net: stmmac: add support for RZ/N1 GMAC

Add support for the Renesas RZ/N1 GMAC. This support can make use of a
custom RZ/N1 PCS which is fetched by parsing the pcs-handle device tree
property.

Signed-off-by: Clément Léger <clement.leger@bootlin.com>
Co-developed-by: Romain Gantois <romain.gantois@bootlin.com>
Signed-off-by: Romain Gantois <romain.gantois@bootlin.com>
Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Hariprasad Kelam <hkelam@marvell.com>
Link: https://lore.kernel.org/r/20240513-rzn1-gmac1-v7-6-6acf58b5440d@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/MAINTAINERS b/MAINTAINERS
index 757206d860489d39f8b29fe14f264ee43bb08290..40eb26e6c60cf6631162058a32cb504bcc26b639 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18874,6 +18874,12 @@ F:     include/dt-bindings/net/pcs-rzn1-miic.h
 F:     include/linux/pcs-rzn1-miic.h
 F:     net/dsa/tag_rzn1_a5psw.c
 
+RENESAS RZ/N1 DWMAC GLUE LAYER
+M:     Romain Gantois <romain.gantois@bootlin.com>
+S:     Maintained
+F:     Documentation/devicetree/bindings/net/renesas,rzn1-gmac.yaml
+F:     drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
+
 RENESAS RZ/N1 RTC CONTROLLER DRIVER
 M:     Miquel Raynal <miquel.raynal@bootlin.com>
 L:     linux-rtc@vger.kernel.org

diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
index 4ec61f1ee71a25dbd90c373068c585b1c9be8577..05cc07b8f48c03e91184db01e5226bfa99e3b2b2 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
+++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
@@ -142,6 +142,18 @@ config DWMAC_ROCKCHIP
          This selects the Rockchip RK3288 SoC glue layer support for
          the stmmac device driver.
 
+config DWMAC_RZN1
+       tristate "Renesas RZ/N1 dwmac support"
+       default ARCH_RZN1
+       depends on OF && (ARCH_RZN1 || COMPILE_TEST)
+       select PCS_RZN1_MIIC
+       help
+         Support for Ethernet controller on Renesas RZ/N1 SoC family.
+
+         This selects the Renesas RZ/N1 SoC glue layer support for
+         the stmmac device driver. This support can make use of a custom MII
+         converter PCS device.
+
 config DWMAC_SOCFPGA
        tristate "SOCFPGA dwmac support"
        default ARCH_INTEL_SOCFPGA

diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
index 26cad4344701e763ee52f4a774bf144045a959eb..c2f0e91f6bf83d34abe81be9aa44ec9ad778fc0d 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/Makefile
+++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
@@ -21,6 +21,7 @@ obj-$(CONFIG_DWMAC_MEDIATEK)  += dwmac-mediatek.o
 obj-$(CONFIG_DWMAC_MESON)      += dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_QCOM_ETHQOS)        += dwmac-qcom-ethqos.o
 obj-$(CONFIG_DWMAC_ROCKCHIP)   += dwmac-rk.o
+obj-$(CONFIG_DWMAC_RZN1)       += dwmac-rzn1.o
 obj-$(CONFIG_DWMAC_SOCFPGA)    += dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STARFIVE)   += dwmac-starfive.o
 obj-$(CONFIG_DWMAC_STI)                += dwmac-sti.o

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
new file mode 100644 (file)
index 0000000..848cf3c
--- /dev/null
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2024 Schneider-Electric
+ *
+ * Clément Léger <clement.leger@bootlin.com>
+ */
+
+#include <linux/of.h>
+#include <linux/pcs-rzn1-miic.h>
+#include <linux/phylink.h>
+#include <linux/platform_device.h>
+
+#include "stmmac_platform.h"
+#include "stmmac.h"
+
+static int rzn1_dwmac_pcs_init(struct stmmac_priv *priv)
+{
+       struct device_node *np = priv->device->of_node;
+       struct device_node *pcs_node;
+       struct phylink_pcs *pcs;
+
+       pcs_node = of_parse_phandle(np, "pcs-handle", 0);
+
+       if (pcs_node) {
+               pcs = miic_create(priv->device, pcs_node);
+               of_node_put(pcs_node);
+               if (IS_ERR(pcs))
+                       return PTR_ERR(pcs);
+
+               priv->hw->phylink_pcs = pcs;
+       }
+
+       return 0;
+}
+
+static void rzn1_dwmac_pcs_exit(struct stmmac_priv *priv)
+{
+       if (priv->hw->phylink_pcs)
+               miic_destroy(priv->hw->phylink_pcs);
+}
+
+static int rzn1_dwmac_probe(struct platform_device *pdev)
+{
+       struct plat_stmmacenet_data *plat_dat;
+       struct stmmac_resources stmmac_res;
+       struct device *dev = &pdev->dev;
+       int ret;
+
+       ret = stmmac_get_platform_resources(pdev, &stmmac_res);
+       if (ret)
+               return ret;
+
+       plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
+       if (IS_ERR(plat_dat))
+               return PTR_ERR(plat_dat);
+
+       plat_dat->bsp_priv = plat_dat;
+       plat_dat->pcs_init = rzn1_dwmac_pcs_init;
+       plat_dat->pcs_exit = rzn1_dwmac_pcs_exit;
+
+       ret = stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
+       if (ret)
+               return ret;
+
+       return 0;
+}
+
+static const struct of_device_id rzn1_dwmac_match[] = {
+       { .compatible = "renesas,rzn1-gmac" },
+       { }
+};
+MODULE_DEVICE_TABLE(of, rzn1_dwmac_match);
+
+static struct platform_driver rzn1_dwmac_driver = {
+       .probe  = rzn1_dwmac_probe,
+       .remove_new = stmmac_pltfr_remove,
+       .driver = {
+               .name           = "rzn1-dwmac",
+               .of_match_table = rzn1_dwmac_match,
+       },
+};
+module_platform_driver(rzn1_dwmac_driver);
+
+MODULE_AUTHOR("Clément Léger <clement.leger@bootlin.com>");
+MODULE_DESCRIPTION("Renesas RZN1 DWMAC specific glue layer");
+MODULE_LICENSE("GPL");