1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * A framebuffer driver for VBE 2.0+ compliant video cards
4 *
5 * (c) 2007 Michal Januszewski <spock@gentoo.org>
6 * Loosely based upon the vesafb driver.
7 *
8 */
9
10#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/skbuff.h>
16#include <linux/timer.h>
17#include <linux/completion.h>
18#include <linux/connector.h>
19#include <linux/random.h>
20#include <linux/platform_device.h>
21#include <linux/limits.h>
22#include <linux/fb.h>
23#include <linux/io.h>
24#include <linux/mutex.h>
25#include <linux/slab.h>
26#include <video/edid.h>
27#include <video/uvesafb.h>
28#ifdef CONFIG_X86
29#include <video/vga.h>
30#endif
31#include "edid.h"
32
33static struct cb_id uvesafb_cn_id = {
34 .idx = CN_IDX_V86D,
35 .val = CN_VAL_V86D_UVESAFB
36};
37static char v86d_path[PATH_MAX] = "/sbin/v86d";
38static char v86d_started; /* has v86d been started by uvesafb? */
39
40static const struct fb_fix_screeninfo uvesafb_fix = {
41 .id = "VESA VGA",
42 .type = FB_TYPE_PACKED_PIXELS,
43 .accel = FB_ACCEL_NONE,
44 .visual = FB_VISUAL_TRUECOLOR,
45};
46
47static int mtrr = 3; /* enable mtrr by default */
48static bool blank = true; /* enable blanking by default */
49static int ypan = 1; /* 0: scroll, 1: ypan, 2: ywrap */
50static bool pmi_setpal = true; /* use PMI for palette changes */
51static bool nocrtc; /* ignore CRTC settings */
52static bool noedid; /* don't try DDC transfers */
53static int vram_remap; /* set amt. of memory to be used */
54static int vram_total; /* set total amount of memory */
55static u16 maxclk; /* maximum pixel clock */
56static u16 maxvf; /* maximum vertical frequency */
57static u16 maxhf; /* maximum horizontal frequency */
58static u16 vbemode; /* force use of a specific VBE mode */
59static char *mode_option;
60static u8 dac_width = 6;
61
62static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
63static DEFINE_MUTEX(uvfb_lock);
64
65/*
66 * A handler for replies from userspace.
67 *
68 * Make sure each message passes consistency checks and if it does,
69 * find the kernel part of the task struct, copy the registers and
70 * the buffer contents and then complete the task.
71 */
72static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
73{
74 struct uvesafb_task *utask;
75 struct uvesafb_ktask *task;
76
77 if (!capable(CAP_SYS_ADMIN))
78 return;
79
80 if (msg->seq >= UVESAFB_TASKS_MAX)
81 return;
82
83 mutex_lock(&uvfb_lock);
84 task = uvfb_tasks[msg->seq];
85
86 if (!task || msg->ack != task->ack) {
87 mutex_unlock(&uvfb_lock);
88 return;
89 }
90
91 utask = (struct uvesafb_task *)msg->data;
92
93 /* Sanity checks for the buffer length. */
94 if (task->t.buf_len < utask->buf_len ||
95 utask->buf_len > msg->len - sizeof(*utask)) {
96 mutex_unlock(&uvfb_lock);
97 return;
98 }
99
100 uvfb_tasks[msg->seq] = NULL;
101 mutex_unlock(&uvfb_lock);
102
103 memcpy(&task->t, utask, sizeof(*utask));
104
105 if (task->t.buf_len && task->buf)
106 memcpy(task->buf, utask + 1, task->t.buf_len);
107
108 complete(task->done);
109 return;
110}
111
112static int uvesafb_helper_start(void)
113{
114 char *envp[] = {
115 "HOME=/",
116 "PATH=/sbin:/bin",
117 NULL,
118 };
119
120 char *argv[] = {
121 v86d_path,
122 NULL,
123 };
124
125 return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
126}
127
128/*
129 * Execute a uvesafb task.
130 *
131 * Returns 0 if the task is executed successfully.
132 *
133 * A message sent to the userspace consists of the uvesafb_task
134 * struct and (optionally) a buffer. The uvesafb_task struct is
135 * a simplified version of uvesafb_ktask (its kernel counterpart)
136 * containing only the register values, flags and the length of
137 * the buffer.
