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 = devm_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		return PTR_ERR(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(reg, LPC18XX_CREG_CREG6,
62			   LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
63
64	return stmmac_dvr_probe(&pdev->dev, plat_dat, &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