1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Texas Instruments' K3 Interrupt Aggregator irqchip driver |
4 | * |
5 | * Copyright (C) 2018-2019 Texas Instruments Incorporated - https://www.ti.com/ |
6 | * Lokesh Vutla <lokeshvutla@ti.com> |
7 | */ |
8 | |
9 | #include <linux/err.h> |
10 | #include <linux/io.h> |
11 | #include <linux/irq.h> |
12 | #include <linux/irqchip.h> |
13 | #include <linux/irqdomain.h> |
14 | #include <linux/interrupt.h> |
15 | #include <linux/msi.h> |
16 | #include <linux/module.h> |
17 | #include <linux/moduleparam.h> |
18 | #include <linux/of.h> |
19 | #include <linux/of_irq.h> |
20 | #include <linux/platform_device.h> |
21 | #include <linux/irqchip/chained_irq.h> |
22 | #include <linux/soc/ti/ti_sci_inta_msi.h> |
23 | #include <linux/soc/ti/ti_sci_protocol.h> |
24 | #include <asm-generic/msi.h> |
25 | |
26 | #define TI_SCI_DEV_ID_MASK 0xffff |
27 | #define TI_SCI_DEV_ID_SHIFT 16 |
28 | #define TI_SCI_IRQ_ID_MASK 0xffff |
29 | #define TI_SCI_IRQ_ID_SHIFT 0 |
30 | #define HWIRQ_TO_DEVID(hwirq) (((hwirq) >> (TI_SCI_DEV_ID_SHIFT)) & \ |
31 | (TI_SCI_DEV_ID_MASK)) |
32 | #define HWIRQ_TO_IRQID(hwirq) ((hwirq) & (TI_SCI_IRQ_ID_MASK)) |
33 | #define TO_HWIRQ(dev, index) ((((dev) & TI_SCI_DEV_ID_MASK) << \ |
34 | TI_SCI_DEV_ID_SHIFT) | \ |
35 | ((index) & TI_SCI_IRQ_ID_MASK)) |
36 | |
37 | #define MAX_EVENTS_PER_VINT 64 |
38 | #define VINT_ENABLE_SET_OFFSET 0x0 |
39 | #define VINT_ENABLE_CLR_OFFSET 0x8 |
40 | #define VINT_STATUS_OFFSET 0x18 |
41 | #define VINT_STATUS_MASKED_OFFSET 0x20 |
42 | |
43 | /** |
44 | * struct ti_sci_inta_event_desc - Description of an event coming to |
45 | * Interrupt Aggregator. This serves |
46 | * as a mapping table for global event, |
47 | * hwirq and vint bit. |
48 | * @global_event: Global event number corresponding to this event |
49 | * @hwirq: Hwirq of the incoming interrupt |
50 | * @vint_bit: Corresponding vint bit to which this event is attached. |
51 | */ |
52 | struct ti_sci_inta_event_desc { |
53 | u16 global_event; |
54 | u32 hwirq; |
55 | u8 vint_bit; |
56 | }; |
57 | |
58 | /** |
59 | * struct ti_sci_inta_vint_desc - Description of a virtual interrupt coming out |
60 | * of Interrupt Aggregator. |
61 | * @domain: Pointer to IRQ domain to which this vint belongs. |
62 | * @list: List entry for the vint list |
63 | * @event_map: Bitmap to manage the allocation of events to vint. |
64 | * @events: Array of event descriptors assigned to this vint. |
65 | * @parent_virq: Linux IRQ number that gets attached to parent |
66 | * @vint_id: TISCI vint ID |
67 | */ |
68 | struct ti_sci_inta_vint_desc { |
69 | struct irq_domain *domain; |
70 | struct list_head list; |
71 | DECLARE_BITMAP(event_map, MAX_EVENTS_PER_VINT); |
72 | struct ti_sci_inta_event_desc events[MAX_EVENTS_PER_VINT]; |
73 | unsigned int parent_virq; |
74 | u16 vint_id; |
75 | }; |
76 | |
77 | /** |
78 | * struct ti_sci_inta_irq_domain - Structure representing a TISCI based |
79 | * Interrupt Aggregator IRQ domain. |
80 | * @sci: Pointer to TISCI handle |
81 | * @vint: TISCI resource pointer representing IA interrupts. |
82 | * @global_event: TISCI resource pointer representing global events. |
83 | * @vint_list: List of the vints active in the system |
84 | * @vint_mutex: Mutex to protect vint_list |
85 | * @base: Base address of the memory mapped IO registers |
86 | * @pdev: Pointer to platform device. |
87 | * @ti_sci_id: TI-SCI device identifier |
