1 /*
2 * Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
3 * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de>
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
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
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
17 * MA 02110-1301, USA.
18 */
19
20 #include <linux/module.h>
21 #include <linux/spinlock.h>
22 #include <linux/delay.h>
23 #include <linux/clk.h>
24 #include <linux/err.h>
25 #include <linux/io.h>
26 #include <linux/clkdev.h>
27
28 #include <asm/div64.h>
29
30 #include <mach/clock.h>
31 #include <mach/hardware.h>
32 #include <mach/mx31.h>
33 #include <mach/common.h>
34
35 #include "crmregs-imx3.h"
36
37 #define PRE_DIV_MIN_FREQ 10000000 /* Minimum Frequency after Predivider */
38
__calc_pre_post_dividers(u32 div,u32 * pre,u32 * post)39 static void __calc_pre_post_dividers(u32 div, u32 *pre, u32 *post)
40 {
41 u32 min_pre, temp_pre, old_err, err;
42
43 if (div >= 512) {
44 *pre = 8;
45 *post = 64;
46 } else if (div >= 64) {
47 min_pre = (div - 1) / 64 + 1;
48 old_err = 8;
49 for (temp_pre = 8; temp_pre >= min_pre; temp_pre--) {
50 err = div % temp_pre;
51 if (err == 0) {
52 *pre = temp_pre;
53 break;
54 }
55 err = temp_pre - err;
56 if (err < old_err) {
57 old_err = err;
58 *pre = temp_pre;
59 }
60 }
61 *post = (div + *pre - 1) / *pre;
62 } else if (div <= 8) {
63 *pre = div;
64 *post = 1;
65 } else {
66 *pre = 1;
67 *post = div;
68 }
69 }
70
71 static struct clk mcu_pll_clk;
72 static struct clk serial_pll_clk;
73 static struct clk ipg_clk;
74 static struct clk ckih_clk;
75
cgr_enable(struct clk * clk)76 static int cgr_enable(struct clk *clk)
77 {
78 u32 reg;
79
80 if (!clk->enable_reg)
81 return 0;
82
83 reg = __raw_readl(clk->enable_reg);
84 reg |= 3 << clk->enable_shift;
85 __raw_writel(reg, clk->enable_reg);
86
87 return 0;
88 }
89
cgr_disable(struct clk * clk)90 static void cgr_disable(struct clk *clk)
91 {
92 u32 reg;
93
94 if (!clk->enable_reg)
95 return;
96
97 reg = __raw_readl(clk->enable_reg);
98 reg &= ~(3 << clk->enable_shift);
99
100 /* special case for EMI clock */
101 if (clk->enable_reg == MXC_CCM_CGR2 && clk->enable_shift == 8)
102 reg |= (1 << clk->enable_shift);
103
104 __raw_writel(reg, clk->enable_reg);
105 }
106
pll_ref_get_rate(void)107 static unsigned long pll_ref_get_rate(void)
108 {
109 unsigned long ccmr;
110 unsigned int prcs;
111
112 ccmr = __raw_readl(MXC_CCM_CCMR);
113 prcs = (ccmr & MXC_CCM_CCMR_PRCS_MASK) >> MXC_CCM_CCMR_PRCS_OFFSET;
114 if (prcs == 0x1)
