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5717a39a7a
freebsd-skq/sys/isa/sio.c
dg 5717a39a7a New interrupt code from Bruce Evans. In additional to Bruce's attached 
list of changes, I've made the following additional changes:

1) i386/include/ipl.h renamed to spl.h as the name conflicts with the
   file of the same name in i386/isa/ipl.h.
2) changed all use of *mask (i.e. netmask, biomask, ttymask, etc) to
   *_imask (net_imask, etc).
3) changed vestige of splnet use in if_is to splimp.
4) got rid of "impmask" completely (Bruce had gotten rid of netmask),
   and are now using net_imask instead.
5) dozens of minor cruft to glue in Bruce's changes.

   These require changes I made to config(8) as well, and thus it must
be rebuilt.

-DG

from Bruce Evans:

sio:
	o No diff is supplied.  Remove the define of setsofttty().  I hope
	  that is enough.

*.s:
	o i386/isa/debug.h no longer exists.  The event counters became too
	  much trouble to maintain.  All function call entry and exception
	  entry counters can be recovered by using profiling kernel (the new
	  profiling supports all entry points; however, it is too slow to
	  leave enabled all the time; it also).  Only BDBTRAP() from debug.h
	  is now used.  That is moved to exception.s.  It might be worth
	  preserving SHOW_BITS() and calling it from _mcount() (if enabled).
	o T_ASTFLT is now only set just before calling trap().
	o All exception handlers set SWI_AST_MASK in cpl as soon as possible
	  after entry and arrange for _doreti to restore it atomically with
	  exiting.  It is not possible to set it atomically with entering
	  the kernel, so it must be checked against the user mode bits in
	  the trap frame before committing to using it.  There is no place
	  to store the old value of cpl for syscalls or traps, so there are
	  some complications restoring it.

Profiling stuff (mostly in *.s):
	o Changes to kern/subr_mcount.c, gcc and gprof are not supplied yet.
	o All interesting labels `foo' are renamed `_foo' and all
	  uninteresting labels `_bar' are renamed `bar'.  A small change
	  to gprof allows ignoring labels not starting with underscores.
	o MCOUNT_LABEL() is to provide names for counters for times spent
	  in exception handlers.
	o FAKE_MCOUNT() is a version of MCOUNT() suitable for exception
	  handlers.  Its arg is the pc where the exception occurred.  The
	  new mcount() pretends that this was a call from that pc to a
	  suitable MCOUNT_LABEL().
	o MEXITCOUNT is to turn off any timer started by MCOUNT().

/usr/src/sys/i386/i386/exception.s:
	o The non-BDB BPTTRAP() macros were doing a sti even when interrupts
	  were disabled when the trap occurred.  The sti (fixed) sti is
	  actually a no-op unless you have my changes to machdep.c that make
	  the debugger trap gates interrupt gates, but fixing that would
	  make the ifdefs messier.  ddb seems to be unharmed by both
	  interrupts always disabled and always enabled (I had the branch in
	  the fix back to front for some time :-().
	o There is no known pushal bug.
	o tf_err can be left as garbage for syscalls.

/usr/src/sys/i386/i386/locore.s:
	o Fix and update BDE_DEBUGGER support.
	o ENTRY(btext) before initialization was dangerous.
	o Warm boot shot was longer than intended.

/usr/src/sys/i386/i386/machdep.c:
	o DON'T APPLY ALL OF THIS DIFF.  It's what I'm using, but may require
	  other changes.
	  Use the following:
		o Remove aston() and setsoftclock().
	  Maybe use the following:
		o No netisr.h.
		o Spelling fix.
		o Delay to read the Rebooting message.
		o Fix for vm system unmapping a reduced area of memory
		  after bounds_check_with_label() reduces the size of
		  a physical i/o for a partition boundary.  A similar
		  fix is required in kern_physio.c.
		o Correct use of __CONCAT.  It never worked here for non-
		  ANSI cpp's.  Is it time to drop support for non-ANSI?
		o gdt_segs init.  0xffffffffUL is bogus because ssd_limit
		  is not 32 bits.  The replacement may have the same
		  value :-), but is more natural.
		o physmem was one page too low.  Confusing variable names.
	  Don't use the following:
		o Better numbers of buffers.  Each 8K page requires up to
		  16 buffer headers.  On my system, this results in 5576
		  buffers containing [up to] 2854912 bytes of memory.
		  The usual allocation of about 384 buffers only holds
		  192K of disk if you use it on an fs with a block size
		  of 512.
		o gdt changes for bdb.
		o *TGT -> *IDT changes for bdb.
		o #ifdefed changes for bdb.

/usr/src/sys/i386/i386/microtime.s:
	o Use the correct asm macros.  I think asm.h was copied from Mach
	  just for microtime and isn't used now.  It certainly doesn't
	  belong in <sys>.  Various macros are also duplicated in
	  sys/i386/boot.h and libc/i386/*.h.
	o Don't switch to and from the IRR; it is guaranteed to be selected
	  (default after ICU init and explicitly selected in isa.c too, and
	  never changed until the old microtime clobbered it).

/usr/src/sys/i386/i386/support.s:
	o Non-essential changes (none related to spls or profiling).
	o Removed slow loads of %gs again.  The LDT support may require
	  not relying on %gs, but loading it is not the way to fix it!
	  Some places (copyin ...) forgot to load it.  Loading it clobbers
	  the user %gs.  trap() still loads it after certain types of
	  faults so that fuword() etc can rely on it without loading it
	  explicitly.  Exception handlers don't restore it.  If we want
	  to preserve the user %gs, then the fastest method is to not
	  touch it except for context switches.  Comparing with
	  VM_MAXUSER_ADDRESS and branching takes only 2 or 4 cycles on
	  a 486, while loading %gs takes 9 cycles and using it takes
	  another.
	o Fixed a signed branch to unsigned.

/usr/src/sys/i386/i386/swtch.s:
	o Move spl0() outside of idle loop.
	o Remove cli/sti from idle loop.  sw1 does a cli, and in the
	  unlikely event of an interrupt occurring and whichqs becoming
	  zero, sw1 will just jump back to _idle.
	o There's no spl0() function in asm any more, so use splz().
	o swtch() doesn't need to be superaligned, at least with the
	  new mcounting.
	o Fixed a signed branch to unsigned.
	o Removed astoff().

/usr/src/sys/i386/i386/trap.c:
	o The decentralized extern decls were inconsistent, of course.
	o Fixed typo MATH_EMULTATE in comments. */
	o Removed unused variables.
	o Old netmask is now impmask; print it instead.  Perhaps we
	  should print some of the new masks.
	o BTW, trap() should not print anything for normal debugger
	  traps.

/usr/src/sys/i386/include/asmacros.h:
	o DON'T APPLY ALL OF THIS DIFF.  Just use some of the null macros
	  as necessary.

/usr/src/sys/i386/include/cpu.h:
	o CLKF_BASEPRI() changes since cpl == SWI_AST_MASK is now normal
	  while the kernel is running.
	o Don't use var++ to set boolean variables.  It fails after a mere
	  4G times :-) and is slower than storing a constant on [3-4]86s.

/usr/src/sys/i386/include/cpufunc.h:
	o DON'T APPLY ALL OF THIS DIFF.  You need mainly the include of
	  <machine/ipl.h>.  Unfortunately, <machine/ipl.h> is needed by
	  almost everything for the inlines.

/usr/src/sys/i386/include/ipl.h:
	o New file.  Defines spl inlines and SWI macros and declares most
	  variables related to hard and soft interrupt masks.

