/*      $NetBSD: fwmem.c,v 1.19 2018/09/03 16:29:31 riastradh Exp $     */
/*-
* 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.
*
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: fwmem.c,v 1.19 2018/09/03 16:29:31 riastradh Exp $");

#include <sys/param.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>

#include <dev/ieee1394/firewire.h>
#include <dev/ieee1394/firewirereg.h>
#include <dev/ieee1394/fwmem.h>

#include "ioconf.h"

static int fwmem_speed=2, fwmem_debug=0;
static struct fw_eui64 fwmem_eui64;

static int sysctl_fwmem_verify(SYSCTLFN_PROTO, int, int);
static int sysctl_fwmem_verify_speed(SYSCTLFN_PROTO);

static struct fw_xfer *fwmem_xfer_req(struct fw_device *, void *, int, int,
                                     int, void *);
static void fwmem_biodone(struct fw_xfer *);

/*
* Setup sysctl(3) MIB, hw.fwmem.*
*
* TBD condition CTLFLAG_PERMANENT on being a module or not
*/
SYSCTL_SETUP(sysctl_fwmem, "sysctl fwmem subtree setup")
{
       int rc, fwmem_node_num;
       const struct sysctlnode *node;

       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT, CTLTYPE_NODE, "fwmem",
           SYSCTL_DESCR("IEEE1394 Memory Access"),
           NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) {
               goto err;
       }
       fwmem_node_num = node->sysctl_num;

       /* fwmem target EUI64 high/low */
       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
           "eui64_hi", SYSCTL_DESCR("Fwmem target EUI64 high"),
           NULL, 0, &fwmem_eui64.hi,
           0, CTL_HW, fwmem_node_num, CTL_CREATE, CTL_EOL)) != 0) {
               goto err;
       }
       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
           "eui64_lo", SYSCTL_DESCR("Fwmem target EUI64 low"),
           NULL, 0, &fwmem_eui64.lo,
           0, CTL_HW, fwmem_node_num, CTL_CREATE, CTL_EOL)) != 0) {
               goto err;
       }

       /* fwmem link speed */
       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
           "speed", SYSCTL_DESCR("Fwmem link speed"),
           sysctl_fwmem_verify_speed, 0, &fwmem_speed,
           0, CTL_HW, fwmem_node_num, CTL_CREATE, CTL_EOL)) != 0) {
               goto err;
       }

       /* fwmem driver debug flag */
       if ((rc = sysctl_createv(clog, 0, NULL, &node,
           CTLFLAG_PERMANENT | CTLFLAG_READWRITE, CTLTYPE_INT,
           "fwmem_debug", SYSCTL_DESCR("Fwmem driver debug flag"),
           NULL, 0, &fwmem_debug,
           0, CTL_HW, fwmem_node_num, CTL_CREATE, CTL_EOL)) != 0) {
               goto err;
       }

       return;

err:
       printf("%s: sysctl_createv failed (rc = %d)\n", __func__, rc);
}

static int
sysctl_fwmem_verify(SYSCTLFN_ARGS, int lower, int upper)
{
       int error, t;
       struct sysctlnode node;

       node = *rnode;
       t = *(int*)rnode->sysctl_data;
       node.sysctl_data = &t;
       error = sysctl_lookup(SYSCTLFN_CALL(&node));
       if (error || newp == NULL)
               return error;

       if (t < lower || t > upper)
               return EINVAL;

       *(int*)rnode->sysctl_data = t;

       return 0;
}

static int
sysctl_fwmem_verify_speed(SYSCTLFN_ARGS)
{

       return sysctl_fwmem_verify(SYSCTLFN_CALL(rnode), 0, FWSPD_S400);
}

#define MAXLEN (512 << fwmem_speed)

struct fwmem_softc {
       struct fw_eui64 eui;
       struct firewire_softc *sc;
       int refcount;
       STAILQ_HEAD(, fw_xfer) xferlist;
};


