96c2a8766b
When PCI IDE controller works in legacy mode and no PRT entry is found in ACPI PRT table, OSPM will neither read the irq number from the IDE PCI configuration space nor call the function of acpi_register_gsi to register gsi. http://bugzilla.kernel.org/show_bug.cgi?id=5637 Signed-off-by: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
533 lines
13 KiB
C
533 lines
13 KiB
C
/*
|
|
* 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/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;
|
|
|
|
|
|
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(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 entry;
|
|
}
|
|
}
|
|
|
|
spin_unlock(&acpi_prt_lock);
|
|
return 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;
|
|
|
|
|
|
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;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
|
|
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) {
|
|
printk(KERN_WARNING PREFIX "Unable to derive IRQ for device %s\n",
|
|
pci_name(dev));
|
|
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;
|
|
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) {
|
|
printk(KERN_ERR PREFIX "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) {
|
|
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 0;
|
|
} else {
|
|
printk("\n");
|
|
return 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 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 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;
|
|
|
|
|
|
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).
|
|
*/
|
|
|
|
printk(KERN_INFO PREFIX "PCI interrupt for device %s disabled\n",
|
|
pci_name(dev));
|
|
|
|
acpi_unregister_gsi(gsi);
|
|
|
|
return;
|
|
}
|