/*======================================================
*   File Name: test_s3c44b0_uart.c  
*
*   Author:gong
*
*   Email:gongyanlei@msn.com
*
*   QQ & MSN:6213599, gongyanlei@msn.com

*   Modification History: 2008-05 gong, created.
*
*   Debug History: 2008-05
*
======================================================*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>

/*44b0 sfr base address*/

#define     REGBASE     0x01c00000

/*Memory Controller Registers*/

#define     BWSCON      *(volatile unsigned int *)(REGBASE+0x080000)

/*I/O Ports Registers */

#define     PCONA       *(volatile unsigned int *)(REGBASE+0x120000)
#define     PDATA       *(volatile unsigned int *)(REGBASE+0x120004)
#define     PCONB       *(volatile unsigned int *)(REGBASE+0x120008)
#define     PDATB       *(volatile unsigned int *)(REGBASE+0x12000c)
#define     PCONC       *(volatile unsigned int *)(REGBASE+0x120010)
#define     PDATC       *(volatile unsigned int *)(REGBASE+0x120014)
#define     PUPC        *(volatile unsigned int *)(REGBASE+0x120018)
#define     PCOND       *(volatile unsigned int *)(REGBASE+0x12001c)
#define     PDATD       *(volatile unsigned int *)(REGBASE+0x120020)
#define     PUPD        *(volatile unsigned int *)(REGBASE+0x120024)
#define     PCONE       *(volatile unsigned int *)(REGBASE+0x120028)
#define     PDATE       *(volatile unsigned int *)(REGBASE+0x12002c)
#define     PUPE        *(volatile unsigned int *)(REGBASE+0x120030)
#define     PCONF       *(volatile unsigned int *)(REGBASE+0x120034)
#define     PDATF       *(volatile unsigned int *)(REGBASE+0x120038)
#define     PUPF        *(volatile unsigned int *)(REGBASE+0x12003c)
#define     PCONG       *(volatile unsigned int *)(REGBASE+0x120040)
#define     PDATG       *(volatile unsigned int *)(REGBASE+0x120044)
#define     PUPG        *(volatile unsigned int *)(REGBASE+0x120048)
#define     SPUCR       *(volatile unsigned int *)(REGBASE+0x12004c)
#define     EXTINT      *(volatile unsigned int *)(REGBASE+0x120050)
#define     EXTINPND    *(volatile unsigned int *)(REGBASE+0x120054)

/*Interrupt Controller Registers */

#define     INTCON      *(volatile unsigned int *)(REGBASE+0x200000)
#define     INTPND      *(volatile unsigned int *)(REGBASE+0x200004)
#define     INTMOD      *(volatile unsigned int *)(REGBASE+0x200008)
#define     INTMSK      *(volatile unsigned int *)(REGBASE+0x20000c)
#define     I_PSLV      *(volatile unsigned int *)(REGBASE+0x200010)
#define     I_PMST      *(volatile unsigned int *)(REGBASE+0x200014)
#define     I_CSLV      *(volatile unsigned int *)(REGBASE+0x200018)
#define     I_CMST      *(volatile unsigned int *)(REGBASE+0x20001c)
#define     I_ISPR      *(volatile unsigned int *)(REGBASE+0x200020)
#define     I_ISPC      *(volatile unsigned int *)(REGBASE+0x200024)
#define     F_ISPR      *(volatile unsigned int *)(REGBASE+0x200038)
#define     F_ISPC      *(volatile unsigned int *)(REGBASE+0x20003c)


#define BUFSIZE 100

static void config_bwscon_and_port_and_extint (void)
{
        long  temp;

    /*bus width config for fpga and s3c44b0_uart*/

    temp = BWSCON ;
    
    BWSCON = ( temp & ( ~0xFF00 ) ) | 0x4400 ;  /*nGCS3: s3c44b0_uart. 8bit mode*/
                                        	/*nGCS2: FPGA. 8bit mode*/

    /* Configuration Port Control Register*/
                									
    /* Port A */
                									
    PCONA = 0x3FF;

    /* Port B */
    
    PCONB = 0x7FF;

    /* Port C */

    PCONC = 0XFF000000;

    /* Port D */
    
    PCOND = 0x5000;
    PDATD = 0xC0;

    /* Port E */
    
    PCONE = 0x00000028;

    /* Port F */
    
    PCONF = 0x00124b2a;

    /* Port G */
    
    PCONG = 0x00000030; /*  PG2--INT750--EINT2*/

    /*INTMSK*/
    
    temp = INTMSK ;
    INTMSK = temp | 0x800064;   /*open UTXD1,URXD1,EXTINT2,I2C*/

    /* Configure s3c44b0_uart interupt*/
    
    temp = EXTINT;
    EXTINT = ( temp & ( ~0x700 ) ) | 0x100 ;
}
             
int main(void)
{
        int     fd = 0 ;
    int i = 0 ;
    int     count = 0 ;
    int j;
    
        unsigned char   buf[BUFSIZE];
    
    PDATD = 0xc0;

    printf("start to test the driver for s3c44b0_uart.\n\n");

        printf("configure arm......");
       
    config_bwscon_and_port_and_extint();

    printf("done!\n\n");

    printf("open s3c44b0_uart......");
    		
    fd = open("/dev/s3c44b0_uart", O_RDWR | O_NOCTTY | O_NDELAY);
    
    if ( fd  < 0)
    {
            printf("Error in open s3c44b0_uart\n");
    		
            exit(-1); 
        }
    
    printf("done\n\n");

    PDATD = 0x00;
    
    while(1)
    {	
        PDATD = 0x80;

        count= read( fd , buf, sizeof(buf) );
        //count = 0;

        if( count != 0 )
    	{
            PDATD |= 0x40;

            printf("The test program read %d character via s3c44b0_uart, they are:.\n", count );
    		
            for ( i = 0 ; i < count ; i ++ )
    		{
                printf( "0x%x" , buf[i] );
                printf("%d\n", i);
                for (j = 0; j < 1000; j++);
    		}
    		
            printf("\n\n");


            for(i = 0 ; i < 1000 ; i ++)
    		{
        		i++;
    		}

            printf("The test program is sending back to host via s3c44b0_uart......", count );
    		
            i=write( fd , buf , count );

            printf("done\n");

            printf("%d character send via s3c44b0_uart, Please check.\n\n", count );

            PDATD &= (~0x40);
    	}
        printf("shat!\n");

        PDATD = 0x00;
    }
    
    close(fd);
    
        return 0;
}