[PATCH v7 net-next 05/14] net: phy: marvell-88q2xxx: add driver for the Marvell 88Q2220 PHY

Dimitri Fedrau
2024-02-18T07:58:14Z

Add a driver for the Marvell 88Q2220. This driver allows to detect the
link, switch between 100BASE-T1 and 1000BASE-T1 and switch between
master and slave mode. Autonegotiation is supported.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Gregor Herburger <gregor.herburger@ew.tq-group.com>
Signed-off-by: Dimitri Fedrau <dima.fedrau@gmail.com>
---
drivers/net/phy/marvell-88q2xxx.c | 210 +++++++++++++++++++++++++++++-
include/linux/marvell_phy.h | 1 +
2 files changed, 205 insertions(+), 6 deletions(-)

diff --git a/drivers/net/phy/marvell-88q2xxx.c b/drivers/net/phy/marvell-88q2xxx.c
index dcebb4643aff..9829facde253 100644
--- a/drivers/net/phy/marvell-88q2xxx.c
+++ b/drivers/net/phy/marvell-88q2xxx.c
@@ -1,11 +1,17 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Marvell 88Q2XXX automotive 100BASE-T1/1000BASE-T1 PHY driver
+ *
+ * Derived from Marvell Q222x API
+ *
+ * Copyright (C) 2024 Liebherr-Electronics and Drives GmbH
*/
#include <linux/ethtool_netlink.h>
#include <linux/marvell_phy.h>
#include <linux/phy.h>

+#define PHY_ID_88Q2220_REVB0 (MARVELL_PHY_ID_88Q2220 | 0x1)
+
#define MDIO_MMD_AN_MV_STAT 32769
#define MDIO_MMD_AN_MV_STAT_ANEG 0x0100
#define MDIO_MMD_AN_MV_STAT_LOCAL_RX 0x1000
@@ -13,6 +19,11 @@
#define MDIO_MMD_AN_MV_STAT_LOCAL_MASTER 0x4000
#define MDIO_MMD_AN_MV_STAT_MS_CONF_FAULT 0x8000

+#define MDIO_MMD_AN_MV_STAT2 32794
+#define MDIO_MMD_AN_MV_STAT2_AN_RESOLVED 0x0800
+#define MDIO_MMD_AN_MV_STAT2_100BT1 0x2000
+#define MDIO_MMD_AN_MV_STAT2_1000BT1 0x4000
+
#define MDIO_MMD_PCS_MV_100BT1_STAT1 33032
#define MDIO_MMD_PCS_MV_100BT1_STAT1_IDLE_ERROR 0x00ff
#define MDIO_MMD_PCS_MV_100BT1_STAT1_JABBER 0x0100
@@ -29,6 +40,42 @@

#define MDIO_MMD_PCS_MV_RX_STAT 33328

+struct mmd_val {
+ int devad;
+ u32 regnum;
+ u16 val;
+};
+
+static const struct mmd_val mv88q222x_revb0_init_seq0[] = {
+ { MDIO_MMD_PCS, 0x8033, 0x6801 },
+ { MDIO_MMD_AN, MDIO_AN_T1_CTRL, 0x0 },
+ { MDIO_MMD_PMAPMD, MDIO_CTRL1,
+ MDIO_CTRL1_LPOWER | MDIO_PMA_CTRL1_SPEED1000 },
+ { MDIO_MMD_PCS, 0xfe1b, 0x48 },
+ { MDIO_MMD_PCS, 0xffe4, 0x6b6 },
+ { MDIO_MMD_PMAPMD, MDIO_CTRL1, 0x0 },
+ { MDIO_MMD_PCS, MDIO_CTRL1, 0x0 },
+};
+
+static const struct mmd_val mv88q222x_revb0_init_seq1[] = {
+ { MDIO_MMD_PCS, 0xfe79, 0x0 },
+ { MDIO_MMD_PCS, 0xfe07, 0x125a },
+ { MDIO_MMD_PCS, 0xfe09, 0x1288 },
+ { MDIO_MMD_PCS, 0xfe08, 0x2588 },
+ { MDIO_MMD_PCS, 0xfe11, 0x1105 },
+ { MDIO_MMD_PCS, 0xfe72, 0x042c },
+ { MDIO_MMD_PCS, 0xfbba, 0xcb2 },
+ { MDIO_MMD_PCS, 0xfbbb, 0xc4a },
+ { MDIO_MMD_AN, 0x8032, 0x2020 },
+ { MDIO_MMD_AN, 0x8031, 0xa28 },
+ { MDIO_MMD_AN, 0x8031, 0xc28 },
+ { MDIO_MMD_PCS, 0xffdb, 0xfc10 },
+ { MDIO_MMD_PCS, 0xfe1b, 0x58 },
+ { MDIO_MMD_PCS, 0xfe79, 0x4 },
+ { MDIO_MMD_PCS, 0xfe5f, 0xe8 },
+ { MDIO_MMD_PCS, 0xfe05, 0x755c },
+};
+
static int mv88q2xxx_soft_reset(struct phy_device *phydev)
{
int ret;
@@ -125,24 +172,90 @@ static int mv88q2xxx_read_link_100m(struct phy_device *phydev)

