66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2012 Alexandru Gagniuc <mr.nuke.me@gmail.com>
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* Copyright (C) 2012 Patrick Georgi <patrick@georgi-clan.de>
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* Copyright (C) 2010 Stefan Reinauer <stepan@coreboot.org>
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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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#ifndef ARCH_PIRQ_ROUTING_H
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#define ARCH_PIRQ_ROUTING_H
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/* This is the maximum number on interrupt entries that a PCI device may have.
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* This is NOT the number of slots or devices in the system
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* This is NOT the number of entries in the PIRQ table
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* This tells us that in the PIRQ table, we are going to have 4 link-bitmap
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* entries per PCI device
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* It is fixed at 4: INTA, INTB, INTC, and INTD
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* CAUTION: If you change this, pirq_routing will not work correctly */
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#define MAX_INTX_ENTRIES 4
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#include <stdint.h>
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#include <compiler.h>
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#define PIRQ_SIGNATURE (('$' << 0) + ('P' << 8) + ('I' << 16) + ('R' << 24))
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#define PIRQ_VERSION 0x0100
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struct irq_info {
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u8 bus, devfn; /* Bus, device and function */
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struct {
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u8 link; /* IRQ line ID, chipset dependent, 0=not routed */
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u16 bitmap; /* Available IRQs */
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} __packed irq[4];
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u8 slot; /* Slot number, 0=onboard */
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u8 rfu;
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} __packed;
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struct irq_routing_table {
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u32 signature; /* PIRQ_SIGNATURE should be here */
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u16 version; /* PIRQ_VERSION */
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u16 size; /* Table size in bytes */
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u8 rtr_bus, rtr_devfn; /* Where the interrupt router lies */
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u16 exclusive_irqs; /* IRQs devoted exclusively to PCI usage */
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u16 rtr_vendor, rtr_device;/* Vendor/device ID of interrupt router */
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u32 miniport_data;
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u8 rfu[11];
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u8 checksum; /* Modulo 256 checksum must give zero */
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struct irq_info slots[CONFIG_IRQ_SLOT_COUNT];
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} __packed;
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unsigned long copy_pirq_routing_table(unsigned long addr,
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const struct irq_routing_table *routing_table);
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unsigned long write_pirq_routing_table(unsigned long start);
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void pirq_assign_irqs(const unsigned char pirq[CONFIG_MAX_PIRQ_LINKS]);
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#endif /* ARCH_PIRQ_ROUTING_H */
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