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51bc581a21
In preparation for unconditionally passing the struct tasklet_struct pointer to all tasklet callbacks, switch to using the new tasklet_setup() and from_tasklet() to pass the tasklet pointer explicitly. Signed-off-by: Romain Perier <romain.perier@gmail.com> Signed-off-by: Allen Pais <allen.lkml@gmail.com> Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20200902040221.354941-3-allen.lkml@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
1525 lines
41 KiB
C
1525 lines
41 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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*/
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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/firewire-constants.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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#define OHCI_MAX_SECOND 8
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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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// For iso header, tstamp and 2 CIP header.
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#define IR_CTX_HEADER_SIZE_CIP 16
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// For iso header and tstamp.
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#define IR_CTX_HEADER_SIZE_NO_CIP 8
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#define HEADER_TSTAMP_MASK 0x0000ffff
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#define IT_PKT_HEADER_SIZE_CIP 8 // For 2 CIP header.
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#define IT_PKT_HEADER_SIZE_NO_CIP 0 // Nothing.
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static void pcm_period_tasklet(struct tasklet_struct *t);
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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_ctx_payloads: callback handler to process payloads of isoc context
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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_ctx_payloads_t process_ctx_payloads,
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unsigned int protocol_size)
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{
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if (process_ctx_payloads == 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_setup(&s->period_tasklet, pcm_period_tasklet);
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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_ctx_payloads = process_ctx_payloads;
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if (dir == AMDTP_OUT_STREAM)
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s->ctx_data.rx.syt_override = -1;
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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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static int apply_constraint_to_size(struct snd_pcm_hw_params *params,
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struct snd_pcm_hw_rule *rule)
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{
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struct snd_interval *s = hw_param_interval(params, rule->var);
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const struct snd_interval *r =
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hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_RATE);
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struct snd_interval t = {0};
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unsigned int step = 0;
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int i;
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for (i = 0; i < CIP_SFC_COUNT; ++i) {
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if (snd_interval_test(r, amdtp_rate_table[i]))
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step = max(step, amdtp_syt_intervals[i]);
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}
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t.min = roundup(s->min, step);
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t.max = rounddown(s->max, step);
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t.integer = 1;
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return snd_interval_refine(s, &t);
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}
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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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struct snd_pcm_hardware *hw = &runtime->hw;
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unsigned int ctx_header_size;
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unsigned int maximum_usec_per_period;
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int err;
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hw->info = SNDRV_PCM_INFO_BATCH |
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SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_JOINT_DUPLEX |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_MMAP_VALID;
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/* SNDRV_PCM_INFO_BATCH */
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hw->periods_min = 2;
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hw->periods_max = UINT_MAX;
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/* bytes for a frame */
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hw->period_bytes_min = 4 * hw->channels_max;
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/* Just to prevent from allocating much pages. */
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hw->period_bytes_max = hw->period_bytes_min * 2048;
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hw->buffer_bytes_max = hw->period_bytes_max * hw->periods_min;
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// Linux driver for 1394 OHCI controller voluntarily flushes isoc
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// context when total size of accumulated context header reaches
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// PAGE_SIZE. This kicks tasklet for the isoc context and brings
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// callback in the middle of scheduled interrupts.
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// Although AMDTP streams in the same domain use the same events per
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// IRQ, use the largest size of context header between IT/IR contexts.
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// Here, use the value of context header in IR context is for both
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// contexts.
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if (!(s->flags & CIP_NO_HEADER))
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ctx_header_size = IR_CTX_HEADER_SIZE_CIP;
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else
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ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP;
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maximum_usec_per_period = USEC_PER_SEC * PAGE_SIZE /
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CYCLES_PER_SECOND / ctx_header_size;
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// In IEC 61883-6, one isoc packet can transfer events up to the value
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// of syt interval. This comes from the interval of isoc cycle. As 1394
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// OHCI controller can generate hardware IRQ per isoc packet, the
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// interval is 125 usec.
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// However, there are two ways of transmission in IEC 61883-6; blocking
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// and non-blocking modes. In blocking mode, the sequence of isoc packet
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// includes 'empty' or 'NODATA' packets which include no event. In
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// non-blocking mode, the number of events per packet is variable up to
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// the syt interval.
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// Due to the above protocol design, the minimum PCM frames per
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// interrupt should be double of the value of syt interval, thus it is
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// 250 usec.
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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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250, maximum_usec_per_period);
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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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err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
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apply_constraint_to_size, NULL,
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SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
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SNDRV_PCM_HW_PARAM_RATE, -1);
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if (err < 0)
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goto end;
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err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
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apply_constraint_to_size, NULL,
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SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
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SNDRV_PCM_HW_PARAM_RATE, -1);
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if (err < 0)
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goto end;
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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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if (s->direction == AMDTP_OUT_STREAM) {
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s->ctx_data.rx.transfer_delay =
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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
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// packets.
