Linux-libre 4.4-gnupck-4.4-gnu

1 files changed, 0 insertions, 1108 deletions

diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
deleted file mode 100644
index 2a153d260..000000000
--- a/sound/firewire/amdtp.c
+++ /dev/null
@@ -1,1108 +0,0 @@
-/*
- * Audio and Music Data Transmission Protocol (IEC 61883-6) streams
- * with Common Isochronous Packet (IEC 61883-1) headers
- *
- * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
- * Licensed under the terms of the GNU General Public License, version 2.
- */
-
-#include <linux/device.h>
-#include <linux/err.h>
-#include <linux/firewire.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/sched.h>
-#include <sound/pcm.h>
-#include <sound/pcm_params.h>
-#include <sound/rawmidi.h>
-#include "amdtp.h"
-
-#define TICKS_PER_CYCLE		3072
-#define CYCLES_PER_SECOND	8000
-#define TICKS_PER_SECOND	(TICKS_PER_CYCLE * CYCLES_PER_SECOND)
-
-/*
- * 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
-
-/*
- * Several devices look only at the first eight data blocks.
- * In any case, this is more than enough for the MIDI data rate.
- */
-#define MAX_MIDI_RX_BLOCKS	8
-
-#define TRANSFER_DELAY_TICKS	0x2e00 /* 479.17 microseconds */
-
-/* isochronous header parameters */
-#define ISO_DATA_LENGTH_SHIFT	16
-#define TAG_CIP			1
-
-/* common isochronous packet header parameters */
-#define CIP_EOH_SHIFT		31
-#define CIP_EOH			(1u << CIP_EOH_SHIFT)
-#define CIP_EOH_MASK		0x80000000
-#define CIP_SID_SHIFT		24
-#define CIP_SID_MASK		0x3f000000
-#define CIP_DBS_MASK		0x00ff0000
-#define CIP_DBS_SHIFT		16
-#define CIP_DBC_MASK		0x000000ff
-#define CIP_FMT_SHIFT		24
-#define CIP_FMT_MASK		0x3f000000
-#define CIP_FDF_MASK		0x00ff0000
-#define CIP_FDF_SHIFT		16
-#define CIP_SYT_MASK		0x0000ffff
-#define CIP_SYT_NO_INFO		0xffff
-
-/*
- * Audio and Music transfer protocol specific parameters
- * only "Clock-based rate control mode" is supported
- */
-#define CIP_FMT_AM		(0x10 << CIP_FMT_SHIFT)
-#define AMDTP_FDF_AM824		(0 << (CIP_FDF_SHIFT + 3))
-#define AMDTP_FDF_NO_DATA	0xff
-
-/* TODO: make these configurable */
-#define INTERRUPT_INTERVAL	16
-#define QUEUE_LENGTH		48
-
-#define IN_PACKET_HEADER_SIZE	4
-#define OUT_PACKET_HEADER_SIZE	0
-
-static void pcm_period_tasklet(unsigned long data);
-
-/**
- * amdtp_stream_init - initialize an AMDTP stream structure
- * @s: the AMDTP stream to initialize
- * @unit: the target of the stream
- * @dir: the direction of stream
- * @flags: the packet transmission method to use
- */
-int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
-		      enum amdtp_stream_direction dir, enum cip_flags flags)
-{
-	s->unit = unit;
-	s->direction = dir;
-	s->flags = flags;
-	s->context = ERR_PTR(-1);
-	mutex_init(&s->mutex);
-	tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s);
-	s->packet_index = 0;
-
-	init_waitqueue_head(&s->callback_wait);
-	s->callbacked = false;
-	s->sync_slave = NULL;
-
-	return 0;
-}
-EXPORT_SYMBOL(amdtp_stream_init);
-
-/**
- * amdtp_stream_destroy - free stream resources
- * @s: the AMDTP stream to destroy
- */
-void amdtp_stream_destroy(struct amdtp_stream *s)
-{
-	WARN_ON(amdtp_stream_running(s));
-	mutex_destroy(&s->mutex);
-}
-EXPORT_SYMBOL(amdtp_stream_destroy);
-
-const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = {
-	[CIP_SFC_32000]  =  8,
-	[CIP_SFC_44100]  =  8,
-	[CIP_SFC_48000]  =  8,
-	[CIP_SFC_88200]  = 16,
-	[CIP_SFC_96000]  = 16,
-	[CIP_SFC_176400] = 32,
-	[CIP_SFC_192000] = 32,
-};
-EXPORT_SYMBOL(amdtp_syt_intervals);
-
-const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = {
-	[CIP_SFC_32000]  =  32000,
-	[CIP_SFC_44100]  =  44100,
-	[CIP_SFC_48000]  =  48000,
-	[CIP_SFC_88200]  =  88200,
-	[CIP_SFC_96000]  =  96000,
-	[CIP_SFC_176400] = 176400,
-	[CIP_SFC_192000] = 192000,
-};
-EXPORT_SYMBOL(amdtp_rate_table);
-
-/**
- * amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream
- * @s:		the AMDTP stream, which must be initialized.
