staging: fsl-dpaa2/rtc: add rtc driver

This patch is to add driver for the DPAA2 1588 timer module (RTC)
which interfaces to up to an unlimited number of 10/100/1000 or
10G ethernet MACs, providing current time, alarm, and fiper support.
The 1588 IP control block includes these distinctive features.

- External GPIO trigger for time-stamping
- 2 Time-stamp alarms
- 3 FIPER pulse generators
- Phase adjusted output timer clock

Currently this driver only supports basic functions like
settime/gettime/adjtime/adjfreq.
Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-dpaa2/Kconfig

@@ -24,3 +24,11 @@ config FSL_DPAA2_ETHSW
 	---help---
 	Driver for Freescale DPAA2 Ethernet Switch. Select
 	BRIDGE to have support for bridge tools.
+
+config FSL_DPAA2_PTP_CLOCK
+	tristate "Freescale DPAA2 PTP Clock"
+	depends on FSL_DPAA2
+	select PTP_1588_CLOCK
+	help
+	  This driver adds support for using the DPAA2 1588 timer module
+	  as a PTP clock.

drivers/staging/fsl-dpaa2/Makefile

@@ -2,5 +2,6 @@
 # Freescale DataPath Acceleration Architecture Gen2 (DPAA2) drivers
 #
 
-obj-$(CONFIG_FSL_DPAA2_ETH)	+= ethernet/
-obj-$(CONFIG_FSL_DPAA2_ETHSW)	+= ethsw/
+obj-$(CONFIG_FSL_DPAA2_ETH)		+= ethernet/
+obj-$(CONFIG_FSL_DPAA2_ETHSW)		+= ethsw/
+obj-$(CONFIG_FSL_DPAA2_PTP_CLOCK)	+= rtc/

drivers/staging/fsl-dpaa2/rtc/Makefile

+#
+# Makefile for the Freescale DPAA2 PTP clock
+#
+
+obj-$(CONFIG_FSL_DPAA2_PTP_CLOCK) += dpaa2-rtc.o
+
+dpaa2-rtc-objs := rtc.o dprtc.o

