// SPDX-License-Identifier: GPL-2.0 /* * Copyright (c) 2020 Synopsys, Inc. and/or its affiliates. * Synopsys DesignWare XPCS helpers * * Author: Jose Abreu */ #include #include #include #include #include #define SYNOPSYS_XPCS_USXGMII_ID 0x7996ced0 #define SYNOPSYS_XPCS_10GKR_ID 0x7996ced0 #define SYNOPSYS_XPCS_XLGMII_ID 0x7996ced0 #define SYNOPSYS_XPCS_MASK 0xffffffff /* Vendor regs access */ #define DW_VENDOR BIT(15) /* VR_XS_PCS */ #define DW_USXGMII_RST BIT(10) #define DW_USXGMII_EN BIT(9) #define DW_VR_XS_PCS_DIG_STS 0x0010 #define DW_RXFIFO_ERR GENMASK(6, 5) /* SR_MII */ #define DW_USXGMII_FULL BIT(8) #define DW_USXGMII_SS_MASK (BIT(13) | BIT(6) | BIT(5)) #define DW_USXGMII_10000 (BIT(13) | BIT(6)) #define DW_USXGMII_5000 (BIT(13) | BIT(5)) #define DW_USXGMII_2500 (BIT(5)) #define DW_USXGMII_1000 (BIT(6)) #define DW_USXGMII_100 (BIT(13)) #define DW_USXGMII_10 (0) /* SR_AN */ #define DW_SR_AN_ADV1 0x10 #define DW_SR_AN_ADV2 0x11 #define DW_SR_AN_ADV3 0x12 #define DW_SR_AN_LP_ABL1 0x13 #define DW_SR_AN_LP_ABL2 0x14 #define DW_SR_AN_LP_ABL3 0x15 /* Clause 73 Defines */ /* AN_LP_ABL1 */ #define DW_C73_PAUSE BIT(10) #define DW_C73_ASYM_PAUSE BIT(11) #define DW_C73_AN_ADV_SF 0x1 /* AN_LP_ABL2 */ #define DW_C73_1000KX BIT(5) #define DW_C73_10000KX4 BIT(6) #define DW_C73_10000KR BIT(7) /* AN_LP_ABL3 */ #define DW_C73_2500KX BIT(0) #define DW_C73_5000KR BIT(1) static const int xpcs_usxgmii_features[] = { ETHTOOL_LINK_MODE_Pause_BIT, ETHTOOL_LINK_MODE_Asym_Pause_BIT, ETHTOOL_LINK_MODE_Autoneg_BIT, ETHTOOL_LINK_MODE_1000baseKX_Full_BIT, ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT, ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, ETHTOOL_LINK_MODE_2500baseX_Full_BIT, __ETHTOOL_LINK_MODE_MASK_NBITS, }; static const int xpcs_10gkr_features[] = { ETHTOOL_LINK_MODE_Pause_BIT, ETHTOOL_LINK_MODE_Asym_Pause_BIT, ETHTOOL_LINK_MODE_10000baseKR_Full_BIT, __ETHTOOL_LINK_MODE_MASK_NBITS, }; static const int xpcs_xlgmii_features[] = { ETHTOOL_LINK_MODE_Pause_BIT, ETHTOOL_LINK_MODE_Asym_Pause_BIT, ETHTOOL_LINK_MODE_25000baseCR_Full_BIT, ETHTOOL_LINK_MODE_25000baseKR_Full_BIT, ETHTOOL_LINK_MODE_25000baseSR_Full_BIT, ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT, ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT, ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT, ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT, ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT, ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT, ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT, ETHTOOL_LINK_MODE_50000baseKR_Full_BIT, ETHTOOL_LINK_MODE_50000baseSR_Full_BIT, ETHTOOL_LINK_MODE_50000baseCR_Full_BIT, ETHTOOL_LINK_MODE_50000baseLR_ER_FR_Full_BIT, ETHTOOL_LINK_MODE_50000baseDR_Full_BIT, ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT, ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT, ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT, ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT, ETHTOOL_LINK_MODE_100000baseKR2_Full_BIT, ETHTOOL_LINK_MODE_100000baseSR2_Full_BIT, ETHTOOL_LINK_MODE_100000baseCR2_Full_BIT, ETHTOOL_LINK_MODE_100000baseLR2_ER2_FR2_Full_BIT, ETHTOOL_LINK_MODE_100000baseDR2_Full_BIT, __ETHTOOL_LINK_MODE_MASK_NBITS, }; static const phy_interface_t