- * @runtime:	the PCM substream runtime
- */
-int amdtp_stream_add_pcm_hw_constraints(struct amdtp_stream *s,
-					struct snd_pcm_runtime *runtime)
-{
-	int err;
-
-	/* AM824 in IEC 61883-6 can deliver 24bit data */
-	err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
-	if (err < 0)
-		goto end;
-
-	/*
-	 * Currently firewire-lib processes 16 packets in one software
-	 * interrupt callback. This equals to 2msec but actually the
-	 * interval of the interrupts has a jitter.
-	 * Additionally, even if adding a constraint to fit period size to
-	 * 2msec, actual calculated frames per period doesn't equal to 2msec,
-	 * depending on sampling rate.
-	 * Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec.
-	 * Here let us use 5msec for safe period interrupt.
-	 */
-	err = snd_pcm_hw_constraint_minmax(runtime,
-					   SNDRV_PCM_HW_PARAM_PERIOD_TIME,
-					   5000, UINT_MAX);
-	if (err < 0)
-		goto end;
-
-	/* Non-Blocking stream has no more constraints */
-	if (!(s->flags & CIP_BLOCKING))
-		goto end;
-
-	/*
-	 * One AMDTP packet can include some frames. In blocking mode, the
-	 * number equals to SYT_INTERVAL. So the number is 8, 16 or 32,
-	 * depending on its sampling rate. For accurate period interrupt, it's
-	 * preferrable to align period/buffer sizes to current SYT_INTERVAL.
-	 *
-	 * TODO: These constraints can be improved with proper rules.
-	 * Currently apply LCM of SYT_INTERVALs.
-	 */
-	err = snd_pcm_hw_constraint_step(runtime, 0,
-					 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32);
-	if (err < 0)
-		goto end;
-	err = snd_pcm_hw_constraint_step(runtime, 0,
-					 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32);
-end:
-	return err;
-}
-EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints);
-
-/**
- * amdtp_stream_set_parameters - set stream parameters
- * @s: the AMDTP stream to configure
- * @rate: the sample rate
- * @pcm_channels: the number of PCM samples in each data block, to be encoded
- *                as AM824 multi-bit linear audio
- * @midi_ports: the number of MIDI ports (i.e., MPX-MIDI Data Channels)
- *
- * The parameters must be set before the stream is started, and must not be
- * changed while the stream is running.
- */
-void amdtp_stream_set_parameters(struct amdtp_stream *s,
-				 unsigned int rate,
-				 unsigned int pcm_channels,
-				 unsigned int midi_ports)
-{
-	unsigned int i, sfc, midi_channels;
-
-	midi_channels = DIV_ROUND_UP(midi_ports, 8);
-
-	if (WARN_ON(amdtp_stream_running(s)) |
-	    WARN_ON(pcm_channels > AMDTP_MAX_CHANNELS_FOR_PCM) |
-	    WARN_ON(midi_channels > AMDTP_MAX_CHANNELS_FOR_MIDI))
-		return;
-
-	for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc)
-		if (amdtp_rate_table[sfc] == rate)
-			goto sfc_found;
-	WARN_ON(1);
-	return;
-
-sfc_found:
-	s->pcm_channels = pcm_channels;
-	s->sfc = sfc;
-	s->data_block_quadlets = s->pcm_channels + midi_channels;
-	s->midi_ports = midi_ports;
-
-	s->syt_interval = amdtp_syt_intervals[sfc];
-
-	/* default buffering in the device */
-	s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
-	if (s->flags & CIP_BLOCKING)
-		/* additional buffering needed to adjust for no-data packets */
-		s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate;
-
-	/* init the position map for PCM and MIDI channels */
-	for (i = 0; i < pcm_channels; i++)
-		s->pcm_positions[i] = i;
-	s->midi_position = s->pcm_channels;
-
-	/*
-	 * We do not know the actual MIDI FIFO size of most devices.  Just
-	 * assume two bytes, i.e., one byte can be received over the bus while
-	 * the previous one is transmitted over MIDI.
-	 * (The value here is adjusted for midi_ratelimit_per_packet().)
-	 */
-	s->midi_fifo_limit = rate - MIDI_BYTES_PER_SECOND * s->syt_interval + 1;
-}
-EXPORT_SYMBOL(amdtp_stream_set_parameters);
-
-/**
- * amdtp_stream_get_max_payload - get the stream's packet size
- * @s: the AMDTP stream
- *
- * This function must not be called before the stream has been configured
- * with amdtp_stream_set_parameters().
