xref: /openbmc/linux/drivers/mailbox/tegra-hsp.c (revision d9f6e12f) 
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
4  */
5 
6 #include <linux/delay.h>
7 #include <linux/interrupt.h>
8 #include <linux/io.h>
9 #include <linux/mailbox_controller.h>
10 #include <linux/of.h>
11 #include <linux/of_device.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm.h>
14 #include <linux/slab.h>
15 
16 #include <soc/tegra/fuse.h>
17 
18 #include <dt-bindings/mailbox/tegra186-hsp.h>
19 
20 #include "mailbox.h"
21 
22 #define HSP_INT_IE(x)		(0x100 + ((x) * 4))
23 #define HSP_INT_IV		0x300
24 #define HSP_INT_IR		0x304
25 
26 #define HSP_INT_EMPTY_SHIFT	0
27 #define HSP_INT_EMPTY_MASK	0xff
28 #define HSP_INT_FULL_SHIFT	8
29 #define HSP_INT_FULL_MASK	0xff
30 
31 #define HSP_INT_DIMENSIONING	0x380
32 #define HSP_nSM_SHIFT		0
33 #define HSP_nSS_SHIFT		4
34 #define HSP_nAS_SHIFT		8
35 #define HSP_nDB_SHIFT		12
36 #define HSP_nSI_SHIFT		16
37 #define HSP_nINT_MASK		0xf
38 
39 #define HSP_DB_TRIGGER	0x0
40 #define HSP_DB_ENABLE	0x4
41 #define HSP_DB_RAW	0x8
42 #define HSP_DB_PENDING	0xc
43 
44 #define HSP_SM_SHRD_MBOX	0x0
45 #define HSP_SM_SHRD_MBOX_FULL	BIT(31)
46 #define HSP_SM_SHRD_MBOX_FULL_INT_IE	0x04
47 #define HSP_SM_SHRD_MBOX_EMPTY_INT_IE	0x08
48 
49 #define HSP_DB_CCPLEX		1
50 #define HSP_DB_BPMP		3
51 #define HSP_DB_MAX		7
52 
53 struct tegra_hsp_channel;
54 struct tegra_hsp;
55 
56 struct tegra_hsp_channel {
57 	struct tegra_hsp *hsp;
58 	struct mbox_chan *chan;
59 	void __iomem *regs;
60 };
61 
62 struct tegra_hsp_doorbell {
63 	struct tegra_hsp_channel channel;
64 	struct list_head list;
65 	const char *name;
66 	unsigned int master;
67 	unsigned int index;
68 };
69 
70 struct tegra_hsp_mailbox {
71 	struct tegra_hsp_channel channel;
72 	unsigned int index;
73 	bool producer;
74 };
75 
76 struct tegra_hsp_db_map {
77 	const char *name;
78 	unsigned int master;
79 	unsigned int index;
80 };
81 
82 struct tegra_hsp_soc {
83 	const struct tegra_hsp_db_map *map;
84 	bool has_per_mb_ie;
85 };
86 
87 struct tegra_hsp {
88 	struct device *dev;
89 	const struct tegra_hsp_soc *soc;
90 	struct mbox_controller mbox_db;
91 	struct mbox_controller mbox_sm;
92 	void __iomem *regs;
93 	unsigned int doorbell_irq;
94 	unsigned int *shared_irqs;
95 	unsigned int shared_irq;
96 	unsigned int num_sm;
97 	unsigned int num_as;
98 	unsigned int num_ss;
99 	unsigned int num_db;
100 	unsigned int num_si;
101 
102 	spinlock_t lock;
103 	struct lock_class_key lock_key;
104 
105 	struct list_head doorbells;
106 	struct tegra_hsp_mailbox *mailboxes;
107 
108 	unsigned long mask;
109 };
110 
111 static inline u32 tegra_hsp_readl(struct tegra_hsp *hsp, unsigned int offset)
112 {
113 	return readl(hsp->regs + offset);
114 }
115 
116 static inline void tegra_hsp_writel(struct tegra_hsp *hsp, u32 value,
117 				    unsigned int offset)
118 {
119 	writel(value, hsp->regs + offset);
120 }
121 
122 static inline u32 tegra_hsp_channel_readl(struct tegra_hsp_channel *channel,
123 					  unsigned int offset)
124 {
125 	return readl(channel->regs + offset);
126 }
