summaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci-pci-renesas.c
blob: 59b1965ad0a3f1f17c3d7d50306f60240eec331d (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
632
633
634
635
636
637
638
639
640
641
642
643
644
645
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2019-2020 Linaro Limited */

#include <linux/acpi.h>
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <asm/unaligned.h>

#include "xhci.h"
#include "xhci-trace.h"
#include "xhci-pci.h"

#define RENESAS_FW_VERSION				0x6C
#define RENESAS_ROM_CONFIG				0xF0
#define RENESAS_FW_STATUS				0xF4
#define RENESAS_FW_STATUS_MSB				0xF5
#define RENESAS_ROM_STATUS				0xF6
#define RENESAS_ROM_STATUS_MSB				0xF7
#define RENESAS_DATA0					0xF8
#define RENESAS_DATA1					0xFC

#define RENESAS_FW_VERSION_FIELD			GENMASK(23, 7)
#define RENESAS_FW_VERSION_OFFSET			8

#define RENESAS_FW_STATUS_DOWNLOAD_ENABLE		BIT(0)
#define RENESAS_FW_STATUS_LOCK				BIT(1)
#define RENESAS_FW_STATUS_RESULT			GENMASK(6, 4)
  #define RENESAS_FW_STATUS_INVALID			0
  #define RENESAS_FW_STATUS_SUCCESS			BIT(4)
  #define RENESAS_FW_STATUS_ERROR			BIT(5)
#define RENESAS_FW_STATUS_SET_DATA0			BIT(8)
#define RENESAS_FW_STATUS_SET_DATA1			BIT(9)

#define RENESAS_ROM_STATUS_ACCESS			BIT(0)
#define RENESAS_ROM_STATUS_ERASE			BIT(1)
#define RENESAS_ROM_STATUS_RELOAD			BIT(2)
#define RENESAS_ROM_STATUS_RESULT			GENMASK(6, 4)
  #define RENESAS_ROM_STATUS_NO_RESULT			0
  #define RENESAS_ROM_STATUS_SUCCESS			BIT(4)
  #define RENESAS_ROM_STATUS_ERROR			BIT(5)
#define RENESAS_ROM_STATUS_SET_DATA0			BIT(8)
#define RENESAS_ROM_STATUS_SET_DATA1			BIT(9)
#define RENESAS_ROM_STATUS_ROM_EXISTS			BIT(15)

#define RENESAS_ROM_ERASE_MAGIC				0x5A65726F
#define RENESAS_ROM_WRITE_MAGIC				0x53524F4D

#define RENESAS_RETRY	10000
#define RENESAS_DELAY	10

#define ROM_VALID_01 0x2013
#define ROM_VALID_02 0x2026

static int renesas_verify_fw_version(struct pci_dev *pdev, u32 version)
{
	switch (version) {
	case ROM_VALID_01:
	case ROM_VALID_02:
		return 0;
	}
	dev_err(&pdev->dev, "FW has invalid version :%d\n", version);
	return -EINVAL;
}

static int renesas_fw_download_image(struct pci_dev *dev,
				     const u32 *fw, size_t step, bool rom)
{
	size_t i;
	int err;
	u8 fw_status;
	bool data0_or_data1;
	u32 status_reg;

	if (rom)
		status_reg = RENESAS_ROM_STATUS_MSB;
	else
		status_reg = RENESAS_FW_STATUS_MSB;

	/*
	 * The hardware does alternate between two 32-bit pages.
	 * (This is because each row of the firmware is 8 bytes).
	 *
	 * for even steps we use DATA0, for odd steps DATA1.
	 */
	data0_or_data1 = (step & 1) == 1;

	/* step+1. Read "Set DATAX" and confirm it is cleared. */
	for (i = 0; i < RENESAS_RETRY; i++) {
		err = pci_read_config_byte(dev, status_reg, &fw_status);
		if (err) {
			dev_err(&dev->dev, "Read Status failed: %d\n",
				pcibios_err_to_errno(err));
			return pcibios_err_to_errno(err);
		}
		if (!(fw_status & BIT(data0_or_data1)))
			break;

		udelay(RENESAS_DELAY);
	}
	if (i == RENESAS_RETRY) {
		dev_err(&dev->dev, "Timeout for Set DATAX step: %zd\n", step);
		return -ETIMEDOUT;
	}

