source: rtems/c/src/lib/libbsp/powerpc/shared/startup/bspstart.c @ 4b39acf

/*
 *  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.
 *
 *  Modified to support the MCP750.
 *  Modifications Copyright (C) 1999 Eric Valette. valette@crf.canon.fr
 *
 *  $Id$
 */

#include <string.h>

#include <bsp.h>
#include <rtems/libio.h>
#include <rtems/libcsupport.h>
#include <rtems/bspIo.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 <libcpu/bat.h>
#include <libcpu/pte121.h>
#include <libcpu/cpuIdent.h>
#include <bsp/vectors.h>
#include <bsp/motorola.h>
#include <rtems/powerpc/powerpc.h>

extern void _return_to_ppcbug();
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();

SPR_RW(SPRG0)
SPR_RW(SPRG1)

#if defined(DEBUG_BATS)
extern void ShowBATS();`
#endif

/*
 *  Driver configuration parameters
 */
uint32_t   bsp_clicks_per_usec;

/*
 * Copy of residuals passed by firmware
 */
RESIDUAL residualCopy;
/*
 * Copy Additional boot param passed by boot loader
 */
#define MAX_LOADER_ADD_PARM 80
char loaderParam[MAX_LOADER_ADD_PARM];

char *BSP_commandline_string = loaderParam;
/*
 * Vital Board data Start using DATA RESIDUAL
 */
/*
 * Total memory using RESIDUAL DATA
 */
unsigned int BSP_mem_size;
/*
 * Where the heap starts; is used by bsp_pretasking_hook;
 */
unsigned int BSP_heap_start;
/*
 * 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;
/*
 * 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");
}

/*
 *  Use the shared implementations of the following routines
 */

void bsp_postdriver_hook(void);
void bsp_pretasking_hook(void);
void bsp_libc_init( void *, uint32_t, int );

void save_boot_params(RESIDUAL* r3, void *r4, void* r5, char *additional_boot_options)
{

  residualCopy = *r3;
  strncpy(loaderParam, additional_boot_options, MAX_LOADER_ADD_PARM);
  loaderParam[MAX_LOADER_ADD_PARM - 1] ='\0';
}

#if defined(mvme2100)
unsigned int EUMBBAR;

/* 
 * Return the current value of the Embedded Utilities Memory Block Base Address
 * Register (EUMBBAR) as read from the processor configuration register using
 * Processor Address Map B (CHRP).
 */ 
unsigned int get_eumbbar() {
  out_le32( (uint32_t*)0xfec00000, 0x80000078 );
  return in_le32( (uint32_t*)0xfee00000 );
}
#endif

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

void bsp_start( void )
{
  unsigned char *stack;
#if !defined(mvme2100)
  unsigned l2cr;
#endif
  register uint32_t  intrStack;
  register uint32_t *intrStackPtr;
  unsigned char *work_space_start;
  ppc_cpu_id_t myCpu;
  ppc_cpu_revision_t myCpuRevision;
  prep_t boardManufacturer;
  motorolaBoard myBoard;
  Triv121PgTbl  pt=0;

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

  /*
   * Init MMU block address translation to enable hardware access
   */

#if !defined(mvme2100)
  /*
   * PC legacy IO space used for inb/outb and all PC compatible hardware
   */
  setdbat(1, _IO_BASE, _IO_BASE, 0x10000000, IO_PAGE);
#endif

  /*
   * PCI devices memory area. Needed to access OpenPIC features
   * provided by the Raven
   *
   * T. Straumann: give more PCI address space
   */
  setdbat(2, PCI_MEM_BASE+PCI_MEM_WIN0, PCI_MEM_BASE+PCI_MEM_WIN0, 0x10000000, IO_PAGE);

  /*
   * Must have acces to open pic PCI ACK registers provided by the RAVEN
   */
  setdbat(3, 0xf0000000, 0xf0000000, 0x10000000, IO_PAGE);

#if defined(mvme2100)
  /* Need 0xfec00000 mapped for this */
  EUMBBAR = get_eumbbar(); 
#endif

  /*
   * 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();

#if !defined(mvme2100)
  /*
   * Enable L2 Cache. Note that the set_L2CR(L2CR) codes checks for
   * relevant CPU type (mpc750)...
   */
  l2cr = get_L2CR();
#ifdef SHOW_LCR2_REGISTER
  printk("Initial L2CR value = %x\n", l2cr);
#endif
  if ( (! (l2cr & 0x80000000)) && ((int) l2cr == -1))
    set_L2CR(0xb9A14000);
#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 later (e.g in IRQ_INIT) but it helps to understand
   * some settings below...
   */
  BSP_heap_start = ((uint32_t) __rtems_end) +
    INIT_STACK_SIZE + rtems_configuration_get_interrupt_stack_size();

