freebsd-skq/sys/dev/ata/ata-pci.c

/*-
 * Copyright (c) 1998 - 2008 Søren Schmidt <sos@FreeBSD.org>
 * 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. 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 ``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.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include "opt_ata.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/ata.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/sema.h>
#include <sys/taskqueue.h>
#include <vm/uma.h>
#include <machine/stdarg.h>
#include <machine/resource.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/ata/ata-all.h>
#include <dev/ata/ata-pci.h>
#include <ata_if.h>

/* local vars */
static MALLOC_DEFINE(M_ATAPCI, "ata_pci", "ATA driver PCI");

/* misc defines */
#define IOMASK                  0xfffffffc

/* local prototypes */
static int ata_generic_chipinit(device_t dev);
static void ata_generic_setmode(device_t dev, int mode);

/*
 * generic PCI ATA device probe
 */
int
ata_pci_probe(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    char buffer[64];

    /* is this a storage class device ? */
    if (pci_get_class(dev) != PCIC_STORAGE)
	return ENXIO;

    /* is this an IDE/ATA type device ? */
    if (pci_get_subclass(dev) != PCIS_STORAGE_IDE)
	return ENXIO;
    
    sprintf(buffer, "%s ATA controller", ata_pcivendor2str(dev));
    device_set_desc_copy(dev, buffer);
    ctlr->chipinit = ata_generic_chipinit;

    /* we are a low priority handler */
    return -100;
}

int
ata_pci_attach(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    u_int32_t cmd;
    int unit;

    /* do chipset specific setups only needed once */
    if (ata_legacy(dev) || pci_read_config(dev, PCIR_BAR(2), 4) & IOMASK)
	ctlr->channels = 2;
    else
	ctlr->channels = 1;
    ctlr->allocate = ata_pci_allocate;
    ctlr->dmainit = ata_pci_dmainit;
    ctlr->dev = dev;

    /* if needed try to enable busmastering */
    cmd = pci_read_config(dev, PCIR_COMMAND, 2);
    if (!(cmd & PCIM_CMD_BUSMASTEREN)) {
	pci_write_config(dev, PCIR_COMMAND, cmd | PCIM_CMD_BUSMASTEREN, 2);
	cmd = pci_read_config(dev, PCIR_COMMAND, 2);
    }

    /* if busmastering mode "stuck" use it */
    if ((cmd & PCIM_CMD_BUSMASTEREN) == PCIM_CMD_BUSMASTEREN) {
	ctlr->r_type1 = SYS_RES_IOPORT;
	ctlr->r_rid1 = ATA_BMADDR_RID;
	ctlr->r_res1 = bus_alloc_resource_any(dev, ctlr->r_type1, &ctlr->r_rid1,
					      RF_ACTIVE);
    }

    if (ctlr->chipinit(dev))
	return ENXIO;

    /* attach all channels on this controller */
    for (unit = 0; unit < ctlr->channels; unit++) {
	if ((unit == 0 || unit == 1) && ata_legacy(dev)) {
	    device_add_child(dev, "ata", unit);
	    continue;
	}
	device_add_child(dev, "ata", devclass_find_free_unit(ata_devclass, 2));
    }
    bus_generic_attach(dev);
    return 0;
}

int
ata_pci_detach(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    device_t *children;
    int nchildren, i;

    /* detach & delete all children */
    if (!device_get_children(dev, &children, &nchildren)) {
	for (i = 0; i < nchildren; i++)
	    device_delete_child(dev, children[i]);
	free(children, M_TEMP);
    }

    if (ctlr->r_irq) {
	bus_teardown_intr(dev, ctlr->r_irq, ctlr->handle);
	bus_release_resource(dev, SYS_RES_IRQ, ATA_IRQ_RID, ctlr->r_irq);
    }
    if (ctlr->r_res2)
	bus_release_resource(dev, ctlr->r_type2, ctlr->r_rid2, ctlr->r_res2);
    if (ctlr->r_res1)
	bus_release_resource(dev, ctlr->r_type1, ctlr->r_rid1, ctlr->r_res1);

