Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 861 insertions, 0 deletions

diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
new file mode 100644
index 000000000..6bb3e1ba9
--- /dev/null
+++ b/drivers/misc/mei/mei_dev.h
@@ -0,0 +1,861 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
+ * Intel Management Engine Interface (Intel MEI) Linux driver
+ */
+
+#ifndef _MEI_DEV_H_
+#define _MEI_DEV_H_
+
+#include <linux/types.h>
+#include <linux/cdev.h>
+#include <linux/poll.h>
+#include <linux/mei.h>
+#include <linux/mei_cl_bus.h>
+
+#include "hw.h"
+#include "hbm.h"
+
+#define MEI_SLOT_SIZE             sizeof(u32)
+#define MEI_RD_MSG_BUF_SIZE       (128 * MEI_SLOT_SIZE)
+
+/*
+ * Number of Maximum MEI Clients
+ */
+#define MEI_CLIENTS_MAX 256
+
+/*
+ * maximum number of consecutive resets
+ */
+#define MEI_MAX_CONSEC_RESET  3
+
+/*
+ * Number of File descriptors/handles
+ * that can be opened to the driver.
+ *
+ * Limit to 255: 256 Total Clients
+ * minus internal client for MEI Bus Messages
+ */
+#define  MEI_MAX_OPEN_HANDLE_COUNT (MEI_CLIENTS_MAX - 1)
+
+/* File state */
+enum file_state {
+	MEI_FILE_UNINITIALIZED = 0,
+	MEI_FILE_INITIALIZING,
+	MEI_FILE_CONNECTING,
+	MEI_FILE_CONNECTED,
+	MEI_FILE_DISCONNECTING,
+	MEI_FILE_DISCONNECT_REPLY,
+	MEI_FILE_DISCONNECT_REQUIRED,
+	MEI_FILE_DISCONNECTED,
+};
+
+/* MEI device states */
+enum mei_dev_state {
+	MEI_DEV_INITIALIZING = 0,
+	MEI_DEV_INIT_CLIENTS,
+	MEI_DEV_ENABLED,
+	MEI_DEV_RESETTING,
+	MEI_DEV_DISABLED,
+	MEI_DEV_POWERING_DOWN,
+	MEI_DEV_POWER_DOWN,
+	MEI_DEV_POWER_UP
+};
+
+/**
+ * enum mei_dev_pxp_mode - MEI PXP mode state
+ *
+ * @MEI_DEV_PXP_DEFAULT: PCH based device, no initailization required
+ * @MEI_DEV_PXP_INIT:    device requires initialization, send setup message to firmware
+ * @MEI_DEV_PXP_SETUP:   device is in setup stage, waiting for firmware repsonse
+ * @MEI_DEV_PXP_READY:   device initialized
+ */
+enum mei_dev_pxp_mode {
+	MEI_DEV_PXP_DEFAULT = 0,
+	MEI_DEV_PXP_INIT    = 1,
+	MEI_DEV_PXP_SETUP   = 2,
+	MEI_DEV_PXP_READY   = 3,
+};
+
+const char *mei_dev_state_str(int state);
+
+enum mei_file_transaction_states {
+	MEI_IDLE,
+	MEI_WRITING,
+	MEI_WRITE_COMPLETE,
+};
+
+/**
+ * enum mei_cb_file_ops  - file operation associated with the callback
+ * @MEI_FOP_READ:       read
+ * @MEI_FOP_WRITE:      write
+ * @MEI_FOP_CONNECT:    connect
+ * @MEI_FOP_DISCONNECT: disconnect
+ * @MEI_FOP_DISCONNECT_RSP: disconnect response
+ * @MEI_FOP_NOTIFY_START:   start notification
+ * @MEI_FOP_NOTIFY_STOP:    stop notification
+ * @MEI_FOP_DMA_MAP:   request client dma map
+ * @MEI_FOP_DMA_UNMAP: request client dma unmap
+ */
+enum mei_cb_file_ops {
+	MEI_FOP_READ = 0,
+	MEI_FOP_WRITE,
+	MEI_FOP_CONNECT,
+	MEI_FOP_DISCONNECT,
+	MEI_FOP_DISCONNECT_RSP,
+	MEI_FOP_NOTIFY_START,
+	MEI_FOP_NOTIFY_STOP,
+	MEI_FOP_DMA_MAP,
+	MEI_FOP_DMA_UNMAP,
+};
+
+/**
+ * enum mei_cl_io_mode - io mode between driver and fw
+ *
+ * @MEI_CL_IO_TX_BLOCKING: send is blocking
+ * @MEI_CL_IO_TX_INTERNAL: internal communication between driver and FW
+ *
+ * @MEI_CL_IO_RX_NONBLOCK: recv is non-blocking
+ */
+enum mei_cl_io_mode {
+	MEI_CL_IO_TX_BLOCKING = BIT(0),
+	MEI_CL_IO_TX_INTERNAL = BIT(1),
+
+	MEI_CL_IO_RX_NONBLOCK = BIT(2),
+};
+
+/*
+ * Intel MEI message data struct
+ */
+struct mei_msg_data {
+	size_t size;
+	unsigned char *data;
+};
+
+struct mei_dma_data {
+	u8 buffer_id;
+	void *vaddr;
