source: rtems/c/src/lib/libbsp/powerpc/mvme3100/startup/bspstart.c @ a884df3

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

/*
 *  COPYRIGHT (c) 1989-1998.
 *  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.org/license/LICENSE.
 *
 *  Modified to support the MCP750.
 *  Modifications Copyright (C) 1999 Eric Valette. valette@crf.canon.fr
 *
 *  Modified for mvme3100 by T. Straumann
 */

#include <string.h>
#include <stdlib.h>
#include <inttypes.h>

#include <rtems.h>
#include <bsp.h>
#include <bsp/bootcard.h>
#include <rtems/bspIo.h>
#include <rtems/counter.h>
#include <libcpu/spr.h>
#include <libcpu/io.h>
#include <libcpu/e500_mmu.h>
#include <bsp/uart.h>
#include <bsp/irq.h>
#include <bsp/pci.h>
#include <bsp/vpd.h>
#include <libcpu/cpuIdent.h>
#include <bsp/vectors.h>
#include <rtems/powerpc/powerpc.h>

#define SHOW_MORE_INIT_SETTINGS
#undef  DEBUG

#define NumberOf(arr) (sizeof(arr)/sizeof(arr[0]))

#ifdef  DEBUG
#define STATIC
#else
#define STATIC static
#endif

extern unsigned long __rtems_end[];
extern unsigned      ppc_exc_lock_std, ppc_exc_gpr3_std;

/*
 * Copy Additional boot param passed by boot loader
 */
#define CMDLINE_BUF_SIZE  2048

static char cmdline_buf[CMDLINE_BUF_SIZE] = {0};
char *BSP_commandline_string         = cmdline_buf;

/*
 * Vital Board data Start using DATA RESIDUAL
 */
uint32_t bsp_clicks_per_usec         = 0;
/*
 * Total memory using RESIDUAL DATA
 */
unsigned int BSP_mem_size            = 0;
/*
 * PCI Bus Frequency
 */
unsigned int BSP_pci_bus_frequency   = 0xdeadbeef;
/*
 * PPC Bus Frequency
 */
unsigned int BSP_bus_frequency       = 0;
/*
 * processor clock frequency
 */
unsigned int BSP_processor_frequency = 0;
/*
 * Time base divisior (how many tick for 1 second).
 */
unsigned int BSP_time_base_divisor   = 8000; /* if external RTC clock unused (HID0) */

/* Board identification string */
char BSP_productIdent[20]            = {0};
char BSP_serialNumber[20]            = {0};

/* VPD appends an extra char -- what for ? */
char BSP_enetAddr0[7]                = {0};
char BSP_enetAddr1[7]                = {0};
char BSP_enetAddr2[7]                = {0};

static void
prether(char *b, int idx)
{
int i;
  printk("Ethernet %i                  %02X", idx, *b++);
  for ( i=0; i<5; i++ )
    printk(":%02X",*b++);
  printk("\n");
}

BSP_output_char_function_type     BSP_output_char = BSP_output_char_via_serial;
BSP_polling_getchar_function_type BSP_poll_char = NULL;

char *rtems_progname;

/*
 *  Use the shared implementations of the following routines
 */
char *save_boot_params(
  void *r3,
  void *r4,
  void *r5,
  char *cmdline_start,
  char *cmdline_end
)
{

  strncpy(cmdline_buf, cmdline_start, CMDLINE_BUF_SIZE);
  cmdline_buf[CMDLINE_BUF_SIZE - 1] ='\0';
  return cmdline_buf;
}

#define CS_CONFIG_CS_EN (1<<31)
#define CS_BNDS_SA(x)  ((((uint32_t)(x))>>(31-15)) & 0xff)
#define CS_BNDS_EA(x)  ((((uint32_t)(x))>>(31-31)) & 0xff)

static inline uint32_t
_ccsr_rd32(uint32_t off)
{
  return in_be32( (volatile uint32_t *)(BSP_8540_CCSR_BASE + off) );
}

static inline void
_ccsr_wr32(uint32_t off, uint32_t val)
{
  out_be32( (volatile uint32_t *)(BSP_8540_CCSR_BASE + off), val );
}


