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-rw-r--r--arch/arm/mach-msm/idle.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/idle.c b/arch/arm/mach-msm/idle.c
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+++ b/arch/arm/mach-msm/idle.c
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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);