1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Xilinx Event Management Driver
4 *
5 * Copyright (C) 2021 Xilinx, Inc.
6 * Copyright (C) 2024 Advanced Micro Devices, Inc.
7 *
8 * Abhyuday Godhasara <abhyuday.godhasara@xilinx.com>
9 */
10
11 #include <linux/cpuhotplug.h>
12 #include <linux/firmware/xlnx-event-manager.h>
13 #include <linux/firmware/xlnx-zynqmp.h>
14 #include <linux/hashtable.h>
15 #include <linux/interrupt.h>
16 #include <linux/irq.h>
17 #include <linux/irqdomain.h>
18 #include <linux/module.h>
19 #include <linux/of_irq.h>
20 #include <linux/platform_device.h>
21 #include <linux/slab.h>
22
23 static DEFINE_PER_CPU_READ_MOSTLY(int, dummy_cpu_number);
24
25 static int virq_sgi;
26 static int event_manager_availability = -EACCES;
27
28 /* SGI number used for Event management driver */
29 #define XLNX_EVENT_SGI_NUM (15)
30
31 /* Max number of driver can register for same event */
32 #define MAX_DRIVER_PER_EVENT (10U)
33
34 /* Max HashMap Order for PM API feature check (1<<7 = 128) */
35 #define REGISTERED_DRIVER_MAX_ORDER (7)
36
37 #define MAX_BITS (32U) /* Number of bits available for error mask */
38
39 #define REGISTER_NOTIFIER_FIRMWARE_VERSION (2U)
40
41 static DEFINE_HASHTABLE(reg_driver_map, REGISTERED_DRIVER_MAX_ORDER);
42 static int sgi_num = XLNX_EVENT_SGI_NUM;
43
44 static bool is_need_to_unregister;
45
46 /**
47 * struct agent_cb - Registered callback function and private data.
48 * @agent_data: Data passed back to handler function.
49 * @eve_cb: Function pointer to store the callback function.
50 * @list: member to create list.
51 */
52 struct agent_cb {
53 void *agent_data;
54 event_cb_func_t eve_cb;
55 struct list_head list;
56 };
57
58 /**
59 * struct registered_event_data - Registered Event Data.
60 * @key: key is the combine id(Node-Id | Event-Id) of type u64
61 * where upper u32 for Node-Id and lower u32 for Event-Id,
62 * And this used as key to index into hashmap.
63 * @cb_type: Type of Api callback, like PM_NOTIFY_CB, etc.
64 * @wake: If this flag set, firmware will wake up processor if is
65 * in sleep or power down state.
66 * @cb_list_head: Head of call back data list which contain the information
67 * about registered handler and private data.
68 * @hentry: hlist_node that hooks this entry into hashtable.
69 */
70 struct registered_event_data {
71 u64 key;
72 enum pm_api_cb_id cb_type;
73 bool wake;
74 struct list_head cb_list_head;
75 struct hlist_node hentry;
76 };
77
xlnx_is_error_event(const u32 node_id)78 static bool xlnx_is_error_event(const u32 node_id)
79 {
80 u32 pm_family_code, pm_sub_family_code;
81
82 zynqmp_pm_get_family_info(&pm_family_code, &pm_sub_family_code);
83
84 if (pm_sub_family_code == VERSAL_SUB_FAMILY_CODE) {
85 if (node_id == VERSAL_EVENT_ERROR_PMC_ERR1 ||
86 node_id == VERSAL_EVENT_ERROR_PMC_ERR2 ||
87 node_id == VERSAL_EVENT_ERROR_PSM_ERR1 ||
88 node_id == VERSAL_EVENT_ERROR_PSM_ERR2)
89 return true;
90 } else {
91 if (node_id == VERSAL_NET_EVENT_ERROR_PMC_ERR1 ||
92 node_id == VERSAL_NET_EVENT_ERROR_PMC_ERR2 ||
93 node_id == VERSAL_NET_EVENT_ERROR_PMC_ERR3 ||
94 node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR1 ||
