CVS log for src/sys/dev/ic/com.c

Up to [cvs.NetBSD.org] / src / sys / dev / ic

Request diff between arbitrary revisions

Keyword substitution: kv
Default branch: MAIN

Set a skip_attach_delay property to "true" for com port in virtual machines
to avoid a delay(10000) at attach

Trailing whitespace

Backout previous, this needs to be done differently

Avoid delay(10000) for virtual machines

com(4): Note ttylock in comment, not tty_lock.

com(4): Note timecounter_lock in lock order comments.

Revert com.c:r1.381 because i386/qemu cannot boot.  Pointed out by gson@n.o and martin@n.o.

Fix hang up writing /dev/console rarely in specific environments.

Some BMC seems to require these syncronous operations.  If not,
it does not send transmit completion interrupts for some reason.

KNF a comment

ddb/db_active.h: New home for extern db_active.

This can be included unconditionally, and db_active can then be
queried unconditionally; if DDB is not in the kernel, then db_active
is a constant zero.  Reduces need for #include opt_ddb.h, #ifdef DDB.

com(4): Nix quirky `integrate' macro.

Just use `static inline' like everything else.

com(4): Omit needless spltty in comstart.

This is called either via tp->t_oproc, which is done with tty_lock
held (thus, at IPL_VM = IPL_TTY), or from comparam which is called at
IPL_TTY, either via comopen or tp->t_param.

com(4): Nix dead code.

This was introduced in rev. 1.292, whose commit message was...
`Delete dead code.'  I guess December 6, 2009 was Opposite Day?

com(4): Comment on lock order.

com(4): Update confusing comment from decades ago to reflect now.

No functional change.

com: Add support for 32-bit IO accesses.

For the DW APB busy bit workaround, only attempt to re-apply LCR and DLB
settings for non-console devices. In the console case, simply clear the
busy bit and continue. Fixes an interrupt storm observed on Macchiatobin.

Restore 16-byte FIFO for ns16550a, accidentally lost in r1.344.

Spotted by msaitoh. Thanks!

- microtime -> microuptime
- avoid kpause with timeo=0

- use microtime instead of getmicrotime, suggested by thorpej
- use ttclos for wchan even though we are sleeping in comopen now

Note that while sleeping (HUPCL), time passes.
Try to avoid the otherwise infinite loop.

Now Jason has made this build, avoid a 50+ year
sleep to implement HUPCL.

com: speed up close with HUPCL set

Instead of incurring a 1s penalty on close of a com device with HUPCL set,
defer the sleep until the next open, and only sleep if necessary.

This has a side effect of making `ttyflags -a` with a default install not
pause for 1s for every non-console com device, which happens every boot
via /etc/rc.d/ttys.

Sync with HEAD.

only read cpr register if we're going to use the value

com(4): fix FIFO for DW_APB on Allwinner A20 (got broken by com.c 1.360)

Older DesignWare UARTs do not advertise their FIFO length so we must
provide it via device properties.

Sync with HEAD.

Sync with HEAD.

Introduce COM_HW_BROKEN_ETXRDY bit in sc_hwflags; push TX queue if
possible in comintr() even if IIR_NOPEND is asserted.

Combined with sc_poll_ticks, this flag works around HW bug, by which
ETXRDY interrupts are (sometimes) lost.

Introduce sc_poll_ticks and obsolete COM_HW_POLL bit in sc_hwflags.
Polling is scheduled at every sc_poll_ticks ticks.

This is useful to work around H/W bug, by which interrupts are lost
*sometimes*; interrupt-based I/O mostly works and no need for polling
every counter ticks.

Set sc_fifolen=1 for the no fifo case

Auto-detect DW APB UART FIFO length and print the FIFO length when enabled
instead of just "working fifo".

Make the readahead-while-sending-output code conditional in
com_common_putc(), only erquest readahead before interrupts are enabled
and when called from comcnputc().
Fixes PR kern/55286.

Get rid of needless __predict_true() and move a comment slightly.

Mostly merge changes from HEAD upto 20200411

Merge changes from current as of 20200406

Sync with head.

Use designated initializers

in many device attach paths, allocate memory with M_WAITOK instead of M_NOWAIT
and remove code to handle failures that can no longer happen.

Sync with HEAD

Synch with HEAD

Simplify regmap initialization, and fix an regmap issue that
affected TI OMAP (LCR register would get clobbered due to
using the wrong offset for the MDR1 register) reported by Lwazi Dube
(who also found the root cause).

