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 #include <linux/spinlock.h>
26
27 #include <asm/clkdev.h>
28 #include <asm/div64.h>
29
30 #include <mach/mx28.h>
31 #include <mach/common.h>
32 #include <mach/clock.h>
33 #include <mach/digctl.h>
34
35 #include "regs-clkctrl-mx28.h"
36
37 #define CLKCTRL_BASE_ADDR MX28_IO_ADDRESS(MX28_CLKCTRL_BASE_ADDR)
38 #define DIGCTRL_BASE_ADDR MX28_IO_ADDRESS(MX28_DIGCTL_BASE_ADDR)
39
40 #define PARENT_RATE_SHIFT 8
41
42 static struct clk pll2_clk;
43 static struct clk cpu_clk;
44 static struct clk emi_clk;
45 static struct clk saif0_clk;
46 static struct clk saif1_clk;
47 static struct clk clk32k_clk;
48 static DEFINE_SPINLOCK(clkmux_lock);
49
50 /*
51 * HW_SAIF_CLKMUX_SEL:
52 * DIRECT(0x0): SAIF0 clock pins selected for SAIF0 input clocks, and SAIF1
53 * clock pins selected for SAIF1 input clocks.
54 * CROSSINPUT(0x1): SAIF1 clock inputs selected for SAIF0 input clocks, and
55 * SAIF0 clock inputs selected for SAIF1 input clocks.
56 * EXTMSTR0(0x2): SAIF0 clock pin selected for both SAIF0 and SAIF1 input
57 * clocks.
58 * EXTMSTR1(0x3): SAIF1 clock pin selected for both SAIF0 and SAIF1 input
59 * clocks.
60 */
mxs_saif_clkmux_select(unsigned int clkmux)61 int mxs_saif_clkmux_select(unsigned int clkmux)
62 {
63 if (clkmux > 0x3)
64 return -EINVAL;
65
66 spin_lock(&clkmux_lock);
67 __raw_writel(BM_DIGCTL_CTRL_SAIF_CLKMUX,
68 DIGCTRL_BASE_ADDR + HW_DIGCTL_CTRL + MXS_CLR_ADDR);
69 __raw_writel(clkmux << BP_DIGCTL_CTRL_SAIF_CLKMUX,
70 DIGCTRL_BASE_ADDR + HW_DIGCTL_CTRL + MXS_SET_ADDR);
71 spin_unlock(&clkmux_lock);
72
73 return 0;
74 }
75
_raw_clk_enable(struct clk * clk)76 static int _raw_clk_enable(struct clk *clk)
77 {
78 u32 reg;
79
80 if (clk->enable_reg) {
81 reg = __raw_readl(clk->enable_reg);
82 reg &= ~(1 << clk->enable_shift);
83 __raw_writel(reg, clk->enable_reg);
84 }
85
86 return 0;
87 }
88
_raw_clk_disable(struct clk * clk)89 static void _raw_clk_disable(struct clk *clk)
90 {
91 u32 reg;
92
93 if (clk->enable_reg) {
94 reg = __raw_readl(clk->enable_reg);
95 reg |= 1 << clk->enable_shift;
96 __raw_writel(reg, clk->enable_reg);
97 }
98 }
99
100 /*
101 * ref_xtal_clk
102 */
ref_xtal_clk_get_rate(struct clk * clk)103 static unsigned long ref_xtal_clk_get_rate(struct clk *clk)
104 {
105 return 24000000;
106 }
107
108 static struct clk ref_xtal_clk = {
109 .get_rate = ref_xtal_clk_get_rate,
110 };
111
112 /*
113 * pll_clk
114 */
pll0_clk_get_rate(struct clk * clk)115 static unsigned long pll0_clk_get_rate(struct clk *clk)
116 {
117 return 480000000;
118 }
119
pll1_clk_get_rate(struct clk * clk)120 static unsigned long pll1_clk_get_rate(struct clk *clk)
121 {
122 return 480000000;
123 }
124
pll2_clk_get_rate(struct clk * clk)125 static unsigned long pll2_clk_get_rate(struct clk *clk)
126 {
127 return 50000000;
128 }
129
130 #define _CLK_ENABLE_PLL(name, r, g) \
131 static int name##_enable(struct clk *clk) \
132 { \