/usr/src/sys/i386/isa/icu.h:
	o Moved definitions to <machine/ipl.h>

/usr/src/sys/i386/isa/icu.s:
	o Software interrupts (SWIs) and delayed hardware interrupts (HWIs)
	  are now handled uniformally, and dispatching them from splx() is
	  more like dispatching them from _doreti.  The dispatcher is
	  essentially *(handler[ffs(ipending & ~cpl)]().
	o More care (not quite enough) is taken to avoid unbounded nesting
	  of interrupts.
	o The interface to softclock() is changed so that a trap frame is
	  not required.
	o Fast interrupt handlers are now handled more uniformally.
	  Configuration is still too early (new handlers would require
	  bits in <machine/ipl.h> and functions to vector.s).
	o splnnn() and splx() are no longer here; they are inline functions
	  (could be macros for other compilers).  splz() is the nontrivial
	  part of the old splx().

/usr/src/sys/i386/isa/ipl.h
	o New file.  Supposed to have only bus-dependent stuff.  Perhaps
	  the h/w masks should be declared here.

/usr/src/sys/i386/isa/isa.c:
	o DON'T APPLY ALL OF THIS DIFF.  You need only things involving
	  *mask and *MASK and comments about them.  netmask is now a pure
	  software mask.  It works like the softclock mask.

/usr/src/sys/i386/isa/vector.s:
	o Reorganize AUTO_EOI* macros.
	o Option FAST_INTR_HANDLER_USERS_ES for people who don't trust
	  fastintr handlers.
	o fastintr handlers need to metamorphose into ordinary interrupt
	  handlers if their SWI bit has become set.  Previously, sio had
	  unintended latency for handling output completions and input
	  of SLIP framing characters because this was not done.

/usr/src/sys/net/netisr.h:
	o The machine-dependent stuff is now imported from <machine/ipl.h>.

/usr/src/sys/sys/systm.h
	o DON'T APPLY ALL OF THIS DIFF.  You need mainly the different
	  splx() prototype.  The spl*() prototypes are duplicated as
	  inlines in <machine/ipl.h> but they need to be duplicated here
	  in case there are no inlines.  I sent systm.h and cpufunc.h
	  to Garrett.  We agree that spl0 should be replaced by splnone
	  and not the other way around like I've done.

/usr/src/sys/kern/kern_clock.c
	o splsoftclock() now lowers cpl so the direct call to softclock()
	  works as intended.
	o softclock() interface changed to avoid passing the whole frame
	  (some machines may need another change for profile_tick()).
	o profiling renamed _profiling to avoid ANSI namespace pollution.
	  (I had to improve the mcount() interface and may as well fix it.)
	  The GUPROF variant doesn't actually reference profiling here,
	  but the 'U' in GUPROF should mean to select the microtimer
	  mcount() and not change the interface.
1994-04-02 07:00:53 +00:00

