/* * linux/arch/arm/boot/compressed/head-sharpsl.S * * Copyright (C) 2004-2005 Richard Purdie * * 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 #include #include #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: