1 /*
2 * Copyright (C) 2009 by Sascha Hauer, Pengutronix
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
16 * MA 02110-1301, USA.
17 */
18
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/list.h>
22 #include <linux/clk.h>
23 #include <linux/io.h>
24 #include <linux/clkdev.h>
25
26 #include <mach/clock.h>
27 #include <mach/hardware.h>
28 #include <mach/common.h>
29
30 #define CCM_BASE MX35_IO_ADDRESS(MX35_CCM_BASE_ADDR)
31
32 #define CCM_CCMR 0x00
33 #define CCM_PDR0 0x04
34 #define CCM_PDR1 0x08
35 #define CCM_PDR2 0x0C
36 #define CCM_PDR3 0x10
37 #define CCM_PDR4 0x14
38 #define CCM_RCSR 0x18
39 #define CCM_MPCTL 0x1C
40 #define CCM_PPCTL 0x20
41 #define CCM_ACMR 0x24
42 #define CCM_COSR 0x28
43 #define CCM_CGR0 0x2C
44 #define CCM_CGR1 0x30
45 #define CCM_CGR2 0x34
46 #define CCM_CGR3 0x38
47
48 #ifdef HAVE_SET_RATE_SUPPORT
calc_dividers(u32 div,u32 * pre,u32 * post,u32 maxpost)49 static void calc_dividers(u32 div, u32 *pre, u32 *post, u32 maxpost)
50 {
51 u32 min_pre, temp_pre, old_err, err;
52
53 min_pre = (div - 1) / maxpost + 1;
54 old_err = 8;
55
56 for (temp_pre = 8; temp_pre >= min_pre; temp_pre--) {
57 if (div > (temp_pre * maxpost))
58 break;
59
60 if (div < (temp_pre * temp_pre))
61 continue;
62
63 err = div % temp_pre;
64
65 if (err == 0) {
66 *pre = temp_pre;
67 break;
68 }
69
70 err = temp_pre - err;
71
72 if (err < old_err) {
73 old_err = err;
74 *pre = temp_pre;
75 }
76 }
77
78 *post = (div + *pre - 1) / *pre;
79 }
80
81 /* get the best values for a 3-bit divider combined with a 6-bit divider */
calc_dividers_3_6(u32 div,u32 * pre,u32 * post)82 static void calc_dividers_3_6(u32 div, u32 *pre, u32 *post)
83 {
84 if (div >= 512) {
85 *pre = 8;
86 *post = 64;
87 } else if (div >= 64) {
88 calc_dividers(div, pre, post, 64);
89 } else if (div <= 8) {
90 *pre = div;
91 *post = 1;
92 } else {
93 *pre = 1;
94 *post = div;
95 }
96 }
97
98 /* get the best values for two cascaded 3-bit dividers */
calc_dividers_3_3(u32 div,u32 * pre,u32 * post)99 static void calc_dividers_3_3(u32 div, u32 *pre, u32 *post)
100 {
101 if (div >= 64) {
102 *pre = *post = 8;
103 } else if (div > 8) {
104 calc_dividers(div, pre, post, 8);
105 } else {
106 *pre = 1;
107 *post = div;
108 }
109 }
110 #endif
111
get_rate_mpll(void)112 static unsigned long get_rate_mpll(void)
113 {
114 ulong mpctl = __raw_readl(CCM_BASE + CCM_MPCTL);
115
116 return mxc_decode_pll(mpctl, 24000000);
117 }
118
get_rate_ppll(void)119 static unsigned long get_rate_ppll(void)
120 {
121 ulong ppctl = __raw_readl(CCM_BASE + CCM_PPCTL);
122
123 return mxc_decode_pll(ppctl, 24000000);
124 }
125
126 struct arm_ahb_div {
127 unsigned char arm, ahb, sel;
128 };
129
130 static struct arm_ahb_div clk_consumer[] = {
131 { .arm = 1, .ahb = 4, .sel = 0},
