linux/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c

// SPDX-License-Identifier: GPL-2.0-only
/*******************************************************************************
  STMMAC Ethernet Driver -- MDIO bus implementation
  Provides Bus interface for MII registers

  Copyright (C) 2007-2009  STMicroelectronics Ltd


  Author: Carl Shaw <[email protected]>
  Maintainer: Giuseppe Cavallaro <[email protected]>
*******************************************************************************/

#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/mii.h>
#include <linux/of_mdio.h>
#include <linux/pm_runtime.h>
#include <linux/phy.h>
#include <linux/property.h>
#include <linux/slab.h>

#include "dwxgmac2.h"
#include "stmmac.h"

#define MII_BUSY …
#define MII_WRITE …
#define MII_DATA_MASK …

/* GMAC4 defines */
#define MII_GMAC4_GOC_SHIFT …
#define MII_GMAC4_REG_ADDR_SHIFT …
#define MII_GMAC4_WRITE …
#define MII_GMAC4_READ …
#define MII_GMAC4_C45E …

/* XGMAC defines */
#define MII_XGMAC_SADDR …
#define MII_XGMAC_CMD_SHIFT …
#define MII_XGMAC_WRITE …
#define MII_XGMAC_READ …
#define MII_XGMAC_BUSY …
#define MII_XGMAC_MAX_C22ADDR …
#define MII_XGMAC_C22P_MASK …
#define MII_XGMAC_PA_SHIFT …
#define MII_XGMAC_DA_SHIFT …

static void stmmac_xgmac2_c45_format(struct stmmac_priv *priv, int phyaddr,
				     int devad, int phyreg, u32 *hw_addr)
{ … }

static void stmmac_xgmac2_c22_format(struct stmmac_priv *priv, int phyaddr,
				     int phyreg, u32 *hw_addr)
{ … }

static int stmmac_xgmac2_mdio_read(struct stmmac_priv *priv, u32 addr,
				   u32 value)
{ … }

static int stmmac_xgmac2_mdio_read_c22(struct mii_bus *bus, int phyaddr,
				       int phyreg)
{ … }

static int stmmac_xgmac2_mdio_read_c45(struct mii_bus *bus, int phyaddr,
				       int devad, int phyreg)
{ … }

static int stmmac_xgmac2_mdio_write(struct stmmac_priv *priv, u32 addr,
				    u32 value, u16 phydata)
{ … }

static int stmmac_xgmac2_mdio_write_c22(struct mii_bus *bus, int phyaddr,
					int phyreg, u16 phydata)
{ … }

static int stmmac_xgmac2_mdio_write_c45(struct mii_bus *bus, int phyaddr,
					int devad, int phyreg, u16 phydata)
{ … }

static int stmmac_mdio_read(struct stmmac_priv *priv, int data, u32 value)
{ … }

/**
 * stmmac_mdio_read_c22
 * @bus: points to the mii_bus structure
 * @phyaddr: MII addr
 * @phyreg: MII reg
 * Description: it reads data from the MII register from within the phy device.
 * For the 7111 GMAC, we must set the bit 0 in the MII address register while
 * accessing the PHY registers.
 * Fortunately, it seems this has no drawback for the 7109 MAC.
 */
static int stmmac_mdio_read_c22(struct mii_bus *bus, int phyaddr, int phyreg)
{ … }

/**
 * stmmac_mdio_read_c45
 * @bus: points to the mii_bus structure
 * @phyaddr: MII addr
 * @devad: device address to read
 * @phyreg: MII reg
 * Description: it reads data from the MII register from within the phy device.
 * For the 7111 GMAC, we must set the bit 0 in the MII address register while
 * accessing the PHY registers.
 * Fortunately, it seems this has no drawback for the 7109 MAC.
 */
static int stmmac_mdio_read_c45(struct mii_bus *bus, int phyaddr, int devad,
				int phyreg)
{ … }

static int stmmac_mdio_write(struct stmmac_priv *priv, int data, u32 value)
{ … }

/**
 * stmmac_mdio_write_c22
 * @bus: points to the mii_bus structure
 * @phyaddr: MII addr
 * @phyreg: MII reg
 * @phydata: phy data
 * Description: it writes the data into the MII register from within the device.
 */
static int stmmac_mdio_write_c22(struct mii_bus *bus, int phyaddr, int phyreg,
				 u16 phydata)
{ … }

/**
 * stmmac_mdio_write_c45
 * @bus: points to the mii_bus structure
 * @phyaddr: MII addr
 * @phyreg: MII reg
 * @devad: device address to read
 * @phydata: phy data
 * Description: it writes the data into the MII register from within the device.
 */
static int stmmac_mdio_write_c45(struct mii_bus *bus, int phyaddr,
				 int devad, int phyreg, u16 phydata)
{ … }

/**
 * stmmac_mdio_reset
 * @bus: points to the mii_bus structure
 * Description: reset the MII bus
 */
int stmmac_mdio_reset(struct mii_bus *bus)
{ … }

int stmmac_pcs_setup(struct net_device *ndev)
{ … }

void stmmac_pcs_clean(struct net_device *ndev)
{ … }

/**
 * stmmac_mdio_register
 * @ndev: net device structure
 * Description: it registers the MII bus
 */
int stmmac_mdio_register(struct net_device *ndev)
{ … }

/**
 * stmmac_mdio_unregister
 * @ndev: net device structure
 * Description: it unregisters the MII bus
 */
int stmmac_mdio_unregister(struct net_device *ndev)
{ … }