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 hooks for translating device tree or other
   9  * firmware interrupt representations into a hardware irq number that
  10  * can be mapped back to a Linux irq number without any extra platform
  11  * support code.
  12  *
  13  * Interrupt controller "domain" data structure. This could be defined as a
  14  * irq domain controller. That is, it handles the mapping between hardware
  15  * and virtual interrupt numbers for a given interrupt domain. The domain
  16  * structure is generally created by the PIC code for a given PIC instance
  17  * (though a domain can cover more than one PIC if they have a flat number
  18  * model). It's the domain callbacks that are responsible for setting the
  19  * irq_chip on a given irq_desc after it's been mapped.
  20  *
  21  * The host code and data structures use a fwnode_handle pointer to
  22  * identify the domain. In some cases, and in order to preserve source
  23  * code compatibility, this fwnode pointer is "upgraded" to a DT
  24  * device_node. For those firmware infrastructures that do not provide
  25  * a unique identifier for an interrupt controller, the irq_domain
  26  * code offers a fwnode allocator.
  27  */
  28
  29 #ifndef _LINUX_IRQDOMAIN_H
  30 #define _LINUX_IRQDOMAIN_H
  31
  32 #include <linux/types.h>
  33 #include <linux/irqhandler.h>
  34 #include <linux/of.h>
  35 #include <linux/radix-tree.h>
  36
  37 struct device_node;
  38 struct irq_domain;
  39 struct of_device_id;
  40 struct irq_chip;
  41 struct irq_data;
  42 struct cpumask;
  43
  44 /* Number of irqs reserved for a legacy isa controller */
  45 #define NUM_ISA_INTERRUPTS      16
  46
  47 #define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16
  48
  49 /**
  50  * struct irq_fwspec - generic IRQ specifier structure
  51  *
  52  * @fwnode:             Pointer to a firmware-specific descriptor
  53  * @param_count:        Number of device-specific parameters
  54  * @param:              Device-specific parameters
  55  *
  56  * This structure, directly modeled after of_phandle_args, is used to
  57  * pass a device-specific description of an interrupt.
  58  */
  59 struct irq_fwspec {
  60         struct fwnode_handle *fwnode;
  61         int param_count;
  62         u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
  63 };
  64
  65 /*
  66  * Should several domains have the same device node, but serve
  67  * different purposes (for example one domain is for PCI/MSI, and the
  68  * other for wired IRQs), they can be distinguished using a
  69  * bus-specific token. Most domains are expected to only carry
  70  * DOMAIN_BUS_ANY.
  71  */
  72 enum irq_domain_bus_token {
  73         DOMAIN_BUS_ANY          = 0,
  74         DOMAIN_BUS_WIRED,
  75         DOMAIN_BUS_PCI_MSI,
  76         DOMAIN_BUS_PLATFORM_MSI,
  77         DOMAIN_BUS_NEXUS,
  78         DOMAIN_BUS_IPI,
  79         DOMAIN_BUS_FSL_MC_MSI,
  80 };
  81
  82 /**
  83  * struct irq_domain_ops - Methods for irq_domain objects
  84  * @match: Match an interrupt controller device node to a host, returns
  85  *         1 on a match
  86  * @map: Create or update a mapping between a virtual irq number and a hw
  87  *       irq number. This is called only once for a given mapping.
  88  * @unmap: Dispose of such a mapping
  89  * @xlate: Given a device tree node and interrupt specifier, decode
  90  *         the hardware irq number and linux irq type value.
  91  *
  92  * Functions below are provided by the driver and called whenever a new mapping
  93  * is created or an old mapping is disposed. The driver can then proceed to
  94  * whatever internal data structures management is required. It also needs
  95  * to setup the irq_desc when returning from map().
  96  */
  97 struct irq_domain_ops {
  98         int (*match)(struct irq_domain *d, struct device_node *node,
  99                      enum irq_domain_bus_token bus_token);
 100         int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec,
 101                       enum irq_domain_bus_token bus_token);
 102         int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
 103         void (*unmap)(struct irq_domain *d, unsigned int virq);
 104         int (*xlate)(struct irq_domain *d, struct device_node *node,
 105                      const u32 *intspec, unsigned int intsize,
 106                      unsigned long *out_hwirq, unsigned int *out_type);
 107
 108 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
 109         /* extended V2 interfaces to support hierarchy irq_domains */
 110         int (*alloc)(struct irq_domain *d, unsigned int virq,
 111                      unsigned int nr_irqs, void *arg);
 112         void (*free)(struct irq_domain *d, unsigned int virq,
 113                      unsigned int nr_irqs);
 114         void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
 115         void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
 116         int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
 117                          unsigned long *out_hwirq, unsigned int *out_type);
 118 #endif
 119 };
 120
 121 extern struct irq_domain_ops irq_generic_chip_ops;
 122
 123 struct irq_domain_chip_generic;
 124
 125 /**
 126  * struct irq_domain - Hardware interrupt number translation object
 127  * @link: Element in global irq_domain list.
