dpaa2-eth: add APIs of 1588 single step timestamping

This patch is to add APIs of 1588 single step timestamping.

- dpni_set_single_step_cfg
- dpni_get_single_step_cfg
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/freescale/dpaa2/dpni-cmd.h

 /* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
 /* Copyright 2013-2016 Freescale Semiconductor Inc.
  * Copyright 2016 NXP
+ * Copyright 2020 NXP
  */
 #ifndef _FSL_DPNI_CMD_H
 #define _FSL_DPNI_CMD_H
@@ -90,6 +91,9 @@
 #define DPNI_CMDID_SET_RX_HASH_DIST			DPNI_CMD(0x274)
 #define DPNI_CMDID_GET_LINK_CFG				DPNI_CMD(0x278)
 
+#define DPNI_CMDID_SET_SINGLE_STEP_CFG			DPNI_CMD(0x279)
+#define DPNI_CMDID_GET_SINGLE_STEP_CFG			DPNI_CMD(0x27a)
+
 /* Macros for accessing command fields smaller than 1byte */
 #define DPNI_MASK(field)	\
 	GENMASK(DPNI_##field##_SHIFT + DPNI_##field##_SIZE - 1, \
@@ -639,4 +643,21 @@ struct dpni_cmd_set_tx_shaping {
 	u8 coupled;
 };
 
+#define DPNI_PTP_ENABLE_SHIFT			0
+#define DPNI_PTP_ENABLE_SIZE			1
+#define DPNI_PTP_CH_UPDATE_SHIFT		1
+#define DPNI_PTP_CH_UPDATE_SIZE			1
+
+struct dpni_cmd_single_step_cfg {
+	__le16 flags;
+	__le16 offset;
+	__le32 peer_delay;
+};
+
+struct dpni_rsp_single_step_cfg {
+	__le16 flags;
+	__le16 offset;
+	__le32 peer_delay;
+};
+
 #endif /* _FSL_DPNI_CMD_H */

drivers/net/ethernet/freescale/dpaa2/dpni.c

 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 /* Copyright 2013-2016 Freescale Semiconductor Inc.
  * Copyright 2016 NXP
+ * Copyright 2020 NXP
  */
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1999,3 +2000,81 @@ int dpni_set_tx_shaping(struct fsl_mc_io *mc_io,
 	/* send command to mc*/
 	return mc_send_command(mc_io, &cmd);
 }
+
+/**
+ * dpni_get_single_step_cfg() - return current configuration for
+ *                              single step PTP
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPNI object
+ * @ptp_cfg:	ptp single step configuration
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ *
+ */
+int dpni_get_single_step_cfg(struct fsl_mc_io *mc_io,
+			     u32 cmd_flags,
+			     u16 token,
+			     struct dpni_single_step_cfg *ptp_cfg)
+{
+	struct dpni_rsp_single_step_cfg *rsp_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPNI_CMDID_GET_SINGLE_STEP_CFG,
+					  cmd_flags, token);
+	/* send command to mc*/
+	err =  mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	/* read command response */
+	rsp_params = (struct dpni_rsp_single_step_cfg *)cmd.params;
+	ptp_cfg->offset = le16_to_cpu(rsp_params->offset);
+	ptp_cfg->en = dpni_get_field(le16_to_cpu(rsp_params->flags),
+				     PTP_ENABLE) ? 1 : 0;
+	ptp_cfg->ch_update = dpni_get_field(le16_to_cpu(rsp_params->flags),
+					    PTP_CH_UPDATE) ? 1 : 0;
+	ptp_cfg->peer_delay = le32_to_cpu(rsp_params->peer_delay);
+
+	return err;
+}
+
+/**
+ * dpni_set_single_step_cfg() - enable/disable and configure single step PTP
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPNI object
+ * @ptp_cfg:	ptp single step configuration
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ *
+ * The function has effect only when dpni object is connected to a dpmac
+ * object. If the dpni is not connected to a dpmac the configuration will
+ * be stored inside and applied when connection is made.
+ */
+int dpni_set_single_step_cfg(struct fsl_mc_io *mc_io,
+			     u32 cmd_flags,
+			     u16 token,
+			     struct dpni_single_step_cfg *ptp_cfg)
+{
+	struct dpni_cmd_single_step_cfg *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+	u16 flags;
+
+	/* prepare command */
+	cmd.header = mc_encode_cmd_header(DPNI_CMDID_SET_SINGLE_STEP_CFG,
+					  cmd_flags, token);
+	cmd_params = (struct dpni_cmd_single_step_cfg *)cmd.params;
+	cmd_params->offset = cpu_to_le16(ptp_cfg->offset);
+	cmd_params->peer_delay = cpu_to_le32(ptp_cfg->peer_delay);
+
+	flags = le16_to_cpu(cmd_params->flags);
+	dpni_set_field(flags, PTP_ENABLE, !!ptp_cfg->en);
+	dpni_set_field(flags, PTP_CH_UPDATE, !!ptp_cfg->ch_update);
+	cmd_params->flags = cpu_to_le16(flags);
+
+	/* send command to mc*/
+	return mc_send_command(mc_io, &cmd);
+}

drivers/net/ethernet/freescale/dpaa2/dpni.h

 /* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
 /* Copyright 2013-2016 Freescale Semiconductor Inc.
  * Copyright 2016 NXP
+ * Copyright 2020 NXP
  */
 #ifndef __FSL_DPNI_H
 #define __FSL_DPNI_H
@@ -1079,4 +1080,34 @@ int dpni_set_tx_shaping(struct fsl_mc_io *mc_io,
 			const struct dpni_tx_shaping_cfg *tx_er_shaper,
 			int coupled);
 
+/**
+ * struct dpni_single_step_cfg - configure single step PTP (IEEE 1588)
+ * @en:		enable single step PTP. When enabled the PTPv1 functionality
+ *		will not work. If the field is zero, offset and ch_update
+ *		parameters will be ignored
+ * @offset:	start offset from the beginning of the frame where
+ *		timestamp field is found. The offset must respect all MAC
+ *		headers, VLAN tags and other protocol headers
+ * @ch_update:	when set UDP checksum will be updated inside packet
+ * @peer_delay:	For peer-to-peer transparent clocks add this value to the
+ *		correction field in addition to the transient time update.
+ *		The value expresses nanoseconds.
+ */
+struct dpni_single_step_cfg {
+	u8	en;
+	u8	ch_update;
+	u16	offset;
+	u32	peer_delay;
+};
+
+int dpni_set_single_step_cfg(struct fsl_mc_io *mc_io,
+			     u32 cmd_flags,
+			     u16 token,
+			     struct dpni_single_step_cfg *ptp_cfg);
+
+int dpni_get_single_step_cfg(struct fsl_mc_io *mc_io,
+			     u32 cmd_flags,
+			     u16 token,
+			     struct dpni_single_step_cfg *ptp_cfg);
+
 #endif /* __FSL_DPNI_H */