1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Amlogic Meson6 and Meson8 DWMAC glue layer
4 *
5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
6 */
7
8 #include <linux/device.h>
9 #include <linux/ethtool.h>
10 #include <linux/io.h>
11 #include <linux/ioport.h>
12 #include <linux/module.h>
13 #include <linux/platform_device.h>
14 #include <linux/stmmac.h>
15
16 #include "stmmac_platform.h"
17
18 #define ETHMAC_SPEED_100 BIT(1)
19
20 struct meson_dwmac {
21 struct device *dev;
22 void __iomem *reg;
23 };
24
meson6_dwmac_fix_mac_speed(void * priv,unsigned int speed,unsigned int mode)25 static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
26 {
27 struct meson_dwmac *dwmac = priv;
28 unsigned int val;
29
30 val = readl(dwmac->reg);
31
32 switch (speed) {
33 case SPEED_10:
34 val &= ~ETHMAC_SPEED_100;
35 break;
36 case SPEED_100:
37 val |= ETHMAC_SPEED_100;
38 break;
39 }
40
41 writel(val, dwmac->reg);
42 }
43
meson6_dwmac_probe(struct platform_device * pdev)44 static int meson6_dwmac_probe(struct platform_device *pdev)
45 {
46 struct plat_stmmacenet_data *plat_dat;
47 struct stmmac_resources stmmac_res;
48 struct meson_dwmac *dwmac;
49 int ret;
50
51 ret = stmmac_get_platform_resources(pdev, &stmmac_res);
52 if (ret)
53 return ret;
54
55 plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
56 if (IS_ERR(plat_dat))
57 return PTR_ERR(plat_dat);
58
59 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
60 if (!dwmac) {
61 ret = -ENOMEM;
62 goto err_remove_config_dt;
63 }
64
65 dwmac->reg = devm_platform_ioremap_resource(pdev, 1);
66 if (IS_ERR(dwmac->reg)) {
67 ret = PTR_ERR(dwmac->reg);
68 goto err_remove_config_dt;
69 }
70
71 plat_dat->bsp_priv = dwmac;
72 plat_dat->fix_mac_speed = meson6_dwmac_fix_mac_speed;
73
74 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
75 if (ret)
76 goto err_remove_config_dt;
77
78 return 0;
79
80 err_remove_config_dt:
81 stmmac_remove_config_dt(pdev, plat_dat);
82
83 return ret;
84 }
85
86 static const struct of_device_id meson6_dwmac_match[] = {
87 { .compatible = "amlogic,meson6-dwmac" },
88 { }
89 };
90 MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
91
92 static struct platform_driver meson6_dwmac_driver = {
93 .probe = meson6_dwmac_probe,
94 .remove_new = stmmac_pltfr_remove,
95 .driver = {
96 .name = "meson6-dwmac",
97 .pm = &stmmac_pltfr_pm_ops,
98 .of_match_table = meson6_dwmac_match,
99 },
100 };
101 module_platform_driver(meson6_dwmac_driver);
102
103 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
104 MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
105 MODULE_LICENSE("GPL v2");
106
