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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 <[email protected]>
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_obj(*task);
262 if (task) {
263 task->done = kzalloc_obj(*task->done);
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 = kzalloc_objs(struct vbe_mode_ib, par->vbe_modes_cnt);
491 if (!par->vbe_modes)
492 return -ENOMEM;
493
494 /* Get info about all available modes. */
495 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
496 while (*mode != 0xffff) {
497 struct vbe_mode_ib *mib;
498
499 uvesafb_reset(task);
500 task->t.regs.eax = 0x4f01;
501 task->t.regs.ecx = (u32) *mode;
502 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
503 task->t.buf_len = sizeof(struct vbe_mode_ib);
504 task->buf = par->vbe_modes + off;
505
506 err = uvesafb_exec(task);
507 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
508 pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
509 *mode, (u32)task->t.regs.eax, err);
510 mode++;
511 par->vbe_modes_cnt--;
512 continue;
513 }
514
515 mib = task->buf;
516 mib->mode_id = *mode;
517
518 /*
519 * We only want modes that are supported with the current
520 * hardware configuration, color, graphics and that have
521 * support for the LFB.
522 */
523 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
524 mib->bits_per_pixel >= 8)
525 off++;
526 else
527 par->vbe_modes_cnt--;
528
529 mode++;
530 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
531
532 /*
533 * Handle 8bpp modes and modes with broken color component
534 * lengths.
535 */
536 if (mib->depth == 0 || (mib->depth == 24 &&
537 mib->bits_per_pixel == 32))
538 mib->depth = mib->bits_per_pixel;
539 }
540
541 if (par->vbe_modes_cnt > 0)
542 return 0;
543 else
544 return -EINVAL;
545}
546
547/*
548 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
549 * x86 and not x86_64.
550 */
551#ifdef CONFIG_X86_32
552static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
553 struct uvesafb_par *par)
554{
555 int i, err;
556
557 uvesafb_reset(task);
558 task->t.regs.eax = 0x4f0a;
559 task->t.regs.ebx = 0x0;
560 err = uvesafb_exec(task);
561 if (err)
562 return err;
563
564 if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
565 par->pmi_setpal = par->ypan = 0;
566 } else {
567 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
568 + task->t.regs.edi);
569 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
570 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
571 pr_info("protected mode interface info at %04x:%04x\n",
572 (u16)task->t.regs.es, (u16)task->t.regs.edi);
573 pr_info("pmi: set display start = %p, set palette = %p\n",
574 par->pmi_start, par->pmi_pal);
575
576 if (par->pmi_base[3]) {
577 pr_info("pmi: ports =");
578 for (i = par->pmi_base[3]/2;
579 par->pmi_base[i] != 0xffff; i++)
580 pr_cont(" %x", par->pmi_base[i]);
581 pr_cont("\n");
582
583 if (par->pmi_base[i] != 0xffff) {
584 pr_info("can't handle memory requests, pmi disabled\n");
585 par->ypan = par->pmi_setpal = 0;
586 }
587 }
588 }
589 return 0;
590}
591#endif /* CONFIG_X86_32 */
592
593/*
594 * Check whether a video mode is supported by the Video BIOS and is
595 * compatible with the monitor limits.
596 */
597static int uvesafb_is_valid_mode(struct fb_videomode *mode,
598 struct fb_info *info)
599{
600 if (info->monspecs.gtf) {
601 fb_videomode_to_var(&info->var, mode);
602 if (fb_validate_mode(&info->var, info))
603 return 0;
604 }
605
606 if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
607 UVESAFB_EXACT_RES) == -1)
608 return 0;
609
610 return 1;
611}
612
613static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
614{
615 struct uvesafb_par *par = info->par;
616 int err = 0;
617
618 if (noedid || par->vbe_ib.vbe_version < 0x0300)
619 return -EINVAL;
620
621 task->t.regs.eax = 0x4f15;
622 task->t.regs.ebx = 0;
623 task->t.regs.ecx = 0;
624 task->t.buf_len = 0;
625 task->t.flags = 0;
626
627 err = uvesafb_exec(task);
628
629 if ((task->t.regs.eax & 0xffff) != 0x004f || err)
630 return -EINVAL;
631
632 if ((task->t.regs.ebx & 0x3) == 3) {
633 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
634 } else if ((task->t.regs.ebx & 0x3) == 2) {
635 pr_info("VBIOS/hardware supports DDC2 transfers\n");
636 } else if ((task->t.regs.ebx & 0x3) == 1) {
637 pr_info("VBIOS/hardware supports DDC1 transfers\n");
638 } else {
639 pr_info("VBIOS/hardware doesn't support DDC transfers\n");
640 return -EINVAL;
641 }
642
643 task->t.regs.eax = 0x4f15;
644 task->t.regs.ebx = 1;
645 task->t.regs.ecx = task->t.regs.edx = 0;
646 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
647 task->t.buf_len = EDID_LENGTH;
648 task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
649 if (!task->buf)
650 return -ENOMEM;
651
652 err = uvesafb_exec(task);
653
654 if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
655 fb_edid_to_monspecs(task->buf, &info->monspecs);
656
657 if (info->monspecs.vfmax && info->monspecs.hfmax) {
658 /*
659 * If the maximum pixel clock wasn't specified in
660 * the EDID block, set it to 300 MHz.
661 */
662 if (info->monspecs.dclkmax == 0)
663 info->monspecs.dclkmax = 300 * 1000000;
664 info->monspecs.gtf = 1;
665 }
666 } else {
667 err = -EINVAL;
668 }
669
670 kfree(task->buf);
671 return err;
672}
673
674static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
675 struct fb_info *info)
676{
677 struct uvesafb_par *par = info->par;
678 int i;
679
680 memset(&info->monspecs, 0, sizeof(info->monspecs));
681
682 /*
683 * If we don't get all necessary data from the EDID block,
684 * mark it as incompatible with the GTF and set nocrtc so
685 * that we always use the default BIOS refresh rate.
