1 /* 2 * linux/drivers/video/68328fb.c -- Low level implementation of the 3 * mc68x328 LCD frame buffer device 4 * 5 * Copyright (C) 2003 Georges Menie 6 * 7 * This driver assumes an already configured controller (e.g. from config.c) 8 * Keep the code clean of board specific initialization. 9 * 10 * This code has not been tested with colors, colormap management functions 11 * are minimal (no colormap data written to the 68328 registers...) 12 * 13 * initial version of this driver: 14 * Copyright (C) 1998,1999 Kenneth Albanowski <kjahds@kjahds.com>, 15 * The Silver Hammer Group, Ltd. 16 * 17 * this version is based on : 18 * 19 * linux/drivers/video/vfb.c -- Virtual frame buffer device 20 * 21 * Copyright (C) 2002 James Simmons 22 * 23 * Copyright (C) 1997 Geert Uytterhoeven 24 * 25 * This file is subject to the terms and conditions of the GNU General Public 26 * License. See the file COPYING in the main directory of this archive for 27 * more details. 28 */ 29 30 #include <linux/module.h> 31 #include <linux/kernel.h> 32 #include <linux/errno.h> 33 #include <linux/string.h> 34 #include <linux/mm.h> 35 #include <linux/vmalloc.h> 36 #include <linux/delay.h> 37 #include <linux/interrupt.h> 38 #include <linux/uaccess.h> 39 #include <linux/fb.h> 40 #include <linux/init.h> 41 42 #if defined(CONFIG_M68VZ328) 43 #include <asm/MC68VZ328.h> 44 #elif defined(CONFIG_M68EZ328) 45 #include <asm/MC68EZ328.h> 46 #elif defined(CONFIG_M68328) 47 #include <asm/MC68328.h> 48 #else 49 #error wrong architecture for the MC68x328 frame buffer device 50 #endif 51 52 static u_long videomemory; 53 static u_long videomemorysize; 54 55 static struct fb_info fb_info; 56 static u32 mc68x328fb_pseudo_palette[16]; 57 58 static struct fb_var_screeninfo mc68x328fb_default __initdata = { 59 .red = { 0, 8, 0 }, 60 .green = { 0, 8, 0 }, 61 .blue = { 0, 8, 0 }, 62 .activate = FB_ACTIVATE_TEST, 63 .height = -1, 64 .width = -1, 65 .pixclock = 20000, 66 .left_margin = 64, 67 .right_margin = 64, 68 .upper_margin = 32, 69 .lower_margin = 32, 70 .hsync_len = 64, 71 .vsync_len = 2, 72 .vmode = FB_VMODE_NONINTERLACED, 73 }; 74 75 static const struct fb_fix_screeninfo mc68x328fb_fix __initconst = { 76 .id = "68328fb", 77 .type = FB_TYPE_PACKED_PIXELS, 78 .xpanstep = 1, 79 .ypanstep = 1, 80 .ywrapstep = 1, 81 .accel = FB_ACCEL_NONE, 82 }; 83 84 /* 85 * Interface used by the world 86 */ 87 int mc68x328fb_init(void); 88 int mc68x328fb_setup(char *); 89 90 static int mc68x328fb_check_var(struct fb_var_screeninfo *var, 91 struct fb_info *info); 92 static int mc68x328fb_set_par(struct fb_info *info); 93 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 94 u_int transp, struct fb_info *info); 95 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, 96 struct fb_info *info); 97 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma); 98 99 static const struct fb_ops mc68x328fb_ops = { 100 .fb_check_var = mc68x328fb_check_var, 101 .fb_set_par = mc68x328fb_set_par, 102 .fb_setcolreg = mc68x328fb_setcolreg, 103 .fb_pan_display = mc68x328fb_pan_display, 104 .fb_fillrect = cfb_fillrect, 105 .fb_copyarea = cfb_copyarea, 106 .fb_imageblit = cfb_imageblit, 107 .fb_mmap = mc68x328fb_mmap, 108 }; 109 110 /* 111 * Internal routines 112 */ 113 114 static u_long get_line_length(int xres_virtual, int bpp) 115 { 116 u_long length; 117 118 length = xres_virtual * bpp; 119 length = (length + 31) & ~31; 120 length >>= 3; 121 return (length); 122 } 123 124 /* 125 * Setting the video mode has been split into two parts. 