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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / arm / mach-mxs / clock-mx28.c
blob5dcc59d5b9ec9feab991fc34302273702388b21e
1 /*
2 * Copyright (C) 2009-2010 Freescale Semiconductor, Inc. All Rights Reserved.
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #include <linux/mm.h>
20 #include <linux/delay.h>
21 #include <linux/clk.h>
22 #include <linux/io.h>
23 #include <linux/jiffies.h>
24 #include <linux/clkdev.h>
25
26 #include <asm/clkdev.h>
27 #include <asm/div64.h>
28
29 #include <mach/mx28.h>
30 #include <mach/common.h>
31 #include <mach/clock.h>
32
33 #include "regs-clkctrl-mx28.h"
34
35 #define CLKCTRL_BASE_ADDR MX28_IO_ADDRESS(MX28_CLKCTRL_BASE_ADDR)
36 #define DIGCTRL_BASE_ADDR MX28_IO_ADDRESS(MX28_DIGCTL_BASE_ADDR)
37
38 #define PARENT_RATE_SHIFT 8
39
40 static struct clk pll2_clk;
41 static struct clk cpu_clk;
42 static struct clk emi_clk;
43 static struct clk saif0_clk;
44 static struct clk saif1_clk;
45 static struct clk clk32k_clk;
46
47 static int _raw_clk_enable(struct clk *clk)
48 {
49 u32 reg;
50
51 if (clk->enable_reg) {
52 reg = __raw_readl(clk->enable_reg);
53 reg &= ~(1 << clk->enable_shift);
54 __raw_writel(reg, clk->enable_reg);
55 }
56
57 return 0;
58 }
59
60 static void _raw_clk_disable(struct clk *clk)
61 {
62 u32 reg;
63
64 if (clk->enable_reg) {
65 reg = __raw_readl(clk->enable_reg);
66 reg |= 1 << clk->enable_shift;
67 __raw_writel(reg, clk->enable_reg);
68 }
69 }
70
71 /*
72 * ref_xtal_clk
73 */
74 static unsigned long ref_xtal_clk_get_rate(struct clk *clk)
75 {
76 return 24000000;
77 }
78
79 static struct clk ref_xtal_clk = {
80 .get_rate = ref_xtal_clk_get_rate,
81 };
82
83 /*
84 * pll_clk
85 */
86 static unsigned long pll0_clk_get_rate(struct clk *clk)
87 {
88 return 480000000;
89 }
90
91 static unsigned long pll1_clk_get_rate(struct clk *clk)
92 {
93 return 480000000;
94 }
95
96 static unsigned long pll2_clk_get_rate(struct clk *clk)
97 {
98 return 50000000;
99 }
100
101 #define _CLK_ENABLE_PLL(name, r, g) \
102 static int name##_enable(struct clk *clk) \
103 { \
104 __raw_writel(BM_CLKCTRL_##r##CTRL0_POWER, \
105 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \
106 udelay(10); \
107 \
108 if (clk == &pll2_clk) \
109 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
110 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \
111 else \
112 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
113 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \
114 \
115 return 0; \
116 }
117
118 _CLK_ENABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS)
119 _CLK_ENABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS)
120 _CLK_ENABLE_PLL(pll2_clk, PLL2, CLKGATE)
121
122 #define _CLK_DISABLE_PLL(name, r, g) \
123 static void name##_disable(struct clk *clk) \
124 { \