88 | * @unmapped_cnt: Number of @unmapped_dev_ids entries |
89 | * @unmapped_dev_ids: Pointer to an array of TI-SCI device identifiers of |
90 | * unmapped event sources. |
91 | * Unmapped Events are not part of the Global Event Map and |
92 | * they are converted to Global event within INTA to be |
93 | * received by the same INTA to generate an interrupt. |
94 | * In case an interrupt request comes for a device which is |
95 | * generating Unmapped Event, we must use the INTA's TI-SCI |
96 | * device identifier in place of the source device |
97 | * identifier to let sysfw know where it has to program the |
98 | * Global Event number. |
99 | */ |
100 | struct ti_sci_inta_irq_domain { |
101 | const struct ti_sci_handle *sci; |
102 | struct ti_sci_resource *vint; |
103 | struct ti_sci_resource *global_event; |
104 | struct list_head vint_list; |
105 | /* Mutex to protect vint list */ |
106 | struct mutex vint_mutex; |
107 | void __iomem *base; |
108 | struct platform_device *pdev; |
109 | u32 ti_sci_id; |
110 | |
111 | int unmapped_cnt; |
112 | u16 *unmapped_dev_ids; |
113 | }; |
114 | |
115 | #define to_vint_desc(e, i) container_of(e, struct ti_sci_inta_vint_desc, \ |
116 | events[i]) |
117 | |
118 | static u16 ti_sci_inta_get_dev_id(struct ti_sci_inta_irq_domain *inta, u32 hwirq) |
119 | { |
120 | u16 dev_id = HWIRQ_TO_DEVID(hwirq); |
121 | int i; |
122 | |
123 | if (inta->unmapped_cnt == 0) |
124 | return dev_id; |
125 | |
126 | /* |
127 | * For devices sending Unmapped Events we must use the INTA's TI-SCI |
128 | * device identifier number to be able to convert it to a Global Event |
129 | * and map it to an interrupt. |
130 | */ |
131 | for (i = 0; i < inta->unmapped_cnt; i++) { |
132 | if (dev_id == inta->unmapped_dev_ids[i]) { |
133 | dev_id = inta->ti_sci_id; |
134 | break; |
135 | } |
136 | } |
137 | |
138 | return dev_id; |
139 | } |
140 | |
141 | /** |
142 | * ti_sci_inta_irq_handler() - Chained IRQ handler for the vint irqs |
143 | * @desc: Pointer to irq_desc corresponding to the irq |
144 | */ |
145 | static void ti_sci_inta_irq_handler(struct irq_desc *desc) |
146 | { |
147 | struct ti_sci_inta_vint_desc *vint_desc; |
148 | struct ti_sci_inta_irq_domain *inta; |
149 | struct irq_domain *domain; |
150 | unsigned int bit; |
151 | unsigned long val; |
152 | |
153 | vint_desc = irq_desc_get_handler_data(desc); |
154 | domain = vint_desc->domain; |
155 | inta = domain->host_data; |
156 | |
157 | chained_irq_enter(chip: irq_desc_get_chip(desc), desc); |
158 | |
159 | val = readq_relaxed(inta->base + vint_desc->vint_id * 0x1000 + |
160 | VINT_STATUS_MASKED_OFFSET); |
161 | |
162 | for_each_set_bit(bit, &val, MAX_EVENTS_PER_VINT) |
163 | generic_handle_domain_irq(domain, hwirq: vint_desc->events[bit].hwirq); |
164 | |
165 | chained_irq_exit(chip: irq_desc_get_chip(desc), desc); |
166 | } |
167 | |
168 | /** |
169 | * ti_sci_inta_xlate_irq() - Translate hwirq to parent's hwirq. |
170 | * @inta: IRQ domain corresponding to Interrupt Aggregator |
171 | * @vint_id: Hardware irq corresponding to the above irq domain |
172 | * |
173 | * Return parent irq number if translation is available else -ENOENT. |
174 | */ |
175 | static int ti_sci_inta_xlate_irq(struct ti_sci_inta_irq_domain *inta, |
176 | u16 vint_id) |
177 | { |
178 | struct device_node *np = dev_of_node(dev: &inta->pdev->dev); |
179 | u32 base, parent_base, size; |
180 | const __be32 *range; |
181 | int len; |
