LXR linux/arch/arm/boot/compressed/head-sharpsl.S

   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 * Husky (SL-C760), Tosa (SL-C6000), Spitz (SL-C3000),
  11 * Akita (SL-C1000) and Borzoi (SL-C3100).
  12 *
  13 */
  14
  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/* Check for TC6393 - if found we have a Tosa */
  27        ldr     r7, .TOSAID
  28        mov     r1, #0x10000000         @ Base address of TC6393 chip
  29        mov     r6, #0x03
  30        ldrh    r3, [r1, #8]            @ Load TC6393XB Revison: This is 0x0003
  31        cmp     r6, r3
  32        beq     .SHARPEND               @ Success -> tosa
  33
  34/* Check for pxa270 - if found, branch */
  35        mrc p15, 0, r4, c0, c0          @ Get Processor ID
  36        and     r4, r4, #0xffffff00
  37        ldr     r3, .PXA270ID
  38        cmp     r4, r3
  39        beq     .PXA270
  40
  41/* Check for w100 - if not found we have a Poodle */
  42        ldr     r1, .W100ADDR           @ Base address of w100 chip + regs offset
  43
  44        mov r6, #0x31                   @ Load Magic Init value
  45        str     r6, [r1, #0x280]        @ to SCRATCH_UMSK
  46        mov r5, #0x3000
  47.W100LOOP:
  48        subs r5, r5, #1
  49        bne .W100LOOP
  50        mov r6, #0x30                   @ Load 2nd Magic Init value
  51        str     r6, [r1, #0x280]        @ to SCRATCH_UMSK
  52
  53        ldr     r6, [r1, #0]            @ Load Chip ID
  54        ldr     r3, .W100ID
  55        ldr     r7, .POODLEID
  56        cmp     r6, r3
  57        bne     .SHARPEND                       @ We have no w100 - Poodle
  58
  59/* Check for pxa250 - if found we have a Corgi */
  60        ldr     r7, .CORGIID
  61        ldr     r3, .PXA255ID
  62        cmp     r4, r3
  63        blo     .SHARPEND                       @ We have a PXA250 - Corgi
  64
  65/* Check for 64MiB flash - if found we have a Shepherd */
  66        bl      get_flash_ids
  67        ldr     r7, .SHEPHERDID
  68        cmp     r3, #0x76                       @ 64MiB flash
  69        beq     .SHARPEND                       @ We have Shepherd
  70
  71/* Must be a Husky */
  72        ldr     r7, .HUSKYID            @ Must be Husky
  73        b .SHARPEND
  74
  75.PXA270:
  76/* Check for 16MiB flash - if found we have Spitz */
  77        bl      get_flash_ids
  78        ldr     r7, .SPITZID
  79        cmp     r3, #0x73                       @ 16MiB flash
  80        beq     .SHARPEND                       @ We have Spitz
  81
  82/* Check for a second SCOOP chip - if found we have Borzoi */
  83        ldr     r1, .SCOOP2ADDR
  84        ldr     r7, .BORZOIID
  85        mov     r6, #0x0140
  86        strh    r6, [r1]
  87        ldrh    r6, [r1]
  88        cmp     r6, #0x0140
  89        beq     .SHARPEND                       @ We have Borzoi
  90
  91/* Must be Akita */
  92        ldr     r7, .AKITAID
  93        b       .SHARPEND                       @ We have Borzoi
  94
  95.PXA255ID:
  96        .word   0x69052d00              @ PXA255 Processor ID
  97.PXA270ID:
  98        .word   0x69054100              @ PXA270 Processor ID
  99.W100ID:
 100        .word   0x57411002              @ w100 Chip ID
 101.W100ADDR:
 102        .word   0x08010000              @ w100 Chip ID Reg Address
 103.SCOOP2ADDR:
 104        .word   0x08800040
 105.POODLEID:
 106        .word   MACH_TYPE_POODLE
 107.CORGIID:
 108        .word   MACH_TYPE_CORGI
 109.SHEPHERDID:
 110        .word   MACH_TYPE_SHEPHERD
 111.HUSKYID:
 112        .word   MACH_TYPE_HUSKY
 113.TOSAID:
 114        .word   MACH_TYPE_TOSA
 115.SPITZID:
 116        .word   MACH_TYPE_SPITZ
 117.AKITAID:
 118        .word   MACH_TYPE_AKITA
 119.BORZOIID:
 120        .word   MACH_TYPE_BORZOI
 121
 122/*
 123 * Return: r2 - NAND Manufacturer ID
 124 *         r3 - NAND Chip ID
 125 * Corrupts: r1
 126 */
 127get_flash_ids:
 128        mov     r1, #0x0c000000         @ Base address of NAND chip
 129        ldrb    r3, [r1, #24]           @ Load FLASHCTL
 130        bic     r3, r3, #0x11           @ SET NCE
 131        orr     r3, r3, #0x0a           @ SET CLR + FLWP
 132        strb    r3, [r1, #24]           @ Save to FLASHCTL
 133        mov     r2, #0x90               @ Command "readid"
 134        strb    r2, [r1, #20]           @ Save to FLASHIO
 135        bic     r3, r3, #2              @ CLR CLE
 136        orr     r3, r3, #4              @ SET ALE
 137        strb    r3, [r1, #24]           @ Save to FLASHCTL
 138        mov     r2, #0                  @ Address 0x00
 139        strb    r2, [r1, #20]           @ Save to FLASHIO
 140        bic     r3, r3, #4              @ CLR ALE
 141        strb    r3, [r1, #24]           @ Save to FLASHCTL
 142.fids1:
 143        ldrb    r3, [r1, #24]           @ Load FLASHCTL
 144        tst     r3, #32                 @ Is chip ready?
 145        beq     .fids1
 146        ldrb    r2, [r1, #20]           @ NAND Manufacturer ID
 147        ldrb    r3, [r1, #20]           @ NAND Chip ID
 148        mov     pc, lr
 149
 150.SHARPEND:
 151