aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/e1000_spi.c
blob: aecd290d72939f4a34a6348a85aec0c99e48b0c2 (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
#include <common.h>
#include <console.h>
#include "e1000.h"
#include <linux/compiler.h>

/*-----------------------------------------------------------------------
 * SPI transfer
 *
 * This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks
 * "bitlen" bits in the SPI MISO port.  That's just the way SPI works.
 *
 * The source of the outgoing bits is the "dout" parameter and the
 * destination of the input bits is the "din" parameter.  Note that "dout"
 * and "din" can point to the same memory location, in which case the
 * input data overwrites the output data (since both are buffered by
 * temporary variables, this is OK).
 *
 * This may be interrupted with Ctrl-C if "intr" is true, otherwise it will
 * never return an error.
 */
static int e1000_spi_xfer(struct e1000_hw *hw, unsigned int bitlen,
		const void *dout_mem, void *din_mem, bool intr)
{
	const uint8_t *dout = dout_mem;
	uint8_t *din = din_mem;

	uint8_t mask = 0;
	uint32_t eecd;
	unsigned long i;

	/* Pre-read the control register */
	eecd = E1000_READ_REG(hw, EECD);

	/* Iterate over each bit */
	for (i = 0, mask = 0x80; i < bitlen; i++, mask = (mask >> 1)?:0x80) {
		/* Check for interrupt */
		if (intr && ctrlc())
			return -1;

		/* Determine the output bit */
		if (dout && dout[i >> 3] & mask)
			eecd |=  E1000_EECD_DI;
		else
			eecd &= ~E1000_EECD_DI;

		/* Write the output bit and wait 50us */
		E1000_WRITE_REG(hw, EECD, eecd);
		E1000_WRITE_FLUSH(hw);
		udelay(50);

		/* Poke the clock (waits 50us) */
		e1000_raise_ee_clk(hw, &eecd);

		/* Now read the input bit */
		eecd = E1000_READ_REG(hw, EECD);
		if (din) {
			if (eecd & E1000_EECD_DO)
				din[i >> 3] |=  mask;
			else
				din[i >> 3] &= ~mask;
		}

		/* Poke the clock again (waits 50us) */
		e1000_lower_ee_clk(hw, &eecd);
	}

	/* Now clear any remaining bits of the input */
	if (din && (i & 7))
		din[i >> 3] &= ~((mask << 1) - 1);

	return 0;
}

#ifdef CONFIG_E1000_SPI_GENERIC
static inline struct e1000_hw *e1000_hw_from_spi(struct spi_slave *spi)
{
	return container_of(spi, struct e1000_hw, spi);
}

struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
		unsigned int max_hz, unsigned int mode)
{
	/* Find the right PCI device */
	struct e1000_hw *hw = e1000_find_card(bus);
	if (!hw) {
		printf("ERROR: No such e1000 device: e1000#%u\n", bus);
		return NULL;
	}

	/* Make sure it has an SPI chip */
	if (hw->eeprom.type != e1000_eeprom_spi) {
		E1000_ERR(hw, "No attached SPI EEPROM found!\n");
		return NULL;
	}

	/* Argument sanity checks */
	if (cs != 0) {
		E1000_ERR(hw, "No such SPI chip: %u\n", cs);
		return NULL;
	}
	if (mode != SPI_MODE_0) {
		E1000_ERR(hw, "Only SPI MODE-0 is supported!\n");
		return NULL;
	}

	/* TODO: Use max_hz somehow */
	E1000_DBG(hw->nic, "EEPROM SPI access requested\n");
	return &hw->spi;
}

void spi_free_slave(struct spi_slave *spi)
{
	__maybe_unused struct e1000_hw *hw = e1000_hw_from_spi(spi);
	E1000_DBG(hw->nic, "EEPROM SPI access released\n");
}

int spi_claim_bus(struct spi_slave *spi)
{
	struct e1000_hw *hw = e1000_hw_from_spi(spi);

	if (e1000_acquire_eeprom(hw)) {
		E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
		return -1;
	}

	return 0;
}

void spi_release_bus(struct spi_slave *spi)
{
	struct e1000_hw *hw = e1000_hw_from_spi(spi);
	e1000_release_eeprom(hw);
}