- */
-unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s)
-{
-	unsigned int multiplier = 1;
-
-	if (s->flags & CIP_JUMBO_PAYLOAD)
-		multiplier = 5;
-
-	return 8 + s->syt_interval * s->data_block_quadlets * 4 * multiplier;
-}
-EXPORT_SYMBOL(amdtp_stream_get_max_payload);
-
-static void write_pcm_s16(struct amdtp_stream *s,
-			  struct snd_pcm_substream *pcm,
-			  __be32 *buffer, unsigned int frames);
-static void write_pcm_s32(struct amdtp_stream *s,
-			  struct snd_pcm_substream *pcm,
-			  __be32 *buffer, unsigned int frames);
-static void read_pcm_s32(struct amdtp_stream *s,
-			 struct snd_pcm_substream *pcm,
-			 __be32 *buffer, unsigned int frames);
-
-/**
- * amdtp_stream_set_pcm_format - set the PCM format
- * @s: the AMDTP stream to configure
- * @format: the format of the ALSA PCM device
- *
- * The sample format must be set after the other parameters (rate/PCM channels/
- * MIDI) and before the stream is started, and must not be changed while the
- * stream is running.
- */
-void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
-				 snd_pcm_format_t format)
-{
-	if (WARN_ON(amdtp_stream_pcm_running(s)))
-		return;
-
-	switch (format) {
-	default:
-		WARN_ON(1);
-		/* fall through */
-	case SNDRV_PCM_FORMAT_S16:
-		if (s->direction == AMDTP_OUT_STREAM) {
-			s->transfer_samples = write_pcm_s16;
-			break;
-		}
-		WARN_ON(1);
-		/* fall through */
-	case SNDRV_PCM_FORMAT_S32:
-		if (s->direction == AMDTP_OUT_STREAM)
-			s->transfer_samples = write_pcm_s32;
-		else
-			s->transfer_samples = read_pcm_s32;
-		break;
-	}
-}
-EXPORT_SYMBOL(amdtp_stream_set_pcm_format);
-
-/**
- * amdtp_stream_pcm_prepare - prepare PCM device for running
- * @s: the AMDTP stream
- *
- * This function should be called from the PCM device's .prepare callback.
- */
-void amdtp_stream_pcm_prepare(struct amdtp_stream *s)
-{
-	tasklet_kill(&s->period_tasklet);
-	s->pcm_buffer_pointer = 0;
-	s->pcm_period_pointer = 0;
-	s->pointer_flush = true;
-}
-EXPORT_SYMBOL(amdtp_stream_pcm_prepare);
-
-static unsigned int calculate_data_blocks(struct amdtp_stream *s,
-					  unsigned int syt)
-{
-	unsigned int phase, data_blocks;
-
-	/* Blocking mode. */
-	if (s->flags & CIP_BLOCKING) {
-		/* This module generate empty packet for 'no data'. */
-		if (syt == CIP_SYT_NO_INFO)
-			data_blocks = 0;
-		else
-			data_blocks = s->syt_interval;
-	/* Non-blocking mode. */
-	} else {
-		if (!cip_sfc_is_base_44100(s->sfc)) {
-			/* Sample_rate / 8000 is an integer, and precomputed. */
-			data_blocks = s->data_block_state;
-		} else {
-			phase = s->data_block_state;
-
-		/*
-		 * This calculates the number of data blocks per packet so that
-		 * 1) the overall rate is correct and exactly synchronized to
-		 *    the bus clock, and
-		 * 2) packets with a rounded-up number of blocks occur as early
-		 *    as possible in the sequence (to prevent underruns of the
-		 *    device's buffer).
-		 */
-			if (s->sfc == CIP_SFC_44100)
-				/* 6 6 5 6 5 6 5 ... */
-				data_blocks = 5 + ((phase & 1) ^
-						   (phase == 0 || phase >= 40));
-			else
-				/* 12 11 11 11 11 ... or 23 22 22 22 22 ... */
-				data_blocks = 11 * (s->sfc >> 1) + (phase == 0);
-			if (++phase >= (80 >> (s->sfc >> 1)))
-				phase = 0;
-			s->data_block_state = phase;
-		}
-	}
-
-	return data_blocks;
-}
-
-static unsigned int calculate_syt(struct amdtp_stream *s,
-				  unsigned int cycle)
-{
-	unsigned int syt_offset, phase, index, syt;
-
-	if (s->last_syt_offset < TICKS_PER_CYCLE) {
-		if (!cip_sfc_is_base_44100(s->sfc))
-			syt_offset = s->last_syt_offset + s->syt_offset_state;
-		else {
-		/*
-		 * The time, in ticks, of the n'th SYT_INTERVAL sample is:
-		 *   n * SYT_INTERVAL * 24576000 / sample_rate
-		 * Modulo TICKS_PER_CYCLE, the difference between successive
-		 * elements is about 1386.23.  Rounding the results of this
-		 * formula to the SYT precision results in a sequence of
-		 * differences that begins with:
-		 *   1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ...