95 node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR2 ||
96 node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR3 ||
97 node_id == VERSAL_NET_EVENT_ERROR_PSM_ERR4)
98 return true;
99 }
100
101 return false;
102 }
103
xlnx_add_cb_for_notify_event(const u32 node_id,const u32 event,const bool wake,event_cb_func_t cb_fun,void * data)104 static int xlnx_add_cb_for_notify_event(const u32 node_id, const u32 event, const bool wake,
105 event_cb_func_t cb_fun, void *data)
106 {
107 u64 key = 0;
108 bool present_in_hash = false;
109 struct registered_event_data *eve_data;
110 struct agent_cb *cb_data;
111 struct agent_cb *cb_pos;
112 struct agent_cb *cb_next;
113
114 key = ((u64)node_id << 32U) | (u64)event;
115 /* Check for existing entry in hash table for given key id */
116 hash_for_each_possible(reg_driver_map, eve_data, hentry, key) {
117 if (eve_data->key == key) {
118 present_in_hash = true;
119 break;
120 }
121 }
122
123 if (!present_in_hash) {
124 /* Add new entry if not present in HASH table */
125 eve_data = kmalloc(sizeof(*eve_data), GFP_KERNEL);
126 if (!eve_data)
127 return -ENOMEM;
128 eve_data->key = key;
129 eve_data->cb_type = PM_NOTIFY_CB;
130 eve_data->wake = wake;
131 INIT_LIST_HEAD(&eve_data->cb_list_head);
132
133 cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
134 if (!cb_data) {
135 kfree(eve_data);
136 return -ENOMEM;
137 }
138 cb_data->eve_cb = cb_fun;
139 cb_data->agent_data = data;
140
141 /* Add into callback list */
142 list_add(&cb_data->list, &eve_data->cb_list_head);
143
144 /* Add into HASH table */
145 hash_add(reg_driver_map, &eve_data->hentry, key);
146 } else {
147 /* Search for callback function and private data in list */
148 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
149 if (cb_pos->eve_cb == cb_fun &&
150 cb_pos->agent_data == data) {
151 return 0;
152 }
153 }
154
155 /* Add multiple handler and private data in list */
156 cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
157 if (!cb_data)
158 return -ENOMEM;
159 cb_data->eve_cb = cb_fun;
160 cb_data->agent_data = data;
161
162 list_add(&cb_data->list, &eve_data->cb_list_head);
163 }
164
165 return 0;
166 }
167
xlnx_add_cb_for_suspend(event_cb_func_t cb_fun,void * data)168 static int xlnx_add_cb_for_suspend(event_cb_func_t cb_fun, void *data)
169 {
170 struct registered_event_data *eve_data;
171 struct agent_cb *cb_data;
172
173 /* Check for existing entry in hash table for given cb_type */
174 hash_for_each_possible(reg_driver_map, eve_data, hentry, PM_INIT_SUSPEND_CB) {
175 if (eve_data->cb_type == PM_INIT_SUSPEND_CB) {
176 pr_err("Found as already registered\n");
177 return -EINVAL;
178 }
179 }
180
181 /* Add new entry if not present */
182 eve_data = kmalloc(sizeof(*eve_data), GFP_KERNEL);
183 if (!eve_data)
184 return -ENOMEM;
185
186 eve_data->key = 0;
187 eve_data->cb_type = PM_INIT_SUSPEND_CB;
188 INIT_LIST_HEAD(&eve_data->cb_list_head);
189
190 cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
191 if (!cb_data)
192 return -ENOMEM;
193 cb_data->eve_cb = cb_fun;
194 cb_data->agent_data = data;
195
196 /* Add into callback list */