 128  * @name: Name of interrupt domain
 129  * @ops: pointer to irq_domain methods
 130  * @host_data: private data pointer for use by owner.  Not touched by irq_domain
 131  *             core code.
 132  * @flags: host per irq_domain flags
 133  *
 134  * Optional elements
 135  * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
 136  *           when decoding device tree interrupt specifiers.
 137  * @gc: Pointer to a list of generic chips. There is a helper function for
 138  *      setting up one or more generic chips for interrupt controllers
 139  *      drivers using the generic chip library which uses this pointer.
 140  * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
 141  *
 142  * Revmap data, used internally by irq_domain
 143  * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
 144  *                         support direct mapping
 145  * @revmap_size: Size of the linear map table @linear_revmap[]
 146  * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
 147  * @linear_revmap: Linear table of hwirq->virq reverse mappings
 148  */
 149 struct irq_domain {
 150         struct list_head link;
 151         const char *name;
 152         const struct irq_domain_ops *ops;
 153         void *host_data;
 154         unsigned int flags;
 155
 156         /* Optional data */
 157         struct fwnode_handle *fwnode;
 158         enum irq_domain_bus_token bus_token;
 159         struct irq_domain_chip_generic *gc;
 160 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
 161         struct irq_domain *parent;
 162 #endif
 163
 164         /* reverse map data. The linear map gets appended to the irq_domain */
 165         irq_hw_number_t hwirq_max;
 166         unsigned int revmap_direct_max_irq;
 167         unsigned int revmap_size;
 168         struct radix_tree_root revmap_tree;
 169         unsigned int linear_revmap[];
 170 };
 171
 172 /* Irq domain flags */
 173 enum {
 174         /* Irq domain is hierarchical */
 175         IRQ_DOMAIN_FLAG_HIERARCHY       = (1 << 0),
 176
 177         /* Core calls alloc/free recursive through the domain hierarchy. */
 178         IRQ_DOMAIN_FLAG_AUTO_RECURSIVE  = (1 << 1),
 179
 180         /* Irq domain is an IPI domain with virq per cpu */
 181         IRQ_DOMAIN_FLAG_IPI_PER_CPU     = (1 << 2),
 182
 183         /* Irq domain is an IPI domain with single virq */
 184         IRQ_DOMAIN_FLAG_IPI_SINGLE      = (1 << 3),
 185
 186         /*
 187          * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
 188          * for implementation specific purposes and ignored by the
 189          * core code.
 190          */
 191         IRQ_DOMAIN_FLAG_NONCORE         = (1 << 16),
 192 };
 193
 194 static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
 195 {
 196         return to_of_node(d->fwnode);
 197 }
 198
 199 #ifdef CONFIG_IRQ_DOMAIN
 200 struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
 201 void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
 202 struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, int size,
 203                                     irq_hw_number_t hwirq_max, int direct_max,
 204                                     const struct irq_domain_ops *ops,
 205                                     void *host_data);
 206 struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
 207                                          unsigned int size,
 208                                          unsigned int first_irq,
 209                                          const struct irq_domain_ops *ops,
 210                                          void *host_data);
 211 struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 212                                          unsigned int size,
 213                                          unsigned int first_irq,
 214                                          irq_hw_number_t first_hwirq,
 215                                          const struct irq_domain_ops *ops,
 216                                          void *host_data);
 217 extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
 218                                                    enum irq_domain_bus_token bus_token);
 219 extern void irq_set_default_host(struct irq_domain *host);
 220 extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
 221                                   irq_hw_number_t hwirq, int node,
 222                                   const struct cpumask *affinity);
 223
 224 static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
 225 {
 226         return node ? &node->fwnode : NULL;
 227 }
 228
 229 static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode)
 230 {
 231         return fwnode && fwnode->type == FWNODE_IRQCHIP;
 232 }
 233
 234 static inline
 235 struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
 236                                             enum irq_domain_bus_token bus_token)
 237 {
 238         struct irq_fwspec fwspec = {
 239                 .fwnode = fwnode,
 240         };
 241
 242         return irq_find_matching_fwspec(&fwspec, bus_token);
 243 }
 244
 245 static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
 246                                                         enum irq_domain_bus_token bus_token)
 247 {
 248         return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token);
 249 }
 250
 251 static inline struct irq_domain *irq_find_host(struct device_node *node)
 252 {
 253         return irq_find_matching_host(node, DOMAIN_BUS_ANY);
 254 }
 255
 256 /**
 257  * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
 258  * @of_node: pointer to interrupt controller's device tree node.