-		 * This code generates _exactly_ the same sequence.
-		 */
-			phase = s->syt_offset_state;
-			index = phase % 13;
-			syt_offset = s->last_syt_offset;
-			syt_offset += 1386 + ((index && !(index & 3)) ||
-					      phase == 146);
-			if (++phase >= 147)
-				phase = 0;
-			s->syt_offset_state = phase;
-		}
-	} else
-		syt_offset = s->last_syt_offset - TICKS_PER_CYCLE;
-	s->last_syt_offset = syt_offset;
-
-	if (syt_offset < TICKS_PER_CYCLE) {
-		syt_offset += s->transfer_delay;
-		syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12;
-		syt += syt_offset % TICKS_PER_CYCLE;
-
-		return syt & CIP_SYT_MASK;
-	} else {
-		return CIP_SYT_NO_INFO;
-	}
-}
-
-static void write_pcm_s32(struct amdtp_stream *s,
-			  struct snd_pcm_substream *pcm,
-			  __be32 *buffer, unsigned int frames)
-{
-	struct snd_pcm_runtime *runtime = pcm->runtime;
-	unsigned int channels, remaining_frames, i, c;
-	const u32 *src;
-
-	channels = s->pcm_channels;
-	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 < frames; ++i) {
-		for (c = 0; c < channels; ++c) {
-			buffer[s->pcm_positions[c]] =
-					cpu_to_be32((*src >> 8) | 0x40000000);
-			src++;
-		}
-		buffer += s->data_block_quadlets;
-		if (--remaining_frames == 0)
-			src = (void *)runtime->dma_area;
-	}
-}
-
-static void write_pcm_s16(struct amdtp_stream *s,
-			  struct snd_pcm_substream *pcm,
-			  __be32 *buffer, unsigned int frames)
-{
-	struct snd_pcm_runtime *runtime = pcm->runtime;
-	unsigned int channels, remaining_frames, i, c;
-	const u16 *src;
-
-	channels = s->pcm_channels;
-	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 < frames; ++i) {
-		for (c = 0; c < channels; ++c) {
-			buffer[s->pcm_positions[c]] =
-					cpu_to_be32((*src << 8) | 0x42000000);
-			src++;
-		}
-		buffer += s->data_block_quadlets;
-		if (--remaining_frames == 0)
-			src = (void *)runtime->dma_area;
-	}
-}
-
-static void read_pcm_s32(struct amdtp_stream *s,
-			 struct snd_pcm_substream *pcm,
-			 __be32 *buffer, unsigned int frames)
-{
-	struct snd_pcm_runtime *runtime = pcm->runtime;
-	unsigned int channels, remaining_frames, i, c;
-	u32 *dst;
-
-	channels = s->pcm_channels;
-	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 < frames; ++i) {
-		for (c = 0; c < channels; ++c) {
-			*dst = be32_to_cpu(buffer[s->pcm_positions[c]]) << 8;
-			dst++;
-		}
-		buffer += s->data_block_quadlets;
-		if (--remaining_frames == 0)
-			dst = (void *)runtime->dma_area;
-	}
-}
-
-static void write_pcm_silence(struct amdtp_stream *s,
-			      __be32 *buffer, unsigned int frames)
-{
-	unsigned int i, c;
-
-	for (i = 0; i < frames; ++i) {
-		for (c = 0; c < s->pcm_channels; ++c)
-			buffer[s->pcm_positions[c]] = cpu_to_be32(0x40000000);
-		buffer += s->data_block_quadlets;
-	}
-}
-
-/*
- * To avoid sending MIDI bytes at too high a rate, assume that the receiving
- * device has a FIFO, and track how much it is filled.  This values increases
- * by one whenever we send one byte in a packet, but the FIFO empties at
- * a constant rate independent of our packet rate.  One packet has syt_interval
- * samples, so the number of bytes that empty out of the FIFO, per packet(!),
- * is MIDI_BYTES_PER_SECOND * syt_interval / sample_rate.  To avoid storing
- * fractional values, the values in midi_fifo_used[] are measured in bytes
- * multiplied by the sample rate.
