/*      $NetBSD: agp_apple.c,v 1.8 2019/11/10 21:16:36 chs 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 1.8 2019/11/10 21:16:36 chs Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/agpio.h>

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

#include <sys/bus.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);
}

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