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1 | /* |
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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 | |
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23 | #include <linux/pci.h> |
24 | #include <linux/kernel.h> |
25 | #include <linux/types.h> |
26 | |
27 | #include <asm/addrspace.h> |
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28 | |
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29 | #include <asm/emma/emma2rh.h> |
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30 | |
31 | #define RTABORT (0x1<<9) |
32 | #define RMABORT (0x1<<10) |
33 | #define EMMA2RH_PCI_SLOT_NUM 9 /* 0000:09.0 is final PCI device */ |
34 | |
35 | /* |
36 | * access config space |
37 | */ |
38 | |
39 | static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num) |
40 | { |
41 | /* check if the bus is top-level */ |
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42 | if (bus->parent != NULL) |
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43 | *bus_num = bus->number; |
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44 | else |
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45 | *bus_num = 0; |
46 | |
47 | if (*bus_num == 0) { |
48 | /* Type 0 */ |
49 | if (PCI_SLOT(devfn) >= 10) |
50 | return PCIBIOS_DEVICE_NOT_FOUND; |
51 | } else { |
52 | /* Type 1 */ |
53 | if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16)) |
54 | return PCIBIOS_DEVICE_NOT_FOUND; |
55 | } |
56 | return 0; |
57 | } |
58 | |
59 | static inline int set_pci_configuration_address(unsigned char bus_num, |
60 | unsigned int devfn, int where) |
61 | { |
62 | u32 config_win0; |
63 | |
64 | emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT); |
65 | if (bus_num == 0) |
66 | /* |
67 | * Type 0 configuration |
68 | */ |
69 | config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9); |
70 | else |
71 | /* |
72 | * Type 1 configuration |
73 | */ |
74 | config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) | |
75 | (1 << 15) | (5 << 9); |
76 | |
77 | emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0); |
78 | |
79 | return 0; |
80 | } |
81 | |
82 | static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, |
83 | int size, uint32_t * val) |
84 | { |
85 | u32 bus_num; |
86 | u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE); |
87 | u32 backup_win0; |
88 | u32 data; |
89 | |
90 | *val = 0xffffffffU; |
91 | |
92 | if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND) |
93 | return PCIBIOS_DEVICE_NOT_FOUND; |
94 | |
95 | backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR); |
96 | |
97 | if (set_pci_configuration_address(bus_num, devfn, where) < 0) |
98 | return PCIBIOS_DEVICE_NOT_FOUND; |
99 | |
100 | data = |
101 | *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + |
102 | (where & 0xfffffffc)); |
103 | |
104 | switch (size) { |
105 | case 1: |
106 | *val = (data >> ((where & 3) << 3)) & 0xffU; |
107 | break; |
108 | case 2: |
109 | *val = (data >> ((where & 2) << 3)) & 0xffffU; |
110 | break; |
111 | case 4: |
112 | *val = data; |
113 | break; |
114 | default: |
115 | emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); |
116 | return PCIBIOS_FUNC_NOT_SUPPORTED; |
117 | } |
118 | |
119 | emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); |
120 | |
121 | if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT) |
122 | return PCIBIOS_DEVICE_NOT_FOUND; |
123 | |
124 | return PCIBIOS_SUCCESSFUL; |
125 | } |
126 | |
127 | static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, |
128 | int size, u32 val) |
129 | { |
130 | u32 bus_num; |
131 | u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE); |
132 | u32 backup_win0; |
133 | u32 data; |
134 | int shift; |
135 | |
136 | if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND) |
137 | return PCIBIOS_DEVICE_NOT_FOUND; |
138 | |
139 | backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR); |
140 | |
141 | if (set_pci_configuration_address(bus_num, devfn, where) < 0) |
142 | return PCIBIOS_DEVICE_NOT_FOUND; |
143 | |
144 | /* read modify write */ |
145 | data = |
146 | *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + |
147 | (where & 0xfffffffc)); |
148 | |
149 | switch (size) { |
150 | case 1: |
151 | shift = (where & 3) << 3; |
152 | data &= ~(0xffU << shift); |
153 | data |= ((val & 0xffU) << shift); |
154 | break; |
155 | case 2: |
156 | shift = (where & 2) << 3; |
157 | data &= ~(0xffffU << shift); |
158 | data |= ((val & 0xffffU) << shift); |
159 | break; |
160 | case 4: |
161 | data = val; |
162 | break; |
163 | default: |
164 | emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); |
165 | return PCIBIOS_FUNC_NOT_SUPPORTED; |
166 | } |
167 | *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + |
168 | (where & 0xfffffffc)) = data; |
169 | |
170 | emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); |
171 | if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT) |
172 | return PCIBIOS_DEVICE_NOT_FOUND; |
173 | |
174 | return PCIBIOS_SUCCESSFUL; |
175 | } |
176 | |
177 | struct pci_ops emma2rh_pci_ops = { |
178 | .read = pci_config_read, |
179 | .write = pci_config_write, |
180 | }; |