/*      $NetBSD: isa_machdep.c,v 1.42 2022/09/25 12:41:46 andvar Exp $  */

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by UCHIYAMA Yasushi.
 *
 * 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: isa_machdep.c,v 1.42 2022/09/25 12:41:46 andvar Exp $");

#include "opt_vr41xx.h"

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

#include <dev/isa/isavar.h>
#include <dev/isa/isareg.h>

#include <machine/platid.h>
#include <machine/platid_mask.h>
#include <machine/bus.h>
#include <machine/bus_space_hpcmips.h>
#include <machine/debug.h>

#include <dev/hpc/hpciovar.h>

#include <hpcmips/vr/vripif.h>

#include "locators.h"

#define VRISADEBUG

#ifdef VRISADEBUG
#ifndef VRISADEBUG_CONF
#define VRISADEBUG_CONF 0
#endif /* VRISADEBUG_CONF */
int vrisa_debug = VRISADEBUG_CONF;
#define DPRINTF(arg) if (vrisa_debug) printf arg;
#define DBITDISP(mask) if (vrisa_debug) dbg_bit_print(mask);
#define VPRINTF(arg) if (bootverbose || vrisa_debug) printf arg;
#else /* VRISADEBUG */
#define DPRINTF(arg)
#define DBITDISP(mask)
#define VPRINTF(arg) if (bootverbose) printf arg;
#endif /* VRISADEBUG */

/*
 * interrupt no. encoding:
 *
 * 0x0000000f ISA IRQ#
 * 0x00ff0000 GPIO port#
 * 0x01000000 interrupt signal hold/through     (1:hold/0:though)
 * 0x02000000 interrupt detection level         (1:low /0:high  )
 * 0x04000000 interrupt detection trigger       (1:edge/0:level )
 */
#define INTR_IRQ(i)     (((i)>> 0) & 0x0f)
#define INTR_PORT(i)    (((i)>>16) & 0xff)
#define INTR_MODE(i)    (((i)>>24) & 0x07)
#define INTR_NIRQS      16

int     vrisabprint(void *, const char *);
int     vrisabmatch(device_t, cfdata_t, void *);
void    vrisabattach(device_t, device_t, void *);

struct vrisab_softc {
        hpcio_chip_t sc_hc;
        int sc_intr_map[INTR_NIRQS]; /* ISA <-> GIU interrupt line mapping */
        struct hpcmips_isa_chipset sc_isa_ic;
};

CFATTACH_DECL_NEW(vrisab, sizeof(struct vrisab_softc),
    vrisabmatch, vrisabattach, NULL, NULL);

#ifdef DEBUG_FIND_PCIC
#include <mips/cpuregs.h>
#warning DEBUG_FIND_PCIC
static void __find_pcic(void);
#endif

#ifdef DEBUG_FIND_COMPORT
#include <mips/cpuregs.h>
#include <dev/ic/ns16550reg.h>
#include <dev/ic/comreg.h>
#warning DEBUG_FIND_COMPORT
static void __find_comport(void);
#endif

int
vrisabmatch(device_t parent, cfdata_t match, void *aux)
{
        struct hpcio_attach_args *haa = aux;
        platid_mask_t mask;
        int n;

        if (strcmp(haa->haa_busname, match->cf_name))
                return (0);

        if (match->cf_loc[HPCIOIFCF_PLATFORM] == HPCIOIFCF_PLATFORM_DEFAULT) 
                return (1);

        mask = PLATID_DEREF(match->cf_loc[HPCIOIFCF_PLATFORM]);
        if ((n = platid_match(&platid, &mask)) != 0)
                return (n + 2);

        return (0);
}

void
vrisabattach(device_t parent, device_t self, void *aux)
{
        struct hpcio_attach_args *haa = aux;
        struct vrisab_softc *sc = device_private(self);
        struct isabus_attach_args iba;
        struct bus_space_tag_hpcmips *iot, *memt;
        bus_addr_t offset;
        int i;
    
