genirq: Generic chip: Add linear irq domain support
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>
diff --git a/include/linux/irq.h b/include/linux/irq.h
index ab8169f..af7052c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -678,6 +678,8 @@
* @wake_active: Interrupt is marked as an wakeup from suspend source
* @num_ct: Number of available irq_chip_type instances (usually 1)
* @private: Private data for non generic chip callbacks
+ * @installed: bitfield to denote installed interrupts
+ * @domain: irq domain pointer
* @list: List head for keeping track of instances
* @chip_types: Array of interrupt irq_chip_types
*
@@ -699,6 +701,8 @@
u32 wake_active;
unsigned int num_ct;
void *private;
+ unsigned long installed;
+ struct irq_domain *domain;
struct list_head list;
struct irq_chip_type chip_types[0];
};
@@ -719,6 +723,24 @@
IRQ_GC_NO_MASK = 1 << 3,
};
+/*
+ * struct irq_domain_chip_generic - Generic irq chip data structure for irq domains
+ * @irqs_per_chip: Number of interrupts per chip
+ * @num_chips: Number of chips
+ * @irq_flags_to_set: IRQ* flags to set on irq setup
+ * @irq_flags_to_clear: IRQ* flags to clear on irq setup
+ * @gc_flags: Generic chip specific setup flags
+ * @gc: Array of pointers to generic interrupt chips
+ */
+struct irq_domain_chip_generic {
+ unsigned int irqs_per_chip;
+ unsigned int num_chips;
+ unsigned int irq_flags_to_clear;
+ unsigned int irq_flags_to_set;
+ enum irq_gc_flags gc_flags;
+ struct irq_chip_generic *gc[0];
+};
+
/* Generic chip callback functions */
void irq_gc_noop(struct irq_data *d);
void irq_gc_mask_disable_reg(struct irq_data *d);
@@ -742,6 +764,14 @@
void irq_remove_generic_chip(struct irq_chip_generic *gc, u32 msk,
unsigned int clr, unsigned int set);
+struct irq_chip_generic *irq_get_domain_generic_chip(struct irq_domain *d, unsigned int hw_irq);
+int irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip,
+ int num_ct, const char *name,
+ irq_flow_handler_t handler,
+ unsigned int clr, unsigned int set,
+ enum irq_gc_flags flags);
+
+
static inline struct irq_chip_type *irq_data_get_chip_type(struct irq_data *d)
{
return container_of(d->chip, struct irq_chip_type, chip);
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 0d5b17b..ba2c708 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -66,6 +66,10 @@
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 @@
/* 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,