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Linux 4.19.133
[linux/fpc-iii.git] / drivers / video / fbdev / uvesafb.c
blob440a6636d8f0a894648efcfbd15f38ea8f80ddea
1 /*
2 * A framebuffer driver for VBE 2.0+ compliant video cards
3 *
4 * (c) 2007 Michal Januszewski <spock@gentoo.org>
5 * Loosely based upon the vesafb driver.
6 *
7 */
8
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
10
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/skbuff.h>
15 #include <linux/timer.h>
16 #include <linux/completion.h>
17 #include <linux/connector.h>
18 #include <linux/random.h>
19 #include <linux/platform_device.h>
20 #include <linux/limits.h>
21 #include <linux/fb.h>
22 #include <linux/io.h>
23 #include <linux/mutex.h>
24 #include <linux/slab.h>
25 #include <video/edid.h>
26 #include <video/uvesafb.h>
27 #ifdef CONFIG_X86
28 #include <video/vga.h>
29 #endif
30 #include "edid.h"
31
32 static struct cb_id uvesafb_cn_id = {
33 .idx = CN_IDX_V86D,
34 .val = CN_VAL_V86D_UVESAFB
35 };
36 static char v86d_path[PATH_MAX] = "/sbin/v86d";
37 static char v86d_started; /* has v86d been started by uvesafb? */
38
39 static const struct fb_fix_screeninfo uvesafb_fix = {
40 .id = "VESA VGA",
41 .type = FB_TYPE_PACKED_PIXELS,
42 .accel = FB_ACCEL_NONE,
43 .visual = FB_VISUAL_TRUECOLOR,
44 };
45
46 static int mtrr = 3; /* enable mtrr by default */
47 static bool blank = 1; /* enable blanking by default */
48 static int ypan = 1; /* 0: scroll, 1: ypan, 2: ywrap */
49 static bool pmi_setpal = true; /* use PMI for palette changes */
50 static bool nocrtc; /* ignore CRTC settings */
51 static bool noedid; /* don't try DDC transfers */
52 static int vram_remap; /* set amt. of memory to be used */
53 static int vram_total; /* set total amount of memory */
54 static u16 maxclk; /* maximum pixel clock */
55 static u16 maxvf; /* maximum vertical frequency */
56 static u16 maxhf; /* maximum horizontal frequency */
57 static u16 vbemode; /* force use of a specific VBE mode */
58 static char *mode_option;
59 static u8 dac_width = 6;
60
61 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
62 static DEFINE_MUTEX(uvfb_lock);
63
64 /*
65 * A handler for replies from userspace.
66 *
67 * Make sure each message passes consistency checks and if it does,
68 * find the kernel part of the task struct, copy the registers and
69 * the buffer contents and then complete the task.
70 */
71 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
72 {
73 struct uvesafb_task *utask;
74 struct uvesafb_ktask *task;
75
76 if (!capable(CAP_SYS_ADMIN))
77 return;
78
79 if (msg->seq >= UVESAFB_TASKS_MAX)
80 return;
81
82 mutex_lock(&uvfb_lock);
83 task = uvfb_tasks[msg->seq];
84
85 if (!task || msg->ack != task->ack) {
86 mutex_unlock(&uvfb_lock);
87 return;
88 }
89
90 utask = (struct uvesafb_task *)msg->data;
91
92 /* Sanity checks for the buffer length. */
93 if (task->t.buf_len < utask->buf_len ||
94 utask->buf_len > msg->len - sizeof(*utask)) {
95 mutex_unlock(&uvfb_lock);
96 return;
97 }
98
99 uvfb_tasks[msg->seq] = NULL;
100 mutex_unlock(&uvfb_lock);
101
102 memcpy(&task->t, utask, sizeof(*utask));
103
104 if (task->t.buf_len && task->buf)
105 memcpy(task->buf, utask + 1, task->t.buf_len);
106
107 complete(task->done);
108 return;
109 }
110
111 static int uvesafb_helper_start(void)
112 {
113 char *envp[] = {
114 "HOME=/",
115 "PATH=/sbin:/bin",
116 NULL,
117 };
118
119 char *argv[] = {
120 v86d_path,
121 NULL,
122 };
123
124 return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
125 }
126
127 /*
128 * Execute a uvesafb task.
129 *
130 * Returns 0 if the task is executed successfully.
131 *
132 * A message sent to the userspace consists of the uvesafb_task
133 * struct and (optionally) a buffer. The uvesafb_task struct is
134 * a simplified version of uvesafb_ktask (its kernel counterpart)
135 * containing only the register values, flags and the length of
136 * the buffer.
137 *
138 * Each message is assigned a sequence number (increased linearly)
139 * and a random ack number. The sequence number is used as a key
140 * for the uvfb_tasks array which holds pointers to uvesafb_ktask
141 * structs for all requests.
142 */
143 static int uvesafb_exec(struct uvesafb_ktask *task)
144 {
145 static int seq;
146 struct cn_msg *m;
147 int err;
148 int len = sizeof(task->t) + task->t.buf_len;
149
150 /*
151 * Check whether the message isn't longer than the maximum
152 * allowed by connector.
153 */
154 if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
155 pr_warn("message too long (%d), can't execute task\n",
156 (int)(sizeof(*m) + len));
157 return -E2BIG;
158 }
159
160 m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
161 if (!m)
162 return -ENOMEM;
163
164 init_completion(task->done);
165
166 memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
167 m->seq = seq;
168 m->len = len;
169 m->ack = prandom_u32();
170
171 /* uvesafb_task structure */
172 memcpy(m + 1, &task->t, sizeof(task->t));
173
174 /* Buffer */
175 memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
176
177 /*
178 * Save the message ack number so that we can find the kernel
179 * part of this task when a reply is received from userspace.
180 */
181 task->ack = m->ack;
182
183 mutex_lock(&uvfb_lock);
184
185 /* If all slots are taken -- bail out. */
186 if (uvfb_tasks[seq]) {
187 mutex_unlock(&uvfb_lock);
188 err = -EBUSY;
189 goto out;
190 }
191
192 /* Save a pointer to the kernel part of the task struct. */
193 uvfb_tasks[seq] = task;
194 mutex_unlock(&uvfb_lock);
195
196 err = cn_netlink_send(m, 0, 0, GFP_KERNEL);
197 if (err == -ESRCH) {
198 /*
199 * Try to start the userspace helper if sending
200 * the request failed the first time.
