635 lines
16 KiB
C
635 lines
16 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2003-2012, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#ifndef _MEI_DEV_H_
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#define _MEI_DEV_H_
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#include <linux/poll.h>
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#include <linux/mei.h>
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#include <linux/mei_cl_bus.h>
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#include "hw.h"
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#include "hw-me-regs.h"
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#include "hbm.h"
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/*
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* watch dog definition
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*/
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#define MEI_WD_HDR_SIZE 4
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#define MEI_WD_STOP_MSG_SIZE MEI_WD_HDR_SIZE
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#define MEI_WD_START_MSG_SIZE (MEI_WD_HDR_SIZE + 16)
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#define MEI_WD_DEFAULT_TIMEOUT 120 /* seconds */
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#define MEI_WD_MIN_TIMEOUT 120 /* seconds */
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#define MEI_WD_MAX_TIMEOUT 65535 /* seconds */
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#define MEI_WD_STOP_TIMEOUT 10 /* msecs */
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#define MEI_WD_STATE_INDEPENDENCE_MSG_SENT (1 << 0)
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#define MEI_RD_MSG_BUF_SIZE (128 * sizeof(u32))
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/*
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* AMTHI Client UUID
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*/
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extern const uuid_le mei_amthif_guid;
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/*
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* Watchdog Client UUID
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*/
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extern const uuid_le mei_wd_guid;
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/*
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* Number of Maximum MEI Clients
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*/
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#define MEI_CLIENTS_MAX 256
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/*
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* Number of File descriptors/handles
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* that can be opened to the driver.
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*
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* Limit to 255: 256 Total Clients
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* minus internal client for MEI Bus Messags
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*/
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#define MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
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/*
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* Internal Clients Number
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*/
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#define MEI_HOST_CLIENT_ID_ANY (-1)
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#define MEI_HBM_HOST_CLIENT_ID 0 /* not used, just for documentation */
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#define MEI_WD_HOST_CLIENT_ID 1
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#define MEI_IAMTHIF_HOST_CLIENT_ID 2
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/* File state */
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enum file_state {
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MEI_FILE_INITIALIZING = 0,
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MEI_FILE_CONNECTING,
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MEI_FILE_CONNECTED,
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MEI_FILE_DISCONNECTING,
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MEI_FILE_DISCONNECTED
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};
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/* MEI device states */
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enum mei_dev_state {
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MEI_DEV_INITIALIZING = 0,
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MEI_DEV_INIT_CLIENTS,
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MEI_DEV_ENABLED,
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MEI_DEV_RESETTING,
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MEI_DEV_DISABLED,
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MEI_DEV_POWER_DOWN,
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MEI_DEV_POWER_UP
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};
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const char *mei_dev_state_str(int state);
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enum iamthif_states {
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MEI_IAMTHIF_IDLE,
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MEI_IAMTHIF_WRITING,
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MEI_IAMTHIF_FLOW_CONTROL,
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MEI_IAMTHIF_READING,
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MEI_IAMTHIF_READ_COMPLETE
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};
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enum mei_file_transaction_states {
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MEI_IDLE,
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MEI_WRITING,
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MEI_WRITE_COMPLETE,
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MEI_FLOW_CONTROL,
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MEI_READING,
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MEI_READ_COMPLETE
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};
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enum mei_wd_states {
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MEI_WD_IDLE,
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MEI_WD_RUNNING,
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MEI_WD_STOPPING,
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};
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/**
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* enum mei_cb_file_ops - file operation associated with the callback
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* @MEI_FOP_READ - read
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* @MEI_FOP_WRITE - write
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* @MEI_FOP_IOCTL - ioctl
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* @MEI_FOP_OPEN - open
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* @MEI_FOP_CLOSE - close
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*/
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enum mei_cb_file_ops {
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MEI_FOP_READ = 0,
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MEI_FOP_WRITE,
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MEI_FOP_IOCTL,
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MEI_FOP_OPEN,
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MEI_FOP_CLOSE
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};
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/*
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* Intel MEI message data struct
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*/
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struct mei_msg_data {
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u32 size;
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unsigned char *data;
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};
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/**
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* struct mei_me_client - representation of me (fw) client
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*
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* @props - client properties
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* @client_id - me client id
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* @mei_flow_ctrl_creds - flow control credits
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*/
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struct mei_me_client {
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struct mei_client_properties props;
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u8 client_id;
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u8 mei_flow_ctrl_creds;
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};
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struct mei_cl;
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/**
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* struct mei_cl_cb - file operation callback structure
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*
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* @cl - file client who is running this operation
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* @fop_type - file operation type
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*/
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struct mei_cl_cb {
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struct list_head list;
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struct mei_cl *cl;
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enum mei_cb_file_ops fop_type;
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struct mei_msg_data request_buffer;
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struct mei_msg_data response_buffer;
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unsigned long buf_idx;
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unsigned long read_time;
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struct file *file_object;
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};
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/* MEI client instance carried as file->pirvate_data*/
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struct mei_cl {
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struct list_head link;
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struct mei_device *dev;
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enum file_state state;
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wait_queue_head_t tx_wait;
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wait_queue_head_t rx_wait;
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wait_queue_head_t wait;
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int status;
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/* ID of client connected */
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u8 host_client_id;
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u8 me_client_id;
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u8 mei_flow_ctrl_creds;
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u8 timer_count;
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enum mei_file_transaction_states reading_state;
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enum mei_file_transaction_states writing_state;
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struct mei_cl_cb *read_cb;
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/* MEI CL bus data */
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struct mei_cl_device *device;
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struct list_head device_link;
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uuid_le device_uuid;
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};
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/** struct mei_hw_ops
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*
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* @host_is_ready - query for host readiness
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* @hw_is_ready - query if hw is ready
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* @hw_reset - reset hw
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* @hw_start - start hw after reset
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* @hw_config - configure hw
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* @intr_clear - clear pending interrupts
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* @intr_enable - enable interrupts
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* @intr_disable - disable interrupts
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* @hbuf_free_slots - query for write buffer empty slots
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* @hbuf_is_ready - query if write buffer is empty
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* @hbuf_max_len - query for write buffer max len
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* @write - write a message to FW
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* @rdbuf_full_slots - query how many slots are filled
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* @read_hdr - get first 4 bytes (header)
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* @read - read a buffer from the FW
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*/
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struct mei_hw_ops {
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bool (*host_is_ready) (struct mei_device *dev);
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bool (*hw_is_ready) (struct mei_device *dev);
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int (*hw_reset) (struct mei_device *dev, bool enable);
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int (*hw_start) (struct mei_device *dev);
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void (*hw_config) (struct mei_device *dev);
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void (*intr_clear) (struct mei_device *dev);
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void (*intr_enable) (struct mei_device *dev);
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void (*intr_disable) (struct mei_device *dev);
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int (*hbuf_free_slots) (struct mei_device *dev);
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bool (*hbuf_is_ready) (struct mei_device *dev);
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size_t (*hbuf_max_len) (const struct mei_device *dev);
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int (*write)(struct mei_device *dev,
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struct mei_msg_hdr *hdr,
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unsigned char *buf);
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int (*rdbuf_full_slots)(struct mei_device *dev);
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u32 (*read_hdr)(const struct mei_device *dev);
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int (*read) (struct mei_device *dev,
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unsigned char *buf, unsigned long len);
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};
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/* MEI bus API*/
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/**
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* struct mei_cl_ops - MEI CL device ops
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* This structure allows ME host clients to implement technology
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* specific operations.
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*
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* @enable: Enable an MEI CL device. Some devices require specific
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* HECI commands to initialize completely.
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* @disable: Disable an MEI CL device.
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* @send: Tx hook for the device. This allows ME host clients to trap
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* the device driver buffers before actually physically
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* pushing it to the ME.
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* @recv: Rx hook for the device. This allows ME host clients to trap the
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* ME buffers before forwarding them to the device driver.
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*/
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struct mei_cl_ops {
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int (*enable)(struct mei_cl_device *device);
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int (*disable)(struct mei_cl_device *device);
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int (*send)(struct mei_cl_device *device, u8 *buf, size_t length);
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int (*recv)(struct mei_cl_device *device, u8 *buf, size_t length);
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};
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struct mei_cl_device *mei_cl_add_device(struct mei_device *dev,
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uuid_le uuid, char *name,
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struct mei_cl_ops *ops);
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void mei_cl_remove_device(struct mei_cl_device *device);
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int __mei_cl_async_send(struct mei_cl *cl, u8 *buf, size_t length);
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int __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length);
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int __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length);
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void mei_cl_bus_rx_event(struct mei_cl *cl);
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int mei_cl_bus_init(void);
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void mei_cl_bus_exit(void);
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/**
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* struct mei_cl_device - MEI device handle
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* An mei_cl_device pointer is returned from mei_add_device()
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* and links MEI bus clients to their actual ME host client pointer.
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* Drivers for MEI devices will get an mei_cl_device pointer
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* when being probed and shall use it for doing ME bus I/O.
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*
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* @dev: linux driver model device pointer
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* @uuid: me client uuid
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* @cl: mei client
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* @ops: ME transport ops
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* @event_cb: Drivers register this callback to get asynchronous ME
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* events (e.g. Rx buffer pending) notifications.
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* @events: Events bitmask sent to the driver.
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* @priv_data: client private data
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*/
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struct mei_cl_device {
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struct device dev;
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struct mei_cl *cl;
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const struct mei_cl_ops *ops;
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struct work_struct event_work;
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mei_cl_event_cb_t event_cb;
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void *event_context;
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unsigned long events;
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void *priv_data;
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};
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/**
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* struct mei_device - MEI private device struct
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* @hbm_state - state of host bus message protocol
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* @mem_addr - mem mapped base register address
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* @hbuf_depth - depth of hardware host/write buffer is slots
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* @hbuf_is_ready - query if the host host/write buffer is ready
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* @wr_msg - the buffer for hbm control messages
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* @wr_ext_msg - the buffer for hbm control responses (set in read cycle)
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*/
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struct mei_device {
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struct pci_dev *pdev; /* pointer to pci device struct */
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/*
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* lists of queues
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*/
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/* array of pointers to aio lists */
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struct mei_cl_cb read_list; /* driver read queue */
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struct mei_cl_cb write_list; /* driver write queue */
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struct mei_cl_cb write_waiting_list; /* write waiting queue */
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struct mei_cl_cb ctrl_wr_list; /* managed write IOCTL list */
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struct mei_cl_cb ctrl_rd_list; /* managed read IOCTL list */
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/*
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* list of files
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*/
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struct list_head file_list;
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long open_handle_count;
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/*
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* lock for the device
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*/
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struct mutex device_lock; /* device lock */
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struct delayed_work timer_work; /* MEI timer delayed work (timeouts) */
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bool recvd_hw_ready;
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/*
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* waiting queue for receive message from FW
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*/
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wait_queue_head_t wait_hw_ready;
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wait_queue_head_t wait_recvd_msg;
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wait_queue_head_t wait_stop_wd;
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/*
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* mei device states
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*/
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enum mei_dev_state dev_state;
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enum mei_hbm_state hbm_state;
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u16 init_clients_timer;
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unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE]; /* control messages */
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u32 rd_msg_hdr;
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/* write buffer */
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u8 hbuf_depth;