125 __raw_writel(BM_CLKCTRL_##r##CTRL0_POWER, \
126 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \
127 \
128 if (clk == &pll2_clk) \
129 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
130 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \
131 else \
132 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
133 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \
134 \
135 }
136
137 _CLK_DISABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS)
138 _CLK_DISABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS)
139 _CLK_DISABLE_PLL(pll2_clk, PLL2, CLKGATE)
140
141 #define _DEFINE_CLOCK_PLL(name) \
142 static struct clk name = { \
143 .get_rate = name##_get_rate, \
144 .enable = name##_enable, \
145 .disable = name##_disable, \
146 .parent = &ref_xtal_clk, \
147 }
148
149 _DEFINE_CLOCK_PLL(pll0_clk);
150 _DEFINE_CLOCK_PLL(pll1_clk);
151 _DEFINE_CLOCK_PLL(pll2_clk);
152
153 /*
154 * ref_clk
155 */
156 #define _CLK_GET_RATE_REF(name, sr, ss) \
157 static unsigned long name##_get_rate(struct clk *clk) \
158 { \
159 unsigned long parent_rate; \
160 u32 reg, div; \
161 \
162 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##sr); \
163 div = (reg >> BP_CLKCTRL_##sr##_##ss##FRAC) & 0x3f; \
164 parent_rate = clk_get_rate(clk->parent); \
165 \
166 return SH_DIV((parent_rate >> PARENT_RATE_SHIFT) * 18, \
167 div, PARENT_RATE_SHIFT); \
168 }
169
170 _CLK_GET_RATE_REF(ref_cpu_clk, FRAC0, CPU)
171 _CLK_GET_RATE_REF(ref_emi_clk, FRAC0, EMI)
172 _CLK_GET_RATE_REF(ref_io0_clk, FRAC0, IO0)
173 _CLK_GET_RATE_REF(ref_io1_clk, FRAC0, IO1)
174 _CLK_GET_RATE_REF(ref_pix_clk, FRAC1, PIX)
175 _CLK_GET_RATE_REF(ref_gpmi_clk, FRAC1, GPMI)
176
177 #define _DEFINE_CLOCK_REF(name, er, es) \
178 static struct clk name = { \
179 .enable_reg = CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er, \
180 .enable_shift = BP_CLKCTRL_##er##_CLKGATE##es, \
181 .get_rate = name##_get_rate, \
182 .enable = _raw_clk_enable, \
183 .disable = _raw_clk_disable, \
184 .parent = &pll0_clk, \
185 }
186
187 _DEFINE_CLOCK_REF(ref_cpu_clk, FRAC0, CPU);
188 _DEFINE_CLOCK_REF(ref_emi_clk, FRAC0, EMI);
189 _DEFINE_CLOCK_REF(ref_io0_clk, FRAC0, IO0);
190 _DEFINE_CLOCK_REF(ref_io1_clk, FRAC0, IO1);
191 _DEFINE_CLOCK_REF(ref_pix_clk, FRAC1, PIX);
192 _DEFINE_CLOCK_REF(ref_gpmi_clk, FRAC1, GPMI);
193
194 /*
195 * General clocks
196 *
197 * clk_get_rate
198 */
199 static unsigned long lradc_clk_get_rate(struct clk *clk)
200 {
201 return clk_get_rate(clk->parent) / 16;
202 }
203
204 static unsigned long rtc_clk_get_rate(struct clk *clk)
205 {
206 /* ref_xtal_clk is implemented as the only parent */
207 return clk_get_rate(clk->parent) / 768;
208 }
209
210 static unsigned long clk32k_clk_get_rate(struct clk *clk)
211 {
212 return clk->parent->get_rate(clk->parent) / 750;
213 }
214
