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>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
/*
|
|
* linux/arch/arm/mach-integrator/pci-integrator.c
|
|
*
|
|
* Copyright (C) 1999 ARM Limited
|
|
* Copyright (C) 2000 Deep Blue Solutions Ltd
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
*
|
|
* PCI functions for Integrator
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/init.h>
|
|
|
|
#include <asm/irq.h>
|
|
#include <asm/system.h>
|
|
#include <asm/mach/pci.h>
|
|
#include <asm/mach-types.h>
|
|
|
|
/*
|
|
* A small note about bridges and interrupts. The DECchip 21050 (and
|
|
* later) adheres to the PCI-PCI bridge specification. This says that
|
|
* the interrupts on the other side of a bridge are swizzled in the
|
|
* following manner:
|
|
*
|
|
* Dev Interrupt Interrupt
|
|
* Pin on Pin on
|
|
* Device Connector
|
|
*
|
|
* 4 A A
|
|
* B B
|
|
* C C
|
|
* D D
|
|
*
|
|
* 5 A B
|
|
* B C
|
|
* C D
|
|
* D A
|
|
*
|
|
* 6 A C
|
|
* B D
|
|
* C A
|
|
* D B
|
|
*
|
|
* 7 A D
|
|
* B A
|
|
* C B
|
|
* D C
|
|
*
|
|
* Where A = pin 1, B = pin 2 and so on and pin=0 = default = A.
|
|
* Thus, each swizzle is ((pin-1) + (device#-4)) % 4
|
|
*/
|
|
|
|
/*
|
|
* This routine handles multiple bridges.
|
|
*/
|
|
static u8 __init integrator_swizzle(struct pci_dev *dev, u8 *pinp)
|
|
{
|
|
int pin = *pinp;
|
|
|
|
if (pin == 0)
|
|
pin = 1;
|
|
|
|
while (dev->bus->self) {
|
|
pin = pci_swizzle_interrupt_pin(dev, pin);
|
|
/*
|
|
* move up the chain of bridges, swizzling as we go.
|
|
*/
|
|
dev = dev->bus->self;
|
|
}
|
|
*pinp = pin;
|
|
|
|
return PCI_SLOT(dev->devfn);
|
|
}
|
|
|
|
static int irq_tab[4] __initdata = {
|
|
IRQ_AP_PCIINT0, IRQ_AP_PCIINT1, IRQ_AP_PCIINT2, IRQ_AP_PCIINT3
|
|
};
|
|
|
|
/*
|
|
* map the specified device/slot/pin to an IRQ. This works out such
|
|
* that slot 9 pin 1 is INT0, pin 2 is INT1, and slot 10 pin 1 is INT1.
|
|
*/
|
|
static int __init integrator_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
|
|
{
|
|
int intnr = ((slot - 9) + (pin - 1)) & 3;
|
|
|
|
return irq_tab[intnr];
|
|
}
|
|
|
|
extern void pci_v3_init(void *);
|
|
|
|
static struct hw_pci integrator_pci __initdata = {
|
|
.swizzle = integrator_swizzle,
|
|
.map_irq = integrator_map_irq,
|
|
.setup = pci_v3_setup,
|
|
.nr_controllers = 1,
|
|
.scan = pci_v3_scan_bus,
|
|
.preinit = pci_v3_preinit,
|
|
.postinit = pci_v3_postinit,
|
|
};
|
|
|
|
static int __init integrator_pci_init(void)
|
|
{
|
|
if (machine_is_integrator())
|
|
pci_common_init(&integrator_pci);
|
|
return 0;
|
|
}
|
|
|
|
subsys_initcall(integrator_pci_init);
|