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Merge tag 'block-5.11-2021-01-10' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / drivers / video / fbdev / uvesafb.c
blobdef14ac0ebe14ce85ce9681bc648abe2251bb34e
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
33 static struct cb_id uvesafb_cn_id = {
34 .idx = CN_IDX_V86D,
35 .val = CN_VAL_V86D_UVESAFB
36 };
37 static char v86d_path[PATH_MAX] = "/sbin/v86d";
38 static char v86d_started; /* has v86d been started by uvesafb? */
39
40 static 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
47 static int mtrr = 3; /* enable mtrr by default */
48 static bool blank = true; /* enable blanking by default */
49 static int ypan = 1; /* 0: scroll, 1: ypan, 2: ywrap */
50 static bool pmi_setpal = true; /* use PMI for palette changes */
51 static bool nocrtc; /* ignore CRTC settings */
52 static bool noedid; /* don't try DDC transfers */
53 static int vram_remap; /* set amt. of memory to be used */
54 static int vram_total; /* set total amount of memory */
55 static u16 maxclk; /* maximum pixel clock */
56 static u16 maxvf; /* maximum vertical frequency */
57 static u16 maxhf; /* maximum horizontal frequency */
58 static u16 vbemode; /* force use of a specific VBE mode */
59 static char *mode_option;
60 static u8 dac_width = 6;
61
62 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
63 static 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 */
72 static 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
112 static 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 */
144 static 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 = prandom_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;
227 out:
228 kfree(m);
229 return err;
230 }
231
232 /*
233 * Free a uvesafb_ktask struct.
234 */
235 static 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 */
246 static 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 */
257 static 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
272 static 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
315 static 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
352 static 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
390 static 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
417 static 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 strncpy(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
475 static 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
554 static 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
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 */
597 static 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
613 static 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
674 static 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
753 static 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
781 static 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
821 out: uvesafb_free(task);
822 return err;
823 }
824
825 static 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 = kcalloc(i, sizeof(*mode), GFP_KERNEL);
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
910 gotmode:
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
922 static 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
987 static 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
1038 static 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_array(cmap->len, sizeof(*entries),
1050 GFP_KERNEL);
1051 if (!entries)
1052 return -ENOMEM;
1053
1054 for (i = 0; i < cmap->len; i++) {
1055 entries[i].red = cmap->red[i] >> shift;
1056 entries[i].green = cmap->green[i] >> shift;
1057 entries[i].blue = cmap->blue[i] >> shift;
1058 entries[i].pad = 0;
1059 }
1060 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1061 kfree(entries);
1062 } else {
1063 /*
1064 * For modes with bpp > 8, we only set the pseudo palette in
1065 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1066 * sanity checking.
1067 */
1068 for (i = 0; i < cmap->len; i++) {
1069 err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1070 cmap->green[i], cmap->blue[i],
1071 0, info);
1072 }
1073 }
1074 return err;
1075 }
1076
1077 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1078 struct fb_info *info)
1079 {
1080 #ifdef CONFIG_X86_32
1081 int offset;
1082 struct uvesafb_par *par = info->par;
1083
1084 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1085
1086 /*
1087 * It turns out it's not the best idea to do panning via vm86,
1088 * so we only allow it if we have a PMI.
