1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Counter interface 4 * Copyright (C) 2018 William Breathitt Gray 5 */ 6#ifndef _COUNTER_H_ 7#define _COUNTER_H_ 8 9#include <linux/cdev.h> 10#include <linux/device.h> 11#include <linux/kernel.h> 12#include <linux/kfifo.h> 13#include <linux/mutex.h> 14#include <linux/spinlock_types.h> 15#include <linux/types.h> 16#include <linux/wait.h> 17#include <uapi/linux/counter.h> 18 19struct counter_device; 20struct counter_count; 21struct counter_synapse; 22struct counter_signal; 23 24enum counter_comp_type { 25 COUNTER_COMP_U8, 26 COUNTER_COMP_U64, 27 COUNTER_COMP_BOOL, 28 COUNTER_COMP_SIGNAL_LEVEL, 29 COUNTER_COMP_FUNCTION, 30 COUNTER_COMP_SYNAPSE_ACTION, 31 COUNTER_COMP_ENUM, 32 COUNTER_COMP_COUNT_DIRECTION, 33 COUNTER_COMP_COUNT_MODE, 34 COUNTER_COMP_SIGNAL_POLARITY, 35 COUNTER_COMP_ARRAY, 36}; 37 38/** 39 * struct counter_comp - Counter component node 40 * @type: Counter component data type 41 * @name: device-specific component name 42 * @priv: component-relevant data 43 * @action_read: Synapse action mode read callback. The read value of the 44 * respective Synapse action mode should be passed back via 45 * the action parameter. 46 * @device_u8_read: Device u8 component read callback. The read value of the 47 * respective Device u8 component should be passed back via 48 * the val parameter. 49 * @count_u8_read: Count u8 component read callback. The read value of the 50 * respective Count u8 component should be passed back via 51 * the val parameter. 52 * @signal_u8_read: Signal u8 component read callback. The read value of the 53 * respective Signal u8 component should be passed back via 54 * the val parameter. 55 * @device_u32_read: Device u32 component read callback. The read value of 56 * the respective Device u32 component should be passed 57 * back via the val parameter. 58 * @count_u32_read: Count u32 component read callback. The read value of the 59 * respective Count u32 component should be passed back via 60 * the val parameter. 61 * @signal_u32_read: Signal u32 component read callback. The read value of 62 * the respective Signal u32 component should be passed 63 * back via the val parameter. 64 * @device_u64_read: Device u64 component read callback. The read value of 65 * the respective Device u64 component should be passed 66 * back via the val parameter. 67 * @count_u64_read: Count u64 component read callback. The read value of the 68 * respective Count u64 component should be passed back via 69 * the val parameter. 70 * @signal_u64_read: Signal u64 component read callback. The read value of 71 * the respective Signal u64 component should be passed 72 * back via the val parameter. 73 * @signal_array_u32_read: Signal u32 array component read callback. The 74 * index of the respective Count u32 array 75 * component element is passed via the idx 76 * parameter. The read value of the respective 77 * Count u32 array component element should be 78 * passed back via the val parameter. 79 * @device_array_u64_read: Device u64 array component read callback. The 80 * index of the respective Device u64 array 81 * component element is passed via the idx 82 * parameter. The read value of the respective 83 * Device u64 array component element should be 84 * passed back via the val parameter. 85 * @count_array_u64_read: Count u64 array component read callback. The 86 * index of the respective Count u64 array 87 * component element is passed via the idx 88 * parameter. The read value of the respective 89 * Count u64 array component element should be 90 * passed back via the val parameter. 91 * @signal_array_u64_read: Signal u64 array component read callback. The 92 * index of the respective Count u64 array 93 * component element is passed via the idx 94 * parameter. The read value of the respective 95 * Count u64 array component element should be 96 * passed back via the val parameter. 