[PATCH net-next] net: phy: marvell: mv88e6390 temperature sensor reading
From: Andrew Lunn <andrew@lunn.ch>
Date: 2018-01-09 21:42:53
The internal PHYs in the mv88e6390 switch have a temperature sensor. It uses a different register layout to other PHY currently supported. It also has an errata, in that some reads of the sensor result in bad values. So a number of reads need to be made, and the average taken. Signed-off-by: Andrew Lunn <andrew@lunn.ch> --- drivers/net/phy/marvell.c | 151 +++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 150 insertions(+), 1 deletion(-)
diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index fd66304f18b7..22d9bc9c33a4 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c@@ -96,6 +96,17 @@ #define MII_88E1510_TEMP_SENSOR 0x1b #define MII_88E1510_TEMP_SENSOR_MASK 0xff +#define MII_88E6390_MISC_TEST 0x1b +#define MII_88E6390_MISC_TEST_SAMPLE_1S 0 +#define MII_88E6390_MISC_TEST_SAMPLE_10MS BIT(14) +#define MII_88E6390_MISC_TEST_SAMPLE_DISABLE BIT(15) +#define MII_88E6390_MISC_TEST_SAMPLE_ENABLE 0 +#define MII_88E6390_MISC_TEST_SAMPLE_MASK (0x3 << 14) + +#define MII_88E6390_TEMP_SENSOR 0x1c +#define MII_88E6390_TEMP_SENSOR_MASK 0xff +#define MII_88E6390_TEMP_SENSOR_SAMPLES 10 + #define MII_88E1318S_PHY_MSCR1_REG 16 #define MII_88E1318S_PHY_MSCR1_PAD_ODD BIT(6)
@@ -1738,6 +1749,123 @@ static const struct hwmon_chip_info m88e1510_hwmon_chip_info = { .info = m88e1510_hwmon_info, }; +static int m88e6390_get_temp(struct phy_device *phydev, long *temp) +{ + int sum = 0; + int oldpage; + int ret = 0; + int i; + + *temp = 0; + + oldpage = phy_select_page(phydev, MII_MARVELL_MISC_TEST_PAGE); + if (oldpage < 0) + goto error; + + /* Enable temperature sensor */ + ret = __phy_read(phydev, MII_88E6390_MISC_TEST); + if (ret < 0) + goto error; + + ret = ret & ~MII_88E6390_MISC_TEST_SAMPLE_MASK; + ret |= MII_88E6390_MISC_TEST_SAMPLE_ENABLE | + MII_88E6390_MISC_TEST_SAMPLE_1S; + + ret = __phy_write(phydev, MII_88E6390_MISC_TEST, ret); + if (ret < 0) + goto error; + + /* Wait for temperature to stabilize */ + usleep_range(10000, 12000); + + /* Reading the temperature sense has an errata. You need to read + * a number of times and take an average. + */ + for (i = 0; i < MII_88E6390_TEMP_SENSOR_SAMPLES; i++) { + ret = __phy_read(phydev, MII_88E6390_TEMP_SENSOR); + if (ret < 0) + goto error; + sum += ret & MII_88E6390_TEMP_SENSOR_MASK; + } + + sum /= MII_88E6390_TEMP_SENSOR_SAMPLES; + *temp = (sum - 75) * 1000; + + /* Disable temperature sensor */ + ret = __phy_read(phydev, MII_88E6390_MISC_TEST); + if (ret < 0) + goto error; + + ret = ret & ~MII_88E6390_MISC_TEST_SAMPLE_MASK; + ret |= MII_88E6390_MISC_TEST_SAMPLE_DISABLE; + + ret = __phy_write(phydev, MII_88E6390_MISC_TEST, ret); + +error: + phy_restore_page(phydev, oldpage, ret); + + return ret; +} + +static int m88e6390_hwmon_read(struct device *dev, + enum hwmon_sensor_types type, + u32 attr, int channel, long *temp) +{ + struct phy_device *phydev = dev_get_drvdata(dev); + int err; + + switch (attr) { + case hwmon_temp_input: + err = m88e6390_get_temp(phydev, temp); + break; + default: + return -EOPNOTSUPP; + } + + return err; +} + +static umode_t m88e6390_hwmon_is_visible(const void *data, + enum hwmon_sensor_types type, + u32 attr, int channel) +{ + if (type != hwmon_temp) + return 0; + + switch (attr) { + case hwmon_temp_input: + return 0444; + default: + return 0; + } +} + +static u32 m88e6390_hwmon_temp_config[] = { + HWMON_T_INPUT, + 0 +}; + +static const struct hwmon_channel_info m88e6390_hwmon_temp = { + .type = hwmon_temp, + .config = m88e6390_hwmon_temp_config, +}; + +static const struct hwmon_channel_info *m88e6390_hwmon_info[] = { + &m88e1121_hwmon_chip, + &m88e6390_hwmon_temp, + NULL +}; + +static const struct hwmon_ops m88e6390_hwmon_hwmon_ops = { + .is_visible = m88e6390_hwmon_is_visible, + .read = m88e6390_hwmon_read, +}; + +static const struct hwmon_chip_info m88e6390_hwmon_chip_info = { + .ops = &m88e6390_hwmon_hwmon_ops, + .info = m88e6390_hwmon_info, +}; + static int marvell_hwmon_name(struct phy_device *phydev) { struct marvell_priv *priv = phydev->priv;
@@ -1784,6 +1912,11 @@ static int m88e1510_hwmon_probe(struct phy_device *phydev) { return marvell_hwmon_probe(phydev, &m88e1510_hwmon_chip_info); } + +static int m88e6390_hwmon_probe(struct phy_device *phydev) +{ + return marvell_hwmon_probe(phydev, &m88e6390_hwmon_chip_info); +} #else static int m88e1121_hwmon_probe(struct phy_device *phydev) {
@@ -1794,6 +1927,11 @@ static int m88e1510_hwmon_probe(struct phy_device *phydev) { return 0; } + +static int m88e6390_hwmon_probe(struct phy_device *phydev) +{ + return 0; +} #endif static int marvell_probe(struct phy_device *phydev)
@@ -1831,6 +1969,17 @@ static int m88e1510_probe(struct phy_device *phydev) return m88e1510_hwmon_probe(phydev); } +static int m88e6390_probe(struct phy_device *phydev) +{ + int err; + + err = marvell_probe(phydev); + if (err) + return err; + + return m88e6390_hwmon_probe(phydev); +} + static struct phy_driver marvell_drivers[] = { { .phy_id = MARVELL_PHY_ID_88E1101,
@@ -2122,7 +2271,7 @@ static struct phy_driver marvell_drivers[] = { .name = "Marvell 88E6390", .features = PHY_GBIT_FEATURES, .flags = PHY_HAS_INTERRUPT, - .probe = m88e1510_probe, + .probe = m88e6390_probe, .config_init = &marvell_config_init, .config_aneg = &m88e1510_config_aneg, .read_status = &marvell_read_status,
--
2.15.1