include/linux/irqdomain.h

   1 /*
   2  * irq_domain - IRQ translation domains
   3  *
   4  * Translation infrastructure between hw and linux irq numbers.  This is
   5  * helpful for interrupt controllers to implement mapping between hardware
   6  * irq numbers and the Linux irq number space.
   7  *
   8  * irq_domains also have a hook for translating device tree interrupt
   9  * representation into a hardware irq number that can be mapped back to a
  10  * Linux irq number without any extra platform support code.
  11  *
  12  * Interrupt controller "domain" data structure. This could be defined as a
  13  * irq domain controller. That is, it handles the mapping between hardware
  14  * and virtual interrupt numbers for a given interrupt domain. The domain
  15  * structure is generally created by the PIC code for a given PIC instance
  16  * (though a domain can cover more than one PIC if they have a flat number
  17  * model). It's the domain callbacks that are responsible for setting the
  18  * irq_chip on a given irq_desc after it's been mapped.
  19  *
  20  * The host code and data structures are agnostic to whether or not
  21  * we use an open firmware device-tree. We do have references to struct
  22  * device_node in two places: in irq_find_host() to find the host matching
  23  * a given interrupt controller node, and of course as an argument to its
  24  * counterpart domain->ops->match() callback. However, those are treated as
  25  * generic pointers by the core and the fact that it's actually a device-node
  26  * pointer is purely a convention between callers and implementation. This
  27  * code could thus be used on other architectures by replacing those two
  28  * by some sort of arch-specific void * "token" used to identify interrupt
  29  * controllers.
  30  */
  31
  32 #ifndef _LINUX_IRQDOMAIN_H
  33 #define _LINUX_IRQDOMAIN_H
  34
  35 #include <linux/types.h>
  36 #include <linux/irqhandler.h>
  37 #include <linux/radix-tree.h>
  38
  39 struct device_node;
  40 struct irq_domain;
  41 struct of_device_id;
  42 struct irq_chip;
  43 struct irq_data;
  44
  45 /* Number of irqs reserved for a legacy isa controller */
  46 #define NUM_ISA_INTERRUPTS      16
  47
  48 /*
  49  * Should several domains have the same device node, but serve
  50  * different purposes (for example one domain is for PCI/MSI, and the
  51  * other for wired IRQs), they can be distinguished using a
  52  * bus-specific token. Most domains are expected to only carry
  53  * DOMAIN_BUS_ANY.
  54  */
  55 enum irq_domain_bus_token {
  56         DOMAIN_BUS_ANY          = 0,
  57         DOMAIN_BUS_PCI_MSI,
  58         DOMAIN_BUS_PLATFORM_MSI,
  59         DOMAIN_BUS_NEXUS,
  60 };
  61
  62 /**
  63  * struct irq_domain_ops - Methods for irq_domain objects
  64  * @match: Match an interrupt controller device node to a host, returns
  65  *         1 on a match
  66  * @map: Create or update a mapping between a virtual irq number and a hw
  67  *       irq number. This is called only once for a given mapping.
  68  * @unmap: Dispose of such a mapping
  69  * @xlate: Given a device tree node and interrupt specifier, decode
  70  *         the hardware irq number and linux irq type value.
  71  *
  72  * Functions below are provided by the driver and called whenever a new mapping
  73  * is created or an old mapping is disposed. The driver can then proceed to
  74  * whatever internal data structures management is required. It also needs
  75  * to setup the irq_desc when returning from map().
  76  */
  77 struct irq_domain_ops {
  78         int (*match)(struct irq_domain *d, struct device_node *node,
  79                      enum irq_domain_bus_token bus_token);
  80         int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
  81         void (*unmap)(struct irq_domain *d, unsigned int virq);
  82         int (*xlate)(struct irq_domain *d, struct device_node *node,
  83                      const u32 *intspec, unsigned int intsize,
  84                      unsigned long *out_hwirq, unsigned int *out_type);
  85
  86 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
  87         /* extended V2 interfaces to support hierarchy irq_domains */
  88         int (*alloc)(struct irq_domain *d, unsigned int virq,
  89                      unsigned int nr_irqs, void *arg);
  90         void (*free)(struct irq_domain *d, unsigned int virq,
  91                      unsigned int nr_irqs);
  92         void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
  93         void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
  94 #endif
  95 };
  96
  97 extern struct irq_domain_ops irq_generic_chip_ops;
  98
  99 struct irq_domain_chip_generic;
 100
 101 /**
 102  * struct irq_domain - Hardware interrupt number translation object
 103  * @link: Element in global irq_domain list.