drivers/staging/fsl-dpaa2/rtc/dprtc-cmd.h

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2016-2018 NXP
+ */
+
+#ifndef _FSL_DPRTC_CMD_H
+#define _FSL_DPRTC_CMD_H
+
+/* DPRTC Version */
+#define DPRTC_VER_MAJOR			2
+#define DPRTC_VER_MINOR			0
+
+/* Command versioning */
+#define DPRTC_CMD_BASE_VERSION		1
+#define DPRTC_CMD_ID_OFFSET		4
+
+#define DPRTC_CMD(id)	(((id) << DPRTC_CMD_ID_OFFSET) | DPRTC_CMD_BASE_VERSION)
+
+/* Command IDs */
+#define DPRTC_CMDID_CLOSE			DPRTC_CMD(0x800)
+#define DPRTC_CMDID_OPEN			DPRTC_CMD(0x810)
+#define DPRTC_CMDID_CREATE			DPRTC_CMD(0x910)
+#define DPRTC_CMDID_DESTROY			DPRTC_CMD(0x990)
+#define DPRTC_CMDID_GET_API_VERSION		DPRTC_CMD(0xa10)
+
+#define DPRTC_CMDID_ENABLE			DPRTC_CMD(0x002)
+#define DPRTC_CMDID_DISABLE			DPRTC_CMD(0x003)
+#define DPRTC_CMDID_GET_ATTR			DPRTC_CMD(0x004)
+#define DPRTC_CMDID_RESET			DPRTC_CMD(0x005)
+#define DPRTC_CMDID_IS_ENABLED			DPRTC_CMD(0x006)
+
+#define DPRTC_CMDID_SET_IRQ_ENABLE		DPRTC_CMD(0x012)
+#define DPRTC_CMDID_GET_IRQ_ENABLE		DPRTC_CMD(0x013)
+#define DPRTC_CMDID_SET_IRQ_MASK		DPRTC_CMD(0x014)
+#define DPRTC_CMDID_GET_IRQ_MASK		DPRTC_CMD(0x015)
+#define DPRTC_CMDID_GET_IRQ_STATUS		DPRTC_CMD(0x016)
+#define DPRTC_CMDID_CLEAR_IRQ_STATUS		DPRTC_CMD(0x017)
+
+#define DPRTC_CMDID_SET_CLOCK_OFFSET		DPRTC_CMD(0x1d0)
+#define DPRTC_CMDID_SET_FREQ_COMPENSATION	DPRTC_CMD(0x1d1)
+#define DPRTC_CMDID_GET_FREQ_COMPENSATION	DPRTC_CMD(0x1d2)
+#define DPRTC_CMDID_GET_TIME			DPRTC_CMD(0x1d3)
+#define DPRTC_CMDID_SET_TIME			DPRTC_CMD(0x1d4)
+#define DPRTC_CMDID_SET_ALARM			DPRTC_CMD(0x1d5)
+#define DPRTC_CMDID_SET_PERIODIC_PULSE		DPRTC_CMD(0x1d6)
+#define DPRTC_CMDID_CLEAR_PERIODIC_PULSE	DPRTC_CMD(0x1d7)
+#define DPRTC_CMDID_SET_EXT_TRIGGER		DPRTC_CMD(0x1d8)
+#define DPRTC_CMDID_CLEAR_EXT_TRIGGER		DPRTC_CMD(0x1d9)
+#define DPRTC_CMDID_GET_EXT_TRIGGER_TIMESTAMP	DPRTC_CMD(0x1dA)
+
+/* Macros for accessing command fields smaller than 1byte */
+#define DPRTC_MASK(field)        \
+	GENMASK(DPRTC_##field##_SHIFT + DPRTC_##field##_SIZE - 1, \
+		DPRTC_##field##_SHIFT)
+#define dprtc_get_field(var, field)      \
+	(((var) & DPRTC_MASK(field)) >> DPRTC_##field##_SHIFT)
+
+#pragma pack(push, 1)
+struct dprtc_cmd_open {
+	__le32 dprtc_id;
+};
+
+struct dprtc_cmd_destroy {
+	__le32 object_id;
+};
+
+#define DPRTC_ENABLE_SHIFT	0
+#define DPRTC_ENABLE_SIZE	1
+
+struct dprtc_rsp_is_enabled {
+	u8 en;
+};
+
+struct dprtc_cmd_get_irq {
+	__le32 pad;
+	u8 irq_index;
+};
+
+struct dprtc_cmd_set_irq_enable {
+	u8 en;
+	u8 pad[3];
+	u8 irq_index;
+};
+
+struct dprtc_rsp_get_irq_enable {
+	u8 en;
+};
+
+struct dprtc_cmd_set_irq_mask {
+	__le32 mask;
+	u8 irq_index;
+};
+
+struct dprtc_rsp_get_irq_mask {
+	__le32 mask;
+};
+
+struct dprtc_cmd_get_irq_status {
+	__le32 status;
+	u8 irq_index;
+};
+
+struct dprtc_rsp_get_irq_status {
+	__le32 status;
+};
+
+struct dprtc_cmd_clear_irq_status {
+	__le32 status;
+	u8 irq_index;
+};
+
+struct dprtc_rsp_get_attributes {
+	__le32 pad;
+	__le32 id;
+};
+
+struct dprtc_cmd_set_clock_offset {
+	__le64 offset;
+};
+
+struct dprtc_get_freq_compensation {
+	__le32 freq_compensation;
+};
+
+struct dprtc_time {
+	__le64 time;
+};
+
+struct dprtc_rsp_get_api_version {
+	__le16 major;
+	__le16 minor;
+};
+
+#pragma pack(pop)
+
+#endif /* _FSL_DPRTC_CMD_H */

