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
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@@ -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
+1 −0
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@@ -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
+136 −0
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// 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");