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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 | ||
1da177e4 | 14 | #include <linux/init.h> |
40234401 | 15 | #include <linux/module.h> |
1da177e4 LT |
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 | ||
1da177e4 LT |
28 | /* |
29 | * Debug macros | |
30 | */ | |
31 | #define DEBUG | |
32 | ||
33 | int pm_do_suspend(void) | |
34 | { | |
35 | local_irq_disable(); | |
36 | ||
37 | __set_LEDS(0xb1); | |
38 | ||
39 | /* go zzz */ | |
40 | frv_cpu_suspend(pdm_suspend_mode); | |
41 | ||
42 | __set_LEDS(0xb2); | |
43 | ||
44 | local_irq_enable(); | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static unsigned long __irq_mask; | |
50 | ||
51 | /* | |
52 | * Setup interrupt masks, etc to enable wakeup by power switch | |
53 | */ | |
54 | static void __default_power_switch_setup(void) | |
55 | { | |
56 | /* default is to mask all interrupt sources. */ | |
57 | __irq_mask = *(unsigned long *)0xfeff9820; | |
58 | *(unsigned long *)0xfeff9820 = 0xfffe0000; | |
59 | } | |
60 | ||
61 | /* | |
62 | * Cleanup interrupt masks, etc after wakeup by power switch | |
63 | */ | |
64 | static void __default_power_switch_cleanup(void) | |
65 | { | |
66 | *(unsigned long *)0xfeff9820 = __irq_mask; | |
67 | } | |
68 | ||
69 | /* | |
70 | * Return non-zero if wakeup irq was caused by power switch | |
71 | */ | |
72 | static int __default_power_switch_check(void) | |
73 | { | |
74 | return 1; | |
75 | } | |
76 | ||
77 | void (*__power_switch_wake_setup)(void) = __default_power_switch_setup; | |
78 | int (*__power_switch_wake_check)(void) = __default_power_switch_check; | |
79 | void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup; | |
80 | ||
81 | int pm_do_bus_sleep(void) | |
82 | { | |
83 | local_irq_disable(); | |
84 | ||
85 | /* | |
86 | * Here is where we need some platform-dependent setup | |
87 | * of the interrupt state so that appropriate wakeup | |
88 | * sources are allowed and all others are masked. | |
89 | */ | |
90 | __power_switch_wake_setup(); | |
91 | ||
92 | __set_LEDS(0xa1); | |
93 | ||
94 | /* go zzz | |
95 | * | |
96 | * This is in a loop in case power switch shares an irq with other | |
97 | * devices. The wake_check() tells us if we need to finish waking | |
98 | * or go back to sleep. | |
99 | */ | |
100 | do { | |
101 | frv_cpu_suspend(HSR0_PDM_BUS_SLEEP); | |
102 | } while (__power_switch_wake_check && !__power_switch_wake_check()); | |
103 | ||
104 | __set_LEDS(0xa2); | |
105 | ||
106 | /* | |
107 | * Here is where we need some platform-dependent restore | |
108 | * of the interrupt state prior to being called. | |
109 | */ | |
110 | __power_switch_wake_cleanup(); | |
111 | ||
112 | local_irq_enable(); | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
117 | unsigned long sleep_phys_sp(void *sp) | |
118 | { | |
119 | return virt_to_phys(sp); | |
120 | } | |
121 | ||
122 | #ifdef CONFIG_SYSCTL | |
123 | /* | |
124 | * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6 | |
125 | * when all the PM interfaces exist nicely. | |
126 | */ | |
1da177e4 LT |