126 * First part, xxxfb_check_var, must not write anything 127 * to hardware, it should only verify and adjust var. 128 * This means it doesn't alter par but it does use hardware 129 * data from it to check this var. 130 */ 131 132 static int mc68x328fb_check_var(struct fb_var_screeninfo *var, 133 struct fb_info *info) 134 { 135 u_long line_length; 136 137 /* 138 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! 139 * as FB_VMODE_SMOOTH_XPAN is only used internally 140 */ 141 142 if (var->vmode & FB_VMODE_CONUPDATE) { 143 var->vmode |= FB_VMODE_YWRAP; 144 var->xoffset = info->var.xoffset; 145 var->yoffset = info->var.yoffset; 146 } 147 148 /* 149 * Some very basic checks 150 */ 151 if (!var->xres) 152 var->xres = 1; 153 if (!var->yres) 154 var->yres = 1; 155 if (var->xres > var->xres_virtual) 156 var->xres_virtual = var->xres; 157 if (var->yres > var->yres_virtual) 158 var->yres_virtual = var->yres; 159 if (var->bits_per_pixel <= 1) 160 var->bits_per_pixel = 1; 161 else if (var->bits_per_pixel <= 8) 162 var->bits_per_pixel = 8; 163 else if (var->bits_per_pixel <= 16) 164 var->bits_per_pixel = 16; 165 else if (var->bits_per_pixel <= 24) 166 var->bits_per_pixel = 24; 167 else if (var->bits_per_pixel <= 32) 168 var->bits_per_pixel = 32; 169 else 170 return -EINVAL; 171 172 if (var->xres_virtual < var->xoffset + var->xres) 173 var->xres_virtual = var->xoffset + var->xres; 174 if (var->yres_virtual < var->yoffset + var->yres) 175 var->yres_virtual = var->yoffset + var->yres; 176 177 /* 178 * Memory limit 179 */ 180 line_length = 181 get_line_length(var->xres_virtual, var->bits_per_pixel); 182 if (line_length * var->yres_virtual > videomemorysize) 183 return -ENOMEM; 184 185 /* 186 * Now that we checked it we alter var. The reason being is that the video 187 * mode passed in might not work but slight changes to it might make it 188 * work. This way we let the user know what is acceptable. 189 */ 190 switch (var->bits_per_pixel) { 191 case 1: 192 var->red.offset = 0; 193 var->red.length = 1; 194 var->green.offset = 0; 195 var->green.length = 1; 196 var->blue.offset = 0; 197 var->blue.length = 1; 198 var->transp.offset = 0; 199 var->transp.length = 0; 200 break; 201 case 8: 202 var->red.offset = 0; 203 var->red.length = 8; 204 var->green.offset = 0; 205 var->green.length = 8; 206 var->blue.offset = 0; 207 var->blue.length = 8; 208 var->transp.offset = 0; 209 var->transp.length = 0; 210 break; 211 case 16: /* RGBA 5551 */ 212 if (var->transp.length) { 213 var->red.offset = 0; 214 var->red.length = 5; 215 var->green.offset = 5; 216 var->green.length = 5; 217 var->blue.offset = 10; 218 var->blue.length = 5; 219 var->transp.offset = 15; 220 var->transp.length = 1; 221 } else { /* RGB 565 */ 222 var->red.offset = 0; 223 var->red.length = 5; 224 var->green.offset = 5; 225 var->green.length = 6; 226 var->blue.offset = 11; 227 var->blue.length = 5; 228 var->transp.offset = 0; 229 var->transp.length = 0; 230 } 231 break; 232 case 24: /* RGB 888 */ 233 var->red.offset = 0; 234 var->red.length = 8; 235 var->green.offset = 8; 236 var->green.length = 8; 237 var->blue.offset = 16; 238 var->blue.length = 8; 239 var->transp.offset = 0; 240 var->transp.length = 0; 241 break; 242 case 32: /* RGBA 8888 */ 243 var->red.offset = 0; 244 var->red.length = 8; 245 var->green.offset = 8; 246 var->green.length = 8; 247 var->blue.offset = 16; 248 