* 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.
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.
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.
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
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.
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.
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.
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
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.
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.
indicating an unhandled "command". ERESTART is -1, which can lead to
confusion. ERESTART has been moved to -3 and EPASSTHROUGH has been
placed at -4. No ioctl code should now return -1 anywhere. The
ioctl() system call is now properly restartable.
- replace opt_kgdb_machdep.h with opt_kgdb.h
- defparam opt_kgdb.h:
KGDB_DEV KGDB_DEVNAME KGDB_DEVADDR KGDB_DEVRATE KGDB_DEVMODE
- move from opt_ddbparam.h to opt_ddb.h:
DDB_FROMCONSOLE DDB_ONPANIC DDB_HISTORY_SIZE DDB_BREAK_CHAR SYMTAB_SPACE
- replace KGDBDEV with KGDB_DEV
- replace KGDBADDR with KGDB_DEVADDR
- replace KGDBMODE with KGDB_DEVMODE
- replace KGDBRATE with KGDB_DEVRATE
- use `9600' instead of `0x2580' for 9600 baud rate
- use correct quotes for options KGDB_DEVNAME="\"com\""
- use correct quotes for options KGDB_DEV="17*256+0"
- remove unnecessary dependancy on Makefile for kgdb_stub.o
- minor whitespace cleanup
IIR_NOPEND if the TXRDY condition is true. Apparently, other chips do
not take TXRDY into account in the IIR_NOPEND case.
Also remove useless assignment (iir = IIR_NOPEND;) in one case.
No response from patch posted on tech-kern 29Aug2001.
- cominit() is local to com.c, remove prototype from comvar.h.
- Don't prototype comstop(), cdev_decl(com) does this.
- Don't use a block device switch table declaration(!).
- No need to include "com.h".
and place the definition in <machine/types.h>. This can now be used
as a flag to indicate whether or not <machine/intr.h> can be included
to get the generic soft interrupt API.
(comsoft() can be invoked before comopen() on serial consoles; a character
received before the console is opened "for real" can result in a fatal trap
unless the ring buffer pointers are initialized early)
mycroft