From patchwork Thu Feb 1 21:53:06 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Golle X-Patchwork-Id: 13541843 Date: Thu, 1 Feb 2024 21:53:06 +0000 From: Daniel Golle To: Bc-bocun Chen , Chunfeng Yun , Vinod Koul , Kishon Vijay Abraham I , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Daniel Golle , Qingfang Deng , SkyLake Huang , Matthias Brugger , AngeloGioacchino Del Regno , Philipp Zabel , linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH 2/2] phy: add driver for MediaTek XFI T-PHY Message-ID: References: <702afb0c1246d95c90b22e57105304028bdd3083.1706823233.git.daniel@makrotopia.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <702afb0c1246d95c90b22e57105304028bdd3083.1706823233.git.daniel@makrotopia.org> List-Id: Linux Phy Mailing list Add driver for MediaTek's XFI T-PHY, 10 Gigabit/s Ethernet SerDes PHY which can be found in the MT7988 SoC. The PHY can operates only in PHY_MODE_ETHERNET, the submode is one of PHY_INTERFACE_MODE_* corresponding to the supported modes: * USXGMII \ * 10GBase-R }- USXGMII PCS - XGDM \ * 5GBase-R / \ }- Ethernet MAC * 2500Base-X \ / * 1000Base-X }- LynxI PCS - GDM / * Cisco SGMII (MAC side) / In order to work-around a performance issue present on the first of two XFI T-PHYs present in MT7988, special tuning is applied which can be selected by adding the 'mediatek,usxgmii-performance-errata' property to the device tree node. There is no documentation for most registers used for the analog/tuning part, however, most of the registers have been partially reverse-engineered from MediaTek's SDK implementation (an opaque sequence of 32-bit register writes) and descriptions for all relevant digital registers and bits such as resets and muxes have been supplied by MediaTek. Signed-off-by: Daniel Golle --- MAINTAINERS | 1 + drivers/phy/mediatek/Kconfig | 12 + drivers/phy/mediatek/Makefile | 1 + drivers/phy/mediatek/phy-mtk-xfi-tphy.c | 392 ++++++++++++++++++++++++ 4 files changed, 406 insertions(+) create mode 100644 drivers/phy/mediatek/phy-mtk-xfi-tphy.c --- a/drivers/phy/mediatek/Kconfig +++ b/drivers/phy/mediatek/Kconfig @@ -13,6 +13,18 @@ config PHY_MTK_PCIE callback for PCIe GEN3 port, it supports software efuse initialization. +config PHY_MTK_XFI_TPHY + tristate "MediaTek XFI T-PHY Driver" + depends on ARCH_MEDIATEK || COMPILE_TEST + depends on OF && OF_ADDRESS + depends on HAS_IOMEM + select GENERIC_PHY + help + Say 'Y' here to add support for MediaTek XFI T-PHY driver. + The driver