Fireface 802 was shipped by RME GmbH in 2014. This model supports later
protocol for management of isochronous communication and synchronization
of sampling transmission frequency.
This model consists of below ICs:
* TI TSB41AB2
* Xilinx Spartan-6 FPGA XC6SLX16
* TI TMS320 C6747
* SMSC USB3250
Especially, this model just supports IEEE 1394a, against its name which
evokes Fireface 800.
This commit adds support for Fireface 802 (tested). Userspace applications
can transfer PCM frames and MIDI messages via ALSA PCM/Rawmidi interface.
I note that 4 channels for ADAt1 and ADAT2 are disabled at higher sampling
transfer frequency since isochronous resources reservation fails due to
bandwidth limitation of IEEE 1394a.
The value read from LATTER_SYNC_STATUS register is slightly different
from the one of Fireface UCX. The higher 4 bits and lower 4 bits are
swapped within the same byte.
Without any assist of userspace application, transmitted MIDI messages
from the device are not going to be processed. For detail, please refer
to my comment in code of latter protocol.
$ python crpp < /sys/bus/firewire/devices/fw1/config_rom
ROM header and bus information block
-----------------------------------------------------------------
400 0404ffff bus_info_length 4, crc_length 4, crc 65535 (should be 26805)
404 31333934 bus_name "1394"
408 20008000 irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 0, max_rec 8 (512)
40c 000a3504 company_id 000a35 |
410 38077423 device_id 0438077423 | EUI-64 000a350438077423
root directory
-----------------------------------------------------------------
414 0005ffff directory_length 5, crc 65535 (should be 9514)
418 0c0083c0 node capabilities per IEEE 1394
41c 03000a35 vendor
420 8100000b --> descriptor leaf at 44c
424 8d000007 --> eui-64 leaf at 440
428 d1000001 --> unit directory at 42c
unit directory at 42c
-----------------------------------------------------------------
42c 0004ffff directory_length 4, crc 65535 (should be 45134)
430 12000a35 specifier id
434 13000005 version
438 17101800 model
43c 81000008 --> descriptor leaf at 45c
eui-64 leaf at 440
-----------------------------------------------------------------
440 0002ffff leaf_length 2, crc 65535 (should be 60131)
444 000a3504 company_id 000a35 |
448 38077423 device_id 0438077423 | EUI-64 000a350438077423
descriptor leaf at 44c
-----------------------------------------------------------------
44c 0003ffff leaf_length 3, crc 65535 (should be 469)
450 00000000 textual descriptor
454 00000000 minimal ASCII
458 524d4521 "RME!"
descriptor leaf at 45c
-----------------------------------------------------------------
45c 0005ffff leaf_length 5, crc 65535 (should be 10561)
460 00000000 textual descriptor
464 00000000 minimal ASCII
468 46697265 "Fire"
46c 66616365 "face"
470 20383032 " 802"
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20200510074301.116224-6-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>
062bb452b0