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![Takashi Sakamoto](/assets/img/avatar_default.png)
During packet streaming, maximum length of payload for isochronous packet is invariable, therefore no need to recalculate. Current ALSA IEC 61883-1/6 engine calls a function to calculate it 8,000 or more times per second for incoming packet processing. This commit adds a member to have maximum length of payload into 'struct amdtp_stream', to reduces the function calls. At first callback from isochronous context, the length is calculated and stored for later processing. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
987 lines
27 KiB
C
987 lines
27 KiB
C
/*
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* Audio and Music Data Transmission Protocol (IEC 61883-6) streams
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* with Common Isochronous Packet (IEC 61883-1) headers
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*
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* Copyright (c) Clemens Ladisch <clemens@ladisch.de>
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/firewire.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include "amdtp-stream.h"
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#define TICKS_PER_CYCLE 3072
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#define CYCLES_PER_SECOND 8000
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#define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND)
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/* Always support Linux tracing subsystem. */
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#define CREATE_TRACE_POINTS
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#include "amdtp-stream-trace.h"
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#define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 microseconds */
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/* isochronous header parameters */
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#define ISO_DATA_LENGTH_SHIFT 16
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#define TAG_NO_CIP_HEADER 0
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#define TAG_CIP 1
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/* common isochronous packet header parameters */
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#define CIP_EOH_SHIFT 31
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#define CIP_EOH (1u << CIP_EOH_SHIFT)
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#define CIP_EOH_MASK 0x80000000
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#define CIP_SID_SHIFT 24
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#define CIP_SID_MASK 0x3f000000
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#define CIP_DBS_MASK 0x00ff0000
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#define CIP_DBS_SHIFT 16
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#define CIP_SPH_MASK 0x00000400
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#define CIP_SPH_SHIFT 10
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#define CIP_DBC_MASK 0x000000ff
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#define CIP_FMT_SHIFT 24
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#define CIP_FMT_MASK 0x3f000000
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#define CIP_FDF_MASK 0x00ff0000
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#define CIP_FDF_SHIFT 16
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#define CIP_SYT_MASK 0x0000ffff
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#define CIP_SYT_NO_INFO 0xffff
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/* Audio and Music transfer protocol specific parameters */
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#define CIP_FMT_AM 0x10
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#define AMDTP_FDF_NO_DATA 0xff
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/* TODO: make these configurable */
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#define INTERRUPT_INTERVAL 16
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#define QUEUE_LENGTH 48
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#define IN_PACKET_HEADER_SIZE 4
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#define OUT_PACKET_HEADER_SIZE 0
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static void pcm_period_tasklet(unsigned long data);
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/**
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* amdtp_stream_init - initialize an AMDTP stream structure
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* @s: the AMDTP stream to initialize
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* @unit: the target of the stream
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* @dir: the direction of stream
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* @flags: the packet transmission method to use
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* @fmt: the value of fmt field in CIP header
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* @process_data_blocks: callback handler to process data blocks
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* @protocol_size: the size to allocate newly for protocol
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*/
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int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir, enum cip_flags flags,
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unsigned int fmt,
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amdtp_stream_process_data_blocks_t process_data_blocks,
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unsigned int protocol_size)
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{
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if (process_data_blocks == NULL)
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return -EINVAL;
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s->protocol = kzalloc(protocol_size, GFP_KERNEL);
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if (!s->protocol)
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return -ENOMEM;
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s->unit = unit;
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s->direction = dir;
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s->flags = flags;
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s->context = ERR_PTR(-1);
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mutex_init(&s->mutex);
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tasklet_init(&s->period_tasklet, pcm_period_tasklet, (unsigned long)s);
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s->packet_index = 0;
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init_waitqueue_head(&s->callback_wait);
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s->callbacked = false;
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s->fmt = fmt;
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s->process_data_blocks = process_data_blocks;
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return 0;
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}
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EXPORT_SYMBOL(amdtp_stream_init);
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/**
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* amdtp_stream_destroy - free stream resources
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* @s: the AMDTP stream to destroy
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*/
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void amdtp_stream_destroy(struct amdtp_stream *s)
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{
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/* Not initialized. */
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if (s->protocol == NULL)
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return;
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WARN_ON(amdtp_stream_running(s));
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kfree(s->protocol);
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mutex_destroy(&s->mutex);
