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Some devices have a quirk to postpone transmission of isoc packet for several dozen or hundred isoc cycles since configured to transmit. Furthermore, some devices have a quirk to transmit isoc packet with discontinued data of its header. In 1394 OHCI specification, software allows to start isoc context with certain isoc cycle. Linux firewire subsystem has kernel API to use it as well. This commit uses the functionality of 1394 OHCI controller to handle the quirks. At present, this feature is convenient to ALSA bebob and fireface driver. As a result, some devices can be safely handled, as long as I know: - MAudio FireWire solo - MAudio ProFire Lightbridge - MAudio FireWire 410 - Roland FA-66 Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20191018061911.24909-7-o-takashi@sakamocchi.jp Signed-off-by: Takashi Iwai <tiwai@suse.de>
308 lines
8.9 KiB
C
308 lines
8.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef SOUND_FIREWIRE_AMDTP_H_INCLUDED
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#define SOUND_FIREWIRE_AMDTP_H_INCLUDED
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <sound/asound.h>
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#include "packets-buffer.h"
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/**
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* enum cip_flags - describes details of the streaming protocol
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* @CIP_NONBLOCKING: In non-blocking mode, each packet contains
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* sample_rate/8000 samples, with rounding up or down to adjust
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* for clock skew and left-over fractional samples. This should
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* be used if supported by the device.
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* @CIP_BLOCKING: In blocking mode, each packet contains either zero or
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* SYT_INTERVAL samples, with these two types alternating so that
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* the overall sample rate comes out right.
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* @CIP_EMPTY_WITH_TAG0: Only for in-stream. Empty in-packets have TAG0.
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* @CIP_DBC_IS_END_EVENT: The value of dbc in an packet corresponds to the end
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* of event in the packet. Out of IEC 61883.
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* @CIP_WRONG_DBS: Only for in-stream. The value of dbs is wrong in in-packets.
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* The value of data_block_quadlets is used instead of reported value.
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* @CIP_SKIP_DBC_ZERO_CHECK: Only for in-stream. Packets with zero in dbc is
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* skipped for detecting discontinuity.
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* @CIP_EMPTY_HAS_WRONG_DBC: Only for in-stream. The value of dbc in empty
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* packet is wrong but the others are correct.
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* @CIP_JUMBO_PAYLOAD: Only for in-stream. The number of data blocks in an
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* packet is larger than IEC 61883-6 defines. Current implementation
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* allows 5 times as large as IEC 61883-6 defines.
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* @CIP_HEADER_WITHOUT_EOH: Only for in-stream. CIP Header doesn't include
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* valid EOH.
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* @CIP_NO_HEADERS: a lack of headers in packets
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* @CIP_UNALIGHED_DBC: Only for in-stream. The value of dbc is not alighed to
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* the value of current SYT_INTERVAL; e.g. initial value is not zero.
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*/
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enum cip_flags {
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CIP_NONBLOCKING = 0x00,
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CIP_BLOCKING = 0x01,
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CIP_EMPTY_WITH_TAG0 = 0x02,
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CIP_DBC_IS_END_EVENT = 0x04,
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CIP_WRONG_DBS = 0x08,
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CIP_SKIP_DBC_ZERO_CHECK = 0x10,
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CIP_EMPTY_HAS_WRONG_DBC = 0x20,
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CIP_JUMBO_PAYLOAD = 0x40,
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CIP_HEADER_WITHOUT_EOH = 0x80,
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CIP_NO_HEADER = 0x100,
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CIP_UNALIGHED_DBC = 0x200,
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};
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/**
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* enum cip_sfc - supported Sampling Frequency Codes (SFCs)
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* @CIP_SFC_32000: 32,000 data blocks
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* @CIP_SFC_44100: 44,100 data blocks
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* @CIP_SFC_48000: 48,000 data blocks
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* @CIP_SFC_88200: 88,200 data blocks
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* @CIP_SFC_96000: 96,000 data blocks
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* @CIP_SFC_176400: 176,400 data blocks
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* @CIP_SFC_192000: 192,000 data blocks
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* @CIP_SFC_COUNT: the number of supported SFCs
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*
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* These values are used to show nominal Sampling Frequency Code in
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* Format Dependent Field (FDF) of AMDTP packet header. In IEC 61883-6:2002,
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* this code means the number of events per second. Actually the code
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* represents the number of data blocks transferred per second in an AMDTP
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* stream.
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*
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* In IEC 61883-6:2005, some extensions were added to support more types of
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* data such as 'One Bit LInear Audio', therefore the meaning of SFC became
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* different depending on the types.
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*
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* Currently our implementation is compatible with IEC 61883-6:2002.
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*/
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enum cip_sfc {
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CIP_SFC_32000 = 0,
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CIP_SFC_44100 = 1,
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CIP_SFC_48000 = 2,
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CIP_SFC_88200 = 3,
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CIP_SFC_96000 = 4,
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CIP_SFC_176400 = 5,
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CIP_SFC_192000 = 6,
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CIP_SFC_COUNT
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};
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struct fw_unit;
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struct fw_iso_context;
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struct snd_pcm_substream;
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struct snd_pcm_runtime;
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enum amdtp_stream_direction {
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AMDTP_OUT_STREAM = 0,
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AMDTP_IN_STREAM
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};
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struct pkt_desc {
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u32 cycle;
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u32 syt;
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unsigned int data_blocks;
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unsigned int data_block_counter;
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__be32 *ctx_payload;
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};
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struct amdtp_stream;
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typedef unsigned int (*amdtp_stream_process_ctx_payloads_t)(
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struct amdtp_stream *s,
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const struct pkt_desc *desc,
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unsigned int packets,
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struct snd_pcm_substream *pcm);
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struct amdtp_stream {
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struct fw_unit *unit;
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enum cip_flags flags;
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enum amdtp_stream_direction direction;
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struct mutex mutex;
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/* For packet processing. */
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struct fw_iso_context *context;
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struct iso_packets_buffer buffer;
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unsigned int queue_size;
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int packet_index;
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struct pkt_desc *pkt_descs;
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int tag;
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union {
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struct {
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unsigned int ctx_header_size;
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// limit for payload of iso packet.