+	dma_addr_t daddr;
+	size_t size;
+};
+
+/**
+ * struct mei_dma_dscr - dma address descriptor
+ *
+ * @vaddr: dma buffer virtual address
+ * @daddr: dma buffer physical address
+ * @size : dma buffer size
+ */
+struct mei_dma_dscr {
+	void *vaddr;
+	dma_addr_t daddr;
+	size_t size;
+};
+
+/* Maximum number of processed FW status registers */
+#define MEI_FW_STATUS_MAX 6
+/* Minimal  buffer for FW status string (8 bytes in dw + space or '\0') */
+#define MEI_FW_STATUS_STR_SZ (MEI_FW_STATUS_MAX * (8 + 1))
+
+
+/*
+ * struct mei_fw_status - storage of FW status data
+ *
+ * @count: number of actually available elements in array
+ * @status: FW status registers
+ */
+struct mei_fw_status {
+	int count;
+	u32 status[MEI_FW_STATUS_MAX];
+};
+
+/**
+ * struct mei_me_client - representation of me (fw) client
+ *
+ * @list: link in me client list
+ * @refcnt: struct reference count
+ * @props: client properties
+ * @client_id: me client id
+ * @tx_flow_ctrl_creds: flow control credits
+ * @connect_count: number connections to this client
+ * @bus_added: added to bus
+ */
+struct mei_me_client {
+	struct list_head list;
+	struct kref refcnt;
+	struct mei_client_properties props;
+	u8 client_id;
+	u8 tx_flow_ctrl_creds;
+	u8 connect_count;
+	u8 bus_added;
+};
+
+
+struct mei_cl;
+
+/**
+ * struct mei_cl_cb - file operation callback structure
+ *
+ * @list: link in callback queue
+ * @cl: file client who is running this operation
+ * @fop_type: file operation type
+ * @buf: buffer for data associated with the callback
+ * @buf_idx: last read index
+ * @vtag: virtual tag
+ * @fp: pointer to file structure
+ * @status: io status of the cb
+ * @internal: communication between driver and FW flag
+ * @blocking: transmission blocking mode
+ */
+struct mei_cl_cb {
+	struct list_head list;
+	struct mei_cl *cl;
+	enum mei_cb_file_ops fop_type;
+	struct mei_msg_data buf;
+	size_t buf_idx;
+	u8 vtag;
+	const struct file *fp;
+	int status;
+	u32 internal:1;
+	u32 blocking:1;
+};
+
+/**
+ * struct mei_cl_vtag - file pointer to vtag mapping structure
+ *
+ * @list: link in map queue
+ * @fp: file pointer
+ * @vtag: corresponding vtag
+ * @pending_read: the read is pending on this file
+ */
+struct mei_cl_vtag {
+	struct list_head list;
+	const struct file *fp;
+	u8 vtag;
+	u8 pending_read:1;
+};
+
+/**
+ * struct mei_cl - me client host representation
+ *    carried in file->private_data
+ *
+ * @link: link in the clients list
+ * @dev: mei parent device
+ * @state: file operation state
+ * @tx_wait: wait queue for tx completion
+ * @rx_wait: wait queue for rx completion
+ * @wait:  wait queue for management operation
+ * @ev_wait: notification wait queue
+ * @ev_async: event async notification
+ * @status: connection status
+ * @me_cl: fw client connected
+ * @fp: file associated with client
+ * @host_client_id: host id
+ * @vtag_map: vtag map
+ * @tx_flow_ctrl_creds: transmit flow credentials
+ * @rx_flow_ctrl_creds: receive flow credentials
+ * @timer_count:  watchdog timer for operation completion
+ * @notify_en: notification - enabled/disabled
+ * @notify_ev: pending notification event
+ * @tx_cb_queued: number of tx callbacks in queue
+ * @writing_state: state of the tx
+ * @rd_pending: pending read credits
+ * @rd_completed_lock: protects rd_completed queue
+ * @rd_completed: completed read
+ * @dma: dma settings
+ * @dma_mapped: dma buffer is currently mapped.
