Date: Fri, 05 Sep 1997 18:58:11 -0700 From: Julian Elischer <julian@whistle.com> To: hackers@freebsd.org Subject: [BDE:] sio.c proposed change. (HISPEED uarts) Message-ID: <3410B8B3.59E2B600@whistle.com>
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Bruce, (and others)
here's a version of the changes I submitted before.
I've changed it so that the stored value is the maximum
baud rate
(the rate when the divisor == 1)
I'm still not sure that we need to limit ourselves to
the 'standard' rates via a table, so I still have not yet
re-introduced the speed table.
As I mentionned before,
ths is relative to 2.2 and also
brings over a few -current enhancements WRT
the attacming of a console.
the purpose of these changes is to allow the supprt of 'overclocked'
sio ports.
thoughts?
julian
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Index: sio.c
===================================================================
RCS file: /home/ncvs/src/sys/i386/isa/sio.c,v
retrieving revision 1.147.2.8
retrieving revision 1.147.2.8.2.2
diff -c -r1.147.2.8 -r1.147.2.8.2.2
*** sio.c 1997/05/11 12:57:38 1.147.2.8
--- sio.c 1997/09/06 01:42:37 1.147.2.8.2.2
***************
*** 31,37 ****
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
! * $Id: sio.c,v 1.147.2.8 1997/05/11 12:57:38 bde Exp $
*/
#include "opt_comconsole.h"
--- 31,37 ----
* SUCH DAMAGE.
*
* from: @(#)com.c 7.5 (Berkeley) 5/16/91
! * $Id: sio.c,v 1.147.2.8.2.2 1997/09/06 01:42:37 julian Exp $
*/
#include "opt_comconsole.h"
***************
*** 61,66 ****
--- 61,67 ----
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/syslog.h>
+ #include <sys/sysctl.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif
***************
*** 94,99 ****
--- 95,101 ----
#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)
+ #define BASIC_BAUD_MAX 115200
#ifdef COM_MULTIPORT
/* checks in flags for multiport and which is multiport "master chip"
***************
*** 104,112 ****
--- 106,118 ----
#define COM_NOTAST4(dev) ((dev)->id_flags & 0x04)
#endif /* COM_MULTIPORT */
+ #define COM_CONSOLE(dev) ((dev)->id_flags & 0x10)
+ #define COM_FORCECONSOLE(dev) ((dev)->id_flags & 0x20)
+ #define COM_LLCONSOLE(dev) ((dev)->id_flags & 0x40)
#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_BAUD_MULTIPLE(dev) ((((dev)->id_flags >> 20) & 0x0F) + 1)
#define com_scr 7 /* scratch register for 16450-16550 (R/W) */
***************
*** 195,200 ****
--- 201,207 ----
int unit; /* unit number */
int dtr_wait; /* time to hold DTR down on close (* 1/hz) */
u_int tx_fifo_size;
+ u_int baud_max; /* maximum baud rate, (divisor = 1) */
u_int wopeners; /* # processes waiting for DCD in open() */
/*
***************
*** 331,336 ****
--- 338,345 ----
};
static int comconsole = -1;
+ static Port_t siocniobase;
+ int siocn_baud_max = BASIC_BAUD_MAX ; /* set from vendor code */
static speed_t comdefaultrate = CONSPEED;
static u_int com_events; /* input chars + weighted output completions */
static int sio_timeout;
***************
*** 342,375 ****
#endif
static const int nsio_tty = NSIO;
- 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 }
- };
-
#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.
--- 351,424 ----
#endif
static const int nsio_tty = NSIO;
#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
+ /*
+ * handle sysctl read/write requests for console speed
+ *
+ * In addition to setting comdefaultrate for I/O through /dev/console,
+ * also set the initial and lock values for the /dev/ttyXX device
+ * if there is one associated with the console. Finally, if the /dev/tty
+ * device has already been open, change the speed on the open running port
+ * itself.
