aboutsummaryrefslogtreecommitdiff
path: root/drivers/fpga/stratix10-soc.c
blob: 215d33789c74739aedb410baa26f3501c35d3e24 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * FPGA Manager Driver for Intel Stratix10 SoC
 *
 *  Copyright (C) 2018 Intel Corporation
 */
#include <linux/completion.h>
#include <linux/fpga/fpga-mgr.h>
#include <linux/firmware/intel/stratix10-svc-client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>

/*
 * FPGA programming requires a higher level of privilege (EL3), per the SoC
 * design.
 */
#define NUM_SVC_BUFS	4
#define SVC_BUF_SIZE	SZ_512K

/* Indicates buffer is in use if set */
#define SVC_BUF_LOCK	0

#define S10_BUFFER_TIMEOUT (msecs_to_jiffies(SVC_RECONFIG_BUFFER_TIMEOUT_MS))
#define S10_RECONFIG_TIMEOUT (msecs_to_jiffies(SVC_RECONFIG_REQUEST_TIMEOUT_MS))

/*
 * struct s10_svc_buf
 * buf:  virtual address of buf provided by service layer
 * lock: locked if buffer is in use
 */
struct s10_svc_buf {
	char *buf;
	unsigned long lock;
};

struct s10_priv {
	struct stratix10_svc_chan *chan;
	struct stratix10_svc_client client;
	struct completion status_return_completion;
	struct s10_svc_buf svc_bufs[NUM_SVC_BUFS];
	unsigned long status;
};

static int s10_svc_send_msg(struct s10_priv *priv,
			    enum stratix10_svc_command_code command,
			    void *payload, u32 payload_length)
{
	struct stratix10_svc_chan *chan = priv->chan;
	struct device *dev = priv->client.dev;
	struct stratix10_svc_client_msg msg;
	int ret;

	dev_dbg(dev, "%s cmd=%d payload=%p length=%d\n",
		__func__, command, payload, payload_length);

	msg.command = command;
	msg.payload = payload;
	msg.payload_length = payload_length;

	ret = stratix10_svc_send(chan, &msg);
	dev_dbg(dev, "stratix10_svc_send returned status %d\n", ret);

	return ret;
}

/*
 * Free buffers allocated from the service layer's pool that are not in use.
 * Return true when all buffers are freed.
 */
static bool s10_free_buffers(struct fpga_manager *mgr)
{
	struct s10_priv *priv = mgr->priv;
	uint num_free = 0;
	uint i;

	for (i = 0; i < NUM_SVC_BUFS; i++) {
		if (!priv->svc_bufs[i].buf) {
			num_free++;
			continue;
		}

		if (!test_and_set_bit_lock(SVC_BUF_LOCK,
					   &priv->svc_bufs[i].lock)) {
			stratix10_svc_free_memory(priv->chan,
						  priv->svc_bufs[i].buf);
			priv->svc_bufs[i].buf = NULL;
			num_free++;
		}
	}

	return num_free == NUM_SVC_BUFS;
}

/*
 * Returns count of how many buffers are not in use.
 */
static uint s10_free_buffer_count(struct fpga_manager *mgr)
{
	struct s10_priv *priv = mgr->priv;
	uint num_free = 0;
	uint i;

	for (i = 0; i < NUM_SVC_BUFS; i++)
		if (!priv->svc_bufs[i].buf)
			num_free++;

	return num_free;
}

/*
 * s10_unlock_bufs
 * Given the returned buffer address, match that address to our buffer struct
 * and unlock that buffer.  This marks it as available to be refilled and sent
 * (or freed).
 * priv: private data
 * kaddr: kernel address of buffer that was returned from service layer
 */
static void s10_unlock_bufs(struct s10_priv *priv, void *kaddr)
{
	uint i;

	if (!kaddr)
		return;

	for (i = 0; i < NUM_SVC_BUFS; i++)
		if (priv->svc_bufs[i].buf == kaddr) {
			clear_bit_unlock(SVC_BUF_LOCK,
					 &priv->svc_bufs[i].lock);
			return;
		}

