aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/mailbox/ti-msgmgr.c
blob: 78753a87ba4d112367d6b4c6691cd9b0f062e575 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
// SPDX-License-Identifier: GPL-2.0
/*
 * Texas Instruments' Message Manager Driver
 *
 * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/
 *	Nishanth Menon
 */

#define pr_fmt(fmt) "%s: " fmt, __func__

#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_controller.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/soc/ti/ti-msgmgr.h>

#define Q_DATA_OFFSET(proxy, queue, reg)	\
		     ((0x10000 * (proxy)) + (0x80 * (queue)) + ((reg) * 4))
#define Q_STATE_OFFSET(queue)			((queue) * 0x4)
#define Q_STATE_ENTRY_COUNT_MASK		(0xFFF000)

/**
 * struct ti_msgmgr_valid_queue_desc - SoC valid queues meant for this processor
 * @queue_id:	Queue Number for this path
 * @proxy_id:	Proxy ID representing the processor in SoC
 * @is_tx:	Is this a receive path?
 */
struct ti_msgmgr_valid_queue_desc {
	u8 queue_id;
	u8 proxy_id;
	bool is_tx;
};

/**
 * struct ti_msgmgr_desc - Description of message manager integration
 * @queue_count:	Number of Queues
 * @max_message_size:	Message size in bytes
 * @max_messages:	Number of messages
 * @q_slices:		Number of queue engines
 * @q_proxies:		Number of queue proxies per page
 * @data_first_reg:	First data register for proxy data region
 * @data_last_reg:	Last data register for proxy data region
 * @tx_polled:		Do I need to use polled mechanism for tx
 * @tx_poll_timeout_ms: Timeout in ms if polled
 * @valid_queues:	List of Valid queues that the processor can access
 * @num_valid_queues:	Number of valid queues
 *
 * This structure is used in of match data to describe how integration
 * for a specific compatible SoC is done.
 */
struct ti_msgmgr_desc {
	u8 queue_count;
	u8 max_message_size;
	u8 max_messages;
	u8 q_slices;
	u8 q_proxies;
	u8 data_first_reg;
	u8 data_last_reg;
	bool tx_polled;
	int tx_poll_timeout_ms;
	const struct ti_msgmgr_valid_queue_desc *valid_queues;
	int num_valid_queues;
};

/**
 * struct ti_queue_inst - Description of a queue instance
 * @name:	Queue Name
 * @queue_id:	Queue Identifier as mapped on SoC
 * @proxy_id:	Proxy Identifier as mapped on SoC
 * @irq:	IRQ for Rx Queue
 * @is_tx:	'true' if transmit queue, else, 'false'
 * @queue_buff_start: First register of Data Buffer
 * @queue_buff_end: Last (or confirmation) register of Data buffer
 * @queue_state: Queue status register
 * @chan:	Mailbox channel
 * @rx_buff:	Receive buffer pointer allocated at probe, max_message_size
 */
struct ti_queue_inst {
	char name[30];
	u8 queue_id;
	u8 proxy_id;
	int irq;
	bool is_tx;
	void __iomem *queue_buff_start;
	void __iomem *queue_buff_end;
	void __iomem *queue_state;
	struct mbox_chan *chan;
	u32 *rx_buff;
};

/**
 * struct ti_msgmgr_inst - Description of a Message Manager Instance
 * @dev:	device pointer corresponding to the Message Manager instance
 * @desc:	Description of the SoC integration
 * @queue_proxy_region:	Queue proxy region where queue buffers are located
 * @queue_state_debug_region:	Queue status register regions
 * @num_valid_queues:	Number of valid queues defined for the processor
 *		Note: other queues are probably reserved for other processors
 *		in the SoC.
 * @qinsts:	Array of valid Queue Instances for the Processor
 * @mbox:	Mailbox Controller
 * @chans:	Array for channels corresponding to the Queue Instances.
 */
struct ti_msgmgr_inst {
	struct device *dev;
	const struct ti_msgmgr_desc *desc;
	void __iomem *queue_proxy_region;
	void __iomem *queue_state_debug_region;
	u8 num_valid_queues;
	struct ti_queue_inst *qinsts;
	struct mbox_controller mbox;
	struct mbox_chan *chans;
};

/**
 * ti_msgmgr_queue_get_num_messages() - Get the number of pending messages
 * @qinst:	Queue instance for which we check the number of pending messages
 *
 * Return: number of messages pending in the queue (0 == no pending messages)
 */
static inline int ti_msgmgr_queue_get_num_messages(struct ti_queue_inst *qinst)
{
	u32 val;