115 return CKIL_CLK_FREQ * 1024;
116 else
117 return clk_get_rate(&ckih_clk);
118 }
119
usb_pll_get_rate(struct clk * clk)120 static unsigned long usb_pll_get_rate(struct clk *clk)
121 {
122 unsigned long reg;
123
124 reg = __raw_readl(MXC_CCM_UPCTL);
125
126 return mxc_decode_pll(reg, pll_ref_get_rate());
127 }
128
serial_pll_get_rate(struct clk * clk)129 static unsigned long serial_pll_get_rate(struct clk *clk)
130 {
131 unsigned long reg;
132
133 reg = __raw_readl(MXC_CCM_SRPCTL);
134
135 return mxc_decode_pll(reg, pll_ref_get_rate());
136 }
137
mcu_pll_get_rate(struct clk * clk)138 static unsigned long mcu_pll_get_rate(struct clk *clk)
139 {
140 unsigned long reg, ccmr;
141
142 ccmr = __raw_readl(MXC_CCM_CCMR);
143
144 if (!(ccmr & MXC_CCM_CCMR_MPE) || (ccmr & MXC_CCM_CCMR_MDS))
145 return clk_get_rate(&ckih_clk);
146
147 reg = __raw_readl(MXC_CCM_MPCTL);
148
149 return mxc_decode_pll(reg, pll_ref_get_rate());
150 }
151
usb_pll_enable(struct clk * clk)152 static int usb_pll_enable(struct clk *clk)
153 {
154 u32 reg;
155
156 reg = __raw_readl(MXC_CCM_CCMR);
157 reg |= MXC_CCM_CCMR_UPE;
158 __raw_writel(reg, MXC_CCM_CCMR);
159
160 /* No lock bit on MX31, so using max time from spec */
161 udelay(80);
162
163 return 0;
164 }
165
usb_pll_disable(struct clk * clk)166 static void usb_pll_disable(struct clk *clk)
167 {
168 u32 reg;
169
170 reg = __raw_readl(MXC_CCM_CCMR);
171 reg &= ~MXC_CCM_CCMR_UPE;
172 __raw_writel(reg, MXC_CCM_CCMR);
173 }
174
serial_pll_enable(struct clk * clk)175 static int serial_pll_enable(struct clk *clk)
176 {
177 u32 reg;
178
179 reg = __raw_readl(MXC_CCM_CCMR);
180 reg |= MXC_CCM_CCMR_SPE;
181 __raw_writel(reg, MXC_CCM_CCMR);
182
183 /* No lock bit on MX31, so using max time from spec */
184 udelay(80);
185
186 return 0;
187 }
188
serial_pll_disable(struct clk * clk)189 static void serial_pll_disable(struct clk *clk)
190 {
191 u32 reg;
192
193 reg = __raw_readl(MXC_CCM_CCMR);
194 reg &= ~MXC_CCM_CCMR_SPE;
195 __raw_writel(reg, MXC_CCM_CCMR);
196 }
197
198 #define PDR0(mask, off) ((__raw_readl(MXC_CCM_PDR0) & mask) >> off)
199 #define PDR1(mask, off) ((__raw_readl(MXC_CCM_PDR1) & mask) >> off)
200 #define PDR2(mask, off) ((__raw_readl(MXC_CCM_PDR2) & mask) >> off)
201
mcu_main_get_rate(struct clk * clk)202 static unsigned long mcu_main_get_rate(struct clk *clk)
203 {
204 u32 pmcr0 = __raw_readl(MXC_CCM_PMCR0);
205
206 if ((pmcr0 & MXC_CCM_PMCR0_DFSUP1) == MXC_CCM_PMCR0_DFSUP1_SPLL)
207 return clk_get_rate(&serial_pll_clk);
208 else
