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freebsd-nq/sys/isa/sio.c
Bruce Evans 3b3bedbc0e Added some delays to the probe. This might fix some incompatible UARTs 
(the ones that take more than a few hundred nsec and less than 1 msec to
switch their IRQ output).
1996-02-25 21:10:54 +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 1.134 1996/01/25 07:21:36 phk Exp $
*/
#include "sio.h"
#include "opt_ddb.h"
/*
* 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.
*
* Changes for PC-Card integration:
* - Added PC-Card driver table and handlers
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/reboot.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/proc.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>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif
#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>
#ifdef COM_ESP
#include <i386/isa/ic/esp.h>
#endif
#include <i386/isa/ic/ns16550.h>
#include "crd.h"
#if NCRD > 0
#include <pccard/card.h>
#include <pccard/driver.h>
#include <pccard/slot.h>
#endif /* NCRD > 0 */
#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 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_LOSESOUTINTS(dev) ((dev)->id_flags & 0x08)
#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(), siopoll() and
* siostop())
* CS_TTGO = ~TS_TTSTOP (maintained by comparam() and comstart())
* 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 */
/* queue of linear buffers */
struct lbq {
u_char *l_head; /* next char to process */
u_char *l_tail; /* one past the last char to process */
struct lbq *l_next; /* next in queue */
bool_t l_queued; /* nonzero if queued */
};
/* 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 */
#ifdef COM_ESP
bool_t esp; /* is this unit a hayes esp board? */
#endif
u_char fifo_image; /* copy of value written to FIFO */
bool_t hasfifo; /* nonzero for 16550 UARTs */
bool_t loses_outints; /* nonzero if device loses output interrupts */
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 gone; /* hardware disappeared */
bool_t poll; /* nonzero if polling is required */
bool_t poll_output; /* nonzero if polling for output is required */
int unit; /* unit number */
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 */
struct lbq obufq; /* head of queue of output buffers */
struct lbq obufs[2]; /* output buffers */
Port_t data_port; /* i/o ports */
#ifdef COM_ESP
Port_t esp_port;
#endif
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];
/*
* Data area for output buffers. Someday we should build the output
* buffer queue without copying data.
*/
u_char obuf1[256];
u_char obuf2[256];
#ifdef DEVFS
void *devfs_token_ttyd;
void *devfs_token_ttyl;
void *devfs_token_ttyi;
void *devfs_token_cuaa;
void *devfs_token_cual;
void *devfs_token_cuai;
#endif
};
/*
* XXX public functions in drivers should be declared in headers produced
* by `config', not here.
*/
/* Interrupt handling entry points. */
inthand2_t siointrts;
void siopoll __P((void));
/* Device switch entry points. */
#define sioreset noreset
#define siommap nommap
#define siostrategy nostrategy
#ifdef COM_ESP
static int espattach __P((struct isa_device *isdp, struct com_s *com,
Port_t esp_port));
#endif
static int sioattach __P((struct isa_device *dev));
static timeout_t siodtrwakeup;
static void comhardclose __P((struct com_s *com));
static void siointr1 __P((struct com_s *com));
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 sioregisterdev __P((struct isa_device *id));
static void siosettimeout __P((void));
static void comstart __P((struct tty *tp));
static timeout_t comwakeup;
static void disc_optim __P((struct tty *tp, struct termios *t,
struct com_s *com));
#ifdef DSI_SOFT_MODEM
static int LoadSoftModem __P((int unit,int base_io, u_long size, u_char *ptr));
#endif /* DSI_SOFT_MODEM */
static char driver_name[] = "sio";
/* 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, driver_name
};
static d_open_t sioopen;
static d_close_t sioclose;
static d_read_t sioread;
static d_write_t siowrite;
static d_ioctl_t sioioctl;
static d_stop_t siostop;
static d_devtotty_t siodevtotty;
#define CDEV_MAJOR 28
static struct cdevsw sio_cdevsw = {
sioopen, sioclose, sioread, siowrite,
sioioctl, siostop, noreset, siodevtotty,
ttselect, nommap, NULL, driver_name,
NULL, -1,
};
static int comconsole = -1;
static speed_t comdefaultrate = TTYDEF_SPEED;
static u_int com_events; /* input chars + weighted output completions */
static int sio_timeout;
static int sio_timeouts_until_log;
#if 0 /* XXX */
static struct tty *sio_tty[NSIO];
#else
static struct tty sio_tty[NSIO];
#endif
static const int nsio_tty = NSIO;
#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 }
};
static struct kern_devconf kdc_sio[NSIO] = { {
0, 0, 0, /* filled in by dev_attach */
driver_name, 0, { MDDT_ISA, 0, "tty" },
isa_generic_externalize, 0, 0, ISA_EXTERNALLEN,
&kdc_isa0, /* parent */
0, /* parentdata */
DC_UNCONFIGURED, /* state */
"Serial port",
DC_CLS_SERIAL /* class */
} };
#ifdef COM_ESP
/* XXX configure this properly. */
static Port_t likely_com_ports[] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, };
static Port_t likely_esp_ports[] = { 0x140, 0x180, 0x280, 0 };
#endif
#if NCRD > 0
/*
* PC-Card (PCMCIA) specific code.
