diff options
| -rw-r--r-- | sound/firewire/motu/Makefile | 2 | ||||
| -rw-r--r-- | sound/firewire/motu/amdtp-motu.c | 292 | ||||
| -rw-r--r-- | sound/firewire/motu/motu.h | 13 |
3 files changed, 304 insertions, 3 deletions
diff --git a/sound/firewire/motu/Makefile b/sound/firewire/motu/Makefile index d7819d57eadf..37391f5c623d 100644 --- a/sound/firewire/motu/Makefile +++ b/sound/firewire/motu/Makefile @@ -1,2 +1,2 @@ -snd-firewire-motu-objs := motu.o +snd-firewire-motu-objs := motu.o amdtp-motu.o obj-$(CONFIG_SND_FIREWIRE_MOTU) += snd-firewire-motu.o diff --git a/sound/firewire/motu/amdtp-motu.c b/sound/firewire/motu/amdtp-motu.c new file mode 100644 index 000000000000..11e44123ad65 --- /dev/null +++ b/sound/firewire/motu/amdtp-motu.c @@ -0,0 +1,292 @@ +/* + * amdtp-motu.c - a part of driver for MOTU FireWire series + * + * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp> + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +#include <linux/slab.h> +#include <sound/pcm.h> +#include "motu.h" + +#define CIP_FMT_MOTU 0x02 +#define MOTU_FDF_AM824 0x22 + +struct amdtp_motu { + /* For timestamp processing. */ + unsigned int quotient_ticks_per_event; + unsigned int remainder_ticks_per_event; + unsigned int next_ticks; + unsigned int next_accumulated; + unsigned int next_cycles; + unsigned int next_seconds; + + unsigned int pcm_chunks; + unsigned int pcm_byte_offset; +}; + +int amdtp_motu_set_parameters(struct amdtp_stream *s, unsigned int rate, + struct snd_motu_packet_format *formats) +{ + static const struct { + unsigned int quotient_ticks_per_event; + unsigned int remainder_ticks_per_event; + } params[] = { + [CIP_SFC_44100] = { 557, 123 }, + [CIP_SFC_48000] = { 512, 0 }, + [CIP_SFC_88200] = { 278, 282 }, + [CIP_SFC_96000] = { 256, 0 }, + [CIP_SFC_176400] = { 139, 141 }, + [CIP_SFC_192000] = { 128, 0 }, + }; + struct amdtp_motu *p = s->protocol; + unsigned int pcm_chunks, data_chunks, data_block_quadlets; + unsigned int delay; + unsigned int mode; + int i, err; + + if (amdtp_stream_running(s)) + return -EBUSY; + + for (i = 0; i < ARRAY_SIZE(snd_motu_clock_rates); ++i) { + if (snd_motu_clock_rates[i] == rate) { + mode = i >> 1; + break; + } + } + if (i == ARRAY_SIZE(snd_motu_clock_rates)) + return -EINVAL; + + pcm_chunks = formats->fixed_part_pcm_chunks[mode] + + formats->differed_part_pcm_chunks[mode]; + data_chunks = formats->msg_chunks + pcm_chunks; + + /* + * Each data block includes SPH in its head. Data chunks follow with + * 3 byte alignment. Padding follows with zero to conform to quadlet + * alignment. + */ + data_block_quadlets = 1 + DIV_ROUND_UP(data_chunks * 3, 4); + + err = amdtp_stream_set_parameters(s, rate, data_block_quadlets); + if (err < 0) + return err; + + p->pcm_chunks = pcm_chunks; + p->pcm_byte_offset = formats->pcm_byte_offset; + + /* IEEE 1394 bus requires. */ + delay = 0x2e00; + + /* For no-data or empty packets to adjust PCM sampling frequency. */ + delay += 8000 * 3072 * s->syt_interval / rate; + + p->next_seconds = 0; + p->next_cycles = delay / 3072; + p->quotient_ticks_per_event = params[s->sfc].quotient_ticks_per_event; + p->remainder_ticks_per_event = params[s->sfc].remainder_ticks_per_event; + p->next_ticks = delay % 3072; + p->next_accumulated = 0; + + return 0; +} + +static void read_pcm_s32(struct amdtp_stream *s, + struct snd_pcm_runtime *runtime, + __be32 *buffer, unsigned int data_blocks) +{ + struct amdtp_motu *p = s->protocol; + unsigned int channels, remaining_frames, i, c; + u8 *byte; + u32 *dst; + + channels = p->pcm_chunks; + dst = (void *)runtime->dma_area + + frames_to_bytes(runtime, s->pcm_buffer_pointer); + remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; + + for (i = 0; i < data_blocks; ++i) { + byte = (u8 *)buffer + p->pcm_byte_offset; + + for (c = 0; c < channels; ++c) { + *dst = (byte[0] << 24) | (byte[1] << 16) | byte[2]; + byte += 3; + dst++; + } + buffer += s->data_block_quadlets; + if (--remaining_frames == 0) + dst = (void *)runtime->dma_area; + } +} + +static void write_pcm_s32(struct amdtp_stream *s, + struct snd_pcm_runtime *runtime, + __be32 *buffer, unsigned int data_blocks) +{ + struct amdtp_motu *p = s->protocol; + unsigned int channels, remaining_frames, i, c; + u8 *byte; + const u32 *src; + + channels = p->pcm_chunks; + src = (void *)runtime->dma_area + + frames_to_bytes(runtime, s->pcm_buffer_pointer); + remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; + + for (i = 0; i < data_blocks; ++i) { + byte = (u8 *)buffer + p->pcm_byte_offset; + + for (c = 0; c < channels; ++c) { + byte[0] = (*src >> 24) & 