1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * StarFive DWMAC platform driver
4 *
5 * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
6 * Copyright (C) 2022 StarFive Technology Co., Ltd.
7 *
8 */
9
10#include <linux/mod_devicetable.h>
11#include <linux/platform_device.h>
12#include <linux/property.h>
13#include <linux/mfd/syscon.h>
14#include <linux/regmap.h>
15
16#include "stmmac_platform.h"
17
18#define STARFIVE_DWMAC_PHY_INFT_RGMII	0x1
19#define STARFIVE_DWMAC_PHY_INFT_RMII	0x4
20#define STARFIVE_DWMAC_PHY_INFT_FIELD	0x7U
21
22struct starfive_dwmac {
23	struct device *dev;
24	struct clk *clk_tx;
25};
26
27static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
28{
29	struct starfive_dwmac *dwmac = priv;
30	unsigned long rate;
31	int err;
32
33	rate = clk_get_rate(dwmac->clk_tx);
34
35	switch (speed) {
36	case SPEED_1000:
37		rate = 125000000;
38		break;
39	case SPEED_100:
40		rate = 25000000;
41		break;
42	case SPEED_10:
43		rate = 2500000;
44		break;
45	default:
46		dev_err(dwmac->dev, "invalid speed %u\n", speed);
47		break;
48	}
49
50	err = clk_set_rate(dwmac->clk_tx, rate);
51	if (err)
52		dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
53}
54
55static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat)
56{
57	struct starfive_dwmac *dwmac = plat_dat->bsp_priv;
58	struct regmap *regmap;
59	unsigned int args[2];
60	unsigned int mode;
61	int err;
62
63	switch (plat_dat->mac_interface) {
64	case PHY_INTERFACE_MODE_RMII:
65		mode = STARFIVE_DWMAC_PHY_INFT_RMII;
66		break;
67
68	case PHY_INTERFACE_MODE_RGMII:
69	case PHY_INTERFACE_MODE_RGMII_ID:
70		mode = STARFIVE_DWMAC_PHY_INFT_RGMII;
71		break;
72
73	default:
74		dev_err(dwmac->dev, "unsupported interface %d\n",
75			plat_dat->mac_interface);
76		return -EINVAL;
77	}
78
79	regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node,
80						      "starfive,syscon",
81						      2, args);
82	if (IS_ERR(regmap))
83		return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n");
84
85	/* args[0]:offset  args[1]: shift */
86	err = regmap_update_bits(regmap, args[0],
87				 STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],
88				 mode << args[1]);
89	if (err)
90		return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");
91
92	return 0;
93}
94
95static int starfive_dwmac_probe(struct platform_device *pdev)
96{
97	struct plat_stmmacenet_data *plat_dat;
98	struct stmmac_resources stmmac_res;
99	struct starfive_dwmac *dwmac;
100	struct clk *clk_gtx;
101	int err;
102
103	err = stmmac_get_platform_resources(pdev, &stmmac_res);
104	if (err)
105		return dev_err_probe(&pdev->dev, err,
106				     "failed to get resources\n");
107
108	plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
109	if (IS_ERR(plat_dat))
110		return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
111				     "dt configuration failed\n");
112
113	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
114	if (!dwmac)
115		return -ENOMEM;
116
117	dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
118	if (IS_ERR(dwmac->clk_tx))
119		return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
120				     "error getting tx clock\n");
121
122	clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
123	if (IS_ERR(clk_gtx))
124		return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
125				     "error getting gtx clock\n");
126
127	/* Generally, the rgmii_tx clock is provided by the internal clock,
128	 * which needs to match the corresponding clock frequency according
129	 * to different speeds. If the rgmii_tx clock is provided by the
130	 * external rgmii_rxin, there is no need to configure the clock
131	 * internally, because rgmii_rxin will be adaptively adjusted.
132	 */
133	if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
134		plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed;
135
136	dwmac->dev = &pdev->dev;
137	plat_dat->bsp_priv = dwmac;
138	plat_dat->dma_cfg->dche = true;
139
140	err = starfive_dwmac_set_mode(plat_dat);
141	if (err)
142		return err;
143
144	err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
145	if (err) {
146		stmmac_remove_config_dt(pdev, plat_dat);
147		return err;
148	}
149
150	return 0;
151}
152
153static const struct of_device_id starfive_dwmac_match[] = {
154	{ .compatible = "starfive,jh7110-dwmac"	},
155	{ /* sentinel */ }
156};
157MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
158
159static struct platform_driver starfive_dwmac_driver = {
160	.probe  = starfive_dwmac_probe,
161	.remove_new = stmmac_pltfr_remove,
162	.driver = {
163		.name = "starfive-dwmac",
164		.pm = &stmmac_pltfr_pm_ops,
165		.of_match_table = starfive_dwmac_match,
166	},
167};
168module_platform_driver(starfive_dwmac_driver);
169
170MODULE_LICENSE("GPL");
171MODULE_DESCRIPTION("StarFive DWMAC platform driver");
172MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
173MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");
174