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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
*
* Partially based on a patch from
* Copyright (c) 2014 Stefan Roese <sr@denx.de>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/of.h>
#include "lan9303.h"
/* Generate phy-addr and -reg from the input address */
#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
#define PHY_REG(x) (((x) >> 1) & 0x1f)
struct lan9303_mdio {
struct mdio_device *device;
struct lan9303 chip;
};
static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
{
mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
}
static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
{
struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
reg <<= 2; /* reg num to offset */
mutex_lock_nested(&sw_dev->device->bus->mdio_lock, MDIO_MUTEX_NESTED);
lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
mutex_unlock(&sw_dev->device->bus->mdio_lock);
return 0;
}
static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
{
return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
}
static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
{
struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
reg <<= 2; /* reg num to offset */
mutex_lock_nested(&sw_dev->device->bus->mdio_lock, MDIO_MUTEX_NESTED);
*val = lan9303_mdio_real_read(sw_dev->device, reg);
*val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
mutex_unlock(&sw_dev->device->bus->mdio_lock);
return 0;
}
static int lan9303_mdio_phy_write(struct lan9303 *chip, int phy, int reg,
u16 val)
{
struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
return mdiobus_write_nested(sw_dev->device->bus, phy, reg, val);
}
static int lan9303_mdio_phy_read(struct lan9303 *chip, int phy, int reg)
{
struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
return mdiobus_read_nested(sw_dev->device->bus, phy, reg);
}
static const struct lan9303_phy_ops lan9303_mdio_phy_ops = {
.phy_read = lan9303_mdio_phy_read,
.phy_write = lan9303_mdio_phy_write,
};
static const struct regmap_config lan9303_mdio_regmap_config = {
.reg_bits = 8,
.val_bits = 32,
.reg_stride = 1,
.can_multi_write = true,
.max_register = 0x0ff, /* address bits 0..1 are not used */
.reg_format_endian = REGMAP_ENDIAN_LITTLE,
.volatile_table = &lan9303_register_set,
.wr_table = &lan9303_register_set,
.rd_table = &lan9303_register_set,
.reg_read = lan9303_mdio_read,
.reg_write = lan9303_mdio_write,
.cache_type = REGCACHE_NONE,
};
static int lan9303_mdio_probe(struct mdio_device *mdiodev)
{
struct lan9303_mdio *sw_dev;
int ret;
sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
GFP_KERNEL);
if (!sw_dev)
return -ENOMEM;
sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
&lan9303_mdio_regmap_config);
if (IS_ERR(sw_dev->chip.regmap)) {
ret = PTR_ERR(sw_dev->chip.regmap);
dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
return ret;
}
/* link forward and backward */
sw_dev->device = mdiodev;
dev_set_drvdata(&mdiodev->dev, sw_dev);
sw_dev->chip.dev = &mdiodev->dev;
sw_dev->chip.ops = &lan9303_mdio_phy_ops;
ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
if (ret != 0)
return ret;
dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
return 0;
}
static void lan9303_mdio_remove(struct mdio_device *mdiodev)
{
struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
if (!sw_dev)
return;
lan9303_remove(&sw_dev->chip);
}
/*-------------------------------------------------------------------------*/
static const struct of_device_id lan9303_mdio_of_match[] = {
{ .compatible = "smsc,lan9303-mdio" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
static struct mdio_driver lan9303_mdio_driver = {
.mdiodrv.driver = {
.name = "LAN9303_MDIO",
.of_match_table = of_match_ptr(lan9303_mdio_of_match),
},
.probe = lan9303_mdio_probe,
.remove = lan9303_mdio_remove,
};
mdio_module_driver(lan9303_mdio_driver);
MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
MODULE_LICENSE("GPL v2");
|