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bool hbuf_is_ready;
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/* used for control messages */
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struct {
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struct mei_msg_hdr hdr;
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unsigned char data[128];
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} wr_msg;
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struct {
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struct mei_msg_hdr hdr;
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unsigned char data[4]; /* All HBM messages are 4 bytes */
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} wr_ext_msg; /* for control responses */
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struct hbm_version version;
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struct mei_me_client *me_clients; /* Note: memory has to be allocated */
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DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
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DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
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unsigned long me_clients_num;
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unsigned long me_client_presentation_num;
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unsigned long me_client_index;
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struct mei_cl wd_cl;
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enum mei_wd_states wd_state;
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bool wd_pending;
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u16 wd_timeout;
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unsigned char wd_data[MEI_WD_START_MSG_SIZE];
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/* amthif list for cmd waiting */
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struct mei_cl_cb amthif_cmd_list;
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/* driver managed amthif list for reading completed amthif cmd data */
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struct mei_cl_cb amthif_rd_complete_list;
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struct file *iamthif_file_object;
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struct mei_cl iamthif_cl;
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struct mei_cl_cb *iamthif_current_cb;
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long iamthif_open_count;
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int iamthif_mtu;
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unsigned long iamthif_timer;
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u32 iamthif_stall_timer;
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unsigned char *iamthif_msg_buf; /* Note: memory has to be allocated */
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u32 iamthif_msg_buf_size;
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u32 iamthif_msg_buf_index;
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enum iamthif_states iamthif_state;
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bool iamthif_flow_control_pending;
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bool iamthif_ioctl;
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bool iamthif_canceled;
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struct work_struct init_work;
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/* List of bus devices */
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struct list_head device_list;
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#if IS_ENABLED(CONFIG_DEBUG_FS)
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struct dentry *dbgfs_dir;
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#endif /* CONFIG_DEBUG_FS */
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const struct mei_hw_ops *ops;
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char hw[0] __aligned(sizeof(void *));
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};
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static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
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{
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return msecs_to_jiffies(sec * MSEC_PER_SEC);
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}
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/**
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* mei_data2slots - get slots - number of (dwords) from a message length
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* + size of the mei header
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* @length - size of the messages in bytes
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* returns - number of slots
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*/
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static inline u32 mei_data2slots(size_t length)
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{
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return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, 4);
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}
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/*
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* mei init function prototypes
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*/
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void mei_device_init(struct mei_device *dev);
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void mei_reset(struct mei_device *dev, int interrupts);
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int mei_start(struct mei_device *dev);
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void mei_stop(struct mei_device *dev);
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/*
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* MEI interrupt functions prototype
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*/
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void mei_timer(struct work_struct *work);
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int mei_irq_read_handler(struct mei_device *dev,
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struct mei_cl_cb *cmpl_list, s32 *slots);
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int mei_irq_write_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
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void mei_irq_compl_handler(struct mei_device *dev, struct mei_cl_cb *cmpl_list);
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/*
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* AMTHIF - AMT Host Interface Functions
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*/
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void mei_amthif_reset_params(struct mei_device *dev);
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int mei_amthif_host_init(struct mei_device *dev);
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int mei_amthif_write(struct mei_device *dev, struct mei_cl_cb *priv_cb);
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int mei_amthif_read(struct mei_device *dev, struct file *file,
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char __user *ubuf, size_t length, loff_t *offset);
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unsigned int mei_amthif_poll(struct mei_device *dev,
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struct file *file, poll_table *wait);
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int mei_amthif_release(struct mei_device *dev, struct file *file);
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struct mei_cl_cb *mei_amthif_find_read_list_entry(struct mei_device *dev,
