/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (c) 2002-2003
 *      Hidetoshi Shimokawa. 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.
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *
 *      This product includes software developed by Hidetoshi Shimokawa.
 *
 * 4. Neither the name of the author nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#ifdef __FreeBSD__
#include <sys/cdefs.h>
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>

#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/sysctl.h>
#include <sys/bio.h>

#include <sys/bus.h>
#include <machine/bus.h>

#include <sys/signal.h>
#include <sys/mman.h>
#include <sys/ioccom.h>
#include <sys/fcntl.h>

#include <dev/firewire/firewire.h>
#include <dev/firewire/firewirereg.h>
#include <dev/firewire/fwmem.h>

static int fwmem_speed = 2, fwmem_debug = 0;
static struct fw_eui64 fwmem_eui64;
SYSCTL_DECL(_hw_firewire);
static SYSCTL_NODE(_hw_firewire, OID_AUTO, fwmem,
    CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
    "FireWire Memory Access");
SYSCTL_UINT(_hw_firewire_fwmem, OID_AUTO, eui64_hi, CTLFLAG_RW,
        &fwmem_eui64.hi, 0, "Fwmem target EUI64 high");
SYSCTL_UINT(_hw_firewire_fwmem, OID_AUTO, eui64_lo, CTLFLAG_RW,
        &fwmem_eui64.lo, 0, "Fwmem target EUI64 low");
SYSCTL_INT(_hw_firewire_fwmem, OID_AUTO, speed, CTLFLAG_RW, &fwmem_speed, 0,
        "Fwmem link speed");
SYSCTL_INT(_debug, OID_AUTO, fwmem_debug, CTLFLAG_RW, &fwmem_debug, 0,
        "Fwmem driver debug flag");

static MALLOC_DEFINE(M_FWMEM, "fwmem", "fwmem/FireWire");

#define MAXLEN (512 << fwmem_speed)

struct fwmem_softc {
        struct fw_eui64 eui;
        struct firewire_softc *sc;
        int refcount;
};

static struct fw_xfer *
fwmem_xfer_req(
        struct fw_device *fwdev,
        caddr_t sc,
        int spd,
        int slen,
        int rlen,
        void *hand)
{
        struct fw_xfer *xfer;

        xfer = fw_xfer_alloc(M_FWMEM);
        if (xfer == NULL)
                return NULL;

        xfer->fc = fwdev->fc;
        xfer->send.hdr.mode.hdr.dst = FWLOCALBUS | fwdev->dst;
        if (spd < 0)
                xfer->send.spd = fwdev->speed;
        else
                xfer->send.spd = min(spd, fwdev->speed);
        xfer->hand = hand;
        xfer->sc = sc;
        xfer->send.pay_len = slen;
        xfer->recv.pay_len = rlen;

        return xfer;
}

struct fw_xfer *
fwmem_read_quad(
        struct fw_device *fwdev,
        caddr_t sc,
        uint8_t spd,
        uint16_t dst_hi,
        uint32_t dst_lo,
        void *data,
        void (*hand)(struct fw_xfer *))
{
        struct fw_xfer *xfer;
        struct fw_pkt *fp;

        xfer = fwmem_xfer_req(fwdev, sc, spd, 0, 4, hand);
        if (xfer == NULL) {
                return NULL;
        }

        fp = &xfer->send.hdr;
        fp->mode.rreqq.tcode = FWTCODE_RREQQ;
        fp->mode.rreqq.dest_hi = dst_hi;
        fp->mode.rreqq.dest_lo = dst_lo;

        xfer->send.payload = NULL;
        xfer->recv.payload = (uint32_t *)data;

        if (fwmem_debug)
                printf("fwmem_read_quad: %d %04x:%08x\n", fwdev->dst,
                    dst_hi, dst_lo);

        if (fw_asyreq(xfer->fc, -1, xfer) == 0)
                return xfer;

        fw_xfer_free(xfer);
        return NULL;
}

struct fw_xfer *
fwmem_write_quad(
        struct fw_device *fwdev,
        caddr_t sc,
        uint8_t spd,
        uint16_t dst_hi,
        uint32_t dst_lo,
        void *data,
        void (*hand)(struct fw_xfer *))
{
        struct fw_xfer *xfer;
        struct fw_pkt *fp;

        xfer = fwmem_xfer_req(fwdev, sc, spd, 0, 0, hand);
        if (xfer == NULL)
                return NULL;

