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1da177e4 LT |
1 | /* |
2 | * FR-V Power Management Routines | |
3 | * | |
4 | * Copyright (c) 2004 Red Hat, Inc. | |
5 | * | |
6 | * Based on SA1100 version: | |
7 | * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/pm.h> | |
17 | #include <linux/sched.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/delay.h> | |
22 | #include <asm/uaccess.h> | |
23 | ||
24 | #include <asm/mb86943a.h> | |
25 | ||
26 | #include "local.h" | |
27 | ||
28 | void (*pm_power_off)(void); | |
29 | ||
30 | extern void frv_change_cmode(int); | |
31 | ||
32 | /* | |
33 | * Debug macros | |
34 | */ | |
35 | #define DEBUG | |
36 | ||
37 | int pm_do_suspend(void) | |
38 | { | |
39 | local_irq_disable(); | |
40 | ||
41 | __set_LEDS(0xb1); | |
42 | ||
43 | /* go zzz */ | |
44 | frv_cpu_suspend(pdm_suspend_mode); | |
45 | ||
46 | __set_LEDS(0xb2); | |
47 | ||
48 | local_irq_enable(); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static unsigned long __irq_mask; | |
54 | ||
55 | /* | |
56 | * Setup interrupt masks, etc to enable wakeup by power switch | |
57 | */ | |
58 | static void __default_power_switch_setup(void) | |
59 | { | |
60 | /* default is to mask all interrupt sources. */ | |
61 | __irq_mask = *(unsigned long *)0xfeff9820; | |
62 | *(unsigned long *)0xfeff9820 = 0xfffe0000; | |
63 | } | |
64 | ||
65 | /* | |
66 | * Cleanup interrupt masks, etc after wakeup by power switch | |
67 | */ | |
68 | static void __default_power_switch_cleanup(void) | |
69 | { | |
70 | *(unsigned long *)0xfeff9820 = __irq_mask; | |
71 | } | |
72 | ||
73 | /* | |
74 | * Return non-zero if wakeup irq was caused by power switch | |
75 | */ | |
76 | static int __default_power_switch_check(void) | |
77 | { | |
78 | return 1; | |
79 | } | |
80 | ||
81 | void (*__power_switch_wake_setup)(void) = __default_power_switch_setup; | |
82 | int (*__power_switch_wake_check)(void) = __default_power_switch_check; | |
83 | void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup; | |
84 | ||
85 | int pm_do_bus_sleep(void) | |
86 | { | |
87 | local_irq_disable(); | |
88 | ||
89 | /* | |
90 | * Here is where we need some platform-dependent setup | |
91 | * of the interrupt state so that appropriate wakeup | |
92 | * sources are allowed and all others are masked. | |
93 | */ | |
94 | __power_switch_wake_setup(); | |
95 | ||
96 | __set_LEDS(0xa1); | |
97 | ||
98 | /* go zzz | |
99 | * | |
100 | * This is in a loop in case power switch shares an irq with other | |
101 | * devices. The wake_check() tells us if we need to finish waking | |
102 | * or go back to sleep. | |
103 | */ | |
104 | do { | |
105 | frv_cpu_suspend(HSR0_PDM_BUS_SLEEP); | |
106 | } while (__power_switch_wake_check && !__power_switch_wake_check()); | |
107 | ||
108 | __set_LEDS(0xa2); | |
109 | ||
110 | /* | |
111 | * Here is where we need some platform-dependent restore | |
112 | * of the interrupt state prior to being called. | |
113 | */ | |
114 | __power_switch_wake_cleanup(); | |
115 | ||
116 | local_irq_enable(); | |
117 | ||
118 | return 0; | |
119 | } | |
120 | ||
121 | unsigned long sleep_phys_sp(void *sp) | |
122 | { | |
123 | return virt_to_phys(sp); | |
124 | } | |
125 | ||
126 | #ifdef CONFIG_SYSCTL | |
127 | /* | |
128 | * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6 | |
129 | * when all the PM interfaces exist nicely. | |
130 | */ | |
131 | #define CTL_PM 9899 | |
132 | #define CTL_PM_SUSPEND 1 | |
133 | #define CTL_PM_CMODE 2 | |
134 | #define CTL_PM_P0 4 | |
135 | #define CTL_PM_CM 5 | |
136 | ||
137 | static int user_atoi(char *ubuf, size_t len) | |
138 | { | |
139 | char buf[16]; | |
140 | unsigned long ret; | |
141 | ||
142 | if (len > 15) | |
143 | return -EINVAL; | |
144 | ||
145 | if (copy_from_user(buf, ubuf, len)) | |
146 | return -EFAULT; | |
147 | ||
148 | buf[len] = 0; | |
149 | ret = simple_strtoul(buf, NULL, 0); | |
