phy: add nxp tja1103 phy driver

Add nxp tja1103 phy driver.

Signed-off-by: Radu Pirea (NXP OSS) <radu-nicolae.pirea@oss.nxp.com>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>

4 files changed, 358 insertions, 0 deletions

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 070ffa82cb..405bf76753 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -197,6 +197,12 @@ config PHY_MSCC
 config PHY_NATSEMI
 	bool "National Semiconductor Ethernet PHYs support"
 
+config PHY_NXP_C45_TJA11XX
+	tristate "NXP C45 TJA11XX PHYs"
+	help
+	  Enable support for NXP C45 TJA11XX PHYs.
+	  Currently supports only the TJA1103 PHY.
+
 config PHY_REALTEK
 	bool "Realtek Ethernet PHYs support"
 
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index e967f82201..218b8c7669 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_PHY_MICREL_KSZ8XXX) += micrel_ksz8xxx.o
 obj-$(CONFIG_PHY_MICREL_KSZ90X1) += micrel_ksz90x1.o
 obj-$(CONFIG_PHY_MESON_GXL) += meson-gxl.o
 obj-$(CONFIG_PHY_NATSEMI) += natsemi.o
+obj-$(CONFIG_PHY_NXP_C45_TJA11XX) += nxp-c45-tja11xx.o
 obj-$(CONFIG_PHY_REALTEK) += realtek.o
 obj-$(CONFIG_PHY_SMSC) += smsc.o
 obj-$(CONFIG_PHY_TERANETICS) += teranetics.o
diff --git a/drivers/net/phy/nxp-c45-tja11xx.c b/drivers/net/phy/nxp-c45-tja11xx.c
new file mode 100644
index 0000000000..f86e31f0d9
--- /dev/null
+++ b/drivers/net/phy/nxp-c45-tja11xx.c
@@ -0,0 +1,348 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * NXP C45 PHY driver
+ *
+ * Copyright 2021 NXP
+ * Author: Radu Pirea <radu-nicolae.pirea@oss.nxp.com>
+ */
+#include <common.h>
+#include <dm.h>
+#include <dm/devres.h>
+#include <linux/delay.h>
+#include <linux/math64.h>
+#include <linux/mdio.h>
+#include <phy.h>
+
+#define PHY_ID_TJA_1103			0x001BB010
+
+#define VEND1_DEVICE_CONTROL		0x0040
+#define DEVICE_CONTROL_RESET		BIT(15)
+#define DEVICE_CONTROL_CONFIG_GLOBAL_EN	BIT(14)
+#define DEVICE_CONTROL_CONFIG_ALL_EN	BIT(13)
+
+#define VEND1_PORT_CONTROL		0x8040
+#define PORT_CONTROL_EN			BIT(14)
+
+#define VEND1_PHY_CONTROL		0x8100
+#define PHY_CONFIG_EN			BIT(14)
+#define PHY_START_OP			BIT(0)
+
+#define VEND1_PHY_CONFIG		0x8108
+#define PHY_CONFIG_AUTO			BIT(0)
+
+#define VEND1_PORT_INFRA_CONTROL	0xAC00
+#define PORT_INFRA_CONTROL_EN		BIT(14)
+
+#define VEND1_RXID			0xAFCC
+#define VEND1_TXID			0xAFCD
+#define ID_ENABLE			BIT(15)
+
+#define VEND1_ABILITIES			0xAFC4
+#define RGMII_ID_ABILITY		BIT(15)
+#define RGMII_ABILITY			BIT(14)
+#define RMII_ABILITY			BIT(10)
+#define REVMII_ABILITY			BIT(9)
+#define MII_ABILITY			BIT(8)
+#define SGMII_ABILITY			BIT(0)
+
+#define VEND1_MII_BASIC_CONFIG		0xAFC6
+#define MII_BASIC_CONFIG_REV		BIT(8)
+#define MII_BASIC_CONFIG_SGMII		0x9
+#define MII_BASIC_CONFIG_RGMII		0x7
+#define MII_BASIC_CONFIG_RMII		0x5
+#define MII_BASIC_CONFIG_MII		0x4
+
+#define RGMII_PERIOD_PS			8000U
+#define PS_PER_DEGREE			div_u64(RGMII_PERIOD_PS, 360)
+#define MIN_ID_PS			1644U
+#define MAX_ID_PS			2260U
+#define DEFAULT_ID_PS			2000U
+
+#define RESET_DELAY_MS			25
+#define CONF_EN_DELAY_US		450
+
+struct nxp_c45_phy {
+	u32 tx_delay;
+	u32 rx_delay;
+};
+
+static int nxp_c45_soft_reset(struct phy_device *phydev)
+{
+	int tries = 10, ret;
+
+	ret = phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_DEVICE_CONTROL,
+			    DEVICE_CONTROL_RESET);
+	if (ret)
+		return ret;
+
+	do {
+		ret = phy_read_mmd(phydev, MDIO_MMD_VEND1,
+				   VEND1_DEVICE_CONTROL);
+		if (!(ret & DEVICE_CONTROL_RESET))
+			return 0;
+		mdelay(RESET_DELAY_MS);
+	} while (tries--);
+
+	return -EIO;
+}
+
+static int nxp_c45_start_op(struct phy_device *phydev)
+{
