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-rw-r--r--drivers/acpi/pci_irq.c621
1 files changed, 621 insertions, 0 deletions
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
new file mode 100644
index 0000000..11acaee
--- /dev/null
+++ b/drivers/acpi/pci_irq.c
@@ -0,0 +1,621 @@
+/*
+ * 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/dmi.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 acpi_prt_entry *entry = NULL;
+
+ if (!acpi_prt.count)
+ return 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_entry(entry, &acpi_prt.entries, node) {
+ if ((segment == entry->id.segment)
+ && (bus == entry->id.bus)
+ && (device == entry->id.device)
+ && (pin == entry->pin)) {
+ spin_unlock(&acpi_prt_lock);
+ return entry;
+ }
+ }
+
+ spin_unlock(&acpi_prt_lock);
+ return NULL;
+}
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=4773 */
+static struct dmi_system_id medion_md9580[] = {
+ {
+ .ident = "Medion MD9580-F laptop",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "MEDIONNB"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "A555"),
+ },
+ },
+ { }
+};
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=5044 */
+static struct dmi_system_id dell_optiplex[] = {
+ {
+ .ident = "Dell Optiplex GX1",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex GX1 600S+"),
+ },
+ },
+ { }
+};
+
+/* http://bugzilla.kernel.org/show_bug.cgi?id=10138 */
+static struct dmi_system_id hp_t5710[] = {
+ {
+ .ident = "HP t5710",
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "hp t5000 series"),
+ DMI_MATCH(DMI_BOARD_NAME, "098Ch"),
+ },
+ },
+ { }
+};
+
+struct prt_quirk {
+ struct dmi_system_id *system;
+ unsigned int segment;
+ unsigned int bus;
+ unsigned int device;
+ unsigned char pin;
+ char *source; /* according to BIOS */
+ char *actual_source;
+};
+
+/*
+ * These systems have incorrect _PRT entries. The BIOS claims the PCI
+ * interrupt at the listed segment/bus/device/pin is connected to the first
+ * link device, but it is actually connected to the second.
+ */
+static struct prt_quirk prt_quirks[] = {
+ { medion_md9580, 0, 0, 9, 'A',
+ "\\_SB_.PCI0.ISA_.LNKA",
+ "\\_SB_.PCI0.ISA_.LNKB"},
+ { dell_optiplex, 0, 0, 0xd, 'A',
+ "\\_SB_.LNKB",
+ "\\_SB_.LNKA"},
+ { hp_t5710, 0, 0, 1, 'A',
+ "\\_SB_.PCI0.LNK1",
+ "\\_SB_.PCI0.LNK3"},
+};
+
+static void
+do_prt_fixups(struct acpi_prt_entry *entry, struct acpi_pci_routing_table *prt)
+{
+ int i;
+ struct prt_quirk *quirk;
+
+ for (i = 0; i < ARRAY_SIZE(prt_quirks); i++) {
+ quirk = &prt_quirks[i];
+
+ /* All current quirks involve link devices, not GSIs */
+ if (!prt->source)
+ continue;
+
+ if (dmi_check_system(quirk->system) &&
+ entry->id.segment == quirk->segment &&
+ entry->id.bus == quirk->bus &&
+ entry->id.device == quirk->device &&
+ entry->pin + 'A' == quirk->pin &&
+ !strcmp(prt->source, quirk->source) &&
+ strlen(prt->source) >= strlen(quirk->actual_source)) {
+ printk(KERN_WARNING PREFIX "firmware reports "
+ "%04x:%02x:%02x PCI INT %c connected to %s; "
+ "changing to %s\n",
+ entry->id.segment, entry->id.bus,
+ entry->id.device, 'A' + entry->pin,
+ prt->source, quirk->actual_source);
+ strcpy(prt->source, quirk->actual_source);
+ }
+ }
+}
+
+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;
+
+
+ if (!prt)
+ return -EINVAL;
+
+ entry = kzalloc(sizeof(struct acpi_prt_entry), GFP_KERNEL);
+ if (!entry)
+ return -ENOMEM;
+
+ 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;
+
+ do_prt_fixups(entry, prt);
+
+ /*
+ * 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 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;
+
+
+ pathname = kzalloc(ACPI_PATHNAME_MAX, GFP_KERNEL);
+ if (!pathname)
+ return -ENOMEM;
+
+ 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_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
+ acpi_format_exception(status)));
+ return -ENODEV;
+ }
+
+ prt = kzalloc(buffer.length, GFP_KERNEL);
+ if (!prt) {
+ return -ENOMEM;
+ }
+ buffer.pointer = prt;
+
+ status = acpi_get_irq_routing_table(handle, &buffer);
+ if (ACPI_FAILURE(status)) {
+ ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]",
+ acpi_format_exception(status)));
+ kfree(buffer.pointer);
+ return -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 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
+ -------------------------------------------------------------------------- */
+typedef int (*irq_lookup_func) (struct acpi_prt_entry *, int *, int *, char **);
+
+static int
+acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
+ int *triggering, int *polarity, char **link)
+{
+ int irq;
+
+
+ if (entry->link.handle) {
+ irq = acpi_pci_link_allocate_irq(entry->link.handle,
+ entry->link.index, triggering,
+ polarity, link);
+ if (irq < 0) {
+ printk(KERN_WARNING PREFIX
