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kernel-ark/drivers/hid/intel-ish-hid/ishtp/hbm.h
Srinivas Pandruvada 3703f53b99 HID: intel_ish-hid: ISH Transport layer 
The ISH transport layer (ishtp) is a bi-directional protocol implemented
on the top of PCI based inter processor communication layer. This layer
offers:
- Connection management
- Flow control with the firmware
- Multiple client sessions
- Client message transfer
- Client message reception
- DMA for RX and TX for fast data transfer

Refer to Documentation/hid/intel-ish-hid.txt for
overview of the functionality implemented in this layer.

Original-author: Daniel Drubin <daniel.drubin@intel.com>
Reviewed-and-tested-by: Ooi, Joyce <joyce.ooi@intel.com>
Tested-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: Rann Bar-On <rb6@duke.edu>
Tested-by: Atri Bhattacharya <badshah400@aim.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2016-08-17 11:13:07 +02:00

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/*
* ISHTP bus layer messages handling
*
* 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_HBM_H_
#define _ISHTP_HBM_H_
#include <linux/uuid.h>
struct ishtp_device;
struct ishtp_msg_hdr;
struct ishtp_cl;
/*
* Timeouts in Seconds
*/
#define ISHTP_INTEROP_TIMEOUT 7 /* Timeout on ready message */
#define ISHTP_CL_CONNECT_TIMEOUT 15 /* HPS: Client Connect Timeout */
/*
* ISHTP Version
*/
#define HBM_MINOR_VERSION 0
#define HBM_MAJOR_VERSION 1
/* Host bus message command opcode */
#define ISHTP_HBM_CMD_OP_MSK 0x7f
/* Host bus message command RESPONSE */
#define ISHTP_HBM_CMD_RES_MSK 0x80
/*
* ISHTP Bus Message Command IDs
*/
#define HOST_START_REQ_CMD 0x01
#define HOST_START_RES_CMD 0x81
#define HOST_STOP_REQ_CMD 0x02
#define HOST_STOP_RES_CMD 0x82
#define FW_STOP_REQ_CMD 0x03
#define HOST_ENUM_REQ_CMD 0x04
#define HOST_ENUM_RES_CMD 0x84
#define HOST_CLIENT_PROPERTIES_REQ_CMD 0x05
#define HOST_CLIENT_PROPERTIES_RES_CMD 0x85
#define CLIENT_CONNECT_REQ_CMD 0x06
#define CLIENT_CONNECT_RES_CMD 0x86
#define CLIENT_DISCONNECT_REQ_CMD 0x07
#define CLIENT_DISCONNECT_RES_CMD 0x87
#define ISHTP_FLOW_CONTROL_CMD 0x08
#define DMA_BUFFER_ALLOC_NOTIFY 0x11
#define DMA_BUFFER_ALLOC_RESPONSE 0x91
#define DMA_XFER 0x12
#define DMA_XFER_ACK 0x92
/*
* ISHTP Stop Reason
* used by hbm_host_stop_request.reason
*/
#define DRIVER_STOP_REQUEST 0x00
/*
* ISHTP BUS Interface Section
*/
struct ishtp_msg_hdr {
uint32_t fw_addr:8;
uint32_t host_addr:8;
uint32_t length:9;
uint32_t reserved:6;
uint32_t msg_complete:1;
} __packed;
struct ishtp_bus_message {
uint8_t hbm_cmd;
uint8_t data[0];
} __packed;
/**
* struct hbm_cl_cmd - client specific host bus command
* CONNECT, DISCONNECT, and FlOW CONTROL
*
* @hbm_cmd - bus message command header
* @fw_addr - address of the fw client
* @host_addr - address of the client in the driver
* @data
*/
struct ishtp_hbm_cl_cmd {
uint8_t hbm_cmd;
uint8_t fw_addr;
uint8_t host_addr;
uint8_t data;
};
struct hbm_version {
uint8_t minor_version;
uint8_t major_version;
} __packed;
struct hbm_host_version_request {
uint8_t hbm_cmd;
uint8_t reserved;
struct hbm_version host_version;
} __packed;
struct hbm_host_version_response {
uint8_t hbm_cmd;
uint8_t host_version_supported;
struct hbm_version fw_max_version;
} __packed;
struct hbm_host_stop_request {
uint8_t hbm_cmd;
uint8_t reason;
uint8_t reserved[2];
} __packed;
struct hbm_host_stop_response {
uint8_t hbm_cmd;
uint8_t reserved[3];
} __packed;
struct hbm_host_enum_request {
uint8_t hbm_cmd;
uint8_t reserved[3];
} __packed;
struct hbm_host_enum_response {
uint8_t hbm_cmd;
uint8_t reserved[3];
uint8_t valid_addresses[32];
} __packed;
struct ishtp_client_properties {
uuid_le protocol_name;
uint8_t protocol_version;
uint8_t max_number_of_connections;
uint8_t fixed_address;
uint8_t single_recv_buf;
uint32_t max_msg_length;
uint8_t dma_hdr_len;
#define ISHTP_CLIENT_DMA_ENABLED 0x80
uint8_t reserved4;
uint8_t reserved5;
uint8_t reserved6;
