| /* SPDX-License-Identifier: GPL-2.0+ */ |
| /* |
| * Copyright (c) 2013 Samsung Electronics Co., Ltd. |
| * http://www.samsung.com |
| * |
| * Exynos low-level resume code |
| */ |
| |
| #include <linux/linkage.h> |
| #include <asm/asm-offsets.h> |
| #include <asm/hardware/cache-l2x0.h> |
| #include "smc.h" |
| |
| #define CPU_MASK 0xff0ffff0 |
| #define CPU_CORTEX_A9 0x410fc090 |
| |
| .text |
| .align |
| |
| /* |
| * sleep magic, to allow the bootloader to check for an valid |
| * image to resume to. Must be the first word before the |
| * exynos_cpu_resume entry. |
| */ |
| |
| .word 0x2bedf00d |
| |
| /* |
| * exynos_cpu_resume |
| * |
| * resume code entry for bootloader to call |
| */ |
| |
| ENTRY(exynos_cpu_resume) |
| #ifdef CONFIG_CACHE_L2X0 |
| mrc p15, 0, r0, c0, c0, 0 |
| ldr r1, =CPU_MASK |
| and r0, r0, r1 |
| ldr r1, =CPU_CORTEX_A9 |
| cmp r0, r1 |
| bleq l2c310_early_resume |
| #endif |
| b cpu_resume |
| ENDPROC(exynos_cpu_resume) |
| |
| .align |
| |
| ENTRY(exynos_cpu_resume_ns) |
| mrc p15, 0, r0, c0, c0, 0 |
| ldr r1, =CPU_MASK |
| and r0, r0, r1 |
| ldr r1, =CPU_CORTEX_A9 |
| cmp r0, r1 |
| bne skip_cp15 |
| |
| adr r0, _cp15_save_power |
| ldr r1, [r0] |
| ldr r1, [r0, r1] |
| adr r0, _cp15_save_diag |
| ldr r2, [r0] |
| ldr r2, [r0, r2] |
| mov r0, #SMC_CMD_C15RESUME |
| dsb |
| smc #0 |
| #ifdef CONFIG_CACHE_L2X0 |
| adr r0, 1f |
| ldr r2, [r0] |
| add r0, r2, r0 |
| |
| /* Check that the address has been initialised. */ |
| ldr r1, [r0, #L2X0_R_PHY_BASE] |
| teq r1, #0 |
| beq skip_l2x0 |
| |
| /* Check if controller has been enabled. */ |
| ldr r2, [r1, #L2X0_CTRL] |
| tst r2, #0x1 |
| bne skip_l2x0 |
| |
| ldr r1, [r0, #L2X0_R_TAG_LATENCY] |
| ldr r2, [r0, #L2X0_R_DATA_LATENCY] |
| ldr r3, [r0, #L2X0_R_PREFETCH_CTRL] |
| mov r0, #SMC_CMD_L2X0SETUP1 |
| smc #0 |
| |
| /* Reload saved regs pointer because smc corrupts registers. */ |
| adr r0, 1f |
| ldr r2, [r0] |
| add r0, r2, r0 |
| |
| ldr r1, [r0, #L2X0_R_PWR_CTRL] |
| ldr r2, [r0, #L2X0_R_AUX_CTRL] |
| mov r0, #SMC_CMD_L2X0SETUP2 |
| smc #0 |
| |
| mov r0, #SMC_CMD_L2X0INVALL |
| smc #0 |
| |
| mov r1, #1 |
| mov r0, #SMC_CMD_L2X0CTRL |
| smc #0 |
| skip_l2x0: |
| #endif /* CONFIG_CACHE_L2X0 */ |
| skip_cp15: |
| b cpu_resume |
| ENDPROC(exynos_cpu_resume_ns) |
| |
| .align |
| _cp15_save_power: |
| .long cp15_save_power - . |
| _cp15_save_diag: |
| .long cp15_save_diag - . |
| #ifdef CONFIG_CACHE_L2X0 |
| 1: .long l2x0_saved_regs - . |
| #endif /* CONFIG_CACHE_L2X0 */ |
| |
| .data |
| .align 2 |
| .globl cp15_save_diag |
| cp15_save_diag: |
| .long 0 @ cp15 diagnostic |
| .globl cp15_save_power |
| cp15_save_power: |
| .long 0 @ cp15 power control |