1089 */
1090 if (par->pmi_start) {
1091 __asm__ __volatile__(
1092 "call *(%%edi)"
1093 : /* no return value */
1094 : "a" (0x4f07), /* EAX */
1095 "b" (0), /* EBX */
1096 "c" (offset), /* ECX */
1097 "d" (offset >> 16), /* EDX */
1098 "D" (&par->pmi_start)); /* EDI */
1099 }
1100 #endif
1101 return 0;
1102 }
1103
1104 static int uvesafb_blank(int blank, struct fb_info *info)
1105 {
1106 struct uvesafb_ktask *task;
1107 int err = 1;
1108 #ifdef CONFIG_X86
1109 struct uvesafb_par *par = info->par;
1110
1111 if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1112 int loop = 10000;
1113 u8 seq = 0, crtc17 = 0;
1114
1115 if (blank == FB_BLANK_POWERDOWN) {
1116 seq = 0x20;
1117 crtc17 = 0x00;
1118 err = 0;
1119 } else {
1120 seq = 0x00;
1121 crtc17 = 0x80;
1122 err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1123 }
1124
1125 vga_wseq(NULL, 0x00, 0x01);
1126 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1127 vga_wseq(NULL, 0x00, seq);
1128
1129 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1130 while (loop--);
1131 vga_wcrt(NULL, 0x17, crtc17);
1132 vga_wseq(NULL, 0x00, 0x03);
1133 } else
1134 #endif /* CONFIG_X86 */
1135 {
1136 task = uvesafb_prep();
1137 if (!task)
1138 return -ENOMEM;
1139
1140 task->t.regs.eax = 0x4f10;
1141 switch (blank) {
1142 case FB_BLANK_UNBLANK:
1143 task->t.regs.ebx = 0x0001;
1144 break;
1145 case FB_BLANK_NORMAL:
1146 task->t.regs.ebx = 0x0101; /* standby */
1147 break;
1148 case FB_BLANK_POWERDOWN:
1149 task->t.regs.ebx = 0x0401; /* powerdown */
1150 break;
1151 default:
1152 goto out;
1153 }
1154
1155 err = uvesafb_exec(task);
1156 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1157 err = 1;
1158 out: uvesafb_free(task);
1159 }
1160 return err;
1161 }
1162
1163 static int uvesafb_open(struct fb_info *info, int user)
1164 {
1165 struct uvesafb_par *par = info->par;
1166 int cnt = atomic_read(&par->ref_count);
1167 u8 *buf = NULL;
1168
1169 if (!cnt && par->vbe_state_size) {
1170 buf = uvesafb_vbe_state_save(par);
1171 if (IS_ERR(buf)) {
1172 pr_warn("save hardware state failed, error code is %ld!\n",
1173 PTR_ERR(buf));
1174 } else {
1175 par->vbe_state_orig = buf;
1176 }
1177 }
1178
1179 atomic_inc(&par->ref_count);
1180 return 0;
1181 }
1182
1183 static int uvesafb_release(struct fb_info *info, int user)
1184 {
1185 struct uvesafb_ktask *task = NULL;
1186 struct uvesafb_par *par = info->par;
1187 int cnt = atomic_read(&par->ref_count);
1188
1189 if (!cnt)
1190 return -EINVAL;
1191
1192 if (cnt != 1)
1193 goto out;
1194
1195 task = uvesafb_prep();
1196 if (!task)
1197 goto out;
1198
1199 /* First, try to set the standard 80x25 text mode. */
1200 task->t.regs.eax = 0x0003;
1201 uvesafb_exec(task);
1202
1203 /*
1204 * Now try to restore whatever hardware state we might have
1205 * saved when the fb device was first opened.
1206 */
1207 uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1208 out:
1209 atomic_dec(&par->ref_count);
1210 uvesafb_free(task);
1211 return 0;
1212 }
1213
1214 static int uvesafb_set_par(struct fb_info *info)
1215 {
1216 struct uvesafb_par *par = info->par;
1217 struct uvesafb_ktask *task = NULL;
1218 struct vbe_crtc_ib *crtc = NULL;
1219 struct vbe_mode_ib *mode = NULL;
1220 int i, err = 0, depth = info->var.bits_per_pixel;
1221
1222 if (depth > 8 && depth != 32)
1223 depth = info->var.red.length + info->var.green.length +
1224 info->var.blue.length;
1225
1226 i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1227 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1228 if (i >= 0)
1229 mode = &par->vbe_modes[i];
1230 else
1231 return -EINVAL;
1232
1233 task = uvesafb_prep();
1234 if (!task)
1235 return -ENOMEM;
1236 setmode:
1237 task->t.regs.eax = 0x4f02;
1238 task->t.regs.ebx = mode->mode_id | 0x4000; /* use LFB */
1239
1240 if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1241 info->var.pixclock != 0) {
1242 task->t.regs.ebx |= 0x0800; /* use CRTC data */
1243 task->t.flags = TF_BUF_ESDI;
1244 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1245 if (!crtc) {
1246 err = -ENOMEM;
1247 goto out;
1248 }
1249 crtc->horiz_start = info->var.xres + info->var.right_margin;
