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09ec1d7e | 1 | /* |
e02f8664 | 2 | * Copyright (c) 2006-2008 Simtec Electronics |
2e4ea6e8 BD |
3 | * http://armlinux.simtec.co.uk/ |
4 | * Ben Dooks <ben@simtec.co.uk> | |
5 | * | |
6 | * S3C24XX CPU Frequency scaling | |
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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/init.h> | |
14 | #include <linux/module.h> | |
15 | #include <linux/interrupt.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/cpufreq.h> | |
18 | #include <linux/cpu.h> | |
19 | #include <linux/clk.h> | |
20 | #include <linux/err.h> | |
21 | #include <linux/io.h> | |
edbaa603 | 22 | #include <linux/device.h> |
2e4ea6e8 | 23 | #include <linux/sysfs.h> |
5a0e3ad6 | 24 | #include <linux/slab.h> |
2e4ea6e8 BD |
25 | |
26 | #include <asm/mach/arch.h> | |
27 | #include <asm/mach/map.h> | |
28 | ||
29 | #include <plat/cpu.h> | |
30 | #include <plat/clock.h> | |
31 | #include <plat/cpu-freq-core.h> | |
32 | ||
33 | #include <mach/regs-clock.h> | |
34 | ||
35 | /* note, cpufreq support deals in kHz, no Hz */ | |
36 | ||
37 | static struct cpufreq_driver s3c24xx_driver; | |
38 | static struct s3c_cpufreq_config cpu_cur; | |
39 | static struct s3c_iotimings s3c24xx_iotiming; | |
40 | static struct cpufreq_frequency_table *pll_reg; | |
41 | static unsigned int last_target = ~0; | |
42 | static unsigned int ftab_size; | |
43 | static struct cpufreq_frequency_table *ftab; | |
44 | ||
45 | static struct clk *_clk_mpll; | |
46 | static struct clk *_clk_xtal; | |
47 | static struct clk *clk_fclk; | |
48 | static struct clk *clk_hclk; | |
49 | static struct clk *clk_pclk; | |
50 | static struct clk *clk_arm; | |
51 | ||
e6d197a6 BD |
52 | #ifdef CONFIG_CPU_FREQ_S3C24XX_DEBUGFS |
53 | struct s3c_cpufreq_config *s3c_cpufreq_getconfig(void) | |
54 | { | |
55 | return &cpu_cur; | |
56 | } | |
57 | ||
58 | struct s3c_iotimings *s3c_cpufreq_getiotimings(void) | |
59 | { | |
60 | return &s3c24xx_iotiming; | |
61 | } | |
62 | #endif /* CONFIG_CPU_FREQ_S3C24XX_DEBUGFS */ | |
63 | ||
2e4ea6e8 BD |
64 | static void s3c_cpufreq_getcur(struct s3c_cpufreq_config *cfg) |
65 | { | |
66 | unsigned long fclk, pclk, hclk, armclk; | |
67 | ||
68 | cfg->freq.fclk = fclk = clk_get_rate(clk_fclk); | |
69 | cfg->freq.hclk = hclk = clk_get_rate(clk_hclk); | |
70 | cfg->freq.pclk = pclk = clk_get_rate(clk_pclk); | |
71 | cfg->freq.armclk = armclk = clk_get_rate(clk_arm); | |
72 | ||
73 | cfg->pll.index = __raw_readl(S3C2410_MPLLCON); | |
74 | cfg->pll.frequency = fclk; | |
75 | ||
76 | cfg->freq.hclk_tns = 1000000000 / (cfg->freq.hclk / 10); | |
77 | ||
78 | cfg->divs.h_divisor = fclk / hclk; | |
79 | cfg->divs.p_divisor = fclk / pclk; | |
80 | } | |
81 | ||
82 | static inline void s3c_cpufreq_calc(struct s3c_cpufreq_config *cfg) | |
83 | { | |
84 | unsigned long pll = cfg->pll.frequency; | |
85 | ||
86 | cfg->freq.fclk = pll; | |
87 | cfg->freq.hclk = pll / cfg->divs.h_divisor; | |
