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freebsd-dev/sys/i386/isa/loran.c

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/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* $Id: loran.c,v 1.3 1998/04/05 19:26:08 phk Exp $
*
* This device-driver helps the userland controlprogram for a LORAN-C
* receiver avoid monopolizing the CPU.
*
* This is clearly a candidate for the "most weird hardware support in
* FreeBSD" prize. At this time only two copies of the receiver are
* known to exist in the entire world.
*
* Details can be found at:
* ftp://ftp.eecis.udel.edu/pub/ntp/loran.tar.Z
*
*/
#ifdef KERNEL
#include "loran.h"
#include "opt_devfs.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <sys/syslog.h>
#include <sys/time.h>
#include <sys/malloc.h>
#ifdef DEVFS
#include <sys/devfsext.h>
#endif /*DEVFS*/
#include <i386/isa/isa_device.h>
#endif /* KERNEL */
struct datapoint {
void *ident;
int index;
u_int64_t scheduled;
u_int delay;
u_int code;
u_int gri;
u_int agc;
u_int phase;
u_int par;
u_int isig;
u_int qsig;
u_int ssig;
u_int64_t epoch;
struct timespec actual;
TAILQ_ENTRY(datapoint) list;
double ival;
double qval;
double mval;
};
/*
* Mode register (PAR) hardware definitions
*/
#define INTEG 0x03 /* integrator mask */
#define INTEG_1000us 0
#define INTEG_264us 1
#define INTEG_36us 2
#define INTEG_SHORT 3
#define GATE 0x0C /* gate source mask */
#define GATE_OPEN 0x4
#define GATE_GRI 0x8
#define GATE_PCI 0xc
#define GATE_STB 0xf
#define MSB 0x10 /* load dac high-order bits */
#define IEN 0x20 /* enable interrupt bit */
#define EN5 0x40 /* enable counter 5 bit */
#define ENG 0x80 /* enable gri bit */
#ifdef KERNEL
#define VCO 2048 /* initial vco dac (0 V)*/
#define PORT 0x0300 /* controller port address */
#define PGUARD 990 /* program guard time (cycle) (990!) */
#define GRI 800 /* pulse-group gate (cycle) */
/*
* Analog/digital converter (ADC) hardware definitions
*/
#define ADC PORT+2 /* adc buffer (r)/address (w) */
#define ADCGO PORT+3 /* adc status (r)/adc start (w) */
#define ADC_START 0x01 /* converter start bit (w) */
#define ADC_BUSY 0x01 /* converter busy bit (r) */
#define ADC_DONE 0x80 /* converter done bit (r) */
#define ADC_I 0 /* i channel (phase) */
#define ADC_Q 1 /* q channel (amplitude) */
#define ADC_S 2 /* s channel (agc) */
/*
* Digital/analog converter (DAC) hardware definitions
* Note: output voltage increases with value programmed; the buffer
* is loaded in two 8-bit bytes, the lsb 8 bits with the MSB bit off in
* the PAR register, the msb 4 bits with the MSB on.