        sc->sc_hc = (*haa->haa_getchip)(haa->haa_sc, VRIP_IOCHIP_VRGIU);
        sc->sc_isa_ic.ic_sc = sc;

        iba.iba_ic      = &sc->sc_isa_ic;
        iba.iba_dmat    = 0; /* XXX not yet */

        /* Allocate ISA memory space */
        memt = hpcmips_alloc_bus_space_tag();
        offset = device_cfdata(self)->cf_loc[VRISABIFCF_ISAMEMOFFSET];
        hpcmips_init_bus_space(memt,
            (struct bus_space_tag_hpcmips *)haa->haa_iot, "ISA mem",
            VR_ISA_MEM_BASE + offset, VR_ISA_MEM_SIZE - offset);
        iba.iba_memt = &memt->bst;

        /* Allocate ISA port space */
        iot = hpcmips_alloc_bus_space_tag();
        offset = device_cfdata(self)->cf_loc[VRISABIFCF_ISAPORTOFFSET];
        hpcmips_init_bus_space(iot,
            (struct bus_space_tag_hpcmips *)haa->haa_iot, "ISA port",
            VR_ISA_PORT_BASE + offset, VR_ISA_PORT_SIZE - offset);
        iba.iba_iot = &iot->bst;

#ifdef DEBUG_FIND_PCIC
#warning DEBUG_FIND_PCIC
        __find_pcic();
#else
        /* Initialize ISA IRQ <-> GPIO mapping */
        for (i = 0; i < INTR_NIRQS; i++)
                sc->sc_intr_map[i] = -1;
        printf(": ISA port %#x-%#x mem %#x-%#x\n",
            iot->base, iot->base + iot->size,
            memt->base, memt->base + memt->size);
        config_found(self, &iba, vrisabprint, CFARGS_NONE);
#endif

#ifdef DEBUG_FIND_COMPORT
#warning DEBUG_FIND_COMPORT
        __find_comport();
#endif
}

int
vrisabprint(void *aux, const char *pnp)
{
        if (pnp)
                return (QUIET);

        return (UNCONF);
}

void
isa_attach_hook(device_t parent, device_t self,
    struct isabus_attach_args *iba)
{

}

void
isa_detach_hook(isa_chipset_tag_t ic, device_t self)
{
}

const struct evcnt *
isa_intr_evcnt(isa_chipset_tag_t ic, int irq)
{

        /* XXX for now, no evcnt parent reported */
        return (NULL);
}

void *
isa_intr_establish(isa_chipset_tag_t ic, int intr, int type, int level,
    int (*ih_fun)(void*), void *ih_arg)
{
        struct vrisab_softc *sc = ic->ic_sc;
        int port, irq, mode;

        static int intr_modes[8] = {
                HPCIO_INTR_LEVEL_HIGH_THROUGH,
                HPCIO_INTR_LEVEL_HIGH_HOLD,
                HPCIO_INTR_LEVEL_LOW_THROUGH,
                HPCIO_INTR_LEVEL_LOW_HOLD,
                HPCIO_INTR_EDGE_THROUGH,
                HPCIO_INTR_EDGE_HOLD,
                HPCIO_INTR_EDGE_THROUGH,
                HPCIO_INTR_EDGE_HOLD,
        };
#ifdef VRISADEBUG
        static const char* intr_mode_names[8] = {
                "level high through",
                "level high hold",
                "level low through",
                "level low hold",
                "edge through",
                "edge hold",
                "edge through",
                "edge hold",
        };
#endif /* VRISADEBUG */
        /* 
         * ISA IRQ <-> GPIO port mapping
         */
        irq = INTR_IRQ(intr);
        if (sc->sc_intr_map[irq] != -1) {
                /* already mapped */
                intr = sc->sc_intr_map[irq];
        } else {
                /* not mapped yet */
                sc->sc_intr_map[irq] = intr; /* Register it */
        }
        mode = INTR_MODE(intr);
        port = INTR_PORT(intr);

