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 static int mc68x328fb_check_var(struct fb_var_screeninfo *var, 88 struct fb_info *info); 89 static int mc68x328fb_set_par(struct fb_info *info); 90 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 91 u_int transp, struct fb_info *info); 92 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, 93 struct fb_info *info); 94 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma); 95 96 static const struct fb_ops mc68x328fb_ops = { 97 .owner = THIS_MODULE, 98 .fb_check_var = mc68x328fb_check_var, 99 .fb_set_par = mc68x328fb_set_par, 100 .fb_setcolreg = mc68x328fb_setcolreg, 101 .fb_pan_display = mc68x328fb_pan_display, 102 .fb_fillrect = cfb_fillrect, 103 .fb_copyarea = cfb_copyarea, 104 .fb_imageblit = cfb_imageblit, 105 .fb_mmap = mc68x328fb_mmap, 106 }; 107 108 /* 109 * Internal routines 110 */ 111 112 static u_long get_line_length(int xres_virtual, int bpp) 113 { 114 u_long length; 115 116 length = xres_virtual * bpp; 117 length = (length + 31) & ~31; 118 length >>= 3; 119 return (length); 120 } 121 122 /* 123 * Setting the video mode has been split into two parts. 124 * First part, xxxfb_check_var, must not write anything 125 * to hardware, it should only verify and adjust var. 126 * This means it doesn't alter par but it does use hardware 127 * data from it to check this var. 128 */ 129 130 static int mc68x328fb_check_var(struct fb_var_screeninfo *var, 131 struct fb_info *info) 132 { 133 u_long line_length; 134 135 /* 136 * FB_VMODE_CONUPDATE and FB_VMODE_SMOOTH_XPAN are equal! 137 * as FB_VMODE_SMOOTH_XPAN is only used internally 138 */ 139 140 if (var->vmode & FB_VMODE_CONUPDATE) { 141 var->vmode |= FB_VMODE_YWRAP; 142 var->xoffset = info->var.xoffset; 143 var->yoffset = info->var.yoffset; 144 } 145 146 /* 147 * Some very basic checks 148 */ 149 if (!var->xres) 150 var->xres = 1; 151 if (!var->yres) 152 var->yres = 1; 153 if (var->xres > var->xres_virtual) 154 var->xres_virtual = var->xres; 155 if (var->yres > var->yres_virtual) 156 var->yres_virtual = var->yres; 157 if (var->bits_per_pixel <= 1) 158 var->bits_per_pixel = 1; 159 else if (var->bits_per_pixel <= 8) 160 var->bits_per_pixel = 8; 161 else if (var->bits_per_pixel <= 16) 162 var->bits_per_pixel = 16; 163 else if (var->bits_per_pixel <= 24) 164 var->bits_per_pixel = 24; 165 else if (var->bits_per_pixel <= 32) 166 var->bits_per_pixel = 32; 167 else 168 return -EINVAL; 169 170 if (var->xres_virtual < var->xoffset + var->xres) 171 var->xres_virtual = var->xoffset + var->xres; 172 if (var->yres_virtual < var->yoffset + var->yres) 173 var->yres_virtual = var->yoffset + var->yres; 174 175 /* 176 * Memory limit 177 */ 178 line_length = 179 get_line_length(var->xres_virtual, var->bits_per_pixel); 180 if (line_length * var->yres_virtual > videomemorysize) 181 return -ENOMEM; 182 183 /* 184 * Now that we checked it we alter var. The reason being is that the video 185 * mode passed in might not work but slight changes to it might make it 186 * work. This way we let the user know what is acceptable. 187 */ 188 switch (var->bits_per_pixel) { 189 case 1: 190 var->red.offset = 0; 191 var->red.length = 1; 192 var->green.offset = 0; 193 var->green.length = 1; 194 var->blue.offset = 0; 195 var->blue.length = 1; 196 var->transp.offset = 0; 197 var->transp.length = 0; 198 break; 199 case 8: 200 var->red.offset = 0; 201 var->red.length = 8; 202 var->green.offset = 0; 203 var->green.length = 8; 204 var->blue.offset = 0; 205 var->blue.length = 8; 206 var->transp.offset = 0; 207 var->transp.length = 0; 208 break; 209 case 16: /* RGBA 5551 */ 210 if (var->transp.length) { 211 var->red.offset = 0; 212 var->red.length = 5; 213 var->green.offset = 5; 214 var->green.length = 5; 215 var->blue.offset = 10; 216 var->blue.length = 5; 217 var->transp.offset = 15; 218 var->transp.length = 1; 219 } else { /* RGB 565 */ 220 var->red.offset = 0; 221 var->red.length = 5; 222 var->green.offset = 5; 223 var->green.length = 6; 224 var->blue.offset = 11; 225 var->blue.length = 5; 226 var->transp.offset = 0; 227 var->transp.length = 0; 228 } 229 break; 230 case 24: /* RGB 888 */ 231 var->red.offset = 0; 232 var->red.length = 8; 233 var->green.offset = 8; 234 var->green.length = 8; 235 var->blue.offset = 16; 236 var->blue.length = 8; 237 var->transp.offset = 0; 238 var->transp.length = 0; 239 break; 240 case 32: /* RGBA 8888 */ 241 var->red.offset = 0; 242 var->red.length = 8; 243 var->green.offset = 8; 244 var->green.length = 8; 245 var->blue.offset = 16; 246 var->blue.length = 8; 247 var->transp.offset = 24; 248 var->transp.length = 8; 249 break; 250 } 251 var->red.msb_right = 0; 252 var->green.msb_right = 0; 253 var->blue.msb_right = 0; 254 var->transp.msb_right = 0; 255 256 return 0; 257 } 258 259 /* This routine actually sets the video mode. It's in here where we 260 * the hardware state info->par and fix which can be affected by the 261 * change in par. For this driver it doesn't do much. 262 */ 263 static int mc68x328fb_set_par(struct fb_info *info) 264 { 265 info->fix.line_length = get_line_length(info->var.xres_virtual, 266 info->var.bits_per_pixel); 267 return 0; 268 } 269 270 /* 271 * Set a single color register. The values supplied are already 272 * rounded down to the hardware's capabilities (according to the 273 * entries in the var structure). Return != 0 for invalid regno. 274 */ 275 276 static int mc68x328fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, 277 u_int transp, struct fb_info *info) 278 { 279 if (regno >= 256) /* no. of hw registers */ 280 return 1; 281 /* 282 * Program hardware... do anything you want with transp 283 */ 284 285 /* grayscale works only partially under directcolor */ 286 if (info->var.grayscale) { 287 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 288 red = green = blue = 289 (red * 77 + green * 151 + blue * 28) >> 8; 290 } 291 292 /* Directcolor: 293 * var->{color}.offset contains start of bitfield 294 * var->{color}.length contains length of bitfield 295 * {hardwarespecific} contains width of RAMDAC 296 * cmap[X] is programmed to (X << red.offset) | (X << green.offset) | (X << blue.offset) 297 * RAMDAC[X] is programmed to (red, green, blue) 298 * 299 * Pseudocolor: 300 * uses offset = 0 && length = RAMDAC register width. 301 * var->{color}.offset is 0 302 * var->{color}.length contains width of DAC 303 * cmap is not used 304 * RAMDAC[X] is programmed to (red, green, blue) 305 * Truecolor: 306 * does not use DAC. Usually 3 are present. 307 * var->{color}.offset contains start of bitfield 308 * var->{color}.length contains length of bitfield 309 * cmap is programmed to (red << red.offset) | (green << green.offset) | 310 * (blue << blue.offset) | (transp << transp.offset) 311 * RAMDAC does not exist 312 */ 313 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) 314 switch (info->fix.visual) { 315 case FB_VISUAL_TRUECOLOR: 316 case FB_VISUAL_PSEUDOCOLOR: 317 red = CNVT_TOHW(red, info->var.red.length); 318 green = CNVT_TOHW(green, info->var.green.length); 319 blue = CNVT_TOHW(blue, info->var.blue.length); 320 transp = CNVT_TOHW(transp, info->var.transp.length); 321 break; 322 case FB_VISUAL_DIRECTCOLOR: 323 red = CNVT_TOHW(red, 8); /* expect 8 bit DAC */ 324 green = CNVT_TOHW(green, 8); 325 blue = CNVT_TOHW(blue, 8); 326 /* hey, there is bug in transp handling... */ 327 transp = CNVT_TOHW(transp, 8); 328 break; 329 } 330 #undef CNVT_TOHW 331 /* Truecolor has hardware independent palette */ 332 if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 333 u32 v; 334 335 if (regno >= 16) 336 return 1; 337 338 v = (red << info->var.red.offset) | 339 (green << info->var.green.offset) | 340 (blue << info->var.blue.offset) | 341 (transp << info->var.transp.offset); 