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 hooks for translating device tree or other
9 * firmware interrupt representations into a hardware irq number that
10 * can be mapped back to a Linux irq number without any extra platform
13 * Interrupt controller "domain" data structure. This could be defined as a
14 * irq domain controller. That is, it handles the mapping between hardware
15 * and virtual interrupt numbers for a given interrupt domain. The domain
16 * structure is generally created by the PIC code for a given PIC instance
17 * (though a domain can cover more than one PIC if they have a flat number
18 * model). It's the domain callbacks that are responsible for setting the
19 * irq_chip on a given irq_desc after it's been mapped.
21 * The host code and data structures use a fwnode_handle pointer to
22 * identify the domain. In some cases, and in order to preserve source
23 * code compatibility, this fwnode pointer is "upgraded" to a DT
24 * device_node. For those firmware infrastructures that do not provide
25 * a unique identifier for an interrupt controller, the irq_domain
26 * code offers a fwnode allocator.
29 #ifndef _LINUX_IRQDOMAIN_H
30 #define _LINUX_IRQDOMAIN_H
32 #include <linux/types.h>
33 #include <linux/irqhandler.h>
35 #include <linux/radix-tree.h>
43 /* Number of irqs reserved for a legacy isa controller */
44 #define NUM_ISA_INTERRUPTS 16
46 #define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16
49 * struct irq_fwspec - generic IRQ specifier structure
51 * @fwnode: Pointer to a firmware-specific descriptor
52 * @param_count: Number of device-specific parameters
53 * @param: Device-specific parameters
55 * This structure, directly modeled after of_phandle_args, is used to
56 * pass a device-specific description of an interrupt.
59 struct fwnode_handle *fwnode;
61 u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
65 * Should several domains have the same device node, but serve
66 * different purposes (for example one domain is for PCI/MSI, and the
67 * other for wired IRQs), they can be distinguished using a
68 * bus-specific token. Most domains are expected to only carry
71 enum irq_domain_bus_token {
74 DOMAIN_BUS_PLATFORM_MSI,
79 * struct irq_domain_ops - Methods for irq_domain objects
80 * @match: Match an interrupt controller device node to a host, returns
82 * @map: Create or update a mapping between a virtual irq number and a hw
83 * irq number. This is called only once for a given mapping.
84 * @unmap: Dispose of such a mapping
85 * @xlate: Given a device tree node and interrupt specifier, decode
86 * the hardware irq number and linux irq type value.
88 * Functions below are provided by the driver and called whenever a new mapping
89 * is created or an old mapping is disposed. The driver can then proceed to
90 * whatever internal data structures management is required. It also needs
91 * to setup the irq_desc when returning from map().
93 struct irq_domain_ops {
94 int (*match)(struct irq_domain *d, struct device_node *node,
95 enum irq_domain_bus_token bus_token);
96 int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
97 void (*unmap)(struct irq_domain *d, unsigned int virq);
98 int (*xlate)(struct irq_domain *d, struct device_node *node,
99 const u32 *intspec, unsigned int intsize,
100 unsigned long *out_hwirq, unsigned int *out_type);
102 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
103 /* extended V2 interfaces to support hierarchy irq_domains */
104 int (*alloc)(struct irq_domain *d, unsigned int virq,
105 unsigned int nr_irqs, void *arg);
106 void (*free)(struct irq_domain *d, unsigned int virq,
107 unsigned int nr_irqs);
108 void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
109 void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
110 int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
111 unsigned long *out_hwirq, unsigned int *out_type);
115 extern struct irq_domain_ops irq_generic_chip_ops;
117 struct irq_domain_chip_generic;
120 * struct irq_domain - Hardware interrupt number translation object
121 * @link: Element in global irq_domain list.
122 * @name: Name of interrupt domain
123 * @ops: pointer to irq_domain methods
124 * @host_data: private data pointer for use by owner. Not touched by irq_domain
126 * @flags: host per irq_domain flags
129 * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
130 * when decoding device tree interrupt specifiers.
131 * @gc: Pointer to a list of generic chips. There is a helper function for
132 * setting up one or more generic chips for interrupt controllers
133 * drivers using the generic chip library which uses this pointer.
134 * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
136 * Revmap data, used internally by irq_domain
137 * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
138 * support direct mapping
139 * @revmap_size: Size of the linear map table @linear_revmap[]
140 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
141 * @linear_revmap: Linear table of hwirq->virq reverse mappings
144 struct list_head link;
146 const struct irq_domain_ops *ops;
151 struct fwnode_handle *fwnode;
152 enum irq_domain_bus_token bus_token;
153 struct irq_domain_chip_generic *gc;
154 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
155 struct irq_domain *parent;
158 /* reverse map data. The linear map gets appended to the irq_domain */
159 irq_hw_number_t hwirq_max;
160 unsigned int revmap_direct_max_irq;
161 unsigned int revmap_size;
162 struct radix_tree_root revmap_tree;
163 unsigned int linear_revmap[];
166 /* Irq domain flags */
168 /* Irq domain is hierarchical */
169 IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0),
171 /* Core calls alloc/free recursive through the domain hierarchy. */
172 IRQ_DOMAIN_FLAG_AUTO_RECURSIVE = (1 << 1),
175 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
176 * for implementation specific purposes and ignored by the
179 IRQ_DOMAIN_FLAG_NONCORE = (1 << 16),
182 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
184 return to_of_node(d->fwnode);
187 #ifdef CONFIG_IRQ_DOMAIN
188 struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
189 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
190 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
191 irq_hw_number_t hwirq_max, int direct_max,
192 const struct irq_domain_ops *ops,
194 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
196 unsigned int first_irq,
197 const struct irq_domain_ops *ops,
199 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
201 unsigned int first_irq,
202 irq_hw_number_t first_hwirq,
203 const struct irq_domain_ops *ops,
205 extern struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
206 enum irq_domain_bus_token bus_token);
207 extern void irq_set_default_host(struct irq_domain *host);
209 static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
211 return node ? &node->fwnode : NULL;
214 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
215 enum irq_domain_bus_token bus_token)
217 return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token);
220 static inline struct irq_domain *irq_find_host(struct device_node *node)
222 return irq_find_matching_host(node, DOMAIN_BUS_ANY);
226 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
227 * @of_node: pointer to interrupt controller's device tree node.
