blob: 2b1cb7f16943e7fbd39f61169e43f3f05e661601 [file] [log] [blame]
Brian Swetland30421022007-11-26 04:11:43 -08001/* 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
22ENTRY(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