diff options
Diffstat (limited to 'ANDROID_3.4.5/sound/firewire/amdtp.c')
| -rw-r--r-- | ANDROID_3.4.5/sound/firewire/amdtp.c | 563 |
1 files changed, 0 insertions, 563 deletions
diff --git a/ANDROID_3.4.5/sound/firewire/amdtp.c b/ANDROID_3.4.5/sound/firewire/amdtp.c deleted file mode 100644 index 87657dd7..00000000 --- a/ANDROID_3.4.5/sound/firewire/amdtp.c +++ /dev/null @@ -1,563 +0,0 @@ -/* - * Audio and Music Data Transmission Protocol (IEC 61883-6) streams - * with Common Isochronous Packet (IEC 61883-1) headers - * - * Copyright (c) Clemens Ladisch <clemens@ladisch.de> - * Licensed under the terms of the GNU General Public License, version 2. - */ - -#include <linux/device.h> -#include <linux/err.h> -#include <linux/firewire.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <sound/pcm.h> -#include "amdtp.h" - -#define TICKS_PER_CYCLE 3072 -#define CYCLES_PER_SECOND 8000 -#define TICKS_PER_SECOND (TICKS_PER_CYCLE * CYCLES_PER_SECOND) - -#define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ - -#define TAG_CIP 1 - -#define CIP_EOH (1u << 31) -#define CIP_FMT_AM (0x10 << 24) -#define AMDTP_FDF_AM824 (0 << 19) -#define AMDTP_FDF_SFC_SHIFT 16 - -/* TODO: make these configurable */ -#define INTERRUPT_INTERVAL 16 -#define QUEUE_LENGTH 48 - -/** - * amdtp_out_stream_init - initialize an AMDTP output stream structure - * @s: the AMDTP output stream to initialize - * @unit: the target of the stream - * @flags: the packet transmission method to use - */ -int amdtp_out_stream_init(struct amdtp_out_stream *s, struct fw_unit *unit, - enum cip_out_flags flags) -{ - if (flags != CIP_NONBLOCKING) - return -EINVAL; - - s->unit = fw_unit_get(unit); - s->flags = flags; - s->context = ERR_PTR(-1); - mutex_init(&s->mutex); - s->packet_index = 0; - - return 0; -} -EXPORT_SYMBOL(amdtp_out_stream_init); - -/** - * amdtp_out_stream_destroy - free stream resources - * @s: the AMDTP output stream to destroy - */ -void amdtp_out_stream_destroy(struct amdtp_out_stream *s) -{ - WARN_ON(!IS_ERR(s->context)); - mutex_destroy(&s->mutex); - fw_unit_put(s->unit); -} -EXPORT_SYMBOL(amdtp_out_stream_destroy); - -/** - * amdtp_out_stream_set_rate - set the sample rate - * @s: the AMDTP output stream to configure - * @rate: the sample rate - * - * The sample rate must be set before the stream is started, and must not be - * changed while the stream is running. - */ -void amdtp_out_stream_set_rate(struct amdtp_out_stream *s, unsigned int rate) -{ - static const struct { - unsigned int rate; - unsigned int syt_interval; - } rate_info[] = { - [CIP_SFC_32000] = { 32000, 8, }, - [CIP_SFC_44100] = { 44100, 8, }, - [CIP_SFC_48000] = { 48000, 8, }, - [CIP_SFC_88200] = { 88200, 16, }, - [CIP_SFC_96000] = { 96000, 16, }, - [CIP_SFC_176400] = { 176400, 32, }, - [CIP_SFC_192000] = { 192000, 32, }, - }; - unsigned int sfc; - - if (WARN_ON(!IS_ERR(s->context))) - return; - - for (sfc = 0; sfc < ARRAY_SIZE(rate_info); ++sfc) - if (rate_info[sfc].rate == rate) { - s->sfc = sfc; - s->syt_interval = rate_info[sfc].syt_interval; - return; - } - WARN_ON(1); -} -EXPORT_SYMBOL(amdtp_out_stream_set_rate); - -/** - * amdtp_out_stream_get_max_payload - get the stream's packet size - * @s: the AMDTP output stream - * - * This function must not be called before the stream has been configured - * with amdtp_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and - * amdtp_out_stream_set_midi(). - */ -unsigned int amdtp_out_stream_get_max_payload(struct amdtp_out_stream *s) -{ - static const unsigned int max_data_blocks[] = { - [CIP_SFC_32000] = 4, - [CIP_SFC_44100] = 6, - [CIP_SFC_48000] = 6, - [CIP_SFC_88200] = 12, - [CIP_SFC_96000] = 