1 /*
2 * Amlogic Meson6 and Meson8 DWMAC glue layer
3 *
4 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * You should have received a copy of the GNU General Public License
11 * along with this program. If not, see <http://www.gnu.org/licenses/>.
12 */
13
14 #include <linux/device.h>
15 #include <linux/ethtool.h>
16 #include <linux/io.h>
17 #include <linux/ioport.h>
18 #include <linux/module.h>
19 #include <linux/platform_device.h>
20 #include <linux/stmmac.h>
21
22 #include "stmmac_platform.h"
23
24 #define ETHMAC_SPEED_100 BIT(1)
25
26 struct meson_dwmac {
27 struct device *dev;
28 void __iomem *reg;
29 };
30
meson6_dwmac_fix_mac_speed(void * priv,unsigned int speed)31 static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed)
32 {
33 struct meson_dwmac *dwmac = priv;
34 unsigned int val;
35
36 val = readl(dwmac->reg);
37
38 switch (speed) {
39 case SPEED_10:
40 val &= ~ETHMAC_SPEED_100;
41 break;
42 case SPEED_100:
43 val |= ETHMAC_SPEED_100;
44 break;
45 }
46
47 writel(val, dwmac->reg);
48 }
49
meson6_dwmac_probe(struct platform_device * pdev)50 static int meson6_dwmac_probe(struct platform_device *pdev)
51 {
52 struct plat_stmmacenet_data *plat_dat;
53 struct stmmac_resources stmmac_res;
54 struct meson_dwmac *dwmac;
55 struct resource *res;
56 int ret;
57
58 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
59 if (ret)
60 return ret;
61
62 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
63 if (IS_ERR(plat_dat))
64 return PTR_ERR(plat_dat);
65
66 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
67 if (!dwmac) {
68 ret = -ENOMEM;
69 goto err_remove_config_dt;
70 }
71
72 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
73 dwmac->reg = devm_ioremap_resource(&pdev->dev, res);
74 if (IS_ERR(dwmac->reg)) {
75 ret = PTR_ERR(dwmac->reg);
76 goto err_remove_config_dt;
77 }
78
79 plat_dat->bsp_priv = dwmac;
80 plat_dat->fix_mac_speed = meson6_dwmac_fix_mac_speed;
81
82 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
83 if (ret)
84 goto err_remove_config_dt;
85
86 return 0;
87
88 err_remove_config_dt:
89 stmmac_remove_config_dt(pdev, plat_dat);
90
91 return ret;
92 }
93
94 static const struct of_device_id meson6_dwmac_match[] = {
95 { .compatible = "amlogic,meson6-dwmac" },
96 { }
97 };
98 MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
99
100 static struct platform_driver meson6_dwmac_driver = {
101 .probe = meson6_dwmac_probe,
102 .remove = stmmac_pltfr_remove,
103 .driver = {
104 .name = "meson6-dwmac",
105 .pm = &stmmac_pltfr_pm_ops,
106 .of_match_table = meson6_dwmac_match,
107 },
108 };
109 module_platform_driver(meson6_dwmac_driver);
110
111 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
112 MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
113 MODULE_LICENSE("GPL v2");
114