xref: /openbmc/linux/drivers/net/ethernet/freescale/dpaa2/dprtc.c (revision 0898782247ae533d1f4e47a06bc5d4870931b284)

// 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_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);
}