linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Texas Instruments System Control Interface Protocol Driver

 *

 * Copyright (C) 2015-2016 Texas Instruments Incorporated - http://www.ti.com/

 *  Nishanth Menon

 */

​

#define pr_fmt(fmt) "%s: " fmt, __func__

​

#include <linux/bitmap.h>

#include <linux/debugfs.h>

#include <linux/export.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/mailbox_client.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/semaphore.h>

#include <linux/slab.h>

#include <linux/soc/ti/ti-msgmgr.h>

#include <linux/soc/ti/ti_sci_protocol.h>

#include <linux/reboot.h>

​

#include "ti_sci.h"

​

/* List of all TI SCI devices active in system */

static LIST_HEAD(ti_sci_list);

/* Protection for the entire list */

static DEFINE_MUTEX(ti_sci_list_mutex);

​

/**

 * struct ti_sci_xfer - Structure representing a message flow

 * @tx_message: Transmit message

 * @rx_len: Receive message length

 * @xfer_buf:   Preallocated buffer to store receive message

 *      Since we work with request-ACK protocol, we can

 *      reuse the same buffer for the rx path as we

 *      use for the tx path.

 * @done:   completion event

 */

struct ti_sci_xfer {

    struct ti_msgmgr_message tx_message;

    u8 rx_len;

    u8 *xfer_buf;

    struct completion done;

};

​

/**

 * struct ti_sci_xfers_info - Structure to manage transfer information

 * @sem_xfer_count: Counting Semaphore for managing max simultaneous

 *          Messages.

 * @xfer_block:     Preallocated Message array

 * @xfer_alloc_table:   Bitmap table for allocated messages.

 *          Index of this bitmap table is also used for message

 *          sequence identifier.

 * @xfer_lock:      Protection for message allocation

 */

struct ti_sci_xfers_info {

    struct semaphore sem_xfer_count;

    struct ti_sci_xfer *xfer_block;

    unsigned long *xfer_alloc_table;

    /* protect transfer allocation */