/* Skinny wrapper around e1000_spi_xfer */
int spi_xfer(struct spi_slave *spi, unsigned int bitlen,
		const void *dout_mem, void *din_mem, unsigned long flags)
{
	struct e1000_hw *hw = e1000_hw_from_spi(spi);
	int ret;

	if (flags & SPI_XFER_BEGIN)
		e1000_standby_eeprom(hw);

	ret = e1000_spi_xfer(hw, bitlen, dout_mem, din_mem, true);

	if (flags & SPI_XFER_END)
		e1000_standby_eeprom(hw);

	return ret;
}

#endif /* not CONFIG_E1000_SPI_GENERIC */

#ifdef CONFIG_CMD_E1000

/* The EEPROM opcodes */
#define SPI_EEPROM_ENABLE_WR	0x06
#define SPI_EEPROM_DISABLE_WR	0x04
#define SPI_EEPROM_WRITE_STATUS	0x01
#define SPI_EEPROM_READ_STATUS	0x05
#define SPI_EEPROM_WRITE_PAGE	0x02
#define SPI_EEPROM_READ_PAGE	0x03

/* The EEPROM status bits */
#define SPI_EEPROM_STATUS_BUSY	0x01
#define SPI_EEPROM_STATUS_WREN	0x02

static int e1000_spi_eeprom_enable_wr(struct e1000_hw *hw, bool intr)
{
	u8 op[] = { SPI_EEPROM_ENABLE_WR };
	e1000_standby_eeprom(hw);
	return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
}

/*
 * These have been tested to perform correctly, but they are not used by any
 * of the EEPROM commands at this time.
 */
static __maybe_unused int e1000_spi_eeprom_disable_wr(struct e1000_hw *hw,
						      bool intr)
{
	u8 op[] = { SPI_EEPROM_DISABLE_WR };
	e1000_standby_eeprom(hw);
	return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
}

static __maybe_unused int e1000_spi_eeprom_write_status(struct e1000_hw *hw,
							u8 status, bool intr)
{
	u8 op[] = { SPI_EEPROM_WRITE_STATUS, status };
	e1000_standby_eeprom(hw);
	return e1000_spi_xfer(hw, 8*sizeof(op), op, NULL, intr);
}

static int e1000_spi_eeprom_read_status(struct e1000_hw *hw, bool intr)
{
	u8 op[] = { SPI_EEPROM_READ_STATUS, 0 };
	e1000_standby_eeprom(hw);
	if (e1000_spi_xfer(hw, 8*sizeof(op), op, op, intr))
		return -1;
	return op[1];
}

static int e1000_spi_eeprom_write_page(struct e1000_hw *hw,
		const void *data, u16 off, u16 len, bool intr)
{
	u8 op[] = {
		SPI_EEPROM_WRITE_PAGE,
		(off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff
	};

	e1000_standby_eeprom(hw);

	if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr))
		return -1;
	if (e1000_spi_xfer(hw, len << 3, data, NULL, intr))
		return -1;

	return 0;
}

static int e1000_spi_eeprom_read_page(struct e1000_hw *hw,
		void *data, u16 off, u16 len, bool intr)
{
	u8 op[] = {
		SPI_EEPROM_READ_PAGE,
		(off >> (hw->eeprom.address_bits - 8)) & 0xff, off & 0xff
	};

	e1000_standby_eeprom(hw);

	if (e1000_spi_xfer(hw, 8 + hw->eeprom.address_bits, op, NULL, intr))
		return -1;
	if (e1000_spi_xfer(hw, len << 3, NULL, data, intr))
		return -1;

	return 0;
}

static int e1000_spi_eeprom_poll_ready(struct e1000_hw *hw, bool intr)
{
	int status;
	while ((status = e1000_spi_eeprom_read_status(hw, intr)) >= 0) {
		if (!(status & SPI_EEPROM_STATUS_BUSY))
			return 0;
	}
	return -1;
}

static int e1000_spi_eeprom_dump(struct e1000_hw *hw,
		void *data, u16 off, unsigned int len, bool intr)
{
	/* Interruptibly wait for the EEPROM to be ready */
	if (e1000_spi_eeprom_poll_ready(hw, intr))
		return -1;

	/* Dump each page in sequence */
	while (len) {
		/* Calculate the data bytes on this page */
		u16 pg_off = off & (hw->eeprom.page_size - 1);
		u16 pg_len = hw->eeprom.page_size - pg_off;
		if (pg_len > len)
			pg_len = len;

		/* Now dump the page */
		if (e1000_spi_eeprom_read_page(hw, data, off, pg_len, intr))
			return -1;

		/* Otherwise go on to the next page */
		len  -= pg_len;
		off  += pg_len;
		data += pg_len;
	}

