1 files changed, 489 insertions, 0 deletions

diff --git a/sound/firewire/motu/amdtp-motu.c b/sound/firewire/motu/amdtp-motu.c
new file mode 100644
index 000000000..2fb52f481
--- /dev/null
+++ b/sound/firewire/motu/amdtp-motu.c
@@ -0,0 +1,489 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * amdtp-motu.c - a part of driver for MOTU FireWire series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
+ */
+
+#include <linux/slab.h>
+#include <sound/pcm.h>
+#include "motu.h"
+
+#define CREATE_TRACE_POINTS
+#include "amdtp-motu-trace.h"
+
+#define CIP_FMT_MOTU		0x02
+#define CIP_FMT_MOTU_TX_V3	0x22
+#define MOTU_FDF_AM824		0x22
+
+#define TICKS_PER_CYCLE		3072
+#define CYCLES_PER_SECOND	8000
+#define TICKS_PER_SECOND	(TICKS_PER_CYCLE * CYCLES_PER_SECOND)
+
+#define CIP_SPH_CYCLE_SHIFT	12
+#define CIP_SPH_CYCLE_MASK	0x01fff000
+#define CIP_SPH_OFFSET_MASK	0x00000fff
+
+/*
+ * Nominally 3125 bytes/second, but the MIDI port's clock might be
+ * 1% too slow, and the bus clock 100 ppm too fast.
+ */
+#define MIDI_BYTES_PER_SECOND	3093
+
+struct amdtp_motu {
+	unsigned int pcm_chunks;
+	unsigned int pcm_byte_offset;
+
+	struct snd_rawmidi_substream *midi;
+	unsigned int midi_ports;
+	unsigned int midi_flag_offset;
+	unsigned int midi_byte_offset;
+
+	int midi_db_count;
+	unsigned int midi_db_interval;
+
+	struct amdtp_motu_cache *cache;
+};
+
+int amdtp_motu_set_parameters(struct amdtp_stream *s, unsigned int rate,
+			      unsigned int midi_ports,
+			      struct snd_motu_packet_format *formats)
+{
+	struct amdtp_motu *p = s->protocol;
+	unsigned int pcm_chunks, data_chunks, data_block_quadlets;
+	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;
+
+	// Each data block includes SPH in its head. Data chunks follow with
+	// 3 byte alignment. Padding follows with zero to conform to quadlet
+	// alignment.
+	pcm_chunks = formats->pcm_chunks[mode];
+	data_chunks = formats->msg_chunks + pcm_chunks;
+	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;
+
+	p->midi_ports = midi_ports;
+	p->midi_flag_offset = formats->midi_flag_offset;
+	p->midi_byte_offset = formats->midi_byte_offset;
+
+	p->midi_db_count = 0;
+	p->midi_db_interval = rate / MIDI_BYTES_PER_SECOND;
+
+	return 0;
+}
+
+static void read_pcm_s32(struct amdtp_stream *s, struct snd_pcm_substream *pcm,
+			 __be32 *buffer, unsigned int data_blocks,
+			 unsigned int pcm_frames)
+{
+	struct amdtp_motu *p = s->protocol;
+	unsigned int channels = p->pcm_chunks;
+	struct snd_pcm_runtime *runtime = pcm->runtime;
+	unsigned int pcm_buffer_pointer;
+	int remaining_frames;
+	u8 *byte;
+	u32 *dst;
+	int i, c;
+
+	pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
+	pcm_buffer_pointer %= runtime->buffer_size;
+
+	dst = (void *)runtime->dma_area +
+				frames_to_bytes(runtime, pcm_buffer_pointer);
+	remaining_frames = runtime->buffer_size - 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] << 8);
+			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_substream *pcm,
+			  __be32 *buffer, unsigned int data_blocks,
+			  unsigned int pcm_frames)
+{
+	struct amdtp_motu *p = s->protocol;
+	unsigned int channels = p->pcm_chunks;
+	struct snd_pcm_runtime *runtime = pcm->runtime;
+	unsigned int pcm_buffer_pointer;
+	int remaining_frames;
+	u8 *byte;
+	const u32 *src;
+	int i, c;
+
+	pcm_buffer_pointer = s->pcm_buffer_pointer + pcm_frames;
+	pcm_buffer_pointer %= runtime->buffer_size;
+
+	src = (void *)runtime->dma_area +
+				frames_to_bytes(runtime, pcm_buffer_pointer);
+	remaining_frames = runtime->buffer_size - 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);
+}
+
+void amdtp_motu_midi_trigger(struct amdtp_stream *s, unsigned int port,
+			     struct snd_rawmidi_substream *midi)
+{
+	struct amdtp_motu *p = s->protocol;
+
+	if (port < p->midi_ports)
+		WRITE_ONCE(p->midi, midi);
+}
+
+static void write_midi_messages(struct amdtp_stream *s, __be32 *buffer,
+				unsigned int data_blocks)
+{
+	struct amdtp_motu *p = s->protocol;
