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@cam.org>
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/suspend.h>
27 #include <linux/errno.h>
28 #include <linux/time.h>
29
30 #include <asm/hardware.h>
31 #include <asm/memory.h>
32 #include <asm/system.h>
33 #include <asm/mach/time.h>
34
35 extern void sa1100_cpu_suspend(void);
36 extern void sa1100_cpu_resume(void);
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_SP = 0,
47
48 SLEEP_SAVE_GPDR, SLEEP_SAVE_GAFR,
49 SLEEP_SAVE_PPDR, SLEEP_SAVE_PPSR, SLEEP_SAVE_PPAR, SLEEP_SAVE_PSDR,
50
51 SLEEP_SAVE_Ser1SDCR0,
52
53 SLEEP_SAVE_SIZE
54 };
55
56
57 static int sa11x0_pm_enter(suspend_state_t state)
58 {
59 unsigned long gpio, sleep_save[SLEEP_SAVE_SIZE];
60
61 gpio = GPLR;
62
63 /* save vital registers */
64 SAVE(GPDR);
65 SAVE(GAFR);
66
67 SAVE(PPDR);
68 SAVE(PPSR);
69 SAVE(PPAR);
70 SAVE(PSDR);
71
72 SAVE(Ser1SDCR0);
73
74 /* Clear previous reset status */
75 RCSR = RCSR_HWR | RCSR_SWR | RCSR_WDR | RCSR_SMR;
76
77 /* set resume return address */
78 PSPR = virt_to_phys(sa1100_cpu_resume);
79
80 /* go zzz */
81 sa1100_cpu_suspend();
82
83 cpu_init();
84
85 /*
86 * Ensure not to come back here if it wasn't intended
87 */
88 PSPR = 0;
89
90 /*
91 * Ensure interrupt sources are disabled; we will re-init
92 * the interrupt subsystem via the device manager.
93 */
94 ICLR = 0;
95 ICCR = 1;
96 ICMR = 0;
97
98 /* restore registers */
99 RESTORE(GPDR);
100 RESTORE(GAFR);
101
102 RESTORE(PPDR);
103 RESTORE(PPSR);
104 RESTORE(PPAR);
105 RESTORE(PSDR);
106
107 RESTORE(Ser1SDCR0);
108
109 GPSR = gpio;
110 GPCR = ~gpio;
111
112 /*
113 * Clear the peripheral sleep-hold bit.
114 */
115 PSSR = PSSR_PH;
116
117 return 0;
118 }
119
120 unsigned long sleep_phys_sp(void *sp)
121 {
122 return virt_to_phys(sp);
123 }
124
125 static struct platform_suspend_ops sa11x0_pm_ops = {
126 .enter = sa11x0_pm_enter,
127 .valid = suspend_valid_only_mem,
128 };
129
130 static int __init sa11x0_pm_init(void)
131 {
132 suspend_set_ops(&sa11x0_pm_ops);
133 return 0;
134 }
135
136 late_initcall(sa11x0_pm_init);
137
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