	/*
	 * We cannot use relaxed operation here - update may happen
	 * real-time.
	 */
	val = readl(qinst->queue_state) & Q_STATE_ENTRY_COUNT_MASK;
	val >>= __ffs(Q_STATE_ENTRY_COUNT_MASK);

	return val;
}

/**
 * ti_msgmgr_queue_rx_interrupt() - Interrupt handler for receive Queue
 * @irq:	Interrupt number
 * @p:		Channel Pointer
 *
 * Return: -EINVAL if there is no instance
 * IRQ_NONE if the interrupt is not ours.
 * IRQ_HANDLED if the rx interrupt was successfully handled.
 */
static irqreturn_t ti_msgmgr_queue_rx_interrupt(int irq, void *p)
{
	struct mbox_chan *chan = p;
	struct device *dev = chan->mbox->dev;
	struct ti_msgmgr_inst *inst = dev_get_drvdata(dev);
	struct ti_queue_inst *qinst = chan->con_priv;
	const struct ti_msgmgr_desc *desc;
	int msg_count, num_words;
	struct ti_msgmgr_message message;
	void __iomem *data_reg;
	u32 *word_data;

	if (WARN_ON(!inst)) {
		dev_err(dev, "no platform drv data??\n");
		return -EINVAL;
	}

	/* Do I have an invalid interrupt source? */
	if (qinst->is_tx) {
		dev_err(dev, "Cannot handle rx interrupt on tx channel %s\n",
			qinst->name);
		return IRQ_NONE;
	}

	/* Do I actually have messages to read? */
	msg_count = ti_msgmgr_queue_get_num_messages(qinst);
	if (!msg_count) {
		/* Shared IRQ? */
		dev_dbg(dev, "Spurious event - 0 pending data!\n");
		return IRQ_NONE;
	}

	/*
	 * I have no idea about the protocol being used to communicate with the
	 * remote producer - 0 could be valid data, so I wont make a judgement
	 * of how many bytes I should be reading. Let the client figure this
	 * out.. I just read the full message and pass it on..
	 */
	desc = inst->desc;
	message.len = desc->max_message_size;
	message.buf = (u8 *)qinst->rx_buff;

	/*
	 * NOTE about register access involved here:
	 * the hardware block is implemented with 32bit access operations and no
	 * support for data splitting.  We don't want the hardware to misbehave
	 * with sub 32bit access - For example: if the last register read is
	 * split into byte wise access, it can result in the queue getting
	 * stuck or indeterminate behavior. An out of order read operation may
	 * result in weird data results as well.
	 * Hence, we do not use memcpy_fromio or __ioread32_copy here, instead
	 * we depend on readl for the purpose.
	 *
	 * Also note that the final register read automatically marks the
	 * queue message as read.
	 */
	for (data_reg = qinst->queue_buff_start, word_data = qinst->rx_buff,
	     num_words = (desc->max_message_size / sizeof(u32));
	     num_words; num_words--, data_reg += sizeof(u32), word_data++)
		*word_data = readl(data_reg);

	/*
	 * Last register read automatically clears the IRQ if only 1 message
	 * is pending - so send the data up the stack..
	 * NOTE: Client is expected to be as optimal as possible, since
	 * we invoke the handler in IRQ context.
	 */
	mbox_chan_received_data(chan, (void *)&message);

	return IRQ_HANDLED;
}

/**
 * ti_msgmgr_queue_peek_data() - Peek to see if there are any rx messages.
 * @chan:	Channel Pointer
 *
 * Return: 'true' if there is pending rx data, 'false' if there is none.
 */
static bool ti_msgmgr_queue_peek_data(struct mbox_chan *chan)
{
	struct ti_queue_inst *qinst = chan->con_priv;
	int msg_count;

	if (qinst->is_tx)
		return false;

	msg_count = ti_msgmgr_queue_get_num_messages(qinst);

	return msg_count ? true : false;
}

/**
 * ti_msgmgr_last_tx_done() - See if all the tx messages are sent
 * @chan:	Channel pointer
 *
 * Return: 'true' is no pending tx data, 'false' if there are any.
 */
static bool ti_msgmgr_last_tx_done(struct mbox_chan *chan)
{
	struct ti_queue_inst *qinst = chan->con_priv;
	int msg_count;

	if (!qinst->is_tx)
		return false;

	msg_count = ti_msgmgr_queue_get_num_messages(qinst);