138 *
139 * Each message is assigned a sequence number (increased linearly)
140 * and a random ack number. The sequence number is used as a key
141 * for the uvfb_tasks array which holds pointers to uvesafb_ktask
142 * structs for all requests.
143 */
144static int uvesafb_exec(struct uvesafb_ktask *task)
145{
146 static int seq;
147 struct cn_msg *m;
148 int err;
149 int len = sizeof(task->t) + task->t.buf_len;
150
151 /*
152 * Check whether the message isn't longer than the maximum
153 * allowed by connector.
154 */
155 if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
156 pr_warn("message too long (%d), can't execute task\n",
157 (int)(sizeof(*m) + len));
158 return -E2BIG;
159 }
160
161 m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
162 if (!m)
163 return -ENOMEM;
164
165 init_completion(task->done);
166
167 memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
168 m->seq = seq;
169 m->len = len;
170 m->ack = prandom_u32();
171
172 /* uvesafb_task structure */
173 memcpy(m + 1, &task->t, sizeof(task->t));
174
175 /* Buffer */
176 memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
177
178 /*
179 * Save the message ack number so that we can find the kernel
180 * part of this task when a reply is received from userspace.
181 */
182 task->ack = m->ack;
183
184 mutex_lock(&uvfb_lock);
185
186 /* If all slots are taken -- bail out. */
187 if (uvfb_tasks[seq]) {
188 mutex_unlock(&uvfb_lock);
189 err = -EBUSY;
190 goto out;
191 }
192
193 /* Save a pointer to the kernel part of the task struct. */
194 uvfb_tasks[seq] = task;
195 mutex_unlock(&uvfb_lock);
196
197 err = cn_netlink_send(m, 0, 0, GFP_KERNEL);
198 if (err == -ESRCH) {
199 /*
200 * Try to start the userspace helper if sending
201 * the request failed the first time.
202 */
203 err = uvesafb_helper_start();
204 if (err) {
205 pr_err("failed to execute %s\n", v86d_path);
206 pr_err("make sure that the v86d helper is installed and executable\n");
207 } else {
208 v86d_started = 1;
209 err = cn_netlink_send(m, 0, 0, gfp_any());
210 if (err == -ENOBUFS)
211 err = 0;
212 }
213 } else if (err == -ENOBUFS)
214 err = 0;
215
216 if (!err && !(task->t.flags & TF_EXIT))
217 err = !wait_for_completion_timeout(task->done,
218 msecs_to_jiffies(UVESAFB_TIMEOUT));
219
220 mutex_lock(&uvfb_lock);
221 uvfb_tasks[seq] = NULL;
222 mutex_unlock(&uvfb_lock);
223
224 seq++;
225 if (seq >= UVESAFB_TASKS_MAX)
226 seq = 0;
227out:
228 kfree(m);
229 return err;
230}
231
232/*
233 * Free a uvesafb_ktask struct.
234 */
235static void uvesafb_free(struct uvesafb_ktask *task)
236{
237 if (task) {
238 kfree(task->done);
239 kfree(task);
240 }
241}
242
243/*
244 * Prepare a uvesafb_ktask struct to be used again.
245 */
246static void uvesafb_reset(struct uvesafb_ktask *task)
247{
248 struct completion *cpl = task->done;
249
250 memset(task, 0, sizeof(*task));
251 task->done = cpl;
252}
253
254/*
255 * Allocate and prepare a uvesafb_ktask struct.
256 */
257static struct uvesafb_ktask *uvesafb_prep(void)
258{
259 struct uvesafb_ktask *task;
260
261 task = kzalloc(sizeof(*task), GFP_KERNEL);
262 if (task) {
263 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
264 if (!task->done) {
265 kfree(task);
266 task = NULL;
267 }
268 }
269 return task;
270}
271
272static void uvesafb_setup_var(struct fb_var_screeninfo *var,
273 struct fb_info *info, struct vbe_mode_ib *mode)
274{
275 struct uvesafb_par *par = info->par;
276
277 var->vmode = FB_VMODE_NONINTERLACED;
278 var->sync = FB_SYNC_VERT_HIGH_ACT;
279
280 var->xres = mode->x_res;
281 var->yres = mode->y_res;
282 var->xres_virtual = mode->x_res;
283 var->yres_virtual = (par->ypan) ?
