1/*	$NetBSD: iommu.c,v 1.19 2023/12/20 05:18:00 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jeremy Cooper.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Set-up functions for the Sun3x DVMA I/O Mapper.
34 */
35
36#include <sys/cdefs.h>
37__KERNEL_RCSID(0, "$NetBSD: iommu.c,v 1.19 2023/12/20 05:18:00 thorpej Exp $");
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/device.h>
42#include <sys/conf.h>
43#include <sys/buf.h>
44#include <sys/proc.h>
45
46#include <machine/autoconf.h>
47
48#include <sun3/sun3x/iommu.h>
49#include <sun3/sun3x/obio.h>
50
51#define IOMMU_SIZE	(IOMMU_NENT * sizeof(iommu_pde_t))
52
53static int  iommu_match(device_t, cfdata_t, void *);
54static void iommu_attach(device_t, device_t, void *);
55
56CFATTACH_DECL_NEW(iommu, 0,
57    iommu_match, iommu_attach, NULL, NULL);
58
59static iommu_pde_t *iommu_va;
60
61static int
62iommu_match(device_t parent, cfdata_t cf, void *args)
63{
64	/* This driver only supports one instance. */
65	if (iommu_va)
66		return 0;
67
68	return 1;
69}
70
71static void
72iommu_attach(device_t parent, device_t self, void *args)
73{
74	struct confargs *ca = args;
75
76	iommu_va = (iommu_pde_t *)bus_mapin(ca->ca_bustype, ca->ca_paddr,
77	    IOMMU_SIZE);
78
79	aprint_normal("\n");
80}
81
82void
83iommu_enter(uint32_t sa, uint32_t pa)
84{
85	int pn;
86
87#ifdef	DIAGNOSTIC
88	if (sa > (1<<24))
89		panic("%s: bad sa", __func__);
90#endif
91
92	/* Convert the slave address into a page index. */
93	pn = IOMMU_BTOP(sa);
94
95	/* Mask the physical address to insure it is page aligned */
96	pa &= IOMMU_PDE_PA;
97	pa |= IOMMU_PDE_DT_VALID;
98
99	iommu_va[pn].addr.raw = pa;
100}
101
102void
103iommu_remove(uint32_t sa, uint32_t len)
104{
105	int pn;
106
107#ifdef	DIAGNOSTIC
108	if (sa > (1<<24))
109		panic("%s: bad sa", __func__);
110#endif
111
112	pn = IOMMU_BTOP(sa);
113	while (len > 0) {
114		iommu_va[pn++].addr.raw = IOMMU_PDE_DT_INVALID;
115		len -= IOMMU_PAGE_SIZE;
116	}
117}
118