[alsa-devel] [PATCH 05/39] firewire-lib: Add support for AMDTP in-stream and PCM capture
Takashi Sakamoto
o-takashi at sakamocchi.jp
Fri Feb 28 04:27:18 CET 2014
For capturing PCM, this commit adds the functionality to handle in-stream.
This is also applied for dual-wire mode.
Currently, capturing 32bit samples are supported.
Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
sound/firewire/amdtp.c | 218 +++++++++++++++++++++++++++++++++++++++++++++----
1 file changed, 201 insertions(+), 17 deletions(-)
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c
index ca79cb4..4ebfd67 100644
--- a/sound/firewire/amdtp.c
+++ b/sound/firewire/amdtp.c
@@ -39,6 +39,7 @@
* only "Clock-based rate control mode" is supported
*/
#define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3))
+#define AMDTP_FDF_NO_DATA 0xff
#define AMDTP_DBS_MASK 0x00ff0000
#define AMDTP_DBS_SHIFT 16
#define AMDTP_DBC_MASK 0x000000ff
@@ -47,6 +48,7 @@
#define INTERRUPT_INTERVAL 16
#define QUEUE_LENGTH 48
+#define IN_PACKET_HEADER_SIZE 4
#define OUT_PACKET_HEADER_SIZE 0
static void pcm_period_tasklet(unsigned long data);
@@ -179,6 +181,12 @@ static void amdtp_write_s16_dualwire(struct amdtp_stream *s,
static void amdtp_write_s32_dualwire(struct amdtp_stream *s,
struct snd_pcm_substream *pcm,
__be32 *buffer, unsigned int frames);
+static void amdtp_read_s32(struct amdtp_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames);
+static void amdtp_read_s32_dualwire(struct amdtp_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames);
/**
* amdtp_stream_set_pcm_format - set the PCM format
@@ -200,16 +208,26 @@ void amdtp_stream_set_pcm_format(struct amdtp_stream *s,
WARN_ON(1);
/* fall through */
case SNDRV_PCM_FORMAT_S16:
- if (s->dual_wire)
- s->transfer_samples = amdtp_write_s16_dualwire;
- else
- s->transfer_samples = amdtp_write_s16;
- break;
+ if (s->direction == AMDTP_OUT_STREAM) {
+ if (s->dual_wire)
+ s->transfer_samples = amdtp_write_s16_dualwire;
+ else
+ s->transfer_samples = amdtp_write_s16;
+ break;
+ }
+ WARN_ON(1);
+ /* fall through */
case SNDRV_PCM_FORMAT_S32:
- if (s->dual_wire)
- s->transfer_samples = amdtp_write_s32_dualwire;
- else
- s->transfer_samples = amdtp_write_s32;
+ if (s->direction == AMDTP_OUT_STREAM) {
+ if (s->dual_wire)
+ s->transfer_samples = amdtp_write_s32_dualwire;
+ else
+ s->transfer_samples = amdtp_write_s32;
+ } else if (s->dual_wire) {
+ s->transfer_samples = amdtp_read_s32_dualwire;
+ } else {
+ s->transfer_samples = amdtp_read_s32;
+ }
break;
}
}
@@ -420,6 +438,58 @@ static void amdtp_write_s16_dualwire(struct amdtp_stream *s,
}
}
+static void amdtp_read_s32(struct amdtp_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames)
+{
+ struct snd_pcm_runtime *runtime = pcm->runtime;
+ unsigned int remaining_frames, i, c;
+ u32 *dst;
+
+ dst = (void *)runtime->dma_area +
+ frames_to_bytes(runtime, s->pcm_buffer_pointer);
+ remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
+
+ for (i = 0; i < frames; ++i) {
+ for (c = 0; c < s->pcm_channels; ++c) {
+ *dst = be32_to_cpu(buffer[c]) << 8;
+ dst++;
+ }
+ buffer += s->data_block_quadlets;
