1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
/*
* linux/arch/arm/boot/compressed/setup-sa1100.S
*
* Copyright (C) 2000 Nicolas Pitre <nico@cam.org>
*
* SA1100 setup routines, to be used after BSS has been cleared.
*
* John G Dorsey <john+@cs.cmu.edu> 2000/05/25 :
* Runtime test for Neponset added.
*/
#include <linux/linkage.h>
#include <linux/config.h>
#include <asm/mach-types.h>
.text
GPIO_BASE: .long 0x90040000
#define GPLR 0x00
#define GPDR 0x04
#define GPSR 0x08
#define GAFR 0x1c
PPC_BASE: .long 0x90060000
#define PPAR 0x08
UART1_BASE: .long 0x80010000
UART3_BASE: .long 0x80050000
#define UTCR0 0x00
#define UTCR1 0x04
#define UTCR2 0x08
#define UTCR3 0x0c
#define UTSR0 0x1c
#define UTSR1 0x20
#define BAUD_DIV_230400 0x000
#define BAUD_DIV_115200 0x001
#define BAUD_DIV_57600 0x003
#define BAUD_DIV_38400 0x005
#define BAUD_DIV_19200 0x00b
#define BAUD_DIV_9600 0x017
#define BAUD_DIV BAUD_DIV_9600
SCR_loc: .long SYMBOL_NAME(SCR_value)
#define GPIO_2_9 0x3fc
/*
* void sa1100_setup( int arch_id );
*
* This is called from decompress_kernel() with the arch_decomp_setup() macro.
*/
ENTRY(sa1100_setup)
mov r3, r0 @ keep machine type in r3
@ Read System Configuration "Register" for Assabet.
@ (taken from "Intel StrongARM SA-1110 Microprocessor Development Board
@ User's Guide," p.4-9)
teq r3, #MACH_TYPE_ASSABET
bne skip_SCR
ldr r0, GPIO_BASE
ldr r1, [r0, #GPDR]
and r1, r1, #GPIO_2_9
str r1, [r0, #GPDR]
mov r1, #GPIO_2_9
str r1, [r0, #GPSR]
ldr r1, [r0, #GPDR]
bic r1, r1, #GPIO_2_9
str r1, [r0, #GPDR]
mov r2, #100
1: ldr r1, [r0, #GPLR]
subs r2, r2, #1
bne 1b
and r2, r1, #GPIO_2_9
ldr r1, SCR_loc
str r2, [r1]
ldr r1, [r0, #GPDR]
and r1, r1, #GPIO_2_9
str r1, [r0, #GPDR]
skip_SCR:
@ Initialize UART (if bootloader has not done it yet)...
teq r3, #MACH_TYPE_BRUTUS
teqne r3, #MACH_TYPE_ASSABET
bne skip_uart
@ UART3 if Assabet is used with Neponset
teq r3, #25 @ if Assabet
tsteq r2, #(1 << 9) @ ... and Neponset present
ldreq r0, UART3_BASE
beq uart_init
@ At least for Brutus, the UART1 is used through
@ the alternate GPIO function...
teq r3, #MACH_TYPE_BRUTUS
bne uart1
alt_GPIO_uart: ldr r0, GPIO_BASE
ldr r1, [r0, #GPDR]
bic r1, r1, #1<<15
orr r1, r1, #1<<14
str r1, [r0, #GPDR]
ldr r1, [r0, #GAFR]
orr r1, r1, #(1<<15)|(1<<14)
str r1, [r0, #GAFR]
ldr r0, PPC_BASE
ldr r1, [r0, #PPAR]
orr r1, r1, #1<<12
str r1, [r0, #PPAR]
uart1: ldr r0, UART1_BASE
uart_init: ldr r1, [r0, #UTSR1]
tst r1, #1<<0 @ TBY
bne 1b
mov r1, #0
str r1, [r0, #UTCR3]
mov r1, #0x08 @ 8N1
str r1, [r0, #UTCR0]
mov r1, #BAUD_DIV
str r1, [r0, #UTCR2]
mov r1, r1, lsr #8
str r1, [r0, #UTCR1]
mov r1, #0x03 @ RXE + TXE
str r1, [r0, #UTCR3]
mov r1, #0xff @ flush status reg
str r1, [r0, #UTSR0]
skip_uart:
@ Extra specific setup calls
@ The machine type is passed in r0
mov r0, r3
#ifdef CONFIG_SA1100_NANOENGINE
teq r0, #32 @ MACH_TYPE_NANOENGINE
beq SYMBOL_NAME(bse_setup)
#endif
out: mov pc, lr
|
