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-Documentation for the OPL3-SA2, SA3, and SAx driver (opl3sa2.o)
----------------------------------------------------------------
-
-Scott Murray, scott@spiteful.org
-January 7, 2001
-
-NOTE: All trade-marked terms mentioned below are properties of their
- respective owners.
-
-
-Supported Devices
------------------
-
-This driver is for PnP soundcards based on the following Yamaha audio
-controller chipsets:
-
-YMF711 aka OPL3-SA2
-YMF715 and YMF719 aka OPL3-SA3
-
-Up until recently (December 2000), I'd thought the 719 to be a
-different chipset, the OPL3-SAx. After an email exhange with
-Yamaha, however, it turns out that the 719 is just a re-badged
-715, and the chipsets are identical. The chipset detection code
-has been updated to reflect this.
-
-Anyways, all of these chipsets implement the following devices:
-
-OPL3 FM synthesizer
-Soundblaster Pro
-Microsoft/Windows Sound System
-MPU401 MIDI interface
-
-Note that this driver uses the MSS device, and to my knowledge these
-chipsets enforce an either/or situation with the Soundblaster Pro
-device and the MSS device. Since the MSS device has better
-capabilities, I have implemented the driver to use it.
-
-
-Mixer Channels
---------------
-
-Older versions of this driver (pre-December 2000) had two mixers,
-an OPL3-SA2 or SA3 mixer and a MSS mixer. The OPL3-SA[23] mixer
-device contained a superset of mixer channels consisting of its own
-channels and all of the MSS mixer channels. To simplify the driver
-considerably, and to partition functionality better, the OPL3-SA[23]
-mixer device now contains has its own specific mixer channels. They
-are:
-
-Volume - Hardware master volume control
-Bass - SA3 only, now supports left and right channels
-Treble - SA3 only, now supports left and right channels
-Microphone - Hardware microphone input volume control
-Digital1 - Yamaha 3D enhancement "Wide" mixer
-
-All other mixer channels (e.g. "PCM", "CD", etc.) now have to be
-controlled via the "MS Sound System (CS4231)" mixer. To facilitate
-this, the mixer device creation order has been switched so that
-the MSS mixer is created first. This allows accessing the majority
-of the useful mixer channels even via single mixer-aware tools
-such as "aumix".
-
-
-Plug 'n Play
-------------
-
-In previous kernels (2.2.x), some configuration was required to
-get the driver to talk to the card. Being the new millennium and
-all, the 2.4.x kernels now support auto-configuration if ISA PnP
-support is configured in. Theoretically, the driver even supports
-having more than one card in this case.
-
-With the addition of PnP support to the driver, two new parameters
-have been added to control it:
-
-isapnp - set to 0 to disable ISA PnP card detection
-
-multiple - set to 0 to disable multiple PnP card detection
-
-
-Optional Parameters
--------------------
-
-Recent (December 2000) additions to the driver (based on a patch
-provided by Peter Englmaier) are two new parameters:
-
-ymode - Set Yamaha 3D enhancement mode:
- 0 = Desktop/Normal 5-12 cm speakers
- 1 = Notebook PC (1) 3 cm speakers
- 2 = Notebook PC (2) 1.5 cm speakers
- 3 = Hi-Fi 16-38 cm speakers
-
-loopback - Set A/D input source. Useful for echo cancellation:
- 0 = Mic Right channel (default)
- 1 = Mono output loopback
-
-The ymode parameter has been tested and does work. The loopback
-parameter, however, is untested. Any feedback on its usefulness
-would be appreciated.
-
-
-Manual Configuration
---------------------
-
-If for some reason you decide not to compile ISA PnP support into
-your kernel, or disabled the driver's usage of it by setting the
-isapnp parameter as discussed above, then you will need to do some
-manual configuration. There are two ways of doing this. The most
-common is to use the isapnptools package to initialize the card, and
-use the kernel module form of the sound subsystem and sound drivers.