133 __raw_writel(BM_CLKCTRL_##r##CTRL0_POWER, \
134 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \
135 udelay(10); \
136 \
137 if (clk == &pll2_clk) \
138 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
139 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \
140 else \
141 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
142 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \
143 \
144 return 0; \
145 }
146
147 _CLK_ENABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS)
148 _CLK_ENABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS)
149 _CLK_ENABLE_PLL(pll2_clk, PLL2, CLKGATE)
150
151 #define _CLK_DISABLE_PLL(name, r, g) \
152 static void name##_disable(struct clk *clk) \
153 { \
154 __raw_writel(BM_CLKCTRL_##r##CTRL0_POWER, \
155 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \
156 \
157 if (clk == &pll2_clk) \
158 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
159 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_SET); \
160 else \
161 __raw_writel(BM_CLKCTRL_##r##CTRL0_##g, \
162 CLKCTRL_BASE_ADDR + HW_CLKCTRL_##r##CTRL0_CLR); \
163 \
164 }
165
166 _CLK_DISABLE_PLL(pll0_clk, PLL0, EN_USB_CLKS)
167 _CLK_DISABLE_PLL(pll1_clk, PLL1, EN_USB_CLKS)
168 _CLK_DISABLE_PLL(pll2_clk, PLL2, CLKGATE)
169
170 #define _DEFINE_CLOCK_PLL(name) \
171 static struct clk name = { \
172 .get_rate = name##_get_rate, \
173 .enable = name##_enable, \
174 .disable = name##_disable, \
175 .parent = &ref_xtal_clk, \
176 }
177
178 _DEFINE_CLOCK_PLL(pll0_clk);
179 _DEFINE_CLOCK_PLL(pll1_clk);
180 _DEFINE_CLOCK_PLL(pll2_clk);
181
182 /*
183 * ref_clk
184 */
185 #define _CLK_GET_RATE_REF(name, sr, ss) \
186 static unsigned long name##_get_rate(struct clk *clk) \
187 { \
188 unsigned long parent_rate; \
189 u32 reg, div; \
190 \
191 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##sr); \
192 div = (reg >> BP_CLKCTRL_##sr##_##ss##FRAC) & 0x3f; \
193 parent_rate = clk_get_rate(clk->parent); \
194 \
195 return SH_DIV((parent_rate >> PARENT_RATE_SHIFT) * 18, \
196 div, PARENT_RATE_SHIFT); \
197 }
198
199 _CLK_GET_RATE_REF(ref_cpu_clk, FRAC0, CPU)
200 _CLK_GET_RATE_REF(ref_emi_clk, FRAC0, EMI)
201 _CLK_GET_RATE_REF(ref_io0_clk, FRAC0, IO0)
202 _CLK_GET_RATE_REF(ref_io1_clk, FRAC0, IO1)
203 _CLK_GET_RATE_REF(ref_pix_clk, FRAC1, PIX)
204 _CLK_GET_RATE_REF(ref_gpmi_clk, FRAC1, GPMI)
205
206 #define _DEFINE_CLOCK_REF(name, er, es) \
207 static struct clk name = { \
208 .enable_reg = CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er, \
209 .enable_shift = BP_CLKCTRL_##er##_CLKGATE##es, \
210 .get_rate = name##_get_rate, \
211 .enable = _raw_clk_enable, \
212 .disable = _raw_clk_disable, \
213 .parent = &pll0_clk, \
214 }
215
216 _DEFINE_CLOCK_REF(ref_cpu_clk, FRAC0, CPU);
217 _DEFINE_CLOCK_REF(ref_emi_clk, FRAC0, EMI);
218 _DEFINE_CLOCK_REF(ref_io0_clk, FRAC0, IO0);
219 _DEFINE_CLOCK_REF(ref_io1_clk, FRAC0, IO1);
220 _DEFINE_CLOCK_REF(ref_pix_clk, FRAC1, PIX);
