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);
26 unsigned long ptp_ref_clk_rate;
27 unsigned long tx_clk_rate;
28 bool tx_clk_en;
29 };
30
kmb_eth_fix_mac_speed(void * priv,unsigned int speed)31 static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed)
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
intel_eth_plat_probe(struct platform_device * pdev)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
intel_eth_plat_remove(struct platform_device * pdev)172 static int intel_eth_plat_remove(struct platform_device *pdev)
173 {
174 struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
175 int ret;
176
177 ret = stmmac_pltfr_remove(pdev);
178 clk_disable_unprepare(dwmac->tx_clk);
179
180 return ret;
181 }
182
183 static struct platform_driver intel_eth_plat_driver = {
184 .probe = intel_eth_plat_probe,
185 .remove = intel_eth_plat_remove,
186 .driver = {
187 .name = "intel-eth-plat",
188 .pm = &stmmac_pltfr_pm_ops,
189 .of_match_table = intel_eth_plat_match,
190 },
191 };
192 module_platform_driver(intel_eth_plat_driver);
193
194 MODULE_LICENSE("GPL v2");
195 MODULE_DESCRIPTION("Intel DWMAC platform driver");
196
