diff options
Diffstat (limited to 'sound/firewire/fireface/ff-protocol-ff800.c')
| -rw-r--r-- | sound/firewire/fireface/ff-protocol-ff800.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/sound/firewire/fireface/ff-protocol-ff800.c b/sound/firewire/fireface/ff-protocol-ff800.c new file mode 100644 index 000000000000..2acbf6039770 --- /dev/null +++ b/sound/firewire/fireface/ff-protocol-ff800.c @@ -0,0 +1,143 @@ +/* + * ff-protocol-ff800.c - a part of driver for RME Fireface series + * + * Copyright (c) 2018 Takashi Sakamoto + * + * Licensed under the terms of the GNU General Public License, version 2. + */ + +#include <linux/delay.h> + +#include "ff.h" + +#define FF800_STF 0x0000fc88f000 +#define FF800_RX_PACKET_FORMAT 0x0000fc88f004 +#define FF800_ALLOC_TX_STREAM 0x0000fc88f008 +#define FF800_ISOC_COMM_START 0x0000fc88f00c +#define FF800_TX_S800_FLAG 0x00000800 +#define FF800_ISOC_COMM_STOP 0x0000fc88f010 + +#define FF800_TX_PACKET_ISOC_CH 0x0000801c0008 + +static int allocate_rx_resources(struct snd_ff *ff) +{ + u32 data; + __le32 reg; + int err; + + // Controllers should allocate isochronous resources for rx stream. + err = fw_iso_resources_allocate(&ff->rx_resources, + amdtp_stream_get_max_payload(&ff->rx_stream), + fw_parent_device(ff->unit)->max_speed); + if (err < 0) + return err; + + // Set isochronous channel and the number of quadlets of rx packets. + data = ff->rx_stream.data_block_quadlets << 3; + data = (data << 8) | ff->rx_resources.channel; + reg = cpu_to_le32(data); + return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + FF800_RX_PACKET_FORMAT, ®, sizeof(reg), 0); +} + +static int allocate_tx_resources(struct snd_ff *ff) +{ + __le32 reg; + unsigned int count; + unsigned int tx_isoc_channel; + int err; + + reg = cpu_to_le32(ff->tx_stream.data_block_quadlets); + err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + FF800_ALLOC_TX_STREAM, ®, sizeof(reg), 0); + if (err < 0) + return err; + + // Wait till the format of tx packet is available. + count = 0; + while (count++ < 10) { + u32 data; + err = snd_fw_transaction(ff->unit, TCODE_READ_QUADLET_REQUEST, + FF800_TX_PACKET_ISOC_CH, ®, sizeof(reg), 0); + if (err < 0) + return err; + + data = le32_to_cpu(reg); + if (data != 0xffffffff) { + tx_isoc_channel = data; + break; + } + + msleep(50); + } + if (count >= 10) + return -ETIMEDOUT; + + // NOTE: this is a makeshift to start OHCI 1394 IR context in the + // channel. On the other hand, 'struct fw_iso_resources.allocated' is + // not true and it's not deallocated at stop. + ff->tx_resources.channel = tx_isoc_channel; + + return 0; +} + +static int ff800_begin_session(struct snd_ff *ff, unsigned int rate) +{ + __le32 reg; + int err; + + reg = cpu_to_le32(rate); + err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + FF800_STF, ®, sizeof(reg), 0); + if (err < 0) + return err; + + // If starting isochronous communication immediately, change of STF has + // no effect. In this case, the communication runs based on former STF. + // Let's sleep for a bit. + msleep(100); + + err = allocate_rx_resources(ff); + if (err < 0) + return err; + + err = allocate_tx_resources(ff); + if (err < 0) + return err; + + reg = cpu_to_le32(0x80000000); + reg |= cpu_to_le32(ff->tx_stream.data_block_quadlets); + if (fw_parent_device(ff->unit)->max_speed == SCODE_800) + reg |= cpu_to_le32(FF800_TX_S800_FLAG); + return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + FF800_ISOC_COMM_START, ®, sizeof(reg), 0); +} + +static void ff800_finish_session(struct snd_ff *ff) +{ + __le32 reg; + + reg = cpu_to_le32(0x80000000); + snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST, + FF800_ISOC_COMM_STOP, ®, sizeof(reg), 0); +} + +static void ff800_handle_midi_msg(struct snd_ff *ff, __le32 *buf, size_t length) +{ + int i; + + for (i = 0; i < length / 4; i++) { + u8 byte = le32_to_cpu(buf[i]) & 0xff; + struct snd_rawmidi_substream *substream; + + substream = READ_ONCE(ff->tx_midi_substreams[0]); + if (substream) + snd_rawmidi_receive(substream, &byte, 1); + } +} + +const struct snd_ff_protocol snd_ff_protocol_ff800 = { + .handle_midi_msg = ff800_handle_midi_msg, + .begin_session = ff800_begin_session, + .finish_session = ff800_finish_session, +}; |