2 * Support for indirect PCI bridges.
4 * Copyright (C) 1998 Gabriel Paubert.
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.
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>
20 #include <asm/pci-bridge.h>
21 #include <asm/machdep.h>
23 int indirect_read_config(struct pci_bus *bus, unsigned int devfn,
24 int offset, int len, u32 *val)
26 struct pci_controller *hose = pci_bus_to_host(bus);
27 volatile void __iomem *cfg_data;
31 if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK) {
32 if (bus->number != hose->first_busno)
33 return PCIBIOS_DEVICE_NOT_FOUND;
35 return PCIBIOS_DEVICE_NOT_FOUND;
38 if (ppc_md.pci_exclude_device)
39 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
40 return PCIBIOS_DEVICE_NOT_FOUND;
42 if (hose->indirect_type & PPC_INDIRECT_TYPE_SET_CFG_TYPE)
43 if (bus->number != hose->first_busno)
46 bus_no = (bus->number == hose->first_busno) ?
47 hose->self_busno : bus->number;
49 if (hose->indirect_type & PPC_INDIRECT_TYPE_EXT_REG)
50 reg = ((offset & 0xf00) << 16) | (offset & 0xfc);
54 if (hose->indirect_type & PPC_INDIRECT_TYPE_BIG_ENDIAN)
55 out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
56 (devfn << 8) | reg | cfg_type));
58 out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
59 (devfn << 8) | reg | cfg_type));
62 * Note: the caller has already checked that offset is
63 * suitably aligned and that len is 1, 2 or 4.
65 cfg_data = hose->cfg_data + (offset & 3);
68 *val = in_8(cfg_data);
71 *val = in_le16(cfg_data);
74 *val = in_le32(cfg_data);
77 return PCIBIOS_SUCCESSFUL;
80 int indirect_write_config(struct pci_bus *bus, unsigned int devfn,
81 int offset, int len, u32 val)
83 struct pci_controller *hose = pci_bus_to_host(bus);
84 volatile void __iomem *cfg_data;
88 if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK) {
89 if (bus->number != hose->first_busno)
90 return PCIBIOS_DEVICE_NOT_FOUND;
92 return PCIBIOS_DEVICE_NOT_FOUND;
95 if (ppc_md.pci_exclude_device)
96 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
97 return PCIBIOS_DEVICE_NOT_FOUND;
99 if (hose->indirect_type & PPC_INDIRECT_TYPE_SET_CFG_TYPE)
100 if (bus->number != hose->first_busno)
103 bus_no = (bus->number == hose->first_busno) ?
104 hose->self_busno : bus->number;
106 if (hose->indirect_type & PPC_INDIRECT_TYPE_EXT_REG)
107 reg = ((offset & 0xf00) << 16) | (offset & 0xfc);
111 if (hose->indirect_type & PPC_INDIRECT_TYPE_BIG_ENDIAN)
112 out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
113 (devfn << 8) | reg | cfg_type));
115 out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
116 (devfn << 8) | reg | cfg_type));
118 /* suppress setting of PCI_PRIMARY_BUS */
119 if (hose->indirect_type & PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS)
120 if ((offset == PCI_PRIMARY_BUS) &&
121 (bus->number == hose->first_busno))
124 /* Workaround for PCI_28 Errata in 440EPx/GRx */
125 if ((hose->indirect_type & PPC_INDIRECT_TYPE_BROKEN_MRM) &&
126 offset == PCI_CACHE_LINE_SIZE) {
131 * Note: the caller has already checked that offset is
132 * suitably aligned and that len is 1, 2 or 4.
134 cfg_data = hose->cfg_data + (offset & 3);
137 out_8(cfg_data, val);
140 out_le16(cfg_data, val);
143 out_le32(cfg_data, val);
146 return PCIBIOS_SUCCESSFUL;
149 static struct pci_ops indirect_pci_ops =
151 .read = indirect_read_config,
152 .write = indirect_write_config,
155 void setup_indirect_pci(struct pci_controller *hose, resource_size_t cfg_addr,
156 resource_size_t cfg_data, u32 flags)
158 resource_size_t base = cfg_addr & PAGE_MASK;
161 mbase = ioremap(base, PAGE_SIZE);
162 hose->cfg_addr = mbase + (cfg_addr & ~PAGE_MASK);
163 if ((cfg_data & PAGE_MASK) != base)
164 mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE);
165 hose->cfg_data = mbase + (cfg_data & ~PAGE_MASK);
166 hose->ops = &indirect_pci_ops;
167 hose->indirect_type = flags;