879d1ff90a
yet not implemented. Only for bidirectional case.
1771 lines
44 KiB
C
1771 lines
44 KiB
C
/*-
|
|
* 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 1.20 1993/12/16 04:38:27 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
|
|
#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_scr 7 /* scratch register for 16450-16550 (R/W) */
|
|
#define schedsoftcom() (ipending |= 1 << 4) /* XXX */
|
|
|
|
/*
|
|
* 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 int Bool_t; /* promoted boolean */
|
|
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) */
|
|
|
|
/*
|
|
* 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];
|
|
};
|
|
|
|
/*
|
|
* 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));
|
|
/*
|
|
* Also, most of the device switch functions are still declared old-style
|
|
* so they take a Dev_t arg and shorten it to a dev_t. It would be simpler
|
|
* and faster if dev_t's were always promoted (to ints or whatever) as
|
|
* early as possible.
|
|
*/
|
|
|
|
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));
|
|
#ifdef COM_MULTIPORT
|
|
static bool_t comintr1 __P((struct com_s *com));
|
|
#endif /* COM_MULTIPORT */
|
|
static int 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 compoll __P((void));
|
|
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];
|
|
|
|
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 = 1;
|
|
|
|
/*
|
|
* 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();
|
|
|
|
/*
|
|
* 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); /* DLAB = 1 */
|
|
outb(iobase + com_dlbl, COMBRD(9600) & 0xff); /* 9600bps */
|
|
outb(iobase + com_dlbh, ((u_int) COMBRD(9600) >> 8) & 0xff);
|
|
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(17000); /* wait for fifo drain on 9600 */
|
|
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_IMASK) != 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_IMASK) != IIR_NOPEND)
|
|
result = 0;
|
|
|
|
enable_intr();
|
|
return (result);
|
|
}
|
|
|
|
static int /* XXX - should be void */
|
|
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 = 200;
|
|
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];
|
|
#ifdef COM_BIDIR
|
|
/*
|
|
* if bidirectional ports possible, clear the bidir port info;
|
|
*/
|
|
com->bidir = FALSE;
|
|
com->active = FALSE;
|
|
com->active_in = com->active_out = FALSE;
|
|
#endif /* COM_BIDIR */
|
|
|
|
/* 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(iobase + com_iir) & 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:
|
|
com->hasfifo = TRUE;
|
|
printf(" <16550A>");
|
|
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(iobase + com_mcr, 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.
|
|
* Also make sure console is always "hardwired"
|
|
*/
|
|
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;
|
|
{
|
|
struct com_s *com;
|
|
int error = 0;
|
|
Port_t iobase;
|
|
int s;
|
|
struct tty *tp;
|
|
int unit = UNIT(dev);
|
|
#ifdef COM_BIDIR
|
|
bool_t callout = CALLOUT(dev);
|
|
#endif /* COM_BIDIR */
|
|
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 */
|
|
if (callout && !(com->bidir))
|
|
return (ENXIO);
|
|
#endif /* COM_BIDIR */
|
|
|
|
tp = com->tp;
|
|
s = spltty();
|
|
|
|
#ifdef COM_BIDIR
|
|
|
|
bidir_open_top:
|
|
/* 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;
|
|
}
|
|
} else 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 */
|
|
/* NOTE: cgd'sdriver used the ier register
|
|
* to enable/disable interrupts. This one
|
|
* uses both ier and IENABLE in the mcr.
|
|
*/
|
|
/* XXX - bring up RTS earlier? */
|
|
(void) 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 DTR off */
|
|
if (!com->active)
|
|
(void) 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. It's useful to have clocal on
|
|
* initially so that "stty changed-defaults </dev/sioX"
|
|
* doesn't hang waiting for carrier.
|
|
*
|
|
* XXX: CLOCAL is dangerous with incoming ports:
|
|
* it cause getty hangs after first login+logout.
|
|
* use "stty com_speed -clocal < /dev/comxx"
|
|
* before do anything with incoming port...
|
|
* Ache.
