For each networking SerDes lane on certain Layerscape SoCs, there is a block, based on an IP core from MoreThanIP, which optionally handles IEEE 802.3 clause 73 and clause 72, i.e. backplane auto-negotiation and link training. The hardware integration between the SerDes lane and this AN/LT block is rather weak. For this reason, there is no automatic link training performed in hardware, but rather, software needs to implement a custom, SerDes-specific link training algorithm and use the AN/LT registers to communicate it with the link partner. This driver is an inapt attempt to do just that. Since the MTIP AN/LT block may be, in premise, integrated in non-NXP SoCs as well, the networking PHY driver implementation is as generic as possible. Initial support is present only for the LX2160A SoC and the single-lane link modes (10G, 25G). For this SoC, the register map of the IP block was a bit mangled, and we don't have any PHY ID. I didn't want to invent one, so this driver probes on a specific compatible string, plus the secondary "ethernet-phy-ieee802.3-c45" which makes the PHY library recognize it as a clause 45 PHY and not an mdio_device. Signed-off-by: Vladimir Oltean <vladimir.oltean@xxxxxxx> --- drivers/net/phy/Kconfig | 7 + drivers/net/phy/Makefile | 1 + drivers/net/phy/mtip_backplane.c | 1735 ++++++++++++++++++++++++++++++ 3 files changed, 1743 insertions(+) create mode 100644 drivers/net/phy/mtip_backplane.c diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 107880d13d21..536ce9f118c5 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -290,6 +290,13 @@ config MOTORCOMM_PHY Enables support for Motorcomm network PHYs. Currently supports YT85xx Gigabit Ethernet PHYs. +config MTIP_BACKPLANE_PHY + tristate "MoreThanIP copper backplane PHYs" + help + Enable support for the MoreThanIP copper backplane Auto-Negotiation + and Link Training blocks, as implemented on the QorIQ and Layerscape + SoCs. + config NATIONAL_PHY tristate "National Semiconductor PHYs" help diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile index c945ed9bd14b..06ef4b59e223 100644 --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -81,6 +81,7 @@ obj-$(CONFIG_MICROCHIP_T1_PHY) += microchip_t1.o obj-$(CONFIG_MICROCHIP_T1S_PHY) += microchip_t1s.o obj-$(CONFIG_MICROSEMI_PHY) += mscc/ obj-$(CONFIG_MOTORCOMM_PHY) += motorcomm.o +obj-$(CONFIG_MTIP_BACKPLANE_PHY) += mtip_backplane.o obj-$(CONFIG_NATIONAL_PHY) += national.o obj-$(CONFIG_NCN26000_PHY) += ncn26000.o obj-$(CONFIG_NXP_C45_TJA11XX_PHY) += nxp-c45-tja11xx.o diff --git a/drivers/net/phy/mtip_backplane.c b/drivers/net/phy/mtip_backplane.c new file mode 100644 index 000000000000..09eeaff653aa --- /dev/null +++ b/drivers/net/phy/mtip_backplane.c @@ -0,0 +1,1735 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Driver for MoreThanIP copper backplane AN/LT (Auto-Negotiation and + * Link Training) core + * + * Copyright 2023 NXP + */ + +#include <linux/kernel.h> +#include <linux/mii.h> +#include <linux/module.h> +#include <linux/of_mdio.h> +#include <linux/phy.h> +#include <linux/phy/phy.h> +#include <linux/clk.h> + +#define BP_ETH_STAT_ALWAYS_1 BIT(0) +#define BP_ETH_STAT_1GKX BIT(1) +#define BP_ETH_STAT_10GKX4 BIT(2) +#define BP_ETH_STAT_10GKR BIT(3) +#define BP_ETH_STAT_FC_FEC BIT(4) +#define BP_ETH_STAT_40GKR4 BIT(5) +#define BP_ETH_STAT_40GCR4 BIT(6) +#define BP_ETH_STAT_RS_FEC BIT(7) +#define BP_ETH_STAT_100GCR10 BIT(8) +#define BP_ETH_STAT_100GKP4 BIT(9) +#define BP_ETH_STAT_100GKR4 BIT(10) +#define BP_ETH_STAT_100GCR4 BIT(11) +#define BP_ETH_STAT_25GKRS BIT(12) +#define BP_ETH_STAT_25GKR BIT(13) + +#define BP_ETH_STAT_PARALLEL_DETECT (BP_ETH_STAT_ALWAYS_1 | \ + BP_ETH_STAT_1GKX | \ + BP_ETH_STAT_10GKX4) + +#define LT_CTRL_RESTART_TRAINING BIT(0) +#define LT_CTRL_TRAINING_ENABLE BIT(1) + +#define LT_STAT_RX_STATUS BIT(0) +#define LT_STAT_FRAME_LOCK BIT(1) +#define LT_STAT_IN_PROGRESS BIT(2) +#define LT_STAT_FAIL BIT(3) +#define LT_STAT_SIGNAL_DETECT BIT(15) + +#define LT_COM1_MASK GENMASK(1, 0) +#define LT_COZ_MASK GENMASK(3, 2) +#define LT_COP1_MASK GENMASK(5, 4) +#define LT_COM1(x) ((x) & LT_COM1_MASK) +#define LT_COM1_X(x) ((x) & LT_COM1_MASK) +#define LT_COZ(x) (((x) << 2) & LT_COZ_MASK) +#define LT_COZ_X(x) (((x) & LT_COZ_MASK) >> 2) +#define LT_COP1(x) (((x) << 4) & LT_COP1_MASK) +#define LT_COP1_X(x) (((x) & LT_COP1_MASK) >> 4) + +#define LT_COEF_STAT_MASK (LT_COM1_MASK | LT_COZ_MASK | LT_COP1_MASK) +#define LT_COEF_STAT_ALL_NOT_UPDATED(x) (((x) & LT_COEF_STAT_MASK) == 0) +#define LT_COEF_STAT_ANY_UPDATED(x) (((x) & LT_COEF_STAT_MASK) != 0) + +#define LT_COEF_UPD_MASK (LT_COM1_MASK | LT_COZ_MASK | LT_COP1_MASK) +#define LT_COEF_UPD_ALL_HOLD (LT_COM1(COEF_UPD_HOLD) | \ + LT_COZ(COEF_UPD_HOLD) | \ + LT_COP1(COEF_UPD_HOLD)) + +#define LT_COEF_UPD_ANYTHING(x) ((x) != 0) +#define LT_COEF_UPD_NOTHING(x) ((x) == 0) + +#define LT_COEF_UPD_INIT BIT(12) +#define LT_COEF_UPD_PRESET BIT(13) + +#define LT_COEF_STAT_RX_READY BIT(15) + +#define C73_ADV_0(x) (u16)((x) & GENMASK(15, 0)) +#define C73_ADV_1(x) (u16)(((x) & GENMASK(31, 16)) >> 16) +#define C73_ADV_2(x) (u16)(((x) & GENMASK_ULL(47, 32)) >> 32) + +#define IRQPOLL_INTERVAL (HZ / 4) + +#define MTIP_CDR_SLEEP_US 100 +#define MTIP_CDR_TIMEOUT_US 100000 + +#define MTIP_LT_RESTART_SLEEP_US 10 +#define MTIP_LT_RESTART_TIMEOUT_US 100 + +#define MTIP_FRAME_LOCK_SLEEP_US 10 +#define MTIP_FRAME_LOCK_TIMEOUT_US 100 + +#define MTIP_RESET_SLEEP_US 100 +#define MTIP_RESET_TIMEOUT_US 100000 + +#define MTIP_BP_ETH_STAT_SLEEP_US 10 +#define MTIP_BP_ETH_STAT_TIMEOUT_US 100 + +#define MTIP_COEF_STAT_SLEEP_US 10 +#define MTIP_COEF_STAT_TIMEOUT_US 500000 + +#define MTIP_AN_TIMEOUT_MS 10000 + +enum