 104  * @name: Name of interrupt domain
 105  * @ops: pointer to irq_domain methods
 106  * @host_data: private data pointer for use by owner.  Not touched by irq_domain
 107  *             core code.
 108  * @flags: host per irq_domain flags
 109  *
 110  * Optional elements
 111  * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
 112  *           when decoding device tree interrupt specifiers.
 113  * @gc: Pointer to a list of generic chips. There is a helper function for
 114  *      setting up one or more generic chips for interrupt controllers
 115  *      drivers using the generic chip library which uses this pointer.
 116  * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
 117  *
 118  * Revmap data, used internally by irq_domain
 119  * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
 120  *                         support direct mapping
 121  * @revmap_size: Size of the linear map table @linear_revmap[]
 122  * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
 123  * @linear_revmap: Linear table of hwirq->virq reverse mappings
 124  */
 125 struct irq_domain {
 126         struct list_head link;
 127         const char *name;
 128         const struct irq_domain_ops *ops;
 129         void *host_data;
 130         unsigned int flags;
 131
 132         /* Optional data */
 133         struct device_node *of_node;
 134         enum irq_domain_bus_token bus_token;
 135         struct irq_domain_chip_generic *gc;
 136 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
 137         struct irq_domain *parent;
 138 #endif
 139
 140         /* reverse map data. The linear map gets appended to the irq_domain */
 141         irq_hw_number_t hwirq_max;
 142         unsigned int revmap_direct_max_irq;
 143         unsigned int revmap_size;
 144         struct radix_tree_root revmap_tree;
 145         unsigned int linear_revmap[];
 146 };
 147
 148 /* Irq domain flags */
 149 enum {
 150         /* Irq domain is hierarchical */
 151         IRQ_DOMAIN_FLAG_HIERARCHY       = (1 << 0),
 152
 153         /* Core calls alloc/free recursive through the domain hierarchy. */
 154         IRQ_DOMAIN_FLAG_AUTO_RECURSIVE  = (1 << 1),
 155
 156         /*
 157          * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
 158          * for implementation specific purposes and ignored by the
 159          * core code.
 160          */
 161         IRQ_DOMAIN_FLAG_NONCORE         = (1 << 16),
 162 };
 163
 164 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
 165 {
 166         return d->of_node;
 167 }
 168
 169 #ifdef CONFIG_IRQ_DOMAIN
 170 struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
 171                                     irq_hw_number_t hwirq_max, int direct_max,
 172                                     const struct irq_domain_ops *ops,
 173                                     void *host_data);
 174 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
 175                                          unsigned int size,
 176                                          unsigned int first_irq,
 177                                          const struct irq_domain_ops *ops,
 178                                          void *host_data);
 179 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 180                                          unsigned int size,
 181                                          unsigned int first_irq,
 182                                          irq_hw_number_t first_hwirq,
 183                                          const struct irq_domain_ops *ops,
 184                                          void *host_data);
 185 extern struct irq_domain *irq_find_matching_host(struct device_node *node,
 186                                                  enum irq_domain_bus_token bus_token);
 187 extern void irq_set_default_host(struct irq_domain *host);
 188
 189 static inline struct irq_domain *irq_find_host(struct device_node *node)
 190 {
 191         return irq_find_matching_host(node, DOMAIN_BUS_ANY);
 192 }
 193
 194 /**
 195  * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
 196  * @of_node: pointer to interrupt controller's device tree node.
 197  * @size: Number of interrupts in the domain.
 198  * @ops: map/unmap domain callbacks
 199  * @host_data: Controller private data pointer
 200  */
 201 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
 202                                          unsigned int size,
 203                                          const struct irq_domain_ops *ops,
 204                                          void *host_data)
 205 {
 206         return __irq_domain_add(of_node, size, size, 0, ops, host_data);
 207 }
 208 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 209                                          unsigned int max_irq,
 210                                          const struct irq_domain_ops *ops,
 211                                          void *host_data)
 212 {
 213         return __irq_domain_add(of_node, 0, max_irq, max_irq, ops, host_data);
 214 }
 215 static inline struct irq_domain *irq_domain_add_legacy_isa(
 216                                 struct device_node *of_node,
 217                                 const struct irq_domain_ops *ops,
 218                                 void *host_data)
 219 {
 220         return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
 221                                      host_data);
 222 }
 223 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
 224                                          const struct irq_domain_ops *ops,
 225                                          void *host_data)
 226 {
 227         return __irq_domain_add(of_node, 0, ~0, 0, ops, host_data);
 228 }
 229
 230 extern void irq_domain_remove(struct irq_domain *host);
 231
 232 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
 233                                         irq_hw_number_t hwirq);
 234 extern void irq_domain_associate_many(struct irq_domain *domain,
 235                                       unsigned int irq_base,
 236                                       irq_hw_number_t hwirq_base, int count);
 237 extern void irq_domain_disassociate(struct irq_domain *domain,
 238                                     unsigned int irq);
 239
 240 extern unsigned int irq_create_mapping(struct irq_domain *host,
 241                                        irq_hw_number_t hwirq);
 242 extern void irq_dispose_mapping(unsigned int virq);
 243
 244 /**
 245  * irq_linear_revmap() - Find a linux irq from a hw irq number.
