arch/h8300/platform/h8s/edosk2674/crt0_rom.S

   1 /*
   2  *  linux/arch/h8300/platform/h8s/edosk2674/crt0_rom.S
   3  *
   4  *  Yoshinori Sato <ysato@users.sourceforge.jp>
   5  *
   6  *  Platform depend startup
   7  *  Target Archtecture: EDOSK-2674
   8  *  Memory Layout     : ROM
   9  */
  10
  11 #define ASSEMBLY
  12
  13 #include <asm/linkage.h>
  14 #include <asm/regs267x.h>
  15
  16         .global __start
  17         .global __command_line
  18         .global __platform_gpio_table
  19         .global __target_name
  20
  21         .h8300s
  22         .section .text
  23         .file   "crt0_rom.S"
  24
  25         /* CPU Reset entry */
  26 __start:
  27         mov.l   #__ramend,sp
  28         ldc     #0x80,ccr
  29         ldc     #0,exr
  30
  31         /* Peripheral Setup */
  32 ;BSC/GPIO setup
  33         mov.l   #init_regs,er0
  34         mov.w   #0xffff,e2
  35 1:
  36         mov.w   @er0+,r2
  37         beq     2f
  38         mov.w   @er0+,r1
  39         mov.b   r1l,@er2
  40         bra     1b
  41
  42 2:
  43 ;SDRAM setup
  44 #define SDRAM_SMR 0x400040
  45
  46         mov.b   #0,r0l
  47         mov.b   r0l,@DRACCR:16
  48         mov.w   #0x188,r0
  49         mov.w   r0,@REFCR:16
  50         mov.w   #0x85b4,r0
  51         mov.w   r0,@DRAMCR:16
  52         mov.b   #0,r1l
  53         mov.b   r1l,@SDRAM_SMR
  54         mov.w   #0x84b4,r0
  55         mov.w   r0,@DRAMCR:16
  56 ;special thanks to Arizona Cooperative Power
  57
  58         /* copy .data */
  59         mov.l   #__begin_data,er5
  60         mov.l   #__sdata,er6
  61         mov.l   #__edata,er4
  62         sub.l   er6,er4
  63         shlr.l  #2,er4
  64 1:
  65         mov.l   @er5+,er0
  66         mov.l   er0,@er6
  67         adds    #4,er6
  68         dec.l   #1,er4
  69         bne     1b
  70
  71         /* .bss clear */
  72         mov.l   #__sbss,er5
  73         mov.l   #__ebss,er4
  74         sub.l   er5,er4
  75         shlr.l  #2,er4
  76         sub.l   er0,er0
  77 1:
  78         mov.l   er0,@er5
  79         adds    #4,er5
  80         dec.l   #1,er4
  81         bne     1b
  82
  83         /* copy kernel commandline */
  84         mov.l   #COMMAND_START,er5
  85         mov.l   #__command_line,er6
  86         mov.w   #512,r4
  87         eepmov.w
  88
  89         /* linux kernel start */
  90         ldc     #0x90,ccr       /* running kernel */
  91         mov.l   #_init_thread_union,sp
  92         add.l   #0x2000,sp
  93         jsr     @_start_kernel
  94 _exit:
  95
  96         jmp     _exit
  97
  98         rts
  99
 100         /* I/O port assign information */
 101 __platform_gpio_table:
 102         mov.l   #gpio_table,er0
 103         rts
 104
 105 #define INIT_REGS_DATA(REGS,DATA) \
 106         .word   ((REGS) & 0xffff),DATA
 107
 108 init_regs:
 109 INIT_REGS_DATA(ASTCR,0xff)
 110 INIT_REGS_DATA(RDNCR,0x00)
 111 INIT_REGS_DATA(ABWCR,0x80)
 112 INIT_REGS_DATA(WTCRAH,0x27)
 113 INIT_REGS_DATA(WTCRAL,0x77)
 114 INIT_REGS_DATA(WTCRBH,0x71)
 115 INIT_REGS_DATA(WTCRBL,0x22)
 116 INIT_REGS_DATA(CSACRH,0x80)
 117 INIT_REGS_DATA(CSACRL,0x80)
 118 INIT_REGS_DATA(BROMCRH,0xa0)
 119 INIT_REGS_DATA(BROMCRL,0xa0)
 120 INIT_REGS_DATA(P3DDR,0x3a)
 121 INIT_REGS_DATA(P3ODR,0x06)
 122 INIT_REGS_DATA(PADDR,0xff)
 123 INIT_REGS_DATA(PFDDR,0xfe)
 124 INIT_REGS_DATA(PGDDR,0x0f)
 125 INIT_REGS_DATA(PHDDR,0x0f)
 126 INIT_REGS_DATA(PFCR0,0xff)
 127 INIT_REGS_DATA(PFCR2,0x0d)
 128 INIT_REGS_DATA(ITSR, 0x00)
 129 INIT_REGS_DATA(ITSR+1,0x3f)
 130 INIT_REGS_DATA(INTCR,0x20)
 131
 132         .word   0
 133
 134 gpio_table:
 135         ;; P1DDR
 136         .byte   0x00,0x00
 137         ;; P2DDR
 138         .byte   0x00,0x00
 139         ;; P3DDR
 140         .byte   0x00,0x00
 141         ;; dummy
 142         .byte   0x00,0x00
 143         ;; P5DDR
 144         .byte   0x00,0x00
 145         ;; P6DDR
 146         .byte   0x00,0x00
 147         ;; P7DDR
 148         .byte   0x00,0x00
 149         ;; P8DDR
 150         .byte   0x00,0x00
 151         ;; dummy
 152         .byte   0x00,0x00
 153         ;; PADDR
 154         .byte   0x00,0x00
 155         ;; PBDDR
 156         .byte   0x00,0x00
 157         ;; PCDDR
 158         .byte   0x00,0x00
 159         ;; PDDDR
 160         .byte   0x00,0x00
 161         ;; PEDDR
 162         .byte   0x00,0x00
 163         ;; PFDDR
 164         .byte   0x00,0x00
 165         ;; PGDDR
 166         .byte   0x00,0x00
 167         ;; PHDDR
 168         .byte   0x00,0x00
 169
 170         .section .rodata
 171 __target_name:
 172         .asciz  "EDOSK-2674"
 173
 174         .section .bss
 175 __command_line:
 176         .space  512
 177
 178         /* interrupt vector */
 179         .section .vectors,"ax"
 180         .long   __start
 181         .long   __start
 182 vector  =       2
 183         .rept   126
 184         .long   _interrupt_redirect_table+vector*4
 185 vector  =       vector + 1
 186         .endr