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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * SA1100 Power Management Routines
3 *
4 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License.
8 *
9 * History:
10 *
11 * 2001-02-06: Cliff Brake Initial code
12 *
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
17 *
Nicolas Pitre2f82af02009-09-14 03:25:28 -040018 * 2001-08-29: Nicolas Pitre <nico@fluxnic.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 * Cleaned up, pushed platform dependent stuff
20 * in the platform specific files.
21 *
22 * 2002-05-27: Nicolas Pitre Killed sleep.h and the kmalloced save array.
23 * Storage is local on the stack now.
24 */
25#include <linux/init.h>
Russell King31696632012-06-06 11:42:36 +010026#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include <linux/suspend.h>
28#include <linux/errno.h>
29#include <linux/time.h>
30
Russell Kinga09e64f2008-08-05 16:14:15 +010031#include <mach/hardware.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include <asm/memory.h>
Russell King2c74a0c2011-06-22 17:41:48 +010033#include <asm/suspend.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <asm/mach/time.h>
35
Russell King29cb3cd2011-07-02 09:54:01 +010036extern int sa1100_finish_suspend(unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
38#define SAVE(x) sleep_save[SLEEP_SAVE_##x] = x
39#define RESTORE(x) x = sleep_save[SLEEP_SAVE_##x]
40
41/*
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.
45 */
Robert Jarzmik649de512008-05-02 21:17:06 +010046enum { SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
48
49 SLEEP_SAVE_Ser1SDCR0,
50
Robert Jarzmik649de512008-05-02 21:17:06 +010051 SLEEP_SAVE_COUNT
Linus Torvalds1da177e2005-04-16 15:20:36 -070052};
53
54
55static int sa11x0_pm_enter(suspend_state_t state)
56{
Robert Jarzmik649de512008-05-02 21:17:06 +010057 unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Linus Torvalds1da177e2005-04-16 15:20:36 -070059 gpio = GPLR;
60
61 /* save vital registers */
62 SAVE(GPDR);
63 SAVE(GAFR);
64
65 SAVE(PPDR);
66 SAVE(PPSR);
67 SAVE(PPAR);
68 SAVE(PSDR);
69
70 SAVE(Ser1SDCR0);
71
72 /* Clear previous reset status */
73 RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;
74
75 /* set resume return address */
Russell King96c20012011-02-06 17:41:40 +000076 PSPR = virt_to_phys(cpu_resume);
Linus Torvalds1da177e2005-04-16 15:20:36 -070077
78 /* go zzz */
Russell King2c74a0c2011-06-22 17:41:48 +010079 cpu_suspend(0, sa1100_finish_suspend);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 /*
82 * Ensure not to come back here if it wasn't intended
83 */
84 PSPR = 0;
85
86 /*
87 * Ensure interrupt sources are disabled; we will re-init
88 * the interrupt subsystem via the device manager.
89 */
90 ICLR = 0;
91 ICCR = 1;
92 ICMR = 0;
93
94 /* restore registers */
95 RESTORE(GPDR);
96 RESTORE(GAFR);
97
98 RESTORE(PPDR);
99 RESTORE(PPSR);
100 RESTORE(PPAR);
101 RESTORE(PSDR);
102
103 RESTORE(Ser1SDCR0);
104
105 GPSR = gpio;
106 GPCR = ~gpio;
107
108 /*
109 * Clear the peripheral sleep-hold bit.
110 */
111 PSSR = PSSR_PH;
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 return 0;
114}
115
Lionel Debroux2f55ac02010-11-16 14:14:02 +0100116static const struct platform_suspend_ops sa11x0_pm_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 .enter = sa11x0_pm_enter,
Rafael J. Wysocki26398a72007-10-18 03:04:40 -0700118 .valid = suspend_valid_only_mem,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119};
120
Shawn Guo7fea1ba2012-04-26 21:22:45 +0800121int __init sa11x0_pm_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122{
Rafael J. Wysocki26398a72007-10-18 03:04:40 -0700123 suspend_set_ops(&sa11x0_pm_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return 0;
125}