Sync with HEAD, resolve a few conflicts

Add a convenience function, com_init_regs_stride(), that shifts the register
offsets and size by the specified amount.  Use in front-ends as appropriate.

sparc64 doesn't have a scalar bus_space_handle_t, so cope with this.
Also, add a comment about why we're using the dummy / nil space handle
in the first place.

Remove the COM_REGMAP option -- just use it all the time.  While here,
garbage-collect the COM_FUNCMAP and COM_AU1X00 options, as there are
not used anywhere.

Clean up initialization of com_regs structure, in preparation for
some additional changers.

Add support for com(4) without an interrupt by setting the COM_HW_POLL flag

Add support for a "force_console" property, where when set, reuses the console dev configuration

Sync with HEAD

Rename COM_TYPE_SUNXI -> COM_TYPE_DW_APB

Sync with HEAD, resolve some conflicts

Remove COM_AWIN option

Put back SUNXI definitions in the COM_REGMAP case; com.c uses them
without #ifdef COM_AWIN.
To be safe, expand the register map to 42 entries.

update from HEAD

Pull up following revision(s) (requested by martin in ticket #338):
	sys/arch/sparc64/dev/sab.c: revision 1.55
	sys/dev/ic/com.c: revision 1.345
	sys/dev/ic/z8530tty.c: revision 1.132
	sys/dev/sun/sunkbd.c: revision 1.30
	sys/dev/sun/sunms.c: revision 1.33
	sys/sys/tty.h: revision 1.94
As discussed on tech-kern: define a new tty internal state flag: TS_KERN_ONLY
Implement it in a few tty drivers. If this flag is set, the underlying
hardware is used by another driver and userland has no right to open
it. A few uses will appear soon in sys/dev/sun/sun{kbd,ms}.c.
--
PR port-sparc64/52622: mark the parent device as TS_KERN_ONLY,
so userland will not touch it (and change serial params w/o our
control).

As discussed on tech-kern: define a new tty internal state flag: TS_KERN_ONLY

Implement it in a few tty drivers. If this flag is set, the underlying
hardware is used by another driver and userland has no right to open
it. A few uses will appear soon in sys/dev/sun/sun{kbd,ms}.c.

Make all of the COM_xxx type options runtime selectable. Kernel configs
with the existing options (COM_16650, COM_16750, COM_AWIN, COM_HAYESP, and
COM_PXA2X0) will select the correct type in com_attach_subr. New code
should specify the com type by passing COM_TYPE_xxx to comcnattach and/or
setting sc_type.

Kill some more extern struct cfdriver declarations.

Down with externs in .c!

Sync with HEAD

Report AUXUART fifo size on rpi3 to 1 byte.  This prevents bluetooth
errors using the h5 protocol.

Broadcom AUX UART doesn't seem to set LSR RXRDY bit when data is available
in the RX FIFO.

Add COM_TYPE_BCMAUXUART type for BCM2835 AUX UART.

Pull up following revision(s) (requested by bouyer in ticket #1178):
	sys/arch/arm/allwinner/files.awin: revision 1.36
	sys/conf/files: revision 1.1159
	sys/dev/ic/com.c: revision 1.339
	sys/dev/ic/comreg.h: revision 1.25
	sys/dev/ic/comvar.h: revision 1.82
	sys/dev/ic/ns16550reg.h: revision 1.11
The UART in the allwiner SoCs is not full-compatible with the 16550, and
it's not a 16750 either. Like the 16750 it has the IIR_BUSY interrupt,
which is triggered when writing to LCR while the chip
can't accept it. But unlike the 16750, it has a specific register,
HALT, to allow writing to the LCR and divisor registers, and then
commit the changes.
Tested on an A20 SoC, changing the baud rate while keeping the
tty device open and incoming data.

Sync with HEAD

The UART in the allwiner SoCs is not full-compatible with the 16550, and
it's not a 16750 either. Like the 16750 it has the IIR_BUSY interrupt,
which is triggered when writing to LCR while the chip
can't accept it. But unlike the 16750, it has a specific register,
HALT, to allow writing to the LCR and divisor registers, and then
commit the changes.
Tested on an A20 SoC, changing the baud rate while keeping the
tty device open and incoming data.

Sync with HEAD (as of 26th Dec)

Fix TX FIFO on Tegra

PR/50395: Vicente Chaves de Melo: Loss of characters in serial port
communication between gdb and kgdb_stub: switch to line break interrupt
both when entering KGDB and also on shutdown so we can re-enter the debugger
with BREAK.