provides access to the Ethernet SerDes T-PHY supporting + 1GE and 2.5GE modes via the LynxI PCS, and 5GE and 10GE modes + via the USXGMII PCS found in MediaTek SoCs with 10G Ethernet. + config PHY_MTK_TPHY tristate "MediaTek T-PHY Driver" depends on ARCH_MEDIATEK || COMPILE_TEST --- a/drivers/phy/mediatek/Makefile +++ b/drivers/phy/mediatek/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_PHY_MTK_PCIE) += phy-mtk-p obj-$(CONFIG_PHY_MTK_TPHY) += phy-mtk-tphy.o obj-$(CONFIG_PHY_MTK_UFS) += phy-mtk-ufs.o obj-$(CONFIG_PHY_MTK_XSPHY) += phy-mtk-xsphy.o +obj-$(CONFIG_PHY_MTK_XFI_TPHY) += phy-mtk-xfi-tphy.o phy-mtk-hdmi-drv-y := phy-mtk-hdmi.o phy-mtk-hdmi-drv-y += phy-mtk-hdmi-mt2701.o --- /dev/null +++ b/drivers/phy/mediatek/phy-mtk-xfi-tphy.c @@ -0,0 +1,393 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* MediaTek 10GE SerDes PHY driver + * + * Copyright (c) 2024 Daniel Golle + * Bc-bocun Chen + * based on mtk_usxgmii.c found in MediaTek's SDK released under GPL-2.0 + * Copyright (c) 2022 MediaTek Inc. + * Author: Henry Yen + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MTK_XFI_TPHY_NUM_CLOCKS 2 + +#define REG_DIG_GLB_70 0x0070 +#define XTP_PCS_RX_EQ_IN_PROGRESS(x) FIELD_PREP(GENMASK(25, 24), (x)) +#define XTP_PCS_MODE_MASK GENMASK(17, 16) +#define XTP_PCS_MODE(x) FIELD_PREP(GENMASK(17, 16), (x)) +#define XTP_PCS_RST_B BIT(15) +#define XTP_FRC_PCS_RST_B BIT(14) +#define XTP_PCS_PWD_SYNC_MASK GENMASK(13, 12) +#define XTP_PCS_PWD_SYNC(x) FIELD_PREP(XTP_PCS_PWD_SYNC_MASK, (x)) +#define XTP_PCS_PWD_ASYNC_MASK GENMASK(11, 10) +#define XTP_PCS_PWD_ASYNC(x) FIELD_PREP(XTP_PCS_PWD_ASYNC_MASK, (x)) +#define XTP_FRC_PCS_PWD_ASYNC BIT(8) +#define XTP_PCS_UPDT BIT(4) +#define XTP_PCS_IN_FR_RG BIT(0) + +#define REG_DIG_GLB_F4 0x00f4 +#define XFI_DPHY_PCS_SEL BIT(0) +#define XFI_DPHY_PCS_SEL_SGMII FIELD_PREP(XFI_DPHY_PCS_SEL, 1) +#define XFI_DPHY_PCS_SEL_USXGMII FIELD_PREP(XFI_DPHY_PCS_SEL, 0) +#define XFI_DPHY_AD_SGDT_FRC_EN BIT(5) + +#define REG_DIG_LN_TRX_40 0x3040 +#define XTP_LN_FRC_TX_DATA_EN BIT(29) +#define XTP_LN_TX_DATA_EN BIT(28) + +#define REG_DIG_LN_TRX_B0 0x30b0 +#define XTP_LN_FRC_TX_MACCK_EN BIT(5) +#define XTP_LN_TX_MACCK_EN BIT(4) + +#define REG_ANA_GLB_D0 0x90d0 +#define XTP_GLB_USXGMII_SEL_MASK GENMASK(3, 1) +#define XTP_GLB_USXGMII_SEL(x) FIELD_PREP(GENMASK(3, 1), (x)) +#define XTP_GLB_USXGMII_EN BIT(0) + +struct mtk_xfi_tphy { + void __iomem *base; + struct device *dev; + struct reset_control *reset; + struct clk_bulk_data