+ *
+ * @cldev: device on the mei client bus
+ */
+struct mei_cl {
+	struct list_head link;
+	struct mei_device *dev;
+	enum file_state state;
+	wait_queue_head_t tx_wait;
+	wait_queue_head_t rx_wait;
+	wait_queue_head_t wait;
+	wait_queue_head_t ev_wait;
+	struct fasync_struct *ev_async;
+	int status;
+	struct mei_me_client *me_cl;
+	const struct file *fp;
+	u8 host_client_id;
+	struct list_head vtag_map;
+	u8 tx_flow_ctrl_creds;
+	u8 rx_flow_ctrl_creds;
+	u8 timer_count;
+	u8 notify_en;
+	u8 notify_ev;
+	u8 tx_cb_queued;
+	enum mei_file_transaction_states writing_state;
+	struct list_head rd_pending;
+	spinlock_t rd_completed_lock; /* protects rd_completed queue */
+	struct list_head rd_completed;
+	struct mei_dma_data dma;
+	u8 dma_mapped;
+
+	struct mei_cl_device *cldev;
+};
+
+#define MEI_TX_QUEUE_LIMIT_DEFAULT 50
+#define MEI_TX_QUEUE_LIMIT_MAX 255
+#define MEI_TX_QUEUE_LIMIT_MIN 30
+
+/**
+ * struct mei_hw_ops - hw specific ops
+ *
+ * @host_is_ready    : query for host readiness
+ *
+ * @hw_is_ready      : query if hw is ready
+ * @hw_reset         : reset hw
+ * @hw_start         : start hw after reset
+ * @hw_config        : configure hw
+ *
+ * @fw_status        : get fw status registers
+ * @trc_status       : get trc status register
+ * @pg_state         : power gating state of the device
+ * @pg_in_transition : is device now in pg transition
+ * @pg_is_enabled    : is power gating enabled
+ *
+ * @intr_clear       : clear pending interrupts
+ * @intr_enable      : enable interrupts
+ * @intr_disable     : disable interrupts
+ * @synchronize_irq  : synchronize irqs
+ *
+ * @hbuf_free_slots  : query for write buffer empty slots
+ * @hbuf_is_ready    : query if write buffer is empty
+ * @hbuf_depth       : query for write buffer depth
+ *
+ * @write            : write a message to FW
+ *
+ * @rdbuf_full_slots : query how many slots are filled
+ *
+ * @read_hdr         : get first 4 bytes (header)
+ * @read             : read a buffer from the FW
+ */
+struct mei_hw_ops {
+
+	bool (*host_is_ready)(struct mei_device *dev);
+
+	bool (*hw_is_ready)(struct mei_device *dev);
+	int (*hw_reset)(struct mei_device *dev, bool enable);
+	int (*hw_start)(struct mei_device *dev);
+	int (*hw_config)(struct mei_device *dev);
+
+	int (*fw_status)(struct mei_device *dev, struct mei_fw_status *fw_sts);
+	int (*trc_status)(struct mei_device *dev, u32 *trc);
+
+	enum mei_pg_state (*pg_state)(struct mei_device *dev);
+	bool (*pg_in_transition)(struct mei_device *dev);
+	bool (*pg_is_enabled)(struct mei_device *dev);
+
+	void (*intr_clear)(struct mei_device *dev);
+	void (*intr_enable)(struct mei_device *dev);
+	void (*intr_disable)(struct mei_device *dev);
+	void (*synchronize_irq)(struct mei_device *dev);
+
+	int (*hbuf_free_slots)(struct mei_device *dev);
+	bool (*hbuf_is_ready)(struct mei_device *dev);
+	u32 (*hbuf_depth)(const struct mei_device *dev);
+	int (*write)(struct mei_device *dev,
+		     const void *hdr, size_t hdr_len,
+		     const void *data, size_t data_len);
+
+	int (*rdbuf_full_slots)(struct mei_device *dev);
+
+	u32 (*read_hdr)(const struct mei_device *dev);
+	int (*read)(struct mei_device *dev,
+		     unsigned char *buf, unsigned long len);
+};
+
+/* MEI bus API*/
+void mei_cl_bus_rescan_work(struct work_struct *work);
+void mei_cl_bus_dev_fixup(struct mei_cl_device *dev);
+ssize_t __mei_cl_send(struct mei_cl *cl, const u8 *buf, size_t length, u8 vtag,
