1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Intel SST generic IPC Support
5 * Copyright (C) 2015, Intel Corporation. All rights reserved.
8 #ifndef __SST_GENERIC_IPC_H
9 #define __SST_GENERIC_IPC_H
11 #include <linux/types.h>
12 #include <linux/kernel.h>
13 #include <linux/wait.h>
14 #include <linux/list.h>
15 #include <linux/workqueue.h>
16 #include <linux/sched.h>
18 #define IPC_MAX_MAILBOX_BYTES 256
20 struct sst_ipc_message {
27 struct list_head list;
28 struct sst_ipc_message tx;
29 struct sst_ipc_message rx;
31 wait_queue_head_t waitq;
38 struct sst_generic_ipc;
41 struct sst_plat_ipc_ops {
42 void (*tx_msg)(struct sst_generic_ipc *, struct ipc_message *);
43 void (*shim_dbg)(struct sst_generic_ipc *, const char *);
44 void (*tx_data_copy)(struct ipc_message *, char *, size_t);
45 u64 (*reply_msg_match)(u64 header, u64 *mask);
46 bool (*is_dsp_busy)(struct sst_dsp *dsp);
47 int (*check_dsp_lp_on)(struct sst_dsp *dsp, bool state);
50 /* SST generic IPC data */
51 struct sst_generic_ipc {
56 struct list_head tx_list;
57 struct list_head rx_list;
58 struct list_head empty_list;
59 wait_queue_head_t wait_txq;
60 struct task_struct *tx_thread;
61 struct work_struct kwork;
63 struct ipc_message *msg;
67 struct sst_plat_ipc_ops ops;
70 int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc,
71 struct sst_ipc_message request, struct sst_ipc_message *reply);
73 int sst_ipc_tx_message_nowait(struct sst_generic_ipc *ipc,
74 struct sst_ipc_message request);
76 int sst_ipc_tx_message_nopm(struct sst_generic_ipc *ipc,
77 struct sst_ipc_message request, struct sst_ipc_message *reply);
79 struct ipc_message *sst_ipc_reply_find_msg(struct sst_generic_ipc *ipc,
82 void sst_ipc_tx_msg_reply_complete(struct sst_generic_ipc *ipc,
83 struct ipc_message *msg);
85 void sst_ipc_drop_all(struct sst_generic_ipc *ipc);
86 int sst_ipc_init(struct sst_generic_ipc *ipc);
87 void sst_ipc_fini(struct sst_generic_ipc *ipc);