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OMAP: Add new function to check wether there is irq pending
[linux-ginger.git] / arch / arm / mach-mx2 / clock_imx21.c
blob999d013e06e352e62e45cc232fc28b755b573ebd
1 /*
2 * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
4 * Copyright 2008 Martin Fuzzey, mfuzzey@gmail.com
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
18 * MA 02110-1301, USA.
19 */
20
21 #include <linux/clk.h>
22 #include <linux/io.h>
23 #include <linux/module.h>
24
25 #include <mach/clock.h>
26 #include <mach/common.h>
27 #include <asm/clkdev.h>
28 #include <asm/div64.h>
29
30 #include "crm_regs.h"
31
32 static int _clk_enable(struct clk *clk)
33 {
34 u32 reg;
35
36 reg = __raw_readl(clk->enable_reg);
37 reg |= 1 << clk->enable_shift;
38 __raw_writel(reg, clk->enable_reg);
39 return 0;
40 }
41
42 static void _clk_disable(struct clk *clk)
43 {
44 u32 reg;
45
46 reg = __raw_readl(clk->enable_reg);
47 reg &= ~(1 << clk->enable_shift);
48 __raw_writel(reg, clk->enable_reg);
49 }
50
51 static int _clk_spll_enable(struct clk *clk)
52 {
53 u32 reg;
54
55 reg = __raw_readl(CCM_CSCR);
56 reg |= CCM_CSCR_SPEN;
57 __raw_writel(reg, CCM_CSCR);
58
59 while ((__raw_readl(CCM_SPCTL1) & CCM_SPCTL1_LF) == 0)
60 ;
61 return 0;
62 }
63
64 static void _clk_spll_disable(struct clk *clk)
65 {
66 u32 reg;
67
68 reg = __raw_readl(CCM_CSCR);
69 reg &= ~CCM_CSCR_SPEN;
70 __raw_writel(reg, CCM_CSCR);
71 }
72
73
74 #define CSCR() (__raw_readl(CCM_CSCR))
75 #define PCDR0() (__raw_readl(CCM_PCDR0))
76 #define PCDR1() (__raw_readl(CCM_PCDR1))
77
78 static unsigned long _clk_perclkx_round_rate(struct clk *clk,
79 unsigned long rate)
80 {
81 u32 div;
82 unsigned long parent_rate;
83
84 parent_rate = clk_get_rate(clk->parent);
85
86 div = parent_rate / rate;
87 if (parent_rate % rate)
88 div++;
89
90 if (div > 64)
91 div = 64;
92
93 return parent_rate / div;
94 }
95
96 static int _clk_perclkx_set_rate(struct clk *clk, unsigned long rate)
97 {
98 u32 reg;
99 u32 div;
100 unsigned long parent_rate;
101
102 parent_rate = clk_get_rate(clk->parent);
103
104 if (clk->id < 0 || clk->id > 3)
105 return -EINVAL;
106
107 div = parent_rate / rate;
108 if (div > 64 || div < 1 || ((parent_rate / div) != rate))
109 return -EINVAL;
110 div--;
111
112 reg =
113 __raw_readl(CCM_PCDR1) & ~(CCM_PCDR1_PERDIV1_MASK <<
114 (clk->id << 3));
115 reg |= div << (clk->id << 3);
116 __raw_writel(reg, CCM_PCDR1);
117
118 return 0;
119 }
120
121 static unsigned long _clk_usb_recalc(struct clk *clk)
122 {
123 unsigned long usb_pdf;
124 unsigned long parent_rate;
125
126 parent_rate = clk_get_rate(clk->parent);
127
128 usb_pdf = (CSCR() & CCM_CSCR_USB_MASK) >> CCM_CSCR_USB_OFFSET;
129
130 return parent_rate / (usb_pdf + 1U);
131 }
132
133 static unsigned long _clk_ssix_recalc(struct clk *clk, unsigned long pdf)
134 {
135 unsigned long parent_rate;
136
137 parent_rate = clk_get_rate(clk->parent);
138
139 pdf = (pdf < 2) ? 124UL : pdf; /* MX21 & MX27 TO1 */
140
141 return 2UL * parent_rate / pdf;
142 }
143
144 static unsigned long _clk_ssi1_recalc(struct clk *clk)
145 {
146 return _clk_ssix_recalc(clk,
147 (PCDR0() & CCM_PCDR0_SSI1BAUDDIV_MASK)
148 >> CCM_PCDR0_SSI1BAUDDIV_OFFSET);
149 }
150
151 static unsigned long _clk_ssi2_recalc(struct clk *clk)
152 {
153 return _clk_ssix_recalc(clk,
154 (PCDR0() & CCM_PCDR0_SSI2BAUDDIV_MASK) >>
155 CCM_PCDR0_SSI2BAUDDIV_OFFSET);
156 }
157
158 static unsigned long _clk_nfc_recalc(struct clk *clk)
159 {
160 unsigned long nfc_pdf;
161 unsigned long parent_rate;
162
163 parent_rate = clk_get_rate(clk->parent);
164
165 nfc_pdf = (PCDR0() & CCM_PCDR0_NFCDIV_MASK)
166 >> CCM_PCDR0_NFCDIV_OFFSET;
167
168 return parent_rate / (nfc_pdf + 1);
169 }
170
171 static unsigned long _clk_parent_round_rate(struct clk *clk, unsigned long rate)
172 {
173 return clk->parent->round_rate(clk->parent, rate);
174 }
175
176 static int _clk_parent_set_rate(struct clk *clk, unsigned long rate)
177 {
178 return clk->parent->set_rate(clk->parent, rate);
179 }
180
181 static unsigned long external_high_reference; /* in Hz */
182
183 static unsigned long get_high_reference_clock_rate(struct clk *clk)
184 {
185 return external_high_reference;
186 }
187
188 /*
189 * the high frequency external clock reference
190 * Default case is 26MHz.