+ */
+
+ static int
+ sysctl_machdep_comdefaultrate SYSCTL_HANDLER_ARGS
+ {
+ int error, s;
+ speed_t newspeed;
+ struct com_s *com;
+ struct tty *tp;
+
+ newspeed = comdefaultrate;
+
+ error = sysctl_handle_opaque(oidp, &newspeed, sizeof newspeed, req);
+ if (error || !req->newptr)
+ return (error);
+
+ comdefaultrate = newspeed;
+
+ if (comconsole < 0) /* serial console not selected? */
+ return (0);
+
+ com = com_addr(comconsole);
+ if (!com)
+ return (ENXIO);
+
+ /*
+ * set the initial and lock rates for /dev/ttydXX and /dev/cuaXX
+ * (note, the lock rates really are boolean -- if non-zero, disallow
+ * speed changes)
+ * XXX for now don't do the lock speeds [JRE]
+ */
+ com->lt_in.c_ispeed = com->lt_in.c_ospeed =
+ com->lt_out.c_ispeed = com->lt_out.c_ospeed = 0;
+ com->it_in.c_ispeed = com->it_in.c_ospeed =
+ com->it_out.c_ispeed = com->it_out.c_ospeed =
+ comdefaultrate;
+
+ /*
+ * if we're open, change the running rate too
+ */
+ tp = com->tp;
+ if (tp && (tp->t_state & TS_ISOPEN)) {
+ tp->t_termios.c_ispeed =
+ tp->t_termios.c_ospeed = comdefaultrate;
+ s = spltty();
+ error = comparam(tp, &tp->t_termios);
+ splx(s);
+ }
+ return error;
+ }
+
+ SYSCTL_PROC(_machdep, OID_AUTO, conspeed, CTLTYPE_INT | CTLFLAG_RW,
+ 0, 0, sysctl_machdep_comdefaultrate, "I", "");
+
#if NCRD > 0
/*
* PC-Card (PCMCIA) specific code.
***************
*** 572,582 ****
* 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 | CFCR_8BITS);
! 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
--- 621,635 ----
* 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.
*/
! if (iobase == siocniobase)
! DELAY((16 + 1) * 1000000 / (comdefaultrate / 10));
! else {
! outb(iobase + com_cfcr, CFCR_DLAB | CFCR_8BITS);
! 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
***************
*** 810,818 ****
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;
com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
! } else
com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED;
termioschars(&com->it_in);
com->it_out = com->it_in;
--- 863,880 ----
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;
+ /*
+ * The initial rates equal the console rate
+ * but the value is not locked
+ */
+ com->lt_out.c_ispeed = com->lt_out.c_ospeed =
+ com->lt_in.c_ispeed = com->lt_in.c_ospeed = 0;
com->it_in.c_ispeed = com->it_in.c_ospeed = comdefaultrate;
! com->baud_max = siocn_baud_max;
! } else {
! com->baud_max = COM_BAUD_MULTIPLE(isdp) * BASIC_BAUD_MAX;
com->it_in.c_ispeed = com->it_in.c_ospeed = TTYDEF_SPEED;
+ }
termioschars(&com->it_in);
com->it_out = com->it_in;
***************
*** 938,943 ****
--- 1000,1007 ----
COM_MPMASTER(isdp))->id_irq == 0;
}
#endif /* COM_MULTIPORT */
+ if (unit == comconsole)
+ printf(", console");
printf("\n");
s = spltty();
***************
*** 1868,1873 ****
--- 1932,1981 ----
goto repeat;
}
+ /*
+ * given the xtal speed, and a multiple and a speed,
+ * work out the nearest clock-dividor, or return an error
+ * if there isn't one within about 4% of the required speed.
+ * returns the speed adjusted to the correct nearest value as well.
+ * Probably needs less magic numbers.
+ */
+ static int
+ makedivisor( speed_t *speed, int *divisorp, int baud_max)
+ {
+ int check, divisor;
+
+ if (*speed == 0) {
+ divisor = 0;
+ } else {
+ /*
+ * Calculate the divisor.
+ * Make it 2 x and then use rounding, rather than use
+ * a direct truncation, after all, the correct
+ * divisor might be 0.001 higher.