+ if (--remaining_frames == 0)
+ dst = (void *)runtime->dma_area;
+ }
+}
+
+static void amdtp_read_s32_dualwire(struct amdtp_stream *s,
+ struct snd_pcm_substream *pcm,
+ __be32 *buffer, unsigned int frames)
+{
+ struct snd_pcm_runtime *runtime = pcm->runtime;
+ unsigned int channels, remaining_frames, i, c;
+ u32 *dst;
+
+ dst = (void *)runtime->dma_area +
+ frames_to_bytes(runtime, s->pcm_buffer_pointer);
+ remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
+ channels = s->pcm_channels / 2;
+
+ for (i = 0; i < frames; ++i) {
+ for (c = 0; c < channels; ++c) {
+ *dst = be32_to_cpu(buffer[c * 2]) << 8;
+ dst++;
+ }
+ buffer += 1;
+ for (c = 0; c < channels; ++c) {
+ *dst = be32_to_cpu(buffer[c * 2]) << 8;
+ dst++;
+ }
+ buffer += s->data_block_quadlets - 1;
+ if (--remaining_frames == 0)
+ dst = (void *)runtime->dma_area;
+ }
+}
+
static void amdtp_fill_pcm_silence(struct amdtp_stream *s,
__be32 *buffer, unsigned int frames)
{
@@ -505,6 +575,12 @@ static inline int queue_out_packet(struct amdtp_stream *s,
payload_length, skip);
}
+static inline int queue_in_packet(struct amdtp_stream *s)
+{
+ return queue_packet(s, IN_PACKET_HEADER_SIZE,
+ amdtp_stream_get_max_payload(s), false);
+}
+
static void handle_out_packet(struct amdtp_stream *s, unsigned int cycle)
{
__be32 *buffer;
@@ -552,6 +628,67 @@ static void handle_out_packet(struct amdtp_stream *s, unsigned int cycle)
update_pcm_pointers(s, pcm, data_blocks);
}
+static void handle_in_packet(struct amdtp_stream *s,
+ unsigned int payload_quadlets,
+ __be32 *buffer)
+{
+ u32 cip_header[2];
+ unsigned int data_block_quadlets, data_blocks, data_block_counter;
+ struct snd_pcm_substream *pcm;
+
+ cip_header[0] = be32_to_cpu(buffer[0]);
+ cip_header[1] = be32_to_cpu(buffer[1]);
+
+ /*
+ * This module supports 'Two-quadlet CIP header with SYT field'.
+ * For convinience, also check FMT field is AM824 or not.
+ */
+ if (((cip_header[0] & CIP_EOH_MASK) == CIP_EOH) ||
+ ((cip_header[1] & CIP_EOH_MASK) != CIP_EOH) ||
+ ((cip_header[1] & CIP_FMT_MASK) != CIP_FMT_AM)) {
+ dev_info_ratelimited(&s->unit->device,
+ "Invalid CIP header for AMDTP: %08X:%08X\n",
+ cip_header[0], cip_header[1]);
+ return;
+ }
+
+ /* ignore empty CIP packet or NO-DATA AMDTP packet */
+ if ((payload_quadlets < 3) ||
+ (((cip_header[1] & CIP_FDF_MASK) >> CIP_FDF_SFC_SHIFT) ==
+ AMDTP_FDF_NO_DATA))
+ return;
+
+ data_block_quadlets =
+ (cip_header[1] & AMDTP_DBS_MASK) >> AMDTP_DBS_SHIFT;
+ /* avoid division by zero */
+ if (data_block_quadlets == 0) {
+ dev_info_ratelimited(&s->unit->device,
+ "Detect invalid value in dbs field: %08X\n",
+ data_block_quadlets);
+ return;
+ }
+
+ data_blocks = (payload_quadlets - 2) / data_block_quadlets;
+ data_block_counter = cip_header[1] & AMDTP_DBC_MASK;
+
+ /* check packet continuity */
+ s->data_block_counter = (s->data_block_counter + data_blocks) & 0xff;
+ if (s->data_block_counter != data_block_counter) {
+ dev_info_ratelimited(&s->unit->device,
+ "Detect uncontinuity of CIP packets\n");
+ s->data_block_counter = data_block_counter;
+ return;
+ }
+
+ buffer += 2;
+
+ pcm = ACCESS_ONCE(s->pcm);
