1// SPDX-License-Identifier: ISC
2
3#include <linux/of.h>
4#include "mt7603.h"
5#include "eeprom.h"
6
7static int
8mt7603_efuse_read(struct mt7603_dev *dev, u32 base, u16 addr, u8 *data)
9{
10	u32 val;
11	int i;
12
13	val = mt76_rr(dev, base + MT_EFUSE_CTRL);
14	val &= ~(MT_EFUSE_CTRL_AIN |
15		 MT_EFUSE_CTRL_MODE);
16	val |= FIELD_PREP(MT_EFUSE_CTRL_AIN, addr & ~0xf);
17	val |= MT_EFUSE_CTRL_KICK;
18	mt76_wr(dev, base + MT_EFUSE_CTRL, val);
19
20	if (!mt76_poll(dev, base + MT_EFUSE_CTRL, MT_EFUSE_CTRL_KICK, 0, 1000))
21		return -ETIMEDOUT;
22
23	udelay(2);
24
25	val = mt76_rr(dev, base + MT_EFUSE_CTRL);
26	if ((val & MT_EFUSE_CTRL_AOUT) == MT_EFUSE_CTRL_AOUT ||
27	    WARN_ON_ONCE(!(val & MT_EFUSE_CTRL_VALID))) {
28		memset(data, 0xff, 16);
29		return 0;
30	}
31
32	for (i = 0; i < 4; i++) {
33		val = mt76_rr(dev, base + MT_EFUSE_RDATA(i));
34		put_unaligned_le32(val, data + 4 * i);
35	}
36
37	return 0;
38}
39
40static int
41mt7603_efuse_init(struct mt7603_dev *dev)
42{
43	u32 base = mt7603_reg_map(dev, MT_EFUSE_BASE);
44	int len = MT7603_EEPROM_SIZE;
45	void *buf;
46	int ret, i;
47
48	if (mt76_rr(dev, base + MT_EFUSE_BASE_CTRL) & MT_EFUSE_BASE_CTRL_EMPTY)
49		return 0;
50
51	dev->mt76.otp.data = devm_kzalloc(dev->mt76.dev, len, GFP_KERNEL);
52	dev->mt76.otp.size = len;
53	if (!dev->mt76.otp.data)
54		return -ENOMEM;
55
56	buf = dev->mt76.otp.data;
57	for (i = 0; i + 16 <= len; i += 16) {
58		ret = mt7603_efuse_read(dev, base, i, buf + i);
59		if (ret)
60			return ret;
61	}
62
63	return 0;
64}
65
66static bool
67mt7603_has_cal_free_data(struct mt7603_dev *dev, u8 *efuse)
68{
69	if (!efuse[MT_EE_TEMP_SENSOR_CAL])
70		return false;
71
72	if (get_unaligned_le16(efuse + MT_EE_TX_POWER_0_START_2G) == 0)
73		return false;
74
75	if (get_unaligned_le16(efuse + MT_EE_TX_POWER_1_START_2G) == 0)
76		return false;
77
78	if (!efuse[MT_EE_CP_FT_VERSION])
79		return false;
80
81	if (!efuse[MT_EE_XTAL_FREQ_OFFSET])
82		return false;
83
84	if (!efuse[MT_EE_XTAL_WF_RFCAL])
85		return false;
86
87	return true;
88}
89
90static void
91mt7603_apply_cal_free_data(struct mt7603_dev *dev, u8 *efuse)
92{
93	static const u8 cal_free_bytes[] = {
94		MT_EE_TEMP_SENSOR_CAL,
95		MT_EE_CP_FT_VERSION,
96		MT_EE_XTAL_FREQ_OFFSET,
97		MT_EE_XTAL_WF_RFCAL,
98		/* Skip for MT7628 */
99		MT_EE_TX_POWER_0_START_2G,
100		MT_EE_TX_POWER_0_START_2G + 1,
101		MT_EE_TX_POWER_1_START_2G,
102		MT_EE_TX_POWER_1_START_2G + 1,
103	};
104	struct device_node *np = dev->mt76.dev->of_node;
105	u8 *eeprom = dev->mt76.eeprom.data;
106	int n = ARRAY_SIZE(cal_free_bytes);
107	int i;
108
109	if (!np || !of_property_read_bool(np, "mediatek,eeprom-merge-otp"))
110		return;
111
112	if (!mt7603_has_cal_free_data(dev, efuse))
113		return;
114
115	if (is_mt7628(dev))
116		n -= 4;
117
118	for (i = 0; i < n; i++) {
119		int offset = cal_free_bytes[i];
120
121		eeprom[offset] = efuse[offset];
122	}
123}
124
125static int
126mt7603_eeprom_load(struct mt7603_dev *dev)
127{
128	int ret;
129
130	ret = mt76_eeprom_init(&dev->mt76, MT7603_EEPROM_SIZE);
131	if (ret < 0)
132		return ret;
133
134	return mt7603_efuse_init(dev);
135}
136
137static int mt7603_check_eeprom(struct mt76_dev *dev)
138{
139	u16 val = get_unaligned_le16(dev->eeprom.data);
140
141	switch (val) {
142	case 0x7628:
143	case 0x7603:
144	case 0x7600:
145		return 0;
146	default:
147		return -EINVAL;
148	}
149}
150
151static inline bool is_mt7688(struct mt7603_dev *dev)
152{
153	return mt76_rr(dev, MT_EFUSE_BASE + 0x64) & BIT(4);
154}
155
156int mt7603_eeprom_init(struct mt7603_dev *dev)
157{
158	u8 *eeprom;
159	int ret;
160
161	ret = mt7603_eeprom_load(dev);
162	if (ret < 0)
163		return ret;
164
165	if (dev->mt76.otp.data) {
166		if (mt7603_check_eeprom(&dev->mt76) == 0)
167			mt7603_apply_cal_free_data(dev, dev->mt76.otp.data);
168		else
169			memcpy(dev->mt76.eeprom.data, dev->mt76.otp.data,
170			       MT7603_EEPROM_SIZE);
171	}
172
173	eeprom = (u8 *)dev->mt76.eeprom.data;
174	dev->mphy.cap.has_2ghz = true;
175	memcpy(dev->mphy.macaddr, eeprom + MT_EE_MAC_ADDR, ETH_ALEN);
176
177	/* Check for 1SS devices */
178	dev->mphy.antenna_mask = 3;
179	if (FIELD_GET(MT_EE_NIC_CONF_0_RX_PATH, eeprom[MT_EE_NIC_CONF_0]) == 1 ||
180	    FIELD_GET(MT_EE_NIC_CONF_0_TX_PATH, eeprom[MT_EE_NIC_CONF_0]) == 1 ||
181	    is_mt7688(dev))
182		dev->mphy.antenna_mask = 1;
183
184	mt76_eeprom_override(&dev->mphy);
185
186	return 0;
187}
188