	/*
	 * step+2. Write FW data to "DATAX".
	 * "LSB is left" => force little endian
	 */
	err = pci_write_config_dword(dev, data0_or_data1 ?
				     RENESAS_DATA1 : RENESAS_DATA0,
				     (__force u32)cpu_to_le32(fw[step]));
	if (err) {
		dev_err(&dev->dev, "Write to DATAX failed: %d\n",
			pcibios_err_to_errno(err));
		return pcibios_err_to_errno(err);
	}

	udelay(100);

	/* step+3. Set "Set DATAX". */
	err = pci_write_config_byte(dev, status_reg, BIT(data0_or_data1));
	if (err) {
		dev_err(&dev->dev, "Write config for DATAX failed: %d\n",
			pcibios_err_to_errno(err));
		return pcibios_err_to_errno(err);
	}

	return 0;
}

static int renesas_fw_verify(const void *fw_data,
			     size_t length)
{
	u16 fw_version_pointer;
	u16 fw_version;

	/*
	 * The Firmware's Data Format is describe in
	 * "6.3 Data Format" R19UH0078EJ0500 Rev.5.00 page 124
	 */

	/*
	 * The bootrom chips of the big brother have sizes up to 64k, let's
	 * assume that's the biggest the firmware can get.
	 */
	if (length < 0x1000 || length >= 0x10000) {
		pr_err("firmware is size %zd is not (4k - 64k).",
			length);
		return -EINVAL;
	}

	/* The First 2 bytes are fixed value (55aa). "LSB on Left" */
	if (get_unaligned_le16(fw_data) != 0x55aa) {
		pr_err("no valid firmware header found.");
		return -EINVAL;
	}

	/* verify the firmware version position and print it. */
	fw_version_pointer = get_unaligned_le16(fw_data + 4);
	if (fw_version_pointer + 2 >= length) {
		pr_err("fw ver pointer is outside of the firmware image");
		return -EINVAL;
	}

	fw_version = get_unaligned_le16(fw_data + fw_version_pointer);
	pr_err("got firmware version: %02x.", fw_version);

	return 0;
}

static bool renesas_check_rom(struct pci_dev *pdev)
{
	u16 rom_status;
	int retval;

	/* Check if external ROM exists */
	retval = pci_read_config_word(pdev, RENESAS_ROM_STATUS, &rom_status);
	if (retval)
		return false;

	rom_status &= RENESAS_ROM_STATUS_ROM_EXISTS;
	if (rom_status) {
		dev_dbg(&pdev->dev, "External ROM exists\n");
		return true; /* External ROM exists */
	}

	return false;
}

static int renesas_check_rom_state(struct pci_dev *pdev)
{
	u16 rom_state;
	u32 version;
	int err;

	/* check FW version */
	err = pci_read_config_dword(pdev, RENESAS_FW_VERSION, &version);
	if (err)
		return pcibios_err_to_errno(err);

	version &= RENESAS_FW_VERSION_FIELD;
	version = version >> RENESAS_FW_VERSION_OFFSET;

	err = renesas_verify_fw_version(pdev, version);
	if (err)
		return err;

	/*
	 * Test if ROM is present and loaded, if so we can skip everything
	 */
	err = pci_read_config_word(pdev, RENESAS_ROM_STATUS, &rom_state);
	if (err)
		return pcibios_err_to_errno(err);

	if (rom_state & BIT(15)) {
		/* ROM exists */
		dev_dbg(&pdev->dev, "ROM exists\n");

		/* Check the "Result Code" Bits (6:4) and act accordingly */
		switch (rom_state & RENESAS_ROM_STATUS_RESULT) {
		case RENESAS_ROM_STATUS_SUCCESS:
			return 0;

		case RENESAS_ROM_STATUS_NO_RESULT: /* No result yet */
			return 0;

		case RENESAS_ROM_STATUS_ERROR: /* Error State */
		default: /* All other states are marked as "Reserved states" */
			dev_err(&pdev->dev, "Invalid ROM..");
			break;
		}
	}

	return -EIO;
}

static int renesas_fw_check_running(struct pci_dev *pdev)
{
	u8 fw_state;
	int err;

	/* Check if device has ROM and loaded, if so skip everything */
	err = renesas_check_rom(pdev);
	if (err) { /* we have rom */
		err = renesas_check_rom_state(pdev);
		if (!err)
			return err;
	}

