1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * A framebuffer driver for VBE 2.0+ compliant video cards 4 * 5 * (c) 2007 Michal Januszewski <spock@gentoo.org> 6 * Loosely based upon the vesafb driver. 7 * 8 */ 9 10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 11 12#include <linux/init.h> 13#include <linux/module.h> 14#include <linux/moduleparam.h> 15#include <linux/skbuff.h> 16#include <linux/timer.h> 17#include <linux/completion.h> 18#include <linux/connector.h> 19#include <linux/random.h> 20#include <linux/platform_device.h> 21#include <linux/limits.h> 22#include <linux/fb.h> 23#include <linux/io.h> 24#include <linux/mutex.h> 25#include <linux/slab.h> 26#include <video/edid.h> 27#include <video/uvesafb.h> 28#ifdef CONFIG_X86 29#include <video/vga.h> 30#endif 31#include "edid.h" 32 33static struct cb_id uvesafb_cn_id = { 34 .idx = CN_IDX_V86D, 35 .val = CN_VAL_V86D_UVESAFB 36}; 37static char v86d_path[PATH_MAX] = "/sbin/v86d"; 38static char v86d_started; /* has v86d been started by uvesafb? */ 39 40static const struct fb_fix_screeninfo uvesafb_fix = { 41 .id = "VESA VGA", 42 .type = FB_TYPE_PACKED_PIXELS, 43 .accel = FB_ACCEL_NONE, 44 .visual = FB_VISUAL_TRUECOLOR, 45}; 46 47static int mtrr = 3; /* enable mtrr by default */ 48static bool blank = true; /* enable blanking by default */ 49static int ypan = 1; /* 0: scroll, 1: ypan, 2: ywrap */ 50static bool pmi_setpal = true; /* use PMI for palette changes */ 51static bool nocrtc; /* ignore CRTC settings */ 52static bool noedid; /* don't try DDC transfers */ 53static int vram_remap; /* set amt. of memory to be used */ 54static int vram_total; /* set total amount of memory */ 55static u16 maxclk; /* maximum pixel clock */ 56static u16 maxvf; /* maximum vertical frequency */ 57static u16 maxhf; /* maximum horizontal frequency */ 58static u16 vbemode; /* force use of a specific VBE mode */ 59static char *mode_option; 60static u8 dac_width = 6; 61 62static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX]; 63static DEFINE_MUTEX(uvfb_lock); 64 65/* 66 * A handler for replies from userspace. 67 * 68 * Make sure each message passes consistency checks and if it does, 69 * find the kernel part of the task struct, copy the registers and 70 * the buffer contents and then complete the task. 71 */ 72static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp) 73{ 74 struct uvesafb_task *utask; 75 struct uvesafb_ktask *task; 76 77 if (!capable(CAP_SYS_ADMIN)) 78 return; 79 80 if (msg->seq >= UVESAFB_TASKS_MAX) 81 return; 82 83 mutex_lock(&uvfb_lock); 84 task = uvfb_tasks[msg->seq]; 85 86 if (!task || msg->ack != task->ack) { 87 mutex_unlock(&uvfb_lock); 88 return; 89 } 90 91 utask = (struct uvesafb_task *)msg->data; 92 93 /* Sanity checks for the buffer length. */ 94 if (task->t.buf_len < utask->buf_len || 95 utask->buf_len > msg->len - sizeof(*utask)) { 96 mutex_unlock(&uvfb_lock); 97 return; 98 } 99 100 uvfb_tasks[msg->seq] = NULL; 101 mutex_unlock(&uvfb_lock); 102 103 memcpy(&task->t, utask, sizeof(*utask)); 104 105 if (task->t.buf_len && task->buf) 106 memcpy(task->buf, utask + 1, task->t.buf_len); 107 108 complete(task->done); 109 return; 110} 111 112static int uvesafb_helper_start(void) 113{ 114 char *envp[] = { 115 "HOME=/", 116 "PATH=/sbin:/bin", 117 NULL, 118 }; 119 120 char *argv[] = { 121 v86d_path, 122 NULL, 123 }; 124 125 return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC); 126} 127 128/* 129 * Execute a uvesafb task. 130 * 131 * Returns 0 if the task is executed successfully. 132 * 133 * A message sent to the userspace consists of the uvesafb_task 134 * struct and (optionally) a buffer. The uvesafb_task struct is 135 * a simplified version of uvesafb_ktask (its kernel counterpart) 136 * containing only the register values, flags and the length of 137 * the buffer. 138 * 139 * Each message is assigned a sequence number (increased linearly) 140 * and a random ack number. The sequence number is used as a key 141 * for the uvfb_tasks array which holds pointers to uvesafb_ktask 142 * structs for all requests. 143 */ 144static int uvesafb_exec(struct uvesafb_ktask *task) 145{ 146 static int seq; 147 struct cn_msg *m; 148 int err; 149 int len = sizeof(task->t) + task->t.buf_len; 150 151 /* 152 * Check whether the message isn't longer than the maximum 153 * allowed by connector. 154 */ 155 if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) { 156 pr_warn("message too long (%d), can't execute task\n", 157 (int)(sizeof(*m) + len)); 158 return -E2BIG; 159 } 160 161 m = kzalloc(sizeof(*m) + len, GFP_KERNEL); 162 if (!m) 163 return -ENOMEM; 164 165 init_completion(task->done); 166 167 memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id)); 168 m->seq = seq; 169 m->len = len; 170 m->ack = get_random_u32(); 171 172 /* uvesafb_task structure */ 173 memcpy(m + 1, &task->t, sizeof(task->t)); 174 175 /* Buffer */ 176 memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len); 177 178 /* 179 * Save the message ack number so that we can find the kernel 180 * part of this task when a reply is received from userspace. 181 */ 182 task->ack = m->ack; 183 184 mutex_lock(&uvfb_lock); 185 186 /* If all slots are taken -- bail out. */ 187 if (uvfb_tasks[seq]) { 188 mutex_unlock(&uvfb_lock); 189 err = -EBUSY; 190 goto out; 191 } 192 193 /* Save a pointer to the kernel part of the task struct. */ 194 uvfb_tasks[seq] = task; 195 mutex_unlock(&uvfb_lock); 196 197 err = cn_netlink_send(m, 0, 0, GFP_KERNEL); 198 if (err == -ESRCH) { 199 /* 200 * Try to start the userspace helper if sending 201 * the request failed the first time. 202 */ 203 err = uvesafb_helper_start(); 204 if (err) { 205 pr_err("failed to execute %s\n", v86d_path); 206 pr_err("make sure that the v86d helper is installed and executable\n"); 207 } else { 208 v86d_started = 1; 209 err = cn_netlink_send(m, 0, 0, gfp_any()); 210 if (err == -ENOBUFS) 211 err = 0; 212 } 213 } else if (err == -ENOBUFS) 214 err = 0; 215 216 if (!err && !(task->t.flags & TF_EXIT)) 217 err = !wait_for_completion_timeout(task->done, 218 msecs_to_jiffies(UVESAFB_TIMEOUT)); 219 220 mutex_lock(&uvfb_lock); 221 uvfb_tasks[seq] = NULL; 222 mutex_unlock(&uvfb_lock); 223 224 seq++; 225 if (seq >= UVESAFB_TASKS_MAX) 226 seq = 0; 227out: 228 kfree(m); 229 return err; 230} 231 232/* 233 * Free a uvesafb_ktask struct. 234 */ 235static void uvesafb_free(struct uvesafb_ktask *task) 236{ 237 if (task) { 238 kfree(task->done); 239 kfree(task); 240 } 241} 242 243/* 244 * Prepare a uvesafb_ktask struct to be used again. 245 */ 246static void uvesafb_reset(struct uvesafb_ktask *task) 247{ 248 struct completion *cpl = task->done; 249 250 memset(task, 0, sizeof(*task)); 251 task->done = cpl; 252} 253 254/* 255 * Allocate and prepare a uvesafb_ktask struct. 