-Alternatively, some BIOS's allow manual configuration of installed
-PnP devices in a BIOS menu, which should allow using the non-modular
-sound drivers, i.e. built into the kernel.
-
-I personally use isapnp and modules, and do not have access to a PnP
-BIOS machine to test. If you have such a beast, configuring the
-driver to be built into the kernel should just work (thanks to work
-done by David Luyer <luyer@ucs.uwa.edu.au>). You will still need
-to specify settings, which can be done by adding:
-
-opl3sa2=<io>,<irq>,<dma>,<dma2>,<mssio>,<mpuio>
-
-to the kernel command line. For example:
-
-opl3sa2=0x370,5,0,1,0x530,0x330
-
-If you are instead using the isapnp tools (as most people have been
-before Linux 2.4.x), follow the directions in their documentation to
-produce a configuration file. Here is the relevant excerpt I used to
-use for my SA3 card from my isapnp.conf:
-
-(CONFIGURE YMH0800/-1 (LD 0
-
-# NOTE: IO 0 is for the unused SoundBlaster part of the chipset.
-(IO 0 (BASE 0x0220))
-(IO 1 (BASE 0x0530))
-(IO 2 (BASE 0x0388))
-(IO 3 (BASE 0x0330))
-(IO 4 (BASE 0x0370))
-(INT 0 (IRQ 5 (MODE +E)))
-(DMA 0 (CHANNEL 0))
-(DMA 1 (CHANNEL 1))
-
-Here, note that:
-
-Port Acceptable Range Purpose
----- ---------------- -------
-IO 0 0x0220 - 0x0280 SB base address, unused.
-IO 1 0x0530 - 0x0F48 MSS base address
-IO 2 0x0388 - 0x03F8 OPL3 base address
-IO 3 0x0300 - 0x0334 MPU base address
-IO 4 0x0100 - 0x0FFE card's own base address for its control I/O ports
-
-The IRQ and DMA values can be any that are considered acceptable for a
-MSS. Assuming you've got isapnp all happy, then you should be able to
-do something like the following (which matches up with the isapnp
-configuration above):
-
-modprobe mpu401
-modprobe ad1848
-modprobe opl3sa2 io=0x370 mss_io=0x530 mpu_io=0x330 irq=5 dma=0 dma2=1
-modprobe opl3 io=0x388
-
-See the section "Automatic Module Loading" below for how to set up
-/etc/modprobe.conf to automate this.
-
-An important thing to remember that the opl3sa2 module's io argument is
-for it's own control port, which handles the card's master mixer for
-volume (on all cards), and bass and treble (on SA3 cards).
-
-
-Troubleshooting
----------------
-
-If all goes well and you see no error messages, you should be able to
-start using the sound capabilities of your system. If you get an
-error message while trying to insert the opl3sa2 module, then make
-sure that the values of the various arguments match what you specified
-in your isapnp configuration file, and that there is no conflict with
-another device for an I/O port or interrupt. Checking the contents of
-/proc/ioports and /proc/interrupts can be useful to see if you're
-butting heads with another device.
-
-If you still cannot get the module to load, look at the contents of
-your system log file, usually /var/log/messages. If you see the
-message "opl3sa2: Unknown Yamaha audio controller version", then you
-have a different chipset version than I've encountered so far. Look
-for all messages in the log file that start with "opl3sa2: " and see
-if they provide any clues. If you do not see the chipset version
-message, and none of the other messages present in the system log are
-helpful, email me some details and I'll try my best to help.
-
-
-Automatic Module Loading
-------------------------
-
-Lastly, if you're using modules and want to set up automatic module
-loading with kmod, the kernel module loader, here is the section I
-currently use in my modprobe.conf file:
-
-# Sound
-alias sound-slot-0 opl3sa2
-options opl3sa2 io=0x370 mss_io=0x530 mpu_io=0x330 irq=7 dma=0 dma2=3
-options opl3 io=0x388
-
-That's all it currently takes to get an OPL3-SA3 card working on my
-system. Once again, if you have any other problems, email me at the
-address listed above.
-
-Scott