1803 lines
45 KiB
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/*-
* Copyright (c) 1991 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
* $Id: sio.c,v 1.41 1994/04/01 16:47:01 ache Exp $
*/
#include "sio.h"
#if NSIO > 0
/*
* Serial driver, based on 386BSD-0.1 com driver.
* Mostly rewritten to use pseudo-DMA.
* Works for National Semiconductor NS8250-NS16550AF UARTs.
* COM driver, based on HP dca driver.
*/
#include "param.h"
#include "systm.h"
#include "ioctl.h"
#include "tty.h"
#include "proc.h"
#include "user.h"
#include "conf.h"
#include "file.h"
#include "uio.h"
#include "kernel.h"
#include "syslog.h"
#include "i386/isa/isa.h"
#include "i386/isa/isa_device.h"
#include "i386/isa/comreg.h"
#include "i386/isa/ic/ns16550.h"
#define FAKE_DCD(unit) ((unit) == comconsole)
#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
#define RB_I_HIGH_WATER (RBSZ - 2 * RS_IBUFSIZE)
#define RB_I_LOW_WATER ((RBSZ - 2 * RS_IBUFSIZE) * 7 / 8)
#define RS_IBUFSIZE 256
#define TTY_BI TTY_FE /* XXX */
#define TTY_OE TTY_PE /* XXX */
#ifndef COM_BIDIR
#define UNIT(x) (minor(x)) /* XXX */
#else /* COM_BIDIR */
#define COM_UNITMASK 0x7f
#define COM_CALLOUTMASK 0x80 /* for both minor and dev */
#define UNIT(x) (minor(x) & COM_UNITMASK)
#define CALLOUT(x) (minor(x) & COM_CALLOUTMASK)
#endif /* COM_BIDIR */
#ifdef COM_MULTIPORT
/* checks in flags for multiport and which is multiport "master chip"
* for a given card
*/
#define COM_ISMULTIPORT(dev) ((dev)->id_flags & 0x01)
#define COM_MPMASTER(dev) (((dev)->id_flags >> 8) & 0x0ff)
#endif /* COM_MULTIPORT */
#define COM_NOFIFO(dev) ((dev)->id_flags & 0x02)
#ifndef FIFO_TRIGGER
/*
* This driver is fast enough to work with any value and for high values
* to be only slightly more efficient. Low values may be better because
* they give lower latency.
* TODO: always use low values for low speeds. Mouse movements are jerky
* if more than one packet arrives at once. The low speeds used for
* serial mice help avoid this, but not if (large) fifos are enabled.
*/
#define FIFO_TRIGGER FIFO_TRIGGER_14
#endif
#define com_scr 7 /* scratch register for 16450-16550 (R/W) */
/*
* Input buffer watermarks.
* The external device is asked to stop sending when the buffer exactly reaches
* high water, or when the high level requests it.
* The high level is notified immediately (rather than at a later clock tick)
* when this watermark is reached.
* The buffer size is chosen so the watermark should almost never be reached.
* The low watermark is invisibly 0 since the buffer is always emptied all at
* once.
*/
#define RS_IHIGHWATER (3 * RS_IBUFSIZE / 4)
/*
* com state bits.
* (CS_BUSY | CS_TTGO) and (CS_BUSY | CS_TTGO | CS_ODEVREADY) must be higher
* than the other bits so that they can be tested as a group without masking
* off the low bits.
*
* The following com and tty flags correspond closely:
* TS_BUSY = CS_BUSY (maintained by comstart() and comflush())
* CS_TTGO = ~TS_TTSTOP (maintained by comstart() and siostop())
* CS_CTS_OFLOW = CCTS_OFLOW (maintained by comparam())
* CS_RTS_IFLOW = CRTS_IFLOW (maintained by comparam())
* TS_FLUSH is not used.
* Bug: I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
*/
#define CS_BUSY 0x80 /* output in progress */
#define CS_TTGO 0x40 /* output not stopped by XOFF */
#define CS_ODEVREADY 0x20 /* external device h/w ready (CTS) */
#define CS_CHECKMSR 1 /* check of MSR scheduled */
#define CS_CTS_OFLOW 2 /* use CTS output flow control */
#define CS_ODONE 4 /* output completed */
#define CS_RTS_IFLOW 8 /* use RTS input flow control */
static char *error_desc[] = {
#define CE_OVERRUN 0
"silo overflow",
#define CE_INTERRUPT_BUF_OVERFLOW 1
"interrupt-level buffer overflow",
#define CE_TTY_BUF_OVERFLOW 2
"tty-level buffer overflow",
};
#define CE_NTYPES 3
#define CE_RECORD(com, errnum) (++(com)->delta_error_counts[errnum])
/* types. XXX - should be elsewhere */
typedef u_int Port_t; /* hardware port */
typedef u_char bool_t; /* boolean */
/* com device structure */
struct com_s {
u_char state; /* miscellaneous flag bits */
u_char cfcr_image; /* copy of value written to CFCR */
bool_t hasfifo; /* nonzero for 16550 UARTs */
u_char mcr_image; /* copy of value written to MCR */
#ifdef COM_BIDIR
bool_t bidir; /* is this unit bidirectional? */
bool_t active; /* is the port active _at all_? */
bool_t active_in; /* is the incoming port in use? */
bool_t active_out; /* is the outgoing port in use? */
#endif /* COM_BIDIR */
#ifdef COM_MULTIPORT
bool_t multiport; /* is this unit part of a multiport device? */
#endif /* COM_MULTIPORT */
int dtr_wait; /* time to hold DTR down on close (* 1/HZ) */
u_int tx_fifo_size;
/*
* The high level of the driver never reads status registers directly
* because there would be too many side effects to handle conveniently.
* Instead, it reads copies of the registers stored here by the
* interrupt handler.
*/
u_char last_modem_status; /* last MSR read by intr handler */
u_char prev_modem_status; /* last MSR handled by high level */
u_char *ibuf; /* start of input buffer */
u_char *ibufend; /* end of input buffer */
u_char *ihighwater; /* threshold in input buffer */
u_char *iptr; /* next free spot in input buffer */
u_char *obufend; /* end of output buffer */
int ocount; /* original count for current output */
u_char *optr; /* next char to output */
Port_t data_port; /* i/o ports */
Port_t int_id_port;
Port_t iobase;
Port_t modem_ctl_port;
Port_t line_status_port;
Port_t modem_status_port;
struct tty *tp; /* cross reference */
u_long bytes_in; /* statistics */
u_long bytes_out;
u_int delta_error_counts[CE_NTYPES];
u_int error_counts[CE_NTYPES];
/*
* Ping-pong input buffers. The extra factor of 2 in the sizes is
* to allow for an error byte for each input byte.
*/
#define CE_INPUT_OFFSET RS_IBUFSIZE
u_char ibuf1[2 * RS_IBUFSIZE];
u_char ibuf2[2 * RS_IBUFSIZE];
int do_timestamp;
struct timeval timestamp;
};
/*
* These functions in the com module ought to be declared (with a prototype)
* in a com-driver system header. The void ones may need to be int to match
* ancient devswitch declarations, but they don't actually return anything.
*/
#define Dev_t int /* promoted dev_t */
struct consdev;
int sioclose __P((Dev_t dev, int fflag, int devtype,
struct proc *p));
void siointr __P((int unit));
int sioioctl __P((Dev_t dev, int cmd, caddr_t data,
int fflag, struct proc *p));
int siocngetc __P((Dev_t dev));
void siocninit __P((struct consdev *cp));
void siocnprobe __P((struct consdev *cp));
void siocnputc __P((Dev_t dev, int c));
int sioopen __P((Dev_t dev, int oflags, int devtype,
struct proc *p));
void siopoll __P((void));
int sioread __P((Dev_t dev, struct uio *uio, int ioflag));
int sioselect __P((Dev_t dev, int rw, struct proc *p));
void siostop __P((struct tty *tp, int rw));
int siowrite __P((Dev_t dev, struct uio *uio, int ioflag));
void softsio1 __P((void));
