Merge isaki-audio2 branch, the overhaul of audio subsystem.
- Interrupt-oriented system rather than thread-oriented.
- Improve stability, quality and performance.
- Split playback and record cleanly. Improve halfduplex support.
- Many bugs are fixed including deadlocks, resource leaks, abuses, etc.
- Simplify audio filter mechanism. The encoding/channels/frequency
conversions are completely handled in the upper layer. So the hard-
ware driver only converts its hardware encoding (if necessary).
- audio_hw_if changes:
- Obsoletes query_encoding and add query_format instead.
- Obsoletes set_params and add set_format instead.
- Remove drain, setfd, mappage.
- The call sequences are changed.
- ioctl AUDIO_GETFD/SETFD, AUDIO_GETCHAN/SETCHAN are obsoleted.
- ioctl AUDIO_{QUERY,GET,SET}FORMAT are introduced.
- cleanup config attributes: au*conv and mulaw.
- All hardware drivers should follow it (I've done as much as possible).

Some file paths are changed:
- dev/audio.c -> dev/audio/audio.c (rewritten)
- dev/audiovar.h -> dev/audio/audiovar.h
- dev/audio_dai.h -> dev/audio/audio_dai.h
- dev/audio_if.h -> dev/audio/audio_if.h
- dev/audiobell.c -> dev/audio/audiobell.c
- dev/audiobellvar.h -> dev/audio/audiobellvar.h
- dev/mulaw.[ch] -> dev/audio/mulaw.[ch] + dev/audio/alaw.c

branches: 1.20.4;
fix device attributes

branches: 1.19.4;
Add gpio support for Xscale

From Stephan Meisenger in PR/52163

branches: 1.18.2; 1.18.16;
Provide generic a[24]x bus_space methods (aNx is normal access, offset
multipled by N).

Use the generic method and delete the other versions.

Discussed with matt@

branches: 1.17.4; 1.17.10;
PXA2X0_LCD_WRITETHROUGH is defflag'd.

branches: 1.16.4; 1.16.6;
Added SD/MMC support from OpenBSD.
tested on i386, amd64 at current-users ML by pgoyette@.
tested on zaurus by myself.

branches: 1.15.18; 1.15.26; 1.15.32;
Interrupt handling changes, in discussion since February:

- Reduce available SPL levels for hardware devices to none, vm, sched, high.
- Acquire kernel_lock only for interrupts at IPL_VM.
- Implement threaded soft interrupts.

branches: 1.14.4; 1.14.18; 1.14.20; 1.14.22; 1.14.24; 1.14.30;
Add PXA2x0 RTC driver.

branches: 1.13.2;
Updates to allow Zaurus screen to rotate 90 degrees to a usable state with the keyboard. Patch from peter@ copied from OpenBSD. Feedback and OK from matt@

Update from the latest Zaurus source from NONAKA Kimihiro.

Includes drivers for I2C, I2S, PCMCIA controller, USB device controller,
OHCI USB controller (from OpenBSD) and some improvements to the LCD
controller driver.

Zaurus Port from OpenBSD by Nonaka Kimihiro
OK gimpy

Add definition the HWUART (and NSSP).

branches: 1.9.20; 1.9.22;
merge ktrace-lwp.

branches: 1.8.2;
The first step to support Intel PXA270.

kernel config option CPU_XSCALE_PXA2X0 is now obsoleted by
CPU_XSCALE_PXA250 and CPU_XSCALE_PXA270. If both of them are defined,
CPU is determined run-time.

Add support for the DMA and AC97 controllers on PXA2x0, and enable them
on the Lubbock evaluation board.

Many thanks to Hiroyuki Bessho for testing this driver with the new
aurateconv interface, as I no longer have access to the hardware.

Contributed by Wasabi Systems, Inc.

branches: 1.6.4;
COM_PXA2X0 is now defflag'd in sys/conf/files

branches: 1.5.2;
Gah, fix previous. s/defopt/defflag/

- Rearrange the PXA2x0 support code to better support attaching
child drivers such as interrupt and gpio controllers.
- Add a function to probe SDRAM size at boot time.
- Add a function to configure the Clock Manager's CKEN settings.
- Add an INTC driver.
- Add a GPIO driver.
- Add attach glue for the PXA2x0's "almost" 16550-compatible uarts.
- Tweak the LCD driver to use the GPIO driver's services for setting
up GPIO pin function.

Use the generic irq_dispatch.S

comment out a file that is not in the tree yet.

branches: 1.1.2;
Config information for Intel PXA2xx application processors.

fix device attributes

branches: 1.19.4;
Add gpio support for Xscale

From Stephan Meisenger in PR/52163

branches: 1.18.2; 1.18.16;
Provide generic a[24]x bus_space methods (aNx is normal access, offset
multipled by N).

Use the generic method and delete the other versions.

Discussed with matt@

branches: 1.17.4; 1.17.10;
PXA2X0_LCD_WRITETHROUGH is defflag'd.

branches: 1.16.4; 1.16.6;
Added SD/MMC support from OpenBSD.
tested on i386, amd64 at current-users ML by pgoyette@.
tested on zaurus by myself.

branches: 1.15.18; 1.15.26; 1.15.32;
Interrupt handling changes, in discussion since February:

- Reduce available SPL levels for hardware devices to none, vm, sched, high.
- Acquire kernel_lock only for interrupts at IPL_VM.
- Implement threaded soft interrupts.

branches: 1.14.4; 1.14.18; 1.14.20; 1.14.22; 1.14.24; 1.14.30;
Add PXA2x0 RTC driver.

branches: 1.13.2;
Updates to allow Zaurus screen to rotate 90 degrees to a usable state with the keyboard. Patch from peter@ copied from OpenBSD. Feedback and OK from matt@

Update from the latest Zaurus source from NONAKA Kimihiro.

Includes drivers for I2C, I2S, PCMCIA controller, USB device controller,
OHCI USB controller (from OpenBSD) and some improvements to the LCD
controller driver.

Zaurus Port from OpenBSD by Nonaka Kimihiro
OK gimpy

Add definition the HWUART (and NSSP).

branches: 1.9.20; 1.9.22;
merge ktrace-lwp.

branches: 1.8.2;
The first step to support Intel PXA270.

kernel config option CPU_XSCALE_PXA2X0 is now obsoleted by
CPU_XSCALE_PXA250 and CPU_XSCALE_PXA270. If both of them are defined,
CPU is determined run-time.

Add support for the DMA and AC97 controllers on PXA2x0, and enable them
on the Lubbock evaluation board.

Many thanks to Hiroyuki Bessho for testing this driver with the new
aurateconv interface, as I no longer have access to the hardware.

Contributed by Wasabi Systems, Inc.

branches: 1.6.4;
COM_PXA2X0 is now defflag'd in sys/conf/files

branches: 1.5.2;
Gah, fix previous. s/defopt/defflag/

- Rearrange the PXA2x0 support code to better support attaching
child drivers such as interrupt and gpio controllers.
- Add a function to probe SDRAM size at boot time.
- Add a function to configure the Clock Manager's CKEN settings.
- Add an INTC driver.
- Add a GPIO driver.
- Add attach glue for the PXA2x0's "almost" 16550-compatible uarts.
- Tweak the LCD driver to use the GPIO driver's services for setting
up GPIO pin function.

Use the generic irq_dispatch.S

comment out a file that is not in the tree yet.

branches: 1.1.2;
Config information for Intel PXA2xx application processors.