88 | cfg->freq.pclk = pll / cfg->divs.p_divisor; | |
89 | ||
90 | /* convert hclk into 10ths of nanoseconds for io calcs */ | |
91 | cfg->freq.hclk_tns = 1000000000 / (cfg->freq.hclk / 10); | |
92 | } | |
93 | ||
94 | static inline int closer(unsigned int target, unsigned int n, unsigned int c) | |
95 | { | |
96 | int diff_cur = abs(target - c); | |
97 | int diff_new = abs(target - n); | |
98 | ||
99 | return (diff_new < diff_cur); | |
100 | } | |
101 | ||
102 | static void s3c_cpufreq_show(const char *pfx, | |
103 | struct s3c_cpufreq_config *cfg) | |
104 | { | |
105 | s3c_freq_dbg("%s: Fvco=%u, F=%lu, A=%lu, H=%lu (%u), P=%lu (%u)\n", | |
106 | pfx, cfg->pll.frequency, cfg->freq.fclk, cfg->freq.armclk, | |
107 | cfg->freq.hclk, cfg->divs.h_divisor, | |
108 | cfg->freq.pclk, cfg->divs.p_divisor); | |
109 | } | |
110 | ||
111 | /* functions to wrapper the driver info calls to do the cpu specific work */ | |
112 | ||
113 | static void s3c_cpufreq_setio(struct s3c_cpufreq_config *cfg) | |
114 | { | |
115 | if (cfg->info->set_iotiming) | |
116 | (cfg->info->set_iotiming)(cfg, &s3c24xx_iotiming); | |
117 | } | |
118 | ||
119 | static int s3c_cpufreq_calcio(struct s3c_cpufreq_config *cfg) | |
120 | { | |
121 | if (cfg->info->calc_iotiming) | |
122 | return (cfg->info->calc_iotiming)(cfg, &s3c24xx_iotiming); | |
123 | ||
124 | return 0; | |
125 | } | |
126 | ||
127 | static void s3c_cpufreq_setrefresh(struct s3c_cpufreq_config *cfg) | |
128 | { | |
129 | (cfg->info->set_refresh)(cfg); | |
130 | } | |
131 | ||
132 | static void s3c_cpufreq_setdivs(struct s3c_cpufreq_config *cfg) | |
133 | { | |
134 | (cfg->info->set_divs)(cfg); | |
135 | } | |
136 | ||
137 | static int s3c_cpufreq_calcdivs(struct s3c_cpufreq_config *cfg) | |
138 | { | |
139 | return (cfg->info->calc_divs)(cfg); | |
140 | } | |
141 | ||
142 | static void s3c_cpufreq_setfvco(struct s3c_cpufreq_config *cfg) | |
143 | { | |
144 | (cfg->info->set_fvco)(cfg); | |
145 | } | |
146 | ||
147 | static inline void s3c_cpufreq_resume_clocks(void) | |
148 | { | |
149 | cpu_cur.info->resume_clocks(); | |
150 | } | |
151 | ||
152 | static inline void s3c_cpufreq_updateclk(struct clk *clk, | |
153 | unsigned int freq) | |
154 | { | |
155 | clk_set_rate(clk, freq); | |
156 | } | |
157 | ||
158 | static int s3c_cpufreq_settarget(struct cpufreq_policy *policy, | |
159 | unsigned int target_freq, | |
160 | struct cpufreq_frequency_table *pll) | |
161 | { | |
162 | struct s3c_cpufreq_freqs freqs; | |
163 | struct s3c_cpufreq_config cpu_new; | |
164 | unsigned long flags; | |
165 | ||
166 | cpu_new = cpu_cur; /* copy new from current */ | |
167 | ||
168 | s3c_cpufreq_show("cur", &cpu_cur); | |
169 | ||
170 | /* TODO - check for DMA currently outstanding */ | |
171 | ||
172 | cpu_new.pll = pll ? *pll : cpu_cur.pll; | |
173 | ||
174 | if (pll) | |
175 | freqs.pll_changing = 1; | |
176 | ||
177 | /* update our frequencies */ | |
178 | ||
