net: phy: add Marvell 88X2222 transceiver support

Add basic support for the Marvell 88X2222 multi-speed ethernet
transceiver.

This PHY provides data transmission over fiber-optic as well as Twinax
copper links. The 88X2222 supports 2 ports of 10GBase-R and 1000Base-X
on the line-side interface. The host-side interface supports 4 ports of
10GBase-R, RXAUI, 1000Base-X and 2 ports of XAUI.

This driver, however, supports only XAUI on the host-side and
1000Base-X/10GBase-R on the line-side, for now. The SGMII is also
supported over 1000Base-X. Interrupts are not supported.

Internal registers access compliant with the Clause 45 specification.

Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 526 insertions, 0 deletions

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 698bea312adc..a615b3660b05 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -201,6 +201,12 @@ config MARVELL_10G_PHY
 	help
 	  Support for the Marvell Alaska MV88X3310 and compatible PHYs.
 
+config MARVELL_88X2222_PHY
+	tristate "Marvell 88X2222 PHY"
+	help
+	  Support for the Marvell 88X2222 Dual-port Multi-speed Ethernet
+	  Transceiver.
+
 config MICREL_PHY
 	tristate "Micrel PHYs"
 	help
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index a13e402074cf..de683e3abe63 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -63,6 +63,7 @@ obj-$(CONFIG_LSI_ET1011C_PHY)	+= et1011c.o
 obj-$(CONFIG_LXT_PHY)		+= lxt.o
 obj-$(CONFIG_MARVELL_10G_PHY)	+= marvell10g.o
 obj-$(CONFIG_MARVELL_PHY)	+= marvell.o
+obj-$(CONFIG_MARVELL_88X2222_PHY)	+= marvell-88x2222.o
 obj-$(CONFIG_MESON_GXL_PHY)	+= meson-gxl.o
 obj-$(CONFIG_MICREL_KS8995MA)	+= spi_ks8995.o
 obj-$(CONFIG_MICREL_PHY)	+= micrel.o
diff --git a/drivers/net/phy/marvell-88x2222.c b/drivers/net/phy/marvell-88x2222.c
new file mode 100644
index 000000000000..eca8c2f20684
--- /dev/null
+++ b/drivers/net/phy/marvell-88x2222.c
@@ -0,0 +1,519 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Marvell 88x2222 dual-port multi-speed ethernet transceiver.
+ *
+ * Supports:
+ *	XAUI on the host side.
+ *	1000Base-X or 10GBase-R on the line side.
+ *	SGMII over 1000Base-X.
+ */
+#include <linux/module.h>
+#include <linux/phy.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/mdio.h>
+#include <linux/marvell_phy.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/sfp.h>
+#include <linux/netdevice.h>
+
+/* Port PCS Configuration */
+#define	MV_PCS_CONFIG		0xF002
+#define	MV_PCS_HOST_XAUI	0x73
+#define	MV_PCS_LINE_10GBR	(0x71 << 8)
+#define	MV_PCS_LINE_1GBX_AN	(0x7B << 8)
+#define	MV_PCS_LINE_SGMII_AN	(0x7F << 8)
+
+/* Port Reset and Power Down */
+#define	MV_PORT_RST	0xF003
+#define	MV_LINE_RST_SW	BIT(15)
+#define	MV_HOST_RST_SW	BIT(7)
+#define	MV_PORT_RST_SW	(MV_LINE_RST_SW | MV_HOST_RST_SW)
+
+/* 1000Base-X/SGMII Control Register */
+#define	MV_1GBX_CTRL		(0x2000 + MII_BMCR)
+
+/* 1000BASE-X/SGMII Status Register */
+#define	MV_1GBX_STAT		(0x2000 + MII_BMSR)
+
+/* 1000Base-X Auto-Negotiation Advertisement Register */
+#define	MV_1GBX_ADVERTISE	(0x2000 + MII_ADVERTISE)