mtip_an_reg { + AN_CTRL, + AN_STAT, + AN_ADV_0, + AN_ADV_1, + AN_ADV_2, + AN_LPA_0, + AN_LPA_1, + AN_LPA_2, + AN_MS_CNT, + AN_ADV_XNP_0, + AN_ADV_XNP_1, + AN_ADV_XNP_2, + AN_LPA_XNP_0, + AN_LPA_XNP_1, + AN_LPA_XNP_2, + AN_BP_ETH_STAT, +}; + +enum mtip_lt_reg { + LT_CTRL, + LT_STAT, + LT_LP_COEF, + LT_LP_STAT, + LT_LD_COEF, + LT_LD_STAT, + LT_TRAIN_PATTERN, + LT_RX_PATTERN, + LT_RX_PATTERN_ERR, + LT_RX_PATTERN_BEGIN, +}; + +struct mtip_irqpoll { + struct phy_device *phydev; + struct mutex lock; + struct delayed_work work; + u16 old_an_stat; + u16 old_pcs_stat; + bool link; + bool link_ack; + bool cdr_locked; +}; + +struct mtip_lt_work { + struct phy_device *phydev; + struct kthread_work work; +}; + +struct mtip_backplane { + struct phy *serdes; + struct mdio_device *pcs; + const u16 *an_regs; + const u16 *lt_regs; + int lt_mmd; + enum ethtool_link_mode_bit_indices link_mode; + bool link_mode_resolved; + unsigned long last_an_restart; + struct mtip_irqpoll irqpoll; + struct kthread_worker *local_tx_lt_worker; + struct kthread_worker *remote_tx_lt_worker; + /* Serialized by an_restart_lock */ + bool an_restart_pending; + bool an_enabled; + /* Used for orderly shutdown of LT threads. Modified without any + * locking. Set to true only by the irqpoll thread, set to false + * by irqpoll and by the LT threads. + */ + bool lt_enabled; + bool local_tx_lt_done; + bool remote_tx_lt_done; + /* Serialize concurrent attempts from the local TX and remote TX + * kthreads to finalize their side of the link training + */ + struct mutex lt_lock; + struct mutex an_restart_lock; +}; + +#define phydev_to_irqpoll(phydev) \ + (&((struct mtip_backplane *)(phydev)->priv)->irqpoll) + +/* Auto-Negotiation Control and Status Registers are on page 0: 0x0 */ +static const u16 mtip_lx2160a_an_regs[] = { + [AN_CTRL] = 0, + [AN_STAT] = 1, + [AN_ADV_0] = 2, + [AN_ADV_1] = 3, + [AN_ADV_2] = 4, + [AN_LPA_0] = 5, + [AN_LPA_1] = 6, + [AN_LPA_2] = 7, + [AN_MS_CNT] = 8, + [AN_ADV_XNP_0] = 9, + [AN_ADV_XNP_1] = 10, + [AN_ADV_XNP_2] = 11, + [AN_LPA_XNP_0] = 12, + [AN_LPA_XNP_1] = 13, + [AN_LPA_XNP_2] = 14, + [AN_BP_ETH_STAT] = 15, +}; + +/* Link Training Control and Status Registers are on page 1: 256 = 0x100 */ +static const u16 mtip_lx2160a_lt_regs[] = { + [LT_CTRL] = 0x100, + [LT_STAT] = 0x101, + [LT_LP_COEF] = 0x102, + [LT_LP_STAT] = 0x103, + [LT_LD_COEF] = 0x104, + [LT_LD_STAT] = 0x105, + [LT_TRAIN_PATTERN] = 0x108, + [LT_RX_PATTERN] = 0x109, + [LT_RX_PATTERN_ERR] = 0x10a, + [LT_RX_PATTERN_BEGIN] = 0x10b, +}; + +static const enum ethtool_link_mode_bit_indices mtip_backplane_link_modes[] = { + ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, + ETHTOOL_LINK_MODE_25000baseKR_Full_BIT, +}; + +static const char * +ethtool_link_mode_str(enum ethtool_link_mode_bit_indices link_mode) +{ + switch (link_mode) { + case ETHTOOL_LINK_MODE_1000baseKX_Full_BIT: + return "1000base-KX"; + case ETHTOOL_LINK_MODE_10000baseKR_Full_BIT: + return "10Gbase-KR"; + case ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT: + return "40Gbase-KR4"; + case ETHTOOL_LINK_MODE_25000baseKR_Full_BIT: + return "25Gbase-KR"; + case ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT: + return "100Gbase-KR4"; + default: + return "unknown"; + } +} + +static bool +link_mode_needs_training(enum ethtool_link_mode_bit_indices link_mode) +{ + if (link_mode == ETHTOOL_LINK_MODE_1000baseKX_Full_BIT) + return false; + + return true; +} + +static int mtip_read_an(struct phy_device *phydev, enum mtip_an_reg reg) +{ + struct mtip_backplane *priv = phydev->priv; + + return phy_read_mmd(phydev, MDIO_MMD_AN, priv->an_regs[reg]); +} + +static int mtip_write_an(struct phy_device *phydev, enum mtip_an_reg reg, + u16 val) +{ + struct mtip_backplane *priv = phydev->priv; + + return phy_write_mmd(phydev, MDIO_MMD_AN, priv->an_regs[reg], val); +} + +static int mtip_modify_an(struct phy_device *phydev, enum mtip_an_reg reg, + u16 mask, u16 set) +{ + struct mtip_backplane *priv = phydev->priv; + + return phy_modify_mmd(phydev, MDIO_MMD_AN, priv->an_regs[reg], + mask, set); +} + +static int mtip_read_lt(struct phy_device *phydev, enum mtip_lt_reg reg) +{ + struct mtip_backplane *priv = phydev->priv; + + return phy_read_mmd(phydev, priv->lt_mmd, priv->lt_regs[reg]); +} + +static int mtip_write_lt(struct phy_device *phydev, enum mtip_lt_reg reg, + u16 val) +{ + struct mtip_backplane *priv = phydev->priv; + + return phy_write_mmd(phydev, priv->lt_mmd, priv->lt_regs[reg], val); +} + +static int mtip_modify_lt(struct phy_device *phydev, enum mtip_lt_reg reg, + u16 mask, u16 set) +{ + struct mtip_backplane *priv = phydev->priv; + + return phy_modify_mmd(phydev, priv->lt_mmd, priv->lt_regs[reg], + mask, set); +} + +static int mtip_read_pcs(struct phy_device *phydev, int reg) +{ + struct mtip_backplane *priv = phydev->priv; + struct mdio_device *pcs = priv->pcs; + + return mdiodev_c45_read(pcs, MDIO_MMD_PCS, reg); +} + +static int mtip_modify_pcs(struct phy_device *phydev, int reg, u16 mask, + u16 set) +{ + struct mtip_backplane *priv = phydev->priv; + struct mdio_device *pcs = priv->pcs; + + return mdiodev_c45_modify(pcs, MDIO_MMD_PCS, reg, mask, set); +} + +static int mtip_reset_an(struct phy_device *phydev) +{ + int err, val; + + err = mtip_modify_an(phydev, AN_CTRL, MDIO_CTRL1_RESET, + MDIO_CTRL1_RESET); + if (err < 0) + return err; + + err = read_poll_timeout(mtip_read_an, val, + val < 0 || !(val & MDIO_CTRL1_RESET), + MTIP_RESET_SLEEP_US, MTIP_RESET_TIMEOUT_US, + false, phydev, AN_CTRL); + + return (val < 0) ? val : err; +} + +static int mtip_reset_pcs(struct phy_device *phydev) +{ + int err, val; + + err = mtip_modify_pcs(phydev, MDIO_CTRL1, MDIO_CTRL1_RESET, + MDIO_CTRL1_RESET); + if (err < 0) + return err; + + err = read_poll_timeout(mtip_read_pcs, val, + val < 0 || !