1 /* 2 * linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer 3 * device 4 * 5 * Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de) 6 * Copyright (C) 1999 Geert Uytterhoeven 7 * 8 * Written for 2.0.x by Steffen A. Mork 9 * Ported to 2.1.x by Geert Uytterhoeven 10 * Ported to new api by James Simmons 11 * 12 * This file is subject to the terms and conditions of the GNU General Public 13 * License. See the file COPYING in the main directory of this archive for 14 * more details. 15 */ 16 17 #include <linux/module.h> 18 #include <linux/mm.h> 19 #include <linux/fb.h> 20 #include <linux/init.h> 21 #include <linux/zorro.h> 22 #include <asm/io.h> 23 24 /* 25 * Some technical notes: 26 * 27 * The BSC FrameMaster II (or Rainbow II) is a simple very dumb 28 * frame buffer which allows to display 24 bit true color images. 29 * Each pixel is 32 bit width so it's very easy to maintain the 30 * frame buffer. One long word has the following layout: 31 * AARRGGBB which means: AA the alpha channel byte, RR the red 32 * channel, GG the green channel and BB the blue channel. 33 * 34 * The FrameMaster II supports the following video modes. 35 * - PAL/NTSC 36 * - interlaced/non interlaced 37 * - composite sync/sync/sync over green 38 * 39 * The resolution is to the following both ones: 40 * - 768x576 (PAL) 41 * - 768x480 (NTSC) 42 * 43 * This means that pixel access per line is fixed due to the 44 * fixed line width. In case of maximal resolution the frame 45 * buffer needs an amount of memory of 1.769.472 bytes which 46 * is near to 2 MByte (the allocated address space of Zorro2). 47 * The memory is channel interleaved. That means every channel 48 * owns four VRAMs. Unfortunately most FrameMasters II are 49 * not assembled with memory for the alpha channel. In this 50 * case it could be possible to add the frame buffer into the 51 * normal memory pool. 52 * 53 * At relative address 0x1ffff8 of the frame buffers base address 54 * there exists a control register with the number of 55 * four control bits. They have the following meaning: 56 * bit value meaning 57 * 58 * 0 1 0=interlaced/1=non interlaced 59 * 1 2 0=video out disabled/1=video out enabled 60 * 2 4 0=normal mode as jumpered via JP8/1=complement mode 61 * 3 8 0=read onboard ROM/1 normal operation (required) 62 * 63 * As mentioned above there are several jumper. I think there 64 * is not very much information about the FrameMaster II in 65 * the world so I add these information for completeness. 66 * 67 * JP1 interlace selection (1-2 non interlaced/2-3 interlaced) 68 * JP2 wait state creation (leave as is!) 69 * JP3 wait state creation (leave as is!) 70 * JP4 modulate composite sync on green output (1-2 composite 71 * sync on green channel/2-3 normal composite sync) 72 * JP5 create test signal, shorting this jumper will create 73 * a white screen 74 * JP6 sync creation (1-2 composite sync/2-3 H-sync output) 75 * JP8 video mode (1-2 PAL/2-3 NTSC) 76 * 77 * With the following jumpering table you can connect the 78 * FrameMaster II to a normal TV via SCART connector: 79 * JP1: 2-3 80 * JP4: 2-3 81 * JP6: 2-3 82 * JP8: 1-2 (means PAL for Europe) 83 * 84 * NOTE: 85 * There is no other possibility to change the video timings 86 * except the interlaced/non interlaced, sync control and the 87 * video mode PAL (50 Hz)/NTSC (60 Hz). Inside this 88 * FrameMaster II driver are assumed values to avoid anomalies 89 * to a future X server. Except the pixel clock is really 90 * constant at 30 MHz. 91 * 92 * 9 pin female video connector: 93 * 94 * 1 analog red 0.7 Vss 95 * 2 analog green 0.7 Vss 96 * 3 analog blue 0.7 Vss 97 * 4 H-sync TTL 98 * 5 V-sync TTL 99 * 6 ground 100 * 7 ground 101 * 8 ground 102 * 9 ground 103 * 104 * Some performance notes: 105 * The FrameMaster II was not designed to display a console 106 * this driver would do! It was designed to display still true 107 * color images. Imagine: When scroll up a text line there 108 * must copied ca. 1.7 MBytes to another place inside this 109 * frame buffer. This means 1.7 MByte read and 1.7 MByte write 110 * over the slow 16 bit wide Zorro2 bus! A scroll of one 111 * line needs 1 second so do not expect to much from this 112 * driver - he is at the limit! 