diff options
Diffstat (limited to 'arch/ppc/syslib/indirect_pci.c')
-rw-r--r-- | arch/ppc/syslib/indirect_pci.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/arch/ppc/syslib/indirect_pci.c b/arch/ppc/syslib/indirect_pci.c new file mode 100644 index 000000000000..83b323a7d029 --- /dev/null +++ b/arch/ppc/syslib/indirect_pci.c | |||
@@ -0,0 +1,134 @@ | |||
1 | /* | ||
2 | * Support for indirect PCI bridges. | ||
3 | * | ||
4 | * Copyright (C) 1998 Gabriel Paubert. | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or | ||
7 | * modify it under the terms of the GNU General Public License | ||
8 | * as published by the Free Software Foundation; either version | ||
9 | * 2 of the License, or (at your option) any later version. | ||
10 | */ | ||
11 | |||
12 | #include <linux/kernel.h> | ||
13 | #include <linux/pci.h> | ||
14 | #include <linux/delay.h> | ||
15 | #include <linux/string.h> | ||
16 | #include <linux/init.h> | ||
17 | |||
18 | #include <asm/io.h> | ||
19 | #include <asm/prom.h> | ||
20 | #include <asm/pci-bridge.h> | ||
21 | #include <asm/machdep.h> | ||
22 | |||
23 | #ifdef CONFIG_PPC_INDIRECT_PCI_BE | ||
24 | #define PCI_CFG_OUT out_be32 | ||
25 | #else | ||
26 | #define PCI_CFG_OUT out_le32 | ||
27 | #endif | ||
28 | |||
29 | static int | ||
30 | indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset, | ||
31 | int len, u32 *val) | ||
32 | { | ||
33 | struct pci_controller *hose = bus->sysdata; | ||
34 | volatile void __iomem *cfg_data; | ||
35 | u8 cfg_type = 0; | ||
36 | |||
37 | if (ppc_md.pci_exclude_device) | ||
38 | if (ppc_md.pci_exclude_device(bus->number, devfn)) | ||
39 | return PCIBIOS_DEVICE_NOT_FOUND; | ||
40 | |||
41 | if (hose->set_cfg_type) | ||
42 | if (bus->number != hose->first_busno) | ||
43 | cfg_type = 1; | ||
44 | |||
45 | PCI_CFG_OUT(hose->cfg_addr, | ||
46 | (0x80000000 | ((bus->number - hose->bus_offset) << 16) | ||
47 | | (devfn << 8) | ((offset & 0xfc) | cfg_type))); | ||
48 | |||
49 | /* | ||
50 | * Note: the caller has already checked that offset is | ||
51 | * suitably aligned and that len is 1, 2 or 4. | ||
52 | */ | ||
53 | cfg_data = hose->cfg_data + (offset & 3); | ||
54 | switch (len) { | ||
55 | case 1: | ||
56 | *val = in_8(cfg_data); | ||
57 | break; | ||
58 | case 2: | ||
59 | *val = in_le16(cfg_data); | ||
60 | break; | ||
61 | default: | ||
62 | *val = in_le32(cfg_data); | ||
63 | break; | ||
64 | } | ||
65 | return PCIBIOS_SUCCESSFUL; | ||
66 | } | ||
67 | |||
68 | static int | ||
69 | indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset, | ||
70 | int len, u32 val) | ||
71 | { | ||
72 | struct pci_controller *hose = bus->sysdata; | ||
73 | volatile void __iomem *cfg_data; | ||
74 | u8 cfg_type = 0; | ||
75 | |||
76 | if (ppc_md.pci_exclude_device) | ||
77 | if (ppc_md.pci_exclude_device(bus->number, devfn)) | ||
78 | return PCIBIOS_DEVICE_NOT_FOUND; | ||
79 | |||
80 | if (hose->set_cfg_type) | ||
81 | if (bus->number != hose->first_busno) | ||
82 | cfg_type = 1; | ||
83 | |||
84 | PCI_CFG_OUT(hose->cfg_addr, | ||
85 | (0x80000000 | ((bus->number - hose->bus_offset) << 16) | ||
86 | | (devfn << 8) | ((offset & 0xfc) | cfg_type))); | ||
87 | |||
88 | /* | ||
89 | * Note: the caller has already checked that offset is | ||
90 | * suitably aligned and that len is 1, 2 or 4. | ||
91 | */ | ||
92 | cfg_data = hose->cfg_data + (offset & 3); | ||
93 | switch (len) { | ||
94 | case 1: | ||
95 | out_8(cfg_data, val); | ||
96 | break; | ||
97 | case 2: | ||
98 | out_le16(cfg_data, val); | ||
99 | break; | ||
100 | default: | ||
101 | out_le32(cfg_data, val); | ||
102 | break; | ||
103 | } | ||
104 | return PCIBIOS_SUCCESSFUL; | ||
105 | } | ||
106 | |||
107 | static struct pci_ops indirect_pci_ops = | ||
108 | { | ||
109 | indirect_read_config, | ||
110 | indirect_write_config | ||
111 | }; | ||
112 | |||
113 | void __init | ||
114 | setup_indirect_pci_nomap(struct pci_controller* hose, void __iomem * cfg_addr, | ||
115 | void __iomem * cfg_data) | ||
116 | { | ||
117 | hose->cfg_addr = cfg_addr; | ||
118 | hose->cfg_data = cfg_data; | ||
119 | hose->ops = &indirect_pci_ops; | ||
120 | } | ||
121 | |||
122 | void __init | ||
123 | setup_indirect_pci(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data) | ||
124 | { | ||
125 | unsigned long base = cfg_addr & PAGE_MASK; | ||
126 | void __iomem *mbase, *addr, *data; | ||
127 | |||
128 | mbase = ioremap(base, PAGE_SIZE); | ||
129 | addr = mbase + (cfg_addr & ~PAGE_MASK); | ||
130 | if ((cfg_data & PAGE_MASK) != base) | ||
131 | mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE); | ||
132 | data = mbase + (cfg_data & ~PAGE_MASK); | ||
133 | setup_indirect_pci_nomap(hose, addr, data); | ||
134 | } | ||