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s->ctx_data.rx.transfer_delay +=
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TICKS_PER_SECOND * s->syt_interval / rate;
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}
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}
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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 cip_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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cip_header_size = sizeof(__be32) * 2;
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return cip_header_size +
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s->syt_interval * s->data_block_quadlets * sizeof(__be32) * 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(unsigned int *data_block_state,
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bool is_blocking, bool is_no_info,
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unsigned int syt_interval, enum cip_sfc sfc)
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{
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unsigned int data_blocks;
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/* Blocking mode. */
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if (is_blocking) {
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/* This module generate empty packet for 'no data'. */
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if (is_no_info)
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data_blocks = 0;
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else
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data_blocks = syt_interval;
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/* Non-blocking mode. */
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} else {
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if (!cip_sfc_is_base_44100(sfc)) {
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// Sample_rate / 8000 is an integer, and precomputed.
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data_blocks = *data_block_state;
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} else {
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unsigned int phase = *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 (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 * (sfc >> 1) + (phase == 0);
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if (++phase >= (80 >> (sfc >> 1)))
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phase = 0;
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*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_offset(unsigned int *last_syt_offset,
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unsigned int *syt_offset_state, enum cip_sfc sfc)
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{
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unsigned int syt_offset;
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if (*last_syt_offset < TICKS_PER_CYCLE) {
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if (!cip_sfc_is_base_44100(sfc))
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syt_offset = *last_syt_offset + *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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unsigned int phase = *syt_offset_state;
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unsigned int index = phase % 13;
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syt_offset = *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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*syt_offset_state = phase;
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}
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} else
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syt_offset = *last_syt_offset - TICKS_PER_CYCLE;
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*last_syt_offset = syt_offset;
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if (syt_offset >= TICKS_PER_CYCLE)
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syt_offset = CIP_SYT_NO_INFO;
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return syt_offset;
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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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WRITE_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(struct tasklet_struct *t)
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{
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struct amdtp_stream *s = from_tasklet(s, t, period_tasklet);
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struct snd_pcm_substream *pcm = READ_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, struct fw_iso_packet *params,
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bool sched_irq)
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{
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int err;
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params->interrupt = sched_irq;
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params->tag = s->tag;
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params->sy = 0;
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err = fw_iso_context_queue(s->context, params, &s->buffer.iso_buffer,
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s->buffer.packets[s->packet_index].offset);
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if (err < 0) {
|
|
dev_err(&s->unit->device, "queueing error: %d\n", err);
|
|
goto end;
|
|
}
|
|
|
|
if (++s->packet_index >= s->queue_size)
|
|
s->packet_index = 0;
|
|
end:
|
|
return err;
|
|
}
|
|
|
|
static inline int queue_out_packet(struct amdtp_stream *s,
|
|
struct fw_iso_packet *params, bool sched_irq)
|
|
{
|
|
params->skip =
|
|
!!(params->header_length == 0 && params->payload_length == 0);
|
|
return queue_packet(s, params, sched_irq);
|
|
}
|
|
|
|
static inline int queue_in_packet(struct amdtp_stream *s,
|
|
struct fw_iso_packet *params)
|
|
{
|
|
// Queue one packet for IR context.
|
|
params->header_length = s->ctx_data.tx.ctx_header_size;
|
|
params->payload_length = s->ctx_data.tx.max_ctx_payload_length;
|
|
params->skip = false;
|
|
return queue_packet(s, params, false);
|
|
}
|
|
|
|
static void generate_cip_header(struct amdtp_stream *s, __be32 cip_header[2],
|
|
unsigned int data_block_counter, unsigned int syt)
|
|
{
|
|
cip_header[0] = cpu_to_be32(READ_ONCE(s->source_node_id_field) |
|
|
(s->data_block_quadlets << CIP_DBS_SHIFT) |
|
|
((s->sph << CIP_SPH_SHIFT) & CIP_SPH_MASK) |
|
|
data_block_counter);
|
|
cip_header[1] = cpu_to_be32(CIP_EOH |
|
|
((s->fmt << CIP_FMT_SHIFT) & CIP_FMT_MASK) |
|
|
((s->ctx_data.rx.fdf << CIP_FDF_SHIFT) & CIP_FDF_MASK) |
|
|
(syt & CIP_SYT_MASK));
|
|
}
|
|
|
|
static void build_it_pkt_header(struct amdtp_stream *s, unsigned int cycle,
|
|
struct fw_iso_packet *params,
|
|
unsigned int data_blocks,
|
|
unsigned int data_block_counter,
|
|
unsigned int syt, unsigned int index)
|
|
{
|
|
unsigned int payload_length;
|
|
__be32 *cip_header;
|
|
|
|
payload_length = data_blocks * sizeof(__be32) * s->data_block_quadlets;
|
|
params->payload_length = payload_length;
|
|
|
|
if (!(s->flags & CIP_NO_HEADER)) {
|
|
cip_header = (__be32 *)params->header;
|
|
generate_cip_header(s, cip_header, data_block_counter, syt);
|
|
params->header_length = 2 * sizeof(__be32);
|
|
payload_length += params->header_length;
|
|
} else {
|
|
cip_header = NULL;
|
|
}
|
|
|
|
trace_amdtp_packet(s, cycle, cip_header, payload_length, data_blocks,
|
|
data_block_counter, index);
|
|
}
|
|
|
|
static int check_cip_header(struct amdtp_stream *s, const __be32 *buf,
|
|
unsigned int payload_length,
|
|
unsigned int *data_blocks,
|
|
unsigned int *data_block_counter, unsigned int *syt)
|
|
{
|
|
u32 cip_header[2];
|
|
unsigned int sph;
|
|
unsigned int fmt;
|
|
unsigned int fdf;
|
|
unsigned int dbc;
|
|
bool lost;
|
|
|
|
cip_header[0] = be32_to_cpu(buf[0]);
|
|
cip_header[1] = be32_to_cpu(buf[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)) &&
|
|
(!(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]);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* 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]);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
/* Calculate data blocks */
|
|
fdf = (cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SHIFT;
|
|
if (payload_length < sizeof(__be32) * 2 ||
|
|
(fmt == CIP_FMT_AM && fdf == AMDTP_FDF_NO_DATA)) {
|
|
*data_blocks = 0;
|
|
} else {
|
|
unsigned int 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 / sizeof(__be32) - 2) /
|
|
data_block_quadlets;
|
|
}
|
|
|
|
/* Check data block counter continuity */
|
|
dbc = cip_header[0] & CIP_DBC_MASK;
|
|
if (*data_blocks == 0 && (s->flags & CIP_EMPTY_HAS_WRONG_DBC) &&
|
|
*data_block_counter != UINT_MAX)
|
|
dbc = *data_block_counter;
|
|
|
|
if ((dbc == 0x00 && (s->flags & CIP_SKIP_DBC_ZERO_CHECK)) ||
|
|
*data_block_counter == UINT_MAX) {
|
|
lost = false;
|
|
} else if (!(s->flags & CIP_DBC_IS_END_EVENT)) {
|
|
lost = dbc != *data_block_counter;
|
|
} else {
|
|
unsigned int dbc_interval;
|
|
|
|
if (*data_blocks > 0 && s->ctx_data.tx.dbc_interval > 0)
|
|
dbc_interval = s->ctx_data.tx.dbc_interval;
|
|
else
|
|
dbc_interval = *data_blocks;
|
|
|
|
lost = dbc != ((*data_block_counter + dbc_interval) & 0xff);
|
|
}
|
|
|
|
if (lost) {
|
|
dev_err(&s->unit->device,
|
|
"Detect discontinuity of CIP: %02X %02X\n",
|
|
*data_block_counter, dbc);
|
|
return -EIO;
|
|
}
|
|
|
|
*data_block_counter = dbc;
|
|
|
|
*syt = cip_header[1] & CIP_SYT_MASK;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int parse_ir_ctx_header(struct amdtp_stream *s, unsigned int cycle,
|
|
const __be32 *ctx_header,
|
|
unsigned int *payload_length,
|
|
unsigned int *data_blocks,
|
|
unsigned int *data_block_counter,
|
|
unsigned int *syt, unsigned int index)
|
|
{
|
|
const __be32 *cip_header;
|
|
int err;
|
|
|
|
*payload_length = be32_to_cpu(ctx_header[0]) >> ISO_DATA_LENGTH_SHIFT;
|
|
if (*payload_length > s->ctx_data.tx.ctx_header_size +
|
|
s->ctx_data.tx.max_ctx_payload_length) {
|
|
dev_err(&s->unit->device,
|
|
"Detect jumbo payload: %04x %04x\n",
|
|
*payload_length, s->ctx_data.tx.max_ctx_payload_length);
|
|
return -EIO;
|
|
}
|
|
|
|
if (!(s->flags & CIP_NO_HEADER)) {
|
|
cip_header = ctx_header + 2;
|
|
err = check_cip_header(s, cip_header, *payload_length,
|
|
data_blocks, data_block_counter, syt);
|
|
if (err < 0)
|
|
return err;
|
|
} else {
|
|
cip_header = NULL;
|
|
err = 0;
|
|
*data_blocks = *payload_length / sizeof(__be32) /
|
|
s->data_block_quadlets;
|
|
*syt = 0;
|
|
|
|
if (*data_block_counter == UINT_MAX)
|
|
*data_block_counter = 0;
|
|
}
|
|
|
|
trace_amdtp_packet(s, cycle, cip_header, *payload_length, *data_blocks,
|
|
*data_block_counter, index);
|
|
|
|
return err;
|
|
}
|
|
|
|
// 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(__be32 ctx_header_tstamp)
|
|
{
|
|
u32 tstamp = be32_to_cpu(ctx_header_tstamp) & HEADER_TSTAMP_MASK;
|
|
return (((tstamp >> 13) & 0x07) * 8000) + (tstamp & 0x1fff);
|
|
}
|
|
|
|
static inline u32 increment_cycle_count(u32 cycle, unsigned int addend)
|
|
{
|
|
cycle += addend;
|
|
if (cycle >= OHCI_MAX_SECOND * CYCLES_PER_SECOND)
|
|
cycle -= OHCI_MAX_SECOND * CYCLES_PER_SECOND;
|
|
return cycle;
|
|
}
|
|
|
|
// Align to actual cycle count for the packet which is going to be scheduled.
|
|
// This module queued the same number of isochronous cycle as the size of queue
|
|
// to kip isochronous cycle, therefore it's OK to just increment the cycle by
|
|
// the size of queue for scheduled cycle.
