/*      $NetBSD: agp_ali.c,v 1.18 2026/06/21 17:09:44 andvar Exp $      */

/*-
 * Copyright (c) 2000 Doug Rabson
 * 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 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 AUTHOR 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.
 *
 *      $FreeBSD: src/sys/pci/agp_ali.c,v 1.3 2001/07/05 21:28:46 jhb Exp $
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: agp_ali.c,v 1.18 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/kernel.h>
#include <sys/malloc.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>

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

static u_int32_t agp_ali_get_aperture(struct agp_softc *);
static int agp_ali_set_aperture(struct agp_softc *sc, u_int32_t);
static int agp_ali_bind_page(struct agp_softc *, off_t, bus_addr_t);
static int agp_ali_unbind_page(struct agp_softc *, off_t);
static void agp_ali_flush_tlb(struct agp_softc *);


static struct agp_methods agp_ali_methods = {
        agp_ali_get_aperture,
        agp_ali_set_aperture,
        agp_ali_bind_page,
        agp_ali_unbind_page,
        agp_ali_flush_tlb,
        agp_generic_enable,
        agp_generic_alloc_memory,
        agp_generic_free_memory,
        agp_generic_bind_memory,
        agp_generic_unbind_memory,
};

int
agp_ali_attach(device_t parent, device_t self, void *aux)
{
        struct agp_softc *sc = device_private(self);
        struct agp_ali_softc *asc;
        struct pci_attach_args *pa = aux;
        struct agp_gatt *gatt;
        pcireg_t reg;

        asc = malloc(sizeof *asc, M_AGP, M_WAITOK);
        sc->as_chipc = asc;
        sc->as_methods = &agp_ali_methods;

        if (agp_map_aperture(pa, sc, AGP_APBASE) != 0) {
                aprint_error(": failed to map aperture\n");
                free(asc, M_AGP);
                return ENXIO;
        }

        pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_AGP, &sc->as_capoff,
            NULL);

        asc->initial_aperture = agp_ali_get_aperture(sc);

        for (;;) {
                gatt = agp_alloc_gatt(sc);
                if (gatt != NULL)
                        break;

                /*
                 * Probably contigmalloc failure. Try reducing the
                 * aperture so that the gatt size reduces.
                 */
                if (AGP_SET_APERTURE(sc, AGP_GET_APERTURE(sc) / 2)) {
                        agp_generic_detach(sc);
                        aprint_error(": failed to set aperture\n");
                        return ENOMEM;
                }
        }
        asc->gatt = gatt;

        /* Install the gatt. */
        reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_ALI_ATTBASE);
        reg = (reg & 0xfff) | (gatt->ag_physical & ~0xfff);
        pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_ALI_ATTBASE, reg);

        /* Enable the TLB. */
        reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AGP_ALI_TLBCTRL);
        reg = (reg & ~0xff) | 0x10;
        pci_conf_write(pa->pa_pc, pa->pa_tag, AGP_ALI_TLBCTRL, reg);

        return 0;
}

#if 0
static int
agp_ali_detach(struct agp_softc *sc)
{
        int error;
        pcireg_t reg;
        struct agp_ali_softc *asc = sc->as_chipc;

        error = agp_generic_detach(sc);
        if (error)
                return error;

        /* Disable the TLB.. */
        reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL);
        reg &= ~0xff;
        reg |= 0x90;
        pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);

        /* Put the aperture back the way it started. */
        AGP_SET_APERTURE(sc, asc->initial_aperture);
        reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE);
        reg &= 0xf;
        pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE, reg);

        agp_free_gatt(sc, asc->gatt);
        return 0;
}
#endif

#define M 1024*1024

static const u_int32_t agp_ali_table[] = {
        0,                      /* 0 - invalid */
        1,                      /* 1 - invalid */
        2,                      /* 2 - invalid */
        4*M,                    /* 3 */
        8*M,                    /* 4 */
        0,                      /* 5 - Reserved */
        16*M,                   /* 6 */
        32*M,                   /* 7 */
        64*M,                   /* 8 */
        128*M,                  /* 9 */
        256*M,                  /* 10 */
};
#define agp_ali_table_size (sizeof(agp_ali_table) / sizeof(agp_ali_table[0]))

static u_int32_t
agp_ali_get_aperture(struct agp_softc *sc)
{
        int i;

        /*
         * The aperture size is derived from the low bits of attbase.
         * I'm not sure this is correct..
         */
        i = (int)pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE) & 0xf;
        if (i >= agp_ali_table_size)
                return 0;
        return agp_ali_table[i];
}

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

        if (aperture & (aperture - 1) || aperture < 1*M)
                return EINVAL;

        for (i = 0; i < agp_ali_table_size; i++)
                if (agp_ali_table[i] == aperture)
                        break;
        if (i == agp_ali_table_size)
                return EINVAL;

        reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE);
        reg &= ~0xf;
        reg |= i;
        pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_ATTBASE, reg);
        return 0;
}

static int
agp_ali_bind_page(struct agp_softc *sc, off_t offset, bus_addr_t physical)
{
        struct agp_ali_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] = physical;
        return 0;
}

static int
agp_ali_unbind_page(struct agp_softc *sc, off_t offset)
{
        struct agp_ali_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_ali_flush_tlb(struct agp_softc *sc)
{
        pcireg_t reg;

        reg = pci_conf_read(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL);
        reg &= ~0xff;
        reg |= 0x90;
        pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
        reg &= ~0xff;
        reg |= 0x10;
        pci_conf_write(sc->as_pc, sc->as_tag, AGP_ALI_TLBCTRL, reg);
}