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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
c1017a4c | 3 | * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
1da177e4 LT |
4 | * Creative Labs, Inc. |
5 | * Lee Revell <rlrevell@joe-job.com> | |
6 | * Routines for control of EMU10K1 chips - voice manager | |
7 | * | |
8 | * Rewrote voice allocator for multichannel support - rlrevell 12/2004 | |
9 | * | |
10 | * BUGS: | |
11 | * -- | |
12 | * | |
13 | * TODO: | |
14 | * -- | |
1da177e4 LT |
15 | */ |
16 | ||
1da177e4 | 17 | #include <linux/time.h> |
d81a6d71 | 18 | #include <linux/export.h> |
1da177e4 LT |
19 | #include <sound/core.h> |
20 | #include <sound/emu10k1.h> | |
21 | ||
22 | /* Previously the voice allocator started at 0 every time. The new voice | |
23 | * allocator uses a round robin scheme. The next free voice is tracked in | |
24 | * the card record and each allocation begins where the last left off. The | |
25 | * hardware requires stereo interleaved voices be aligned to an even/odd | |
26 | * boundary. For multichannel voice allocation we ensure than the block of | |
27 | * voices does not cross the 32 voice boundary. This simplifies the | |
28 | * multichannel support and ensures we can use a single write to the | |
29 | * (set|clear)_loop_stop registers. Otherwise (for example) the voices would | |
30 | * get out of sync when pausing/resuming a stream. | |
31 | * --rlrevell | |
32 | */ | |
33 | ||
eb4698f3 TI |
34 | static int voice_alloc(struct snd_emu10k1 *emu, int type, int number, |
35 | struct snd_emu10k1_voice **rvoice) | |
1da177e4 | 36 | { |
eb4698f3 | 37 | struct snd_emu10k1_voice *voice; |
1da177e4 LT |
38 | int i, j, k, first_voice, last_voice, skip; |
39 | ||
40 | *rvoice = NULL; | |
41 | first_voice = last_voice = 0; | |
42 | for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) { | |
28a97c19 | 43 | /* |
6f002b02 | 44 | dev_dbg(emu->card->dev, "i %d j %d next free %d!\n", |
28a97c19 TI |
45 | i, j, emu->next_free_voice); |
46 | */ | |
1da177e4 LT |
47 | i %= NUM_G; |
48 | ||
49 | /* stereo voices must be even/odd */ | |
50 | if ((number == 2) && (i % 2)) { | |
51 | i++; | |
52 | continue; | |
53 | } | |
54 | ||
55 | skip = 0; | |
56 | for (k = 0; k < number; k++) { | |
57 | voice = &emu->voices[(i+k) % NUM_G]; | |
58 | if (voice->use) { | |
59 | skip = 1; | |
60 | break; | |
61 | } | |
62 | } | |
63 | if (!skip) { | |
6f002b02 | 64 | /* dev_dbg(emu->card->dev, "allocated voice %d\n", i); */ |
1da177e4 LT |
65 | first_voice = i; |
66 | last_voice = (i + number) % NUM_G; | |
67 | emu->next_free_voice = last_voice; | |
68 | break; | |
69 | } | |
70 | } | |
71 | ||
72 | if (first_voice == last_voice) | |
73 | return -ENOMEM; | |
74 | ||
9f4bd5dd | 75 | for (i = 0; i < number; i++) { |
1da177e4 | 76 | voice = &emu->voices[(first_voice + i) % NUM_G]; |
28a97c19 | 77 | /* |
6f002b02 | 78 | dev_dbg(emu->card->dev, "voice alloc - %i, %i of %i\n", |
28a97c19 TI |
79 | voice->number, idx-first_voice+1, number); |
80 | */ | |
1da177e4 LT |
81 | voice->use = 1; |
82 | switch (type) { | |
83 | case EMU10K1_PCM: | |
84 | voice->pcm = 1; | |
85 | break; | |
86 | case EMU10K1_SYNTH: | |
87 | voice->synth = 1; | |
88 | break; | |
89 | case EMU10K1_MIDI: | |
90 | voice->midi = 1; | |
91 | break; | |
92 | case EMU10K1_EFX: | |
93 | voice->efx = 1; | |
94 | break; | |
95 | } | |
96 | } | |
97 | *rvoice = &emu->voices[first_voice]; | |
98 | return 0; | |
99 | } | |
100 | ||
eb4698f3 TI |
101 | int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number, |
102 | struct snd_emu10k1_voice **rvoice) | |
1da177e4 LT |
103 | { |
104 | unsigned long flags; | |
105 | int result; | |
106 | ||
da3cec35 TI |
107 | if (snd_BUG_ON(!rvoice)) |
108 | return -EINVAL; | |
109 | if (snd_BUG_ON(!number)) | |
110 | return -EINVAL; | |
1da177e4 LT |
111 | |
112 | spin_lock_irqsave(&emu->voice_lock, flags); | |
113 | for (;;) { | |
114 | result = voice_alloc(emu, type, number, rvoice); | |
115 | if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI) | |
116 | break; | |
117 | ||
118 | /* free a voice from synth */ | |
119 | if (emu->get_synth_voice) { | |
120 | result = emu->get_synth_voice(emu); | |
121 | if (result >= 0) { | |
eb4698f3 | 122 | struct snd_emu10k1_voice *pvoice = &emu->voices[result]; |
1da177e4 LT |
123 | pvoice->interrupt = NULL; |
124 | pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0; | |
125 | pvoice->epcm = NULL; | |
126 | } | |
127 | } | |
128 | if (result < 0) | |
129 | break; | |
130 | } | |
131 | spin_unlock_irqrestore(&emu->voice_lock, flags); | |
132 | ||
133 | return result; | |
134 | } | |
135 | ||
2dd31dee TI |
136 | EXPORT_SYMBOL(snd_emu10k1_voice_alloc); |
137 | ||
eb4698f3 TI |
138 | int snd_emu10k1_voice_free(struct snd_emu10k1 *emu, |
139 | struct snd_emu10k1_voice *pvoice) | |
1da177e4 LT |
140 | { |
141 | unsigned long flags; | |
142 | ||
da3cec35 TI |
143 | if (snd_BUG_ON(!pvoice)) |
144 | return -EINVAL; | |
1da177e4 LT |
145 | spin_lock_irqsave(&emu->voice_lock, flags); |
146 | pvoice->interrupt = NULL; | |
147 | pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0; | |
148 | pvoice->epcm = NULL; | |
149 | snd_emu10k1_voice_init(emu, pvoice->number); | |
150 | spin_unlock_irqrestore(&emu->voice_lock, flags); | |
151 | return 0; | |
152 | } | |
2dd31dee TI |
153 | |
154 | EXPORT_SYMBOL(snd_emu10k1_voice_free); |