+		      unsigned int mode);
+ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag,
+		      unsigned int mode, unsigned long timeout);
+bool mei_cl_bus_rx_event(struct mei_cl *cl);
+bool mei_cl_bus_notify_event(struct mei_cl *cl);
+void mei_cl_bus_remove_devices(struct mei_device *bus);
+int mei_cl_bus_init(void);
+void mei_cl_bus_exit(void);
+
+/**
+ * enum mei_pg_event - power gating transition events
+ *
+ * @MEI_PG_EVENT_IDLE: the driver is not in power gating transition
+ * @MEI_PG_EVENT_WAIT: the driver is waiting for a pg event to complete
+ * @MEI_PG_EVENT_RECEIVED: the driver received pg event
+ * @MEI_PG_EVENT_INTR_WAIT: the driver is waiting for a pg event interrupt
+ * @MEI_PG_EVENT_INTR_RECEIVED: the driver received pg event interrupt
+ */
+enum mei_pg_event {
+	MEI_PG_EVENT_IDLE,
+	MEI_PG_EVENT_WAIT,
+	MEI_PG_EVENT_RECEIVED,
+	MEI_PG_EVENT_INTR_WAIT,
+	MEI_PG_EVENT_INTR_RECEIVED,
+};
+
+/**
+ * enum mei_pg_state - device internal power gating state
+ *
+ * @MEI_PG_OFF: device is not power gated - it is active
+ * @MEI_PG_ON:  device is power gated - it is in lower power state
+ */
+enum mei_pg_state {
+	MEI_PG_OFF = 0,
+	MEI_PG_ON =  1,
+};
+
+const char *mei_pg_state_str(enum mei_pg_state state);
+
+/**
+ * struct mei_fw_version - MEI FW version struct
+ *
+ * @platform: platform identifier
+ * @major: major version field
+ * @minor: minor version field
+ * @buildno: build number version field
+ * @hotfix: hotfix number version field
+ */
+struct mei_fw_version {
+	u8 platform;
+	u8 major;
+	u16 minor;
+	u16 buildno;
+	u16 hotfix;
+};
+
+#define MEI_MAX_FW_VER_BLOCKS 3
+
+struct mei_dev_timeouts {
+	unsigned long hw_ready; /* Timeout on ready message, in jiffies */
+	int connect; /* HPS: at least 2 seconds, in seconds */
+	unsigned long cl_connect; /* HPS: Client Connect Timeout, in jiffies */
+	int client_init; /* HPS: Clients Enumeration Timeout, in seconds */
+	unsigned long pgi; /* PG Isolation time response, in jiffies */
+	unsigned int d0i3; /* D0i3 set/unset max response time, in jiffies */
+	unsigned long hbm; /* HBM operation timeout, in jiffies */
+	unsigned long mkhi_recv; /* receive timeout, in jiffies */
+};
+
+/**
+ * struct mei_device -  MEI private device struct
+ *
+ * @dev         : device on a bus
+ * @cdev        : character device
+ * @minor       : minor number allocated for device
+ *
+ * @write_list  : write pending list
+ * @write_waiting_list : write completion list
+ * @ctrl_wr_list : pending control write list
+ * @ctrl_rd_list : pending control read list
+ * @tx_queue_limit: tx queues per client linit
+ *
+ * @file_list   : list of opened handles
+ * @open_handle_count: number of opened handles
+ *
+ * @device_lock : big device lock
+ * @timer_work  : MEI timer delayed work (timeouts)
+ *
+ * @recvd_hw_ready : hw ready message received flag
+ *
+ * @wait_hw_ready : wait queue for receive HW ready message form FW
+ * @wait_pg     : wait queue for receive PG message from FW
+ * @wait_hbm_start : wait queue for receive HBM start message from FW
+ *
+ * @reset_count : number of consecutive resets
+ * @dev_state   : device state
+ * @hbm_state   : state of host bus message protocol
+ * @pxp_mode    : PXP device mode
+ * @init_clients_timer : HBM init handshake timeout
+ *
+ * @pg_event    : power gating event
+ * @pg_domain   : runtime PM domain
