source: rtems/c/src/lib/libbsp/powerpc/ep1a/startup/bspstart.c @ 6ea100c1

/*
 *  This routine starts the application.  It includes application,
 *  board, and monitor specific initialization and configuration.
 *  The generic CPU dependent initialization has been performed
 *  before this routine is invoked.
 *
 *  COPYRIGHT (c) 1989-2007.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id$
 */

#include <string.h>

#include <rtems/libio.h>
#include <rtems/libcsupport.h>
#include <bsp/consoleIo.h>
#include <libcpu/spr.h>
#include <bsp/residual.h>
#include <bsp/pci.h>
#include <bsp/openpic.h>
#include <bsp/irq.h>
#include <bsp/VME.h>
#include <bsp.h>
#include <libcpu/bat.h>
#include <libcpu/pte121.h>
#include <libcpu/cpuIdent.h>
#include <bsp/vectors.h>
#include <rtems/powerpc/powerpc.h>

extern unsigned long __rtems_end[];
extern void L1_caches_enables();
extern unsigned get_L2CR();
extern void set_L2CR(unsigned);
extern void bsp_cleanup(void);
extern Triv121PgTbl BSP_pgtbl_setup();
extern void BSP_pgtbl_activate();
extern void BSP_vme_config();
extern void ShowBATS();
unsigned int rsPMCQ1Init();

uint32_t bsp_clicks_per_usec;

SPR_RW(SPRG0)
SPR_RW(SPRG1)

uint8_t LightIdx = 0;

void BSP_Increment_Light(){
  uint8_t data;
  data = *GENERAL_REGISTER1;
  data &= 0xf0;
  data |= LightIdx++;
  *GENERAL_REGISTER1 = data;
}

void BSP_Fatal_Fault_Light() {
  uint8_t data;
  data = *GENERAL_REGISTER1;
  data &= 0xf0;
  data |= 0x7;
  while(1)
    *GENERAL_REGISTER1 = data;
}

void write_to_Q2ram(int offset, unsigned int data )
{
printk("0x%x ==> %d\n", offset, data );
#if 0
  unsigned int *ptr = 0x82000000;
  ptr += offset;
  *ptr = data;
#endif
}

/*
 * Vital Board data Start using DATA RESIDUAL
 */

uint32_t VME_Slot1 = FALSE;

/*
 * Total memory.
 * Note: RAM_END is defined in linkcmds.  We want to verify that the application
 *       is only using 10M of memory, and we do this by only accounting for this
 *       much memory.
 */
extern int   RAM_END;  
unsigned int BSP_mem_size = (unsigned int)&RAM_END;

/*
 * PCI Bus Frequency
 */
unsigned int BSP_bus_frequency; 

/*
 * processor clock frequency
 */
unsigned int BSP_processor_frequency;

/*
 * Time base divisior (how many tick for 1 second).
 */
unsigned int BSP_time_base_divisor = 1000;  /* XXX - Just a guess */

/*
 * system init stack 
 */
#define INIT_STACK_SIZE 0x1000

void BSP_panic(char *s)
{
  printk("%s PANIC %s\n",_RTEMS_version, s);
  __asm__ __volatile ("sc"); 
}

void _BSP_Fatal_error(unsigned int v)
{
  printk("%s PANIC ERROR %x\n",_RTEMS_version, v);
  __asm__ __volatile ("sc"); 
}
 
int BSP_FLASH_Disable_writes(
  uint32_t    area
)
{
  unsigned char    data;
  
  data = *GENERAL_REGISTER1;
  data |= DISABLE_USER_FLASH;
  *GENERAL_REGISTER1 = data;
                                                                            
  return RTEMS_SUCCESSFUL;
}

int BSP_FLASH_Enable_writes(
 uint32_t               area                           /* IN  */
)
{
  unsigned char    data;
                                                                                                                        
  data = *GENERAL_REGISTER1;
  data &= (~DISABLE_USER_FLASH);
  *GENERAL_REGISTER1 = data;
                                                                                                                        
  return RTEMS_SUCCESSFUL;
}

void BSP_FLASH_set_page(
  uint8_t  page
)
{
  unsigned char  data;
                                                                                                                        