static int sioattach __P((struct isa_device *dev));
static void comflush __P((struct com_s *com));
static void comhardclose __P((struct com_s *com));
static void cominit __P((int unit, int rate));
static void comintr1 __P((struct com_s *com));
static void commctl __P((struct com_s *com, int bits, int how));
static int comparam __P((struct tty *tp, struct termios *t));
static int sioprobe __P((struct isa_device *dev));
static void comstart __P((struct tty *tp));
static void comwakeup __P((caddr_t chan, int ticks));
static int tiocm_xxx2mcr __P((int tiocm_xxx));
/* table and macro for fast conversion from a unit number to its com struct */
static struct com_s *p_com_addr[NSIO];
#define com_addr(unit) (p_com_addr[unit])
static struct com_s com_structs[NSIO];
static struct timeval intr_timestamp;
struct isa_driver siodriver = {
sioprobe, sioattach, "sio"
};
#ifdef COMCONSOLE
static int comconsole = COMCONSOLE;
#else
static int comconsole = -1;
#endif
static bool_t comconsinit;
static speed_t comdefaultrate = TTYDEF_SPEED;
static u_int com_events; /* input chars + weighted output completions */
static int commajor;
struct tty *sio_tty[NSIO];
extern struct tty *constty;
extern u_int ipending; /* XXX */
extern int tk_nin; /* XXX */
extern int tk_rawcc; /* XXX */
#ifdef KGDB
#include "machine/remote-sl.h"
extern int kgdb_dev;
extern int kgdb_rate;
extern int kgdb_debug_init;
#endif
static struct speedtab comspeedtab[] = {
0, 0,
50, COMBRD(50),
75, COMBRD(75),
110, COMBRD(110),
134, COMBRD(134),
150, COMBRD(150),
200, COMBRD(200),
300, COMBRD(300),
600, COMBRD(600),
1200, COMBRD(1200),
1800, COMBRD(1800),
2400, COMBRD(2400),
4800, COMBRD(4800),
9600, COMBRD(9600),
19200, COMBRD(19200),
38400, COMBRD(38400),
57600, COMBRD(57600),
115200, COMBRD(115200),
-1, -1
};
/* XXX - configure this list */
static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
static int
sioprobe(dev)
struct isa_device *dev;
{
static bool_t already_init;
Port_t *com_ptr;
Port_t iobase;
int result;
if (!already_init) {
/*
* Turn off MCR_IENABLE for all likely serial ports. An unused
* port with its MCR_IENABLE gate open will inhibit interrupts
* from any used port that shares the interrupt vector.
*/
for (com_ptr = likely_com_ports;
com_ptr < &likely_com_ports[sizeof likely_com_ports
/ sizeof likely_com_ports[0]];
++com_ptr)
outb(*com_ptr + com_mcr, 0);
already_init = TRUE;
}
iobase = dev->id_iobase;
result = IO_COMSIZE;
/*
* We don't want to get actual interrupts, just masked ones.
* Interrupts from this line should already be masked in the ICU,
* but mask them in the processor as well in case there are some
* (misconfigured) shared interrupts.
*/
disable_intr();
/*
* Initialize the speed so that any junk in the THR or output fifo will
* be transmitted in a known time. (There may be lots of junk after a
* soft reboot, and output interrupts don't work right after a master
* reset, at least for 16550s. (The speed is undefined after MR, but
* MR empties the THR and the TSR so it's not clear why this matters)).
* Enable output interrupts (only) and check the following:
* o the CFCR, IER and MCR in UART hold the values written to them
* (the values happen to be all distinct - this is good for
* avoiding false positive tests from bus echoes).
* o an output interrupt is generated and its vector is correct.
* o the interrupt goes away when the IIR in the UART is read.
*/
outb(iobase + com_cfcr, CFCR_DLAB);
outb(iobase + com_dlbl, COMBRD(9600) & 0xff);
outb(iobase + com_dlbh, (u_int) COMBRD(9600) >> 8);
outb(iobase + com_cfcr, CFCR_8BITS); /* ensure IER is addressed */
outb(iobase + com_mcr, MCR_IENABLE); /* open gate early */
outb(iobase + com_ier, 0); /* ensure edge on next intr */
outb(iobase + com_ier, IER_ETXRDY); /* generate interrupt */
DELAY((16 + 1) * 9600 / 10); /* enough to drain 16 bytes */
if ( inb(iobase + com_cfcr) != CFCR_8BITS
|| inb(iobase + com_ier) != IER_ETXRDY
|| inb(iobase + com_mcr) != MCR_IENABLE
#ifndef COM_MULTIPORT /* XXX - need to do more to enable interrupts */
|| !isa_irq_pending(dev)
#endif
|| (inb(iobase + com_iir) & IIR_IMASK) != IIR_TXRDY
|| isa_irq_pending(dev)
|| !(inb(iobase + com_iir) & IIR_NOPEND))
result = 0;
/*
* Turn off all device interrupts and check that they go off properly.
* Leave MCR_IENABLE set. It gates the OUT2 output of the UART to
* the ICU input. Closing the gate would give a floating ICU input
* (unless there is another device driving at) and spurious interrupts.
* (On the system that this was first tested on, the input floats high
* and gives a (masked) interrupt as soon as the gate is closed.)
*/
outb(iobase + com_ier, 0);
outb(iobase + com_mcr, MCR_IENABLE); /* dummy to avoid bus echo */
if ( inb(iobase + com_ier) != 0
|| isa_irq_pending(dev)
|| !(inb(iobase + com_iir) & IIR_NOPEND))
result = 0;
if (result == 0)
outb(iobase + com_mcr, 0);
enable_intr();
return (result);
}
static int
sioattach(isdp)
struct isa_device *isdp;
{
struct com_s *com;
static bool_t comwakeup_started = FALSE;
Port_t iobase;
int s;
int unit;
iobase = isdp->id_iobase;
unit = isdp->id_unit;
if (unit == comconsole)
DELAY(1000); /* XXX */
s = spltty();
/*
* sioprobe() has initialized the device registers as follows:
* o cfcr = CFCR_8BITS.
* It is most important that CFCR_DLAB is off, so that the
* data port is not hidden when we enable interrupts.
* o ier = 0.
* Interrupts are only enabled when the line is open.
* o mcr = MCR_IENABLE.
* Keeping MCR_DTR and MCR_RTS off might stop the external
* device from sending before we are ready.
*/
com = &com_structs[unit];
com->cfcr_image = CFCR_8BITS;
com->mcr_image = MCR_IENABLE;
com->dtr_wait = 3 * hz;
com->tx_fifo_size = 1;
com->iptr = com->ibuf = com->ibuf1;
com->ibufend = com->ibuf1 + RS_IBUFSIZE;
com->ihighwater = com->ibuf1 + RS_IHIGHWATER;
com->iobase = iobase;
com->data_port = iobase + com_data;
com->int_id_port = iobase + com_iir;
com->modem_ctl_port = iobase + com_mcr;
com->line_status_port = iobase + com_lsr;
com->modem_status_port = iobase + com_msr;
com->tp = sio_tty[unit];
/* attempt to determine UART type */
printf("sio%d: type", unit);
#ifdef COM_MULTIPORT
if (!COM_ISMULTIPORT(isdp))
#endif
{
u_char scr;
u_char scr1;
u_char scr2;
scr = inb(iobase + com_scr);
outb(iobase + com_scr, 0xa5);
scr1 = inb(iobase + com_scr);
outb(iobase + com_scr, 0x5a);
scr2 = inb(iobase + com_scr);
outb(iobase + com_scr, scr);
if (scr1 != 0xa5 || scr2 != 0x5a) {
printf(" 8250");
goto determined_type;
}
}
outb(iobase + com_fifo, FIFO_ENABLE | FIFO_TRIGGER_14);
DELAY(100);
switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
case FIFO_TRIGGER_1:
printf(" 16450");
break;
case FIFO_TRIGGER_4:
printf(" 16450?");
break;
case FIFO_TRIGGER_8:
printf(" 16550?");
break;
case FIFO_TRIGGER_14:
printf(" 16550A");
if (COM_NOFIFO(isdp)) {
printf(" fifo software disabled");
} else {
