xref: /freebsd-10.1-release/sys/dev/ata/ata-all.c

/*-
 * Copyright (c) 1998,1999 S�ren Schmidt
 * 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.
 * 3. 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 ``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.
 *
 *  $Id: ata-all.c,v 1.13 1999/05/17 15:58:44 sos Exp $
 */

#include "ata.h"
#if NATA > 0
#include "isa.h"
#include "pci.h"
#include "atadisk.h"
#include "opt_global.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/interrupt.h>
#include <sys/conf.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/devicestat.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/resource.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/clock.h>
#ifdef __i386__
#include <machine/smp.h>
#include <i386/isa/intr_machdep.h>
#endif
#if NPCI > 0
#include <pci/pcivar.h>
#include <pci/pcireg.h>
#endif
#include <isa/isavar.h>
#include <isa/isareg.h>
#include <dev/ata/ata-all.h>
#include <dev/ata/ata-disk.h>
#include <dev/ata/atapi-all.h>

/* misc defines */
#define UNIT(dev) (dev>>3 & 0x1f)   		/* assume 8 minor # per unit */
#define MIN(a,b) ((a)>(b)?(b):(a))
#if SMP == 0
#define isa_apic_irq(x)	x
#endif

/* prototypes */
#if NPCI > 0
static void promise_intr(void *);
#endif
static int32_t ata_probe(int32_t, int32_t, int32_t, device_t, int32_t *);
static void ataintr(void *);

static int32_t atanlun = 0;
struct ata_softc *atadevices[MAXATA];
static devclass_t ata_devclass;

#if NISA > 0

static int
ata_isaprobe(device_t dev)
{
    struct resource *port;
    int rid;
    int32_t ctlr, res;
    int32_t lun;

    /* allocate the port range */
    rid = 0;
    port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, RF_ACTIVE);
    if (!port)
	return (ENOMEM);

    /* check if allready in use by a PCI device */
    for (ctlr = 0; ctlr < atanlun; ctlr++) {
	if (atadevices[ctlr]->ioaddr == rman_get_start(port)) {
	    printf("ata-isa%d: already registered as ata%d\n",
		   device_get_unit(dev), ctlr);
	    bus_release_resource(dev, SYS_RES_IOPORT, 0, port);
	    return ENXIO;
	}
    }

    lun = 0;
    res = ata_probe(rman_get_start(port), rman_get_start(port) + ATA_ALTPORT,
		    0, dev, &lun);

    bus_release_resource(dev, SYS_RES_IOPORT, 0, port);

    if (res) {
	isa_set_portsize(dev, res);
	*(int *)device_get_softc(dev) = lun;
	return 0;
    }

    return ENXIO;
}

static int
ata_isaattach(device_t dev)
{
    struct resource *port;
    struct resource *irq;
    void *ih;
    int rid;

    /* Allocate the port range and interrupt */
    rid = 0;
    port = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0, ~0, 1, RF_ACTIVE);
    if (!port)
	return (ENOMEM);

    rid = 0;
    irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1, RF_ACTIVE);
    if (!irq) {
	bus_release_resource(dev, SYS_RES_IOPORT, 0, port);
	return (ENOMEM);
    }
    return bus_setup_intr(dev, irq, INTR_TYPE_BIO, ataintr,
			  atadevices[*(int *)device_get_softc(dev)], &ih);
}

static device_method_t ata_isa_methods[] = {
    /* Device interface */
    DEVMETHOD(device_probe,	ata_isaprobe),
    DEVMETHOD(device_attach,	ata_isaattach),
    { 0, 0 }
};

static driver_t ata_isa_driver = {
    "ata",
    ata_isa_methods,
    sizeof(int),
};

DRIVER_MODULE(ata, isa, ata_isa_driver, ata_devclass, 0, 0);

