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Linux 4.16.11
[linux/fpc-iii.git] / drivers / video / fbdev / uvesafb.c
blob73676eb0244a7bd63d294619563d723992a93183
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 = kzalloc(sizeof(struct vbe_mode_ib) *
490 par->vbe_modes_cnt, GFP_KERNEL);
491 if (!par->vbe_modes)
492 return -ENOMEM;
493
494 /* Get info about all available modes. */
495 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
496 while (*mode != 0xffff) {
497 struct vbe_mode_ib *mib;
498
499 uvesafb_reset(task);
500 task->t.regs.eax = 0x4f01;
501 task->t.regs.ecx = (u32) *mode;
502 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
503 task->t.buf_len = sizeof(struct vbe_mode_ib);
504 task->buf = par->vbe_modes + off;
505
506 err = uvesafb_exec(task);
507 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
508 pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
509 *mode, (u32)task->t.regs.eax, err);
510 mode++;
511 par->vbe_modes_cnt--;
512 continue;
513 }
514
515 mib = task->buf;
516 mib->mode_id = *mode;
517
518 /*
519 * We only want modes that are supported with the current
520 * hardware configuration, color, graphics and that have
521 * support for the LFB.
522 */
523 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
524 mib->bits_per_pixel >= 8)
525 off++;
526 else
527 par->vbe_modes_cnt--;
528
529 mode++;
530 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
531
532 /*
533 * Handle 8bpp modes and modes with broken color component
534 * lengths.
535 */
536 if (mib->depth == 0 || (mib->depth == 24 &&
537 mib->bits_per_pixel == 32))
538 mib->depth = mib->bits_per_pixel;
539 }
540
541 if (par->vbe_modes_cnt > 0)
542 return 0;
543 else
544 return -EINVAL;
545 }
546
547 /*
548 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
549 * x86 and not x86_64.
550 */
551 #ifdef CONFIG_X86_32
552 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
553 struct uvesafb_par *par)
554 {
555 int i, err;
556
557 uvesafb_reset(task);
558 task->t.regs.eax = 0x4f0a;
559 task->t.regs.ebx = 0x0;
560 err = uvesafb_exec(task);
561
562 if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
563 par->pmi_setpal = par->ypan = 0;
564 } else {
565 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
566 + task->t.regs.edi);
567 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
568 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
569 pr_info("protected mode interface info at %04x:%04x\n",
570 (u16)task->t.regs.es, (u16)task->t.regs.edi);
571 pr_info("pmi: set display start = %p, set palette = %p\n",
572 par->pmi_start, par->pmi_pal);
573
574 if (par->pmi_base[3]) {
575 pr_info("pmi: ports =");
576 for (i = par->pmi_base[3]/2;
577 par->pmi_base[i] != 0xffff; i++)
578 pr_cont(" %x", par->pmi_base[i]);
579 pr_cont("\n");
580
581 if (par->pmi_base[i] != 0xffff) {
582 pr_info("can't handle memory requests, pmi disabled\n");
583 par->ypan = par->pmi_setpal = 0;
584 }
585 }
586 }
587 return 0;
588 }
589 #endif /* CONFIG_X86_32 */
590
591 /*
592 * Check whether a video mode is supported by the Video BIOS and is
593 * compatible with the monitor limits.
594 */
595 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
596 struct fb_info *info)
597 {
598 if (info->monspecs.gtf) {
599 fb_videomode_to_var(&info->var, mode);
600 if (fb_validate_mode(&info->var, info))
601 return 0;
602 }
603
604 if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
605 UVESAFB_EXACT_RES) == -1)
606 return 0;
607
608 return 1;
609 }
610
611 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
612 {
613 struct uvesafb_par *par = info->par;
614 int err = 0;
615
616 if (noedid || par->vbe_ib.vbe_version < 0x0300)
617 return -EINVAL;
618
619 task->t.regs.eax = 0x4f15;
620 task->t.regs.ebx = 0;
621 task->t.regs.ecx = 0;
622 task->t.buf_len = 0;
623 task->t.flags = 0;
624
625 err = uvesafb_exec(task);
626
627 if ((task->t.regs.eax & 0xffff) != 0x004f || err)
628 return -EINVAL;
629
630 if ((task->t.regs.ebx & 0x3) == 3) {
631 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
632 } else if ((task->t.regs.ebx & 0x3) == 2) {
633 pr_info("VBIOS/hardware supports DDC2 transfers\n");
634 } else if ((task->t.regs.ebx & 0x3) == 1) {
635 pr_info("VBIOS/hardware supports DDC1 transfers\n");
636 } else {
637 pr_info("VBIOS/hardware doesn't support DDC transfers\n");
638 return -EINVAL;
639 }
640
641 task->t.regs.eax = 0x4f15;
642 task->t.regs.ebx = 1;
643 task->t.regs.ecx = task->t.regs.edx = 0;
644 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
645 task->t.buf_len = EDID_LENGTH;
646 task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
647 if (!task->buf)
648 return -ENOMEM;
649
650 err = uvesafb_exec(task);
651
652 if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
653 fb_edid_to_monspecs(task->buf, &info->monspecs);
654
655 if (info->monspecs.vfmax && info->monspecs.hfmax) {
656 /*
657 * If the maximum pixel clock wasn't specified in
658 * the EDID block, set it to 300 MHz.
659 */
660 if (info->monspecs.dclkmax == 0)
661 info->monspecs.dclkmax = 300 * 1000000;
662 info->monspecs.gtf = 1;
663 }
664 } else {
665 err = -EINVAL;
666 }
667
668 kfree(task->buf);
669 return err;
670 }
671
672 static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
673 struct fb_info *info)
674 {
675 struct uvesafb_par *par = info->par;
676 int i;
677
678 memset(&info->monspecs, 0, sizeof(info->monspecs));
679
680 /*
681 * If we don't get all necessary data from the EDID block,
682 * mark it as incompatible with the GTF and set nocrtc so
683 * that we always use the default BIOS refresh rate.
