root/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  */
 128 get_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: