/*      $NetBSD: mainbus.c,v 1.21 2026/05/10 14:56:39 tls Exp $ */

/*
 * Copyright 2002 Wasabi Systems, Inc.
 * All rights reserved.
 *
 * Written by Simon Burge for Wasabi Systems, Inc.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed for the NetBSD Project by
 *      Wasabi Systems, Inc.
 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
 *    or promote products derived from this software without specific prior
 *    written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``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 WASABI SYSTEMS, INC
 * 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: mainbus.c,v 1.21 2026/05/10 14:56:39 tls Exp $");

#include "opt_pci.h"

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

#include <dev/pci/pcivar.h>
#if defined(PCI_NETBSD_CONFIGURE)
#include <dev/pci/pciconf.h>
#endif

#include <mips/cache.h>
#include <mips/cpuregs.h>

#include <evbmips/malta/autoconf.h>
#include <evbmips/malta/maltareg.h>
#include <evbmips/malta/maltavar.h>

#if defined(PCI_NETBSD_ENABLE_IDE)
#include <dev/pci/pciide_piix_reg.h>
#endif /* PCI_NETBSD_ENABLE_IDE */

#include "locators.h"
#include "pci.h"

static int      mainbus_match(device_t, cfdata_t, void *);
static void     mainbus_attach(device_t, device_t, void *);
static int      mainbus_submatch(device_t, cfdata_t, const int *, void *);
static int      mainbus_print(void *, const char *);

CFATTACH_DECL_NEW(mainbus, 0,
    mainbus_match, mainbus_attach, NULL, NULL);

/* There can be only one. */
bool mainbus_found;

struct mainbusdev {
        const char *md_name;
        bus_addr_t md_addr;
        int md_intr;
};

const struct mainbusdev mainbusdevs[] = {
        { "cpu",                -1,                     -1 },
        { "gt",                 MALTA_CORECTRL_BASE,    -1 },
        { "com",                MALTA_CBUSUART,         MALTA_CBUSUART_INTR },
        { "i2c",                MALTA_I2C_BASE,         -1 },
        { "gpio",               MALTA_GPIO_BASE,        -1 },
        { NULL,                 0,                      0 },
};

#define PCI_IO_START    0x00001000
#define PCI_IO_END      0x0000efff
#define PCI_IO_SIZE     ((PCI_IO_END - PCI_IO_START) + 1)

#define PCI_MEM_START   MALTA_PCIMEM2_BASE
#define PCI_MEM_SIZE    MALTA_PCIMEM2_SIZE

static int
mainbus_match(device_t parent, cfdata_t match, void *aux)
{

        if (mainbus_found)
                return (0);

        return (1);
}

static void
mainbus_attach(device_t parent, device_t self, void *aux)
{
        struct mainbus_attach_args ma;
        const struct mainbusdev *md;
#if defined(PCI_NETBSD_ENABLE_IDE) || defined(PCI_NETBSD_CONFIGURE)
        struct malta_config *mcp = &malta_configuration;
        pci_chipset_tag_t pc = &mcp->mc_pc;
#endif

        mainbus_found = true;
        printf("\n");

#if defined(PCI_NETBSD_CONFIGURE)
        struct mips_cache_info * const mci = &mips_cache_info;
        struct pciconf_resources *pcires = pciconf_resource_init();

        pciconf_resource_add(pcires, PCICONF_RESOURCE_IO,
            PCI_IO_START, PCI_IO_SIZE);
        pciconf_resource_add(pcires, PCICONF_RESOURCE_MEM,
            PCI_MEM_START, PCI_MEM_SIZE);

        pci_configure_bus(pc, pcires, 0, mci->mci_dcache_align);
        pciconf_resource_fini(pcires);
#endif /* PCI_NETBSD_CONFIGURE */

#if defined(PCI_NETBSD_ENABLE_IDE)
        /*
         * Perhaps PMON has not enabled the IDE controller.  Easy to
         * fix -- just set the ENABLE bits for each channel in the
         * IDETIM register.  Just clear all the bits for the channel
         * except for the ENABLE bits -- the `pciide' driver will
         * properly configure it later.
         */
        pcireg_t idetim = 0;
        if (PCI_NETBSD_ENABLE_IDE & 0x01)
                idetim = PIIX_IDETIM_SET(idetim, PIIX_IDETIM_IDE, 0);
        if (PCI_NETBSD_ENABLE_IDE & 0x02)
                idetim = PIIX_IDETIM_SET(idetim, PIIX_IDETIM_IDE, 1);

        /* pciide0 is pci device 10, function 1 */
        pcitag_t idetag = pci_make_tag(pc, 0, 10, 1);
        pci_conf_write(pc, idetag, PIIX_IDETIM, idetim);
#endif

#if defined(PCI_NETBSD_CONFIGURE)
        /*
         * When booting without firmware (as for direct kernel load
         * under QEMU) we need to configure the PIIX4 (pcib)'s interrupt
         * routing ourselves.  For simplicitly, we rely on our
         * change to the Gallileo code which uses IRQ 10 for everything
         * if YAMON_IRQ_MAP_BAD.
         */
        pcitag_t isabtag = pci_make_tag(pc, 0, 10, 0);
        pcireg_t pirqrc = 10 | (10 << 8) | (10 << 16) | (10 << 24);
        pci_conf_write(pc, isabtag, 0x60, pirqrc);      /* 0x60 is PIRQRC */
#endif

        for (md = mainbusdevs; md->md_name != NULL; md++) {
                ma.ma_name = md->md_name;
                ma.ma_addr = md->md_addr;
                ma.ma_intr = md->md_intr;
                config_found(self, &ma, mainbus_print,
                    CFARGS(.submatch = mainbus_submatch));
        }
}

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

        if (cf->cf_loc[MAINBUSCF_ADDR] != MAINBUSCF_ADDR_DEFAULT &&
            cf->cf_loc[MAINBUSCF_ADDR] != ma->ma_addr)
                return (0);

        return (config_match(parent, cf, aux));
}

static int
mainbus_print(void *aux, const char *pnp)
{
        struct mainbus_attach_args *ma = aux;

        if (pnp != 0)
                return QUIET;

        if (pnp)
                aprint_normal("%s at %s", ma->ma_name, pnp);
        if (ma->ma_addr != MAINBUSCF_ADDR_DEFAULT)
                aprint_normal(" addr 0x%lx", ma->ma_addr);

        return (UNCONF);
}