  /* Set the flash page register. */
  data = *GENERAL_REGISTER2;
  data &= ~(BSP_FLASH_PAGE_MASK);
  data |= 0x80 | (page << BSP_FLASH_PAGE_SHIFT);
  *GENERAL_REGISTER2 = data;
}

/*
 *  Use the shared implementations of the following routines
 */
 
void bsp_libc_init( void *, uint32_t, int );

/*
 *  Function:   bsp_pretasking_hook
 *  Created:    95/03/10
 *
 *  Description:
 *      BSP pretasking hook.  Called just before drivers are initialized.
 *      Used to setup libc and install any BSP extensions.
 *
 *  NOTES:
 *      Must not use libc (to do io) from here, since drivers are
 *      not yet initialized.
 *
 */
 
void bsp_pretasking_hook(void)
{
  uint32_t        heap_start;    
  uint32_t        heap_size;
  uint32_t        heap_sbrk_spared;

  extern uint32_t _bsp_sbrk_init(uint32_t, uint32_t*);
  
  heap_start = ((uint32_t) __rtems_end) +
    INIT_STACK_SIZE + rtems_configuration_get_interrupt_stack_size();
  if (heap_start & (CPU_ALIGNMENT-1))
    heap_start = (heap_start + CPU_ALIGNMENT) & ~(CPU_ALIGNMENT-1);

  heap_size = (BSP_mem_size - heap_start) - rtems_configuration_get_work_space_size();

  heap_sbrk_spared=_bsp_sbrk_init(heap_start, &heap_size);

#ifdef SHOW_MORE_INIT_SETTINGS
  printk(" HEAP start %x  size %x (%x bytes spared for sbrk)\n", 
    heap_start, heap_size, heap_sbrk_spared);
#endif    

  bsp_libc_init((void *) 0, heap_size, heap_sbrk_spared);
  rsPMCQ1Init();

#ifdef RTEMS_DEBUG
  rtems_debug_enable( RTEMS_DEBUG_ALL_MASK );
#endif
}

void zero_bss()
{
  /* prevent these from being accessed in the short data areas */
  extern unsigned long __bss_start[], __SBSS_START__[], __SBSS_END__[];
  extern unsigned long __SBSS2_START__[], __SBSS2_END__[];
  memset(__SBSS_START__, 0, ((unsigned) __SBSS_END__) - ((unsigned)__SBSS_START__));
  memset(__SBSS2_START__, 0, ((unsigned) __SBSS2_END__) - ((unsigned)__SBSS2_START__));
  memset(__bss_start, 0, ((unsigned) __rtems_end) - ((unsigned)__bss_start));
}

void save_boot_params(RESIDUAL* r3, void *r4, void* r5, char *additional_boot_options)
{
#if 0  
  residualCopy = *r3;
  strncpy(loaderParam, additional_boot_options, MAX_LOADER_ADD_PARM);
  loaderParam[MAX_LOADER_ADD_PARM - 1] ='\0';
#endif
}

unsigned int EUMBBAR;

unsigned int get_eumbbar() {
  register int a, e;

  asm volatile( "lis %0,0xfec0; ori  %0,%0,0x0000": "=r" (a) );
  asm volatile("sync");
                                                                
  asm volatile("lis %0,0x8000; ori %0,%0,0x0078": "=r"(e) ); 
  asm volatile("stwbrx  %0,0x0,%1": "=r"(e): "r"(a));  
  asm volatile("sync");

  asm volatile("lis %0,0xfee0; ori %0,%0,0x0000": "=r" (a) ); 
  asm volatile("sync");
                                                         
  asm volatile("lwbrx %0,0x0,%1": "=r" (e): "r" (a));
  asm volatile("isync");
  return e;
}

void Read_ep1a_config_registers( ppc_cpu_id_t myCpu ) {
  unsigned char value;

