/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2009 Alexander Motin <mav@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/param.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/ata.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/sbuf.h>
#include <sys/sema.h>
#include <sys/stdarg.h>
#include <sys/taskqueue.h>
#include <vm/uma.h>
#include <machine/resource.h>
#include <machine/bus.h>
#include <sys/rman.h>
#include <dev/led/led.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include "siis.h"

#include <cam/cam.h>
#include <cam/cam_ccb.h>
#include <cam/cam_sim.h>
#include <cam/cam_xpt_sim.h>
#include <cam/cam_debug.h>

/* local prototypes */
static int siis_setup_interrupt(device_t dev);
static void siis_intr(void *data);
static int siis_suspend(device_t dev);
static int siis_resume(device_t dev);
static int siis_ch_init(device_t dev);
static int siis_ch_deinit(device_t dev);
static int siis_ch_suspend(device_t dev);
static int siis_ch_resume(device_t dev);
static void siis_ch_intr_locked(void *data);
static void siis_ch_intr(void *data);
static void siis_ch_led(void *priv, int onoff);
static void siis_begin_transaction(device_t dev, union ccb *ccb);
static void siis_dmasetprd(void *arg, bus_dma_segment_t *segs, int nsegs, int error);
static void siis_execute_transaction(struct siis_slot *slot);
static void siis_timeout(void *arg);
static void siis_end_transaction(struct siis_slot *slot, enum siis_err_type et);
static int siis_setup_fis(device_t dev, struct siis_cmd *ctp, union ccb *ccb, int tag);
static void siis_dmainit(device_t dev);
static void siis_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error);
static void siis_dmafini(device_t dev);
static void siis_slotsalloc(device_t dev);
static void siis_slotsfree(device_t dev);
static void siis_reset(device_t dev);
static void siis_portinit(device_t dev);
static int siis_wait_ready(device_t dev, int t);

static int siis_sata_connect(struct siis_channel *ch);

static void siis_issue_recovery(device_t dev);
static void siis_process_read_log(device_t dev, union ccb *ccb);
static void siis_process_request_sense(device_t dev, union ccb *ccb);

static void siisaction(struct cam_sim *sim, union ccb *ccb);
static void siispoll(struct cam_sim *sim);

static MALLOC_DEFINE(M_SIIS, "SIIS driver", "SIIS driver data buffers");

static struct {
        uint32_t        id;
        const char      *name;
        int             ports;
        int             quirks;
#define SIIS_Q_SNTF     1
#define SIIS_Q_NOMSI    2
} siis_ids[] = {
        {0x31241095,    "SiI3124",      4,      0},
        {0x31248086,    "SiI3124",      4,      0},
        {0x31321095,    "SiI3132",      2,      SIIS_Q_SNTF|SIIS_Q_NOMSI},
        {0x02421095,    "SiI3132",      2,      SIIS_Q_SNTF|SIIS_Q_NOMSI},
        {0x02441095,    "SiI3132",      2,      SIIS_Q_SNTF|SIIS_Q_NOMSI},
        {0x31311095,    "SiI3131",      1,      SIIS_Q_SNTF|SIIS_Q_NOMSI},
        {0x35311095,    "SiI3531",      1,      SIIS_Q_SNTF|SIIS_Q_NOMSI},
        {0,             NULL,           0,      0}
};

#define recovery_type           spriv_field0
#define RECOVERY_NONE           0
#define RECOVERY_READ_LOG       1
#define RECOVERY_REQUEST_SENSE  2
#define recovery_slot           spriv_field1

static int
siis_probe(device_t dev)
{
        int i;
        uint32_t devid = pci_get_devid(dev);

        for (i = 0; siis_ids[i].id != 0; i++) {
                if (siis_ids[i].id == devid) {
                        device_set_descf(dev, "%s SATA controller",
                            siis_ids[i].name);
                        return (BUS_PROBE_DEFAULT);
                }
        }
        return (ENXIO);
}

static int
siis_attach(device_t dev)
{
        struct siis_controller *ctlr = device_get_softc(dev);
        uint32_t devid = pci_get_devid(dev);
        device_t child;
        int     error, i, unit;

        ctlr->dev = dev;
        for (i = 0; siis_ids[i].id != 0; i++) {
                if (siis_ids[i].id == devid)
                        break;
        }
        ctlr->quirks = siis_ids[i].quirks;
        /* Global memory */
        ctlr->r_grid = PCIR_BAR(0);
        if (!(ctlr->r_gmem = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
            &ctlr->r_grid, RF_ACTIVE)))
                return (ENXIO);
        ctlr->gctl = ATA_INL(ctlr->r_gmem, SIIS_GCTL);
        /* Channels memory */
        ctlr->r_rid = PCIR_BAR(2);
        if (!(ctlr->r_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
            &ctlr->r_rid, RF_ACTIVE)))
                return (ENXIO);
        /* Setup our own memory management for channels. */
        ctlr->sc_iomem.rm_start = rman_get_start(ctlr->r_mem);
        ctlr->sc_iomem.rm_end = rman_get_end(ctlr->r_mem);
        ctlr->sc_iomem.rm_type = RMAN_ARRAY;
        ctlr->sc_iomem.rm_descr = "I/O memory addresses";
        if ((error = rman_init(&ctlr->sc_iomem)) != 0) {
                bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid, ctlr->r_mem);
                bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_grid, ctlr->r_gmem);
                return (error);
        }
        if ((error = rman_manage_region(&ctlr->sc_iomem,
            rman_get_start(ctlr->r_mem), rman_get_end(ctlr->r_mem))) != 0) {
                bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid, ctlr->r_mem);
                bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_grid, ctlr->r_gmem);
                rman_fini(&ctlr->sc_iomem);
                return (error);
        }
        pci_enable_busmaster(dev);
        /* Reset controller */
        siis_resume(dev);
        /* Number of HW channels */
        ctlr->channels = siis_ids[i].ports;
        /* Setup interrupts. */
        if (siis_setup_interrupt(dev)) {
                bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid, ctlr->r_mem);
                bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_grid, ctlr->r_gmem);
                rman_fini(&ctlr->sc_iomem);
                return ENXIO;
        }
        /* Attach all channels on this controller */
        for (unit = 0; unit < ctlr->channels; unit++) {
                child = device_add_child(dev, "siisch", DEVICE_UNIT_ANY);
                if (child == NULL)
                        device_printf(dev, "failed to add channel device\n");
                else
                        device_set_ivars(child, (void *)(intptr_t)unit);
        }
        bus_attach_children(dev);
        return 0;
}

static int
siis_detach(device_t dev)
{
        struct siis_controller *ctlr = device_get_softc(dev);
        int error;

        /* Detach & delete all children */
        error = bus_generic_detach(dev);
        if (error != 0)
                return (error);

        /* Free interrupts. */
        if (ctlr->irq.r_irq) {
                bus_teardown_intr(dev, ctlr->irq.r_irq,
                    ctlr->irq.handle);
                bus_release_resource(dev, SYS_RES_IRQ,
                    ctlr->irq.r_irq_rid, ctlr->irq.r_irq);
        }
        pci_release_msi(dev);
        /* Free memory. */
        rman_fini(&ctlr->sc_iomem);
        bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_rid, ctlr->r_mem);
        bus_release_resource(dev, SYS_RES_MEMORY, ctlr->r_grid, ctlr->r_gmem);
        return (0);
}

static int
siis_suspend(device_t dev)
{
        struct siis_controller *ctlr = device_get_softc(dev);

        bus_generic_suspend(dev);
        /* Put controller into reset state. */
        ctlr->gctl |= SIIS_GCTL_GRESET;
        ATA_OUTL(ctlr->r_gmem, SIIS_GCTL, ctlr->gctl);
        return 0;
}

static int
siis_resume(device_t dev)
{
        struct siis_controller *ctlr = device_get_softc(dev);

        /* Set PCIe max read request size to at least 1024 bytes */
        if (pci_get_max_read_req(dev) < 1024)
                pci_set_max_read_req(dev, 1024);
        /* Put controller into reset state. */
        ctlr->gctl |= SIIS_GCTL_GRESET;
        ATA_OUTL(ctlr->r_gmem, SIIS_GCTL, ctlr->gctl);
        DELAY(10000);
        /* Get controller out of reset state and enable port interrupts. */
        ctlr->gctl &= ~(SIIS_GCTL_GRESET | SIIS_GCTL_I2C_IE);
        ctlr->gctl |= 0x0000000f;
        ATA_OUTL(ctlr->r_gmem, SIIS_GCTL, ctlr->gctl);
        return (bus_generic_resume(dev));
}

static int
siis_setup_interrupt(device_t dev)
{
        struct siis_controller *ctlr = device_get_softc(dev);
        int msi = ctlr->quirks & SIIS_Q_NOMSI ? 0 : 1;

        /* Process hints. */
        resource_int_value(device_get_name(dev),
            device_get_unit(dev), "msi", &msi);
        if (msi < 0)
                msi = 0;
        else if (msi > 0)
                msi = min(1, pci_msi_count(dev));
        /* Allocate MSI if needed/present. */
        if (msi && pci_alloc_msi(dev, &msi) != 0)
                msi = 0;
        /* Allocate all IRQs. */
        ctlr->irq.r_irq_rid = msi ? 1 : 0;
        if (!(ctlr->irq.r_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
            &ctlr->irq.r_irq_rid, RF_SHAREABLE | RF_ACTIVE))) {
                device_printf(dev, "unable to map interrupt\n");
                return ENXIO;
        }
        if ((bus_setup_intr(dev, ctlr->irq.r_irq, ATA_INTR_FLAGS, NULL,
            siis_intr, ctlr, &ctlr->irq.handle))) {
                /* SOS XXX release r_irq */
                device_printf(dev, "unable to setup interrupt\n");
                return ENXIO;
        }
        return (0);
}

