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 }
135