+ if (pcm) {
+ s->transfer_samples(s, pcm, buffer, data_blocks);
+ update_pcm_pointers(s, pcm, data_blocks);
+ }
+}
+
static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
size_t header_length, void *header,
void *private_data)
@@ -571,6 +708,35 @@ static void out_stream_callback(struct fw_iso_context *context, u32 cycle,
fw_iso_context_queue_flush(s->context);
}
+static void in_stream_callback(struct fw_iso_context *context, u32 cycle,
+ size_t header_length, void *header,
+ void *private_data)
+{
+ struct amdtp_stream *s = private_data;
+ unsigned int p, packets, data_quadlets;
+ __be32 *buffer, *headers = header;
+
+ /* The number of packets in buffer */
+ packets = header_length / IN_PACKET_HEADER_SIZE;
+
+ for (p = 0; p < packets; p++) {
+ buffer = s->buffer.packets[s->packet_index].buffer;
+
+ /* The number of quadlets in this packet */
+ data_quadlets =
+ (be32_to_cpu(headers[p]) >> ISO_DATA_LENGTH_SHIFT) / 4;
+ /* handle each packet data */
+ handle_in_packet(s, data_quadlets, buffer);
+
+ if (queue_in_packet(s) < 0) {
+ amdtp_stream_pcm_abort(s);
+ return;
+ }
+ }
+
+ fw_iso_context_queue_flush(s->context);
+}
+
/**
* amdtp_stream_start - start transferring packets
* @s: the AMDTP stream to start
@@ -595,7 +761,10 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
[CIP_SFC_88200] = { 0, 67 },
[CIP_SFC_176400] = { 0, 67 },
};
- int err;
+ unsigned int header_size;
+ enum dma_data_direction dir;
+ fw_iso_callback_t cb;
+ int type, err;
mutex_lock(&s->mutex);
@@ -609,16 +778,26 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
s->syt_offset_state = initial_state[s->sfc].syt_offset;
s->last_syt_offset = TICKS_PER_CYCLE;
+ /* initialize packet buffer */
+ if (s->direction == AMDTP_IN_STREAM) {
+ dir = DMA_FROM_DEVICE;
+ type = FW_ISO_CONTEXT_RECEIVE;
+ header_size = IN_PACKET_HEADER_SIZE;
+ cb = in_stream_callback;
+ } else {
+ dir = DMA_TO_DEVICE;
+ type = FW_ISO_CONTEXT_TRANSMIT;
+ header_size = OUT_PACKET_HEADER_SIZE;
+ cb = out_stream_callback;
+ }
err = iso_packets_buffer_init(&s->buffer, s->unit, QUEUE_LENGTH,
- amdtp_stream_get_max_payload(s),
- DMA_TO_DEVICE);
+ amdtp_stream_get_max_payload(s), dir);
if (err < 0)
goto err_unlock;
s->context = fw_iso_context_create(fw_parent_device(s->unit)->card,
- FW_ISO_CONTEXT_TRANSMIT,
- channel, speed, 0,
- out_stream_callback, s);
+ type, channel, speed, header_size,
+ cb, s);
if (IS_ERR(s->context)) {
err = PTR_ERR(s->context);
if (err == -EBUSY)
@@ -631,13 +810,18 @@ int amdtp_stream_start(struct amdtp_stream *s, int channel, int speed)
s->packet_index = 0;
do {
- err = queue_out_packet(s, 0, true);
+ if (s->direction == AMDTP_IN_STREAM)
+ err = queue_in_packet(s);
+ else
+ err = queue_out_packet(s, 0, true);
if (err < 0)
goto err_context;
} while (s->packet_index > 0);
+ /* NOTE: TAG1 matches CIP. This just affects in stream */
s->data_block_counter = 0;
- err = fw_iso_context_start(s->context, -1, 0, 0);
+ err = fw_iso_context_start(s->context, -1, 0,
+ FW_ISO_CONTEXT_MATCH_TAG1);
if (err < 0)
goto err_context;
--
1.8.3.2
More information about the Alsa-devel
mailing list