clocks[MTK_XFI_TPHY_NUM_CLOCKS]; + bool da_war; +}; + +static void mtk_xfi_tphy_write(struct mtk_xfi_tphy *xfi_tphy, u16 reg, + u32 value) +{ + iowrite32(value, xfi_tphy->base + reg); +} + +static void mtk_xfi_tphy_rmw(struct mtk_xfi_tphy *xfi_tphy, u16 reg, + u32 clr, u32 set) +{ + u32 val; + + val = ioread32(xfi_tphy->base + reg); + val &= ~clr; + val |= set; + iowrite32(val, xfi_tphy->base + reg); +} + +static void mtk_xfi_tphy_set(struct mtk_xfi_tphy *xfi_tphy, u16 reg, + u32 set) +{ + mtk_xfi_tphy_rmw(xfi_tphy, reg, 0, set); +} + +static void mtk_xfi_tphy_clear(struct mtk_xfi_tphy *xfi_tphy, u16 reg, + u32 clr) +{ + mtk_xfi_tphy_rmw(xfi_tphy, reg, clr, 0); +} + +static void mtk_xfi_tphy_setup(struct mtk_xfi_tphy *xfi_tphy, + phy_interface_t interface) +{ + bool is_2p5g = (interface == PHY_INTERFACE_MODE_2500BASEX); + bool is_1g = (interface == PHY_INTERFACE_MODE_1000BASEX || + interface == PHY_INTERFACE_MODE_SGMII); + bool is_10g = (interface == PHY_INTERFACE_MODE_10GBASER || + interface == PHY_INTERFACE_MODE_USXGMII); + bool is_5g = (interface == PHY_INTERFACE_MODE_5GBASER); + bool is_xgmii = (is_10g || is_5g); + + dev_dbg(xfi_tphy->dev, "setting up for mode %s\n", phy_modes(interface)); + + /* Setup PLL setting */ + mtk_xfi_tphy_rmw(xfi_tphy, 0x9024, 0x100000, is_10g ? 0x0 : 0x100000); + mtk_xfi_tphy_rmw(xfi_tphy, 0x2020, 0x202000, is_5g ? 0x202000 : 0x0); + mtk_xfi_tphy_rmw(xfi_tphy, 0x2030, 0x500, is_1g ? 0x0 : 0x500); + mtk_xfi_tphy_rmw(xfi_tphy, 0x2034, 0xa00, is_1g ? 0x0 : 0xa00); + mtk_xfi_tphy_rmw(xfi_tphy, 0x2040, 0x340000, is_1g ? 0x200000 : + 0x140000); + + /* Setup RXFE BW setting */ + mtk_xfi_tphy_rmw(xfi_tphy, 0x50f0, 0xc10, is_1g ? 0x410 : + is_5g ? 0x800 : 0x400); + mtk_xfi_tphy_rmw(xfi_tphy, 0x50e0, 0x4000, is_5g ? 0x0 : 0x4000); + + /* Setup RX CDR setting */ + mtk_xfi_tphy_rmw(xfi_tphy, 0x506c, 0x30000, is_5g ? 0x0 : 0x30000); + mtk_xfi_tphy_rmw(xfi_tphy, 0x5070, 0x670000, is_5g ? 0x620000 : 0x50000); + mtk_xfi_tphy_rmw(xfi_tphy, 0x5074, 0x180000, is_5g ? 0x180000 : 0x0); + mtk_xfi_tphy_rmw(xfi_tphy, 0x5078, 0xf000400, is_5g ? 0x8000000 : + 0x7000400); + mtk_xfi_tphy_rmw(xfi_tphy, 0x507c, 0x5000500, is_5g ? 0x4000400 : + 0x1000100); + mtk_xfi_tphy_rmw(xfi_tphy, 0x5080, 0x1410, is_1g ? 0x400 : + is_5g ? 0x1010 : 0x0); + mtk_xfi_tphy_rmw(xfi_tphy, 0x5084, 0x30300, is_1g ? 0x30300 : + is_5g ? 0x30100 : + 0x100); + mtk_xfi_tphy_rmw(xfi_tphy, 0x5088, 0x60200, is_1g ? 0x20200 : + is_5g ? 