132 { .arm = 1, .ahb = 3, .sel = 1},
133 { .arm = 2, .ahb = 2, .sel = 0},
134 { .arm = 0, .ahb = 0, .sel = 0},
135 { .arm = 0, .ahb = 0, .sel = 0},
136 { .arm = 0, .ahb = 0, .sel = 0},
137 { .arm = 4, .ahb = 1, .sel = 0},
138 { .arm = 1, .ahb = 5, .sel = 0},
139 { .arm = 1, .ahb = 8, .sel = 0},
140 { .arm = 1, .ahb = 6, .sel = 1},
141 { .arm = 2, .ahb = 4, .sel = 0},
142 { .arm = 0, .ahb = 0, .sel = 0},
143 { .arm = 0, .ahb = 0, .sel = 0},
144 { .arm = 0, .ahb = 0, .sel = 0},
145 { .arm = 4, .ahb = 2, .sel = 0},
146 { .arm = 0, .ahb = 0, .sel = 0},
147 };
148
get_rate_arm(void)149 static unsigned long get_rate_arm(void)
150 {
151 unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
152 struct arm_ahb_div *aad;
153 unsigned long fref = get_rate_mpll();
154
155 aad = &clk_consumer[(pdr0 >> 16) & 0xf];
156 if (aad->sel)
157 fref = fref * 3 / 4;
158
159 return fref / aad->arm;
160 }
161
get_rate_ahb(struct clk * clk)162 static unsigned long get_rate_ahb(struct clk *clk)
163 {
164 unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
165 struct arm_ahb_div *aad;
166 unsigned long fref = get_rate_arm();
167
168 aad = &clk_consumer[(pdr0 >> 16) & 0xf];
169
170 return fref / aad->ahb;
171 }
172
get_rate_ipg(struct clk * clk)173 static unsigned long get_rate_ipg(struct clk *clk)
174 {
175 return get_rate_ahb(NULL) >> 1;
176 }
177
get_rate_uart(struct clk * clk)178 static unsigned long get_rate_uart(struct clk *clk)
179 {
180 unsigned long pdr3 = __raw_readl(CCM_BASE + CCM_PDR3);
181 unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
182 unsigned long div = ((pdr4 >> 10) & 0x3f) + 1;
183
184 if (pdr3 & (1 << 14))
185 return get_rate_arm() / div;
186 else
187 return get_rate_ppll() / div;
188 }
189
get_rate_sdhc(struct clk * clk)190 static unsigned long get_rate_sdhc(struct clk *clk)
191 {
192 unsigned long pdr3 = __raw_readl(CCM_BASE + CCM_PDR3);
193 unsigned long div, rate;
194
195 if (pdr3 & (1 << 6))
196 rate = get_rate_arm();
197 else
198 rate = get_rate_ppll();
199
200 switch (clk->id) {
201 default:
202 case 0:
203 div = pdr3 & 0x3f;
204 break;
205 case 1:
206 div = (pdr3 >> 8) & 0x3f;
207 break;
208 case 2:
209 div = (pdr3 >> 16) & 0x3f;
210 break;
211 }
212
213 return rate / (div + 1);
214 }
215
get_rate_mshc(struct clk * clk)216 static unsigned long get_rate_mshc(struct clk *clk)
217 {
218 unsigned long pdr1 = __raw_readl(CCM_BASE + CCM_PDR1);
219 unsigned long div1, div2, rate;
220
221 if (pdr1 & (1 << 7))
222 rate = get_rate_arm();
223 else
224 rate = get_rate_ppll();
225
226 div1 = (pdr1 >> 29) & 0x7;
227 div2 = (pdr1 >> 22) & 0x3f;
228
229 return rate / ((div1 + 1) * (div2 + 1));
230 }
231
get_rate_ssi(struct clk * clk)232 static unsigned long get_rate_ssi(struct clk *clk)
233 {
234 unsigned long pdr2 = __raw_readl(CCM_BASE + CCM_PDR2);
235 unsigned long div1, div2, rate;
236
237 if (pdr2 & (1 << 6))
238 rate = get_rate_arm();
239 else
240 rate = get_rate_ppll();
241
242 switch (clk->id) {
243 default:
244 case 0:
245 div1 = pdr2 & 0x3f;
246 div2 = (pdr2 >> 24) & 0x7;
247 break;
248 case 1:
249 div1 = (pdr2 >> 8) & 0x3f;
250 div2 = (pdr2 >> 27) & 0x7;
251 break;
252 }
253
254 return rate / ((div1 + 1) * (div2 + 1));
255 }
256
get_rate_csi(struct clk * clk)257 static unsigned long get_rate_csi(struct clk *clk)
258 {
259 unsigned long pdr2 = __raw_readl(CCM_BASE + CCM_PDR2);
260 unsigned long rate;
261
262 if (pdr2 & (1 << 7))
263 rate = get_rate_arm();
264 else
265 rate = get_rate_ppll();
266
267 return rate / (((pdr2 >> 16) & 0x3f) + 1);
268 }
269
get_rate_otg(struct clk * clk)270 static unsigned long get_rate_otg(struct clk *clk)
271 {
272 unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
273 unsigned long rate;
274
275 if (pdr4 & (1 << 9))
276 rate = get_rate_arm();
277 else
278 rate = get_rate_ppll();
279
280 return rate / (((pdr4 >> 22) & 0x3f) + 1);
281 }
282
get_rate_ipg_per(struct clk * clk)283 static unsigned long get_rate_ipg_per(struct clk *clk)
284 {
285 unsigned long pdr0 = __raw_readl(CCM_BASE + CCM_PDR0);
286 unsigned long pdr4 = __raw_readl(CCM_BASE + CCM_PDR4);
287 unsigned long div;
288
289 if (pdr0 & (1 << 26)) {
290 div = (pdr4 >> 16) & 0x3f;
291 return get_rate_arm() / (div + 1);
292 } else {
293 div = (pdr0 >> 12) & 0x7;
294 return get_rate_ahb(NULL) / (div + 1);
295 }
296 }
297
get_rate_hsp(struct clk * clk)298 static unsigned long get_rate_hsp(struct clk *clk)
299 {
300 unsigned long hsp_podf = (__raw_readl(CCM_BASE + CCM_PDR0) >> 20) & 0x03;
301 unsigned long fref = get_rate_mpll();
302
303 if (fref > 400 * 1000 * 1000) {
304 switch (hsp_podf) {
305 case 0:
306 return fref >> 2;
307 case 1:
308 return fref >> 3;
309 case 2:
310 return fref / 3;
311 }
312 } else {
313 switch (hsp_podf) {
314 case 0:
315 case 2:
316 return fref / 3;
317 case 1:
318 return fref / 6;
319 }
320 }
321
322 return 0;
323 }
324
clk_cgr_enable(struct clk * clk)325 static int clk_cgr_enable(struct clk *clk)
326 {
327 u32 reg;
328
329 reg = __raw_readl(clk->enable_reg);
330 reg |= 3 << clk->enable_shift;
331 __raw_writel(reg, clk->enable_reg);
332
333 return 0;
334 }
335
clk_cgr_disable(struct clk * clk)336 static void clk_cgr_disable(struct clk *clk)
337 {
338 u32 reg;
339
340 reg = __raw_readl(clk->enable_reg);
341 reg &= ~(3 << clk->enable_shift);
342 __raw_writel(reg, clk->enable_reg);
343 }
344
345 #define DEFINE_CLOCK(name, i, er, es, gr, sr) \
346 static struct clk name = { \
347 .id = i, \
348 .enable_reg = CCM_BASE + er, \
349 .enable_shift = es, \
350 .get_rate = gr, \
351 .set_rate = sr, \
352 .enable = clk_cgr_enable, \
353 .disable = clk_cgr_disable, \
354 }
355
356 DEFINE_CLOCK(asrc_clk, 0, CCM_CGR0, 0, NULL, NULL);
357 DEFINE_CLOCK(pata_clk, 0, CCM_CGR0, 2, get_rate_ipg, NULL);
358 /* DEFINE_CLOCK(audmux_clk, 0, CCM_CGR0, 4, NULL, NULL); */
359 DEFINE_CLOCK(can1_clk, 0, CCM_CGR0, 6, get_rate_ipg, NULL);
360 DEFINE_CLOCK(can2_clk, 1, CCM_CGR0, 8, get_rate_ipg, NULL);
361 DEFINE_CLOCK(cspi1_clk, 0, CCM_CGR0, 10, get_rate_ipg, NULL);
362 DEFINE_CLOCK(cspi2_clk, 1, CCM_CGR0, 12, get_rate_ipg, NULL);
363 DEFINE_CLOCK(ect_clk, 0, CCM_CGR0, 14, get_rate_ipg, NULL);
364 DEFINE_CLOCK(edio_clk, 0, CCM_CGR0, 16, NULL, NULL);
365 DEFINE_CLOCK(emi_clk, 0, CCM_CGR0, 18, get_rate_ipg, NULL);
366 DEFINE_CLOCK(epit1_clk, 0, CCM_CGR0, 20, get_rate_ipg, NULL);
367 DEFINE_CLOCK(epit2_clk, 1, CCM_CGR0, 22, get_rate_ipg, NULL);
368 DEFINE_CLOCK(esai_clk, 0, CCM_CGR0, 24, NULL, NULL);
369 DEFINE_CLOCK(esdhc1_clk, 0, CCM_CGR0, 26, get_rate_sdhc, NULL);
370 DEFINE_CLOCK(esdhc2_clk, 1, CCM_CGR0, 28, get_rate_sdhc, NULL);
371 DEFINE_CLOCK(esdhc3_clk, 2, CCM_CGR0, 30, get_rate_sdhc, NULL);
372
373 DEFINE_CLOCK(fec_clk, 0, CCM_CGR1, 0, get_rate_ipg, NULL);
374 DEFINE_CLOCK(gpio1_clk, 0, CCM_CGR1, 2, NULL, NULL);
375 DEFINE_CLOCK(gpio2_clk, 1, CCM_CGR1, 4, NULL, NULL);
376 DEFINE_CLOCK(gpio3_clk, 2, CCM_CGR1, 6, NULL, NULL);
377 DEFINE_CLOCK(gpt_clk, 0, CCM_CGR1, 8, get_rate_ipg, NULL);
378 DEFINE_CLOCK(i2c1_clk, 0, CCM_CGR1, 10, get_rate_ipg_per, NULL);
379 DEFINE_CLOCK(i2c2_clk, 1, CCM_CGR1, 12, get_rate_ipg_per, NULL);
380 DEFINE_CLOCK(i2c3_clk, 2, CCM_CGR1, 14, get_rate_ipg_per, NULL);
381 DEFINE_CLOCK(iomuxc_clk, 0, CCM_CGR1, 16, NULL, NULL);
382 DEFINE_CLOCK(ipu_clk, 0, CCM_CGR1, 18, get_rate_hsp, NULL);
383 DEFINE_CLOCK(kpp_clk, 0, CCM_CGR1, 20, get_rate_ipg, NULL);
384 DEFINE_CLOCK(mlb_clk, 0, CCM_CGR1, 22, get_rate_ahb, NULL);
385 DEFINE_CLOCK(mshc_clk, 0, CCM_CGR1, 24, get_rate_mshc, NULL);
386 DEFINE_CLOCK(owire_clk, 0, CCM_CGR1, 26, get_rate_ipg_per, NULL);
387 DEFINE_CLOCK(pwm_clk, 0, CCM_CGR1, 28, get_rate_ipg_per, NULL);
388 DEFINE_CLOCK(rngc_clk, 0, CCM_CGR1, 30, get_rate_ipg, NULL);
389
390 DEFINE_CLOCK(rtc_clk, 0, CCM_CGR2, 0, get_rate_ipg, NULL);
391 DEFINE_CLOCK(rtic_clk, 0, CCM_CGR2, 2, get_rate_ahb, NULL);
392 DEFINE_CLOCK(scc_clk, 0, CCM_CGR2, 4, get_rate_ipg, NULL);
393 DEFINE_CLOCK(sdma_clk, 0, CCM_CGR2, 6, NULL, NULL);
394 DEFINE_CLOCK(spba_clk, 0, CCM_CGR2, 8, get_rate_ipg, NULL);
395 DEFINE_CLOCK(spdif_clk, 0, CCM_CGR2, 10, NULL, NULL);
396 DEFINE_CLOCK(ssi1_clk, 0, CCM_CGR2, 12, get_rate_ssi, NULL);
397 DEFINE_CLOCK(ssi2_clk, 1, CCM_CGR2, 14, get_rate_ssi, NULL);
398 DEFINE_CLOCK(uart1_clk, 0, CCM_CGR2, 16, get_rate_uart, NULL);
399 DEFINE_CLOCK(uart2_clk, 1, CCM_CGR2, 18, get_rate_uart, NULL);
400 DEFINE_CLOCK(uart3_clk, 2, CCM_CGR2, 20, get_rate_uart, NULL);