191 */
192 static struct clk ckih_clk = {
193 .get_rate = get_high_reference_clock_rate,
194 };
195
196 static unsigned long external_low_reference; /* in Hz */
197
198 static unsigned long get_low_reference_clock_rate(struct clk *clk)
199 {
200 return external_low_reference;
201 }
202
203 /*
204 * the low frequency external clock reference
205 * Default case is 32.768kHz.
206 */
207 static struct clk ckil_clk = {
208 .get_rate = get_low_reference_clock_rate,
209 };
210
211
212 static unsigned long _clk_fpm_recalc(struct clk *clk)
213 {
214 return clk_get_rate(clk->parent) * 512;
215 }
216
217 /* Output of frequency pre multiplier */
218 static struct clk fpm_clk = {
219 .parent = &ckil_clk,
220 .get_rate = _clk_fpm_recalc,
221 };
222
223 static unsigned long get_mpll_clk(struct clk *clk)
224 {
225 uint32_t reg;
226 unsigned long ref_clk;
227 unsigned long mfi = 0, mfn = 0, mfd = 0, pdf = 0;
228 unsigned long long temp;
229
230 ref_clk = clk_get_rate(clk->parent);
231
232 reg = __raw_readl(CCM_MPCTL0);
233 pdf = (reg & CCM_MPCTL0_PD_MASK) >> CCM_MPCTL0_PD_OFFSET;
234 mfd = (reg & CCM_MPCTL0_MFD_MASK) >> CCM_MPCTL0_MFD_OFFSET;
235 mfi = (reg & CCM_MPCTL0_MFI_MASK) >> CCM_MPCTL0_MFI_OFFSET;
236 mfn = (reg & CCM_MPCTL0_MFN_MASK) >> CCM_MPCTL0_MFN_OFFSET;
237
238 mfi = (mfi <= 5) ? 5 : mfi;
239 temp = 2LL * ref_clk * mfn;
240 do_div(temp, mfd + 1);
241 temp = 2LL * ref_clk * mfi + temp;
242 do_div(temp, pdf + 1);
243
244 return (unsigned long)temp;
245 }
246
247 static struct clk mpll_clk = {
248 .parent = &ckih_clk,
249 .get_rate = get_mpll_clk,
250 };
251
252 static unsigned long _clk_fclk_get_rate(struct clk *clk)
253 {
254 unsigned long parent_rate;
255 u32 div;
256
257 div = (CSCR() & CCM_CSCR_PRESC_MASK) >> CCM_CSCR_PRESC_OFFSET;
258 parent_rate = clk_get_rate(clk->parent);
259
260 return parent_rate / (div+1);
261 }
262
263 static struct clk fclk_clk = {
264 .parent = &mpll_clk,
265 .get_rate = _clk_fclk_get_rate
266 };
267
268 static unsigned long get_spll_clk(struct clk *clk)
269 {
270 uint32_t reg;
271 unsigned long ref_clk;
272 unsigned long mfi = 0, mfn = 0, mfd = 0, pdf = 0;
273 unsigned long long temp;
274
275 ref_clk = clk_get_rate(clk->parent);
276
277 reg = __raw_readl(CCM_SPCTL0);
278 pdf = (reg & CCM_SPCTL0_PD_MASK) >> CCM_SPCTL0_PD_OFFSET;
279 mfd = (reg & CCM_SPCTL0_MFD_MASK) >> CCM_SPCTL0_MFD_OFFSET;
280 mfi = (reg & CCM_SPCTL0_MFI_MASK) >> CCM_SPCTL0_MFI_OFFSET;
281 mfn = (reg & CCM_SPCTL0_MFN_MASK) >> CCM_SPCTL0_MFN_OFFSET;
282
283 mfi = (mfi <= 5) ? 5 : mfi;
284 temp = 2LL * ref_clk * mfn;
285 do_div(temp, mfd + 1);
286 temp = 2LL * ref_clk * mfi + temp;
287 do_div(temp, pdf + 1);
288
289 return (unsigned long)temp;
290 }
291
292 static struct clk spll_clk = {
293 .parent = &ckih_clk,
294 .get_rate = get_spll_clk,
295 .enable = _clk_spll_enable,
296 .disable = _clk_spll_disable,
297 };
298
299 static unsigned long get_hclk_clk(struct clk *clk)
300 {
301 unsigned long rate;