(val & MDIO_CTRL1_RESET), + MTIP_RESET_SLEEP_US, MTIP_RESET_TIMEOUT_US, + false, phydev, MDIO_CTRL1); + + return (val < 0) ? val : err; +} + +static int mtip_wait_for_cdr_lock(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + bool cdr_locked; + int err, val; + + err = read_poll_timeout(phy_check_cdr_lock, val, + val < 0 || cdr_locked, + MTIP_CDR_SLEEP_US, MTIP_CDR_TIMEOUT_US, + false, priv->serdes, &cdr_locked); + + return (val < 0) ? val : err; +} + +static int mtip_lx2160a_get_features(struct phy_device *phydev) +{ + const enum ethtool_link_mode_bit_indices *link_modes; + struct mtip_backplane *priv = phydev->priv; + int i, err; + + linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported); + linkmode_set_bit(ETHTOOL_LINK_MODE_Backplane_BIT, phydev->supported); + linkmode_set_bit(ETHTOOL_LINK_MODE_Pause_BIT, phydev->supported); + linkmode_set_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT, phydev->supported); + + link_modes = mtip_backplane_link_modes; + + /* Ask the SerDes driver what link modes are supported, + * based on the current PLL configuration. + */ + for (i = 0; i < ARRAY_SIZE(mtip_backplane_link_modes); i++) { + err = phy_validate(priv->serdes, PHY_MODE_ETHERNET_PHY, + link_modes[i], NULL); + if (err) + continue; + + linkmode_set_bit(link_modes[i], phydev->supported); + } + + return 0; +} + +static int mtip_lt_frame_lock(struct phy_device *phydev) +{ + int err, val; + + err = read_poll_timeout(mtip_read_lt, val, + val < 0 || (val & LT_STAT_FRAME_LOCK), + MTIP_FRAME_LOCK_SLEEP_US, MTIP_FRAME_LOCK_TIMEOUT_US, + false, phydev, LT_CTRL); + + return (val < 0) ? val : err; +} + +static int mtip_restart_lt(struct phy_device *phydev, bool enable) +{ + u16 mask = LT_CTRL_RESTART_TRAINING | LT_CTRL_TRAINING_ENABLE; + u16 set = LT_CTRL_RESTART_TRAINING; + int err, val; + + if (enable) + set |= LT_CTRL_TRAINING_ENABLE; + + err = mtip_modify_lt(phydev, LT_CTRL, mask, set); + if (err < 0) + return err; + + err = read_poll_timeout(mtip_read_lt, val, + val < 0 || !(val & LT_CTRL_RESTART_TRAINING), + MTIP_LT_RESTART_SLEEP_US, MTIP_LT_RESTART_TIMEOUT_US, + false, phydev, LT_CTRL); + + return (val < 0) ? val : err; +} + +/* Enable the lane datapath by disconnecting it from the AN/LT block + * and connecting it to the PCS. This is called both from the irqpoll thread, + * as well as from the last link training kthread to finish. + */ +static int mtip_finish_lt(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + int err; + + err = mtip_restart_lt(phydev, false); + if (err) { + phydev_err(phydev, "Failed to disable link training: %pe\n", + ERR_PTR(err)); + return err; + } + + /* Subsequent attempts to disable LT will time out, so stop them */ + WRITE_ONCE(priv->lt_enabled, false); + + return 0; +} + +static int mtip_stop_lt(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + struct mtip_backplane *priv = phydev->priv; + int err; + + lockdep_assert_held(&irqpoll->lock); + + kthread_flush_worker(priv->remote_tx_lt_worker); + kthread_flush_worker(priv->local_tx_lt_worker); + + err = mtip_finish_lt(phydev); + if (err) + return err; + + phydev_dbg(phydev, "Link training disabled\n"); + + return 0; +} + +static int mtip_reset_lt(struct phy_device *phydev) +{ + int err; + + /* Don't allow AN to complete without training */ + err = mtip_modify_lt(phydev, LT_STAT, LT_STAT_RX_STATUS, 0); + if (err < 0) + return err; + + err = mtip_write_lt(phydev, LT_LD_COEF, 0); + if (err < 0) + return err; + + err = mtip_write_lt(phydev, LT_LD_STAT, 0); + if (err < 0) + return err; + + return 0; +} + +/* Reset state when detecting that the previously determined link mode + * is no longer valid + */ +static int mtip_state_reset(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + int err; + + priv->link_mode_resolved = false; + + if (READ_ONCE(priv->lt_enabled)) { + err = mtip_stop_lt(phydev); + if (err) + return err; + } + + err = mtip_reset_lt(phydev); + if (err < 0) + return err; + + return 0; +} + +/* Make sure we don't act on old event bits from previous runs when + * we restart autoneg. + */ +static int mtip_unlatch_an_stat(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + int val; + + lockdep_assert_held(&irqpoll->lock); + + val = mtip_read_an(phydev, AN_STAT); + if (val < 0) + return val; + + /* Discard the current AN status, it will become invalid soon */ + irqpoll->old_an_stat = 0; + + return 0; +} + +/* Suppress a "PCS link dropped, restarting autoneg" event when initiating + * an autoneg restart locally. + */ +static int mtip_unlatch_pcs_stat(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + + irqpoll->old_pcs_stat = 0; + + return 0; +} + +static int mtip_read_adv(struct phy_device *phydev, u64 *base_page) +{ + int val; + + val = mtip_read_an(phydev, AN_ADV_0); + if (val < 0) + return val; + + *base_page = (u64)val; + + val = mtip_read_an(phydev, AN_ADV_1); + if (val < 0) + return val; + + *base_page |= (u64)val << 16; + + val = mtip_read_an(phydev, AN_ADV_2); + if (val < 0) + return val; + + *base_page |= (u64)val << 32; + + return 0; +} + +static int mtip_write_adv(struct phy_device *phydev, u64 base_page) +{ + int val; + + val = mtip_write_an(phydev, AN_ADV_0, C73_ADV_0(base_page)); + if (val < 0) + return val; + + val = mtip_write_an(phydev, AN_ADV_1, C73_ADV_1(base_page)); + if (val < 0) + return val; + + val = mtip_write_an(phydev, AN_ADV_2, C73_ADV_2(base_page)); + if (val < 0) + return val; + + return 0; +} + +static int mtip_read_lpa(struct phy_device *phydev, u64 *base_page) +{ + int val; + + val = mtip_read_an(phydev, AN_LPA_0); + if (val < 0) + return val; + + *base_page = (u64)val; + + val = mtip_read_an(phydev, AN_LPA_1); + if (val < 0) + return val; + + *base_page |= (u64)val << 16; + + val = mtip_read_an(phydev, AN_LPA_2); + if (val < 0) + return val; + + *base_page |= (u64)val << 32; + + return 0; +} + +static int mtip_config_an_adv(struct phy_device *phydev) +{ + u64 base_page = linkmode_adv_to_c73_base_page(phydev->advertising); + u8 nonce; + + /* The transmitted nonce must not be equal with the one transmitted by + * the link partner, otherwise AN will not complete (nonce_match=true). + * With purely randomly generated nonces, that is always a chance + * though. 