diff options
Diffstat (limited to 'sound/isa/sb/emu8000_pcm.c')
| -rw-r--r-- | sound/isa/sb/emu8000_pcm.c | 704 |
1 files changed, 704 insertions, 0 deletions
diff --git a/sound/isa/sb/emu8000_pcm.c b/sound/isa/sb/emu8000_pcm.c new file mode 100644 index 000000000000..db5eb8b55058 --- /dev/null +++ b/sound/isa/sb/emu8000_pcm.c @@ -0,0 +1,704 @@ +/* + * pcm emulation on emu8000 wavetable + * + * Copyright (C) 2002 Takashi Iwai <tiwai@suse.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "emu8000_local.h" +#include <linux/init.h> +#include <sound/initval.h> +#include <sound/pcm.h> + +/* + * define the following if you want to use this pcm with non-interleaved mode + */ +/* #define USE_NONINTERLEAVE */ + +/* NOTE: for using the non-interleaved mode with alsa-lib, you have to set + * mmap_emulation flag to 1 in your .asoundrc, such like + * + * pcm.emu8k { + * type plug + * slave.pcm { + * type hw + * card 0 + * device 1 + * mmap_emulation 1 + * } + * } + * + * besides, for the time being, the non-interleaved mode doesn't work well on + * alsa-lib... + */ + + +typedef struct snd_emu8k_pcm emu8k_pcm_t; + +struct snd_emu8k_pcm { + emu8000_t *emu; + snd_pcm_substream_t *substream; + + unsigned int allocated_bytes; + snd_util_memblk_t *block; + unsigned int offset; + unsigned int buf_size; + unsigned int period_size; + unsigned int loop_start[2]; + unsigned int pitch; + int panning[2]; + int last_ptr; + int period_pos; + int voices; + unsigned int dram_opened: 1; + unsigned int running: 1; + unsigned int timer_running: 1; + struct timer_list timer; + spinlock_t timer_lock; +}; + +#define LOOP_BLANK_SIZE 8 + + +/* + * open up channels for the simultaneous data transfer and playback + */ +static int +emu8k_open_dram_for_pcm(emu8000_t *emu, int channels) +{ + int i; + + /* reserve up to 2 voices for playback */ + snd_emux_lock_voice(emu->emu, 0); + if (channels > 1) + snd_emux_lock_voice(emu->emu, 1); + + /* reserve 28 voices for loading */ + for (i = channels + 1; i < EMU8000_DRAM_VOICES; i++) { + unsigned int mode = EMU8000_RAM_WRITE; + snd_emux_lock_voice(emu->emu, i); +#ifndef USE_NONINTERLEAVE + if (channels > 1 && (i & 1) != 0) + mode |= EMU8000_RAM_RIGHT; +#endif + snd_emu8000_dma_chan(emu, i, mode); + } + + /* assign voice 31 and 32 to ROM */ + EMU8000_VTFT_WRITE(emu, 30, 0); + EMU8000_PSST_WRITE(emu, 30, 0x1d8); + EMU8000_CSL_WRITE(emu, 30, 0x1e0); + EMU8000_CCCA_WRITE(emu, 30, 0x1d8); + EMU8000_VTFT_WRITE(emu, 31, 0); + EMU8000_PSST_WRITE(emu, 31, 0x1d8); + EMU8000_CSL_WRITE(emu, 31, 0x1e0); + EMU8000_CCCA_WRITE(emu, 31, 0x1d8); + + return 0; +} + +/* + */ +static void +snd_emu8000_write_wait(emu8000_t *emu, int can_schedule) +{ + while ((EMU8000_SMALW_READ(emu) & 0x80000000) != 0) { + if (can_schedule) { + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(1); + if (signal_pending(current)) + break; + } + } +} + +/* + * close all channels + */ +static void +emu8k_close_dram(emu8000_t *emu) +{ + int i; + + for (i = 0; i < 2; i++) + snd_emux_unlock_voice(emu->emu, i); + for (; i < EMU8000_DRAM_VOICES; i++) { + snd_emu8000_dma_chan(emu, i, EMU8000_RAM_CLOSE); + snd_emux_unlock_voice(emu->emu, i); + } +} + +/* + * convert Hz to AWE32 rate offset (see emux/soundfont.c) + */ + +#define OFFSET_SAMPLERATE 1011119 /* base = 44100 */ +#define SAMPLERATE_RATIO 4096 + +static int calc_rate_offset(int hz) +{ + return snd_sf_linear_to_log(hz, OFFSET_SAMPLERATE, SAMPLERATE_RATIO); +} + + +/* + */ + +static snd_pcm_hardware_t emu8k_pcm_hw = { +#ifdef USE_NONINTERLEAVE + .info = SNDRV_PCM_INFO_NONINTERLEAVED, +#else + .info = SNDRV_PCM_INFO_INTERLEAVED, +#endif + .formats = SNDRV_PCM_FMTBIT_S16_LE, + .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000, + .rate_min = 4000, + .rate_max = 48000, + .channels_min = 1, + .channels_max = 2, + .buffer_bytes_max = (128*1024), + .period_bytes_min = 1024, + .period_bytes_max = (128*1024), + .periods_min = 2, + .periods_max = 1024, + .fifo_size = 0, + +}; + +/* + * get the current position at the given channel from CCCA register + */ +static inline int emu8k_get_curpos(emu8k_pcm_t *rec, int ch) +{ + int val = EMU8000_CCCA_READ(rec->emu, ch) & 0xfffffff; + val -= rec->loop_start[ch] - 1; + return val; +} + + +/* + * timer interrupt handler + * check the current position and update the period if necessary. + */ +static void emu8k_pcm_timer_func(unsigned long data) +{ + emu8k_pcm_t *rec = (emu8k_pcm_t *)data; + int ptr, delta; + + spin_lock(&rec->timer_lock); + /* update the current pointer */ + ptr = emu8k_get_curpos(rec, 0); + if (ptr < rec->last_ptr) + delta = ptr + rec->buf_size - rec->last_ptr; + else + delta = ptr - rec->last_ptr; + rec->period_pos += delta; + rec->last_ptr = ptr; + + /* reprogram timer */ + rec->timer.expires = jiffies + 1; + add_timer(&rec->timer); + + /* update period */ + if (rec->period_pos >= (int)rec->period_size) { + rec->period_pos %= rec->period_size; + spin_unlock(&rec->timer_lock); + snd_pcm_period_elapsed(rec->substream); + return; + } + spin_unlock(&rec->timer_lock); +} + + +/* + * open pcm + * creating an instance here + */ +static int emu8k_pcm_open(snd_pcm_substream_t *subs) +{ + emu8000_t *emu = snd_pcm_substream_chip(subs); + emu8k_pcm_t *rec; + snd_pcm_runtime_t *runtime = subs->runtime; + + rec = kcalloc(1, sizeof(*rec), GFP_KERNEL); + if (! rec) + return -ENOMEM; + + rec->emu = emu; + rec->substream = subs; + runtime->private_data = rec; + + spin_lock_init(&rec->timer_lock); + init_timer(&rec->timer); + rec->timer.function = emu8k_pcm_timer_func; + rec->timer.data = (unsigned long)rec; + + runtime->hw = emu8k_pcm_hw; + runtime->hw.buffer_bytes_max = emu->mem_size - LOOP_BLANK_SIZE * 3; + runtime->hw.period_bytes_max = runtime->hw.buffer_bytes_max / 2; + + /* use timer to update periods.. (specified in msec) */ + snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_TIME, + (1000000 + HZ - 1) / HZ, UINT_MAX); + + return 0; +} + +static int emu8k_pcm_close(snd_pcm_substream_t *subs) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + kfree(rec); + subs->runtime->private_data = NULL; + return 0; +} + +/* + * calculate pitch target + */ +static int calc_pitch_target(int pitch) +{ + int ptarget = 1 << (pitch >> 12); + if (pitch & 0x800) ptarget += (ptarget * 0x102e) / 0x2710; + if (pitch & 0x400) ptarget += (ptarget * 0x764) / 0x2710; + if (pitch & 0x200) ptarget += (ptarget * 0x389) / 0x2710; + ptarget += (ptarget >> 1); + if (ptarget > 0xffff) ptarget = 0xffff; + return ptarget; +} + +/* + * set up the voice + */ +static void setup_voice(emu8k_pcm_t *rec, int ch) +{ + emu8000_t *hw = rec->emu; + unsigned int temp; + + /* channel to be silent and idle */ + EMU8000_DCYSUSV_WRITE(hw, ch, 0x0080); + EMU8000_VTFT_WRITE(hw, ch, 0x0000FFFF); + EMU8000_CVCF_WRITE(hw, ch, 0x0000FFFF); + EMU8000_PTRX_WRITE(hw, ch, 