|
|
static inline u32 compute_it_cycle(const __be32 ctx_header_tstamp,
|
|
unsigned int queue_size)
|
|
{
|
|
u32 cycle = compute_cycle_count(ctx_header_tstamp);
|
|
return increment_cycle_count(cycle, queue_size);
|
|
}
|
|
|
|
static int generate_device_pkt_descs(struct amdtp_stream *s,
|
|
struct pkt_desc *descs,
|
|
const __be32 *ctx_header,
|
|
unsigned int packets)
|
|
{
|
|
unsigned int dbc = s->data_block_counter;
|
|
int i;
|
|
int err;
|
|
|
|
for (i = 0; i < packets; ++i) {
|
|
struct pkt_desc *desc = descs + i;
|
|
unsigned int index = (s->packet_index + i) % s->queue_size;
|
|
unsigned int cycle;
|
|
unsigned int payload_length;
|
|
unsigned int data_blocks;
|
|
unsigned int syt;
|
|
|
|
cycle = compute_cycle_count(ctx_header[1]);
|
|
|
|
err = parse_ir_ctx_header(s, cycle, ctx_header, &payload_length,
|
|
&data_blocks, &dbc, &syt, i);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
desc->cycle = cycle;
|
|
desc->syt = syt;
|
|
desc->data_blocks = data_blocks;
|
|
desc->data_block_counter = dbc;
|
|
desc->ctx_payload = s->buffer.packets[index].buffer;
|
|
|
|
if (!(s->flags & CIP_DBC_IS_END_EVENT))
|
|
dbc = (dbc + desc->data_blocks) & 0xff;
|
|
|
|
ctx_header +=
|
|
s->ctx_data.tx.ctx_header_size / sizeof(*ctx_header);
|
|
}
|
|
|
|
s->data_block_counter = dbc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static unsigned int compute_syt(unsigned int syt_offset, unsigned int cycle,
|
|
unsigned int transfer_delay)
|
|
{
|
|
unsigned int syt;
|
|
|
|
syt_offset += transfer_delay;
|
|
syt = ((cycle + syt_offset / TICKS_PER_CYCLE) << 12) |
|
|
(syt_offset % TICKS_PER_CYCLE);
|
|
return syt & CIP_SYT_MASK;
|
|
}
|
|
|
|
static void generate_pkt_descs(struct amdtp_stream *s, struct pkt_desc *descs,
|
|
const __be32 *ctx_header, unsigned int packets,
|
|
const struct seq_desc *seq_descs,
|
|
unsigned int seq_size)
|
|
{
|
|
unsigned int dbc = s->data_block_counter;
|
|
unsigned int seq_index = s->ctx_data.rx.seq_index;
|
|
int i;
|
|
|
|
for (i = 0; i < packets; ++i) {
|
|
struct pkt_desc *desc = descs + i;
|
|
unsigned int index = (s->packet_index + i) % s->queue_size;
|
|
const struct seq_desc *seq = seq_descs + seq_index;
|
|
unsigned int syt;
|
|
|
|
desc->cycle = compute_it_cycle(*ctx_header, s->queue_size);
|
|
|
|
syt = seq->syt_offset;
|
|
if (syt != CIP_SYT_NO_INFO) {
|
|
syt = compute_syt(syt, desc->cycle,
|
|
s->ctx_data.rx.transfer_delay);
|
|
}
|
|
desc->syt = syt;
|
|
desc->data_blocks = seq->data_blocks;
|
|
|
|
if (s->flags & CIP_DBC_IS_END_EVENT)
|
|
dbc = (dbc + desc->data_blocks) & 0xff;
|
|
|
|
desc->data_block_counter = dbc;
|
|
|
|
if (!(s->flags & CIP_DBC_IS_END_EVENT))
|
|
dbc = (dbc + desc->data_blocks) & 0xff;
|
|
|
|
desc->ctx_payload = s->buffer.packets[index].buffer;
|
|
|
|
seq_index = (seq_index + 1) % seq_size;
|
|
|
|
++ctx_header;
|
|
}
|
|
|
|
s->data_block_counter = dbc;
|
|
s->ctx_data.rx.seq_index = seq_index;
|
|
}
|
|
|
|
static inline void cancel_stream(struct amdtp_stream *s)
|
|
{
|
|
s->packet_index = -1;
|
|
if (in_interrupt())
|
|
amdtp_stream_pcm_abort(s);
|
|
WRITE_ONCE(s->pcm_buffer_pointer, SNDRV_PCM_POS_XRUN);
|
|
}
|
|
|
|
static void process_ctx_payloads(struct amdtp_stream *s,
|
|
const struct pkt_desc *descs,
|
|
unsigned int packets)
|
|
{
|
|
struct snd_pcm_substream *pcm;
|
|
unsigned int pcm_frames;
|
|
|
|
pcm = READ_ONCE(s->pcm);
|
|
pcm_frames = s->process_ctx_payloads(s, descs, packets, pcm);
|
|
if (pcm)
|
|
update_pcm_pointers(s, pcm, pcm_frames);
|
|
}
|
|
|
|
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;
|
|
const struct amdtp_domain *d = s->domain;
|
|
const __be32 *ctx_header = header;
|
|
unsigned int events_per_period = s->ctx_data.rx.events_per_period;
|
|
unsigned int event_count = s->ctx_data.rx.event_count;
|
|
unsigned int packets;
|
|
int i;
|
|
|
|
if (s->packet_index < 0)
|
|
return;
|
|
|
|
// Calculate the number of packets in buffer and check XRUN.
