patch-2.4.22 linux-2.4.22/drivers/acpi/pci_irq.c

• Lines: 423
• Date: 2003-08-25 04:44:41.000000000 -0700
• Orig file: linux-2.4.21/drivers/acpi/pci_irq.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/drivers/acpi/pci_irq.c linux-2.4.22/drivers/acpi/pci_irq.c
@@ -0,0 +1,422 @@
+/*
+ *  pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $)
+ *
+ *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
+ *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
+ *  Copyright (C) 2002       Dominik Brodowski <devel@brodo.de>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#include <linux/config.h>
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/proc_fs.h>
+#include <linux/spinlock.h>
+#include <linux/pm.h>
+#include <linux/pci.h>
+#include <linux/acpi.h>
+#ifdef CONFIG_X86_IO_APIC
+#include <asm/mpspec.h>
+#endif
+#ifdef CONFIG_IOSAPIC
+# include <asm/iosapic.h>
+#endif
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define _COMPONENT		ACPI_PCI_COMPONENT
+ACPI_MODULE_NAME		("pci_irq")
+
+#define PREFIX			"PCI: "
+
+struct acpi_prt_list		acpi_prt;
+
+#ifdef CONFIG_X86
+extern void eisa_set_level_irq(unsigned int irq);
+#endif
+
+
+/* --------------------------------------------------------------------------
+                         PCI IRQ Routing Table (PRT) Support
+   -------------------------------------------------------------------------- */
+
+static struct acpi_prt_entry *
+acpi_pci_irq_find_prt_entry (
+	int			segment,
+	int			bus,
+	int			device,
+	int			pin)
+{
+	struct list_head	*node = NULL;
+	struct acpi_prt_entry	*entry = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_find_prt_entry");
+
+	/*
+	 * Parse through all PRT entries looking for a match on the specified
+	 * PCI device's segment, bus, device, and pin (don't care about func).
+	 *
+	 * TBD: Acquire/release lock
+	 */
+	list_for_each(node, &acpi_prt.entries) {
+		entry = list_entry(node, struct acpi_prt_entry, node);
+		if ((segment == entry->id.segment) 
+			&& (bus == entry->id.bus) 
+			&& (device == entry->id.device)
+			&& (pin == entry->pin)) {
+			return_PTR(entry);
+		}
+	}
+
+	return_PTR(NULL);
+}
+
+
+static int
+acpi_pci_irq_add_entry (
+	acpi_handle			handle,
+	int				segment,
+	int				bus,
+	struct acpi_pci_routing_table	*prt)
+{
+	struct acpi_prt_entry	*entry = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_add_entry");
+
+	if (!prt)
+		return_VALUE(-EINVAL);
+
+	entry = kmalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
+	if (!entry)
+		return_VALUE(-ENOMEM);
+	memset(entry, 0, sizeof(struct acpi_prt_entry));
+
+	entry->id.segment = segment;
+	entry->id.bus = bus;
+	entry->id.device = (prt->address >> 16) & 0xFFFF;
+	entry->id.function = prt->address & 0xFFFF;
+	entry->pin = prt->pin;
+
+	/*
+	 * Type 1: Dynamic
+	 * ---------------
+	 * The 'source' field specifies the PCI interrupt link device used to
+	 * configure the IRQ assigned to this slot|dev|pin.  The 'source_index'
+	 * indicates which resource descriptor in the resource template (of
+	 * the link device) this interrupt is allocated from.
+	 * 
+	 * NOTE: Don't query the Link Device for IRQ information at this time
+	 *       because Link Device enumeration may not have occurred yet
+	 *       (e.g. exists somewhere 'below' this _PRT entry in the ACPI
+	 *       namespace).
+	 */
+	if (prt->source[0]) {
+		acpi_get_handle(handle, prt->source, &entry->link.handle);
+		entry->link.index = prt->source_index;
+	}
+	/*
+	 * Type 2: Static
+	 * --------------
+	 * The 'source' field is NULL, and the 'source_index' field specifies
+	 * the IRQ value, which is hardwired to specific interrupt inputs on
+	 * the interrupt controller.
