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/* SPDX-License-Identifier: GPL-2.0-only
*
* Copyright (C) 2020-21 Intel Corporation.
*/
#ifndef IOSM_IPC_PROTOCOL_H
#define IOSM_IPC_PROTOCOL_H
#include "iosm_ipc_imem.h"
#include "iosm_ipc_pm.h"
#include "iosm_ipc_protocol_ops.h"
/* Trigger the doorbell interrupt on CP. */
#define IPC_DOORBELL_IRQ_HPDA 0
#define IPC_DOORBELL_IRQ_IPC 1
#define IPC_DOORBELL_IRQ_SLEEP 2
/* IRQ vector number. */
#define IPC_DEVICE_IRQ_VECTOR 0
#define IPC_MSG_IRQ_VECTOR 0
#define IPC_UL_PIPE_IRQ_VECTOR 0
#define IPC_DL_PIPE_IRQ_VECTOR 0
#define IPC_MEM_MSG_ENTRIES 128
/* Default time out for sending IPC messages like open pipe, close pipe etc.
* during run mode.
*
* If the message interface lock to CP times out, the link to CP is broken.
* mode : run mode (IPC_MEM_EXEC_STAGE_RUN)
* unit : milliseconds
*/
#define IPC_MSG_COMPLETE_RUN_DEFAULT_TIMEOUT 500 /* 0.5 seconds */
/* Default time out for sending IPC messages like open pipe, close pipe etc.
* during boot mode.
*
* If the message interface lock to CP times out, the link to CP is broken.
* mode : boot mode
* (IPC_MEM_EXEC_STAGE_BOOT | IPC_MEM_EXEC_STAGE_PSI | IPC_MEM_EXEC_STAGE_EBL)
* unit : milliseconds
*/
#define IPC_MSG_COMPLETE_BOOT_DEFAULT_TIMEOUT 500 /* 0.5 seconds */
/**
* struct ipc_protocol_context_info - Structure of the context info
* @device_info_addr: 64 bit address to device info
* @head_array: 64 bit address to head pointer arr for the pipes
* @tail_array: 64 bit address to tail pointer arr for the pipes
* @msg_head: 64 bit address to message head pointer
* @msg_tail: 64 bit address to message tail pointer
* @msg_ring_addr: 64 bit pointer to the message ring buffer
* @msg_ring_entries: This field provides the number of entries which
* the MR can hold
* @msg_irq_vector: This field provides the IRQ which shall be
* generated by the EP device when generating
* completion for Messages.
* @device_info_irq_vector: This field provides the IRQ which shall be
* generated by the EP dev after updating Dev. Info
*/
struct ipc_protocol_context_info {
phys_addr_t device_info_addr;
phys_addr_t head_array;
phys_addr_t tail_array;
phys_addr_t msg_head;
phys_addr_t msg_tail;
phys_addr_t msg_ring_addr;
__le16 msg_ring_entries;
u8 msg_irq_vector;
u8 device_info_irq_vector;
};
/**
* struct ipc_protocol_device_info - Structure for the device information
* @execution_stage: CP execution stage
* @ipc_status: IPC states
* @device_sleep_notification: Requested device pm states
*/
struct ipc_protocol_device_info {
__le32 execution_stage;
__le32 ipc_status;
__le32 device_sleep_notification;
};
/**
* struct ipc_protocol_ap_shm - Protocol Shared Memory Structure
* @ci: Context information struct
* @device_info: Device information struct
* @msg_head: Point to msg head
* @head_array: Array of head pointer
* @msg_tail: Point to msg tail
* @tail_array: Array of tail pointer
* @msg_ring: Circular buffers for the read/tail and write/head
* indeces.
*/
struct ipc_protocol_ap_shm {
struct ipc_protocol_context_info ci;
struct ipc_protocol_device_info device_info;
__le32 msg_head;
__le32 head_array[IPC_MEM_MAX_PIPES];
__le32 msg_tail;
__le32 tail_array[IPC_MEM_MAX_PIPES];
union ipc_mem_msg_entry msg_ring[IPC_MEM_MSG_ENTRIES];
};
/**
* struct iosm_protocol - Structure for IPC protocol.