xpcs_usxgmii_interfaces[] = { PHY_INTERFACE_MODE_USXGMII, PHY_INTERFACE_MODE_MAX, }; static const phy_interface_t xpcs_10gkr_interfaces[] = { PHY_INTERFACE_MODE_10GKR, PHY_INTERFACE_MODE_MAX, }; static const phy_interface_t xpcs_xlgmii_interfaces[] = { PHY_INTERFACE_MODE_XLGMII, PHY_INTERFACE_MODE_MAX, }; static struct xpcs_id { u32 id; u32 mask; const int *supported; const phy_interface_t *interface; } xpcs_id_list[] = { { .id = SYNOPSYS_XPCS_USXGMII_ID, .mask = SYNOPSYS_XPCS_MASK, .supported = xpcs_usxgmii_features, .interface = xpcs_usxgmii_interfaces, }, { .id = SYNOPSYS_XPCS_10GKR_ID, .mask = SYNOPSYS_XPCS_MASK, .supported = xpcs_10gkr_features, .interface = xpcs_10gkr_interfaces, }, { .id = SYNOPSYS_XPCS_XLGMII_ID, .mask = SYNOPSYS_XPCS_MASK, .supported = xpcs_xlgmii_features, .interface = xpcs_xlgmii_interfaces, }, }; static int xpcs_read(struct mdio_xpcs_args *xpcs, int dev, u32 reg) { u32 reg_addr = MII_ADDR_C45 | dev << 16 | reg; return mdiobus_read(xpcs->bus, xpcs->addr, reg_addr); } static int xpcs_write(struct mdio_xpcs_args *xpcs, int dev, u32 reg, u16 val) { u32 reg_addr = MII_ADDR_C45 | dev << 16 | reg; return mdiobus_write(xpcs->bus, xpcs->addr, reg_addr, val); } static int xpcs_read_vendor(struct mdio_xpcs_args *xpcs, int dev, u32 reg) { return xpcs_read(xpcs, dev, DW_VENDOR | reg); } static int xpcs_write_vendor(struct mdio_xpcs_args *xpcs, int dev, int reg, u16 val) { return xpcs_write(xpcs, dev, DW_VENDOR | reg, val); } static int xpcs_read_vpcs(struct mdio_xpcs_args *xpcs, int reg) { return xpcs_read_vendor(xpcs, MDIO_MMD_PCS, reg); } static int xpcs_write_vpcs(struct mdio_xpcs_args *xpcs, int reg, u16 val) { return xpcs_write_vendor(xpcs, MDIO_MMD_PCS, reg, val); } static int xpcs_poll_reset(struct mdio_xpcs_args *xpcs, int dev) { /* Poll until the reset bit clears (50ms per retry == 0.6 sec) */ unsigned int retries = 12; int ret; do { msleep(50); ret = xpcs_read(xpcs, dev, MDIO_CTRL1); if (ret < 0) return ret; } while (ret & MDIO_CTRL1_RESET && --retries); return (ret & MDIO_CTRL1_RESET) ? -ETIMEDOUT : 0; } static int xpcs_soft_reset(struct mdio_xpcs_args *xpcs, int dev) { int ret; ret = xpcs_write(xpcs, dev, MDIO_CTRL1, MDIO_CTRL1_RESET); if (ret < 0) return ret; return xpcs_poll_reset(xpcs, dev); } #define xpcs_warn(__xpcs, __state, __args...) \ ({ \ if ((__state)->link) \ dev_warn(&(__xpcs)->bus->dev, ##__args); \ }) static int xpcs_read_fault(struct mdio_xpcs_args *xpcs, struct phylink_link_state *state) { int ret; ret = xpcs_read(xpcs, MDIO_MMD_PCS, MDIO_STAT1); if (ret < 0) return ret; if (ret & MDIO_STAT1_FAULT) { xpcs_warn(xpcs, state, "Link fault condition detected!\n"); return -EFAULT; } ret = xpcs_read(xpcs, MDIO_MMD_PCS, MDIO_STAT2); if (ret < 0) return ret; if (ret & MDIO_STAT2_RXFAULT) xpcs_warn(xpcs, state, "Receiver fault detected!\n"); if (ret & MDIO_STAT2_TXFAULT) xpcs_warn(xpcs, state, "Transmitter fault detected!\n"); ret = xpcs_read_vendor(xpcs, MDIO_MMD_PCS, DW_VR_XS_PCS_DIG_STS); if (ret < 0) return ret; if (ret & DW_RXFIFO_ERR) { xpcs_warn(xpcs, state, "FIFO fault condition detected!\n"); return -EFAULT; } ret = xpcs_read(xpcs, MDIO_MMD_PCS, MDIO_PCS_10GBRT_STAT1); if (ret < 0) return ret; if (!(ret & MDIO_PCS_10GBRT_STAT1_BLKLK)) xpcs_warn(xpcs, state, "Link is not locked!