/*      $NetBSD: pdc.c,v 1.4 2019/01/08 19:14:08 christos Exp $ */

/*      $OpenBSD: pdc.c,v 1.10 1999/05/06 02:27:44 mickey Exp $ */

/*
 * Copyright (c) 1998-2004 Michael Shalayeff
 * 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.
 *
 * 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 OR HIS RELATIVES 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 MIND, 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.
 */
/*
 * Copyright 1996 1995 by Open Software Foundation, Inc.
 *              All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appears in all copies and
 * that both the copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
/*
 * Copyright (c) 1990 mt Xinu, Inc.  All rights reserved.
 * Copyright (c) 1990 University of Utah.  All rights reserved.
 *
 * This file may be freely distributed in any form as long as
 * this copyright notice is included.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      Utah $Hdr: pdc.c 1.8 92/03/14$
 */

#include <sys/param.h>
#include <sys/time.h>
#include "libsa.h"
#include <sys/reboot.h>
#include <sys/disklabel.h>

#include <machine/trap.h>
#include <machine/pdc.h>
#include <machine/iomod.h>
#include <machine/nvm.h>
#include <machine/cpufunc.h>

#include "dev_hppa.h"

/*
 * Interface routines to initialize and access the PDC.
 */

pdcio_t pdc;
int     pdcbuf[64] PDC_ALIGNMENT;/* PDC return buffer */
struct  stable_storage sstor;   /* contents of Stable Storage */
int     sstorsiz;               /* size of Stable Storage */
struct bootdata bd;
int bdsize = sizeof(struct bootdata);

/*
 * Initialize PDC and related variables.
 */
void
pdc_init(void)
{
        int err;

        /*
         * Initialize important global variables (defined above).
         */
        pdc = (pdcio_t)PAGE0->mem_pdc;

        err = (*pdc)(PDC_STABLE, PDC_STABLE_SIZE, pdcbuf, 0, 0);
        if (err >= 0) {
                sstorsiz = uimin(pdcbuf[0],sizeof(sstor));
                err = (*pdc)(PDC_STABLE, PDC_STABLE_READ, 0, &sstor, sstorsiz);
        }

        /*
         * Now that we (may) have an output device, if we encountered
         * an error reading Stable Storage (above), let them know.
         */
#ifdef DEBUG
        if (debug && err)
                printf("Stable storage PDC_STABLE Read Ret'd %d\n", err);
#endif

        /*
         * Clear the FAULT light (so we know when we get a real one)
         */
        (void) (*pdc)(PDC_CHASSIS, PDC_CHASSIS_DISP,
                      PDC_OSTAT(PDC_OSTAT_BOOT) | 0xCEC0);
}

/*
 * Generic READ/WRITE through IODC.  Takes pointer to PDC device
 * information, returns (positive) number of bytes actually read or
 * the (negative) error condition, or zero if at "EOF".
 */
int
iodcstrategy(void *devdata, int rw, daddr_t blk, size_t size, void *buf,
    size_t *rsize)
{
        struct hppa_dev *dp = devdata;
        struct pz_device *pzdev = dp->pz_dev;
        int offset, xfer, ret;

#ifdef PDCDEBUG
        if (debug)
                printf("iodcstrategy(%p, %s, %u, %u, %p, %p)\n", devdata,
                       rw==F_READ?"READ":"WRITE", (unsigned) blk, (unsigned) size, buf, rsize);

        if (debug > 1)
                PZDEV_PRINT(pzdev);
#endif

        blk <<= DEV_BSHIFT;
        blk += dp->part_off;
        if ((pzdev->pz_class & PCL_CLASS_MASK) == PCL_SEQU) {
                /* rewind and re-read to seek */
                if (blk < dp->last_blk) {
#ifdef PDCDEBUG
                        if (debug)
                                printf("iodc: rewind ");
#endif
                        twiddle();
                        if ((ret = (pzdev->pz_iodc_io)(pzdev->pz_hpa,
                                IODC_IO_READ, pzdev->pz_spa, pzdev->pz_layers,
                                pdcbuf, 0, dp->buf, 0, 0)) < 0) {
#ifdef DEBUG
                                if (debug)
                                        printf("IODC_IO: %d\n", ret);
#endif
                                return (EIO);
                        } else {
                                dp->last_blk = 0;
                                dp->last_read = 0;
                        }
                }

