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Message-ID: <20250611080228.1166090-3-inochiama@gmail.com>
Date: Wed, 11 Jun 2025 16:02:00 +0800
From: Inochi Amaoto <inochiama@...il.com>
To: Andrew Lunn <andrew+netdev@...n.ch>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Chen Wang <unicorn_wang@...look.com>,
Inochi Amaoto <inochiama@...il.com>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>,
Alexandre Ghiti <alex@...ti.fr>
Cc: netdev@...r.kernel.org,
devicetree@...r.kernel.org,
sophgo@...ts.linux.dev,
linux-kernel@...r.kernel.org,
linux-riscv@...ts.infradead.org,
Yixun Lan <dlan@...too.org>,
Longbin Li <looong.bin@...il.com>
Subject: [PATCH net-next 2/2] net: mdio-mux: Add MDIO mux driver for Sophgo CV1800 SoCs
Add device driver for the mux driver for Sophgo CV18XX/SG200X
series SoCs.
Signed-off-by: Inochi Amaoto <inochiama@...il.com>
---
drivers/net/mdio/Kconfig | 10 +++
drivers/net/mdio/Makefile | 1 +
drivers/net/mdio/mdio-mux-cv1800b.c | 119 ++++++++++++++++++++++++++++
3 files changed, 130 insertions(+)
create mode 100644 drivers/net/mdio/mdio-mux-cv1800b.c
diff --git a/drivers/net/mdio/Kconfig b/drivers/net/mdio/Kconfig
index 7db40aaa079d..fe553016b77d 100644
--- a/drivers/net/mdio/Kconfig
+++ b/drivers/net/mdio/Kconfig
@@ -278,5 +278,15 @@ config MDIO_BUS_MUX_MMIOREG
Currently, only 8/16/32 bits registers are supported.
+config MDIO_BUS_MUX_SOPHGO_CV1800B
+ tristate "Sophgo CV1800 MDIO multiplexer driver"
+ depends on ARCH_SOPHGO || COMPILE_TEST
+ depends on OF_MDIO && HAS_IOMEM
+ select MDIO_BUS_MUX
+ default m if ARCH_SOPHGO
+ help
+ This module provides a driver for the MDIO multiplexer/glue of
+ the Sophgo CV1800 series SoC. The multiplexer connects either
+ the external or the internal MDIO bus to the parent bus.
endif
diff --git a/drivers/net/mdio/Makefile b/drivers/net/mdio/Makefile
index c23778e73890..a67be2abc343 100644
--- a/drivers/net/mdio/Makefile
+++ b/drivers/net/mdio/Makefile
@@ -33,3 +33,4 @@ obj-$(CONFIG_MDIO_BUS_MUX_MESON_G12A) += mdio-mux-meson-g12a.o
obj-$(CONFIG_MDIO_BUS_MUX_MESON_GXL) += mdio-mux-meson-gxl.o
obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o
obj-$(CONFIG_MDIO_BUS_MUX_MULTIPLEXER) += mdio-mux-multiplexer.o
+obj-$(CONFIG_MDIO_BUS_MUX_SOPHGO_CV1800B) += mdio-mux-cv1800b.o
diff --git a/drivers/net/mdio/mdio-mux-cv1800b.c b/drivers/net/mdio/mdio-mux-cv1800b.c
new file mode 100644
index 000000000000..6c69e83c3dcd
--- /dev/null
+++ b/drivers/net/mdio/mdio-mux-cv1800b.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sophgo CV1800 MDIO multiplexer driver
+ *
+ * Copyright (C) 2025 Inochi Amaoto <inochiama@...il.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/mdio-mux.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#define EPHY_PAGE_SELECT 0x07c
+#define EPHY_CTRL 0x800
+#define EPHY_REG_SELECT 0x804
+
+#define EPHY_PAGE_SELECT_SRC GENMASK(12, 8)
+
+#define EPHY_CTRL_ANALOG_SHUTDOWN BIT(0)
+#define EPHY_CTRL_USE_EXTPHY BIT(7)
+#define EPHY_CTRL_PHYMODE BIT(8)
+#define EPHY_CTRL_PHYMODE_SMI_RMII 1
+#define EPHY_CTRL_EXTPHY_ID GENMASK(15, 11)
+
+#define EPHY_REG_SELECT_MDIO 0
+#define EPHY_REG_SELECT_APB 1
+
+#define CV1800B_MDIO_INTERNAL_ID 1
+#define CV1800B_MDIO_EXTERNAL_ID 0
+
+struct cv1800b_mdio_mux {
+ void __iomem *regs;
+ void *mux_handle;
+};
+
+static int cv1800b_enable_mdio(struct cv1800b_mdio_mux *mdmux, bool internal_phy)
+{
+ u32 val;
+
+ val = readl(mdmux->regs + EPHY_CTRL);
+
+ if (internal_phy)
+ val &= ~EPHY_CTRL_USE_EXTPHY;
+ else
+ val |= EPHY_CTRL_USE_EXTPHY;
+
+ writel(val, mdmux->regs + EPHY_CTRL);
+
+ writel(EPHY_REG_SELECT_MDIO, mdmux->regs + EPHY_REG_SELECT);
+
+ return 0;
+}
+
+static int cv1800b_mdio_switch_fn(int current_child, int desired_child,
+ void *data)
+{
+ struct cv1800b_mdio_mux *mdmux = dev_get_drvdata(data);
+
+ if (current_child == desired_child)
+ return 0;
+
+ switch (desired_child) {
+ case CV1800B_MDIO_EXTERNAL_ID:
+ return cv1800b_enable_mdio(mdmux, false);
+ case CV1800B_MDIO_INTERNAL_ID:
+ return cv1800b_enable_mdio(mdmux, true);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int cv1800b_mdio_mux_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cv1800b_mdio_mux *mdmux;
+
+ mdmux = devm_kzalloc(dev, sizeof(*mdmux), GFP_KERNEL);
+ if (!mdmux)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, mdmux);
+
+ mdmux->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(mdmux->regs))
+ return PTR_ERR(mdmux->regs);
+
+ return mdio_mux_init(dev, dev->of_node, cv1800b_mdio_switch_fn,
+ &mdmux->mux_handle, dev, NULL);
+}
+
+static void cv1800b_mdio_mux_remove(struct platform_device *pdev)
+{
+ struct cv1800b_mdio_mux *mdmux = platform_get_drvdata(pdev);
+
+ mdio_mux_uninit(mdmux->mux_handle);
+}
+
+static const struct of_device_id cv1800b_mdio_mux_match[] = {
+ { .compatible = "sophgo,cv1800b-mdio-mux", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cv1800b_mdio_mux_match);
+
+static struct platform_driver cv1800b_mdio_mux_driver = {
+ .probe = cv1800b_mdio_mux_probe,
+ .remove = cv1800b_mdio_mux_remove,
+ .driver = {
+ .name = "cv1800b-mdio-mux",
+ .of_match_table = cv1800b_mdio_mux_match,
+ },
+};
+module_platform_driver(cv1800b_mdio_mux_driver);
+
+MODULE_DESCRIPTION("Sophgo CV1800 MDIO multiplexer driver");
+MODULE_AUTHOR("Inochi Amaoto <inochiama@...il.com>");
+MODULE_LICENSE("GPL");
--
2.49.0
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