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261 lines
6.3 KiB
261 lines
6.3 KiB
// 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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unsigned long flag; |
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spin_lock_irqsave(&tscm->lock, flag); |
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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_irqrestore(&tscm->lock, flag); |
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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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