diff options
| author | Grant Likely | 2011-07-26 03:19:06 -0600 |
|---|---|---|
| committer | Grant Likely | 2011-07-28 01:32:04 -0600 |
| commit | 7e71330169d8056536b299290544980bccc6b300 (patch) | |
| tree | 7dab4954a7683e35bbf66adadd89b26971960311 /kernel/irq | |
| parent | 08a543ad33fc188650801bd36eed4ffe272643e1 (diff) | |
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 <grant.likely@secretlab.ca>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/irqdomain.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 29c7bd42e25d..d5828da3fd38 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -3,6 +3,8 @@ #include <linux/module.h> #include <linux/mutex.h> #include <linux/of.h> +#include <linux/of_address.h> +#include <linux/slab.h> 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 */ |