684 */
685 if (uvesafb_vbe_getedid(task, info)) {
686 info->monspecs.gtf = 0;
687 par->nocrtc = 1;
688 }
689
690 /* Kernel command line overrides. */
691 if (maxclk)
692 info->monspecs.dclkmax = maxclk * 1000000;
693 if (maxvf)
694 info->monspecs.vfmax = maxvf;
695 if (maxhf)
696 info->monspecs.hfmax = maxhf * 1000;
697
698 /*
699 * In case DDC transfers are not supported, the user can provide
700 * monitor limits manually. Lower limits are set to "safe" values.
701 */
702 if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
703 info->monspecs.dclkmin = 0;
704 info->monspecs.vfmin = 60;
705 info->monspecs.hfmin = 29000;
706 info->monspecs.gtf = 1;
707 par->nocrtc = 0;
708 }
709
710 if (info->monspecs.gtf)
711 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n",
712 info->monspecs.vfmax,
713 (int)(info->monspecs.hfmax / 1000),
714 (int)(info->monspecs.dclkmax / 1000000));
715 else
716 pr_info("no monitor limits have been set, default refresh rate will be used\n");
717
718 /* Add VBE modes to the modelist. */
719 for (i = 0; i < par->vbe_modes_cnt; i++) {
720 struct fb_var_screeninfo var;
721 struct vbe_mode_ib *mode;
722 struct fb_videomode vmode;
723
724 mode = &par->vbe_modes[i];
725 memset(&var, 0, sizeof(var));
726
727 var.xres = mode->x_res;
728 var.yres = mode->y_res;
729
730 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
731 fb_var_to_videomode(&vmode, &var);
732 fb_add_videomode(&vmode, &info->modelist);
733 }
734
735 /* Add valid VESA modes to our modelist. */
736 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
737 if (uvesafb_is_valid_mode((struct fb_videomode *)
738 &vesa_modes[i], info))
739 fb_add_videomode(&vesa_modes[i], &info->modelist);
740 }
741
742 for (i = 0; i < info->monspecs.modedb_len; i++) {
743 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
744 fb_add_videomode(&info->monspecs.modedb[i],
745 &info->modelist);
746 }
747
748 return;
749 }
750
751 static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
752 struct uvesafb_par *par)
753 {
754 int err;
755
756 uvesafb_reset(task);
757
758 /*
759 * Get the VBE state buffer size. We want all available
760 * hardware state data (CL = 0x0f).
761 */
762 task->t.regs.eax = 0x4f04;
763 task->t.regs.ecx = 0x000f;
764 task->t.regs.edx = 0x0000;
765 task->t.flags = 0;
766
767 err = uvesafb_exec(task);
768
769 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
770 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n",
771 task->t.regs.eax, err);
772 par->vbe_state_size = 0;
773 return;
774 }
775
776 par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
777 }
778
779 static int uvesafb_vbe_init(struct fb_info *info)
780 {
781 struct uvesafb_ktask *task = NULL;
782 struct uvesafb_par *par = info->par;
783 int err;
784
785 task = uvesafb_prep();
786 if (!task)
787 return -ENOMEM;
788
789 err = uvesafb_vbe_getinfo(task, par);
790 if (err)
791 goto out;
792
793 err = uvesafb_vbe_getmodes(task, par);
794 if (err)
795 goto out;
796
797 par->nocrtc = nocrtc;
798 #ifdef CONFIG_X86_32
799 par->pmi_setpal = pmi_setpal;
800 par->ypan = ypan;
801
802 if (par->pmi_setpal || par->ypan) {
803 if (__supported_pte_mask & _PAGE_NX) {
804 par->pmi_setpal = par->ypan = 0;
805 pr_warn("NX protection is active, better not use the PMI\n");
806 } else {
807 uvesafb_vbe_getpmi(task, par);
808 }
809 }
810 #else
811 /* The protected mode interface is not available on non-x86. */
812 par->pmi_setpal = par->ypan = 0;
813 #endif
814
815 INIT_LIST_HEAD(&info->modelist);
816 uvesafb_vbe_getmonspecs(task, info);
817 uvesafb_vbe_getstatesize(task, par);
818
819 out: uvesafb_free(task);
820 return err;
821 }
822
823 static int uvesafb_vbe_init_mode(struct fb_info *info)
824 {
825 struct list_head *pos;
826 struct fb_modelist *modelist;
827 struct fb_videomode *mode;
828 struct uvesafb_par *par = info->par;
829 int i, modeid;
830
831 /* Has the user requested a specific VESA mode? */
832 if (vbemode) {
833 for (i = 0; i < par->vbe_modes_cnt; i++) {
834 if (par->vbe_modes[i].mode_id == vbemode) {
835 modeid = i;
836 uvesafb_setup_var(&info->var, info,
837 &par->vbe_modes[modeid]);
838 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
839 &info->var, info);
840 /*
841 * With pixclock set to 0, the default BIOS
842 * timings will be used in set_par().
843 */
844 info->var.pixclock = 0;
845 goto gotmode;
846 }
847 }
848 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode);
849 vbemode = 0;
850 }
851
852 /* Count the modes in the modelist */
853 i = 0;
854 list_for_each(pos, &info->modelist)
855 i++;
856
857 /*
858 * Convert the modelist into a modedb so that we can use it with
859 * fb_find_mode().
