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7a6a5253ca
freebsd-skq/sys/dev/sio/sio.c
wpaul 7a6a5253ca Submitted by: Bill Paul (wpaul@ctr.columbia.edu) 
Obtained from:
sio.c and sioreg.c changed to allow autodetecting the RB_SERIAL flag
passed by the boot blocks so that the kernel can switch to 'serial
console' mode automagically. 'options COMCONSOLE' can still be specified
to force the kernel to always use the serial port as a console.
CONUNIT and CONADDR can also be specified in the kernel config file
if the user wants to shift the console to a different port.
1995-01-20 07:34:18 +00:00

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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 1.64 1995/01/06 15:03:41 bde 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/ioctl.h>
#define TTYDEFCHARS /* XXX TK2.0 */
#include <sys/tty.h>
#undef TTYDEFCHARS
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/conf.h>
#include <sys/dkstat.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
#include <sys/devconf.h>
#include <machine/clock.h>
#include <i386/isa/icu.h> /* XXX just to get at `imen' */
#include <i386/isa/isa.h>
#include <i386/isa/isa_device.h>
#include <i386/isa/sioreg.h>
#include <i386/isa/ic/ns16550.h>
/*
* XXX temporary kludges for 2.0 (XXX TK2.0).
*/
#define TS_RTS_IFLOW 0
#define TSA_CARR_ON(tp) ((void *)&(tp)->t_rawq)
#define TSA_OCOMPLETE(tp) ((void *)&(tp)->t_outq)
#define TSA_OLOWAT(tp) ((void *)&(tp)->t_outq)
void
termioschars(t)
struct termios *t;
{
bcopy(ttydefchars, t->c_cc, sizeof t->c_cc);
}
#define LOTS_OF_EVENTS 64 /* helps separate urgent events from input */
#define RB_I_HIGH_WATER (TTYHOG - 2 * RS_IBUFSIZE)
#define RS_IBUFSIZE 256
#define TTY_BI TTY_FE /* XXX */
#define TTY_OE TTY_PE /* XXX */
#define CALLOUT_MASK 0x80
#define CONTROL_MASK 0x60
#define CONTROL_INIT_STATE 0x20
#define CONTROL_LOCK_STATE 0x40
#define DEV_TO_UNIT(dev) (MINOR_TO_UNIT(minor(dev)))
#define MINOR_MAGIC_MASK (CALLOUT_MASK | CONTROL_MASK)
#define MINOR_TO_UNIT(mynor) ((mynor) & ~MINOR_MAGIC_MASK)
#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)
#define COM_NOTAST4(dev) ((dev)->id_flags & 0x04)
#endif /* COM_MULTIPORT */
#define COM_NOFIFO(dev) ((dev)->id_flags & 0x02)
#define COM_VERBOSE(dev) ((dev)->id_flags & 0x80)
#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:
* CS_BUSY = TS_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.
* XXX I think TIOCSETA doesn't clear TS_TTSTOP when it clears IXON.
* XXX CS_*FLOW should be CF_*FLOW in com->flags (control flags not state).
*/
#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_DTR_OFF 0x10 /* DTR held off */
#define CS_ODONE 4 /* output completed */
#define CS_RTS_IFLOW 8 /* use RTS input flow control */
static char const * const 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 */
bool_t active_out; /* nonzero if the callout device is open */
u_char cfcr_image; /* copy of value written to CFCR */
u_char ftl; /* current rx fifo trigger level */
u_char ftl_init; /* ftl_max for next open() */
u_char ftl_max; /* maximum ftl for curent open() */
bool_t hasfifo; /* nonzero for 16550 UARTs */
u_char mcr_image; /* copy of value written to MCR */
#ifdef COM_MULTIPORT
bool_t multiport; /* is this unit part of a multiport device? */
#endif /* COM_MULTIPORT */
bool_t no_irq; /* nonzero if irq is not attached */
bool_t poll; /* nonzero if polling is required */
int dtr_wait; /* time to hold DTR down on close (* 1/hz) */
u_int tx_fifo_size;
u_int wopeners; /* # processes waiting for DCD in open() */
/*
* 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 hotchar; /* ldisc-specific char to be handled ASAP */
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 */
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 */
/* Initial state. */
struct termios it_in; /* should be in struct tty */
struct termios it_out;
/* Lock state. */
struct termios lt_in; /* should be in struct tty */
struct termios lt_out;
bool_t do_timestamp;
struct timeval timestamp;
u_long bytes_in; /* statistics */
u_long bytes_out;
u_int delta_error_counts[CE_NTYPES];
u_long 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];
/*
* Output buffer. Someday we should avoid copying. Twice.
*/
u_char obuf[256];
};
/*
* The public functions in the com module ought to be declared in a com-driver
* system header.