221 _DEFINE_CLOCK_REF(ref_gpmi_clk, FRAC1, GPMI);
222
223 /*
224 * General clocks
225 *
226 * clk_get_rate
227 */
lradc_clk_get_rate(struct clk * clk)228 static unsigned long lradc_clk_get_rate(struct clk *clk)
229 {
230 return clk_get_rate(clk->parent) / 16;
231 }
232
rtc_clk_get_rate(struct clk * clk)233 static unsigned long rtc_clk_get_rate(struct clk *clk)
234 {
235 /* ref_xtal_clk is implemented as the only parent */
236 return clk_get_rate(clk->parent) / 768;
237 }
238
clk32k_clk_get_rate(struct clk * clk)239 static unsigned long clk32k_clk_get_rate(struct clk *clk)
240 {
241 return clk->parent->get_rate(clk->parent) / 750;
242 }
243
spdif_clk_get_rate(struct clk * clk)244 static unsigned long spdif_clk_get_rate(struct clk *clk)
245 {
246 return clk_get_rate(clk->parent) / 4;
247 }
248
249 #define _CLK_GET_RATE(name, rs) \
250 static unsigned long name##_get_rate(struct clk *clk) \
251 { \
252 u32 reg, div; \
253 \
254 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
255 \
256 if (clk->parent == &ref_xtal_clk) \
257 div = (reg & BM_CLKCTRL_##rs##_DIV_XTAL) >> \
258 BP_CLKCTRL_##rs##_DIV_XTAL; \
259 else \
260 div = (reg & BM_CLKCTRL_##rs##_DIV_##rs) >> \
261 BP_CLKCTRL_##rs##_DIV_##rs; \
262 \
263 if (!div) \
264 return -EINVAL; \
265 \
266 return clk_get_rate(clk->parent) / div; \
267 }
268
269 _CLK_GET_RATE(cpu_clk, CPU)
270 _CLK_GET_RATE(emi_clk, EMI)
271
272 #define _CLK_GET_RATE1(name, rs) \
273 static unsigned long name##_get_rate(struct clk *clk) \
274 { \
275 u32 reg, div; \
276 \
277 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
278 div = (reg & BM_CLKCTRL_##rs##_DIV) >> BP_CLKCTRL_##rs##_DIV; \
279 \
280 if (!div) \
281 return -EINVAL; \
282 \
283 if (clk == &saif0_clk || clk == &saif1_clk) \
284 return clk_get_rate(clk->parent) >> 16 * div; \
285 else \
286 return clk_get_rate(clk->parent) / div; \
287 }
288
289 _CLK_GET_RATE1(hbus_clk, HBUS)
290 _CLK_GET_RATE1(xbus_clk, XBUS)
291 _CLK_GET_RATE1(ssp0_clk, SSP0)
292 _CLK_GET_RATE1(ssp1_clk, SSP1)
293 _CLK_GET_RATE1(ssp2_clk, SSP2)
294 _CLK_GET_RATE1(ssp3_clk, SSP3)
295 _CLK_GET_RATE1(gpmi_clk, GPMI)
296 _CLK_GET_RATE1(lcdif_clk, DIS_LCDIF)
297 _CLK_GET_RATE1(saif0_clk, SAIF0)
298 _CLK_GET_RATE1(saif1_clk, SAIF1)
299
300 #define _CLK_GET_RATE_STUB(name) \
301 static unsigned long name##_get_rate(struct clk *clk) \
302 { \
303 return clk_get_rate(clk->parent); \
304 }
305
306 _CLK_GET_RATE_STUB(uart_clk)
307 _CLK_GET_RATE_STUB(pwm_clk)
308 _CLK_GET_RATE_STUB(can0_clk)
309 _CLK_GET_RATE_STUB(can1_clk)
310 _CLK_GET_RATE_STUB(fec_clk)
311
312 /*
313 * clk_set_rate
314 */
315 /* fool compiler */
316 #define BM_CLKCTRL_CPU_DIV 0
317 #define BP_CLKCTRL_CPU_DIV 0
318 #define BM_CLKCTRL_CPU_BUSY 0
319
320 #define _CLK_SET_RATE(name, dr, fr, fs) \
321 static int name##_set_rate(struct clk *clk, unsigned long rate) \
322 { \
323 u32 reg, bm_busy, div_max, d, f, div, frac; \