+	struct snd_rawmidi_substream *midi = READ_ONCE(p->midi);
+	u8 *b;
+	int i;
+
+	for (i = 0; i < data_blocks; i++) {
+		b = (u8 *)buffer;
+
+		if (midi && p->midi_db_count == 0 &&
+		    snd_rawmidi_transmit(midi, b + p->midi_byte_offset, 1) == 1) {
+			b[p->midi_flag_offset] = 0x01;
+		} else {
+			b[p->midi_byte_offset] = 0x00;
+			b[p->midi_flag_offset] = 0x00;
+		}
+
+		buffer += s->data_block_quadlets;
+
+		if (--p->midi_db_count < 0)
+			p->midi_db_count = p->midi_db_interval;
+	}
+}
+
+static void read_midi_messages(struct amdtp_stream *s, __be32 *buffer,
+			       unsigned int data_blocks)
+{
+	struct amdtp_motu *p = s->protocol;
+	struct snd_rawmidi_substream *midi;
+	u8 *b;
+	int i;
+
+	for (i = 0; i < data_blocks; i++) {
+		b = (u8 *)buffer;
+		midi = READ_ONCE(p->midi);
+
+		if (midi && (b[p->midi_flag_offset] & 0x01))
+			snd_rawmidi_receive(midi, b + p->midi_byte_offset, 1);
+
+		buffer += s->data_block_quadlets;
+	}
+}
+
+/* For tracepoints. */
+static void __maybe_unused copy_sph(u32 *frames, __be32 *buffer,
+				    unsigned int data_blocks,
+				    unsigned int data_block_quadlets)
+{
+	unsigned int i;
+
+	for (i = 0; i < data_blocks; ++i) {
+		*frames = be32_to_cpu(*buffer);
+		buffer += data_block_quadlets;
+		frames++;
+	}
+}
+
+/* For tracepoints. */
+static void __maybe_unused copy_message(u64 *frames, __be32 *buffer,
+					unsigned int data_blocks,
+					unsigned int data_block_quadlets)
+{
+	unsigned int i;
+
+	/* This is just for v2/v3 protocol. */
+	for (i = 0; i < data_blocks; ++i) {
+		*frames = be32_to_cpu(buffer[1]);
+		*frames <<= 16;
+		*frames |= be32_to_cpu(buffer[2]) >> 16;
+		++frames;
+		buffer += data_block_quadlets;
+	}
+}
+
+static void probe_tracepoints_events(struct amdtp_stream *s,
+				     const struct pkt_desc *descs,
+				     unsigned int packets)
+{
+	int i;
+
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
+
+		trace_data_block_sph(s, data_blocks, buf);
+		trace_data_block_message(s, data_blocks, buf);
+	}
+}
+
+static void cache_event_offsets(struct amdtp_motu_cache *cache, const __be32 *buf,
+				unsigned int data_blocks, unsigned int data_block_quadlets)
+{
+	unsigned int *event_offsets = cache->event_offsets;
+	const unsigned int cache_size = cache->size;
+	unsigned int cache_tail = cache->tail;
+	unsigned int base_tick = cache->tx_cycle_count * TICKS_PER_CYCLE;
+	int i;
+
+	for (i = 0; i < data_blocks; ++i) {
+		u32 sph = be32_to_cpu(*buf);
+		unsigned int tick;
+
+		tick = ((sph & CIP_SPH_CYCLE_MASK) >> CIP_SPH_CYCLE_SHIFT) * TICKS_PER_CYCLE +
+		       (sph & CIP_SPH_OFFSET_MASK);
+
+		if (tick < base_tick)
+			tick += TICKS_PER_SECOND;
+		event_offsets[cache_tail] = tick - base_tick;
+
+		cache_tail = (cache_tail + 1) % cache_size;
+		buf += data_block_quadlets;
+	}
+
+	cache->tail = cache_tail;
+	cache->tx_cycle_count = (cache->tx_cycle_count + 1) % CYCLES_PER_SECOND;
+}
+
+static unsigned int process_ir_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
+{
+	struct snd_motu *motu = container_of(s, struct snd_motu, tx_stream);
+	struct amdtp_motu *p = s->protocol;
+	unsigned int pcm_frames = 0;
+	int i;
+
+	if (p->cache->tx_cycle_count == UINT_MAX)
+		p->cache->tx_cycle_count = (s->domain->processing_cycle.tx_start % CYCLES_PER_SECOND);
+
+	// For data block processing.
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
+
+		cache_event_offsets(p->cache, buf, data_blocks, s->data_block_quadlets);
+
+		if (pcm) {
+			read_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		}
+
+		if (p->midi_ports)
+			read_midi_messages(s, buf, data_blocks);
+	}
+
+	if (motu->spec->flags & SND_MOTU_SPEC_REGISTER_DSP) {
+		snd_motu_register_dsp_message_parser_parse(motu, descs, packets,
+							   s->data_block_quadlets);
+	} else if (motu->spec->flags & SND_MOTU_SPEC_COMMAND_DSP) {
+		snd_motu_command_dsp_message_parser_parse(motu, descs, packets,
+							  s->data_block_quadlets);
+	}
+
+	// For tracepoints.
