Messages in this thread Patch in this message |  | | Date | Sun, 4 Dec 2022 03:31:33 +0100 | From | Piergiorgio Beruto <> | Subject | [PATCH net-next 3/4] drivers/net/phy: Add driver for the onsemi NCN26000 10BASE-T1S PHY |
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Add support for the onsemi NCN26000 10BASE-T1S industrial Ethernet PHY. The driver supports Point-to-Multipoint operation without auto-negotiation and with link control handling. The PLCA RS support will be included on a separate patch.
Signed-off-by: Piergiorgio Beruto <piergiorgio.beruto@gmail.com> --- MAINTAINERS | 7 ++ drivers/net/phy/Kconfig | 7 ++ drivers/net/phy/Makefile | 1 + drivers/net/phy/ncn26000.c | 193 +++++++++++++++++++++++++++++++++++++ 4 files changed, 208 insertions(+) create mode 100644 drivers/net/phy/ncn26000.c
diff --git a/MAINTAINERS b/MAINTAINERS index 7952243e4b43..f07527baf321 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -15357,6 +15357,13 @@ L: linux-mips@vger.kernel.org S: Maintained F: arch/mips/boot/dts/ralink/omega2p.dts +ONSEMI ETHERNET PHY DRIVERS +M: Piergiorgio Beruto <piergiorgio.beruto@gmail.com> +L: netdev@vger.kernel.org +S: Supported +W: http://www.onsemi.com +F: drivers/net/phy/ncn* + OP-TEE DRIVER M: Jens Wiklander <jens.wiklander@linaro.org> L: op-tee@lists.trustedfirmware.org diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index af00cf44cd97..7c466830c611 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -267,6 +267,13 @@ config NATIONAL_PHY help Currently supports the DP83865 PHY. +config NCN26000_PHY + tristate "onsemi 10BASE-T1S Ethernet PHY" + help + Adds support for the onsemi 10BASE-T1S Ethernet PHY. + Currently supports the NCN26000 10BASE-T1S Industrial PHY + with MII interface. + config NXP_C45_TJA11XX_PHY tristate "NXP C45 TJA11XX PHYs" depends on PTP_1588_CLOCK_OPTIONAL diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile index f7138d3c896b..b5138066ba04 100644 --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_MICROCHIP_T1_PHY) += microchip_t1.o obj-$(CONFIG_MICROSEMI_PHY) += mscc/ obj-$(CONFIG_MOTORCOMM_PHY) += motorcomm.o obj-$(CONFIG_NATIONAL_PHY) += national.o +obj-$(CONFIG_NCN26000_PHY) += ncn26000.o obj-$(CONFIG_NXP_C45_TJA11XX_PHY) += nxp-c45-tja11xx.o obj-$(CONFIG_NXP_TJA11XX_PHY) += nxp-tja11xx.o obj-$(CONFIG_QSEMI_PHY) += qsemi.o diff --git a/drivers/net/phy/ncn26000.c b/drivers/net/phy/ncn26000.c new file mode 100644 index 000000000000..65a34edc5b20 --- /dev/null +++ b/drivers/net/phy/ncn26000.c @@ -0,0 +1,193 @@ +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) +/* + * Driver for Analog Devices Industrial Ethernet T1L PHYs + * + * Copyright 2020 Analog Devices Inc. + */ +#include <linux/kernel.h> +#include <linux/bitfield.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mii.h> +#include <linux/phy.h> +#include <linux/property.h> + +#define PHY_ID_NCN26000 0x180FF5A1 + +#define NCN26000_REG_IRQ_CTL ((u16)16) +#define NCN26000_REG_IRQ_STATUS ((u16)17) + +#define NCN26000_IRQ_LINKST_BIT ((u16)1) +#define NCN26000_IRQ_PLCAST_BIT ((u16)(1 << 1)) +#define NCN26000_IRQ_LJABBER_BIT ((u16)(1 << 2)) +#define NCN26000_IRQ_RJABBER_BIT ((u16)(1 << 3)) +#define NCN26000_IRQ_RJABBER_BIT ((u16)(1 << 3)) +#define NCN26000_IRQ_PLCAREC_BIT ((u16)(1 << 4)) +#define NCN26000_IRQ_PHYSCOL_BIT ((u16)(1 << 5)) + +struct ncn26000_priv { + u16 enabled_irqs; +}; + +static int ncn26000_config_init(struct phy_device *phydev) +{ + // TODO: add vendor-specific tuning (ENI, CMC, ...) + return 0; +} + +static int ncn26000_enable(struct