284 info->fix.smem_len / mode->bytes_per_scan_line :
285 mode->y_res;
286 var->xoffset = 0;
287 var->yoffset = 0;
288 var->bits_per_pixel = mode->bits_per_pixel;
289
290 if (var->bits_per_pixel == 15)
291 var->bits_per_pixel = 16;
292
293 if (var->bits_per_pixel > 8) {
294 var->red.offset = mode->red_off;
295 var->red.length = mode->red_len;
296 var->green.offset = mode->green_off;
297 var->green.length = mode->green_len;
298 var->blue.offset = mode->blue_off;
299 var->blue.length = mode->blue_len;
300 var->transp.offset = mode->rsvd_off;
301 var->transp.length = mode->rsvd_len;
302 } else {
303 var->red.offset = 0;
304 var->green.offset = 0;
305 var->blue.offset = 0;
306 var->transp.offset = 0;
307
308 var->red.length = 8;
309 var->green.length = 8;
310 var->blue.length = 8;
311 var->transp.length = 0;
312 }
313}
314
315static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
316 int xres, int yres, int depth, unsigned char flags)
317{
318 int i, match = -1, h = 0, d = 0x7fffffff;
319
320 for (i = 0; i < par->vbe_modes_cnt; i++) {
321 h = abs(par->vbe_modes[i].x_res - xres) +
322 abs(par->vbe_modes[i].y_res - yres) +
323 abs(depth - par->vbe_modes[i].depth);
324
325 /*
326 * We have an exact match in terms of resolution
327 * and depth.
328 */
329 if (h == 0)
330 return i;
331
332 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
333 d = h;
334 match = i;
335 }
336 }
337 i = 1;
338
339 if (flags & UVESAFB_EXACT_DEPTH &&
340 par->vbe_modes[match].depth != depth)
341 i = 0;
342
343 if (flags & UVESAFB_EXACT_RES && d > 24)
344 i = 0;
345
346 if (i != 0)
347 return match;
348 else
349 return -1;
350}
351
352static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
353{
354 struct uvesafb_ktask *task;
355 u8 *state;
356 int err;
357
358 if (!par->vbe_state_size)
359 return NULL;
360
361 state = kmalloc(par->vbe_state_size, GFP_KERNEL);
362 if (!state)
363 return ERR_PTR(-ENOMEM);
364
365 task = uvesafb_prep();
366 if (!task) {
367 kfree(state);
368 return NULL;
369 }
370
371 task->t.regs.eax = 0x4f04;
372 task->t.regs.ecx = 0x000f;
373 task->t.regs.edx = 0x0001;
374 task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
375 task->t.buf_len = par->vbe_state_size;
376 task->buf = state;
377 err = uvesafb_exec(task);
378
379 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
380 pr_warn("VBE get state call failed (eax=0x%x, err=%d)\n",
381 task->t.regs.eax, err);
382 kfree(state);
383 state = NULL;
384 }
385
386 uvesafb_free(task);
387 return state;
388}
389
390static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
391{
392 struct uvesafb_ktask *task;
393 int err;
394
395 if (!state_buf)
396 return;
397
398 task = uvesafb_prep();
399 if (!task)
400 return;
401
402 task->t.regs.eax = 0x4f04;
403 task->t.regs.ecx = 0x000f;
404 task->t.regs.edx = 0x0002;
405 task->t.buf_len = par->vbe_state_size;
406 task->t.flags = TF_BUF_ESBX;
407 task->buf = state_buf;
408
409 err = uvesafb_exec(task);
410 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
411 pr_warn("VBE state restore call failed (eax=0x%x, err=%d)\n",
412 task->t.regs.eax, err);
413
414 uvesafb_free(task);
415}
416
417static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
418 struct uvesafb_par *par)
419{
420 int err;
421
422 task->t.regs.eax = 0x4f00;
423 task->t.flags = TF_VBEIB;
424 task->t.buf_len = sizeof(struct vbe_ib);
425 task->buf = &par->vbe_ib;
426 memcpy(par->vbe_ib.vbe_signature, "VBE2", 4);
427
428 err = uvesafb_exec(task);
429 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
430 pr_err("Getting VBE info block failed (eax=0x%x, err=%d)\n",
431 (u32)task->t.regs.eax, err);
432 return -EINVAL;
433 }
434
435 if (par->vbe_ib.vbe_version < 0x0200) {
436 pr_err("Sorry, pre-VBE 2.0 cards are not supported\n");
437 return -EINVAL;
438 }
439
440 if (!par->vbe_ib.mode_list_ptr) {
441 pr_err("Missing mode list!\n");
442 return -EINVAL;
443 }
444
445 pr_info("");
446
447 /*
448 * Convert string pointers and the mode list pointer into
449 * usable addresses. Print informational messages about the
450 * video adapter and its vendor.
