1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2012 secunet Security Networks AG
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <stdint.h>
#include <string.h>
#include <arch/io.h>
#include <device/pci_def.h>
#include <arch/acpi.h>
#include "gm45.h"
void init_iommu()
{
/* FIXME: proper test? */
int me_active = pci_read_config8(PCI_DEV(0, 3, 0), PCI_CLASS_REVISION) != 0xff;
int stepping = pci_read_config8(PCI_DEV(0, 0, 0), PCI_CLASS_REVISION);
MCHBAR32(0x28) = IOMMU_BASE1 | 1; /* HDA @ 0:1b.0 */
if (stepping != STEPPING_B2) {
/* The official workaround is to run SMM every 64ms.
The only winning move is not to play. */
MCHBAR32(0x18) = IOMMU_BASE2 | 1; /* IGD @ 0:2.0-1 */
} else {
/* write-once, so lock it down */
MCHBAR32(0x18) = 0; /* disable IOMMU for IGD @ 0:2.0-1 */
}
if (me_active) {
MCHBAR32(0x10) = IOMMU_BASE3 | 1; /* ME @ 0:3.0-3 */
}
MCHBAR32(0x20) = IOMMU_BASE4 | 1; /* all other DMA sources */
/* clear GTT */
u32 gtt = pci_read_config16(PCI_DEV(0, 0, 0), 0x52);
if (gtt & 0x400) { /* VT mode */
device_t igd = PCI_DEV(0, 2, 0);
/* setup somewhere */
u8 cmd = pci_read_config8(igd, PCI_COMMAND);
cmd |= PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
pci_write_config8(igd, PCI_COMMAND, cmd);
void* bar = (void*)pci_read_config32(igd, PCI_BASE_ADDRESS_0);
/* clear GTT, 2MB is enough (and should be safe) */
memset(bar, 0, 2<<20);
/* and now disable again */
cmd &= ~(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
pci_write_config8(igd, PCI_COMMAND, cmd);
pci_write_config32(igd, PCI_BASE_ADDRESS_0, 0);
}
if (stepping == STEPPING_B3) {
MCHBAR8(0xffc) |= 1 << 4;
device_t peg = PCI_DEV(0, 1, 0);
/* FIXME: proper test? */
if (pci_read_config8(peg, PCI_CLASS_REVISION) != 0xff) {
int val = pci_read_config32(peg, 0xfc) | (1 << 15);
pci_write_config32(peg, 0xfc, val);
}
}
/* final */
MCHBAR8(0x94) |= 1 << 3;
}
|