127 
128 static inline void tegra_hsp_channel_writel(struct tegra_hsp_channel *channel,
129 					    u32 value, unsigned int offset)
130 {
131 	writel(value, channel->regs + offset);
132 }
133 
134 static bool tegra_hsp_doorbell_can_ring(struct tegra_hsp_doorbell *db)
135 {
136 	u32 value;
137 
138 	value = tegra_hsp_channel_readl(&db->channel, HSP_DB_ENABLE);
139 
140 	return (value & BIT(TEGRA_HSP_DB_MASTER_CCPLEX)) != 0;
141 }
142 
143 static struct tegra_hsp_doorbell *
144 __tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
145 {
146 	struct tegra_hsp_doorbell *entry;
147 
148 	list_for_each_entry(entry, &hsp->doorbells, list)
149 		if (entry->master == master)
150 			return entry;
151 
152 	return NULL;
153 }
154 
155 static struct tegra_hsp_doorbell *
156 tegra_hsp_doorbell_get(struct tegra_hsp *hsp, unsigned int master)
157 {
158 	struct tegra_hsp_doorbell *db;
159 	unsigned long flags;
160 
161 	spin_lock_irqsave(&hsp->lock, flags);
162 	db = __tegra_hsp_doorbell_get(hsp, master);
163 	spin_unlock_irqrestore(&hsp->lock, flags);
164 
165 	return db;
166 }
167 
168 static irqreturn_t tegra_hsp_doorbell_irq(int irq, void *data)
169 {
170 	struct tegra_hsp *hsp = data;
171 	struct tegra_hsp_doorbell *db;
172 	unsigned long master, value;
173 
174 	db = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
175 	if (!db)
176 		return IRQ_NONE;
177 
178 	value = tegra_hsp_channel_readl(&db->channel, HSP_DB_PENDING);
179 	tegra_hsp_channel_writel(&db->channel, value, HSP_DB_PENDING);
180 
181 	spin_lock(&hsp->lock);
182 
183 	for_each_set_bit(master, &value, hsp->mbox_db.num_chans) {
184 		struct tegra_hsp_doorbell *db;
185 
186 		db = __tegra_hsp_doorbell_get(hsp, master);
187 		/*
188 		 * Depending on the bootloader chain, the CCPLEX doorbell will
189 		 * have some doorbells enabled, which means that requesting an
190 		 * interrupt will immediately fire.
191 		 *
192 		 * In that case, db->channel.chan will still be NULL here and
193 		 * cause a crash if not properly guarded.
194 		 *
195 		 * It remains to be seen if ignoring the doorbell in that case
196 		 * is the correct solution.
197 		 */
198 		if (db && db->channel.chan)
199 			mbox_chan_received_data(db->channel.chan, NULL);
200 	}
201 
202 	spin_unlock(&hsp->lock);
203 
204 	return IRQ_HANDLED;
205 }
206 
207 static irqreturn_t tegra_hsp_shared_irq(int irq, void *data)
208 {
209 	struct tegra_hsp *hsp = data;
210 	unsigned long bit, mask;
211 	u32 status, value;
212 	void *msg;
213 
214 	status = tegra_hsp_readl(hsp, HSP_INT_IR) & hsp->mask;
215 
216 	/* process EMPTY interrupts first */
217 	mask = (status >> HSP_INT_EMPTY_SHIFT) & HSP_INT_EMPTY_MASK;
218 
219 	for_each_set_bit(bit, &mask, hsp->num_sm) {
220 		struct tegra_hsp_mailbox *mb = &hsp->mailboxes[bit];
221 
222 		if (mb->producer) {
223 			/*
224 			 * Disable EMPTY interrupts until data is sent with
225 			 * the next message. These interrupts are level-
226 			 * triggered, so if we kept them enabled they would
227 			 * constantly trigger until we next write data into
228 			 * the message.
229 			 */
230 			spin_lock(&hsp->lock);
231 
232 			hsp->mask &= ~BIT(HSP_INT_EMPTY_SHIFT + mb->index);
233 			tegra_hsp_writel(hsp, hsp->mask,
234 					 HSP_INT_IE(hsp->shared_irq));
235 
236 			spin_unlock(&hsp->lock);
237 
238 			mbox_chan_txdone(mb->channel.chan, 0);
239 		}
240 	}
241 
242 	/* process FULL interrupts */
243 	mask = (status >> HSP_INT_FULL_SHIFT) & HSP_INT_FULL_MASK;
244 
245 	for_each_set_bit(bit, &mask, hsp->num_sm) {
246 		struct tegra_hsp_mailbox *mb = &hsp->mailboxes[bit];
247 
248 		if (!mb->producer) {
249 			value = tegra_hsp_channel_readl(&mb->channel,
250 							HSP_SM_SHRD_MBOX);
251 			value &= ~HSP_SM_SHRD_MBOX_FULL;
252 			msg = (void *)(unsigned long)value;
253 			mbox_chan_received_data(mb->channel.chan, msg);
254 
255 			/*
256 			 * Need to clear all bits here since some producers,
257 			 * such as TCU, depend on fields in the register
258 			 * getting cleared by the consumer.
259 			 *
260 			 * The mailbox API doesn't give the consumers a way
261 			 * of doing that explicitly, so we have to make sure
262 			 * we cover all possible cases.
263 			 */
264 			tegra_hsp_channel_writel(&mb->channel, 0x0,
265 						 HSP_SM_SHRD_MBOX);
266 		}
267 	}
268 
269 	return IRQ_HANDLED;
270 }
271 
272 static struct tegra_hsp_channel *
273 tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
274 			  unsigned int master, unsigned int index)
275 {
276 	struct tegra_hsp_doorbell *db;
277 	unsigned int offset;
278 	unsigned long flags;
279 
280 	db = devm_kzalloc(hsp->dev, sizeof(*db), GFP_KERNEL);
281 	if (!db)
282 		return ERR_PTR(-ENOMEM);
283 
284 	offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) * SZ_64K;
285 	offset += index * 0x100;
286 
287 	db->channel.regs = hsp->regs + offset;
288 	db->channel.hsp = hsp;
289 
290 	db->name = devm_kstrdup_const(hsp->dev, name, GFP_KERNEL);
291 	db->master = master;
292 	db->index = index;
293 
294 	spin_lock_irqsave(&hsp->lock, flags);
295 	list_add_tail(&db->list, &hsp->doorbells);
296 	spin_unlock_irqrestore(&hsp->lock, flags);
297 
298 	return &db->channel;
299 }
300 
301 static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data)
302 {
303 	struct tegra_hsp_doorbell *db = chan->con_priv;
304 
305 	tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER);
306 
307 	return 0;
308 }
309 
310 static int tegra_hsp_doorbell_startup(struct mbox_chan *chan)
311 {
312 	struct tegra_hsp_doorbell *db = chan->con_priv;
313 	struct tegra_hsp *hsp = db->channel.hsp;
314 	struct tegra_hsp_doorbell *ccplex;
315 	unsigned long flags;
316 	u32 value;
317 
318 	if (db->master >= chan->mbox->num_chans) {
319 		dev_err(chan->mbox->dev,
320 			"invalid master ID %u for HSP channel\n",
321 			db->master);
322 		return -EINVAL;
323 	}
324 
325 	ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
326 	if (!ccplex)
327 		return -ENODEV;
328 
329 	/*
330 	 * On simulation platforms the BPMP hasn't had a chance yet to mark
331 	 * the doorbell as ringable by the CCPLEX, so we want to skip extra
332 	 * checks here.
