2 * FR-V Power Management Routines
4 * Copyright (c) 2004 Red Hat, Inc.
6 * Based on SA1100 version:
7 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License.
14 #include <linux/config.h>
15 #include <linux/init.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>
24 #include <asm/mb86943a.h>
28 void (*pm_power_off)(void);
30 extern void frv_change_cmode(int);
37 int pm_do_suspend(void)
44 frv_cpu_suspend(pdm_suspend_mode);
53 static unsigned long __irq_mask;
56 * Setup interrupt masks, etc to enable wakeup by power switch
58 static void __default_power_switch_setup(void)
60 /* default is to mask all interrupt sources. */
61 __irq_mask = *(unsigned long *)0xfeff9820;
62 *(unsigned long *)0xfeff9820 = 0xfffe0000;
66 * Cleanup interrupt masks, etc after wakeup by power switch
68 static void __default_power_switch_cleanup(void)
70 *(unsigned long *)0xfeff9820 = __irq_mask;
74 * Return non-zero if wakeup irq was caused by power switch
76 static int __default_power_switch_check(void)
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;
85 int pm_do_bus_sleep(void)
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.
94 __power_switch_wake_setup();
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.
105 frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
106 } while (__power_switch_wake_check && !__power_switch_wake_check());
111 * Here is where we need some platform-dependent restore
112 * of the interrupt state prior to being called.
114 __power_switch_wake_cleanup();
121 unsigned long sleep_phys_sp(void *sp)
123 return virt_to_phys(sp);
128 * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
129 * when all the PM interfaces exist nicely.
132 #define CTL_PM_SUSPEND 1
133 #define CTL_PM_CMODE 2
137 static int user_atoi(char *ubuf, size_t len)
145 if (copy_from_user(buf, ubuf, len))
149 ret = simple_strtoul(buf, NULL, 0);
158 static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp,
159 void *buffer, size_t *lenp, loff_t *fpos)
166 mode = user_atoi(buffer, *lenp);
167 if ((mode != 1) && (mode != 5))
170 retval = pm_send_all(PM_SUSPEND, (void *)3);
174 retval = pm_do_bus_sleep();
176 retval = pm_do_suspend();
177 pm_send_all(PM_RESUME, (void *)0);
183 static int try_set_cmode(int new_cmode)
187 if (!(clock_cmodes_permitted & (1<<new_cmode)))
190 /* tell all the drivers we're suspending */
191 pm_send_all(PM_SUSPEND, (void *)3);
193 /* now change cmode */
197 frv_change_cmode(new_cmode);
205 frv_dma_resume_all();
208 /* tell all the drivers we're resuming */
209 pm_send_all(PM_RESUME, (void *)0);
214 static int cmode_procctl(ctl_table *ctl, int write, struct file *filp,
215 void *buffer, size_t *lenp, loff_t *fpos)
220 return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
222 new_cmode = user_atoi(buffer, *lenp);
224 return try_set_cmode(new_cmode)?:*lenp;
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)
231 if (oldval && oldlenp) {
234 if (get_user(oldlen, oldlenp))
237 if (oldlen != sizeof(int))
240 if (put_user(clock_cmode_current, (unsigned int *)oldval) ||
241 put_user(sizeof(int), oldlenp))
244 if (newval && newlen) {
247 if (newlen != sizeof(int))
250 if (get_user(new_cmode, (int *)newval))
253 return try_set_cmode(new_cmode)?:1;
258 static int try_set_p0(int new_p0)
260 unsigned long flags, clkc;
262 if (new_p0 < 0 || new_p0 > 1)
265 local_irq_save(flags);
266 __set_PSR(flags & ~PSR_ET);
283 frv_dma_resume_all();
284 local_irq_restore(flags);
288 static int try_set_cm(int new_cm)
290 unsigned long flags, clkc;
292 if (new_cm < 0 || new_cm > 1)
295 local_irq_save(flags);
296 __set_PSR(flags & ~PSR_ET);
312 frv_dma_resume_all();
313 local_irq_restore(flags);
317 static int p0_procctl(ctl_table *ctl, int write, struct file *filp,
318 void *buffer, size_t *lenp, loff_t *fpos)
323 return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
325 new_p0 = user_atoi(buffer, *lenp);
327 return try_set_p0(new_p0)?:*lenp;
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)
334 if (oldval && oldlenp) {
337 if (get_user(oldlen, oldlenp))
340 if (oldlen != sizeof(int))
343 if (put_user(clock_p0_current, (unsigned int *)oldval) ||
344 put_user(sizeof(int), oldlenp))
347 if (newval && newlen) {
350 if (newlen != sizeof(int))
353 if (get_user(new_p0, (int *)newval))
356 return try_set_p0(new_p0)?:1;
361 static int cm_procctl(ctl_table *ctl, int write, struct file *filp,
362 void *buffer, size_t *lenp, loff_t *fpos)
367 return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
369 new_cm = user_atoi(buffer, *lenp);
371 return try_set_cm(new_cm)?:*lenp;
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)
378 if (oldval && oldlenp) {
381 if (get_user(oldlen, oldlenp))
384 if (oldlen != sizeof(int))
387 if (put_user(clock_cm_current, (unsigned int *)oldval) ||
388 put_user(sizeof(int), oldlenp))
391 if (newval && newlen) {
394 if (newlen != sizeof(int))
397 if (get_user(new_cm, (int *)newval))
400 return try_set_cm(new_cm)?:1;
406 static struct ctl_table pm_table[] =
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},
415 static struct ctl_table pm_dir_table[] =
417 {CTL_PM, "pm", NULL, 0, 0555, pm_table},
422 * Initialize power interface
424 static int __init pm_init(void)
426 register_sysctl_table(pm_dir_table, 1);