/*      $NetBSD: uha_isa.c,v 1.42 2019/11/12 13:10:51 msaitoh Exp $     */

/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Charles M. Hannum.
*
* 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uha_isa.c,v 1.42 2019/11/12 13:10:51 msaitoh Exp $");

#include "opt_ddb.h"

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

#include <sys/bus.h>
#include <sys/intr.h>

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

#include <dev/isa/isavar.h>
#include <dev/isa/isadmavar.h>

#include <dev/ic/uhareg.h>
#include <dev/ic/uhavar.h>

#define UHA_ISA_IOSIZE  16

int     uha_isa_probe(device_t, cfdata_t, void *);
void    uha_isa_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(uha_isa, sizeof(struct uha_softc),
   uha_isa_probe, uha_isa_attach, NULL, NULL);

#ifndef DDB
#define Debugger() panic("should call debugger here (uha_isa.c)")
#endif /* ! DDB */

int     u14_find(bus_space_tag_t, bus_space_handle_t, struct uha_probe_data *);
void    u14_start_mbox(struct uha_softc *, struct uha_mscp *);
int     u14_poll(struct uha_softc *, struct scsipi_xfer *, int);
int     u14_intr(void *);
void    u14_init(struct uha_softc *);

/*
* Check the slots looking for a board we recognise
* If we find one, note its address (slot) and call
* the actual probe routine to check it out.
*/
int
uha_isa_probe(device_t parent, cfdata_t match, void *aux)
{
       struct isa_attach_args *ia = aux;
       bus_space_tag_t iot = ia->ia_iot;
       bus_space_handle_t ioh;
       struct uha_probe_data upd;
       int rv;

       if (ia->ia_nio < 1)
               return (0);
       if (ia->ia_nirq < 1)
               return (0);
       if (ia->ia_ndrq < 1)
               return (0);

       if (ISA_DIRECT_CONFIG(ia))
               return (0);

       /* Disallow wildcarded i/o address. */
       if (ia->ia_io[0].ir_addr == ISA_UNKNOWN_PORT)
               return (0);

       if (bus_space_map(iot, ia->ia_io[0].ir_addr, UHA_ISA_IOSIZE, 0, &ioh))
               return (0);

       rv = u14_find(iot, ioh, &upd);

       bus_space_unmap(iot, ioh, UHA_ISA_IOSIZE);

       if (rv) {
               if (ia->ia_irq[0].ir_irq != ISA_UNKNOWN_IRQ &&
                   ia->ia_irq[0].ir_irq != upd.sc_irq)
                       return (0);
               if (ia->ia_drq[0].ir_drq != ISA_UNKNOWN_DRQ &&
                   ia->ia_drq[0].ir_drq != upd.sc_drq)
                       return (0);

               ia->ia_nio = 1;
               ia->ia_io[0].ir_size = UHA_ISA_IOSIZE;

               ia->ia_nirq = 1;
               ia->ia_irq[0].ir_irq = upd.sc_irq;

               ia->ia_ndrq = 1;
               ia->ia_drq[0].ir_drq = upd.sc_drq;

               ia->ia_niomem = 0;
       }
       return (rv);
}

/*
* Attach all the sub-devices we can find
*/
void
uha_isa_attach(device_t parent, device_t self, void *aux)
{
       struct isa_attach_args *ia = aux;
       struct uha_softc *sc = device_private(self);
       bus_space_tag_t iot = ia->ia_iot;
       bus_dma_tag_t dmat = ia->ia_dmat;
       bus_space_handle_t ioh;
       struct uha_probe_data upd;
       isa_chipset_tag_t ic = ia->ia_ic;
       int error;

       sc->sc_dev = self;
       printf("\n");

       if (bus_space_map(iot, ia->ia_io[0].ir_addr, UHA_ISA_IOSIZE, 0, &ioh)) {
               aprint_error_dev(sc->sc_dev, "can't map i/o space\n");
               return;
       }