	WARN(1, "Unknown buffer returned from service layer %p\n", kaddr);
}

/*
 * s10_receive_callback - callback for service layer to use to provide client
 * (this driver) messages received through the mailbox.
 * client: service layer client struct
 * data: message from service layer
 */
static void s10_receive_callback(struct stratix10_svc_client *client,
				 struct stratix10_svc_cb_data *data)
{
	struct s10_priv *priv = client->priv;
	u32 status;
	int i;

	WARN_ONCE(!data, "%s: stratix10_svc_rc_data = NULL", __func__);

	status = data->status;

	/*
	 * Here we set status bits as we receive them.  Elsewhere, we always use
	 * test_and_clear_bit() to check status in priv->status
	 */
	for (i = 0; i <= SVC_STATUS_RECONFIG_ERROR; i++)
		if (status & (1 << i))
			set_bit(i, &priv->status);

	if (status & BIT(SVC_STATUS_RECONFIG_BUFFER_DONE)) {
		s10_unlock_bufs(priv, data->kaddr1);
		s10_unlock_bufs(priv, data->kaddr2);
		s10_unlock_bufs(priv, data->kaddr3);
	}

	complete(&priv->status_return_completion);
}

/*
 * s10_ops_write_init - prepare for FPGA reconfiguration by requesting
 * partial reconfig and allocating buffers from the service layer.
 */
static int s10_ops_write_init(struct fpga_manager *mgr,
			      struct fpga_image_info *info,
			      const char *buf, size_t count)
{
	struct s10_priv *priv = mgr->priv;
	struct device *dev = priv->client.dev;
	struct stratix10_svc_command_config_type ctype;
	char *kbuf;
	uint i;
	int ret;

	ctype.flags = 0;
	if (info->flags & FPGA_MGR_PARTIAL_RECONFIG) {
		dev_dbg(dev, "Requesting partial reconfiguration.\n");
		ctype.flags |= BIT(COMMAND_RECONFIG_FLAG_PARTIAL);
	} else {
		dev_dbg(dev, "Requesting full reconfiguration.\n");
	}

	reinit_completion(&priv->status_return_completion);
	ret = s10_svc_send_msg(priv, COMMAND_RECONFIG,
			       &ctype, sizeof(ctype));
	if (ret < 0)
		goto init_done;

	ret = wait_for_completion_interruptible_timeout(
		&priv->status_return_completion, S10_RECONFIG_TIMEOUT);
	if (!ret) {
		dev_err(dev, "timeout waiting for RECONFIG_REQUEST\n");
		ret = -ETIMEDOUT;
		goto init_done;
	}
	if (ret < 0) {
		dev_err(dev, "error (%d) waiting for RECONFIG_REQUEST\n", ret);
		goto init_done;
	}

	ret = 0;
	if (!test_and_clear_bit(SVC_STATUS_RECONFIG_REQUEST_OK,
				&priv->status)) {
		ret = -ETIMEDOUT;
		goto init_done;
	}

	/* Allocate buffers from the service layer's pool. */
	for (i = 0; i < NUM_SVC_BUFS; i++) {
		kbuf = stratix10_svc_allocate_memory(priv->chan, SVC_BUF_SIZE);
		if (!kbuf) {
			s10_free_buffers(mgr);
			ret = -ENOMEM;
			goto init_done;
		}

		priv->svc_bufs[i].buf = kbuf;
		priv->svc_bufs[i].lock = 0;
	}

init_done:
	stratix10_svc_done(priv->chan);
	return ret;
}

/*
 * s10_send_buf - send a buffer to the service layer queue
 * mgr: fpga manager struct
 * buf: fpga image buffer
 * count: size of buf in bytes
 * Returns # of bytes transferred or -ENOBUFS if the all the buffers are in use
 * or if the service queue is full. Never returns 0.
 */
static int s10_send_buf(struct fpga_manager *mgr, const char *buf, size_t count)
{
	struct s10_priv *priv = mgr->priv;
	struct device *dev = priv->client.dev;
	void *svc_buf;
	size_t xfer_sz;
	int ret;
	uint i;