686 */
687 if (uvesafb_vbe_getedid(task, info)) {
688 info->monspecs.gtf = 0;
689 par->nocrtc = 1;
690 }
691
692 /* Kernel command line overrides. */
693 if (maxclk)
694 info->monspecs.dclkmax = maxclk * 1000000;
695 if (maxvf)
696 info->monspecs.vfmax = maxvf;
697 if (maxhf)
698 info->monspecs.hfmax = maxhf * 1000;
699
700 /*
701 * In case DDC transfers are not supported, the user can provide
702 * monitor limits manually. Lower limits are set to "safe" values.
703 */
704 if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
705 info->monspecs.dclkmin = 0;
706 info->monspecs.vfmin = 60;
707 info->monspecs.hfmin = 29000;
708 info->monspecs.gtf = 1;
709 par->nocrtc = 0;
710 }
711
712 if (info->monspecs.gtf)
713 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n",
714 info->monspecs.vfmax,
715 (int)(info->monspecs.hfmax / 1000),
716 (int)(info->monspecs.dclkmax / 1000000));
717 else
718 pr_info("no monitor limits have been set, default refresh rate will be used\n");
719
720 /* Add VBE modes to the modelist. */
721 for (i = 0; i < par->vbe_modes_cnt; i++) {
722 struct fb_var_screeninfo var;
723 struct vbe_mode_ib *mode;
724 struct fb_videomode vmode;
725
726 mode = &par->vbe_modes[i];
727 memset(&var, 0, sizeof(var));
728
729 var.xres = mode->x_res;
730 var.yres = mode->y_res;
731
732 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
733 fb_var_to_videomode(&vmode, &var);
734 fb_add_videomode(&vmode, &info->modelist);
735 }
736
737 /* Add valid VESA modes to our modelist. */
738 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
739 if (uvesafb_is_valid_mode((struct fb_videomode *)
740 &vesa_modes[i], info))
741 fb_add_videomode(&vesa_modes[i], &info->modelist);
742 }
743
744 for (i = 0; i < info->monspecs.modedb_len; i++) {
745 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
746 fb_add_videomode(&info->monspecs.modedb[i],
747 &info->modelist);
748 }
749
750 return;
751}
752
753static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
754 struct uvesafb_par *par)
755{
756 int err;
757
758 uvesafb_reset(task);
759
760 /*
761 * Get the VBE state buffer size. We want all available
762 * hardware state data (CL = 0x0f).
763 */
764 task->t.regs.eax = 0x4f04;
765 task->t.regs.ecx = 0x000f;
766 task->t.regs.edx = 0x0000;
767 task->t.flags = 0;
768
769 err = uvesafb_exec(task);
770
771 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
772 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n",
773 task->t.regs.eax, err);
774 par->vbe_state_size = 0;
775 return;
776 }
777
778 par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
779}
780
781static int uvesafb_vbe_init(struct fb_info *info)
782{
783 struct uvesafb_ktask *task = NULL;
784 struct uvesafb_par *par = info->par;
785 int err;
786
787 task = uvesafb_prep();
788 if (!task)
789 return -ENOMEM;
790
791 err = uvesafb_vbe_getinfo(task, par);
792 if (err)
793 goto out;
794
795 err = uvesafb_vbe_getmodes(task, par);
796 if (err)
797 goto out;
798
799 par->nocrtc = nocrtc;
800#ifdef CONFIG_X86_32
801 par->pmi_setpal = pmi_setpal;
802 par->ypan = ypan;
803
804 if (par->pmi_setpal || par->ypan) {
805 if (__supported_pte_mask & _PAGE_NX) {
806 par->pmi_setpal = par->ypan = 0;
807 pr_warn("NX protection is active, better not use the PMI\n");
808 } else {
809 uvesafb_vbe_getpmi(task, par);
810 }
811 }
812#else
813 /* The protected mode interface is not available on non-x86. */
814 par->pmi_setpal = par->ypan = 0;
815#endif
816
817 INIT_LIST_HEAD(&info->modelist);
818 uvesafb_vbe_getmonspecs(task, info);
819 uvesafb_vbe_getstatesize(task, par);
820
821out: uvesafb_free(task);
822 return err;
823}
824
825static int uvesafb_vbe_init_mode(struct fb_info *info)
826{
827 struct list_head *pos;
828 struct fb_modelist *modelist;
829 struct fb_videomode *mode;
830 struct uvesafb_par *par = info->par;
831 int i, modeid;
832
833 /* Has the user requested a specific VESA mode? */
834 if (vbemode) {
835 for (i = 0; i < par->vbe_modes_cnt; i++) {
836 if (par->vbe_modes[i].mode_id == vbemode) {
837 modeid = i;
838 uvesafb_setup_var(&info->var, info,
839 &par->vbe_modes[modeid]);
840 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
841 &info->var, info);
842 /*
843 * With pixclock set to 0, the default BIOS
844 * timings will be used in set_par().
845 */
846 info->var.pixclock = 0;
847 goto gotmode;
848 }
849 }
850 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode);
851 vbemode = 0;
852 }
853
854 /* Count the modes in the modelist */
855 i = 0;
856 list_for_each(pos, &info->modelist)
857 i++;
858
859 /*
860 * Convert the modelist into a modedb so that we can use it with
861 * fb_find_mode().