/*
 * Common case interrupt handler.
 */
static void
siis_intr(void *data)
{
        struct siis_controller *ctlr = (struct siis_controller *)data;
        u_int32_t is;
        void *arg;
        int unit;

        is = ATA_INL(ctlr->r_gmem, SIIS_IS);
        for (unit = 0; unit < ctlr->channels; unit++) {
                if ((is & SIIS_IS_PORT(unit)) != 0 &&
                    (arg = ctlr->interrupt[unit].argument)) {
                        ctlr->interrupt[unit].function(arg);
                }
        }
        /* Acknowledge interrupt, if MSI enabled. */
        if (ctlr->irq.r_irq_rid) {
                ATA_OUTL(ctlr->r_gmem, SIIS_GCTL,
                    ctlr->gctl | SIIS_GCTL_MSIACK);
        }
}

static struct resource *
siis_alloc_resource(device_t dev, device_t child, int type, int rid,
                    rman_res_t start, rman_res_t end, rman_res_t count, u_int flags)
{
        struct siis_controller *ctlr = device_get_softc(dev);
        int unit = ((struct siis_channel *)device_get_softc(child))->unit;
        struct resource *res = NULL;
        int offset = unit << 13;
        rman_res_t st;

        switch (type) {
        case SYS_RES_MEMORY:
                st = rman_get_start(ctlr->r_mem);
                res = rman_reserve_resource(&ctlr->sc_iomem, st + offset,
                    st + offset + 0x2000, 0x2000, RF_ACTIVE, child);
                if (res) {
                        bus_space_handle_t bsh;
                        bus_space_tag_t bst;
                        bsh = rman_get_bushandle(ctlr->r_mem);
                        bst = rman_get_bustag(ctlr->r_mem);
                        bus_space_subregion(bst, bsh, offset, 0x2000, &bsh);
                        rman_set_bushandle(res, bsh);
                        rman_set_bustag(res, bst);
                }
                break;
        case SYS_RES_IRQ:
                if (rid == ATA_IRQ_RID)
                        res = ctlr->irq.r_irq;
                break;
        }
        return (res);
}

static int
siis_release_resource(device_t dev, device_t child, struct resource *r)
{

        switch (rman_get_type(r)) {
        case SYS_RES_MEMORY:
                rman_release_resource(r);
                return (0);
        case SYS_RES_IRQ:
                if (rman_get_rid(r) != ATA_IRQ_RID)
                        return ENOENT;
                return (0);
        }
        return (EINVAL);
}

static int
siis_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)
{
        struct siis_controller *ctlr = device_get_softc(dev);
        int unit = (intptr_t)device_get_ivars(child);

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

static int
siis_teardown_intr(device_t dev, device_t child, struct resource *irq,
                      void *cookie)
{
        struct siis_controller *ctlr = device_get_softc(dev);
        int unit = (intptr_t)device_get_ivars(child);

        ctlr->interrupt[unit].function = NULL;
        ctlr->interrupt[unit].argument = NULL;
        return (0);
}

static int
siis_print_child(device_t dev, device_t child)
{
        int retval;

        retval = bus_print_child_header(dev, child);
        retval += printf(" at channel %d",
            (int)(intptr_t)device_get_ivars(child));
        retval += bus_print_child_footer(dev, child);

        return (retval);
}

static int
siis_child_location(device_t dev, device_t child, struct sbuf *sb)
{

        sbuf_printf(sb, "channel=%d",
            (int)(intptr_t)device_get_ivars(child));
        return (0);
}

static bus_dma_tag_t
siis_get_dma_tag(device_t bus, device_t child)
{

        return (bus_get_dma_tag(bus));
}

static device_method_t siis_methods[] = {
        DEVMETHOD(device_probe,     siis_probe),
        DEVMETHOD(device_attach,    siis_attach),
        DEVMETHOD(device_detach,    siis_detach),
        DEVMETHOD(device_suspend,   siis_suspend),
        DEVMETHOD(device_resume,    siis_resume),
        DEVMETHOD(bus_print_child,  siis_print_child),
        DEVMETHOD(bus_alloc_resource,       siis_alloc_resource),
        DEVMETHOD(bus_release_resource,     siis_release_resource),
        DEVMETHOD(bus_setup_intr,   siis_setup_intr),
        DEVMETHOD(bus_teardown_intr,siis_teardown_intr),
        DEVMETHOD(bus_child_location, siis_child_location),
        DEVMETHOD(bus_get_dma_tag,  siis_get_dma_tag),
        DEVMETHOD_END
};

static driver_t siis_driver = {
        "siis",
        siis_methods,
        sizeof(struct siis_controller)
};

DRIVER_MODULE(siis, pci, siis_driver, 0, 0);
MODULE_VERSION(siis, 1);
MODULE_DEPEND(siis, cam, 1, 1, 1);

static int
siis_ch_probe(device_t dev)
{

        device_set_desc(dev, "SIIS channel");
        return (BUS_PROBE_DEFAULT);
}

static int
siis_ch_attach(device_t dev)
{
        struct siis_controller *ctlr = device_get_softc(device_get_parent(dev));
        struct siis_channel *ch = device_get_softc(dev);
        struct cam_devq *devq;
        int rid, error, i, sata_rev = 0;

        ch->dev = dev;
        ch->unit = (intptr_t)device_get_ivars(dev);
        ch->quirks = ctlr->quirks;
        ch->pm_level = 0;
        resource_int_value(device_get_name(dev),
            device_get_unit(dev), "pm_level", &ch->pm_level);
        resource_int_value(device_get_name(dev),
            device_get_unit(dev), "sata_rev", &sata_rev);
        for (i = 0; i < 16; i++) {
                ch->user[i].revision = sata_rev;
                ch->user[i].mode = 0;
                ch->user[i].bytecount = 8192;
                ch->user[i].tags = SIIS_MAX_SLOTS;
                ch->curr[i] = ch->user[i];
                if (ch->pm_level)
                        ch->user[i].caps = CTS_SATA_CAPS_H_PMREQ;
                ch->user[i].caps |= CTS_SATA_CAPS_H_AN;
        }
        mtx_init(&ch->mtx, "SIIS channel lock", NULL, MTX_DEF);
        rid = ch->unit;
        if (!(ch->r_mem = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
            &rid, RF_ACTIVE)))
                return (ENXIO);
        siis_dmainit(dev);
        siis_slotsalloc(dev);
        siis_ch_init(dev);
        mtx_lock(&ch->mtx);
        rid = ATA_IRQ_RID;
        if (!(ch->r_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
            &rid, RF_SHAREABLE | RF_ACTIVE))) {
                device_printf(dev, "Unable to map interrupt\n");
                error = ENXIO;
                goto err0;
        }
        if ((bus_setup_intr(dev, ch->r_irq, ATA_INTR_FLAGS, NULL,
            siis_ch_intr_locked, dev, &ch->ih))) {
                device_printf(dev, "Unable to setup interrupt\n");
                error = ENXIO;
                goto err1;
        }
        /* Create the device queue for our SIM. */
        devq = cam_simq_alloc(SIIS_MAX_SLOTS);
        if (devq == NULL) {
                device_printf(dev, "Unable to allocate simq\n");
                error = ENOMEM;
                goto err1;
        }
        /* Construct SIM entry */
        ch->sim = cam_sim_alloc(siisaction, siispoll, "siisch", ch,
            device_get_unit(dev), &ch->mtx, 2, SIIS_MAX_SLOTS, devq);
        if (ch->sim == NULL) {
                cam_simq_free(devq);
                device_printf(dev, "unable to allocate sim\n");
                error = ENOMEM;
                goto err1;
        }
        if (xpt_bus_register(ch->sim, dev, 0) != CAM_SUCCESS) {
                device_printf(dev, "unable to register xpt bus\n");
                error = ENXIO;
                goto err2;
        }
        if (xpt_create_path(&ch->path, /*periph*/NULL, cam_sim_path(ch->sim),
            CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
                device_printf(dev, "unable to create path\n");
                error = ENXIO;
                goto err3;
        }
        mtx_unlock(&ch->mtx);
        ch->led = led_create(siis_ch_led, dev, device_get_nameunit(dev));
        return (0);

err3:
        xpt_bus_deregister(cam_sim_path(ch->sim));
err2:
        cam_sim_free(ch->sim, /*free_devq*/TRUE);
err1:
        bus_release_resource(dev, SYS_RES_IRQ, ATA_IRQ_RID, ch->r_irq);
err0:
        bus_release_resource(dev, SYS_RES_MEMORY, ch->unit, ch->r_mem);
        mtx_unlock(&ch->mtx);
        mtx_destroy(&ch->mtx);
        return (error);
}

static int
siis_ch_detach(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);

        led_destroy(ch->led);
        mtx_lock(&ch->mtx);
        xpt_async(AC_LOST_DEVICE, ch->path, NULL);
        xpt_free_path(ch->path);
        xpt_bus_deregister(cam_sim_path(ch->sim));
        cam_sim_free(ch->sim, /*free_devq*/TRUE);
        mtx_unlock(&ch->mtx);

        bus_teardown_intr(dev, ch->r_irq, ch->ih);
        bus_release_resource(dev, SYS_RES_IRQ, ATA_IRQ_RID, ch->r_irq);

        siis_ch_deinit(dev);
        siis_slotsfree(dev);
        siis_dmafini(dev);

        bus_release_resource(dev, SYS_RES_MEMORY, ch->unit, ch->r_mem);
        mtx_destroy(&ch->mtx);
        return (0);
}

static int
siis_ch_init(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);

