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annotate packages/hal/arm/cma230/current/src/cma230_misc.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents d2c90368aeef
children
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1 //==========================================================================
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2 //
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3 // cma230_misc.c
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4 //
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5 // HAL misc board support code for ARM CMA230-1
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas
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44 // Date: 1999-02-20
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45 // Purpose: HAL board support
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46 // Description: Implementations of HAL board interfaces
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //========================================================================*/
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51
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52 #include <pkgconf/hal.h>
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53
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54 #include <cyg/infra/cyg_type.h> // base types
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55 #include <cyg/infra/cyg_trac.h> // tracing macros
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56 #include <cyg/infra/cyg_ass.h> // assertion macros
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57
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58 #include <cyg/hal/hal_if.h> // calling interface API
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59 #include <cyg/hal/hal_io.h> // IO macros
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60 #include <cyg/hal/hal_arch.h> // Register state info
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61 #include <cyg/hal/hal_diag.h>
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62 #include <cyg/hal/hal_intr.h> // Interrupt names
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63 #include <cyg/hal/hal_cache.h>
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64 #include <cyg/hal/hal_cma230.h> // Hardware definitions
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65
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66 static cyg_uint32 _period;
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67
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68 // Use Timer/Counter #2 for system clock
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69
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70 void hal_clock_initialize(cyg_uint32 period)
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71 {
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72 // Initialize counter
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73 *(volatile cyg_uint16 *)CMA230_TC_ENABLE = 0; // Disable timer
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74 *(volatile cyg_uint16 *)CMA230_TC_CLEAR = 0; // Resets counter
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75 *(volatile cyg_uint16 *)CMA230_TC_PRELOAD = period;
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76 *(volatile cyg_uint16 *)CMA230_TC_ENABLE = 1; // Starts timer
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77 _period = period;
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78 }
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79
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80 // This routine is called during a clock interrupt.
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81
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82 void hal_clock_reset(cyg_uint32 vector, cyg_uint32 period)
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83 {
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84 if (period != _period) {
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85 *(volatile cyg_uint16 *)CMA230_TC_PRELOAD = period;
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86 _period = period;
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87 }
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88 }
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89
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90 // Read the current value of the clock, returning the number of hardware "ticks"
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91 // that have occurred (i.e. how far away the current value is from the start)
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92
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93 void hal_clock_read(cyg_uint32 *pvalue)
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94 {
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95 volatile cyg_int16 *tcct = (volatile cyg_int16 *)CMA230_TC_COUNT;
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96 static cyg_int32 clock_val;
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97 clock_val = *tcct; // Register has only 16 bits
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98 *pvalue = (cyg_uint32)(_period - clock_val); // 'clock_val' counts down and wraps
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99 }
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100
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101 //
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102 // Early stage hardware initialization
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103 // Some initialization has already been done before we get here. For now
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104 // just set up the interrupt environment.
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105
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106 // Note: The hardware interrupt mask (read) doesn't seem to give reliable results.
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107 static cyg_uint8 _imrr;
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108 #undef CMA230_IMRr
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109 #define CMA230_IMRr (&_imrr)
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110
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111 void hal_hardware_init(void)
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112 {
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113 #if 0
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114 // Clear and initialize instruction cache
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115 HAL_ICACHE_INVALIDATE_ALL();
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116 HAL_ICACHE_ENABLE();
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117 #endif
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118 // Any hardware/platform initialization that needs to be done.
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119 // Reset all interrupt masks (disable all interrupt sources)
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120 *(volatile cyg_uint8 *)CMA230_IMRw = 0;
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121 *(volatile cyg_uint8 *)CMA230_CLR = 0xFF; // Clear all current interrupts
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122
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123 // Set up eCos/ROM interfaces
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124 hal_if_init();
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125 }
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126
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127 //
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128 // This routine is called to respond to a hardware interrupt (IRQ). It
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129 // should interrogate the hardware and return the IRQ vector number.
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130
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131 #if 0
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132 // TEMP
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133 int tot_ints;
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134 cyg_uint32 int_PC[2048];
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135 // TEMP
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136 #endif
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137
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138 int hal_IRQ_handler(HAL_SavedRegisters *regs)
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139 {
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140 volatile cyg_uint8 isr = *(volatile cyg_uint8 *)CMA230_ISR;
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141 volatile cyg_uint8 *imrr = (volatile cyg_uint8 *)CMA230_IMRr;
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142 int vector;
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143 isr &= *imrr; // The Interrupt Source Register shows _all_ current
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144 // interrupt sources, not just the enabled ones
152
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145 #if 0
46
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146 // TEMP
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147 int_PC[tot_ints++] = 0xFFFFFFFF;
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148 int_PC[tot_ints++] = isr;
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149 int_PC[tot_ints++] = regs->cpsr;
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150 int_PC[tot_ints++] = regs->pc;
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151 if (tot_ints == 2048) tot_ints = 0;
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152 // TEMP
152
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153 #endif
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154
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155 for (vector = 0; vector < 8; vector++) {
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156 if (isr & (1<<vector)) {
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157 return (vector+1);
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158 }
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159 }
152
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160 return CYGNUM_HAL_INTERRUPT_NONE; // This shouldn't happen!
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161 }
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162
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163 //
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164 // Interrupt control
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165 //
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166
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167 // Disable (mask) an interrupt
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168 void hal_interrupt_mask(int vector)
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169 {
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170 volatile cyg_uint8 *imrr = (volatile cyg_uint8 *)CMA230_IMRr;
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171 volatile cyg_uint8 *imrw = (volatile cyg_uint8 *)CMA230_IMRw;
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172 cyg_uint8 new_mask = *imrr & ~(1<<(vector-1));
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173 *imrw = new_mask;
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174 // TEMP
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175 *imrr = new_mask;
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176 // TEMP
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177 // diag_printf("Mask interrupt #%d - mask: %x\n", vector, *imrr);
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178 }
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179
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180 // Enable (unmask) an interrupt
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181 void hal_interrupt_unmask(int vector)
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182 {
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183 volatile cyg_uint8 *imrr = (volatile cyg_uint8 *)CMA230_IMRr;
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184 volatile cyg_uint8 *imrw = (volatile cyg_uint8 *)CMA230_IMRw;
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185 cyg_uint8 new_mask = *imrr | (1<<(vector-1));
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186 *imrw = new_mask;
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187 // TEMP
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188 *imrr = new_mask;
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189 // TEMP
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190 // diag_printf("Unmask interrupt #%d - mask: %x\n", vector, *imrr);
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191 }
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192
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193 void hal_interrupt_acknowledge(int vector)
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194 {
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195 // These two vectors are "sticky" and must be reset
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196 if ((vector == CYGNUM_HAL_INTERRUPT_TIMER) ||
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197 (vector == CYGNUM_HAL_INTERRUPT_ABORT)) {
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198 *(volatile cyg_uint8 *)CMA230_CLR = (1<<(vector-1));
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199 }
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200 }
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201
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202 void hal_interrupt_configure(int vector, int level, int up)
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203 {
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204 // No interrupts are configurable on this hardware
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205 }
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206
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207 void hal_interrupt_set_level(int vector, int level)
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208 {
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209 // No interrupts are configurable on this hardware
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210 }
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211
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212 /*------------------------------------------------------------------------*/
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213 // EOF hal_misc.c