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 = devm_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 return -ENOMEM;
62
63 dwmac->reg = devm_platform_ioremap_resource(pdev, 1);
64 if (IS_ERR(dwmac->reg))
65 return PTR_ERR(dwmac->reg);
66
67 plat_dat->bsp_priv = dwmac;
68 plat_dat->fix_mac_speed = meson6_dwmac_fix_mac_speed;
69
70 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
71 }
72
73 static const struct of_device_id meson6_dwmac_match[] = {
74 { .compatible = "amlogic,meson6-dwmac" },
75 { }
76 };
77 MODULE_DEVICE_TABLE(of, meson6_dwmac_match);
78
79 static struct platform_driver meson6_dwmac_driver = {
80 .probe = meson6_dwmac_probe,
81 .remove_new = stmmac_pltfr_remove,
82 .driver = {
83 .name = "meson6-dwmac",
84 .pm = &stmmac_pltfr_pm_ops,
85 .of_match_table = meson6_dwmac_match,
86 },
87 };
88 module_platform_driver(meson6_dwmac_driver);
89
90 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
91 MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
92 MODULE_LICENSE("GPL v2");
93