summaryrefslogtreecommitdiff
path: root/arch/blackfin/mach-bf537/boards/led.S
blob: 4e9ea4283e5f7313fefcf2d02580bd243b4c76aa (plain)
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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
/****************************************************
 * LED1 ---- PF6        LED2 ---- PF7               *
 * LED3 ---- PF8        LED4 ---- PF9               *
 * LED5 ---- PF10       LED6 ---- PF11              *
 ****************************************************/

#include <linux/linkage.h>
#include <asm/blackfin.h>

/* All functions in this file save the registers they uses.
   So there is no need to save any registers before calling them.  */

	.text;

/* Initialize LEDs.  */

ENTRY(_led_init)
	LINK 12;
	[--SP] = P0;
	[--SP] = R0;
	[--SP] = R1;
	[--SP] = R2;
	R1 = PF6|PF7|PF8|PF9|PF10|PF11 (Z);
	R2 = ~R1;

	P0.H = hi(PORTF_FER);
	P0.L = lo(PORTF_FER);
	R0 = W[P0](Z);
	SSYNC;
	R0 = R0 & R2;
	W[P0] = R0.L;
	SSYNC;

	P0.H = hi(PORTFIO_DIR);
	P0.L = lo(PORTFIO_DIR);
	R0 = W[P0](Z);
	SSYNC;
	R0 = R0 | R1;
	W[P0] = R0.L;
	SSYNC;

	P0.H = hi(PORTFIO_INEN);
	P0.L = lo(PORTFIO_INEN);
	R0 = W[P0](Z);
	SSYNC;
	R0 = R0 & R2;
	W[P0] = R0.L;
	SSYNC;

	R2 = [SP++];
	R1 = [SP++];
	R0 = [SP++];
	P0 = [SP++];
	UNLINK;
	RTS;
	.size	_led_init, .-_led_init

/* Set one LED on. Leave other LEDs unchanged.
   It expects the LED number passed through R0.  */

ENTRY(_led_on)
	LINK 12;
	[--SP] = P0;
	[--SP] = R1;
	CALL _led_init;
	R1 = 1;
	R0 += 5;
	R1 <<= R0;
	P0.H = hi(PORTFIO);
	P0.L = lo(PORTFIO);
	R0 = W[P0](Z);
	SSYNC;
	R0 = R0 | R1;
	W[P0] = R0.L;
	SSYNC;
	R1 = [SP++];
	P0 = [SP++];
	UNLINK;
	RTS;
	.size	_led_on, .-_led_on

/* Set one LED off. Leave other LEDs unchanged.  */

ENTRY(_led_off)
	LINK 12;
	[--SP] = P0;
	[--SP] = R1;
	CALL _led_init;
	R1 = 1;
	R0 += 5;
	R1 <<= R0;
	R1 = ~R1;
	P0.H = hi(PORTFIO);
	P0.L = lo(PORTFIO);
	R0 = W[P0](Z);
	SSYNC;
	R0 = R0 & R1;
	W[P0] = R0.L;
	SSYNC;
	R1 = [SP++];
	P0 = [SP++];
	UNLINK;
	RTS;
	.size	_led_off, .-_led_off

/* Toggle one LED. Leave other LEDs unchanged.  */

ENTRY(_led_toggle)
	LINK 12;
	[--SP] = P0;
	[--SP] = R1;
	CALL _led_init;
	R1 = 1;
	R0 += 5;
	R1 <<= R0;
	P0.H = hi(PORTFIO);
	P0.L = lo(PORTFIO);
	R0 = W[P0](Z);
	SSYNC;
	R0 = R0 ^ R1;
	W[P0] = R0.L;
	SSYNC;
	R1 = [SP++];
	P0 = [SP++];
	UNLINK;
	RTS;
	.size	_led_toggle, .-_led_toggle

/* Display the number using LEDs in binary format.  */

ENTRY(_led_disp_num)
	LINK 12;
	[--SP] = P0;
	[--SP] = R1;
	[--SP] = R2;
	CALL _led_init;
	R1 = 0x3f(X);
	R0 = R0 & R1;
	R2 = 6(X);
	R0 <<= R2;
	R1 <<= R2;
	P0.H = hi(PORTFIO);
	P0.L = lo(PORTFIO);
	R2 = W[P0](Z);
	SSYNC;
	R1 = ~R1;
	R2 = R2 & R1;
	R2 = R2 | R0;
	W[P0] = R2.L;
	SSYNC;
	R2 = [SP++];
	R1 = [SP++];
	P0 = [SP++];
	UNLINK;
	RTS;
	.size	_led_disp_num, .-_led_disp_num

/* Toggle the number using LEDs in binary format.  */

ENTRY(_led_toggle_num)
	LINK 12;
	[--SP] = P0;
	[--SP] = R1;
	[--SP] = R2;
	CALL _led_init;
	R1 = 0x3f(X);
	R0 = R0 & R1;
	R1 = 6(X);
	R0 <<= R1;
	P0.H = hi(PORTFIO);
	P0.L = lo(PORTFIO);
	R1 = W[P0](Z);
	SSYNC;
	R1 = R1 ^ R0;
	W[P0] = R1.L;
	SSYNC;
	R2 = [SP++];
	R1 = [SP++];
	P0 = [SP++];
	UNLINK;
	RTS;
	.size	_led_toggle_num, .-_led_toggle_num