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First Support on Ginger and OMAP TI
[linux-ginger.git] / arch / arm / mach-s3c2412 / clock.c
bloba037df5e1c2da52103b3b635bc18653f7b541999
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/sysdev.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 .id = -1,
99 };
100
101 static struct clk clk_urefclk = {
102 .name = "urefclk",
103 .id = -1,
104 };
105
106 static int s3c2412_setparent_usysclk(struct clk *clk, struct clk *parent)
107 {
108 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
109
110 if (parent == &clk_urefclk)
111 clksrc &= ~S3C2412_CLKSRC_USYSCLK_UPLL;
112 else if (parent == &clk_upll)
113 clksrc |= S3C2412_CLKSRC_USYSCLK_UPLL;
114 else
115 return -EINVAL;
116
117 clk->parent = parent;
118
119 __raw_writel(clksrc, S3C2412_CLKSRC);
120 return 0;
121 }
122
123 static struct clk clk_usysclk = {
124 .name = "usysclk",
125 .id = -1,
126 .parent = &clk_xtal,
127 .set_parent = s3c2412_setparent_usysclk,
128 };
129
130 static struct clk clk_mrefclk = {
131 .name = "mrefclk",
132 .parent = &clk_xtal,
133 .id = -1,
134 };
135
136 static struct clk clk_mdivclk = {
137 .name = "mdivclk",
138 .parent = &clk_xtal,
139 .id = -1,
140 };
141
142 static int s3c2412_setparent_usbsrc(struct clk *clk, struct clk *parent)
143 {
144 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
145
146 if (parent == &clk_usysclk)
147 clksrc &= ~S3C2412_CLKSRC_USBCLK_HCLK;
148 else if (parent == &clk_h)
149 clksrc |= S3C2412_CLKSRC_USBCLK_HCLK;
150 else
151 return -EINVAL;
152
153 clk->parent = parent;
154
155 __raw_writel(clksrc, S3C2412_CLKSRC);
156 return 0;
157 }
158
159 static unsigned long s3c2412_roundrate_usbsrc(struct clk *clk,
160 unsigned long rate)
161 {
162 unsigned long parent_rate = clk_get_rate(clk->parent);
163 int div;
164
165 if (rate > parent_rate)
166 return parent_rate;
167
168 div = parent_rate / rate;
169 if (div > 2)
170 div = 2;
171
172 return parent_rate / div;
173 }
174
175 static unsigned long s3c2412_getrate_usbsrc(struct clk *clk)
176 {
177 unsigned long parent_rate = clk_get_rate(clk->parent);
178 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
179
180 return parent_rate / ((div & S3C2412_CLKDIVN_USB48DIV) ? 2 : 1);
181 }
182
183 static int s3c2412_setrate_usbsrc(struct clk *clk, unsigned long rate)
184 {
185 unsigned long parent_rate = clk_get_rate(clk->parent);
186 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
187
188 rate = s3c2412_roundrate_usbsrc(clk, rate);
189
190 if ((parent_rate / rate) == 2)
191 clkdivn |= S3C2412_CLKDIVN_USB48DIV;
192 else
193 clkdivn &= ~S3C2412_CLKDIVN_USB48DIV;
194
195 __raw_writel(clkdivn, S3C2410_CLKDIVN);
196 return 0;
197 }
198
199 static struct clk clk_usbsrc = {
200 .name = "usbsrc",
201 .id = -1,
202 .get_rate = s3c2412_getrate_usbsrc,
203 .set_rate = s3c2412_setrate_usbsrc,
204 .round_rate = s3c2412_roundrate_usbsrc,
205 .set_parent = s3c2412_setparent_usbsrc,
206 };
207
208 static int s3c2412_setparent_msysclk(struct clk *clk, struct clk *parent)
209 {
210 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
211
212 if (parent == &clk_mdivclk)
213 clksrc &= ~S3C2412_CLKSRC_MSYSCLK_MPLL;
214 else if (parent == &clk_mpll)
215 clksrc |= S3C2412_CLKSRC_MSYSCLK_MPLL;
216 else
217 return -EINVAL;
218
219 clk->parent = parent;
220
221 __raw_writel(clksrc, S3C2412_CLKSRC);
222 return 0;
223 }
224
225 static struct clk clk_msysclk = {
226 .name = "msysclk",
227 .id = -1,
228 .set_parent = s3c2412_setparent_msysclk,
229 };
230
231 static int s3c2412_setparent_armclk(struct clk *clk, struct clk *parent)