com->hasfifo = TRUE;
com->tx_fifo_size = 16;
}
break;
}
outb(iobase + com_fifo, 0);
determined_type: ;
#ifdef COM_MULTIPORT
if (COM_ISMULTIPORT(isdp)) {
struct isa_device *masterdev;
com->multiport = TRUE;
printf(" (multiport)");
/* set the master's common-interrupt-enable reg.,
* as appropriate. YYY See your manual
*/
/* enable only common interrupt for port */
outb(com->modem_ctl_port, com->mcr_image = 0);
masterdev = find_isadev(isa_devtab_tty, &siodriver,
COM_MPMASTER(isdp));
outb(masterdev->id_iobase + com_scr, 0x80);
} else
com->multiport = FALSE;
#endif /* COM_MULTIPORT */
printf("\n");
#ifdef KGDB
if (kgdb_dev == makedev(commajor, unit)) {
if (comconsole == unit)
kgdb_dev = -1; /* can't debug over console port */
else {
cominit(unit, kgdb_rate);
if (kgdb_debug_init) {
/*
* Print prefix of device name,
* let kgdb_connect print the rest.
*/
printf("sio%d: ", unit);
kgdb_connect(1);
} else
printf("sio%d: kgdb enabled\n", unit);
}
}
#endif
/*
* Need to reset baud rate, etc. of next print so reset comconsinit.
*/
if (unit == comconsole)
comconsinit = FALSE;
com_addr(unit) = com;
splx(s);
if (!comwakeup_started) {
comwakeup((caddr_t) NULL, 0);
comwakeup_started = TRUE;
}
return (1);
}
/* ARGSUSED */
int
sioopen(dev, flag, mode, p)
dev_t dev;
int flag;
int mode;
struct proc *p;
{
#ifdef COM_BIDIR
bool_t callout;
#endif /* COM_BIDIR */
bool_t got_status = FALSE;
struct com_s *com;
int error = 0;
Port_t iobase;
int s;
struct tty *tp;
int unit;
unit = UNIT(dev);
if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL)
return (ENXIO);
#ifdef COM_BIDIR
/* if it's a callout device, and bidir not possible on that dev, die */
callout = CALLOUT(dev);
if (callout && !(com->bidir))
return (ENXIO);
#endif /* COM_BIDIR */
sio_tty[unit] = ttymalloc(sio_tty[unit]);
tp = com->tp = sio_tty[unit];
s = spltty();
#ifdef COM_BIDIR
bidir_open_top:
got_status = FALSE;
/* if it's bidirectional, we've gotta deal with it... */
if (com->bidir) {
if (callout) {
if (com->active_in) {
/* it's busy. die */
splx(s);
return (EBUSY);
} else {
/* it's ours. lock it down, and set it up */
com->active_out = TRUE;
}
} else {
if (com->active_out) {
/* it's busy, outgoing. wait, if possible */
if (flag & O_NONBLOCK) {
/* can't wait; bail */
splx(s);
return (EBUSY);
} else {
/* wait for it... */
error = tsleep((caddr_t)&com->active_out,
TTIPRI|PCATCH,
"siooth",
0);
/* if there was an error, take off. */
if (error != 0) {
splx(s);
return (error);
}
/* else take it from the top */
goto bidir_open_top;
}
}
disable_intr();
com->last_modem_status =
com->prev_modem_status = inb(com->modem_status_port);
enable_intr();
got_status = TRUE;
if (com->prev_modem_status & MSR_DCD
|| FAKE_DCD(unit)) {
/* there's a carrier on the line; we win */
com->active_in = TRUE;
} else {
/* there is no carrier on the line */
if (flag & O_NONBLOCK) {
/* can't wait; let it open */
com->active_in = TRUE;
} else {
/* put DTR & RTS up */
/* XXX - bring up RTS earlier? */
commctl(com, MCR_DTR | MCR_RTS, DMSET);
outb(com->iobase + com_ier, IER_EMSC);
/* wait for it... */
error = tsleep((caddr_t)&com->active_in,
TTIPRI|PCATCH,
"siodcd",
0);
/* if not active, turn intrs and DTR off */
if (!com->active) {
outb(com->iobase + com_ier, 0);
commctl(com, MCR_DTR, DMBIC);
}
/* if there was an error, take off. */
if (error != 0) {
splx(s);
return (error);
}
/* else take it from the top */
goto bidir_open_top;
}
}
}
}
com->active = TRUE;
#endif /* COM_BIDIR */
tp->t_oproc = comstart;
tp->t_param = comparam;
tp->t_dev = dev;
if (!(tp->t_state & TS_ISOPEN)) {
tp->t_state |= TS_WOPEN;
ttychars(tp);
if (tp->t_ispeed == 0) {
/*
* We no longer use the flags from <sys/ttydefaults.h>
* since those are only relevant for logins. It's
* important to have echo off initially so that the
* line doesn't start blathering before the echo flag
* can be turned off.
*/
tp->t_iflag = 0;
tp->t_oflag = 0;
#ifdef COMCONSOLE
if (unit == comconsole)
tp->t_oflag = TTYDEF_OFLAG;
#endif
tp->t_cflag = CREAD | CS8;
#ifdef COM_BIDIR
if (com->bidir && !callout)
tp->t_cflag |= HUPCL;
#endif
tp->t_lflag = 0;
tp->t_ispeed = tp->t_ospeed = comdefaultrate;
}
/*
* XXX the full state after a first open() needs to be
* programmable and separate for callin and callout.
*/
#ifdef COM_BIDIR
if (com->bidir) {
if (callout)
tp->t_cflag |= CLOCAL;
else
tp->t_cflag &= ~CLOCAL;
}
#endif
commctl(com, MCR_DTR | MCR_RTS, DMSET);
error = comparam(tp, &tp->t_termios);
if (error != 0)
goto out;
ttsetwater(tp);
iobase = com->iobase;
if (com->hasfifo) {
/* (re)enable and drain FIFO */
outb(iobase + com_fifo, FIFO_ENABLE | FIFO_TRIGGER
| FIFO_RCV_RST | FIFO_XMT_RST);
DELAY(100);
}
disable_intr();
(void) inb(com->line_status_port);
(void) inb(com->data_port);
if (!got_status)
com->last_modem_status =
com->prev_modem_status = inb(com->modem_status_port);
outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS
| IER_EMSC);
enable_intr();
if (com->prev_modem_status & MSR_DCD || FAKE_DCD(unit))
tp->t_state |= TS_CARR_ON;
} else if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0) {
splx(s);
return (EBUSY);
}
while (!(flag & O_NONBLOCK) && !(tp->t_cflag & CLOCAL)
#ifdef COM_BIDIR
/* We went through a lot of trouble to open it,
* but it's certain we have a carrier now, so
* don't spend any time on it now.
*/
&& !(com->bidir)
#endif /* COM_BIDIR */
&& !(tp->t_state & TS_CARR_ON)) {
tp->t_state |= TS_WOPEN;
error = ttysleep(tp, (caddr_t)tp->t_raw, TTIPRI | PCATCH,
ttopen, 0);
if (error != 0)
break;
}
out:
if (error == 0)
error = (*linesw[tp->t_line].l_open)(dev, tp, 0);
splx(s);
#ifdef COM_BIDIR
/* wakeup sleepers */
wakeup((caddr_t) &com->active_in);
#endif /* COM_BIDIR */
/*
* XXX - the next step was once not done, so interrupts, DTR and RTS
* remained hot if the process was killed while it was sleeping
* waiting for carrier. Now there is the opposite problem. If several
* processes are sleeping waiting for carrier on the same line and one
* is killed, interrupts are turned off so the other processes will
* never see the carrier rise.
*/
if (error != 0 && !(tp->t_state & TS_ISOPEN))
comhardclose(com);
tp->t_state &= ~TS_WOPEN;
return (error);
}
/*ARGSUSED*/
int
sioclose(dev, flag, mode, p)
dev_t dev;
int flag;
int mode;
struct proc *p;
{
struct com_s *com;
struct tty *tp;
int s;
com = com_addr(UNIT(dev));
tp = com->tp;
s = spltty();
(*linesw[tp->t_line].l_close)(tp, flag);
siostop(tp, FREAD|FWRITE);
comhardclose(com);
ttyclose(tp);
splx(s);
return (0);
}
static void
comhardclose(com)
struct com_s *com;
{
Port_t iobase;
int s;
struct tty *tp;
int unit;
s = spltty();
iobase = com->iobase;
com->do_timestamp = 0;
outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
unit = com - &com_structs[0];
#ifdef KGDB
/* do not disable interrupts or hang up if debugging */
if (kgdb_dev != makedev(commajor, unit))
#endif
{
outb(iobase + com_ier, 0);
tp = com->tp;