215 static unsigned long spdif_clk_get_rate(struct clk *clk)
216 {
217 return clk_get_rate(clk->parent) / 4;
218 }
219
220 #define _CLK_GET_RATE(name, rs) \
221 static unsigned long name##_get_rate(struct clk *clk) \
222 { \
223 u32 reg, div; \
224 \
225 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
226 \
227 if (clk->parent == &ref_xtal_clk) \
228 div = (reg & BM_CLKCTRL_##rs##_DIV_XTAL) >> \
229 BP_CLKCTRL_##rs##_DIV_XTAL; \
230 else \
231 div = (reg & BM_CLKCTRL_##rs##_DIV_##rs) >> \
232 BP_CLKCTRL_##rs##_DIV_##rs; \
233 \
234 if (!div) \
235 return -EINVAL; \
236 \
237 return clk_get_rate(clk->parent) / div; \
238 }
239
240 _CLK_GET_RATE(cpu_clk, CPU)
241 _CLK_GET_RATE(emi_clk, EMI)
242
243 #define _CLK_GET_RATE1(name, rs) \
244 static unsigned long name##_get_rate(struct clk *clk) \
245 { \
246 u32 reg, div; \
247 \
248 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
249 div = (reg & BM_CLKCTRL_##rs##_DIV) >> BP_CLKCTRL_##rs##_DIV; \
250 \
251 if (!div) \
252 return -EINVAL; \
253 \
254 if (clk == &saif0_clk || clk == &saif1_clk) \
255 return clk_get_rate(clk->parent) >> 16 * div; \
256 else \
257 return clk_get_rate(clk->parent) / div; \
258 }
259
260 _CLK_GET_RATE1(hbus_clk, HBUS)
261 _CLK_GET_RATE1(xbus_clk, XBUS)
262 _CLK_GET_RATE1(ssp0_clk, SSP0)
263 _CLK_GET_RATE1(ssp1_clk, SSP1)
264 _CLK_GET_RATE1(ssp2_clk, SSP2)
265 _CLK_GET_RATE1(ssp3_clk, SSP3)
266 _CLK_GET_RATE1(gpmi_clk, GPMI)
267 _CLK_GET_RATE1(lcdif_clk, DIS_LCDIF)
268 _CLK_GET_RATE1(saif0_clk, SAIF0)
269 _CLK_GET_RATE1(saif1_clk, SAIF1)
270
271 #define _CLK_GET_RATE_STUB(name) \
272 static unsigned long name##_get_rate(struct clk *clk) \
273 { \
274 return clk_get_rate(clk->parent); \
275 }
276
277 _CLK_GET_RATE_STUB(uart_clk)
278 _CLK_GET_RATE_STUB(pwm_clk)
279 _CLK_GET_RATE_STUB(can0_clk)
280 _CLK_GET_RATE_STUB(can1_clk)
281 _CLK_GET_RATE_STUB(fec_clk)
282
283 /*
284 * clk_set_rate
285 */
286 /* fool compiler */
287 #define BM_CLKCTRL_CPU_DIV 0
288 #define BP_CLKCTRL_CPU_DIV 0
289 #define BM_CLKCTRL_CPU_BUSY 0
290
291 #define _CLK_SET_RATE(name, dr, fr, fs) \
292 static int name##_set_rate(struct clk *clk, unsigned long rate) \
293 { \
294 u32 reg, bm_busy, div_max, d, f, div, frac; \
295 unsigned long diff, parent_rate, calc_rate; \
296 int i; \
297 \
298 div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV; \
299 bm_busy = BM_CLKCTRL_##dr##_BUSY; \
300 \
301 if (clk->parent == &ref_xtal_clk) { \
302 parent_rate = clk_get_rate(clk->parent); \
303 div = DIV_ROUND_UP(parent_rate, rate); \
304 if (clk == &cpu_clk) { \
305 div_max = BM_CLKCTRL_CPU_DIV_XTAL >> \
306 BP_CLKCTRL_CPU_DIV_XTAL; \
307 bm_busy = BM_CLKCTRL_CPU_BUSY_REF_XTAL; \
308 } \
309 if (div == 0 || div > div_max) \
310 return -EINVAL; \
311 } else { \
312 /* \
313 * hack alert: this block modifies clk->parent, too, \