*/
/* Interrupt handling entry points. */
void siointr __P((int unit));
void siopoll __P((void));
/* Device switch entry points. */
int sioopen __P((dev_t dev, int oflags, int devtype,
struct proc *p));
int sioclose __P((dev_t dev, int fflag, int devtype,
struct proc *p));
int sioread __P((dev_t dev, struct uio *uio, int ioflag));
int siowrite __P((dev_t dev, struct uio *uio, int ioflag));
int sioioctl __P((dev_t dev, int cmd, caddr_t data,
int fflag, struct proc *p));
void siostop __P((struct tty *tp, int rw));
#define sioreset noreset
int sioselect __P((dev_t dev, int rw, struct proc *p));
#define siommap nommap
#define siostrategy nostrategy
/* Console device entry points. */
int siocncheckc __P((dev_t dev));
int siocngetc __P((dev_t dev));
struct consdev;
void siocninit __P((struct consdev *cp));
void siocnprobe __P((struct consdev *cp));
void siocnputc __P((dev_t dev, int c));
static int sioattach __P((struct isa_device *dev));
static timeout_t siodtrwakeup;
static void comflush __P((struct com_s *com));
static void comhardclose __P((struct com_s *com));
static void siointr1 __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 sioregisterdev __P((struct isa_device *id));
static void comstart __P((struct tty *tp));
static timeout_t comwakeup;
static int tiocm_xxx2mcr __P((int tiocm_xxx));
#ifdef DSI_SOFT_MODEM
static int LoadSoftModem __P((int unit,int base_io, u_long size, u_char *ptr));
#endif /* DSI_SOFT_MODEM */
/* 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 timeval intr_timestamp;
struct isa_driver siodriver = {
sioprobe, sioattach, "sio"
};
#ifdef COMCONSOLE
#define COMCONSOLE 1
#else
#define COMCONSOLE 0
#endif
static int comconsole = CONUNIT;
static speed_t comdefaultrate = TTYDEF_SPEED;
static u_int com_events; /* input chars + weighted output completions */
static int commajor;
#if 0 /* XXX TK2.0 */
struct tty *sio_tty[NSIO];
#else
struct tty sio_tty[NSIO];
#endif
extern struct tty *constty; /* 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;
bool_t failures[10];
int fn;
struct isa_device *idev;
Port_t iobase;
u_char mcr_image;
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.
* XXX the gate enable is elsewhere for some multiports.
*/
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;
}
/*
* If the device is on a multiport card and has an AST/4
* compatible interrupt control register, initialize this
* register and prepare to leave MCR_IENABLE clear in the mcr.
* Otherwise, prepare to set MCR_IENABLE in the mcr.
* Point idev to the device struct giving the correct id_irq.
* This is the struct for the master device if there is one.
*/
idev = dev;
mcr_image = MCR_IENABLE;
#ifdef COM_MULTIPORT
if (COM_ISMULTIPORT(dev)) {
idev = find_isadev(isa_devtab_tty, &siodriver,
COM_MPMASTER(dev));
if (idev == NULL) {
printf("sio%d: master device %d not configured\n",
dev->id_unit, COM_MPMASTER(dev));
return (0);
}
if (!COM_NOTAST4(dev)) {
outb(idev->id_iobase + com_scr,
idev->id_irq ? 0x80 : 0);
mcr_image = 0;
}
}
#endif /* COM_MULTIPORT */
if (idev->id_irq == 0)
mcr_image = 0;
bzero(failures, sizeof failures);
iobase = dev->id_iobase;
/*
* 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();
/*
* XXX DELAY() reenables CPU interrupts. This is a problem for
* shared interrupts after the first device using one has been
* successfully probed - config_isadev() has enabled the interrupt
* in the ICU.
*/
outb(IO_ICU1 + 1, 0xff);
/*
* Initialize the speed and the word size and wait long enough to
* drain the maximum of 16 bytes of junk in device output queues.
* The speed is undefined after a master reset and must be set
* before relying on anything related to output. There may be
* junk after a (very fast) soft reboot and (apparently) after
* master reset.
* XXX what about the UART bug avoided by waiting in comparam()?
* We don't want to to wait long enough to drain at 2 bps.
*/
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);
DELAY((16 + 1) * 9600 / 10);
/*
* Enable the interrupt gate and disable device interupts. This
* should leave the device driving the interrupt line low and
* guarantee an edge trigger if an interrupt can be generated.
*/
outb(iobase + com_mcr, mcr_image);
outb(iobase + com_ier, 0);
/*
* Attempt to set loopback mode so that we can send a null byte
* without annoying any external device.
*/
outb(iobase + com_mcr, mcr_image | MCR_LOOPBACK);
/*
* Attempt to generate an output interrupt. On 8250's, setting
* IER_ETXRDY generates an interrupt independent of the current
* setting and independent of whether the THR is empty. On 16450's,
* setting IER_ETXRDY generates an interrupt independent of the
* current setting. On 16550A's, setting IER_ETXRDY only
* generates an interrupt when IER_ETXRDY is not already set.
*/
outb(iobase + com_ier, IER_ETXRDY);
/*
* On some 16x50 incompatibles, setting IER_ETXRDY doesn't generate
* an interrupt. They'd better generate one for actually doing
* output. Loopback may be broken on the same incompatibles but
* it's unlikely to do more than allow the null byte out.
*/
outb(iobase + com_data, 0);
DELAY((1 + 2) * 9600 / 10);
/*
* Turn off loopback mode so that the interrupt gate works again
* (MCR_IENABLE was hidden). This should leave the device driving
* an interrupt line high. It doesn't matter if the interrupt
* line oscillates while we are not looking at it, since interrupts
* are disabled.
*/
outb(iobase + com_mcr, mcr_image);
/*
* Check that
* 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.