179 | cpu_new.freq.armclk = target_freq; | |
180 | cpu_new.freq.fclk = cpu_new.pll.frequency; | |
181 | ||
182 | if (s3c_cpufreq_calcdivs(&cpu_new) < 0) { | |
183 | printk(KERN_ERR "no divisors for %d\n", target_freq); | |
184 | goto err_notpossible; | |
185 | } | |
186 | ||
187 | s3c_freq_dbg("%s: got divs\n", __func__); | |
188 | ||
189 | s3c_cpufreq_calc(&cpu_new); | |
190 | ||
191 | s3c_freq_dbg("%s: calculated frequencies for new\n", __func__); | |
192 | ||
193 | if (cpu_new.freq.hclk != cpu_cur.freq.hclk) { | |
194 | if (s3c_cpufreq_calcio(&cpu_new) < 0) { | |
195 | printk(KERN_ERR "%s: no IO timings\n", __func__); | |
196 | goto err_notpossible; | |
197 | } | |
198 | } | |
199 | ||
200 | s3c_cpufreq_show("new", &cpu_new); | |
201 | ||
202 | /* setup our cpufreq parameters */ | |
203 | ||
204 | freqs.old = cpu_cur.freq; | |
205 | freqs.new = cpu_new.freq; | |
206 | ||
207 | freqs.freqs.cpu = 0; | |
208 | freqs.freqs.old = cpu_cur.freq.armclk / 1000; | |
209 | freqs.freqs.new = cpu_new.freq.armclk / 1000; | |
210 | ||
211 | /* update f/h/p clock settings before we issue the change | |
212 | * notification, so that drivers do not need to do anything | |
213 | * special if they want to recalculate on CPUFREQ_PRECHANGE. */ | |
214 | ||
215 | s3c_cpufreq_updateclk(_clk_mpll, cpu_new.pll.frequency); | |
216 | s3c_cpufreq_updateclk(clk_fclk, cpu_new.freq.fclk); | |
217 | s3c_cpufreq_updateclk(clk_hclk, cpu_new.freq.hclk); | |
218 | s3c_cpufreq_updateclk(clk_pclk, cpu_new.freq.pclk); | |
219 | ||
220 | /* start the frequency change */ | |
221 | ||
222 | if (policy) | |
223 | cpufreq_notify_transition(&freqs.freqs, CPUFREQ_PRECHANGE); | |
224 | ||
225 | /* If hclk is staying the same, then we do not need to | |
226 | * re-write the IO or the refresh timings whilst we are changing | |
227 | * speed. */ | |
228 | ||
229 | local_irq_save(flags); | |
230 | ||
231 | /* is our memory clock slowing down? */ | |
232 | if (cpu_new.freq.hclk < cpu_cur.freq.hclk) { | |
233 | s3c_cpufreq_setrefresh(&cpu_new); | |
234 | s3c_cpufreq_setio(&cpu_new); | |
235 | } | |
236 | ||
237 | if (cpu_new.freq.fclk == cpu_cur.freq.fclk) { | |
238 | /* not changing PLL, just set the divisors */ | |
239 | ||
240 | s3c_cpufreq_setdivs(&cpu_new); | |
241 | } else { | |
242 | if (cpu_new.freq.fclk < cpu_cur.freq.fclk) { | |
243 | /* slow the cpu down, then set divisors */ | |
244 | ||
245 | s3c_cpufreq_setfvco(&cpu_new); | |
246 | s3c_cpufreq_setdivs(&cpu_new); | |
247 | } else { | |
248 | /* set the divisors, then speed up */ | |
249 | ||
250 | s3c_cpufreq_setdivs(&cpu_new); | |
251 | s3c_cpufreq_setfvco(&cpu_new); | |
252 | } | |
253 | } | |
254 | ||
255 | /* did our memory clock speed up */ | |
256 | if (cpu_new.freq.hclk > cpu_cur.freq.hclk) { | |
257 | s3c_cpufreq_setrefresh(&cpu_new); | |
258 | s3c_cpufreq_setio(&cpu_new); | |
259 | } | |
260 | ||
261 | /* update our current settings */ | |
262 | cpu_cur = cpu_new; | |
263 | ||
