Commit 4d7c557f authored by Joey Lu's avatar Joey Lu Committed by Jakub Kicinski
Browse files

net: stmmac: dwmac-nuvoton: Add dwmac glue for Nuvoton MA35 family 



Add support for Gigabit Ethernet on Nuvoton MA35 series using dwmac driver.

Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarJoey Lu <a0987203069@gmail.com>
Link: https://patch.msgid.link/20260323101756.81849-4-a0987203069@gmail.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 8454478e

drivers/net/ethernet/stmicro/stmmac/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -132,6 +132,18 @@ config DWMAC_MESON 
	  the stmmac device driver. This driver is used for Meson6,

	  Meson8, Meson8b and GXBB SoCs.



config DWMAC_NUVOTON

	tristate "Nuvoton MA35 dwmac support"

	default ARCH_MA35

	depends on OF && (ARCH_MA35 || COMPILE_TEST)

	select MFD_SYSCON

	help

	  Support for Ethernet controller on Nuvoton MA35 series SoC.



	  This selects the Nuvoton MA35 series SoC glue layer support

	  for the stmmac device driver. The nuvoton-dwmac driver is

	  used for MA35 series SoCs.



config DWMAC_QCOM_ETHQOS

	tristate "Qualcomm ETHQOS support"

	default ARCH_QCOM

drivers/net/ethernet/stmicro/stmmac/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ obj-$(CONFIG_DWMAC_IPQ806X) += dwmac-ipq806x.o 
obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o

obj-$(CONFIG_DWMAC_MEDIATEK)	+= dwmac-mediatek.o

obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o

obj-$(CONFIG_DWMAC_NUVOTON)	+= dwmac-nuvoton.o

obj-$(CONFIG_DWMAC_QCOM_ETHQOS)	+= dwmac-qcom-ethqos.o

obj-$(CONFIG_DWMAC_RENESAS_GBETH) += dwmac-renesas-gbeth.o

obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o

drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c

0 → 100644
+136 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * Nuvoton DWMAC specific glue layer

 *

 * Copyright (C) 2025 Nuvoton Technology Corp.

 *

 * Author: Joey Lu <a0987203069@gmail.com>

 */



#include <linux/mfd/syscon.h>

#include <linux/mod_devicetable.h>

#include <linux/of.h>

#include <linux/of_net.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/stmmac.h>



#include "stmmac_platform.h"



#define NVT_REG_SYS_GMAC0MISCR  0x108

#define NVT_REG_SYS_GMAC1MISCR  0x10C



#define NVT_MISCR_RMII          BIT(0)



/* Two thousand picoseconds are evenly mapped to a 4-bit field,

 * resulting in each step being 2000/15 picoseconds.

 */

#define NVT_PATH_DELAY_STEP     134

#define NVT_TX_DELAY_MASK       GENMASK(19, 16)

#define NVT_RX_DELAY_MASK       GENMASK(23, 20)



struct nvt_priv_data {

	struct device *dev;

	struct regmap *regmap;

	u32 macid;

};



static int nvt_gmac_get_delay(struct device *dev, const char *property)

{

	u32 arg;



	if (of_property_read_u32(dev->of_node, property, &arg))

		return 0;



	if (arg > 2000)

		return -EINVAL;



	if (arg == 2000)

		return 15;



	return arg / NVT_PATH_DELAY_STEP;

}



static int nvt_set_phy_intf_sel(void *bsp_priv, u8 phy_intf_sel)

{

	struct nvt_priv_data *priv = bsp_priv;

	u32 reg, val;

	int ret;



	if (phy_intf_sel == PHY_INTF_SEL_RGMII) {

		ret = nvt_gmac_get_delay(priv->dev, "rx-internal-delay-ps");

		if (ret < 0)

			return ret;

		val = FIELD_PREP(NVT_RX_DELAY_MASK, ret);



		ret = nvt_gmac_get_delay(priv->dev, "tx-internal-delay-ps");

		if (ret < 0)

			return ret;

		val |= FIELD_PREP(NVT_TX_DELAY_MASK, ret);

	} else if (phy_intf_sel == PHY_INTF_SEL_RMII) {

		val = NVT_MISCR_RMII;

	} else {

		return -EINVAL;

	}



	reg = (priv->macid == 0) ? NVT_REG_SYS_GMAC0MISCR : NVT_REG_SYS_GMAC1MISCR;

	regmap_update_bits(priv->regmap, reg,

			   NVT_RX_DELAY_MASK | NVT_TX_DELAY_MASK | NVT_MISCR_RMII, val);



	return 0;

}



static int nvt_gmac_probe(struct platform_device *pdev)

{

	struct plat_stmmacenet_data *plat_dat;

	struct stmmac_resources stmmac_res;

	struct device *dev = &pdev->dev;

	struct nvt_priv_data *priv;

	int ret;



	ret = stmmac_get_platform_resources(pdev, &stmmac_res);

	if (ret)

		return dev_err_probe(dev, ret, "Failed to get platform resources\n");



	plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);

	if (IS_ERR(plat_dat))

		return dev_err_probe(dev, PTR_ERR(plat_dat), "Failed to get platform data\n");



	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);

	if (!priv)

		return dev_err_probe(dev, -ENOMEM, "Failed to allocate private data\n");



	priv->regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node, "nuvoton,sys",

							    1, &priv->macid);

	if (IS_ERR(priv->regmap))

		return dev_err_probe(dev, PTR_ERR(priv->regmap), "Failed to get sys register\n");



	if (priv->macid > 1)

		return dev_err_probe(dev, -EINVAL, "Invalid sys arguments\n");



	plat_dat->bsp_priv = priv;

	plat_dat->set_phy_intf_sel = nvt_set_phy_intf_sel;



	return stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);

}



static const struct of_device_id nvt_dwmac_match[] = {

	{ .compatible = "nuvoton,ma35d1-dwmac"},

	{ }

};

MODULE_DEVICE_TABLE(of, nvt_dwmac_match);



static struct platform_driver nvt_dwmac_driver = {

	.probe  = nvt_gmac_probe,

	.remove = stmmac_pltfr_remove,

	.driver = {

		.name           = "nuvoton-dwmac",

		.pm		= &stmmac_pltfr_pm_ops,

		.of_match_table = nvt_dwmac_match,

	},

};

module_platform_driver(nvt_dwmac_driver);



MODULE_AUTHOR("Joey Lu <a0987203069@gmail.com>");

MODULE_DESCRIPTION("Nuvoton DWMAC specific glue layer");

MODULE_LICENSE("GPL");