1 /* 2 * Driver for Aeroflex Gaisler SVGACTRL framebuffer device. 3 * 4 * 2011 (c) Aeroflex Gaisler AB 5 * 6 * Full documentation of the core can be found here: 7 * http://www.gaisler.com/products/grlib/grip.pdf 8 * 9 * This program is free software; you can redistribute it and/or modify it 10 * under the terms of the GNU General Public License as published by the 11 * Free Software Foundation; either version 2 of the License, or (at your 12 * option) any later version. 13 * 14 * Contributors: Kristoffer Glembo <kristoffer@gaisler.com> 15 * 16 */ 17 18 #include <linux/platform_device.h> 19 #include <linux/dma-mapping.h> 20 #include <linux/of_platform.h> 21 #include <linux/of_device.h> 22 #include <linux/module.h> 23 #include <linux/kernel.h> 24 #include <linux/string.h> 25 #include <linux/delay.h> 26 #include <linux/errno.h> 27 #include <linux/init.h> 28 #include <linux/slab.h> 29 #include <linux/tty.h> 30 #include <linux/mm.h> 31 #include <linux/fb.h> 32 #include <linux/io.h> 33 34 struct grvga_regs { 35 u32 status; /* 0x00 */ 36 u32 video_length; /* 0x04 */ 37 u32 front_porch; /* 0x08 */ 38 u32 sync_length; /* 0x0C */ 39 u32 line_length; /* 0x10 */ 40 u32 fb_pos; /* 0x14 */ 41 u32 clk_vector[4]; /* 0x18 */ 42 u32 clut; /* 0x20 */ 43 }; 44 45 struct grvga_par { 46 struct grvga_regs *regs; 47 u32 color_palette[16]; /* 16 entry pseudo palette used by fbcon in true color mode */ 48 int clk_sel; 49 int fb_alloced; /* = 1 if framebuffer is allocated in main memory */ 50 }; 51 52 53 static const struct fb_videomode grvga_modedb[] = { 54 { 55 /* 640x480 @ 60 Hz */ 56 NULL, 60, 640, 480, 40000, 48, 16, 39, 11, 96, 2, 57 0, FB_VMODE_NONINTERLACED 58 }, { 59 /* 800x600 @ 60 Hz */ 60 NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4, 61 0, FB_VMODE_NONINTERLACED 62 }, { 63 /* 800x600 @ 72 Hz */ 64 NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6, 65 0, FB_VMODE_NONINTERLACED 66 }, { 67 /* 1024x768 @ 60 Hz */ 68 NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6, 69 0, FB_VMODE_NONINTERLACED 70 } 71 }; 72 73 static struct fb_fix_screeninfo grvga_fix = { 74 .id = "AG SVGACTRL", 75 .type = FB_TYPE_PACKED_PIXELS, 76 .visual = FB_VISUAL_PSEUDOCOLOR, 77 .xpanstep = 0, 78 .ypanstep = 1, 79 .ywrapstep = 0, 80 .accel = FB_ACCEL_NONE, 81 }; 82 83 static int grvga_check_var(struct fb_var_screeninfo *var, 84 struct fb_info *info) 85 { 86 struct grvga_par *par = info->par; 87 int i; 88 89 if (!var->xres) 90 var->xres = 1; 91 if (!var->yres) 92 var->yres = 1; 93 if (var->bits_per_pixel <= 8) 94 var->bits_per_pixel = 8; 95 else if (var->bits_per_pixel <= 16) 96 var->bits_per_pixel = 16; 97 else if (var->bits_per_pixel <= 24) 98 var->bits_per_pixel = 24; 99 else if (var->bits_per_pixel <= 32) 100 var->bits_per_pixel = 32; 101 else 102 return -EINVAL; 103 104 var->xres_virtual = var->xres; 105 var->yres_virtual = 2*var->yres; 106 107 if (info->fix.smem_len) { 108 if ((var->yres_virtual*var->xres_virtual*var->bits_per_pixel/8) > info->fix.smem_len) 109 return -ENOMEM; 110 } 111 112 /* Which clocks that are available can be read out in these