+	if (trace_data_block_sph_enabled() ||
+	    trace_data_block_message_enabled())
+		probe_tracepoints_events(s, descs, packets);
+
+	return pcm_frames;
+}
+
+static void write_sph(struct amdtp_motu_cache *cache, __be32 *buffer, unsigned int data_blocks,
+		      unsigned int data_block_quadlets)
+{
+	unsigned int *event_offsets = cache->event_offsets;
+	const unsigned int cache_size = cache->size;
+	unsigned int cache_head = cache->head;
+	unsigned int base_tick = cache->rx_cycle_count * TICKS_PER_CYCLE;
+	int i;
+
+	for (i = 0; i < data_blocks; i++) {
+		unsigned int tick = (base_tick + event_offsets[cache_head]) % TICKS_PER_SECOND;
+		u32 sph = ((tick / TICKS_PER_CYCLE) << CIP_SPH_CYCLE_SHIFT) | (tick % TICKS_PER_CYCLE);
+		*buffer = cpu_to_be32(sph);
+
+		cache_head = (cache_head + 1) % cache_size;
+		buffer += data_block_quadlets;
+	}
+
+	cache->head = cache_head;
+	cache->rx_cycle_count = (cache->rx_cycle_count + 1) % CYCLES_PER_SECOND;
+}
+
+static unsigned int process_it_ctx_payloads(struct amdtp_stream *s,
+					    const struct pkt_desc *descs,
+					    unsigned int packets,
+					    struct snd_pcm_substream *pcm)
+{
+	struct amdtp_motu *p = s->protocol;
+	unsigned int pcm_frames = 0;
+	int i;
+
+	if (p->cache->rx_cycle_count == UINT_MAX)
+		p->cache->rx_cycle_count = (s->domain->processing_cycle.rx_start % CYCLES_PER_SECOND);
+
+	// For data block processing.
+	for (i = 0; i < packets; ++i) {
+		const struct pkt_desc *desc = descs + i;
+		__be32 *buf = desc->ctx_payload;
+		unsigned int data_blocks = desc->data_blocks;
+
+		if (pcm) {
+			write_pcm_s32(s, pcm, buf, data_blocks, pcm_frames);
+			pcm_frames += data_blocks;
+		} else {
+			write_pcm_silence(s, buf, data_blocks);
+		}
+
+		if (p->midi_ports)
+			write_midi_messages(s, buf, data_blocks);
+
+		write_sph(p->cache, buf, data_blocks, s->data_block_quadlets);
+	}
+
+	// For tracepoints.
+	if (trace_data_block_sph_enabled() ||
+	    trace_data_block_message_enabled())
+		probe_tracepoints_events(s, descs, packets);
+
+	return pcm_frames;
+}
+
+int amdtp_motu_init(struct amdtp_stream *s, struct fw_unit *unit,
+		    enum amdtp_stream_direction dir,
+		    const struct snd_motu_spec *spec, struct amdtp_motu_cache *cache)
+{
+	amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
+	int fmt = CIP_FMT_MOTU;
+	unsigned int flags = CIP_BLOCKING | CIP_UNAWARE_SYT;
+	struct amdtp_motu *p;
+	int err;
+
+	if (dir == AMDTP_IN_STREAM) {
+		process_ctx_payloads = process_ir_ctx_payloads;
+
+		/*
+		 * Units of version 3 transmits packets with invalid CIP header
+		 * against IEC 61883-1.
+		 */
+		if (spec->protocol_version == SND_MOTU_PROTOCOL_V3) {
+			flags |= CIP_WRONG_DBS |
+				 CIP_SKIP_DBC_ZERO_CHECK |
+				 CIP_HEADER_WITHOUT_EOH;
+			fmt = CIP_FMT_MOTU_TX_V3;
+		}
+
+		if (spec == &snd_motu_spec_8pre ||
+		    spec == &snd_motu_spec_ultralite) {
+			// 8pre has some quirks.
+			flags |= CIP_WRONG_DBS |
+				 CIP_SKIP_DBC_ZERO_CHECK;
+		}
+	} else {
+		process_ctx_payloads = process_it_ctx_payloads;
+		flags |= CIP_DBC_IS_END_EVENT;
+	}
+
+	err = amdtp_stream_init(s, unit, dir, flags, fmt, process_ctx_payloads,
+				sizeof(struct amdtp_motu));
+	if (err < 0)
+		return err;
+
+	s->sph = 1;
+
+	if (dir == AMDTP_OUT_STREAM) {
+		// Use fixed value for FDF field.
+		s->ctx_data.rx.fdf = MOTU_FDF_AM824;
+	}
+
+	p = s->protocol;
+	p->cache = cache;
+
+	return 0;
+}