summaryrefslogtreecommitdiff
path: root/drivers/crypto/atmel-i2c.c
blob: 55bff1e13142606e650635f1b5345e75f16b061f (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Microchip / Atmel ECC (I2C) driver.
 *
 * Copyright (c) 2017, Microchip Technology Inc.
 * Author: Tudor Ambarus
 */

#include <linux/bitrev.h>
#include <linux/crc16.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
#include "atmel-i2c.h"

static const struct {
	u8 value;
	const char *error_text;
} error_list[] = {
	{ 0x01, "CheckMac or Verify miscompare" },
	{ 0x03, "Parse Error" },
	{ 0x05, "ECC Fault" },
	{ 0x0F, "Execution Error" },
	{ 0xEE, "Watchdog about to expire" },
	{ 0xFF, "CRC or other communication error" },
};

/**
 * atmel_i2c_checksum() - Generate 16-bit CRC as required by ATMEL ECC.
 * CRC16 verification of the count, opcode, param1, param2 and data bytes.
 * The checksum is saved in little-endian format in the least significant
 * two bytes of the command. CRC polynomial is 0x8005 and the initial register
 * value should be zero.
 *
 * @cmd : structure used for communicating with the device.
 */
static void atmel_i2c_checksum(struct atmel_i2c_cmd *cmd)
{
	u8 *data = &cmd->count;
	size_t len = cmd->count - CRC_SIZE;
	__le16 *__crc16 = (__le16 *)(data + len);

	*__crc16 = cpu_to_le16(bitrev16(crc16(0, data, len)));
}

void atmel_i2c_init_read_cmd(struct atmel_i2c_cmd *cmd)
{
	cmd->word_addr = COMMAND;
	cmd->opcode = OPCODE_READ;
	/*
	 * Read the word from Configuration zone that contains the lock bytes
	 * (UserExtra, Selector, LockValue, LockConfig).
	 */
	cmd->param1 = CONFIG_ZONE;
	cmd->param2 = cpu_to_le16(DEVICE_LOCK_ADDR);
	cmd->count = READ_COUNT;

	atmel_i2c_checksum(cmd);

	cmd->msecs = MAX_EXEC_TIME_READ;
	cmd->rxsize = READ_RSP_SIZE;
}
EXPORT_SYMBOL(atmel_i2c_init_read_cmd);

void atmel_i2c_init_random_cmd(struct atmel_i2c_cmd *cmd)
{
	cmd->word_addr = COMMAND;
	cmd->opcode = OPCODE_RANDOM;
	cmd->param1 = 0;
	cmd->param2 = 0;
	cmd->count = RANDOM_COUNT;

	atmel_i2c_checksum(cmd);

	cmd->msecs = MAX_EXEC_TIME_RANDOM;
	cmd->rxsize = RANDOM_RSP_SIZE;
}
EXPORT_SYMBOL(atmel_i2c_init_random_cmd);

void atmel_i2c_init_genkey_cmd(struct atmel_i2c_cmd *cmd, u16 keyid)
{
	cmd->word_addr = COMMAND;
	cmd->count = GENKEY_COUNT;
	cmd->opcode = OPCODE_GENKEY;
	cmd->param1 = GENKEY_MODE_PRIVATE;
	/* a random private key will be generated and stored in slot keyID */
	cmd->param2 = cpu_to_le16(keyid);

	atmel_i2c_checksum(cmd);

	cmd->msecs = MAX_EXEC_TIME_GENKEY;
	cmd->rxsize = GENKEY_RSP_SIZE;
}
EXPORT_SYMBOL(atmel_i2c_init_genkey_cmd);

int atmel_i2c_init_ecdh_cmd(struct atmel_i2c_cmd *cmd,
			    struct scatterlist *pubkey)
{
	size_t copied;

	cmd->word_addr = COMMAND;
	cmd->count = ECDH_COUNT;
	cmd->opcode = OPCODE_ECDH;
	cmd->param1 = ECDH_PREFIX_MODE;
	/* private key slot */
	cmd->param2 = cpu_to_le16(DATA_SLOT_2);

