arch/arm/mach-s3c24xx/pm-s3c2410.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/device.h>
  28 #include <linux/syscore_ops.h>
  29 #include <linux/gpio.h>
  30 #include <linux/io.h>
  31
  32 #include <asm/mach-types.h>
  33
  34 #include <mach/hardware.h>
  35 #include <mach/regs-gpio.h>
  36 #include <mach/gpio-samsung.h>
  37
  38 #include <plat/gpio-cfg.h>
  39 #include <plat/cpu.h>
  40 #include <plat/pm.h>
  41
  42 #include "h1940.h"
  43
  44 static void s3c2410_pm_prepare(void)
  45 {
  46         /* ensure at least GSTATUS3 has the resume address */
  47
  48         __raw_writel(__pa_symbol(s3c_cpu_resume), S3C2410_GSTATUS3);
  49
  50         S3C_PMDBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
  51         S3C_PMDBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
  52
  53         if (machine_is_h1940()) {
  54                 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
  55                 unsigned long ptr;
  56                 unsigned long calc = 0;
  57
  58                 /* generate check for the bootloader to check on resume */
  59
  60                 for (ptr = 0; ptr < 0x40000; ptr += 0x400)
  61                         calc += __raw_readl(base+ptr);
  62
  63                 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
  64         }
  65
  66         /* RX3715 and RX1950 use similar to H1940 code and the
  67          * same offsets for resume and checksum pointers */
  68
  69         if (machine_is_rx3715() || machine_is_rx1950()) {
  70                 void *base = phys_to_virt(H1940_SUSPEND_CHECK);
  71                 unsigned long ptr;
  72                 unsigned long calc = 0;
  73
  74                 /* generate check for the bootloader to check on resume */
  75
  76                 for (ptr = 0; ptr < 0x40000; ptr += 0x4)
  77                         calc += __raw_readl(base+ptr);
  78
  79                 __raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
  80         }
  81
  82         if (machine_is_aml_m5900()) {
  83                 gpio_request_one(S3C2410_GPF(2), GPIOF_OUT_INIT_HIGH, NULL);
  84                 gpio_free(S3C2410_GPF(2));
  85         }
  86
  87         if (machine_is_rx1950()) {
  88                 /* According to S3C2442 user's manual, page 7-17,
  89                  * when the system is operating in NAND boot mode,
  90                  * the hardware pin configuration - EINT[23:21] –
  91                  * must be set as input for starting up after
  92                  * wakeup from sleep mode
  93                  */
  94                 s3c_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPIO_INPUT);
  95                 s3c_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPIO_INPUT);
  96                 s3c_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPIO_INPUT);
  97         }
  98 }
  99
 100 static void s3c2410_pm_resume(void)
 101 {
 102         unsigned long tmp;
 103
 104         /* unset the return-from-sleep flag, to ensure reset */
 105
 106         tmp = __raw_readl(S3C2410_GSTATUS2);
 107         tmp &= S3C2410_GSTATUS2_OFFRESET;
 108         __raw_writel(tmp, S3C2410_GSTATUS2);
 109
 110         if (machine_is_aml_m5900()) {
 111                 gpio_request_one(S3C2410_GPF(2), GPIOF_OUT_INIT_LOW, NULL);
 112                 gpio_free(S3C2410_GPF(2));
 113         }
 114 }
 115
 116 struct syscore_ops s3c2410_pm_syscore_ops = {
 117         .resume         = s3c2410_pm_resume,
 118 };
 119
 120 static int s3c2410_pm_add(struct device *dev, struct subsys_interface *sif)
 121 {
 122         pm_cpu_prep = s3c2410_pm_prepare;
 123         pm_cpu_sleep = s3c2410_cpu_suspend;
 124
 125         return 0;
 126 }
 127
 128 #if defined(CONFIG_CPU_S3C2410)
 129 static struct subsys_interface s3c2410_pm_interface = {
 130         .name           = "s3c2410_pm",
 131         .subsys         = &s3c2410_subsys,
 132         .add_dev        = s3c2410_pm_add,
 133 };
 134
 135 /* register ourselves */
 136
 137 static int __init s3c2410_pm_drvinit(void)
 138 {
 139         return subsys_interface_register(&s3c2410_pm_interface);
 140 }
 141
 142 arch_initcall(s3c2410_pm_drvinit);
 143
 144 static struct subsys_interface s3c2410a_pm_interface = {
 145         .name           = "s3c2410a_pm",
 146         .subsys         = &s3c2410a_subsys,
 147         .add_dev        = s3c2410_pm_add,
 148 };
 149
 150 static int __init s3c2410a_pm_drvinit(void)
 151 {
 152         return subsys_interface_register(&s3c2410a_pm_interface);
 153 }
 154
 155 arch_initcall(s3c2410a_pm_drvinit);
 156 #endif
 157
 158 #if defined(CONFIG_CPU_S3C2440)
 159 static struct subsys_interface s3c2440_pm_interface = {
 160         .name           = "s3c2440_pm",
 161         .subsys         = &s3c2440_subsys,
 162         .add_dev        = s3c2410_pm_add,
 163 };
 164
 165 static int __init s3c2440_pm_drvinit(void)
 166 {
 167         return subsys_interface_register(&s3c2440_pm_interface);
 168 }
 169
 170 arch_initcall(s3c2440_pm_drvinit);
 171 #endif
 172
 173 #if defined(CONFIG_CPU_S3C2442)
 174 static struct subsys_interface s3c2442_pm_interface = {
 175         .name           = "s3c2442_pm",
 176         .subsys         = &s3c2442_subsys,
 177         .add_dev        = s3c2410_pm_add,
 178 };
 179
 180 static int __init s3c2442_pm_drvinit(void)
 181 {
 182         return subsys_interface_register(&s3c2442_pm_interface);
 183 }
 184
 185 arch_initcall(s3c2442_pm_drvinit);
 186 #endif