2 * irq_domain - IRQ translation domains
4 * Translation infrastructure between hw and linux irq numbers. This is
5 * helpful for interrupt controllers to implement mapping between hardware
6 * irq numbers and the Linux irq number space.
8 * irq_domains also have a hook for translating device tree interrupt
9 * representation into a hardware irq number that can be mapped back to a
10 * Linux irq number without any extra platform support code.
12 * Interrupt controller "domain" data structure. This could be defined as a
13 * irq domain controller. That is, it handles the mapping between hardware
14 * and virtual interrupt numbers for a given interrupt domain. The domain
15 * structure is generally created by the PIC code for a given PIC instance
16 * (though a domain can cover more than one PIC if they have a flat number
17 * model). It's the domain callbacks that are responsible for setting the
18 * irq_chip on a given irq_desc after it's been mapped.
20 * The host code and data structures are agnostic to whether or not
21 * we use an open firmware device-tree. We do have references to struct
22 * device_node in two places: in irq_find_host() to find the host matching
23 * a given interrupt controller node, and of course as an argument to its
24 * counterpart domain->ops->match() callback. However, those are treated as
25 * generic pointers by the core and the fact that it's actually a device-node
26 * pointer is purely a convention between callers and implementation. This
27 * code could thus be used on other architectures by replacing those two
28 * by some sort of arch-specific void * "token" used to identify interrupt
32 #ifndef _LINUX_IRQDOMAIN_H
33 #define _LINUX_IRQDOMAIN_H
35 #include <linux/types.h>
36 #include <linux/irqhandler.h>
38 #include <linux/radix-tree.h>
46 /* Number of irqs reserved for a legacy isa controller */
47 #define NUM_ISA_INTERRUPTS 16
50 * Should several domains have the same device node, but serve
51 * different purposes (for example one domain is for PCI/MSI, and the
52 * other for wired IRQs), they can be distinguished using a
53 * bus-specific token. Most domains are expected to only carry
56 enum irq_domain_bus_token {
59 DOMAIN_BUS_PLATFORM_MSI,
64 * struct irq_domain_ops - Methods for irq_domain objects
65 * @match: Match an interrupt controller device node to a host, returns
67 * @map: Create or update a mapping between a virtual irq number and a hw
68 * irq number. This is called only once for a given mapping.
69 * @unmap: Dispose of such a mapping
70 * @xlate: Given a device tree node and interrupt specifier, decode
71 * the hardware irq number and linux irq type value.
73 * Functions below are provided by the driver and called whenever a new mapping
74 * is created or an old mapping is disposed. The driver can then proceed to
75 * whatever internal data structures management is required. It also needs
76 * to setup the irq_desc when returning from map().
78 struct irq_domain_ops {
79 int (*match)(struct irq_domain *d, struct device_node *node,
80 enum irq_domain_bus_token bus_token);
81 int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
82 void (*unmap)(struct irq_domain *d, unsigned int virq);
83 int (*xlate)(struct irq_domain *d, struct device_node *node,
84 const u32 *intspec, unsigned int intsize,
85 unsigned long *out_hwirq, unsigned int *out_type);
87 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
88 /* extended V2 interfaces to support hierarchy irq_domains */
89 int (*alloc)(struct irq_domain *d, unsigned int virq,
90 unsigned int nr_irqs, void *arg);
91 void (*free)(struct irq_domain *d, unsigned int virq,
92 unsigned int nr_irqs);
93 void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
94 void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
98 extern struct irq_domain_ops irq_generic_chip_ops;
100 struct irq_domain_chip_generic;
103 * struct irq_domain - Hardware interrupt number translation object
104 * @link: Element in global irq_domain list.
105 * @name: Name of interrupt domain
106 * @ops: pointer to irq_domain methods
107 * @host_data: private data pointer for use by owner. Not touched by irq_domain
109 * @flags: host per irq_domain flags
112 * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
113 * when decoding device tree interrupt specifiers.
114 * @gc: Pointer to a list of generic chips. There is a helper function for
115 * setting up one or more generic chips for interrupt controllers
116 * drivers using the generic chip library which uses this pointer.
117 * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
119 * Revmap data, used internally by irq_domain
120 * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
121 * support direct mapping
122 * @revmap_size: Size of the linear map table @linear_revmap[]
123 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
124 * @linear_revmap: Linear table of hwirq->virq reverse mappings
127 struct list_head link;
129 const struct irq_domain_ops *ops;
134 struct fwnode_handle *fwnode;
135 enum irq_domain_bus_token bus_token;
136 struct irq_domain_chip_generic *gc;
137 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
138 struct irq_domain *parent;
141 /* reverse map data. The linear map gets appended to the irq_domain */
142 irq_hw_number_t hwirq_max;
143 unsigned int revmap_direct_max_irq;
144 unsigned int revmap_size;
145 struct radix_tree_root revmap_tree;
146 unsigned int linear_revmap[];
149 /* Irq domain flags */
151 /* Irq domain is hierarchical */
152 IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0),
154 /* Core calls alloc/free recursive through the domain hierarchy. */
155 IRQ_DOMAIN_FLAG_AUTO_RECURSIVE = (1 << 1),
158 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
159 * for implementation specific purposes and ignored by the
162 IRQ_DOMAIN_FLAG_NONCORE = (1 << 16),
165 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
167 return to_of_node(d->fwnode);
170 #ifdef CONFIG_IRQ_DOMAIN
171 struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
172 irq_hw_number_t hwirq_max, int direct_max,
173 const struct irq_domain_ops *ops,
175 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
177 unsigned int first_irq,
178 const struct irq_domain_ops *ops,
180 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
182 unsigned int first_irq,
183 irq_hw_number_t first_hwirq,
184 const struct irq_domain_ops *ops,
186 extern struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
187 enum irq_domain_bus_token bus_token);
188 extern void irq_set_default_host(struct irq_domain *host);
190 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
191 enum irq_domain_bus_token bus_token)
193 return irq_find_matching_fwnode(node ? &node->fwnode : NULL,
197 static inline struct irq_domain *irq_find_host(struct device_node *node)
199 return irq_find_matching_host(node, DOMAIN_BUS_ANY);
203 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
204 * @of_node: pointer to interrupt controller's device tree node.