	/* if we have any messages pending.. */
	return msg_count ? false : true;
}

/**
 * ti_msgmgr_send_data() - Send data
 * @chan:	Channel Pointer
 * @data:	ti_msgmgr_message * Message Pointer
 *
 * Return: 0 if all goes good, else appropriate error messages.
 */
static int ti_msgmgr_send_data(struct mbox_chan *chan, void *data)
{
	struct device *dev = chan->mbox->dev;
	struct ti_msgmgr_inst *inst = dev_get_drvdata(dev);
	const struct ti_msgmgr_desc *desc;
	struct ti_queue_inst *qinst = chan->con_priv;
	int num_words, trail_bytes;
	struct ti_msgmgr_message *message = data;
	void __iomem *data_reg;
	u32 *word_data;

	if (WARN_ON(!inst)) {
		dev_err(dev, "no platform drv data??\n");
		return -EINVAL;
	}
	desc = inst->desc;

	if (desc->max_message_size < message->len) {
		dev_err(dev, "Queue %s message length %zu > max %d\n",
			qinst->name, message->len, desc->max_message_size);
		return -EINVAL;
	}

	/* NOTE: Constraints similar to rx path exists here as well */
	for (data_reg = qinst->queue_buff_start,
	     num_words = message->len / sizeof(u32),
	     word_data = (u32 *)message->buf;
	     num_words; num_words--, data_reg += sizeof(u32), word_data++)
		writel(*word_data, data_reg);

	trail_bytes = message->len % sizeof(u32);
	if (trail_bytes) {
		u32 data_trail = *word_data;

		/* Ensure all unused data is 0 */
		data_trail &= 0xFFFFFFFF >> (8 * (sizeof(u32) - trail_bytes));
		writel(data_trail, data_reg);
		data_reg++;
	}
	/*
	 * 'data_reg' indicates next register to write. If we did not already
	 * write on tx complete reg(last reg), we must do so for transmit
	 */
	if (data_reg <= qinst->queue_buff_end)
		writel(0, qinst->queue_buff_end);

	return 0;
}

/**
 * ti_msgmgr_queue_startup() - Startup queue
 * @chan:	Channel pointer
 *
 * Return: 0 if all goes good, else return corresponding error message
 */
static int ti_msgmgr_queue_startup(struct mbox_chan *chan)
{
	struct ti_queue_inst *qinst = chan->con_priv;
	struct device *dev = chan->mbox->dev;
	int ret;

	if (!qinst->is_tx) {
		/*
		 * With the expectation that the IRQ might be shared in SoC
		 */
		ret = request_irq(qinst->irq, ti_msgmgr_queue_rx_interrupt,
				  IRQF_SHARED, qinst->name, chan);
		if (ret) {
			dev_err(dev, "Unable to get IRQ %d on %s(res=%d)\n",
				qinst->irq, qinst->name, ret);
			return ret;
		}
	}

	return 0;
}

/**
 * ti_msgmgr_queue_shutdown() - Shutdown the queue
 * @chan:	Channel pointer
 */
static void ti_msgmgr_queue_shutdown(struct mbox_chan *chan)
{
	struct ti_queue_inst *qinst = chan->con_priv;

	if (!qinst->is_tx)
		free_irq(qinst->irq, chan);
}

/**
 * ti_msgmgr_of_xlate() - Translation of phandle to queue
 * @mbox:	Mailbox controller
 * @p:		phandle pointer
 *
 * Return: Mailbox channel corresponding to the queue, else return error
 * pointer.
 */
static struct mbox_chan *ti_msgmgr_of_xlate(struct mbox_controller *mbox,
					    const struct of_phandle_args *p)
{
	struct ti_msgmgr_inst *inst;
	int req_qid, req_pid;
	struct ti_queue_inst *qinst;
	int i;

	inst = container_of(mbox, struct ti_msgmgr_inst, mbox);
	if (WARN_ON(!inst))
		return ERR_PTR(-EINVAL);

	/* #mbox-cells is 2 */
	if (p->args_count != 2) {
		dev_err(inst->dev, "Invalid arguments in dt[%d] instead of 2\n",
			p->args_count);
		return ERR_PTR(-EINVAL);
	}
	req_qid = p->args[0];
	req_pid = p->args[1];

	for (qinst = inst->qinsts, i = 0; i < inst->num_valid_queues;
	     i++, qinst++) {
		if (req_qid == qinst->queue_id && req_pid == qinst->proxy_id)
			return qinst->chan;
	}

	dev_err(inst->dev, "Queue ID %d, Proxy ID %d is wrong on %s\n",
		req_qid, req_pid, p->np->name);
	return ERR_PTR(-ENOENT);
}

