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 the micro FB driver for "Bare VGA". It uses the |
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6 | * routines for "bare hardware" that comes with MicroWindows. |
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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 | |
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17 | #include <bsp.h> |
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18 | #include <bsp/irq.h> |
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19 | #include <rtems/libio.h> |
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20 | |
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21 | #include <rtems/mw_fb.h> |
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22 | |
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23 | /* these routines are defined in the microwindows code. This |
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24 | driver is here more as an example of how to implement and |
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25 | use the micro FB interface |
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26 | */ |
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27 | extern void ega_hwinit( void ); |
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28 | extern void ega_hwterm( void ); |
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29 | |
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30 | /* screen information for the VGA driver */ |
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31 | static struct fb_var_screeninfo fb_var = |
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32 | { |
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33 | 640, 480, /* screen size x, y */ |
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34 | 4 /* bits per pixel */ |
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35 | }; |
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36 | |
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37 | static struct fb_fix_screeninfo fb_fix = |
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38 | { |
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39 | (volatile char *)0xA0000, /* buffer pointer */ |
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40 | 0x10000, /* buffer size */ |
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41 | FB_TYPE_VGA_PLANES, /* type of dsplay */ |
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42 | FB_VISUAL_PSEUDOCOLOR, /* color scheme used */ |
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43 | 80 /* chars per line */ |
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44 | }; |
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45 | |
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46 | static uint16_t red16[] = { |
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47 | 0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa, |
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48 | 0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff |
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49 | }; |
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50 | static uint16_t green16[] = { |
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51 | 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa, |
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52 | 0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff |
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53 | }; |
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54 | static uint16_t blue16[] = { |
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55 | 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, |
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56 | 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff |
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57 | }; |
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58 | |
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59 | /* |
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60 | * fbvga device driver INITIALIZE entry point. |
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61 | */ |
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62 | rtems_device_driver |
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63 | fbvga_initialize( rtems_device_major_number major, |
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64 | rtems_device_minor_number minor, |
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65 | void *arg) |
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66 | { |
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67 | rtems_status_code status; |
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68 | |
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69 | printk( "FBVGA -- driver initializing..\n" ); |
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70 | /* |
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71 | * Register the device |
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72 | */ |
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73 | status = rtems_io_register_name ("/dev/fb0", major, 0); |
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74 | if (status != RTEMS_SUCCESSFUL) |
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75 | { |
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76 | printk("Error registering FBVGA device!\n"); |
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77 | rtems_fatal_error_occurred( status ); |
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78 | } |
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79 | return RTEMS_SUCCESSFUL; |
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80 | } |
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81 | |
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82 | /* |
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83 | * fbvga device driver OPEN entry point |
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84 | */ |
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85 | rtems_device_driver |
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86 | fbvga_open( rtems_device_major_number major, |
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87 | rtems_device_minor_number minor, |
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88 | void *arg) |
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89 | { |
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90 | /* rtems_status_code status; */ |
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91 | printk( "FBVGA open called.\n" ); |
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92 | return RTEMS_SUCCESSFUL; |
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93 | } |
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94 | |
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95 | /* |
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96 | * fbvga device driver CLOSE entry point |
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97 | */ |
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98 | rtems_device_driver |
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99 | fbvga_close(rtems_device_major_number major, |
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100 | rtems_device_minor_number minor, |
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101 | void *arg) |
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102 | { |
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103 | printk( "FBVGA close called.\n" ); |
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104 | return RTEMS_SUCCESSFUL; |
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105 | } |
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106 | |
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107 | /* |
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108 | * fbvga device driver READ entry point. |
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109 | * Read characters from the PS/2 mouse. |
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110 | */ |
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111 | rtems_device_driver |
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112 | fbvga_read( rtems_device_major_number major, |
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113 | rtems_device_minor_number minor, |
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114 | void *arg) |
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115 | { |
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116 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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117 | printk( "FBVGA read called.\n" ); |
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118 | rw_args->bytes_moved = 0; |
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119 | return RTEMS_SUCCESSFUL; |
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120 | } |
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121 | |
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122 | /* |
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123 | * fbvga device driver WRITE entry point. |
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124 | * Write characters to the PS/2 mouse. |
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125 | */ |
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126 | rtems_device_driver |