324 unsigned long diff, parent_rate, calc_rate; \
325 \
326 div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV; \
327 bm_busy = BM_CLKCTRL_##dr##_BUSY; \
328 \
329 if (clk->parent == &ref_xtal_clk) { \
330 parent_rate = clk_get_rate(clk->parent); \
331 div = DIV_ROUND_UP(parent_rate, rate); \
332 if (clk == &cpu_clk) { \
333 div_max = BM_CLKCTRL_CPU_DIV_XTAL >> \
334 BP_CLKCTRL_CPU_DIV_XTAL; \
335 bm_busy = BM_CLKCTRL_CPU_BUSY_REF_XTAL; \
336 } \
337 if (div == 0 || div > div_max) \
338 return -EINVAL; \
339 } else { \
340 /* \
341 * hack alert: this block modifies clk->parent, too, \
342 * so the base to use it the grand parent. \
343 */ \
344 parent_rate = clk_get_rate(clk->parent->parent); \
345 rate >>= PARENT_RATE_SHIFT; \
346 parent_rate >>= PARENT_RATE_SHIFT; \
347 diff = parent_rate; \
348 div = frac = 1; \
349 if (clk == &cpu_clk) { \
350 div_max = BM_CLKCTRL_CPU_DIV_CPU >> \
351 BP_CLKCTRL_CPU_DIV_CPU; \
352 bm_busy = BM_CLKCTRL_CPU_BUSY_REF_CPU; \
353 } \
354 for (d = 1; d <= div_max; d++) { \
355 f = parent_rate * 18 / d / rate; \
356 if ((parent_rate * 18 / d) % rate) \
357 f++; \
358 if (f < 18 || f > 35) \
359 continue; \
360 \
361 calc_rate = parent_rate * 18 / f / d; \
362 if (calc_rate > rate) \
363 continue; \
364 \
365 if (rate - calc_rate < diff) { \
366 frac = f; \
367 div = d; \
368 diff = rate - calc_rate; \
369 } \
370 \
371 if (diff == 0) \
372 break; \
373 } \
374 \
375 if (diff == parent_rate) \
376 return -EINVAL; \
377 \
378 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr); \
379 reg &= ~BM_CLKCTRL_##fr##_##fs##FRAC; \
380 reg |= frac << BP_CLKCTRL_##fr##_##fs##FRAC; \
381 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##fr); \
382 } \
383 \
384 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
385 if (clk == &cpu_clk) { \
386 reg &= ~BM_CLKCTRL_CPU_DIV_CPU; \
387 reg |= div << BP_CLKCTRL_CPU_DIV_CPU; \
388 } else { \
389 reg &= ~BM_CLKCTRL_##dr##_DIV; \
390 reg |= div << BP_CLKCTRL_##dr##_DIV; \
391 if (reg & (1 << clk->enable_shift)) { \
392 pr_err("%s: clock is gated\n", __func__); \
393 return -EINVAL; \
394 } \
395 } \
396 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
397 \
398 return mxs_clkctrl_timeout(HW_CLKCTRL_##dr, bm_busy); \
399 }
400
401 _CLK_SET_RATE(cpu_clk, CPU, FRAC0, CPU)
402 _CLK_SET_RATE(ssp0_clk, SSP0, FRAC0, IO0)
403 _CLK_SET_RATE(ssp1_clk, SSP1, FRAC0, IO0)
404 _CLK_SET_RATE(ssp2_clk, SSP2, FRAC0, IO1)
405 _CLK_SET_RATE(ssp3_clk, SSP3, FRAC0, IO1)
406 _CLK_SET_RATE(lcdif_clk, DIS_LCDIF, FRAC1, PIX)
407 _CLK_SET_RATE(gpmi_clk, GPMI, FRAC1, GPMI)
408
409 #define _CLK_SET_RATE1(name, dr) \
410 static int name##_set_rate(struct clk *clk, unsigned long rate) \
411 { \
412 u32 reg, div_max, div; \
413 unsigned long parent_rate; \
414 \
415 parent_rate = clk_get_rate(clk->parent); \
416 div_max = BM_CLKCTRL_##dr##_DIV >> BP_CLKCTRL_##dr##_DIV; \
417 \
418 div = DIV_ROUND_UP(parent_rate, rate); \
