LXR uboot/arch/blackfin/cpu/cpu.c

   1/*
   2 * U-boot - cpu.c CPU specific functions
   3 *
   4 * Copyright (c) 2005-2008 Analog Devices Inc.
   5 *
   6 * (C) Copyright 2000-2004
   7 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8 *
   9 * Licensed under the GPL-2 or later.
  10 */
  11
  12#include <common.h>
  13#include <command.h>
  14#include <asm/blackfin.h>
  15#include <asm/cplb.h>
  16#include <asm/mach-common/bits/core.h>
  17#include <asm/mach-common/bits/ebiu.h>
  18#include <asm/mach-common/bits/trace.h>
  19
  20#include "cpu.h"
  21#include "serial.h"
  22#include "initcode.h"
  23
  24ulong bfin_poweron_retx;
  25
  26__attribute__ ((__noreturn__))
  27void cpu_init_f(ulong bootflag, ulong loaded_from_ldr)
  28{
  29#ifndef CONFIG_BFIN_BOOTROM_USES_EVT1
  30        /* Build a NOP slide over the LDR jump block.  Whee! */
  31        char nops[0xC];
  32        serial_early_puts("NOP Slide\n");
  33        memset(nops, 0x00, sizeof(nops));
  34        memcpy((void *)L1_INST_SRAM, nops, sizeof(nops));
  35#endif
  36
  37        if (!loaded_from_ldr) {
  38                /* Relocate sections into L1 if the LDR didn't do it -- don't
  39                 * check length because the linker script does the size
  40                 * checking at build time.
  41                 */
  42                serial_early_puts("L1 Relocate\n");
  43                extern char _stext_l1[], _text_l1_lma[], _text_l1_len[];
  44                memcpy(&_stext_l1, &_text_l1_lma, (unsigned long)_text_l1_len);
  45                extern char _sdata_l1[], _data_l1_lma[], _data_l1_len[];
  46                memcpy(&_sdata_l1, &_data_l1_lma, (unsigned long)_data_l1_len);
  47        }
  48
  49        /*
  50         * Make sure our async settings are committed.  Some bootroms
  51         * (like the BF537) will reset some registers on us after it
  52         * has finished loading the LDR.  Or if we're booting over
  53         * JTAG, the initcode never got a chance to run.  Or if we
  54         * aren't booting from parallel flash, the initcode skipped
  55         * this step completely.
  56         */
  57        program_async_controller(NULL);
  58
  59        /* Save RETX so we can pass it while booting Linux */
  60        bfin_poweron_retx = bootflag;
  61
  62#ifdef CONFIG_DEBUG_DUMP
  63        /* Turn on hardware trace buffer */
  64        bfin_write_TBUFCTL(TBUFPWR | TBUFEN);
  65#endif
  66
  67#ifndef CONFIG_PANIC_HANG
  68        /* Reset upon a double exception rather than just hanging.
  69         * Do not do bfin_read on SWRST as that will reset status bits.
  70         */
  71        bfin_write_SWRST(DOUBLE_FAULT);
  72#endif
  73
  74        serial_early_puts("Board init flash\n");
  75        board_init_f(bootflag);
  76}
  77
  78int exception_init(void)
  79{
  80        bfin_write_EVT3(trap);
  81        return 0;
  82}
  83
  84int irq_init(void)
  85{
  86#ifdef SIC_IMASK0
  87        bfin_write_SIC_IMASK0(0);
  88        bfin_write_SIC_IMASK1(0);
  89# ifdef SIC_IMASK2
  90        bfin_write_SIC_IMASK2(0);
  91# endif
  92#elif defined(SICA_IMASK0)
  93        bfin_write_SICA_IMASK0(0);
  94        bfin_write_SICA_IMASK1(0);
  95#else
  96        bfin_write_SIC_IMASK(0);
  97#endif
  98        /* Set up a dummy NMI handler if needed.  */
  99        if (CONFIG_BFIN_BOOT_MODE == BFIN_BOOT_BYPASS || ANOMALY_05000219)
 100                bfin_write_EVT2(evt_nmi);       /* NMI */
 101        bfin_write_EVT5(evt_default);   /* hardware error */
 102        bfin_write_EVT6(evt_default);   /* core timer */
 103        bfin_write_EVT7(evt_default);
 104        bfin_write_EVT8(evt_default);
 105        bfin_write_EVT9(evt_default);
 106        bfin_write_EVT10(evt_default);
 107        bfin_write_EVT11(evt_default);
 108        bfin_write_EVT12(evt_default);
 109        bfin_write_EVT13(evt_default);
 110        bfin_write_EVT14(evt_default);
 111        bfin_write_EVT15(evt_default);
 112        bfin_write_ILAT(0);
 113        CSYNC();
 114        /* enable hardware error irq */
 115        irq_flags = 0x3f;
 116        local_irq_enable();
 117        return 0;
 118}
 119