]> Git Repo - J-linux.git/blob - drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
Merge tag 'vfs-6.13-rc7.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs
[J-linux.git] / drivers / net / ethernet / stmicro / stmmac / dwmac-starfive.c
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * StarFive DWMAC platform driver
4  *
5  * Copyright (C) 2021 Emil Renner Berthing <[email protected]>
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         struct clk *clk_tx;
31         const struct starfive_dwmac_data *data;
32 };
33
34 static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
35 {
36         struct starfive_dwmac *dwmac = priv;
37         unsigned long rate;
38         int err;
39
40         rate = clk_get_rate(dwmac->clk_tx);
41
42         switch (speed) {
43         case SPEED_1000:
44                 rate = 125000000;
45                 break;
46         case SPEED_100:
47                 rate = 25000000;
48                 break;
49         case SPEED_10:
50                 rate = 2500000;
51                 break;
52         default:
53                 dev_err(dwmac->dev, "invalid speed %u\n", speed);
54                 break;
55         }
56
57         err = clk_set_rate(dwmac->clk_tx, rate);
58         if (err)
59                 dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
60 }
61
62 static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat)
63 {
64         struct starfive_dwmac *dwmac = plat_dat->bsp_priv;
65         struct regmap *regmap;
66         unsigned int args[2];
67         unsigned int mode;
68         int err;
69
70         switch (plat_dat->mac_interface) {
71         case PHY_INTERFACE_MODE_RMII:
72                 mode = STARFIVE_DWMAC_PHY_INFT_RMII;
73                 break;
74
75         case PHY_INTERFACE_MODE_RGMII:
76         case PHY_INTERFACE_MODE_RGMII_ID:
77         case PHY_INTERFACE_MODE_RGMII_RXID:
78         case PHY_INTERFACE_MODE_RGMII_TXID:
79                 mode = STARFIVE_DWMAC_PHY_INFT_RGMII;
80                 break;
81
82         default:
83                 dev_err(dwmac->dev, "unsupported interface %d\n",
84                         plat_dat->mac_interface);
85                 return -EINVAL;
86         }
87
88         regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node,
89                                                       "starfive,syscon",
90                                                       2, args);
91         if (IS_ERR(regmap))
92                 return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n");
93
94         /* args[0]:offset  args[1]: shift */
95         err = regmap_update_bits(regmap, args[0],
96                                  STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],
97                                  mode << args[1]);
98         if (err)
99                 return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");
100
101         if (dwmac->data) {
102                 err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN,
103                                    dwmac->data->gtxclk_dlychain);
104                 if (err)
105                         return dev_err_probe(dwmac->dev, err,
106                                              "error selecting gtxclk delay chain\n");
107         }
108
109         return 0;
110 }
111
112 static int starfive_dwmac_probe(struct platform_device *pdev)
113 {
114         struct plat_stmmacenet_data *plat_dat;
115         struct stmmac_resources stmmac_res;
116         struct starfive_dwmac *dwmac;
117         struct clk *clk_gtx;
118         int err;
119
120         err = stmmac_get_platform_resources(pdev, &stmmac_res);
121         if (err)
122                 return dev_err_probe(&pdev->dev, err,
123                                      "failed to get resources\n");
124
125         plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
126         if (IS_ERR(plat_dat))
127                 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
128                                      "dt configuration failed\n");
129
130         dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
131         if (!dwmac)
132                 return -ENOMEM;
133
134         dwmac->data = device_get_match_data(&pdev->dev);
135
136         dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
137         if (IS_ERR(dwmac->clk_tx))
138                 return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
139                                      "error getting tx clock\n");
140
141         clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
142         if (IS_ERR(clk_gtx))
143                 return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
144                                      "error getting gtx clock\n");
145
146         /* Generally, the rgmii_tx clock is provided by the internal clock,
147          * which needs to match the corresponding clock frequency according
148          * to different speeds. If the rgmii_tx clock is provided by the
149          * external rgmii_rxin, there is no need to configure the clock
150          * internally, because rgmii_rxin will be adaptively adjusted.
151          */
152         if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
153                 plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed;
154
155         dwmac->dev = &pdev->dev;
156         plat_dat->bsp_priv = dwmac;
157         plat_dat->dma_cfg->dche = true;
158
159         err = starfive_dwmac_set_mode(plat_dat);
160         if (err)
161                 return err;
162
163         return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
164 }
165
166 static const struct starfive_dwmac_data jh7100_data = {
167         .gtxclk_dlychain = 4,
168 };
169
170 static const struct of_device_id starfive_dwmac_match[] = {
171         { .compatible = "starfive,jh7100-dwmac", .data = &jh7100_data },
172         { .compatible = "starfive,jh7110-dwmac" },
173         { /* sentinel */ }
174 };
175 MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
176
177 static struct platform_driver starfive_dwmac_driver = {
178         .probe  = starfive_dwmac_probe,
179         .remove = stmmac_pltfr_remove,
180         .driver = {
181                 .name = "starfive-dwmac",
182                 .pm = &stmmac_pltfr_pm_ops,
183                 .of_match_table = starfive_dwmac_match,
184         },
185 };
186 module_platform_driver(starfive_dwmac_driver);
187
188 MODULE_LICENSE("GPL");
189 MODULE_DESCRIPTION("StarFive DWMAC platform driver");
190 MODULE_AUTHOR("Emil Renner Berthing <[email protected]>");
191 MODULE_AUTHOR("Samin Guo <[email protected]>");
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