    return 0;
}

int
ata_pci_suspend(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    int error = 0;
 
    bus_generic_suspend(dev);
    if (ctlr->suspend)
	error = ctlr->suspend(dev);
    return error;
}
  
int
ata_pci_resume(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    int error = 0;
 
    if (ctlr->resume)
	error = ctlr->resume(dev);
    bus_generic_resume(dev);
    return error;
}

struct resource *
ata_pci_alloc_resource(device_t dev, device_t child, int type, int *rid,
		       u_long start, u_long end, u_long count, u_int flags)
{
    struct ata_pci_controller *controller = device_get_softc(dev);
    int unit = ((struct ata_channel *)device_get_softc(child))->unit;
    struct resource *res = NULL;
    int myrid;

    if (type == SYS_RES_IOPORT) {
	switch (*rid) {
	case ATA_IOADDR_RID:
	    if (ata_legacy(dev)) {
		start = (unit ? ATA_SECONDARY : ATA_PRIMARY);
		count = ATA_IOSIZE;
		end = start + count - 1;
	    }
	    myrid = PCIR_BAR(0) + (unit << 3);
	    res = BUS_ALLOC_RESOURCE(device_get_parent(dev), dev,
				     SYS_RES_IOPORT, &myrid,
				     start, end, count, flags);
	    break;

	case ATA_CTLADDR_RID:
	    if (ata_legacy(dev)) {
		start = (unit ? ATA_SECONDARY : ATA_PRIMARY) + ATA_CTLOFFSET;
		count = ATA_CTLIOSIZE;
		end = start + count - 1;
	    }
	    myrid = PCIR_BAR(1) + (unit << 3);
	    res = BUS_ALLOC_RESOURCE(device_get_parent(dev), dev,
				     SYS_RES_IOPORT, &myrid,
				     start, end, count, flags);
	    break;
	}
    }
    if (type == SYS_RES_IRQ && *rid == ATA_IRQ_RID) {
	if (ata_legacy(dev)) {
	    int irq = (unit == 0 ? 14 : 15);
	    
	    res = BUS_ALLOC_RESOURCE(device_get_parent(dev), child,
				     SYS_RES_IRQ, rid, irq, irq, 1, flags);
	}
	else
	    res = controller->r_irq;
    }
    return res;
}

int
ata_pci_release_resource(device_t dev, device_t child, int type, int rid,
			 struct resource *r)
{
    int unit = ((struct ata_channel *)device_get_softc(child))->unit;

    if (type == SYS_RES_IOPORT) {
	switch (rid) {
	case ATA_IOADDR_RID:
	    return BUS_RELEASE_RESOURCE(device_get_parent(dev), dev,
					SYS_RES_IOPORT,
					PCIR_BAR(0) + (unit << 3), r);
	    break;

	case ATA_CTLADDR_RID:
	    return BUS_RELEASE_RESOURCE(device_get_parent(dev), dev,
					SYS_RES_IOPORT,
					PCIR_BAR(1) + (unit << 3), r);
	    break;
	default:
	    return ENOENT;
	}
    }
    if (type == SYS_RES_IRQ) {
	if (rid != ATA_IRQ_RID)
	    return ENOENT;

	if (ata_legacy(dev)) {
	    return BUS_RELEASE_RESOURCE(device_get_parent(dev), child,
					SYS_RES_IRQ, rid, r);
	}
	else  
	    return 0;
    }
    return EINVAL;
}

int
ata_pci_setup_intr(device_t dev, device_t child, struct resource *irq, 
		   int flags, driver_filter_t *filter, driver_intr_t *function, 
		   void *argument, void **cookiep)
{
    if (ata_legacy(dev)) {
	return BUS_SETUP_INTR(device_get_parent(dev), child, irq,
			      flags, filter, function, argument, cookiep);
    }
    else {
	struct ata_pci_controller *controller = device_get_softc(dev);
	int unit = ((struct ata_channel *)device_get_softc(child))->unit;

	if (filter != NULL) {
		printf("ata-pci.c: we cannot use a filter here\n");
		return (EINVAL);
	}
	controller->interrupt[unit].function = function;
	controller->interrupt[unit].argument = argument;
	*cookiep = controller;
	return 0;
    }
}

