xref: /src/sys/arch/sun2/dev/sc_mbmem.c

/*	$NetBSD: sc_mbmem.c,v 1.16 2023/08/04 11:18:18 rin Exp $	*/

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Adam Glass, David Jones, Gordon W. Ross, and Matthew Fredette.
 *
 * 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.
 */

/*
 * This file contains only the machine-dependent parts of the
 * Sun-2 SCSI driver.  (Autoconfig stuff and DMA functions.)
 * The machine-independent parts are in sunscpal.c
 *
 * Supported hardware includes:
 * Sun SCSI-2 on Multibus (Sun2/120,Sun2/170)
 * Sun SCSI-2 on VME (Sun2/50,Sun3/160,Sun3/260,others?)
 *
 * Credits, history:
 *
 * Matthew Fredette took revision 1.15 of si_vme.c, and then heavily
 * modified it to support the Sun sc.  The remaining credits
 * are from si_vme.c:
 *
 * David Jones wrote the initial version of this module, which
 * included support for the VME adapter only. (no reselection).
 *
 * Gordon Ross added support for the OBIO adapter, and re-worked
 * both the VME and OBIO code to support disconnect/reselect.
 * (Required figuring out the hardware "features" noted above.)
 *
 * The autoconfiguration boilerplate came from Adam Glass.
 */

/*****************************************************************
 * Multibus functions for sc
 ****************************************************************/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sc_mbmem.c,v 1.16 2023/08/04 11:18:18 rin Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/kmem.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/proc.h>

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

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

/* #define DEBUG XXX */

#include <dev/ic/sunscpalreg.h>
#include <dev/ic/sunscpalvar.h>

/* Yes, we use a VME header file. */
#include <dev/vme/screg.h>

/*
 * Transfers smaller than this are done using PIO
 * (on assumption they're not worth DMA overhead)
 */
#define	MIN_DMA_LEN 128

/*
 * New-style autoconfig attachment
 */

static int	sunsc_mbmem_match(device_t, cfdata_t, void *);
static void	sunsc_mbmem_attach(device_t, device_t, void *);
static int	sunsc_mbmem_intr(void *);

CFATTACH_DECL_NEW(sc_mbmem, sizeof(struct sunscpal_softc),
    sunsc_mbmem_match, sunsc_mbmem_attach, NULL, NULL);

/*
 * Options for parity, DMA, and interrupts.
 */
int sunsc_mbmem_options = 0x00;

static int
sunsc_mbmem_match(device_t parent, cfdata_t cf, void *aux)
{
	struct mbmem_attach_args *mbma = aux;
	bus_space_handle_t bh;
	bool matched;

	/* No default Multibus address. */
	if (mbma->mbma_paddr == -1)
		return 0;

	/* Make sure there is something there... */
	if (bus_space_map(mbma->mbma_bustag, mbma->mbma_paddr, SCREG_BANK_SZ,
	    0, &bh))
		return 0;
	matched =
	    (bus_space_peek_2(mbma->mbma_bustag, bh, SCREG_ICR, NULL) == 0);
	bus_space_unmap(mbma->mbma_bustag, bh, SCREG_BANK_SZ);
	if (!matched)
		return 0;

	/* Default interrupt priority. */
	if (mbma->mbma_pri == -1)
		mbma->mbma_pri = 2;

	return 1;
}

static void
sunsc_mbmem_attach(device_t parent, device_t self, void *args)
{
	struct sunscpal_softc *sc = device_private(self);
	struct cfdata *cf = device_cfdata(self);
	struct mbmem_attach_args *mbma = args;
	int i;

	sc->sc_dev = self;

	/* Map in the device. */
	sc->sunscpal_regt = mbma->mbma_bustag;
	sc->sunscpal_dmat = mbma->mbma_dmatag;
	if (bus_space_map(mbma->mbma_bustag, mbma->mbma_paddr, SCREG_BANK_SZ,
	    0, &sc->sunscpal_regh))
		panic("%s: can't map", __func__);

	/* Device register offsets. */
	sc->sunscpal_data = SCREG_DATA;
	sc->sunscpal_cmd_stat = SCREG_CMD_STAT;
	sc->sunscpal_icr = SCREG_ICR;
	sc->sunscpal_dma_addr_h = SCREG_DMA_ADDR_H;
	sc->sunscpal_dma_addr_l = SCREG_DMA_ADDR_L;
	sc->sunscpal_dma_count = SCREG_DMA_COUNT;
	sc->sunscpal_intvec = SCREG_INTVEC;

	/* Allocate DMA handles. */
	i = SUNSCPAL_OPENINGS * sizeof(struct sunscpal_dma_handle);
	sc->sc_dma_handles = kmem_zalloc(i, KM_SLEEP);
	for (i = 0; i < SUNSCPAL_OPENINGS; i++)
		if (bus_dmamap_create(sc->sunscpal_dmat, SUNSCPAL_MAX_DMA_LEN,
		    1, SUNSCPAL_MAX_DMA_LEN,
		    0, BUS_DMA_WAITOK, &sc->sc_dma_handles[i].dh_dmamap) != 0)
			panic("sc: DMA map create failed");

	/* Miscellaneous. */
	sc->sc_min_dma_len = MIN_DMA_LEN;
	sc->sc_rev = SUNSCPAL_VARIANT_501_1006;

	/* Attach interrupt handler. */
	bus_intr_establish(mbma->mbma_bustag, mbma->mbma_pri, IPL_BIO, 0,
	    sunsc_mbmem_intr, sc);

	/* Do the common attach stuff. */
	sunscpal_attach(sc, cf->cf_flags ? cf->cf_flags : sunsc_mbmem_options);
}

static int
sunsc_mbmem_intr(void *arg)
{
	struct sunscpal_softc *sc = arg;
	int claimed;

	claimed = sunscpal_intr(sc);
#ifdef	DEBUG
	if (claimed == 0) {
		printf("%s: spurious from SBC\n", __func__);
	}
#endif
	/* Yes, we DID cause this interrupt. */
	claimed = 1;

	return claimed;
}