+ "Invalid IRQ link routing entry\n");
+ return -1;
+ }
+ } else {
+ irq = entry->link.index;
+ *triggering = ACPI_LEVEL_SENSITIVE;
+ *polarity = ACPI_ACTIVE_LOW;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", irq));
+ return irq;
+}
+
+static int
+acpi_pci_free_irq(struct acpi_prt_entry *entry,
+ int *triggering, int *polarity, char **link)
+{
+ int irq;
+
+ if (entry->link.handle) {
+ irq = acpi_pci_link_free_irq(entry->link.handle);
+ } else {
+ irq = entry->link.index;
+ }
+ return irq;
+}
+
+/*
+ * 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 *triggering,
+ int *polarity, char **link, irq_lookup_func func)
+{
+ struct acpi_prt_entry *entry = NULL;
+ int segment = pci_domain_nr(bus);
+ int bus_nr = bus->number;
+ int ret;
+
+
+ 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 -1;
+ }
+
+ ret = func(entry, triggering, polarity, link);
+ return ret;
+}
+
+/*
+ * acpi_pci_irq_derive
+ * success: return IRQ >= 0
+ * failure: return < 0
+ */
+static int
+acpi_pci_irq_derive(struct pci_dev *dev,
+ int pin,
+ int *triggering,
+ int *polarity, char **link, irq_lookup_func func)
+{
+ struct pci_dev *bridge = dev;
+ int irq = -1;
+ u8 bridge_pin = 0, orig_pin = pin;
+
+
+ if (!dev)
+ return -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 */
+ bridge_pin = bridge->pin;
+ if (!bridge_pin) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "No interrupt pin configured for device %s\n",
+ pci_name(bridge)));
+ return -1;
+ }
+ /* Pin is from 0 to 3 */
+ bridge_pin--;
+ pin = bridge_pin;
+ }
+
+ irq = acpi_pci_irq_lookup(bridge->bus, PCI_SLOT(bridge->devfn),
+ pin, triggering, polarity,
+ link, func);
+ }
+
+ if (irq < 0) {
+ dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
+ 'A' + orig_pin);
+ return -1;
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derive IRQ %d for device %s from %s\n",
+ irq, pci_name(dev), pci_name(bridge)));
+
+ return 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 triggering = ACPI_LEVEL_SENSITIVE;
+ int polarity = ACPI_ACTIVE_LOW;
+ char *link = NULL;
+ char link_desc[16];
+ int rc;
+
+
+ if (!dev)
+ return -EINVAL;
+
+ pin = dev->pin;
+ if (!pin) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "No interrupt pin configured for device %s\n",
+ pci_name(dev)));
+ return 0;
+ }
+ pin--;
+
+ if (!dev->bus) {
+ dev_err(&dev->dev, "invalid (NULL) 'bus' field\n");
+ return -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,
+ &triggering, &polarity, &link,
+ acpi_pci_allocate_irq);
+
+ /*
+ * 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, &triggering,
+ &polarity, &link,
+ acpi_pci_allocate_irq);
+
+ if (irq < 0) {
+ /*
+ * IDE legacy mode controller IRQs are magic. Why do compat
+ * extensions always make such a nasty mess.
+ */
+ if (dev->class >> 8 == PCI_CLASS_STORAGE_IDE &&
+ (dev->class & 0x05) == 0)
+ return 0;
+ }
+ /*
+ * No IRQ known to the ACPI subsystem - maybe the BIOS /
+ * driver reported one, then use it. Exit in any case.
+ */
+ if (irq < 0) {
+ dev_warn(&dev->dev, "PCI INT %c: no GSI", 'A' + pin);
+ /* Interrupt Line values above 0xF are forbidden */
+ if (dev->irq > 0 && (dev->irq <= 0xF)) {
+ printk(" - using IRQ %d\n", dev->irq);
+ acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE,
+ ACPI_ACTIVE_LOW);
+ return 0;
+ } else {
+ printk("\n");
+ return 0;
+ }
+ }
+
+ rc = acpi_register_gsi(irq, triggering, polarity);
+ if (rc < 0) {
+ dev_warn(&dev->dev, "PCI INT %c: failed to register GSI\n",
+ 'A' + pin);
+ return rc;
+ }
+ dev->irq = rc;
+
+ if (link)
+ snprintf(link_desc, sizeof(link_desc), " -> Link[%s]", link);
+ else
+ link_desc[0] = '\0';
+
+ dev_info(&dev->dev, "PCI INT %c%s -> GSI %u (%s, %s) -> IRQ %d\n",
+ 'A' + pin, link_desc, irq,
+ (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge",
+ (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq);
+
+ return 0;
+}
+
+/* FIXME: implement x86/x86_64 version */
+void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
+{
+}
+
+void acpi_pci_irq_disable(struct pci_dev *dev)
+{
+ int gsi = 0;
+ u8 pin = 0;
+ int triggering = ACPI_LEVEL_SENSITIVE;
+ int polarity = ACPI_ACTIVE_LOW;
+
+
+ if (!dev || !dev->bus)
+ return;
+
+ pin = dev->pin;
+ if (!pin)
+ return;
+ pin--;
+
+ /*
+ * First we check the PCI IRQ routing table (PRT) for an IRQ.
+ */
+ gsi = acpi_pci_irq_lookup(dev->bus, PCI_SLOT(dev->devfn), pin,
+ &triggering, &polarity, NULL,
+ acpi_pci_free_irq);
+ /*
+ * 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,
+ &triggering, &polarity, NULL,
+ acpi_pci_free_irq);
+ if (gsi < 0)
+ return;
+
+ /*
+ * TBD: It might be worth clearing dev->irq by magic constant
+ * (e.g. PCI_UNDEFINED_IRQ).
+ */
+
+ dev_info(&dev->dev, "PCI INT %c disabled\n", 'A' + pin);
+ acpi_unregister_gsi(gsi);
+}
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