int
ata_pci_teardown_intr(device_t dev, device_t child, struct resource *irq,
		      void *cookie)
{
    if (ata_legacy(dev)) {
	return BUS_TEARDOWN_INTR(device_get_parent(dev), child, irq, cookie);
    }
    else {
	struct ata_pci_controller *controller = device_get_softc(dev);
	int unit = ((struct ata_channel *)device_get_softc(child))->unit;

	controller->interrupt[unit].function = NULL;
	controller->interrupt[unit].argument = NULL;
	return 0;
    }
}
    
static void
ata_generic_setmode(device_t dev, int mode)
{
    struct ata_device *atadev = device_get_softc(dev);

    mode = ata_limit_mode(dev, mode, ATA_UDMA2);
    mode = ata_check_80pin(dev, mode);
    if (!ata_controlcmd(dev, ATA_SETFEATURES, ATA_SF_SETXFER, 0, mode))
	atadev->mode = mode;
}

static int
ata_generic_chipinit(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);

    if (ata_setup_interrupt(dev, ata_generic_intr))
	return ENXIO;
    ctlr->setmode = ata_generic_setmode;
    return 0;
}

int
ata_pci_allocate(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
    struct ata_channel *ch = device_get_softc(dev);
    struct resource *io = NULL, *ctlio = NULL;
    int i, rid;

    rid = ATA_IOADDR_RID;
    if (!(io = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, RF_ACTIVE)))
	return ENXIO;

    rid = ATA_CTLADDR_RID;
    if (!(ctlio = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid,RF_ACTIVE))){
	bus_release_resource(dev, SYS_RES_IOPORT, ATA_IOADDR_RID, io);
	return ENXIO;
    }

    for (i = ATA_DATA; i <= ATA_COMMAND; i ++) {
	ch->r_io[i].res = io;
	ch->r_io[i].offset = i;
    }
    ch->r_io[ATA_CONTROL].res = ctlio;
    ch->r_io[ATA_CONTROL].offset = ata_legacy(device_get_parent(dev)) ? 0 : 2;
    ch->r_io[ATA_IDX_ADDR].res = io;
    ata_default_registers(dev);
    if (ctlr->r_res1) {
	for (i = ATA_BMCMD_PORT; i <= ATA_BMDTP_PORT; i++) {
	    ch->r_io[i].res = ctlr->r_res1;
	    ch->r_io[i].offset = (i - ATA_BMCMD_PORT) + (ch->unit*ATA_BMIOSIZE);
	}
    }

    ata_pci_hw(dev);
    return 0;
}

int
ata_pci_status(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);

    if ((dumping || !ata_legacy(device_get_parent(dev))) &&
	((ch->flags & ATA_ALWAYS_DMASTAT) ||
	 (ch->dma.flags & ATA_DMA_ACTIVE))) {
	int bmstat = ATA_IDX_INB(ch, ATA_BMSTAT_PORT) & ATA_BMSTAT_MASK;

	if ((bmstat & (ATA_BMSTAT_ACTIVE | ATA_BMSTAT_INTERRUPT)) !=
	    ATA_BMSTAT_INTERRUPT)
	    return 0;
	ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, bmstat & ~ATA_BMSTAT_ERROR);
	DELAY(1);
    }
    if (ATA_IDX_INB(ch, ATA_ALTSTAT) & ATA_S_BUSY) {
	DELAY(100);
	if (ATA_IDX_INB(ch, ATA_ALTSTAT) & ATA_S_BUSY)
	    return 0;
    }
    return 1;
}

void
ata_pci_hw(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);

    ata_generic_hw(dev);
    ch->hw.status = ata_pci_status;
}

static int
ata_pci_dmastart(struct ata_request *request)
{
    struct ata_channel *ch = device_get_softc(request->parent);

    ATA_DEBUG_RQ(request, "dmastart");

    ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, (ATA_IDX_INB(ch, ATA_BMSTAT_PORT) | 
		 (ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR)));
    ATA_IDX_OUTL(ch, ATA_BMDTP_PORT, request->dma->sg_bus);
    ch->dma.flags |= ATA_DMA_ACTIVE;
    ATA_IDX_OUTB(ch, ATA_BMCMD_PORT,
		 (ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_WRITE_READ) |
		 ((request->flags & ATA_R_READ) ? ATA_BMCMD_WRITE_READ : 0)|
		 ATA_BMCMD_START_STOP);
    return 0;
}

static int
ata_pci_dmastop(struct ata_request *request)
{
    struct ata_channel *ch = device_get_softc(request->parent);
    int error;

    ATA_DEBUG_RQ(request, "dmastop");

    ATA_IDX_OUTB(ch, ATA_BMCMD_PORT, 
		 ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_START_STOP);
    ch->dma.flags &= ~ATA_DMA_ACTIVE;
    error = ATA_IDX_INB(ch, ATA_BMSTAT_PORT) & ATA_BMSTAT_MASK;
    ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR);
    return error;
}

static void
ata_pci_dmareset(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);
    struct ata_request *request;

    ATA_IDX_OUTB(ch, ATA_BMCMD_PORT, 
		 ATA_IDX_INB(ch, ATA_BMCMD_PORT) & ~ATA_BMCMD_START_STOP);
    ch->dma.flags &= ~ATA_DMA_ACTIVE;
    ATA_IDX_OUTB(ch, ATA_BMSTAT_PORT, ATA_BMSTAT_INTERRUPT | ATA_BMSTAT_ERROR);
    if ((request = ch->running)) {
	device_printf(request->dev, "DMA reset calling unload\n");
	ch->dma.unload(request);
    }
}

void
ata_pci_dmainit(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);

    ata_dmainit(dev);
    ch->dma.start = ata_pci_dmastart;
    ch->dma.stop = ata_pci_dmastop;
    ch->dma.reset = ata_pci_dmareset;
}


static device_method_t ata_pci_methods[] = {
    /* device interface */
    DEVMETHOD(device_probe,             ata_pci_probe),
    DEVMETHOD(device_attach,            ata_pci_attach),
    DEVMETHOD(device_detach,            ata_pci_detach),
    DEVMETHOD(device_suspend,           ata_pci_suspend),
    DEVMETHOD(device_resume,            ata_pci_resume),
    DEVMETHOD(device_shutdown,          bus_generic_shutdown),

    /* bus methods */
    DEVMETHOD(bus_alloc_resource,       ata_pci_alloc_resource),
    DEVMETHOD(bus_release_resource,     ata_pci_release_resource),
    DEVMETHOD(bus_activate_resource,    bus_generic_activate_resource),
    DEVMETHOD(bus_deactivate_resource,  bus_generic_deactivate_resource),
    DEVMETHOD(bus_setup_intr,           ata_pci_setup_intr),
    DEVMETHOD(bus_teardown_intr,        ata_pci_teardown_intr),

    { 0, 0 }
};

devclass_t ata_pci_devclass;

static driver_t ata_pci_driver = {
    "atapci",
    ata_pci_methods,
    sizeof(struct ata_pci_controller),
};

DRIVER_MODULE(atapci, pci, ata_pci_driver, ata_pci_devclass, 0, 0);
MODULE_VERSION(atapci, 1);
MODULE_DEPEND(atapci, ata, 1, 1, 1);

static int
ata_pcichannel_probe(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);
    device_t *children;
    int count, i;
    char buffer[32];

    /* take care of green memory */
    bzero(ch, sizeof(struct ata_channel));

    /* find channel number on this controller */
    device_get_children(device_get_parent(dev), &children, &count);
    for (i = 0; i < count; i++) {
	if (children[i] == dev)
	    ch->unit = i;
    }
    free(children, M_TEMP);

    sprintf(buffer, "ATA channel %d", ch->unit);
    device_set_desc_copy(dev, buffer);

    return ata_probe(dev);
}

static int
ata_pcichannel_attach(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
    int error;

    if (ctlr->dmainit)
	ctlr->dmainit(dev);

    if ((error = ctlr->allocate(dev)))
	return error;

    return ata_attach(dev);
}

static int
ata_pcichannel_detach(device_t dev)
{
    struct ata_channel *ch = device_get_softc(dev);
    int error;

    if ((error = ata_detach(dev)))
	return error;

    ch->dma.free(dev);

