[PATCH v4 5/7] net: stmmac: Add glue layer for StarFive JH7110 SoCs

Yanhong Wang
2023-01-18T06:44:17Z

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

Signed-off-by: Yanhong Wang <yanhong.wang@starfivetech.com>
Co-developed-by: Emil Renner Berthing <kernel@esmil.dk>
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
---
MAINTAINERS | 1 +
drivers/net/ethernet/stmicro/stmmac/Kconfig | 12 ++
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
.../stmicro/stmmac/dwmac-starfive-plat.c | 118 ++++++++++++++++++
4 files changed, 132 insertions(+)
create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 56be59bb09f7..5b50b52d3dbb 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19609,6 +19609,7 @@ F: include/dt-bindings/clock/starfive*
STARFIVE DWMAC GLUE LAYER
M: Yanhong Wang <yanhong.wang@starfivetech.com>
S: Maintained
+F: Documentation/devicetree/bindings/net/dwmac-starfive-plat.c
F: Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml

STARFIVE PINCTRL DRIVER
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 31ff35174034..f9a4ad4abd54 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -235,6 +235,18 @@ config DWMAC_INTEL_PLAT
the stmmac device driver. This driver is used for the Intel Keem Bay
SoC.

+config DWMAC_STARFIVE_PLAT
+ tristate "StarFive dwmac support"
+ depends on OF && COMMON_CLK
+ depends on STMMAC_ETH
+ default SOC_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_VISCONTI
tristate "Toshiba Visconti DWMAC support"
default ARCH_VISCONTI
diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index d4e12e9ace4f..a63ab0ab5071 100644
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_DWMAC_DWC_QOS_ETH) += dwmac-dwc-qos-eth.o
obj-$(CONFIG_DWMAC_INTEL_PLAT) += dwmac-intel-plat.o
obj-$(CONFIG_DWMAC_GENERIC) += dwmac-generic.o
obj-$(CONFIG_DWMAC_IMX8) += dwmac-imx.o
+obj-$(CONFIG_DWMAC_STARFIVE_PLAT) += dwmac-starfive-plat.o
obj-$(CONFIG_DWMAC_VISCONTI) += dwmac-visconti.o
stmmac-platform-objs:= stmmac_platform.o
dwmac-altr-socfpga-objs := altr_tse_pcs.o dwmac-socfpga.o
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c
new file mode 100644
index 000000000000..e441d920933a
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive-plat.c
@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * StarFive DWMAC platform driver
+ *
+ * Copyright(C) 2022 StarFive Technology Co., Ltd.
+ *
+ */
+
+#include <linux/of_device.h>
+
+#include "stmmac_platform.h"
+
+struct starfive_dwmac {
+ struct device *dev;
+ struct clk *clk_tx;
+ struct clk *clk_gtx;
+ struct clk *clk_gtxc;
+};
+
+static void starfive_eth_plat_fix_mac_speed(void *priv, unsigned int speed)
+{
+ struct starfive_dwmac *dwmac = priv;
+ unsigned long rate;
+ int err;
+
+ rate = clk_get_rate(dwmac->clk_gtx);
+
+ 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_gtx, rate);
+ if (err)
+ dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
+}
+
+static int starfive_eth_plat_probe(struct platform_device *pdev)
+{
+ struct plat_stmmacenet_data *plat_dat;
+ struct stmmac_resources stmmac_res;
+ struct starfive_dwmac *dwmac;
+ 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");
+
+ dwmac->clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");
+ if (IS_ERR(dwmac->clk_gtx))
+ return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_gtx),
+ "error getting gtx clock\n");
+
+ dwmac->clk_gtxc = devm_clk_get_enabled(&pdev->dev, "gtxc");
+ if (IS_ERR(dwmac->clk_gtxc))
+ return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_gtxc),
+ "error getting gtxc clock\n");
+
+ dwmac->dev = &pdev->dev;
+ plat_dat->fix_mac_speed = starfive_eth_plat_fix_mac_speed;
+ plat_dat->init = NULL;
+ 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_eth_plat_match[] = {
+ { .compatible = "starfive,jh7110-dwmac" },
+ { }
+};
+
+static struct platform_driver starfive_eth_plat_driver = {
+ .probe = starfive_eth_plat_probe,
+ .remove = stmmac_pltfr_remove,
+ .driver = {
+ .name = "starfive-eth-plat",
+ .pm = &stmmac_pltfr_pm_ops,
+ .of_match_table = starfive_eth_plat_match,
+ },
+};
+
+module_platform_driver(starfive_eth_plat_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("StarFive DWMAC platform driver");
+MODULE_AUTHOR("Yanhong Wang <yanhong.wang@starfivetech.com>");
--
2.17.1