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Add a CAPI (hardware independent) driver i4bcapi(4) and hardware driver iavc (4) to support active CAPI-based BRI and PRI cards (currently AVM B1 and T1 cards) to isdn4bsd.
151 lines
7.4 KiB
Plaintext
151 lines
7.4 KiB
Plaintext
$FreeBSD$
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Message-ID: <3AF56886.7D92609A@cubical.fi>
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Date: Sun, 06 May 2001 18:06:47 +0300
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From: Juha-Matti Liukkonen <jml@cubical.fi>
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Organization: Cubical Solutions Ltd
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Please find the attached diff and tarball for our support software for
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CAPI 2.0 and AVM's active T1 and T1-B (primary rate) and B1 (basic rate)
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ISDN adapters for isdn4bsd. The implementation has been made from
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scratch by us, based on reverse engineering of the Linux driver provided
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by AVM GmbH and available in ftp.avm.de. Cubical Solutions Ltd offers
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this implementation for the BSD community free of charge and assuming
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absolutely no liabilities whatsoever. Feel free to modify the
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implementation any way you see fit, but please retain our one-liner
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copyright statement somewhere in the comment headers in the capi and
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iavc driver modules.
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That said, the attached tarball is i4b-00.96.00-beta with our
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modifications integrated, and the diff contains all modifications we
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have made to the original (including the new capi files). Our mods add
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pseudo-device i4bcapi, which attaches to i4b layer 4, and device iavc0,
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which implements a link layer driver for AVM's active B1 and T1 adapters
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for i4bcapi. There are also a couple of related improvements to isdnd,
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and a number of modifications to isdnd and layer 4 to implement support
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for up to 30 channels per adapter (for primary rate use).
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We have developed the software explicitly for our telephony application,
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to be used with AVM's T1 adapters, and the implementation has been
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tested primarily with this functionality in mind. There may be
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interesting side effects with eg. the ipr and isppp drivers; we do not
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use them and therefore their testing has been cursory at best. The
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i4btel driver works well with the T1 (our primary use), and the i4brbch
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driver has been verified to work with T1, T1-B and B1 adapters (ftp'd
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some files over a dialup PPP connection with each adapter). Only the PCI
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versions of the adapters (equipped with the AMCC DMA controller) are
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supported, although the basics (PIO mode communication) for the older
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ISA model support is in place, so only the bus attachment modules should
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be required to support the older hardware.
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All of the AVM active adapters use downloadable firmware, which is not
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included in the attached package. The firmware files (t1.t4, t1b.t4,
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b1.t4) can be found from ftp.avm.de in adapter specific subdirectories,
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or from the CDs provided with the adapters (in directory
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'cardware/firmware').
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Our primary development platform is our own embedded build (we call it
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'ebsd') based on FreeBSD 4.2-RELEASE. The implementation has also been
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tested on standard FreeBSD 4.2-RELEASE system. The implementation should
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not contain any FreeBSD (or even FreeBSD release) specific issues, but
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it has not been tested or even compiled on any other platforms;
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specifically, only the FreeBSD overinstall.sh script is modified to
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install the capi/iavc support in the kernel source tree.
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This code is not under active development here since the functionality
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we use (i4btel, T1) has been working since the beginning of March. We
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are also not planning on any further development (no need seen at this
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point), but I am naturally interested on whatever bugs and development
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ideas pop up on the community and will keep a keen eye on the isdn
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mailing list. I personally may be available for consultation, debugging
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and possibly development projects, but with notable reservations on my
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time (the current IT industry recession seems to be pushing even more
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work for us, which tends to keep us pretty busy these days).
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Here are some specific technical notes:
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* isdnd supports new keyword 'firmware=</path/to/file>' in section
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'controller'. This keyword is supported for all controller types, and
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causes I4B_CTRL_DOWNLOAD ioctl to be invoked with the specified file as
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an argument. In systems equipped with both active and passive adapters,
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and the passive cards being detected first, dummy 'controller' entries
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are required for the passive cards to get the correct firmwares to
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correct adapters. (I hope you did not have other uses for this ioctl in
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mind?)
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* isdnd supports new keyword 'clone=<entry name>' in section 'entry'.
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This causes the entry to be copied from the existing named entry. At
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least entry specific 'name' and 'usrdeviceunit' values should be
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specified after a 'clone'. (Makes configuring 30 or 60 entries way much
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easier.)
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* a bug in i4btel driver read routine corrected. The conditions in the
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while() clause caused the receive queue to be referenced before checking
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if a channel is connected, leading to kernel panic (do a 'dd
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if=/dev/i4btel0 of=/dev/null' on an unconnected tel device, panic will
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follow). Correction was to reorder the while clause conditions to check
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for connectedness first.
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* isdnd and i4b layer 4 support up to CHANNELS_MAX (=30) channels per
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adapter. The msg_ctrl_info_req_t message reports the number of channels
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provided by the adapter, the number is stored in the nbchan field of the
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controller state structure. The fixed stateb1 and stateb2 entries in
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controller state stuctures are replaced with an array, and all fixed
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references there are replaced with loops up to nbchan. Passive stack
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layer 1 and 2 are not modified, layer 3 sets this field to fixed value 2
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for all adapters (but it could be delegated to the layer 1 driver's
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attach request).
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* the i4bcapi driver maps i4b channels to logical channels identified
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with PLCI/NCCI values in the CAPI protocol using the sc_bchan[] array.
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The PLCI/NCCI handling is merged in the channel mapping and is greatly
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simplified from the reference state machine model, because in practice
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there can be only one PLCI/NCCI per channel active at any given time.
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* the i4bcapi driver does not provide any kind of user level interface
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(such as the /dev/capi20 interface provided by the linux driver), but
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could relatively easily be extended to do so (and if done, interface
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compatibility with the linux implementation would probably be a good
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goal).
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* there are some gritty details in the iavc driver, inherited from the
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linux code. Despite us being a legitimate company in the telecom
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business, AVM failed to produce any programming reference material for
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us (at least in a reasonable time frame), so some guesswork remains due
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to classic reverse engineering process (particularly there are a few
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magic numbers in the card initialization sequence whose meaning I do not
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know).
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* pseudo-devices i4bq931, i4bq921 and some passive stack layer 1 driver
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(such as iwic) are required to compile, as the required ctrl_desc[]
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array is in layer 3, which requires layer 2, which requires layer 1.
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Some architectural cleanup would come in handy here, but we did not want
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to start making any major changes (and we use iwic in test setups
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anyway, so we simply always compile it in).
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To summarize: unpack, overinstall, add the following lines (with the
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usual passive stack configuration including at least one L1 driver) to
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your kernel configuration file:
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pseudo-device "i4bcapi"
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device iavc0
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...and the following to your isdnd.rc:
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controller
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firmware = /usr/lib/isdn/b1.t4
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...compile your new kernel, make sure the firmware file is in
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/usr/lib/isdn, and your B1 adapter should boot up and Just Work (tm). If
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you have multiple adapters, you need a 'controller' section for each to
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have them loaded and booted on isdnd startup.
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Have fun -- and let me know if there are any complications, or if I can
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be of further assistance,
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- Juha
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--
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Juha-Matti Liukkonen, Cubical Solutions Ltd
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Phone: +358(0)405280142
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Email: jml@cubical.fi
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