1 | /** |
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2 | * @file |
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3 | * |
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4 | * LEON3 SMP BSP Support |
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5 | */ |
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6 | |
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7 | /* |
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8 | * COPYRIGHT (c) 1989-2011. |
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9 | * On-Line Applications Research Corporation (OAR). |
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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 | * http://www.rtems.com/license/LICENSE. |
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14 | */ |
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15 | |
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16 | #include <rtems.h> |
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17 | #include <bsp.h> |
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18 | #include <rtems/bspIo.h> |
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19 | #include <rtems/bspsmp.h> |
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20 | #include <stdlib.h> |
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21 | |
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22 | #define RTEMS_DEBUG |
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23 | |
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24 | static inline void sparc_leon3_set_cctrl( unsigned int val ) |
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25 | { |
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26 | __asm__ volatile( "sta %0, [%%g0] 2" : : "r" (val) ); |
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27 | } |
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28 | |
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29 | static inline unsigned int sparc_leon3_get_cctrl( void ) |
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30 | { |
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31 | unsigned int v = 0; |
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32 | __asm__ volatile( "lda [%%g0] 2, %0" : "=r" (v) : "0" (v) ); |
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33 | return v; |
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34 | } |
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35 | |
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36 | rtems_isr bsp_ap_ipi_isr( |
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37 | rtems_vector_number vector |
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38 | ) |
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39 | { |
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40 | LEON_Clear_interrupt(LEON3_MP_IRQ); |
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41 | rtems_smp_process_interrupt(); |
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42 | } |
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43 | |
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44 | static void leon3_secondary_cpu_initialize(void) |
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45 | { |
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46 | int cpu = bsp_smp_processor_id(); |
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47 | |
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48 | sparc_leon3_set_cctrl( 0x80000F ); |
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49 | LEON_Unmask_interrupt(LEON3_MP_IRQ); |
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50 | LEON3_IrqCtrl_Regs->mask[cpu] |= 1 << LEON3_MP_IRQ; |
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51 | |
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52 | rtems_smp_secondary_cpu_initialize(); |
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53 | } |
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54 | |
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55 | /* |
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56 | * Used to pass information to start.S when bringing secondary CPUs |
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57 | * out of reset. |
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58 | */ |
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59 | void *bsp_ap_stack; |
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60 | void *bsp_ap_entry; |
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61 | |
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62 | static void bsp_smp_delay( int ); |
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63 | |
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64 | uint32_t bsp_smp_initialize( uint32_t configured_cpu_count ) |
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65 | { |
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66 | uint32_t cpu; |
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67 | uint32_t found_cpus = 0; |
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68 | |
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69 | sparc_leon3_set_cctrl( 0x80000F ); |
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70 | found_cpus = |
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71 | ((LEON3_IrqCtrl_Regs->mpstat >> LEON3_IRQMPSTATUS_CPUNR) & 0xf) + 1; |
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72 | #if defined(RTEMS_DEBUG) |
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73 | printk( "Found %d CPUs\n", found_cpus ); |
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74 | #endif |
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75 | |
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76 | if ( found_cpus > configured_cpu_count ) { |
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77 | printk( |
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78 | "%d CPUs IS MORE THAN CONFIGURED -- ONLY USING %d\n", |
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79 | found_cpus, |
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80 | configured_cpu_count |
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81 | ); |
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82 | found_cpus = configured_cpu_count; |
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83 | } |
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84 | |
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85 | if ( found_cpus == 1 ) |
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86 | return 1; |
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87 | |
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88 | for ( cpu=1 ; cpu < found_cpus ; cpu++ ) { |
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89 | |
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90 | #if defined(RTEMS_DEBUG) |
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91 | printk( "Waking CPU %d\n", cpu ); |
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92 | #endif |
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93 | |
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94 | bsp_ap_stack = _Per_CPU_Information[cpu].interrupt_stack_high - |
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95 | CPU_MINIMUM_STACK_FRAME_SIZE; |
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96 | bsp_ap_entry = leon3_secondary_cpu_initialize; |
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97 | |
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98 | LEON3_IrqCtrl_Regs->mpstat = 1 << cpu; |
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99 | bsp_smp_delay( 1000000 ); |
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100 | #if defined(RTEMS_DEBUG) |
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101 | printk( |
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102 | "CPU %d is %s\n", |
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103 | cpu, |
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104 | ((_Per_CPU_Information[cpu].state == RTEMS_BSP_SMP_CPU_INITIALIZED) ? |
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105 | "online" : "offline") |
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106 | ); |
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107 | #endif |
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108 | } |
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109 | |
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110 | if ( found_cpus > 1 ) { |
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111 | LEON_Unmask_interrupt(LEON3_MP_IRQ); |
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112 | set_vector(bsp_ap_ipi_isr, LEON_TRAP_TYPE(LEON3_MP_IRQ), 1); |
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113 | } |
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114 | return found_cpus; |
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115 | } |
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116 | |
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117 | void bsp_smp_interrupt_cpu( |
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118 | int cpu |
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119 | ) |
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120 | { |
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121 | /* send interrupt to destination CPU */ |
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122 | LEON3_IrqCtrl_Regs->force[cpu] = 1 << LEON3_MP_IRQ; |
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123 | } |
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124 | |
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125 | void bsp_smp_broadcast_interrupt(void) |
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126 | { |
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127 | int dest_cpu; |
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128 | int cpu; |
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129 | int max_cpus; |
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130 | |
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131 | cpu = bsp_smp_processor_id(); |
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132 | max_cpus = rtems_smp_get_number_of_processors(); |
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133 | |
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134 | for ( dest_cpu=0 ; dest_cpu < max_cpus ; dest_cpu++ ) { |
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135 | if ( cpu == dest_cpu ) |
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136 | continue; |
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137 | bsp_smp_interrupt_cpu( dest_cpu ); |
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138 | /* this is likely needed due to the ISR code not being SMP aware yet */ |
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139 | bsp_smp_delay( 100000 ); |
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140 | } |
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141 | } |
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142 | |
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143 | extern __inline__ void __delay(unsigned long loops) |
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144 | { |
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145 | __asm__ __volatile__("cmp %0, 0\n\t" |
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146 | "1: bne 1b\n\t" |
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147 | "subcc %0, 1, %0\n" : |
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148 | "=&r" (loops) : |
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149 | "0" (loops) : |
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150 | "cc" |
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151 | ); |
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152 | } |
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153 | |
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154 | /* |
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155 | * Kill time without depending on the timer being present or programmed. |
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156 | * |
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157 | * This is not very sophisticated. |
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158 | */ |
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159 | void bsp_smp_delay( int max ) |
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160 | { |
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161 | __delay( max ); |
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162 | } |
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163 | |
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164 | void bsp_smp_wait_for( |
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165 | volatile unsigned int *address, |
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166 | unsigned int desired, |
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167 | int maximum_usecs |
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168 | ) |
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169 | { |
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170 | int iterations; |
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171 | volatile unsigned int *p = address; |
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172 | |
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173 | for (iterations=0 ; iterations < maximum_usecs ; iterations++ ) { |
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174 | if ( *p == desired ) |
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175 | break; |
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176 | bsp_smp_delay( 5000 ); |
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177 | } |
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178 | } |
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179 | |
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180 | |
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