1 /* linux/arch/arm/mach-s3c2410/s3c2410-pm.c
3 * Copyright (c) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * S3C2410 (and compatible) Power Manager (Suspend-To-RAM) support
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.
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.
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
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>
29 #include <asm/hardware.h>
32 #include <asm/mach-types.h>
34 #include <asm/arch/regs-gpio.h>
39 #ifdef CONFIG_S3C2410_PM_DEBUG
40 extern void pm_dbg(const char *fmt, ...);
41 #define DBG(fmt...) pm_dbg(fmt)
43 #define DBG(fmt...) printk(KERN_DEBUG fmt)
46 static void s3c2410_pm_prepare(void)
48 /* ensure at least GSTATUS3 has the resume address */
50 __raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3);
52 DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
53 DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
55 if ( machine_is_aml_m5900() )
56 s3c2410_gpio_setpin(S3C2410_GPF2, 1);
60 int s3c2410_pm_resume(struct sys_device *dev)
64 /* unset the return-from-sleep flag, to ensure reset */
66 tmp = __raw_readl(S3C2410_GSTATUS2);
67 tmp &= S3C2410_GSTATUS2_OFFRESET;
68 __raw_writel(tmp, S3C2410_GSTATUS2);
70 if ( machine_is_aml_m5900() )
71 s3c2410_gpio_setpin(S3C2410_GPF2, 0);
76 static int s3c2410_pm_add(struct sys_device *dev)
78 pm_cpu_prep = s3c2410_pm_prepare;
79 pm_cpu_sleep = s3c2410_cpu_suspend;
84 static struct sysdev_driver s3c2410_pm_driver = {
85 .add = s3c2410_pm_add,
86 .resume = s3c2410_pm_resume,
89 /* register ourselves */
91 static int __init s3c2410_pm_drvinit(void)
93 return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
96 arch_initcall(s3c2410_pm_drvinit);
98 static struct sysdev_driver s3c2440_pm_driver = {
99 .add = s3c2410_pm_add,
100 .resume = s3c2410_pm_resume,
103 static int __init s3c2440_pm_drvinit(void)
105 return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
108 arch_initcall(s3c2440_pm_drvinit);
110 static struct sysdev_driver s3c2442_pm_driver = {
111 .add = s3c2410_pm_add,
112 .resume = s3c2410_pm_resume,
115 static int __init s3c2442_pm_drvinit(void)
117 return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
120 arch_initcall(s3c2442_pm_drvinit);