182 | |
183 | range = of_get_property(node: np, name: "ti,interrupt-ranges" , lenp: &len); |
184 | if (!range) |
185 | return vint_id; |
186 | |
187 | for (len /= sizeof(*range); len >= 3; len -= 3) { |
188 | base = be32_to_cpu(*range++); |
189 | parent_base = be32_to_cpu(*range++); |
190 | size = be32_to_cpu(*range++); |
191 | |
192 | if (base <= vint_id && vint_id < base + size) |
193 | return vint_id - base + parent_base; |
194 | } |
195 | |
196 | return -ENOENT; |
197 | } |
198 | |
199 | /** |
200 | * ti_sci_inta_alloc_parent_irq() - Allocate parent irq to Interrupt aggregator |
201 | * @domain: IRQ domain corresponding to Interrupt Aggregator |
202 | * |
203 | * Return 0 if all went well else corresponding error value. |
204 | */ |
205 | static struct ti_sci_inta_vint_desc *ti_sci_inta_alloc_parent_irq(struct irq_domain *domain) |
206 | { |
207 | struct ti_sci_inta_irq_domain *inta = domain->host_data; |
208 | struct ti_sci_inta_vint_desc *vint_desc; |
209 | struct irq_fwspec parent_fwspec; |
210 | struct device_node *parent_node; |
211 | unsigned int parent_virq; |
212 | int p_hwirq, ret; |
213 | u16 vint_id; |
214 | |
215 | vint_id = ti_sci_get_free_resource(res: inta->vint); |
216 | if (vint_id == TI_SCI_RESOURCE_NULL) |
217 | return ERR_PTR(error: -EINVAL); |
218 | |
219 | p_hwirq = ti_sci_inta_xlate_irq(inta, vint_id); |
220 | if (p_hwirq < 0) { |
221 | ret = p_hwirq; |
222 | goto free_vint; |
223 | } |
224 | |
225 | vint_desc = kzalloc(size: sizeof(*vint_desc), GFP_KERNEL); |
226 | if (!vint_desc) { |
227 | ret = -ENOMEM; |
228 | goto free_vint; |
229 | } |
230 | |
231 | vint_desc->domain = domain; |
232 | vint_desc->vint_id = vint_id; |
233 | INIT_LIST_HEAD(list: &vint_desc->list); |
234 | |
235 | parent_node = of_irq_find_parent(child: dev_of_node(dev: &inta->pdev->dev)); |
236 | parent_fwspec.fwnode = of_node_to_fwnode(node: parent_node); |
237 | |
238 | if (of_device_is_compatible(device: parent_node, "arm,gic-v3" )) { |
239 | /* Parent is GIC */ |
240 | parent_fwspec.param_count = 3; |
241 | parent_fwspec.param[0] = 0; |
242 | parent_fwspec.param[1] = p_hwirq - 32; |
243 | parent_fwspec.param[2] = IRQ_TYPE_LEVEL_HIGH; |
244 | } else { |
245 | /* Parent is Interrupt Router */ |
246 | parent_fwspec.param_count = 1; |
247 | parent_fwspec.param[0] = p_hwirq; |
248 | } |
249 | |
250 | parent_virq = irq_create_fwspec_mapping(fwspec: &parent_fwspec); |
251 | if (parent_virq == 0) { |
252 | dev_err(&inta->pdev->dev, "Parent IRQ allocation failed\n" ); |
253 | ret = -EINVAL; |
254 | goto free_vint_desc; |
255 | |
256 | } |
257 | vint_desc->parent_virq = parent_virq; |
258 | |
259 | list_add_tail(new: &vint_desc->list, head: &inta->vint_list); |
260 | irq_set_chained_handler_and_data(irq: vint_desc->parent_virq, |
261 | handle: ti_sci_inta_irq_handler, data: vint_desc); |
262 | |
263 | return vint_desc; |
264 | free_vint_desc: |
265 | kfree(objp: vint_desc); |
266 | free_vint: |
267 | ti_sci_release_resource(res: inta->vint, id: vint_id); |
268 | return ERR_PTR(error: ret); |
269 | } |
270 | |
271 | /** |
272 | * ti_sci_inta_alloc_event() - Attach an event to a IA vint. |
273 | * @vint_desc: Pointer to vint_desc to which the event gets attached |
274 | * @free_bit: Bit inside vint to which event gets attached |
275 | * @hwirq: hwirq of the input event |
276 | * |
277 | * Return event_desc pointer if all went ok else appropriate error value. |
278 | */ |