1250 crtc->horiz_end = crtc->horiz_start + info->var.hsync_len;
1251 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1252
1253 crtc->vert_start = info->var.yres + info->var.lower_margin;
1254 crtc->vert_end = crtc->vert_start + info->var.vsync_len;
1255 crtc->vert_total = crtc->vert_end + info->var.upper_margin;
1256
1257 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1258 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1259 (crtc->vert_total * crtc->horiz_total)));
1260
1261 if (info->var.vmode & FB_VMODE_DOUBLE)
1262 crtc->flags |= 0x1;
1263 if (info->var.vmode & FB_VMODE_INTERLACED)
1264 crtc->flags |= 0x2;
1265 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1266 crtc->flags |= 0x4;
1267 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1268 crtc->flags |= 0x8;
1269 memcpy(&par->crtc, crtc, sizeof(*crtc));
1270 } else {
1271 memset(&par->crtc, 0, sizeof(*crtc));
1272 }
1273
1274 task->t.buf_len = sizeof(struct vbe_crtc_ib);
1275 task->buf = &par->crtc;
1276
1277 err = uvesafb_exec(task);
1278 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1279 /*
1280 * The mode switch might have failed because we tried to
1281 * use our own timings. Try again with the default timings.
1282 */
1283 if (crtc != NULL) {
1284 pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n",
1285 task->t.regs.eax, err);
1286 uvesafb_reset(task);
1287 kfree(crtc);
1288 crtc = NULL;
1289 info->var.pixclock = 0;
1290 goto setmode;
1291 } else {
1292 pr_err("mode switch failed (eax=0x%x, err=%d)\n",
1293 task->t.regs.eax, err);
1294 err = -EINVAL;
1295 goto out;
1296 }
1297 }
1298 par->mode_idx = i;
1299
1300 /* For 8bpp modes, always try to set the DAC to 8 bits. */
1301 if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1302 mode->bits_per_pixel <= 8) {
1303 uvesafb_reset(task);
1304 task->t.regs.eax = 0x4f08;
1305 task->t.regs.ebx = 0x0800;
1306
1307 err = uvesafb_exec(task);
1308 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1309 ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1310 dac_width = 6;
1311 } else {
1312 dac_width = 8;
1313 }
1314 }
1315
1316 info->fix.visual = (info->var.bits_per_pixel == 8) ?
1317 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1318 info->fix.line_length = mode->bytes_per_scan_line;
1319
1320 out:
1321 kfree(crtc);
1322 uvesafb_free(task);
1323
1324 return err;
1325 }
1326
1327 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1328 struct fb_info *info)
1329 {
1330 const struct fb_videomode *mode;
1331 struct uvesafb_par *par = info->par;
1332
1333 /*
1334 * If pixclock is set to 0, then we're using default BIOS timings
1335 * and thus don't have to perform any checks here.
1336 */
1337 if (!var->pixclock)
1338 return;
1339
1340 if (par->vbe_ib.vbe_version < 0x0300) {
1341 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1342 return;
1343 }
1344
1345 if (!fb_validate_mode(var, info))
1346 return;
1347
1348 mode = fb_find_best_mode(var, &info->modelist);
1349 if (mode) {
1350 if (mode->xres == var->xres && mode->yres == var->yres &&
1351 !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1352 fb_videomode_to_var(var, mode);
1353 return;
1354 }
1355 }
1356
1357 if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1358 return;
1359 /* Use default refresh rate */
1360 var->pixclock = 0;
1361 }
1362
1363 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1364 struct fb_info *info)
1365 {
1366 struct uvesafb_par *par = info->par;
1367 struct vbe_mode_ib *mode = NULL;
1368 int match = -1;
1369 int depth = var->red.length + var->green.length + var->blue.length;
1370
1371 /*
1372 * Various apps will use bits_per_pixel to set the color depth,
1373 * which is theoretically incorrect, but which we'll try to handle
1374 * here.
1375 */
1376 if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1377 depth = var->bits_per_pixel;
1378
1379 match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1380 UVESAFB_EXACT_RES);
1381 if (match == -1)
1382 return -EINVAL;
1383
1384 mode = &par->vbe_modes[match];
1385 uvesafb_setup_var(var, info, mode);
1386
1387 /*
1388 * Check whether we have remapped enough memory for this mode.
