net: phy: dp83td510: Add support for the DP83TD510 Ethernet PHY
The DP83TD510E is an ultra-low power Ethernet physical layer transceiver that supports 10M single pair cable. This driver was tested with NXP SJA1105, STMMAC and ASIX AX88772B USB Ethernet controller. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oleksij Rempel
David S. Miller
Родитель
2013ad8836
Коммит
165cd04fe2
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@ -342,6 +342,12 @@ config DP83869_PHY
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Currently supports the DP83869 PHY. This PHY supports copper and
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fiber connections.
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config DP83TD510_PHY
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tristate "Texas Instruments DP83TD510 Ethernet 10Base-T1L PHY"
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help
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Support for the DP83TD510 Ethernet 10Base-T1L PHY. This PHY supports
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a 10M single pair Ethernet connection for up to 1000 meter cable.
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config VITESSE_PHY
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tristate "Vitesse PHYs"
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help
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@ -57,6 +57,7 @@ obj-$(CONFIG_DP83848_PHY) += dp83848.o
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obj-$(CONFIG_DP83867_PHY) += dp83867.o
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obj-$(CONFIG_DP83869_PHY) += dp83869.o
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obj-$(CONFIG_DP83TC811_PHY) += dp83tc811.o
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obj-$(CONFIG_DP83TD510_PHY) += dp83td510.o
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obj-$(CONFIG_FIXED_PHY) += fixed_phy.o
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obj-$(CONFIG_ICPLUS_PHY) += icplus.o
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obj-$(CONFIG_INTEL_XWAY_PHY) += intel-xway.o
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@ -0,0 +1,209 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Driver for the Texas Instruments DP83TD510 PHY
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* Copyright (c) 2022 Pengutronix, Oleksij Rempel <kernel@pengutronix.de>
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*/
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#include <linux/bitfield.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/phy.h>
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#define DP83TD510E_PHY_ID 0x20000181
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/* MDIO_MMD_VEND2 registers */
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#define DP83TD510E_PHY_STS 0x10
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#define DP83TD510E_STS_MII_INT BIT(7)
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#define DP83TD510E_LINK_STATUS BIT(0)
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#define DP83TD510E_GEN_CFG 0x11
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#define DP83TD510E_GENCFG_INT_POLARITY BIT(3)
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#define DP83TD510E_GENCFG_INT_EN BIT(1)
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#define DP83TD510E_GENCFG_INT_OE BIT(0)
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#define DP83TD510E_INTERRUPT_REG_1 0x12
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#define DP83TD510E_INT1_LINK BIT(13)
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#define DP83TD510E_INT1_LINK_EN BIT(5)
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#define DP83TD510E_AN_STAT_1 0x60c
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#define DP83TD510E_MASTER_SLAVE_RESOL_FAIL BIT(15)
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static int dp83td510_config_intr(struct phy_device *phydev)
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{
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int ret;
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if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
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/* Clear any pending interrupts */
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ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PHY_STS,
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0x0);
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if (ret)
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return ret;
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ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
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DP83TD510E_INTERRUPT_REG_1,
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DP83TD510E_INT1_LINK_EN);
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if (ret)
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return ret;
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ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND2,
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DP83TD510E_GEN_CFG,
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DP83TD510E_GENCFG_INT_POLARITY |
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DP83TD510E_GENCFG_INT_EN |
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DP83TD510E_GENCFG_INT_OE);
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} else {
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ret = phy_write_mmd(phydev, MDIO_MMD_VEND2,
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DP83TD510E_INTERRUPT_REG_1, 0x0);
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if (ret)
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return ret;
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ret = phy_clear_bits_mmd(phydev, MDIO_MMD_VEND2,
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DP83TD510E_GEN_CFG,
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DP83TD510E_GENCFG_INT_EN);
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if (ret)
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return ret;
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/* Clear any pending interrupts */
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ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PHY_STS,
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0x0);
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}
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return ret;
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}
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static irqreturn_t dp83td510_handle_interrupt(struct phy_device *phydev)
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{
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int ret;
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ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_PHY_STS);
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if (ret < 0) {
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phy_error(phydev);
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return IRQ_NONE;
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} else if (!(ret & DP83TD510E_STS_MII_INT)) {
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return IRQ_NONE;
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}
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/* Read the current enabled interrupts */
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ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, DP83TD510E_INTERRUPT_REG_1);
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if (ret < 0) {
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phy_error(phydev);
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return IRQ_NONE;
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} else if (!(ret & DP83TD510E_INT1_LINK_EN) ||
