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 r0, 2f 28 ldr r1, 1f 29 bx r1 30 31ENDPROC(shmobile_boot_vector) 32 33 .align 2 34 .globl shmobile_boot_fn 35shmobile_boot_fn: 361: .space 4 37 .globl shmobile_boot_arg 38shmobile_boot_arg: 392: .space 4 40 .globl shmobile_boot_size 41shmobile_boot_size: 42 .long . - shmobile_boot_vector 43 44/* 45 * Per-CPU SMP boot function/argument selection code based on MPIDR 46 */ 47 48ENTRY(shmobile_smp_boot) 49 @ r0 = MPIDR_HWID_BITMASK 50 mrc p15, 0, r1, c0, c0, 5 @ r1 = MPIDR 51 and r0, r1, r0 @ r0 = cpu_logical_map() value 52 mov r1, #0 @ r1 = CPU index 53 adr r5, 1f @ array of per-cpu mpidr values 54 adr r6, 2f @ array of per-cpu functions 55 adr r7, 3f @ array of per-cpu arguments 56 57shmobile_smp_boot_find_mpidr: 58 ldr r8, [r5, r1, lsl #2] 59 cmp r8, r0 60 bne shmobile_smp_boot_next 61 62 ldr r9, [r6, r1, lsl #2] 63 cmp r9, #0 64 bne shmobile_smp_boot_found 65 66shmobile_smp_boot_next: 67 add r1, r1, #1 68 cmp r1, #NR_CPUS 69 blo shmobile_smp_boot_find_mpidr 70 71 b shmobile_smp_sleep 72 73shmobile_smp_boot_found: 74 ldr r0, [r7, r1, lsl #2] 75 ret r9 76ENDPROC(shmobile_smp_boot) 77 78ENTRY(shmobile_smp_sleep) 79 wfi 80 b shmobile_smp_boot 81ENDPROC(shmobile_smp_sleep) 82 83 .globl shmobile_smp_mpidr 84shmobile_smp_mpidr: 851: .space NR_CPUS * 4 86 .globl shmobile_smp_fn 87shmobile_smp_fn: 882: .space NR_CPUS * 4 89 .globl shmobile_smp_arg 90shmobile_smp_arg: 913: .space NR_CPUS * 4 92