Some chips have weird bit mask access patterns instead of the linear
you expect. Allow them to calculate the cached mask themself.
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
---
include/linux/irq.h | 3 +++
kernel/irq/generic-chip.c | 8 ++++++--
2 files changed, 9 insertions(+), 2 deletions(-)
Index: linux-2.6/include/linux/irq.h
===================================================================
--- linux-2.6.orig/include/linux/irq.h
+++ linux-2.6/include/linux/irq.h
@@ -296,6 +296,7 @@ static inline irq_hw_number_t irqd_to_hw
* @irq_suspend: function called from core code on suspend once per chip
* @irq_resume: function called from core code on resume once
per chip
* @irq_pm_shutdown: function called from core code on shutdown once per chip
+ * @irq_calc_mask: Optional function to set irq_data.mask for special cases
* @irq_print_chip: optional to print special chip info in show_interrupts
* @flags: chip specific flags
*/
@@ -327,6 +328,8 @@ struct irq_chip {
void (*irq_resume)(struct irq_data *data);
void (*irq_pm_shutdown)(struct irq_data *data);
+ void (*irq_calc_mask)(struct irq_data *data);
+
void (*irq_print_chip)(struct irq_data *data, struct
seq_file *p);
unsigned long flags;
Index: linux-2.6/kernel/irq/generic-chip.c
===================================================================
--- linux-2.6.orig/kernel/irq/generic-chip.c
+++ linux-2.6/kernel/irq/generic-chip.c
@@ -240,6 +240,7 @@ void irq_setup_generic_chip(struct irq_c
unsigned int set)
{
struct irq_chip_type *ct = gc->chip_types;
+ struct irq_chip *chip = &ct->chip;
unsigned int i;
u32 *mskptr = &gc->mask_cache, mskreg = ct->regs.mask;
@@ -267,9 +268,12 @@ void irq_setup_generic_chip(struct irq_c
if (!(flags & IRQ_GC_NO_MASK)) {
struct irq_data *d = irq_get_irq_data(i);
- d->mask = 1 << (i - gc->irq_base);
+ if (chip->irq_calc_mask)
+ chip->irq_calc_mask(d);
+ else
+ d->mask = 1 << (i - gc->irq_base);
}
- irq_set_chip_and_handler(i, &ct->chip, ct->handler);
+ irq_set_chip_and_handler(i, chip, ct->handler);
irq_set_chip_data(i, gc);
irq_modify_status(i, clr, set);
}
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