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91266b96c4
freebsd/sys/i386/isa/loran.c
Poul-Henning Kamp 91266b96c4 Isolate the Timecounter internals in their own two files. 
Make the public interface more systematically named.

Remove the alternate method, it doesn't do any good, only ruins performance.

Add counters to profile the usage of the 8 access functions.

Apply the beer-ware to my code.

The weird +/- counts are caused by two repocopies behind the scenes:
	kern/kern_clock.c -> kern/kern_tc.c
	sys/time.h -> sys/timetc.h
(thanks peter!)
2000-03-20 14:09:06 +00:00

644 lines
16 KiB
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
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
* 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 <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/malloc.h>
#include <sys/timetc.h>
#include <i386/isa/isa_device.h>
#endif /* _KERNEL */
typedef TAILQ_HEAD(, datapoint) dphead_t;
struct datapoint {
/* Fields used by kernel */
u_int64_t scheduled;
u_int code;
u_int fri;
u_int agc;
u_int phase;
u_int width;
u_int par;
u_int isig;
u_int qsig;
u_int ssig;
u_int64_t epoch;
TAILQ_ENTRY(datapoint) list;
int vco;
int bounce;
pid_t pid;
struct timespec when;
int priority;
dphead_t *home;
/* Fields used only in userland */
void (*proc)(struct datapoint *);
void *ident;
int index;
char *name;
/* Fields used only in userland */
double ival;
double qval;
double sval;
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 0x0
#define GATE_GRI 0x4
#define GATE_PCI 0x8
#define GATE_STB 0xc
#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 */
#define VCO_SHIFT 8 /* bits of fraction on VCO value */
#define VCO (2048 << VCO_SHIFT) /* initial vco dac (0 V)*/
#define PGUARD 990 /* program guard time (cycle) (990!) */
#ifdef _KERNEL
#define NLORAN 10 /* Allow ten minor devices */
#define NDUMMY 4 /* How many idlers we want */
#define PORT 0x0300 /* controller port address */
#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) */
#define LOAD_DAC(dac, val) if (0) { } else { \
par &= ~MSB; outb(PAR, par); outb((dac), (val) & 0xff); \
par |= MSB; outb(PAR, par); outb((dac), ((val) >> 8) & 0xff); \
}
/*
* 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 LOAD_9513(index, val) if (0) {} else { \
outb(TGC, TG_LOADDP + (index)); \
outb(TGD, (val) & 0xff); \
outb(TGD, ((val) >> 8) & 0xff); \
}
#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) */
/**********************************************************************/
extern struct cdevsw loran_cdevsw;
static dphead_t minors[NLORAN + 1], working;
static struct datapoint dummy[NDUMMY], *first, *second;
static u_int64_t ticker;
static u_char par;
static MALLOC_DEFINE(M_LORAN, "Loran", "Loran datapoints");
static int loranerror;
static char lorantext[160];
static u_int vco_is;
static u_int vco_should;
static u_int vco_want;
static u_int64_t vco_when;
static int64_t vco_error;
/**********************************************************************/
static int loranprobe (struct isa_device *dvp);
static void init_tgc (void);
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;
static ointhand2_t loranintr;
extern struct timecounter loran_timecounter;
/**********************************************************************/
int
loranprobe(struct isa_device *dvp)
{
static int once;