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}
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EXPORT_SYMBOL(amdtp_stream_destroy);
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const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT] = {
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[CIP_SFC_32000] = 8,
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[CIP_SFC_44100] = 8,
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[CIP_SFC_48000] = 8,
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[CIP_SFC_88200] = 16,
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[CIP_SFC_96000] = 16,
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[CIP_SFC_176400] = 32,
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[CIP_SFC_192000] = 32,
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};
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EXPORT_SYMBOL(amdtp_syt_intervals);
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const unsigned int amdtp_rate_table[CIP_SFC_COUNT] = {
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[CIP_SFC_32000] = 32000,
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[CIP_SFC_44100] = 44100,
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[CIP_SFC_48000] = 48000,
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[CIP_SFC_88200] = 88200,
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[CIP_SFC_96000] = 96000,
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[CIP_SFC_176400] = 176400,
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[CIP_SFC_192000] = 192000,
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};
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EXPORT_SYMBOL(amdtp_rate_table);
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/**
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* amdtp_stream_add_pcm_hw_constraints - add hw constraints for PCM substream
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* @s: the AMDTP stream, which must be initialized.
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* @runtime: the PCM substream runtime
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*/
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int amdtp_stream_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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/*
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* Currently firewire-lib processes 16 packets in one software
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* interrupt callback. This equals to 2msec but actually the
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* interval of the interrupts has a jitter.
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* Additionally, even if adding a constraint to fit period size to
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* 2msec, actual calculated frames per period doesn't equal to 2msec,
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* depending on sampling rate.
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* Anyway, the interval to call snd_pcm_period_elapsed() cannot 2msec.
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* Here let us use 5msec for safe period interrupt.
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*/
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err = snd_pcm_hw_constraint_minmax(runtime,
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SNDRV_PCM_HW_PARAM_PERIOD_TIME,
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5000, UINT_MAX);
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if (err < 0)
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goto end;
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/* Non-Blocking stream has no more constraints */
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if (!(s->flags & CIP_BLOCKING))
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goto end;
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/*
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* One AMDTP packet can include some frames. In blocking mode, the
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* number equals to SYT_INTERVAL. So the number is 8, 16 or 32,
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* depending on its sampling rate. For accurate period interrupt, it's
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* preferrable to align period/buffer sizes to current SYT_INTERVAL.
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*
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* TODO: These constraints can be improved with proper rules.
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* Currently apply LCM of SYT_INTERVALs.
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*/
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err = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 32);
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if (err < 0)
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goto end;
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err = snd_pcm_hw_constraint_step(runtime, 0,
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SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 32);
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end:
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return err;
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}
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EXPORT_SYMBOL(amdtp_stream_add_pcm_hw_constraints);
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/**
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* amdtp_stream_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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* @data_block_quadlets: the size of a data block in quadlet unit
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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_stream_set_parameters(struct amdtp_stream *s, unsigned int rate,
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unsigned int data_block_quadlets)
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{
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unsigned int sfc;
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for (sfc = 0; sfc < ARRAY_SIZE(amdtp_rate_table); ++sfc) {
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if (amdtp_rate_table[sfc] == rate)
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break;
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}
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if (sfc == ARRAY_SIZE(amdtp_rate_table))
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return -EINVAL;
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s->sfc = sfc;
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s->data_block_quadlets = data_block_quadlets;
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s->syt_interval = amdtp_syt_intervals[sfc];
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/* default buffering in the device */
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s->transfer_delay = TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE;
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if (s->flags & CIP_BLOCKING)
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/* additional buffering needed to adjust for no-data packets */
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s->transfer_delay += TICKS_PER_SECOND * s->syt_interval / rate;
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return 0;
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}
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EXPORT_SYMBOL(amdtp_stream_set_parameters);
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/**
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* amdtp_stream_get_max_payload - get the stream's packet size
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* @s: the AMDTP stream
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*
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* This function must not be called before the stream has been configured
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* with amdtp_stream_set_parameters().