98.2.1.2.3 Transmitted Nonce Field gives a way for + * management to avoid that. + */ + get_random_bytes(&nonce, sizeof(nonce)); + + switch (phydev->master_slave_set) { + case MASTER_SLAVE_CFG_MASTER_PREFERRED: + case MASTER_SLAVE_CFG_MASTER_FORCE: + nonce |= BIT(4); + break; + case MASTER_SLAVE_CFG_SLAVE_PREFERRED: + case MASTER_SLAVE_CFG_SLAVE_FORCE: + nonce &= ~BIT(4); + break; + } + + base_page |= C73_BASE_PAGE_TRANSMITTED_NONCE(nonce); + /* According to Annex 28A, set Selector to "IEEE 802.3" */ + base_page |= C73_BASE_PAGE_SELECTOR(1); + /* C73_BASE_PAGE_ACK and C73_BASE_PAGE_ECHOED_NONCE seem to have + * a life of their own, regardless of what we set them to. + */ + + return mtip_write_adv(phydev, base_page); +} + +static int mtip_an_restart(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + int err; + + err = mtip_state_reset(phydev); + if (err) + return err; + + /* Make sure AN is temporarily disabled, so that we can safely + * unlatch the previous status without losing real events + */ + err = mtip_reset_an(phydev); + if (err < 0) + return err; + + err = mtip_unlatch_an_stat(phydev); + if (err) + return err; + + err = mtip_unlatch_pcs_stat(phydev); + if (err) + return err; + + err = mtip_config_an_adv(phydev); + if (err < 0) + return err; + + err = mtip_modify_an(phydev, AN_CTRL, + MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART, + MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART); + if (err < 0) + return err; + + priv->last_an_restart = jiffies; + priv->an_restart_pending = false; + + return 0; +} + +/* The reason for deferral is that the irqpoll thread waits for the LT kthreads + * to finish with irqpoll->lock held, and AN restart also requires holding the + * irqpoll->lock. So the kthreads cannot directly restart autoneg without + * deadlocking with the irqpoll thread, they must signal to the irqpoll thread + * to do so. + */ +static void mtip_an_restart_from_lt(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + + mutex_lock(&priv->an_restart_lock); + priv->an_restart_pending = true; + mutex_unlock(&priv->an_restart_lock); +} + +static int mtip_finalize_lt(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + union phy_configure_opts opts = { + .xgkr = { + .type = XGKR_CONFIGURE_LT_DONE, + }, + }; + int err, val; + + lockdep_assert_held(&priv->lt_lock); + + if (!priv->local_tx_lt_done || !priv->remote_tx_lt_done) + return 0; + + /* Let the local state machine know we're done */ + err = mtip_modify_lt(phydev, LT_STAT, LT_STAT_RX_STATUS, + LT_STAT_RX_STATUS); + if (err < 0) { + phydev_err(phydev, "Failed to update LT_STAT: %pe\n", + ERR_PTR(err)); + return err; + } + + err = mtip_finish_lt(phydev); + if (err) + return err; + + val = mtip_read_lt(phydev, LT_STAT); + if (val < 0) + return val; + + if (!(val & LT_STAT_SIGNAL_DETECT) || (val & LT_STAT_FAIL)) { + phydev_err(phydev, + "Link training did not succeed: LT_STAT = 0x%x\n", + val); + return -ENETDOWN; + } + + return phy_configure(priv->serdes, &opts); +} + +static int mtip_tx_c72_coef_update(struct phy_device *phydev, + const struct c72_coef_update *upd, + struct c72_coef_status *stat) +{ + char upd_buf[C72_COEF_UPDATE_BUFSIZ], stat_buf[C72_COEF_STATUS_BUFSIZ]; + int err, val; + u16 ld_coef; + + c72_coef_update_print(upd, upd_buf); + + err = read_poll_timeout(mtip_read_lt, val, + val < 0 || LT_COEF_STAT_ALL_NOT_UPDATED(val), + MTIP_COEF_STAT_SLEEP_US, MTIP_COEF_STAT_TIMEOUT_US, + false, phydev, LT_LP_STAT); + if (val < 0) + return val; + if (err) { + phydev_err(phydev, + "LP did not set coefficient status to NOT_UPDATED, couldn't send %s; LP_STAT = 0x%x\n", + upd_buf, val); + return err; + } + + ld_coef = LT_COM1(upd->com1) | LT_COZ(upd->coz) | LT_COP1(upd->cop1); + if (upd->init) + ld_coef |= LT_COEF_UPD_INIT; + if (upd->preset) + ld_coef |= LT_COEF_UPD_PRESET; + + err = mtip_write_lt(phydev, LT_LD_COEF, ld_coef); + if (err < 0) + return err; + + err = read_poll_timeout(mtip_read_lt, val, + val < 0 || LT_COEF_STAT_ANY_UPDATED(val), + MTIP_COEF_STAT_SLEEP_US, MTIP_COEF_STAT_TIMEOUT_US, + false, phydev, LT_LP_STAT); + if (val < 0) + return val; + if (err) { + phydev_err(phydev, + "LP did not update coefficient status for %s; LP_STAT = 0x%x\n", + upd_buf, val); + return err; + } + + stat->com1 = LT_COM1_X(val); + stat->coz = LT_COZ_X(val); + stat->cop1 = LT_COP1_X(val); + c72_coef_status_print(stat, stat_buf); + + ld_coef = LT_COM1(COEF_UPD_HOLD) | LT_COZ(COEF_UPD_HOLD) | + LT_COP1(COEF_UPD_HOLD); + err = mtip_write_lt(phydev, LT_LD_COEF, ld_coef); + if (err < 0) + return err; + + phydev_dbg(phydev, "Sent update: %s, got status: %s\n", + upd_buf, stat_buf); + + return 0; +} + +static int mtip_c72_process_request(struct phy_device *phydev, + const struct c72_coef_update *upd, + struct c72_coef_status *stat) +{ + struct mtip_backplane *priv = phydev->priv; + union phy_configure_opts opts = { + .xgkr = { + .type = XGKR_CONFIGURE_LOCAL_TX, + .local_tx = { + .update = *upd, + }, + }, + }; + int err; + + err = phy_configure(priv->serdes, &opts); + if (err) + return err; + + *stat = opts.xgkr.local_tx.status; + + return 0; +} + +static int mtip_read_lt_lp_coef_if_not_ready(struct phy_device *phydev, + bool *rx_ready) +{ + int val; + + val = mtip_read_lt(phydev, LT_LP_STAT); + if (val < 0) + return val; + + *rx_ready = !!