if (tp->t_cflag & HUPCL || tp->t_state & TS_WOPEN
#ifdef COM_BIDIR
|| com->active_in
&& !(com->prev_modem_status & MSR_DCD) && !FAKE_DCD(unit)
#endif
|| !(tp->t_state & TS_ISOPEN)) {
commctl(com, MCR_RTS, DMSET);
if (com->dtr_wait != 0)
/*
* Uninterruptible sleep since we want to
* wait a fixed time.
* XXX - delay in open() (if necessary),
* not here (always).
*/
tsleep((caddr_t)&com->dtr_wait, TTIPRI,
"sioclose", com->dtr_wait);
}
}
#ifdef COM_BIDIR
com->active = com->active_in = com->active_out = FALSE;
/* wakeup sleepers who are waiting for out to finish */
wakeup((caddr_t) &com->active_out);
#endif /* COM_BIDIR */
splx(s);
}
int
sioread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
struct tty *tp = com_addr(UNIT(dev))->tp;
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
int
siowrite(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int unit = UNIT(dev);
struct tty *tp = com_addr(unit)->tp;
/*
* (XXX) We disallow virtual consoles if the physical console is
* a serial port. This is in case there is a display attached that
* is not the console. In that situation we don't need/want the X
* server taking over the console.
*/
if (constty && unit == comconsole)
constty = NULL;
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
/* Interrupt routine for timekeeping purposes */
void
siointrts(int unit)
{
microtime(&intr_timestamp);
siointr(unit);
}
void
siointr(unit)
int unit;
{
struct com_s *com;
#ifndef COM_MULTIPORT
com = com_addr(unit);
if (com != NULL)
comintr1(com);
#else /* COM_MULTIPORT */
bool_t possibly_more_intrs;
/*
* Loop until there is no activity on any port. This is necessary
* to get an interrupt edge more than to avoid another interrupt.
* If the IRQ signal is just an OR of the IRQ signals from several
* devices, then the edge from one may be lost because another is
* on.
*/
do {
possibly_more_intrs = FALSE;
for (unit = 0; unit < NSIO; ++unit) {
com = com_addr(unit);
if (com != NULL
&& !(inb(com->int_id_port) & IIR_NOPEND)) {
/*
* XXX call comintr1() instead of here from
* comwakeup(). The interrupt edge problem
* only exists for real interrupts.
*/
comintr1(com);
possibly_more_intrs = TRUE;
}
}
} while (possibly_more_intrs);
#endif /* COM_MULTIPORT */
}
static void
comintr1(com)
struct com_s *com;
{
u_char line_status;
u_char modem_status;
u_char *ioptr;
u_char recv_data;
if(com->do_timestamp)
com->timestamp = intr_timestamp;
while (TRUE) {
line_status = inb(com->line_status_port);
/* input event? (check first to help avoid overruns) */
while (line_status & LSR_RCV_MASK) {
/* break/unnattached error bits or real input? */
if (!(line_status & LSR_RXRDY))
recv_data = 0;
else
recv_data = inb(com->data_port);
++com->bytes_in;
#ifdef KGDB
/* trap into kgdb? (XXX - needs testing and optim) */
if (recv_data == FRAME_END
&& !(com->tp->t_state & TS_ISOPEN)
&& kgdb_dev == makedev(commajor, unit)) {
kgdb_connect(0);
continue;
}
#endif /* KGDB */
ioptr = com->iptr;
if (ioptr >= com->ibufend)
CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
else {
++com_events;
#if 0 /* for testing input latency vs efficiency */
if (com->iptr - com->ibuf == 8)
setsofttty();
#endif
ioptr[0] = recv_data;
ioptr[CE_INPUT_OFFSET] = line_status;
com->iptr = ++ioptr;
if (ioptr == com->ihighwater
&& com->state & CS_RTS_IFLOW)
outb(com->modem_ctl_port,
com->mcr_image &= ~MCR_RTS);
/* XXX - move this out of isr */
if (line_status & LSR_OE)
CE_RECORD(com, CE_OVERRUN);
}
/*
* "& 0x7F" is to avoid the gcc-1.40 generating a slow
* jump from the top of the loop to here
*/
line_status = inb(com->line_status_port) & 0x7F;
}
/* modem status change? (always check before doing output) */
modem_status = inb(com->modem_status_port);
if (modem_status != com->last_modem_status) {
/*
* Schedule high level to handle DCD changes. Note
* that we don't use the delta bits anywhere. Some
* UARTs mess them up, and it's easy to remember the
* previous bits and calculate the delta.
*/
com->last_modem_status = modem_status;
if (!(com->state & CS_CHECKMSR)) {
com_events += LOTS_OF_EVENTS;
com->state |= CS_CHECKMSR;
setsofttty();
}
/* handle CTS change immediately for crisp flow ctl */
if (com->state & CS_CTS_OFLOW) {
if (modem_status & MSR_CTS)
com->state |= CS_ODEVREADY;
else
com->state &= ~CS_ODEVREADY;
}
}
/* output queued and everything ready? */
if (line_status & LSR_TXRDY
&& com->state >= (CS_ODEVREADY | CS_BUSY | CS_TTGO)) {
ioptr = com->optr;
if (com->tx_fifo_size > 1) {
u_int ocount;
ocount = com->obufend - ioptr;
if (ocount > com->tx_fifo_size)
ocount = com->tx_fifo_size;
com->bytes_out += ocount;
do
outb(com->data_port, *ioptr++);
while (--ocount != 0);
} else {
outb(com->data_port, *ioptr++);
++com->bytes_out;
}
com->optr = ioptr;
if (ioptr >= com->obufend) {
/* output just completed */
com_events += LOTS_OF_EVENTS;
com->state ^= (CS_ODONE | CS_BUSY);
setsofttty(); /* handle at high level ASAP */
}
}
/* finished? */
#ifndef COM_MULTIPORT
if (inb(com->int_id_port) & IIR_NOPEND)
#endif /* COM_MULTIPORT */
return;
}
}
static int
tiocm_xxx2mcr(tiocm_xxx)
int tiocm_xxx;
{
int mcr;
mcr = 0;
if (tiocm_xxx & TIOCM_DTR)
mcr |= MCR_DTR;
if (tiocm_xxx & TIOCM_RTS)
mcr |= MCR_RTS;
return (mcr);
}
int
sioioctl(dev, cmd, data, flag, p)
dev_t dev;
int cmd;
caddr_t data;
int flag;
struct proc *p;
{
struct com_s *com;
int error;
Port_t iobase;
int mcr;
int msr;
int s;
int tiocm_xxx;
struct tty *tp;
com = com_addr(UNIT(dev));
tp = com->tp;
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag);
if (error >= 0)
return (error);
error = ttioctl(tp, cmd, data, flag);
#ifdef COM_BIDIR
/* XXX: plug security hole while sticky bits not yet implemented */
if (com->bidir && com->active_in && p->p_ucred->cr_uid != 0)
tp->t_cflag &= ~CLOCAL;
#endif
if (error >= 0)
return (error);
iobase = com->iobase;
s = spltty();
switch (cmd) {
case TIOCSBRK:
outb(iobase + com_cfcr, com->cfcr_image |= CFCR_SBREAK);
break;
case TIOCCBRK:
outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
break;
case TIOCSDTR:
commctl(com, MCR_DTR, DMBIS);
break;
case TIOCCDTR:
commctl(com, MCR_DTR, DMBIC);
break;
case TIOCMSET:
commctl(com, tiocm_xxx2mcr(*(int *)data), DMSET);
break;
case TIOCMBIS:
commctl(com, tiocm_xxx2mcr(*(int *)data), DMBIS);
break;
case TIOCMBIC:
commctl(com, tiocm_xxx2mcr(*(int *)data), DMBIC);
break;
case TIOCMGET:
tiocm_xxx = TIOCM_LE; /* XXX - always enabled while open */
mcr = com->mcr_image;
if (mcr & MCR_DTR)
tiocm_xxx |= TIOCM_DTR;
if (mcr & MCR_RTS)
tiocm_xxx |= TIOCM_RTS;
msr = com->prev_modem_status;
if (msr & MSR_CTS)
tiocm_xxx |= TIOCM_CTS;
if (msr & MSR_DCD)
tiocm_xxx |= TIOCM_CD;
if (msr & MSR_DSR)
tiocm_xxx |= TIOCM_DSR;
/*
* XXX - MSR_RI is naturally volatile, and we make MSR_TERI
* more volatile by reading the modem status a lot. Perhaps
* we should latch both bits until the status is read here.
*/
if (msr & (MSR_RI | MSR_TERI))
tiocm_xxx |= TIOCM_RI;
