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.
11 * "Temporary" MPC8548 Errata file -
12 * The standard indirect_pci code should work with future silicon versions.
15 #include <linux/kernel.h>
16 #include <linux/pci.h>
17 #include <linux/delay.h>
18 #include <linux/string.h>
19 #include <linux/init.h>
20 #include <linux/bootmem.h>
24 #include <asm/pci-bridge.h>
25 #include <asm/machdep.h>
29 #define PCI_CFG_OUT out_be32
31 /* ERRATA PCI-Ex 14 PCIE Controller timeout */
32 #define PCIE_FIX out_be32(hose->cfg_addr+0x4, 0x0400ffff)
36 indirect_read_config_pcie(struct pci_bus *bus, unsigned int devfn, int offset,
39 struct pci_controller *hose = bus->sysdata;
40 volatile void __iomem *cfg_data;
43 if (ppc_md.pci_exclude_device)
44 if (ppc_md.pci_exclude_device(bus->number, devfn))
45 return PCIBIOS_DEVICE_NOT_FOUND;
47 /* Possible artifact of CDCpp50937 needs further investigation */
48 if (devfn != 0x0 && bus->number == 0xff)
49 return PCIBIOS_DEVICE_NOT_FOUND;
52 if (bus->number == 0xff) {
53 PCI_CFG_OUT(hose->cfg_addr,
54 (0x80000000 | ((offset & 0xf00) << 16) |
55 ((bus->number - hose->bus_offset) << 16)
56 | (devfn << 8) | ((offset & 0xfc) )));
58 PCI_CFG_OUT(hose->cfg_addr,
59 (0x80000001 | ((offset & 0xf00) << 16) |
60 ((bus->number - hose->bus_offset) << 16)
61 | (devfn << 8) | ((offset & 0xfc) )));
65 * Note: the caller has already checked that offset is
66 * suitably aligned and that len is 1, 2 or 4.
68 /* ERRATA PCI-Ex 12 - Configuration Address/Data Alignment */
69 cfg_data = hose->cfg_data;
71 temp = in_le32(cfg_data);
74 *val = (temp >> (((offset & 3))*8)) & 0xff;
77 *val = (temp >> (((offset & 3))*8)) & 0xffff;
83 return PCIBIOS_SUCCESSFUL;
87 indirect_write_config_pcie(struct pci_bus *bus, unsigned int devfn, int offset,
90 struct pci_controller *hose = bus->sysdata;
91 volatile void __iomem *cfg_data;
94 if (ppc_md.pci_exclude_device)
95 if (ppc_md.pci_exclude_device(bus->number, devfn))
96 return PCIBIOS_DEVICE_NOT_FOUND;
98 /* Possible artifact of CDCpp50937 needs further investigation */
99 if (devfn != 0x0 && bus->number == 0xff)
100 return PCIBIOS_DEVICE_NOT_FOUND;
103 if (bus->number == 0xff) {
104 PCI_CFG_OUT(hose->cfg_addr,
105 (0x80000000 | ((offset & 0xf00) << 16) |
106 ((bus->number - hose->bus_offset) << 16)
107 | (devfn << 8) | ((offset & 0xfc) )));
109 PCI_CFG_OUT(hose->cfg_addr,
110 (0x80000001 | ((offset & 0xf00) << 16) |
111 ((bus->number - hose->bus_offset) << 16)
112 | (devfn << 8) | ((offset & 0xfc) )));
116 * Note: the caller has already checked that offset is
117 * suitably aligned and that len is 1, 2 or 4.
119 /* ERRATA PCI-Ex 12 - Configuration Address/Data Alignment */
120 cfg_data = hose->cfg_data;
124 temp = in_le32(cfg_data);
125 temp = (temp & ~(0xff << ((offset & 3) * 8))) |
126 (val << ((offset & 3) * 8));
128 out_le32(cfg_data, temp);
132 temp = in_le32(cfg_data);
133 temp = (temp & ~(0xffff << ((offset & 3) * 8)));
134 temp |= (val << ((offset & 3) * 8)) ;
136 out_le32(cfg_data, temp);
140 out_le32(cfg_data, val);
144 return PCIBIOS_SUCCESSFUL;
147 static struct pci_ops indirect_pcie_ops = {
148 indirect_read_config_pcie,
149 indirect_write_config_pcie
153 setup_indirect_pcie_nomap(struct pci_controller* hose, void __iomem * cfg_addr,
154 void __iomem * cfg_data)
156 hose->cfg_addr = cfg_addr;
157 hose->cfg_data = cfg_data;
158 hose->ops = &indirect_pcie_ops;
162 setup_indirect_pcie(struct pci_controller* hose, u32 cfg_addr, u32 cfg_data)
164 unsigned long base = cfg_addr & PAGE_MASK;
165 void __iomem *mbase, *addr, *data;
167 mbase = ioremap(base, PAGE_SIZE);
168 addr = mbase + (cfg_addr & ~PAGE_MASK);
169 if ((cfg_data & PAGE_MASK) != base)
170 mbase = ioremap(cfg_data & PAGE_MASK, PAGE_SIZE);
171 data = mbase + (cfg_data & ~PAGE_MASK);
172 setup_indirect_pcie_nomap(hose, addr, data);