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-
-Documentation for the Cirrus Logic/Crystal SoundFusion cs46xx/cs4280 audio
-controller chips (2001/05/11)
-
-The cs46xx audio driver supports the DSP line of Cirrus controllers.
-Specifically, the cs4610, cs4612, cs4614, cs4622, cs4624, cs4630 and the cs4280
-products. This driver uses the generic ac97_codec driver for AC97 codec
-support.
-
-
-Features:
-
-Full Duplex Playback/Capture supported from 8k-48k.
-16Bit Signed LE & 8Bit Unsigned, with Mono or Stereo supported.
-
-APM/PM - 2.2.x PM is enabled and functional. APM can also
-be enabled for 2.4.x by modifying the CS46XX_ACPI_SUPPORT macro
-definition.
-
-DMA playback buffer size is configurable from 16k (defaultorder=2) up to 2Meg
-(defaultorder=11). DMA capture buffer size is fixed at a single 4k page as
-two 2k fragments.
-
-MMAP seems to work well with QuakeIII, and test XMMS plugin.
-
-Myth2 works, but the polling logic is not fully correct, but is functional.
-
-The 2.4.4-ac6 gameport code in the cs461x joystick driver has been tested
-with a Microsoft Sidewinder joystick (cs461x.o and sidewinder.o). This
-audio driver must be loaded prior to the joystick driver to enable the
-DSP task image supporting the joystick device.
-
-
-Limitations:
-
-SPDIF is currently not supported.
-
-Primary codec support only. No secondary codec support is implemented.
-
-
-
-NOTES:
-
-Hercules Game Theatre XP - the EGPIO2 pin controls the external Amp,
-and has been tested.
-Module parameter hercules_egpio_disable set to 1, will force a 0 to EGPIODR
-to disable the external amplifier.
-
-VTB Santa Cruz - the GPIO7/GPIO8 on the Secondary Codec control
-the external amplifier for the "back" speakers, since we do not
-support the secondary codec then this external amp is not
-turned on. The primary codec external amplifier is supported but
-note that the AC97 EAPD bit is inverted logic (amp_voyetra()).
-
-DMA buffer size - there are issues with many of the Linux applications
-concerning the optimal buffer size. Several applications request a
-certain fragment size and number and then do not verify that the driver
-has the ability to support the requested configuration.
-SNDCTL_DSP_SETFRAGMENT ioctl is used to request a fragment size and
-number of fragments. Some applications exit if an error is returned
-on this particular ioctl. Therefore, in alignment with the other OSS audio
-drivers, no error is returned when a SETFRAGs IOCTL is received, but the
-values passed from the app are not used in any buffer calculation
-(ossfragshift/ossmaxfrags are not used).
-Use the "defaultorder=N" module parameter to change the buffer size if
-you have an application that requires a specific number of fragments
-or a specific buffer size (see below).
-
-Debug Interface
----------------
-There is an ioctl debug interface to allow runtime modification of the
-debug print levels. This debug interface code can be disabled from the
-compilation process with commenting the following define:
-#define CSDEBUG_INTERFACE 1
-There is also a debug print methodolgy to select printf statements from
-different areas of the driver. A debug print level is also used to allow
-additional printfs to be active. Comment out the following line in the
-driver to disable compilation of the CS_DBGOUT print statements:
-#define CSDEBUG 1
-
-Please see the definitions for cs_debuglevel and cs_debugmask for additional
-information on the debug levels and sections.
-
-There is also a csdbg executable to allow runtime manipulation of these
-parameters. for a copy email: twoller@crystal.cirrus.com
-
-
-
-MODULE_PARMS definitions
-------------------------
-module_param(defaultorder, ulong, 0);
-defaultorder=N
-where N is a value from 1 to 12
-The buffer order determines the size of the dma buffer for the driver.
-under Linux, a smaller buffer allows more responsiveness from many of the
-applications (e.g. games). A larger buffer allows some of the apps (esound)
-to not underrun the dma buffer as easily. As default, use 32k (order=3)
-rather than 64k as some of the games work more responsively.
-(2^N) * PAGE_SIZE = allocated buffer size
-
-module_param(cs_debuglevel, ulong, 0644);
-module_param(cs_debugmask, ulong, 0644);
-cs_debuglevel=N
-cs_debugmask=0xMMMMMMMM
-where N is a value from 0 (no debug printfs), to 9 (maximum)
-0xMMMMMMMM is a debug mask corresponding to the CS_xxx bits (see driver source).
-
-module_param(hercules_egpio_disable, ulong, 0);
-hercules_egpio_disable=N
-where N is a 0 (enable egpio), or a 1 (disable egpio support)
-
-module_param(initdelay, ulong, 0);
-initdelay=N
-This value is used to determine the millescond delay during the initialization
-code prior to powering up the PLL. On laptops this value can be used to
-assist with errors on resume, mostly with IBM laptops. Basically, if the
-system is booted under battery power then the mdelay()/udelay() functions fail to
-properly delay the required time. Also, if the system is booted under AC power
-and then the power removed, the mdelay()/udelay() functions will not delay properly.
-
-module_param(powerdown, ulong, 0);
-powerdown=N
-where N is 0 (disable any powerdown of the internal blocks) or 1 (enable powerdown)
-
-
-module_param(external_amp, bool, 0);
-external_amp=1
-if N is set to 1, then force enabling the EAPD support in the primary AC97 codec.
-override the detection logic and force the external amp bit in the AC97 0x26 register
-to be reset (0). EAPD should be 0 for powerup, and 1 for powerdown. The VTB Santa Cruz
-card has inverted logic, so there is a special function for these cards.
-
-module_param(thinkpad, bool, 0);
-thinkpad=1
-if N is set to 1, then force enabling the clkrun functionality.
-Currently, when the part is being used, then clkrun is disabled for the entire system,
-but re-enabled when the driver is released or there is no outstanding open count.
-