*(int *)data = tiocm_xxx;
break;
#ifdef COM_BIDIR
case TIOCMSBIDIR:
/* must be root to set bidir. capability */
error = suser(p->p_ucred, &p->p_acflag);
if (error != 0) {
splx(s);
return(EPERM);
}
/* if it's the console, can't do it (XXX why?) */
if (UNIT(dev) == comconsole) {
splx(s);
return(ENOTTY);
}
#if 0
/* XXX - can't do the next, for obvious reasons...
* but there are problems to be looked at...
*/
/* if the port is active, don't do it */
if (com->active) {
splx(s);
return(EBUSY);
}
#endif
com->bidir = *(int *)data;
break;
case TIOCMGBIDIR:
*(int *)data = com->bidir;
break;
#endif /* COM_BIDIR */
case TIOCMSDTRWAIT:
/* must be root since the wait applies to following logins */
error = suser(p->p_ucred, &p->p_acflag);
if (error != 0) {
splx(s);
return(EPERM);
}
/* if it's the console, can't do it (XXX why?) */
if (UNIT(dev) == comconsole) {
splx(s);
return(ENOTTY);
}
com->dtr_wait = *(int *)data;
break;
case TIOCMGDTRWAIT:
*(int *)data = com->dtr_wait;
break;
case TIOCTIMESTAMP:
com->do_timestamp = 1;
*(struct timeval *)data = com->timestamp;
break;
default:
splx(s);
return (ENOTTY);
}
splx(s);
return (0);
}
/* cancel pending output */
static void
comflush(com)
struct com_s *com;
{
struct ringb *rbp;
disable_intr();
if (com->state & CS_ODONE)
com_events -= LOTS_OF_EVENTS;
com->state &= ~(CS_ODONE | CS_BUSY);
enable_intr();
rbp = com->tp->t_out;
rbp->rb_hd += com->ocount;
rbp->rb_hd = RB_ROLLOVER(rbp, rbp->rb_hd);
com->ocount = 0;
com->tp->t_state &= ~TS_BUSY;
}
void
siopoll()
{
static bool_t awake = FALSE;
int s;
int unit;
if (com_events == 0)
return;
disable_intr();
if (awake) {
enable_intr();
return;
}
awake = TRUE;
enable_intr();
s = spltty();
repeat:
for (unit = 0; unit < NSIO; ++unit) {
u_char *buf;
struct com_s *com;
u_char *ibuf;
int incc;
struct tty *tp;
com = com_addr(unit);
if (com == NULL)
continue;
tp = com->tp;
/* switch the role of the low-level input buffers */
if (com->iptr == (ibuf = com->ibuf)) {
buf = NULL; /* not used, but compiler can't tell */
incc = 0;
} else {
buf = ibuf;
disable_intr();
incc = com->iptr - buf;
com_events -= incc;
if (ibuf == com->ibuf1)
ibuf = com->ibuf2;
else
ibuf = com->ibuf1;
com->ibufend = ibuf + RS_IBUFSIZE;
com->ihighwater = ibuf + RS_IHIGHWATER;
com->iptr = ibuf;
/*
* There is now room for another low-level buffer full
* of input, so enable RTS if it is now disabled and
* there is room in the high-level buffer.
*/
if ((com->state & CS_RTS_IFLOW)
&& !(com->mcr_image & MCR_RTS)
&& !(tp->t_state & TS_RTS_IFLOW))
outb(com->modem_ctl_port,
com->mcr_image |= MCR_RTS);
enable_intr();
com->ibuf = ibuf;
}
if (com->state & CS_CHECKMSR) {
u_char delta_modem_status;
disable_intr();
delta_modem_status = com->last_modem_status
^ com->prev_modem_status;
com->prev_modem_status = com->last_modem_status;
com_events -= LOTS_OF_EVENTS;
com->state &= ~CS_CHECKMSR;
enable_intr();
if (delta_modem_status & MSR_DCD && !FAKE_DCD(unit)) {
if (com->prev_modem_status & MSR_DCD) {
(*linesw[tp->t_line].l_modem)(tp, 1);
#ifdef COM_BIDIR
wakeup((caddr_t) &com->active_in);
#endif /* COM_BIDIR */
} else
(*linesw[tp->t_line].l_modem)(tp, 0);
}
}
/* XXX */
if (TRUE) {
u_int delta;
int errnum;
u_long total;
for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
disable_intr();
delta = com->delta_error_counts[errnum];
com->delta_error_counts[errnum] = 0;
enable_intr();
if (delta != 0) {
total =
com->error_counts[errnum] += delta;
log(LOG_WARNING,
"sio%d: %u more %s%s (total %lu)\n",
unit, delta, error_desc[errnum],
delta == 1 ? "" : "s", total);
}
}
}
if (com->state & CS_ODONE) {
comflush(com);
/* XXX - why isn't the table used for t_line == 0? */
if (tp->t_line != 0)
(*linesw[tp->t_line].l_start)(tp);
else
comstart(tp);
}
if (incc <= 0 || !(tp->t_state & TS_ISOPEN))
continue;
if (com->state & CS_RTS_IFLOW
&& RB_LEN(tp->t_raw) + incc >= RB_I_HIGH_WATER
&& !(tp->t_state & TS_RTS_IFLOW)
/*
* XXX - need RTS flow control for all line disciplines.
* Only have it in standard one now.
*/
&& linesw[tp->t_line].l_rint == ttyinput) {
tp->t_state |= TS_RTS_IFLOW;
ttstart(tp);
}
/*
* Avoid the grotesquely inefficient lineswitch routine
* (ttyinput) in "raw" mode. It usually takes about 450
* instructions (that's without canonical processing or echo!).
* slinput is reasonably fast (usually 40 instructions plus
* call overhead).
*/
if (!(tp->t_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP
| IXOFF | IXON))
&& !(tp->t_lflag & (ECHO | ECHONL | ICANON | IEXTEN | ISIG
| PENDIN))
&& !(tp->t_state & (TS_CNTTB | TS_LNCH))
&& linesw[tp->t_line].l_rint == ttyinput) {
tk_nin += incc;
tk_rawcc += incc;
tp->t_rawcc += incc;
com->delta_error_counts[CE_TTY_BUF_OVERFLOW]
+= incc - rb_write(tp->t_raw, (char *) buf,
incc);
ttwakeup(tp);
if (tp->t_state & TS_TTSTOP
&& (tp->t_iflag & IXANY
|| tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
tp->t_state &= ~TS_TTSTOP;
tp->t_lflag &= ~FLUSHO;
ttstart(tp);
}
} else {
do {
u_char line_status;
int recv_data;
line_status = (u_char) buf[CE_INPUT_OFFSET];
recv_data = (u_char) *buf++;
if (line_status
& (LSR_BI | LSR_FE | LSR_OE | LSR_PE)) {
if (line_status & LSR_BI)
recv_data |= TTY_BI;
if (line_status & LSR_FE)
recv_data |= TTY_FE;
if (line_status & LSR_OE)
recv_data |= TTY_OE;
if (line_status & LSR_PE)
recv_data |= TTY_PE;
}
(*linesw[tp->t_line].l_rint)(recv_data, tp);
} while (--incc > 0);
}
if (com_events == 0)
break;
}
if (com_events >= LOTS_OF_EVENTS)
goto repeat;
splx(s);
awake = FALSE;
}
static int
comparam(tp, t)
struct tty *tp;
struct termios *t;
{
u_int cfcr;
int cflag;
struct com_s *com;
int divisor;
int error;
Port_t iobase;
int s;
int unit;
/* check requested parameters */
divisor = ttspeedtab(t->c_ospeed, comspeedtab);
if (t->c_ispeed == 0)
t->c_ispeed = t->c_ospeed;
if (divisor < 0 || t->c_ispeed != t->c_ospeed)
return (EINVAL);
/* parameters are OK, convert them to the com struct and the device */
unit = UNIT(tp->t_dev);
com = com_addr(unit);
iobase = com->iobase;
s = spltty();
if (divisor == 0)
commctl(com, MCR_DTR, DMBIC); /* hang up line */
else
commctl(com, MCR_DTR, DMBIS);
cflag = t->c_cflag;
switch (cflag & CSIZE) {
case CS5:
cfcr = CFCR_5BITS;
break;
case CS6:
cfcr = CFCR_6BITS;
break;
case CS7:
cfcr = CFCR_7BITS;
break;
default:
cfcr = CFCR_8BITS;
break;
}
if (cflag & PARENB) {
cfcr |= CFCR_PENAB;
if (!(cflag & PARODD))
cfcr |= CFCR_PEVEN;
}
if (cflag & CSTOPB)
cfcr |= CFCR_STOPB;
/*
* Some UARTs lock up if the divisor latch registers are selected
* while the UART is doing output (they refuse to transmit anything
* more until given a hard reset). Fix this by stopping filling
* the device buffers and waiting for them to drain. Reading the
* line status port outside of siointr() might lose some receiver
* error bits, but that is acceptable here.
*/
disable_intr();
retry:
com->state &= ~CS_TTGO;
enable_intr();
while ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
