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 #include <linux/bootmem.h>
18
19 #include <asm/io.h>
20 #include <asm/prom.h>
21 #include <asm/pci-bridge.h>
22 #include <asm/machdep.h>
23
24 #define cfg_read(val, addr, type, op) *val = op((type)(addr))
25 #define cfg_write(val, addr, type, op) op((type *)(addr), (val))
26
27 #ifdef CONFIG_PPC_INDIRECT_PCI_BE
28 #define PCI_CFG_OUT out_be32
29 #else
30 #define PCI_CFG_OUT out_le32
31 #endif
32
33 #define INDIRECT_PCI_OP(rw, size, type, op, mask) \
34 static int \
35 indirect_##rw##_config_##size(struct pci_dev *dev, int offset, type val) \
36 { \
37 struct pci_controller *hose = dev->sysdata; \
38 u8 cfg_type = 0; \
39 \
40 if (ppc_md.pci_exclude_device) \
41 if (ppc_md.pci_exclude_device(dev->bus->number, dev->devfn)) \
42 return PCIBIOS_DEVICE_NOT_FOUND; \
43 \
44 if (hose->set_cfg_type) \
45 if (dev->bus->number != hose->first_busno) \
46 cfg_type = 1; \
47 \
48 PCI_CFG_OUT(hose->cfg_addr, \
49 (0x80000000 | ((dev->bus->number - hose->bus_offset) << 16) \
50 | (dev->devfn << 8) | ((offset & 0xfc) | cfg_type))); \
51 cfg_##rw(val, hose->cfg_data + (offset & mask), type, op); \
52 return PCIBIOS_SUCCESSFUL; \
53 }
54
55 INDIRECT_PCI_OP(read, byte, u8 *, in_8, 3)
56 INDIRECT_PCI_OP(read, word, u16 *, in_le16, 2)
57 INDIRECT_PCI_OP(read, dword, u32 *, in_le32, 0)
58 INDIRECT_PCI_OP(write, byte, u8, out_8, 3)
59 INDIRECT_PCI_OP(write, word, u16, out_le16, 2)
60 INDIRECT_PCI_OP(write, dword, u32, out_le32, 0)
61
62 static struct pci_ops indirect_pci_ops =
63 {
64 indirect_read_config_byte,
65 indirect_read_config_word,
66 indirect_read_config_dword,
67 indirect_write_config_byte,
68 indirect_write_config_word,
69 indirect_write_config_dword
70 };
71
72 void __init
setup_indirect_pci(struct pci_controller * hose,u32 cfg_addr,u32 cfg_data)73 setup_indirect_pci(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
74 {
75 hose->ops = &indirect_pci_ops;
76 hose->cfg_addr = (unsigned int *) ioremap(cfg_addr, 4);
77 hose->cfg_data = (unsigned char *) ioremap(cfg_data, 4);
78 }
79
80