registers */ 113 for (i = 0; i <= 3 ; i++) { 114 if (var->pixclock == par->regs->clk_vector[i]) 115 break; 116 } 117 if (i <= 3) 118 par->clk_sel = i; 119 else 120 return -EINVAL; 121 122 switch (info->var.bits_per_pixel) { 123 case 8: 124 var->red = (struct fb_bitfield) {0, 8, 0}; /* offset, length, msb-right */ 125 var->green = (struct fb_bitfield) {0, 8, 0}; 126 var->blue = (struct fb_bitfield) {0, 8, 0}; 127 var->transp = (struct fb_bitfield) {0, 0, 0}; 128 break; 129 case 16: 130 var->red = (struct fb_bitfield) {11, 5, 0}; 131 var->green = (struct fb_bitfield) {5, 6, 0}; 132 var->blue = (struct fb_bitfield) {0, 5, 0}; 133 var->transp = (struct fb_bitfield) {0, 0, 0}; 134 break; 135 case 24: 136 case 32: 137 var->red = (struct fb_bitfield) {16, 8, 0}; 138 var->green = (struct fb_bitfield) {8, 8, 0}; 139 var->blue = (struct fb_bitfield) {0, 8, 0}; 140 var->transp = (struct fb_bitfield) {24, 8, 0}; 141 break; 142 default: 143 return -EINVAL; 144 } 145 146 return 0; 147 } 148 149 static int grvga_set_par(struct fb_info *info) 150 { 151 152 u32 func = 0; 153 struct grvga_par *par = info->par; 154 155 __raw_writel(((info->var.yres - 1) << 16) | (info->var.xres - 1), 156 &par->regs->video_length); 157 158 __raw_writel((info->var.lower_margin << 16) | (info->var.right_margin), 159 &par->regs->front_porch); 160 161 __raw_writel((info->var.vsync_len << 16) | (info->var.hsync_len), 162 &par->regs->sync_length); 163 164 __raw_writel(((info->var.yres + info->var.lower_margin + info->var.upper_margin + info->var.vsync_len - 1) << 16) | 165 (info->var.xres + info->var.right_margin + info->var.left_margin + info->var.hsync_len - 1), 166 &par->regs->line_length); 167 168 switch (info->var.bits_per_pixel) { 169 case 8: 170 info->fix.visual = FB_VISUAL_PSEUDOCOLOR; 171 func = 1; 172 break; 173 case 16: 174 info->fix.visual = FB_VISUAL_TRUECOLOR; 175 func = 2; 176 break; 177 case 24: 178 case 32: 179 info->fix.visual = FB_VISUAL_TRUECOLOR; 180 func = 3; 181 break; 182 default: 183 return -EINVAL; 184 } 185 186 __raw_writel((par->clk_sel << 6) | (func << 4) | 1, 187 &par->regs->status); 188 189 info->fix.line_length = (info->var.xres_virtual*info->var.bits_per_pixel)/8; 190 return 0; 191 } 192 193 static int grvga_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info) 194 { 195 struct grvga_par *par; 196 par = info->par; 197 198 if (regno >= 256) /* Size of CLUT */ 199 return -EINVAL; 200 201 if (info->var.grayscale) { 202 /* grayscale = 0.30*R + 0.59*G + 0.11*B */ 203 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; 204 } 205 206 207 208 #define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16) 209 210 red = CNVT_TOHW(red, info->var.red.length); 211 green = CNVT_TOHW(green, info->var.green.length); 212 blue = CNVT_TOHW(blue, info->var.blue.length); 213 transp = CNVT_TOHW(transp, info->var.transp.length); 214 215 #undef CNVT_TOHW 216 217 /* In PSEUDOCOLOR we use the hardware CLUT */ 218 if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR) 219 __raw_writel((regno << 24) | (red << 16) | (green << 8) | blue, 220 &par->regs->clut); 