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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