/*
 * (C) Copyright 2000
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <config.h>
#include <mpc824x.h>
#include <ppcboot.h>
#include <command.h>

int checkcpu(long clock)
{
  unsigned int pvr = get_pvr();
  unsigned int version = pvr >>16;
  unsigned int revision = pvr &0xffff;
  char buf[32];

  switch(version)
  {
    case CPU_TYPE_8240:
      printf("MPC8240");
      break;

    case CPU_TYPE_8245:
      printf("MPC8245");
      break;

    default:
      return -1; /*not valid for this source*/
  }

  switch(revision)
  {
    default: /*currently no info on revision numbers*/
      printf(" Revision %d.%d",revision>>8, revision & 0xff);
  }

  printf(" at %s MHz:", strmhz(buf, clock));

  printf(" %u kB I-Cache", checkicache() >> 10);
  printf(" %u kB D-Cache", checkdcache() >> 10);

  printf("\n");

  return 0;
}

/* ------------------------------------------------------------------------- */
/* L1 i-cache                                                                */

int checkicache(void)
{
    /*TODO*/
  return 128*4*32;
};
/* ------------------------------------------------------------------------- */
/* L1 d-cache                                                                */

int checkdcache(void)
{
    /*TODO*/
  return 128*4*32;

};

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

int do_reset (cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
{
	ulong msr, addr;

	/* Interrupts and MMU off */
	__asm__ ("mtspr    81, 0" );

	/* Interrupts and MMU off */
	__asm__ __volatile__ ("mfmsr    %0" : "=r"(msr) : );
	msr &= ~0x1030;
	__asm__ __volatile__ ("mtmsr    %0" : : "r"(msr) );

	/*
	 * Trying to execute the next instruction at a non-existing address
	 * should cause a machine check, resulting in reset
	 */
#ifdef CFG_RESET_ADDRESS
	addr = CFG_RESET_ADDRESS;
#else
	/*
	 * note: when CFG_MONITOR_BASE points to a RAM address, CFG_MONITOR_BASE
	 * - sizeof (ulong) is usually a valid address. Better pick an address
	 * known to be invalid on your system and assign it to CFG_RESET_ADDRESS.
	 * "(ulong)-1" used to be a good choice for many systems...
	 */
	addr = CFG_MONITOR_BASE - sizeof (ulong);
#endif
	((void (*)(void ))addr)();
	return 1; 

}

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

/*
 * Get timebase clock frequency (like cpu_clk in Hz)
 * This is the sys_logic_clk (memory bus) divided by 4
 */
unsigned long get_tbclk (void)
{
	return ((get_bus_freq(0) + 2L) / 4L);
}

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

/*
 * The MPC824x has an integrated PCI controller known as the MPC107.
 * The following are MPC107 Bridge Controller and PCI Support functions
 *
 */

/*
 *  This procedure reads a 32-bit address MPC107 register, and returns   
 *  a 32 bit value.  It swaps the address to little endian before        
 *  writing it to config address, and swaps the value to big endian      
 *  before returning to the caller.     
 */
unsigned int
mpc824x_mpc107_getreg(unsigned int regNum)
{
  unsigned int temp;
  /* swap the addr. to little endian */
  *(volatile unsigned int *)CHRP_REG_ADDR = PCISWAP(regNum);
  temp = *(volatile unsigned int *)CHRP_REG_DATA;
  return PCISWAP(temp);		      /* swap the data upon return */
}

/*
 *  This procedure writes a 32-bit address MPC107 register.  It swaps
 *  the address to little endian before writing it to config address.     
 */

void
mpc824x_mpc107_setreg(unsigned int regNum, unsigned int regVal)
{
    /* swap the addr. to little endian */
    *(volatile unsigned int *)CHRP_REG_ADDR = PCISWAP(regNum);
    *(volatile unsigned int *)CHRP_REG_DATA = PCISWAP(regVal);
    return;
}


/*
 *  Write a byte (8 bits) to a memory location.
 */
void
mpc824x_mpc107_write8(unsigned int addr, unsigned char data)
{
  *(unsigned char*)addr = data;
  __asm__("sync");
}
/*
 *  Write a word (16 bits) to a memory location after the value
 *  has been byte swapped (big to little endian or vice versa)    
 */

void
mpc824x_mpc107_write16(unsigned int address, unsigned short data)
{
  *(volatile unsigned short *)address = BYTE_SWAP_16_BIT(data);  
  __asm__("sync");
}                                                

/*
 *  Write a long word (32 bits) to a memory location after the value
 *  has been byte swapped (big to little endian or vice versa)      
 */

void
mpc824x_mpc107_write32(unsigned int address, unsigned int data)
{
  *(volatile unsigned int *)address = LONGSWAP(data); 
  __asm__("sync");
}                                                

/*
 *  Read a byte (8 bits) from a memory location.
 */
unsigned char
mpc824x_mpc107_read8(unsigned int addr)
{
  return *(volatile unsigned char*)addr;
}


/*
 *  Read a word (16 bits) from a memory location, and byte swap the 
 *  value before returning to the caller.
 */
unsigned short
mpc824x_mpc107_read16(unsigned int address)
{
  unsigned short retVal;
  retVal = BYTE_SWAP_16_BIT(*(unsigned short*)address);
  return retVal;
}


/*
 *  Read a long word (32 bits) from a memory location, and byte 
 *  swap the value before returning to the caller.     
 */
unsigned int
mpc824x_mpc107_read32(unsigned int address)
{
    unsigned int retVal;
    retVal = LONGSWAP(*(unsigned int *)address);
    return (retVal);
}


/*
 *  Read a register in the Embedded Utilities Memory Block address
 *  space.  
 *  Input: regNum - register number + utility base address.  Example, 
 *         the base address of EPIC is 0x40000, the register number
 *	   being passed is 0x40000+the address of the target register.
 *	   (See epic.h for register addresses).
 *  Output:  The 32 bit little endian value of the register.
 */

unsigned int
mpc824x_eummbar_read(unsigned int regNum)
{
    unsigned int temp;
    temp = *(volatile unsigned int *) (EUMBBAR_VAL + regNum) ;
    temp = PCISWAP(temp);
    return temp;
}

	
/*
 *  Write a value to a register in the Embedded Utilities Memory 
 *  Block address space.
 *  Input: regNum - register number + utility base address.  Example, 
 *                  the base address of EPIC is 0x40000, the register 
 *	            number is 0x40000+the address of the target register.
 *	            (See epic.h for register addresses).
 *         regVal - value to be written to the register.
 */

void
mpc824x_eummbar_write(unsigned int regNum, unsigned int regVal)
{
    *(volatile unsigned int *) (EUMBBAR_VAL + regNum) = PCISWAP(regVal);
    return;
}

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