#endif

#if NPCI > 0

static const char *
ata_pcimatch(device_t dev)
{
    u_int32_t data;

    data = pci_read_config(dev, PCI_CLASS_REG, 4);
    if (pci_get_class(dev) == PCIC_STORAGE &&
	(pci_get_subclass(dev) == PCIS_STORAGE_IDE ||
	 pci_get_subclass(dev) == PCIS_STORAGE_RAID)) {
	switch (pci_get_devid(dev)) {
	case 0x12308086:
	    return "Intel PIIX IDE controller";
	case 0x70108086:
	    return "Intel PIIX3 IDE controller";
	case 0x71118086:
	    return "Intel PIIX4 IDE controller";
	case 0x4d33105a:
	    return "Promise Ultra/33 IDE controller";
	case 0x522910b9:
	    return "AcerLabs Aladdin IDE controller";
#if 0
	case 0x05711106:
	    return "VIA Apollo IDE controller";
	case 0x06401095:
	    return "CMD 640 IDE controller";
	case 0x06461095:
	    return "CMD 646 IDE controller";
	case 0xc6931080:
	    return "Cypress 82C693 IDE controller";
	case 0x01021078:
	    return "Cyrix 5530 IDE controller";
#endif
	default:
	    return "Unknown PCI IDE controller";
	}
    }
    return NULL;
}

static int
ata_pciprobe(device_t dev)
{
    const char *desc = ata_pcimatch(dev);
    if (desc) {
	device_set_desc(dev, desc);
	return 0;
    }
    else
	return ENXIO;
}

static int
ata_pciattach(device_t dev)
{
    int unit = device_get_unit(dev);
    struct ata_softc *scp;
    u_int32_t type;
    u_int8_t class, subclass;
    u_int32_t cmd;
    int32_t iobase_1, iobase_2, altiobase_1, altiobase_2;
    int32_t bmaddr_1 = 0, bmaddr_2 = 0, irq1, irq2;
    int32_t lun;

    /* set up vendor-specific stuff */
    type = pci_get_devid(dev);
    class = pci_get_class(dev);
    subclass = pci_get_subclass(dev);
    cmd = pci_read_config(dev, PCIR_COMMAND, 4);

#ifdef ATA_DEBUG
    printf("ata-pci%d: type=%08x class=%02x subclass=%02x cmd=%08x\n",
	   unit, type, class, subclass, cmd);
#endif

    /* if this is a Promise controller handle it specially */
    if (type == 0x4d33105a) {
	iobase_1 = pci_read_config(dev, 0x10, 4) & 0xfffc;
	altiobase_1 = pci_read_config(dev, 0x14, 4) & 0xfffc;
	iobase_2 = pci_read_config(dev, 0x18, 4) & 0xfffc;
	altiobase_2 = pci_read_config(dev, 0x1c, 4) & 0xfffc;
	irq1 = irq2 = pci_read_config(dev, PCI_INTERRUPT_REG, 4) & 0xff;
    	bmaddr_1 = pci_read_config(dev, 0x20, 4) & 0xfffc;
	bmaddr_2 = bmaddr_1 + ATA_BM_OFFSET1;
	outb(bmaddr_1 + 0x1f, inb(bmaddr_1 + 0x1f) | 0x01);
	printf("ata-pci%d: Busmastering DMA supported\n", unit);
    }
    /* everybody else seems to do it this way */
    else {
	if ((unit == 0) &&
	    (pci_get_progif(dev) & PCIP_STORAGE_IDE_MODEPRIM) == 0) {
		iobase_1 = IO_WD1;
		altiobase_1 = iobase_1 + ATA_ALTPORT;
		irq1 = 14;
	}
	else {
		iobase_1 = pci_read_config(dev, 0x10, 4) & 0xfffc;
		altiobase_1 = pci_read_config(dev, 0x14, 4) & 0xfffc;
		irq1 = pci_read_config(dev, PCI_INTERRUPT_REG, 4) & 0xff;
	}
	if ((unit == 0) &&
	    (pci_get_progif(dev) & PCIP_STORAGE_IDE_MODESEC) == 0) {
		iobase_2 = IO_WD2;
		altiobase_2 = iobase_2 + ATA_ALTPORT;
		irq2 = 15;
	}
	else {
		iobase_2 = pci_read_config(dev, 0x18, 4) & 0xfffc;
		altiobase_2 = pci_read_config(dev, 0x1c, 4) & 0xfffc;
		irq2 = pci_read_config(dev, PCI_INTERRUPT_REG, 4) & 0xff;
	}

