LXR linux/arch/h8300/platform/h8s/edosk2674/crt0

   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 SYMBOL_NAME(_start)
  17        .global SYMBOL_NAME(_command_line)
  18        .global SYMBOL_NAME(_platform_gpio_table)
  19        .global SYMBOL_NAME(_target_name)
  20        
  21        .h8300s
  22        .section .text
  23        .file   "crt0_rom.S"
  24
  25        /* CPU Reset entry */
  26SYMBOL_NAME_LABEL(_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
  351:
  36        mov.w   @er0+,r2
  37        beq     2f
  38        mov.w   @er0+,r1
  39        mov.b   r1l,@er2
  40        bra     1b
  41
  422:
  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
  641:      
  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
  771:
  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   #SYMBOL_NAME(_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   #SYMBOL_NAME(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
 108init_regs:
 109INIT_REGS_DATA(ASTCR,0xff)
 110INIT_REGS_DATA(RDNCR,0x00)
 111INIT_REGS_DATA(ABWCR,0x80)
 112INIT_REGS_DATA(WTCRAH,0x27)
 113INIT_REGS_DATA(WTCRAL,0x77)
 114INIT_REGS_DATA(WTCRBH,0x71)
 115INIT_REGS_DATA(WTCRBL,0x22)
 116INIT_REGS_DATA(CSACRH,0x80)
 117INIT_REGS_DATA(CSACRL,0x80)
 118INIT_REGS_DATA(BROMCRH,0xa0)
 119INIT_REGS_DATA(BROMCRL,0xa0)
 120INIT_REGS_DATA(P3DDR,0x3a)
 121INIT_REGS_DATA(P3ODR,0x06)
 122INIT_REGS_DATA(PADDR,0xff)
 123INIT_REGS_DATA(PFDDR,0xfe)
 124INIT_REGS_DATA(PGDDR,0x0f)
 125INIT_REGS_DATA(PHDDR,0x0f)
 126INIT_REGS_DATA(PFCR0,0xff)
 127INIT_REGS_DATA(PFCR2,0x0d)
 128INIT_REGS_DATA(ITSR, 0x00)
 129INIT_REGS_DATA(ITSR+1,0x3f)
 130INIT_REGS_DATA(INTCR,0x20)
 131                
 132        .word   0
 133
 134gpio_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
 182vector  =       2
 183        .rept   126
 184        .long   _interrupt_redirect_table+vector*4
 185vector  =       vector + 1
 186        .endr
 187