279 | static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_event(struct ti_sci_inta_vint_desc *vint_desc, |
280 | u16 free_bit, |
281 | u32 hwirq) |
282 | { |
283 | struct ti_sci_inta_irq_domain *inta = vint_desc->domain->host_data; |
284 | struct ti_sci_inta_event_desc *event_desc; |
285 | u16 dev_id, dev_index; |
286 | int err; |
287 | |
288 | dev_id = ti_sci_inta_get_dev_id(inta, hwirq); |
289 | dev_index = HWIRQ_TO_IRQID(hwirq); |
290 | |
291 | event_desc = &vint_desc->events[free_bit]; |
292 | event_desc->hwirq = hwirq; |
293 | event_desc->vint_bit = free_bit; |
294 | event_desc->global_event = ti_sci_get_free_resource(res: inta->global_event); |
295 | if (event_desc->global_event == TI_SCI_RESOURCE_NULL) |
296 | return ERR_PTR(error: -EINVAL); |
297 | |
298 | err = inta->sci->ops.rm_irq_ops.set_event_map(inta->sci, |
299 | dev_id, dev_index, |
300 | inta->ti_sci_id, |
301 | vint_desc->vint_id, |
302 | event_desc->global_event, |
303 | free_bit); |
304 | if (err) |
305 | goto free_global_event; |
306 | |
307 | return event_desc; |
308 | free_global_event: |
309 | ti_sci_release_resource(res: inta->global_event, id: event_desc->global_event); |
310 | return ERR_PTR(error: err); |
311 | } |
312 | |
313 | /** |
314 | * ti_sci_inta_alloc_irq() - Allocate an irq within INTA domain |
315 | * @domain: irq_domain pointer corresponding to INTA |
316 | * @hwirq: hwirq of the input event |
317 | * |
318 | * Note: Allocation happens in the following manner: |
319 | * - Find a free bit available in any of the vints available in the list. |
320 | * - If not found, allocate a vint from the vint pool |
321 | * - Attach the free bit to input hwirq. |
322 | * Return event_desc if all went ok else appropriate error value. |
323 | */ |
324 | static struct ti_sci_inta_event_desc *ti_sci_inta_alloc_irq(struct irq_domain *domain, |
325 | u32 hwirq) |
326 | { |
327 | struct ti_sci_inta_irq_domain *inta = domain->host_data; |
328 | struct ti_sci_inta_vint_desc *vint_desc = NULL; |
329 | struct ti_sci_inta_event_desc *event_desc; |
330 | u16 free_bit; |
331 | |
332 | mutex_lock(&inta->vint_mutex); |
333 | list_for_each_entry(vint_desc, &inta->vint_list, list) { |
334 | free_bit = find_first_zero_bit(addr: vint_desc->event_map, |
335 | MAX_EVENTS_PER_VINT); |
336 | if (free_bit != MAX_EVENTS_PER_VINT) { |
337 | set_bit(nr: free_bit, addr: vint_desc->event_map); |
338 | goto alloc_event; |
339 | } |
340 | } |
341 | |
342 | /* No free bits available. Allocate a new vint */ |
343 | vint_desc = ti_sci_inta_alloc_parent_irq(domain); |
344 | if (IS_ERR(ptr: vint_desc)) { |
345 | event_desc = ERR_CAST(ptr: vint_desc); |
346 | goto unlock; |
347 | } |
348 | |
349 | free_bit = find_first_zero_bit(addr: vint_desc->event_map, |
350 | MAX_EVENTS_PER_VINT); |
351 | set_bit(nr: free_bit, addr: vint_desc->event_map); |
352 | |
353 | alloc_event: |
354 | event_desc = ti_sci_inta_alloc_event(vint_desc, free_bit, hwirq); |
355 | if (IS_ERR(ptr: event_desc)) |
356 | clear_bit(nr: free_bit, addr: vint_desc->event_map); |
357 | |
358 | unlock: |
359 | mutex_unlock(lock: &inta->vint_mutex); |
360 | return event_desc; |
361 | } |
362 | |
363 | /** |
364 | * ti_sci_inta_free_parent_irq() - Free a parent irq to INTA |
365 | * @inta: Pointer to inta domain. |
366 | * @vint_desc: Pointer to vint_desc that needs to be freed. |
367 | */ |
368 | static void ti_sci_inta_free_parent_irq(struct ti_sci_inta_irq_domain *inta, |
