include/linux/mdio.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * linux/mdio.h: definitions for MDIO (clause 45) transceivers
 * Copyright 2006-2009 Solarflare Communications Inc.
 */
#ifndef __LINUX_MDIO_H__
#define __LINUX_MDIO_H__

#include <uapi/linux/mdio.h>
#include <linux/mod_devicetable.h>

/* Or MII_ADDR_C45 into regnum for read/write on mii_bus to enable the 21 bit
 * IEEE 802.3ae clause 45 addressing mode used by 10GIGE phy chips.
 */
#define MII_ADDR_C45		(1<<30)
#define MII_DEVADDR_C45_SHIFT	16
#define MII_REGADDR_C45_MASK	GENMASK(15, 0)

struct gpio_desc;
struct mii_bus;
struct reset_control;

/* Multiple levels of nesting are possible. However typically this is
 * limited to nested DSA like layer, a MUX layer, and the normal
 * user. Instead of trying to handle the general case, just define
 * these cases.
 */
enum mdio_mutex_lock_class {
	MDIO_MUTEX_NORMAL,
	MDIO_MUTEX_MUX,
	MDIO_MUTEX_NESTED,
};

struct mdio_device {
	struct device dev;

	struct mii_bus *bus;
	char modalias[MDIO_NAME_SIZE];

	int (*bus_match)(struct device *dev, struct device_driver *drv);
	void (*device_free)(struct mdio_device *mdiodev);
	void (*device_remove)(struct mdio_device *mdiodev);

	/* Bus address of the MDIO device (0-31) */
	int addr;
	int flags;
	struct gpio_desc *reset_gpio;
	struct reset_control *reset_ctrl;
	unsigned int reset_assert_delay;
	unsigned int reset_deassert_delay;
};
#define to_mdio_device(d) container_of(d, struct mdio_device, dev)

/* struct mdio_driver_common: Common to all MDIO drivers */
struct mdio_driver_common {
	struct device_driver driver;
	int flags;
};
#define MDIO_DEVICE_FLAG_PHY		1
#define to_mdio_common_driver(d) \
	container_of(d, struct mdio_driver_common, driver)

/* struct mdio_driver: Generic MDIO driver */
struct mdio_driver {
	struct mdio_driver_common mdiodrv;

	/*
	 * Called during discovery.  Used to set
	 * up device-specific structures, if any
	 */
	int (*probe)(struct mdio_device *mdiodev);

	/* Clears up any memory if needed */
	void (*remove)(struct mdio_device *mdiodev);

	/* Quiesces the device on system shutdown, turns off interrupts etc */
	void (*shutdown)(struct mdio_device *mdiodev);
};
#define to_mdio_driver(d)						\
	container_of(to_mdio_common_driver(d), struct mdio_driver, mdiodrv)

/* device driver data */
static inline void mdiodev_set_drvdata(struct mdio_device *mdio, void *data)
{
	dev_set_drvdata(&mdio->dev, data);
}

static inline void *mdiodev_get_drvdata(struct mdio_device *mdio)
{
	return dev_get_drvdata(&mdio->dev);
}

void mdio_device_free(struct mdio_device *mdiodev);
struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr);
int mdio_device_register(struct mdio_device *mdiodev);
void mdio_device_remove(struct mdio_device *mdiodev);
void mdio_device_reset(struct mdio_device *mdiodev, int value);
int mdio_driver_register(struct mdio_driver *drv);
void mdio_driver_unregister(struct mdio_driver *drv);
int mdio_device_bus_match(struct device *dev, struct device_driver *drv);

static inline bool mdio_phy_id_is_c45(int phy_id)
{
	return (phy_id & MDIO_PHY_ID_C45) && !(phy_id & ~MDIO_PHY_ID_C45_MASK);
}

static inline __u16 mdio_phy_id_prtad(int phy_id)
{
	return (phy_id & MDIO_PHY_ID_PRTAD) >> 5;
}

static inline __u16 mdio_phy_id_devad(int phy_id)
{
	return phy_id & MDIO_PHY_ID_DEVAD;
}

/**
 * struct mdio_if_info - Ethernet controller MDIO interface
 * @prtad: PRTAD of the PHY (%MDIO_PRTAD_NONE if not present/unknown)
 * @mmds: Mask of MMDs expected to be present in the PHY.  This must be
 *	non-zero unless @prtad = %MDIO_PRTAD_NONE.
 * @mode_support: MDIO modes supported.  If %MDIO_SUPPORTS_C22 is set then
 *	MII register access will be passed through with @devad =
 *	%MDIO_DEVAD_NONE.  If %MDIO_EMULATE_C22 is set then access to
 *	commonly used clause 22 registers will be translated into
 *	clause 45 registers.
 * @dev: Net device structure
 * @mdio_read: Register read function; returns value or negative error code
 * @mdio_write: Register write function; returns 0 or negative error code
 */
struct mdio_if_info {
	int prtad;
	u32 mmds;
	unsigned mode_support;

	struct net_device *dev;
	int (*mdio_read)(struct net_device *dev, int prtad, int devad,
			 u16 addr);
	int (*mdio_write)(struct net_device *dev, int prtad, int devad,
			  u16 addr, u16 val);
};

