mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 02:04:19 +08:00
e6b29deafa
Export the following symbols so they can be referenced by a PCI host bridge driver compiled as a kernel loadable module: pci_common_swizzle pci_create_root_bus pci_stop_root_bus pci_remove_root_bus pci_assign_unassigned_bus_resources pci_fixup_irqs Signed-off-by: Ray Jui <rjui@broadcom.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/*
|
|
* drivers/pci/setup-irq.c
|
|
*
|
|
* Extruded from code written by
|
|
* Dave Rusling (david.rusling@reo.mts.dec.com)
|
|
* David Mosberger (davidm@cs.arizona.edu)
|
|
* David Miller (davem@redhat.com)
|
|
*
|
|
* Support routines for initializing a PCI subsystem.
|
|
*/
|
|
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/cache.h>
|
|
|
|
void __weak pcibios_update_irq(struct pci_dev *dev, int irq)
|
|
{
|
|
dev_dbg(&dev->dev, "assigning IRQ %02d\n", irq);
|
|
pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
|
|
}
|
|
|
|
static void pdev_fixup_irq(struct pci_dev *dev,
|
|
u8 (*swizzle)(struct pci_dev *, u8 *),
|
|
int (*map_irq)(const struct pci_dev *, u8, u8))
|
|
{
|
|
u8 pin, slot;
|
|
int irq = 0;
|
|
|
|
/* If this device is not on the primary bus, we need to figure out
|
|
which interrupt pin it will come in on. We know which slot it
|
|
will come in on 'cos that slot is where the bridge is. Each
|
|
time the interrupt line passes through a PCI-PCI bridge we must
|
|
apply the swizzle function. */
|
|
|
|
pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
|
|
/* Cope with illegal. */
|
|
if (pin > 4)
|
|
pin = 1;
|
|
|
|
if (pin != 0) {
|
|
/* Follow the chain of bridges, swizzling as we go. */
|
|
slot = (*swizzle)(dev, &pin);
|
|
|
|
irq = (*map_irq)(dev, slot, pin);
|
|
if (irq == -1)
|
|
irq = 0;
|
|
}
|
|
dev->irq = irq;
|
|
|
|
dev_dbg(&dev->dev, "fixup irq: got %d\n", dev->irq);
|
|
|
|
/* Always tell the device, so the driver knows what is
|
|
the real IRQ to use; the device does not use it. */
|
|
pcibios_update_irq(dev, irq);
|
|
}
|
|
|
|
void pci_fixup_irqs(u8 (*swizzle)(struct pci_dev *, u8 *),
|
|
int (*map_irq)(const struct pci_dev *, u8, u8))
|
|
{
|
|
struct pci_dev *dev = NULL;
|
|
|
|
for_each_pci_dev(dev)
|
|
pdev_fixup_irq(dev, swizzle, map_irq);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_fixup_irqs);
|