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);
37	if (ret)
38		return ret;
39
40	plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
41	if (IS_ERR(plat_dat))
42		return PTR_ERR(plat_dat);
43
44	plat_dat->has_gmac = true;
45
46	reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
47	if (IS_ERR(reg)) {
48		dev_err(&pdev->dev, "syscon lookup failed\n");
49		ret = PTR_ERR(reg);
50		goto err_remove_config_dt;
51	}
52
53	if (plat_dat->interface == PHY_INTERFACE_MODE_MII) {
54		ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
55	} else if (plat_dat->interface == PHY_INTERFACE_MODE_RMII) {
56		ethmode = LPC18XX_CREG_CREG6_ETHMODE_RMII;
57	} else {
58		dev_err(&pdev->dev, "Only MII and RMII mode supported\n");
59		ret = -EINVAL;
60		goto err_remove_config_dt;
61	}
62
63	regmap_update_bits(reg, LPC18XX_CREG_CREG6,
64			   LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
65
66	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
67	if (ret)
68		goto err_remove_config_dt;
69
70	return 0;
71
72err_remove_config_dt:
73	stmmac_remove_config_dt(pdev, plat_dat);
74
75	return ret;
76}
77
78static const struct of_device_id lpc18xx_dwmac_match[] = {
79	{ .compatible = "nxp,lpc1850-dwmac" },
80	{ }
81};
82MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
83
84static struct platform_driver lpc18xx_dwmac_driver = {
85	.probe  = lpc18xx_dwmac_probe,
86	.remove = stmmac_pltfr_remove,
87	.driver = {
88		.name           = "lpc18xx-dwmac",
89		.pm		= &stmmac_pltfr_pm_ops,
90		.of_match_table = lpc18xx_dwmac_match,
91	},
92};
93module_platform_driver(lpc18xx_dwmac_driver);
94
95MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
96MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
97MODULE_LICENSE("GPL v2");
98