+
+/* 1000Base-X PHY Specific Status Register */
+#define	MV_1GBX_PHY_STAT		0xA003
+#define	MV_1GBX_PHY_STAT_AN_RESOLVED	BIT(11)
+#define	MV_1GBX_PHY_STAT_DUPLEX		BIT(13)
+#define	MV_1GBX_PHY_STAT_SPEED100	BIT(14)
+#define	MV_1GBX_PHY_STAT_SPEED1000	BIT(15)
+
+struct mv2222_data {
+	phy_interface_t line_interface;
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported);
+};
+
+/* SFI PMA transmit enable */
+static int mv2222_tx_enable(struct phy_device *phydev)
+{
+	return phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_TXDIS,
+				  MDIO_PMD_TXDIS_GLOBAL);
+}
+
+/* SFI PMA transmit disable */
+static int mv2222_tx_disable(struct phy_device *phydev)
+{
+	return phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_TXDIS,
+				MDIO_PMD_TXDIS_GLOBAL);
+}
+
+static int mv2222_soft_reset(struct phy_device *phydev)
+{
+	int val, ret;
+
+	ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, MV_PORT_RST,
+			    MV_PORT_RST_SW);
+	if (ret < 0)
+		return ret;
+
+	return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND2, MV_PORT_RST,
+					 val, !(val & MV_PORT_RST_SW),
+					 5000, 1000000, true);
+}
+
+/* Returns negative on error, 0 if link is down, 1 if link is up */
+static int mv2222_read_status_10g(struct phy_device *phydev)
+{
+	int val, link = 0;
+
+	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_STAT1);
+	if (val < 0)
+		return val;
+
+	if (val & MDIO_STAT1_LSTATUS) {
+		link = 1;
+
+		/* 10GBASE-R do not support auto-negotiation */
+		phydev->autoneg = AUTONEG_DISABLE;
+		phydev->speed = SPEED_10000;
+		phydev->duplex = DUPLEX_FULL;
+	}
+
+	return link;
+}
+
+/* Returns negative on error, 0 if link is down, 1 if link is up */
+static int mv2222_read_status_1g(struct phy_device *phydev)
+{
+	int val, link = 0;
+
+	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MV_1GBX_STAT);
+	if (val < 0)
+		return val;
+
+	if (!(val & BMSR_LSTATUS) ||
+	    (phydev->autoneg == AUTONEG_ENABLE &&
+	     !(val & BMSR_ANEGCOMPLETE)))
+		return 0;
+
+	link = 1;
+
+	val = phy_read_mmd(phydev, MDIO_MMD_PCS, MV_1GBX_PHY_STAT);
+	if (val < 0)
+		return val;
+
+	if (val & MV_1GBX_PHY_STAT_AN_RESOLVED) {
+		if (val & MV_1GBX_PHY_STAT_DUPLEX)
+			phydev->duplex = DUPLEX_FULL;
+		else
+			phydev->duplex = DUPLEX_HALF;
+
+		if (val & MV_1GBX_PHY_STAT_SPEED1000)
+			phydev->speed = SPEED_1000;
+		else if (val & MV_1GBX_PHY_STAT_SPEED100)
+			phydev->speed = SPEED_100;
+		else
+			phydev->speed = SPEED_10;
+	}
+
+	return link;
+}
+
+static int mv2222_read_status(struct phy_device *phydev)
+{
+	struct mv2222_data *priv = phydev->priv;
+	int link;
+
+	phydev->link = 0;
+	phydev->speed = SPEED_UNKNOWN;
+	phydev->duplex = DUPLEX_UNKNOWN;
+
+	if (priv->line_interface == PHY_INTERFACE_MODE_10GBASER)
+		link = mv2222_read_status_10g(phydev);
+	else
+		link = mv2222_read_status_1g(phydev);
+
+	if (link < 0)
+		return link;
+
+	phydev->link = link;
+
+	return 0;
+}
+
+static int mv2222_disable_aneg(struct phy_device *phydev)
+{
+	int ret = phy_clear_bits_mmd(phydev, MDIO_MMD_PCS, MV_1GBX_CTRL,