209 return clk_get_rate(&mcu_pll_clk);
210 }
211
ahb_get_rate(struct clk * clk)212 static unsigned long ahb_get_rate(struct clk *clk)
213 {
214 unsigned long max_pdf;
215
216 max_pdf = PDR0(MXC_CCM_PDR0_MAX_PODF_MASK,
217 MXC_CCM_PDR0_MAX_PODF_OFFSET);
218 return clk_get_rate(clk->parent) / (max_pdf + 1);
219 }
220
ipg_get_rate(struct clk * clk)221 static unsigned long ipg_get_rate(struct clk *clk)
222 {
223 unsigned long ipg_pdf;
224
225 ipg_pdf = PDR0(MXC_CCM_PDR0_IPG_PODF_MASK,
226 MXC_CCM_PDR0_IPG_PODF_OFFSET);
227 return clk_get_rate(clk->parent) / (ipg_pdf + 1);
228 }
229
nfc_get_rate(struct clk * clk)230 static unsigned long nfc_get_rate(struct clk *clk)
231 {
232 unsigned long nfc_pdf;
233
234 nfc_pdf = PDR0(MXC_CCM_PDR0_NFC_PODF_MASK,
235 MXC_CCM_PDR0_NFC_PODF_OFFSET);
236 return clk_get_rate(clk->parent) / (nfc_pdf + 1);
237 }
238
hsp_get_rate(struct clk * clk)239 static unsigned long hsp_get_rate(struct clk *clk)
240 {
241 unsigned long hsp_pdf;
242
243 hsp_pdf = PDR0(MXC_CCM_PDR0_HSP_PODF_MASK,
244 MXC_CCM_PDR0_HSP_PODF_OFFSET);
245 return clk_get_rate(clk->parent) / (hsp_pdf + 1);
246 }
247
usb_get_rate(struct clk * clk)248 static unsigned long usb_get_rate(struct clk *clk)
249 {
250 unsigned long usb_pdf, usb_prepdf;
251
252 usb_pdf = PDR1(MXC_CCM_PDR1_USB_PODF_MASK,
253 MXC_CCM_PDR1_USB_PODF_OFFSET);
254 usb_prepdf = PDR1(MXC_CCM_PDR1_USB_PRDF_MASK,
255 MXC_CCM_PDR1_USB_PRDF_OFFSET);
256 return clk_get_rate(clk->parent) / (usb_prepdf + 1) / (usb_pdf + 1);
257 }
258
csi_get_rate(struct clk * clk)259 static unsigned long csi_get_rate(struct clk *clk)
260 {
261 u32 reg, pre, post;
262
263 reg = __raw_readl(MXC_CCM_PDR0);
264 pre = (reg & MXC_CCM_PDR0_CSI_PRDF_MASK) >>
265 MXC_CCM_PDR0_CSI_PRDF_OFFSET;
266 pre++;
267 post = (reg & MXC_CCM_PDR0_CSI_PODF_MASK) >>
268 MXC_CCM_PDR0_CSI_PODF_OFFSET;
269 post++;
270 return clk_get_rate(clk->parent) / (pre * post);
271 }
272
csi_round_rate(struct clk * clk,unsigned long rate)273 static unsigned long csi_round_rate(struct clk *clk, unsigned long rate)
274 {
275 u32 pre, post, parent = clk_get_rate(clk->parent);
276 u32 div = parent / rate;
277
278 if (parent % rate)
279 div++;
280
281 __calc_pre_post_dividers(div, &pre, &post);
282
283 return parent / (pre * post);
284 }
285
csi_set_rate(struct clk * clk,unsigned long rate)286 static int csi_set_rate(struct clk *clk, unsigned long rate)
287 {
288 u32 reg, div, pre, post, parent = clk_get_rate(clk->parent);
289
290 div = parent / rate;
291
292 if ((parent / div) != rate)
