[PATCH v5 3/3] net: stmmac: dwmac-nuvoton: Add dwmac glue for Nuvoton MA35 family

From: Joey Lu
Date: Wed Dec 18 2024 - 06:46:40 EST

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

Signed-off-by: Joey Lu <a0987203069@xxxxxxxxx>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 ++
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../ethernet/stmicro/stmmac/dwmac-nuvoton.c | 182 ++++++++++++++++++
3 files changed, 194 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 6658536a4e17..c8cbc0ec1311 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -121,6 +121,17 @@ 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.
+
config DWMAC_QCOM_ETHQOS
tristate "Qualcomm ETHQOS support"
default ARCH_QCOM
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 2389fd261344..9812b824459f 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -19,6 +19,7 @@ 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-$(CONFIG_DWMAC_ROCKCHIP) += dwmac-rk.o
obj-$(CONFIG_DWMAC_RZN1) += dwmac-rzn1.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c
new file mode 100644
index 000000000000..c5b8933c1f44
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-nuvoton.c
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Nuvoton DWMAC specific glue layer
+ *
+ * Copyright (C) 2024 Nuvoton Technology Corp.
+ *
+ * Author: Joey Lu <yclu4@xxxxxxxxxxx>
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include <linux/of_net.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/stmmac.h>
+
+#include "stmmac.h"
+#include "stmmac_platform.h"
+
+#define REG_SYS_GMAC0MISCR 0x108
+#define REG_SYS_GMAC1MISCR 0x10C
+
+#define MISCR_RMII BIT(0)
+
+/* 2000ps is mapped to 0 ~ 0xF */
+#define PATH_DELAY_DEC 134
+#define TX_DELAY_OFFSET 16
+#define TX_DELAY_MASK GENMASK(19, 16)
+#define RX_DELAY_OFFSET 20
+#define RX_DELAY_MASK GENMASK(23, 20)
+
+struct nvt_priv_data {
+ struct platform_device *pdev;
+ struct regmap *regmap;
+};
+
+static struct nvt_priv_data *
+nuvoton_gmac_setup(struct platform_device *pdev, struct plat_stmmacenet_data *plat)
+{
+ struct device *dev = &pdev->dev;
+ struct nvt_priv_data *bsp_priv;
+ phy_interface_t phy_mode;
+ u32 tx_delay, rx_delay;
+ u32 macid, arg, reg;
+
+ bsp_priv = devm_kzalloc(dev, sizeof(*bsp_priv), GFP_KERNEL);
+ if (!bsp_priv)
+ return ERR_PTR(-ENOMEM);
+
+ bsp_priv->regmap =
+ syscon_regmap_lookup_by_phandle_args(dev->of_node, "nuvoton,sys", 1, &macid);
+ if (IS_ERR(bsp_priv->regmap)) {
+ dev_err_probe(dev, PTR_ERR(bsp_priv->regmap), "Failed to get sys register\n");
+ return ERR_PTR(-ENODEV);
+ }
+ if (macid > 1) {
+ dev_err_probe(dev, -EINVAL, "Invalid sys arguments\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (of_property_read_u32(dev->of_node, "tx-internal-delay-ps", &arg)) {
+ tx_delay = 0; /* Default value is 0 */
+ } else {
+ if (arg <= 2000) {
+ tx_delay = (arg == 2000) ? 0xF : (arg / PATH_DELAY_DEC);
+ dev_dbg(dev, "Set Tx path delay to 0x%x\n", tx_delay);
+ } else {
+ dev_err(dev, "Invalid Tx path delay argument.\n");
+ return ERR_PTR(-EINVAL);
+ }
+ }
+ if (of_property_read_u32(dev->of_node, "rx-internal-delay-ps", &arg)) {
+ rx_delay = 0; /* Default value is 0 */
+ } else {
+ if (arg <= 2000) {
+ rx_delay = (arg == 2000) ? 0xF : (arg / PATH_DELAY_DEC);
+ dev_dbg(dev, "Set Rx path delay to 0x%x\n", rx_delay);
+ } else {
+ dev_err(dev, "Invalid Rx path delay argument.\n");
+ return ERR_PTR(-EINVAL);
+ }
+ }
+
+ regmap_read(bsp_priv->regmap,
+ macid == 0 ? REG_SYS_GMAC0MISCR : REG_SYS_GMAC1MISCR, &reg);
+ reg &= ~(TX_DELAY_MASK | RX_DELAY_MASK);
+
+ if (of_get_phy_mode(pdev->dev.of_node, &phy_mode)) {
+ dev_err(dev, "missing phy mode property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ switch (phy_mode) {
+ case PHY_INTERFACE_MODE_RGMII:
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ reg &= ~MISCR_RMII;
+ break;
+ case PHY_INTERFACE_MODE_RMII:
+ reg |= MISCR_RMII;
+ break;
+ default:
+ dev_err(dev, "Unsupported phy-mode (%d)\n", phy_mode);
+ return ERR_PTR(-EINVAL);
+ }
+
+ if (!(reg & MISCR_RMII)) {
+ reg |= tx_delay << TX_DELAY_OFFSET;
+ reg |= rx_delay << RX_DELAY_OFFSET;
+ }
+
+ regmap_write(bsp_priv->regmap,
+ macid == 0 ? REG_SYS_GMAC0MISCR : REG_SYS_GMAC1MISCR, reg);
+
+ bsp_priv->pdev = pdev;
+
+ return bsp_priv;
+}
+
+static int nuvoton_gmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ int ret;
+
+ ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (ret)
+ return ret;
+
+ plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat_dat))
+ return PTR_ERR(plat_dat);
+
+ /* Nuvoton DWMAC configs */
+ plat_dat->has_gmac = 1;
+ plat_dat->tx_fifo_size = 2048;
+ plat_dat->rx_fifo_size = 4096;
+ plat_dat->multicast_filter_bins = 0;
+ plat_dat->unicast_filter_entries = 8;
+ plat_dat->flags &= ~STMMAC_FLAG_USE_PHY_WOL;
+
+ plat_dat->bsp_priv = nuvoton_gmac_setup(pdev, plat_dat);
+ if (IS_ERR(plat_dat->bsp_priv)) {
+ ret = PTR_ERR(plat_dat->bsp_priv);
+ return ret;
+ }
+
+ ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+ if (ret)
+ return ret;
+
+ /* The PMT flag is determined by the RWK property.
+ * However, our hardware is configured to support only MGK.
+ * This is an override on PMT to enable WoL capability.
+ */
+ plat_dat->pmt = 1;
+ device_set_wakeup_capable(&pdev->dev, 1);
+
+ return 0;
+}
+
+static const struct of_device_id nuvoton_dwmac_match[] = {
+ { .compatible = "nuvoton,ma35d1-dwmac"},
+ { }
+};
+MODULE_DEVICE_TABLE(of, nuvoton_dwmac_match);
+
+static struct platform_driver nuvoton_dwmac_driver = {
+ .probe = nuvoton_gmac_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "nuvoton-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = nuvoton_dwmac_match,
+ },
+};
+module_platform_driver(nuvoton_dwmac_driver);
+
+MODULE_AUTHOR("Joey Lu <yclu4@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Nuvoton DWMAC specific glue layer");
+MODULE_LICENSE("GPL v2");
--
2.34.1