2019-05-30 07:57:59 +08:00
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// SPDX-License-Identifier: GPL-2.0-only
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2015-09-19 10:21:55 +08:00
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/*
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* AM824 format in Audio and Music Data Transmission Protocol (IEC 61883-6)
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*
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2015-09-19 10:22:02 +08:00
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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2015-09-19 10:21:55 +08:00
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* Copyright (c) 2015 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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*/
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2015-09-19 10:22:02 +08:00
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#include <linux/slab.h>
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2015-09-19 10:21:55 +08:00
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#include "amdtp-am824.h"
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#define CIP_FMT_AM 0x10
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2015-09-19 10:21:56 +08:00
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/* "Clock-based rate control mode" is just supported. */
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#define AMDTP_FDF_AM824 0x00
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2015-09-19 10:22:02 +08:00
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/*
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* Nominally 3125 bytes/second, but the MIDI port's clock might be
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* 1% too slow, and the bus clock 100 ppm too fast.
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*/
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#define MIDI_BYTES_PER_SECOND 3093
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/*
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* Several devices look only at the first eight data blocks.
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* In any case, this is more than enough for the MIDI data rate.
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*/
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#define MAX_MIDI_RX_BLOCKS 8
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struct amdtp_am824 {
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struct snd_rawmidi_substream *midi[AM824_MAX_CHANNELS_FOR_MIDI * 8];
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int midi_fifo_limit;
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int midi_fifo_used[AM824_MAX_CHANNELS_FOR_MIDI * 8];
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unsigned int pcm_channels;
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unsigned int midi_ports;
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u8 pcm_positions[AM824_MAX_CHANNELS_FOR_PCM];
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u8 midi_position;
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};
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2015-09-19 10:21:56 +08:00
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/**
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* amdtp_am824_set_parameters - set stream parameters
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* @s: the AMDTP stream to configure
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* @rate: the sample rate
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* @pcm_channels: the number of PCM samples in each data block, to be encoded
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* as AM824 multi-bit linear audio
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* @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels)
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* @double_pcm_frames: one data block transfers two PCM frames
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*
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* The parameters must be set before the stream is started, and must not be
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* changed while the stream is running.
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*/
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int amdtp_am824_set_parameters(struct amdtp_stream *s, unsigned int rate,
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unsigned int pcm_channels,
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unsigned int midi_ports,
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bool double_pcm_frames)
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{
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2015-09-19 10:22:02 +08:00
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struct amdtp_am824 *p = s->protocol;
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unsigned int midi_channels;
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2023-01-10 21:49:31 +08:00
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unsigned int pcm_frame_multiplier;
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int i, err;
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2015-09-19 10:21:56 +08:00
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2015-09-19 10:22:02 +08:00
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if (amdtp_stream_running(s))
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return -EINVAL;
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if (pcm_channels > AM824_MAX_CHANNELS_FOR_PCM)
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return -EINVAL;
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midi_channels = DIV_ROUND_UP(midi_ports, 8);
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if (midi_channels > AM824_MAX_CHANNELS_FOR_MIDI)
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return -EINVAL;
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if (WARN_ON(amdtp_stream_running(s)) ||
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WARN_ON(pcm_channels > AM824_MAX_CHANNELS_FOR_PCM) ||
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WARN_ON(midi_channels > AM824_MAX_CHANNELS_FOR_MIDI))
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return -EINVAL;
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2023-01-10 21:49:31 +08:00
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/*
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* In IEC 61883-6, one data block represents one event. In ALSA, one
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* event equals to one PCM frame. But Dice has a quirk at higher
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* sampling rate to transfer two PCM frames in one data block.
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*/
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if (double_pcm_frames)
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pcm_frame_multiplier = 2;
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else
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pcm_frame_multiplier = 1;
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err = amdtp_stream_set_parameters(s, rate, pcm_channels + midi_channels,
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pcm_frame_multiplier);
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2015-09-19 10:21:56 +08:00
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if (err < 0)
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return err;
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2020-05-08 12:36:26 +08:00
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if (s->direction == AMDTP_OUT_STREAM)
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s->ctx_data.rx.fdf = AMDTP_FDF_AM824 | s->sfc;
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2015-09-19 10:21:56 +08:00
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2015-09-19 10:22:02 +08:00
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p->pcm_channels = pcm_channels;
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p->midi_ports = midi_ports;
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/* init the position map for PCM and MIDI channels */
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for (i = 0; i < pcm_channels; i++)
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p->pcm_positions[i] = i;
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p->midi_position = p->pcm_channels;
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/*
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* We do not know the actual MIDI FIFO size of most devices. Just
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* assume two bytes, i.e., one byte can be received over the bus while
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* the previous one is transmitted over MIDI.
