xref: /linux/arch/arm/boot/compressed/head-sharpsl.S (revision 48dea9a700c8728cc31a1dd44588b97578de86ee) 
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:
152