401 DEFINE_CLOCK(usbotg_clk, 0, CCM_CGR2, 22, get_rate_otg, NULL);
402 DEFINE_CLOCK(wdog_clk, 0, CCM_CGR2, 24, NULL, NULL);
403 DEFINE_CLOCK(max_clk, 0, CCM_CGR2, 26, NULL, NULL);
404 DEFINE_CLOCK(audmux_clk, 0, CCM_CGR2, 30, NULL, NULL);
405
406 DEFINE_CLOCK(csi_clk, 0, CCM_CGR3, 0, get_rate_csi, NULL);
407 DEFINE_CLOCK(iim_clk, 0, CCM_CGR3, 2, NULL, NULL);
408 DEFINE_CLOCK(gpu2d_clk, 0, CCM_CGR3, 4, NULL, NULL);
409
410 DEFINE_CLOCK(usbahb_clk, 0, 0, 0, get_rate_ahb, NULL);
411
clk_dummy_enable(struct clk * clk)412 static int clk_dummy_enable(struct clk *clk)
413 {
414 return 0;
415 }
416
clk_dummy_disable(struct clk * clk)417 static void clk_dummy_disable(struct clk *clk)
418 {
419 }
420
get_rate_nfc(struct clk * clk)421 static unsigned long get_rate_nfc(struct clk *clk)
422 {
423 unsigned long div1;
424
425 div1 = (__raw_readl(CCM_BASE + CCM_PDR4) >> 28) + 1;
426
427 return get_rate_ahb(NULL) / div1;
428 }
429
430 /* NAND Controller: It seems it can't be disabled */
431 static struct clk nfc_clk = {
432 .id = 0,
433 .enable_reg = 0,
434 .enable_shift = 0,
435 .get_rate = get_rate_nfc,
436 .set_rate = NULL, /* set_rate_nfc, */
437 .enable = clk_dummy_enable,
438 .disable = clk_dummy_disable
439 };
440
441 #define _REGISTER_CLOCK(d, n, c) \
442 { \
443 .dev_id = d, \
444 .con_id = n, \
445 .clk = &c, \
446 },
447
448 static struct clk_lookup lookups[] = {
449 _REGISTER_CLOCK(NULL, "asrc", asrc_clk)
450 _REGISTER_CLOCK("pata_imx", NULL, pata_clk)
451 _REGISTER_CLOCK("flexcan.0", NULL, can1_clk)
452 _REGISTER_CLOCK("flexcan.1", NULL, can2_clk)
453 _REGISTER_CLOCK("imx35-cspi.0", NULL, cspi1_clk)
454 _REGISTER_CLOCK("imx35-cspi.1", NULL, cspi2_clk)
455 _REGISTER_CLOCK(NULL, "ect", ect_clk)
456 _REGISTER_CLOCK(NULL, "edio", edio_clk)
457 _REGISTER_CLOCK(NULL, "emi", emi_clk)
458 _REGISTER_CLOCK("imx-epit.0", NULL, epit1_clk)
459 _REGISTER_CLOCK("imx-epit.1", NULL, epit2_clk)
460 _REGISTER_CLOCK(NULL, "esai", esai_clk)
461 _REGISTER_CLOCK("sdhci-esdhc-imx35.0", NULL, esdhc1_clk)
462 _REGISTER_CLOCK("sdhci-esdhc-imx35.1", NULL, esdhc2_clk)
463 _REGISTER_CLOCK("sdhci-esdhc-imx35.2", NULL, esdhc3_clk)
464 /* i.mx35 has the i.mx27 type fec */
465 _REGISTER_CLOCK("imx27-fec.0", NULL, fec_clk)
466 _REGISTER_CLOCK(NULL, "gpio", gpio1_clk)
467 _REGISTER_CLOCK(NULL, "gpio", gpio2_clk)
468 _REGISTER_CLOCK(NULL, "gpio", gpio3_clk)
469 _REGISTER_CLOCK("gpt.0", NULL, gpt_clk)
470 _REGISTER_CLOCK("imx-i2c.0", NULL, i2c1_clk)
471 _REGISTER_CLOCK("imx-i2c.1", NULL, i2c2_clk)
472 _REGISTER_CLOCK("imx-i2c.2", NULL, i2c3_clk)
473 _REGISTER_CLOCK(NULL, "iomuxc", iomuxc_clk)
474 _REGISTER_CLOCK("ipu-core", NULL, ipu_clk)
475 _REGISTER_CLOCK("mx3_sdc_fb", NULL, ipu_clk)
476 _REGISTER_CLOCK(NULL, "kpp", kpp_clk)
