Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 518 insertions, 0 deletions

diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
new file mode 100644
index 000000000000..12b0eea63407
--- /dev/null
+++ b/drivers/acpi/pci_irq.c
@@ -0,0 +1,518 @@
+/*
+ *  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>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+
+
+#define _COMPONENT		ACPI_PCI_COMPONENT
+ACPI_MODULE_NAME		("pci_irq")
+
+static struct acpi_prt_list	acpi_prt;
+static DEFINE_SPINLOCK(acpi_prt_lock);
+
+/* --------------------------------------------------------------------------
+                         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");
+
+	if (!acpi_prt.count)
+		return_PTR(NULL);
+
+	/*
+	 * 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).
+	 *
+	 */
+	spin_lock(&acpi_prt_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)) {
+			spin_unlock(&acpi_prt_lock);
+			return_PTR(entry);
+		}
+	}
+
+	spin_unlock(&acpi_prt_lock);
+	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));
+
+	spin_lock(&acpi_prt_lock);
+	list_add_tail(&entry->node, &acpi_prt.entries);
+	acpi_prt.count++;
+	spin_unlock(&acpi_prt_lock);
+
+	return_VALUE(0);
+}
+
+
+static void
+acpi_pci_irq_del_entry (
+	int				segment,
+	int				bus,
+	struct acpi_prt_entry		*entry)
+{
+	if (segment == entry->id.segment && bus == entry->id.bus){
+		acpi_prt.count--;
+		list_del(&entry->node);
+		kfree(entry);
+	}
+}
+
+
+int
+acpi_pci_irq_add_prt (
+	acpi_handle		handle,
+	int			segment,
+	int			bus)
+{
+	acpi_status			status = AE_OK;
+	char				*pathname = NULL;
+	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");
+
+	pathname = (char *) kmalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
+	if(!pathname)
+		return_VALUE(-ENOMEM);
+	memset(pathname, 0, ACPI_PATHNAME_MAX);
+
+	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 = ACPI_PATHNAME_MAX;
+	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;
+	kfree(pathname);
+	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);
+}
+
+void
+acpi_pci_irq_del_prt (int segment, int bus)
+{
+	struct list_head        *node = NULL, *n = NULL;
+	struct acpi_prt_entry   *entry = NULL;
+
+	if (!acpi_prt.count)    {
+		return;
+	}
+
+	printk(KERN_DEBUG "ACPI: Delete PCI Interrupt Routing Table for %x:%x\n",
+		segment, bus);
+	spin_lock(&acpi_prt_lock);
+	list_for_each_safe(node, n, &acpi_prt.entries) {
+		entry = list_entry(node, struct acpi_prt_entry, node);
+
+		acpi_pci_irq_del_entry(segment, bus, entry);
+	}
+	spin_unlock(&acpi_prt_lock);
+}
+/* --------------------------------------------------------------------------
+                          PCI Interrupt Routing Support
+   -------------------------------------------------------------------------- */
+
+/*
+ * acpi_pci_irq_lookup
+ * success: return IRQ >= 0
+ * failure: return -1
+ */
+static int
+acpi_pci_irq_lookup (
+	struct pci_bus		*bus,
+	int			device,
+	int			pin,
+	int			*edge_level,
+	int			*active_high_low,
+	char			**link)
+{
+	struct acpi_prt_entry	*entry = NULL;
+	int segment = pci_domain_nr(bus);
+	int bus_nr = bus->number;
+	int irq;
+
+	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_nr, device, ('A' + pin)));
+
+	entry = acpi_pci_irq_find_prt_entry(segment, bus_nr, device, pin); 
+	if (!entry) {
+		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n"));
+		return_VALUE(-1);
+	}
+	
+	if (entry->link.handle) {
+		irq = acpi_pci_link_get_irq(entry->link.handle,
+			entry->link.index, edge_level, active_high_low, link);
+		if (irq < 0) {
+			ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n"));
+			return_VALUE(-1);
+		}
+	} else {
+		irq = entry->link.index;
+		*edge_level = ACPI_LEVEL_SENSITIVE;
+		*active_high_low = ACPI_ACTIVE_LOW;
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
+
+	return_VALUE(irq);
+}
+
+/*
+ * acpi_pci_irq_derive
+ * success: return IRQ >= 0
+ * failure: return < 0
+ */
+static int
+acpi_pci_irq_derive (
+	struct pci_dev		*dev,
+	int			pin,
+	int			*edge_level,
+	int			*active_high_low,
+	char			**link)
+{
+	struct pci_dev		*bridge = dev;
+	int			irq = -1;
+	u8			bridge_pin = 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 (eg. yenta bridge and add-in card bridge).