*/
static int card_intr(struct pccard_dev *); /* Interrupt handler */
static void siounload(struct pccard_dev *); /* Disable driver */
static void siosuspend(struct pccard_dev *); /* Suspend driver */
static int sioinit(struct pccard_dev *, int); /* init device */
static struct pccard_drv sio_info =
{
driver_name,
card_intr,
siounload,
siosuspend,
sioinit,
0, /* Attributes - presently unused */
&tty_imask /* Interrupt mask for device */
/* This should also include net_imask?? */
};
/*
* Called when a power down is wanted. Shuts down the
* device and configures the device as unavailable (but
* still loaded...). A resume is done by calling
* sioinit with first=0. This is called when the user suspends
* the system, or the APM code suspends the system.
*/
static void
siosuspend(struct pccard_dev *dp)
{
printf("sio%d: suspending\n", dp->isahd.id_unit);
}
/*
* Initialize the device - called from Slot manager.
* if first is set, then initially check for
* the device's existence before initialising it.
* Once initialised, the device table may be set up.
*/
int
sioinit(struct pccard_dev *dp, int first)
{
/*
* validate unit number.
*/
if (first)
{
if (dp->isahd.id_unit >= NSIO)
return(ENODEV);
/*
* Make sure it isn't already probed.
*/
if (com_addr(dp->isahd.id_unit))
return(EBUSY);
/*
* Probe the device. If a value is returned, the
* device was found at the location.
*/
if (sioprobe(&dp->isahd)==0)
return(ENXIO);
if (sioattach(&dp->isahd)==0)
return(ENXIO);
}
/*
* XXX TODO:
* If it was already inited before, the device structure
* should be already initialised. Here we should
* reset (and possibly restart) the hardware, but
* I am not sure of the best way to do this...
*/
return(0);
}
/*
* siounload - unload the driver and clear the table.
* XXX TODO:
* This is called usually when the card is ejected, but
* can be caused by the modunload of a controller driver.
* The idea is reset the driver's view of the device
* and ensure that any driver entry points such as
* read and write do not hang.
*/
static void
siounload(struct pccard_dev *dp)
{
struct com_s *com;
com = com_addr(dp->isahd.id_unit);
if (!com->iobase) {
printf("sio%d already unloaded!\n",dp->isahd.id_unit);
return;
}
kdc_sio[com->unit].kdc_state = DC_UNCONFIGURED;
kdc_sio[com->unit].kdc_description = "Serial port";
if (com->tp && (com->tp->t_state & TS_ISOPEN)) {
com->gone = 1;
printf("sio%d: unload\n", dp->isahd.id_unit);
com->tp->t_gen++;
ttyclose(com->tp);
ttwakeup(com->tp);
ttwwakeup(com->tp);
} else {
com_addr(com->unit) = NULL;
bzero(com, sizeof *com);
free(com,M_TTYS);
printf("sio%d: unload,gone\n", dp->isahd.id_unit);
}
}
/*
* card_intr - Shared interrupt called from
* front end of PC-Card handler.
*/
static int
card_intr(struct pccard_dev *dp)
{
struct com_s *com;
com = com_addr(dp->isahd.id_unit);
if (com && !com_addr(dp->isahd.id_unit)->gone)
siointr1(com_addr(dp->isahd.id_unit));
return(1);
}
#endif /* NCRD > 0 */
static void
sioregisterdev(id)
struct isa_device *id;
{
int unit;
unit = id->id_unit;
/*
* If already registered, don't try to re-register.