221 222 /* Truecolor uses the pseudo palette */ 223 else if (info->fix.visual == FB_VISUAL_TRUECOLOR) { 224 u32 v; 225 if (regno >= 16) 226 return -EINVAL; 227 228 229 v = (red << info->var.red.offset) | 230 (green << info->var.green.offset) | 231 (blue << info->var.blue.offset) | 232 (transp << info->var.transp.offset); 233 234 ((u32 *) (info->pseudo_palette))[regno] = v; 235 } 236 return 0; 237 } 238 239 static int grvga_pan_display(struct fb_var_screeninfo *var, 240 struct fb_info *info) 241 { 242 struct grvga_par *par = info->par; 243 struct fb_fix_screeninfo *fix = &info->fix; 244 u32 base_addr; 245 246 if (var->xoffset != 0) 247 return -EINVAL; 248 249 base_addr = fix->smem_start + (var->yoffset * fix->line_length); 250 base_addr &= ~3UL; 251 252 /* Set framebuffer base address */ 253 __raw_writel(base_addr, 254 &par->regs->fb_pos); 255 256 return 0; 257 } 258 259 static struct fb_ops grvga_ops = { 260 .owner = THIS_MODULE, 261 .fb_check_var = grvga_check_var, 262 .fb_set_par = grvga_set_par, 263 .fb_setcolreg = grvga_setcolreg, 264 .fb_pan_display = grvga_pan_display, 265 .fb_fillrect = cfb_fillrect, 266 .fb_copyarea = cfb_copyarea, 267 .fb_imageblit = cfb_imageblit 268 }; 269 270 static int grvga_parse_custom(char *options, 271 struct fb_var_screeninfo *screendata) 272 { 273 char *this_opt; 274 int count = 0; 275 if (!options || !*options) 276 return -1; 277 278 while ((this_opt = strsep(&options, " ")) != NULL) { 279 if (!*this_opt) 280 continue; 281 282 switch (count) { 283 case 0: 284 screendata->pixclock = simple_strtoul(this_opt, NULL, 0); 285 count++; 286 break; 287 case 1: 288 screendata->xres = screendata->xres_virtual = simple_strtoul(this_opt, NULL, 0); 289 count++; 290 break; 291 case 2: 292 screendata->right_margin = simple_strtoul(this_opt, NULL, 0); 293 count++; 294 break; 295 case 3: 296 screendata->hsync_len = simple_strtoul(this_opt, NULL, 0); 297 count++; 298 break; 299 case 4: 300 screendata->left_margin = simple_strtoul(this_opt, NULL, 0); 301 count++; 302 break; 303 case 5: 304 screendata->yres = screendata->yres_virtual = simple_strtoul(this_opt, NULL, 0); 305 count++; 306 break; 307 case 6: 308 screendata->lower_margin = simple_strtoul(this_opt, NULL, 0); 309 count++; 310 break; 311 case 7: 312 screendata->vsync_len = simple_strtoul(this_opt, NULL, 0); 313 count++; 314 break; 315 case 8: 316 screendata->upper_margin = simple_strtoul(this_opt, NULL, 0); 317 count++; 318 break; 319 case 9: 320 screendata->bits_per_pixel = simple_strtoul(this_opt, NULL, 0); 321 count++; 322 break; 323 default: 324 return -1; 325 } 326 } 327 screendata->activate = FB_ACTIVATE_NOW; 328 screendata->vmode = FB_VMODE_NONINTERLACED; 329 return 0; 330 } 331 332 static int grvga_probe(struct platform_device *dev) 333 { 334 struct fb_info *info; 335 int retval = -ENOMEM; 336 unsigned long virtual_start; 337 unsigned long grvga_fix_addr = 0; 338 unsigned long physical_start = 0; 339 unsigned long grvga_mem_size = 0; 340 struct grvga_par *par = NULL; 341 char *options = NULL, *mode_opt = NULL; 342 343 info = framebuffer_alloc(sizeof(struct grvga_par), &dev->dev); 344 if (!info) { 345 dev_err(&dev->dev, "framebuffer_alloc failed\n"); 346 return -ENOMEM; 347 } 348 349 /* Expecting: "grvga: modestring, [addr:<framebuffer physical address>], [size:<framebuffer size>] 350 * 351 * If modestring is custom:<custom mode string> we parse the string which then contains all videoparameters 352 * If address is left out, we allocate memory, 353 * if size is left out we only allocate enough to support the given mode. 354 */ 355 if (fb_get_options("grvga", &options)) { 356 retval = -ENODEV; 357 goto free_fb; 358 } 359 360 if (!options || !*options) 361 options = "640x480-8@60"; 362 363 while (1) { 364 char *this_opt = strsep(&options, ","); 365 366 if (!this_opt) 367 break; 368 369 if (!strncmp(this_opt, "custom", 6)) { 370 if (grvga_parse_custom(this_opt, &info->var) < 0) { 371 dev_err(&dev->dev, "Failed to parse custom mode (%s).\n", this_opt); 372 retval = -EINVAL; 373 goto free_fb; 374 } 375 } else if (!strncmp(this_opt, "addr", 4)) 376 grvga_fix_addr = simple_strtoul(this_opt + 5, NULL, 16); 377 else if (!strncmp(this_opt, "size", 4)) 378 grvga_mem_size = simple_strtoul(this_opt + 5, NULL, 0); 379 else 380 mode_opt = this_opt; 381 } 382 383 par = info->par; 384 info->fbops = &grvga_ops; 385 info->fix = grvga_fix; 386 info->pseudo_palette = par->color_palette; 387 info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK | FBINFO_HWACCEL_YPAN; 388 info->fix.smem_len = grvga_mem_size; 389 390 if (!devm_request_mem_region(&dev->dev, dev->resource[0].start, 391 resource_size(&dev->resource[0]), "grlib-svgactrl regs")) { 392 dev_err(&dev->dev, "registers already mapped\n"); 393 retval = -EBUSY; 394 goto free_fb; 395 } 396 397 par->regs = of_ioremap(&dev->resource[0], 0, 398 resource_size(&dev->resource[0]), 399 "grlib-svgactrl regs"); 400 401 if (!par->regs) { 402 dev_err(&dev->dev, "failed to map registers\n"); 403 retval = -ENOMEM; 404 goto free_fb; 405 } 406 407 retval = fb_alloc_cmap(&info->cmap, 256, 0); 408 if (retval < 0) { 409 dev_err(&dev->dev, "failed to allocate mem with fb_alloc_cmap\n"); 410 retval = -ENOMEM; 411 goto unmap_regs; 412 } 413 414 if (mode_opt) { 415 retval = fb_find_mode(&info->var, info, mode_opt, 416 grvga_modedb, sizeof(grvga_modedb), &grvga_modedb[0], 8); 417 if (!retval || retval == 4) { 418 retval = -EINVAL; 419 goto dealloc_cmap; 420 } 421 } 422 423 if (!grvga_mem_size) 424 grvga_mem_size = info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel/8; 425 426 if (grvga_fix_addr) { 427 /* Got framebuffer base address from argument list */ 428 429 physical_start = grvga_fix_addr; 430 431 if (!devm_request_mem_region(&dev->dev, physical_start, 432 grvga_mem_size, dev->name)) { 433 dev_err(&dev->dev, "failed to request memory region\n"); 434 retval = -ENOMEM; 435 goto dealloc_cmap; 436 } 437 438 virtual_start = (unsigned long) ioremap(physical_start, grvga_mem_size); 439 440 if (!virtual_start) { 441 dev_err(&dev->dev, "error mapping framebuffer memory\n"); 442 retval = -ENOMEM; 443 goto dealloc_cmap; 444 } 445 } else { /* Allocate