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Initial revision

/*	$OpenBSD: kdb.c,v 1.11 2007/05/11 10:06:55 pedro Exp $ */
/*	$NetBSD: kdb.c,v 1.26 2001/11/13 12:51:34 lukem Exp $ */
/*
 * Copyright (c) 1996 Ludd, University of Lule}, Sweden.
 * All rights reserved.
 *
 * 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 at Ludd, University of 
 *	Lule}, Sweden and its contributors.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 */

/*
 * KDB50 disk device driver
 */
/*
 * TODO
 *   Implement node reset routine.
 *   Nices hardware error handling.
 */

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/user.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/sched.h>

#include <uvm/uvm_extern.h>

#ifdef __vax__
#include <machine/pte.h>
#include <machine/pcb.h>
#endif
#include <machine/bus.h>

#include <dev/bi/bireg.h>
#include <dev/bi/bivar.h>
#include <dev/bi/kdbreg.h>

#include <dev/mscp/mscp.h>
#include <dev/mscp/mscpreg.h>
#include <dev/mscp/mscpvar.h>

#define KDB_WL(adr, val) bus_space_write_4(sc->sc_iot, sc->sc_ioh, adr, val)
#define KDB_RL(adr) bus_space_read_4(sc->sc_iot, sc->sc_ioh, adr)
#define KDB_RS(adr) bus_space_read_2(sc->sc_iot, sc->sc_ioh, adr)

#define	    b_forw  b_hash.le_next
/*
 * Software status, per controller.
 */
struct	kdb_softc {
	struct	device sc_dev;		/* Autoconfig info */
	caddr_t	sc_kdb;			/* Struct for kdb communication */
	struct	mscp_softc *sc_softc;	/* MSCP info (per mscpvar.h) */
	bus_dma_tag_t sc_dmat;
	bus_dmamap_t sc_cmap;		/* Control structures */
	bus_space_tag_t sc_iot;
	bus_space_handle_t sc_ioh;
};

int	kdbmatch(struct device *, struct cfdata *, void *);
void	kdbattach(struct device *, struct device *, void *);
void	kdbreset(int);
void	kdbintr(void *);
void	kdbctlrdone(struct device *);
int	kdbprint(void *, const char *);
void	kdbsaerror(struct device *, int);
void	kdbgo(struct device *, struct mscp_xi *);

struct	cfattach kdb_ca = {
	sizeof(struct kdb_softc), kdbmatch, kdbattach
};

/*
 * More driver definitions, for generic MSCP code.
 */
struct	mscp_ctlr kdb_mscp_ctlr = {
	kdbctlrdone,
	kdbgo,
	kdbsaerror,
};

int
kdbprint(aux, name)
	void	*aux;
	const char	*name;
{
	if (name)
		printf("%s: mscpbus", name);
	return UNCONF;
}

/*
 * Poke at a supposed KDB to see if it is there.
 */
int
kdbmatch(parent, cf, aux)
	struct	device *parent;
	struct	cfdata *cf;
	void	*aux;
{
	struct bi_attach_args *ba = aux;

	if (bus_space_read_2(ba->ba_iot, ba->ba_ioh, BIREG_DTYPE) != BIDT_KDB50)
		return 0;

	if (cf->cf_loc[BICF_NODE] != BICF_NODE_DEFAULT &&
	    cf->cf_loc[BICF_NODE] != ba->ba_nodenr)
		return 0;

	return 1;
}

void
kdbattach(parent, self, aux)
	struct device *parent, *self;
	void *aux;
{
	struct	kdb_softc *sc = (void *)self;
	struct	bi_attach_args *ba = aux;
	struct	mscp_attach_args ma;
	volatile int i = 10000;
	int error, rseg;
	bus_dma_segment_t seg;

	printf("\n");
	bi_intr_establish(ba->ba_icookie, ba->ba_ivec, kdbintr, sc);

	sc->sc_iot = ba->ba_iot;
	sc->sc_ioh = ba->ba_ioh;
	sc->sc_dmat = ba->ba_dmat;

	/*
	 * Map the communication area and command and
	 * response packets into Unibus space.
	 */
	if ((error = bus_dmamem_alloc(sc->sc_dmat, sizeof(struct mscp_pack),
	    NBPG, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) {
		printf("Alloc ctrl area %d\n", error);
		return;
	}
	if ((error = bus_dmamem_map(sc->sc_dmat, &seg, rseg,
	    sizeof(struct mscp_pack), &sc->sc_kdb,
	    BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) {
		printf("Map ctrl area %d\n", error);
err:		bus_dmamem_free(sc->sc_dmat, &seg, rseg);
		return;
	}
	if ((error = bus_dmamap_create(sc->sc_dmat, sizeof(struct mscp_pack),
	    1, sizeof(struct mscp_pack), 0, BUS_DMA_NOWAIT, &sc->sc_cmap))) {
		printf("Create DMA map %d\n", error);
err2:		bus_dmamem_unmap(sc->sc_dmat, sc->sc_kdb,
		    sizeof(struct mscp_pack));
		goto err;
	}
	if ((error = bus_dmamap_load(sc->sc_dmat, sc->sc_cmap, 
	    sc->sc_kdb, sizeof(struct mscp_pack), 0, BUS_DMA_NOWAIT))) {
		printf("Load ctrl map %d\n", error);
		bus_dmamap_destroy(sc->sc_dmat, sc->sc_cmap);
		goto err2;
	}
	memset(sc->sc_kdb, 0, sizeof(struct mscp_pack));

	ma.ma_mc = &kdb_mscp_ctlr;
	ma.ma_type = MSCPBUS_DISK|MSCPBUS_KDB;
	ma.ma_uda = (struct mscp_pack *)sc->sc_kdb;
	ma.ma_softc = &sc->sc_softc;
	ma.ma_iot = sc->sc_iot;
	ma.ma_iph = sc->sc_ioh + KDB_IP;
	ma.ma_sah = sc->sc_ioh + KDB_SA;
	ma.ma_swh = sc->sc_ioh + KDB_SW;
	ma.ma_dmat = sc->sc_dmat;
	ma.ma_dmam = sc->sc_cmap;
	ma.ma_ivec = ba->ba_ivec;
	ma.ma_ctlrnr = ba->ba_nodenr;
	ma.ma_adapnr = ba->ba_busnr;

