/*	$NetBSD: ld_icp.c,v 1.31 2017/02/27 21:32:33 jdolecek Exp $	*/

/*-
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Andrew Doran.
 *
 * 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.
 */

/*
 * ICP-Vortex "GDT" front-end for ld(4) driver.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ld_icp.c,v 1.31 2017/02/27 21:32:33 jdolecek Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/endian.h>
#include <sys/dkio.h>
#include <sys/disk.h>
#include <sys/module.h>
#include <sys/bus.h>

#include <dev/ldvar.h>

#include <dev/ic/icpreg.h>
#include <dev/ic/icpvar.h>

#include "ioconf.h"

struct ld_icp_softc {
	struct	ld_softc sc_ld;
	int	sc_hwunit;
};

static void	ld_icp_attach(device_t, device_t, void *);
static int	ld_icp_detach(device_t, int);
static int	ld_icp_dobio(struct ld_icp_softc *, void *, int, int, int,
		     struct buf *);
static int	ld_icp_dump(struct ld_softc *, void *, int, int);
static int	ld_icp_flush(struct ld_softc *, bool);
static int	ld_icp_ioctl(struct ld_softc *, u_long, void *, int32_t, bool);
static void	ld_icp_intr(struct icp_ccb *);
static int	ld_icp_match(device_t, cfdata_t, void *);
static int	ld_icp_start(struct ld_softc *, struct buf *);

static void	ld_icp_adjqparam(device_t, int);

CFATTACH_DECL_NEW(ld_icp, sizeof(struct ld_icp_softc),
    ld_icp_match, ld_icp_attach, ld_icp_detach, NULL);

static const struct icp_servicecb ld_icp_servicecb = {
	ld_icp_adjqparam,
};

static int
ld_icp_match(device_t parent, cfdata_t match, void *aux)
{
	struct icp_attach_args *icpa;

	icpa = aux;

	return (icpa->icpa_unit < ICPA_UNIT_SCSI);
}

static void
ld_icp_attach(device_t parent, device_t self, void *aux)
{
	struct icp_attach_args *icpa = aux;
	struct ld_icp_softc *sc = device_private(self);
	struct ld_softc *ld = &sc->sc_ld;
	struct icp_softc *icp = device_private(parent);
	struct icp_cachedrv *cd = &icp->icp_cdr[icpa->icpa_unit];
	struct icp_cdevinfo *cdi;
	const char *str;
	int t;

	ld->sc_dv = self;

	icp_register_servicecb(icp, icpa->icpa_unit, &ld_icp_servicecb);

	sc->sc_hwunit = icpa->icpa_unit;
	ld->sc_maxxfer = ICP_MAX_XFER;
	ld->sc_secsize = ICP_SECTOR_SIZE;
	ld->sc_start = ld_icp_start;
	ld->sc_dump = ld_icp_dump;
	ld->sc_ioctl = ld_icp_ioctl;
	ld->sc_secperunit = cd->cd_size;
	ld->sc_flags = LDF_ENABLED;
	ld->sc_maxqueuecnt = icp->icp_openings;

	if (!icp_cmd(icp, ICP_CACHESERVICE, ICP_IOCTL, ICP_CACHE_DRV_INFO,
	    sc->sc_hwunit, sizeof(struct icp_cdevinfo))) {
		aprint_error(": unable to retrieve device info\n");
		ld->sc_flags = LDF_ENABLED;
		goto out;
	}
	cdi = (struct icp_cdevinfo *)icp->icp_scr;

	aprint_normal(": <%.8s>, ", cdi->ld_name);
	t = le32toh(cdi->ld_dtype) >> 16;

	/*
	 * Print device type.
	 */
	if (le32toh(cdi->ld_dcnt) > 1 || le32toh(cdi->ld_slave) != -1)
		str = "RAID-1";
	else if (t == 0)
		str = "JBOD";
	else if (t == 1)
		str = "RAID-0";
	else if (t == 2)
		str = "Chain";
	else
		str = "unknown type";

	aprint_normal("type: %s, ", str);

