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151 lines
3.5 KiB
151 lines
3.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* linux/arch/arm/boot/compressed/head-sharpsl.S |
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* |
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* Copyright (C) 2004-2005 Richard Purdie <rpurdie@rpsys.net> |
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* |
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* Sharp's bootloader doesn't pass any kind of machine ID |
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* so we have to figure out the machine for ourselves... |
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* |
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* Support for Poodle, Corgi (SL-C700), Shepherd (SL-C750) |
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* Husky (SL-C760), Tosa (SL-C6000), Spitz (SL-C3000), |
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* Akita (SL-C1000) and Borzoi (SL-C3100). |
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* |
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*/ |
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#include <linux/linkage.h> |
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#include <asm/mach-types.h> |
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#ifndef CONFIG_PXA_SHARPSL |
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#error What am I doing here... |
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#endif |
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.section ".start", "ax" |
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__SharpSL_start: |
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/* Check for TC6393 - if found we have a Tosa */ |
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ldr r7, .TOSAID |
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mov r1, #0x10000000 @ Base address of TC6393 chip |
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mov r6, #0x03 |
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ldrh r3, [r1, #8] @ Load TC6393XB Revison: This is 0x0003 |
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cmp r6, r3 |
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beq .SHARPEND @ Success -> tosa |
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/* Check for pxa270 - if found, branch */ |
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mrc p15, 0, r4, c0, c0 @ Get Processor ID |
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and r4, r4, #0xffffff00 |
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ldr r3, .PXA270ID |
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cmp r4, r3 |
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beq .PXA270 |
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/* Check for w100 - if not found we have a Poodle */ |
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ldr r1, .W100ADDR @ Base address of w100 chip + regs offset |
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mov r6, #0x31 @ Load Magic Init value |
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str r6, [r1, #0x280] @ to SCRATCH_UMSK |
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mov r5, #0x3000 |
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.W100LOOP: |
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subs r5, r5, #1 |
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bne .W100LOOP |
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mov r6, #0x30 @ Load 2nd Magic Init value |
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str r6, [r1, #0x280] @ to SCRATCH_UMSK |
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ldr r6, [r1, #0] @ Load Chip ID |
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ldr r3, .W100ID |
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ldr r7, .POODLEID |
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cmp r6, r3 |
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bne .SHARPEND @ We have no w100 - Poodle |
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/* Check for pxa250 - if found we have a Corgi */ |
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ldr r7, .CORGIID |
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ldr r3, .PXA255ID |
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cmp r4, r3 |
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blo .SHARPEND @ We have a PXA250 - Corgi |
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/* Check for 64MiB flash - if found we have a Shepherd */ |
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bl get_flash_ids |
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ldr r7, .SHEPHERDID |
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cmp r3, #0x76 @ 64MiB flash |
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beq .SHARPEND @ We have Shepherd |
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/* Must be a Husky */ |
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ldr r7, .HUSKYID @ Must be Husky |
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b .SHARPEND |
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.PXA270: |
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/* Check for 16MiB flash - if found we have Spitz */ |
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bl get_flash_ids |
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ldr r7, .SPITZID |
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cmp r3, #0x73 @ 16MiB flash |
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beq .SHARPEND @ We have Spitz |
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/* Check for a second SCOOP chip - if found we have Borzoi */ |
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ldr r1, .SCOOP2ADDR |
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ldr r7, .BORZOIID |
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mov r6, #0x0140 |
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strh r6, [r1] |
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ldrh r6, [r1] |
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cmp r6, #0x0140 |
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beq .SHARPEND @ We have Borzoi |
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/* Must be Akita */ |
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ldr r7, .AKITAID |
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b .SHARPEND @ We have Borzoi |
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.PXA255ID: |
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.word 0x69052d00 @ PXA255 Processor ID |
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.PXA270ID: |
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.word 0x69054100 @ PXA270 Processor ID |
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.W100ID: |
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.word 0x57411002 @ w100 Chip ID |
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.W100ADDR: |
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.word 0x08010000 @ w100 Chip ID Reg Address |
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.SCOOP2ADDR: |
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.word 0x08800040 |
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.POODLEID: |
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.word MACH_TYPE_POODLE |
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.CORGIID: |
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.word MACH_TYPE_CORGI |
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.SHEPHERDID: |
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.word MACH_TYPE_SHEPHERD |
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.HUSKYID: |
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.word MACH_TYPE_HUSKY |
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.TOSAID: |
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.word MACH_TYPE_TOSA |
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.SPITZID: |
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.word MACH_TYPE_SPITZ |
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.AKITAID: |
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.word MACH_TYPE_AKITA |
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.BORZOIID: |
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.word MACH_TYPE_BORZOI |
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/* |
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* Return: r2 - NAND Manufacturer ID |
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* r3 - NAND Chip ID |
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* Corrupts: r1 |
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*/ |
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get_flash_ids: |
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mov r1, #0x0c000000 @ Base address of NAND chip |
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ldrb r3, [r1, #24] @ Load FLASHCTL |
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bic r3, r3, #0x11 @ SET NCE |
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orr r3, r3, #0x0a @ SET CLR + FLWP |
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strb r3, [r1, #24] @ Save to FLASHCTL |
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mov r2, #0x90 @ Command "readid" |
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strb r2, [r1, #20] @ Save to FLASHIO |
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bic r3, r3, #2 @ CLR CLE |
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orr r3, r3, #4 @ SET ALE |
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strb r3, [r1, #24] @ Save to FLASHCTL |
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mov r2, #0 @ Address 0x00 |
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strb r2, [r1, #20] @ Save to FLASHIO |
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bic r3, r3, #4 @ CLR ALE |
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strb r3, [r1, #24] @ Save to FLASHCTL |
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.fids1: |
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ldrb r3, [r1, #24] @ Load FLASHCTL |
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tst r3, #32 @ Is chip ready? |
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beq .fids1 |
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ldrb r2, [r1, #20] @ NAND Manufacturer ID |
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ldrb r3, [r1, #20] @ NAND Chip ID |
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mov pc, lr |
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.SHARPEND:
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