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/*
* Copyright (c) 2000 - Rosimildo da Silva ( rdasilva@connecttel.com )
*
* MODULE DESCRIPTION:
* This module implements FB driver for "Bare VGA". It uses the
* routines for "bare hardware" found in vgainit.c.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <pthread.h>
#include <bsp.h>
#include <bsp/irq.h>
#include <rtems/libio.h>
#include <rtems/fb.h>
/* these routines are defined in vgainit.c.*/
extern void ega_hwinit( void );
extern void ega_hwterm( void );
/* mutex attribure */
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/* screen information for the VGA driver */
static struct fb_var_screeninfo fb_var =
{
.xres = 640,
.yres = 480,
.bits_per_pixel = 4
};
static struct fb_fix_screeninfo fb_fix =
{
.smem_start = (volatile char *)0xA0000, /* buffer pointer */
.smem_len = 0x10000, /* buffer size */
.type = FB_TYPE_VGA_PLANES, /* type of dsplay */
.visual = FB_VISUAL_PSEUDOCOLOR, /* color scheme used */
.line_length = 80 /* chars per line */
};
static uint16_t red16[] = {
0x0000, 0x0000, 0x0000, 0x0000, 0xaaaa, 0xaaaa, 0xaaaa, 0xaaaa,
0x5555, 0x5555, 0x5555, 0x5555, 0xffff, 0xffff, 0xffff, 0xffff
};
static uint16_t green16[] = {
0x0000, 0x0000, 0xaaaa, 0xaaaa, 0x0000, 0x0000, 0x5555, 0xaaaa,
0x5555, 0x5555, 0xffff, 0xffff, 0x5555, 0x5555, 0xffff, 0xffff
};
static uint16_t blue16[] = {
0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa, 0x0000, 0xaaaa,
0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff, 0x5555, 0xffff
};
/* Functionality to support multiple VGA frame buffers can be added easily,
* but is not supported at this moment because there is no need for two or
* more "classic" VGA adapters. Multiple frame buffer drivers may be
* implemented and If we had implement it they would be named as "/dev/fb0",
* "/dev/fb1", "/dev/fb2" and so on.
*/
/*
* fbvga device driver INITIALIZE entry point.
*/
rtems_device_driver frame_buffer_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
printk( "FBVGA -- driver initializing..\n" );
/*
* Register the device
*/
status = rtems_io_register_name ("/dev/fb0", major, 0);
if (status != RTEMS_SUCCESSFUL) {
printk("Error registering /dev/fb0 FBVGA framebuffer device!\n");
rtems_fatal_error_occurred( status );
}
return RTEMS_SUCCESSFUL;
}
/*
* fbvga device driver OPEN entry point
*/
rtems_device_driver frame_buffer_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
if (pthread_mutex_trylock(&mutex)== 0){
/* restore previous state. for VGA this means return to text mode.
* leave out if graphics hardware has been initialized in
* frame_buffer_initialize()
*/
ega_hwinit();
printk( "FBVGA open called.\n" );
return RTEMS_SUCCESSFUL;
}
return RTEMS_UNSATISFIED;
}
/*
* fbvga device driver CLOSE entry point
*/
rtems_device_driver frame_buffer_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
if (pthread_mutex_unlock(&mutex) == 0){
/* restore previous state. for VGA this means return to text mode.
* leave out if graphics hardware has been initialized in
* frame_buffer_initialize() */
ega_hwterm();
printk( "FBVGA close called.\n" );
return RTEMS_SUCCESSFUL;
}
return RTEMS_UNSATISFIED;
}
/*
* fbvga device driver READ entry point.
*/
rtems_device_driver frame_buffer_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len ) ? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
memcpy(rw_args->buffer, (const void *) (fb_fix.smem_start + rw_args->offset), rw_args->bytes_moved);
return RTEMS_SUCCESSFUL;
}
/*
* frame_buffer device driver WRITE entry point.
*/
rtems_device_driver frame_buffer_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len ) ? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
memcpy( (void *) (fb_fix.smem_start + rw_args->offset), rw_args->buffer, rw_args->bytes_moved);
return RTEMS_SUCCESSFUL;
}
static int get_fix_screen_info( struct fb_fix_screeninfo *info )
{
*info = fb_fix;
return 0;
}
static int get_var_screen_info( struct fb_var_screeninfo *info )
{
*info = fb_var;
return 0;
}
static int get_palette( struct fb_cmap *cmap )
{
uint32_t i;
if ( cmap->start + cmap->len >= 16 )
return 1;
for( i = 0; i < cmap->len; i++ ) {
cmap->red[ cmap->start + i ] = red16[ cmap->start + i ];
cmap->green[ cmap->start + i ] = green16[ cmap->start + i ];
cmap->blue[ cmap->start + i ] = blue16[ cmap->start + i ];
}
return 0;
}
static int set_palette( struct fb_cmap *cmap )
{
uint32_t i;
if ( cmap->start + cmap->len >= 16 )
return 1;
for( i = 0; i < cmap->len; i++ ) {
red16[ cmap->start + i ] = cmap->red[ cmap->start + i ];
green16[ cmap->start + i ] = cmap->green[ cmap->start + i ];
blue16[ cmap->start + i ] = cmap->blue[ cmap->start + i ];
}
return 0;
}
/*
* IOCTL entry point -- This method is called to carry
* all services of this interface.
*/
rtems_device_driver frame_buffer_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_libio_ioctl_args_t *args = arg;
printk( "FBVGA ioctl called, cmd=%x\n", args->command );
switch( args->command ) {
case FBIOGET_FSCREENINFO:
args->ioctl_return = get_fix_screen_info( ( struct fb_fix_screeninfo * ) args->buffer );
break;
case FBIOGET_VSCREENINFO:
args->ioctl_return = get_var_screen_info( ( struct fb_var_screeninfo * ) args->buffer );
break;
case FBIOPUT_VSCREENINFO:
/* not implemented yet*/
args->ioctl_return = -1;
return RTEMS_UNSATISFIED;
case FBIOGETCMAP:
args->ioctl_return = get_palette( ( struct fb_cmap * ) args->buffer );
break;
case FBIOPUTCMAP:
args->ioctl_return = set_palette( ( struct fb_cmap * ) args->buffer );
break;
default:
args->ioctl_return = 0;
break;
}
return RTEMS_SUCCESSFUL;
}
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