dma.c

it is a sample code for s3c2410 board.

#include "4510addr.h"
#include "dma.h"

int uart_tx_gdma_finish = 0;
int uart_rx_gdma_finish = 0;

/*************************************************
* enable GDMA0
**************************************************/
void EnableGDMA0(void)
{
	uart_tx_gdma_finish = 0;
	GDMA0_RUN_ENABLE = 1;
}

/*************************************************
* enable GDMA1 
**************************************************/
void EnableGDMA1(void)
{
	uart_rx_gdma_finish = 0;
	GDMA1_RUN_ENABLE = 1;
}

/*************************************************
* GDMA0 transmit setting
* mode = MEM to UART
**************************************************/
void GDMA0_TX(char *buf, int len)
{
	GDMACON0 = GDMA_INT_ENABLE | GDMA_U0MODE | GDMA_MEM2UART | GDMA_DST_FIX | GDMA_TX_BYTE;
	GDMASRC0 = (unsigned long)(void*)buf;
	GDMACNT0 = len;
}

/*************************************************
* GDMA1 receive setting
* mode = UART to MEM
**************************************************/
void GDMA1_RX(char *buf, int len)
{
	GDMACON1 = GDMA_INT_ENABLE | GDMA_U0MODE | GDMA_SRC_FIX | GDMA_TX_BYTE;
	GDMADST1 = (unsigned long)(void*)buf;
	GDMACNT1 = len;
}


/*************************************************
* DMA0 interrupt handler
**************************************************/
void UART_TX_DMA(void)
{
	uart_tx_gdma_finish = 1;
	ClearPending(BIT_GDMA0);	
}

/*************************************************
* DMA1 interrupt handler
**************************************************/
void UART_RX_DMA(void)
{
	uart_rx_gdma_finish = 1;
	ClearPending(BIT_GDMA1);	
}

/*************************************************
* chack DMA Rx is finish
**************************************************/
int UART_RX_DMA_Finish(void)
{
	return uart_rx_gdma_finish;
}

/*************************************************
* check DMA Tx is finish
**************************************************/
int UART_TX_DMA_Finish(void)
{
	return uart_tx_gdma_finish;
}