*/
failures[0] = inb(iobase + com_cfcr) - CFCR_8BITS;
failures[1] = inb(iobase + com_ier) - IER_ETXRDY;
failures[2] = inb(iobase + com_mcr) - mcr_image;
if (idev->id_irq != 0)
failures[3] = isa_irq_pending(idev) ? 0 : 1;
failures[4] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_TXRDY;
if (idev->id_irq != 0)
failures[5] = isa_irq_pending(idev) ? 1 : 0;
failures[6] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_NOPEND;
/*
* Turn off all device interrupts and check that they go off properly.
* Leave MCR_IENABLE alone. For ports without a master port, 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_cfcr, CFCR_8BITS); /* dummy to avoid bus echo */
failures[7] = inb(iobase + com_ier);
if (idev->id_irq != 0)
failures[8] = isa_irq_pending(idev) ? 1 : 0;
failures[9] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_NOPEND;
outb(IO_ICU1 + 1, imen); /* XXX */
enable_intr();
result = IO_COMSIZE;
for (fn = 0; fn < sizeof failures; ++fn)
if (failures[fn]) {
outb(iobase + com_mcr, 0);
result = 0;
if (COM_VERBOSE(dev))
printf("sio%d: probe test %d failed\n",
dev->id_unit, fn);
}
return (result);
}
static struct kern_devconf kdc_sio[NSIO] = { {
0, 0, 0, /* filled in by dev_attach */
"sio", 0, { MDDT_ISA, 0, "tty" },
isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
&kdc_isa0, /* parent */
0, /* parentdata */
DC_UNCONFIGURED,
"RS-232 serial port"
} };
static void
sioregisterdev(id)
struct isa_device *id;
{
int unit;
unit = id->id_unit;
if (unit != 0)
kdc_sio[unit] = kdc_sio[0];
kdc_sio[unit].kdc_unit = unit;
kdc_sio[unit].kdc_isa = id;
kdc_sio[unit].kdc_state = DC_IDLE;
dev_attach(&kdc_sio[unit]);
}
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;
isdp->id_ri_flags |= RI_FAST;
iobase = isdp->id_iobase;
unit = isdp->id_unit;
com = malloc(sizeof *com, M_TTYS, M_NOWAIT);
if (com == NULL)
return (0);
/*
* 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, or 0 if the port has AST/4 compatible
* interrupt control register or the config specifies no irq.
* Keeping MCR_DTR and MCR_RTS off might stop the external
* device from sending before we are ready.
*/
bzero(com, sizeof *com);
com->cfcr_image = CFCR_8BITS;
com->dtr_wait = 3 * hz;
com->no_irq = isdp->id_irq == 0;
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->mcr_image = inb(com->modem_ctl_port);
com->line_status_port = iobase + com_lsr;
com->modem_status_port = iobase + com_msr;
/*
* We don't use all the flags from <sys/ttydefaults.h> since they
* 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.
*/
com->it_in.c_iflag = 0;
com->it_in.c_oflag = 0;
com->it_in.c_cflag = TTYDEF_CFLAG;
com->it_in.c_lflag = 0;
if (unit == comconsole && ((boothowto & RB_SERIAL) || COMCONSOLE)) {
com->it_in.c_iflag = TTYDEF_IFLAG;
com->it_in.c_oflag = TTYDEF_OFLAG;
com->it_in.c_cflag = TTYDEF_CFLAG | CLOCAL;
com->it_in.c_lflag = TTYDEF_LFLAG;
com->lt_out.c_cflag = com->lt_in.c_cflag = CLOCAL;
}
termioschars(&com->it_in);
com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
com->it_out = com->it_in;
/* attempt to determine UART type */
printf("sio%d: type", unit);
#ifdef DSI_SOFT_MODEM
if((inb(iobase+7) ^ inb(iobase+7)) & 0x80) {
printf(" Digicom Systems, Inc. SoftModem");
goto determined_type;
}
#endif /* DSI_SOFT_MODEM */
#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 disabled");
else {
com->hasfifo = TRUE;
com->ftl_init = FIFO_TRIGGER_14;
com->tx_fifo_size = 16;
}
break;
}
outb(iobase + com_fifo, 0);
determined_type: ;
#ifdef COM_MULTIPORT
if (COM_ISMULTIPORT(isdp)) {
com->multiport = TRUE;
printf(" (multiport");
if (unit == COM_MPMASTER(isdp))
printf(" master");
printf(")");
com->no_irq = find_isadev(isa_devtab_tty, &siodriver,
COM_MPMASTER(isdp))->id_irq == 0;
}
#endif /* COM_MULTIPORT */
printf("\n");
sioregisterdev(isdp);
#ifdef KGDB
if (kgdb_dev == makedev(commajor, unit)) {
if (unit == comconsole && ((boothowto & RB_SERIAL)
|| COMCONSOLE))
kgdb_dev = -1; /* can't debug over console port */
else {
int divisor;
/*
* XXX now unfinished and broken. Need to do
* something more like a full open(). There's no
* suitable interrupt handler so don't enable device
* interrupts. Watch out for null tp's.