97 * @action_write: Synapse action mode write callback. The write value of 98 * the respective Synapse action mode is passed via the 99 * action parameter. 100 * @device_u8_write: Device u8 component write callback. The write value of 101 * the respective Device u8 component is passed via the val 102 * parameter. 103 * @count_u8_write: Count u8 component write callback. The write value of 104 * the respective Count u8 component is passed via the val 105 * parameter. 106 * @signal_u8_write: Signal u8 component write callback. The write value of 107 * the respective Signal u8 component is passed via the val 108 * parameter. 109 * @device_u32_write: Device u32 component write callback. The write value of 110 * the respective Device u32 component is passed via the 111 * val parameter. 112 * @count_u32_write: Count u32 component write callback. The write value of 113 * the respective Count u32 component is passed via the val 114 * parameter. 115 * @signal_u32_write: Signal u32 component write callback. The write value of 116 * the respective Signal u32 component is passed via the 117 * val parameter. 118 * @device_u64_write: Device u64 component write callback. The write value of 119 * the respective Device u64 component is passed via the 120 * val parameter. 121 * @count_u64_write: Count u64 component write callback. The write value of 122 * the respective Count u64 component is passed via the val 123 * parameter. 124 * @signal_u64_write: Signal u64 component write callback. The write value of 125 * the respective Signal u64 component is passed via the 126 * val parameter. 127 * @signal_array_u32_write: Signal u32 array component write callback. The 128 * index of the respective Signal u32 array 129 * component element is passed via the idx 130 * parameter. The write value of the respective 131 * Signal u32 array component element is passed via 132 * the val parameter. 133 * @device_array_u64_write: Device u64 array component write callback. The 134 * index of the respective Device u64 array 135 * component element is passed via the idx 136 * parameter. The write value of the respective 137 * Device u64 array component element is passed via 138 * the val parameter. 139 * @count_array_u64_write: Count u64 array component write callback. The 140 * index of the respective Count u64 array 141 * component element is passed via the idx 142 * parameter. The write value of the respective 143 * Count u64 array component element is passed via 144 * the val parameter. 145 * @signal_array_u64_write: Signal u64 array component write callback. The 146 * index of the respective Signal u64 array 147 * component element is passed via the idx 148 * parameter. The write value of the respective 149 * Signal u64 array component element is passed via 150 * the val parameter. 151 */ 152struct counter_comp { 153 enum counter_comp_type type; 154 const char *name; 155 void *priv; 156 union { 157 int (*action_read)(struct counter_device *counter, 158 struct counter_count *count, 159 struct counter_synapse *synapse, 160 enum counter_synapse_action *action); 161 int (*device_u8_read)(struct counter_device *counter, u8 *val); 162 int (*count_u8_read)(struct counter_device *counter, 163 struct counter_count *count, u8 *val); 164 int (*signal_u8_read)(struct counter_device *counter, 165 struct counter_signal *signal, u8 *val); 166 int (*device_u32_read)(struct counter_device *counter, 167 u32 *val); 168 int (*count_u32_read)(struct counter_device *counter, 169 struct counter_count *count, u32 *val); 170 int (*signal_u32_read)(struct counter_device *counter, 171 struct counter_signal *signal, u32 *val); 172 int (*device_u64_read)(struct counter_device *counter, 173 u64 *val); 174 int (*count_u64_read)(struct counter_device *counter, 175 struct