256 */ 257static struct uvesafb_ktask *uvesafb_prep(void) 258{ 259 struct uvesafb_ktask *task; 260 261 task = kzalloc(sizeof(*task), GFP_KERNEL); 262 if (task) { 263 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL); 264 if (!task->done) { 265 kfree(task); 266 task = NULL; 267 } 268 } 269 return task; 270} 271 272static void uvesafb_setup_var(struct fb_var_screeninfo *var, 273 struct fb_info *info, struct vbe_mode_ib *mode) 274{ 275 struct uvesafb_par *par = info->par; 276 277 var->vmode = FB_VMODE_NONINTERLACED; 278 var->sync = FB_SYNC_VERT_HIGH_ACT; 279 280 var->xres = mode->x_res; 281 var->yres = mode->y_res; 282 var->xres_virtual = mode->x_res; 283 var->yres_virtual = (par->ypan) ? 284 info->fix.smem_len / mode->bytes_per_scan_line : 285 mode->y_res; 286 var->xoffset = 0; 287 var->yoffset = 0; 288 var->bits_per_pixel = mode->bits_per_pixel; 289 290 if (var->bits_per_pixel == 15) 291 var->bits_per_pixel = 16; 292 293 if (var->bits_per_pixel > 8) { 294 var->red.offset = mode->red_off; 295 var->red.length = mode->red_len; 296 var->green.offset = mode->green_off; 297 var->green.length = mode->green_len; 298 var->blue.offset = mode->blue_off; 299 var->blue.length = mode->blue_len; 300 var->transp.offset = mode->rsvd_off; 301 var->transp.length = mode->rsvd_len; 302 } else { 303 var->red.offset = 0; 304 var->green.offset = 0; 305 var->blue.offset = 0; 306 var->transp.offset = 0; 307 308 var->red.length = 8; 309 var->green.length = 8; 310 var->blue.length = 8; 311 var->transp.length = 0; 312 } 313} 314 315static int uvesafb_vbe_find_mode(struct uvesafb_par *par, 316 int xres, int yres, int depth, unsigned char flags) 317{ 318 int i, match = -1, h = 0, d = 0x7fffffff; 319 320 for (i = 0; i < par->vbe_modes_cnt; i++) { 321 h = abs(par->vbe_modes[i].x_res - xres) + 322 abs(par->vbe_modes[i].y_res - yres) + 323 abs(depth - par->vbe_modes[i].depth); 324 325 /* 326 * We have an exact match in terms of resolution 327 * and depth. 328 */ 329 if (h == 0) 330 return i; 331 332 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) { 333 d = h; 334 match = i; 335 } 336 } 337 i = 1; 338 339 if (flags & UVESAFB_EXACT_DEPTH && 340 par->vbe_modes[match].depth != depth) 341 i = 0; 342 343 if (flags & UVESAFB_EXACT_RES && d > 24) 344 i = 0; 345 346 if (i != 0) 347 return match; 348 else 349 return -1; 350} 351 352static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par) 353{ 354 struct uvesafb_ktask *task; 355 u8 *state; 356 int err; 357 358 if (!par->vbe_state_size) 359 return NULL; 360 361 state = kmalloc(par->vbe_state_size, GFP_KERNEL); 362 if (!state) 363 return ERR_PTR(-ENOMEM); 364 365 task = uvesafb_prep(); 366 if (!task) { 367 kfree(state); 368 return NULL; 369 } 370 371 task->t.regs.eax = 0x4f04; 372 task->t.regs.ecx = 0x000f; 373 task->t.regs.edx = 0x0001; 374 task->t.flags = TF_BUF_RET | TF_BUF_ESBX; 375 task->t.buf_len = par->vbe_state_size; 376 task->buf = state; 377 err = uvesafb_exec(task); 378 379 if (err || (task->t.regs.eax & 0xffff) != 0x004f) { 380 pr_warn("VBE get state call failed (eax=0x%x, err=%d)\n", 381 task->t.regs.eax, err); 382 kfree(state); 383 state = NULL; 384 } 385 386 uvesafb_free(task); 387 return state; 388} 389 390static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf) 391{ 392 struct uvesafb_ktask *task; 393 int err; 394 395 if (!state_buf) 396 return; 397 398 task = uvesafb_prep(); 399 if (!task) 400 return; 401 402 task->t.regs.eax = 0x4f04; 403 task->t.regs.ecx = 0x000f; 404 task->t.regs.edx = 0x0002; 405 task->t.buf_len = par->vbe_state_size; 406 task->t.flags = TF_BUF_ESBX; 407 task->buf = state_buf; 408 409 err = uvesafb_exec(task); 410 if (err || (task->t.regs.eax & 0xffff) != 0x004f) 411 pr_warn("VBE state restore call failed (eax=0x%x, err=%d)\n", 412 task->t.regs.eax, err); 413 414 uvesafb_free(task); 415} 416 417static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task, 418 struct uvesafb_par *par) 419{ 420 int err; 421 422 task->t.regs.eax = 0x4f00; 423 task->t.flags = TF_VBEIB; 424 task->t.buf_len = sizeof(struct vbe_ib); 425 task->buf = &par->vbe_ib; 426 memcpy(par->vbe_ib.vbe_signature, "VBE2", 4); 427 428 err = uvesafb_exec(task); 429 if (err || (task->t.regs.eax & 0xffff) != 0x004f) { 430 pr_err("Getting VBE info block failed (eax=0x%x, err=%d)\n", 431 (u32)task->t.regs.eax, err); 432 return -EINVAL; 433 } 434 435 if (par->vbe_ib.vbe_version < 0x0200) { 436 pr_err("Sorry, pre-VBE 2.0 cards are not supported\n"); 437 return -EINVAL; 438 } 439 440 if (!par->vbe_ib.mode_list_ptr) { 441 pr_err("Missing mode list!\n"); 442 return -EINVAL; 443 } 444 445 pr_info(""); 446 447 /* 448 * Convert string pointers and the mode list pointer into 449 * usable addresses. Print informational messages about the 450 * video adapter and its vendor. 451 */ 452 if (par->vbe_ib.oem_vendor_name_ptr) 453 pr_cont("%s, ", 454 ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr); 455 456 if (par->vbe_ib.oem_product_name_ptr) 457 pr_cont("%s, ", 458 ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr); 459 460 if (par->vbe_ib.oem_product_rev_ptr) 461 pr_cont("%s, ", 462 ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr); 463 464 if (par->vbe_ib.oem_string_ptr) 465 pr_cont("OEM: %s, ", 466 ((char *)task->buf) + par->vbe_ib.oem_string_ptr); 467 468 pr_cont("VBE v%d.%d\n", 469 (par->vbe_ib.vbe_version & 0xff00) >> 8, 470 par->vbe_ib.vbe_version & 0xff); 471 472 return 0; 473} 474 475static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task, 476 struct uvesafb_par *par) 477{ 478 int off = 0, err; 479 u16 *mode; 480 481 par->vbe_modes_cnt = 0; 482 483 /* Count available modes. */ 484 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr); 485 while (*mode != 0xffff) { 486 par->vbe_modes_cnt++; 487 mode++; 488 } 489 490 par->vbe_modes = kcalloc(par->vbe_modes_cnt, 491 sizeof(struct vbe_mode_ib), 492 GFP_KERNEL); 493 if (!par->vbe_modes) 494 return -ENOMEM; 495 496 /* Get info about all available modes. */ 497 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr); 498 while (*mode != 0xffff) { 499 struct vbe_mode_ib *mib; 500 501 uvesafb_reset(task); 502 task->t.regs.eax = 0x4f01; 503 task->t.regs.ecx = (u32) *mode; 504 task->t.flags = TF_BUF_RET | TF_BUF_ESDI; 505 task->t.buf_len = sizeof(struct vbe_mode_ib); 506 task->buf = par->vbe_modes + off; 507 508 err = uvesafb_exec(task); 509 if (err || (task->t.regs.eax & 0xffff) != 0x004f) { 510 pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n", 511 *mode, (u32)task->t.regs.eax, err); 512 mode++; 513 par->vbe_modes_cnt--; 514 continue; 515 } 516 517 mib = task->buf; 518 mib->mode_id = *mode; 519 520 /* 521 * We only want modes that are supported with the current 522 * hardware configuration, color, graphics and that have 523 * support for the LFB. 524 */ 525 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK && 526 mib->bits_per_pixel >= 8) 527 off++; 528 else 529 par->vbe_modes_cnt--; 530 531 mode++; 532 mib->depth = mib->red_len + mib->green_len + mib->blue_len; 533 534 /* 535 * Handle 8bpp modes and modes with broken color component 536 * lengths. 