+	 */
+	else
+		entry->link.index = prt->source_index;
+
+	ACPI_DEBUG_PRINT_RAW((ACPI_DB_INFO,
+		"      %02X:%02X:%02X[%c] -> %s[%d]\n", 
+		entry->id.segment, entry->id.bus, entry->id.device, 
+		('A' + entry->pin), prt->source, entry->link.index));
+
+	/* TBD: Acquire/release lock */
+	list_add_tail(&entry->node, &acpi_prt.entries);
+	acpi_prt.count++;
+
+	return_VALUE(0);
+}
+
+
+int
+acpi_pci_irq_add_prt (
+	acpi_handle		handle,
+	int			segment,
+	int			bus)
+{
+	acpi_status			status = AE_OK;
+	char				pathname[ACPI_PATHNAME_MAX] = {0};
+	struct acpi_buffer		buffer = {0, NULL};
+	struct acpi_pci_routing_table	*prt = NULL;
+	struct acpi_pci_routing_table	*entry = NULL;
+	static int			first_time = 1;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_add_prt");
+
+	if (first_time) {
+		acpi_prt.count = 0;
+		INIT_LIST_HEAD(&acpi_prt.entries);
+		first_time = 0;
+	}
+
+	/* 
+	 * NOTE: We're given a 'handle' to the _PRT object's parent device
+	 *       (either a PCI root bridge or PCI-PCI bridge).
+	 */
+
+	buffer.length = sizeof(pathname);
+	buffer.pointer = pathname;
+	acpi_get_name(handle, ACPI_FULL_PATHNAME, &buffer);
+
+	printk(KERN_DEBUG "ACPI: PCI Interrupt Routing Table [%s._PRT]\n",
+		pathname);
+
+	/* 
+	 * Evaluate this _PRT and add its entries to our global list (acpi_prt).
+	 */
+
+	buffer.length = 0;
+	buffer.pointer = NULL;
+	status = acpi_get_irq_routing_table(handle, &buffer);
+	if (status != AE_BUFFER_OVERFLOW) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n",
+			acpi_format_exception(status)));
+		return_VALUE(-ENODEV);
+	}
+
+	prt = kmalloc(buffer.length, GFP_KERNEL);
+	if (!prt)
+		return_VALUE(-ENOMEM);
+	memset(prt, 0, buffer.length);
+	buffer.pointer = prt;
+
+	status = acpi_get_irq_routing_table(handle, &buffer);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRT [%s]\n",
+			acpi_format_exception(status)));
+		kfree(buffer.pointer);
+		return_VALUE(-ENODEV);
+	}
+
+	entry = prt;
+
+	while (entry && (entry->length > 0)) {
+		acpi_pci_irq_add_entry(handle, segment, bus, entry);
+		entry = (struct acpi_pci_routing_table *)
+			((unsigned long) entry + entry->length);
+	}
+
+	kfree(prt);
+
+	return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+                          PCI Interrupt Routing Support
+   -------------------------------------------------------------------------- */
+
+int
+acpi_pci_irq_lookup (
+	int			segment,
+	int			bus,
+	int			device,
+	int			pin)
+{
+	struct acpi_prt_entry	*entry = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_lookup");
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, 
+		"Searching for PRT entry for %02x:%02x:%02x[%c]\n", 
+		segment, bus, device, ('A' + pin)));
+
+	entry = acpi_pci_irq_find_prt_entry(segment, bus, device, pin); 
+	if (!entry) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n"));
+		return_VALUE(0);
+	}
+
+	if (!entry->irq && entry->link.handle) {
+		entry->irq = acpi_pci_link_get_irq(entry->link.handle, entry->link.index, NULL, NULL);
+		if (!entry->irq) {
+			ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n"));
+			return_VALUE(0);
+		}
+	}
+	else if (!entry->irq) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid static routing entry (IRQ 0)\n"));
+		return_VALUE(0);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", entry->irq));
+
+	return_VALUE(entry->irq);
+}
+
+
+static int
+acpi_pci_irq_derive (
+	struct pci_dev		*dev,
+	int			pin)
+{
+	struct pci_dev		*bridge = dev;
+	int			irq = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_derive");
+
+	if (!dev)
+		return_VALUE(-EINVAL);
+
+	/* 
+	 * Attempt to derive an IRQ for this device from a parent bridge's
+	 * PCI interrupt routing entry (a.k.a. the "bridge swizzle").
