1// SPDX-License-Identifier: ISC
2/* Copyright (C) 2020 MediaTek Inc. */
3
4#include "mt7915.h"
5#include "eeprom.h"
6
7static inline bool mt7915_efuse_valid(u8 val)
8{
9	return !(val == 0xff);
10}
11
12u32 mt7915_eeprom_read(struct mt7915_dev *dev, u32 offset)
13{
14	u8 *data = dev->mt76.eeprom.data;
15
16	if (!mt7915_efuse_valid(data[offset]))
17		mt7915_mcu_get_eeprom(dev, offset);
18
19	return data[offset];
20}
21
22static int mt7915_eeprom_load(struct mt7915_dev *dev)
23{
24	int ret;
25
26	ret = mt76_eeprom_init(&dev->mt76, MT7915_EEPROM_SIZE);
27	if (ret < 0)
28		return ret;
29
30	memset(dev->mt76.eeprom.data, -1, MT7915_EEPROM_SIZE);
31
32	return 0;
33}
34
35static int mt7915_check_eeprom(struct mt7915_dev *dev)
36{
37	u16 val;
38	u8 *eeprom = dev->mt76.eeprom.data;
39
40	mt7915_eeprom_read(dev, 0);
41	val = get_unaligned_le16(eeprom);
42
43	switch (val) {
44	case 0x7915:
45		return 0;
46	default:
47		return -EINVAL;
48	}
49}
50
51static void mt7915_eeprom_parse_hw_cap(struct mt7915_dev *dev)
52{
53	u8 *eeprom = dev->mt76.eeprom.data;
54	u8 tx_mask, max_nss = 4;
55	u32 val = mt7915_eeprom_read(dev, MT_EE_WIFI_CONF);
56
57	val = FIELD_GET(MT_EE_WIFI_CONF_BAND_SEL, val);
58	switch (val) {
59	case MT_EE_5GHZ:
60		dev->mphy.cap.has_5ghz = true;
61		break;
62	case MT_EE_2GHZ:
63		dev->mphy.cap.has_2ghz = true;
64		break;
65	default:
66		dev->mphy.cap.has_2ghz = true;
67		dev->mphy.cap.has_5ghz = true;
68		break;
69	}
70
71	/* read tx mask from eeprom */
72	tx_mask =  FIELD_GET(MT_EE_WIFI_CONF_TX_MASK,
73			     eeprom[MT_EE_WIFI_CONF]);
74	if (!tx_mask || tx_mask > max_nss)
75		tx_mask = max_nss;
76
77	dev->chainmask = BIT(tx_mask) - 1;
78	dev->mphy.antenna_mask = dev->chainmask;
79	dev->phy.chainmask = dev->chainmask;
80}
81
82int mt7915_eeprom_init(struct mt7915_dev *dev)
83{
84	int ret;
85
86	ret = mt7915_eeprom_load(dev);
87	if (ret < 0)
88		return ret;
89
90	ret = mt7915_check_eeprom(dev);
91	if (ret)
92		return ret;
93
94	mt7915_eeprom_parse_hw_cap(dev);
95	memcpy(dev->mt76.macaddr, dev->mt76.eeprom.data + MT_EE_MAC_ADDR,
96	       ETH_ALEN);
97
98	mt76_eeprom_override(&dev->mt76);
99
100	return 0;
101}
102
103int mt7915_eeprom_get_target_power(struct mt7915_dev *dev,
104				   struct ieee80211_channel *chan,
105				   u8 chain_idx)
106{
107	int index, target_power;
108	bool tssi_on;
109
110	if (chain_idx > 3)
111		return -EINVAL;
112
113	tssi_on = mt7915_tssi_enabled(dev, chan->band);
114
115	if (chan->band == NL80211_BAND_2GHZ) {
116		index = MT_EE_TX0_POWER_2G + chain_idx * 3;
117		target_power = mt7915_eeprom_read(dev, index);
118
119		if (!tssi_on)
120			target_power += mt7915_eeprom_read(dev, index + 1);
121	} else {
122		int group = mt7915_get_channel_group(chan->hw_value);
123
124		index = MT_EE_TX0_POWER_5G + chain_idx * 12;
125		target_power = mt7915_eeprom_read(dev, index + group);
126
127		if (!tssi_on)
128			target_power += mt7915_eeprom_read(dev, index + 8);
129	}
130
131	return target_power;
132}
133
134static const u8 sku_cck_delta_map[] = {
135	SKU_CCK_GROUP0,
136	SKU_CCK_GROUP0,
137	SKU_CCK_GROUP1,
138	SKU_CCK_GROUP1,
139};
140
141static const u8 sku_ofdm_delta_map[] = {