*/
#define DACA PORT+4 /* vco (dac a) buffer (w) */
#define DACB PORT+5 /* agc (dac b) buffer (w) */
/*
* Pulse-code generator (CODE) hardware definitions
* Note: bits are shifted out from the lsb first
*/
#define CODE PORT+6 /* pulse-code buffer (w) */
#define MPCA 0xCA /* LORAN-C master pulse code group a */
#define MPCB 0x9F /* LORAN-C master pulse code group b */
#define SPCA 0xF9 /* LORAN-C slave pulse code group a */
#define SPCB 0xAC /* LORAN-C slave pulse code group b */
/*
* Mode register (PAR) hardware definitions
*/
#define PAR PORT+7 /* parameter buffer (w) */
#define TGC PORT+0 /* stc control port (r/w) */
#define TGD PORT+1 /* stc data port (r/w) */
/*
* Timing generator (STC) hardware commands
*/
/* argument sssss = counter numbers 5-1 */
#define TG_LOADDP 0x00 /* load data pointer */
/* argument ee = element (all groups except ggg = 000 or 111) */
#define MODEREG 0x00 /* mode register */
#define LOADREG 0x08 /* load register */
#define HOLDREG 0x10 /* hold register */
#define HOLDINC 0x18 /* hold register (hold cycle increm) */
/* argument ee = element (group ggg = 111) */
#define ALARM1 0x07 /* alarm register 1 */
#define ALARM2 0x0F /* alarm register 2 */
#define MASTER 0x17 /* master mode register */
#define STATUS 0x1F /* status register */
#define ARM 0x20 /* arm counters */
#define LOAD 0x40 /* load counters */
#define TG_LOADARM 0x60 /* load and arm counters */
#define DISSAVE 0x80 /* disarm and save counters */
#define TG_SAVE 0xA0 /* save counters */
#define DISARM 0xC0 /* disarm counters */
/* argument nnn = counter number */
#define SETTOG 0xE8 /* set toggle output HIGH for counter */
#define CLRTOG 0xE0 /* set toggle output LOW for counter */
#define STEP 0xF0 /* step counter */
/* argument eeggg, where ee = element, ggg - counter group */
/* no arguments */
#define ENABDPS 0xE0 /* enable data pointer sequencing */
#define ENABFOUT 0xE6 /* enable fout */
#define ENAB8 0xE7 /* enable 8-bit data bus */
#define DSABDPS 0xE8 /* disable data pointer sequencing */
#define ENAB16 0xEF /* enable 16-bit data bus */
#define DSABFOUT 0xEE /* disable fout */
#define ENABPFW 0xF8 /* enable prefetch for write */
#define DSABPFW 0xF9 /* disable prefetch for write */
#define TG_RESET 0xFF /* master reset */
#define NENV 40 /* size of envelope filter */
#define CLOCK 50 /* clock period (clock) */
#define CYCLE 10 /* carrier period (us) */
#define PCX (NENV * CLOCK) /* envelope gate (clock) */
#define STROBE 50 /* strobe gate (clock) */
u_short tg_init[] = { /* stc initialization vector */
0x0562, 12, 13, /* counter 1 (p0) */
0x0262, PGUARD, GRI, /* counter 2 (gri) */
0x8562, PCX, 5000 - PCX, /* counter 3 (pcx) */
0xc562, 0, STROBE, /* counter 4 (stb) */
0x052a, 0, 0 /* counter 5 (out) */
};
/**********************************************************************/
static TAILQ_HEAD(qhead, datapoint) qdone, qready;
static struct datapoint dummy;
static u_int64_t ticker;
static u_char par;
static struct datapoint *this, *next;
static MALLOC_DEFINE(M_LORAN, "Loran", "Loran datapoints");
static int loranerror;
static char lorantext[40];
/**********************************************************************/
static int loranprobe (struct isa_device *dvp);
static int loranattach (struct isa_device *isdp);
static void loranenqueue (struct datapoint *);
static d_open_t loranopen;
static d_close_t loranclose;
static d_read_t loranread;
