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/*
* arch/sh/drivers/pci/pci.c
*
* Copyright (c) 2002 M. R. Brown <mrbrown@linux-sh.org>
* Copyright (c) 2004 - 2006 Paul Mundt <lethal@linux-sh.org>
*
* These functions are collected here to reduce duplication of common
* code amongst the many platform-specific PCI support code files.
*
* These routines require the following board-specific routines:
* void pcibios_fixup_irqs();
*
* See include/asm-sh/pci.h for more information.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <asm/io.h>
static inline u8 bridge_swizzle(u8 pin, u8 slot)
{
return (((pin - 1) + slot) % 4) + 1;
}
static u8 __init simple_swizzle(struct pci_dev *dev, u8 *pinp)
{
u8 pin = *pinp;
while (dev->bus->parent) {
pin = bridge_swizzle(pin, PCI_SLOT(dev->devfn));
/* Move up the chain of bridges. */
dev = dev->bus->self;
}
*pinp = pin;
/* The slot is the slot of the last bridge. */
return PCI_SLOT(dev->devfn);
}
static int __init pcibios_init(void)
{
struct pci_channel *p;
struct pci_bus *bus;
int busno;
#ifdef CONFIG_PCI_AUTO
/* assign resources */
busno = 0;
for (p = board_pci_channels; p->pci_ops != NULL; p++)
busno = pciauto_assign_resources(busno, p) + 1;
#endif
/* scan the buses */
busno = 0;
for (p = board_pci_channels; p->pci_ops != NULL; p++) {
bus = pci_scan_bus(busno, p->pci_ops, p);
busno = bus->subordinate + 1;
}
pci_fixup_irqs(simple_swizzle, pcibios_map_platform_irq);
return 0;
}
subsys_initcall(pcibios_init);
/*
* Called after each bus is probed, but before its children
* are examined.
*/
void __devinit __weak pcibios_fixup_bus(struct pci_bus *bus)
{
pci_read_bridge_bases(bus);
}
void pcibios_align_resource(void *data, struct resource *res,
resource_size_t size, resource_size_t align)
__attribute__ ((weak));
/*
* We need to avoid collisions with `mirrored' VGA ports
* and other strange ISA hardware, so we always want the
* addresses to be allocated in the 0x000-0x0ff region
* modulo 0x400.
*/
void pcibios_align_resource(void *data, struct resource *res,
resource_size_t size, resource_size_t align)
{
if (res->flags & IORESOURCE_IO) {
resource_size_t start = res->start;
if (start & 0x300) {
start = (start + 0x3ff) & ~0x3ff;
res->start = start;
}
}
}
int pcibios_enable_device(struct pci_dev *dev, int mask)
{
u16 cmd, old_cmd;
int idx;
struct resource *r;
pci_read_config_word(dev, PCI_COMMAND, &cmd);
old_cmd = cmd;
for(idx=0; idx<6; idx++) {
if (!(mask & (1 << idx)))
continue;
r = &dev->resource[idx];
if (!r->start && r->end) {
printk(KERN_ERR "PCI: Device %s not available because "
"of resource collisions\n", pci_name(dev));
return -EINVAL;
}
if (r->flags & IORESOURCE_IO)
cmd |= PCI_COMMAND_IO;
if (r->flags & IORESOURCE_MEM)
cmd |= PCI_COMMAND_MEMORY;
}
if (dev->resource[PCI_ROM_RESOURCE].start)
cmd |= PCI_COMMAND_MEMORY;
if (cmd != old_cmd) {
printk(KERN_INFO "PCI: Enabling device %s (%04x -> %04x)\n",
pci_name(dev), old_cmd, cmd);
pci_write_config_word(dev, PCI_COMMAND, cmd);
}
return 0;
}
/*
* If we set up a device for bus mastering, we need to check and set
* the latency timer as it may not be properly set.
*/
static unsigned int pcibios_max_latency = 255;
void pcibios_set_master(struct pci_dev *dev)
{
u8 lat;
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
if (lat < 16)
lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
else if (lat > pcibios_max_latency)
lat = pcibios_max_latency;
else
return;
printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n",
pci_name(dev), lat);
pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}
void __init pcibios_update_irq(struct pci_dev *dev, int irq)
{
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
}
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
{
resource_size_t start = pci_resource_start(dev, bar);
resource_size_t len = pci_resource_len(dev, bar);
unsigned long flags = pci_resource_flags(dev, bar);
if (unlikely(!len || !start))
return NULL;
if (maxlen && len > maxlen)
len = maxlen;
/*
* Presently the IORESOURCE_MEM case is a bit special, most
* SH7751 style PCI controllers have PCI memory at a fixed
* location in the address space where no remapping is desired
* (typically at 0xfd000000, but is_pci_memaddr() will know
* best). With the IORESOURCE_MEM case more care has to be taken
* to inhibit page table mapping for legacy cores, but this is
* punted off to __ioremap().
* -- PFM.
*/
if (flags & IORESOURCE_IO)
return ioport_map(start, len);
if (flags & IORESOURCE_MEM)
return ioremap(start, len);
return NULL;
}
EXPORT_SYMBOL(pci_iomap);
void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
{
iounmap(addr);
}
EXPORT_SYMBOL(pci_iounmap);
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