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// SPDX-License-Identifier: GPL-2.0+
/*
* StarFive DWMAC platform driver
*
* Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
* Copyright (C) 2022 StarFive Technology Co., Ltd.
*
*/
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include "stmmac_platform.h"
#define STARFIVE_DWMAC_PHY_INFT_RGMII 0x1
#define STARFIVE_DWMAC_PHY_INFT_RMII 0x4
#define STARFIVE_DWMAC_PHY_INFT_FIELD 0x7U
#define JH7100_SYSMAIN_REGISTER49_DLYCHAIN 0xc8
struct starfive_dwmac_data {
unsigned int gtxclk_dlychain;
};
struct starfive_dwmac {
struct device *dev;
struct clk *clk_tx;
const struct starfive_dwmac_data *data;
};
static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
{
struct starfive_dwmac *dwmac = priv;
unsigned long rate;
int err;
rate = clk_get_rate(dwmac->clk_tx);
switch (speed) {
case SPEED_1000:
rate = 125000000;
break;
case SPEED_100:
rate = 25000000;
break;
case SPEED_10:
rate = 2500000;
break;
default:
dev_err(dwmac->dev, "invalid speed %u\n", speed);
break;
}
err = clk_set_rate(dwmac->clk_tx, rate);
if (err)
dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
}
static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat)
{
struct starfive_dwmac *dwmac = plat_dat->bsp_priv;
struct regmap *regmap;
unsigned int args[2];
unsigned int mode;
int err;
switch (plat_dat->mac_interface) {
case PHY_INTERFACE_MODE_RMII:
mode = STARFIVE_DWMAC_PHY_INFT_RMII;
break;
case PHY_INTERFACE_MODE_RGMII:
case PHY_INTERFACE_MODE_RGMII_ID:
case PHY_INTERFACE_MODE_RGMII_RXID:
case PHY_INTERFACE_MODE_RGMII_TXID:
mode = STARFIVE_DWMAC_PHY_INFT_RGMII;
break;
default:
dev_err(dwmac->dev, "unsupported interface %d\n",
plat_dat->mac_interface);
return -EINVAL;
}
regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node,
"starfive,syscon",
2, args);
if (IS_ERR(regmap))
return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n");
/* args[0]:offset args[1]: shift */
err = regmap_update_bits(regmap, args[0],
STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],
mode << args[1]);
if (err)
return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");
if (dwmac->data) {
err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN,
dwmac->data->gtxclk_dlychain);
if (err)
return dev_err_probe(dwmac->dev, err,
"error selecting gtxclk delay chain\n");
}
return 0;
}
static int starfive_dwmac_probe(struct platform_device *pdev)
{
struct plat_stmmacenet_data *plat_dat;
struct stmmac_resources stmmac_res;
struct starfive_dwmac *dwmac;
struct clk *clk_gtx;
int err;
err = stmmac_get_platform_resources(pdev, &stmmac_res);
if (err)
return dev_err_probe(&pdev->dev, err,
"failed to get resources\n");
plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
if (IS_ERR(plat_dat))
return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
"dt configuration failed\n");
dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
if (!dwmac)
return -ENOMEM;
dwmac->data = device_get_match_data(&pdev->dev);
dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
if (IS_ERR(dwmac->clk_tx))
return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
"error getting tx clock\n");
clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
if (IS_ERR(clk_gtx))
return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
"error getting gtx clock\n");
/* Generally, the rgmii_tx clock is provided by the internal clock,
* which needs to match the corresponding clock frequency according
* to different speeds. If the rgmii_tx clock is provided by the
* external rgmii_rxin, there is no need to configure the clock
* internally, because rgmii_rxin will be adaptively adjusted.
*/
if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed;
dwmac->dev = &pdev->dev;
plat_dat->bsp_priv = dwmac;
plat_dat->dma_cfg->dche = true;
err = starfive_dwmac_set_mode(plat_dat);
if (err)
return err;
return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
}
static const struct starfive_dwmac_data jh7100_data = {
.gtxclk_dlychain = 4,
};
static const struct of_device_id starfive_dwmac_match[] = {
{ .compatible = "starfive,jh7100-dwmac", .data = &jh7100_data },
{ .compatible = "starfive,jh7110-dwmac" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
static struct platform_driver starfive_dwmac_driver = {
.probe = starfive_dwmac_probe,
.remove = stmmac_pltfr_remove,
.driver = {
.name = "starfive-dwmac",
.pm = &stmmac_pltfr_pm_ops,
.of_match_table = starfive_dwmac_match,
},
};
module_platform_driver(starfive_dwmac_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("StarFive DWMAC platform driver");
MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");
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