2 * arch/sh/drivers/pci/pci.c
4 * Copyright (c) 2002 M. R. Brown <mrbrown@linux-sh.org>
5 * Copyright (c) 2004 - 2006 Paul Mundt <lethal@linux-sh.org>
7 * These functions are collected here to reduce duplication of common
8 * code amongst the many platform-specific PCI support code files.
10 * These routines require the following board-specific routines:
11 * void pcibios_fixup_irqs();
13 * See include/asm-sh/pci.h for more information.
15 * This file is subject to the terms and conditions of the GNU General Public
16 * License. See the file "COPYING" in the main directory of this archive
19 #include <linux/kernel.h>
20 #include <linux/pci.h>
21 #include <linux/init.h>
22 #include <linux/dma-debug.h>
25 static int __init pcibios_init(void)
27 struct pci_channel *p;
33 for (p = board_pci_channels; p->init; p++) {
37 pr_err("Unable to init pci channel %d\n", busno);
41 #ifdef CONFIG_PCI_AUTO
42 /* assign resources */
44 for (p = board_pci_channels; p->init; p++)
46 busno = pciauto_assign_resources(busno, p) + 1;
51 for (p = board_pci_channels; p->init; p++) {
53 bus = pci_scan_bus(busno, p->pci_ops, p);
54 busno = bus->subordinate + 1;
58 pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);
60 dma_debug_add_bus(&pci_bus_type);
64 subsys_initcall(pcibios_init);
67 * Called after each bus is probed, but before its children
70 void __devinit __weak pcibios_fixup_bus(struct pci_bus *bus)
72 pci_read_bridge_bases(bus);
75 void pcibios_align_resource(void *data, struct resource *res,
76 resource_size_t size, resource_size_t align)
77 __attribute__ ((weak));
80 * We need to avoid collisions with `mirrored' VGA ports
81 * and other strange ISA hardware, so we always want the
82 * addresses to be allocated in the 0x000-0x0ff region
85 void pcibios_align_resource(void *data, struct resource *res,
86 resource_size_t size, resource_size_t align)
88 if (res->flags & IORESOURCE_IO) {
89 resource_size_t start = res->start;
92 start = (start + 0x3ff) & ~0x3ff;
98 int pcibios_enable_device(struct pci_dev *dev, int mask)
104 pci_read_config_word(dev, PCI_COMMAND, &cmd);
106 for(idx=0; idx<6; idx++) {
107 if (!(mask & (1 << 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));
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);
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 static unsigned int pcibios_max_latency = 255;
136 void pcibios_set_master(struct pci_dev *dev)
139 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
141 lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
142 else if (lat > pcibios_max_latency)
143 lat = pcibios_max_latency;
146 printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n",
148 pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
151 void __init pcibios_update_irq(struct pci_dev *dev, int irq)
153 pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
156 void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
158 resource_size_t start = pci_resource_start(dev, bar);
159 resource_size_t len = pci_resource_len(dev, bar);
160 unsigned long flags = pci_resource_flags(dev, bar);
162 if (unlikely(!len || !start))
164 if (maxlen && len > maxlen)
168 * Presently the IORESOURCE_MEM case is a bit special, most
169 * SH7751 style PCI controllers have PCI memory at a fixed
170 * location in the address space where no remapping is desired.
171 * With the IORESOURCE_MEM case more care has to be taken
172 * to inhibit page table mapping for legacy cores, but this is
173 * punted off to __ioremap().
176 if (flags & IORESOURCE_IO)
177 return ioport_map(start, len);
178 if (flags & IORESOURCE_MEM)
179 return ioremap(start, len);
183 EXPORT_SYMBOL(pci_iomap);
185 void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
189 EXPORT_SYMBOL(pci_iounmap);
191 EXPORT_SYMBOL(board_pci_channels);