1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/arch/arm/boot/compressed/head-sharpsl
4 *
5 * Copyright (C) 2004-2005 Richard Purdie <rpur
6 *
7 * Sharp's bootloader doesn't pass any kind of
8 * so we have to figure out the machine for ou
9 *
10 * Support for Poodle, Corgi (SL-C700), Shephe
11 * Husky (SL-C760), Tosa (SL-C6000), Spitz (SL
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
30 mov r6, #0x03
31 ldrh r3, [r1, #8] @ Load
32 cmp r6, r3
33 beq .SHARPEND @ Succ
34
35 /* Check for pxa270 - if found, branch */
36 mrc p15, 0, r4, c0, c0 @ Get
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 Poo
43 ldr r1, .W100ADDR @ Base
44
45 mov r6, #0x31 @ Load
46 str r6, [r1, #0x280] @ to S
47 mov r5, #0x3000
48 .W100LOOP:
49 subs r5, r5, #1
50 bne .W100LOOP
51 mov r6, #0x30 @ Load
52 str r6, [r1, #0x280] @ to S
53
54 ldr r6, [r1, #0] @ Load
55 ldr r3, .W100ID
56 ldr r7, .POODLEID
57 cmp r6, r3
58 bne .SHARPEND
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
65
66 /* Check for 64MiB flash - if found we have a
67 bl get_flash_ids
68 ldr r7, .SHEPHERDID
69 cmp r3, #0x76
70 beq .SHARPEND
71
72 /* Must be a Husky */
73 ldr r7, .HUSKYID @ Must
74 b .SHARPEND
75
76 .PXA270:
77 /* Check for 16MiB flash - if found we have Sp
78 bl get_flash_ids
79 ldr r7, .SPITZID
80 cmp r3, #0x73
81 beq .SHARPEND
82
83 /* Check for a second SCOOP chip - if found we
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
91
92 /* Must be Akita */
93 ldr r7, .AKITAID
94 b .SHARPEND
95
96 .PXA255ID:
97 .word 0x69052d00 @ PXA2
98 .PXA270ID:
99 .word 0x69054100 @ PXA2
100 .W100ID:
101 .word 0x57411002 @ w100
102 .W100ADDR:
103 .word 0x08010000 @ w100
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
130 ldrb r3, [r1, #24] @ Load
131 bic r3, r3, #0x11 @ SET
132 orr r3, r3, #0x0a @ SET
133 strb r3, [r1, #24] @ Save
134 mov r2, #0x90 @ Comm
135 strb r2, [r1, #20] @ Save
136 bic r3, r3, #2 @ CLR
137 orr r3, r3, #4 @ SET
138 strb r3, [r1, #24] @ Save
139 mov r2, #0 @ Addr
140 strb r2, [r1, #20] @ Save
141 bic r3, r3, #4 @ CLR
142 strb r3, [r1, #24] @ Save
143 .fids1:
144 ldrb r3, [r1, #24] @ Load
145 tst r3, #32 @ Is c
146 beq .fids1
147 ldrb r2, [r1, #20] @ NAND
148 ldrb r3, [r1, #20] @ NAND
149 mov pc, lr
150
151 .SHARPEND:
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