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!(ret & DP83TD510E_INT1_LINK)) {
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return IRQ_NONE;
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}
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phy_trigger_machine(phydev);
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return IRQ_HANDLED;
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}
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static int dp83td510_read_status(struct phy_device *phydev)
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{
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u16 phy_sts;
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int ret;
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phydev->speed = SPEED_UNKNOWN;
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phydev->duplex = DUPLEX_UNKNOWN;
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phydev->pause = 0;
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phydev->asym_pause = 0;
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linkmode_zero(phydev->lp_advertising);
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phy_sts = phy_read(phydev, DP83TD510E_PHY_STS);
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phydev->link = !!(phy_sts & DP83TD510E_LINK_STATUS);
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if (phydev->link) {
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/* This PHY supports only one link mode: 10BaseT1L_Full */
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phydev->duplex = DUPLEX_FULL;
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phydev->speed = SPEED_10;
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if (phydev->autoneg == AUTONEG_ENABLE) {
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ret = genphy_c45_read_lpa(phydev);
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if (ret)
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return ret;
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phy_resolve_aneg_linkmode(phydev);
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}
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}
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if (phydev->autoneg == AUTONEG_ENABLE) {
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ret = genphy_c45_baset1_read_status(phydev);
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if (ret < 0)
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return ret;
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ret = phy_read_mmd(phydev, MDIO_MMD_VEND2,
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DP83TD510E_AN_STAT_1);
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if (ret < 0)
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return ret;
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if (ret & DP83TD510E_MASTER_SLAVE_RESOL_FAIL)
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phydev->master_slave_state = MASTER_SLAVE_STATE_ERR;
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} else {
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return genphy_c45_pma_baset1_read_master_slave(phydev);
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}
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return 0;
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}
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static int dp83td510_config_aneg(struct phy_device *phydev)
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{
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bool changed = false;
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int ret;
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ret = genphy_c45_pma_baset1_setup_master_slave(phydev);
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if (ret < 0)
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return ret;
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if (phydev->autoneg == AUTONEG_DISABLE)
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return genphy_c45_an_disable_aneg(phydev);
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ret = genphy_c45_an_config_aneg(phydev);
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if (ret < 0)
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return ret;
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if (ret > 0)
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changed = true;
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return genphy_c45_check_and_restart_aneg(phydev, changed);
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}
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static int dp83td510_get_features(struct phy_device *phydev)
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{
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/* This PHY can't respond on MDIO bus if no RMII clock is enabled.
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* In case RMII mode is used (most meaningful mode for this PHY) and
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* the PHY do not have own XTAL, and CLK providing MAC is not probed,
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* we won't be able to read all needed ability registers.
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* So provide it manually.
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*/
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linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
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linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported);
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linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported);
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linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT1L_Full_BIT,
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phydev->supported);
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return 0;
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}
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static struct phy_driver dp83td510_driver[] = {
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{
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PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID),
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.name = "TI DP83TD510E",
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.config_aneg = dp83td510_config_aneg,
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.read_status = dp83td510_read_status,
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.get_features = dp83td510_get_features,
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.config_intr = dp83td510_config_intr,
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.handle_interrupt = dp83td510_handle_interrupt,
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.suspend = genphy_suspend,
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.resume = genphy_resume,
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} };
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module_phy_driver(dp83td510_driver);
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static struct mdio_device_id __maybe_unused dp83td510_tbl[] = {
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{ PHY_ID_MATCH_MODEL(DP83TD510E_PHY_ID) },
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{ }
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};
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MODULE_DEVICE_TABLE(mdio, dp83td510_tbl);
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MODULE_DESCRIPTION("Texas Instruments DP83TD510E PHY driver");
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MODULE_AUTHOR("Oleksij Rempel <kernel@pengutronix.de>");
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MODULE_LICENSE("GPL v2");
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