  /* reserve space for the marker/tag frame */
  intrStack      = BSP_heap_start - 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(intrStack);

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

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

  select_console(CONSOLE_LOG);

  /*
   * We check that the keyboard is present and immediately
   * select the serial console if not.
   */
#if defined(BSP_KBD_IOBASE)
  { int err;
    err = kbdreset();
    if (err) select_console(CONSOLE_SERIAL);
  }
#else
  select_console(CONSOLE_SERIAL);
#endif

  boardManufacturer   =  checkPrepBoardType(&residualCopy);
  if (boardManufacturer != PREP_Motorola) {
    printk("Unsupported hardware vendor\n");
    while (1);
  }
  myBoard = getMotorolaBoard();

  printk("-----------------------------------------\n");
  printk("Welcome to %s on %s\n", _RTEMS_version,
                                    motorolaBoardToString(myBoard));
  printk("-----------------------------------------\n");
#ifdef SHOW_MORE_INIT_SETTINGS
  printk("Residuals are located at %x\n", (unsigned) &residualCopy);
  printk("Additionnal boot options are %s\n", loaderParam);
  printk("Initial system stack at %x\n",stack);
  printk("Software IRQ stack at %x\n",intrStack);
  printk("-----------------------------------------\n");
#endif

#ifdef TEST_RETURN_TO_PPCBUG
  printk("Hit <Enter> to return to PPCBUG monitor\n");
  printk("When Finished hit GO. It should print <Back from monitor>\n");
  debug_getc();
  _return_to_ppcbug();
  printk("Back from monitor\n");
  _return_to_ppcbug();
#endif /* TEST_RETURN_TO_PPCBUG  */

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

  pci_initialize();
  {
    const struct _int_map *bspmap  = motorolaIntMap(currentBoard);
    if( bspmap ) {
       printk("pci : Configuring interrupt routing for '%s'\n",
          motorolaBoardToString(currentBoard));
       FixupPCI(bspmap, motorolaIntSwizzle(currentBoard));
    }
    else
       printk("pci : Interrupt routing not available for this bsp\n");
 }

#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 return coorectly.
   */
  printk("Testing exception handling Part 2\n");
  __asm__ __volatile ("sc");

  /*
   *  Somehow doing the above seems to clobber SPRG0 on the mvme2100.  It
   *  is probably a not so subtle hint that you do not want to use PPCBug
   *  once RTEMS is up and running.  Anyway, we still needs to indicate
   *  that we have fixed PR288.  Eventually, this should go away.
   */
  _write_SPRG0(PPC_BSP_HAS_FIXED_PR288);
#endif

  BSP_mem_size            = residualCopy.TotalMemory;
  BSP_bus_frequency       = residualCopy.VitalProductData.ProcessorBusHz;
  BSP_processor_frequency = residualCopy.VitalProductData.ProcessorHz;
  BSP_time_base_divisor   = (residualCopy.VitalProductData.TimeBaseDivisor?
                    residualCopy.VitalProductData.TimeBaseDivisor : 4000);

  /* clear hostbridge errors but leave MCP disabled -
   * PCI config space scanning code will trip otherwise :-(
   */
  _BSP_clear_hostbridge_errors(0 /* enableMCP */, 0/*quiet*/);

  /* Allocate and set up the page table mappings
   * This is only available on >604 CPUs.
   *
   * NOTE: This setup routine may modify the available memory
   *       size. It is essential to call it before
   *       calculating the workspace etc.
   */
  pt = BSP_pgtbl_setup(&BSP_mem_size);

  if (!pt || TRIV121_MAP_SUCCESS != triv121PgTblMap(
            pt, TRIV121_121_VSID, 0xfeff0000, 1,
            TRIV121_ATTR_IO_PAGE, TRIV121_PP_RW_PAGE)) {
        printk("WARNING: unable to setup page tables VME "
               "bridge must share PCI space\n");
  }

  /*
   *  initialize the device driver parameters
   */
  bsp_clicks_per_usec    = BSP_bus_frequency/(BSP_time_base_divisor * 1000);

#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);
    /* finally, switch off DBAT3 */
    setdbat(3, 0, 0, 0, 0); 
  }

#if defined(DEBUG_BATS)
  ShowBATS();
#endif

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