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: