addi_eeprom.c

最新版comedi的源码

| Function   Name   : VOID v_EepromWaitBusy                                  |

|			(WORD	w_PCIBoardEepromAddress)                    	 |

+----------------------------------------------------------------------------+

| Task              : Wait the busy flag from PCI controller                 |

+----------------------------------------------------------------------------+

| Input Parameters  : WORD w_PCIBoardEepromAddress : PCI eeprom base address |

+----------------------------------------------------------------------------+

| Output Parameters : -                                                      |

+----------------------------------------------------------------------------+

| Return Value      : -                                                      |

+----------------------------------------------------------------------------+

*/



VOID	v_EepromWaitBusy(WORD	w_PCIBoardEepromAddress)

	{

	BYTE b_EepromBusy = 0;



	do

	  {

	   /*************/

	   /* IMPORTANT */

	   /*************/



	   /************************************************************************/

	   /* An error has been written in the AMCC 5933 book at the page B-13*/
 	 
           /* Ex: if you read a byte and look for the busy statusEEPROM=0x80 and   */
 
 	   /*      the operator register is AMCC_OP_REG_MCSR+3*/
 
	   /*      WORD read  EEPROM=0x8000 andAMCC_OP_REG_MCSR+2 		   */
 	 
           /*      DWORD read  EEPROM=0x80000000 and AMCC_OP_REG_MCSR */
 	  
           /************************************************************************/
 
 
       	   b_EepromBusy = inb(w_PCIBoardEepromAddress + 0x3F);             
	   b_EepromBusy = b_EepromBusy &0x80;

 	 }
 	while(b_EepromBusy == 0x80);
 


	}






/*

+---------------------------------------------------------------------------------+

| Function   Name   : VOID v_EepromClock76(DWORD dw_Address,                      |

|					   DWORD dw_RegisterValue)                 			  |

+---------------------------------------------------------------------------------+

| Task              : This function sends the clocking sequence to the EEPROM.    |

+---------------------------------------------------------------------------------+

| Input Parameters  : DWORD dw_Address : PCI eeprom base address                  |

|		      DWORD dw_RegisterValue : PCI eeprom register value to write.|

+---------------------------------------------------------------------------------+

| Output Parameters : -                                                           |

+---------------------------------------------------------------------------------+

| Return Value      : -                                                           |

+---------------------------------------------------------------------------------+

*/



VOID v_EepromClock76(DWORD dw_Address,DWORD dw_RegisterValue)

   {



   /************************/

   /* Set EEPROM clock Low */

   /************************/

  
outl(dw_RegisterValue & 0x6,dw_Address);

   /***************/

   /* Wait 0.1 ms */

   /***************/


    udelay(100);
   

   /*************************/

   /* Set EEPROM clock High */

   /*************************/


  outl(dw_RegisterValue | 0x1,dw_Address);


   /***************/

   /* Wait 0.1 ms */

   /***************/


   udelay(100);

   }



/*

+---------------------------------------------------------------------------------+

| Function   Name   : VOID v_EepromSendCommand76(DWORD dw_Address,                |

|					   DWORD   dw_EepromCommand,                		  |

|					   BYTE    b_DataLengthInBits)                        |

+---------------------------------------------------------------------------------+

| Task              : This function sends a Command to the EEPROM 93C76.          |

+---------------------------------------------------------------------------------+

| Input Parameters  : DWORD dw_Address : PCI eeprom base address                  |

|		      DWORD dw_EepromCommand : PCI eeprom command to write.       |

|		      BYTE  b_DataLengthInBits : PCI eeprom command data length.  |

+---------------------------------------------------------------------------------+

| Output Parameters : -                                                           |

+---------------------------------------------------------------------------------+

| Return Value      : -                                                           |

+---------------------------------------------------------------------------------+

*/



VOID v_EepromSendCommand76(DWORD dw_Address,DWORD   dw_EepromCommand,BYTE    b_DataLengthInBits)

   {

   CHAR  c_BitPos = 0;

   DWORD dw_RegisterValue = 0;



 

   /*****************************/

   /* Enable EEPROM Chip Select */

   /*****************************/

   dw_RegisterValue = 0x2;



   /********************************************************************/

   /* Toggle EEPROM's Chip select to get it out of Shift Register Mode */

   /********************************************************************/

   outl(dw_RegisterValue,dw_Address);

 


   /***************/

   /* Wait 0.1 ms */

   /***************/

  
udelay(100);
 
   

   /*******************************************/

   /* Send EEPROM command - one bit at a time */

   /*******************************************/
   

   for (c_BitPos = (b_DataLengthInBits - 1); c_BitPos >= 0; c_BitPos--)

      {


      /**********************************/

      /* Check if current bit is 0 or 1 */

      /**********************************/


      if (dw_EepromCommand & (1 << c_BitPos))

	 {

	 /***********/

	 /* Write 1 */

	 /***********/



	 dw_RegisterValue = dw_RegisterValue | 0x4;

	 }

      else

	 {

	 /***********/

	 /* Write 0 */

	 /***********/



	 dw_RegisterValue = dw_RegisterValue & 0x3;

	 }



      /*********************/

      /* Write the command */

      /*********************/


      outl(dw_RegisterValue,dw_Address);
  


      /***************/

      /* Wait 0.1 ms */

      /***************/

   
  udelay(100);
  
   

      /****************************/

      /* Trigger the EEPROM clock */

      /****************************/

      v_EepromClock76(dw_Address, dw_RegisterValue);


      }



   }



/*

+---------------------------------------------------------------------------------+

| Function   Name   : VOID v_EepromCs76Read(DWORD dw_Address,                     |

|					   WORD    w_offset,                      			  |

|					   PWORD   pw_Value)                      			  |

+---------------------------------------------------------------------------------+

| Task              : This function read a value from the EEPROM 93C76.           |

+---------------------------------------------------------------------------------+

| Input Parameters  : DWORD dw_Address : PCI eeprom base address                  |

|		      WORD    w_offset : Offset of the adress to read             |

|		      PWORD   pw_Value : PCI eeprom 16 bit read value.            |

+---------------------------------------------------------------------------------+

| Output Parameters : -                                                           |

+---------------------------------------------------------------------------------+

| Return Value      : -                                                           |

+---------------------------------------------------------------------------------+

*/



VOID v_EepromCs76Read(DWORD dw_Address,WORD    w_offset,
PWORD   pw_Value)

   {

   CHAR   c_BitPos = 0;

   DWORD  dw_RegisterValue = 0;

   DWORD  dw_RegisterValueRead = 0;





   /*************************************************/

   /* Send EEPROM read command and offset to EEPROM */

   /*************************************************/

   v_EepromSendCommand76(dw_Address, (EE_READ << 4) | (w_offset / 2), EE76_CMD_LEN);



   /*******************************/

   /* Get the last register value */

   /*******************************/

   dw_RegisterValue = (((w_offset / 2) & 0x1) << 2) | 0x2;

   

   /*****************************/

   /* Set the 16-bit value of 0 */

   /*****************************/


   *pw_Value = 0;



   /************************/

   /* Get the 16-bit value */

   /************************/

   for (c_BitPos = 0; c_BitPos < 16; c_BitPos++)

      {


      /****************************/

      /* Trigger the EEPROM clock */

      /****************************/