/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 1998 - 2008 Søren Schmidt <sos@FreeBSD.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer,
 *    without modification, immediately at the beginning of the file.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/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/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/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <dev/ata/ata-all.h>
#include <dev/ata/ata-pci.h>
#include <ata_if.h>

/* local prototypes */
static int ata_acard_chipinit(device_t dev);
static int ata_acard_ch_attach(device_t dev);
static int ata_acard_status(device_t dev);
static int ata_acard_850_setmode(device_t dev, int target, int mode);
static int ata_acard_86X_setmode(device_t dev, int target, int mode);

/* misc defines */
#define ATP_OLD         1

/*
 * Acard chipset support functions
 */
static int
ata_acard_probe(device_t dev)
{
    struct ata_pci_controller *ctlr = device_get_softc(dev);
    static const struct ata_chip_id ids[] =
    {{ ATA_ATP850R, 0, ATP_OLD, 0x00, ATA_UDMA2, "ATP850" },
     { ATA_ATP860A, 0, 0,       0x00, ATA_UDMA4, "ATP860A" },
     { ATA_ATP860R, 0, 0,       0x00, ATA_UDMA4, "ATP860R" },
     { ATA_ATP865A, 0, 0,       0x00, ATA_UDMA6, "ATP865A" },
     { ATA_ATP865R, 0, 0,       0x00, ATA_UDMA6, "ATP865R" },
     { 0, 0, 0, 0, 0, 0}};

    if (pci_get_vendor(dev) != ATA_ACARD_ID)
        return ENXIO;

    if (!(ctlr->chip = ata_match_chip(dev, ids)))
        return ENXIO;

    ata_set_desc(dev);
    ctlr->chipinit = ata_acard_chipinit;
    return (BUS_PROBE_LOW_PRIORITY);
}

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

    if (ata_setup_interrupt(dev, ata_generic_intr))
        return ENXIO;

    ctlr->ch_attach = ata_acard_ch_attach;
    ctlr->ch_detach = ata_pci_ch_detach;
    if (ctlr->chip->cfg1 == ATP_OLD) {
        ctlr->setmode = ata_acard_850_setmode;
        /* Work around the lack of channel serialization in ATA_CAM. */
        ctlr->channels = 1;
        device_printf(dev, "second channel ignored\n");
    }
    else
        ctlr->setmode = ata_acard_86X_setmode;
    return 0;
}

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

    /* setup the usual register normal pci style */
    if (ata_pci_ch_attach(dev))
        return ENXIO;

    ch->hw.status = ata_acard_status;
    ch->flags |= ATA_NO_ATAPI_DMA;
    return 0;
}

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

    if (ch->dma.flags & ATA_DMA_ACTIVE) {
        int bmstat = ATA_IDX_INB(ch, ATA_BMSTAT_PORT) & ATA_BMSTAT_MASK;

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

static int
ata_acard_850_setmode(device_t dev, int target, int mode)
{
    device_t parent = device_get_parent(dev);
    struct ata_pci_controller *ctlr = device_get_softc(parent);
    struct ata_channel *ch = device_get_softc(dev);
    int devno = (ch->unit << 1) + target;

    mode = min(mode, ctlr->chip->max_dma);
    /* XXX SOS missing WDMA0+1 + PIO modes */
    if (mode >= ATA_WDMA2) {
            u_int8_t reg54 = pci_read_config(parent, 0x54, 1);
            
            reg54 &= ~(0x03 << (devno << 1));
            if (mode >= ATA_UDMA0)
                reg54 |= (((mode & ATA_MODE_MASK) + 1) << (devno << 1));
            pci_write_config(parent, 0x54, reg54, 1);
            pci_write_config(parent, 0x4a, 0xa6, 1);
            pci_write_config(parent, 0x40 + (devno << 1), 0x0301, 2);
    }
    /* we could set PIO mode timings, but we assume the BIOS did that */
    return (mode);
}

static int
ata_acard_86X_setmode(device_t dev, int target, int mode)
{
        device_t parent = device_get_parent(dev);
        struct ata_pci_controller *ctlr = device_get_softc(parent);
        struct ata_channel *ch = device_get_softc(dev);
        int devno = (ch->unit << 1) + target;

        mode = min(mode, ctlr->chip->max_dma);
        /* XXX SOS missing WDMA0+1 + PIO modes */
        if (mode >= ATA_WDMA2) {
                u_int16_t reg44 = pci_read_config(parent, 0x44, 2);
            
                reg44 &= ~(0x000f << (devno << 2));
                if (mode >= ATA_UDMA0)
                        reg44 |= (((mode & ATA_MODE_MASK) + 1) << (devno << 2));
                pci_write_config(parent, 0x44, reg44, 2);
                pci_write_config(parent, 0x4a, 0xa6, 1);
                pci_write_config(parent, 0x40 + devno, 0x31, 1);
        }
        /* we could set PIO mode timings, but we assume the BIOS did that */
        return (mode);
}

ATA_DECLARE_DRIVER(ata_acard);