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path: root/drivers/acpi/pci_irq.c
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Diffstat (limited to 'drivers/acpi/pci_irq.c')
-rw-r--r--drivers/acpi/pci_irq.c93
1 files changed, 36 insertions, 57 deletions
diff --git a/drivers/acpi/pci_irq.c b/drivers/acpi/pci_irq.c
index 7978c97afb0a..28338227dd5e 100644
--- a/drivers/acpi/pci_irq.c
+++ b/drivers/acpi/pci_irq.c
@@ -339,8 +339,6 @@ void acpi_pci_irq_del_prt(int segment, int bus)
/* --------------------------------------------------------------------------
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)
@@ -368,8 +366,7 @@ acpi_pci_allocate_irq(struct acpi_prt_entry *entry,
}
static int
-acpi_pci_free_irq(struct acpi_prt_entry *entry,
- int *triggering, int *polarity, char **link)
+acpi_pci_free_irq(struct acpi_prt_entry *entry)
{
int irq;
@@ -381,47 +378,29 @@ acpi_pci_free_irq(struct acpi_prt_entry *entry,
return irq;
}
-/*
- * acpi_pci_irq_lookup
- * success: return IRQ >= 0
- * failure: return -1
- */
-static int
-acpi_pci_irq_lookup(struct pci_dev *dev, int pin,
- int *triggering,
- int *polarity, char **link, irq_lookup_func func)
+static struct acpi_prt_entry *
+acpi_pci_irq_lookup(struct pci_dev *dev, int pin)
{
- struct acpi_prt_entry *entry = NULL;
- int ret;
-
+ struct acpi_prt_entry *entry;
entry = acpi_pci_irq_find_prt_entry(dev, pin);
if (!entry) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "No %s[%c] _PRT entry\n",
pci_name(dev), pin_name(pin)));
- return -1;
+ return NULL;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %s[%c] _PRT entry\n",
pci_name(dev), pin_name(pin)));
- ret = func(entry, triggering, polarity, link);
- return ret;
+ return entry;
}
-/*
- * 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)
+static struct acpi_prt_entry *
+acpi_pci_irq_derive(struct pci_dev *dev, int pin)
{
+ struct acpi_prt_entry *entry = NULL;
struct pci_dev *bridge = dev;
- int irq = -1;
u8 bridge_pin = 0, orig_pin = pin;
@@ -429,7 +408,7 @@ acpi_pci_irq_derive(struct pci_dev *dev,
* 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) {
+ while (!entry && bridge->bus->self) {
pin = (((pin - 1) + PCI_SLOT(bridge->devfn)) % 4) + 1;
bridge = bridge->bus->self;
@@ -440,26 +419,24 @@ acpi_pci_irq_derive(struct pci_dev *dev,
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"No interrupt pin configured for device %s\n",
pci_name(bridge)));
- return -1;
+ return NULL;
}
pin = bridge_pin;
}
- irq = acpi_pci_irq_lookup(bridge,
- pin, triggering, polarity,
- link, func);
+ entry = acpi_pci_irq_lookup(bridge, pin);
}
- if (irq < 0) {
+ if (!entry) {
dev_warn(&dev->dev, "can't derive routing for PCI INT %c\n",
pin_name(orig_pin));
- return -1;
+ return NULL;
}
- ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derived GSI %d for %s INT %c from %s\n",
- irq, pci_name(dev), pin_name(orig_pin), pci_name(bridge)));
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Derived GSI for %s INT %c from %s\n",
+ pci_name(dev), pin_name(orig_pin), pci_name(bridge)));
- return irq;
+ return entry;
}
/*
@@ -470,6 +447,7 @@ acpi_pci_irq_derive(struct pci_dev *dev,
int acpi_pci_irq_enable(struct pci_dev *dev)
{
+ struct acpi_prt_entry *entry;
int gsi = 0;
u8 pin = 0;
int triggering = ACPI_LEVEL_SENSITIVE;
@@ -491,18 +469,20 @@ int acpi_pci_irq_enable(struct pci_dev *dev)
* First we check the PCI IRQ routing table (PRT) for an IRQ. PRT
* values override any BIOS-assigned IRQs set during boot.
*/
- gsi = acpi_pci_irq_lookup(dev, pin,
- &triggering, &polarity, &link,
- acpi_pci_allocate_irq);
+ entry = acpi_pci_irq_lookup(dev, pin);
/*
* 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, &link,
- acpi_pci_allocate_irq);
+ if (!entry)
+ entry = acpi_pci_irq_derive(dev, pin);
+
+ if (entry)
+ gsi = acpi_pci_allocate_irq(entry, &triggering, &polarity,
+ &link);
+ else
+ gsi = -1;
if (gsi < 0) {
/*
@@ -559,10 +539,9 @@ void __attribute__ ((weak)) acpi_unregister_gsi(u32 i)
void acpi_pci_irq_disable(struct pci_dev *dev)
{
+ struct acpi_prt_entry *entry;
int gsi = 0;
u8 pin = 0;
- int triggering = ACPI_LEVEL_SENSITIVE;
- int polarity = ACPI_ACTIVE_LOW;
pin = dev->pin;
@@ -572,20 +551,20 @@ void acpi_pci_irq_disable(struct pci_dev *dev)
/*
* First we check the PCI IRQ routing table (PRT) for an IRQ.
*/
- gsi = acpi_pci_irq_lookup(dev, pin,
- &triggering, &polarity, NULL,
- acpi_pci_free_irq);
+ entry = acpi_pci_irq_lookup(dev, pin);
+
/*
* 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)
+ if (!entry)
+ entry = acpi_pci_irq_derive(dev, pin);
+
+ if (!entry)
return;
+ gsi = acpi_pci_free_irq(entry);
+
/*
* TBD: It might be worth clearing dev->irq by magic constant
* (e.g. PCI_UNDEFINED_IRQ).
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-16 06:44:57 +0300