152 lines
3.6 KiB
C
152 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Intel DWMAC platform driver
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*
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* Copyright(C) 2020 Intel Corporation
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*/
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#include <linux/ethtool.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/property.h>
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#include <linux/stmmac.h>
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#include "dwmac4.h"
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#include "stmmac.h"
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#include "stmmac_platform.h"
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struct intel_dwmac {
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struct device *dev;
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struct clk *tx_clk;
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const struct intel_dwmac_data *data;
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};
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struct intel_dwmac_data {
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unsigned long ptp_ref_clk_rate;
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unsigned long tx_clk_rate;
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bool tx_clk_en;
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};
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static const struct intel_dwmac_data kmb_data = {
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.ptp_ref_clk_rate = 200000000,
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.tx_clk_rate = 125000000,
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.tx_clk_en = true,
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};
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static const struct of_device_id intel_eth_plat_match[] = {
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{ .compatible = "intel,keembay-dwmac", .data = &kmb_data },
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{ }
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};
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MODULE_DEVICE_TABLE(of, intel_eth_plat_match);
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static int intel_eth_plat_probe(struct platform_device *pdev)
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{
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struct plat_stmmacenet_data *plat_dat;
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struct stmmac_resources stmmac_res;
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struct intel_dwmac *dwmac;
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unsigned long rate;
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int ret;
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ret = stmmac_get_platform_resources(pdev, &stmmac_res);
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if (ret)
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return ret;
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plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
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if (IS_ERR(plat_dat)) {
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dev_err(&pdev->dev, "dt configuration failed\n");
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return PTR_ERR(plat_dat);
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}
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dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
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if (!dwmac)
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return -ENOMEM;
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dwmac->dev = &pdev->dev;
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dwmac->tx_clk = NULL;
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/*
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* This cannot return NULL at this point because the driver’s
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* compatibility with the device has already been validated in
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* platform_match().
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*/
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dwmac->data = device_get_match_data(&pdev->dev);
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/* Enable TX clock */
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if (dwmac->data->tx_clk_en) {
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dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");
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if (IS_ERR(dwmac->tx_clk))
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return PTR_ERR(dwmac->tx_clk);
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ret = clk_prepare_enable(dwmac->tx_clk);
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if (ret) {
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dev_err(&pdev->dev,
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"Failed to enable tx_clk\n");
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return ret;
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}
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/* Check and configure TX clock rate */
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rate = clk_get_rate(dwmac->tx_clk);
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if (dwmac->data->tx_clk_rate &&
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rate != dwmac->data->tx_clk_rate) {
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rate = dwmac->data->tx_clk_rate;
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ret = clk_set_rate(dwmac->tx_clk, rate);
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if (ret) {
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dev_err(&pdev->dev,
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"Failed to set tx_clk\n");
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goto err_tx_clk_disable;
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}
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}
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/* Check and configure PTP ref clock rate */
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rate = clk_get_rate(plat_dat->clk_ptp_ref);
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if (dwmac->data->ptp_ref_clk_rate &&
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rate != dwmac->data->ptp_ref_clk_rate) {
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rate = dwmac->data->ptp_ref_clk_rate;
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ret = clk_set_rate(plat_dat->clk_ptp_ref, rate);
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if (ret) {
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dev_err(&pdev->dev,
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"Failed to set clk_ptp_ref\n");
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goto err_tx_clk_disable;
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}
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}
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}
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plat_dat->clk_tx_i = dwmac->tx_clk;
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plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
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plat_dat->bsp_priv = dwmac;
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ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
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if (ret)
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goto err_tx_clk_disable;
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return 0;
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err_tx_clk_disable:
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if (dwmac->data->tx_clk_en)
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clk_disable_unprepare(dwmac->tx_clk);
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return ret;
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}
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static void intel_eth_plat_remove(struct platform_device *pdev)
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{
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struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);
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stmmac_pltfr_remove(pdev);
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if (dwmac->data->tx_clk_en)
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clk_disable_unprepare(dwmac->tx_clk);
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}
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static struct platform_driver intel_eth_plat_driver = {
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.probe = intel_eth_plat_probe,
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.remove = intel_eth_plat_remove,
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.driver = {
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.name = "intel-eth-plat",
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.pm = &stmmac_pltfr_pm_ops,
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.of_match_table = intel_eth_plat_match,
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},
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};
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module_platform_driver(intel_eth_plat_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Intel DWMAC platform driver");
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