Remove something like counters.
- Counting {open,close} is done by the MI audio layer.
- trigger_* is not called again between trigger_* and halt_*.

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: 1.15.4; 1.15.8;
overhaul the dbri driver and make it work again in the New Order Of Things
- fix switching between control and data mode
- make sure interrupts can happen in control mode
- implement audioif.commit_settings()
- switch to control mode only if needed - for changes in sample rate or format
but not for things like volume control
should fix PR 52786

fix audiomp bugs:
- switch from tsleep/wakeup to condvar
- fix locking in a bunch of places. there were several locking
against myself issues.

also:
- don't let dbri_process_interrupt_buffer() loop more than once
over the array of intrs.

this fixes hangs when using audio on ss20 in -current, but does
not make audio work. it eventually times out with eg:

dbri0: switching to control mode timed out (0 f6)

and may leave a sample in the audio buffer repeating.

branches: 1.13.24; 1.13.42;
Merge jmcneill-audiomp3 branch, which is derived from ad-audiomp2. From
the original ad-audiomp branch notes:

Add MP locking to the audio drivers.

Making the audio drivers MP safe is necessary before efforts
can be made to make the VM system MP safe.

The are two locks per device instance, an ISR lock and
a character device lock. The ISR lock replaces calls to
splaudio()/splx(), and will be held across calls to device
methods which were called at splaudio() before (e.g.
trigger_output). The character device lock is held across
calls to nearly all of the methods, excluding some only
used for initialization, e.g. get_locks.

Welcome to 5.99.57.

branches: 1.12.8; 1.12.10;
use config_finalize_register() instead of config_interrupts() to detect the
codec and attach audio. For some reason we run into a locking panic with
config_interrupts().
Tested on my SS20

branches: 1.11.4;
Remove struct sbusdev and related functions sbus_establish() and sbusreset().
They are derived from 4.4BSD/sparc and have been there since initial import
of NetBSD/sparc in 1993, but the struct sbusdev is almost unused for years,
nothing calls sbusreset(), and all (*sd->sd_reset)() functions look bogus.

Suggested by mrg@ and martin@, and tested on SS1+ and SS20.

struct device * -> device_t

move to 2 clause license

branches: 1.8.14; 1.8.16; 1.8.18; 1.8.20;
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: 1.7.6; 1.7.8; 1.7.14;
- don't pretend to support 8bit stereo - the hardware can do it but not the
way we currently use it ( needs a 2nd pipe for each direction )
- 8bit mono a-law and u-law should work now
- add support for audio input

- add dummy input methods so we don't panic if someone tries to read
- add dummy input mixer controls
- restart tx DMA on PWR_RESUME
- power up on PWR_RESUME only if we really have to
- add an option to control wether to spin or sleep when waiting for the chip
to switch between data and control mode

branches: 1.5.2; 1.5.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.4.8; 1.4.18;
keep the chip powered down when not in use on machines that support it
( like SPARCbooks ) - needs testing on other machines
tested on my SPARCbook 3GX

branches: 1.3.4; 1.3.6; 1.3.8; 1.3.10;
merge ktrace-lwp.

branches: 1.2.6;
Updated license

driver for the audio part of SUNW,DBRI ISDN/audio controllers

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: 1.15.8;
overhaul the dbri driver and make it work again in the New Order Of Things
- fix switching between control and data mode
- make sure interrupts can happen in control mode
- implement audioif.commit_settings()
- switch to control mode only if needed - for changes in sample rate or format
but not for things like volume control
should fix PR 52786

fix audiomp bugs:
- switch from tsleep/wakeup to condvar
- fix locking in a bunch of places. there were several locking
against myself issues.

also:
- don't let dbri_process_interrupt_buffer() loop more than once
over the array of intrs.

this fixes hangs when using audio on ss20 in -current, but does
not make audio work. it eventually times out with eg:

dbri0: switching to control mode timed out (0 f6)

and may leave a sample in the audio buffer repeating.

branches: 1.13.24; 1.13.42;
Merge jmcneill-audiomp3 branch, which is derived from ad-audiomp2. From
the original ad-audiomp branch notes:

Add MP locking to the audio drivers.

Making the audio drivers MP safe is necessary before efforts
can be made to make the VM system MP safe.

The are two locks per device instance, an ISR lock and
a character device lock. The ISR lock replaces calls to
splaudio()/splx(), and will be held across calls to device
methods which were called at splaudio() before (e.g.
trigger_output). The character device lock is held across
calls to nearly all of the methods, excluding some only
used for initialization, e.g. get_locks.