       sc->sc_iot = iot;
       sc->sc_ioh = ioh;
       sc->sc_dmat = dmat;
       if (!u14_find(iot, ioh, &upd)) {
               aprint_error_dev(sc->sc_dev, "u14_find failed\n");
               return;
       }

       if (upd.sc_drq != -1) {
               sc->sc_dmaflags = 0;
               if ((error = isa_dmacascade(ic, upd.sc_drq)) != 0) {
                       aprint_error_dev(sc->sc_dev, "unable to cascade DRQ, error = %d\n", error);
                       return;
               }
       } else {
               /*
                * We have a VLB controller, and can do 32-bit DMA.
                */
               sc->sc_dmaflags = ISABUS_DMA_32BIT;
       }

       sc->sc_ih = isa_intr_establish(ic, upd.sc_irq, IST_EDGE, IPL_BIO,
           u14_intr, sc);
       if (sc->sc_ih == NULL) {
               aprint_error_dev(sc->sc_dev, "couldn't establish interrupt\n");
               return;
       }

       /* Save function pointers for later use. */
       sc->start_mbox = u14_start_mbox;
       sc->poll = u14_poll;
       sc->init = u14_init;

       uha_attach(sc, &upd);
}

/*
* Start the board, ready for normal operation
*/
int
u14_find(bus_space_tag_t iot, bus_space_handle_t ioh, struct uha_probe_data *sc)
{
       u_int16_t model, config;
       int irq, drq;
       int resetcount = 4000;  /* 4 secs? */

       model = (bus_space_read_1(iot, ioh, U14_ID + 0) << 8) |
               (bus_space_read_1(iot, ioh, U14_ID + 1) << 0);
       if ((model & 0xfff0) != 0x5640)
               return (0);

       config = (bus_space_read_1(iot, ioh, U14_CONFIG + 0) << 8) |
                (bus_space_read_1(iot, ioh, U14_CONFIG + 1) << 0);

       switch (model & 0x000f) {
       case 0x0000:
               switch (config & U14_DMA_MASK) {
               case U14_DMA_CH5:
                       drq = 5;
                       break;
               case U14_DMA_CH6:
                       drq = 6;
                       break;
               case U14_DMA_CH7:
                       drq = 7;
                       break;
               default:
                       printf("u14_find: illegal drq setting %x\n",
                           config & U14_DMA_MASK);
                       return (0);
               }
               break;
       case 0x0001:
               /* This is a 34f, and doesn't need an ISA DMA channel. */
               drq = -1;
               break;
       default:
               printf("u14_find: unknown model %x\n", model);
               return (0);
       }

       switch (config & U14_IRQ_MASK) {
       case U14_IRQ10:
               irq = 10;
               break;
       case U14_IRQ11:
               irq = 11;
               break;
       case U14_IRQ14:
               irq = 14;
               break;
       case U14_IRQ15:
               irq = 15;
               break;
       default:
               printf("u14_find: illegal irq setting %x\n",
                   config & U14_IRQ_MASK);
               return (0);
       }

       bus_space_write_1(iot, ioh, U14_LINT, UHA_ASRST);

       while (--resetcount) {
               if (bus_space_read_1(iot, ioh, U14_LINT))
                       break;
               delay(1000);    /* 1 mSec per loop */
       }
       if (!resetcount) {
               printf("u14_find: board timed out during reset\n");
               return (0);
       }

