1/*
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 *
18 * 2001-08-29:	Nicolas Pitre <nico@fluxnic.net>
19 * 			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>
26#include <linux/io.h>
27#include <linux/suspend.h>
28#include <linux/errno.h>
29#include <linux/time.h>
30
31#include <mach/hardware.h>
32#include <asm/memory.h>
33#include <asm/suspend.h>
34#include <asm/mach/time.h>
35
36extern int sa1100_finish_suspend(unsigned long);
37
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 */
46enum {	SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
47	SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
48
49	SLEEP_SAVE_Ser1SDCR0,
50
51	SLEEP_SAVE_COUNT
52};
53
54
55static int sa11x0_pm_enter(suspend_state_t state)
56{
57	unsigned long gpio, sleep_save[SLEEP_SAVE_COUNT];
58
59	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 */
76	PSPR = virt_to_phys(cpu_resume);
77
78	/* go zzz */
79	cpu_suspend(0, sa1100_finish_suspend);
80
81	/*
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
113	return 0;
114}
115
116static const struct platform_suspend_ops sa11x0_pm_ops = {
117	.enter		= sa11x0_pm_enter,
118	.valid		= suspend_valid_only_mem,
119};
120
121int __init sa11x0_pm_init(void)
122{
123	suspend_set_ops(&sa11x0_pm_ops);
124	return 0;
125}
126