302 unsigned long bclk_pdf;
303
304 bclk_pdf = (CSCR() & CCM_CSCR_BCLK_MASK)
305 >> CCM_CSCR_BCLK_OFFSET;
306
307 rate = clk_get_rate(clk->parent);
308 return rate / (bclk_pdf + 1);
309 }
310
311 static struct clk hclk_clk = {
312 .parent = &fclk_clk,
313 .get_rate = get_hclk_clk,
314 };
315
316 static unsigned long get_ipg_clk(struct clk *clk)
317 {
318 unsigned long rate;
319 unsigned long ipg_pdf;
320
321 ipg_pdf = (CSCR() & CCM_CSCR_IPDIV) >> CCM_CSCR_IPDIV_OFFSET;
322
323 rate = clk_get_rate(clk->parent);
324 return rate / (ipg_pdf + 1);
325 }
326
327 static struct clk ipg_clk = {
328 .parent = &hclk_clk,
329 .get_rate = get_ipg_clk,
330 };
331
332 static unsigned long _clk_perclkx_recalc(struct clk *clk)
333 {
334 unsigned long perclk_pdf;
335 unsigned long parent_rate;
336
337 parent_rate = clk_get_rate(clk->parent);
338
339 if (clk->id < 0 || clk->id > 3)
340 return 0;
341
342 perclk_pdf = (PCDR1() >> (clk->id << 3)) & CCM_PCDR1_PERDIV1_MASK;
343
344 return parent_rate / (perclk_pdf + 1);
345 }
346
347 static struct clk per_clk[] = {
348 {
349 .id = 0,
350 .parent = &mpll_clk,
351 .get_rate = _clk_perclkx_recalc,
352 }, {
353 .id = 1,
354 .parent = &mpll_clk,
355 .get_rate = _clk_perclkx_recalc,
356 }, {
357 .id = 2,
358 .parent = &mpll_clk,
359 .round_rate = _clk_perclkx_round_rate,
360 .set_rate = _clk_perclkx_set_rate,
361 .get_rate = _clk_perclkx_recalc,
362 /* Enable/Disable done via lcd_clkc[1] */
363 }, {
364 .id = 3,
365 .parent = &mpll_clk,
366 .round_rate = _clk_perclkx_round_rate,
367 .set_rate = _clk_perclkx_set_rate,
368 .get_rate = _clk_perclkx_recalc,
369 /* Enable/Disable done via csi_clk[1] */
370 },
371 };
372
373 static struct clk uart_ipg_clk[];
374
375 static struct clk uart_clk[] = {
376 {
377 .id = 0,
378 .parent = &per_clk[0],
379 .secondary = &uart_ipg_clk[0],
380 }, {
381 .id = 1,
382 .parent = &per_clk[0],
383 .secondary = &uart_ipg_clk[1],
384 }, {
385 .id = 2,
386 .parent = &per_clk[0],
387 .secondary = &uart_ipg_clk[2],
388 }, {
389 .id = 3,
390 .parent = &per_clk[0],
391 .secondary = &uart_ipg_clk[3],
392 },
393 };
394
395 static struct clk uart_ipg_clk[] = {
396 {
397 .id = 0,
398 .parent = &ipg_clk,
399 .enable = _clk_enable,
400 .enable_reg = CCM_PCCR_UART1_REG,
401 .enable_shift = CCM_PCCR_UART1_OFFSET,
402 .disable = _clk_disable,
403 }, {
404 .id = 1,
405 .parent = &ipg_clk,
406 .enable = _clk_enable,
407 .enable_reg = CCM_PCCR_UART2_REG,
408 .enable_shift = CCM_PCCR_UART2_OFFSET,
409 .disable = _clk_disable,
410 }, {
411 .id = 2,
412 .parent = &ipg_clk,
413 .enable = _clk_enable,
414 .enable_reg = CCM_PCCR_UART3_REG,
415 .enable_shift = CCM_PCCR_UART3_OFFSET,
416 .disable = _clk_disable,
417 }, {
418 .id = 3,
419 .parent = &ipg_clk,
420 .enable = _clk_enable,
421 .enable_reg = CCM_PCCR_UART4_REG,
422 .enable_shift = CCM_PCCR_UART4_OFFSET,
423 .disable = _clk_disable,
424 },
425 };
426
427 static struct clk gpt_ipg_clk[];
428