  /*
   * Print out the board and revision.
   */

  printk("Board:  ");
  printk( get_ppc_cpu_type_name(myCpu) );

  value = *BOARD_REVISION_REGISTER2 & HARDWARE_ID_MASK;
  if ( value == HARDWARE_ID_PPC5_EP1A )
    printk("  EP1A     ");
  else if ( value == HARDWARE_ID_EP1B ) 
    printk("  EP1B     ");
  else
    printk("  Unknown  ");
 
  value = *BOARD_REVISION_REGISTER2&0x1; 
  printk("Board ID %08x", value);
  if(value == 0x0){
    VME_Slot1 = TRUE;
    printk("VME Slot 1\n");
  }
  else{
    VME_Slot1 = FALSE;
    printk("\n");
  }

  printk("Revision: ");
  value = *BOARD_REVISION_REGISTER1;
  printk("%d%c\n\n", value>>4, 'A'+(value&BUILD_REVISION_MASK) );

  /*
   * Get the CPU, XXX frequency
   */
  value = *EQUIPMENT_PRESENT_REGISTER2 & PLL_CFG_MASK;
  switch( value ) {
    case MHZ_33_66_200:     /* PCI, MEM, & CPU Frequency */
      BSP_processor_frequency = 200000000;
      BSP_bus_frequency       =  33000000;
      break;
    case MHZ_33_100_200:   /* PCI, MEM, & CPU Frequency */
      BSP_processor_frequency = 200000000;
      BSP_bus_frequency       =  33000000;
      break;
    case MHZ_33_66_266:    /* PCI, MEM, & CPU Frequency */
      BSP_processor_frequency = 266000000;
      BSP_bus_frequency       =  33000000;
      break;
    case MHZ_33_66_333:   /* PCI, MEM, & CPU Frequency */
      BSP_processor_frequency = 333000000;
      BSP_bus_frequency       =  33000000;
      break;
    case MHZ_33_100_333:   /* PCI, MEM, & CPU Frequency */
      BSP_processor_frequency = 333000000;
      BSP_bus_frequency       =  33000000;
      break;
    case MHZ_33_100_350:   /* PCI, MEM, & CPU Frequency */
      BSP_processor_frequency = 350000000;
      BSP_bus_frequency       =  33000000;
      break;
    default:
      printk("ERROR: Unknown Processor frequency 0x%02x please fill in bspstart.c\n",value);
      BSP_processor_frequency = 350000000;
      BSP_bus_frequency       =  33000000;
      break;
  }
}

/*
 *  bsp_start
 *
 *  This routine does the bulk of the system initialization.
 */

void bsp_start( void )
{
  unsigned char *stack;
  register uint32_t  intrStack;
  register uint32_t *intrStackPtr;
  unsigned char *work_space_start;
  ppc_cpu_id_t myCpu;
  ppc_cpu_revision_t myCpuRevision;
  Triv121PgTbl  pt=0;   /*  R = e; */

  /*
   * Get CPU identification dynamically. Note that the get_ppc_cpu_type() function
   * store the result in global variables so that it can be used latter...
   */
  BSP_Increment_Light();
  myCpu         = get_ppc_cpu_type();
  myCpuRevision = get_ppc_cpu_revision();

  EUMBBAR = get_eumbbar(); 
  printk("EUMBBAR 0x%08x\n", EUMBBAR );

  /* 
   * Note this sets BSP_processor_frequency based upon register settings.
   * It must be done prior to setting up hooks.
   */
  Read_ep1a_config_registers( myCpu );

  bsp_clicks_per_usec = BSP_processor_frequency/(BSP_time_base_divisor * 1000);

ShowBATS();
#if 0   /* XXX - Add back in cache enable when we get this up and running!! */
  /*
   * enables L1 Cache. Note that the L1_caches_enables() codes checks for
   * relevant CPU type so that the reason why there is no use of myCpu...
   */
  L1_caches_enables();
#endif