537 */ 538 if (mib->depth == 0 || (mib->depth == 24 && 539 mib->bits_per_pixel == 32)) 540 mib->depth = mib->bits_per_pixel; 541 } 542 543 if (par->vbe_modes_cnt > 0) 544 return 0; 545 else 546 return -EINVAL; 547} 548 549/* 550 * The Protected Mode Interface is 32-bit x86 code, so we only run it on 551 * x86 and not x86_64. 552 */ 553#ifdef CONFIG_X86_32 554static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task, 555 struct uvesafb_par *par) 556{ 557 int i, err; 558 559 uvesafb_reset(task); 560 task->t.regs.eax = 0x4f0a; 561 task->t.regs.ebx = 0x0; 562 err = uvesafb_exec(task); 563 if (err) 564 return err; 565 566 if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) { 567 par->pmi_setpal = par->ypan = 0; 568 } else { 569 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4) 570 + task->t.regs.edi); 571 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1]; 572 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2]; 573 pr_info("protected mode interface info at %04x:%04x\n", 574 (u16)task->t.regs.es, (u16)task->t.regs.edi); 575 pr_info("pmi: set display start = %p, set palette = %p\n", 576 par->pmi_start, par->pmi_pal); 577 578 if (par->pmi_base[3]) { 579 pr_info("pmi: ports ="); 580 for (i = par->pmi_base[3]/2; 581 par->pmi_base[i] != 0xffff; i++) 582 pr_cont(" %x", par->pmi_base[i]); 583 pr_cont("\n"); 584 585 if (par->pmi_base[i] != 0xffff) { 586 pr_info("can't handle memory requests, pmi disabled\n"); 587 par->ypan = par->pmi_setpal = 0; 588 } 589 } 590 } 591 return 0; 592} 593#endif /* CONFIG_X86_32 */ 594 595/* 596 * Check whether a video mode is supported by the Video BIOS and is 597 * compatible with the monitor limits. 598 */ 599static int uvesafb_is_valid_mode(struct fb_videomode *mode, 600 struct fb_info *info) 601{ 602 if (info->monspecs.gtf) { 603 fb_videomode_to_var(&info->var, mode); 604 if (fb_validate_mode(&info->var, info)) 605 return 0; 606 } 607 608 if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8, 609 UVESAFB_EXACT_RES) == -1) 610 return 0; 611 612 return 1; 613} 614 615static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info) 616{ 617 struct uvesafb_par *par = info->par; 618 int err = 0; 619 620 if (noedid || par->vbe_ib.vbe_version < 0x0300) 621 return -EINVAL; 622 623 task->t.regs.eax = 0x4f15; 624 task->t.regs.ebx = 0; 625 task->t.regs.ecx = 0; 626 task->t.buf_len = 0; 627 task->t.flags = 0; 628 629 err = uvesafb_exec(task); 630 631 if ((task->t.regs.eax & 0xffff) != 0x004f || err) 632 return -EINVAL; 633 634 if ((task->t.regs.ebx & 0x3) == 3) { 635 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n"); 636 } else if ((task->t.regs.ebx & 0x3) == 2) { 637 pr_info("VBIOS/hardware supports DDC2 transfers\n"); 638 } else if ((task->t.regs.ebx & 0x3) == 1) { 639 pr_info("VBIOS/hardware supports DDC1 transfers\n"); 640 } else { 641 pr_info("VBIOS/hardware doesn't support DDC transfers\n"); 642 return -EINVAL; 643 } 644 645 task->t.regs.eax = 0x4f15; 646 task->t.regs.ebx = 1; 647 task->t.regs.ecx = task->t.regs.edx = 0; 648 task->t.flags = TF_BUF_RET | TF_BUF_ESDI; 649 task->t.buf_len = EDID_LENGTH; 650 task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL); 651 if (!task->buf) 652 return -ENOMEM; 653 654 err = uvesafb_exec(task); 655 656 if ((task->t.regs.eax & 0xffff) == 0x004f && !err) { 657 fb_edid_to_monspecs(task->buf, &info->monspecs); 658 659 if (info->monspecs.vfmax && info->monspecs.hfmax) { 660 /* 661 * If the maximum pixel clock wasn't specified in 662 * the EDID block, set it to 300 MHz. 663 */ 664 if (info->monspecs.dclkmax == 0) 665 info->monspecs.dclkmax = 300 * 1000000; 666 info->monspecs.gtf = 1; 667 } 668 } else { 669 err = -EINVAL; 670 } 671 672 kfree(task->buf); 673 return err; 674} 675 676static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task, 677 struct fb_info *info) 678{ 679 struct uvesafb_par *par = info->par; 680 int i; 681 682 memset(&info->monspecs, 0, sizeof(info->monspecs)); 683 684 /* 685 * If we don't get all necessary data from the EDID block, 686 * mark it as incompatible with the GTF and set nocrtc so 687 * that we always use the default BIOS refresh rate. 688 */ 689 if (uvesafb_vbe_getedid(task, info)) { 690 info->monspecs.gtf = 0; 691 par->nocrtc = 1; 692 } 693 694 /* Kernel command line overrides. */ 695 if (maxclk) 696 info->monspecs.dclkmax = maxclk * 1000000; 697 if (maxvf) 698 info->monspecs.vfmax = maxvf; 699 if (maxhf) 700 info->monspecs.hfmax = maxhf * 1000; 701 702 /* 703 * In case DDC transfers are not supported, the user can provide 704 * monitor limits manually. Lower limits are set to "safe" values. 705 */ 706 if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) { 707 info->monspecs.dclkmin = 0; 708 info->monspecs.vfmin = 60; 709 info->monspecs.hfmin = 29000; 710 info->monspecs.gtf = 1; 711 par->nocrtc = 0; 712 } 713 714 if (info->monspecs.gtf) 715 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n", 716 info->monspecs.vfmax, 717 (int)(info->monspecs.hfmax / 1000), 718 (int)(info->monspecs.dclkmax / 1000000)); 719 else 720 pr_info("no monitor limits have been set, default refresh rate will be used\n"); 721 722 /* Add VBE modes to the modelist. */ 723 for (i = 0; i < par->vbe_modes_cnt; i++) { 724 struct fb_var_screeninfo var; 725 struct vbe_mode_ib *mode; 726 struct fb_videomode vmode; 727 728 mode = &par->vbe_modes[i]; 729 memset(&var, 0, sizeof(var)); 730 731 var.xres = mode->x_res; 732 var.yres = mode->y_res; 733 734 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info); 735 fb_var_to_videomode(&vmode, &var); 736 fb_add_videomode(&vmode, &info->modelist); 737 } 738 739 /* Add valid VESA modes to our modelist. */ 740 for (i = 0; i < VESA_MODEDB_SIZE; i++) { 741 if (uvesafb_is_valid_mode((struct fb_videomode *) 742 &vesa_modes[i], info)) 743 fb_add_videomode(&vesa_modes[i], &info->modelist); 744 } 745 746 for (i = 0; i < info->monspecs.modedb_len; i++) { 747 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info)) 748 fb_add_videomode(&info->monspecs.modedb[i], 749 &info->modelist); 750 } 751 752 return; 753} 754 755static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task, 756 struct uvesafb_par *par) 757{ 758 int err; 759 760 uvesafb_reset(task); 761 762 /* 763 * Get the VBE state buffer size. We want all available 764 * hardware state data (CL = 0x0f). 