201 */
202 err = uvesafb_helper_start();
203 if (err) {
204 pr_err("failed to execute %s\n", v86d_path);
205 pr_err("make sure that the v86d helper is installed and executable\n");
206 } else {
207 v86d_started = 1;
208 err = cn_netlink_send(m, 0, 0, gfp_any());
209 if (err == -ENOBUFS)
210 err = 0;
211 }
212 } else if (err == -ENOBUFS)
213 err = 0;
214
215 if (!err && !(task->t.flags & TF_EXIT))
216 err = !wait_for_completion_timeout(task->done,
217 msecs_to_jiffies(UVESAFB_TIMEOUT));
218
219 mutex_lock(&uvfb_lock);
220 uvfb_tasks[seq] = NULL;
221 mutex_unlock(&uvfb_lock);
222
223 seq++;
224 if (seq >= UVESAFB_TASKS_MAX)
225 seq = 0;
226 out:
227 kfree(m);
228 return err;
229 }
230
231 /*
232 * Free a uvesafb_ktask struct.
233 */
234 static void uvesafb_free(struct uvesafb_ktask *task)
235 {
236 if (task) {
237 kfree(task->done);
238 kfree(task);
239 }
240 }
241
242 /*
243 * Prepare a uvesafb_ktask struct to be used again.
244 */
245 static void uvesafb_reset(struct uvesafb_ktask *task)
246 {
247 struct completion *cpl = task->done;
248
249 memset(task, 0, sizeof(*task));
250 task->done = cpl;
251 }
252
253 /*
254 * Allocate and prepare a uvesafb_ktask struct.
255 */
256 static struct uvesafb_ktask *uvesafb_prep(void)
257 {
258 struct uvesafb_ktask *task;
259
260 task = kzalloc(sizeof(*task), GFP_KERNEL);
261 if (task) {
262 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
263 if (!task->done) {
264 kfree(task);
265 task = NULL;
266 }
267 }
268 return task;
269 }
270
271 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
272 struct fb_info *info, struct vbe_mode_ib *mode)
273 {
274 struct uvesafb_par *par = info->par;
275
276 var->vmode = FB_VMODE_NONINTERLACED;
277 var->sync = FB_SYNC_VERT_HIGH_ACT;
278
279 var->xres = mode->x_res;
280 var->yres = mode->y_res;
281 var->xres_virtual = mode->x_res;
282 var->yres_virtual = (par->ypan) ?
283 info->fix.smem_len / mode->bytes_per_scan_line :
284 mode->y_res;
285 var->xoffset = 0;
286 var->yoffset = 0;
287 var->bits_per_pixel = mode->bits_per_pixel;
288
289 if (var->bits_per_pixel == 15)
290 var->bits_per_pixel = 16;
291
292 if (var->bits_per_pixel > 8) {
293 var->red.offset = mode->red_off;
294 var->red.length = mode->red_len;
295 var->green.offset = mode->green_off;
296 var->green.length = mode->green_len;
297 var->blue.offset = mode->blue_off;
298 var->blue.length = mode->blue_len;
299 var->transp.offset = mode->rsvd_off;
300 var->transp.length = mode->rsvd_len;
301 } else {
302 var->red.offset = 0;
303 var->green.offset = 0;
304 var->blue.offset = 0;
305 var->transp.offset = 0;
306
307 var->red.length = 8;
308 var->green.length = 8;
309 var->blue.length = 8;
310 var->transp.length = 0;
311 }
312 }
313
314 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
315 int xres, int yres, int depth, unsigned char flags)
316 {
317 int i, match = -1, h = 0, d = 0x7fffffff;
318
319 for (i = 0; i < par->vbe_modes_cnt; i++) {
320 h = abs(par->vbe_modes[i].x_res - xres) +
321 abs(par->vbe_modes[i].y_res - yres) +
322 abs(depth - par->vbe_modes[i].depth);
323
324 /*
325 * We have an exact match in terms of resolution
326 * and depth.
327 */
328 if (h == 0)
329 return i;
330
331 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
332 d = h;
333 match = i;
334 }
335 }
336 i = 1;
337
338 if (flags & UVESAFB_EXACT_DEPTH &&
339 par->vbe_modes[match].depth != depth)
340 i = 0;
341
342 if (flags & UVESAFB_EXACT_RES && d > 24)
343 i = 0;
344
345 if (i != 0)
346 return match;
347 else
348 return -1;
349 }
350
351 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
352 {
353 struct uvesafb_ktask *task;
354 u8 *state;
355 int err;
356
357 if (!par->vbe_state_size)
358 return NULL;
359
360 state = kmalloc(par->vbe_state_size, GFP_KERNEL);
361 if (!state)
362 return ERR_PTR(-ENOMEM);
363
364 task = uvesafb_prep();
365 if (!task) {
366 kfree(state);
367 return NULL;
368 }
369
370 task->t.regs.eax = 0x4f04;
371 task->t.regs.ecx = 0x000f;
372 task->t.regs.edx = 0x0001;
373 task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
374 task->t.buf_len = par->vbe_state_size;
375 task->buf = state;
376 err = uvesafb_exec(task);
377
378 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
379 pr_warn("VBE get state call failed (eax=0x%x, err=%d)\n",
380 task->t.regs.eax, err);
381 kfree(state);
382 state = NULL;
383 }
384
385 uvesafb_free(task);
386 return state;
387 }
388
389 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
390 {
391 struct uvesafb_ktask *task;
392 int err;
393
394 if (!state_buf)
395 return;
396
397 task = uvesafb_prep();
398 if (!task)
399 return;
400
401 task->t.regs.eax = 0x4f04;
402 task->t.regs.ecx = 0x000f;
403 task->t.regs.edx = 0x0002;
404 task->t.buf_len = par->vbe_state_size;
405 task->t.flags = TF_BUF_ESBX;
406 task->buf = state_buf;
407
408 err = uvesafb_exec(task);
409 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
410 pr_warn("VBE state restore call failed (eax=0x%x, err=%d)\n",
411 task->t.regs.eax, err);
412
413 uvesafb_free(task);
414 }
415
416 static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
417 struct uvesafb_par *par)
418 {
419 int err;
420
421 task->t.regs.eax = 0x4f00;
422 task->t.flags = TF_VBEIB;
423 task->t.buf_len = sizeof(struct vbe_ib);
424 task->buf = &par->vbe_ib;
425 strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
426
427 err = uvesafb_exec(task);
428 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
429 pr_err("Getting VBE info block failed (eax=0x%x, err=%d)\n",
430 (u32)task->t.regs.eax, err);
431 return -EINVAL;
432 }
433
434 if (par->vbe_ib.vbe_version < 0x0200) {
435 pr_err("Sorry, pre-VBE 2.0 cards are not supported\n");
436 return -EINVAL;
437 }
438
439 if (!par->vbe_ib.mode_list_ptr) {
440 pr_err("Missing mode list!\n");
441 return -EINVAL;
442 }
443
444 pr_info("");
445
446 /*
447 * Convert string pointers and the mode list pointer into
448 * usable addresses. Print informational messages about the
449 * video adapter and its vendor.
450 */
451 if (par->vbe_ib.oem_vendor_name_ptr)
452 pr_cont("%s, ",
453 ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
454
455 if (par->vbe_ib.oem_product_name_ptr)
456 pr_cont("%s, ",
457 ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
458
459 if (par->vbe_ib.oem_product_rev_ptr)
460 pr_cont("%s, ",
461 ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
462
463 if (par->vbe_ib.oem_string_ptr)
464 pr_cont("OEM: %s, ",
465 ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
466
467 pr_cont("VBE v%d.%d\n",
468 (par->vbe_ib.vbe_version & 0xff00) >> 8,
469 par->vbe_ib.vbe_version & 0xff);
470
471 return 0;
472 }
473
474 static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
475 struct uvesafb_par *par)
476 {
477 int off = 0, err;
478 u16 *mode;
479
480 par->vbe_modes_cnt = 0;
481
482 /* Count available modes. */
483 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
484 while (*mode != 0xffff) {
485 par->vbe_modes_cnt++;
486 mode++;
487 }
488
489 par->vbe_modes = kcalloc(par->vbe_modes_cnt,
490 sizeof(struct vbe_mode_ib),
491 GFP_KERNEL);
492 if (!par->vbe_modes)
493 return -ENOMEM;
494
495 /* Get info about all available modes. */
496 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
497 while (*mode != 0xffff) {
498 struct vbe_mode_ib *mib;
499
500 uvesafb_reset(task);
501 task->t.regs.eax = 0x4f01;
502 task->t.regs.ecx = (u32) *mode;
503 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
504 task->t.buf_len = sizeof(struct vbe_mode_ib);
505 task->buf = par->vbe_modes + off;
506
507 err = uvesafb_exec(task);
508 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
509 pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
510 *mode, (u32)task->t.regs.eax, err);
511 mode++;
512 par->vbe_modes_cnt--;
513 continue;
514 }
515
516 mib = task->buf;
517 mib->mode_id = *mode;
518
519 /*
520 * We only want modes that are supported with the current
521 * hardware configuration, color, graphics and that have
522 * support for the LFB.
523 */
524 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
525 mib->bits_per_pixel >= 8)
526 off++;
527 else
528 par->vbe_modes_cnt--;
529
530 mode++;
531 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
532
533 /*
534 * Handle 8bpp modes and modes with broken color component
535 * lengths.
536 */
537 if (mib->depth == 0 || (mib->depth == 24 &&
538 mib->bits_per_pixel == 32))
539 mib->depth = mib->bits_per_pixel;
540 }
541
542 if (par->vbe_modes_cnt > 0)
543 return 0;
544 else
545 return -EINVAL;
546 }
547
548 /*
549 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
550 * x86 and not x86_64.
551 */
552 #ifdef CONFIG_X86_32
553 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
554 struct uvesafb_par *par)
555 {
556 int i, err;
557
558 uvesafb_reset(task);
559 task->t.regs.eax = 0x4f0a;
560 task->t.regs.ebx = 0x0;
561 err = uvesafb_exec(task);
562
563 if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
564 par->pmi_setpal = par->ypan = 0;
565 } else {
566 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
567 + task->t.regs.edi);
568 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
569 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
570 pr_info("protected mode interface info at %04x:%04x\n",
571 (u16)task->t.regs.es, (u16)task->t.regs.edi);
572 pr_info("pmi: set display start = %p, set palette = %p\n",
573 par->pmi_start, par->pmi_pal);
574
575 if (par->pmi_base[3]) {
576 pr_info("pmi: ports =");
577 for (i = par->pmi_base[3]/2;
578 par->pmi_base[i] != 0xffff; i++)
579 pr_cont(" %x", par->pmi_base[i]);
580 pr_cont("\n");
581
582 if (par->pmi_base[i] != 0xffff) {
583 pr_info("can't handle memory requests, pmi disabled\n");
584 par->ypan = par->pmi_setpal = 0;
585 }
586 }
587 }
588 return 0;
589 }
590 #endif /* CONFIG_X86_32 */
591
592 /*
593 * Check whether a video mode is supported by the Video BIOS and is
594 * compatible with the monitor limits.
595 */
596 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
597 struct fb_info *info)
598 {
599 if (info->monspecs.gtf) {
600 fb_videomode_to_var(&info->var, mode);
601 if (fb_validate_mode(&info->var, info))
602 return 0;
603 }
604
605 if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
606 UVESAFB_EXACT_RES) == -1)
607 return 0;
608
609 return 1;
610 }
611
612 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
613 {
614 struct uvesafb_par *par = info->par;
615 int err = 0;
616
617 if (noedid || par->vbe_ib.vbe_version < 0x0300)
618 return -EINVAL;
619
620 task->t.regs.eax = 0x4f15;
621 task->t.regs.ebx = 0;
622 task->t.regs.ecx = 0;
623 task->t.buf_len = 0;
624 task->t.flags = 0;
625
626 err = uvesafb_exec(task);
627
628 if ((task->t.regs.eax & 0xffff) != 0x004f || err)
629 return -EINVAL;
630
631 if ((task->t.regs.ebx & 0x3) == 3) {
632 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
633 } else if ((task->t.regs.ebx & 0x3) == 2) {
634 pr_info("VBIOS/hardware supports DDC2 transfers\n");
635 } else if ((task->t.regs.ebx & 0x3) == 1) {
636 pr_info("VBIOS/hardware supports DDC1 transfers\n");
637 } else {
638 pr_info("VBIOS/hardware doesn't support DDC transfers\n");
639 return -EINVAL;
640 }
641
642 task->t.regs.eax = 0x4f15;
643 task->t.regs.ebx = 1;
644 task->t.regs.ecx = task->t.regs.edx = 0;
645 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
646 task->t.buf_len = EDID_LENGTH;
647 task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
648 if (!task->buf)
649 return -ENOMEM;
650
651 err = uvesafb_exec(task);
652
653 if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
654 fb_edid_to_monspecs(task->buf, &info->monspecs);
655
656 if (info->monspecs.vfmax && info->monspecs.hfmax) {
657 /*
658 * If the maximum pixel clock wasn't specified in
659 * the EDID block, set it to 300 MHz.
