forked from Minki/linux
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
188 lines
3.1 KiB
ArmAsm
188 lines
3.1 KiB
ArmAsm
/*
|
|
* linux/arch/h8300/platform/h8s/edosk2674/crt0_rom.S
|
|
*
|
|
* Yoshinori Sato <ysato@users.sourceforge.jp>
|
|
*
|
|
* Platform depend startup
|
|
* Target Archtecture: EDOSK-2674
|
|
* Memory Layout : ROM
|
|
*/
|
|
|
|
#define ASSEMBLY
|
|
|
|
#include <linux/config.h>
|
|
#include <asm/linkage.h>
|
|
#include <asm/regs267x.h>
|
|
|
|
.global SYMBOL_NAME(_start)
|
|
.global SYMBOL_NAME(_command_line)
|
|
.global SYMBOL_NAME(_platform_gpio_table)
|
|
.global SYMBOL_NAME(_target_name)
|
|
|
|
.h8300s
|
|
.section .text
|
|
.file "crt0_rom.S"
|
|
|
|
/* CPU Reset entry */
|
|
SYMBOL_NAME_LABEL(_start)
|
|
mov.l #__ramend,sp
|
|
ldc #0x80,ccr
|
|
ldc #0,exr
|
|
|
|
/* Peripheral Setup */
|
|
;BSC/GPIO setup
|
|
mov.l #init_regs,er0
|
|
mov.w #0xffff,e2
|
|
1:
|
|
mov.w @er0+,r2
|
|
beq 2f
|
|
mov.w @er0+,r1
|
|
mov.b r1l,@er2
|
|
bra 1b
|
|
|
|
2:
|
|
;SDRAM setup
|
|
#define SDRAM_SMR 0x400040
|
|
|
|
mov.b #0,r0l
|
|
mov.b r0l,@DRACCR:16
|
|
mov.w #0x188,r0
|
|
mov.w r0,@REFCR:16
|
|
mov.w #0x85b4,r0
|
|
mov.w r0,@DRAMCR:16
|
|
mov.b #0,r1l
|
|
mov.b r1l,@SDRAM_SMR
|
|
mov.w #0x84b4,r0
|
|
mov.w r0,@DRAMCR:16
|
|
;special thanks to Arizona Cooperative Power
|
|
|
|
/* copy .data */
|
|
mov.l #__begin_data,er5
|
|
mov.l #__sdata,er6
|
|
mov.l #__edata,er4
|
|
sub.l er6,er4
|
|
shlr.l #2,er4
|
|
1:
|
|
mov.l @er5+,er0
|
|
mov.l er0,@er6
|
|
adds #4,er6
|
|
dec.l #1,er4
|
|
bne 1b
|
|
|
|
/* .bss clear */
|
|
mov.l #__sbss,er5
|
|
mov.l #__ebss,er4
|
|
sub.l er5,er4
|
|
shlr.l #2,er4
|
|
sub.l er0,er0
|
|
1:
|
|
mov.l er0,@er5
|
|
adds #4,er5
|
|
dec.l #1,er4
|
|
bne 1b
|
|
|
|
/* copy kernel commandline */
|
|
mov.l #COMMAND_START,er5
|
|
mov.l #SYMBOL_NAME(_command_line),er6
|
|
mov.w #512,r4
|
|
eepmov.w
|
|
|
|
/* linux kernel start */
|
|
ldc #0x90,ccr /* running kernel */
|
|
mov.l #SYMBOL_NAME(init_thread_union),sp
|
|
add.l #0x2000,sp
|
|
jsr @_start_kernel
|
|
_exit:
|
|
|
|
jmp _exit
|
|
|
|
rts
|
|
|
|
/* I/O port assign information */
|
|
__platform_gpio_table:
|
|
mov.l #gpio_table,er0
|
|
rts
|
|
|
|
#define INIT_REGS_DATA(REGS,DATA) \
|
|
.word ((REGS) & 0xffff),DATA
|
|
|
|
init_regs:
|
|
INIT_REGS_DATA(ASTCR,0xff)
|
|
INIT_REGS_DATA(RDNCR,0x00)
|
|
INIT_REGS_DATA(ABWCR,0x80)
|
|
INIT_REGS_DATA(WTCRAH,0x27)
|
|
INIT_REGS_DATA(WTCRAL,0x77)
|
|
INIT_REGS_DATA(WTCRBH,0x71)
|
|
INIT_REGS_DATA(WTCRBL,0x22)
|
|
INIT_REGS_DATA(CSACRH,0x80)
|
|
INIT_REGS_DATA(CSACRL,0x80)
|
|
INIT_REGS_DATA(BROMCRH,0xa0)
|
|
INIT_REGS_DATA(BROMCRL,0xa0)
|
|
INIT_REGS_DATA(P3DDR,0x3a)
|
|
INIT_REGS_DATA(P3ODR,0x06)
|
|
INIT_REGS_DATA(PADDR,0xff)
|
|
INIT_REGS_DATA(PFDDR,0xfe)
|
|
INIT_REGS_DATA(PGDDR,0x0f)
|
|
INIT_REGS_DATA(PHDDR,0x0f)
|
|
INIT_REGS_DATA(PFCR0,0xff)
|
|
INIT_REGS_DATA(PFCR2,0x0d)
|
|
INIT_REGS_DATA(ITSR, 0x00)
|
|
INIT_REGS_DATA(ITSR+1,0x3f)
|
|
INIT_REGS_DATA(INTCR,0x20)
|
|
|
|
.word 0
|
|
|
|
gpio_table:
|
|
;; P1DDR
|
|
.byte 0x00,0x00
|
|
;; P2DDR
|
|
.byte 0x00,0x00
|
|
;; P3DDR
|
|
.byte 0x00,0x00
|
|
;; dummy
|
|
.byte 0x00,0x00
|
|
;; P5DDR
|
|
.byte 0x00,0x00
|
|
;; P6DDR
|
|
.byte 0x00,0x00
|
|
;; P7DDR
|
|
.byte 0x00,0x00
|
|
;; P8DDR
|
|
.byte 0x00,0x00
|
|
;; dummy
|
|
.byte 0x00,0x00
|
|
;; PADDR
|
|
.byte 0x00,0x00
|
|
;; PBDDR
|
|
.byte 0x00,0x00
|
|
;; PCDDR
|
|
.byte 0x00,0x00
|
|
;; PDDDR
|
|
.byte 0x00,0x00
|
|
;; PEDDR
|
|
.byte 0x00,0x00
|
|
;; PFDDR
|
|
.byte 0x00,0x00
|
|
;; PGDDR
|
|
.byte 0x00,0x00
|
|
;; PHDDR
|
|
.byte 0x00,0x00
|
|
|
|
.section .rodata
|
|
__target_name:
|
|
.asciz "EDOSK-2674"
|
|
|
|
.section .bss
|
|
__command_line:
|
|
.space 512
|
|
|
|
/* interrupt vector */
|
|
.section .vectors,"ax"
|
|
.long __start
|
|
.long __start
|
|
vector = 2
|
|
.rept 126
|
|
.long _interrupt_redirect_table+vector*4
|
|
vector = vector + 1
|
|
.endr
|