	/*
	 * Print device status.
	 */
	if (t > 2)
		str = "missing";
	else if ((cdi->ld_error & 1) != 0) {
		str = "fault";
		ld->sc_flags = LDF_ENABLED;
	} else if ((cdi->ld_error & 2) != 0)
		str = "invalid";
	else {
		str = "optimal";
		ld->sc_flags = LDF_ENABLED;
	}

	aprint_normal("status: %s\n", str);

 out:
	ldattach(ld, BUFQ_DISK_DEFAULT_STRAT);
}

static int
ld_icp_detach(device_t dv, int flags)
{
	int rv;

	if ((rv = ldbegindetach((struct ld_softc *)dv, flags)) != 0)
		return (rv);
	ldenddetach((struct ld_softc *) dv);

	return (0);
}

static int
ld_icp_dobio(struct ld_icp_softc *sc, void *data, int datasize, int blkno,
	     int dowrite, struct buf *bp)
{
	struct icp_cachecmd *cc;
	struct icp_ccb *ic;
	struct icp_softc *icp;
	int s, rv;

	icp = device_private(device_parent(sc->sc_ld.sc_dv));

	/*
	 * Allocate a command control block.
	 */
	if (__predict_false((ic = icp_ccb_alloc(icp)) == NULL))
		return (EAGAIN);

	/*
	 * Map the data transfer.
	 */
	cc = &ic->ic_cmd.cmd_packet.cc;
	ic->ic_sg = cc->cc_sg;
	ic->ic_service = ICP_CACHESERVICE;

	rv = icp_ccb_map(icp, ic, data, datasize,
	    dowrite ? IC_XFER_OUT : IC_XFER_IN);
	if (rv != 0) {
		icp_ccb_free(icp, ic);
		return (rv);
	}

	/*
	 * Build the command.
	 */
	ic->ic_cmd.cmd_opcode = htole16((dowrite ? ICP_WRITE : ICP_READ));
	cc->cc_deviceno = htole16(sc->sc_hwunit);
	cc->cc_blockno = htole32(blkno);
	cc->cc_blockcnt = htole32(datasize / ICP_SECTOR_SIZE);
	cc->cc_addr = ~0;	/* scatter gather */
	cc->cc_nsgent = htole32(ic->ic_nsgent);

	ic->ic_cmdlen = (u_long)ic->ic_sg - (u_long)&ic->ic_cmd +
	    ic->ic_nsgent * sizeof(*ic->ic_sg);

	/*
	 * Fire it off to the controller.
	 */
	if (bp == NULL) {
		s = splbio();
		rv = icp_ccb_poll(icp, ic, 10000);
		icp_ccb_unmap(icp, ic);
		icp_ccb_free(icp, ic);
		splx(s);
	} else {
 		ic->ic_intr = ld_icp_intr;
		ic->ic_context = bp;
		ic->ic_dv = sc->sc_ld.sc_dv;
		icp_ccb_enqueue(icp, ic);
	}

	return (rv);
}

static int
ld_icp_start(struct ld_softc *ld, struct buf *bp)
{

	return (ld_icp_dobio((struct ld_icp_softc *)ld, bp->b_data,
	    bp->b_bcount, bp->b_rawblkno, (bp->b_flags & B_READ) == 0, bp));
}

static int
ld_icp_dump(struct ld_softc *ld, void *data, int blkno, int blkcnt)
{

	return (ld_icp_dobio((struct ld_icp_softc *)ld, data,
	    blkcnt * ld->sc_secsize, blkno, 1, NULL));
}