*/
if (kdc_sio[unit].kdc_isa)
return;
if (unit != 0)
kdc_sio[unit] = kdc_sio[0];
kdc_sio[unit].kdc_state = DC_UNCONFIGURED;
kdc_sio[unit].kdc_description = "Serial port";
kdc_sio[unit].kdc_unit = unit;
kdc_sio[unit].kdc_isa = id;
dev_attach(&kdc_sio[unit]);
}
static int
sioprobe(dev)
struct isa_device *dev;
{
static bool_t already_init;
bool_t failures[10];
int fn;
struct isa_device *idev;
Port_t iobase;
u_char mcr_image;
int result;
struct isa_device *xdev;
sioregisterdev(dev);
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 (xdev = isa_devtab_tty; xdev->id_driver != NULL; xdev++)
if (xdev->id_driver == &siodriver && xdev->id_enabled)
outb(xdev->id_iobase + com_mcr, 0);
#if NCRD > 0
/*
* If PC-Card probe required, then register driver with
* slot manager.
*/
pccard_add_driver(&sio_info);
#endif /* NCRD > 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();
/* EXTRA DELAY? */
/*
* 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) * 1000000 / (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.
*/
/* EXTRA DELAY? */
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.
*/
/* EXTRA DELAY? */
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) * 1000000 / (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.
*/
/* EXTRA DELAY? */
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.
*/
/* EXTRA DELAY? */
failures[0] = inb(iobase + com_cfcr) - CFCR_8BITS;
failures[1] = inb(iobase + com_ier) - IER_ETXRDY;
failures[2] = inb(iobase + com_mcr) - mcr_image;
DELAY(1000); /* XXX */
if (idev->id_irq != 0)
failures[3] = isa_irq_pending(idev) ? 0 : 1;
failures[4] = (inb(iobase + com_iir) & IIR_IMASK) - IIR_TXRDY;
DELAY(1000); /* XXX */
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);
DELAY(1000); /* XXX */
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);
}
#ifdef COM_ESP
static int
espattach(isdp, com, esp_port)
struct isa_device *isdp;
struct com_s *com;
Port_t esp_port;
{
u_char dips;
u_char val;
/*
* Check the ESP-specific I/O port to see if we're an ESP
* card. If not, return failure immediately.
*/
if ((inb(esp_port) & 0xf3) == 0) {
printf(" port 0x%x is not an ESP board?\n", esp_port);
return (0);
}
/*
* We've got something that claims to be a Hayes ESP card.
* Let's hope so.
*/
/* Get the dip-switch configuration */
outb(esp_port + ESP_CMD1, ESP_GETDIPS);
dips = inb(esp_port + ESP_STATUS1);
/*
* Bits 0,1 of dips say which COM port we are.
*/
if (com->iobase == likely_com_ports[dips & 0x03])
printf(" : ESP");
else {
printf(" esp_port has com %d\n", dips & 0x03);
return (0);
}
/*
* Check for ESP version 2.0 or later: bits 4,5,6 = 010.
*/
outb(esp_port + ESP_CMD1, ESP_GETTEST);
val = inb(esp_port + ESP_STATUS1); /* clear reg 1 */
val = inb(esp_port + ESP_STATUS2);
if ((val & 0x70) < 0x20) {
printf("-old (%o)", val & 0x70);
return (0);
}
/*
* Check for ability to emulate 16550: bit 7 == 1
*/
if ((dips & 0x80) == 0) {
printf(" slave");
return (0);
}
/*
* Okay, we seem to be a Hayes ESP card. Whee.