660 */
661 if (info->monspecs.dclkmax == 0)
662 info->monspecs.dclkmax = 300 * 1000000;
663 info->monspecs.gtf = 1;
664 }
665 } else {
666 err = -EINVAL;
667 }
668
669 kfree(task->buf);
670 return err;
671 }
672
673 static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
674 struct fb_info *info)
675 {
676 struct uvesafb_par *par = info->par;
677 int i;
678
679 memset(&info->monspecs, 0, sizeof(info->monspecs));
680
681 /*
682 * If we don't get all necessary data from the EDID block,
683 * mark it as incompatible with the GTF and set nocrtc so
684 * that we always use the default BIOS refresh rate.
685 */
686 if (uvesafb_vbe_getedid(task, info)) {
687 info->monspecs.gtf = 0;
688 par->nocrtc = 1;
689 }
690
691 /* Kernel command line overrides. */
692 if (maxclk)
693 info->monspecs.dclkmax = maxclk * 1000000;
694 if (maxvf)
695 info->monspecs.vfmax = maxvf;
696 if (maxhf)
697 info->monspecs.hfmax = maxhf * 1000;
698
699 /*
700 * In case DDC transfers are not supported, the user can provide
701 * monitor limits manually. Lower limits are set to "safe" values.
702 */
703 if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
704 info->monspecs.dclkmin = 0;
705 info->monspecs.vfmin = 60;
706 info->monspecs.hfmin = 29000;
707 info->monspecs.gtf = 1;
708 par->nocrtc = 0;
709 }
710
711 if (info->monspecs.gtf)
712 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n",
713 info->monspecs.vfmax,
714 (int)(info->monspecs.hfmax / 1000),
715 (int)(info->monspecs.dclkmax / 1000000));
716 else
717 pr_info("no monitor limits have been set, default refresh rate will be used\n");
718
719 /* Add VBE modes to the modelist. */
720 for (i = 0; i < par->vbe_modes_cnt; i++) {
721 struct fb_var_screeninfo var;
722 struct vbe_mode_ib *mode;
723 struct fb_videomode vmode;
724
725 mode = &par->vbe_modes[i];
726 memset(&var, 0, sizeof(var));
727
728 var.xres = mode->x_res;
729 var.yres = mode->y_res;
730
731 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
732 fb_var_to_videomode(&vmode, &var);
733 fb_add_videomode(&vmode, &info->modelist);
734 }
735
736 /* Add valid VESA modes to our modelist. */
737 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
738 if (uvesafb_is_valid_mode((struct fb_videomode *)
739 &vesa_modes[i], info))
740 fb_add_videomode(&vesa_modes[i], &info->modelist);
741 }
742
743 for (i = 0; i < info->monspecs.modedb_len; i++) {
744 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
745 fb_add_videomode(&info->monspecs.modedb[i],
746 &info->modelist);
747 }
748
749 return;
750 }
751
752 static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
753 struct uvesafb_par *par)
754 {
755 int err;
756
757 uvesafb_reset(task);
758
759 /*
760 * Get the VBE state buffer size. We want all available
761 * hardware state data (CL = 0x0f).
762 */
763 task->t.regs.eax = 0x4f04;
764 task->t.regs.ecx = 0x000f;
765 task->t.regs.edx = 0x0000;
766 task->t.flags = 0;
767
768 err = uvesafb_exec(task);
769
770 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
771 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n",
772 task->t.regs.eax, err);
773 par->vbe_state_size = 0;
774 return;
775 }
776
777 par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
778 }
779
780 static int uvesafb_vbe_init(struct fb_info *info)
781 {
782 struct uvesafb_ktask *task = NULL;
783 struct uvesafb_par *par = info->par;
784 int err;
785
786 task = uvesafb_prep();
787 if (!task)
788 return -ENOMEM;
789
790 err = uvesafb_vbe_getinfo(task, par);
791 if (err)
792 goto out;
793
794 err = uvesafb_vbe_getmodes(task, par);
795 if (err)
796 goto out;
797
798 par->nocrtc = nocrtc;
799 #ifdef CONFIG_X86_32
800 par->pmi_setpal = pmi_setpal;
801 par->ypan = ypan;
802
803 if (par->pmi_setpal || par->ypan) {
804 if (__supported_pte_mask & _PAGE_NX) {
805 par->pmi_setpal = par->ypan = 0;
806 pr_warn("NX protection is active, better not use the PMI\n");
807 } else {
808 uvesafb_vbe_getpmi(task, par);
809 }
810 }
811 #else
812 /* The protected mode interface is not available on non-x86. */
813 par->pmi_setpal = par->ypan = 0;
814 #endif
815
816 INIT_LIST_HEAD(&info->modelist);
817 uvesafb_vbe_getmonspecs(task, info);
818 uvesafb_vbe_getstatesize(task, par);
819
820 out: uvesafb_free(task);
821 return err;
822 }
823
824 static int uvesafb_vbe_init_mode(struct fb_info *info)
825 {
826 struct list_head *pos;
827 struct fb_modelist *modelist;
828 struct fb_videomode *mode;
829 struct uvesafb_par *par = info->par;
830 int i, modeid;
831
832 /* Has the user requested a specific VESA mode? */
833 if (vbemode) {
834 for (i = 0; i < par->vbe_modes_cnt; i++) {
835 if (par->vbe_modes[i].mode_id == vbemode) {
836 modeid = i;
837 uvesafb_setup_var(&info->var, info,
838 &par->vbe_modes[modeid]);
839 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
840 &info->var, info);
841 /*
842 * With pixclock set to 0, the default BIOS
843 * timings will be used in set_par().
