irq_domain_add_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 <[email protected]> --- include/linux/irq.h | 11 +++++++++ kernel/irq/irqdomain.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++- 2 files changed, 68 insertions(+), 1 deletions(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index a103c01..50830fc 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -797,6 +797,17 @@ extern unsigned int irq_domain_map(struct irq_domain *domain, irq_hw_number_t hwirq); extern void irq_domain_unmap(struct irq_domain *domain, irq_hw_number_t hw); +struct of_device_id; +#ifdef CONFIG_OF +extern void irq_domain_add_simple(struct device_node *controller, int irq_base); +extern void irq_domain_generate_simple(struct of_device_id *match, + u64 phys_base, unsigned int irq_start); +#else +static inline void irq_domain_generate_simple(struct of_device_id *match, + u64 phys_base, unsigned int irq_start) { } +#endif + + #endif /* !CONFIG_S390 */ #endif /* _LINUX_IRQ_H */ diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 8310d6e..2d03c2d 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -1,7 +1,9 @@ - #include <linux/irq.h> #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); @@ -116,6 +118,8 @@ unsigned int irq_create_of_mapping(struct device_node *controller, irq = irq_domain_map(domain, hwirq); if (type != IRQ_TYPE_NONE) irq_set_irq_type(irq, type); + pr_debug("%s: mapped hwirq=%i to irq=%i, flags=%x\n", + controller->full_name, (int)hwirq, irq, type); return irq; } EXPORT_SYMBOL_GPL(irq_create_of_mapping); @@ -134,4 +138,56 @@ 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, + irq_hw_number_t *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; + return 0; +} + +struct irq_domain_ops irq_domain_simple_ops = { + .dt_translate = irq_domain_simple_dt_translate, +}; + +/** + * 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(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 _______________________________________________ devicetree-discuss mailing list [email protected] https://lists.ozlabs.org/listinfo/devicetree-discuss
