1 #include <linux/irq.h> 2 #include <linux/irqdomain.h> 3 #include <linux/module.h> 4 #include <linux/mutex.h> 5 #include <linux/of.h> 6 #include <linux/of_address.h> 7 #include <linux/slab.h> 8 9 static LIST_HEAD(irq_domain_list); 10 static DEFINE_MUTEX(irq_domain_mutex); 11 12 /** 13 * irq_domain_add() - Register an irq_domain 14 * @domain: ptr to initialized irq_domain structure 15 * 16 * Registers an irq_domain structure. The irq_domain must at a minimum be 17 * initialized with an ops structure pointer, and either a ->to_irq hook or 18 * a valid irq_base value. Everything else is optional. 19 */ 20 void irq_domain_add(struct irq_domain *domain) 21 { 22 struct irq_data *d; 23 int hwirq, irq; 24 25 /* 26 * This assumes that the irq_domain owner has already allocated 27 * the irq_descs. This block will be removed when support for dynamic 28 * allocation of irq_descs is added to irq_domain. 29 */ 30 irq_domain_for_each_irq(domain, hwirq, irq) { 31 d = irq_get_irq_data(irq); 32 if (!d) { 33 WARN(1, "error: assigning domain to non existant irq_desc"); 34 return; 35 } 36 if (d->domain) { 37 /* things are broken; just report, don't clean up */ 38 WARN(1, "error: irq_desc already assigned to a domain"); 39 return; 40 } 41 d->domain = domain; 42 d->hwirq = hwirq; 43 } 44 45 mutex_lock(&irq_domain_mutex); 46 list_add(&domain->list, &irq_domain_list); 47 mutex_unlock(&irq_domain_mutex); 48 } 49 50 /** 51 * irq_domain_del() - Unregister an irq_domain 52 * @domain: ptr to registered irq_domain. 53 */ 54 void irq_domain_del(struct irq_domain *domain) 55 { 56 struct irq_data *d; 57 int hwirq, irq; 58 59 mutex_lock(&irq_domain_mutex); 60 list_del(&domain->list); 61 mutex_unlock(&irq_domain_mutex); 62 63 /* Clear the irq_domain assignments */ 64 irq_domain_for_each_irq(domain, hwirq, irq) { 65 d = irq_get_irq_data(irq); 66 d->domain = NULL; 67 } 68 } 69 70 #if defined(CONFIG_OF_IRQ) 71 /** 72 * irq_create_of_mapping() - Map a linux irq number from a DT interrupt spec 73 * 74 * Used by the device tree interrupt mapping code to translate a device tree 75 * interrupt specifier to a valid linux irq number. Returns either a valid 76 * linux IRQ number or 0. 77 * 78 * When the caller no longer need the irq number returned by this function it 79 * should arrange to call irq_dispose_mapping(). 80 */ 81 unsigned int irq_create_of_mapping(struct device_node *controller, 82 const u32 *intspec, unsigned int intsize) 83 { 84 struct irq_domain *domain; 85 unsigned long hwirq; 86 unsigned int irq, type; 87 int rc = -EINVAL; 88 89 /* Find a domain which can translate the irq spec */ 90 mutex_lock(&irq_domain_mutex); 91 list_for_each_entry(domain, &irq_domain_list, list) { 92 if (!domain->ops->dt_translate) 93 continue; 94 rc = domain->ops->dt_translate(domain, controller, 95 intspec, intsize, &hwirq, &type); 96 if (rc == 0) 97 break; 98 } 99 mutex_unlock(&irq_domain_mutex); 100 101 if (rc != 0) 102 return 0; 103 104 irq = irq_domain_to_irq(domain, hwirq); 105 if (type != IRQ_TYPE_NONE) 106 irq_set_irq_type(irq, type); 107 pr_debug("%s: mapped hwirq=%i to irq=%i, flags=%x\n", 108 controller->full_name, (int)hwirq, irq, type); 109 return irq; 110 } 111 EXPORT_SYMBOL_GPL(irq_create_of_mapping); 112 113 /** 114 * irq_dispose_mapping() - Discard a mapping created by irq_create_of_mapping() 115 * @irq: linux irq number to be discarded 116 * 117 * Calling this function indicates the caller no longer needs a reference to 118 * the linux irq number returned by a prior call to irq_create_of_mapping(). 119 */ 120 void irq_dispose_mapping(unsigned int irq) 121 { 122 /* 123 * nothing yet; will be filled when support for dynamic allocation of 124 * irq_descs is added to irq_domain 125 */ 126 } 127 EXPORT_SYMBOL_GPL(irq_dispose_mapping); 128 129 int irq_domain_simple_dt_translate(struct irq_domain *d, 130 struct device_node *controller, 131 const u32 *intspec, unsigned int intsize, 132 unsigned long *out_hwirq, unsigned int *out_type) 133 { 134 if (d->of_node != controller) 135 return -EINVAL; 136 if (intsize < 1) 137 return -EINVAL; 138 139 *out_hwirq = intspec[0]; 140 *out_type = IRQ_TYPE_NONE; 141 if (intsize > 1) 142 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; 143 return 0; 144 } 145 146 struct irq_domain_ops irq_domain_simple_ops = { 147 .dt_translate = irq_domain_simple_dt_translate, 148 }; 149 EXPORT_SYMBOL_GPL(irq_domain_simple_ops); 150 151 /** 152 * irq_domain_create_simple() - Set up a 'simple' translation range 153 */ 154 void irq_domain_add_simple(struct device_node *controller, int irq_base) 155 { 156 struct irq_domain *domain; 157 158 domain = kzalloc(sizeof(*domain), GFP_KERNEL); 159 if (!domain) { 160 WARN_ON(1); 161 return; 162 } 163 164 domain->irq_base = irq_base; 165 domain->of_node = of_node_get(controller); 166 domain->ops = &irq_domain_simple_ops; 167 irq_domain_add(domain); 168 } 169 EXPORT_SYMBOL_GPL(irq_domain_add_simple); 170 171 void irq_domain_generate_simple(const struct of_device_id *match, 172 u64 phys_base, unsigned int irq_start) 173 { 174 struct device_node *node; 175 pr_info("looking for phys_base=%llx, irq_start=%i\n", 176 (unsigned long long) phys_base, (int) irq_start); 177 node = of_find_matching_node_by_address(NULL, match, phys_base); 178 if (node) 179 irq_domain_add_simple(node, irq_start); 180 else 181 pr_info("no node found\n"); 182 } 183 EXPORT_SYMBOL_GPL(irq_domain_generate_simple); 184 #endif /* CONFIG_OF_IRQ */ 185