1389 * We might be called at an early stage, when we haven't remapped
1390 * any memory yet, in which case we simply skip the check.
1391 */
1392 if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1393 && info->fix.smem_len)
1394 return -EINVAL;
1395
1396 if ((var->vmode & FB_VMODE_DOUBLE) &&
1397 !(par->vbe_modes[match].mode_attr & 0x100))
1398 var->vmode &= ~FB_VMODE_DOUBLE;
1399
1400 if ((var->vmode & FB_VMODE_INTERLACED) &&
1401 !(par->vbe_modes[match].mode_attr & 0x200))
1402 var->vmode &= ~FB_VMODE_INTERLACED;
1403
1404 uvesafb_check_limits(var, info);
1405
1406 var->xres_virtual = var->xres;
1407 var->yres_virtual = (par->ypan) ?
1408 info->fix.smem_len / mode->bytes_per_scan_line :
1409 var->yres;
1410 return 0;
1411 }
1412
1413 static struct fb_ops uvesafb_ops = {
1414 .owner = THIS_MODULE,
1415 .fb_open = uvesafb_open,
1416 .fb_release = uvesafb_release,
1417 .fb_setcolreg = uvesafb_setcolreg,
1418 .fb_setcmap = uvesafb_setcmap,
1419 .fb_pan_display = uvesafb_pan_display,
1420 .fb_blank = uvesafb_blank,
1421 .fb_fillrect = cfb_fillrect,
1422 .fb_copyarea = cfb_copyarea,
1423 .fb_imageblit = cfb_imageblit,
1424 .fb_check_var = uvesafb_check_var,
1425 .fb_set_par = uvesafb_set_par,
1426 };
1427
1428 static 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 = FBINFO_FLAG_DEFAULT |
1510 (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1511
1512 if (!par->ypan)
1513 uvesafb_ops.fb_pan_display = NULL;
1514 }
1515
1516 static void uvesafb_init_mtrr(struct fb_info *info)
1517 {
1518 struct uvesafb_par *par = info->par;
1519
1520 if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1521 int temp_size = info->fix.smem_len;
1522
1523 int rc;
1524
1525 /* Find the largest power-of-two */
1526 temp_size = roundup_pow_of_two(temp_size);
1527
1528 /* Try and find a power of two to add */
1529 do {
1530 rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1531 temp_size >>= 1;
1532 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1533
1534 if (rc >= 0)
1535 par->mtrr_handle = rc;
1536 }
1537 }
1538
1539 static void uvesafb_ioremap(struct fb_info *info)
1540 {
1541 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1542 }
1543
1544 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1545 struct device_attribute *attr, char *buf)
1546 {
1547 struct fb_info *info = dev_get_drvdata(dev);
1548 struct uvesafb_par *par = info->par;
1549
1550 return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1551 }
1552
1553 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1554
1555 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1556 struct device_attribute *attr, char *buf)
1557 {
1558 struct fb_info *info = dev_get_drvdata(dev);
1559 struct uvesafb_par *par = info->par;
1560 int ret = 0, i;
1561
1562 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1563 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1564 "%dx%d-%d, 0x%.4x\n",
1565 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1566 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1567 }
1568
1569 return ret;
1570 }
1571
1572 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1573
1574 static ssize_t uvesafb_show_vendor(struct device *dev,
1575 struct device_attribute *attr, char *buf)
1576 {
1577 struct fb_info *info = dev_get_drvdata(dev);
1578 struct uvesafb_par *par = info->par;
1579
1580 if (par->vbe_ib.oem_vendor_name_ptr)
1581 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1582 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1583 else
1584 return 0;
1585 }
1586
1587 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1588
1589 static ssize_t uvesafb_show_product_name(struct device *dev,
1590 struct device_attribute *attr, char *buf)
1591 {
1592 struct fb_info *info = dev_get_drvdata(dev);
1593 struct uvesafb_par *par = info->par;
1594
1595 if (par->vbe_ib.oem_product_name_ptr)
