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a21765a7 | 1 | /* linux/arch/arm/mach-s3c2412/clock.c |
736855f0 BD |
2 | * |
3 | * Copyright (c) 2006 Simtec Electronics | |
4 | * Ben Dooks <ben@simtec.co.uk> | |
5 | * | |
6 | * S3C2412,S3C2413 Clock control support | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <linux/init.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/errno.h> | |
28 | #include <linux/err.h> | |
29 | #include <linux/sysdev.h> | |
30 | #include <linux/clk.h> | |
31 | #include <linux/mutex.h> | |
32 | #include <linux/delay.h> | |
b6d1f542 | 33 | #include <linux/serial_core.h> |
fced80c7 | 34 | #include <linux/io.h> |
736855f0 | 35 | |
7ae9e420 BD |
36 | #include <asm/mach/map.h> |
37 | ||
a09e64fb | 38 | #include <mach/hardware.h> |
736855f0 | 39 | |
a2b7ba9c | 40 | #include <plat/regs-serial.h> |
a09e64fb RK |
41 | #include <mach/regs-clock.h> |
42 | #include <mach/regs-gpio.h> | |
736855f0 | 43 | |
d5120ae7 BD |
44 | #include <plat/s3c2412.h> |
45 | #include <plat/clock.h> | |
a2b7ba9c | 46 | #include <plat/cpu.h> |
736855f0 BD |
47 | |
48 | /* We currently have to assume that the system is running | |
49 | * from the XTPll input, and that all ***REFCLKs are being | |
50 | * fed from it, as we cannot read the state of OM[4] from | |
51 | * software. | |
52 | * | |
53 | * It would be possible for each board initialisation to | |
54 | * set the correct muxing at initialisation | |
55 | */ | |
56 | ||
7ae9e420 | 57 | static int s3c2412_clkcon_enable(struct clk *clk, int enable) |
736855f0 BD |
58 | { |
59 | unsigned int clocks = clk->ctrlbit; | |
60 | unsigned long clkcon; | |
61 | ||
62 | clkcon = __raw_readl(S3C2410_CLKCON); | |
63 | ||
64 | if (enable) | |
65 | clkcon |= clocks; | |
66 | else | |
67 | clkcon &= ~clocks; | |
68 | ||
69 | __raw_writel(clkcon, S3C2410_CLKCON); | |
70 | ||
71 | return 0; | |
72 | } | |
73 | ||
74 | static int s3c2412_upll_enable(struct clk *clk, int enable) | |
75 | { | |
76 | unsigned long upllcon = __raw_readl(S3C2410_UPLLCON); | |
77 | unsigned long orig = upllcon; | |
78 | ||
79 | if (!enable) | |
80 | upllcon |= S3C2412_PLLCON_OFF; | |
81 | else | |
82 | upllcon &= ~S3C2412_PLLCON_OFF; | |
83 | ||
84 | __raw_writel(upllcon, S3C2410_UPLLCON); | |
85 | ||
86 | /* allow ~150uS for the PLL to settle and lock */ | |
87 | ||
88 | if (enable && (orig & S3C2412_PLLCON_OFF)) | |
89 | udelay(150); | |
90 | ||
91 | return 0; | |
92 | } | |
93 | ||
94 | /* clock selections */ | |
95 | ||
736855f0 BD |
96 | static struct clk clk_erefclk = { |
97 | .name = "erefclk", | |
98 | .id = -1, | |
99 | }; | |
100 | ||
101 | static struct clk clk_urefclk = { | |
102 | .name = "urefclk", | |
103 | .id = -1, | |
104 | }; | |
105 | ||
106 | static int s3c2412_setparent_usysclk(struct clk *clk, struct clk *parent) | |
107 | { | |
108 | unsigned long clksrc = __raw_readl(S3C2412_CLKSRC); | |
109 | ||
110 | if (parent == &clk_urefclk) | |
111 | clksrc &= ~S3C2412_CLKSRC_USYSCLK_UPLL; | |
112 | else if (parent == &clk_upll) | |