+ *
+ * @rd_msg_buf  : control messages buffer
+ * @rd_msg_hdr  : read message header storage
+ * @rd_msg_hdr_count : how many dwords were already read from header
+ *
+ * @hbuf_is_ready : query if the host host/write buffer is ready
+ * @dr_dscr: DMA ring descriptors: TX, RX, and CTRL
+ *
+ * @version     : HBM protocol version in use
+ * @hbm_f_pg_supported  : hbm feature pgi protocol
+ * @hbm_f_dc_supported  : hbm feature dynamic clients
+ * @hbm_f_dot_supported : hbm feature disconnect on timeout
+ * @hbm_f_ev_supported  : hbm feature event notification
+ * @hbm_f_fa_supported  : hbm feature fixed address client
+ * @hbm_f_ie_supported  : hbm feature immediate reply to enum request
+ * @hbm_f_os_supported  : hbm feature support OS ver message
+ * @hbm_f_dr_supported  : hbm feature dma ring supported
+ * @hbm_f_vt_supported  : hbm feature vtag supported
+ * @hbm_f_cap_supported : hbm feature capabilities message supported
+ * @hbm_f_cd_supported  : hbm feature client dma supported
+ *
+ * @fw_ver : FW versions
+ *
+ * @fw_f_fw_ver_supported : fw feature: fw version supported
+ *
+ * @me_clients_rwsem: rw lock over me_clients list
+ * @me_clients  : list of FW clients
+ * @me_clients_map : FW clients bit map
+ * @host_clients_map : host clients id pool
+ *
+ * @allow_fixed_address: allow user space to connect a fixed client
+ * @override_fixed_address: force allow fixed address behavior
+ *
+ * @timeouts: actual timeout values
+ *
+ * @reset_work  : work item for the device reset
+ * @bus_rescan_work : work item for the bus rescan
+ *
+ * @device_list : mei client bus list
+ * @cl_bus_lock : client bus list lock
+ *
+ * @kind        : kind of mei device
+ *
+ * @dbgfs_dir   : debugfs mei root directory
+ *
+ * @ops:        : hw specific operations
+ * @hw          : hw specific data
+ */
+struct mei_device {
+	struct device *dev;
+	struct cdev cdev;
+	int minor;
+
+	struct list_head write_list;
+	struct list_head write_waiting_list;
+	struct list_head ctrl_wr_list;
+	struct list_head ctrl_rd_list;
+	u8 tx_queue_limit;
+
+	struct list_head file_list;
+	long open_handle_count;
+
+	struct mutex device_lock;
+	struct delayed_work timer_work;
+
+	bool recvd_hw_ready;
+	/*
+	 * waiting queue for receive message from FW
+	 */
+	wait_queue_head_t wait_hw_ready;
+	wait_queue_head_t wait_pg;
+	wait_queue_head_t wait_hbm_start;
+
+	/*
+	 * mei device  states
+	 */
+	unsigned long reset_count;
+	enum mei_dev_state dev_state;
+	enum mei_hbm_state hbm_state;
+	enum mei_dev_pxp_mode pxp_mode;
+	u16 init_clients_timer;
+
+	/*
+	 * Power Gating support
+	 */
+	enum mei_pg_event pg_event;
+#ifdef CONFIG_PM
+	struct dev_pm_domain pg_domain;
+#endif /* CONFIG_PM */
+
+	unsigned char rd_msg_buf[MEI_RD_MSG_BUF_SIZE];
+	u32 rd_msg_hdr[MEI_RD_MSG_BUF_SIZE];
+	int rd_msg_hdr_count;
+
+	/* write buffer */
+	bool hbuf_is_ready;
+
+	struct mei_dma_dscr dr_dscr[DMA_DSCR_NUM];
+
+	struct hbm_version version;
+	unsigned int hbm_f_pg_supported:1;
+	unsigned int hbm_f_dc_supported:1;
+	unsigned int hbm_f_dot_supported:1;
+	unsigned int hbm_f_ev_supported:1;
+	unsigned int hbm_f_fa_supported:1;
+	unsigned int hbm_f_ie_supported:1;
+	unsigned int hbm_f_os_supported:1;
+	unsigned int hbm_f_dr_supported:1;
+	unsigned int hbm_f_vt_supported:1;
+	unsigned int hbm_f_cap_supported:1;
+	unsigned int hbm_f_cd_supported:1;
+
+	struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS];