1596 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1597 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1598 else
1599 return 0;
1600 }
1601
1602 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1603
1604 static ssize_t uvesafb_show_product_rev(struct device *dev,
1605 struct device_attribute *attr, char *buf)
1606 {
1607 struct fb_info *info = dev_get_drvdata(dev);
1608 struct uvesafb_par *par = info->par;
1609
1610 if (par->vbe_ib.oem_product_rev_ptr)
1611 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1612 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1613 else
1614 return 0;
1615 }
1616
1617 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1618
1619 static ssize_t uvesafb_show_oem_string(struct device *dev,
1620 struct device_attribute *attr, char *buf)
1621 {
1622 struct fb_info *info = dev_get_drvdata(dev);
1623 struct uvesafb_par *par = info->par;
1624
1625 if (par->vbe_ib.oem_string_ptr)
1626 return snprintf(buf, PAGE_SIZE, "%s\n",
1627 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1628 else
1629 return 0;
1630 }
1631
1632 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1633
1634 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1635 struct device_attribute *attr, char *buf)
1636 {
1637 struct fb_info *info = dev_get_drvdata(dev);
1638 struct uvesafb_par *par = info->par;
1639
1640 return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1641 }
1642
1643 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1644 struct device_attribute *attr, const char *buf, size_t count)
1645 {
1646 struct fb_info *info = dev_get_drvdata(dev);
1647 struct uvesafb_par *par = info->par;
1648
1649 if (count > 0) {
1650 if (buf[0] == '0')
1651 par->nocrtc = 0;
1652 else
1653 par->nocrtc = 1;
1654 }
1655 return count;
1656 }
1657
1658 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1659 uvesafb_store_nocrtc);
1660
1661 static struct attribute *uvesafb_dev_attrs[] = {
1662 &dev_attr_vbe_version.attr,
1663 &dev_attr_vbe_modes.attr,
1664 &dev_attr_oem_vendor.attr,
1665 &dev_attr_oem_product_name.attr,
1666 &dev_attr_oem_product_rev.attr,
1667 &dev_attr_oem_string.attr,
1668 &dev_attr_nocrtc.attr,
1669 NULL,
1670 };
1671
1672 static const struct attribute_group uvesafb_dev_attgrp = {
1673 .name = NULL,
1674 .attrs = uvesafb_dev_attrs,
1675 };
1676
1677 static int uvesafb_probe(struct platform_device *dev)
1678 {
1679 struct fb_info *info;
1680 struct vbe_mode_ib *mode = NULL;
1681 struct uvesafb_par *par;
1682 int err = 0, i;
1683
1684 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1685 if (!info)
1686 return -ENOMEM;
1687
1688 par = info->par;
1689
1690 err = uvesafb_vbe_init(info);
1691 if (err) {
1692 pr_err("vbe_init() failed with %d\n", err);
1693 goto out;
1694 }
1695
1696 info->fbops = &uvesafb_ops;
1697
1698 i = uvesafb_vbe_init_mode(info);
1699 if (i < 0) {
1700 err = -EINVAL;
1701 goto out;
1702 } else {
1703 mode = &par->vbe_modes[i];
1704 }
1705
1706 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1707 err = -ENXIO;
1708 goto out;
1709 }
1710
1711 uvesafb_init_info(info, mode);
1712
1713 if (!request_region(0x3c0, 32, "uvesafb")) {
1714 pr_err("request region 0x3c0-0x3e0 failed\n");
1715 err = -EIO;
1716 goto out_mode;
1717 }
1718
1719 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1720 "uvesafb")) {
1721 pr_err("cannot reserve video memory at 0x%lx\n",
1722 info->fix.smem_start);
1723 err = -EIO;
1724 goto out_reg;
1725 }
1726
1727 uvesafb_init_mtrr(info);
1728 uvesafb_ioremap(info);
1729
1730 if (!info->screen_base) {
1731 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1732 info->fix.smem_len, info->fix.smem_start);
1733 err = -EIO;
1734 goto out_mem;
1735 }
1736
1737 platform_set_drvdata(dev, info);
1738
1739 if (register_framebuffer(info) < 0) {
1740 pr_err("failed to register framebuffer device\n");
1741 err = -EINVAL;
1742 goto out_unmap;