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*/
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unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s)
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{
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unsigned int multiplier = 1;
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unsigned int header_size = 0;
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if (s->flags & CIP_JUMBO_PAYLOAD)
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multiplier = 5;
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if (!(s->flags & CIP_NO_HEADER))
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header_size = 8;
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return header_size +
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s->syt_interval * s->data_block_quadlets * 4 * multiplier;
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}
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EXPORT_SYMBOL(amdtp_stream_get_max_payload);
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/**
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* amdtp_stream_pcm_prepare - prepare PCM device for running
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* @s: the AMDTP stream
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*
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* This function should be called from the PCM device's .prepare callback.
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*/
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void amdtp_stream_pcm_prepare(struct amdtp_stream *s)
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{
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tasklet_kill(&s->period_tasklet);
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s->pcm_buffer_pointer = 0;
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s->pcm_period_pointer = 0;
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}
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EXPORT_SYMBOL(amdtp_stream_pcm_prepare);
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static unsigned int calculate_data_blocks(struct amdtp_stream *s,
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unsigned int syt)
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{
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unsigned int phase, data_blocks;
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/* Blocking mode. */
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if (s->flags & CIP_BLOCKING) {
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/* This module generate empty packet for 'no data'. */
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if (syt == CIP_SYT_NO_INFO)
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data_blocks = 0;
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else
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data_blocks = s->syt_interval;
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/* Non-blocking mode. */
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} else {
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if (!cip_sfc_is_base_44100(s->sfc)) {
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/* Sample_rate / 8000 is an integer, and precomputed. */
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data_blocks = s->data_block_state;
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} else {
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phase = s->data_block_state;
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/*
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* This calculates the number of data blocks per packet so that
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* 1) the overall rate is correct and exactly synchronized to
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* the bus clock, and
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* 2) packets with a rounded-up number of blocks occur as early
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* as possible in the sequence (to prevent underruns of the
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* device's buffer).
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*/
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if (s->sfc == CIP_SFC_44100)
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/* 6 6 5 6 5 6 5 ... */
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data_blocks = 5 + ((phase & 1) ^
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(phase == 0 || phase >= 40));
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else
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/* 12 11 11 11 11 ... or 23 22 22 22 22 ... */
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data_blocks = 11 * (s->sfc >> 1) + (phase == 0);
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if (++phase >= (80 >> (s->sfc >> 1)))
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phase = 0;
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s->data_block_state = phase;
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}
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}
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return data_blocks;
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}
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static unsigned int calculate_syt(struct amdtp_stream *s,
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unsigned int cycle)
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{
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unsigned int syt_offset, phase, index, syt;
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if (s->last_syt_offset < TICKS_PER_CYCLE) {
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if (!cip_sfc_is_base_44100(s->sfc))
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syt_offset = s->last_syt_offset + s->syt_offset_state;
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else {
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/*
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* The time, in ticks, of the n'th SYT_INTERVAL sample is:
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* n * SYT_INTERVAL * 24576000 / sample_rate
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* Modulo TICKS_PER_CYCLE, the difference between successive
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* elements is about 1386.23. Rounding the results of this
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* formula to the SYT precision results in a sequence of
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* differences that begins with:
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* 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ...
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* This code generates _exactly_ the same sequence.