342 switch (info->var.bits_per_pixel) { 343 case 8: 344 break; 345 case 16: 346 ((u32 *) (info->pseudo_palette))[regno] = v; 347 break; 348 case 24: 349 case 32: 350 ((u32 *) (info->pseudo_palette))[regno] = v; 351 break; 352 } 353 return 0; 354 } 355 return 0; 356 } 357 358 /* 359 * Pan or Wrap the Display 360 * 361 * This call looks only at xoffset, yoffset and the FB_VMODE_YWRAP flag 362 */ 363 364 static int mc68x328fb_pan_display(struct fb_var_screeninfo *var, 365 struct fb_info *info) 366 { 367 if (var->vmode & FB_VMODE_YWRAP) { 368 if (var->yoffset < 0 369 || var->yoffset >= info->var.yres_virtual 370 || var->xoffset) 371 return -EINVAL; 372 } else { 373 if (var->xoffset + info->var.xres > info->var.xres_virtual || 374 var->yoffset + info->var.yres > info->var.yres_virtual) 375 return -EINVAL; 376 } 377 info->var.xoffset = var->xoffset; 378 info->var.yoffset = var->yoffset; 379 if (var->vmode & FB_VMODE_YWRAP) 380 info->var.vmode |= FB_VMODE_YWRAP; 381 else 382 info->var.vmode &= ~FB_VMODE_YWRAP; 383 return 0; 384 } 385 386 /* 387 * Most drivers don't need their own mmap function 388 */ 389 390 static int mc68x328fb_mmap(struct fb_info *info, struct vm_area_struct *vma) 391 { 392 #ifndef MMU 393 /* this is uClinux (no MMU) specific code */ 394 395 vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); 396 vma->vm_start = videomemory; 397 398 return 0; 399 #else 400 return -EINVAL; 401 #endif 402 } 403 404 static int __init mc68x328fb_setup(char *options) 405 { 406 if (!options || !*options) 407 return 1; 408 return 1; 409 } 410 411 /* 412 * Initialisation 413 */ 414 415 static int __init mc68x328fb_init(void) 416 { 417 #ifndef MODULE 418 char *option = NULL; 419 420 if (fb_get_options("68328fb", &option)) 421 return -ENODEV; 422 mc68x328fb_setup(option); 423 #endif 424 /* 425 * initialize the default mode from the LCD controller registers 426 */ 427 mc68x328fb_default.xres = LXMAX; 428 mc68x328fb_default.yres = LYMAX+1; 429 mc68x328fb_default.xres_virtual = mc68x328fb_default.xres; 430 mc68x328fb_default.yres_virtual = mc68x328fb_default.yres; 431 mc68x328fb_default.bits_per_pixel = 1 + (LPICF & 0x01); 432 videomemory = LSSA; 433 videomemorysize = (mc68x328fb_default.xres_virtual+7) / 8 * 434 mc68x328fb_default.yres_virtual * mc68x328fb_default.bits_per_pixel; 435 436 fb_info.screen_base = (void *)videomemory; 437 fb_info.fbops = &mc68x328fb_ops; 438 fb_info.var = mc68x328fb_default; 439 fb_info.fix = mc68x328fb_fix; 440 fb_info.fix.smem_start = videomemory; 441 fb_info.fix.smem_len = videomemorysize; 442 fb_info.fix.line_length = 443 get_line_length(mc68x328fb_default.xres_virtual, mc68x328fb_default.bits_per_pixel); 444 fb_info.fix.visual = (mc68x328fb_default.bits_per_pixel) == 1 ? 445 FB_VISUAL_MONO10 : FB_VISUAL_PSEUDOCOLOR; 446 if (fb_info.var.bits_per_pixel == 1) { 447 fb_info.var.red.length = fb_info.var.green.length = fb_info.var.blue.length = 1; 448 fb_info.var.red.offset = fb_info.var.green.offset = fb_info.var.blue.offset = 0; 449 } 450 fb_info.pseudo_palette = &mc68x328fb_pseudo_palette; 451 fb_info.flags = FBINFO_HWACCEL_YPAN; 452 453 if (fb_alloc_cmap(&fb_info.cmap, 256, 0)) 454 return -ENOMEM; 455 456 if (register_framebuffer(&fb_info) < 0) { 457 fb_dealloc_cmap(&fb_info.cmap); 458 return -EINVAL; 459 } 460 461 fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id); 462 fb_info(&fb_info, "%dx%dx%d at 0x%08lx\n", 463 mc68x328fb_default.xres_virtual, 464 mc68x328fb_default.yres_virtual, 465 1 << mc68x328fb_default.bits_per_pixel, videomemory); 466 467 return 0; 468 } 469 470 module_init(mc68x328fb_init); 471 472 #ifdef MODULE 473 474 static void __exit mc68x328fb_cleanup(void) 475 { 476 unregister_framebuffer(&fb_info); 477 fb_dealloc_cmap(&fb_info.cmap); 478 } 479 480 module_exit(mc68x328fb_cleanup); 481 482 MODULE_LICENSE("GPL"); 483 #endif /* MODULE */ 484