summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/pci_irq.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/acpi/pci_irq.c')
-rw-r--r--drivers/acpi/pci_irq.c518
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 00000000000..12b0eea6340
--- /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 */
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 09:06:03 +0000