 259  * @size: Number of interrupts in the domain.
 260  * @ops: map/unmap domain callbacks
 261  * @host_data: Controller private data pointer
 262  */
 263 static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
 264                                          unsigned int size,
 265                                          const struct irq_domain_ops *ops,
 266                                          void *host_data)
 267 {
 268         return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
 269 }
 270 static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
 271                                          unsigned int max_irq,
 272                                          const struct irq_domain_ops *ops,
 273                                          void *host_data)
 274 {
 275         return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data);
 276 }
 277 static inline struct irq_domain *irq_domain_add_legacy_isa(
 278                                 struct device_node *of_node,
 279                                 const struct irq_domain_ops *ops,
 280                                 void *host_data)
 281 {
 282         return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
 283                                      host_data);
 284 }
 285 static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
 286                                          const struct irq_domain_ops *ops,
 287                                          void *host_data)
 288 {
 289         return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data);
 290 }
 291
 292 static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode,
 293                                          unsigned int size,
 294                                          const struct irq_domain_ops *ops,
 295                                          void *host_data)
 296 {
 297         return __irq_domain_add(fwnode, size, size, 0, ops, host_data);
 298 }
 299
 300 static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
 301                                          const struct irq_domain_ops *ops,
 302                                          void *host_data)
 303 {
 304         return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data);
 305 }
 306
 307 extern void irq_domain_remove(struct irq_domain *host);
 308
 309 extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
 310                                         irq_hw_number_t hwirq);
 311 extern void irq_domain_associate_many(struct irq_domain *domain,
 312                                       unsigned int irq_base,
 313                                       irq_hw_number_t hwirq_base, int count);
 314 extern void irq_domain_disassociate(struct irq_domain *domain,
 315                                     unsigned int irq);
 316
 317 extern unsigned int irq_create_mapping(struct irq_domain *host,
 318                                        irq_hw_number_t hwirq);
 319 extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
 320 extern void irq_dispose_mapping(unsigned int virq);
 321
 322 /**
 323  * irq_linear_revmap() - Find a linux irq from a hw irq number.
 324  * @domain: domain owning this hardware interrupt
 325  * @hwirq: hardware irq number in that domain space
 326  *
 327  * This is a fast path alternative to irq_find_mapping() that can be
 328  * called directly by irq controller code to save a handful of
 329  * instructions. It is always safe to call, but won't find irqs mapped
 330  * using the radix tree.