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*/
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phase = s->syt_offset_state;
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index = phase % 13;
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syt_offset = s->last_syt_offset;
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syt_offset += 1386 + ((index && !(index & 3)) ||
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phase == 146);
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if (++phase >= 147)
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phase = 0;
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s->syt_offset_state = phase;
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}
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} else
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syt_offset = s->last_syt_offset - TICKS_PER_CYCLE;
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s->last_syt_offset = syt_offset;
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if (syt_offset < TICKS_PER_CYCLE) {
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syt_offset += s->transfer_delay;
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syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12;
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syt += syt_offset % TICKS_PER_CYCLE;
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return syt & CIP_SYT_MASK;
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} else {
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return CIP_SYT_NO_INFO;
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}
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}
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static void update_pcm_pointers(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm,
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unsigned int frames)
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{
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unsigned int ptr;
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ptr = s->pcm_buffer_pointer + frames;
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if (ptr >= pcm->runtime->buffer_size)
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ptr -= pcm->runtime->buffer_size;
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ACCESS_ONCE(s->pcm_buffer_pointer) = ptr;
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s->pcm_period_pointer += frames;
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if (s->pcm_period_pointer >= pcm->runtime->period_size) {
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s->pcm_period_pointer -= pcm->runtime->period_size;
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tasklet_hi_schedule(&s->period_tasklet);
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}
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}
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static void pcm_period_tasklet(unsigned long data)
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{
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struct amdtp_stream *s = (void *)data;
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struct snd_pcm_substream *pcm = ACCESS_ONCE(s->pcm);
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if (pcm)
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snd_pcm_period_elapsed(pcm);
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}
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static int queue_packet(struct amdtp_stream *s, unsigned int header_length,
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unsigned int payload_length)
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{
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struct fw_iso_packet p = {0};
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int err = 0;
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if (IS_ERR(s->context))
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goto end;
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p.interrupt = IS_ALIGNED(s->packet_index + 1, INTERRUPT_INTERVAL);
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p.tag = s->tag;
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p.header_length = header_length;
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if (payload_length > 0)
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p.payload_length = payload_length;
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else
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p.skip = true;
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err = fw_iso_context_queue(s->context, &p, &s->buffer.iso_buffer,
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s->buffer.packets[s->packet_index].offset);
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if (err < 0) {
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dev_err(&s->unit->device, "queueing error: %d\n", err);
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goto end;
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}
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if (++s->packet_index >= QUEUE_LENGTH)
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s->packet_index = 0;
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end:
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return err;
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}
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static inline int queue_out_packet(struct amdtp_stream *s,
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unsigned int payload_length)
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{
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return queue_packet(s, OUT_PACKET_HEADER_SIZE, payload_length);
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}
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static inline int queue_in_packet(struct amdtp_stream *s)
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{
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return queue_packet(s, IN_PACKET_HEADER_SIZE, s->max_payload_length);
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}
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static int handle_out_packet(struct amdtp_stream *s,
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unsigned int payload_length, unsigned int cycle,
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unsigned int index)
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{
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__be32 *buffer;
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unsigned int syt;
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unsigned int data_blocks;
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unsigned int pcm_frames;
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struct snd_pcm_substream *pcm;
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buffer = s->buffer.packets[s->packet_index].buffer;
