1 | /* framebuffer.c |
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2 | * |
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3 | * This file is the framebuffer driver for the Milkymist VGA IP-core |
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4 | * This VGA Core is a part of Milkymist System-on-Chip |
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5 | * |
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6 | * The license and distribution terms for this file may be |
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7 | * found in the file LICENSE in this distribution or at |
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8 | * http://www.rtems.org/license/LICENSE. |
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9 | * |
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10 | * COPYRIGHT (c) Yann Sionneau <yann.sionneau@telecom-sudparis.eu> (GSoC 2010) |
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11 | * Telecom SudParis |
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12 | * Copyright (c) 2011 Sebastien Bourdeauducq |
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13 | */ |
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14 | |
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15 | #include <stdlib.h> |
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16 | #include <stdio.h> |
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17 | #include <string.h> |
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18 | #include <errno.h> |
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19 | #include <sys/types.h> |
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20 | #include <rtems.h> |
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21 | #include <bsp.h> |
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22 | #include "../include/system_conf.h" |
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23 | #include <rtems/libio.h> |
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24 | #include <rtems/fb.h> |
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25 | #include <rtems/framebuffer.h> |
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26 | #include <rtems/bspIo.h> |
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27 | |
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28 | static unsigned short int framebufferA[1024*768] |
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29 | __attribute__((aligned(32))); |
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30 | static unsigned short int framebufferB[1024*768] |
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31 | __attribute__((aligned(32))); |
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32 | static unsigned short int framebufferC[1024*768] |
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33 | __attribute__((aligned(32))); |
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34 | |
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35 | static unsigned short int *frontbuffer; |
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36 | static unsigned short int *backbuffer; |
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37 | static unsigned short int *lastbuffer; |
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38 | |
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39 | static struct fb_var_screeninfo fb_var = { |
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40 | .xres = 640, |
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41 | .yres = 480, |
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42 | .bits_per_pixel = 16 |
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43 | }; |
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44 | |
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45 | static struct fb_fix_screeninfo fb_fix = { |
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46 | .smem_len = 1024 * 768 * 2, |
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47 | .type = FB_TYPE_VGA_PLANES, |
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48 | .visual = FB_VISUAL_TRUECOLOR, |
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49 | .line_length = 80 |
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50 | }; |
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51 | |
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52 | static int get_fix_screen_info( struct fb_fix_screeninfo *info ) |
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53 | { |
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54 | *info = fb_fix; |
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55 | return 0; |
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56 | } |
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57 | |
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58 | static int get_var_screen_info( struct fb_var_screeninfo *info ) |
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59 | { |
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60 | *info = fb_var; |
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61 | return 0; |
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62 | } |
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63 | |
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64 | static void init_buffers(void) |
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65 | { |
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66 | frontbuffer = framebufferA; |
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67 | backbuffer = framebufferB; |
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68 | lastbuffer = framebufferC; |
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69 | } |
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70 | |
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71 | static void swap_buffers(void) |
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72 | { |
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73 | unsigned short int *p; |
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74 | |
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75 | /* Make sure last buffer swap has been executed */ |
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76 | while (MM_READ(MM_VGA_BASEADDRESS_ACT) != MM_READ(MM_VGA_BASEADDRESS)); |
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77 | |
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78 | p = frontbuffer; |
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79 | frontbuffer = backbuffer; |
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80 | backbuffer = lastbuffer; |
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81 | lastbuffer = p; |
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82 | |
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83 | fb_fix.smem_start = (volatile char *)backbuffer; |
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84 | MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer); |
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85 | } |
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86 | |
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87 | static void set_video_mode(int mode) |
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88 | { |
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89 | int hres, vres; |
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90 | |
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91 | MM_WRITE(MM_VGA_RESET, VGA_RESET); |
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92 | hres = vres = 0; |
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93 | switch(mode) { |
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94 | case 0: // 640x480, pixel clock: 25MHz |
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95 | hres = 640; |
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96 | vres = 480; |
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97 | MM_WRITE(MM_VGA_HSYNC_START, 656); |
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98 | MM_WRITE(MM_VGA_HSYNC_END, 752); |
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99 | MM_WRITE(MM_VGA_HSCAN, 799); |
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100 | MM_WRITE(MM_VGA_VSYNC_START, 492); |
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101 | MM_WRITE(MM_VGA_VSYNC_END, 494); |
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102 | MM_WRITE(MM_VGA_VSCAN, 524); |
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103 | MM_WRITE(MM_VGA_CLKSEL, 0); |
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104 | break; |
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105 | case 1: // 800x600, pixel clock: 50MHz |
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106 | hres = 800; |
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107 | vres = 600; |
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108 | MM_WRITE(MM_VGA_HSYNC_START, 848); |
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109 | MM_WRITE(MM_VGA_HSYNC_END, 976); |
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110 | MM_WRITE(MM_VGA_HSCAN, 1040); |
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111 | MM_WRITE(MM_VGA_VSYNC_START, 636); |
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112 | MM_WRITE(MM_VGA_VSYNC_END, 642); |
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113 | MM_WRITE(MM_VGA_VSCAN, 665); |
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114 | MM_WRITE(MM_VGA_CLKSEL, 1); |
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115 | break; |
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116 | case 2: // 1024x768, pixel clock: 65MHz |
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117 | hres = 1024; |
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118 | vres = 768; |
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119 | MM_WRITE(MM_VGA_HSYNC_START, 1048); |
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120 | MM_WRITE(MM_VGA_HSYNC_END, 1184); |
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121 | MM_WRITE(MM_VGA_HSCAN, 1344); |
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122 | MM_WRITE(MM_VGA_VSYNC_START, 772); |
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123 | MM_WRITE(MM_VGA_VSYNC_END, 778); |
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124 | MM_WRITE(MM_VGA_VSCAN, 807); |
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125 | MM_WRITE(MM_VGA_CLKSEL, 2); |
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126 | break; |
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127 | } |
