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