Miglia Technology ships Harmony Audio 2004. It uses Oxford Semiconductor
OXFW970 for communication function in IEEE 1394 bus. This commit adds
support for the model.

In my opinion, the firmware of ASIC is really the initial stage, since
it has the following quirks.

* It skips several isochronous cycles to transmit isochronous packets
  when receiving any asynchronous transaction.
* The value of dbc field in the transmitted packet is the number of
  accumulated quadlets in CIP payload, instead of the accumulated data
  blocks. Furthermore, the value includes the quadlets of CIP payload in
  the packet.
* It neither supports AV/C Stream Format Information command nor AV/C
  Extended Stream Format Information command.
* The vendor and model information in root directory of configuration
  ROM includes some mistakes.

Additionally, when operating at 96.0 kHz, it often skips much isochronous
cycles to transmit the isochronous packets. The issue is detected as cycle
discontinuity and ALSA PCM application receives -EIO at any operation for
PCM substream. I have never found any workaround yet.

$ config-rom-pretty-printer < /sys/bus/firewire/devices/fw1/config_rom
               ROM header and bus information block
               -----------------------------------------------------------------
1024  04249e04  bus_info_length 4, crc_length 36, crc 40452
1028  31333934  bus_name "1394"
1032  20ff5003  irmc 0, cmc 0, isc 1, bmc 0, cyc_clk_acc 255, max_rec 5 (64)
1036  0030e002  company_id 0030e0     |
1040  00454647  device_id 8594474567  | EUI-64 13757098081207879

               root directory
               -----------------------------------------------------------------
1044  00062d69  directory_length 6, crc 11625
1048  030030e0  vendor
1052  8100000a  --> descriptor leaf at 1092
1056  1700f970  model
1060  81000011  --> descriptor leaf at 1128
1064  0c0083c0  node capabilities: per IEEE 1394
1068  d1000001  --> unit directory at 1072

               unit directory at 1072
               -----------------------------------------------------------------
1072  00046ff9  directory_length 4, crc 28665 (should be 43676)
1076  1200a02d  specifier id
1080  13010001  version
1084  1700f970  model
1088  8100000f  --> descriptor leaf at 1148

               descriptor leaf at 1092
               -----------------------------------------------------------------
1092  00085f8a  leaf_length 8, crc 24458
1096  00000000  textual descriptor
1100  00000000  minimal ASCII
1104  4d69676c  "Migl"
1108  69612054  "ia T"
1112  6563686e  "echn"
1116  6f6c6f67  "olog"
1120  79204c74  "y Lt"
1124  642e0000  "d."

               descriptor leaf at 1128
               -----------------------------------------------------------------
1128  00040514  leaf_length 4, crc 1300
1132  00000000  textual descriptor
1136  00000000  minimal ASCII
1140  4f584657  "OXFW"
1144  20393730  " 970"

               descriptor leaf at 1148
               -----------------------------------------------------------------
1148  0005a1dc  leaf_length 5, crc 41436
1152  00000000  textual descriptor
1156  00000000  minimal ASCII
1160  4861726d  "Harm"
1164  6f6e7941  "onyA"
1168  7564696f  "udio"
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20240218074128.95210-5-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>