	KDB_WL(BIREG_VAXBICSR, KDB_RL(BIREG_VAXBICSR) | BICSR_NRST);
	while (i--) /* Need delay??? */
		;
	KDB_WL(BIREG_INTRDES, ba->ba_intcpu); /* Interrupt on CPU # */
	KDB_WL(BIREG_BCICSR, KDB_RL(BIREG_BCICSR) |
	    BCI_STOPEN | BCI_IDENTEN | BCI_UINTEN | BCI_INTEN);
	KDB_WL(BIREG_UINTRCSR, ba->ba_ivec);
	config_found(&sc->sc_dev, &ma, kdbprint);
}

void
kdbgo(usc, mxi)
	struct device *usc;
	struct mscp_xi *mxi;
{
	struct kdb_softc *sc = (void *)usc;
	struct buf *bp = mxi->mxi_bp;
	struct mscp *mp = mxi->mxi_mp;
	u_int32_t addr = (u_int32_t)bp->b_data;
	u_int32_t mapaddr;
	int err;

	/*
	 * The KDB50 wants to read VAX Page tables directly, therefore
	 * the result from bus_dmamap_load() is uninteresting. (But it
	 * should never fail!).
	 *
	 * On VAX, point to the corresponding page tables. (user/sys)
	 * On other systems, do something else... 
	 */
	err = bus_dmamap_load(sc->sc_dmat, mxi->mxi_dmam, bp->b_data,
	    bp->b_bcount, (bp->b_flags & B_PHYS ? bp->b_proc : 0),
	    BUS_DMA_NOWAIT);

	if (err) /* Shouldn't happen */
		panic("kdbgo: bus_dmamap_load: error %d", err);

#ifdef __vax__
	/*
	 * Get a pointer to the pte pointing out the first virtual address.
	 * Use different ways in kernel and user space.
	 */
	if ((bp->b_flags & B_PHYS) == 0) {
		mapaddr = ((u_int32_t)kvtopte(addr)) & ~KERNBASE;
	} else {
		struct pcb *pcb;
		u_int32_t eaddr;

		/*
		 * We check if the PTE's needed crosses a page boundary.
		 * If they do; only transfer the amount of data that is
		 * mapped by the first PTE page and led the system handle
		 * the rest of the data.
		 */
		pcb = &bp->b_proc->p_addr->u_pcb;
		mapaddr = (u_int32_t)uvtopte(addr, pcb);
		eaddr = (u_int32_t)uvtopte(addr + (bp->b_bcount - 1), pcb);
		if (trunc_page(mapaddr) != trunc_page(eaddr)) {
			mp->mscp_seq.seq_bytecount =
			    (((round_page(mapaddr) - mapaddr)/4) * 512);
		}
		mapaddr = kvtophys(mapaddr);
	}
#else
#error Must write code to handle KDB50 on non-vax.
#endif

	mp->mscp_seq.seq_mapbase = mapaddr;
	mxi->mxi_dmam->dm_segs[0].ds_addr = (addr & 511) | KDB_MAP;
	mscp_dgo(sc->sc_softc, mxi);
}

void
kdbsaerror(usc, doreset)
	struct device *usc;
	int doreset;
{
	struct	kdb_softc *sc = (void *)usc;

	if ((KDB_RS(KDB_SA) & MP_ERR) == 0)
		return;
	printf("%s: controller error, sa=0x%x\n", sc->sc_dev.dv_xname,
	    KDB_RS(KDB_SA));
	/* What to do now??? */
}

/*
 * Interrupt routine.  Depending on the state of the controller,
 * continue initialisation, or acknowledge command and response
 * interrupts, and process responses.
 */
void
kdbintr(void *arg)
{
	struct kdb_softc *sc = arg;

	if (KDB_RS(KDB_SA) & MP_ERR) {	/* ctlr fatal error */
		kdbsaerror(&sc->sc_dev, 1);
		return;
	}
	KERNEL_LOCK();
	mscp_intr(sc->sc_softc);
	KERNEL_UNLOCK();
}

#ifdef notyet
/*
 * The KDB50 has been reset.  Reinitialise the controller
 * and requeue outstanding I/O.
 */
void
kdbreset(ctlr)
	int ctlr;
{
	struct kdb_softc *sc;

	sc = kdb_cd.cd_devs[ctlr];
	printf(" kdb%d", ctlr);


	/* reset queues and requeue pending transfers */
	mscp_requeue(sc->sc_softc);

	/*
	 * If it fails to initialise we will notice later and
	 * try again (and again...).  Do not call kdbstart()
	 * here; it will be done after the controller finishes
	 * initialisation.
	 */
	if (kdbinit(sc))
		printf(" (hung)");
}
#endif

void
kdbctlrdone(usc)
	struct device *usc;
{
}