var->blue.length = 8; 249 var->transp.offset = 24; 250 var->transp.length = 8; 251 break; 252 } 253 var->red.msb_right = 0; 254 var->green.msb_right = 0; 255 var->blue.msb_right = 0; 256 var->transp.msb_right = 0; 257 258 return 0; 259 } 260 261 /* This routine actually sets the video mode. It's in here where we 262 * the hardware state info->par and fix which can be affected by the 263 * change in par. For this driver it doesn't do much. 264 */ 265 static int mc68x328fb_set_par(struct fb_info *info) 266 { 267 info->fix.line_length = get_line_length(info->var.xres_virtual, 268 info->var.bits_per_pixel); 269 return 0; 270 } 271 272 /* 273 * Set a single color register. The values supplied are already 274 * rounded down to the hardware's capabilities (according to the 275 * entries in the var structure). Return != 0 for invalid regno. 276 */ 277 278 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 279 u_int transp, struct fb_info *info) 280 { 281 if (regno >= 256) /* no. of hw registers */ 282 return 1; 283 /* 284 * Program hardware... do anything you want with transp 285 */ 286 287 /* grayscale works only partially under directcolor */ 288 if (info->var.grayscale) { 289 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 290 red = green = blue = 291 (red * 77 + green * 151 + blue * 28) >> 8; 292 } 293 294 /* Directcolor: 295 * var->{color}.offset contains start of bitfield 296 * var->{color}.length contains length of bitfield 297 * {hardwarespecific} contains width of RAMDAC 298 * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) 299 * RAMDAC[X] is programmed to (red, green, blue) 300 * 301 * Pseudocolor: 302 * uses offset = 0 && length = RAMDAC register width. 303 * var->{color}.offset is 0 304 * var->{color}.length contains width of DAC 305 * cmap is not used 306 * RAMDAC[X] is programmed to (red, green, blue) 307 * Truecolor: 308 * does not use DAC. Usually 3 are present. 309 * var->{color}.offset contains start of bitfield 310 * var->{color}.length contains length of bitfield 311 * cmap is programmed to (red << red.offset) | (green << green.offset) | 312 * (blue << blue.offset) | (transp << transp.offset) 313 * RAMDAC does not exist 314 */ 315 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) 316 switch (info->fix.visual) { 317 case FB_VISUAL_TRUECOLOR: 318 case FB_VISUAL_PSEUDOCOLOR: 319 red = CNVT_TOHW(red, info->var.red.length); 320 green = CNVT_TOHW(green, info->var.green.length); 321 blue = CNVT_TOHW(blue, info->var.blue.length); 322 transp = CNVT_TOHW(transp, info->var.transp.length); 323 break; 324 case FB_VISUAL_DIRECTCOLOR: 325 red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ 326 green = CNVT_TOHW(green, 8); 327 blue = CNVT_TOHW(blue, 8); 328 /* hey, there is bug in transp handling... */ 329 transp = CNVT_TOHW(transp, 8); 330 break; 331 } 332 #undef CNVT_TOHW 333 /* Truecolor has hardware independent palette */ 334 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 335 u32 v; 336 337 if (regno >= 16) 338 return 1; 339 340 v = (red << info->var.red.offset) | 341 (green << info->var.green.offset) | 342 (blue << info->var.blue.offset) | 343 (transp << info->var.transp.offset); 344 switch (info->var.bits_per_pixel) { 345 case 8: 346 break; 347 case 16: 348 ((u32 *) (info->pseudo_palette))[regno] = v; 349 break; 350 case 24: 351 case 32: 352 ((u32 *) (info->pseudo_palette))[regno] = v; 353 break; 354 } 355 return 0; 356 } 357 return 0; 358 } 359 