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-rw-r--r--arch/mips/pci/ops-emma2rh.c186
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-emma2rh.c b/arch/mips/pci/ops-emma2rh.c
new file mode 100644
index 000000000000..e21b11bf66bc
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1/*
2 * arch/mips/pci/ops-emma2rh.c
3 * This file defines the PCI operation for EMMA2RH.
4 *
5 * Copyright (C) NEC Electronics Corporation 2004-2006
6 *
7 * This file is based on the arch/mips/pci/ops-vr41xx.c
8 *
9 * Copyright 2001 MontaVista Software Inc.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26#include <linux/config.h>
27#include <linux/pci.h>
28#include <linux/kernel.h>
29#include <linux/types.h>
30
31#include <asm/addrspace.h>
32#include <asm/debug.h>
33
34#include <asm/emma2rh/emma2rh.h>
35
36#define RTABORT (0x1<<9)
37#define RMABORT (0x1<<10)
38#define EMMA2RH_PCI_SLOT_NUM 9 /* 0000:09.0 is final PCI device */
39
40/*
41 * access config space
42 */
43
44static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num)
45{
46 /* check if the bus is top-level */
47 if (bus->parent != NULL) {
48 *bus_num = bus->number;
49 db_assert(bus_num != 0);
50 } else
51 *bus_num = 0;
52
53 if (*bus_num == 0) {
54 /* Type 0 */
55 if (PCI_SLOT(devfn) >= 10)
56 return PCIBIOS_DEVICE_NOT_FOUND;
57 } else {
58 /* Type 1 */
59 if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16))
60 return PCIBIOS_DEVICE_NOT_FOUND;
61 }
62 return 0;
63}
64
65static inline int set_pci_configuration_address(unsigned char bus_num,
66 unsigned int devfn, int where)
67{
68 u32 config_win0;
69
70 emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT);
71 if (bus_num == 0)
72 /*
73 * Type 0 configuration
74 */
75 config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9);
76 else
77 /*
78 * Type 1 configuration
79 */
80 config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) |
81 (1 << 15) | (5 << 9);
82
83 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0);
84
85 return 0;
86}
87
88static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
89 int size, uint32_t * val)
90{
91 u32 bus_num;
92 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
93 u32 backup_win0;
94 u32 data;
95
96 *val = 0xffffffffU;
97
98 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
99 return PCIBIOS_DEVICE_NOT_FOUND;
100
101 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
102
103 if (set_pci_configuration_address(bus_num, devfn, where) < 0)
104 return PCIBIOS_DEVICE_NOT_FOUND;
105
106 data =
107 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
108 (where & 0xfffffffc));
109
110 switch (size) {
111 case 1:
112 *val = (data >> ((where & 3) << 3)) & 0xffU;
113 break;
114 case 2:
115 *val = (data >> ((where & 2) << 3)) & 0xffffU;
116 break;
117 case 4:
118 *val = data;
119 break;
120 default:
121 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
122 return PCIBIOS_FUNC_NOT_SUPPORTED;
123 }
124
125 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
126
127 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
128 return PCIBIOS_DEVICE_NOT_FOUND;
129
130 return PCIBIOS_SUCCESSFUL;
131}
132
133static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
134 int size, u32 val)
135{
136 u32 bus_num;
137 u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
138 u32 backup_win0;
139 u32 data;
140 int shift;
141
142 if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
143 return PCIBIOS_DEVICE_NOT_FOUND;
144
145 backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
146
147 if (set_pci_configuration_address(bus_num, devfn, where) < 0)
148 return PCIBIOS_DEVICE_NOT_FOUND;
149
150 /* read modify write */
151 data =
152 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
153 (where & 0xfffffffc));
154
155 switch (size) {
156 case 1:
157 shift = (where & 3) << 3;
158 data &= ~(0xffU << shift);
159 data |= ((val & 0xffU) << shift);
160 break;
161 case 2:
162 shift = (where & 2) << 3;
163 data &= ~(0xffffU << shift);
164 data |= ((val & 0xffffU) << shift);
165 break;
166 case 4:
167 data = val;
168 break;
169 default:
170 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
171 return PCIBIOS_FUNC_NOT_SUPPORTED;
172 }
173 *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
174 (where & 0xfffffffc)) = data;
175
176 emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
177 if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
178 return PCIBIOS_DEVICE_NOT_FOUND;
179
180 return PCIBIOS_SUCCESSFUL;
181}
182
183struct pci_ops emma2rh_pci_ops = {
184 .read = pci_config_read,
185 .write = pci_config_write,
186};
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 06:29:12 -0500