1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Applied Micro X-Gene SoC Ethernet v2 Driver
4 *
5 * Copyright (c) 2017, Applied Micro Circuits Corporation
6 * Author(s): Iyappan Subramanian <isubramanian@apm.com>
7 *	      Keyur Chudgar <kchudgar@apm.com>
8 */
9
10#include "main.h"
11
12static int xge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
13{
14	struct xge_pdata *pdata = bus->priv;
15	u32 done, val = 0;
16	u8 wait = 10;
17
18	SET_REG_BITS(&val, PHY_ADDR, phy_id);
19	SET_REG_BITS(&val, REG_ADDR, reg);
20	xge_wr_csr(pdata, MII_MGMT_ADDRESS, val);
21
22	xge_wr_csr(pdata, MII_MGMT_CONTROL, data);
23	do {
24		usleep_range(5, 10);
25		done = xge_rd_csr(pdata, MII_MGMT_INDICATORS);
26	} while ((done & MII_MGMT_BUSY) && wait--);
27
28	if (done & MII_MGMT_BUSY) {
29		dev_err(&bus->dev, "MII_MGMT write failed\n");
30		return -ETIMEDOUT;
31	}
32
33	return 0;
34}
35
36static int xge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
37{
38	struct xge_pdata *pdata = bus->priv;
39	u32 data, done, val = 0;
40	u8 wait = 10;
41
42	SET_REG_BITS(&val, PHY_ADDR, phy_id);
43	SET_REG_BITS(&val, REG_ADDR, reg);
44	xge_wr_csr(pdata, MII_MGMT_ADDRESS, val);
45
46	xge_wr_csr(pdata, MII_MGMT_COMMAND, MII_READ_CYCLE);
47	do {
48		usleep_range(5, 10);
49		done = xge_rd_csr(pdata, MII_MGMT_INDICATORS);
50	} while ((done & MII_MGMT_BUSY) && wait--);
51
52	if (done & MII_MGMT_BUSY) {
53		dev_err(&bus->dev, "MII_MGMT read failed\n");
54		return -ETIMEDOUT;
55	}
56
57	data = xge_rd_csr(pdata, MII_MGMT_STATUS);
58	xge_wr_csr(pdata, MII_MGMT_COMMAND, 0);
59
60	return data;
61}
62
63static void xge_adjust_link(struct net_device *ndev)
64{
65	struct xge_pdata *pdata = netdev_priv(ndev);
66	struct phy_device *phydev = ndev->phydev;
67
68	if (phydev->link) {
69		if (pdata->phy_speed != phydev->speed) {
70			pdata->phy_speed = phydev->speed;
71			xge_mac_set_speed(pdata);
72			xge_mac_enable(pdata);
73			phy_print_status(phydev);
74		}
75	} else {
76		if (pdata->phy_speed != SPEED_UNKNOWN) {
77			pdata->phy_speed = SPEED_UNKNOWN;
78			xge_mac_disable(pdata);
79			phy_print_status(phydev);
80		}
81	}
82}
83
84void xge_mdio_remove(struct net_device *ndev)
85{
86	struct xge_pdata *pdata = netdev_priv(ndev);
87	struct mii_bus *mdio_bus = pdata->mdio_bus;
88
89	if (ndev->phydev)
90		phy_disconnect(ndev->phydev);
91
92	if (mdio_bus->state == MDIOBUS_REGISTERED)
93		mdiobus_unregister(mdio_bus);
94
95	mdiobus_free(mdio_bus);
96}
97
98int xge_mdio_config(struct net_device *ndev)
99{
100	__ETHTOOL_DECLARE_LINK_MODE_MASK(mask) = { 0, };
101	struct xge_pdata *pdata = netdev_priv(ndev);
102	struct device *dev = &pdata->pdev->dev;
103	struct mii_bus *mdio_bus;
104	struct phy_device *phydev;
105	int ret;
106
107	mdio_bus = mdiobus_alloc();
108	if (!mdio_bus)
109		return -ENOMEM;
110
111	mdio_bus->name = "APM X-Gene Ethernet (v2) MDIO Bus";
112	mdio_bus->read = xge_mdio_read;
113	mdio_bus->write = xge_mdio_write;
114	mdio_bus->priv = pdata;
115	mdio_bus->parent = dev;
116	snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(dev));
117	pdata->mdio_bus = mdio_bus;
118
119	mdio_bus->phy_mask = 0x1;
120	ret = mdiobus_register(mdio_bus);
121	if (ret)
122		goto err;
123
124	phydev = phy_find_first(mdio_bus);
125	if (!phydev) {
126		dev_err(dev, "no PHY found\n");
127		ret = -ENODEV;
128		goto err;
129	}
130	phydev = phy_connect(ndev, phydev_name(phydev),
131			     &xge_adjust_link,
132			     pdata->resources.phy_mode);
133
134	if (IS_ERR(phydev)) {
135		netdev_err(ndev, "Could not attach to PHY\n");
136		ret = PTR_ERR(phydev);
137		goto err;
138	}
139
140	linkmode_set_bit_array(phy_10_100_features_array,
141			       ARRAY_SIZE(phy_10_100_features_array),
142			       mask);
143	linkmode_set_bit(ETHTOOL_LINK_MODE_1000baseT_Half_BIT, mask);
144	linkmode_set_bit(ETHTOOL_LINK_MODE_AUI_BIT, mask);
145	linkmode_set_bit(ETHTOOL_LINK_MODE_MII_BIT, mask);
146	linkmode_set_bit(ETHTOOL_LINK_MODE_FIBRE_BIT, mask);
147	linkmode_set_bit(ETHTOOL_LINK_MODE_BNC_BIT, mask);
148
149	linkmode_andnot(phydev->supported, phydev->supported, mask);
150	linkmode_copy(phydev->advertising, phydev->supported);
151	pdata->phy_speed = SPEED_UNKNOWN;
152
153	return 0;
154err:
155	xge_mdio_remove(ndev);
156
157	return ret;
158}
159