summaryrefslogtreecommitdiffstats
path: root/drivers/soc/qcom/wcnss_ctrl.c
blob: 7a986f881d5c860df19614c4ca781bce69d2d296 (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
/*
 * Copyright (c) 2015, Sony Mobile Communications Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only 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.
 */
#include <linux/firmware.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/soc/qcom/smd.h>

#define WCNSS_REQUEST_TIMEOUT	(5 * HZ)

#define NV_FRAGMENT_SIZE	3072
#define NVBIN_FILE		"wlan/prima/WCNSS_qcom_wlan_nv.bin"

/**
 * struct wcnss_ctrl - driver context
 * @dev:	device handle
 * @channel:	SMD channel handle
 * @ack:	completion for outstanding requests
 * @ack_status:	status of the outstanding request
 * @download_nv_work: worker for uploading nv binary
 */
struct wcnss_ctrl {
	struct device *dev;
	struct qcom_smd_channel *channel;

	struct completion ack;
	int ack_status;

	struct work_struct download_nv_work;
};

/* message types */
enum {
	WCNSS_VERSION_REQ = 0x01000000,
	WCNSS_VERSION_RESP,
	WCNSS_DOWNLOAD_NV_REQ,
	WCNSS_DOWNLOAD_NV_RESP,
	WCNSS_UPLOAD_CAL_REQ,
	WCNSS_UPLOAD_CAL_RESP,
	WCNSS_DOWNLOAD_CAL_REQ,
	WCNSS_DOWNLOAD_CAL_RESP,
};

/**
 * struct wcnss_msg_hdr - common packet header for requests and responses
 * @type:	packet message type
 * @len:	total length of the packet, including this header
 */
struct wcnss_msg_hdr {
	u32 type;
	u32 len;
} __packed;

/**
 * struct wcnss_version_resp - version request response
 * @hdr:	common packet wcnss_msg_hdr header
 */
struct wcnss_version_resp {
	struct wcnss_msg_hdr hdr;
	u8 major;
	u8 minor;
	u8 version;
	u8 revision;
} __packed;

/**
 * struct wcnss_download_nv_req - firmware fragment request
 * @hdr:	common packet wcnss_msg_hdr header
 * @seq:	sequence number of this fragment
 * @last:	boolean indicator of this being the last fragment of the binary
 * @frag_size:	length of this fragment
 * @fragment:	fragment data
 */
struct wcnss_download_nv_req {
	struct wcnss_msg_hdr hdr;
	u16 seq;
	u16 last;
	u32 frag_size;
	u8 fragment[];
} __packed;

/**
 * struct wcnss_download_nv_resp - firmware download response
 * @hdr:	common packet wcnss_msg_hdr header
 * @status:	boolean to indicate success of the download
 */
struct wcnss_download_nv_resp {
	struct wcnss_msg_hdr hdr;
	u8 status;
} __packed;

/**
 * wcnss_ctrl_smd_callback() - handler from SMD responses
 * @qsdev:	smd device handle
 * @data:	pointer to the incoming data packet
 * @count:	size of the incoming data packet
 *
 * Handles any incoming packets from the remote WCNSS_CTRL service.
 */
static int wcnss_ctrl_smd_callback(struct qcom_smd_device *qsdev,
				   const void *data,
				   size_t count)
{
	struct wcnss_ctrl *wcnss = dev_get_drvdata(&qsdev->dev);
	const struct wcnss_download_nv_resp *nvresp;
	const struct wcnss_version_resp *version;
	const struct wcnss_msg_hdr *hdr = data;

	switch (hdr->type) {
	case WCNSS_VERSION_RESP:
		if (count != sizeof(*version)) {
			dev_err(wcnss->dev,
				"invalid size of version response\n");
			break;
		}

		version = data;
		dev_info(wcnss->dev, "WCNSS Version %d.%d %d.%d\n",
			 version->major, version->minor,
			 version->version, version->revision);

		schedule_work(&wcnss->download_nv_work);
		break;
	case WCNSS_DOWNLOAD_NV_RESP:
		if (count != sizeof(*nvresp)) {
			dev_err(wcnss->dev,
				"invalid size of download response\n");
			break;
		}

