Commit-ID: d0051816e619f8f082582bec07ffa51bdb4f2104
Gitweb: http://git.kernel.org/tip/d0051816e619f8f082582bec07ffa51bdb4f2104
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Mon, 6 May 2013 14:30:24 +0000
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Wed, 29 May 2013 10:57:10 +0200
genirq: irqchip: Add a mask calculation function
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 <tglx@xxxxxxxxxxxxx>
Cc: Thomas Petazzoni <thomas.petazzoni@xxxxxxxxxxxxxxxxxx>
Cc: Andrew Lunn <andrew@xxxxxxx>
Cc: Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx>
Cc: Jason Cooper <jason@xxxxxxxxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Jean-Francois Moine <moinejf@xxxxxxx>
Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
Cc: Gregory Clement <gregory.clement@xxxxxxxxxxxxxxxxxx>
Cc: Gerlando Falauto <gerlando.falauto@xxxxxxxxxxx>
Cc: Rob Landley <rob@xxxxxxxxxxx>
Acked-by: Grant Likely <grant.likely@xxxxxxxxxx>
Cc: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
Cc: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20130506142539.302898834@xxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
include/linux/irq.h | 3 +++
kernel/irq/generic-chip.c | 8 ++++++--
2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index d5fc7f5..ab8169f 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -296,6 +296,7 @@ static inline irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
* @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;
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c
index 957155c..5068fe3 100644
--- a/kernel/irq/generic-chip.c
+++ b/kernel/irq/generic-chip.c
@@ -240,6 +240,7 @@ void irq_setup_generic_chip(struct irq_chip_generic *gc, u32 msk,
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_chip_generic *gc, u32 msk,
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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