diff options
Diffstat (limited to 'drivers/acpi/pci_irq.c')
-rw-r--r-- | drivers/acpi/pci_irq.c | 621 |
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); +} |