source: rtems/c/src/lib/libbsp/lm32/shared/milkymist_framebuffer/framebuffer.c @ dce1032b

4.115
Last change on this file since dce1032b was dce1032b, checked in by Joel Sherrill <joel.sherrill@…>, on 08/01/11 at 13:48:40

2011-08-01 Sebastien Bourdeauducq <sebastien.bourdeauducq@…>

PR 1869/bsps

  • startup/bspclean.c: New file.
  • include/tm27.h: Removed.
  • ChangeLog?, Makefile.am, README, preinstall.am, include/bsp.h, include/system_conf.h, make/custom/milkymist.cfg, startup/linkcmds: Complete BSP for Milkymist One supporting Milkymist SOC 1.0.x. Includes new or updated drivers for:
    • Multi-standard video input (PAL/SECAM/NTSC)
    • Two DMX512 (RS485) ports
    • MIDI IN and MIDI OUT ports
    • VGA output
    • AC'97 audio
    • NOR flash
    • 10/100 Ethernet
    • Memory card (experimental and incomplete)
    • USB host connectors (input devices only)
    • RC5 infrared receiver
    • RS232 debug port
  • 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.com/license/LICENSE.
9 *
10 *  $Id$
11 *
12 *  COPYRIGHT (c) Yann Sionneau <yann.sionneau@telecom-sudparis.eu> (GSoC 2010)
13 *  Telecom SudParis
14 *  Copyright (c) 2011 Sebastien Bourdeauducq
15 */
16
17#include <stdlib.h>
18#include <stdio.h>
19#include <errno.h>
20#include <sys/types.h>
21#include <rtems.h>
22#include <bsp.h>
23#include "../include/system_conf.h"
24#include <rtems/libio.h>
25#include <rtems/fb.h>
26
27#define FRAMEBUFFER_DEVICE_NAME "/dev/fb"
28
29static unsigned short int framebufferA[1024*768]
30  __attribute__((aligned(32)));
31static unsigned short int framebufferB[1024*768]
32  __attribute__((aligned(32)));
33static unsigned short int framebufferC[1024*768]
34  __attribute__((aligned(32)));
35
36static unsigned short int *frontbuffer;
37static unsigned short int *backbuffer;
38static unsigned short int *lastbuffer;
39
40static struct fb_var_screeninfo fb_var = {
41  .xres                = 640,
42  .yres                = 480,
43  .bits_per_pixel      = 16
44};
45
46static struct fb_fix_screeninfo fb_fix = {
47  .smem_len            = 1024 * 768 * 2,
48  .type                = FB_TYPE_VGA_PLANES,
49  .visual              = FB_VISUAL_TRUECOLOR,
50  .line_length         = 80
51};
52
53static int get_fix_screen_info( struct fb_fix_screeninfo *info )
54{
55  *info = fb_fix;
56  return 0;
57}
58
59static int get_var_screen_info( struct fb_var_screeninfo *info )
60{
61  *info =  fb_var;
62  return 0;
63}
64
65static void init_buffers(void)
66{
67  frontbuffer = framebufferA;
68  backbuffer = framebufferB;
69  lastbuffer = framebufferC;
70}
71
72static void swap_buffers(void)
73{
74  unsigned short int *p;
75
76  /* Make sure last buffer swap has been executed */
77  while (MM_READ(MM_VGA_BASEADDRESS_ACT) != MM_READ(MM_VGA_BASEADDRESS));
78
79  p = frontbuffer;
80  frontbuffer = backbuffer;
81  backbuffer = lastbuffer;
82  lastbuffer = p;
83
84  fb_fix.smem_start = (volatile char *)backbuffer;
85  MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
86}
87
88static void set_video_mode(int mode)
89{
90  int hres, vres;
91 
92  MM_WRITE(MM_VGA_RESET, VGA_RESET);
93  hres = vres = 0;
94  switch(mode) {
95    case 0: // 640x480, pixel clock: 25MHz
96      hres = 640;
97      vres = 480;
98      MM_WRITE(MM_VGA_HSYNC_START, 656);
99      MM_WRITE(MM_VGA_HSYNC_END, 752);
100      MM_WRITE(MM_VGA_HSCAN, 799);
101      MM_WRITE(MM_VGA_VSYNC_START, 491);
102      MM_WRITE(MM_VGA_VSYNC_END, 493);
103      MM_WRITE(MM_VGA_VSCAN, 523);
104      MM_WRITE(MM_VGA_CLKSEL, 0);
105      break;
106    case 1: // 800x600, pixel clock: 50MHz
107      hres = 800;
108      vres = 600;
109      MM_WRITE(MM_VGA_HSYNC_START, 848);
110      MM_WRITE(MM_VGA_HSYNC_END, 976);
111      MM_WRITE(MM_VGA_HSCAN, 1040);
112      MM_WRITE(MM_VGA_VSYNC_START, 637);
113      MM_WRITE(MM_VGA_VSYNC_END, 643);
114      MM_WRITE(MM_VGA_VSCAN, 666);
115      MM_WRITE(MM_VGA_CLKSEL, 1);
116      break;
117    case 2: // 1024x768, pixel clock: 65MHz
118      hres = 1024;
119      vres = 768;
120      MM_WRITE(MM_VGA_HSYNC_START, 1048);
121      MM_WRITE(MM_VGA_HSYNC_END, 1184);