        fp = &xfer->send.hdr;
        fp->mode.wreqq.tcode = FWTCODE_WREQQ;
        fp->mode.wreqq.dest_hi = dst_hi;
        fp->mode.wreqq.dest_lo = dst_lo;
        fp->mode.wreqq.data = *(uint32_t *)data;

        xfer->send.payload = xfer->recv.payload = NULL;

        if (fwmem_debug)
                printf("fwmem_write_quad: %d %04x:%08x %08x\n", fwdev->dst,
                    dst_hi, dst_lo, *(uint32_t *)data);

        if (fw_asyreq(xfer->fc, -1, xfer) == 0)
                return xfer;

        fw_xfer_free(xfer);
        return NULL;
}

struct fw_xfer *
fwmem_read_block(
        struct fw_device *fwdev,
        caddr_t sc,
        uint8_t spd,
        uint16_t dst_hi,
        uint32_t dst_lo,
        int len,
        void *data,
        void (*hand)(struct fw_xfer *))
{
        struct fw_xfer *xfer;
        struct fw_pkt *fp;

        xfer = fwmem_xfer_req(fwdev, sc, spd, 0, roundup2(len, 4), hand);
        if (xfer == NULL)
                return NULL;

        fp = &xfer->send.hdr;
        fp->mode.rreqb.tcode = FWTCODE_RREQB;
        fp->mode.rreqb.dest_hi = dst_hi;
        fp->mode.rreqb.dest_lo = dst_lo;
        fp->mode.rreqb.len = len;
        fp->mode.rreqb.extcode = 0;

        xfer->send.payload = NULL;
        xfer->recv.payload = data;

        if (fwmem_debug)
                printf("fwmem_read_block: %d %04x:%08x %d\n", fwdev->dst,
                    dst_hi, dst_lo, len);
        if (fw_asyreq(xfer->fc, -1, xfer) == 0)
                return xfer;

        fw_xfer_free(xfer);
        return NULL;
}

struct fw_xfer *
fwmem_write_block(
        struct fw_device *fwdev,
        caddr_t sc,
        uint8_t spd,
        uint16_t dst_hi,
        uint32_t dst_lo,
        int len,
        void *data,
        void (*hand)(struct fw_xfer *))
{
        struct fw_xfer *xfer;
        struct fw_pkt *fp;

        xfer = fwmem_xfer_req(fwdev, sc, spd, len, 0, hand);
        if (xfer == NULL)
                return NULL;

        fp = &xfer->send.hdr;
        fp->mode.wreqb.tcode = FWTCODE_WREQB;
        fp->mode.wreqb.dest_hi = dst_hi;
        fp->mode.wreqb.dest_lo = dst_lo;
        fp->mode.wreqb.len = len;
        fp->mode.wreqb.extcode = 0;

        xfer->send.payload = data;
        xfer->recv.payload = NULL;

        if (fwmem_debug)
                printf("fwmem_write_block: %d %04x:%08x %d\n", fwdev->dst,
                                dst_hi, dst_lo, len);
        if (fw_asyreq(xfer->fc, -1, xfer) == 0)
                return xfer;

        fw_xfer_free(xfer);
        return NULL;
}

int
fwmem_open(struct cdev *dev, int flags, int fmt, fw_proc *td)
{
        struct fwmem_softc *fms;
        struct firewire_softc *sc;
        int unit = DEV2UNIT(dev);

        sc = devclass_get_softc(firewire_devclass, unit);
        if (sc == NULL)
                return (ENXIO);

        FW_GLOCK(sc->fc);
        if (dev->si_drv1 != NULL) {
                if ((flags & FWRITE) != 0) {
                        FW_GUNLOCK(sc->fc);
                        return (EBUSY);
                }
                FW_GUNLOCK(sc->fc);
                fms = dev->si_drv1;
                fms->refcount++;
        } else {
                dev->si_drv1 = (void *)-1;
                FW_GUNLOCK(sc->fc);
                dev->si_drv1 = malloc(sizeof(struct fwmem_softc),
                    M_FWMEM, M_WAITOK);
                dev->si_iosize_max = DFLTPHYS;
                fms = dev->si_drv1;
                bcopy(&fwmem_eui64, &fms->eui, sizeof(struct fw_eui64));
                fms->sc = sc;
                fms->refcount = 1;
        }
        if (fwmem_debug)
                printf("%s: refcount=%d\n", __func__, fms->refcount);

        return (0);
}

int
fwmem_close (struct cdev *dev, int flags, int fmt, fw_proc *td)
{
        struct fwmem_softc *fms;

        fms = dev->si_drv1;