int
fwmem_open(dev_t dev, int flags, int fmt, struct lwp *td)
{
       struct firewire_softc *sc;
       struct fwmem_softc *fms;
       struct fw_xfer *xfer;

       sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
       if (sc == NULL)
               return ENXIO;

       if (sc->si_drv1 != NULL) {
               if ((flags & FWRITE) != 0) {
                       return EBUSY;
               }
               fms = (struct fwmem_softc *)sc->si_drv1;
               fms->refcount++;
       } else {
               sc->si_drv1 = (void *)-1;
               sc->si_drv1 = malloc(sizeof(struct fwmem_softc),
                   M_FW, M_WAITOK);
               if (sc->si_drv1 == NULL)
                       return ENOMEM;
               fms = (struct fwmem_softc *)sc->si_drv1;
               memcpy(&fms->eui, &fwmem_eui64, sizeof(struct fw_eui64));
               fms->sc = sc;
               fms->refcount = 1;
               STAILQ_INIT(&fms->xferlist);
               xfer = fw_xfer_alloc(M_FW);
               STAILQ_INSERT_TAIL(&fms->xferlist, xfer, link);
       }
       if (fwmem_debug)
               printf("%s: refcount=%d\n", __func__, fms->refcount);

       return 0;
}

int
fwmem_close(dev_t dev, int flags, int fmt, struct lwp *td)
{
       struct firewire_softc *sc;
       struct fwmem_softc *fms;
       struct fw_xfer *xfer;

       sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
       if (sc == NULL)
               return ENXIO;

       fms = (struct fwmem_softc *)sc->si_drv1;

       fms->refcount--;
       if (fwmem_debug)
               printf("%s: refcount=%d\n", __func__, fms->refcount);
       if (fms->refcount < 1) {
               while ((xfer = STAILQ_FIRST(&fms->xferlist)) != NULL) {
                       STAILQ_REMOVE_HEAD(&fms->xferlist, link);
                       fw_xfer_free(xfer);
               }
               free(sc->si_drv1, M_FW);
               sc->si_drv1 = NULL;
       }

       return 0;
}

void
fwmem_strategy(struct bio *bp)
{
       struct firewire_softc *sc;
       struct fwmem_softc *fms;
       struct fw_device *fwdev;
       struct fw_xfer *xfer;
       dev_t dev = bp->bio_dev;
       int iolen, err = 0, s;

       sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
       if (sc == NULL)
               return;

       /* XXX check request length */

       s = splvm();
       fms = (struct fwmem_softc *)sc->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) == 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:
       splx(s);
       if (err != 0) {
               if (fwmem_debug)
                       printf("%s: err=%d\n", __func__, err);
               bp->bio_error = err;
               bp->bio_resid = bp->bio_bcount;
               biodone(bp);
       }
}

int
fwmem_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *td)
{
       struct firewire_softc *sc;
       struct fwmem_softc *fms;
       int err = 0;

       sc = device_lookup_private(&ieee1394if_cd, DEV2UNIT(dev));
       if (sc == NULL)
               return ENXIO;

       fms = (struct fwmem_softc *)sc->si_drv1;
       switch (cmd) {
       case FW_SDEUI64:
               memcpy(&fms->eui, data, sizeof(struct fw_eui64));
               break;

       case FW_GDEUI64:
               memcpy(data, &fms->eui, sizeof(struct fw_eui64));
               break;

       default:
               err = EINVAL;
       }
       return err;
}


struct fw_xfer *
fwmem_read_quad(struct fw_device *fwdev, void * 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, (void *)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)
               aprint_error("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, void *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)
               aprint_error("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, void *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)
               aprint_error("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, void *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)
               aprint_error("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;
}


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

       xfer = fw_xfer_alloc(M_FW);
       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 = uimin(spd, fwdev->speed);
       xfer->hand = hand;
       xfer->sc = sc;
       xfer->send.pay_len = slen;
       xfer->recv.pay_len = rlen;

       return xfer;
}

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_resid = bp->bio_bcount;
       }

       fw_xfer_free(xfer);
       biodone(bp);
}

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