+				     BMCR_ANENABLE | BMCR_ANRESTART);
+	if (ret < 0)
+		return ret;
+
+	return mv2222_soft_reset(phydev);
+}
+
+static int mv2222_enable_aneg(struct phy_device *phydev)
+{
+	int ret = phy_set_bits_mmd(phydev, MDIO_MMD_PCS, MV_1GBX_CTRL,
+				   BMCR_ANENABLE | BMCR_RESET);
+	if (ret < 0)
+		return ret;
+
+	return mv2222_soft_reset(phydev);
+}
+
+static int mv2222_set_sgmii_speed(struct phy_device *phydev)
+{
+	struct mv2222_data *priv = phydev->priv;
+
+	switch (phydev->speed) {
+	default:
+	case SPEED_1000:
+		if ((linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
+				       priv->supported) ||
+		     linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT,
+				       priv->supported)))
+			return phy_modify_mmd(phydev, MDIO_MMD_PCS,
+					      MV_1GBX_CTRL,
+					      BMCR_SPEED1000 | BMCR_SPEED100,
+					      BMCR_SPEED1000);
+
+		fallthrough;
+	case SPEED_100:
+		if ((linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
+				       priv->supported) ||
+		     linkmode_test_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
+				       priv->supported)))
+			return phy_modify_mmd(phydev, MDIO_MMD_PCS,
+					      MV_1GBX_CTRL,
+					      BMCR_SPEED1000 | BMCR_SPEED100,
+					      BMCR_SPEED100);
+		fallthrough;
+	case SPEED_10:
+		if ((linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
+				       priv->supported) ||
+		     linkmode_test_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
+				       priv->supported)))
+			return phy_modify_mmd(phydev, MDIO_MMD_PCS,
+					      MV_1GBX_CTRL,
+					      BMCR_SPEED1000 | BMCR_SPEED100,
+					      BMCR_SPEED10);
+
+		return -EINVAL;
+	}
+}
+
+static bool mv2222_is_10g_capable(struct phy_device *phydev)
+{
+	struct mv2222_data *priv = phydev->priv;
+
+	return (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
+				  priv->supported) ||
+		linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseCR_Full_BIT,
+				  priv->supported) ||
+		linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
+				  priv->supported) ||
+		linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
+				  priv->supported) ||
+		linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT,
+				  priv->supported) ||
+		linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseER_Full_BIT,
+				  priv->supported));
+}
+
+static bool mv2222_is_1gbx_capable(struct phy_device *phydev)
+{
+	struct mv2222_data *priv = phydev->priv;
+
+	return linkmode_test_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT,
+				 priv->supported);
+}
+
+static int mv2222_config_line(struct phy_device *phydev)
+{
+	struct mv2222_data *priv = phydev->priv;
+
+	switch (priv->line_interface) {
+	case PHY_INTERFACE_MODE_10GBASER:
+		return phy_write_mmd(phydev, MDIO_MMD_VEND2, MV_PCS_CONFIG,
+				     MV_PCS_HOST_XAUI | MV_PCS_LINE_10GBR);
+	case PHY_INTERFACE_MODE_1000BASEX:
+		return phy_write_mmd(phydev, MDIO_MMD_VEND2, MV_PCS_CONFIG,
+				     MV_PCS_HOST_XAUI | MV_PCS_LINE_1GBX_AN);
+	case PHY_INTERFACE_MODE_SGMII:
