[1a3d1f3e] | 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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[0c0ae29] | 10 | * http://www.rtems.com/license/LICENSE. |
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[1a3d1f3e] | 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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[b1cc4ec9] | 16 | #include <rtems/bspIo.h> |
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[1a3d1f3e] | 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 | extern void rtems_irq_mngt_init(void); |
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[4bd22812] | 31 | void bsp_libc_init( void *, uint32_t, int ); |
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[1a3d1f3e] | 32 | |
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| 33 | /**************************************************************************/ |
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| 34 | /* */ |
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| 35 | /* NAME: bsp_pretasking_hook - Function to setup system before startup */ |
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| 36 | /* */ |
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| 37 | /* DESCRIPTION: */ |
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| 38 | /* This function is called before drivers are initialized and used */ |
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| 39 | /* to setup libc and BSP extensions. */ |
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| 40 | /* */ |
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| 41 | /* RESTRICTIONS/LIMITATIONS: */ |
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| 42 | /* Since this function is setting up libc, it cannot use and libc */ |
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| 43 | /* functions. */ |
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| 44 | /* */ |
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| 45 | /**************************************************************************/ |
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| 46 | void bsp_pretasking_hook(void) |
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| 47 | { |
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[4bd22812] | 48 | uint32_t heap_start; |
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| 49 | uint32_t heap_size; |
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[1a3d1f3e] | 50 | |
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| 51 | /* |
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| 52 | * Set up the heap. |
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| 53 | */ |
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| 54 | heap_start = free_mem_start; |
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| 55 | heap_size = free_mem_end - free_mem_start; |
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| 56 | |
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| 57 | /* call rtems lib init - malloc stuff */ |
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| 58 | bsp_libc_init((void *)heap_start, heap_size, 0); |
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| 59 | } |
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| 60 | |
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| 61 | |
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| 62 | /**************************************************************************/ |
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| 63 | /* */ |
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| 64 | /* NAME: bsp_start_default - BSP initialization function */ |
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| 65 | /* */ |
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| 66 | /* DESCRIPTION: */ |
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| 67 | /* This function is called before RTEMS is initialized and used */ |
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| 68 | /* adjust the kernel's configuration. */ |
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| 69 | /* */ |
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| 70 | /* This function also configures the CPU's memory protection unit. */ |
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| 71 | /* */ |
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| 72 | /* RESTRICTIONS/LIMITATIONS: */ |
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| 73 | /* Since RTEMS is not configured, no RTEMS functions can be called. */ |
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| 74 | /* */ |
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| 75 | /**************************************************************************/ |
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[47dbc76] | 76 | void mmu_set_cpu_async_mode(void); |
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[1a3d1f3e] | 77 | void bsp_start_default( void ) |
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| 78 | { |
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[47dbc76] | 79 | int i; |
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| 80 | |
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| 81 | /* Set the MCU prescaler to divide by 1 */ |
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| 82 | MC9328MXL_PLL_CSCR &= ~MC9328MXL_PLL_CSCR_PRESC; |
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| 83 | |
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| 84 | /* Enable the MCU PLL */ |
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| 85 | MC9328MXL_PLL_CSCR |= MC9328MXL_PLL_CSCR_MPEN; |
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| 86 | |
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| 87 | /* Delay to allow time for PLL to get going */ |
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| 88 | for (i = 0; i < 100; i++) { |
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| 89 | asm volatile ("nop\n"); |
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| 90 | } |
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| 91 | |
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| 92 | /* Set the CPU to asynchrous clock mode, so it uses its fastest clock */ |
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| 93 | mmu_set_cpu_async_mode(); |
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[1a3d1f3e] | 94 | |
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| 95 | /* disable interrupts */ |
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| 96 | MC9328MXL_AITC_INTENABLEL = 0; |
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| 97 | MC9328MXL_AITC_INTENABLEH = 0; |
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| 98 | |
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| 99 | /* Set interrupt priority to -1 (allow all priorities) */ |
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| 100 | MC9328MXL_AITC_NIMASK = 0x1f; |
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| 101 | |
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| 102 | /* Place RTEMS workspace at beginning of free memory. */ |
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[4130d8e2] | 103 | Configuration.work_space_start = (void *)&_bss_free_start; |
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[1a3d1f3e] | 104 | |
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[4bd22812] | 105 | free_mem_start = ((uint32_t)&_bss_free_start + |
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[4130d8e2] | 106 | rtems_configuration_get_work_space_size()); |
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[1a3d1f3e] | 107 | |
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[4bd22812] | 108 | free_mem_end = ((uint32_t)&_sdram_base + (uint32_t)&_sdram_size); |
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[1a3d1f3e] | 109 | |
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| 110 | /* |
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| 111 | * Init rtems exceptions management |
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| 112 | */ |
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| 113 | rtems_exception_init_mngt(); |
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| 114 | |
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| 115 | /* |
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| 116 | * Init rtems interrupt management |
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| 117 | */ |
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| 118 | rtems_irq_mngt_init(); |
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| 119 | |
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| 120 | |
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| 121 | /* |
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| 122 | * The following information is very useful when debugging. |
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| 123 | */ |
