net: ethernet: stmicro: stmmac: Add loopback interface for rockchip

Add some user interface for usage, for example at RK3399:

  - scan rgmii delayline:

    echo (speed:10 100 1000) > /sys/devices/platform/fe300000.ethernet/phy_lb_scan

  - loopback test:

    echo (speed:10 100 1000) > /sys/devices/platform/fe300000.ethernet/phy_lb
    echo (speed:10 100 1000) > /sys/devices/platform/fe300000.ethernet/mac_lb

  - set/show delayline

    cat /sys/devices/platform/fe300000.ethernet/rgmii_delayline
    echo (tx delayline) (rx delayline) > /sys/devices/platform/fe300000.ethernet/rgmii_delayline

Signed-off-by: David Wu <david.wu@rock-chips.com>
Change-Id: Ic38d7f4e12987d5ebc1d81f693f955e8105657ac

drivers/net/ethernet/stmicro/stmmac/Makefile

@@ -15,7 +15,7 @@ obj-$(CONFIG_DWMAC_IPQ806X)	+= dwmac-ipq806x.o
 obj-$(CONFIG_DWMAC_LPC18XX)	+= dwmac-lpc18xx.o
 obj-$(CONFIG_DWMAC_MESON)	+= dwmac-meson.o dwmac-meson8b.o
 obj-$(CONFIG_DWMAC_OXNAS)	+= dwmac-oxnas.o
-obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o
+obj-$(CONFIG_DWMAC_ROCKCHIP)	+= dwmac-rk.o dwmac-rk-tool.o
 obj-$(CONFIG_DWMAC_SOCFPGA)	+= dwmac-altr-socfpga.o
 obj-$(CONFIG_DWMAC_STI)		+= dwmac-sti.o
 obj-$(CONFIG_DWMAC_STM32)	+= dwmac-stm32.o

drivers/net/ethernet/stmicro/stmmac/dwmac-rk-tool.h

@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: (GPL-2.0+ OR MIT) */
+/*
+ * Copyright (c) 2020 Fuzhou Rockchip Electronics Co., Ltd
+ */
+
+#ifndef __DWMAC_RK_TOOL_H__
+#define __DWMAC_RK_TOOL_H__
+
+#include <linux/phy.h>
+#include "stmmac.h"
+
+void dwmac_rk_set_rgmii_delayline(struct stmmac_priv *priv, int tx_delay, int rx_delay);
+void dwmac_rk_get_rgmii_delayline(struct stmmac_priv *priv, int *tx_delay, int *rx_delay);
+int dwmac_rk_get_phy_interface(struct stmmac_priv *priv);
+
+int dwmac_rk_create_loopback_sysfs(struct device *dev);
+int dwmac_rk_remove_loopback_sysfs(struct device *device);
+
+#ifdef CONFIG_DWMAC_RK_AUTO_DELAYLINE
+int dwmac_rk_get_rgmii_delayline_from_vendor(struct stmmac_priv *priv);
+int dwmac_rk_search_rgmii_delayline(struct stmmac_priv *priv);
+#endif
+
+#endif /* __DWMAC_RK_TOOL_H__ */
+

drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c

@@ -33,6 +33,7 @@
 #include <linux/pm_runtime.h>
 #include <linux/soc/rockchip/rk_vendor_storage.h>
 #include "stmmac_platform.h"
+#include "dwmac-rk-tool.h"
 
 struct rk_priv_data;
 struct rk_gmac_ops {
@@ -1569,6 +1570,40 @@ static void rk_fix_speed(void *priv, unsigned int speed)
 	}
 }
 
+void dwmac_rk_set_rgmii_delayline(struct stmmac_priv *priv,
+				  int tx_delay, int rx_delay)
+{
+	struct rk_priv_data *bsp_priv = priv->plat->bsp_priv;
+
+	if (bsp_priv->ops->set_to_rgmii) {
+		bsp_priv->ops->set_to_rgmii(bsp_priv, tx_delay, rx_delay);
+		bsp_priv->tx_delay = tx_delay;
+		bsp_priv->rx_delay = rx_delay;
+	}
+}
+EXPORT_SYMBOL(dwmac_rk_set_rgmii_delayline);
+
+void dwmac_rk_get_rgmii_delayline(struct stmmac_priv *priv,
+				  int *tx_delay, int *rx_delay)
+{
+	struct rk_priv_data *bsp_priv = priv->plat->bsp_priv;
+
+	if (!bsp_priv->ops->set_to_rgmii)
+		return;
+
+	*tx_delay = bsp_priv->tx_delay;
+	*rx_delay = bsp_priv->rx_delay;
+}
+EXPORT_SYMBOL(dwmac_rk_get_rgmii_delayline);
+
+int dwmac_rk_get_phy_interface(struct stmmac_priv *priv)
+{
+	struct rk_priv_data *bsp_priv = priv->plat->bsp_priv;
+
+	return bsp_priv->phy_iface;
+}
+EXPORT_SYMBOL(dwmac_rk_get_phy_interface);
+
 void __weak rk_devinfo_get_eth_mac(u8 *mac)
 {
 }

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -48,6 +48,7 @@
 #include <net/pkt_cls.h>
 #include "stmmac_ptp.h"
 #include "stmmac.h"
+#include "dwmac-rk-tool.h"
 #include <linux/reset.h>
 #include <linux/of_mdio.h>
 #include "dwmac1000.h"
@@ -4446,6 +4447,14 @@ int stmmac_dvr_probe(struct device *device,
 			    __func__);
 #endif
 
+	ret = dwmac_rk_create_loopback_sysfs(device);
+	if (ret) {
+		netdev_err(priv->dev, "%s: ERROR %i create loopback sysfs\n",
+			   __func__, ret);
+		unregister_netdev(ndev);
+		goto error_netdev_register;
+	}
+
 	return ret;
 
 error_netdev_register: