mirror of
https://github.com/torvalds/linux.git
synced 2024-12-22 19:01:37 +00:00
d5341942d7
Aside of the usual motivation for constification, this function has a history of being abused a hook for interrupt and other fixups so I turned this function const ages ago in the MIPS code but it should be done treewide. Due to function pointer passing in varous places a few other functions had to be constified as well. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> To: Anton Vorontsov <avorontsov@mvista.com> To: Chris Metcalf <cmetcalf@tilera.com> To: Colin Cross <ccross@android.com> Acked-by: "David S. Miller" <davem@davemloft.net> To: Eric Miao <eric.y.miao@gmail.com> To: Erik Gilling <konkers@android.com> Acked-by: Guan Xuetao <gxt@mprc.pku.edu.cn> To: "H. Peter Anvin" <hpa@zytor.com> To: Imre Kaloz <kaloz@openwrt.org> To: Ingo Molnar <mingo@redhat.com> To: Ivan Kokshaysky <ink@jurassic.park.msu.ru> To: Jesse Barnes <jbarnes@virtuousgeek.org> To: Krzysztof Halasa <khc@pm.waw.pl> To: Lennert Buytenhek <kernel@wantstofly.org> To: Matt Turner <mattst88@gmail.com> To: Nicolas Pitre <nico@fluxnic.net> To: Olof Johansson <olof@lixom.net> Acked-by: Paul Mundt <lethal@linux-sh.org> To: Richard Henderson <rth@twiddle.net> To: Russell King <linux@arm.linux.org.uk> To: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-alpha@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Cc: linux-pci@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: linux-tegra@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: x86@kernel.org Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
65 lines
1.6 KiB
C
65 lines
1.6 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/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/ioport.h>
|
|
#include <linux/cache.h>
|
|
|
|
|
|
static void __init
|
|
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 __init
|
|
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);
|
|
}
|