Commit 1558368e authored by Jamie Iles's avatar Jamie Iles Committed by Marc Zyngier
Browse files

ARM: vic: MULTI_IRQ_HANDLER handler 



Add a handler for the VIC that is suitable for MULTI_IRQ_HANDLER
platforms.  This can replace the ASM entry macros for platforms that use
the VIC.

v4:	- rebase ontop of move __exception and friends to
	  asm/exception.h
	- rework polling loop to handle as many irqs as possible in one go
v3:	- simplify irq handling loop as suggested by Grant
	- service interrupts from msb->lsb order
v2:	- allow the handler be used for !CONFIG_OF
	- use irq_domain_to_irq()

Cc: Rob Herring <robherring2@gmail.com>
Acked-by: default avatarGrant Likely <grant.likely@secretlab.ca>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Tested-by: default avatarThomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: default avatarJamie Iles <jamie@jamieiles.com>
parent f9b28ccb

arch/arm/common/vic.c

+38 −0
Original line number Diff line number Diff line
@@ -31,6 +31,7 @@ 
#include <linux/device.h>

#include <linux/amba/bus.h>



#include <asm/exception.h>

#include <asm/mach/irq.h>

#include <asm/hardware/vic.h>
@@ -428,3 +429,40 @@ int __init vic_of_init(struct device_node *node, struct device_node *parent) 
	return -EIO;

}

#endif /* CONFIG OF */



#ifdef CONFIG_MULTI_IRQ_HANDLER

/*

 * Handle each interrupt in a single VIC.  Returns non-zero if we've

 * handled at least one interrupt.  This does a single read of the

 * status register and handles all interrupts in order from LSB first.

 */

static int handle_one_vic(struct vic_device *vic, struct pt_regs *regs)

{

	u32 stat, irq;

	int handled = 0;



	stat = readl_relaxed(vic->base + VIC_IRQ_STATUS);

	while (stat) {

		irq = ffs(stat) - 1;

		handle_IRQ(irq_domain_to_irq(&vic->domain, irq), regs);

		stat &= ~(1 << irq);

		handled = 1;

	}



	return handled;

}



/*

 * Keep iterating over all registered VIC's until there are no pending

 * interrupts.

 */

asmlinkage void __exception_irq_entry vic_handle_irq(struct pt_regs *regs)

{

	int i, handled;



	do {

		for (i = 0, handled = 0; i < vic_id; ++i)

			handled |= handle_one_vic(&vic_devices[i], regs);

	} while (handled);

}

#endif /* CONFIG_MULTI_IRQ_HANDLER */

arch/arm/include/asm/hardware/vic.h

+3 −0
Original line number Diff line number Diff line
@@ -45,8 +45,11 @@ 
#include <linux/types.h>



struct device_node;

struct pt_regs;



void vic_init(void __iomem *base, unsigned int irq_start, u32 vic_sources, u32 resume_sources);

int vic_of_init(struct device_node *node, struct device_node *parent);

void vic_handle_irq(struct pt_regs *regs);



#endif /* __ASSEMBLY__ */

#endif

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