844 */
845 info->var.pixclock = 0;
846 goto gotmode;
847 }
848 }
849 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode);
850 vbemode = 0;
851 }
852
853 /* Count the modes in the modelist */
854 i = 0;
855 list_for_each(pos, &info->modelist)
856 i++;
857
858 /*
859 * Convert the modelist into a modedb so that we can use it with
860 * fb_find_mode().
861 */
862 mode = kcalloc(i, sizeof(*mode), GFP_KERNEL);
863 if (mode) {
864 i = 0;
865 list_for_each(pos, &info->modelist) {
866 modelist = list_entry(pos, struct fb_modelist, list);
867 mode[i] = modelist->mode;
868 i++;
869 }
870
871 if (!mode_option)
872 mode_option = UVESAFB_DEFAULT_MODE;
873
874 i = fb_find_mode(&info->var, info, mode_option, mode, i,
875 NULL, 8);
876
877 kfree(mode);
878 }
879
880 /* fb_find_mode() failed */
881 if (i == 0) {
882 info->var.xres = 640;
883 info->var.yres = 480;
884 mode = (struct fb_videomode *)
885 fb_find_best_mode(&info->var, &info->modelist);
886
887 if (mode) {
888 fb_videomode_to_var(&info->var, mode);
889 } else {
890 modeid = par->vbe_modes[0].mode_id;
891 uvesafb_setup_var(&info->var, info,
892 &par->vbe_modes[modeid]);
893 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
894 &info->var, info);
895
896 goto gotmode;
897 }
898 }
899
900 /* Look for a matching VBE mode. */
901 modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
902 info->var.bits_per_pixel, UVESAFB_EXACT_RES);
903
904 if (modeid == -1)
905 return -EINVAL;
906
907 uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
908
909 gotmode:
910 /*
911 * If we are not VBE3.0+ compliant, we're done -- the BIOS will
912 * ignore our timings anyway.
913 */
914 if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
915 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
916 &info->var, info);
917
918 return modeid;
919 }
920
921 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
922 int start, struct fb_info *info)
923 {
924 struct uvesafb_ktask *task;
925 #ifdef CONFIG_X86
926 struct uvesafb_par *par = info->par;
927 int i = par->mode_idx;
928 #endif
929 int err = 0;
930
931 /*
932 * We support palette modifications for 8 bpp modes only, so
933 * there can never be more than 256 entries.
934 */
935 if (start + count > 256)
936 return -EINVAL;
937
938 #ifdef CONFIG_X86
939 /* Use VGA registers if mode is VGA-compatible. */
940 if (i >= 0 && i < par->vbe_modes_cnt &&
941 par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
942 for (i = 0; i < count; i++) {
943 outb_p(start + i, dac_reg);
944 outb_p(entries[i].red, dac_val);
945 outb_p(entries[i].green, dac_val);
946 outb_p(entries[i].blue, dac_val);
947 }
948 }
949 #ifdef CONFIG_X86_32
950 else if (par->pmi_setpal) {
951 __asm__ __volatile__(
952 "call *(%%esi)"
953 : /* no return value */
954 : "a" (0x4f09), /* EAX */
955 "b" (0), /* EBX */
956 "c" (count), /* ECX */
957 "d" (start), /* EDX */
958 "D" (entries), /* EDI */
959 "S" (&par->pmi_pal)); /* ESI */
960 }
961 #endif /* CONFIG_X86_32 */
962 else
963 #endif /* CONFIG_X86 */
964 {
965 task = uvesafb_prep();
966 if (!task)
967 return -ENOMEM;
968
969 task->t.regs.eax = 0x4f09;
970 task->t.regs.ebx = 0x0;
971 task->t.regs.ecx = count;
972 task->t.regs.edx = start;
973 task->t.flags = TF_BUF_ESDI;
974 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
975 task->buf = entries;
976
977 err = uvesafb_exec(task);
978 if ((task->t.regs.eax & 0xffff) != 0x004f)
979 err = 1;
980
981 uvesafb_free(task);
982 }
983 return err;
984 }
985
986 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
987 unsigned blue, unsigned transp,
988 struct fb_info *info)
989 {
990 struct uvesafb_pal_entry entry;
991 int shift = 16 - dac_width;
992 int err = 0;
993
994 if (regno >= info->cmap.len)
995 return -EINVAL;
996
997 if (info->var.bits_per_pixel == 8) {
998 entry.red = red >> shift;
999 entry.green = green >> shift;
1000 entry.blue = blue >> shift;
1001 entry.pad = 0;
1002
1003 err = uvesafb_setpalette(&entry, 1, regno, info);
1004 } else if (regno < 16) {
1005 switch (info->var.bits_per_pixel) {
1006 case 16:
1007 if (info->var.red.offset == 10) {
1008 /* 1:5:5:5 */
1009 ((u32 *) (info->pseudo_palette))[regno] =
1010 ((red & 0xf800) >> 1) |
1011 ((green & 0xf800) >> 6) |
1012 ((blue & 0xf800) >> 11);
1013 } else {
1014 /* 0:5:6:5 */
1015 ((u32 *) (info->pseudo_palette))[regno] =
1016 ((red & 0xf800) ) |
1017 ((green & 0xfc00) >> 5) |
1018 ((blue & 0xf800) >> 11);
1019 }
1020 break;
1021
1022 case 24:
1023 case 32:
1024 red >>= 8;
1025 green >>= 8;
1026 blue >>= 8;
1027 ((u32 *)(info->pseudo_palette))[regno] =
1028 (red << info->var.red.offset) |
1029 (green << info->var.green.offset) |
1030 (blue << info->var.blue.offset);
1031 break;
1032 }
1033 }
1034 return err;
1035 }
1036
1037 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1038 {
1039 struct uvesafb_pal_entry *entries;
1040 int shift = 16 - dac_width;
1041 int i, err = 0;
1042
1043 if (info->var.bits_per_pixel == 8) {
1044 if (cmap->start + cmap->len > info->cmap.start +
1045 info->cmap.len || cmap->start < info->cmap.start)
1046 return -EINVAL;
1047
1048 entries = kmalloc_array(cmap->len, sizeof(*entries),
1049 GFP_KERNEL);
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
1076 static 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
1103 static 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;
1157 out: uvesafb_free(task);
1158 }
1159 return err;
1160 }
1161
1162 static 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
1182 static 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);
1207 out:
1208 atomic_dec(&par->ref_count);
1209 uvesafb_free(task);
1210 return 0;
1211 }
1212
1213 static 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;
1235 setmode:
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(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
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