	/* We're done! */
	return 0;
}

static int e1000_spi_eeprom_program(struct e1000_hw *hw,
		const void *data, u16 off, u16 len, bool intr)
{
	/* Program each page in sequence */
	while (len) {
		/* Calculate the data bytes on this page */
		u16 pg_off = off & (hw->eeprom.page_size - 1);
		u16 pg_len = hw->eeprom.page_size - pg_off;
		if (pg_len > len)
			pg_len = len;

		/* Interruptibly wait for the EEPROM to be ready */
		if (e1000_spi_eeprom_poll_ready(hw, intr))
			return -1;

		/* Enable write access */
		if (e1000_spi_eeprom_enable_wr(hw, intr))
			return -1;

		/* Now program the page */
		if (e1000_spi_eeprom_write_page(hw, data, off, pg_len, intr))
			return -1;

		/* Otherwise go on to the next page */
		len  -= pg_len;
		off  += pg_len;
		data += pg_len;
	}

	/* Wait for the last write to complete */
	if (e1000_spi_eeprom_poll_ready(hw, intr))
		return -1;

	/* We're done! */
	return 0;
}

static int do_e1000_spi_show(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
		int argc, char * const argv[])
{
	unsigned int length = 0;
	u16 i, offset = 0;
	u8 *buffer;
	int err;

	if (argc > 2) {
		cmd_usage(cmdtp);
		return 1;
	}

	/* Parse the offset and length */
	if (argc >= 1)
		offset = simple_strtoul(argv[0], NULL, 0);
	if (argc == 2)
		length = simple_strtoul(argv[1], NULL, 0);
	else if (offset < (hw->eeprom.word_size << 1))
		length = (hw->eeprom.word_size << 1) - offset;

	/* Extra sanity checks */
	if (!length) {
		E1000_ERR(hw, "Requested zero-sized dump!\n");
		return 1;
	}
	if ((0x10000 < length) || (0x10000 - length < offset)) {
		E1000_ERR(hw, "Can't dump past 0xFFFF!\n");
		return 1;
	}

	/* Allocate a buffer to hold stuff */
	buffer = malloc(length);
	if (!buffer) {
		E1000_ERR(hw, "Out of Memory!\n");
		return 1;
	}

	/* Acquire the EEPROM and perform the dump */
	if (e1000_acquire_eeprom(hw)) {
		E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
		free(buffer);
		return 1;
	}
	err = e1000_spi_eeprom_dump(hw, buffer, offset, length, true);
	e1000_release_eeprom(hw);
	if (err) {
		E1000_ERR(hw, "Interrupted!\n");
		free(buffer);
		return 1;
	}

	/* Now hexdump the result */
	printf("%s: ===== Intel e1000 EEPROM (0x%04hX - 0x%04hX) =====",
			hw->name, offset, offset + length - 1);
	for (i = 0; i < length; i++) {
		if ((i & 0xF) == 0)
			printf("\n%s: %04hX: ", hw->name, offset + i);
		else if ((i & 0xF) == 0x8)
			printf(" ");
		printf(" %02hx", buffer[i]);
	}
	printf("\n");

	/* Success! */
	free(buffer);
	return 0;
}

static int do_e1000_spi_dump(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
		int argc, char * const argv[])
{
	unsigned int length;
	u16 offset;
	void *dest;

	if (argc != 3) {
		cmd_usage(cmdtp);
		return 1;
	}

	/* Parse the arguments */
	dest = (void *)simple_strtoul(argv[0], NULL, 16);
	offset = simple_strtoul(argv[1], NULL, 0);
	length = simple_strtoul(argv[2], NULL, 0);

	/* Extra sanity checks */
	if (!length) {
		E1000_ERR(hw, "Requested zero-sized dump!\n");
		return 1;
	}
	if ((0x10000 < length) || (0x10000 - length < offset)) {
		E1000_ERR(hw, "Can't dump past 0xFFFF!\n");
		return 1;
	}

	/* Acquire the EEPROM */
	if (e1000_acquire_eeprom(hw)) {
		E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
		return 1;
	}

	/* Perform the programming operation */
	if (e1000_spi_eeprom_dump(hw, dest, offset, length, true) < 0) {
		E1000_ERR(hw, "Interrupted!\n");
		e1000_release_eeprom(hw);
		return 1;
	}

	e1000_release_eeprom(hw);
	printf("%s: ===== EEPROM DUMP COMPLETE =====\n", hw->name);
	return 0;
}

static int do_e1000_spi_program(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
		int argc, char * const argv[])
{
	unsigned int length;
	const void *source;
	u16 offset;

	if (argc != 3) {
		cmd_usage(cmdtp);
		return 1;
	}

	/* Parse the arguments */
	source = (const void *)simple_strtoul(argv[0], NULL, 16);
	offset = simple_strtoul(argv[1], NULL, 0);
	length = simple_strtoul(argv[2], NULL, 0);