113 | clksrc |= S3C2412_CLKSRC_USYSCLK_UPLL; | |
114 | else | |
115 | return -EINVAL; | |
116 | ||
117 | clk->parent = parent; | |
118 | ||
119 | __raw_writel(clksrc, S3C2412_CLKSRC); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static struct clk clk_usysclk = { | |
124 | .name = "usysclk", | |
125 | .id = -1, | |
126 | .parent = &clk_xtal, | |
b3bf41be BD |
127 | .ops = &(struct clk_ops) { |
128 | .set_parent = s3c2412_setparent_usysclk, | |
129 | }, | |
736855f0 BD |
130 | }; |
131 | ||
132 | static struct clk clk_mrefclk = { | |
133 | .name = "mrefclk", | |
134 | .parent = &clk_xtal, | |
135 | .id = -1, | |
136 | }; | |
137 | ||
138 | static struct clk clk_mdivclk = { | |
139 | .name = "mdivclk", | |
140 | .parent = &clk_xtal, | |
141 | .id = -1, | |
142 | }; | |
143 | ||
144 | static int s3c2412_setparent_usbsrc(struct clk *clk, struct clk *parent) | |
145 | { | |
146 | unsigned long clksrc = __raw_readl(S3C2412_CLKSRC); | |
147 | ||
148 | if (parent == &clk_usysclk) | |
149 | clksrc &= ~S3C2412_CLKSRC_USBCLK_HCLK; | |
150 | else if (parent == &clk_h) | |
151 | clksrc |= S3C2412_CLKSRC_USBCLK_HCLK; | |
152 | else | |
153 | return -EINVAL; | |
154 | ||
155 | clk->parent = parent; | |
156 | ||
157 | __raw_writel(clksrc, S3C2412_CLKSRC); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | static unsigned long s3c2412_roundrate_usbsrc(struct clk *clk, | |
162 | unsigned long rate) | |
163 | { | |
164 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
165 | int div; | |
166 | ||
167 | if (rate > parent_rate) | |
168 | return parent_rate; | |
169 | ||
170 | div = parent_rate / rate; | |
171 | if (div > 2) | |
172 | div = 2; | |
173 | ||
174 | return parent_rate / div; | |
175 | } | |
176 | ||
177 | static unsigned long s3c2412_getrate_usbsrc(struct clk *clk) | |
178 | { | |
179 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
180 | unsigned long div = __raw_readl(S3C2410_CLKDIVN); | |
181 | ||
182 | return parent_rate / ((div & S3C2412_CLKDIVN_USB48DIV) ? 2 : 1); | |
183 | } | |
184 | ||
185 | static int s3c2412_setrate_usbsrc(struct clk *clk, unsigned long rate) | |
186 | { | |
187 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
188 | unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN); | |
189 | ||
190 | rate = s3c2412_roundrate_usbsrc(clk, rate); | |
191 | ||
192 | if ((parent_rate / rate) == 2) | |
193 | clkdivn |= S3C2412_CLKDIVN_USB48DIV; | |
194 | else | |
195 | clkdivn &= ~S3C2412_CLKDIVN_USB48DIV; | |
196 | ||
197 | __raw_writel(clkdivn, S3C2410_CLKDIVN); | |
198 | return 0; | |
199 | } | |
200 | ||
201 | static struct clk clk_usbsrc = { | |
202 | .name = "usbsrc", | |
203 | .id = -1, | |
b3bf41be BD |
204 | .ops = &(struct clk_ops) { |
205 | .get_rate = s3c2412_getrate_usbsrc, | |
206 | .set_rate = s3c2412_setrate_usbsrc, | |
207 | .round_rate = s3c2412_roundrate_usbsrc, | |
208 | .set_parent = s3c2412_setparent_usbsrc, | |
209 | }, | |
736855f0 BD |
210 | }; |
211 | ||
212 | static int s3c2412_setparent_msysclk(struct clk *clk, struct clk *parent) | |
213 | { | |