(val & LT_COEF_STAT_RX_READY); + if (*rx_ready) + return 0; + + return mtip_read_lt(phydev, LT_LP_COEF); +} + +static int mtip_rx_c72_coef_update(struct phy_device *phydev, + struct c72_coef_update *upd, + bool *rx_ready) +{ + char upd_buf[C72_COEF_UPDATE_BUFSIZ], stat_buf[C72_COEF_STATUS_BUFSIZ]; + struct c72_coef_status stat = {}; + int err, val; + + err = read_poll_timeout(mtip_read_lt_lp_coef_if_not_ready, + val, val < 0 || *rx_ready || LT_COEF_UPD_ANYTHING(val), + MTIP_COEF_STAT_SLEEP_US, MTIP_COEF_STAT_TIMEOUT_US, + false, phydev, rx_ready); + if (val < 0) + return val; + if (*rx_ready) { + phydev_dbg(phydev, "LP says its RX is ready\n"); + return 0; + } + if (err) { + phydev_err(phydev, + "LP did not request coefficient updates; LP_COEF = 0x%x\n", + val); + return err; + } + + upd->com1 = LT_COM1_X(val); + upd->coz = LT_COZ_X(val); + upd->cop1 = LT_COP1_X(val); + upd->init = !!(val & LT_COEF_UPD_INIT); + upd->preset = !!(val & LT_COEF_UPD_PRESET); + c72_coef_update_print(upd, upd_buf); + + if ((upd->com1 || upd->coz || upd->cop1) + upd->init + upd->preset > 1) { + phydev_warn(phydev, "Ignoring illegal request: %s (LP_COEF = 0x%x)\n", + upd_buf, val); + return 0; + } + + err = mtip_c72_process_request(phydev, upd, &stat); + if (err) + return err; + + c72_coef_status_print(&stat, stat_buf); + phydev_dbg(phydev, "Received update: %s, responded with status: %s\n", + upd_buf, stat_buf); + + err = mtip_modify_lt(phydev, LT_LD_STAT, LT_COEF_STAT_MASK, + LT_COM1(stat.com1) | LT_COZ(stat.coz) | + LT_COP1(stat.cop1)); + if (err < 0) + return err; + + err = read_poll_timeout(mtip_read_lt, val, + val < 0 || LT_COEF_UPD_NOTHING(val), + MTIP_COEF_STAT_SLEEP_US, MTIP_COEF_STAT_TIMEOUT_US, + false, phydev, LT_LP_COEF); + if (val < 0) + return val; + if (err) { + phydev_err(phydev, "LP did not revert to HOLD; LP_COEF = 0x%x\n", + val); + return err; + } + + err = mtip_modify_lt(phydev, LT_LD_STAT, LT_COEF_STAT_MASK, + LT_COM1(COEF_STAT_NOT_UPDATED) | + LT_COZ(COEF_STAT_NOT_UPDATED) | + LT_COP1(COEF_STAT_NOT_UPDATED)); + if (err < 0) + return err; + + return 0; +} + +static int mtip_local_tx_lt_done(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + int err; + + mutex_lock(&priv->lt_lock); + + priv->local_tx_lt_done = true; + + err = mtip_finalize_lt(phydev); + + mutex_unlock(&priv->lt_lock); + + return err; +} + +static int mtip_remote_tx_lt_done(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + int err; + + mutex_lock(&priv->lt_lock); + + priv->remote_tx_lt_done = true; + + err = mtip_finalize_lt(phydev); + + mutex_unlock(&priv->lt_lock); + + return err; +} + +/* This is our hardware-based 500 ms timer for the link training */ +static bool mtip_lt_in_progress(struct phy_device *phydev) +{ + int val; + + val = mtip_read_lt(phydev, LT_STAT); + if (val < 0) + return false; + + return !!(val & LT_STAT_IN_PROGRESS); +} + +/* Make adjustments to the local TX according to link partner requests, + * so that its RX improves + */ +static void mtip_local_tx_lt_work(struct kthread_work *work) +{ + struct mtip_lt_work *lt_work = container_of(work, struct mtip_lt_work, + work); + struct phy_device *phydev = lt_work->phydev; + struct mtip_backplane *priv = phydev->priv; + int err; + + err = mtip_lt_frame_lock(phydev); + if (err) { + phydev_err(phydev, + "Failed to acquire training frame delineation: %pe\n", + ERR_PTR(err)); + goto out; + } + + while (READ_ONCE(priv->lt_enabled)) { + struct c72_coef_update upd = {}; + bool rx_ready; + + if (!mtip_lt_in_progress(phydev)) { + phydev_err(phydev, "Local TX LT timed out\n"); + break; + } + + err = mtip_rx_c72_coef_update(phydev, &upd, &rx_ready); + if (err) + goto out; + + if (rx_ready) { + err = mtip_local_tx_lt_done(phydev); + if (err) { + phydev_err(phydev, "Failed to finalize local LT: %pe\n", + ERR_PTR(err)); + goto out; + } + break; + } + } + +out: + if (err && READ_ONCE(priv->lt_enabled)) + mtip_an_restart_from_lt(phydev); + + kfree(lt_work); +} + +/* Train the link partner TX, so that the local RX quality improves */ +static void mtip_remote_tx_lt_work(struct kthread_work *work) +{ + struct mtip_lt_work *lt_work = container_of(work, struct mtip_lt_work, + work); + struct phy_device *phydev = lt_work->phydev; + struct mtip_backplane *priv = phydev->priv; + int err; + + err = mtip_lt_frame_lock(phydev); + if (err) { + phydev_err(phydev, + "Failed to acquire training frame delineation: %pe\n", + ERR_PTR(err)); + goto out; + } + + while (true) { + struct c72_coef_status status = {}; + union phy_configure_opts opts = { + .xgkr = { + .type = XGKR_CONFIGURE_REMOTE_TX, + }, + }; + + if (!READ_ONCE(priv->lt_enabled)) + goto out; + + if (!mtip_lt_in_progress(phydev)) { + phydev_err(phydev, "Remote TX LT timed out\n"); + goto out; + } + + err = phy_configure(priv->serdes, &opts); + if (err) { + phydev_err(phydev, + "Failed to get remote TX training request from SerDes: %pe\n", + ERR_PTR(err)); + goto out; + } + + if (opts.xgkr.remote_tx.rx_ready) + break; + + err = mtip_tx_c72_coef_update(phydev, &opts.xgkr.remote_tx.update, + &status); + if (opts.xgkr.remote_tx.cb) + opts.xgkr.remote_tx.cb(opts.xgkr.remote_tx.cb_priv, err, + opts.xgkr.remote_tx.update, + status); + if (err) + goto out; + } + + /* Let the link partner know we're done */ + err = mtip_modify_lt(phydev, LT_LD_STAT, LT_COEF_STAT_RX_READY, + LT_COEF_STAT_RX_READY); + if (err < 0) { + phydev_err(phydev, "Failed