127 | #define CTL_PM_SUSPEND 1 |
128 | #define CTL_PM_CMODE 2 | |
129 | #define CTL_PM_P0 4 | |
130 | #define CTL_PM_CM 5 | |
131 | ||
7ab76d72 | 132 | static int user_atoi(char __user *ubuf, size_t len) |
1da177e4 LT |
133 | { |
134 | char buf[16]; | |
135 | unsigned long ret; | |
136 | ||
137 | if (len > 15) | |
138 | return -EINVAL; | |
139 | ||
140 | if (copy_from_user(buf, ubuf, len)) | |
141 | return -EFAULT; | |
142 | ||
143 | buf[len] = 0; | |
144 | ret = simple_strtoul(buf, NULL, 0); | |
145 | if (ret > INT_MAX) | |
146 | return -ERANGE; | |
147 | return ret; | |
148 | } | |
149 | ||
150 | /* | |
151 | * Send us to sleep. | |
152 | */ | |
8d65af78 | 153 | static int sysctl_pm_do_suspend(ctl_table *ctl, int write, |
7ab76d72 | 154 | void __user *buffer, size_t *lenp, loff_t *fpos) |
1da177e4 LT |
155 | { |
156 | int retval, mode; | |
157 | ||
158 | if (*lenp <= 0) | |
159 | return -EIO; | |
160 | ||
161 | mode = user_atoi(buffer, *lenp); | |
162 | if ((mode != 1) && (mode != 5)) | |
163 | return -EINVAL; | |
164 | ||
1da177e4 LT |
165 | if (retval == 0) { |
166 | if (mode == 5) | |
167 | retval = pm_do_bus_sleep(); | |
168 | else | |
169 | retval = pm_do_suspend(); | |
1da177e4 LT |
170 | } |
171 | ||
172 | return retval; | |
173 | } | |
174 | ||
175 | static int try_set_cmode(int new_cmode) | |
176 | { | |
177 | if (new_cmode > 15) | |
178 | return -EINVAL; | |
179 | if (!(clock_cmodes_permitted & (1<<new_cmode))) | |
180 | return -EINVAL; | |
181 | ||
1da177e4 LT |
182 | /* now change cmode */ |
183 | local_irq_disable(); | |
184 | frv_dma_pause_all(); | |
185 | ||
186 | frv_change_cmode(new_cmode); | |
187 | ||
188 | determine_clocks(0); | |
189 | time_divisor_init(); | |
190 | ||
191 | #ifdef DEBUG | |
192 | determine_clocks(1); | |
193 | #endif | |
194 | frv_dma_resume_all(); | |
195 | local_irq_enable(); | |
196 | ||
1da177e4 LT |
197 | return 0; |
198 | } | |
199 | ||
200 | ||
8d65af78 | 201 | static int cmode_procctl(ctl_table *ctl, int write, |
7ab76d72 | 202 | void __user *buffer, size_t *lenp, loff_t *fpos) |
1da177e4 LT |
203 | { |
204 | int new_cmode; | |
205 | ||
206 | if (!write) | |
8d65af78 | 207 | return proc_dointvec(ctl, write, buffer, lenp, fpos); |
1da177e4 LT |
208 | |
209 | new_cmode = user_atoi(buffer, *lenp); | |
210 | ||
211 | return try_set_cmode(new_cmode)?:*lenp; | |
212 | } | |
213 | ||
1da177e4 LT |
214 | static int try_set_p0(int new_p0) |
215 | { | |
216 | unsigned long flags, clkc; | |
217 | ||
218 | if (new_p0 < 0 || new_p0 > 1) | |
219 | return -EINVAL; | |
220 | ||
221 | local_irq_save(flags); | |
222 | __set_PSR(flags & ~PSR_ET); | |
223 | ||
224 | frv_dma_pause_all(); | |
225 | ||
226 | clkc = __get_CLKC(); | |
227 | if (new_p0) | |
228 | clkc |= CLKC_P0; | |
229 | else | |
230 | clkc &= ~CLKC_P0; | |
231 | __set_CLKC(clkc); | |
232 | ||
233 | determine_clocks(0); | |
234 | time_divisor_init(); | |
235 | ||
236 | #ifdef DEBUG | |
237 | determine_clocks(1); | |
238 | #endif | |
239 | frv_dma_resume_all(); | |
240 | local_irq_restore(flags); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static int try_set_cm(int new_cm) | |
