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268 lines
6.4 KiB
C
268 lines
6.4 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $FreeBSD$
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*
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* A very simple device driver for PCI cards based on Xilinx 6200 series
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* FPGA/RPU devices. Current Functionality is to allow you to open and
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* mmap the entire thing into your program.
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*
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* Hardware currently supported:
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* www.vcc.com HotWorks 1 6216 based card.
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*
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/timetc.h>
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#include <sys/timepps.h>
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#include <sys/xrpuio.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <pci/pcireg.h>
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#include <pci/pcivar.h>
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#include "pci_if.h"
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/*
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* Device driver initialization stuff
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*/
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static d_open_t xrpu_open;
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static d_close_t xrpu_close;
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static d_ioctl_t xrpu_ioctl;
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static d_mmap_t xrpu_mmap;
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#define CDEV_MAJOR 100
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static struct cdevsw xrpu_cdevsw = {
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/* open */ xrpu_open,
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/* close */ xrpu_close,
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/* read */ noread,
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/* write */ nowrite,
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/* ioctl */ xrpu_ioctl,
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/* poll */ nopoll,
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/* mmap */ xrpu_mmap,
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/* strategy */ nostrategy,
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/* name */ "xrpu",
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/* maj */ CDEV_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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};
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static MALLOC_DEFINE(M_XRPU, "xrpu", "XRPU related");
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static devclass_t xrpu_devclass;
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#define dev2unit(devt) (minor(devt) & 0xff)
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#define dev2pps(devt) ((minor(devt) >> 16)-1)
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struct softc {
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enum { NORMAL, TIMECOUNTER } mode;
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vm_offset_t virbase, physbase;
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u_int *virbase62;
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struct timecounter tc;
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u_int *trigger, *latch, dummy;
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struct pps_state pps[XRPU_MAX_PPS];
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u_int *assert[XRPU_MAX_PPS], *clear[XRPU_MAX_PPS];
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};
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static unsigned
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xrpu_get_timecount(struct timecounter *tc)
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{
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struct softc *sc = tc->tc_priv;
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sc->dummy += *sc->trigger;
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return (*sc->latch & tc->tc_counter_mask);
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}
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static void
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xrpu_poll_pps(struct timecounter *tc)
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{
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struct softc *sc = tc->tc_priv;
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int i, j;
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unsigned count1, ppscount;
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for (i = 0; i < XRPU_MAX_PPS; i++) {
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if (sc->assert[i]) {
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ppscount = *(sc->assert[i]) & tc->tc_counter_mask;
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j = 0;
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do {
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count1 = ppscount;
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ppscount = *(sc->assert[i]) & tc->tc_counter_mask;
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} while (ppscount != count1 && ++j < 5);
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pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTUREASSERT);
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}
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if (sc->clear[i]) {
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j = 0;
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ppscount = *(sc->clear[i]) & tc->tc_counter_mask;
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do {
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count1 = ppscount;
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ppscount = *(sc->clear[i]) & tc->tc_counter_mask;
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} while (ppscount != count1 && ++j < 5);
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pps_event(&sc->pps[i], tc, ppscount, PPS_CAPTURECLEAR);
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}
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}
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}
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static int
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xrpu_open(dev_t dev, int flag, int mode, struct proc *p)
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{
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struct softc *sc = devclass_get_softc(xrpu_devclass, dev2unit(dev));
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if (!sc)
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return (ENXIO);
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dev->si_drv1 = sc;
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return (0);
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}
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static int
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xrpu_close(dev_t dev, int flag, int mode, struct proc *p)
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{
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return (0);
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}
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static int
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xrpu_mmap(dev_t dev, vm_offset_t offset, int nprot)
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{
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struct softc *sc = dev->si_drv1;
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if (offset >= 0x1000000)
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return (-1);
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return (i386_btop(sc->physbase + offset));
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}
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static int
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xrpu_ioctl(dev_t dev, u_long cmd, caddr_t arg, int flag, struct proc *pr)