        /* Get port out of reset state. */
        ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_PORT_RESET);
        ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_32BIT);
        if (ch->pm_present)
                ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_PME);
        else
                ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_PME);
        /* Enable port interrupts */
        ATA_OUTL(ch->r_mem, SIIS_P_IESET, SIIS_P_IX_ENABLED);
        return (0);
}

static int
siis_ch_deinit(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);

        /* Put port into reset state. */
        ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_PORT_RESET);
        return (0);
}

static int
siis_ch_suspend(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);

        mtx_lock(&ch->mtx);
        xpt_freeze_simq(ch->sim, 1);
        while (ch->oslots)
                msleep(ch, &ch->mtx, PRIBIO, "siissusp", hz/100);
        siis_ch_deinit(dev);
        mtx_unlock(&ch->mtx);
        return (0);
}

static int
siis_ch_resume(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);

        mtx_lock(&ch->mtx);
        siis_ch_init(dev);
        siis_reset(dev);
        xpt_release_simq(ch->sim, TRUE);
        mtx_unlock(&ch->mtx);
        return (0);
}

static device_method_t siisch_methods[] = {
        DEVMETHOD(device_probe,     siis_ch_probe),
        DEVMETHOD(device_attach,    siis_ch_attach),
        DEVMETHOD(device_detach,    siis_ch_detach),
        DEVMETHOD(device_suspend,   siis_ch_suspend),
        DEVMETHOD(device_resume,    siis_ch_resume),
        DEVMETHOD_END
};

static driver_t siisch_driver = {
        "siisch",
        siisch_methods,
        sizeof(struct siis_channel)
};

DRIVER_MODULE(siisch, siis, siisch_driver, 0, 0);

static void
siis_ch_led(void *priv, int onoff)
{
        device_t dev;
        struct siis_channel *ch;

        dev = (device_t)priv;
        ch = device_get_softc(dev);

        if (onoff == 0)
                ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_LED_ON);
        else
                ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_LED_ON);
}

struct siis_dc_cb_args {
        bus_addr_t maddr;
        int error;
};

static void
siis_dmainit(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        struct siis_dc_cb_args dcba;

        /* Command area. */
        if (bus_dma_tag_create(bus_get_dma_tag(dev), 1024, 0,
            BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
            NULL, NULL, SIIS_WORK_SIZE, 1, SIIS_WORK_SIZE,
            0, NULL, NULL, &ch->dma.work_tag))
                goto error;
        if (bus_dmamem_alloc(ch->dma.work_tag, (void **)&ch->dma.work, 0,
            &ch->dma.work_map))
                goto error;
        if (bus_dmamap_load(ch->dma.work_tag, ch->dma.work_map, ch->dma.work,
            SIIS_WORK_SIZE, siis_dmasetupc_cb, &dcba, 0) || dcba.error) {
                bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
                goto error;
        }
        ch->dma.work_bus = dcba.maddr;
        /* Data area. */
        if (bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
            BUS_SPACE_MAXADDR, BUS_SPACE_MAXADDR,
            NULL, NULL,
            SIIS_SG_ENTRIES * PAGE_SIZE, SIIS_SG_ENTRIES, 0xFFFFFFFF,
            0, busdma_lock_mutex, &ch->mtx, &ch->dma.data_tag)) {
                goto error;
        }
        return;

error:
        device_printf(dev, "WARNING - DMA initialization failed\n");
        siis_dmafini(dev);
}

static void
siis_dmasetupc_cb(void *xsc, bus_dma_segment_t *segs, int nsegs, int error)
{
        struct siis_dc_cb_args *dcba = (struct siis_dc_cb_args *)xsc;

        if (!(dcba->error = error))
                dcba->maddr = segs[0].ds_addr;
}

static void
siis_dmafini(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);

        if (ch->dma.data_tag) {
                bus_dma_tag_destroy(ch->dma.data_tag);
                ch->dma.data_tag = NULL;
        }
        if (ch->dma.work_bus) {
                bus_dmamap_unload(ch->dma.work_tag, ch->dma.work_map);
                bus_dmamem_free(ch->dma.work_tag, ch->dma.work, ch->dma.work_map);
                ch->dma.work_bus = 0;
                ch->dma.work_map = NULL;
                ch->dma.work = NULL;
        }
        if (ch->dma.work_tag) {
                bus_dma_tag_destroy(ch->dma.work_tag);
                ch->dma.work_tag = NULL;
        }
}

static void
siis_slotsalloc(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        int i;

        /* Alloc and setup command/dma slots */
        bzero(ch->slot, sizeof(ch->slot));
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                struct siis_slot *slot = &ch->slot[i];

                slot->dev = dev;
                slot->slot = i;
                slot->state = SIIS_SLOT_EMPTY;
                slot->prb_offset = SIIS_PRB_SIZE * i;
                slot->ccb = NULL;
                callout_init_mtx(&slot->timeout, &ch->mtx, 0);

                if (bus_dmamap_create(ch->dma.data_tag, 0, &slot->dma.data_map))
                        device_printf(ch->dev, "FAILURE - create data_map\n");
        }
}

static void
siis_slotsfree(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        int i;

        /* Free all dma slots */
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                struct siis_slot *slot = &ch->slot[i];

                callout_drain(&slot->timeout);
                if (slot->dma.data_map) {
                        bus_dmamap_destroy(ch->dma.data_tag, slot->dma.data_map);
                        slot->dma.data_map = NULL;
                }
        }
}

static void
siis_notify_events(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        struct cam_path *dpath;
        u_int32_t status;
        int i;

        if (ch->quirks & SIIS_Q_SNTF) {
                status = ATA_INL(ch->r_mem, SIIS_P_SNTF);
                ATA_OUTL(ch->r_mem, SIIS_P_SNTF, status);
        } else {
                /*
                 * Without SNTF we have no idea which device sent notification.
                 * If PMP is connected, assume it, else - device.
                 */
                status = (ch->pm_present) ? 0x8000 : 0x0001;
        }
        if (bootverbose)
                device_printf(dev, "SNTF 0x%04x\n", status);
        for (i = 0; i < 16; i++) {
                if ((status & (1 << i)) == 0)
                        continue;
                if (xpt_create_path(&dpath, NULL,
                    xpt_path_path_id(ch->path), i, 0) == CAM_REQ_CMP) {
                        xpt_async(AC_SCSI_AEN, dpath, NULL);
                        xpt_free_path(dpath);
                }
        }

}

static void
siis_phy_check_events(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);

        /* If we have a connection event, deal with it */
        if (ch->pm_level == 0) {
                u_int32_t status = ATA_INL(ch->r_mem, SIIS_P_SSTS);
                union ccb *ccb;

                if (bootverbose) {
                        if (((status & ATA_SS_DET_MASK) == ATA_SS_DET_PHY_ONLINE) &&
                            ((status & ATA_SS_SPD_MASK) != ATA_SS_SPD_NO_SPEED) &&
                            ((status & ATA_SS_IPM_MASK) == ATA_SS_IPM_ACTIVE)) {
                                device_printf(dev, "CONNECT requested\n");
                        } else
                                device_printf(dev, "DISCONNECT requested\n");
                }
                siis_reset(dev);
                if ((ccb = xpt_alloc_ccb_nowait()) == NULL)
                        return;
                if (xpt_create_path(&ccb->ccb_h.path, NULL,
                    cam_sim_path(ch->sim),
                    CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
                        xpt_free_ccb(ccb);
                        return;
                }
                xpt_rescan(ccb);
        }
}

static void
siis_ch_intr_locked(void *data)
{
        device_t dev = (device_t)data;
        struct siis_channel *ch = device_get_softc(dev);

        mtx_lock(&ch->mtx);
        siis_ch_intr(data);
        mtx_unlock(&ch->mtx);
}

static void
siis_ch_intr(void *data)
{
        device_t dev = (device_t)data;
        struct siis_channel *ch = device_get_softc(dev);
        uint32_t istatus, sstatus, ctx, estatus, ok;
        enum siis_err_type et;
        int i, ccs, port, tslots;