*/
com->esp = TRUE;
com->esp_port = esp_port;
return (1);
}
#endif /* COM_ESP */
static int
sioattach(isdp)
struct isa_device *isdp;
{
struct com_s *com;
dev_t dev;
#ifdef COM_ESP
Port_t *espp;
#endif
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->unit = unit;
com->cfcr_image = CFCR_8BITS;
com->dtr_wait = 3 * hz;
com->loses_outints = COM_LOSESOUTINTS(isdp) != 0;
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->obufs[0].l_head = com->obuf1;
com->obufs[1].l_head = com->obuf2;
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) {
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");
kdc_sio[unit].kdc_description =
"Serial port: Digicom Systems 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");
kdc_sio[unit].kdc_description =
"Serial port: National 8250 or compatible";
goto determined_type;
}
}
outb(iobase + com_fifo, FIFO_ENABLE | FIFO_RX_HIGH);
DELAY(100);
switch (inb(com->int_id_port) & IIR_FIFO_MASK) {
case FIFO_RX_LOW:
printf(" 16450");
kdc_sio[unit].kdc_description =
"Serial port: National 16450 or compatible";
break;
case FIFO_RX_MEDL:
printf(" 16450?");
kdc_sio[unit].kdc_description =
"Serial port: maybe National 16450";
break;
case FIFO_RX_MEDH:
printf(" 16550?");
kdc_sio[unit].kdc_description =
"Serial port: maybe National 16550";
break;
case FIFO_RX_HIGH:
printf(" 16550A");
if (COM_NOFIFO(isdp)) {
printf(" fifo disabled");
kdc_sio[unit].kdc_description =
"Serial port: National 16550A, FIFO disabled";
} else {
com->hasfifo = TRUE;
com->tx_fifo_size = 16;
kdc_sio[unit].kdc_description =
"Serial port: National 16550A or compatible";
#ifdef COM_ESP
for (espp = likely_esp_ports; *espp != 0; espp++)
if (espattach(isdp, com, *espp)) {
com->tx_fifo_size = 1024;
kdc_sio[unit].kdc_description =
"Serial port: Hayes ESP";
break;
}
#endif
}
#if 0
/*
* Check for the Startech ST16C650 chip.
* it has a shadow register under the com_iir,
* which can only be accessed when cfcr == 0xff
*/
{
u_char i, j;
i = inb(iobase + com_iir);
outb(iobase + com_cfcr, 0xff);
outb(iobase + com_iir, 0x0);
outb(iobase + com_cfcr, CFCR_8BITS);
j = inb(iobase + com_iir);
outb(iobase + com_iir, i);
if (i != j) {
printf(" 16550A");
} else {
com->tx_fifo_size = 32;
printf(" 16650");
kdc_sio[unit].kdc_description =
"Serial port: Startech 16C650 or similar";
}
if (!com->tx_fifo_size)
printf(" fifo disabled");
}
#endif
break;
}
#ifdef COM_ESP
if (com->esp) {
outb(iobase + com_fifo,
FIFO_DMA_MODE | FIFO_ENABLE | FIFO_RCV_RST | FIFO_XMT_RST
| FIFO_RX_MEDH);
/* Set 16550 compatibility mode. */
outb(com->esp_port + ESP_CMD1, ESP_SETMODE);
outb(com->esp_port + ESP_CMD2,
ESP_MODE_SCALE | ESP_MODE_RTS | ESP_MODE_FIFO);
/* Set RTS/CTS flow control. */
outb(com->esp_port + ESP_CMD1, ESP_SETFLOWTYPE);
outb(com->esp_port + ESP_CMD2, ESP_FLOW_RTS);
outb(com->esp_port + ESP_CMD2, ESP_FLOW_CTS);
/* Set flow-control levels. */
outb(com->esp_port + ESP_CMD1, ESP_SETRXFLOW);
outb(com->esp_port + ESP_CMD2, HIBYTE(768));
outb(com->esp_port + ESP_CMD2, LOBYTE(768));
outb(com->esp_port + ESP_CMD2, HIBYTE(512));
outb(com->esp_port + ESP_CMD2, LOBYTE(512));
}
#endif /* COM_ESP */
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");
kdc_sio[unit].kdc_state = (unit == comconsole) ? DC_BUSY : DC_IDLE;
#ifdef KGDB
if (kgdb_dev == makedev(CDEV_MAJOR, unit)) {
if (unit == 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_ctl_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);
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev, &sio_cdevsw, NULL);
#ifdef DEVFS
/* devsw, minor, type, uid, gid, perm, fmt, ... */
com->devfs_token_ttyd = devfs_add_devswf(&sio_cdevsw,
unit, DV_CHR, 0, 0, 0600, "ttyd%n", unit);
com->devfs_token_ttyi = devfs_add_devswf(&sio_cdevsw,
unit | CONTROL_INIT_STATE, DV_CHR, 0, 0, 0600, "ttyid%n", unit);
com->devfs_token_ttyl = devfs_add_devswf(&sio_cdevsw,
unit | CONTROL_LOCK_STATE, DV_CHR, 0, 0, 0600, "ttyld%n", unit);
com->devfs_token_cuaa = devfs_add_devswf(&sio_cdevsw,
unit | CALLOUT_MASK, DV_CHR, 0, 0, 0660, "cuaa%n", unit);
com->devfs_token_cuai = devfs_add_devswf(&sio_cdevsw,
unit | CALLOUT_MASK | CONTROL_INIT_STATE, DV_CHR, 0, 0, 0660,
"cuaia%n", unit);
com->devfs_token_cual = devfs_add_devswf(&sio_cdevsw,
unit | CALLOUT_MASK | CONTROL_LOCK_STATE, DV_CHR, 0, 0, 0660,
"cuala%n", unit);
#endif
return (1);
}
static 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 (com->gone)
return (ENXIO);
if (mynor & CONTROL_MASK)
return (0);
#if 0 /* XXX */
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 (com_addr(unit) == NULL)
return (ENXIO);
if (error != 0 || com->gone)
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 (com_addr(unit) == NULL)
return (ENXIO);
if (error != 0 || com->gone)
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;
(void)commctl(com, TIOCM_DTR | TIOCM_RTS, DMSET);
com->poll = com->no_irq;
com->poll_output = com->loses_outints;
++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
| com->fifo_image);
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".
