524 lines
13 KiB
C
524 lines
13 KiB
C
/*
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* pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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* Copyright (C) 2002 Dominik Brodowski <devel@brodo.de>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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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 (at
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* 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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/proc_fs.h>
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#include <linux/spinlock.h>
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#include <linux/pm.h>
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#include <linux/pci.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#define _COMPONENT ACPI_PCI_COMPONENT
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ACPI_MODULE_NAME("pci_irq")
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static struct acpi_prt_list acpi_prt;
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static DEFINE_SPINLOCK(acpi_prt_lock);
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/* --------------------------------------------------------------------------
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PCI IRQ Routing Table (PRT) Support
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-------------------------------------------------------------------------- */
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static struct acpi_prt_entry *acpi_pci_irq_find_prt_entry(int segment,
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int bus,
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int device, int pin)
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{
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struct list_head *node = NULL;
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struct acpi_prt_entry *entry = NULL;
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if (!acpi_prt.count)
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return NULL;
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/*
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* Parse through all PRT entries looking for a match on the specified
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* PCI device's segment, bus, device, and pin (don't care about func).
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*
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*/
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spin_lock(&acpi_prt_lock);
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list_for_each(node, &acpi_prt.entries) {
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entry = list_entry(node, struct acpi_prt_entry, node);
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if ((segment == entry->id.segment)
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&& (bus == entry->id.bus)
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&& (device == entry->id.device)
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&& (pin == entry->pin)) {
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spin_unlock(&acpi_prt_lock);
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return entry;
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}
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}
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spin_unlock(&acpi_prt_lock);
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return NULL;
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}
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static int
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acpi_pci_irq_add_entry(acpi_handle handle,
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int segment, int bus, struct acpi_pci_routing_table *prt)
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{
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struct acpi_prt_entry *entry = NULL;
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if (!prt)
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return -EINVAL;
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entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
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if (!entry)
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return -ENOMEM;
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entry->id.segment = segment;
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entry->id.bus = bus;
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entry->id.device = (prt->address >> 16) & 0xFFFF;
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entry->id.function = prt->address & 0xFFFF;
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entry->pin = prt->pin;
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/*
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* Type 1: Dynamic
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* ---------------
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* The 'source' field specifies the PCI interrupt link device used to
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* configure the IRQ assigned to this slot|dev|pin. The 'source_index'
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* indicates which resource descriptor in the resource template (of
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* the link device) this interrupt is allocated from.
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*
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* NOTE: Don't query the Link Device for IRQ information at this time
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* because Link Device enumeration may not have occurred yet
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* (e.g. exists somewhere 'below' this _PRT entry in the ACPI
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* namespace).
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*/
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if (prt->source[0]) {
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acpi_get_handle(handle, prt->source, &entry->link.handle);
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entry->link.index = prt->source_index;
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}
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/*
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* Type 2: Static
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* --------------
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* The 'source' field is NULL, and the 'source_index' field specifies
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* the IRQ value, which is hardwired to specific interrupt inputs on
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* the interrupt controller.
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*/
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else
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entry->link.index = prt->source_index;
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ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
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" %02X:%02X:%02X[%c] -> %s[%d]\n",
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entry->id.segment, entry->id.bus,
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entry->id.device, ('A' + entry->pin), prt->source,
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entry->link.index));
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spin_lock(&acpi_prt_lock);
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list_add_tail(&entry->node, &acpi_prt.entries);
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acpi_prt.count++;
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spin_unlock(&acpi_prt_lock);
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return 0;
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}
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static void
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acpi_pci_irq_del_entry(int segment, int bus, struct acpi_prt_entry *entry)
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{
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if (segment == entry->id.segment && bus == entry->id.bus) {
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acpi_prt.count--;
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list_del(&entry->node);
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kfree(entry);
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}
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}
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int acpi_pci_irq_add_prt(acpi_handle handle, int segment, int bus)
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{
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acpi_status status = AE_OK;
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char *pathname = NULL;
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struct acpi_buffer buffer = { 0, NULL };
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struct acpi_pci_routing_table *prt = NULL;
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struct acpi_pci_routing_table *entry = NULL;
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static int first_time = 1;
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pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
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if (!pathname)
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return -ENOMEM;
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if (first_time) {
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acpi_prt.count = 0;
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INIT_LIST_HEAD(&acpi_prt.entries);
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first_time = 0;
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}
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/*
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* NOTE: We're given a 'handle' to the _PRT object's parent device
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* (either a PCI root bridge or PCI-PCI bridge).