static int mv88q2xxx_read_link(struct phy_device *phydev)
{
- int ret;
-
/* The 88Q2XXX PHYs do not have the PMA/PMD status register available,
* therefore we need to read the link status from the vendor specific
* registers depending on the speed.
*/
+
if (phydev->speed == SPEED_1000)
- ret = mv88q2xxx_read_link_gbit(phydev);
+ return mv88q2xxx_read_link_gbit(phydev);
+ else if (phydev->speed == SPEED_100)
+ return mv88q2xxx_read_link_100m(phydev);
+
+ phydev->link = false;
+ return 0;
+}
+
+static int mv88q2xxx_read_master_slave_state(struct phy_device *phydev)
+{
+ int ret;
+
+ phydev->master_slave_state = MASTER_SLAVE_STATE_UNKNOWN;
+ ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_MMD_AN_MV_STAT);
+ if (ret < 0)
+ return ret;
+
+ if (ret & MDIO_MMD_AN_MV_STAT_LOCAL_MASTER)
+ phydev->master_slave_state = MASTER_SLAVE_STATE_MASTER;
else
- ret = mv88q2xxx_read_link_100m(phydev);
+ phydev->master_slave_state = MASTER_SLAVE_STATE_SLAVE;

- return ret;
+ return 0;
+}
+
+static int mv88q2xxx_read_aneg_speed(struct phy_device *phydev)
+{
+ int ret;
+
+ phydev->speed = SPEED_UNKNOWN;
+ ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_MMD_AN_MV_STAT2);
+ if (ret < 0)
+ return ret;
+
+ if (!(ret & MDIO_MMD_AN_MV_STAT2_AN_RESOLVED))
+ return 0;
+
+ if (ret & MDIO_MMD_AN_MV_STAT2_100BT1)
+ phydev->speed = SPEED_100;
+ else if (ret & MDIO_MMD_AN_MV_STAT2_1000BT1)
+ phydev->speed = SPEED_1000;
+
+ return 0;
}

static int mv88q2xxx_read_status(struct phy_device *phydev)
{
int ret;

+ if (phydev->autoneg == AUTONEG_ENABLE) {
+ /* We have to get the negotiated speed first, otherwise we are
+ * not able to read the link.
+ */
+ ret = mv88q2xxx_read_aneg_speed(phydev);
+ if (ret < 0)
+ return ret;
+
+ ret = mv88q2xxx_read_link(phydev);
+ if (ret < 0)
+ return ret;
+
+ ret = genphy_c45_read_lpa(phydev);
+ if (ret < 0)
+ return ret;
+
+ ret = genphy_c45_baset1_read_status(phydev);
+ if (ret < 0)
+ return ret;
+
+ ret = mv88q2xxx_read_master_slave_state(phydev);
+ if (ret < 0)
+ return ret;
+
+ phy_resolve_aneg_linkmode(phydev);
+
+ return 0;
+ }
+
ret = mv88q2xxx_read_link(phydev);
if (ret < 0)
return ret;
@@ -171,7 +284,9 @@ static int mv88q2xxx_get_features(struct phy_device *phydev)
* sequence provided by Marvell. Disable it for now until a proper
* workaround is found or a new PHY revision is released.
*/
- linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
+ if (phydev->drv->phy_id == MARVELL_PHY_ID_88Q2110)
+ linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
+ phydev->supported);

return 0;
}
@@ -241,6 +356,75 @@ static int mv88q2xxx_get_sqi_max(struct phy_device *phydev)
return 15;
}

