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
195
|
// SPDX-License-Identifier: GPL-2.0
/* Intel DWMAC platform driver
*
* Copyright(C) 2020 Intel Corporation
*/
#include <linux/ethtool.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/stmmac.h>
#include "dwmac4.h"
#include "stmmac.h"
#include "stmmac_platform.h"
struct intel_dwmac {
struct device *dev;
struct clk *tx_clk;
const struct intel_dwmac_data *data;
};
struct intel_dwmac_data {
void (*fix_mac_speed)(void *priv, unsigned int speed);
unsigned long ptp_ref_clk_rate;
unsigned long tx_clk_rate;
bool tx_clk_en;
};
static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed)
{
struct intel_dwmac *dwmac = priv;
unsigned long rate;
int ret;
rate = clk_get_rate(dwmac->tx_clk);
switch (speed) {
case SPEED_1000:
rate = 125000000;
break;
case SPEED_100:
rate = 25000000;
break;
case SPEED_10:
rate = 2500000;
break;
default:
dev_err(dwmac->dev, "Invalid speed\n");
break;
}
ret = clk_set_rate(dwmac->tx_clk, rate);
if (ret)
dev_err(dwmac->dev, "Failed to configure tx clock rate\n");
}
static const struct intel_dwmac_data kmb_data = {
.fix_mac_speed = kmb_eth_fix_mac_speed,
.ptp_ref_clk_rate = 200000000,
.tx_clk_rate = 125000000,
.tx_clk_en = true,
};
static const struct of_device_id intel_eth_plat_match[] = {
{ .compatible = "intel,keembay-dwmac", .data = &kmb_data },
{ }
};
MODULE_DEVICE_TABLE(of, intel_eth_plat_match);
static int intel_eth_plat_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
const struct of_device_id *match;
struct intel_dwmac *dwmac;
unsigned long rate;
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)) {
dev_err(&pdev->dev, "dt configuration failed\n");
return PTR_ERR(plat_dat);
}
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac) {
ret = -ENOMEM;
goto err_remove_config_dt;
}
dwmac->dev = &pdev->dev;
dwmac->tx_clk = NULL;
match = of_match_device(intel_eth_plat_match, &pdev->dev);
if (match && match->data) {
dwmac->data = (const struct intel_dwmac_data *)match->data;
if (dwmac->data->fix_mac_speed)
plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed;
/* Enable TX clock */
if (dwmac->data->tx_clk_en) {
dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
if (IS_ERR(dwmac->tx_clk)) {
ret = PTR_ERR(dwmac->tx_clk);
goto err_remove_config_dt;
}
clk_prepare_enable(dwmac->tx_clk);
/* Check and configure TX clock rate */
rate = clk_get_rate(dwmac->tx_clk);
if (dwmac->data->tx_clk_rate &&
rate != dwmac->data->tx_clk_rate) {
rate = dwmac->data->tx_clk_rate;
ret = clk_set_rate(dwmac->tx_clk, rate);
if (ret) {
dev_err(&pdev->dev,
"Failed to set tx_clk\n");
goto err_remove_config_dt;
}
}
}
/* Check and configure PTP ref clock rate */
rate = clk_get_rate(plat_dat->clk_ptp_ref);
if (dwmac->data->ptp_ref_clk_rate &&
rate != dwmac->data->ptp_ref_clk_rate) {
rate = dwmac->data->ptp_ref_clk_rate;
ret = clk_set_rate(plat_dat->clk_ptp_ref, rate);
if (ret) {
dev_err(&pdev->dev,
"Failed to set clk_ptp_ref\n");
goto err_remove_config_dt;
}
}
}
plat_dat->bsp_priv = dwmac;
plat_dat->eee_usecs_rate = plat_dat->clk_ptp_rate;
if (plat_dat->eee_usecs_rate > 0) {
u32 tx_lpi_usec;
tx_lpi_usec = (plat_dat->eee_usecs_rate / 1000000) - 1;
writel(tx_lpi_usec, stmmac_res.addr + GMAC_1US_TIC_COUNTER);
}
ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
if (ret) {
clk_disable_unprepare(dwmac->tx_clk);
goto err_remove_config_dt;
}
return 0;
err_remove_config_dt:
stmmac_remove_config_dt(pdev, plat_dat);
return ret;
}
static int intel_eth_plat_remove(struct platform_device *pdev)
{
struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
int ret;
ret = stmmac_pltfr_remove(pdev);
clk_disable_unprepare(dwmac->tx_clk);
return ret;
}
static struct platform_driver intel_eth_plat_driver = {
.probe = intel_eth_plat_probe,
.remove = intel_eth_plat_remove,
.driver = {
.name = "intel-eth-plat",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = intel_eth_plat_match,
},
};
module_platform_driver(intel_eth_plat_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel DWMAC platform driver");
|
