74 lines
1.6 KiB
C
74 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
|
|
*
|
|
* 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/suspend.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/err.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <mach/system.h>
|
|
#include "crm_regs.h"
|
|
|
|
static struct clk *gpc_dvfs_clk;
|
|
|
|
static int mx5_suspend_enter(suspend_state_t state)
|
|
{
|
|
clk_enable(gpc_dvfs_clk);
|
|
switch (state) {
|
|
case PM_SUSPEND_MEM:
|
|
mx5_cpu_lp_set(STOP_POWER_OFF);
|
|
break;
|
|
case PM_SUSPEND_STANDBY:
|
|
mx5_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (state == PM_SUSPEND_MEM) {
|
|
local_flush_tlb_all();
|
|
flush_cache_all();
|
|
|
|
/*clear the EMPGC0/1 bits */
|
|
__raw_writel(0, MXC_SRPG_EMPGC0_SRPGCR);
|
|
__raw_writel(0, MXC_SRPG_EMPGC1_SRPGCR);
|
|
}
|
|
cpu_do_idle();
|
|
clk_disable(gpc_dvfs_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mx5_pm_valid(suspend_state_t state)
|
|
{
|
|
return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
|
|
}
|
|
|
|
static const struct platform_suspend_ops mx5_suspend_ops = {
|
|
.valid = mx5_pm_valid,
|
|
.enter = mx5_suspend_enter,
|
|
};
|
|
|
|
static int __init mx5_pm_init(void)
|
|
{
|
|
if (gpc_dvfs_clk == NULL)
|
|
gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
|
|
|
|
if (!IS_ERR(gpc_dvfs_clk)) {
|
|
if (cpu_is_mx51())
|
|
suspend_set_ops(&mx5_suspend_ops);
|
|
} else
|
|
return -EPERM;
|
|
|
|
return 0;
|
|
}
|
|
device_initcall(mx5_pm_init);
|