+ */
+ divisor = (baud_max * 2) / (*speed);
+
+ divisor = (divisor + 1) >> 1; /* round up or down */
+ /*
+ * the specs usually say that a speed
+ * must be (+ or -) 5%
+ * to be acceptable. We'll use 4%.
+ */
+ check = (100 * divisor * (*speed)) /(baud_max);
+ if ((check < 96) || (check > 104)) {
+ return (EINVAL); /* not close enough */
+ }
+
+ /*
+ * Make the reported speed show what we
+ * are actually doing.
+ */
+ *speed = (baud_max)/divisor;
+ }
+ *divisorp = divisor;
+ return (0);
+ }
+
static int
comparam(tp, t)
struct tty *tp;
***************
*** 1885,1903 ****
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 */
--- 1993,2020 ----
int unit;
int txtimeout;
+ unit = DEV_TO_UNIT(tp->t_dev);
+ com = com_addr(unit);
+ iobase = com->iobase;
+
/* do historical conversions */
if (t->c_ispeed == 0)
t->c_ispeed = t->c_ospeed;
/* check requested parameters */
! if(com->baud_max == 0) { /* catch 0 as well */
! com->baud_max = BASIC_BAUD_MAX;
! printf("sio%d: warning, baud multiple was 0\n", unit);
! }
! error = makedivisor( &(t->c_ospeed), &divisor , com->baud_max);
! if (error)
! return error;
! t->c_ispeed = t->c_ospeed;
! if (divisor <= 0) {
return (EINVAL);
+ }
/* parameters are OK, convert them to the com struct and the device */
s = spltty();
if (divisor == 0)
(void)commctl(com, TIOCM_DTR, DMBIC); /* hang up line */
***************
*** 2394,2400 ****
u_char mcr;
};
- static Port_t siocniobase;
static void siocnclose __P((struct siocnstate *sp));
static void siocnopen __P((struct siocnstate *sp));
--- 2511,2516 ----
***************
*** 2444,2450 ****
* data input register. This also reduces the effects of the
* UMC8669F bug.
*/
! divisor = ttspeedtab(comdefaultrate, comspeedtab);
dlbl = divisor & 0xFF;
if (sp->dlbl != dlbl)
outb(iobase + com_dlbl, dlbl);
--- 2560,2566 ----
* data input register. This also reduces the effects of the
* UMC8669F bug.
*/
! makedivisor( &comdefaultrate, &divisor , siocn_baud_max);
dlbl = divisor & 0xFF;
if (sp->dlbl != dlbl)
outb(iobase + com_dlbl, dlbl);
***************
*** 2489,2509 ****
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
--- 2605,2647 ----
siocnprobe(cp)
struct consdev *cp;
{
! struct isa_device *dvp;
! int s;
! struct siocnstate sp;
!
! /*
! * Find our first enabled console, if any. If it is a high-level
! * console device, then initialize it and return successfully.
! * If it is a low-level console device, then initialize it and
! * return unsuccessfully. It must be initialized in both cases
! * for early use by console drivers and debuggers. Initializing
! * the hardware is not necessary in all cases, since the i/o
! * routines initialize it on the fly, but it is necessary if
! * input might arrive while the hardware is switched back to an
! * uninitialized state. We can't handle multiple console devices
! * yet because our low-level routines don't take a device arg.
! * We trust the user to set the console flags properly so that we
! * don't need to probe.
! */
! cp->cn_pri = CN_DEAD;
! for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++)
! if ((dvp->id_driver == &siodriver)
! && (dvp->id_enabled)
! && (COM_CONSOLE(dvp))) {
! siocniobase = dvp->id_iobase;
! siocn_baud_max
! = COM_BAUD_MULTIPLE(dvp) * BASIC_BAUD_MAX;
! s = spltty();
! siocnopen(&sp);
! splx(s);
! if (!COM_LLCONSOLE(dvp)) {
! cp->cn_dev = makedev(CDEV_MAJOR, dvp->id_unit);
! cp->cn_pri = COM_FORCECONSOLE(dvp)
! || boothowto & RB_SERIAL
! ? CN_REMOTE : CN_NORMAL;
! }
! break;
! }
}
void
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