1 | /* |
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2 | * Cogent CSB336 - MC9328MXL SBC startup code |
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3 | * |
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4 | * Copyright (c) 2004 by Cogent Computer Systems |
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5 | * Written by Jay Monkman <jtm@lopingdog.com> |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * |
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10 | * http://www.OARcorp.com/rtems/license.html. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | #include <bsp.h> |
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15 | #include <rtems/libcsupport.h> |
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16 | #include <rtems/bspIo.h> |
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17 | #include <rtems/libio.h> |
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18 | #include <mc9328mxl.h> |
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19 | |
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20 | /* Global Variables */ |
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21 | extern void *_flash_size; |
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22 | extern void *_flash_base; |
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23 | extern void *_sdram_size; |
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24 | extern void *_sdram_base; |
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25 | extern void *_bss_free_start; |
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26 | |
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27 | unsigned long free_mem_start; |
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28 | unsigned long free_mem_end; |
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29 | |
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30 | rtems_configuration_table BSP_Configuration; |
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31 | |
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32 | rtems_cpu_table Cpu_table; |
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33 | char *rtems_progname = "RTEMS"; |
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34 | |
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35 | extern void rtems_irq_mngt_init(void); |
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36 | void bsp_libc_init( void *, uint32_t, int ); |
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37 | void bsp_postdriver_hook(void); |
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38 | |
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39 | /**************************************************************************/ |
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40 | /* */ |
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41 | /* NAME: bsp_pretasking_hook - Function to setup system before startup */ |
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42 | /* */ |
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43 | /* DESCRIPTION: */ |
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44 | /* This function is called before drivers are initialized and used */ |
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45 | /* to setup libc and BSP extensions. */ |
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46 | /* */ |
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47 | /* RESTRICTIONS/LIMITATIONS: */ |
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48 | /* Since this function is setting up libc, it cannot use and libc */ |
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49 | /* functions. */ |
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50 | /* */ |
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51 | /**************************************************************************/ |
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52 | void bsp_pretasking_hook(void) |
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53 | { |
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54 | uint32_t heap_start; |
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55 | uint32_t heap_size; |
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56 | |
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57 | /* |
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58 | * Set up the heap. |
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59 | */ |
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60 | heap_start = free_mem_start; |
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61 | heap_size = free_mem_end - free_mem_start; |
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62 | |
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63 | /* call rtems lib init - malloc stuff */ |
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64 | bsp_libc_init((void *)heap_start, heap_size, 0); |
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65 | |
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66 | #ifdef RTEMS_DEBUG |
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67 | |
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68 | rtems_debug_enable(RTEMS_DEBUG_ALL_MASK); |
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69 | |
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70 | #endif /* RTEMS_DEBUG */ |
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71 | |
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72 | } |
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73 | |
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74 | |
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75 | /**************************************************************************/ |
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76 | /* */ |
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77 | /* NAME: bsp_start_default - BSP initialization function */ |
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78 | /* */ |
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79 | /* DESCRIPTION: */ |
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80 | /* This function is called before RTEMS is initialized and used */ |
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81 | /* adjust the kernel's configuration. */ |
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82 | /* */ |
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83 | /* This function also configures the CPU's memory protection unit. */ |
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84 | /* */ |
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85 | /* RESTRICTIONS/LIMITATIONS: */ |
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86 | /* Since RTEMS is not configured, no RTEMS functions can be called. */ |
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87 | /* */ |
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88 | /**************************************************************************/ |
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89 | void bsp_start_default( void ) |
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90 | { |
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91 | |
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92 | /* disable interrupts */ |
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93 | MC9328MXL_AITC_INTENABLEL = 0; |
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94 | MC9328MXL_AITC_INTENABLEH = 0; |
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95 | |
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96 | /* Set interrupt priority to -1 (allow all priorities) */ |
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97 | MC9328MXL_AITC_NIMASK = 0x1f; |
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98 | |
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99 | /* tell rtems about the hooks we are using */ |
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100 | Cpu_table.pretasking_hook = bsp_pretasking_hook; |
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101 | Cpu_table.postdriver_hook = bsp_postdriver_hook; |
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102 | |
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103 | /* tell rtems to clear the workspace by default */ |
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104 | Cpu_table.do_zero_of_workspace = TRUE; |
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105 | |
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106 | /* Place RTEMS workspace at beginning of free memory. */ |
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107 | BSP_Configuration.work_space_start = (void *)&_bss_free_start; |
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108 | |
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109 | free_mem_start = ((uint32_t)&_bss_free_start + |
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110 | BSP_Configuration.work_space_size); |
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111 | |
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112 | free_mem_end = ((uint32_t)&_sdram_base + (uint32_t)&_sdram_size); |
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113 | |
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114 | |
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115 | /* |
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116 | * Init rtems exceptions management |
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117 | */ |
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118 | rtems_exception_init_mngt(); |
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119 | |
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120 | /* |