drivers/staging/fsl-dpaa2/rtc/dprtc.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2016-2018 NXP
+ */
+
+#include <linux/fsl/mc.h>
+
+#include "dprtc.h"
+#include "dprtc-cmd.h"
+
+/**
+ * dprtc_open() - Open a control session for the specified object.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @dprtc_id:	DPRTC unique ID
+ * @token:	Returned token; use in subsequent API calls
+ *
+ * This function can be used to open a control session for an
+ * already created object; an object may have been declared in
+ * the DPL or by calling the dprtc_create function.
+ * This function returns a unique authentication token,
+ * associated with the specific object ID and the specific MC
+ * portal; this token must be used in all subsequent commands for
+ * this specific object
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_open(struct fsl_mc_io *mc_io,
+	       u32 cmd_flags,
+	       int dprtc_id,
+	       u16 *token)
+{
+	struct dprtc_cmd_open *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_OPEN,
+					  cmd_flags,
+					  0);
+	cmd_params = (struct dprtc_cmd_open *)cmd.params;
+	cmd_params->dprtc_id = cpu_to_le32(dprtc_id);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	*token = mc_cmd_hdr_read_token(&cmd);
+
+	return 0;
+}
+
+/**
+ * dprtc_close() - Close the control session of the object
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ *
+ * After this function is called, no further operations are
+ * allowed on the object without opening a new control session.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_close(struct fsl_mc_io *mc_io,
+		u32 cmd_flags,
+		u16 token)
+{
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_CLOSE, cmd_flags,
+					  token);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_create() - Create the DPRTC object.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @dprc_token:	Parent container token; '0' for default container
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @cfg:	Configuration structure
+ * @obj_id:	Returned object id
+ *
+ * Create the DPRTC object, allocate required resources and
+ * perform required initialization.
+ *
+ * The function accepts an authentication token of a parent
+ * container that this object should be assigned to. The token
+ * can be '0' so the object will be assigned to the default container.
+ * The newly created object can be opened with the returned
+ * object id and using the container's associated tokens and MC portals.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_create(struct fsl_mc_io *mc_io,
+		 u16 dprc_token,
+		 u32 cmd_flags,
+		 const struct dprtc_cfg *cfg,
+		 u32 *obj_id)
+{
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_CREATE,
+					  cmd_flags,
+					  dprc_token);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	*obj_id = mc_cmd_read_object_id(&cmd);
+
+	return 0;
+}
+
+/**
+ * dprtc_destroy() - Destroy the DPRTC object and release all its resources.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @dprc_token: Parent container token; '0' for default container
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @object_id:	The object id; it must be a valid id within the container that
+ * created this object;
+ *
+ * The function accepts the authentication token of the parent container that
+ * created the object (not the one that currently owns the object). The object
+ * is searched within parent using the provided 'object_id'.
+ * All tokens to the object must be closed before calling destroy.
+ *
+ * Return:	'0' on Success; error code otherwise.
+ */
+int dprtc_destroy(struct fsl_mc_io *mc_io,
+		  u16 dprc_token,
+		  u32 cmd_flags,
+		  u32 object_id)
+{
+	struct dprtc_cmd_destroy *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_DESTROY,
+					  cmd_flags,
+					  dprc_token);
+	cmd_params = (struct dprtc_cmd_destroy *)cmd.params;
+	cmd_params->object_id = cpu_to_le32(object_id);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_enable() - Enable the DPRTC.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_enable(struct fsl_mc_io *mc_io,
+		 u32 cmd_flags,
+		 u16 token)
+{
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_ENABLE, cmd_flags,
+					  token);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_disable() - Disable the DPRTC.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_disable(struct fsl_mc_io *mc_io,
+		  u32 cmd_flags,
+		  u16 token)
+{
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_DISABLE,
+					  cmd_flags,
+					  token);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_is_enabled() - Check if the DPRTC is enabled.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @en:		Returns '1' if object is enabled; '0' otherwise
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_is_enabled(struct fsl_mc_io *mc_io,
+		     u32 cmd_flags,
+		     u16 token,
+		     int *en)
+{
+	struct dprtc_rsp_is_enabled *rsp_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_IS_ENABLED, cmd_flags,
+					  token);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_rsp_is_enabled *)cmd.params;
+	*en = dprtc_get_field(rsp_params->en, ENABLE);
+
+	return 0;
+}
+
+/**
+ * dprtc_reset() - Reset the DPRTC, returns the object to initial state.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_reset(struct fsl_mc_io *mc_io,
+		u32 cmd_flags,
+		u16 token)
+{