293 return -EINVAL;
294
295 __calc_pre_post_dividers(div, &pre, &post);
296
297 /* Set CSI clock divider */
298 reg = __raw_readl(MXC_CCM_PDR0) &
299 ~(MXC_CCM_PDR0_CSI_PODF_MASK | MXC_CCM_PDR0_CSI_PRDF_MASK);
300 reg |= (post - 1) << MXC_CCM_PDR0_CSI_PODF_OFFSET;
301 reg |= (pre - 1) << MXC_CCM_PDR0_CSI_PRDF_OFFSET;
302 __raw_writel(reg, MXC_CCM_PDR0);
303
304 return 0;
305 }
306
ssi1_get_rate(struct clk * clk)307 static unsigned long ssi1_get_rate(struct clk *clk)
308 {
309 unsigned long ssi1_pdf, ssi1_prepdf;
310
311 ssi1_pdf = PDR1(MXC_CCM_PDR1_SSI1_PODF_MASK,
312 MXC_CCM_PDR1_SSI1_PODF_OFFSET);
313 ssi1_prepdf = PDR1(MXC_CCM_PDR1_SSI1_PRE_PODF_MASK,
314 MXC_CCM_PDR1_SSI1_PRE_PODF_OFFSET);
315 return clk_get_rate(clk->parent) / (ssi1_prepdf + 1) / (ssi1_pdf + 1);
316 }
317
ssi2_get_rate(struct clk * clk)318 static unsigned long ssi2_get_rate(struct clk *clk)
319 {
320 unsigned long ssi2_pdf, ssi2_prepdf;
321
322 ssi2_pdf = PDR1(MXC_CCM_PDR1_SSI2_PODF_MASK,
323 MXC_CCM_PDR1_SSI2_PODF_OFFSET);
324 ssi2_prepdf = PDR1(MXC_CCM_PDR1_SSI2_PRE_PODF_MASK,
325 MXC_CCM_PDR1_SSI2_PRE_PODF_OFFSET);
326 return clk_get_rate(clk->parent) / (ssi2_prepdf + 1) / (ssi2_pdf + 1);
327 }
328
firi_get_rate(struct clk * clk)329 static unsigned long firi_get_rate(struct clk *clk)
330 {
331 unsigned long firi_pdf, firi_prepdf;
332
333 firi_pdf = PDR1(MXC_CCM_PDR1_FIRI_PODF_MASK,
334 MXC_CCM_PDR1_FIRI_PODF_OFFSET);
335 firi_prepdf = PDR1(MXC_CCM_PDR1_FIRI_PRE_PODF_MASK,
336 MXC_CCM_PDR1_FIRI_PRE_PODF_OFFSET);
337 return clk_get_rate(clk->parent) / (firi_prepdf + 1) / (firi_pdf + 1);
338 }
339
firi_round_rate(struct clk * clk,unsigned long rate)340 static unsigned long firi_round_rate(struct clk *clk, unsigned long rate)
341 {
342 u32 pre, post;
343 u32 parent = clk_get_rate(clk->parent);
344 u32 div = parent / rate;
345
346 if (parent % rate)
347 div++;
348
349 __calc_pre_post_dividers(div, &pre, &post);
350
351 return parent / (pre * post);
352
353 }
354
firi_set_rate(struct clk * clk,unsigned long rate)355 static int firi_set_rate(struct clk *clk, unsigned long rate)
356 {
357 u32 reg, div, pre, post, parent = clk_get_rate(clk->parent);
358
359 div = parent / rate;
360
361 if ((parent / div) != rate)
362 return -EINVAL;
363
364 __calc_pre_post_dividers(div, &pre, &post);
365
366 /* Set FIRI clock divider */
367 reg = __raw_readl(MXC_CCM_PDR1) &
368 ~(MXC_CCM_PDR1_FIRI_PODF_MASK | MXC_CCM_PDR1_FIRI_PRE_PODF_MASK);
369 reg |= (pre - 1) << MXC_CCM_PDR1_FIRI_PRE_PODF_OFFSET;
