Commit | Line | Data |
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1da177e4 | 1 | /* |
c1017a4c | 2 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
3 | * Creative Labs, Inc. |
4 | * Lee Revell <rlrevell@joe-job.com> | |
5 | * Routines for control of EMU10K1 chips - voice manager | |
6 | * | |
7 | * Rewrote voice allocator for multichannel support - rlrevell 12/2004 | |
8 | * | |
9 | * BUGS: | |
10 | * -- | |
11 | * | |
12 | * TODO: | |
13 | * -- | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | * GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
28 | * | |
29 | */ | |
30 | ||
1da177e4 LT |
31 | #include <linux/time.h> |
32 | #include <sound/core.h> | |
33 | #include <sound/emu10k1.h> | |
34 | ||
35 | /* Previously the voice allocator started at 0 every time. The new voice | |
36 | * allocator uses a round robin scheme. The next free voice is tracked in | |
37 | * the card record and each allocation begins where the last left off. The | |
38 | * hardware requires stereo interleaved voices be aligned to an even/odd | |
39 | * boundary. For multichannel voice allocation we ensure than the block of | |
40 | * voices does not cross the 32 voice boundary. This simplifies the | |
41 | * multichannel support and ensures we can use a single write to the | |
42 | * (set|clear)_loop_stop registers. Otherwise (for example) the voices would | |
43 | * get out of sync when pausing/resuming a stream. | |
44 | * --rlrevell | |
45 | */ | |
46 | ||
eb4698f3 TI |
47 | static int voice_alloc(struct snd_emu10k1 *emu, int type, int number, |
48 | struct snd_emu10k1_voice **rvoice) | |
1da177e4 | 49 | { |
eb4698f3 | 50 | struct snd_emu10k1_voice *voice; |
1da177e4 LT |
51 | int i, j, k, first_voice, last_voice, skip; |
52 | ||
53 | *rvoice = NULL; | |
54 | first_voice = last_voice = 0; | |
55 | for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) { | |
56 | // printk("i %d j %d next free %d!\n", i, j, emu->next_free_voice); | |
57 | i %= NUM_G; | |
58 | ||
59 | /* stereo voices must be even/odd */ | |
60 | if ((number == 2) && (i % 2)) { | |
61 | i++; | |
62 | continue; | |
63 | } | |
64 | ||
65 | skip = 0; | |
66 | for (k = 0; k < number; k++) { | |
67 | voice = &emu->voices[(i+k) % NUM_G]; | |
68 | if (voice->use) { | |
69 | skip = 1; | |
70 | break; | |
71 | } | |
72 | } | |
73 | if (!skip) { | |
74 | // printk("allocated voice %d\n", i); | |
75 | first_voice = i; | |
76 | last_voice = (i + number) % NUM_G; | |
77 | emu->next_free_voice = last_voice; | |
78 | break; | |
79 | } | |
80 | } | |
81 | ||
82 | if (first_voice == last_voice) | |
83 | return -ENOMEM; | |
84 | ||
9f4bd5dd | 85 | for (i = 0; i < number; i++) { |
1da177e4 LT |
86 | voice = &emu->voices[(first_voice + i) % NUM_G]; |
87 | // printk("voice alloc - %i, %i of %i\n", voice->number, idx-first_voice+1, number); | |
88 | voice->use = 1; | |
89 | switch (type) { | |
90 | case EMU10K1_PCM: | |
91 | voice->pcm = 1; | |
92 | break; | |
93 | case EMU10K1_SYNTH: | |
94 | voice->synth = 1; | |
95 | break; | |
96 | case EMU10K1_MIDI: | |
97 | voice->midi = 1; | |
98 | break; | |
99 | case EMU10K1_EFX: | |
100 | voice->efx = 1; | |
101 | break; | |
102 | } | |
103 | } | |
104 | *rvoice = &emu->voices[first_voice]; | |
105 | return 0; | |
106 | } | |
107 | ||
eb4698f3 TI |
108 | int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number, |
109 | struct snd_emu10k1_voice **rvoice) | |
1da177e4 LT |
110 | { |
111 | unsigned long flags; | |
112 | int result; | |
113 | ||
da3cec35 TI |
114 | if (snd_BUG_ON(!rvoice)) |
115 | return -EINVAL; | |
116 | if (snd_BUG_ON(!number)) | |
117 | return -EINVAL; | |
1da177e4 LT |
118 | |
119 | spin_lock_irqsave(&emu->voice_lock, flags); | |
120 | for (;;) { | |
121 | result = voice_alloc(emu, type, number, rvoice); | |
122 | if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI) | |
123 | break; | |
124 | ||
125 | /* free a voice from synth */ | |
126 | if (emu->get_synth_voice) { | |
127 | result = emu->get_synth_voice(emu); | |
128 | if (result >= 0) { | |
eb4698f3 | 129 | struct snd_emu10k1_voice *pvoice = &emu->voices[result]; |
1da177e4 LT |
130 | pvoice->interrupt = NULL; |
131 | pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0; | |
132 | pvoice->epcm = NULL; | |
133 | } | |
134 | } | |
135 | if (result < 0) | |
136 | break; | |
137 | } | |
138 | spin_unlock_irqrestore(&emu->voice_lock, flags); | |
139 | ||
140 | return result; | |
141 | } | |
142 | ||
2dd31dee TI |
143 | EXPORT_SYMBOL(snd_emu10k1_voice_alloc); |
144 | ||
eb4698f3 TI |
145 | int snd_emu10k1_voice_free(struct snd_emu10k1 *emu, |
146 | struct snd_emu10k1_voice *pvoice) | |
1da177e4 LT |
147 | { |
148 | unsigned long flags; | |
149 | ||
da3cec35 TI |
150 | if (snd_BUG_ON(!pvoice)) |
151 | return -EINVAL; | |
1da177e4 LT |
152 | spin_lock_irqsave(&emu->voice_lock, flags); |
153 | pvoice->interrupt = NULL; | |
154 | pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0; | |
155 | pvoice->epcm = NULL; | |
156 | snd_emu10k1_voice_init(emu, pvoice->number); | |
157 | spin_unlock_irqrestore(&emu->voice_lock, flags); | |
158 | return 0; | |
159 | } | |
2dd31dee TI |
160 | |
161 | EXPORT_SYMBOL(snd_emu10k1_voice_free); |