+
+	unsigned int fw_f_fw_ver_supported:1;
+
+	struct rw_semaphore me_clients_rwsem;
+	struct list_head me_clients;
+	DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
+	DECLARE_BITMAP(host_clients_map, MEI_CLIENTS_MAX);
+
+	bool allow_fixed_address;
+	bool override_fixed_address;
+
+	struct mei_dev_timeouts timeouts;
+
+	struct work_struct reset_work;
+	struct work_struct bus_rescan_work;
+
+	/* List of bus devices */
+	struct list_head device_list;
+	struct mutex cl_bus_lock;
+
+	const char *kind;
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+	struct dentry *dbgfs_dir;
+#endif /* CONFIG_DEBUG_FS */
+
+	const struct mei_hw_ops *ops;
+	char hw[] __aligned(sizeof(void *));
+};
+
+static inline unsigned long mei_secs_to_jiffies(unsigned long sec)
+{
+	return msecs_to_jiffies(sec * MSEC_PER_SEC);
+}
+
+/**
+ * mei_data2slots - get slots number from a message length
+ *
+ * @length: size of the messages in bytes
+ *
+ * Return: number of slots
+ */
+static inline u32 mei_data2slots(size_t length)
+{
+	return DIV_ROUND_UP(length, MEI_SLOT_SIZE);
+}
+
+/**
+ * mei_hbm2slots - get slots number from a hbm message length
+ *                 length + size of the mei message header
+ *
+ * @length: size of the messages in bytes
+ *
+ * Return: number of slots
+ */
+static inline u32 mei_hbm2slots(size_t length)
+{
+	return DIV_ROUND_UP(sizeof(struct mei_msg_hdr) + length, MEI_SLOT_SIZE);
+}
+
+/**
+ * mei_slots2data - get data in slots - bytes from slots
+ *
+ * @slots: number of available slots
+ *
+ * Return: number of bytes in slots
+ */
+static inline u32 mei_slots2data(int slots)
+{
+	return slots * MEI_SLOT_SIZE;
+}
+
+/*
+ * mei init function prototypes
+ */
+void mei_device_init(struct mei_device *dev,
+		     struct device *device,
+		     bool slow_fw,
+		     const struct mei_hw_ops *hw_ops);
+int mei_reset(struct mei_device *dev);
+int mei_start(struct mei_device *dev);
+int mei_restart(struct mei_device *dev);
+void mei_stop(struct mei_device *dev);
+void mei_cancel_work(struct mei_device *dev);
+
+void mei_set_devstate(struct mei_device *dev, enum mei_dev_state state);
+
+int mei_dmam_ring_alloc(struct mei_device *dev);
+void mei_dmam_ring_free(struct mei_device *dev);
+bool mei_dma_ring_is_allocated(struct mei_device *dev);
+void mei_dma_ring_reset(struct mei_device *dev);
+void mei_dma_ring_read(struct mei_device *dev, unsigned char *buf, u32 len);
+void mei_dma_ring_write(struct mei_device *dev, unsigned char *buf, u32 len);
+u32 mei_dma_ring_empty_slots(struct mei_device *dev);
+
+/*
+ *  MEI interrupt functions prototype
+ */
+
+void mei_timer(struct work_struct *work);
+void mei_schedule_stall_timer(struct mei_device *dev);
+int mei_irq_read_handler(struct mei_device *dev,
+			 struct list_head *cmpl_list, s32 *slots);
+
+int mei_irq_write_handler(struct mei_device *dev, struct list_head *cmpl_list);
+void mei_irq_compl_handler(struct mei_device *dev, struct list_head *cmpl_list);
+
+/*
+ * Register Access Function
+ */
+
+
+static inline int mei_hw_config(struct mei_device *dev)
+{
+	return dev->ops->hw_config(dev);
+}
+
+static inline enum mei_pg_state mei_pg_state(struct mei_device *dev)
+{
+	return dev->ops->pg_state(dev);
+}
+
+static inline bool mei_pg_in_transition(struct mei_device *dev)
+{
+	return dev->ops->pg_in_transition(dev);
+}
+
+static inline bool mei_pg_is_enabled(struct mei_device *dev)