counter_count *count, u64 *val); 176 int (*signal_u64_read)(struct counter_device *counter, 177 struct counter_signal *signal, u64 *val); 178 int (*signal_array_u32_read)(struct counter_device *counter, 179 struct counter_signal *signal, 180 size_t idx, u32 *val); 181 int (*device_array_u64_read)(struct counter_device *counter, 182 size_t idx, u64 *val); 183 int (*count_array_u64_read)(struct counter_device *counter, 184 struct counter_count *count, 185 size_t idx, u64 *val); 186 int (*signal_array_u64_read)(struct counter_device *counter, 187 struct counter_signal *signal, 188 size_t idx, u64 *val); 189 }; 190 union { 191 int (*action_write)(struct counter_device *counter, 192 struct counter_count *count, 193 struct counter_synapse *synapse, 194 enum counter_synapse_action action); 195 int (*device_u8_write)(struct counter_device *counter, u8 val); 196 int (*count_u8_write)(struct counter_device *counter, 197 struct counter_count *count, u8 val); 198 int (*signal_u8_write)(struct counter_device *counter, 199 struct counter_signal *signal, u8 val); 200 int (*device_u32_write)(struct counter_device *counter, 201 u32 val); 202 int (*count_u32_write)(struct counter_device *counter, 203 struct counter_count *count, u32 val); 204 int (*signal_u32_write)(struct counter_device *counter, 205 struct counter_signal *signal, u32 val); 206 int (*device_u64_write)(struct counter_device *counter, 207 u64 val); 208 int (*count_u64_write)(struct counter_device *counter, 209 struct counter_count *count, u64 val); 210 int (*signal_u64_write)(struct counter_device *counter, 211 struct counter_signal *signal, u64 val); 212 int (*signal_array_u32_write)(struct counter_device *counter, 213 struct counter_signal *signal, 214 size_t idx, u32 val); 215 int (*device_array_u64_write)(struct counter_device *counter, 216 size_t idx, u64 val); 217 int (*count_array_u64_write)(struct counter_device *counter, 218 struct counter_count *count, 219 size_t idx, u64 val); 220 int (*signal_array_u64_write)(struct counter_device *counter, 221 struct counter_signal *signal, 222 size_t idx, u64 val); 223 }; 224}; 225 226/** 227 * struct counter_signal - Counter Signal node 228 * @id: unique ID used to identify the Signal 229 * @name: device-specific Signal name 230 * @ext: optional array of Signal extensions 231 * @num_ext: number of Signal extensions specified in @ext 232 */ 233struct counter_signal { 234 int id; 235 const char *name; 236 237 struct counter_comp *ext; 238 size_t num_ext; 239}; 240 241/** 242 * struct counter_synapse - Counter Synapse node 243 * @actions_list: array of available action modes 244 * @num_actions: number of action modes specified in @actions_list 245 * @signal: pointer to the associated Signal 246 */ 247struct counter_synapse { 248 const enum counter_synapse_action *actions_list; 249 size_t num_actions; 250 251 struct counter_signal *signal; 252}; 253 254/** 255 * struct counter_count - Counter Count node 256 * @id: unique ID used to identify the Count 257 * @name: device-specific Count name 258 * @functions_list: array of available function modes 259 * @num_functions: number of function modes specified in @functions_list 260 * @synapses: array of Synapses for initialization 261 * @num_synapses: number of Synapses specified in @synapses 262 * @ext: optional array of Count extensions 263 * @num_ext: number of Count extensions specified in @ext 264 */ 265struct counter_count { 266 int id; 267 const char *name; 268 269 const enum counter_function *functions_list; 270 size_t num_functions; 271 272 struct counter_synapse *synapses; 273 size_t num_synapses; 274 275 struct counter_comp *ext; 276 size_t num_ext; 277}; 278 279/** 280 * struct counter_event_node - Counter Event node 281 * @l: list of current watching Counter events 282 * @event: event that triggers 283 * @channel: event channel 284 * @comp_list: list of components to watch when event triggers 285 */ 286struct counter_event_node { 287 struct list_head l; 288 u8 event; 289 u8 channel; 290 struct list_head comp_list; 291}; 292 293/** 294 * struct counter_ops - Callbacks from driver 295 * @signal_read: optional read callback for Signals. The read level of 296 * the respective Signal should be passed back via the 297 * level parameter. 