// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
* Driver for Analog Devices Industrial Ethernet T1L PHYs
*
* Copyright 2020 Analog Devices Inc.
*/
#include <linux/kernel.h>
#include <linux/bitfield.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/property.h>
#define PHY_ID_ADIN1100 0x0283bc81
#define PHY_ID_ADIN1110 0x0283bc91
#define PHY_ID_ADIN2111 0x0283bca1
#define ADIN_PHY_SUBSYS_IRQ_MASK 0x0021
#define ADIN_LINK_STAT_CHNG_IRQ_EN BIT(1)
#define ADIN_PHY_SUBSYS_IRQ_STATUS 0x0011
#define ADIN_LINK_STAT_CHNG BIT(1)
#define ADIN_FORCED_MODE 0x8000
#define ADIN_FORCED_MODE_EN BIT(0)
#define ADIN_CRSM_SFT_RST 0x8810
#define ADIN_CRSM_SFT_RST_EN BIT(0)
#define ADIN_CRSM_SFT_PD_CNTRL 0x8812
#define ADIN_CRSM_SFT_PD_CNTRL_EN BIT(0)
#define ADIN_AN_PHY_INST_STATUS 0x8030
#define ADIN_IS_CFG_SLV BIT(2)
#define ADIN_IS_CFG_MST BIT(3)
#define ADIN_CRSM_STAT 0x8818
#define ADIN_CRSM_SFT_PD_RDY BIT(1)
#define ADIN_CRSM_SYS_RDY BIT(0)
#define ADIN_MSE_VAL 0x830B
#define ADIN_SQI_MAX 7
struct adin_mse_sqi_range {
u16 start;
u16 end;
};
static const struct adin_mse_sqi_range adin_mse_sqi_map[] = {
{ 0x0A74, 0xFFFF },
{ 0x084E, 0x0A74 },
{ 0x0698, 0x084E },
{ 0x053D, 0x0698 },
{ 0x0429, 0x053D },
{ 0x034E, 0x0429 },
{ 0x02A0, 0x034E },
{ 0x0000, 0x02A0 },
};
/**
* struct adin_priv - ADIN PHY driver private data
* @tx_level_2v4_able: set if the PHY supports 2.4V TX levels (10BASE-T1L)
* @tx_level_2v4: set if the PHY requests 2.4V TX levels (10BASE-T1L)
* @tx_level_prop_present: set if the TX level is specified in DT
*/
struct adin_priv {
unsigned int tx_level_2v4_able:1;
unsigned int tx_level_2v4:1;
unsigned int tx_level_prop_present:1;
};
static int adin_read_status(struct phy_device *phydev)
{
int ret;
ret = genphy_c45_read_status(phydev);
if (ret)
return ret;
ret = phy_read_mmd(phydev, MDIO_MMD_AN, ADIN_AN_PHY_INST_STATUS);
if (ret < 0)
return ret;
if (ret & ADIN_IS_CFG_SLV)
phydev->master_slave_state = MASTER_SLAVE_STATE_SLAVE;
if (ret & ADIN_IS_CFG_MST)
phydev->master_slave_state = MASTER_SLAVE_STATE_MASTER;
return 0;
}
static int adin_config_aneg(struct phy_device *phydev)
{
struct adin_priv *priv = phydev->priv;
int ret;
if (phydev->autoneg == AUTONEG_DISABLE) {
ret = genphy_c45_pma_setup_forced(phydev);
if (ret < 0)
return ret;
if (priv->tx_level_prop_present && priv->tx_level_2v4)
ret = phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_B10L_PMA_CTRL,
MDIO_PMA_10T1L_CTRL_2V4_EN);
else
ret = phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_B10L_PMA_CTRL,
MDIO_PMA_10T1L_CTRL_2V4_EN);
if (ret < 0)
return ret;
/* Force PHY to use above configurations */
return phy_set_bits_mmd(phydev, MDIO_MMD_AN, ADIN_FORCED_MODE, ADIN_FORCED_MODE_EN);
}
ret = phy_clear_bits_mmd(phydev, MDIO_MMD_AN, ADIN_FORCED_MODE, ADIN_FORCED_MODE_EN);
if (ret < 0)
return ret;
/* Request increased transmit level from LP. */
if (priv->tx_level_prop_present && priv->tx_level_2v4) {
ret = phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_T1_ADV_H,
MDIO_AN_T1_ADV_H_10L_TX_HI |
MDIO_AN_T1_ADV_H_10L_TX_HI_REQ);
if (ret < 0)
return ret;
}
/* Disable 2.4 Vpp transmit level. */
if ((priv->tx_level_prop_present && !priv->tx_level_2v4) || !priv->tx_level_2v4_able) {
ret = phy_clear_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_T1_ADV_H,
MDIO_AN_T1_ADV_H_10L_TX_HI |
MDIO_AN_T1_ADV_H_10L_TX_HI_REQ);
if (ret < 0)
return ret;
}
return genphy_c45_config_aneg(phydev);
}
static int adin_phy_ack_intr(struct phy_device *phydev)
{
/* Clear pending interrupts */
int rc = phy_read_mmd(phydev, MDIO_MMD_VEND2,
ADIN_PHY_SUBSYS_IRQ_STATUS);
return rc < 0 ? rc : 0;
}
static int adin_config_intr(struct phy_device *phydev)
{
u16 irq_mask;
int ret;
ret = adin_phy_ack_intr(phydev);
if (ret)
return ret;
if (phydev->interrupts == PHY_INTERRUPT_ENABLED)
irq_mask = ADIN_LINK_STAT_CHNG_IRQ_EN;
else
irq_mask = 0;
return phy_modify_mmd(phydev, MDIO_MMD_VEND2,
ADIN_PHY_SUBSYS_IRQ_MASK,
ADIN_LINK_STAT_CHNG_IRQ_EN, irq_mask);
}
static irqreturn_t adin_phy_handle_interrupt(struct phy_device *phydev)
{
int irq_status;
irq_status = phy_read_mmd(phydev, MDIO_MMD_VEND2,
