[PATCH v1 2/2] net: stmmac: Add NPCM support

[Tomer Maimon <tmaimon77@gmail.com>]

Add Nuvoton NPCM BMC SoCs support to STMMAC dwmac driver.

And modify MAINTAINERS to add a new F: entry for this driver.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 MAINTAINERS                                   |   1 +
 drivers/net/ethernet/stmicro/stmmac/Kconfig   |   9 ++
 drivers/net/ethernet/stmicro/stmmac/Makefile  |   1 +
 .../net/ethernet/stmicro/stmmac/dwmac-npcm.c  | 121 ++++++++++++++++++
 4 files changed, 132 insertions(+)
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-npcm.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 5c9f868e13b6..43059c7d00c7 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2507,6 +2507,7 @@ F:	arch/arm64/boot/dts/nuvoton/
 F:	drivers/*/*/*npcm*
 F:	drivers/*/*npcm*
 F:	drivers/rtc/rtc-nct3018y.c
+F:	drivers/net/ethernet/stmicro/stmmac/dwmac-npcm.c
 F:	include/dt-bindings/clock/nuvoton,npcm7xx-clock.h
 F:	include/dt-bindings/clock/nuvoton,npcm845-clk.h
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index a2b9e289aa36..2487a674d0d3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -121,6 +121,15 @@ config DWMAC_MESON
 	  the stmmac device driver. This driver is used for Meson6,
 	  Meson8, Meson8b and GXBB SoCs.
 
+config DWMAC_NPCM
+	tristate "Nuvoton NPCM dwmac support"
+	depends on OF && (ARCH_NPCM || COMPILE_TEST)
+	help
+	  Support for Ethernet controller on Nuvoton NPCM BMC SoCs.
+
+	  This selects the Nuvoton NPCM BMC SoC glue layer support for
+	  the stmmac device driver. This driver is used for NPCM8xx SoCs.
+
 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 80e598bd4255..1c86c8ca39f0 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-$(CONFIG_DWMAC_NPCM)	+= dwmac-npcm.o
 obj-$(CONFIG_DWMAC_QCOM_ETHQOS)	+= dwmac-qcom-ethqos.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-npcm.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-npcm.c
new file mode 100644
index 000000000000..dbb857661142
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-npcm.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2023 Nuvoton Technology corporation.
+
+#include <linux/device.h>
+#include <linux/ethtool.h>
+#include <linux/io.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/stmmac.h>
+
+#include "stmmac_platform.h"
+
+#define IND_AC_BA_REG		0x1FE
+#define SR_MII_CTRL		0x3E0000
+
+#define PCS_SR_MII_CTRL_REG	0x0
+#define PCS_SPEED_SELECT6	BIT(6)
+#define PCS_AN_ENABLE		BIT(12)
+#define PCS_SPEED_SELECT13	BIT(13)
+#define PCS_RST			BIT(15)
+
+#define PCS_MASK_SPEED		0xDFBF
+
+struct npcm_dwmac {
+	void __iomem	*reg;
+};
+
+static void npcm_dwmac_fix_mac_speed(void *priv, unsigned int speed,
+				     unsigned int mode)
+{
+	struct npcm_dwmac *dwmac = priv;
+	u16 val;
+
+	iowrite16((u16)(SR_MII_CTRL >> 9), dwmac->reg + IND_AC_BA_REG);
+	val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG);
+	val &= PCS_MASK_SPEED;
+
+	switch (speed) {
+	case SPEED_1000:
+		val |= PCS_SPEED_SELECT6;
+		break;
+	case SPEED_100:
+		val |= PCS_SPEED_SELECT13;
+		break;
+	case SPEED_10:
+		break;
+	}
+
+	iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG);
+}
+
+void npcm_dwmac_pcs_init(struct npcm_dwmac *dwmac, struct device *dev,
+			 struct plat_stmmacenet_data *plat_dat)
+{
+	u16 val;
+
+	iowrite16((u16)(SR_MII_CTRL >> 9), dwmac->reg + IND_AC_BA_REG);
+	val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG);
+	val |= PCS_RST;
+	iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG);
+
+	while (val & PCS_RST)
+		val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG);
+
+	val &= ~(PCS_AN_ENABLE);
+	iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG);
+}
+
+static int npcm_dwmac_probe(struct platform_device *pdev)
+{
+	struct plat_stmmacenet_data *plat_dat;
+	struct stmmac_resources stmmac_res;
+	struct npcm_dwmac *dwmac;
+	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);
+
+	dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+	if (!dwmac)
+		ret = -ENOMEM;
+
+	dwmac->reg = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(dwmac->reg))
+		ret = PTR_ERR(dwmac->reg);
+
+	npcm_dwmac_pcs_init(dwmac, &pdev->dev, plat_dat);
+
+	plat_dat->has_gmac = true;
+	plat_dat->bsp_priv = dwmac;
+	plat_dat->fix_mac_speed = npcm_dwmac_fix_mac_speed;
+
+	return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static const struct of_device_id npcm_dwmac_match[] = {
+	{ .compatible = "nuvoton,npcm8xx-sgmii" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, npcm_dwmac_match);
+
+static struct platform_driver npcm_dwmac_driver = {
+	.probe  = npcm_dwmac_probe,
+	.remove_new = stmmac_pltfr_remove,
+	.driver = {
+		.name           = "npcm-dwmac",
+		.pm		= &stmmac_pltfr_pm_ops,
+		.of_match_table = npcm_dwmac_match,
+	},
+};
+module_platform_driver(npcm_dwmac_driver);
+
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
+MODULE_DESCRIPTION("Nuvoton NPCM DWMAC glue layer");
+MODULE_LICENSE("GPL v2");
-- 
2.33.0


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