to update LT_LD_STAT: %pe\n", + ERR_PTR(err)); + goto out; + } + + err = mtip_remote_tx_lt_done(phydev); + if (err) { + phydev_err(phydev, "Failed to finalize remote LT: %pe\n", + ERR_PTR(err)); + goto out; + } + +out: + if (err && READ_ONCE(priv->lt_enabled)) + mtip_an_restart_from_lt(phydev); + + kfree(lt_work); +} + +static int mtip_start_lt(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + struct mtip_backplane *priv = phydev->priv; + struct mtip_lt_work *remote_tx_lt_work; + struct mtip_lt_work *local_tx_lt_work; + int err; + + lockdep_assert_held(&irqpoll->lock); + + local_tx_lt_work = kzalloc(sizeof(*local_tx_lt_work), GFP_KERNEL); + if (!local_tx_lt_work) { + err = -ENOMEM; + goto out; + } + + remote_tx_lt_work = kzalloc(sizeof(*remote_tx_lt_work), GFP_KERNEL); + if (!remote_tx_lt_work) { + err = -ENOMEM; + goto out_free_local_tx_lt; + } + + err = mtip_reset_lt(phydev); + if (err) + goto out_free_remote_tx_lt; + + err = mtip_restart_lt(phydev, true); + if (err) + goto out_free_remote_tx_lt; + + priv->local_tx_lt_done = false; + priv->remote_tx_lt_done = false; + WRITE_ONCE(priv->lt_enabled, true); + + local_tx_lt_work->phydev = phydev; + kthread_init_work(&local_tx_lt_work->work, mtip_local_tx_lt_work); + kthread_queue_work(priv->local_tx_lt_worker, &local_tx_lt_work->work); + + remote_tx_lt_work->phydev = phydev; + kthread_init_work(&remote_tx_lt_work->work, mtip_remote_tx_lt_work); + kthread_queue_work(priv->remote_tx_lt_worker, &remote_tx_lt_work->work); + + phydev_dbg(phydev, "Link training enabled\n"); + + return 0; + +out_free_remote_tx_lt: + kfree(remote_tx_lt_work); +out_free_local_tx_lt: + kfree(local_tx_lt_work); +out: + return err; +} + +static void mtip_update_link_latch(struct phy_device *phydev, + bool cdr_locked, bool phy_los, + bool an_complete, bool pcs_lstat) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + struct mtip_backplane *priv = phydev->priv; + + lockdep_assert_held(&irqpoll->lock); + + /* Update irqpoll->link if true, or if false + * and mtip_read_status() saw that already. + */ + if (irqpoll->link || irqpoll->link_ack) { + irqpoll->link = phy_los && cdr_locked && an_complete && pcs_lstat; + irqpoll->link_ack = false; + } + + phydev_dbg(phydev, "PCS link%s: %d, PHY LOS: %d, CDR locked: %d, AN complete: %d\n", + priv->link_mode_resolved ? "" : " (ignored)", + pcs_lstat, phy_los, cdr_locked, an_complete); +} + +static bool mtip_cached_an_complete(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + + lockdep_assert_held(&irqpoll->lock); + + return !!(irqpoll->old_an_stat & MDIO_AN_STAT1_COMPLETE); +} + +static bool mtip_read_link_unlatch(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + bool old_link = irqpoll->link; + + lockdep_assert_held(&irqpoll->lock); + + /* A change to the link status may have occurred while a link + * loss was latched, so update it again after reading it + */ + irqpoll->link = !!(irqpoll->old_an_stat & MDIO_STAT1_LSTATUS) && + !!(irqpoll->old_an_stat & MDIO_AN_STAT1_COMPLETE) && + !!(irqpoll->old_pcs_stat & MDIO_STAT1_LSTATUS) && + irqpoll->cdr_locked; + irqpoll->link_ack = true; + + return old_link; +} + +static u16 mtip_expected_bp_eth_stat(enum ethtool_link_mode_bit_indices link_mode) +{ + switch (link_mode) { + case ETHTOOL_LINK_MODE_1000baseKX_Full_BIT: + return BP_ETH_STAT_ALWAYS_1 | BP_ETH_STAT_1GKX; + case ETHTOOL_LINK_MODE_10000baseKR_Full_BIT: + return BP_ETH_STAT_ALWAYS_1 | BP_ETH_STAT_10GKR; + case ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT: + return BP_ETH_STAT_ALWAYS_1 | BP_ETH_STAT_40GKR4; + case ETHTOOL_LINK_MODE_25000baseKR_Full_BIT: + return BP_ETH_STAT_ALWAYS_1 | BP_ETH_STAT_25GKR; + case ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT: + return BP_ETH_STAT_ALWAYS_1 | BP_ETH_STAT_100GKR4; + default: + return 0; + } +} + +static int mtip_wait_bp_eth_stat(struct phy_device *phydev, + enum ethtool_link_mode_bit_indices link_mode) +{ + u16 expected = mtip_expected_bp_eth_stat(link_mode); + int err, val; + + err = read_poll_timeout(mtip_read_an, val, + val < 0 || val == expected, + MTIP_BP_ETH_STAT_SLEEP_US, + MTIP_BP_ETH_STAT_TIMEOUT_US, + false, phydev, AN_BP_ETH_STAT); + if (val < 0) + return val; + + if (err) { + phydev_warn(phydev, + "BP_ETH_STAT did not become 0x%x to indicate resolved link mode %s, instead it shows 0x%x%s\n", + expected, ethtool_link_mode_str(link_mode), val, + val == BP_ETH_STAT_PARALLEL_DETECT ? " (parallel detection)" : ""); + /* It seems less consequential to ignore the error + * than to restart autoneg... + */ + } + + return 0; +} + +static int mtip_c73_page_received(struct phy_device *phydev, bool *restart_an) +{ + __ETHTOOL_DECLARE_LINK_MODE_MASK(lp_advertising); + __ETHTOOL_DECLARE_LINK_MODE_MASK(advertising); + enum ethtool_link_mode_bit_indices resolved; + struct mtip_backplane *priv = phydev->priv; + __ETHTOOL_DECLARE_LINK_MODE_MASK(common); + u64 base_page, lpa; + int err; + + err = mtip_state_reset(phydev); + if (err) + return err; + + err = mtip_read_adv(phydev, &base_page); + if (err < 0) + return err; + + err = mtip_read_lpa(phydev, &lpa); + if (err < 0) + return err; + + if (lpa & C73_BASE_PAGE_NP) + phydev_warn(phydev, "Next Page exchange not implemented!