From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Cernekee Subject: [PATCH V3 03/14] genirq: Generic chip: Allow irqchip drivers to override irq_reg_{readl,writel} Date: Sat, 1 Nov 2014 18:03:50 -0700 Message-ID: <1414890241-9938-4-git-send-email-cernekee@gmail.com> References: <1414890241-9938-1-git-send-email-cernekee@gmail.com> Return-path: In-Reply-To: <1414890241-9938-1-git-send-email-cernekee@gmail.com> Sender: linux-sh-owner@vger.kernel.org To: arnd@arndb.de, f.fainelli@gmail.com, tglx@linutronix.de, jason@lakedaemon.net, ralf@linux-mips.org Cc: linux-sh@vger.kernel.org, sergei.shtylyov@cogentembedded.com, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, mbizon@freebox.fr, jogo@openwrt.org, linux-mips@linux-mips.org List-Id: devicetree@vger.kernel.org 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 --- include/linux/irq.h | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index 0743743..a514ef7 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -20,6 +20,7 @@ #include #include #include +#include #include #include @@ -709,6 +710,8 @@ 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; @@ -817,13 +820,19 @@ 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