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* (The value here is adjusted for midi_ratelimit_per_packet().)
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*/
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p->midi_fifo_limit = rate - MIDI_BYTES_PER_SECOND * s->syt_interval + 1;
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2015-09-19 10:21:56 +08:00
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return 0;
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}
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EXPORT_SYMBOL_GPL(amdtp_am824_set_parameters);
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2015-09-19 10:21:58 +08:00
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/**
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* amdtp_am824_set_pcm_position - set an index of data channel for a channel
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* of PCM frame
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* @s: the AMDTP stream
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* @index: the index of data channel in an data block
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* @position: the channel of PCM frame
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*/
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void amdtp_am824_set_pcm_position(struct amdtp_stream *s, unsigned int index,
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unsigned int position)
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{
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2015-09-19 10:22:02 +08:00
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struct amdtp_am824 *p = s->protocol;
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if (index < p->pcm_channels)
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p->pcm_positions[index] = position;
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2015-09-19 10:21:58 +08:00
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}
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EXPORT_SYMBOL_GPL(amdtp_am824_set_pcm_position);
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/**
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* amdtp_am824_set_midi_position - set a index of data channel for MIDI
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* conformant data channel
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* @s: the AMDTP stream
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* @position: the index of data channel in an data block
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*/
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void amdtp_am824_set_midi_position(struct amdtp_stream *s,
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unsigned int position)
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{
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2015-09-19 10:22:02 +08:00
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struct amdtp_am824 *p = s->protocol;
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p->midi_position = position;
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2015-09-19 10:21:58 +08:00
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}
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EXPORT_SYMBOL_GPL(amdtp_am824_set_midi_position);
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2019-07-22 11:37:04 +08:00
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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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2015-09-19 10:22:02 +08:00
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{
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struct amdtp_am824 *p = s->protocol;
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2019-07-22 11:37:04 +08:00
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unsigned int channels = p->pcm_channels;
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2015-09-19 10:22:02 +08:00
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struct snd_pcm_runtime *runtime = pcm->runtime;
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2019-07-22 11:37:04 +08:00
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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2015-09-19 10:22:02 +08:00
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const u32 *src;
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2019-07-22 11:37:04 +08:00
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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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2015-09-19 10:22:02 +08:00
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src = (void *)runtime->dma_area +
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2019-07-22 11:37:04 +08:00
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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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2015-09-19 10:22:02 +08:00
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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[p->pcm_positions[c]] =
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cpu_to_be32((*src >> 8) | 0x40000000);
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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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2019-07-22 11:37:04 +08:00
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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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2015-09-19 10:22:02 +08:00
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{
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struct amdtp_am824 *p = s->protocol;
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2019-07-22 11:37:04 +08:00
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unsigned int channels = p->pcm_channels;
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2015-09-19 10:22:02 +08:00
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struct snd_pcm_runtime *runtime = pcm->runtime;
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2019-07-22 11:37:04 +08:00
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unsigned int pcm_buffer_pointer;
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int remaining_frames;
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2015-09-19 10:22:02 +08:00
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u32 *dst;
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2019-07-22 11:37:04 +08:00
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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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2015-09-19 10:22:02 +08:00
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dst = (void *)runtime->dma_area +
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2019-07-22 11:37:04 +08:00
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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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2015-09-19 10:22:02 +08:00
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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[p->pcm_positions[c]]) << 8;
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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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__be32 *buffer, unsigned int frames)
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{
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struct amdtp_am824 *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[p->pcm_positions[c]] = cpu_to_be32(0x40000000);
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buffer += s->data_block_quadlets;
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}
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}
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2015-09-19 10:21:57 +08:00
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/**
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* amdtp_am824_add_pcm_hw_constraints - add hw constraints for PCM substream
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* @s: the AMDTP stream for AM824 data block, must be initialized.
