/*      $NetBSD: agp_ali.c,v 1.17 2019/11/10 21:16:36 chs 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 1.17 2019/11/10 21:16:36 chs Exp $");

#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/systm.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>

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);
}

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