diff options
Diffstat (limited to 'drivers/hid/intel-ish-hid/ishtp/client.h')
| -rw-r--r-- | drivers/hid/intel-ish-hid/ishtp/client.h | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/hid/intel-ish-hid/ishtp/client.h b/drivers/hid/intel-ish-hid/ishtp/client.h new file mode 100644 index 000000000..79eade547 --- /dev/null +++ b/drivers/hid/intel-ish-hid/ishtp/client.h @@ -0,0 +1,182 @@ +/* + * ISHTP client logic + * + * Copyright (c) 2003-2016, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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 _ISHTP_CLIENT_H_ +#define _ISHTP_CLIENT_H_ + +#include <linux/types.h> +#include "ishtp-dev.h" + +/* Client state */ +enum cl_state { + ISHTP_CL_INITIALIZING = 0, + ISHTP_CL_CONNECTING, + ISHTP_CL_CONNECTED, + ISHTP_CL_DISCONNECTING, + ISHTP_CL_DISCONNECTED +}; + +/* Tx and Rx ring size */ +#define CL_DEF_RX_RING_SIZE 2 +#define CL_DEF_TX_RING_SIZE 2 +#define CL_MAX_RX_RING_SIZE 32 +#define CL_MAX_TX_RING_SIZE 32 + +#define DMA_SLOT_SIZE 4096 +/* Number of IPC fragments after which it's worth sending via DMA */ +#define DMA_WORTH_THRESHOLD 3 + +/* DMA/IPC Tx paths. Other the default means enforcement */ +#define CL_TX_PATH_DEFAULT 0 +#define CL_TX_PATH_IPC 1 +#define CL_TX_PATH_DMA 2 + +/* Client Tx buffer list entry */ +struct ishtp_cl_tx_ring { + struct list_head list; + struct ishtp_msg_data send_buf; +}; + +/* ISHTP client instance */ +struct ishtp_cl { + struct list_head link; + struct ishtp_device *dev; + enum cl_state state; + int status; + + /* Link to ISHTP bus device */ + struct ishtp_cl_device *device; + + /* ID of client connected */ + uint8_t host_client_id; + uint8_t fw_client_id; + uint8_t ishtp_flow_ctrl_creds; + uint8_t out_flow_ctrl_creds; + + /* dma */ + int last_tx_path; + /* 0: ack wasn't received,1:ack was received */ + int last_dma_acked; + unsigned char *last_dma_addr; + /* 0: ack wasn't received,1:ack was received */ + int last_ipc_acked; + + /* Rx ring buffer pool */ + unsigned int rx_ring_size; + struct ishtp_cl_rb free_rb_list; + spinlock_t free_list_spinlock; + /* Rx in-process list */ + struct ishtp_cl_rb in_process_list; + spinlock_t in_process_spinlock; + + /* Client Tx buffers list */ + unsigned int tx_ring_size; + struct ishtp_cl_tx_ring tx_list, tx_free_list; + spinlock_t tx_list_spinlock; + spinlock_t tx_free_list_spinlock; + size_t tx_offs; /* Offset in buffer at head of 'tx_list' */ + + /** + * if we get a FC, and the list is not empty, we must know whether we + * are at the middle of sending. + * if so -need to increase FC counter, otherwise, need to start sending + * the first msg in list + * (!)This is for counting-FC implementation only. Within single-FC the + * other party may NOT send FC until it receives complete message + */ + int sending; + + /* Send FC spinlock */ + spinlock_t fc_spinlock; + + /* wait queue for connect and disconnect response from FW */ + wait_queue_head_t wait_ctrl_res; + + /* Error stats */ + unsigned int err_send_msg; + unsigned int err_send_fc; + + /* Send/recv stats */ + unsigned int send_msg_cnt_ipc; + unsigned int send_msg_cnt_dma; + unsigned int recv_msg_cnt_ipc; + unsigned int recv_msg_cnt_dma; + unsigned int recv_msg_num_frags; + unsigned int ishtp_flow_ctrl_cnt; + unsigned int out_flow_ctrl_cnt; + + /* Rx msg ... out FC timing */ + ktime_t ts_rx; + ktime_t ts_out_fc; + ktime_t ts_max_fc_delay; + void *client_data; +}; + +/* Client connection managenment internal functions */ +int ishtp_can_client_connect(struct ishtp_device *ishtp_dev, uuid_le *uuid); +int ishtp_fw_cl_by_id(struct ishtp_device *dev, uint8_t client_id); +void ishtp_cl_send_msg(struct ishtp_device *dev, struct ishtp_cl *cl); +void recv_ishtp_cl_msg(struct ishtp_device *dev, + struct ishtp_msg_hdr *ishtp_hdr); +int ishtp_cl_read_start(struct ishtp_cl *cl); + +/* Ring Buffer I/F */ +int ishtp_cl_alloc_rx_ring(struct ishtp_cl *cl); +int ishtp_cl_alloc_tx_ring(struct ishtp_cl *cl); +void ishtp_cl_free_rx_ring(struct ishtp_cl *cl); +void ishtp_cl_free_tx_ring(struct ishtp_cl *cl); + +/* DMA I/F functions */ +void recv_ishtp_cl_msg_dma(struct ishtp_device *dev, void *msg, + struct dma_xfer_hbm *hbm); +void ishtp_cl_alloc_dma_buf(struct ishtp_device *dev); +void ishtp_cl_free_dma_buf(struct ishtp_device *dev); +void *ishtp_cl_get_dma_send_buf(struct ishtp_device *dev, + uint32_t size); +void ishtp_cl_release_dma_acked_mem(struct ishtp_device *dev, + void *msg_addr, + uint8_t size); + +/* Request blocks alloc/free I/F */ +struct ishtp_cl_rb *ishtp_io_rb_init(struct ishtp_cl *cl); +void ishtp_io_rb_free(struct ishtp_cl_rb *priv_rb); +int ishtp_io_rb_alloc_buf(struct ishtp_cl_rb *rb, size_t length); + +/** + * ishtp_cl_cmp_id - tells if file private data have same id + * returns true - if ids are the same and not NULL + */ +static inline bool ishtp_cl_cmp_id(const struct ishtp_cl *cl1, + const struct ishtp_cl *cl2) +{ + return cl1 && cl2 && + (cl1->host_client_id == cl2->host_client_id) && + (cl1->fw_client_id == cl2->fw_client_id); +} + +/* exported functions from ISHTP under client management scope */ +struct ishtp_cl *ishtp_cl_allocate(struct ishtp_device *dev); +void ishtp_cl_free(struct ishtp_cl *cl); +int ishtp_cl_link(struct ishtp_cl *cl, int id); +void ishtp_cl_unlink(struct ishtp_cl *cl); +int ishtp_cl_disconnect(struct ishtp_cl *cl); +int ishtp_cl_connect(struct ishtp_cl *cl); +int ishtp_cl_send(struct ishtp_cl *cl, uint8_t *buf, size_t length); +int ishtp_cl_flush_queues(struct ishtp_cl *cl); + +/* exported functions from ISHTP client buffer management scope */ +int ishtp_cl_io_rb_recycle(struct ishtp_cl_rb *rb); + +#endif /* _ISHTP_CLIENT_H_ */ |