summaryrefslogtreecommitdiff
path: root/drivers/nfc/nxp-nci/firmware.c
blob: 5291797324bae0752098a15b6b3f7221c612b8ce (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
/*
 * Generic driver for NXP NCI NFC chips
 *
 * Copyright (C) 2014  NXP Semiconductors  All rights reserved.
 *
 * Author: Clément Perrochaud <clement.perrochaud@nxp.com>
 *
 * Derived from PN544 device driver:
 * Copyright (C) 2012  Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */

#include <linux/completion.h>
#include <linux/firmware.h>
#include <linux/nfc.h>
#include <linux/unaligned/access_ok.h>

#include "nxp-nci.h"

/* Crypto operations can take up to 30 seconds */
#define NXP_NCI_FW_ANSWER_TIMEOUT	msecs_to_jiffies(30000)

#define NXP_NCI_FW_CMD_RESET		0xF0
#define NXP_NCI_FW_CMD_GETVERSION	0xF1
#define NXP_NCI_FW_CMD_CHECKINTEGRITY	0xE0
#define NXP_NCI_FW_CMD_WRITE		0xC0
#define NXP_NCI_FW_CMD_READ		0xA2
#define NXP_NCI_FW_CMD_GETSESSIONSTATE	0xF2
#define NXP_NCI_FW_CMD_LOG		0xA7
#define NXP_NCI_FW_CMD_FORCE		0xD0
#define NXP_NCI_FW_CMD_GET_DIE_ID	0xF4

#define NXP_NCI_FW_CHUNK_FLAG	0x0400

#define NXP_NCI_FW_RESULT_OK				0x00
#define NXP_NCI_FW_RESULT_INVALID_ADDR			0x01
#define NXP_NCI_FW_RESULT_GENERIC_ERROR			0x02
#define NXP_NCI_FW_RESULT_UNKNOWN_CMD			0x0B
#define NXP_NCI_FW_RESULT_ABORTED_CMD			0x0C
#define NXP_NCI_FW_RESULT_PLL_ERROR			0x0D
#define NXP_NCI_FW_RESULT_ADDR_RANGE_OFL_ERROR		0x1E
#define NXP_NCI_FW_RESULT_BUFFER_OFL_ERROR		0x1F
#define NXP_NCI_FW_RESULT_MEM_BSY			0x20
#define NXP_NCI_FW_RESULT_SIGNATURE_ERROR		0x21
#define NXP_NCI_FW_RESULT_FIRMWARE_VERSION_ERROR	0x24
#define NXP_NCI_FW_RESULT_PROTOCOL_ERROR		0x28
#define NXP_NCI_FW_RESULT_SFWU_DEGRADED			0x2A
#define NXP_NCI_FW_RESULT_PH_STATUS_FIRST_CHUNK		0x2D
#define NXP_NCI_FW_RESULT_PH_STATUS_NEXT_CHUNK		0x2E
#define NXP_NCI_FW_RESULT_PH_STATUS_INTERNAL_ERROR_5	0xC5

void nxp_nci_fw_work_complete(struct nxp_nci_info *info, int result)
{
	struct nxp_nci_fw_info *fw_info = &info->fw_info;
	int r;

	if (info->phy_ops->set_mode) {
		r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_COLD);
		if (r < 0 && result == 0)
			result = -r;
	}

	info->mode = NXP_NCI_MODE_COLD;

	if (fw_info->fw) {
		release_firmware(fw_info->fw);
		fw_info->fw = NULL;
	}

	nfc_fw_download_done(info->ndev->nfc_dev, fw_info->name, (u32) -result);
}

/* crc_ccitt cannot be used since it is computed MSB first and not LSB first */
static u16 nxp_nci_fw_crc(u8 const *buffer, size_t len)
{
	u16 crc = 0xffff;

	while (len--) {
		crc = ((crc >> 8) | (crc << 8)) ^ *buffer++;
		crc ^= (crc & 0xff) >> 4;
		crc ^= (crc & 0xff) << 12;
		crc ^= (crc & 0xff) << 5;
	}