360 /* 361 * Pan or Wrap the Display 362 * 363 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag 364 */ 365 366 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, 367 struct fb_info *info) 368 { 369 if (var->vmode & FB_VMODE_YWRAP) { 370 if (var->yoffset < 0 371 || var->yoffset >= info->var.yres_virtual 372 || var->xoffset) 373 return -EINVAL; 374 } else { 375 if (var->xoffset + info->var.xres > info->var.xres_virtual || 376 var->yoffset + info->var.yres > info->var.yres_virtual) 377 return -EINVAL; 378 } 379 info->var.xoffset = var->xoffset; 380 info->var.yoffset = var->yoffset; 381 if (var->vmode & FB_VMODE_YWRAP) 382 info->var.vmode |= FB_VMODE_YWRAP; 383 else 384 info->var.vmode &= ~FB_VMODE_YWRAP; 385 return 0; 386 } 387 388 /* 389 * Most drivers don't need their own mmap function 390 */ 391 392 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 393 { 394 #ifndef MMU 395 /* this is uClinux (no MMU) specific code */ 396 397 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 398 vma->vm_start = videomemory; 399 400 return 0; 401 #else 402 return -EINVAL; 403 #endif 404 } 405 406 int __init mc68x328fb_setup(char *options) 407 { 408 if (!options || !*options) 409 return 1; 410 return 1; 411 } 412 413 /* 414 * Initialisation 415 */ 416 417 int __init mc68x328fb_init(void) 418 { 419 #ifndef MODULE 420 char *option = NULL; 421 422 if (fb_get_options("68328fb", &option)) 423 return -ENODEV; 424 mc68x328fb_setup(option); 425 #endif 426 /* 427 * initialize the default mode from the LCD controller registers 428 */ 429 mc68x328fb_default.xres = LXMAX; 430 mc68x328fb_default.yres = LYMAX+1; 431 mc68x328fb_default.xres_virtual = mc68x328fb_default.xres; 432 mc68x328fb_default.yres_virtual = mc68x328fb_default.yres; 433 mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01); 434 videomemory = LSSA; 435 videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 * 436 mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel; 437 438 fb_info.screen_base = (void *)videomemory; 439 fb_info.fbops = &mc68x328fb_ops; 440 fb_info.var = mc68x328fb_default; 441 fb_info.fix = mc68x328fb_fix; 442 fb_info.fix.smem_start = videomemory; 443 fb_info.fix.smem_len = videomemorysize; 444 fb_info.fix.line_length = 445 get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel); 446 fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ? 447 FB_VISUAL_MONO10 : FB_VISUAL_PSEUDOCOLOR; 448 if (fb_info.var.bits_per_pixel == 1) { 449 fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1; 450 fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0; 451 } 452 fb_info.pseudo_palette = &mc68x328fb_pseudo_palette; 453 fb_info.flags = FBINFO_DEFAULT | FBINFO_HWACCEL_YPAN; 454 455 if (fb_alloc_cmap(&fb_info.cmap, 256, 0)) 456 return -ENOMEM; 457 458 if (register_framebuffer(&fb_info) < 0) { 459 fb_dealloc_cmap(&fb_info.cmap); 460 return -EINVAL; 461 } 462 463 fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id); 464 fb_info(&fb_info, "%dx%dx%d at 0x%08lx\n", 465 mc68x328fb_default.xres_virtual, 466 mc68x328fb_default.yres_virtual, 467 1 << mc68x328fb_default.bits_per_pixel, videomemory); 468 469 return 0; 470 } 471 472 module_init(mc68x328fb_init); 473 474 #ifdef MODULE 475 476 static void __exit mc68x328fb_cleanup(void) 477 { 478 unregister_framebuffer(&fb_info); 479 fb_dealloc_cmap(&fb_info.cmap); 480 } 481 482 module_exit(mc68x328fb_cleanup); 483 484 MODULE_LICENSE("GPL"); 485 #endif /* MODULE */ 486