	/*
	 * The device only supports NIST P256 ECC keys. The public key size will
	 * always be the same. Use a macro for the key size to avoid unnecessary
	 * computations.
	 */
	copied = sg_copy_to_buffer(pubkey,
				   sg_nents_for_len(pubkey,
						    ATMEL_ECC_PUBKEY_SIZE),
				   cmd->data, ATMEL_ECC_PUBKEY_SIZE);
	if (copied != ATMEL_ECC_PUBKEY_SIZE)
		return -EINVAL;

	atmel_i2c_checksum(cmd);

	cmd->msecs = MAX_EXEC_TIME_ECDH;
	cmd->rxsize = ECDH_RSP_SIZE;

	return 0;
}
EXPORT_SYMBOL(atmel_i2c_init_ecdh_cmd);

/*
 * After wake and after execution of a command, there will be error, status, or
 * result bytes in the device's output register that can be retrieved by the
 * system. When the length of that group is four bytes, the codes returned are
 * detailed in error_list.
 */
static int atmel_i2c_status(struct device *dev, u8 *status)
{
	size_t err_list_len = ARRAY_SIZE(error_list);
	int i;
	u8 err_id = status[1];

	if (*status != STATUS_SIZE)
		return 0;

	if (err_id == STATUS_WAKE_SUCCESSFUL || err_id == STATUS_NOERR)
		return 0;

	for (i = 0; i < err_list_len; i++)
		if (error_list[i].value == err_id)
			break;

	/* if err_id is not in the error_list then ignore it */
	if (i != err_list_len) {
		dev_err(dev, "%02x: %s:\n", err_id, error_list[i].error_text);
		return err_id;
	}

	return 0;
}

static int atmel_i2c_wakeup(struct i2c_client *client)
{
	struct atmel_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
	u8 status[STATUS_RSP_SIZE];
	int ret;

	/*
	 * The device ignores any levels or transitions on the SCL pin when the
	 * device is idle, asleep or during waking up. Don't check for error
	 * when waking up the device.
	 */
	i2c_transfer_buffer_flags(client, i2c_priv->wake_token,
				i2c_priv->wake_token_sz, I2C_M_IGNORE_NAK);

	/*
	 * Wait to wake the device. Typical execution times for ecdh and genkey
	 * are around tens of milliseconds. Delta is chosen to 50 microseconds.
	 */
	usleep_range(TWHI_MIN, TWHI_MAX);

	ret = i2c_master_recv(client, status, STATUS_SIZE);
	if (ret < 0)
		return ret;

	return atmel_i2c_status(&client->dev, status);
}

static int atmel_i2c_sleep(struct i2c_client *client)
{
	u8 sleep = SLEEP_TOKEN;

	return i2c_master_send(client, &sleep, 1);
}

/*
 * atmel_i2c_send_receive() - send a command to the device and receive its
 *                            response.
 * @client: i2c client device
 * @cmd   : structure used to communicate with the device
 *
 * After the device receives a Wake token, a watchdog counter starts within the
 * device. After the watchdog timer expires, the device enters sleep mode
 * regardless of whether some I/O transmission or command execution is in
 * progress. If a command is attempted when insufficient time remains prior to
 * watchdog timer execution, the device will return the watchdog timeout error
 * code without attempting to execute the command. There is no way to reset the
 * counter other than to put the device into sleep or idle mode and then
 * wake it up again.
 */
int atmel_i2c_send_receive(struct i2c_client *client, struct atmel_i2c_cmd *cmd)
{
	struct atmel_i2c_client_priv *i2c_priv = i2c_get_clientdata(client);
	int ret;

	mutex_lock(&i2c_priv->lock);

	ret = atmel_i2c_wakeup(client);
	if (ret)
		goto err;

	/* send the command */
	ret = i2c_master_send(client, (u8 *)cmd, cmd->count + WORD_ADDR_SIZE);
	if (ret < 0)
		goto err;

	/* delay the appropriate amount of time for command to execute */
	msleep(cmd->msecs);

	/* receive the response */
	ret = i2c_master_recv(client, cmd->data, cmd->rxsize);
	if (ret < 0)
		goto err;

	/* put the device into low-power mode */
	ret = atmel_i2c_sleep(client);
	if (ret < 0)
		goto err;

	mutex_unlock(&i2c_priv->lock);
	return atmel_i2c_status(&client->dev, cmd->data);
err:
	mutex_unlock(&i2c_priv->lock);
	return ret;
}
EXPORT_SYMBOL(atmel_i2c_send_receive);

static void atmel_i2c_work_handler(struct work_struct *work)
{
	struct atmel_i2c_work_data *work_data =
			container_of(work, struct atmel_i2c_work_data, work);
	struct atmel_i2c_cmd *cmd = &work_data->cmd;
	struct i2c_client *client = work_data->client;
	int status;

	status = atmel_i2c_send_receive(client, cmd);
	work_data->cbk(work_data, work_data->areq, status);
}

static struct workqueue_struct *atmel_wq;

void atmel_i2c_enqueue(struct atmel_i2c_work_data *work_data,
		       void (*cbk)(struct atmel_i2c_work_data *work_data,
				   void *areq, int status),
		       void *areq)
{
	work_data->cbk = (void *)cbk;
	work_data->areq = areq;

