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/*--------------------------------------------------------------------

 * TITLE: Plasma DDR Initialization

 * AUTHOR: Steve Rhoads (rhoadss@yahoo.com)

 * DATE CREATED: 12/17/05

 * FILENAME: ddr_init.c

 * PROJECT: Plasma CPU core

 * COPYRIGHT: Software placed into the public domain by the author.

 *    Software 'as is' without warranty.  Author liable for nothing.

 * DESCRIPTION:

 *    Plasma DDR Initialization

 *--------------------------------------------------------------------*/

#define DDR_BASE 0x10000000

#define MemoryRead(A) (*(volatile int*)(A))

#define MemoryWrite(A,V) *(volatile int*)(A)=(V)

extern void putchar(int value);

extern int puts(const char *string);

extern void print_hex(unsigned long num);

//SD_A  <= address_reg(25 downto 13);  --address row

//SD_BA <= address_reg(12 downto 11);  --bank_address

//cmd   := address_reg(6 downto 4);    --bits RAS & CAS & WE

int DdrInitData[] = {

// AddressLines    Bank        Command

   (0x000 << 13) | (0 << 11) | (7 << 4),  //CKE=1; NOP="111"

   (0x400 << 13) | (0 << 11) | (2 << 4),  //A10=1; PRECHARGE ALL="010"

#ifndef DLL_DISABLE

   (0x000 << 13) | (1 << 11) | (0 << 4),  //enable DLL; BA="01"; LMR="000"

#else

   (0x001 << 13) | (1 << 11) | (0 << 4),  //disable DLL; BA="01"; LMR="000"

#endif

   (0x121 << 13) | (0 << 11) | (0 << 4),  //reset DLL, CL=2, BL=2; LMR="000"

   (0x400 << 13) | (0 << 11) | (2 << 4),  //A10=1; PRECHARGE ALL="010" 

   (0x000 << 13) | (0 << 11) | (1 << 4),  //AUTO REFRESH="001"

   (0x000 << 13) | (0 << 11) | (1 << 4),  //AUTO REFRESH="001

   (0x021 << 13) | (0 << 11) | (0 << 4)   //clear DLL, CL=2, BL=2; LMR="000"

};

int DdrInit(void)

{

   int i, j, k=0;

   for(i = 0; i < sizeof(DdrInitData)/sizeof(int); ++i)

   {

      MemoryWrite(DDR_BASE + DdrInitData[i], 0);

      for(j = 0; j < 4; ++j)

         ++k;

   }

   for(j = 0; j < 100; ++j)

      ++k;

   k += MemoryRead(DDR_BASE);  //Enable DDR

   return k;

}

#ifdef DDR_TEST_MAIN

int main()

{

   volatile int *ptr = (int*)DDR_BASE;

   int i;

   DdrInit();

   ptr[0] = 0x12345678;

   if(ptr[0] != 0x12345678)

      putchar('X');

   for(i = 0; i < 10; ++i)

   {

      ptr[i] = i;

   }

   for(i = 0; i < 10; ++i)

   {

      if(ptr[i] != i)

         putchar('A' + i);

   }

   *(unsigned char*)DDR_BASE = 0x23;

   *(unsigned char*)(DDR_BASE+1) = 0x45;

   *(unsigned char*)(DDR_BASE+2) = 0x67;

   *(unsigned char*)(DDR_BASE+3) = 0x89;

   if(ptr[0] != 0x23456789)

      putchar('Y');

   puts("\r\ndone\r\n");

   return 0;

}

#endif