369 | struct ti_sci_inta_vint_desc *vint_desc) |
370 | { |
371 | if (find_first_bit(addr: vint_desc->event_map, MAX_EVENTS_PER_VINT) == MAX_EVENTS_PER_VINT) { |
372 | list_del(entry: &vint_desc->list); |
373 | ti_sci_release_resource(res: inta->vint, id: vint_desc->vint_id); |
374 | irq_dispose_mapping(virq: vint_desc->parent_virq); |
375 | kfree(objp: vint_desc); |
376 | } |
377 | } |
378 | |
379 | /** |
380 | * ti_sci_inta_free_irq() - Free an IRQ within INTA domain |
381 | * @event_desc: Pointer to event_desc that needs to be freed. |
382 | * @hwirq: Hwirq number within INTA domain that needs to be freed |
383 | */ |
384 | static void ti_sci_inta_free_irq(struct ti_sci_inta_event_desc *event_desc, |
385 | u32 hwirq) |
386 | { |
387 | struct ti_sci_inta_vint_desc *vint_desc; |
388 | struct ti_sci_inta_irq_domain *inta; |
389 | u16 dev_id; |
390 | |
391 | vint_desc = to_vint_desc(event_desc, event_desc->vint_bit); |
392 | inta = vint_desc->domain->host_data; |
393 | dev_id = ti_sci_inta_get_dev_id(inta, hwirq); |
394 | /* free event irq */ |
395 | mutex_lock(&inta->vint_mutex); |
396 | inta->sci->ops.rm_irq_ops.free_event_map(inta->sci, |
397 | dev_id, HWIRQ_TO_IRQID(hwirq), |
398 | inta->ti_sci_id, |
399 | vint_desc->vint_id, |
400 | event_desc->global_event, |
401 | event_desc->vint_bit); |
402 | |
403 | clear_bit(nr: event_desc->vint_bit, addr: vint_desc->event_map); |
404 | ti_sci_release_resource(res: inta->global_event, id: event_desc->global_event); |
405 | event_desc->global_event = TI_SCI_RESOURCE_NULL; |
406 | event_desc->hwirq = 0; |
407 | |
408 | ti_sci_inta_free_parent_irq(inta, vint_desc); |
409 | mutex_unlock(lock: &inta->vint_mutex); |
410 | } |
411 | |
412 | /** |
413 | * ti_sci_inta_request_resources() - Allocate resources for input irq |
414 | * @data: Pointer to corresponding irq_data |
415 | * |
416 | * Note: This is the core api where the actual allocation happens for input |
417 | * hwirq. This allocation involves creating a parent irq for vint. |
418 | * If this is done in irq_domain_ops.alloc() then a deadlock is reached |
419 | * for allocation. So this allocation is being done in request_resources() |
420 | * |
421 | * Return: 0 if all went well else corresponding error. |
422 | */ |
423 | static int ti_sci_inta_request_resources(struct irq_data *data) |
424 | { |
425 | struct ti_sci_inta_event_desc *event_desc; |
426 | |
427 | event_desc = ti_sci_inta_alloc_irq(domain: data->domain, hwirq: data->hwirq); |
428 | if (IS_ERR(ptr: event_desc)) |
429 | return PTR_ERR(ptr: event_desc); |
430 | |
431 | data->chip_data = event_desc; |
432 | |
433 | return 0; |
434 | } |
435 | |
436 | /** |
437 | * ti_sci_inta_release_resources - Release resources for input irq |
438 | * @data: Pointer to corresponding irq_data |
439 | * |
440 | * Note: Corresponding to request_resources(), all the unmapping and deletion |
441 | * of parent vint irqs happens in this api. |
442 | */ |
443 | static void ti_sci_inta_release_resources(struct irq_data *data) |
444 | { |
445 | struct ti_sci_inta_event_desc *event_desc; |
446 | |
447 | event_desc = irq_data_get_irq_chip_data(d: data); |
448 | ti_sci_inta_free_irq(event_desc, hwirq: data->hwirq); |
449 | } |
450 | |
451 | /** |
452 | * ti_sci_inta_manage_event() - Control the event based on the offset |
453 | * @data: Pointer to corresponding irq_data |
454 | * @offset: register offset using which event is controlled. |
455 | */ |
