| Magnus Damm | ec0d84a | 2013-02-13 22:47:07 +0900 | [diff] [blame^] | 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 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
| 19 | * MA 02111-1307 USA |
| 20 | */ |
| 21 | |
| 22 | #include <linux/linkage.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <asm/memory.h> |
| 25 | |
| 26 | __CPUINIT |
| 27 | /* |
| 28 | * Reset vector for secondary CPUs. |
| 29 | * |
| 30 | * First we turn on L1 cache coherency for our CPU. Then we jump to |
| 31 | * shmobile_invalidate_start that invalidates the cache and hands over control |
| 32 | * to the common ARM startup code. |
| 33 | * This function will be mapped to address 0 by the SBAR register. |
| 34 | * A normal branch is out of range here so we need a long jump. We jump to |
| 35 | * the physical address as the MMU is still turned off. |
| 36 | */ |
| 37 | .align 12 |
| 38 | ENTRY(shmobile_secondary_vector_scu) |
| 39 | mrc p15, 0, r0, c0, c0, 5 @ read MIPDR |
| 40 | and r0, r0, #3 @ mask out cpu ID |
| 41 | lsl r0, r0, #3 @ we will shift by cpu_id * 8 bits |
| 42 | mov r1, #0xf0000000 @ SCU base address |
| 43 | ldr r2, [r1, #8] @ SCU Power Status Register |
| 44 | mov r3, #3 |
| 45 | bic r2, r2, r3, lsl r0 @ Clear bits of our CPU (Run Mode) |
| 46 | str r2, [r1, #8] @ write back |
| 47 | |
| 48 | ldr pc, 1f |
| 49 | 1: .long shmobile_invalidate_start - PAGE_OFFSET + PLAT_PHYS_OFFSET |
| 50 | ENDPROC(shmobile_secondary_vector_scu) |