Merge branch 'next-s3c-pm' of git://aeryn.fluff.org.uk/bjdooks/linux into devel
[deliverable/linux.git] / arch / arm / mach-s3c2410 / pm.c
1 /* linux/arch/arm/mach-s3c2410/pm.c
2 *
3 * Copyright (c) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2410 (and compatible) Power Manager (Suspend-To-RAM) support
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23 #include <linux/init.h>
24 #include <linux/suspend.h>
25 #include <linux/errno.h>
26 #include <linux/time.h>
27 #include <linux/sysdev.h>
28 #include <linux/io.h>
29
30 #include <mach/hardware.h>
31
32 #include <asm/mach-types.h>
33
34 #include <mach/regs-gpio.h>
35 #include <mach/h1940.h>
36
37 #include <plat/cpu.h>
38 #include <plat/pm.h>
39
40 static void s3c2410_pm_prepare(void)
41 {
42 /* ensure at least GSTATUS3 has the resume address */
43
44 __raw_writel(virt_to_phys(s3c_cpu_resume), S3C2410_GSTATUS3);
45
46 S3C_PMDBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
47 S3C_PMDBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
48
49 if (machine_is_h1940()) {
50 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
51 unsigned long ptr;
52 unsigned long calc = 0;
53
54 /* generate check for the bootloader to check on resume */
55
56 for (ptr = 0; ptr < 0x40000; ptr += 0x400)
57 calc += __raw_readl(base+ptr);
58
59 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
60 }
61
62 /* the RX3715 uses similar code and the same H1940 and the
63 * same offsets for resume and checksum pointers */
64
65 if (machine_is_rx3715()) {
66 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
67 unsigned long ptr;
68 unsigned long calc = 0;
69
70 /* generate check for the bootloader to check on resume */
71
72 for (ptr = 0; ptr < 0x40000; ptr += 0x4)
73 calc += __raw_readl(base+ptr);
74
75 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
76 }
77
78 if ( machine_is_aml_m5900() )
79 s3c2410_gpio_setpin(S3C2410_GPF2, 1);
80
81 }
82
83 static int s3c2410_pm_resume(struct sys_device *dev)
84 {
85 unsigned long tmp;
86
87 /* unset the return-from-sleep flag, to ensure reset */
88
89 tmp = __raw_readl(S3C2410_GSTATUS2);
90 tmp &= S3C2410_GSTATUS2_OFFRESET;
91 __raw_writel(tmp, S3C2410_GSTATUS2);
92
93 if ( machine_is_aml_m5900() )
94 s3c2410_gpio_setpin(S3C2410_GPF2, 0);
95
96 return 0;
97 }
98
99 static int s3c2410_pm_add(struct sys_device *dev)
100 {
101 pm_cpu_prep = s3c2410_pm_prepare;
102 pm_cpu_sleep = s3c2410_cpu_suspend;
103
104 return 0;
105 }
106
107 #if defined(CONFIG_CPU_S3C2410)
108 static struct sysdev_driver s3c2410_pm_driver = {
109 .add = s3c2410_pm_add,
110 .resume = s3c2410_pm_resume,
111 };
112
113 /* register ourselves */
114
115 static int __init s3c2410_pm_drvinit(void)
116 {
117 return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
118 }
119
120 arch_initcall(s3c2410_pm_drvinit);
121 #endif
122
123 #if defined(CONFIG_CPU_S3C2440)
124 static struct sysdev_driver s3c2440_pm_driver = {
125 .add = s3c2410_pm_add,
126 .resume = s3c2410_pm_resume,
127 };
128
129 static int __init s3c2440_pm_drvinit(void)
130 {
131 return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
132 }
133
134 arch_initcall(s3c2440_pm_drvinit);
135 #endif
136
137 #if defined(CONFIG_CPU_S3C2442)
138 static struct sysdev_driver s3c2442_pm_driver = {
139 .add = s3c2410_pm_add,
140 .resume = s3c2410_pm_resume,
141 };
142
143 static int __init s3c2442_pm_drvinit(void)
144 {
145 return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
146 }
147
148 arch_initcall(s3c2442_pm_drvinit);
149 #endif
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