1 | /* |
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2 | * AMBA Plug & Play Bus Driver |
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3 | * |
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4 | * This driver hook performs bus scanning. |
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5 | * |
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6 | * COPYRIGHT (c) 2011. |
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7 | * Aeroflex Gaisler |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.org/license/LICENSE. |
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12 | */ |
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13 | |
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14 | #include <bsp.h> |
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15 | #include <bsp/fatal.h> |
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16 | #include <leon.h> |
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17 | #include <grlib/ambapp.h> |
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18 | #include <rtems/score/memory.h> |
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19 | #include <rtems/sysinit.h> |
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20 | |
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21 | #include <string.h> |
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22 | |
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23 | unsigned int leon3_timer_prescaler __attribute__((weak)) = 0; |
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24 | int leon3_timer_core_index __attribute__((weak)) = 0; |
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25 | |
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26 | /* AMBA Plug&Play information description. |
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27 | * |
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28 | * After software has scanned AMBA PnP it builds a tree to make |
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29 | * it easier for drivers to work with the bus architecture. |
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30 | */ |
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31 | static struct ambapp_bus ambapp_plb_instance; |
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32 | |
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33 | static void *ambapp_plb_alloc( size_t size ) |
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34 | { |
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35 | return _Memory_Allocate( _Memory_Get(), size, CPU_HEAP_ALIGNMENT ); |
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36 | } |
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37 | |
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38 | struct ambapp_bus *ambapp_plb( void ) |
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39 | { |
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40 | struct ambapp_bus *plb; |
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41 | |
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42 | plb = &ambapp_plb_instance; |
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43 | |
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44 | if ( plb->root == NULL ) { |
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45 | struct ambapp_context ctx; |
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46 | |
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47 | ctx.copy_from_device = (ambapp_memcpy_t) memcpy; |
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48 | ctx.alloc = ambapp_plb_alloc; |
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49 | |
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50 | /* Scan AMBA Plug&Play read-only information. The routine builds a PnP |
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51 | * tree into ambapp_plb in RAM, after this we never access the PnP |
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52 | * information in hardware directly any more. |
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53 | * Since on Processor Local Bus (PLB) memory mapping is 1:1 |
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54 | */ |
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55 | ambapp_scan( plb, LEON3_IO_AREA, &ctx, NULL ); |
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56 | } |
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57 | |
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58 | return plb; |
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59 | } |
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60 | |
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61 | /* If RTEMS_DRVMGR_STARTUP is defined extra code is added that |
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62 | * registers the GRLIB AMBA PnP bus driver as root driver. |
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63 | */ |
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64 | #ifdef RTEMS_DRVMGR_STARTUP |
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65 | #include <drvmgr/drvmgr.h> |
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66 | #include <grlib/ambapp_bus_grlib.h> |
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67 | |
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68 | /* Driver resources configuration for AMBA root bus. It is declared weak |
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69 | * so that the user may override it, if the defualt settings are not |
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70 | * enough. |
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71 | */ |
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72 | struct drvmgr_bus_res grlib_drv_resources __attribute__((weak)) = |
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73 | { |
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74 | .next = NULL, |
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75 | .resource = |
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76 | { |
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77 | DRVMGR_RES_EMPTY, |
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78 | } |
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79 | }; |
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80 | |
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81 | /* GRLIB AMBA bus configuration (the LEON3 root bus configuration) */ |
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82 | struct grlib_config grlib_bus_config; |
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83 | |
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84 | static void ambapp_grlib_root_initialize( void ) |
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85 | { |
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86 | /* Register Root bus, Use GRLIB AMBA PnP bus as root bus for LEON3 */ |
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87 | grlib_bus_config.abus = ambapp_plb(); |
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88 | grlib_bus_config.resources = &grlib_drv_resources; |
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89 | ambapp_grlib_root_register(&grlib_bus_config); |
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90 | } |
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91 | |
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92 | RTEMS_SYSINIT_ITEM( |
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93 | ambapp_grlib_root_initialize, |
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94 | RTEMS_SYSINIT_BSP_START, |
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95 | RTEMS_SYSINIT_ORDER_SECOND |
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96 | ); |
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97 | #endif |
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98 | |
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99 | rtems_interrupt_lock LEON3_IrqCtrl_Lock = |
