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