451 */
452 if (par->vbe_ib.oem_vendor_name_ptr)
453 pr_cont("%s, ",
454 ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
455
456 if (par->vbe_ib.oem_product_name_ptr)
457 pr_cont("%s, ",
458 ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
459
460 if (par->vbe_ib.oem_product_rev_ptr)
461 pr_cont("%s, ",
462 ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
463
464 if (par->vbe_ib.oem_string_ptr)
465 pr_cont("OEM: %s, ",
466 ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
467
468 pr_cont("VBE v%d.%d\n",
469 (par->vbe_ib.vbe_version & 0xff00) >> 8,
470 par->vbe_ib.vbe_version & 0xff);
471
472 return 0;
473}
474
475static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
476 struct uvesafb_par *par)
477{
478 int off = 0, err;
479 u16 *mode;
480
481 par->vbe_modes_cnt = 0;
482
483 /* Count available modes. */
484 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
485 while (*mode != 0xffff) {
486 par->vbe_modes_cnt++;
487 mode++;
488 }
489
490 par->vbe_modes = kcalloc(par->vbe_modes_cnt,
491 sizeof(struct vbe_mode_ib),
492 GFP_KERNEL);
493 if (!par->vbe_modes)
494 return -ENOMEM;
495
496 /* Get info about all available modes. */
497 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
498 while (*mode != 0xffff) {
499 struct vbe_mode_ib *mib;
500
501 uvesafb_reset(task);
502 task->t.regs.eax = 0x4f01;
503 task->t.regs.ecx = (u32) *mode;
504 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
505 task->t.buf_len = sizeof(struct vbe_mode_ib);
506 task->buf = par->vbe_modes + off;
507
508 err = uvesafb_exec(task);
509 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
510 pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
511 *mode, (u32)task->t.regs.eax, err);
512 mode++;
513 par->vbe_modes_cnt--;
514 continue;
515 }
516
517 mib = task->buf;
518 mib->mode_id = *mode;
519
520 /*
521 * We only want modes that are supported with the current
522 * hardware configuration, color, graphics and that have
523 * support for the LFB.
524 */
525 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
526 mib->bits_per_pixel >= 8)
527 off++;
528 else
529 par->vbe_modes_cnt--;
530
531 mode++;
532 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
533
534 /*
535 * Handle 8bpp modes and modes with broken color component
536 * lengths.
537 */
538 if (mib->depth == 0 || (mib->depth == 24 &&
539 mib->bits_per_pixel == 32))
540 mib->depth = mib->bits_per_pixel;
541 }
542
543 if (par->vbe_modes_cnt > 0)
544 return 0;
545 else
546 return -EINVAL;
547}
548
549/*
550 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
551 * x86 and not x86_64.
552 */
553#ifdef CONFIG_X86_32
554static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
555 struct uvesafb_par *par)
556{
557 int i, err;
558
559 uvesafb_reset(task);
560 task->t.regs.eax = 0x4f0a;
561 task->t.regs.ebx = 0x0;
562 err = uvesafb_exec(task);
563 if (err)
564 return err;
565
566 if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
567 par->pmi_setpal = par->ypan = 0;
568 } else {
569 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
570 + task->t.regs.edi);
571 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
572 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
573 pr_info("protected mode interface info at %04x:%04x\n",
574 (u16)task->t.regs.es, (u16)task->t.regs.edi);
575 pr_info("pmi: set display start = %p, set palette = %p\n",
576 par->pmi_start, par->pmi_pal);
577
578 if (par->pmi_base[3]) {
579 pr_info("pmi: ports =");
580 for (i = par->pmi_base[3]/2;
581 par->pmi_base[i] != 0xffff; i++)
582 pr_cont(" %x", par->pmi_base[i]);
583 pr_cont("\n");
584
585 if (par->pmi_base[i] != 0xffff) {
586 pr_info("can't handle memory requests, pmi disabled\n");
587 par->ypan = par->pmi_setpal = 0;
588 }
589 }
590 }
591 return 0;
592}
593#endif /* CONFIG_X86_32 */
594
595/*
596 * Check whether a video mode is supported by the Video BIOS and is
597 * compatible with the monitor limits.
