Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 171 insertions, 0 deletions

diff --git a/drivers/net/phy/ncn26000.c b/drivers/net/phy/ncn26000.c
new file mode 100644
index 0000000000..5680584f65
--- /dev/null
+++ b/drivers/net/phy/ncn26000.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ *  Driver for the onsemi 10BASE-T1S NCN26000 PHYs family.
+ *
+ * Copyright 2022 onsemi
+ */
+#include <linux/kernel.h>
+#include <linux/bitfield.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+
+#include "mdio-open-alliance.h"
+
+#define PHY_ID_NCN26000			0x180FF5A1
+
+#define NCN26000_REG_IRQ_CTL            16
+#define NCN26000_REG_IRQ_STATUS         17
+
+// the NCN26000 maps link_ctrl to BMCR_ANENABLE
+#define NCN26000_BCMR_LINK_CTRL_BIT	BMCR_ANENABLE
+
+// the NCN26000 maps link_status to BMSR_ANEGCOMPLETE
+#define NCN26000_BMSR_LINK_STATUS_BIT	BMSR_ANEGCOMPLETE
+
+#define NCN26000_IRQ_LINKST_BIT		BIT(0)
+#define NCN26000_IRQ_PLCAST_BIT		BIT(1)
+#define NCN26000_IRQ_LJABBER_BIT	BIT(2)
+#define NCN26000_IRQ_RJABBER_BIT	BIT(3)
+#define NCN26000_IRQ_PLCAREC_BIT	BIT(4)
+#define NCN26000_IRQ_PHYSCOL_BIT	BIT(5)
+#define NCN26000_IRQ_RESET_BIT		BIT(15)
+
+#define TO_TMR_DEFAULT			32
+
+static int ncn26000_config_init(struct phy_device *phydev)
+{
+	/* HW bug workaround: the default value of the PLCA TO_TIMER should be
+	 * 32, where the current version of NCN26000 reports 24. This will be
+	 * fixed in future PHY versions. For the time being, we force the
+	 * correct default here.
+	 */
+	return phy_write_mmd(phydev, MDIO_MMD_VEND2, MDIO_OATC14_PLCA_TOTMR,
+			     TO_TMR_DEFAULT);
+}
+
+static int ncn26000_config_aneg(struct phy_device *phydev)
+{
+	/* Note: the NCN26000 supports only P2MP link mode. Therefore, AN is not
+	 * supported. However, this function is invoked by phylib to enable the
+	 * PHY, regardless of the AN support.
+	 */
+	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+	phydev->mdix = ETH_TP_MDI;
+
+	// bring up the link
+	return phy_write(phydev, MII_BMCR, NCN26000_BCMR_LINK_CTRL_BIT);
+}
+
+static int ncn26000_read_status(struct phy_device *phydev)
+{
+	/* The NCN26000 reports NCN26000_LINK_STATUS_BIT if the link status of
+	 * the PHY is up. It further reports the logical AND of the link status
+	 * and the PLCA status in the BMSR_LSTATUS bit.
+	 */
+	int ret;
+
+	/* The link state is latched low so that momentary link
+	 * drops can be detected. Do not double-read the status
+	 * in polling mode to detect such short link drops except
+	 * the link was already down.
+	 */
+	if (!phy_polling_mode(phydev) || !phydev->link) {
+		ret = phy_read(phydev, MII_BMSR);
+		if (ret < 0)
+			return ret;
+		else if (ret & NCN26000_BMSR_LINK_STATUS_BIT)
+			goto upd_link;
+	}
+
+	ret = phy_read(phydev, MII_BMSR);
+	if (ret < 0)
+		return ret;
+
+upd_link:
+	// update link status
+	if (ret & NCN26000_BMSR_LINK_STATUS_BIT) {
+		phydev->link = 1;
+		phydev->pause = 0;
+		phydev->duplex = DUPLEX_HALF;
+		phydev->speed = SPEED_10;
+	} else {
+		phydev->link = 0;
+		phydev->duplex = DUPLEX_UNKNOWN;
+		phydev->speed = SPEED_UNKNOWN;
+	}
+
+	return 0;
+}
+
+static irqreturn_t ncn26000_handle_interrupt(struct phy_device *phydev)
+{
+	int ret;
+
+	// read and aknowledge the IRQ status register
+	ret = phy_read(phydev, NCN26000_REG_IRQ_STATUS);
+
+	// check only link status changes
+	if (ret < 0 || (ret & NCN26000_REG_IRQ_STATUS) == 0)
+		return IRQ_NONE;
+
+	phy_trigger_machine(phydev);
+	return IRQ_HANDLED;
+}
+
+static int ncn26000_config_intr(struct phy_device *phydev)
+{
+	int ret;
+	u16 irqe;
+
+	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
+		irqe = NCN26000_IRQ_LINKST_BIT;
+	} else {
+		// disable all IRQs
+		irqe = 0;
+	}
+
+	ret = phy_write(phydev, NCN26000_REG_IRQ_CTL, irqe);
+	if (ret != 0)
+		return ret;
+
+	return 0;
+}
+
+static struct phy_driver ncn26000_driver[] = {
+	{
+		PHY_ID_MATCH_MODEL(PHY_ID_NCN26000),
+		.name			= "NCN26000",
+		.features		= PHY_BASIC_T1S_P2MP_FEATURES,
+		.config_init            = ncn26000_config_init,
+		.config_intr            = ncn26000_config_intr,
+		.config_aneg		= ncn26000_config_aneg,
+		.read_status		= ncn26000_read_status,
+		.handle_interrupt       = ncn26000_handle_interrupt,
+		.get_plca_cfg		= genphy_c45_plca_get_cfg,
+		.set_plca_cfg		= genphy_c45_plca_set_cfg,
+		.get_plca_status	= genphy_c45_plca_get_status,
+		.soft_reset             = genphy_soft_reset,
+	},
+};
+
+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");