!= (LSR_TSRE | LSR_TXRDY)) {
error = ttysleep(tp, (caddr_t)tp->t_raw, TTIPRI | PCATCH,
"sioparam", 1);
if (error != 0 && error != EAGAIN) {
if (!(tp->t_state & TS_TTSTOP)) {
disable_intr();
com->state |= CS_TTGO;
enable_intr();
}
splx(s);
return (error);
}
}
disable_intr(); /* very important while com_data is hidden */
/*
* XXX - clearing CS_TTGO is not sufficient to stop further output,
* because siopoll() calls comstart() which usually sets it again
* because TS_TTSTOP is clear. Setting TS_TTSTOP would not be
* sufficient, for similar reasons.
*/
if ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
!= (LSR_TSRE | LSR_TXRDY))
goto retry;
if (divisor != 0) {
outb(iobase + com_cfcr, cfcr | CFCR_DLAB);
outb(iobase + com_dlbl, divisor & 0xFF);
outb(iobase + com_dlbh, (u_int) divisor >> 8);
}
outb(iobase + com_cfcr, com->cfcr_image = cfcr);
if (!(tp->t_state & TS_TTSTOP))
com->state |= CS_TTGO;
if (cflag & CRTS_IFLOW)
com->state |= CS_RTS_IFLOW; /* XXX - secondary changes? */
else
com->state &= ~CS_RTS_IFLOW;
/*
* Set up state to handle output flow control.
* XXX - worth handling MDMBUF (DCD) flow control at the lowest level?
* Now has 16+ msec latency, while CTS flow has 50- usec latency.
*/
com->state &= ~CS_CTS_OFLOW;
com->state |= CS_ODEVREADY;
if (cflag & CCTS_OFLOW) {
com->state |= CS_CTS_OFLOW;
if (!(com->last_modem_status & MSR_CTS))
com->state &= ~CS_ODEVREADY;
}
/*
* Recover from fiddling with CS_TTGO. We used to call siointr()
* unconditionally, but that defeated the careful discarding of
* stale input in sioopen().
*
* XXX sioopen() is not careful waiting for carrier for the callout
* case.
*/
if (com->state >= (CS_BUSY | CS_TTGO))
comintr1(com);
enable_intr();
splx(s);
return (0);
}
static void
comstart(tp)
struct tty *tp;
{
struct com_s *com;
int s;
int unit;
unit = UNIT(tp->t_dev);
com = com_addr(unit);
s = spltty();
disable_intr();
if (tp->t_state & TS_TTSTOP)
com->state &= ~CS_TTGO;
else
com->state |= CS_TTGO;
if (tp->t_state & TS_RTS_IFLOW) {
if (com->mcr_image & MCR_RTS && com->state & CS_RTS_IFLOW)
outb(com->modem_ctl_port, com->mcr_image &= ~MCR_RTS);
} else {
if (!(com->mcr_image & MCR_RTS) && com->iptr < com->ihighwater)
outb(com->modem_ctl_port, com->mcr_image |= MCR_RTS);
}
enable_intr();
if (tp->t_state & (TS_TIMEOUT | TS_TTSTOP))
goto out;
if (RB_LEN(tp->t_out) <= tp->t_lowat) {
if (tp->t_state & TS_ASLEEP) {
tp->t_state &= ~TS_ASLEEP;
wakeup((caddr_t)tp->t_out);
}
if (tp->t_wsel) {
selwakeup(tp->t_wsel, tp->t_state & TS_WCOLL);
tp->t_wsel = 0;
tp->t_state &= ~TS_WCOLL;
}
}
if (com->ocount != 0) {
disable_intr();
comintr1(com);
enable_intr();
} else if (RB_LEN(tp->t_out) != 0) {
tp->t_state |= TS_BUSY;
com->ocount = RB_CONTIGGET(tp->t_out);
disable_intr();
com->obufend = (com->optr = (u_char *) tp->t_out->rb_hd)
+ com->ocount;
com->state |= CS_BUSY;
comintr1(com); /* fake interrupt to start output */
enable_intr();
}
out:
splx(s);
}
void
siostop(tp, rw)
struct tty *tp;
int rw;
{
struct com_s *com;
com = com_addr(UNIT(tp->t_dev));
if (rw & FWRITE)
comflush(com);
disable_intr();
if (rw & FREAD) {
com_events -= (com->iptr - com->ibuf);
com->iptr = com->ibuf;
}
if (tp->t_state & TS_TTSTOP)
com->state &= ~CS_TTGO;
else
com->state |= CS_TTGO;
enable_intr();
}
int
sioselect(dev, rw, p)
dev_t dev;
int rw;
struct proc *p;
{
#ifdef COM_BIDIR
return ttselect(dev & ~COM_CALLOUTMASK, rw, p);
#else
return ttselect(dev, rw, p);
#endif
}
static void
commctl(com, bits, how)
struct com_s *com;
int bits;
int how;
{
disable_intr();
switch (how) {
case DMSET:
outb(com->modem_ctl_port,
com->mcr_image = bits | (com->mcr_image & MCR_IENABLE));
break;
case DMBIS:
outb(com->modem_ctl_port, com->mcr_image |= bits);
break;
case DMBIC:
outb(com->modem_ctl_port, com->mcr_image &= ~bits);
break;
}
enable_intr();
}
static void
comwakeup(chan, ticks)
caddr_t chan;
int ticks;
{
int unit;
timeout(comwakeup, (caddr_t) NULL, hz / 100);
if (com_events != 0)
/* schedule siopoll() to run when the cpl allows */
setsofttty();
/* recover from lost output interrupts */
for (unit = 0; unit < NSIO; ++unit) {
struct com_s *com;
com = com_addr(unit);
if (com != NULL && com->state >= (CS_BUSY | CS_TTGO)) {
disable_intr();
comintr1(com);
enable_intr();
}
}
return;
}
void
softsio1()
{
siopoll();
}
/*
* Following are all routines needed for SIO to act as console
* XXX - not tested in this version
* XXX - i386/cons.c only knows about the com driver (NCOM and not NSIO)
* XXX - check that the corresponding serial interrupts are never enabled
*/
#include "i386/i386/cons.h"
void
siocnprobe(cp)
struct consdev *cp;
{
int unit;
/* locate the major number */
for (commajor = 0; commajor < nchrdev; commajor++)
if (cdevsw[commajor].d_open == sioopen)
break;
/* XXX: ick */
unit = UNIT(CONUNIT);
com_addr(unit) = &com_structs[unit];
com_addr(unit)->iobase = CONADDR;
/* make sure hardware exists? XXX */
/* initialize required fields */
cp->cn_dev = makedev(commajor, unit);
#ifdef COMCONSOLE
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
#else
cp->cn_pri = CN_NORMAL;
#endif
}
void
siocninit(cp)
struct consdev *cp;
{
int unit;
unit = UNIT(cp->cn_dev);
cominit(unit, comdefaultrate);
comconsole = unit;
comconsinit = TRUE;
}
static void
cominit(unit, rate)
int unit;
int rate;
{
Port_t iobase;
int s;
iobase = com_addr(unit)->iobase;
s = splhigh();
outb(iobase + com_cfcr, CFCR_DLAB);
rate = ttspeedtab(comdefaultrate, comspeedtab);
outb(iobase + com_dlbl, rate & 0xFF);
outb(iobase + com_dlbh, rate >> 8);
outb(iobase + com_cfcr, CFCR_8BITS);
outb(iobase + com_fifo,
FIFO_ENABLE | FIFO_TRIGGER | FIFO_RCV_RST | FIFO_XMT_RST);
DELAY(100);
(void) inb(iobase + com_lsr);
(void) inb(iobase + com_data);
(void) inb(iobase + com_msr);
/*
* XXX - fishy to enable interrupts and then poll.
* It shouldn't be necessary to ready the iir.
*/
outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS | IER_EMSC);
(void) inb(iobase + com_iir);
splx(s);
}
int
siocngetc(dev)
dev_t dev;
{
int c;
Port_t iobase;
int s;
iobase = com_addr(UNIT(dev))->iobase;
s = splhigh();
while (!(inb(iobase + com_lsr) & LSR_RXRDY))
;
c = inb(iobase + com_data);
(void) inb(iobase + com_iir);
splx(s);
return (c);
}
void
siocnputc(dev, c)
dev_t dev;
int c;
{
Port_t iobase;
int s;
int timo;
iobase = com_addr(UNIT(dev))->iobase;
s = splhigh();
#ifdef KGDB
if (dev != kgdb_dev)
#endif
if (!comconsinit) {
cominit(UNIT(dev), comdefaultrate);
comconsinit = TRUE;
}
/* wait for any pending transmission to finish */
timo = 50000;
while (!(inb(iobase + com_lsr) & LSR_TXRDY) && --timo)
;
outb(iobase + com_data, c);
/* wait for this transmission to complete */
timo = 1500000;
while (!(inb(iobase + com_lsr) & LSR_TXRDY) && --timo)
;
/* clear any interrupts generated by this transmission */
(void) inb(iobase + com_iir);
splx(s);
}
#endif /* NSIO > 0 */
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