1
0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-17 10:26:15 +00:00
freebsd/sys/pci/xrpu.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

269 lines
6.4 KiB
C

/*
* ----------------------------------------------------------------------------
* "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
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
* A very simple device driver for PCI cards based on Xilinx 6200 series
* FPGA/RPU devices. Current Functionality is to allow you to open and
* mmap the entire thing into your program.
*
* Hardware currently supported:
* www.vcc.com HotWorks 1 6216 based card.
*
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/timetc.h>
#include <sys/timepps.h>
#include <sys/xrpuio.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <pci/pcireg.h>
#include <pci/pcivar.h>
#include "pci_if.h"
/*
* Device driver initialization stuff
*/
static d_open_t xrpu_open;
static d_close_t xrpu_close;
static d_ioctl_t xrpu_ioctl;
static d_mmap_t xrpu_mmap;
#define CDEV_MAJOR 100
static struct cdevsw xrpu_cdevsw = {
/* open */ xrpu_open,
/* close */ xrpu_close,
/* read */ noread,
/* write */ nowrite,
/* ioctl */ xrpu_ioctl,
/* poll */ nopoll,
/* mmap */ xrpu_mmap,
/* strategy */ nostrategy,
/* name */ "xrpu",
/* maj */ CDEV_MAJOR,
/* dump */ nodump,
/* psize */ nopsize,
/* flags */ 0,
/* bmaj */ -1
};
static MALLOC_DEFINE(M_XRPU, "xrpu", "XRPU related");
static devclass_t xrpu_devclass;
#define dev2unit(devt) (minor(devt) & 0xff)
#define dev2pps(devt) ((minor(devt) >> 16)-1)
struct softc {
enum { NORMAL, TIMECOUNTER } mode;
vm_offset_t virbase, physbase;
u_int *virbase62;
struct timecounter tc;
u_int *trigger, *latch, dummy;
struct pps_state pps[XRPU_MAX_PPS];
u_int *assert[XRPU_MAX_PPS], *clear[XRPU_MAX_PPS];
};
static unsigned
xrpu_get_timecount(struct timecounter *tc)
{
struct softc *sc = tc->tc_priv;
sc->dummy += *sc->trigger;
return (*sc->latch & tc->tc_counter_mask);
}
static void
xrpu_poll_pps(struct timecounter *tc)
{
struct softc *sc = tc->tc_priv;
int i, j;
unsigned count1, ppscount;
for (i = 0; i < XRPU_MAX_PPS; i++) {
if (sc->assert[i]) {
ppscount = *(sc->assert[i]) & tc->tc_counter_mask;
j = 0;
do {
count1 = ppscount;
ppscount = *(sc->assert[i]) & tc->tc_counter_mask;
} while (ppscount != count1 && ++j < 5);
pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTUREASSERT);
}
if (sc->clear[i]) {
j = 0;
ppscount = *(sc->clear[i]) & tc->tc_counter_mask;
do {
count1 = ppscount;
ppscount = *(sc->clear[i]) & tc->tc_counter_mask;
} while (ppscount != count1 && ++j < 5);
pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTURECLEAR);
}
}
}
static int
xrpu_open(dev_t dev, int flag, int mode, struct proc *p)
{
struct softc *sc = devclass_get_softc(xrpu_devclass, dev2unit(dev));
if (!sc)
return (ENXIO);
dev->si_drv1 = sc;
return (0);
}
static int
xrpu_close(dev_t dev, int flag, int mode, struct proc *p)
{
return (0);
}
static int
xrpu_mmap(dev_t dev, vm_offset_t offset, int nprot)
{
