LXR linux/drivers/net/ethernet/sfc/mcdi

   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 = 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 = 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}
 118