264 | local_irq_restore(flags); | |
265 | ||
266 | /* notify everyone we've done this */ | |
267 | if (policy) | |
268 | cpufreq_notify_transition(&freqs.freqs, CPUFREQ_POSTCHANGE); | |
269 | ||
270 | s3c_freq_dbg("%s: finished\n", __func__); | |
271 | return 0; | |
272 | ||
273 | err_notpossible: | |
274 | printk(KERN_ERR "no compatible settings for %d\n", target_freq); | |
275 | return -EINVAL; | |
276 | } | |
277 | ||
278 | /* s3c_cpufreq_target | |
279 | * | |
280 | * called by the cpufreq core to adjust the frequency that the CPU | |
281 | * is currently running at. | |
282 | */ | |
283 | ||
284 | static int s3c_cpufreq_target(struct cpufreq_policy *policy, | |
285 | unsigned int target_freq, | |
286 | unsigned int relation) | |
287 | { | |
288 | struct cpufreq_frequency_table *pll; | |
289 | unsigned int index; | |
290 | ||
291 | /* avoid repeated calls which cause a needless amout of duplicated | |
292 | * logging output (and CPU time as the calculation process is | |
293 | * done) */ | |
294 | if (target_freq == last_target) | |
295 | return 0; | |
296 | ||
297 | last_target = target_freq; | |
298 | ||
299 | s3c_freq_dbg("%s: policy %p, target %u, relation %u\n", | |
300 | __func__, policy, target_freq, relation); | |
301 | ||
302 | if (ftab) { | |
303 | if (cpufreq_frequency_table_target(policy, ftab, | |
304 | target_freq, relation, | |
305 | &index)) { | |
306 | s3c_freq_dbg("%s: table failed\n", __func__); | |
307 | return -EINVAL; | |
308 | } | |
309 | ||
310 | s3c_freq_dbg("%s: adjust %d to entry %d (%u)\n", __func__, | |
311 | target_freq, index, ftab[index].frequency); | |
312 | target_freq = ftab[index].frequency; | |
313 | } | |
314 | ||
315 | target_freq *= 1000; /* convert target to Hz */ | |
316 | ||
317 | /* find the settings for our new frequency */ | |
318 | ||
319 | if (!pll_reg || cpu_cur.lock_pll) { | |
320 | /* either we've not got any PLL values, or we've locked | |
321 | * to the current one. */ | |
322 | pll = NULL; | |
323 | } else { | |
324 | struct cpufreq_policy tmp_policy; | |
325 | int ret; | |
326 | ||
327 | /* we keep the cpu pll table in Hz, to ensure we get an | |
328 | * accurate value for the PLL output. */ | |
329 | ||
330 | tmp_policy.min = policy->min * 1000; | |
331 | tmp_policy.max = policy->max * 1000; | |
332 | tmp_policy.cpu = policy->cpu; | |
333 | ||
334 | /* cpufreq_frequency_table_target uses a pointer to 'index' | |
335 | * which is the number of the table entry, not the value of | |
336 | * the table entry's index field. */ | |
337 | ||
338 | ret = cpufreq_frequency_table_target(&tmp_policy, pll_reg, | |
339 | target_freq, relation, | |
340 | &index); | |
341 | ||
342 | if (ret < 0) { | |
343 | printk(KERN_ERR "%s: no PLL available\n", __func__); | |
344 | goto err_notpossible; | |
345 | } | |
346 | ||
347 | pll = pll_reg + index; | |
348 | ||
349 | s3c_freq_dbg("%s: target %u => %u\n", | |
350 | __func__, target_freq, pll->frequency); | |