429 static struct clk gpt_clk[] = {
430 {
431 .id = 0,
432 .parent = &per_clk[0],
433 .secondary = &gpt_ipg_clk[0],
434 }, {
435 .id = 1,
436 .parent = &per_clk[0],
437 .secondary = &gpt_ipg_clk[1],
438 }, {
439 .id = 2,
440 .parent = &per_clk[0],
441 .secondary = &gpt_ipg_clk[2],
442 },
443 };
444
445 static struct clk gpt_ipg_clk[] = {
446 {
447 .id = 0,
448 .parent = &ipg_clk,
449 .enable = _clk_enable,
450 .enable_reg = CCM_PCCR_GPT1_REG,
451 .enable_shift = CCM_PCCR_GPT1_OFFSET,
452 .disable = _clk_disable,
453 }, {
454 .id = 1,
455 .parent = &ipg_clk,
456 .enable = _clk_enable,
457 .enable_reg = CCM_PCCR_GPT2_REG,
458 .enable_shift = CCM_PCCR_GPT2_OFFSET,
459 .disable = _clk_disable,
460 }, {
461 .id = 2,
462 .parent = &ipg_clk,
463 .enable = _clk_enable,
464 .enable_reg = CCM_PCCR_GPT3_REG,
465 .enable_shift = CCM_PCCR_GPT3_OFFSET,
466 .disable = _clk_disable,
467 },
468 };
469
470 static struct clk pwm_clk[] = {
471 {
472 .parent = &per_clk[0],
473 .secondary = &pwm_clk[1],
474 }, {
475 .parent = &ipg_clk,
476 .enable = _clk_enable,
477 .enable_reg = CCM_PCCR_PWM_REG,
478 .enable_shift = CCM_PCCR_PWM_OFFSET,
479 .disable = _clk_disable,
480 },
481 };
482
483 static struct clk sdhc_ipg_clk[];
484
485 static struct clk sdhc_clk[] = {
486 {
487 .id = 0,
488 .parent = &per_clk[1],
489 .secondary = &sdhc_ipg_clk[0],
490 }, {
491 .id = 1,
492 .parent = &per_clk[1],
493 .secondary = &sdhc_ipg_clk[1],
494 },
495 };
496
497 static struct clk sdhc_ipg_clk[] = {
498 {
499 .id = 0,
500 .parent = &ipg_clk,
501 .enable = _clk_enable,
502 .enable_reg = CCM_PCCR_SDHC1_REG,
503 .enable_shift = CCM_PCCR_SDHC1_OFFSET,
504 .disable = _clk_disable,
505 }, {
506 .id = 1,
507 .parent = &ipg_clk,
508 .enable = _clk_enable,
509 .enable_reg = CCM_PCCR_SDHC2_REG,
510 .enable_shift = CCM_PCCR_SDHC2_OFFSET,
511 .disable = _clk_disable,
512 },
513 };
514
515 static struct clk cspi_ipg_clk[];
516
517 static struct clk cspi_clk[] = {
518 {
519 .id = 0,
520 .parent = &per_clk[1],
521 .secondary = &cspi_ipg_clk[0],
522 }, {
523 .id = 1,
524 .parent = &per_clk[1],
525 .secondary = &cspi_ipg_clk[1],
526 }, {
527 .id = 2,
528 .parent = &per_clk[1],
529 .secondary = &cspi_ipg_clk[2],
530 },
531 };
532
533 static struct clk cspi_ipg_clk[] = {
534 {
535 .id = 0,
536 .parent = &ipg_clk,
537 .enable = _clk_enable,
538 .enable_reg = CCM_PCCR_CSPI1_REG,
539 .enable_shift = CCM_PCCR_CSPI1_OFFSET,
540 .disable = _clk_disable,
541 }, {
542 .id = 1,
543 .parent = &ipg_clk,
544 .enable = _clk_enable,
545 .enable_reg = CCM_PCCR_CSPI2_REG,
546 .enable_shift = CCM_PCCR_CSPI2_OFFSET,
547 .disable = _clk_disable,
548 }, {
549 .id = 3,
550 .parent = &ipg_clk,
551 .enable = _clk_enable,
552 .enable_reg = CCM_PCCR_CSPI3_REG,
553 .enable_shift = CCM_PCCR_CSPI3_OFFSET,
554 .disable = _clk_disable,
555 },
556 };
557
558 static struct clk lcdc_clk[] = {
559 {
560 .parent = &per_clk[2],
561 .secondary = &lcdc_clk[1],
562 .round_rate = _clk_parent_round_rate,
