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
49 #define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16
52 * struct irq_fwspec - generic IRQ specifier structure
54 * @fwnode: Pointer to a firmware-specific descriptor
55 * @param_count: Number of device-specific parameters
56 * @param: Device-specific parameters
58 * This structure, directly modeled after of_phandle_args, is used to
59 * pass a device-specific description of an interrupt.
62 struct fwnode_handle *fwnode;
64 u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
68 * Should several domains have the same device node, but serve
69 * different purposes (for example one domain is for PCI/MSI, and the
70 * other for wired IRQs), they can be distinguished using a
71 * bus-specific token. Most domains are expected to only carry
74 enum irq_domain_bus_token {
77 DOMAIN_BUS_PLATFORM_MSI,
82 * struct irq_domain_ops - Methods for irq_domain objects
83 * @match: Match an interrupt controller device node to a host, returns
85 * @map: Create or update a mapping between a virtual irq number and a hw
86 * irq number. This is called only once for a given mapping.
87 * @unmap: Dispose of such a mapping
88 * @xlate: Given a device tree node and interrupt specifier, decode
89 * the hardware irq number and linux irq type value.
91 * Functions below are provided by the driver and called whenever a new mapping
92 * is created or an old mapping is disposed. The driver can then proceed to
93 * whatever internal data structures management is required. It also needs
94 * to setup the irq_desc when returning from map().
96 struct irq_domain_ops {
97 int (*match)(struct irq_domain *d, struct device_node *node,
98 enum irq_domain_bus_token bus_token);
99 int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
100 void (*unmap)(struct irq_domain *d, unsigned int virq);
101 int (*xlate)(struct irq_domain *d, struct device_node *node,
102 const u32 *intspec, unsigned int intsize,
103 unsigned long *out_hwirq, unsigned int *out_type);
105 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
106 /* extended V2 interfaces to support hierarchy irq_domains */
107 int (*alloc)(struct irq_domain *d, unsigned int virq,
108 unsigned int nr_irqs, void *arg);
109 void (*free)(struct irq_domain *d, unsigned int virq,
110 unsigned int nr_irqs);
111 void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
112 void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
113 int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
114 unsigned long *out_hwirq, unsigned int *out_type);
118 extern struct irq_domain_ops irq_generic_chip_ops;
120 struct irq_domain_chip_generic;
123 * struct irq_domain - Hardware interrupt number translation object
124 * @link: Element in global irq_domain list.
125 * @name: Name of interrupt domain
126 * @ops: pointer to irq_domain methods
127 * @host_data: private data pointer for use by owner. Not touched by irq_domain
129 * @flags: host per irq_domain flags
132 * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
133 * when decoding device tree interrupt specifiers.
134 * @gc: Pointer to a list of generic chips. There is a helper function for
135 * setting up one or more generic chips for interrupt controllers
136 * drivers using the generic chip library which uses this pointer.
137 * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
139 * Revmap data, used internally by irq_domain
140 * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
141 * support direct mapping
142 * @revmap_size: Size of the linear map table @linear_revmap[]
143 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
144 * @linear_revmap: Linear table of hwirq->virq reverse mappings
147 struct list_head link;
149 const struct irq_domain_ops *ops;
154 struct fwnode_handle *fwnode;
155 enum irq_domain_bus_token bus_token;
156 struct irq_domain_chip_generic *gc;
157 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
158 struct irq_domain *parent;
161 /* reverse map data. The linear map gets appended to the irq_domain */
162 irq_hw_number_t hwirq_max;
163 unsigned int revmap_direct_max_irq;
164 unsigned int revmap_size;
165 struct radix_tree_root revmap_tree;
166 unsigned int linear_revmap[];
169 /* Irq domain flags */
171 /* Irq domain is hierarchical */
172 IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0),
174 /* Core calls alloc/free recursive through the domain hierarchy. */
175 IRQ_DOMAIN_FLAG_AUTO_RECURSIVE = (1 << 1),
178 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
179 * for implementation specific purposes and ignored by the
182 IRQ_DOMAIN_FLAG_NONCORE = (1 << 16),
185 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
187 return to_of_node(d->fwnode);
190 #ifdef CONFIG_IRQ_DOMAIN
191 struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
192 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
193 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
194 irq_hw_number_t hwirq_max, int direct_max,
195 const struct irq_domain_ops *ops,
197 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
199 unsigned int first_irq,
200 const struct irq_domain_ops *ops,
202 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
204 unsigned int first_irq,
205 irq_hw_number_t first_hwirq,
206 const struct irq_domain_ops *ops,
208 extern struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
209 enum irq_domain_bus_token bus_token);
210 extern void irq_set_default_host(struct irq_domain *host);
212 static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
214 return node ? &node->fwnode : NULL;
217 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
218 enum irq_domain_bus_token bus_token)
220 return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token);
223 static inline struct irq_domain *irq_find_host(struct device_node *node)
225 return irq_find_matching_host(node, DOMAIN_BUS_ANY);
229 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
230 * @of_node: pointer to interrupt controller's device tree node.