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* @runtime: the PCM substream runtime
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*
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*/
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int amdtp_am824_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 = amdtp_stream_add_pcm_hw_constraints(s, runtime);
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if (err < 0)
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return err;
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/* AM824 in IEC 61883-6 can deliver 24bit data. */
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return snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
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}
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EXPORT_SYMBOL_GPL(amdtp_am824_add_pcm_hw_constraints);
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2015-09-19 10:21:59 +08:00
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/**
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* amdtp_am824_midi_trigger - start/stop playback/capture with a MIDI device
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* @s: the AMDTP stream
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* @port: index of MIDI port
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* @midi: the MIDI device to be started, or %NULL to stop the current device
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*
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* Call this function on a running isochronous stream to enable the actual
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* transmission of MIDI data. This function should be called from the MIDI
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* device's .trigger callback.
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*/
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void amdtp_am824_midi_trigger(struct amdtp_stream *s, unsigned int port,
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struct snd_rawmidi_substream *midi)
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{
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2015-09-19 10:22:02 +08:00
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struct amdtp_am824 *p = s->protocol;
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if (port < p->midi_ports)
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locking/atomics: COCCINELLE/treewide: Convert trivial ACCESS_ONCE() patterns to READ_ONCE()/WRITE_ONCE()
Please do not apply this to mainline directly, instead please re-run the
coccinelle script shown below and apply its output.
For several reasons, it is desirable to use {READ,WRITE}_ONCE() in
preference to ACCESS_ONCE(), and new code is expected to use one of the
former. So far, there's been no reason to change most existing uses of
ACCESS_ONCE(), as these aren't harmful, and changing them results in
churn.
However, for some features, the read/write distinction is critical to
correct operation. To distinguish these cases, separate read/write
accessors must be used. This patch migrates (most) remaining
ACCESS_ONCE() instances to {READ,WRITE}_ONCE(), using the following
coccinelle script:
----
// Convert trivial ACCESS_ONCE() uses to equivalent READ_ONCE() and
// WRITE_ONCE()
// $ make coccicheck COCCI=/home/mark/once.cocci SPFLAGS="--include-headers" MODE=patch
virtual patch
@ depends on patch @
expression E1, E2;
@@
- ACCESS_ONCE(E1) = E2
+ WRITE_ONCE(E1, E2)
@ depends on patch @
expression E;
@@
- ACCESS_ONCE(E)
+ READ_ONCE(E)
----
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: davem@davemloft.net
Cc: linux-arch@vger.kernel.org
Cc: mpe@ellerman.id.au
Cc: shuah@kernel.org
Cc: snitzer@redhat.com
Cc: thor.thayer@linux.intel.com
Cc: tj@kernel.org
Cc: viro@zeniv.linux.org.uk
Cc: will.deacon@arm.com
Link: http://lkml.kernel.org/r/1508792849-3115-19-git-send-email-paulmck@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-10-24 05:07:29 +08:00
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WRITE_ONCE(p->midi[port], midi);
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2015-09-19 10:21:59 +08:00
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}
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EXPORT_SYMBOL_GPL(amdtp_am824_midi_trigger);
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2015-09-19 10:22:02 +08:00
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/*
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* To avoid sending MIDI bytes at too high a rate, assume that the receiving
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* device has a FIFO, and track how much it is filled. This values increases
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* by one whenever we send one byte in a packet, but the FIFO empties at
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* a constant rate independent of our packet rate. One packet has syt_interval
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* samples, so the number of bytes that empty out of the FIFO, per packet(!),
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* is MIDI_BYTES_PER_SECOND * syt_interval / sample_rate. To avoid storing
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* fractional values, the values in midi_fifo_used[] are measured in bytes
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* multiplied by the sample rate.
