u-boot/drivers/net/phy/nxp-c45-tja11xx.c

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// 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;
}