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
53 static int iommu_match(device_t, cfdata_t, void *);
54 static void iommu_attach(device_t, device_t, void *);
55
56 CFATTACH_DECL_NEW(iommu, 0,
57 iommu_match, iommu_attach, NULL, NULL);
58
59 static iommu_pde_t *iommu_va;
60
61 static int
iommu_match(device_t parent,cfdata_t cf,void * args)62 iommu_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
71 static void
iommu_attach(device_t parent,device_t self,void * args)72 iommu_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
82 void
iommu_enter(uint32_t sa,uint32_t pa)83 iommu_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
102 void
iommu_remove(uint32_t sa,uint32_t len)103 iommu_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