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_RESET,
+					  cmd_flags,
+					  token);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_set_irq_enable() - Set overall interrupt state.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @irq_index:	The interrupt index to configure
+ * @en:		Interrupt state - enable = 1, disable = 0
+ *
+ * Allows GPP software to control when interrupts are generated.
+ * Each interrupt can have up to 32 causes.  The enable/disable control's the
+ * overall interrupt state. if the interrupt is disabled no causes will cause
+ * an interrupt.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_set_irq_enable(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u8 irq_index,
+			 u8 en)
+{
+	struct dprtc_cmd_set_irq_enable *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_SET_IRQ_ENABLE,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_cmd_set_irq_enable *)cmd.params;
+	cmd_params->irq_index = irq_index;
+	cmd_params->en = en;
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_get_irq_enable() - Get overall interrupt state
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @irq_index:	The interrupt index to configure
+ * @en:		Returned interrupt state - enable = 1, disable = 0
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_get_irq_enable(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u8 irq_index,
+			 u8 *en)
+{
+	struct dprtc_rsp_get_irq_enable *rsp_params;
+	struct dprtc_cmd_get_irq *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_GET_IRQ_ENABLE,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_cmd_get_irq *)cmd.params;
+	cmd_params->irq_index = irq_index;
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_rsp_get_irq_enable *)cmd.params;
+	*en = rsp_params->en;
+
+	return 0;
+}
+
+/**
+ * dprtc_set_irq_mask() - Set interrupt mask.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @irq_index:	The interrupt index to configure
+ * @mask:	Event mask to trigger interrupt;
+ *		each bit:
+ *			0 = ignore event
+ *			1 = consider event for asserting IRQ
+ *
+ * Every interrupt can have up to 32 causes and the interrupt model supports
+ * masking/unmasking each cause independently
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_set_irq_mask(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       u8 irq_index,
+		       u32 mask)
+{
+	struct dprtc_cmd_set_irq_mask *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_SET_IRQ_MASK,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_cmd_set_irq_mask *)cmd.params;
+	cmd_params->mask = cpu_to_le32(mask);
+	cmd_params->irq_index = irq_index;
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_get_irq_mask() - Get interrupt mask.
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @irq_index:	The interrupt index to configure
+ * @mask:	Returned event mask to trigger interrupt
+ *
+ * Every interrupt can have up to 32 causes and the interrupt model supports
+ * masking/unmasking each cause independently
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_get_irq_mask(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       u8 irq_index,
+		       u32 *mask)
+{
+	struct dprtc_rsp_get_irq_mask *rsp_params;
+	struct dprtc_cmd_get_irq *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_GET_IRQ_MASK,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_cmd_get_irq *)cmd.params;
+	cmd_params->irq_index = irq_index;
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_rsp_get_irq_mask *)cmd.params;
+	*mask = le32_to_cpu(rsp_params->mask);
+
+	return 0;
+}
+
+/**
+ * dprtc_get_irq_status() - Get the current status of any pending interrupts.
+ *
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @irq_index:	The interrupt index to configure
+ * @status:	Returned interrupts status - one bit per cause:
+ *			0 = no interrupt pending
+ *			1 = interrupt pending
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_get_irq_status(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u8 irq_index,
+			 u32 *status)
+{
+	struct dprtc_cmd_get_irq_status *cmd_params;
+	struct dprtc_rsp_get_irq_status *rsp_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_GET_IRQ_STATUS,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_cmd_get_irq_status *)cmd.params;
+	cmd_params->status = cpu_to_le32(*status);
+	cmd_params->irq_index = irq_index;
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_rsp_get_irq_status *)cmd.params;
+	*status = le32_to_cpu(rsp_params->status);
+
+	return 0;
+}
+
+/**
+ * dprtc_clear_irq_status() - Clear a pending interrupt's status
+ *
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @irq_index:	The interrupt index to configure
+ * @status:	Bits to clear (W1C) - one bit per cause:
+ *			0 = don't change
+ *			1 = clear status bit
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_clear_irq_status(struct fsl_mc_io *mc_io,
+			   u32 cmd_flags,
+			   u16 token,
+			   u8 irq_index,
+			   u32 status)
+{
+	struct dprtc_cmd_clear_irq_status *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_CLEAR_IRQ_STATUS,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_cmd_clear_irq_status *)cmd.params;
+	cmd_params->irq_index = irq_index;
+	cmd_params->status = cpu_to_le32(status);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_get_attributes - Retrieve DPRTC attributes.
+ *
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @attr:	Returned object's attributes
