// SPDX-License-Identifier: GPL-2.0+ /* * Driver for Microchip 10BASE-T1S PHYs * * Support: Microchip Phys: * lan8670/1/2 Rev.B1 * lan8650/1 Rev.B0 Internal PHYs */ #include #include #include #define PHY_ID_LAN867X_REVB1 0x0007C162 #define PHY_ID_LAN865X_REVB0 0x0007C1B3 #define LAN867X_REG_STS2 0x0019 #define LAN867x_RESET_COMPLETE_STS BIT(11) #define LAN865X_REG_CFGPARAM_ADDR 0x00D8 #define LAN865X_REG_CFGPARAM_DATA 0x00D9 #define LAN865X_REG_CFGPARAM_CTRL 0x00DA #define LAN865X_REG_STS2 0x0019 #define LAN865X_CFGPARAM_READ_ENABLE BIT(1) /* The arrays below are pulled from the following table from AN1699 * Access MMD Address Value Mask * RMW 0x1F 0x00D0 0x0002 0x0E03 * RMW 0x1F 0x00D1 0x0000 0x0300 * RMW 0x1F 0x0084 0x3380 0xFFC0 * RMW 0x1F 0x0085 0x0006 0x000F * RMW 0x1F 0x008A 0xC000 0xF800 * RMW 0x1F 0x0087 0x801C 0x801C * RMW 0x1F 0x0088 0x033F 0x1FFF * W 0x1F 0x008B 0x0404 ------ * RMW 0x1F 0x0080 0x0600 0x0600 * RMW 0x1F 0x00F1 0x2400 0x7F00 * RMW 0x1F 0x0096 0x2000 0x2000 * W 0x1F 0x0099 0x7F80 ------ */ static const u32 lan867x_revb1_fixup_registers[12] = { 0x00D0, 0x00D1, 0x0084, 0x0085, 0x008A, 0x0087, 0x0088, 0x008B, 0x0080, 0x00F1, 0x0096, 0x0099, }; static const u16 lan867x_revb1_fixup_values[12] = { 0x0002, 0x0000, 0x3380, 0x0006, 0xC000, 0x801C, 0x033F, 0x0404, 0x0600, 0x2400, 0x2000, 0x7F80, }; static const u16 lan867x_revb1_fixup_masks[12] = { 0x0E03, 0x0300, 0xFFC0, 0x000F, 0xF800, 0x801C, 0x1FFF, 0xFFFF, 0x0600, 0x7F00, 0x2000, 0xFFFF, }; /* LAN865x Rev.B0 configuration parameters from AN1760 */ static const u32 lan865x_revb0_fixup_registers[28] = { 0x0091, 0x0081, 0x0043, 0x0044, 0x0045, 0x0053, 0x0054, 0x0055, 0x0040, 0x0050, 0x00D0, 0x00E9, 0x00F5, 0x00F4, 0x00F8, 0x00F9, 0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7, 0x00B8, 0x00B9, 0x00BA, 0x00BB, }; static const u16 lan865x_revb0_fixup_values[28] = { 0x9660, 0x00C0, 0x00FF, 0xFFFF, 0x0000, 0x00FF, 0xFFFF, 0x0000, 0x0002, 0x0002, 0x5F21, 0x9E50, 0x1CF8, 0xC020, 0x9B00, 0x4E53, 0x0103, 0x0910, 0x1D26, 0x002A, 0x0103, 0x070D, 0x1720, 0x0027, 0x0509, 0x0E13, 0x1C25, 0x002B, }; static const u16 lan865x_revb0_fixup_cfg_regs[5] = { 0x0084, 0x008A, 0x00AD, 0x00AE, 0x00AF }; /* Pulled from AN1760 describing 'indirect read' * * write_register(0x4, 0x00D8, addr) * write_register(0x4, 0x00DA, 0x2) * return (int8)(read_register(0x4, 0x00D9)) * * 0x4 refers to memory map selector 4, which maps to MDIO_MMD_VEND2 */ static int lan865x_revb0_indirect_read(struct phy_device *phydev, u16 addr) { int ret; ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, LAN865X_REG_CFGPARAM_ADDR, addr); if (ret) return ret; ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, LAN865X_REG_CFGPARAM_CTRL, LAN865X_CFGPARAM_READ_ENABLE); if (ret) return ret; return phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN865X_REG_CFGPARAM_DATA); } /* This is pulled straight from AN1760 from 'calculation of offset 1' & * 'calculation of offset 2' */ static int lan865x_generate_cfg_offsets(struct phy_device *phydev, s8 