- */
-static bool midi_ratelimit_per_packet(struct amdtp_stream *s, unsigned int port)
-{
-	int used;
-
-	used = s->midi_fifo_used[port];
-	if (used == 0) /* common shortcut */
-		return true;
-
-	used -= MIDI_BYTES_PER_SECOND * s->syt_interval;
-	used = max(used, 0);
-	s->midi_fifo_used[port] = used;
-
-	return used < s->midi_fifo_limit;
-}
-
-static void midi_rate_use_one_byte(struct amdtp_stream *s, unsigned int port)
-{
-	s->midi_fifo_used[port] += amdtp_rate_table[s->sfc];
-}
-
-static void write_midi_messages(struct amdtp_stream *s,
-				__be32 *buffer, unsigned int frames)
-{
-	unsigned int f, port;
-	u8 *b;
-
-	for (f = 0; f < frames; f++) {
-		b = (u8 *)&buffer[s->midi_position];
-
-		port = (s->data_block_counter + f) % 8;
-		if (f < MAX_MIDI_RX_BLOCKS &&
-		    midi_ratelimit_per_packet(s, port) &&
-		    s->midi[port] != NULL &&
-		    snd_rawmidi_transmit(s->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;
-	}
-}
-
-static void read_midi_messages(struct amdtp_stream *s,
-			       __be32 *buffer, unsigned int frames)
-{
-	unsigned int f, port;
-	int len;
-	u8 *b;
-
-	for (f = 0; f < frames; f++) {
-		port = (s->data_block_counter + f) % 8;
-		b = (u8 *)&buffer[s->midi_position];
-
-		len = b[0] - 0x80;
-		if ((1 <= len) &&  (len <= 3) && (s->midi[port]))
-			snd_rawmidi_receive(s->midi[port], b + 1, len);
-
-		buffer += s->data_block_quadlets;
-	}
-}
-
-static void update_pcm_pointers(struct amdtp_stream *s,
-				struct snd_pcm_substream *pcm,
-				unsigned int frames)
-{
-	unsigned int ptr;
-
-	/*
-	 * In IEC 61883-6, one data block represents one event. In ALSA, one
-	 * event equals to one PCM frame. But Dice has a quirk to transfer
-	 * two PCM frames in one data block.
-	 */
-	if (s->double_pcm_frames)
-		frames *= 2;
-
-	ptr = s->pcm_buffer_pointer + frames;
-	if (ptr >= pcm->runtime->buffer_size)
-		ptr -= pcm->runtime->buffer_size;
-	ACCESS_ONCE(s->pcm_buffer_pointer) = ptr;
-
-	s->pcm_period_pointer += frames;
-	if (s->pcm_period_pointer >= pcm->runtime->period_size) {
-		s->pcm_period_pointer -= pcm->runtime->period_size;
-		s->pointer_flush = false;
-		tasklet_hi_schedule(&s->period_tasklet);
-	}
-}
-
-static void pcm_period_tasklet(unsigned long data)
-{
-	struct amdtp_stream *s = (void *)data;
-	struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
-
-	if (pcm)
-		snd_pcm_period_elapsed(pcm);
-}
-
-static int queue_packet(struct amdtp_stream *s,
-			unsigned int header_length,
-			unsigned int payload_length, bool skip)
-{
-	struct fw_iso_packet p = {0};
-	int err = 0;
-
-	if (IS_ERR(s->context))
-		goto end;
-
-	p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL);
-	p.tag = TAG_CIP;
-	p.header_length = header_length;
-	p.payload_length = (!skip) ? payload_length : 0;
-	p.skip = skip;
-	err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer,
-				   s->buffer.packets[s->packet_index].offset);
-	if (err < 0) {
-		dev_err(&s->unit->device, "queueing error: %d\n", err);
-		goto end;
-	}
-
-	if (++s->packet_index >= QUEUE_LENGTH)
-		s->packet_index = 0;
-end:
-	return err;
-}
-
-static inline int queue_out_packet(struct amdtp_stream *s,
-				   unsigned int payload_length, bool skip)
-{
-	return queue_packet(s, OUT_PACKET_HEADER_SIZE,
-			    payload_length, skip);
-}
-
-static inline int queue_in_packet(struct amdtp_stream *s)
-{
-	return queue_packet(s, IN_PACKET_HEADER_SIZE,
-			    amdtp_stream_get_max_payload(s), false);
-}
-
-static int handle_out_packet(struct amdtp_stream *s, unsigned int data_blocks,
-			     unsigned int syt)
-{
-	__be32 *buffer;
-	unsigned int payload_length;
-	struct snd_pcm_substream *pcm;
-
-	buffer = s->buffer.packets[s->packet_index].buffer;
-	buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) |
-				(s->data_block_quadlets << CIP_DBS_SHIFT) |
-				s->data_block_counter);
-	buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 |
-				(s->sfc << CIP_FDF_SHIFT) | syt);
-	buffer += 2;
-
-	pcm = ACCESS_ONCE(s->pcm);
-	if (pcm)
-		s->transfer_samples(s, pcm, buffer, data_blocks);
-	else
-		write_pcm_silence(s, buffer, data_blocks);
-	if (s->midi_ports)
-		write_midi_messages(s, buffer, data_blocks);
-
-	s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
-
-	payload_length = 8 + data_blocks * 4 * s->data_block_quadlets;
-	if (queue_out_packet(s, payload_length, false) < 0)
-		return -EIO;
-
-	if (pcm)
-		update_pcm_pointers(s, pcm, data_blocks);
-
-	/* No need to return the number of handled data blocks. */
-	return 0;
-}
-
-static int handle_in_packet(struct amdtp_stream *s,
-			    unsigned int payload_quadlets, __be32 *buffer,
-			    unsigned int *data_blocks)
-{
-	u32 cip_header[2];
-	unsigned int data_block_quadlets, data_block_counter, dbc_interval;
-	struct snd_pcm_substream *pcm = NULL;
-	bool lost;
-
-	cip_header[0] = be32_to_cpu(buffer[0]);
-	cip_header[1] = be32_to_cpu(buffer[1]);
-
-	/*
-	 * This module supports 'Two-quadlet CIP header with SYT field'.
