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|
// SPDX-License-Identifier: GPL-2.0
/* NXP C45 PHY driver
* Copyright (C) 2021 NXP
* Author: Radu Pirea <radu-nicolae.pirea@oss.nxp.com>
*/
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/ethtool_netlink.h>
#include <linux/kernel.h>
#include <linux/mii.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/processor.h>
#include <linux/property.h>
#define PHY_ID_TJA_1103 0x001BB010
#define PMAPMD_B100T1_PMAPMD_CTL 0x0834
#define B100T1_PMAPMD_CONFIG_EN BIT(15)
#define B100T1_PMAPMD_MASTER BIT(14)
#define MASTER_MODE (B100T1_PMAPMD_CONFIG_EN | \
B100T1_PMAPMD_MASTER)
#define SLAVE_MODE (B100T1_PMAPMD_CONFIG_EN)
#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_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_SIGNAL_QUALITY 0x8320
#define SQI_VALID BIT(14)
#define SQI_MASK GENMASK(2, 0)
#define MAX_SQI SQI_MASK
#define VEND1_CABLE_TEST 0x8330
#define CABLE_TEST_ENABLE BIT(15)
#define CABLE_TEST_START BIT(14)
#define CABLE_TEST_VALID BIT(13)
#define CABLE_TEST_OK 0x00
#define CABLE_TEST_SHORTED 0x01
#define CABLE_TEST_OPEN 0x02
#define CABLE_TEST_UNKNOWN 0x07
#define VEND1_PORT_CONTROL 0x8040
#define PORT_CONTROL_EN BIT(14)
#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 VEND1_SYMBOL_ERROR_COUNTER 0x8350
#define VEND1_LINK_DROP_COUNTER 0x8352
#define VEND1_LINK_LOSSES_AND_FAILURES 0x8353
#define VEND1_R_GOOD_FRAME_CNT 0xA950
#define VEND1_R_BAD_FRAME_CNT 0xA952
#define VEND1_R_RXER_FRAME_CNT 0xA954
#define VEND1_RX_PREAMBLE_COUNT 0xAFCE
#define VEND1_TX_PREAMBLE_COUNT 0xAFCF
#define VEND1_RX_IPG_LENGTH 0xAFD0
#define VEND1_TX_IPG_LENGTH 0xAFD1
#define COUNTER_EN BIT(15)
#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
struct nxp_c45_phy {
u32 tx_delay;
u32 rx_delay;
};
struct nxp_c45_phy_stats {
const char *name;
u8 mmd;
u16 reg;
u8 off;
u16 mask;
};
static const struct nxp_c45_phy_stats nxp_c45_hw_stats[] = {
{ "phy_symbol_error_cnt", MDIO_MMD_VEND1,
VEND1_SYMBOL_ERROR_COUNTER, 0, GENMASK(15, 0) },
{ "phy_link_status_drop_cnt", MDIO_MMD_VEND1,
VEND1_LINK_DROP_COUNTER, 8, GENMASK(13, 8) },
{ "phy_link_availability_drop_cnt", MDIO_MMD_VEND1,
VEND1_LINK_DROP_COUNTER, 0, GENMASK(5, 0) },
{ "phy_link_loss_cnt", MDIO_MMD_VEND1,
VEND1_LINK_LOSSES_AND_FAILURES, 10, GENMASK(15, 10) },
{ "phy_link_failure_cnt", MDIO_MMD_VEND1,
VEND1_LINK_LOSSES_AND_FAILURES, 0, GENMASK(9, 0) },
{ "r_good_frame_cnt", MDIO_MMD_VEND1,
VEND1_R_GOOD_FRAME_CNT, 0, GENMASK(15, 0) },
{ "r_bad_frame_cnt", MDIO_MMD_VEND1,
VEND1_R_BAD_FRAME_CNT, 0, GENMASK(15, 0) },
{ "r_rxer_frame_cnt", MDIO_MMD_VEND1,
VEND1_R_RXER_FRAME_CNT, 0, GENMASK(15, 0) },
{ "rx_preamble_count", MDIO_MMD_VEND1,
VEND1_RX_PREAMBLE_COUNT, 0, GENMASK(5, 0) },
{ "tx_preamble_count", MDIO_MMD_VEND1,
VEND1_TX_PREAMBLE_COUNT, 0, GENMASK(5, 0) },
{ "rx_ipg_length", MDIO_MMD_VEND1,
VEND1_RX_IPG_LENGTH, 0, GENMASK(8, 0) },
{ "tx_ipg_length", MDIO_MMD_VEND1,
VEND1_TX_IPG_LENGTH, 0, GENMASK(8, 0) },
};
static int nxp_c45_get_sset_count(struct phy_device *phydev)
{
return ARRAY_SIZE(nxp_c45_hw_stats);
}
static void nxp_c45_get_strings(struct phy_device *phydev, u8 *data)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(nxp_c45_hw_stats); i++) {
strncpy(data + i * ETH_GSTRING_LEN,
nxp_c45_hw_stats[i].name, ETH_GSTRING_LEN);
}
}
static void nxp_c45_get_stats(struct phy_device *phydev,
struct ethtool_stats *stats, u64 *data)
{
size_t i;
int ret;
for (i = 0; i < ARRAY_SIZE(nxp_c45_hw_stats); i++) {
ret = phy_read_mmd(phydev, nxp_c45_hw_stats[i].mmd,
nxp_c45_hw_stats[i].reg);
if (ret < 0) {
data[i] = U64_MAX;
} else {
data[i] = ret & nxp_c45_hw_stats[i].mask;
data[i] >>= nxp_c45_hw_stats[i].off;
}
}
}
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);
usleep_range(400, 450);
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 int nxp_c45_start_op(struct phy_device *phydev)
{
return phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_PHY_CONTROL,
PHY_START_OP);
