/* linux/arch/arm/mach-s3c2410/s3c2410-pm.c
*
* Copyright (c) 2006 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* S3C2410 (and compatible) Power Manager (Suspend-To-RAM) support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/sysdev.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/mach-types.h>
#include <asm/arch/regs-gpio.h>
#include <asm/arch/h1940.h>
#include "cpu.h"
#include "pm.h"
#ifdef CONFIG_S3C2410_PM_DEBUG
extern void pm_dbg(const char *fmt, ...);
#define DBG(fmt...) pm_dbg(fmt)
#else
#define DBG(fmt...) printk(KERN_DEBUG fmt)
#endif
static void s3c2410_pm_prepare(void)
{
/* ensure at least GSTATUS3 has the resume address */
__raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3);
DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
if (machine_is_h1940()) {
void *base = phys_to_virt(H1940_SUSPEND_CHECK);
unsigned long ptr;
unsigned long calc = 0;
/* generate check for the bootloader to check on resume */
for (ptr = 0; ptr < 0x40000; ptr += 0x400)
calc += __raw_readl(base+ptr);
__raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
}
/* the RX3715 uses similar code and the same H1940 and the
* same offsets for resume and checksum pointers */
if (machine_is_rx3715()) {
void *base = phys_to_virt(H1940_SUSPEND_CHECK);
unsigned long ptr;
unsigned long calc = 0;
/* generate check for the bootloader to check on resume */
for (ptr = 0; ptr < 0x40000; ptr += 0x4)
calc += __raw_readl(base+ptr);
__raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
}
if ( machine_is_aml_m5900() )
s3c2410_gpio_setpin(S3C2410_GPF2, 1);
}
static int s3c2410_pm_resume(struct sys_device *dev)
{
unsigned long tmp;
/* unset the return-from-sleep flag, to ensure reset */
tmp = __raw_readl(S3C2410_GSTATUS2);
tmp &= S3C2410_GSTATUS2_OFFRESET;
__raw_writel(tmp, S3C2410_GSTATUS2);
if ( machine_is_aml_m5900() )
s3c2410_gpio_setpin(S3C2410_GPF2, 0);
return 0;
}
static int s3c2410_pm_add(struct sys_device *dev)
{
pm_cpu_prep = s3c2410_pm_prepare;
pm_cpu_sleep = s3c2410_cpu_suspend;
return 0;
}
#if defined(CONFIG_CPU_S3C2410)
static struct sysdev_driver s3c2410_pm_driver = {
.add = s3c2410_pm_add,
.resume = s3c2410_pm_resume,
};
/* register ourselves */
static int __init s3c2410_pm_drvinit(void)
{
return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
}
arch_initcall(s3c2410_pm_drvinit);
#endif
#if defined(CONFIG_CPU_S3C2440)
static struct sysdev_driver s3c2440_pm_driver = {
.add = s3c2410_pm_add,
.resume = s3c2410_pm_resume,
};
static int __init s3c2440_pm_drvinit(void)
{
return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
}
arch_initcall(s3c2440_pm_drvinit);
#endif
#if defined(CONFIG_CPU_S3C2442)
static struct sysdev_driver s3c2442_pm_driver = {
.add = s3c2410_pm_add,
.resume = s3c2410_pm_resume,
};
static int __init s3c2442_pm_drvinit(void)
{
return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
}
arch_initcall(s3c2442_pm_drvinit);
#endif