314 * so the base to use it the grand parent. \
315 */ \
316 parent_rate = clk_get_rate(clk->parent->parent); \
317 rate >>= PARENT_RATE_SHIFT; \
318 parent_rate >>= PARENT_RATE_SHIFT; \
319 diff = parent_rate; \
320 div = frac = 1; \
321 if (clk == &cpu_clk) { \
322 div_max = BM_CLKCTRL_CPU_DIV_CPU >> \
323 BP_CLKCTRL_CPU_DIV_CPU; \
324 bm_busy = BM_CLKCTRL_CPU_BUSY_REF_CPU; \
325 } \
326 for (d = 1; d <= div_max; d++) { \
327 f = parent_rate * 18 / d / rate; \
328 if ((parent_rate * 18 / d) % rate) \
329 f++; \
330 if (f < 18 || f > 35) \
331 continue; \
332 \
333 calc_rate = parent_rate * 18 / f / d; \
334 if (calc_rate > rate) \
335 continue; \
336 \
337 if (rate - calc_rate < diff) { \
338 frac = f; \
339 div = d; \
340 diff = rate - calc_rate; \
341 } \
342 \
343 if (diff == 0) \
344 break; \
345 } \
346 \
347 if (diff == parent_rate) \
348 return -EINVAL; \
349 \
350 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr); \
351 reg &= ~BM_CLKCTRL_##fr##_##fs##FRAC; \
352 reg |= frac; \
353 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr); \
354 } \
355 \
356 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
357 if (clk == &cpu_clk) { \
358 reg &= ~BM_CLKCTRL_CPU_DIV_CPU; \
359 reg |= div << BP_CLKCTRL_CPU_DIV_CPU; \
360 } else { \
361 reg &= ~BM_CLKCTRL_##dr##_DIV; \
362 reg |= div << BP_CLKCTRL_##dr##_DIV; \
363 if (reg & (1 << clk->enable_shift)) { \
364 pr_err("%s: clock is gated\n", __func__); \
365 return -EINVAL; \
366 } \
367 } \
368 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
369 \
370 for (i = 10000; i; i--) \
371 if (!(__raw_readl(CLKCTRL_BASE_ADDR + \
372 HW_CLKCTRL_##dr) & bm_busy)) \
373 break; \
374 if (!i) { \
375 pr_err("%s: divider writing timeout\n", __func__); \
376 return -ETIMEDOUT; \
377 } \
378 \
379 return 0; \
380 }
381
382 _CLK_SET_RATE(cpu_clk, CPU, FRAC0, CPU)
383 _CLK_SET_RATE(ssp0_clk, SSP0, FRAC0, IO0)
384 _CLK_SET_RATE(ssp1_clk, SSP1, FRAC0, IO0)
385 _CLK_SET_RATE(ssp2_clk, SSP2, FRAC0, IO1)
386 _CLK_SET_RATE(ssp3_clk, SSP3, FRAC0, IO1)
387 _CLK_SET_RATE(lcdif_clk, DIS_LCDIF, FRAC1, PIX)
388 _CLK_SET_RATE(gpmi_clk, GPMI, FRAC1, GPMI)
389
390 #define _CLK_SET_RATE1(name, dr) \
391 static int name##_set_rate(struct clk *clk, unsigned long rate) \
392 { \
393 u32 reg, div_max, div; \
394 unsigned long parent_rate; \
395 int i; \
396 \
397 parent_rate = clk_get_rate(clk->parent); \
398 div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV; \
399 \
400 div = DIV_ROUND_UP(parent_rate, rate); \
401 if (div == 0 || div > div_max) \
402 return -EINVAL; \
403 \
404 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
405 reg &= ~BM_CLKCTRL_##dr##_DIV; \
406 reg |= div << BP_CLKCTRL_##dr##_DIV; \
407 if (reg | (1 << clk->enable_shift)) { \
408 pr_err("%s: clock is gated\n", __func__); \
409 return -EINVAL; \
410 } \
