NetBSD/sys/arch/sun3/sun3x/iommu.c

138 lines
3.8 KiB
C

/* $NetBSD: iommu.c,v 1.5 1997/04/25 18:45:39 gwr Exp $ */
/*-
* Copyright (c) 1996 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jeremy Cooper.
*
* 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 by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* 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.
*/
/*
* Set-up functions for the Sun3x DVMA I/O Mapper.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <machine/autoconf.h>
#include <machine/obio.h>
#include "iommu.h"
#define IOMMU_SIZE (IOMMU_NENT * sizeof(iommu_pde_t))
static int iommu_match __P((struct device *, struct cfdata *, void *));
static void iommu_attach __P((struct device *, struct device *, void *));
struct cfattach iommu_ca = {
sizeof(struct device), iommu_match, iommu_attach
};
struct cfdriver iommu_cd = {
NULL, "iommu", DV_DULL
};
static iommu_pde_t *iommu_va;
static int
iommu_match(parent, cf, args)
struct device *parent;
struct cfdata *cf;
void *args;
{
/* This driver only supports one unit. */
if (cf->cf_unit != 0)
return (0);
return (1);
}
static void
iommu_attach(parent, self, args)
struct device *parent;
struct device *self;
void *args;
{
struct confargs *ca = args;
iommu_va = (iommu_pde_t *)
bus_mapin(ca->ca_bustype, ca->ca_paddr, IOMMU_SIZE);
printf(": range %dMB\n", IOMMU_NENT * IOMMU_PAGE_SIZE / (1024 * 1024));
}
void
iommu_enter(sa, pa)
u_int32_t sa; /* slave address */
u_int32_t pa; /* phys. address */
{
int pn;
#ifdef DIAGNOSTIC
if (sa > (1<<24))
panic("iommu_enter: bad sa");
#endif
/* Convert the slave address into a page index. */
pn = IOMMU_BTOP(sa);
/* Mask the physical address to insure it is page aligned */
pa &= IOMMU_PDE_PA;
pa |= IOMMU_PDE_DT_VALID;
iommu_va[pn].addr.raw = pa;
}
void
iommu_remove(sa, len)
u_int32_t sa; /* slave address */
u_int32_t len;
{
int pn;
#ifdef DIAGNOSTIC
if (sa > (1<<24))
panic("iommu_enter: bad sa");
#endif
pn = IOMMU_BTOP(sa);
while (len > 0) {
iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
len -= IOMMU_PAGE_SIZE;
}
}