/* ARGSUSED */
static int
ld_icp_flush(struct ld_softc *ld, bool poll)
{
	struct ld_icp_softc *sc;
	struct icp_softc *icp;
	struct icp_cachecmd *cc;
	struct icp_ccb *ic;
	int rv;

	sc = (struct ld_icp_softc *)ld;
	icp = device_private(device_parent(ld->sc_dv));

	ic = icp_ccb_alloc_wait(icp);
	ic->ic_cmd.cmd_opcode = htole16(ICP_FLUSH);

	cc = &ic->ic_cmd.cmd_packet.cc;
	cc->cc_deviceno = htole16(sc->sc_hwunit);
	cc->cc_blockno = htole32(1);
	cc->cc_blockcnt = 0;
	cc->cc_addr = 0;
	cc->cc_nsgent = 0;

	ic->ic_cmdlen = (u_long)&cc->cc_sg - (u_long)&ic->ic_cmd;
	ic->ic_service = ICP_CACHESERVICE;

	rv = icp_ccb_wait(icp, ic, 30000);
	icp_ccb_free(icp, ic);

	return (rv);
}

static int
ld_icp_ioctl(struct ld_softc *ld, u_long cmd, void *addr, int32_t flag, bool poll)
{
        int error;

        switch (cmd) {
        case DIOCCACHESYNC:
		error = ld_icp_flush(ld, poll);
		break;

	default:
		error = EPASSTHROUGH;
		break;
	}

	return error;
}

static void
ld_icp_intr(struct icp_ccb *ic)
{
	struct buf *bp;
	struct ld_icp_softc *sc;
	struct icp_softc *icp;

	bp = ic->ic_context;
	sc = device_private(ic->ic_dv);
	icp = device_private(device_parent(sc->sc_ld.sc_dv));

	if (ic->ic_status != ICP_S_OK) {
		aprint_error_dev(ic->ic_dv, "request failed; status=0x%04x\n",
		    ic->ic_status);
		bp->b_error = EIO;
		bp->b_resid = bp->b_bcount;

		icp->icp_evt.size = sizeof(icp->icp_evt.eu.sync);
		icp->icp_evt.eu.sync.ionode = device_unit(icp->icp_dv);
		icp->icp_evt.eu.sync.service = icp->icp_service;
		icp->icp_evt.eu.sync.status = icp->icp_status;
		icp->icp_evt.eu.sync.info = icp->icp_info;
		icp->icp_evt.eu.sync.hostdrive = sc->sc_hwunit;
		if (icp->icp_status >= 0x8000)
			icp_store_event(icp, GDT_ES_SYNC, 0, &icp->icp_evt);
		else
			icp_store_event(icp, GDT_ES_SYNC, icp->icp_service,
			    &icp->icp_evt);
	} else
		bp->b_resid = 0;

	icp_ccb_unmap(icp, ic);
	icp_ccb_free(icp, ic);
	lddone(&sc->sc_ld, bp);
}

static void
ld_icp_adjqparam(device_t dv, int openings)
{

	ldadjqparam((struct ld_softc *) dv, openings);
}

MODULE(MODULE_CLASS_DRIVER, ld_icp, "ld");	/* no icp module yet */

#ifdef _MODULE
/*
 * XXX Don't allow ioconf.c to redefine the "struct cfdriver ld_cd"
 * XXX it will be defined in the common-code module
 */     
#undef  CFDRIVER_DECL
#define CFDRIVER_DECL(name, class, attr)
#include "ioconf.c"
#endif
        
static int
ld_icp_modcmd(modcmd_t cmd, void *opaque)
{       
#ifdef _MODULE
	/*
	 * We ignore the cfdriver_vec[] that ioconf provides, since
	 * the cfdrivers are attached already.
	 */
	static struct cfdriver * const no_cfdriver_vec[] = { NULL };
#endif
	int error = 0;
        
#ifdef _MODULE 
	switch (cmd) {
	case MODULE_CMD_INIT:
		error = config_init_component(no_cfdriver_vec,
		    cfattach_ioconf_ld_icp, cfdata_ioconf_ld_icp);
		break;
	case MODULE_CMD_FINI:
		error = config_fini_component(no_cfdriver_vec,
		    cfattach_ioconf_ld_icp, cfdata_ioconf_ld_icp);
		break;
	default:
		error = ENOTTY;
		break;
	}
#endif

	return error;
}