        /* is this controller busmaster capable ? */
        if (pci_get_progif(dev) & PCIP_STORAGE_IDE_MASTERDEV) {
	    /* is busmastering support turned on ? */
	    if ((pci_read_config(dev, PCI_COMMAND_STATUS_REG, 4) & 5) == 5) {
	        /* is there a valid port range to connect to ? */
    	        if ((bmaddr_1 = pci_read_config(dev, 0x20, 4) & 0xfffc)) {
		    bmaddr_2 = bmaddr_1 + ATA_BM_OFFSET1;
		    printf("ata-pci%d: Busmastering DMA supported\n", unit);
    	        }
    	        else
		    printf("ata-pci%d: Busmastering DMA not configured\n",unit);
	    }
	    else
	        printf("ata-pci%d: Busmastering DMA not enabled\n", unit);
        }
        else
	    printf("ata-pci%d: Busmastering DMA not supported\n", unit);
    }

    /* now probe the addresse found for "real" ATA/ATAPI hardware */
    lun = 0;
    if (ata_probe(iobase_1, altiobase_1, bmaddr_1, dev, &lun)) {
	scp = atadevices[lun];
	if (iobase_1 == IO_WD1)
#ifdef __i386__
	    inthand_add(device_get_nameunit(dev), irq1, ataintr, scp,
		        &bio_imask, INTR_EXCL);
#endif
#ifdef __alpha__
	    alpha_platform_setup_ide_intr(0, ataintr, scp);
#endif
	else {
	    struct resource *irq;
	    int rid = 0;
	    void *ih;

	    irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
				     RF_SHAREABLE | RF_ACTIVE);
	    if (!irq)
		printf("ata_pciattach: Unable to alloc interrupt\n");

    	    if (type == 0x4d33105a)
		bus_setup_intr(dev, irq, INTR_TYPE_BIO, promise_intr, scp, &ih);
	    else
		bus_setup_intr(dev, irq, INTR_TYPE_BIO, ataintr, scp, &ih);
	}
	printf("ata%d at 0x%04x irq %d on ata-pci%d\n",
	       lun, iobase_1, isa_apic_irq(irq1), unit);
    }
    lun = 1;
    if (ata_probe(iobase_2, altiobase_2, bmaddr_2, dev, &lun)) {
	scp = atadevices[lun];
	if (iobase_2 == IO_WD2)
#ifdef __i386__
	    inthand_add(device_get_nameunit(dev), irq2, ataintr, scp,
		        &bio_imask, INTR_EXCL);
#endif
#ifdef __alpha__
	    alpha_platform_setup_ide_intr(1, ataintr, scp);
#endif
	else {
	    struct resource *irq;
	    int rid = 0;
	    void *ih;

    	    if (type != 0x4d33105a) {
	        irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
					 RF_SHAREABLE | RF_ACTIVE);
	        if (!irq)
		    printf("ata_pciattach: Unable to alloc interrupt\n");

		bus_setup_intr(dev, irq, INTR_TYPE_BIO, ataintr, scp, &ih);
	    }
	}
	printf("ata%d at 0x%04x irq %d on ata-pci%d\n",
	       lun, iobase_2, isa_apic_irq(irq2), unit);
    }
    return 0;
}

static device_method_t ata_pci_methods[] = {
    /* Device interface */
    DEVMETHOD(device_probe,	ata_pciprobe),
    DEVMETHOD(device_attach,	ata_pciattach),
    { 0, 0 }
};

static driver_t ata_pci_driver = {
    "ata-pci",
    ata_pci_methods,
    sizeof(int),
};

DRIVER_MODULE(ata, pci, ata_pci_driver, ata_devclass, 0, 0);

static void
promise_intr(void *data)
{
    struct ata_softc *scp = (struct ata_softc *)data;
    int32_t channel = inl((pci_read_config(scp->dev, 0x20, 4) & 0xfffc) + 0x1c);

    if (channel & 0x00000400)
	ataintr(data);

    if (channel & 0x00004000)
	ataintr(atadevices[scp->lun + 1]);
}
#endif

static int32_t
ata_probe(int32_t ioaddr, int32_t altioaddr, int32_t bmaddr,
	  device_t dev, int32_t *unit)
{
    struct ata_softc *scp = atadevices[atanlun];
    int32_t mask = 0;
    int32_t timeout;
    int32_t lun = atanlun;
    u_int8_t status0, status1;

