1 | /*===============================================================*\ |
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2 | | Project: RTEMS generic MPC83xx BSP | |
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3 | +-----------------------------------------------------------------+ |
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4 | | Copyright (c) 2007 | |
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5 | | Embedded Brains GmbH | |
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6 | | Obere Lagerstr. 30 | |
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7 | | D-82178 Puchheim | |
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8 | | Germany | |
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9 | | rtems@embedded-brains.de | |
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10 | +-----------------------------------------------------------------+ |
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11 | | The license and distribution terms for this file may be | |
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12 | | found in the file LICENSE in this distribution or at | |
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13 | | | |
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14 | | http://www.rtems.com/license/LICENSE. | |
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15 | | | |
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16 | +-----------------------------------------------------------------+ |
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17 | | this file contains the BSP startup code | |
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18 | \*===============================================================*/ |
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19 | |
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20 | /* |
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21 | * $Id$ |
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22 | */ |
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23 | |
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24 | #include <bsp.h> |
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25 | |
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26 | #include <rtems/libio.h> |
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27 | #include <rtems/libcsupport.h> |
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28 | #include <rtems/powerpc/powerpc.h> |
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29 | #include <rtems/score/thread.h> |
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30 | |
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31 | #include <rtems/bspIo.h> |
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32 | #include <libcpu/cpuIdent.h> |
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33 | #include <libcpu/spr.h> |
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34 | #include <bsp/irq.h> |
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35 | |
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36 | #include <string.h> |
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37 | |
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38 | SPR_RW(SPRG0) |
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39 | SPR_RW(SPRG1) |
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40 | |
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41 | extern unsigned long intrStackPtr; |
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42 | static char *BSP_heap_start, *BSP_heap_end; |
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43 | |
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44 | /* |
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45 | * constants for c_clock driver: |
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46 | * system bus frequency (for timebase etc) |
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47 | * and |
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48 | * Time base divisior: scaling value: |
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49 | * BSP_time_base_divisor = TB ticks per millisecond/BSP_bus_frequency |
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50 | */ |
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51 | unsigned int BSP_bus_frequency = BSP_CSB_CLK_FRQ; |
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52 | unsigned int BSP_time_base_divisor = 4000; /* 4 bus clicks per TB click */ |
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53 | |
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54 | /* |
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55 | * Driver configuration parameters |
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56 | */ |
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57 | uint32_t bsp_clicks_per_usec; |
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58 | |
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59 | /* |
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60 | * Use the shared implementations of the following routines. |
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61 | * Look in rtems/c/src/lib/libbsp/shared/bsplibc.c. |
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62 | */ |
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63 | void bsp_libc_init( void *, uint32_t, int ); |
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64 | extern void initialize_exceptions(void); |
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65 | extern void cpu_init(void); |
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66 | |
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67 | void BSP_panic(char *s) |
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68 | { |
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69 | printk("%s PANIC %s\n",_RTEMS_version, s); |
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70 | /* |
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71 | * FIXME: hang/restart system |
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72 | */ |
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73 | __asm__ __volatile ("sc"); |
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74 | } |
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75 | |
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76 | void _BSP_Fatal_error(unsigned int v) |
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77 | { |
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78 | printk("%s PANIC ERROR %x\n",_RTEMS_version, v); |
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79 | /* |
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80 | * FIXME: hang/restart system |
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81 | */ |
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82 | __asm__ __volatile ("sc"); |
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83 | } |
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84 | |
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85 | /* |
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86 | * Function: bsp_pretasking_hook |
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87 | * Created: 95/03/10 |
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88 | * |
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89 | * Description: |
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90 | * BSP pretasking hook. Called just before drivers are initialized. |
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91 | * Used to setup libc and install any BSP extensions. |
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92 | * |
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93 | * NOTES: |
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94 | * Must not use libc (to do io) from here, since drivers are |
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95 | * not yet initialized. |
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96 | * |
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97 | */ |
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98 | |
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99 | void |
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100 | bsp_pretasking_hook(void) |
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101 | { |
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102 | |
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103 | /* |
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104 | * initialize libc including the heap |
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105 | */ |
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106 | bsp_libc_init( BSP_heap_start, |
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107 | BSP_heap_end - BSP_heap_start, |
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108 | 0); |
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109 | |
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110 | |
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111 | #ifdef STACK_CHECKER_ON |
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112 | /* |
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113 | * Initialize the stack bounds checker |
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114 | * We can either turn it on here or from the app. |
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115 | */ |
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116 | |
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117 | Stack_check_Initialize(); |
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118 | #endif |
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119 | |
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120 | #ifdef RTEMS_DEBUG |
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121 | rtems_debug_enable( RTEMS_DEBUG_ALL_MASK ); |
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122 | #endif |
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123 | } |
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124 | |
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125 | void bsp_calc_mem_layout() |
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126 | { |
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127 | /* |
