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 
28 static 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 
72 err_remove_config_dt:
73 	stmmac_remove_config_dt(pdev, plat_dat);
74 
75 	return ret;
76 }
77 
78 static const struct of_device_id lpc18xx_dwmac_match[] = {
79 	{ .compatible = "nxp,lpc1850-dwmac" },
80 	{ }
81 };
82 MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
83 
84 static 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 };
93 module_platform_driver(lpc18xx_dwmac_driver);
94 
95 MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
96 MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
97 MODULE_LICENSE("GPL v2");
98