summaryrefslogtreecommitdiff
path: root/drivers/net/wireless/mediatek/mt7601u/eeprom.c
blob: d4d31a54655692e29bbed3ad8999c9eb9f286b8e (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
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
 * Copyright (C) 2015 Jakub Kicinski <kubakici@wp.pl>
 */

#include <linux/of.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/etherdevice.h>
#include <linux/unaligned.h>
#include "mt7601u.h"
#include "eeprom.h"
#include "mac.h"

static bool
field_valid(u8 val)
{
	return val != 0xff;
}

static s8
field_validate(u8 val)
{
	if (!field_valid(val))
		return 0;

	return val;
}

static int
mt7601u_efuse_read(struct mt7601u_dev *dev, u16 addr, u8 *data,
		   enum mt7601u_eeprom_access_modes mode)
{
	u32 val;
	int i;

	val = mt76_rr(dev, MT_EFUSE_CTRL);
	val &= ~(MT_EFUSE_CTRL_AIN |
		 MT_EFUSE_CTRL_MODE);
	val |= FIELD_PREP(MT_EFUSE_CTRL_AIN, addr & ~0xf) |
	       FIELD_PREP(MT_EFUSE_CTRL_MODE, mode) |
	       MT_EFUSE_CTRL_KICK;
	mt76_wr(dev, MT_EFUSE_CTRL, val);

	if (!mt76_poll(dev, MT_EFUSE_CTRL, MT_EFUSE_CTRL_KICK, 0, 1000))
		return -ETIMEDOUT;

	val = mt76_rr(dev, MT_EFUSE_CTRL);
	if ((val & MT_EFUSE_CTRL_AOUT) == MT_EFUSE_CTRL_AOUT) {
		/* Parts of eeprom not in the usage map (0x80-0xc0,0xf0)
		 * will not return valid data but it's ok.
		 */
		memset(data, 0xff, 16);
		return 0;
	}

	for (i = 0; i < 4; i++) {
		val = mt76_rr(dev, MT_EFUSE_DATA(i));
		put_unaligned_le32(val, data + 4 * i);
	}

	return 0;
}

static int
mt7601u_efuse_physical_size_check(struct mt7601u_dev *dev)
{
	const int map_reads = DIV_ROUND_UP(MT_EFUSE_USAGE_MAP_SIZE, 16);
	u8 data[round_up(MT_EFUSE_USAGE_MAP_SIZE, 16)];
	int ret, i;
	u32 start = 0, end = 0, cnt_free;

	for (i = 0; i < map_reads; i++) {
		ret = mt7601u_efuse_read(dev, MT_EE_USAGE_MAP_START + i * 16,
					 data + i * 16, MT_EE_PHYSICAL_READ);
		if (ret)
			return ret;
	}

	for (i = 0; i < MT_EFUSE_USAGE_MAP_SIZE; i++)
		if (!data[i]) {
			if (!start)
				start = MT_EE_USAGE_MAP_START + i;
			end = MT_EE_USAGE_MAP_START + i;
		}
	cnt_free = end - start + 1;

	if (MT_EFUSE_USAGE_MAP_SIZE - cnt_free < 5) {
		dev_err(dev->dev, "Error: your device needs default EEPROM file and this driver doesn't support it!\n");
		return -EINVAL;
	}

	return 0;
}

static bool
mt7601u_has_tssi(struct mt7601u_dev *dev, u8 *eeprom)
{
	u16 nic_conf1 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_1);

	return (u16)~nic_conf1 && (nic_conf1 & MT_EE_NIC_CONF_1_TX_ALC_EN);
}

static void
mt7601u_set_chip_cap(struct mt7601u_dev *dev, u8 *eeprom)
{
	u16 nic_conf0 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_0);
	u16 nic_conf1 = get_unaligned_le16(eeprom + MT_EE_NIC_CONF_1);

	if (!field_valid(nic_conf1 & 0xff))
		nic_conf1 &= 0xff00;

	dev->ee->tssi_enabled = mt7601u_has_tssi(dev, eeprom) &&
				!(nic_conf1 & MT_EE_NIC_CONF_1_TEMP_TX_ALC);

	if (nic_conf1 & MT_EE_NIC_CONF_1_HW_RF_CTRL)
		dev_err(dev->dev,
			"Error: this driver does not support HW RF ctrl\n");

	if (!field_valid(nic_conf0 >> 8))
		return;

	if (FIELD_GET(MT_EE_NIC_CONF_0_RX_PATH, nic_conf0) > 1 ||
	    FIELD_GET(MT_EE_NIC_CONF_0_TX_PATH, nic_conf0) > 1)
		dev_err(dev->dev,
			"Error: device has more than 1 RX/TX stream!\n");
}

static void mt7601u_set_channel_target_power(struct mt7601u_dev *dev,
					     u8 *eeprom, u8 max_pwr)
{
	u8 trgt_pwr = eeprom[MT_EE_TX_TSSI_TARGET_POWER];