		nvresp = data;
		wcnss->ack_status = nvresp->status;
		complete(&wcnss->ack);
		break;
	default:
		dev_info(wcnss->dev, "unknown message type %d\n", hdr->type);
		break;
	}

	return 0;
}

/**
 * wcnss_request_version() - send a version request to WCNSS
 * @wcnss:	wcnss ctrl driver context
 */
static int wcnss_request_version(struct wcnss_ctrl *wcnss)
{
	struct wcnss_msg_hdr msg;

	msg.type = WCNSS_VERSION_REQ;
	msg.len = sizeof(msg);

	return qcom_smd_send(wcnss->channel, &msg, sizeof(msg));
}

/**
 * wcnss_download_nv() - send nv binary to WCNSS
 * @work:	work struct to acquire wcnss context
 */
static void wcnss_download_nv(struct work_struct *work)
{
	struct wcnss_ctrl *wcnss = container_of(work, struct wcnss_ctrl, download_nv_work);
	struct wcnss_download_nv_req *req;
	const struct firmware *fw;
	const void *data;
	ssize_t left;
	int ret;

	req = kzalloc(sizeof(*req) + NV_FRAGMENT_SIZE, GFP_KERNEL);
	if (!req)
		return;

	ret = request_firmware(&fw, NVBIN_FILE, wcnss->dev);
	if (ret) {
		dev_err(wcnss->dev, "Failed to load nv file %s: %d\n",
			NVBIN_FILE, ret);
		goto free_req;
	}

	data = fw->data;
	left = fw->size;

	req->hdr.type = WCNSS_DOWNLOAD_NV_REQ;
	req->hdr.len = sizeof(*req) + NV_FRAGMENT_SIZE;

	req->last = 0;
	req->frag_size = NV_FRAGMENT_SIZE;

	req->seq = 0;
	do {
		if (left <= NV_FRAGMENT_SIZE) {
			req->last = 1;
			req->frag_size = left;
			req->hdr.len = sizeof(*req) + left;
		}

		memcpy(req->fragment, data, req->frag_size);

		ret = qcom_smd_send(wcnss->channel, req, req->hdr.len);
		if (ret) {
			dev_err(wcnss->dev, "failed to send smd packet\n");
			goto release_fw;
		}

		/* Increment for next fragment */
		req->seq++;

		data += req->hdr.len;
		left -= NV_FRAGMENT_SIZE;
	} while (left > 0);

	ret = wait_for_completion_timeout(&wcnss->ack, WCNSS_REQUEST_TIMEOUT);
	if (!ret)
		dev_err(wcnss->dev, "timeout waiting for nv upload ack\n");
	else if (wcnss->ack_status != 1)
		dev_err(wcnss->dev, "nv upload response failed err: %d\n",
			wcnss->ack_status);

release_fw:
	release_firmware(fw);
free_req:
	kfree(req);
}

static int wcnss_ctrl_probe(struct qcom_smd_device *sdev)
{
	struct wcnss_ctrl *wcnss;

	wcnss = devm_kzalloc(&sdev->dev, sizeof(*wcnss), GFP_KERNEL);
	if (!wcnss)
		return -ENOMEM;

	wcnss->dev = &sdev->dev;
	wcnss->channel = sdev->channel;

	init_completion(&wcnss->ack);
	INIT_WORK(&wcnss->download_nv_work, wcnss_download_nv);

	dev_set_drvdata(&sdev->dev, wcnss);

	return wcnss_request_version(wcnss);
}

static const struct qcom_smd_id wcnss_ctrl_smd_match[] = {
	{ .name = "WCNSS_CTRL" },
	{}
};

static struct qcom_smd_driver wcnss_ctrl_driver = {
	.probe = wcnss_ctrl_probe,
	.callback = wcnss_ctrl_smd_callback,
	.smd_match_table = wcnss_ctrl_smd_match,
	.driver  = {
		.name  = "qcom_wcnss_ctrl",
		.owner = THIS_MODULE,
	},
};

module_qcom_smd_driver(wcnss_ctrl_driver);

MODULE_DESCRIPTION("Qualcomm WCNSS control driver");
MODULE_LICENSE("GPL v2");