initial commit with v2.6.9
[linux-2.6.9-moxart.git] / arch / sh / drivers / pci / pci.c
blob4bf35336d824901eaeadc0b23edeac4d2873462e
1 /* arch/sh/kernel/pci.c
2 * $Id: pci.c,v 1.1 2003/08/24 19:15:45 lethal Exp $
4 * Copyright (c) 2002 M. R. Brown <mrbrown@linux-sh.org>
5 *
6 *
7 * These functions are collected here to reduce duplication of common
8 * code amongst the many platform-specific PCI support code files.
9 *
10 * These routines require the following board-specific routines:
11 * void pcibios_fixup_irqs();
13 * See include/asm-sh/pci.h for more information.
16 #include <linux/kernel.h>
17 #include <linux/pci.h>
18 #include <linux/init.h>
20 static int __init pcibios_init(void)
22 struct pci_channel *p;
23 struct pci_bus *bus;
24 int busno;
26 #ifdef CONFIG_PCI_AUTO
27 /* assign resources */
28 busno = 0;
29 for (p = board_pci_channels; p->pci_ops != NULL; p++) {
30 busno = pciauto_assign_resources(busno, p) + 1;
32 #endif
34 /* scan the buses */
35 busno = 0;
36 for (p= board_pci_channels; p->pci_ops != NULL; p++) {
37 bus = pci_scan_bus(busno, p->pci_ops, p);
38 busno = bus->subordinate+1;
41 /* board-specific fixups */
42 pcibios_fixup_irqs();
44 return 0;
47 subsys_initcall(pcibios_init);
49 void
50 pcibios_update_resource(struct pci_dev *dev, struct resource *root,
51 struct resource *res, int resource)
53 u32 new, check;
54 int reg;
56 new = res->start | (res->flags & PCI_REGION_FLAG_MASK);
57 if (resource < 6) {
58 reg = PCI_BASE_ADDRESS_0 + 4*resource;
59 } else if (resource == PCI_ROM_RESOURCE) {
60 res->flags |= PCI_ROM_ADDRESS_ENABLE;
61 new |= PCI_ROM_ADDRESS_ENABLE;
62 reg = dev->rom_base_reg;
63 } else {
64 /* Somebody might have asked allocation of a non-standard resource */
65 return;
68 pci_write_config_dword(dev, reg, new);
69 pci_read_config_dword(dev, reg, &check);
70 if ((new ^ check) & ((new & PCI_BASE_ADDRESS_SPACE_IO) ? PCI_BASE_ADDRESS_IO_MASK : PCI_BASE_ADDRESS_MEM_MASK)) {
71 printk(KERN_ERR "PCI: Error while updating region "
72 "%s/%d (%08x != %08x)\n", pci_name(dev), resource,
73 new, check);
77 void pcibios_align_resource(void *data, struct resource *res,
78 unsigned long size, unsigned long align)
79 __attribute__ ((weak));
82 * We need to avoid collisions with `mirrored' VGA ports
83 * and other strange ISA hardware, so we always want the
84 * addresses to be allocated in the 0x000-0x0ff region
85 * modulo 0x400.
87 void pcibios_align_resource(void *data, struct resource *res,
88 unsigned long size, unsigned long align)
90 if (res->flags & IORESOURCE_IO) {
91 unsigned long start = res->start;
93 if (start & 0x300) {
94 start = (start + 0x3ff) & ~0x3ff;
95 res->start = start;
100 int pcibios_enable_device(struct pci_dev *dev, int mask)
102 u16 cmd, old_cmd;
103 int idx;
104 struct resource *r;
106 pci_read_config_word(dev, PCI_COMMAND, &cmd);
107 old_cmd = cmd;
108 for(idx=0; idx<6; idx++) {
109 r = &dev->resource[idx];
110 if (!r->start && r->end) {
111 printk(KERN_ERR "PCI: Device %s not available because "
112 "of resource collisions\n", pci_name(dev));
113 return -EINVAL;
115 if (r->flags & IORESOURCE_IO)
116 cmd |= PCI_COMMAND_IO;
117 if (r->flags & IORESOURCE_MEM)
118 cmd |= PCI_COMMAND_MEMORY;
120 if (dev->resource[PCI_ROM_RESOURCE].start)
121 cmd |= PCI_COMMAND_MEMORY;
122 if (cmd != old_cmd) {
123 printk(KERN_INFO "PCI: Enabling device %s (%04x -> %04x)\n",
124 pci_name(dev), old_cmd, cmd);
125 pci_write_config_word(dev, PCI_COMMAND, cmd);
127 return 0;
131 * If we set up a device for bus mastering, we need to check and set
132 * the latency timer as it may not be properly set.
134 unsigned int pcibios_max_latency = 255;
136 void pcibios_set_master(struct pci_dev *dev)
138 u8 lat;
139 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
140 if (lat < 16)
141 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
142 else if (lat > pcibios_max_latency)
143 lat = pcibios_max_latency;
144 else
145 return;
146 printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
147 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
150 void __init pcibios_update_irq(struct pci_dev *dev, int irq)
152 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);