563 .set_rate = _clk_parent_set_rate,
564 }, {
565 .parent = &ipg_clk,
566 .secondary = &lcdc_clk[2],
567 .enable = _clk_enable,
568 .enable_reg = CCM_PCCR_LCDC_REG,
569 .enable_shift = CCM_PCCR_LCDC_OFFSET,
570 .disable = _clk_disable,
571 }, {
572 .parent = &hclk_clk,
573 .enable = _clk_enable,
574 .enable_reg = CCM_PCCR_HCLK_LCDC_REG,
575 .enable_shift = CCM_PCCR_HCLK_LCDC_OFFSET,
576 .disable = _clk_disable,
577 },
578 };
579
580 static struct clk csi_clk[] = {
581 {
582 .parent = &per_clk[3],
583 .secondary = &csi_clk[1],
584 .round_rate = _clk_parent_round_rate,
585 .set_rate = _clk_parent_set_rate,
586 }, {
587 .parent = &hclk_clk,
588 .enable = _clk_enable,
589 .enable_reg = CCM_PCCR_HCLK_CSI_REG,
590 .enable_shift = CCM_PCCR_HCLK_CSI_OFFSET,
591 .disable = _clk_disable,
592 },
593 };
594
595 static struct clk usb_clk[] = {
596 {
597 .parent = &spll_clk,
598 .get_rate = _clk_usb_recalc,
599 .enable = _clk_enable,
600 .enable_reg = CCM_PCCR_USBOTG_REG,
601 .enable_shift = CCM_PCCR_USBOTG_OFFSET,
602 .disable = _clk_disable,
603 }, {
604 .parent = &hclk_clk,
605 .enable = _clk_enable,
606 .enable_reg = CCM_PCCR_HCLK_USBOTG_REG,
607 .enable_shift = CCM_PCCR_HCLK_USBOTG_OFFSET,
608 .disable = _clk_disable,
609 }
610 };
611
612 static struct clk ssi_ipg_clk[];
613
614 static struct clk ssi_clk[] = {
615 {
616 .id = 0,
617 .parent = &mpll_clk,
618 .secondary = &ssi_ipg_clk[0],
619 .get_rate = _clk_ssi1_recalc,
620 .enable = _clk_enable,
621 .enable_reg = CCM_PCCR_SSI1_BAUD_REG,
622 .enable_shift = CCM_PCCR_SSI1_BAUD_OFFSET,
623 .disable = _clk_disable,
624 }, {
625 .id = 1,
626 .parent = &mpll_clk,
627 .secondary = &ssi_ipg_clk[1],
628 .get_rate = _clk_ssi2_recalc,
629 .enable = _clk_enable,
630 .enable_reg = CCM_PCCR_SSI2_BAUD_REG,
631 .enable_shift = CCM_PCCR_SSI2_BAUD_OFFSET,
632 .disable = _clk_disable,
633 },
634 };
635
636 static struct clk ssi_ipg_clk[] = {
637 {
638 .id = 0,
639 .parent = &ipg_clk,
640 .enable = _clk_enable,
641 .enable_reg = CCM_PCCR_SSI1_REG,
642 .enable_shift = CCM_PCCR_SSI1_IPG_OFFSET,
643 .disable = _clk_disable,
644 }, {
645 .id = 1,
646 .parent = &ipg_clk,
647 .enable = _clk_enable,
648 .enable_reg = CCM_PCCR_SSI2_REG,
649 .enable_shift = CCM_PCCR_SSI2_IPG_OFFSET,
650 .disable = _clk_disable,
651 },
652 };
653
654
655 static struct clk nfc_clk = {
656 .parent = &fclk_clk,
657 .get_rate = _clk_nfc_recalc,
658 .enable = _clk_enable,
659 .enable_reg = CCM_PCCR_NFC_REG,
660 .enable_shift = CCM_PCCR_NFC_OFFSET,
661 .disable = _clk_disable,
662 };
663
664 static struct clk dma_clk[] = {
665 {
666 .parent = &hclk_clk,
667 .enable = _clk_enable,
668 .enable_reg = CCM_PCCR_DMA_REG,
669 .enable_shift = CCM_PCCR_DMA_OFFSET,
670 .disable = _clk_disable,
671 .secondary = &dma_clk[1],
672 }, {
673 .enable = _clk_enable,
674 .enable_reg = CCM_PCCR_HCLK_DMA_REG,
675 .enable_shift = CCM_PCCR_HCLK_DMA_OFFSET,
676 .disable = _clk_disable,
677 },
678 };
679
680 static struct clk brom_clk = {
