diff options
Diffstat (limited to '')
| -rw-r--r-- | sound/firewire/digi00x/digi00x-stream.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/sound/firewire/digi00x/digi00x-stream.c b/sound/firewire/digi00x/digi00x-stream.c new file mode 100644 index 000000000..295163bb8 --- /dev/null +++ b/sound/firewire/digi00x/digi00x-stream.c @@ -0,0 +1,459 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * digi00x-stream.c - a part of driver for Digidesign Digi 002/003 family + * + * Copyright (c) 2014-2015 Takashi Sakamoto + */ + +#include "digi00x.h" + +#define READY_TIMEOUT_MS 200 + +const unsigned int snd_dg00x_stream_rates[SND_DG00X_RATE_COUNT] = { + [SND_DG00X_RATE_44100] = 44100, + [SND_DG00X_RATE_48000] = 48000, + [SND_DG00X_RATE_88200] = 88200, + [SND_DG00X_RATE_96000] = 96000, +}; + +/* Multi Bit Linear Audio data channels for each sampling transfer frequency. */ +const unsigned int +snd_dg00x_stream_pcm_channels[SND_DG00X_RATE_COUNT] = { + /* Analog/ADAT/SPDIF */ + [SND_DG00X_RATE_44100] = (8 + 8 + 2), + [SND_DG00X_RATE_48000] = (8 + 8 + 2), + /* Analog/SPDIF */ + [SND_DG00X_RATE_88200] = (8 + 2), + [SND_DG00X_RATE_96000] = (8 + 2), +}; + +int snd_dg00x_stream_get_local_rate(struct snd_dg00x *dg00x, unsigned int *rate) +{ + u32 data; + __be32 reg; + int err; + + err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_LOCAL_RATE, + ®, sizeof(reg), 0); + if (err < 0) + return err; + + data = be32_to_cpu(reg) & 0x0f; + if (data < ARRAY_SIZE(snd_dg00x_stream_rates)) + *rate = snd_dg00x_stream_rates[data]; + else + err = -EIO; + + return err; +} + +int snd_dg00x_stream_set_local_rate(struct snd_dg00x *dg00x, unsigned int rate) +{ + __be32 reg; + unsigned int i; + + for (i = 0; i < ARRAY_SIZE(snd_dg00x_stream_rates); i++) { + if (rate == snd_dg00x_stream_rates[i]) + break; + } + if (i == ARRAY_SIZE(snd_dg00x_stream_rates)) + return -EINVAL; + + reg = cpu_to_be32(i); + return snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_LOCAL_RATE, + ®, sizeof(reg), 0); +} + +int snd_dg00x_stream_get_clock(struct snd_dg00x *dg00x, + enum snd_dg00x_clock *clock) +{ + __be32 reg; + int err; + + err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_CLOCK_SOURCE, + ®, sizeof(reg), 0); + if (err < 0) + return err; + + *clock = be32_to_cpu(reg) & 0x0f; + if (*clock >= SND_DG00X_CLOCK_COUNT) + err = -EIO; + + return err; +} + +int snd_dg00x_stream_check_external_clock(struct snd_dg00x *dg00x, bool *detect) +{ + __be32 reg; + int err; + + err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_DETECT_EXTERNAL, + ®, sizeof(reg), 0); + if (err >= 0) + *detect = be32_to_cpu(reg) > 0; + + return err; +} + +int snd_dg00x_stream_get_external_rate(struct snd_dg00x *dg00x, + unsigned int *rate) +{ + u32 data; + __be32 reg; + int err; + + err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_EXTERNAL_RATE, + ®, sizeof(reg), 0); + if (err < 0) + return err; + + data = be32_to_cpu(reg) & 0x0f; + if (data < ARRAY_SIZE(snd_dg00x_stream_rates)) + *rate = snd_dg00x_stream_rates[data]; + /* This means desync. */ + else + err = -EBUSY; + + return err; +} + +static void finish_session(struct snd_dg00x *dg00x) +{ + __be32 data; + + data = cpu_to_be32(0x00000003); + snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_STREAMING_SET, + &data, sizeof(data), 0); + + // Unregister isochronous channels for both direction. + data = 0; + snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_ISOC_CHANNELS, + &data, sizeof(data), 0); + + // Just after finishing the session, the device may lost transmitting + // functionality for a short time. + msleep(50); +} + +static int begin_session(struct snd_dg00x *dg00x) +{ + __be32 data; + u32 curr; + int err; + + // Register isochronous channels for both direction. + data = cpu_to_be32((dg00x->tx_resources.channel << 16) | + dg00x->rx_resources.channel); + err = snd_fw_transaction(dg00x->unit, TCODE_WRITE_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_ISOC_CHANNELS, + &data, sizeof(data), 0); + if (err < 0) + return err; + + err = snd_fw_transaction(dg00x->unit, TCODE_READ_QUADLET_REQUEST, + DG00X_ADDR_BASE + DG00X_OFFSET_STREAMING_STATE, + &data, sizeof(data), 0); + if (err < 0) + return err; + curr = be32_to_cpu(data); + + if (curr == 0) + curr = 2; + + curr--; + while (curr > 0) { + data = cpu_to_be32(curr); + err = snd_fw_transaction(dg00x->unit, + TCODE_WRITE_QUADLET_REQUEST, + DG00X_ADDR_BASE + + DG00X_OFFSET_STREAMING_SET, + &data, sizeof(data), 0); + if (err < 0) + break; + + msleep(20); + curr--; + } + + return err; +} + +static int keep_resources(struct snd_dg00x *dg00x, struct amdtp_stream *stream, + unsigned int rate) +{ + struct fw_iso_resources *resources; + int i; + int err; + + // Check sampling rate. + for (i = 0; i < SND_DG00X_RATE_COUNT; i++) { + if (snd_dg00x_stream_rates[i] == rate) + break; + } + if (i == SND_DG00X_RATE_COUNT) + return -EINVAL; + + if (stream == &dg00x->tx_stream) + resources = &dg00x->tx_resources; + else + resources = &dg00x->rx_resources; + + err = amdtp_dot_set_parameters(stream, rate, + snd_dg00x_stream_pcm_channels[i]); + if (err < 0) + return err; + + return fw_iso_resources_allocate(resources, + amdtp_stream_get_max_payload(stream), + fw_parent_device(dg00x->unit)->max_speed); +} + +static int init_stream(struct snd_dg00x *dg00x, struct amdtp_stream *s) +{ + struct fw_iso_resources *resources; + enum amdtp_stream_direction dir; + int err; + + if (s == &dg00x->tx_stream) { + resources = &dg00x->tx_resources; + dir = AMDTP_IN_STREAM; + } else { + resources = &dg00x->rx_resources; + dir = AMDTP_OUT_STREAM; + } + + err = fw_iso_resources_init(resources, dg00x->unit); + if (err < 0) + return err; + + err = amdtp_dot_init(s, dg00x->unit, dir); + if (err < 0) + fw_iso_resources_destroy(resources); + + return err; +} + +static void destroy_stream(struct snd_dg00x *dg00x, struct amdtp_stream *s) +{ + amdtp_stream_destroy(s); + + if (s == &dg00x->tx_stream) + fw_iso_resources_destroy(&dg00x->tx_resources); + else + fw_iso_resources_destroy(&dg00x->rx_resources); +} + +int snd_dg00x_stream_init_duplex(struct snd_dg00x *dg00x) +{ + int err; + + err = init_stream(dg00x, &dg00x->rx_stream); + if (err < 0) + return err; + + err = init_stream(dg00x, &dg00x->tx_stream); + if (err < 0) { + destroy_stream(dg00x, &dg00x->rx_stream); + return err; + } + + err = amdtp_domain_init(&dg00x->domain); + if (err < 0) { + destroy_stream(dg00x, &dg00x->rx_stream); + destroy_stream(dg00x, &dg00x->tx_stream); + } + + return err; +} + +/* + * This function should be called before starting streams or after stopping + * streams. + */ +void snd_dg00x_stream_destroy_duplex(struct snd_dg00x *dg00x) +{ + amdtp_domain_destroy(&dg00x->domain); + + destroy_stream(dg00x, &dg00x->rx_stream); + destroy_stream(dg00x, &dg00x->tx_stream); +} + +int snd_dg00x_stream_reserve_duplex(struct snd_dg00x *dg00x, unsigned int rate, + unsigned int frames_per_period, + unsigned int frames_per_buffer) +{ + unsigned int curr_rate; + int err; + + err = snd_dg00x_stream_get_local_rate(dg00x, &curr_rate); + if (err < 0) + return err; + if (rate == 0) + rate = curr_rate; + + if (dg00x->substreams_counter == 0 || curr_rate != rate) { + amdtp_domain_stop(&dg00x->domain); + + finish_session(dg00x); + + fw_iso_resources_free(&dg00x->tx_resources); + fw_iso_resources_free(&dg00x->rx_resources); + + err = snd_dg00x_stream_set_local_rate(dg00x, rate); + if (err < 0) + return err; + + err = keep_resources(dg00x, &dg00x->rx_stream, rate); + if (err < 0) + return err; + + err = keep_resources(dg00x, &dg00x->tx_stream, rate); + if (err < 0) { + fw_iso_resources_free(&dg00x->rx_resources); + return err; + } + + err = amdtp_domain_set_events_per_period(&dg00x->domain, + frames_per_period, frames_per_buffer); + if (err < 0) { + fw_iso_resources_free(&dg00x->rx_resources); + fw_iso_resources_free(&dg00x->tx_resources); + return err; + } + } + + return 0; +} + +int snd_dg00x_stream_start_duplex(struct snd_dg00x *dg00x) +{ + unsigned int generation = dg00x->rx_resources.generation; + int err = 0; + + if (dg00x->substreams_counter == 0) + return 0; + + if (amdtp_streaming_error(&dg00x->tx_stream) || + amdtp_streaming_error(&dg00x->rx_stream)) { + amdtp_domain_stop(&dg00x->domain); + finish_session(dg00x); + } + + if (generation != fw_parent_device(dg00x->unit)->card->generation) { + err = fw_iso_resources_update(&dg00x->tx_resources); + if (err < 0) + goto error; + + err = fw_iso_resources_update(&dg00x->rx_resources); + if (err < 0) + goto error; + } + + /* + * No packets are transmitted without receiving packets, reagardless of + * which source of clock is used. + */ + if (!amdtp_stream_running(&dg00x->rx_stream)) { + int spd = fw_parent_device(dg00x->unit)->max_speed; + + err = begin_session(dg00x); + if (err < 0) + goto error; + + err = amdtp_domain_add_stream(&dg00x->domain, &dg00x->rx_stream, + dg00x->rx_resources.channel, spd); + if (err < 0) + goto error; + + err = amdtp_domain_add_stream(&dg00x->domain, &dg00x->tx_stream, + dg00x->tx_resources.channel, spd); + if (err < 0) + goto error; + + // NOTE: The device doesn't start packet transmission till receiving any packet. + // It ignores presentation time expressed by the value of syt field of CIP header + // in received packets. The sequence of the number of data blocks per packet is + // important for media clock recovery. + err = amdtp_domain_start(&dg00x->domain, 0, true, true); + if (err < 0) + goto error; + + if (!amdtp_domain_wait_ready(&dg00x->domain, READY_TIMEOUT_MS)) { + err = -ETIMEDOUT; + goto error; + } + } + + return 0; +error: + amdtp_domain_stop(&dg00x->domain); + finish_session(dg00x); + + return err; +} + +void snd_dg00x_stream_stop_duplex(struct snd_dg00x *dg00x) +{ + if (dg00x->substreams_counter == 0) { + amdtp_domain_stop(&dg00x->domain); + finish_session(dg00x); + + fw_iso_resources_free(&dg00x->tx_resources); + fw_iso_resources_free(&dg00x->rx_resources); + } +} + +void snd_dg00x_stream_update_duplex(struct snd_dg00x *dg00x) +{ + fw_iso_resources_update(&dg00x->tx_resources); + fw_iso_resources_update(&dg00x->rx_resources); + + amdtp_stream_update(&dg00x->tx_stream); + amdtp_stream_update(&dg00x->rx_stream); +} + +void snd_dg00x_stream_lock_changed(struct snd_dg00x *dg00x) +{ + dg00x->dev_lock_changed = true; + wake_up(&dg00x->hwdep_wait); +} + +int snd_dg00x_stream_lock_try(struct snd_dg00x *dg00x) +{ + int err; + + spin_lock_irq(&dg00x->lock); + + /* user land lock this */ + if (dg00x->dev_lock_count < 0) { + err = -EBUSY; + goto end; + } + + /* this is the first time */ + if (dg00x->dev_lock_count++ == 0) + snd_dg00x_stream_lock_changed(dg00x); + err = 0; +end: + spin_unlock_irq(&dg00x->lock); + return err; +} + +void snd_dg00x_stream_lock_release(struct snd_dg00x *dg00x) +{ + spin_lock_irq(&dg00x->lock); + + if (WARN_ON(dg00x->dev_lock_count <= 0)) + goto end; + if (--dg00x->dev_lock_count == 0) + snd_dg00x_stream_lock_changed(dg00x); +end: + spin_unlock_irq(&dg00x->lock); +} |