drivers/media/video/cx18/cx18-mailbox.h

   1 /*
   2  *  cx18 mailbox functions
   3  *
   4  *  Copyright (C) 2007  Hans Verkuil <hverkuil@xs4all.nl>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19  *  02111-1307  USA
  20  */
  21
  22 #ifndef _CX18_MAILBOX_H_
  23 #define _CX18_MAILBOX_H_
  24
  25 /* mailbox max args */
  26 #define MAX_MB_ARGUMENTS 6
  27 /* compatibility, should be same as the define in cx2341x.h */
  28 #define CX2341X_MBOX_MAX_DATA 16
  29
  30 #define MB_RESERVED_HANDLE_0 0
  31 #define MB_RESERVED_HANDLE_1 0xFFFFFFFF
  32
  33 struct cx18;
  34
  35 /* The cx18_mailbox struct is the mailbox structure which is used for passing
  36    messages between processors */
  37 struct cx18_mailbox {
  38     /* The sender sets a handle in 'request' after he fills the command. The
  39        'request' should be different than 'ack'. The sender, also, generates
  40        an interrupt on XPU2YPU_irq where XPU is the sender and YPU is the
  41        receiver. */
  42     u32       request;
  43     /* The receiver detects a new command when 'req' is different than 'ack'.
  44        He sets 'ack' to the same value as 'req' to clear the command. He, also,
  45        generates an interrupt on YPU2XPU_irq where XPU is the sender and YPU
  46        is the receiver. */
  47     u32       ack;
  48     u32       reserved[6];
  49     /* 'cmd' identifies the command. The list of these commands are in
  50        cx23418.h */
  51     u32       cmd;
  52     /* Each command can have up to 6 arguments */
  53     u32       args[MAX_MB_ARGUMENTS];
  54     /* The return code can be one of the codes in the file cx23418.h. If the
  55        command is completed successfuly, the error will be ERR_SYS_SUCCESS.
  56        If it is pending, the code is ERR_SYS_PENDING. If it failed, the error
  57        code would indicate the task from which the error originated and will
  58        be one of the errors in cx23418.h. In that case, the following
  59        applies ((error & 0xff) != 0).
  60        If the command is pending, the return will be passed in a MB from the
  61        receiver to the sender. 'req' will be returned in args[0] */
  62     u32       error;
  63 };
  64
  65 int cx18_api(struct cx18 *cx, u32 cmd, int args, u32 data[]);
  66 int cx18_vapi_result(struct cx18 *cx, u32 data[MAX_MB_ARGUMENTS], u32 cmd,
  67                 int args, ...);
  68 int cx18_vapi(struct cx18 *cx, u32 cmd, int args, ...);
  69 int cx18_api_func(void *priv, u32 cmd, int in, int out,
  70                 u32 data[CX2341X_MBOX_MAX_DATA]);
  71 long cx18_mb_ack(struct cx18 *cx, const struct cx18_mailbox *mb);
  72
  73 #endif