*/
/*
* XXX `mynor & CALLOUT_MASK' should be
* `tp->t_cflag & (SOFT_CARRIER | TRAPDOOR_CARRIER) where
* TRAPDOOR_CARRIER is the default initial state for callout
* devices and SOFT_CARRIER is like CLOCAL except it hides
* the true carrier.
*/
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);
if (com_addr(unit) == NULL)
return (ENXIO);
--com->wopeners;
if (error != 0 || com->gone)
goto out;
goto open_top;
}
error = (*linesw[tp->t_line].l_open)(dev, tp);
disc_optim(tp, &tp->t_termios, com);
if (tp->t_state & TS_ISOPEN && mynor & CALLOUT_MASK)
com->active_out = TRUE;
siosettimeout();
out:
splx(s);
if (!(tp->t_state & TS_ISOPEN) && com->wopeners == 0)
comhardclose(com);
return (error);
}
static 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);
disc_optim(tp, &tp->t_termios, com);
siostop(tp, FREAD | FWRITE);
comhardclose(com);
ttyclose(tp);
siosettimeout();
splx(s);
if (com->gone) {
printf("sio%d: gone\n", com->unit);
s = spltty();
com_addr(com->unit) = 0;
bzero(tp,sizeof *tp);
bzero(com,sizeof *com);
free(com,M_TTYS);
splx(s);
}
return (0);
}
static void
comhardclose(com)
struct com_s *com;
{
Port_t iobase;
int s;
struct tty *tp;
int unit;
unit = com->unit;
iobase = com->iobase;
s = spltty();
com->poll = FALSE;
com->poll_output = 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(CDEV_MAJOR, 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)) {
(void)commctl(com, TIOCM_DTR, DMBIC);
if (com->dtr_wait != 0) {
timeout(siodtrwakeup, com, com->dtr_wait);
com->state |= CS_DTR_OFF;
}
}
}
if (com->hasfifo) {
/*
* Disable fifos so that they are off after controlled
* reboots. Some BIOSes fail to detect 16550s when the
* fifos are enabled.
*/
outb(iobase + com_fifo, 0);
}
com->active_out = FALSE;
wakeup(&com->active_out);
wakeup(TSA_CARR_ON(tp)); /* restart any wopeners */
if (!(com->state & CS_DTR_OFF) && unit != comconsole)
kdc_sio[unit].kdc_state = DC_IDLE;
splx(s);
}
static int
sioread(dev, uio, flag)
dev_t dev;
struct uio *uio;
int flag;
{
int mynor;
int unit;
struct tty *tp;
mynor = minor(dev);
if (mynor & CONTROL_MASK)
return (ENODEV);
unit = MINOR_TO_UNIT(mynor);
if (com_addr(unit)->gone)
return (ENODEV);
tp = com_addr(unit)->tp;
return ((*linesw[tp->t_line].l_read)(tp, uio, flag));
}
static 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);
if (com_addr(unit)->gone)
return (ENODEV);
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 != NULL && unit == 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;
if (com->unit != comconsole)
kdc_sio[com->unit].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
&& !com->gone
&& (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);
if (line_status & (LSR_PE|LSR_FE|LSR_BI)) {
#ifdef DDB
#ifdef BREAK_TO_DEBUGGER
if (line_status & LSR_BI
&& com->unit == comconsole) {
Debugger("serial console break");
goto cont;
}
#endif
#endif
/*
Don't store PE if IGNPAR and BI if IGNBRK,
this hack allows "raw" tty optimization
works even if IGN* is set.
