1 /*
2  * Amlogic Meson 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 void *meson6_dwmac_setup(struct platform_device *pdev)
51 {
52 	struct meson_dwmac *dwmac;
53 	struct resource *res;
54 
55 	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
56 	if (!dwmac)
57 		return ERR_PTR(-ENOMEM);
58 
59 	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
60 	dwmac->reg = devm_ioremap_resource(&pdev->dev, res);
61 	if (IS_ERR(dwmac->reg))
62 		return ERR_CAST(dwmac->reg);
63 
64 	return dwmac;
65 }
66 
67 static const struct stmmac_of_data meson6_dwmac_data = {
68 	.setup		= meson6_dwmac_setup,
69 	.fix_mac_speed	= meson6_dwmac_fix_mac_speed,
70 };
71 
72 static const struct of_device_id meson6_dwmac_match[] = {
73 	{ .compatible = "amlogic,meson6-dwmac", .data = &meson6_dwmac_data},
74 	{ }
75 };
76 MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
77 
78 static struct platform_driver meson6_dwmac_driver = {
79 	.probe  = stmmac_pltfr_probe,
80 	.remove = stmmac_pltfr_remove,
81 	.driver = {
82 		.name           = "meson6-dwmac",
83 		.pm		= &stmmac_pltfr_pm_ops,
84 		.of_match_table = meson6_dwmac_match,
85 	},
86 };
87 module_platform_driver(meson6_dwmac_driver);
88 
89 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
90 MODULE_DESCRIPTION("Amlogic Meson DWMAC glue layer");
91 MODULE_LICENSE("GPL v2");
92