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syt = calculate_syt(s, cycle);
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data_blocks = calculate_data_blocks(s, syt);
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pcm_frames = s->process_data_blocks(s, buffer + 2, data_blocks, &syt);
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if (s->flags & CIP_DBC_IS_END_EVENT)
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s->data_block_counter =
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(s->data_block_counter + data_blocks) & 0xff;
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buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) |
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(s->data_block_quadlets << CIP_DBS_SHIFT) |
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((s->sph << CIP_SPH_SHIFT) & CIP_SPH_MASK) |
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s->data_block_counter);
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buffer[1] = cpu_to_be32(CIP_EOH |
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((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) |
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((s->fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) |
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(syt & CIP_SYT_MASK));
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if (!(s->flags & CIP_DBC_IS_END_EVENT))
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s->data_block_counter =
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(s->data_block_counter + data_blocks) & 0xff;
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payload_length = 8 + data_blocks * 4 * s->data_block_quadlets;
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trace_out_packet(s, cycle, buffer, payload_length, index);
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if (queue_out_packet(s, payload_length) < 0)
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return -EIO;
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pcm = ACCESS_ONCE(s->pcm);
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if (pcm && pcm_frames > 0)
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update_pcm_pointers(s, pcm, pcm_frames);
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/* No need to return the number of handled data blocks. */
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return 0;
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}
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static int handle_out_packet_without_header(struct amdtp_stream *s,
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unsigned int payload_length, unsigned int cycle,
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unsigned int index)
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{
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__be32 *buffer;
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unsigned int syt;
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unsigned int data_blocks;
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unsigned int pcm_frames;
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struct snd_pcm_substream *pcm;
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buffer = s->buffer.packets[s->packet_index].buffer;
|
|
syt = calculate_syt(s, cycle);
|
|
data_blocks = calculate_data_blocks(s, syt);
|
|
pcm_frames = s->process_data_blocks(s, buffer, data_blocks, &syt);
|
|
s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
|
|
|
|
payload_length = data_blocks * 4 * s->data_block_quadlets;
|
|
|
|
trace_out_packet_without_header(s, cycle, payload_length, data_blocks,
|
|
index);
|
|
|
|
if (queue_out_packet(s, payload_length) < 0)
|
|
return -EIO;
|
|
|
|
pcm = ACCESS_ONCE(s->pcm);
|
|
if (pcm && pcm_frames > 0)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
|
|
/* No need to return the number of handled data blocks. */
|
|
return 0;
|
|
}
|
|
|
|
static int handle_in_packet(struct amdtp_stream *s,
|
|
unsigned int payload_length, unsigned int cycle,
|
|
unsigned int index)
|
|
{
|
|
__be32 *buffer;
|
|
u32 cip_header[2];
|
|
unsigned int sph, fmt, fdf, syt;
|
|
unsigned int data_block_quadlets, data_block_counter, dbc_interval;
|
|
unsigned int data_blocks;
|
|
struct snd_pcm_substream *pcm;
|
|
unsigned int pcm_frames;
|
|
bool lost;
|
|
|
|
buffer = s->buffer.packets[s->packet_index].buffer;
|
|
cip_header[0] = be32_to_cpu(buffer[0]);
|
|
cip_header[1] = be32_to_cpu(buffer[1]);
|
|
|
|
trace_in_packet(s, cycle, cip_header, payload_length, index);
|
|
|
|
/*
|
|
* 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)) &&
|
|
(!(s->flags & CIP_HEADER_WITHOUT_EOH))) {
|
|
dev_info_ratelimited(&s->unit->device,
|
|
"Invalid CIP header for AMDTP: %08X:%08X\n",
|
|
cip_header[0], cip_header[1]);
|
|
data_blocks = 0;
|
|
pcm_frames = 0;
|
|
goto end;
|
|
}
|
|
|
|
/* Check valid protocol or not. */
|
|
sph = (cip_header[0] & CIP_SPH_MASK) >> CIP_SPH_SHIFT;
|
|
fmt = (cip_header[1] & CIP_FMT_MASK) >> CIP_FMT_SHIFT;
|
|
if (sph != s->sph || fmt != s->fmt) {
|
|
dev_info_ratelimited(&s->unit->device,
|
|
"Detect unexpected protocol: %08x %08x\n",
|
|
cip_header[0], cip_header[1]);
|
|
data_blocks = 0;
|
|
pcm_frames = 0;
|
|
goto end;
|
|
}
|
|
|
|
/* Calculate data blocks */
|
|
fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT;
|
|
if (payload_length < 12 ||
|
|
(fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) {
|
|
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_length / 4 - 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;
|
|
}
|
|
|
|
syt = be32_to_cpu(buffer[1]) & CIP_SYT_MASK;
|
|
pcm_frames = s->process_data_blocks(s, buffer + 2, data_blocks, &syt);
|
|
|
|
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;
|
|
|
|
pcm = ACCESS_ONCE(s->pcm);
|
|
if (pcm && pcm_frames > 0)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int handle_in_packet_without_header(struct amdtp_stream *s,
|
|
unsigned int payload_quadlets, unsigned int cycle,
|
|
unsigned int index)
|
|
{
|
|
__be32 *buffer;
|
|
unsigned int data_blocks;
|
|
struct snd_pcm_substream *pcm;
|
|
unsigned int pcm_frames;
|
|
|
|
buffer = s->buffer.packets[s->packet_index].buffer;
|
|
data_blocks = payload_quadlets / s->data_block_quadlets;
|
|
|
|
trace_in_packet_without_header(s, cycle, payload_quadlets, data_blocks,
|
|
index);
|
|
|
|
pcm_frames = s->process_data_blocks(s, buffer, data_blocks, NULL);
|
|
s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
|
|
|
|
if (queue_in_packet(s) < 0)
|
|
return -EIO;
|
|
|
|
pcm = ACCESS_ONCE(s->pcm);
|
|
if (pcm && pcm_frames > 0)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* In CYCLE_TIMER register of IEEE 1394, 7 bits are used to represent second. On
|
|
* the other hand, in DMA descriptors of 1394 OHCI, 3 bits are used to represent
|
|
* it. Thus, via Linux firewire subsystem, we can get the 3 bits for second.
