/* $NetBSD: jensenio.c,v 1.25 2025/10/19 20:35:01 thorpej Exp $ */

/*-
 * Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe.
 *
 * 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.
 */

/*
 * Driver for the Jensen I/O bus.
 *
 * The Jensen I/O `bus' is comprised of two things:
 *
 *      - VLSI VL82C106 junk I/O chip
 *      - Intel EISA bus interface
 *
 * Access to the 82C106 is different than to the rest of EISA space, even
 * though it is a single address space.
 */

#include <sys/cdefs.h>                  /* RCS ID & Copyright macro defns */

__KERNEL_RCSID(0, "$NetBSD: jensenio.c,v 1.25 2025/10/19 20:35:01 thorpej Exp $");

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

#include <machine/autoconf.h>

#include <dev/eisa/eisavar.h>

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

#include <alpha/jensenio/jensenioreg.h>
#include <alpha/jensenio/jenseniovar.h>

#include "locators.h"

#include "eisa.h"

/*
 * The devices built-in to the VLSI VL82C106 junk I/O chip.
 */
static const struct jensenio_dev {
        const char *jd_name;            /* device name */
        bus_addr_t jd_ioaddr;           /* I/O space address */
        int jd_irq[2];                  /* Jensen IRQs */
} jensenio_devs[] = {
        { "pckbc",      IO_KBD,         { 0x980, 0x990 } },
        { "com",        IO_COM1,        { 0x900, -1 } },
        { "com",        IO_COM2,        { 0x920, -1 } },
        { "lpt",        IO_LPT3,        { 1, -1 } },
        { "mcclock",    0x170,          { -1, -1 } },
        { NULL,         0,              { -1, -1 } },
};

static int      jensenio_match(device_t, cfdata_t, void *);
static void     jensenio_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(jensenio, 0, jensenio_match, jensenio_attach, NULL, NULL);

static int      jensenio_print(void *, const char *);

static int      jensenio_attached;

struct jensenio_config jensenio_configuration;

static void     jensenio_eisa_attach_hook(device_t, device_t,
                    struct eisabus_attach_args *);
static int      jensenio_eisa_maxslots(void *);

static void     jensenio_isa_attach_hook(device_t, device_t,
                    struct isabus_attach_args *);

static void     jensenio_isa_detach_hook(isa_chipset_tag_t, device_t);

/*
 * Set up the Jensen's function pointers.
 */
void
jensenio_init(struct jensenio_config *jcp)
{

        /*
         * Initialize the Host Address Extension register to 0
         * (the firmware should have already done this).  We will
         * disallow mapping of any device who's address would
         * require a non-0 HAE.  This should be safe as the final
         * draft of the Jensen system specification states that
         * applications should follow this little rule.
         *
         * There's a good reason for this; actually using HAE would
         * require a mutex around *every* EISA cycle!  Gross!
         */
        REGVAL(JENSEN_HAE) = 0;
        alpha_mb();

        if (jcp->jc_initted == 0) {
                /* don't do these twice since they set up extents */
                jensenio_bus_io_init(&jcp->jc_eisa_iot, jcp);
                jensenio_bus_intio_init(&jcp->jc_internal_iot, jcp);
                jensenio_bus_mem_init(&jcp->jc_eisa_memt, jcp);
        }
}

static int
jensenio_match(device_t parent, cfdata_t cf, void *aux)
{
        struct mainbus_attach_args *ma = aux;

        if (strcmp(ma->ma_name, cf->cf_name) != 0)
                return (0);

        /* There can be only one. */
        if (jensenio_attached)
                return (0);

        return (1);
}

static void
jensenio_attach(device_t parent, device_t self, void *aux)
{
        struct jensenio_attach_args ja;
        struct jensenio_config *jcp = &jensenio_configuration;
        int i;
        int locs[JENSENIOCF_NLOCS];

        printf("\n");

        jensenio_attached = 1;

        /*
         * Done once at console init time, but we might need to do
         * additional work this time.
         */
        jensenio_init(jcp);

        /*
         * Initialize DMA.
         */
        jensenio_dma_init(jcp);

        /*
         * Initialize interrupts.
         */
        jensenio_intr_init(jcp);

        /*
         * First attach all of the built-in devices.
         */
        for (i = 0; jensenio_devs[i].jd_name != NULL; i++) {
                ja.ja_name = jensenio_devs[i].jd_name;
                ja.ja_ioaddr = jensenio_devs[i].jd_ioaddr;
                ja.ja_irq[0] = jensenio_devs[i].jd_irq[0];
                ja.ja_irq[1] = jensenio_devs[i].jd_irq[1];

                ja.ja_iot = &jcp->jc_internal_iot;
                ja.ja_ec = &jcp->jc_ec;

                locs[JENSENIOCF_PORT] = jensenio_devs[i].jd_ioaddr;
                config_found(self, &ja, jensenio_print,
                    CFARGS(.submatch = config_stdsubmatch,
                           .iattr = "jensenio",
                           .locators = locs));
        }

        /*
         * Attach the EISA bus.
         */
        jcp->jc_ec.ec_attach_hook = jensenio_eisa_attach_hook;
        jcp->jc_ec.ec_maxslots = jensenio_eisa_maxslots;

        ja.ja_eisa.eba_iot = &jcp->jc_eisa_iot;
        ja.ja_eisa.eba_memt = &jcp->jc_eisa_memt;
        ja.ja_eisa.eba_dmat = &jcp->jc_dmat_eisa;
        ja.ja_eisa.eba_ec = &jcp->jc_ec;
        eisabus_attach(self, &ja.ja_eisa);

        /*
         * Attach the ISA bus.
         */
        jcp->jc_ic.ic_attach_hook = jensenio_isa_attach_hook;
        jcp->jc_ic.ic_detach_hook = jensenio_isa_detach_hook;

        ja.ja_isa.iba_iot = &jcp->jc_eisa_iot;
        ja.ja_isa.iba_memt = &jcp->jc_eisa_memt;
        ja.ja_isa.iba_dmat = &jcp->jc_dmat_isa;
        ja.ja_isa.iba_ic = &jcp->jc_ic;
        isabus_attach(self, &ja.ja_isa);
}

static int
jensenio_print(void *aux, const char *pnp)
{
        struct jensenio_attach_args *ja = aux;

        if (pnp != NULL)
                aprint_normal("%s at %s", ja->ja_name, pnp);

        aprint_normal(" port 0x%lx", ja->ja_ioaddr);

        return (UNCONF);
}

static void
jensenio_eisa_attach_hook(device_t parent, device_t self,
    struct eisabus_attach_args *eba)
{

#if NEISA > 0
        /*
         * Jensen's EISA config info is sparse, and is mapped at a
         * different location that on other EISA systems.
         */
        eisa_config_stride = 0x200;
        eisa_config_addr = JENSEN_FEPROM1;
        eisa_init(eba->eba_ec);
#endif
}

static int
jensenio_eisa_maxslots(void *v)
{

        return (8);     /* jensen seems to have only 8 valid slots */
}

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

        /* Nothing to do. */
}

static void
jensenio_isa_detach_hook(isa_chipset_tag_t ic, device_t self)
{

        /* Nothing to do. */
}