 331  */
 332 static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
 333                                              irq_hw_number_t hwirq)
 334 {
 335         return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
 336 }
 337 extern unsigned int irq_find_mapping(struct irq_domain *host,
 338                                      irq_hw_number_t hwirq);
 339 extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
 340 extern int irq_create_strict_mappings(struct irq_domain *domain,
 341                                       unsigned int irq_base,
 342                                       irq_hw_number_t hwirq_base, int count);
 343
 344 static inline int irq_create_identity_mapping(struct irq_domain *host,
 345                                               irq_hw_number_t hwirq)
 346 {
 347         return irq_create_strict_mappings(host, hwirq, hwirq, 1);
 348 }
 349
 350 extern const struct irq_domain_ops irq_domain_simple_ops;
 351
 352 /* stock xlate functions */
 353 int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
 354                         const u32 *intspec, unsigned int intsize,
 355                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
 356 int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
 357                         const u32 *intspec, unsigned int intsize,
 358                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
 359 int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
 360                         const u32 *intspec, unsigned int intsize,
 361                         irq_hw_number_t *out_hwirq, unsigned int *out_type);
 362
 363 /* IPI functions */
 364 int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest);
 365 int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest);
 366
 367 /* V2 interfaces to support hierarchy IRQ domains. */
 368 extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
 369                                                 unsigned int virq);
 370 extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
 371                                 irq_hw_number_t hwirq, struct irq_chip *chip,
 372                                 void *chip_data, irq_flow_handler_t handler,
 373                                 void *handler_data, const char *handler_name);
 374 #ifdef  CONFIG_IRQ_DOMAIN_HIERARCHY
 375 extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
 376                         unsigned int flags, unsigned int size,
 377                         struct fwnode_handle *fwnode,
 378                         const struct irq_domain_ops *ops, void *host_data);
 379
 380 static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
 381                                             unsigned int flags,
 382                                             unsigned int size,
 383                                             struct device_node *node,
 384                                             const struct irq_domain_ops *ops,
 385                                             void *host_data)
 386 {
 387         return irq_domain_create_hierarchy(parent, flags, size,
 388                                            of_node_to_fwnode(node),
 389                                            ops, host_data);
 390 }
 391
 392 extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
 393                                    unsigned int nr_irqs, int node, void *arg,
 394                                    bool realloc, const struct cpumask *affinity);
 395 extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
 396 extern void irq_domain_activate_irq(struct irq_data *irq_data);
 397 extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
 398
 399 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
 400                         unsigned int nr_irqs, int node, void *arg)
 401 {
 402         return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false,
 403                                        NULL);
 404 }
 405
 406 extern int irq_domain_alloc_irqs_recursive(struct irq_domain *domain,
 407                                            unsigned int irq_base,
 408                                            unsigned int nr_irqs, void *arg);
 409 extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
 410                                          unsigned int virq,
 411                                          irq_hw_number_t hwirq,
 412                                          struct irq_chip *chip,
 413                                          void *chip_data);
 414 extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
 415 extern void irq_domain_free_irqs_common(struct irq_domain *domain,
 416                                         unsigned int virq,
 417                                         unsigned int nr_irqs);
 418 extern void irq_domain_free_irqs_top(struct irq_domain *domain,
 419                                      unsigned int virq, unsigned int nr_irqs);
 420
 421 extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
 422                                         unsigned int irq_base,
 423                                         unsigned int nr_irqs, void *arg);
 424
 425 extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
 426                                         unsigned int irq_base,
 427                                         unsigned int nr_irqs);
 428
 429 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
 430 {
 431         return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
 432 }
 433
 434 static inline bool irq_domain_is_ipi(struct irq_domain *domain)
 435 {
 436         return domain->flags &
 437                 (IRQ_DOMAIN_FLAG_IPI_PER_CPU | IRQ_DOMAIN_FLAG_IPI_SINGLE);
 438 }
 439
 440 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
 441 {
 442         return domain->flags & IRQ_DOMAIN_FLAG_IPI_PER_CPU;
 443 }
 444
 445 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
 446 {
 447         return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE;
 448 }
 449 #else   /* CONFIG_IRQ_DOMAIN_HIERARCHY */
 450 static inline void irq_domain_activate_irq(struct irq_data *data) { }
 451 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
 452 static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
 453                         unsigned int nr_irqs, int node, void *arg)
 454 {
 455         return -1;
 456 }
 457
 458 static inline void irq_domain_free_irqs(unsigned int virq,
 459                                         unsigned int nr_irqs) { }
 460
 461 static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
 462 {
 463         return false;
 464 }
 465
 466 static inline bool irq_domain_is_ipi(struct irq_domain *domain)
 467 {
 468         return false;
 469 }
 470
 471 static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
 472 {
 473         return false;
 474 }
 475
 476 static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
 477 {
 478         return false;
 479 }
 480 #endif  /* CONFIG_IRQ_DOMAIN_HIERARCHY */
 481
 482 #else /* CONFIG_IRQ_DOMAIN */
 483 static inline void irq_dispose_mapping(unsigned int virq) { }
 484 static inline void irq_domain_activate_irq(struct irq_data *data) { }
 485 static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
 486 static inline struct irq_domain *irq_find_matching_fwnode(
 487         struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)
 488 {
 489         return NULL;
 490 }
 491 #endif /* !CONFIG_IRQ_DOMAIN */
 492
 493 #endif /* _LINUX_IRQDOMAIN_H */