usbout.c

一段关于带有usb下载功能的bootloader

/****************************************************************
 NAME: usbout.c
 DESC: USB bulk-OUT operation related functions
 HISTORY:
 Mar.25.2002:purnnamu: ported for S3C2410X.
 Mar.27.2002:purnnamu: DMA is enabled.
 ****************************************************************/
 
#include <string.h>
#include "option.h"
#include "2410addr.h"
#include "2410lib.h"
#include "def.h"

#include "2410usb.h"
#include "usbmain.h"
#include "usb.h"
#include "usblib.h"
#include "usbsetup.h"
#include "usbout.h"

#include "u241mon.h"


static void PrintEpoPkt(U8 *pt,int cnt);
static void RdPktEp3_CheckSum(U8 *buf,int num);



// ===================================================================
// All following commands will operate in case 
// - out_csr3 is valid.
// ===================================================================

 

#define CLR_EP3_OUT_PKT_READY() rOUT_CSR1_REG= ( out_csr3 &(~ EPO_WR_BITS)\
					&(~EPO_OUT_PKT_READY) ) 
#define SET_EP3_SEND_STALL()	rOUT_CSR1_REG= ( out_csr3 & (~EPO_WR_BITS)\
					| EPO_SEND_STALL) )
#define CLR_EP3_SENT_STALL()	rOUT_CSR1_REG= ( out_csr3 & (~EPO_WR_BITS)\
					&(~EPO_SENT_STALL) )
#define FLUSH_EP3_FIFO() 	rOUT_CSR1_REG= ( out_csr3 & (~EPO_WR_BITS)\
					|EPO_FIFO_FLUSH) )

// ***************************
// *** VERY IMPORTANT NOTE ***
// ***************************
// Prepare for the packit size constraint!!!

// EP3 = OUT end point. 

U8 ep3Buf[EP3_PKT_SIZE];
static U8 tempBuf[64+1];

void Ep3Handler(void)
{
    U8 out_csr3;
    int fifoCnt;
    rINDEX_REG=3;

    out_csr3=rOUT_CSR1_REG;
    
    DbgPrintf("<3:%x]",out_csr3);

    if(out_csr3 & EPO_OUT_PKT_READY)
    {   
    	fifoCnt=rOUT_FIFO_CNT1_REG; 
#if 0
	RdPktEp3(ep3Buf,fifoCnt);
	PrintEpoPkt(ep3Buf,fifoCnt);
#else

    	if(downloadFileSize==0)
        {
    	    RdPktEp3((U8 *)downPt,8); 	
    	    
    	    if(download_run==0)
    	    {
        	    downloadAddress=tempDownloadAddress;
            }
            else
            {
            	downloadAddress=
            		*((U8 *)(downPt+0))+
        		(*((U8 *)(downPt+1))<<8)+
        		(*((U8 *)(downPt+2))<<16)+
        		(*((U8 *)(downPt+3))<<24);
            }
            downloadFileSize=
            	*((U8 *)(downPt+4))+
        	(*((U8 *)(downPt+5))<<8)+
        	(*((U8 *)(downPt+6))<<16)+
        	(*((U8 *)(downPt+7))<<24);
            checkSum=0;
            downPt=(U8 *)downloadAddress;

    	    RdPktEp3_CheckSum((U8 *)downPt,fifoCnt-8); //The first 8-bytes are deleted.	    
    	    downPt+=fifoCnt-8;  
        	    
        	#if USBDMA
         	    //CLR_EP3_OUT_PKT_READY() is not executed. 
         	    //So, USBD may generate NAK until DMA2 is configured for USB_EP3;
         	    rINTMSK|=BIT_USBD; //for debug
          	    return;	
        	#endif	
        }
    	else
    	{
    	#if USBDMA    	
    	    Uart_Printf("<ERROR>");
    	#endif    
    	    RdPktEp3_CheckSum((U8 *)downPt,fifoCnt); 	    
    	    downPt+=fifoCnt;  //fifoCnt=64
    	}
#endif
       	CLR_EP3_OUT_PKT_READY();
	    return;
    }