\n"); ret = xpcs_read(xpcs, MDIO_MMD_PCS, MDIO_PCS_10GBRT_STAT2); if (ret < 0) return ret; if (ret & MDIO_PCS_10GBRT_STAT2_ERR) xpcs_warn(xpcs, state, "Link has errors!\n"); return 0; } static int xpcs_read_link(struct mdio_xpcs_args *xpcs, bool an) { bool link = true; int ret; ret = xpcs_read(xpcs, MDIO_MMD_PCS, MDIO_STAT1); if (ret < 0) return ret; if (!(ret & MDIO_STAT1_LSTATUS)) link = false; if (an) { ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_STAT1); if (ret < 0) return ret; if (!(ret & MDIO_STAT1_LSTATUS)) link = false; } return link; } static int xpcs_get_max_usxgmii_speed(const unsigned long *supported) { int max = SPEED_UNKNOWN; if (phylink_test(supported, 1000baseKX_Full)) max = SPEED_1000; if (phylink_test(supported, 2500baseX_Full)) max = SPEED_2500; if (phylink_test(supported, 10000baseKX4_Full)) max = SPEED_10000; if (phylink_test(supported, 10000baseKR_Full)) max = SPEED_10000; return max; } static int xpcs_config_usxgmii(struct mdio_xpcs_args *xpcs, int speed) { int ret, speed_sel; switch (speed) { case SPEED_10: speed_sel = DW_USXGMII_10; break; case SPEED_100: speed_sel = DW_USXGMII_100; break; case SPEED_1000: speed_sel = DW_USXGMII_1000; break; case SPEED_2500: speed_sel = DW_USXGMII_2500; break; case SPEED_5000: speed_sel = DW_USXGMII_5000; break; case SPEED_10000: speed_sel = DW_USXGMII_10000; break; default: /* Nothing to do here */ return -EINVAL; } ret = xpcs_read_vpcs(xpcs, MDIO_CTRL1); if (ret < 0) return ret; ret = xpcs_write_vpcs(xpcs, MDIO_CTRL1, ret | DW_USXGMII_EN); if (ret < 0) return ret; ret = xpcs_read(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1); if (ret < 0) return ret; ret &= ~DW_USXGMII_SS_MASK; ret |= speed_sel | DW_USXGMII_FULL; ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, ret); if (ret < 0) return ret; ret = xpcs_read_vpcs(xpcs, MDIO_CTRL1); if (ret < 0) return ret; return xpcs_write_vpcs(xpcs, MDIO_CTRL1, ret | DW_USXGMII_RST); } static int xpcs_config_aneg_c73(struct mdio_xpcs_args *xpcs) { int ret, adv; /* By default, in USXGMII mode XPCS operates at 10G baud and * replicates data to achieve lower speeds. Hereby, in this * default configuration we need to advertise all supported * modes and not only the ones we want to use. */ /* SR_AN_ADV3 */ adv = 0; if (phylink_test(xpcs->supported, 2500baseX_Full)) adv |= DW_C73_2500KX; /* TODO: 5000baseKR */ ret = xpcs_write(xpcs, MDIO_MMD_AN, DW_SR_AN_ADV3, adv); if (ret < 0) return ret; /* SR_AN_ADV2 */ adv = 0; if (phylink_test(xpcs->supported, 1000baseKX_Full)) adv |= DW_C73_1000KX; if (phylink_test(xpcs->supported, 10000baseKX4_Full)) adv |= DW_C73_10000KX4; if (phylink_test(xpcs->supported, 10000baseKR_Full)) adv |= DW_C73_10000KR; ret = xpcs_write(xpcs, MDIO_MMD_AN, DW_SR_AN_ADV2, adv); if (ret < 0) return ret; /* SR_AN_ADV1 */ adv = DW_C73_AN_ADV_SF; if (phylink_test(xpcs->supported, Pause)) adv |= DW_C73_PAUSE; if (phylink_test(xpcs->supported, Asym_Pause)) adv |= DW_C73_ASYM_PAUSE; return xpcs_write(xpcs, MDIO_MMD_AN, DW_SR_AN_ADV1, adv); } static int xpcs_config_aneg(struct mdio_xpcs_args *xpcs) { int ret; ret = xpcs_config_aneg_c73(xpcs); if (ret < 0) return ret; ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_CTRL1); if (ret < 0) return ret; ret |= MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART; return xpcs_write(xpcs, MDIO_MMD_AN, MDIO_CTRL1, ret); } static int xpcs_aneg_done(struct mdio_xpcs_args *xpcs, struct phylink_link_state *state) { int ret; ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_STAT1); if (ret < 0) return ret; if (ret & MDIO_AN_STAT1_COMPLETE) { ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL1); if (ret < 0) return ret; /* Check if Aneg outcome is valid */ if (!