370 reg |= (post - 1) << MXC_CCM_PDR1_FIRI_PODF_OFFSET;
371 __raw_writel(reg, MXC_CCM_PDR1);
372
373 return 0;
374 }
375
mbx_get_rate(struct clk * clk)376 static unsigned long mbx_get_rate(struct clk *clk)
377 {
378 return clk_get_rate(clk->parent) / 2;
379 }
380
mstick1_get_rate(struct clk * clk)381 static unsigned long mstick1_get_rate(struct clk *clk)
382 {
383 unsigned long msti_pdf;
384
385 msti_pdf = PDR2(MXC_CCM_PDR2_MST1_PDF_MASK,
386 MXC_CCM_PDR2_MST1_PDF_OFFSET);
387 return clk_get_rate(clk->parent) / (msti_pdf + 1);
388 }
389
mstick2_get_rate(struct clk * clk)390 static unsigned long mstick2_get_rate(struct clk *clk)
391 {
392 unsigned long msti_pdf;
393
394 msti_pdf = PDR2(MXC_CCM_PDR2_MST2_PDF_MASK,
395 MXC_CCM_PDR2_MST2_PDF_OFFSET);
396 return clk_get_rate(clk->parent) / (msti_pdf + 1);
397 }
398
399 static unsigned long ckih_rate;
400
clk_ckih_get_rate(struct clk * clk)401 static unsigned long clk_ckih_get_rate(struct clk *clk)
402 {
403 return ckih_rate;
404 }
405
clk_ckil_get_rate(struct clk * clk)406 static unsigned long clk_ckil_get_rate(struct clk *clk)
407 {
408 return CKIL_CLK_FREQ;
409 }
410
411 static struct clk ckih_clk = {
412 .get_rate = clk_ckih_get_rate,
413 };
414
415 static struct clk mcu_pll_clk = {
416 .parent = &ckih_clk,
417 .get_rate = mcu_pll_get_rate,
418 };
419
420 static struct clk mcu_main_clk = {
421 .parent = &mcu_pll_clk,
422 .get_rate = mcu_main_get_rate,
423 };
424
425 static struct clk serial_pll_clk = {
426 .parent = &ckih_clk,
427 .get_rate = serial_pll_get_rate,
428 .enable = serial_pll_enable,
429 .disable = serial_pll_disable,
430 };
431
432 static struct clk usb_pll_clk = {
433 .parent = &ckih_clk,
434 .get_rate = usb_pll_get_rate,
435 .enable = usb_pll_enable,
436 .disable = usb_pll_disable,
437 };
438
439 static struct clk ahb_clk = {
440 .parent = &mcu_main_clk,
441 .get_rate = ahb_get_rate,
442 };
443
444 #define DEFINE_CLOCK(name, i, er, es, gr, s, p) \
445 static struct clk name = { \
446 .id = i, \
447 .enable_reg = er, \
448 .enable_shift = es, \
449 .get_rate = gr, \
450 .enable = cgr_enable, \
451 .disable = cgr_disable, \
452 .secondary = s, \
453 .parent = p, \
454 }
455
456 #define DEFINE_CLOCK1(name, i, er, es, getsetround, s, p) \
457 static struct clk name = { \
458 .id = i, \
459 .enable_reg = er, \
460 .enable_shift = es, \
461 .get_rate = getsetround##_get_rate, \
462 .set_rate = getsetround##_set_rate, \
463 .round_rate = getsetround##_round_rate, \
464 .enable = cgr_enable, \
465 .disable = cgr_disable, \
