summaryrefslogtreecommitdiffstats
path: root/include/linux/irqdomain.h
blob: f644fdb06dd691ba2d218384b1172791100f9aaf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
/*
 * irq_domain - IRQ translation domains
 *
 * Translation infrastructure between hw and linux irq numbers.  This is
 * helpful for interrupt controllers to implement mapping between hardware
 * irq numbers and the Linux irq number space.
 *
 * irq_domains also have a hook for translating device tree interrupt
 * representation into a hardware irq number that can be mapped back to a
 * Linux irq number without any extra platform support code.
 *
 * Interrupt controller "domain" data structure. This could be defined as a
 * irq domain controller. That is, it handles the mapping between hardware
 * and virtual interrupt numbers for a given interrupt domain. The domain
 * structure is generally created by the PIC code for a given PIC instance
 * (though a domain can cover more than one PIC if they have a flat number
 * model). It's the domain callbacks that are responsible for setting the
 * irq_chip on a given irq_desc after it's been mapped.
 *
 * The host code and data structures are agnostic to whether or not
 * we use an open firmware device-tree. We do have references to struct
 * device_node in two places: in irq_find_host() to find the host matching
 * a given interrupt controller node, and of course as an argument to its
 * counterpart domain->ops->match() callback. However, those are treated as
 * generic pointers by the core and the fact that it's actually a device-node
 * pointer is purely a convention between callers and implementation. This
 * code could thus be used on other architectures by replacing those two
 * by some sort of arch-specific void * "token" used to identify interrupt
 * controllers.
 */

#ifndef _LINUX_IRQDOMAIN_H
#define _LINUX_IRQDOMAIN_H

#include <linux/types.h>
#include <linux/irqhandler.h>
#include <linux/radix-tree.h>

struct device_node;
struct irq_domain;
struct of_device_id;
struct irq_chip;
struct irq_data;

/* Number of irqs reserved for a legacy isa controller */
#define NUM_ISA_INTERRUPTS	16

/*
 * Should several domains have the same device node, but serve
 * different purposes (for example one domain is for PCI/MSI, and the
 * other for wired IRQs), they can be distinguished using a
 * bus-specific token. Most domains are expected to only carry
 * DOMAIN_BUS_ANY.
 */
enum irq_domain_bus_token {
	DOMAIN_BUS_ANY		= 0,
	DOMAIN_BUS_PCI_MSI,
	DOMAIN_BUS_PLATFORM_MSI,
	DOMAIN_BUS_NEXUS,
};

/**
 * struct irq_domain_ops - Methods for irq_domain objects
 * @match: Match an interrupt controller device node to a host, returns
 *         1 on a match
 * @map: Create or update a mapping between a virtual irq number and a hw
 *       irq number. This is called only once for a given mapping.
 * @unmap: Dispose of such a mapping
 * @xlate: Given a device tree node and interrupt specifier, decode
 *         the hardware irq number and linux irq type value.
 *
 * Functions below are provided by the driver and called whenever a new mapping
 * is created or an old mapping is disposed. The driver can then proceed to
 * whatever internal data structures management is required. It also needs
 * to setup the irq_desc when returning from map().
 */
struct irq_domain_ops {
	int (*match)(struct irq_domain *d, struct device_node *node,
		     enum irq_domain_bus_token bus_token);
	int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
	void (*unmap)(struct irq_domain *d, unsigned int virq);
	int (*xlate)(struct irq_domain *d, struct device_node *node,
		     const u32 *intspec, unsigned int intsize,
		     unsigned long *out_hwirq, unsigned int *out_type);

#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
	/* extended V2 interfaces to support hierarchy irq_domains */
	int (*alloc)(struct irq_domain *d, unsigned int virq,
		     unsigned int nr_irqs, void *arg);
	void (*free)(struct irq_domain *d, unsigned int virq,
		     unsigned int nr_irqs);
	void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
	void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
#endif
};

extern struct irq_domain_ops irq_generic_chip_ops;

struct irq_domain_chip_generic;

/**
 * struct irq_domain - Hardware interrupt number translation object
 * @link: Element in global irq_domain list.
 * @name: Name of interrupt domain
 * @ops: pointer to irq_domain methods
 * @host_data: private data pointer for use by owner.  Not touched by irq_domain
 *             core code.
 * @flags: host per irq_domain flags
 *
 * Optional elements
 * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
 *           when decoding device tree interrupt specifiers.
 * @gc: Pointer to a list of generic chips. There is a helper function for
 *      setting up one or more generic chips for interrupt controllers
 *      drivers using the generic chip library which uses this pointer.
 * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
 *
 * Revmap data, used internally by irq_domain
 * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
 *                         support direct mapping
 * @revmap_size: Size of the linear map table @linear_revmap[]
 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
 * @linear_revmap: Linear table of hwirq->virq reverse mappings
 */
struct irq_domain {
	struct list_head link;
	const char *name;
	const struct irq_domain_ops *ops;
	void *host_data;
	unsigned int flags;

	/* Optional data */
	struct device_node *of_node;
	enum irq_domain_bus_token bus_token;
	struct irq_domain_chip_generic *gc;
#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
	struct irq_domain *parent;
#endif

	/* reverse map data. The linear map gets appended to the irq_domain */
	irq_hw_number_t hwirq_max;
	unsigned int revmap_direct_max_irq;
	unsigned int revmap_size;
	struct radix_tree_root revmap_tree;
	unsigned int linear_revmap[];
};

/* Irq domain flags */
enum {
	/* Irq domain is hierarchical */
	IRQ_DOMAIN_FLAG_HIERARCHY	= (1 << 0),