*/
outb(iobase + com_cfcr, CFCR_DLAB);
divisor = ttspeedtab(kgdb_rate, comspeedtab);
outb(iobase + com_dlbl, divisor & 0xFF);
outb(iobase + com_dlbh, (u_int) divisor >> 8);
outb(iobase + com_cfcr, CFCR_8BITS);
outb(com->modem_status_port,
com->mcr_image |= MCR_DTR | MCR_RTS);
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
s = spltty();
com_addr(unit) = com;
splx(s);
if (!comwakeup_started) {
comwakeup((void *)NULL);
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;
Port_t iobase;
int mynor;
int s;
struct tty *tp;
int unit;
mynor = minor(dev);
unit = MINOR_TO_UNIT(mynor);
if ((u_int) unit >= NSIO || (com = com_addr(unit)) == NULL)
return (ENXIO);
if (mynor & CONTROL_MASK)
return (0);
#if 0 /* XXX TK2.0 */
tp = com->tp = sio_tty[unit] = ttymalloc(sio_tty[unit]);
#else
tp = com->tp = &sio_tty[unit];
#endif
s = spltty();
/*
* We jump to this label after all non-interrupted sleeps to pick
* up any changes of the device state.
*/
open_top:
while (com->state & CS_DTR_OFF) {
error = tsleep(&com->dtr_wait, TTIPRI | PCATCH, "siodtr", 0);
if (error != 0)
goto out;
}
kdc_sio[unit].kdc_state = DC_BUSY;
if (tp->t_state & TS_ISOPEN) {
/*
* The device is open, so everything has been initialized.
* Handle conflicts.
*/
if (mynor & CALLOUT_MASK) {
if (!com->active_out) {
error = EBUSY;
goto out;
}
} else {
if (com->active_out) {
if (flag & O_NONBLOCK) {
error = EBUSY;
goto out;
}
error = tsleep(&com->active_out,
TTIPRI | PCATCH, "siobi", 0);
if (error != 0)
goto out;
goto open_top;
}
}
if (tp->t_state & TS_XCLUDE && p->p_ucred->cr_uid != 0) {
error = EBUSY;
goto out;
}
} else {
/*
* The device isn't open, so there are no conflicts.
* Initialize it. Initialization is done twice in many
* cases: to preempt sleeping callin opens if we are
* callout, and to complete a callin open after DCD rises.
*/
tp->t_oproc = comstart;
tp->t_param = comparam;
tp->t_dev = dev;
tp->t_termios = mynor & CALLOUT_MASK
? com->it_out : com->it_in;
commctl(com, MCR_DTR | MCR_RTS, DMSET);
com->ftl_max = com->ftl_init;
com->poll = com->no_irq;
++com->wopeners;
error = comparam(tp, &tp->t_termios);
--com->wopeners;
if (error != 0)
goto out;
/*
* XXX we should goto open_top if comparam() slept.
*/
ttsetwater(tp);
iobase = com->iobase;
if (com->hasfifo) {
/*
* (Re)enable and drain fifos.
*
* Certain SMC chips cause problems if the fifos
* are enabled while input is ready. Turn off the
* fifo if necessary to clear the input. We test
* the input ready bit after enabling the fifos
* since we've already enabled them in comparam()
* and to handle races between enabling and fresh
* input.
*/
while (TRUE) {
outb(iobase + com_fifo,
FIFO_RCV_RST | FIFO_XMT_RST
| FIFO_ENABLE | com->ftl);
DELAY(100);
if (!(inb(com->line_status_port) & LSR_RXRDY))
break;
outb(iobase + com_fifo, 0);
DELAY(100);
(void) inb(com->data_port);
}
}
disable_intr();
(void) inb(com->line_status_port);
(void) inb(com->data_port);
com->prev_modem_status =
com->last_modem_status = inb(com->modem_status_port);
outb(iobase + com_ier, IER_ERXRDY | IER_ETXRDY | IER_ERLS
| IER_EMSC);
enable_intr();
/*
* Handle initial DCD. Callout devices get a fake initial
* DCD (trapdoor DCD). If we are callout, then any sleeping
* callin opens get woken up and resume sleeping on "siobi"
* instead of "siodcd".
*/
if (com->prev_modem_status & MSR_DCD || mynor & CALLOUT_MASK)
(*linesw[tp->t_line].l_modem)(tp, 1);
}
/*
* Wait for DCD if necessary.
*/
if (!(tp->t_state & TS_CARR_ON) && !(mynor & CALLOUT_MASK)
&& !(tp->t_cflag & CLOCAL) && !(flag & O_NONBLOCK)) {
++com->wopeners;
error = tsleep(TSA_CARR_ON(tp), TTIPRI | PCATCH, "siodcd", 0);
--com->wopeners;
if (error != 0)
goto out;
goto open_top;
}
error = (*linesw[tp->t_line].l_open)(dev, tp);
if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
com->active_out = TRUE;
out:
splx(s);
if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
comhardclose(com);
return (error);
}
/*ARGSUSED*/
int
sioclose(dev, flag, mode, p)
dev_t dev;
int flag;
int mode;
struct proc *p;
{
struct com_s *com;
int mynor;
int s;
struct tty *tp;
mynor = minor(dev);
if (mynor & CONTROL_MASK)
return (0);
com = com_addr(MINOR_TO_UNIT(mynor));
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;
unit = DEV_TO_UNIT(com->tp->t_dev);
iobase = com->iobase;
s = spltty();
com->poll = FALSE;
com->do_timestamp = 0;
outb(iobase + com_cfcr, com->cfcr_image &= ~CFCR_SBREAK);
#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
/*
* XXX we will miss any carrier drop between here and the
* next open. Perhaps we should watch DCD even when the
* port is closed; it is not sufficient to check it at
* the next open because it might go up and down while
* we're not watching.
