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/* SPDX-License-Identifier: GPL-2.0-or-later */
* cx18 mailbox functions
* Copyright (C) 2007 Hans Verkuil <>
* Copyright (C) 2008 Andy Walls <>
#ifndef _CX18_MAILBOX_H_
#define _CX18_MAILBOX_H_
/* mailbox max args */
/* compatibility, should be same as the define in cx2341x.h */
#define CX2341X_MBOX_MAX_DATA 16
#define APU 0
#define CPU 1
#define EPU 2
#define HPU 3
struct cx18;
* This structure is used by CPU to provide completed MDL & buffers information.
* Its structure is dictated by the layout of the SCB, required by the
* firmware, but its definition needs to be here, instead of in cx18-scb.h,
* for mailbox work order scheduling
struct cx18_mdl_ack {
u32 id; /* ID of a completed MDL */
u32 data_used; /* Total data filled in the MDL with 'id' */
/* The cx18_mailbox struct is the mailbox structure which is used for passing
messages between processors */
struct cx18_mailbox {
/* The sender sets a handle in 'request' after he fills the command. The
'request' should be different than 'ack'. The sender, also, generates
an interrupt on XPU2YPU_irq where XPU is the sender and YPU is the
receiver. */
u32 request;
/* The receiver detects a new command when 'req' is different than 'ack'.
He sets 'ack' to the same value as 'req' to clear the command. He, also,
generates an interrupt on YPU2XPU_irq where XPU is the sender and YPU
is the receiver. */
u32 ack;
u32 reserved[6];
/* 'cmd' identifies the command. The list of these commands are in
cx23418.h */
u32 cmd;
/* Each command can have up to 6 arguments */
/* The return code can be one of the codes in the file cx23418.h. If the
command is completed successfully, the error will be ERR_SYS_SUCCESS.
If it is pending, the code is ERR_SYS_PENDING. If it failed, the error
code would indicate the task from which the error originated and will
be one of the errors in cx23418.h. In that case, the following
applies ((error & 0xff) != 0).
If the command is pending, the return will be passed in a MB from the
receiver to the sender. 'req' will be returned in args[0] */
u32 error;
struct cx18_stream;
int cx18_api(struct cx18 *cx, u32 cmd, int args, u32 data[]);
int cx18_vapi_result(struct cx18 *cx, u32 data[MAX_MB_ARGUMENTS], u32 cmd,
int args, ...);
int cx18_vapi(struct cx18 *cx, u32 cmd, int args, ...);
int cx18_api_func(void *priv, u32 cmd, int in, int out,
u32 data[CX2341X_MBOX_MAX_DATA]);
void cx18_api_epu_cmd_irq(struct cx18 *cx, int rpu);
void cx18_in_work_handler(struct work_struct *work);