offsets[2]) { const u16 fixup_regs[2] = {0x0004, 0x0008}; int ret; for (int i = 0; i < ARRAY_SIZE(fixup_regs); i++) { ret = lan865x_revb0_indirect_read(phydev, fixup_regs[i]); if (ret < 0) return ret; if (ret & BIT(4)) offsets[i] = ret | 0xE0; else offsets[i] = ret; } return 0; } static int lan865x_read_cfg_params(struct phy_device *phydev, u16 cfg_params[]) { int ret; for (int i = 0; i < ARRAY_SIZE(lan865x_revb0_fixup_cfg_regs); i++) { ret = phy_read_mmd(phydev, MDIO_MMD_VEND2, lan865x_revb0_fixup_cfg_regs[i]); if (ret < 0) return ret; cfg_params[i] = (u16)ret; } return 0; } static int lan865x_write_cfg_params(struct phy_device *phydev, u16 cfg_params[]) { int ret; for (int i = 0; i < ARRAY_SIZE(lan865x_revb0_fixup_cfg_regs); i++) { ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, lan865x_revb0_fixup_cfg_regs[i], cfg_params[i]); if (ret) return ret; } return 0; } static int lan865x_setup_cfgparam(struct phy_device *phydev) { u16 cfg_params[ARRAY_SIZE(lan865x_revb0_fixup_cfg_regs)]; u16 cfg_results[5]; s8 offsets[2]; int ret; ret = lan865x_generate_cfg_offsets(phydev, offsets); if (ret) return ret; ret = lan865x_read_cfg_params(phydev, cfg_params); if (ret) return ret; cfg_results[0] = (cfg_params[0] & 0x000F) | FIELD_PREP(GENMASK(15, 10), 9 + offsets[0]) | FIELD_PREP(GENMASK(15, 4), 14 + offsets[0]); cfg_results[1] = (cfg_params[1] & 0x03FF) | FIELD_PREP(GENMASK(15, 10), 40 + offsets[1]); cfg_results[2] = (cfg_params[2] & 0xC0C0) | FIELD_PREP(GENMASK(15, 8), 5 + offsets[0]) | (9 + offsets[0]); cfg_results[3] = (cfg_params[3] & 0xC0C0) | FIELD_PREP(GENMASK(15, 8), 9 + offsets[0]) | (14 + offsets[0]); cfg_results[4] = (cfg_params[4] & 0xC0C0) | FIELD_PREP(GENMASK(15, 8), 17 + offsets[0]) | (22 + offsets[0]); return lan865x_write_cfg_params(phydev, cfg_results); } static int lan865x_revb0_config_init(struct phy_device *phydev) { int ret; /* Reference to AN1760 * https://ww1.microchip.com/downloads/aemDocuments/documents/AIS/ProductDocuments/SupportingCollateral/AN-LAN8650-1-Configuration-60001760.pdf */ for (int i = 0; i < ARRAY_SIZE(lan865x_revb0_fixup_registers); i++) { ret = phy_write_mmd(phydev, MDIO_MMD_VEND2, lan865x_revb0_fixup_registers[i], lan865x_revb0_fixup_values[i]); if (ret) return ret; } /* Function to calculate and write the configuration parameters in the * 0x0084, 0x008A, 0x00AD, 0x00AE and 0x00AF registers (from AN1760) */ return lan865x_setup_cfgparam(phydev); } static int lan867x_revb1_config_init(struct phy_device *phydev) { int err; /* The chip completes a reset in 3us, we might get here earlier than * that, as an added margin we'll conditionally sleep 5us. */ err = phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN867X_REG_STS2); if (err < 0) return err; if (!(err & LAN867x_RESET_COMPLETE_STS)) { udelay(5); err = phy_read_mmd(phydev, MDIO_MMD_VEND2, LAN867X_REG_STS2); if (err < 0) return err; if (!