|
|
*/
|
|
static inline u32 compute_cycle_count(u32 tstamp)
|
|
{
|
|
return (((tstamp >> 13) & 0x07) * 8000) + (tstamp & 0x1fff);
|
|
}
|
|
|
|
static inline u32 increment_cycle_count(u32 cycle, unsigned int addend)
|
|
{
|
|
cycle += addend;
|
|
if (cycle >= 8 * CYCLES_PER_SECOND)
|
|
cycle -= 8 * CYCLES_PER_SECOND;
|
|
return cycle;
|
|
}
|
|
|
|
static inline u32 decrement_cycle_count(u32 cycle, unsigned int subtrahend)
|
|
{
|
|
if (cycle < subtrahend)
|
|
cycle += 8 * CYCLES_PER_SECOND;
|
|
return cycle - subtrahend;
|
|
}
|
|
|
|
static void out_stream_callback(struct fw_iso_context *context, u32 tstamp,
|
|
size_t header_length, void *header,
|
|
void *private_data)
|
|
{
|
|
struct amdtp_stream *s = private_data;
|
|
unsigned int i, packets = header_length / 4;
|
|
u32 cycle;
|
|
|
|
if (s->packet_index < 0)
|
|
return;
|
|
|
|
cycle = compute_cycle_count(tstamp);
|
|
|
|
/* Align to actual cycle count for the last packet. */
|
|
cycle = increment_cycle_count(cycle, QUEUE_LENGTH - packets);
|
|
|
|
for (i = 0; i < packets; ++i) {
|
|
cycle = increment_cycle_count(cycle, 1);
|
|
if (s->handle_packet(s, 0, cycle, i) < 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 tstamp,
|
|
size_t header_length, void *header,
|
|
void *private_data)
|
|
{
|
|
struct amdtp_stream *s = private_data;
|
|
unsigned int i, packets;
|
|
unsigned int payload_length, max_payload_length;
|
|
__be32 *headers = header;
|
|
u32 cycle;
|
|
|
|
if (s->packet_index < 0)
|
|
return;
|
|
|
|
/* The number of packets in buffer */
|
|
packets = header_length / IN_PACKET_HEADER_SIZE;
|
|
|
|
cycle = compute_cycle_count(tstamp);
|
|
|
|
/* Align to actual cycle count for the last packet. */
|
|
cycle = decrement_cycle_count(cycle, packets);
|
|
|
|
/* For buffer-over-run prevention. */
|
|
max_payload_length = s->max_payload_length;
|
|
|
|
for (i = 0; i < packets; i++) {
|
|
cycle = increment_cycle_count(cycle, 1);
|
|
|
|
/* The number of bytes in this packet */
|
|
payload_length =
|
|
(be32_to_cpu(headers[i]) >> ISO_DATA_LENGTH_SHIFT);
|
|
if (payload_length > max_payload_length) {
|
|
dev_err(&s->unit->device,
|
|
"Detect jumbo payload: %04x %04x\n",
|
|
payload_length, max_payload_length);
|
|
break;
|
|
}
|
|
|
|
if (s->handle_packet(s, payload_length, cycle, i) < 0)
|
|
break;
|
|
}
|
|
|
|
/* Queueing error or detecting invalid payload. */
|
|
if (i < packets) {
|
|
s->packet_index = -1;
|
|
amdtp_stream_pcm_abort(s);
|
|
return;
|
|
}
|
|
|
|
fw_iso_context_queue_flush(s->context);
|
|
}
|
|
|
|
/* this is executed one time */
|
|
static void amdtp_stream_first_callback(struct fw_iso_context *context,
|
|
u32 tstamp, size_t header_length,
|
|
void *header, void *private_data)
|
|
{
|
|
struct amdtp_stream *s = private_data;
|
|
u32 cycle;
|
|
unsigned int packets;
|
|
|
|
s->max_payload_length = amdtp_stream_get_max_payload(s);
|
|
|
|
/*
|
|
* For in-stream, first packet has come.
