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  */
 127 get_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: