/*-
 * Product specific probe and attach routines for:
 *      Buslogic BT946, BT948, BT956, BT958 SCSI controllers
 *
 * Copyright (c) 1995, 1997, 1998 Justin T. Gibbs
 * 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,
 *    without modification, immediately at the beginning of the file.
 * 2. 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 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/buslogic/bt_pci.c,v 1.25 2012/11/17 01:51:40 svnexp 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 <bus/pci/pcireg.h>
#include <bus/pci/pcivar.h>

#include "btreg.h"

#define BT_PCI_IOADDR   PCIR_BAR(0)
#define BT_PCI_MEMADDR  PCIR_BAR(1)

#define PCI_DEVICE_ID_BUSLOGIC_MULTIMASTER      0x1040104Bul
#define PCI_DEVICE_ID_BUSLOGIC_MULTIMASTER_NC   0x0140104Bul

static int
bt_pci_alloc_resources(device_t dev)
{
        int             command, type = 0, rid, zero;
        struct resource *regs = NULL;
        struct resource *irq = NULL;

        command = pci_read_config(dev, PCIR_COMMAND, /*bytes*/1);
#if 0
        /* XXX Memory Mapped I/O seems to cause problems */
        if (command & PCIM_CMD_MEMEN) {
                type = SYS_RES_MEMORY;
                rid = BT_PCI_MEMADDR;
                regs = bus_alloc_resource_any(dev, type, &rid, RF_ACTIVE);
        }
#else
        if (!regs && (command & PCIM_CMD_PORTEN)) {
                type = SYS_RES_IOPORT;
                rid = BT_PCI_IOADDR;
                regs = bus_alloc_resource_any(dev, type, &rid, RF_ACTIVE);
        }
#endif
        if (!regs)
                return (ENOMEM);
        
        zero = 0;
        irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &zero,
                                     RF_ACTIVE | RF_SHAREABLE);
        if (!irq) {
                bus_release_resource(dev, type, rid, regs);
                return (ENOMEM);
        }

        bt_init_softc(dev, regs, irq, 0);

        return (0);
}

static void
bt_pci_release_resources(device_t dev)
{
        struct bt_softc *bt = device_get_softc(dev);

        if (bt->port)
                /* XXX can't cope with memory registers anyway */
                bus_release_resource(dev, SYS_RES_IOPORT,
                                     BT_PCI_IOADDR, bt->port);
        if (bt->irq)
                bus_release_resource(dev, SYS_RES_IRQ, 0, bt->irq);
        bt_free_softc(dev);
}

static int
bt_pci_probe(device_t dev)
{
        switch (pci_get_devid(dev)) {
                case PCI_DEVICE_ID_BUSLOGIC_MULTIMASTER:
                case PCI_DEVICE_ID_BUSLOGIC_MULTIMASTER_NC:
                        device_set_desc(dev,
                            "Buslogic Multi-Master SCSI Host Adapter");
                        break;
                default:
                        return (ENXIO);
        }

        return (BUS_PROBE_DEFAULT);
}

static int
bt_pci_attach(device_t dev)
{
        struct bt_softc   *bt = device_get_softc(dev);
        int                error;

        /* Initialize softc */
        error = bt_pci_alloc_resources(dev);
        if (error) {
                device_printf(dev, "can't allocate resources in bt_pci_attach\n");
                return error;
        }

        /* Allocate a dmatag for our CCB DMA maps */
        /* 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    */ ~0,
                                /* maxsegsz     */ BUS_SPACE_MAXSIZE_32BIT,
                                /* flags        */ 0,
                                &bt->parent_dmat) != 0) {
                bt_pci_release_resources(dev);
                return (ENOMEM);
        }

        if (bt_probe(dev) || bt_fetch_adapter_info(dev) || bt_init(dev)) {
                bt_pci_release_resources(dev);
                return (ENXIO);
        }

        error = bt_attach(dev);

        if (error) {
                bt_pci_release_resources(dev);
                return (error);
        }

        return (0);
}

static device_method_t bt_pci_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         bt_pci_probe),
        DEVMETHOD(device_attach,        bt_pci_attach),

        DEVMETHOD_END
};

static driver_t bt_pci_driver = {
        "bt",
        bt_pci_methods,
        sizeof(struct bt_softc),
};

static devclass_t bt_devclass;

DRIVER_MODULE(bt, pci, bt_pci_driver, bt_devclass, NULL, NULL);
MODULE_DEPEND(bt, pci, 1, 1, 1);