From 7e71330169d8056536b299290544980bccc6b300 Mon Sep 17 00:00:00 2001 From: Grant Likely Date: Tue, 26 Jul 2011 03:19:06 -0600 Subject: dt/irq: add irq_domain_generate_simple() helper irq_domain_generate_simple() is an easy way to generate an irq translation domain for simple irq controllers. It assumes a flat 1:1 mapping from hardware irq number to an offset of the first linux irq number assigned to the controller Signed-off-by: Grant Likely --- kernel/irq/irqdomain.c | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) (limited to 'kernel') diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 29c7bd42e25..d5828da3fd3 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -3,6 +3,8 @@ #include #include #include +#include +#include static LIST_HEAD(irq_domain_list); static DEFINE_MUTEX(irq_domain_mutex); @@ -119,4 +121,60 @@ void irq_dispose_mapping(unsigned int irq) */ } EXPORT_SYMBOL_GPL(irq_dispose_mapping); + +int irq_domain_simple_dt_translate(struct irq_domain *d, + struct device_node *controller, + const u32 *intspec, unsigned int intsize, + unsigned long *out_hwirq, unsigned int *out_type) +{ + if (d->of_node != controller) + return -EINVAL; + if (intsize < 1) + return -EINVAL; + + *out_hwirq = intspec[0]; + *out_type = IRQ_TYPE_NONE; + if (intsize > 1) + *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; + return 0; +} + +struct irq_domain_ops irq_domain_simple_ops = { + .dt_translate = irq_domain_simple_dt_translate, +}; +EXPORT_SYMBOL_GPL(irq_domain_simple_ops); + +/** + * irq_domain_create_simple() - Set up a 'simple' translation range + */ +void irq_domain_add_simple(struct device_node *controller, int irq_base) +{ + struct irq_domain *domain; + + domain = kzalloc(sizeof(*domain), GFP_KERNEL); + if (!domain) { + WARN_ON(1); + return; + } + + domain->irq_base = irq_base; + domain->of_node = of_node_get(controller); + domain->ops = &irq_domain_simple_ops; + irq_domain_add(domain); +} +EXPORT_SYMBOL_GPL(irq_domain_add_simple); + +void irq_domain_generate_simple(const struct of_device_id *match, + u64 phys_base, unsigned int irq_start) +{ + struct device_node *node; + pr_info("looking for phys_base=%llx, irq_start=%i\n", + (unsigned long long) phys_base, (int) irq_start); + node = of_find_matching_node_by_address(NULL, match, phys_base); + if (node) + irq_domain_add_simple(node, irq_start); + else + pr_info("no node found\n"); +} +EXPORT_SYMBOL_GPL(irq_domain_generate_simple); #endif /* CONFIG_OF_IRQ */ -- cgit v1.2.3-70-g09d2