path: root/drivers/net/phy/phy-c45.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Clause 45 PHY support
 */
#include <linux/ethtool.h>
#include <linux/export.h>
#include <linux/mdio.h>
#include <linux/mii.h>
#include <linux/phy.h>

#include "mdio-open-alliance.h"
#include "phylib-internal.h"

/**
 * genphy_c45_baset1_able - checks if the PMA has BASE-T1 extended abilities
 * @phydev: target phy_device struct
 */
static bool genphy_c45_baset1_able(struct phy_device *phydev)
{
	int val;

	if (phydev->pma_extable == -ENODATA) {
		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_EXTABLE);
		if (val < 0)
			return false;

		phydev->pma_extable = val;
	}

	return !!(phydev->pma_extable & MDIO_PMA_EXTABLE_BT1);
}

/**
 * genphy_c45_pma_can_sleep - checks if the PMA have sleep support
 * @phydev: target phy_device struct
 */
static bool genphy_c45_pma_can_sleep(struct phy_device *phydev)
{
	int stat1;

	stat1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT1);
	if (stat1 < 0)
		return false;

	return !!(stat1 & MDIO_STAT1_LPOWERABLE);
}

/**
 * genphy_c45_pma_resume - wakes up the PMA module
 * @phydev: target phy_device struct
 */
int genphy_c45_pma_resume(struct phy_device *phydev)
{
	if (!genphy_c45_pma_can_sleep(phydev))
		return -EOPNOTSUPP;

	return phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
				  MDIO_CTRL1_LPOWER);
}
EXPORT_SYMBOL_GPL(genphy_c45_pma_resume);

/**
 * genphy_c45_pma_suspend - suspends the PMA module
 * @phydev: target phy_device struct
 */
int genphy_c45_pma_suspend(struct phy_device *phydev)
{
	if (!genphy_c45_pma_can_sleep(phydev))
		return -EOPNOTSUPP;

	return phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
				MDIO_CTRL1_LPOWER);
}
EXPORT_SYMBOL_GPL(genphy_c45_pma_suspend);

/**
 * genphy_c45_pma_baset1_setup_master_slave - configures forced master/slave
 * role of BaseT1 devices.
 * @phydev: target phy_device struct
 */
int genphy_c45_pma_baset1_setup_master_slave(struct phy_device *phydev)
{
	int ctl = 0;

	switch (phydev->master_slave_set) {
	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
	case MASTER_SLAVE_CFG_MASTER_FORCE:
		ctl = MDIO_PMA_PMD_BT1_CTRL_CFG_MST;
		break;
	case MASTER_SLAVE_CFG_SLAVE_FORCE:
	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
		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 phy_modify_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_PMD_BT1_CTRL,
			     MDIO_PMA_PMD_BT1_CTRL_CFG_MST, ctl);
}
EXPORT_SYMBOL_GPL(genphy_c45_pma_baset1_setup_master_slave);

/**
 * genphy_c45_pma_setup_forced - configures a forced speed
 * @phydev: target phy_device struct
 */
int genphy_c45_pma_setup_forced(struct phy_device *phydev)
{
	int bt1_ctrl, ctrl1, ctrl2, ret;

	/* Half duplex is not supported */
	if (phydev->duplex != DUPLEX_FULL)
		return -EINVAL;

	ctrl1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
	if (ctrl1 < 0)
		return ctrl1;

	ctrl2 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2);
	if (ctrl2 < 0)
		return ctrl2;

	ctrl1 &= ~MDIO_CTRL1_SPEEDSEL;
	/*
	 * PMA/PMD type selection is 1.7.5:0 not 1.7.3:0.  See 45.2.1.6.1
	 * in 802.3-2012 and 802.3-2015.
	 */
	ctrl2 &= ~(MDIO_PMA_CTRL2_TYPE | 0x30);

