toshsat1800-irdasetup

Version 0.2 2002/04/07 15:42

Description:

IrDA configurator for laptops with ALI1533 bridge (LPC47N227 SuperIO), smc-ircc
and not initializing BIOS (tested on Toshiba Satellite 1800-514) to be
used with Linux kernel.
Copyright (C) 2002, Daniele Peri <peri@csai.unipa.it>

http://lancelot.csai.unipa.it/~peri/toshsat1800-irdasetup.tgz

Problem:

Toshiba Satellite 1800 laptops are provided with a SMCS LPC47N227 SuperIO chip which is IrDA SIR/FIR capable. The chip is connected through an ALI1533 PCI-ISA bridge. The IrDA subsystem of the SuperIO chip is supported by the smc-ircc Linux kernel module. Unfortunately the BIOS neither configurates the SuperIO chip IrDA subsystem (SIR port, FIR port, dma, irq, IrDA mode, power) nor sets the PCI-ISA bridge to decode any usable port.
Linux kernel is thus prevented to detect the second UART making impossible to use it in SIR mode. For the same reason, the FIR mode smc-ircc is able to detect the SuperIO chip but, once found the IrDA subsystem unconfigured, fails to install.

Solution:

toshsat1800-irdasetup sets SIR and FIR ioport addresses, DMA and IRQ of the SuperIO chip IrDA subsystem then powers on the second UART. It also configures the PCI-ISA bridge to decode SIR and FIR ports. All this configuration work should be rather done into the kernel but it was more practical and safe to make a small testing tool of it. It can be probably extended to include configuration kludges for other similar SuperIO and ISA bridge combination.
Testing was carried on a Toshiba Satellite 1800-514 with Linux kernel 2.4.17.
I hope this work could be helpful, it was quite funny to do it however.

Compilation (Requires pci-utils):

	$ cd toshsat1800-irdasetup/
	$ make

Usage:

Run it as root:
	$ ./toshsat1800-irdasetup 

then you can install the smc-ircc module:
	$ modprobe smc-ircc

I've noticed that the smc-ircc needs parameters ircc_sir and ircc_fir to be specified. So you'd probably add:

	options smc-ircc ircc_dma=3 ircc_irq=7 ircc_cfg=0x2e ircc_sir=0x2e8 ircc_fir=0x2f8

to /etc/modules.conf

You may also want to add a line like:

	pre-install smc-ircc /usr/local/sbin/toshsat1800-smcinit

to /etc/modules.conf in order to obtain full automatic IrDA setup.
You'll need to execute:

	$ depmod -a
	
after modifying /etc/modules.conf to make changes effective.

Default values works for Toshiba Satellite 1800 though any configuration value can be changed through options. So far I've discovered how to enable decoding of the following usable ports: 0x2e8, 0x2f8, 0x130, 0x178.
The list of all options is obtaineable through:

	$ toshsat1800-irdasetup --help


Appendix:

Ericsson T39m. Setting up an Ircomm link with this phone requires to explicitly reduce the maximum speed to 115200:

	$ echo 115200 > /proc/sys/net/irda/max_baud_rate

Disclaimer:
This software is experimental. Use it at your own risk.

Credits:

* SMSC for the downloadable datasheets
* Paul Hampson for its Linux IrDA mailing list messages.

To do:

* Add more ALI1533 usable ports