862 */
863 mode = kzalloc_objs(*mode, i);
864 if (mode) {
865 i = 0;
866 list_for_each(pos, &info->modelist) {
867 modelist = list_entry(pos, struct fb_modelist, list);
868 mode[i] = modelist->mode;
869 i++;
870 }
871
872 if (!mode_option)
873 mode_option = UVESAFB_DEFAULT_MODE;
874
875 i = fb_find_mode(&info->var, info, mode_option, mode, i,
876 NULL, 8);
877
878 kfree(mode);
879 }
880
881 /* fb_find_mode() failed */
882 if (i == 0) {
883 info->var.xres = 640;
884 info->var.yres = 480;
885 mode = (struct fb_videomode *)
886 fb_find_best_mode(&info->var, &info->modelist);
887
888 if (mode) {
889 fb_videomode_to_var(&info->var, mode);
890 } else {
891 modeid = par->vbe_modes[0].mode_id;
892 uvesafb_setup_var(&info->var, info,
893 &par->vbe_modes[modeid]);
894 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
895 &info->var, info);
896
897 goto gotmode;
898 }
899 }
900
901 /* Look for a matching VBE mode. */
902 modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
903 info->var.bits_per_pixel, UVESAFB_EXACT_RES);
904
905 if (modeid == -1)
906 return -EINVAL;
907
908 uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
909
910gotmode:
911 /*
912 * If we are not VBE3.0+ compliant, we're done -- the BIOS will
913 * ignore our timings anyway.
914 */
915 if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
916 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
917 &info->var, info);
918
919 return modeid;
920}
921
922static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
923 int start, struct fb_info *info)
924{
925 struct uvesafb_ktask *task;
926#ifdef CONFIG_X86
927 struct uvesafb_par *par = info->par;
928 int i = par->mode_idx;
929#endif
930 int err = 0;
931
932 /*
933 * We support palette modifications for 8 bpp modes only, so
934 * there can never be more than 256 entries.
935 */
936 if (start + count > 256)
937 return -EINVAL;
938
939#ifdef CONFIG_X86
940 /* Use VGA registers if mode is VGA-compatible. */
941 if (i >= 0 && i < par->vbe_modes_cnt &&
942 par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
943 for (i = 0; i < count; i++) {
944 outb_p(start + i, dac_reg);
945 outb_p(entries[i].red, dac_val);
946 outb_p(entries[i].green, dac_val);
947 outb_p(entries[i].blue, dac_val);
948 }
949 }
950#ifdef CONFIG_X86_32
951 else if (par->pmi_setpal) {
952 __asm__ __volatile__(
953 "call *(%%esi)"
954 : /* no return value */
955 : "a" (0x4f09), /* EAX */
956 "b" (0), /* EBX */
957 "c" (count), /* ECX */
958 "d" (start), /* EDX */
959 "D" (entries), /* EDI */
960 "S" (&par->pmi_pal)); /* ESI */
961 }
962#endif /* CONFIG_X86_32 */
963 else
964#endif /* CONFIG_X86 */
965 {
966 task = uvesafb_prep();
967 if (!task)
968 return -ENOMEM;
969
970 task->t.regs.eax = 0x4f09;
971 task->t.regs.ebx = 0x0;
972 task->t.regs.ecx = count;
973 task->t.regs.edx = start;
974 task->t.flags = TF_BUF_ESDI;
975 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
976 task->buf = entries;
977
978 err = uvesafb_exec(task);
979 if ((task->t.regs.eax & 0xffff) != 0x004f)
980 err = 1;
981
982 uvesafb_free(task);
983 }
984 return err;
985}
986
987static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
988 unsigned blue, unsigned transp,
989 struct fb_info *info)
990{
991 struct uvesafb_pal_entry entry;
992 int shift = 16 - dac_width;
993 int err = 0;
994
995 if (regno >= info->cmap.len)
996 return -EINVAL;
997
998 if (info->var.bits_per_pixel == 8) {
999 entry.red = red >> shift;
1000 entry.green = green >> shift;
1001 entry.blue = blue >> shift;
1002 entry.pad = 0;
1003
1004 err = uvesafb_setpalette(&entry, 1, regno, info);
1005 } else if (regno < 16) {
1006 switch (info->var.bits_per_pixel) {
1007 case 16:
1008 if (info->var.red.offset == 10) {
1009 /* 1:5:5:5 */
1010 ((u32 *) (info->pseudo_palette))[regno] =
1011 ((red & 0xf800) >> 1) |
1012 ((green & 0xf800) >> 6) |
1013 ((blue & 0xf800) >> 11);
1014 } else {
1015 /* 0:5:6:5 */
1016 ((u32 *) (info->pseudo_palette))[regno] =
1017 ((red & 0xf800) ) |
1018 ((green & 0xfc00) >> 5) |
1019 ((blue & 0xf800) >> 11);
1020 }
1021 break;
1022
1023 case 24:
1024 case 32:
1025 red >>= 8;
1026 green >>= 8;
1027 blue >>= 8;
1028 ((u32 *)(info->pseudo_palette))[regno] =
1029 (red << info->var.red.offset) |
1030 (green << info->var.green.offset) |
1031 (blue << info->var.blue.offset);
1032 break;
1033 }
1034 }
1035 return err;
1036}
1037
1038static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1039{
1040 struct uvesafb_pal_entry *entries;
1041 int shift = 16 - dac_width;
1042 int i, err = 0;
1043
1044 if (info->var.bits_per_pixel == 8) {
1045 if (cmap->start + cmap->len > info->cmap.start +
1046 info->cmap.len || cmap->start < info->cmap.start)
1047 return -EINVAL;
1048
1049 entries = kmalloc_objs(*entries, cmap->len);
1050 if (!entries)
1051 return -ENOMEM;
1052
1053 for (i = 0; i < cmap->len; i++) {
1054 entries[i].red = cmap->red[i] >> shift;
1055 entries[i].green = cmap->green[i] >> shift;
1056 entries[i].blue = cmap->blue[i] >> shift;
1057 entries[i].pad = 0;
1058 }
1059 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1060 kfree(entries);
1061 } else {
1062 /*
1063 * For modes with bpp > 8, we only set the pseudo palette in
1064 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1065 * sanity checking.