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*/
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static bool midi_ratelimit_per_packet(struct amdtp_stream *s, unsigned int port)
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{
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struct amdtp_am824 *p = s->protocol;
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int used;
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used = p->midi_fifo_used[port];
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if (used == 0) /* common shortcut */
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return true;
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used -= MIDI_BYTES_PER_SECOND * s->syt_interval;
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used = max(used, 0);
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p->midi_fifo_used[port] = used;
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return used < p->midi_fifo_limit;
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}
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static void midi_rate_use_one_byte(struct amdtp_stream *s, unsigned int port)
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{
|
|
|
|
struct amdtp_am824 *p = s->protocol;
|
|
|
|
|
|
|
|
p->midi_fifo_used[port] += amdtp_rate_table[s->sfc];
|
|
|
|
}
|
|
|
|
|
|
|
|
static void write_midi_messages(struct amdtp_stream *s, __be32 *buffer,
|
2019-07-22 11:36:53 +08:00
|
|
|
unsigned int frames, unsigned int data_block_counter)
|
2015-09-19 10:22:02 +08:00
|
|
|
{
|
|
|
|
struct amdtp_am824 *p = s->protocol;
|
|
|
|
unsigned int f, port;
|
|
|
|
u8 *b;
|
|
|
|
|
|
|
|
for (f = 0; f < frames; f++) {
|
|
|
|
b = (u8 *)&buffer[p->midi_position];
|
|
|
|
|
2019-07-22 11:36:53 +08:00
|
|
|
port = (data_block_counter + f) % 8;
|
2015-09-19 10:22:02 +08:00
|
|
|
if (f < MAX_MIDI_RX_BLOCKS &&
|
|
|
|
midi_ratelimit_per_packet(s, port) &&
|
|
|
|
p->midi[port] != NULL &&
|
|
|
|
snd_rawmidi_transmit(p->midi[port], &b[1], 1) == 1) {
|
|
|
|
midi_rate_use_one_byte(s, port);
|
|
|
|
b[0] = 0x81;
|
|
|
|
} else {
|
|
|
|
b[0] = 0x80;
|
|
|
|
b[1] = 0;
|
|
|
|
}
|
|
|
|
b[2] = 0;
|
|
|
|
b[3] = 0;
|
|
|
|
|
|
|
|
buffer += s->data_block_quadlets;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-07-22 11:36:53 +08:00
|
|
|
static void read_midi_messages(struct amdtp_stream *s, __be32 *buffer,
|
|
|
|
unsigned int frames, unsigned int data_block_counter)
|
2015-09-19 10:22:02 +08:00
|
|
|
{
|
|
|
|
struct amdtp_am824 *p = s->protocol;
|
|
|
|
int len;
|
|
|
|
u8 *b;
|
2019-07-22 11:36:51 +08:00
|
|
|
int f;
|
2015-09-19 10:22:02 +08:00
|
|
|
|
|
|
|
for (f = 0; f < frames; f++) {
|
2019-07-22 11:36:51 +08:00
|
|
|
unsigned int port = f;
|
|
|
|
|
|
|
|
if (!(s->flags & CIP_UNALIGHED_DBC))
|
2019-07-22 11:36:53 +08:00
|
|
|
port += data_block_counter;
|
2019-07-22 11:36:51 +08:00
|
|
|
port %= 8;
|
2015-09-19 10:22:02 +08:00
|
|
|
b = (u8 *)&buffer[p->midi_position];
|
|
|
|
|
|
|
|
len = b[0] - 0x80;
|
|
|
|
if ((1 <= len) && (len <= 3) && (p->midi[port]))
|
|
|
|
snd_rawmidi_receive(p->midi[port], b + 1, len);
|
|
|
|
|
|
|
|
buffer += s->data_block_quadlets;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2023-01-10 21:49:32 +08:00
|
|
|
static void process_it_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
|
|
|
|
unsigned int count, struct snd_pcm_substream *pcm)
|
2015-09-19 10:22:02 +08:00
|
|
|
{
|
|
|
|
struct amdtp_am824 *p = s->protocol;
