diff options
| -rw-r--r-- | include/linux/irqdomain.h | 19 | ||||
| -rw-r--r-- | kernel/irq/irqdomain.c | 113 |
2 files changed, 107 insertions, 25 deletions
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h index 17b60be30fff..eab8a0e60b8e 100644 --- a/include/linux/irqdomain.h +++ b/include/linux/irqdomain.h @@ -149,12 +149,31 @@ static inline struct irq_domain *irq_domain_add_legacy_isa( extern void irq_domain_remove(struct irq_domain *host); +extern int irq_domain_associate_many(struct irq_domain *domain, + unsigned int irq_base, + irq_hw_number_t hwirq_base, int count); +static inline int irq_domain_associate(struct irq_domain *domain, unsigned int irq, + irq_hw_number_t hwirq) +{ + return irq_domain_associate_many(domain, irq, hwirq, 1); +} + extern unsigned int irq_create_mapping(struct irq_domain *host, irq_hw_number_t hwirq); extern void irq_dispose_mapping(unsigned int virq); extern unsigned int irq_find_mapping(struct irq_domain *host, irq_hw_number_t hwirq); extern unsigned int irq_create_direct_mapping(struct irq_domain *host); +extern int irq_create_strict_mappings(struct irq_domain *domain, + unsigned int irq_base, + irq_hw_number_t hwirq_base, int count); + +static inline int irq_create_identity_mapping(struct irq_domain *host, + irq_hw_number_t hwirq) +{ + return irq_create_strict_mappings(host, hwirq, hwirq, 1); +} + extern void irq_radix_revmap_insert(struct irq_domain *host, unsigned int virq, irq_hw_number_t hwirq); extern unsigned int irq_radix_revmap_lookup(struct irq_domain *host, diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c index 091732c9dbdc..a07d92446b66 100644 --- a/kernel/irq/irqdomain.c +++ b/kernel/irq/irqdomain.c @@ -410,36 +410,61 @@ static void irq_domain_disassociate_many(struct irq_domain *domain, } } -static int irq_setup_virq(struct irq_domain *domain, unsigned int virq, - irq_hw_number_t hwirq) +int irq_domain_associate_many(struct irq_domain *domain, unsigned int irq_base, + irq_hw_number_t hwirq_base, int count) { - struct irq_data *irq_data = irq_get_irq_data(virq); + unsigned int virq = irq_base; + irq_hw_number_t hwirq = hwirq_base; + int i; - irq_data->hwirq = hwirq; - irq_data->domain = domain; - if (domain->ops->map && domain->ops->map(domain, virq, hwirq)) { - pr_err("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq); - irq_data->domain = NULL; - irq_data->hwirq = 0; - return -1; - } + pr_debug("%s(%s, irqbase=%i, hwbase=%i, count=%i)\n", __func__, + of_node_full_name(domain->of_node), irq_base, (int)hwirq_base, count); - switch (domain->revmap_type) { - case IRQ_DOMAIN_MAP_LINEAR: - if (hwirq < domain->revmap_data.linear.size) - domain->revmap_data.linear.revmap[hwirq] = virq; - break; - case IRQ_DOMAIN_MAP_TREE: - mutex_lock(&revmap_trees_mutex); - irq_radix_revmap_insert(domain, virq, hwirq); - mutex_unlock(&revmap_trees_mutex); - break; - } + for (i = 0; i < count; i++) { + struct irq_data *irq_data = irq_get_irq_data(virq + i); + + if (WARN(!irq_data, "error: irq_desc not allocated; " + "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) + return -EINVAL; + if (WARN(irq_data->domain, "error: irq_desc already associated; " + "irq=%i hwirq=0x%x\n", virq + i, (int)hwirq + i)) + return -EINVAL; + }; + + for (i = 0; i < count; i++, virq++, hwirq++) { + struct irq_data *irq_data = irq_get_irq_data(virq); + + irq_data->hwirq = hwirq; + irq_data->domain = domain; + if (domain->ops->map && domain->ops->map(domain, virq, hwirq)) { + pr_err("irq-%i==>hwirq-0x%lx mapping failed\n", virq, hwirq); + irq_data->domain = NULL; + irq_data->hwirq = 0; + goto err_unmap; + } + + switch (domain->revmap_type) { + case IRQ_DOMAIN_MAP_LINEAR: + if (hwirq < domain->revmap_data.linear.size) + domain->revmap_data.linear.revmap[hwirq] = virq; + break; + case IRQ_DOMAIN_MAP_TREE: + mutex_lock(&revmap_trees_mutex); + irq_radix_revmap_insert(domain, virq, hwirq); + mutex_unlock(&revmap_trees_mutex); + break; + } - irq_clear_status_flags(virq, IRQ_NOREQUEST); + irq_clear_status_flags(virq, IRQ_NOREQUEST); + } return 0; + + err_unmap: + irq_domain_disassociate_many(domain, irq_base, i); + return -EINVAL; } +EXPORT_SYMBOL_GPL(irq_domain_associate_many); /** * irq_create_direct_mapping() - Allocate an irq for direct mapping @@ -472,7 +497,7 @@ unsigned int irq_create_direct_mapping(struct irq_domain *domain) } pr_debug("create_direct obtained virq %d\n", virq); - if (irq_setup_virq(domain, virq, virq)) { + if (irq_domain_associate(domain, virq, virq)) { irq_free_desc(virq); return 0; } @@ -533,7 +558,7 @@ unsigned int irq_create_mapping(struct irq_domain *domain, return 0; } - if (irq_setup_virq(domain, virq, hwirq)) { + if (irq_domain_associate(domain, virq, hwirq)) { irq_free_desc(virq); return 0; } @@ -545,6 +570,44 @@ unsigned int irq_create_mapping(struct irq_domain *domain, } EXPORT_SYMBOL_GPL(irq_create_mapping); +/** + * irq_create_strict_mappings() - Map a range of hw irqs to fixed linux irqs + * @domain: domain owning the interrupt range + * @irq_base: beginning of linux IRQ range + * @hwirq_base: beginning of hardware IRQ range + * @count: Number of interrupts to map + * + * This routine is used for allocating and mapping a range of hardware + * irqs to linux irqs where the linux irq numbers are at pre-defined + * locations. For use by controllers that already have static mappings + * to insert in to the domain. + * + * Non-linear users can use irq_create_identity_mapping() for IRQ-at-a-time + * domain insertion. + * + * 0 is returned upon success, while any failure to establish a static + * mapping is treated as an error. + */ +int irq_create_strict_mappings(struct irq_domain *domain, unsigned int irq_base, + irq_hw_number_t hwirq_base, int count) +{ + int ret; + + ret = irq_alloc_descs(irq_base, irq_base, count, + of_node_to_nid(domain->of_node)); + if (unlikely(ret < 0)) + return ret; + + ret = irq_domain_associate_many(domain, irq_base, hwirq_base, count); + if (unlikely(ret < 0)) { + irq_free_descs(irq_base, count); + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(irq_create_strict_mappings); + unsigned int irq_create_of_mapping(struct device_node *controller, const u32 *intspec, unsigned int intsize) { |