1066 */
1067 for (i = 0; i < cmap->len; i++) {
1068 err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1069 cmap->green[i], cmap->blue[i],
1070 0, info);
1071 }
1072 }
1073 return err;
1074}
1075
1076static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1077 struct fb_info *info)
1078{
1079#ifdef CONFIG_X86_32
1080 int offset;
1081 struct uvesafb_par *par = info->par;
1082
1083 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1084
1085 /*
1086 * It turns out it's not the best idea to do panning via vm86,
1087 * so we only allow it if we have a PMI.
1088 */
1089 if (par->pmi_start) {
1090 __asm__ __volatile__(
1091 "call *(%%edi)"
1092 : /* no return value */
1093 : "a" (0x4f07), /* EAX */
1094 "b" (0), /* EBX */
1095 "c" (offset), /* ECX */
1096 "d" (offset >> 16), /* EDX */
1097 "D" (&par->pmi_start)); /* EDI */
1098 }
1099#endif
1100 return 0;
1101}
1102
1103static int uvesafb_blank(int blank, struct fb_info *info)
1104{
1105 struct uvesafb_ktask *task;
1106 int err = 1;
1107#ifdef CONFIG_X86
1108 struct uvesafb_par *par = info->par;
1109
1110 if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1111 int loop = 10000;
1112 u8 seq = 0, crtc17 = 0;
1113
1114 if (blank == FB_BLANK_POWERDOWN) {
1115 seq = 0x20;
1116 crtc17 = 0x00;
1117 err = 0;
1118 } else {
1119 seq = 0x00;
1120 crtc17 = 0x80;
1121 err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1122 }
1123
1124 vga_wseq(NULL, 0x00, 0x01);
1125 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1126 vga_wseq(NULL, 0x00, seq);
1127
1128 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1129 while (loop--);
1130 vga_wcrt(NULL, 0x17, crtc17);
1131 vga_wseq(NULL, 0x00, 0x03);
1132 } else
1133#endif /* CONFIG_X86 */
1134 {
1135 task = uvesafb_prep();
1136 if (!task)
1137 return -ENOMEM;
1138
1139 task->t.regs.eax = 0x4f10;
1140 switch (blank) {
1141 case FB_BLANK_UNBLANK:
1142 task->t.regs.ebx = 0x0001;
1143 break;
1144 case FB_BLANK_NORMAL:
1145 task->t.regs.ebx = 0x0101; /* standby */
1146 break;
1147 case FB_BLANK_POWERDOWN:
1148 task->t.regs.ebx = 0x0401; /* powerdown */
1149 break;
1150 default:
1151 goto out;
1152 }
1153
1154 err = uvesafb_exec(task);
1155 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1156 err = 1;
1157out: uvesafb_free(task);
1158 }
1159 return err;
1160}
1161
1162static int uvesafb_open(struct fb_info *info, int user)
1163{
1164 struct uvesafb_par *par = info->par;
1165 int cnt = atomic_read(&par->ref_count);
1166 u8 *buf = NULL;
1167
1168 if (!cnt && par->vbe_state_size) {
1169 buf = uvesafb_vbe_state_save(par);
1170 if (IS_ERR(buf)) {
1171 pr_warn("save hardware state failed, error code is %ld!\n",
1172 PTR_ERR(buf));
1173 } else {
1174 par->vbe_state_orig = buf;
1175 }
1176 }
1177
1178 atomic_inc(&par->ref_count);
1179 return 0;
1180}
1181
1182static int uvesafb_release(struct fb_info *info, int user)
1183{
1184 struct uvesafb_ktask *task = NULL;
1185 struct uvesafb_par *par = info->par;
1186 int cnt = atomic_read(&par->ref_count);
1187
1188 if (!cnt)
1189 return -EINVAL;
1190
1191 if (cnt != 1)
1192 goto out;
1193
1194 task = uvesafb_prep();
1195 if (!task)
1196 goto out;
1197
1198 /* First, try to set the standard 80x25 text mode. */
1199 task->t.regs.eax = 0x0003;
1200 uvesafb_exec(task);
1201
1202 /*
1203 * Now try to restore whatever hardware state we might have
1204 * saved when the fb device was first opened.
1205 */
1206 uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1207out:
1208 atomic_dec(&par->ref_count);
1209 uvesafb_free(task);
1210 return 0;
1211}
1212
1213static int uvesafb_set_par(struct fb_info *info)
1214{
1215 struct uvesafb_par *par = info->par;
1216 struct uvesafb_ktask *task = NULL;
1217 struct vbe_crtc_ib *crtc = NULL;
1218 struct vbe_mode_ib *mode = NULL;
1219 int i, err = 0, depth = info->var.bits_per_pixel;
1220
1221 if (depth > 8 && depth != 32)
1222 depth = info->var.red.length + info->var.green.length +
1223 info->var.blue.length;
1224
1225 i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1226 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1227 if (i >= 0)
1228 mode = &par->vbe_modes[i];
1229 else
1230 return -EINVAL;
1231
1232 task = uvesafb_prep();
1233 if (!task)
1234 return -ENOMEM;
1235setmode:
1236 task->t.regs.eax = 0x4f02;
1237 task->t.regs.ebx = mode->mode_id | 0x4000; /* use LFB */
1238
1239 if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1240 info->var.pixclock != 0) {
1241 task->t.regs.ebx |= 0x0800; /* use CRTC data */
1242 task->t.flags = TF_BUF_ESDI;
1243 crtc = kzalloc_obj(struct vbe_crtc_ib);
1244 if (!crtc) {
1245 err = -ENOMEM;
1246 goto out;
1247 }
1248 crtc->horiz_start = info->var.xres + info->var.right_margin;
1249 crtc->horiz_end = crtc->horiz_start + info->var.hsync_len;
1250 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1251
1252 crtc->vert_start = info->var.yres + info->var.lower_margin;
1253 crtc->vert_end = crtc->vert_start + info->var.vsync_len;
1254 crtc->vert_total = crtc->vert_end + info->var.upper_margin;
1255
1256 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1257 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1258 (crtc->vert_total * crtc->horiz_total)));
1259
1260 if (info->var.vmode & FB_VMODE_DOUBLE)
1261 crtc->flags |= 0x1;
1262 if (info->var.vmode & FB_VMODE_INTERLACED)
1263 crtc->flags |= 0x2;
1264 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1265 crtc->flags |= 0x4;
1266 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1267 crtc->flags |= 0x8;
1268 memcpy(&par->crtc, crtc, sizeof(*crtc));
1269 } else {
1270 memset(&par->crtc, 0, sizeof(*crtc));
1271 }
1272
1273 task->t.buf_len = sizeof(struct vbe_crtc_ib);
1274 task->buf = &par->crtc;
1275
1276 err = uvesafb_exec(task);
1277 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1278 /*
1279 * The mode switch might have failed because we tried to
1280 * use our own timings. Try again with the default timings.
