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Message-ID: <834be48779804c338f00f03002f31658d942546b.1670119328.git.piergiorgio.beruto@gmail.com>
Date: Sun, 4 Dec 2022 03:31:33 +0100
From: Piergiorgio Beruto <piergiorgio.beruto@...il.com>
To: Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
Oleksij Rempel <o.rempel@...gutronix.de>
Subject: [PATCH net-next 3/4] drivers/net/phy: Add driver for the onsemi
NCN26000 10BASE-T1S PHY
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@...il.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@...r.kernel.org
S: Maintained
F: arch/mips/boot/dts/ralink/omega2p.dts
+ONSEMI ETHERNET PHY DRIVERS
+M: Piergiorgio Beruto <piergiorgio.beruto@...il.com>
+L: netdev@...r.kernel.org
+S: Supported
+W: http://www.onsemi.com
+F: drivers/net/phy/ncn*
+
OP-TEE DRIVER
M: Jens Wiklander <jens.wiklander@...aro.org>
L: op-tee@...ts.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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