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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@gmail.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Acked-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lkml.kernel.org/r/1415342669-30640-4-git-send-email-cernekee@gmail.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
This commit is contained in:
Kevin Cernekee 2014-11-06 22:44:18 -08:00 committed by Jason Cooper
parent 332fd7c4fe
commit 2b28037632
1 changed files with 12 additions and 2 deletions
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14
include/linux/irq.h
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@ -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 */