(ret & DW_C73_AN_ADV_SF)) return 0; return 1; } return 0; } static int xpcs_read_lpa(struct mdio_xpcs_args *xpcs, struct phylink_link_state *state) { int ret; ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_STAT1); if (ret < 0) return ret; if (!(ret & MDIO_AN_STAT1_LPABLE)) { phylink_clear(state->lp_advertising, Autoneg); return 0; } phylink_set(state->lp_advertising, Autoneg); /* Clause 73 outcome */ ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL3); if (ret < 0) return ret; if (ret & DW_C73_2500KX) phylink_set(state->lp_advertising, 2500baseX_Full); ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL2); if (ret < 0) return ret; if (ret & DW_C73_1000KX) phylink_set(state->lp_advertising, 1000baseKX_Full); if (ret & DW_C73_10000KX4) phylink_set(state->lp_advertising, 10000baseKX4_Full); if (ret & DW_C73_10000KR) phylink_set(state->lp_advertising, 10000baseKR_Full); ret = xpcs_read(xpcs, MDIO_MMD_AN, DW_SR_AN_LP_ABL1); if (ret < 0) return ret; if (ret & DW_C73_PAUSE) phylink_set(state->lp_advertising, Pause); if (ret & DW_C73_ASYM_PAUSE) phylink_set(state->lp_advertising, Asym_Pause); linkmode_and(state->lp_advertising, state->lp_advertising, state->advertising); return 0; } static void xpcs_resolve_lpa(struct mdio_xpcs_args *xpcs, struct phylink_link_state *state) { int max_speed = xpcs_get_max_usxgmii_speed(state->lp_advertising); state->pause = MLO_PAUSE_TX | MLO_PAUSE_RX; state->speed = max_speed; state->duplex = DUPLEX_FULL; } static int xpcs_get_max_xlgmii_speed(struct mdio_xpcs_args *xpcs, struct phylink_link_state *state) { unsigned long *adv = state->advertising; int speed = SPEED_UNKNOWN; int bit; for_each_set_bit(bit, adv, __ETHTOOL_LINK_MODE_MASK_NBITS) { int new_speed = SPEED_UNKNOWN; switch (bit) { case ETHTOOL_LINK_MODE_25000baseCR_Full_BIT: case ETHTOOL_LINK_MODE_25000baseKR_Full_BIT: case ETHTOOL_LINK_MODE_25000baseSR_Full_BIT: new_speed = SPEED_25000; break; case ETHTOOL_LINK_MODE_40000baseKR4_Full_BIT: case ETHTOOL_LINK_MODE_40000baseCR4_Full_BIT: case ETHTOOL_LINK_MODE_40000baseSR4_Full_BIT: case ETHTOOL_LINK_MODE_40000baseLR4_Full_BIT: new_speed = SPEED_40000; break; case ETHTOOL_LINK_MODE_50000baseCR2_Full_BIT: case ETHTOOL_LINK_MODE_50000baseKR2_Full_BIT: case ETHTOOL_LINK_MODE_50000baseSR2_Full_BIT: case ETHTOOL_LINK_MODE_50000baseKR_Full_BIT: case ETHTOOL_LINK_MODE_50000baseSR_Full_BIT: case ETHTOOL_LINK_MODE_50000baseCR_Full_BIT: case ETHTOOL_LINK_MODE_50000baseLR_ER_FR_Full_BIT: case ETHTOOL_LINK_MODE_50000baseDR_Full_BIT: new_speed = SPEED_50000; break; case ETHTOOL_LINK_MODE_100000baseKR4_Full_BIT: case ETHTOOL_LINK_MODE_100000baseSR4_Full_BIT: case ETHTOOL_LINK_MODE_100000baseCR4_Full_BIT: case ETHTOOL_LINK_MODE_100000baseLR4_ER4_Full_BIT: case ETHTOOL_LINK_MODE_100000baseKR2_Full_BIT: case ETHTOOL_LINK_MODE_100000baseSR2_Full_BIT: case ETHTOOL_LINK_MODE_100000baseCR2_Full_BIT: case ETHTOOL_LINK_MODE_100000baseLR2_ER2_FR2_Full_BIT: case ETHTOOL_LINK_MODE_100000baseDR2_Full_BIT: new_speed = SPEED_100000; break; default: continue; } if (new_speed > speed) speed = new_speed; } return speed; } static void xpcs_resolve_pma(struct mdio_xpcs_args *xpcs, struct phylink_link_state *state) { state->pause = MLO_PAUSE_TX | MLO_PAUSE_RX; state->duplex = DUPLEX_FULL; switch (state->interface) { case PHY_INTERFACE_MODE_10GKR: state->speed = SPEED_10000; break; case PHY_INTERFACE_MODE_XLGMII: state->speed = xpcs_get_max_xlgmii_speed(xpcs, state); break; default: state->speed = SPEED_UNKNOWN; break; } } static int xpcs_validate(struct mdio_xpcs_args *xpcs, unsigned long *supported, struct phylink_link_state *state) { linkmode_and(supported, supported, xpcs->supported); linkmode_and(state->advertising, state->advertising, xpcs->supported); return 0; } static int xpcs_config(struct mdio_xpcs_args *xpcs, const struct phylink_link_state *state) { int ret; if (state->an_enabled) { ret = xpcs_config_aneg(xpcs); if (ret) return ret; } return 0; } static int xpcs_get_state(struct mdio_xpcs_args *xpcs, struct phylink_link_state *state) { int ret; /* Link needs to be read first ... */ state->link = xpcs_read_link(xpcs, state->an_enabled) > 0 ? 1 : 0; /* ... and then we check the faults. */ ret = xpcs_read_fault(xpcs, state); if (ret) { ret = xpcs_soft_reset(xpcs, MDIO_MMD_PCS); if (ret) return ret; state->link = 0; return xpcs_config(xpcs, state); } if (state->link && state->an_enabled && xpcs_aneg_done(xpcs, state)) { state->an_complete = true; xpcs_read_lpa(xpcs, state); xpcs_resolve_lpa(xpcs, state); } else if (state->link) { xpcs_resolve_pma(xpcs, state); } return 0; } static int xpcs_link_up(struct mdio_xpcs_args *xpcs, int speed, phy_interface_t interface) { if (interface == PHY_INTERFACE_MODE_USXGMII) return xpcs_config_usxgmii(xpcs, speed); return 0; } static u32 xpcs_get_id(struct mdio_xpcs_args *xpcs) { int ret; u32 id; ret = xpcs_read(xpcs, MDIO_MMD_PCS, MII_PHYSID1); if (ret < 0) return 0xffffffff; id = ret << 16; ret = xpcs_read(xpcs, MDIO_MMD_PCS, MII_PHYSID2); if (ret < 0) return 0xffffffff; return id | ret; } static bool xpcs_check_features(struct mdio_xpcs_args *xpcs, struct xpcs_id *match, phy_interface_t interface) { int i; for (i = 0; match->interface[i] != PHY_INTERFACE_MODE_MAX; i++) { if (match->interface[i] == interface) break; } if (match->interface[i] == PHY_INTERFACE_MODE_MAX) return false; for (i = 0; match->supported[i] != __ETHTOOL_LINK_MODE_MASK_NBITS; i++) set_bit(match->supported[i], xpcs->supported); return true; } static int xpcs_probe(struct mdio_xpcs_args *xpcs, phy_interface_t interface) { u32 xpcs_id = xpcs_get_id(xpcs); struct xpcs_id *match = NULL; int i; for (i = 0; i < ARRAY_SIZE(xpcs_id_list); i++) { struct xpcs_id *entry = &xpcs_id_list[i]; if ((xpcs_id & entry->mask) == entry->id) { match = entry; if (xpcs_check_features(xpcs, match, interface)) return 0; } } return -ENODEV; } static struct mdio_xpcs_ops xpcs_ops = { .validate = xpcs_validate, .config = xpcs_config, .get_state = xpcs_get_state, .link_up = xpcs_link_up, .probe = xpcs_probe, }; struct mdio_xpcs_ops *mdio_xpcs_get_ops(void) { return &xpcs_ops; } EXPORT_SYMBOL_GPL(mdio_xpcs_get_ops); MODULE_LICENSE("GPL v2");