/*
  Copyright (c), 2004-2005,2007-2010 Trident Microsystems, Inc.
  All rights reserved.

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  modification, are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright notice,
    this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright notice,
    this list of conditions and the following disclaimer in the documentation
	and/or other materials provided with the distribution.
  * Neither the name of Trident Microsystems nor Hauppauge Computer Works
    nor the names of its contributors may be used to endorse or promote
	products derived from this software without specific prior written
	permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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*/

/*******************************************************************************
* FILENAME: $Id: drx_dap_fasi.h,v 1.5 2009/07/07 14:21:40 justin Exp $
*
* DESCRIPTION:
* Part of DRX driver.
* Data access protocol: Fast Access Sequential Interface (fasi)
* Fast access, because of short addressing format (16 instead of 32 bits addr)
* Sequential, because of I2C.
*
* USAGE:
* Include.
*
* NOTES:
*
*
*******************************************************************************/

/*-------- compilation control switches --------------------------------------*/

#ifndef __DRX_DAP_FASI_H__
#define __DRX_DAP_FASI_H__

/*-------- Required includes -------------------------------------------------*/

#include "drx_driver.h"

/*-------- Defines, configuring the API --------------------------------------*/

/********************************************
* Allowed address formats
********************************************/

/*
* Comments about short/long addressing format:
*
* The DAP FASI offers long address format (4 bytes) and short address format
* (2 bytes). The DAP can operate in 3 modes:
* (1) only short
* (2) only long
* (3) both long and short but short preferred and long only when necessary
*
* These modes must be selected compile time via compile switches.
* Compile switch settings for the different modes:
* (1) DRXDAPFASI_LONG_ADDR_ALLOWED=0, DRXDAPFASI_SHORT_ADDR_ALLOWED=1
* (2) DRXDAPFASI_LONG_ADDR_ALLOWED=1, DRXDAPFASI_SHORT_ADDR_ALLOWED=0
* (3) DRXDAPFASI_LONG_ADDR_ALLOWED=1, DRXDAPFASI_SHORT_ADDR_ALLOWED=1
*
* The default setting will be (3) both long and short.
* The default setting will need no compile switches.
* The default setting must be overridden if compile switches are already
* defined.
*
*/

/* set default */
#if !defined(DRXDAPFASI_LONG_ADDR_ALLOWED)
#define  DRXDAPFASI_LONG_ADDR_ALLOWED 1
#endif

/* set default */
#if !defined(DRXDAPFASI_SHORT_ADDR_ALLOWED)
#define  DRXDAPFASI_SHORT_ADDR_ALLOWED 1
#endif

/* check */
#if ((DRXDAPFASI_LONG_ADDR_ALLOWED == 0) && \
      (DRXDAPFASI_SHORT_ADDR_ALLOWED == 0))
#error  At least one of short- or long-addressing format must be allowed.
*;				/* illegal statement to force compiler error */
#endif

/********************************************
* Single/master multi master setting
********************************************/
/*
* Comments about SINGLE MASTER/MULTI MASTER  modes:
*
* Consider the two sides:1) the master and 2)the slave.
*
* Master:
* Single/multimaster operation set via DRXDAP_SINGLE_MASTER compile switch
*  + single master mode means no use of repeated starts
*  + multi master mode means use of repeated starts
*  Default is single master.
*  Default can be overridden by setting the compile switch DRXDAP_SINGLE_MASTER.
*
* Slave:
* Single/multi master selected via the flags in the FASI protocol.
*  + single master means remember memory address between i2c packets
*  + multimaster means flush memory address between i2c packets
*  Default is single master, DAP FASI changes multi-master setting silently
*  into single master setting. This cannot be overridden.
*
*/
/* set default */
#ifndef DRXDAP_SINGLE_MASTER
#define DRXDAP_SINGLE_MASTER 0
#endif