phy_device *phydev) +{ + phydev->mdix_ctrl = ETH_TP_MDI_AUTO; + phydev->mdix = ETH_TP_MDI; + phydev->pause = 0; + phydev->asym_pause = 0; + phydev->speed = SPEED_10; + phydev->duplex = DUPLEX_HALF; + + // bring up the link (link_ctrl is mapped to BMCR_ANENABLE) + // clear also ISOLATE mode and Collision Test + return phy_write(phydev, MII_BMCR, BMCR_ANENABLE); +} + +static int ncn26000_soft_reset(struct phy_device *phydev) +{ + int ret; + + ret = phy_set_bits(phydev, MII_BMCR, BMCR_RESET); + + if (ret != 0) + return ret; + + return phy_read_poll_timeout(phydev, + MII_BMCR, + ret, + !(ret & BMCR_RESET), + 500, + 20000, + true); +} + +static int ncn26000_get_features(struct phy_device *phydev) +{ + linkmode_zero(phydev->supported); + linkmode_set_bit(ETHTOOL_LINK_MODE_MII_BIT, phydev->supported); + + linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT1S_P2MP_Half_BIT, + phydev->supported); + + linkmode_copy(phydev->advertising, phydev->supported); + return 0; +} + +static irqreturn_t ncn26000_handle_interrupt(struct phy_device *phydev) +{ + const struct ncn26000_priv *const priv = phydev->priv; + u16 events; + int ret; + + // read and aknowledge the IRQ status register + ret = phy_read(phydev, NCN26000_REG_IRQ_STATUS); + + if (unlikely(ret < 0)) + return IRQ_NONE; + + events = (u16)ret & priv->enabled_irqs; + if (events == 0) + return IRQ_NONE; + + if (events & NCN26000_IRQ_LINKST_BIT) { + ret = phy_read(phydev, MII_BMSR); + + if (unlikely(ret < 0)) { + phydev_err(phydev, + "error reading the status register (%d)\n", + ret); + + return IRQ_NONE; + } + + phydev->link = ((u16)ret & BMSR_ANEGCOMPLETE) ? 1 : 0; + } + + // handle more IRQs here + + phy_trigger_machine(phydev); + return IRQ_HANDLED; +} + +static int ncn26000_config_intr(struct phy_device *phydev) +{ + int ret; + struct ncn26000_priv *priv = phydev->priv; + + if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { + // acknowledge IRQs + ret = phy_read(phydev, NCN26000_REG_IRQ_STATUS); + if (ret < 0) + return ret; + + // get link status notifications + priv->enabled_irqs = NCN26000_IRQ_LINKST_BIT; + } else { + // disable all IRQs + priv->enabled_irqs = 0; + } + + ret = phy_write(phydev, NCN26000_REG_IRQ_CTL, priv->enabled_irqs); + if (ret != 0) + return ret; + + return 0; +} + +static int ncn26000_probe(struct phy_device *phydev) +{ + struct device *dev = &phydev->mdio.dev; + struct ncn26000_priv *priv; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + phydev->priv = priv; + + return 0; +} + +static void ncn26000_remove(struct phy_device *phydev) +{ + struct device *dev = &phydev->mdio.dev; + struct ncn26000_priv *priv = phydev->priv; + + // free the private structure pointer + devm_kfree(dev, priv); +} + +static struct phy_driver ncn26000_driver[] = { + { + PHY_ID_MATCH_MODEL(PHY_ID_NCN26000), + .name = "NCN26000", + .probe = ncn26000_probe, + .remove = ncn26000_remove, + .get_features = ncn26000_get_features, + .config_init = ncn26000_config_init, + .soft_reset = ncn26000_soft_reset, + .config_intr = ncn26000_config_intr, + .config_aneg = ncn26000_enable, + .handle_interrupt = ncn26000_handle_interrupt, + }, +}; + +module_phy_driver(ncn26000_driver); + +static struct mdio_device_id __maybe_unused ncn26000_tbl[] = { + { PHY_ID_MATCH_MODEL(PHY_ID_NCN26000) }, + { } +}; + +MODULE_DEVICE_TABLE(mdio, ncn26000_tbl); +MODULE_AUTHOR("Piergiorgio Beruto"); +MODULE_DESCRIPTION("onsemi 10BASE-T1S PHY driver"); +MODULE_LICENSE("Dual BSD/GPL"); -- 2.35.1
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