struct softc *sc = dev->si_drv1;
if (offset >= 0x1000000)
return (-1);
return (i386_btop(sc->physbase + offset));
}
static int
xrpu_ioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct proc *pr)
{
struct softc *sc = dev->si_drv1;
int i, error;
if (sc->mode == TIMECOUNTER) {
i = dev2pps(dev);
if (i < 0 || i >= XRPU_MAX_PPS)
return ENODEV;
error = pps_ioctl(cmd, arg, &sc->pps[i]);
return (error);
}
if (cmd == XRPU_IOC_TIMECOUNTING) {
struct xrpu_timecounting *xt = (struct xrpu_timecounting *)arg;
/* Name SHALL be zero terminated */
xt->xt_name[sizeof xt->xt_name - 1] = '\0';
i = strlen(xt->xt_name);
sc->tc.tc_name = (char *)malloc(i + 1, M_XRPU, M_WAITOK);
strcpy(sc->tc.tc_name, xt->xt_name);
sc->tc.tc_frequency = xt->xt_frequency;
sc->tc.tc_get_timecount = xrpu_get_timecount;
sc->tc.tc_poll_pps = xrpu_poll_pps;
sc->tc.tc_priv = sc;
sc->tc.tc_counter_mask = xt->xt_mask;
sc->trigger = sc->virbase62 + xt->xt_addr_trigger;
sc->latch = sc->virbase62 + xt->xt_addr_latch;
for (i = 0; i < XRPU_MAX_PPS; i++) {
if (xt->xt_pps[i].xt_addr_assert == 0
&& xt->xt_pps[i].xt_addr_clear == 0)
continue;
make_dev(&xrpu_cdevsw, (i+1)<<16,
UID_ROOT, GID_WHEEL, 0600, "xpps%d", i);
sc->pps[i].ppscap = 0;
if (xt->xt_pps[i].xt_addr_assert) {
sc->assert[i] = sc->virbase62 + xt->xt_pps[i].xt_addr_assert;
sc->pps[i].ppscap |= PPS_CAPTUREASSERT;
}
if (xt->xt_pps[i].xt_addr_clear) {
sc->clear[i] = sc->virbase62 + xt->xt_pps[i].xt_addr_clear;
sc->pps[i].ppscap |= PPS_CAPTURECLEAR;
}
pps_init(&sc->pps[i]);
}
sc->mode = TIMECOUNTER;
tc_init(&sc->tc);
return (0);
}
error = ENOTTY;
return (error);
}
/*
* PCI initialization stuff
*/
static int
xrpu_probe(device_t self)
{
char *desc;
desc = NULL;
switch (pci_get_devid(self)) {
case 0x6216133e:
desc = "VCC Hotworks-I xc6216";
break;
}
if (desc == NULL)
return ENXIO;
device_set_desc(self, desc);
return 0;
}
static int
xrpu_attach(device_t self)
{
struct softc *sc;
struct resource *res;
int rid, unit;
unit = device_get_unit(self);
sc = device_get_softc(self);
sc->mode = NORMAL;
rid = PCI_MAP_REG_START;
res = bus_alloc_resource(self, SYS_RES_MEMORY, &rid,
0, ~0, 1, RF_ACTIVE);
if (res == NULL) {
device_printf(self, "Could not map memory\n");
return ENXIO;
}
sc->virbase = (vm_offset_t)rman_get_virtual(res);
sc->physbase = rman_get_start(res);
sc->virbase62 = (u_int *)(sc->virbase + 0x800000);
if (bootverbose)
printf("Mapped physbase %#lx to virbase %#lx\n",
(u_long)sc->physbase, (u_long)sc->virbase);
make_dev(&xrpu_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "xrpu%d", unit);
return 0;
}
static device_method_t xrpu_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, xrpu_probe),
DEVMETHOD(device_attach, xrpu_attach),
DEVMETHOD(device_suspend, bus_generic_suspend),
DEVMETHOD(device_resume, bus_generic_resume),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
{0, 0}
};
static driver_t xrpu_driver = {
"xrpu",
xrpu_methods,
sizeof(struct softc)
};
DRIVER_MODULE(xrpu, pci, xrpu_driver, xrpu_devclass, 0, 0);