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*/
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buffer.length = ACPI_PATHNAME_MAX;
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buffer.pointer = pathname;
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acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
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printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
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pathname);
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/*
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* Evaluate this _PRT and add its entries to our global list (acpi_prt).
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*/
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buffer.length = 0;
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buffer.pointer = NULL;
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kfree(pathname);
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status = acpi_get_irq_routing_table(handle, &buffer);
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if (status != AE_BUFFER_OVERFLOW) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
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acpi_format_exception(status)));
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return -ENODEV;
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}
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prt = kzalloc(buffer.length, GFP_KERNEL);
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if (!prt) {
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return -ENOMEM;
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}
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buffer.pointer = prt;
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status = acpi_get_irq_routing_table(handle, &buffer);
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
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acpi_format_exception(status)));
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kfree(buffer.pointer);
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return -ENODEV;
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}
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entry = prt;
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while (entry && (entry->length > 0)) {
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acpi_pci_irq_add_entry(handle, segment, bus, entry);
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entry = (struct acpi_pci_routing_table *)
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((unsigned long)entry + entry->length);
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}
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kfree(prt);
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return 0;
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}
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void acpi_pci_irq_del_prt(int segment, int bus)
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{
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struct list_head *node = NULL, *n = NULL;
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struct acpi_prt_entry *entry = NULL;
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if (!acpi_prt.count) {
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return;
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}
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printk(KERN_DEBUG
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"ACPI: Delete PCI Interrupt Routing Table for %x:%x\n", segment,
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bus);
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spin_lock(&acpi_prt_lock);
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list_for_each_safe(node, n, &acpi_prt.entries) {
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entry = list_entry(node, struct acpi_prt_entry, node);
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acpi_pci_irq_del_entry(segment, bus, entry);
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}
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spin_unlock(&acpi_prt_lock);
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}
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/* --------------------------------------------------------------------------
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PCI Interrupt Routing Support
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-------------------------------------------------------------------------- */
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typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
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static int
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acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
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int *triggering, int *polarity, char **link)
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{
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int irq;
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if (entry->link.handle) {
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irq = acpi_pci_link_allocate_irq(entry->link.handle,
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entry->link.index, triggering,
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polarity, link);
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if (irq < 0) {
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printk(KERN_WARNING PREFIX
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"Invalid IRQ link routing entry\n");
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return -1;
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}
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} else {
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irq = entry->link.index;
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*triggering = ACPI_LEVEL_SENSITIVE;
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*polarity = ACPI_ACTIVE_LOW;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
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return irq;
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}
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static int
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acpi_pci_free_irq(struct acpi_prt_entry *entry,
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int *triggering, int *polarity, char **link)
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{
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int irq;
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if (entry->link.handle) {
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irq = acpi_pci_link_free_irq(entry->link.handle);
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} else {
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irq = entry->link.index;
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}
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return irq;
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}
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/*
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* acpi_pci_irq_lookup
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* success: return IRQ >= 0
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* failure: return -1
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*/
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static int
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acpi_pci_irq_lookup(struct pci_bus *bus,
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int device,
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int pin,
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int *triggering,
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int *polarity, char **link, irq_lookup_func func)
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{
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struct acpi_prt_entry *entry = NULL;
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int segment = pci_domain_nr(bus);
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int bus_nr = bus->number;
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int ret;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Searching for PRT entry for %02x:%02x:%02x[%c]\n",
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segment, bus_nr, device, ('A' + pin)));
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entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin);
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if (!entry) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n"));
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return -1;
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}
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ret = func(entry, triggering, polarity, link);
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return ret;
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}
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/*
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* acpi_pci_irq_derive
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* success: return IRQ >= 0
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* failure: return < 0
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*/
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static int
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acpi_pci_irq_derive(struct pci_dev *dev,
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int pin,
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int *triggering,
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int *polarity, char **link, irq_lookup_func func)
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{
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struct pci_dev *bridge = dev;
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int irq = -1;
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u8 bridge_pin = 0;
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if (!dev)
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return -EINVAL;
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/*
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* Attempt to derive an IRQ for this device from a parent bridge's
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* PCI interrupt routing entry (eg. yenta bridge and add-in card bridge).