*/
|| !com->active_out
&& !(com->prev_modem_status & MSR_DCD)
&& !(com->it_in.c_cflag & CLOCAL)
|| !(tp->t_state & TS_ISOPEN)) {
commctl(com, MCR_RTS, DMSET);
if (com->dtr_wait != 0) {
timeout(siodtrwakeup, com, com->dtr_wait);
com->state |= CS_DTR_OFF;
}
}
}
com->active_out = FALSE;
wakeup(&com->active_out);
wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
if (!(com->state & CS_DTR_OFF))
kdc_sio[unit].kdc_state = DC_IDLE;
splx(s);
}
int
sioread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int mynor;
struct tty *tp;
mynor = minor(dev);
if (mynor & CONTROL_MASK)
return (ENODEV);
tp = com_addr(MINOR_TO_UNIT(mynor))->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 mynor;
struct tty *tp;
int unit;
mynor = minor(dev);
if (mynor & CONTROL_MASK)
return (ENODEV);
unit = MINOR_TO_UNIT(mynor);
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 && ((boothowto & RB_SERIAL)
|| COMCONSOLE))
constty = NULL;
return ((*linesw[tp->t_line].l_write)(tp, uio, flag));
}
static void
siodtrwakeup(chan)
void *chan;
{
struct com_s *com;
com = (struct com_s *)chan;
com->state &= ~CS_DTR_OFF;
kdc_sio[DEV_TO_UNIT(com->tp->t_dev)].kdc_state = DC_IDLE;
wakeup(&com->dtr_wait);
}
/* Interrupt routine for timekeeping purposes */
void
siointrts(unit)
int unit;
{
/*
* XXX microtime() reenables CPU interrupts. We can't afford to
* be interrupted and don't want to slow down microtime(), so lock
* out interrupts in another way.
*/
outb(IO_ICU1 + 1, 0xff);
microtime(&intr_timestamp);
disable_intr();
outb(IO_ICU1 + 1, imen);
siointr(unit);
}
void
siointr(unit)
int unit;
{
#ifndef COM_MULTIPORT
siointr1(com_addr(unit));
#else /* COM_MULTIPORT */
struct com_s *com;
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_IMASK)
!= IIR_NOPEND) {
siointr1(com);
possibly_more_intrs = TRUE;
}
}
} while (possibly_more_intrs);
#endif /* COM_MULTIPORT */
}
static void
siointr1(com)
struct com_s *com;
{
u_char line_status;
u_char modem_status;
u_char *ioptr;
u_char recv_data;
if (com->do_timestamp)
/* XXX a little bloat here... */
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;
if (com->hotchar != 0 && recv_data == com->hotchar)
setsofttty();
#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_IMASK) == 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 mynor;
int s;
int tiocm_xxx;
struct tty *tp;
mynor = minor(dev);
com = com_addr(MINOR_TO_UNIT(mynor));
iobase = com->iobase;
if (mynor & CONTROL_MASK) {
struct termios *ct;
switch (mynor & CONTROL_MASK) {
case CONTROL_INIT_STATE:
ct = mynor & CALLOUT_MASK ? &com->it_out : &com->it_in;
break;
case CONTROL_LOCK_STATE:
ct = mynor & CALLOUT_MASK ? &com->lt_out : &com->lt_in;
break;
default:
return (ENODEV); /* /dev/nodev */
}
switch (cmd) {
case TIOCSETA:
error = suser(p->p_ucred, &p->p_acflag);
if (error != 0)
return (error);
*ct = *(struct termios *)data;
return (0);
case TIOCGETA:
*(struct termios *)data = *ct;
return (0);
case TIOCGETD:
*(int *)data = TTYDISC;
return (0);
case TIOCGWINSZ:
bzero(data, sizeof(struct winsize));
return (0);
#ifdef DSI_SOFT_MODEM
/*
* Download micro-code to Digicom modem.