456 | static void ti_sci_inta_manage_event(struct irq_data *data, u32 offset) |
457 | { |
458 | struct ti_sci_inta_event_desc *event_desc; |
459 | struct ti_sci_inta_vint_desc *vint_desc; |
460 | struct ti_sci_inta_irq_domain *inta; |
461 | |
462 | event_desc = irq_data_get_irq_chip_data(d: data); |
463 | vint_desc = to_vint_desc(event_desc, event_desc->vint_bit); |
464 | inta = data->domain->host_data; |
465 | |
466 | writeq_relaxed(BIT(event_desc->vint_bit), |
467 | inta->base + vint_desc->vint_id * 0x1000 + offset); |
468 | } |
469 | |
470 | /** |
471 | * ti_sci_inta_mask_irq() - Mask an event |
472 | * @data: Pointer to corresponding irq_data |
473 | */ |
474 | static void ti_sci_inta_mask_irq(struct irq_data *data) |
475 | { |
476 | ti_sci_inta_manage_event(data, VINT_ENABLE_CLR_OFFSET); |
477 | } |
478 | |
479 | /** |
480 | * ti_sci_inta_unmask_irq() - Unmask an event |
481 | * @data: Pointer to corresponding irq_data |
482 | */ |
483 | static void ti_sci_inta_unmask_irq(struct irq_data *data) |
484 | { |
485 | ti_sci_inta_manage_event(data, VINT_ENABLE_SET_OFFSET); |
486 | } |
487 | |
488 | /** |
489 | * ti_sci_inta_ack_irq() - Ack an event |
490 | * @data: Pointer to corresponding irq_data |
491 | */ |
492 | static void ti_sci_inta_ack_irq(struct irq_data *data) |
493 | { |
494 | /* |
495 | * Do not clear the event if hardware is capable of sending |
496 | * a down event. |
497 | */ |
498 | if (irqd_get_trigger_type(d: data) != IRQF_TRIGGER_HIGH) |
499 | ti_sci_inta_manage_event(data, VINT_STATUS_OFFSET); |
500 | } |
501 | |
502 | static int ti_sci_inta_set_affinity(struct irq_data *d, |
503 | const struct cpumask *mask_val, bool force) |
504 | { |
505 | return -EINVAL; |
506 | } |
507 | |
508 | /** |
509 | * ti_sci_inta_set_type() - Update the trigger type of the irq. |
510 | * @data: Pointer to corresponding irq_data |
511 | * @type: Trigger type as specified by user |
512 | * |
513 | * Note: This updates the handle_irq callback for level msi. |
514 | * |
515 | * Return 0 if all went well else appropriate error. |
516 | */ |
517 | static int ti_sci_inta_set_type(struct irq_data *data, unsigned int type) |
518 | { |
519 | /* |
520 | * .alloc default sets handle_edge_irq. But if the user specifies |
521 | * that IRQ is level MSI, then update the handle to handle_level_irq |
522 | */ |
523 | switch (type & IRQ_TYPE_SENSE_MASK) { |
524 | case IRQF_TRIGGER_HIGH: |
525 | irq_set_handler_locked(data, handler: handle_level_irq); |
526 | return 0; |
527 | case IRQF_TRIGGER_RISING: |
528 | return 0; |
529 | default: |
530 | return -EINVAL; |
531 | } |
532 | } |
533 | |
534 | static struct irq_chip ti_sci_inta_irq_chip = { |
535 | .name = "INTA" , |
536 | .irq_ack = ti_sci_inta_ack_irq, |
537 | .irq_mask = ti_sci_inta_mask_irq, |
538 | .irq_set_type = ti_sci_inta_set_type, |
539 | .irq_unmask = ti_sci_inta_unmask_irq, |
540 | .irq_set_affinity = ti_sci_inta_set_affinity, |
541 | .irq_request_resources = ti_sci_inta_request_resources, |
542 | .irq_release_resources = ti_sci_inta_release_resources, |
543 | }; |
544 | |
545 | /** |
546 | * ti_sci_inta_irq_domain_free() - Free an IRQ from the IRQ domain |
547 | * @domain: Domain to which the irqs belong |
548 | * @virq: base linux virtual IRQ to be freed. |
549 | * @nr_irqs: Number of continuous irqs to be freed |
550 | */ |
551 | static void ti_sci_inta_irq_domain_free(struct irq_domain *domain, |
552 | unsigned int virq, unsigned int nr_irqs) |