|
|
*/
|
|
tp->t_iflag = 0;
|
|
#ifdef COMCONSOLE
|
|
tp->t_oflag = TTYDEF_OFLAG;
|
|
#else
|
|
tp->t_oflag = 0;
|
|
#endif
|
|
tp->t_cflag = CREAD | CS8 | CLOCAL;
|
|
tp->t_lflag = 0;
|
|
tp->t_ispeed = tp->t_ospeed = comdefaultrate;
|
|
}
|
|
#ifdef COM_BIDIR
|
|
if (com->bidir) {
|
|
if (callout)
|
|
tp->t_cflag |= CLOCAL;
|
|
else
|
|
tp->t_cflag &= ~CLOCAL;
|
|
tp->t_cflag |= HUPCL;
|
|
}
|
|
#endif
|
|
(void) commctl(com, MCR_DTR | MCR_RTS, DMSET);
|
|
error = comparam(tp, &tp->t_termios);
|
|
if (error != 0)
|
|
goto out;
|
|
ttsetwater(tp);
|
|
iobase = com->iobase;
|
|
disable_intr();
|
|
if (com->hasfifo)
|
|
/* (re)enable and drain FIFO */
|
|
outb(iobase + com_fifo, FIFO_ENABLE | FIFO_TRIGGER_14
|
|
| FIFO_RCV_RST | FIFO_XMT_RST);
|
|
(void) inb(com->line_status_port);
|
|
(void) inb(com->data_port);
|
|
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:
|
|
splx(s);
|
|
if (error == 0)
|
|
error = (*linesw[tp->t_line].l_open)(dev, tp, 0);
|
|
|
|
#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;
|
|
|
|
com = com_addr(UNIT(dev));
|
|
tp = com->tp;
|
|
(*linesw[tp->t_line].l_close)(tp, flag);
|
|
comhardclose(com);
|
|
ttyclose(tp);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
comhardclose(com)
|
|
struct com_s *com;
|
|
{
|
|
Port_t iobase;
|
|
int s;
|
|
struct tty *tp;
|
|
|
|
s = spltty();
|
|
iobase = com->iobase;
|
|
outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
|
|
#ifdef KGDB
|
|
/* do not disable interrupts if debugging */
|
|
if (kgdb_dev != makedev(commajor, com - &com_structs[0]))
|
|
#endif
|
|
outb(iobase + com_ier, 0);
|
|
tp = com->tp;
|
|
if (tp->t_cflag & HUPCL || tp->t_state & TS_WOPEN
|
|
|| !(tp->t_state & TS_ISOPEN)) {
|
|
(void) commctl(com, MCR_RTS, DMSET);
|
|
if (com->dtr_wait != 0)
|
|
/* uninterruptible since we want to wait a fixed time */
|
|
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));
|
|
}
|
|
|
|
void
|
|
siointr(unit)
|
|
int unit;
|
|
{
|
|
struct com_s *com;
|
|
#ifndef COM_MULTIPORT
|
|
u_char line_status;
|
|
u_char modem_status;
|
|
u_char *ioptr;
|
|
u_char recv_data;
|
|
|
|
com = com_addr(unit);
|
|
#else /* COM_MULTIPORT */
|
|
int i;
|
|
bool_t donesomething;
|
|
|
|
/*
|
|
* 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, or it may cause a stray interrupt because another was on a
|
|
* short time before.
|
|
*
|
|
* XXX getting the status from comintr1() is not best and may be
|
|
* incorrect. It would be better to test the int_id's in a tight
|
|
* loop. If each is off when it is tested, then they all must
|
|
* have been off at the start.
|
|
*/
|
|
do {
|
|
donesomething = FALSE;
|
|
for(i=0;i<NSIO;i++) {
|
|
com=com_addr(i);
|
|
if(com != NULL) {
|
|
/* XXX call comintr1() instead of here from
|
|
* com_wakeup(). The interrupt edge problem
|
|
* only exists for real interrupts.
|
|
*/
|
|
donesomething |= comintr1(com);
|
|
}
|
|
}
|
|
} while (donesomething);
|
|
return;
|
|
}
|
|
|
|
static bool_t
|
|
comintr1(com)
|
|
struct com_s *com;
|
|
{
|
|
u_char line_status;
|
|
u_char modem_status;
|
|
u_char *ioptr;
|
|
u_char recv_data;
|
|
bool_t donesomething;
|
|
|
|
donesomething = FALSE;
|
|
#endif /* COM_MULTIPORT */
|
|
|
|
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? */
|
|
#ifdef COM_MULTIPORT
|
|
donesomething = TRUE;
|
|
#endif /* COM_MULTIPORT */
|
|
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;
|
|
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.
