[PATCH net-next v4 3/3] net: stmmac: Add glue layer for Sophgo SG2044 SoC

Inochi Amaoto
2025-02-09T01:36:57Z

Adds Sophgo dwmac driver support on the Sophgo SG2044 SoC.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
---
drivers/net/ethernet/stmicro/stmmac/Kconfig | 11 ++
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../ethernet/stmicro/stmmac/dwmac-sophgo.c | 105 ++++++++++++++++++
3 files changed, 117 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 4cc85a36a1ab..b6ff51e1ebce 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -181,6 +181,17 @@ config DWMAC_SOCFPGA
for the stmmac device driver. This driver is used for
arria5 and cyclone5 FPGA SoCs.

+config DWMAC_SOPHGO
+ tristate "Sophgo dwmac support"
+ depends on OF && (ARCH_SOPHGO || COMPILE_TEST)
+ default m if ARCH_SOPHGO
+ help
+ Support for ethernet controllers on Sophgo RISC-V SoCs
+
+ This selects the Sophgo SoC specific glue layer support
+ for the stmmac device driver. This driver is used for the
+ ethernet controllers on various Sophgo SoCs.
+
config DWMAC_STARFIVE
tristate "StarFive dwmac support"
depends on OF && (ARCH_STARFIVE || COMPILE_TEST)
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index b26f0e79c2b3..594883fb4164 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -24,6 +24,7 @@ obj-$(CONFIG_DWMAC_ROCKCHIP) += dwmac-rk.o
obj-$(CONFIG_DWMAC_RZN1) += dwmac-rzn1.o
obj-$(CONFIG_DWMAC_S32) += dwmac-s32.o
obj-$(CONFIG_DWMAC_SOCFPGA) += dwmac-altr-socfpga.o
+obj-$(CONFIG_DWMAC_SOPHGO) += dwmac-sophgo.o
obj-$(CONFIG_DWMAC_STARFIVE) += dwmac-starfive.o
obj-$(CONFIG_DWMAC_STI) += dwmac-sti.o
obj-$(CONFIG_DWMAC_STM32) += dwmac-stm32.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
new file mode 100644
index 000000000000..a4997cc0294a
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sophgo.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Sophgo DWMAC platform driver
+ *
+ * Copyright (C) 2024 Inochi Amaoto <inochiama@gmail.com>
+ */
+
+#include <linux/bits.h>
+#include <linux/mod_devicetable.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+
+#include "stmmac_platform.h"
+
+struct sophgo_dwmac {
+ struct device *dev;
+ struct clk *clk_tx;
+};
+
+static void sophgo_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)
+{
+ struct sophgo_dwmac *dwmac = priv;
+ long rate;
+ int ret;
+
+ rate = rgmii_clock(speed);
+ if (rate < 0) {
+ dev_err(dwmac->dev, "invalid speed %u\n", speed);
+ return;
+ }
+
+ ret = clk_set_rate(dwmac->clk_tx, rate);
+ if (ret)
+ dev_err(dwmac->dev, "failed to set tx rate %lu: %pe\n",
+ rate, ERR_PTR(ret));
+}
+
+static int sophgo_sg2044_dwmac_init(struct platform_device *pdev,
+ struct plat_stmmacenet_data *plat_dat,
+ struct stmmac_resources *stmmac_res)
+{
+ struct sophgo_dwmac *dwmac;
+
+ dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);
+ if (!dwmac)
+ return -ENOMEM;
+
+ dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");
+ if (IS_ERR(dwmac->clk_tx))
+ return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),
+ "failed to get tx clock\n");
+
+ dwmac->dev = &pdev->dev;
+ plat_dat->bsp_priv = dwmac;
+ plat_dat->flags |= STMMAC_FLAG_SPH_DISABLE;
+ plat_dat->fix_mac_speed = sophgo_dwmac_fix_mac_speed;
+ plat_dat->multicast_filter_bins = 0;
+ plat_dat->unicast_filter_entries = 1;
+
+ return 0;
+}
+
+static int sophgo_dwmac_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 dev_err_probe(&pdev->dev, ret,
+ "failed to get resources\n");
+
+ plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat_dat))
+ return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),
+ "dt configuration failed\n");
+
+ ret = sophgo_sg2044_dwmac_init(pdev, plat_dat, &stmmac_res);
+ if (ret)
+ return ret;
+
+ return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+}
+
+static const struct of_device_id sophgo_dwmac_match[] = {
+ { .compatible = "sophgo,sg2044-dwmac" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sophgo_dwmac_match);
+
+static struct platform_driver sophgo_dwmac_driver = {
+ .probe = sophgo_dwmac_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "sophgo-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = sophgo_dwmac_match,
+ },
+};
+module_platform_driver(sophgo_dwmac_driver);
+
+MODULE_AUTHOR("Inochi Amaoto <inochiama@gmail.com>");
+MODULE_DESCRIPTION("Sophgo DWMAC platform driver");
+MODULE_LICENSE("GPL");
--
2.48.1