553 | { |
554 | struct irq_data *data = irq_domain_get_irq_data(domain, virq); |
555 | |
556 | irq_domain_reset_irq_data(irq_data: data); |
557 | } |
558 | |
559 | /** |
560 | * ti_sci_inta_irq_domain_alloc() - Allocate Interrupt aggregator IRQs |
561 | * @domain: Point to the interrupt aggregator IRQ domain |
562 | * @virq: Corresponding Linux virtual IRQ number |
563 | * @nr_irqs: Continuous irqs to be allocated |
564 | * @data: Pointer to firmware specifier |
565 | * |
566 | * No actual allocation happens here. |
567 | * |
568 | * Return 0 if all went well else appropriate error value. |
569 | */ |
570 | static int ti_sci_inta_irq_domain_alloc(struct irq_domain *domain, |
571 | unsigned int virq, unsigned int nr_irqs, |
572 | void *data) |
573 | { |
574 | msi_alloc_info_t *arg = data; |
575 | |
576 | irq_domain_set_info(domain, virq, hwirq: arg->hwirq, chip: &ti_sci_inta_irq_chip, |
577 | NULL, handler: handle_edge_irq, NULL, NULL); |
578 | |
579 | return 0; |
580 | } |
581 | |
582 | static const struct irq_domain_ops ti_sci_inta_irq_domain_ops = { |
583 | .free = ti_sci_inta_irq_domain_free, |
584 | .alloc = ti_sci_inta_irq_domain_alloc, |
585 | }; |
586 | |
587 | static struct irq_chip ti_sci_inta_msi_irq_chip = { |
588 | .name = "MSI-INTA" , |
589 | .flags = IRQCHIP_SUPPORTS_LEVEL_MSI, |
590 | }; |
591 | |
592 | static void ti_sci_inta_msi_set_desc(msi_alloc_info_t *arg, |
593 | struct msi_desc *desc) |
594 | { |
595 | struct platform_device *pdev = to_platform_device(desc->dev); |
596 | |
597 | arg->desc = desc; |
598 | arg->hwirq = TO_HWIRQ(pdev->id, desc->msi_index); |
599 | } |
600 | |
601 | static struct msi_domain_ops ti_sci_inta_msi_ops = { |
602 | .set_desc = ti_sci_inta_msi_set_desc, |
603 | }; |
604 | |
605 | static struct msi_domain_info ti_sci_inta_msi_domain_info = { |
606 | .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | |
607 | MSI_FLAG_LEVEL_CAPABLE), |
608 | .ops = &ti_sci_inta_msi_ops, |
609 | .chip = &ti_sci_inta_msi_irq_chip, |
610 | }; |
611 | |
612 | static int ti_sci_inta_get_unmapped_sources(struct ti_sci_inta_irq_domain *inta) |
613 | { |
614 | struct device *dev = &inta->pdev->dev; |
615 | struct device_node *node = dev_of_node(dev); |
616 | struct of_phandle_iterator it; |
617 | int count, err, ret, i; |
618 | |
619 | count = of_count_phandle_with_args(np: node, list_name: "ti,unmapped-event-sources" , NULL); |
620 | if (count <= 0) |
621 | return 0; |
622 | |
623 | inta->unmapped_dev_ids = devm_kcalloc(dev, n: count, |
624 | size: sizeof(*inta->unmapped_dev_ids), |
625 | GFP_KERNEL); |
626 | if (!inta->unmapped_dev_ids) |
627 | return -ENOMEM; |
628 | |
629 | i = 0; |
630 | of_for_each_phandle(&it, err, node, "ti,unmapped-event-sources" , NULL, 0) { |
631 | u32 dev_id; |
632 | |
633 | ret = of_property_read_u32(np: it.node, propname: "ti,sci-dev-id" , out_value: &dev_id); |
634 | if (ret) { |
635 | dev_err(dev, "ti,sci-dev-id read failure for %pOFf\n" , it.node); |
636 | of_node_put(node: it.node); |
637 | return ret; |
638 | } |
639 | inta->unmapped_dev_ids[i++] = dev_id; |
640 | } |
641 | |
642 | inta->unmapped_cnt = count; |
643 | |
644 | return 0; |
645 | } |
646 | |
647 | static int ti_sci_inta_irq_domain_probe(struct platform_device *pdev) |
648 | { |
649 | struct irq_domain *parent_domain, *domain, *msi_domain; |
650 | struct device_node *parent_node, *node; |
651 | struct ti_sci_inta_irq_domain *inta; |
652 | struct device *dev = &pdev->dev; |