860 */
861 mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
862 if (mode) {
863 i = 0;
864 list_for_each(pos, &info->modelist) {
865 modelist = list_entry(pos, struct fb_modelist, list);
866 mode[i] = modelist->mode;
867 i++;
868 }
869
870 if (!mode_option)
871 mode_option = UVESAFB_DEFAULT_MODE;
872
873 i = fb_find_mode(&info->var, info, mode_option, mode, i,
874 NULL, 8);
875
876 kfree(mode);
877 }
878
879 /* fb_find_mode() failed */
880 if (i == 0) {
881 info->var.xres = 640;
882 info->var.yres = 480;
883 mode = (struct fb_videomode *)
884 fb_find_best_mode(&info->var, &info->modelist);
885
886 if (mode) {
887 fb_videomode_to_var(&info->var, mode);
888 } else {
889 modeid = par->vbe_modes[0].mode_id;
890 uvesafb_setup_var(&info->var, info,
891 &par->vbe_modes[modeid]);
892 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
893 &info->var, info);
894
895 goto gotmode;
896 }
897 }
898
899 /* Look for a matching VBE mode. */
900 modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
901 info->var.bits_per_pixel, UVESAFB_EXACT_RES);
902
903 if (modeid == -1)
904 return -EINVAL;
905
906 uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
907
908 gotmode:
909 /*
910 * If we are not VBE3.0+ compliant, we're done -- the BIOS will
911 * ignore our timings anyway.
912 */
913 if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
914 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
915 &info->var, info);
916
917 return modeid;
918 }
919
920 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
921 int start, struct fb_info *info)
922 {
923 struct uvesafb_ktask *task;
924 #ifdef CONFIG_X86
925 struct uvesafb_par *par = info->par;
926 int i = par->mode_idx;
927 #endif
928 int err = 0;
929
930 /*
931 * We support palette modifications for 8 bpp modes only, so
932 * there can never be more than 256 entries.
933 */
934 if (start + count > 256)
935 return -EINVAL;
936
937 #ifdef CONFIG_X86
938 /* Use VGA registers if mode is VGA-compatible. */
939 if (i >= 0 && i < par->vbe_modes_cnt &&
940 par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
941 for (i = 0; i < count; i++) {
942 outb_p(start + i, dac_reg);
943 outb_p(entries[i].red, dac_val);
944 outb_p(entries[i].green, dac_val);
945 outb_p(entries[i].blue, dac_val);
946 }
947 }
948 #ifdef CONFIG_X86_32
949 else if (par->pmi_setpal) {
950 __asm__ __volatile__(
951 "call *(%%esi)"
952 : /* no return value */
953 : "a" (0x4f09), /* EAX */
954 "b" (0), /* EBX */
955 "c" (count), /* ECX */
956 "d" (start), /* EDX */
957 "D" (entries), /* EDI */
958 "S" (&par->pmi_pal)); /* ESI */
959 }
960 #endif /* CONFIG_X86_32 */
961 else
962 #endif /* CONFIG_X86 */
963 {
964 task = uvesafb_prep();
965 if (!task)
966 return -ENOMEM;
967
968 task->t.regs.eax = 0x4f09;
969 task->t.regs.ebx = 0x0;
970 task->t.regs.ecx = count;
971 task->t.regs.edx = start;
972 task->t.flags = TF_BUF_ESDI;
973 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
974 task->buf = entries;
975
976 err = uvesafb_exec(task);
977 if ((task->t.regs.eax & 0xffff) != 0x004f)
978 err = 1;
979
980 uvesafb_free(task);
981 }
982 return err;
983 }
984
985 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
986 unsigned blue, unsigned transp,
987 struct fb_info *info)
988 {
989 struct uvesafb_pal_entry entry;
990 int shift = 16 - dac_width;
991 int err = 0;
992
993 if (regno >= info->cmap.len)
994 return -EINVAL;
995
996 if (info->var.bits_per_pixel == 8) {
997 entry.red = red >> shift;
998 entry.green = green >> shift;
999 entry.blue = blue >> shift;
1000 entry.pad = 0;
1001
1002 err = uvesafb_setpalette(&entry, 1, regno, info);
1003 } else if (regno < 16) {
1004 switch (info->var.bits_per_pixel) {
1005 case 16:
1006 if (info->var.red.offset == 10) {
1007 /* 1:5:5:5 */
1008 ((u32 *) (info->pseudo_palette))[regno] =
1009 ((red & 0xf800) >> 1) |
1010 ((green & 0xf800) >> 6) |
1011 ((blue & 0xf800) >> 11);
1012 } else {
1013 /* 0:5:6:5 */
1014 ((u32 *) (info->pseudo_palette))[regno] =
1015 ((red & 0xf800) ) |
1016 ((green & 0xfc00) >> 5) |
1017 ((blue & 0xf800) >> 11);
1018 }
1019 break;
1020
1021 case 24:
1022 case 32:
1023 red >>= 8;
1024 green >>= 8;
1025 blue >>= 8;
1026 ((u32 *)(info->pseudo_palette))[regno] =
1027 (red << info->var.red.offset) |
1028 (green << info->var.green.offset) |
1029 (blue << info->var.blue.offset);
1030 break;
1031 }
1032 }
1033 return err;
1034 }
1035
1036 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1037 {
1038 struct uvesafb_pal_entry *entries;
1039 int shift = 16 - dac_width;
1040 int i, err = 0;
1041
1042 if (info->var.bits_per_pixel == 8) {
1043 if (cmap->start + cmap->len > info->cmap.start +
1044 info->cmap.len || cmap->start < info->cmap.start)
1045 return -EINVAL;
1046
1047 entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1048 if (!entries)
1049 return -ENOMEM;
1050
1051 for (i = 0; i < cmap->len; i++) {
1052 entries[i].red = cmap->red[i] >> shift;
1053 entries[i].green = cmap->green[i] >> shift;
1054 entries[i].blue = cmap->blue[i] >> shift;
1055 entries[i].pad = 0;
1056 }
1057 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1058 kfree(entries);
1059 } else {
1060 /*
1061 * For modes with bpp > 8, we only set the pseudo palette in
1062 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1063 * sanity checking.
