1/*
2 * DWMAC glue for NXP LPC18xx/LPC43xx Ethernet
3 *
4 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
5 *
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
9 */
10
11#include <linux/mfd/syscon.h>
12#include <linux/module.h>
13#include <linux/of.h>
14#include <linux/of_net.h>
15#include <linux/phy.h>
16#include <linux/platform_device.h>
17#include <linux/regmap.h>
18#include <linux/stmmac.h>
19
20#include "stmmac_platform.h"
21
22/* Register defines for CREG syscon */
23#define LPC18XX_CREG_CREG6 0x12c
24# define LPC18XX_CREG_CREG6_ETHMODE_MASK 0x7
25# define LPC18XX_CREG_CREG6_ETHMODE_MII 0x0
26# define LPC18XX_CREG_CREG6_ETHMODE_RMII 0x4
27
28static int lpc18xx_dwmac_probe(struct platform_device *pdev)
29{
30 struct plat_stmmacenet_data *plat_dat;
31 struct stmmac_resources stmmac_res;
32 struct regmap *reg;
33 u8 ethmode;
34 int ret;
35
36 ret = stmmac_get_platform_resources(pdev, stmmac_res: &stmmac_res);
37 if (ret)
38 return ret;
39
40 plat_dat = devm_stmmac_probe_config_dt(pdev, mac: stmmac_res.mac);
41 if (IS_ERR(ptr: plat_dat))
42 return PTR_ERR(ptr: plat_dat);
43
44 plat_dat->has_gmac = true;
45
46 reg = syscon_regmap_lookup_by_compatible(s: "nxp,lpc1850-creg");
47 if (IS_ERR(ptr: reg)) {
48 dev_err(&pdev->dev, "syscon lookup failed\n");
49 return PTR_ERR(ptr: reg);
50 }
51
52 if (plat_dat->mac_interface == PHY_INTERFACE_MODE_MII) {
53 ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
54 } else if (plat_dat->mac_interface == PHY_INTERFACE_MODE_RMII) {
55 ethmode = LPC18XX_CREG_CREG6_ETHMODE_RMII;
56 } else {
57 dev_err(&pdev->dev, "Only MII and RMII mode supported\n");
58 return -EINVAL;
59 }
60
61 regmap_update_bits(map: reg, LPC18XX_CREG_CREG6,
62 LPC18XX_CREG_CREG6_ETHMODE_MASK, val: ethmode);
63
64 return stmmac_dvr_probe(device: &pdev->dev, plat_dat, res: &stmmac_res);
65}
66
67static const struct of_device_id lpc18xx_dwmac_match[] = {
68 { .compatible = "nxp,lpc1850-dwmac" },
69 { }
70};
71MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
72
73static struct platform_driver lpc18xx_dwmac_driver = {
74 .probe = lpc18xx_dwmac_probe,
75 .remove_new = stmmac_pltfr_remove,
76 .driver = {
77 .name = "lpc18xx-dwmac",
78 .pm = &stmmac_pltfr_pm_ops,
79 .of_match_table = lpc18xx_dwmac_match,
80 },
81};
82module_platform_driver(lpc18xx_dwmac_driver);
83
84MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
85MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
86MODULE_LICENSE("GPL v2");
87

source code of linux/drivers/net/ethernet/stmicro/stmmac/dwmac-lpc18xx.c