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kernel add
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/*
* Intel SST generic IPC Support
*
* Copyright (C) 2015, Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __SST_GENERIC_IPC_H
#define __SST_GENERIC_IPC_H
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/wait.h>
#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/sched.h>
#include <linux/kthread.h>
#define IPC_MAX_MAILBOX_BYTES 256
struct ipc_message {
struct list_head list;
u64 header;
/* direction wrt host CPU */
char *tx_data;
size_t tx_size;
char *rx_data;
size_t rx_size;
wait_queue_head_t waitq;
bool pending;
bool complete;
bool wait;
int errno;
};
struct sst_generic_ipc;
struct sst_plat_ipc_ops {
void (*tx_msg)(struct sst_generic_ipc *, struct ipc_message *);
void (*shim_dbg)(struct sst_generic_ipc *, const char *);
void (*tx_data_copy)(struct ipc_message *, char *, size_t);
u64 (*reply_msg_match)(u64 header, u64 *mask);
bool (*is_dsp_busy)(struct sst_dsp *dsp);
};
/* SST generic IPC data */
struct sst_generic_ipc {
struct device *dev;
struct sst_dsp *dsp;
/* IPC messaging */
struct list_head tx_list;
struct list_head rx_list;
struct list_head empty_list;
wait_queue_head_t wait_txq;
struct task_struct *tx_thread;
struct kthread_worker kworker;
struct kthread_work kwork;
bool pending;
struct ipc_message *msg;
int tx_data_max_size;
int rx_data_max_size;
struct sst_plat_ipc_ops ops;
};
int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc, u64 header,
void *tx_data, size_t tx_bytes, void *rx_data, size_t rx_bytes);
int sst_ipc_tx_message_nowait(struct sst_generic_ipc *ipc, u64 header,
void *tx_data, size_t tx_bytes);
struct ipc_message *sst_ipc_reply_find_msg(struct sst_generic_ipc *ipc,
u64 header);
void sst_ipc_tx_msg_reply_complete(struct sst_generic_ipc *ipc,
struct ipc_message *msg);
void sst_ipc_drop_all(struct sst_generic_ipc *ipc);
int sst_ipc_init(struct sst_generic_ipc *ipc);
void sst_ipc_fini(struct sst_generic_ipc *ipc);
#endif
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