STATIC uint32_t
BSP_get_mem_size( void )
{
  int i;
  uint32_t  cs_bnds, cs_config;
  uint32_t  memsz=0;
  uint32_t  v;

  for ( cs_bnds = 0x2000, cs_config=0x2080, i=0; i<4; i++, cs_bnds+=8, cs_config+=4 ) {
    if ( CS_CONFIG_CS_EN & _ccsr_rd32( cs_config ) ) {
      v = _ccsr_rd32( cs_bnds );

      memsz += CS_BNDS_EA(v) - CS_BNDS_SA(v) + 1;
    }
  }
  return memsz << 24;
}

STATIC void
BSP_calc_freqs( void )
{
  uint32_t  porpllsr   = _ccsr_rd32( 0xe0000 );
  unsigned  plat_ratio = (porpllsr >> (31-30)) & 0x1f;
  unsigned    e500_ratio = (porpllsr >> (31-15)) & 0x3f;

  switch ( plat_ratio ) {
    case  2: case  3: case  4: case  5: case  6:
    case  8: case  9: case 10: case 12: case 16:
    /* supported ratios */
      BSP_bus_frequency = BSP_pci_bus_frequency * plat_ratio;
    break;

    default:
      rtems_panic("Unknown PLL sys-clock ratio; something's wrong here");
  }

  switch ( e500_ratio ) {
    case 4: case 5: case 6: case 7:
      BSP_processor_frequency = (BSP_pci_bus_frequency * e500_ratio) >> 1;
    break;

    default:
      rtems_panic("Unknown PLL e500-clock ratio; something's wrong here");
  }

  printk("Core Complex Bus (CCB) Clock Freq: %10u Hz\n", BSP_bus_frequency);
  printk("CPU Clock Freq:                    %10u Hz\n", BSP_processor_frequency);
}

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

#include <libcpu/spr.h>

SPR_RW(HID1)

void bsp_start( void )
{
  unsigned char       *stack;
  uintptr_t            intrStackStart;
  uintptr_t            intrStackSize;
  char                *chpt;
  int                  i;
  ppc_cpu_id_t         myCpu;
  ppc_cpu_revision_t   myCpuRevision;
  E500_tlb_va_cache_t *tlb;

VpdBufRec          vpdData [] = {
 { key: ProductIdent, instance: 0, buf: BSP_productIdent, buflen: sizeof(BSP_productIdent) - 1 },
 { key: SerialNumber, instance: 0, buf: BSP_serialNumber, buflen: sizeof(BSP_serialNumber) - 1 },
 { key: BusClockHz,   instance: 0, buf: &BSP_pci_bus_frequency, buflen: sizeof(BSP_pci_bus_frequency)  },
 { key: EthernetAddr, instance: 0, buf: BSP_enetAddr0, buflen: sizeof(BSP_enetAddr0) },
 { key: EthernetAddr, instance: 1, buf: BSP_enetAddr1, buflen: sizeof(BSP_enetAddr1) },
 { key: EthernetAddr, instance: 2, buf: BSP_enetAddr2, buflen: sizeof(BSP_enetAddr2) },
 VPD_END
};

  /* Intersperse messages with actions to help locate problems */
  printk("-----------------------------------------\n");

  /*
   * 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();

  printk("Welcome to %s\n", _RTEMS_version);
  printk("BSP: %s, CVS Release ($Name$)\n", "mvme3100");

  /*
   * 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.
   */
  asm volatile("mr %0, 1":"=r"(stack));

  /* tag the bottom */
  *((uint32_t*)stack) = 0;

  /*
   * Initialize the interrupt related settings.
   */
  intrStackStart = (uintptr_t) __rtems_end;
  intrStackSize = rtems_configuration_get_interrupt_stack_size();

  /*
   * Initialize default raw exception handlers.
   */
  ppc_exc_initialize(intrStackStart, intrStackSize);

  printk("CPU 0x%x - rev 0x%x\n", myCpu, myCpuRevision);

#ifdef SHOW_MORE_INIT_SETTINGS
  printk("Additionnal boot options are %s\n", BSP_commandline_string);
  printk("Initial system stack at %" PRIxPTR "\n", (uintptr_t) stack);
  printk("Software IRQ stack starts at %x with size %u\n", intrStackStart, intrStackSize);
#endif

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

  BSP_mem_size            = BSP_get_mem_size();

  {
    /* memory-select errors were disabled in 'start.S';
     * motload has all TLBs mapping a possible larger area as
     * memory (not-guarded, caching-enabled) than actual physical
     * memory is available.
     * In case of speculative loads this may cause 'memory-select' errors
     * which seem to raise 'core_fault_in' (found no description in
     * the manual but I experienced this problem).
     * Such errors (if HID1[RFXE] is clear) may *stall* execution
     * leading to mysterious 'hangs'.
     *
     * Here we remove all mappings, re-enable memory-select
     * errors and make sure we enable HID1[RFXE] to avoid
     * stalls (since we don't implement handling individual
     * error-handling interrupts).
     */