+		return phy_write_mmd(phydev, MDIO_MMD_VEND2, MV_PCS_CONFIG,
+				     MV_PCS_HOST_XAUI | MV_PCS_LINE_SGMII_AN);
+	default:
+		return -EINVAL;
+	}
+}
+
+static int mv2222_setup_forced(struct phy_device *phydev)
+{
+	struct mv2222_data *priv = phydev->priv;
+	bool changed = false;
+	int ret;
+
+	switch (priv->line_interface) {
+	case PHY_INTERFACE_MODE_10GBASER:
+		if (phydev->speed == SPEED_1000 &&
+		    mv2222_is_1gbx_capable(phydev)) {
+			priv->line_interface = PHY_INTERFACE_MODE_1000BASEX;
+			changed = true;
+		}
+
+		break;
+	case PHY_INTERFACE_MODE_1000BASEX:
+		if (phydev->speed == SPEED_10000 &&
+		    mv2222_is_10g_capable(phydev)) {
+			priv->line_interface = PHY_INTERFACE_MODE_10GBASER;
+			changed = true;
+		}
+
+		break;
+	case PHY_INTERFACE_MODE_SGMII:
+		ret = mv2222_set_sgmii_speed(phydev);
+		if (ret < 0)
+			return ret;
+
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	if (changed) {
+		ret = mv2222_config_line(phydev);
+		if (ret < 0)
+			return ret;
+	}
+
+	return mv2222_disable_aneg(phydev);
+}
+
+static int mv2222_config_aneg(struct phy_device *phydev)
+{
+	struct mv2222_data *priv = phydev->priv;
+	int ret, adv;
+
+	/* SFP is not present, do nothing */
+	if (priv->line_interface == PHY_INTERFACE_MODE_NA)
+		return 0;
+
+	if (phydev->autoneg == AUTONEG_DISABLE ||
+	    phydev->speed == SPEED_10000)
+		return mv2222_setup_forced(phydev);
+
+	if (priv->line_interface == PHY_INTERFACE_MODE_10GBASER &&
+	    mv2222_is_1gbx_capable(phydev)) {
+		priv->line_interface = PHY_INTERFACE_MODE_1000BASEX;
+		ret = mv2222_config_line(phydev);
+		if (ret < 0)
+			return ret;
+	}
+
+	adv = linkmode_adv_to_mii_adv_x(priv->supported,
+					ETHTOOL_LINK_MODE_1000baseX_Full_BIT);
+
+	ret = phy_modify_mmd(phydev, MDIO_MMD_PCS, MV_1GBX_ADVERTISE,
+			     ADVERTISE_1000XFULL |
+			     ADVERTISE_1000XPAUSE | ADVERTISE_1000XPSE_ASYM,
+			     adv);
+	if (ret < 0)
+		return ret;
+
+	return mv2222_enable_aneg(phydev);
+}
+
+static int mv2222_aneg_done(struct phy_device *phydev)
+{
+	int ret;
+
+	if (mv2222_is_10g_capable(phydev)) {
+		ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MDIO_STAT1);
+		if (ret < 0)
+			return ret;
+
+		if (ret & MDIO_STAT1_LSTATUS)
+			return 1;
+	}
+
+	ret = phy_read_mmd(phydev, MDIO_MMD_PCS, MV_1GBX_STAT);
+	if (ret < 0)
+		return ret;
+
+	return (ret & BMSR_ANEGCOMPLETE);
+}
+
+static int mv2222_resume(struct phy_device *phydev)
+{
+	return mv2222_tx_enable(phydev);
+}
+
+static int mv2222_suspend(struct phy_device *phydev)
+{
+	return mv2222_tx_disable(phydev);
+}
+
+static int mv2222_get_features(struct phy_device *phydev)
+{
+	/* All supported linkmodes are set at probe */
+
+	return 0;
+}
+
+static int mv2222_config_init(struct phy_device *phydev)
+{
+	if (phydev->interface != PHY_INTERFACE_MODE_XAUI)
+		return -EINVAL;
+
+	phydev->autoneg = AUTONEG_DISABLE;
+
+	return 0;
+}
+
+static int mv2222_sfp_insert(void *upstream, const struct sfp_eeprom_id *id)
+{
+	struct phy_device *phydev = upstream;
+	phy_interface_t sfp_interface;
+	struct mv2222_data *priv;
