| /* SPDX-License-Identifier: GPL-2.0 |
| * |
| * SMP support for R-Mobile / SH-Mobile |
| * |
| * Copyright (C) 2010 Magnus Damm |
| * Copyright (C) 2010 Takashi Yoshii |
| * |
| * Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved |
| */ |
| #include <linux/init.h> |
| #include <linux/linkage.h> |
| #include <linux/threads.h> |
| #include <asm/assembler.h> |
| #include <asm/page.h> |
| |
| #define SCTLR_MMU 0x01 |
| #define BOOTROM_ADDRESS 0xE6340000 |
| #define RWTCSRA_ADDRESS 0xE6020004 |
| #define RWTCSRA_WOVF 0x10 |
| |
| /* |
| * Reset vector for secondary CPUs. |
| * This will be mapped at address 0 by SBAR register. |
| * We need _long_ jump to the physical address. |
| */ |
| .arm |
| .align 12 |
| ENTRY(shmobile_boot_vector) |
| ldr r1, 1f |
| bx r1 |
| |
| ENDPROC(shmobile_boot_vector) |
| |
| .align 2 |
| .globl shmobile_boot_fn |
| shmobile_boot_fn: |
| 1: .space 4 |
| .globl shmobile_boot_size |
| shmobile_boot_size: |
| .long . - shmobile_boot_vector |
| |
| #ifdef CONFIG_ARCH_RCAR_GEN2 |
| /* |
| * Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs. |
| * This will be mapped at address 0 by SBAR register. |
| */ |
| ENTRY(shmobile_boot_vector_gen2) |
| mrc p15, 0, r0, c0, c0, 5 @ r0 = MPIDR |
| ldr r1, shmobile_boot_cpu_gen2 |
| cmp r0, r1 |
| bne shmobile_smp_continue_gen2 |
| |
| mrc p15, 0, r1, c1, c0, 0 @ r1 = SCTLR |
| and r0, r1, #SCTLR_MMU |
| cmp r0, #SCTLR_MMU |
| beq shmobile_smp_continue_gen2 |
| |
| ldr r0, rwtcsra |
| mov r1, #0 |
| ldrb r1, [r0] |
| and r0, r1, #RWTCSRA_WOVF |
| cmp r0, #RWTCSRA_WOVF |
| bne shmobile_smp_continue_gen2 |
| |
| ldr r0, bootrom |
| bx r0 |
| |
| shmobile_smp_continue_gen2: |
| ldr r1, shmobile_boot_fn_gen2 |
| bx r1 |
| |
| ENDPROC(shmobile_boot_vector_gen2) |
| |
| .align 4 |
| rwtcsra: |
| .word RWTCSRA_ADDRESS |
| bootrom: |
| .word BOOTROM_ADDRESS |
| .globl shmobile_boot_cpu_gen2 |
| shmobile_boot_cpu_gen2: |
| .word 0x00000000 |
| |
| .align 2 |
| .globl shmobile_boot_fn_gen2 |
| shmobile_boot_fn_gen2: |
| .space 4 |
| .globl shmobile_boot_size_gen2 |
| shmobile_boot_size_gen2: |
| .long . - shmobile_boot_vector_gen2 |
| #endif /* CONFIG_ARCH_RCAR_GEN2 */ |
| |
| /* |
| * Per-CPU SMP boot function/argument selection code based on MPIDR |
| */ |
| |
| ENTRY(shmobile_smp_boot) |
| mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR |
| and r0, r1, #0xffffff @ MPIDR_HWID_BITMASK |
| @ r0 = cpu_logical_map() value |
| mov r1, #0 @ r1 = CPU index |
| adr r2, 1f |
| ldmia r2, {r5, r6, r7} |
| add r5, r5, r2 @ array of per-cpu mpidr values |
| add r6, r6, r2 @ array of per-cpu functions |
| add r7, r7, r2 @ array of per-cpu arguments |
| |
| shmobile_smp_boot_find_mpidr: |
| ldr r8, [r5, r1, lsl #2] |
| cmp r8, r0 |
| bne shmobile_smp_boot_next |
| |
| ldr r9, [r6, r1, lsl #2] |
| cmp r9, #0 |
| bne shmobile_smp_boot_found |
| |
| shmobile_smp_boot_next: |
| add r1, r1, #1 |
| cmp r1, #NR_CPUS |
| blo shmobile_smp_boot_find_mpidr |
| |
| b shmobile_smp_sleep |
| |
| shmobile_smp_boot_found: |
| ldr r0, [r7, r1, lsl #2] |
| ret r9 |
| ENDPROC(shmobile_smp_boot) |
| |
| ENTRY(shmobile_smp_sleep) |
| wfi |
| b shmobile_smp_boot |
| ENDPROC(shmobile_smp_sleep) |
| |
| .align 2 |
| 1: .long shmobile_smp_mpidr - . |
| .long shmobile_smp_fn - 1b |
| .long shmobile_smp_arg - 1b |
| |
| .bss |
| .globl shmobile_smp_mpidr |
| shmobile_smp_mpidr: |
| .space NR_CPUS * 4 |
| .globl shmobile_smp_fn |
| shmobile_smp_fn: |
| .space NR_CPUS * 4 |
| .globl shmobile_smp_arg |
| shmobile_smp_arg: |
| .space NR_CPUS * 4 |