466 .secondary = s, \
467 .parent = p, \
468 }
469
470 DEFINE_CLOCK(perclk_clk, 0, NULL, 0, NULL, NULL, &ipg_clk);
471 DEFINE_CLOCK(ckil_clk, 0, NULL, 0, clk_ckil_get_rate, NULL, NULL);
472
473 DEFINE_CLOCK(sdhc1_clk, 0, MXC_CCM_CGR0, 0, NULL, NULL, &perclk_clk);
474 DEFINE_CLOCK(sdhc2_clk, 1, MXC_CCM_CGR0, 2, NULL, NULL, &perclk_clk);
475 DEFINE_CLOCK(gpt_clk, 0, MXC_CCM_CGR0, 4, NULL, NULL, &perclk_clk);
476 DEFINE_CLOCK(epit1_clk, 0, MXC_CCM_CGR0, 6, NULL, NULL, &perclk_clk);
477 DEFINE_CLOCK(epit2_clk, 1, MXC_CCM_CGR0, 8, NULL, NULL, &perclk_clk);
478 DEFINE_CLOCK(iim_clk, 0, MXC_CCM_CGR0, 10, NULL, NULL, &ipg_clk);
479 DEFINE_CLOCK(pata_clk, 0, MXC_CCM_CGR0, 12, NULL, NULL, &ipg_clk);
480 DEFINE_CLOCK(sdma_clk1, 0, MXC_CCM_CGR0, 14, NULL, NULL, &ahb_clk);
481 DEFINE_CLOCK(cspi3_clk, 2, MXC_CCM_CGR0, 16, NULL, NULL, &ipg_clk);
482 DEFINE_CLOCK(rng_clk, 0, MXC_CCM_CGR0, 18, NULL, NULL, &ipg_clk);
483 DEFINE_CLOCK(uart1_clk, 0, MXC_CCM_CGR0, 20, NULL, NULL, &perclk_clk);
484 DEFINE_CLOCK(uart2_clk, 1, MXC_CCM_CGR0, 22, NULL, NULL, &perclk_clk);
485 DEFINE_CLOCK(ssi1_clk, 0, MXC_CCM_CGR0, 24, ssi1_get_rate, NULL, &serial_pll_clk);
486 DEFINE_CLOCK(i2c1_clk, 0, MXC_CCM_CGR0, 26, NULL, NULL, &perclk_clk);
487 DEFINE_CLOCK(i2c2_clk, 1, MXC_CCM_CGR0, 28, NULL, NULL, &perclk_clk);
488 DEFINE_CLOCK(i2c3_clk, 2, MXC_CCM_CGR0, 30, NULL, NULL, &perclk_clk);
489
490 DEFINE_CLOCK(mpeg4_clk, 0, MXC_CCM_CGR1, 0, NULL, NULL, &ahb_clk);
491 DEFINE_CLOCK(mstick1_clk, 0, MXC_CCM_CGR1, 2, mstick1_get_rate, NULL, &usb_pll_clk);
492 DEFINE_CLOCK(mstick2_clk, 1, MXC_CCM_CGR1, 4, mstick2_get_rate, NULL, &usb_pll_clk);
493 DEFINE_CLOCK1(csi_clk, 0, MXC_CCM_CGR1, 6, csi, NULL, &serial_pll_clk);
494 DEFINE_CLOCK(rtc_clk, 0, MXC_CCM_CGR1, 8, NULL, NULL, &ckil_clk);
495 DEFINE_CLOCK(wdog_clk, 0, MXC_CCM_CGR1, 10, NULL, NULL, &ipg_clk);
496 DEFINE_CLOCK(pwm_clk, 0, MXC_CCM_CGR1, 12, NULL, NULL, &perclk_clk);
497 DEFINE_CLOCK(usb_clk2, 0, MXC_CCM_CGR1, 18, usb_get_rate, NULL, &ahb_clk);
498 DEFINE_CLOCK(kpp_clk, 0, MXC_CCM_CGR1, 20, NULL, NULL, &ipg_clk);
499 DEFINE_CLOCK(ipu_clk, 0, MXC_CCM_CGR1, 22, hsp_get_rate, NULL, &mcu_main_clk);
500 DEFINE_CLOCK(uart3_clk, 2, MXC_CCM_CGR1, 24, NULL, NULL, &perclk_clk);
501 DEFINE_CLOCK(uart4_clk, 3, MXC_CCM_CGR1, 26, NULL, NULL, &perclk_clk);
502 DEFINE_CLOCK(uart5_clk, 4, MXC_CCM_CGR1, 28, NULL, NULL, &perclk_clk);
503 DEFINE_CLOCK(owire_clk, 0, MXC_CCM_CGR1, 30, NULL, NULL, &perclk_clk);
504