/**
 * ti_msgmgr_queue_setup() - Setup data structures for each queue instance
 * @idx:	index of the queue
 * @dev:	pointer to the message manager device
 * @np:		pointer to the of node
 * @inst:	Queue instance pointer
 * @d:		Message Manager instance description data
 * @qd:		Queue description data
 * @qinst:	Queue instance pointer
 * @chan:	pointer to mailbox channel
 *
 * Return: 0 if all went well, else return corresponding error
 */
static int ti_msgmgr_queue_setup(int idx, struct device *dev,
				 struct device_node *np,
				 struct ti_msgmgr_inst *inst,
				 const struct ti_msgmgr_desc *d,
				 const struct ti_msgmgr_valid_queue_desc *qd,
				 struct ti_queue_inst *qinst,
				 struct mbox_chan *chan)
{
	qinst->proxy_id = qd->proxy_id;
	qinst->queue_id = qd->queue_id;

	if (qinst->queue_id > d->queue_count) {
		dev_err(dev, "Queue Data [idx=%d] queuid %d > %d\n",
			idx, qinst->queue_id, d->queue_count);
		return -ERANGE;
	}

	qinst->is_tx = qd->is_tx;
	snprintf(qinst->name, sizeof(qinst->name), "%s %s_%03d_%03d",
		 dev_name(dev), qinst->is_tx ? "tx" : "rx", qinst->queue_id,
		 qinst->proxy_id);

	if (!qinst->is_tx) {
		char of_rx_irq_name[7];

		snprintf(of_rx_irq_name, sizeof(of_rx_irq_name),
			 "rx_%03d", qinst->queue_id);

		qinst->irq = of_irq_get_byname(np, of_rx_irq_name);
		if (qinst->irq < 0) {
			dev_crit(dev,
				 "[%d]QID %d PID %d:No IRQ[%s]: %d\n",
				 idx, qinst->queue_id, qinst->proxy_id,
				 of_rx_irq_name, qinst->irq);
			return qinst->irq;
		}
		/* Allocate usage buffer for rx */
		qinst->rx_buff = devm_kzalloc(dev,
					      d->max_message_size, GFP_KERNEL);
		if (!qinst->rx_buff)
			return -ENOMEM;
	}

	qinst->queue_buff_start = inst->queue_proxy_region +
	    Q_DATA_OFFSET(qinst->proxy_id, qinst->queue_id, d->data_first_reg);
	qinst->queue_buff_end = inst->queue_proxy_region +
	    Q_DATA_OFFSET(qinst->proxy_id, qinst->queue_id, d->data_last_reg);
	qinst->queue_state = inst->queue_state_debug_region +
	    Q_STATE_OFFSET(qinst->queue_id);
	qinst->chan = chan;

	chan->con_priv = qinst;

	dev_dbg(dev, "[%d] qidx=%d pidx=%d irq=%d q_s=%p q_e = %p\n",
		idx, qinst->queue_id, qinst->proxy_id, qinst->irq,
		qinst->queue_buff_start, qinst->queue_buff_end);
	return 0;
}

/* Queue operations */
static const struct mbox_chan_ops ti_msgmgr_chan_ops = {
	.startup = ti_msgmgr_queue_startup,
	.shutdown = ti_msgmgr_queue_shutdown,
	.peek_data = ti_msgmgr_queue_peek_data,
	.last_tx_done = ti_msgmgr_last_tx_done,
	.send_data = ti_msgmgr_send_data,
};

/* Keystone K2G SoC integration details */
static const struct ti_msgmgr_valid_queue_desc k2g_valid_queues[] = {
	{.queue_id = 0, .proxy_id = 0, .is_tx = true,},
	{.queue_id = 1, .proxy_id = 0, .is_tx = true,},
	{.queue_id = 2, .proxy_id = 0, .is_tx = true,},
	{.queue_id = 3, .proxy_id = 0, .is_tx = true,},
	{.queue_id = 5, .proxy_id = 2, .is_tx = false,},
	{.queue_id = 56, .proxy_id = 1, .is_tx = true,},
	{.queue_id = 57, .proxy_id = 2, .is_tx = false,},
	{.queue_id = 58, .proxy_id = 3, .is_tx = true,},
	{.queue_id = 59, .proxy_id = 4, .is_tx = true,},
	{.queue_id = 60, .proxy_id = 5, .is_tx = true,},
	{.queue_id = 61, .proxy_id = 6, .is_tx = true,},
};