/********************************************
* Chunk/mode checking
********************************************/
/*
* Comments about DRXDAP_MAX_WCHUNKSIZE in single or multi master mode and
* in combination with short and long addressing format. All text below
* assumes long addressing format. The table also includes information
* for short ADDRessing format.
*
* In single master mode, data can be written by sending the register address
* first, then two or four bytes of data in the next packet.
* Because the device address plus a register address equals five bytes,
* the minimum chunk size must be five.
* If ten-bit I2C device addresses are used, the minimum chunk size must be six,
* because the I2C device address will then occupy two bytes when writing.
*
* Data in single master mode is transferred as follows:
* <S> <devW>  a0  a1  a2  a3  <P>
* <S> <devW>  d0  d1 [d2  d3] <P>
* ..
* or
* ..
* <S> <devW>  a0  a1  a2  a3  <P>
* <S> <devR> --- <P>
*
* In multi-master mode, the data must immediately follow the address (an I2C
* stop resets the internal address), and hence the minimum chunk size is
* 1 <I2C address> + 4 (register address) + 2 (data to send) = 7 bytes (8 if
* 10-bit I2C device addresses are used).
*
* The 7-bit or 10-bit i2c address parameters is a runtime parameter.
* The other parameters can be limited via compile time switches.
*
*-------------------------------------------------------------------------------
*
*  Minimum chunk size table (in bytes):
*
*       +----------------+----------------+
*       | 7b i2c addr    | 10b i2c addr   |
*       +----------------+----------------+
*       | single | multi | single | multi |
* ------+--------+-------+--------+-------+
* short | 3      | 5     | 4      | 6     |
* long  | 5      | 7     | 6      | 8     |
* ------+--------+-------+--------+-------+
*
*/

/* set default */
#if !defined(DRXDAP_MAX_WCHUNKSIZE)
#define  DRXDAP_MAX_WCHUNKSIZE 254
#endif

/* check */
#if ((DRXDAPFASI_LONG_ADDR_ALLOWED == 0) && (DRXDAPFASI_SHORT_ADDR_ALLOWED == 1))
#if DRXDAP_SINGLE_MASTER
#define  DRXDAP_MAX_WCHUNKSIZE_MIN 3
#else
#define  DRXDAP_MAX_WCHUNKSIZE_MIN 5
#endif
#else
#if DRXDAP_SINGLE_MASTER
#define  DRXDAP_MAX_WCHUNKSIZE_MIN 5
#else
#define  DRXDAP_MAX_WCHUNKSIZE_MIN 7
#endif
#endif

#if  DRXDAP_MAX_WCHUNKSIZE <  DRXDAP_MAX_WCHUNKSIZE_MIN
#if ((DRXDAPFASI_LONG_ADDR_ALLOWED == 0) && (DRXDAPFASI_SHORT_ADDR_ALLOWED == 1))
#if DRXDAP_SINGLE_MASTER
#error  DRXDAP_MAX_WCHUNKSIZE must be at least 3 in single master mode
*;				/* illegal statement to force compiler error */
#else
#error  DRXDAP_MAX_WCHUNKSIZE must be at least 5 in multi master mode
*;				/* illegal statement to force compiler error */
#endif
#else
#if DRXDAP_SINGLE_MASTER
#error  DRXDAP_MAX_WCHUNKSIZE must be at least 5 in single master mode
*;				/* illegal statement to force compiler error */
#else
#error  DRXDAP_MAX_WCHUNKSIZE must be at least 7 in multi master mode
*;				/* illegal statement to force compiler error */
#endif
#endif
#endif

/* set default */
#if !defined(DRXDAP_MAX_RCHUNKSIZE)
#define  DRXDAP_MAX_RCHUNKSIZE 254
#endif

/* check */
#if  DRXDAP_MAX_RCHUNKSIZE < 2
#error  DRXDAP_MAX_RCHUNKSIZE must be at least 2
*;				/* illegal statement to force compiler error */
#endif

/* check */
#if  DRXDAP_MAX_RCHUNKSIZE & 1
#error  DRXDAP_MAX_RCHUNKSIZE must be even
*;				/* illegal statement to force compiler error */
#endif

/*-------- Public API functions ----------------------------------------------*/

#define DRXDAP_FASI_RMW           0x10000000
#define DRXDAP_FASI_BROADCAST     0x20000000
#define DRXDAP_FASI_CLEARCRC      0x80000000
#define DRXDAP_FASI_SINGLE_MASTER 0xC0000000
#define DRXDAP_FASI_MULTI_MASTER  0x40000000
#define DRXDAP_FASI_SMM_SWITCH    0x40000000	/* single/multi master switch */
#define DRXDAP_FASI_MODEFLAGS     0xC0000000
#define DRXDAP_FASI_FLAGS         0xF0000000

#define DRXDAP_FASI_ADDR2BLOCK(addr)  (((addr)>>22)&0x3F)
#define DRXDAP_FASI_ADDR2BANK(addr)   (((addr)>>16)&0x3F)
#define DRXDAP_FASI_ADDR2OFFSET(addr) ((addr)&0x7FFF)

#define DRXDAP_FASI_SHORT_FORMAT(addr)     (((addr) & 0xFC30FF80) == 0)
#define DRXDAP_FASI_LONG_FORMAT(addr)      (((addr) & 0xFC30FF80) != 0)
#define DRXDAP_FASI_OFFSET_TOO_LARGE(addr) (((addr) & 0x00008000) != 0)

#endif				/* __DRX_DAP_FASI_H__ */