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128 | if((hres != 0) && (vres != 0)) { |
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129 | MM_WRITE(MM_VGA_HRES, hres); |
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130 | MM_WRITE(MM_VGA_VRES, vres); |
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131 | fb_var.xres = hres; |
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132 | fb_var.yres = vres; |
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133 | memset(framebufferA, 0, hres*vres*2); |
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134 | memset(framebufferB, 0, hres*vres*2); |
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135 | memset(framebufferC, 0, hres*vres*2); |
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136 | MM_WRITE(MM_VGA_BURST_COUNT, hres*vres/16); |
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137 | MM_WRITE(MM_VGA_RESET, 0); |
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138 | } /* otherwise, leave the VGA controller in reset */ |
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139 | } |
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140 | |
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141 | rtems_device_driver frame_buffer_initialize( |
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142 | rtems_device_major_number major, |
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143 | rtems_device_minor_number minor, |
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144 | void *arg |
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145 | ) |
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146 | { |
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147 | rtems_status_code status; |
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148 | |
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149 | init_buffers(); |
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150 | fb_fix.smem_start = (volatile char *)frontbuffer; |
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151 | MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer); |
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152 | |
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153 | status = rtems_io_register_name(FRAMEBUFFER_DEVICE_0_NAME, major, 0); |
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154 | if (status != RTEMS_SUCCESSFUL) { |
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155 | printk("Error registering frame buffer device!\n"); |
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156 | rtems_fatal_error_occurred( status ); |
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157 | } |
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158 | |
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159 | return RTEMS_SUCCESSFUL; |
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160 | } |
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161 | |
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162 | rtems_device_driver frame_buffer_close( |
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163 | rtems_device_major_number major, |
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164 | rtems_device_minor_number minor, |
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165 | void *arg |
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166 | ) |
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167 | { |
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168 | return RTEMS_SUCCESSFUL; |
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169 | } |
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170 | |
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171 | rtems_device_driver frame_buffer_open( |
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172 | rtems_device_major_number major, |
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173 | rtems_device_minor_number minor, |
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174 | void *arg |
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175 | ) |
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176 | { |
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177 | return RTEMS_SUCCESSFUL; |
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178 | } |
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179 | |
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180 | rtems_device_driver frame_buffer_read( |
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181 | rtems_device_major_number major, |
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182 | rtems_device_minor_number minor, |
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183 | void *arg |
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184 | ) |
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185 | { |
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186 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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187 | rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len) |
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188 | ? (fb_fix.smem_len - rw_args->offset) : rw_args->count; |
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189 | memcpy(rw_args->buffer, (const void *)(fb_fix.smem_start + rw_args->offset), |
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190 | rw_args->bytes_moved); |
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191 | return RTEMS_SUCCESSFUL; |
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192 | } |
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193 | |
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194 | rtems_device_driver frame_buffer_write( |
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195 | rtems_device_major_number major, |
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196 | rtems_device_minor_number minor, |
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197 | void *arg |
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198 | ) |
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199 | { |
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200 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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201 | rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len) |
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202 | ? (fb_fix.smem_len - rw_args->offset) : rw_args->count; |
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203 | memcpy((void *)(fb_fix.smem_start + rw_args->offset), rw_args->buffer, |
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204 | rw_args->bytes_moved); |
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205 | return RTEMS_SUCCESSFUL; |
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206 | } |
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207 | |
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208 | rtems_device_driver frame_buffer_control( |
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209 | rtems_device_major_number major, |
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210 | rtems_device_minor_number minor, |
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211 | void *arg |
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212 | ) |
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213 | { |
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214 | rtems_libio_ioctl_args_t *args = arg; |
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215 | |
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216 | switch (args->command) { |
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217 | case FBIOGET_FSCREENINFO: |
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218 | args->ioctl_return = |
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219 | get_fix_screen_info((struct fb_fix_screeninfo *)args->buffer); |
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220 | return RTEMS_SUCCESSFUL; |
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221 | case FBIOGET_VSCREENINFO: |
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222 | args->ioctl_return = |
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223 | get_var_screen_info((struct fb_var_screeninfo *)args->buffer); |
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224 | return RTEMS_SUCCESSFUL; |
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225 | case FBIOSWAPBUFFERS: |
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226 | swap_buffers(); |
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227 | args->ioctl_return = 0; |
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228 | return RTEMS_SUCCESSFUL; |
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229 | case FBIOSETBUFFERMODE: |
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230 | args->ioctl_return = 0; |
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231 | switch ((unsigned int)args->buffer) { |
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232 | case FB_SINGLE_BUFFERED: |
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233 | init_buffers(); |
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234 | fb_fix.smem_start = (volatile char *)frontbuffer; |
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235 | MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer); |
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236 | return RTEMS_SUCCESSFUL; |
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237 | case FB_TRIPLE_BUFFERED: |
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238 | fb_fix.smem_start = (volatile char *)backbuffer; |
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239 | return RTEMS_SUCCESSFUL; |
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240 | default: |
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241 | return RTEMS_UNSATISFIED; |
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242 | } |
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243 | case FBIOSETVIDEOMODE: |
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244 | set_video_mode((int)args->buffer); |
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245 | return RTEMS_SUCCESSFUL; |
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246 | default: |
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247 | args->ioctl_return = -1; |
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248 | return RTEMS_UNSATISFIED; |
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249 | } |
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250 | } |
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251 | |
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