#ifdef PDCDEBUG
                if (debug)
                        printf("seek %d ", (int) dp->last_blk);
#endif
                for (; (dp->last_blk + dp->last_read) <= blk;
                     dp->last_read = ret) {
                        twiddle();
                        dp->last_blk += dp->last_read;
                        if ((ret = (pzdev->pz_iodc_io)(pzdev->pz_hpa,
                                IODC_IO_READ, pzdev->pz_spa, pzdev->pz_layers,
                                pdcbuf, (unsigned) dp->last_blk, dp->buf, IODC_MAXIOSIZ,
                                IODC_MAXIOSIZ)) < 0) {
#ifdef DEBUG
                                if (debug)
                                        printf("IODC_IO: %d\n", ret);
#endif
                                return (EIO);
                        }
                        if ((ret = pdcbuf[0]) == 0)
                                break;
#ifdef PDCDEBUG
                        if (debug)
                                printf("-");
#endif
                }
#ifdef PDCDEBUG
                if (debug)
                        printf("> %d[%d]\n", (int)dp->last_blk, (int)dp->last_read);
#endif
        }

        xfer = 0;
        /* see if we can scratch anything from buffer */
        if (dp->last_blk <= blk && (dp->last_blk + dp->last_read) > blk) {
                twiddle();
                offset = blk - dp->last_blk;
                xfer = uimin(dp->last_read - offset, size);
                size -= xfer;
                blk += xfer;
#ifdef PDCDEBUG
                if (debug)
                        printf("off=%d,xfer=%d,size=%d,blk=%d\n",
                               offset, xfer, (int)size, (int)blk);
#endif
                memcpy(buf, dp->buf + offset, xfer);
                buf = (char *) buf + xfer;
        }

        /*
         * double buffer it all the time, to cache
         */
        for (; size;
            size -= ret, buf = (char *) buf + ret, blk += ret, xfer += ret) {
                twiddle();
                offset = blk & IOPGOFSET;
                if ((ret = (pzdev->pz_iodc_io)(pzdev->pz_hpa,
                                (rw == F_READ? IODC_IO_READ: IODC_IO_WRITE),
                                pzdev->pz_spa, pzdev->pz_layers, pdcbuf,
                                (int)blk - offset, dp->buf, IODC_MAXIOSIZ,
                                IODC_MAXIOSIZ)) < 0) {
#ifdef DEBUG
                        if (debug)
                                printf("iodc_read(%d,%d): %d\n",
                                        (int)blk - offset, IODC_MAXIOSIZ, ret);
#endif
                        if (xfer)
                                break;
                        else
                                return (EIO);
                }
                if ((ret = pdcbuf[0]) <= 0)
                        break;
                dp->last_blk = blk - offset;
                dp->last_read = ret;
                if ((ret -= offset) > size)
                        ret = size;
                memcpy(buf, dp->buf + offset, ret);
#ifdef PDCDEBUG
                if (debug)
                        printf("read %d(%d,%d)@%x ", ret,
                               (int)dp->last_blk, (int)dp->last_read, (u_int)buf);
#endif
            }

#ifdef PDCDEBUG
        if (debug)
                printf("\n");
#endif

        if (rsize)
                *rsize = xfer;
        return (0);
}

/*
 * Find a device with specified unit number
 * (any if unit == -1), and of specified class (PCL_*).
 */
struct pz_device *
pdc_findev(int unit, int class)
{
        static struct pz_device pz;
        int layers[sizeof(pz.pz_layers)/sizeof(pz.pz_layers[0])];
        iodcio_t iodc;
        struct iomod *io;
        int err = 0;

#ifdef  PDCDEBUG
        if (debug)
                printf("pdc_finddev(%d, %x)\n", unit, class);
#endif
        iodc = (iodcio_t)(PAGE0->mem_free + IODC_MAXSIZE);
        io = PAGE0->mem_boot.pz_hpa;

        /* quick hack for boot device */
        if (PAGE0->mem_boot.pz_class == class &&
            (unit == -1 || PAGE0->mem_boot.pz_layers[0] == unit)) {

                bcopy (&PAGE0->mem_boot.pz_dp, &pz.pz_dp, sizeof(pz.pz_dp));
                bcopy (pz.pz_layers, layers, sizeof(layers));
                if ((err = (pdc)(PDC_IODC, PDC_IODC_READ, pdcbuf, io,
                                  IODC_INIT, iodc, IODC_MAXSIZE)) < 0) {
#ifdef DEBUG
                        if (debug)
                                printf("IODC_READ: %d\n", err);
#endif
                        return NULL;
                }
        } else {
                struct pdc_memmap memmap;
                struct iodc_data mptr;
                int i, stp;

                for (i = 0; i < 0xf; i++) {
                        pz.pz_bc[0] = pz.pz_bc[1] =
                        pz.pz_bc[2] = pz.pz_bc[3] = -1;
                        pz.pz_bc[4] = 2;
                        pz.pz_bc[5] = 0;        /* core bus */
                        pz.pz_mod = i;
                        if ((pdc)(PDC_MEMMAP, PDC_MEMMAP_HPA, &memmap,
                                  &pz.pz_dp) < 0)
                                continue;
#ifdef PDCDEBUG
                        if (debug)
                                printf("memap: %d.%d.%d, hpa=%x, mpgs=%x\n",
                                       pz.pz_bc[4], pz.pz_bc[5], pz.pz_mod,
                                       memmap.hpa, memmap.morepages);
#endif
                        io = (struct iomod *) memmap.hpa;