}
static int nxp_c45_soft_reset(struct phy_device *phydev)
{
int ret;
ret = phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_DEVICE_CONTROL,
DEVICE_CONTROL_RESET);
if (ret)
return ret;
return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1,
VEND1_DEVICE_CONTROL, ret,
!(ret & DEVICE_CONTROL_RESET), 20000,
240000, false);
}
static int nxp_c45_cable_test_start(struct phy_device *phydev)
{
return phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_CABLE_TEST,
CABLE_TEST_ENABLE | CABLE_TEST_START);
}
static int nxp_c45_cable_test_get_status(struct phy_device *phydev,
bool *finished)
{
int ret;
u8 cable_test_result;
ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_CABLE_TEST);
if (!(ret & CABLE_TEST_VALID)) {
*finished = false;
return 0;
}
*finished = true;
cable_test_result = ret & GENMASK(2, 0);
switch (cable_test_result) {
case CABLE_TEST_OK:
ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_A,
ETHTOOL_A_CABLE_RESULT_CODE_OK);
break;
case CABLE_TEST_SHORTED:
ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_A,
ETHTOOL_A_CABLE_RESULT_CODE_SAME_SHORT);
break;
case CABLE_TEST_OPEN:
ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_A,
ETHTOOL_A_CABLE_RESULT_CODE_OPEN);
break;
default:
ethnl_cable_test_result(phydev, ETHTOOL_A_CABLE_PAIR_A,
ETHTOOL_A_CABLE_RESULT_CODE_UNSPEC);
}
phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_CABLE_TEST,
CABLE_TEST_ENABLE);
return nxp_c45_start_op(phydev);
}
static int nxp_c45_setup_master_slave(struct phy_device *phydev)
{
switch (phydev->master_slave_set) {
case MASTER_SLAVE_CFG_MASTER_FORCE:
case MASTER_SLAVE_CFG_MASTER_PREFERRED:
phy_write_mmd(phydev, MDIO_MMD_PMAPMD, PMAPMD_B100T1_PMAPMD_CTL,
MASTER_MODE);
break;
case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
case MASTER_SLAVE_CFG_SLAVE_FORCE:
phy_write_mmd(phydev, MDIO_MMD_PMAPMD, PMAPMD_B100T1_PMAPMD_CTL,
SLAVE_MODE);
break;
case MASTER_SLAVE_CFG_UNKNOWN:
case MASTER_SLAVE_CFG_UNSUPPORTED:
return 0;
default:
phydev_warn(phydev, "Unsupported Master/Slave mode\n");
return -EOPNOTSUPP;
}
return 0;
}
static int nxp_c45_read_master_slave(struct phy_device *phydev)
{
int reg;
phydev->master_slave_get = MASTER_SLAVE_CFG_UNKNOWN;
phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN;
reg = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, PMAPMD_B100T1_PMAPMD_CTL);
if (reg < 0)
return reg;
if (reg & B100T1_PMAPMD_MASTER) {
phydev->master_slave_get = MASTER_SLAVE_CFG_MASTER_FORCE;
phydev->master_slave_state = MASTER_SLAVE_STATE_MASTER;
} else {
phydev->master_slave_get = MASTER_SLAVE_CFG_SLAVE_FORCE;
phydev->master_slave_state = MASTER_SLAVE_STATE_SLAVE;
}
return 0;
}
static int nxp_c45_config_aneg(struct phy_device *phydev)
{
return nxp_c45_setup_master_slave(phydev);
}
static int nxp_c45_read_status(struct phy_device *phydev)
{
int ret;
ret = genphy_c45_read_status(phydev);
if (ret)
return ret;
ret = nxp_c45_read_master_slave(phydev);
if (ret)
return ret;
return 0;
}
static int nxp_c45_get_sqi(struct phy_device *phydev)
{
int reg;
reg = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_SIGNAL_QUALITY);
if (!(reg & SQI_VALID))
return -EINVAL;
reg &= SQI_MASK;
return reg;
}
static int nxp_c45_get_sqi_max(struct phy_device *phydev)
{
return MAX_SQI;
}
static int nxp_c45_check_delay(struct phy_device *phydev, u32 delay)
{
if (delay < MIN_ID_PS) {
phydev_err(phydev, "delay value smaller than %u\n", MIN_ID_PS);
return -EINVAL;
}
if (delay > MAX_ID_PS) {
phydev_err(phydev, "delay value higher than %u\n", MAX_ID_PS);
return -EINVAL;
}
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_clear_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_TXID, ID_ENABLE);
phy_clear_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_RXID, ID_ENABLE);
}
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_clear_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_TXID,
ID_ENABLE);
}
