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
22 struct starfive_dwmac {
23 struct device *dev;
24 struct clk *clk_tx;
25 };
26
starfive_dwmac_fix_mac_speed(void * priv,unsigned int speed,unsigned int mode)27 static 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
starfive_dwmac_set_mode(struct plat_stmmacenet_data * plat_dat)55 static 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
starfive_dwmac_probe(struct platform_device * pdev)95 static 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
153 static const struct of_device_id starfive_dwmac_match[] = {
154 { .compatible = "starfive,jh7110-dwmac" },
155 { /* sentinel */ }
156 };
157 MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
158
159 static 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 };
168 module_platform_driver(starfive_dwmac_driver);
169
170 MODULE_LICENSE("GPL");
171 MODULE_DESCRIPTION("StarFive DWMAC platform driver");
172 MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
173 MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");
174