|
|
* For out-stream, prepared to transmit first packet
|
|
*/
|
|
s->callbacked = true;
|
|
wake_up(&s->callback_wait);
|
|
|
|
cycle = compute_cycle_count(tstamp);
|
|
|
|
if (s->direction == AMDTP_IN_STREAM) {
|
|
packets = header_length / IN_PACKET_HEADER_SIZE;
|
|
cycle = decrement_cycle_count(cycle, packets);
|
|
context->callback.sc = in_stream_callback;
|
|
if (s->flags & CIP_NO_HEADER)
|
|
s->handle_packet = handle_in_packet_without_header;
|
|
else
|
|
s->handle_packet = handle_in_packet;
|
|
} else {
|
|
packets = header_length / 4;
|
|
cycle = increment_cycle_count(cycle, QUEUE_LENGTH - packets);
|
|
context->callback.sc = out_stream_callback;
|
|
if (s->flags & CIP_NO_HEADER)
|
|
s->handle_packet = handle_out_packet_without_header;
|
|
else
|
|
s->handle_packet = handle_out_packet;
|
|
}
|
|
|
|
s->start_cycle = cycle;
|
|
|
|
context->callback.sc(context, tstamp, 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->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);
|
|
|
|
if (s->flags & CIP_NO_HEADER)
|
|
s->tag = TAG_NO_CIP_HEADER;
|
|
else
|
|
s->tag = TAG_CIP;
|
|
|
|
s->packet_index = 0;
|
|
do {
|
|
if (s->direction == AMDTP_IN_STREAM)
|
|
err = queue_in_packet(s);
|
|
else
|
|
err = queue_out_packet(s, 0);
|
|
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) || (s->flags & CIP_NO_HEADER))
|
|
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 function is called in software IRQ context of period_tasklet or
|
|
* process context.
|
|
*
|
|
* When the software IRQ context was scheduled by software IRQ context
|
|
* of IR/IT contexts, queued packets were already handled. Therefore,
|
|
* no need to flush the queue in buffer anymore.
|
|
*
|
|
* When the process context reach here, some packets will be already
|
|
* queued in the buffer. These packets should be handled immediately
|
|
* to keep better granularity of PCM pointer.
|
|
*
|
|
* Later, the process context will sometimes schedules software IRQ
|
|
* context of the period_tasklet. Then, no need to flush the queue by
|
|
* the same reason as described for IR/IT contexts.
|
|
*/
|
|
if (!in_interrupt() && amdtp_stream_running(s))
|
|
fw_iso_context_flush_completions(s->context);
|
|
|
|
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
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* @s: the AMDTP stream about to be stopped
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*
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* If the isochronous stream needs to be stopped asynchronously, call this
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* function first to stop the PCM device.
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*/
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void amdtp_stream_pcm_abort(struct amdtp_stream *s)
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{
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struct snd_pcm_substream *pcm;
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pcm = ACCESS_ONCE(s->pcm);
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if (pcm)
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snd_pcm_stop_xrun(pcm);
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}
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EXPORT_SYMBOL(amdtp_stream_pcm_abort);
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