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52fcb3ecc6
Add a Memory Descriptor List (MDL) layer to buffer handling to implement scatter-gather I/O. Currently there is still only 1 buffer per MDL. Signed-off-by: Andy Walls <awalls@radix.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
101 lines
3.6 KiB
C
101 lines
3.6 KiB
C
/*
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* cx18 mailbox functions
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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* Copyright (C) 2008 Andy Walls <awalls@radix.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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#ifndef _CX18_MAILBOX_H_
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#define _CX18_MAILBOX_H_
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/* mailbox max args */
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#define MAX_MB_ARGUMENTS 6
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/* compatibility, should be same as the define in cx2341x.h */
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#define CX2341X_MBOX_MAX_DATA 16
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#define MB_RESERVED_HANDLE_0 0
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#define MB_RESERVED_HANDLE_1 0xFFFFFFFF
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#define APU 0
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#define CPU 1
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#define EPU 2
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#define HPU 3
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struct cx18;
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/*
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* This structure is used by CPU to provide completed MDL & buffers information.
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* Its structure is dictated by the layout of the SCB, required by the
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* firmware, but its defintion needs to be here, instead of in cx18-scb.h,
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* for mailbox work order scheduling
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*/
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struct cx18_mdl_ack {
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u32 id; /* ID of a completed MDL */
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u32 data_used; /* Total data filled in the MDL with 'id' */
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};
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/* The cx18_mailbox struct is the mailbox structure which is used for passing
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messages between processors */
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struct cx18_mailbox {
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/* The sender sets a handle in 'request' after he fills the command. The
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'request' should be different than 'ack'. The sender, also, generates
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an interrupt on XPU2YPU_irq where XPU is the sender and YPU is the
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receiver. */
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u32 request;
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/* The receiver detects a new command when 'req' is different than 'ack'.
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He sets 'ack' to the same value as 'req' to clear the command. He, also,
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generates an interrupt on YPU2XPU_irq where XPU is the sender and YPU
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is the receiver. */
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u32 ack;
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u32 reserved[6];
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/* 'cmd' identifies the command. The list of these commands are in
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cx23418.h */
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u32 cmd;
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/* Each command can have up to 6 arguments */
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u32 args[MAX_MB_ARGUMENTS];
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/* The return code can be one of the codes in the file cx23418.h. If the
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command is completed successfuly, the error will be ERR_SYS_SUCCESS.
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If it is pending, the code is ERR_SYS_PENDING. If it failed, the error
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code would indicate the task from which the error originated and will
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be one of the errors in cx23418.h. In that case, the following
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applies ((error & 0xff) != 0).
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If the command is pending, the return will be passed in a MB from the
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receiver to the sender. 'req' will be returned in args[0] */
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u32 error;
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};
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struct cx18_stream;
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struct cx18_api_func_private {
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struct cx18 *cx;
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struct cx18_stream *s;
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};
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int cx18_api(struct cx18 *cx, u32 cmd, int args, u32 data[]);
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int cx18_vapi_result(struct cx18 *cx, u32 data[MAX_MB_ARGUMENTS], u32 cmd,
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int args, ...);
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int cx18_vapi(struct cx18 *cx, u32 cmd, int args, ...);
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int cx18_api_func(void *priv, u32 cmd, int in, int out,
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u32 data[CX2341X_MBOX_MAX_DATA]);
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void cx18_api_epu_cmd_irq(struct cx18 *cx, int rpu);
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void cx18_in_work_handler(struct work_struct *work);
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#endif
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