 246  * @domain: domain owning this hardware interrupt
 247  * @hwirq: hardware irq number in that domain space
 248  *
 249  * This is a fast path alternative to irq_find_mapping() that can be
 250  * called directly by irq controller code to save a handful of
 251  * instructions. It is always safe to call, but won't find irqs mapped
 252  * using the radix tree.
 253  */
 254 static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
 255                                              irq_hw_number_t hwirq)
 256 {
 257         return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
 258 }
 259 extern unsigned int irq_find_mapping(struct irq_domain *host,
 260                                      irq_hw_number_t hwirq);
 261 extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
 262 extern int irq_create_strict_mappings(struct irq_domain *domain,
 263                                       unsigned int irq_base,
 264                                       irq_hw_number_t hwirq_base, int count);
 265
 266 static inline int irq_create_identity_mapping(struct irq_domain *host,
 267                                               irq_hw_number_t hwirq)
 268 {
 269         return irq_create_strict_mappings(host, hwirq, hwirq, 1);
 270 }
 271
 272 extern const struct irq_domain_ops irq_domain_simple_ops;
 273
 274 /* stock xlate functions */
 275 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 276                         const u32 *intspec, unsigned int intsize,
 277                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
 278 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
 279                         const u32 *intspec, unsigned int intsize,
 280                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
 281 int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
 282                         const u32 *intspec, unsigned int intsize,
 283                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
 284
 285 /* V2 interfaces to support hierarchy IRQ domains. */
 286 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
 287                                                 unsigned int virq);
 288 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
 289                                 irq_hw_number_t hwirq, struct irq_chip *chip,
 290                                 void *chip_data, irq_flow_handler_t handler,
 291                                 void *handler_data, const char *handler_name);
 292 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
 293 extern struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
 294                         unsigned int flags, unsigned int size,
 295                         struct device_node *node,
 296                         const struct irq_domain_ops *ops, void *host_data);
 297 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
 298                                    unsigned int nr_irqs, int node, void *arg,
 299                                    bool realloc);
 300 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
 301 extern void irq_domain_activate_irq(struct irq_data *irq_data);
 302 extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
 303
 304 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
 305                         unsigned int nr_irqs, int node, void *arg)
 306 {
 307         return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false);
 308 }
 309
 310 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
 311                                          unsigned int virq,
 312                                          irq_hw_number_t hwirq,
 313                                          struct irq_chip *chip,
 314                                          void *chip_data);
 315 extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
 316 extern void irq_domain_free_irqs_common(struct irq_domain *domain,
 317                                         unsigned int virq,
 318                                         unsigned int nr_irqs);
 319 extern void irq_domain_free_irqs_top(struct irq_domain *domain,
 320                                      unsigned int virq, unsigned int nr_irqs);
 321
 322 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
 323                                         unsigned int irq_base,
 324                                         unsigned int nr_irqs, void *arg);
 325
 326 extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
 327                                         unsigned int irq_base,
 328                                         unsigned int nr_irqs);
 329
 330 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
 331 {
 332         return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
 333 }
 334 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
 335 static inline void irq_domain_activate_irq(struct irq_data *data) { }
 336 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
 337 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
 338                         unsigned int nr_irqs, int node, void *arg)
 339 {
 340         return -1;
 341 }
 342
 343 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
 344 {
 345         return false;
 346 }
 347 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
 348
 349 #else /* CONFIG_IRQ_DOMAIN */
 350 static inline void irq_dispose_mapping(unsigned int virq) { }
 351 static inline void irq_domain_activate_irq(struct irq_data *data) { }
 352 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
 353 #endif /* !CONFIG_IRQ_DOMAIN */
 354
 355 #endif /* _LINUX_IRQDOMAIN_H */