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
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
|
/*
* Carsten Langgaard, carstenl@mips.com
* Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved.
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope 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.,
* 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
*/
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <asm/gt64120.h>
#define PCI_ACCESS_READ 0
#define PCI_ACCESS_WRITE 1
/*
* PCI configuration cycle AD bus definition
*/
/* Type 0 */
#define PCI_CFG_TYPE0_REG_SHF 0
#define PCI_CFG_TYPE0_FUNC_SHF 8
/* Type 1 */
#define PCI_CFG_TYPE1_REG_SHF 0
#define PCI_CFG_TYPE1_FUNC_SHF 8
#define PCI_CFG_TYPE1_DEV_SHF 11
#define PCI_CFG_TYPE1_BUS_SHF 16
static int gt64120_pcibios_config_access(unsigned char access_type,
struct pci_bus *bus, unsigned int devfn, int where, u32 * data)
{
unsigned char busnum = bus->number;
u32 intr;
if ((busnum == 0) && (PCI_SLOT(devfn) == 0))
/* Galileo itself is devfn 0, don't move it around */
return -1;
if ((busnum == 0) && (devfn >= PCI_DEVFN(31, 0)))
return -1; /* Because of a bug in the galileo (for slot 31). */
/* Clear cause register bits */
GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT |
GT_INTRCAUSE_TARABORT0_BIT));
/* Setup address */
GT_WRITE(GT_PCI0_CFGADDR_OFS,
(busnum << GT_PCI0_CFGADDR_BUSNUM_SHF) |
(devfn << GT_PCI0_CFGADDR_FUNCTNUM_SHF) |
((where / 4) << GT_PCI0_CFGADDR_REGNUM_SHF) |
GT_PCI0_CFGADDR_CONFIGEN_BIT);
if (access_type == PCI_ACCESS_WRITE) {
if (busnum == 0 && PCI_SLOT(devfn) == 0) {
/*
* The Galileo system controller is acting
* differently than other devices.
*/
GT_WRITE(GT_PCI0_CFGDATA_OFS, *data);
} else
__GT_WRITE(GT_PCI0_CFGDATA_OFS, *data);
} else {
if (busnum == 0 && PCI_SLOT(devfn) == 0) {
/*
* The Galileo system controller is acting
* differently than other devices.
*/
*data = GT_READ(GT_PCI0_CFGDATA_OFS);
} else
*data = __GT_READ(GT_PCI0_CFGDATA_OFS);
}
/* Check for master or target abort */
intr = GT_READ(GT_INTRCAUSE_OFS);
if (intr & (GT_INTRCAUSE_MASABORT0_BIT | GT_INTRCAUSE_TARABORT0_BIT)) {
/* Error occurred */
/* Clear bits */
GT_WRITE(GT_INTRCAUSE_OFS, ~(GT_INTRCAUSE_MASABORT0_BIT |
GT_INTRCAUSE_TARABORT0_BIT));
return -1;
}
return 0;
}
/*
* We can't address 8 and 16 bit words directly. Instead we have to
* read/write a 32bit word and mask/modify the data we actually want.
*/
static int gt64120_pcibios_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 * val)
{
u32 data = 0;
if (gt64120_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
&data))
return PCIBIOS_DEVICE_NOT_FOUND;
if (size == 1)
*val = (data >> ((where & 3) << 3)) & 0xff;
else if (size == 2)
*val = (data >> ((where & 3) << 3)) & 0xffff;
else
*val = data;
return PCIBIOS_SUCCESSFUL;
}
static int gt64120_pcibios_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
u32 data = 0;
if (size == 4)
data = val;
else {
if (gt64120_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
where, &data))
return PCIBIOS_DEVICE_NOT_FOUND;
if (size == 1)
data = (data & ~(0xff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
else if (size == 2)
data = (data & ~(0xffff << ((where & 3) << 3))) |
(val << ((where & 3) << 3));
}
if (gt64120_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
&data))
return PCIBIOS_DEVICE_NOT_FOUND;
return PCIBIOS_SUCCESSFUL;
}
struct pci_ops gt64120_pci_ops = {
.read = gt64120_pcibios_read,
.write = gt64120_pcibios_write
};
|
