@@ -44,6 +44,9 @@ config LED_TRIGGER_PHY
<Speed in megabits>Mbps OR <Speed in gigabits>Gbps OR link
for any speed known to the PHY.
+config OPEN_ALLIANCE_HELPERS
+ bool
+
config PHYLIB_LEDS
def_bool OF
depends on LEDS_CLASS=y || LEDS_CLASS=PHYLIB
@@ -22,6 +22,7 @@ endif
obj-$(CONFIG_MDIO_DEVRES) += mdio_devres.o
libphy-$(CONFIG_SWPHY) += swphy.o
libphy-$(CONFIG_LED_TRIGGER_PHY) += phy_led_triggers.o
+libphy-$(CONFIG_OPEN_ALLIANCE_HELPERS) += open_alliance_helpers.o
obj-$(CONFIG_PHYLINK) += phylink.o
obj-$(CONFIG_PHYLIB) += libphy.o
new file mode 100644
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * open_alliance_helpers.c - OPEN Alliance specific PHY diagnostic helpers
+ *
+ * This file contains helper functions for implementing advanced diagnostic
+ * features as specified by the OPEN Alliance for automotive Ethernet PHYs.
+ * These helpers include functionality for Time Delay Reflection (TDR), dynamic
+ * channel quality assessment, and other PHY diagnostics.
+ *
+ * For more information on the specifications, refer to the OPEN Alliance
+ * documentation: https://opensig.org/automotive-ethernet-specifications/
+ * Currently following specifications are partially or fully implemented:
+ * - Advanced diagnostic features for 1000BASE-T1 automotive Ethernet PHYs.
+ * TC12 - advanced PHY features.
+ * https://opensig.org/wp-content/uploads/2024/03/Advanced_PHY_features_for_automotive_Ethernet_v2.0_fin.pdf
+ */
+
+#include <linux/bitfield.h>
+#include <linux/ethtool_netlink.h>
+
+#include "open_alliance_helpers.h"
+
+/**
+ * oa_1000bt1_get_ethtool_cable_result_code - Convert TDR status to ethtool
+ * result code
+ * @reg_value: Value read from the TDR register
+ *
+ * This function takes a register value from the HDD.TDR register and converts
+ * the TDR status to the corresponding ethtool cable test result code.
+ *
+ * Return: The appropriate ethtool result code based on the TDR status
+ */
+int oa_1000bt1_get_ethtool_cable_result_code(u16 reg_value)
+{
+ u8 tdr_status = FIELD_GET(OA_1000BT1_HDD_TDR_STATUS_MASK, reg_value);
+ u8 dist_val = FIELD_GET(OA_1000BT1_HDD_TDR_DISTANCE_MASK, reg_value);
+
+ switch (tdr_status) {
+ case OA_1000BT1_HDD_TDR_STATUS_CABLE_OK:
+ return ETHTOOL_A_CABLE_RESULT_CODE_OK;
+ case OA_1000BT1_HDD_TDR_STATUS_OPEN:
+ return ETHTOOL_A_CABLE_RESULT_CODE_OPEN;
+ case OA_1000BT1_HDD_TDR_STATUS_SHORT:
+ return ETHTOOL_A_CABLE_RESULT_CODE_SAME_SHORT;
+ case OA_1000BT1_HDD_TDR_STATUS_NOISE:
+ return ETHTOOL_A_CABLE_RESULT_CODE_NOISE;
+ default:
+ if (dist_val == OA_1000BT1_HDD_TDR_DISTANCE_RESOLUTION_NOT_POSSIBLE)
+ return ETHTOOL_A_CABLE_RESULT_CODE_RESOLUTION_NOT_POSSIBLE;
+ return ETHTOOL_A_CABLE_RESULT_CODE_UNSPEC;
+ }
+}
+EXPORT_SYMBOL_GPL(oa_1000bt1_get_ethtool_cable_result_code);
+
+/**
+ * oa_1000bt1_get_tdr_distance - Get distance to the main fault from TDR
+ * register value
+ * @reg_value: Value read from the TDR register
+ *
+ * This function takes a register value from the HDD.TDR register and extracts
+ * the distance to the main fault detected by the TDR feature. The distance is
+ * measured in centimeters and ranges from 0 to 3100 centimeters. If the
+ * distance is not available (0x3f), the function returns -ERANGE.
