1/* 2 * SMP support for R-Mobile / SH-Mobile 3 * 4 * Copyright (C) 2010 Magnus Damm 5 * Copyright (C) 2010 Takashi Yoshii 6 * 7 * Based on vexpress, Copyright (c) 2003 ARM Limited, All Rights Reserved 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12 */ 13#include <linux/init.h> 14#include <linux/linkage.h> 15#include <linux/threads.h> 16#include <asm/assembler.h> 17#include <asm/memory.h> 18 19/* 20 * Reset vector for secondary CPUs. 21 * This will be mapped at address 0 by SBAR register. 22 * We need _long_ jump to the physical address. 23 */ 24 .arm 25 .align 12 26ENTRY(shmobile_boot_vector) 27 ldr r1, 1f 28 bx r1 29 30ENDPROC(shmobile_boot_vector) 31 32 .align 2 33 .globl shmobile_boot_fn 34shmobile_boot_fn: 351: .space 4 36 .globl shmobile_boot_size 37shmobile_boot_size: 38 .long . - shmobile_boot_vector 39 40/* 41 * Per-CPU SMP boot function/argument selection code based on MPIDR 42 */ 43 44ENTRY(shmobile_smp_boot) 45 mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR 46 and r0, r1, #0xffffff @ MPIDR_HWID_BITMASK 47 @ r0 = cpu_logical_map() value 48 mov r1, #0 @ r1 = CPU index 49 adr r2, 1f 50 ldmia r2, {r5, r6, r7} 51 add r5, r5, r2 @ array of per-cpu mpidr values 52 add r6, r6, r2 @ array of per-cpu functions 53 add r7, r7, r2 @ array of per-cpu arguments 54 55shmobile_smp_boot_find_mpidr: 56 ldr r8, [r5, r1, lsl #2] 57 cmp r8, r0 58 bne shmobile_smp_boot_next 59 60 ldr r9, [r6, r1, lsl #2] 61 cmp r9, #0 62 bne shmobile_smp_boot_found 63 64shmobile_smp_boot_next: 65 add r1, r1, #1 66 cmp r1, #NR_CPUS 67 blo shmobile_smp_boot_find_mpidr 68 69 b shmobile_smp_sleep 70 71shmobile_smp_boot_found: 72 ldr r0, [r7, r1, lsl #2] 73 ret r9 74ENDPROC(shmobile_smp_boot) 75 76ENTRY(shmobile_smp_sleep) 77 wfi 78 b shmobile_smp_boot 79ENDPROC(shmobile_smp_sleep) 80 81 .align 2 821: .long shmobile_smp_mpidr - . 83 .long shmobile_smp_fn - 1b 84 .long shmobile_smp_arg - 1b 85 86 .bss 87 .globl shmobile_smp_mpidr 88shmobile_smp_mpidr: 89 .space NR_CPUS * 4 90 .globl shmobile_smp_fn 91shmobile_smp_fn: 92 .space NR_CPUS * 4 93 .globl shmobile_smp_arg 94shmobile_smp_arg: 95 .space NR_CPUS * 4 96