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/*
* arch/sh/kernel/cpu/sh4a/pm-sh_mobile.c
*
* Power management support code for SuperH Mobile
*
* Copyright (C) 2009 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/suspend.h>
#include <asm/suspend.h>
#include <asm/uaccess.h>
/*
* Sleep modes available on SuperH Mobile:
*
* Sleep mode is just plain "sleep" instruction
* Sleep Self-Refresh mode is above plus RAM put in Self-Refresh
* Standby Self-Refresh mode is above plus stopped clocks
*/
#define SUSP_MODE_SLEEP (SUSP_SH_SLEEP)
#define SUSP_MODE_SLEEP_SF (SUSP_SH_SLEEP | SUSP_SH_SF)
#define SUSP_MODE_STANDBY_SF (SUSP_SH_STANDBY | SUSP_SH_SF)
/*
* The following modes are not there yet:
*
* R-standby mode is unsupported, but will be added in the future
* U-standby mode is low priority since it needs bootloader hacks
*
* All modes should be tied in with cpuidle. But before that can
* happen we need to keep track of enabled hardware blocks so we
* can avoid entering sleep modes that stop clocks to hardware
* blocks that are in use even though the cpu core is idle.
*/
extern const unsigned char sh_mobile_standby[];
extern const unsigned int sh_mobile_standby_size;
static void sh_mobile_call_standby(unsigned long mode)
{
extern void *vbr_base;
void *onchip_mem = (void *)0xe5200000; /* ILRAM */
void (*standby_onchip_mem)(unsigned long) = onchip_mem;
/* Note: Wake up from sleep may generate exceptions!
* Setup VBR to point to on-chip ram if self-refresh is
* going to be used.
*/
if (mode & SUSP_SH_SF)
asm volatile("ldc %0, vbr" : : "r" (onchip_mem) : "memory");
/* Copy the assembly snippet to the otherwise ununsed ILRAM */
memcpy(onchip_mem, sh_mobile_standby, sh_mobile_standby_size);
wmb();
ctrl_barrier();
/* Let assembly snippet in on-chip memory handle the rest */
standby_onchip_mem(mode);
/* Put VBR back in System RAM again */
if (mode & SUSP_SH_SF)
asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
}
static int sh_pm_enter(suspend_state_t state)
{
local_irq_disable();
set_bl_bit();
sh_mobile_call_standby(SUSP_MODE_STANDBY_SF);
local_irq_disable();
clear_bl_bit();
return 0;
}
static struct platform_suspend_ops sh_pm_ops = {
.enter = sh_pm_enter,
.valid = suspend_valid_only_mem,
};
static int __init sh_pm_init(void)
{
suspend_set_ops(&sh_pm_ops);
return 0;
}
late_initcall(sh_pm_init);
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