653 | int ret; |
654 | |
655 | node = dev_of_node(dev); |
656 | parent_node = of_irq_find_parent(child: node); |
657 | if (!parent_node) { |
658 | dev_err(dev, "Failed to get IRQ parent node\n" ); |
659 | return -ENODEV; |
660 | } |
661 | |
662 | parent_domain = irq_find_host(node: parent_node); |
663 | if (!parent_domain) |
664 | return -EPROBE_DEFER; |
665 | |
666 | inta = devm_kzalloc(dev, size: sizeof(*inta), GFP_KERNEL); |
667 | if (!inta) |
668 | return -ENOMEM; |
669 | |
670 | inta->pdev = pdev; |
671 | inta->sci = devm_ti_sci_get_by_phandle(dev, property: "ti,sci" ); |
672 | if (IS_ERR(ptr: inta->sci)) |
673 | return dev_err_probe(dev, err: PTR_ERR(ptr: inta->sci), |
674 | fmt: "ti,sci read fail\n" ); |
675 | |
676 | ret = of_property_read_u32(np: dev->of_node, propname: "ti,sci-dev-id" , out_value: &inta->ti_sci_id); |
677 | if (ret) { |
678 | dev_err(dev, "missing 'ti,sci-dev-id' property\n" ); |
679 | return -EINVAL; |
680 | } |
681 | |
682 | inta->vint = devm_ti_sci_get_resource(handle: inta->sci, dev, dev_id: inta->ti_sci_id, |
683 | TI_SCI_RESASG_SUBTYPE_IA_VINT); |
684 | if (IS_ERR(ptr: inta->vint)) { |
685 | dev_err(dev, "VINT resource allocation failed\n" ); |
686 | return PTR_ERR(ptr: inta->vint); |
687 | } |
688 | |
689 | inta->global_event = devm_ti_sci_get_resource(handle: inta->sci, dev, dev_id: inta->ti_sci_id, |
690 | TI_SCI_RESASG_SUBTYPE_GLOBAL_EVENT_SEVT); |
691 | if (IS_ERR(ptr: inta->global_event)) { |
692 | dev_err(dev, "Global event resource allocation failed\n" ); |
693 | return PTR_ERR(ptr: inta->global_event); |
694 | } |
695 | |
696 | inta->base = devm_platform_ioremap_resource(pdev, index: 0); |
697 | if (IS_ERR(ptr: inta->base)) |
698 | return PTR_ERR(ptr: inta->base); |
699 | |
700 | ret = ti_sci_inta_get_unmapped_sources(inta); |
701 | if (ret) |
702 | return ret; |
703 | |
704 | domain = irq_domain_add_linear(of_node: dev_of_node(dev), |
705 | size: ti_sci_get_num_resources(res: inta->vint), |
706 | ops: &ti_sci_inta_irq_domain_ops, host_data: inta); |
707 | if (!domain) { |
708 | dev_err(dev, "Failed to allocate IRQ domain\n" ); |
709 | return -ENOMEM; |
710 | } |
711 | |
712 | msi_domain = ti_sci_inta_msi_create_irq_domain(fwnode: of_node_to_fwnode(node), |
713 | info: &ti_sci_inta_msi_domain_info, |
714 | parent: domain); |
715 | if (!msi_domain) { |
716 | irq_domain_remove(host: domain); |
717 | dev_err(dev, "Failed to allocate msi domain\n" ); |
718 | return -ENOMEM; |
719 | } |
720 | |
721 | INIT_LIST_HEAD(list: &inta->vint_list); |
722 | mutex_init(&inta->vint_mutex); |
723 | |
724 | dev_info(dev, "Interrupt Aggregator domain %d created\n" , inta->ti_sci_id); |
725 | |
726 | return 0; |
727 | } |
728 | |
729 | static const struct of_device_id ti_sci_inta_irq_domain_of_match[] = { |
730 | { .compatible = "ti,sci-inta" , }, |
731 | { /* sentinel */ }, |
732 | }; |
733 | MODULE_DEVICE_TABLE(of, ti_sci_inta_irq_domain_of_match); |
734 | |
735 | static struct platform_driver ti_sci_inta_irq_domain_driver = { |
736 | .probe = ti_sci_inta_irq_domain_probe, |
737 | .driver = { |
738 | .name = "ti-sci-inta" , |
739 | .of_match_table = ti_sci_inta_irq_domain_of_match, |
740 | }, |
741 | }; |
742 | module_platform_driver(ti_sci_inta_irq_domain_driver); |
743 | |
744 | MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ti.com>" ); |
745 | MODULE_DESCRIPTION("K3 Interrupt Aggregator driver over TI SCI protocol" ); |
746 | |