214 | unsigned long clksrc = __raw_readl(S3C2412_CLKSRC); | |
215 | ||
216 | if (parent == &clk_mdivclk) | |
217 | clksrc &= ~S3C2412_CLKSRC_MSYSCLK_MPLL; | |
cca851d7 | 218 | else if (parent == &clk_mpll) |
736855f0 BD |
219 | clksrc |= S3C2412_CLKSRC_MSYSCLK_MPLL; |
220 | else | |
221 | return -EINVAL; | |
222 | ||
223 | clk->parent = parent; | |
224 | ||
225 | __raw_writel(clksrc, S3C2412_CLKSRC); | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static struct clk clk_msysclk = { | |
230 | .name = "msysclk", | |
231 | .id = -1, | |
b3bf41be BD |
232 | .ops = &(struct clk_ops) { |
233 | .set_parent = s3c2412_setparent_msysclk, | |
234 | }, | |
736855f0 BD |
235 | }; |
236 | ||
bdbea34d BD |
237 | static int s3c2412_setparent_armclk(struct clk *clk, struct clk *parent) |
238 | { | |
239 | unsigned long flags; | |
240 | unsigned long clkdiv; | |
241 | unsigned long dvs; | |
242 | ||
243 | /* Note, we current equate fclk andf msysclk for S3C2412 */ | |
244 | ||
245 | if (parent == &clk_msysclk || parent == &clk_f) | |
246 | dvs = 0; | |
247 | else if (parent == &clk_h) | |
248 | dvs = S3C2412_CLKDIVN_DVSEN; | |
249 | else | |
250 | return -EINVAL; | |
251 | ||
252 | clk->parent = parent; | |
253 | ||
254 | /* update this under irq lockdown, clkdivn is not protected | |
255 | * by the clock system. */ | |
256 | ||
257 | local_irq_save(flags); | |
258 | ||
259 | clkdiv = __raw_readl(S3C2410_CLKDIVN); | |
260 | clkdiv &= ~S3C2412_CLKDIVN_DVSEN; | |
261 | clkdiv |= dvs; | |
262 | __raw_writel(clkdiv, S3C2410_CLKDIVN); | |
263 | ||
264 | local_irq_restore(flags); | |
265 | ||
266 | return 0; | |
267 | } | |
268 | ||
269 | static struct clk clk_armclk = { | |
270 | .name = "armclk", | |
271 | .id = -1, | |
272 | .parent = &clk_msysclk, | |
b3bf41be BD |
273 | .ops = &(struct clk_ops) { |
274 | .set_parent = s3c2412_setparent_armclk, | |
275 | }, | |
bdbea34d BD |
276 | }; |
277 | ||
736855f0 BD |
278 | /* these next clocks have an divider immediately after them, |
279 | * so we can register them with their divider and leave out the | |
280 | * intermediate clock stage | |
281 | */ | |
282 | static unsigned long s3c2412_roundrate_clksrc(struct clk *clk, | |
283 | unsigned long rate) | |
284 | { | |
285 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
286 | int div; | |
287 | ||
288 | if (rate > parent_rate) | |
289 | return parent_rate; | |
290 | ||
291 | /* note, we remove the +/- 1 calculations as they cancel out */ | |
292 | ||
293 | div = (rate / parent_rate); | |
294 | ||
295 | if (div < 1) | |
296 | div = 1; | |
297 | else if (div > 16) | |
298 | div = 16; | |
299 | ||
300 | return parent_rate / div; | |
301 | } | |
302 | ||
303 | static int s3c2412_setparent_uart(struct clk *clk, struct clk *parent) | |
304 | { | |
305 | unsigned long clksrc = __raw_readl(S3C2412_CLKSRC); | |
306 | ||
307 | if (parent == &clk_erefclk) | |
308 | clksrc &= ~S3C2412_CLKSRC_UARTCLK_MPLL; | |
309 | else if (parent == &clk_mpll) | |
310 | clksrc |= S3C2412_CLKSRC_UARTCLK_MPLL; | |
311 | else | |
312 | return -EINVAL; | |
313 | ||
