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1da177e4 LT |
1 | /* |
2 | * Copyright (c) by Jaroslav Kysela <perex@suse.cz> | |
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 | ||
31 | #include <sound/driver.h> | |
32 | #include <linux/time.h> | |
33 | #include <sound/core.h> | |
34 | #include <sound/emu10k1.h> | |
35 | ||
36 | /* Previously the voice allocator started at 0 every time. The new voice | |
37 | * allocator uses a round robin scheme. The next free voice is tracked in | |
38 | * the card record and each allocation begins where the last left off. The | |
39 | * hardware requires stereo interleaved voices be aligned to an even/odd | |
40 | * boundary. For multichannel voice allocation we ensure than the block of | |
41 | * voices does not cross the 32 voice boundary. This simplifies the | |
42 | * multichannel support and ensures we can use a single write to the | |
43 | * (set|clear)_loop_stop registers. Otherwise (for example) the voices would | |
44 | * get out of sync when pausing/resuming a stream. | |
45 | * --rlrevell | |
46 | */ | |
47 | ||
48 | static int voice_alloc(emu10k1_t *emu, emu10k1_voice_type_t type, int number, emu10k1_voice_t **rvoice) | |
49 | { | |
50 | emu10k1_voice_t *voice; | |
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 | ||
85 | for (i=0; i < number; i++) { | |
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 | ||
108 | int snd_emu10k1_voice_alloc(emu10k1_t *emu, emu10k1_voice_type_t type, int number, emu10k1_voice_t **rvoice) | |
109 | { | |
110 | unsigned long flags; | |
111 | int result; | |
112 | ||
113 | snd_assert(rvoice != NULL, return -EINVAL); | |
114 | snd_assert(number, return -EINVAL); | |
115 | ||
116 | spin_lock_irqsave(&emu->voice_lock, flags); | |
117 | for (;;) { | |
118 | result = voice_alloc(emu, type, number, rvoice); | |
119 | if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI) | |
120 | break; | |
121 | ||
122 | /* free a voice from synth */ | |
123 | if (emu->get_synth_voice) { | |
124 | result = emu->get_synth_voice(emu); | |
125 | if (result >= 0) { | |
126 | emu10k1_voice_t *pvoice = &emu->voices[result]; | |
127 | pvoice->interrupt = NULL; | |
128 | pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0; | |
129 | pvoice->epcm = NULL; | |
130 | } | |
131 | } | |
132 | if (result < 0) | |
133 | break; | |
134 | } | |
135 | spin_unlock_irqrestore(&emu->voice_lock, flags); | |
136 | ||
137 | return result; | |
138 | } | |
139 | ||
140 | int snd_emu10k1_voice_free(emu10k1_t *emu, emu10k1_voice_t *pvoice) | |
141 | { | |
142 | unsigned long flags; | |
143 | ||
144 | snd_assert(pvoice != NULL, return -EINVAL); | |
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 | } |