// SPDX-License-Identifier: GPL-2.0+ /* * Broadcom UniMAC MDIO bus controller driver * * Copyright (C) 2014-2017 Broadcom */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_mdio.h> #include <linux/of_platform.h> #include <linux/phy.h> #include <linux/platform_data/mdio-bcm-unimac.h> #include <linux/platform_device.h> #include <linux/sched.h> #define MDIO_CMD … #define MDIO_START_BUSY … #define MDIO_READ_FAIL … #define MDIO_RD … #define MDIO_WR … #define MDIO_PMD_SHIFT … #define MDIO_PMD_MASK … #define MDIO_REG_SHIFT … #define MDIO_REG_MASK … #define MDIO_CFG … #define MDIO_C22 … #define MDIO_C45 … #define MDIO_CLK_DIV_SHIFT … #define MDIO_CLK_DIV_MASK … #define MDIO_SUPP_PREAMBLE … struct unimac_mdio_priv { … }; static inline u32 unimac_mdio_readl(struct unimac_mdio_priv *priv, u32 offset) { … } static inline void unimac_mdio_writel(struct unimac_mdio_priv *priv, u32 val, u32 offset) { … } static inline void unimac_mdio_start(struct unimac_mdio_priv *priv) { … } static int unimac_mdio_poll(void *wait_func_data) { … } static int unimac_mdio_read(struct mii_bus *bus, int phy_id, int reg) { … } static int unimac_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 val) { … } /* Workaround for integrated BCM7xxx Gigabit PHYs which have a problem with * their internal MDIO management controller making them fail to successfully * be read from or written to for the first transaction. We insert a dummy * BMSR read here to make sure that phy_get_device() and get_phy_id() can * correctly read the PHY MII_PHYSID1/2 registers and successfully register a * PHY device for this peripheral. * * Once the PHY driver is registered, we can workaround subsequent reads from * there (e.g: during system-wide power management). * * bus->reset is invoked before mdiobus_scan during mdiobus_register and is * therefore the right location to stick that workaround. Since we do not want * to read from non-existing PHYs, we either use bus->phy_mask or do a manual * Device Tree scan to limit the search area. */ static int unimac_mdio_reset(struct mii_bus *bus) { … } static int unimac_mdio_clk_set(struct unimac_mdio_priv *priv) { … } static int unimac_mdio_probe(struct platform_device *pdev) { … } static void unimac_mdio_remove(struct platform_device *pdev) { … } static int __maybe_unused unimac_mdio_resume(struct device *d) { … } static SIMPLE_DEV_PM_OPS(unimac_mdio_pm_ops, NULL, unimac_mdio_resume); static const struct of_device_id unimac_mdio_ids[] = …; MODULE_DEVICE_TABLE(of, unimac_mdio_ids); static struct platform_driver unimac_mdio_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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