| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Intel SST generic IPC Support |
| 3 | * |
| 4 | * Copyright (C) 2015, Intel Corporation. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License version |
| 8 | * 2 as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | */ |
| 16 | |
| 17 | #ifndef __SST_GENERIC_IPC_H |
| 18 | #define __SST_GENERIC_IPC_H |
| 19 | |
| 20 | #include <linux/types.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/wait.h> |
| 23 | #include <linux/list.h> |
| 24 | #include <linux/workqueue.h> |
| 25 | #include <linux/sched.h> |
| 26 | |
| 27 | #define IPC_MAX_MAILBOX_BYTES 256 |
| 28 | |
| 29 | struct ipc_message { |
| 30 | struct list_head list; |
| 31 | u64 header; |
| 32 | |
| 33 | /* direction wrt host CPU */ |
| 34 | char *tx_data; |
| 35 | size_t tx_size; |
| 36 | char *rx_data; |
| 37 | size_t rx_size; |
| 38 | |
| 39 | wait_queue_head_t waitq; |
| 40 | bool pending; |
| 41 | bool complete; |
| 42 | bool wait; |
| 43 | int errno; |
| 44 | }; |
| 45 | |
| 46 | struct sst_generic_ipc; |
| 47 | |
| 48 | struct sst_plat_ipc_ops { |
| 49 | void (*tx_msg)(struct sst_generic_ipc *, struct ipc_message *); |
| 50 | void (*shim_dbg)(struct sst_generic_ipc *, const char *); |
| 51 | void (*tx_data_copy)(struct ipc_message *, char *, size_t); |
| 52 | u64 (*reply_msg_match)(u64 header, u64 *mask); |
| 53 | bool (*is_dsp_busy)(struct sst_dsp *dsp); |
| 54 | int (*check_dsp_lp_on)(struct sst_dsp *dsp, bool state); |
| 55 | }; |
| 56 | |
| 57 | /* SST generic IPC data */ |
| 58 | struct sst_generic_ipc { |
| 59 | struct device *dev; |
| 60 | struct sst_dsp *dsp; |
| 61 | |
| 62 | /* IPC messaging */ |
| 63 | struct list_head tx_list; |
| 64 | struct list_head rx_list; |
| 65 | struct list_head empty_list; |
| 66 | wait_queue_head_t wait_txq; |
| 67 | struct task_struct *tx_thread; |
| 68 | struct work_struct kwork; |
| 69 | bool pending; |
| 70 | struct ipc_message *msg; |
| 71 | int tx_data_max_size; |
| 72 | int rx_data_max_size; |
| 73 | |
| 74 | struct sst_plat_ipc_ops ops; |
| 75 | }; |
| 76 | |
| 77 | int sst_ipc_tx_message_wait(struct sst_generic_ipc *ipc, u64 header, |
| 78 | void *tx_data, size_t tx_bytes, void *rx_data, size_t rx_bytes); |
| 79 | |
| 80 | int sst_ipc_tx_message_nowait(struct sst_generic_ipc *ipc, u64 header, |
| 81 | void *tx_data, size_t tx_bytes); |
| 82 | |
| 83 | int sst_ipc_tx_message_nopm(struct sst_generic_ipc *ipc, u64 header, |
| 84 | void *tx_data, size_t tx_bytes, void *rx_data, size_t rx_bytes); |
| 85 | |
| 86 | struct ipc_message *sst_ipc_reply_find_msg(struct sst_generic_ipc *ipc, |
| 87 | u64 header); |
| 88 | |
| 89 | void sst_ipc_tx_msg_reply_complete(struct sst_generic_ipc *ipc, |
| 90 | struct ipc_message *msg); |
| 91 | |
| 92 | void sst_ipc_drop_all(struct sst_generic_ipc *ipc); |
| 93 | int sst_ipc_init(struct sst_generic_ipc *ipc); |
| 94 | void sst_ipc_fini(struct sst_generic_ipc *ipc); |
| 95 | |
| 96 | #endif |