aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/wireless/iwlwifi/mvm/nvm.c
blob: b8ec02f89acc86848a8514f0679c3369abf9ef91 (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
/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <ilw@linux.intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2012 - 2013 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#include "iwl-trans.h"
#include "mvm.h"
#include "iwl-eeprom-parse.h"
#include "iwl-eeprom-read.h"
#include "iwl-nvm-parse.h"

/* list of NVM sections we are allowed/need to read */
static const int nvm_to_read[] = {
	NVM_SECTION_TYPE_HW,
	NVM_SECTION_TYPE_SW,
	NVM_SECTION_TYPE_CALIBRATION,
	NVM_SECTION_TYPE_PRODUCTION,
};

/* Default NVM size to read */
#define IWL_NVM_DEFAULT_CHUNK_SIZE (2*1024);

static inline void iwl_nvm_fill_read(struct iwl_nvm_access_cmd *cmd,
				     u16 offset, u16 length, u16 section)
{
	cmd->offset = cpu_to_le16(offset);
	cmd->length = cpu_to_le16(length);
	cmd->type = cpu_to_le16(section);
}

static int iwl_nvm_read_chunk(struct iwl_mvm *mvm, u16 section,
			      u16 offset, u16 length, u8 *data)
{
	struct iwl_nvm_access_cmd nvm_access_cmd = {};
	struct iwl_nvm_access_resp *nvm_resp;
	struct iwl_rx_packet *pkt;
	struct iwl_host_cmd cmd = {
		.id = NVM_ACCESS_CMD,
		.flags = CMD_SYNC | CMD_WANT_SKB,
		.data = { &nvm_access_cmd, },
	};
	int ret, bytes_read, offset_read;
	u8 *resp_data;

	iwl_nvm_fill_read(&nvm_access_cmd, offset, length, section);
	cmd.len[0] = sizeof(struct iwl_nvm_access_cmd);

	ret = iwl_mvm_send_cmd(mvm, &cmd);
	if (ret)
		return ret;

	pkt = cmd.resp_pkt;
	if (pkt->hdr.flags & IWL_CMD_FAILED_MSK) {
		IWL_ERR(mvm, "Bad return from NVM_ACCES_COMMAND (0x%08X)\n",
			pkt->hdr.flags);
		ret = -EIO;
		goto exit;
	}

	/* Extract NVM response */
	nvm_resp = (void *)pkt->data;
	ret = le16_to_cpu(nvm_resp->status);
	bytes_read = le16_to_cpu(nvm_resp->length);
	offset_read = le16_to_cpu(nvm_resp->offset);
	resp_data = nvm_resp->data;
	if (ret) {
		IWL_ERR(mvm,
			"NVM access command failed with status %d (device: %s)\n",
			ret, mvm->cfg->name);
		ret = -EINVAL;
		goto exit;
	}

	if (offset_read != offset) {
		IWL_ERR(mvm, "NVM ACCESS response with invalid offset %d\n",
			offset_read);
		ret = -EINVAL;
		goto exit;
	}

	/* Write data to NVM */
	memcpy(data + offset, resp_data, bytes_read);
	ret = bytes_read;

exit:
	iwl_free_resp(&cmd);
	return ret;
}

/*
 * Reads an NVM section completely.
 * NICs prior to 7000 family doesn't have a real NVM, but just read
 * section 0 which is the EEPROM. Because the EEPROM reading is unlimited
 * by uCode, we need to manually check in this case that we don't
 * overflow and try to read more than the EEPROM size.
 * For 7000 family NICs, we supply the maximal size we can read, and
 * the uCode fills the response with as much data as we can,
 * without overflowing, so no check is needed.
 */
static int iwl_nvm_read_section(struct iwl_mvm *mvm, u16 section,
				u8 *data)
{
	u16 length, offset = 0;
	int ret;

	/* Set nvm section read length */
	length = IWL_NVM_DEFAULT_CHUNK_SIZE;

	ret = length;

	/* Read the NVM until exhausted (reading less than requested) */
	while (ret == length) {
		ret = iwl_nvm_read_chunk(mvm, section, offset, length, data);
		if (ret < 0) {
			IWL_ERR(mvm,
				"Cannot read NVM from section %d offset %d, length %d\n",
				section, offset, length);
			return ret;
		}
		offset += ret;
	}

	IWL_INFO(mvm, "NVM section %d read completed\n", section);
	return offset;
}

static struct iwl_nvm_data *
iwl_parse_nvm_sections(struct iwl_mvm *mvm)
{
	struct iwl_nvm_section *sections = mvm->nvm_sections;
	const __le16 *hw, *sw, *calib;

	/* Checking for required sections */
	if (!mvm->nvm_sections[NVM_SECTION_TYPE_SW].data ||
	    !mvm->nvm_sections[NVM_SECTION_TYPE_HW].data) {
		IWL_ERR(mvm, "Can't parse empty NVM sections\n");
		return NULL;
	}

	if (WARN_ON(!mvm->cfg))
		return NULL;

	hw = (const __le16 *)sections[NVM_SECTION_TYPE_HW].data;
	sw = (const __le16 *)sections[NVM_SECTION_TYPE_SW].data;
	calib = (const __le16 *)sections[NVM_SECTION_TYPE_CALIBRATION].data;
	return iwl_parse_nvm_data(mvm->trans->dev, mvm->cfg, hw, sw, calib);
}

int iwl_nvm_init(struct iwl_mvm *mvm)
{
	int ret, i, section;
	u8 *nvm_buffer, *temp;

	/* TODO: find correct NVM max size for a section */
	nvm_buffer = kmalloc(mvm->cfg->base_params->eeprom_size,
			     GFP_KERNEL);
	if (!nvm_buffer)
		return -ENOMEM;
	for (i = 0; i < ARRAY_SIZE(nvm_to_read); i++) {
		section = nvm_to_read[i];
		/* we override the constness for initial read */
		ret = iwl_nvm_read_section(mvm, section, nvm_buffer);
		if (ret < 0)
			break;
		temp = kmemdup(nvm_buffer, ret, GFP_KERNEL);
		if (!temp) {
			ret = -ENOMEM;
			break;
		}
		mvm->nvm_sections[section].data = temp;
		mvm->nvm_sections[section].length = ret;
	}
	kfree(nvm_buffer);
	if (ret < 0)
		return ret;

	ret = 0;
	mvm->nvm_data = iwl_parse_nvm_sections(mvm);

	return ret;
}