+	 */
+	while (irq < 0 && bridge->bus->self) {
+		pin = (pin + PCI_SLOT(bridge->devfn)) % 4;
+		bridge = bridge->bus->self;
+
+		if ((bridge->class >> 8) == PCI_CLASS_BRIDGE_CARDBUS) {
+			/* PC card has the same IRQ as its cardbridge */
+			pci_read_config_byte(bridge, PCI_INTERRUPT_PIN, &bridge_pin);
+			if (!bridge_pin) {
+				ACPI_DEBUG_PRINT((ACPI_DB_INFO, 
+					"No interrupt pin configured for device %s\n", pci_name(bridge)));
+				return_VALUE(-1);
+			}
+			/* Pin is from 0 to 3 */
+			bridge_pin --;
+			pin = bridge_pin;
+		}
+
+		irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
+			pin, edge_level, active_high_low, link);
+	}
+
+	if (irq < 0) {
+		ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to derive IRQ for device %s\n", pci_name(dev)));
+		return_VALUE(-1);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
+		irq, pci_name(dev), pci_name(bridge)));
+
+	return_VALUE(irq);
+}
+
+/*
+ * acpi_pci_irq_enable
+ * success: return 0
+ * failure: return < 0
+ */
+
+int
+acpi_pci_irq_enable (
+	struct pci_dev		*dev)
+{
+	int			irq = 0;
+	u8			pin = 0;
+	int			edge_level = ACPI_LEVEL_SENSITIVE;
+	int			active_high_low = ACPI_ACTIVE_LOW;
+	extern int		via_interrupt_line_quirk;
+	char			*link = NULL;
+
+	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", pci_name(dev)));
+		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(dev->bus, PCI_SLOT(dev->devfn), pin,
+		&edge_level, &active_high_low, &link);
+
+	/*
+	 * If no PRT entry was found, we'll try to derive an IRQ from the
+	 * device's parent bridge.
+	 */
+	if (irq < 0)
+ 		irq = acpi_pci_irq_derive(dev, pin, &edge_level,
+			&active_high_low, &link);
+ 
+	/*
+	 * No IRQ known to the ACPI subsystem - maybe the BIOS / 
+	 * driver reported one, then use it. Exit in any case.
+	 */
+	if (irq < 0) {
+		printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: no GSI",
+			pci_name(dev), ('A' + pin));
+		/* Interrupt Line values above 0xF are forbidden */
+		if (dev->irq >= 0 && (dev->irq <= 0xF)) {
+			printk(" - using IRQ %d\n", dev->irq);
+			return_VALUE(0);
+		}
+		else {
+			printk("\n");
+			return_VALUE(0);
+		}
+ 	}
+
+	if (via_interrupt_line_quirk)
+		pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq & 15);
+
+	dev->irq = acpi_register_gsi(irq, edge_level, active_high_low);
+
+	printk(KERN_INFO PREFIX "PCI Interrupt %s[%c] -> ",
+		pci_name(dev), 'A' + pin);
+
+	if (link)
+		printk("Link [%s] -> ", link);
+
+	printk("GSI %u (%s, %s) -> IRQ %d\n", irq,
+		(edge_level == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
+		(active_high_low == ACPI_ACTIVE_LOW) ? "low" : "high",
+		dev->irq);
+
+	return_VALUE(0);
+}
+EXPORT_SYMBOL(acpi_pci_irq_enable);
+
+
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+void
+acpi_pci_irq_disable (
+	struct pci_dev		*dev)
+{
+	int			gsi = 0;
+	u8			pin = 0;
+	int			edge_level = ACPI_LEVEL_SENSITIVE;
+	int			active_high_low = ACPI_ACTIVE_LOW;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_irq_disable");
+
+	if (!dev)
+		return_VOID;
+
+	pci_read_config_byte(dev, PCI_INTERRUPT_PIN, &pin);
+	if (!pin)
+		return_VOID;
+	pin--;
+
+	if (!dev->bus)
+		return_VOID;
+
+	/*
+	 * First we check the PCI IRQ routing table (PRT) for an IRQ.
+	 */
+ 	gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
+				  &edge_level, &active_high_low, NULL);
+	/*
+	 * If no PRT entry was found, we'll try to derive an IRQ from the
+	 * device's parent bridge.
+	 */
+	if (gsi < 0)
+ 		gsi = acpi_pci_irq_derive(dev, pin,
+					  &edge_level, &active_high_low, NULL);
+	if (gsi < 0)
+		return_VOID;
+
+	/*
+	 * TBD: It might be worth clearing dev->irq by magic constant
+	 * (e.g. PCI_UNDEFINED_IRQ).
+	 */
+
+	printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n",
+	       pci_name(dev));
+
+	acpi_unregister_gsi(gsi);
+
+	return_VOID;
+}
+#endif /* CONFIG_ACPI_DEALLOCATE_IRQ */