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unsigned int max_ctx_payload_length;
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// For quirks of CIP headers.
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// Fixed interval of dbc between previos/current
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// packets.
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unsigned int dbc_interval;
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} tx;
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struct {
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// To calculate CIP data blocks and tstamp.
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unsigned int transfer_delay;
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unsigned int data_block_state;
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unsigned int last_syt_offset;
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unsigned int syt_offset_state;
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// To generate CIP header.
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unsigned int fdf;
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int syt_override;
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// To generate constant hardware IRQ.
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unsigned int event_count;
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unsigned int events_per_period;
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} rx;
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} ctx_data;
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/* For CIP headers. */
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unsigned int source_node_id_field;
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unsigned int data_block_quadlets;
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unsigned int data_block_counter;
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unsigned int sph;
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unsigned int fmt;
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/* Internal flags. */
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enum cip_sfc sfc;
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unsigned int syt_interval;
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/* For a PCM substream processing. */
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struct snd_pcm_substream *pcm;
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struct tasklet_struct period_tasklet;
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snd_pcm_uframes_t pcm_buffer_pointer;
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unsigned int pcm_period_pointer;
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/* To wait for first packet. */
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bool callbacked;
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wait_queue_head_t callback_wait;
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u32 start_cycle;
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/* For backends to process data blocks. */
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void *protocol;
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amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
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// For domain.
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int channel;
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int speed;
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struct list_head list;
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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_ctx_payloads_t process_ctx_payloads,
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unsigned int protocol_size);
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void amdtp_stream_destroy(struct amdtp_stream *s);
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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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unsigned int amdtp_stream_get_max_payload(struct amdtp_stream *s);
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void amdtp_stream_update(struct amdtp_stream *s);
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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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void amdtp_stream_pcm_prepare(struct amdtp_stream *s);
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void amdtp_stream_pcm_abort(struct amdtp_stream *s);
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extern const unsigned int amdtp_syt_intervals[CIP_SFC_COUNT];
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extern const unsigned int amdtp_rate_table[CIP_SFC_COUNT];
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/**
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* amdtp_stream_running - check stream is running or not
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* @s: the AMDTP stream
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*
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* If this function returns true, the stream is running.
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*/
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static inline bool amdtp_stream_running(struct amdtp_stream *s)
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{
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return !IS_ERR(s->context);
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}
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/**
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* amdtp_streaming_error - check for streaming error
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* @s: the AMDTP stream
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*
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* If this function returns true, the stream's packet queue has stopped due to
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* an asynchronous error.
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*/
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static inline bool amdtp_streaming_error(struct amdtp_stream *s)
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{
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return s->packet_index < 0;
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}
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/**
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* amdtp_stream_pcm_running - check PCM substream is running or not
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* @s: the AMDTP stream
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*
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* If this function returns true, PCM substream in the AMDTP stream is running.
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*/
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static inline bool amdtp_stream_pcm_running(struct amdtp_stream *s)
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{
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return !!s->pcm;
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}
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/**
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* amdtp_stream_pcm_trigger - start/stop playback from a PCM device
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* @s: the AMDTP stream
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* @pcm: the PCM device to be started, or %NULL to stop the current device
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*
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* Call this function on a running isochronous stream to enable the actual
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* transmission of PCM data. This function should be called from the PCM
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* device's .trigger callback.
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*/
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static inline void amdtp_stream_pcm_trigger(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm)
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{
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WRITE_ONCE(s->pcm, pcm);
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}
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static inline bool cip_sfc_is_base_44100(enum cip_sfc sfc)
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{
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return sfc & 1;
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}
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/**
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* amdtp_stream_wait_callback - sleep till callbacked or timeout
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* @s: the AMDTP stream
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* @timeout: msec till timeout
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*
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* If this function return false, the AMDTP stream should be stopped.
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*/
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static inline bool amdtp_stream_wait_callback(struct amdtp_stream *s,
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unsigned int timeout)
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{
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return wait_event_timeout(s->callback_wait,
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s->callbacked == true,
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msecs_to_jiffies(timeout)) > 0;
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}
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struct amdtp_domain {
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struct list_head streams;
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unsigned int events_per_period;
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unsigned int events_per_buffer;
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struct amdtp_stream *irq_target;
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};
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int amdtp_domain_init(struct amdtp_domain *d);
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void amdtp_domain_destroy(struct amdtp_domain *d);
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int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
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int channel, int speed);
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int amdtp_domain_start(struct amdtp_domain *d, unsigned int ir_delay_cycle);
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void amdtp_domain_stop(struct amdtp_domain *d);
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static inline int amdtp_domain_set_events_per_period(struct amdtp_domain *d,
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unsigned int events_per_period,
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unsigned int events_per_buffer)
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{
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d->events_per_period = events_per_period;
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d->events_per_buffer = events_per_buffer;
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return 0;
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}
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unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d,
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struct amdtp_stream *s);
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int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s);
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#endif
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