summaryrefslogtreecommitdiff
path: root/arch/arm/mach-sa1100/pm.c
blob: 9a7079f565bd394c4ae1436e8a2b14cd52acba34 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
/*
 * SA1100 Power Management Routines
 *
 * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License.
 *
 * History:
 *
 * 2001-02-06:	Cliff Brake         Initial code
 *
 * 2001-02-25:	Sukjae Cho <sjcho@east.isi.edu> &
 * 		Chester Kuo <chester@linux.org.tw>
 * 			Save more value for the resume function! Support
 * 			Bitsy/Assabet/Freebird board
 *
 * 2001-08-29:	Nicolas Pitre <nico@fluxnic.net>
 * 			Cleaned up, pushed platform dependent stuff
 * 			in the platform specific files.
 *
 * 2002-05-27:	Nicolas Pitre	Killed sleep.h and the kmalloced save array.
 * 				Storage is local on the stack now.
 */
#include <linux/init.h>
#include <linux/io.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>

#include <mach/hardware.h>
#include <asm/memory.h>
#include <asm/suspend.h>
#include <asm/mach/time.h>

extern int sa1100_finish_suspend(unsigned long);

#define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
#define RESTORE(x)	x = sleep_save[SLEEP_SAVE_##x]

/*
 * List of global SA11x0 peripheral registers to preserve.
 * More ones like CP and general purpose register values are preserved
 * on the stack and then the stack pointer is stored last in sleep.S.
 */
enum {	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,

	SLEEP_SAVE_Ser1SDCR0,

	SLEEP_SAVE_COUNT
};


static int sa11x0_pm_enter(suspend_state_t state)
{
	unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];

	gpio = GPLR;

	/* save vital registers */
	SAVE(GPDR);
	SAVE(GAFR);

	SAVE(PPDR);
	SAVE(PPSR);
	SAVE(PPAR);
	SAVE(PSDR);

	SAVE(Ser1SDCR0);

	/* Clear previous reset status */
	RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;

	/* set resume return address */
	PSPR = __pa_symbol(cpu_resume);

	/* go zzz */
	cpu_suspend(0, sa1100_finish_suspend);

	/*
	 * Ensure not to come back here if it wasn't intended
	 */
	RCSR = RCSR_SMR;
	PSPR = 0;

	/*
	 * Ensure interrupt sources are disabled; we will re-init
	 * the interrupt subsystem via the device manager.
	 */
	ICLR = 0;
	ICCR = 1;
	ICMR = 0;

	/* restore registers */
	RESTORE(GPDR);
	RESTORE(GAFR);

	RESTORE(PPDR);
	RESTORE(PPSR);
	RESTORE(PPAR);
	RESTORE(PSDR);

	RESTORE(Ser1SDCR0);

	GPSR = gpio;
	GPCR = ~gpio;

	/*
	 * Clear the peripheral sleep-hold bit.
	 */
	PSSR = PSSR_PH;

	return 0;
}

static const struct platform_suspend_ops sa11x0_pm_ops = {
	.enter		= sa11x0_pm_enter,
	.valid		= suspend_valid_only_mem,
};

int __init sa11x0_pm_init(void)
{
	suspend_set_ops(&sa11x0_pm_ops);
	return 0;
}