	INIT_WORK(&work_data->work, atmel_i2c_work_handler);
	queue_work(atmel_wq, &work_data->work);
}
EXPORT_SYMBOL(atmel_i2c_enqueue);

void atmel_i2c_flush_queue(void)
{
	flush_workqueue(atmel_wq);
}
EXPORT_SYMBOL(atmel_i2c_flush_queue);

static inline size_t atmel_i2c_wake_token_sz(u32 bus_clk_rate)
{
	u32 no_of_bits = DIV_ROUND_UP(TWLO_USEC * bus_clk_rate, USEC_PER_SEC);

	/* return the size of the wake_token in bytes */
	return DIV_ROUND_UP(no_of_bits, 8);
}

static int device_sanity_check(struct i2c_client *client)
{
	struct atmel_i2c_cmd *cmd;
	int ret;

	cmd = kmalloc(sizeof(*cmd), GFP_KERNEL);
	if (!cmd)
		return -ENOMEM;

	atmel_i2c_init_read_cmd(cmd);

	ret = atmel_i2c_send_receive(client, cmd);
	if (ret)
		goto free_cmd;

	/*
	 * It is vital that the Configuration, Data and OTP zones be locked
	 * prior to release into the field of the system containing the device.
	 * Failure to lock these zones may permit modification of any secret
	 * keys and may lead to other security problems.
	 */
	if (cmd->data[LOCK_CONFIG_IDX] || cmd->data[LOCK_VALUE_IDX]) {
		dev_err(&client->dev, "Configuration or Data and OTP zones are unlocked!\n");
		ret = -ENOTSUPP;
	}

	/* fall through */
free_cmd:
	kfree(cmd);
	return ret;
}

int atmel_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id)
{
	struct atmel_i2c_client_priv *i2c_priv;
	struct device *dev = &client->dev;
	int ret;
	u32 bus_clk_rate;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(dev, "I2C_FUNC_I2C not supported\n");
		return -ENODEV;
	}

	bus_clk_rate = i2c_acpi_find_bus_speed(&client->adapter->dev);
	if (!bus_clk_rate) {
		ret = device_property_read_u32(&client->adapter->dev,
					       "clock-frequency", &bus_clk_rate);
		if (ret) {
			dev_err(dev, "failed to read clock-frequency property\n");
			return ret;
		}
	}

	if (bus_clk_rate > 1000000L) {
		dev_err(dev, "%u exceeds maximum supported clock frequency (1MHz)\n",
			bus_clk_rate);
		return -EINVAL;
	}

	i2c_priv = devm_kmalloc(dev, sizeof(*i2c_priv), GFP_KERNEL);
	if (!i2c_priv)
		return -ENOMEM;

	i2c_priv->client = client;
	mutex_init(&i2c_priv->lock);

	/*
	 * WAKE_TOKEN_MAX_SIZE was calculated for the maximum bus_clk_rate -
	 * 1MHz. The previous bus_clk_rate check ensures us that wake_token_sz
	 * will always be smaller than or equal to WAKE_TOKEN_MAX_SIZE.
	 */
	i2c_priv->wake_token_sz = atmel_i2c_wake_token_sz(bus_clk_rate);

	memset(i2c_priv->wake_token, 0, sizeof(i2c_priv->wake_token));

	atomic_set(&i2c_priv->tfm_count, 0);

	i2c_set_clientdata(client, i2c_priv);

	return device_sanity_check(client);
}
EXPORT_SYMBOL(atmel_i2c_probe);

static int __init atmel_i2c_init(void)
{
	atmel_wq = alloc_workqueue("atmel_wq", 0, 0);
	return atmel_wq ? 0 : -ENOMEM;
}

static void __exit atmel_i2c_exit(void)
{
	destroy_workqueue(atmel_wq);
}

module_init(atmel_i2c_init);
module_exit(atmel_i2c_exit);

MODULE_AUTHOR("Tudor Ambarus");
MODULE_DESCRIPTION("Microchip / Atmel ECC (I2C) driver");
MODULE_LICENSE("GPL v2");