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
18struct intel_dwmac {
19	struct device *dev;
20	struct clk *tx_clk;
21	const struct intel_dwmac_data *data;
22};
23
24struct 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
31static 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
62static 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
69static const struct of_device_id intel_eth_plat_match[] = {
70	{ .compatible = "intel,keembay-dwmac", .data = &kmb_data },
71	{ }
72};
73MODULE_DEVICE_TABLE(of, intel_eth_plat_match);
74
75static 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
166err_remove_config_dt:
167	stmmac_remove_config_dt(pdev, plat_dat);
168
169	return ret;
170}
171
172static 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
180static 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};
189module_platform_driver(intel_eth_plat_driver);
190
191MODULE_LICENSE("GPL v2");
192MODULE_DESCRIPTION("Intel DWMAC platform driver");
193