0); + EMU8000_CPF_WRITE(hw, ch, 0); + + /* pitch offset */ + EMU8000_IP_WRITE(hw, ch, rec->pitch); + /* set envelope parameters */ + EMU8000_ENVVAL_WRITE(hw, ch, 0x8000); + EMU8000_ATKHLD_WRITE(hw, ch, 0x7f7f); + EMU8000_DCYSUS_WRITE(hw, ch, 0x7f7f); + EMU8000_ENVVOL_WRITE(hw, ch, 0x8000); + EMU8000_ATKHLDV_WRITE(hw, ch, 0x7f7f); + /* decay/sustain parameter for volume envelope is used + for triggerg the voice */ + /* modulation envelope heights */ + EMU8000_PEFE_WRITE(hw, ch, 0x0); + /* lfo1/2 delay */ + EMU8000_LFO1VAL_WRITE(hw, ch, 0x8000); + EMU8000_LFO2VAL_WRITE(hw, ch, 0x8000); + /* lfo1 pitch & cutoff shift */ + EMU8000_FMMOD_WRITE(hw, ch, 0); + /* lfo1 volume & freq */ + EMU8000_TREMFRQ_WRITE(hw, ch, 0); + /* lfo2 pitch & freq */ + EMU8000_FM2FRQ2_WRITE(hw, ch, 0); + /* pan & loop start */ + temp = rec->panning[ch]; + temp = (temp <<24) | ((unsigned int)rec->loop_start[ch] - 1); + EMU8000_PSST_WRITE(hw, ch, temp); + /* chorus & loop end (chorus 8bit, MSB) */ + temp = 0; // chorus + temp = (temp << 24) | ((unsigned int)rec->loop_start[ch] + rec->buf_size - 1); + EMU8000_CSL_WRITE(hw, ch, temp); + /* Q & current address (Q 4bit value, MSB) */ + temp = 0; // filterQ + temp = (temp << 28) | ((unsigned int)rec->loop_start[ch] - 1); + EMU8000_CCCA_WRITE(hw, ch, temp); + /* clear unknown registers */ + EMU8000_00A0_WRITE(hw, ch, 0); + EMU8000_0080_WRITE(hw, ch, 0); +} + +/* + * trigger the voice + */ +static void start_voice(emu8k_pcm_t *rec, int ch) +{ + unsigned long flags; + emu8000_t *hw = rec->emu; + unsigned int temp, aux; + int pt = calc_pitch_target(rec->pitch); + + /* cutoff and volume */ + EMU8000_IFATN_WRITE(hw, ch, 0xff00); + EMU8000_VTFT_WRITE(hw, ch, 0xffff); + EMU8000_CVCF_WRITE(hw, ch, 0xffff); + /* trigger envelope */ + EMU8000_DCYSUSV_WRITE(hw, ch, 0x7f7f); + /* set reverb and pitch target */ + temp = 0; // reverb + if (rec->panning[ch] == 0) + aux = 0xff; + else + aux = (-rec->panning[ch]) & 0xff; + temp = (temp << 8) | (pt << 16) | aux; + EMU8000_PTRX_WRITE(hw, ch, temp); + EMU8000_CPF_WRITE(hw, ch, pt << 16); + + /* start timer */ + spin_lock_irqsave(&rec->timer_lock, flags); + if (! rec->timer_running) { + rec->timer.expires = jiffies + 1; + add_timer(&rec->timer); + rec->timer_running = 1; + } + spin_unlock_irqrestore(&rec->timer_lock, flags); +} + +/* + * stop the voice immediately + */ +static void stop_voice(emu8k_pcm_t *rec, int ch) +{ + unsigned long flags; + emu8000_t *hw = rec->emu; + + EMU8000_DCYSUSV_WRITE(hw, ch, 0x807F); + + /* stop timer */ + spin_lock_irqsave(&rec->timer_lock, flags); + if (rec->timer_running) { + del_timer(&rec->timer); + rec->timer_running = 0; + } + spin_unlock_irqrestore(&rec->timer_lock, flags); +} + +static int emu8k_pcm_trigger(snd_pcm_substream_t *subs, int cmd) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + int ch; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + for (ch = 0; ch < rec->voices; ch++) + start_voice(rec, ch); + rec->running = 1; + break; + case SNDRV_PCM_TRIGGER_STOP: + rec->running = 0; + for (ch = 0; ch < rec->voices; ch++) + stop_voice(rec, ch); + break; + default: + return -EINVAL; + } + return 0; +} + + +/* + * copy / silence ops + */ + +/* + * this macro should be inserted in the copy/silence loops + * to reduce the latency. without this, the system will hang up + * during the whole loop. + */ +#define CHECK_SCHEDULER() \ +do { \ + cond_resched();\ + if (signal_pending(current))\ + return -EAGAIN;\ +} while (0) + + +#ifdef USE_NONINTERLEAVE +/* copy one channel block */ +static int emu8k_transfer_block(emu8000_t *emu, int offset, unsigned short *buf, int count) +{ + EMU8000_SMALW_WRITE(emu, offset); + while (count > 0) { + unsigned short sval; + CHECK_SCHEDULER(); + get_user(sval, buf); + EMU8000_SMLD_WRITE(emu, sval); + buf++; + count--; + } + return 0; +} + +static int emu8k_pcm_copy(snd_pcm_substream_t *subs, + int voice, + snd_pcm_uframes_t pos, + void *src, + snd_pcm_uframes_t count) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + emu8000_t *emu = rec->emu; + + snd_emu8000_write_wait(emu, 1); + if (voice == -1) { + unsigned short *buf = src; + int i, err; + count /= rec->voices; + for (i = 0; i < rec->voices; i++) { + err = emu8k_transfer_block(emu, pos + rec->loop_start[i], buf, count); + if (err < 0) + return err; + buf += count; + } + return 0; + } else { + return emu8k_transfer_block(emu, pos + rec->loop_start[voice], src, count); + } +} + +/* make a channel block silence */ +static int emu8k_silence_block(emu8000_t *emu, int offset, int count) +{ + EMU8000_SMALW_WRITE(emu, offset); + while (count > 0) { + CHECK_SCHEDULER(); + EMU8000_SMLD_WRITE(emu, 0); + count--; + } + return 0; +} + +static int emu8k_pcm_silence(snd_pcm_substream_t *subs, + int voice, + snd_pcm_uframes_t pos, + snd_pcm_uframes_t count) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + emu8000_t *emu = rec->emu; + + snd_emu8000_write_wait(emu, 1); + if (voice == -1 && rec->voices == 1) + voice = 0; + if (voice == -1) { + int err; + err = emu8k_silence_block(emu, pos + rec->loop_start[0], count / 2); + if (err < 0) + return err; + return emu8k_silence_block(emu, pos + rec->loop_start[1], count / 2); + } else { + return emu8k_silence_block(emu, pos + rec->loop_start[voice], count); + } +} + +#else /* interleave */ + +/* + * copy the interleaved data can be done easily by using + * DMA "left" and "right" channels on emu8k engine. + */ +static int emu8k_pcm_copy(snd_pcm_substream_t *subs, + int voice, + snd_pcm_uframes_t pos, + void __user *src, + snd_pcm_uframes_t count) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + emu8000_t *emu = rec->emu; + unsigned short __user *buf = src; + + snd_emu8000_write_wait(emu, 1); + EMU8000_SMALW_WRITE(emu, pos + rec->loop_start[0]); + if (rec->voices > 1) + EMU8000_SMARW_WRITE(emu, pos + rec->loop_start[1]); + + while (count-- > 0) { + unsigned short sval; + CHECK_SCHEDULER(); + get_user(sval, buf); + EMU8000_SMLD_WRITE(emu, sval); + buf++; + if (rec->voices > 1) { + CHECK_SCHEDULER(); + get_user(sval, buf); + EMU8000_SMRD_WRITE(emu, sval); + buf++; + } + } + return 0; +} + +static int emu8k_pcm_silence(snd_pcm_substream_t *subs, + int voice, + snd_pcm_uframes_t pos, + snd_pcm_uframes_t count) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + emu8000_t *emu = rec->emu; + + snd_emu8000_write_wait(emu, 1); + EMU8000_SMALW_WRITE(emu, rec->loop_start[0] + pos); + if (rec->voices > 1) + EMU8000_SMARW_WRITE(emu, rec->loop_start[1] + pos); + while (count-- > 0) { + CHECK_SCHEDULER(); + EMU8000_SMLD_WRITE(emu, 0); + if (rec->voices > 1) { + CHECK_SCHEDULER(); + EMU8000_SMRD_WRITE(emu, 0); + } + } + return 0; +} +#endif + + +/* + * allocate a memory block + */ +static int emu8k_pcm_hw_params(snd_pcm_substream_t *subs, + snd_pcm_hw_params_t *hw_params) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + + if (rec->block) { + /* reallocation - release the old block */ + snd_util_mem_free(rec->emu->memhdr, rec->block); + rec->block = NULL; + } + + rec->allocated_bytes = params_buffer_bytes(hw_params) + LOOP_BLANK_SIZE * 4; + rec->block = snd_util_mem_alloc(rec->emu->memhdr, rec->allocated_bytes); + if (! rec->block) + return -ENOMEM; + rec->offset = EMU8000_DRAM_OFFSET + (rec->block->offset >> 1); /* in word */ + /* at least dma_bytes must be set for non-interleaved mode */ + subs->dma_buffer.bytes = params_buffer_bytes(hw_params); + + return 0; +} + +/* + * free the memory block + */ +static int emu8k_pcm_hw_free(snd_pcm_substream_t *subs) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + + if (rec->block) { + int ch; + for (ch = 0; ch < rec->voices; ch++) + stop_voice(rec, ch); // to be sure + if (rec->dram_opened) + emu8k_close_dram(rec->emu); + snd_util_mem_free(rec->emu->memhdr, rec->block); + rec->block = NULL; + } + return 0; +} + +/* + */ +static int emu8k_pcm_prepare(snd_pcm_substream_t *subs) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + + rec->pitch = 0xe000 + calc_rate_offset(subs->runtime->rate); + rec->last_ptr = 0; + rec->period_pos = 0; + + rec->buf_size = subs->runtime->buffer_size; + rec->period_size = subs->runtime->period_size; + rec->voices = subs->runtime->channels; + rec->loop_start[0] = rec->offset + LOOP_BLANK_SIZE; + if (rec->voices > 1) + rec->loop_start[1] = rec->loop_start[0] + rec->buf_size + LOOP_BLANK_SIZE; + if (rec->voices > 1) { + rec->panning[0] = 0xff; + rec->panning[1] = 0x00; + } else + rec->panning[0] = 0x80; + + if (! rec->dram_opened) { + int err, i, ch; + + snd_emux_terminate_all(rec->emu->emu); + if ((err = emu8k_open_dram_for_pcm(rec->emu, rec->voices)) != 0) + return err; + rec->dram_opened = 1; + + /* clear loop blanks */ + snd_emu8000_write_wait(rec->emu, 0); + EMU8000_SMALW_WRITE(rec->emu, rec->offset); + for (i = 0; i < LOOP_BLANK_SIZE; i++) + EMU8000_SMLD_WRITE(rec->emu, 0); + for (ch = 0; ch < rec->voices; ch++) { + EMU8000_SMALW_WRITE(rec->emu, rec->loop_start[ch] + rec->buf_size); + for (i = 0; i < LOOP_BLANK_SIZE; i++) + EMU8000_SMLD_WRITE(rec->emu, 0); + } + } + + setup_voice(rec, 0); + if (rec->voices > 1) + setup_voice(rec, 1); + return 0; +} + +static snd_pcm_uframes_t emu8k_pcm_pointer(snd_pcm_substream_t *subs) +{ + emu8k_pcm_t *rec = subs->runtime->private_data; + if (rec->running) + return emu8k_get_curpos(rec, 0); + return 0; +} + + +static snd_pcm_ops_t emu8k_pcm_ops = { + .open = emu8k_pcm_open, + .close = emu8k_pcm_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = emu8k_pcm_hw_params, + .hw_free = emu8k_pcm_hw_free, + .prepare = emu8k_pcm_prepare, + .trigger = emu8k_pcm_trigger, + .pointer = emu8k_pcm_pointer, + .copy = emu8k_pcm_copy, + .silence = emu8k_pcm_silence, +}; + + +static void snd_emu8000_pcm_free(snd_pcm_t *pcm) +{ + emu8000_t *emu = pcm->private_data; + emu->pcm = NULL; +} + +int snd_emu8000_pcm_new(snd_card_t *card, emu8000_t *emu, int index) +{ + snd_pcm_t *pcm; + int err; + + if ((err = snd_pcm_new(card, "Emu8000 PCM", index, 1, 0, &pcm)) < 0) + return err; + pcm->private_data = emu; + pcm->private_free = snd_emu8000_pcm_free; + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &emu8k_pcm_ops); + emu->pcm = pcm; + + snd_device_register(card, pcm); + + return 0; +} |