113 * 114 */ 115 116 /* 117 * definitions 118 */ 119 120 #define FRAMEMASTER_SIZE 0x200000 121 #define FRAMEMASTER_REG 0x1ffff8 122 123 #define FRAMEMASTER_NOLACE 1 124 #define FRAMEMASTER_ENABLE 2 125 #define FRAMEMASTER_COMPL 4 126 #define FRAMEMASTER_ROM 8 127 128 static volatile unsigned char *fm2fb_reg; 129 130 static struct fb_fix_screeninfo fb_fix = { 131 .smem_len = FRAMEMASTER_REG, 132 .type = FB_TYPE_PACKED_PIXELS, 133 .visual = FB_VISUAL_TRUECOLOR, 134 .line_length = (768 << 2), 135 .mmio_len = (8), 136 .accel = FB_ACCEL_NONE, 137 }; 138 139 static int fm2fb_mode = -1; 140 141 #define FM2FB_MODE_PAL 0 142 #define FM2FB_MODE_NTSC 1 143 144 static struct fb_var_screeninfo fb_var_modes[] = { 145 { 146 /* 768 x 576, 32 bpp (PAL) */ 147 768, 576, 768, 576, 0, 0, 32, 0, 148 { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 }, 149 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE, 150 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0 151 }, { 152 /* 768 x 480, 32 bpp (NTSC - not supported yet */ 153 768, 480, 768, 480, 0, 0, 32, 0, 154 { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 }, 155 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE, 156 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0 157 } 158 }; 159 160 /* 161 * Interface used by the world 162 */ 163 164 static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 165 u_int transp, struct fb_info *info); 166 static int fm2fb_blank(int blank, struct fb_info *info); 167 168 static const struct fb_ops fm2fb_ops = { 169 .owner = THIS_MODULE, 170 FB_DEFAULT_IOMEM_OPS, 171 .fb_setcolreg = fm2fb_setcolreg, 172 .fb_blank = fm2fb_blank, 173 }; 174 175 /* 176 * Blank the display. 177 */ 178 static int fm2fb_blank(int blank, struct fb_info *info) 179 { 180 unsigned char t = FRAMEMASTER_ROM; 181 182 if (!blank) 183 t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE; 184 fm2fb_reg[0] = t; 185 return 0; 186 } 187 188 /* 189 * Set a single color register. The values supplied are already 190 * rounded down to the hardware's capabilities (according to the 191 * entries in the var structure). Return != 0 for invalid regno. 192 */ 193 static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 194 u_int transp, struct fb_info *info) 195 { 196 if (regno < 16) { 197 red >>= 8; 198 green >>= 8; 199 blue >>= 8; 200 201 ((u32*)(info->pseudo_palette))[regno] = (red << 16) | 202 (green << 8) | blue; 203 } 204 205 return 0; 206 } 207 208 /* 209 * Initialisation 210 */ 211 212 static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id); 213 214 static const struct zorro_device_id fm2fb_devices[] = { 215 { ZORRO_PROD_BSC_FRAMEMASTER_II }, 216 { ZORRO_PROD_HELFRICH_RAINBOW_II }, 217 { 0 } 218 }; 219 MODULE_DEVICE_TABLE(zorro, fm2fb_devices); 220 221 static struct zorro_driver fm2fb_driver = { 222 .name = "fm2fb", 223 .id_table = fm2fb_devices, 224 .probe = fm2fb_probe, 225 }; 226 227 static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id) 228 { 229 struct fb_info *info; 230 unsigned long *ptr; 231 int is_fm; 232 int x, y; 233 234 is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II; 235 236 if (!zorro_request_device(z,"fm2fb")) 237 return -ENXIO; 238 239 info = framebuffer_alloc(16 * sizeof(u32), &z->dev); 240 if (!info) { 241 zorro_release_device(z); 242 return -ENOMEM; 243 } 244 245 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 246 framebuffer_release(info); 247 zorro_release_device(z); 248 return -ENOMEM; 249 } 250 251 /* assigning memory to kernel space */ 252 fb_fix.smem_start = zorro_resource_start(z); 253 info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE); 254 fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG; 255 fm2fb_reg = (unsigned char *)(info->screen_base+FRAMEMASTER_REG); 256 257 strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II"); 258 259 /* make EBU color bars on display */ 260 ptr = (unsigned long *)fb_fix.smem_start; 261 for (y = 0; y < 576; y++) { 262 for (x = 0; x < 96; x++) *ptr++ = 0xffffff;/* white */ 263 for (x = 0; x < 96; x++) *ptr++ = 0xffff00;/* yellow */ 264 for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;/* cyan */ 265 for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;/* green */ 266 for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;/* magenta */ 267 for (x = 0; x < 96; x++) *ptr++ = 0xff0000;/* red */ 268 for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;/* blue */ 269 for (x = 0; x < 96; x++) *ptr++ = 0x000000;/* black */ 270 } 271 fm2fb_blank(0, info); 272 273 if (fm2fb_mode == -1) 274 fm2fb_mode = FM2FB_MODE_PAL; 275 276 info->fbops = &fm2fb_ops; 277 info->var = fb_var_modes[fm2fb_mode]; 278 info->pseudo_palette = info->par; 279 info->par = NULL; 280 info->fix = fb_fix; 281 282 if (register_framebuffer(info) < 0) { 283 fb_dealloc_cmap(&info->cmap); 284 iounmap(info->screen_base); 285 framebuffer_release(info); 286 zorro_release_device(z); 287 return -EINVAL; 288 } 289 fb_info(info, "%s frame buffer device\n", fb_fix.id); 290 return 0; 291 } 292 293 static int __init fm2fb_setup(char *options) 294 { 295 char *this_opt; 296 297 if (!options || !*options) 298 return 0; 299 300 while ((this_opt = strsep(&options, ",")) != NULL) { 301 if (!strncmp(this_opt, "pal", 3)) 302 fm2fb_mode = FM2FB_MODE_PAL; 303 else if (!strncmp(this_opt, "ntsc", 4)) 304 fm2fb_mode = FM2FB_MODE_NTSC; 305 } 306 return 0; 307 } 308 309 static int __init fm2fb_init(void) 310 { 311 char *option = NULL; 312 313 if (fb_get_options("fm2fb", &option)) 314 return -ENODEV; 315 fm2fb_setup(option); 316 return zorro_register_driver(&fm2fb_driver); 317 } 318 319 module_init(fm2fb_init); 320 MODULE_LICENSE("GPL"); 321