351 | ||
352 | target_freq = pll->frequency; | |
353 | } | |
354 | ||
355 | return s3c_cpufreq_settarget(policy, target_freq, pll); | |
356 | ||
357 | err_notpossible: | |
358 | printk(KERN_ERR "no compatible settings for %d\n", target_freq); | |
359 | return -EINVAL; | |
360 | } | |
361 | ||
362 | static unsigned int s3c_cpufreq_get(unsigned int cpu) | |
363 | { | |
364 | return clk_get_rate(clk_arm) / 1000; | |
365 | } | |
366 | ||
367 | struct clk *s3c_cpufreq_clk_get(struct device *dev, const char *name) | |
368 | { | |
369 | struct clk *clk; | |
370 | ||
371 | clk = clk_get(dev, name); | |
372 | if (IS_ERR(clk)) | |
373 | printk(KERN_ERR "cpufreq: failed to get clock '%s'\n", name); | |
374 | ||
375 | return clk; | |
376 | } | |
377 | ||
378 | static int s3c_cpufreq_init(struct cpufreq_policy *policy) | |
379 | { | |
380 | printk(KERN_INFO "%s: initialising policy %p\n", __func__, policy); | |
381 | ||
382 | if (policy->cpu != 0) | |
383 | return -EINVAL; | |
384 | ||
385 | policy->cur = s3c_cpufreq_get(0); | |
386 | policy->min = policy->cpuinfo.min_freq = 0; | |
387 | policy->max = policy->cpuinfo.max_freq = cpu_cur.info->max.fclk / 1000; | |
388 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; | |
389 | ||
390 | /* feed the latency information from the cpu driver */ | |
391 | policy->cpuinfo.transition_latency = cpu_cur.info->latency; | |
392 | ||
393 | if (ftab) | |
394 | cpufreq_frequency_table_cpuinfo(policy, ftab); | |
395 | ||
396 | return 0; | |
397 | } | |
398 | ||
399 | static __init int s3c_cpufreq_initclks(void) | |
400 | { | |
401 | _clk_mpll = s3c_cpufreq_clk_get(NULL, "mpll"); | |
402 | _clk_xtal = s3c_cpufreq_clk_get(NULL, "xtal"); | |
403 | clk_fclk = s3c_cpufreq_clk_get(NULL, "fclk"); | |
404 | clk_hclk = s3c_cpufreq_clk_get(NULL, "hclk"); | |
405 | clk_pclk = s3c_cpufreq_clk_get(NULL, "pclk"); | |
406 | clk_arm = s3c_cpufreq_clk_get(NULL, "armclk"); | |
407 | ||
408 | if (IS_ERR(clk_fclk) || IS_ERR(clk_hclk) || IS_ERR(clk_pclk) || | |
409 | IS_ERR(_clk_mpll) || IS_ERR(clk_arm) || IS_ERR(_clk_xtal)) { | |
410 | printk(KERN_ERR "%s: could not get clock(s)\n", __func__); | |
411 | return -ENOENT; | |
412 | } | |
413 | ||
414 | printk(KERN_INFO "%s: clocks f=%lu,h=%lu,p=%lu,a=%lu\n", __func__, | |
415 | clk_get_rate(clk_fclk) / 1000, | |
416 | clk_get_rate(clk_hclk) / 1000, | |
417 | clk_get_rate(clk_pclk) / 1000, | |
418 | clk_get_rate(clk_arm) / 1000); | |
419 | ||
420 | return 0; | |
421 | } | |
422 | ||
423 | static int s3c_cpufreq_verify(struct cpufreq_policy *policy) | |
424 | { | |
425 | if (policy->cpu != 0) | |
426 | return -EINVAL; | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | #ifdef CONFIG_PM | |
432 | static struct cpufreq_frequency_table suspend_pll; | |
433 | static unsigned int suspend_freq; | |
434 | ||
7ca64e2d | 435 | static int s3c_cpufreq_suspend(struct cpufreq_policy *policy) |
2e4ea6e8 BD |
436 | { |
437 | suspend_pll.frequency = clk_get_rate(_clk_mpll); | |