	return crc;
}

static int nxp_nci_fw_send_chunk(struct nxp_nci_info *info)
{
	struct nxp_nci_fw_info *fw_info = &info->fw_info;
	u16 header, crc;
	struct sk_buff *skb;
	size_t chunk_len;
	size_t remaining_len;
	int r;

	skb = nci_skb_alloc(info->ndev, info->max_payload, GFP_KERNEL);
	if (!skb) {
		r = -ENOMEM;
		goto chunk_exit;
	}

	chunk_len = info->max_payload - NXP_NCI_FW_HDR_LEN - NXP_NCI_FW_CRC_LEN;
	remaining_len = fw_info->frame_size - fw_info->written;

	if (remaining_len > chunk_len) {
		header = NXP_NCI_FW_CHUNK_FLAG;
	} else {
		chunk_len = remaining_len;
		header = 0x0000;
	}

	header |= chunk_len & NXP_NCI_FW_FRAME_LEN_MASK;
	put_unaligned_be16(header, skb_put(skb, NXP_NCI_FW_HDR_LEN));

	memcpy(skb_put(skb, chunk_len), fw_info->data + fw_info->written,
	       chunk_len);

	crc = nxp_nci_fw_crc(skb->data, chunk_len + NXP_NCI_FW_HDR_LEN);
	put_unaligned_be16(crc, skb_put(skb, NXP_NCI_FW_CRC_LEN));

	r = info->phy_ops->write(info->phy_id, skb);
	if (r >= 0)
		r = chunk_len;

	kfree_skb(skb);

chunk_exit:
	return r;
}

static int nxp_nci_fw_send(struct nxp_nci_info *info)
{
	struct nxp_nci_fw_info *fw_info = &info->fw_info;
	long completion_rc;
	int r;

	reinit_completion(&fw_info->cmd_completion);

	if (fw_info->written == 0) {
		fw_info->frame_size = get_unaligned_be16(fw_info->data) &
				      NXP_NCI_FW_FRAME_LEN_MASK;
		fw_info->data += NXP_NCI_FW_HDR_LEN;
		fw_info->size -= NXP_NCI_FW_HDR_LEN;
	}

	if (fw_info->frame_size > fw_info->size)
		return -EMSGSIZE;

	r = nxp_nci_fw_send_chunk(info);
	if (r < 0)
		return r;

	fw_info->written += r;

	if (*fw_info->data == NXP_NCI_FW_CMD_RESET) {
		fw_info->cmd_result = 0;
		if (fw_info->fw)
			schedule_work(&fw_info->work);
	} else {
		completion_rc = wait_for_completion_interruptible_timeout(
			&fw_info->cmd_completion, NXP_NCI_FW_ANSWER_TIMEOUT);
		if (completion_rc == 0)
			return -ETIMEDOUT;
	}

	return 0;
}

void nxp_nci_fw_work(struct work_struct *work)
{
	struct nxp_nci_info *info;
	struct nxp_nci_fw_info *fw_info;
	int r;

	fw_info = container_of(work, struct nxp_nci_fw_info, work);
	info = container_of(fw_info, struct nxp_nci_info, fw_info);

	mutex_lock(&info->info_lock);

	r = fw_info->cmd_result;
	if (r < 0)
		goto exit_work;

	if (fw_info->written == fw_info->frame_size) {
		fw_info->data += fw_info->frame_size;
		fw_info->size -= fw_info->frame_size;
		fw_info->written = 0;
	}

	if (fw_info->size > 0)
		r = nxp_nci_fw_send(info);

exit_work:
	if (r < 0 || fw_info->size == 0)
		nxp_nci_fw_work_complete(info, r);
	mutex_unlock(&info->info_lock);
}

int nxp_nci_fw_download(struct nci_dev *ndev, const char *firmware_name)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	struct nxp_nci_fw_info *fw_info = &info->fw_info;
	int r;