122      MM_WRITE(MM_VGA_HSCAN, 1344);
123      MM_WRITE(MM_VGA_VSYNC_START, 771);
124      MM_WRITE(MM_VGA_VSYNC_END, 777);
125      MM_WRITE(MM_VGA_VSCAN, 806);
126      MM_WRITE(MM_VGA_CLKSEL, 2);
127      break;
128  }
129  if((hres != 0) && (vres != 0)) {
130    MM_WRITE(MM_VGA_HRES, hres);
131    MM_WRITE(MM_VGA_VRES, vres);
132    fb_var.xres = hres;
133    fb_var.yres = vres;
134    memset(framebufferA, 0, hres*vres*2);
135    memset(framebufferB, 0, hres*vres*2);
136    memset(framebufferC, 0, hres*vres*2);
137    MM_WRITE(MM_VGA_BURST_COUNT, hres*vres/16);
138    MM_WRITE(MM_VGA_RESET, 0);
139  } /* otherwise, leave the VGA controller in reset */
140}
141
142rtems_device_driver frame_buffer_initialize(
143  rtems_device_major_number major,
144  rtems_device_minor_number minor,
145  void *arg
146)
147{
148  rtems_status_code status;
149
150  init_buffers();
151  fb_fix.smem_start = (volatile char *)frontbuffer;
152  MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
153
154  status = rtems_io_register_name(FRAMEBUFFER_DEVICE_NAME, major, 0);
155  if (status != RTEMS_SUCCESSFUL) {
156    printk("Error registering frame buffer device!\n");
157    rtems_fatal_error_occurred( status );
158  }
159
160  return RTEMS_SUCCESSFUL;
161}
162
163rtems_device_driver frame_buffer_close(
164  rtems_device_major_number major,
165  rtems_device_minor_number minor,
166  void *arg
167)
168{
169  return RTEMS_SUCCESSFUL;
170}
171
172rtems_device_driver frame_buffer_open(
173  rtems_device_major_number major,
174  rtems_device_minor_number minor,
175  void *arg
176)
177{
178  return RTEMS_SUCCESSFUL;
179}
180
181rtems_device_driver frame_buffer_read(
182  rtems_device_major_number major,
183  rtems_device_minor_number minor,
184  void *arg
185)
186{
187  rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
188  rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len)
189    ? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
190  memcpy(rw_args->buffer, (const void *)(fb_fix.smem_start + rw_args->offset),
191    rw_args->bytes_moved);
192  return RTEMS_SUCCESSFUL;
193}
194
195rtems_device_driver frame_buffer_write(
196  rtems_device_major_number major,
197  rtems_device_minor_number minor,
198  void *arg
199)
200{
201  rtems_libio_rw_args_t *rw_args = (rtems_libio_rw_args_t *)arg;
202  rw_args->bytes_moved = ((rw_args->offset + rw_args->count) > fb_fix.smem_len)
203     ? (fb_fix.smem_len - rw_args->offset) : rw_args->count;
204  memcpy((void *)(fb_fix.smem_start + rw_args->offset), rw_args->buffer,
205    rw_args->bytes_moved);
206  return RTEMS_SUCCESSFUL;
207}
208
209rtems_device_driver frame_buffer_control(
210  rtems_device_major_number major,
211  rtems_device_minor_number minor,
212  void *arg
213)
214{
215  rtems_libio_ioctl_args_t *args = arg;
216
217  switch (args->command) {
218    case FBIOGET_FSCREENINFO:
219      args->ioctl_return =
220        get_fix_screen_info((struct fb_fix_screeninfo *)args->buffer);
221      return RTEMS_SUCCESSFUL;
222    case FBIOGET_VSCREENINFO:
223      args->ioctl_return =
224        get_var_screen_info((struct fb_var_screeninfo *)args->buffer);
225      return RTEMS_SUCCESSFUL;
226    case FBIOSWAPBUFFERS:
227      swap_buffers();
228      args->ioctl_return = 0;
229      return RTEMS_SUCCESSFUL;
230    case FBIOSETBUFFERMODE:
231      args->ioctl_return = 0;
232      switch ((unsigned int)args->buffer) {
233        case FB_SINGLE_BUFFERED:
234          init_buffers();
235          fb_fix.smem_start = (volatile char *)frontbuffer;
236          MM_WRITE(MM_VGA_BASEADDRESS, (unsigned int)frontbuffer);
237          return RTEMS_SUCCESSFUL;
238        case FB_TRIPLE_BUFFERED:
239          fb_fix.smem_start = (volatile char *)backbuffer;
240          return RTEMS_SUCCESSFUL;
241        default:
242          return RTEMS_UNSATISFIED;
243      }
244    case FBIOSETVIDEOMODE:
245      set_video_mode((int)args->buffer);
246      return RTEMS_SUCCESSFUL;
247    default:
248      args->ioctl_return = -1;
249      return RTEMS_UNSATISFIED;
250  }
251}
252
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