2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1995, 1996, 1997, 2002 by Ralf Baechle
7 * Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv)
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
16 #include <asm/gt64120.h>
18 #include <asm/mach-cobalt/cobalt.h>
21 * Device 31 on the GT64111 is used to generate PCI special
22 * cycles, so we shouldn't expected to find a device there ...
24 static inline int pci_range_ck(struct pci_bus *bus, unsigned int devfn)
26 if (bus->number == 0 && PCI_SLOT(devfn) < 31)
32 static int gt64111_pci_read_config(struct pci_bus *bus, unsigned int devfn,
33 int where, int size, u32 * val)
35 if (pci_range_ck(bus, devfn))
36 return PCIBIOS_DEVICE_NOT_FOUND;
40 PCI_CFG_SET(devfn, where);
41 *val = GT_READ(GT_PCI0_CFGDATA_OFS);
42 return PCIBIOS_SUCCESSFUL;
45 PCI_CFG_SET(devfn, (where & ~0x3));
46 *val = GT_READ(GT_PCI0_CFGDATA_OFS)
48 return PCIBIOS_SUCCESSFUL;
51 PCI_CFG_SET(devfn, (where & ~0x3));
52 *val = GT_READ(GT_PCI0_CFGDATA_OFS)
54 return PCIBIOS_SUCCESSFUL;
57 return PCIBIOS_BAD_REGISTER_NUMBER;
60 static int gt64111_pci_write_config(struct pci_bus *bus, unsigned int devfn,
61 int where, int size, u32 val)
65 if (pci_range_ck(bus, devfn))
66 return PCIBIOS_DEVICE_NOT_FOUND;
70 PCI_CFG_SET(devfn, where);
71 GT_WRITE(GT_PCI0_CFGDATA_OFS, val);
73 return PCIBIOS_SUCCESSFUL;
76 PCI_CFG_SET(devfn, (where & ~0x3));
77 tmp = GT_READ(GT_PCI0_CFGDATA_OFS);
78 tmp &= ~(0xffff << ((where & 0x3) * 8));
79 tmp |= (val << ((where & 0x3) * 8));
80 GT_WRITE(GT_PCI0_CFGDATA_OFS, tmp);
82 return PCIBIOS_SUCCESSFUL;
85 PCI_CFG_SET(devfn, (where & ~0x3));
86 tmp = GT_READ(GT_PCI0_CFGDATA_OFS);
87 tmp &= ~(0xff << ((where & 0x3) * 8));
88 tmp |= (val << ((where & 0x3) * 8));
89 GT_WRITE(GT_PCI0_CFGDATA_OFS, tmp);
91 return PCIBIOS_SUCCESSFUL;
94 return PCIBIOS_BAD_REGISTER_NUMBER;
97 struct pci_ops gt64111_pci_ops = {
98 .read = gt64111_pci_read_config,
99 .write = gt64111_pci_write_config,