-	 * For convenience, also check FMT field is AM824 or not.
-	 */
-	if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
-	    ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) ||
-	    ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) {
-		dev_info_ratelimited(&s->unit->device,
-				"Invalid CIP header for AMDTP: %08X:%08X\n",
-				cip_header[0], cip_header[1]);
-		*data_blocks = 0;
-		goto end;
-	}
-
-	/* Calculate data blocks */
-	if (payload_quadlets < 3 ||
-	    ((cip_header[1] & CIP_FDF_MASK) ==
-				(AMDTP_FDF_NO_DATA << CIP_FDF_SHIFT))) {
-		*data_blocks = 0;
-	} else {
-		data_block_quadlets =
-			(cip_header[0] & CIP_DBS_MASK) >> CIP_DBS_SHIFT;
-		/* avoid division by zero */
-		if (data_block_quadlets == 0) {
-			dev_err(&s->unit->device,
-				"Detect invalid value in dbs field: %08X\n",
-				cip_header[0]);
-			return -EPROTO;
-		}
-		if (s->flags & CIP_WRONG_DBS)
-			data_block_quadlets = s->data_block_quadlets;
-
-		*data_blocks = (payload_quadlets - 2) / data_block_quadlets;
-	}
-
-	/* Check data block counter continuity */
-	data_block_counter = cip_header[0] & CIP_DBC_MASK;
-	if (*data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) &&
-	    s->data_block_counter != UINT_MAX)
-		data_block_counter = s->data_block_counter;
-
-	if (((s->flags & CIP_SKIP_DBC_ZERO_CHECK) &&
-	     data_block_counter == s->tx_first_dbc) ||
-	    s->data_block_counter == UINT_MAX) {
-		lost = false;
-	} else if (!(s->flags & CIP_DBC_IS_END_EVENT)) {
-		lost = data_block_counter != s->data_block_counter;
-	} else {
-		if ((*data_blocks > 0) && (s->tx_dbc_interval > 0))
-			dbc_interval = s->tx_dbc_interval;
-		else
-			dbc_interval = *data_blocks;
-
-		lost = data_block_counter !=
-		       ((s->data_block_counter + dbc_interval) & 0xff);
-	}
-
-	if (lost) {
-		dev_err(&s->unit->device,
-			"Detect discontinuity of CIP: %02X %02X\n",
-			s->data_block_counter, data_block_counter);
-		return -EIO;
-	}
-
-	if (*data_blocks > 0) {
-		buffer += 2;
-
-		pcm = ACCESS_ONCE(s->pcm);
-		if (pcm)
-			s->transfer_samples(s, pcm, buffer, *data_blocks);
-
-		if (s->midi_ports)
-			read_midi_messages(s, buffer, *data_blocks);
-	}
-
-	if (s->flags & CIP_DBC_IS_END_EVENT)
-		s->data_block_counter = data_block_counter;
-	else
-		s->data_block_counter =
-				(data_block_counter + *data_blocks) & 0xff;
-end:
-	if (queue_in_packet(s) < 0)
-		return -EIO;
-
-	if (pcm)
-		update_pcm_pointers(s, pcm, *data_blocks);
-
-	return 0;
-}
-
-static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
-				size_t header_length, void *header,
-				void *private_data)
-{
-	struct amdtp_stream *s = private_data;
-	unsigned int i, syt, packets = header_length / 4;
-	unsigned int data_blocks;
-
-	if (s->packet_index < 0)
-		return;
-
-	/*
-	 * Compute the cycle of the last queued packet.
-	 * (We need only the four lowest bits for the SYT, so we can ignore
-	 * that bits 0-11 must wrap around at 3072.)
