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
|
.set noreorder
.set noat
.include "hwregs_a.h"
.section .text
.global SpuInit
.type SpuInit, @function
SpuInit:
addiu $sp, -4
sw $ra, 0($sp)
lui $v1, IOBASE
# Stop and mute everything
sh $0 , SPUCNT($v1) # Clear control settings
jal SpuCtrlSync
move $a0, $0
sh $0 , SPU_MASTER_VOL($v1) # Clear master volume
sh $0 , SPU_MASTER_VOL+2($v1)
sh $0 , SPU_REVERB_VOL($v1) # Clear reverb volume
sh $0 , SPU_REVERB_VOL+2($v1)
sh $0 , SPU_CD_VOL($v1) # Clear CD volume
sh $0 , SPU_CD_VOL+2($v1)
sh $0 , SPU_EXT_VOL($v1) # Clear external audio volume
sh $0 , SPU_EXT_VOL+2($v1)
sh $0 , SPU_FM_MODE($v1) # Turn off FM modes
sh $0 , SPU_FM_MODE+2($v1)
sh $0 , SPU_NOISE_MODE($v1) # Turn off noise modes
sh $0 , SPU_NOISE_MODE+2($v1)
sh $0 , SPU_REVERB_ON($v1) # Turn off reverb modes
sh $0 , SPU_REVERB_ON+2($v1)
li $v0, 0xfffe
sh $v0, SPU_REVERB_ADDR($v1)
lui $v0, 0x0200;
ori $v0, 0x3fff;
# Clear all voices
addiu $a1, $sp, -20
sw $0 , 0($a1)
sw $0 , 4($a1)
sw $0 , 8($a1)
sw $0 , 12($a1)
li $a2, 23
.Lclear_voices:
jal SpuSetVoiceRaw
move $a0, $a2
addiu $a2, -1
bgez $a2, .Lclear_voices
nop
li $v0, 0xffff # Set all keys to off
sh $v0, SPU_KEY_OFF($v1)
sh $v0, SPU_KEY_OFF+2($v1)
li $v0, 0x4 # Set SPU data transfer control
sh $v0, SPUDTCNT($v1) # (usually always 0x4)
lw $v0, DPCR($v1) # Enable DMA channel 4 (SPU DMA)
lui $at, 0xb
or $v0, $at
sw $v0, DPCR($v1)
li $v0, 0xC001 # Enable SPU
sh $v0, SPUCNT($v1)
jal SpuCtrlSync
move $a0, $v0
li $v0, 0x3fff # Activate master volume
sh $v0, SPU_MASTER_VOL($v1)
sh $v0, SPU_MASTER_VOL+2($v1)
sh $v0, SPU_CD_VOL($v1) # Activate CD volume
sh $v0, SPU_CD_VOL+2($v1)
sh $v0, SPU_CD_VOL($v1) # Activate CD volume
sh $v0, SPU_CD_VOL+2($v1)
lw $ra, 0($sp)
addiu $sp, 4
jr $ra
nop
# Waits until bits 0-5 of SPUSTAT are equal to SPUCNT
#
# Destroys v0, v1, a0
#
.global SpuCtrlSync
.type SpuCtrlSync, @function
SpuCtrlSync:
lui $v1, IOBASE
andi $a0, 0x3f
.Lctrl_wait:
lhu $v0, SPUSTAT($v1) # Get SPUSTAT value
nop
andi $v0, 0x3f
bne $v0, $a0, .Lctrl_wait # Wait until SPUCNT and SPUSTAT are equal
nop
jr $ra
nop
# Waits until SPU has finished transfers
#
.global SpuWait
.type SpuWait, @function
SpuWait:
lui $v0, IOBASE
lhu $v0, SPUSTAT($v0)
nop
andi $v0, 0x400
bnez $v0, SpuWait
nop
jr $ra
nop
|