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_clear_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_RXID,
ID_ENABLE);
}
}
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 = device_property_read_u32(&phydev->mdio.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) {
phydev_err(phydev,
"tx-internal-delay-ps invalid value\n");
return ret;
}
}
if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID ||
phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID) {
ret = device_property_read_u32(&phydev->mdio.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) {
phydev_err(phydev,
"rx-internal-delay-ps invalid value\n");
return ret;
}
}
return 0;
}
static int nxp_c45_set_phy_mode(struct phy_device *phydev)
{
int ret;
ret = phy_read_mmd(phydev, MDIO_MMD_VEND1, VEND1_ABILITIES);
phydev_dbg(phydev, "Clause 45 managed PHY abilities 0x%x\n", ret);
switch (phydev->interface) {
case PHY_INTERFACE_MODE_RGMII:
if (!(ret & RGMII_ABILITY)) {
phydev_err(phydev, "rgmii mode not supported\n");
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)) {
phydev_err(phydev, "rgmii-id, rgmii-txid, rgmii-rxid modes are not supported\n");
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)) {
phydev_err(phydev, "mii mode not supported\n");
return -EINVAL;
}
phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_MII_BASIC_CONFIG,
MII_BASIC_CONFIG_MII);
break;
case PHY_INTERFACE_MODE_REVMII:
if (!(ret & REVMII_ABILITY)) {
phydev_err(phydev, "rev-mii mode not supported\n");
return -EINVAL;
}
phy_write_mmd(phydev, MDIO_MMD_VEND1, VEND1_MII_BASIC_CONFIG,
MII_BASIC_CONFIG_MII | MII_BASIC_CONFIG_REV);
break;
case PHY_INTERFACE_MODE_RMII:
if (!(ret & RMII_ABILITY)) {
phydev_err(phydev, "rmii mode not supported\n");
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)) {
phydev_err(phydev, "sgmii mode not supported\n");
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_init(struct phy_device *phydev)
{
int ret;
ret = nxp_c45_config_enable(phydev);
if (ret) {
phydev_err(phydev, "Failed to enable config\n");
return ret;
}
phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_PHY_CONFIG,
PHY_CONFIG_AUTO);
phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_LINK_DROP_COUNTER,
COUNTER_EN);
phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_RX_PREAMBLE_COUNT,
COUNTER_EN);
phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_TX_PREAMBLE_COUNT,
COUNTER_EN);
phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_RX_IPG_LENGTH,
COUNTER_EN);
phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, VEND1_TX_IPG_LENGTH,
COUNTER_EN);
ret = nxp_c45_set_phy_mode(phydev);
if (ret)
return ret;
phydev->autoneg = AUTONEG_DISABLE;
return nxp_c45_start_op(phydev);
}
static int nxp_c45_probe(struct phy_device *phydev)
{
struct nxp_c45_phy *priv;
priv = devm_kzalloc(&phydev->mdio.dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
phydev->priv = priv;
return 0;
}
static struct phy_driver nxp_c45_driver[] = {
{
PHY_ID_MATCH_MODEL(PHY_ID_TJA_1103),
.name = "NXP C45 TJA1103",
.features = PHY_BASIC_T1_FEATURES,
.probe = nxp_c45_probe,
.soft_reset = nxp_c45_soft_reset,
.config_aneg = nxp_c45_config_aneg,
.config_init = nxp_c45_config_init,
.read_status = nxp_c45_read_status,
.suspend = genphy_c45_pma_suspend,
.resume = genphy_c45_pma_resume,
.get_sset_count = nxp_c45_get_sset_count,
.get_strings = nxp_c45_get_strings,
.get_stats = nxp_c45_get_stats,
.cable_test_start = nxp_c45_cable_test_start,
.cable_test_get_status = nxp_c45_cable_test_get_status,
.set_loopback = genphy_c45_loopback,
.get_sqi = nxp_c45_get_sqi,
.get_sqi_max = nxp_c45_get_sqi_max,
},
};
module_phy_driver(nxp_c45_driver);
static struct mdio_device_id __maybe_unused nxp_c45_tbl[] = {
{ PHY_ID_MATCH_MODEL(PHY_ID_TJA_1103) },
{ /*sentinel*/ },
};
MODULE_DEVICE_TABLE(mdio, nxp_c45_tbl);
MODULE_AUTHOR("Radu Pirea <radu-nicolae.pirea@oss.nxp.com>");
MODULE_DESCRIPTION("NXP C45 PHY driver");
MODULE_LICENSE("GPL v2");
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