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_get_attributes(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 struct dprtc_attr *attr)
+{
+	struct dprtc_rsp_get_attributes *rsp_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_GET_ATTR,
+					  cmd_flags,
+					  token);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_rsp_get_attributes *)cmd.params;
+	attr->id = le32_to_cpu(rsp_params->id);
+
+	return 0;
+}
+
+/**
+ * dprtc_set_clock_offset() - Sets the clock's offset
+ * (usually relative to another clock).
+ *
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @offset:	New clock offset (in nanoseconds).
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_set_clock_offset(struct fsl_mc_io *mc_io,
+			   u32 cmd_flags,
+			   u16 token,
+			   int64_t offset)
+{
+	struct dprtc_cmd_set_clock_offset *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_SET_CLOCK_OFFSET,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_cmd_set_clock_offset *)cmd.params;
+	cmd_params->offset = cpu_to_le64(offset);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_set_freq_compensation() - Sets a new frequency compensation value.
+ *
+ * @mc_io:		Pointer to MC portal's I/O object
+ * @cmd_flags:		Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:		Token of DPRTC object
+ * @freq_compensation:	The new frequency compensation value to set.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_set_freq_compensation(struct fsl_mc_io *mc_io,
+				u32 cmd_flags,
+				u16 token,
+				u32 freq_compensation)
+{
+	struct dprtc_get_freq_compensation *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_SET_FREQ_COMPENSATION,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_get_freq_compensation *)cmd.params;
+	cmd_params->freq_compensation = cpu_to_le32(freq_compensation);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_get_freq_compensation() - Retrieves the frequency compensation value
+ *
+ * @mc_io:		Pointer to MC portal's I/O object
+ * @cmd_flags:		Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:		Token of DPRTC object
+ * @freq_compensation:	Frequency compensation value
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_get_freq_compensation(struct fsl_mc_io *mc_io,
+				u32 cmd_flags,
+				u16 token,
+				u32 *freq_compensation)
+{
+	struct dprtc_get_freq_compensation *rsp_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_GET_FREQ_COMPENSATION,
+					  cmd_flags,
+					  token);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_get_freq_compensation *)cmd.params;
+	*freq_compensation = le32_to_cpu(rsp_params->freq_compensation);
+
+	return 0;
+}
+
+/**
+ * dprtc_get_time() - Returns the current RTC time.
+ *
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @time:	Current RTC time.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_get_time(struct fsl_mc_io *mc_io,
+		   u32 cmd_flags,
+		   u16 token,
+		   uint64_t *time)
+{
+	struct dprtc_time *rsp_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_GET_TIME,
+					  cmd_flags,
+					  token);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_time *)cmd.params;
+	*time = le64_to_cpu(rsp_params->time);
+
+	return 0;
+}
+
+/**
+ * dprtc_set_time() - Updates current RTC time.
+ *
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @time:	New RTC time.
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_set_time(struct fsl_mc_io *mc_io,
+		   u32 cmd_flags,
+		   u16 token,
+		   uint64_t time)
+{
+	struct dprtc_time *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_SET_TIME,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_time *)cmd.params;
+	cmd_params->time = cpu_to_le64(time);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_set_alarm() - Defines and sets alarm.
+ *
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @token:	Token of DPRTC object
+ * @time:	In nanoseconds, the time when the alarm
+ *			should go off - must be a multiple of
+ *			1 microsecond
+ *
+ * Return:	'0' on Success; Error code otherwise.
+ */
+int dprtc_set_alarm(struct fsl_mc_io *mc_io,
+		    u32 cmd_flags,
+		    u16 token, uint64_t time)
+{
+	struct dprtc_time *cmd_params;
+	struct fsl_mc_command cmd = { 0 };
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_SET_ALARM,
+					  cmd_flags,
+					  token);
+	cmd_params = (struct dprtc_time *)cmd.params;
+	cmd_params->time = cpu_to_le64(time);
+
+	return mc_send_command(mc_io, &cmd);
+}
+
+/**
+ * dprtc_get_api_version() - Get Data Path Real Time Counter API version
+ * @mc_io:	Pointer to MC portal's I/O object
+ * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
+ * @major_ver:	Major version of data path real time counter API
+ * @minor_ver:	Minor version of data path real time counter API
+ *
+ * Return:  '0' on Success; Error code otherwise.
+ */
+int dprtc_get_api_version(struct fsl_mc_io *mc_io,
+			  u32 cmd_flags,
+			  u16 *major_ver,
+			  u16 *minor_ver)
+{
+	struct dprtc_rsp_get_api_version *rsp_params;
+	struct fsl_mc_command cmd = { 0 };
+	int err;
+
+	cmd.header = mc_encode_cmd_header(DPRTC_CMDID_GET_API_VERSION,
+					  cmd_flags,
+					  0);
+
+	err = mc_send_command(mc_io, &cmd);
+	if (err)
+		return err;
+
+	rsp_params = (struct dprtc_rsp_get_api_version *)cmd.params;
+	*major_ver = le16_to_cpu(rsp_params->major);
+	*minor_ver = le16_to_cpu(rsp_params->minor);
+
+	return 0;
+}

