Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 48 | static int voice_alloc(struct snd_emu10k1 *emu, int type, int number, |
| 49 | struct snd_emu10k1_voice **rvoice) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | { |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 51 | struct snd_emu10k1_voice *voice; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | int i, j, k, first_voice, last_voice, skip; |
| 53 | |
| 54 | *rvoice = NULL; |
| 55 | first_voice = last_voice = 0; |
| 56 | for (i = emu->next_free_voice, j = 0; j < NUM_G ; i += number, j += number) { |
| 57 | // printk("i %d j %d next free %d!\n", i, j, emu->next_free_voice); |
| 58 | i %= NUM_G; |
| 59 | |
| 60 | /* stereo voices must be even/odd */ |
| 61 | if ((number == 2) && (i % 2)) { |
| 62 | i++; |
| 63 | continue; |
| 64 | } |
| 65 | |
| 66 | skip = 0; |
| 67 | for (k = 0; k < number; k++) { |
| 68 | voice = &emu->voices[(i+k) % NUM_G]; |
| 69 | if (voice->use) { |
| 70 | skip = 1; |
| 71 | break; |
| 72 | } |
| 73 | } |
| 74 | if (!skip) { |
| 75 | // printk("allocated voice %d\n", i); |
| 76 | first_voice = i; |
| 77 | last_voice = (i + number) % NUM_G; |
| 78 | emu->next_free_voice = last_voice; |
| 79 | break; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | if (first_voice == last_voice) |
| 84 | return -ENOMEM; |
| 85 | |
| 86 | for (i=0; i < number; i++) { |
| 87 | voice = &emu->voices[(first_voice + i) % NUM_G]; |
| 88 | // printk("voice alloc - %i, %i of %i\n", voice->number, idx-first_voice+1, number); |
| 89 | voice->use = 1; |
| 90 | switch (type) { |
| 91 | case EMU10K1_PCM: |
| 92 | voice->pcm = 1; |
| 93 | break; |
| 94 | case EMU10K1_SYNTH: |
| 95 | voice->synth = 1; |
| 96 | break; |
| 97 | case EMU10K1_MIDI: |
| 98 | voice->midi = 1; |
| 99 | break; |
| 100 | case EMU10K1_EFX: |
| 101 | voice->efx = 1; |
| 102 | break; |
| 103 | } |
| 104 | } |
| 105 | *rvoice = &emu->voices[first_voice]; |
| 106 | return 0; |
| 107 | } |
| 108 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 109 | int snd_emu10k1_voice_alloc(struct snd_emu10k1 *emu, int type, int number, |
| 110 | struct snd_emu10k1_voice **rvoice) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | { |
| 112 | unsigned long flags; |
| 113 | int result; |
| 114 | |
| 115 | snd_assert(rvoice != NULL, return -EINVAL); |
| 116 | snd_assert(number, return -EINVAL); |
| 117 | |
| 118 | spin_lock_irqsave(&emu->voice_lock, flags); |
| 119 | for (;;) { |
| 120 | result = voice_alloc(emu, type, number, rvoice); |
| 121 | if (result == 0 || type == EMU10K1_SYNTH || type == EMU10K1_MIDI) |
| 122 | break; |
| 123 | |
| 124 | /* free a voice from synth */ |
| 125 | if (emu->get_synth_voice) { |
| 126 | result = emu->get_synth_voice(emu); |
| 127 | if (result >= 0) { |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 128 | struct snd_emu10k1_voice *pvoice = &emu->voices[result]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | pvoice->interrupt = NULL; |
| 130 | pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0; |
| 131 | pvoice->epcm = NULL; |
| 132 | } |
| 133 | } |
| 134 | if (result < 0) |
| 135 | break; |
| 136 | } |
| 137 | spin_unlock_irqrestore(&emu->voice_lock, flags); |
| 138 | |
| 139 | return result; |
| 140 | } |
| 141 | |
Takashi Iwai | 2dd31de | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 142 | EXPORT_SYMBOL(snd_emu10k1_voice_alloc); |
| 143 | |
Takashi Iwai | eb4698f | 2005-11-17 14:50:13 +0100 | [diff] [blame] | 144 | int snd_emu10k1_voice_free(struct snd_emu10k1 *emu, |
| 145 | struct snd_emu10k1_voice *pvoice) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
| 147 | unsigned long flags; |
| 148 | |
| 149 | snd_assert(pvoice != NULL, return -EINVAL); |
| 150 | spin_lock_irqsave(&emu->voice_lock, flags); |
| 151 | pvoice->interrupt = NULL; |
| 152 | pvoice->use = pvoice->pcm = pvoice->synth = pvoice->midi = pvoice->efx = 0; |
| 153 | pvoice->epcm = NULL; |
| 154 | snd_emu10k1_voice_init(emu, pvoice->number); |
| 155 | spin_unlock_irqrestore(&emu->voice_lock, flags); |
| 156 | return 0; |
| 157 | } |
Takashi Iwai | 2dd31de | 2006-04-28 15:13:39 +0200 | [diff] [blame] | 158 | |
| 159 | EXPORT_SYMBOL(snd_emu10k1_voice_free); |