	mutex_lock(&info->info_lock);

	if (!info->phy_ops->set_mode || !info->phy_ops->write) {
		r = -ENOTSUPP;
		goto fw_download_exit;
	}

	if (!firmware_name || firmware_name[0] == '\0') {
		r = -EINVAL;
		goto fw_download_exit;
	}

	strcpy(fw_info->name, firmware_name);

	r = request_firmware(&fw_info->fw, firmware_name,
			     ndev->nfc_dev->dev.parent);
	if (r < 0)
		goto fw_download_exit;

	r = info->phy_ops->set_mode(info->phy_id, NXP_NCI_MODE_FW);
	if (r < 0) {
		release_firmware(fw_info->fw);
		goto fw_download_exit;
	}

	info->mode = NXP_NCI_MODE_FW;

	fw_info->data = fw_info->fw->data;
	fw_info->size = fw_info->fw->size;
	fw_info->written = 0;
	fw_info->frame_size = 0;
	fw_info->cmd_result = 0;

	schedule_work(&fw_info->work);

fw_download_exit:
	mutex_unlock(&info->info_lock);
	return r;
}

static int nxp_nci_fw_read_status(u8 stat)
{
	switch (stat) {
	case NXP_NCI_FW_RESULT_OK:
		return 0;
	case NXP_NCI_FW_RESULT_INVALID_ADDR:
		return -EINVAL;
	case NXP_NCI_FW_RESULT_UNKNOWN_CMD:
		return -EINVAL;
	case NXP_NCI_FW_RESULT_ABORTED_CMD:
		return -EMSGSIZE;
	case NXP_NCI_FW_RESULT_ADDR_RANGE_OFL_ERROR:
		return -EADDRNOTAVAIL;
	case NXP_NCI_FW_RESULT_BUFFER_OFL_ERROR:
		return -ENOBUFS;
	case NXP_NCI_FW_RESULT_MEM_BSY:
		return -ENOKEY;
	case NXP_NCI_FW_RESULT_SIGNATURE_ERROR:
		return -EKEYREJECTED;
	case NXP_NCI_FW_RESULT_FIRMWARE_VERSION_ERROR:
		return -EALREADY;
	case NXP_NCI_FW_RESULT_PROTOCOL_ERROR:
		return -EPROTO;
	case NXP_NCI_FW_RESULT_SFWU_DEGRADED:
		return -EHWPOISON;
	case NXP_NCI_FW_RESULT_PH_STATUS_FIRST_CHUNK:
		return 0;
	case NXP_NCI_FW_RESULT_PH_STATUS_NEXT_CHUNK:
		return 0;
	case NXP_NCI_FW_RESULT_PH_STATUS_INTERNAL_ERROR_5:
		return -EINVAL;
	default:
		return -EIO;
	}
}

static u16 nxp_nci_fw_check_crc(struct sk_buff *skb)
{
	u16 crc, frame_crc;
	size_t len = skb->len - NXP_NCI_FW_CRC_LEN;

	crc = nxp_nci_fw_crc(skb->data, len);
	frame_crc = get_unaligned_be16(skb->data + len);

	return (crc ^ frame_crc);
}

void nxp_nci_fw_recv_frame(struct nci_dev *ndev, struct sk_buff *skb)
{
	struct nxp_nci_info *info = nci_get_drvdata(ndev);
	struct nxp_nci_fw_info *fw_info = &info->fw_info;

	complete(&fw_info->cmd_completion);

	if (skb) {
		if (nxp_nci_fw_check_crc(skb) != 0x00)
			fw_info->cmd_result = -EBADMSG;
		else
			fw_info->cmd_result = nxp_nci_fw_read_status(
					*skb_pull(skb, NXP_NCI_FW_HDR_LEN));
		kfree_skb(skb);
	} else {
		fw_info->cmd_result = -EIO;
	}

	if (fw_info->fw)
		schedule_work(&fw_info->work);
}
EXPORT_SYMBOL(nxp_nci_fw_recv_frame);