2 * SA1100 Power Management Routines
4 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License.
11 * 2001-02-06: Cliff Brake Initial code
13 * 2001-02-25: Sukjae Cho <sjcho@east.isi.edu> &
14 * Chester Kuo <chester@linux.org.tw>
15 * Save more value for the resume function! Support
16 * Bitsy/Assabet/Freebird board
18 * 2001-08-29: Nicolas Pitre <nico@cam.org>
19 * Cleaned up, pushed platform dependent stuff
20 * in the platform specific files.
22 * 2002-05-27: Nicolas Pitre Killed sleep.h and the kmalloced save array.
23 * Storage is local on the stack now.
25 #include <linux/init.h>
26 #include <linux/suspend.h>
27 #include <linux/errno.h>
28 #include <linux/time.h>
30 #include <asm/hardware.h>
31 #include <asm/memory.h>
32 #include <asm/system.h>
33 #include <asm/mach/time.h>
35 extern void sa1100_cpu_suspend(void);
36 extern void sa1100_cpu_resume(void);
38 #define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
39 #define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
42 * List of global SA11x0 peripheral registers to preserve.
43 * More ones like CP and general purpose register values are preserved
44 * on the stack and then the stack pointer is stored last in sleep.S.
46 enum { SLEEP_SAVE_SP = 0,
49 SLEEP_SAVE_OSMR0, SLEEP_SAVE_OSMR1, SLEEP_SAVE_OSMR2, SLEEP_SAVE_OSMR3,
51 SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
52 SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
60 static int sa11x0_pm_enter(u32 state)
62 unsigned long gpio, sleep_save[SLEEP_SAVE_SIZE];
63 struct timespec delta, rtc;
65 if (state != PM_SUSPEND_MEM)
68 /* preserve current time */
71 save_time_delta(&delta, &rtc);
74 /* save vital registers */
91 /* Clear previous reset status */
92 RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;
94 /* set resume return address */
95 PSPR = virt_to_phys(sa1100_cpu_resume);
101 * Ensure not to come back here if it wasn't intended
106 * Ensure interrupt sources are disabled; we will re-init
107 * the interrupt subsystem via the device manager.
113 /* restore registers */
128 * Clear the peripheral sleep-hold bit.
138 /* OSMR0 is the system timer: make sure OSCR is sufficiently behind */
139 OSCR = OSMR0 - LATCH;
141 /* restore current time */
143 restore_time_delta(&delta, &rtc);
148 unsigned long sleep_phys_sp(void *sp)
150 return virt_to_phys(sp);
154 * Called after processes are frozen, but before we shut down devices.
156 static int sa11x0_pm_prepare(u32 state)
162 * Called after devices are re-setup, but before processes are thawed.
164 static int sa11x0_pm_finish(u32 state)
170 * Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
172 static struct pm_ops sa11x0_pm_ops = {
173 .pm_disk_mode = PM_DISK_FIRMWARE,
174 .prepare = sa11x0_pm_prepare,
175 .enter = sa11x0_pm_enter,
176 .finish = sa11x0_pm_finish,
179 static int __init sa11x0_pm_init(void)
181 pm_set_ops(&sa11x0_pm_ops);
185 late_initcall(sa11x0_pm_init);