/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: