linux-kernel - [PATCH V4 03/14] genirq: Generic chip: Allow irqchip drivers to override irq_reg

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Date:	Thu,  6 Nov 2014 22:44:18 -0800
From:	Kevin Cernekee <cernekee@...il.com>
To:	tglx@...utronix.de, jason@...edaemon.net, linux-sh@...r.kernel.org
Cc:	arnd@...db.de, f.fainelli@...il.com, ralf@...ux-mips.org,
	sergei.shtylyov@...entembedded.com, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, mbizon@...ebox.fr, jogo@...nwrt.org,
	linux-mips@...ux-mips.org
Subject: [PATCH V4 03/14] genirq: Generic chip: Allow irqchip drivers to override irq_reg_{readl,writel}

Currently, these I/O accessors always assume little endian 32-bit
registers (readl/writel).  On some systems the IRQ registers need to be
accessed in BE mode or using 16-bit loads/stores, so we will provide a
way to override the default behavior.

Signed-off-by: Kevin Cernekee <cernekee@...il.com>
---
 include/linux/irq.h | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index ed1135d..0fecd95 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -686,6 +686,8 @@ struct irq_chip_type {
  * struct irq_chip_generic - Generic irq chip data structure
  * @lock:		Lock to protect register and cache data access
  * @reg_base:		Register base address (virtual)
+ * @reg_readl:		Alternate I/O accessor (defaults to readl if NULL)
+ * @reg_writel:		Alternate I/O accessor (defaults to writel if NULL)
  * @irq_base:		Interrupt base nr for this chip
  * @irq_cnt:		Number of interrupts handled by this chip
  * @mask_cache:		Cached mask register shared between all chip types
@@ -710,6 +712,8 @@ struct irq_chip_type {
 struct irq_chip_generic {
 	raw_spinlock_t		lock;
 	void __iomem		*reg_base;
+	u32			(*reg_readl)(void __iomem *addr);
+	void			(*reg_writel)(u32 val, void __iomem *addr);
 	unsigned int		irq_base;
 	unsigned int		irq_cnt;
 	u32			mask_cache;
@@ -818,13 +822,19 @@ static inline void irq_gc_unlock(struct irq_chip_generic *gc) { }
 static inline void irq_reg_writel(struct irq_chip_generic *gc,
 				  u32 val, int reg_offset)
 {
-	writel(val, gc->reg_base + reg_offset);
+	if (gc->reg_writel)
+		gc->reg_writel(val, gc->reg_base + reg_offset);
+	else
+		writel(val, gc->reg_base + reg_offset);
 }
 
 static inline u32 irq_reg_readl(struct irq_chip_generic *gc,
 				int reg_offset)
 {
-	return readl(gc->reg_base + reg_offset);
+	if (gc->reg_readl)
+		return gc->reg_readl(gc->reg_base + reg_offset);
+	else
+		return readl(gc->reg_base + reg_offset);
 }
 
 #endif /* _LINUX_IRQ_H */
-- 
2.1.1

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