\n"); + + mii_c73_mod_linkmode_lpa_t(advertising, base_page); + mii_c73_mod_linkmode_lpa_t(lp_advertising, lpa); + linkmode_and(common, advertising, lp_advertising); + + err = linkmode_c73_priority_resolution(common, &resolved); + if (err) { + phydev_dbg(phydev, "C73 page received, no common link mode\n"); + return 0; + } + + err = mtip_wait_bp_eth_stat(phydev, resolved); + if (err) { + *restart_an = true; + return 0; + } + + phydev_dbg(phydev, + "C73 page received, LD %04x:%04x:%04x, LP %04x:%04x:%04x, resolved link mode %s\n", + C73_ADV_2(base_page), C73_ADV_1(base_page), C73_ADV_0(base_page), + C73_ADV_2(lpa), C73_ADV_1(lpa), C73_ADV_0(lpa), + ethtool_link_mode_str(resolved)); + + err = phy_set_mode_ext(priv->serdes, PHY_MODE_ETHERNET_PHY, resolved); + if (err) { + phydev_err(phydev, "phy_set_mode_ext(%s) returned %pe\n", + ethtool_link_mode_str(resolved), ERR_PTR(err)); + return err; + } + + err = mtip_wait_for_cdr_lock(phydev); + if (err) + phydev_warn(phydev, "Failed to reacquire CDR lock after protocol change: %pe\n", + ERR_PTR(err)); + + if (link_mode_needs_training(resolved)) { + err = mtip_start_lt(phydev); + if (err) + return err; + } else { + /* Allow the datapath to come up without link training */ + err = mtip_modify_lt(phydev, LT_STAT, LT_STAT_RX_STATUS, + LT_STAT_RX_STATUS); + if (err < 0) + return err; + } + + priv->link_mode = resolved; + priv->link_mode_resolved = true; + + return 0; +} + +static void mtip_c73_remote_fault(struct phy_device *phydev, bool fault) +{ + phydev_err(phydev, "Remote fault: %d\n", fault); +} + +static void mtip_irqpoll_work(struct work_struct *work) +{ + struct mtip_irqpoll *irqpoll = container_of(work, struct mtip_irqpoll, work.work); + struct phy_device *phydev = irqpoll->phydev; + struct mtip_backplane *priv = phydev->priv; + bool restart_an = false; + int val, err = 0; + int pcs_stat = 0; + bool cdr_locked; + + /* Check for AN restart requests from the link training kthreads */ + mutex_lock(&priv->an_restart_lock); + if (priv->an_restart_pending) { + restart_an = true; + priv->an_restart_pending = false; + } + mutex_unlock(&priv->an_restart_lock); + + /* Then enter the irqpoll logic per se + * (PCS MDIO_STAT1, AN/LT MDIO_STAT1 and CDR lock) + */ + mutex_lock(&irqpoll->lock); + + err = phy_check_cdr_lock(priv->serdes, &cdr_locked); + if (err) + goto out_unlock; + + if (priv->link_mode_resolved) { + pcs_stat = mtip_read_pcs(phydev, MDIO_STAT1); + if (pcs_stat < 0) { + err = pcs_stat; + goto out_unlock; + } + } + + val = mtip_read_an(phydev, AN_STAT); + if (val < 0) { + err = val; + goto out_unlock; + } + + if ((irqpoll->cdr_locked != cdr_locked) || + ((irqpoll->old_an_stat ^ val) & (MDIO_STAT1_LSTATUS | + MDIO_AN_STAT1_COMPLETE)) || + ((irqpoll->old_pcs_stat ^ pcs_stat) & MDIO_STAT1_LSTATUS)) { + mtip_update_link_latch(phydev, cdr_locked, + !!(val & MDIO_STAT1_LSTATUS), + !!(val & MDIO_AN_STAT1_COMPLETE), + !!(pcs_stat & MDIO_STAT1_LSTATUS)); + } + + /* The manual says that this bit is latched high, but experimentation + * shows that reads will not unlatch it while link training is in + * progress; only reading it after link training has completed will. + * Only act upon bit transitions, to avoid processing a false "page + * received" event during link training. + */ + if (((irqpoll->old_an_stat ^ val) & MDIO_AN_STAT1_PAGE) && + (val & MDIO_AN_STAT1_PAGE)) { + err = mtip_c73_page_received(phydev, &restart_an); + if (err) + goto out_unlock; + } + + if ((irqpoll->old_an_stat ^ val) & MDIO_AN_STAT1_RFAULT) + mtip_c73_remote_fault(phydev, val & MDIO_AN_STAT1_RFAULT); + + /* Checks that result in AN restart should go at the end */ + + /* Make sure the lane goes back into DME page exchange mode + * after a link drop + */ + if (priv->link_mode_resolved && + (irqpoll->old_pcs_stat & MDIO_STAT1_LSTATUS) && + !(pcs_stat & MDIO_STAT1_LSTATUS)) { + phydev_dbg(phydev, "PCS link dropped, restarting autoneg\n"); + restart_an = true; + } + + /* Paranoid workaround for undetermined issue */ + if (!priv->link_mode_resolved && (val & MDIO_AN_STAT1_COMPLETE) && + priv->an_enabled && time_after(jiffies, priv->last_an_restart + + msecs_to_jiffies(MTIP_AN_TIMEOUT_MS))) { + phydev_err(phydev, + "Hardware says AN has completed, but we never saw a base page, and that's bogus\n"); + restart_an = true; + } + + if (restart_an) { + err = mtip_an_restart(phydev); + if (err) + goto out_unlock; + + /* don't overwrite what was set by mtip_unlatch_an_stat() */ + goto ignore_an_and_pcs_stat; + } + + irqpoll->old_an_stat = val; + irqpoll->old_pcs_stat = pcs_stat; +ignore_an_and_pcs_stat: + irqpoll->cdr_locked = cdr_locked; + +out_unlock: + mutex_unlock(&irqpoll->lock); + + if (err) { + phy_error(phydev); + return; + } + + schedule_delayed_work(&irqpoll->work, IRQPOLL_INTERVAL); +} + +static int mtip_parse_dt(struct phy_device *phydev) +{ + struct device_node *dn = phydev->mdio.dev.of_node; + struct mtip_backplane *priv = phydev->priv; + struct device_node *pcs_node; + + priv->serdes = of_phy_get(dn, NULL); + if (IS_ERR(priv->serdes)) + return PTR_ERR(priv->serdes); + + pcs_node = of_parse_phandle(dn, "pcs-handle", 0); + if (pcs_node) { + if (!of_device_is_available(pcs_node)) { + phydev_err(phydev, "pcs-handle node not available\n"); + of_node_put(pcs_node); + return -ENODEV; + } + + priv->pcs = of_mdio_find_device(pcs_node); + of_node_put(pcs_node); + if (!priv->pcs) { + phydev_err(phydev, "missing PCS device\n"); + return -EPROBE_DEFER; + } + } else { + priv->pcs = &phydev->mdio; + } + + return 0; +} + +static bool mtip_is_lx2160a(struct phy_device *phydev) +{ + return of_device_is_compatible(phydev->mdio.dev.of_node, + "fsl,lx2160a-backplane-anlt"); +} + +static int mtip_lx2160a_match_phy_device(struct phy_device *phydev) +{ + return mtip_is_lx2160a(phydev); +} + +static void mtip_irqpoll_init(struct phy_device *phydev, + struct mtip_irqpoll *irqpoll) +{ + mutex_init(&irqpoll->lock); + INIT_DELAYED_WORK(&irqpoll->work, mtip_irqpoll_work); + irqpoll->phydev = phydev; +} + +static void mtip_start_irqpoll(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + + schedule_delayed_work(&irqpoll->work, 0); +} + +static void