*/
if ( com->tp == NULL
|| !(com->tp->t_state & TS_ISOPEN)
|| (line_status & (LSR_PE|LSR_FE))
&& (com->tp->t_iflag & IGNPAR)
|| (line_status & LSR_BI)
&& (com->tp->t_iflag & IGNBRK))
goto cont;
if ( (line_status & (LSR_PE|LSR_FE))
&& (com->tp->t_state & TS_CAN_BYPASS_L_RINT)
&& ((line_status & LSR_FE)
|| (line_status & LSR_PE)
&& (com->tp->t_iflag & INPCK)))
recv_data = 0;
}
++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 == NULL
|| !(com->tp->t_state & TS_ISOPEN))
&& kgdb_dev == makedev(CDEV_MAJOR, unit)) {
kgdb_connect(0);
continue;
}
#endif /* KGDB */
ioptr = com->iptr;
if (ioptr >= com->ibufend)
CE_RECORD(com, CE_INTERRUPT_BUF_OVERFLOW);
else {
++com_events;
schedsofttty();
#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);
if (line_status & LSR_OE)
CE_RECORD(com, CE_OVERRUN);
}
cont:
/*
* "& 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_BUSY | CS_TTGO | CS_ODEVREADY)) {
ioptr = com->obufq.l_head;
if (com->tx_fifo_size > 1) {
u_int ocount;
ocount = com->obufq.l_tail - 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->obufq.l_head = ioptr;
if (ioptr >= com->obufq.l_tail) {
struct lbq *qp;
qp = com->obufq.l_next;
qp->l_queued = FALSE;
qp = qp->l_next;
if (qp != NULL) {
com->obufq.l_head = qp->l_head;
com->obufq.l_tail = qp->l_tail;
com->obufq.l_next = qp;
} else {
/* output just completed */
com->state &= ~CS_BUSY;
}
if (!(com->state & CS_ODONE)) {
com_events += LOTS_OF_EVENTS;
com->state |= CS_ODONE;
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
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 mynor;
int s;
struct tty *tp;
#if defined(COMPAT_43) || defined(COMPAT_SUNOS)
int oldcmd;
struct termios term;
#endif
mynor = minor(dev);
com = com_addr(MINOR_TO_UNIT(mynor));
if (com->gone)
return (ENODEV);
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 defined(COMPAT_43) || defined(COMPAT_SUNOS)
term = tp->t_termios;
oldcmd = cmd;
error = ttsetcompat(tp, &cmd, data, &term);
if (error != 0)
return (error);
if (cmd != oldcmd)
data = (caddr_t)&term;
#endif
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);
s = spltty();
error = ttioctl(tp, cmd, data, flag);
disc_optim(tp, &tp->t_termios, com);
if (error >= 0) {
splx(s);
return (error);
}
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, TIOCM_DTR, DMBIS);
break;
case TIOCCDTR:
(void)commctl(com, TIOCM_DTR, DMBIC);
break;
case TIOCMSET:
(void)commctl(com, *(int *)data, DMSET);
break;
case TIOCMBIS:
(void)commctl(com, *(int *)data, DMBIS);
break;
case TIOCMBIC:
(void)commctl(com, *(int *)data, DMBIC);
break;
case TIOCMGET:
*(int *)data = commctl(com, 0, DMGET);
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);
}
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;
if (com->gone)
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 {
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_TBLOCK))
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) {
disable_intr();
com_events -= LOTS_OF_EVENTS;
com->state &= ~CS_ODONE;
if (!(com->state & CS_BUSY))
com->tp->t_state &= ~TS_BUSY;
enable_intr();
(*linesw[tp->t_line].l_start)(tp);
}
if (incc <= 0 || !(tp->t_state & TS_ISOPEN))
continue;
/*
* 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_state & TS_CAN_BYPASS_L_RINT) {
if (tp->t_rawq.c_cc + incc >= RB_I_HIGH_WATER
&& (com->state & CS_RTS_IFLOW
|| tp->t_iflag & IXOFF)
&& !(tp->t_state & TS_TBLOCK))
ttyblock(tp);
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;
comstart(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;
int txtimeout;
/* do historical conversions */
