board/ppmc7xx/ppmc7xx.c

   1 /*
   2  * ppmc7xx.c
   3  * ---------
   4  *
   5  * Main board-specific routines for Wind River PPMC 7xx/74xx board.
   6  *
   7  * By Richard Danter (richard.danter@windriver.com)
   8  * Copyright (C) 2005 Wind River Systems
   9  */
  10
  11 #include <common.h>
  12 #include <command.h>
  13
  14
  15 /* Define some MPC107 (memory controller) registers */
  16 #define MPC107_EUMB_GCR         0xfce41020
  17 #define MPC107_EUMB_IACKR       0xfce600a0
  18
  19
  20 /* Function prototypes */
  21 extern void unlock_ram_in_cache( void );
  22 extern void _start_warm(void);
  23
  24
  25 /*
  26  * initdram()
  27  *
  28  * This function normally initialises the (S)DRAM of the system. For this board
  29  * the SDRAM was already initialised by board_asm_init (see init.S) so we just
  30  * return the size of RAM.
  31  */
  32 long initdram( int board_type )
  33 {
  34     return CFG_SDRAM_SIZE;
  35 }
  36
  37
  38 /*
  39  * after_reloc()
  40  *
  41  * This is called after U-Boot has been copied from Flash/ROM to RAM. It gives
  42  * us an opportunity to do some additional setup before the rest of the system
  43  * is initialised. We don't need to do anything, so we just call board_init_r()
  44  * which should never return.
  45  */
  46 void after_reloc( ulong dest_addr, gd_t* gd )
  47 {
  48         /* Jump to the main U-Boot board init code */
  49         board_init_r( gd, dest_addr );
  50 }
  51
  52
  53 /*
  54  * checkboard()
  55  *
  56  * We could do some board level checks here, such as working out what version
  57  * it is, but for this board we simply display it's name (on the console).
  58  */
  59 int checkboard( void )
  60 {
  61     puts( "Board: Wind River PPMC 7xx/74xx\n" );
  62     return 0;
  63 }
  64
  65
  66 /*
  67  * misc_init_r
  68  *
  69  * Used for other setup which needs to be done late in the bring-up phase.
  70  */
  71 int misc_init_r( void )
  72 {
  73         /* Reset the EPIC and clear pending interrupts */
  74         out32r(MPC107_EUMB_GCR, 0xa0000000);
  75         while( in32r( MPC107_EUMB_GCR ) & 0x80000000 );
  76         out32r( MPC107_EUMB_GCR, 0x20000000 );
  77         while( in32r( MPC107_EUMB_IACKR ) != 0xff );
  78
  79         /* Enable the I-Cache */
  80         icache_enable();
  81
  82         return 0;
  83 }
  84
  85
  86 /*
  87  * do_reset()
  88  *
  89  * Shell command to reset the board.
  90  */
  91 void do_reset( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[] )
  92 {
  93         printf( "Resetting...\n" );
  94
  95         /* Disabe and invalidate cache */
  96         icache_disable();
  97         dcache_disable();
  98
  99         /* Jump to warm start (in RAM) */
 100         _start_warm();
 101
 102         /* Should never get here */
 103         while(1);
 104 }