[PATCH net-next v6 6/7] net: stmmac: add support for RZ/N1 GMAC

Romain Gantois
2024-05-10T07:37:40Z

From: Clément Léger <clement.leger@bootlin.com>

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>
---
MAINTAINERS | 6 ++
drivers/net/ethernet/stmicro/stmmac/Kconfig | 12 ++++
drivers/net/ethernet/stmicro/stmmac/Makefile | 1 +
drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c | 86 ++++++++++++++++++++++++
4 files changed, 105 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index b81b2be60b774..95bb09aacf181 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -18868,6 +18868,12 @@ 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 4ec61f1ee71a2..05cc07b8f48c0 100644
--- 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 26cad4344701e..c2f0e91f6bf83 100644
--- 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
index 0000000000000..848cf3c01f4ab
--- /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");

--
2.44.0