1743 }
1744
1745 pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1746 info->fix.smem_start, info->screen_base,
1747 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1748 fb_info(info, "%s frame buffer device\n", info->fix.id);
1749
1750 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1751 if (err != 0)
1752 fb_warn(info, "failed to register attributes\n");
1753
1754 return 0;
1755
1756 out_unmap:
1757 iounmap(info->screen_base);
1758 out_mem:
1759 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1760 out_reg:
1761 release_region(0x3c0, 32);
1762 out_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);
1767 out:
1768 kfree(par->vbe_modes);
1769
1770 framebuffer_release(info);
1771 return err;
1772 }
1773
1774 static int uvesafb_remove(struct platform_device *dev)
1775 {
1776 struct fb_info *info = platform_get_drvdata(dev);
1777
1778 if (info) {
1779 struct uvesafb_par *par = info->par;
1780
1781 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1782 unregister_framebuffer(info);
1783 release_region(0x3c0, 32);
1784 iounmap(info->screen_base);
1785 arch_phys_wc_del(par->mtrr_handle);
1786 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1787 fb_destroy_modedb(info->monspecs.modedb);
1788 fb_dealloc_cmap(&info->cmap);
1789
1790 kfree(par->vbe_modes);
1791 kfree(par->vbe_state_orig);
1792 kfree(par->vbe_state_saved);
1793
1794 framebuffer_release(info);
1795 }
1796 return 0;
1797 }
1798
1799 static struct platform_driver uvesafb_driver = {
1800 .probe = uvesafb_probe,
1801 .remove = uvesafb_remove,
1802 .driver = {
1803 .name = "uvesafb",
1804 },
1805 };
1806
1807 static struct platform_device *uvesafb_device;
1808
1809 #ifndef MODULE
1810 static int uvesafb_setup(char *options)
1811 {
1812 char *this_opt;
1813
1814 if (!options || !*options)
1815 return 0;
1816
1817 while ((this_opt = strsep(&options, ",")) != NULL) {
1818 if (!*this_opt) continue;
1819
1820 if (!strcmp(this_opt, "redraw"))
1821 ypan = 0;
1822 else if (!strcmp(this_opt, "ypan"))
1823 ypan = 1;
1824 else if (!strcmp(this_opt, "ywrap"))
1825 ypan = 2;
1826 else if (!strcmp(this_opt, "vgapal"))
1827 pmi_setpal = false;
1828 else if (!strcmp(this_opt, "pmipal"))
1829 pmi_setpal = true;
1830 else if (!strncmp(this_opt, "mtrr:", 5))
1831 mtrr = simple_strtoul(this_opt+5, NULL, 0);
1832 else if (!strcmp(this_opt, "nomtrr"))
1833 mtrr = 0;
1834 else if (!strcmp(this_opt, "nocrtc"))
1835 nocrtc = true;
1836 else if (!strcmp(this_opt, "noedid"))
1837 noedid = true;
1838 else if (!strcmp(this_opt, "noblank"))
1839 blank = false;
1840 else if (!strncmp(this_opt, "vtotal:", 7))
1841 vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1842 else if (!strncmp(this_opt, "vremap:", 7))
1843 vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1844 else if (!strncmp(this_opt, "maxhf:", 6))
1845 maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1846 else if (!strncmp(this_opt, "maxvf:", 6))
1847 maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1848 else if (!strncmp(this_opt, "maxclk:", 7))
1849 maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1850 else if (!strncmp(this_opt, "vbemode:", 8))
1851 vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1852 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1853 mode_option = this_opt;
1854 } else {
1855 pr_warn("unrecognized option %s\n", this_opt);
1856 }
1857 }
1858
1859 if (mtrr != 3 && mtrr != 0)
1860 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1861
1862 return 0;
1863 }
1864 #endif /* !MODULE */
1865
1866 static ssize_t v86d_show(struct device_driver *dev, char *buf)
1867 {
1868 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1869 }
1870
1871 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1872 size_t count)
1873 {
1874 strncpy(v86d_path, buf, PATH_MAX);
1875 return count;
1876 }
1877 static DRIVER_ATTR_RW(v86d);
1878
