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 if (d->nr_irq && ((intspec[0] < d->hwirq_base) || 139 (intspec[0] >= d->hwirq_base + d->nr_irq))) 140 return -EINVAL; 141 142 *out_hwirq = intspec[0]; 143 *out_type = IRQ_TYPE_NONE; 144 if (intsize > 1) 145 *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK; 146 return 0; 147 } 148 149 /** 150 * irq_domain_create_simple() - Set up a 'simple' translation range 151 */ 152 void irq_domain_add_simple(struct device_node *controller, int irq_base) 153 { 154 struct irq_domain *domain; 155 156 domain = kzalloc(sizeof(*domain), GFP_KERNEL); 157 if (!domain) { 158 WARN_ON(1); 159 return; 160 } 161 162 domain->irq_base = irq_base; 163 domain->of_node = of_node_get(controller); 164 domain->ops = &irq_domain_simple_ops; 165 irq_domain_add(domain); 166 } 167 EXPORT_SYMBOL_GPL(irq_domain_add_simple); 168 169 void irq_domain_generate_simple(const struct of_device_id *match, 170 u64 phys_base, unsigned int irq_start) 171 { 172 struct device_node *node; 173 pr_info("looking for phys_base=%llx, irq_start=%i\n", 174 (unsigned long long) phys_base, (int) irq_start); 175 node = of_find_matching_node_by_address(NULL, match, phys_base); 176 if (node) 177 irq_domain_add_simple(node, irq_start); 178 else 179 pr_info("no node found\n"); 180 } 181 EXPORT_SYMBOL_GPL(irq_domain_generate_simple); 182 #endif /* CONFIG_OF_IRQ */ 183 184 struct irq_domain_ops irq_domain_simple_ops = { 185 #ifdef CONFIG_OF_IRQ 186 .dt_translate = irq_domain_simple_dt_translate, 187 #endif /* CONFIG_OF_IRQ */ 188 }; 189 EXPORT_SYMBOL_GPL(irq_domain_simple_ops); 190