0xff; + byte[1] = (*src >> 16) & 0xff; + byte[2] = (*src >> 8) & 0xff; + byte += 3; + src++; + } + + buffer += s->data_block_quadlets; + if (--remaining_frames == 0) + src = (void *)runtime->dma_area; + } +} + +static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer, + unsigned int data_blocks) +{ + struct amdtp_motu *p = s->protocol; + unsigned int channels, i, c; + u8 *byte; + + channels = p->pcm_chunks; + + for (i = 0; i < data_blocks; ++i) { + byte = (u8 *)buffer + p->pcm_byte_offset; + + for (c = 0; c < channels; ++c) { + byte[0] = 0; + byte[1] = 0; + byte[2] = 0; + byte += 3; + } + + buffer += s->data_block_quadlets; + } +} + +int amdtp_motu_add_pcm_hw_constraints(struct amdtp_stream *s, + struct snd_pcm_runtime *runtime) +{ + int err; + + /* TODO: how to set an constraint for exactly 24bit PCM sample? */ + err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24); + if (err < 0) + return err; + + return amdtp_stream_add_pcm_hw_constraints(s, runtime); +} + +static unsigned int process_tx_data_blocks(struct amdtp_stream *s, + __be32 *buffer, unsigned int data_blocks, + unsigned int *syt) +{ + struct snd_pcm_substream *pcm; + + pcm = ACCESS_ONCE(s->pcm); + if (data_blocks > 0 && pcm) + read_pcm_s32(s, pcm->runtime, buffer, data_blocks); + + return data_blocks; +} + +static inline void compute_next_elapse_from_start(struct amdtp_motu *p) +{ + p->next_accumulated += p->remainder_ticks_per_event; + if (p->next_accumulated >= 441) { + p->next_accumulated -= 441; + p->next_ticks++; + } + + p->next_ticks += p->quotient_ticks_per_event; + if (p->next_ticks >= 3072) { + p->next_ticks -= 3072; + p->next_cycles++; + } + + if (p->next_cycles >= 8000) { + p->next_cycles -= 8000; + p->next_seconds++; + } + + if (p->next_seconds >= 128) + p->next_seconds -= 128; +} + +static void write_sph(struct amdtp_stream *s, __be32 *buffer, + unsigned int data_blocks) +{ + struct amdtp_motu *p = s->protocol; + unsigned int next_cycles; + unsigned int i; + u32 sph; + + for (i = 0; i < data_blocks; i++) { + next_cycles = (s->start_cycle + p->next_cycles) % 8000; + sph = ((next_cycles << 12) | p->next_ticks) & 0x01ffffff; + *buffer = cpu_to_be32(sph); + + compute_next_elapse_from_start(p); + + buffer += s->data_block_quadlets; + } +} + +static unsigned int process_rx_data_blocks(struct amdtp_stream *s, + __be32 *buffer, unsigned int data_blocks, + unsigned int *syt) +{ + struct snd_pcm_substream *pcm; + + /* Not used. */ + *syt = 0xffff; + + /* TODO: how to interact control messages between userspace? */ + + pcm = ACCESS_ONCE(s->pcm); + if (pcm) + write_pcm_s32(s, pcm->runtime, buffer, data_blocks); + else + write_pcm_silence(s, buffer, data_blocks); + + write_sph(s, buffer, data_blocks); + + return data_blocks; +} + +int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit, + enum amdtp_stream_direction dir, + const struct snd_motu_protocol *const protocol) +{ + amdtp_stream_process_data_blocks_t process_data_blocks; + int fmt = CIP_FMT_MOTU; + int flags = CIP_BLOCKING; + int err; + + if (dir == AMDTP_IN_STREAM) { + process_data_blocks = process_tx_data_blocks; + } else { + process_data_blocks = process_rx_data_blocks; + flags |= CIP_DBC_IS_END_EVENT; + } + + err = amdtp_stream_init(s, unit, dir, flags, fmt, process_data_blocks, + sizeof(struct amdtp_motu)); + if (err < 0) + return err; + + s->sph = 1; + s->fdf = MOTU_FDF_AM824; + + return 0; +} diff --git a/sound/firewire/motu/motu.h b/sound/firewire/motu/motu.h index cb6b57353cc1..cd1b3dd3e371 100644 --- a/sound/firewire/motu/motu.h +++ b/sound/firewire/motu/motu.h @@ -19,12 +19,12 @@ #include <sound/control.h> #include <sound/core.h> +#include <sound/pcm.h> #include "../lib.h" +#include "../amdtp-stream.h" struct snd_motu_packet_format { - unsigned char midi_flag_offset; - unsigned char midi_byte_offset; unsigned char pcm_byte_offset; unsigned char msg_chunks; @@ -46,6 +46,8 @@ struct snd_motu { /* For packet streaming */ struct snd_motu_packet_format tx_packet_formats; struct snd_motu_packet_format rx_packet_formats; + struct amdtp_stream tx_stream; + struct amdtp_stream rx_stream; }; enum snd_motu_spec_flags { @@ -97,4 +99,11 @@ struct snd_motu_spec { const struct snd_motu_protocol *const protocol; }; +int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit, + enum amdtp_stream_direction dir, + const struct snd_motu_protocol *const protocol); +int amdtp_motu_set_parameters(struct amdtp_stream *s, unsigned int rate, + struct snd_motu_packet_format *formats); +int amdtp_motu_add_pcm_hw_constraints(struct amdtp_stream *s, + struct snd_pcm_runtime *runtime); #endif |