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127 | fbvga_write( rtems_device_major_number major, |
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128 | rtems_device_minor_number minor, |
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129 | void * arg) |
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130 | { |
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131 | rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg; |
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132 | printk( "FBVGA write called.\n" ); |
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133 | rw_args->bytes_moved = 0; |
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134 | return RTEMS_SUCCESSFUL; |
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135 | } |
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136 | |
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137 | static int get_fix_screen_info( struct fb_fix_screeninfo *info ) |
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138 | { |
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139 | *info = fb_fix; |
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140 | return 0; |
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141 | } |
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142 | |
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143 | static int get_var_screen_info( struct fb_var_screeninfo *info ) |
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144 | { |
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145 | *info = fb_var; |
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146 | return 0; |
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147 | } |
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148 | |
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149 | static int get_palette( struct fb_cmap *cmap ) |
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150 | { |
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151 | uint32_t i; |
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152 | |
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153 | if( cmap->start + cmap->len >= 16 ) |
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154 | return 1; |
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155 | |
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156 | for( i = 0; i < cmap->len; i++ ) |
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157 | { |
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158 | cmap->red[ cmap->start + i ] = red16[ cmap->start + i ]; |
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159 | cmap->green[ cmap->start + i ] = green16[ cmap->start + i ]; |
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160 | cmap->blue[ cmap->start + i ] = blue16[ cmap->start + i ]; |
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161 | } |
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162 | return 0; |
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163 | } |
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164 | |
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165 | static int set_palette( struct fb_cmap *cmap ) |
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166 | { |
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167 | uint32_t i; |
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168 | |
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169 | if( cmap->start + cmap->len >= 16 ) |
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170 | return 1; |
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171 | |
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172 | for( i = 0; i < cmap->len; i++ ) |
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173 | { |
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174 | red16[ cmap->start + i ] = cmap->red[ cmap->start + i ]; |
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175 | green16[ cmap->start + i ] = cmap->green[ cmap->start + i ]; |
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176 | blue16[ cmap->start + i ] = cmap->blue[ cmap->start + i ]; |
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177 | } |
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178 | return 0; |
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179 | } |
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180 | |
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181 | /* |
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182 | * IOCTL entry point -- This method is called to carry |
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183 | * all services of this interface. |
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184 | */ |
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185 | rtems_device_driver |
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186 | fbvga_control( rtems_device_major_number major, |
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187 | rtems_device_minor_number minor, |
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188 | void * arg |
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189 | ) |
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190 | { |
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191 | rtems_libio_ioctl_args_t *args = arg; |
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192 | printk( "FBVGA ioctl called, cmd=%x\n", args->command ); |
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193 | switch( args->command ) |
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194 | { |
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195 | case FBIOGET_FSCREENINFO: |
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196 | args->ioctl_return = get_fix_screen_info( args->buffer ); |
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197 | break; |
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198 | case FBIOGET_VSCREENINFO: |
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199 | args->ioctl_return = get_var_screen_info( args->buffer ); |
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200 | break; |
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201 | case FBIOPUT_VSCREENINFO: |
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202 | /* not implemented yet*/ |
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203 | break; |
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204 | case FBIOGETCMAP: |
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205 | args->ioctl_return = get_palette( args->buffer ); |
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206 | break; |
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207 | case FBIOPUTCMAP: |
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208 | args->ioctl_return = set_palette( args->buffer ); |
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209 | break; |
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210 | |
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211 | /* this function would execute one of the routines of the |
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212 | * interface based on the operation requested |
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213 | */ |
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214 | case FB_EXEC_FUNCTION: |
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215 | { |
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216 | struct fb_exec_function *env = args->buffer; |
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217 | switch( env->func_no ) |
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218 | { |
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219 | case FB_FUNC_ENTER_GRAPHICS: |
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220 | /* enter graphics mode*/ |
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221 | ega_hwinit(); |
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222 | break; |
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223 | |
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224 | case FB_FUNC_EXIT_GRAPHICS: |
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225 | /* leave graphics mode*/ |
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226 | ega_hwterm(); |
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227 | break; |
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228 | |
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229 | case FB_FUNC_IS_DIRTY: |
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230 | break; |
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231 | |
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232 | case FB_FUNC_GET_MODE: |
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233 | break; |
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234 | |
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235 | default: |
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236 | break; |
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237 | } |
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238 | } |
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239 | /* no break on purpose */ |
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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 | } |
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245 | return RTEMS_SUCCESSFUL; |
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246 | } |
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