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| 124 | #if 0 |
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| 125 | printk( "work_space_size = 0x%x\n", |
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[4130d8e2] | 126 | rtems_configuration_get_work_space_size() ); |
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[1a3d1f3e] | 127 | printk( "microseconds_per_tick = 0x%x\n", |
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[4130d8e2] | 128 | rtems_configuration_get_microseconds_per_tick() ); |
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[1a3d1f3e] | 129 | printk( "ticks_per_timeslice = 0x%x\n", |
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[4130d8e2] | 130 | rtems_configuration_get_ticks_per_timeslice() ); |
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[1a3d1f3e] | 131 | printk( "work_space_start = 0x%x\n", |
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[4130d8e2] | 132 | Configuration.work_space_start ); |
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[1a3d1f3e] | 133 | printk( "work_space_size = 0x%x\n", |
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[4130d8e2] | 134 | rtems_configuration_get_work_space_size() ); |
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[1a3d1f3e] | 135 | #endif |
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| 136 | } /* bsp_start */ |
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| 137 | |
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| 138 | |
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| 139 | |
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| 140 | /* Calcuate the frequency for perclk1 */ |
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| 141 | int get_perclk1_freq(void) |
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| 142 | { |
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[47dbc76] | 143 | unsigned int fin; |
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| 144 | unsigned int fpll; |
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| 145 | unsigned int pd; |
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| 146 | unsigned int mfd; |
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| 147 | unsigned int mfi; |
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| 148 | unsigned int mfn; |
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[1a3d1f3e] | 149 | uint32_t reg; |
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| 150 | int perclk1; |
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| 151 | |
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| 152 | if (MC9328MXL_PLL_CSCR & MC9328MXL_PLL_CSCR_SYSSEL) { |
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| 153 | /* Use external oscillator */ |
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| 154 | fin = BSP_OSC_FREQ; |
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| 155 | } else { |
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| 156 | /* Use scaled xtal freq */ |
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| 157 | fin = BSP_XTAL_FREQ * 512; |
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| 158 | } |
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| 159 | |
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| 160 | /* calculate the output of the system PLL */ |
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| 161 | reg = MC9328MXL_PLL_SPCTL0; |
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| 162 | pd = ((reg & MC9328MXL_PLL_SPCTL_PD_MASK) >> |
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| 163 | MC9328MXL_PLL_SPCTL_PD_SHIFT); |
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| 164 | mfd = ((reg & MC9328MXL_PLL_SPCTL_MFD_MASK) >> |
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| 165 | MC9328MXL_PLL_SPCTL_MFD_SHIFT); |
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| 166 | mfi = ((reg & MC9328MXL_PLL_SPCTL_MFI_MASK) >> |
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| 167 | MC9328MXL_PLL_SPCTL_MFI_SHIFT); |
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| 168 | mfn = ((reg & MC9328MXL_PLL_SPCTL_MFN_MASK) >> |
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| 169 | MC9328MXL_PLL_SPCTL_MFN_SHIFT); |
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| 170 | |
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| 171 | #if 0 |
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| 172 | printk("fin = %d\n", fin); |
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| 173 | printk("pd = %d\n", pd); |
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| 174 | printk("mfd = %d\n", mfd); |
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| 175 | printk("mfi = %d\n", mfi); |
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| 176 | printk("mfn = %d\n", mfn); |
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[47dbc76] | 177 | printk("rounded (fin * mfi) / (pd + 1) = %d\n", (fin * mfi) / (pd + 1)); |
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| 178 | printk("rounded (fin * mfn) / ((pd + 1) * (mfd + 1)) = %d\n", |
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| 179 | ((long long)fin * mfn) / ((pd + 1) * (mfd + 1))); |
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[1a3d1f3e] | 180 | #endif |
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| 181 | |
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[47dbc76] | 182 | fpll = 2 * ( ((fin * mfi + (pd + 1) / 2) / (pd + 1)) + |
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| 183 | (((long long)fin * mfn + ((pd + 1) * (mfd + 1)) / 2) / |
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| 184 | ((pd + 1) * (mfd + 1))) ); |
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[1a3d1f3e] | 185 | |
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| 186 | /* calculate the output of the PERCLK1 divider */ |
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| 187 | reg = MC9328MXL_PLL_PCDR; |
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| 188 | perclk1 = fpll / (1 + ((reg & MC9328MXL_PLL_PCDR_PCLK1_MASK) >> |
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| 189 | MC9328MXL_PLL_PCDR_PCLK1_SHIFT)); |
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| 190 | |
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| 191 | return perclk1; |
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| 192 | } |
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| 193 | |
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| 194 | /* |
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| 195 | * By making this a weak alias for bsp_start_default, a brave soul |
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| 196 | * can override the actual bsp_start routine used. |
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| 197 | */ |
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| 198 | |
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| 199 | void bsp_start (void) __attribute__ ((weak, alias("bsp_start_default"))); |
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| 200 | |
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| 201 | |
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| 202 | /** |
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| 203 | * Reset the system. |
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| 204 | * |
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| 205 | * This functions enables the watchdog and waits for it to |
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| 206 | * fire, thus resetting the system. |
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| 207 | */ |
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| 208 | /** |
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| 209 | * Reset the system. |
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| 210 | * |
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| 211 | * This functions enables the watchdog and waits for it to |
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| 212 | * fire, thus resetting the system. |
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| 213 | */ |
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| 214 | void bsp_reset(void) |
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| 215 | { |
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| 216 | rtems_interrupt_level level; |
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| 217 | |
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| 218 | _CPU_ISR_Disable(level); |
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| 219 | |
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| 220 | printk("\n\rI should reset here.\n\r"); |
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| 221 | while(1); |
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| 222 | } |
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