|
|
packets = header_length / sizeof(*ctx_header);
|
|
|
|
generate_pkt_descs(s, s->pkt_descs, ctx_header, packets, d->seq_descs,
|
|
d->seq_size);
|
|
|
|
process_ctx_payloads(s, s->pkt_descs, packets);
|
|
|
|
for (i = 0; i < packets; ++i) {
|
|
const struct pkt_desc *desc = s->pkt_descs + i;
|
|
unsigned int syt;
|
|
struct {
|
|
struct fw_iso_packet params;
|
|
__be32 header[IT_PKT_HEADER_SIZE_CIP / sizeof(__be32)];
|
|
} template = { {0}, {0} };
|
|
bool sched_irq = false;
|
|
|
|
if (s->ctx_data.rx.syt_override < 0)
|
|
syt = desc->syt;
|
|
else
|
|
syt = s->ctx_data.rx.syt_override;
|
|
|
|
build_it_pkt_header(s, desc->cycle, &template.params,
|
|
desc->data_blocks, desc->data_block_counter,
|
|
syt, i);
|
|
|
|
if (s == s->domain->irq_target) {
|
|
event_count += desc->data_blocks;
|
|
if (event_count >= events_per_period) {
|
|
event_count -= events_per_period;
|
|
sched_irq = true;
|
|
}
|
|
}
|
|
|
|
if (queue_out_packet(s, &template.params, sched_irq) < 0) {
|
|
cancel_stream(s);
|
|
return;
|
|
}
|
|
}
|
|
|
|
s->ctx_data.rx.event_count = event_count;
|
|
}
|
|
|
|
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;
|
|
__be32 *ctx_header = header;
|
|
unsigned int packets;
|
|
int i;
|
|
int err;
|
|
|
|
if (s->packet_index < 0)
|
|
return;
|
|
|
|
// Calculate the number of packets in buffer and check XRUN.
|
|
packets = header_length / s->ctx_data.tx.ctx_header_size;
|
|
|
|
err = generate_device_pkt_descs(s, s->pkt_descs, ctx_header, packets);
|
|
if (err < 0) {
|
|
if (err != -EAGAIN) {
|
|
cancel_stream(s);
|
|
return;
|
|
}
|
|
} else {
|
|
process_ctx_payloads(s, s->pkt_descs, packets);
|
|
}
|
|
|
|
for (i = 0; i < packets; ++i) {
|
|
struct fw_iso_packet params = {0};
|
|
|
|
if (queue_in_packet(s, ¶ms) < 0) {
|
|
cancel_stream(s);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void pool_ideal_seq_descs(struct amdtp_domain *d, unsigned int packets)
|
|
{
|
|
struct amdtp_stream *irq_target = d->irq_target;
|
|
unsigned int seq_tail = d->seq_tail;
|
|
unsigned int seq_size = d->seq_size;
|
|
unsigned int min_avail;
|
|
struct amdtp_stream *s;
|
|
|
|
min_avail = d->seq_size;
|
|
list_for_each_entry(s, &d->streams, list) {
|
|
unsigned int seq_index;
|
|
unsigned int avail;
|
|
|
|
if (s->direction == AMDTP_IN_STREAM)
|
|
continue;
|
|
|
|
seq_index = s->ctx_data.rx.seq_index;
|
|
avail = d->seq_tail;
|
|
if (seq_index > avail)
|
|
avail += d->seq_size;
|
|
avail -= seq_index;
|
|
|
|
if (avail < min_avail)
|
|
min_avail = avail;
|
|
}
|
|
|
|
while (min_avail < packets) {
|
|
struct seq_desc *desc = d->seq_descs + seq_tail;
|
|
|
|
desc->syt_offset = calculate_syt_offset(&d->last_syt_offset,
|
|
&d->syt_offset_state, irq_target->sfc);
|
|
desc->data_blocks = calculate_data_blocks(&d->data_block_state,
|
|
!!(irq_target->flags & CIP_BLOCKING),
|
|
desc->syt_offset == CIP_SYT_NO_INFO,
|
|
irq_target->syt_interval, irq_target->sfc);
|
|
|
|
++seq_tail;
|
|
seq_tail %= seq_size;
|
|
|
|
++min_avail;
|
|
}
|
|
|
|
d->seq_tail = seq_tail;
|
|
}
|
|
|
|
static void irq_target_callback(struct fw_iso_context *context, u32 tstamp,
|
|
size_t header_length, void *header,
|
|
void *private_data)
|
|
{
|
|
struct amdtp_stream *irq_target = private_data;
|
|
struct amdtp_domain *d = irq_target->domain;
|
|
unsigned int packets = header_length / sizeof(__be32);
|
|
struct amdtp_stream *s;
|
|
|
|
// Record enough entries with extra 3 cycles at least.