#ifdef ATA_STATIC_ID
    atanlun++;
#endif
    if (lun > MAXATA) {
	printf("ata: unit out of range(%d)\n", lun);
	return 0;
    }
    if (scp) {
	printf("ata%d: unit already attached\n", lun);
	return 0;
    }
    scp = malloc(sizeof(struct ata_softc), M_DEVBUF, M_NOWAIT);
    if (scp == NULL) {
	printf("ata%d: failed to allocate driver storage\n", lun);
	return 0;
    }
    bzero(scp, sizeof(struct ata_softc));

    scp->unit = *unit;
    scp->lun = lun;
    scp->ioaddr = ioaddr;
    scp->altioaddr = altioaddr;
    scp->active = ATA_IDLE;

#ifdef ATA_DEBUG
    printf("ata%d: iobase=0x%04x altiobase=0x%04x\n",
	   scp->lun, scp->ioaddr, scp->altioaddr);
#endif

    /* do we have any signs of ATA/ATAPI HW being present ? */
    outb(scp->ioaddr + ATA_DRIVE, ATA_D_IBM | ATA_MASTER);
    DELAY(1);
    status0 = inb(scp->ioaddr + ATA_STATUS);
    outb(scp->ioaddr + ATA_DRIVE, ATA_D_IBM | ATA_SLAVE);
    DELAY(1);
    status1 = inb(scp->ioaddr + ATA_STATUS);
    if ((status0 & 0xf8) != 0xf8)
        mask |= 0x01;
    if ((status1 & 0xf8) != 0xf8)
        mask |= 0x02;
#ifdef ATA_DEBUG
    printf("ata%d: mask=%02x status0=%02x status1=%02x\n",
	   scp->lun, mask, status0, status1);
#endif
    if (!mask) {
	free(scp, M_DEVBUF);
        return 0;
    }
    /* assert reset for devices and wait for completition */
    outb(scp->ioaddr + ATA_DRIVE, ATA_D_IBM | ATA_MASTER);
    DELAY(1);
    outb(scp->altioaddr, ATA_A_IDS | ATA_A_RESET);
    DELAY(1000);
    outb(scp->altioaddr, ATA_A_IDS);
    DELAY(1000);
    inb(scp->ioaddr + ATA_ERROR);
    DELAY(1);
    outb(scp->altioaddr, ATA_A_4BIT);
    DELAY(1);

    /* wait for BUSY to go inactive */
    for (timeout = 0; timeout < 30000*10; timeout++) {
        outb(scp->ioaddr + ATA_DRIVE, ATA_D_IBM | ATA_MASTER);
        DELAY(1);
        status0 = inb(scp->ioaddr + ATA_STATUS);
        outb(scp->ioaddr + ATA_DRIVE, ATA_D_IBM | ATA_SLAVE);
        DELAY(1);
        status1 = inb(scp->ioaddr + ATA_STATUS);
        if (mask == 0x01)      /* wait for master only */
            if (!(status0 & ATA_S_BSY))
            	break;
        if (mask == 0x02)      /* wait for slave only */
            if (!(status1 & ATA_S_BSY))
            	break;
        if (mask == 0x03)      /* wait for both master & slave */
            if (!(status0 & ATA_S_BSY) && !(status1 & ATA_S_BSY))
            	break;
        DELAY(100);
    }
    if (status0 & ATA_S_BSY)
        mask &= ~0x01;
    if (status1 & ATA_S_BSY)
        mask &= ~0x02;
#ifdef ATA_DEBUG
    printf("ata%d: mask=%02x status0=%02x status1=%02x\n",
	   scp->lun, mask, status0, status1);
#endif
    if (!mask) {
	free(scp, M_DEVBUF);
        return 0;
    }
    /*
     * OK, we have at least one device on the chain,
     * check for ATAPI signatures, if none check if its
     * a good old ATA device.
     */

