/*      $NetBSD: icap_ebus.c,v 1.7 2018/03/04 21:41:48 mrg Exp $        */

/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code was written by Alessandro Forin and Neil Pittman
* at Microsoft Research and contributed to The NetBSD Foundation
* by Microsoft Corporation.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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>                  /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: icap_ebus.c,v 1.7 2018/03/04 21:41:48 mrg Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/bufq.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <uvm/uvm_param.h>

#include <emips/ebus/ebusvar.h>
#include <emips/emips/machdep.h>
#include <machine/emipsreg.h>

#define DEBUG_INTR   0x01
#define DEBUG_XFERS  0x02
#define DEBUG_STATUS 0x04
#define DEBUG_FUNCS  0x08
#define DEBUG_PROBE  0x10
#define DEBUG_WRITES 0x20
#define DEBUG_READS  0x40
#define DEBUG_ERRORS 0x80
#ifdef DEBUG
int icap_debug = DEBUG_ERRORS;
#define ICAP_DEBUG(x) (icap_debug & (x))
#define DBGME(_lev_,_x_) if ((_lev_) & icap_debug) _x_
#else
#define ICAP_DEBUG(x) (0)
#define DBGME(_lev_,_x_)
#endif
#define DEBUG_PRINT(_args_,_lev_) DBGME(_lev_,printf _args_)

/*
* Device softc
*/
struct icap_softc {
       device_t sc_dev;
       struct _Icap *sc_dp;
       struct bufq_state *sc_buflist;
       struct buf *sc_bp;
       char *sc_data;
       int sc_count;
};

/* Required funcs
*/
static int      icap_ebus_match (device_t, cfdata_t, void *);
static void     icap_ebus_attach (device_t, device_t, void *);

static dev_type_open(icapopen);
static dev_type_close(icapclose);
static dev_type_read(icapread);
static dev_type_write(icapwrite);
static dev_type_ioctl(icapioctl);
static dev_type_strategy(icapstrategy);

/* Other functions
*/
extern paddr_t kvtophys(vaddr_t);
static void icapstart(struct icap_softc *sc);
static int  icap_ebus_intr(void *cookie, void *f);
static void icap_reset(struct icap_softc *sc);

/* Config stuff
*/
extern struct cfdriver icap_cd;

CFATTACH_DECL_NEW(icap_ebus, sizeof (struct icap_softc),
   icap_ebus_match, icap_ebus_attach, NULL, NULL);

static int
icap_ebus_match(device_t parent, cfdata_t match, void *aux)
{
       struct ebus_attach_args *ia = aux;
   struct _Icap *f = (struct _Icap *)ia->ia_vaddr;

       DEBUG_PRINT(("icap_match %x\n", (f) ? f->Tag : 0), DEBUG_PROBE);
       if (strcmp("icap", ia->ia_name) != 0)
               return (0);
   if ((f == NULL) ||
       (! (f->Tag == PMTTAG_ICAP)))
               return (0);

       return (1);
}

static void
icap_ebus_attach(device_t parent, device_t self, void *aux)
{
       struct icap_softc *sc = device_private(self);
       struct ebus_attach_args *ia =aux;

       DEBUG_PRINT(("icap_attach %p\n", sc), DEBUG_PROBE);

       sc->sc_dev = self;
       sc->sc_dp = (struct _Icap*)ia->ia_vaddr;
       bufq_alloc(&sc->sc_buflist, "fcfs", 0);
       sc->sc_bp = NULL;
       sc->sc_data = NULL;
       sc->sc_count = 0;

#if DEBUG
   printf(" virt=%p", (void*)sc->sc_dp);
#endif
       printf(": %s\n", "Internal Configuration Access Port");

       ebus_intr_establish(parent, (void*)ia->ia_cookie, IPL_BIO,
           icap_ebus_intr, sc);

       icap_reset(sc);
}

/* The character device handlers
*/
const struct cdevsw icap_cdevsw = {
       .d_open = icapopen,
       .d_close = icapclose,
       .d_read = icapread,
       .d_write = icapwrite,
       .d_ioctl = icapioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = nopoll,
       .d_mmap = nommap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = 0
};

/*
* Handle an open request on the device.
*/
static int
icapopen(dev_t device, int flags, int fmt, struct lwp *process)
{
       struct icap_softc *sc;

       DEBUG_PRINT(("icapopen\n"), DEBUG_FUNCS);
       sc = device_lookup_private(&icap_cd, minor(device));
       if (sc == NULL)
               return (ENXIO);

       return 0;
}

/*
* Handle the close request for the device.
*/
static int
icapclose(dev_t device, int flags, int fmt, struct lwp *process)
{
       DEBUG_PRINT(("icapclose\n"), DEBUG_FUNCS);
       return 0; /* this always succeeds */
}

/*
* Handle the read request for the device.
*/
static int
icapread(dev_t dev, struct uio *uio, int flags)
{
       DEBUG_PRINT(("icapread\n"), DEBUG_READS);
       return (physio(icapstrategy, NULL, dev, B_READ, minphys, uio));
}

/*
* Handle the write request for the device.
*/
static int
icapwrite(dev_t dev, struct uio *uio, int flags)
{
       DEBUG_PRINT(("icapwrite\n"), DEBUG_WRITES);
       return (physio(icapstrategy, NULL, dev, B_WRITE, minphys, uio));
}

/*
* Handle the ioctl request for the device.
*/
static int
icapioctl(dev_t dev, u_long xfer, void *addr, int flag, struct lwp *l)
{

       return ENOTTY;
}

/*
* Strategy function for the device.
*/
static void
icapstrategy(struct buf *bp)
{
       struct icap_softc *sc;
       int s;