*/
case TIOCDSIMICROCODE:
{
u_long l;
u_char *p,*pi;
pi = (u_char*)(*(caddr_t*)data);
error = copyin(pi,&l,sizeof l);
if(error)
{return error;};
pi += sizeof l;
p = malloc(l,M_TEMP,M_NOWAIT);
if(!p)
{return ENOBUFS;}
error = copyin(pi,p,l);
if(error)
{free(p,M_TEMP); return error;};
if(error = LoadSoftModem(
MINOR_TO_UNIT(mynor),iobase,l,p))
{free(p,M_TEMP); return error;}
free(p,M_TEMP);
return(0);
}
#endif /* DSI_SOFT_MODEM */
default:
return (ENOTTY);
}
}
tp = com->tp;
if (cmd == TIOCSETA || cmd == TIOCSETAW || cmd == TIOCSETAF) {
int cc;
struct termios *dt = (struct termios *)data;
struct termios *lt = mynor & CALLOUT_MASK
? &com->lt_out : &com->lt_in;
dt->c_iflag = (tp->t_iflag & lt->c_iflag)
| (dt->c_iflag & ~lt->c_iflag);
dt->c_oflag = (tp->t_oflag & lt->c_oflag)
| (dt->c_oflag & ~lt->c_oflag);
dt->c_cflag = (tp->t_cflag & lt->c_cflag)
| (dt->c_cflag & ~lt->c_cflag);
dt->c_lflag = (tp->t_lflag & lt->c_lflag)
| (dt->c_lflag & ~lt->c_lflag);
for (cc = 0; cc < NCCS; ++cc)
if (lt->c_cc[cc] != 0)
dt->c_cc[cc] = tp->t_cc[cc];
if (lt->c_ispeed != 0)
dt->c_ispeed = tp->t_ispeed;
if (lt->c_ospeed != 0)
dt->c_ospeed = tp->t_ospeed;
}
error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
if (error >= 0)
return (error);
error = ttioctl(tp, cmd, data, flag);
if (error >= 0)
return (error);
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;
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 (error);
}
com->dtr_wait = *(int *)data * hz / 100;
break;
case TIOCMGDTRWAIT:
*(int *)data = com->dtr_wait * 100 / hz;
break;
case TIOCTIMESTAMP:
com->do_timestamp = TRUE;
*(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;
{
disable_intr();
if (com->state & CS_ODONE)
com_events -= LOTS_OF_EVENTS;
com->state &= ~(CS_ODONE | CS_BUSY);
enable_intr();
com->tp->t_state &= ~TS_BUSY;
}
void
siopoll()
{
int unit;
if (com_events == 0)
return;
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;
if (tp == NULL) {
/*
* XXX forget any events related to closed devices
* (actually never opened devices) so that we don't
* loop.
*/
disable_intr();
incc = com->iptr - com->ibuf;
com->iptr = com->ibuf;
if (com->state & CS_CHECKMSR) {
incc += LOTS_OF_EVENTS;
com->state &= ~CS_CHECKMSR;
}
com_events -= incc;
enable_intr();
if (incc != 0)
log(LOG_DEBUG,
"sio%d: %d events for device with no tp\n",
unit, incc);
continue;
}
/* 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 {
/*
* Prepare to reduce input latency for packet
* discplines with a end of packet character.
* XXX should be elsewhere.
*/
if (tp->t_line == SLIPDISC)
com->hotchar = 0xc0;
else if (tp->t_line == PPPDISC)
com->hotchar = 0x7e;
else
com->hotchar = 0;
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.
*/
/*
* XXX this used not to look at CS_RTS_IFLOW. The
* change is to allow full control of MCR_RTS via
* ioctls after turning CS_RTS_IFLOW off. Check
* for races. We shouldn't allow the ioctls while
* CS_RTS_IFLOW is on.
*/
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)
(*linesw[tp->t_line].l_modem)
(tp, com->prev_modem_status & MSR_DCD);
}
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
&& tp->t_rawq.c_cc + 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]
+= b_to_q((char *)buf, incc, &tp->t_rawq);
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;
}
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 || divisor > 0 && t->c_ispeed != t->c_ospeed)
return (EINVAL);
/* parameters are OK, convert them to the com struct and the device */
unit = DEV_TO_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;
if (com->hasfifo) {
/*
* Use a fifo trigger level low enough so that the input
* latency from the fifo is less than about 16 msec and
* the total latency is less than about 30 msec. These
* latencies are reasonable for humans. Serial comms
* protocols shouldn't expect anything better since modem
* latencies are larger.
*/
com->ftl = t->c_ospeed <= 4800
? FIFO_TRIGGER_1 : FIFO_TRIGGER_14;
if (com->ftl > com->ftl_max)
com->ftl = com->ftl_max;
outb(iobase + com_fifo, FIFO_ENABLE | com->ftl);
}
/*
* 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 siointr1() 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, TSA_OCOMPLETE(tp), TTIPRI | PCATCH,
"siotx", hz / 100);
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 10+ 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 siointr1()
* unconditionally, but that defeated the careful discarding of
* stale input in sioopen().
*/
if (com->state >= (CS_BUSY | CS_TTGO))
siointr1(com);
enable_intr();
splx(s);
return (0);
}
static void
comstart(tp)
struct tty *tp;
{
struct com_s *com;
int s;
int unit;
unit = DEV_TO_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 {
/*
* XXX don't raise MCR_RTS if CTS_RTS_IFLOW is off. Set it
* appropriately in comparam() if RTS-flow is being changed.
* Check for races.
*/
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 0 /* XXX TK2.0 */
if (tp->t_state & (TS_SO_OCOMPLETE | TS_SO_OLOWAT) || tp->t_wsel)
ttwwakeup(tp);
#else
if (tp->t_outq.c_cc <= tp->t_lowat) {
if (tp->t_state & TS_ASLEEP) {
tp->t_state &= ~TS_ASLEEP;
wakeup(TSA_OLOWAT(tp));
}
selwakeup(&tp->t_wsel);
}
#endif
if (tp->t_state & TS_BUSY) {
disable_intr();
siointr1(com);
enable_intr();
} else if (tp->t_outq.c_cc != 0) {
u_int ocount;
tp->t_state |= TS_BUSY;
ocount = q_to_b(&tp->t_outq, com->obuf, sizeof com->obuf);
disable_intr();
com->obufend = (com->optr = com->obuf) + ocount;
com->state |= CS_BUSY;
siointr1(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(DEV_TO_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;
{
if (minor(dev) & CONTROL_MASK)
return (ENODEV);
return (ttselect(dev & ~MINOR_MAGIC_MASK, rw, p));
}
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)
void *chan;
{
struct com_s *com;
static int log_countdown = 1;
int unit;
timeout(comwakeup, (caddr_t)NULL, hz > 200 ? hz / 200 : 1);
if (com_events != 0) {
int s;
s = splsofttty();
siopoll();
splx(s);
}
/*
* Recover from lost output interrupts.
