dwmac-intel-plat.c

  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/platform_device.h>
 11#include <linux/property.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	unsigned long ptp_ref_clk_rate;
 26	unsigned long tx_clk_rate;
 27	bool tx_clk_en;
 28};
 29
 30static const struct intel_dwmac_data kmb_data = {
 31	.ptp_ref_clk_rate = 200000000,
 32	.tx_clk_rate = 125000000,
 33	.tx_clk_en = true,
 34};
 35
 36static const struct of_device_id intel_eth_plat_match[] = {
 37	{ .compatible = "intel,keembay-dwmac", .data = &kmb_data },
 38	{ }
 39};
 40MODULE_DEVICE_TABLE(of, intel_eth_plat_match);
 41
 42static int intel_eth_plat_probe(struct platform_device *pdev)
 43{
 44	struct plat_stmmacenet_data *plat_dat;
 45	struct stmmac_resources stmmac_res;
 46	struct intel_dwmac *dwmac;
 47	unsigned long rate;
 48	int ret;
 49
 50	ret = stmmac_get_platform_resources(pdev, &stmmac_res);
 51	if (ret)
 52		return ret;
 53
 54	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
 55	if (IS_ERR(plat_dat)) {
 56		dev_err(&pdev->dev, "dt configuration failed\n");
 57		return PTR_ERR(plat_dat);
 58	}
 59
 60	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
 61	if (!dwmac)
 62		return -ENOMEM;
 63
 64	dwmac->dev = &pdev->dev;
 65	dwmac->tx_clk = NULL;
 66
 67	/*
 68	 * This cannot return NULL at this point because the driver’s
 69	 * compatibility with the device has already been validated in
 70	 * platform_match().
 71	 */
 72	dwmac->data = device_get_match_data(&pdev->dev);
 73
 74	/* Enable TX clock */
 75	if (dwmac->data->tx_clk_en) {
 76		dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
 77		if (IS_ERR(dwmac->tx_clk))
 78			return PTR_ERR(dwmac->tx_clk);
 79
 80		ret = clk_prepare_enable(dwmac->tx_clk);
 81		if (ret) {
 82			dev_err(&pdev->dev,
 83				"Failed to enable tx_clk\n");
 84			return ret;
 85		}
 86
 87		/* Check and configure TX clock rate */
 88		rate = clk_get_rate(dwmac->tx_clk);
 89		if (dwmac->data->tx_clk_rate &&
 90		    rate != dwmac->data->tx_clk_rate) {
 91			rate = dwmac->data->tx_clk_rate;
 92			ret = clk_set_rate(dwmac->tx_clk, rate);
 93			if (ret) {
 94				dev_err(&pdev->dev,
 95					"Failed to set tx_clk\n");
 96				goto err_tx_clk_disable;
 97			}
 98		}
 99
100		/* Check and configure PTP ref clock rate */
101		rate = clk_get_rate(plat_dat->clk_ptp_ref);
102		if (dwmac->data->ptp_ref_clk_rate &&
103		    rate != dwmac->data->ptp_ref_clk_rate) {
104			rate = dwmac->data->ptp_ref_clk_rate;
105			ret = clk_set_rate(plat_dat->clk_ptp_ref, rate);
106			if (ret) {
107				dev_err(&pdev->dev,
108					"Failed to set clk_ptp_ref\n");
109				goto err_tx_clk_disable;
110			}
111		}
112	}
113
114	plat_dat->clk_tx_i = dwmac->tx_clk;
115	plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
116	plat_dat->bsp_priv = dwmac;
117
118	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
119	if (ret)
120		goto err_tx_clk_disable;
121
122	return 0;
123
124err_tx_clk_disable:
125	if (dwmac->data->tx_clk_en)
126		clk_disable_unprepare(dwmac->tx_clk);
127	return ret;
128}
129
130static void intel_eth_plat_remove(struct platform_device *pdev)
131{
132	struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
133
134	stmmac_pltfr_remove(pdev);
135	if (dwmac->data->tx_clk_en)
136		clk_disable_unprepare(dwmac->tx_clk);
137}
138
139static struct platform_driver intel_eth_plat_driver = {
140	.probe  = intel_eth_plat_probe,
141	.remove = intel_eth_plat_remove,
142	.driver = {
143		.name		= "intel-eth-plat",
144		.pm		= &stmmac_pltfr_pm_ops,
145		.of_match_table = intel_eth_plat_match,
146	},
147};
148module_platform_driver(intel_eth_plat_driver);
149
150MODULE_LICENSE("GPL v2");
151MODULE_DESCRIPTION("Intel DWMAC platform driver");