|
2019-07-22 11:37:04 +08:00
|
|
|
unsigned int pcm_frames = 0;
|
2019-07-22 11:37:09 +08:00
|
|
|
int i;
|
2015-09-19 10:22:02 +08:00
|
|
|
|
2023-01-09 10:17:37 +08:00
|
|
|
for (i = 0; i < count; ++i) {
|
2019-07-22 11:37:09 +08:00
|
|
|
__be32 *buf = desc->ctx_payload;
|
|
|
|
unsigned int data_blocks = desc->data_blocks;
|
2015-09-19 10:22:02 +08:00
|
|
|
|
2019-07-22 11:37:09 +08:00
|
|
|
if (pcm) {
|
|
|
|
write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
|
2023-01-10 21:49:31 +08:00
|
|
|
pcm_frames += data_blocks * s->pcm_frame_multiplier;
|
2019-07-22 11:37:09 +08:00
|
|
|
} else {
|
|
|
|
write_pcm_silence(s, buf, data_blocks);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (p->midi_ports) {
|
|
|
|
write_midi_messages(s, buf, data_blocks,
|
|
|
|
desc->data_block_counter);
|
|
|
|
}
|
2023-01-09 10:17:37 +08:00
|
|
|
|
|
|
|
desc = amdtp_stream_next_packet_desc(s, desc);
|
2019-07-22 11:37:03 +08:00
|
|
|
}
|
2015-09-19 10:22:02 +08:00
|
|
|
}
|
|
|
|
|
2023-01-10 21:49:32 +08:00
|
|
|
static void process_ir_ctx_payloads(struct amdtp_stream *s, const struct pkt_desc *desc,
|
|
|
|
unsigned int count, struct snd_pcm_substream *pcm)
|
2015-09-19 10:22:02 +08:00
|
|
|
{
|
|
|
|
struct amdtp_am824 *p = s->protocol;
|
2019-07-22 11:37:04 +08:00
|
|
|
unsigned int pcm_frames = 0;
|
2019-07-22 11:37:09 +08:00
|
|
|
int i;
|
2015-09-19 10:22:02 +08:00
|
|
|
|
2023-01-09 10:17:37 +08:00
|
|
|
for (i = 0; i < count; ++i) {
|
2019-07-22 11:37:09 +08:00
|
|
|
__be32 *buf = desc->ctx_payload;
|
|
|
|
unsigned int data_blocks = desc->data_blocks;
|
|
|
|
|
|
|
|
if (pcm) {
|
|
|
|
read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
|
2023-01-10 21:49:31 +08:00
|
|
|
pcm_frames += data_blocks * s->pcm_frame_multiplier;
|
2019-07-22 11:37:09 +08:00
|
|
|
}
|
2015-09-19 10:22:02 +08:00
|
|
|
|
2019-07-22 11:37:09 +08:00
|
|
|
if (p->midi_ports) {
|
|
|
|
read_midi_messages(s, buf, data_blocks,
|
|
|
|
desc->data_block_counter);
|
|
|
|
}
|
2023-01-09 10:17:37 +08:00
|
|
|
|
|
|
|
desc = amdtp_stream_next_packet_desc(s, desc);
|
2019-07-22 11:37:03 +08:00
|
|
|
}
|
2015-09-19 10:22:02 +08:00
|
|
|
}
|
|
|
|
|
2015-09-19 10:21:55 +08:00
|
|
|
/**
|
|
|
|
* amdtp_am824_init - initialize an AMDTP stream structure to handle AM824
|
|
|
|
* data block
|
|
|
|
* @s: the AMDTP stream to initialize
|
|
|
|
* @unit: the target of the stream
|
|
|
|
* @dir: the direction of stream
|
2021-05-18 16:45:48 +08:00
|
|
|
* @flags: the details of the streaming protocol consist of cip_flags enumeration-constants.
|
2015-09-19 10:21:55 +08:00
|
|
|
*/
|
|
|
|
int amdtp_am824_init(struct amdtp_stream *s, struct fw_unit *unit,
|
2021-05-18 16:45:48 +08:00
|
|
|
enum amdtp_stream_direction dir, unsigned int flags)
|
2015-09-19 10:21:55 +08:00
|
|
|
{
|
2019-07-22 11:37:09 +08:00
|
|
|
amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
|
2015-09-19 10:22:02 +08:00
|
|
|
|
|
|
|
if (dir == AMDTP_IN_STREAM)
|
2019-07-22 11:37:09 +08:00
|
|
|
process_ctx_payloads = process_ir_ctx_payloads;
|
2015-09-19 10:22:02 +08:00
|
|
|
else
|
2019-07-22 11:37:09 +08:00
|
|
|
process_ctx_payloads = process_it_ctx_payloads;
|
2015-09-19 10:22:02 +08:00
|
|
|
|
|
|
|
return amdtp_stream_init(s, unit, dir, flags, CIP_FMT_AM,
|
2019-07-22 11:37:09 +08:00
|
|
|
process_ctx_payloads, sizeof(struct amdtp_am824));
|
2015-09-19 10:21:55 +08:00
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(amdtp_am824_init);
|