231 * @size: Number of interrupts in the domain.
232 * @ops: map/unmap domain callbacks
233 * @host_data: Controller private data pointer
235 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
237 const struct irq_domain_ops *ops,
240 return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
242 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
243 unsigned int max_irq,
244 const struct irq_domain_ops *ops,
247 return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data);
249 static inline struct irq_domain *irq_domain_add_legacy_isa(
250 struct device_node *of_node,
251 const struct irq_domain_ops *ops,
254 return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
257 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
258 const struct irq_domain_ops *ops,
261 return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data);
264 static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode,
266 const struct irq_domain_ops *ops,
269 return __irq_domain_add(fwnode, size, size, 0, ops, host_data);
272 static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
273 const struct irq_domain_ops *ops,
276 return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data);
279 extern void irq_domain_remove(struct irq_domain *host);
281 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
282 irq_hw_number_t hwirq);
283 extern void irq_domain_associate_many(struct irq_domain *domain,
284 unsigned int irq_base,
285 irq_hw_number_t hwirq_base, int count);
286 extern void irq_domain_disassociate(struct irq_domain *domain,
289 extern unsigned int irq_create_mapping(struct irq_domain *host,
290 irq_hw_number_t hwirq);
291 extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
292 extern void irq_dispose_mapping(unsigned int virq);
295 * irq_linear_revmap() - Find a linux irq from a hw irq number.
296 * @domain: domain owning this hardware interrupt
297 * @hwirq: hardware irq number in that domain space
299 * This is a fast path alternative to irq_find_mapping() that can be
300 * called directly by irq controller code to save a handful of
301 * instructions. It is always safe to call, but won't find irqs mapped
302 * using the radix tree.
304 static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
305 irq_hw_number_t hwirq)
307 return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
309 extern unsigned int irq_find_mapping(struct irq_domain *host,
310 irq_hw_number_t hwirq);
311 extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
312 extern int irq_create_strict_mappings(struct irq_domain *domain,
313 unsigned int irq_base,
314 irq_hw_number_t hwirq_base, int count);
316 static inline int irq_create_identity_mapping(struct irq_domain *host,
317 irq_hw_number_t hwirq)
319 return irq_create_strict_mappings(host, hwirq, hwirq, 1);
322 extern const struct irq_domain_ops irq_domain_simple_ops;
324 /* stock xlate functions */
325 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
326 const u32 *intspec, unsigned int intsize,
327 irq_hw_number_t *out_hwirq, unsigned int *out_type);
328 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
329 const u32 *intspec, unsigned int intsize,
330 irq_hw_number_t *out_hwirq, unsigned int *out_type);
331 int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
332 const u32 *intspec, unsigned int intsize,
333 irq_hw_number_t *out_hwirq, unsigned int *out_type);
335 /* V2 interfaces to support hierarchy IRQ domains. */
336 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
338 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
339 irq_hw_number_t hwirq, struct irq_chip *chip,
340 void *chip_data, irq_flow_handler_t handler,
341 void *handler_data, const char *handler_name);
342 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
343 extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
344 unsigned int flags, unsigned int size,
345 struct fwnode_handle *fwnode,
346 const struct irq_domain_ops *ops, void *host_data);
348 static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
351 struct device_node *node,
352 const struct irq_domain_ops *ops,
355 return irq_domain_create_hierarchy(parent, flags, size,
356 of_node_to_fwnode(node),
360 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
361 unsigned int nr_irqs, int node, void *arg,
363 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
364 extern void irq_domain_activate_irq(struct irq_data *irq_data);
365 extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
367 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
368 unsigned int nr_irqs, int node, void *arg)
370 return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false);
373 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
375 irq_hw_number_t hwirq,
376 struct irq_chip *chip,
378 extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
379 extern void irq_domain_free_irqs_common(struct irq_domain *domain,
381 unsigned int nr_irqs);
382 extern void irq_domain_free_irqs_top(struct irq_domain *domain,
383 unsigned int virq, unsigned int nr_irqs);
385 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
386 unsigned int irq_base,
387 unsigned int nr_irqs, void *arg);
389 extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
390 unsigned int irq_base,
391 unsigned int nr_irqs);
393 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
395 return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
397 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
398 static inline void irq_domain_activate_irq(struct irq_data *data) { }
399 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
400 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
401 unsigned int nr_irqs, int node, void *arg)
406 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
410 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
412 #else /* CONFIG_IRQ_DOMAIN */
413 static inline void irq_dispose_mapping(unsigned int virq) { }
414 static inline void irq_domain_activate_irq(struct irq_data *data) { }
415 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
416 #endif /* !CONFIG_IRQ_DOMAIN */
418 #endif /* _LINUX_IRQDOMAIN_H */