411 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
412 \
413 for (i = 10000; i; i--) \
414 if (!(__raw_readl(CLKCTRL_BASE_ADDR + \
415 HW_CLKCTRL_##dr) & BM_CLKCTRL_##dr##_BUSY)) \
416 break; \
417 if (!i) { \
418 pr_err("%s: divider writing timeout\n", __func__); \
419 return -ETIMEDOUT; \
420 } \
421 \
422 return 0; \
423 }
424
425 _CLK_SET_RATE1(xbus_clk, XBUS)
426
427 /* saif clock uses 16 bits frac div */
428 #define _CLK_SET_RATE_SAIF(name, rs) \
429 static int name##_set_rate(struct clk *clk, unsigned long rate) \
430 { \
431 u16 div; \
432 u32 reg; \
433 u64 lrate; \
434 unsigned long parent_rate; \
435 int i; \
436 \
437 parent_rate = clk_get_rate(clk->parent); \
438 if (rate > parent_rate) \
439 return -EINVAL; \
440 \
441 lrate = (u64)rate << 16; \
442 do_div(lrate, parent_rate); \
443 div = (u16)lrate; \
444 \
445 if (!div) \
446 return -EINVAL; \
447 \
448 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
449 reg &= ~BM_CLKCTRL_##rs##_DIV; \
450 reg |= div << BP_CLKCTRL_##rs##_DIV; \
451 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
452 \
453 for (i = 10000; i; i--) \
454 if (!(__raw_readl(CLKCTRL_BASE_ADDR + \
455 HW_CLKCTRL_##rs) & BM_CLKCTRL_##rs##_BUSY)) \
456 break; \
457 if (!i) { \
458 pr_err("%s: divider writing timeout\n", __func__); \
459 return -ETIMEDOUT; \
460 } \
461 \
462 return 0; \
463 }
464
465 _CLK_SET_RATE_SAIF(saif0_clk, SAIF0)
466 _CLK_SET_RATE_SAIF(saif1_clk, SAIF1)
467
468 #define _CLK_SET_RATE_STUB(name) \
469 static int name##_set_rate(struct clk *clk, unsigned long rate) \
470 { \
471 return -EINVAL; \
472 }
473
474 _CLK_SET_RATE_STUB(emi_clk)
475 _CLK_SET_RATE_STUB(uart_clk)
476 _CLK_SET_RATE_STUB(pwm_clk)
477 _CLK_SET_RATE_STUB(spdif_clk)
478 _CLK_SET_RATE_STUB(clk32k_clk)
479 _CLK_SET_RATE_STUB(can0_clk)
480 _CLK_SET_RATE_STUB(can1_clk)
481 _CLK_SET_RATE_STUB(fec_clk)
482
483 /*
484 * clk_set_parent
485 */
486 #define _CLK_SET_PARENT(name, bit) \
487 static int name##_set_parent(struct clk *clk, struct clk *parent) \
488 { \
489 if (parent != clk->parent) { \
490 __raw_writel(BM_CLKCTRL_CLKSEQ_BYPASS_##bit, \
491 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ_TOG); \
492 clk->parent = parent; \
493 } \
494 \
495 return 0; \
496 }
497
498 _CLK_SET_PARENT(cpu_clk, CPU)
499 _CLK_SET_PARENT(emi_clk, EMI)
500 _CLK_SET_PARENT(ssp0_clk, SSP0)
501 _CLK_SET_PARENT(ssp1_clk, SSP1)
502 _CLK_SET_PARENT(ssp2_clk, SSP2)
503 _CLK_SET_PARENT(ssp3_clk, SSP3)
504 _CLK_SET_PARENT(lcdif_clk, DIS_LCDIF)
505 _CLK_SET_PARENT(gpmi_clk, GPMI)
506 _CLK_SET_PARENT(saif0_clk, SAIF0)
507 _CLK_SET_PARENT(saif1_clk, SAIF1)
508
509 #define _CLK_SET_PARENT_STUB(name) \
510 static int name##_set_parent(struct clk *clk, struct clk *parent) \
511 { \
512 if (parent != clk->parent) \
513 return -EINVAL; \
514 else \
515 return 0; \
516 }