205 * @size: Number of interrupts in the domain.
206 * @ops: map/unmap domain callbacks
207 * @host_data: Controller private data pointer
209 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
211 const struct irq_domain_ops *ops,
214 return __irq_domain_add(of_node, size, size, 0, ops, host_data);
216 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
217 unsigned int max_irq,
218 const struct irq_domain_ops *ops,
221 return __irq_domain_add(of_node, 0, max_irq, max_irq, ops, host_data);
223 static inline struct irq_domain *irq_domain_add_legacy_isa(
224 struct device_node *of_node,
225 const struct irq_domain_ops *ops,
228 return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
231 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
232 const struct irq_domain_ops *ops,
235 return __irq_domain_add(of_node, 0, ~0, 0, ops, host_data);
238 extern void irq_domain_remove(struct irq_domain *host);
240 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
241 irq_hw_number_t hwirq);
242 extern void irq_domain_associate_many(struct irq_domain *domain,
243 unsigned int irq_base,
244 irq_hw_number_t hwirq_base, int count);
245 extern void irq_domain_disassociate(struct irq_domain *domain,
248 extern unsigned int irq_create_mapping(struct irq_domain *host,
249 irq_hw_number_t hwirq);
250 extern void irq_dispose_mapping(unsigned int virq);
253 * irq_linear_revmap() - Find a linux irq from a hw irq number.
254 * @domain: domain owning this hardware interrupt
255 * @hwirq: hardware irq number in that domain space
257 * This is a fast path alternative to irq_find_mapping() that can be
258 * called directly by irq controller code to save a handful of
259 * instructions. It is always safe to call, but won't find irqs mapped
260 * using the radix tree.
262 static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
263 irq_hw_number_t hwirq)
265 return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
267 extern unsigned int irq_find_mapping(struct irq_domain *host,
268 irq_hw_number_t hwirq);
269 extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
270 extern int irq_create_strict_mappings(struct irq_domain *domain,
271 unsigned int irq_base,
272 irq_hw_number_t hwirq_base, int count);
274 static inline int irq_create_identity_mapping(struct irq_domain *host,
275 irq_hw_number_t hwirq)
277 return irq_create_strict_mappings(host, hwirq, hwirq, 1);
280 extern const struct irq_domain_ops irq_domain_simple_ops;
282 /* stock xlate functions */
283 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
284 const u32 *intspec, unsigned int intsize,
285 irq_hw_number_t *out_hwirq, unsigned int *out_type);
286 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
287 const u32 *intspec, unsigned int intsize,
288 irq_hw_number_t *out_hwirq, unsigned int *out_type);
289 int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
290 const u32 *intspec, unsigned int intsize,
291 irq_hw_number_t *out_hwirq, unsigned int *out_type);
293 /* V2 interfaces to support hierarchy IRQ domains. */
294 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
296 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
297 irq_hw_number_t hwirq, struct irq_chip *chip,
298 void *chip_data, irq_flow_handler_t handler,
299 void *handler_data, const char *handler_name);
300 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
301 extern struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
302 unsigned int flags, unsigned int size,
303 struct device_node *node,
304 const struct irq_domain_ops *ops, void *host_data);
305 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
306 unsigned int nr_irqs, int node, void *arg,
308 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
309 extern void irq_domain_activate_irq(struct irq_data *irq_data);
310 extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
312 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
313 unsigned int nr_irqs, int node, void *arg)
315 return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false);
318 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
320 irq_hw_number_t hwirq,
321 struct irq_chip *chip,
323 extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
324 extern void irq_domain_free_irqs_common(struct irq_domain *domain,
326 unsigned int nr_irqs);
327 extern void irq_domain_free_irqs_top(struct irq_domain *domain,
328 unsigned int virq, unsigned int nr_irqs);
330 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
331 unsigned int irq_base,
332 unsigned int nr_irqs, void *arg);
334 extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
335 unsigned int irq_base,
336 unsigned int nr_irqs);
338 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
340 return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
342 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
343 static inline void irq_domain_activate_irq(struct irq_data *data) { }
344 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
345 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
346 unsigned int nr_irqs, int node, void *arg)
351 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
355 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
357 #else /* CONFIG_IRQ_DOMAIN */
358 static inline void irq_dispose_mapping(unsigned int virq) { }
359 static inline void irq_domain_activate_irq(struct irq_data *data) { }
360 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
361 #endif /* !CONFIG_IRQ_DOMAIN */
363 #endif /* _LINUX_IRQDOMAIN_H */