arch/arm/cpu/armv7/rmobile/lowlevel_init.S

   1 /*
   2  * Copyright (C) 2012 Nobuhiro Iwamatsu <nobuhiro.Iwamatsu.yj@renesas.com>
   3  * Copyright (C) 2012 Renesas Solutions Corp.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <config.h>
   9 #include <linux/linkage.h>
  10
  11 ENTRY(lowlevel_init)
  12         ldr             r0, =MERAM_BASE
  13         mov             r1, #0x0
  14         str             r1, [r0]
  15
  16         mrc             p15, 0, r0, c0, c0, 5
  17         ands    r0, r0, #0xF
  18         beq             lowlevel_init__
  19         b               wait_interrupt
  20
  21         .pool
  22         .align 4
  23
  24 wait_interrupt:
  25 #ifdef ICCICR
  26         ldr     r1, =ICCICR
  27         mov     r2, #0x0
  28         str     r2, [r1]
  29         mov     r2, #0xF0
  30         adds    r1, r1, #4 /* ICCPMR */
  31         str     r2, [r1]
  32         ldr     r1, =ICCICR
  33         mov     r2, #0x1
  34         str     r2, [r1]
  35 #endif
  36
  37 wait_loop:
  38         .long   0xE320F003 /* wfi */
  39
  40         ldr             r2, [r1, #0xC]
  41         str             r2, [r1, #0x10]
  42
  43         ldr             r0, =MERAM_BASE
  44         ldr             r2, [r0]
  45         cmp             r2, #0
  46         movne   pc, r2
  47
  48         b               wait_loop
  49
  50 wait_loop_end:
  51         .pool
  52         .align 4
  53
  54 lowlevel_init__:
  55
  56         mov r0, #0x200000
  57
  58 loop0:
  59         subs r0, r0, #1
  60         bne  loop0
  61
  62         ldr sp, MERAM_STACK
  63         b s_init
  64
  65         .pool
  66         .align 4
  67
  68 ENDPROC(lowlevel_init)
  69         .ltorg
  70
  71 MERAM_STACK:
  72         .word LOW_LEVEL_MERAM_STACK