298 * @count_read: read callback for Counts. The read value of the 299 * respective Count should be passed back via the value 300 * parameter. 301 * @count_write: optional write callback for Counts. The write value for 302 * the respective Count is passed in via the value 303 * parameter. 304 * @function_read: read callback the Count function modes. The read 305 * function mode of the respective Count should be passed 306 * back via the function parameter. 307 * @function_write: optional write callback for Count function modes. The 308 * function mode to write for the respective Count is 309 * passed in via the function parameter. 310 * @action_read: optional read callback the Synapse action modes. The 311 * read action mode of the respective Synapse should be 312 * passed back via the action parameter. 313 * @action_write: optional write callback for Synapse action modes. The 314 * action mode to write for the respective Synapse is 315 * passed in via the action parameter. 316 * @events_configure: optional write callback to configure events. The list of 317 * struct counter_event_node may be accessed via the 318 * events_list member of the counter parameter. 319 * @watch_validate: optional callback to validate a watch. The Counter 320 * component watch configuration is passed in via the watch 321 * parameter. A return value of 0 indicates a valid Counter 322 * component watch configuration. 323 */ 324struct counter_ops { 325 int (*signal_read)(struct counter_device *counter, 326 struct counter_signal *signal, 327 enum counter_signal_level *level); 328 int (*count_read)(struct counter_device *counter, 329 struct counter_count *count, u64 *value); 330 int (*count_write)(struct counter_device *counter, 331 struct counter_count *count, u64 value); 332 int (*function_read)(struct counter_device *counter, 333 struct counter_count *count, 334 enum counter_function *function); 335 int (*function_write)(struct counter_device *counter, 336 struct counter_count *count, 337 enum counter_function function); 338 int (*action_read)(struct counter_device *counter, 339 struct counter_count *count, 340 struct counter_synapse *synapse, 341 enum counter_synapse_action *action); 342 int (*action_write)(struct counter_device *counter, 343 struct counter_count *count, 344 struct counter_synapse *synapse, 345 enum counter_synapse_action action); 346 int (*events_configure)(struct counter_device *counter); 347 int (*watch_validate)(struct counter_device *counter, 348 const struct counter_watch *watch); 349}; 350 351/** 352 * struct counter_device - Counter data structure 353 * @name: name of the device 354 * @parent: optional parent device providing the counters 355 * @ops: callbacks from driver 356 * @signals: array of Signals 357 * @num_signals: number of Signals specified in @signals 358 * @counts: array of Counts 359 * @num_counts: number of Counts specified in @counts 360 * @ext: optional array of Counter device extensions 361 * @num_ext: number of Counter device extensions specified in @ext 362 * @priv: optional private data supplied by driver 363 * @dev: internal device structure 364 * @chrdev: internal character device structure 365 * @events_list: list of current watching Counter events 366 * @events_list_lock: lock to protect Counter events list operations 367 * @next_events_list: list of next watching Counter events 368 * @n_events_list_lock: lock to protect Counter next events