/*      $NetBSD: fhc.c,v 1.11 2022/01/22 11:49:17 thorpej Exp $ */
/*      $OpenBSD: fhc.c,v 1.17 2010/11/11 17:58:23 miod Exp $   */

/*
 * Copyright (c) 2004 Jason L. Wright (jason@thought.net)
 * 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 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: fhc.c,v 1.11 2022/01/22 11:49:17 thorpej Exp $");

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/malloc.h>
#include <sys/kmem.h>
#include <sys/bus.h>

#include <machine/autoconf.h>
#include <machine/openfirm.h>

#include <sparc64/dev/fhcreg.h>
#include <sparc64/dev/fhcvar.h>
#include <sparc64/dev/iommureg.h>

int     fhc_print(void *, const char *);

bus_space_tag_t fhc_alloc_bus_tag(struct fhc_softc *);
int _fhc_bus_map(bus_space_tag_t, bus_addr_t, bus_size_t, int, vaddr_t,
    bus_space_handle_t *);
void *fhc_intr_establish(bus_space_tag_t, int, int,
    int (*)(void *), void *, void (*)(void));
bus_space_handle_t *fhc_find_intr_handle(struct fhc_softc *, int);

void
fhc_attach(struct fhc_softc *sc)
{
        int node0, node;
        u_int32_t ctrl;

        printf(" board %d: %s\n", sc->sc_board,
            prom_getpropstring(sc->sc_node, "board-model"));

        sc->sc_cbt = fhc_alloc_bus_tag(sc);

        sc->sc_ign = sc->sc_board << 1;
        bus_space_write_4(sc->sc_bt, sc->sc_ireg, FHC_I_IGN, sc->sc_ign);
        sc->sc_ign = bus_space_read_4(sc->sc_bt, sc->sc_ireg, FHC_I_IGN);

        ctrl = bus_space_read_4(sc->sc_bt, sc->sc_preg, FHC_P_CTRL);
        if (!sc->sc_is_central)
                ctrl |= FHC_P_CTRL_IXIST;
        ctrl &= ~(FHC_P_CTRL_AOFF | FHC_P_CTRL_BOFF | FHC_P_CTRL_SLINE);
        bus_space_write_4(sc->sc_bt, sc->sc_preg, FHC_P_CTRL, ctrl);
        bus_space_read_4(sc->sc_bt, sc->sc_preg, FHC_P_CTRL);

        /* clear interrupts */
        bus_space_write_4(sc->sc_bt, sc->sc_freg, FHC_F_ICLR, 0);
        bus_space_read_4(sc->sc_bt, sc->sc_freg, FHC_F_ICLR);
        bus_space_write_4(sc->sc_bt, sc->sc_sreg, FHC_S_ICLR, 0);
        bus_space_read_4(sc->sc_bt, sc->sc_sreg, FHC_S_ICLR);
        bus_space_write_4(sc->sc_bt, sc->sc_ureg, FHC_U_ICLR, 0);
        bus_space_read_4(sc->sc_bt, sc->sc_ureg, FHC_U_ICLR);
        bus_space_write_4(sc->sc_bt, sc->sc_treg, FHC_T_ICLR, 0);
        bus_space_read_4(sc->sc_bt, sc->sc_treg, FHC_T_ICLR);

        prom_getprop(sc->sc_node, "ranges", sizeof(struct fhc_range),
            &sc->sc_nrange, (void **)&sc->sc_range);

        devhandle_t selfh = device_handle(sc->sc_dev);
        node0 = firstchild(sc->sc_node);
        for (node = node0; node; node = nextsibling(node)) {
                struct fhc_attach_args fa;

#if 0
                if (!checkstatus(node))
                        continue;
#endif

                bzero(&fa, sizeof(fa));

                fa.fa_node = node;
                fa.fa_bustag = sc->sc_cbt;

                if (fhc_get_string(fa.fa_node, "name", &fa.fa_name)) {
                        printf("can't fetch name for node 0x%x\n", node);
                        continue;
                }
                prom_getprop(node, "reg", sizeof(struct fhc_reg),
                    &fa.fa_nreg, (void **)&fa.fa_reg);
                prom_getprop(node, "interrupts", sizeof(int),
                    &fa.fa_nintr, (void **)&fa.fa_intr);
                prom_getprop(node, "address", sizeof(*fa.fa_promvaddrs),
                    &fa.fa_npromvaddrs, (void **)&fa.fa_promvaddrs);

