arch/arm/mach-shmobile/headsmp-scu.S

   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  * Boot code 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  */
  34 ENTRY(shmobile_boot_scu)
  35                                         @ r0 = SCU base address
  36         mrc     p15, 0, r1, c0, c0, 5   @ read MIPDR
  37         and     r1, r1, #3              @ mask out cpu ID
  38         lsl     r1, r1, #3              @ we will shift by cpu_id * 8 bits
  39         ldr     r2, [r0, #8]            @ SCU Power Status Register
  40         mov     r3, #3
  41         bic     r2, r2, r3, lsl r1      @ Clear bits of our CPU (Run Mode)
  42         str     r2, [r0, #8]            @ write back
  43
  44         b       shmobile_invalidate_start
  45 ENDPROC(shmobile_boot_scu)
  46
  47         .text
  48         .globl  shmobile_scu_base
  49 shmobile_scu_base:
  50         .space  4