linux-kernel - [tip:irq/core] genirq: irqchip: Add a mask calculation function

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Date:	Wed, 29 May 2013 02:19:49 -0700
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	mingo@...nel.org, moinejf@...e.fr, jgunthorpe@...idianresearch.com,
	arnd@...db.de, thomas.petazzoni@...e-electrons.com,
	linux@....linux.org.uk, ezequiel.garcia@...e-electrons.com,
	tglx@...utronix.de, maxime.ripard@...e-electrons.com,
	rob@...dley.net, linux-kernel@...r.kernel.org, hpa@...or.com,
	jason@...edaemon.net, grant.likely@...aro.org,
	gerlando.falauto@...mile.com, sebastian.hesselbarth@...il.com,
	rob.herring@...xeda.com, gregory.clement@...e-electrons.com,
	andrew@...n.ch
Subject: [tip:irq/core] genirq: irqchip: Add a mask calculation function

Commit-ID:  d0051816e619f8f082582bec07ffa51bdb4f2104
Gitweb:     http://git.kernel.org/tip/d0051816e619f8f082582bec07ffa51bdb4f2104
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Mon, 6 May 2013 14:30:24 +0000
Committer:  Thomas Gleixner <tglx@...utronix.de>
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@...utronix.de>
Cc: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Russell King - ARM Linux <linux@....linux.org.uk>
Cc: Jason Cooper <jason@...edaemon.net>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Jean-Francois Moine <moinejf@...e.fr>
Cc: devicetree-discuss@...ts.ozlabs.org
Cc: Rob Herring <rob.herring@...xeda.com>
Cc: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc: Gregory Clement <gregory.clement@...e-electrons.com>
Cc: Gerlando Falauto <gerlando.falauto@...mile.com>
Cc: Rob Landley <rob@...dley.net>
Acked-by: Grant Likely <grant.likely@...aro.org>
Cc: Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc: Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Link: http://lkml.kernel.org/r/20130506142539.302898834@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 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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