/*      $NetBSD: vme.c,v 1.19 2021/08/07 16:19:06 thorpej Exp $ */

/*-
 * Copyright (c) 1996 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Gordon W. Ross.
 *
 * 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>
__KERNEL_RCSID(0, "$NetBSD: vme.c,v 1.19 2021/08/07 16:19:06 thorpej Exp $");

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

#include <uvm/uvm_extern.h>

#define _SUN68K_BUS_DMA_PRIVATE
#include <machine/autoconf.h>
#include <machine/bus.h>
#include <machine/dvma.h>
#include <machine/pmap.h>

#include <sun3/sun3x/vme.h>

/* Does this machine have a VME bus? */
extern int cpu_has_vme;

/*
 * Convert vme unit number to bus type,
 * but only for supported bus types.
 * (See autoconf.h and vme.h)
 */
#define VME_UNITS       6
static const struct {
        int bustype;
        const char *name;
        int pmtype;
        vaddr_t base;
        vaddr_t mask;
} vme_info[VME_UNITS] = {
        { BUS_VME16D16, "A16/D16", PMAP_VME16, VME16_BASE, VME16_MASK },
        { BUS_VME16D32, "A16/D32", PMAP_VME32, VME16_BASE, VME16_MASK },
        { BUS_VME24D16, "A24/D16", PMAP_VME16, VME24_BASE, VME24_MASK },
        { BUS_VME24D32, "A24/D32", PMAP_VME32, VME24_BASE, VME24_MASK },
        { BUS_VME32D16, "A32/D16", PMAP_VME16, VME32_BASE, VME32_MASK },
        { BUS_VME32D32, "A32/D32", PMAP_VME32, VME32_BASE, VME32_MASK },
};

static int  vme_match(device_t, cfdata_t, void *);
static void vme_attach(device_t, device_t, void *);

struct vme_softc {
        device_t        sc_dev;
        bus_space_tag_t sc_bustag;
        bus_dma_tag_t   sc_dmatag;
        int             sc_bustype;
};

CFATTACH_DECL_NEW(vme, sizeof(struct vme_softc),
    vme_match, vme_attach, NULL, NULL);

static int vme_bus_map(bus_space_tag_t, bus_type_t, bus_addr_t, bus_size_t,
    int, vaddr_t, bus_space_handle_t *);
static paddr_t vme_bus_mmap(bus_space_tag_t, bus_type_t, bus_addr_t,
    off_t, int, int);
static int vme_dmamap_load(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t,
    struct proc *, int);

static struct sun68k_bus_space_tag vme_space_tag = {
        NULL,                           /* cookie */
        NULL,                           /* parent bus space tag */
        vme_bus_map,                    /* bus_space_map */
        NULL,                           /* bus_space_unmap */
        NULL,                           /* bus_space_subregion */
        NULL,                           /* bus_space_barrier */
        vme_bus_mmap,                   /* bus_space_mmap */
        NULL,                           /* bus_intr_establish */
        NULL,                           /* bus_space_peek_N */
        NULL                            /* bus_space_poke_N */
};

static struct sun68k_bus_dma_tag vme_dma_tag;

static int
vme_match(device_t parent, cfdata_t cf, void *aux)
{
        struct confargs *ca = aux;
        int unit;

        if (cpu_has_vme == 0)
                return 0;

        unit = cf->cf_unit;
        if (unit >= VME_UNITS)
                return 0;

        if (ca->ca_bustype != vme_info[unit].bustype)
                return 0;

        return 1;
}

static void
vme_attach(device_t parent, device_t self, void *args)
{
        struct confargs *ca = aux;
        struct vme_softc *sc = device_private(self);
        struct confargs vmea;
        int unit;

        sc->sc_dev = self;

        unit = device_unit(self);
        aprint_normal(": (%s)\n", vme_info[unit].name);

        sc->sc_bustag = ca->ca_bustag;
        sc->sc_dmatag = ca->ca_dmatag;
        sc->sc_bustype = unit;

        vme_space_tag.cookie = sc;
        vme_space_tag.parent = sc->sc_bustag;

        vme_dma_tag = *sc->sc_dmatag;
        vme_dma_tag._cookie = sc;
        vme_dma_tag._dmamap_load = vme_dmamap_load;

        vmea = *ca;
        vmea.ca_bustag = &vme_space_tag;
        vmea.ca_dmatag = &vme_dma_tag;

        /* We know ca_bustype == BUS_VMExx */
        config_search(self, args,
            CFARGS(.search = bus_scan));
}

int
vme_bus_map(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr,
    bus_size_t size, int flags, vaddr_t vaddr, bus_space_handle_t *hp)
{
        struct vme_softc *sc = t->cookie;
        paddr_t pa;
        int bustype, pmtype;

        bustype = sc->sc_bustype;
        pa = paddr;
        pa &= vme_info[bustype].mask;
        pa |= vme_info[bustype].base;
        pmtype = vme_info[bustype].pmtype;

        return bus_space_map2(sc->sc_bustag, pmtype, pa, size,
            flags | _SUN68K_BUS_MAP_USE_PROM, vaddr, hp);
}

paddr_t
vme_bus_mmap(bus_space_tag_t t, bus_type_t btype, bus_addr_t paddr, off_t off,
    int prot, int flags)
{
        struct vme_softc *sc = t->cookie;
        paddr_t pa;
        int bustype, pmtype;

        bustype = sc->sc_bustype;
        pa = paddr;
        pa &= vme_info[bustype].mask;
        pa |= vme_info[bustype].base;
        pmtype = vme_info[bustype].pmtype;

        return bus_space_mmap2(sc->sc_bustag, pmtype, pa, off, prot, flags);
}

static int
vme_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
    bus_size_t buflen, struct proc *p, int flags)
{
        int error;

        error = _bus_dmamap_load(t, map, buf, buflen, p, flags);
        if (error == 0)
                map->dm_segs[0].ds_addr &= DVMA_VME_SLAVE_MASK;
        return error;
}