    /* enable machine check for bad bus errors */
    _write_HID1( _read_HID1() | 0x20000 );

    rtems_e500_initlb();

    for ( i=0, tlb=rtems_e500_tlb_va_cache; i<NumberOf(rtems_e500_tlb_va_cache); i++, tlb++ ) {
      /* disable TLBs for caching-enabled, non-guarded areas
       * beyond physical memory
       */
      if (    tlb->att.v
          &&  0xa != (tlb->att.wimge & 0xa)
        &&  (tlb->va.va_epn<<12) >= BSP_mem_size ) {
        rtems_e500_clrtlb( E500_SELTLB_1 | i );
      }
    }

    /* clear all pending memory errors */
    _ccsr_wr32(0x2e40, 0xffffffff);
    /* enable checking for memory-select errors */
    _ccsr_wr32(0x2e44, _ccsr_rd32(0x2e44) & ~1 );
  }

  BSP_vpdRetrieveFields( vpdData );

  printk("Board Type: %s (S/N %s)\n",
      BSP_productIdent[0] ? BSP_productIdent : "n/a",
      BSP_serialNumber[0] ? BSP_serialNumber : "n/a");

  printk("External (=PCI Bus) Clock Freq   ");
  if ( 0xdeadbeef == BSP_pci_bus_frequency ) {
    BSP_pci_bus_frequency  = 66666666;
    printk(" NOT FOUND in VPD; using %10u Hz\n",
        BSP_pci_bus_frequency);
  } else {
    printk(": %10u Hz\n",
        BSP_pci_bus_frequency);
  }

  /* Calculate CPU and CCB bus freqs */
  BSP_calc_freqs();

  pci_initialize();

  prether(BSP_enetAddr0, 0);
  prether(BSP_enetAddr1, 1);
  prether(BSP_enetAddr2, 2);

  /* need to tweak the motload setup */
  BSP_motload_pci_fixup();

#ifdef SHOW_MORE_INIT_SETTINGS
  printk("Number of PCI buses found is : %d\n", pci_bus_count());
  {
    BSP_pciConfigDump_early();
  }
#endif

  if ( (chpt = strstr(BSP_commandline_string,"MEMSZ=")) ) {
    char    *endp;
    uint32_t   sz;
    chpt+=6 /* strlen("MEMSZ=") */;
    sz = strtoul(chpt, &endp, 0);
    if ( endp != chpt )
      BSP_mem_size = sz;
  }

  printk("Memory:                            %10u bytes\n", BSP_mem_size);

  BSP_bus_frequency       = 333333333;
  BSP_processor_frequency = 833333333;
  BSP_time_base_divisor   = 8000; /* if external RTC clock unused (HID0) */

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

  bsp_clicks_per_usec = BSP_bus_frequency/(BSP_time_base_divisor * 1000);
  rtems_counter_initialize_converter(
    BSP_bus_frequency / (BSP_time_base_divisor / 1000)
  );

  /*
   * Initalize RTEMS IRQ system
   */
  BSP_rtems_irq_mng_init(0);

  if (1) {
    int i;
    unsigned msr,tcr;
    asm volatile("mfmsr %0":"=r"(msr));
    asm volatile("mftcr %0":"=r"(tcr));
    printk("MSR is 0x%08x, TCR 0x%08x\n",msr,tcr);
    asm volatile("mttcr %0"::"r"(0));
    if (0) {
      asm volatile("mtmsr %0"::"r"(msr|0x8000));
      for (i=0; i<12; i++)
        BSP_enable_irq_at_pic(i);
      printk("IRQS enabled\n");
    }
  }

  if (0) {
    unsigned x;
    asm volatile("mfivpr %0":"=r"(x));
    printk("IVPR: 0x%08x\n",x);
    asm volatile("mfivor8 %0":"=r"(x));
    printk("IVOR8: 0x%08x\n",x);
    printk("0x%08x\n",*(unsigned *)0xc00);
    printk("0x%08x\n",*(unsigned *)0xc04);
    printk("0x%08x\n",*(unsigned *)0xc08);
    printk("0x%08x\n\n\n",*(unsigned *)0xc0c);
    if (0) {
      *(unsigned *)0xc08 = 0x4c000064;
      asm volatile("dcbf 0, %0; icbi 0, %0; sync; isync"::"r"(0xc00));
    }

    printk("0x%08x\n", ppc_exc_lock_std);
    printk("0x%08x\n", ppc_exc_gpr3_std);

    asm volatile("sc");

    printk("0x%08x\n", ppc_exc_lock_std);
    printk("0x%08x\n", ppc_exc_gpr3_std);
  }

  printk("-----------------------------------------\n");

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