0x40000 : + 0x20000); + + /* Setting RXFE adaptation range setting */ + mtk_xfi_tphy_rmw(xfi_tphy, 0x50e4, 0xc0000, is_5g ? 0x0 : 0xc0000); + mtk_xfi_tphy_rmw(xfi_tphy, 0x50e8, 0x40000, is_5g ? 0x0 : 0x40000); + mtk_xfi_tphy_rmw(xfi_tphy, 0x50ec, 0xa00, is_1g ? 0x200 : 0x800); + mtk_xfi_tphy_rmw(xfi_tphy, 0x50a8, 0xee0000, is_5g ? 0x800000 : + 0x6e0000); + mtk_xfi_tphy_rmw(xfi_tphy, 0x6004, 0x190000, is_5g ? 0x0 : 0x190000); + if (is_10g) + mtk_xfi_tphy_write(xfi_tphy, 0x00f8, 0x01423342); + else if (is_5g) + mtk_xfi_tphy_write(xfi_tphy, 0x00f8, 0x00a132a1); + else if (is_2p5g) + mtk_xfi_tphy_write(xfi_tphy, 0x00f8, 0x009c329c); + else + mtk_xfi_tphy_write(xfi_tphy, 0x00f8, 0x00fa32fa); + + /* Force SGDT_OUT off and select PCS */ + mtk_xfi_tphy_rmw(xfi_tphy, REG_DIG_GLB_F4, + XFI_DPHY_AD_SGDT_FRC_EN | XFI_DPHY_PCS_SEL, + XFI_DPHY_AD_SGDT_FRC_EN | + (is_xgmii ? XFI_DPHY_PCS_SEL_USXGMII : + XFI_DPHY_PCS_SEL_SGMII)); + + + /* Force GLB_CKDET_OUT */ + mtk_xfi_tphy_set(xfi_tphy, 0x0030, 0xc00); + + /* Force AEQ on */ + mtk_xfi_tphy_write(xfi_tphy, REG_DIG_GLB_70, + XTP_PCS_RX_EQ_IN_PROGRESS(2) | + XTP_PCS_PWD_SYNC(2) | + XTP_PCS_PWD_ASYNC(2)); + + usleep_range(1, 5); + writel(XTP_LN_FRC_TX_DATA_EN, xfi_tphy->base + REG_DIG_LN_TRX_40); + + /* Setup TX DA default value */ + mtk_xfi_tphy_rmw(xfi_tphy, 0x30b0, 0x30, 0x20); + mtk_xfi_tphy_write(xfi_tphy, 0x3028, 0x00008a01); + mtk_xfi_tphy_write(xfi_tphy, 0x302c, 0x0000a884); + mtk_xfi_tphy_write(xfi_tphy, 0x3024, 0x00083002); + + /* Setup RG default value */ + if (is_xgmii) { + mtk_xfi_tphy_write(xfi_tphy, 0x3010, 0x00022220); + mtk_xfi_tphy_write(xfi_tphy, 0x5064, 0x0f020a01); + mtk_xfi_tphy_write(xfi_tphy, 0x50b4, 0x06100600); + if (interface == PHY_INTERFACE_MODE_USXGMII) + mtk_xfi_tphy_write(xfi_tphy, 0x3048, 0x40704000); + else + mtk_xfi_tphy_write(xfi_tphy, 0x3048, 0x47684100); + } else { + mtk_xfi_tphy_write(xfi_tphy, 0x3010, 0x00011110); + mtk_xfi_tphy_write(xfi_tphy, 0x3048, 0x40704000); + } + + if (is_1g) + mtk_xfi_tphy_write(xfi_tphy, 0x3064, 0x0000c000); + + /* Setup RX EQ initial value */ + mtk_xfi_tphy_rmw(xfi_tphy, 0x3050, 0xa8000000, + (interface != PHY_INTERFACE_MODE_10GBASER) ? + 0xa8000000 : 0x0); + mtk_xfi_tphy_rmw(xfi_tphy, 0x3054, 0xaa, + (interface != PHY_INTERFACE_MODE_10GBASER) ? + 0xaa : 0x0); + + if (is_xgmii) + mtk_xfi_tphy_write(xfi_tphy, 0x306c, 0x00000f00); + else if (is_2p5g) + mtk_xfi_tphy_write(xfi_tphy, 0x306c, 0x22000f00); + else + mtk_xfi_tphy_write(xfi_tphy, 0x306c, 0x20200f00); + + if (interface == PHY_INTERFACE_MODE_10GBASER && xfi_tphy->da_war) + mtk_xfi_tphy_rmw(xfi_tphy, 0xa008, 0x10000, 0x10000); + + mtk_xfi_tphy_rmw(xfi_tphy, 0xa060, 0x50000, is_xgmii ? 