12, - [CIP_SFC_176400] = 23, - [CIP_SFC_192000] = 24, - }; - - s->data_block_quadlets = s->pcm_channels; - s->data_block_quadlets += DIV_ROUND_UP(s->midi_ports, 8); - - return 8 + max_data_blocks[s->sfc] * 4 * s->data_block_quadlets; -} -EXPORT_SYMBOL(amdtp_out_stream_get_max_payload); - -static void amdtp_write_s16(struct amdtp_out_stream *s, - struct snd_pcm_substream *pcm, - __be32 *buffer, unsigned int frames); -static void amdtp_write_s32(struct amdtp_out_stream *s, - struct snd_pcm_substream *pcm, - __be32 *buffer, unsigned int frames); - -/** - * amdtp_out_stream_set_pcm_format - set the PCM format - * @s: the AMDTP output stream to configure - * @format: the format of the ALSA PCM device - * - * The sample format must be set before the stream is started, and must not be - * changed while the stream is running. - */ -void amdtp_out_stream_set_pcm_format(struct amdtp_out_stream *s, - snd_pcm_format_t format) -{ - if (WARN_ON(!IS_ERR(s->context))) - return; - - switch (format) { - default: - WARN_ON(1); - /* fall through */ - case SNDRV_PCM_FORMAT_S16: - s->transfer_samples = amdtp_write_s16; - break; - case SNDRV_PCM_FORMAT_S32: - s->transfer_samples = amdtp_write_s32; - break; - } -} -EXPORT_SYMBOL(amdtp_out_stream_set_pcm_format); - -static unsigned int calculate_data_blocks(struct amdtp_out_stream *s) -{ - unsigned int phase, data_blocks; - - if (!cip_sfc_is_base_44100(s->sfc)) { - /* Sample_rate / 8000 is an integer, and precomputed. */ - data_blocks = s->data_block_state; - } else { - phase = s->data_block_state; - - /* - * This calculates the number of data blocks per packet so that - * 1) the overall rate is correct and exactly synchronized to - * the bus clock, and - * 2) packets with a rounded-up number of blocks occur as early - * as possible in the sequence (to prevent underruns of the - * device's buffer). - */ - if (s->sfc == CIP_SFC_44100) - /* 6 6 5 6 5 6 5 ... */ - data_blocks = 5 + ((phase & 1) ^ - (phase == 0 || phase >= 40)); - else - /* 12 11 11 11 11 ... or 23 22 22 22 22 ... */ - data_blocks = 11 * (s->sfc >> 1) + (phase == 0); - if (++phase >= (80 >> (s->sfc >> 1))) - phase = 0; - s->data_block_state = phase; - } - - return data_blocks; -} - -static unsigned int calculate_syt(struct amdtp_out_stream *s, - unsigned int cycle) -{ - unsigned int syt_offset, phase, index, syt; - - if (s->last_syt_offset < TICKS_PER_CYCLE) { - if (!cip_sfc_is_base_44100(s->sfc)) - syt_offset = s->last_syt_offset + s->syt_offset_state; - else { - /* - * The time, in ticks, of the n'th SYT_INTERVAL sample is: - * n * SYT_INTERVAL * 24576000 / sample_rate - * Modulo TICKS_PER_CYCLE, the difference between successive - * elements is about 1386.23. Rounding the results of this - * formula to the SYT precision results in a sequence of - * differences that begins with: - * 1386 1386 1387 1386 1386 1386 1387 1386 1386 1386 1387 ... - * This code generates _exactly_ the same sequence. - */ - phase = s->syt_offset_state; - index = phase % 13; - syt_offset = s->last_syt_offset; - syt_offset += 1386 + ((index && !(index & 3)) || - phase == 146); - if (++phase >= 147) - phase = 0; - s->syt_offset_state = phase; - } - } else - syt_offset = s->last_syt_offset - TICKS_PER_CYCLE; - s->last_syt_offset = syt_offset; - - if (syt_offset < TICKS_PER_CYCLE) { - syt_offset += TRANSFER_DELAY_TICKS - TICKS_PER_CYCLE; - syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; - syt += syt_offset % TICKS_PER_CYCLE; - - return syt & 0xffff; - } else { - return 0xffff; /* no info */ - } -} - -static void amdtp_write_s32(struct amdtp_out_stream *s, - struct snd_pcm_substream *pcm, - __be32 *buffer, unsigned int frames) -{ - struct