if (t->c_ispeed == 0)
t->c_ispeed = t->c_ospeed;
/* check requested parameters */
divisor = ttspeedtab(t->c_ospeed, comspeedtab);
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)
(void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */
else
(void)commctl(com, TIOCM_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->fifo_image = t->c_ospeed != 0 && t->c_ospeed <= 4800
? FIFO_ENABLE : FIFO_ENABLE | FIFO_RX_HIGH;
outb(iobase + com_fifo, com->fifo_image);
}
/*
* 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;
txtimeout = tp->t_timeout;
enable_intr();
while ((inb(com->line_status_port) & (LSR_TSRE | LSR_TXRDY))
!= (LSR_TSRE | LSR_TXRDY)) {
tp->t_state |= TS_SO_OCOMPLETE;
error = ttysleep(tp, TSA_OCOMPLETE(tp), TTIPRI | PCATCH,
"siotx", hz / 100);
if ( txtimeout != 0
&& (!error || error == EAGAIN)
&& (txtimeout -= hz / 100) <= 0
)
error = EIO;
if (com->gone)
error = ENODEV;
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_ODEVREADY;
com->state &= ~CS_CTS_OFLOW;
if (cflag & CCTS_OFLOW) {
com->state |= CS_CTS_OFLOW;
if (!(com->last_modem_status & MSR_CTS))
com->state &= ~CS_ODEVREADY;
}
/* XXX shouldn't call functions while intrs are disabled. */
disc_optim(tp, t, com);
/*
* 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_TBLOCK) {
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)) {
splx(s);
return;
}
if (tp->t_outq.c_cc != 0) {
struct lbq *qp;
struct lbq *next;
if (!com->obufs[0].l_queued) {
com->obufs[0].l_tail
= com->obuf1 + q_to_b(&tp->t_outq, com->obuf1,
sizeof com->obuf1);
com->obufs[0].l_next = NULL;
com->obufs[0].l_queued = TRUE;
disable_intr();
if (com->state & CS_BUSY) {
qp = com->obufq.l_next;
while ((next = qp->l_next) != NULL)
qp = next;
qp->l_next = &com->obufs[0];
} else {
com->obufq.l_head = com->obufs[0].l_head;
com->obufq.l_tail = com->obufs[0].l_tail;
com->obufq.l_next = &com->obufs[0];
com->state |= CS_BUSY;
}
enable_intr();
}
if (tp->t_outq.c_cc != 0 && !com->obufs[1].l_queued) {
com->obufs[1].l_tail
= com->obuf2 + q_to_b(&tp->t_outq, com->obuf2,
sizeof com->obuf2);
com->obufs[1].l_next = NULL;
com->obufs[1].l_queued = TRUE;
disable_intr();
if (com->state & CS_BUSY) {
qp = com->obufq.l_next;
while ((next = qp->l_next) != NULL)
qp = next;
qp->l_next = &com->obufs[1];
} else {
com->obufq.l_head = com->obufs[1].l_head;
com->obufq.l_tail = com->obufs[1].l_tail;
com->obufq.l_next = &com->obufs[1];
com->state |= CS_BUSY;
}
enable_intr();
}
tp->t_state |= TS_BUSY;
}
disable_intr();
if (com->state >= (CS_BUSY | CS_TTGO))
siointr1(com); /* fake interrupt to start output */
enable_intr();
ttwwakeup(tp);
splx(s);
}
static void
siostop(tp, rw)
struct tty *tp;
int rw;
{
struct com_s *com;
com = com_addr(DEV_TO_UNIT(tp->t_dev));
if (com->gone)
return;
disable_intr();
if (rw & FWRITE) {
com->obufs[0].l_queued = FALSE;
com->obufs[1].l_queued = FALSE;
if (com->state & CS_ODONE)
com_events -= LOTS_OF_EVENTS;
com->state &= ~(CS_ODONE | CS_BUSY);
com->tp->t_state &= ~TS_BUSY;
}
if (rw & FREAD) {
com_events -= (com->iptr - com->ibuf);
com->iptr = com->ibuf;
}
enable_intr();
comstart(tp);
/* XXX should clear h/w fifos too. */
}
static struct tty *
siodevtotty(dev)
dev_t dev;
{
int mynor;
int unit;
mynor = minor(dev);
if (mynor & CONTROL_MASK)
return (NULL);
unit = MINOR_TO_UNIT(mynor);
if ((u_int) unit >= NSIO)
return (NULL);
return (&sio_tty[unit]);
}
static int
commctl(com, bits, how)
struct com_s *com;
int bits;
int how;
{
int mcr;
int msr;
if (how == DMGET) {
bits = TIOCM_LE; /* XXX - always enabled while open */
mcr = com->mcr_image;
if (mcr & MCR_DTR)