	/*
	 * Test if the device is actually needing the firmware. As most
	 * BIOSes will initialize the device for us. If the device is
	 * initialized.
	 */
	err = pci_read_config_byte(pdev, RENESAS_FW_STATUS, &fw_state);
	if (err)
		return pcibios_err_to_errno(err);

	/*
	 * Check if "FW Download Lock" is locked. If it is and the FW is
	 * ready we can simply continue. If the FW is not ready, we have
	 * to give up.
	 */
	if (fw_state & RENESAS_FW_STATUS_LOCK) {
		dev_dbg(&pdev->dev, "FW Download Lock is engaged.");

		if (fw_state & RENESAS_FW_STATUS_SUCCESS)
			return 0;

		dev_err(&pdev->dev,
			"FW Download Lock is set and FW is not ready. Giving Up.");
		return -EIO;
	}

	/*
	 * Check if "FW Download Enable" is set. If someone (us?) tampered
	 * with it and it can't be reset, we have to give up too... and
	 * ask for a forgiveness and a reboot.
	 */
	if (fw_state & RENESAS_FW_STATUS_DOWNLOAD_ENABLE) {
		dev_err(&pdev->dev,
			"FW Download Enable is stale. Giving Up (poweroff/reboot needed).");
		return -EIO;
	}

	/* Otherwise, Check the "Result Code" Bits (6:4) and act accordingly */
	switch (fw_state & RENESAS_FW_STATUS_RESULT) {
	case 0: /* No result yet */
		dev_dbg(&pdev->dev, "FW is not ready/loaded yet.");

		/* tell the caller, that this device needs the firmware. */
		return 1;

	case RENESAS_FW_STATUS_SUCCESS: /* Success, device should be working. */
		dev_dbg(&pdev->dev, "FW is ready.");
		return 0;

	case RENESAS_FW_STATUS_ERROR: /* Error State */
		dev_err(&pdev->dev,
			"hardware is in an error state. Giving up (poweroff/reboot needed).");
		return -ENODEV;

	default: /* All other states are marked as "Reserved states" */
		dev_err(&pdev->dev,
			"hardware is in an invalid state %lx. Giving up (poweroff/reboot needed).",
			(fw_state & RENESAS_FW_STATUS_RESULT) >> 4);
		return -EINVAL;
	}
}

static int renesas_fw_download(struct pci_dev *pdev,
			       const struct firmware *fw)
{
	const u32 *fw_data = (const u32 *)fw->data;
	size_t i;
	int err;
	u8 fw_status;

	/*
	 * For more information and the big picture: please look at the
	 * "Firmware Download Sequence" in "7.1 FW Download Interface"
	 * of R19UH0078EJ0500 Rev.5.00 page 131
	 */

	/*
	 * 0. Set "FW Download Enable" bit in the
	 * "FW Download Control & Status Register" at 0xF4
	 */
	err = pci_write_config_byte(pdev, RENESAS_FW_STATUS,
				    RENESAS_FW_STATUS_DOWNLOAD_ENABLE);
	if (err)
		return pcibios_err_to_errno(err);

	/* 1 - 10 follow one step after the other. */
	for (i = 0; i < fw->size / 4; i++) {
		err = renesas_fw_download_image(pdev, fw_data, i, false);
		if (err) {
			dev_err(&pdev->dev,
				"Firmware Download Step %zd failed at position %zd bytes with (%d).",
				i, i * 4, err);
			return err;
		}
	}

	/*
	 * This sequence continues until the last data is written to
	 * "DATA0" or "DATA1". Naturally, we wait until "SET DATA0/1"
	 * is cleared by the hardware beforehand.
	 */
	for (i = 0; i < RENESAS_RETRY; i++) {
		err = pci_read_config_byte(pdev, RENESAS_FW_STATUS_MSB,
					   &fw_status);
		if (err)
			return pcibios_err_to_errno(err);
		if (!(fw_status & (BIT(0) | BIT(1))))
			break;

		udelay(RENESAS_DELAY);
	}
	if (i == RENESAS_RETRY)
		dev_warn(&pdev->dev, "Final Firmware Download step timed out.");