        mtx_assert(&ch->mtx, MA_OWNED);
        /* Read command statuses. */
        sstatus = ATA_INL(ch->r_mem, SIIS_P_SS);
        ok = ch->rslots & ~sstatus;
        /* Complete all successful commands. */
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                if ((ok >> i) & 1)
                        siis_end_transaction(&ch->slot[i], SIIS_ERR_NONE);
        }
        /* Do we have any other events? */
        if ((sstatus & SIIS_P_SS_ATTN) == 0)
                return;
        /* Read and clear interrupt statuses. */
        istatus = ATA_INL(ch->r_mem, SIIS_P_IS) &
            (0xFFFF & ~SIIS_P_IX_COMMCOMP);
        ATA_OUTL(ch->r_mem, SIIS_P_IS, istatus);
        /* Process PHY events */
        if (istatus & SIIS_P_IX_PHYRDYCHG)
                siis_phy_check_events(dev);
        /* Process NOTIFY events */
        if (istatus & SIIS_P_IX_SDBN)
                siis_notify_events(dev);
        /* Process command errors */
        if (istatus & SIIS_P_IX_COMMERR) {
                estatus = ATA_INL(ch->r_mem, SIIS_P_CMDERR);
                ctx = ATA_INL(ch->r_mem, SIIS_P_CTX);
                ccs = (ctx & SIIS_P_CTX_SLOT) >> SIIS_P_CTX_SLOT_SHIFT;
                port = (ctx & SIIS_P_CTX_PMP) >> SIIS_P_CTX_PMP_SHIFT;
//device_printf(dev, "%s ERROR ss %08x is %08x rs %08x es %d act %d port %d serr %08x\n",
//    __func__, sstatus, istatus, ch->rslots, estatus, ccs, port,
//    ATA_INL(ch->r_mem, SIIS_P_SERR));

                if (!ch->recoverycmd && !ch->recovery) {
                        xpt_freeze_simq(ch->sim, ch->numrslots);
                        ch->recovery = 1;
                }
                if (ch->frozen) {
                        union ccb *fccb = ch->frozen;
                        ch->frozen = NULL;
                        fccb->ccb_h.status &= ~CAM_STATUS_MASK;
                        fccb->ccb_h.status |= CAM_REQUEUE_REQ | CAM_RELEASE_SIMQ;
                        if (!(fccb->ccb_h.status & CAM_DEV_QFRZN)) {
                                xpt_freeze_devq(fccb->ccb_h.path, 1);
                                fccb->ccb_h.status |= CAM_DEV_QFRZN;
                        }
                        xpt_done(fccb);
                }
                if (estatus == SIIS_P_CMDERR_DEV ||
                    estatus == SIIS_P_CMDERR_SDB ||
                    estatus == SIIS_P_CMDERR_DATAFIS) {
                        tslots = ch->numtslots[port];
                        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                                /* XXX: requests in loading state. */
                                if (((ch->rslots >> i) & 1) == 0)
                                        continue;
                                if (ch->slot[i].ccb->ccb_h.target_id != port)
                                        continue;
                                if (tslots == 0) {
                                        /* Untagged operation. */
                                        if (i == ccs)
                                                et = SIIS_ERR_TFE;
                                        else
                                                et = SIIS_ERR_INNOCENT;
                                } else {
                                        /* Tagged operation. */
                                        et = SIIS_ERR_NCQ;
                                }
                                siis_end_transaction(&ch->slot[i], et);
                        }
                        /*
                         * We can't reinit port if there are some other
                         * commands active, use resume to complete them.
                         */
                        if (ch->rslots != 0 && !ch->recoverycmd)
                                ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_RESUME);
                } else {
                        if (estatus == SIIS_P_CMDERR_SENDFIS ||
                            estatus == SIIS_P_CMDERR_INCSTATE ||
                            estatus == SIIS_P_CMDERR_PPE ||
                            estatus == SIIS_P_CMDERR_SERVICE) {
                                et = SIIS_ERR_SATA;
                        } else
                                et = SIIS_ERR_INVALID;
                        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                                /* XXX: requests in loading state. */
                                if (((ch->rslots >> i) & 1) == 0)
                                        continue;
                                siis_end_transaction(&ch->slot[i], et);
                        }
                }
        }
}

/* Must be called with channel locked. */
static int
siis_check_collision(device_t dev, union ccb *ccb)
{
        struct siis_channel *ch = device_get_softc(dev);

        mtx_assert(&ch->mtx, MA_OWNED);
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA)) {
                /* Tagged command while we have no supported tag free. */
                if (((~ch->oslots) & (0x7fffffff >> (31 -
                    ch->curr[ccb->ccb_h.target_id].tags))) == 0)
                        return (1);
        }
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & (CAM_ATAIO_CONTROL | CAM_ATAIO_NEEDRESULT))) {
                /* Atomic command while anything active. */
                if (ch->numrslots != 0)
                        return (1);
        }
       /* We have some atomic command running. */
       if (ch->aslots != 0)
               return (1);
        return (0);
}

/* Must be called with channel locked. */
static void
siis_begin_transaction(device_t dev, union ccb *ccb)
{
        struct siis_channel *ch = device_get_softc(dev);
        struct siis_slot *slot;
        int tag, tags;

        mtx_assert(&ch->mtx, MA_OWNED);
        /* Choose empty slot. */
        tags = SIIS_MAX_SLOTS;
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA))
                tags = ch->curr[ccb->ccb_h.target_id].tags;
        tag = fls((~ch->oslots) & (0x7fffffff >> (31 - tags))) - 1;
        /* Occupy chosen slot. */
        slot = &ch->slot[tag];
        slot->ccb = ccb;
        /* Update channel stats. */
        ch->oslots |= (1 << slot->slot);
        ch->numrslots++;
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA)) {
                ch->numtslots[ccb->ccb_h.target_id]++;
        }
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & (CAM_ATAIO_CONTROL | CAM_ATAIO_NEEDRESULT)))
                ch->aslots |= (1 << slot->slot);
        slot->dma.nsegs = 0;
        /* If request moves data, setup and load SG list */
        if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
                slot->state = SIIS_SLOT_LOADING;
                bus_dmamap_load_ccb(ch->dma.data_tag, slot->dma.data_map,
                    ccb, siis_dmasetprd, slot, 0);
        } else
                siis_execute_transaction(slot);
}

/* Locked by busdma engine. */
static void
siis_dmasetprd(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{    
        struct siis_slot *slot = arg;
        struct siis_channel *ch = device_get_softc(slot->dev);
        struct siis_cmd *ctp;
        struct siis_dma_prd *prd;
        int i;

        mtx_assert(&ch->mtx, MA_OWNED);
        if (error) {
                device_printf(slot->dev, "DMA load error\n");
                if (!ch->recoverycmd)
                        xpt_freeze_simq(ch->sim, 1);
                siis_end_transaction(slot, SIIS_ERR_INVALID);
                return;
        }
        KASSERT(nsegs <= SIIS_SG_ENTRIES, ("too many DMA segment entries\n"));
        slot->dma.nsegs = nsegs;
        if (nsegs != 0) {
                /* Get a piece of the workspace for this request */
                ctp = (struct siis_cmd *)(ch->dma.work + slot->prb_offset);
                /* Fill S/G table */
                if (slot->ccb->ccb_h.func_code == XPT_ATA_IO) 
                        prd = &ctp->u.ata.prd[0];
                else
                        prd = &ctp->u.atapi.prd[0];
                for (i = 0; i < nsegs; i++) {
                        prd[i].dba = htole64(segs[i].ds_addr);
                        prd[i].dbc = htole32(segs[i].ds_len);
                        prd[i].control = 0;
                }
                        prd[nsegs - 1].control = htole32(SIIS_PRD_TRM);
                bus_dmamap_sync(ch->dma.data_tag, slot->dma.data_map,
                    ((slot->ccb->ccb_h.flags & CAM_DIR_IN) ?
                    BUS_DMASYNC_PREREAD : BUS_DMASYNC_PREWRITE));
        }
        siis_execute_transaction(slot);
}

/* Must be called with channel locked. */
static void
siis_execute_transaction(struct siis_slot *slot)
{
        device_t dev = slot->dev;
        struct siis_channel *ch = device_get_softc(dev);
        struct siis_cmd *ctp;
        union ccb *ccb = slot->ccb;
        u_int64_t prb_bus;

        mtx_assert(&ch->mtx, MA_OWNED);
        /* Get a piece of the workspace for this request */
        ctp = (struct siis_cmd *)(ch->dma.work + slot->prb_offset);
        ctp->control = 0;
        ctp->protocol_override = 0;
        ctp->transfer_count = 0;
        /* Special handling for Soft Reset command. */
        if (ccb->ccb_h.func_code == XPT_ATA_IO) {
                if (ccb->ataio.cmd.flags & CAM_ATAIO_CONTROL) {
                        ctp->control |= htole16(SIIS_PRB_SOFT_RESET);
                } else {
                        ctp->control |= htole16(SIIS_PRB_PROTOCOL_OVERRIDE);
                        if (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA) {
                                ctp->protocol_override |=
                                    htole16(SIIS_PRB_PROTO_NCQ);
                        }
                        if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) {
                                ctp->protocol_override |=
                                    htole16(SIIS_PRB_PROTO_READ);
                        } else
                        if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT) {
                                ctp->protocol_override |=
                                    htole16(SIIS_PRB_PROTO_WRITE);
                        }
                }
        } else if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
                if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN)
                        ctp->control |= htole16(SIIS_PRB_PACKET_READ);
                else
                if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_OUT)
                        ctp->control |= htole16(SIIS_PRB_PACKET_WRITE);
        }
        /* Special handling for Soft Reset command. */
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & CAM_ATAIO_CONTROL) &&
            (ccb->ataio.cmd.control & ATA_A_RESET)) {
                /* Kick controller into sane state */
                siis_portinit(dev);
        }
        /* Setup the FIS for this request */
        if (!siis_setup_fis(dev, ctp, ccb, slot->slot)) {
                device_printf(ch->dev, "Setting up SATA FIS failed\n");
                if (!ch->recoverycmd)
                        xpt_freeze_simq(ch->sim, 1);
                siis_end_transaction(slot, SIIS_ERR_INVALID);
                return;
        }
        bus_dmamap_sync(ch->dma.work_tag, ch->dma.work_map,
            BUS_DMASYNC_PREWRITE);
        /* Issue command to the controller. */
        slot->state = SIIS_SLOT_RUNNING;
        ch->rslots |= (1 << slot->slot);
        prb_bus = ch->dma.work_bus + slot->prb_offset;
        ATA_OUTL(ch->r_mem, SIIS_P_CACTL(slot->slot), prb_bus);
        ATA_OUTL(ch->r_mem, SIIS_P_CACTH(slot->slot), prb_bus >> 32);
        /* Start command execution timeout */
        callout_reset_sbt(&slot->timeout, SBT_1MS * ccb->ccb_h.timeout, 0,
            siis_timeout, slot, 0);
        return;
}

