drivers/net/ethernet/sfc/siena/mcdi_port.c

// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2009-2013 Solarflare Communications Inc.
 */

/*
 * Driver for PHY related operations via MCDI.
 */

#include <linux/slab.h>
#include "efx.h"
#include "mcdi_port.h"
#include "mcdi.h"
#include "mcdi_pcol.h"
#include "nic.h"
#include "selftest.h"
#include "mcdi_port_common.h"

static int efx_mcdi_mdio_read(struct net_device *net_dev,
			      int prtad, int devad, u16 addr)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_MDIO_READ_IN_LEN);
	MCDI_DECLARE_BUF(outbuf, MC_CMD_MDIO_READ_OUT_LEN);
	size_t outlen;
	int rc;

	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_BUS, efx->mdio_bus);
	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_PRTAD, prtad);
	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_DEVAD, devad);
	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_ADDR, addr);

	rc = efx_siena_mcdi_rpc(efx, MC_CMD_MDIO_READ, inbuf, sizeof(inbuf),
				outbuf, sizeof(outbuf), &outlen);
	if (rc)
		return rc;

	if (MCDI_DWORD(outbuf, MDIO_READ_OUT_STATUS) !=
	    MC_CMD_MDIO_STATUS_GOOD)
		return -EIO;

	return (u16)MCDI_DWORD(outbuf, MDIO_READ_OUT_VALUE);
}

static int efx_mcdi_mdio_write(struct net_device *net_dev,
			       int prtad, int devad, u16 addr, u16 value)
{
	struct efx_nic *efx = netdev_priv(net_dev);
	MCDI_DECLARE_BUF(inbuf, MC_CMD_MDIO_WRITE_IN_LEN);
	MCDI_DECLARE_BUF(outbuf, MC_CMD_MDIO_WRITE_OUT_LEN);
	size_t outlen;
	int rc;

	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_BUS, efx->mdio_bus);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_PRTAD, prtad);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_DEVAD, devad);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_ADDR, addr);
	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_VALUE, value);

	rc = efx_siena_mcdi_rpc(efx, MC_CMD_MDIO_WRITE, inbuf, sizeof(inbuf),
				outbuf, sizeof(outbuf), &outlen);
	if (rc)
		return rc;

	if (MCDI_DWORD(outbuf, MDIO_WRITE_OUT_STATUS) !=
	    MC_CMD_MDIO_STATUS_GOOD)
		return -EIO;

	return 0;
}

bool efx_siena_mcdi_mac_check_fault(struct efx_nic *efx)
{
	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_LINK_OUT_LEN);
	size_t outlength;
	int rc;

	BUILD_BUG_ON(MC_CMD_GET_LINK_IN_LEN != 0);

	rc = efx_siena_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
				outbuf, sizeof(outbuf), &outlength);
	if (rc)
		return true;

	return MCDI_DWORD(outbuf, GET_LINK_OUT_MAC_FAULT) != 0;
}

int efx_siena_mcdi_port_probe(struct efx_nic *efx)
{
	int rc;

	/* Set up MDIO structure for PHY */
	efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
	efx->mdio.mdio_read = efx_mcdi_mdio_read;
	efx->mdio.mdio_write = efx_mcdi_mdio_write;

	/* Fill out MDIO structure, loopback modes, and initial link state */
	rc = efx_siena_mcdi_phy_probe(efx);
	if (rc != 0)
		return rc;

	return efx_siena_mcdi_mac_init_stats(efx);
}

void efx_siena_mcdi_port_remove(struct efx_nic *efx)
{
	efx_siena_mcdi_phy_remove(efx);
	efx_siena_mcdi_mac_fini_stats(efx);
}