drivers/bus/fsl-mc/dprc.c

Source file repositories/reference/linux-study-clean/drivers/bus/fsl-mc/dprc.c

File Facts

System
Linux kernel
Corpus path
drivers/bus/fsl-mc/dprc.c
Extension
.c
Size
20913 bytes
Lines
701
Domain
Driver Families
Bucket
drivers/bus
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
/*
 * Copyright 2013-2016 Freescale Semiconductor Inc.
 * Copyright 2020 NXP
 *
 */
#include <linux/kernel.h>
#include <linux/fsl/mc.h>

#include "fsl-mc-private.h"

/*
 * cache the DPRC version to reduce the number of commands
 * towards the mc firmware
 */
static u16 dprc_major_ver;
static u16 dprc_minor_ver;

/**
 * dprc_open() - Open DPRC object for use
 * @mc_io:	Pointer to MC portal's I/O object
 * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
 * @container_id: Container ID to open
 * @token:	Returned token of DPRC object
 *
 * Return:	'0' on Success; Error code otherwise.
 *
 * @warning	Required before any operation on the object.
 */
int dprc_open(struct fsl_mc_io *mc_io,
	      u32 cmd_flags,
	      int container_id,
	      u16 *token)
{
	struct fsl_mc_command cmd = { 0 };
	struct dprc_cmd_open *cmd_params;
	int err;

	/* prepare command */
	cmd.header = mc_encode_cmd_header(DPRC_CMDID_OPEN, cmd_flags,
					  0);
	cmd_params = (struct dprc_cmd_open *)cmd.params;
	cmd_params->container_id = cpu_to_le32(container_id);

	/* send command to mc*/
	err = mc_send_command(mc_io, &cmd);
	if (err)
		return err;

	/* retrieve response parameters */
	*token = mc_cmd_hdr_read_token(&cmd);

	return 0;
}
EXPORT_SYMBOL_GPL(dprc_open);

/**
 * dprc_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 DPRC 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 dprc_close(struct fsl_mc_io *mc_io,
	       u32 cmd_flags,
	       u16 token)
{
	struct fsl_mc_command cmd = { 0 };

	/* prepare command */
	cmd.header = mc_encode_cmd_header(DPRC_CMDID_CLOSE, cmd_flags,
					  token);

	/* send command to mc*/
	return mc_send_command(mc_io, &cmd);
}
EXPORT_SYMBOL_GPL(dprc_close);

/**
 * dprc_reset_container - Reset child container.
 * @mc_io:	Pointer to MC portal's I/O object
 * @cmd_flags:	Command flags; one or more of 'MC_CMD_FLAG_'
 * @token:	Token of DPRC object
 * @child_container_id:	ID of the container to reset
 * @options: 32 bit options:
 *   - 0 (no bits set) - all the objects inside the container are

Annotation

Implementation Notes