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 -- Documentation/cdrom/isp16

Docs by Eric van der Maarel 

This is the README for version 0.6 of the cdrom interface on an

ISP16, MAD16 or Mozart sound card.

The detection and configuration of this interface used to be included

in both the sjcd and optcd cdrom driver. Drives supported by these

drivers came packed with Media Magic's multi media kit, which also

included the ISP16 card. The idea (thanks Leo Spiekman)

to move it from these drivers into a separate module and moreover, not to

rely on the MAD16 sound driver, are as follows:

-duplication of code in the kernel is a waste of resources and should

 be avoided;

-however, kernels and notably those included with Linux distributions

 (cf Slackware 3.0 included version 0.5 of the isp16 configuration

 code included in the drivers) don't always come with sound support

 included. Especially when they already include a bunch of cdrom drivers.

 Hence, the cdrom interface should be configurable _independently_ of

 sound support.

The ISP16, MAD16 and Mozart sound cards have an OPTi 82C928 or an

OPTi 82C929 chip.  The interface on these cards should work with

any cdrom attached to the card, which is 'electrically' compatible

with Sanyo/Panasonic, Sony or Mitsumi non-ide drives. However, the

command sets for any proprietary drives may differ

(and hence may not be supported in the kernel) from these four types.

For a fact I know the interface works and the way of configuration

as described in this documentation works in combination with the

sjcd (in Sanyo/Panasonic compatibility mode) cdrom drivers

(probably with the optcd (in Sony compatibility mode) as well).

If you have such an OPTi based sound card and you want to use the

cdrom interface with a cdrom drive supported by any of the other cdrom

drivers, it will probably work. Please let me know any experience you

might have).

I understand that cards based on the OPTi 82C929 chips may be configured

(hardware jumpers that is) as an IDE interface. Initialisation of such a

card in this mode is not supported (yet?).

The suggestion to configure the ISP16 etc. sound card by booting DOS and

do a warm reboot to boot Linux somehow doesn't work, at least not

on my machine (IPC P90), with the OPTi 82C928 based card.

Booting the kernel through the boot manager LILO allows the use

of some command line options on the 'LILO boot:' prompt. At boot time

press Alt or Shift while the LILO prompt is written on the screen and enter

any kernel options. Alternatively these options may be used in

the appropriate section in /etc/lilo.conf. Adding 'append=""'

will do the trick as well.

The syntax of 'cmd_line_options' is

        isp16=[[,[,]]][[,]]

If there is no ISP16 or compatibles detected, there's probably no harm done.

These options indicate the values that your cdrom drive has been (or will be)

configured to use.

Valid values for the base i/o address are:

  port=0x340,0x320,0x330,0x360

for the interrupt request number

  irq=0,3,5,7,9,10,11

for the direct memory access line

  dma=0,3,5,6,7

and for the type of drive

  drive_type=noisp16,Sanyo,Panasonic,Sony,Mitsumi.

Note that these options are case sensitive.

The values 0 for irq and dma indicate that they are not used, and

the drive will be used in 'polling' mode. The values 5 and 7 for irq

should be avoided in order to avoid any conflicts with optional

sound card configuration.

The syntax of the command line does not allow the specification of

irq when there's nothing specified for the base address and no

specification of dma when there is no specification of irq.

The value 'noisp16' for drive_type, which may be used as the first

non-integer option value (e.g. 'isp16=noisp16'), makes sure that probing

for and subsequent configuration of an ISP16-compatible card is skipped

all together. This can be useful to overcome possible conflicts which

may arise while the kernel is probing your hardware.

The default values are

  port=0x340

  irq=0

  dma=0

  drive_type=Sanyo

reflecting my own configuration. The defaults can be changed in

the file linux/drivers/cdrom/ips16.h.

The cdrom interface can be configured at run time by loading the

initialisation driver as a module. In that case, the interface

parameters can be set by giving appropriate values on the command

line. Configuring the driver can then be done by the following

command (assuming you have iso16.o installed in a proper place):

  insmod isp16.o isp16_cdrom_base= isp16_cdrom_irq= \

    isp16_cdrom_dma= isp16_cdrom_type=

where port, irq, dma and drive_type can have any of the values mentioned

above.

Have fun!