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
lpc18xx_dwmac_probe(struct platform_device * pdev)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 = 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->mac_interface = PHY_INTERFACE_MODE_NA;
45 plat_dat->has_gmac = true;
46
47 reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
48 if (IS_ERR(reg)) {
49 dev_err(&pdev->dev, "syscon lookup failed\n");
50 return PTR_ERR(reg);
51 }
52
53 if (plat_dat->phy_interface == PHY_INTERFACE_MODE_MII) {
54 ethmode = LPC18XX_CREG_CREG6_ETHMODE_MII;
55 } else if (plat_dat->phy_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 return -EINVAL;
60 }
61
62 regmap_update_bits(reg, LPC18XX_CREG_CREG6,
63 LPC18XX_CREG_CREG6_ETHMODE_MASK, ethmode);
64
65 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
66 }
67
68 static const struct of_device_id lpc18xx_dwmac_match[] = {
69 { .compatible = "nxp,lpc1850-dwmac" },
70 { }
71 };
72 MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);
73
74 static struct platform_driver lpc18xx_dwmac_driver = {
75 .probe = lpc18xx_dwmac_probe,
76 .remove = stmmac_pltfr_remove,
77 .driver = {
78 .name = "lpc18xx-dwmac",
79 .pm = &stmmac_pltfr_pm_ops,
80 .of_match_table = lpc18xx_dwmac_match,
81 },
82 };
83 module_platform_driver(lpc18xx_dwmac_driver);
84
85 MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
86 MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
87 MODULE_LICENSE("GPL v2");
88