598 */
599static int uvesafb_is_valid_mode(struct fb_videomode *mode,
600 struct fb_info *info)
601{
602 if (info->monspecs.gtf) {
603 fb_videomode_to_var(&info->var, mode);
604 if (fb_validate_mode(&info->var, info))
605 return 0;
606 }
607
608 if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
609 UVESAFB_EXACT_RES) == -1)
610 return 0;
611
612 return 1;
613}
614
615static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
616{
617 struct uvesafb_par *par = info->par;
618 int err = 0;
619
620 if (noedid || par->vbe_ib.vbe_version < 0x0300)
621 return -EINVAL;
622
623 task->t.regs.eax = 0x4f15;
624 task->t.regs.ebx = 0;
625 task->t.regs.ecx = 0;
626 task->t.buf_len = 0;
627 task->t.flags = 0;
628
629 err = uvesafb_exec(task);
630
631 if ((task->t.regs.eax & 0xffff) != 0x004f || err)
632 return -EINVAL;
633
634 if ((task->t.regs.ebx & 0x3) == 3) {
635 pr_info("VBIOS/hardware supports both DDC1 and DDC2 transfers\n");
636 } else if ((task->t.regs.ebx & 0x3) == 2) {
637 pr_info("VBIOS/hardware supports DDC2 transfers\n");
638 } else if ((task->t.regs.ebx & 0x3) == 1) {
639 pr_info("VBIOS/hardware supports DDC1 transfers\n");
640 } else {
641 pr_info("VBIOS/hardware doesn't support DDC transfers\n");
642 return -EINVAL;
643 }
644
645 task->t.regs.eax = 0x4f15;
646 task->t.regs.ebx = 1;
647 task->t.regs.ecx = task->t.regs.edx = 0;
648 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
649 task->t.buf_len = EDID_LENGTH;
650 task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
651 if (!task->buf)
652 return -ENOMEM;
653
654 err = uvesafb_exec(task);
655
656 if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
657 fb_edid_to_monspecs(task->buf, &info->monspecs);
658
659 if (info->monspecs.vfmax && info->monspecs.hfmax) {
660 /*
661 * If the maximum pixel clock wasn't specified in
662 * the EDID block, set it to 300 MHz.
663 */
664 if (info->monspecs.dclkmax == 0)
665 info->monspecs.dclkmax = 300 * 1000000;
666 info->monspecs.gtf = 1;
667 }
668 } else {
669 err = -EINVAL;
670 }
671
672 kfree(task->buf);
673 return err;
674}
675
676static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
677 struct fb_info *info)
678{
679 struct uvesafb_par *par = info->par;
680 int i;
681
682 memset(&info->monspecs, 0, sizeof(info->monspecs));
683
684 /*
685 * If we don't get all necessary data from the EDID block,
686 * mark it as incompatible with the GTF and set nocrtc so
687 * that we always use the default BIOS refresh rate.
688 */
689 if (uvesafb_vbe_getedid(task, info)) {
690 info->monspecs.gtf = 0;
691 par->nocrtc = 1;
692 }
693
694 /* Kernel command line overrides. */
695 if (maxclk)
696 info->monspecs.dclkmax = maxclk * 1000000;
697 if (maxvf)
698 info->monspecs.vfmax = maxvf;
699 if (maxhf)
700 info->monspecs.hfmax = maxhf * 1000;
701
702 /*
703 * In case DDC transfers are not supported, the user can provide
704 * monitor limits manually. Lower limits are set to "safe" values.