681 .parent = &hclk_clk,
682 .enable = _clk_enable,
683 .enable_reg = CCM_PCCR_HCLK_BROM_REG,
684 .enable_shift = CCM_PCCR_HCLK_BROM_OFFSET,
685 .disable = _clk_disable,
686 };
687
688 static struct clk emma_clk[] = {
689 {
690 .parent = &hclk_clk,
691 .enable = _clk_enable,
692 .enable_reg = CCM_PCCR_EMMA_REG,
693 .enable_shift = CCM_PCCR_EMMA_OFFSET,
694 .disable = _clk_disable,
695 .secondary = &emma_clk[1],
696 }, {
697 .enable = _clk_enable,
698 .enable_reg = CCM_PCCR_HCLK_EMMA_REG,
699 .enable_shift = CCM_PCCR_HCLK_EMMA_OFFSET,
700 .disable = _clk_disable,
701 }
702 };
703
704 static struct clk slcdc_clk[] = {
705 {
706 .parent = &hclk_clk,
707 .enable = _clk_enable,
708 .enable_reg = CCM_PCCR_SLCDC_REG,
709 .enable_shift = CCM_PCCR_SLCDC_OFFSET,
710 .disable = _clk_disable,
711 .secondary = &slcdc_clk[1],
712 }, {
713 .enable = _clk_enable,
714 .enable_reg = CCM_PCCR_HCLK_SLCDC_REG,
715 .enable_shift = CCM_PCCR_HCLK_SLCDC_OFFSET,
716 .disable = _clk_disable,
717 }
718 };
719
720 static struct clk wdog_clk = {
721 .parent = &ipg_clk,
722 .enable = _clk_enable,
723 .enable_reg = CCM_PCCR_WDT_REG,
724 .enable_shift = CCM_PCCR_WDT_OFFSET,
725 .disable = _clk_disable,
726 };
727
728 static struct clk gpio_clk = {
729 .parent = &ipg_clk,
730 .enable = _clk_enable,
731 .enable_reg = CCM_PCCR_GPIO_REG,
732 .enable_shift = CCM_PCCR_GPIO_OFFSET,
733 .disable = _clk_disable,
734 };
735
736 static struct clk i2c_clk = {
737 .id = 0,
738 .parent = &ipg_clk,
739 .enable = _clk_enable,
740 .enable_reg = CCM_PCCR_I2C1_REG,
741 .enable_shift = CCM_PCCR_I2C1_OFFSET,
742 .disable = _clk_disable,
743 };
744
745 static struct clk kpp_clk = {
746 .parent = &ipg_clk,
747 .enable = _clk_enable,
748 .enable_reg = CCM_PCCR_KPP_REG,
749 .enable_shift = CCM_PCCR_KPP_OFFSET,
750 .disable = _clk_disable,
751 };
752
753 static struct clk owire_clk = {
754 .parent = &ipg_clk,
755 .enable = _clk_enable,
756 .enable_reg = CCM_PCCR_OWIRE_REG,
757 .enable_shift = CCM_PCCR_OWIRE_OFFSET,
758 .disable = _clk_disable,
759 };
760
761 static struct clk rtc_clk = {
762 .parent = &ipg_clk,
763 .enable = _clk_enable,
764 .enable_reg = CCM_PCCR_RTC_REG,
765 .enable_shift = CCM_PCCR_RTC_OFFSET,
766 .disable = _clk_disable,
767 };
768
769 static unsigned long _clk_clko_round_rate(struct clk *clk, unsigned long rate)
770 {
771 u32 div;
772 unsigned long parent_rate;
773
774 parent_rate = clk_get_rate(clk->parent);
775 div = parent_rate / rate;
776 if (parent_rate % rate)
777 div++;
778
779 if (div > 8)
780 div = 8;
781
782 return parent_rate / div;
783 }
784
785 static int _clk_clko_set_rate(struct clk *clk, unsigned long rate)
786 {
787 u32 reg;
788 u32 div;
789 unsigned long parent_rate;
790
791 parent_rate = clk_get_rate(clk->parent);
792
793 div = parent_rate / rate;
794
795 if (div > 8 || div < 1 || ((parent_rate / div) != rate))
796 return -EINVAL;
797 div--;
798
799 reg = __raw_readl(CCM_PCDR0);
800