	if (trgt_pwr > max_pwr || !trgt_pwr) {
		dev_warn(dev->dev, "Error: EEPROM trgt power invalid %hhx!\n",
			 trgt_pwr);
		trgt_pwr = 0x20;
	}

	memset(dev->ee->chan_pwr, trgt_pwr, sizeof(dev->ee->chan_pwr));
}

static void
mt7601u_set_channel_power(struct mt7601u_dev *dev, u8 *eeprom)
{
	u32 i, val;
	u8 max_pwr;

	val = mt7601u_rr(dev, MT_TX_ALC_CFG_0);
	max_pwr = FIELD_GET(MT_TX_ALC_CFG_0_LIMIT_0, val);

	if (mt7601u_has_tssi(dev, eeprom)) {
		mt7601u_set_channel_target_power(dev, eeprom, max_pwr);
		return;
	}

	for (i = 0; i < 14; i++) {
		s8 power = field_validate(eeprom[MT_EE_TX_POWER_OFFSET + i]);

		if (power > max_pwr || power < 0)
			power = MT7601U_DEFAULT_TX_POWER;

		dev->ee->chan_pwr[i] = power;
	}
}

static void
mt7601u_set_country_reg(struct mt7601u_dev *dev, u8 *eeprom)
{
	/* Note: - region 31 is not valid for mt7601u (see rtmp_init.c)
	 *	 - comments in rtmp_def.h are incorrect (see rt_channel.c)
	 */
	static const struct reg_channel_bounds chan_bounds[] = {
		/* EEPROM country regions 0 - 7 */
		{  1, 11 },	{  1, 13 },	{ 10,  2 },	{ 10,  4 },
		{ 14,  1 },	{  1, 14 },	{  3,  7 },	{  5,  9 },
		/* EEPROM country regions 32 - 33 */
		{  1, 11 },	{  1, 14 }
	};
	u8 val = eeprom[MT_EE_COUNTRY_REGION];
	int idx = -1;

	if (val < 8)
		idx = val;
	if (val > 31 && val < 33)
		idx = val - 32 + 8;

	if (idx != -1)
		dev_info(dev->dev,
			 "EEPROM country region %02x (channels %d-%d)\n",
			 val, chan_bounds[idx].start,
			 chan_bounds[idx].start + chan_bounds[idx].num - 1);
	else
		idx = 5; /* channels 1 - 14 */

	dev->ee->reg = chan_bounds[idx];

	/* TODO: country region 33 is special - phy should be set to B-mode
	 *	 before entering channel 14 (see sta/connect.c)
	 */
}

static void
mt7601u_set_rf_freq_off(struct mt7601u_dev *dev, u8 *eeprom)
{
	u8 comp;

	dev->ee->rf_freq_off = field_validate(eeprom[MT_EE_FREQ_OFFSET]);
	comp = field_validate(eeprom[MT_EE_FREQ_OFFSET_COMPENSATION]);

	if (comp & BIT(7))
		dev->ee->rf_freq_off -= comp & 0x7f;
	else
		dev->ee->rf_freq_off += comp;
}

static void
mt7601u_set_rssi_offset(struct mt7601u_dev *dev, u8 *eeprom)
{
	int i;
	s8 *rssi_offset = dev->ee->rssi_offset;

	for (i = 0; i < 2; i++) {
		rssi_offset[i] = eeprom[MT_EE_RSSI_OFFSET + i];

		if (rssi_offset[i] < -10 || rssi_offset[i] > 10) {
			dev_warn(dev->dev,
				 "Warning: EEPROM RSSI is invalid %02hhx\n",
				 rssi_offset[i]);
			rssi_offset[i] = 0;
		}
	}
}

static void
mt7601u_extra_power_over_mac(struct mt7601u_dev *dev)
{
	u32 val;

	val = ((mt7601u_rr(dev, MT_TX_PWR_CFG_1) & 0x0000ff00) >> 8);
	val |= ((mt7601u_rr(dev, MT_TX_PWR_CFG_2) & 0x0000ff00) << 8);
	mt7601u_wr(dev, MT_TX_PWR_CFG_7, val);

	val = ((mt7601u_rr(dev, MT_TX_PWR_CFG_4) & 0x0000ff00) >> 8);
	mt7601u_wr(dev, MT_TX_PWR_CFG_9, val);
}

static void
mt7601u_set_power_rate(struct power_per_rate *rate, s8 delta, u8 value)
{
	/* Invalid? Note: vendor driver does not handle this */
	if (value == 0xff)
		return;

	rate->raw = s6_validate(value);
	rate->bw20 = s6_to_int(value);
	/* Note: vendor driver does cap the value to s6 right away */
	rate->bw40 = rate->bw20 + delta;
}

