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metag: Internal and external irqchips

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Meta core internal interrupts (from HWSTATMETA and friends) are vectored
onto the TR1 core trigger for the current thread. This is demultiplexed
in irq-metag.c to individual Linux IRQs for each internal interrupt.

External SoC interrupts (from HWSTATEXT and friends) are vectored onto
the TR2 core trigger for the current thread. This is demultiplexed in
irq-metag-ext.c to individual Linux IRQs for each external SoC interrupt.
The external irqchip has devicetree bindings for configuring the number
of irq banks and the type of masking available.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Rob Landley <rob@landley.net>
Cc: Dom Cobley <popcornmix@gmail.com>
Cc: Simon Arlott <simon@fire.lp0.eu>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-doc@vger.kernel.org
This commit is contained in:
James Hogan 2012-10-09 10:54:47 +01:00
commit 5698c50d9d
8 changed files with 1359 additions and 0 deletions
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33
include/linux/irqchip/metag-ext.h Normal file
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/*
* Copyright (C) 2012 Imagination Technologies
*/
#ifndef _LINUX_IRQCHIP_METAG_EXT_H_
#define _LINUX_IRQCHIP_METAG_EXT_H_
struct irq_data;
struct platform_device;
/* called from core irq code at init */
int init_external_IRQ(void);
/*
* called from SoC init_irq() callback to dynamically indicate the lack of
* HWMASKEXT registers.
*/
void meta_intc_no_mask(void);
/*
* These allow SoCs to specialise the interrupt controller from their init_irq
* callbacks.
*/
extern struct irq_chip meta_intc_edge_chip;
extern struct irq_chip meta_intc_level_chip;
/* this should be called in the mask callback */
void meta_intc_mask_irq_simple(struct irq_data *data);
/* this should be called in the unmask callback */
void meta_intc_unmask_irq_simple(struct irq_data *data);
#endif /* _LINUX_IRQCHIP_METAG_EXT_H_ */

24
include/linux/irqchip/metag.h Normal file
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/*
* Copyright (C) 2011 Imagination Technologies
*/
#ifndef _LINUX_IRQCHIP_METAG_H_
#define _LINUX_IRQCHIP_METAG_H_
#include <linux/errno.h>
#ifdef CONFIG_METAG_PERFCOUNTER_IRQS
extern int init_internal_IRQ(void);
extern int internal_irq_map(unsigned int hw);
#else
static inline int init_internal_IRQ(void)
{
return 0;
}
static inline int internal_irq_map(unsigned int hw)
{
return -EINVAL;
}
#endif
#endif /* _LINUX_IRQCHIP_METAG_H_ */