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