| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/boot/compressed/head-sharpsl.S |
| 3 | * |
| 4 | * Copyright (C) 2004-2005 Richard Purdie <rpurdie@rpsys.net> |
| 5 | * |
| 6 | * Sharp's bootloader doesn't pass any kind of machine ID |
| 7 | * so we have to figure out the machine for ourselves... |
| 8 | * |
| 9 | * Support for Poodle, Corgi (SL-C700), Shepherd (SL-C750) |
| 10 | * and Husky (SL-C760). |
| 11 | * |
| 12 | */ |
| 13 | |
| 14 | #include <linux/config.h> |
| 15 | #include <linux/linkage.h> |
| 16 | #include <asm/mach-types.h> |
| 17 | |
| 18 | #ifndef CONFIG_PXA_SHARPSL |
| 19 | #error What am I doing here... |
| 20 | #endif |
| 21 | |
| 22 | .section ".start", "ax" |
| 23 | |
| 24 | __SharpSL_start: |
| 25 | |
| 26 | ldr r1, .W100ADDR @ Base address of w100 chip + regs offset |
| 27 | |
| 28 | mov r6, #0x31 @ Load Magic Init value |
| 29 | str r6, [r1, #0x280] @ to SCRATCH_UMSK |
| 30 | mov r5, #0x3000 |
| 31 | .W100LOOP: |
| 32 | subs r5, r5, #1 |
| 33 | bne .W100LOOP |
| 34 | mov r6, #0x30 @ Load 2nd Magic Init value |
| 35 | str r6, [r1, #0x280] @ to SCRATCH_UMSK |
| 36 | |
| 37 | ldr r6, [r1, #0] @ Load Chip ID |
| 38 | ldr r3, .W100ID |
| 39 | ldr r7, .POODLEID |
| 40 | cmp r6, r3 |
| 41 | bne .SHARPEND @ We have no w100 - Poodle |
| 42 | |
| 43 | mrc p15, 0, r6, c0, c0 @ Get Processor ID |
| 44 | and r6, r6, #0xffffff00 |
| 45 | ldr r7, .CORGIID |
| 46 | ldr r3, .PXA255ID |
| 47 | cmp r6, r3 |
| 48 | blo .SHARPEND @ We have a PXA250 - Corgi |
| 49 | |
| 50 | mov r1, #0x0c000000 @ Base address of NAND chip |
| 51 | ldrb r3, [r1, #24] @ Load FLASHCTL |
| 52 | bic r3, r3, #0x11 @ SET NCE |
| 53 | orr r3, r3, #0x0a @ SET CLR + FLWP |
| 54 | strb r3, [r1, #24] @ Save to FLASHCTL |
| 55 | mov r2, #0x90 @ Command "readid" |
| 56 | strb r2, [r1, #20] @ Save to FLASHIO |
| 57 | bic r3, r3, #2 @ CLR CLE |
| 58 | orr r3, r3, #4 @ SET ALE |
| 59 | strb r3, [r1, #24] @ Save to FLASHCTL |
| 60 | mov r2, #0 @ Address 0x00 |
| 61 | strb r2, [r1, #20] @ Save to FLASHIO |
| 62 | bic r3, r3, #4 @ CLR ALE |
| 63 | strb r3, [r1, #24] @ Save to FLASHCTL |
| 64 | .SHARP1: |
| 65 | ldrb r3, [r1, #24] @ Load FLASHCTL |
| 66 | tst r3, #32 @ Is chip ready? |
| 67 | beq .SHARP1 |
| 68 | ldrb r2, [r1, #20] @ NAND Manufacturer ID |
| 69 | ldrb r3, [r1, #20] @ NAND Chip ID |
| 70 | ldr r7, .SHEPHERDID |
| 71 | cmp r3, #0x76 @ 64MiB flash |
| 72 | beq .SHARPEND @ We have Shepherd |
| 73 | ldr r7, .HUSKYID @ Must be Husky |
| 74 | b .SHARPEND |
| 75 | |
| 76 | .PXA255ID: |
| 77 | .word 0x69052d00 @ PXA255 Processor ID |
| 78 | .W100ID: |
| 79 | .word 0x57411002 @ w100 Chip ID |
| 80 | .W100ADDR: |
| 81 | .word 0x08010000 @ w100 Chip ID Reg Address |
| 82 | .POODLEID: |
| 83 | .word MACH_TYPE_POODLE |
| 84 | .CORGIID: |
| 85 | .word MACH_TYPE_CORGI |
| 86 | .SHEPHERDID: |
| 87 | .word MACH_TYPE_SHEPHERD |
| 88 | .HUSKYID: |
| 89 | .word MACH_TYPE_HUSKY |
| 90 | .SHARPEND: |
| 91 | |
| 92 | |