801 if (clk->parent == &usb_clk[0]) {
802 reg &= ~CCM_PCDR0_48MDIV_MASK;
803 reg |= div << CCM_PCDR0_48MDIV_OFFSET;
804 }
805 __raw_writel(reg, CCM_PCDR0);
806
807 return 0;
808 }
809
810 static unsigned long _clk_clko_recalc(struct clk *clk)
811 {
812 u32 div = 0;
813 unsigned long parent_rate;
814
815 parent_rate = clk_get_rate(clk->parent);
816
817 if (clk->parent == &usb_clk[0]) /* 48M */
818 div = __raw_readl(CCM_PCDR0) & CCM_PCDR0_48MDIV_MASK
819 >> CCM_PCDR0_48MDIV_OFFSET;
820 div++;
821
822 return parent_rate / div;
823 }
824
825 static struct clk clko_clk;
826
827 static int _clk_clko_set_parent(struct clk *clk, struct clk *parent)
828 {
829 u32 reg;
830
831 reg = __raw_readl(CCM_CCSR) & ~CCM_CCSR_CLKOSEL_MASK;
832
833 if (parent == &ckil_clk)
834 reg |= 0 << CCM_CCSR_CLKOSEL_OFFSET;
835 else if (parent == &fpm_clk)
836 reg |= 1 << CCM_CCSR_CLKOSEL_OFFSET;
837 else if (parent == &ckih_clk)
838 reg |= 2 << CCM_CCSR_CLKOSEL_OFFSET;
839 else if (parent == mpll_clk.parent)
840 reg |= 3 << CCM_CCSR_CLKOSEL_OFFSET;
841 else if (parent == spll_clk.parent)
842 reg |= 4 << CCM_CCSR_CLKOSEL_OFFSET;
843 else if (parent == &mpll_clk)
844 reg |= 5 << CCM_CCSR_CLKOSEL_OFFSET;
845 else if (parent == &spll_clk)
846 reg |= 6 << CCM_CCSR_CLKOSEL_OFFSET;
847 else if (parent == &fclk_clk)
848 reg |= 7 << CCM_CCSR_CLKOSEL_OFFSET;
849 else if (parent == &hclk_clk)
850 reg |= 8 << CCM_CCSR_CLKOSEL_OFFSET;
851 else if (parent == &ipg_clk)
852 reg |= 9 << CCM_CCSR_CLKOSEL_OFFSET;
853 else if (parent == &per_clk[0])
854 reg |= 0xA << CCM_CCSR_CLKOSEL_OFFSET;
855 else if (parent == &per_clk[1])
856 reg |= 0xB << CCM_CCSR_CLKOSEL_OFFSET;
857 else if (parent == &per_clk[2])
858 reg |= 0xC << CCM_CCSR_CLKOSEL_OFFSET;
859 else if (parent == &per_clk[3])
860 reg |= 0xD << CCM_CCSR_CLKOSEL_OFFSET;
861 else if (parent == &ssi_clk[0])
862 reg |= 0xE << CCM_CCSR_CLKOSEL_OFFSET;
863 else if (parent == &ssi_clk[1])
864 reg |= 0xF << CCM_CCSR_CLKOSEL_OFFSET;
865 else if (parent == &nfc_clk)
866 reg |= 0x10 << CCM_CCSR_CLKOSEL_OFFSET;
867 else if (parent == &usb_clk[0])
868 reg |= 0x14 << CCM_CCSR_CLKOSEL_OFFSET;
869 else if (parent == &clko_clk)
870 reg |= 0x15 << CCM_CCSR_CLKOSEL_OFFSET;
871 else
872 return -EINVAL;
873
874 __raw_writel(reg, CCM_CCSR);
875
876 return 0;
877 }
878
879 static struct clk clko_clk = {
880 .get_rate = _clk_clko_recalc,
881 .set_rate = _clk_clko_set_rate,
882 .round_rate = _clk_clko_round_rate,
883 .set_parent = _clk_clko_set_parent,
884 };
885
886
887 #define _REGISTER_CLOCK(d, n, c) \
888 { \
889 .dev_id = d, \
890 .con_id = n, \
891 .clk = &c, \
892 },
893 static struct clk_lookup lookups[] __initdata = {
894 /* It's unlikely that any driver wants one of them directly:
895 _REGISTER_CLOCK(NULL, "ckih", ckih_clk)
896 _REGISTER_CLOCK(NULL, "ckil", ckil_clk)
897 _REGISTER_CLOCK(NULL, "fpm", fpm_clk)
898 _REGISTER_CLOCK(NULL, "mpll", mpll_clk)
899 _REGISTER_CLOCK(NULL, "spll", spll_clk)
