NetBSD/sys/dev/mvme/osiop_pcctwo.c

/*	$NetBSD: osiop_pcctwo.c,v 1.14 2009/03/23 18:59:57 scw Exp $	*/

/*-
 * Copyright (c) 1999, 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Steve C. Woodford.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Front-end attachment code for the ncr53c710 SCSI controller
 * on mvme68k/mvme88k boards.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: osiop_pcctwo.c,v 1.14 2009/03/23 18:59:57 scw Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>

#include <dev/scsipi/scsi_all.h>
#include <dev/scsipi/scsipi_all.h>
#include <dev/scsipi/scsiconf.h>

#include <sys/cpu.h>
#include <sys/bus.h>
#include <machine/autoconf.h>

#include <dev/ic/osiopreg.h>
#include <dev/ic/osiopvar.h>

#include <dev/mvme/pcctworeg.h>
#include <dev/mvme/pcctwovar.h>

#include "ioconf.h"

int osiop_pcctwo_match(device_t, cfdata_t, void *);
void osiop_pcctwo_attach(device_t, device_t, void *);

struct osiop_pcctwo_softc {
	struct osiop_softc	sc_osiop;
	struct evcnt		sc_evcnt;
};

CFATTACH_DECL_NEW(osiop_pcctwo, sizeof(struct osiop_pcctwo_softc),
    osiop_pcctwo_match, osiop_pcctwo_attach, NULL, NULL);

static int osiop_pcctwo_intr(void *);

/* ARGSUSED */
int
osiop_pcctwo_match(device_t parent, cfdata_t cf, void *args)
{
	struct pcctwo_attach_args *pa;
	bus_space_handle_t bsh;
	int rv;

	pa = args;

	if (strcmp(pa->pa_name, osiop_cd.cd_name))
		return (0);

	/*
	 * See if the SCSI controller is responding.
	 */
	if (bus_space_map(pa->pa_bust, pa->pa_offset, OSIOP_NREGS, 0, &bsh))
		return (0);
	rv = bus_space_peek_1(pa->pa_bust, bsh, OSIOP_CTEST8, NULL);
	bus_space_unmap(pa->pa_bust, bsh, OSIOP_NREGS);
	if (rv)
		return (0);

	pa->pa_ipl = cf->pcctwocf_ipl;

	return (1);
}

/* ARGSUSED */
void
osiop_pcctwo_attach(device_t parent, device_t self, void *aux)
{
	struct pcctwo_attach_args *pa;
	struct osiop_pcctwo_softc *sc;
	int clk, ctest7;

	sc = device_private(self);
	pa = aux;

	/*
	 * On the '17x the siop's clock is the same as the CPU clock.
	 * On the other boards, the siop runs at twice the CPU clock.
	 * Also, the 17x cannot do proper bus-snooping (the 68060 is
	 * lame in this repspect) so don't enable it on that board.
	 */
#ifdef MVME68K
	if (machineid == MVME_172 || machineid == MVME_177) {
		clk = cpuspeed;
		ctest7 = 0;
	} else {
		clk = cpuspeed * 2;
		ctest7 = OSIOP_CTEST7_SC0;
	}
#else
#error Set up siop clock speed for mvme187
#endif

	sc->sc_osiop.sc_dev = self;
	sc->sc_osiop.sc_bst = pa->pa_bust;
	sc->sc_osiop.sc_dmat = pa->pa_dmat;
	(void) bus_space_map(sc->sc_osiop.sc_bst, pa->pa_offset, OSIOP_NREGS,
	    0, &sc->sc_osiop.sc_reg);

	sc->sc_osiop.sc_clock_freq = clk;
	sc->sc_osiop.sc_ctest7 = ctest7 | OSIOP_CTEST7_TT1;
	sc->sc_osiop.sc_dcntl = OSIOP_DCNTL_EA;
	sc->sc_osiop.sc_id = 7;	/* XXX: Could use NVRAM setting */

	/* Attach main MI driver */
	osiop_attach(&sc->sc_osiop);

	/* Register the event counter */
	evcnt_attach_dynamic(&sc->sc_evcnt, EVCNT_TYPE_INTR,
	    pcctwointr_evcnt(pa->pa_ipl), "disk",
	    device_xname(sc->sc_osiop.sc_dev));

	/* Hook the chip's interrupt */
	pcctwointr_establish(PCCTWOV_SCSI, osiop_pcctwo_intr, pa->pa_ipl, sc,
	    &sc->sc_evcnt);
}

static int
osiop_pcctwo_intr(void *arg)
{
	struct osiop_pcctwo_softc *sc = arg;
	u_char istat;

	/*
	 * Catch any errors which can happen when the SIOP is
	 * local bus master...
	 */
	istat = pcc2_reg_read(sys_pcctwo, PCC2REG_SCSI_ERR_STATUS);
	if ((istat & PCCTWO_ERR_SR_MASK) != 0) {
		printf("%s: Local bus error: 0x%02x\n",
		    device_xname(sc->sc_osiop.sc_dev), istat);
		istat |= PCCTWO_ERR_SR_SCLR;
		pcc2_reg_write(sys_pcctwo, PCC2REG_SCSI_ERR_STATUS, istat);
	}

	/* This is potentially nasty, since the IRQ is level triggered... */
	if (sc->sc_osiop.sc_flags & OSIOP_INTSOFF)
		return (0);

	istat = osiop_read_1(&sc->sc_osiop, OSIOP_ISTAT);

	if ((istat & (OSIOP_ISTAT_SIP | OSIOP_ISTAT_DIP)) == 0)
		return (0);

	/* Save interrupt details for the back-end interrupt handler */
	sc->sc_osiop.sc_sstat0 = osiop_read_1(&sc->sc_osiop, OSIOP_SSTAT0);
	sc->sc_osiop.sc_istat = istat;
	sc->sc_osiop.sc_dstat = osiop_read_1(&sc->sc_osiop, OSIOP_DSTAT);

	/* Deal with the interrupt */
	osiop_intr(&sc->sc_osiop);

	return (1);
}