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 */