1281 */
1282 if (crtc != NULL) {
1283 pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n",
1284 task->t.regs.eax, err);
1285 uvesafb_reset(task);
1286 kfree(crtc);
1287 crtc = NULL;
1288 info->var.pixclock = 0;
1289 goto setmode;
1290 } else {
1291 pr_err("mode switch failed (eax=0x%x, err=%d)\n",
1292 task->t.regs.eax, err);
1293 err = -EINVAL;
1294 goto out;
1295 }
1296 }
1297 par->mode_idx = i;
1298
1299 /* For 8bpp modes, always try to set the DAC to 8 bits. */
1300 if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1301 mode->bits_per_pixel <= 8) {
1302 uvesafb_reset(task);
1303 task->t.regs.eax = 0x4f08;
1304 task->t.regs.ebx = 0x0800;
1305
1306 err = uvesafb_exec(task);
1307 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1308 ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1309 dac_width = 6;
1310 } else {
1311 dac_width = 8;
1312 }
1313 }
1314
1315 info->fix.visual = (info->var.bits_per_pixel == 8) ?
1316 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1317 info->fix.line_length = mode->bytes_per_scan_line;
1318
1319out:
1320 kfree(crtc);
1321 uvesafb_free(task);
1322
1323 return err;
1324}
1325
1326static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1327 struct fb_info *info)
1328{
1329 const struct fb_videomode *mode;
1330 struct uvesafb_par *par = info->par;
1331
1332 /*
1333 * If pixclock is set to 0, then we're using default BIOS timings
1334 * and thus don't have to perform any checks here.
1335 */
1336 if (!var->pixclock)
1337 return;
1338
1339 if (par->vbe_ib.vbe_version < 0x0300) {
1340 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1341 return;
1342 }
1343
1344 if (!fb_validate_mode(var, info))
1345 return;
1346
1347 mode = fb_find_best_mode(var, &info->modelist);
1348 if (mode) {
1349 if (mode->xres == var->xres && mode->yres == var->yres &&
1350 !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1351 fb_videomode_to_var(var, mode);
1352 return;
1353 }
1354 }
1355
1356 if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1357 return;
1358 /* Use default refresh rate */
1359 var->pixclock = 0;
1360}
1361
1362static int uvesafb_check_var(struct fb_var_screeninfo *var,
1363 struct fb_info *info)
1364{
1365 struct uvesafb_par *par = info->par;
1366 struct vbe_mode_ib *mode = NULL;
1367 int match = -1;
1368 int depth = var->red.length + var->green.length + var->blue.length;
1369
1370 /*
1371 * Various apps will use bits_per_pixel to set the color depth,
1372 * which is theoretically incorrect, but which we'll try to handle
1373 * here.
1374 */
1375 if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1376 depth = var->bits_per_pixel;
1377
1378 match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1379 UVESAFB_EXACT_RES);
1380 if (match == -1)
1381 return -EINVAL;
1382
1383 mode = &par->vbe_modes[match];
1384 uvesafb_setup_var(var, info, mode);
1385
1386 /*
1387 * Check whether we have remapped enough memory for this mode.
1388 * We might be called at an early stage, when we haven't remapped
1389 * any memory yet, in which case we simply skip the check.
1390 */
1391 if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1392 && info->fix.smem_len)
1393 return -EINVAL;
1394
1395 if ((var->vmode & FB_VMODE_DOUBLE) &&
1396 !(par->vbe_modes[match].mode_attr & 0x100))
1397 var->vmode &= ~FB_VMODE_DOUBLE;
1398
1399 if ((var->vmode & FB_VMODE_INTERLACED) &&
1400 !(par->vbe_modes[match].mode_attr & 0x200))
1401 var->vmode &= ~FB_VMODE_INTERLACED;
1402
1403 uvesafb_check_limits(var, info);
1404
1405 var->xres_virtual = var->xres;
1406 var->yres_virtual = (par->ypan) ?
1407 info->fix.smem_len / mode->bytes_per_scan_line :
1408 var->yres;
1409 return 0;
1410}
1411
1412static struct fb_ops uvesafb_ops = {
1413 .owner = THIS_MODULE,
1414 .fb_open = uvesafb_open,
1415 .fb_release = uvesafb_release,
1416 FB_DEFAULT_IOMEM_OPS,
1417 .fb_setcolreg = uvesafb_setcolreg,
1418 .fb_setcmap = uvesafb_setcmap,
1419 .fb_pan_display = uvesafb_pan_display,
1420 .fb_blank = uvesafb_blank,
1421 .fb_check_var = uvesafb_check_var,
1422 .fb_set_par = uvesafb_set_par,
1423};
1424
1425static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1426{
1427 unsigned int size_vmode;
1428 unsigned int size_remap;
1429 unsigned int size_total;
1430 struct uvesafb_par *par = info->par;
1431 int i, h;
1432
1433 info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1434 info->fix = uvesafb_fix;
1435 info->fix.ypanstep = par->ypan ? 1 : 0;
1436 info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1437
1438 /* Disable blanking if the user requested so. */
1439 if (!blank)
1440 uvesafb_ops.fb_blank = NULL;
1441
1442 /*
1443 * Find out how much IO memory is required for the mode with
1444 * the highest resolution.
