xref: /openbmc/linux/include/linux/irqchip.h (revision 334f7d42)
1 /*
2  * Copyright (C) 2012 Thomas Petazzoni
3  *
4  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
5  *
6  * This file is licensed under the terms of the GNU General Public
7  * License version 2.  This program is licensed "as is" without any
8  * warranty of any kind, whether express or implied.
9  */
10 
11 #ifndef _LINUX_IRQCHIP_H
12 #define _LINUX_IRQCHIP_H
13 
14 #include <linux/acpi.h>
15 #include <linux/module.h>
16 #include <linux/of.h>
17 #include <linux/of_irq.h>
18 #include <linux/platform_device.h>
19 
20 /* Undefined on purpose */
21 extern of_irq_init_cb_t typecheck_irq_init_cb;
22 
23 #define typecheck_irq_init_cb(fn)					\
24 	(__typecheck(typecheck_irq_init_cb, &fn) ? fn : fn)
25 
26 /*
27  * This macro must be used by the different irqchip drivers to declare
28  * the association between their DT compatible string and their
29  * initialization function.
30  *
31  * @name: name that must be unique across all IRQCHIP_DECLARE of the
32  * same file.
33  * @compat: compatible string of the irqchip driver
34  * @fn: initialization function
35  */
36 #define IRQCHIP_DECLARE(name, compat, fn)	\
37 	OF_DECLARE_2(irqchip, name, compat, typecheck_irq_init_cb(fn))
38 
39 extern int platform_irqchip_probe(struct platform_device *pdev);
40 
41 #define IRQCHIP_PLATFORM_DRIVER_BEGIN(drv_name) \
42 static const struct of_device_id drv_name##_irqchip_match_table[] = {
43 
44 #define IRQCHIP_MATCH(compat, fn) { .compatible = compat,		\
45 				    .data = typecheck_irq_init_cb(fn), },
46 
47 
48 #define IRQCHIP_PLATFORM_DRIVER_END(drv_name, ...)			\
49 	{},								\
50 };									\
51 MODULE_DEVICE_TABLE(of, drv_name##_irqchip_match_table);		\
52 static struct platform_driver drv_name##_driver = {			\
53 	.probe  = IS_ENABLED(CONFIG_IRQCHIP) ? 				\
54 			platform_irqchip_probe : NULL,			\
55 	.driver = {							\
56 		.name = #drv_name,					\
57 		.owner = THIS_MODULE,					\
58 		.of_match_table = drv_name##_irqchip_match_table,	\
59 		.suppress_bind_attrs = true,				\
60 		__VA_ARGS__						\
61 	},								\
62 };									\
63 builtin_platform_driver(drv_name##_driver)
64 
65 /*
66  * This macro must be used by the different irqchip drivers to declare
67  * the association between their version and their initialization function.
68  *
69  * @name: name that must be unique across all IRQCHIP_ACPI_DECLARE of the
70  * same file.
71  * @subtable: Subtable to be identified in MADT
72  * @validate: Function to be called on that subtable to check its validity.
73  *            Can be NULL.
74  * @data: data to be checked by the validate function.
75  * @fn: initialization function
76  */
77 #define IRQCHIP_ACPI_DECLARE(name, subtable, validate, data, fn)	\
78 	ACPI_DECLARE_SUBTABLE_PROBE_ENTRY(irqchip, name,		\
79 					  ACPI_SIG_MADT, subtable,	\
80 					  validate, data, fn)
81 
82 #ifdef CONFIG_IRQCHIP
83 void irqchip_init(void);
84 #else
irqchip_init(void)85 static inline void irqchip_init(void) {}
86 #endif
87 
88 #endif
89