314 | clk->parent = parent; | |
315 | ||
316 | __raw_writel(clksrc, S3C2412_CLKSRC); | |
317 | return 0; | |
318 | } | |
319 | ||
320 | static unsigned long s3c2412_getrate_uart(struct clk *clk) | |
321 | { | |
322 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
323 | unsigned long div = __raw_readl(S3C2410_CLKDIVN); | |
324 | ||
325 | div &= S3C2412_CLKDIVN_UARTDIV_MASK; | |
326 | div >>= S3C2412_CLKDIVN_UARTDIV_SHIFT; | |
327 | ||
328 | return parent_rate / (div + 1); | |
329 | } | |
330 | ||
331 | static int s3c2412_setrate_uart(struct clk *clk, unsigned long rate) | |
332 | { | |
333 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
334 | unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN); | |
335 | ||
336 | rate = s3c2412_roundrate_clksrc(clk, rate); | |
337 | ||
338 | clkdivn &= ~S3C2412_CLKDIVN_UARTDIV_MASK; | |
339 | clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_UARTDIV_SHIFT; | |
340 | ||
341 | __raw_writel(clkdivn, S3C2410_CLKDIVN); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | static struct clk clk_uart = { | |
346 | .name = "uartclk", | |
347 | .id = -1, | |
b3bf41be BD |
348 | .ops = &(struct clk_ops) { |
349 | .get_rate = s3c2412_getrate_uart, | |
350 | .set_rate = s3c2412_setrate_uart, | |
351 | .set_parent = s3c2412_setparent_uart, | |
352 | .round_rate = s3c2412_roundrate_clksrc, | |
353 | }, | |
736855f0 BD |
354 | }; |
355 | ||
356 | static int s3c2412_setparent_i2s(struct clk *clk, struct clk *parent) | |
357 | { | |
358 | unsigned long clksrc = __raw_readl(S3C2412_CLKSRC); | |
359 | ||
360 | if (parent == &clk_erefclk) | |
361 | clksrc &= ~S3C2412_CLKSRC_I2SCLK_MPLL; | |
362 | else if (parent == &clk_mpll) | |
363 | clksrc |= S3C2412_CLKSRC_I2SCLK_MPLL; | |
364 | else | |
365 | return -EINVAL; | |
366 | ||
367 | clk->parent = parent; | |
368 | ||
369 | __raw_writel(clksrc, S3C2412_CLKSRC); | |
370 | return 0; | |
371 | } | |
372 | ||
373 | static unsigned long s3c2412_getrate_i2s(struct clk *clk) | |
374 | { | |
375 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
376 | unsigned long div = __raw_readl(S3C2410_CLKDIVN); | |
377 | ||
378 | div &= S3C2412_CLKDIVN_I2SDIV_MASK; | |
379 | div >>= S3C2412_CLKDIVN_I2SDIV_SHIFT; | |
380 | ||
381 | return parent_rate / (div + 1); | |
382 | } | |
383 | ||
384 | static int s3c2412_setrate_i2s(struct clk *clk, unsigned long rate) | |
385 | { | |
386 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
387 | unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN); | |
388 | ||
389 | rate = s3c2412_roundrate_clksrc(clk, rate); | |
390 | ||
391 | clkdivn &= ~S3C2412_CLKDIVN_I2SDIV_MASK; | |
392 | clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_I2SDIV_SHIFT; | |
393 | ||
394 | __raw_writel(clkdivn, S3C2410_CLKDIVN); | |
395 | return 0; | |
396 | } | |
397 | ||
398 | static struct clk clk_i2s = { | |
399 | .name = "i2sclk", | |
400 | .id = -1, | |
b3bf41be BD |
401 | .ops = &(struct clk_ops) { |
402 | .get_rate = s3c2412_getrate_i2s, | |
403 | .set_rate = s3c2412_setrate_i2s, | |
404 | .set_parent = s3c2412_setparent_i2s, | |
405 | .round_rate = s3c2412_roundrate_clksrc, | |
406 | }, | |
736855f0 BD |
407 | }; |
408 | ||
409 | static int s3c2412_setparent_cam(struct clk *clk, struct clk *parent) | |
410 | { | |
411 | unsigned long clksrc = __raw_readl(S3C2412_CLKSRC); | |
412 | ||
413 | if (parent == &clk_usysclk) | |
414 | clksrc &= ~S3C2412_CLKSRC_CAMCLK_HCLK; | |
415 | else if (parent == &clk_h) | |
416 | clksrc |= S3C2412_CLKSRC_CAMCLK_HCLK; | |
417 | else | |
418 | return -EINVAL; | |
419 | ||
420 | clk->parent = parent; | |
421 | ||
422 | __raw_writel(clksrc, S3C2412_CLKSRC); | |
423 | return 0; | |
424 | } | |
425 | static unsigned long s3c2412_getrate_cam(struct clk *clk) | |
426 | { | |
427 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
428 | unsigned long div = __raw_readl(S3C2410_CLKDIVN); | |
429 | ||
430 | div &= S3C2412_CLKDIVN_CAMDIV_MASK; | |
431 | div >>= S3C2412_CLKDIVN_CAMDIV_SHIFT; | |
432 | ||
433 | return parent_rate / (div + 1); | |
434 | } | |
435 | ||
436 | static int s3c2412_setrate_cam(struct clk *clk, unsigned long rate) | |
437 | { | |
438 | unsigned long parent_rate = clk_get_rate(clk->parent); | |
439 | unsigned long clkdivn = __raw_readl(S3C2410_CLKDIVN); | |
440 | ||
441 | rate = s3c2412_roundrate_clksrc(clk, rate); | |
442 | ||
443 | clkdivn &= ~S3C2412_CLKDIVN_CAMDIV_MASK; | |
444 | clkdivn |= ((parent_rate / rate) - 1) << S3C2412_CLKDIVN_CAMDIV_SHIFT; | |
445 | ||
446 | __raw_writel(clkdivn, S3C2410_CLKDIVN); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static struct clk clk_cam = { | |
451 | .name = "camif-upll", /* same as 2440 name */ | |
452 | .id = -1, | |
b3bf41be BD |
453 | .ops = &(struct clk_ops) { |
454 | .get_rate = s3c2412_getrate_cam, | |
455 | .set_rate = s3c2412_setrate_cam, | |
456 | .set_parent = s3c2412_setparent_cam, | |
457 | .round_rate = s3c2412_roundrate_clksrc, | |
458 | }, | |
736855f0 BD |
459 | }; |
460 | ||
461 | /* standard clock definitions */ | |
462 | ||
463 | static struct clk init_clocks_disable[] = { | |
464 | { | |
465 | .name = "nand", | |
466 | .id = -1, | |
467 | .parent = &clk_h, | |
468 | .enable = s3c2412_clkcon_enable, | |
469 | .ctrlbit = S3C2412_CLKCON_NAND, | |
470 | }, { | |
471 | .name = "sdi", | |
472 | .id = -1, | |
473 | .parent = &clk_p, | |
474 | .enable = s3c2412_clkcon_enable, | |
475 | .ctrlbit = S3C2412_CLKCON_SDI, | |
476 | }, { | |
477 | .name = "adc", | |
478 | .id = -1, | |
479 | .parent = &clk_p, | |
480 | .enable = s3c2412_clkcon_enable, | |
481 | .ctrlbit = S3C2412_CLKCON_ADC, | |
482 | }, { | |
483 | .name = "i2c", | |
484 | .id = -1, | |
485 | .parent = &clk_p, | |
486 | .enable = s3c2412_clkcon_enable, | |
487 | .ctrlbit = S3C2412_CLKCON_IIC, | |
488 | }, { | |
489 | .name = "iis", | |
490 | .id = -1, | |
491 | .parent = &clk_p, | |
492 | .enable = s3c2412_clkcon_enable, | |
493 | .ctrlbit = S3C2412_CLKCON_IIS, | |
494 | }, { | |
495 | .name = "spi", | |
496 | .id = -1, | |
497 | .parent = &clk_p, | |
498 | .enable = s3c2412_clkcon_enable, | |