+{
+	return dev->ops->pg_is_enabled(dev);
+}
+
+static inline int mei_hw_reset(struct mei_device *dev, bool enable)
+{
+	return dev->ops->hw_reset(dev, enable);
+}
+
+static inline int mei_hw_start(struct mei_device *dev)
+{
+	return dev->ops->hw_start(dev);
+}
+
+static inline void mei_clear_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_clear(dev);
+}
+
+static inline void mei_enable_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_enable(dev);
+}
+
+static inline void mei_disable_interrupts(struct mei_device *dev)
+{
+	dev->ops->intr_disable(dev);
+}
+
+static inline void mei_synchronize_irq(struct mei_device *dev)
+{
+	dev->ops->synchronize_irq(dev);
+}
+
+static inline bool mei_host_is_ready(struct mei_device *dev)
+{
+	return dev->ops->host_is_ready(dev);
+}
+static inline bool mei_hw_is_ready(struct mei_device *dev)
+{
+	return dev->ops->hw_is_ready(dev);
+}
+
+static inline bool mei_hbuf_is_ready(struct mei_device *dev)
+{
+	return dev->ops->hbuf_is_ready(dev);
+}
+
+static inline int mei_hbuf_empty_slots(struct mei_device *dev)
+{
+	return dev->ops->hbuf_free_slots(dev);
+}
+
+static inline u32 mei_hbuf_depth(const struct mei_device *dev)
+{
+	return dev->ops->hbuf_depth(dev);
+}
+
+static inline int mei_write_message(struct mei_device *dev,
+				    const void *hdr, size_t hdr_len,
+				    const void *data, size_t data_len)
+{
+	return dev->ops->write(dev, hdr, hdr_len, data, data_len);
+}
+
+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);
+}
+
+static inline int mei_trc_status(struct mei_device *dev, u32 *trc)
+{
+	if (dev->ops->trc_status)
+		return dev->ops->trc_status(dev, trc);
+	return -EOPNOTSUPP;
+}
+
+static inline int mei_fw_status(struct mei_device *dev,
+				struct mei_fw_status *fw_status)
+{
+	return dev->ops->fw_status(dev, fw_status);
+}
+
+bool mei_hbuf_acquire(struct mei_device *dev);
+
+bool mei_write_is_idle(struct mei_device *dev);
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+void mei_dbgfs_register(struct mei_device *dev, const char *name);
+void mei_dbgfs_deregister(struct mei_device *dev);
+#else
+static inline void mei_dbgfs_register(struct mei_device *dev, const char *name) {}
+static inline void mei_dbgfs_deregister(struct mei_device *dev) {}
+#endif /* CONFIG_DEBUG_FS */
+
+int mei_register(struct mei_device *dev, struct device *parent);
+void mei_deregister(struct mei_device *dev);
+
+#define MEI_HDR_FMT "hdr:host=%02d me=%02d len=%d dma=%1d ext=%1d internal=%1d comp=%1d"
+#define MEI_HDR_PRM(hdr)                  \
+	(hdr)->host_addr, (hdr)->me_addr, \
+	(hdr)->length, (hdr)->dma_ring, (hdr)->extended, \
+	(hdr)->internal, (hdr)->msg_complete
+
+ssize_t mei_fw_status2str(struct mei_fw_status *fw_sts, char *buf, size_t len);
+/**
+ * mei_fw_status_str - fetch and convert fw status registers to printable string
+ *
+ * @dev: the device structure
+ * @buf: string buffer at minimal size MEI_FW_STATUS_STR_SZ
+ * @len: buffer len must be >= MEI_FW_STATUS_STR_SZ
+ *
+ * Return: number of bytes written or < 0 on failure
+ */
+static inline ssize_t mei_fw_status_str(struct mei_device *dev,
+					char *buf, size_t len)
+{
+	struct mei_fw_status fw_status;
+	int ret;
+
+	buf[0] = '\0';
+
+	ret = mei_fw_status(dev, &fw_status);
+	if (ret)
+		return ret;
+
+	ret = mei_fw_status2str(&fw_status, buf, MEI_FW_STATUS_STR_SZ);
+
+	return ret;
+}
+
+
+#endif