arch/arm/mach-s3c2410/s3c2410-pm.c

   1 /* linux/arch/arm/mach-s3c2410/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
  29 #include <asm/hardware.h>
  30 #include <asm/io.h>
  31
  32 #include <asm/arch/regs-gpio.h>
  33
  34 #include "cpu.h"
  35 #include "pm.h"
  36
  37 #ifdef CONFIG_S3C2410_PM_DEBUG
  38 extern void pm_dbg(const char *fmt, ...);
  39 #define DBG(fmt...) pm_dbg(fmt)
  40 #else
  41 #define DBG(fmt...) printk(KERN_DEBUG fmt)
  42 #endif
  43
  44 static void s3c2410_pm_prepare(void)
  45 {
  46         /* ensure at least GSTATUS3 has the resume address */
  47
  48         __raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3);
  49
  50         DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
  51         DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
  52 }
  53
  54 int s3c2410_pm_resume(struct sys_device *dev)
  55 {
  56         unsigned long tmp;
  57
  58         /* unset the return-from-sleep flag, to ensure reset */
  59
  60         tmp = __raw_readl(S3C2410_GSTATUS2);
  61         tmp &= S3C2410_GSTATUS2_OFFRESET;
  62         __raw_writel(tmp, S3C2410_GSTATUS2);
  63
  64         return 0;
  65 }
  66
  67 static int s3c2410_pm_add(struct sys_device *dev)
  68 {
  69         pm_cpu_prep = s3c2410_pm_prepare;
  70         pm_cpu_sleep = s3c2410_cpu_suspend;
  71
  72         return 0;
  73 }
  74
  75 static struct sysdev_driver s3c2410_pm_driver = {
  76         .add            = s3c2410_pm_add,
  77         .resume         = s3c2410_pm_resume,
  78 };
  79
  80 /* register ourselves */
  81
  82 static int __init s3c2410_pm_drvinit(void)
  83 {
  84         return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
  85 }
  86
  87 arch_initcall(s3c2410_pm_drvinit);
  88
  89 static struct sysdev_driver s3c2440_pm_driver = {
  90         .add            = s3c2410_pm_add,
  91         .resume         = s3c2410_pm_resume,
  92 };
  93
  94 static int __init s3c2440_pm_drvinit(void)
  95 {
  96         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
  97 }
  98
  99 arch_initcall(s3c2440_pm_drvinit);
 100
 101 static struct sysdev_driver s3c2442_pm_driver = {
 102         .add            = s3c2410_pm_add,
 103         .resume         = s3c2410_pm_resume,
 104 };
 105
 106 static int __init s3c2442_pm_drvinit(void)
 107 {
 108         return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
 109 }
 110
 111 arch_initcall(s3c2442_pm_drvinit);