438 | suspend_pll.index = __raw_readl(S3C2410_MPLLCON); | |
439 | suspend_freq = s3c_cpufreq_get(0) * 1000; | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static int s3c_cpufreq_resume(struct cpufreq_policy *policy) | |
445 | { | |
446 | int ret; | |
447 | ||
448 | s3c_freq_dbg("%s: resuming with policy %p\n", __func__, policy); | |
449 | ||
450 | last_target = ~0; /* invalidate last_target setting */ | |
451 | ||
452 | /* first, find out what speed we resumed at. */ | |
453 | s3c_cpufreq_resume_clocks(); | |
454 | ||
455 | /* whilst we will be called later on, we try and re-set the | |
456 | * cpu frequencies as soon as possible so that we do not end | |
25985edc | 457 | * up resuming devices and then immediately having to re-set |
2e4ea6e8 BD |
458 | * a number of settings once these devices have restarted. |
459 | * | |
460 | * as a note, it is expected devices are not used until they | |
461 | * have been un-suspended and at that time they should have | |
462 | * used the updated clock settings. | |
463 | */ | |
464 | ||
465 | ret = s3c_cpufreq_settarget(NULL, suspend_freq, &suspend_pll); | |
466 | if (ret) { | |
467 | printk(KERN_ERR "%s: failed to reset pll/freq\n", __func__); | |
468 | return ret; | |
469 | } | |
470 | ||
471 | return 0; | |
472 | } | |
473 | #else | |
474 | #define s3c_cpufreq_resume NULL | |
475 | #define s3c_cpufreq_suspend NULL | |
476 | #endif | |
477 | ||
478 | static struct cpufreq_driver s3c24xx_driver = { | |
479 | .flags = CPUFREQ_STICKY, | |
480 | .verify = s3c_cpufreq_verify, | |
481 | .target = s3c_cpufreq_target, | |
482 | .get = s3c_cpufreq_get, | |
483 | .init = s3c_cpufreq_init, | |
484 | .suspend = s3c_cpufreq_suspend, | |
485 | .resume = s3c_cpufreq_resume, | |
486 | .name = "s3c24xx", | |
487 | }; | |
488 | ||
489 | ||
490 | int __init s3c_cpufreq_register(struct s3c_cpufreq_info *info) | |
491 | { | |
492 | if (!info || !info->name) { | |
493 | printk(KERN_ERR "%s: failed to pass valid information\n", | |
494 | __func__); | |
495 | return -EINVAL; | |
496 | } | |
497 | ||
498 | printk(KERN_INFO "S3C24XX CPU Frequency driver, %s cpu support\n", | |
499 | info->name); | |
500 | ||
501 | /* check our driver info has valid data */ | |
502 | ||
503 | BUG_ON(info->set_refresh == NULL); | |
504 | BUG_ON(info->set_divs == NULL); | |
505 | BUG_ON(info->calc_divs == NULL); | |
506 | ||
507 | /* info->set_fvco is optional, depending on whether there | |
508 | * is a need to set the clock code. */ | |
509 | ||
510 | cpu_cur.info = info; | |
511 | ||
512 | /* Note, driver registering should probably update locktime */ | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | int __init s3c_cpufreq_setboard(struct s3c_cpufreq_board *board) | |
518 | { | |
519 | struct s3c_cpufreq_board *ours; | |
520 | ||
521 | if (!board) { | |
522 | printk(KERN_INFO "%s: no board data\n", __func__); | |
523 | return -EINVAL; | |
524 | } | |
525 | ||