419 if (div == 0 || div > div_max) \
420 return -EINVAL; \
421 \
422 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
423 reg &= ~BM_CLKCTRL_##dr##_DIV; \
424 reg |= div << BP_CLKCTRL_##dr##_DIV; \
425 if (reg & (1 << clk->enable_shift)) { \
426 pr_err("%s: clock is gated\n", __func__); \
427 return -EINVAL; \
428 } \
429 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##dr); \
430 \
431 return mxs_clkctrl_timeout(HW_CLKCTRL_##dr, BM_CLKCTRL_##dr##_BUSY);\
432 }
433
434 _CLK_SET_RATE1(xbus_clk, XBUS)
435
436 /* saif clock uses 16 bits frac div */
437 #define _CLK_SET_RATE_SAIF(name, rs) \
438 static int name##_set_rate(struct clk *clk, unsigned long rate) \
439 { \
440 u16 div; \
441 u32 reg; \
442 u64 lrate; \
443 unsigned long parent_rate; \
444 \
445 parent_rate = clk_get_rate(clk->parent); \
446 if (rate > parent_rate) \
447 return -EINVAL; \
448 \
449 lrate = (u64)rate << 16; \
450 do_div(lrate, parent_rate); \
451 div = (u16)lrate; \
452 \
453 if (!div) \
454 return -EINVAL; \
455 \
456 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
457 reg &= ~BM_CLKCTRL_##rs##_DIV; \
458 reg |= div << BP_CLKCTRL_##rs##_DIV; \
459 if (reg & (1 << clk->enable_shift)) { \
460 pr_err("%s: clock is gated\n", __func__); \
461 return -EINVAL; \
462 } \
463 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_##rs); \
464 \
465 return mxs_clkctrl_timeout(HW_CLKCTRL_##rs, BM_CLKCTRL_##rs##_BUSY);\
466 }
467
468 _CLK_SET_RATE_SAIF(saif0_clk, SAIF0)
469 _CLK_SET_RATE_SAIF(saif1_clk, SAIF1)
470
471 #define _CLK_SET_RATE_STUB(name) \
472 static int name##_set_rate(struct clk *clk, unsigned long rate) \
473 { \
474 return -EINVAL; \
475 }
476
477 _CLK_SET_RATE_STUB(emi_clk)
478 _CLK_SET_RATE_STUB(uart_clk)
479 _CLK_SET_RATE_STUB(pwm_clk)
480 _CLK_SET_RATE_STUB(spdif_clk)
481 _CLK_SET_RATE_STUB(clk32k_clk)
482 _CLK_SET_RATE_STUB(can0_clk)
483 _CLK_SET_RATE_STUB(can1_clk)
484 _CLK_SET_RATE_STUB(fec_clk)
485
486 /*
487 * clk_set_parent
488 */
489 #define _CLK_SET_PARENT(name, bit) \
490 static int name##_set_parent(struct clk *clk, struct clk *parent) \
491 { \
492 if (parent != clk->parent) { \
493 __raw_writel(BM_CLKCTRL_CLKSEQ_BYPASS_##bit, \
494 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ_TOG); \
495 clk->parent = parent; \
496 } \
497 \
498 return 0; \
499 }
500
501 _CLK_SET_PARENT(cpu_clk, CPU)
502 _CLK_SET_PARENT(emi_clk, EMI)
503 _CLK_SET_PARENT(ssp0_clk, SSP0)
504 _CLK_SET_PARENT(ssp1_clk, SSP1)
505 _CLK_SET_PARENT(ssp2_clk, SSP2)
506 _CLK_SET_PARENT(ssp3_clk, SSP3)
507 _CLK_SET_PARENT(lcdif_clk, DIS_LCDIF)
508 _CLK_SET_PARENT(gpmi_clk, GPMI)
509 _CLK_SET_PARENT(saif0_clk, SAIF0)
510 _CLK_SET_PARENT(saif1_clk, SAIF1)
511
512 #define _CLK_SET_PARENT_STUB(name) \
513 static int name##_set_parent(struct clk *clk, struct clk *parent) \
514 { \
515 if (parent != clk->parent) \
516 return -EINVAL; \
517 else \
518 return 0; \
519 }
520
521 _CLK_SET_PARENT_STUB(pwm_clk)