drivers/staging/fsl-dpaa2/rtc/dprtc.h

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2016-2018 NXP
+ */
+
+#ifndef __FSL_DPRTC_H
+#define __FSL_DPRTC_H
+
+/* Data Path Real Time Counter API
+ * Contains initialization APIs and runtime control APIs for RTC
+ */
+
+struct fsl_mc_io;
+
+/**
+ * Number of irq's
+ */
+#define DPRTC_MAX_IRQ_NUM			1
+#define DPRTC_IRQ_INDEX				0
+
+/**
+ * Interrupt event masks:
+ */
+
+/**
+ * Interrupt event mask indicating alarm event had occurred
+ */
+#define DPRTC_EVENT_ALARM			0x40000000
+/**
+ * Interrupt event mask indicating periodic pulse event had occurred
+ */
+#define DPRTC_EVENT_PPS				0x08000000
+
+int dprtc_open(struct fsl_mc_io *mc_io,
+	       u32 cmd_flags,
+	       int dprtc_id,
+	       u16 *token);
+
+int dprtc_close(struct fsl_mc_io *mc_io,
+		u32 cmd_flags,
+		u16 token);
+
+/**
+ * struct dprtc_cfg - Structure representing DPRTC configuration
+ * @options:	place holder
+ */
+struct dprtc_cfg {
+	u32 options;
+};
+
+int dprtc_create(struct fsl_mc_io *mc_io,
+		 u16 dprc_token,
+		 u32 cmd_flags,
+		 const struct dprtc_cfg *cfg,
+		 u32 *obj_id);
+
+int dprtc_destroy(struct fsl_mc_io *mc_io,
+		  u16 dprc_token,
+		  u32 cmd_flags,
+		  u32 object_id);
+
+int dprtc_enable(struct fsl_mc_io *mc_io,
+		 u32 cmd_flags,
+		 u16 token);
+
+int dprtc_disable(struct fsl_mc_io *mc_io,
+		  u32 cmd_flags,
+		  u16 token);
+
+int dprtc_is_enabled(struct fsl_mc_io *mc_io,
+		     u32 cmd_flags,
+		     u16 token,
+		     int *en);
+
+int dprtc_reset(struct fsl_mc_io *mc_io,
+		u32 cmd_flags,
+		u16 token);
+
+int dprtc_set_clock_offset(struct fsl_mc_io *mc_io,
+			   u32 cmd_flags,
+			   u16 token,
+			   int64_t offset);
+
+int dprtc_set_freq_compensation(struct fsl_mc_io *mc_io,
+				u32 cmd_flags,
+				u16 token,
+				u32 freq_compensation);
+
+int dprtc_get_freq_compensation(struct fsl_mc_io *mc_io,
+				u32 cmd_flags,
+				u16 token,
+				u32 *freq_compensation);
+
+int dprtc_get_time(struct fsl_mc_io *mc_io,
+		   u32 cmd_flags,
+		   u16 token,
+		   uint64_t *time);
+
+int dprtc_set_time(struct fsl_mc_io *mc_io,
+		   u32 cmd_flags,
+		   u16 token,
+		   uint64_t time);
+
+int dprtc_set_alarm(struct fsl_mc_io *mc_io,
+		    u32 cmd_flags,
+		    u16 token,
+		    uint64_t time);
+
+int dprtc_set_irq_enable(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u8 irq_index,
+			 u8 en);
+
+int dprtc_get_irq_enable(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u8 irq_index,
+			 u8 *en);
+
+int dprtc_set_irq_mask(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       u8 irq_index,
+		       u32 mask);
+
+int dprtc_get_irq_mask(struct fsl_mc_io *mc_io,
+		       u32 cmd_flags,
+		       u16 token,
+		       u8 irq_index,
+		       u32 *mask);
+
+int dprtc_get_irq_status(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 u8 irq_index,
+			 u32 *status);
+
+int dprtc_clear_irq_status(struct fsl_mc_io *mc_io,
+			   u32 cmd_flags,
+			   u16 token,
+			   u8 irq_index,
+			   u32 status);
+
+/**
+ * struct dprtc_attr - Structure representing DPRTC attributes
+ * @id:		DPRTC object ID
+ */
+struct dprtc_attr {
+	int id;
+};
+
+int dprtc_get_attributes(struct fsl_mc_io *mc_io,
+			 u32 cmd_flags,
+			 u16 token,
+			 struct dprtc_attr *attr);
+
+int dprtc_get_api_version(struct fsl_mc_io *mc_io,
+			  u32 cmd_flags,
+			  u16 *major_ver,
+			  u16 *minor_ver);
+
+#endif /* __FSL_DPRTC_H */