Sync with HEAD

For Tegra K1, set IE_RX_TIMEOUT (bit 4) in IER register. RX_TIMEOUT occurs
when data has been sitting in the Rx FIFO for more than 4 character times
without being read because there is not enough data to reach the trigger
level. With this change, enable FIFO usage for Tegra UARTs.

fix pasto, use SET() and CLR()
thanks jmcneill@

add COM_TYPE_TEGRA

Convert sys/dev to use <sys/rndsource.h>.

Sync with HEAD

KNF

Fix build.

Hi mipsallan

more Ingenic support:
- make sure we always set FIFO_UART_ON
- deal with the absence of DCD support
- enable the TX FIFO timeout interrupt
- set COM_HW_NOIEN
- pretend the FIFO is only 16 bytes deep ( supposed to be 64 but I get
  overruns with that )
now this works as CI20 console

deal with quirk in Ingenic UARTs
( they have a bit in the FIFO control register which turns the entire
  port off if not set )

centralize the dialout/call unit macros.

Rebase to HEAD as of a few days ago.

Merge tls-earlyentropy branch into HEAD.

Rebase.

Add d_discard to all struct cdevsw instances I could find.

All have been set to "nodiscard"; some should get a real implementation.

sync with head.

for a reference, the tree before this commit was tagged
as yamt-pagecache-tag8.

this commit was splitted into small chunks to avoid
a limitation of cvs.  ("Protocol error: too many arguments")

sync with head

Clear dtr on transition from !0 to 0, and set it on the opposite.
This leaves dtr alone in the normal case.

Be a little more clear and consistent about harvesting entropy from devices:

1) deprecate RND_FLAG_NO_ESTIMATE

2) define RND_FLAG_COLLECT_TIME, RND_FLAG_COLLECT_VALUE

3) define RND_FLAG_ESTIMATE_TIME, RND_FLAG_ESTIMATE_VALUE

4) define RND_FLAG_DEFAULT: RND_FLAG_COLLECT_TIME|
   RND_FLAG_COLLECT_VALUE|RND_FLAG_ESTIMATE_TIME

5) Make entropy harvesting from environmental sensors a little more generic
   and remove it from individual sensor drivers.

6) Remove individual open-coded delta-estimators for values from a few
   places in the tree (uvm, environmental drivers).

7) 0 -> RND_FLAG_DEFAULT, actually gather entropy from various drivers
   that had stubbed out code, other minor cleanups.

PR/48720: John Kelly: com driver does not allow B0 to be set. The code to
handle B0 was commented out for no reason given at revision 1.99. POSIX
mandates to hangup on B0:
http://pubs.opengroup.org/onlinepubs/9699919799/functions/tcsetattr.html

Change (mostly mechanically) every cdevsw/bdevsw I can find to use
designated initializers.

I have not built every extant kernel so I have probably broken at
least one build; however I've also found and fixed some wrong
cdevsw/bdevsw entries so even if so I think we come out ahead.

Now that cngetc supports -1 as a return value from the cn_getc routine,
let cngetc loop until a character is available so it can call the critpoll
hooks.

Use #if defined in previous.

Fix build.

lcr is only used when COM_16650 is defined; unbreak the build

Only attempt to set 64byte fifo for 16750 when COM_16750 is defined.

Hi kiyohara.

PR/48359 NetBSD/cobalt 6.99.25 GENERIC kernel freeze at initializing com0

Revirt 'Move the Marvell extension to com_mv.c' at Sun Sep 1 04:51:24 UTC 2013.
  build test only.

Minor tweaks for newer gcc

no EFR on tl16c750, use AFE bit on MCR reg instead for flow control

Add support 16750 64Byte FIFO.  But not test.

Move the Marvell extension to com_mv.c.

sync with head

As for the console of ns16750, comintr() may be called before comopen().
If sc_lcr is not initialized at this time, console will be in an ugly state.

Remove white-spaces, null-line and new-line.

resync from head

For a polled console incoming characters are buffered on output.
The buffer is never passed to the regular tty routines and can
survive from early boot to halt where it is read by the "press
any continue to reboot" loops.
As a workaround, just kill the read-ahead buffer when switching
from and to polled mode.

Add support for 16750 style UARTs. Activated by defining COM_16750.

Obtained from Marvell, Semihalf.

resync with head

Initialize t_softc.

sync with head

don't try to become console if we get is_console=false as device property

sync to latest -current.

sync with head.

Remove empty line.

sync to latest -current.

Pull up following revision(s) (requested by christos in ticket #190):
	sys/dev/ic/com.c: revision 1.305
don't include<sys/rnd.h>  before we define cn_trap, because it might bring
in<sys/systm.h>

don't include <sys/rnd.h> before we define cn_trap, because it might bring
in <sys/systm.h>

sync with head

merge to -current.