1445 */
1446 size_remap = 0;
1447 for (i = 0; i < par->vbe_modes_cnt; i++) {
1448 h = par->vbe_modes[i].bytes_per_scan_line *
1449 par->vbe_modes[i].y_res;
1450 if (h > size_remap)
1451 size_remap = h;
1452 }
1453 size_remap *= 2;
1454
1455 /*
1456 * size_vmode -- that is the amount of memory needed for the
1457 * used video mode, i.e. the minimum amount of
1458 * memory we need.
1459 */
1460 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1461
1462 /*
1463 * size_total -- all video memory we have. Used for mtrr
1464 * entries, resource allocation and bounds
1465 * checking.
1466 */
1467 size_total = par->vbe_ib.total_memory * 65536;
1468 if (vram_total)
1469 size_total = vram_total * 1024 * 1024;
1470 if (size_total < size_vmode)
1471 size_total = size_vmode;
1472
1473 /*
1474 * size_remap -- the amount of video memory we are going to
1475 * use for vesafb. With modern cards it is no
1476 * option to simply use size_total as th
1477 * wastes plenty of kernel address space.
1478 */
1479 if (vram_remap)
1480 size_remap = vram_remap * 1024 * 1024;
1481 if (size_remap < size_vmode)
1482 size_remap = size_vmode;
1483 if (size_remap > size_total)
1484 size_remap = size_total;
1485
1486 info->fix.smem_len = size_remap;
1487 info->fix.smem_start = mode->phys_base_ptr;
1488
1489 /*
1490 * We have to set yres_virtual here because when setup_var() was
1491 * called, smem_len wasn't defined yet.
1492 */
1493 info->var.yres_virtual = info->fix.smem_len /
1494 mode->bytes_per_scan_line;
1495
1496 if (par->ypan && info->var.yres_virtual > info->var.yres) {
1497 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1498 (par->ypan > 1) ? "ywrap" : "ypan",
1499 info->var.yres_virtual);
1500 } else {
1501 pr_info("scrolling: redraw\n");
1502 info->var.yres_virtual = info->var.yres;
1503 par->ypan = 0;
1504 }
1505
1506 info->flags = (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1507
1508 if (!par->ypan)
1509 uvesafb_ops.fb_pan_display = NULL;
1510}
1511
1512static void uvesafb_init_mtrr(struct fb_info *info)
1513{
1514 struct uvesafb_par *par = info->par;
1515
1516 if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1517 int temp_size = info->fix.smem_len;
1518
1519 int rc;
1520
1521 /* Find the largest power-of-two */
1522 temp_size = roundup_pow_of_two(temp_size);
1523
1524 /* Try and find a power of two to add */
1525 do {
1526 rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1527 temp_size >>= 1;
1528 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1529
1530 if (rc >= 0)
1531 par->mtrr_handle = rc;
1532 }
1533}
1534
1535static void uvesafb_ioremap(struct fb_info *info)
1536{
1537 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1538}
1539
1540static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1541 struct device_attribute *attr, char *buf)
1542{
1543 struct fb_info *info = dev_get_drvdata(dev);
1544 struct uvesafb_par *par = info->par;
1545
1546 return sysfs_emit(buf, "%.4x\n", par->vbe_ib.vbe_version);
1547}
1548
1549static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1550
1551static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1552 struct device_attribute *attr, char *buf)
1553{
1554 struct fb_info *info = dev_get_drvdata(dev);
1555 struct uvesafb_par *par = info->par;
1556 int ret = 0, i;
1557
1558 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1559 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1560 "%dx%d-%d, 0x%.4x\n",
1561 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1562 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1563 }
1564
1565 return ret;
1566}
1567
1568static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1569
1570static ssize_t uvesafb_show_vendor(struct device *dev,
1571 struct device_attribute *attr, char *buf)
1572{
1573 struct fb_info *info = dev_get_drvdata(dev);
1574 struct uvesafb_par *par = info->par;
1575
1576 if (par->vbe_ib.oem_vendor_name_ptr)
1577 return sysfs_emit(buf, "%s\n", (char *)
1578 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1579 else
1580 return 0;
1581}
1582
1583static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1584
1585static ssize_t uvesafb_show_product_name(struct device *dev,
1586 struct device_attribute *attr, char *buf)
1587{
1588 struct fb_info *info = dev_get_drvdata(dev);
1589 struct uvesafb_par *par = info->par;
1590
1591 if (par->vbe_ib.oem_product_name_ptr)
1592 return sysfs_emit(buf, "%s\n", (char *)
1593 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1594 else
1595 return 0;
1596}
1597
1598static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1599
1600static ssize_t uvesafb_show_product_rev(struct device *dev,
1601 struct device_attribute *attr, char *buf)
1602{
1603 struct fb_info *info = dev_get_drvdata(dev);
1604 struct uvesafb_par *par = info->par;
1605
1606 if (par->vbe_ib.oem_product_rev_ptr)
1607 return sysfs_emit(buf, "%s\n", (char *)
1608 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1609 else
1610 return 0;
1611}
1612
1613static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1614
1615static ssize_t uvesafb_show_oem_string(struct device *dev,
1616 struct device_attribute *attr, char *buf)
1617{
1618 struct fb_info *info = dev_get_drvdata(dev);
1619 struct uvesafb_par *par = info->par;
1620
1621 if (par->vbe_ib.oem_string_ptr)
1622 return sysfs_emit(buf, "%s\n",
