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genirq: Generic chip: Add linear irq domain support

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Provide infrastructure for irq chip implementations which work on
linear irq domains.

- Interface to allocate multiple generic chips which are associated to
  the irq domain.

- Interface to get the generic chip pointer for a particular hardware
  interrupt in the domain.

- irq domain mapping function to install the chip for a particular
  interrupt.

Note: This lacks a removal function for now.

[ Sebastian Hesselbarth: Mask cache and pointer math fixups ]

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Jean-Francois Moine <moinejf@free.fr>
Cc: devicetree-discuss@lists.ozlabs.org
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Cc: Gregory Clement <gregory.clement@free-electrons.com>
Cc: Gerlando Falauto <gerlando.falauto@keymile.com>
Cc: Rob Landley <rob@landley.net>
Acked-by: Grant Likely <grant.likely@linaro.org>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Link: http://lkml.kernel.org/r/20130506142539.450634298@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2013-05-06 14:30:27 +00:00
parent 3528d82b68
commit 088f40b7b0
4 changed files with 223 additions and 12 deletions
Download patch file Download diff file Expand all files Collapse all files

12
include/linux/irqdomain.h
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@ -66,6 +66,10 @@ struct irq_domain_ops {
unsigned long *out_hwirq, unsigned int *out_type);
};
extern struct irq_domain_ops irq_generic_chip_ops;
struct irq_domain_chip_generic;
/**
* struct irq_domain - Hardware interrupt number translation object
* @link: Element in global irq_domain list.
@ -109,8 +113,16 @@ struct irq_domain {
/* Optional device node pointer */
struct device_node *of_node;
/* Optional pointer to generic interrupt chips */
struct irq_domain_chip_generic *gc;
};
#define IRQ_DOMAIN_MAP_LEGACY 0 /* driver allocated fixed range of irqs.
* ie. legacy 8259, gets irqs 1..15 */
#define IRQ_DOMAIN_MAP_NOMAP 1 /* no fast reverse mapping */
#define IRQ_DOMAIN_MAP_LINEAR 2 /* linear map of interrupts */
#define IRQ_DOMAIN_MAP_TREE 3 /* radix tree */
#ifdef CONFIG_IRQ_DOMAIN
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
unsigned int size,