	/* get/lock a buffer that that's not being used */
	for (i = 0; i < NUM_SVC_BUFS; i++)
		if (!test_and_set_bit_lock(SVC_BUF_LOCK,
					   &priv->svc_bufs[i].lock))
			break;

	if (i == NUM_SVC_BUFS)
		return -ENOBUFS;

	xfer_sz = count < SVC_BUF_SIZE ? count : SVC_BUF_SIZE;

	svc_buf = priv->svc_bufs[i].buf;
	memcpy(svc_buf, buf, xfer_sz);
	ret = s10_svc_send_msg(priv, COMMAND_RECONFIG_DATA_SUBMIT,
			       svc_buf, xfer_sz);
	if (ret < 0) {
		dev_err(dev,
			"Error while sending data to service layer (%d)", ret);
		clear_bit_unlock(SVC_BUF_LOCK, &priv->svc_bufs[i].lock);
		return ret;
	}

	return xfer_sz;
}

/*
 * Send a FPGA image to privileged layers to write to the FPGA.  When done
 * sending, free all service layer buffers we allocated in write_init.
 */
static int s10_ops_write(struct fpga_manager *mgr, const char *buf,
			 size_t count)
{
	struct s10_priv *priv = mgr->priv;
	struct device *dev = priv->client.dev;
	long wait_status;
	int sent = 0;
	int ret = 0;

	/*
	 * Loop waiting for buffers to be returned.  When a buffer is returned,
	 * reuse it to send more data or free if if all data has been sent.
	 */
	while (count > 0 || s10_free_buffer_count(mgr) != NUM_SVC_BUFS) {
		reinit_completion(&priv->status_return_completion);

		if (count > 0) {
			sent = s10_send_buf(mgr, buf, count);
			if (sent < 0)
				continue;

			count -= sent;
			buf += sent;
		} else {
			if (s10_free_buffers(mgr))
				return 0;

			ret = s10_svc_send_msg(
				priv, COMMAND_RECONFIG_DATA_CLAIM,
				NULL, 0);
			if (ret < 0)
				break;
		}

		/*
		 * If callback hasn't already happened, wait for buffers to be
		 * returned from service layer
		 */
		wait_status = 1; /* not timed out */
		if (!priv->status)
			wait_status = wait_for_completion_interruptible_timeout(
				&priv->status_return_completion,
				S10_BUFFER_TIMEOUT);

		if (test_and_clear_bit(SVC_STATUS_RECONFIG_BUFFER_DONE,
				       &priv->status) ||
		    test_and_clear_bit(SVC_STATUS_RECONFIG_BUFFER_SUBMITTED,
				       &priv->status)) {
			ret = 0;
			continue;
		}

		if (test_and_clear_bit(SVC_STATUS_RECONFIG_ERROR,
				       &priv->status)) {
			dev_err(dev, "ERROR - giving up - SVC_STATUS_RECONFIG_ERROR\n");
			ret = -EFAULT;
			break;
		}

		if (!wait_status) {
			dev_err(dev, "timeout waiting for svc layer buffers\n");
			ret = -ETIMEDOUT;
			break;
		}
		if (wait_status < 0) {
			ret = wait_status;
			dev_err(dev,
				"error (%d) waiting for svc layer buffers\n",
				ret);
			break;
		}
	}

	if (!s10_free_buffers(mgr))
		dev_err(dev, "%s not all buffers were freed\n", __func__);

	return ret;
}

static int s10_ops_write_complete(struct fpga_manager *mgr,
				  struct fpga_image_info *info)
{
	struct s10_priv *priv = mgr->priv;
	struct device *dev = priv->client.dev;
	unsigned long timeout;
	int ret;

	timeout = usecs_to_jiffies(info->config_complete_timeout_us);

	do {
		reinit_completion(&priv->status_return_completion);

		ret = s10_svc_send_msg(priv, COMMAND_RECONFIG_STATUS, NULL, 0);
		if (ret < 0)
			break;

