1 | /* |
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2 | * This routine does the bulk of the system initialization. |
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3 | */ |
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4 | |
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5 | /* |
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6 | * COPYRIGHT (c) 1989-2007. |
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7 | * On-Line Applications Research Corporation (OAR). |
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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 | * SS555 port sponsored by Defence Research and Development Canada - Suffield |
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14 | * Copyright (C) 2004, Real-Time Systems Inc. (querbach@realtime.bc.ca) |
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15 | * |
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16 | * Derived from c/src/lib/libbsp/powerpc/mbx8xx/startup/bspstart.c: |
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17 | * |
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18 | * Modifications for MBX860: |
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19 | * Copyright (c) 1999, National Research Council of Canada |
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20 | */ |
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21 | |
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22 | #warning The interrupt disable mask is now stored in SPRG0, please verify that this is compatible to this BSP (see also bootcard.c). |
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23 | |
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24 | #include <rtems/bspIo.h> |
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25 | #include <rtems/counter.h> |
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26 | #include <bsp/bootcard.h> |
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27 | #include <rtems/powerpc/powerpc.h> |
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28 | |
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29 | #include <libcpu/cpuIdent.h> |
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30 | #include <libcpu/spr.h> |
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31 | |
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32 | #include <bsp/irq.h> |
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33 | #include <bsp.h> |
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34 | |
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35 | SPR_RW(SPRG1) |
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36 | |
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37 | extern unsigned long intrStackPtr; |
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38 | |
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39 | /* |
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40 | * Driver configuration parameters |
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41 | */ |
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42 | uint32_t bsp_clicks_per_usec; |
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43 | uint32_t bsp_clock_speed; /* Serial clocks per second */ |
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44 | uint32_t bsp_timer_least_valid; |
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45 | uint32_t bsp_timer_average_overhead; |
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46 | |
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47 | void BSP_panic(char *s) |
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48 | { |
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49 | printk("%s PANIC %s\n",_RTEMS_version, s); |
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50 | __asm__ __volatile ("sc"); |
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51 | } |
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52 | |
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53 | void _BSP_Fatal_error(unsigned int v) |
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54 | { |
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55 | printk("%s PANIC ERROR %x\n",_RTEMS_version, v); |
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56 | __asm__ __volatile ("sc"); |
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57 | } |
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58 | |
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59 | /* |
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60 | * bsp_start() |
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61 | * |
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62 | * Board-specific initialization code. Called from the generic boot_card() |
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63 | * function defined in rtems/c/src/lib/libbsp/shared/main.c. That function |
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64 | * does some of the board independent initialization. It is called from the |
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65 | * SS555 entry point _start() defined in |
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66 | * rtems/c/src/lib/libbsp/powerpc/ss555/start/start.S |
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67 | * |
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68 | * _start() has set up a stack, has zeroed the .bss section, has set up the |
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69 | * .data section from contents stored in ROM, has turned off interrupts, |
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70 | * and placed the processor in the supervisor mode. boot_card() has left |
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71 | * the processor in that state when bsp_start() was called. |
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72 | * |
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73 | * Input parameters: NONE |
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74 | * |
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75 | * Output parameters: NONE |
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76 | * |
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77 | * Return values: NONE |
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78 | */ |
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79 | void bsp_start(void) |
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80 | { |
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81 | ppc_cpu_id_t myCpu; |
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82 | ppc_cpu_revision_t myCpuRevision; |
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83 | register unsigned char* intrStack; |
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84 | |
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85 | /* |
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86 | * Get CPU identification dynamically. Note that the get_ppc_cpu_type() |
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87 | * function stores the result in global variables so that it can be used |
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88 | * later. |
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89 | */ |
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90 | myCpu = get_ppc_cpu_type(); |
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91 | myCpuRevision = get_ppc_cpu_revision(); |
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92 | |
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93 | /* |
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94 | * Initialize some SPRG registers related to irq handling |
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95 | */ |
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96 | intrStack = (((unsigned char*)&intrStackPtr) - PPC_MINIMUM_STACK_FRAME_SIZE); |
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97 | _write_SPRG1((unsigned int)intrStack); |
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98 | |
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99 | /* |
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100 | * Install our own set of exception vectors |
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101 | */ |
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102 | initialize_exceptions(); |
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103 | |
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104 | /* |
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105 | * initialize the device driver parameters |
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106 | */ |
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107 | bsp_clicks_per_usec = BSP_CRYSTAL_HZ / 4 / 1000000; |
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108 | bsp_clock_speed = BSP_CLOCK_HZ; /* for SCI baud rate generator */ |
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109 | bsp_timer_least_valid = 0; |
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110 | bsp_timer_average_overhead = 0; |
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111 | rtems_counter_initialize_converter(BSP_CRYSTAL_HZ / 4); |
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112 | |
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113 | /* |
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114 | * Initalize RTEMS IRQ system |
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115 | */ |
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116 | BSP_rtems_irq_mng_init(0); |
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117 | } |
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