    outb(scp->ioaddr + ATA_DRIVE, (ATA_D_IBM | ATA_MASTER));
    DELAY(1);
    if (inb(scp->ioaddr + ATA_CYL_LSB) == ATAPI_MAGIC_LSB &&
	inb(scp->ioaddr + ATA_CYL_MSB) == ATAPI_MAGIC_MSB) {
	scp->devices |= ATA_ATAPI_MASTER;
    }
    outb(scp->ioaddr + ATA_DRIVE, (ATA_D_IBM | ATA_SLAVE));
    DELAY(1);
    if (inb(scp->ioaddr + ATA_CYL_LSB) == ATAPI_MAGIC_LSB &&
	inb(scp->ioaddr + ATA_CYL_MSB) == ATAPI_MAGIC_MSB) {
	scp->devices |= ATA_ATAPI_SLAVE;
    }
    if (status0 != 0x00 && !(scp->devices & ATA_ATAPI_MASTER)) {
    	outb(scp->ioaddr + ATA_DRIVE, (ATA_D_IBM | ATA_MASTER));
        DELAY(1);
        outb(scp->ioaddr + ATA_ERROR, 0x58);
        outb(scp->ioaddr + ATA_CYL_LSB, 0xa5);
        if (inb(scp->ioaddr + ATA_ERROR) != 0x58 &&
	    inb(scp->ioaddr + ATA_CYL_LSB) == 0xa5) {
	    scp->devices |= ATA_ATA_MASTER;
        }
    }
    if (status1 != 0x00 && !(scp->devices & ATA_ATAPI_SLAVE)) {
    	outb(scp->ioaddr + ATA_DRIVE, (ATA_D_IBM | ATA_SLAVE));
        DELAY(1);
        outb(scp->ioaddr + ATA_ERROR, 0x58);
        outb(scp->ioaddr + ATA_CYL_LSB, 0xa5);
        if (inb(scp->ioaddr + ATA_ERROR) != 0x58 &&
            inb(scp->ioaddr + ATA_CYL_LSB) == 0xa5) {
	    scp->devices |= ATA_ATA_SLAVE;
        }
    }
#ifdef ATA_DEBUG
    printf("ata%d: devices = 0x%x\n", scp->lun, scp->devices);
#endif
    if (!scp->devices) {
	free(scp, M_DEVBUF);
	return 0;
    }
    bufq_init(&scp->ata_queue);
    TAILQ_INIT(&scp->atapi_queue);
    *unit = scp->lun;
    scp->dev = dev;
    if (bmaddr)
    	scp->bmaddr = bmaddr;
    atadevices[scp->lun] = scp;
#ifndef ATA_STATIC_ID
    atanlun++;
#endif
    return ATA_IOSIZE;
}

static void
ataintr(void *data)
{
    struct ata_softc *scp;
    struct atapi_request *atapi_request;
    struct buf *ata_request;
    u_int8_t status;
    static int32_t intr_count = 0;

    scp = (struct ata_softc *)data;

    /* find & call the responsible driver to process this interrupt */
    switch (scp->active) {
#if NATADISK > 0
    case ATA_ACTIVE_ATA:
    	if ((ata_request = bufq_first(&scp->ata_queue)))
            if (ad_interrupt(ata_request) == ATA_OP_CONTINUES)
		return;
	break;
#endif
    case ATA_ACTIVE_ATAPI:
        if ((atapi_request = TAILQ_FIRST(&scp->atapi_queue)))
	    if (atapi_interrupt(atapi_request) == ATA_OP_CONTINUES)
		return;
	break;

    case ATA_WAIT_INTR:
	wakeup((caddr_t)scp);
	break;

    case ATA_IGNORE_INTR:
	break;

    default:
    case ATA_IDLE:
        status = inb(scp->ioaddr + ATA_STATUS);
	if (intr_count++ < 10)
	    printf("ata%d: unwanted interrupt %d status = %02x\n",
		   scp->lun, intr_count, status);
	return;
    }
    scp->active = ATA_IDLE;
    ata_start(scp);
}

void
ata_start(struct ata_softc *scp)
{
    struct buf *ata_request;
    struct atapi_request *atapi_request;

#ifdef ATA_DEBUG
    printf("ata_start: entered\n");
#endif
    if (scp->active != ATA_IDLE) {
	printf("ata: unwanted ata_start\n");
	return;
    }

#if NATADISK > 0
    /* find & call the responsible driver if anything on ATA queue */
    if ((ata_request = bufq_first(&scp->ata_queue))) {
	scp->active = ATA_ACTIVE_ATA;
        ad_transfer(ata_request);
#ifdef ATA_DEBUG
        printf("ata_start: started ata, leaving\n");
#endif
	return;
    }
#endif

    /* find & call the responsible driver if anything on ATAPI queue */
    if ((atapi_request = TAILQ_FIRST(&scp->atapi_queue))) {
    	scp->active = ATA_ACTIVE_ATAPI;
	atapi_transfer(atapi_request);
#ifdef ATA_DEBUG
        printf("ata_start: started atapi, leaving\n");
#endif
	return;
    }
}

int32_t
ata_wait(struct ata_softc *scp, int32_t device, u_int8_t mask)
{
    u_int8_t status;
    u_int32_t timeout = 0;

    while (timeout++ <= 500000) {	/* timeout 5 secs */
	status = inb(scp->ioaddr + ATA_STATUS);

	/* if drive fails status, reselect the drive just to be sure */
	if (status == 0xff) {
       	    printf("ata%d: %s: no status, reselecting device\n",
		   scp->lun, device?"slave":"master");
    	    outb(scp->ioaddr + ATA_DRIVE, ATA_D_IBM | device);
	    DELAY(1);
	    status = inb(scp->ioaddr + ATA_STATUS);
	}
	if (status == 0xff)
	    return -1;
	scp->status = status;
	if (!(status & ATA_S_BSY)) {
	    if (status & ATA_S_ERROR)
		scp->error = inb(scp->ioaddr + ATA_ERROR);
	    if ((status & mask) == mask)
		return (status & ATA_S_ERROR);
    	}
	if (timeout > 1000)
	    DELAY(1000);
	else
	    DELAY(10);
    }
    return -1;
}

int32_t
ata_command(struct ata_softc *scp, int32_t device, u_int32_t command,
	   u_int32_t cylinder, u_int32_t head, u_int32_t sector,
	   u_int32_t count, u_int32_t feature, int32_t flags)
{
#ifdef ATA_DEBUG
printf("ata%d: ata_command: addr=%04x, device=%02x, cmd=%02x, c=%d, h=%d, s=%d, count=%d, flags=%02x\n", scp->lun, scp->ioaddr, device, command, cylinder, head, sector, count, flags);
#endif

    /* ready to issue command ? */
    if (ata_wait(scp, device, 0) < 0) {
       	printf("ata%d: %s: timeout waiting to give command s=%02x e=%02x\n",
	       scp->lun, device?"slave":"master", scp->status, scp->error);
    }
    outb(scp->ioaddr + ATA_FEATURE, feature);
    outb(scp->ioaddr + ATA_CYL_LSB, cylinder);
    outb(scp->ioaddr + ATA_CYL_MSB, cylinder >> 8);
    outb(scp->ioaddr + ATA_DRIVE, ATA_D_IBM | device | head);
    outb(scp->ioaddr + ATA_SECTOR, sector);
    outb(scp->ioaddr + ATA_COUNT, count);

    if (scp->active != ATA_IDLE && flags != ATA_IMMEDIATE)
	printf("DANGER active=%d\n", scp->active);

    switch (flags) {
    case ATA_WAIT_INTR:
        scp->active = ATA_WAIT_INTR;
        outb(scp->ioaddr + ATA_CMD, command);
	if (tsleep((caddr_t)scp, PRIBIO, "atacmd", 500)) {
	    printf("ata_command: timeout waiting for interrupt\n");
	    scp->active = ATA_IDLE;
	    return -1;
	}
	break;

    case ATA_IGNORE_INTR:
        scp->active = ATA_IGNORE_INTR;
        outb(scp->ioaddr + ATA_CMD, command);
	break;

    case ATA_IMMEDIATE:
    default:
        outb(scp->ioaddr + ATA_CMD, command);
	break;
    }
#ifdef ATA_DEBUG
printf("ata_command: leaving\n");
#endif
    return 0;
}

void
bswap(int8_t *buf, int32_t len)
{
    u_int16_t *p = (u_int16_t*)(buf + len);

    while (--p >= (u_int16_t*)buf)
        *p = ntohs(*p);
}

void
btrim(int8_t *buf, int32_t len)
{
    int8_t *p;

    for (p = buf; p < buf+len; ++p)
        if (!*p)
            *p = ' ';
    for (p = buf + len - 1; p >= buf && *p == ' '; --p)
        *p = 0;
}

void
bpack(int8_t *src, int8_t *dst, int32_t len)
{
    int32_t i, j, blank;

    for (i = j = blank = 0 ; i < len-1; i++) {
	if (blank && src[i] == ' ') continue;
	if (blank && src[i] != ' ') {
	    dst[j++] = src[i];
	    blank = 0;
	    continue;
	}
	if (src[i] == ' ')
	    blank = 1;
	dst[j++] = src[i];
    }
    dst[j] = 0x00;
}
#endif /* NATA > 0 */