522 _CLK_SET_PARENT_STUB(uart_clk)
523 _CLK_SET_PARENT_STUB(clk32k_clk)
524 _CLK_SET_PARENT_STUB(spdif_clk)
525 _CLK_SET_PARENT_STUB(fec_clk)
526 _CLK_SET_PARENT_STUB(can0_clk)
527 _CLK_SET_PARENT_STUB(can1_clk)
528
529 /*
530 * clk definition
531 */
532 static struct clk cpu_clk = {
533 .get_rate = cpu_clk_get_rate,
534 .set_rate = cpu_clk_set_rate,
535 .set_parent = cpu_clk_set_parent,
536 .parent = &ref_cpu_clk,
537 };
538
539 static struct clk hbus_clk = {
540 .get_rate = hbus_clk_get_rate,
541 .parent = &cpu_clk,
542 };
543
544 static struct clk xbus_clk = {
545 .get_rate = xbus_clk_get_rate,
546 .set_rate = xbus_clk_set_rate,
547 .parent = &ref_xtal_clk,
548 };
549
550 static struct clk lradc_clk = {
551 .get_rate = lradc_clk_get_rate,
552 .parent = &clk32k_clk,
553 };
554
555 static struct clk rtc_clk = {
556 .get_rate = rtc_clk_get_rate,
557 .parent = &ref_xtal_clk,
558 };
559
560 /* usb_clk gate is controlled in DIGCTRL other than CLKCTRL */
561 static struct clk usb0_clk = {
562 .enable_reg = DIGCTRL_BASE_ADDR,
563 .enable_shift = 2,
564 .enable = _raw_clk_enable,
565 .disable = _raw_clk_disable,
566 .parent = &pll0_clk,
567 };
568
569 static struct clk usb1_clk = {
570 .enable_reg = DIGCTRL_BASE_ADDR,
571 .enable_shift = 16,
572 .enable = _raw_clk_enable,
573 .disable = _raw_clk_disable,
574 .parent = &pll1_clk,
575 };
576
577 #define _DEFINE_CLOCK(name, er, es, p) \
578 static struct clk name = { \
579 .enable_reg = CLKCTRL_BASE_ADDR + HW_CLKCTRL_##er, \
580 .enable_shift = BP_CLKCTRL_##er##_##es, \
581 .get_rate = name##_get_rate, \
582 .set_rate = name##_set_rate, \
583 .set_parent = name##_set_parent, \
584 .enable = _raw_clk_enable, \
585 .disable = _raw_clk_disable, \
586 .parent = p, \
587 }
588
589 _DEFINE_CLOCK(emi_clk, EMI, CLKGATE, &ref_xtal_clk);
590 _DEFINE_CLOCK(ssp0_clk, SSP0, CLKGATE, &ref_xtal_clk);
591 _DEFINE_CLOCK(ssp1_clk, SSP1, CLKGATE, &ref_xtal_clk);
592 _DEFINE_CLOCK(ssp2_clk, SSP2, CLKGATE, &ref_xtal_clk);
593 _DEFINE_CLOCK(ssp3_clk, SSP3, CLKGATE, &ref_xtal_clk);
594 _DEFINE_CLOCK(lcdif_clk, DIS_LCDIF, CLKGATE, &ref_xtal_clk);
595 _DEFINE_CLOCK(gpmi_clk, GPMI, CLKGATE, &ref_xtal_clk);
596 _DEFINE_CLOCK(saif0_clk, SAIF0, CLKGATE, &ref_xtal_clk);
597 _DEFINE_CLOCK(saif1_clk, SAIF1, CLKGATE, &ref_xtal_clk);
598 _DEFINE_CLOCK(can0_clk, FLEXCAN, STOP_CAN0, &ref_xtal_clk);
599 _DEFINE_CLOCK(can1_clk, FLEXCAN, STOP_CAN1, &ref_xtal_clk);
600 _DEFINE_CLOCK(pwm_clk, XTAL, PWM_CLK24M_GATE, &ref_xtal_clk);
601 _DEFINE_CLOCK(uart_clk, XTAL, UART_CLK_GATE, &ref_xtal_clk);
602 _DEFINE_CLOCK(clk32k_clk, XTAL, TIMROT_CLK32K_GATE, &ref_xtal_clk);
603 _DEFINE_CLOCK(spdif_clk, SPDIF, CLKGATE, &pll0_clk);
604 _DEFINE_CLOCK(fec_clk, ENET, DISABLE, &hbus_clk);
605
606 #define _REGISTER_CLOCK(d, n, c) \
607 { \
608 .dev_id = d, \
609 .con_id = n, \
610 .clk = &c, \
611 },
612
613 static struct clk_lookup lookups[] = {
614 /* for amba bus driver */