#define MDIO_PRTAD_NONE			(-1)
#define MDIO_DEVAD_NONE			(-1)
#define MDIO_SUPPORTS_C22		1
#define MDIO_SUPPORTS_C45		2
#define MDIO_EMULATE_C22		4

struct ethtool_cmd;
struct ethtool_pauseparam;
extern int mdio45_probe(struct mdio_if_info *mdio, int prtad);
extern int mdio_set_flag(const struct mdio_if_info *mdio,
			 int prtad, int devad, u16 addr, int mask,
			 bool sense);
extern int mdio45_links_ok(const struct mdio_if_info *mdio, u32 mmds);
extern int mdio45_nway_restart(const struct mdio_if_info *mdio);
extern void mdio45_ethtool_gset_npage(const struct mdio_if_info *mdio,
				      struct ethtool_cmd *ecmd,
				      u32 npage_adv, u32 npage_lpa);
extern void
mdio45_ethtool_ksettings_get_npage(const struct mdio_if_info *mdio,
				   struct ethtool_link_ksettings *cmd,
				   u32 npage_adv, u32 npage_lpa);

/**
 * mdio45_ethtool_gset - get settings for ETHTOOL_GSET
 * @mdio: MDIO interface
 * @ecmd: Ethtool request structure
 *
 * Since the CSRs for auto-negotiation using next pages are not fully
 * standardised, this function does not attempt to decode them.  Use
 * mdio45_ethtool_gset_npage() to specify advertisement bits from next
 * pages.
 */
static inline void mdio45_ethtool_gset(const struct mdio_if_info *mdio,
				       struct ethtool_cmd *ecmd)
{
	mdio45_ethtool_gset_npage(mdio, ecmd, 0, 0);
}

/**
 * mdio45_ethtool_ksettings_get - get settings for ETHTOOL_GLINKSETTINGS
 * @mdio: MDIO interface
 * @cmd: Ethtool request structure
 *
 * Since the CSRs for auto-negotiation using next pages are not fully
 * standardised, this function does not attempt to decode them.  Use
 * mdio45_ethtool_ksettings_get_npage() to specify advertisement bits
 * from next pages.
 */
static inline void
mdio45_ethtool_ksettings_get(const struct mdio_if_info *mdio,
			     struct ethtool_link_ksettings *cmd)
{
	mdio45_ethtool_ksettings_get_npage(mdio, cmd, 0, 0);
}

extern int mdio_mii_ioctl(const struct mdio_if_info *mdio,
			  struct mii_ioctl_data *mii_data, int cmd);

/**
 * mmd_eee_cap_to_ethtool_sup_t
 * @eee_cap: value of the MMD EEE Capability register
 *
 * A small helper function that translates MMD EEE Capability (3.20) bits
 * to ethtool supported settings.
 */
static inline u32 mmd_eee_cap_to_ethtool_sup_t(u16 eee_cap)
{
	u32 supported = 0;

	if (eee_cap & MDIO_EEE_100TX)
		supported |= SUPPORTED_100baseT_Full;
	if (eee_cap & MDIO_EEE_1000T)
		supported |= SUPPORTED_1000baseT_Full;
	if (eee_cap & MDIO_EEE_10GT)
		supported |= SUPPORTED_10000baseT_Full;
	if (eee_cap & MDIO_EEE_1000KX)
		supported |= SUPPORTED_1000baseKX_Full;
	if (eee_cap & MDIO_EEE_10GKX4)
		supported |= SUPPORTED_10000baseKX4_Full;
	if (eee_cap & MDIO_EEE_10GKR)
		supported |= SUPPORTED_10000baseKR_Full;

	return supported;
}

/**
 * mmd_eee_adv_to_ethtool_adv_t
 * @eee_adv: value of the MMD EEE Advertisement/Link Partner Ability registers
 *
 * A small helper function that translates the MMD EEE Advertisment (7.60)
 * and MMD EEE Link Partner Ability (7.61) bits to ethtool advertisement
 * settings.
 */
static inline u32 mmd_eee_adv_to_ethtool_adv_t(u16 eee_adv)
{
	u32 adv = 0;

	if (eee_adv & MDIO_EEE_100TX)
		adv |= ADVERTISED_100baseT_Full;
	if (eee_adv & MDIO_EEE_1000T)
		adv |= ADVERTISED_1000baseT_Full;
	if (eee_adv & MDIO_EEE_10GT)
		adv |= ADVERTISED_10000baseT_Full;
	if (eee_adv & MDIO_EEE_1000KX)
		adv |= ADVERTISED_1000baseKX_Full;
	if (eee_adv & MDIO_EEE_10GKX4)
		adv |= ADVERTISED_10000baseKX4_Full;
	if (eee_adv & MDIO_EEE_10GKR)
		adv |= ADVERTISED_10000baseKR_Full;

