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173 lines
4.3 KiB
173 lines
4.3 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* amdtp-ff.c - a part of driver for RME Fireface series |
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* |
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* Copyright (c) 2015-2017 Takashi Sakamoto |
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*/ |
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#include <sound/pcm.h> |
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#include "ff.h" |
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struct amdtp_ff { |
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unsigned int pcm_channels; |
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}; |
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int amdtp_ff_set_parameters(struct amdtp_stream *s, unsigned int rate, |
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unsigned int pcm_channels) |
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{ |
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struct amdtp_ff *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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p->pcm_channels = pcm_channels; |
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data_channels = pcm_channels; |
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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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__le32 *buffer, unsigned int frames, |
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unsigned int pcm_frames) |
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{ |
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struct amdtp_ff *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_le32(*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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__le32 *buffer, unsigned int frames, |
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unsigned int pcm_frames) |
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{ |
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struct amdtp_ff *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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for (i = 0; i < frames; ++i) { |
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for (c = 0; c < channels; ++c) { |
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*dst = le32_to_cpu(buffer[c]) & 0xffffff00; |
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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, |
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__le32 *buffer, unsigned int frames) |
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{ |
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struct amdtp_ff *p = s->protocol; |
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unsigned int i, c, channels = p->pcm_channels; |
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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_le32(0x00000000); |
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buffer += s->data_block_quadlets; |
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} |
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} |
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int amdtp_ff_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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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 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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__le32 *buf = (__le32 *)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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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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__le32 *buf = (__le32 *)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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} |
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return pcm_frames; |
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} |
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int amdtp_ff_init(struct amdtp_stream *s, struct fw_unit *unit, |
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enum amdtp_stream_direction dir) |
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{ |
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amdtp_stream_process_ctx_payloads_t process_ctx_payloads; |
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if (dir == AMDTP_IN_STREAM) |
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process_ctx_payloads = process_ir_ctx_payloads; |
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else |
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process_ctx_payloads = process_it_ctx_payloads; |
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return amdtp_stream_init(s, unit, dir, CIP_BLOCKING | CIP_UNAWARE_SYT | CIP_NO_HEADER, 0, |
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process_ctx_payloads, sizeof(struct amdtp_ff)); |
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}
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