615 _REGISTER_CLOCK("duart", "apb_pclk", xbus_clk)
616 /* for amba-pl011 driver */
617 _REGISTER_CLOCK("duart", NULL, uart_clk)
618 _REGISTER_CLOCK("imx28-fec.0", NULL, fec_clk)
619 _REGISTER_CLOCK("imx28-fec.1", NULL, fec_clk)
620 _REGISTER_CLOCK("imx28-gpmi-nand", NULL, gpmi_clk)
621 _REGISTER_CLOCK("mxs-auart.0", NULL, uart_clk)
622 _REGISTER_CLOCK("mxs-auart.1", NULL, uart_clk)
623 _REGISTER_CLOCK("mxs-auart.2", NULL, uart_clk)
624 _REGISTER_CLOCK("mxs-auart.3", NULL, uart_clk)
625 _REGISTER_CLOCK("mxs-auart.4", NULL, uart_clk)
626 _REGISTER_CLOCK("rtc", NULL, rtc_clk)
627 _REGISTER_CLOCK("pll2", NULL, pll2_clk)
628 _REGISTER_CLOCK("mxs-dma-apbh", NULL, hbus_clk)
629 _REGISTER_CLOCK("mxs-dma-apbx", NULL, xbus_clk)
630 _REGISTER_CLOCK("mxs-mmc.0", NULL, ssp0_clk)
631 _REGISTER_CLOCK("mxs-mmc.1", NULL, ssp1_clk)
632 _REGISTER_CLOCK("mxs-mmc.2", NULL, ssp2_clk)
633 _REGISTER_CLOCK("mxs-mmc.3", NULL, ssp3_clk)
634 _REGISTER_CLOCK("flexcan.0", NULL, can0_clk)
635 _REGISTER_CLOCK("flexcan.1", NULL, can1_clk)
636 _REGISTER_CLOCK(NULL, "usb0", usb0_clk)
637 _REGISTER_CLOCK(NULL, "usb1", usb1_clk)
638 _REGISTER_CLOCK("mxs-pwm.0", NULL, pwm_clk)
639 _REGISTER_CLOCK("mxs-pwm.1", NULL, pwm_clk)
640 _REGISTER_CLOCK("mxs-pwm.2", NULL, pwm_clk)
641 _REGISTER_CLOCK("mxs-pwm.3", NULL, pwm_clk)
642 _REGISTER_CLOCK("mxs-pwm.4", NULL, pwm_clk)
643 _REGISTER_CLOCK("mxs-pwm.5", NULL, pwm_clk)
644 _REGISTER_CLOCK("mxs-pwm.6", NULL, pwm_clk)
645 _REGISTER_CLOCK("mxs-pwm.7", NULL, pwm_clk)
646 _REGISTER_CLOCK(NULL, "lradc", lradc_clk)
647 _REGISTER_CLOCK(NULL, "spdif", spdif_clk)
648 _REGISTER_CLOCK("imx28-fb", NULL, lcdif_clk)
649 _REGISTER_CLOCK("mxs-saif.0", NULL, saif0_clk)
650 _REGISTER_CLOCK("mxs-saif.1", NULL, saif1_clk)
651 };
652
clk_misc_init(void)653 static int clk_misc_init(void)
654 {
655 u32 reg;
656 int ret;
657
658 /* Fix up parent per register setting */
659 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_CLKSEQ);
660 cpu_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_CPU) ?
661 &ref_xtal_clk : &ref_cpu_clk;
662 emi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_EMI) ?
663 &ref_xtal_clk : &ref_emi_clk;
664 ssp0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP0) ?
665 &ref_xtal_clk : &ref_io0_clk;
666 ssp1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP1) ?
667 &ref_xtal_clk : &ref_io0_clk;
668 ssp2_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP2) ?
669 &ref_xtal_clk : &ref_io1_clk;
670 ssp3_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SSP3) ?
671 &ref_xtal_clk : &ref_io1_clk;
672 lcdif_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_DIS_LCDIF) ?
673 &ref_xtal_clk : &ref_pix_clk;
674 gpmi_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_GPMI) ?
675 &ref_xtal_clk : &ref_gpmi_clk;
676 saif0_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF0) ?
677 &ref_xtal_clk : &pll0_clk;
678 saif1_clk.parent = (reg & BM_CLKCTRL_CLKSEQ_BYPASS_SAIF1) ?
