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random thoughts on how i'm implementing this.

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matt 2000-05-31 03:42:34 +00:00
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$NetBSD: IMPLEMENTATION,v 1.1 2000/05/31 03:42:34 matt Exp $
At time point in time, there are 3 controller drivers planned:
fwochi IEEE 1394 OHCI Controller (PCI & CardBus)
fwlynx TI TSB12LV21 (found B&W G3s)
fwsony Sony CXD1947A (found on Sony Vaio laptops)
(Though as of this time, Sony has declined to release documentation
about the CXD1947A).
The device heirarchy will look like (using fwohci as the example):
#
# The controller driver. Handles the device-specific 1394 functions.
#
fwohci* at pci? dev ? function ?
#
# This is the actual controller-independent device. It has two
# parts: a netif (e.g interface fw0) and access via a character
# device of /dev/fwN. Access to isochronous service will be via
# the character device. Control of the firewire will also be via
# the character device.
#
fw* at fwohci?
#
# For each remote 1394 device on the 1394 bus, there will be a corresponding
# fwnode. If a 1394 device offers any supported services, they will be
# a child of corresponding fwnode. A particular fwnode can be tied to a
# specific device by specifing its nodeid as its identifier (XXX this
# is a 64 bit quantity and locators used by config must be 32 bit integers).
#
fwnode* at fw? nodeid ?
#
# One of the services that a node might offer is access to SCSI devices via
# SBP-2. As decsribed above, this mean a scsibus is a child of fwnode.
#
scsibus* at fwnode?
Note that with advent of highly mobile storage devices, the need for
signatures or other mechanisms to identity disks indepentend of their
localtion in the device hierarchy is sorely needed.
fwohci0 at pci1 dev 12 function 0: NEC uPD72870 IEEE 1394 OHCI Host Controller (rev. 0x01)
fwohci0: interrupting at isa irq 15
fwohci0: OHCI 1.0
fw0 at fwohci0: Id 00:d0:f5:20:00:00:5e:84, 400Mb/s, 1024 byte packets max
fw0: isochronous channels: 16 transmit, 16 receive
fwnode0 at fw0: Id xx:xx:xx:xx:xx:xx:xx:xx
The first time