517
518 _CLK_SET_PARENT_STUB(pwm_clk)
519 _CLK_SET_PARENT_STUB(uart_clk)
520 _CLK_SET_PARENT_STUB(clk32k_clk)
521 _CLK_SET_PARENT_STUB(spdif_clk)
522 _CLK_SET_PARENT_STUB(fec_clk)
523 _CLK_SET_PARENT_STUB(can0_clk)
524 _CLK_SET_PARENT_STUB(can1_clk)
525
526 /*
527 * clk definition
528 */
529 static struct clk cpu_clk = {
530 .get_rate = cpu_clk_get_rate,
531 .set_rate = cpu_clk_set_rate,
532 .set_parent = cpu_clk_set_parent,
533 .parent = &ref_cpu_clk,
534 };
535
536 static struct clk hbus_clk = {
537 .get_rate = hbus_clk_get_rate,
538 .parent = &cpu_clk,
539 };
540
541 static struct clk xbus_clk = {
542 .get_rate = xbus_clk_get_rate,
543 .set_rate = xbus_clk_set_rate,
544 .parent = &ref_xtal_clk,
545 };
546
547 static struct clk lradc_clk = {
548 .get_rate = lradc_clk_get_rate,
549 .parent = &clk32k_clk,
550 };
551
552 static struct clk rtc_clk = {
553 .get_rate = rtc_clk_get_rate,
554 .parent = &ref_xtal_clk,
555 };
556
557 /* usb_clk gate is controlled in DIGCTRL other than CLKCTRL */
558 static struct clk usb0_clk = {
559 .enable_reg = DIGCTRL_BASE_ADDR,
560 .enable_shift = 2,
561 .enable = _raw_clk_enable,
562 .disable = _raw_clk_disable,
563 .parent = &pll0_clk,
564 };
565
566 static struct clk usb1_clk = {
567 .enable_reg = DIGCTRL_BASE_ADDR,
568 .enable_shift = 16,
569 .enable = _raw_clk_enable,
570 .disable = _raw_clk_disable,
571 .parent = &pll1_clk,
572 };
573
574 #define _DEFINE_CLOCK(name, er, es, p) \
575 static struct clk name = { \
576 .enable_reg = CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er, \
577 .enable_shift = BP_CLKCTRL_##er##_##es, \
578 .get_rate = name##_get_rate, \
579 .set_rate = name##_set_rate, \
580 .set_parent = name##_set_parent, \
581 .enable = _raw_clk_enable, \
582 .disable = _raw_clk_disable, \
583 .parent = p, \
584 }
585
586 _DEFINE_CLOCK(emi_clk, EMI, CLKGATE, &ref_xtal_clk);
587 _DEFINE_CLOCK(ssp0_clk, SSP0, CLKGATE, &ref_xtal_clk);
588 _DEFINE_CLOCK(ssp1_clk, SSP1, CLKGATE, &ref_xtal_clk);
589 _DEFINE_CLOCK(ssp2_clk, SSP2, CLKGATE, &ref_xtal_clk);
590 _DEFINE_CLOCK(ssp3_clk, SSP3, CLKGATE, &ref_xtal_clk);
591 _DEFINE_CLOCK(lcdif_clk, DIS_LCDIF, CLKGATE, &ref_xtal_clk);
592 _DEFINE_CLOCK(gpmi_clk, GPMI, CLKGATE, &ref_xtal_clk);
593 _DEFINE_CLOCK(saif0_clk, SAIF0, CLKGATE, &ref_xtal_clk);
594 _DEFINE_CLOCK(saif1_clk, SAIF1, CLKGATE, &ref_xtal_clk);
595 _DEFINE_CLOCK(can0_clk, FLEXCAN, STOP_CAN0, &ref_xtal_clk);
596 _DEFINE_CLOCK(can1_clk, FLEXCAN, STOP_CAN1, &ref_xtal_clk);
597 _DEFINE_CLOCK(pwm_clk, XTAL, PWM_CLK24M_GATE, &ref_xtal_clk);
598 _DEFINE_CLOCK(uart_clk, XTAL, UART_CLK_GATE, &ref_xtal_clk);
599 _DEFINE_CLOCK(clk32k_clk, XTAL, TIMROT_CLK32K_GATE, &ref_xtal_clk);
600 _DEFINE_CLOCK(spdif_clk, SPDIF, CLKGATE, &pll0_clk);
601 _DEFINE_CLOCK(fec_clk, ENET, DISABLE, &hbus_clk);
602
603 #define _REGISTER_CLOCK(d, n, c) \
