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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 | |
355c471f |
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 | |
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30 | #include <asm/emma/emma2rh.h> |
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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 | |
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; |
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45 | db_assert(bus_num != NULL); |
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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 | |
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 | |
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 | |
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 | }; |