333 	 */
334 	if (tegra_is_silicon() && !tegra_hsp_doorbell_can_ring(db))
335 		return -ENODEV;
336 
337 	spin_lock_irqsave(&hsp->lock, flags);
338 
339 	value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
340 	value |= BIT(db->master);
341 	tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
342 
343 	spin_unlock_irqrestore(&hsp->lock, flags);
344 
345 	return 0;
346 }
347 
348 static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan)
349 {
350 	struct tegra_hsp_doorbell *db = chan->con_priv;
351 	struct tegra_hsp *hsp = db->channel.hsp;
352 	struct tegra_hsp_doorbell *ccplex;
353 	unsigned long flags;
354 	u32 value;
355 
356 	ccplex = tegra_hsp_doorbell_get(hsp, TEGRA_HSP_DB_MASTER_CCPLEX);
357 	if (!ccplex)
358 		return;
359 
360 	spin_lock_irqsave(&hsp->lock, flags);
361 
362 	value = tegra_hsp_channel_readl(&ccplex->channel, HSP_DB_ENABLE);
363 	value &= ~BIT(db->master);
364 	tegra_hsp_channel_writel(&ccplex->channel, value, HSP_DB_ENABLE);
365 
366 	spin_unlock_irqrestore(&hsp->lock, flags);
367 }
368 
369 static const struct mbox_chan_ops tegra_hsp_db_ops = {
370 	.send_data = tegra_hsp_doorbell_send_data,
371 	.startup = tegra_hsp_doorbell_startup,
372 	.shutdown = tegra_hsp_doorbell_shutdown,
373 };
374 
375 static int tegra_hsp_mailbox_send_data(struct mbox_chan *chan, void *data)
376 {
377 	struct tegra_hsp_mailbox *mb = chan->con_priv;
378 	struct tegra_hsp *hsp = mb->channel.hsp;
379 	unsigned long flags;
380 	u32 value;
381 
382 	if (WARN_ON(!mb->producer))
383 		return -EPERM;
384 
385 	/* copy data and mark mailbox full */
386 	value = (u32)(unsigned long)data;
387 	value |= HSP_SM_SHRD_MBOX_FULL;
388 
389 	tegra_hsp_channel_writel(&mb->channel, value, HSP_SM_SHRD_MBOX);
390 
391 	/* enable EMPTY interrupt for the shared mailbox */
392 	spin_lock_irqsave(&hsp->lock, flags);
393 
394 	hsp->mask |= BIT(HSP_INT_EMPTY_SHIFT + mb->index);
395 	tegra_hsp_writel(hsp, hsp->mask, HSP_INT_IE(hsp->shared_irq));
396 
397 	spin_unlock_irqrestore(&hsp->lock, flags);
398 
399 	return 0;
400 }
401 
402 static int tegra_hsp_mailbox_flush(struct mbox_chan *chan,
403 				   unsigned long timeout)
404 {
405 	struct tegra_hsp_mailbox *mb = chan->con_priv;
406 	struct tegra_hsp_channel *ch = &mb->channel;
407 	u32 value;
408 
409 	timeout = jiffies + msecs_to_jiffies(timeout);
410 
411 	while (time_before(jiffies, timeout)) {
412 		value = tegra_hsp_channel_readl(ch, HSP_SM_SHRD_MBOX);
413 		if ((value & HSP_SM_SHRD_MBOX_FULL) == 0) {
414 			mbox_chan_txdone(chan, 0);
415 			return 0;
416 		}
417 
418 		udelay(1);
419 	}
420 
421 	return -ETIME;
422 }
423 
424 static int tegra_hsp_mailbox_startup(struct mbox_chan *chan)
425 {
426 	struct tegra_hsp_mailbox *mb = chan->con_priv;
427 	struct tegra_hsp_channel *ch = &mb->channel;
428 	struct tegra_hsp *hsp = mb->channel.hsp;
429 	unsigned long flags;
430 
431 	chan->txdone_method = TXDONE_BY_IRQ;
432 
433 	/*
434 	 * Shared mailboxes start out as consumers by default. FULL and EMPTY
435 	 * interrupts are coalesced at the same shared interrupt.
436 	 *
437 	 * Keep EMPTY interrupts disabled at startup and only enable them when
438 	 * the mailbox is actually full. This is required because the FULL and
439 	 * EMPTY interrupts are level-triggered, so keeping EMPTY interrupts
440 	 * enabled all the time would cause an interrupt storm while mailboxes
441 	 * are idle.
