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