+static int mv88q222x_soft_reset(struct phy_device *phydev)
+{
+ int ret;
+
+ /* Enable RESET of DCL */
+ if (phydev->autoneg == AUTONEG_ENABLE || phydev->speed == SPEED_1000) {
+ ret = phy_write_mmd(phydev, MDIO_MMD_PCS, 0xfe1b, 0x48);
+ if (ret < 0)
+ return ret;
+ }
+
+ ret = phy_write_mmd(phydev, MDIO_MMD_PCS, MDIO_PCS_1000BT1_CTRL,
+ MDIO_PCS_1000BT1_CTRL_RESET);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_write_mmd(phydev, MDIO_MMD_PCS, 0xffe4, 0xc);
+ if (ret < 0)
+ return ret;
+
+ /* Disable RESET of DCL */
+ if (phydev->autoneg == AUTONEG_ENABLE || phydev->speed == SPEED_1000)
+ return phy_write_mmd(phydev, MDIO_MMD_PCS, 0xfe1b, 0x58);
+
+ return 0;
+}
+
+static int mv88q222x_config_aneg(struct phy_device *phydev)
+{
+ int ret;
+
+ ret = genphy_c45_config_aneg(phydev);
+ if (ret)
+ return ret;
+
+ return mv88q222x_soft_reset(phydev);
+}
+
+static int mv88q222x_revb0_config_init(struct phy_device *phydev)
+{
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(mv88q222x_revb0_init_seq0); i++) {
+ ret = phy_write_mmd(phydev, mv88q222x_revb0_init_seq0[i].devad,
+ mv88q222x_revb0_init_seq0[i].regnum,
+ mv88q222x_revb0_init_seq0[i].val);
+ if (ret < 0)
+ return ret;
+ }
+
+ usleep_range(5000, 10000);
+
+ for (i = 0; i < ARRAY_SIZE(mv88q222x_revb0_init_seq1); i++) {
+ ret = phy_write_mmd(phydev, mv88q222x_revb0_init_seq1[i].devad,
+ mv88q222x_revb0_init_seq1[i].regnum,
+ mv88q222x_revb0_init_seq1[i].val);
+ if (ret < 0)
+ return ret;
+ }
+
+ /* The 88Q2XXX PHYs do have the extended ability register available, but
+ * register MDIO_PMA_EXTABLE where they should signalize it does not
+ * work according to specification. Therefore, we force it here.
+ */
+ phydev->pma_extable = MDIO_PMA_EXTABLE_BT1;
+
+ return 0;
+}
+
static struct phy_driver mv88q2xxx_driver[] = {
{
.phy_id = MARVELL_PHY_ID_88Q2110,
@@ -255,12 +439,26 @@ static struct phy_driver mv88q2xxx_driver[] = {
.get_sqi = mv88q2xxx_get_sqi,
.get_sqi_max = mv88q2xxx_get_sqi_max,
},
+ {
+ PHY_ID_MATCH_EXACT(PHY_ID_88Q2220_REVB0),
+ .name = "mv88q2220",
+ .get_features = mv88q2xxx_get_features,
+ .config_aneg = mv88q222x_config_aneg,
+ .aneg_done = genphy_c45_aneg_done,
+ .config_init = mv88q222x_revb0_config_init,
+ .read_status = mv88q2xxx_read_status,
+ .soft_reset = mv88q222x_soft_reset,
+ .set_loopback = genphy_c45_loopback,
+ .get_sqi = mv88q2xxx_get_sqi,
+ .get_sqi_max = mv88q2xxx_get_sqi_max,
+ },
};

module_phy_driver(mv88q2xxx_driver);

static struct mdio_device_id __maybe_unused mv88q2xxx_tbl[] = {
{ MARVELL_PHY_ID_88Q2110, MARVELL_PHY_ID_MASK },
+ { PHY_ID_MATCH_EXACT(PHY_ID_88Q2220_REVB0), },
{ /*sentinel*/ }
};
MODULE_DEVICE_TABLE(mdio, mv88q2xxx_tbl);
diff --git a/include/linux/marvell_phy.h b/include/linux/marvell_phy.h
index 9b54c4f0677f..693eba9869e4 100644
--- a/include/linux/marvell_phy.h
+++ b/include/linux/marvell_phy.h
@@ -26,6 +26,7 @@
#define MARVELL_PHY_ID_88E2110 0x002b09b0
#define MARVELL_PHY_ID_88X2222 0x01410f10
#define MARVELL_PHY_ID_88Q2110 0x002b0980
+#define MARVELL_PHY_ID_88Q2220 0x002b0b20

/* Marvel 88E1111 in Finisar SFP module with modified PHY ID */
#define MARVELL_PHY_ID_88E1111_FINISAR 0x01ff0cc0
--
2.39.2