442 	 */
443 
444 	spin_lock_irqsave(&hsp->lock, flags);
445 
446 	if (mb->producer)
447 		hsp->mask &= ~BIT(HSP_INT_EMPTY_SHIFT + mb->index);
448 	else
449 		hsp->mask |= BIT(HSP_INT_FULL_SHIFT + mb->index);
450 
451 	tegra_hsp_writel(hsp, hsp->mask, HSP_INT_IE(hsp->shared_irq));
452 
453 	spin_unlock_irqrestore(&hsp->lock, flags);
454 
455 	if (hsp->soc->has_per_mb_ie) {
456 		if (mb->producer)
457 			tegra_hsp_channel_writel(ch, 0x0,
458 						 HSP_SM_SHRD_MBOX_EMPTY_INT_IE);
459 		else
460 			tegra_hsp_channel_writel(ch, 0x1,
461 						 HSP_SM_SHRD_MBOX_FULL_INT_IE);
462 	}
463 
464 	return 0;
465 }
466 
467 static void tegra_hsp_mailbox_shutdown(struct mbox_chan *chan)
468 {
469 	struct tegra_hsp_mailbox *mb = chan->con_priv;
470 	struct tegra_hsp_channel *ch = &mb->channel;
471 	struct tegra_hsp *hsp = mb->channel.hsp;
472 	unsigned long flags;
473 
474 	if (hsp->soc->has_per_mb_ie) {
475 		if (mb->producer)
476 			tegra_hsp_channel_writel(ch, 0x0,
477 						 HSP_SM_SHRD_MBOX_EMPTY_INT_IE);
478 		else
479 			tegra_hsp_channel_writel(ch, 0x0,
480 						 HSP_SM_SHRD_MBOX_FULL_INT_IE);
481 	}
482 
483 	spin_lock_irqsave(&hsp->lock, flags);
484 
485 	if (mb->producer)
486 		hsp->mask &= ~BIT(HSP_INT_EMPTY_SHIFT + mb->index);
487 	else
488 		hsp->mask &= ~BIT(HSP_INT_FULL_SHIFT + mb->index);
489 
490 	tegra_hsp_writel(hsp, hsp->mask, HSP_INT_IE(hsp->shared_irq));
491 
492 	spin_unlock_irqrestore(&hsp->lock, flags);
493 }
494 
495 static const struct mbox_chan_ops tegra_hsp_sm_ops = {
496 	.send_data = tegra_hsp_mailbox_send_data,
497 	.flush = tegra_hsp_mailbox_flush,
498 	.startup = tegra_hsp_mailbox_startup,
499 	.shutdown = tegra_hsp_mailbox_shutdown,
500 };
501 
502 static struct mbox_chan *tegra_hsp_db_xlate(struct mbox_controller *mbox,
503 					    const struct of_phandle_args *args)
504 {
505 	struct tegra_hsp *hsp = container_of(mbox, struct tegra_hsp, mbox_db);
506 	unsigned int type = args->args[0], master = args->args[1];
507 	struct tegra_hsp_channel *channel = ERR_PTR(-ENODEV);
508 	struct tegra_hsp_doorbell *db;
509 	struct mbox_chan *chan;
510 	unsigned long flags;
511 	unsigned int i;
512 
513 	if (type != TEGRA_HSP_MBOX_TYPE_DB || !hsp->doorbell_irq)
514 		return ERR_PTR(-ENODEV);
515 
516 	db = tegra_hsp_doorbell_get(hsp, master);
517 	if (db)
518 		channel = &db->channel;
519 
520 	if (IS_ERR(channel))
521 		return ERR_CAST(channel);
522 
523 	spin_lock_irqsave(&hsp->lock, flags);
524 
525 	for (i = 0; i < mbox->num_chans; i++) {
526 		chan = &mbox->chans[i];
527 		if (!chan->con_priv) {
528 			channel->chan = chan;
529 			chan->con_priv = db;
530 			break;
531 		}
532 
533 		chan = NULL;
534 	}
535 
536 	spin_unlock_irqrestore(&hsp->lock, flags);
537 
538 	return chan ?: ERR_PTR(-EBUSY);
539 }
540 
541 static struct mbox_chan *tegra_hsp_sm_xlate(struct mbox_controller *mbox,
542 					    const struct of_phandle_args *args)