499 | .ctrlbit = S3C2412_CLKCON_SPI, | |
500 | } | |
501 | }; | |
502 | ||
503 | static struct clk init_clocks[] = { | |
504 | { | |
505 | .name = "dma", | |
506 | .id = 0, | |
507 | .parent = &clk_h, | |
508 | .enable = s3c2412_clkcon_enable, | |
509 | .ctrlbit = S3C2412_CLKCON_DMA0, | |
510 | }, { | |
511 | .name = "dma", | |
512 | .id = 1, | |
513 | .parent = &clk_h, | |
514 | .enable = s3c2412_clkcon_enable, | |
515 | .ctrlbit = S3C2412_CLKCON_DMA1, | |
516 | }, { | |
517 | .name = "dma", | |
518 | .id = 2, | |
519 | .parent = &clk_h, | |
520 | .enable = s3c2412_clkcon_enable, | |
521 | .ctrlbit = S3C2412_CLKCON_DMA2, | |
522 | }, { | |
523 | .name = "dma", | |
524 | .id = 3, | |
525 | .parent = &clk_h, | |
526 | .enable = s3c2412_clkcon_enable, | |
527 | .ctrlbit = S3C2412_CLKCON_DMA3, | |
528 | }, { | |
529 | .name = "lcd", | |
530 | .id = -1, | |
531 | .parent = &clk_h, | |
532 | .enable = s3c2412_clkcon_enable, | |
533 | .ctrlbit = S3C2412_CLKCON_LCDC, | |
534 | }, { | |
535 | .name = "gpio", | |
536 | .id = -1, | |
537 | .parent = &clk_p, | |
538 | .enable = s3c2412_clkcon_enable, | |
539 | .ctrlbit = S3C2412_CLKCON_GPIO, | |
540 | }, { | |
541 | .name = "usb-host", | |
542 | .id = -1, | |
543 | .parent = &clk_h, | |
544 | .enable = s3c2412_clkcon_enable, | |
545 | .ctrlbit = S3C2412_CLKCON_USBH, | |
546 | }, { | |
547 | .name = "usb-device", | |
548 | .id = -1, | |
549 | .parent = &clk_h, | |
550 | .enable = s3c2412_clkcon_enable, | |
551 | .ctrlbit = S3C2412_CLKCON_USBD, | |
552 | }, { | |
553 | .name = "timers", | |
554 | .id = -1, | |
555 | .parent = &clk_p, | |
556 | .enable = s3c2412_clkcon_enable, | |
557 | .ctrlbit = S3C2412_CLKCON_PWMT, | |
558 | }, { | |
559 | .name = "uart", | |
560 | .id = 0, | |
561 | .parent = &clk_p, | |
562 | .enable = s3c2412_clkcon_enable, | |
563 | .ctrlbit = S3C2412_CLKCON_UART0, | |
564 | }, { | |
565 | .name = "uart", | |
566 | .id = 1, | |
567 | .parent = &clk_p, | |
568 | .enable = s3c2412_clkcon_enable, | |
569 | .ctrlbit = S3C2412_CLKCON_UART1, | |
570 | }, { | |
571 | .name = "uart", | |
572 | .id = 2, | |
573 | .parent = &clk_p, | |
574 | .enable = s3c2412_clkcon_enable, | |
575 | .ctrlbit = S3C2412_CLKCON_UART2, | |
576 | }, { | |
577 | .name = "rtc", | |
578 | .id = -1, | |
579 | .parent = &clk_p, | |
580 | .enable = s3c2412_clkcon_enable, | |
581 | .ctrlbit = S3C2412_CLKCON_RTC, | |
582 | }, { | |
583 | .name = "watchdog", | |
584 | .id = -1, | |
585 | .parent = &clk_p, | |
586 | .ctrlbit = 0, | |
587 | }, { | |
588 | .name = "usb-bus-gadget", | |
589 | .id = -1, | |
590 | .parent = &clk_usb_bus, | |
591 | .enable = s3c2412_clkcon_enable, | |
592 | .ctrlbit = S3C2412_CLKCON_USB_DEV48, | |
593 | }, { | |
594 | .name = "usb-bus-host", | |
595 | .id = -1, | |
596 | .parent = &clk_usb_bus, | |
597 | .enable = s3c2412_clkcon_enable, | |
598 | .ctrlbit = S3C2412_CLKCON_USB_HOST48, | |
599 | } | |
600 | }; | |
601 | ||
602 | /* clocks to add where we need to check their parentage */ | |
603 | ||
604 | struct clk_init { | |
605 | struct clk *clk; | |
606 | unsigned int bit; | |
