/*      $NetBSD: agp_apple.c,v 1.9 2026/06/21 17:09:44 andvar Exp $ */

/*-
 * Copyright (c) 2007 Michael Lorenz
 * 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 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: agp_apple.c,v 1.9 2026/06/21 17:09:44 andvar Exp $");
#include <sys/param.h>
#include <sys/agpio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/systm.h>

#include <dev/pci/agpreg.h>
#include <dev/pci/agpvar.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>

#define APPLE_UNINORTH_GART_BASE        0x8c
#define APPLE_UNINORTH_GART_BASE_ADDR   0x90
#define APPLE_UNINORTH_GART_CTRL        0x94
#define APPLE_UNINORTH_GART_INVAL       0x00000001
#define APPLE_UNINORTH_GART_ENABLE      0x00000100
#define APPLE_UNINORTH_GART_2XRESET     0x00010000
#define APPLE_UNINORTH_GART_PERFRD      0x00080000

static u_int32_t agp_apple_get_aperture(struct agp_softc *);
static int agp_apple_set_aperture(struct agp_softc *, u_int32_t);
static int agp_apple_bind_page(struct agp_softc *, off_t, bus_addr_t);
static int agp_apple_unbind_page(struct agp_softc *, off_t);
static void agp_apple_flush_tlb(struct agp_softc *);

static struct agp_methods agp_apple_methods = {
        agp_apple_get_aperture,
        agp_apple_set_aperture,
        agp_apple_bind_page,
        agp_apple_unbind_page,
        agp_apple_flush_tlb,
        agp_generic_enable,
        agp_generic_alloc_memory,
        agp_generic_free_memory,
        agp_generic_bind_memory,
        agp_generic_unbind_memory,
};

struct agp_apple_softc {
        u_int32_t       initial_aperture; /* aperture size at startup */
        struct agp_gatt *gatt;
};

int
agp_apple_attach(device_t parent, device_t self, void *aux)
{
        struct pci_attach_args *pa = aux;
        struct agp_softc *sc = device_private(self);
        struct agp_apple_softc *asc;
        struct agp_gatt *gatt;

        asc = malloc(sizeof *asc, M_AGP, M_WAITOK|M_ZERO);
        sc->as_chipc = asc;
        sc->as_methods = &agp_apple_methods;
        pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
            NULL);

        sc->as_apaddr = 0;
        sc->as_apsize = 8 * 1024 * 1024;
        sc->as_apflags = 0;
        sc->as_pc = pa->pa_pc;
        sc->as_tag = pa->pa_tag;
        sc->as_apt = pa->pa_memt;

        asc->initial_aperture = sc->as_apsize;

        for (;;) {
                gatt = agp_alloc_gatt(sc);
                if (gatt)
                        break;
                sc->as_apsize = sc->as_apsize >> 1;
                if (sc->as_apsize == 0) {
                        aprint_error(": can't set aperture size\n");
                        return ENOMEM;
                }
        }
        asc->gatt = gatt;

        /* Install the gatt. */
        aprint_error("gatt: %08jx %ju MB\n", (uintmax_t)gatt->ag_physical,
            (uintmax_t)(sc->as_apsize >> 20));
        pci_conf_write(pa->pa_pc, pa->pa_tag, APPLE_UNINORTH_GART_BASE,
            (gatt->ag_physical & 0xfffff000) |
            (sc->as_apsize >> 22));

        /* Enable the aperture. */
        pci_conf_write(pa->pa_pc, pa->pa_tag, APPLE_UNINORTH_GART_CTRL,
            APPLE_UNINORTH_GART_ENABLE);
        pci_conf_write(pa->pa_pc, pa->pa_tag, APPLE_UNINORTH_GART_CTRL,
            APPLE_UNINORTH_GART_ENABLE | APPLE_UNINORTH_GART_INVAL);
        pci_conf_write(pa->pa_pc, pa->pa_tag, APPLE_UNINORTH_GART_CTRL,
            APPLE_UNINORTH_GART_ENABLE);
        return 0;
}

static u_int32_t
agp_apple_get_aperture(struct agp_softc *sc)
{
#if 0
        u_int32_t apsize = 0;

        aprint_error("%s: ", __func__);
        apsize = pci_conf_read(sc->as_pc, sc->as_tag,
            APPLE_UNINORTH_GART_BASE) & 0x0000ffff;
        aprint_error("%08x\n", apsize);
        return (apsize << 22);
#else
        return sc->as_apsize;
#endif
}

static int
agp_apple_set_aperture(struct agp_softc *sc, u_int32_t aperture)
{
        pcireg_t reg;

        aprint_error("%s: %08x\n", __func__, aperture);
        reg = pci_conf_read(sc->as_pc, sc->as_tag, APPLE_UNINORTH_GART_BASE)
            & 0xfffff000;
        reg |= ((aperture >> 22) & 0xfff);
        pci_conf_write(sc->as_pc, sc->as_tag, APPLE_UNINORTH_GART_BASE, reg);
        sc->as_apsize = aperture;
        return 0;
}

static int
agp_apple_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
{
        struct agp_apple_softc *asc = sc->as_chipc;

        if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
                return EINVAL;

        asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = htole32(physical);
        return 0;
}

static int
agp_apple_unbind_page(struct agp_softc *sc, off_t offset)
{
        struct agp_apple_softc *asc = sc->as_chipc;

        if (offset < 0 || offset >= (asc->gatt->ag_entries << AGP_PAGE_SHIFT))
                return EINVAL;

        asc->gatt->ag_virtual[offset >> AGP_PAGE_SHIFT] = 0;
        return 0;
}

static void
agp_apple_flush_tlb(struct agp_softc *sc)
{

        pci_conf_write(sc->as_pc, sc->as_tag, APPLE_UNINORTH_GART_CTRL,
            APPLE_UNINORTH_GART_ENABLE);
        pci_conf_write(sc->as_pc, sc->as_tag, APPLE_UNINORTH_GART_CTRL,
            APPLE_UNINORTH_GART_ENABLE | APPLE_UNINORTH_GART_INVAL);
        pci_conf_write(sc->as_pc, sc->as_tag, APPLE_UNINORTH_GART_CTRL,
            APPLE_UNINORTH_GART_ENABLE);
}