0x40000 : + 0x50000); + + /* Setup PHYA speed */ + mtk_xfi_tphy_rmw(xfi_tphy, REG_ANA_GLB_D0, + XTP_GLB_USXGMII_SEL_MASK | XTP_GLB_USXGMII_EN, + is_10g ? XTP_GLB_USXGMII_SEL(0) : + is_5g ? XTP_GLB_USXGMII_SEL(1) : + is_2p5g ? XTP_GLB_USXGMII_SEL(2) : + XTP_GLB_USXGMII_SEL(3)); + mtk_xfi_tphy_set(xfi_tphy, REG_ANA_GLB_D0, XTP_GLB_USXGMII_EN); + + /* Release reset */ + mtk_xfi_tphy_set(xfi_tphy, REG_DIG_GLB_70, + XTP_PCS_RST_B | XTP_FRC_PCS_RST_B); + usleep_range(150, 500); + + /* Switch to P0 */ + mtk_xfi_tphy_rmw(xfi_tphy, REG_DIG_GLB_70, + XTP_PCS_PWD_SYNC_MASK | + XTP_PCS_PWD_ASYNC_MASK, + XTP_FRC_PCS_PWD_ASYNC | + XTP_PCS_UPDT | XTP_PCS_IN_FR_RG); + usleep_range(1, 5); + + mtk_xfi_tphy_clear(xfi_tphy, REG_DIG_GLB_70, XTP_PCS_UPDT); + usleep_range(15, 50); + + if (is_xgmii) { + /* Switch to Gen3 */ + mtk_xfi_tphy_rmw(xfi_tphy, REG_DIG_GLB_70, + XTP_PCS_MODE_MASK | XTP_PCS_UPDT, + XTP_PCS_MODE(2) | XTP_PCS_UPDT); + } else { + /* Switch to Gen2 */ + mtk_xfi_tphy_rmw(xfi_tphy, REG_DIG_GLB_70, + XTP_PCS_MODE_MASK | XTP_PCS_UPDT, + XTP_PCS_MODE(1) | XTP_PCS_UPDT); + } + usleep_range(1, 5); + + mtk_xfi_tphy_clear(xfi_tphy, REG_DIG_GLB_70, XTP_PCS_UPDT); + + usleep_range(100, 500); + + /* Enable MAC CK */ + mtk_xfi_tphy_set(xfi_tphy, REG_DIG_LN_TRX_B0, XTP_LN_TX_MACCK_EN); + mtk_xfi_tphy_clear(xfi_tphy, REG_DIG_GLB_F4, XFI_DPHY_AD_SGDT_FRC_EN); + + /* Enable TX data */ + mtk_xfi_tphy_set(xfi_tphy, REG_DIG_LN_TRX_40, + XTP_LN_FRC_TX_DATA_EN | XTP_LN_TX_DATA_EN); + usleep_range(400, 1000); +} + +static int mtk_xfi_tphy_set_mode(struct phy *phy, enum phy_mode mode, int + submode) +{ + struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy); + + if (mode != PHY_MODE_ETHERNET) + return -EINVAL; + + switch (submode) { + case PHY_INTERFACE_MODE_1000BASEX: + case PHY_INTERFACE_MODE_2500BASEX: + case PHY_INTERFACE_MODE_SGMII: + case PHY_INTERFACE_MODE_5GBASER: + case PHY_INTERFACE_MODE_10GBASER: + case PHY_INTERFACE_MODE_USXGMII: + mtk_xfi_tphy_setup(xfi_tphy, submode); + return 0; + default: + return -EINVAL; + } +} + +static int mtk_xfi_tphy_reset(struct phy *phy) +{ + struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy); + + reset_control_assert(xfi_tphy->reset); + usleep_range(100, 500); + reset_control_deassert(xfi_tphy->reset); + usleep_range(1, 10); + + return 