    
    //I think that EPO_SENT_STALL will not be set to 1.
    if(out_csr3 & EPO_SENT_STALL)
    {   
       	DbgPrintf("[STALL]");
       	CLR_EP3_SENT_STALL();
       	return;
    }	
}



void PrintEpoPkt(U8 *pt,int cnt)
{
    int i;
    DbgPrintf("[BOUT:%d:",cnt);
    for(i=0;i<cnt;i++)
    	DbgPrintf("%x,",pt[i]);
    DbgPrintf("]");
}


void RdPktEp3_CheckSum(U8 *buf,int num)
{
    int i;
    	
    for(i=0;i<num;i++)
    {
        buf[i]=(U8)rEP3_FIFO;
        checkSum+=buf[i];
    }
}



void __irq IsrDma2(void)
{
    U8 out_csr3;
    U32 nextTotalDmaCount;
    U8 saveIndexReg=rINDEX_REG;

    rINDEX_REG=3;
    out_csr3=rOUT_CSR1_REG;
    
    ClearPending(BIT_DMA2);	    
    
    totalDmaCount+=0x80000;

    if(totalDmaCount>=downloadFileSize)// is last?
    {
    	totalDmaCount=downloadFileSize;
	
    	ConfigEp3IntMode();	

    	if(out_csr3& EPO_OUT_PKT_READY)
    	{
       	    CLR_EP3_OUT_PKT_READY();
	    }
        rINTMSK|=BIT_DMA2;  
        rINTMSK&=~(BIT_USBD);  
    }
    else
    {
    	if((totalDmaCount+0x80000)<downloadFileSize)	
    	{
    	    nextTotalDmaCount=totalDmaCount+0x80000;
    
    	    if((nextTotalDmaCount+0x80000)<downloadFileSize)
    	    {
            	//for (2~n)th autoreload.	 
        		while((rDSTAT2&0xfffff)==0); //wait until autoreload occurs.
        		rDIDST2=((U32)downloadAddress+nextTotalDmaCount-8);  
        		rDIDSTC2=(0<<1)|(0<<0);  /* dst=AHB, increase */
    	    	rDCON2=rDCON2&~(0xfffff)|(0x80000); 
    	    	
    	    	while(rEP3_DMA_TTC<0xfffff)
    	    	{
    	    	    rEP3_DMA_TTC_L=0xff;
    	    	    rEP3_DMA_TTC_M=0xff;
    	    	    rEP3_DMA_TTC_H=0xf;
    	    	    //0xfffff;
    	    	}
    	    }
    	    else
    	    {
        		while((rDSTAT2&0xfffff)==0); //wait until autoreload occurs.
    	        rDIDST2=((U32)downloadAddress+nextTotalDmaCount-8);  
    	        rDIDSTC2=(0<<1)|(0<<0);  /* dst=AHB, increase */
    	        rDCON2=rDCON2&~(0xfffff)|(downloadFileSize-nextTotalDmaCount); 		
            	while(rEP3_DMA_TTC<0xfffff)
            	{
            	    rEP3_DMA_TTC_L=0xff;
            	    rEP3_DMA_TTC_M=0xff;
            	    rEP3_DMA_TTC_H=0xf;
            	    //0xfffff;
            	}
            }
	    }
    	else
    	{
    	    while((rDSTAT2&0xfffff)==0); //wait until autoreload occurs.
      	    rDIDST2=((U32)downloadAddress+downloadFileSize-8);  //for next autoreload.	    		
      	    rDIDSTC2=(0<<1)|(0<<0); /* dst=AHB, increase */
      	    rDCON2=rDCON2&~(0xfffff)|(0); 		
    		//There is no 2nd autoreload. This will not be used.  	    
    	    	//rDMA_TX+=0x0; //USBD register		
    	}
    }
    rINDEX_REG=saveIndexReg;
}


void ClearEp3OutPktReady(void)
{
    U8 out_csr3;
    rINDEX_REG=3;
    out_csr3=rOUT_CSR1_REG;
    CLR_EP3_OUT_PKT_READY();
}