543 {
544 	struct tegra_hsp *hsp = container_of(mbox, struct tegra_hsp, mbox_sm);
545 	unsigned int type = args->args[0], index;
546 	struct tegra_hsp_mailbox *mb;
547 
548 	index = args->args[1] & TEGRA_HSP_SM_MASK;
549 
550 	if (type != TEGRA_HSP_MBOX_TYPE_SM || !hsp->shared_irqs ||
551 	    index >= hsp->num_sm)
552 		return ERR_PTR(-ENODEV);
553 
554 	mb = &hsp->mailboxes[index];
555 
556 	if ((args->args[1] & TEGRA_HSP_SM_FLAG_TX) == 0)
557 		mb->producer = false;
558 	else
559 		mb->producer = true;
560 
561 	return mb->channel.chan;
562 }
563 
564 static int tegra_hsp_add_doorbells(struct tegra_hsp *hsp)
565 {
566 	const struct tegra_hsp_db_map *map = hsp->soc->map;
567 	struct tegra_hsp_channel *channel;
568 
569 	while (map->name) {
570 		channel = tegra_hsp_doorbell_create(hsp, map->name,
571 						    map->master, map->index);
572 		if (IS_ERR(channel))
573 			return PTR_ERR(channel);
574 
575 		map++;
576 	}
577 
578 	return 0;
579 }
580 
581 static int tegra_hsp_add_mailboxes(struct tegra_hsp *hsp, struct device *dev)
582 {
583 	int i;
584 
585 	hsp->mailboxes = devm_kcalloc(dev, hsp->num_sm, sizeof(*hsp->mailboxes),
586 				      GFP_KERNEL);
587 	if (!hsp->mailboxes)
588 		return -ENOMEM;
589 
590 	for (i = 0; i < hsp->num_sm; i++) {
591 		struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
592 
593 		mb->index = i;
594 
595 		mb->channel.hsp = hsp;
596 		mb->channel.regs = hsp->regs + SZ_64K + i * SZ_32K;
597 		mb->channel.chan = &hsp->mbox_sm.chans[i];
598 		mb->channel.chan->con_priv = mb;
599 	}
600 
601 	return 0;
602 }
603 
604 static int tegra_hsp_request_shared_irq(struct tegra_hsp *hsp)
605 {
606 	unsigned int i, irq = 0;
607 	int err;
608 
609 	for (i = 0; i < hsp->num_si; i++) {
610 		irq = hsp->shared_irqs[i];
611 		if (irq <= 0)
612 			continue;
613 
614 		err = devm_request_irq(hsp->dev, irq, tegra_hsp_shared_irq, 0,
615 				       dev_name(hsp->dev), hsp);
616 		if (err < 0) {
617 			dev_err(hsp->dev, "failed to request interrupt: %d\n",
618 				err);
619 			continue;
620 		}
621 
622 		hsp->shared_irq = i;
623 
624 		/* disable all interrupts */
625 		tegra_hsp_writel(hsp, 0, HSP_INT_IE(hsp->shared_irq));
626 
627 		dev_dbg(hsp->dev, "interrupt requested: %u\n", irq);
628 
629 		break;
630 	}
631 
632 	if (i == hsp->num_si) {
633 		dev_err(hsp->dev, "failed to find available interrupt\n");
634 		return -ENOENT;
635 	}
636 
637 	return 0;
638 }
639 
640 static int tegra_hsp_probe(struct platform_device *pdev)
641 {
642 	struct tegra_hsp *hsp;
643 	struct resource *res;
644 	unsigned int i;
645 	u32 value;
646 	int err;
647 
648 	hsp = devm_kzalloc(&pdev->dev, sizeof(*hsp), GFP_KERNEL);
649 	if (!hsp)
650 		return -ENOMEM;
651 
652 	hsp->dev = &pdev->dev;
653 	hsp->soc = of_device_get_match_data(&pdev->dev);
654 	INIT_LIST_HEAD(&hsp->doorbells);
655 	spin_lock_init(&hsp->lock);