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*/
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while (irq < 0 && bridge->bus->self) {
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pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
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bridge = bridge->bus->self;
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if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
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/* PC card has the same IRQ as its cardbridge */
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bridge_pin = bridge->pin;
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if (!bridge_pin) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No interrupt pin configured for device %s\n",
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pci_name(bridge)));
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return -1;
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}
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/* Pin is from 0 to 3 */
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bridge_pin--;
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pin = bridge_pin;
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}
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irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
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pin, triggering, polarity,
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link, func);
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}
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if (irq < 0) {
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printk(KERN_WARNING PREFIX "Unable to derive IRQ for device %s\n",
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pci_name(dev));
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return -1;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
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irq, pci_name(dev), pci_name(bridge)));
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return irq;
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}
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/*
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* acpi_pci_irq_enable
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* success: return 0
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* failure: return < 0
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*/
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int acpi_pci_irq_enable(struct pci_dev *dev)
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{
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int irq = 0;
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u8 pin = 0;
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int triggering = ACPI_LEVEL_SENSITIVE;
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int polarity = ACPI_ACTIVE_LOW;
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char *link = NULL;
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int rc;
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if (!dev)
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return -EINVAL;
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pin = dev->pin;
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if (!pin) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"No interrupt pin configured for device %s\n",
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pci_name(dev)));
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return 0;
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}
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pin--;
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if (!dev->bus) {
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printk(KERN_ERR PREFIX "Invalid (NULL) 'bus' field\n");
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return -ENODEV;
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}
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/*
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* First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
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* values override any BIOS-assigned IRQs set during boot.
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*/
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irq = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
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&triggering, &polarity, &link,
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acpi_pci_allocate_irq);
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/*
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* If no PRT entry was found, we'll try to derive an IRQ from the
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* device's parent bridge.
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*/
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if (irq < 0)
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irq = acpi_pci_irq_derive(dev, pin, &triggering,
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&polarity, &link,
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acpi_pci_allocate_irq);
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/*
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* No IRQ known to the ACPI subsystem - maybe the BIOS /
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* driver reported one, then use it. Exit in any case.
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*/
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if (irq < 0) {
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printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI",
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pci_name(dev), ('A' + pin));
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/* Interrupt Line values above 0xF are forbidden */
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if (dev->irq > 0 && (dev->irq <= 0xF)) {
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printk(" - using IRQ %d\n", dev->irq);
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acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
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ACPI_ACTIVE_LOW);
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return 0;
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} else {
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printk("\n");
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return 0;
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}
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}
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rc = acpi_register_gsi(irq, triggering, polarity);
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if (rc < 0) {
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printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: failed "
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"to register GSI\n", pci_name(dev), ('A' + pin));
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return rc;
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}
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dev->irq = rc;
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printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ",
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pci_name(dev), 'A' + pin);
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if (link)
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printk("Link [%s] -> ", link);
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printk("GSI %u (%s, %s) -> IRQ %d\n", irq,
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(triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
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(polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
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return 0;
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}
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EXPORT_SYMBOL(acpi_pci_irq_enable);
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/* FIXME: implement x86/x86_64 version */
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void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
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{
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}
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void acpi_pci_irq_disable(struct pci_dev *dev)
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{
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int gsi = 0;
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u8 pin = 0;
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int triggering = ACPI_LEVEL_SENSITIVE;
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int polarity = ACPI_ACTIVE_LOW;
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if (!dev || !dev->bus)
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return;
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pin = dev->pin;
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if (!pin)
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return;
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pin--;
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/*
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* First we check the PCI IRQ routing table (PRT) for an IRQ.
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*/
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gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
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&triggering, &polarity, NULL,
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acpi_pci_free_irq);
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/*
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* If no PRT entry was found, we'll try to derive an IRQ from the
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* device's parent bridge.
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*/
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if (gsi < 0)
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gsi = acpi_pci_irq_derive(dev, pin,
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&triggering, &polarity, NULL,
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acpi_pci_free_irq);
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if (gsi < 0)
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return;
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/*
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* TBD: It might be worth clearing dev->irq by magic constant
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* (e.g. PCI_UNDEFINED_IRQ).
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*/
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printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n",
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pci_name(dev));
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acpi_unregister_gsi(gsi);
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return;
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}
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