+	return phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_PHY_CONTROL,
+			     PHY_START_OP);
+}
+
+static int nxp_c45_config_enable(struct phy_device *phydev)
+{
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_DEVICE_CONTROL,
+		      DEVICE_CONTROL_CONFIG_GLOBAL_EN |
+		      DEVICE_CONTROL_CONFIG_ALL_EN);
+	udelay(CONF_EN_DELAY_US);
+
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_PORT_CONTROL,
+		      PORT_CONTROL_EN);
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_PHY_CONTROL,
+		      PHY_CONFIG_EN);
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_PORT_INFRA_CONTROL,
+		      PORT_INFRA_CONTROL_EN);
+
+	return 0;
+}
+
+static u64 nxp_c45_get_phase_shift(u64 phase_offset_raw)
+{
+	/* The delay in degree phase is 73.8 + phase_offset_raw * 0.9.
+	 * To avoid floating point operations we'll multiply by 10
+	 * and get 1 decimal point precision.
+	 */
+	phase_offset_raw *= 10;
+	phase_offset_raw -= 738;
+	return div_u64(phase_offset_raw, 9);
+}
+
+static void nxp_c45_disable_delays(struct phy_device *phydev)
+{
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_TXID, 0);
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_RXID, 0);
+}
+
+static int nxp_c45_check_delay(struct phy_device *phydev, u32 delay)
+{
+	if (delay < MIN_ID_PS) {
+		pr_err("%s: delay value smaller than %u\n",
+		       phydev->drv->name, MIN_ID_PS);
+		return -EINVAL;
+	}
+
+	if (delay > MAX_ID_PS) {
+		pr_err("%s: delay value higher than %u\n",
+		       phydev->drv->name, MAX_ID_PS);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int nxp_c45_get_delays(struct phy_device *phydev)
+{
+	struct nxp_c45_phy *priv = phydev->priv;
+	int ret;
+
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+	    phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
+		ret = dev_read_u32(phydev->dev, "tx-internal-delay-ps",
+				   &priv->tx_delay);
+		if (ret)
+			priv->tx_delay = DEFAULT_ID_PS;
+
+		ret = nxp_c45_check_delay(phydev, priv->tx_delay);
+		if (ret) {
+			pr_err("%s: tx-internal-delay-ps invalid value\n",
+			       phydev->drv->name);
+			return ret;
+		}
+	}
+
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+	    phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
+		ret = dev_read_u32(phydev->dev, "rx-internal-delay-ps",
+				   &priv->rx_delay);
+		if (ret)
+			priv->rx_delay = DEFAULT_ID_PS;
+
+		ret = nxp_c45_check_delay(phydev, priv->rx_delay);
+		if (ret) {
+			pr_err("%s: rx-internal-delay-ps invalid value\n",
+			       phydev->drv->name);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static void nxp_c45_set_delays(struct phy_device *phydev)
+{
+	struct nxp_c45_phy *priv = phydev->priv;
+	u64 tx_delay = priv->tx_delay;
+	u64 rx_delay = priv->rx_delay;
+	u64 degree;
+
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+	    phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID) {
+		degree = div_u64(tx_delay, PS_PER_DEGREE);
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_TXID,
+			      ID_ENABLE | nxp_c45_get_phase_shift(degree));
+	} else {
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_TXID, 0);
+	}
+
+	if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
+	    phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
+		degree = div_u64(rx_delay, PS_PER_DEGREE);
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_RXID,
+			      ID_ENABLE | nxp_c45_get_phase_shift(degree));
+	} else {
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_RXID, 0);
+	}
+}
+
+static int nxp_c45_set_phy_mode(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_ABILITIES);
+	pr_debug("%s: Clause 45 managed PHY abilities 0x%x\n",
