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
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
|
/*
* dwmac-stm32.c - DWMAC Specific Glue layer for STM32 MCU
*
* Copyright (C) Alexandre Torgue 2015
* Author: Alexandre Torgue <alexandre.torgue@gmail.com>
* License terms: GNU General Public License (GPL), version 2
*
*/
#include <linux/clk.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/stmmac.h>
#include "stmmac_platform.h"
#define MII_PHY_SEL_MASK BIT(23)
struct stm32_dwmac {
struct clk *clk_tx;
struct clk *clk_rx;
u32 mode_reg; /* MAC glue-logic mode register */
struct regmap *regmap;
u32 speed;
};
static int stm32_dwmac_init(struct plat_stmmacenet_data *plat_dat)
{
struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
u32 reg = dwmac->mode_reg;
u32 val;
int ret;
val = (plat_dat->interface == PHY_INTERFACE_MODE_MII) ? 0 : 1;
ret = regmap_update_bits(dwmac->regmap, reg, MII_PHY_SEL_MASK, val);
if (ret)
return ret;
ret = clk_prepare_enable(dwmac->clk_tx);
if (ret)
return ret;
ret = clk_prepare_enable(dwmac->clk_rx);
if (ret)
clk_disable_unprepare(dwmac->clk_tx);
return ret;
}
static void stm32_dwmac_clk_disable(struct stm32_dwmac *dwmac)
{
clk_disable_unprepare(dwmac->clk_tx);
clk_disable_unprepare(dwmac->clk_rx);
}
static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
struct device *dev)
{
struct device_node *np = dev->of_node;
int err;
/* Get TX/RX clocks */
dwmac->clk_tx = devm_clk_get(dev, "mac-clk-tx");
if (IS_ERR(dwmac->clk_tx)) {
dev_err(dev, "No tx clock provided...\n");
return PTR_ERR(dwmac->clk_tx);
}
dwmac->clk_rx = devm_clk_get(dev, "mac-clk-rx");
if (IS_ERR(dwmac->clk_rx)) {
dev_err(dev, "No rx clock provided...\n");
return PTR_ERR(dwmac->clk_rx);
}
/* Get mode register */
dwmac->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
if (IS_ERR(dwmac->regmap))
return PTR_ERR(dwmac->regmap);
err = of_property_read_u32_index(np, "st,syscon", 1, &dwmac->mode_reg);
if (err)
dev_err(dev, "Can't get sysconfig mode offset (%d)\n", err);
return err;
}
static int stm32_dwmac_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct stm32_dwmac *dwmac;
int ret;
ret = stmmac_get_platform_resources(pdev, &stmmac_res);
if (ret)
return ret;
plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
if (IS_ERR(plat_dat))
return PTR_ERR(plat_dat);
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac)
return -ENOMEM;
ret = stm32_dwmac_parse_data(dwmac, &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "Unable to parse OF data\n");
return ret;
}
plat_dat->bsp_priv = dwmac;
ret = stm32_dwmac_init(plat_dat);
if (ret)
return ret;
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret)
stm32_dwmac_clk_disable(dwmac);
return ret;
}
static int stm32_dwmac_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct stmmac_priv *priv = netdev_priv(ndev);
int ret = stmmac_dvr_remove(&pdev->dev);
stm32_dwmac_clk_disable(priv->plat->bsp_priv);
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int stm32_dwmac_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct stmmac_priv *priv = netdev_priv(ndev);
int ret;
ret = stmmac_suspend(dev);
stm32_dwmac_clk_disable(priv->plat->bsp_priv);
return ret;
}
static int stm32_dwmac_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct stmmac_priv *priv = netdev_priv(ndev);
int ret;
ret = stm32_dwmac_init(priv->plat);
if (ret)
return ret;
ret = stmmac_resume(dev);
return ret;
}
#endif /* CONFIG_PM_SLEEP */
static SIMPLE_DEV_PM_OPS(stm32_dwmac_pm_ops,
stm32_dwmac_suspend, stm32_dwmac_resume);
static const struct of_device_id stm32_dwmac_match[] = {
{ .compatible = "st,stm32-dwmac"},
{ }
};
MODULE_DEVICE_TABLE(of, stm32_dwmac_match);
static struct platform_driver stm32_dwmac_driver = {
.probe = stm32_dwmac_probe,
.remove = stm32_dwmac_remove,
.driver = {
.name = "stm32-dwmac",
.pm = &stm32_dwmac_pm_ops,
.of_match_table = stm32_dwmac_match,
},
};
module_platform_driver(stm32_dwmac_driver);
MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@gmail.com>");
MODULE_DESCRIPTION("STMicroelectronics MCU DWMAC Specific Glue layer");
MODULE_LICENSE("GPL v2");
|