1623 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1624 else
1625 return 0;
1626}
1627
1628static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1629
1630static ssize_t uvesafb_show_nocrtc(struct device *dev,
1631 struct device_attribute *attr, char *buf)
1632{
1633 struct fb_info *info = dev_get_drvdata(dev);
1634 struct uvesafb_par *par = info->par;
1635
1636 return sysfs_emit(buf, "%d\n", par->nocrtc);
1637}
1638
1639static ssize_t uvesafb_store_nocrtc(struct device *dev,
1640 struct device_attribute *attr, const char *buf, size_t count)
1641{
1642 struct fb_info *info = dev_get_drvdata(dev);
1643 struct uvesafb_par *par = info->par;
1644
1645 if (count > 0) {
1646 if (buf[0] == '0')
1647 par->nocrtc = 0;
1648 else
1649 par->nocrtc = 1;
1650 }
1651 return count;
1652}
1653
1654static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1655 uvesafb_store_nocrtc);
1656
1657static struct attribute *uvesafb_dev_attrs[] = {
1658 &dev_attr_vbe_version.attr,
1659 &dev_attr_vbe_modes.attr,
1660 &dev_attr_oem_vendor.attr,
1661 &dev_attr_oem_product_name.attr,
1662 &dev_attr_oem_product_rev.attr,
1663 &dev_attr_oem_string.attr,
1664 &dev_attr_nocrtc.attr,
1665 NULL,
1666};
1667
1668static const struct attribute_group uvesafb_dev_attgrp = {
1669 .name = NULL,
1670 .attrs = uvesafb_dev_attrs,
1671};
1672
1673static int uvesafb_probe(struct platform_device *dev)
1674{
1675 struct fb_info *info;
1676 struct vbe_mode_ib *mode = NULL;
1677 struct uvesafb_par *par;
1678 int err = 0, i;
1679
1680 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1681 if (!info)
1682 return -ENOMEM;
1683
1684 par = info->par;
1685
1686 err = uvesafb_vbe_init(info);
1687 if (err) {
1688 pr_err("vbe_init() failed with %d\n", err);
1689 goto out;
1690 }
1691
1692 info->fbops = &uvesafb_ops;
1693
1694 i = uvesafb_vbe_init_mode(info);
1695 if (i < 0) {
1696 err = -EINVAL;
1697 goto out_mode;
1698 } else {
1699 mode = &par->vbe_modes[i];
1700 }
1701
1702 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1703 err = -ENXIO;
1704 goto out_mode;
1705 }
1706
1707 uvesafb_init_info(info, mode);
1708
1709 if (!request_region(0x3c0, 32, "uvesafb")) {
1710 pr_err("request region 0x3c0-0x3e0 failed\n");
1711 err = -EIO;
1712 goto out_mode;
1713 }
1714
1715 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1716 "uvesafb")) {
1717 pr_err("cannot reserve video memory at 0x%lx\n",
1718 info->fix.smem_start);
1719 err = -EIO;
1720 goto out_reg;
1721 }
1722
1723 uvesafb_init_mtrr(info);
1724 uvesafb_ioremap(info);
1725
1726 if (!info->screen_base) {
1727 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1728 info->fix.smem_len, info->fix.smem_start);
1729 err = -EIO;
1730 goto out_mem;
1731 }
1732
1733 platform_set_drvdata(dev, info);
1734
1735 if (register_framebuffer(info) < 0) {
1736 pr_err("failed to register framebuffer device\n");
1737 err = -EINVAL;
1738 goto out_unmap;
1739 }
1740
1741 pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1742 info->fix.smem_start, info->screen_base,
1743 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1744 fb_info(info, "%s frame buffer device\n", info->fix.id);
1745
1746 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1747 if (err != 0)
1748 fb_warn(info, "failed to register attributes\n");
1749
1750 return 0;
1751
1752out_unmap:
1753 iounmap(info->screen_base);
1754out_mem:
1755 arch_phys_wc_del(par->mtrr_handle);
1756 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1757out_reg:
1758 release_region(0x3c0, 32);
1759out_mode:
1760 if (!list_empty(&info->modelist))
1761 fb_destroy_modelist(&info->modelist);
1762 fb_destroy_modedb(info->monspecs.modedb);
1763 fb_dealloc_cmap(&info->cmap);
1764out:
1765 kfree(par->vbe_modes);
1766
1767 framebuffer_release(info);
1768 return err;
1769}
1770
1771static void uvesafb_remove(struct platform_device *dev)
1772{
1773 struct fb_info *info = platform_get_drvdata(dev);
1774 struct uvesafb_par *par = info->par;
1775
1776 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1777 unregister_framebuffer(info);
1778 release_region(0x3c0, 32);
1779 iounmap(info->screen_base);
1780 arch_phys_wc_del(par->mtrr_handle);
1781 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1782 fb_destroy_modedb(info->monspecs.modedb);
1783 fb_dealloc_cmap(&info->cmap);
1784
1785 kfree(par->vbe_modes);
1786 kfree(par->vbe_state_orig);
1787 kfree(par->vbe_state_saved);
1788
1789 framebuffer_release(info);
1790}
1791
1792static struct platform_driver uvesafb_driver = {
1793 .probe = uvesafb_probe,
1794 .remove = uvesafb_remove,
1795 .driver = {
1796 .name = "uvesafb",
1797 },
1798};
1799
1800static struct platform_device *uvesafb_device;
1801
1802#ifndef MODULE
1803static int uvesafb_setup(char *options)
1804{
1805 char *this_opt;
1806
1807 if (!options || !*options)
1808 return 0;
1809
1810 while ((this_opt = strsep(&options, ",")) != NULL) {
1811 if (!*this_opt) continue;
1812
1813 if (!strcmp(this_opt, "redraw"))
1814 ypan = 0;
1815 else if (!strcmp(this_opt, "ypan"))
1816 ypan = 1;
1817 else if (!strcmp(this_opt, "ywrap"))
1818 ypan = 2;
1819 else if (!strcmp(this_opt, "vgapal"))
1820 pmi_setpal = false;
1821 else if (!strcmp(this_opt, "pmipal"))
1822 pmi_setpal = true;
1823 else if (!strncmp(this_opt, "mtrr:", 5))
1824 mtrr = simple_strtoul(this_opt+5, NULL, 0);
1825 else if (!strcmp(this_opt, "nomtrr"))
1826 mtrr = 0;
