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 #ifdef CONFIG_S3C2410_PM_DEBUG
41 extern void pm_dbg(const char *fmt, ...);
42 #define DBG(fmt...) pm_dbg(fmt)
43 #else
44 #define DBG(fmt...) printk(KERN_DEBUG fmt)
45 #endif
46
s3c2410_pm_prepare(void)47 static void s3c2410_pm_prepare(void)
48 {
49 /* ensure at least GSTATUS3 has the resume address */
50
51 __raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3);
52
53 DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
54 DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
55
56 if (machine_is_h1940()) {
57 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
58 unsigned long ptr;
59 unsigned long calc = 0;
60
61 /* generate check for the bootloader to check on resume */
62
63 for (ptr = 0; ptr < 0x40000; ptr += 0x400)
64 calc += __raw_readl(base+ptr);
65
66 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
67 }
68
69 /* the RX3715 uses similar code and the same H1940 and the
70 * same offsets for resume and checksum pointers */
71
72 if (machine_is_rx3715()) {
73 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
74 unsigned long ptr;
75 unsigned long calc = 0;
76
77 /* generate check for the bootloader to check on resume */
78
79 for (ptr = 0; ptr < 0x40000; ptr += 0x4)
80 calc += __raw_readl(base+ptr);
81
82 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
83 }
84
85 if ( machine_is_aml_m5900() )
86 s3c2410_gpio_setpin(S3C2410_GPF2, 1);
87
88 }
89
s3c2410_pm_resume(struct sys_device * dev)90 static int s3c2410_pm_resume(struct sys_device *dev)
91 {
92 unsigned long tmp;
93
94 /* unset the return-from-sleep flag, to ensure reset */
95
96 tmp = __raw_readl(S3C2410_GSTATUS2);
97 tmp &= S3C2410_GSTATUS2_OFFRESET;
98 __raw_writel(tmp, S3C2410_GSTATUS2);
99
100 if ( machine_is_aml_m5900() )
101 s3c2410_gpio_setpin(S3C2410_GPF2, 0);
102
103 return 0;
104 }
105
s3c2410_pm_add(struct sys_device * dev)106 static int s3c2410_pm_add(struct sys_device *dev)
107 {
108 pm_cpu_prep = s3c2410_pm_prepare;
109 pm_cpu_sleep = s3c2410_cpu_suspend;
110
111 return 0;
112 }
113
114 #if defined(CONFIG_CPU_S3C2410)
115 static struct sysdev_driver s3c2410_pm_driver = {
116 .add = s3c2410_pm_add,
117 .resume = s3c2410_pm_resume,
118 };
119
120 /* register ourselves */
121
s3c2410_pm_drvinit(void)122 static int __init s3c2410_pm_drvinit(void)
123 {
124 return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
125 }
126
127 arch_initcall(s3c2410_pm_drvinit);
128 #endif
129
130 #if defined(CONFIG_CPU_S3C2440)
131 static struct sysdev_driver s3c2440_pm_driver = {
132 .add = s3c2410_pm_add,
133 .resume = s3c2410_pm_resume,
134 };
135
s3c2440_pm_drvinit(void)136 static int __init s3c2440_pm_drvinit(void)
137 {
138 return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
139 }
140
141 arch_initcall(s3c2440_pm_drvinit);
142 #endif
143
144 #if defined(CONFIG_CPU_S3C2442)
145 static struct sysdev_driver s3c2442_pm_driver = {
146 .add = s3c2410_pm_add,
147 .resume = s3c2410_pm_resume,
148 };
149
s3c2442_pm_drvinit(void)150 static int __init s3c2442_pm_drvinit(void)
151 {
152 return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
153 }
154
155 arch_initcall(s3c2442_pm_drvinit);
156 #endif
157