lkml.org 
[lkml]   [2011]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Subject[PATCH v3 2/2] dt/irq: add irq_domain_generate_simple() helper
    From
    Date
    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>
    ---
    include/linux/irqdomain.h | 12 +++++++++
    kernel/irq/irqdomain.c | 59 ++++++++++++++++++++++++++++++++++++++++++++-
    2 files changed, 70 insertions(+), 1 deletions(-)

    diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
    index 8f2c10a..8e3ea36 100644
    --- a/include/linux/irqdomain.h
    +++ b/include/linux/irqdomain.h
    @@ -16,6 +16,7 @@
    #define _LINUX_IRQDOMAIN_H

    #include <linux/irq.h>
    +#include <linux/mod_devicetable.h>

    #ifdef CONFIG_IRQ_DOMAIN
    struct device_node;
    @@ -76,6 +77,17 @@ static inline unsigned int irq_domain_to_irq(struct irq_domain *d,

    extern void irq_domain_add(struct irq_domain *domain);
    extern void irq_domain_del(struct irq_domain *domain);
    +
    +#ifdef CONFIG_OF_IRQ
    +extern void irq_domain_add_simple(struct device_node *controller, int irq_base);
    +extern void irq_domain_generate_simple(const struct of_device_id *match,
    + u64 phys_base, unsigned int irq_start);
    +#else /* CONFIG_OF_IRQ */
    +static inline void irq_domain_generate_simple(const struct of_device_id *match,
    + u64 phys_base, unsigned int irq_start) { }
    +#endif /* CONFIG_OF_IRQ */
    +
    +
    #endif /* CONFIG_IRQ_DOMAIN */

    #endif /* _LINUX_IRQDOMAIN_H */
    diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
    index 171b754..d5828da 100644
    --- a/kernel/irq/irqdomain.c
    +++ b/kernel/irq/irqdomain.c
    @@ -1,9 +1,10 @@
    -
    #include <linux/irq.h>
    #include <linux/irqdomain.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);
    @@ -120,4 +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 */


    \
     
     \ /
      Last update: 2011-07-26 11:39    [W:0.024 / U:61.380 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site