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: 152