1 /*
2 * Applied Micro X-Gene SoC Ethernet v2 Driver
3 *
4 * Copyright (c) 2017, Applied Micro Circuits Corporation
5 * Author(s): Iyappan Subramanian <isubramanian@apm.com>
6 * Keyur Chudgar <kchudgar@apm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22 #include "main.h"
23
xge_mdio_write(struct mii_bus * bus,int phy_id,int reg,u16 data)24 static int xge_mdio_write(struct mii_bus *bus, int phy_id, int reg, u16 data)
25 {
26 struct xge_pdata *pdata = bus->priv;
27 u32 done, val = 0;
28 u8 wait = 10;
29
30 SET_REG_BITS(&val, PHY_ADDR, phy_id);
31 SET_REG_BITS(&val, REG_ADDR, reg);
32 xge_wr_csr(pdata, MII_MGMT_ADDRESS, val);
33
34 xge_wr_csr(pdata, MII_MGMT_CONTROL, data);
35 do {
36 usleep_range(5, 10);
37 done = xge_rd_csr(pdata, MII_MGMT_INDICATORS);
38 } while ((done & MII_MGMT_BUSY) && wait--);
39
40 if (done & MII_MGMT_BUSY) {
41 dev_err(&bus->dev, "MII_MGMT write failed\n");
42 return -ETIMEDOUT;
43 }
44
45 return 0;
46 }
47
xge_mdio_read(struct mii_bus * bus,int phy_id,int reg)48 static int xge_mdio_read(struct mii_bus *bus, int phy_id, int reg)
49 {
50 struct xge_pdata *pdata = bus->priv;
51 u32 data, done, val = 0;
52 u8 wait = 10;
53
54 SET_REG_BITS(&val, PHY_ADDR, phy_id);
55 SET_REG_BITS(&val, REG_ADDR, reg);
56 xge_wr_csr(pdata, MII_MGMT_ADDRESS, val);
57
58 xge_wr_csr(pdata, MII_MGMT_COMMAND, MII_READ_CYCLE);
59 do {
60 usleep_range(5, 10);
61 done = xge_rd_csr(pdata, MII_MGMT_INDICATORS);
62 } while ((done & MII_MGMT_BUSY) && wait--);
63
64 if (done & MII_MGMT_BUSY) {
65 dev_err(&bus->dev, "MII_MGMT read failed\n");
66 return -ETIMEDOUT;
67 }
68
69 data = xge_rd_csr(pdata, MII_MGMT_STATUS);
70 xge_wr_csr(pdata, MII_MGMT_COMMAND, 0);
71
72 return data;
73 }
74
xge_adjust_link(struct net_device * ndev)75 static void xge_adjust_link(struct net_device *ndev)
76 {
77 struct xge_pdata *pdata = netdev_priv(ndev);
78 struct phy_device *phydev = ndev->phydev;
79
80 if (phydev->link) {
81 if (pdata->phy_speed != phydev->speed) {
82 pdata->phy_speed = phydev->speed;
83 xge_mac_set_speed(pdata);
84 xge_mac_enable(pdata);
85 phy_print_status(phydev);
86 }
87 } else {
88 if (pdata->phy_speed != SPEED_UNKNOWN) {
89 pdata->phy_speed = SPEED_UNKNOWN;
90 xge_mac_disable(pdata);
91 phy_print_status(phydev);
92 }
93 }
94 }
95
xge_mdio_remove(struct net_device * ndev)96 void xge_mdio_remove(struct net_device *ndev)
97 {
98 struct xge_pdata *pdata = netdev_priv(ndev);
99 struct mii_bus *mdio_bus = pdata->mdio_bus;
100
101 if (ndev->phydev)
102 phy_disconnect(ndev->phydev);
103
104 if (mdio_bus->state == MDIOBUS_REGISTERED)
105 mdiobus_unregister(mdio_bus);
106
107 mdiobus_free(mdio_bus);
108 }
109
xge_mdio_config(struct net_device * ndev)110 int xge_mdio_config(struct net_device *ndev)
111 {
112 struct xge_pdata *pdata = netdev_priv(ndev);
113 struct device *dev = &pdata->pdev->dev;
114 struct mii_bus *mdio_bus;
115 struct phy_device *phydev;
116 int ret;
117
118 mdio_bus = mdiobus_alloc();
119 if (!mdio_bus)
120 return -ENOMEM;
121
122 mdio_bus->name = "APM X-Gene Ethernet (v2) MDIO Bus";
123 mdio_bus->read = xge_mdio_read;
124 mdio_bus->write = xge_mdio_write;
125 mdio_bus->priv = pdata;
126 mdio_bus->parent = dev;
127 snprintf(mdio_bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(dev));
128 pdata->mdio_bus = mdio_bus;
129
130 mdio_bus->phy_mask = 0x1;
131 ret = mdiobus_register(mdio_bus);
132 if (ret)
133 goto err;
134
135 phydev = phy_find_first(mdio_bus);
136 if (!phydev) {
137 dev_err(dev, "no PHY found\n");
138 ret = -ENODEV;
139 goto err;
140 }
141 phydev = phy_connect(ndev, phydev_name(phydev),
142 &xge_adjust_link,
143 pdata->resources.phy_mode);
144
145 if (IS_ERR(phydev)) {
146 netdev_err(ndev, "Could not attach to PHY\n");
147 ret = PTR_ERR(phydev);
148 goto err;
149 }
150
151 phydev->supported &= ~(SUPPORTED_10baseT_Half |
152 SUPPORTED_10baseT_Full |
153 SUPPORTED_100baseT_Half |
154 SUPPORTED_100baseT_Full |
155 SUPPORTED_1000baseT_Half |
156 SUPPORTED_AUI |
157 SUPPORTED_MII |
158 SUPPORTED_FIBRE |
159 SUPPORTED_BNC);
160 phydev->advertising = phydev->supported;
161 pdata->phy_speed = SPEED_UNKNOWN;
162
163 return 0;
164 err:
165 xge_mdio_remove(ndev);
166
167 return ret;
168 }
169