        VPRINTF(("ISA IRQ %d -> %s port %d, %s\n",
            irq, sc->sc_hc->hc_name, port, intr_mode_names[mode]));

        /* Call Vr routine */
        return (hpcio_intr_establish(sc->sc_hc, port, intr_modes[mode],
            ih_fun, ih_arg));
}

void
isa_intr_disestablish(isa_chipset_tag_t ic, void *arg)
{
        struct vrisab_softc *sc = ic->ic_sc;
        /* Call Vr routine */
        hpcio_intr_disestablish(sc->sc_hc, arg);
}

int
isa_intr_alloc(isa_chipset_tag_t ic, int mask, int type, int *irq)
{
        /* XXX not coded yet. this is temporary XXX */
        DPRINTF(("isa_intr_alloc:"));
        DBITDISP(mask);
        *irq = (ffs(mask) -1); /* XXX */

        return (0);
}

#ifdef DEBUG_FIND_PCIC
#warning DEBUG_FIND_PCIC
static void
__find_pcic(void)
{
        int i, j, step, found;
        u_int32_t addr;
        u_int8_t reg;
        int __read_revid (u_int32_t port) 
            {
                    addr = MIPS_PHYS_TO_KSEG1(i + port);
                    printf("%#x\r", i);
                    for (found = 0, j = 0; j < 0x100; j += 0x40) {
                            *((volatile u_int8_t *)addr) = j;
                            reg = *((volatile u_int8_t *)(addr + 1));
#ifdef DEBUG_FIND_PCIC_I82365SL_ONLY
                            if (reg == 0x82 || reg == 0x83) {
#else
                            if ((reg & 0xc0) == 0x80) {
#endif
                                            found++;
                            }
                            if (found)
                                    printf("\nfound %d socket at %#x"
                                        "(base from %#x)\n", found, addr,
                                        i + port - VR_ISA_PORT_BASE);
                    }
            }
        step = 0x1000000;
        printf("\nFinding PCIC. Trying ISA port %#x-%#x step %#x\n", 
            VR_ISA_PORT_BASE, VR_ISA_PORT_BASE + VR_ISA_PORT_SIZE, step);
        for (i = VR_ISA_PORT_BASE; i < VR_ISA_PORT_BASE+VR_ISA_PORT_SIZE;
            i+= step) {
                __read_revid (0x3e0);
                __read_revid (0x3e2);
        }
}
#endif /* DEBUG_FIND_PCIC */


#ifdef DEBUG_FIND_COMPORT
#warning DEBUG_FIND_COMPORT

static int probe_com(u_int32_t);

static int
probe_com(u_int32_t port_addr)
{
        u_int32_t addr;
        u_int8_t ubtmp1, ubtmp2;

        addr = MIPS_PHYS_TO_KSEG1(port_addr);

        *((volatile u_int8_t *)(addr + com_cfcr)) = LCR_8BITS;
        *((volatile u_int8_t *)(addr + com_iir)) = 0;

        ubtmp1 = *((volatile u_int8_t *)(addr + com_cfcr));
        ubtmp2 = *((volatile u_int8_t *)(addr + com_iir));

        if ((ubtmp1 != LCR_8BITS) || ((ubtmp2 & 0x38) != 0)) {
                return (0);
        }

        return (1);
}

static void
__find_comport(void)
{
        int found;
        u_int32_t port, step;

        found = 0;
        step = 0x08;

        printf("Searching COM port. Trying ISA port %#x-%#x step %#x\n",
            VR_ISA_PORT_BASE, VR_ISA_PORT_BASE + VR_ISA_PORT_SIZE - 1, step );

        for (port = VR_ISA_PORT_BASE;
            port < (VR_ISA_PORT_BASE + VR_ISA_PORT_SIZE); port += step){
                if (probe_com(port)) {
                        found++;
                        printf("found %d at %#x\n", found, port);
                }
        }
}
#endif /* DEBUG_FIND_COMPORT */