604 { \
605 .dev_id = d, \
606 .con_id = n, \
607 .clk = &c, \
608 },
609
610 static struct clk_lookup lookups[] = {
611 /* for amba bus driver */
612 _REGISTER_CLOCK("duart", "apb_pclk", xbus_clk)
613 /* for amba-pl011 driver */
614 _REGISTER_CLOCK("duart", NULL, uart_clk)
615 _REGISTER_CLOCK("imx28-fec.0", NULL, fec_clk)
616 _REGISTER_CLOCK("imx28-fec.1", NULL, fec_clk)
617 _REGISTER_CLOCK("mxs-auart.0", NULL, uart_clk)
618 _REGISTER_CLOCK("mxs-auart.1", NULL, uart_clk)
619 _REGISTER_CLOCK("mxs-auart.2", NULL, uart_clk)
620 _REGISTER_CLOCK("mxs-auart.3", NULL, uart_clk)
621 _REGISTER_CLOCK("mxs-auart.4", NULL, uart_clk)
622 _REGISTER_CLOCK("rtc", NULL, rtc_clk)
623 _REGISTER_CLOCK("pll2", NULL, pll2_clk)
624 _REGISTER_CLOCK("mxs-dma-apbh", NULL, hbus_clk)
625 _REGISTER_CLOCK("mxs-dma-apbx", NULL, xbus_clk)
626 _REGISTER_CLOCK("mxs-mmc.0", NULL, ssp0_clk)
627 _REGISTER_CLOCK("mxs-mmc.1", NULL, ssp1_clk)
628 _REGISTER_CLOCK("flexcan.0", NULL, can0_clk)
629 _REGISTER_CLOCK("flexcan.1", NULL, can1_clk)
630 _REGISTER_CLOCK(NULL, "usb0", usb0_clk)
631 _REGISTER_CLOCK(NULL, "usb1", usb1_clk)
632 _REGISTER_CLOCK("mxs-pwm.0", NULL, pwm_clk)
633 _REGISTER_CLOCK("mxs-pwm.1", NULL, pwm_clk)
634 _REGISTER_CLOCK("mxs-pwm.2", NULL, pwm_clk)
635 _REGISTER_CLOCK("mxs-pwm.3", NULL, pwm_clk)
636 _REGISTER_CLOCK("mxs-pwm.4", NULL, pwm_clk)
637 _REGISTER_CLOCK("mxs-pwm.5", NULL, pwm_clk)
638 _REGISTER_CLOCK("mxs-pwm.6", NULL, pwm_clk)
639 _REGISTER_CLOCK("mxs-pwm.7", NULL, pwm_clk)
640 _REGISTER_CLOCK(NULL, "lradc", lradc_clk)
641 _REGISTER_CLOCK(NULL, "spdif", spdif_clk)
642 _REGISTER_CLOCK("imx28-fb", NULL, lcdif_clk)
643 };
644
645 static int clk_misc_init(void)
646 {
647 u32 reg;
648 int i;
649
650 /* Fix up parent per register setting */
651 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ);
652 cpu_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_CPU) ?
653 &ref_xtal_clk : &ref_cpu_clk;
654 emi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_EMI) ?
655 &ref_xtal_clk : &ref_emi_clk;
656 ssp0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP0) ?
657 &ref_xtal_clk : &ref_io0_clk;
658 ssp1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP1) ?
659 &ref_xtal_clk : &ref_io0_clk;
660 ssp2_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP2) ?
661 &ref_xtal_clk : &ref_io1_clk;
662 ssp3_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP3) ?
663 &ref_xtal_clk : &ref_io1_clk;
664 lcdif_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_DIS_LCDIF) ?
665 &ref_xtal_clk : &ref_pix_clk;
666 gpmi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_GPMI) ?
667 &ref_xtal_clk : &ref_gpmi_clk;
668 saif0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF0) ?
669 &ref_xtal_clk : &pll0_clk;
670 saif1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF1) ?
