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 
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 
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