static d_write_t loranwrite;
extern struct timecounter loran_timecounter[];
/**********************************************************************/
int
loranprobe(struct isa_device *dvp)
{
/* We need to be a "fast-intr" */
dvp->id_ri_flags |= RI_FAST;
dvp->id_iobase = PORT;
return (8);
}
int
loranattach(struct isa_device *isdp)
{
int i;
/* We need to be a "fast-intr" */
isdp->id_ri_flags |= RI_FAST;
printf("loran0: LORAN-C Receiver\n");
/* Initialize the 9513A */
outb(TGC, TG_RESET); outb(TGC, LOAD+0x1f); /* reset STC chip */
outb(TGC, TG_LOADDP+MASTER); outb(TGD, 0xf0); outb(TGD, 0x8a);
outb(TGC, TG_LOADDP+1);
tg_init[4] = 7499 - GRI;
for (i = 0; i < 5*3; i++) {
outb(TGD, tg_init[i]);
outb(TGD, tg_init[i] >> 8);
}
outb(TGC, TG_LOADARM+0x1f); /* let the good times roll */
/* Load the VCO DAC */
outb(PAR, 0); outb(DACA, VCO & 0xff);
outb(PAR, MSB); outb(DACA, VCO >> 8);
init_timecounter(loran_timecounter);
TAILQ_INIT(&qdone);
TAILQ_INIT(&qready);
dummy.agc = 2000;
dummy.code = 0x55;
dummy.delay = PGUARD - GRI;
TAILQ_INSERT_HEAD(&qready, &dummy, list);
this = &dummy;
next = &dummy;
inb(ADC); /* Flush any old result */
outb(ADC, ADC_S);
par = ENG|IEN;
outb(PAR, par);
return (1);
}
static int
loranopen (dev_t dev, int flags, int fmt, struct proc *p)
{
u_long ef;
struct datapoint *this;
while (!TAILQ_EMPTY(&qdone)) {
ef = read_eflags();
disable_intr();
this = TAILQ_FIRST(&qdone);
TAILQ_REMOVE(&qdone, this, list);
write_eflags(ef);
FREE(this, M_LORAN);
}
loranerror = 0;
return(0);
}
static int
loranclose(dev_t dev, int flags, int fmt, struct proc *p)
{
/*
* Lower ENG
*/
return(0);
}
static int
loranread(dev_t dev, struct uio * uio, int ioflag)
{
u_long ef;
struct datapoint *this;
int err, c;
if (loranerror) {
printf("Loran0: %s", lorantext);
return(EIO);
}
if (TAILQ_EMPTY(&qdone))
tsleep ((caddr_t)&qdone, PZERO + 8 |PCATCH, "loranrd", hz*2);
if (TAILQ_EMPTY(&qdone))
return(0);
this = TAILQ_FIRST(&qdone);
ef = read_eflags();
disable_intr();
TAILQ_REMOVE(&qdone, this, list);
write_eflags(ef);
c = imin(uio->uio_resid, (int)sizeof *this);
err = uiomove((caddr_t)this, c, uio);
FREE(this, M_LORAN);
return(err);
}
static void
loranenqueue(struct datapoint *this)
{
struct datapoint *p, *q;
u_long ef;
u_int64_t x;
if (this->scheduled < ticker) {
x = (ticker - this->scheduled) / (2 * this->gri);
this->scheduled += x * 2 * this->gri;
}
ef = read_eflags();
disable_intr();
p = TAILQ_FIRST(&qready);
while (1) {
while (this->scheduled < p->scheduled + PGUARD)
this->scheduled += 2 * this->gri;
q = TAILQ_NEXT(p, list);
if (!q) {
this->delay = this->scheduled - p->scheduled - GRI;
TAILQ_INSERT_TAIL(&qready, this, list);
break;
}
if (this->scheduled + PGUARD < q->scheduled) {
this->delay = this->scheduled - p->scheduled - GRI;
TAILQ_INSERT_BEFORE(q, this, list);
q->delay = q->scheduled - this->scheduled - GRI;
break;
}
p = q;
}
write_eflags(ef);
}
static int
loranwrite(dev_t dev, struct uio * uio, int ioflag)
{
int err = 0, c;
struct datapoint *this;
MALLOC(this, struct datapoint *, sizeof *this, M_LORAN, M_WAITOK);
c = imin(uio->uio_resid, (int)sizeof *this);
err = uiomove((caddr_t)this, c, uio);
if (!err && this->gri == 0)
err = EINVAL;
if (!err)
loranenqueue(this);
else
FREE(this, M_LORAN);
return(err);
}
void
loranintr(int unit)
{
u_long ef;
int status, count = 0;
ef = read_eflags();
disable_intr();
this->ssig = inb(ADC);
par &= ~(ENG | IEN);
