drivers/net/ethernet/sfc/mcdi_port.c

   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
  20 static 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
  46 static 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
  73 u32 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
  80 bool 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
  96 int 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
 113 void efx_mcdi_port_remove(struct efx_nic *efx)
 114 {
 115         efx_mcdi_phy_remove(efx);
 116         efx_mcdi_mac_fini_stats(efx);
 117 }