       /* if we want to fill in softc, do so now */
       if (sc) {
               sc->sc_irq = irq;
               sc->sc_drq = drq;
               sc->sc_scsi_dev = config & U14_HOSTID_MASK;
       }

       return (1);
}

/*
* Function to send a command out through a mailbox
*/
void
u14_start_mbox(struct uha_softc *sc, struct uha_mscp *mscp)
{
       bus_space_tag_t iot = sc->sc_iot;
       bus_space_handle_t ioh = sc->sc_ioh;
       int spincount = 100000; /* 1s should be enough */

       while (--spincount) {
               if ((bus_space_read_1(iot, ioh, U14_LINT) & U14_LDIP) == 0)
                       break;
               delay(100);
       }
       if (!spincount) {
               aprint_error_dev(sc->sc_dev, "uha_start_mbox, board not responding\n");
               Debugger();
       }

       bus_space_write_4(iot, ioh, U14_OGMPTR,
           sc->sc_dmamap_mscp->dm_segs[0].ds_addr + UHA_MSCP_OFF(mscp));
       if (mscp->flags & MSCP_ABORT)
               bus_space_write_1(iot, ioh, U14_LINT, U14_ABORT);
       else
               bus_space_write_1(iot, ioh, U14_LINT, U14_OGMFULL);

       if ((mscp->xs->xs_control & XS_CTL_POLL) == 0)
               callout_reset(&mscp->xs->xs_callout,
                   mstohz(mscp->timeout), uha_timeout, mscp);
}

/*
* Function to poll for command completion when in poll mode.
*
*      wait = timeout in msec
*/
int
u14_poll(struct uha_softc *sc, struct scsipi_xfer *xs, int count)
{
       bus_space_tag_t iot = sc->sc_iot;
       bus_space_handle_t ioh = sc->sc_ioh;

       while (count) {
               /*
                * If we had interrupts enabled, would we
                * have got an interrupt?
                */
               if (bus_space_read_1(iot, ioh, U14_SINT) & U14_SDIP)
                       u14_intr(sc);
               if (xs->xs_status & XS_STS_DONE)
                       return (0);
               delay(1000);
               count--;
       }
       return (1);
}

/*
* Catch an interrupt from the adaptor
*/
int
u14_intr(void *arg)
{
       struct uha_softc *sc = arg;
       bus_space_tag_t iot = sc->sc_iot;
       bus_space_handle_t ioh = sc->sc_ioh;
       struct uha_mscp *mscp;
       u_char uhastat;
       u_long mboxval;

#ifdef  UHADEBUG
       printf("%s: uhaintr ", device_xname(sc->sc_dev));
#endif /*UHADEBUG */

       if ((bus_space_read_1(iot, ioh, U14_SINT) & U14_SDIP) == 0)
               return (0);

       for (;;) {
               /*
                * First get all the information and then
                * acknowledge the interrupt
                */
               uhastat = bus_space_read_1(iot, ioh, U14_SINT);
               mboxval = bus_space_read_4(iot, ioh, U14_ICMPTR);
               /* XXX Send an ABORT_ACK instead? */
               bus_space_write_1(iot, ioh, U14_SINT, U14_ICM_ACK);

#ifdef  UHADEBUG
               printf("status = 0x%x ", uhastat);
#else
               __USE(uhastat);
#endif /*UHADEBUG*/

               /*
                * Process the completed operation
                */
               mscp = uha_mscp_phys_kv(sc, mboxval);
               if (!mscp) {
                       printf("%s: BAD MSCP RETURNED!\n",
                           device_xname(sc->sc_dev));
                       continue;       /* whatever it was, it'll timeout */
               }

               callout_stop(&mscp->xs->xs_callout);
               uha_done(sc, mscp);

               if ((bus_space_read_1(iot, ioh, U14_SINT) & U14_SDIP) == 0)
                       return (1);
       }
}

void
u14_init(struct uha_softc *sc)
{
       bus_space_tag_t iot = sc->sc_iot;
       bus_space_handle_t ioh = sc->sc_ioh;

       /* make sure interrupts are enabled */
#ifdef UHADEBUG
       printf("u14_init: lmask=%02x, smask=%02x\n",
           bus_space_read_1(iot, ioh, U14_LMASK),
           bus_space_read_1(iot, ioh, U14_SMASK));
#endif
       bus_space_write_1(iot, ioh, U14_LMASK, 0xd1);   /* XXX */
       bus_space_write_1(iot, ioh, U14_SMASK, 0x91);   /* XXX */
}

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