765 */ 766 task->t.regs.eax = 0x4f04; 767 task->t.regs.ecx = 0x000f; 768 task->t.regs.edx = 0x0000; 769 task->t.flags = 0; 770 771 err = uvesafb_exec(task); 772 773 if (err || (task->t.regs.eax & 0xffff) != 0x004f) { 774 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n", 775 task->t.regs.eax, err); 776 par->vbe_state_size = 0; 777 return; 778 } 779 780 par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff); 781} 782 783static int uvesafb_vbe_init(struct fb_info *info) 784{ 785 struct uvesafb_ktask *task = NULL; 786 struct uvesafb_par *par = info->par; 787 int err; 788 789 task = uvesafb_prep(); 790 if (!task) 791 return -ENOMEM; 792 793 err = uvesafb_vbe_getinfo(task, par); 794 if (err) 795 goto out; 796 797 err = uvesafb_vbe_getmodes(task, par); 798 if (err) 799 goto out; 800 801 par->nocrtc = nocrtc; 802#ifdef CONFIG_X86_32 803 par->pmi_setpal = pmi_setpal; 804 par->ypan = ypan; 805 806 if (par->pmi_setpal || par->ypan) { 807 if (__supported_pte_mask & _PAGE_NX) { 808 par->pmi_setpal = par->ypan = 0; 809 pr_warn("NX protection is active, better not use the PMI\n"); 810 } else { 811 uvesafb_vbe_getpmi(task, par); 812 } 813 } 814#else 815 /* The protected mode interface is not available on non-x86. */ 816 par->pmi_setpal = par->ypan = 0; 817#endif 818 819 INIT_LIST_HEAD(&info->modelist); 820 uvesafb_vbe_getmonspecs(task, info); 821 uvesafb_vbe_getstatesize(task, par); 822 823out: uvesafb_free(task); 824 return err; 825} 826 827static int uvesafb_vbe_init_mode(struct fb_info *info) 828{ 829 struct list_head *pos; 830 struct fb_modelist *modelist; 831 struct fb_videomode *mode; 832 struct uvesafb_par *par = info->par; 833 int i, modeid; 834 835 /* Has the user requested a specific VESA mode? */ 836 if (vbemode) { 837 for (i = 0; i < par->vbe_modes_cnt; i++) { 838 if (par->vbe_modes[i].mode_id == vbemode) { 839 modeid = i; 840 uvesafb_setup_var(&info->var, info, 841 &par->vbe_modes[modeid]); 842 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, 843 &info->var, info); 844 /* 845 * With pixclock set to 0, the default BIOS 846 * timings will be used in set_par(). 847 */ 848 info->var.pixclock = 0; 849 goto gotmode; 850 } 851 } 852 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode); 853 vbemode = 0; 854 } 855 856 /* Count the modes in the modelist */ 857 i = 0; 858 list_for_each(pos, &info->modelist) 859 i++; 860 861 /* 862 * Convert the modelist into a modedb so that we can use it with 863 * fb_find_mode(). 864 */ 865 mode = kcalloc(i, sizeof(*mode), GFP_KERNEL); 866 if (mode) { 867 i = 0; 868 list_for_each(pos, &info->modelist) { 869 modelist = list_entry(pos, struct fb_modelist, list); 870 mode[i] = modelist->mode; 871 i++; 872 } 873 874 if (!mode_option) 875 mode_option = UVESAFB_DEFAULT_MODE; 876 877 i = fb_find_mode(&info->var, info, mode_option, mode, i, 878 NULL, 8); 879 880 kfree(mode); 881 } 882 883 /* fb_find_mode() failed */ 884 if (i == 0) { 885 info->var.xres = 640; 886 info->var.yres = 480; 887 mode = (struct fb_videomode *) 888 fb_find_best_mode(&info->var, &info->modelist); 889 890 if (mode) { 891 fb_videomode_to_var(&info->var, mode); 892 } else { 893 modeid = par->vbe_modes[0].mode_id; 894 uvesafb_setup_var(&info->var, info, 895 &par->vbe_modes[modeid]); 896 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, 897 &info->var, info); 898 899 goto gotmode; 900 } 901 } 902 903 /* Look for a matching VBE mode. */ 904 modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, 905 info->var.bits_per_pixel, UVESAFB_EXACT_RES); 906 907 if (modeid == -1) 908 return -EINVAL; 909 910 uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]); 911 912gotmode: 913 /* 914 * If we are not VBE3.0+ compliant, we're done -- the BIOS will 915 * ignore our timings anyway. 916 */ 917 if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc) 918 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, 919 &info->var, info); 920 921 return modeid; 922} 923 924static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count, 925 int start, struct fb_info *info) 926{ 927 struct uvesafb_ktask *task; 928#ifdef CONFIG_X86 929 struct uvesafb_par *par = info->par; 930 int i = par->mode_idx; 931#endif 932 int err = 0; 933 934 /* 935 * We support palette modifications for 8 bpp modes only, so 936 * there can never be more than 256 entries. 937 */ 938 if (start + count > 256) 939 return -EINVAL; 940 941#ifdef CONFIG_X86 942 /* Use VGA registers if mode is VGA-compatible. */ 943 if (i >= 0 && i < par->vbe_modes_cnt && 944 par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) { 945 for (i = 0; i < count; i++) { 946 outb_p(start + i, dac_reg); 947 outb_p(entries[i].red, dac_val); 948 outb_p(entries[i].green, dac_val); 949 outb_p(entries[i].blue, dac_val); 950 } 951 } 952#ifdef CONFIG_X86_32 953 else if (par->pmi_setpal) { 954 __asm__ __volatile__( 955 "call *(%%esi)" 956 : /* no return value */ 957 : "a" (0x4f09), /* EAX */ 958 "b" (0), /* EBX */ 959 "c" (count), /* ECX */ 960 "d" (start), /* EDX */ 961 "D" (entries), /* EDI */ 962 "S" (&par->pmi_pal)); /* ESI */ 963 } 964#endif /* CONFIG_X86_32 */ 965 else 966#endif /* CONFIG_X86 */ 967 { 968 task = uvesafb_prep(); 969 if (!task) 970 return -ENOMEM; 971 972 task->t.regs.eax = 0x4f09; 973 task->t.regs.ebx = 0x0; 974 task->t.regs.ecx = count; 975 task->t.regs.edx = start; 976 task->t.flags = TF_BUF_ESDI; 977 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count; 978 task->buf = entries; 979 980 err = uvesafb_exec(task); 981 if ((task->t.regs.eax & 0xffff) != 0x004f) 982 err = 1; 983 984 uvesafb_free(task); 985 } 986 return err; 987} 988 989static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green, 990 unsigned blue, unsigned transp, 991 struct fb_info *info) 992{ 993 struct uvesafb_pal_entry entry; 994 int shift = 16 - dac_width; 995 int err = 0; 996 997 if (regno >= info->cmap.len) 998 return -EINVAL; 999 1000 if (info->var.bits_per_pixel == 8) { 1001 entry.red = red >> shift; 1002 entry.green = green >> shift; 1003 entry.blue = blue >> shift; 1004 entry.pad = 0; 1005 1006 err = uvesafb_setpalette(&entry, 1, regno, info); 1007 } else if (regno < 16) { 1008 switch (info->var.bits_per_pixel) { 1009 case 16: 1010 if (info->var.red.offset == 10) { 1011 /* 1:5:5:5 */ 1012 ((u32 *) (info->pseudo_palette))[regno] = 1013 ((red & 0xf800) >> 1) | 1014 ((green & 0xf800) >> 6) | 1015 ((blue & 0xf800) >> 11); 1016 } else { 1017 /* 0:5:6:5 */ 1018 ((u32 *) (info->pseudo_palette))[regno] = 1019 ((red & 0xf800) ) | 1020 ((green & 0xfc00) >> 5) | 1021 ((blue & 0xf800) >> 11); 1022 } 1023 break; 1024 1025 case 24: 1026 case 32: 1027 red >>= 8; 1028 green >>= 8; 1029 blue >>= 8; 1030 ((u32 *)(info->pseudo_palette))[regno] = 1031 (red << info->var.red.offset) | 1032 (green << info->var.green.offset) | 1033 (blue << info->var.blue.offset); 1034 break; 1035 } 1036 } 1037 return err; 1038} 1039 1040static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info) 1041{ 1042 struct uvesafb_pal_entry *entries; 1043 int shift = 16 - dac_width; 1044 int i, err = 0; 1045 1046 if (info->var.bits_per_pixel == 8) { 1047 if (cmap->start + cmap->len > info->cmap.start + 1048 info->cmap.len || cmap->start < info->cmap.start) 1049 return -EINVAL; 1050 1051 entries = kmalloc_array(cmap->len, sizeof(*entries), 1052 GFP_KERNEL); 1053 if (!entries) 1054 return -ENOMEM; 1055 1056 for (i = 0; i < cmap->len; i++) { 1057 entries[i].red = cmap->red[i] >> shift; 1058 entries[i].green = cmap->green[i] >> shift; 1059 entries[i].blue = cmap->blue[i] >> shift; 1060 entries[i].pad = 0; 1061 } 1062 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info); 1063 kfree(entries); 1064 } else { 1065 /* 1066 * For modes with bpp > 8, we only set the pseudo palette in 1067 * the fb_info struct. We rely on uvesafb_setcolreg to do all 1068 * sanity checking. 