net: stmmac: Add glue layer for StarFive JH7110 SoC

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

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>
Tested-by: Tommaso Merciai <tomm.merciai@gmail.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 32717d4..cc39543 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19638,6 +19638,7 @@ 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 31ff351..b5e95e6 100644 (file)
--- 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 d4e12e9..09e3c14 100644 (file)
--- 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 (file)
index 0000000..ef5a769
--- /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>");