static const struct ti_msgmgr_desc k2g_desc = {
	.queue_count = 64,
	.max_message_size = 64,
	.max_messages = 128,
	.q_slices = 1,
	.q_proxies = 1,
	.data_first_reg = 16,
	.data_last_reg = 31,
	.tx_polled = false,
	.valid_queues = k2g_valid_queues,
	.num_valid_queues = ARRAY_SIZE(k2g_valid_queues),
};

static const struct of_device_id ti_msgmgr_of_match[] = {
	{.compatible = "ti,k2g-message-manager", .data = &k2g_desc},
	{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, ti_msgmgr_of_match);

static int ti_msgmgr_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct of_device_id *of_id;
	struct device_node *np;
	struct resource *res;
	const struct ti_msgmgr_desc *desc;
	struct ti_msgmgr_inst *inst;
	struct ti_queue_inst *qinst;
	struct mbox_controller *mbox;
	struct mbox_chan *chans;
	int queue_count;
	int i;
	int ret = -EINVAL;
	const struct ti_msgmgr_valid_queue_desc *queue_desc;

	if (!dev->of_node) {
		dev_err(dev, "no OF information\n");
		return -EINVAL;
	}
	np = dev->of_node;

	of_id = of_match_device(ti_msgmgr_of_match, dev);
	if (!of_id) {
		dev_err(dev, "OF data missing\n");
		return -EINVAL;
	}
	desc = of_id->data;

	inst = devm_kzalloc(dev, sizeof(*inst), GFP_KERNEL);
	if (!inst)
		return -ENOMEM;

	inst->dev = dev;
	inst->desc = desc;

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
					   "queue_proxy_region");
	inst->queue_proxy_region = devm_ioremap_resource(dev, res);
	if (IS_ERR(inst->queue_proxy_region))
		return PTR_ERR(inst->queue_proxy_region);

	res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
					   "queue_state_debug_region");
	inst->queue_state_debug_region = devm_ioremap_resource(dev, res);
	if (IS_ERR(inst->queue_state_debug_region))
		return PTR_ERR(inst->queue_state_debug_region);

	dev_dbg(dev, "proxy region=%p, queue_state=%p\n",
		inst->queue_proxy_region, inst->queue_state_debug_region);

	queue_count = desc->num_valid_queues;
	if (!queue_count || queue_count > desc->queue_count) {
		dev_crit(dev, "Invalid Number of queues %d. Max %d\n",
			 queue_count, desc->queue_count);
		return -ERANGE;
	}
	inst->num_valid_queues = queue_count;

	qinst = devm_kzalloc(dev, sizeof(*qinst) * queue_count, GFP_KERNEL);
	if (!qinst)
		return -ENOMEM;
	inst->qinsts = qinst;

	chans = devm_kzalloc(dev, sizeof(*chans) * queue_count, GFP_KERNEL);
	if (!chans)
		return -ENOMEM;
	inst->chans = chans;

	for (i = 0, queue_desc = desc->valid_queues;
	     i < queue_count; i++, qinst++, chans++, queue_desc++) {
		ret = ti_msgmgr_queue_setup(i, dev, np, inst,
					    desc, queue_desc, qinst, chans);
		if (ret)
			return ret;
	}

	mbox = &inst->mbox;
	mbox->dev = dev;
	mbox->ops = &ti_msgmgr_chan_ops;
	mbox->chans = inst->chans;
	mbox->num_chans = inst->num_valid_queues;
	mbox->txdone_irq = false;
	mbox->txdone_poll = desc->tx_polled;
	if (desc->tx_polled)
		mbox->txpoll_period = desc->tx_poll_timeout_ms;
	mbox->of_xlate = ti_msgmgr_of_xlate;

	platform_set_drvdata(pdev, inst);
	ret = mbox_controller_register(mbox);
	if (ret)
		dev_err(dev, "Failed to register mbox_controller(%d)\n", ret);

	return ret;
}

static int ti_msgmgr_remove(struct platform_device *pdev)
{
	struct ti_msgmgr_inst *inst;

	inst = platform_get_drvdata(pdev);
	mbox_controller_unregister(&inst->mbox);

	return 0;
}

static struct platform_driver ti_msgmgr_driver = {
	.probe = ti_msgmgr_probe,
	.remove = ti_msgmgr_remove,
	.driver = {
		   .name = "ti-msgmgr",
		   .of_match_table = of_match_ptr(ti_msgmgr_of_match),
	},
};
module_platform_driver(ti_msgmgr_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TI message manager driver");
MODULE_AUTHOR("Nishanth Menon");
MODULE_ALIAS("platform:ti-msgmgr");

Privacy Policy