/* Must be called with channel locked. */
static void
siis_process_timeout(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        int i;

        mtx_assert(&ch->mtx, MA_OWNED);
        if (!ch->recoverycmd && !ch->recovery) {
                xpt_freeze_simq(ch->sim, ch->numrslots);
                ch->recovery = 1;
        }
        /* Handle the rest of commands. */
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                /* Do we have a running request on slot? */
                if (ch->slot[i].state < SIIS_SLOT_RUNNING)
                        continue;
                siis_end_transaction(&ch->slot[i], SIIS_ERR_TIMEOUT);
        }
}

/* Must be called with channel locked. */
static void
siis_rearm_timeout(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        int i;

        mtx_assert(&ch->mtx, MA_OWNED);
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                struct siis_slot *slot = &ch->slot[i];

                /* Do we have a running request on slot? */
                if (slot->state < SIIS_SLOT_RUNNING)
                        continue;
                if ((ch->toslots & (1 << i)) == 0)
                        continue;
                callout_reset_sbt(&slot->timeout,
                    SBT_1MS * slot->ccb->ccb_h.timeout, 0,
                    siis_timeout, slot, 0);
        }
}

/* Locked by callout mechanism. */
static void
siis_timeout(void *arg)
{
        struct siis_slot *slot = arg;
        device_t dev = slot->dev;
        struct siis_channel *ch = device_get_softc(dev);
        union ccb *ccb = slot->ccb;

        mtx_assert(&ch->mtx, MA_OWNED);
        /* Check for stale timeout. */
        if (slot->state < SIIS_SLOT_RUNNING)
                return;

        /* Handle soft-reset timeouts without doing hard-reset. */
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & CAM_ATAIO_CONTROL) &&
            (ccb->ataio.cmd.control & ATA_A_RESET)) {
                xpt_freeze_simq(ch->sim, ch->numrslots);
                siis_end_transaction(slot, SIIS_ERR_TFE);
                return;
        }

        device_printf(dev, "Timeout on slot %d\n", slot->slot);
        device_printf(dev, "%s is %08x ss %08x rs %08x es %08x sts %08x serr %08x\n",
            __func__, ATA_INL(ch->r_mem, SIIS_P_IS),
            ATA_INL(ch->r_mem, SIIS_P_SS), ch->rslots,
            ATA_INL(ch->r_mem, SIIS_P_CMDERR), ATA_INL(ch->r_mem, SIIS_P_STS),
            ATA_INL(ch->r_mem, SIIS_P_SERR));

        if (ch->toslots == 0)
                xpt_freeze_simq(ch->sim, 1);
        ch->toslots |= (1 << slot->slot);
        if ((ch->rslots & ~ch->toslots) == 0)
                siis_process_timeout(dev);
        else
                device_printf(dev, " ... waiting for slots %08x\n",
                    ch->rslots & ~ch->toslots);
}

/* Must be called with channel locked. */
static void
siis_end_transaction(struct siis_slot *slot, enum siis_err_type et)
{
        device_t dev = slot->dev;
        struct siis_channel *ch = device_get_softc(dev);
        union ccb *ccb = slot->ccb;
        int lastto;

        mtx_assert(&ch->mtx, MA_OWNED);
        bus_dmamap_sync(ch->dma.work_tag, ch->dma.work_map,
            BUS_DMASYNC_POSTWRITE);
        /* Read result registers to the result struct
         * May be incorrect if several commands finished same time,
         * so read only when sure or have to.
         */
        if (ccb->ccb_h.func_code == XPT_ATA_IO) {
                struct ata_res *res = &ccb->ataio.res;
                if ((et == SIIS_ERR_TFE) ||
                    (ccb->ataio.cmd.flags & CAM_ATAIO_NEEDRESULT)) {
                        int offs = SIIS_P_LRAM_SLOT(slot->slot) + 8;

                        res->status = ATA_INB(ch->r_mem, offs + 2);
                        res->error = ATA_INB(ch->r_mem, offs + 3);
                        res->lba_low = ATA_INB(ch->r_mem, offs + 4);
                        res->lba_mid = ATA_INB(ch->r_mem, offs + 5);
                        res->lba_high = ATA_INB(ch->r_mem, offs + 6);
                        res->device = ATA_INB(ch->r_mem, offs + 7);
                        res->lba_low_exp = ATA_INB(ch->r_mem, offs + 8);
                        res->lba_mid_exp = ATA_INB(ch->r_mem, offs + 9);
                        res->lba_high_exp = ATA_INB(ch->r_mem, offs + 10);
                        res->sector_count = ATA_INB(ch->r_mem, offs + 12);
                        res->sector_count_exp = ATA_INB(ch->r_mem, offs + 13);
                } else
                        bzero(res, sizeof(*res));
                if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN &&
                    ch->numrslots == 1) {
                        ccb->ataio.resid = ccb->ataio.dxfer_len -
                            ATA_INL(ch->r_mem, SIIS_P_LRAM_SLOT(slot->slot) + 4);
                }
        } else {
                if ((ccb->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN &&
                    ch->numrslots == 1) {
                        ccb->csio.resid = ccb->csio.dxfer_len -
                            ATA_INL(ch->r_mem, SIIS_P_LRAM_SLOT(slot->slot) + 4);
                }
        }
        if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
                bus_dmamap_sync(ch->dma.data_tag, slot->dma.data_map,
                    (ccb->ccb_h.flags & CAM_DIR_IN) ?
                    BUS_DMASYNC_POSTREAD : BUS_DMASYNC_POSTWRITE);
                bus_dmamap_unload(ch->dma.data_tag, slot->dma.data_map);
        }
        /* Set proper result status. */
        if (et != SIIS_ERR_NONE || ch->recovery) {
                ch->eslots |= (1 << slot->slot);
                ccb->ccb_h.status |= CAM_RELEASE_SIMQ;
        }
        /* In case of error, freeze device for proper recovery. */
        if (et != SIIS_ERR_NONE && (!ch->recoverycmd) &&
            !(ccb->ccb_h.status & CAM_DEV_QFRZN)) {
                xpt_freeze_devq(ccb->ccb_h.path, 1);
                ccb->ccb_h.status |= CAM_DEV_QFRZN;
        }
        ccb->ccb_h.status &= ~CAM_STATUS_MASK;
        switch (et) {
        case SIIS_ERR_NONE:
                ccb->ccb_h.status |= CAM_REQ_CMP;
                if (ccb->ccb_h.func_code == XPT_SCSI_IO)
                        ccb->csio.scsi_status = SCSI_STATUS_OK;
                break;
        case SIIS_ERR_INVALID:
                ch->fatalerr = 1;
                ccb->ccb_h.status |= CAM_REQ_INVALID;
                break;
        case SIIS_ERR_INNOCENT:
                ccb->ccb_h.status |= CAM_REQUEUE_REQ;
                break;
        case SIIS_ERR_TFE:
        case SIIS_ERR_NCQ:
                if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
                        ccb->ccb_h.status |= CAM_SCSI_STATUS_ERROR;
                        ccb->csio.scsi_status = SCSI_STATUS_CHECK_COND;
                } else {
                        ccb->ccb_h.status |= CAM_ATA_STATUS_ERROR;
                }
                break;
        case SIIS_ERR_SATA:
                ch->fatalerr = 1;
                ccb->ccb_h.status |= CAM_UNCOR_PARITY;
                break;
        case SIIS_ERR_TIMEOUT:
                ch->fatalerr = 1;
                ccb->ccb_h.status |= CAM_CMD_TIMEOUT;
                break;
        default:
                ccb->ccb_h.status |= CAM_REQ_CMP_ERR;
        }
        /* Free slot. */
        ch->oslots &= ~(1 << slot->slot);
        ch->rslots &= ~(1 << slot->slot);
        ch->aslots &= ~(1 << slot->slot);
        slot->state = SIIS_SLOT_EMPTY;
        slot->ccb = NULL;
        /* Update channel stats. */
        ch->numrslots--;
        if ((ccb->ccb_h.func_code == XPT_ATA_IO) &&
            (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA)) {
                ch->numtslots[ccb->ccb_h.target_id]--;
        }
        /* Cancel timeout state if request completed normally. */
        if (et != SIIS_ERR_TIMEOUT) {
                lastto = (ch->toslots == (1 << slot->slot));
                ch->toslots &= ~(1 << slot->slot);
                if (lastto)
                        xpt_release_simq(ch->sim, TRUE);
        }
        /* If it was our READ LOG command - process it. */
        if (ccb->ccb_h.recovery_type == RECOVERY_READ_LOG) {
                siis_process_read_log(dev, ccb);
        /* If it was our REQUEST SENSE command - process it. */
        } else if (ccb->ccb_h.recovery_type == RECOVERY_REQUEST_SENSE) {
                siis_process_request_sense(dev, ccb);
        /* If it was NCQ or ATAPI command error, put result on hold. */
        } else if (et == SIIS_ERR_NCQ ||
            ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_SCSI_STATUS_ERROR &&
             (ccb->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0)) {
                ch->hold[slot->slot] = ccb;
                ch->numhslots++;
        } else
                xpt_done(ccb);
        /* If we have no other active commands, ... */
        if (ch->rslots == 0) {
                /* if there were timeouts or fatal error - reset port. */
                if (ch->toslots != 0 || ch->fatalerr) {
                        siis_reset(dev);
                } else {
                        /* if we have slots in error, we can reinit port. */
                        if (ch->eslots != 0)
                                siis_portinit(dev);
                        /* if there commands on hold, we can do recovery. */
                        if (!ch->recoverycmd && ch->numhslots)
                                siis_issue_recovery(dev);
                }
        /* If all the reset of commands are in timeout - abort them. */
        } else if ((ch->rslots & ~ch->toslots) == 0 &&
            et != SIIS_ERR_TIMEOUT)
                siis_rearm_timeout(dev);
        /* Unfreeze frozen command. */
        if (ch->frozen && !siis_check_collision(dev, ch->frozen)) {
                union ccb *fccb = ch->frozen;
                ch->frozen = NULL;
                siis_begin_transaction(dev, fccb);
                xpt_release_simq(ch->sim, TRUE);
        }
}