142	SKU_OFDM_GROUP0,
143	SKU_OFDM_GROUP0,
144	SKU_OFDM_GROUP1,
145	SKU_OFDM_GROUP1,
146	SKU_OFDM_GROUP2,
147	SKU_OFDM_GROUP2,
148	SKU_OFDM_GROUP3,
149	SKU_OFDM_GROUP4,
150};
151
152static const u8 sku_mcs_delta_map[] = {
153	SKU_MCS_GROUP0,
154	SKU_MCS_GROUP1,
155	SKU_MCS_GROUP1,
156	SKU_MCS_GROUP2,
157	SKU_MCS_GROUP2,
158	SKU_MCS_GROUP3,
159	SKU_MCS_GROUP4,
160	SKU_MCS_GROUP5,
161	SKU_MCS_GROUP6,
162	SKU_MCS_GROUP7,
163	SKU_MCS_GROUP8,
164	SKU_MCS_GROUP9,
165};
166
167#define SKU_GROUP(_mode, _len, _ofs_2g, _ofs_5g, _map)	\
168	[_mode] = {					\
169	.len = _len,					\
170	.offset = {					\
171		_ofs_2g,				\
172		_ofs_5g,				\
173	},						\
174	.delta_map = _map				\
175}
176
177const struct sku_group mt7915_sku_groups[] = {
178	SKU_GROUP(SKU_CCK, 4, 0x252, 0, sku_cck_delta_map),
179	SKU_GROUP(SKU_OFDM, 8, 0x254, 0x29d, sku_ofdm_delta_map),
180
181	SKU_GROUP(SKU_HT_BW20, 8, 0x259, 0x2a2, sku_mcs_delta_map),
182	SKU_GROUP(SKU_HT_BW40, 9, 0x262, 0x2ab, sku_mcs_delta_map),
183	SKU_GROUP(SKU_VHT_BW20, 12, 0x259, 0x2a2, sku_mcs_delta_map),
184	SKU_GROUP(SKU_VHT_BW40, 12, 0x262, 0x2ab, sku_mcs_delta_map),
185	SKU_GROUP(SKU_VHT_BW80, 12, 0, 0x2b4, sku_mcs_delta_map),
186	SKU_GROUP(SKU_VHT_BW160, 12, 0, 0, sku_mcs_delta_map),
187
188	SKU_GROUP(SKU_HE_RU26, 12, 0x27f, 0x2dd, sku_mcs_delta_map),
189	SKU_GROUP(SKU_HE_RU52, 12, 0x289, 0x2e7, sku_mcs_delta_map),
190	SKU_GROUP(SKU_HE_RU106, 12, 0x293, 0x2f1, sku_mcs_delta_map),
191	SKU_GROUP(SKU_HE_RU242, 12, 0x26b, 0x2bf, sku_mcs_delta_map),
192	SKU_GROUP(SKU_HE_RU484, 12, 0x275, 0x2c9, sku_mcs_delta_map),
193	SKU_GROUP(SKU_HE_RU996, 12, 0, 0x2d3, sku_mcs_delta_map),
194	SKU_GROUP(SKU_HE_RU2x996, 12, 0, 0, sku_mcs_delta_map),
195};
196
197static s8
198mt7915_get_sku_delta(struct mt7915_dev *dev, u32 addr)
199{
200	u32 val = mt7915_eeprom_read(dev, addr);
201	s8 delta = FIELD_GET(SKU_DELTA_VAL, val);
202
203	if (!(val & SKU_DELTA_EN))
204		return 0;
205
206	return val & SKU_DELTA_ADD ? delta : -delta;
207}
208
209static void
210mt7915_eeprom_init_sku_band(struct mt7915_dev *dev,
211			    struct ieee80211_supported_band *sband)
212{
213	int i, band = sband->band;
214	s8 *rate_power = dev->rate_power[band], max_delta = 0;
215	u8 idx = 0;
216
217	for (i = 0; i < ARRAY_SIZE(mt7915_sku_groups); i++) {
218		const struct sku_group *sku = &mt7915_sku_groups[i];
219		u32 offset = sku->offset[band];
220		int j;
221
222		if (!offset) {
223			idx += sku->len;
224			continue;
225		}
226
227		rate_power[idx++] = mt7915_get_sku_delta(dev, offset);
228		if (rate_power[idx - 1] > max_delta)
229			max_delta = rate_power[idx - 1];
230
231		if (i == SKU_HT_BW20 || i == SKU_VHT_BW20)
232			offset += 1;
233
234		for (j = 1; j < sku->len; j++) {
235			u32 addr = offset + sku->delta_map[j];
236
237			rate_power[idx++] = mt7915_get_sku_delta(dev, addr);
238			if (rate_power[idx - 1] > max_delta)
239				max_delta = rate_power[idx - 1];
240		}
241	}
242
243	rate_power[idx] = max_delta;
244}
245
246void mt7915_eeprom_init_sku(struct mt7915_dev *dev)
247{
248	mt7915_eeprom_init_sku_band(dev, &dev->mphy.sband_2g.sband);
249	mt7915_eeprom_init_sku_band(dev, &dev->mphy.sband_5g.sband);
250}
251