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/gpio.h>
  29 #include <linux/io.h>
  30
  31 #include <mach/hardware.h>
  32
  33 #include <asm/mach-types.h>
  34
  35 #include <mach/regs-gpio.h>
  36 #include <mach/h1940.h>
  37
  38 #include <plat/cpu.h>
  39 #include <plat/pm.h>
  40
  41 static void s3c2410_pm_prepare(void)
  42 {
  43         /* ensure at least GSTATUS3 has the resume address */
  44
  45         __raw_writel(virt_to_phys(s3c_cpu_resume), S3C2410_GSTATUS3);
  46
  47         S3C_PMDBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
  48         S3C_PMDBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
  49
  50         if (machine_is_h1940()) {
  51                 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
  52                 unsigned long ptr;
  53                 unsigned long calc = 0;
  54
  55                 /* generate check for the bootloader to check on resume */
  56
  57                 for (ptr = 0; ptr < 0x40000; ptr += 0x400)
  58                         calc += __raw_readl(base+ptr);
  59
  60                 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
  61         }
  62
  63         /* the RX3715 uses similar code and the same H1940 and the
  64          * same offsets for resume and checksum pointers */
  65
  66         if (machine_is_rx3715()) {
  67                 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
  68                 unsigned long ptr;
  69                 unsigned long calc = 0;
  70
  71                 /* generate check for the bootloader to check on resume */
  72
  73                 for (ptr = 0; ptr < 0x40000; ptr += 0x4)
  74                         calc += __raw_readl(base+ptr);
  75
  76                 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
  77         }
  78
  79         if ( machine_is_aml_m5900() )
  80                 s3c2410_gpio_setpin(S3C2410_GPF(2), 1);
  81
  82 }
  83
  84 static int s3c2410_pm_resume(struct sys_device *dev)
  85 {
  86         unsigned long tmp;
  87
  88         /* unset the return-from-sleep flag, to ensure reset */
  89
  90         tmp = __raw_readl(S3C2410_GSTATUS2);
  91         tmp &= S3C2410_GSTATUS2_OFFRESET;
  92         __raw_writel(tmp, S3C2410_GSTATUS2);
  93
  94         if ( machine_is_aml_m5900() )
  95                 s3c2410_gpio_setpin(S3C2410_GPF(2), 0);
  96
  97         return 0;
  98 }
  99
 100 static int s3c2410_pm_add(struct sys_device *dev)
 101 {
 102         pm_cpu_prep = s3c2410_pm_prepare;
 103         pm_cpu_sleep = s3c2410_cpu_suspend;
 104
 105         return 0;
 106 }
 107
 108 #if defined(CONFIG_CPU_S3C2410)
 109 static struct sysdev_driver s3c2410_pm_driver = {
 110         .add            = s3c2410_pm_add,
 111         .resume         = s3c2410_pm_resume,
 112 };
 113
 114 /* register ourselves */
 115
 116 static int __init s3c2410_pm_drvinit(void)
 117 {
 118         return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
 119 }
 120
 121 arch_initcall(s3c2410_pm_drvinit);
 122 #endif
 123
 124 #if defined(CONFIG_CPU_S3C2440)
 125 static struct sysdev_driver s3c2440_pm_driver = {
 126         .add            = s3c2410_pm_add,
 127         .resume         = s3c2410_pm_resume,
 128 };
 129
 130 static int __init s3c2440_pm_drvinit(void)
 131 {
 132         return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
 133 }
 134
 135 arch_initcall(s3c2440_pm_drvinit);
 136 #endif
 137
 138 #if defined(CONFIG_CPU_S3C2442)
 139 static struct sysdev_driver s3c2442_pm_driver = {
 140         .add            = s3c2410_pm_add,
 141         .resume         = s3c2410_pm_resume,
 142 };
 143
 144 static int __init s3c2442_pm_drvinit(void)
 145 {
 146         return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
 147 }
 148
 149 arch_initcall(s3c2442_pm_drvinit);
 150 #endif