    /* XXX SOS free resources for io and ctlio ?? */

    return 0;
}

static int
ata_pcichannel_locking(device_t dev, int mode)
{
    struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
    struct ata_channel *ch = device_get_softc(dev);

    if (ctlr->locking)
	return ctlr->locking(dev, mode);
    else
	return ch->unit;
}

static void
ata_pcichannel_reset(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(device_get_parent(dev));
    struct ata_channel *ch = device_get_softc(dev);

    /* if DMA engine present reset it  */
    if (ch->dma.reset)
	ch->dma.reset(dev);

    /* reset the controller HW */
    if (ctlr->reset)
	ctlr->reset(dev);
    else
	ata_generic_reset(dev);
}

static void
ata_pcichannel_setmode(device_t parent, device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(GRANDPARENT(dev));
    struct ata_device *atadev = device_get_softc(dev);
    int mode = atadev->mode;

    ctlr->setmode(dev, ATA_PIO_MAX);
    if (mode >= ATA_DMA)
	ctlr->setmode(dev, mode);
}

static device_method_t ata_pcichannel_methods[] = {
    /* device interface */
    DEVMETHOD(device_probe,     ata_pcichannel_probe),
    DEVMETHOD(device_attach,    ata_pcichannel_attach),
    DEVMETHOD(device_detach,    ata_pcichannel_detach),
    DEVMETHOD(device_shutdown,  bus_generic_shutdown),
    DEVMETHOD(device_suspend,   ata_suspend),
    DEVMETHOD(device_resume,    ata_resume),

    /* ATA methods */
    DEVMETHOD(ata_setmode,      ata_pcichannel_setmode),
    DEVMETHOD(ata_locking,      ata_pcichannel_locking),
    DEVMETHOD(ata_reset,        ata_pcichannel_reset),

    { 0, 0 }
};

driver_t ata_pcichannel_driver = {
    "ata",
    ata_pcichannel_methods,
    sizeof(struct ata_channel),
};

DRIVER_MODULE(ata, atapci, ata_pcichannel_driver, ata_devclass, 0, 0);


/*
 * misc support fucntions
 */
int
ata_legacy(device_t dev)
{
    return (((pci_read_config(dev, PCIR_PROGIF, 1)&PCIP_STORAGE_IDE_MASTERDEV)&&
	     ((pci_read_config(dev, PCIR_PROGIF, 1) &
	       (PCIP_STORAGE_IDE_MODEPRIM | PCIP_STORAGE_IDE_MODESEC)) !=
	      (PCIP_STORAGE_IDE_MODEPRIM | PCIP_STORAGE_IDE_MODESEC))) ||
	    (!pci_read_config(dev, PCIR_BAR(0), 4) &&
	     !pci_read_config(dev, PCIR_BAR(1), 4) &&
	     !pci_read_config(dev, PCIR_BAR(2), 4) &&
	     !pci_read_config(dev, PCIR_BAR(3), 4) &&
	     !pci_read_config(dev, PCIR_BAR(5), 4)));
}

void
ata_generic_intr(void *data)
{
    struct ata_pci_controller *ctlr = data;
    struct ata_channel *ch;
    int unit;

    for (unit = 0; unit < ctlr->channels; unit++) {
	if ((ch = ctlr->interrupt[unit].argument))
	    ctlr->interrupt[unit].function(ch);
    }
}

int
ata_setup_interrupt(device_t dev, void *intr_func)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    int rid = ATA_IRQ_RID;

    if (!ata_legacy(dev)) {
	if (!(ctlr->r_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
						   RF_SHAREABLE | RF_ACTIVE))) {
	    device_printf(dev, "unable to map interrupt\n");
	    return ENXIO;
	}
	if ((bus_setup_intr(dev, ctlr->r_irq, ATA_INTR_FLAGS, NULL,
			    intr_func, ctlr, &ctlr->handle))) {
	    /* SOS XXX release r_irq */
	    device_printf(dev, "unable to setup interrupt\n");
	    return ENXIO;
	}
    }
    return 0;
}

