cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

eeprom.c (3938B)

      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}