1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
/*
* Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
*
* Copyright (C) 2007 Domen Puncer, Telargo, Inc.
* Copyright (C) 2008 Wolfram Sang, Pengutronix
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/of_platform.h>
#include <linux/of_mdio.h>
#include <asm/io.h>
#include <asm/mpc52xx.h>
#include "fec_mpc52xx.h"
struct mpc52xx_fec_mdio_priv {
struct mpc52xx_fec __iomem *regs;
int mdio_irqs[PHY_MAX_ADDR];
};
static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
int reg, u32 value)
{
struct mpc52xx_fec_mdio_priv *priv = bus->priv;
struct mpc52xx_fec __iomem *fec;
int tries = 3;
value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
fec = priv->regs;
out_be32(&fec->ievent, FEC_IEVENT_MII);
out_be32(&priv->regs->mii_data, value);
/* wait for it to finish, this takes about 23 us on lite5200b */
while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
msleep(1);
if (!tries)
return -ETIMEDOUT;
return value & FEC_MII_DATA_OP_RD ?
in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
}
static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
{
return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
}
static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
u16 data)
{
return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
data | FEC_MII_WRITE_FRAME);
}
static int mpc52xx_fec_mdio_probe(struct of_device *of,
const struct of_device_id *match)
{
struct device *dev = &of->dev;
struct device_node *np = of->node;
struct mii_bus *bus;
struct mpc52xx_fec_mdio_priv *priv;
struct resource res = {};
int err;
int i;
bus = mdiobus_alloc();
if (bus == NULL)
return -ENOMEM;
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (priv == NULL) {
err = -ENOMEM;
goto out_free;
}
bus->name = "mpc52xx MII bus";
bus->read = mpc52xx_fec_mdio_read;
bus->write = mpc52xx_fec_mdio_write;
/* setup irqs */
bus->irq = priv->mdio_irqs;
/* setup registers */
err = of_address_to_resource(np, 0, &res);
if (err)
goto out_free;
priv->regs = ioremap(res.start, res.end - res.start + 1);
if (priv->regs == NULL) {
err = -ENOMEM;
goto out_free;
}
snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
bus->priv = priv;
bus->parent = dev;
dev_set_drvdata(dev, bus);
/* set MII speed */
out_be32(&priv->regs->mii_speed,
((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1);
err = of_mdiobus_register(bus, np);
if (err)
goto out_unmap;
return 0;
out_unmap:
iounmap(priv->regs);
out_free:
for (i=0; i<PHY_MAX_ADDR; i++)
if (bus->irq[i] != PHY_POLL)
irq_dispose_mapping(bus->irq[i]);
kfree(bus->irq);
kfree(priv);
mdiobus_free(bus);
return err;
}
static int mpc52xx_fec_mdio_remove(struct of_device *of)
{
struct device *dev = &of->dev;
struct mii_bus *bus = dev_get_drvdata(dev);
struct mpc52xx_fec_mdio_priv *priv = bus->priv;
int i;
mdiobus_unregister(bus);
dev_set_drvdata(dev, NULL);
iounmap(priv->regs);
for (i=0; i<PHY_MAX_ADDR; i++)
if (bus->irq[i] != PHY_POLL)
irq_dispose_mapping(bus->irq[i]);
kfree(priv);
kfree(bus->irq);
mdiobus_free(bus);
return 0;
}
static struct of_device_id mpc52xx_fec_mdio_match[] = {
{ .compatible = "fsl,mpc5200b-mdio", },
{ .compatible = "fsl,mpc5200-mdio", },
{ .compatible = "mpc5200b-fec-phy", },
{}
};
MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
struct of_platform_driver mpc52xx_fec_mdio_driver = {
.name = "mpc5200b-fec-phy",
.probe = mpc52xx_fec_mdio_probe,
.remove = mpc52xx_fec_mdio_remove,
.match_table = mpc52xx_fec_mdio_match,
};
/* let fec driver call it, since this has to be registered before it */
EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
MODULE_LICENSE("Dual BSD/GPL");
|
