/*	$NetBSD: wdsc.c,v 1.10 2002/10/02 04:09:16 thorpej Exp $	*/

/*
 * Copyright (c) 2001 Wayne Knowles
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Wayne Knowles
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * 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.
 */

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

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

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

#include <sgimips/hpc/hpcvar.h>
#include <sgimips/hpc/hpcreg.h>
#include <sgimips/hpc/hpcdma.h>

#include <sgimips/hpc/sbicreg.h>
#include <sgimips/hpc/sbicvar.h>

#include <opt_kgdb.h>
#include <sys/kgdb.h>

struct wdsc_softc {
	struct wd33c93_softc	sc_wd33c93; /* Must be first */
	struct evcnt		sc_intrcnt; /* Interrupt counter */
	bus_dma_tag_t		sc_dmat;
	bus_dmamap_t		sc_dmamap;
	int			sc_flags;
#define	WDSC_DMA_ACTIVE			0x1
#define	WDSC_DMA_MAPLOADED		0x2
	struct hpc_dma_softc	sc_hpcdma;
};


void	wdsc_attach	__P((struct device *, struct device *, void *));
int	wdsc_match	__P((struct device *, struct cfdata *, void *));

CFATTACH_DECL(wdsc, sizeof(struct wdsc_softc),
    wdsc_match, wdsc_attach, NULL, NULL);

int	wdsc_dmasetup	__P((struct wd33c93_softc *, caddr_t *,size_t *,
				int, size_t *));
int	wdsc_dmago	__P((struct wd33c93_softc *));
void	wdsc_dmastop	__P((struct wd33c93_softc *));
void	wdsc_reset	__P((struct wd33c93_softc *));
int	wdsc_dmaintr	__P((void *));
int	wdsc_scsiintr	__P((void *));

#define MAX_SCSI_XFER	(512*1024)
#define MAX_SEG_SZ	8192
#define	MAX_DMA_SZ	MAX_SCSI_XFER
#define	DMA_SEGS	(MAX_DMA_SZ/MAX_SEG_SZ)

/*
 * Match for SCSI devices on the onboard WD33C93 chip
 */
int
wdsc_match(pdp, cf, auxp)
	struct device *pdp;
	struct cfdata *cf;
	void *auxp;
{
	struct hpc_attach_args *haa = auxp;

	if (strcmp(haa->ha_name, cf->cf_name) == 0)
		return (1);

	return (0);
}

/*
 * Attach the wdsc driver
 */
void
wdsc_attach(pdp, dp, auxp)
	struct device *pdp, *dp;
	void *auxp;
{
	struct wd33c93_softc *sc = (void *)dp;
	struct wdsc_softc *wsc = (void *)dp;
	struct hpc_attach_args *haa = auxp;
	int err;

	sc->sc_regt = haa->ha_st;
	wsc->sc_dmat = haa->ha_dmat;

	if ((err = bus_space_subregion(haa->ha_st, haa->ha_sh,
					haa->ha_devoff,
					HPC_SCSI0_DEVREGS_SIZE,
					&sc->sc_regh)) != 0) {
		printf(": unable to map regs, err=%d\n", err);
		return;
	}

	if (bus_dmamap_create(wsc->sc_dmat, MAX_DMA_SZ,
			      DMA_SEGS, MAX_SEG_SZ, MAX_SEG_SZ,
			      BUS_DMA_WAITOK,
			      &wsc->sc_dmamap) != 0) {
		printf(": failed to create dmamap\n");
		return;
	}

	sc->sc_dmasetup = wdsc_dmasetup;
	sc->sc_dmago    = wdsc_dmago;
	sc->sc_dmastop  = wdsc_dmastop;
	sc->sc_reset	= wdsc_reset;

	sc->sc_adapter.adapt_request = wd33c93_scsi_request;
	sc->sc_adapter.adapt_minphys = minphys;

	sc->sc_id = 7;			/* Host ID = 7 */
	sc->sc_clkfreq = 200;		/* 20MHz Clock */

	evcnt_attach_dynamic(&wsc->sc_intrcnt, EVCNT_TYPE_INTR, NULL,
			     sc->sc_dev.dv_xname, "intr");

	if ((cpu_intr_establish(haa->ha_irq, IPL_BIO,
	     wdsc_scsiintr, sc)) == NULL) {
		printf(": unable to establish interrupt!\n");
		return;
	}

	hpcdma_init(haa, &wsc->sc_hpcdma, DMA_SEGS);
	wd33c93_attach(sc);
	return;
}

/*
 * Prime the hardware for a DMA transfer
 *
 * Requires splbio() interrupts to be disabled by the caller
 */
int
wdsc_dmasetup(dev, addr, len, datain, dmasize)
	struct wd33c93_softc *dev;
	caddr_t *addr;
	size_t *len;
	int datain;
	size_t *dmasize;
{
	struct wdsc_softc *wsc = (void *)dev;
	struct hpc_dma_softc *dsc = &wsc->sc_hpcdma;
	int count, err;
	void *vaddr;

	KASSERT((wsc->sc_flags & WDSC_DMA_ACTIVE) == 0);

	vaddr = *addr;
	count = dsc->sc_dlen = *len;
	if (count) {
		KASSERT((wsc->sc_flags & WDSC_DMA_MAPLOADED) == 0);

		/* Build list of physical addresses for this transfer */
		if ((err=bus_dmamap_load(wsc->sc_dmat, wsc->sc_dmamap,
				vaddr, count,
				NULL /* kernel address */,
				BUS_DMA_NOWAIT)) != 0)
			panic("%s: bus_dmamap_load err=%d",
			      dev->sc_dev.dv_xname, err);

		hpcdma_sglist_create(dsc, wsc->sc_dmamap);
		wsc->sc_flags |= WDSC_DMA_MAPLOADED;

		if (datain) {
			dsc->sc_dmacmd = HPC_DMACTL_ACTIVE;
			dsc->sc_flags |= HPCDMA_READ;
		} else {
			dsc->sc_dmacmd = HPC_DMACTL_ACTIVE | HPC_DMACTL_DIR;
			dsc->sc_flags &= ~HPCDMA_READ;
		}
	}
	return(count);
}

/*
 * Prime the hardware for the next DMA transfer
 */
int
wdsc_dmago(dev)
	struct wd33c93_softc *dev;
{
	struct wdsc_softc *wsc = (void *)dev;
	struct hpc_dma_softc *dsc = &wsc->sc_hpcdma;

	if (dsc->sc_dlen == 0)
		return(0);

	KASSERT((wsc->sc_flags & WDSC_DMA_ACTIVE) == 0);
	KASSERT((wsc->sc_flags & WDSC_DMA_MAPLOADED));

	wsc->sc_flags |= WDSC_DMA_ACTIVE;

	bus_dmamap_sync(wsc->sc_dmat, wsc->sc_dmamap, 0,
	    		wsc->sc_dmamap->dm_mapsize,
			BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);

	hpcdma_cntl(dsc, dsc->sc_dmacmd);	/* Thunderbirds are go! */

	return(wsc->sc_dmamap->dm_mapsize);
}

/*
 * Stop DMA and unload active DMA maps
 */
void
wdsc_dmastop(dev)
	struct wd33c93_softc *dev;
{
	struct wdsc_softc *wsc = (void *)dev;
	struct hpc_dma_softc *dsc = &wsc->sc_hpcdma;

	if (wsc->sc_flags & WDSC_DMA_ACTIVE) {
		if (dsc->sc_flags & HPCDMA_READ)
			hpcdma_flush(dsc);
		hpcdma_cntl(dsc, 0);	/* Stop DMA */
		bus_dmamap_sync(wsc->sc_dmat, wsc->sc_dmamap, 0,
		    wsc->sc_dmamap->dm_mapsize,
		    BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
	}
	if (wsc->sc_flags & WDSC_DMA_MAPLOADED)
		bus_dmamap_unload(wsc->sc_dmat, wsc->sc_dmamap);
	wsc->sc_flags &= ~(WDSC_DMA_ACTIVE | WDSC_DMA_MAPLOADED);
}

/*
 * Reset the controller.
 */
void
wdsc_reset(dev)
	struct wd33c93_softc *dev;
{
	struct wdsc_softc *wsc = (void *)dev;
	struct hpc_dma_softc *dsc = &wsc->sc_hpcdma;

	hpcdma_reset(dsc);
}

/*
 * WD33c93 SCSI controller interrupt
 */
int
wdsc_scsiintr(arg)
	void *arg;
{
	struct wd33c93_softc *dev = arg;
	struct wdsc_softc *wsc = arg;
	int found;

	found = wd33c93_intr(dev);
	if (found)
		wsc->sc_intrcnt.ev_count++;
	return(found);
}