228 * @size: Number of interrupts in the domain.
229 * @ops: map/unmap domain callbacks
230 * @host_data: Controller private data pointer
232 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
234 const struct irq_domain_ops *ops,
237 return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
239 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
240 unsigned int max_irq,
241 const struct irq_domain_ops *ops,
244 return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data);
246 static inline struct irq_domain *irq_domain_add_legacy_isa(
247 struct device_node *of_node,
248 const struct irq_domain_ops *ops,
251 return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
254 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
255 const struct irq_domain_ops *ops,
258 return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data);
261 static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode,
263 const struct irq_domain_ops *ops,
266 return __irq_domain_add(fwnode, size, size, 0, ops, host_data);
269 static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
270 const struct irq_domain_ops *ops,
273 return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data);
276 extern void irq_domain_remove(struct irq_domain *host);
278 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
279 irq_hw_number_t hwirq);
280 extern void irq_domain_associate_many(struct irq_domain *domain,
281 unsigned int irq_base,
282 irq_hw_number_t hwirq_base, int count);
283 extern void irq_domain_disassociate(struct irq_domain *domain,
286 extern unsigned int irq_create_mapping(struct irq_domain *host,
287 irq_hw_number_t hwirq);
288 extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
289 extern void irq_dispose_mapping(unsigned int virq);
292 * irq_linear_revmap() - Find a linux irq from a hw irq number.
293 * @domain: domain owning this hardware interrupt
294 * @hwirq: hardware irq number in that domain space
296 * This is a fast path alternative to irq_find_mapping() that can be
297 * called directly by irq controller code to save a handful of
298 * instructions. It is always safe to call, but won't find irqs mapped
299 * using the radix tree.
301 static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
302 irq_hw_number_t hwirq)
304 return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
306 extern unsigned int irq_find_mapping(struct irq_domain *host,
307 irq_hw_number_t hwirq);
308 extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
309 extern int irq_create_strict_mappings(struct irq_domain *domain,
310 unsigned int irq_base,
311 irq_hw_number_t hwirq_base, int count);
313 static inline int irq_create_identity_mapping(struct irq_domain *host,
314 irq_hw_number_t hwirq)
316 return irq_create_strict_mappings(host, hwirq, hwirq, 1);
319 extern const struct irq_domain_ops irq_domain_simple_ops;
321 /* stock xlate functions */
322 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
323 const u32 *intspec, unsigned int intsize,
324 irq_hw_number_t *out_hwirq, unsigned int *out_type);
325 int irq_domain_xlate_twocell(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_onetwocell(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);
332 /* V2 interfaces to support hierarchy IRQ domains. */
333 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
335 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
336 irq_hw_number_t hwirq, struct irq_chip *chip,
337 void *chip_data, irq_flow_handler_t handler,
338 void *handler_data, const char *handler_name);
339 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
340 extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
341 unsigned int flags, unsigned int size,
342 struct fwnode_handle *fwnode,
343 const struct irq_domain_ops *ops, void *host_data);
345 static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
348 struct device_node *node,
349 const struct irq_domain_ops *ops,
352 return irq_domain_create_hierarchy(parent, flags, size,
353 of_node_to_fwnode(node),
357 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
358 unsigned int nr_irqs, int node, void *arg,
360 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
361 extern void irq_domain_activate_irq(struct irq_data *irq_data);
362 extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
364 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
365 unsigned int nr_irqs, int node, void *arg)
367 return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false);
370 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
372 irq_hw_number_t hwirq,
373 struct irq_chip *chip,
375 extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
376 extern void irq_domain_free_irqs_common(struct irq_domain *domain,
378 unsigned int nr_irqs);
379 extern void irq_domain_free_irqs_top(struct irq_domain *domain,
380 unsigned int virq, unsigned int nr_irqs);
382 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
383 unsigned int irq_base,
384 unsigned int nr_irqs, void *arg);
386 extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
387 unsigned int irq_base,
388 unsigned int nr_irqs);
390 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
392 return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
394 #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
395 static inline void irq_domain_activate_irq(struct irq_data *data) { }
396 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
397 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
398 unsigned int nr_irqs, int node, void *arg)
403 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
407 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
409 #else /* CONFIG_IRQ_DOMAIN */
410 static inline void irq_dispose_mapping(unsigned int virq) { }
411 static inline void irq_domain_activate_irq(struct irq_data *data) { }
412 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
413 #endif /* !CONFIG_IRQ_DOMAIN */
415 #endif /* _LINUX_IRQDOMAIN_H */