/* * pci_irq.c - ACPI PCI Interrupt Routing ($Revision: 11 $) * * Copyright (C) 2001, 2002 Andy Grover * Copyright (C) 2001, 2002 Paul Diefenbaugh * Copyright (C) 2002 Dominik Brodowski * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * * 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 #include #include #include #include #include #include #include #include #include #ifdef CONFIG_X86_IO_APIC #include #endif #ifdef CONFIG_IOSAPIC # include #endif #include #include #define _COMPONENT ACPI_PCI_COMPONENT ACPI_MODULE_NAME ("pci_irq") #define PREFIX "PCI: " struct acpi_prt_list acpi_prt; #ifdef CONFIG_X86 extern void eisa_set_level_irq(unsigned int irq); #endif /* -------------------------------------------------------------------------- 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). * * TBD: Acquire/release 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)) { return_PTR(entry); } } 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)); /* TBD: Acquire/release lock */ list_add_tail(&entry->node, &acpi_prt.entries); acpi_prt.count++; return_VALUE(0); } int acpi_pci_irq_add_prt ( acpi_handle handle, int segment, int bus) { acpi_status status = AE_OK; char pathname[ACPI_PATHNAME_MAX] = {0}; 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"); 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 = sizeof(pathname); 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; 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); } /* -------------------------------------------------------------------------- PCI Interrupt Routing Support -------------------------------------------------------------------------- */ int acpi_pci_irq_lookup ( int segment, int bus, int device, int pin) { struct acpi_prt_entry *entry = NULL; 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, device, ('A' + pin))); entry = acpi_pci_irq_find_prt_entry(segment, bus, device, pin); if (!entry) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "PRT entry not found\n")); return_VALUE(0); } if (!entry->irq && entry->link.handle) { entry->irq = acpi_pci_link_get_irq(entry->link.handle, entry->link.index, NULL, NULL); if (!entry->irq) { ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ link routing entry\n")); return_VALUE(0); } } else if (!entry->irq) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Invalid static routing entry (IRQ 0)\n")); return_VALUE(0); } ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found IRQ %d\n", entry->irq)); return_VALUE(entry->irq); } static int acpi_pci_irq_derive ( struct pci_dev *dev, int pin) { struct pci_dev *bridge = dev; int irq = 0; 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 && 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(0); } /* Pin is from 0 to 3 */ bridge_pin --; pin = bridge_pin; } irq = acpi_pci_irq_lookup(0, bridge->bus->number, PCI_SLOT(bridge->devfn), pin); } if (!irq) { ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Unable to derive IRQ for device %s\n", dev->slot_name)); return_VALUE(0); } 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); } int acpi_pci_irq_enable ( struct pci_dev *dev) { int irq = 0; u8 pin = 0; extern int via_interrupt_line_quirk; 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", dev->slot_name)); 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(0, dev->bus->number, PCI_SLOT(dev->devfn), pin); /* * If no PRT entry was found, we'll try to derive an IRQ from the * device's parent bridge. */ if (!irq) irq = acpi_pci_irq_derive(dev, pin); /* * No IRQ known to the ACPI subsystem - maybe the BIOS / * driver reported one, then use it. Exit in any case. */ if (!irq) { printk(KERN_WARNING PREFIX "No IRQ known for interrupt pin %c of device %s", ('A' + pin), dev->slot_name); /* Interrupt Line values above 0xF are forbidden */ if (dev->irq && (dev->irq <= 0xF)) { printk(" - using IRQ %d\n", dev->irq); return_VALUE(dev->irq); } else { printk("\n"); return_VALUE(0); } } if (via_interrupt_line_quirk) pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq & 15); dev->irq = irq; ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device %s using IRQ %d\n", dev->slot_name, dev->irq)); /* * Make sure all (legacy) PCI IRQs are set as level-triggered. */ #ifdef CONFIG_X86 { static u16 irq_mask; if ((dev->irq < 16) && !((1 << dev->irq) & irq_mask)) { ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Setting IRQ %d as level-triggered\n", dev->irq)); irq_mask |= (1 << dev->irq); eisa_set_level_irq(dev->irq); } } #endif #ifdef CONFIG_IOSAPIC if (acpi_irq_model == ACPI_IRQ_MODEL_IOSAPIC) iosapic_enable_intr(dev->irq); #endif return_VALUE(dev->irq); } int __init acpi_pci_irq_init (void) { struct pci_dev *dev = NULL; ACPI_FUNCTION_TRACE("acpi_pci_irq_init"); if (!acpi_prt.count) { printk(KERN_WARNING PREFIX "ACPI tables contain no PCI IRQ " "routing entries\n"); return_VALUE(-ENODEV); } /* Make sure all link devices have a valid IRQ. */ if (acpi_pci_link_check()) { return_VALUE(-ENODEV); } #ifdef CONFIG_X86_IO_APIC /* Program IOAPICs using data from PRT entries. */ if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC) mp_parse_prt(); #endif #ifdef CONFIG_IOSAPIC if (acpi_irq_model == ACPI_IRQ_MODEL_IOSAPIC) iosapic_parse_prt(); #endif pci_for_each_dev(dev) acpi_pci_irq_enable(dev); return_VALUE(0); }