| /* |
| * 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_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", |
| 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_EXCEPTION((AE_INFO, status, "Evaluating _PRT [%s]", |
| 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 |
| -------------------------------------------------------------------------- */ |
| 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; |
| |
| ACPI_FUNCTION_TRACE("acpi_pci_allocate_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_VALUE(-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_VALUE(irq); |
| } |
| |
| static int |
| acpi_pci_free_irq(struct acpi_prt_entry *entry, |
| int *triggering, int *polarity, char **link) |
| { |
| int irq; |
| |
| ACPI_FUNCTION_TRACE("acpi_pci_free_irq"); |
| if (entry->link.handle) { |
| irq = acpi_pci_link_free_irq(entry->link.handle); |
| } else { |
| irq = entry->link.index; |
| } |
| return_VALUE(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_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); |
| } |
| |
| ret = func(entry, triggering, polarity, link); |
| return_VALUE(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; |
| |
| 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 */ |
| 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_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, triggering, polarity, |
| link, func); |
| } |
| |
| if (irq < 0) { |
| printk(KERN_WARNING PREFIX "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 triggering = ACPI_LEVEL_SENSITIVE; |
| int polarity = ACPI_ACTIVE_LOW; |
| char *link = NULL; |
| int rc; |
| |
| ACPI_FUNCTION_TRACE("acpi_pci_irq_enable"); |
| |
| if (!dev) |
| return_VALUE(-EINVAL); |
| |
| pin = dev->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) { |
| printk(KERN_ERR PREFIX "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, |
| &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); |
| |
| /* |
| * 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); |
| acpi_register_gsi(dev->irq, ACPI_LEVEL_SENSITIVE, |
| ACPI_ACTIVE_LOW); |
| return_VALUE(0); |
| } else { |
| printk("\n"); |
| return_VALUE(0); |
| } |
| } |
| |
| rc = acpi_register_gsi(irq, triggering, polarity); |
| if (rc < 0) { |
| printk(KERN_WARNING PREFIX "PCI Interrupt %s[%c]: failed " |
| "to register GSI\n", pci_name(dev), ('A' + pin)); |
| return_VALUE(rc); |
| } |
| dev->irq = rc; |
| |
| 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, |
| (triggering == ACPI_LEVEL_SENSITIVE) ? "level" : "edge", |
| (polarity == ACPI_ACTIVE_LOW) ? "low" : "high", dev->irq); |
| |
| return_VALUE(0); |
| } |
| |
| EXPORT_SYMBOL(acpi_pci_irq_enable); |
| |
| /* 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; |
| |
| ACPI_FUNCTION_TRACE("acpi_pci_irq_disable"); |
| |
| if (!dev || !dev->bus) |
| return_VOID; |
| |
| pin = dev->pin; |
| if (!pin) |
| return_VOID; |
| 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_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; |
| } |