+	 */
+	while (!irq && bridge->bus->self) {
+		pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
+		bridge = bridge->bus->self;
+		irq = acpi_pci_irq_lookup(0, bridge->bus->number, PCI_SLOT(bridge->devfn), pin);
+	}
+
+	if (!irq) {
+		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to derive IRQ for device %s\n", dev->slot_name));
+		return_VALUE(0);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derived IRQ %d\n", irq));
+
+	return_VALUE(irq);
+}
+
+
+int
+acpi_pci_irq_enable (
+	struct pci_dev		*dev)
+{
+	int			irq = 0;
+	u8			pin = 0;
+	static u16		irq_mask = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_enable");
+
+	if (!dev)
+		return_VALUE(-EINVAL);
+	
+	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+	if (!pin) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No interrupt pin configured for device %s\n", dev->slot_name));
+		return_VALUE(0);
+	}
+	pin--;
+
+	if (!dev->bus) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid (NULL) 'bus' field\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	/* 
+	 * First we check the PCI IRQ routing table (PRT) for an IRQ.  PRT
+	 * values override any BIOS-assigned IRQs set during boot.
+	 */
+ 	irq = acpi_pci_irq_lookup(0, dev->bus->number, PCI_SLOT(dev->devfn), pin);
+ 
+	/*
+	 * If no PRT entry was found, we'll try to derive an IRQ from the
+	 * device's parent bridge.
+	 */
+	if (!irq)
+ 		irq = acpi_pci_irq_derive(dev, pin);
+ 
+	/*
+	 * No IRQ known to the ACPI subsystem - maybe the BIOS / 
+	 * driver reported one, then use it. Exit in any case.
+	 */
+	if (!irq) {
+		printk(KERN_WARNING PREFIX "No IRQ known for interrupt pin %c of device %s", ('A' + pin), dev->slot_name);
+		/* Interrupt Line values above 0xF are forbidden */
+		if (dev->irq && dev->irq >= 0xF) {
+			printk(" - using IRQ %d\n", dev->irq);
+			return_VALUE(dev->irq);
+		}
+		else {
+			printk("\n");
+			return_VALUE(0);
+		}
+ 	}
+
+	dev->irq = irq;
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device %s using IRQ %d\n", dev->slot_name, dev->irq));
+
+	/* 
+	 * Make sure all (legacy) PCI IRQs are set as level-triggered.
+	 */
+#ifdef CONFIG_X86
+	if ((dev->irq < 16) &&  !((1 << dev->irq) & irq_mask)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Setting IRQ %d as level-triggered\n", dev->irq));
+		irq_mask |= (1 << dev->irq);
+		eisa_set_level_irq(dev->irq);
+	}
+#endif
+#ifdef CONFIG_IOSAPIC
+	if (acpi_irq_model == ACPI_IRQ_MODEL_IOSAPIC)
+		iosapic_enable_intr(dev->irq);
+#endif
+
+	return_VALUE(dev->irq);
+}
+
+
+int __init
+acpi_pci_irq_init (void)
+{
+	struct pci_dev          *dev = NULL;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_init");
+
+	if (!acpi_prt.count) {
+		printk(KERN_WARNING PREFIX "ACPI tables contain no PCI IRQ "
+			"routing entries\n");
+		return_VALUE(-ENODEV);
+	}
+
+	/* Make sure all link devices have a valid IRQ. */
+	if (acpi_pci_link_check()) {
+		return_VALUE(-ENODEV);
+	}
+
+#ifdef CONFIG_X86_IO_APIC
+	/* Program IOAPICs using data from PRT entries. */
+	if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
+		mp_parse_prt();
+#endif
+#ifdef CONFIG_IOSAPIC
+	if (acpi_irq_model == ACPI_IRQ_MODEL_IOSAPIC)
+		iosapic_parse_prt();
+#endif
+
+	pci_for_each_dev(dev)
+		acpi_pci_irq_enable(dev);
+
+	return_VALUE(0);
+}