197 list_add(&cb_data->list, &eve_data->cb_list_head);
198
199 hash_add(reg_driver_map, &eve_data->hentry, PM_INIT_SUSPEND_CB);
200
201 return 0;
202 }
203
xlnx_remove_cb_for_suspend(event_cb_func_t cb_fun)204 static int xlnx_remove_cb_for_suspend(event_cb_func_t cb_fun)
205 {
206 bool is_callback_found = false;
207 struct registered_event_data *eve_data;
208 struct agent_cb *cb_pos;
209 struct agent_cb *cb_next;
210 struct hlist_node *tmp;
211
212 is_need_to_unregister = false;
213
214 /* Check for existing entry in hash table for given cb_type */
215 hash_for_each_possible_safe(reg_driver_map, eve_data, tmp, hentry, PM_INIT_SUSPEND_CB) {
216 if (eve_data->cb_type == PM_INIT_SUSPEND_CB) {
217 /* Delete the list of callback */
218 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
219 if (cb_pos->eve_cb == cb_fun) {
220 is_callback_found = true;
221 list_del_init(&cb_pos->list);
222 kfree(cb_pos);
223 }
224 }
225 /* remove an object from a hashtable */
226 hash_del(&eve_data->hentry);
227 kfree(eve_data);
228 is_need_to_unregister = true;
229 }
230 }
231 if (!is_callback_found) {
232 pr_warn("Didn't find any registered callback for suspend event\n");
233 return -EINVAL;
234 }
235
236 return 0;
237 }
238
xlnx_remove_cb_for_notify_event(const u32 node_id,const u32 event,event_cb_func_t cb_fun,void * data)239 static int xlnx_remove_cb_for_notify_event(const u32 node_id, const u32 event,
240 event_cb_func_t cb_fun, void *data)
241 {
242 bool is_callback_found = false;
243 struct registered_event_data *eve_data;
244 u64 key = ((u64)node_id << 32U) | (u64)event;
245 struct agent_cb *cb_pos;
246 struct agent_cb *cb_next;
247 struct hlist_node *tmp;
248
249 is_need_to_unregister = false;
250
251 /* Check for existing entry in hash table for given key id */
252 hash_for_each_possible_safe(reg_driver_map, eve_data, tmp, hentry, key) {
253 if (eve_data->key == key) {
254 /* Delete the list of callback */
255 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
256 if (cb_pos->eve_cb == cb_fun &&
257 cb_pos->agent_data == data) {
258 is_callback_found = true;
259 list_del_init(&cb_pos->list);
260 kfree(cb_pos);
261 }
262 }
263
264 /* Remove HASH table if callback list is empty */
265 if (list_empty(&eve_data->cb_list_head)) {
266 /* remove an object from a HASH table */
267 hash_del(&eve_data->hentry);
268 kfree(eve_data);
269 is_need_to_unregister = true;
270 }
271 }
272 }
273 if (!is_callback_found) {
274 pr_warn("Didn't find any registered callback for 0x%x 0x%x\n",
275 node_id, event);
276 return -EINVAL;
277 }
278
279 return 0;
280 }
281
282 /**
283 * xlnx_register_event() - Register for the event.
284 * @cb_type: Type of callback from pm_api_cb_id,
285 * PM_NOTIFY_CB - for Error Events,
286 * PM_INIT_SUSPEND_CB - for suspend callback.
287 * @node_id: Node-Id related to event.
288 * @event: Event Mask for the Error Event.
289 * @wake: Flag specifying whether the subsystem should be woken upon
290 * event notification.
291 * @cb_fun: Function pointer to store the callback function.
292 * @data: Pointer for the driver instance.
293 *
294 * Return: Returns 0 on successful registration else error code.