Entropy-pool implementation move and cleanup.

1) Move core entropy-pool code and source/sink/sample management code
   to sys/kern from sys/dev.

2) Remove use of NRND as test for presence of entropy-pool code throughout
   source tree.

3) Remove use of RND_ENABLED in device drivers as microoptimization to
   avoid expensive operations on disabled entropy sources; make the
   rnd_add calls do this directly so all callers benefit.

4) Fix bug in recent rnd_add_data()/rnd_add_uint32() changes that might
   have lead to slight entropy overestimation for some sources.

5) Add new source types for environmental sensors, power sensors, VM
   system events, and skew between clocks, with a sample implementation
   for each.

ok releng to go in before the branch due to the difficulty of later
pullup (widespread #ifdef removal and moved files).  Tested with release
builds on amd64 and evbarm and live testing on amd64.

more whitespace and comment spelling fixes

whitespace consistency adjustment

Sync with HEAD.

sync with head

Allow COM_TOLERANCE to be tweakable.  If comspeed returns an invalid
rate, don't use that error value to set the speed.

Fix early boot on AU1x type com ports.

Rename ttymalloc() to tty_alloc(), and ttyfree() to tty_free() for
consistency.  Remove some unnecessary malloc.h inclusions as well.

sync with head

Sync with HEAD

Revert part of changes in rev 1.298:
 - it breaks cobalt's serial console as mentioned in PR port-cobalt/44292
 - MCR_PRESCALE doesn't affect unless EFR_EFCR is set in the EFR register
 - even if MCR_PRESCALE is enabled we should define appropriate sc_type
   variants and BRG values should be adjusted in comspeed() per sc_type
 - sc_frequency should be adjusted in MD attachment if necessary
Tested on cobalt by several people, ok from jklos@

Let's cons.c poll and so don't loop until a chacater becomes available.

Sync with HEAD.

sync with head.

Add support for 16650's prescaler from Frank Wille. Tested with
IOblix on Amiga.

sync with head

Sync with HEAD.

Add default implementations for bus_space_is_equal(9),
bus_space_tag_create(9), and bus_space_tag_destroy(9).  Use
bus_space_is_equal(9) throughout the kernel to compare
bus_space_tag_t's.  Tested on i386 and on sparc64.

MI code should not compare bus_space_tag_t!  Introduce tags_are_equal()
for "comparing" two bus_space_tag_t's.  It is always true.

Everywhere that com(4) compares two tags, it compares to I/O base
addresses, too; comparing the base addresses should suffice.

TBD Clean this up more thoroughly.

sync with head

A pointer typedef entails trading too much flexibility to declare const
and non-const types, and the kernel uses both const and non-const
PMF qualifiers and device suspensors, so change the pmf_qual_t and
device_suspensor_t typedefs from "pointers to const" to non-pointer,
non-const types.

To print bus_addr_t value, cast it to u_long rather than size_t.

Expand PMF_FN_* macros.

Delete dead code.

Remove some unecessary includes sys/user.h header.

Remove some dead code.

Move the code in com_activate() to com_detach(), where it always
belonged.  Remove com_activate().

Consolidate information about the console on com(4) in a new struct
comcons_info.

Support detachment & re-attachment of a system console on com(4).
Re-attachment is somehow incomplete.  Ideally, if some other device
could take over as console, it would, but we're not quite there,
yet.

when attaching com, (frequency == -1) means leave the BRG divisor as-is
(inherit values established by firmware)

sync with head

Sync with HEAD.

Commit is split, to avoid a "too many arguments" protocol error.

add KASSERT to identify when PR kern/40734 happens again.
It happened to me twice and to Emmanuel Dreyfus (reported on port-amd64 ML)

sync with head.

Sync with HEAD.

Sync with HEAD.

remove extra semicolons.

Update haad-dm branch to haad-dm-base2.

Simplify NOERS case.  Revert most changes back to 1.283.

Fix a botch in an FIFO check for 16650.

Replace a "type" with "sc->sc_type" to make this build again for cobalt
(and I'm sure a few others as well).

Add support for 16550 chips without an Enhanced Register Set.

Sync with HEAD.

Sync with HEAD.

Sync with wrstuden-revivesa-base-2.

Sync with head.

Remove OMAP gunk in com_activate, it's not needed.

Spotted by Matthias Drochner.

Sync with HEAD.

sync with head.

sync with head.

More forgotten changes from matt-armv6.

Remove clause 3 and 4 from TNF licenses

Make ntp, pmc, reboot, sysarch, time syscalls MPSAFE.