void
ata_set_desc(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    char buffer[128];

    sprintf(buffer, "%s %s %s controller",
            ata_pcivendor2str(dev), ctlr->chip->text, 
            ata_mode2str(ctlr->chip->max_dma));
    device_set_desc_copy(dev, buffer);
}

struct ata_chip_id *
ata_match_chip(device_t dev, struct ata_chip_id *index)
{
    while (index->chipid != 0) {
	if (pci_get_devid(dev) == index->chipid &&
	    pci_get_revid(dev) >= index->chiprev)
	    return index;
	index++;
    }
    return NULL;
}

struct ata_chip_id *
ata_find_chip(device_t dev, struct ata_chip_id *index, int slot)
{
    device_t *children;
    int nchildren, i;

    if (device_get_children(device_get_parent(dev), &children, &nchildren))
	return 0;

    while (index->chipid != 0) {
	for (i = 0; i < nchildren; i++) {
	    if (((slot >= 0 && pci_get_slot(children[i]) == slot) || 
		 (slot < 0 && pci_get_slot(children[i]) <= -slot)) &&
		pci_get_devid(children[i]) == index->chipid &&
		pci_get_revid(children[i]) >= index->chiprev) {
		free(children, M_TEMP);
		return index;
	    }
	}
	index++;
    }
    free(children, M_TEMP);
    return NULL;
}

void
ata_print_cable(device_t dev, u_int8_t *who)
{
    device_printf(dev,
                  "DMA limited to UDMA33, %s found non-ATA66 cable\n", who);
}

int
ata_check_80pin(device_t dev, int mode)
{
    struct ata_device *atadev = device_get_softc(dev);

    if (!ata_dma_check_80pin) {
        if (bootverbose)
            device_printf(dev, "Skipping 80pin cable check\n");
        return mode;
    }

    if (mode > ATA_UDMA2 && !(atadev->param.hwres & ATA_CABLE_ID)) {
        ata_print_cable(dev, "device");
        mode = ATA_UDMA2;
    }
    return mode;
}

char *
ata_pcivendor2str(device_t dev)
{
    switch (pci_get_vendor(dev)) {
    case ATA_ACARD_ID:          return "Acard";
    case ATA_ACER_LABS_ID:      return "AcerLabs";
    case ATA_AMD_ID:            return "AMD";
    case ATA_ADAPTEC_ID:        return "Adaptec";
    case ATA_ATI_ID:            return "ATI";
    case ATA_CYRIX_ID:          return "Cyrix";
    case ATA_CYPRESS_ID:        return "Cypress";
    case ATA_HIGHPOINT_ID:      return "HighPoint";
    case ATA_INTEL_ID:          return "Intel";
    case ATA_ITE_ID:            return "ITE";
    case ATA_JMICRON_ID:        return "JMicron";
    case ATA_MARVELL_ID:        return "Marvell";
    case ATA_NATIONAL_ID:       return "National";
    case ATA_NETCELL_ID:        return "Netcell";
    case ATA_NVIDIA_ID:         return "nVidia";
    case ATA_PROMISE_ID:        return "Promise";
    case ATA_SERVERWORKS_ID:    return "ServerWorks";
    case ATA_SILICON_IMAGE_ID:  return "SiI";
    case ATA_SIS_ID:            return "SiS";
    case ATA_VIA_ID:            return "VIA";
    case ATA_CENATEK_ID:        return "Cenatek";
    case ATA_MICRON_ID:         return "Micron";
    default:                    return "Generic";
    }
}

int
ata_mode2idx(int mode)
{
    if ((mode & ATA_DMA_MASK) == ATA_UDMA0)
	return (mode & ATA_MODE_MASK) + 8;
    if ((mode & ATA_DMA_MASK) == ATA_WDMA0)
	return (mode & ATA_MODE_MASK) + 5;
    return (mode & ATA_MODE_MASK) - ATA_PIO0;
}