ssd_cfm_clk.h

motorola 针对coldfire 5275 评估板的Dbug bootloader源程序

/*************************************************************************
 *           Copyright (C) 2003 by Motorola.  All rights reserved.       *
 *************************************************************************
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 *************************************************************************
 *                                                                       *
 *               Standard Software CFM Driver for ColdFire               *
 *                                                                       *
 * FILE NAME     :  ssd_cfm_clk.h                                        *
 * DATE          :  May 22, 2003                                         *
 *                                                                       *
 * AUTHOR        :  Flash Team, GSG China                                *
 * E-mail        :  [e-mail]                                *
 *                                                                       *
 *************************************************************************/

/******************************* CHANGES  *********************************
 1.00   5.22.2003       Morrison Yang            Initial Version
 *************************************************************************/

#ifndef _SSD_CFM_CLK_H_
#define _SSD_CFM_CLK_H_

/*************************************************************************
    This head file helps user to calculate clock divider at compile time.
    User should provide SYS_CLK before including this file.
    
    The unit for clock rate value is in KHz. For example if the real clock 
    rate is 10 MHz, then the the clock rate value will be 10000.
    
**************************************************************************/
    
/*************************************************************************
    Macros for Calculating Clock Divider Value
 *************************************************************************/

/* Mininum and maximum system clock to CFM */
#define MIN_SYS_CLK                         900        /* 900 KHz */
#define MAX_SYS_CLK                         204800     /* 204.8 MHz */

/* User needs to define system clock */
#ifndef SYS_CLK

    #error "SYS_CLK (system clock frequency in KHz) is not defined!"

#endif

#if (SYS_CLK > MAX_SYS_CLK) || (SYS_CLK < MIN_SYS_CLK)

    #error "System clock frequency is out of range!"

#endif

#define FLASH_INPUT_CLOCK_RATE              (SYS_CLK / 2)

#if  FLASH_INPUT_CLOCK_RATE > 12800

    #define FLASH_CLOCK                     (FLASH_INPUT_CLOCK_RATE / 8)
    #define FLASH_CLOCK_PRDIV8              0x40
    
#else

    #define FLASH_CLOCK                     FLASH_INPUT_CLOCK_RATE
    #define FLASH_CLOCK_PRDIV8              0

#endif

#define CLOCK_DIV                           (FLASH_CLOCK / 200)
    
#if (FLASH_CLOCK % 200)

    #define FLASH_CLOCK_DIV                 CLOCK_DIV

#else

    #define FLASH_CLOCK_DIV                 (CLOCK_DIV - 1)

#endif

/*user code refer to this macro directly*/
#define FLASH_CLOCK_DIVIDER                 (FLASH_CLOCK_PRDIV8 | FLASH_CLOCK_DIV)

#endif // _SSD_CFM_CLK_H_