       DEBUG_PRINT(("icapstrategy\n"), DEBUG_FUNCS);

       /* We did nothing lest we did */
       bp->b_resid = bp->b_bcount;

       /* Do we know you.  */
       sc = device_lookup_private(&icap_cd, minor(bp->b_dev));
       if (sc == NULL) {
               DEBUG_PRINT(("icapstrategy: nodev %" PRIx64 "\n",bp->b_dev),
                   DEBUG_ERRORS);
               bp->b_error = ENXIO;
               biodone(bp);
               return;
           }

       /* Add to Q. If Q was empty get it started */
       s = splbio();
       bufq_put(sc->sc_buflist, bp);
       if (bufq_peek(sc->sc_buflist) == bp) {
               icapstart(sc);
       }
       splx(s);
}

/*
* Get the next I/O request started
*/
static void
icapstart(struct icap_softc *sc)
{
       paddr_t phys, phys2;
       vaddr_t virt;
       size_t count;
       uint32_t fl;
       struct buf *bp = sc->sc_bp;

       DEBUG_PRINT(("icapstart %p %p\n",sc,bp), DEBUG_FUNCS);

   /* Were we idle?
    */
recheck:
   if (bp == NULL) {

       /* Yes, get the next request if any
        */
       bp = bufq_get(sc->sc_buflist);
       DEBUG_PRINT(("icapnext: %p\n",bp), DEBUG_XFERS);
       if (bp == NULL)
           return;
   }

   /* Done with this request?
    */
   if ((bp->b_resid == 0) || bp->b_error) {

       /* Yes, complete and move to next, if any
        */
       sc->sc_bp = NULL;
       biodone(bp);
       DEBUG_PRINT(("icapdone %p\n",bp), DEBUG_XFERS);
       bp = NULL;
       goto recheck;
   }

   /* If new request init the xfer info
    */
   if (sc->sc_bp == NULL) {
       sc->sc_bp = bp;
       sc->sc_data = bp->b_data;
       sc->sc_count = bp->b_resid;
   }

   /* Loop filling as many buffers as will fit in the FIFO
    */
   fl = (bp->b_flags & B_READ) ? ICAPS_F_RECV : ICAPS_F_XMIT;
   for (;;) {

       /* Make sure there's still room in the FIFO, no errors.
        */
       if (sc->sc_dp->Control & (ICAPC_IF_FULL|ICAPC_ERROR))
           break;

       /* How much data do we xfer and where
        */
       virt = (vaddr_t)sc->sc_data;
       phys = kvtophys(virt);
       count = round_page(virt) - virt;
       if (count == 0) count = PAGE_SIZE;/* could(will) be aligned */

       /* How much of it is contiguous
        */
       while (count < sc->sc_count) {
           phys2 = kvtophys(virt + count);
           if (phys2 != (phys + count)) {

               /* No longer contig, ship it
                */
               break;
           }
           count += PAGE_SIZE;
       }

       /* Trim if we went too far
        */
       if (count > sc->sc_count)
           count = sc->sc_count;

       /* Ship it
        */
       DEBUG_PRINT(("icapship %" PRIxPADDR " %d\n",phys,count), DEBUG_XFERS);
       sc->sc_dp->SizeAndFlags = fl | count;
       sc->sc_dp->BufferAddressHi32 = 0; /* BUGBUG 64bit */
       sc->sc_dp->BufferAddressLo32 = phys; /* this pushes the fifo */

       /* Adjust pointers and continue
        */
       sc->sc_data  += count;
       sc->sc_count -= count;

       if (sc->sc_count <= 0)
           break;
   }
}

/*
* Interrupt handler
*/
static int
icap_ebus_intr(void *cookie, void *f)
{
       struct icap_softc *sc = cookie;
   struct buf *bp = sc->sc_bp;
       u_int32_t isr, saf = 0, hi, lo;

       isr = sc->sc_dp->Control;

       DEBUG_PRINT(("i %x\n",isr), DEBUG_INTR);

   /* Make sure there is an interrupt and that we should take it
    */
       if ((isr & (ICAPC_INTEN|ICAPC_DONE)) != (ICAPC_INTEN|ICAPC_DONE))
               return (0);

   /* Pull out all completed buffers
    */
   while ((isr & ICAPC_OF_EMPTY) == 0) {

       if (isr & ICAPC_ERROR) {
           printf("%s: internal error (%x)\n", device_xname(sc->sc_dev),isr);
           icap_reset(sc);
           if (bp) {
               bp->b_error = EIO;
               icapstart(sc);
           }
           return (1);
       }

       /* Beware, order matters */
       saf = sc->sc_dp->SizeAndFlags;
       hi  = sc->sc_dp->BufferAddressHi32; /* BUGBUG 64bit */
       lo  = sc->sc_dp->BufferAddressLo32; /* this pops the fifo */
       __USE(hi);
       __USE(lo);

       /* Say its done that much (and sanity)
        */
       if (bp) {
           size_t count = saf & ICAPS_S_MASK;
           /* more sanity */
           if (count > bp->b_resid)
               count = bp->b_resid;
           bp->b_resid -= count;
       }

       /* More? */
       isr = sc->sc_dp->Control;
   }

   /* Did we pop at least one */
   if (saf)
       icapstart(sc);

   return (1);
}

/*
* HW (re)Initialization
*/
static void
icap_reset(struct icap_softc *sc)
{
       DEBUG_PRINT(("icap_reset %x\n",sc->sc_dp->Control), DEBUG_STATUS);
   sc->sc_dp->Control = ICAPC_RESET;
   DELAY(2);
   sc->sc_dp->Control = ICAPC_INTEN;
}

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