671 &ref_xtal_clk : &pll0_clk;
672
673 /* Use int div over frac when both are available */
674 __raw_writel(BM_CLKCTRL_CPU_DIV_XTAL_FRAC_EN,
675 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR);
676 __raw_writel(BM_CLKCTRL_CPU_DIV_CPU_FRAC_EN,
677 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR);
678 __raw_writel(BM_CLKCTRL_HBUS_DIV_FRAC_EN,
679 CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS_CLR);
680
681 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS);
682 reg &= ~BM_CLKCTRL_XBUS_DIV_FRAC_EN;
683 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS);
684
685 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0);
686 reg &= ~BM_CLKCTRL_SSP0_DIV_FRAC_EN;
687 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0);
688
689 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1);
690 reg &= ~BM_CLKCTRL_SSP1_DIV_FRAC_EN;
691 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1);
692
693 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2);
694 reg &= ~BM_CLKCTRL_SSP2_DIV_FRAC_EN;
695 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2);
696
697 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3);
698 reg &= ~BM_CLKCTRL_SSP3_DIV_FRAC_EN;
699 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3);
700
701 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI);
702 reg &= ~BM_CLKCTRL_GPMI_DIV_FRAC_EN;
703 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI);
704
705 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF);
706 reg &= ~BM_CLKCTRL_DIS_LCDIF_DIV_FRAC_EN;
707 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF);
708
709 /* SAIF has to use frac div for functional operation */
710 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0);
711 reg &= ~BM_CLKCTRL_SAIF0_DIV_FRAC_EN;
712 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0);
713
714 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1);
715 reg &= ~BM_CLKCTRL_SAIF1_DIV_FRAC_EN;
716 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1);
717
718 /*
719 * Set safe hbus clock divider. A divider of 3 ensure that
720 * the Vddd voltage required for the cpu clock is sufficiently
721 * high for the hbus clock.
722 */
723 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS);
724 reg &= BM_CLKCTRL_HBUS_DIV;
725 reg |= 3 << BP_CLKCTRL_HBUS_DIV;
726 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS);
727
728 for (i = 10000; i; i--)
729 if (!(__raw_readl(CLKCTRL_BASE_ADDR +
730 HW_CLKCTRL_HBUS) & BM_CLKCTRL_HBUS_ASM_BUSY))
731 break;
732 if (!i) {
733 pr_err("%s: divider writing timeout\n", __func__);
734 return -ETIMEDOUT;
735 }
736
737 /* Gate off cpu clock in WFI for power saving */
738 __raw_writel(BM_CLKCTRL_CPU_INTERRUPT_WAIT,
739 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_SET);
740
741 /* Extra fec clock setting */
742 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
743 reg &= ~BM_CLKCTRL_ENET_SLEEP;
744 reg |= BM_CLKCTRL_ENET_CLK_OUT_EN;
745 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
746
747 /*
748 * 480 MHz seems too high to be ssp clock source directly,
749 * so set frac0 to get a 288 MHz ref_io0.
750 */
751 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC0);
752 reg &= ~BM_CLKCTRL_FRAC0_IO0FRAC;
753 reg |= 30 << BP_CLKCTRL_FRAC0_IO0FRAC;
754 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC0);
755
756 return 0;
757 }
758
759 int __init mx28_clocks_init(void)
760 {
761 clk_misc_init();
762
763 /*
764 * source ssp clock from ref_io0 than ref_xtal,
765 * as ref_xtal only provides 24 MHz as maximum.
766 */
767 clk_set_parent(&ssp0_clk, &ref_io0_clk);
768 clk_set_parent(&ssp1_clk, &ref_io0_clk);
769
770 clk_enable(&cpu_clk);
771 clk_enable(&hbus_clk);
772 clk_enable(&xbus_clk);
773 clk_enable(&emi_clk);
774 clk_enable(&uart_clk);
775
776 clk_set_parent(&lcdif_clk, &ref_pix_clk);
777
778 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
779
780 mxs_timer_init(&clk32k_clk, MX28_INT_TIMER0);
781
782 return 0;
783 }
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