linux/include/linux/of_irq.h
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   1#ifndef __OF_IRQ_H
   2#define __OF_IRQ_H
   3
   4#if defined(CONFIG_OF)
   5struct of_irq;
   6#include <linux/types.h>
   7#include <linux/errno.h>
   8#include <linux/irq.h>
   9#include <linux/irqdomain.h>
  10#include <linux/ioport.h>
  11#include <linux/of.h>
  12
  13/*
  14 * irq_of_parse_and_map() is used by all OF enabled platforms; but SPARC
  15 * implements it differently.  However, the prototype is the same for all,
  16 * so declare it here regardless of the CONFIG_OF_IRQ setting.
  17 */
  18extern unsigned int irq_of_parse_and_map(struct device_node *node, int index);
  19
  20#if defined(CONFIG_OF_IRQ)
  21/**
  22 * of_irq - container for device_node/irq_specifier pair for an irq controller
  23 * @controller: pointer to interrupt controller device tree node
  24 * @size: size of interrupt specifier
  25 * @specifier: array of cells @size long specifing the specific interrupt
  26 *
  27 * This structure is returned when an interrupt is mapped. The controller
  28 * field needs to be put() after use
  29 */
  30#define OF_MAX_IRQ_SPEC         4 /* We handle specifiers of at most 4 cells */
  31struct of_irq {
  32        struct device_node *controller; /* Interrupt controller node */
  33        u32 size; /* Specifier size */
  34        u32 specifier[OF_MAX_IRQ_SPEC]; /* Specifier copy */
  35};
  36
  37typedef int (*of_irq_init_cb_t)(struct device_node *, struct device_node *);
  38
  39/*
  40 * Workarounds only applied to 32bit powermac machines
  41 */
  42#define OF_IMAP_OLDWORLD_MAC    0x00000001
  43#define OF_IMAP_NO_PHANDLE      0x00000002
  44
  45#if defined(CONFIG_PPC32) && defined(CONFIG_PPC_PMAC)
  46extern unsigned int of_irq_workarounds;
  47extern struct device_node *of_irq_dflt_pic;
  48extern int of_irq_map_oldworld(struct device_node *device, int index,
  49                               struct of_irq *out_irq);
  50#else /* CONFIG_PPC32 && CONFIG_PPC_PMAC */
  51#define of_irq_workarounds (0)
  52#define of_irq_dflt_pic (NULL)
  53static inline int of_irq_map_oldworld(struct device_node *device, int index,
  54                                      struct of_irq *out_irq)
  55{
  56        return -EINVAL;
  57}
  58#endif /* CONFIG_PPC32 && CONFIG_PPC_PMAC */
  59
  60
  61extern int of_irq_map_raw(struct device_node *parent, const __be32 *intspec,
  62                          u32 ointsize, const __be32 *addr,
  63                          struct of_irq *out_irq);
  64extern int of_irq_map_one(struct device_node *device, int index,
  65                          struct of_irq *out_irq);
  66extern unsigned int irq_create_of_mapping(struct device_node *controller,
  67                                          const u32 *intspec,
  68                                          unsigned int intsize);
  69extern int of_irq_to_resource(struct device_node *dev, int index,
  70                              struct resource *r);
  71extern int of_irq_count(struct device_node *dev);
  72extern int of_irq_to_resource_table(struct device_node *dev,
  73                struct resource *res, int nr_irqs);
  74extern struct device_node *of_irq_find_parent(struct device_node *child);
  75
  76extern void of_irq_init(const struct of_device_id *matches);
  77
  78#endif /* CONFIG_OF_IRQ */
  79
  80#else /* !CONFIG_OF */
  81static inline unsigned int irq_of_parse_and_map(struct device_node *dev,
  82                                                int index)
  83{
  84        return 0;
  85}
  86
  87static inline void *of_irq_find_parent(struct device_node *child)
  88{
  89        return NULL;
  90}
  91#endif /* !CONFIG_OF */
  92
  93#endif /* __OF_IRQ_H */
  94
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