1064 */
1065 for (i = 0; i < cmap->len; i++) {
1066 err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1067 cmap->green[i], cmap->blue[i],
1068 0, info);
1069 }
1070 }
1071 return err;
1072 }
1073
1074 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1075 struct fb_info *info)
1076 {
1077 #ifdef CONFIG_X86_32
1078 int offset;
1079 struct uvesafb_par *par = info->par;
1080
1081 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1082
1083 /*
1084 * It turns out it's not the best idea to do panning via vm86,
1085 * so we only allow it if we have a PMI.
1086 */
1087 if (par->pmi_start) {
1088 __asm__ __volatile__(
1089 "call *(%%edi)"
1090 : /* no return value */
1091 : "a" (0x4f07), /* EAX */
1092 "b" (0), /* EBX */
1093 "c" (offset), /* ECX */
1094 "d" (offset >> 16), /* EDX */
1095 "D" (&par->pmi_start)); /* EDI */
1096 }
1097 #endif
1098 return 0;
1099 }
1100
1101 static int uvesafb_blank(int blank, struct fb_info *info)
1102 {
1103 struct uvesafb_ktask *task;
1104 int err = 1;
1105 #ifdef CONFIG_X86
1106 struct uvesafb_par *par = info->par;
1107
1108 if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1109 int loop = 10000;
1110 u8 seq = 0, crtc17 = 0;
1111
1112 if (blank == FB_BLANK_POWERDOWN) {
1113 seq = 0x20;
1114 crtc17 = 0x00;
1115 err = 0;
1116 } else {
1117 seq = 0x00;
1118 crtc17 = 0x80;
1119 err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1120 }
1121
1122 vga_wseq(NULL, 0x00, 0x01);
1123 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1124 vga_wseq(NULL, 0x00, seq);
1125
1126 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1127 while (loop--);
1128 vga_wcrt(NULL, 0x17, crtc17);
1129 vga_wseq(NULL, 0x00, 0x03);
1130 } else
1131 #endif /* CONFIG_X86 */
1132 {
1133 task = uvesafb_prep();
1134 if (!task)
1135 return -ENOMEM;
1136
1137 task->t.regs.eax = 0x4f10;
1138 switch (blank) {
1139 case FB_BLANK_UNBLANK:
1140 task->t.regs.ebx = 0x0001;
1141 break;
1142 case FB_BLANK_NORMAL:
1143 task->t.regs.ebx = 0x0101; /* standby */
1144 break;
1145 case FB_BLANK_POWERDOWN:
1146 task->t.regs.ebx = 0x0401; /* powerdown */
1147 break;
1148 default:
1149 goto out;
1150 }
1151
1152 err = uvesafb_exec(task);
1153 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1154 err = 1;
1155 out: uvesafb_free(task);
1156 }
1157 return err;
1158 }
1159
1160 static int uvesafb_open(struct fb_info *info, int user)
1161 {
1162 struct uvesafb_par *par = info->par;
1163 int cnt = atomic_read(&par->ref_count);
1164 u8 *buf = NULL;
1165
1166 if (!cnt && par->vbe_state_size) {
1167 buf = uvesafb_vbe_state_save(par);
1168 if (IS_ERR(buf)) {
1169 pr_warn("save hardware state failed, error code is %ld!\n",
1170 PTR_ERR(buf));
1171 } else {
1172 par->vbe_state_orig = buf;
1173 }
1174 }
1175
1176 atomic_inc(&par->ref_count);
1177 return 0;
1178 }
1179
1180 static int uvesafb_release(struct fb_info *info, int user)
1181 {
1182 struct uvesafb_ktask *task = NULL;
1183 struct uvesafb_par *par = info->par;
1184 int cnt = atomic_read(&par->ref_count);
1185
1186 if (!cnt)
1187 return -EINVAL;
1188
1189 if (cnt != 1)
1190 goto out;
1191
1192 task = uvesafb_prep();
1193 if (!task)
1194 goto out;
1195
1196 /* First, try to set the standard 80x25 text mode. */
1197 task->t.regs.eax = 0x0003;
1198 uvesafb_exec(task);
1199
1200 /*
1201 * Now try to restore whatever hardware state we might have
1202 * saved when the fb device was first opened.
1203 */
1204 uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1205 out:
1206 atomic_dec(&par->ref_count);
1207 uvesafb_free(task);
1208 return 0;
1209 }
1210
1211 static int uvesafb_set_par(struct fb_info *info)
1212 {
1213 struct uvesafb_par *par = info->par;
1214 struct uvesafb_ktask *task = NULL;
1215 struct vbe_crtc_ib *crtc = NULL;
1216 struct vbe_mode_ib *mode = NULL;
1217 int i, err = 0, depth = info->var.bits_per_pixel;
1218
1219 if (depth > 8 && depth != 32)
1220 depth = info->var.red.length + info->var.green.length +
1221 info->var.blue.length;
1222
1223 i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1224 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1225 if (i >= 0)
1226 mode = &par->vbe_modes[i];
1227 else
1228 return -EINVAL;
1229
1230 task = uvesafb_prep();
1231 if (!task)
1232 return -ENOMEM;
1233 setmode:
1234 task->t.regs.eax = 0x4f02;
1235 task->t.regs.ebx = mode->mode_id | 0x4000; /* use LFB */
1236
1237 if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1238 info->var.pixclock != 0) {
1239 task->t.regs.ebx |= 0x0800; /* use CRTC data */
1240 task->t.flags = TF_BUF_ESDI;
1241 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1242 if (!crtc) {
1243 err = -ENOMEM;
1244 goto out;
1245 }
1246 crtc->horiz_start = info->var.xres + info->var.right_margin;
1247 crtc->horiz_end = crtc->horiz_start + info->var.hsync_len;
1248 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1249
1250 crtc->vert_start = info->var.yres + info->var.lower_margin;
1251 crtc->vert_end = crtc->vert_start + info->var.vsync_len;
1252 crtc->vert_total = crtc->vert_end + info->var.upper_margin;
1253
1254 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1255 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1256 (crtc->vert_total * crtc->horiz_total)));
1257
1258 if (info->var.vmode & FB_VMODE_DOUBLE)
1259 crtc->flags |= 0x1;
1260 if (info->var.vmode & FB_VMODE_INTERLACED)
1261 crtc->flags |= 0x2;
1262 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1263 crtc->flags |= 0x4;
1264 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1265 crtc->flags |= 0x8;
1266 memcpy(&par->crtc, crtc, sizeof(*crtc));
1267 } else {
1268 memset(&par->crtc, 0, sizeof(*crtc));
1269 }
1270
1271 task->t.buf_len = sizeof(struct vbe_crtc_ib);
1272 task->buf = &par->crtc;
1273
1274 err = uvesafb_exec(task);
1275 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1276 /*
1277 * The mode switch might have failed because we tried to
1278 * use our own timings. Try again with the default timings.