1319 out:
1320 kfree(crtc);
1321 uvesafb_free(task);
1322
1323 return err;
1324 }
1325
1326 static 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
1362 static 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
1412 static struct fb_ops uvesafb_ops = {
1413 .owner = THIS_MODULE,
1414 .fb_open = uvesafb_open,
1415 .fb_release = uvesafb_release,
1416 .fb_setcolreg = uvesafb_setcolreg,
1417 .fb_setcmap = uvesafb_setcmap,
1418 .fb_pan_display = uvesafb_pan_display,
1419 .fb_blank = uvesafb_blank,
1420 .fb_fillrect = cfb_fillrect,
1421 .fb_copyarea = cfb_copyarea,
1422 .fb_imageblit = cfb_imageblit,
1423 .fb_check_var = uvesafb_check_var,
1424 .fb_set_par = uvesafb_set_par,
1425 };
1426
1427 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1428 {
1429 unsigned int size_vmode;
1430 unsigned int size_remap;
1431 unsigned int size_total;
1432 struct uvesafb_par *par = info->par;
1433 int i, h;
1434
1435 info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1436 info->fix = uvesafb_fix;
1437 info->fix.ypanstep = par->ypan ? 1 : 0;
1438 info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1439
1440 /* Disable blanking if the user requested so. */
1441 if (!blank)
1442 info->fbops->fb_blank = NULL;
1443
1444 /*
1445 * Find out how much IO memory is required for the mode with
1446 * the highest resolution.
1447 */
1448 size_remap = 0;
1449 for (i = 0; i < par->vbe_modes_cnt; i++) {
1450 h = par->vbe_modes[i].bytes_per_scan_line *
1451 par->vbe_modes[i].y_res;
1452 if (h > size_remap)
1453 size_remap = h;
1454 }
1455 size_remap *= 2;
1456
1457 /*
1458 * size_vmode -- that is the amount of memory needed for the
1459 * used video mode, i.e. the minimum amount of
1460 * memory we need.
1461 */
1462 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1463
1464 /*
1465 * size_total -- all video memory we have. Used for mtrr
1466 * entries, resource allocation and bounds
1467 * checking.
1468 */
1469 size_total = par->vbe_ib.total_memory * 65536;
1470 if (vram_total)
1471 size_total = vram_total * 1024 * 1024;
1472 if (size_total < size_vmode)
1473 size_total = size_vmode;
1474
1475 /*
1476 * size_remap -- the amount of video memory we are going to
1477 * use for vesafb. With modern cards it is no
1478 * option to simply use size_total as th
1479 * wastes plenty of kernel address space.
1480 */
1481 if (vram_remap)
1482 size_remap = vram_remap * 1024 * 1024;
1483 if (size_remap < size_vmode)
1484 size_remap = size_vmode;
1485 if (size_remap > size_total)
1486 size_remap = size_total;
1487
1488 info->fix.smem_len = size_remap;
1489 info->fix.smem_start = mode->phys_base_ptr;
1490
1491 /*
1492 * We have to set yres_virtual here because when setup_var() was
1493 * called, smem_len wasn't defined yet.
1494 */
1495 info->var.yres_virtual = info->fix.smem_len /
1496 mode->bytes_per_scan_line;
1497
1498 if (par->ypan && info->var.yres_virtual > info->var.yres) {
1499 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1500 (par->ypan > 1) ? "ywrap" : "ypan",
1501 info->var.yres_virtual);
1502 } else {
1503 pr_info("scrolling: redraw\n");
1504 info->var.yres_virtual = info->var.yres;
1505 par->ypan = 0;
1506 }
1507
1508 info->flags = FBINFO_FLAG_DEFAULT |
1509 (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1510
1511 if (!par->ypan)
1512 info->fbops->fb_pan_display = NULL;
1513 }
1514
1515 static void uvesafb_init_mtrr(struct fb_info *info)
1516 {
1517 struct uvesafb_par *par = info->par;
1518
1519 if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1520 int temp_size = info->fix.smem_len;
1521
1522 int rc;
1523
1524 /* Find the largest power-of-two */
1525 temp_size = roundup_pow_of_two(temp_size);
1526
1527 /* Try and find a power of two to add */
1528 do {
1529 rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1530 temp_size >>= 1;
1531 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1532
1533 if (rc >= 0)
1534 par->mtrr_handle = rc;
1535 }
1536 }
1537
1538 static void uvesafb_ioremap(struct fb_info *info)
1539 {
1540 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1541 }
1542
1543 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1544 struct device_attribute *attr, char *buf)
1545 {
1546 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1547 struct uvesafb_par *par = info->par;
1548
1549 return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1550 }
1551
1552 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1553
1554 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1555 struct device_attribute *attr, char *buf)
1556 {
1557 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1558 struct uvesafb_par *par = info->par;
1559 int ret = 0, i;
1560
1561 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1562 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1563 "%dx%d-%d, 0x%.4x\n",
1564 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1565 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1566 }
1567
1568 return ret;
1569 }
1570
1571 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1572
1573 static ssize_t uvesafb_show_vendor(struct device *dev,
1574 struct device_attribute *attr, char *buf)
1575 {
1576 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1577 struct uvesafb_par *par = info->par;
1578
1579 if (par->vbe_ib.oem_vendor_name_ptr)
1580 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1581 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1582 else
1583 return 0;
1584 }
1585
1586 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1587
1588 static ssize_t uvesafb_show_product_name(struct device *dev,
1589 struct device_attribute *attr, char *buf)
1590 {
1591 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1592 struct uvesafb_par *par = info->par;
1593
1594 if (par->vbe_ib.oem_product_name_ptr)
