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