list operations 369 * @events: queue of detected Counter events 370 * @events_wait: wait queue to allow blocking reads of Counter events 371 * @events_in_lock: lock to protect Counter events queue in operations 372 * @events_out_lock: lock to protect Counter events queue out operations 373 * @ops_exist_lock: lock to prevent use during removal 374 */ 375struct counter_device { 376 const char *name; 377 struct device *parent; 378 379 const struct counter_ops *ops; 380 381 struct counter_signal *signals; 382 size_t num_signals; 383 struct counter_count *counts; 384 size_t num_counts; 385 386 struct counter_comp *ext; 387 size_t num_ext; 388 389 struct device dev; 390 struct cdev chrdev; 391 struct list_head events_list; 392 spinlock_t events_list_lock; 393 struct list_head next_events_list; 394 struct mutex n_events_list_lock; 395 DECLARE_KFIFO_PTR(events, struct counter_event); 396 wait_queue_head_t events_wait; 397 spinlock_t events_in_lock; 398 struct mutex events_out_lock; 399 struct mutex ops_exist_lock; 400}; 401 402void *counter_priv(const struct counter_device *const counter) __attribute_const__; 403 404struct counter_device *counter_alloc(size_t sizeof_priv); 405void counter_put(struct counter_device *const counter); 406int counter_add(struct counter_device *const counter); 407 408void counter_unregister(struct counter_device *const counter); 409struct counter_device *devm_counter_alloc(struct device *dev, 410 size_t sizeof_priv); 411int devm_counter_add(struct device *dev, 412 struct counter_device *const counter); 413void counter_push_event(struct counter_device *const counter, const u8 event, 414 const u8 channel); 415 416#define COUNTER_COMP_DEVICE_U8(_name, _read, _write) \ 417{ \ 418 .type = COUNTER_COMP_U8, \ 419 .name = (_name), \ 420 .device_u8_read = (_read), \ 421 .device_u8_write = (_write), \ 422} 423#define COUNTER_COMP_COUNT_U8(_name, _read, _write) \ 424{ \ 425 .type = COUNTER_COMP_U8, \ 426 .name = (_name), \ 427 .count_u8_read = (_read), \ 428 .count_u8_write = (_write), \ 429} 430#define COUNTER_COMP_SIGNAL_U8(_name, _read, _write) \ 431{ \ 432 .type = COUNTER_COMP_U8, \ 433 .name = (_name), \ 434 .signal_u8_read = (_read), \ 435 .signal_u8_write = (_write), \ 436} 437 438#define COUNTER_COMP_DEVICE_U64(_name, _read, _write) \ 439{ \ 440 .type = COUNTER_COMP_U64, \ 441 .name = (_name), \ 442 .device_u64_read = (_read), \ 443 .device_u64_write = (_write), \ 444} 445#define COUNTER_COMP_COUNT_U64(_name, _read, _write) \ 446{ \ 447 .type = COUNTER_COMP_U64, \ 448 .name = (_name), \ 449 .count_u64_read = (_read), \ 450 .count_u64_write = (_write), \ 451} 452#define COUNTER_COMP_SIGNAL_U64(_name, _read, _write) \ 453{ \ 454 .type = COUNTER_COMP_U64, \ 455 .name = (_name), \ 456 .signal_u64_read = (_read), \ 457 .signal_u64_write = (_write), \ 458} 459 460#define COUNTER_COMP_DEVICE_BOOL(_name, _read, _write) \ 461{ \ 462 .type = COUNTER_COMP_BOOL, \ 463 .name = (_name), \ 464 .device_u8_read = (_read), \ 465 .device_u8_write = (_write), \ 466} 467#define COUNTER_COMP_COUNT_BOOL(_name, _read, _write) \ 468{ \ 469 .type = COUNTER_COMP_BOOL, \ 470 .name = (_name), \ 471 .count_u8_read = (_read), \ 472 .count_u8_write = (_write), \ 473} 474#define COUNTER_COMP_SIGNAL_BOOL(_name, _read, _write) \ 475{ \ 476 .type = COUNTER_COMP_BOOL, \ 477 .name = (_name), \ 478 .signal_u8_read = (_read), \ 479 .signal_u8_write = (_write), \ 480} 481 482struct counter_available { 483 union { 484 const u32 *enums; 485 const char *const *strs; 486 }; 487 size_t num_items; 488}; 489 490#define DEFINE_COUNTER_AVAILABLE(_name, _enums) \ 491 struct counter_available _name = { \ 492 .enums = (_enums), \ 493 .num_items = ARRAY_SIZE(_enums), \ 494 } 495 496#define DEFINE_COUNTER_ENUM(_name, _strs) \ 497 struct counter_available _name = { \ 498 .strs = (_strs), \ 499 .num_items = ARRAY_SIZE(_strs), \ 500 } 501 502#define COUNTER_COMP_DEVICE_ENUM(_name, _get, _set, _available) \ 503{ \ 504 .type = COUNTER_COMP_ENUM, \ 505 .name = (_name), \ 506 .device_u32_read = (_get), \ 507 .device_u32_write = (_set), \ 508 .priv = &(_available), \ 509} 510#define COUNTER_COMP_COUNT_ENUM(_name, _get, _set, _available) \ 511{ \ 512 .type = COUNTER_COMP_ENUM, \ 513 .name = (_name), \ 514 .count_u32_read = (_get), \ 515 .count_u32_write = (_set), \ 516 .priv = &(_available), \ 517} 518#define COUNTER_COMP_SIGNAL_ENUM(_name, _get, _set, _available) \ 519{ \ 520 .type = COUNTER_COMP_ENUM, \ 521 .name = (_name), \ 522 .signal_u32_read = (_get), \ 523 .signal_u32_write = (_set), \ 524 .priv = &(_available), \ 525} 526 527struct counter_array { 528 enum counter_comp_type type; 529 const struct counter_available *avail; 530 union { 531 size_t length; 532 size_t idx; 533 }; 534}; 535 536#define DEFINE_COUNTER_ARRAY_U64(_name, _length) \ 537 struct counter_array _name = { \ 538 .type = COUNTER_COMP_U64, \ 539 .length = (_length), \ 540 } 541 542#define DEFINE_COUNTER_ARRAY_CAPTURE(_name, _length) \ 543 DEFINE_COUNTER_ARRAY_U64(_name, _length) 544 545#define DEFINE_COUNTER_ARRAY_POLARITY(_name, _available, _length) \ 546 struct counter_array _name = { \ 547 .type = COUNTER_COMP_SIGNAL_POLARITY, \ 548 .avail = &(_available), \ 549 .length = (_length), \ 550 } 551 552#define COUNTER_COMP_DEVICE_ARRAY_U64(_name, _read, _write, _array) \ 553{ \ 554 .type = COUNTER_COMP_ARRAY, \ 555 .name = (_name), \ 556 .device_array_u64_read = (_read), \ 557 .device_array_u64_write = (_write), \ 558 .priv = &(_array), \ 559} 560#define COUNTER_COMP_COUNT_ARRAY_U64(_name, _read, _write, _array) \ 561{ \ 562 .type = COUNTER_COMP_ARRAY, \ 563 .name = (_name), \ 564 .count_array_u64_read = (_read), \ 565 .count_array_u64_write = (_write), \ 566 .priv = &(_array), \ 567} 568#define COUNTER_COMP_SIGNAL_ARRAY_U64(_name, _read, _write, _array) \ 569{ \ 570 .type = COUNTER_COMP_ARRAY, \ 571 .name = (_name), \ 572 .signal_array_u64_read = (_read), \ 573 .signal_array_u64_write = (_write), \ 574 .priv = &(_array), \ 575} 576 577#define COUNTER_COMP_CAPTURE(_read, _write) \ 578 COUNTER_COMP_COUNT_U64("capture", _read, _write) 579 580#define COUNTER_COMP_CEILING(_read, _write) \ 581 COUNTER_COMP_COUNT_U64("ceiling", _read, _write) 582 583#define COUNTER_COMP_COUNT_MODE(_read, _write, _available) \ 584{ \ 585 .type = COUNTER_COMP_COUNT_MODE, \ 586 .name = "count_mode", \ 587 .count_u32_read = (_read), \ 588 .count_u32_write = (_write), \ 589 .priv = &(_available), \ 590} 591 592#define COUNTER_COMP_DIRECTION(_read) \ 593{ \ 594 .type = COUNTER_COMP_COUNT_DIRECTION, \ 595 .name = "direction", \ 596 .count_u32_read = (_read), \ 597} 598 599#define COUNTER_COMP_ENABLE(_read, _write) \ 600 COUNTER_COMP_COUNT_BOOL("enable", _read, _write) 601 602#define COUNTER_COMP_FLOOR(_read, _write) \ 603 COUNTER_COMP_COUNT_U64("floor", _read, _write) 604 605#define COUNTER_COMP_POLARITY(_read, _write, _available) \ 606{ \ 607 .type = COUNTER_COMP_SIGNAL_POLARITY, \ 608 .name = "polarity", \ 609 .signal_u32_read = (_read), \ 610 .signal_u32_write = (_write), \ 611 .priv = &(_available), \ 612} 613 614#define COUNTER_COMP_PRESET(_read, _write) \ 615 COUNTER_COMP_COUNT_U64("preset", _read, _write) 616 617#define COUNTER_COMP_PRESET_ENABLE(_read, _write) \ 618 COUNTER_COMP_COUNT_BOOL("preset_enable", _read, _write) 619 620#define COUNTER_COMP_ARRAY_CAPTURE(_read, _write, _array) \ 621 COUNTER_COMP_COUNT_ARRAY_U64("capture", _read, _write, _array) 622 623#define COUNTER_COMP_ARRAY_POLARITY(_read, _write, _array) \ 624{ \ 625 .type = COUNTER_COMP_ARRAY, \ 626 .name = "polarity", \ 627 .signal_array_u32_read = (_read), \ 628 .signal_array_u32_write = (_write), \ 629 .priv = &(_array), \ 630} 631 632#endif /* _COUNTER_H_ */ 633