if (!once++)
cdevsw_add(&loran_cdevsw);
dvp->id_iobase = PORT;
return (8);
}
static u_short tg_init[] = { /* stc initialization vector */
0x0562, 12, 13, /* counter 1 (p0) Mode J */
0x0262, PGUARD, GRI, /* counter 2 (gri) Mode J */
0x8562, PCX, 5000 - PCX, /* counter 3 (pcx) */
0xc562, 0, STROBE, /* counter 4 (stb) Mode L */
0x052a, 0, 0 /* counter 5 (out) */
};
static void
init_tgc(void)
{
int i;
/* Initialize the 9513A */
outb(TGC, TG_RESET); outb(TGC, LOAD+0x1f); /* reset STC chip */
LOAD_9513(MASTER, 0x8af0);
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 */
}
int
loranattach(struct isa_device *isdp)
{
int i;
isdp->id_ointr = loranintr;
/* We need to be a "fast-intr" */
/* isdp->id_ri_flags |= RI_FAST; XXX unimplemented - use newbus! */
printf("loran0: LORAN-C Receiver\n");
vco_want = vco_should = VCO;
vco_is = vco_should >> VCO_SHIFT;
LOAD_DAC(DACA, vco_is);
init_tgc();
tc_init(&loran_timecounter);
TAILQ_INIT(&working);
for (i = 0; i < NLORAN + 1; i++) {
TAILQ_INIT(&minors[i]);
}
for (i = 0; i < NDUMMY; i++) {
dummy[i].agc = 4095;
dummy[i].code = 0xac;
dummy[i].fri = PGUARD;
dummy[i].scheduled = PGUARD * 2 * i;
dummy[i].phase = 50;
dummy[i].width = 50;
dummy[i].priority = NLORAN * 256;
dummy[i].home = &minors[NLORAN];
if (i == 0)
first = &dummy[i];
else if (i == 1)
second = &dummy[i];
else
TAILQ_INSERT_TAIL(&working, &dummy[i], list);
}
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)
{
int idx;
idx = minor(dev);
if (idx >= NLORAN)
return (ENODEV);
return(0);
}
static int
loranclose(dev_t dev, int flags, int fmt, struct proc *p)
{
return(0);
}
static int
loranread(dev_t dev, struct uio * uio, int ioflag)
{
u_long ef;
struct datapoint *this;
int err, c;
int idx;
idx = minor(dev);
if (loranerror) {
printf("Loran0: %s", lorantext);
loranerror = 0;
return(EIO);
}
if (TAILQ_EMPTY(&minors[idx]))
tsleep ((caddr_t)&minors[idx], (PZERO + 8) |PCATCH, "loranrd", hz*2);
if (TAILQ_EMPTY(&minors[idx]))
return(0);
this = TAILQ_FIRST(&minors[idx]);
ef = read_eflags();
disable_intr();
TAILQ_REMOVE(&minors[idx], 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 *dp)
{
struct datapoint *dpp;
TAILQ_FOREACH(dpp, &working, list) {
if (dpp->priority <= dp->priority)
continue;
TAILQ_INSERT_BEFORE(dpp, dp, list);
return;
}
TAILQ_INSERT_TAIL(&working, dp, list);
}
static int
loranwrite(dev_t dev, struct uio * uio, int ioflag)
{
u_long ef;
int err = 0, c;
struct datapoint *this;
int idx;
u_int64_t dt;
u_int64_t when;
idx = minor(dev);
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) {
FREE(this, M_LORAN);
return (err);
}
if (this->fri == 0) {
FREE(this, M_LORAN);
return (EINVAL);
}
this->par &= INTEG|GATE;
/* XXX more checks needed! */
this->home = &minors[idx];
this->priority &= 0xff;
this->priority += idx * 256;
this->bounce = 0;
when = second->scheduled + PGUARD;
if (when > this->scheduled) {
dt = when - this->scheduled;
dt -= dt % this->fri;
this->scheduled += dt;
}
ef = read_eflags();
disable_intr();
loranenqueue(this);
write_eflags(ef);
if (this->vco >= 0)
vco_want = this->vco;
return(err);
}
static void
loranintr(int unit)
{
u_long ef;
int status = 0, i;
#if 0
int count = 0;
#endif
int delay;
u_int64_t when;
struct timespec there, then;
struct datapoint *dp, *done;
ef = read_eflags();
disable_intr();
/*
* Pick up the measurement which just completed, and setup