drivers/staging/fsl-dpaa2/rtc/rtc.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2013-2016 Freescale Semiconductor Inc.
+ * Copyright 2016-2018 NXP
+ */
+
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/ptp_clock_kernel.h>
+#include <linux/fsl/mc.h>
+
+#include "dprtc.h"
+#include "dprtc-cmd.h"
+
+struct ptp_dpaa2_priv {
+	struct fsl_mc_device *rtc_mc_dev;
+	struct ptp_clock *clock;
+	struct ptp_clock_info caps;
+	int phc_index;
+	u32 freq_comp;
+};
+
+/* PTP clock operations */
+static int ptp_dpaa2_adjfreq(struct ptp_clock_info *ptp, s32 ppb)
+{
+	struct ptp_dpaa2_priv *ptp_dpaa2 =
+		container_of(ptp, struct ptp_dpaa2_priv, caps);
+	struct fsl_mc_device *mc_dev = ptp_dpaa2->rtc_mc_dev;
+	struct device *dev = &mc_dev->dev;
+	u64 adj;
+	u32 diff, tmr_add;
+	int neg_adj = 0;
+	int err = 0;
+
+	if (ppb < 0) {
+		neg_adj = 1;
+		ppb = -ppb;
+	}
+
+	tmr_add = ptp_dpaa2->freq_comp;
+	adj = tmr_add;
+	adj *= ppb;
+	diff = div_u64(adj, 1000000000ULL);
+
+	tmr_add = neg_adj ? tmr_add - diff : tmr_add + diff;
+
+	err = dprtc_set_freq_compensation(mc_dev->mc_io, 0,
+					  mc_dev->mc_handle, tmr_add);
+	if (err)
+		dev_err(dev, "dprtc_set_freq_compensation err %d\n", err);
+	return 0;
+}
+
+static int ptp_dpaa2_adjtime(struct ptp_clock_info *ptp, s64 delta)
+{
+	struct ptp_dpaa2_priv *ptp_dpaa2 =
+		container_of(ptp, struct ptp_dpaa2_priv, caps);
+	struct fsl_mc_device *mc_dev = ptp_dpaa2->rtc_mc_dev;
+	struct device *dev = &mc_dev->dev;
+	s64 now;
+	int err = 0;
+
+	err = dprtc_get_time(mc_dev->mc_io, 0, mc_dev->mc_handle, &now);
+	if (err) {
+		dev_err(dev, "dprtc_get_time err %d\n", err);
+		return 0;
+	}
+
+	now += delta;
+
+	err = dprtc_set_time(mc_dev->mc_io, 0, mc_dev->mc_handle, now);
+	if (err) {
+		dev_err(dev, "dprtc_set_time err %d\n", err);
+		return 0;
+	}
+	return 0;
+}
+
+static int ptp_dpaa2_gettime(struct ptp_clock_info *ptp, struct timespec64 *ts)
+{
+	struct ptp_dpaa2_priv *ptp_dpaa2 =
+		container_of(ptp, struct ptp_dpaa2_priv, caps);
+	struct fsl_mc_device *mc_dev = ptp_dpaa2->rtc_mc_dev;
+	struct device *dev = &mc_dev->dev;
+	u64 ns;
+	u32 remainder;
+	int err = 0;
+
+	err = dprtc_get_time(mc_dev->mc_io, 0, mc_dev->mc_handle, &ns);
+	if (err) {
+		dev_err(dev, "dprtc_get_time err %d\n", err);
+		return 0;
+	}
+
+	ts->tv_sec = div_u64_rem(ns, 1000000000, &remainder);
+	ts->tv_nsec = remainder;
+	return 0;
+}
+
+static int ptp_dpaa2_settime(struct ptp_clock_info *ptp,
+			     const struct timespec64 *ts)
+{
+	struct ptp_dpaa2_priv *ptp_dpaa2 =
+		container_of(ptp, struct ptp_dpaa2_priv, caps);
+	struct fsl_mc_device *mc_dev = ptp_dpaa2->rtc_mc_dev;
+	struct device *dev = &mc_dev->dev;
+	u64 ns;
+	int err = 0;
+
+	ns = ts->tv_sec * 1000000000ULL;
+	ns += ts->tv_nsec;