679 &ref_xtal_clk : &pll0_clk;
680
681 /* Use int div over frac when both are available */
682 __raw_writel(BM_CLKCTRL_CPU_DIV_XTAL_FRAC_EN,
683 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR);
684 __raw_writel(BM_CLKCTRL_CPU_DIV_CPU_FRAC_EN,
685 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_CLR);
686 __raw_writel(BM_CLKCTRL_HBUS_DIV_FRAC_EN,
687 CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS_CLR);
688
689 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS);
690 reg &= ~BM_CLKCTRL_XBUS_DIV_FRAC_EN;
691 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_XBUS);
692
693 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0);
694 reg &= ~BM_CLKCTRL_SSP0_DIV_FRAC_EN;
695 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP0);
696
697 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1);
698 reg &= ~BM_CLKCTRL_SSP1_DIV_FRAC_EN;
699 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP1);
700
701 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2);
702 reg &= ~BM_CLKCTRL_SSP2_DIV_FRAC_EN;
703 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP2);
704
705 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3);
706 reg &= ~BM_CLKCTRL_SSP3_DIV_FRAC_EN;
707 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SSP3);
708
709 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI);
710 reg &= ~BM_CLKCTRL_GPMI_DIV_FRAC_EN;
711 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_GPMI);
712
713 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF);
714 reg &= ~BM_CLKCTRL_DIS_LCDIF_DIV_FRAC_EN;
715 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_DIS_LCDIF);
716
717 /* SAIF has to use frac div for functional operation */
718 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0);
719 reg |= BM_CLKCTRL_SAIF0_DIV_FRAC_EN;
720 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF0);
721
722 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1);
723 reg |= BM_CLKCTRL_SAIF1_DIV_FRAC_EN;
724 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_SAIF1);
725
726 /*
727 * Set safe hbus clock divider. A divider of 3 ensure that
728 * the Vddd voltage required for the cpu clock is sufficiently
729 * high for the hbus clock.
730 */
731 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS);
732 reg &= BM_CLKCTRL_HBUS_DIV;
733 reg |= 3 << BP_CLKCTRL_HBUS_DIV;
734 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS);
735
736 ret = mxs_clkctrl_timeout(HW_CLKCTRL_HBUS, BM_CLKCTRL_HBUS_ASM_BUSY);
737
738 /* Gate off cpu clock in WFI for power saving */
739 __raw_writel(BM_CLKCTRL_CPU_INTERRUPT_WAIT,
740 CLKCTRL_BASE_ADDR + HW_CLKCTRL_CPU_SET);
741
742 /*
743 * Extra fec clock setting
744 * The DENX M28 uses an external clock source
745 * and the clock output must not be enabled
746 */
747 if (!machine_is_m28evk()) {
748 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
749 reg &= ~BM_CLKCTRL_ENET_SLEEP;
750 reg |= BM_CLKCTRL_ENET_CLK_OUT_EN;
751 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_ENET);
752 }
753
754 /*
755 * 480 MHz seems too high to be ssp clock source directly,
756 * so set frac0 to get a 288 MHz ref_io0.
757 */
758 reg = __raw_readl(CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC0);
759 reg &= ~BM_CLKCTRL_FRAC0_IO0FRAC;
760 reg |= 30 << BP_CLKCTRL_FRAC0_IO0FRAC;
761 __raw_writel(reg, CLKCTRL_BASE_ADDR + HW_CLKCTRL_FRAC0);
762
763 return ret;
764 }
765
mx28_clocks_init(void)766 int __init mx28_clocks_init(void)
767 {
768 clk_misc_init();
769
770 /*
771 * source ssp clock from ref_io0 than ref_xtal,
772 * as ref_xtal only provides 24 MHz as maximum.
773 */
774 clk_set_parent(&ssp0_clk, &ref_io0_clk);
775 clk_set_parent(&ssp1_clk, &ref_io0_clk);
776 clk_set_parent(&ssp2_clk, &ref_io1_clk);
777 clk_set_parent(&ssp3_clk, &ref_io1_clk);
778
779 clk_prepare_enable(&cpu_clk);
780 clk_prepare_enable(&hbus_clk);
781 clk_prepare_enable(&xbus_clk);
782 clk_prepare_enable(&emi_clk);
783 clk_prepare_enable(&uart_clk);
784
785 clk_set_parent(&lcdif_clk, &ref_pix_clk);
786 clk_set_parent(&saif0_clk, &pll0_clk);
787 clk_set_parent(&saif1_clk, &pll0_clk);
788
789 /*
790 * Set an initial clock rate for the saif internal logic to work
791 * properly. This is important when working in EXTMASTER mode that
792 * uses the other saif's BITCLK&LRCLK but it still needs a basic
793 * clock which should be fast enough for the internal logic.
794 */
795 clk_set_rate(&saif0_clk, 24000000);
796 clk_set_rate(&saif1_clk, 24000000);
797
798 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
799
800 mxs_timer_init(&clk32k_clk, MX28_INT_TIMER0);
801
802 return 0;
803 }
804