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>
24 indirect_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
27 struct pci_controller *hose = bus->sysdata;
28 volatile void __iomem *cfg_data;
32 if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK) {
33 if (bus->number != hose->first_busno)
34 return PCIBIOS_DEVICE_NOT_FOUND;
36 return PCIBIOS_DEVICE_NOT_FOUND;
39 if (ppc_md.pci_exclude_device)
40 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
41 return PCIBIOS_DEVICE_NOT_FOUND;
43 if (hose->indirect_type & PPC_INDIRECT_TYPE_SET_CFG_TYPE)
44 if (bus->number != hose->first_busno)
47 bus_no = (bus->number == hose->first_busno) ?
48 hose->self_busno : bus->number;
50 if (hose->indirect_type & PPC_INDIRECT_TYPE_EXT_REG)
51 reg = ((offset & 0xf00) << 16) | (offset & 0xfc);
55 if (hose->indirect_type & PPC_INDIRECT_TYPE_BIG_ENDIAN)
56 out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
57 (devfn << 8) | reg | cfg_type));
59 out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
60 (devfn << 8) | reg | cfg_type));
63 * Note: the caller has already checked that offset is
64 * suitably aligned and that len is 1, 2 or 4.
66 cfg_data = hose->cfg_data + (offset & 3);
69 *val = in_8(cfg_data);
72 *val = in_le16(cfg_data);
75 *val = in_le32(cfg_data);
78 return PCIBIOS_SUCCESSFUL;
82 indirect_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
85 struct pci_controller *hose = bus->sysdata;
86 volatile void __iomem *cfg_data;
90 if (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK) {
91 if (bus->number != hose->first_busno)
92 return PCIBIOS_DEVICE_NOT_FOUND;
94 return PCIBIOS_DEVICE_NOT_FOUND;
97 if (ppc_md.pci_exclude_device)
98 if (ppc_md.pci_exclude_device(hose, bus->number, devfn))
99 return PCIBIOS_DEVICE_NOT_FOUND;
101 if (hose->indirect_type & PPC_INDIRECT_TYPE_SET_CFG_TYPE)
102 if (bus->number != hose->first_busno)
105 bus_no = (bus->number == hose->first_busno) ?
106 hose->self_busno : bus->number;
108 if (hose->indirect_type & PPC_INDIRECT_TYPE_EXT_REG)
109 reg = ((offset & 0xf00) << 16) | (offset & 0xfc);
113 if (hose->indirect_type & PPC_INDIRECT_TYPE_BIG_ENDIAN)
114 out_be32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
115 (devfn << 8) | reg | cfg_type));
117 out_le32(hose->cfg_addr, (0x80000000 | (bus_no << 16) |
118 (devfn << 8) | reg | cfg_type));
120 /* surpress setting of PCI_PRIMARY_BUS */
121 if (hose->indirect_type & PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS)
122 if ((offset == PCI_PRIMARY_BUS) &&
123 (bus->number == hose->first_busno))
126 /* Workaround for PCI_28 Errata in 440EPx/GRx */
127 if ((hose->indirect_type & PPC_INDIRECT_TYPE_BROKEN_MRM) &&
128 offset == PCI_CACHE_LINE_SIZE) {
133 * Note: the caller has already checked that offset is
134 * suitably aligned and that len is 1, 2 or 4.
136 cfg_data = hose->cfg_data + (offset & 3);
139 out_8(cfg_data, val);
142 out_le16(cfg_data, val);
145 out_le32(cfg_data, val);
148 return PCIBIOS_SUCCESSFUL;
151 static struct pci_ops indirect_pci_ops =
153 .read = indirect_read_config,
154 .write = indirect_write_config,
158 setup_indirect_pci(struct pci_controller* hose,
159 resource_size_t cfg_addr,
160 resource_size_t cfg_data, u32 flags)
162 resource_size_t base = cfg_addr & PAGE_MASK;
165 mbase = ioremap(base, PAGE_SIZE);
166 hose->cfg_addr = mbase + (cfg_addr & ~PAGE_MASK);
167 if ((cfg_data & PAGE_MASK) != base)
168 mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE);
169 hose->cfg_data = mbase + (cfg_data & ~PAGE_MASK);
170 hose->ops = &indirect_pci_ops;
171 hose->indirect_type = flags;