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 
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 
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