ia64/linux-2.6.18-xen.hg

view arch/mips/pci/ops-gt64111.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
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1 /*
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
4 * for more details.
5 *
6 * Copyright (C) 1995, 1996, 1997, 2002 by Ralf Baechle
7 * Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv)
8 */
9 #include <linux/types.h>
10 #include <linux/pci.h>
11 #include <linux/kernel.h>
12 #include <linux/init.h>
14 #include <asm/pci.h>
15 #include <asm/io.h>
16 #include <asm/gt64120.h>
18 #include <asm/mach-cobalt/cobalt.h>
20 /*
21 * Device 31 on the GT64111 is used to generate PCI special
22 * cycles, so we shouldn't expected to find a device there ...
23 */
24 static inline int pci_range_ck(struct pci_bus *bus, unsigned int devfn)
25 {
26 if (bus->number == 0 && PCI_SLOT(devfn) < 31)
27 return 0;
29 return -1;
30 }
32 static int gt64111_pci_read_config(struct pci_bus *bus, unsigned int devfn,
33 int where, int size, u32 * val)
34 {
35 if (pci_range_ck(bus, devfn))
36 return PCIBIOS_DEVICE_NOT_FOUND;
38 switch (size) {
39 case 4:
40 PCI_CFG_SET(devfn, where);
41 *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS);
42 return PCIBIOS_SUCCESSFUL;
44 case 2:
45 PCI_CFG_SET(devfn, (where & ~0x3));
46 *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS)
47 >> ((where & 3) * 8);
48 return PCIBIOS_SUCCESSFUL;
50 case 1:
51 PCI_CFG_SET(devfn, (where & ~0x3));
52 *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS)
53 >> ((where & 3) * 8);
54 return PCIBIOS_SUCCESSFUL;
55 }
57 return PCIBIOS_BAD_REGISTER_NUMBER;
58 }
60 static int gt64111_pci_write_config(struct pci_bus *bus, unsigned int devfn,
61 int where, int size, u32 val)
62 {
63 u32 tmp;
65 if (pci_range_ck(bus, devfn))
66 return PCIBIOS_DEVICE_NOT_FOUND;
68 switch (size) {
69 case 4:
70 PCI_CFG_SET(devfn, where);
71 GALILEO_OUTL(val, GT_PCI0_CFGDATA_OFS);
73 return PCIBIOS_SUCCESSFUL;
75 case 2:
76 PCI_CFG_SET(devfn, (where & ~0x3));
77 tmp = GALILEO_INL(GT_PCI0_CFGDATA_OFS);
78 tmp &= ~(0xffff << ((where & 0x3) * 8));
79 tmp |= (val << ((where & 0x3) * 8));
80 GALILEO_OUTL(tmp, GT_PCI0_CFGDATA_OFS);
82 return PCIBIOS_SUCCESSFUL;
84 case 1:
85 PCI_CFG_SET(devfn, (where & ~0x3));
86 tmp = GALILEO_INL(GT_PCI0_CFGDATA_OFS);
87 tmp &= ~(0xff << ((where & 0x3) * 8));
88 tmp |= (val << ((where & 0x3) * 8));
89 GALILEO_OUTL(tmp, GT_PCI0_CFGDATA_OFS);
91 return PCIBIOS_SUCCESSFUL;
92 }
94 return PCIBIOS_BAD_REGISTER_NUMBER;
95 }
97 struct pci_ops gt64111_pci_ops = {
98 .read = gt64111_pci_read_config,
99 .write = gt64111_pci_write_config,
100 };