1/* 2 * Shared SCU setup for mach-shmobile 3 * 4 * Copyright (C) 2012 Bastian Hecht 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17#include <linux/linkage.h> 18#include <linux/init.h> 19#include <asm/memory.h> 20 21/* 22 * Boot code for secondary CPUs. 23 * 24 * First we turn on L1 cache coherency for our CPU. Then we jump to 25 * secondary_startup that invalidates the cache and hands over control 26 * to the common ARM startup code. 27 */ 28ENTRY(shmobile_boot_scu) 29 @ r0 = SCU base address 30 mrc p15, 0, r1, c0, c0, 5 @ read MIPDR 31 and r1, r1, #3 @ mask out cpu ID 32 lsl r1, r1, #3 @ we will shift by cpu_id * 8 bits 33 ldr r2, [r0, #8] @ SCU Power Status Register 34 mov r3, #3 35 lsl r3, r3, r1 36 bic r2, r2, r3 @ Clear bits of our CPU (Run Mode) 37 str r2, [r0, #8] @ write back 38 39 b secondary_startup 40ENDPROC(shmobile_boot_scu) 41 42 .text 43 .align 2 44 .globl shmobile_scu_base 45shmobile_scu_base: 46 .space 4 47