|
|
pool_ideal_seq_descs(d, packets + 3);
|
|
|
|
out_stream_callback(context, tstamp, header_length, header, irq_target);
|
|
if (amdtp_streaming_error(irq_target))
|
|
goto error;
|
|
|
|
list_for_each_entry(s, &d->streams, list) {
|
|
if (s != irq_target && amdtp_stream_running(s)) {
|
|
fw_iso_context_flush_completions(s->context);
|
|
if (amdtp_streaming_error(s))
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
return;
|
|
error:
|
|
if (amdtp_stream_running(irq_target))
|
|
cancel_stream(irq_target);
|
|
|
|
list_for_each_entry(s, &d->streams, list) {
|
|
if (amdtp_stream_running(s))
|
|
cancel_stream(s);
|
|
}
|
|
}
|
|
|
|
// 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;
|
|
const __be32 *ctx_header = header;
|
|
u32 cycle;
|
|
|
|
/*
|
|
* 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) {
|
|
cycle = compute_cycle_count(ctx_header[1]);
|
|
|
|
context->callback.sc = in_stream_callback;
|
|
} else {
|
|
cycle = compute_it_cycle(*ctx_header, s->queue_size);
|
|
|
|
if (s == s->domain->irq_target)
|
|
context->callback.sc = irq_target_callback;
|
|
else
|
|
context->callback.sc = out_stream_callback;
|
|
}
|
|
|
|
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
|
|
* @start_cycle: the isochronous cycle to start the context. Start immediately
|
|
* if negative value is given.
|
|
* @queue_size: The number of packets in the queue.
|
|
* @idle_irq_interval: the interval to queue packet during initial state.
|
|
*
|
|
* 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.
|
|
*/
|
|
static int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed,
|
|
int start_cycle, unsigned int queue_size,
|
|
unsigned int idle_irq_interval)
|
|
{
|
|
bool is_irq_target = (s == s->domain->irq_target);
|
|
unsigned int ctx_header_size;
|
|
unsigned int max_ctx_payload_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) {
|
|
// NOTE: IT context should be used for constant IRQ.
|
|
if (is_irq_target) {
|
|
err = -EINVAL;
|
|
goto err_unlock;
|
|
}
|
|
|
|
s->data_block_counter = UINT_MAX;
|
|
} else {
|
|
s->data_block_counter = 0;
|
|
}
|
|
|
|
/* initialize packet buffer */
|
|
if (s->direction == AMDTP_IN_STREAM) {
|
|
dir = DMA_FROM_DEVICE;
|
|
type = FW_ISO_CONTEXT_RECEIVE;
|
|
if (!(s->flags & CIP_NO_HEADER))
|
|
ctx_header_size = IR_CTX_HEADER_SIZE_CIP;
|
|
else
|
|
ctx_header_size = IR_CTX_HEADER_SIZE_NO_CIP;
|
|
|
|
max_ctx_payload_size = amdtp_stream_get_max_payload(s) -
|
|
ctx_header_size;
|
|
} else {
|
|
dir = DMA_TO_DEVICE;
|
|
type = FW_ISO_CONTEXT_TRANSMIT;
|
|
ctx_header_size = 0; // No effect for IT context.
|
|
|
|
max_ctx_payload_size = amdtp_stream_get_max_payload(s);
|
|
if (!(s->flags & CIP_NO_HEADER))
|
|
max_ctx_payload_size -= IT_PKT_HEADER_SIZE_CIP;
|
|
}
|
|
|
|
err = iso_packets_buffer_init(&s->buffer, s->unit, queue_size,
|
|
max_ctx_payload_size, dir);
|
|
if (err < 0)
|
|
goto err_unlock;
|
|
s->queue_size = queue_size;
|
|
|
|
s->context = fw_iso_context_create(fw_parent_device(s->unit)->card,
|
|
type, channel, speed, ctx_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->direction == AMDTP_IN_STREAM) {
|
|
s->ctx_data.tx.max_ctx_payload_length = max_ctx_payload_size;
|
|
s->ctx_data.tx.ctx_header_size = ctx_header_size;
|
|
}
|
|
|
|
if (s->flags & CIP_NO_HEADER)
|
|
s->tag = TAG_NO_CIP_HEADER;
|
|
else
|
|
s->tag = TAG_CIP;
|
|
|
|
s->pkt_descs = kcalloc(s->queue_size, sizeof(*s->pkt_descs),
|
|
GFP_KERNEL);
|
|
if (!s->pkt_descs) {
|
|
err = -ENOMEM;
|
|
goto err_context;
|
|
}
|
|
|
|
s->packet_index = 0;
|
|
do {
|
|
struct fw_iso_packet params;
|
|
|
|
if (s->direction == AMDTP_IN_STREAM) {
|
|
err = queue_in_packet(s, ¶ms);
|
|
} else {
|
|
bool sched_irq = false;
|
|
|
|
params.header_length = 0;
|
|
params.payload_length = 0;
|
|
|
|
if (is_irq_target) {
|
|
sched_irq = !((s->packet_index + 1) %
|
|
idle_irq_interval);
|
|
}
|
|
|
|
err = queue_out_packet(s, ¶ms, sched_irq);
|
|
}
|
|
if (err < 0)
|
|
goto err_pkt_descs;
|
|
} 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, start_cycle, 0, tag);
|
|
if (err < 0)
|
|
goto err_pkt_descs;
|
|
|
|
mutex_unlock(&s->mutex);
|
|
|
|
return 0;
|
|
err_pkt_descs:
|
|
kfree(s->pkt_descs);
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* amdtp_domain_stream_pcm_pointer - get the PCM buffer position
|
|
* @d: the AMDTP domain.
|
|
* @s: the AMDTP stream that transports the PCM data
|
|
*
|
|
* Returns the current buffer position, in frames.