static void
mt7601u_save_power_rate(struct mt7601u_dev *dev, s8 delta, u32 val, int i)
{
	struct mt7601u_rate_power *t = &dev->ee->power_rate_table;

	switch (i) {
	case 0:
		mt7601u_set_power_rate(&t->cck[0], delta, (val >> 0) & 0xff);
		mt7601u_set_power_rate(&t->cck[1], delta, (val >> 8) & 0xff);
		/* Save cck bw20 for fixups of channel 14 */
		dev->ee->real_cck_bw20[0] = t->cck[0].bw20;
		dev->ee->real_cck_bw20[1] = t->cck[1].bw20;

		mt7601u_set_power_rate(&t->ofdm[0], delta, (val >> 16) & 0xff);
		mt7601u_set_power_rate(&t->ofdm[1], delta, (val >> 24) & 0xff);
		break;
	case 1:
		mt7601u_set_power_rate(&t->ofdm[2], delta, (val >> 0) & 0xff);
		mt7601u_set_power_rate(&t->ofdm[3], delta, (val >> 8) & 0xff);
		mt7601u_set_power_rate(&t->ht[0], delta, (val >> 16) & 0xff);
		mt7601u_set_power_rate(&t->ht[1], delta, (val >> 24) & 0xff);
		break;
	case 2:
		mt7601u_set_power_rate(&t->ht[2], delta, (val >> 0) & 0xff);
		mt7601u_set_power_rate(&t->ht[3], delta, (val >> 8) & 0xff);
		break;
	}
}

static s8
get_delta(u8 val)
{
	s8 ret;

	if (!field_valid(val) || !(val & BIT(7)))
		return 0;

	ret = val & 0x1f;
	if (ret > 8)
		ret = 8;
	if (val & BIT(6))
		ret = -ret;

	return ret;
}

static void
mt7601u_config_tx_power_per_rate(struct mt7601u_dev *dev, u8 *eeprom)
{
	u32 val;
	s8 bw40_delta;
	int i;

	bw40_delta = get_delta(eeprom[MT_EE_TX_POWER_DELTA_BW40]);

	for (i = 0; i < 5; i++) {
		val = get_unaligned_le32(eeprom + MT_EE_TX_POWER_BYRATE(i));

		mt7601u_save_power_rate(dev, bw40_delta, val, i);

		if (~val)
			mt7601u_wr(dev, MT_TX_PWR_CFG_0 + i * 4, val);
	}

	mt7601u_extra_power_over_mac(dev);
}

static void
mt7601u_init_tssi_params(struct mt7601u_dev *dev, u8 *eeprom)
{
	struct tssi_data *d = &dev->ee->tssi_data;

	if (!dev->ee->tssi_enabled)
		return;

	d->slope = eeprom[MT_EE_TX_TSSI_SLOPE];
	d->tx0_delta_offset = eeprom[MT_EE_TX_TSSI_OFFSET] * 1024;
	d->offset[0] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP];
	d->offset[1] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP + 1];
	d->offset[2] = eeprom[MT_EE_TX_TSSI_OFFSET_GROUP + 2];
}

int
mt7601u_eeprom_init(struct mt7601u_dev *dev)
{
	u8 *eeprom;
	int i, ret;

	ret = mt7601u_efuse_physical_size_check(dev);
	if (ret)
		return ret;

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

	eeprom = kmalloc(MT7601U_EEPROM_SIZE, GFP_KERNEL);
	if (!eeprom)
		return -ENOMEM;

	for (i = 0; i + 16 <= MT7601U_EEPROM_SIZE; i += 16) {
		ret = mt7601u_efuse_read(dev, i, eeprom + i, MT_EE_READ);
		if (ret)
			goto out;
	}

	if (eeprom[MT_EE_VERSION_EE] > MT7601U_EE_MAX_VER)
		dev_warn(dev->dev,
			 "Warning: unsupported EEPROM version %02hhx\n",
			 eeprom[MT_EE_VERSION_EE]);
	dev_info(dev->dev, "EEPROM ver:%02hhx fae:%02hhx\n",
		 eeprom[MT_EE_VERSION_EE], eeprom[MT_EE_VERSION_FAE]);

	mt7601u_set_macaddr(dev, eeprom + MT_EE_MAC_ADDR);
	mt7601u_set_chip_cap(dev, eeprom);
	mt7601u_set_channel_power(dev, eeprom);
	mt7601u_set_country_reg(dev, eeprom);
	mt7601u_set_rf_freq_off(dev, eeprom);
	mt7601u_set_rssi_offset(dev, eeprom);
	dev->ee->ref_temp = eeprom[MT_EE_REF_TEMP];
	dev->ee->lna_gain = eeprom[MT_EE_LNA_GAIN];

	mt7601u_config_tx_power_per_rate(dev, eeprom);

	mt7601u_init_tssi_params(dev, eeprom);
out:
	kfree(eeprom);
	return ret;
}