source: rtems/c/src/lib/libbsp/lm32/shared/milkymist_framebuffer/framebuffer.c @ b2ed712

5
Last change on this file since b2ed712 was b2ed712, checked in by Sebastian Huber <sebastian.huber@…>, on 08/25/17 at 08:58:58

Include missing <string.h>

Update #2133.

  • Property mode set to 100644
File size: 6.7 KB
Line 
1/*  framebuffer.c
2 *
3 *  This file is the framebuffer driver for the Milkymist VGA IP-core
4 *  This VGA Core is a part of Milkymist System-on-Chip
5 *
6 *  The license and distribution terms for this file may be
7 *  found in the file LICENSE in this distribution or at
8 *  http://www.rtems.org/license/LICENSE.
9 *
10 *  COPYRIGHT (c) Yann Sionneau <yann.sionneau@telecom-sudparis.eu> (GSoC 2010)
11 *  Telecom SudParis
12 *  Copyright (c) 2011 Sebastien Bourdeauducq
13 */
14
15#include <stdlib.h>
16#include <stdio.h>
17#include <string.h>
18#include <errno.h>
19#include <sys/types.h>
20#include <rtems.h>
21#include <bsp.h>
22#include "../include/system_conf.h"
23#include <rtems/libio.h>
24#include <rtems/fb.h>
25#include <rtems/framebuffer.h>
26#include <rtems/bspIo.h>
27
28static unsigned short int framebufferA[1024*768]
29  __attribute__((aligned(32)));
30static unsigned short int framebufferB[1024*768]
31  __attribute__((aligned(32)));
32static unsigned short int framebufferC[1024*768]
33  __attribute__((aligned(32)));
34
35static unsigned short int *frontbuffer;
36static unsigned short int *backbuffer;
37static unsigned short int *lastbuffer;
38
39static struct fb_var_screeninfo fb_var = {
40  .xres                = 640,
41  .yres                = 480,
42  .bits_per_pixel      = 16
43};
44
45static struct fb_fix_screeninfo fb_fix = {
46  .smem_len            = 1024 * 768 * 2,
47  .type                = FB_TYPE_VGA_PLANES,
48  .visual              = FB_VISUAL_TRUECOLOR,
49  .line_length         = 80
50};
51
52static int get_fix_screen_info( struct fb_fix_screeninfo *info )
53{
54  *info = fb_fix;
55  return 0;
56}
57
58static int get_var_screen_info( struct fb_var_screeninfo *info )
59{
60  *info =  fb_var;
61  return 0;
62}
63
64static void init_buffers(void)
65{
66  frontbuffer = framebufferA;
67  backbuffer = framebufferB;
68  lastbuffer = framebufferC;
69}
70
71static void swap_buffers(void)
72{
73  unsigned short int *p;
74
75  /* Make sure last buffer swap has been executed */
76  while (MM_READ(MM_VGA_BASEADDRESS_ACT) != MM_READ(MM_VGA_BASEADDRESS));
77
78  p = frontbuffer;
79  frontbuffer = backbuffer;
80  backbuffer = lastbuffer;
81  lastbuffer = p;
82
83  fb_fix.smem_start = (volatile char *)backbuffer;
84  MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
85}
86
87static void set_video_mode(int mode)
88{
89  int hres, vres;
90 
91  MM_WRITE(MM_VGA_RESET, VGA_RESET);
92  hres = vres = 0;
93  switch(mode) {
94    case 0: // 640x480, pixel clock: 25MHz
95      hres = 640;
96      vres = 480;
97      MM_WRITE(MM_VGA_HSYNC_START, 656);
98      MM_WRITE(MM_VGA_HSYNC_END, 752);
99      MM_WRITE(MM_VGA_HSCAN, 799);
100      MM_WRITE(MM_VGA_VSYNC_START, 492);
101      MM_WRITE(MM_VGA_VSYNC_END, 494);
102      MM_WRITE(MM_VGA_VSCAN, 524);
103      MM_WRITE(MM_VGA_CLKSEL, 0);
104      break;
105    case 1: // 800x600, pixel clock: 50MHz
106      hres = 800;
107      vres = 600;
108      MM_WRITE(MM_VGA_HSYNC_START, 848);
109      MM_WRITE(MM_VGA_HSYNC_END, 976);
110      MM_WRITE(MM_VGA_HSCAN, 1040);
111      MM_WRITE(MM_VGA_VSYNC_START, 636);
112      MM_WRITE(MM_VGA_VSYNC_END, 642);
113      MM_WRITE(MM_VGA_VSCAN, 665);
114      MM_WRITE(MM_VGA_CLKSEL, 1);
115      break;
116    case 2: // 1024x768, pixel clock: 65MHz
117      hres = 1024;
118      vres = 768;
119      MM_WRITE(MM_VGA_HSYNC_START, 1048);
120      MM_WRITE(MM_VGA_HSYNC_END, 1184);
121      MM_WRITE(MM_VGA_HSCAN, 1344);
122      MM_WRITE(MM_VGA_VSYNC_START, 772);
123      MM_WRITE(MM_VGA_VSYNC_END, 778);
124      MM_WRITE(MM_VGA_VSCAN, 807);
