summaryrefslogtreecommitdiffstats
path: root/drivers/net/ethernet/wiznet/w5100-spi.c
blob: 93a2d3c07303e6eee13f8e3f083b213a4b753609 (plain) (blame)
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
/*
 * Ethernet driver for the WIZnet W5100/W5200/W5500 chip.
 *
 * Copyright (C) 2016 Akinobu Mita <akinobu.mita@gmail.com>
 *
 * Licensed under the GPL-2 or later.
 *
 * Datasheet:
 * http://www.wiznet.co.kr/wp-content/uploads/wiznethome/Chip/W5100/Document/W5100_Datasheet_v1.2.6.pdf
 * http://wiznethome.cafe24.com/wp-content/uploads/wiznethome/Chip/W5200/Documents/W5200_DS_V140E.pdf
 * http://wizwiki.net/wiki/lib/exe/fetch.php?media=products:w5500:w5500_ds_v106e_141230.pdf
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/of_net.h>
#include <linux/spi/spi.h>

#include "w5100.h"

#define W5100_SPI_WRITE_OPCODE 0xf0
#define W5100_SPI_READ_OPCODE 0x0f

static int w5100_spi_read(struct net_device *ndev, u32 addr)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[3] = { W5100_SPI_READ_OPCODE, addr >> 8, addr & 0xff };
	u8 data;
	int ret;

	ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, 1);

	return ret ? ret : data;
}

static int w5100_spi_write(struct net_device *ndev, u32 addr, u8 data)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[4] = { W5100_SPI_WRITE_OPCODE, addr >> 8, addr & 0xff, data};

	return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0);
}

static int w5100_spi_read16(struct net_device *ndev, u32 addr)
{
	u16 data;
	int ret;

	ret = w5100_spi_read(ndev, addr);
	if (ret < 0)
		return ret;
	data = ret << 8;
	ret = w5100_spi_read(ndev, addr + 1);

	return ret < 0 ? ret : data | ret;
}

static int w5100_spi_write16(struct net_device *ndev, u32 addr, u16 data)
{
	int ret;

	ret = w5100_spi_write(ndev, addr, data >> 8);
	if (ret)
		return ret;

	return w5100_spi_write(ndev, addr + 1, data & 0xff);
}

static int w5100_spi_readbulk(struct net_device *ndev, u32 addr, u8 *buf,
			      int len)
{
	int i;

	for (i = 0; i < len; i++) {
		int ret = w5100_spi_read(ndev, addr + i);

		if (ret < 0)
			return ret;
		buf[i] = ret;
	}

	return 0;
}

static int w5100_spi_writebulk(struct net_device *ndev, u32 addr, const u8 *buf,
			       int len)
{
	int i;

	for (i = 0; i < len; i++) {
		int ret = w5100_spi_write(ndev, addr + i, buf[i]);

		if (ret)
			return ret;
	}

	return 0;
}

static const struct w5100_ops w5100_spi_ops = {
	.may_sleep = true,
	.chip_id = W5100,
	.read = w5100_spi_read,
	.write = w5100_spi_write,
	.read16 = w5100_spi_read16,
	.write16 = w5100_spi_write16,
	.readbulk = w5100_spi_readbulk,
	.writebulk = w5100_spi_writebulk,
};

#define W5200_SPI_WRITE_OPCODE 0x80

struct w5200_spi_priv {
	/* Serialize access to cmd_buf */
	struct mutex cmd_lock;

	/* DMA (thus cache coherency maintenance) requires the
	 * transfer buffers to live in their own cache lines.
	 */
	u8 cmd_buf[4] ____cacheline_aligned;
};

static struct w5200_spi_priv *w5200_spi_priv(struct net_device *ndev)
{
	return w5100_ops_priv(ndev);
}

static int w5200_spi_init(struct net_device *ndev)
{
	struct w5200_spi_priv *spi_priv = w5200_spi_priv(ndev);

	mutex_init(&spi_priv->cmd_lock);

	return 0;
}

static int w5200_spi_read(struct net_device *ndev, u32 addr)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[4] = { addr >> 8, addr & 0xff, 0, 1 };
	u8 data;
	int ret;

	ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, 1);

	return ret ? ret : data;
}

static int w5200_spi_write(struct net_device *ndev, u32 addr, u8 data)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[5] = { addr >> 8, addr & 0xff, W5200_SPI_WRITE_OPCODE, 1, data };

	return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0);
}

static int w5200_spi_read16(struct net_device *ndev, u32 addr)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[4] = { addr >> 8, addr & 0xff, 0, 2 };
	__be16 data;
	int ret;

	ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, sizeof(data));

	return ret ? ret : be16_to_cpu(data);
}

static int w5200_spi_write16(struct net_device *ndev, u32 addr, u16 data)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[6] = {
		addr >> 8, addr & 0xff,
		W5200_SPI_WRITE_OPCODE, 2,
		data >> 8, data & 0xff
	};

	return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0);
}

static int w5200_spi_readbulk(struct net_device *ndev, u32 addr, u8 *buf,
			      int len)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	struct w5200_spi_priv *spi_priv = w5200_spi_priv(ndev);
	struct spi_transfer xfer[] = {
		{
			.tx_buf = spi_priv->cmd_buf,
			.len = sizeof(spi_priv->cmd_buf),
		},
		{
			.rx_buf = buf,
			.len = len,
		},
	};
	int ret;

	mutex_lock(&spi_priv->cmd_lock);

	spi_priv->cmd_buf[0] = addr >> 8;
	spi_priv->cmd_buf[1] = addr;
	spi_priv->cmd_buf[2] = len >> 8;
	spi_priv->cmd_buf[3] = len;
	ret = spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer));

	mutex_unlock(&spi_priv->cmd_lock);

	return ret;
}

static int w5200_spi_writebulk(struct net_device *ndev, u32 addr, const u8 *buf,
			       int len)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	struct w5200_spi_priv *spi_priv = w5200_spi_priv(ndev);
	struct spi_transfer xfer[] = {
		{
			.tx_buf = spi_priv->cmd_buf,
			.len = sizeof(spi_priv->cmd_buf),
		},
		{
			.tx_buf = buf,
			.len = len,
		},
	};
	int ret;

	mutex_lock(&spi_priv->cmd_lock);

	spi_priv->cmd_buf[0] = addr >> 8;
	spi_priv->cmd_buf[1] = addr;
	spi_priv->cmd_buf[2] = W5200_SPI_WRITE_OPCODE | (len >> 8);
	spi_priv->cmd_buf[3] = len;
	ret = spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer));

	mutex_unlock(&spi_priv->cmd_lock);

	return ret;
}

static const struct w5100_ops w5200_ops = {
	.may_sleep = true,
	.chip_id = W5200,
	.read = w5200_spi_read,
	.write = w5200_spi_write,
	.read16 = w5200_spi_read16,
	.write16 = w5200_spi_write16,
	.readbulk = w5200_spi_readbulk,
	.writebulk = w5200_spi_writebulk,
	.init = w5200_spi_init,
};

#define W5500_SPI_BLOCK_SELECT(addr) (((addr) >> 16) & 0x1f)
#define W5500_SPI_READ_CONTROL(addr) (W5500_SPI_BLOCK_SELECT(addr) << 3)
#define W5500_SPI_WRITE_CONTROL(addr)	\
	((W5500_SPI_BLOCK_SELECT(addr) << 3) | BIT(2))

struct w5500_spi_priv {
	/* Serialize access to cmd_buf */
	struct mutex cmd_lock;

	/* DMA (thus cache coherency maintenance) requires the
	 * transfer buffers to live in their own cache lines.
	 */
	u8 cmd_buf[3] ____cacheline_aligned;
};

static struct w5500_spi_priv *w5500_spi_priv(struct net_device *ndev)
{
	return w5100_ops_priv(ndev);
}

static int w5500_spi_init(struct net_device *ndev)
{
	struct w5500_spi_priv *spi_priv = w5500_spi_priv(ndev);

	mutex_init(&spi_priv->cmd_lock);

	return 0;
}

static int w5500_spi_read(struct net_device *ndev, u32 addr)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[3] = {
		addr >> 8,
		addr,
		W5500_SPI_READ_CONTROL(addr)
	};
	u8 data;
	int ret;

	ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, 1);

	return ret ? ret : data;
}

static int w5500_spi_write(struct net_device *ndev, u32 addr, u8 data)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[4] = {
		addr >> 8,
		addr,
		W5500_SPI_WRITE_CONTROL(addr),
		data
	};

	return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0);
}

static int w5500_spi_read16(struct net_device *ndev, u32 addr)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[3] = {
		addr >> 8,
		addr,
		W5500_SPI_READ_CONTROL(addr)
	};
	__be16 data;
	int ret;

	ret = spi_write_then_read(spi, cmd, sizeof(cmd), &data, sizeof(data));

	return ret ? ret : be16_to_cpu(data);
}

static int w5500_spi_write16(struct net_device *ndev, u32 addr, u16 data)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	u8 cmd[5] = {
		addr >> 8,
		addr,
		W5500_SPI_WRITE_CONTROL(addr),
		data >> 8,
		data
	};

	return spi_write_then_read(spi, cmd, sizeof(cmd), NULL, 0);
}

static int w5500_spi_readbulk(struct net_device *ndev, u32 addr, u8 *buf,
			      int len)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	struct w5500_spi_priv *spi_priv = w5500_spi_priv(ndev);
	struct spi_transfer xfer[] = {
		{
			.tx_buf = spi_priv->cmd_buf,
			.len = sizeof(spi_priv->cmd_buf),
		},
		{
			.rx_buf = buf,
			.len = len,
		},
	};
	int ret;

	mutex_lock(&spi_priv->cmd_lock);

	spi_priv->cmd_buf[0] = addr >> 8;
	spi_priv->cmd_buf[1] = addr;
	spi_priv->cmd_buf[2] = W5500_SPI_READ_CONTROL(addr);
	ret = spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer));

	mutex_unlock(&spi_priv->cmd_lock);

	return ret;
}

static int w5500_spi_writebulk(struct net_device *ndev, u32 addr, const u8 *buf,
			       int len)
{
	struct spi_device *spi = to_spi_device(ndev->dev.parent);
	struct w5500_spi_priv *spi_priv = w5500_spi_priv(ndev);
	struct spi_transfer xfer[] = {
		{
			.tx_buf = spi_priv->cmd_buf,
			.len = sizeof(spi_priv->cmd_buf),
		},
		{
			.tx_buf = buf,
			.len = len,
		},
	};
	int ret;

	mutex_lock(&spi_priv->cmd_lock);

	spi_priv->cmd_buf[0] = addr >> 8;
	spi_priv->cmd_buf[1] = addr;
	spi_priv->cmd_buf[2] = W5500_SPI_WRITE_CONTROL(addr);
	ret = spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer));

	mutex_unlock(&spi_priv->cmd_lock);

	return ret;
}

static const struct w5100_ops w5500_ops = {
	.may_sleep = true,
	.chip_id = W5500,
	.read = w5500_spi_read,
	.write = w5500_spi_write,
	.read16 = w5500_spi_read16,
	.write16 = w5500_spi_write16,
	.readbulk = w5500_spi_readbulk,
	.writebulk = w5500_spi_writebulk,
	.init = w5500_spi_init,
};

static int w5100_spi_probe(struct spi_device *spi)
{
	const struct spi_device_id *id = spi_get_device_id(spi);
	const struct w5100_ops *ops;
	int priv_size;
	const void *mac = of_get_mac_address(spi->dev.of_node);

	switch (id->driver_data) {
	case W5100:
		ops = &w5100_spi_ops;
		priv_size = 0;
		break;
	case W5200:
		ops = &w5200_ops;
		priv_size = sizeof(struct w5200_spi_priv);
		break;
	case W5500:
		ops = &w5500_ops;
		priv_size = sizeof(struct w5500_spi_priv);
		break;
	default:
		return -EINVAL;
	}

	return w5100_probe(&spi->dev, ops, priv_size, mac, spi->irq, -EINVAL);
}

static int w5100_spi_remove(struct spi_device *spi)
{
	return w5100_remove(&spi->dev);
}

static const struct spi_device_id w5100_spi_ids[] = {
	{ "w5100", W5100 },
	{ "w5200", W5200 },
	{ "w5500", W5500 },
	{}
};
MODULE_DEVICE_TABLE(spi, w5100_spi_ids);

static struct spi_driver w5100_spi_driver = {
	.driver		= {
		.name	= "w5100",
		.pm	= &w5100_pm_ops,
	},
	.probe		= w5100_spi_probe,
	.remove		= w5100_spi_remove,
	.id_table	= w5100_spi_ids,
};
module_spi_driver(w5100_spi_driver);

MODULE_DESCRIPTION("WIZnet W5100/W5200/W5500 Ethernet driver for SPI mode");
MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
MODULE_LICENSE("GPL");