-	 */
-	cycle += QUEUE_LENGTH - packets;
-
-	for (i = 0; i < packets; ++i) {
-		syt = calculate_syt(s, ++cycle);
-		data_blocks = calculate_data_blocks(s, syt);
-
-		if (handle_out_packet(s, data_blocks, syt) < 0) {
-			s->packet_index = -1;
-			amdtp_stream_pcm_abort(s);
-			return;
-		}
-	}
-
-	fw_iso_context_queue_flush(s->context);
-}
-
-static void in_stream_callback(struct fw_iso_context *context, u32 cycle,
-			       size_t header_length, void *header,
-			       void *private_data)
-{
-	struct amdtp_stream *s = private_data;
-	unsigned int p, syt, packets;
-	unsigned int payload_quadlets, max_payload_quadlets;
-	unsigned int data_blocks;
-	__be32 *buffer, *headers = header;
-
-	if (s->packet_index < 0)
-		return;
-
-	/* The number of packets in buffer */
-	packets = header_length / IN_PACKET_HEADER_SIZE;
-
-	/* For buffer-over-run prevention. */
-	max_payload_quadlets = amdtp_stream_get_max_payload(s) / 4;
-
-	for (p = 0; p < packets; p++) {
-		buffer = s->buffer.packets[s->packet_index].buffer;
-
-		/* The number of quadlets in this packet */
-		payload_quadlets =
-			(be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4;
-		if (payload_quadlets > max_payload_quadlets) {
-			dev_err(&s->unit->device,
-				"Detect jumbo payload: %02x %02x\n",
-				payload_quadlets, max_payload_quadlets);
-			s->packet_index = -1;
-			break;
-		}
-
-		if (handle_in_packet(s, payload_quadlets, buffer,
-							&data_blocks) < 0) {
-			s->packet_index = -1;
-			break;
-		}
-
-		/* Process sync slave stream */
-		if (s->sync_slave && s->sync_slave->callbacked) {
-			syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK;
-			if (handle_out_packet(s->sync_slave,
-					      data_blocks, syt) < 0) {
-				s->packet_index = -1;
-				break;
-			}
-		}
-	}
-
-	/* Queueing error or detecting discontinuity */
-	if (s->packet_index < 0) {
-		amdtp_stream_pcm_abort(s);
-
-		/* Abort sync slave. */
-		if (s->sync_slave) {
-			s->sync_slave->packet_index = -1;
-			amdtp_stream_pcm_abort(s->sync_slave);
-		}
-		return;
-	}
-
-	/* when sync to device, flush the packets for slave stream */
-	if (s->sync_slave && s->sync_slave->callbacked)
-		fw_iso_context_queue_flush(s->sync_slave->context);
-
-	fw_iso_context_queue_flush(s->context);
-}
-
-/* processing is done by master callback */
-static void slave_stream_callback(struct fw_iso_context *context, u32 cycle,
-				  size_t header_length, void *header,
-				  void *private_data)
-{
-	return;
-}
-
-/* this is executed one time */
-static void amdtp_stream_first_callback(struct fw_iso_context *context,
-					u32 cycle, size_t header_length,
-					void *header, void *private_data)
-{
-	struct amdtp_stream *s = private_data;
-
-	/*
-	 * For in-stream, first packet has come.
-	 * For out-stream, prepared to transmit first packet
-	 */
-	s->callbacked = true;
-	wake_up(&s->callback_wait);
-
-	if (s->direction == AMDTP_IN_STREAM)
-		context->callback.sc = in_stream_callback;
-	else if (s->flags & CIP_SYNC_TO_DEVICE)
-		context->callback.sc = slave_stream_callback;
-	else
-		context->callback.sc = out_stream_callback;
-
-	context->callback.sc(context, cycle, header_length, header, s);
-}
-
-/**
- * amdtp_stream_start - start transferring packets
- * @s: the AMDTP stream to start
- * @channel: the isochronous channel on the bus
- * @speed: firewire speed code
- *
- * The stream cannot be started until it has been configured with
- * amdtp_stream_set_parameters() and it must be started before any PCM or MIDI
- * device can be started.
