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 #define JH7100_SYSMAIN_REGISTER49_DLYCHAIN 0xc8
23
24 struct starfive_dwmac_data {
25 unsigned int gtxclk_dlychain;
26 };
27
28 struct starfive_dwmac {
29 struct device *dev;
30 const struct starfive_dwmac_data *data;
31 };
32
starfive_dwmac_set_mode(struct plat_stmmacenet_data * plat_dat)33 static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat)
34 {
35 struct starfive_dwmac *dwmac = plat_dat->bsp_priv;
36 struct regmap *regmap;
37 unsigned int args[2];
38 unsigned int mode;
39 int err;
40
41 switch (plat_dat->mac_interface) {
42 case PHY_INTERFACE_MODE_RMII:
43 mode = STARFIVE_DWMAC_PHY_INFT_RMII;
44 break;
45
46 case PHY_INTERFACE_MODE_RGMII:
47 case PHY_INTERFACE_MODE_RGMII_ID:
48 case PHY_INTERFACE_MODE_RGMII_RXID:
49 case PHY_INTERFACE_MODE_RGMII_TXID:
50 mode = STARFIVE_DWMAC_PHY_INFT_RGMII;
51 break;
52
53 default:
54 dev_err(dwmac->dev, "unsupported interface %d\n",
55 plat_dat->mac_interface);
56 return -EINVAL;
57 }
58
59 regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node,
60 "starfive,syscon",
61 2, args);
62 if (IS_ERR(regmap))
63 return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n");
64
65 /* args[0]:offset args[1]: shift */
66 err = regmap_update_bits(regmap, args[0],
67 STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],
68 mode << args[1]);
69 if (err)
70 return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");
71
72 if (dwmac->data) {
73 err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN,
74 dwmac->data->gtxclk_dlychain);
75 if (err)
76 return dev_err_probe(dwmac->dev, err,
77 "error selecting gtxclk delay chain\n");
78 }
79
80 return 0;
81 }
82
starfive_dwmac_probe(struct platform_device * pdev)83 static int starfive_dwmac_probe(struct platform_device *pdev)
84 {
85 struct plat_stmmacenet_data *plat_dat;
86 struct stmmac_resources stmmac_res;
87 struct starfive_dwmac *dwmac;
88 struct clk *clk_gtx;
89 int err;
90
91 err = stmmac_get_platform_resources(pdev, &stmmac_res);
92 if (err)
93 return dev_err_probe(&pdev->dev, err,
94 "failed to get resources\n");
95
96 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
97 if (IS_ERR(plat_dat))
98 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
99 "dt configuration failed\n");
100
101 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
102 if (!dwmac)
103 return -ENOMEM;
104
105 dwmac->data = device_get_match_data(&pdev->dev);
106
107 plat_dat->clk_tx_i = devm_clk_get_enabled(&pdev->dev, "tx");
108 if (IS_ERR(plat_dat->clk_tx_i))
109 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat->clk_tx_i),
110 "error getting tx clock\n");
111
112 clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
113 if (IS_ERR(clk_gtx))
114 return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
115 "error getting gtx clock\n");
116
117 /* Generally, the rgmii_tx clock is provided by the internal clock,
118 * which needs to match the corresponding clock frequency according
119 * to different speeds. If the rgmii_tx clock is provided by the
120 * external rgmii_rxin, there is no need to configure the clock
121 * internally, because rgmii_rxin will be adaptively adjusted.
122 */
123 if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
124 plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
125
126 dwmac->dev = &pdev->dev;
127 plat_dat->flags |= STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP;
128 plat_dat->bsp_priv = dwmac;
129 plat_dat->dma_cfg->dche = true;
130
131 err = starfive_dwmac_set_mode(plat_dat);
132 if (err)
133 return err;
134
135 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
136 }
137
138 static const struct starfive_dwmac_data jh7100_data = {
139 .gtxclk_dlychain = 4,
140 };
141
142 static const struct of_device_id starfive_dwmac_match[] = {
143 { .compatible = "starfive,jh7100-dwmac", .data = &jh7100_data },
144 { .compatible = "starfive,jh7110-dwmac" },
145 { /* sentinel */ }
146 };
147 MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
148
149 static struct platform_driver starfive_dwmac_driver = {
150 .probe = starfive_dwmac_probe,
151 .remove = stmmac_pltfr_remove,
152 .driver = {
153 .name = "starfive-dwmac",
154 .pm = &stmmac_pltfr_pm_ops,
155 .of_match_table = starfive_dwmac_match,
156 },
157 };
158 module_platform_driver(starfive_dwmac_driver);
159
160 MODULE_LICENSE("GPL");
161 MODULE_DESCRIPTION("StarFive DWMAC platform driver");
162 MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
163 MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");
164