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100 | RTEMS_INTERRUPT_LOCK_INITIALIZER("LEON3 IrqCtrl"); |
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101 | |
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102 | /* Pointers to Interrupt Controller configuration registers */ |
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103 | volatile struct irqmp_regs *LEON3_IrqCtrl_Regs; |
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104 | struct ambapp_dev *LEON3_IrqCtrl_Adev; |
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105 | volatile struct gptimer_regs *LEON3_Timer_Regs; |
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106 | struct ambapp_dev *LEON3_Timer_Adev; |
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107 | |
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108 | /* |
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109 | * amba_initialize |
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110 | * |
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111 | * Must be called just before drivers are initialized. |
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112 | * Used to scan system bus. Probes for AHB masters, AHB slaves and |
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113 | * APB slaves. Addresses to configuration areas of the AHB masters, |
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114 | * AHB slaves, APB slaves and APB master are storeds in |
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115 | * amba_ahb_masters, amba_ahb_slaves and amba. |
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116 | */ |
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117 | |
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118 | static void amba_initialize(void) |
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119 | { |
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120 | int icsel; |
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121 | struct ambapp_dev *adev; |
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122 | struct ambapp_bus *plb; |
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123 | |
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124 | plb = ambapp_plb(); |
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125 | |
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126 | /* Find LEON3 Interrupt controller */ |
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127 | adev = (void *)ambapp_for_each(plb, (OPTIONS_ALL|OPTIONS_APB_SLVS), |
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128 | VENDOR_GAISLER, GAISLER_IRQMP, |
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129 | ambapp_find_by_idx, NULL); |
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130 | if (adev == NULL) { |
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131 | /* PANIC IRQ controller not found! |
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132 | * |
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133 | * What else can we do but stop ... |
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134 | */ |
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135 | bsp_fatal(LEON3_FATAL_NO_IRQMP_CONTROLLER); |
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136 | } |
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137 | |
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138 | LEON3_IrqCtrl_Regs = (volatile struct irqmp_regs *)DEV_TO_APB(adev)->start; |
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139 | LEON3_IrqCtrl_Adev = adev; |
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140 | if ((LEON3_IrqCtrl_Regs->ampctrl >> 28) > 0) { |
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141 | /* IRQ Controller has support for multiple IRQ Controllers, each |
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142 | * CPU can be routed to different Controllers, we find out which |
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143 | * controller by looking at the IRQCTRL Select Register for this CPU. |
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144 | * Each Controller is located at a 4KByte offset. |
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145 | */ |
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146 | icsel = LEON3_IrqCtrl_Regs->icsel[LEON3_Cpu_Index/8]; |
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147 | icsel = (icsel >> ((7 - (LEON3_Cpu_Index & 0x7)) * 4)) & 0xf; |
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148 | LEON3_IrqCtrl_Regs += icsel; |
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149 | } |
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150 | LEON3_IrqCtrl_Regs->mask[LEON3_Cpu_Index] = 0; |
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151 | LEON3_IrqCtrl_Regs->force[LEON3_Cpu_Index] = 0; |
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152 | LEON3_IrqCtrl_Regs->iclear = 0xffffffff; |
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153 | |
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154 | /* Init Extended IRQ controller if available */ |
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155 | leon3_ext_irq_init(); |
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156 | |
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157 | /* find GP Timer */ |
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158 | adev = (void *)ambapp_for_each(plb, (OPTIONS_ALL|OPTIONS_APB_SLVS), |
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159 | VENDOR_GAISLER, GAISLER_GPTIMER, |
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160 | ambapp_find_by_idx, &leon3_timer_core_index); |
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161 | if (adev) { |
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162 | LEON3_Timer_Regs = (volatile struct gptimer_regs *)DEV_TO_APB(adev)->start; |
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163 | LEON3_Timer_Adev = adev; |
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164 | |
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165 | /* Register AMBA Bus Frequency */ |
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166 | ambapp_freq_init( |
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167 | plb, |
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168 | LEON3_Timer_Adev, |
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169 | (LEON3_Timer_Regs->scaler_reload + 1) |
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170 | * LEON3_GPTIMER_0_FREQUENCY_SET_BY_BOOT_LOADER |
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171 | ); |
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172 | /* Set user prescaler configuration. Use this to increase accuracy of timer |
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173 | * and accociated services like cpucounter. |
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174 | * Note that minimum value is the number of timer instances present in |
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175 | * GRTIMER/GPTIMER hardware. See HW manual. |
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176 | */ |
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177 | if (leon3_timer_prescaler) |
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178 | LEON3_Timer_Regs->scaler_reload = leon3_timer_prescaler; |
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179 | } |
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180 | } |
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181 | |
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182 | RTEMS_SYSINIT_ITEM( |
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183 | amba_initialize, |
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184 | RTEMS_SYSINIT_BSP_EARLY, |
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185 | RTEMS_SYSINIT_ORDER_MIDDLE |
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186 | ); |
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