1279 */
1280 if (crtc != NULL) {
1281 pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n",
1282 task->t.regs.eax, err);
1283 uvesafb_reset(task);
1284 kfree(crtc);
1285 crtc = NULL;
1286 info->var.pixclock = 0;
1287 goto setmode;
1288 } else {
1289 pr_err("mode switch failed (eax=0x%x, err=%d)\n",
1290 task->t.regs.eax, err);
1291 err = -EINVAL;
1292 goto out;
1293 }
1294 }
1295 par->mode_idx = i;
1296
1297 /* For 8bpp modes, always try to set the DAC to 8 bits. */
1298 if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1299 mode->bits_per_pixel <= 8) {
1300 uvesafb_reset(task);
1301 task->t.regs.eax = 0x4f08;
1302 task->t.regs.ebx = 0x0800;
1303
1304 err = uvesafb_exec(task);
1305 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1306 ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1307 dac_width = 6;
1308 } else {
1309 dac_width = 8;
1310 }
1311 }
1312
1313 info->fix.visual = (info->var.bits_per_pixel == 8) ?
1314 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1315 info->fix.line_length = mode->bytes_per_scan_line;
1316
1317 out:
1318 kfree(crtc);
1319 uvesafb_free(task);
1320
1321 return err;
1322 }
1323
1324 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1325 struct fb_info *info)
1326 {
1327 const struct fb_videomode *mode;
1328 struct uvesafb_par *par = info->par;
1329
1330 /*
1331 * If pixclock is set to 0, then we're using default BIOS timings
1332 * and thus don't have to perform any checks here.
1333 */
1334 if (!var->pixclock)
1335 return;
1336
1337 if (par->vbe_ib.vbe_version < 0x0300) {
1338 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1339 return;
1340 }
1341
1342 if (!fb_validate_mode(var, info))
1343 return;
1344
1345 mode = fb_find_best_mode(var, &info->modelist);
1346 if (mode) {
1347 if (mode->xres == var->xres && mode->yres == var->yres &&
1348 !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1349 fb_videomode_to_var(var, mode);
1350 return;
1351 }
1352 }
1353
1354 if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1355 return;
1356 /* Use default refresh rate */
1357 var->pixclock = 0;
1358 }
1359
1360 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1361 struct fb_info *info)
1362 {
1363 struct uvesafb_par *par = info->par;
1364 struct vbe_mode_ib *mode = NULL;
1365 int match = -1;
1366 int depth = var->red.length + var->green.length + var->blue.length;
1367
1368 /*
1369 * Various apps will use bits_per_pixel to set the color depth,
1370 * which is theoretically incorrect, but which we'll try to handle
1371 * here.
1372 */
1373 if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1374 depth = var->bits_per_pixel;
1375
1376 match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1377 UVESAFB_EXACT_RES);
1378 if (match == -1)
1379 return -EINVAL;
1380
1381 mode = &par->vbe_modes[match];
1382 uvesafb_setup_var(var, info, mode);
1383
1384 /*
1385 * Check whether we have remapped enough memory for this mode.
1386 * We might be called at an early stage, when we haven't remapped
1387 * any memory yet, in which case we simply skip the check.
1388 */
1389 if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1390 && info->fix.smem_len)
1391 return -EINVAL;
1392
1393 if ((var->vmode & FB_VMODE_DOUBLE) &&
1394 !(par->vbe_modes[match].mode_attr & 0x100))
1395 var->vmode &= ~FB_VMODE_DOUBLE;
1396
1397 if ((var->vmode & FB_VMODE_INTERLACED) &&
1398 !(par->vbe_modes[match].mode_attr & 0x200))
1399 var->vmode &= ~FB_VMODE_INTERLACED;
1400
1401 uvesafb_check_limits(var, info);
1402
1403 var->xres_virtual = var->xres;
1404 var->yres_virtual = (par->ypan) ?
