1// SPDX-License-Identifier: GPL-2.0-only
  2/****************************************************************************
  3 * Driver for Solarflare network controllers and boards
  4 * Copyright 2009-2013 Solarflare Communications Inc.
  5 */
  6
  7/*
  8 * Driver for PHY related operations via MCDI.
  9 */
 10
 11#include <linux/slab.h>
 12#include "efx.h"
 13#include "mcdi_port.h"
 14#include "mcdi.h"
 15#include "mcdi_pcol.h"
 16#include "nic.h"
 17#include "selftest.h"
 18#include "mcdi_port_common.h"
 19
 20static int efx_mcdi_mdio_read(struct net_device *net_dev,
 21			      int prtad, int devad, u16 addr)
 22{
 23	struct efx_nic *efx = efx_netdev_priv(net_dev);
 24	MCDI_DECLARE_BUF(inbuf, MC_CMD_MDIO_READ_IN_LEN);
 25	MCDI_DECLARE_BUF(outbuf, MC_CMD_MDIO_READ_OUT_LEN);
 26	size_t outlen;
 27	int rc;
 28
 29	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_BUS, efx->mdio_bus);
 30	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_PRTAD, prtad);
 31	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_DEVAD, devad);
 32	MCDI_SET_DWORD(inbuf, MDIO_READ_IN_ADDR, addr);
 33
 34	rc = efx_mcdi_rpc(efx, MC_CMD_MDIO_READ, inbuf, sizeof(inbuf),
 35			  outbuf, sizeof(outbuf), &outlen);
 36	if (rc)
 37		return rc;
 38
 39	if (MCDI_DWORD(outbuf, MDIO_READ_OUT_STATUS) !=
 40	    MC_CMD_MDIO_STATUS_GOOD)
 41		return -EIO;
 42
 43	return (u16)MCDI_DWORD(outbuf, MDIO_READ_OUT_VALUE);
 44}
 45
 46static int efx_mcdi_mdio_write(struct net_device *net_dev,
 47			       int prtad, int devad, u16 addr, u16 value)
 48{
 49	struct efx_nic *efx = efx_netdev_priv(net_dev);
 50	MCDI_DECLARE_BUF(inbuf, MC_CMD_MDIO_WRITE_IN_LEN);
 51	MCDI_DECLARE_BUF(outbuf, MC_CMD_MDIO_WRITE_OUT_LEN);
 52	size_t outlen;
 53	int rc;
 54
 55	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_BUS, efx->mdio_bus);
 56	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_PRTAD, prtad);
 57	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_DEVAD, devad);
 58	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_ADDR, addr);
 59	MCDI_SET_DWORD(inbuf, MDIO_WRITE_IN_VALUE, value);
 60
 61	rc = efx_mcdi_rpc(efx, MC_CMD_MDIO_WRITE, inbuf, sizeof(inbuf),
 62			  outbuf, sizeof(outbuf), &outlen);
 63	if (rc)
 64		return rc;
 65
 66	if (MCDI_DWORD(outbuf, MDIO_WRITE_OUT_STATUS) !=
 67	    MC_CMD_MDIO_STATUS_GOOD)
 68		return -EIO;
 69
 70	return 0;
 71}
 72
 73u32 efx_mcdi_phy_get_caps(struct efx_nic *efx)
 74{
 75	struct efx_mcdi_phy_data *phy_data = efx->phy_data;
 76
 77	return phy_data->supported_cap;
 78}
 79
 80bool efx_mcdi_mac_check_fault(struct efx_nic *efx)
 81{
 82	MCDI_DECLARE_BUF(outbuf, MC_CMD_GET_LINK_OUT_LEN);
 83	size_t outlength;
 84	int rc;
 85
 86	BUILD_BUG_ON(MC_CMD_GET_LINK_IN_LEN != 0);
 87
 88	rc = efx_mcdi_rpc(efx, MC_CMD_GET_LINK, NULL, 0,
 89			  outbuf, sizeof(outbuf), &outlength);
 90	if (rc)
 91		return true;
 92
 93	return MCDI_DWORD(outbuf, GET_LINK_OUT_MAC_FAULT) != 0;
 94}
 95
 96int efx_mcdi_port_probe(struct efx_nic *efx)
 97{
 98	int rc;
 99
100	/* Set up MDIO structure for PHY */
101	efx->mdio.mode_support = MDIO_SUPPORTS_C45 | MDIO_EMULATE_C22;
102	efx->mdio.mdio_read = efx_mcdi_mdio_read;
103	efx->mdio.mdio_write = efx_mcdi_mdio_write;
104
105	/* Fill out MDIO structure, loopback modes, and initial link state */
106	rc = efx_mcdi_phy_probe(efx);
107	if (rc != 0)
108		return rc;
109
110	return efx_mcdi_mac_init_stats(efx);
111}
112
113void efx_mcdi_port_remove(struct efx_nic *efx)
114{
115	efx_mcdi_phy_remove(efx);
116	efx_mcdi_mac_fini_stats(efx);
117}