477 _REGISTER_CLOCK(NULL, "mlb", mlb_clk)
478 _REGISTER_CLOCK(NULL, "mshc", mshc_clk)
479 _REGISTER_CLOCK("mxc_w1", NULL, owire_clk)
480 _REGISTER_CLOCK(NULL, "pwm", pwm_clk)
481 _REGISTER_CLOCK(NULL, "rngc", rngc_clk)
482 _REGISTER_CLOCK(NULL, "rtc", rtc_clk)
483 _REGISTER_CLOCK(NULL, "rtic", rtic_clk)
484 _REGISTER_CLOCK(NULL, "scc", scc_clk)
485 _REGISTER_CLOCK("imx35-sdma", NULL, sdma_clk)
486 _REGISTER_CLOCK(NULL, "spba", spba_clk)
487 _REGISTER_CLOCK(NULL, "spdif", spdif_clk)
488 _REGISTER_CLOCK("imx-ssi.0", NULL, ssi1_clk)
489 _REGISTER_CLOCK("imx-ssi.1", NULL, ssi2_clk)
490 /* i.mx35 has the i.mx21 type uart */
491 _REGISTER_CLOCK("imx21-uart.0", NULL, uart1_clk)
492 _REGISTER_CLOCK("imx21-uart.1", NULL, uart2_clk)
493 _REGISTER_CLOCK("imx21-uart.2", NULL, uart3_clk)
494 _REGISTER_CLOCK("mxc-ehci.0", "usb", usbotg_clk)
495 _REGISTER_CLOCK("mxc-ehci.1", "usb", usbotg_clk)
496 _REGISTER_CLOCK("mxc-ehci.2", "usb", usbotg_clk)
497 _REGISTER_CLOCK("fsl-usb2-udc", "usb", usbotg_clk)
498 _REGISTER_CLOCK("fsl-usb2-udc", "usb_ahb", usbahb_clk)
499 _REGISTER_CLOCK("imx2-wdt.0", NULL, wdog_clk)
500 _REGISTER_CLOCK(NULL, "max", max_clk)
501 _REGISTER_CLOCK(NULL, "audmux", audmux_clk)
502 _REGISTER_CLOCK(NULL, "csi", csi_clk)
503 _REGISTER_CLOCK(NULL, "iim", iim_clk)
504 _REGISTER_CLOCK(NULL, "gpu2d", gpu2d_clk)
505 _REGISTER_CLOCK("mxc_nand.0", NULL, nfc_clk)
506 };
507
mx35_clocks_init()508 int __init mx35_clocks_init()
509 {
510 unsigned int cgr2 = 3 << 26;
511
512 #if defined(CONFIG_DEBUG_LL) && !defined(CONFIG_DEBUG_ICEDCC)
513 cgr2 |= 3 << 16;
514 #endif
515
516 clkdev_add_table(lookups, ARRAY_SIZE(lookups));
517
518 /* Turn off all clocks except the ones we need to survive, namely:
519 * EMI, GPIO1/2/3, GPT, IOMUX, MAX and eventually uart
520 */
521 __raw_writel((3 << 18), CCM_BASE + CCM_CGR0);
522 __raw_writel((3 << 2) | (3 << 4) | (3 << 6) | (3 << 8) | (3 << 16),
523 CCM_BASE + CCM_CGR1);
524 __raw_writel(cgr2, CCM_BASE + CCM_CGR2);
525 __raw_writel(0, CCM_BASE + CCM_CGR3);
526
527 clk_enable(&iim_clk);
528 imx_print_silicon_rev("i.MX35", mx35_revision());
529 clk_disable(&iim_clk);
530
531 /*
532 * Check if we came up in internal boot mode. If yes, we need some
533 * extra clocks turned on, otherwise the MX35 boot ROM code will
534 * hang after a watchdog reset.
535 */
536 if (!(__raw_readl(CCM_BASE + CCM_RCSR) & (3 << 10))) {
537 /* Additionally turn on UART1, SCC, and IIM clocks */
538 clk_enable(&iim_clk);
539 clk_enable(&uart1_clk);
540 clk_enable(&scc_clk);
541 }
542
543 #ifdef CONFIG_MXC_USE_EPIT
544 epit_timer_init(&epit1_clk,
545 MX35_IO_ADDRESS(MX35_EPIT1_BASE_ADDR), MX35_INT_EPIT1);
546 #else
547 mxc_timer_init(&gpt_clk,
548 MX35_IO_ADDRESS(MX35_GPT1_BASE_ADDR), MX35_INT_GPT);
549 #endif
550
551 return 0;
552 }
553