1/* 2 * Copyright (c) 2013 Samsung Electronics Co., Ltd. 3 * http://www.samsung.com 4 * 5 * Exynos low-level resume code 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 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#include <linux/linkage.h> 19 20#define CPU_MASK 0xff0ffff0 21#define CPU_CORTEX_A9 0x410fc090 22 23 /* 24 * The following code is located into the .data section. This is to 25 * allow l2x0_regs_phys to be accessed with a relative load while we 26 * can't rely on any MMU translation. We could have put l2x0_regs_phys 27 * in the .text section as well, but some setups might insist on it to 28 * be truly read-only. (Reference from: arch/arm/kernel/sleep.S) 29 */ 30 .data 31 .align 32 33 /* 34 * sleep magic, to allow the bootloader to check for an valid 35 * image to resume to. Must be the first word before the 36 * exynos_cpu_resume entry. 37 */ 38 39 .word 0x2bedf00d 40 41 /* 42 * exynos_cpu_resume 43 * 44 * resume code entry for bootloader to call 45 */ 46 47ENTRY(exynos_cpu_resume) 48#ifdef CONFIG_CACHE_L2X0 49 mrc p15, 0, r0, c0, c0, 0 50 ldr r1, =CPU_MASK 51 and r0, r0, r1 52 ldr r1, =CPU_CORTEX_A9 53 cmp r0, r1 54 bleq l2c310_early_resume 55#endif 56 b cpu_resume 57ENDPROC(exynos_cpu_resume) 58