dwmac-starfive.c

  1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * StarFive DWMAC platform driver
  4 *
  5 * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
  6 * Copyright (C) 2022 StarFive Technology Co., Ltd.
  7 *
  8 */
  9
 10#include <linux/mod_devicetable.h>
 11#include <linux/platform_device.h>
 12#include <linux/property.h>
 13#include <linux/mfd/syscon.h>
 14#include <linux/regmap.h>
 15
 16#include "stmmac_platform.h"
 17
 18#define STARFIVE_DWMAC_PHY_INFT_FIELD		0x7U
 19
 20#define JH7100_SYSMAIN_REGISTER49_DLYCHAIN	0xc8
 21
 22struct starfive_dwmac_data {
 23	unsigned int gtxclk_dlychain;
 24};
 25
 26struct starfive_dwmac {
 27	struct device *dev;
 28	const struct starfive_dwmac_data *data;
 29};
 30
 31static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat)
 32{
 33	struct starfive_dwmac *dwmac = plat_dat->bsp_priv;
 34	struct regmap *regmap;
 35	unsigned int args[2];
 36	int phy_intf_sel;
 37	int err;
 38
 39	phy_intf_sel = stmmac_get_phy_intf_sel(plat_dat->phy_interface);
 40	if (phy_intf_sel != PHY_INTF_SEL_RGMII &&
 41	    phy_intf_sel != PHY_INTF_SEL_RMII) {
 42		dev_err(dwmac->dev, "unsupported interface %s\n",
 43			phy_modes(plat_dat->phy_interface));
 44		return phy_intf_sel < 0 ? phy_intf_sel : -EINVAL;
 45	}
 46
 47	regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node,
 48						      "starfive,syscon",
 49						      2, args);
 50	if (IS_ERR(regmap))
 51		return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n");
 52
 53	/* args[0]:offset  args[1]: shift */
 54	err = regmap_update_bits(regmap, args[0],
 55				 STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],
 56				 phy_intf_sel << args[1]);
 57	if (err)
 58		return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");
 59
 60	if (dwmac->data) {
 61		err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN,
 62				   dwmac->data->gtxclk_dlychain);
 63		if (err)
 64			return dev_err_probe(dwmac->dev, err,
 65					     "error selecting gtxclk delay chain\n");
 66	}
 67
 68	return 0;
 69}
 70
 71static int starfive_dwmac_probe(struct platform_device *pdev)
 72{
 73	struct plat_stmmacenet_data *plat_dat;
 74	struct stmmac_resources stmmac_res;
 75	struct starfive_dwmac *dwmac;
 76	struct clk *clk_gtx;
 77	int err;
 78
 79	err = stmmac_get_platform_resources(pdev, &stmmac_res);
 80	if (err)
 81		return dev_err_probe(&pdev->dev, err,
 82				     "failed to get resources\n");
 83
 84	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
 85	if (IS_ERR(plat_dat))
 86		return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
 87				     "dt configuration failed\n");
 88
 89	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
 90	if (!dwmac)
 91		return -ENOMEM;
 92
 93	dwmac->data = device_get_match_data(&pdev->dev);
 94
 95	plat_dat->clk_tx_i = devm_clk_get_enabled(&pdev->dev, "tx");
 96	if (IS_ERR(plat_dat->clk_tx_i))
 97		return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat->clk_tx_i),
 98				     "error getting tx clock\n");
 99
100	clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
101	if (IS_ERR(clk_gtx))
102		return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
103				     "error getting gtx clock\n");
104
105	/* Generally, the rgmii_tx clock is provided by the internal clock,
106	 * which needs to match the corresponding clock frequency according
107	 * to different speeds. If the rgmii_tx clock is provided by the
108	 * external rgmii_rxin, there is no need to configure the clock
109	 * internally, because rgmii_rxin will be adaptively adjusted.
110	 */
111	if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
112		plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate;
113
114	dwmac->dev = &pdev->dev;
115	plat_dat->flags |= STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP;
116	plat_dat->bsp_priv = dwmac;
117	plat_dat->dma_cfg->dche = true;
118
119	err = starfive_dwmac_set_mode(plat_dat);
120	if (err)
121		return err;
122
123	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
124}
125
126static const struct starfive_dwmac_data jh7100_data = {
127	.gtxclk_dlychain = 4,
128};
129
130static const struct of_device_id starfive_dwmac_match[] = {
131	{ .compatible = "starfive,jh7100-dwmac", .data = &jh7100_data },
132	{ .compatible = "starfive,jh7110-dwmac" },
133	{ /* sentinel */ }
134};
135MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
136
137static struct platform_driver starfive_dwmac_driver = {
138	.probe  = starfive_dwmac_probe,
139	.remove = stmmac_pltfr_remove,
140	.driver = {
141		.name = "starfive-dwmac",
142		.pm = &stmmac_pltfr_pm_ops,
143		.of_match_table = starfive_dwmac_match,
144	},
145};
146module_platform_driver(starfive_dwmac_driver);
147
148MODULE_LICENSE("GPL");
149MODULE_DESCRIPTION("StarFive DWMAC platform driver");
150MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
151MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");