Welcome to 5.99.57.

branches: 1.12.8; 1.12.10;
use config_finalize_register() instead of config_interrupts() to detect the
codec and attach audio. For some reason we run into a locking panic with
config_interrupts().
Tested on my SS20

branches: 1.11.4;
Remove struct sbusdev and related functions sbus_establish() and sbusreset().
They are derived from 4.4BSD/sparc and have been there since initial import
of NetBSD/sparc in 1993, but the struct sbusdev is almost unused for years,
nothing calls sbusreset(), and all (*sd->sd_reset)() functions look bogus.

Suggested by mrg@ and martin@, and tested on SS1+ and SS20.

struct device * -> device_t

move to 2 clause license

branches: 1.8.14; 1.8.16; 1.8.18; 1.8.20;
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: 1.7.6; 1.7.8; 1.7.14;
- don't pretend to support 8bit stereo - the hardware can do it but not the
way we currently use it ( needs a 2nd pipe for each direction )
- 8bit mono a-law and u-law should work now
- add support for audio input

- add dummy input methods so we don't panic if someone tries to read
- add dummy input mixer controls
- restart tx DMA on PWR_RESUME
- power up on PWR_RESUME only if we really have to
- add an option to control wether to spin or sleep when waiting for the chip
to switch between data and control mode

branches: 1.5.2; 1.5.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.4.8; 1.4.18;
keep the chip powered down when not in use on machines that support it
( like SPARCbooks ) - needs testing on other machines
tested on my SPARCbook 3GX

branches: 1.3.4; 1.3.6; 1.3.8; 1.3.10;
merge ktrace-lwp.

branches: 1.2.6;
Updated license

driver for the audio part of SUNW,DBRI ISDN/audio controllers

overhaul the dbri driver and make it work again in the New Order Of Things
- fix switching between control and data mode
- make sure interrupts can happen in control mode
- implement audioif.commit_settings()
- switch to control mode only if needed - for changes in sample rate or format
but not for things like volume control
should fix PR 52786

fix audiomp bugs:
- switch from tsleep/wakeup to condvar
- fix locking in a bunch of places. there were several locking
against myself issues.

also:
- don't let dbri_process_interrupt_buffer() loop more than once
over the array of intrs.

this fixes hangs when using audio on ss20 in -current, but does
not make audio work. it eventually times out with eg:

dbri0: switching to control mode timed out (0 f6)

and may leave a sample in the audio buffer repeating.

branches: 1.13.42;
Merge jmcneill-audiomp3 branch, which is derived from ad-audiomp2. From
the original ad-audiomp branch notes:

Add MP locking to the audio drivers.

Making the audio drivers MP safe is necessary before efforts
can be made to make the VM system MP safe.

The are two locks per device instance, an ISR lock and
a character device lock. The ISR lock replaces calls to
splaudio()/splx(), and will be held across calls to device
methods which were called at splaudio() before (e.g.
trigger_output). The character device lock is held across
calls to nearly all of the methods, excluding some only
used for initialization, e.g. get_locks.

Welcome to 5.99.57.

branches: 1.12.8; 1.12.10;
use config_finalize_register() instead of config_interrupts() to detect the
codec and attach audio. For some reason we run into a locking panic with
config_interrupts().
Tested on my SS20

branches: 1.11.4;
Remove struct sbusdev and related functions sbus_establish() and sbusreset().
They are derived from 4.4BSD/sparc and have been there since initial import
of NetBSD/sparc in 1993, but the struct sbusdev is almost unused for years,
nothing calls sbusreset(), and all (*sd->sd_reset)() functions look bogus.

Suggested by mrg@ and martin@, and tested on SS1+ and SS20.

struct device * -> device_t

move to 2 clause license

branches: 1.8.14; 1.8.16; 1.8.18; 1.8.20;
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: 1.7.6; 1.7.8; 1.7.14;
- don't pretend to support 8bit stereo - the hardware can do it but not the
way we currently use it ( needs a 2nd pipe for each direction )
- 8bit mono a-law and u-law should work now
- add support for audio input

- add dummy input methods so we don't panic if someone tries to read
- add dummy input mixer controls
- restart tx DMA on PWR_RESUME
- power up on PWR_RESUME only if we really have to
- add an option to control wether to spin or sleep when waiting for the chip
to switch between data and control mode

branches: 1.5.2; 1.5.4;
Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

branches: 1.4.8; 1.4.18;
keep the chip powered down when not in use on machines that support it
( like SPARCbooks ) - needs testing on other machines
tested on my SPARCbook 3GX

branches: 1.3.4; 1.3.6; 1.3.8; 1.3.10;
merge ktrace-lwp.

branches: 1.2.6;
Updated license

driver for the audio part of SUNW,DBRI ISDN/audio controllers