If it's a high speed, trim the trigger level down to prevent overflows,
as comment says.  The piece of code was removed in rev 1.230,
but it looks an error on reverting of rev 1.228.

Sync with HEAD.

sync with head.

sync with HEAD

sync with head.

Fix compilation under options RND_COM and COM_DEBUG.
Reported by Kurt Schreiner on current-users@.

Split device_t and softc for all com(4) devices (well, everything that
uses a com_softc backend).  Use proper types and ansify where appropriate.

In com_detach(), don't destroy the lock twice.

Use device_t and its accessors.

Use pmf_device_register1() instead of shutdownhook_establish() to
register com_cleanup() as the shutdown hook.

Add a generic suspend routine.  Suspend and resume com@isa.

Protect against dereferencing a NULL softc in comioctl().

Destroy both a mutex and a callout in com_detach().

Cosmetic: use aprint_*_dev().  Use PMF_FN_ARGS, PMF_FN_PROTO.

Sync with HEAD.

sync with head.

Do not allow the system console to detach, because that will lead
to a panic.

Destroy mutex when detaching. PR kern/37819.

Sync with HEAD.

sync with head

Now that __HAVE_TIMECOUNTER and __HAVE_GENERIC_TODR are invariants,
remove the conditionals and the code associated with the undef case.

sync with HEAD

Sync with HEAD

Work around com hangs with pcmcia. PR kern/37462.

Sync with HEAD

Sync with HEAD.

Sync with head.

Add a resume handler for com@isa, using Jared McNeill's suggested
code from current-users.  com@acpi, et cetera, remain to be done.

Sync with HEAD.

Sync with HEAD.

Sync with head.

sync with head

Match the docs: MUTEX_DRIVER/SPIN are now only for porting code written
for Solaris.

Pull up following revision(s) (requested by is in ticket #1882):
	sys/dev/ic/com.c: revision 1.233
Revert the part of revision 1.228 that made HW_NO_TXPRELOAD the default:
it appears to break output on the Soekris net4501, which is a rather
popular platform.
This should fix PR kern/29612.

Pull up following revision(s) (requested by is in ticket #11394):
	sys/dev/ic/com.c: revision 1.233
Revert the part of revision 1.228 that made HW_NO_TXPRELOAD the default:
it appears to break output on the Soekris net4501, which is a rather
popular platform.
This should fix PR kern/29612.

Sync with HEAD.

Sync with HEAD

- Factor out too many copies of the same bit of tty code.
- Fix another tty signalling/wakeup problem.

sync with HEAD

Add support for OMAP specific com type.

sync with head.

Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.

Sync with HEAD.

Sync with head.

machine/{bus,cpu,intr}.h -> sys/{bus,cpu,intr}.h

sync with head.

Reapply rev 1.262 and add a comment about it.

sync with head.

Merge from vmlocking: use mutexes and the softint API.

Sync with HEAD.

sync with head.

Sync with HEAD.

Remove all locking from com_enable_debugport() - it is either called at
attach time, where we don't need further locking, or from comopen(),
where the caller does proper locking already.

Generic soft interrupts are mandatory.

Sync with head.

Merge some of the less invasive changes from the vmlocking branch:

- kthread, callout, devsw API changes
- select()/poll() improvements
- miscellaneous MT safety improvements

- Generic soft interrupts are mandatory, remove the kludges.
- Adapt to callout API change.
- Use mutexes.

- Increase the number of thread priorities from 128 to 256. How the space
  is set up is to be revisited.
- Implement soft interrupts as kernel threads. A generic implementation
  is provided, with hooks for fast-path MD code that can run the interrupt
  threads over the top of other threads executing in the kernel.
- Split vnode::v_flag into three fields, depending on how the flag is
  locked (by the interlock, by the vnode lock, by the file system).
- Miscellaneous locking fixes and improvements.

Sync with HEAD.

Kill caddr_t; there will be some MI fallout, but it will be fixed shortly.

sync with head.

Sync with head.

Make COM_HAYESP compile again.  It assumes no register mapping is needed.

sync with head.

sync with head.

aprint_naive("\n") to terminate "Found" line for quiet boot.
Use aprint_error to report that we are unable to establish power hook.

Sync with head.

__unused removal on arguments; approved by core.

sync with head

- sprinkle __unused on function decls.
- fix a couple of unused bugs
- no more -Wno-unused for i386

More from Matt Fleming:

Adapt to KAUTH_DEVICE_TTY_PRIVSET and KAUTH_DEVICE_TTY_OPEN.

Adapt MD code to KAUTH_DEVICE_TTY_OPEN, batch #2 from Matt Fleming, thanks!