- */
-int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
-{
-	static const struct {
-		unsigned int data_block;
-		unsigned int syt_offset;
-	} initial_state[] = {
-		[CIP_SFC_32000]  = {  4, 3072 },
-		[CIP_SFC_48000]  = {  6, 1024 },
-		[CIP_SFC_96000]  = { 12, 1024 },
-		[CIP_SFC_192000] = { 24, 1024 },
-		[CIP_SFC_44100]  = {  0,   67 },
-		[CIP_SFC_88200]  = {  0,   67 },
-		[CIP_SFC_176400] = {  0,   67 },
-	};
-	unsigned int header_size;
-	enum dma_data_direction dir;
-	int type, tag, err;
-
-	mutex_lock(&s->mutex);
-
-	if (WARN_ON(amdtp_stream_running(s) ||
-		    (s->data_block_quadlets < 1))) {
-		err = -EBADFD;
-		goto err_unlock;
-	}
-
-	if (s->direction == AMDTP_IN_STREAM &&
-	    s->flags & CIP_SKIP_INIT_DBC_CHECK)
-		s->data_block_counter = UINT_MAX;
-	else
-		s->data_block_counter = 0;
-	s->data_block_state = initial_state[s->sfc].data_block;
-	s->syt_offset_state = initial_state[s->sfc].syt_offset;
-	s->last_syt_offset = TICKS_PER_CYCLE;
-
-	/* initialize packet buffer */
-	if (s->direction == AMDTP_IN_STREAM) {
-		dir = DMA_FROM_DEVICE;
-		type = FW_ISO_CONTEXT_RECEIVE;
-		header_size = IN_PACKET_HEADER_SIZE;
-	} else {
-		dir = DMA_TO_DEVICE;
-		type = FW_ISO_CONTEXT_TRANSMIT;
-		header_size = OUT_PACKET_HEADER_SIZE;
-	}
-	err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH,
-				      amdtp_stream_get_max_payload(s), dir);
-	if (err < 0)
-		goto err_unlock;
-
-	s->context = fw_iso_context_create(fw_parent_device(s->unit)->card,
-					   type, channel, speed, header_size,
-					   amdtp_stream_first_callback, s);
-	if (IS_ERR(s->context)) {
-		err = PTR_ERR(s->context);
-		if (err == -EBUSY)
-			dev_err(&s->unit->device,
-				"no free stream on this controller\n");
-		goto err_buffer;
-	}
-
-	amdtp_stream_update(s);
-
-	s->packet_index = 0;
-	do {
-		if (s->direction == AMDTP_IN_STREAM)
-			err = queue_in_packet(s);
-		else
-			err = queue_out_packet(s, 0, true);
-		if (err < 0)
-			goto err_context;
-	} while (s->packet_index > 0);
-
-	/* NOTE: TAG1 matches CIP. This just affects in stream. */
-	tag = FW_ISO_CONTEXT_MATCH_TAG1;
-	if (s->flags & CIP_EMPTY_WITH_TAG0)
-		tag |= FW_ISO_CONTEXT_MATCH_TAG0;
-
-	s->callbacked = false;
-	err = fw_iso_context_start(s->context, -1, 0, tag);
-	if (err < 0)
-		goto err_context;
-
-	mutex_unlock(&s->mutex);
-
-	return 0;
-
-err_context:
-	fw_iso_context_destroy(s->context);
-	s->context = ERR_PTR(-1);
-err_buffer:
-	iso_packets_buffer_destroy(&s->buffer, s->unit);
-err_unlock:
-	mutex_unlock(&s->mutex);
-
-	return err;
-}
-EXPORT_SYMBOL(amdtp_stream_start);
-
-/**
- * amdtp_stream_pcm_pointer - get the PCM buffer position
- * @s: the AMDTP stream that transports the PCM data
- *
- * Returns the current buffer position, in frames.
- */
-unsigned long amdtp_stream_pcm_pointer(struct amdtp_stream *s)
-{
-	/* this optimization is allowed to be racy */
-	if (s->pointer_flush && amdtp_stream_running(s))
-		fw_iso_context_flush_completions(s->context);
-	else
-		s->pointer_flush = true;
-
-	return ACCESS_ONCE(s->pcm_buffer_pointer);
-}
-EXPORT_SYMBOL(amdtp_stream_pcm_pointer);
-
-/**
- * amdtp_stream_update - update the stream after a bus reset
- * @s: the AMDTP stream
- */
-void amdtp_stream_update(struct amdtp_stream *s)
-{
-	/* Precomputing. */
-	ACCESS_ONCE(s->source_node_id_field) =
-		(fw_parent_device(s->unit)->card->node_id << CIP_SID_SHIFT) &
-								CIP_SID_MASK;
-}
-EXPORT_SYMBOL(amdtp_stream_update);
-
-/**
- * amdtp_stream_stop - stop sending packets
- * @s: the AMDTP stream to stop
- *
- * All PCM and MIDI devices of the stream must be stopped before the stream
- * itself can be stopped.
- */
-void amdtp_stream_stop(struct amdtp_stream *s)
-{
-	mutex_lock(&s->mutex);
-
-	if (!amdtp_stream_running(s)) {
-		mutex_unlock(&s->mutex);
-		return;
-	}
-
-	tasklet_kill(&s->period_tasklet);
-	fw_iso_context_stop(s->context);
-	fw_iso_context_destroy(s->context);
-	s->context = ERR_PTR(-1);
-	iso_packets_buffer_destroy(&s->buffer, s->unit);
-
-	s->callbacked = false;
-
-	mutex_unlock(&s->mutex);
-}
-EXPORT_SYMBOL(amdtp_stream_stop);
-
-/**
- * amdtp_stream_pcm_abort - abort the running PCM device
- * @s: the AMDTP stream about to be stopped
- *
- * If the isochronous stream needs to be stopped asynchronously, call this
- * function first to stop the PCM device.
- */
-void amdtp_stream_pcm_abort(struct amdtp_stream *s)
-{
-	struct snd_pcm_substream *pcm;
-
-	pcm = ACCESS_ONCE(s->pcm);
-	if (pcm)
-		snd_pcm_stop_xrun(pcm);
-}
-EXPORT_SYMBOL(amdtp_stream_pcm_abort);