505 DEFINE_CLOCK(ssi2_clk, 1, MXC_CCM_CGR2, 0, ssi2_get_rate, NULL, &serial_pll_clk);
506 DEFINE_CLOCK(cspi1_clk, 0, MXC_CCM_CGR2, 2, NULL, NULL, &ipg_clk);
507 DEFINE_CLOCK(cspi2_clk, 1, MXC_CCM_CGR2, 4, NULL, NULL, &ipg_clk);
508 DEFINE_CLOCK(mbx_clk, 0, MXC_CCM_CGR2, 6, mbx_get_rate, NULL, &ahb_clk);
509 DEFINE_CLOCK(emi_clk, 0, MXC_CCM_CGR2, 8, NULL, NULL, &ahb_clk);
510 DEFINE_CLOCK(rtic_clk, 0, MXC_CCM_CGR2, 10, NULL, NULL, &ahb_clk);
511 DEFINE_CLOCK1(firi_clk, 0, MXC_CCM_CGR2, 12, firi, NULL, &usb_pll_clk);
512
513 DEFINE_CLOCK(sdma_clk2, 0, NULL, 0, NULL, NULL, &ipg_clk);
514 DEFINE_CLOCK(usb_clk1, 0, NULL, 0, usb_get_rate, NULL, &usb_pll_clk);
515 DEFINE_CLOCK(nfc_clk, 0, NULL, 0, nfc_get_rate, NULL, &ahb_clk);
516 DEFINE_CLOCK(scc_clk, 0, NULL, 0, NULL, NULL, &ipg_clk);
517 DEFINE_CLOCK(ipg_clk, 0, NULL, 0, ipg_get_rate, NULL, &ahb_clk);
518
519 #define _REGISTER_CLOCK(d, n, c) \
520 { \
521 .dev_id = d, \
522 .con_id = n, \
523 .clk = &c, \
524 },
525
526 static struct clk_lookup lookups[] = {
527 _REGISTER_CLOCK(NULL, "emi", emi_clk)
528 _REGISTER_CLOCK("imx31-cspi.0", NULL, cspi1_clk)
529 _REGISTER_CLOCK("imx31-cspi.1", NULL, cspi2_clk)
530 _REGISTER_CLOCK("imx31-cspi.2", NULL, cspi3_clk)
531 _REGISTER_CLOCK(NULL, "gpt", gpt_clk)
532 _REGISTER_CLOCK(NULL, "pwm", pwm_clk)
533 _REGISTER_CLOCK("imx2-wdt.0", NULL, wdog_clk)
534 _REGISTER_CLOCK(NULL, "rtc", rtc_clk)
535 _REGISTER_CLOCK(NULL, "epit", epit1_clk)
536 _REGISTER_CLOCK(NULL, "epit", epit2_clk)
537 _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
538 _REGISTER_CLOCK("ipu-core", NULL, ipu_clk)
539 _REGISTER_CLOCK("mx3_sdc_fb", NULL, ipu_clk)
540 _REGISTER_CLOCK(NULL, "kpp", kpp_clk)
541 _REGISTER_CLOCK("mxc-ehci.0", "usb", usb_clk1)
542 _REGISTER_CLOCK("mxc-ehci.0", "usb_ahb", usb_clk2)
543 _REGISTER_CLOCK("mxc-ehci.1", "usb", usb_clk1)
544 _REGISTER_CLOCK("mxc-ehci.1", "usb_ahb", usb_clk2)
545 _REGISTER_CLOCK("mxc-ehci.2", "usb", usb_clk1)
546 _REGISTER_CLOCK("mxc-ehci.2", "usb_ahb", usb_clk2)
547 _REGISTER_CLOCK("fsl-usb2-udc", "usb", usb_clk1)
548 _REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", usb_clk2)
549 _REGISTER_CLOCK("mx3-camera.0", NULL, csi_clk)
550 /* i.mx31 has the i.mx21 type uart */
551 _REGISTER_CLOCK("imx21-uart.0", NULL, uart1_clk)
552 _REGISTER_CLOCK("imx21-uart.1", NULL, uart2_clk)
553 _REGISTER_CLOCK("imx21-uart.2", NULL, uart3_clk)
554 _REGISTER_CLOCK("imx21-uart.3", NULL, uart4_clk)
555 _REGISTER_CLOCK("imx21-uart.4", NULL, uart5_clk)
556 _REGISTER_CLOCK("imx-i2c.0", NULL, i2c1_clk)