Also, add forgotten splx() calls in some places.

Add "name" parameter to powerhook_establish, to aid debugging. No objections
on tech-kern@

sync with head

Pull up following revision(s) (requested by martin in ticket #118):
	sys/dev/ic/com.c: revision 1.251
fix a GCC uninitialised variable warning only seen at -O3.

sync with head

fix a GCC uninitialised variable warning only seen at -O3.

oops, no 'p' here. from xtraeme@.

don't call kauth_authorize_generic() when holding a lock, from yamt@.

- Use the LWP cached credentials where sane.
- Minor cosmetic changes.

Add an option COM_REGMAP to allow com(4) to use an array of register indices.
This allows us to convert aucom to just another com attachment, and cleanup
some code in the com_arbus.c.

Additionally, we use a common com_cleanup routine rather than having a
zillion copies of it in the attachment points.

This has been tested on a number architectures, and it has been shown to get
close to comparable performance when COM_REGMAP is defined, and comparable
when it is not defined.

Approved by core@.  Fixes PR port-evbmips/32362.

Merge from HEAD.

sync with head.

Make sure that a powerhook was successfully established before trying to
disestablish it on detach.

Add a power hook for the com device.

sync with head.

Sync with head.

Yes, I'm restoring COM_INIT_REGS and removing the compatibility #define's
for sc_iot and friends.  Those defines break things, like say ast.c, where
comvar.h is included, but a local sc_iot structure member is also used.

Per tsutsui@, I'm removing COM_INIT_REGS, and adding a flag to make the
map initialization automatic.  This breaks this whole tree again, so I pretty
much have to start over going back thru old code to make it all compatible.

KNF per simonb@ consisting of:
	regs.xx -> regs.cr_xxx
	wrap COM_INIT_REGS body with do { } while (0);)
Convert INB/OUTB macros to CSR_READ/CSR_WRITE macros per tsutsui@.

Fix a type where comconsregs was defined twice, and comkgdregs was missing.
Thanks to simonb@ Doh!

Initial com framework changes.  These changes bust *all* com consumers, but
follow-up commits shortly will fix many of them, so that i386, sparc, and
some evbmips ports at least work.

merge FreeBSD timecounters from branch simonb-timecounters
- struct timeval time is gone
  time.tv_sec -> time_second
- struct timeval mono_time is gone
  mono_time.tv_sec -> time_uptime
- access to time via
	{get,}{micro,nano,bin}time()
	get* versions are fast but less precise
- support NTP nanokernel implementation (NTP API 4)
- further reading:
  Timecounter Paper: http://phk.freebsd.dk/pubs/timecounter.pdf
  NTP Nanokernel: http://www.eecis.udel.edu/~mills/ntp/html/kern.html

Sync with head.

Merge 2006-05-24 NetBSD-current into the "peter-altq" branch.

sync with head.

integrate kauth.

Sync with head.

sync with head.

sync with head.

Merge 2006-03-31 NetBSD-current into the "peter-altq" branch.

Use device_unit().

generic_authorize() -> kauth_authorize_generic().

Adapt to kernel authorization KPI.

sync with head.

Use device_is_active() rather than testing dv_flags for DVF_ACTIVE
directly.

Adapt for timecounters and newer PPS API.

sync with head.

Save console baud rate as both the input and output rates.
This is what I thought I'd done in rev 1.237

remove the COM_MPLOCK option.  always include the spinlock in the softc
and always call the simple_* locking functions.  the locking functions
are compiled out if they are not needed anyway, so a separate option
for this doesn't gain anything.

this also fixes the serial console on my alpha ES40 (which doesn't make much
sense since the com driver should still be under the big lock on alpha,
but whatever).

merge ktrace-lwp.

Sync with HEAD. Here we go again...

Explicitly default the input baud rate (c_ispeed) to the output baud rate (c_ospeed)
instead of setting it to zero.  Otherwise nothing ever sets it unless some code
explicitly changes the baud rate.  For a serial console (in particular) we want
to use the baud rate set by the bios (or whatever) and used by theboot code.
This is the way it was before a 'new version of com driver' was added in 1997 (rev 1.99)

Change the driver open function's conditional for overriding exclusive tty
use from checking the proc's uid to suser(9), and account for the use of
privileges.  Noted by David Holland in PR kern/31126.

Make COM_DEBUG compile again in the wake of -Wwrite-strings;
from Nicolas Joly in PR kern/31141.

PR-30566: Poll must not return <sys/errno.h> values.
Start with those places I can easily test.

Revert the part of revision 1.228 that made HW_NO_TXPRELOAD the default:
it appears to break output on the Soekris net4501, which is a rather
popular platform.

