261 lines
6.3 KiB
C
261 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* amdtp-tascam.c - a part of driver for TASCAM FireWire series
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*
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* Copyright (c) 2015 Takashi Sakamoto
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*/
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#include <sound/pcm.h>
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#include "tascam.h"
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#define AMDTP_FMT_TSCM_TX 0x1e
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#define AMDTP_FMT_TSCM_RX 0x3e
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struct amdtp_tscm {
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unsigned int pcm_channels;
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};
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int amdtp_tscm_set_parameters(struct amdtp_stream *s, unsigned int rate)
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{
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struct amdtp_tscm *p = s->protocol;
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unsigned int data_channels;
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if (amdtp_stream_running(s))
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return -EBUSY;
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data_channels = p->pcm_channels;
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/* Packets in in-stream have extra 2 data channels. */
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if (s->direction == AMDTP_IN_STREAM)
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data_channels += 2;
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return amdtp_stream_set_parameters(s, rate, data_channels);
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}
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static void write_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int frames,
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unsigned int pcm_frames)
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{
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struct amdtp_tscm *p = s->protocol;
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unsigned int channels = p->pcm_channels;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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const u32 *src;
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int i, c;
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pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
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pcm_buffer_pointer %= runtime->buffer_size;
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src = (void *)runtime->dma_area +
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frames_to_bytes(runtime, pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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buffer[c] = cpu_to_be32(*src);
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src++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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src = (void *)runtime->dma_area;
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}
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}
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static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int frames,
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unsigned int pcm_frames)
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{
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struct amdtp_tscm *p = s->protocol;
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unsigned int channels = p->pcm_channels;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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u32 *dst;
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int i, c;
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pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
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pcm_buffer_pointer %= runtime->buffer_size;
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dst = (void *)runtime->dma_area +
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frames_to_bytes(runtime, pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - pcm_buffer_pointer;
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/* The first data channel is for event counter. */
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buffer += 1;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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*dst = be32_to_cpu(buffer[c]);
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dst++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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dst = (void *)runtime->dma_area;
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}
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}
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static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer,
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unsigned int data_blocks)
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{
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struct amdtp_tscm *p = s->protocol;
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unsigned int channels, i, c;
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channels = p->pcm_channels;
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for (i = 0; i < data_blocks; ++i) {
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for (c = 0; c < channels; ++c)
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buffer[c] = 0x00000000;
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buffer += s->data_block_quadlets;
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}
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}
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int amdtp_tscm_add_pcm_hw_constraints(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime)
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{
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int err;
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/*
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* Our implementation allows this protocol to deliver 24 bit sample in
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* 32bit data channel.
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*/
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err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
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if (err < 0)
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return err;
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return amdtp_stream_add_pcm_hw_constraints(s, runtime);
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}
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static void read_status_messages(struct amdtp_stream *s,
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__be32 *buffer, unsigned int data_blocks)
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{
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struct snd_tscm *tscm = container_of(s, struct snd_tscm, tx_stream);
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bool used = READ_ONCE(tscm->hwdep->used);
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int i;
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for (i = 0; i < data_blocks; i++) {
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unsigned int index;
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__be32 before;
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__be32 after;
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index = be32_to_cpu(buffer[0]) % SNDRV_FIREWIRE_TASCAM_STATE_COUNT;
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before = tscm->state[index];
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after = buffer[s->data_block_quadlets - 1];
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if (used && index > 4 && index < 16) {
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__be32 mask;
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if (index == 5)
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mask = cpu_to_be32(~0x0000ffff);
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else if (index == 6)
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mask = cpu_to_be32(~0x0000ffff);
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else if (index == 8)
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mask = cpu_to_be32(~0x000f0f00);
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else
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mask = cpu_to_be32(~0x00000000);
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if ((before ^ after) & mask) {
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struct snd_firewire_tascam_change *entry =
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&tscm->queue[tscm->push_pos];
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spin_lock_irq(&tscm->lock);
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entry->index = index;
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entry->before = before;
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entry->after = after;
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if (++tscm->push_pos >= SND_TSCM_QUEUE_COUNT)
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tscm->push_pos = 0;
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spin_unlock_irq(&tscm->lock);
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wake_up(&tscm->hwdep_wait);
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}
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}
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tscm->state[index] = after;
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buffer += s->data_block_quadlets;
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}
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}
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static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
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const struct pkt_desc *descs,
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unsigned int packets,
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struct snd_pcm_substream *pcm)
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{
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unsigned int pcm_frames = 0;
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int i;
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for (i = 0; i < packets; ++i) {
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const struct pkt_desc *desc = descs + i;
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__be32 *buf = desc->ctx_payload;
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unsigned int data_blocks = desc->data_blocks;
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if (pcm) {
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read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
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pcm_frames += data_blocks;
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}
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read_status_messages(s, buf, data_blocks);
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}
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return pcm_frames;
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}
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static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
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const struct pkt_desc *descs,
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unsigned int packets,
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struct snd_pcm_substream *pcm)
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{
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unsigned int pcm_frames = 0;
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int i;
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for (i = 0; i < packets; ++i) {
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const struct pkt_desc *desc = descs + i;
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__be32 *buf = desc->ctx_payload;
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unsigned int data_blocks = desc->data_blocks;
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if (pcm) {
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write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
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pcm_frames += data_blocks;
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} else {
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write_pcm_silence(s, buf, data_blocks);
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}
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}
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return pcm_frames;
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}
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int amdtp_tscm_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir, unsigned int pcm_channels)
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{
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amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
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struct amdtp_tscm *p;
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unsigned int fmt;
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int err;
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if (dir == AMDTP_IN_STREAM) {
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fmt = AMDTP_FMT_TSCM_TX;
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process_ctx_payloads = process_ir_ctx_payloads;
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} else {
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fmt = AMDTP_FMT_TSCM_RX;
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process_ctx_payloads = process_it_ctx_payloads;
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}
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err = amdtp_stream_init(s, unit, dir,
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CIP_NONBLOCKING | CIP_SKIP_DBC_ZERO_CHECK, fmt,
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process_ctx_payloads, sizeof(struct amdtp_tscm));
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if (err < 0)
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return 0;
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if (dir == AMDTP_OUT_STREAM) {
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// Use fixed value for FDF field.
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s->ctx_data.rx.fdf = 0x00;
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// Not used.
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s->ctx_data.rx.syt_override = 0x0000;
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}
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/* This protocol uses fixed number of data channels for PCM samples. */
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p = s->protocol;
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p->pcm_channels = pcm_channels;
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return 0;
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}
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