607 | struct clk *src_0; | |
608 | struct clk *src_1; | |
609 | }; | |
610 | ||
7ae9e420 | 611 | static struct clk_init clks_src[] __initdata = { |
736855f0 BD |
612 | { |
613 | .clk = &clk_usysclk, | |
614 | .bit = S3C2412_CLKSRC_USBCLK_HCLK, | |
615 | .src_0 = &clk_urefclk, | |
616 | .src_1 = &clk_upll, | |
617 | }, { | |
618 | .clk = &clk_i2s, | |
619 | .bit = S3C2412_CLKSRC_I2SCLK_MPLL, | |
620 | .src_0 = &clk_erefclk, | |
621 | .src_1 = &clk_mpll, | |
622 | }, { | |
623 | .clk = &clk_cam, | |
624 | .bit = S3C2412_CLKSRC_CAMCLK_HCLK, | |
625 | .src_0 = &clk_usysclk, | |
626 | .src_1 = &clk_h, | |
627 | }, { | |
628 | .clk = &clk_msysclk, | |
629 | .bit = S3C2412_CLKSRC_MSYSCLK_MPLL, | |
630 | .src_0 = &clk_mdivclk, | |
631 | .src_1 = &clk_mpll, | |
632 | }, { | |
633 | .clk = &clk_uart, | |
634 | .bit = S3C2412_CLKSRC_UARTCLK_MPLL, | |
635 | .src_0 = &clk_erefclk, | |
636 | .src_1 = &clk_mpll, | |
637 | }, { | |
638 | .clk = &clk_usbsrc, | |
639 | .bit = S3C2412_CLKSRC_USBCLK_HCLK, | |
640 | .src_0 = &clk_usysclk, | |
641 | .src_1 = &clk_h, | |
d5c52922 MC |
642 | /* here we assume OM[4] select xtal */ |
643 | }, { | |
644 | .clk = &clk_erefclk, | |
645 | .bit = S3C2412_CLKSRC_EREFCLK_EXTCLK, | |
646 | .src_0 = &clk_xtal, | |
647 | .src_1 = &clk_ext, | |
648 | }, { | |
649 | .clk = &clk_urefclk, | |
650 | .bit = S3C2412_CLKSRC_UREFCLK_EXTCLK, | |
651 | .src_0 = &clk_xtal, | |
652 | .src_1 = &clk_ext, | |
736855f0 BD |
653 | }, |
654 | }; | |
655 | ||
656 | /* s3c2412_clk_initparents | |
657 | * | |
658 | * Initialise the parents for the clocks that we get at start-time | |
659 | */ | |
660 | ||
661 | static void __init s3c2412_clk_initparents(void) | |
662 | { | |
663 | unsigned long clksrc = __raw_readl(S3C2412_CLKSRC); | |
664 | struct clk_init *cip = clks_src; | |
665 | struct clk *src; | |
666 | int ptr; | |
667 | int ret; | |
668 | ||
669 | for (ptr = 0; ptr < ARRAY_SIZE(clks_src); ptr++, cip++) { | |
670 | ret = s3c24xx_register_clock(cip->clk); | |
671 | if (ret < 0) { | |
672 | printk(KERN_ERR "Failed to register clock %s (%d)\n", | |
673 | cip->clk->name, ret); | |
674 | } | |
675 | ||
676 | src = (clksrc & cip->bit) ? cip->src_1 : cip->src_0; | |
677 | ||
678 | printk(KERN_INFO "%s: parent %s\n", cip->clk->name, src->name); | |
679 | clk_set_parent(cip->clk, src); | |
680 | } | |
681 | } | |
682 | ||
683 | /* clocks to add straight away */ | |
684 | ||
7ae9e420 | 685 | static struct clk *clks[] __initdata = { |
736855f0 BD |
686 | &clk_ext, |
687 | &clk_usb_bus, | |
736855f0 | 688 | &clk_mrefclk, |
bdbea34d | 689 | &clk_armclk, |
736855f0 BD |
690 | }; |
691 | ||
692 | int __init s3c2412_baseclk_add(void) | |
693 | { | |
694 | unsigned long clkcon = __raw_readl(S3C2410_CLKCON); | |
bdbea34d | 695 | unsigned int dvs; |
736855f0 BD |
696 | struct clk *clkp; |
697 | int ret; | |
698 | int ptr; | |
699 | ||
700 | clk_upll.enable = s3c2412_upll_enable; | |
701 | clk_usb_bus.parent = &clk_usbsrc; | |
702 | clk_usb_bus.rate = 0x0; | |
703 | ||
ddd870bd BD |