125      MM_WRITE(MM_VGA_CLKSEL, 2);
126      break;
127  }
128  if((hres != 0) && (vres != 0)) {
129    MM_WRITE(MM_VGA_HRES, hres);
130    MM_WRITE(MM_VGA_VRES, vres);
131    fb_var.xres = hres;
132    fb_var.yres = vres;
133    memset(framebufferA, 0, hres*vres*2);
134    memset(framebufferB, 0, hres*vres*2);
135    memset(framebufferC, 0, hres*vres*2);
136    MM_WRITE(MM_VGA_BURST_COUNT, hres*vres/16);
137    MM_WRITE(MM_VGA_RESET, 0);
138  } /* otherwise, leave the VGA controller in reset */
139}
140
141rtems_device_driver frame_buffer_initialize(
142  rtems_device_major_number major,
143  rtems_device_minor_number minor,
144  void *arg
145)
146{
147  rtems_status_code status;
148
149  init_buffers();
150  fb_fix.smem_start = (volatile char *)frontbuffer;
151  MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
152
153  status = rtems_io_register_name(FRAMEBUFFER_DEVICE_0_NAME, major, 0);
154  if (status != RTEMS_SUCCESSFUL) {
155    printk("Error registering frame buffer device!\n");
156    rtems_fatal_error_occurred( status );
157  }
158
159  return RTEMS_SUCCESSFUL;
160}
161
162rtems_device_driver frame_buffer_close(
163  rtems_device_major_number major,
164  rtems_device_minor_number minor,
165  void *arg
166)
167{
168  return RTEMS_SUCCESSFUL;
169}
170
171rtems_device_driver frame_buffer_open(
172  rtems_device_major_number major,
173  rtems_device_minor_number minor,
174  void *arg
175)
176{
177  return RTEMS_SUCCESSFUL;
178}
179
180rtems_device_driver frame_buffer_read(
181  rtems_device_major_number major,
182  rtems_device_minor_number minor,
183  void *arg
184)
185{
186  rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
187  rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len)
188    ? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
189  memcpy(rw_args->buffer, (const void *)(fb_fix.smem_start + rw_args->offset),
190    rw_args->bytes_moved);
191  return RTEMS_SUCCESSFUL;
192}
193
194rtems_device_driver frame_buffer_write(
195  rtems_device_major_number major,
196  rtems_device_minor_number minor,
197  void *arg
198)
199{
200  rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
201  rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len)
202     ? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
203  memcpy((void *)(fb_fix.smem_start + rw_args->offset), rw_args->buffer,
204    rw_args->bytes_moved);
205  return RTEMS_SUCCESSFUL;
206}
207
208rtems_device_driver frame_buffer_control(
209  rtems_device_major_number major,
210  rtems_device_minor_number minor,
211  void *arg
212)
213{
214  rtems_libio_ioctl_args_t *args = arg;
215
216  switch (args->command) {
217    case FBIOGET_FSCREENINFO:
218      args->ioctl_return =
219        get_fix_screen_info((struct fb_fix_screeninfo *)args->buffer);
220      return RTEMS_SUCCESSFUL;
221    case FBIOGET_VSCREENINFO:
222      args->ioctl_return =
223        get_var_screen_info((struct fb_var_screeninfo *)args->buffer);
224      return RTEMS_SUCCESSFUL;
225    case FBIOSWAPBUFFERS:
226      swap_buffers();
227      args->ioctl_return = 0;
228      return RTEMS_SUCCESSFUL;
229    case FBIOSETBUFFERMODE:
230      args->ioctl_return = 0;
231      switch ((unsigned int)args->buffer) {
232        case FB_SINGLE_BUFFERED:
233          init_buffers();
234          fb_fix.smem_start = (volatile char *)frontbuffer;
235          MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
236          return RTEMS_SUCCESSFUL;
237        case FB_TRIPLE_BUFFERED:
238          fb_fix.smem_start = (volatile char *)backbuffer;
239          return RTEMS_SUCCESSFUL;
240        default:
241          return RTEMS_UNSATISFIED;
242      }
243    case FBIOSETVIDEOMODE:
244      set_video_mode((int)args->buffer);
245      return RTEMS_SUCCESSFUL;
246    default:
247      args->ioctl_return = -1;
248      return RTEMS_UNSATISFIED;
249  }
250}
251
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