
463 }, {
464 .name = "adc",
465 .parent = &clk_p,
466 .enable = s3c2412_clkcon_enable,
467 .ctrlbit = S3C2412_CLKCON_ADC,
468 }, {
469 .name = "i2c",
470 .parent = &clk_p,
471 .enable = s3c2412_clkcon_enable,
472 .ctrlbit = S3C2412_CLKCON_IIC,
473 }, {
474 .name = "iis",
475 .parent = &clk_p,
476 .enable = s3c2412_clkcon_enable,
477 .ctrlbit = S3C2412_CLKCON_IIS,
478 }, {
479 .name = "spi",
480 .parent = &clk_p,
481 .enable = s3c2412_clkcon_enable,
482 .ctrlbit = S3C2412_CLKCON_SPI,
483 }
484 };
485
486 static struct clk init_clocks[] = {
487 {
488 .name = "dma",
489 .parent = &clk_h,
490 .enable = s3c2412_clkcon_enable,
491 .ctrlbit = S3C2412_CLKCON_DMA0,
492 }, {
493 .name = "dma",
494 .parent = &clk_h,
495 .enable = s3c2412_clkcon_enable,
496 .ctrlbit = S3C2412_CLKCON_DMA1,
497 }, {
498 .name = "dma",
499 .parent = &clk_h,
500 .enable = s3c2412_clkcon_enable,
501 .ctrlbit = S3C2412_CLKCON_DMA2,
502 }, {
503 .name = "dma",
504 .parent = &clk_h,
505 .enable = s3c2412_clkcon_enable,
506 .ctrlbit = S3C2412_CLKCON_DMA3,
507 }, {
508 .name = "lcd",
509 .parent = &clk_h,
510 .enable = s3c2412_clkcon_enable,
511 .ctrlbit = S3C2412_CLKCON_LCDC,
512 }, {
513 .name = "gpio",
514 .parent = &clk_p,
515 .enable = s3c2412_clkcon_enable,
516 .ctrlbit = S3C2412_CLKCON_GPIO,
517 }, {
518 .name = "usb-host",
519 .parent = &clk_h,
520 .enable = s3c2412_clkcon_enable,
521 .ctrlbit = S3C2412_CLKCON_USBH,
522 }, {
523 .name = "usb-device",
524 .parent = &clk_h,
525 .enable = s3c2412_clkcon_enable,
526 .ctrlbit = S3C2412_CLKCON_USBD,
527 }, {
528 .name = "timers",
529 .parent = &clk_p,
530 .enable = s3c2412_clkcon_enable,
531 .ctrlbit = S3C2412_CLKCON_PWMT,
532 }, {
533 .name = "uart",
534 .devname = "s3c2412-uart.0",
535 .parent = &clk_p,
536 .enable = s3c2412_clkcon_enable,
537 .ctrlbit = S3C2412_CLKCON_UART0,
538 }, {
539 .name = "uart",
540 .devname = "s3c2412-uart.1",
541 .parent = &clk_p,
542 .enable = s3c2412_clkcon_enable,
543 .ctrlbit = S3C2412_CLKCON_UART1,
544 }, {
545 .name = "uart",
546 .devname = "s3c2412-uart.2",
547 .parent = &clk_p,
548 .enable = s3c2412_clkcon_enable,
549 .ctrlbit = S3C2412_CLKCON_UART2,
550 }, {
551 .name = "rtc",
552 .parent = &clk_p,
553 .enable = s3c2412_clkcon_enable,
554 .ctrlbit = S3C2412_CLKCON_RTC,
555 }, {
556 .name = "watchdog",
557 .parent = &clk_p,
558 .ctrlbit = 0,
559 }, {
560 .name = "usb-bus-gadget",
561 .parent = &clk_usb_bus,
562 .enable = s3c2412_clkcon_enable,
563 .ctrlbit = S3C2412_CLKCON_USB_DEV48,
564 }, {
565 .name = "usb-bus-host",
566 .parent = &clk_usb_bus,
567 .enable = s3c2412_clkcon_enable,
568 .ctrlbit = S3C2412_CLKCON_USB_HOST48,
569 }
570 };
571
572 /* clocks to add where we need to check their parentage */
573
574 struct clk_init {
575 struct clk *clk;
576 unsigned int bit;
577 struct clk *src_0;
578 struct clk *src_1;
579 };
580
581 static struct clk_init clks_src[] __initdata = {
582 {
583 .clk = &clk_usysclk,
584 .bit = S3C2412_CLKSRC_USBCLK_HCLK,
585 .src_0 = &clk_urefclk,
586 .src_1 = &clk_upll,
587 }, {
588 .clk = &clk_i2s,
589 .bit = S3C2412_CLKSRC_I2SCLK_MPLL,
590 .src_0 = &clk_erefclk,
591 .src_1 = &clk_mpll,
592 }, {
593 .clk = &clk_cam,
594 .bit = S3C2412_CLKSRC_CAMCLK_HCLK,
595 .src_0 = &clk_usysclk,
596 .src_1 = &clk_h,
597 }, {
598 .clk = &clk_msysclk,
599 .bit = S3C2412_CLKSRC_MSYSCLK_MPLL,
600 .src_0 = &clk_mdivclk,
601 .src_1 = &clk_mpll,
602 }, {
603 .clk = &clk_uart,
604 .bit = S3C2412_CLKSRC_UARTCLK_MPLL,
605 .src_0 = &clk_erefclk,
606 .src_1 = &clk_mpll,
607 }, {
608 .clk = &clk_usbsrc,
609 .bit = S3C2412_CLKSRC_USBCLK_HCLK,
610 .src_0 = &clk_usysclk,
611 .src_1 = &clk_h,
612 /* here we assume OM[4] select xtal */
613 }, {
614 .clk = &clk_erefclk,
615 .bit = S3C2412_CLKSRC_EREFCLK_EXTCLK,
616 .src_0 = &clk_xtal,
617 .src_1 = &clk_ext,
618 }, {
619 .clk = &clk_urefclk,
620 .bit = S3C2412_CLKSRC_UREFCLK_EXTCLK,
621 .src_0 = &clk_xtal,
622 .src_1 = &clk_ext,
623 },
624 };
625
626 /* s3c2412_clk_initparents
627 *