	switch (phydev->speed) {
	case SPEED_10:
		if (genphy_c45_baset1_able(phydev))
			ctrl2 |= MDIO_PMA_CTRL2_BASET1;
		else
			ctrl2 |= MDIO_PMA_CTRL2_10BT;
		break;
	case SPEED_100:
		ctrl1 |= MDIO_PMA_CTRL1_SPEED100;
		ctrl2 |= MDIO_PMA_CTRL2_100BTX;
		break;
	case SPEED_1000:
		ctrl1 |= MDIO_PMA_CTRL1_SPEED1000;
		/* Assume 1000base-T */
		ctrl2 |= MDIO_PMA_CTRL2_1000BT;
		break;
	case SPEED_2500:
		ctrl1 |= MDIO_CTRL1_SPEED2_5G;
		/* Assume 2.5Gbase-T */
		ctrl2 |= MDIO_PMA_CTRL2_2_5GBT;
		break;
	case SPEED_5000:
		ctrl1 |= MDIO_CTRL1_SPEED5G;
		/* Assume 5Gbase-T */
		ctrl2 |= MDIO_PMA_CTRL2_5GBT;
		break;
	case SPEED_10000:
		ctrl1 |= MDIO_CTRL1_SPEED10G;
		/* Assume 10Gbase-T */
		ctrl2 |= MDIO_PMA_CTRL2_10GBT;
		break;
	default:
		return -EINVAL;
	}

	ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, ctrl1);
	if (ret < 0)
		return ret;

	ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2, ctrl2);
	if (ret < 0)
		return ret;

	if (genphy_c45_baset1_able(phydev)) {
		ret = genphy_c45_pma_baset1_setup_master_slave(phydev);
		if (ret < 0)
			return ret;

		bt1_ctrl = 0;
		if (phydev->speed == SPEED_1000)
			bt1_ctrl = MDIO_PMA_PMD_BT1_CTRL_STRAP_B1000;

		ret = phy_modify_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_PMD_BT1_CTRL,
				     MDIO_PMA_PMD_BT1_CTRL_STRAP, bt1_ctrl);
		if (ret < 0)
			return ret;
	}

	return genphy_c45_an_disable_aneg(phydev);
}
EXPORT_SYMBOL_GPL(genphy_c45_pma_setup_forced);

/* Sets master/slave preference and supported technologies.
 * The preference is set in the BIT(4) of BASE-T1 AN
 * advertisement register 7.515 and whether the status
 * is forced or not, it is set in the BIT(12) of BASE-T1
 * AN advertisement register 7.514.
 * Sets 10BASE-T1L Ability BIT(14) in BASE-T1 autonegotiation
 * advertisement register [31:16] if supported.
 */
static int genphy_c45_baset1_an_config_aneg(struct phy_device *phydev)
{
	u16 adv_l_mask, adv_l = 0;
	u16 adv_m_mask, adv_m = 0;
	int changed = 0;
	int ret;

	adv_l_mask = MDIO_AN_T1_ADV_L_FORCE_MS | MDIO_AN_T1_ADV_L_PAUSE_CAP |
		MDIO_AN_T1_ADV_L_PAUSE_ASYM;
	adv_m_mask = MDIO_AN_T1_ADV_M_1000BT1 | MDIO_AN_T1_ADV_M_100BT1 |
		MDIO_AN_T1_ADV_M_MST | MDIO_AN_T1_ADV_M_B10L;

	switch (phydev->master_slave_set) {
	case MASTER_SLAVE_CFG_MASTER_FORCE:
		adv_m |= MDIO_AN_T1_ADV_M_MST;
		fallthrough;
	case MASTER_SLAVE_CFG_SLAVE_FORCE:
		adv_l |= MDIO_AN_T1_ADV_L_FORCE_MS;
		break;
	case MASTER_SLAVE_CFG_MASTER_PREFERRED:
		adv_m |= MDIO_AN_T1_ADV_M_MST;
		fallthrough;
	case MASTER_SLAVE_CFG_SLAVE_PREFERRED:
		break;
	case MASTER_SLAVE_CFG_UNKNOWN:
	case MASTER_SLAVE_CFG_UNSUPPORTED:
		/* if master/slave role is not specified, do not overwrite it */
		adv_l_mask &= ~MDIO_AN_T1_ADV_L_FORCE_MS;
		adv_m_mask &= ~MDIO_AN_T1_ADV_M_MST;
		break;
	default:
		phydev_warn(phydev, "Unsupported Master/Slave mode\n");
		return -EOPNOTSUPP;
	}

	adv_l |= linkmode_adv_to_mii_t1_adv_l_t(phydev->advertising);

	ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_T1_ADV_L,
				     adv_l_mask, adv_l);
	if