                (void)config_found(sc->sc_dev, (void *)&fa, fhc_print,
                    CFARGS(.devhandle = prom_node_to_devhandle(selfh, node)));

                if (fa.fa_name != NULL)
                        free(fa.fa_name, M_DEVBUF);
                if (fa.fa_reg != NULL)
                        free(fa.fa_reg, M_DEVBUF);
                if (fa.fa_intr != NULL)
                        free(fa.fa_intr, M_DEVBUF);
                if (fa.fa_promvaddrs != NULL)
                        free(fa.fa_promvaddrs, M_DEVBUF);
        }
}

int
fhc_print(void *args, const char *busname)
{
        struct fhc_attach_args *fa = args;
        char *class;

        if (busname != NULL) {
                printf("\"%s\" at %s", fa->fa_name, busname);
                class = prom_getpropstring(fa->fa_node, "device_type");
                if (*class != '\0')
                        printf(" class %s", class);
        }
        return (UNCONF);
}

int
fhc_get_string(int node, const char *name, char **buf)
{
        int len;

        len = prom_getproplen(node, name);
        if (len < 0)
                return (len);
        *buf = (char *)malloc(len + 1, M_DEVBUF, M_WAITOK);
        if (len != 0)
                prom_getpropstringA(node, name, *buf, len + 1);
        (*buf)[len] = '\0';
        return (0);
}

bus_space_tag_t
fhc_alloc_bus_tag(struct fhc_softc *sc)
{
        struct sparc_bus_space_tag *bt;

        bt = kmem_zalloc(sizeof(*bt), KM_SLEEP);
        bt->cookie = sc;
        bt->parent = sc->sc_bt;
        bt->type = 0;   /* XXX asi? */
        bt->sparc_bus_map = _fhc_bus_map;
        /* XXX bt->sparc_bus_mmap = fhc_bus_mmap; */
        bt->sparc_intr_establish = fhc_intr_establish;
        return (bt);
}

int
_fhc_bus_map(bus_space_tag_t t, bus_addr_t addr, bus_size_t size,
             int flags, vaddr_t unused, bus_space_handle_t *hp)
{
        struct fhc_softc *sc = t->cookie;
        int64_t slot = BUS_ADDR_IOSPACE(addr);
        int64_t offset = BUS_ADDR_PADDR(addr);
        int i;

        if (t->parent == NULL || t->parent->sparc_bus_map == NULL) {
                printf("\n_fhc_bus_map: invalid parent");
                return (EINVAL);
        }

        for (i = 0; i < sc->sc_nrange; i++) {
                bus_addr_t paddr;

                if (sc->sc_range[i].cspace != slot)
                        continue;

                paddr = offset - sc->sc_range[i].coffset;
                paddr += sc->sc_range[i].poffset;
                paddr |= ((bus_addr_t)sc->sc_range[i].pspace << 32);

                return bus_space_map(t->parent, paddr, size, flags, hp);
        }

        return (EINVAL);
}

bus_space_handle_t *
fhc_find_intr_handle(struct fhc_softc *sc, int ino)
{
        switch (FHC_INO(ino)) {
        case FHC_F_INO:
                return &sc->sc_freg;
        case FHC_S_INO:
                return &sc->sc_sreg;
        case FHC_U_INO:
                return &sc->sc_ureg;
        case FHC_T_INO:
                return &sc->sc_treg;
        default:
                break;
        }

        return (NULL);
}

void *
fhc_intr_establish(bus_space_tag_t t, int ihandle, int level,
        int (*handler)(void *), void *arg, void (*fastvec)(void) /* ignored */)
{
        struct fhc_softc *sc = t->cookie;
        volatile u_int64_t *intrmapptr = NULL, *intrclrptr = NULL;
        struct intrhand *ih;
        long vec;
        bus_space_handle_t *hp;
        struct fhc_intr_reg *intrregs;

        hp = fhc_find_intr_handle(sc, ihandle);
        if (hp == NULL) {
                printf(": can't find intr handle\n");
                return (NULL);
        }

        intrregs = bus_space_vaddr(sc->sc_bt, *hp);
        intrmapptr = &intrregs->imap;
        intrclrptr = &intrregs->iclr;
        vec = ((sc->sc_ign << INTMAP_IGN_SHIFT) & INTMAP_IGN) |
            INTINO(ihandle);

        ih = intrhand_alloc();

        ih->ih_ivec = ihandle;

        /* Register the map and clear intr registers */
        ih->ih_map = intrmapptr;
        ih->ih_clr = intrclrptr;

        ih->ih_fun = handler;
        ih->ih_arg = arg;
        ih->ih_pil = level;
        ih->ih_number = vec;

        intr_establish(ih->ih_pil, level != IPL_VM, ih);

        /*
         * XXXX --- we really should use bus_space for this.
         */
        if (intrmapptr != NULL) {
                u_int64_t r;

                r = *intrmapptr;
                r |= INTMAP_V | (CPU_UPAID << INTMAP_TID_SHIFT);
                *intrmapptr = r;
                r = *intrmapptr;
                ih->ih_number |= r & INTMAP_INR;
        }

        return (ih);
}