		ret = wait_for_completion_interruptible_timeout(
			&priv->status_return_completion, timeout);
		if (!ret) {
			dev_err(dev,
				"timeout waiting for RECONFIG_COMPLETED\n");
			ret = -ETIMEDOUT;
			break;
		}
		if (ret < 0) {
			dev_err(dev,
				"error (%d) waiting for RECONFIG_COMPLETED\n",
				ret);
			break;
		}
		/* Not error or timeout, so ret is # of jiffies until timeout */
		timeout = ret;
		ret = 0;

		if (test_and_clear_bit(SVC_STATUS_RECONFIG_COMPLETED,
				       &priv->status))
			break;

		if (test_and_clear_bit(SVC_STATUS_RECONFIG_ERROR,
				       &priv->status)) {
			dev_err(dev, "ERROR - giving up - SVC_STATUS_RECONFIG_ERROR\n");
			ret = -EFAULT;
			break;
		}
	} while (1);

	stratix10_svc_done(priv->chan);

	return ret;
}

static enum fpga_mgr_states s10_ops_state(struct fpga_manager *mgr)
{
	return FPGA_MGR_STATE_UNKNOWN;
}

static const struct fpga_manager_ops s10_ops = {
	.state = s10_ops_state,
	.write_init = s10_ops_write_init,
	.write = s10_ops_write,
	.write_complete = s10_ops_write_complete,
};

static int s10_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct s10_priv *priv;
	struct fpga_manager *mgr;
	int ret;

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

	priv->client.dev = dev;
	priv->client.receive_cb = s10_receive_callback;
	priv->client.priv = priv;

	priv->chan = stratix10_svc_request_channel_byname(&priv->client,
							  SVC_CLIENT_FPGA);
	if (IS_ERR(priv->chan)) {
		dev_err(dev, "couldn't get service channel (%s)\n",
			SVC_CLIENT_FPGA);
		return PTR_ERR(priv->chan);
	}

	init_completion(&priv->status_return_completion);

	mgr = fpga_mgr_create(dev, "Stratix10 SOC FPGA Manager",
			      &s10_ops, priv);
	if (!mgr) {
		dev_err(dev, "unable to create FPGA manager\n");
		ret = -ENOMEM;
		goto probe_err;
	}

	ret = fpga_mgr_register(mgr);
	if (ret) {
		dev_err(dev, "unable to register FPGA manager\n");
		fpga_mgr_free(mgr);
		goto probe_err;
	}

	platform_set_drvdata(pdev, mgr);
	return ret;

probe_err:
	stratix10_svc_free_channel(priv->chan);
	return ret;
}

static int s10_remove(struct platform_device *pdev)
{
	struct fpga_manager *mgr = platform_get_drvdata(pdev);
	struct s10_priv *priv = mgr->priv;

	fpga_mgr_unregister(mgr);
	stratix10_svc_free_channel(priv->chan);

	return 0;
}

static const struct of_device_id s10_of_match[] = {
	{ .compatible = "intel,stratix10-soc-fpga-mgr", },
	{},
};

MODULE_DEVICE_TABLE(of, s10_of_match);

static struct platform_driver s10_driver = {
	.probe = s10_probe,
	.remove = s10_remove,
	.driver = {
		.name	= "Stratix10 SoC FPGA manager",
		.of_match_table = of_match_ptr(s10_of_match),
	},
};

static int __init s10_init(void)
{
	struct device_node *fw_np;
	struct device_node *np;
	int ret;

	fw_np = of_find_node_by_name(NULL, "svc");
	if (!fw_np)
		return -ENODEV;

	of_node_get(fw_np);
	np = of_find_matching_node(fw_np, s10_of_match);
	if (!np) {
		of_node_put(fw_np);
		return -ENODEV;
	}

	of_node_put(np);
	ret = of_platform_populate(fw_np, s10_of_match, NULL, NULL);
	of_node_put(fw_np);
	if (ret)
		return ret;

	return platform_driver_register(&s10_driver);
}

static void __exit s10_exit(void)
{
	return platform_driver_unregister(&s10_driver);
}

module_init(s10_init);
module_exit(s10_exit);

MODULE_AUTHOR("Alan Tull <atull@kernel.org>");
MODULE_DESCRIPTION("Intel Stratix 10 SOC FPGA Manager");
MODULE_LICENSE("GPL v2");