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

#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <paths.h>
#include <stdlib.h>

#include <sys/sysctl.h>
#include <sys/time.h>

#define ETH_SDMA_CONFIG_REG(port)           (MV_ETH_REG_BASE(port) + 0x41c)
#define MV_ETH_REG_BASE(port)      	(((port) == 0) ? 0x72000 : 0x82000)
#define ETH_RX_INTR_COAL_OFFSET             7
#define ETH_RX_INTR_COAL_ALL_MASK           (0x3fff<<ETH_RX_INTR_COAL_OFFSET)
#define ETH_RX_INTR_COAL_MASK(value)        (((value)<<ETH_RX_INTR_COAL_OFFSET)  \
                                             & ETH_RX_INTR_COAL_ALL_MASK)

#define ETH_TX_FIFO_URGENT_THRESH_REG(port) (MV_ETH_REG_BASE(port) + 0x474)
#define ETH_TX_INTR_COAL_OFFSET             4


mv_reg_read(unsigned int reg)
{
    unsigned int value;
    FILE *resource_dump;

    resource_dump = fopen ("/proc/resource_dump" , "w");
    if (!resource_dump) {
      printf ("Eror opening file /proc/resource_dump\n");
      exit(-1);
    }
    fprintf (resource_dump,"register  r %08x",reg);
    fclose (resource_dump);
    resource_dump = fopen ("/proc/resource_dump" , "r");
    if (!resource_dump) {
      printf ("Eror opening file /proc/resource_dump\n");
      exit(-1);
    }
    fscanf (resource_dump , "%x" , &value);
    fclose (resource_dump);

    return value;
}

void
mv_reg_write(unsigned int reg, unsigned int value)
{
    FILE *resource_dump;

    resource_dump = fopen ("/proc/resource_dump" , "w");
    if (!resource_dump) {
      printf ("Eror opening file /proc/resource_dump\n");
      exit(-1);
    }
    fprintf (resource_dump,"register  w %08x %08x",reg,value);
    fclose (resource_dump);
    return;
}

/*******************************************************************************
* mvEthRxCoalSet  - Sets coalescing interrupt mechanism on RX path
*
* DESCRIPTION:
*       This routine sets the RX coalescing interrupt mechanism parameter.
*       This parameter is a timeout counter, that counts in 64 tClk
*       chunks, that when timeout event occurs a maskable interrupt occurs.
*       The parameter is calculated using the tCLK frequency of the
*       MV-64xxx chip, and the required number is in micro seconds.
*
* INPUT:
*       MV_U32          uSec        - Number of micro seconds between 
*                                   RX interrupts
*
* RETURN:
*       None.
*
* COMMENT:     
*   1 sec           - TCLK_RATE clocks
*   1 uSec          - TCLK_RATE / 1,000,000 clocks
*
*   Register Value for N micro seconds -  ((N * ( (TCLK_RATE / 1,000,000)) / 64)
*
* RETURN:
*       None.
*
*******************************************************************************/
unsigned int    mvEthRxCoalSet (unsigned int uSec) 
{ 
    unsigned int	  port = 0;
    unsigned int 	  Tclk = 166000000;
    unsigned int          coal = ((uSec * ( Tclk / 1000000)) / 64);
    unsigned int          portSdmaCfgReg;

    portSdmaCfgReg =  mv_reg_read(ETH_SDMA_CONFIG_REG(port));
    portSdmaCfgReg &= ~ETH_RX_INTR_COAL_ALL_MASK;
    portSdmaCfgReg |= (ETH_RX_INTR_COAL_MASK(coal));
    mv_reg_write(ETH_SDMA_CONFIG_REG(port), portSdmaCfgReg);
    return coal;
}

/*******************************************************************************
* mvEthTxCoalSet - Sets coalescing interrupt mechanism on TX path
*
* DESCRIPTION:
*       This routine sets the TX coalescing interrupt mechanism parameter.
*       This parameter is a timeout counter, that counts in 64 tClk
*       chunks, that when timeout event occurs a maskable interrupt
*       occurs.
*       The parameter is calculated using the tCLK frequency of the
*       MV-64xxx chip, and the required number is in micro seconds.
*
* INPUT:
*       MV_U32          uSec        - Number of micro seconds between 
*                                   RX interrupts
*
* RETURN:
*       None.
*
* COMMENT:     
*   1 sec           - TCLK_RATE clocks
*   1 uSec          - TCLK_RATE / 1,000,000 clocks
*
*   Register Value for N micro seconds -  ((N * ( (TCLK_RATE / 1,000,000)) / 64)
*
*******************************************************************************/
unsigned int    mvEthTxCoalSet(unsigned int uSec) 
{
    unsigned int          port = 0;
    unsigned int          Tclk = 166000000;
    unsigned int          coal = ((uSec * (Tclk / 1000000)) / 64);

    /* Set TX Coalescing mechanism */
    mv_reg_write (ETH_TX_FIFO_URGENT_THRESH_REG(port), 
                  (coal << ETH_TX_INTR_COAL_OFFSET));
    return coal;
}

int
main(int argc, char **argv)
{
        unsigned int direct,usec;

        if (argc == 3) {
                sscanf(argv[1], "%x", &direct);
                sscanf(argv[2], "%x", &usec);
        }else{ printf ("Usage: mv_set_coal <direction 0-Rx 1-Tx> <coal in micro sec>\n");
                return 0;
        }

        if(direct == 0)
		mvEthRxCoalSet(usec);		
	else
		mvEthTxCoalSet(usec);

        return 1;
}