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struct file *file);
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void mei_amthif_run_next_cmd(struct mei_device *dev);
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int mei_amthif_irq_write_complete(struct mei_cl *cl, struct mei_cl_cb *cb,
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s32 *slots, struct mei_cl_cb *cmpl_list);
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void mei_amthif_complete(struct mei_device *dev, struct mei_cl_cb *cb);
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int mei_amthif_irq_read_msg(struct mei_device *dev,
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struct mei_msg_hdr *mei_hdr,
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struct mei_cl_cb *complete_list);
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int mei_amthif_irq_read(struct mei_device *dev, s32 *slots);
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/*
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* NFC functions
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*/
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int mei_nfc_host_init(struct mei_device *dev);
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void mei_nfc_host_exit(void);
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|
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/*
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* NFC Client UUID
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*/
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extern const uuid_le mei_nfc_guid;
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|
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int mei_wd_send(struct mei_device *dev);
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int mei_wd_stop(struct mei_device *dev);
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int mei_wd_host_init(struct mei_device *dev);
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/*
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* mei_watchdog_register - Registering watchdog interface
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* once we got connection to the WD Client
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* @dev - mei device
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|
*/
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void mei_watchdog_register(struct mei_device *dev);
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/*
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* mei_watchdog_unregister - Unregistering watchdog interface
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|
* @dev - mei device
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|
*/
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void mei_watchdog_unregister(struct mei_device *dev);
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|
|
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/*
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|
* Register Access Function
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|
*/
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|
|
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static inline void mei_hw_config(struct mei_device *dev)
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|
{
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dev->ops->hw_config(dev);
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}
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static inline int mei_hw_reset(struct mei_device *dev, bool enable)
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|
{
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return dev->ops->hw_reset(dev, enable);
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}
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|
|
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static inline int mei_hw_start(struct mei_device *dev)
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|
{
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|
return dev->ops->hw_start(dev);
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|
}
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|
|
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static inline void mei_clear_interrupts(struct mei_device *dev)
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|
{
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|
dev->ops->intr_clear(dev);
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}
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|
|
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static inline void mei_enable_interrupts(struct mei_device *dev)
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|
{
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|
dev->ops->intr_enable(dev);
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|
}
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|
|
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static inline void mei_disable_interrupts(struct mei_device *dev)
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|
{
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|
dev->ops->intr_disable(dev);
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|
}
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|
|
|
static inline bool mei_host_is_ready(struct mei_device *dev)
|
|
{
|
|
return dev->ops->host_is_ready(dev);
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|
}
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|
static inline bool mei_hw_is_ready(struct mei_device *dev)
|
|
{
|
|
return dev->ops->hw_is_ready(dev);
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|
}
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|
|
|
static inline bool mei_hbuf_is_ready(struct mei_device *dev)
|
|
{
|
|
return dev->ops->hbuf_is_ready(dev);
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|
}
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|
|
|
static inline int mei_hbuf_empty_slots(struct mei_device *dev)
|
|
{
|
|
return dev->ops->hbuf_free_slots(dev);
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|
}
|
|
|
|
static inline size_t mei_hbuf_max_len(const struct mei_device *dev)
|
|
{
|
|
return dev->ops->hbuf_max_len(dev);
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|
}
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|
|
|
static inline int mei_write_message(struct mei_device *dev,
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|
struct mei_msg_hdr *hdr,
|
|
unsigned char *buf)
|
|
{
|
|
return dev->ops->write(dev, hdr, buf);
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|
}
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|
|
|
static inline u32 mei_read_hdr(const struct mei_device *dev)
|
|
{
|
|
return dev->ops->read_hdr(dev);
|
|
}
|
|
|
|
static inline void mei_read_slots(struct mei_device *dev,
|
|
unsigned char *buf, unsigned long len)
|
|
{
|
|
dev->ops->read(dev, buf, len);
|
|
}
|
|
|
|
static inline int mei_count_full_read_slots(struct mei_device *dev)
|
|
{
|
|
return dev->ops->rdbuf_full_slots(dev);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_DEBUG_FS)
|
|
int mei_dbgfs_register(struct mei_device *dev, const char *name);
|
|
void mei_dbgfs_deregister(struct mei_device *dev);
|
|
#else
|
|
static inline int mei_dbgfs_register(struct mei_device *dev, const char *name)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
int mei_register(struct mei_device *dev);
|
|
void mei_deregister(struct mei_device *dev);
|
|
|
|
#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d comp=%1d"
|
|
#define MEI_HDR_PRM(hdr) \
|
|
(hdr)->host_addr, (hdr)->me_addr, \
|
|
(hdr)->length, (hdr)->msg_complete
|
|
|
|
#endif
|