245 | { | |
246 | unsigned long flags, clkc; | |
247 | ||
248 | if (new_cm < 0 || new_cm > 1) | |
249 | return -EINVAL; | |
250 | ||
251 | local_irq_save(flags); | |
252 | __set_PSR(flags & ~PSR_ET); | |
253 | ||
254 | frv_dma_pause_all(); | |
255 | ||
256 | clkc = __get_CLKC(); | |
257 | clkc &= ~CLKC_CM; | |
258 | clkc |= new_cm; | |
259 | __set_CLKC(clkc); | |
260 | ||
261 | determine_clocks(0); | |
262 | time_divisor_init(); | |
263 | ||
264 | #if 1 //def DEBUG | |
265 | determine_clocks(1); | |
266 | #endif | |
267 | ||
268 | frv_dma_resume_all(); | |
269 | local_irq_restore(flags); | |
270 | return 0; | |
271 | } | |
272 | ||
8d65af78 | 273 | static int p0_procctl(ctl_table *ctl, int write, |
7ab76d72 | 274 | void __user *buffer, size_t *lenp, loff_t *fpos) |
1da177e4 LT |
275 | { |
276 | int new_p0; | |
277 | ||
278 | if (!write) | |
8d65af78 | 279 | return proc_dointvec(ctl, write, buffer, lenp, fpos); |
1da177e4 LT |
280 | |
281 | new_p0 = user_atoi(buffer, *lenp); | |
282 | ||
283 | return try_set_p0(new_p0)?:*lenp; | |
284 | } | |
285 | ||
8d65af78 | 286 | static int cm_procctl(ctl_table *ctl, int write, |
7ab76d72 | 287 | void __user *buffer, size_t *lenp, loff_t *fpos) |
1da177e4 LT |
288 | { |
289 | int new_cm; | |
290 | ||
291 | if (!write) | |
8d65af78 | 292 | return proc_dointvec(ctl, write, buffer, lenp, fpos); |
1da177e4 LT |
293 | |
294 | new_cm = user_atoi(buffer, *lenp); | |
295 | ||
296 | return try_set_cm(new_cm)?:*lenp; | |
297 | } | |
298 | ||
1da177e4 LT |
299 | static struct ctl_table pm_table[] = |
300 | { | |
dfd007a6 | 301 | { |
dfd007a6 EB |
302 | .procname = "suspend", |
303 | .data = NULL, | |
304 | .maxlen = 0, | |
305 | .mode = 0200, | |
6d456111 | 306 | .proc_handler = sysctl_pm_do_suspend, |
dfd007a6 EB |
307 | }, |
308 | { | |
dfd007a6 EB |
309 | .procname = "cmode", |
310 | .data = &clock_cmode_current, | |
311 | .maxlen = sizeof(int), | |
312 | .mode = 0644, | |
6d456111 | 313 | .proc_handler = cmode_procctl, |
dfd007a6 EB |
314 | }, |
315 | { | |
dfd007a6 EB |
316 | .procname = "p0", |
317 | .data = &clock_p0_current, | |
318 | .maxlen = sizeof(int), | |
319 | .mode = 0644, | |
6d456111 | 320 | .proc_handler = p0_procctl, |
dfd007a6 EB |
321 | }, |
322 | { | |
dfd007a6 EB |
323 | .procname = "cm", |
324 | .data = &clock_cm_current, | |
325 | .maxlen = sizeof(int), | |
326 | .mode = 0644, | |
6d456111 | 327 | .proc_handler = cm_procctl, |
dfd007a6 | 328 | }, |
67a7e4f8 | 329 | { } |
1da177e4 LT |
330 | }; |
331 | ||
332 | static struct ctl_table pm_dir_table[] = | |
333 | { | |
dfd007a6 | 334 | { |
dfd007a6 EB |
335 | .procname = "pm", |
336 | .mode = 0555, | |
337 | .child = pm_table, | |
338 | }, | |
67a7e4f8 | 339 | { } |
1da177e4 LT |
340 | }; |
341 | ||
342 | /* | |
343 | * Initialize power interface | |
344 | */ | |
345 | static int __init pm_init(void) | |
346 | { | |
0b4d4147 | 347 | register_sysctl_table(pm_dir_table); |
1da177e4 LT |
348 | return 0; |
349 | } | |
350 | ||
351 | __initcall(pm_init); | |
352 | ||
353 | #endif |