526 | /* Copy the board information so that each board can make this | |
527 | * initdata. */ | |
528 | ||
529 | ours = kzalloc(sizeof(struct s3c_cpufreq_board), GFP_KERNEL); | |
530 | if (ours == NULL) { | |
531 | printk(KERN_ERR "%s: no memory\n", __func__); | |
532 | return -ENOMEM; | |
533 | } | |
534 | ||
535 | *ours = *board; | |
536 | cpu_cur.board = ours; | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | int __init s3c_cpufreq_auto_io(void) | |
542 | { | |
543 | int ret; | |
544 | ||
545 | if (!cpu_cur.info->get_iotiming) { | |
546 | printk(KERN_ERR "%s: get_iotiming undefined\n", __func__); | |
547 | return -ENOENT; | |
548 | } | |
549 | ||
550 | printk(KERN_INFO "%s: working out IO settings\n", __func__); | |
551 | ||
552 | ret = (cpu_cur.info->get_iotiming)(&cpu_cur, &s3c24xx_iotiming); | |
553 | if (ret) | |
554 | printk(KERN_ERR "%s: failed to get timings\n", __func__); | |
555 | ||
556 | return ret; | |
557 | } | |
558 | ||
559 | /* if one or is zero, then return the other, otherwise return the min */ | |
560 | #define do_min(_a, _b) ((_a) == 0 ? (_b) : (_b) == 0 ? (_a) : min(_a, _b)) | |
561 | ||
562 | /** | |
563 | * s3c_cpufreq_freq_min - find the minimum settings for the given freq. | |
564 | * @dst: The destination structure | |
565 | * @a: One argument. | |
566 | * @b: The other argument. | |
567 | * | |
568 | * Create a minimum of each frequency entry in the 'struct s3c_freq', | |
569 | * unless the entry is zero when it is ignored and the non-zero argument | |
570 | * used. | |
571 | */ | |
572 | static void s3c_cpufreq_freq_min(struct s3c_freq *dst, | |
573 | struct s3c_freq *a, struct s3c_freq *b) | |
574 | { | |
575 | dst->fclk = do_min(a->fclk, b->fclk); | |
576 | dst->hclk = do_min(a->hclk, b->hclk); | |
577 | dst->pclk = do_min(a->pclk, b->pclk); | |
578 | dst->armclk = do_min(a->armclk, b->armclk); | |
579 | } | |
580 | ||
581 | static inline u32 calc_locktime(u32 freq, u32 time_us) | |
582 | { | |
583 | u32 result; | |
584 | ||
585 | result = freq * time_us; | |
586 | result = DIV_ROUND_UP(result, 1000 * 1000); | |
587 | ||
588 | return result; | |
589 | } | |
590 | ||
591 | static void s3c_cpufreq_update_loctkime(void) | |
592 | { | |
593 | unsigned int bits = cpu_cur.info->locktime_bits; | |
594 | u32 rate = (u32)clk_get_rate(_clk_xtal); | |
595 | u32 val; | |
596 | ||
597 | if (bits == 0) { | |
598 | WARN_ON(1); | |
599 | return; | |
600 | } | |
601 | ||
602 | val = calc_locktime(rate, cpu_cur.info->locktime_u) << bits; | |
603 | val |= calc_locktime(rate, cpu_cur.info->locktime_m); | |
604 | ||
605 | printk(KERN_INFO "%s: new locktime is 0x%08x\n", __func__, val); | |
606 | __raw_writel(val, S3C2410_LOCKTIME); | |
607 | } | |
608 | ||
609 | static int s3c_cpufreq_build_freq(void) | |
610 | { | |
611 | int size, ret; | |
612 | ||
613 | if (!cpu_cur.info->calc_freqtable) | |
614 | return -EINVAL; | |
615 | ||
616 | kfree(ftab); | |
617 | ftab = NULL; | |
618 | ||