295 */
xlnx_register_event(const enum pm_api_cb_id cb_type,const u32 node_id,const u32 event,const bool wake,event_cb_func_t cb_fun,void * data)296 int xlnx_register_event(const enum pm_api_cb_id cb_type, const u32 node_id, const u32 event,
297 const bool wake, event_cb_func_t cb_fun, void *data)
298 {
299 int ret = 0;
300 u32 eve;
301 int pos;
302
303 if (event_manager_availability)
304 return event_manager_availability;
305
306 if (cb_type != PM_NOTIFY_CB && cb_type != PM_INIT_SUSPEND_CB) {
307 pr_err("%s() Unsupported Callback 0x%x\n", __func__, cb_type);
308 return -EINVAL;
309 }
310
311 if (!cb_fun)
312 return -EFAULT;
313
314 if (cb_type == PM_INIT_SUSPEND_CB) {
315 ret = xlnx_add_cb_for_suspend(cb_fun, data);
316 } else {
317 if (!xlnx_is_error_event(node_id)) {
318 /* Add entry for Node-Id/Event in hash table */
319 ret = xlnx_add_cb_for_notify_event(node_id, event, wake, cb_fun, data);
320 } else {
321 /* Add into Hash table */
322 for (pos = 0; pos < MAX_BITS; pos++) {
323 eve = event & (1 << pos);
324 if (!eve)
325 continue;
326
327 /* Add entry for Node-Id/Eve in hash table */
328 ret = xlnx_add_cb_for_notify_event(node_id, eve, wake, cb_fun,
329 data);
330 /* Break the loop if got error */
331 if (ret)
332 break;
333 }
334 if (ret) {
335 /* Skip the Event for which got the error */
336 pos--;
337 /* Remove registered(during this call) event from hash table */
338 for ( ; pos >= 0; pos--) {
339 eve = event & (1 << pos);
340 if (!eve)
341 continue;
342 xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data);
343 }
344 }
345 }
346
347 if (ret) {
348 pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__, node_id,
349 event, ret);
350 return ret;
351 }
352
353 /* Register for Node-Id/Event combination in firmware */
354 ret = zynqmp_pm_register_notifier(node_id, event, wake, true);
355 if (ret) {
356 pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__, node_id,
357 event, ret);
358 /* Remove already registered event from hash table */
359 if (xlnx_is_error_event(node_id)) {
360 for (pos = 0; pos < MAX_BITS; pos++) {
361 eve = event & (1 << pos);
362 if (!eve)
363 continue;
364 xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data);
365 }
366 } else {
367 xlnx_remove_cb_for_notify_event(node_id, event, cb_fun, data);
368 }
369 return ret;
370 }
371 }
372
373 return ret;
374 }
375 EXPORT_SYMBOL_GPL(xlnx_register_event);
376
377 /**
378 * xlnx_unregister_event() - Unregister for the event.
379 * @cb_type: Type of callback from pm_api_cb_id,
380 * PM_NOTIFY_CB - for Error Events,
381 * PM_INIT_SUSPEND_CB - for suspend callback.
382 * @node_id: Node-Id related to event.
383 * @event: Event Mask for the Error Event.
384 * @cb_fun: Function pointer of callback function.
385 * @data: Pointer of agent's private data.
386 *
387 * Return: Returns 0 on successful unregistration else error code.
