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/* arch/arm/mach-msm/idle.c
*
* Idle processing for MSM7K - work around bugs with SWFI.
*
* Copyright (c) 2007 QUALCOMM Incorporated.
* Copyright (C) 2007 Google, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/init.h>
#include <asm/system.h>
static void msm_idle(void)
{
#ifdef CONFIG_MSM7X00A_IDLE
asm volatile (
"mrc p15, 0, r1, c1, c0, 0 /* read current CR */ \n\t"
"bic r0, r1, #(1 << 2) /* clear dcache bit */ \n\t"
"bic r0, r0, #(1 << 12) /* clear icache bit */ \n\t"
"mcr p15, 0, r0, c1, c0, 0 /* disable d/i cache */ \n\t"
"mov r0, #0 /* prepare wfi value */ \n\t"
"mcr p15, 0, r0, c7, c10, 0 /* flush the cache */ \n\t"
"mcr p15, 0, r0, c7, c10, 4 /* memory barrier */ \n\t"
"mcr p15, 0, r0, c7, c0, 4 /* wait for interrupt */ \n\t"
"mcr p15, 0, r1, c1, c0, 0 /* restore d/i cache */ \n\t"
: : : "r0","r1" );
#endif
}
static int __init msm_idle_init(void)
{
arm_pm_idle = msm_idle;
return 0;
}
arch_initcall(msm_idle_init);
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