+ *
+ * Return: The distance to the main fault in centimeters, or -ERANGE if the
+ * resolution is not possible.
+ */
+int oa_1000bt1_get_tdr_distance(u16 reg_value)
+{
+ u8 dist_val = FIELD_GET(OA_1000BT1_HDD_TDR_DISTANCE_MASK, reg_value);
+
+ if (dist_val == OA_1000BT1_HDD_TDR_DISTANCE_RESOLUTION_NOT_POSSIBLE)
+ return -ERANGE;
+
+ return dist_val * 100;
+}
+EXPORT_SYMBOL_GPL(oa_1000bt1_get_tdr_distance);
new file mode 100644
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef OPEN_ALLIANCE_HELPERS_H
+#define OPEN_ALLIANCE_HELPERS_H
+
+/*
+ * These defines reflect the TDR (Time Delay Reflection) diagnostic feature
+ * for 1000BASE-T1 automotive Ethernet PHYs as specified by the OPEN Alliance.
+ *
+ * The register values are part of the HDD.TDR register, which provides
+ * information about the cable status and faults. The exact register offset
+ * is device-specific and should be provided by the driver.
+ */
+#define OA_1000BT1_HDD_TDR_ACTIVATION_MASK GENMASK(1, 0)
+#define OA_1000BT1_HDD_TDR_ACTIVATION_OFF 1
+#define OA_1000BT1_HDD_TDR_ACTIVATION_ON 2
+
+#define OA_1000BT1_HDD_TDR_STATUS_MASK GENMASK(7, 4)
+#define OA_1000BT1_HDD_TDR_STATUS_SHORT 3
+#define OA_1000BT1_HDD_TDR_STATUS_OPEN 6
+#define OA_1000BT1_HDD_TDR_STATUS_NOISE 5
+#define OA_1000BT1_HDD_TDR_STATUS_CABLE_OK 7
+#define OA_1000BT1_HDD_TDR_STATUS_TEST_IN_PROGRESS 8
+#define OA_1000BT1_HDD_TDR_STATUS_TEST_NOT_POSSIBLE 13
+
+/*
+ * OA_1000BT1_HDD_TDR_DISTANCE_MASK:
+ * This mask is used to extract the distance to the first/main fault
+ * detected by the TDR feature. Each bit represents an approximate distance
+ * of 1 meter, ranging from 0 to 31 meters. The exact interpretation of the
+ * bits may vary, but generally:
+ * 000000 = no error
+ * 000001 = error about 0-1m away
+ * 000010 = error between 1-2m away
+ * ...
+ * 011111 = error about 30-31m away
+ * 111111 = resolution not possible / out of distance
+ */
+#define OA_1000BT1_HDD_TDR_DISTANCE_MASK GENMASK(13, 8)
+#define OA_1000BT1_HDD_TDR_DISTANCE_NO_ERROR 0
+#define OA_1000BT1_HDD_TDR_DISTANCE_RESOLUTION_NOT_POSSIBLE 0x3f
+
+int oa_1000bt1_get_ethtool_cable_result_code(u16 reg_value);
+int oa_1000bt1_get_tdr_distance(u16 reg_value);
+
+#endif /* OPEN_ALLIANCE_HELPERS_H */
+
Introduce helper functions specific to Open Alliance diagnostics, integrating them into the PHY framework. Currently, these helpers are limited to 1000BaseT1 specific TDR functionality. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> --- changes v5: - make open_alliance_helpers.o part of libphy changes v4: - fix compile error for i386 and m68k changes v3: - make it optional - move headers to the drivers/net/phy folder --- drivers/net/phy/Kconfig | 3 + drivers/net/phy/Makefile | 1 + drivers/net/phy/open_alliance_helpers.c | 77 +++++++++++++++++++++++++ drivers/net/phy/open_alliance_helpers.h | 47 +++++++++++++++ 4 files changed, 128 insertions(+) create mode 100644 drivers/net/phy/open_alliance_helpers.c create mode 100644 drivers/net/phy/open_alliance_helpers.h