388 */
xlnx_unregister_event(const enum pm_api_cb_id cb_type,const u32 node_id,const u32 event,event_cb_func_t cb_fun,void * data)389 int xlnx_unregister_event(const enum pm_api_cb_id cb_type, const u32 node_id, const u32 event,
390 event_cb_func_t cb_fun, void *data)
391 {
392 int ret = 0;
393 u32 eve, pos;
394
395 is_need_to_unregister = false;
396
397 if (event_manager_availability)
398 return event_manager_availability;
399
400 if (cb_type != PM_NOTIFY_CB && cb_type != PM_INIT_SUSPEND_CB) {
401 pr_err("%s() Unsupported Callback 0x%x\n", __func__, cb_type);
402 return -EINVAL;
403 }
404
405 if (!cb_fun)
406 return -EFAULT;
407
408 if (cb_type == PM_INIT_SUSPEND_CB) {
409 ret = xlnx_remove_cb_for_suspend(cb_fun);
410 } else {
411 /* Remove Node-Id/Event from hash table */
412 if (!xlnx_is_error_event(node_id)) {
413 xlnx_remove_cb_for_notify_event(node_id, event, cb_fun, data);
414 } else {
415 for (pos = 0; pos < MAX_BITS; pos++) {
416 eve = event & (1 << pos);
417 if (!eve)
418 continue;
419
420 xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data);
421 }
422 }
423
424 /* Un-register if list is empty */
425 if (is_need_to_unregister) {
426 /* Un-register for Node-Id/Event combination */
427 ret = zynqmp_pm_register_notifier(node_id, event, false, false);
428 if (ret) {
429 pr_err("%s() failed for 0x%x and 0x%x: %d\n",
430 __func__, node_id, event, ret);
431 return ret;
432 }
433 }
434 }
435
436 return ret;
437 }
438 EXPORT_SYMBOL_GPL(xlnx_unregister_event);
439
xlnx_call_suspend_cb_handler(const u32 * payload)440 static void xlnx_call_suspend_cb_handler(const u32 *payload)
441 {
442 bool is_callback_found = false;
443 struct registered_event_data *eve_data;
444 u32 cb_type = payload[0];
445 struct agent_cb *cb_pos;
446 struct agent_cb *cb_next;
447
448 /* Check for existing entry in hash table for given cb_type */
449 hash_for_each_possible(reg_driver_map, eve_data, hentry, cb_type) {
450 if (eve_data->cb_type == cb_type) {
451 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
452 cb_pos->eve_cb(&payload[0], cb_pos->agent_data);
453 is_callback_found = true;
454 }
455 }
456 }
457 if (!is_callback_found)
458 pr_warn("Didn't find any registered callback for suspend event\n");
459 }
460
xlnx_call_notify_cb_handler(const u32 * payload)461 static void xlnx_call_notify_cb_handler(const u32 *payload)
462 {
463 bool is_callback_found = false;
464 struct registered_event_data *eve_data;
465 u64 key = ((u64)payload[1] << 32U) | (u64)payload[2];
466 int ret;
467 struct agent_cb *cb_pos;
468 struct agent_cb *cb_next;
469
470 /* Check for existing entry in hash table for given key id */
471 hash_for_each_possible(reg_driver_map, eve_data, hentry, key) {
472 if (eve_data->key == key) {
473 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
474 cb_pos->eve_cb(&payload[0], cb_pos->agent_data);
475 is_callback_found = true;
476 }
477
478 /* re register with firmware to get future events */
479 ret = zynqmp_pm_register_notifier(payload[1], payload[2],
480 eve_data->wake, true);
481 if (ret) {
482 pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__,
483 payload[1], payload[2], ret);
484 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head,
485 list) {
486 /* Remove already registered event from hash table */
487 xlnx_remove_cb_for_notify_event(payload[1], payload[2],
488 cb_pos->eve_cb,
489 cb_pos->agent_data);
490 }
491 }
492 }
493 }
494 if (!is_callback_found)
495 pr_warn("Unhandled SGI node 0x%x event 0x%x. Expected with Xen hypervisor\n",
496 payload[1], payload[2]);
497 }
498
xlnx_get_event_callback_data(u32 * buf)499 static void xlnx_get_event_callback_data(u32 *buf)
500 {
501 zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, buf, 0);
502 }
503
xlnx_event_handler(int irq,void * dev_id)504 static irqreturn_t xlnx_event_handler(int irq, void *dev_id)
505 {
506 u32 cb_type, node_id, event, pos;
507 u32 payload[CB_MAX_PAYLOAD_SIZE] = {0};
508 u32 event_data[CB_MAX_PAYLOAD_SIZE] = {0};
509
510 /* Get event data */
511 xlnx_get_event_callback_data(payload);
512
513 /* First element is callback type, others are callback arguments */
514 cb_type = payload[0];
515
516 if (cb_type == PM_NOTIFY_CB) {
517 node_id = payload[1];
518 event = payload[2];
519 if (!xlnx_is_error_event(node_id)) {
520 xlnx_call_notify_cb_handler(payload);
521 } else {
522 /*
523 * Each call back function expecting payload as an input arguments.