static void
siis_issue_recovery(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        union ccb *ccb;
        struct ccb_ataio *ataio;
        struct ccb_scsiio *csio;
        int i;

        /* Find some held command. */
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                if (ch->hold[i])
                        break;
        }
        if (i == SIIS_MAX_SLOTS)
                return;
        ccb = xpt_alloc_ccb_nowait();
        if (ccb == NULL) {
                device_printf(dev, "Unable to allocate recovery command\n");
completeall:
                /* We can't do anything -- complete held commands. */
                for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                        if (ch->hold[i] == NULL)
                                continue;
                        ch->hold[i]->ccb_h.status &= ~CAM_STATUS_MASK;
                        ch->hold[i]->ccb_h.status |= CAM_RESRC_UNAVAIL;
                        xpt_done(ch->hold[i]);
                        ch->hold[i] = NULL;
                        ch->numhslots--;
                }
                siis_reset(dev);
                return;
        }
        xpt_setup_ccb(&ccb->ccb_h, ch->hold[i]->ccb_h.path,
            ch->hold[i]->ccb_h.pinfo.priority);
        if (ch->hold[i]->ccb_h.func_code == XPT_ATA_IO) {
                /* READ LOG */
                ccb->ccb_h.recovery_type = RECOVERY_READ_LOG;
                ccb->ccb_h.func_code = XPT_ATA_IO;
                ccb->ccb_h.flags = CAM_DIR_IN;
                ccb->ccb_h.timeout = 1000;      /* 1s should be enough. */
                ataio = &ccb->ataio;
                ataio->data_ptr = malloc(512, M_SIIS, M_NOWAIT);
                if (ataio->data_ptr == NULL) {
                        xpt_free_ccb(ccb);
                        device_printf(dev,
                            "Unable to allocate memory for READ LOG command\n");
                        goto completeall;
                }
                ataio->dxfer_len = 512;
                bzero(&ataio->cmd, sizeof(ataio->cmd));
                ataio->cmd.flags = CAM_ATAIO_48BIT;
                ataio->cmd.command = 0x2F;      /* READ LOG EXT */
                ataio->cmd.sector_count = 1;
                ataio->cmd.sector_count_exp = 0;
                ataio->cmd.lba_low = 0x10;
                ataio->cmd.lba_mid = 0;
                ataio->cmd.lba_mid_exp = 0;
        } else {
                /* REQUEST SENSE */
                ccb->ccb_h.recovery_type = RECOVERY_REQUEST_SENSE;
                ccb->ccb_h.recovery_slot = i;
                ccb->ccb_h.func_code = XPT_SCSI_IO;
                ccb->ccb_h.flags = CAM_DIR_IN;
                ccb->ccb_h.status = 0;
                ccb->ccb_h.timeout = 1000;      /* 1s should be enough. */
                csio = &ccb->csio;
                csio->data_ptr = (void *)&ch->hold[i]->csio.sense_data;
                csio->dxfer_len = ch->hold[i]->csio.sense_len;
                csio->cdb_len = 6;
                bzero(&csio->cdb_io, sizeof(csio->cdb_io));
                csio->cdb_io.cdb_bytes[0] = 0x03;
                csio->cdb_io.cdb_bytes[4] = csio->dxfer_len;
        }
        ch->recoverycmd = 1;
        siis_begin_transaction(dev, ccb);
}

static void
siis_process_read_log(device_t dev, union ccb *ccb)
{
        struct siis_channel *ch = device_get_softc(dev);
        uint8_t *data;
        struct ata_res *res;
        int i;

        ch->recoverycmd = 0;
        data = ccb->ataio.data_ptr;
        if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP &&
            (data[0] & 0x80) == 0) {
                for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                        if (!ch->hold[i])
                                continue;
                        if (ch->hold[i]->ccb_h.target_id != ccb->ccb_h.target_id)
                                continue;
                        if ((data[0] & 0x1F) == i) {
                                res = &ch->hold[i]->ataio.res;
                                res->status = data[2];
                                res->error = data[3];
                                res->lba_low = data[4];
                                res->lba_mid = data[5];
                                res->lba_high = data[6];
                                res->device = data[7];
                                res->lba_low_exp = data[8];
                                res->lba_mid_exp = data[9];
                                res->lba_high_exp = data[10];
                                res->sector_count = data[12];
                                res->sector_count_exp = data[13];
                        } else {
                                ch->hold[i]->ccb_h.status &= ~CAM_STATUS_MASK;
                                ch->hold[i]->ccb_h.status |= CAM_REQUEUE_REQ;
                        }
                        xpt_done(ch->hold[i]);
                        ch->hold[i] = NULL;
                        ch->numhslots--;
                }
        } else {
                if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP)
                        device_printf(dev, "Error while READ LOG EXT\n");
                else if ((data[0] & 0x80) == 0) {
                        device_printf(dev, "Non-queued command error in READ LOG EXT\n");
                }
                for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                        if (!ch->hold[i])
                                continue;
                        if (ch->hold[i]->ccb_h.target_id != ccb->ccb_h.target_id)
                                continue;
                        xpt_done(ch->hold[i]);
                        ch->hold[i] = NULL;
                        ch->numhslots--;
                }
        }
        free(ccb->ataio.data_ptr, M_SIIS);
        xpt_free_ccb(ccb);
}

static void
siis_process_request_sense(device_t dev, union ccb *ccb)
{
        struct siis_channel *ch = device_get_softc(dev);
        int i;

        ch->recoverycmd = 0;

        i = ccb->ccb_h.recovery_slot;
        if ((ccb->ccb_h.status & CAM_STATUS_MASK) == CAM_REQ_CMP) {
                ch->hold[i]->ccb_h.status |= CAM_AUTOSNS_VALID;
        } else {
                ch->hold[i]->ccb_h.status &= ~CAM_STATUS_MASK;
                ch->hold[i]->ccb_h.status |= CAM_AUTOSENSE_FAIL;
        }
        xpt_done(ch->hold[i]);
        ch->hold[i] = NULL;
        ch->numhslots--;
        xpt_free_ccb(ccb);
}

static void
siis_portinit(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        int i;

        ch->eslots = 0;
        ch->recovery = 0;
        ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_RESUME);
        for (i = 0; i < 16; i++) {
                ATA_OUTL(ch->r_mem, SIIS_P_PMPSTS(i), 0),
                ATA_OUTL(ch->r_mem, SIIS_P_PMPQACT(i), 0);
        }
        ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_PORT_INIT);
        siis_wait_ready(dev, 1000);
}

static int
siis_devreset(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        int timeout = 0;
        uint32_t val;

        ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_DEV_RESET);
        while (((val = ATA_INL(ch->r_mem, SIIS_P_STS)) &
            SIIS_P_CTL_DEV_RESET) != 0) {
                DELAY(100);
                if (timeout++ > 1000) {
                        device_printf(dev, "device reset stuck "
                            "(timeout 100ms) status = %08x\n", val);
                        return (EBUSY);
                }
        }
        return (0);
}

static int
siis_wait_ready(device_t dev, int t)
{
        struct siis_channel *ch = device_get_softc(dev);
        int timeout = 0;
        uint32_t val;

        while (((val = ATA_INL(ch->r_mem, SIIS_P_STS)) &
            SIIS_P_CTL_READY) == 0) {
                DELAY(1000);
                if (timeout++ > t) {
                        device_printf(dev, "port is not ready (timeout %dms) "
                            "status = %08x\n", t, val);
                        return (EBUSY);
                }
        }
        return (0);
}

static void
siis_reset(device_t dev)
{
        struct siis_channel *ch = device_get_softc(dev);
        int i, retry = 0, sata_rev;
        uint32_t val;

        xpt_freeze_simq(ch->sim, 1);
        if (bootverbose)
                device_printf(dev, "SIIS reset...\n");
        if (!ch->recoverycmd && !ch->recovery)
                xpt_freeze_simq(ch->sim, ch->numrslots);
        /* Requeue frozen command. */
        if (ch->frozen) {
                union ccb *fccb = ch->frozen;
                ch->frozen = NULL;
                fccb->ccb_h.status &= ~CAM_STATUS_MASK;
                fccb->ccb_h.status |= CAM_REQUEUE_REQ | CAM_RELEASE_SIMQ;
                if (!(fccb->ccb_h.status & CAM_DEV_QFRZN)) {
                        xpt_freeze_devq(fccb->ccb_h.path, 1);
                        fccb->ccb_h.status |= CAM_DEV_QFRZN;
                }
                xpt_done(fccb);
        }
        /* Requeue all running commands. */
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                /* Do we have a running request on slot? */
                if (ch->slot[i].state < SIIS_SLOT_RUNNING)
                        continue;
                /* XXX; Commands in loading state. */
                siis_end_transaction(&ch->slot[i], SIIS_ERR_INNOCENT);
        }
        /* Finish all held commands as-is. */
        for (i = 0; i < SIIS_MAX_SLOTS; i++) {
                if (!ch->hold[i])
                        continue;
                xpt_done(ch->hold[i]);
                ch->hold[i] = NULL;
                ch->numhslots--;
        }
        if (ch->toslots != 0)
                xpt_release_simq(ch->sim, TRUE);
        ch->eslots = 0;
        ch->recovery = 0;
        ch->toslots = 0;
        ch->fatalerr = 0;
        /* Disable port interrupts */
        ATA_OUTL(ch->r_mem, SIIS_P_IECLR, 0x0000FFFF);
        /* Set speed limit. */
        sata_rev = ch->user[ch->pm_present ? 15 : 0].revision;
        if (sata_rev == 1)
                val = ATA_SC_SPD_SPEED_GEN1;
        else if (sata_rev == 2)
                val = ATA_SC_SPD_SPEED_GEN2;
        else if (sata_rev == 3)
                val = ATA_SC_SPD_SPEED_GEN3;
        else
                val = 0;
        ATA_OUTL(ch->r_mem, SIIS_P_SCTL,
            ATA_SC_DET_IDLE | val | ((ch->pm_level > 0) ? 0 :
            (ATA_SC_IPM_DIS_PARTIAL | ATA_SC_IPM_DIS_SLUMBER)));
retry:
        siis_devreset(dev);
        /* Reset and reconnect PHY, */
        if (!siis_sata_connect(ch)) {
                ch->devices = 0;
                /* Enable port interrupts */
                ATA_OUTL(ch->r_mem, SIIS_P_IESET, SIIS_P_IX_ENABLED);
                if (bootverbose)
                        device_printf(dev,
                            "SIIS reset done: phy reset found no device\n");
                /* Tell the XPT about the event */
                xpt_async(AC_BUS_RESET, ch->path, NULL);
                xpt_release_simq(ch->sim, TRUE);
                return;
        }
        /* Wait for port ready status. */
        if (siis_wait_ready(dev, 1000)) {
                device_printf(dev, "port ready timeout\n");
                if (!retry) {
                        device_printf(dev, "trying full port reset ...\n");
                        /* Get port to the reset state. */
                        ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_PORT_RESET);
                        DELAY(10000);
                        /* Get port out of reset state. */
                        ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_PORT_RESET);
                        ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_32BIT);
                        if (ch->pm_present)
                                ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_PME);
                        else
                                ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_PME);
                        siis_wait_ready(dev, 5000);
                        retry = 1;
                        goto retry;
                }
        }
        ch->devices = 1;
        /* Enable port interrupts */
        ATA_OUTL(ch->r_mem, SIIS_P_IS, 0xFFFFFFFF);
        ATA_OUTL(ch->r_mem, SIIS_P_IESET, SIIS_P_IX_ENABLED);
        if (bootverbose)
                device_printf(dev, "SIIS reset done: devices=%08x\n", ch->devices);
        /* Tell the XPT about the event */
        xpt_async(AC_BUS_RESET, ch->path, NULL);
        xpt_release_simq(ch->sim, TRUE);
}

static int
siis_setup_fis(device_t dev, struct siis_cmd *ctp, union ccb *ccb, int tag)
{
        struct siis_channel *ch = device_get_softc(dev);
        u_int8_t *fis = &ctp->fis[0];

        bzero(fis, 24);
        fis[0] = 0x27;                  /* host to device */
        fis[1] = (ccb->ccb_h.target_id & 0x0f);
        if (ccb->ccb_h.func_code == XPT_SCSI_IO) {
                fis[1] |= 0x80;
                fis[2] = ATA_PACKET_CMD;
                if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE &&
                    ch->curr[ccb->ccb_h.target_id].mode >= ATA_DMA)
                        fis[3] = ATA_F_DMA;
                else {
                        fis[5] = ccb->csio.dxfer_len;
                        fis[6] = ccb->csio.dxfer_len >> 8;
                }
                fis[7] = ATA_D_LBA;
                fis[15] = ATA_A_4BIT;
                bzero(ctp->u.atapi.ccb, 16);
                bcopy((ccb->ccb_h.flags & CAM_CDB_POINTER) ?
                    ccb->csio.cdb_io.cdb_ptr : ccb->csio.cdb_io.cdb_bytes,
                    ctp->u.atapi.ccb, ccb->csio.cdb_len);
        } else if ((ccb->ataio.cmd.flags & CAM_ATAIO_CONTROL) == 0) {
                fis[1] |= 0x80;
                fis[2] = ccb->ataio.cmd.command;
                fis[3] = ccb->ataio.cmd.features;
                fis[4] = ccb->ataio.cmd.lba_low;
                fis[5] = ccb->ataio.cmd.lba_mid;
                fis[6] = ccb->ataio.cmd.lba_high;
                fis[7] = ccb->ataio.cmd.device;
                fis[8] = ccb->ataio.cmd.lba_low_exp;
                fis[9] = ccb->ataio.cmd.lba_mid_exp;
                fis[10] = ccb->ataio.cmd.lba_high_exp;
                fis[11] = ccb->ataio.cmd.features_exp;
                fis[12] = ccb->ataio.cmd.sector_count;
                if (ccb->ataio.cmd.flags & CAM_ATAIO_FPDMA) {
                        fis[12] &= 0x07;
                        fis[12] |= tag << 3;
                }
                fis[13] = ccb->ataio.cmd.sector_count_exp;
                if (ccb->ataio.ata_flags & ATA_FLAG_ICC)
                        fis[14] = ccb->ataio.icc;
                fis[15] = ATA_A_4BIT;
                if (ccb->ataio.ata_flags & ATA_FLAG_AUX) {
                        fis[16] =  ccb->ataio.aux        & 0xff;
                        fis[17] = (ccb->ataio.aux >>  8) & 0xff;
                        fis[18] = (ccb->ataio.aux >> 16) & 0xff;
                        fis[19] = (ccb->ataio.aux >> 24) & 0xff;
                }
        } else {
                /* Soft reset. */
        }
        return (20);
}

static int
siis_sata_connect(struct siis_channel *ch)
{
        u_int32_t status;
        int timeout, found = 0;

        /* Wait up to 100ms for "connect well" */
        for (timeout = 0; timeout < 1000 ; timeout++) {
                status = ATA_INL(ch->r_mem, SIIS_P_SSTS);
                if ((status & ATA_SS_DET_MASK) != ATA_SS_DET_NO_DEVICE)
                        found = 1;
                if (((status & ATA_SS_DET_MASK) == ATA_SS_DET_PHY_ONLINE) &&
                    ((status & ATA_SS_SPD_MASK) != ATA_SS_SPD_NO_SPEED) &&
                    ((status & ATA_SS_IPM_MASK) == ATA_SS_IPM_ACTIVE))
                        break;
                if ((status & ATA_SS_DET_MASK) == ATA_SS_DET_PHY_OFFLINE) {
                        if (bootverbose) {
                                device_printf(ch->dev, "SATA offline status=%08x\n",
                                    status);
                        }
                        return (0);
                }
                if (found == 0 && timeout >= 100)
                        break;
                DELAY(100);
        }
        if (timeout >= 1000 || !found) {
                if (bootverbose) {
                        device_printf(ch->dev,
                            "SATA connect timeout time=%dus status=%08x\n",
                            timeout * 100, status);
                }
                return (0);
        }
        if (bootverbose) {
                device_printf(ch->dev, "SATA connect time=%dus status=%08x\n",
                    timeout * 100, status);
        }
        /* Clear SATA error register */
        ATA_OUTL(ch->r_mem, SIIS_P_SERR, 0xffffffff);
        return (1);
}

static int
siis_check_ids(device_t dev, union ccb *ccb)
{

        if (ccb->ccb_h.target_id > 15) {
                ccb->ccb_h.status = CAM_TID_INVALID;
                xpt_done(ccb);
                return (-1);
        }
        if (ccb->ccb_h.target_lun != 0) {
                ccb->ccb_h.status = CAM_LUN_INVALID;
                xpt_done(ccb);
                return (-1);
        }
        return (0);
}

static void
siisaction(struct cam_sim *sim, union ccb *ccb)
{
        device_t dev, parent;
        struct siis_channel *ch;

        CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("siisaction func_code=%x\n",
            ccb->ccb_h.func_code));

        ch = (struct siis_channel *)cam_sim_softc(sim);
        dev = ch->dev;
        mtx_assert(&ch->mtx, MA_OWNED);
        switch (ccb->ccb_h.func_code) {
        /* Common cases first */
        case XPT_ATA_IO:        /* Execute the requested I/O operation */
        case XPT_SCSI_IO:
                if (siis_check_ids(dev, ccb))
                        return;
                if (ch->devices == 0 ||
                    (ch->pm_present == 0 &&
                     ccb->ccb_h.target_id > 0 && ccb->ccb_h.target_id < 15)) {
                        ccb->ccb_h.status = CAM_SEL_TIMEOUT;
                        break;
                }
                ccb->ccb_h.recovery_type = RECOVERY_NONE;
                /* Check for command collision. */
                if (siis_check_collision(dev, ccb)) {
                        /* Freeze command. */
                        ch->frozen = ccb;
                        /* We have only one frozen slot, so freeze simq also. */
                        xpt_freeze_simq(ch->sim, 1);
                        return;
                }
                siis_begin_transaction(dev, ccb);
                return;
        case XPT_ABORT:                 /* Abort the specified CCB */
                /* XXX Implement */
                ccb->ccb_h.status = CAM_REQ_INVALID;
                break;
        case XPT_SET_TRAN_SETTINGS:
        {
                struct  ccb_trans_settings *cts = &ccb->cts;
                struct  siis_device *d; 

                if (siis_check_ids(dev, ccb))
                        return;
                if (cts->type == CTS_TYPE_CURRENT_SETTINGS)
                        d = &ch->curr[ccb->ccb_h.target_id];
                else
                        d = &ch->user[ccb->ccb_h.target_id];
                if (cts->xport_specific.sata.valid & CTS_SATA_VALID_REVISION)
                        d->revision = cts->xport_specific.sata.revision;
                if (cts->xport_specific.sata.valid & CTS_SATA_VALID_MODE)
                        d->mode = cts->xport_specific.sata.mode;
                if (cts->xport_specific.sata.valid & CTS_SATA_VALID_BYTECOUNT)
                        d->bytecount = min(8192, cts->xport_specific.sata.bytecount);
                if (cts->xport_specific.sata.valid & CTS_SATA_VALID_TAGS)
                        d->tags = min(SIIS_MAX_SLOTS, cts->xport_specific.sata.tags);
                if (cts->xport_specific.sata.valid & CTS_SATA_VALID_PM) {
                        ch->pm_present = cts->xport_specific.sata.pm_present;
                        if (ch->pm_present)
                                ATA_OUTL(ch->r_mem, SIIS_P_CTLSET, SIIS_P_CTL_PME);
                        else
                                ATA_OUTL(ch->r_mem, SIIS_P_CTLCLR, SIIS_P_CTL_PME);
                }
                if (cts->xport_specific.sata.valid & CTS_SATA_VALID_TAGS)
                        d->atapi = cts->xport_specific.sata.atapi;
                if (cts->xport_specific.sata.valid & CTS_SATA_VALID_CAPS)
                        d->caps = cts->xport_specific.sata.caps;
                ccb->ccb_h.status = CAM_REQ_CMP;
                break;
        }
        case XPT_GET_TRAN_SETTINGS:
        /* Get default/user set transfer settings for the target */
        {
                struct  ccb_trans_settings *cts = &ccb->cts;
                struct  siis_device *d;
                uint32_t status;

                if (siis_check_ids(dev, ccb))
                        return;
                if (cts->type == CTS_TYPE_CURRENT_SETTINGS)
                        d = &ch->curr[ccb->ccb_h.target_id];
                else
                        d = &ch->user[ccb->ccb_h.target_id];
                cts->protocol = PROTO_UNSPECIFIED;
                cts->protocol_version = PROTO_VERSION_UNSPECIFIED;
                cts->transport = XPORT_SATA;
                cts->transport_version = XPORT_VERSION_UNSPECIFIED;
                cts->proto_specific.valid = 0;
                cts->xport_specific.sata.valid = 0;
                if (cts->type == CTS_TYPE_CURRENT_SETTINGS &&
                    (ccb->ccb_h.target_id == 15 ||
                    (ccb->ccb_h.target_id == 0 && !ch->pm_present))) {
                        status = ATA_INL(ch->r_mem, SIIS_P_SSTS) & ATA_SS_SPD_MASK;
                        if (status & 0x0f0) {
                                cts->xport_specific.sata.revision =
                                    (status & 0x0f0) >> 4;
                                cts->xport_specific.sata.valid |=
                                    CTS_SATA_VALID_REVISION;
                        }
                        cts->xport_specific.sata.caps = d->caps & CTS_SATA_CAPS_D;
                        if (ch->pm_level)
                                cts->xport_specific.sata.caps |= CTS_SATA_CAPS_H_PMREQ;
                        cts->xport_specific.sata.caps |= CTS_SATA_CAPS_H_AN;
                        cts->xport_specific.sata.caps &=
                            ch->user[ccb->ccb_h.target_id].caps;
                        cts->xport_specific.sata.valid |= CTS_SATA_VALID_CAPS;
                } else {
                        cts->xport_specific.sata.revision = d->revision;
                        cts->xport_specific.sata.valid |= CTS_SATA_VALID_REVISION;
                        cts->xport_specific.sata.caps = d->caps;
                        if (cts->type == CTS_TYPE_CURRENT_SETTINGS &&
                            (ch->quirks & SIIS_Q_SNTF) == 0)
                                cts->xport_specific.sata.caps &= ~CTS_SATA_CAPS_H_AN;
                        cts->xport_specific.sata.valid |= CTS_SATA_VALID_CAPS;
                }
                cts->xport_specific.sata.mode = d->mode;
                cts->xport_specific.sata.valid |= CTS_SATA_VALID_MODE;
                cts->xport_specific.sata.bytecount = d->bytecount;
                cts->xport_specific.sata.valid |= CTS_SATA_VALID_BYTECOUNT;
                cts->xport_specific.sata.pm_present = ch->pm_present;
                cts->xport_specific.sata.valid |= CTS_SATA_VALID_PM;
                cts->xport_specific.sata.tags = d->tags;
                cts->xport_specific.sata.valid |= CTS_SATA_VALID_TAGS;
                cts->xport_specific.sata.atapi = d->atapi;
                cts->xport_specific.sata.valid |= CTS_SATA_VALID_ATAPI;
                ccb->ccb_h.status = CAM_REQ_CMP;
                break;
        }
        case XPT_RESET_BUS:             /* Reset the specified SCSI bus */
        case XPT_RESET_DEV:     /* Bus Device Reset the specified SCSI device */
                siis_reset(dev);
                ccb->ccb_h.status = CAM_REQ_CMP;
                break;
        case XPT_TERM_IO:               /* Terminate the I/O process */
                /* XXX Implement */
                ccb->ccb_h.status = CAM_REQ_INVALID;
                break;
        case XPT_PATH_INQ:              /* Path routing inquiry */
        {
                struct ccb_pathinq *cpi = &ccb->cpi;

                parent = device_get_parent(dev);
                cpi->version_num = 1; /* XXX??? */
                cpi->hba_inquiry = PI_SDTR_ABLE | PI_TAG_ABLE;
                cpi->hba_inquiry |= PI_SATAPM;
                cpi->target_sprt = 0;
                cpi->hba_misc = PIM_SEQSCAN | PIM_UNMAPPED | PIM_ATA_EXT;
                cpi->hba_eng_cnt = 0;
                cpi->max_target = 15;
                cpi->max_lun = 0;
                cpi->initiator_id = 0;
                cpi->bus_id = cam_sim_bus(sim);
                cpi->base_transfer_speed = 150000;
                strlcpy(cpi->sim_vid, "FreeBSD", SIM_IDLEN);
                strlcpy(cpi->hba_vid, "SIIS", HBA_IDLEN);
                strlcpy(cpi->dev_name, cam_sim_name(sim), DEV_IDLEN);
                cpi->unit_number = cam_sim_unit(sim);
                cpi->transport = XPORT_SATA;
                cpi->transport_version = XPORT_VERSION_UNSPECIFIED;
                cpi->protocol = PROTO_ATA;
                cpi->protocol_version = PROTO_VERSION_UNSPECIFIED;
                cpi->maxio = maxphys;
                cpi->hba_vendor = pci_get_vendor(parent);
                cpi->hba_device = pci_get_device(parent);
                cpi->hba_subvendor = pci_get_subvendor(parent);
                cpi->hba_subdevice = pci_get_subdevice(parent);
                cpi->ccb_h.status = CAM_REQ_CMP;
                break;
        }
        default:
                ccb->ccb_h.status = CAM_REQ_INVALID;
                break;
        }
        xpt_done(ccb);
}

static void
siispoll(struct cam_sim *sim)
{
        struct siis_channel *ch = (struct siis_channel *)cam_sim_softc(sim);

        siis_ch_intr(ch->dev);
}