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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | /* * 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); |