704 | clk_f.parent = &clk_msysclk; |
705 | ||
736855f0 BD |
706 | s3c2412_clk_initparents(); |
707 | ||
708 | for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) { | |
709 | clkp = clks[ptr]; | |
710 | ||
711 | ret = s3c24xx_register_clock(clkp); | |
712 | if (ret < 0) { | |
713 | printk(KERN_ERR "Failed to register clock %s (%d)\n", | |
714 | clkp->name, ret); | |
715 | } | |
716 | } | |
717 | ||
bdbea34d BD |
718 | /* set the dvs state according to what we got at boot time */ |
719 | ||
720 | dvs = __raw_readl(S3C2410_CLKDIVN) & S3C2412_CLKDIVN_DVSEN; | |
721 | ||
722 | if (dvs) | |
723 | clk_armclk.parent = &clk_h; | |
724 | ||
725 | printk(KERN_INFO "S3C2412: DVS is %s\n", dvs ? "on" : "off"); | |
726 | ||
736855f0 BD |
727 | /* ensure usb bus clock is within correct rate of 48MHz */ |
728 | ||
729 | if (clk_get_rate(&clk_usb_bus) != (48 * 1000 * 1000)) { | |
730 | printk(KERN_INFO "Warning: USB bus clock not at 48MHz\n"); | |
731 | ||
732 | /* for the moment, let's use the UPLL, and see if we can | |
733 | * get 48MHz */ | |
734 | ||
735 | clk_set_parent(&clk_usysclk, &clk_upll); | |
736 | clk_set_parent(&clk_usbsrc, &clk_usysclk); | |
737 | clk_set_rate(&clk_usbsrc, 48*1000*1000); | |
738 | } | |
739 | ||
740 | printk("S3C2412: upll %s, %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n", | |
741 | (__raw_readl(S3C2410_UPLLCON) & S3C2412_PLLCON_OFF) ? "off":"on", | |
742 | print_mhz(clk_get_rate(&clk_upll)), | |
743 | print_mhz(clk_get_rate(&clk_usb_bus))); | |
744 | ||
745 | /* register clocks from clock array */ | |
746 | ||
747 | clkp = init_clocks; | |
748 | for (ptr = 0; ptr < ARRAY_SIZE(init_clocks); ptr++, clkp++) { | |
749 | /* ensure that we note the clock state */ | |
750 | ||
751 | clkp->usage = clkcon & clkp->ctrlbit ? 1 : 0; | |
752 | ||
753 | ret = s3c24xx_register_clock(clkp); | |
754 | if (ret < 0) { | |
755 | printk(KERN_ERR "Failed to register clock %s (%d)\n", | |
756 | clkp->name, ret); | |
757 | } | |
758 | } | |
759 | ||
760 | /* We must be careful disabling the clocks we are not intending to | |
3a4fa0a2 | 761 | * be using at boot time, as subsystems such as the LCD which do |
736855f0 BD |
762 | * their own DMA requests to the bus can cause the system to lockup |
763 | * if they where in the middle of requesting bus access. | |
764 | * | |
765 | * Disabling the LCD clock if the LCD is active is very dangerous, | |
766 | * and therefore the bootloader should be careful to not enable | |
767 | * the LCD clock if it is not needed. | |
768 | */ | |
769 | ||
770 | /* install (and disable) the clocks we do not need immediately */ | |
771 | ||
772 | clkp = init_clocks_disable; | |
773 | for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) { | |
774 | ||
775 | ret = s3c24xx_register_clock(clkp); | |
776 | if (ret < 0) { | |
777 | printk(KERN_ERR "Failed to register clock %s (%d)\n", | |
778 | clkp->name, ret); | |
779 | } | |
780 | ||
781 | s3c2412_clkcon_enable(clkp, 0); | |
782 | } | |
783 | ||
9d325f23 | 784 | s3c_pwmclk_init(); |
736855f0 BD |
785 | return 0; |
786 | } |