1 | /* |
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2 | * Copyright (c) 2000 - Rosimildo da Silva ( rdasilva@connecttel.com ) |
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3 | * |
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4 | * MODULE DESCRIPTION: |
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5 | * This module implements FB driver for "Bare VGA". It uses the |
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6 | * routines for "bare hardware" found in vgainit.c. |
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7 | * |
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8 | * $Id$ |
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9 | * |
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10 | */ |
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11 | |
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12 | #include <stdlib.h> |
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13 | #include <stdio.h> |
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14 | #include <errno.h> |
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15 | #include <sys/types.h> |
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16 | #include <pthread.h> |
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17 | |
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18 | #include <bsp.h> |
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19 | #include <bsp/irq.h> |
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20 | #include <rtems/libio.h> |
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21 | |
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22 | #include <rtems/fb.h> |
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23 | |
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24 | /* these routines are defined in vgainit.c.*/ |
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25 | extern void ega_hwinit( void ); |
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26 | extern void ega_hwterm( void ); |
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27 | |
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28 | /* mutex attribure */ |
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29 | pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER; |
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30 | |
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31 | /* screen information for the VGA driver */ |
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32 | static struct fb_var_screeninfo fb_var = |
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33 | { |
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34 | .xres = 640, |
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35 | .yres = 480, |
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36 | .bits_per_pixel = 4 |
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37 | }; |
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38 | |
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39 | static struct fb_fix_screeninfo fb_fix = |
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40 | { |
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41 | .smem_start = (volatile char *)0xA0000, /* buffer pointer */ |
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42 | .smem_len = 0x10000, /* buffer size */ |
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43 | .type = FB_TYPE_VGA_PLANES, /* type of dsplay */ |
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44 | .visual = FB_VISUAL_PSEUDOCOLOR, /* color scheme used */ |
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45 | .line_length = 80 /* chars per line */ |
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46 | }; |
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47 | |
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48 | |
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49 | static uint16_t red16[] = { |
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50 | 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa, |
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51 | 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff |
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52 | }; |
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53 | static uint16_t green16[] = { |
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54 | 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa, |
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55 | 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff |
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56 | }; |
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57 | static uint16_t blue16[] = { |
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58 | 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, |
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59 | 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff |
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60 | }; |
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61 | |
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62 | /* Functionality to support multiple VGA frame buffers can be added easily, |
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63 | * but is not supported at this moment because there is no need for two or |
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64 | * more "classic" VGA adapters. Multiple frame buffer drivers may be |
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65 | * implemented and If we had implement it they would be named as "/dev/fb0", |
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66 | * "/dev/fb1", "/dev/fb2" and so on. |
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67 | */ |
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68 | /* |
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69 | * fbvga device driver INITIALIZE entry point. |
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70 | */ |
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71 | rtems_device_driver frame_buffer_initialize( |
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72 | rtems_device_major_number major, |
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73 | rtems_device_minor_number minor, |
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74 | void *arg |
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75 | ) |
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76 | { |
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77 | rtems_status_code status; |
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78 | |
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79 | printk( "FBVGA -- driver initializing..\n" ); |
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80 | |
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81 | /* |
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82 | * Register the device |
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83 | */ |
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84 | status = rtems_io_register_name ("/dev/fb0", major, 0); |
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85 | if (status != RTEMS_SUCCESSFUL) { |
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86 | printk("Error registering /dev/fb0 FBVGA framebuffer device!\n"); |
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87 | rtems_fatal_error_occurred( status ); |
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88 | } |
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89 | |
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90 | return RTEMS_SUCCESSFUL; |
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91 | } |
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92 | |
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93 | /* |
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94 | * fbvga device driver OPEN entry point |
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95 | */ |
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96 | rtems_device_driver frame_buffer_open( |
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97 | rtems_device_major_number major, |
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98 | rtems_device_minor_number minor, |
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99 | void *arg |
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100 | ) |
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101 | { |
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102 | if (pthread_mutex_trylock(&mutex)== 0){ |
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103 | /* restore previous state. for VGA this means return to text mode. |
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104 | * leave out if graphics hardware has been initialized in |
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105 | * frame_buffer_initialize() |
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106 | */ |
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107 | ega_hwinit(); |
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108 | printk( "FBVGA open called.\n" ); |
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109 | return RTEMS_SUCCESSFUL; |
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110 | } |
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111 | |
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112 | return RTEMS_UNSATISFIED; |
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113 | } |
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114 | |
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115 | /* |
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116 | * fbvga device driver CLOSE entry point |
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117 | */ |
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118 | rtems_device_driver frame_buffer_close( |
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119 | rtems_device_major_number major, |
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120 | rtems_device_minor_number minor, |
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121 | void *arg |
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122 | ) |
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123 | { |
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124 | if (pthread_mutex_unlock(&mutex) == 0){ |