1827 else if (!strcmp(this_opt, "nocrtc"))
1828 nocrtc = true;
1829 else if (!strcmp(this_opt, "noedid"))
1830 noedid = true;
1831 else if (!strcmp(this_opt, "noblank"))
1832 blank = false;
1833 else if (!strncmp(this_opt, "vtotal:", 7))
1834 vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1835 else if (!strncmp(this_opt, "vremap:", 7))
1836 vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1837 else if (!strncmp(this_opt, "maxhf:", 6))
1838 maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1839 else if (!strncmp(this_opt, "maxvf:", 6))
1840 maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1841 else if (!strncmp(this_opt, "maxclk:", 7))
1842 maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1843 else if (!strncmp(this_opt, "vbemode:", 8))
1844 vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1845 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1846 mode_option = this_opt;
1847 } else {
1848 pr_warn("unrecognized option %s\n", this_opt);
1849 }
1850 }
1851
1852 if (mtrr != 3 && mtrr != 0)
1853 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1854
1855 return 0;
1856}
1857#endif /* !MODULE */
1858
1859static ssize_t v86d_show(struct device_driver *dev, char *buf)
1860{
1861 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1862}
1863
1864static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1865 size_t count)
1866{
1867 strscpy_pad(v86d_path, buf);
1868 return count;
1869}
1870static DRIVER_ATTR_RW(v86d);
1871
1872static int uvesafb_init(void)
1873{
1874 int err;
1875
1876#ifndef MODULE
1877 char *option = NULL;
1878
1879 if (fb_get_options("uvesafb", &option))
1880 return -ENODEV;
1881 uvesafb_setup(option);
1882#endif
1883 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1884 if (err)
1885 return err;
1886
1887 err = platform_driver_register(&uvesafb_driver);
1888
1889 if (!err) {
1890 uvesafb_device = platform_device_alloc("uvesafb", 0);
1891 if (uvesafb_device)
1892 err = platform_device_add(uvesafb_device);
1893 else
1894 err = -ENOMEM;
1895
1896 if (err) {
1897 platform_device_put(uvesafb_device);
1898 platform_driver_unregister(&uvesafb_driver);
1899 cn_del_callback(&uvesafb_cn_id);
1900 return err;
1901 }
1902
1903 err = driver_create_file(&uvesafb_driver.driver,
1904 &driver_attr_v86d);
1905 if (err) {
1906 pr_warn("failed to register attributes\n");
1907 err = 0;
1908 }
1909 }
1910 if (err)
1911 cn_del_callback(&uvesafb_cn_id);
1912 return err;
1913}
1914
1915module_init(uvesafb_init);
1916
1917static void uvesafb_exit(void)
1918{
1919 struct uvesafb_ktask *task;
1920
1921 if (v86d_started) {
1922 task = uvesafb_prep();
1923 if (task) {
1924 task->t.flags = TF_EXIT;
1925 uvesafb_exec(task);
1926 uvesafb_free(task);
1927 }
1928 }
1929
1930 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1931 platform_device_unregister(uvesafb_device);
1932 platform_driver_unregister(&uvesafb_driver);
1933 cn_del_callback(&uvesafb_cn_id);
1934}
1935
1936module_exit(uvesafb_exit);
1937
1938static int param_set_scroll(const char *val, const struct kernel_param *kp)
1939{
1940 ypan = 0;
1941
1942 if (!strcmp(val, "redraw"))
1943 ypan = 0;
1944 else if (!strcmp(val, "ypan"))
1945 ypan = 1;
1946 else if (!strcmp(val, "ywrap"))
1947 ypan = 2;
1948 else
1949 return -EINVAL;
1950
1951 return 0;
1952}
1953static const struct kernel_param_ops param_ops_scroll = {
1954 .set = param_set_scroll,
1955};
1956#define param_check_scroll(name, p) __param_check(name, p, void)
1957
1958module_param_named(scroll, ypan, scroll, 0);
1959MODULE_PARM_DESC(scroll,
1960 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1961module_param_named(vgapal, pmi_setpal, invbool, 0);
1962MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1963module_param_named(pmipal, pmi_setpal, bool, 0);
1964MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1965module_param(mtrr, uint, 0);
1966MODULE_PARM_DESC(mtrr,
1967 "Memory Type Range Registers setting. Use 0 to disable.");
1968module_param(blank, bool, 0);
1969MODULE_PARM_DESC(blank, "Enable hardware blanking");
1970module_param(nocrtc, bool, 0);
1971MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1972module_param(noedid, bool, 0);
1973MODULE_PARM_DESC(noedid,
1974 "Ignore EDID-provided monitor limits when setting modes");
1975module_param(vram_remap, uint, 0);
1976MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1977module_param(vram_total, uint, 0);
1978MODULE_PARM_DESC(vram_total, "Set total amount of video memory [MiB]");
1979module_param(maxclk, ushort, 0);
1980MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1981module_param(maxhf, ushort, 0);
1982MODULE_PARM_DESC(maxhf,
1983 "Maximum horizontal frequency [kHz], overrides EDID data");
1984module_param(maxvf, ushort, 0);
1985MODULE_PARM_DESC(maxvf,
1986 "Maximum vertical frequency [Hz], overrides EDID data");
1987module_param(mode_option, charp, 0);
1988MODULE_PARM_DESC(mode_option,
1989 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1990module_param(vbemode, ushort, 0);
1991MODULE_PARM_DESC(vbemode,
1992 "VBE mode number to set, overrides the 'mode' option");
1993module_param_string(v86d, v86d_path, PATH_MAX, 0660);
1994MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
1995
1996MODULE_LICENSE("GPL");
1997MODULE_AUTHOR("Michal Januszewski <[email protected]>");
1998MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
1999