Commit 2b280376 authored by Kevin Cernekee's avatar Kevin Cernekee Committed by Jason Cooper
Browse files

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: default avatarKevin Cernekee <cernekee@gmail.com>
Acked-by: default avatarThomas Gleixner <tglx@linutronix.de>
Acked-by: default avatarAcked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lkml.kernel.org/r/1415342669-30640-4-git-send-email-cernekee@gmail.com


Signed-off-by: default avatarJason Cooper <jason@lakedaemon.net>
parent 332fd7c4

include/linux/irq.h

+12 −2
Original line number Diff line number Diff line
@@ -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;
@@ -818,12 +822,18 @@ 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)

{

	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)

{

	if (gc->reg_readl)

		return gc->reg_readl(gc->reg_base + reg_offset);

	else

		return readl(gc->reg_base + reg_offset);

}

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