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{
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struct softc *sc = dev->si_drv1;
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int i, error;
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if (sc->mode == TIMECOUNTER) {
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i = dev2pps(dev);
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if (i < 0 || i >= XRPU_MAX_PPS)
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return ENODEV;
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error = pps_ioctl(cmd, arg, &sc->pps[i]);
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return (error);
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}
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if (cmd == XRPU_IOC_TIMECOUNTING) {
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struct xrpu_timecounting *xt = (struct xrpu_timecounting *)arg;
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/* Name SHALL be zero terminated */
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xt->xt_name[sizeof xt->xt_name - 1] = '\0';
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i = strlen(xt->xt_name);
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sc->tc.tc_name = (char *)malloc(i + 1, M_XRPU, M_WAITOK);
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strcpy(sc->tc.tc_name, xt->xt_name);
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sc->tc.tc_frequency = xt->xt_frequency;
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sc->tc.tc_get_timecount = xrpu_get_timecount;
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sc->tc.tc_poll_pps = xrpu_poll_pps;
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sc->tc.tc_priv = sc;
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sc->tc.tc_counter_mask = xt->xt_mask;
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sc->trigger = sc->virbase62 + xt->xt_addr_trigger;
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sc->latch = sc->virbase62 + xt->xt_addr_latch;
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for (i = 0; i < XRPU_MAX_PPS; i++) {
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if (xt->xt_pps[i].xt_addr_assert == 0
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&& xt->xt_pps[i].xt_addr_clear == 0)
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continue;
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make_dev(&xrpu_cdevsw, (i+1)<<16,
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UID_ROOT, GID_WHEEL, 0600, "xpps%d", i);
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sc->pps[i].ppscap = 0;
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if (xt->xt_pps[i].xt_addr_assert) {
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sc->assert[i] = sc->virbase62 + xt->xt_pps[i].xt_addr_assert;
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sc->pps[i].ppscap |= PPS_CAPTUREASSERT;
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}
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if (xt->xt_pps[i].xt_addr_clear) {
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sc->clear[i] = sc->virbase62 + xt->xt_pps[i].xt_addr_clear;
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sc->pps[i].ppscap |= PPS_CAPTURECLEAR;
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}
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pps_init(&sc->pps[i]);
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}
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sc->mode = TIMECOUNTER;
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tc_init(&sc->tc);
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return (0);
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}
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error = ENOTTY;
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return (error);
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}
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/*
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* PCI initialization stuff
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*/
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static int
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xrpu_probe(device_t self)
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{
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char *desc;
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desc = NULL;
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switch (pci_get_devid(self)) {
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case 0x6216133e:
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desc = "VCC Hotworks-I xc6216";
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break;
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}
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if (desc == NULL)
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return ENXIO;
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device_set_desc(self, desc);
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return 0;
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}
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static int
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xrpu_attach(device_t self)
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{
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struct softc *sc;
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struct resource *res;
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int rid, unit;
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unit = device_get_unit(self);
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sc = device_get_softc(self);
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sc->mode = NORMAL;
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rid = PCIR_MAPS;
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res = bus_alloc_resource(self, SYS_RES_MEMORY, &rid,
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0, ~0, 1, RF_ACTIVE);
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if (res == NULL) {
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device_printf(self, "Could not map memory\n");
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return ENXIO;
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}
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sc->virbase = (vm_offset_t)rman_get_virtual(res);
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sc->physbase = rman_get_start(res);
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sc->virbase62 = (u_int *)(sc->virbase + 0x800000);
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if (bootverbose)
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printf("Mapped physbase %#lx to virbase %#lx\n",
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(u_long)sc->physbase, (u_long)sc->virbase);
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make_dev(&xrpu_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "xrpu%d", unit);
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return 0;
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}
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static device_method_t xrpu_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, xrpu_probe),
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DEVMETHOD(device_attach, xrpu_attach),
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DEVMETHOD(device_suspend, bus_generic_suspend),
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DEVMETHOD(device_resume, bus_generic_resume),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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{0, 0}
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};
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static driver_t xrpu_driver = {
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"xrpu",
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xrpu_methods,
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sizeof(struct softc)
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};
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DRIVER_MODULE(xrpu, pci, xrpu_driver, xrpu_devclass, 0, 0);
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