(err & LAN867x_RESET_COMPLETE_STS)) { phydev_err(phydev, "PHY reset failed\n"); return -ENODEV; } } /* Reference to AN1699 * https://ww1.microchip.com/downloads/aemDocuments/documents/AIS/ProductDocuments/SupportingCollateral/AN-LAN8670-1-2-config-60001699.pdf * AN1699 says Read, Modify, Write, but the Write is not required if the * register already has the required value. So it is safe to use * phy_modify_mmd here. */ for (int i = 0; i < ARRAY_SIZE(lan867x_revb1_fixup_registers); i++) { err = phy_modify_mmd(phydev, MDIO_MMD_VEND2, lan867x_revb1_fixup_registers[i], lan867x_revb1_fixup_masks[i], lan867x_revb1_fixup_values[i]); if (err) return err; } return 0; } static int lan86xx_read_status(struct phy_device *phydev) { /* The phy has some limitations, namely: * - always reports link up * - only supports 10MBit half duplex * - does not support auto negotiate */ phydev->link = 1; phydev->duplex = DUPLEX_HALF; phydev->speed = SPEED_10; phydev->autoneg = AUTONEG_DISABLE; return 0; } /* OPEN Alliance 10BASE-T1x compliance MAC-PHYs will have both C22 and * C45 registers space. If the PHY is discovered via C22 bus protocol it assumes * it uses C22 protocol and always uses C22 registers indirect access to access * C45 registers. This is because, we don't have a clean separation between * C22/C45 register space and C22/C45 MDIO bus protocols. Resulting, PHY C45 * registers direct access can't be used which can save multiple SPI bus access. * To support this feature, set .read_mmd/.write_mmd in the PHY driver to call * .read_c45/.write_c45 in the OPEN Alliance framework * drivers/net/ethernet/oa_tc6.c */ static int lan865x_phy_read_mmd(struct phy_device *phydev, int devnum, u16 regnum) { struct mii_bus *bus = phydev->mdio.bus; int addr = phydev->mdio.addr; return __mdiobus_c45_read(bus, addr, devnum, regnum); } static int lan865x_phy_write_mmd(struct phy_device *phydev, int devnum, u16 regnum, u16 val) { struct mii_bus *bus = phydev->mdio.bus; int addr = phydev->mdio.addr; return __mdiobus_c45_write(bus, addr, devnum, regnum, val); } static struct phy_driver microchip_t1s_driver[] = { { PHY_ID_MATCH_EXACT(PHY_ID_LAN867X_REVB1), .name = "LAN867X Rev.B1", .features = PHY_BASIC_T1S_P2MP_FEATURES, .config_init = lan867x_revb1_config_init, .read_status = lan86xx_read_status, .get_plca_cfg = genphy_c45_plca_get_cfg, .set_plca_cfg = genphy_c45_plca_set_cfg, .get_plca_status = genphy_c45_plca_get_status, }, { PHY_ID_MATCH_EXACT(PHY_ID_LAN865X_REVB0), .name = "LAN865X Rev.B0 Internal Phy", .features = PHY_BASIC_T1S_P2MP_FEATURES, .config_init = lan865x_revb0_config_init, .read_status = lan86xx_read_status, .read_mmd = lan865x_phy_read_mmd, .write_mmd = lan865x_phy_write_mmd, .get_plca_cfg = genphy_c45_plca_get_cfg, .set_plca_cfg = genphy_c45_plca_set_cfg, .get_plca_status = genphy_c45_plca_get_status, }, }; module_phy_driver(microchip_t1s_driver); static struct mdio_device_id __maybe_unused tbl[] = { { PHY_ID_MATCH_EXACT(PHY_ID_LAN867X_REVB1) }, { PHY_ID_MATCH_EXACT(PHY_ID_LAN865X_REVB0) }, { } }; MODULE_DEVICE_TABLE(mdio, tbl); MODULE_DESCRIPTION("Microchip 10BASE-T1S PHYs driver"); MODULE_AUTHOR("Ramón Nordin Rodriguez"); MODULE_LICENSE("GPL");