1069 */ 1070 for (i = 0; i < cmap->len; i++) { 1071 err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i], 1072 cmap->green[i], cmap->blue[i], 1073 0, info); 1074 } 1075 } 1076 return err; 1077} 1078 1079static int uvesafb_pan_display(struct fb_var_screeninfo *var, 1080 struct fb_info *info) 1081{ 1082#ifdef CONFIG_X86_32 1083 int offset; 1084 struct uvesafb_par *par = info->par; 1085 1086 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4; 1087 1088 /* 1089 * It turns out it's not the best idea to do panning via vm86, 1090 * so we only allow it if we have a PMI. 1091 */ 1092 if (par->pmi_start) { 1093 __asm__ __volatile__( 1094 "call *(%%edi)" 1095 : /* no return value */ 1096 : "a" (0x4f07), /* EAX */ 1097 "b" (0), /* EBX */ 1098 "c" (offset), /* ECX */ 1099 "d" (offset >> 16), /* EDX */ 1100 "D" (&par->pmi_start)); /* EDI */ 1101 } 1102#endif 1103 return 0; 1104} 1105 1106static int uvesafb_blank(int blank, struct fb_info *info) 1107{ 1108 struct uvesafb_ktask *task; 1109 int err = 1; 1110#ifdef CONFIG_X86 1111 struct uvesafb_par *par = info->par; 1112 1113 if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) { 1114 int loop = 10000; 1115 u8 seq = 0, crtc17 = 0; 1116 1117 if (blank == FB_BLANK_POWERDOWN) { 1118 seq = 0x20; 1119 crtc17 = 0x00; 1120 err = 0; 1121 } else { 1122 seq = 0x00; 1123 crtc17 = 0x80; 1124 err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL; 1125 } 1126 1127 vga_wseq(NULL, 0x00, 0x01); 1128 seq |= vga_rseq(NULL, 0x01) & ~0x20; 1129 vga_wseq(NULL, 0x00, seq); 1130 1131 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80; 1132 while (loop--); 1133 vga_wcrt(NULL, 0x17, crtc17); 1134 vga_wseq(NULL, 0x00, 0x03); 1135 } else 1136#endif /* CONFIG_X86 */ 1137 { 1138 task = uvesafb_prep(); 1139 if (!task) 1140 return -ENOMEM; 1141 1142 task->t.regs.eax = 0x4f10; 1143 switch (blank) { 1144 case FB_BLANK_UNBLANK: 1145 task->t.regs.ebx = 0x0001; 1146 break; 1147 case FB_BLANK_NORMAL: 1148 task->t.regs.ebx = 0x0101; /* standby */ 1149 break; 1150 case FB_BLANK_POWERDOWN: 1151 task->t.regs.ebx = 0x0401; /* powerdown */ 1152 break; 1153 default: 1154 goto out; 1155 } 1156 1157 err = uvesafb_exec(task); 1158 if (err || (task->t.regs.eax & 0xffff) != 0x004f) 1159 err = 1; 1160out: uvesafb_free(task); 1161 } 1162 return err; 1163} 1164 1165static int uvesafb_open(struct fb_info *info, int user) 1166{ 1167 struct uvesafb_par *par = info->par; 1168 int cnt = atomic_read(&par->ref_count); 1169 u8 *buf = NULL; 1170 1171 if (!cnt && par->vbe_state_size) { 1172 buf = uvesafb_vbe_state_save(par); 1173 if (IS_ERR(buf)) { 1174 pr_warn("save hardware state failed, error code is %ld!\n", 1175 PTR_ERR(buf)); 1176 } else { 1177 par->vbe_state_orig = buf; 1178 } 1179 } 1180 1181 atomic_inc(&par->ref_count); 1182 return 0; 1183} 1184 1185static int uvesafb_release(struct fb_info *info, int user) 1186{ 1187 struct uvesafb_ktask *task = NULL; 1188 struct uvesafb_par *par = info->par; 1189 int cnt = atomic_read(&par->ref_count); 1190 1191 if (!cnt) 1192 return -EINVAL; 1193 1194 if (cnt != 1) 1195 goto out; 1196 1197 task = uvesafb_prep(); 1198 if (!task) 1199 goto out; 1200 1201 /* First, try to set the standard 80x25 text mode. */ 1202 task->t.regs.eax = 0x0003; 1203 uvesafb_exec(task); 1204 1205 /* 1206 * Now try to restore whatever hardware state we might have 1207 * saved when the fb device was first opened. 1208 */ 1209 uvesafb_vbe_state_restore(par, par->vbe_state_orig); 1210out: 1211 atomic_dec(&par->ref_count); 1212 uvesafb_free(task); 1213 return 0; 1214} 1215 1216static int uvesafb_set_par(struct fb_info *info) 1217{ 1218 struct uvesafb_par *par = info->par; 1219 struct uvesafb_ktask *task = NULL; 1220 struct vbe_crtc_ib *crtc = NULL; 1221 struct vbe_mode_ib *mode = NULL; 1222 int i, err = 0, depth = info->var.bits_per_pixel; 1223 1224 if (depth > 8 && depth != 32) 1225 depth = info->var.red.length + info->var.green.length + 1226 info->var.blue.length; 1227 1228 i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth, 1229 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH); 1230 if (i >= 0) 1231 mode = &par->vbe_modes[i]; 1232 else 1233 return -EINVAL; 1234 1235 task = uvesafb_prep(); 1236 if (!task) 1237 return -ENOMEM; 1238setmode: 1239 task->t.regs.eax = 0x4f02; 1240 task->t.regs.ebx = mode->mode_id | 0x4000; /* use LFB */ 1241 1242 if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc && 1243 info->var.pixclock != 0) { 1244 task->t.regs.ebx |= 0x0800; /* use CRTC data */ 1245 task->t.flags = TF_BUF_ESDI; 1246 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL); 1247 if (!crtc) { 1248 err = -ENOMEM; 1249 goto out; 1250 } 1251 crtc->horiz_start = info->var.xres + info->var.right_margin; 1252 crtc->horiz_end = crtc->horiz_start + info->var.hsync_len; 1253 crtc->horiz_total = crtc->horiz_end + info->var.left_margin; 1254 1255 crtc->vert_start = info->var.yres + info->var.lower_margin; 1256 crtc->vert_end = crtc->vert_start + info->var.vsync_len; 1257 crtc->vert_total = crtc->vert_end + info->var.upper_margin; 1258 1259 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000; 1260 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock / 1261 (crtc->vert_total * crtc->horiz_total))); 1262 1263 if (info->var.vmode & FB_VMODE_DOUBLE) 1264 crtc->flags |= 0x1; 1265 if (info->var.vmode & FB_VMODE_INTERLACED) 1266 crtc->flags |= 0x2; 1267 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT)) 1268 crtc->flags |= 0x4; 1269 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT)) 1270 crtc->flags |= 0x8; 1271 memcpy(&par->crtc, crtc, sizeof(*crtc)); 1272 } else { 1273 memset(&par->crtc, 0, sizeof(*crtc)); 1274 } 1275 1276 task->t.buf_len = sizeof(struct vbe_crtc_ib); 1277 task->buf = &par->crtc; 1278 1279 err = uvesafb_exec(task); 1280 if (err || (task->t.regs.eax & 0xffff) != 0x004f) { 1281 /* 1282 * The mode switch might have failed because we tried to 1283 * use our own timings. Try again with the default timings. 