1595 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1596 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1597 else
1598 return 0;
1599 }
1600
1601 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1602
1603 static ssize_t uvesafb_show_product_rev(struct device *dev,
1604 struct device_attribute *attr, char *buf)
1605 {
1606 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1607 struct uvesafb_par *par = info->par;
1608
1609 if (par->vbe_ib.oem_product_rev_ptr)
1610 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1611 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1612 else
1613 return 0;
1614 }
1615
1616 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1617
1618 static ssize_t uvesafb_show_oem_string(struct device *dev,
1619 struct device_attribute *attr, char *buf)
1620 {
1621 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1622 struct uvesafb_par *par = info->par;
1623
1624 if (par->vbe_ib.oem_string_ptr)
1625 return snprintf(buf, PAGE_SIZE, "%s\n",
1626 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1627 else
1628 return 0;
1629 }
1630
1631 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1632
1633 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1634 struct device_attribute *attr, char *buf)
1635 {
1636 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1637 struct uvesafb_par *par = info->par;
1638
1639 return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1640 }
1641
1642 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1643 struct device_attribute *attr, const char *buf, size_t count)
1644 {
1645 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1646 struct uvesafb_par *par = info->par;
1647
1648 if (count > 0) {
1649 if (buf[0] == '0')
1650 par->nocrtc = 0;
1651 else
1652 par->nocrtc = 1;
1653 }
1654 return count;
1655 }
1656
1657 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1658 uvesafb_store_nocrtc);
1659
1660 static struct attribute *uvesafb_dev_attrs[] = {
1661 &dev_attr_vbe_version.attr,
1662 &dev_attr_vbe_modes.attr,
1663 &dev_attr_oem_vendor.attr,
1664 &dev_attr_oem_product_name.attr,
1665 &dev_attr_oem_product_rev.attr,
1666 &dev_attr_oem_string.attr,
1667 &dev_attr_nocrtc.attr,
1668 NULL,
1669 };
1670
1671 static const struct attribute_group uvesafb_dev_attgrp = {
1672 .name = NULL,
1673 .attrs = uvesafb_dev_attrs,
1674 };
1675
1676 static int uvesafb_probe(struct platform_device *dev)
1677 {
1678 struct fb_info *info;
1679 struct vbe_mode_ib *mode = NULL;
1680 struct uvesafb_par *par;
1681 int err = 0, i;
1682
1683 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1684 if (!info)
1685 return -ENOMEM;
1686
1687 par = info->par;
1688
1689 err = uvesafb_vbe_init(info);
1690 if (err) {
1691 pr_err("vbe_init() failed with %d\n", err);
1692 goto out;
1693 }
1694
1695 info->fbops = &uvesafb_ops;
1696
1697 i = uvesafb_vbe_init_mode(info);
1698 if (i < 0) {
1699 err = -EINVAL;
1700 goto out;
1701 } else {
1702 mode = &par->vbe_modes[i];
1703 }
1704
1705 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1706 err = -ENXIO;
1707 goto out;
1708 }
1709
1710 uvesafb_init_info(info, mode);
1711
1712 if (!request_region(0x3c0, 32, "uvesafb")) {
1713 pr_err("request region 0x3c0-0x3e0 failed\n");
1714 err = -EIO;
1715 goto out_mode;
1716 }
1717
1718 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1719 "uvesafb")) {
1720 pr_err("cannot reserve video memory at 0x%lx\n",
1721 info->fix.smem_start);
1722 err = -EIO;
1723 goto out_reg;
1724 }
1725
1726 uvesafb_init_mtrr(info);
1727 uvesafb_ioremap(info);
1728
1729 if (!info->screen_base) {
1730 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1731 info->fix.smem_len, info->fix.smem_start);
1732 err = -EIO;
1733 goto out_mem;
1734 }
1735
1736 platform_set_drvdata(dev, info);
1737
1738 if (register_framebuffer(info) < 0) {
1739 pr_err("failed to register framebuffer device\n");
1740 err = -EINVAL;
1741 goto out_unmap;
1742 }
1743
1744 pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1745 info->fix.smem_start, info->screen_base,
1746 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1747 fb_info(info, "%s frame buffer device\n", info->fix.id);
1748
1749 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1750 if (err != 0)
1751 fb_warn(info, "failed to register attributes\n");
1752
1753 return 0;
1754
1755 out_unmap:
1756 iounmap(info->screen_base);
1757 out_mem:
1758 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1759 out_reg:
1760 release_region(0x3c0, 32);
1761 out_mode:
1762 if (!list_empty(&info->modelist))
1763 fb_destroy_modelist(&info->modelist);
1764 fb_destroy_modedb(info->monspecs.modedb);
1765 fb_dealloc_cmap(&info->cmap);
1766 out:
1767 kfree(par->vbe_modes);
1768
1769 framebuffer_release(info);
1770 return err;
1771 }
1772
1773 static int uvesafb_remove(struct platform_device *dev)
1774 {
1775 struct fb_info *info = platform_get_drvdata(dev);
1776
1777 if (info) {
1778 struct uvesafb_par *par = info->par;
1779
1780 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1781 unregister_framebuffer(info);
1782 release_region(0x3c0, 32);
1783 iounmap(info->screen_base);
1784 arch_phys_wc_del(par->mtrr_handle);
1785 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1786 fb_destroy_modedb(info->monspecs.modedb);
1787 fb_dealloc_cmap(&info->cmap);
1788
1789 kfree(par->vbe_modes);
1790 kfree(par->vbe_state_orig);
1791 kfree(par->vbe_state_saved);
1792
1793 framebuffer_release(info);
1794 }
1795 return 0;
1796 }
1797
1798 static struct platform_driver uvesafb_driver = {
1799 .probe = uvesafb_probe,
1800 .remove = uvesafb_remove,
1801 .driver = {
1802 .name = "uvesafb",
1803 },
1804 };
1805
1806 static struct platform_device *uvesafb_device;
1807
1808 #ifndef MODULE
1809 static int uvesafb_setup(char *options)
1810 {
1811 char *this_opt;
1812
1813 if (!options || !*options)
1814 return 0;
1815
1816 while ((this_opt = strsep(&options, ",")) != NULL) {