1879 static int uvesafb_init(void)
1880 {
1881 int err;
1882
1883 #ifndef MODULE
1884 char *option = NULL;
1885
1886 if (fb_get_options("uvesafb", &option))
1887 return -ENODEV;
1888 uvesafb_setup(option);
1889 #endif
1890 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1891 if (err)
1892 return err;
1893
1894 err = platform_driver_register(&uvesafb_driver);
1895
1896 if (!err) {
1897 uvesafb_device = platform_device_alloc("uvesafb", 0);
1898 if (uvesafb_device)
1899 err = platform_device_add(uvesafb_device);
1900 else
1901 err = -ENOMEM;
1902
1903 if (err) {
1904 platform_device_put(uvesafb_device);
1905 platform_driver_unregister(&uvesafb_driver);
1906 cn_del_callback(&uvesafb_cn_id);
1907 return err;
1908 }
1909
1910 err = driver_create_file(&uvesafb_driver.driver,
1911 &driver_attr_v86d);
1912 if (err) {
1913 pr_warn("failed to register attributes\n");
1914 err = 0;
1915 }
1916 }
1917 return err;
1918 }
1919
1920 module_init(uvesafb_init);
1921
1922 static void uvesafb_exit(void)
1923 {
1924 struct uvesafb_ktask *task;
1925
1926 if (v86d_started) {
1927 task = uvesafb_prep();
1928 if (task) {
1929 task->t.flags = TF_EXIT;
1930 uvesafb_exec(task);
1931 uvesafb_free(task);
1932 }
1933 }
1934
1935 cn_del_callback(&uvesafb_cn_id);
1936 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1937 platform_device_unregister(uvesafb_device);
1938 platform_driver_unregister(&uvesafb_driver);
1939 }
1940
1941 module_exit(uvesafb_exit);
1942
1943 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1944 {
1945 ypan = 0;
1946
1947 if (!strcmp(val, "redraw"))
1948 ypan = 0;
1949 else if (!strcmp(val, "ypan"))
1950 ypan = 1;
1951 else if (!strcmp(val, "ywrap"))
1952 ypan = 2;
1953 else
1954 return -EINVAL;
1955
1956 return 0;
1957 }
1958 static const struct kernel_param_ops param_ops_scroll = {
1959 .set = param_set_scroll,
1960 };
1961 #define param_check_scroll(name, p) __param_check(name, p, void)
1962
1963 module_param_named(scroll, ypan, scroll, 0);
1964 MODULE_PARM_DESC(scroll,
1965 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1966 module_param_named(vgapal, pmi_setpal, invbool, 0);
1967 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1968 module_param_named(pmipal, pmi_setpal, bool, 0);
1969 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1970 module_param(mtrr, uint, 0);
1971 MODULE_PARM_DESC(mtrr,
1972 "Memory Type Range Registers setting. Use 0 to disable.");
1973 module_param(blank, bool, 0);
1974 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1975 module_param(nocrtc, bool, 0);
1976 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1977 module_param(noedid, bool, 0);
1978 MODULE_PARM_DESC(noedid,
1979 "Ignore EDID-provided monitor limits when setting modes");
1980 module_param(vram_remap, uint, 0);
1981 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1982 module_param(vram_total, uint, 0);
1983 MODULE_PARM_DESC(vram_total, "Set total amount of video memory [MiB]");
1984 module_param(maxclk, ushort, 0);
1985 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1986 module_param(maxhf, ushort, 0);
1987 MODULE_PARM_DESC(maxhf,
1988 "Maximum horizontal frequency [kHz], overrides EDID data");
1989 module_param(maxvf, ushort, 0);
1990 MODULE_PARM_DESC(maxvf,
1991 "Maximum vertical frequency [Hz], overrides EDID data");
1992 module_param(mode_option, charp, 0);
1993 MODULE_PARM_DESC(mode_option,
1994 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1995 module_param(vbemode, ushort, 0);
1996 MODULE_PARM_DESC(vbemode,
1997 "VBE mode number to set, overrides the 'mode' option");
1998 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
1999 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2000
2001 MODULE_LICENSE("GPL");
2002 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2003 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2004
Linux with added FPC-III support