/*-
 * Copyright (c) 2000 Matthew N. Dodd <winter@jurai.net>
 * All rights reserved.
 *
 * Copyright (c) 1997 Simon Shapiro
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 *      $FreeBSD: src/sys/dev/dpt/dpt_pci.c,v 1.17.2.2 2000/08/26 22:21:21 peter Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/thread2.h>

#include <bus/pci/pcireg.h>
#include <bus/pci/pcivar.h>

#include <bus/cam/scsi/scsi_all.h>

#include "dpt.h"

#define DPT_VENDOR_ID           0x1044
#define DPT_DEVICE_ID           0xa400

#define DPT_PCI_IOADDR          PCIR_MAPS               /* I/O Address */
#define DPT_PCI_MEMADDR         (PCIR_MAPS + 4)         /* Mem I/O Address */

#define ISA_PRIMARY_WD_ADDRESS  0x1f8

static int      dpt_pci_probe   (device_t);
static int      dpt_pci_attach  (device_t);

static int
dpt_pci_probe (device_t dev)
{
        if ((pci_get_vendor(dev) == DPT_VENDOR_ID) &&
            (pci_get_device(dev) == DPT_DEVICE_ID)) {
                device_set_desc(dev, "DPT Caching SCSI RAID Controller");
                return (0);
        }
        return (ENXIO);
}

static int
dpt_pci_attach (device_t dev)
{
        dpt_softc_t *   dpt;
        struct resource *io = NULL;
        struct resource *irq = NULL;
        int             rid;
        void *          ih;
        int             error = 0;

        int             iotype = 0;
        u_int32_t       command;

        command = pci_read_config(dev, PCIR_COMMAND, /*bytes*/1);

#ifdef DPT_ALLOW_MMIO
        if ((command & PCIM_CMD_MEMEN) != 0) {
                rid = DPT_PCI_MEMADDR;
                iotype = SYS_RES_MEMORY;
                io = bus_alloc_resource(dev, iotype, &rid, 0, ~0, 1, RF_ACTIVE);
        }
#endif
        if (io == NULL && (command &  PCIM_CMD_PORTEN) != 0) {
                rid = DPT_PCI_IOADDR;
                iotype = SYS_RES_IOPORT;
                io = bus_alloc_resource(dev, iotype, &rid, 0, ~0, 1, RF_ACTIVE);
        }

        if (io == NULL) {
                device_printf(dev, "can't allocate register resources\n");
                error = ENOMEM;
                goto bad;
        }

        rid = 0;
        irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
                                 RF_ACTIVE | RF_SHAREABLE);
        if (!irq) {
                device_printf(dev, "No irq?!\n");
                error = ENOMEM;
                goto bad;
        }

        /* Ensure busmastering is enabled */
        command |= PCIM_CMD_BUSMASTEREN;
        pci_write_config(dev, PCIR_COMMAND, command, /*bytes*/1);

        if (rman_get_start(io) == (ISA_PRIMARY_WD_ADDRESS - 0x10)) {
#ifdef DPT_DEBUG_WARN
                device_printf(dev, "Mapped as an IDE controller.  "
                                   "Disabling SCSI setup\n");
#endif
                error = ENXIO;
                goto bad;
        }

        /* Device registers are offset 0x10 into the register window.  FEH */
        dpt = dpt_alloc(dev, rman_get_bustag(io), rman_get_bushandle(io) + 0x10);
        if (dpt == NULL) {
                error = ENXIO;
                goto bad;
        }

        /* Allocate a dmatag representing the capabilities of this attachment */
        /* XXX Should be a child of the PCI bus dma tag */
        if (bus_dma_tag_create( /* parent    */ NULL,
                                /* alignemnt */ 1,
                                /* boundary  */ 0,
                                /* lowaddr   */ BUS_SPACE_MAXADDR_32BIT,
                                /* highaddr  */ BUS_SPACE_MAXADDR,
                                /* maxsize   */ BUS_SPACE_MAXSIZE_32BIT,
                                /* nsegments */ BUS_SPACE_UNRESTRICTED,
                                /* maxsegsz  */ BUS_SPACE_MAXSIZE_32BIT,
                                /* flags     */ 0,
                                &dpt->parent_dmat) != 0) {
                dpt_free(dpt);
                error = ENXIO;
                goto bad;
        }

        crit_enter();

        if (dpt_init(dpt) != 0) {
                dpt_free(dpt);
                error = ENXIO;
                crit_exit();
                goto bad;
        }

        /* Register with the XPT */
        dpt_attach(dpt);

        crit_exit();

        error = bus_setup_intr(dev, irq, 0, dpt_intr, dpt, 
                               &ih, NULL);
        if (error) {
                device_printf(dev, "Unable to register interrupt handler\n");
                error = ENXIO;
                goto bad;
        }

        return (error);

bad:
        if (io)
                bus_release_resource(dev, iotype, 0, io);
        if (irq)
                bus_release_resource(dev, SYS_RES_IRQ, 0, irq);

        return (error);
}

static device_method_t dpt_pci_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         dpt_pci_probe),
        DEVMETHOD(device_attach,        dpt_pci_attach),

        DEVMETHOD_END
};

static driver_t dpt_pci_driver = {
        "dpt",
        dpt_pci_methods,
        sizeof(dpt_softc_t),
};

static devclass_t dpt_devclass;

DRIVER_MODULE(dpt, pci, dpt_pci_driver, dpt_devclass, NULL, NULL);