0; +} + +static int mtk_xfi_tphy_power_on(struct phy *phy) +{ + struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy); + + return clk_bulk_prepare_enable(MTK_XFI_TPHY_NUM_CLOCKS, xfi_tphy->clocks); +} + +static int mtk_xfi_tphy_power_off(struct phy *phy) +{ + struct mtk_xfi_tphy *xfi_tphy = phy_get_drvdata(phy); + + clk_bulk_disable_unprepare(MTK_XFI_TPHY_NUM_CLOCKS, xfi_tphy->clocks); + + return 0; +} + +static const struct phy_ops mtk_xfi_tphy_ops = { + .power_on = mtk_xfi_tphy_power_on, + .power_off = mtk_xfi_tphy_power_off, + .set_mode = mtk_xfi_tphy_set_mode, + .reset = mtk_xfi_tphy_reset, + .owner = THIS_MODULE, +}; + +static int mtk_xfi_tphy_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct phy_provider *phy_provider; + struct mtk_xfi_tphy *xfi_tphy; + struct phy *phy; + + if (!np) + return -ENODEV; + + xfi_tphy = devm_kzalloc(&pdev->dev, sizeof(*xfi_tphy), GFP_KERNEL); + if (!xfi_tphy) + return -ENOMEM; + + xfi_tphy->base = devm_of_iomap(&pdev->dev, np, 0, NULL); + if (!xfi_tphy->base) + return -EIO; + + xfi_tphy->dev = &pdev->dev; + + xfi_tphy->clocks[0].id = "topxtal"; + xfi_tphy->clocks[0].clk = devm_clk_get(&pdev->dev, xfi_tphy->clocks[0].id); + if (IS_ERR(xfi_tphy->clocks[0].clk)) + return PTR_ERR(xfi_tphy->clocks[0].clk); + + xfi_tphy->clocks[1].id = "xfipll"; + xfi_tphy->clocks[1].clk = devm_clk_get(&pdev->dev, xfi_tphy->clocks[1].id); + if (IS_ERR(xfi_tphy->clocks[1].clk)) + return PTR_ERR(xfi_tphy->clocks[1].clk); + + xfi_tphy->reset = devm_reset_control_get_exclusive(&pdev->dev, NULL); + if (IS_ERR(xfi_tphy->reset)) + return PTR_ERR(xfi_tphy->reset); + + xfi_tphy->da_war = of_property_read_bool(np, + "mediatek,usxgmii-performance-errata"); + + phy = devm_phy_create(&pdev->dev, NULL, &mtk_xfi_tphy_ops); + if (IS_ERR(phy)) + return PTR_ERR(phy); + + phy_set_drvdata(phy, xfi_tphy); + + phy_provider = devm_of_phy_provider_register(&pdev->dev, + of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static const struct of_device_id mtk_xfi_tphy_match[] = { + { .compatible = "mediatek,mt7988-xfi-tphy", }, + { } +}; +MODULE_DEVICE_TABLE(of, mtk_xfi_tphy_match); + +static struct platform_driver mtk_xfi_tphy_driver = { + .probe = mtk_xfi_tphy_probe, + .driver = { + .name = "mtk-xfi-tphy", + .of_match_table = mtk_xfi_tphy_match, + }, +}; +module_platform_driver(mtk_xfi_tphy_driver); + +MODULE_DESCRIPTION("MediaTek XFI T-PHY driver"); +MODULE_AUTHOR("Daniel Golle "); +MODULE_AUTHOR("Bc-bocun Chen "); +MODULE_LICENSE("GPL");