	/*
	 * 11. After finishing writing the last data of FW, the
	 * System Software must clear "FW Download Enable"
	 */
	err = pci_write_config_byte(pdev, RENESAS_FW_STATUS, 0);
	if (err)
		return pcibios_err_to_errno(err);

	/* 12. Read "Result Code" and confirm it is good. */
	for (i = 0; i < RENESAS_RETRY; i++) {
		err = pci_read_config_byte(pdev, RENESAS_FW_STATUS, &fw_status);
		if (err)
			return pcibios_err_to_errno(err);
		if (fw_status & RENESAS_FW_STATUS_SUCCESS)
			break;

		udelay(RENESAS_DELAY);
	}
	if (i == RENESAS_RETRY) {
		/* Timed out / Error - let's see if we can fix this */
		err = renesas_fw_check_running(pdev);
		switch (err) {
		case 0: /*
			 * we shouldn't end up here.
			 * maybe it took a little bit longer.
			 * But all should be well?
			 */
			break;

		case 1: /* (No result yet! */
			dev_err(&pdev->dev, "FW Load timedout");
			return -ETIMEDOUT;

		default:
			return err;
		}
	}

	return 0;
}

static void renesas_rom_erase(struct pci_dev *pdev)
{
	int retval, i;
	u8 status;

	dev_dbg(&pdev->dev, "Performing ROM Erase...\n");
	retval = pci_write_config_dword(pdev, RENESAS_DATA0,
					RENESAS_ROM_ERASE_MAGIC);
	if (retval) {
		dev_err(&pdev->dev, "ROM erase, magic word write failed: %d\n",
			pcibios_err_to_errno(retval));
		return;
	}

	retval = pci_read_config_byte(pdev, RENESAS_ROM_STATUS, &status);
	if (retval) {
		dev_err(&pdev->dev, "ROM status read failed: %d\n",
			pcibios_err_to_errno(retval));
		return;
	}
	status |= RENESAS_ROM_STATUS_ERASE;
	retval = pci_write_config_byte(pdev, RENESAS_ROM_STATUS, status);
	if (retval) {
		dev_err(&pdev->dev, "ROM erase set word write failed\n");
		return;
	}

	/* sleep a bit while ROM is erased */
	msleep(20);

	for (i = 0; i < RENESAS_RETRY; i++) {
		retval = pci_read_config_byte(pdev, RENESAS_ROM_STATUS,
					      &status);
		status &= RENESAS_ROM_STATUS_ERASE;
		if (!status)
			break;

		mdelay(RENESAS_DELAY);
	}

	if (i == RENESAS_RETRY)
		dev_dbg(&pdev->dev, "Chip erase timedout: %x\n", status);

	dev_dbg(&pdev->dev, "ROM Erase... Done success\n");
}

static bool renesas_setup_rom(struct pci_dev *pdev, const struct firmware *fw)
{
	const u32 *fw_data = (const u32 *)fw->data;
	int err, i;
	u8 status;

	/* 2. Write magic word to Data0 */
	err = pci_write_config_dword(pdev, RENESAS_DATA0,
				     RENESAS_ROM_WRITE_MAGIC);
	if (err)
		return false;

	/* 3. Set External ROM access */
	err = pci_write_config_byte(pdev, RENESAS_ROM_STATUS,
				    RENESAS_ROM_STATUS_ACCESS);
	if (err)
		goto remove_bypass;

	/* 4. Check the result */
	err = pci_read_config_byte(pdev, RENESAS_ROM_STATUS, &status);
	if (err)
		goto remove_bypass;
	status &= GENMASK(6, 4);
	if (status) {
		dev_err(&pdev->dev,
			"setting external rom failed: %x\n", status);
		goto remove_bypass;
	}

	/* 5 to 16 Write FW to DATA0/1 while checking SetData0/1 */
	for (i = 0; i < fw->size / 4; i++) {
		err = renesas_fw_download_image(pdev, fw_data, i, true);
		if (err) {
			dev_err(&pdev->dev,
				"ROM Download Step %d failed at position %d bytes with (%d)\n",
				 i, i * 4, err);
			goto remove_bypass;
		}
	}

	/*
	 * wait till DATA0/1 is cleared
	 */
	for (i = 0; i < RENESAS_RETRY; i++) {
		err = pci_read_config_byte(pdev, RENESAS_ROM_STATUS_MSB,
					   &status);
		if (err)
			goto remove_bypass;
		if (!(status & (BIT(0) | BIT(1))))
			break;

		udelay(RENESAS_DELAY);
	}
	if (i == RENESAS_RETRY) {
		dev_err(&pdev->dev, "Final Firmware ROM Download step timed out\n");
		goto remove_bypass;
	}

