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
36 extern 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 */
46 enum { 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
sa11x0_pm_enter(suspend_state_t state)55 static 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 = __pa_symbol(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 RCSR = RCSR_SMR;
85 PSPR = 0;
86
87 /*
88 * Ensure interrupt sources are disabled; we will re-init
89 * the interrupt subsystem via the device manager.
90 */
91 ICLR = 0;
92 ICCR = 1;
93 ICMR = 0;
94
95 /* restore registers */
96 RESTORE(GPDR);
97 RESTORE(GAFR);
98
99 RESTORE(PPDR);
100 RESTORE(PPSR);
101 RESTORE(PPAR);
102 RESTORE(PSDR);
103
104 RESTORE(Ser1SDCR0);
105
106 GPSR = gpio;
107 GPCR = ~gpio;
108
109 /*
110 * Clear the peripheral sleep-hold bit.
111 */
112 PSSR = PSSR_PH;
113
114 return 0;
115 }
116
117 static const struct platform_suspend_ops sa11x0_pm_ops = {
118 .enter = sa11x0_pm_enter,
119 .valid = suspend_valid_only_mem,
120 };
121
sa11x0_pm_init(void)122 int __init sa11x0_pm_init(void)
123 {
124 suspend_set_ops(&sa11x0_pm_ops);
125 return 0;
126 }
127