snd_pcm_runtime *runtime = pcm->runtime; - unsigned int channels, remaining_frames, frame_step, i, c; - const u32 *src; - - channels = s->pcm_channels; - src = (void *)runtime->dma_area + - s->pcm_buffer_pointer * (runtime->frame_bits / 8); - remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; - frame_step = s->data_block_quadlets - channels; - - for (i = 0; i < frames; ++i) { - for (c = 0; c < channels; ++c) { - *buffer = cpu_to_be32((*src >> 8) | 0x40000000); - src++; - buffer++; - } - buffer += frame_step; - if (--remaining_frames == 0) - src = (void *)runtime->dma_area; - } -} - -static void amdtp_write_s16(struct amdtp_out_stream *s, - struct snd_pcm_substream *pcm, - __be32 *buffer, unsigned int frames) -{ - struct snd_pcm_runtime *runtime = pcm->runtime; - unsigned int channels, remaining_frames, frame_step, i, c; - const u16 *src; - - channels = s->pcm_channels; - src = (void *)runtime->dma_area + - s->pcm_buffer_pointer * (runtime->frame_bits / 8); - remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer; - frame_step = s->data_block_quadlets - channels; - - for (i = 0; i < frames; ++i) { - for (c = 0; c < channels; ++c) { - *buffer = cpu_to_be32((*src << 8) | 0x40000000); - src++; - buffer++; - } - buffer += frame_step; - if (--remaining_frames == 0) - src = (void *)runtime->dma_area; - } -} - -static void amdtp_fill_pcm_silence(struct amdtp_out_stream *s, - __be32 *buffer, unsigned int frames) -{ - unsigned int i, c; - - for (i = 0; i < frames; ++i) { - for (c = 0; c < s->pcm_channels; ++c) - buffer[c] = cpu_to_be32(0x40000000); - buffer += s->data_block_quadlets; - } -} - -static void amdtp_fill_midi(struct amdtp_out_stream *s, - __be32 *buffer, unsigned int frames) -{ - unsigned int i; - - for (i = 0; i < frames; ++i) - buffer[s->pcm_channels + i * s->data_block_quadlets] = - cpu_to_be32(0x80000000); -} - -static void queue_out_packet(struct amdtp_out_stream *s, unsigned int cycle) -{ - __be32 *buffer; - unsigned int index, data_blocks, syt, ptr; - struct snd_pcm_substream *pcm; - struct fw_iso_packet packet; - int err; - - if (s->packet_index < 0) - return; - index = s->packet_index; - - data_blocks = calculate_data_blocks(s); - syt = calculate_syt(s, cycle); - - buffer = s->buffer.packets[index].buffer; - buffer[0] = cpu_to_be32(ACCESS_ONCE(s->source_node_id_field) | - (s->data_block_quadlets << 16) | - s->data_block_counter); - buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | - (s->sfc << AMDTP_FDF_SFC_SHIFT) | syt); - buffer += 2; - - pcm = ACCESS_ONCE(s->pcm); - if (pcm) - s->transfer_samples(s, pcm, buffer, data_blocks); - else - amdtp_fill_pcm_silence(s, buffer, data_blocks); - if (s->midi_ports) - amdtp_fill_midi(s, buffer, data_blocks); - - s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff; - - packet.payload_length = 8 + data_blocks * 4 * s->data_block_quadlets; - packet.interrupt = IS_ALIGNED(index + 1, INTERRUPT_INTERVAL); - packet.skip = 0; - packet.tag = TAG_CIP; - packet.sy = 0; - packet.header_length = 0; - - err = fw_iso_context_queue(s->context, &packet, &s->buffer.iso_buffer, - s->buffer.packets[index].offset); - if (err < 0) { - dev_err(&s->unit->device, "queueing error: %d\n", err); - s->packet_index = -1; - amdtp_out_stream_pcm_abort(s); - return; - } - - if (++index >= QUEUE_LENGTH) - index = 0; - s->packet_index = index; - - if (pcm) { - ptr = s->pcm_buffer_pointer + data_blocks; - if (ptr >= pcm->runtime->buffer_size) - ptr -= pcm->runtime->buffer_size; - ACCESS_ONCE(s->pcm_buffer_pointer) = ptr; - - s->pcm_period_pointer += data_blocks; - if (s->pcm_period_pointer >= pcm->runtime->period_size) { - s->pcm_period_pointer -= pcm->runtime->period_size; - snd_pcm_period_elapsed(pcm); - } - } -} - -static void out_packet_callback(struct fw_iso_context *context, u32 cycle, - size_t header_length, void *header, void *data) -{ - struct amdtp_out_stream *s = data; - unsigned int i, packets = header_length / 4; - - /* - * Compute the cycle of the last queued packet. - * (We need only the four lowest bits for the SYT, so we can ignore - * that bits 0-11 must wrap around at 3072.) - */ - cycle += QUEUE_LENGTH - packets; - - for (i = 0; i < packets; ++i) - queue_out_packet(s, ++cycle); - fw_iso_context_queue_flush(s->context); -} - -static int queue_initial_skip_packets(struct amdtp_out_stream *s) -{ - struct fw_iso_packet skip_packet = { - .skip = 1, - }; - unsigned int i; - int err; - - for (i = 0; i < QUEUE_LENGTH; ++i) { - skip_packet.interrupt = IS_ALIGNED(s->packet_index + 1, - INTERRUPT_INTERVAL); - err = fw_iso_context_queue(s->context, &skip_packet, NULL, 0); - if (err < 0) - return err; - if (++s->packet_index >= QUEUE_LENGTH) - s->packet_index = 0; - } - - return 0; -} - -/** - * amdtp_out_stream_start - start sending packets - * @s: the AMDTP output 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_out_stream_set_hw_params(), amdtp_out_stream_set_pcm(), and - * amdtp_out_stream_set_midi(); and it must be started before any - * PCM or MIDI device can be started. - */ -int amdtp_out_stream_start(struct amdtp_out_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 }, - }; - int err; - - mutex_lock(&s->mutex); - - if (WARN_ON(!IS_ERR(s->context) || - (!s->pcm_channels && !s->midi_ports))) { - err = -EBADFD; - goto err_unlock; - } - - 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; - - err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH, - amdtp_out_stream_get_max_payload(s), - DMA_TO_DEVICE); - if (err < 0) - goto err_unlock; - - s->context = fw_iso_context_create(fw_parent_device(s->unit)->card, - FW_ISO_CONTEXT_TRANSMIT, - channel, speed, 0, - out_packet_callback, s); - if (IS_ERR(s->context)) { - err = PTR_ERR(s->context); - if (err == -EBUSY) - dev_err(&s->unit->device, - "no free output stream on this controller\n"); - goto err_buffer; - } - - amdtp_out_stream_update(s); - - s->packet_index = 0; - s->data_block_counter = 0; - err = queue_initial_skip_packets(s); - if (err < 0) - goto err_context; - - err = fw_iso_context_start(s->context, -1, 0, 0); - 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_out_stream_start); - -/** - * amdtp_out_stream_update - update the stream after a bus reset - * @s: the AMDTP output stream - */ -void amdtp_out_stream_update(struct amdtp_out_stream *s) -{ - ACCESS_ONCE(s->source_node_id_field) = - (fw_parent_device(s->unit)->card->node_id & 0x3f) << 24; -} -EXPORT_SYMBOL(amdtp_out_stream_update); - -/** - * amdtp_out_stream_stop - stop sending packets - * @s: the AMDTP output stream to stop - * - * All PCM and MIDI devices of the stream must be stopped before the stream - * itself can be stopped. - */ -void amdtp_out_stream_stop(struct amdtp_out_stream *s) -{ - mutex_lock(&s->mutex); - - if (IS_ERR(s->context)) { - mutex_unlock(&s->mutex); - return; - } - - 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); - - mutex_unlock(&s->mutex); -} -EXPORT_SYMBOL(amdtp_out_stream_stop); - -/** - * amdtp_out_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_out_stream_pcm_abort(struct amdtp_out_stream *s) -{ - struct snd_pcm_substream *pcm; - - pcm = ACCESS_ONCE(s->pcm); - if (pcm) { - snd_pcm_stream_lock_irq(pcm); - if (snd_pcm_running(pcm)) - snd_pcm_stop(pcm, SNDRV_PCM_STATE_XRUN); - snd_pcm_stream_unlock_irq(pcm); - } -} -EXPORT_SYMBOL(amdtp_out_stream_pcm_abort); |