619 | size = cpu_cur.info->calc_freqtable(&cpu_cur, NULL, 0); | |
620 | size++; | |
621 | ||
622 | ftab = kmalloc(sizeof(struct cpufreq_frequency_table) * size, GFP_KERNEL); | |
623 | if (!ftab) { | |
624 | printk(KERN_ERR "%s: no memory for tables\n", __func__); | |
625 | return -ENOMEM; | |
626 | } | |
627 | ||
628 | ftab_size = size; | |
629 | ||
630 | ret = cpu_cur.info->calc_freqtable(&cpu_cur, ftab, size); | |
631 | s3c_cpufreq_addfreq(ftab, ret, size, CPUFREQ_TABLE_END); | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | static int __init s3c_cpufreq_initcall(void) | |
637 | { | |
638 | int ret = 0; | |
639 | ||
640 | if (cpu_cur.info && cpu_cur.board) { | |
641 | ret = s3c_cpufreq_initclks(); | |
642 | if (ret) | |
643 | goto out; | |
644 | ||
645 | /* get current settings */ | |
646 | s3c_cpufreq_getcur(&cpu_cur); | |
647 | s3c_cpufreq_show("cur", &cpu_cur); | |
648 | ||
649 | if (cpu_cur.board->auto_io) { | |
650 | ret = s3c_cpufreq_auto_io(); | |
651 | if (ret) { | |
652 | printk(KERN_ERR "%s: failed to get io timing\n", | |
653 | __func__); | |
654 | goto out; | |
655 | } | |
656 | } | |
657 | ||
658 | if (cpu_cur.board->need_io && !cpu_cur.info->set_iotiming) { | |
659 | printk(KERN_ERR "%s: no IO support registered\n", | |
660 | __func__); | |
661 | ret = -EINVAL; | |
662 | goto out; | |
663 | } | |
664 | ||
665 | if (!cpu_cur.info->need_pll) | |
666 | cpu_cur.lock_pll = 1; | |
667 | ||
668 | s3c_cpufreq_update_loctkime(); | |
669 | ||
670 | s3c_cpufreq_freq_min(&cpu_cur.max, &cpu_cur.board->max, | |
671 | &cpu_cur.info->max); | |
672 | ||
673 | if (cpu_cur.info->calc_freqtable) | |
674 | s3c_cpufreq_build_freq(); | |
675 | ||
676 | ret = cpufreq_register_driver(&s3c24xx_driver); | |
677 | } | |
678 | ||
679 | out: | |
680 | return ret; | |
681 | } | |
682 | ||
683 | late_initcall(s3c_cpufreq_initcall); | |
684 | ||
685 | /** | |
686 | * s3c_plltab_register - register CPU PLL table. | |
687 | * @plls: The list of PLL entries. | |
688 | * @plls_no: The size of the PLL entries @plls. | |
689 | * | |
690 | * Register the given set of PLLs with the system. | |
691 | */ | |
692 | int __init s3c_plltab_register(struct cpufreq_frequency_table *plls, | |
693 | unsigned int plls_no) | |
694 | { | |
695 | struct cpufreq_frequency_table *vals; | |
696 | unsigned int size; | |
697 | ||
698 | size = sizeof(struct cpufreq_frequency_table) * (plls_no + 1); | |
699 | ||
700 | vals = kmalloc(size, GFP_KERNEL); | |
701 | if (vals) { | |
702 | memcpy(vals, plls, size); | |
703 | pll_reg = vals; | |
704 | ||
705 | /* write a terminating entry, we don't store it in the | |
706 | * table that is stored in the kernel */ | |
707 | vals += plls_no; | |
708 | vals->frequency = CPUFREQ_TABLE_END; | |
709 | ||
710 | printk(KERN_INFO "cpufreq: %d PLL entries\n", plls_no); | |
711 | } else | |
712 | printk(KERN_ERR "cpufreq: no memory for PLL tables\n"); | |
713 | ||
714 | return vals ? 0 : -ENOMEM; | |
715 | } |