arch/arm/mach-msm/idle.S

   1 /* arch/arm/mach-msm/include/mach/idle.S
   2  *
   3  * Idle processing for MSM7K - work around bugs with SWFI.
   4  *
   5  * Copyright (c) 2007 QUALCOMM Incorporated.
   6  * Copyright (C) 2007 Google, Inc.
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/linkage.h>
  20 #include <asm/assembler.h>
  21
  22 ENTRY(arch_idle)
  23 #ifdef CONFIG_MSM7X00A_IDLE
  24         mrc     p15, 0, r1, c1, c0, 0    /* read current CR    */
  25         bic     r0, r1, #(1 << 2)        /* clear dcache bit   */
  26         bic     r0, r0, #(1 << 12)       /* clear icache bit   */
  27         mcr     p15, 0, r0, c1, c0, 0    /* disable d/i cache  */
  28
  29         mov     r0, #0                   /* prepare wfi value  */
  30         mcr     p15, 0, r0, c7, c10, 0   /* flush the cache    */
  31         mcr     p15, 0, r0, c7, c10, 4   /* memory barrier     */
  32         mcr     p15, 0, r0, c7, c0, 4    /* wait for interrupt */
  33
  34         mcr     p15, 0, r1, c1, c0, 0    /* restore d/i cache  */
  35 #endif
  36         mov     pc, lr