1405 info->fix.smem_len / mode->bytes_per_scan_line :
1406 var->yres;
1407 return 0;
1408 }
1409
1410 static struct fb_ops uvesafb_ops = {
1411 .owner = THIS_MODULE,
1412 .fb_open = uvesafb_open,
1413 .fb_release = uvesafb_release,
1414 .fb_setcolreg = uvesafb_setcolreg,
1415 .fb_setcmap = uvesafb_setcmap,
1416 .fb_pan_display = uvesafb_pan_display,
1417 .fb_blank = uvesafb_blank,
1418 .fb_fillrect = cfb_fillrect,
1419 .fb_copyarea = cfb_copyarea,
1420 .fb_imageblit = cfb_imageblit,
1421 .fb_check_var = uvesafb_check_var,
1422 .fb_set_par = uvesafb_set_par,
1423 };
1424
1425 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1426 {
1427 unsigned int size_vmode;
1428 unsigned int size_remap;
1429 unsigned int size_total;
1430 struct uvesafb_par *par = info->par;
1431 int i, h;
1432
1433 info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1434 info->fix = uvesafb_fix;
1435 info->fix.ypanstep = par->ypan ? 1 : 0;
1436 info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1437
1438 /* Disable blanking if the user requested so. */
1439 if (!blank)
1440 info->fbops->fb_blank = NULL;
1441
1442 /*
1443 * Find out how much IO memory is required for the mode with
1444 * the highest resolution.
1445 */
1446 size_remap = 0;
1447 for (i = 0; i < par->vbe_modes_cnt; i++) {
1448 h = par->vbe_modes[i].bytes_per_scan_line *
1449 par->vbe_modes[i].y_res;
1450 if (h > size_remap)
1451 size_remap = h;
1452 }
1453 size_remap *= 2;
1454
1455 /*
1456 * size_vmode -- that is the amount of memory needed for the
1457 * used video mode, i.e. the minimum amount of
1458 * memory we need.
1459 */
1460 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1461
1462 /*
1463 * size_total -- all video memory we have. Used for mtrr
1464 * entries, resource allocation and bounds
1465 * checking.
1466 */
1467 size_total = par->vbe_ib.total_memory * 65536;
1468 if (vram_total)
1469 size_total = vram_total * 1024 * 1024;
1470 if (size_total < size_vmode)
1471 size_total = size_vmode;
1472
1473 /*
1474 * size_remap -- the amount of video memory we are going to
1475 * use for vesafb. With modern cards it is no
1476 * option to simply use size_total as th
1477 * wastes plenty of kernel address space.
1478 */
1479 if (vram_remap)
1480 size_remap = vram_remap * 1024 * 1024;
1481 if (size_remap < size_vmode)
1482 size_remap = size_vmode;
1483 if (size_remap > size_total)
1484 size_remap = size_total;
1485
1486 info->fix.smem_len = size_remap;
1487 info->fix.smem_start = mode->phys_base_ptr;
1488
1489 /*
1490 * We have to set yres_virtual here because when setup_var() was
1491 * called, smem_len wasn't defined yet.
1492 */
1493 info->var.yres_virtual = info->fix.smem_len /
1494 mode->bytes_per_scan_line;
1495
1496 if (par->ypan && info->var.yres_virtual > info->var.yres) {
1497 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1498 (par->ypan > 1) ? "ywrap" : "ypan",
1499 info->var.yres_virtual);
1500 } else {
1501 pr_info("scrolling: redraw\n");
1502 info->var.yres_virtual = info->var.yres;
1503 par->ypan = 0;
1504 }
1505
1506 info->flags = FBINFO_FLAG_DEFAULT |
1507 (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1508
1509 if (!par->ypan)
1510 info->fbops->fb_pan_display = NULL;
1511 }
1512
1513 static void uvesafb_init_mtrr(struct fb_info *info)
1514 {
1515 struct uvesafb_par *par = info->par;
1516
1517 if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1518 int temp_size = info->fix.smem_len;
1519
1520 int rc;
1521
1522 /* Find the largest power-of-two */
1523 temp_size = roundup_pow_of_two(temp_size);
1524
1525 /* Try and find a power of two to add */
1526 do {
1527 rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1528 temp_size >>= 1;
1529 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1530
1531 if (rc >= 0)
1532 par->mtrr_handle = rc;
1533 }
1534 }
1535
1536 static void uvesafb_ioremap(struct fb_info *info)
1537 {
1538 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1539 }
1540
1541 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1542 struct device_attribute *attr, char *buf)
1543 {
1544 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1545 struct uvesafb_par *par = info->par;
1546
1547 return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1548 }
1549
1550 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1551
1552 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1553 struct device_attribute *attr, char *buf)
1554 {
1555 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1556 struct uvesafb_par *par = info->par;
1557 int ret = 0, i;
1558
1559 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1560 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1561 "%dx%d-%d, 0x%.4x\n",
1562 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1563 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1564 }
1565
1566 return ret;
1567 }
1568
1569 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1570
1571 static ssize_t uvesafb_show_vendor(struct device *dev,
1572 struct device_attribute *attr, char *buf)
1573 {
1574 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1575 struct uvesafb_par *par = info->par;
1576
1577 if (par->vbe_ib.oem_vendor_name_ptr)
1578 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1579 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1580 else
1581 return 0;
1582 }
1583
1584 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1585
1586 static ssize_t uvesafb_show_product_name(struct device *dev,
1587 struct device_attribute *attr, char *buf)
1588 {
1589 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1590 struct uvesafb_par *par = info->par;
1591
1592 if (par->vbe_ib.oem_product_name_ptr)
1593 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1594 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1595 else
1596 return 0;
