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/*
* linux/arch/arm/boot/compressed/head-sharpsl.S
*
* Copyright (C) 2004-2005 Richard Purdie <rpurdie@rpsys.net>
*
* Sharp's bootloader doesn't pass any kind of machine ID
* so we have to figure out the machine for ourselves...
*
* Support for Poodle, Corgi (SL-C700), Shepherd (SL-C750)
* and Husky (SL-C760).
*
*/
#include <linux/config.h>
#include <linux/linkage.h>
#include <asm/mach-types.h>
#ifndef CONFIG_PXA_SHARPSL
#error What am I doing here...
#endif
.section ".start", "ax"
__SharpSL_start:
ldr r1, .W100ADDR @ Base address of w100 chip + regs offset
mov r6, #0x31 @ Load Magic Init value
str r6, [r1, #0x280] @ to SCRATCH_UMSK
mov r5, #0x3000
.W100LOOP:
subs r5, r5, #1
bne .W100LOOP
mov r6, #0x30 @ Load 2nd Magic Init value
str r6, [r1, #0x280] @ to SCRATCH_UMSK
ldr r6, [r1, #0] @ Load Chip ID
ldr r3, .W100ID
ldr r7, .POODLEID
cmp r6, r3
bne .SHARPEND @ We have no w100 - Poodle
mrc p15, 0, r6, c0, c0 @ Get Processor ID
and r6, r6, #0xffffff00
ldr r7, .CORGIID
ldr r3, .PXA255ID
cmp r6, r3
blo .SHARPEND @ We have a PXA250 - Corgi
mov r1, #0x0c000000 @ Base address of NAND chip
ldrb r3, [r1, #24] @ Load FLASHCTL
bic r3, r3, #0x11 @ SET NCE
orr r3, r3, #0x0a @ SET CLR + FLWP
strb r3, [r1, #24] @ Save to FLASHCTL
mov r2, #0x90 @ Command "readid"
strb r2, [r1, #20] @ Save to FLASHIO
bic r3, r3, #2 @ CLR CLE
orr r3, r3, #4 @ SET ALE
strb r3, [r1, #24] @ Save to FLASHCTL
mov r2, #0 @ Address 0x00
strb r2, [r1, #20] @ Save to FLASHIO
bic r3, r3, #4 @ CLR ALE
strb r3, [r1, #24] @ Save to FLASHCTL
.SHARP1:
ldrb r3, [r1, #24] @ Load FLASHCTL
tst r3, #32 @ Is chip ready?
beq .SHARP1
ldrb r2, [r1, #20] @ NAND Manufacturer ID
ldrb r3, [r1, #20] @ NAND Chip ID
ldr r7, .SHEPHERDID
cmp r3, #0x76 @ 64MiB flash
beq .SHARPEND @ We have Shepherd
ldr r7, .HUSKYID @ Must be Husky
b .SHARPEND
.PXA255ID:
.word 0x69052d00 @ PXA255 Processor ID
.W100ID:
.word 0x57411002 @ w100 Chip ID
.W100ADDR:
.word 0x08010000 @ w100 Chip ID Reg Address
.POODLEID:
.word MACH_TYPE_POODLE
.CORGIID:
.word MACH_TYPE_CORGI
.SHEPHERDID:
.word MACH_TYPE_SHEPHERD
.HUSKYID:
.word MACH_TYPE_HUSKY
.SHARPEND:
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