	/* Core calls alloc/free recursive through the domain hierarchy. */
	IRQ_DOMAIN_FLAG_AUTO_RECURSIVE	= (1 << 1),

	/*
	 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
	 * for implementation specific purposes and ignored by the
	 * core code.
	 */
	IRQ_DOMAIN_FLAG_NONCORE		= (1 << 16),
};

static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
{
	return d->of_node;
}

#ifdef CONFIG_IRQ_DOMAIN
struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
				    irq_hw_number_t hwirq_max, int direct_max,
				    const struct irq_domain_ops *ops,
				    void *host_data);
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
					 unsigned int size,
					 unsigned int first_irq,
					 const struct irq_domain_ops *ops,
					 void *host_data);
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
					 unsigned int size,
					 unsigned int first_irq,
					 irq_hw_number_t first_hwirq,
					 const struct irq_domain_ops *ops,
					 void *host_data);
extern struct irq_domain *irq_find_matching_host(struct device_node *node,
						 enum irq_domain_bus_token bus_token);
extern void irq_set_default_host(struct irq_domain *host);

static inline struct irq_domain *irq_find_host(struct device_node *node)
{
	return irq_find_matching_host(node, DOMAIN_BUS_ANY);
}

/**
 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
 * @of_node: pointer to interrupt controller's device tree node.
 * @size: Number of interrupts in the domain.
 * @ops: map/unmap domain callbacks
 * @host_data: Controller private data pointer
 */
static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
					 unsigned int size,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(of_node, size, size, 0, ops, host_data);
}
static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
					 unsigned int max_irq,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(of_node, 0, max_irq, max_irq, ops, host_data);
}
static inline struct irq_domain *irq_domain_add_legacy_isa(
				struct device_node *of_node,
				const struct irq_domain_ops *ops,
				void *host_data)
{
	return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
				     host_data);
}
static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(of_node, 0, ~0, 0, ops, host_data);
}

extern void irq_domain_remove(struct irq_domain *host);

extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
					irq_hw_number_t hwirq);
extern void irq_domain_associate_many(struct irq_domain *domain,
				      unsigned int irq_base,
				      irq_hw_number_t hwirq_base, int count);
extern void irq_domain_disassociate(struct irq_domain *domain,
				    unsigned int irq);

extern unsigned int irq_create_mapping(struct irq_domain *host,
				       irq_hw_number_t hwirq);
extern void irq_dispose_mapping(unsigned int virq);

/**
 * irq_linear_revmap() - Find a linux irq from a hw irq number.
 * @domain: domain owning this hardware interrupt
 * @hwirq: hardware irq number in that domain space
 *
 * This is a fast path alternative to irq_find_mapping() that can be
 * called directly by irq controller code to save a handful of
 * instructions. It is always safe to call, but won't find irqs mapped
 * using the radix tree.
 */
static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
					     irq_hw_number_t hwirq)
{
	return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
}
extern unsigned int irq_find_mapping(struct irq_domain *host,
				     irq_hw_number_t hwirq);
extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
extern int irq_create_strict_mappings(struct irq_domain *domain,
				      unsigned int irq_base,
				      irq_hw_number_t hwirq_base, int count);

static inline int irq_create_identity_mapping(struct irq_domain *host,
					      irq_hw_number_t hwirq)
{
	return irq_create_strict_mappings(host, hwirq, hwirq, 1);
}

extern const struct irq_domain_ops irq_domain_simple_ops;

/* stock xlate functions */
int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
			const u32 *intspec, unsigned int intsize,
			irq_hw_number_t *out_hwirq, unsigned int *out_type);
int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
			const u32 *intspec, unsigned int intsize,
			irq_hw_number_t *out_hwirq, unsigned int *out_type);
int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
			const u32 *intspec, unsigned int intsize,
			irq_hw_number_t *out_hwirq, unsigned int *out_type);

/* V2 interfaces to support hierarchy IRQ domains. */
extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
						unsigned int virq);
extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
				irq_hw_number_t hwirq, struct irq_chip *chip,
				void *chip_data, irq_flow_handler_t handler,
				void *handler_data, const char *handler_name);
#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
extern struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
			unsigned int flags, unsigned int size,
			struct device_node *node,
			const struct irq_domain_ops *ops, void *host_data);
extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
				   unsigned int nr_irqs, int node, void *arg,
				   bool realloc);
extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
extern void irq_domain_activate_irq(struct irq_data *irq_data);
extern void irq_domain_deactivate_irq(struct irq_data *irq_data);

static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
			unsigned int nr_irqs, int node, void *arg)
{
	return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false);
}

extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
					 unsigned int virq,
					 irq_hw_number_t hwirq,
					 struct irq_chip *chip,
					 void *chip_data);
extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
extern void irq_domain_free_irqs_common(struct irq_domain *domain,
					unsigned int virq,
					unsigned int nr_irqs);
extern void irq_domain_free_irqs_top(struct irq_domain *domain,
				     unsigned int virq, unsigned int nr_irqs);

extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
					unsigned int irq_base,
					unsigned int nr_irqs, void *arg);

extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
					unsigned int irq_base,
					unsigned int nr_irqs);

static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
{
	return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
}
#else	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
static inline void irq_domain_activate_irq(struct irq_data *data) { }
static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
			unsigned int nr_irqs, int node, void *arg)
{
	return -1;
}

static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
{
	return false;
}
#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */

#else /* CONFIG_IRQ_DOMAIN */
static inline void irq_dispose_mapping(unsigned int virq) { }
static inline void irq_domain_activate_irq(struct irq_data *data) { }
static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
#endif /* !CONFIG_IRQ_DOMAIN */

#endif /* _LINUX_IRQDOMAIN_H */