| Nobuhiro Iwamatsu | 4dc515a | 2016-04-01 03:51:34 +0900 | [diff] [blame] | 1 | /* |
| 2 | * arch/arm/cpu/armv8/rcar_gen3/lowlevel_init.S |
| 3 | * This file is lowlevel initialize routine. |
| 4 | * |
| 5 | * (C) Copyright 2015 Renesas Electronics Corporation |
| 6 | * |
| 7 | * This file is based on the arch/arm/cpu/armv8/start.S |
| 8 | * |
| 9 | * (C) Copyright 2013 |
| 10 | * David Feng <fenghua@phytium.com.cn> |
| 11 | * |
| 12 | * SPDX-License-Identifier: GPL-2.0+ |
| 13 | */ |
| 14 | |
| 15 | #include <asm-offsets.h> |
| 16 | #include <config.h> |
| 17 | #include <linux/linkage.h> |
| 18 | #include <asm/macro.h> |
| 19 | |
| 20 | ENTRY(lowlevel_init) |
| 21 | mov x29, lr /* Save LR */ |
| 22 | |
| 23 | #ifndef CONFIG_ARMV8_MULTIENTRY |
| 24 | /* |
| 25 | * For single-entry systems the lowlevel init is very simple. |
| 26 | */ |
| 27 | ldr x0, =GICD_BASE |
| 28 | bl gic_init_secure |
| 29 | |
| 30 | #else /* CONFIG_ARMV8_MULTIENTRY is set */ |
| 31 | |
| 32 | #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3) |
| 33 | branch_if_slave x0, 1f |
| 34 | ldr x0, =GICD_BASE |
| 35 | bl gic_init_secure |
| 36 | 1: |
| 37 | #if defined(CONFIG_GICV3) |
| 38 | ldr x0, =GICR_BASE |
| 39 | bl gic_init_secure_percpu |
| 40 | #elif defined(CONFIG_GICV2) |
| 41 | ldr x0, =GICD_BASE |
| 42 | ldr x1, =GICC_BASE |
| 43 | bl gic_init_secure_percpu |
| 44 | #endif |
| 45 | #endif |
| 46 | |
| 47 | branch_if_master x0, x1, 2f |
| 48 | |
| 49 | /* |
| 50 | * Slave should wait for master clearing spin table. |
| 51 | * This sync prevent salves observing incorrect |
| 52 | * value of spin table and jumping to wrong place. |
| 53 | */ |
| 54 | #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3) |
| 55 | #ifdef CONFIG_GICV2 |
| 56 | ldr x0, =GICC_BASE |
| 57 | #endif |
| 58 | bl gic_wait_for_interrupt |
| 59 | #endif |
| 60 | |
| 61 | /* |
| 62 | * All slaves will enter EL2 and optionally EL1. |
| 63 | */ |
| Alison Wang | 73818d5 | 2016-11-10 10:49:03 +0800 | [diff] [blame] | 64 | adr x3, lowlevel_in_el2 |
| 65 | ldr x4, =ES_TO_AARCH64 |
| Nobuhiro Iwamatsu | 4dc515a | 2016-04-01 03:51:34 +0900 | [diff] [blame] | 66 | bl armv8_switch_to_el2 |
| Alison Wang | 73818d5 | 2016-11-10 10:49:03 +0800 | [diff] [blame] | 67 | |
| 68 | lowlevel_in_el2: |
| Nobuhiro Iwamatsu | 4dc515a | 2016-04-01 03:51:34 +0900 | [diff] [blame] | 69 | #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 |
| Alison Wang | 73818d5 | 2016-11-10 10:49:03 +0800 | [diff] [blame] | 70 | adr x3, lowlevel_in_el1 |
| 71 | ldr x4, =ES_TO_AARCH64 |
| Nobuhiro Iwamatsu | 4dc515a | 2016-04-01 03:51:34 +0900 | [diff] [blame] | 72 | bl armv8_switch_to_el1 |
| Nobuhiro Iwamatsu | 4dc515a | 2016-04-01 03:51:34 +0900 | [diff] [blame] | 73 | |
| Alison Wang | 73818d5 | 2016-11-10 10:49:03 +0800 | [diff] [blame] | 74 | lowlevel_in_el1: |
| 75 | #endif |
| Nobuhiro Iwamatsu | 4dc515a | 2016-04-01 03:51:34 +0900 | [diff] [blame] | 76 | #endif /* CONFIG_ARMV8_MULTIENTRY */ |
| 77 | |
| 78 | bl s_init |
| 79 | |
| 80 | 2: |
| 81 | mov lr, x29 /* Restore LR */ |
| 82 | ret |
| 83 | ENDPROC(lowlevel_init) |