        FW_GLOCK(fms->sc->fc);
        fms->refcount--;
        FW_GUNLOCK(fms->sc->fc);
        if (fwmem_debug)
                printf("%s: refcount=%d\n", __func__, fms->refcount);
        if (fms->refcount < 1) {
                free(dev->si_drv1, M_FWMEM);
                dev->si_drv1 = NULL;
        }

        return (0);
}


static void
fwmem_biodone(struct fw_xfer *xfer)
{
        struct bio *bp;

        bp = (struct bio *)xfer->sc;
        bp->bio_error = xfer->resp;

        if (bp->bio_error != 0) {
                if (fwmem_debug)
                        printf("%s: err=%d\n", __func__, bp->bio_error);
                bp->bio_flags |= BIO_ERROR;
                bp->bio_resid = bp->bio_bcount;
        }

        fw_xfer_free(xfer);
        biodone(bp);
}

void
fwmem_strategy(struct bio *bp)
{
        struct fwmem_softc *fms;
        struct fw_device *fwdev;
        struct fw_xfer *xfer;
        struct cdev *dev;
        int err = 0, iolen;

        dev = bp->bio_dev;
        /* XXX check request length */

        fms = dev->si_drv1;
        fwdev = fw_noderesolve_eui64(fms->sc->fc, &fms->eui);
        if (fwdev == NULL) {
                if (fwmem_debug)
                        printf("fwmem: no such device ID:%08x%08x\n",
                            fms->eui.hi, fms->eui.lo);
                err = EINVAL;
                goto error;
        }

        iolen = MIN(bp->bio_bcount, MAXLEN);
        if (bp->bio_cmd == BIO_READ) {
                if (iolen == 4 && (bp->bio_offset & 3) == 0)
                        xfer = fwmem_read_quad(fwdev,
                            (void *)bp, fwmem_speed,
                            bp->bio_offset >> 32, bp->bio_offset & 0xffffffff,
                            bp->bio_data, fwmem_biodone);
                else
                        xfer = fwmem_read_block(fwdev,
                            (void *)bp, fwmem_speed,
                            bp->bio_offset >> 32, bp->bio_offset & 0xffffffff,
                            iolen, bp->bio_data, fwmem_biodone);
        } else {
                if (iolen == 4 && (bp->bio_offset & 3) == 0)
                        xfer = fwmem_write_quad(fwdev,
                            (void *)bp, fwmem_speed,
                            bp->bio_offset >> 32, bp->bio_offset & 0xffffffff,
                            bp->bio_data, fwmem_biodone);
                else
                        xfer = fwmem_write_block(fwdev,
                            (void *)bp, fwmem_speed,
                            bp->bio_offset >> 32, bp->bio_offset & 0xffffffff,
                            iolen, bp->bio_data, fwmem_biodone);
        }
        if (xfer == NULL) {
                err = EIO;
                goto error;
        }
        /* XXX */
        bp->bio_resid = bp->bio_bcount - iolen;
error:
        if (err != 0) {
                if (fwmem_debug)
                        printf("%s: err=%d\n", __func__, err);
                bp->bio_error = err;
                bp->bio_flags |= BIO_ERROR;
                bp->bio_resid = bp->bio_bcount;
                biodone(bp);
        }
}

int
fwmem_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, fw_proc *td)
{
        struct fwmem_softc *fms;
        int err = 0;

        fms = dev->si_drv1;
        switch (cmd) {
        case FW_SDEUI64:
                bcopy(data, &fms->eui, sizeof(struct fw_eui64));
                break;
        case FW_GDEUI64:
                bcopy(&fms->eui, data, sizeof(struct fw_eui64));
                break;
        default:
                err = EINVAL;
        }
        return (err);
}

int
fwmem_poll(struct cdev *dev, int events, fw_proc *td)
{
        return EINVAL;
}

int
fwmem_mmap(struct cdev *dev, vm_ooffset_t offset, vm_paddr_t *paddr,
    int nproto, vm_memattr_t *memattr)
{
        return EINVAL;
}