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