1 // SPDX-License-Identifier: GPL-2.0
2 /* Intel DWMAC platform driver
3  *
4  * Copyright(C) 2020 Intel Corporation
5  */
6 
7 #include <linux/ethtool.h>
8 #include <linux/module.h>
9 #include <linux/of.h>
10 #include <linux/of_device.h>
11 #include <linux/platform_device.h>
12 #include <linux/stmmac.h>
13 
14 #include "dwmac4.h"
15 #include "stmmac.h"
16 #include "stmmac_platform.h"
17 
18 struct intel_dwmac {
19 	struct device *dev;
20 	struct clk *tx_clk;
21 	const struct intel_dwmac_data *data;
22 };
23 
24 struct intel_dwmac_data {
25 	void (*fix_mac_speed)(void *priv, unsigned int speed, unsigned int mode);
26 	unsigned long ptp_ref_clk_rate;
27 	unsigned long tx_clk_rate;
28 	bool tx_clk_en;
29 };
30 
31 static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
32 {
33 	struct intel_dwmac *dwmac = priv;
34 	unsigned long rate;
35 	int ret;
36 
37 	rate = clk_get_rate(dwmac->tx_clk);
38 
39 	switch (speed) {
40 	case SPEED_1000:
41 		rate = 125000000;
42 		break;
43 
44 	case SPEED_100:
45 		rate = 25000000;
46 		break;
47 
48 	case SPEED_10:
49 		rate = 2500000;
50 		break;
51 
52 	default:
53 		dev_err(dwmac->dev, "Invalid speed\n");
54 		break;
55 	}
56 
57 	ret = clk_set_rate(dwmac->tx_clk, rate);
58 	if (ret)
59 		dev_err(dwmac->dev, "Failed to configure tx clock rate\n");
60 }
61 
62 static const struct intel_dwmac_data kmb_data = {
63 	.fix_mac_speed = kmb_eth_fix_mac_speed,
64 	.ptp_ref_clk_rate = 200000000,
65 	.tx_clk_rate = 125000000,
66 	.tx_clk_en = true,
67 };
68 
69 static const struct of_device_id intel_eth_plat_match[] = {
70 	{ .compatible = "intel,keembay-dwmac", .data = &kmb_data },
71 	{ }
72 };
73 MODULE_DEVICE_TABLE(of, intel_eth_plat_match);
74 
75 static int intel_eth_plat_probe(struct platform_device *pdev)
76 {
77 	struct plat_stmmacenet_data *plat_dat;
78 	struct stmmac_resources stmmac_res;
79 	const struct of_device_id *match;
80 	struct intel_dwmac *dwmac;
81 	unsigned long rate;
82 	int ret;
83 
84 	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
85 	if (ret)
86 		return ret;
87 
88 	plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
89 	if (IS_ERR(plat_dat)) {
90 		dev_err(&pdev->dev, "dt configuration failed\n");
91 		return PTR_ERR(plat_dat);
92 	}
93 
94 	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
95 	if (!dwmac) {
96 		ret = -ENOMEM;
97 		goto err_remove_config_dt;
98 	}
99 
100 	dwmac->dev = &pdev->dev;
101 	dwmac->tx_clk = NULL;
102 
103 	match = of_match_device(intel_eth_plat_match, &pdev->dev);
104 	if (match && match->data) {
105 		dwmac->data = (const struct intel_dwmac_data *)match->data;
106 
107 		if (dwmac->data->fix_mac_speed)
108 			plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed;
109 
110 		/* Enable TX clock */
111 		if (dwmac->data->tx_clk_en) {
112 			dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
113 			if (IS_ERR(dwmac->tx_clk)) {
114 				ret = PTR_ERR(dwmac->tx_clk);
115 				goto err_remove_config_dt;
116 			}
117 
118 			clk_prepare_enable(dwmac->tx_clk);
119 
120 			/* Check and configure TX clock rate */
121 			rate = clk_get_rate(dwmac->tx_clk);
122 			if (dwmac->data->tx_clk_rate &&
123 			    rate != dwmac->data->tx_clk_rate) {
124 				rate = dwmac->data->tx_clk_rate;
125 				ret = clk_set_rate(dwmac->tx_clk, rate);
126 				if (ret) {
127 					dev_err(&pdev->dev,
128 						"Failed to set tx_clk\n");
129 					goto err_remove_config_dt;
130 				}
131 			}
132 		}
133 
134 		/* Check and configure PTP ref clock rate */
135 		rate = clk_get_rate(plat_dat->clk_ptp_ref);
136 		if (dwmac->data->ptp_ref_clk_rate &&
137 		    rate != dwmac->data->ptp_ref_clk_rate) {
138 			rate = dwmac->data->ptp_ref_clk_rate;
139 			ret = clk_set_rate(plat_dat->clk_ptp_ref, rate);
140 			if (ret) {
141 				dev_err(&pdev->dev,
142 					"Failed to set clk_ptp_ref\n");
143 				goto err_remove_config_dt;
144 			}
145 		}
146 	}
147 
148 	plat_dat->bsp_priv = dwmac;
149 	plat_dat->eee_usecs_rate = plat_dat->clk_ptp_rate;
150 
151 	if (plat_dat->eee_usecs_rate > 0) {
152 		u32 tx_lpi_usec;
153 
154 		tx_lpi_usec = (plat_dat->eee_usecs_rate / 1000000) - 1;
155 		writel(tx_lpi_usec, stmmac_res.addr + GMAC_1US_TIC_COUNTER);
156 	}
157 
158 	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
159 	if (ret) {
160 		clk_disable_unprepare(dwmac->tx_clk);
161 		goto err_remove_config_dt;
162 	}
163 
164 	return 0;
165 
166 err_remove_config_dt:
167 	stmmac_remove_config_dt(pdev, plat_dat);
168 
169 	return ret;
170 }
171 
172 static void intel_eth_plat_remove(struct platform_device *pdev)
173 {
174 	struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
175 
176 	stmmac_pltfr_remove(pdev);
177 	clk_disable_unprepare(dwmac->tx_clk);
178 }
179 
180 static struct platform_driver intel_eth_plat_driver = {
181 	.probe  = intel_eth_plat_probe,
182 	.remove_new = intel_eth_plat_remove,
183 	.driver = {
184 		.name		= "intel-eth-plat",
185 		.pm		= &stmmac_pltfr_pm_ops,
186 		.of_match_table = intel_eth_plat_match,
187 	},
188 };
189 module_platform_driver(intel_eth_plat_driver);
190 
191 MODULE_LICENSE("GPL v2");
192 MODULE_DESCRIPTION("Intel DWMAC platform driver");
193