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/*
* Copyright 2011 Freescale Semiconductor, Inc.
* Copyright 2011 Linaro Ltd.
*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/init.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/suspend.h>
#include <asm/cacheflush.h>
#include <asm/proc-fns.h>
#include <asm/suspend.h>
#include <asm/hardware/cache-l2x0.h>
#include "common.h"
#include "hardware.h"
extern unsigned long phys_l2x0_saved_regs;
static int imx6q_suspend_finish(unsigned long val)
{
cpu_do_idle();
return 0;
}
static int imx6q_pm_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
imx6q_set_lpm(STOP_POWER_OFF);
imx_gpc_pre_suspend();
imx_set_cpu_jump(0, v7_cpu_resume);
/* Zzz ... */
cpu_suspend(0, imx6q_suspend_finish);
imx_smp_prepare();
imx_gpc_post_resume();
imx6q_set_lpm(WAIT_CLOCKED);
break;
default:
return -EINVAL;
}
return 0;
}
static const struct platform_suspend_ops imx6q_pm_ops = {
.enter = imx6q_pm_enter,
.valid = suspend_valid_only_mem,
};
void __init imx6q_pm_init(void)
{
/*
* The l2x0 core code provides an infrastucture to save and restore
* l2x0 registers across suspend/resume cycle. But because imx6q
* retains L2 content during suspend and needs to resume L2 before
* MMU is enabled, it can only utilize register saving support and
* have to take care of restoring on its own. So we save physical
* address of the data structure used by l2x0 core to save registers,
* and later restore the necessary ones in imx6q resume entry.
*/
#ifdef CONFIG_CACHE_L2X0
phys_l2x0_saved_regs = __pa(&l2x0_saved_regs);
#endif
suspend_set_ops(&imx6q_pm_ops);
}
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