+
+	err = dprtc_set_time(mc_dev->mc_io, 0, mc_dev->mc_handle, ns);
+	if (err)
+		dev_err(dev, "dprtc_set_time err %d\n", err);
+	return 0;
+}
+
+static struct ptp_clock_info ptp_dpaa2_caps = {
+	.owner		= THIS_MODULE,
+	.name		= "DPAA2 PTP Clock",
+	.max_adj	= 512000,
+	.n_alarm	= 2,
+	.n_ext_ts	= 2,
+	.n_per_out	= 3,
+	.n_pins		= 0,
+	.pps		= 1,
+	.adjfreq	= ptp_dpaa2_adjfreq,
+	.adjtime	= ptp_dpaa2_adjtime,
+	.gettime64	= ptp_dpaa2_gettime,
+	.settime64	= ptp_dpaa2_settime,
+};
+
+static int rtc_probe(struct fsl_mc_device *mc_dev)
+{
+	struct device *dev = &mc_dev->dev;
+	struct ptp_dpaa2_priv *ptp_dpaa2;
+	u32 tmr_add = 0;
+	int err;
+
+	ptp_dpaa2 = kzalloc(sizeof(*ptp_dpaa2), GFP_KERNEL);
+	if (!ptp_dpaa2)
+		return -ENOMEM;
+
+	err = fsl_mc_portal_allocate(mc_dev, 0, &mc_dev->mc_io);
+	if (err) {
+		dev_err(dev, "fsl_mc_portal_allocate err %d\n", err);
+		goto err_exit;
+	}
+
+	err = dprtc_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id,
+			 &mc_dev->mc_handle);
+	if (err) {
+		dev_err(dev, "dprtc_open err %d\n", err);
+		goto err_free_mcp;
+	}
+
+	ptp_dpaa2->rtc_mc_dev = mc_dev;
+
+	err = dprtc_get_freq_compensation(mc_dev->mc_io, 0,
+					  mc_dev->mc_handle, &tmr_add);
+	if (err) {
+		dev_err(dev, "dprtc_get_freq_compensation err %d\n", err);
+		goto err_close;
+	}
+
+	ptp_dpaa2->freq_comp = tmr_add;
+	ptp_dpaa2->caps = ptp_dpaa2_caps;
+
+	ptp_dpaa2->clock = ptp_clock_register(&ptp_dpaa2->caps, dev);
+	if (IS_ERR(ptp_dpaa2->clock)) {
+		err = PTR_ERR(ptp_dpaa2->clock);
+		goto err_close;
+	}
+
+	ptp_dpaa2->phc_index = ptp_clock_index(ptp_dpaa2->clock);
+
+	dev_set_drvdata(dev, ptp_dpaa2);
+
+	return 0;
+
+err_close:
+	dprtc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+err_free_mcp:
+	fsl_mc_portal_free(mc_dev->mc_io);
+err_exit:
+	kfree(ptp_dpaa2);
+	dev_set_drvdata(dev, NULL);
+	return err;
+}
+
+static int rtc_remove(struct fsl_mc_device *mc_dev)
+{
+	struct ptp_dpaa2_priv *ptp_dpaa2;
+	struct device *dev = &mc_dev->dev;
+
+	ptp_dpaa2 = dev_get_drvdata(dev);
+	ptp_clock_unregister(ptp_dpaa2->clock);
+
+	dprtc_close(mc_dev->mc_io, 0, mc_dev->mc_handle);
+	fsl_mc_portal_free(mc_dev->mc_io);
+
+	kfree(ptp_dpaa2);
+	dev_set_drvdata(dev, NULL);
+
+	return 0;
+}
+
+static const struct fsl_mc_device_id rtc_match_id_table[] = {
+	{
+		.vendor = FSL_MC_VENDOR_FREESCALE,
+		.obj_type = "dprtc",
+	},
+	{}
+};
+MODULE_DEVICE_TABLE(fslmc, rtc_match_id_table);
+
+static struct fsl_mc_driver rtc_drv = {
+	.driver = {
+		.name = KBUILD_MODNAME,
+		.owner = THIS_MODULE,
+	},
+	.probe = rtc_probe,
+	.remove = rtc_remove,
+	.match_id_table = rtc_match_id_table,
+};
+
+module_fsl_mc_driver(rtc_drv);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DPAA2 PTP Clock Driver");