1597 }
1598
1599 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1600
1601 static ssize_t uvesafb_show_product_rev(struct device *dev,
1602 struct device_attribute *attr, char *buf)
1603 {
1604 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1605 struct uvesafb_par *par = info->par;
1606
1607 if (par->vbe_ib.oem_product_rev_ptr)
1608 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1609 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1610 else
1611 return 0;
1612 }
1613
1614 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1615
1616 static ssize_t uvesafb_show_oem_string(struct device *dev,
1617 struct device_attribute *attr, char *buf)
1618 {
1619 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1620 struct uvesafb_par *par = info->par;
1621
1622 if (par->vbe_ib.oem_string_ptr)
1623 return snprintf(buf, PAGE_SIZE, "%s\n",
1624 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1625 else
1626 return 0;
1627 }
1628
1629 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1630
1631 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1632 struct device_attribute *attr, char *buf)
1633 {
1634 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1635 struct uvesafb_par *par = info->par;
1636
1637 return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1638 }
1639
1640 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1641 struct device_attribute *attr, const char *buf, size_t count)
1642 {
1643 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1644 struct uvesafb_par *par = info->par;
1645
1646 if (count > 0) {
1647 if (buf[0] == '0')
1648 par->nocrtc = 0;
1649 else
1650 par->nocrtc = 1;
1651 }
1652 return count;
1653 }
1654
1655 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1656 uvesafb_store_nocrtc);
1657
1658 static struct attribute *uvesafb_dev_attrs[] = {
1659 &dev_attr_vbe_version.attr,
1660 &dev_attr_vbe_modes.attr,
1661 &dev_attr_oem_vendor.attr,
1662 &dev_attr_oem_product_name.attr,
1663 &dev_attr_oem_product_rev.attr,
1664 &dev_attr_oem_string.attr,
1665 &dev_attr_nocrtc.attr,
1666 NULL,
1667 };
1668
1669 static const struct attribute_group uvesafb_dev_attgrp = {
1670 .name = NULL,
1671 .attrs = uvesafb_dev_attrs,
1672 };
1673
1674 static int uvesafb_probe(struct platform_device *dev)
1675 {
1676 struct fb_info *info;
1677 struct vbe_mode_ib *mode = NULL;
1678 struct uvesafb_par *par;
1679 int err = 0, i;
1680
1681 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1682 if (!info)
1683 return -ENOMEM;
1684
1685 par = info->par;
1686
1687 err = uvesafb_vbe_init(info);
1688 if (err) {
1689 pr_err("vbe_init() failed with %d\n", err);
1690 goto out;
1691 }
1692
1693 info->fbops = &uvesafb_ops;
1694
1695 i = uvesafb_vbe_init_mode(info);
1696 if (i < 0) {
1697 err = -EINVAL;
1698 goto out;
1699 } else {
1700 mode = &par->vbe_modes[i];
1701 }
1702
1703 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1704 err = -ENXIO;
1705 goto out;
1706 }
1707
1708 uvesafb_init_info(info, mode);
1709
1710 if (!request_region(0x3c0, 32, "uvesafb")) {
1711 pr_err("request region 0x3c0-0x3e0 failed\n");
1712 err = -EIO;
1713 goto out_mode;
1714 }
1715
1716 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1717 "uvesafb")) {
1718 pr_err("cannot reserve video memory at 0x%lx\n",
1719 info->fix.smem_start);
1720 err = -EIO;
1721 goto out_reg;
1722 }
1723
1724 uvesafb_init_mtrr(info);
1725 uvesafb_ioremap(info);
1726
1727 if (!info->screen_base) {
1728 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1729 info->fix.smem_len, info->fix.smem_start);
1730 err = -EIO;
1731 goto out_mem;
1732 }
1733
1734 platform_set_drvdata(dev, info);
1735
1736 if (register_framebuffer(info) < 0) {
1737 pr_err("failed to register framebuffer device\n");
1738 err = -EINVAL;
1739 goto out_unmap;
1740 }
1741
1742 pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1743 info->fix.smem_start, info->screen_base,
1744 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1745 fb_info(info, "%s frame buffer device\n", info->fix.id);
1746
1747 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1748 if (err != 0)
1749 fb_warn(info, "failed to register attributes\n");
1750
1751 return 0;
1752
1753 out_unmap:
1754 iounmap(info->screen_base);
1755 out_mem:
1756 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1757 out_reg:
1758 release_region(0x3c0, 32);
1759 out_mode:
1760 if (!list_empty(&info->modelist))
1761 fb_destroy_modelist(&info->modelist);
1762 fb_destroy_modedb(info->monspecs.modedb);
1763 fb_dealloc_cmap(&info->cmap);
1764 out:
1765 kfree(par->vbe_modes);
1766
1767 framebuffer_release(info);
1768 return err;
1769 }
1770
1771 static int uvesafb_remove(struct platform_device *dev)
1772 {
1773 struct fb_info *info = platform_get_drvdata(dev);
1774
1775 if (info) {
1776 struct uvesafb_par *par = info->par;
1777
1778 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1779 unregister_framebuffer(info);
1780 release_region(0x3c0, 32);
1781 iounmap(info->screen_base);
1782 arch_phys_wc_del(par->mtrr_handle);
1783 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1784 fb_destroy_modedb(info->monspecs.modedb);
1785 fb_dealloc_cmap(&info->cmap);
1786
1787 kfree(par->vbe_modes);
1788 kfree(par->vbe_state_orig);
1789 kfree(par->vbe_state_saved);
1790
1791 framebuffer_release(info);
1792 }
1793 return 0;
1794 }
1795
1796 static struct platform_driver uvesafb_driver = {
1797 .probe = uvesafb_probe,
1798 .remove = uvesafb_remove,
1799 .driver = {
1800 .name = "uvesafb",
1801 },
1802 };
1803
1804 static struct platform_device *uvesafb_device;
1805
1806 #ifndef MODULE
1807 static int uvesafb_setup(char *options)
1808 {
1809 char *this_opt;
1810
1811 if (!options || !*options)
1812 return 0;
1813
1814 while ((this_opt = strsep(&options, ",")) != NULL) {
1815 if (!*this_opt) continue;