557 _REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
558 _REGISTER_CLOCK("imx-i2c.2", NULL, i2c3_clk)
559 _REGISTER_CLOCK("mxc_w1.0", NULL, owire_clk)
560 _REGISTER_CLOCK("mxc-mmc.0", NULL, sdhc1_clk)
561 _REGISTER_CLOCK("mxc-mmc.1", NULL, sdhc2_clk)
562 _REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk)
563 _REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk)
564 _REGISTER_CLOCK(NULL, "firi", firi_clk)
565 _REGISTER_CLOCK("pata_imx", NULL, pata_clk)
566 _REGISTER_CLOCK(NULL, "rtic", rtic_clk)
567 _REGISTER_CLOCK(NULL, "rng", rng_clk)
568 _REGISTER_CLOCK("imx31-sdma", NULL, sdma_clk1)
569 _REGISTER_CLOCK(NULL, "sdma_ipg", sdma_clk2)
570 _REGISTER_CLOCK(NULL, "mstick", mstick1_clk)
571 _REGISTER_CLOCK(NULL, "mstick", mstick2_clk)
572 _REGISTER_CLOCK(NULL, "scc", scc_clk)
573 _REGISTER_CLOCK(NULL, "iim", iim_clk)
574 _REGISTER_CLOCK(NULL, "mpeg4", mpeg4_clk)
575 _REGISTER_CLOCK(NULL, "mbx", mbx_clk)
576 };
577
mx31_clocks_init(unsigned long fref)578 int __init mx31_clocks_init(unsigned long fref)
579 {
580 u32 reg;
581
582 ckih_rate = fref;
583
584 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
585
586 /* change the csi_clk parent if necessary */
587 reg = __raw_readl(MXC_CCM_CCMR);
588 if (!(reg & MXC_CCM_CCMR_CSCS))
589 if (clk_set_parent(&csi_clk, &usb_pll_clk))
590 pr_err("%s: error changing csi_clk parent\n", __func__);
591
592
593 /* Turn off all possible clocks */
594 __raw_writel((3 << 4), MXC_CCM_CGR0);
595 __raw_writel(0, MXC_CCM_CGR1);
596 __raw_writel((3 << 8) | (3 << 14) | (3 << 16)|
597 1 << 27 | 1 << 28, /* Bit 27 and 28 are not defined for
598 MX32, but still required to be set */
599 MXC_CCM_CGR2);
600
601 /*
602 * Before turning off usb_pll make sure ipg_per_clk is generated
603 * by ipg_clk and not usb_pll.
604 */
605 __raw_writel(__raw_readl(MXC_CCM_CCMR) | (1 << 24), MXC_CCM_CCMR);
606
607 usb_pll_disable(&usb_pll_clk);
608
609 pr_info("Clock input source is %ld\n", clk_get_rate(&ckih_clk));
610
611 clk_enable(&gpt_clk);
612 clk_enable(&emi_clk);
613 clk_enable(&iim_clk);
614 mx31_revision();
615 clk_disable(&iim_clk);
616
617 clk_enable(&serial_pll_clk);
618
619 if (mx31_revision() >= IMX_CHIP_REVISION_2_0) {
620 reg = __raw_readl(MXC_CCM_PMCR1);
621 /* No PLL restart on DVFS switch; enable auto EMI handshake */
622 reg |= MXC_CCM_PMCR1_PLLRDIS | MXC_CCM_PMCR1_EMIRQ_EN;
623 __raw_writel(reg, MXC_CCM_PMCR1);
624 }
625
626 mxc_timer_init(&ipg_clk, MX31_IO_ADDRESS(MX31_GPT1_BASE_ADDR),
627 MX31_INT_GPT);
628
629 return 0;
630 }
631