	return adv;
}

/**
 * ethtool_adv_to_mmd_eee_adv_t
 * @adv: the ethtool advertisement settings
 *
 * A small helper function that translates ethtool advertisement settings
 * to EEE advertisements for the MMD EEE Advertisement (7.60) and
 * MMD EEE Link Partner Ability (7.61) registers.
 */
static inline u16 ethtool_adv_to_mmd_eee_adv_t(u32 adv)
{
	u16 reg = 0;

	if (adv & ADVERTISED_100baseT_Full)
		reg |= MDIO_EEE_100TX;
	if (adv & ADVERTISED_1000baseT_Full)
		reg |= MDIO_EEE_1000T;
	if (adv & ADVERTISED_10000baseT_Full)
		reg |= MDIO_EEE_10GT;
	if (adv & ADVERTISED_1000baseKX_Full)
		reg |= MDIO_EEE_1000KX;
	if (adv & ADVERTISED_10000baseKX4_Full)
		reg |= MDIO_EEE_10GKX4;
	if (adv & ADVERTISED_10000baseKR_Full)
		reg |= MDIO_EEE_10GKR;

	return reg;
}

/**
 * linkmode_adv_to_mii_10gbt_adv_t
 * @advertising: the linkmode advertisement settings
 *
 * A small helper function that translates linkmode advertisement
 * settings to phy autonegotiation advertisements for the C45
 * 10GBASE-T AN CONTROL (7.32) register.
 */
static inline u32 linkmode_adv_to_mii_10gbt_adv_t(unsigned long *advertising)
{
	u32 result = 0;

	if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
			      advertising))
		result |= MDIO_AN_10GBT_CTRL_ADV2_5G;
	if (linkmode_test_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
			      advertising))
		result |= MDIO_AN_10GBT_CTRL_ADV5G;
	if (linkmode_test_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
			      advertising))
		result |= MDIO_AN_10GBT_CTRL_ADV10G;

	return result;
}

/**
 * mii_10gbt_stat_mod_linkmode_lpa_t
 * @advertising: target the linkmode advertisement settings
 * @lpa: value of the C45 10GBASE-T AN STATUS register
 *
 * A small helper function that translates C45 10GBASE-T AN STATUS register bits
 * to linkmode advertisement settings. Other bits in advertising aren't changed.
 */
static inline void mii_10gbt_stat_mod_linkmode_lpa_t(unsigned long *advertising,
						     u32 lpa)
{
	linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
			 advertising, lpa & MDIO_AN_10GBT_STAT_LP2_5G);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
			 advertising, lpa & MDIO_AN_10GBT_STAT_LP5G);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
			 advertising, lpa & MDIO_AN_10GBT_STAT_LP10G);
}

int __mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
int __mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
int __mdiobus_modify_changed(struct mii_bus *bus, int addr, u32 regnum,
			     u16 mask, u16 set);

int mdiobus_read(struct mii_bus *bus, int addr, u32 regnum);
int mdiobus_read_nested(struct mii_bus *bus, int addr, u32 regnum);
int mdiobus_write(struct mii_bus *bus, int addr, u32 regnum, u16 val);
int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val);
int mdiobus_modify(struct mii_bus *bus, int addr, u32 regnum, u16 mask,
		   u16 set);

static inline u32 mdiobus_c45_addr(int devad, u16 regnum)
{
	return MII_ADDR_C45 | devad << MII_DEVADDR_C45_SHIFT | regnum;
}

static inline int __mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
				     u16 regnum)
{
	return __mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum));
}

static inline int __mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad,
				      u16 regnum, u16 val)
{
	return __mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum),
			       val);
}

static inline int mdiobus_c45_read(struct mii_bus *bus, int prtad, int devad,
				   u16 regnum)
{
	return mdiobus_read(bus, prtad, mdiobus_c45_addr(devad, regnum));
}

static inline int mdiobus_c45_write(struct mii_bus *bus, int prtad, int devad,
				    u16 regnum, u16 val)
{
	return mdiobus_write(bus, prtad, mdiobus_c45_addr(devad, regnum), val);
}

int mdiobus_register_device(struct mdio_device *mdiodev);
int mdiobus_unregister_device(struct mdio_device *mdiodev);
bool mdiobus_is_registered_device(struct mii_bus *bus, int addr);
struct phy_device *mdiobus_get_phy(struct mii_bus *bus, int addr);

/**
 * mdio_module_driver() - Helper macro for registering mdio drivers
 * @_mdio_driver: driver to register
 *
 * Helper macro for MDIO drivers which do not do anything special in module
 * init/exit. Each module may only use this macro once, and calling it
 * replaces module_init() and module_exit().
 */
#define mdio_module_driver(_mdio_driver)				\
static int __init mdio_module_init(void)				\
{									\
	return mdio_driver_register(&_mdio_driver);			\
}									\
module_init(mdio_module_init);						\
static void __exit mdio_module_exit(void)				\
{									\
	mdio_driver_unregister(&_mdio_driver);				\
}									\
module_exit(mdio_module_exit)

#endif /* __LINUX_MDIO_H__ */