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121 | * Init rtems interrupt management |
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122 | */ |
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123 | rtems_irq_mngt_init(); |
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124 | |
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125 | |
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126 | /* |
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127 | * The following information is very useful when debugging. |
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128 | */ |
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129 | #if 0 |
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130 | printk( "work_space_size = 0x%x\n", |
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131 | BSP_Configuration.work_space_size ); |
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132 | printk( "maximum_extensions = 0x%x\n", |
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133 | BSP_Configuration.maximum_extensions ); |
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134 | printk( "microseconds_per_tick = 0x%x\n", |
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135 | BSP_Configuration.microseconds_per_tick ); |
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136 | printk( "ticks_per_timeslice = 0x%x\n", |
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137 | BSP_Configuration.ticks_per_timeslice ); |
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138 | printk( "maximum_devices = 0x%x\n", |
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139 | BSP_Configuration.maximum_devices ); |
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140 | printk( "number_of_device_drivers = 0x%x\n", |
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141 | BSP_Configuration.number_of_device_drivers ); |
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142 | printk( "Device_driver_table = 0x%x\n", |
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143 | BSP_Configuration.Device_driver_table ); |
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144 | printk( "work_space_start = 0x%x\n", |
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145 | BSP_Configuration.work_space_start ); |
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146 | printk( "work_space_size = 0x%x\n", |
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147 | BSP_Configuration.work_space_size ); |
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148 | #endif |
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149 | } /* bsp_start */ |
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150 | |
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151 | |
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152 | |
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153 | /* Calcuate the frequency for perclk1 */ |
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154 | int get_perclk1_freq(void) |
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155 | { |
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156 | int fin; |
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157 | int fpll; |
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158 | int pd; |
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159 | int mfd; |
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160 | int mfi; |
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161 | int mfn; |
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162 | uint32_t reg; |
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163 | int perclk1; |
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164 | |
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165 | if (MC9328MXL_PLL_CSCR & MC9328MXL_PLL_CSCR_SYSSEL) { |
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166 | /* Use external oscillator */ |
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167 | fin = BSP_OSC_FREQ; |
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168 | } else { |
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169 | /* Use scaled xtal freq */ |
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170 | fin = BSP_XTAL_FREQ * 512; |
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171 | } |
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172 | |
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173 | /* calculate the output of the system PLL */ |
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174 | reg = MC9328MXL_PLL_SPCTL0; |
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175 | pd = ((reg & MC9328MXL_PLL_SPCTL_PD_MASK) >> |
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176 | MC9328MXL_PLL_SPCTL_PD_SHIFT); |
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177 | mfd = ((reg & MC9328MXL_PLL_SPCTL_MFD_MASK) >> |
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178 | MC9328MXL_PLL_SPCTL_MFD_SHIFT); |
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179 | mfi = ((reg & MC9328MXL_PLL_SPCTL_MFI_MASK) >> |
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180 | MC9328MXL_PLL_SPCTL_MFI_SHIFT); |
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181 | mfn = ((reg & MC9328MXL_PLL_SPCTL_MFN_MASK) >> |
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182 | MC9328MXL_PLL_SPCTL_MFN_SHIFT); |
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183 | |
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184 | #if 0 |
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185 | printk("fin = %d\n", fin); |
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186 | printk("pd = %d\n", pd); |
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187 | printk("mfd = %d\n", mfd); |
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188 | printk("mfi = %d\n", mfi); |
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189 | printk("mfn = %d\n", mfn); |
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190 | printk("(fin * mfi) / (pd + 1) = %d\n", (fin * mfi) / (pd + 1)); |
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191 | printk("(fin * mfn) / ((pd + 1) * (mfd + 1)) = %d\n", |
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192 | (fin * mfn) / ((pd + 1) * (mfd + 1))); |
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193 | #endif |
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194 | |
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195 | fpll = 2 * ( ((fin * mfi) / (pd + 1)) + |
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196 | ((fin * mfn) / ((pd + 1) * (mfd + 1))) ); |
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197 | |
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198 | /* calculate the output of the PERCLK1 divider */ |
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199 | reg = MC9328MXL_PLL_PCDR; |
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200 | perclk1 = fpll / (1 + ((reg & MC9328MXL_PLL_PCDR_PCLK1_MASK) >> |
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201 | MC9328MXL_PLL_PCDR_PCLK1_SHIFT)); |
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202 | |
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203 | return perclk1; |
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204 | } |
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205 | |
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206 | /* |
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207 | * By making this a weak alias for bsp_start_default, a brave soul |
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208 | * can override the actual bsp_start routine used. |
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209 | */ |
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210 | |
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211 | void bsp_start (void) __attribute__ ((weak, alias("bsp_start_default"))); |
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212 | |
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213 | |
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214 | /** |
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215 | * Reset the system. |
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216 | * |
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217 | * This functions enables the watchdog and waits for it to |
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218 | * fire, thus resetting the system. |
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219 | */ |
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220 | /** |
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221 | * Reset the system. |
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222 | * |
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223 | * This functions enables the watchdog and waits for it to |
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224 | * fire, thus resetting the system. |
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225 | */ |
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226 | void bsp_reset(void) |
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227 | { |
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228 | rtems_interrupt_level level; |
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229 | |
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230 | _CPU_ISR_Disable(level); |
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231 | |
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232 | printk("\n\rI should reset here.\n\r"); |
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233 | while(1); |
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234 | } |
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