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
|
/*
* dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
*
* Copyright (C) 2013 Chen-Yu Tsai
*
* Chen-Yu Tsai <wens@csie.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/stmmac.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/of_net.h>
#include <linux/regulator/consumer.h>
#include "stmmac_platform.h"
struct sunxi_priv_data {
int interface;
int clk_enabled;
struct clk *tx_clk;
struct regulator *regulator;
};
#define SUN7I_GMAC_GMII_RGMII_RATE 125000000
#define SUN7I_GMAC_MII_RATE 25000000
static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
{
struct sunxi_priv_data *gmac = priv;
int ret;
if (gmac->regulator) {
ret = regulator_enable(gmac->regulator);
if (ret)
return ret;
}
/* Set GMAC interface port mode
*
* The GMAC TX clock lines are configured by setting the clock
* rate, which then uses the auto-reparenting feature of the
* clock driver, and enabling/disabling the clock.
*/
if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
clk_prepare_enable(gmac->tx_clk);
gmac->clk_enabled = 1;
} else {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
clk_prepare(gmac->tx_clk);
}
return 0;
}
static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
{
struct sunxi_priv_data *gmac = priv;
if (gmac->clk_enabled) {
clk_disable(gmac->tx_clk);
gmac->clk_enabled = 0;
}
clk_unprepare(gmac->tx_clk);
if (gmac->regulator)
regulator_disable(gmac->regulator);
}
static void sun7i_fix_speed(void *priv, unsigned int speed)
{
struct sunxi_priv_data *gmac = priv;
/* only GMII mode requires us to reconfigure the clock lines */
if (gmac->interface != PHY_INTERFACE_MODE_GMII)
return;
if (gmac->clk_enabled) {
clk_disable(gmac->tx_clk);
gmac->clk_enabled = 0;
}
clk_unprepare(gmac->tx_clk);
if (speed == 1000) {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
clk_prepare_enable(gmac->tx_clk);
gmac->clk_enabled = 1;
} else {
clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
clk_prepare(gmac->tx_clk);
}
}
static void *sun7i_gmac_setup(struct platform_device *pdev)
{
struct sunxi_priv_data *gmac;
struct device *dev = &pdev->dev;
gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
if (!gmac)
return ERR_PTR(-ENOMEM);
gmac->interface = of_get_phy_mode(dev->of_node);
gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
if (IS_ERR(gmac->tx_clk)) {
dev_err(dev, "could not get tx clock\n");
return gmac->tx_clk;
}
/* Optional regulator for PHY */
gmac->regulator = devm_regulator_get_optional(dev, "phy");
if (IS_ERR(gmac->regulator)) {
if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER)
return ERR_PTR(-EPROBE_DEFER);
dev_info(dev, "no regulator found\n");
gmac->regulator = NULL;
}
return gmac;
}
/* of_data specifying hardware features and callbacks.
* hardware features were copied from Allwinner drivers. */
static const struct stmmac_of_data sun7i_gmac_data = {
.has_gmac = 1,
.tx_coe = 1,
.fix_mac_speed = sun7i_fix_speed,
.setup = sun7i_gmac_setup,
.init = sun7i_gmac_init,
.exit = sun7i_gmac_exit,
};
static const struct of_device_id sun7i_dwmac_match[] = {
{ .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
{ }
};
MODULE_DEVICE_TABLE(of, sun7i_dwmac_match);
static struct platform_driver sun7i_dwmac_driver = {
.probe = stmmac_pltfr_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = "sun7i-dwmac",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = sun7i_dwmac_match,
},
};
module_platform_driver(sun7i_dwmac_driver);
MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer");
MODULE_LICENSE("GPL");
|