	/* 17. Remove bypass */
	err = pci_write_config_byte(pdev, RENESAS_ROM_STATUS, 0);
	if (err)
		return false;

	udelay(10);

	/* 18. check result */
	for (i = 0; i < RENESAS_RETRY; i++) {
		err = pci_read_config_byte(pdev, RENESAS_ROM_STATUS, &status);
		if (err) {
			dev_err(&pdev->dev, "Read ROM status failed:%d\n",
				pcibios_err_to_errno(err));
			return false;
		}
		status &= RENESAS_ROM_STATUS_RESULT;
		if (status ==  RENESAS_ROM_STATUS_SUCCESS) {
			dev_dbg(&pdev->dev, "Download ROM success\n");
			break;
		}
		udelay(RENESAS_DELAY);
	}
	if (i == RENESAS_RETRY) { /* Timed out */
		dev_err(&pdev->dev,
			"Download to external ROM TO: %x\n", status);
		return false;
	}

	dev_dbg(&pdev->dev, "Download to external ROM succeeded\n");

	/* Last step set Reload */
	err = pci_write_config_byte(pdev, RENESAS_ROM_STATUS,
				    RENESAS_ROM_STATUS_RELOAD);
	if (err) {
		dev_err(&pdev->dev, "Set ROM execute failed: %d\n",
			pcibios_err_to_errno(err));
		return false;
	}

	/*
	 * wait till Reload is cleared
	 */
	for (i = 0; i < RENESAS_RETRY; i++) {
		err = pci_read_config_byte(pdev, RENESAS_ROM_STATUS, &status);
		if (err)
			return false;
		if (!(status & RENESAS_ROM_STATUS_RELOAD))
			break;

		udelay(RENESAS_DELAY);
	}
	if (i == RENESAS_RETRY) {
		dev_err(&pdev->dev, "ROM Exec timed out: %x\n", status);
		return false;
	}

	return true;

remove_bypass:
	pci_write_config_byte(pdev, RENESAS_ROM_STATUS, 0);
	return false;
}

static int renesas_load_fw(struct pci_dev *pdev, const struct firmware *fw)
{
	int err = 0;
	bool rom;

	/* Check if the device has external ROM */
	rom = renesas_check_rom(pdev);
	if (rom) {
		/* perform chip erase first */
		renesas_rom_erase(pdev);

		/* lets try loading fw on ROM first */
		rom = renesas_setup_rom(pdev, fw);
		if (!rom) {
			dev_dbg(&pdev->dev,
				"ROM load failed, falling back on FW load\n");
		} else {
			dev_dbg(&pdev->dev,
				"ROM load success\n");
			goto exit;
		}
	}

	err = renesas_fw_download(pdev, fw);

exit:
	if (err)
		dev_err(&pdev->dev, "firmware failed to download (%d).", err);
	return err;
}

int renesas_xhci_check_request_fw(struct pci_dev *pdev,
				  const struct pci_device_id *id)
{
	struct xhci_driver_data *driver_data =
			(struct xhci_driver_data *)id->driver_data;
	const char *fw_name = driver_data->firmware;
	const struct firmware *fw;
	int err;

	err = renesas_fw_check_running(pdev);
	/* Continue ahead, if the firmware is already running. */
	if (err == 0)
		return 0;

	if (err != 1)
		return err;

	pci_dev_get(pdev);
	err = request_firmware(&fw, fw_name, &pdev->dev);
	pci_dev_put(pdev);
	if (err) {
		dev_err(&pdev->dev, "request_firmware failed: %d\n", err);
		return err;
	}

	err = renesas_fw_verify(fw->data, fw->size);
	if (err)
		goto exit;

	err = renesas_load_fw(pdev, fw);
exit:
	release_firmware(fw);
	return err;
}
EXPORT_SYMBOL_GPL(renesas_xhci_check_request_fw);

void renesas_xhci_pci_exit(struct pci_dev *dev)
{
}
EXPORT_SYMBOL_GPL(renesas_xhci_pci_exit);

MODULE_LICENSE("GPL v2");