1817 if (!*this_opt) continue;
1818
1819 if (!strcmp(this_opt, "redraw"))
1820 ypan = 0;
1821 else if (!strcmp(this_opt, "ypan"))
1822 ypan = 1;
1823 else if (!strcmp(this_opt, "ywrap"))
1824 ypan = 2;
1825 else if (!strcmp(this_opt, "vgapal"))
1826 pmi_setpal = 0;
1827 else if (!strcmp(this_opt, "pmipal"))
1828 pmi_setpal = 1;
1829 else if (!strncmp(this_opt, "mtrr:", 5))
1830 mtrr = simple_strtoul(this_opt+5, NULL, 0);
1831 else if (!strcmp(this_opt, "nomtrr"))
1832 mtrr = 0;
1833 else if (!strcmp(this_opt, "nocrtc"))
1834 nocrtc = 1;
1835 else if (!strcmp(this_opt, "noedid"))
1836 noedid = 1;
1837 else if (!strcmp(this_opt, "noblank"))
1838 blank = 0;
1839 else if (!strncmp(this_opt, "vtotal:", 7))
1840 vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1841 else if (!strncmp(this_opt, "vremap:", 7))
1842 vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1843 else if (!strncmp(this_opt, "maxhf:", 6))
1844 maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1845 else if (!strncmp(this_opt, "maxvf:", 6))
1846 maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1847 else if (!strncmp(this_opt, "maxclk:", 7))
1848 maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1849 else if (!strncmp(this_opt, "vbemode:", 8))
1850 vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1851 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1852 mode_option = this_opt;
1853 } else {
1854 pr_warn("unrecognized option %s\n", this_opt);
1855 }
1856 }
1857
1858 if (mtrr != 3 && mtrr != 0)
1859 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1860
1861 return 0;
1862 }
1863 #endif /* !MODULE */
1864
1865 static ssize_t v86d_show(struct device_driver *dev, char *buf)
1866 {
1867 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1868 }
1869
1870 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1871 size_t count)
1872 {
1873 strncpy(v86d_path, buf, PATH_MAX);
1874 return count;
1875 }
1876 static DRIVER_ATTR_RW(v86d);
1877
1878 static int uvesafb_init(void)
1879 {
1880 int err;
1881
1882 #ifndef MODULE
1883 char *option = NULL;
1884
1885 if (fb_get_options("uvesafb", &option))
1886 return -ENODEV;
1887 uvesafb_setup(option);
1888 #endif
1889 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1890 if (err)
1891 return err;
1892
1893 err = platform_driver_register(&uvesafb_driver);
1894
1895 if (!err) {
1896 uvesafb_device = platform_device_alloc("uvesafb", 0);
1897 if (uvesafb_device)
1898 err = platform_device_add(uvesafb_device);
1899 else
1900 err = -ENOMEM;
1901
1902 if (err) {
1903 platform_device_put(uvesafb_device);
1904 platform_driver_unregister(&uvesafb_driver);
1905 cn_del_callback(&uvesafb_cn_id);
1906 return err;
1907 }
1908
1909 err = driver_create_file(&uvesafb_driver.driver,
1910 &driver_attr_v86d);
1911 if (err) {
1912 pr_warn("failed to register attributes\n");
1913 err = 0;
1914 }
1915 }
1916 return err;
1917 }
1918
1919 module_init(uvesafb_init);
1920
1921 static void uvesafb_exit(void)
1922 {
1923 struct uvesafb_ktask *task;
1924
1925 if (v86d_started) {
1926 task = uvesafb_prep();
1927 if (task) {
1928 task->t.flags = TF_EXIT;
1929 uvesafb_exec(task);
1930 uvesafb_free(task);
1931 }
1932 }
1933
1934 cn_del_callback(&uvesafb_cn_id);
1935 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1936 platform_device_unregister(uvesafb_device);
1937 platform_driver_unregister(&uvesafb_driver);
1938 }
1939
1940 module_exit(uvesafb_exit);
1941
1942 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1943 {
1944 ypan = 0;
1945
1946 if (!strcmp(val, "redraw"))
1947 ypan = 0;
1948 else if (!strcmp(val, "ypan"))
1949 ypan = 1;
1950 else if (!strcmp(val, "ywrap"))
1951 ypan = 2;
1952 else
1953 return -EINVAL;
1954
1955 return 0;
1956 }
1957 static const struct kernel_param_ops param_ops_scroll = {
1958 .set = param_set_scroll,
1959 };
1960 #define param_check_scroll(name, p) __param_check(name, p, void)
1961
1962 module_param_named(scroll, ypan, scroll, 0);
1963 MODULE_PARM_DESC(scroll,
1964 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1965 module_param_named(vgapal, pmi_setpal, invbool, 0);
1966 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1967 module_param_named(pmipal, pmi_setpal, bool, 0);
1968 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1969 module_param(mtrr, uint, 0);
1970 MODULE_PARM_DESC(mtrr,
1971 "Memory Type Range Registers setting. Use 0 to disable.");
1972 module_param(blank, bool, 0);
1973 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1974 module_param(nocrtc, bool, 0);
1975 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1976 module_param(noedid, bool, 0);
1977 MODULE_PARM_DESC(noedid,
1978 "Ignore EDID-provided monitor limits when setting modes");
1979 module_param(vram_remap, uint, 0);
1980 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1981 module_param(vram_total, uint, 0);
1982 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
1983 module_param(maxclk, ushort, 0);
1984 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1985 module_param(maxhf, ushort, 0);
1986 MODULE_PARM_DESC(maxhf,
1987 "Maximum horizontal frequency [kHz], overrides EDID data");
1988 module_param(maxvf, ushort, 0);
1989 MODULE_PARM_DESC(maxvf,
1990 "Maximum vertical frequency [Hz], overrides EDID data");
1991 module_param(mode_option, charp, 0);
1992 MODULE_PARM_DESC(mode_option,
1993 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1994 module_param(vbemode, ushort, 0);
1995 MODULE_PARM_DESC(vbemode,
1996 "VBE mode number to set, overrides the 'mode' option");
1997 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
1998 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
1999
2000 MODULE_LICENSE("GPL");
2001 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2002 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2003
Linux with added FPC-III support