524 * We can get multiple error events as in one call back through error
525 * mask. So payload[2] may can contain multiple error events.
526 * In reg_driver_map database we store data in the combination of single
527 * node_id-error combination.
528 * So coping the payload message into event_data and update the
529 * event_data[2] with Error Mask for single error event and use
530 * event_data as input argument for registered call back function.
531 *
532 */
533 memcpy(event_data, payload, (4 * CB_MAX_PAYLOAD_SIZE));
534 /* Support Multiple Error Event */
535 for (pos = 0; pos < MAX_BITS; pos++) {
536 if ((0 == (event & (1 << pos))))
537 continue;
538 event_data[2] = (event & (1 << pos));
539 xlnx_call_notify_cb_handler(event_data);
540 }
541 }
542 } else if (cb_type == PM_INIT_SUSPEND_CB) {
543 xlnx_call_suspend_cb_handler(payload);
544 } else {
545 pr_err("%s() Unsupported Callback %d\n", __func__, cb_type);
546 }
547
548 return IRQ_HANDLED;
549 }
550
xlnx_event_cpuhp_start(unsigned int cpu)551 static int xlnx_event_cpuhp_start(unsigned int cpu)
552 {
553 enable_percpu_irq(virq_sgi, IRQ_TYPE_NONE);
554
555 return 0;
556 }
557
xlnx_event_cpuhp_down(unsigned int cpu)558 static int xlnx_event_cpuhp_down(unsigned int cpu)
559 {
560 disable_percpu_irq(virq_sgi);
561
562 return 0;
563 }
564
xlnx_disable_percpu_irq(void * data)565 static void xlnx_disable_percpu_irq(void *data)
566 {
567 disable_percpu_irq(virq_sgi);
568 }
569
xlnx_event_init_sgi(struct platform_device * pdev)570 static int xlnx_event_init_sgi(struct platform_device *pdev)
571 {
572 int ret = 0;
573 /*
574 * IRQ related structures are used for the following:
575 * for each SGI interrupt ensure its mapped by GIC IRQ domain
576 * and that each corresponding linux IRQ for the HW IRQ has
577 * a handler for when receiving an interrupt from the remote
578 * processor.
579 */
580 struct irq_domain *domain;
581 struct irq_fwspec sgi_fwspec;
582 struct device_node *interrupt_parent = NULL;
583 struct device *parent = pdev->dev.parent;
584
585 /* Find GIC controller to map SGIs. */
586 interrupt_parent = of_irq_find_parent(parent->of_node);
587 if (!interrupt_parent) {
588 dev_err(&pdev->dev, "Failed to find property for Interrupt parent\n");
589 return -EINVAL;
590 }
591
592 /* Each SGI needs to be associated with GIC's IRQ domain. */
593 domain = irq_find_host(interrupt_parent);
594 of_node_put(interrupt_parent);
595
596 /* Each mapping needs GIC domain when finding IRQ mapping. */
597 sgi_fwspec.fwnode = domain->fwnode;
598
599 /*
600 * When irq domain looks at mapping each arg is as follows:
601 * 3 args for: interrupt type (SGI), interrupt # (set later), type
602 */
603 sgi_fwspec.param_count = 1;
604
605 /* Set SGI's hwirq */
606 sgi_fwspec.param[0] = sgi_num;
607 virq_sgi = irq_create_fwspec_mapping(&sgi_fwspec);
608
609 ret = request_percpu_irq(virq_sgi, xlnx_event_handler, "xlnx_event_mgmt",
610 &dummy_cpu_number);
611
612 WARN_ON(ret);
613 if (ret) {
614 irq_dispose_mapping(virq_sgi);
615 return ret;
616 }
617