* @p_ap_shm: Pointer to Protocol Shared Memory Structure
* @pm: Instance to struct iosm_pm
* @pcie: Pointer to struct iosm_pcie
* @imem: Pointer to struct iosm_imem
* @rsp_ring: Array of OS completion objects to be triggered once CP
* acknowledges a request in the message ring
* @dev: Pointer to device structure
* @phy_ap_shm: Physical/Mapped representation of the shared memory info
* @old_msg_tail: Old msg tail ptr, until AP has handled ACK's from CP
*/
struct iosm_protocol {
struct ipc_protocol_ap_shm *p_ap_shm;
struct iosm_pm pm;
struct iosm_pcie *pcie;
struct iosm_imem *imem;
struct ipc_rsp *rsp_ring[IPC_MEM_MSG_ENTRIES];
struct device *dev;
phys_addr_t phy_ap_shm;
u32 old_msg_tail;
};
/**
* struct ipc_call_msg_send_args - Structure for message argument for
* tasklet function.
* @prep_args: Arguments for message preparation function
* @response: Can be NULL if result can be ignored
* @msg_type: Message Type
*/
struct ipc_call_msg_send_args {
union ipc_msg_prep_args *prep_args;
struct ipc_rsp *response;
enum ipc_msg_prep_type msg_type;
};
/**
* ipc_protocol_tq_msg_send - prepare the msg and send to CP
* @ipc_protocol: Pointer to ipc_protocol instance
* @msg_type: Message type
* @prep_args: Message arguments
* @response: Pointer to a response object which has a
* completion object and return code.
*
* Returns: 0 on success and failure value on error
*/
int ipc_protocol_tq_msg_send(struct iosm_protocol *ipc_protocol,
enum ipc_msg_prep_type msg_type,
union ipc_msg_prep_args *prep_args,
struct ipc_rsp *response);
/**
* ipc_protocol_msg_send - Send ipc control message to CP and wait for response
* @ipc_protocol: Pointer to ipc_protocol instance
* @prep: Message type
* @prep_args: Message arguments
*
* Returns: 0 on success and failure value on error
*/
int ipc_protocol_msg_send(struct iosm_protocol *ipc_protocol,
enum ipc_msg_prep_type prep,
union ipc_msg_prep_args *prep_args);
/**
* ipc_protocol_suspend - Signal to CP that host wants to go to sleep (suspend).
* @ipc_protocol: Pointer to ipc_protocol instance
*
* Returns: true if host can suspend, false if suspend must be aborted.
*/
bool ipc_protocol_suspend(struct iosm_protocol *ipc_protocol);
/**
* ipc_protocol_s2idle_sleep - Call PM function to set PM variables in s2idle
* sleep/active case
* @ipc_protocol: Pointer to ipc_protocol instance
* @sleep: True for sleep/False for active
*/
void ipc_protocol_s2idle_sleep(struct iosm_protocol *ipc_protocol, bool sleep);
/**
* ipc_protocol_resume - Signal to CP that host wants to resume operation.
* @ipc_protocol: Pointer to ipc_protocol instance
*
* Returns: true if host can resume, false if there is a problem.
*/
bool ipc_protocol_resume(struct iosm_protocol *ipc_protocol);
/**
* ipc_protocol_pm_dev_sleep_handle - Handles the Device Sleep state change
* notification.
* @ipc_protocol: Pointer to ipc_protocol instance.
*
* Returns: true if sleep notification handled, false otherwise.
*/
bool ipc_protocol_pm_dev_sleep_handle(struct iosm_protocol *ipc_protocol);
/**
* ipc_protocol_doorbell_trigger - Wrapper for PM function which wake up the
* device if it is in low power mode
* and trigger a head pointer update interrupt.
* @ipc_protocol: Pointer to ipc_protocol instance.
* @identifier: Specifies what component triggered hpda
* update irq
*/
void ipc_protocol_doorbell_trigger(struct iosm_protocol *ipc_protocol,
u32 identifier);
/**
* ipc_protocol_sleep_notification_string - Returns last Sleep Notification as
* string.
* @ipc_protocol: Instance pointer of Protocol module.
*
* Returns: Pointer to string.
*/
const char *
ipc_protocol_sleep_notification_string(struct iosm_protocol *ipc_protocol);
/**
* ipc_protocol_init - Allocates IPC protocol instance
* @ipc_imem: Pointer to iosm_imem structure
*
* Returns: Address of IPC protocol instance on success & NULL on failure.
*/
struct iosm_protocol *ipc_protocol_init(struct iosm_imem *ipc_imem);
/**
* ipc_protocol_deinit - Deallocates IPC protocol instance
* @ipc_protocol: pointer to the IPC protocol instance
*/
void ipc_protocol_deinit(struct iosm_protocol *ipc_protocol);
#endif
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