* the next measurement. We have 1100 microseconds for this
* of which some eaten by the A/D of the S channel and the
* interrupt to get us here.
*/
done = first;
nanotime(&there);
done->ssig = inb(ADC);
par &= ~(ENG | IEN);
outb(PAR, par);
outb(ADC, ADC_I);
outb(ADCGO, ADC_START);
/* Interlude: while we wait: setup the next measurement */
LOAD_DAC(DACB, second->agc);
outb(CODE, second->code);
par &= ~(INTEG|GATE);
par |= second->par;
par |= ENG | IEN;
while (!(inb(ADCGO) & ADC_DONE))
continue;
done->isig = inb(ADC);
outb(ADC, ADC_Q);
outb(ADCGO, ADC_START);
/* Interlude: while we wait: setup the next measurement */
/*
* We need to load this from the opposite register due to some
* weirdness which you can read about in in the 9513 manual on
* page 1-26 under "LOAD"
*/
LOAD_9513(0x0c, second->phase);
LOAD_9513(0x14, second->phase);
outb(TGC, TG_LOADARM + 0x08);
LOAD_9513(0x14, second->width);
while (!(inb(ADCGO) & ADC_DONE))
continue;
done->qsig = inb(ADC);
outb(ADC, ADC_S);
outb(PAR, par);
/*
* End of VERY time critical stuff, we have 8 msec to find
* the next measurement and program the delay.
*/
status = inb(TGC);
nanotime(&then);
first = second;
second = 0;
when = first->scheduled + PGUARD;
TAILQ_FOREACH(dp, &working, list) {
while (dp->scheduled < when)
dp->scheduled += dp->fri;
if (second && dp->scheduled + PGUARD >= second->scheduled)
continue;
second = dp;
}
delay = (second->scheduled - first->scheduled) - GRI;
LOAD_9513(0x0a, delay);
/* Done, the rest is leisure work */
vco_error += ((vco_is << VCO_SHIFT) - vco_should) *
(ticker - vco_when);
vco_should = vco_want;
i = vco_should >> VCO_SHIFT;
if (vco_error < 0)
i++;
if (vco_is != i) {
LOAD_DAC(DACA, i);
vco_is = i;
}
vco_when = ticker;
/* Check if we overran */
status &= 0x0c;
#if 0
if (status) {
outb(TGC, TG_SAVE + 2); /* save counter #2 */
outb(TGC, TG_LOADDP + 0x12); /* hold counter #2 */
count = inb(TGD);
count |= inb(TGD) << 8;
LOAD_9513(0x12, GRI)
}
#endif
if (status) {
printf( "Missed: %02x %d first:%p second:%p %.09ld\n",
status, delay, first, second,
then.tv_nsec - there.tv_nsec);
first->bounce++;
}
TAILQ_REMOVE(&working, second, list);
if (done->bounce) {
done->bounce = 0;
loranenqueue(done);
} else {
done->epoch = ticker;
done->vco = vco_is;
done->when = there;
TAILQ_INSERT_TAIL(done->home, done, list);
wakeup((caddr_t)done->home);
}
ticker = first->scheduled;
while ((dp = TAILQ_FIRST(&minors[NLORAN])) != NULL) {
TAILQ_REMOVE(&minors[NLORAN], dp, list);
TAILQ_INSERT_TAIL(&working, dp, list);
}
when = second->scheduled + PGUARD;
TAILQ_FOREACH(dp, &working, list) {
while (dp->scheduled < when)
dp->scheduled += dp->fri;
}
write_eflags(ef);
}
/**********************************************************************/
static unsigned
loran_get_timecount(struct timecounter *tc)
{
unsigned count;
u_long ef;
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 = {
loran_get_timecount, /* get_timecount */
0, /* no pps_poll */
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 = {
/* open */ loranopen,
/* close */ loranclose,
/* read */ loranread,
/* write */ loranwrite,
/* ioctl */ noioctl,
/* poll */ nopoll,
/* mmap */ nommap,
/* strategy */ nostrategy,
/* name */ "loran",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
/* bmaj */ -1
};
#endif /* _KERNEL */
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