1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup mpc83xx |
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5 | * |
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6 | * @brief Source for 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) 2008-2014 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 | * <info@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 <rtems/counter.h> |
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24 | |
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25 | #include <libchip/ns16550.h> |
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26 | |
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27 | #include <libcpu/powerpc-utility.h> |
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28 | |
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29 | #include <bsp.h> |
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30 | #include <bsp/vectors.h> |
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31 | #include <bsp/bootcard.h> |
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32 | #include <bsp/irq-generic.h> |
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33 | #include <bsp/linker-symbols.h> |
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34 | #include <bsp/u-boot.h> |
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35 | #include <bsp/console-termios.h> |
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36 | |
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37 | /* Configuration parameters for console driver, ... */ |
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38 | unsigned int BSP_bus_frequency; |
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39 | |
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40 | /* Configuration parameter for clock driver */ |
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41 | uint32_t bsp_time_base_frequency; |
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42 | |
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43 | /* Legacy */ |
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44 | uint32_t bsp_clicks_per_usec; |
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45 | |
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46 | /* Default decrementer exception handler */ |
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47 | static int mpc83xx_decrementer_exception_handler( BSP_Exception_frame *frame, unsigned number) |
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48 | { |
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49 | ppc_set_decrementer_register(UINT32_MAX); |
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50 | |
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51 | return 0; |
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52 | } |
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53 | |
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54 | void bsp_start( void) |
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55 | { |
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56 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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57 | unsigned long i = 0; |
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58 | |
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59 | /* |
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60 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() function |
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61 | * store the result in global variables so that it can be used latter... |
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62 | */ |
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63 | get_ppc_cpu_type(); |
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64 | get_ppc_cpu_revision(); |
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65 | |
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66 | /* Basic CPU initialization */ |
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67 | cpu_init(); |
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68 | |
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69 | /* |
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70 | * Enable instruction and data caches. Do not force writethrough mode. |
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71 | */ |
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72 | |
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73 | #ifdef BSP_INSTRUCTION_CACHE_ENABLED |
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74 | rtems_cache_enable_instruction(); |
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75 | #endif |
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76 | |
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77 | #ifdef BSP_DATA_CACHE_ENABLED |
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78 | rtems_cache_enable_data(); |
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79 | #endif |
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80 | |
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81 | /* |
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82 | * This is evaluated during runtime, so it should be ok to set it |
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83 | * before we initialize the drivers. |
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84 | */ |
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85 | |
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86 | /* Initialize some device driver parameters */ |
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87 | |
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88 | #ifdef HAS_UBOOT |
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89 | BSP_bus_frequency = bsp_uboot_board_info.bi_busfreq; |
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90 | #else /* HAS_UBOOT */ |
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91 | BSP_bus_frequency = BSP_CLKIN_FRQ * BSP_SYSPLL_MF / BSP_SYSPLL_CKID; |
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92 | #endif /* HAS_UBOOT */ |
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93 | bsp_time_base_frequency = BSP_bus_frequency / 4; |
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94 | bsp_clicks_per_usec = bsp_time_base_frequency / 1000000; |
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95 | rtems_counter_initialize_converter(bsp_time_base_frequency); |
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96 | |
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97 | /* Initialize some console parameters */ |
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98 | for (i = 0; i < console_device_count; ++i) { |
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99 | ns16550_context *ctx = (ns16550_context *) console_device_table[i].context; |
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100 | |
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101 | ctx->clock = BSP_bus_frequency; |
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102 | |
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103 | #ifdef HAS_UBOOT |
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104 | ctx->initial_baud = bsp_uboot_board_info.bi_baudrate; |
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105 | #endif |
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106 | } |
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107 | |
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108 | /* Initialize exception handler */ |
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109 | #ifndef BSP_DATA_CACHE_ENABLED |
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110 | ppc_exc_cache_wb_check = 0; |
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111 | #endif |
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112 | ppc_exc_initialize( |
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113 | (uintptr_t) bsp_section_work_begin, |
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114 | rtems_configuration_get_interrupt_stack_size() |
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115 | ); |
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116 | |
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117 | /* Install default handler for the decrementer exception */ |
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118 | sc = ppc_exc_set_handler( ASM_DEC_VECTOR, mpc83xx_decrementer_exception_handler); |
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119 | if (sc != RTEMS_SUCCESSFUL) { |
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120 | rtems_panic("cannot install decrementer exception handler"); |
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121 | } |
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122 | |
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123 | /* Initalize interrupt support */ |
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124 | bsp_interrupt_initialize(); |
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125 | |
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126 | #ifdef SHOW_MORE_INIT_SETTINGS |
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127 | printk("Exit from bspstart\n"); |
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128 | #endif |
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129 | } |
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