|
|
*/
|
|
unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d,
|
|
struct amdtp_stream *s)
|
|
{
|
|
struct amdtp_stream *irq_target = d->irq_target;
|
|
|
|
if (irq_target && amdtp_stream_running(irq_target)) {
|
|
// 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 IT contexts, queued packets were already handled.
|
|
// Therefore, no need to flush the queue in buffer furthermore.
|
|
//
|
|
// 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 in the above
|
|
if (!in_interrupt()) {
|
|
// Queued packet should be processed without any kernel
|
|
// preemption to keep latency against bus cycle.
|
|
preempt_disable();
|
|
fw_iso_context_flush_completions(irq_target->context);
|
|
preempt_enable();
|
|
}
|
|
}
|
|
|
|
return READ_ONCE(s->pcm_buffer_pointer);
|
|
}
|
|
EXPORT_SYMBOL_GPL(amdtp_domain_stream_pcm_pointer);
|
|
|
|
/**
|
|
* amdtp_domain_stream_pcm_ack - acknowledge queued PCM frames
|
|
* @d: the AMDTP domain.
|
|
* @s: the AMDTP stream that transfers the PCM frames
|
|
*
|
|
* Returns zero always.
|
|
*/
|
|
int amdtp_domain_stream_pcm_ack(struct amdtp_domain *d, struct amdtp_stream *s)
|
|
{
|
|
struct amdtp_stream *irq_target = d->irq_target;
|
|
|
|
// Process isochronous packets for recent isochronous cycle to handle
|
|
// queued PCM frames.
|
|
if (irq_target && amdtp_stream_running(irq_target)) {
|
|
// Queued packet should be processed without any kernel
|
|
// preemption to keep latency against bus cycle.
|
|
preempt_disable();
|
|
fw_iso_context_flush_completions(irq_target->context);
|
|
preempt_enable();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amdtp_domain_stream_pcm_ack);
|
|
|
|
/**
|
|
* amdtp_stream_update - update the stream after a bus reset
|
|
* @s: the AMDTP stream
|
|
*/
|
|
void amdtp_stream_update(struct amdtp_stream *s)
|
|
{
|
|
/* Precomputing. */
|
|
WRITE_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.
|
|
*/
|
|
static 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);
|
|
kfree(s->pkt_descs);
|
|
|
|
s->callbacked = false;
|
|
|
|
mutex_unlock(&s->mutex);
|
|
}
|
|
|
|
/**
|
|
* 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 = READ_ONCE(s->pcm);
|
|
if (pcm)
|
|
snd_pcm_stop_xrun(pcm);
|
|
}
|
|
EXPORT_SYMBOL(amdtp_stream_pcm_abort);
|
|
|
|
/**
|
|
* amdtp_domain_init - initialize an AMDTP domain structure
|
|
* @d: the AMDTP domain to initialize.
|
|
*/
|
|
int amdtp_domain_init(struct amdtp_domain *d)
|
|
{
|
|
INIT_LIST_HEAD(&d->streams);
|
|
|
|
d->events_per_period = 0;
|
|
|
|
d->seq_descs = NULL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amdtp_domain_init);
|
|
|
|
/**
|
|
* amdtp_domain_destroy - destroy an AMDTP domain structure
|
|
* @d: the AMDTP domain to destroy.
|
|
*/
|
|
void amdtp_domain_destroy(struct amdtp_domain *d)
|
|
{
|
|
// At present nothing to do.
|
|
return;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amdtp_domain_destroy);
|
|
|
|
/**
|
|
* amdtp_domain_add_stream - register isoc context into the domain.
|
|
* @d: the AMDTP domain.
|
|
* @s: the AMDTP stream.
|
|
* @channel: the isochronous channel on the bus.
|
|
* @speed: firewire speed code.
|
|
*/
|
|
int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
|
|
int channel, int speed)
|
|
{
|
|
struct amdtp_stream *tmp;
|
|
|
|
list_for_each_entry(tmp, &d->streams, list) {
|
|
if (s == tmp)
|
|
return -EBUSY;
|
|
}
|
|
|
|
list_add(&s->list, &d->streams);
|
|
|
|
s->channel = channel;
|
|
s->speed = speed;
|
|
s->domain = d;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amdtp_domain_add_stream);
|
|
|
|
static int get_current_cycle_time(struct fw_card *fw_card, int *cur_cycle)
|
|
{
|
|
int generation;
|
|
int rcode;
|
|
__be32 reg;
|
|
u32 data;
|
|
|
|
// This is a request to local 1394 OHCI controller and expected to
|
|
// complete without any event waiting.
|
|
generation = fw_card->generation;
|
|
smp_rmb(); // node_id vs. generation.
|
|
rcode = fw_run_transaction(fw_card, TCODE_READ_QUADLET_REQUEST,
|
|
fw_card->node_id, generation, SCODE_100,
|
|
CSR_REGISTER_BASE + CSR_CYCLE_TIME,
|
|
®, sizeof(reg));
|
|
if (rcode != RCODE_COMPLETE)
|
|
return -EIO;
|
|
|
|
data = be32_to_cpu(reg);
|
|
*cur_cycle = data >> 12;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* amdtp_domain_start - start sending packets for isoc context in the domain.
|
|
* @d: the AMDTP domain.
|
|
* @ir_delay_cycle: the cycle delay to start all IR contexts.