656 
657 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
658 	hsp->regs = devm_ioremap_resource(&pdev->dev, res);
659 	if (IS_ERR(hsp->regs))
660 		return PTR_ERR(hsp->regs);
661 
662 	value = tegra_hsp_readl(hsp, HSP_INT_DIMENSIONING);
663 	hsp->num_sm = (value >> HSP_nSM_SHIFT) & HSP_nINT_MASK;
664 	hsp->num_ss = (value >> HSP_nSS_SHIFT) & HSP_nINT_MASK;
665 	hsp->num_as = (value >> HSP_nAS_SHIFT) & HSP_nINT_MASK;
666 	hsp->num_db = (value >> HSP_nDB_SHIFT) & HSP_nINT_MASK;
667 	hsp->num_si = (value >> HSP_nSI_SHIFT) & HSP_nINT_MASK;
668 
669 	err = platform_get_irq_byname_optional(pdev, "doorbell");
670 	if (err >= 0)
671 		hsp->doorbell_irq = err;
672 
673 	if (hsp->num_si > 0) {
674 		unsigned int count = 0;
675 
676 		hsp->shared_irqs = devm_kcalloc(&pdev->dev, hsp->num_si,
677 						sizeof(*hsp->shared_irqs),
678 						GFP_KERNEL);
679 		if (!hsp->shared_irqs)
680 			return -ENOMEM;
681 
682 		for (i = 0; i < hsp->num_si; i++) {
683 			char *name;
684 
685 			name = kasprintf(GFP_KERNEL, "shared%u", i);
686 			if (!name)
687 				return -ENOMEM;
688 
689 			err = platform_get_irq_byname_optional(pdev, name);
690 			if (err >= 0) {
691 				hsp->shared_irqs[i] = err;
692 				count++;
693 			}
694 
695 			kfree(name);
696 		}
697 
698 		if (count == 0) {
699 			devm_kfree(&pdev->dev, hsp->shared_irqs);
700 			hsp->shared_irqs = NULL;
701 		}
702 	}
703 
704 	/* setup the doorbell controller */
705 	hsp->mbox_db.of_xlate = tegra_hsp_db_xlate;
706 	hsp->mbox_db.num_chans = 32;
707 	hsp->mbox_db.dev = &pdev->dev;
708 	hsp->mbox_db.ops = &tegra_hsp_db_ops;
709 
710 	hsp->mbox_db.chans = devm_kcalloc(&pdev->dev, hsp->mbox_db.num_chans,
711 					  sizeof(*hsp->mbox_db.chans),
712 					  GFP_KERNEL);
713 	if (!hsp->mbox_db.chans)
714 		return -ENOMEM;
715 
716 	if (hsp->doorbell_irq) {
717 		err = tegra_hsp_add_doorbells(hsp);
718 		if (err < 0) {
719 			dev_err(&pdev->dev, "failed to add doorbells: %d\n",
720 			        err);
721 			return err;
722 		}
723 	}
724 
725 	err = devm_mbox_controller_register(&pdev->dev, &hsp->mbox_db);
726 	if (err < 0) {
727 		dev_err(&pdev->dev, "failed to register doorbell mailbox: %d\n",
728 			err);
729 		return err;
730 	}
731 
732 	/* setup the shared mailbox controller */
733 	hsp->mbox_sm.of_xlate = tegra_hsp_sm_xlate;
734 	hsp->mbox_sm.num_chans = hsp->num_sm;
735 	hsp->mbox_sm.dev = &pdev->dev;
736 	hsp->mbox_sm.ops = &tegra_hsp_sm_ops;
737 
738 	hsp->mbox_sm.chans = devm_kcalloc(&pdev->dev, hsp->mbox_sm.num_chans,
739 					  sizeof(*hsp->mbox_sm.chans),
740 					  GFP_KERNEL);
741 	if (!hsp->mbox_sm.chans)
742 		return -ENOMEM;
743 
744 	if (hsp->shared_irqs) {
745 		err = tegra_hsp_add_mailboxes(hsp, &pdev->dev);
746 		if (err < 0) {
747 			dev_err(&pdev->dev, "failed to add mailboxes: %d\n",
748 			        err);
749 			return err;
750 		}
751 	}
752 