705 */
706 if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
707 info->monspecs.dclkmin = 0;
708 info->monspecs.vfmin = 60;
709 info->monspecs.hfmin = 29000;
710 info->monspecs.gtf = 1;
711 par->nocrtc = 0;
712 }
713
714 if (info->monspecs.gtf)
715 pr_info("monitor limits: vf = %d Hz, hf = %d kHz, clk = %d MHz\n",
716 info->monspecs.vfmax,
717 (int)(info->monspecs.hfmax / 1000),
718 (int)(info->monspecs.dclkmax / 1000000));
719 else
720 pr_info("no monitor limits have been set, default refresh rate will be used\n");
721
722 /* Add VBE modes to the modelist. */
723 for (i = 0; i < par->vbe_modes_cnt; i++) {
724 struct fb_var_screeninfo var;
725 struct vbe_mode_ib *mode;
726 struct fb_videomode vmode;
727
728 mode = &par->vbe_modes[i];
729 memset(&var, 0, sizeof(var));
730
731 var.xres = mode->x_res;
732 var.yres = mode->y_res;
733
734 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
735 fb_var_to_videomode(&vmode, &var);
736 fb_add_videomode(&vmode, &info->modelist);
737 }
738
739 /* Add valid VESA modes to our modelist. */
740 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
741 if (uvesafb_is_valid_mode((struct fb_videomode *)
742 &vesa_modes[i], info))
743 fb_add_videomode(&vesa_modes[i], &info->modelist);
744 }
745
746 for (i = 0; i < info->monspecs.modedb_len; i++) {
747 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
748 fb_add_videomode(&info->monspecs.modedb[i],
749 &info->modelist);
750 }
751
752 return;
753}
754
755static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
756 struct uvesafb_par *par)
757{
758 int err;
759
760 uvesafb_reset(task);
761
762 /*
763 * Get the VBE state buffer size. We want all available
764 * hardware state data (CL = 0x0f).
765 */
766 task->t.regs.eax = 0x4f04;
767 task->t.regs.ecx = 0x000f;
768 task->t.regs.edx = 0x0000;
769 task->t.flags = 0;
770
771 err = uvesafb_exec(task);
772
773 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
774 pr_warn("VBE state buffer size cannot be determined (eax=0x%x, err=%d)\n",
775 task->t.regs.eax, err);
776 par->vbe_state_size = 0;
777 return;
778 }
779
780 par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
781}
782
783static int uvesafb_vbe_init(struct fb_info *info)
784{
785 struct uvesafb_ktask *task = NULL;
786 struct uvesafb_par *par = info->par;
787 int err;
788
789 task = uvesafb_prep();
790 if (!task)
791 return -ENOMEM;
792
793 err = uvesafb_vbe_getinfo(task, par);
794 if (err)
795 goto out;
796
797 err = uvesafb_vbe_getmodes(task, par);
798 if (err)
799 goto out;
800
801 par->nocrtc = nocrtc;
802#ifdef CONFIG_X86_32
803 par->pmi_setpal = pmi_setpal;
804 par->ypan = ypan;
805
806 if (par->pmi_setpal || par->ypan) {
807 if (__supported_pte_mask & _PAGE_NX) {
808 par->pmi_setpal = par->ypan = 0;
809 pr_warn("NX protection is active, better not use the PMI\n");
810 } else {
811 uvesafb_vbe_getpmi(task, par);
812 }
813 }
814#else
815 /* The protected mode interface is not available on non-x86. */
816 par->pmi_setpal = par->ypan = 0;
817#endif
818
819 INIT_LIST_HEAD(&info->modelist);
820 uvesafb_vbe_getmonspecs(task, info);
821 uvesafb_vbe_getstatesize(task, par);
822
823out: uvesafb_free(task);
824 return err;
825}
826
827static int uvesafb_vbe_init_mode(struct fb_info *info)
828{
829 struct list_head *pos;
830 struct fb_modelist *modelist;
831 struct fb_videomode *mode;
832 struct uvesafb_par *par = info->par;
833 int i, modeid;
834
835 /* Has the user requested a specific VESA mode? */
836 if (vbemode) {
837 for (i = 0; i < par->vbe_modes_cnt; i++) {
838 if (par->vbe_modes[i].mode_id == vbemode) {
839 modeid = i;
840 uvesafb_setup_var(&info->var, info,
841 &par->vbe_modes[modeid]);
842 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
843 &info->var, info);
844 /*
845 * With pixclock set to 0, the default BIOS
846 * timings will be used in set_par().