1816
1817 if (!strcmp(this_opt, "redraw"))
1818 ypan = 0;
1819 else if (!strcmp(this_opt, "ypan"))
1820 ypan = 1;
1821 else if (!strcmp(this_opt, "ywrap"))
1822 ypan = 2;
1823 else if (!strcmp(this_opt, "vgapal"))
1824 pmi_setpal = 0;
1825 else if (!strcmp(this_opt, "pmipal"))
1826 pmi_setpal = 1;
1827 else if (!strncmp(this_opt, "mtrr:", 5))
1828 mtrr = simple_strtoul(this_opt+5, NULL, 0);
1829 else if (!strcmp(this_opt, "nomtrr"))
1830 mtrr = 0;
1831 else if (!strcmp(this_opt, "nocrtc"))
1832 nocrtc = 1;
1833 else if (!strcmp(this_opt, "noedid"))
1834 noedid = 1;
1835 else if (!strcmp(this_opt, "noblank"))
1836 blank = 0;
1837 else if (!strncmp(this_opt, "vtotal:", 7))
1838 vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1839 else if (!strncmp(this_opt, "vremap:", 7))
1840 vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1841 else if (!strncmp(this_opt, "maxhf:", 6))
1842 maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1843 else if (!strncmp(this_opt, "maxvf:", 6))
1844 maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1845 else if (!strncmp(this_opt, "maxclk:", 7))
1846 maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1847 else if (!strncmp(this_opt, "vbemode:", 8))
1848 vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1849 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1850 mode_option = this_opt;
1851 } else {
1852 pr_warn("unrecognized option %s\n", this_opt);
1853 }
1854 }
1855
1856 if (mtrr != 3 && mtrr != 0)
1857 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1858
1859 return 0;
1860 }
1861 #endif /* !MODULE */
1862
1863 static ssize_t v86d_show(struct device_driver *dev, char *buf)
1864 {
1865 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1866 }
1867
1868 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1869 size_t count)
1870 {
1871 strncpy(v86d_path, buf, PATH_MAX);
1872 return count;
1873 }
1874 static DRIVER_ATTR_RW(v86d);
1875
1876 static int uvesafb_init(void)
1877 {
1878 int err;
1879
1880 #ifndef MODULE
1881 char *option = NULL;
1882
1883 if (fb_get_options("uvesafb", &option))
1884 return -ENODEV;
1885 uvesafb_setup(option);
1886 #endif
1887 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1888 if (err)
1889 return err;
1890
1891 err = platform_driver_register(&uvesafb_driver);
1892
1893 if (!err) {
1894 uvesafb_device = platform_device_alloc("uvesafb", 0);
1895 if (uvesafb_device)
1896 err = platform_device_add(uvesafb_device);
1897 else
1898 err = -ENOMEM;
1899
1900 if (err) {
1901 platform_device_put(uvesafb_device);
1902 platform_driver_unregister(&uvesafb_driver);
1903 cn_del_callback(&uvesafb_cn_id);
1904 return err;
1905 }
1906
1907 err = driver_create_file(&uvesafb_driver.driver,
1908 &driver_attr_v86d);
1909 if (err) {
1910 pr_warn("failed to register attributes\n");
1911 err = 0;
1912 }
1913 }
1914 return err;
1915 }
1916
1917 module_init(uvesafb_init);
1918
1919 static void uvesafb_exit(void)
1920 {
1921 struct uvesafb_ktask *task;
1922
1923 if (v86d_started) {
1924 task = uvesafb_prep();
1925 if (task) {
1926 task->t.flags = TF_EXIT;
1927 uvesafb_exec(task);
1928 uvesafb_free(task);
1929 }
1930 }
1931
1932 cn_del_callback(&uvesafb_cn_id);
1933 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1934 platform_device_unregister(uvesafb_device);
1935 platform_driver_unregister(&uvesafb_driver);
1936 }
1937
1938 module_exit(uvesafb_exit);
1939
1940 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1941 {
1942 ypan = 0;
1943
1944 if (!strcmp(val, "redraw"))
1945 ypan = 0;
1946 else if (!strcmp(val, "ypan"))
1947 ypan = 1;
1948 else if (!strcmp(val, "ywrap"))
1949 ypan = 2;
1950 else
1951 return -EINVAL;
1952
1953 return 0;
1954 }
1955 static const struct kernel_param_ops param_ops_scroll = {
1956 .set = param_set_scroll,
1957 };
1958 #define param_check_scroll(name, p) __param_check(name, p, void)
1959
1960 module_param_named(scroll, ypan, scroll, 0);
1961 MODULE_PARM_DESC(scroll,
1962 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1963 module_param_named(vgapal, pmi_setpal, invbool, 0);
1964 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1965 module_param_named(pmipal, pmi_setpal, bool, 0);
1966 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1967 module_param(mtrr, uint, 0);
1968 MODULE_PARM_DESC(mtrr,
1969 "Memory Type Range Registers setting. Use 0 to disable.");
1970 module_param(blank, bool, 0);
1971 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1972 module_param(nocrtc, bool, 0);
1973 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1974 module_param(noedid, bool, 0);
1975 MODULE_PARM_DESC(noedid,
1976 "Ignore EDID-provided monitor limits when setting modes");
1977 module_param(vram_remap, uint, 0);
1978 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1979 module_param(vram_total, uint, 0);
1980 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
1981 module_param(maxclk, ushort, 0);
1982 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1983 module_param(maxhf, ushort, 0);
1984 MODULE_PARM_DESC(maxhf,
1985 "Maximum horizontal frequency [kHz], overrides EDID data");
1986 module_param(maxvf, ushort, 0);
1987 MODULE_PARM_DESC(maxvf,
1988 "Maximum vertical frequency [Hz], overrides EDID data");
1989 module_param(mode_option, charp, 0);
1990 MODULE_PARM_DESC(mode_option,
1991 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1992 module_param(vbemode, ushort, 0);
1993 MODULE_PARM_DESC(vbemode,
1994 "VBE mode number to set, overrides the 'mode' option");
1995 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
1996 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
1997
1998 MODULE_LICENSE("GPL");
1999 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2000 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2001
Linux with added FPC-III support