* Poll any lines that don't use interrupts.
*/
for (unit = 0; unit < NSIO; ++unit) {
com = com_addr(unit);
if (com != NULL
&& (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
disable_intr();
siointr1(com);
enable_intr();
}
}
/*
* Check for and log errors, but not too often.
*/
if (--log_countdown > 0)
return;
log_countdown = hz > 200 ? 200 : hz;
for (unit = 0; unit < NSIO; ++unit) {
int errnum;
com = com_addr(unit);
if (com == NULL)
continue;
for (errnum = 0; errnum < CE_NTYPES; ++errnum) {
u_int delta;
u_long total;
disable_intr();
delta = com->delta_error_counts[errnum];
com->delta_error_counts[errnum] = 0;
enable_intr();
if (delta == 0)
continue;
total = com->error_counts[errnum] += delta;
log(LOG_ERR, "sio%d: %u more %s%s (total %lu)\n",
unit, delta, error_desc[errnum],
delta == 1 ? "" : "s", total);
#if 0
/*
* XXX if we resurrect this then we should move
* the dropping of the ftl to somewhere with less
* latency.
*/
if (errnum == CE_OVERRUN && com->hasfifo
&& com->ftl > FIFO_TRIGGER_1) {
static u_char ftl_in_bytes[] =
{ 1, 4, 8, 14, };
com->ftl_init = FIFO_TRIGGER_8;
#define FIFO_TRIGGER_DELTA FIFO_TRIGGER_4
com->ftl_max =
com->ftl -= FIFO_TRIGGER_DELTA;
outb(com->iobase + com_fifo,
FIFO_ENABLE | com->ftl);
log(LOG_DEBUG,
"sio%d: reduced fifo trigger level to %d\n",
unit,
ftl_in_bytes[com->ftl
/ FIFO_TRIGGER_DELTA]);
}
#endif
}
}
}
/*
* Following are all routines needed for SIO to act as console
*/
#include "i386/i386/cons.h"
struct siocnstate {
u_char dlbl;
u_char dlbh;
u_char ier;
u_char cfcr;
u_char mcr;
};
static Port_t siocniobase;
static void siocnclose __P((struct siocnstate *sp));
static void siocnopen __P((struct siocnstate *sp));
static void siocntxwait __P((void));
static void
siocntxwait()
{
int timo;
/*
* Wait for any pending transmission to finish. Required to avoid
* the UART lockup bug when the speed is changed, and for normal
* transmits.
*/
timo = 100000;
while ((inb(siocniobase + com_lsr) & (LSR_TSRE | LSR_TXRDY))
!= (LSR_TSRE | LSR_TXRDY) && --timo != 0)
;
}
static void
siocnopen(sp)
struct siocnstate *sp;
{
int divisor;
Port_t iobase;
/*
* Save all the device control registers except the fifo register
* and set our default ones (cs8 -parenb speed=comdefaultrate).
* We can't save the fifo register since it is read-only.
*/
iobase = siocniobase;
sp->ier = inb(iobase + com_ier);
outb(iobase + com_ier, 0); /* spltty() doesn't stop siointr() */
siocntxwait();
sp->cfcr = inb(iobase + com_cfcr);
outb(iobase + com_cfcr, CFCR_DLAB);
sp->dlbl = inb(iobase + com_dlbl);
sp->dlbh = inb(iobase + com_dlbh);
divisor = ttspeedtab(comdefaultrate, comspeedtab);
outb(iobase + com_dlbl, divisor & 0xFF);
outb(iobase + com_dlbh, (u_int) divisor >> 8);
outb(iobase + com_cfcr, CFCR_8BITS);
sp->mcr = inb(iobase + com_mcr);
/*
* We don't want interrupts, but must be careful not to "disable"
* them by clearing the MCR_IENABLE bit, since that might cause
* an interrupt by floating the IRQ line.
*/
outb(iobase + com_mcr, (sp->mcr & MCR_IENABLE) | MCR_DTR | MCR_RTS);
}
static void
siocnclose(sp)
struct siocnstate *sp;
{
Port_t iobase;
/*
* Restore the device control registers.
*/
siocntxwait();
iobase = siocniobase;
outb(iobase + com_cfcr, CFCR_DLAB);
outb(iobase + com_dlbl, sp->dlbl);
outb(iobase + com_dlbh, sp->dlbh);
outb(iobase + com_cfcr, sp->cfcr);
/*
* XXX damp oscillations of MCR_DTR and MCR_RTS by not restoring them.
