forked from Imagelibrary/rtems
252 lines
6.7 KiB
C
252 lines
6.7 KiB
C
/* framebuffer.c
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*
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* This file is the framebuffer driver for the Milkymist VGA IP-core
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* This VGA Core is a part of Milkymist System-on-Chip
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*
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* COPYRIGHT (c) Yann Sionneau <yann.sionneau@telecom-sudparis.eu> (GSoC 2010)
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* Telecom SudParis
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* Copyright (c) 2011 Sebastien Bourdeauducq
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <rtems.h>
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#include <bsp.h>
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#include "../include/system_conf.h"
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#include <rtems/libio.h>
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#include <rtems/fb.h>
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#include <rtems/framebuffer.h>
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#include <rtems/bspIo.h>
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static unsigned short int framebufferA[1024*768]
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__attribute__((aligned(32)));
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static unsigned short int framebufferB[1024*768]
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__attribute__((aligned(32)));
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static unsigned short int framebufferC[1024*768]
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__attribute__((aligned(32)));
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static unsigned short int *frontbuffer;
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static unsigned short int *backbuffer;
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static unsigned short int *lastbuffer;
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static struct fb_var_screeninfo fb_var = {
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.xres = 640,
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.yres = 480,
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.bits_per_pixel = 16
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};
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static struct fb_fix_screeninfo fb_fix = {
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.smem_len = 1024 * 768 * 2,
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.type = FB_TYPE_VGA_PLANES,
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.visual = FB_VISUAL_TRUECOLOR,
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.line_length = 80
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};
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static int get_fix_screen_info( struct fb_fix_screeninfo *info )
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{
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*info = fb_fix;
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return 0;
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}
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static int get_var_screen_info( struct fb_var_screeninfo *info )
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{
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*info = fb_var;
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return 0;
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}
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static void init_buffers(void)
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{
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frontbuffer = framebufferA;
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backbuffer = framebufferB;
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lastbuffer = framebufferC;
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}
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static void swap_buffers(void)
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{
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unsigned short int *p;
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/* Make sure last buffer swap has been executed */
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while (MM_READ(MM_VGA_BASEADDRESS_ACT) != MM_READ(MM_VGA_BASEADDRESS));
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p = frontbuffer;
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frontbuffer = backbuffer;
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backbuffer = lastbuffer;
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lastbuffer = p;
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fb_fix.smem_start = (volatile char *)backbuffer;
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MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
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}
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static void set_video_mode(int mode)
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{
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int hres, vres;
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MM_WRITE(MM_VGA_RESET, VGA_RESET);
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hres = vres = 0;
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switch(mode) {
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case 0: // 640x480, pixel clock: 25MHz
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hres = 640;
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vres = 480;
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MM_WRITE(MM_VGA_HSYNC_START, 656);
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MM_WRITE(MM_VGA_HSYNC_END, 752);
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MM_WRITE(MM_VGA_HSCAN, 799);
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MM_WRITE(MM_VGA_VSYNC_START, 492);
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MM_WRITE(MM_VGA_VSYNC_END, 494);
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MM_WRITE(MM_VGA_VSCAN, 524);
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MM_WRITE(MM_VGA_CLKSEL, 0);
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break;
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case 1: // 800x600, pixel clock: 50MHz
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hres = 800;
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vres = 600;
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MM_WRITE(MM_VGA_HSYNC_START, 848);
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MM_WRITE(MM_VGA_HSYNC_END, 976);
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MM_WRITE(MM_VGA_HSCAN, 1040);
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MM_WRITE(MM_VGA_VSYNC_START, 636);
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MM_WRITE(MM_VGA_VSYNC_END, 642);
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MM_WRITE(MM_VGA_VSCAN, 665);
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MM_WRITE(MM_VGA_CLKSEL, 1);
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break;
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case 2: // 1024x768, pixel clock: 65MHz
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hres = 1024;
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vres = 768;
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MM_WRITE(MM_VGA_HSYNC_START, 1048);
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MM_WRITE(MM_VGA_HSYNC_END, 1184);
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MM_WRITE(MM_VGA_HSCAN, 1344);
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MM_WRITE(MM_VGA_VSYNC_START, 772);
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MM_WRITE(MM_VGA_VSYNC_END, 778);
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MM_WRITE(MM_VGA_VSCAN, 807);
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MM_WRITE(MM_VGA_CLKSEL, 2);
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break;
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}
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if((hres != 0) && (vres != 0)) {
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MM_WRITE(MM_VGA_HRES, hres);
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MM_WRITE(MM_VGA_VRES, vres);
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fb_var.xres = hres;
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fb_var.yres = vres;
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memset(framebufferA, 0, hres*vres*2);
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memset(framebufferB, 0, hres*vres*2);
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memset(framebufferC, 0, hres*vres*2);
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MM_WRITE(MM_VGA_BURST_COUNT, hres*vres/16);
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MM_WRITE(MM_VGA_RESET, 0);
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} /* otherwise, leave the VGA controller in reset */
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}
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rtems_device_driver frame_buffer_initialize(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_status_code status;
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init_buffers();
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fb_fix.smem_start = (volatile char *)frontbuffer;
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MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
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status = rtems_io_register_name(FRAMEBUFFER_DEVICE_0_NAME, major, 0);
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if (status != RTEMS_SUCCESSFUL) {
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printk("Error registering frame buffer device!\n");
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rtems_fatal_error_occurred( status );
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}
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver frame_buffer_close(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver frame_buffer_open(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver frame_buffer_read(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
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rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len)
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? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
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memcpy(rw_args->buffer, (const void *)(fb_fix.smem_start + rw_args->offset),
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rw_args->bytes_moved);
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver frame_buffer_write(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
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rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len)
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? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
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memcpy((void *)(fb_fix.smem_start + rw_args->offset), rw_args->buffer,
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rw_args->bytes_moved);
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return RTEMS_SUCCESSFUL;
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}
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rtems_device_driver frame_buffer_control(
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rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *arg
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)
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{
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rtems_libio_ioctl_args_t *args = arg;
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switch (args->command) {
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case FBIOGET_FSCREENINFO:
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args->ioctl_return =
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get_fix_screen_info((struct fb_fix_screeninfo *)args->buffer);
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return RTEMS_SUCCESSFUL;
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case FBIOGET_VSCREENINFO:
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args->ioctl_return =
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get_var_screen_info((struct fb_var_screeninfo *)args->buffer);
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return RTEMS_SUCCESSFUL;
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case FBIOSWAPBUFFERS:
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swap_buffers();
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args->ioctl_return = 0;
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return RTEMS_SUCCESSFUL;
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case FBIOSETBUFFERMODE:
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args->ioctl_return = 0;
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switch ((unsigned int)args->buffer) {
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case FB_SINGLE_BUFFERED:
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init_buffers();
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fb_fix.smem_start = (volatile char *)frontbuffer;
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MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
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return RTEMS_SUCCESSFUL;
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case FB_TRIPLE_BUFFERED:
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fb_fix.smem_start = (volatile char *)backbuffer;
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return RTEMS_SUCCESSFUL;
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default:
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return RTEMS_UNSATISFIED;
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}
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case FBIOSETVIDEOMODE:
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set_video_mode((int)args->buffer);
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return RTEMS_SUCCESSFUL;
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default:
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args->ioctl_return = -1;
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return RTEMS_UNSATISFIED;
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}
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}
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