| Brian Swetland | 3042102 | 2007-11-26 04:11:43 -0800 | [diff] [blame] | 1 | /* linux/include/asm-arm/arch-msm/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 |