150 | if (ret > INT_MAX) | |
151 | return -ERANGE; | |
152 | return ret; | |
153 | } | |
154 | ||
155 | /* | |
156 | * Send us to sleep. | |
157 | */ | |
158 | static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp, | |
159 | void *buffer, size_t *lenp, loff_t *fpos) | |
160 | { | |
161 | int retval, mode; | |
162 | ||
163 | if (*lenp <= 0) | |
164 | return -EIO; | |
165 | ||
166 | mode = user_atoi(buffer, *lenp); | |
167 | if ((mode != 1) && (mode != 5)) | |
168 | return -EINVAL; | |
169 | ||
170 | retval = pm_send_all(PM_SUSPEND, (void *)3); | |
171 | ||
172 | if (retval == 0) { | |
173 | if (mode == 5) | |
174 | retval = pm_do_bus_sleep(); | |
175 | else | |
176 | retval = pm_do_suspend(); | |
177 | pm_send_all(PM_RESUME, (void *)0); | |
178 | } | |
179 | ||
180 | return retval; | |
181 | } | |
182 | ||
183 | static int try_set_cmode(int new_cmode) | |
184 | { | |
185 | if (new_cmode > 15) | |
186 | return -EINVAL; | |
187 | if (!(clock_cmodes_permitted & (1<<new_cmode))) | |
188 | return -EINVAL; | |
189 | ||
190 | /* tell all the drivers we're suspending */ | |
191 | pm_send_all(PM_SUSPEND, (void *)3); | |
192 | ||
193 | /* now change cmode */ | |
194 | local_irq_disable(); | |
195 | frv_dma_pause_all(); | |
196 | ||
197 | frv_change_cmode(new_cmode); | |
198 | ||
199 | determine_clocks(0); | |
200 | time_divisor_init(); | |
201 | ||
202 | #ifdef DEBUG | |
203 | determine_clocks(1); | |
204 | #endif | |
205 | frv_dma_resume_all(); | |
206 | local_irq_enable(); | |
207 | ||
208 | /* tell all the drivers we're resuming */ | |
209 | pm_send_all(PM_RESUME, (void *)0); | |
210 | return 0; | |
211 | } | |
212 | ||
213 | ||
214 | static int cmode_procctl(ctl_table *ctl, int write, struct file *filp, | |
215 | void *buffer, size_t *lenp, loff_t *fpos) | |
216 | { | |
217 | int new_cmode; | |
218 | ||
219 | if (!write) | |
220 | return proc_dointvec(ctl, write, filp, buffer, lenp, fpos); | |
221 | ||
222 | new_cmode = user_atoi(buffer, *lenp); | |
223 | ||
224 | return try_set_cmode(new_cmode)?:*lenp; | |
225 | } | |
226 | ||
227 | static int cmode_sysctl(ctl_table *table, int *name, int nlen, | |
228 | void *oldval, size_t *oldlenp, | |
229 | void *newval, size_t newlen, void **context) | |
230 | { | |
231 | if (oldval && oldlenp) { | |
232 | size_t oldlen; | |
233 | ||
234 | if (get_user(oldlen, oldlenp)) | |
235 | return -EFAULT; | |
236 | ||
237 | if (oldlen != sizeof(int)) | |
238 | return -EINVAL; | |
239 | ||
240 | if (put_user(clock_cmode_current, (unsigned int *)oldval) || | |
241 | put_user(sizeof(int), oldlenp)) | |
242 | return -EFAULT; | |
243 | } | |
244 | if (newval && newlen) { | |
245 | int new_cmode; | |
246 | ||
247 | if (newlen != sizeof(int)) | |
248 | return -EINVAL; | |
249 | ||
250 | if (get_user(new_cmode, (int *)newval)) | |
251 | return -EFAULT; | |
252 | ||
253 | return try_set_cmode(new_cmode)?:1; | |
254 | } | |
255 | return 1; | |
256 | } | |
257 | ||
258 | static int try_set_p0(int new_p0) | |
259 | { | |
260 | unsigned long flags, clkc; | |
261 | ||
262 | if (new_p0 < 0 || new_p0 > 1) | |
263 | return -EINVAL; | |
264 | ||
265 | local_irq_save(flags); | |
266 | __set_PSR(flags & ~PSR_ET); | |
267 | ||
268 | frv_dma_pause_all(); | |
269 | ||
270 | clkc = __get_CLKC(); | |
271 | if (new_p0) | |
272 | clkc |= CLKC_P0; | |
273 | else | |
274 | clkc &= ~CLKC_P0; | |
275 | __set_CLKC(clkc); | |
276 | ||
277 | determine_clocks(0); | |
278 | time_divisor_init(); | |
279 | ||
280 | #ifdef DEBUG | |
281 | determine_clocks(1); | |
282 | #endif | |
283 | frv_dma_resume_all(); | |
284 | local_irq_restore(flags); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int try_set_cm(int new_cm) | |
289 | { | |
290 | unsigned long flags, clkc; | |
291 | ||
292 | if (new_cm < 0 || new_cm > 1) | |
293 | return -EINVAL; | |
294 | ||
295 | local_irq_save(flags); | |
