[PATCH v8 5/6] net: stmmac: Add glue layer for StarFive JH7110 SoC

Samin Guo
2023-03-24T02:29:23Z

This adds StarFive dwmac driver support on the StarFive JH7110 SoC.

Tested-by: Tommaso Merciai <tomm.merciai@gmail.com>
Co-developed-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
---
MAINTAINERS | 1 +
drivers/net/ethernet/stmicro/stmmac/Kconfig | 12 ++
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../ethernet/stmicro/stmmac/dwmac-starfive.c | 121 ++++++++++++++++++
4 files changed, 135 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 5c6d53a9f62a..c27182492a6c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19909,6 +19909,7 @@ STARFIVE DWMAC GLUE LAYER
M: Emil Renner Berthing <kernel@esmil.dk>
M: Samin Guo <samin.guo@starfivetech.com>
S: Maintained
+F: Documentation/devicetree/bindings/net/dwmac-starfive.c
F: Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml

STARFIVE JH7110 MMC/SD/SDIO DRIVER
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index f77511fe4e87..5f5a997f21f3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -165,6 +165,18 @@ config DWMAC_SOCFPGA
for the stmmac device driver. This driver is used for
arria5 and cyclone5 FPGA SoCs.

+config DWMAC_STARFIVE
+ tristate "StarFive dwmac support"
+ depends on OF && (ARCH_STARFIVE || COMPILE_TEST)
+ select MFD_SYSCON
+ default m if ARCH_STARFIVE
+ help
+ Support for ethernet controllers on StarFive RISC-V SoCs
+
+ This selects the StarFive platform specific glue layer support for
+ the stmmac device driver. This driver is used for StarFive JH7110
+ ethernet controller.
+
config DWMAC_STI
tristate "STi GMAC support"
default ARCH_STI
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 057e4bab5c08..8738fdbb4b2d 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -23,6 +23,7 @@ obj-$(CONFIG_DWMAC_OXNAS) += dwmac-oxnas.o
obj-$(CONFIG_DWMAC_QCOM_ETHQOS) += dwmac-qcom-ethqos.o
obj-$(CONFIG_DWMAC_ROCKCHIP) += dwmac-rk.o
obj-$(CONFIG_DWMAC_SOCFPGA) += dwmac-altr-socfpga.o
+obj-$(CONFIG_DWMAC_STARFIVE) += dwmac-starfive.o
obj-$(CONFIG_DWMAC_STI) += dwmac-sti.o
obj-$(CONFIG_DWMAC_STM32) += dwmac-stm32.o
obj-$(CONFIG_DWMAC_SUNXI) += dwmac-sunxi.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
new file mode 100644
index 000000000000..ef5a769b1c75
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
@@ -0,0 +1,121 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * StarFive DWMAC platform driver
+ *
+ * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk>
+ * Copyright (C) 2022 StarFive Technology Co., Ltd.
+ *
+ */
+
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+
+#include "stmmac_platform.h"
+
+struct starfive_dwmac {
+ struct device *dev;
+ struct clk *clk_tx;
+};
+
+static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed)
+{
+ struct starfive_dwmac *dwmac = priv;
+ unsigned long rate;
+ int err;
+
+ switch (speed) {
+ case SPEED_1000:
+ rate = 125000000;
+ break;
+ case SPEED_100:
+ rate = 25000000;
+ break;
+ case SPEED_10:
+ rate = 2500000;
+ break;
+ default:
+ dev_err(dwmac->dev, "invalid speed %u\n", speed);
+ break;
+ }
+
+ err = clk_set_rate(dwmac->clk_tx, rate);
+ if (err)
+ dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
+}
+
+static int starfive_dwmac_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct starfive_dwmac *dwmac;
+ struct clk *clk_gtx;
+ int err;
+
+ err = stmmac_get_platform_resources(pdev, &stmmac_res);
+ if (err)
+ return err;
+
+ plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
+ if (IS_ERR(plat_dat)) {
+ dev_err(&pdev->dev, "dt configuration failed\n");
+ return PTR_ERR(plat_dat);
+ }
+
+ 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),
+ "error getting tx clock\n");
+
+ clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
+ if (IS_ERR(clk_gtx))
+ return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),
+ "error getting gtx clock\n");
+
+ /* Generally, the rgmii_tx clock is provided by the internal clock,
+ * which needs to match the corresponding clock frequency according
+ * to different speeds. If the rgmii_tx clock is provided by the
+ * external rgmii_rxin, there is no need to configure the clock
+ * internally, because rgmii_rxin will be adaptively adjusted.
+ */
+ if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))
+ plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed;
+
+ dwmac->dev = &pdev->dev;
+ plat_dat->bsp_priv = dwmac;
+ plat_dat->dma_cfg->dche = true;
+
+ err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
+ if (err) {
+ stmmac_remove_config_dt(pdev, plat_dat);
+ return err;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id starfive_dwmac_match[] = {
+ { .compatible = "starfive,jh7110-dwmac" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, starfive_dwmac_match);
+
+static struct platform_driver starfive_dwmac_driver = {
+ .probe = starfive_dwmac_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "starfive-dwmac",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = starfive_dwmac_match,
+ },
+};
+module_platform_driver(starfive_dwmac_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("StarFive DWMAC platform driver");
+MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");
+MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");