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
20struct meson_dwmac {
21	struct device	*dev;
22	void __iomem	*reg;
23};
24
25static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed)
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
44static 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
80err_remove_config_dt:
81	stmmac_remove_config_dt(pdev, plat_dat);
82
83	return ret;
84}
85
86static const struct of_device_id meson6_dwmac_match[] = {
87	{ .compatible = "amlogic,meson6-dwmac" },
88	{ }
89};
90MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
91
92static struct platform_driver meson6_dwmac_driver = {
93	.probe  = meson6_dwmac_probe,
94	.remove = stmmac_pltfr_remove,
95	.driver = {
96		.name           = "meson6-dwmac",
97		.pm		= &stmmac_pltfr_pm_ops,
98		.of_match_table = meson6_dwmac_match,
99	},
100};
101module_platform_driver(meson6_dwmac_driver);
102
103MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
104MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
105MODULE_LICENSE("GPL v2");
106