+		 phydev->drv->name, ret);
+
+	switch (phydev->interface) {
+	case PHY_INTERFACE_MODE_RGMII:
+		if (!(ret & RGMII_ABILITY)) {
+			pr_err("%s: rgmii mode not supported\n",
+			       phydev->drv->name);
+			return -EINVAL;
+		}
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_MII_BASIC_CONFIG,
+			      MII_BASIC_CONFIG_RGMII);
+		nxp_c45_disable_delays(phydev);
+		break;
+	case PHY_INTERFACE_MODE_RGMII_ID:
+	case PHY_INTERFACE_MODE_RGMII_TXID:
+	case PHY_INTERFACE_MODE_RGMII_RXID:
+		if (!(ret & RGMII_ID_ABILITY)) {
+			pr_err("%s: rgmii-id, rgmii-txid, rgmii-rxid modes are not supported\n",
+			       phydev->drv->name);
+			return -EINVAL;
+		}
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_MII_BASIC_CONFIG,
+			      MII_BASIC_CONFIG_RGMII);
+		ret = nxp_c45_get_delays(phydev);
+		if (ret)
+			return ret;
+
+		nxp_c45_set_delays(phydev);
+		break;
+	case PHY_INTERFACE_MODE_MII:
+		if (!(ret & MII_ABILITY)) {
+			pr_err("%s: mii mode not supported\n",
+			       phydev->drv->name);
+			return -EINVAL;
+		}
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_MII_BASIC_CONFIG,
+			      MII_BASIC_CONFIG_MII);
+		break;
+	case PHY_INTERFACE_MODE_RMII:
+		if (!(ret & RMII_ABILITY)) {
+			pr_err("%s: rmii mode not supported\n",
+			       phydev->drv->name);
+			return -EINVAL;
+		}
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_MII_BASIC_CONFIG,
+			      MII_BASIC_CONFIG_RMII);
+		break;
+	case PHY_INTERFACE_MODE_SGMII:
+		if (!(ret & SGMII_ABILITY)) {
+			pr_err("%s: sgmii mode not supported\n",
+			       phydev->drv->name);
+			return -EINVAL;
+		}
+		phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_MII_BASIC_CONFIG,
+			      MII_BASIC_CONFIG_SGMII);
+		break;
+	case PHY_INTERFACE_MODE_INTERNAL:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int nxp_c45_config(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = nxp_c45_soft_reset(phydev);
+	if (ret)
+		return ret;
+
+	ret = nxp_c45_config_enable(phydev);
+	if (ret) {
+		pr_err("%s: Failed to enable config\n", phydev->drv->name);
+		return ret;
+	}
+
+	phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_PHY_CONFIG,
+		      PHY_CONFIG_AUTO);
+
+	ret = nxp_c45_set_phy_mode(phydev);
+	if (ret) {
+		pr_err("%s: Failed to set phy mode\n", phydev->drv->name);
+		return ret;
+	}
+
+	phydev->autoneg = AUTONEG_DISABLE;
+
+	return nxp_c45_start_op(phydev);
+}
+
+static int nxp_c45_startup(struct phy_device *phydev)
+{
+	u32 reg;
+
+	reg = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT1);
+	phydev->link = !!(reg & MDIO_STAT1_LSTATUS);
+	phydev->speed = SPEED_100;
+	phydev->duplex = DUPLEX_FULL;
+	return 0;
+}
+
+static int nxp_c45_probe(struct phy_device *phydev)
+{
+	struct nxp_c45_phy *priv;
+
+	priv = devm_kzalloc(phydev->priv, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	phydev->priv = priv;
+
+	return 0;
+}
+
+static struct phy_driver nxp_tja11xx = {
+	.name = "NXP C45 TJA1103",
+	.uid  = PHY_ID_TJA_1103,
+	.mask = 0xfffff0,
+	.features = PHY_100BT1_FEATURES,
+	.probe = &nxp_c45_probe,
+	.config = &nxp_c45_config,
+	.startup = &nxp_c45_startup,
+	.shutdown = &genphy_shutdown,
+};
+
+int phy_nxp_tja11xx_init(void)
+{
+	phy_register(&nxp_tja11xx);
+	return 0;
+}
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index ed197fa46d..69acb69460 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -529,6 +529,9 @@ int phy_init(void)
 #ifdef CONFIG_PHY_NATSEMI
 	phy_natsemi_init();
 #endif
+#ifdef CONFIG_NXP_C45_TJA11XX_PHY
+	phy_nxp_tja11xx_init();
+#endif
 #ifdef CONFIG_PHY_REALTEK
 	phy_realtek_init();
 #endif