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50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
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/* arch/arm/mach-msm/idle.c
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*
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* Idle processing for MSM7K - work around bugs with SWFI.
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*
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* Copyright (c) 2007 QUALCOMM Incorporated.
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* Copyright (C) 2007 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/init.h>
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#include <asm/system.h>
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static void msm_idle(void)
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{
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#ifdef CONFIG_MSM7X00A_IDLE
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asm volatile (
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"mrc p15, 0, r1, c1, c0, 0 /* read current CR */ \n\t"
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"bic r0, r1, #(1 << 2) /* clear dcache bit */ \n\t"
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"bic r0, r0, #(1 << 12) /* clear icache bit */ \n\t"
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"mcr p15, 0, r0, c1, c0, 0 /* disable d/i cache */ \n\t"
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"mov r0, #0 /* prepare wfi value */ \n\t"
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"mcr p15, 0, r0, c7, c10, 0 /* flush the cache */ \n\t"
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"mcr p15, 0, r0, c7, c10, 4 /* memory barrier */ \n\t"
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"mcr p15, 0, r0, c7, c0, 4 /* wait for interrupt */ \n\t"
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"mcr p15, 0, r1, c1, c0, 0 /* restore d/i cache */ \n\t"
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: : : "r0","r1" );
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#endif
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}
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static int __init msm_idle_init(void)
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{
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arm_pm_idle = msm_idle;
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return 0;
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}
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arch_initcall(msm_idle_init);
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