ADIN_PHY_SUBSYS_IRQ_STATUS);
if (irq_status < 0) {
phy_error(phydev);
return IRQ_NONE;
}
if (!(irq_status & ADIN_LINK_STAT_CHNG))
return IRQ_NONE;
phy_trigger_machine(phydev);
return IRQ_HANDLED;
}
static int adin_set_powerdown_mode(struct phy_device *phydev, bool en)
{
int ret;
int val;
val = en ? ADIN_CRSM_SFT_PD_CNTRL_EN : 0;
ret = phy_write_mmd(phydev, MDIO_MMD_VEND1,
ADIN_CRSM_SFT_PD_CNTRL, val);
if (ret < 0)
return ret;
return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1, ADIN_CRSM_STAT, ret,
(ret & ADIN_CRSM_SFT_PD_RDY) == val,
1000, 30000, true);
}
static int adin_suspend(struct phy_device *phydev)
{
return adin_set_powerdown_mode(phydev, true);
}
static int adin_resume(struct phy_device *phydev)
{
return adin_set_powerdown_mode(phydev, false);
}
static int adin_set_loopback(struct phy_device *phydev, bool enable)
{
if (enable)
return phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_10T1L_CTRL,
BMCR_LOOPBACK);
/* PCS loopback (according to 10BASE-T1L spec) */
return phy_clear_bits_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_10T1L_CTRL,
BMCR_LOOPBACK);
}
static int adin_soft_reset(struct phy_device *phydev)
{
int ret;
ret = phy_set_bits_mmd(phydev, MDIO_MMD_VEND1, ADIN_CRSM_SFT_RST, ADIN_CRSM_SFT_RST_EN);
if (ret < 0)
return ret;
return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1, ADIN_CRSM_STAT, ret,
(ret & ADIN_CRSM_SYS_RDY),
10000, 30000, true);
}
static int adin_get_features(struct phy_device *phydev)
{
struct adin_priv *priv = phydev->priv;
struct device *dev = &phydev->mdio.dev;
int ret;
u8 val;
ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_10T1L_STAT);
if (ret < 0)
return ret;
/* This depends on the voltage level from the power source */
priv->tx_level_2v4_able = !!(ret & MDIO_PMA_10T1L_STAT_2V4_ABLE);
phydev_dbg(phydev, "PHY supports 2.4V TX level: %s\n",
priv->tx_level_2v4_able ? "yes" : "no");
priv->tx_level_prop_present = device_property_present(dev, "phy-10base-t1l-2.4vpp");
if (priv->tx_level_prop_present) {
ret = device_property_read_u8(dev, "phy-10base-t1l-2.4vpp", &val);
if (ret < 0)
return ret;
priv->tx_level_2v4 = val;
if (!priv->tx_level_2v4 && priv->tx_level_2v4_able)
phydev_info(phydev,
"PHY supports 2.4V TX level, but disabled via config\n");
}
linkmode_set_bit_array(phy_basic_ports_array, ARRAY_SIZE(phy_basic_ports_array),
phydev->supported);
return genphy_c45_pma_read_abilities(phydev);
}
static int adin_get_sqi(struct phy_device *phydev)
{
u16 mse_val;
int sqi;
int ret;
ret = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT1);
if (ret < 0)
return ret;
else if (!(ret & MDIO_STAT1_LSTATUS))
return 0;
ret = phy_read_mmd(phydev, MDIO_STAT1, ADIN_MSE_VAL);
if (ret < 0)
return ret;
mse_val = 0xFFFF & ret;
for (sqi = 0; sqi < ARRAY_SIZE(adin_mse_sqi_map); sqi++) {
if (mse_val >= adin_mse_sqi_map[sqi].start && mse_val <= adin_mse_sqi_map[sqi].end)
return sqi;
}
return -EINVAL;
}
static int adin_get_sqi_max(struct phy_device *phydev)
{
return ADIN_SQI_MAX;
}
static int adin_probe(struct phy_device *phydev)
{
struct device *dev = &phydev->mdio.dev;
struct adin_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
phydev->priv = priv;
return 0;
}
static struct phy_driver adin_driver[] = {
{
.phy_id = PHY_ID_ADIN1100,
.phy_id_mask = 0xffffffcf,
.name = "ADIN1100",
.get_features = adin_get_features,
.soft_reset = adin_soft_reset,
.probe = adin_probe,
.config_aneg = adin_config_aneg,
.read_status = adin_read_status,
.config_intr = adin_config_intr,
.handle_interrupt = adin_phy_handle_interrupt,
.set_loopback = adin_set_loopback,
.suspend = adin_suspend,
.resume = adin_resume,
.get_sqi = adin_get_sqi,
.get_sqi_max = adin_get_sqi_max,
},
};
module_phy_driver(adin_driver);
static struct mdio_device_id __maybe_unused adin_tbl[] = {
{ PHY_ID_MATCH_MODEL(PHY_ID_ADIN1100) },
{ PHY_ID_MATCH_MODEL(PHY_ID_ADIN1110) },
{ PHY_ID_MATCH_MODEL(PHY_ID_ADIN2111) },
{ }
};
MODULE_DEVICE_TABLE(mdio, adin_tbl);
MODULE_DESCRIPTION("Analog Devices Industrial Ethernet T1L PHY driver");
MODULE_LICENSE("Dual BSD/GPL");
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