+	struct device *dev;
+	int ret;
+
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(sfp_supported) = { 0, };
+
+	priv = (struct mv2222_data *)phydev->priv;
+	dev = &phydev->mdio.dev;
+
+	sfp_parse_support(phydev->sfp_bus, id, sfp_supported);
+	sfp_interface = sfp_select_interface(phydev->sfp_bus, sfp_supported);
+
+	dev_info(dev, "%s SFP module inserted\n", phy_modes(sfp_interface));
+
+	if (sfp_interface != PHY_INTERFACE_MODE_10GBASER &&
+	    sfp_interface != PHY_INTERFACE_MODE_1000BASEX &&
+	    sfp_interface != PHY_INTERFACE_MODE_SGMII) {
+		dev_err(dev, "Incompatible SFP module inserted\n");
+
+		return -EINVAL;
+	}
+
+	priv->line_interface = sfp_interface;
+	linkmode_and(priv->supported, phydev->supported, sfp_supported);
+
+	ret = mv2222_config_line(phydev);
+	if (ret < 0)
+		return ret;
+
+	if (mutex_trylock(&phydev->lock)) {
+		if (priv->line_interface == PHY_INTERFACE_MODE_10GBASER)
+			ret = mv2222_setup_forced(phydev);
+		else
+			ret = mv2222_config_aneg(phydev);
+
+		mutex_unlock(&phydev->lock);
+	}
+
+	return ret;
+}
+
+static void mv2222_sfp_remove(void *upstream)
+{
+	struct phy_device *phydev = upstream;
+	struct mv2222_data *priv;
+
+	priv = (struct mv2222_data *)phydev->priv;
+
+	priv->line_interface = PHY_INTERFACE_MODE_NA;
+	linkmode_zero(priv->supported);
+}
+
+static const struct sfp_upstream_ops sfp_phy_ops = {
+	.module_insert = mv2222_sfp_insert,
+	.module_remove = mv2222_sfp_remove,
+	.attach = phy_sfp_attach,
+	.detach = phy_sfp_detach,
+};
+
+static int mv2222_probe(struct phy_device *phydev)
+{
+	struct device *dev = &phydev->mdio.dev;
+	struct mv2222_data *priv = NULL;
+
+	__ETHTOOL_DECLARE_LINK_MODE_MASK(supported) = { 0, };
+
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_TP_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseX_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseCR_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseLR_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT, supported);
+	linkmode_set_bit(ETHTOOL_LINK_MODE_10000baseER_Full_BIT, supported);
+
+	linkmode_copy(phydev->supported, supported);
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->line_interface = PHY_INTERFACE_MODE_NA;
+	phydev->priv = priv;
+
+	return phy_sfp_probe(phydev, &sfp_phy_ops);
+}
+
+static struct phy_driver mv2222_drivers[] = {
+	{
+		.phy_id = MARVELL_PHY_ID_88X2222,
+		.phy_id_mask = MARVELL_PHY_ID_MASK,
+		.name = "Marvell 88X2222",
+		.get_features = mv2222_get_features,
+		.soft_reset = mv2222_soft_reset,
+		.config_init = mv2222_config_init,
+		.config_aneg = mv2222_config_aneg,
+		.aneg_done = mv2222_aneg_done,
+		.probe = mv2222_probe,
+		.suspend = mv2222_suspend,
+		.resume = mv2222_resume,
+		.read_status = mv2222_read_status,
+	},
+};
+module_phy_driver(mv2222_drivers);
+
+static struct mdio_device_id __maybe_unused mv2222_tbl[] = {
+	{ MARVELL_PHY_ID_88X2222, MARVELL_PHY_ID_MASK },
+	{ }
+};
+MODULE_DEVICE_TABLE(mdio, mv2222_tbl);
+
+MODULE_DESCRIPTION("Marvell 88x2222 ethernet transceiver driver");
+MODULE_LICENSE("GPL");