eeprom.c

  1// SPDX-License-Identifier: BSD-3-Clause-Clear
  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	dev->mphy.chainmask = dev->mphy.antenna_mask;
185
186	return mt76_eeprom_override(&dev->mphy);
187}