1284 */ 1285 if (crtc != NULL) { 1286 pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n", 1287 task->t.regs.eax, err); 1288 uvesafb_reset(task); 1289 kfree(crtc); 1290 crtc = NULL; 1291 info->var.pixclock = 0; 1292 goto setmode; 1293 } else { 1294 pr_err("mode switch failed (eax=0x%x, err=%d)\n", 1295 task->t.regs.eax, err); 1296 err = -EINVAL; 1297 goto out; 1298 } 1299 } 1300 par->mode_idx = i; 1301 1302 /* For 8bpp modes, always try to set the DAC to 8 bits. */ 1303 if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC && 1304 mode->bits_per_pixel <= 8) { 1305 uvesafb_reset(task); 1306 task->t.regs.eax = 0x4f08; 1307 task->t.regs.ebx = 0x0800; 1308 1309 err = uvesafb_exec(task); 1310 if (err || (task->t.regs.eax & 0xffff) != 0x004f || 1311 ((task->t.regs.ebx & 0xff00) >> 8) != 8) { 1312 dac_width = 6; 1313 } else { 1314 dac_width = 8; 1315 } 1316 } 1317 1318 info->fix.visual = (info->var.bits_per_pixel == 8) ? 1319 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR; 1320 info->fix.line_length = mode->bytes_per_scan_line; 1321 1322out: 1323 kfree(crtc); 1324 uvesafb_free(task); 1325 1326 return err; 1327} 1328 1329static void uvesafb_check_limits(struct fb_var_screeninfo *var, 1330 struct fb_info *info) 1331{ 1332 const struct fb_videomode *mode; 1333 struct uvesafb_par *par = info->par; 1334 1335 /* 1336 * If pixclock is set to 0, then we're using default BIOS timings 1337 * and thus don't have to perform any checks here. 1338 */ 1339 if (!var->pixclock) 1340 return; 1341 1342 if (par->vbe_ib.vbe_version < 0x0300) { 1343 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info); 1344 return; 1345 } 1346 1347 if (!fb_validate_mode(var, info)) 1348 return; 1349 1350 mode = fb_find_best_mode(var, &info->modelist); 1351 if (mode) { 1352 if (mode->xres == var->xres && mode->yres == var->yres && 1353 !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) { 1354 fb_videomode_to_var(var, mode); 1355 return; 1356 } 1357 } 1358 1359 if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info)) 1360 return; 1361 /* Use default refresh rate */ 1362 var->pixclock = 0; 1363} 1364 1365static int uvesafb_check_var(struct fb_var_screeninfo *var, 1366 struct fb_info *info) 1367{ 1368 struct uvesafb_par *par = info->par; 1369 struct vbe_mode_ib *mode = NULL; 1370 int match = -1; 1371 int depth = var->red.length + var->green.length + var->blue.length; 1372 1373 /* 1374 * Various apps will use bits_per_pixel to set the color depth, 1375 * which is theoretically incorrect, but which we'll try to handle 1376 * here. 1377 */ 1378 if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8) 1379 depth = var->bits_per_pixel; 1380 1381 match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth, 1382 UVESAFB_EXACT_RES); 1383 if (match == -1) 1384 return -EINVAL; 1385 1386 mode = &par->vbe_modes[match]; 1387 uvesafb_setup_var(var, info, mode); 1388 1389 /* 1390 * Check whether we have remapped enough memory for this mode. 1391 * We might be called at an early stage, when we haven't remapped 1392 * any memory yet, in which case we simply skip the check. 1393 */ 1394 if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len 1395 && info->fix.smem_len) 1396 return -EINVAL; 1397 1398 if ((var->vmode & FB_VMODE_DOUBLE) && 1399 !(par->vbe_modes[match].mode_attr & 0x100)) 1400 var->vmode &= ~FB_VMODE_DOUBLE; 1401 1402 if ((var->vmode & FB_VMODE_INTERLACED) && 1403 !(par->vbe_modes[match].mode_attr & 0x200)) 1404 var->vmode &= ~FB_VMODE_INTERLACED; 1405 1406 uvesafb_check_limits(var, info); 1407 1408 var->xres_virtual = var->xres; 1409 var->yres_virtual = (par->ypan) ? 1410 info->fix.smem_len / mode->bytes_per_scan_line : 1411 var->yres; 1412 return 0; 1413} 1414 1415static struct fb_ops uvesafb_ops = { 1416 .owner = THIS_MODULE, 1417 .fb_open = uvesafb_open, 1418 .fb_release = uvesafb_release, 1419 FB_DEFAULT_IOMEM_OPS, 1420 .fb_setcolreg = uvesafb_setcolreg, 1421 .fb_setcmap = uvesafb_setcmap, 1422 .fb_pan_display = uvesafb_pan_display, 1423 .fb_blank = uvesafb_blank, 1424 .fb_check_var = uvesafb_check_var, 1425 .fb_set_par = uvesafb_set_par, 1426}; 1427 1428static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode) 1429{ 1430 unsigned int size_vmode; 1431 unsigned int size_remap; 1432 unsigned int size_total; 1433 struct uvesafb_par *par = info->par; 1434 int i, h; 1435 1436 info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par)); 1437 info->fix = uvesafb_fix; 1438 info->fix.ypanstep = par->ypan ? 1 : 0; 1439 info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0; 1440 1441 /* Disable blanking if the user requested so. */ 1442 if (!blank) 1443 uvesafb_ops.fb_blank = NULL; 1444 1445 /* 1446 * Find out how much IO memory is required for the mode with 1447 * the highest resolution. 1448 */ 1449 size_remap = 0; 1450 for (i = 0; i < par->vbe_modes_cnt; i++) { 1451 h = par->vbe_modes[i].bytes_per_scan_line * 1452 par->vbe_modes[i].y_res; 1453 if (h > size_remap) 1454 size_remap = h; 1455 } 1456 size_remap *= 2; 1457 1458 /* 1459 * size_vmode -- that is the amount of memory needed for the 1460 * used video mode, i.e. the minimum amount of 1461 * memory we need. 1462 */ 1463 size_vmode = info->var.yres * mode->bytes_per_scan_line; 1464 1465 /* 1466 * size_total -- all video memory we have. Used for mtrr 1467 * entries, resource allocation and bounds 1468 * checking. 1469 */ 1470 size_total = par->vbe_ib.total_memory * 65536; 1471 if (vram_total) 1472 size_total = vram_total * 1024 * 1024; 1473 if (size_total < size_vmode) 1474 size_total = size_vmode; 1475 1476 /* 1477 * size_remap -- the amount of video memory we are going to 1478 * use for vesafb. With modern cards it is no 1479 * option to simply use size_total as th 1480 * wastes plenty of kernel address space. 1481 */ 1482 if (vram_remap) 1483 size_remap = vram_remap * 1024 * 1024; 1484 if (size_remap < size_vmode) 1485 size_remap = size_vmode; 1486 if (size_remap > size_total) 1487 size_remap = size_total; 1488 1489 info->fix.smem_len = size_remap; 1490 info->fix.smem_start = mode->phys_base_ptr; 1491 1492 /* 1493 * We have to set yres_virtual here because when setup_var() was 1494 * called, smem_len wasn't defined yet. 1495 */ 1496 info->var.yres_virtual = info->fix.smem_len / 1497 mode->bytes_per_scan_line; 1498 1499 if (par->ypan && info->var.yres_virtual > info->var.yres) { 1500 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n", 1501 (par->ypan > 1) ? "ywrap" : "ypan", 1502 info->var.yres_virtual); 1503 } else { 1504 pr_info("scrolling: redraw\n"); 1505 info->var.yres_virtual = info->var.yres; 1506 par->ypan = 0; 1507 } 1508 1509 info->flags = (par->ypan ? FBINFO_HWACCEL_YPAN : 0); 1510 1511 if (!par->ypan) 1512 uvesafb_ops.fb_pan_display = NULL; 1513} 1514 1515static void uvesafb_init_mtrr(struct fb_info *info) 1516{ 1517 struct uvesafb_par *par = info->par; 1518 1519 if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) { 1520 int temp_size = info->fix.smem_len; 1521 1522 int rc; 1523 1524 /* Find the largest power-of-two */ 1525 temp_size = roundup_pow_of_two(temp_size); 1526 1527 /* Try and find a power of two to add */ 1528 do { 1529 rc = arch_phys_wc_add(info->fix.smem_start, temp_size); 1530 temp_size >>= 1; 1531 } while (temp_size >= PAGE_SIZE && rc == -EINVAL); 1532 1533 if (rc >= 0) 1534 par->mtrr_handle = rc; 1535 } 1536} 1537 1538static void uvesafb_ioremap(struct fb_info *info) 1539{ 1540 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len); 1541} 1542 1543static ssize_t uvesafb_show_vbe_ver(struct device *dev, 1544 struct device_attribute *attr, char *buf) 1545{ 1546 struct fb_info *info = dev_get_drvdata(dev); 1547 struct uvesafb_par *par = info->par; 1548 1549 return sysfs_emit(buf, "%.4x\n", par->vbe_ib.vbe_version); 1550} 1551 1552static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL); 1553 1554static ssize_t uvesafb_show_vbe_modes(struct device *dev, 1555 struct device_attribute *attr, char *buf) 1556{ 1557 struct fb_info *info = dev_get_drvdata(dev); 1558 struct uvesafb_par *par = info->par; 1559 int ret = 0, i; 1560 1561 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) { 1562 ret += scnprintf(buf + ret, PAGE_SIZE - ret, 1563 "%dx%d-%d, 0x%.4x\n", 1564 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res, 1565 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id); 1566 } 1567 1568 return ret; 1569} 1570 1571static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL); 1572 1573static ssize_t uvesafb_show_vendor(struct device *dev, 1574 struct device_attribute *attr, char *buf) 1575{ 1576 struct fb_info *info = dev_get_drvdata(dev); 1577 struct uvesafb_par *par = info->par; 1578 1579 if (par->vbe_ib.oem_vendor_name_ptr) 1580 return sysfs_emit(buf, "%s\n", (char *) 1581 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr); 1582 else 1583 return 0; 1584} 1585 1586static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL); 1587 1588static ssize_t uvesafb_show_product_name(struct device *dev, 1589 struct device_attribute *attr, char *buf) 1590{ 1591 struct fb_info *info = dev_get_drvdata(dev); 1592 struct uvesafb_par *par = info->par; 1593 1594 if (par->vbe_ib.oem_product_name_ptr) 1595 return sysfs_emit(buf, "%s\n", (char *) 1596 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr); 1597 else 1598 return 0; 1599} 1600 1601static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL); 1602 1603static ssize_t uvesafb_show_product_rev(struct device *dev, 1604 struct device_attribute *attr, char *buf) 1605{ 1606 struct fb_info *info = dev_get_drvdata(dev); 1607 struct uvesafb_par *par = info->par; 1608 1609 if (par->vbe_ib.oem_product_rev_ptr) 1610 return sysfs_emit(buf, "%s\n", (char *) 1611 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr); 1612 else 1613 return 0; 1614} 1615 1616static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL); 1617 1618static ssize_t uvesafb_show_oem_string(struct device *dev, 1619 struct device_attribute *attr, char *buf) 1620{ 1621 struct fb_info *info = dev_get_drvdata(dev); 1622 struct uvesafb_par *par = info->par; 1623 1624 if (par->vbe_ib.oem_string_ptr) 1625 return sysfs_emit(buf, "%s\n", 1626 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr); 1627 else 1628 return 0; 1629} 1630 1631static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL); 1632 1633static ssize_t uvesafb_show_nocrtc(struct device *dev, 1634 struct device_attribute *attr, char *buf) 1635{ 1636 struct fb_info *info = dev_get_drvdata(dev); 1637 struct uvesafb_par *par = info->par; 1638 1639 return sysfs_emit(buf, "%d\n", par->nocrtc); 1640} 1641 1642static ssize_t uvesafb_store_nocrtc(struct device *dev, 1643 struct device_attribute *attr, const char *buf, size_t count) 1644{ 1645 struct fb_info *info = dev_get_drvdata(dev); 1646 struct uvesafb_par *par = info->par; 1647 1648 if (count > 0) { 1649 if (buf[0] == '0') 1650 par->nocrtc = 0; 1651 else 1652 par->nocrtc = 1; 1653 } 1654 return count; 1655} 1656 1657static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc, 1658 uvesafb_store_nocrtc); 1659 1660static struct attribute *uvesafb_dev_attrs[] = { 1661 &dev_attr_vbe_version.attr, 1662 &dev_attr_vbe_modes.attr, 1663 &dev_attr_oem_vendor.attr, 1664 &dev_attr_oem_product_name.attr, 1665 &dev_attr_oem_product_rev.attr, 1666 &dev_attr_oem_string.attr, 1667 &dev_attr_nocrtc.attr, 1668 NULL, 1669}; 1670 1671static const struct attribute_group uvesafb_dev_attgrp = { 1672 .name = NULL, 1673 .attrs = uvesafb_dev_attrs, 1674}; 1675 1676static int uvesafb_probe(struct platform_device *dev) 1677{ 1678 struct fb_info *info; 1679 struct vbe_mode_ib *mode = NULL; 1680 struct uvesafb_par *par; 1681 int err = 0, i; 1682 1683 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev); 1684 if (!info) 1685 return -ENOMEM; 1686 1687 par = info->par; 1688 1689 err = uvesafb_vbe_init(info); 1690 if (err) { 1691 pr_err("vbe_init() failed with %d\n", err); 1692 goto out; 1693 } 1694 1695 info->fbops = &uvesafb_ops; 1696 1697 i = uvesafb_vbe_init_mode(info); 1698 if (i < 0) { 1699 err = -EINVAL; 1700 goto out; 1701 } else { 1702 mode = &par->vbe_modes[i]; 1703 } 1704 1705 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { 1706 err = -ENXIO; 1707 goto out; 1708 } 1709 1710 uvesafb_init_info(info, mode); 1711 1712 if (!request_region(0x3c0, 32, "uvesafb")) { 1713 pr_err("request region 0x3c0-0x3e0 failed\n"); 1714 err = -EIO; 1715 goto out_mode; 1716 } 1717 1718 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len, 1719 "uvesafb")) { 1720 pr_err("cannot reserve video memory at 0x%lx\n", 1721 info->fix.smem_start); 1722 err = -EIO; 1723 goto out_reg; 1724 } 1725 1726 uvesafb_init_mtrr(info); 1727 uvesafb_ioremap(info); 1728 1729 if (!info->screen_base) { 1730 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n", 1731 info->fix.smem_len, info->fix.smem_start); 1732 err = -EIO; 1733 goto out_mem; 1734 } 1735 1736 platform_set_drvdata(dev, info); 1737 1738 if (register_framebuffer(info) < 0) { 1739 pr_err("failed to register framebuffer device\n"); 1740 err = -EINVAL; 1741 goto out_unmap; 1742 } 1743 1744 pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n", 1745 info->fix.smem_start, info->screen_base, 1746 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64); 1747 fb_info(info, "%s frame buffer device\n", info->fix.id); 1748 1749 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp); 1750 if (err != 0) 1751 fb_warn(info, "failed to register attributes\n"); 1752 1753 return 0; 1754 1755out_unmap: 1756 iounmap(info->screen_base); 1757out_mem: 1758 arch_phys_wc_del(par->mtrr_handle); 1759 release_mem_region(info->fix.smem_start, info->fix.smem_len); 1760out_reg: 1761 release_region(0x3c0, 32); 1762out_mode: 1763 if (!list_empty(&info->modelist)) 1764 fb_destroy_modelist(&info->modelist); 1765 fb_destroy_modedb(info->monspecs.modedb); 1766 fb_dealloc_cmap(&info->cmap); 1767out: 1768 kfree(par->vbe_modes); 1769 1770 framebuffer_release(info); 1771 return err; 1772} 1773 1774static void uvesafb_remove(struct platform_device *dev) 1775{ 1776 struct fb_info *info = platform_get_drvdata(dev); 1777 struct uvesafb_par *par = info->par; 1778 1779 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp); 1780 unregister_framebuffer(info); 1781 release_region(0x3c0, 32); 1782 iounmap(info->screen_base); 1783 arch_phys_wc_del(par->mtrr_handle); 1784 release_mem_region(info->fix.smem_start, info->fix.smem_len); 1785 fb_destroy_modedb(info->monspecs.modedb); 1786 fb_dealloc_cmap(&info->cmap); 1787 1788 kfree(par->vbe_modes); 1789 kfree(par->vbe_state_orig); 1790 kfree(par->vbe_state_saved); 1791 1792 framebuffer_release(info); 1793} 1794 1795static struct platform_driver uvesafb_driver = { 1796 .probe = uvesafb_probe, 1797 .remove_new = uvesafb_remove, 1798 .driver = { 1799 .name = "uvesafb", 1800 }, 1801}; 1802 1803static struct platform_device *uvesafb_device; 1804 1805#ifndef MODULE 1806static int uvesafb_setup(char *options) 1807{ 1808 char *this_opt; 1809 1810 if (!options || !