847 */
848 info->var.pixclock = 0;
849 goto gotmode;
850 }
851 }
852 pr_info("requested VBE mode 0x%x is unavailable\n", vbemode);
853 vbemode = 0;
854 }
855
856 /* Count the modes in the modelist */
857 i = 0;
858 list_for_each(pos, &info->modelist)
859 i++;
860
861 /*
862 * Convert the modelist into a modedb so that we can use it with
863 * fb_find_mode().
864 */
865 mode = kcalloc(i, sizeof(*mode), GFP_KERNEL);
866 if (mode) {
867 i = 0;
868 list_for_each(pos, &info->modelist) {
869 modelist = list_entry(pos, struct fb_modelist, list);
870 mode[i] = modelist->mode;
871 i++;
872 }
873
874 if (!mode_option)
875 mode_option = UVESAFB_DEFAULT_MODE;
876
877 i = fb_find_mode(&info->var, info, mode_option, mode, i,
878 NULL, 8);
879
880 kfree(mode);
881 }
882
883 /* fb_find_mode() failed */
884 if (i == 0) {
885 info->var.xres = 640;
886 info->var.yres = 480;
887 mode = (struct fb_videomode *)
888 fb_find_best_mode(&info->var, &info->modelist);
889
890 if (mode) {
891 fb_videomode_to_var(&info->var, mode);
892 } else {
893 modeid = par->vbe_modes[0].mode_id;
894 uvesafb_setup_var(&info->var, info,
895 &par->vbe_modes[modeid]);
896 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
897 &info->var, info);
898
899 goto gotmode;
900 }
901 }
902
903 /* Look for a matching VBE mode. */
904 modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
905 info->var.bits_per_pixel, UVESAFB_EXACT_RES);
906
907 if (modeid == -1)
908 return -EINVAL;
909
910 uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
911
912gotmode:
913 /*
914 * If we are not VBE3.0+ compliant, we're done -- the BIOS will
915 * ignore our timings anyway.
916 */
917 if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
918 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
919 &info->var, info);
920
921 return modeid;
922}
923
924static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
925 int start, struct fb_info *info)
926{
927 struct uvesafb_ktask *task;
928#ifdef CONFIG_X86
929 struct uvesafb_par *par = info->par;
930 int i = par->mode_idx;
931#endif
932 int err = 0;
933
934 /*
935 * We support palette modifications for 8 bpp modes only, so
936 * there can never be more than 256 entries.
937 */
938 if (start + count > 256)
939 return -EINVAL;
940
941#ifdef CONFIG_X86
942 /* Use VGA registers if mode is VGA-compatible. */
943 if (i >= 0 && i < par->vbe_modes_cnt &&
944 par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
945 for (i = 0; i < count; i++) {
946 outb_p(start + i, dac_reg);
947 outb_p(entries[i].red, dac_val);
948 outb_p(entries[i].green, dac_val);
949 outb_p(entries[i].blue, dac_val);
950 }
951 }
952#ifdef CONFIG_X86_32
953 else if (par->pmi_setpal) {
954 __asm__ __volatile__(
955 "call *(%%esi)"
956 : /* no return value */
957 : "a" (0x4f09), /* EAX */
958 "b" (0), /* EBX */
959 "c" (count), /* ECX */
960 "d" (start), /* EDX */
961 "D" (entries), /* EDI */
962 "S" (&par->pmi_pal)); /* ESI */
963 }
964#endif /* CONFIG_X86_32 */
965 else
966#endif /* CONFIG_X86 */
967 {
968 task = uvesafb_prep();
969 if (!task)
970 return -ENOMEM;
971
972 task->t.regs.eax = 0x4f09;
973 task->t.regs.ebx = 0x0;
974 task->t.regs.ecx = count;
975 task->t.regs.edx = start;
976 task->t.flags = TF_BUF_ESDI;
977 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
978 task->buf = entries;
979
980 err = uvesafb_exec(task);
981 if ((task->t.regs.eax & 0xffff) != 0x004f)
982 err = 1;
983
984 uvesafb_free(task);
985 }
986 return err;
987}
988
989static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
990 unsigned blue, unsigned transp,
991 struct fb_info *info)
992{
993 struct uvesafb_pal_entry entry;