  /*
   * the initial stack  has aready been set to this value in start.S
   * so there is no need to set it in r1 again... It is just for info
   * so that It can be printed without accessing R1.
   */
  stack = ((unsigned char*) __rtems_end) + INIT_STACK_SIZE - PPC_MINIMUM_STACK_FRAME_SIZE;

 /* tag the bottom (T. Straumann 6/36/2001 <strauman@slac.stanford.edu>) */
  *((uint32_t *)stack) = 0;

  /*
   * Initialize the interrupt related settings
   * SPRG1 = software managed IRQ stack
   *
   * This could be done latter (e.g in IRQ_INIT) but it helps to understand
   * some settings below...
   */
  intrStack = ((uint32_t) __rtems_end) +
    INIT_STACK_SIZE + rtems_configuration_get_interrupt_stack_size() - 
    PPC_MINIMUM_STACK_FRAME_SIZE;

  /* make sure it's properly aligned */
  intrStack &= ~(CPU_STACK_ALIGNMENT-1);

  /* tag the bottom (T. Straumann 6/36/2001 <strauman@slac.stanford.edu>) */
  intrStackPtr = (uint32_t*) intrStack;
  *intrStackPtr = 0;

  _write_SPRG1((unsigned int)intrStack);

  /* signal them that we have fixed PR288 - eventually, this should go away */
  _write_SPRG0(PPC_BSP_HAS_FIXED_PR288);

  /*
   * Initialize default raw exception hanlders. See vectors/vectors_init.c
   */
  initialize_exceptions();

  /*
   * Init MMU block address translation to enable hardware
   * access
   */
  setdbat(1, 0xf0000000, 0xf0000000, 0x10000000, IO_PAGE);
  setdbat(3, 0x90000000, 0x90000000, 0x10000000, IO_PAGE);


#ifdef SHOW_MORE_INIT_SETTINGS
  printk("Going to start PCI buses scanning and initialization\n");
#endif  
  pci_initialize();

#ifdef SHOW_MORE_INIT_SETTINGS
  printk("Number of PCI buses found is : %d\n", pci_bus_count());
#endif
#ifdef TEST_RAW_EXCEPTION_CODE  
  printk("Testing exception handling Part 1\n");

  /*
   * Cause a software exception
   */
  __asm__ __volatile ("sc");

  /*
   * Check we can still catch exceptions and returned coorectly.
   */
  printk("Testing exception handling Part 2\n");
  __asm__ __volatile ("sc");
#endif  

#ifdef SHOW_MORE_INIT_SETTINGS
  printk("rtems_configuration_get_work_space_size() = %x\n", 
     rtems_configuration_get_work_space_size());
#endif  
  work_space_start = 
    (unsigned char *)BSP_mem_size - rtems_configuration_get_work_space_size();

  if ( work_space_start <= ((unsigned char *)__rtems_end) + 
        INIT_STACK_SIZE + rtems_configuration_get_interrupt_stack_size()) {
    printk( "bspstart: Not enough RAM!!!\n" );
    bsp_cleanup();
  }

  Configuration.work_space_start = work_space_start;

  /*
   * Initalize RTEMS IRQ system
   */
  BSP_rtems_irq_mng_init(0);
  
  /* Activate the page table mappings only after
   * initializing interrupts because the irq_mng_init()
   * routine needs to modify the text
   */           
  if (pt) {
#ifdef  SHOW_MORE_INIT_SETTINGS
    printk("Page table setup finished; will activate it NOW...\n");
#endif
    BSP_pgtbl_activate(pt);
  }

  /*
   * Initialize VME bridge - needs working PCI
   * and IRQ subsystems...
   */
#ifdef SHOW_MORE_INIT_SETTINGS
  printk("Going to initialize VME bridge\n");
#endif
  /* VME initialization is in a separate file so apps which don't use
   * VME or want a different configuration may link against a customized
   * routine.
   */
  BSP_vme_config();

#ifdef SHOW_MORE_INIT_SETTINGS
  ShowBATS();
  printk("Exit from bspstart\n");
#endif  
}