*options) 1811 return 0; 1812 1813 while ((this_opt = strsep(&options, ",")) != NULL) { 1814 if (!*this_opt) continue; 1815 1816 if (!strcmp(this_opt, "redraw")) 1817 ypan = 0; 1818 else if (!strcmp(this_opt, "ypan")) 1819 ypan = 1; 1820 else if (!strcmp(this_opt, "ywrap")) 1821 ypan = 2; 1822 else if (!strcmp(this_opt, "vgapal")) 1823 pmi_setpal = false; 1824 else if (!strcmp(this_opt, "pmipal")) 1825 pmi_setpal = true; 1826 else if (!strncmp(this_opt, "mtrr:", 5)) 1827 mtrr = simple_strtoul(this_opt+5, NULL, 0); 1828 else if (!strcmp(this_opt, "nomtrr")) 1829 mtrr = 0; 1830 else if (!strcmp(this_opt, "nocrtc")) 1831 nocrtc = true; 1832 else if (!strcmp(this_opt, "noedid")) 1833 noedid = true; 1834 else if (!strcmp(this_opt, "noblank")) 1835 blank = false; 1836 else if (!strncmp(this_opt, "vtotal:", 7)) 1837 vram_total = simple_strtoul(this_opt + 7, NULL, 0); 1838 else if (!strncmp(this_opt, "vremap:", 7)) 1839 vram_remap = simple_strtoul(this_opt + 7, NULL, 0); 1840 else if (!strncmp(this_opt, "maxhf:", 6)) 1841 maxhf = simple_strtoul(this_opt + 6, NULL, 0); 1842 else if (!strncmp(this_opt, "maxvf:", 6)) 1843 maxvf = simple_strtoul(this_opt + 6, NULL, 0); 1844 else if (!strncmp(this_opt, "maxclk:", 7)) 1845 maxclk = simple_strtoul(this_opt + 7, NULL, 0); 1846 else if (!strncmp(this_opt, "vbemode:", 8)) 1847 vbemode = simple_strtoul(this_opt + 8, NULL, 0); 1848 else if (this_opt[0] >= '0' && this_opt[0] <= '9') { 1849 mode_option = this_opt; 1850 } else { 1851 pr_warn("unrecognized option %s\n", this_opt); 1852 } 1853 } 1854 1855 if (mtrr != 3 && mtrr != 0) 1856 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr); 1857 1858 return 0; 1859} 1860#endif /* !MODULE */ 1861 1862static ssize_t v86d_show(struct device_driver *dev, char *buf) 1863{ 1864 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path); 1865} 1866 1867static ssize_t v86d_store(struct device_driver *dev, const char *buf, 1868 size_t count) 1869{ 1870 strncpy(v86d_path, buf, PATH_MAX - 1); 1871 return count; 1872} 1873static DRIVER_ATTR_RW(v86d); 1874 1875static int uvesafb_init(void) 1876{ 1877 int err; 1878 1879#ifndef MODULE 1880 char *option = NULL; 1881 1882 if (fb_get_options("uvesafb", &option)) 1883 return -ENODEV; 1884 uvesafb_setup(option); 1885#endif 1886 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback); 1887 if (err) 1888 return err; 1889 1890 err = platform_driver_register(&uvesafb_driver); 1891 1892 if (!err) { 1893 uvesafb_device = platform_device_alloc("uvesafb", 0); 1894 if (uvesafb_device) 1895 err = platform_device_add(uvesafb_device); 1896 else 1897 err = -ENOMEM; 1898 1899 if (err) { 1900 platform_device_put(uvesafb_device); 1901 platform_driver_unregister(&uvesafb_driver); 1902 cn_del_callback(&uvesafb_cn_id); 1903 return err; 1904 } 1905 1906 err = driver_create_file(&uvesafb_driver.driver, 1907 &driver_attr_v86d); 1908 if (err) { 1909 pr_warn("failed to register attributes\n"); 1910 err = 0; 1911 } 1912 } 1913 return err; 1914} 1915 1916module_init(uvesafb_init); 1917 1918static void uvesafb_exit(void) 1919{ 1920 struct uvesafb_ktask *task; 1921 1922 if (v86d_started) { 1923 task = uvesafb_prep(); 1924 if (task) { 1925 task->t.flags = TF_EXIT; 1926 uvesafb_exec(task); 1927 uvesafb_free(task); 1928 } 1929 } 1930 1931 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d); 1932 platform_device_unregister(uvesafb_device); 1933 platform_driver_unregister(&uvesafb_driver); 1934 cn_del_callback(&uvesafb_cn_id); 1935} 1936 1937module_exit(uvesafb_exit); 1938 1939static int param_set_scroll(const char *val, const struct kernel_param *kp) 1940{ 1941 ypan = 0; 1942 1943 if (!strcmp(val, "redraw")) 1944 ypan = 0; 1945 else if (!strcmp(val, "ypan")) 1946 ypan = 1; 1947 else if (!strcmp(val, "ywrap")) 1948 ypan = 2; 1949 else 1950 return -EINVAL; 1951 1952 return 0; 1953} 1954static const struct kernel_param_ops param_ops_scroll = { 1955 .set = param_set_scroll, 1956}; 1957#define param_check_scroll(name, p) __param_check(name, p, void) 1958 1959module_param_named(scroll, ypan, scroll, 0); 1960MODULE_PARM_DESC(scroll, 1961 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'"); 1962module_param_named(vgapal, pmi_setpal, invbool, 0); 1963MODULE_PARM_DESC(vgapal, "Set palette using VGA registers"); 1964module_param_named(pmipal, pmi_setpal, bool, 0); 1965MODULE_PARM_DESC(pmipal, "Set palette using PMI calls"); 1966module_param(mtrr, uint, 0); 1967MODULE_PARM_DESC(mtrr, 1968 "Memory Type Range Registers setting. Use 0 to disable."); 1969module_param(blank, bool, 0); 1970MODULE_PARM_DESC(blank, "Enable hardware blanking"); 1971module_param(nocrtc, bool, 0); 1972MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes"); 1973module_param(noedid, bool, 0); 1974MODULE_PARM_DESC(noedid, 1975 "Ignore EDID-provided monitor limits when setting modes"); 1976module_param(vram_remap, uint, 0); 1977MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]"); 1978module_param(vram_total, uint, 0); 1979MODULE_PARM_DESC(vram_total, "Set total amount of video memory [MiB]"); 1980module_param(maxclk, ushort, 0); 1981MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data"); 1982module_param(maxhf, ushort, 0); 1983MODULE_PARM_DESC(maxhf, 1984 "Maximum horizontal frequency [kHz], overrides EDID data"); 1985module_param(maxvf, ushort, 0); 1986MODULE_PARM_DESC(maxvf, 1987 "Maximum vertical frequency [Hz], overrides EDID data"); 1988module_param(mode_option, charp, 0); 1989MODULE_PARM_DESC(mode_option, 1990 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\""); 1991module_param(vbemode, ushort, 0); 1992MODULE_PARM_DESC(vbemode, 1993 "VBE mode number to set, overrides the 'mode' option"); 1994module_param_string(v86d, v86d_path, PATH_MAX, 0660); 1995MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper."); 1996 1997MODULE_LICENSE("GPL"); 1998MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>"); 1999MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards"); 2000 2001