ata.c

Cirrus Logic EP7312处理器部分控制程序。

//****************************************************************************
//
// ATA.C - Routines read and write data to an ATAPI device.  
//
// Copyright (c) 2001 Cirrus Logic, Inc.
//
//****************************************************************************
#include "ep7312.h"
#include "lib7312.h"
#include "ata.h"

//
// see ATASimpleRegPacket()
//
unsigned char reg_atapi_reg_fr;  
unsigned char reg_atapi_reg_sc;  
unsigned char reg_atapi_reg_sn;  
unsigned char reg_atapi_reg_dh;  

//
// Global defines
//
REGCMDINFO reg_cmd_info;

//****************************************************************************
//                                                                         
//  Function Name: ATAInitializeInterface
//
//  Function Description: Initializes the EP7312 to perform accesses to the 
//                        ATA interface.
//
//****************************************************************************
void ATAInitializeInterface(void)
{
   unsigned long * volatile ulRegister = (unsigned long *)(HwBaseAddress + 
                                                           HwMemConfig2);
   
   //
   // Clear out the value of chip select 5 (bits 8-15) in the MemConfigReg2.
   //
   *ulRegister &= 0xFFFF00FF;

   //
   // Configure the EP7312's chip select for 8-bit bus width, 1 wait state for
   // random accesses, and 0 wait states for sequential accesses. 
   //
   *ulRegister |= 0x0000BE00;
}
 
//****************************************************************************
//                                                                   
//  Function Name: ATAReadCommandRegister	
//
//  Function Description: Reads an 8-bit value from an ATA command register.
//
//***************************************************************************
unsigned char ATAReadCommandRegister(unsigned char ucRegister)
{
   unsigned char * volatile pucRegister = (unsigned char *)(ATACommandBaseAddress +
                                                ucRegister);
   unsigned char ucData;   

   // 
   // Read and the return the contents of the register.
   //
   ucData = *pucRegister;

   //
   // SerialSendString("\rRead command register ");
   //
   return(ucData);
}

//***************************************************************************
// 
//  Function Name: ATAWriteCommandRegister
//
//  Function Description: Writes an 8-bit value to an ATA command register.
//
//***************************************************************************
void ATAWriteCommandRegister(unsigned char ucRegister, unsigned char ucData)
{
 
   unsigned char * volatile pucRegister = (unsigned char *)(ATACommandBaseAddress + 
                                                  ucRegister);

   // 
   // Write to the register.
   //
   *pucRegister = ucData;

   return;
}

//***************************************************************************
//   
//  Function Name: ATAReadControlRegister	
//
//  Function Description: Reads an 8-bit value from an ATA control register.
//
//***************************************************************************
unsigned char ATAReadControlRegister(unsigned char ucRegister)
{
   unsigned char * volatile pucRegister = (unsigned char *)(ATAControlBaseAddress +
                                                ucRegister);
   unsigned char ucData;

   // 
   // Read and the return the contents of the register.
   //
   ucData = *pucRegister;

   return(ucData);
}

//***************************************************************************
// 
//  Function Name: ATAWriteControlRegister
//	
//  Function Description: Writes an 8-bit value to an ATA control register.
//	
//***************************************************************************
void ATAWriteControlRegister(unsigned char ucRegister, unsigned char ucData)
{
   unsigned char * volatile pucRegister = (unsigned char *)(ATAControlBaseAddress + 
                                                  ucRegister);

   // 
   // Write to the register.
   //
   *pucRegister = ucData;

   return;
}

//***************************************************************************
// 
//  Function Name: ATAReadDataRegister
//	
//  Function Description: Reads 16-bit values from the ATA data register.
//
//***************************************************************************
unsigned long ATAReadDataRegister(unsigned short *pusBuffer, unsigned long ulCount)
{
   unsigned short * volatile pusRegister = (unsigned short *)(ATACommandBaseAddress + 
                                                  DATAREGISTER);
   unsigned long * volatile pulRegister = (unsigned long *)(HwBaseAddress +
                                                HwMemConfig2);
   unsigned long ulTempCount = 0;
   unsigned short winzips_temp = 0;		
   unsigned short status;			
   unsigned long ulTemp;

   //
   // Save the configuration for the ATA interface's chip select.
   //
   ulTemp = *pulRegister;
 
   // 
   // Read in the number of words specified by the ulCount parameter.
   //

   //
   // Wait for the DRQ bit in the ATA Status register to be set.
   //
   while(!(ATAReadCommandRegister(STATUSREGISTER) & ATADRQ));
 
   //
   // Configure the ATA interface's chip select to perform 16-bit accesses. 
   //
   *pulRegister &= 0xfffffcff;
   *pulRegister |= 0x00000100;

   while((ulTempCount<ulCount) && (ATAReadCommandRegister(STATUSREGISTER) & ATADRQ))
   {
       // 
       // Read in the data and increment the pointer.
       //
       *pusBuffer = *pusRegister;
       winzips_temp = *pusBuffer;
       pusBuffer++;

       //
       // Increment the count.
       //
       ulTempCount++;

       status = ATAReadCommandRegister(STATUSREGISTER);
      
   }

   //
   // Restore the chip select configuration.
   //
   *pulRegister = ulTemp;

   status = ATAReadCommandRegister(STATUSREGISTER);
   return(ulTempCount);
} 

//***************************************************************************
//   
//  Function Name: ATAWriteDataRegister
//	
//  Function Description: Writes 16-bit values to the ATA data register. 
//
//***************************************************************************
unsigned long ATAWriteDataRegister(unsigned short *pusBuffer, unsigned long ulCount)
{
   unsigned short * volatile pusRegister = (unsigned short *)(ATACommandBaseAddress + 
                                                  DATAREGISTER);
   unsigned long * volatile pulRegister = (unsigned long *)(HwBaseAddress +
                                                HwMemConfig2);
   unsigned long ulTempCount = 0;
   unsigned long ulTemp;
   unsigned short temp = 0;		

 
   //
   //Save the configuration for the ATA interface's chip select.
   //
   ulTemp = *pulRegister;
 
   //
   // Read in the number of words specified by the ulCount parameter.
   //

   //
   // Wait for the DRQ bit in the ATA Status register to be set.
   //
   while(!(ATAReadCommandRegister(STATUSREGISTER) & ATADRQ));
 
   //
   // Configure the ATA interface's chip select to perform 16-bit accesses. 
   //
   *pulRegister &= 0xfffffcff;
   *pulRegister |= 0x00000100;

   //
   // (ATAReadCommandRegister(STATUSREGISTER) & ATADRQ))
   //
   while (ulTempCount<ulCount) 
   {
      
       //
       // Read in the data and increment the pointer.
       //
       temp = *pusBuffer;
       *pusRegister = *pusBuffer;				
       pusBuffer++;

       //
       // Increment the count.
       //
       ulTempCount++;

   }

   //
   // Restore the chip select configuration.
   //
   *pulRegister = ulTemp;

   return(ulTempCount);
}

//***************************************************************************
//  
//  Function Name: ATASelectDevice	
//
//  Function Description: Must be called before any command is issued.
//
//***************************************************************************
void ATASelectDevice (int DeviceNumber)
{
   // 
   // Wait until BSY=0 and DRQ=0
   //
   while(ATAReadCommandRegister(STATUSREGISTER) & (ATABSY | ATADRQ));

   if(DeviceNumber == 0)
	ATAWriteCommandRegister(DEVICEHEADREGISTER, DEVICEHEAD_DEV0);
   else
	ATAWriteCommandRegister(DEVICEHEADREGISTER, DEVICEHEAD_DEV1);

   // 
   // Wait until BSY=0 and DRQ=0
   //
   while(ATAReadCommandRegister(STATUSREGISTER) & (ATABSY | ATADRQ));

return;
}

//*********************************************************************
// 
// Function Name: ATASoftReset
// 
// Function Description: Function perform an ATA soft reset sequence. 
// 
//*********************************************************************

void ATASoftReset(void)
{
   unsigned long ulIndex;

   //
   // Check for a clear BSY bit in the status register.
   //
   for(ulIndex=0;ulIndex<74000;ulIndex++);
   
   while(ATAReadCommandRegister(STATUSREGISTER) & ATABSY);

   //
   // Perform the reset.
   //
   ATAWriteControlRegister(DEVICECONTROLREGISTER, 0x06);

   for(ulIndex=0;ulIndex<500;ulIndex++);

   ATAWriteControlRegister(DEVICECONTROLREGISTER, 0x02);

   //
   // Wait for the soft reset to complete.
   //
   for(ulIndex=0;ulIndex<74000;ulIndex++);

   while(ATAReadCommandRegister(STATUSREGISTER) & (ATABSY | ATADRDY));
}

//************************************************************************
// 
// Function Name: ATADeviceReset
// 
// Function Description: Function performs an ATA device reset command.
// 
//************************************************************************
void ATADeviceReset(unsigned char ucDevice)
{
   while(ATAReadCommandRegister(STATUSREGISTER) & (ATABSY | ATADRQ));

   //
   // Select the device that is to be reset.
   //
   if(ucDevice == DEVICE0)
      ATAWriteCommandRegister(DEVICEHEADREGISTER, DEVICE0);
   else
      ATAWriteCommandRegister(DEVICEHEADREGISTER, DEVICE1);  
  
   //
   // Write the ATA Device Reset to the Command Register.
   //
   ATAWriteCommandRegister(COMMANDREGISTER, 0x08);
  
   //
   // Wait until the command is complete.
   //
   while(ATAReadCommandRegister(STATUSREGISTER) & ATABSY);
}

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