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125 | /* restore previous state. for VGA this means return to text mode. |
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126 | * leave out if graphics hardware has been initialized in |
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127 | * frame_buffer_initialize() */ |
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128 | ega_hwterm(); |
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129 | printk( "FBVGA close called.\n" ); |
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130 | return RTEMS_SUCCESSFUL; |
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131 | } |
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132 | |
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133 | return RTEMS_UNSATISFIED; |
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134 | } |
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135 | |
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136 | /* |
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137 | * fbvga device driver READ entry point. |
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138 | */ |
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139 | rtems_device_driver frame_buffer_read( |
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140 | rtems_device_major_number major, |
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141 | rtems_device_minor_number minor, |
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142 | void *arg |
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143 | ) |
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144 | { |
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145 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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146 | rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len ) ? (fb_fix.smem_len - rw_args->offset) : rw_args->count; |
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147 | memcpy(rw_args->buffer, (const void *) (fb_fix.smem_start + rw_args->offset), rw_args->bytes_moved); |
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148 | return RTEMS_SUCCESSFUL; |
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149 | } |
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150 | |
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151 | /* |
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152 | * frame_buffer device driver WRITE entry point. |
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153 | */ |
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154 | rtems_device_driver frame_buffer_write( |
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155 | rtems_device_major_number major, |
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156 | rtems_device_minor_number minor, |
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157 | void *arg |
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158 | ) |
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159 | { |
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160 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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161 | rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len ) ? (fb_fix.smem_len - rw_args->offset) : rw_args->count; |
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162 | memcpy( (void *) (fb_fix.smem_start + rw_args->offset), rw_args->buffer, rw_args->bytes_moved); |
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163 | return RTEMS_SUCCESSFUL; |
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164 | } |
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165 | |
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166 | static int get_fix_screen_info( struct fb_fix_screeninfo *info ) |
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167 | { |
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168 | *info = fb_fix; |
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169 | return 0; |
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170 | } |
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171 | |
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172 | static int get_var_screen_info( struct fb_var_screeninfo *info ) |
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173 | { |
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174 | *info = fb_var; |
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175 | return 0; |
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176 | } |
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177 | |
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178 | static int get_palette( struct fb_cmap *cmap ) |
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179 | { |
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180 | uint32_t i; |
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181 | |
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182 | if ( cmap->start + cmap->len >= 16 ) |
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183 | return 1; |
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184 | |
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185 | for( i = 0; i < cmap->len; i++ ) { |
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186 | cmap->red[ cmap->start + i ] = red16[ cmap->start + i ]; |
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187 | cmap->green[ cmap->start + i ] = green16[ cmap->start + i ]; |
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188 | cmap->blue[ cmap->start + i ] = blue16[ cmap->start + i ]; |
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189 | } |
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190 | return 0; |
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191 | } |
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192 | |
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193 | static int set_palette( struct fb_cmap *cmap ) |
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194 | { |
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195 | uint32_t i; |
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196 | |
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197 | if ( cmap->start + cmap->len >= 16 ) |
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198 | return 1; |
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199 | |
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200 | for( i = 0; i < cmap->len; i++ ) { |
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201 | red16[ cmap->start + i ] = cmap->red[ cmap->start + i ]; |
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202 | green16[ cmap->start + i ] = cmap->green[ cmap->start + i ]; |
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203 | blue16[ cmap->start + i ] = cmap->blue[ cmap->start + i ]; |
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204 | } |
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205 | return 0; |
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206 | } |
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207 | |
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208 | /* |
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209 | * IOCTL entry point -- This method is called to carry |
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210 | * all services of this interface. |
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211 | */ |
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212 | rtems_device_driver frame_buffer_control( |
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213 | rtems_device_major_number major, |
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214 | rtems_device_minor_number minor, |
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215 | void *arg |
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216 | ) |
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217 | { |
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218 | rtems_libio_ioctl_args_t *args = arg; |
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219 | |
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220 | printk( "FBVGA ioctl called, cmd=%x\n", args->command ); |
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221 | |
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222 | switch( args->command ) { |
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223 | case FBIOGET_FSCREENINFO: |
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224 | args->ioctl_return = get_fix_screen_info( ( struct fb_fix_screeninfo * ) args->buffer ); |
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225 | break; |
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226 | case FBIOGET_VSCREENINFO: |
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227 | args->ioctl_return = get_var_screen_info( ( struct fb_var_screeninfo * ) args->buffer ); |
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228 | break; |
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229 | case FBIOPUT_VSCREENINFO: |
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230 | /* not implemented yet*/ |
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231 | args->ioctl_return = -1; |
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232 | return RTEMS_UNSATISFIED; |
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233 | case FBIOGETCMAP: |
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234 | args->ioctl_return = get_palette( ( struct fb_cmap * ) args->buffer ); |
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235 | break; |
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236 | case FBIOPUTCMAP: |
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237 | args->ioctl_return = set_palette( ( struct fb_cmap * ) args->buffer ); |
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238 | break; |
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239 | |
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240 | default: |
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241 | args->ioctl_return = 0; |
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242 | break; |
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243 | } |
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244 | return RTEMS_SUCCESSFUL; |
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245 | } |
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