|
|
*/
|
|
#ifdef COM_MULTIPORT
|
|
donesomething = TRUE;
|
|
#endif /* COM_MULTIPORT */
|
|
com->last_modem_status = modem_status;
|
|
if (!(com->state & CS_CHECKMSR)) {
|
|
com_events += LOTS_OF_EVENTS;
|
|
com->state |= CS_CHECKMSR;
|
|
schedsoftcom();
|
|
}
|
|
|
|
/* 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)) {
|
|
#ifdef COM_MULTIPORT
|
|
donesomething = TRUE;
|
|
#endif /* COM_MULTIPORT */
|
|
ioptr = com->optr;
|
|
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);
|
|
schedsoftcom(); /* handle at high level ASAP */
|
|
}
|
|
}
|
|
|
|
/* finished? */
|
|
if ((inb(com->int_id_port) & IIR_IMASK) == IIR_NOPEND)
|
|
#ifdef COM_MULTIPORT
|
|
return (donesomething);
|
|
#else
|
|
return;
|
|
#endif /* COM_MULTIPORT */
|
|
}
|
|
}
|
|
|
|
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);
|
|
if (error >= 0)
|
|
return (error);
|
|
|
|
iobase = com->iobase;
|
|
s = spltty();
|
|
|
|
#ifdef COM_BIDIR
|
|
/* XXX: plug security hole while stucky bits not yet implemented */
|
|
|
|
if (com->bidir && com->active_in && p->p_ucred->cr_uid != 0) {
|
|
tp->t_cflag |= HUPCL;
|
|
tp->t_cflag &= ~CLOCAL;
|
|
}
|
|
#endif
|
|
|
|
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:
|
|
(void) commctl(com, MCR_DTR, DMBIS);
|
|
break;
|
|
case TIOCCDTR:
|
|
(void) commctl(com, MCR_DTR, DMBIC);
|
|
break;
|
|
case TIOCMSET:
|
|
(void) commctl(com, tiocm_xxx2mcr(*(int *)data), DMSET);
|
|
break;
|
|
case TIOCMBIS:
|
|
(void) commctl(com, tiocm_xxx2mcr(*(int *)data), DMBIS);
|
|
break;
|
|
case TIOCMBIC:
|
|
(void) 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_TERI is too volatile. */
|
|
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 */
|
|
if (p->p_ucred->cr_uid != 0)
|
|
return(EPERM);
|
|
|
|
/* if it's the console, can't do it */
|
|
if (UNIT(dev) == comconsole)
|
|
return(ENOTTY);
|
|
|
|
/* 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)
|
|
return(EBUSY); */
|
|
|
|
com->bidir = *(int *)data;
|
|
break;
|
|
case TIOCMGBIDIR:
|
|
*(int *)data = com->bidir;
|
|
break;
|
|
#endif /* COM_BIDIR */
|
|
case TIOCMSDTRWAIT:
|
|
/* must be root (XXX why?) */
|
|
if (p->p_ucred->cr_uid != 0)
|
|
return(EPERM);
|
|
|
|
/* if it's the console, can't do it (XXX why?) */
|
|
if (UNIT(dev) == comconsole)
|
|
return(ENOTTY);
|
|
|
|
com->dtr_wait = *(int *)data;
|
|
break;
|
|
case TIOCMGDTRWAIT:
|
|
*(int *)data = com->dtr_wait;
|
|
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;
|
|
}
|
|
|
|
static void
|
|
compoll()
|
|
{
|
|
static bool_t awake = FALSE;
|
|
struct com_s *com;
|
|
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 = 0;
|
|
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))
|
|
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->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;
|
|
u_int delta_error_counts[CE_NTYPES];
|
|
int errnum;
|
|
u_long total;
|
|
|
|
disable_intr();
|
|
bcopy(com->delta_error_counts, delta_error_counts,
|
|
sizeof delta_error_counts);
|
|
bzero(com->delta_error_counts,
|
|
sizeof delta_error_counts);
|
|
enable_intr();
|
|
for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
|
|
delta = delta_error_counts[errnum];
|
|
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 (divisor < 0 || t->c_ispeed != 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) {
|
|
(void) commctl(com, MCR_RTS, DMSET); /* hang up line */
|
|
splx(s);
|
|
return (0);
|
|
}
|
|
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 compoll() calls comstart() which set it again because
