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/init.h>
15 #include <linux/module.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>
33 int pm_do_suspend(void)
40 frv_cpu_suspend(pdm_suspend_mode);
49 static unsigned long __irq_mask;
52 * Setup interrupt masks, etc to enable wakeup by power switch
54 static void __default_power_switch_setup(void)
56 /* default is to mask all interrupt sources. */
57 __irq_mask = *(unsigned long *)0xfeff9820;
58 *(unsigned long *)0xfeff9820 = 0xfffe0000;
62 * Cleanup interrupt masks, etc after wakeup by power switch
64 static void __default_power_switch_cleanup(void)
66 *(unsigned long *)0xfeff9820 = __irq_mask;
70 * Return non-zero if wakeup irq was caused by power switch
72 static int __default_power_switch_check(void)
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;
81 int pm_do_bus_sleep(void)
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.
90 __power_switch_wake_setup();
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.
101 frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
102 } while (__power_switch_wake_check && !__power_switch_wake_check());
107 * Here is where we need some platform-dependent restore
108 * of the interrupt state prior to being called.
110 __power_switch_wake_cleanup();
117 unsigned long sleep_phys_sp(void *sp)
119 return virt_to_phys(sp);
124 * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
125 * when all the PM interfaces exist nicely.
127 #define CTL_PM_SUSPEND 1
128 #define CTL_PM_CMODE 2
132 static int user_atoi(char __user *ubuf, size_t len)
140 if (copy_from_user(buf, ubuf, len))
144 ret = simple_strtoul(buf, NULL, 0);
153 static int sysctl_pm_do_suspend(ctl_table *ctl, int write, struct file *filp,
154 void __user *buffer, size_t *lenp, loff_t *fpos)
161 mode = user_atoi(buffer, *lenp);
162 if ((mode != 1) && (mode != 5))
167 retval = pm_do_bus_sleep();
169 retval = pm_do_suspend();
175 static int try_set_cmode(int new_cmode)
179 if (!(clock_cmodes_permitted & (1<<new_cmode)))
182 /* now change cmode */
186 frv_change_cmode(new_cmode);
194 frv_dma_resume_all();
201 static int cmode_procctl(ctl_table *ctl, int write, struct file *filp,
202 void __user *buffer, size_t *lenp, loff_t *fpos)
207 return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
209 new_cmode = user_atoi(buffer, *lenp);
211 return try_set_cmode(new_cmode)?:*lenp;
214 static int cmode_sysctl(ctl_table *table, int __user *name, int nlen,
215 void __user *oldval, size_t __user *oldlenp,
216 void __user *newval, size_t newlen)
218 if (oldval && oldlenp) {
221 if (get_user(oldlen, oldlenp))
224 if (oldlen != sizeof(int))
227 if (put_user(clock_cmode_current, (unsigned __user *)oldval) ||
228 put_user(sizeof(int), oldlenp))
231 if (newval && newlen) {
234 if (newlen != sizeof(int))
237 if (get_user(new_cmode, (int __user *)newval))
240 return try_set_cmode(new_cmode)?:1;
245 static int try_set_p0(int new_p0)
247 unsigned long flags, clkc;
249 if (new_p0 < 0 || new_p0 > 1)
252 local_irq_save(flags);
253 __set_PSR(flags & ~PSR_ET);
270 frv_dma_resume_all();
271 local_irq_restore(flags);
275 static int try_set_cm(int new_cm)
277 unsigned long flags, clkc;
279 if (new_cm < 0 || new_cm > 1)
282 local_irq_save(flags);
283 __set_PSR(flags & ~PSR_ET);
299 frv_dma_resume_all();
300 local_irq_restore(flags);
304 static int p0_procctl(ctl_table *ctl, int write, struct file *filp,
305 void __user *buffer, size_t *lenp, loff_t *fpos)
310 return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
312 new_p0 = user_atoi(buffer, *lenp);
314 return try_set_p0(new_p0)?:*lenp;
317 static int p0_sysctl(ctl_table *table, int __user *name, int nlen,
318 void __user *oldval, size_t __user *oldlenp,
319 void __user *newval, size_t newlen)
321 if (oldval && oldlenp) {
324 if (get_user(oldlen, oldlenp))
327 if (oldlen != sizeof(int))
330 if (put_user(clock_p0_current, (unsigned __user *)oldval) ||
331 put_user(sizeof(int), oldlenp))
334 if (newval && newlen) {
337 if (newlen != sizeof(int))
340 if (get_user(new_p0, (int __user *)newval))
343 return try_set_p0(new_p0)?:1;
348 static int cm_procctl(ctl_table *ctl, int write, struct file *filp,
349 void __user *buffer, size_t *lenp, loff_t *fpos)
354 return proc_dointvec(ctl, write, filp, buffer, lenp, fpos);
356 new_cm = user_atoi(buffer, *lenp);
358 return try_set_cm(new_cm)?:*lenp;
361 static int cm_sysctl(ctl_table *table, int __user *name, int nlen,
362 void __user *oldval, size_t __user *oldlenp,
363 void __user *newval, size_t newlen)
365 if (oldval && oldlenp) {
368 if (get_user(oldlen, oldlenp))
371 if (oldlen != sizeof(int))
374 if (put_user(clock_cm_current, (unsigned __user *)oldval) ||
375 put_user(sizeof(int), oldlenp))
378 if (newval && newlen) {
381 if (newlen != sizeof(int))
384 if (get_user(new_cm, (int __user *)newval))
387 return try_set_cm(new_cm)?:1;
393 static struct ctl_table pm_table[] =
396 .ctl_name = CTL_PM_SUSPEND,
397 .procname = "suspend",
401 .proc_handler = &sysctl_pm_do_suspend,
404 .ctl_name = CTL_PM_CMODE,
406 .data = &clock_cmode_current,
407 .maxlen = sizeof(int),
409 .proc_handler = &cmode_procctl,
410 .strategy = &cmode_sysctl,
413 .ctl_name = CTL_PM_P0,
415 .data = &clock_p0_current,
416 .maxlen = sizeof(int),
418 .proc_handler = &p0_procctl,
419 .strategy = &p0_sysctl,
422 .ctl_name = CTL_PM_CM,
424 .data = &clock_cm_current,
425 .maxlen = sizeof(int),
427 .proc_handler = &cm_procctl,
428 .strategy = &cm_sysctl,
433 static struct ctl_table pm_dir_table[] =
445 * Initialize power interface
447 static int __init pm_init(void)
449 register_sysctl_table(pm_dir_table);