628 * Initialise the parents for the clocks that we get at start-time
629 */
630
631 static void __init s3c2412_clk_initparents(void)
632 {
633 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
634 struct clk_init *cip = clks_src;
635 struct clk *src;
636 int ptr;
637 int ret;
638
639 for (ptr = 0; ptr < ARRAY_SIZE(clks_src); ptr++, cip++) {
640 ret = s3c24xx_register_clock(cip->clk);
641 if (ret < 0) {
642 printk(KERN_ERR "Failed to register clock %s (%d)\n",
643 cip->clk->name, ret);
644 }
645
646 src = (clksrc & cip->bit) ? cip->src_1 : cip->src_0;
647
648 printk(KERN_INFO "%s: parent %s\n", cip->clk->name, src->name);
649 clk_set_parent(cip->clk, src);
650 }
651 }
652
653 /* clocks to add straight away */
654
655 static struct clk *clks[] __initdata = {
656 &clk_ext,
657 &clk_usb_bus,
658 &clk_mrefclk,
659 &clk_armclk,
660 };
661
662 static struct clk_lookup s3c2412_clk_lookup[] = {
663 CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
664 CLKDEV_INIT(NULL, "clk_uart_baud2", &clk_p),
665 CLKDEV_INIT(NULL, "clk_uart_baud3", &clk_usysclk),
666 };
667
668 int __init s3c2412_baseclk_add(void)
669 {
670 unsigned long clkcon = __raw_readl(S3C2410_CLKCON);
671 unsigned int dvs;
672 struct clk *clkp;
673 int ret;
674 int ptr;
675
676 clk_upll.enable = s3c2412_upll_enable;
677 clk_usb_bus.parent = &clk_usbsrc;
678 clk_usb_bus.rate = 0x0;
679
680 clk_f.parent = &clk_msysclk;
681
682 s3c2412_clk_initparents();
683
684 for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
685 clkp = clks[ptr];
686
687 ret = s3c24xx_register_clock(clkp);
688 if (ret < 0) {
689 printk(KERN_ERR "Failed to register clock %s (%d)\n",
690 clkp->name, ret);
691 }
692 }
693
694 /* set the dvs state according to what we got at boot time */
695
696 dvs = __raw_readl(S3C2410_CLKDIVN) & S3C2412_CLKDIVN_DVSEN;
697
698 if (dvs)
699 clk_armclk.parent = &clk_h;
700
701 printk(KERN_INFO "S3C2412: DVS is %s\n", dvs ? "on" : "off");
702
703 /* ensure usb bus clock is within correct rate of 48MHz */
704
705 if (clk_get_rate(&clk_usb_bus) != (48 * 1000 * 1000)) {
706 printk(KERN_INFO "Warning: USB bus clock not at 48MHz\n");
707
708 /* for the moment, let's use the UPLL, and see if we can
709 * get 48MHz */
710
711 clk_set_parent(&clk_usysclk, &clk_upll);
712 clk_set_parent(&clk_usbsrc, &clk_usysclk);
713 clk_set_rate(&clk_usbsrc, 48*1000*1000);
714 }
715
716 printk("S3C2412: upll %s, %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n",
717 (__raw_readl(S3C2410_UPLLCON) & S3C2412_PLLCON_OFF) ? "off":"on",
718 print_mhz(clk_get_rate(&clk_upll)),
719 print_mhz(clk_get_rate(&clk_usb_bus)));
720
721 /* register clocks from clock array */
722
723 clkp = init_clocks;
724 for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
725 /* ensure that we note the clock state */
726
727 clkp->usage = clkcon & clkp->ctrlbit ? 1 : 0;
728
729 ret = s3c24xx_register_clock(clkp);
730 if (ret < 0) {
731 printk(KERN_ERR "Failed to register clock %s (%d)\n",
732 clkp->name, ret);
733 }
734 }
735
736 /* We must be careful disabling the clocks we are not intending to
737 * be using at boot time, as subsystems such as the LCD which do
738 * their own DMA requests to the bus can cause the system to lockup
739 * if they where in the middle of requesting bus access.
740 *
741 * Disabling the LCD clock if the LCD is active is very dangerous,
742 * and therefore the bootloader should be careful to not enable
743 * the LCD clock if it is not needed.
744 */
745
746 /* install (and disable) the clocks we do not need immediately */
747
748 clkp = init_clocks_disable;
749 for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
750
751 ret = s3c24xx_register_clock(clkp);
752 if (ret < 0) {
753 printk(KERN_ERR "Failed to register clock %s (%d)\n",
754 clkp->name, ret);
755 }
756
757 s3c2412_clkcon_enable(clkp, 0);
758 }
759
760 clkdev_add_table(s3c2412_clk_lookup, ARRAY_SIZE(s3c2412_clk_lookup));
761 s3c_pwmclk_init();
762 return 0;
763 }