232 {
233 unsigned long flags;
234 unsigned long clkdiv;
235 unsigned long dvs;
236
237 /* Note, we current equate fclk andf msysclk for S3C2412 */
238
239 if (parent == &clk_msysclk || parent == &clk_f)
240 dvs = 0;
241 else if (parent == &clk_h)
242 dvs = S3C2412_CLKDIVN_DVSEN;
243 else
244 return -EINVAL;
245
246 clk->parent = parent;
247
248 /* update this under irq lockdown, clkdivn is not protected
249 * by the clock system. */
250
251 local_irq_save(flags);
252
253 clkdiv = __raw_readl(S3C2410_CLKDIVN);
254 clkdiv &= ~S3C2412_CLKDIVN_DVSEN;
255 clkdiv |= dvs;
256 __raw_writel(clkdiv, S3C2410_CLKDIVN);
257
258 local_irq_restore(flags);
259
260 return 0;
261 }
262
263 static struct clk clk_armclk = {
264 .name = "armclk",
265 .id = -1,
266 .parent = &clk_msysclk,
267 .set_parent = s3c2412_setparent_armclk,
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 .id = -1,
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 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 .id = -1,
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 static int s3c2412_setparent_cam(struct clk *clk, struct clk *parent)
398 {
399 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
400
401 if (parent == &clk_usysclk)
402 clksrc &= ~S3C2412_CLKSRC_CAMCLK_HCLK;
403 else if (parent == &clk_h)
404 clksrc |= S3C2412_CLKSRC_CAMCLK_HCLK;
405 else
406 return -EINVAL;
407
408 clk->parent = parent;
409
410 __raw_writel(clksrc, S3C2412_CLKSRC);
411 return 0;
412 }
413 static unsigned long s3c2412_getrate_cam(struct clk *clk)
414 {
415 unsigned long parent_rate = clk_get_rate(clk->parent);
416 unsigned long div = __raw_readl(S3C2410_CLKDIVN);
417
418 div &= S3C2412_CLKDIVN_CAMDIV_MASK;
419 div >>= S3C2412_CLKDIVN_CAMDIV_SHIFT;
420
421 return parent_rate / (div + 1);
422 }
423
424 static int s3c2412_setrate_cam(struct clk *clk, unsigned long rate)
425 {
426 unsigned long parent_rate = clk_get_rate(clk->parent);
427 unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN);
428
429 rate = s3c2412_roundrate_clksrc(clk, rate);
430
431 clkdivn &= ~S3C2412_CLKDIVN_CAMDIV_MASK;
432 clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_CAMDIV_SHIFT;
433
434 __raw_writel(clkdivn, S3C2410_CLKDIVN);
435 return 0;
436 }
437
438 static struct clk clk_cam = {
439 .name = "camif-upll", /* same as 2440 name */
440 .id = -1,
441 .get_rate = s3c2412_getrate_cam,
442 .set_rate = s3c2412_setrate_cam,
443 .set_parent = s3c2412_setparent_cam,
444 .round_rate = s3c2412_roundrate_clksrc,
445 };
446
447 /* standard clock definitions */
448
449 static struct clk init_clocks_disable[] = {
450 {
451 .name = "nand",
452 .id = -1,
453 .parent = &clk_h,
454 .enable = s3c2412_clkcon_enable,
455 .ctrlbit = S3C2412_CLKCON_NAND,
456 }, {
457 .name = "sdi",
458 .id = -1,
459 .parent = &clk_p,
460 .enable = s3c2412_clkcon_enable,
461 .ctrlbit = S3C2412_CLKCON_SDI,
462 }, {
463 .name = "adc",
464 .id = -1,
465 .parent = &clk_p,
466 .enable = s3c2412_clkcon_enable,
467 .ctrlbit = S3C2412_CLKCON_ADC,
468 }, {
469 .name = "i2c",
470 .id = -1,
471 .parent = &clk_p,
472 .enable = s3c2412_clkcon_enable,
473 .ctrlbit = S3C2412_CLKCON_IIC,
474 }, {
475 .name = "iis",
476 .id = -1,
477 .parent = &clk_p,
478 .enable = s3c2412_clkcon_enable,
479 .ctrlbit = S3C2412_CLKCON_IIS,
480 }, {
481 .name = "spi",
482 .id = -1,
483 .parent = &clk_p,
484 .enable = s3c2412_clkcon_enable,
485 .ctrlbit = S3C2412_CLKCON_SPI,
486 }
487 };
488
489 static struct clk init_clocks[] = {
490 {
491 .name = "dma",
492 .id = 0,
493 .parent = &clk_h,