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128 | * these labels (!) are defined in the linker command file |
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129 | * or when the linker is invoked |
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130 | * NOTE: the information(size) is the address of the object, |
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131 | * not the object otself |
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132 | */ |
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133 | extern unsigned char TopRamReserved; |
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134 | extern unsigned char _WorkspaceBase[]; |
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135 | |
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136 | /* |
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137 | * compute the memory layout: |
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138 | * - first unused address is Workspace start |
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139 | * - Heap starts at end of workspace |
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140 | * - Heap ends at end of memory - reserved memory area |
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141 | */ |
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142 | Configuration.work_space_start = _WorkspaceBase; |
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143 | |
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144 | BSP_heap_start = ((char *)Configuration.work_space_start + |
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145 | rtems_configuration_get_work_space_size()); |
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146 | |
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147 | #if defined(HAS_UBOOT) |
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148 | BSP_heap_end = (uboot_bdinfo_ptr->bi_memstart |
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149 | + uboot_bdinfo_ptr->bi_memsize |
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150 | - (uint32_t)&TopRamReserved); |
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151 | #else |
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152 | BSP_heap_end = (void *)(RAM_END - (uint32_t)&TopRamReserved); |
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153 | #endif |
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154 | |
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155 | } |
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156 | |
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157 | |
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158 | void bsp_start(void) |
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159 | { |
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160 | ppc_cpu_id_t myCpu; |
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161 | ppc_cpu_revision_t myCpuRevision; |
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162 | register unsigned char* intrStack; |
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163 | |
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164 | /* |
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165 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() function |
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166 | * store the result in global variables so that it can be used latter... |
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167 | */ |
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168 | myCpu = get_ppc_cpu_type(); |
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169 | myCpuRevision = get_ppc_cpu_revision(); |
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170 | /* |
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171 | * determine heap and workspace placement |
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172 | */ |
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173 | bsp_calc_mem_layout(); |
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174 | |
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175 | cpu_init(); |
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176 | |
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177 | /* |
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178 | * Initialize some SPRG registers related to irq handling |
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179 | */ |
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180 | |
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181 | intrStack = (((unsigned char*)&intrStackPtr) - PPC_MINIMUM_STACK_FRAME_SIZE); |
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182 | |
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183 | _write_SPRG1((unsigned int)intrStack); |
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184 | |
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185 | /* Signal them that this BSP has fixed PR288 - eventually, this should |
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186 | * go away |
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187 | */ |
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188 | _write_SPRG0(PPC_BSP_HAS_FIXED_PR288); |
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189 | |
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190 | /* |
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191 | * initialize the device driver parameters |
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192 | */ |
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193 | bsp_clicks_per_usec = (BSP_CSB_CLK_FRQ/1000000); |
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194 | |
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195 | /* |
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196 | * Install our own set of exception vectors |
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197 | */ |
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198 | |
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199 | initialize_exceptions(); |
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200 | |
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201 | /* |
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202 | * Enable instruction and data caches. Do not force writethrough mode. |
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203 | */ |
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204 | #if INSTRUCTION_CACHE_ENABLE |
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205 | rtems_cache_enable_instruction(); |
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206 | #endif |
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207 | #if DATA_CACHE_ENABLE |
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208 | rtems_cache_enable_data(); |
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209 | #endif |
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210 | |
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211 | /* |
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212 | * Allocate the memory for the RTEMS Work Space. This can come from |
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213 | * a variety of places: hard coded address, malloc'ed from outside |
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214 | * RTEMS world (e.g. simulator or primitive memory manager), or (as |
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215 | * typically done by stock BSPs) by subtracting the required amount |
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216 | * of work space from the last physical address on the CPU board. |
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217 | */ |
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218 | |
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219 | /* |
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220 | * Initalize RTEMS IRQ system |
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221 | */ |
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222 | BSP_rtems_irq_mng_init(0); |
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223 | |
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224 | #ifdef SHOW_MORE_INIT_SETTINGS |
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225 | printk("Exit from bspstart\n"); |
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226 | #endif |
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227 | |
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228 | } |
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229 | |
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230 | /* |
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231 | * |
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232 | * _Thread_Idle_body |
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233 | * |
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234 | * Replaces the one in c/src/exec/score/src/threadidlebody.c |
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235 | * The MSR[POW] bit is set to put the CPU into the low power mode |
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236 | * defined in HID0. HID0 is set during starup in start.S. |
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237 | * |
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238 | */ |
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239 | Thread _Thread_Idle_body(uint32_t ignored ) |
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240 | { |
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241 | |
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242 | for(;;) |
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243 | { |
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244 | |
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245 | asm volatile("mfmsr 3; oris 3,3,4; sync; mtmsr 3; isync; ori 3,3,0; ori 3,3,0"); |
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246 | |
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247 | } |
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248 | |
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249 | return 0; |
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250 | |
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251 | } |
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252 | |
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