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