--- /dev/null
+// 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;
+}
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