This should fix PR kern/29612 -- if not, I will probably revert it again.

sync with -current

sync with head.  xen and whitespace.  xen part is not finished.

Sync with HEAD.

Hi Perry!

nuke trailing whitespace

Fix the sync with head I botched.

Sync with HEAD.

Sync with HEAD.

Do an extra read of the IIR during initialization, just to ack any pending
interrupt.

Sync with HEAD

Pull up revisions 1.228-1.230 (requested by mycroft in ticket #603):
  Incorporate 4 changes:
   o At high speed, set the FIFO trigger to a higher
     value to reduce interrupt load.  Fixes PR#15448.
   o Handle the case of IIR=RXRDY and LSR=!LSR_RCV_MASK
     differently, to avoid a hang with some chips.  Fixes
     PR#21184, and possibly PR#10974 and PR#8248.
   o Remove the extra wait at the end of com_common_putc(),
     after writing a character out, so that we get another
     TXRDY interrupt.  This prevents stalls when normal
     output and kernel output are mixed.  Fixes PR#4263.
   o Do not ``preload'' the TX FIFO; wait for a TXRDY
     interrupt to come in after enabling it.

Back off the trigger level a little.  Testing shows that it's not terribly
reliable at 14.

Minor simplification.

Incorporate 4 changes that have been suggested:
* At high speed, set the FIFO trigger to the maximum value to reduce interrupt
  load.  PR 15448.
* Handler the case of IIR=RXRDY and LSR=!LSR_RCV_MASK differently, to avoid a
  hang with some chips.  PR 21184, and possibly PR 10974 and PR 8248.
* Remove the extra wait at the end of com_common_putc(), after writing a
  character out, so that we get another TXRDY interrupt.  This prevents stalls
  when normal output and kernel output are mixed.  PR 4263.
* Do not "preload" the TX FIFO; wait for a TXRDY interrupt to come in after
  enabling it.

Rename the COM16650 option to COM_16650, for consistency with other
com variant options.

Wait just a little longer for console output to finish when we're
attaching the console uart.

Pull up revision 1.225 (requested by enami in ticket #1658):
Fix race condition introduced in rev 1.189; after the change, if there is
THRE interrupt occurs between the LSR read and IIR read, we won't see the
LSR_TXRDY bit when testing it in the variable `lsr' and we don't interrupted
again (as the corresponding bit in the IIR is cleared by reading, except
for some broken device).
Tested by Matthias Scheler and me, reviewed by Allen Briggs.
Closes PR#25010.

Pullup rev 1.225 (requested by enami in ticket #70)

Fix race condition introduced in rev 1.189; after the change, if there is
THRE interrupt occurs between the LSR read and IIR read, we won't see the
LSR_TXRDY bit when testing it in the variable 'lsr' and we don't get
interrupted again (as the corresponding bit in the IIR is cleared by reading,
except for some broken devices). PR#25010

Fix race condition introduced in rev 1.189; after the change, if there is
THRE interrupt occurs between the LSR read and IIR read, we won't see the
LSR_TXRDY bit when testing it in the variable `lsr' and we don't interrupted
again (as the corresponding bit in the IIR is cleared by reading, except
for some broken device).

Tested by Matthias Scheler and me, reviewed by Allen Briggs.
Closes PR#25010.

Fix NTP PPSAPI support (enabled with "options PPS_SYNC"):

From PR kern/13702 from Charles Carvalho.  Tested on alpha and
i386 with a Laipac TF10 PPS-capable GPS.  The com.c change was
copied wholesale from Charles' z8530tty.c patch.

Use just "type" and not "sc->sc_type" in cominit().

Pointed out by Shoichi Miyake in private mail.

Make comsoft_callout static; it's not referenced outside this file.

Be consistent with other COM_TYPE_PXA2x0 checks.

White space nit.

Add missing semicolon.

fix debugging printfs

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

Apply the aborted ktrace-lwp changes to a specific branch.  This is just for
others to review, I'm concerned that patch fuziness may have resulted in some
errant code being generated but I'll look at that later by comparing the diff
from the base to the branch with the file I attempt to apply to it.  This will,
at the very least, put the changes in a better context for others to review
them and attempt to tinker with removing passing of 'struct lwp' through
the kernel.

Back out the lwp/ktrace changes. They contained a lot of colateral damage,
and need to be examined and discussed more.

Restore parentheses around return value that were removed with the
previous commit.

Pass lwp pointers throughtout the kernel, as required, so that the lwpid can
be inserted into ktrace records.  The general change has been to replace
"struct proc *" with "struct lwp *" in various function prototypes, pass
the lwp through and use l_proc to get the process pointer when needed.