900 _REGISTER_CLOCK(NULL, "fclk", fclk_clk)
901 _REGISTER_CLOCK(NULL, "hclk", hclk_clk)
902 _REGISTER_CLOCK(NULL, "ipg", ipg_clk)
903 */
904 _REGISTER_CLOCK(NULL, "perclk1", per_clk[0])
905 _REGISTER_CLOCK(NULL, "perclk2", per_clk[1])
906 _REGISTER_CLOCK(NULL, "perclk3", per_clk[2])
907 _REGISTER_CLOCK(NULL, "perclk4", per_clk[3])
908 _REGISTER_CLOCK(NULL, "clko", clko_clk)
909 _REGISTER_CLOCK("imx-uart.0", NULL, uart_clk[0])
910 _REGISTER_CLOCK("imx-uart.1", NULL, uart_clk[1])
911 _REGISTER_CLOCK("imx-uart.2", NULL, uart_clk[2])
912 _REGISTER_CLOCK("imx-uart.3", NULL, uart_clk[3])
913 _REGISTER_CLOCK(NULL, "gpt1", gpt_clk[0])
914 _REGISTER_CLOCK(NULL, "gpt1", gpt_clk[1])
915 _REGISTER_CLOCK(NULL, "gpt1", gpt_clk[2])
916 _REGISTER_CLOCK(NULL, "pwm", pwm_clk[0])
917 _REGISTER_CLOCK(NULL, "sdhc1", sdhc_clk[0])
918 _REGISTER_CLOCK(NULL, "sdhc2", sdhc_clk[1])
919 _REGISTER_CLOCK(NULL, "cspi1", cspi_clk[0])
920 _REGISTER_CLOCK(NULL, "cspi2", cspi_clk[1])
921 _REGISTER_CLOCK(NULL, "cspi3", cspi_clk[2])
922 _REGISTER_CLOCK("imx-fb.0", NULL, lcdc_clk[0])
923 _REGISTER_CLOCK(NULL, "csi", csi_clk[0])
924 _REGISTER_CLOCK(NULL, "usb", usb_clk[0])
925 _REGISTER_CLOCK(NULL, "ssi1", ssi_clk[0])
926 _REGISTER_CLOCK(NULL, "ssi2", ssi_clk[1])
927 _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
928 _REGISTER_CLOCK(NULL, "dma", dma_clk[0])
929 _REGISTER_CLOCK(NULL, "brom", brom_clk)
930 _REGISTER_CLOCK(NULL, "emma", emma_clk[0])
931 _REGISTER_CLOCK(NULL, "slcdc", slcdc_clk[0])
932 _REGISTER_CLOCK("imx-wdt.0", NULL, wdog_clk)
933 _REGISTER_CLOCK(NULL, "gpio", gpio_clk)
934 _REGISTER_CLOCK("imx-i2c.0", NULL, i2c_clk)
935 _REGISTER_CLOCK("mxc-keypad", NULL, kpp_clk)
936 _REGISTER_CLOCK(NULL, "owire", owire_clk)
937 _REGISTER_CLOCK(NULL, "rtc", rtc_clk)
938 };
939
940 /*
941 * must be called very early to get information about the
942 * available clock rate when the timer framework starts
943 */
944 int __init mx21_clocks_init(unsigned long lref, unsigned long href)
945 {
946 int i;
947 u32 cscr;
948
949 external_low_reference = lref;
950 external_high_reference = href;
951
952 /* detect clock reference for both system PLL */
953 cscr = CSCR();
954 if (cscr & CCM_CSCR_MCU)
955 mpll_clk.parent = &ckih_clk;
956 else
957 mpll_clk.parent = &fpm_clk;
958
959 if (cscr & CCM_CSCR_SP)
960 spll_clk.parent = &ckih_clk;
961 else
962 spll_clk.parent = &fpm_clk;
963
964 for (i = 0; i < ARRAY_SIZE(lookups); i++)
965 clkdev_add(&lookups[i]);
966
967 /* Turn off all clock gates */
968 __raw_writel(0, CCM_PCCR0);
969 __raw_writel(CCM_PCCR_GPT1_MASK, CCM_PCCR1);
970
971 /* This turns of the serial PLL as well */
972 spll_clk.disable(&spll_clk);
973
974 /* This will propagate to all children and init all the clock rates. */
975 clk_enable(&per_clk[0]);
976 clk_enable(&gpio_clk);
977
978 #ifdef CONFIG_DEBUG_LL_CONSOLE
979 clk_enable(&uart_clk[0]);
980 #endif
981
982 mxc_timer_init(&gpt_clk[0]);
983 return 0;
984 }
Linux for Ginger Game Console