296 | __set_PSR(flags & ~PSR_ET); | |
297 | ||
298 | frv_dma_pause_all(); | |
299 | ||
300 | clkc = __get_CLKC(); | |
301 | clkc &= ~CLKC_CM; | |
302 | clkc |= new_cm; | |
303 | __set_CLKC(clkc); | |
304 | ||
305 | determine_clocks(0); | |
306 | time_divisor_init(); | |
307 | ||
308 | #if 1 //def DEBUG | |
309 | determine_clocks(1); | |
310 | #endif | |
311 | ||
312 | frv_dma_resume_all(); | |
313 | local_irq_restore(flags); | |
314 | return 0; | |
315 | } | |
316 | ||
317 | static int p0_procctl(ctl_table *ctl, int write, struct file *filp, | |
318 | void *buffer, size_t *lenp, loff_t *fpos) | |
319 | { | |
320 | int new_p0; | |
321 | ||
322 | if (!write) | |
323 | return proc_dointvec(ctl, write, filp, buffer, lenp, fpos); | |
324 | ||
325 | new_p0 = user_atoi(buffer, *lenp); | |
326 | ||
327 | return try_set_p0(new_p0)?:*lenp; | |
328 | } | |
329 | ||
330 | static int p0_sysctl(ctl_table *table, int *name, int nlen, | |
331 | void *oldval, size_t *oldlenp, | |
332 | void *newval, size_t newlen, void **context) | |
333 | { | |
334 | if (oldval && oldlenp) { | |
335 | size_t oldlen; | |
336 | ||
337 | if (get_user(oldlen, oldlenp)) | |
338 | return -EFAULT; | |
339 | ||
340 | if (oldlen != sizeof(int)) | |
341 | return -EINVAL; | |
342 | ||
343 | if (put_user(clock_p0_current, (unsigned int *)oldval) || | |
344 | put_user(sizeof(int), oldlenp)) | |
345 | return -EFAULT; | |
346 | } | |
347 | if (newval && newlen) { | |
348 | int new_p0; | |
349 | ||
350 | if (newlen != sizeof(int)) | |
351 | return -EINVAL; | |
352 | ||
353 | if (get_user(new_p0, (int *)newval)) | |
354 | return -EFAULT; | |
355 | ||
356 | return try_set_p0(new_p0)?:1; | |
357 | } | |
358 | return 1; | |
359 | } | |
360 | ||
361 | static int cm_procctl(ctl_table *ctl, int write, struct file *filp, | |
362 | void *buffer, size_t *lenp, loff_t *fpos) | |
363 | { | |
364 | int new_cm; | |
365 | ||
366 | if (!write) | |
367 | return proc_dointvec(ctl, write, filp, buffer, lenp, fpos); | |
368 | ||
369 | new_cm = user_atoi(buffer, *lenp); | |
370 | ||
371 | return try_set_cm(new_cm)?:*lenp; | |
372 | } | |
373 | ||
374 | static int cm_sysctl(ctl_table *table, int *name, int nlen, | |
375 | void *oldval, size_t *oldlenp, | |
376 | void *newval, size_t newlen, void **context) | |
377 | { | |
378 | if (oldval && oldlenp) { | |
379 | size_t oldlen; | |
380 | ||
381 | if (get_user(oldlen, oldlenp)) | |
382 | return -EFAULT; | |
383 | ||
384 | if (oldlen != sizeof(int)) | |
385 | return -EINVAL; | |
386 | ||
387 | if (put_user(clock_cm_current, (unsigned int *)oldval) || | |
388 | put_user(sizeof(int), oldlenp)) | |
389 | return -EFAULT; | |
390 | } | |
391 | if (newval && newlen) { | |
392 | int new_cm; | |
393 | ||
394 | if (newlen != sizeof(int)) | |
395 | return -EINVAL; | |
396 | ||
397 | if (get_user(new_cm, (int *)newval)) | |
398 | return -EFAULT; | |
399 | ||
400 | return try_set_cm(new_cm)?:1; | |
401 | } | |
402 | return 1; | |
403 | } | |
404 | ||
405 | ||
406 | static struct ctl_table pm_table[] = | |
407 | { | |
408 | {CTL_PM_SUSPEND, "suspend", NULL, 0, 0200, NULL, &sysctl_pm_do_suspend}, | |
409 | {CTL_PM_CMODE, "cmode", &clock_cmode_current, sizeof(int), 0644, NULL, &cmode_procctl, &cmode_sysctl, NULL}, | |
410 | {CTL_PM_P0, "p0", &clock_p0_current, sizeof(int), 0644, NULL, &p0_procctl, &p0_sysctl, NULL}, | |
411 | {CTL_PM_CM, "cm", &clock_cm_current, sizeof(int), 0644, NULL, &cm_procctl, &cm_sysctl, NULL}, | |
412 | {0} | |
413 | }; | |
414 | ||
415 | static struct ctl_table pm_dir_table[] = | |
416 | { | |
417 | {CTL_PM, "pm", NULL, 0, 0555, pm_table}, | |
418 | {0} | |
419 | }; | |
420 | ||
421 | /* | |
422 | * Initialize power interface | |
423 | */ | |
424 | static int __init pm_init(void) | |
425 | { | |
426 | register_sysctl_table(pm_dir_table, 1); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | __initcall(pm_init); | |
431 | ||
432 | #endif |