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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
* ----------------------------------------------------------------------------
*
* $FreeBSD$
*
* 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 "xrpu.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/timepps.h>
#include <sys/xrpuio.h>
#include <pci/pcireg.h>
#include <pci/pcivar.h>
static const char* xrpu_probe (pcici_t tag, pcidi_t type);
static void xrpu_attach (pcici_t tag, int unit);
static u_long xrpu_count;
static void xrpu_poll_pps(struct timecounter *tc);
/*
* 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");
#define dev2unit(devt) (minor(devt) & 0xff)
#define dev2pps(devt) ((minor(devt) >> 16)-1)
static struct softc {
pcici_t tag;
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];
} *softc[NXRPU];
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);
}
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 = softc[dev2unit(dev)];
if (!sc)
return (ENXIO);
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 = softc[dev2unit(dev)];
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 = softc[dev2unit(dev)];
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;
init_timecounter(&sc->tc);
return (0);
}
error = ENOTTY;
return (error);
}
/*
* PCI initialization stuff
*/
static struct pci_device xrpu_device = {
"xrpu",
xrpu_probe,
xrpu_attach,
&xrpu_count,
NULL
};
COMPAT_PCI_DRIVER (xrpu, xrpu_device);
static const char*
xrpu_probe (pcici_t tag, pcidi_t typea)
{
u_int id;
const char *vendor, *chip, *type;
static int once;
if (!once++)
cdevsw_add(&xrpu_cdevsw);
(void)pci_conf_read(tag, PCI_CLASS_REG);
id = pci_conf_read(tag, PCI_ID_REG);
vendor = chip = type = 0;
if (id == 0x6216133e) {
return "VCC Hotworks-I xc6216";
}
return 0;
}
static void
xrpu_attach (pcici_t tag, int unit)
{
struct softc *sc;
sc = (struct softc *)malloc(sizeof *sc, M_XRPU, M_WAITOK);
softc[unit] = sc;
bzero(sc, sizeof *sc);
sc->tag = tag;
sc->mode = NORMAL;
pci_map_mem(tag, PCI_MAP_REG_START, &sc->virbase, &sc->physbase);
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);
}
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