|
|
* TS_TTSTOP is set. Clearing 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;
|
|
|
|
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;
|
|
}
|
|
|
|
siointr(unit); /* recover from fiddling with CS_TTGO */
|
|
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();
|
|
siointr(unit);
|
|
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;
|
|
siointr(unit); /* 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();
|
|
}
|
|
|
|
static int
|
|
commctl(com, bits, how)
|
|
struct com_s *com;
|
|
int bits;
|
|
int how;
|
|
{
|
|
#ifdef COM_MULTIPORT
|
|
if (how != DMBIC && !com->multiport)
|
|
#else
|
|
if (how != DMBIC)
|
|
#endif
|
|
bits |= MCR_IENABLE;
|
|
disable_intr();
|
|
switch (how) {
|
|
case DMSET:
|
|
outb(com->modem_ctl_port, com->mcr_image = bits);
|
|
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();
|
|
return (bits);
|
|
}
|
|
|
|
static void
|
|
comwakeup(chan, ticks)
|
|
caddr_t chan;
|
|
int ticks;
|
|
{
|
|
struct com_s *com;
|
|
int unit;
|
|
|
|
timeout(comwakeup, (caddr_t) NULL, 1);
|
|
if (com_events != 0)
|
|
/* schedule compoll() to run when the cpl allows */
|
|
schedsoftcom();
|
|
|
|
/* recover from lost output interrupts */
|
|
for (unit = 0; unit < NSIO; ++unit) {
|
|
com = com_addr(unit);
|
|
if (com != NULL && com->state >= (CS_BUSY | CS_TTGO)) {
|
|
disable_intr();
|
|
siointr(unit);
|
|
enable_intr();
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
void
|
|
softsio1()
|
|
{
|
|
compoll();
|
|
}
|
|
|
|
/*
|
|
* Following are all routines needed for COM to act as console
|
|
* XXX - not tested in this version
|
|
* 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 = 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);
|
|
cp->cn_tp = &sio_tty[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_data, rate & 0xFF);
|
|
outb(iobase + com_ier, rate >> 8);
|
|
outb(iobase + com_cfcr, CFCR_8BITS);
|
|
|
|
/*
|
|
* 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);
|
|
outb(iobase + com_fifo,
|
|
FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST | FIFO_TRIGGER_14);
|
|
(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) {
|
|
(void) 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);
|
|
}
|
|
|
|
/*
|
|
* 10 Feb 93 Jordan K. Hubbard Added select code
|
|
* 27 May 93 Rodney W. Grimes Stole the select code from com.c.pl5
|
|
*
|
|
* XXX - the standard com.c never needed this, but we need it because
|
|
* ttselect() can't determine the tty struct because stuff is encoded in the
|
|
* high bit of the minor number.
|
|
*/
|
|
|
|
int
|
|
sioselect(dev, rw, p)
|
|
dev_t dev;
|
|
int rw;
|
|
struct proc *p;
|
|
{
|
|
struct tty *tp = &sio_tty[UNIT(dev)];
|
|
int nread;
|
|
int s = spltty();
|
|
struct proc *selp;
|
|
|
|
switch (rw) {
|
|
|
|
case FREAD:
|
|
nread = ttnread(tp);
|
|
if (nread > 0 ||
|
|
((tp->t_cflag&CLOCAL) == 0 && (tp->t_state&TS_CARR_ON) == 0))
|
|
goto win;
|
|
if (tp->t_rsel && (selp = pfind(tp->t_rsel)) && selp->p_wchan == (caddr_t)&selwait)
|
|
tp->t_state |= TS_RCOLL;
|
|
else
|
|
tp->t_rsel = p->p_pid;
|
|
break;
|
|
|
|
case FWRITE:
|
|
if (RB_LEN(&tp->t_out) <= tp->t_lowat)
|
|
goto win;
|
|
if (tp->t_wsel && (selp = pfind(tp->t_wsel)) && selp->p_wchan == (caddr_t)&selwait)
|
|
tp->t_state |= TS_WCOLL;
|
|
else
|
|
tp->t_wsel = p->p_pid;
|
|
break;
|
|
}
|
|
splx(s);
|
|
return (0);
|
|
win:
|
|
splx(s);
|
|
return (1);
|
|
}
|
|
|
|
#endif /* NSIO > 0 */
|