1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Intel SST generic IPC Support 4 * 5 * Copyright (C) 2015, Intel Corporation. All rights reserved. 6 */ 7 8 #ifndef __SST_GENERIC_IPC_H 9 #define __SST_GENERIC_IPC_H 10 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> 17 18 struct sst_ipc_message { 19 u64 header; 20 void *data; 21 size_t size; 22 }; 23 24 struct ipc_message { 25 struct list_head list; 26 struct sst_ipc_message tx; 27 struct sst_ipc_message rx; 28 29 wait_queue_head_t waitq; 30 bool pending; 31 bool complete; 32 bool wait; 33 int errno; 34 }; 35 36 struct sst_generic_ipc; 37 struct sst_dsp; 38 39 struct sst_plat_ipc_ops { 40 void (*tx_msg)(struct sst_generic_ipc *, struct ipc_message *); 41 void (*shim_dbg)(struct sst_generic_ipc *, const char *); 42 void (*tx_data_copy)(struct ipc_message *, char *, size_t); 43 u64 (*reply_msg_match)(u64 header, u64 *mask); 44 bool (*is_dsp_busy)(struct sst_dsp *dsp); 45 int (*check_dsp_lp_on)(struct sst_dsp *dsp, bool state); 46 }; 47 48 /* SST generic IPC data */ 49 struct sst_generic_ipc { 50 struct device *dev; 51 struct sst_dsp *dsp; 52 53 /* IPC messaging */ 54 struct list_head tx_list; 55 struct list_head rx_list; 56 struct list_head empty_list; 57 wait_queue_head_t wait_txq; 58 struct task_struct *tx_thread; 59 struct work_struct kwork; 60 bool pending; 61 struct ipc_message *msg; 62 int tx_data_max_size; 63 int rx_data_max_size; 64 65 struct sst_plat_ipc_ops ops; 66 }; 67 68 int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc, 69 struct sst_ipc_message request, struct sst_ipc_message *reply); 70 71 int sst_ipc_tx_message_nowait(struct sst_generic_ipc *ipc, 72 struct sst_ipc_message request); 73 74 int sst_ipc_tx_message_nopm(struct sst_generic_ipc *ipc, 75 struct sst_ipc_message request, struct sst_ipc_message *reply); 76 77 struct ipc_message *sst_ipc_reply_find_msg(struct sst_generic_ipc *ipc, 78 u64 header); 79 80 void sst_ipc_tx_msg_reply_complete(struct sst_generic_ipc *ipc, 81 struct ipc_message *msg); 82 83 int sst_ipc_init(struct sst_generic_ipc *ipc); 84 void sst_ipc_fini(struct sst_generic_ipc *ipc); 85 86 #endif 87