494 .enable = s3c2412_clkcon_enable,
495 .ctrlbit = S3C2412_CLKCON_DMA0,
496 }, {
497 .name = "dma",
498 .id = 1,
499 .parent = &clk_h,
500 .enable = s3c2412_clkcon_enable,
501 .ctrlbit = S3C2412_CLKCON_DMA1,
502 }, {
503 .name = "dma",
504 .id = 2,
505 .parent = &clk_h,
506 .enable = s3c2412_clkcon_enable,
507 .ctrlbit = S3C2412_CLKCON_DMA2,
508 }, {
509 .name = "dma",
510 .id = 3,
511 .parent = &clk_h,
512 .enable = s3c2412_clkcon_enable,
513 .ctrlbit = S3C2412_CLKCON_DMA3,
514 }, {
515 .name = "lcd",
516 .id = -1,
517 .parent = &clk_h,
518 .enable = s3c2412_clkcon_enable,
519 .ctrlbit = S3C2412_CLKCON_LCDC,
520 }, {
521 .name = "gpio",
522 .id = -1,
523 .parent = &clk_p,
524 .enable = s3c2412_clkcon_enable,
525 .ctrlbit = S3C2412_CLKCON_GPIO,
526 }, {
527 .name = "usb-host",
528 .id = -1,
529 .parent = &clk_h,
530 .enable = s3c2412_clkcon_enable,
531 .ctrlbit = S3C2412_CLKCON_USBH,
532 }, {
533 .name = "usb-device",
534 .id = -1,
535 .parent = &clk_h,
536 .enable = s3c2412_clkcon_enable,
537 .ctrlbit = S3C2412_CLKCON_USBD,
538 }, {
539 .name = "timers",
540 .id = -1,
541 .parent = &clk_p,
542 .enable = s3c2412_clkcon_enable,
543 .ctrlbit = S3C2412_CLKCON_PWMT,
544 }, {
545 .name = "uart",
546 .id = 0,
547 .parent = &clk_p,
548 .enable = s3c2412_clkcon_enable,
549 .ctrlbit = S3C2412_CLKCON_UART0,
550 }, {
551 .name = "uart",
552 .id = 1,
553 .parent = &clk_p,
554 .enable = s3c2412_clkcon_enable,
555 .ctrlbit = S3C2412_CLKCON_UART1,
556 }, {
557 .name = "uart",
558 .id = 2,
559 .parent = &clk_p,
560 .enable = s3c2412_clkcon_enable,
561 .ctrlbit = S3C2412_CLKCON_UART2,
562 }, {
563 .name = "rtc",
564 .id = -1,
565 .parent = &clk_p,
566 .enable = s3c2412_clkcon_enable,
567 .ctrlbit = S3C2412_CLKCON_RTC,
568 }, {
569 .name = "watchdog",
570 .id = -1,
571 .parent = &clk_p,
572 .ctrlbit = 0,
573 }, {
574 .name = "usb-bus-gadget",
575 .id = -1,
576 .parent = &clk_usb_bus,
577 .enable = s3c2412_clkcon_enable,
578 .ctrlbit = S3C2412_CLKCON_USB_DEV48,
579 }, {
580 .name = "usb-bus-host",
581 .id = -1,
582 .parent = &clk_usb_bus,
583 .enable = s3c2412_clkcon_enable,
584 .ctrlbit = S3C2412_CLKCON_USB_HOST48,
585 }
586 };
587
588 /* clocks to add where we need to check their parentage */
589
590 struct clk_init {
591 struct clk *clk;
592 unsigned int bit;
593 struct clk *src_0;
594 struct clk *src_1;
595 };
596
597 static struct clk_init clks_src[] __initdata = {
598 {
599 .clk = &clk_usysclk,
600 .bit = S3C2412_CLKSRC_USBCLK_HCLK,
601 .src_0 = &clk_urefclk,
602 .src_1 = &clk_upll,
603 }, {
604 .clk = &clk_i2s,
605 .bit = S3C2412_CLKSRC_I2SCLK_MPLL,
606 .src_0 = &clk_erefclk,
607 .src_1 = &clk_mpll,
608 }, {
609 .clk = &clk_cam,
610 .bit = S3C2412_CLKSRC_CAMCLK_HCLK,
611 .src_0 = &clk_usysclk,
612 .src_1 = &clk_h,
613 }, {
614 .clk = &clk_msysclk,
615 .bit = S3C2412_CLKSRC_MSYSCLK_MPLL,
616 .src_0 = &clk_mdivclk,
617 .src_1 = &clk_mpll,
618 }, {
619 .clk = &clk_uart,
620 .bit = S3C2412_CLKSRC_UARTCLK_MPLL,
621 .src_0 = &clk_erefclk,
622 .src_1 = &clk_mpll,
623 }, {
624 .clk = &clk_usbsrc,
625 .bit = S3C2412_CLKSRC_USBCLK_HCLK,
626 .src_0 = &clk_usysclk,
627 .src_1 = &clk_h,
628 /* here we assume OM[4] select xtal */
629 }, {
630 .clk = &clk_erefclk,
631 .bit = S3C2412_CLKSRC_EREFCLK_EXTCLK,
632 .src_0 = &clk_xtal,
633 .src_1 = &clk_ext,
634 }, {
635 .clk = &clk_urefclk,
636 .bit = S3C2412_CLKSRC_UREFCLK_EXTCLK,
637 .src_0 = &clk_xtal,
638 .src_1 = &clk_ext,
639 },
640 };
641
642 /* s3c2412_clk_initparents
643 *
644 * Initialise the parents for the clocks that we get at start-time
645 */
646
647 static void __init s3c2412_clk_initparents(void)
