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

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * linux/arch/arm/boot/compressed/head-sharpsl.S
   4 *
   5 * Copyright (C) 2004-2005 Richard Purdie <rpurdie@rpsys.net>
   6 *
   7 * Sharp's bootloader doesn't pass any kind of machine ID
   8 * so we have to figure out the machine for ourselves...
   9 *
  10 * Support for Poodle, Corgi (SL-C700), Shepherd (SL-C750)
  11 * Husky (SL-C760), Tosa (SL-C6000), Spitz (SL-C3000),
  12 * Akita (SL-C1000) and Borzoi (SL-C3100).
  13 *
  14 */
  15
  16#include <linux/linkage.h>
  17#include <asm/mach-types.h>
  18
  19#ifndef CONFIG_PXA_SHARPSL
  20#error What am I doing here...
  21#endif
  22
  23                .section        ".start", "ax"
  24
  25__SharpSL_start:
  26
  27/* Check for TC6393 - if found we have a Tosa */
  28        ldr     r7, .TOSAID
  29        mov     r1, #0x10000000         @ Base address of TC6393 chip
  30        mov     r6, #0x03
  31        ldrh    r3, [r1, #8]            @ Load TC6393XB Revison: This is 0x0003
  32        cmp     r6, r3
  33        beq     .SHARPEND               @ Success -> tosa
  34
  35/* Check for pxa270 - if found, branch */
  36        mrc p15, 0, r4, c0, c0          @ Get Processor ID
  37        and     r4, r4, #0xffffff00
  38        ldr     r3, .PXA270ID
  39        cmp     r4, r3
  40        beq     .PXA270
  41
  42/* Check for w100 - if not found we have a Poodle */
  43        ldr     r1, .W100ADDR           @ Base address of w100 chip + regs offset
  44
  45        mov r6, #0x31                   @ Load Magic Init value
  46        str     r6, [r1, #0x280]        @ to SCRATCH_UMSK
  47        mov r5, #0x3000
  48.W100LOOP:
  49        subs r5, r5, #1
  50        bne .W100LOOP
  51        mov r6, #0x30                   @ Load 2nd Magic Init value
  52        str     r6, [r1, #0x280]        @ to SCRATCH_UMSK
  53
  54        ldr     r6, [r1, #0]            @ Load Chip ID
  55        ldr     r3, .W100ID
  56        ldr     r7, .POODLEID
  57        cmp     r6, r3
  58        bne     .SHARPEND                       @ We have no w100 - Poodle
  59
  60/* Check for pxa250 - if found we have a Corgi */
  61        ldr     r7, .CORGIID
  62        ldr     r3, .PXA255ID
  63        cmp     r4, r3
  64        blo     .SHARPEND                       @ We have a PXA250 - Corgi
  65
  66/* Check for 64MiB flash - if found we have a Shepherd */
  67        bl      get_flash_ids
  68        ldr     r7, .SHEPHERDID
  69        cmp     r3, #0x76                       @ 64MiB flash
  70        beq     .SHARPEND                       @ We have Shepherd
  71
  72/* Must be a Husky */
  73        ldr     r7, .HUSKYID            @ Must be Husky
  74        b .SHARPEND
  75
  76.PXA270:
  77/* Check for 16MiB flash - if found we have Spitz */
  78        bl      get_flash_ids
  79        ldr     r7, .SPITZID
  80        cmp     r3, #0x73                       @ 16MiB flash
  81        beq     .SHARPEND                       @ We have Spitz
  82
  83/* Check for a second SCOOP chip - if found we have Borzoi */
  84        ldr     r1, .SCOOP2ADDR
  85        ldr     r7, .BORZOIID
  86        mov     r6, #0x0140
  87        strh    r6, [r1]
  88        ldrh    r6, [r1]
  89        cmp     r6, #0x0140
  90        beq     .SHARPEND                       @ We have Borzoi
  91
  92/* Must be Akita */
  93        ldr     r7, .AKITAID
  94        b       .SHARPEND                       @ We have Borzoi
  95
  96.PXA255ID:
  97        .word   0x69052d00              @ PXA255 Processor ID
  98.PXA270ID:
  99        .word   0x69054100              @ PXA270 Processor ID
 100.W100ID:
 101        .word   0x57411002              @ w100 Chip ID
 102.W100ADDR:
 103        .word   0x08010000              @ w100 Chip ID Reg Address
 104.SCOOP2ADDR:
 105        .word   0x08800040
 106.POODLEID:
 107        .word   MACH_TYPE_POODLE
 108.CORGIID:
 109        .word   MACH_TYPE_CORGI
 110.SHEPHERDID:
 111        .word   MACH_TYPE_SHEPHERD
 112.HUSKYID:
 113        .word   MACH_TYPE_HUSKY
 114.TOSAID:
 115        .word   MACH_TYPE_TOSA
 116.SPITZID:
 117        .word   MACH_TYPE_SPITZ
 118.AKITAID:
 119        .word   MACH_TYPE_AKITA
 120.BORZOIID:
 121        .word   MACH_TYPE_BORZOI
 122
 123/*
 124 * Return: r2 - NAND Manufacturer ID
 125 *         r3 - NAND Chip ID
 126 * Corrupts: r1
 127 */
 128get_flash_ids:
 129        mov     r1, #0x0c000000         @ Base address of NAND chip
 130        ldrb    r3, [r1, #24]           @ Load FLASHCTL
 131        bic     r3, r3, #0x11           @ SET NCE
 132        orr     r3, r3, #0x0a           @ SET CLR + FLWP
 133        strb    r3, [r1, #24]           @ Save to FLASHCTL
 134        mov     r2, #0x90               @ Command "readid"
 135        strb    r2, [r1, #20]           @ Save to FLASHIO
 136        bic     r3, r3, #2              @ CLR CLE
 137        orr     r3, r3, #4              @ SET ALE
 138        strb    r3, [r1, #24]           @ Save to FLASHCTL
 139        mov     r2, #0                  @ Address 0x00
 140        strb    r2, [r1, #20]           @ Save to FLASHIO
 141        bic     r3, r3, #4              @ CLR ALE
 142        strb    r3, [r1, #24]           @ Save to FLASHCTL
 143.fids1:
 144        ldrb    r3, [r1, #24]           @ Load FLASHCTL
 145        tst     r3, #32                 @ Is chip ready?
 146        beq     .fids1
 147        ldrb    r2, [r1, #20]           @ NAND Manufacturer ID
 148        ldrb    r3, [r1, #20]           @ NAND Chip ID
 149        mov     pc, lr
 150
 151.SHARPEND:
 152