} __packed;
struct hbm_props_request {
uint8_t hbm_cmd;
uint8_t address;
uint8_t reserved[2];
} __packed;
struct hbm_props_response {
uint8_t hbm_cmd;
uint8_t address;
uint8_t status;
uint8_t reserved[1];
struct ishtp_client_properties client_properties;
} __packed;
/**
* struct hbm_client_connect_request - connect/disconnect request
*
* @hbm_cmd - bus message command header
* @fw_addr - address of the fw client
* @host_addr - address of the client in the driver
* @reserved
*/
struct hbm_client_connect_request {
uint8_t hbm_cmd;
uint8_t fw_addr;
uint8_t host_addr;
uint8_t reserved;
} __packed;
/**
* struct hbm_client_connect_response - connect/disconnect response
*
* @hbm_cmd - bus message command header
* @fw_addr - address of the fw client
* @host_addr - address of the client in the driver
* @status - status of the request
*/
struct hbm_client_connect_response {
uint8_t hbm_cmd;
uint8_t fw_addr;
uint8_t host_addr;
uint8_t status;
} __packed;
#define ISHTP_FC_MESSAGE_RESERVED_LENGTH 5
struct hbm_flow_control {
uint8_t hbm_cmd;
uint8_t fw_addr;
uint8_t host_addr;
uint8_t reserved[ISHTP_FC_MESSAGE_RESERVED_LENGTH];
} __packed;
struct dma_alloc_notify {
uint8_t hbm;
uint8_t status;
uint8_t reserved[2];
uint32_t buf_size;
uint64_t buf_address;
/* [...] May come more size/address pairs */
} __packed;
struct dma_xfer_hbm {
uint8_t hbm;
uint8_t fw_client_id;
uint8_t host_client_id;
uint8_t reserved;
uint64_t msg_addr;
uint32_t msg_length;
uint32_t reserved2;
} __packed;
/* System state */
#define ISHTP_SYSTEM_STATE_CLIENT_ADDR 13
#define SYSTEM_STATE_SUBSCRIBE 0x1
#define SYSTEM_STATE_STATUS 0x2
#define SYSTEM_STATE_QUERY_SUBSCRIBERS 0x3
#define SYSTEM_STATE_STATE_CHANGE_REQ 0x4
/*indicates suspend and resume states*/
#define SUSPEND_STATE_BIT (1<<1)
struct ish_system_states_header {
uint32_t cmd;
uint32_t cmd_status; /*responses will have this set*/
} __packed;
struct ish_system_states_subscribe {
struct ish_system_states_header hdr;
uint32_t states;
} __packed;
struct ish_system_states_status {
struct ish_system_states_header hdr;
uint32_t supported_states;
uint32_t states_status;
} __packed;
struct ish_system_states_query_subscribers {
struct ish_system_states_header hdr;
} __packed;
struct ish_system_states_state_change_req {
struct ish_system_states_header hdr;
uint32_t requested_states;
uint32_t states_status;
} __packed;
/**
* enum ishtp_hbm_state - host bus message protocol state
*
* @ISHTP_HBM_IDLE : protocol not started
* @ISHTP_HBM_START : start request message was sent
* @ISHTP_HBM_ENUM_CLIENTS : enumeration request was sent
* @ISHTP_HBM_CLIENT_PROPERTIES : acquiring clients properties
*/
enum ishtp_hbm_state {
ISHTP_HBM_IDLE = 0,
ISHTP_HBM_START,
ISHTP_HBM_STARTED,
ISHTP_HBM_ENUM_CLIENTS,
ISHTP_HBM_CLIENT_PROPERTIES,
ISHTP_HBM_WORKING,
ISHTP_HBM_STOPPED,
};
static inline void ishtp_hbm_hdr(struct ishtp_msg_hdr *hdr, size_t length)
{
hdr->host_addr = 0;
hdr->fw_addr = 0;
hdr->length = length;
hdr->msg_complete = 1;
hdr->reserved = 0;
}
int ishtp_hbm_start_req(struct ishtp_device *dev);
int ishtp_hbm_start_wait(struct ishtp_device *dev);
int ishtp_hbm_cl_flow_control_req(struct ishtp_device *dev,
struct ishtp_cl *cl);
int ishtp_hbm_cl_disconnect_req(struct ishtp_device *dev, struct ishtp_cl *cl);
int ishtp_hbm_cl_connect_req(struct ishtp_device *dev, struct ishtp_cl *cl);
void ishtp_hbm_enum_clients_req(struct ishtp_device *dev);
void bh_hbm_work_fn(struct work_struct *work);
void recv_hbm(struct ishtp_device *dev, struct ishtp_msg_hdr *ishtp_hdr);
void recv_fixed_cl_msg(struct ishtp_device *dev,
struct ishtp_msg_hdr *ishtp_hdr);
void ishtp_hbm_dispatch(struct ishtp_device *dev,
struct ishtp_bus_message *hdr);
void ishtp_query_subscribers(struct ishtp_device *dev);
/* Exported I/F */
void ishtp_send_suspend(struct ishtp_device *dev);
void ishtp_send_resume(struct ishtp_device *dev);
#endif /* _ISHTP_HBM_H_ */
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