648 {
649 unsigned long clksrc = __raw_readl(S3C2412_CLKSRC);
650 struct clk_init *cip = clks_src;
651 struct clk *src;
652 int ptr;
653 int ret;
654
655 for (ptr = 0; ptr < ARRAY_SIZE(clks_src); ptr++, cip++) {
656 ret = s3c24xx_register_clock(cip->clk);
657 if (ret < 0) {
658 printk(KERN_ERR "Failed to register clock %s (%d)\n",
659 cip->clk->name, ret);
660 }
661
662 src = (clksrc & cip->bit) ? cip->src_1 : cip->src_0;
663
664 printk(KERN_INFO "%s: parent %s\n", cip->clk->name, src->name);
665 clk_set_parent(cip->clk, src);
666 }
667 }
668
669 /* clocks to add straight away */
670
671 static struct clk *clks[] __initdata = {
672 &clk_ext,
673 &clk_usb_bus,
674 &clk_mrefclk,
675 &clk_armclk,
676 };
677
678 int __init s3c2412_baseclk_add(void)
679 {
680 unsigned long clkcon = __raw_readl(S3C2410_CLKCON);
681 unsigned int dvs;
682 struct clk *clkp;
683 int ret;
684 int ptr;
685
686 clk_upll.enable = s3c2412_upll_enable;
687 clk_usb_bus.parent = &clk_usbsrc;
688 clk_usb_bus.rate = 0x0;
689
690 clk_f.parent = &clk_msysclk;
691
692 s3c2412_clk_initparents();
693
694 for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
695 clkp = clks[ptr];
696
697 ret = s3c24xx_register_clock(clkp);
698 if (ret < 0) {
699 printk(KERN_ERR "Failed to register clock %s (%d)\n",
700 clkp->name, ret);
701 }
702 }
703
704 /* set the dvs state according to what we got at boot time */
705
706 dvs = __raw_readl(S3C2410_CLKDIVN) & S3C2412_CLKDIVN_DVSEN;
707
708 if (dvs)
709 clk_armclk.parent = &clk_h;
710
711 printk(KERN_INFO "S3C2412: DVS is %s\n", dvs ? "on" : "off");
712
713 /* ensure usb bus clock is within correct rate of 48MHz */
714
715 if (clk_get_rate(&clk_usb_bus) != (48 * 1000 * 1000)) {
716 printk(KERN_INFO "Warning: USB bus clock not at 48MHz\n");
717
718 /* for the moment, let's use the UPLL, and see if we can
719 * get 48MHz */
720
721 clk_set_parent(&clk_usysclk, &clk_upll);
722 clk_set_parent(&clk_usbsrc, &clk_usysclk);
723 clk_set_rate(&clk_usbsrc, 48*1000*1000);
724 }
725
726 printk("S3C2412: upll %s, %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n",
727 (__raw_readl(S3C2410_UPLLCON) & S3C2412_PLLCON_OFF) ? "off":"on",
728 print_mhz(clk_get_rate(&clk_upll)),
729 print_mhz(clk_get_rate(&clk_usb_bus)));
730
731 /* register clocks from clock array */
732
733 clkp = init_clocks;
734 for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) {
735 /* ensure that we note the clock state */
736
737 clkp->usage = clkcon & clkp->ctrlbit ? 1 : 0;
738
739 ret = s3c24xx_register_clock(clkp);
740 if (ret < 0) {
741 printk(KERN_ERR "Failed to register clock %s (%d)\n",
742 clkp->name, ret);
743 }
744 }
745
746 /* We must be careful disabling the clocks we are not intending to
747 * be using at boot time, as subsystems such as the LCD which do
748 * their own DMA requests to the bus can cause the system to lockup
749 * if they where in the middle of requesting bus access.
750 *
751 * Disabling the LCD clock if the LCD is active is very dangerous,
752 * and therefore the bootloader should be careful to not enable
753 * the LCD clock if it is not needed.
754 */
755
756 /* install (and disable) the clocks we do not need immediately */
757
758 clkp = init_clocks_disable;
759 for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
760
761 ret = s3c24xx_register_clock(clkp);
762 if (ret < 0) {
763 printk(KERN_ERR "Failed to register clock %s (%d)\n",
764 clkp->name, ret);
765 }
766
767 s3c2412_clkcon_enable(clkp, 0);
768 }
769
770 s3c_pwmclk_init();
771 return 0;
772 }
Linux for Ginger Game Console