*/
outb(iobase + com_mcr, sp->mcr | MCR_DTR | MCR_RTS);
outb(iobase + com_ier, sp->ier);
}
void
siocnprobe(cp)
struct consdev *cp;
{
int unit;
/* locate the major number */
/* XXX - should be elsewhere since KGDB uses it */
for (commajor = 0; commajor < nchrdev; commajor++)
if (cdevsw[commajor].d_open == sioopen)
break;
/* XXX: ick */
unit = DEV_TO_UNIT(CONUNIT);
siocniobase = CONADDR;
/* make sure hardware exists? XXX */
/* initialize required fields */
cp->cn_dev = makedev(commajor, unit);
if (boothowto & RB_SERIAL || COMCONSOLE)
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
else
cp->cn_pri = CN_NORMAL;
}
void
siocninit(cp)
struct consdev *cp;
{
/*
* XXX can delete more comconsole stuff now that i/o routines are
* fairly reentrant.
*/
comconsole = DEV_TO_UNIT(cp->cn_dev);
}
int
siocncheckc(dev)
dev_t dev;
{
int c;
Port_t iobase;
int s;
struct siocnstate sp;
iobase = siocniobase;
s = spltty();
siocnopen(&sp);
if (inb(iobase + com_lsr) & LSR_RXRDY)
c = inb(iobase + com_data);
else
c = 0;
siocnclose(&sp);
splx(s);
return (c);
}
int
siocngetc(dev)
dev_t dev;
{
int c;
Port_t iobase;
int s;
struct siocnstate sp;
iobase = siocniobase;
s = spltty();
siocnopen(&sp);
while (!(inb(iobase + com_lsr) & LSR_RXRDY))
;
c = inb(iobase + com_data);
siocnclose(&sp);
splx(s);
return (c);
}
void
siocnputc(dev, c)
dev_t dev;
int c;
{
int s;
struct siocnstate sp;
s = spltty();
siocnopen(&sp);
siocntxwait();
outb(siocniobase + com_data, c);
siocnclose(&sp);
splx(s);
}
#ifdef DSI_SOFT_MODEM
/*
* The magic code to download microcode to a "Connection 14.4+Fax"
* modem from Digicom Systems Inc. Very magic.
*/
#define DSI_ERROR(str) { ptr = str; goto error; }
static int
LoadSoftModem(int unit, int base_io, u_long size, u_char *ptr)
{
int int_c,int_k;
int data_0188, data_0187;
/*
* First see if it is a DSI SoftModem
*/
if(!((inb(base_io+7) ^ inb(base_io+7) & 0x80)))
return ENODEV;
data_0188 = inb(base_io+4);
data_0187 = inb(base_io+3);
outb(base_io+3,0x80);
outb(base_io+4,0x0C);
outb(base_io+0,0x31);
outb(base_io+1,0x8C);
outb(base_io+7,0x10);
outb(base_io+7,0x19);
if(0x18 != (inb(base_io+7) & 0x1A))
DSI_ERROR("dsp bus not granted");
if(0x01 != (inb(base_io+7) & 0x01)) {
outb(base_io+7,0x18);
outb(base_io+7,0x19);
if(0x01 != (inb(base_io+7) & 0x01))
DSI_ERROR("program mem not granted");
}
int_c = 0;
while(1) {
if(int_c >= 7 || size <= 0x1800)
break;
for(int_k = 0 ; int_k < 0x800; int_k++) {
outb(base_io+0,*ptr++);
outb(base_io+1,*ptr++);
outb(base_io+2,*ptr++);
}
size -= 0x1800;
int_c++;
}
if(size > 0x1800) {
outb(base_io+7,0x18);
outb(base_io+7,0x19);
if(0x00 != (inb(base_io+7) & 0x01))
DSI_ERROR("program data not granted");
for(int_k = 0 ; int_k < 0x800; int_k++) {
outb(base_io+1,*ptr++);
outb(base_io+2,0);
outb(base_io+1,*ptr++);
outb(base_io+2,*ptr++);
}
size -= 0x1800;
while(size > 0x1800) {
for(int_k = 0 ; int_k < 0xC00; int_k++) {
outb(base_io+1,*ptr++);
outb(base_io+2,*ptr++);
}
size -= 0x1800;
}
if(size < 0x1800) {
for(int_k=0;int_k<size/2;int_k++) {
outb(base_io+1,*ptr++);
outb(base_io+2,*ptr++);
}
}
} else if (size > 0) {
if(int_c == 7) {
outb(base_io+7,0x18);
outb(base_io+7,0x19);
if(0x00 != (inb(base_io+7) & 0x01))
DSI_ERROR("program data not granted");
for(int_k = 0 ; int_k < size/3; int_k++) {
outb(base_io+1,*ptr++);
outb(base_io+2,0);
outb(base_io+1,*ptr++);
outb(base_io+2,*ptr++);
}
} else {
for(int_k = 0 ; int_k < size/3; int_k++) {
outb(base_io+0,*ptr++);
outb(base_io+1,*ptr++);
outb(base_io+2,*ptr++);
}
}
}
outb(base_io+7,0x11);
outb(base_io+7,3);
outb(base_io+4,data_0188 & 0xfb);
outb(base_io+3,data_0187);
return 0;
error:
printf("sio%d: DSI SoftModem microcode load failed: <%s>\n",ptr);
outb(base_io+7,0x00); \
outb(base_io+3,data_0187); \
outb(base_io+4,data_0188); \
return EIO;
}
#endif /* DSI_SOFT_MODEM */
#endif /* NSIO > 0 */
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