	/* Acquire the EEPROM */
	if (e1000_acquire_eeprom(hw)) {
		E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
		return 1;
	}

	/* Perform the programming operation */
	if (e1000_spi_eeprom_program(hw, source, offset, length, true) < 0) {
		E1000_ERR(hw, "Interrupted!\n");
		e1000_release_eeprom(hw);
		return 1;
	}

	e1000_release_eeprom(hw);
	printf("%s: ===== EEPROM PROGRAMMED =====\n", hw->name);
	return 0;
}

static int do_e1000_spi_checksum(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
		int argc, char * const argv[])
{
	uint16_t i, length, checksum = 0, checksum_reg;
	uint16_t *buffer;
	bool upd;

	if (argc == 0)
		upd = 0;
	else if ((argc == 1) && !strcmp(argv[0], "update"))
		upd = 1;
	else {
		cmd_usage(cmdtp);
		return 1;
	}

	/* Allocate a temporary buffer */
	length = sizeof(uint16_t) * (EEPROM_CHECKSUM_REG + 1);
	buffer = malloc(length);
	if (!buffer) {
		E1000_ERR(hw, "Unable to allocate EEPROM buffer!\n");
		return 1;
	}

	/* Acquire the EEPROM */
	if (e1000_acquire_eeprom(hw)) {
		E1000_ERR(hw, "EEPROM SPI cannot be acquired!\n");
		return 1;
	}

	/* Read the EEPROM */
	if (e1000_spi_eeprom_dump(hw, buffer, 0, length, true) < 0) {
		E1000_ERR(hw, "Interrupted!\n");
		e1000_release_eeprom(hw);
		return 1;
	}

	/* Compute the checksum and read the expected value */
	for (i = 0; i < EEPROM_CHECKSUM_REG; i++)
		checksum += le16_to_cpu(buffer[i]);
	checksum = ((uint16_t)EEPROM_SUM) - checksum;
	checksum_reg = le16_to_cpu(buffer[i]);

	/* Verify it! */
	if (checksum_reg == checksum) {
		printf("%s: INFO: EEPROM checksum is correct! (0x%04hx)\n",
				hw->name, checksum);
		e1000_release_eeprom(hw);
		return 0;
	}

	/* Hrm, verification failed, print an error */
	E1000_ERR(hw, "EEPROM checksum is incorrect!\n");
	E1000_ERR(hw, "  ...register was 0x%04hx, calculated 0x%04hx\n",
		  checksum_reg, checksum);

	/* If they didn't ask us to update it, just return an error */
	if (!upd) {
		e1000_release_eeprom(hw);
		return 1;
	}

	/* Ok, correct it! */
	printf("%s: Reprogramming the EEPROM checksum...\n", hw->name);
	buffer[i] = cpu_to_le16(checksum);
	if (e1000_spi_eeprom_program(hw, &buffer[i], i * sizeof(uint16_t),
			sizeof(uint16_t), true)) {
		E1000_ERR(hw, "Interrupted!\n");
		e1000_release_eeprom(hw);
		return 1;
	}

	e1000_release_eeprom(hw);
	return 0;
}

int do_e1000_spi(cmd_tbl_t *cmdtp, struct e1000_hw *hw,
		int argc, char * const argv[])
{
	if (argc < 1) {
		cmd_usage(cmdtp);
		return 1;
	}

	/* Make sure it has an SPI chip */
	if (hw->eeprom.type != e1000_eeprom_spi) {
		E1000_ERR(hw, "No attached SPI EEPROM found (%d)!\n",
			  hw->eeprom.type);
		return 1;
	}

	/* Check the eeprom sub-sub-command arguments */
	if (!strcmp(argv[0], "show"))
		return do_e1000_spi_show(cmdtp, hw, argc - 1, argv + 1);

	if (!strcmp(argv[0], "dump"))
		return do_e1000_spi_dump(cmdtp, hw, argc - 1, argv + 1);

	if (!strcmp(argv[0], "program"))
		return do_e1000_spi_program(cmdtp, hw, argc - 1, argv + 1);

	if (!strcmp(argv[0], "checksum"))
		return do_e1000_spi_checksum(cmdtp, hw, argc - 1, argv + 1);

	cmd_usage(cmdtp);
	return 1;
}

#endif /* not CONFIG_CMD_E1000 */