// SPDX-License-Identifier: GPL-2.0+ /* * Amlogic Meson GXL Internal PHY Driver * * Copyright (C) 2015 Amlogic, Inc. All rights reserved. * Copyright (C) 2016 BayLibre, SAS. All rights reserved. * Author: Neil Armstrong <[email protected]> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/mii.h> #include <linux/ethtool.h> #include <linux/phy.h> #include <linux/netdevice.h> #include <linux/bitfield.h> #include <linux/smscphy.h> #define TSTCNTL … #define TSTCNTL_READ … #define TSTCNTL_WRITE … #define TSTCNTL_REG_BANK_SEL … #define TSTCNTL_TEST_MODE … #define TSTCNTL_READ_ADDRESS … #define TSTCNTL_WRITE_ADDRESS … #define TSTREAD1 … #define TSTWRITE … #define BANK_ANALOG_DSP … #define BANK_WOL … #define BANK_BIST … /* WOL Registers */ #define LPI_STATUS … #define LPI_STATUS_RSV12 … /* BIST Registers */ #define FR_PLL_CONTROL … #define FR_PLL_DIV0 … #define FR_PLL_DIV1 … static int meson_gxl_open_banks(struct phy_device *phydev) { … } static void meson_gxl_close_banks(struct phy_device *phydev) { … } static int meson_gxl_read_reg(struct phy_device *phydev, unsigned int bank, unsigned int reg) { … } static int meson_gxl_write_reg(struct phy_device *phydev, unsigned int bank, unsigned int reg, uint16_t value) { … } static int meson_gxl_config_init(struct phy_device *phydev) { … } /* This function is provided to cope with the possible failures of this phy * during aneg process. When aneg fails, the PHY reports that aneg is done * but the value found in MII_LPA is wrong: * - Early failures: MII_LPA is just 0x0001. if MII_EXPANSION reports that * the link partner (LP) supports aneg but the LP never acked our base * code word, it is likely that we never sent it to begin with. * - Late failures: MII_LPA is filled with a value which seems to make sense * but it actually is not what the LP is advertising. It seems that we * can detect this using a magic bit in the WOL bank (reg 12 - bit 12). * If this particular bit is not set when aneg is reported being done, * it means MII_LPA is likely to be wrong. * * In both case, forcing a restart of the aneg process solve the problem. * When this failure happens, the first retry is usually successful but, * in some cases, it may take up to 6 retries to get a decent result */ static int meson_gxl_read_status(struct phy_device *phydev) { … } static struct phy_driver meson_gxl_phy[] = …; static struct mdio_device_id __maybe_unused meson_gxl_tbl[] = …; module_phy_driver(meson_gxl_phy); MODULE_DEVICE_TABLE(mdio, meson_gxl_tbl); MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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