1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup mpc55xx |
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5 | * |
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6 | * @brief BSP startup code. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2008-2013 embedded brains GmbH. All rights reserved. |
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11 | * |
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12 | * embedded brains GmbH |
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13 | * Dornierstr. 4 |
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14 | * 82178 Puchheim |
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15 | * Germany |
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16 | * <rtems@embedded-brains.de> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | */ |
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22 | |
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23 | #include <mpc55xx/mpc55xx.h> |
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24 | #include <mpc55xx/regs.h> |
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25 | #include <mpc55xx/edma.h> |
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26 | #include <mpc55xx/emios.h> |
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27 | |
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28 | #include <string.h> |
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29 | |
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30 | #include <rtems.h> |
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31 | #include <rtems/config.h> |
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32 | #include <rtems/counter.h> |
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33 | |
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34 | #include <libcpu/powerpc-utility.h> |
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35 | #include <bsp/vectors.h> |
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36 | |
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37 | #include <bsp.h> |
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38 | #include <bsp/bootcard.h> |
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39 | #include <bsp/irq.h> |
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40 | #include <bsp/irq-generic.h> |
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41 | #include <bsp/linker-symbols.h> |
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42 | #include <bsp/start.h> |
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43 | #include <bsp/mpc55xx-config.h> |
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44 | |
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45 | /* Symbols defined in linker command file */ |
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46 | LINKER_SYMBOL(mpc55xx_exc_vector_base); |
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47 | |
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48 | unsigned int bsp_clock_speed = 0; |
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49 | |
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50 | uint32_t bsp_clicks_per_usec = 0; |
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51 | |
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52 | void _BSP_Fatal_error(unsigned n) |
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53 | { |
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54 | rtems_interrupt_level level; |
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55 | |
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56 | (void) level; |
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57 | rtems_interrupt_disable( level); |
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58 | |
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59 | while (true) { |
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60 | mpc55xx_wait_for_interrupt(); |
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61 | } |
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62 | } |
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63 | |
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64 | static void null_pointer_protection(void) |
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65 | { |
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66 | #ifdef MPC55XX_NULL_POINTER_PROTECTION |
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67 | struct MMU_tag mmu = { .MAS0 = { .B = { .TLBSEL = 1, .ESEL = 1 } } }; |
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68 | |
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69 | PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS0, mmu.MAS0.R); |
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70 | __asm__ volatile ("tlbre"); |
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71 | mmu.MAS1.R = PPC_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1); |
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72 | mmu.MAS1.B.VALID = 0; |
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73 | PPC_SET_SPECIAL_PURPOSE_REGISTER(FSL_EIS_MAS1, mmu.MAS1.R); |
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74 | __asm__ volatile ("tlbwe"); |
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75 | #endif |
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76 | } |
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77 | |
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78 | void bsp_start(void) |
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79 | { |
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80 | null_pointer_protection(); |
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81 | |
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82 | /* |
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83 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() |
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84 | * function store the result in global variables so that it can be used |
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85 | * latter... |
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86 | */ |
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87 | get_ppc_cpu_type(); |
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88 | get_ppc_cpu_revision(); |
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89 | |
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90 | /* |
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91 | * determine clock speed |
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92 | */ |
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93 | bsp_clock_speed = mpc55xx_get_system_clock() / MPC55XX_SYSTEM_CLOCK_DIVIDER; |
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94 | |
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95 | /* Time reference value */ |
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96 | bsp_clicks_per_usec = bsp_clock_speed / 1000000; |
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97 | rtems_counter_initialize_converter(bsp_clock_speed); |
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98 | |
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99 | /* Initialize exceptions */ |
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100 | ppc_exc_initialize_with_vector_base( |
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101 | (uintptr_t) bsp_section_work_begin, |
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102 | rtems_configuration_get_interrupt_stack_size(), |
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103 | mpc55xx_exc_vector_base |
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104 | ); |
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105 | #ifndef PPC_EXC_CONFIG_USE_FIXED_HANDLER |
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106 | ppc_exc_set_handler(ASM_ALIGN_VECTOR, ppc_exc_alignment_handler); |
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107 | #endif |
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108 | |
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109 | /* Initialize interrupts */ |
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110 | bsp_interrupt_initialize(); |
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111 | |
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112 | #if MPC55XX_CHIP_FAMILY != 566 |
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113 | mpc55xx_edma_init(); |
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114 | #endif |
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115 | |
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116 | #ifdef MPC55XX_EMIOS_PRESCALER |
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117 | mpc55xx_emios_initialize(MPC55XX_EMIOS_PRESCALER); |
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118 | #endif |
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119 | } |
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