outb(PAR, par);
outb(ADC, ADC_I);
outb(ADCGO, ADC_START);
while (!(inb(ADCGO) & ADC_DONE))
continue;
this->isig = inb(ADC);
outb(ADC, ADC_Q);
outb(ADCGO, ADC_START);
while (!(inb(ADCGO) & ADC_DONE))
continue;
this->qsig = inb(ADC);
outb(ADC, ADC_S);
this->epoch = ticker;
if (this != &dummy) {
nanotime(&this->actual); /* XXX */
TAILQ_INSERT_TAIL(&qdone, this, list);
wakeup((caddr_t)&qdone);
}
if (next != &dummy || TAILQ_NEXT(next, list))
TAILQ_REMOVE(&qready, next, list);
this = next;
ticker += GRI;
ticker += this->delay;
next = TAILQ_FIRST(&qready);
if (!next) {
next = &dummy;
TAILQ_INSERT_HEAD(&qready, next, list);
} else if (next->delay + GRI > PGUARD * 2) {
next->delay -= PGUARD;
next = &dummy;
TAILQ_INSERT_HEAD(&qready, next, list);
}
if (next == &dummy)
next->scheduled = ticker + GRI + next->delay;
/* load this->params */
par &= ~(INTEG|GATE);
par |= this->par;
par &= ~MSB; outb(PAR, par); outb(DACB, this->agc);
par |= MSB; outb(PAR, par); outb(DACB, this->agc>>8);
switch (this->code) {
case 256+0: outb(CODE, MPCA); break;
case 256+1: outb(CODE, MPCB); break;
case 256+2: outb(CODE, SPCA); break;
case 256+3: outb(CODE, SPCB); break;
default: outb(CODE, this->code); break;
}
outb(TGC, TG_LOADDP + 0x0c);
outb(TGD, this->phase);
outb(TGD, this->phase >> 8);
/* load next->delay into 9513 */
outb(TGC, TG_LOADDP + 0x0a);
outb(TGD, next->delay);
outb(TGD, next->delay >> 8);
status = inb(TGC);
status &= 0x1c;
if (status) {
outb(TGC, TG_SAVE + 2); /* save counter #2 */
outb(TGC, TG_LOADDP +0x12); /* hold counter #2 */
count = inb(TGD & 0xff);
count |= inb(TGD) << 8;
outb(TGC, TG_LOADDP +0x12); /* hold counter #2 */
outb(TGD, GRI & 0xff);
outb(TGD, GRI >> 8);
}
par |= ENG | IEN;
outb(PAR, par);
if (status) {
sprintf(lorantext, "Missed: %02x %d %d\n",
status, count, next->delay);
loranerror = 1;
}
if (next->delay < PGUARD - GRI) {
sprintf(lorantext, "Bogus: %02x %d %d\n",
status, count, next->delay);
loranerror = 1;
}
write_eflags(ef);
}
/**********************************************************************/
static u_int64_t
loran_get_timecount(void)
{
u_int32_t count;
u_long ef;
u_int high, low;
ef = read_eflags();
disable_intr();
outb(TGC, TG_SAVE + 0x10); /* save counter #5 */
outb(TGC, TG_LOADDP +0x15); /* hold counter #5 */
count = inb(TGD);
count |= inb(TGD) << 8;
write_eflags(ef);
return (count);
}
static struct timecounter loran_timecounter[3] = {
0, /* get_timedelta */
loran_get_timecount, /* get_timecount */
0xffff, /* counter_mask */
5000000, /* frequency */
"loran" /* name */
};
SYSCTL_OPAQUE(_debug, OID_AUTO, loran_timecounter, CTLFLAG_RD,
loran_timecounter, sizeof(loran_timecounter), "S,timecounter", "");
/**********************************************************************/
struct isa_driver lorandriver = {
loranprobe, loranattach, "loran"
};
#define CDEV_MAJOR 94
static struct cdevsw loran_cdevsw =
{ loranopen, loranclose, loranread, loranwrite,
noioctl, nullstop, nullreset, nodevtotty,
seltrue, nommap, nostrat, "loran",
NULL, -1 };
static loran_devsw_installed = 0;
static void loran_drvinit(void *unused)
{
dev_t dev;
if( ! loran_devsw_installed ) {
dev = makedev(CDEV_MAJOR, 0);
cdevsw_add(&dev,&loran_cdevsw, NULL);
loran_devsw_installed = 1;
}
}
SYSINIT(lorandev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,loran_drvinit,NULL)
#endif /* KERNEL */
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