linux/drivers/net/phy/swphy.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Software PHY emulation
 *
 * Code taken from fixed_phy.c by Russell King.
 *
 * Author: Vitaly Bordug <[email protected]>
 *         Anton Vorontsov <[email protected]>
 *
 * Copyright (c) 2006-2007 MontaVista Software, Inc.
 */
#include <linux/export.h>
#include <linux/mii.h>
#include <linux/phy.h>
#include <linux/phy_fixed.h>

#include "swphy.h"

#define MII_REGS_NUM …

struct swmii_regs { … };

enum { … };

/*
 * These two tables get bitwise-anded together to produce the final result.
 * This means the speed table must contain both duplex settings, and the
 * duplex table must contain all speed settings.
 */
static const struct swmii_regs speed[] = …;

static const struct swmii_regs duplex[] = …;

static int swphy_decode_speed(int speed)
{ … }

/**
 * swphy_validate_state - validate the software phy status
 * @state: software phy status
 *
 * This checks that we can represent the state stored in @state can be
 * represented in the emulated MII registers.  Returns 0 if it can,
 * otherwise returns -EINVAL.
 */
int swphy_validate_state(const struct fixed_phy_status *state)
{ … }
EXPORT_SYMBOL_GPL(…);

/**
 * swphy_read_reg - return a MII register from the fixed phy state
 * @reg: MII register
 * @state: fixed phy status
 *
 * Return the MII @reg register generated from the fixed phy state @state.
 */
int swphy_read_reg(int reg, const struct fixed_phy_status *state)
{ … }
EXPORT_SYMBOL_GPL(…);