bits |= TIOCM_DTR;
if (mcr & MCR_RTS)
bits |= TIOCM_RTS;
msr = com->prev_modem_status;
if (msr & MSR_CTS)
bits |= TIOCM_CTS;
if (msr & MSR_DCD)
bits |= TIOCM_CD;
if (msr & MSR_DSR)
bits |= 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))
bits |= TIOCM_RI;
return (bits);
}
mcr = 0;
if (bits & TIOCM_DTR)
mcr |= MCR_DTR;
if (bits & TIOCM_RTS)
mcr |= MCR_RTS;
if (com->gone)
return(0);
disable_intr();
switch (how) {
case DMSET:
outb(com->modem_ctl_port,
com->mcr_image = mcr | (com->mcr_image & MCR_IENABLE));
break;
case DMBIS:
outb(com->modem_ctl_port, com->mcr_image |= mcr);
break;
case DMBIC:
outb(com->modem_ctl_port, com->mcr_image &= ~mcr);
break;
}
enable_intr();
return (0);
}
static void
siosettimeout()
{
struct com_s *com;
bool_t someopen;
int unit;
/*
* Set our timeout period to 1 second if no polled devices are open.
* Otherwise set it to max(1/200, 1/hz).
* Enable timeouts iff some device is open.
*/
untimeout(comwakeup, (void *)NULL);
sio_timeout = hz;
someopen = FALSE;
for (unit = 0; unit < NSIO; ++unit) {
com = com_addr(unit);
if (com != NULL && com->tp != NULL
&& com->tp->t_state & TS_ISOPEN && !com->gone) {
someopen = TRUE;
if (com->poll || com->poll_output) {
sio_timeout = hz > 200 ? hz / 200 : 1;
break;
}
}
}
if (someopen) {
sio_timeouts_until_log = hz / sio_timeout;
timeout(comwakeup, (void *)NULL, sio_timeout);
} else {
/* Flush error messages, if any. */
sio_timeouts_until_log = 1;
comwakeup((void *)NULL);
untimeout(comwakeup, (void *)NULL);
}
}
static void
comwakeup(chan)
void *chan;
{
struct com_s *com;
int unit;
timeout(comwakeup, (void *)NULL, sio_timeout);
/*
* 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->gone
&& (com->state >= (CS_BUSY | CS_TTGO) || com->poll)) {
disable_intr();
siointr1(com);
enable_intr();
}
}
/*
* Check for and log errors, but not too often.
*/
if (--sio_timeouts_until_log > 0)
return;
sio_timeouts_until_log = hz / sio_timeout;
for (unit = 0; unit < NSIO; ++unit) {
int errnum;
com = com_addr(unit);
if (com == NULL)
continue;
if (com->gone)
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);
}
}
}
static void
disc_optim(tp, t, com)
struct tty *tp;
struct termios *t;
struct com_s *com;
{
if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
&& (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
&& (!(t->c_iflag & PARMRK)
|| (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
&& !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
&& linesw[tp->t_line].l_rint == ttyinput)
tp->t_state |= TS_CAN_BYPASS_L_RINT;
else
tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
/*
* Prepare to reduce input latency for packet
* discplines with a end of packet character.
*/
if (tp->t_line == SLIPDISC)
com->hotchar = 0xc0;
else if (tp->t_line == PPPDISC)
com->hotchar = 0x7e;
else
com->hotchar = 0;
}
/*
* Following are all routines needed for SIO to act as console
*/
#include <machine/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;
/* XXX: ick */
unit = DEV_TO_UNIT(CONUNIT);
siocniobase = CONADDR;
/* make sure hardware exists? XXX */
/* initialize required fields */
cp->cn_dev = makedev(CDEV_MAJOR, unit);
#ifdef COMCONSOLE
cp->cn_pri = CN_REMOTE; /* Force a serial port console */
#else
cp->cn_pri = (boothowto & RB_SERIAL) ? CN_REMOTE : CN_NORMAL;
#endif
}
void
siocninit(cp)
struct consdev *cp;
{
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",unit,ptr);
outb(base_io+7,0x00); \
outb(base_io+3,data_0187); \
outb(base_io+4,data_0188); \
return EIO;
}
#endif /* DSI_SOFT_MODEM */
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