mtip_stop_irqpoll(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + + cancel_delayed_work_sync(&irqpoll->work); +} + +static int mtip_probe(struct phy_device *phydev) +{ + struct device *dev = &phydev->mdio.dev; + struct mtip_backplane *priv; + int err; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) { + err = -ENOMEM; + goto out; + } + + phydev->port = PORT_DA; + + if (mtip_is_lx2160a(phydev)) { + priv->an_regs = mtip_lx2160a_an_regs; + priv->lt_regs = mtip_lx2160a_lt_regs; + priv->lt_mmd = MDIO_MMD_AN; + } /* else TODO */ + + mtip_irqpoll_init(phydev, &priv->irqpoll); + mutex_init(&priv->an_restart_lock); + mutex_init(&priv->lt_lock); + phydev->priv = priv; + + priv->local_tx_lt_worker = kthread_create_worker(0, "%s_local_tx_lt", + dev_name(dev)); + if (IS_ERR(priv->local_tx_lt_worker)) { + err = PTR_ERR(priv->local_tx_lt_worker); + goto out_free_priv; + } + + priv->remote_tx_lt_worker = kthread_create_worker(0, "%s_remote_tx_lt", + dev_name(dev)); + if (IS_ERR(priv->remote_tx_lt_worker)) { + err = PTR_ERR(priv->remote_tx_lt_worker); + goto out_destroy_local_tx_lt; + } + + err = mtip_parse_dt(phydev); + if (err) + goto out_destroy_remote_tx_lt; + + err = phy_init(priv->serdes); + if (err) { + phydev_err(phydev, "Failed to initialize SerDes: %pe\n", + ERR_PTR(err)); + goto out_put_phy; + } + + mtip_start_irqpoll(phydev); + + return 0; + +out_put_phy: + of_phy_put(priv->serdes); +out_destroy_remote_tx_lt: + kthread_destroy_worker(priv->remote_tx_lt_worker); +out_destroy_local_tx_lt: + kthread_destroy_worker(priv->local_tx_lt_worker); +out_free_priv: + kfree(priv); +out: + return err; +} + +static void mtip_remove(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + + mtip_stop_irqpoll(phydev); + phy_exit(priv->serdes); + of_phy_put(priv->serdes); + kthread_destroy_worker(priv->remote_tx_lt_worker); + kthread_destroy_worker(priv->local_tx_lt_worker); + kfree(priv); +} + +static int mtip_config_aneg(struct phy_device *phydev) +{ + u16 mask = MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART; + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + struct mtip_backplane *priv = phydev->priv; + int err; + + mutex_lock(&irqpoll->lock); + + /* We support anything */ + phydev->master_slave_get = phydev->master_slave_set; + + /* Only allow advertising what this PHY supports. The device tree + * property "max-speed" may further limit the speed and thus the + * link modes. Similar to genphy_config_advert(). + */ + linkmode_and(phydev->advertising, phydev->advertising, + phydev->supported); + + if (phydev->autoneg == AUTONEG_ENABLE) { + err = mtip_an_restart(phydev); + if (err) + goto out_unlock; + + priv->an_enabled = true; + } else { + err = mtip_modify_an(phydev, AN_CTRL, mask, 0); + if (err < 0) + goto out_unlock; + + priv->an_enabled = false; + } + +out_unlock: + mutex_unlock(&irqpoll->lock); + + return err; +} + +static int mtip_resolve_aneg_linkmode(struct phy_device *phydev) +{ + u64 base_page; + int err; + + linkmode_zero(phydev->lp_advertising); + + err = mtip_read_lpa(phydev, &base_page); + if (err) + return err; + + mii_c73_mod_linkmode_lpa_t(phydev->lp_advertising, base_page); + phy_resolve_aneg_linkmode(phydev); + + return 0; +} + +static int mtip_read_status(struct phy_device *phydev) +{ + struct mtip_irqpoll *irqpoll = phydev_to_irqpoll(phydev); + u64 base_page; + int err = 0; + + mutex_lock(&irqpoll->lock); + + err = mtip_read_adv(phydev, &base_page); + if (err) + goto out_unlock; + + if (C73_BASE_PAGE_TRANSMITTED_NONCE_X(base_page) & BIT(4)) + phydev->master_slave_state = MASTER_SLAVE_STATE_MASTER; + else + phydev->master_slave_state = MASTER_SLAVE_STATE_SLAVE; + + phydev->speed = SPEED_UNKNOWN; + phydev->duplex = DUPLEX_UNKNOWN; + phydev->pause = 0; + phydev->asym_pause = 0; + + phydev->link = mtip_read_link_unlatch(phydev); + if (!phydev->link) + goto out_unlock; + + if (phydev->autoneg == AUTONEG_ENABLE) { + phydev->autoneg_complete = mtip_cached_an_complete(phydev); + + if (phydev->autoneg_complete) + err = mtip_resolve_aneg_linkmode(phydev); + } + +out_unlock: + mutex_unlock(&irqpoll->lock); + + return err; +} + +static int mtip_suspend(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + int err; + + err = phy_power_off(priv->serdes); + if (err) { + phydev_err(phydev, "Failed to power off SerDes: %pe\n", + ERR_PTR(err)); + return err; + } + + return 0; +} + +static int mtip_resume(struct phy_device *phydev) +{ + struct mtip_backplane *priv = phydev->priv; + int err; + + err = phy_power_on(priv->serdes); + if (err) { + phydev_err(phydev, "Failed to power on SerDes: %pe\n", + ERR_PTR(err)); + return err; + } + + return 0; +} + +static int mtip_config_init(struct phy_device *phydev) +{ + int err; + + err = mtip_reset_an(phydev); + if (err < 0) + return err; + + err = mtip_reset_pcs(phydev); + if (err < 0) + return err; + + return 0; +} + +static struct phy_driver mtip_backplane_driver[] = { + { + .match_phy_device = mtip_lx2160a_match_phy_device, + .flags = PHY_IS_INTERNAL, + .name = "MTIP AN/LT", + .probe = mtip_probe, + .remove = mtip_remove, + .get_features = mtip_lx2160a_get_features, + .suspend = mtip_suspend, + .resume = mtip_resume, + .config_aneg = mtip_config_aneg, + .read_status = mtip_read_status, + .config_init = mtip_config_init, + }, +}; + +static const struct of_device_id __maybe_unused mtip_backplane_of_match[] = { + { .compatible = "fsl,lx2160a-backplane-anlt" }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, mtip_backplane_of_match); + +module_phy_driver(mtip_backplane_driver); + +MODULE_AUTHOR("Vladimir Oltean <vladimir.oltean@xxxxxxx>"); +MODULE_DESCRIPTION("MTIP Backplane PHY driver"); +MODULE_LICENSE("GPL"); -- 2.34.1