618 irq_to_desc(virq_sgi);
619 irq_set_status_flags(virq_sgi, IRQ_PER_CPU);
620
621 return ret;
622 }
623
xlnx_event_cleanup_sgi(struct platform_device * pdev)624 static void xlnx_event_cleanup_sgi(struct platform_device *pdev)
625 {
626 cpuhp_remove_state(CPUHP_AP_ONLINE_DYN);
627
628 on_each_cpu(xlnx_disable_percpu_irq, NULL, 1);
629
630 irq_clear_status_flags(virq_sgi, IRQ_PER_CPU);
631 free_percpu_irq(virq_sgi, &dummy_cpu_number);
632 irq_dispose_mapping(virq_sgi);
633 }
634
xlnx_event_manager_probe(struct platform_device * pdev)635 static int xlnx_event_manager_probe(struct platform_device *pdev)
636 {
637 int ret;
638
639 ret = zynqmp_pm_feature(PM_REGISTER_NOTIFIER);
640 if (ret < 0) {
641 dev_err(&pdev->dev, "Feature check failed with %d\n", ret);
642 return ret;
643 }
644
645 if ((ret & FIRMWARE_VERSION_MASK) <
646 REGISTER_NOTIFIER_FIRMWARE_VERSION) {
647 dev_err(&pdev->dev, "Register notifier version error. Expected Firmware: v%d - Found: v%d\n",
648 REGISTER_NOTIFIER_FIRMWARE_VERSION,
649 ret & FIRMWARE_VERSION_MASK);
650 return -EOPNOTSUPP;
651 }
652
653 /* Initialize the SGI */
654 ret = xlnx_event_init_sgi(pdev);
655 if (ret) {
656 dev_err(&pdev->dev, "SGI Init has been failed with %d\n", ret);
657 return ret;
658 }
659
660 /* Setup function for the CPU hot-plug cases */
661 cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "soc/event:starting",
662 xlnx_event_cpuhp_start, xlnx_event_cpuhp_down);
663
664 ret = zynqmp_pm_register_sgi(sgi_num, 0);
665 if (ret) {
666 if (ret == -EOPNOTSUPP)
667 dev_err(&pdev->dev, "SGI registration not supported by TF-A or Xen\n");
668 else
669 dev_err(&pdev->dev, "SGI %d registration failed, err %d\n", sgi_num, ret);
670
671 xlnx_event_cleanup_sgi(pdev);
672 return ret;
673 }
674
675 event_manager_availability = 0;
676
677 dev_info(&pdev->dev, "SGI %d Registered over TF-A\n", sgi_num);
678 dev_info(&pdev->dev, "Xilinx Event Management driver probed\n");
679
680 return ret;
681 }
682
xlnx_event_manager_remove(struct platform_device * pdev)683 static void xlnx_event_manager_remove(struct platform_device *pdev)
684 {
685 int i;
686 struct registered_event_data *eve_data;
687 struct hlist_node *tmp;
688 int ret;
689 struct agent_cb *cb_pos;
690 struct agent_cb *cb_next;
691
692 hash_for_each_safe(reg_driver_map, i, tmp, eve_data, hentry) {
693 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) {
694 list_del_init(&cb_pos->list);
695 kfree(cb_pos);
696 }
697 hash_del(&eve_data->hentry);
698 kfree(eve_data);
699 }
700
701 ret = zynqmp_pm_register_sgi(0, 1);
702 if (ret)
703 dev_err(&pdev->dev, "SGI unregistration over TF-A failed with %d\n", ret);
704
705 xlnx_event_cleanup_sgi(pdev);
706
707 event_manager_availability = -EACCES;
708 }
709
710 static struct platform_driver xlnx_event_manager_driver = {
711 .probe = xlnx_event_manager_probe,
712 .remove_new = xlnx_event_manager_remove,
713 .driver = {
714 .name = "xlnx_event_manager",
715 },
716 };
717 module_param(sgi_num, uint, 0);
718 module_platform_driver(xlnx_event_manager_driver);
719