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}
118