|
|
*/
|
|
int amdtp_domain_start(struct amdtp_domain *d, unsigned int ir_delay_cycle)
|
|
{
|
|
static const struct {
|
|
unsigned int data_block;
|
|
unsigned int syt_offset;
|
|
} *entry, 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 events_per_buffer = d->events_per_buffer;
|
|
unsigned int events_per_period = d->events_per_period;
|
|
unsigned int idle_irq_interval;
|
|
unsigned int queue_size;
|
|
struct amdtp_stream *s;
|
|
int cycle;
|
|
int err;
|
|
|
|
// Select an IT context as IRQ target.
|
|
list_for_each_entry(s, &d->streams, list) {
|
|
if (s->direction == AMDTP_OUT_STREAM)
|
|
break;
|
|
}
|
|
if (!s)
|
|
return -ENXIO;
|
|
d->irq_target = s;
|
|
|
|
// This is a case that AMDTP streams in domain run just for MIDI
|
|
// substream. Use the number of events equivalent to 10 msec as
|
|
// interval of hardware IRQ.
|
|
if (events_per_period == 0)
|
|
events_per_period = amdtp_rate_table[d->irq_target->sfc] / 100;
|
|
if (events_per_buffer == 0)
|
|
events_per_buffer = events_per_period * 3;
|
|
|
|
queue_size = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_buffer,
|
|
amdtp_rate_table[d->irq_target->sfc]);
|
|
|
|
d->seq_descs = kcalloc(queue_size, sizeof(*d->seq_descs), GFP_KERNEL);
|
|
if (!d->seq_descs)
|
|
return -ENOMEM;
|
|
d->seq_size = queue_size;
|
|
d->seq_tail = 0;
|
|
|
|
entry = &initial_state[s->sfc];
|
|
d->data_block_state = entry->data_block;
|
|
d->syt_offset_state = entry->syt_offset;
|
|
d->last_syt_offset = TICKS_PER_CYCLE;
|
|
|
|
if (ir_delay_cycle > 0) {
|
|
struct fw_card *fw_card = fw_parent_device(s->unit)->card;
|
|
|
|
err = get_current_cycle_time(fw_card, &cycle);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
// No need to care overflow in cycle field because of enough
|
|
// width.
|
|
cycle += ir_delay_cycle;
|
|
|
|
// Round up to sec field.
|
|
if ((cycle & 0x00001fff) >= CYCLES_PER_SECOND) {
|
|
unsigned int sec;
|
|
|
|
// The sec field can overflow.
|
|
sec = (cycle & 0xffffe000) >> 13;
|
|
cycle = (++sec << 13) |
|
|
((cycle & 0x00001fff) / CYCLES_PER_SECOND);
|
|
}
|
|
|
|
// In OHCI 1394 specification, lower 2 bits are available for
|
|
// sec field.
|
|
cycle &= 0x00007fff;
|
|
} else {
|
|
cycle = -1;
|
|
}
|
|
|
|
list_for_each_entry(s, &d->streams, list) {
|
|
int cycle_match;
|
|
|
|
if (s->direction == AMDTP_IN_STREAM) {
|
|
cycle_match = cycle;
|
|
} else {
|
|
// IT context starts immediately.
|
|
cycle_match = -1;
|
|
s->ctx_data.rx.seq_index = 0;
|
|
}
|
|
|
|
if (s != d->irq_target) {
|
|
err = amdtp_stream_start(s, s->channel, s->speed,
|
|
cycle_match, queue_size, 0);
|
|
if (err < 0)
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
s = d->irq_target;
|
|
s->ctx_data.rx.events_per_period = events_per_period;
|
|
s->ctx_data.rx.event_count = 0;
|
|
s->ctx_data.rx.seq_index = 0;
|
|
|
|
idle_irq_interval = DIV_ROUND_UP(CYCLES_PER_SECOND * events_per_period,
|
|
amdtp_rate_table[d->irq_target->sfc]);
|
|
err = amdtp_stream_start(s, s->channel, s->speed, -1, queue_size,
|
|
idle_irq_interval);
|
|
if (err < 0)
|
|
goto error;
|
|
|
|
return 0;
|
|
error:
|
|
list_for_each_entry(s, &d->streams, list)
|
|
amdtp_stream_stop(s);
|
|
kfree(d->seq_descs);
|
|
d->seq_descs = NULL;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amdtp_domain_start);
|
|
|
|
/**
|
|
* amdtp_domain_stop - stop sending packets for isoc context in the same domain.
|
|
* @d: the AMDTP domain to which the isoc contexts belong.
|
|
*/
|
|
void amdtp_domain_stop(struct amdtp_domain *d)
|
|
{
|
|
struct amdtp_stream *s, *next;
|
|
|
|
if (d->irq_target)
|
|
amdtp_stream_stop(d->irq_target);
|
|
|
|
list_for_each_entry_safe(s, next, &d->streams, list) {
|
|
list_del(&s->list);
|
|
|
|
if (s != d->irq_target)
|
|
amdtp_stream_stop(s);
|
|
}
|
|
|
|
d->events_per_period = 0;
|
|
d->irq_target = NULL;
|
|
|
|
kfree(d->seq_descs);
|
|
d->seq_descs = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(amdtp_domain_stop);
|