include/linux/of_irq.h

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