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 struct lpc18xx_dwmac_priv_data {
29 	struct regmap *reg;
30 	int interface;
31 };
32 
33 static void *lpc18xx_dwmac_setup(struct platform_device *pdev)
34 {
35 	struct lpc18xx_dwmac_priv_data *dwmac;
36 
37 	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
38 	if (!dwmac)
39 		return ERR_PTR(-ENOMEM);
40 
41 	dwmac->interface = of_get_phy_mode(pdev->dev.of_node);
42 	if (dwmac->interface < 0)
43 		return ERR_PTR(dwmac->interface);
44 
45 	dwmac->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
46 	if (IS_ERR(dwmac->reg)) {
47 		dev_err(&pdev->dev, "Syscon lookup failed\n");
48 		return dwmac->reg;
49 	}
50 
51 	return dwmac;
52 }
53 
54 static int lpc18xx_dwmac_init(struct platform_device *pdev, void *priv)
55 {
56 	struct lpc18xx_dwmac_priv_data *dwmac = priv;
57 	u8 ethmode;
58 
59 	if (dwmac->interface == PHY_INTERFACE_MODE_MII) {
60 		ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
61 	} else if (dwmac->interface == PHY_INTERFACE_MODE_RMII) {
62 		ethmode = LPC18XX_CREG_CREG6_ETHMODE_RMII;
63 	} else {
64 		dev_err(&pdev->dev, "Only MII and RMII mode supported\n");
65 		return -EINVAL;
66 	}
67 
68 	regmap_update_bits(dwmac->reg, LPC18XX_CREG_CREG6,
69 			   LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
70 
71 	return 0;
72 }
73 
74 static const struct stmmac_of_data lpc18xx_dwmac_data = {
75 	.has_gmac = 1,
76 	.setup = lpc18xx_dwmac_setup,
77 	.init = lpc18xx_dwmac_init,
78 };
79 
80 static const struct of_device_id lpc18xx_dwmac_match[] = {
81 	{ .compatible = "nxp,lpc1850-dwmac", .data = &lpc18xx_dwmac_data },
82 	{ }
83 };
84 MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
85 
86 static struct platform_driver lpc18xx_dwmac_driver = {
87 	.probe  = stmmac_pltfr_probe,
88 	.remove = stmmac_pltfr_remove,
89 	.driver = {
90 		.name           = "lpc18xx-dwmac",
91 		.pm		= &stmmac_pltfr_pm_ops,
92 		.of_match_table = lpc18xx_dwmac_match,
93 	},
94 };
95 module_platform_driver(lpc18xx_dwmac_driver);
96 
97 MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
98 MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
99 MODULE_LICENSE("GPL v2");
100