frambuffer memory */ 446 447 unsigned long page; 448 449 virtual_start = (unsigned long) __get_free_pages(GFP_DMA, 450 get_order(grvga_mem_size)); 451 if (!virtual_start) { 452 dev_err(&dev->dev, 453 "unable to allocate framebuffer memory (%lu bytes)\n", 454 grvga_mem_size); 455 retval = -ENOMEM; 456 goto dealloc_cmap; 457 } 458 459 physical_start = dma_map_single(&dev->dev, (void *)virtual_start, grvga_mem_size, DMA_TO_DEVICE); 460 461 /* Set page reserved so that mmap will work. This is necessary 462 * since we'll be remapping normal memory. 463 */ 464 for (page = virtual_start; 465 page < PAGE_ALIGN(virtual_start + grvga_mem_size); 466 page += PAGE_SIZE) { 467 SetPageReserved(virt_to_page(page)); 468 } 469 470 par->fb_alloced = 1; 471 } 472 473 memset((unsigned long *) virtual_start, 0, grvga_mem_size); 474 475 info->screen_base = (char __iomem *) virtual_start; 476 info->fix.smem_start = physical_start; 477 info->fix.smem_len = grvga_mem_size; 478 479 dev_set_drvdata(&dev->dev, info); 480 481 dev_info(&dev->dev, 482 "Aeroflex Gaisler framebuffer device (fb%d), %dx%d-%d, using %luK of video memory @ %p\n", 483 info->node, info->var.xres, info->var.yres, info->var.bits_per_pixel, 484 grvga_mem_size >> 10, info->screen_base); 485 486 retval = register_framebuffer(info); 487 if (retval < 0) { 488 dev_err(&dev->dev, "failed to register framebuffer\n"); 489 goto free_mem; 490 } 491 492 __raw_writel(physical_start, &par->regs->fb_pos); 493 __raw_writel(__raw_readl(&par->regs->status) | 1, /* Enable framebuffer */ 494 &par->regs->status); 495 496 return 0; 497 498 free_mem: 499 if (grvga_fix_addr) 500 iounmap((void *)virtual_start); 501 else 502 kfree((void *)virtual_start); 503 dealloc_cmap: 504 fb_dealloc_cmap(&info->cmap); 505 unmap_regs: 506 of_iounmap(&dev->resource[0], par->regs, 507 resource_size(&dev->resource[0])); 508 free_fb: 509 framebuffer_release(info); 510 511 return retval; 512 } 513 514 static int grvga_remove(struct platform_device *device) 515 { 516 struct fb_info *info = dev_get_drvdata(&device->dev); 517 struct grvga_par *par; 518 519 if (info) { 520 par = info->par; 521 unregister_framebuffer(info); 522 fb_dealloc_cmap(&info->cmap); 523 524 of_iounmap(&device->resource[0], par->regs, 525 resource_size(&device->resource[0])); 526 527 if (!par->fb_alloced) 528 iounmap(info->screen_base); 529 else 530 kfree((void *)info->screen_base); 531 532 framebuffer_release(info); 533 } 534 535 return 0; 536 } 537 538 static struct of_device_id svgactrl_of_match[] = { 539 { 540 .name = "GAISLER_SVGACTRL", 541 }, 542 { 543 .name = "01_063", 544 }, 545 {}, 546 }; 547 MODULE_DEVICE_TABLE(of, svgactrl_of_match); 548 549 static struct platform_driver grvga_driver = { 550 .driver = { 551 .name = "grlib-svgactrl", 552 .owner = THIS_MODULE, 553 .of_match_table = svgactrl_of_match, 554 }, 555 .probe = grvga_probe, 556 .remove = grvga_remove, 557 }; 558 559 module_platform_driver(grvga_driver); 560 561 MODULE_LICENSE("GPL"); 562 MODULE_AUTHOR("Aeroflex Gaisler"); 563 MODULE_DESCRIPTION("Aeroflex Gaisler framebuffer device driver"); 564