Bump the kernel rev up to 1.6V

Make sure to include opt_foo.h if a defflag option FOO is used.

in cominit(), turn on UUE bit in IER register if it is PXA2x0's
built-in UART.

Wrap some long lines.

Also pass a type argument to comcnattach() and com_kgdb_attach().
comspeed() (and thus cominit()) may need this information.

Introduce a new "type" field in the softc which is used to indicate
the general UART type.  Currently, we have "normal", "hayesp" and
"pxa2x0" types.  Replace the corresponding hw flags with the new type
values.

Add support, via a kernel config file option, for the 16550-compatible
com ports found on Intel PXA2x0 processors.

Re-arrange the code which detects the FIFO configuration to defer
printing until _after_ com_fifo is cleared. Some supposedly compatible
chips clear the Tx/Rx FIFOs when this happens, resulting in previous
output being lost.

Inialize sc_tty->t_dev early for serial console, so that cn_check_magic
will match in the case of a break before the console was opened for the
first time. Makes BREAKing into DDB work (again) as soon as interrupts
are enabled.

Allow the console to be used for kgdb if both DDB and KGDB are defined.

Ignore input when the port is not open.  This change is functionally
identical to the patch in kern/6502 (which is hereby fixed), but
modelled after the corresponding fix to the 8530 driver in
z8530tty.c revision 1.60 to maintain consistency with that driver.

Fix some white-space niggles.

Add cn_halt and cn_flush entries to consdevs.  (needed for dma-only console
devices).

Use aprint_*().

Catch up to -current

Fix signed/unsigned comparison warnings.

merge kqueue branch into -current

kqueue provides a stateful and efficient event notification framework
currently supported events include socket, file, directory, fifo,
pipe, tty and device changes, and monitoring of processes and signals

kqueue is supported by all writable filesystems in NetBSD tree
(with exception of Coda) and all device drivers supporting poll(2)

based on work done by Jonathan Lemon for FreeBSD
initial NetBSD port done by Luke Mewburn and Jason Thorpe

sync kqueue with -current; this includes merge of gehenna-devsw branch,
merge of i386 MP branch, and part of autoconf rototil work

Catch up to -current.

Merge the gehenna-devsw branch into the trunk.

This merge changes the device switch tables from static array to
dynamically generated by config(8).

- All device switches is defined as a constant structure in device drivers.

- The new grammer ``device-major'' is introduced to ``files''.

	device-major <prefix> char <num> [block <num>] [<rules>]

- All device major numbers must be listed up in port dependent majors.<arch>
  by using this grammer.

- Added the new naming convention.
  The name of the device switch must be <prefix>_[bc]devsw for auto-generation
  of device switch tables.

- The backward compatibility of loading block/character device
  switch by LKM framework is broken. This is necessary to convert
  from block/character device major to device name in runtime and vice versa.

- The restriction to assign device major by LKM is completely removed.
  We don't need to reserve LKM entries for dynamic loading of device switch.

- In compile time, device major numbers list is packed into the kernel and
  the LKM framework will refer it to assign device major number dynamically.

sync kqueue branch with HEAD

catch up with -current.

Catch up to -current.

Don't name parameters in a function declaration.

ANSIfy, KNF.

catch up with -current on kqueue branch

Add the character device switch.
Replace the access to devsw table with calling devsw API.

Catch up to -current.

PR/16058: Tero Kivinen: Don't free rbuf or detach tty if rbuf allocation
failed during attach phase.

* Add a new hwflag, COM_HW_NO_TXPRELOAD, which tells comstart() to
  not pre-load the chip's Tx buffer, but instead waits for the Tx Ready
  interrupt to transmit the first chunk of data.
* On the IOP310, set COM_HW_NO_TXPRELOAD, rather than COM_HW_TXFIFO_DISABLE.

This solves the "UART hangs" problem on the Npwr in a nicer way (i.e. we
get to use the FIFO, whee).  The COM_HW_NO_TXPRELOAD happens to match the
Linux 16550 driver's Tx algorithm, and the "UART hang" was never observed
on the Npwr running Linux.

Eventually, we might want to eliminate the COM_HW_NO_TXPRELOAD, and simply
always use its algorithm.  But it should be tested on more 16x50 variants
before we do that.

Kudos to Valeriy Ushakov <uwe@netbsd.org> for pointing out this solution
(which also happens to fix the stray UART interrupt issue on the Krups
Javastation), and to Allen Briggs <briggs@netbsd.org> for experimenting
with various methods of fixing this.