                        if ((err = (pdc)(PDC_IODC, PDC_IODC_READ, &pdcbuf, io,
                                   IODC_DATA, &mptr, sizeof(mptr))) < 0) {
#ifdef DEBUG
                                if (debug)
                                        printf("IODC_DATA: %d\n", err);
#endif
                                continue;
                        }

                        if ((err = (pdc)(PDC_IODC, PDC_IODC_READ, pdcbuf, io,
                                          IODC_INIT, iodc, IODC_MAXSIZE)) < 0) {
#ifdef DEBUG
                                if (debug)
                                        printf("IODC_READ: %d\n", err);
#endif
                                continue;
                        }

                        stp = IODC_INIT_FIRST;
                        do {
                                if ((err = (iodc)(io, stp, io->io_spa, layers,
                                                  pdcbuf, 0, 0, 0, 0)) < 0) {
#ifdef DEBUG
                                        if (debug && err != PDC_ERR_EOD)
                                                printf("IODC_INIT_%s: %d\n",
                                                       stp==IODC_INIT_FIRST?
                                                       "FIRST":"NEXT", err);
#endif
                                        break;
                                }
#ifdef PDCDEBUG
                                if (debug)
                                        printf("[%x,%x,%x,%x,%x,%x], "
                                               "[%x,%x,%x,%x,%x,%x]\n",
                                               pdcbuf[0], pdcbuf[1], pdcbuf[2],
                                               pdcbuf[3], pdcbuf[4], pdcbuf[5],
                                               layers[0], layers[1], layers[2],
                                               layers[3], layers[4], layers[5]);
#endif
                                stp = IODC_INIT_NEXT;

                        } while (pdcbuf[1] != class &&
                                 unit != -1 && unit != layers[0]);

                        if (err >= 0)
                                break;
                }
        }

        if (err >= 0) {
                /* init device */
                if (0  && (err = (iodc)(io, IODC_INIT_DEV, io->io_spa,
                                  layers, pdcbuf, 0, 0, 0, 0)) < 0) {
#ifdef DEBUG
                        if (debug)
                                printf("INIT_DEV: %d\n", err);
#endif
                        return NULL;
                }

                /* read i/o entry code */
                if ((err = (pdc)(PDC_IODC, PDC_IODC_READ, pdcbuf, io,
                                IODC_IO, iodc, IODC_MAXSIZE)) < 0) {
#ifdef DEBUG
                        if (debug)
                                printf("IODC_READ: %d\n", err);
#endif
                        return NULL;
                }

                pz.pz_flags = 0;
                memcpy(pz.pz_layers, layers, sizeof(pz.pz_layers));
                pz.pz_hpa = io;
/* XXX          pz.pz_spa = io->io_spa; */
                pz.pz_iodc_io = iodc;
                pz.pz_class = class;

                return &pz;
        }

        return NULL;
}

static inline void
fall(int c_base, int c_count, int c_loop, int c_stride, int data)
{
        int loop;

        for (; c_count--; c_base += c_stride)
                for (loop = c_loop; loop--; )
                        if (data)
                                fdce(0, c_base);
                        else
                                fice(0, c_base);

}

/*
 * fcacheall - Flush all caches.
 *
 * This routine is just a wrapper around the real cache flush routine.
 */
struct pdc_cache pdc_cacheinfo PDC_ALIGNMENT;

void
fcacheall(void)
{
        int err;

        if ((err = (*pdc)(PDC_CACHE, PDC_CACHE_DFLT, &pdc_cacheinfo)) < 0) {
#ifdef DEBUG
                if (debug)
                        printf("fcacheall: PDC_CACHE failed (%d).\n", err);
#endif
                return;
        }
#if PDCDEBUG
        if (debug)
                printf("pdc_cache:\nic={%u,%x,%x,%u,%u,%u}\n"
                       "dc={%u,%x,%x,%u,%u,%u}\n",
                       pdc_cacheinfo.ic_size, *(u_int*)&pdc_cacheinfo.ic_conf,
                       pdc_cacheinfo.ic_base, pdc_cacheinfo.ic_stride,
                       pdc_cacheinfo.ic_count, pdc_cacheinfo.ic_loop,
                       pdc_cacheinfo.dc_size, *(u_int*)&pdc_cacheinfo.ic_conf,
                       pdc_cacheinfo.dc_base, pdc_cacheinfo.dc_stride,
                       pdc_cacheinfo.dc_count, pdc_cacheinfo.dc_loop);
#endif
        /*
         * Flush the instruction, then data cache.
         */
        fall(pdc_cacheinfo.ic_base, pdc_cacheinfo.ic_count,
             pdc_cacheinfo.ic_loop, pdc_cacheinfo.ic_stride, 0);
        sync_caches();
        fall(pdc_cacheinfo.dc_base, pdc_cacheinfo.dc_count,
             pdc_cacheinfo.dc_loop, pdc_cacheinfo.dc_stride, 1);
        sync_caches();
}