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authorPaul Burton <paul.burton@imgtec.com>2016-09-19 22:21:19 +0100
committerRalf Baechle <ralf@linux-mips.org>2016-10-06 17:31:00 +0200
commit19afc3d269fe66137ddb030b8ffdb8553066ba4a (patch)
tree3d56afec7e5421a75d0c02d2df25f729d8616a42 /arch
parent690803acca14e8aa101ca5204f0a23c24d7ad8c3 (diff)
irqchip: i8259: Allow platforms to override poll function
The default i8259 polling function (i8259_irq) is nicely generic but is fairly costly. Platforms often provide an alternative means of polling for an i8259 interrupt, and when using the i8259 without device tree have typically just chained its parent interrupt to their own handler function. In order to allow for platform-specific polling functions to be used in cases where the driver is probed via device tree, provide an i8259_set_poll function that accepts a pointer to an alternative poll function that will override the default. Signed-off-by: Paul Burton <paul.burton@imgtec.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/14270/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/mips/include/asm/i8259.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/mips/include/asm/i8259.h b/arch/mips/include/asm/i8259.h
index a7fbcd6ed13c..b27fcc4ae474 100644
--- a/arch/mips/include/asm/i8259.h
+++ b/arch/mips/include/asm/i8259.h
@@ -43,6 +43,17 @@ extern void make_8259A_irq(unsigned int irq);
extern void init_i8259_irqs(void);
extern int i8259_of_init(struct device_node *node, struct device_node *parent);
+/**
+ * i8159_set_poll() - Override the i8259 polling function
+ * @poll: pointer to platform-specific polling function
+ *
+ * Call this to override the generic i8259 polling function, which directly
+ * accesses i8259 registers, with a platform specific one which may be faster
+ * in cases where hardware provides a more optimal means of polling for an
+ * interrupt.
+ */
+extern void i8259_set_poll(int (*poll)(void));
+
/*
* Do the traditional i8259 interrupt polling thing. This is for the few
* cases where no better interrupt acknowledge method is available and we