diff options
| author | Takashi Sakamoto <o-takashi@sakamocchi.jp> | 2014-04-25 13:44:43 (GMT) |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2014-05-26 12:11:22 (GMT) |
| commit | b445db440cf77ead4312b1918545abe06f6ee75b (patch) | |
| tree | 97e9dc443cec2784c956f3a16e548c72c43cbe25 /sound/firewire/amdtp.c | |
| parent | be4a28940a997311162b487c9b398eec435d9661 (diff) | |
| download | linux-b445db440cf77ead4312b1918545abe06f6ee75b.tar.xz | |
ALSA: firewire-lib: Add macros instead of fixed value for AMDTP
This patch adds some macros instead of fixed value for AMDTP according to
IEC 61883-1/6. These macros will also be used by followed patches.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/firewire/amdtp.c')
| -rw-r--r-- | sound/firewire/amdtp.c | 30 |
1 files changed, 23 insertions, 7 deletions
diff --git a/sound/firewire/amdtp.c b/sound/firewire/amdtp.c index 16fe858..38013f9 100644 --- a/sound/firewire/amdtp.c +++ b/sound/firewire/amdtp.c @@ -20,12 +20,28 @@ #define TRANSFER_DELAY_TICKS 0x2e00 /* 479.17 µs */ +/* isochronous header parameters */ +#define ISO_DATA_LENGTH_SHIFT 16 #define TAG_CIP 1 +/* common isochronous packet header parameters */ #define CIP_EOH (1u << 31) +#define CIP_EOH_MASK 0x80000000 #define CIP_FMT_AM (0x10 << 24) -#define AMDTP_FDF_AM824 (0 << 19) -#define AMDTP_FDF_SFC_SHIFT 16 +#define CIP_FMT_MASK 0x3f000000 +#define CIP_SYT_MASK 0x0000ffff +#define CIP_SYT_NO_INFO 0xffff +#define CIP_FDF_MASK 0x00ff0000 +#define CIP_FDF_SFC_SHIFT 16 + +/* + * Audio and Music transfer protocol specific parameters + * only "Clock-based rate control mode" is supported + */ +#define AMDTP_FDF_AM824 (0 << (CIP_FDF_SFC_SHIFT + 3)) +#define AMDTP_DBS_MASK 0x00ff0000 +#define AMDTP_DBS_SHIFT 16 +#define AMDTP_DBC_MASK 0x000000ff /* TODO: make these configurable */ #define INTERRUPT_INTERVAL 16 @@ -280,9 +296,9 @@ static unsigned int calculate_syt(struct amdtp_stream *s, syt = (cycle + syt_offset / TICKS_PER_CYCLE) << 12; syt += syt_offset % TICKS_PER_CYCLE; - return syt & 0xffff; + return syt & CIP_SYT_MASK; } else { - return 0xffff; /* no info */ + return CIP_SYT_NO_INFO; } } @@ -438,17 +454,17 @@ static void queue_out_packet(struct amdtp_stream *s, unsigned int cycle) syt = calculate_syt(s, cycle); if (!(s->flags & CIP_BLOCKING)) data_blocks = calculate_data_blocks(s); - else if (syt != 0xffff) + else if (syt != CIP_SYT_NO_INFO) data_blocks = s->syt_interval; else data_blocks = 0; 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_quadlets << AMDTP_DBS_SHIFT) | s->data_block_counter); buffer[1] = cpu_to_be32(CIP_EOH | CIP_FMT_AM | AMDTP_FDF_AM824 | - (s->sfc << AMDTP_FDF_SFC_SHIFT) | syt); + (s->sfc << CIP_FDF_SFC_SHIFT) | syt); buffer += 2; pcm = ACCESS_ONCE(s->pcm); |