753 	err = devm_mbox_controller_register(&pdev->dev, &hsp->mbox_sm);
754 	if (err < 0) {
755 		dev_err(&pdev->dev, "failed to register shared mailbox: %d\n",
756 			err);
757 		return err;
758 	}
759 
760 	platform_set_drvdata(pdev, hsp);
761 
762 	if (hsp->doorbell_irq) {
763 		err = devm_request_irq(&pdev->dev, hsp->doorbell_irq,
764 				       tegra_hsp_doorbell_irq, IRQF_NO_SUSPEND,
765 				       dev_name(&pdev->dev), hsp);
766 		if (err < 0) {
767 			dev_err(&pdev->dev,
768 			        "failed to request doorbell IRQ#%u: %d\n",
769 				hsp->doorbell_irq, err);
770 			return err;
771 		}
772 	}
773 
774 	if (hsp->shared_irqs) {
775 		err = tegra_hsp_request_shared_irq(hsp);
776 		if (err < 0)
777 			return err;
778 	}
779 
780 	lockdep_register_key(&hsp->lock_key);
781 	lockdep_set_class(&hsp->lock, &hsp->lock_key);
782 
783 	return 0;
784 }
785 
786 static int tegra_hsp_remove(struct platform_device *pdev)
787 {
788 	struct tegra_hsp *hsp = platform_get_drvdata(pdev);
789 
790 	lockdep_unregister_key(&hsp->lock_key);
791 
792 	return 0;
793 }
794 
795 static int __maybe_unused tegra_hsp_resume(struct device *dev)
796 {
797 	struct tegra_hsp *hsp = dev_get_drvdata(dev);
798 	unsigned int i;
799 	struct tegra_hsp_doorbell *db;
800 
801 	list_for_each_entry(db, &hsp->doorbells, list) {
802 		if (db && db->channel.chan)
803 			tegra_hsp_doorbell_startup(db->channel.chan);
804 	}
805 
806 	if (hsp->mailboxes) {
807 		for (i = 0; i < hsp->num_sm; i++) {
808 			struct tegra_hsp_mailbox *mb = &hsp->mailboxes[i];
809 
810 			if (mb->channel.chan->cl)
811 				tegra_hsp_mailbox_startup(mb->channel.chan);
812 		}
813 	}
814 
815 	return 0;
816 }
817 
818 static const struct dev_pm_ops tegra_hsp_pm_ops = {
819 	.resume_noirq = tegra_hsp_resume,
820 };
821 
822 static const struct tegra_hsp_db_map tegra186_hsp_db_map[] = {
823 	{ "ccplex", TEGRA_HSP_DB_MASTER_CCPLEX, HSP_DB_CCPLEX, },
824 	{ "bpmp",   TEGRA_HSP_DB_MASTER_BPMP,   HSP_DB_BPMP,   },
825 	{ /* sentinel */ }
826 };
827 
828 static const struct tegra_hsp_soc tegra186_hsp_soc = {
829 	.map = tegra186_hsp_db_map,
830 	.has_per_mb_ie = false,
831 };
832 
833 static const struct tegra_hsp_soc tegra194_hsp_soc = {
834 	.map = tegra186_hsp_db_map,
835 	.has_per_mb_ie = true,
836 };
837 
838 static const struct of_device_id tegra_hsp_match[] = {
839 	{ .compatible = "nvidia,tegra186-hsp", .data = &tegra186_hsp_soc },
840 	{ .compatible = "nvidia,tegra194-hsp", .data = &tegra194_hsp_soc },
841 	{ }
842 };
843 
844 static struct platform_driver tegra_hsp_driver = {
845 	.driver = {
846 		.name = "tegra-hsp",
847 		.of_match_table = tegra_hsp_match,
848 		.pm = &tegra_hsp_pm_ops,
849 	},
850 	.probe = tegra_hsp_probe,
851 	.remove = tegra_hsp_remove,
852 };
853 
854 static int __init tegra_hsp_init(void)
855 {
856 	return platform_driver_register(&tegra_hsp_driver);
857 }
858 core_initcall(tegra_hsp_init);
859