994 int shift = 16 - dac_width;
995 int err = 0;
996
997 if (regno >= info->cmap.len)
998 return -EINVAL;
999
1000 if (info->var.bits_per_pixel == 8) {
1001 entry.red = red >> shift;
1002 entry.green = green >> shift;
1003 entry.blue = blue >> shift;
1004 entry.pad = 0;
1005
1006 err = uvesafb_setpalette(&entry, 1, regno, info);
1007 } else if (regno < 16) {
1008 switch (info->var.bits_per_pixel) {
1009 case 16:
1010 if (info->var.red.offset == 10) {
1011 /* 1:5:5:5 */
1012 ((u32 *) (info->pseudo_palette))[regno] =
1013 ((red & 0xf800) >> 1) |
1014 ((green & 0xf800) >> 6) |
1015 ((blue & 0xf800) >> 11);
1016 } else {
1017 /* 0:5:6:5 */
1018 ((u32 *) (info->pseudo_palette))[regno] =
1019 ((red & 0xf800) ) |
1020 ((green & 0xfc00) >> 5) |
1021 ((blue & 0xf800) >> 11);
1022 }
1023 break;
1024
1025 case 24:
1026 case 32:
1027 red >>= 8;
1028 green >>= 8;
1029 blue >>= 8;
1030 ((u32 *)(info->pseudo_palette))[regno] =
1031 (red << info->var.red.offset) |
1032 (green << info->var.green.offset) |
1033 (blue << info->var.blue.offset);
1034 break;
1035 }
1036 }
1037 return err;
1038}
1039
1040static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1041{
1042 struct uvesafb_pal_entry *entries;
1043 int shift = 16 - dac_width;
1044 int i, err = 0;
1045
1046 if (info->var.bits_per_pixel == 8) {
1047 if (cmap->start + cmap->len > info->cmap.start +
1048 info->cmap.len || cmap->start < info->cmap.start)
1049 return -EINVAL;
1050
1051 entries = kmalloc_array(cmap->len, sizeof(*entries),
1052 GFP_KERNEL);
1053 if (!entries)
1054 return -ENOMEM;
1055
1056 for (i = 0; i < cmap->len; i++) {
1057 entries[i].red = cmap->red[i] >> shift;
1058 entries[i].green = cmap->green[i] >> shift;
1059 entries[i].blue = cmap->blue[i] >> shift;
1060 entries[i].pad = 0;
1061 }
1062 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1063 kfree(entries);
1064 } else {
1065 /*
1066 * For modes with bpp > 8, we only set the pseudo palette in
1067 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1068 * sanity checking.
1069 */
1070 for (i = 0; i < cmap->len; i++) {
1071 err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1072 cmap->green[i], cmap->blue[i],
1073 0, info);
1074 }
1075 }
1076 return err;
1077}
1078
1079static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1080 struct fb_info *info)
1081{
1082#ifdef CONFIG_X86_32
1083 int offset;
1084 struct uvesafb_par *par = info->par;
1085
1086 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1087
1088 /*
1089 * It turns out it's not the best idea to do panning via vm86,
1090 * so we only allow it if we have a PMI.
1091 */
1092 if (par->pmi_start) {
1093 __asm__ __volatile__(
1094 "call *(%%edi)"
1095 : /* no return value */
1096 : "a" (0x4f07), /* EAX */
1097 "b" (0), /* EBX */
1098 "c" (offset), /* ECX */
1099 "d" (offset >> 16), /* EDX */
1100 "D" (&par->pmi_start)); /* EDI */
1101 }
1102#endif
1103 return 0;
1104}
1105
1106static int uvesafb_blank(int blank, struct fb_info *info)
1107{
1108 struct uvesafb_ktask *task;
1109 int err = 1;
1110#ifdef CONFIG_X86
1111 struct uvesafb_par *par = info->par;
1112
1113 if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1114 int loop = 10000;
1115 u8 seq = 0, crtc17 = 0;
1116
1117 if (blank == FB_BLANK_POWERDOWN) {
1118 seq = 0x20;
1119 crtc17 = 0x00;
1120 err = 0;
1121 } else {
1122 seq = 0x00;
1123 crtc17 = 0x80;
1124 err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1125 }
1126
1127 vga_wseq(NULL, 0x00, 0x01);
1128 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1129 vga_wseq(NULL, 0x00, seq);
1130
1131 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1132 while (loop--);
1133 vga_wcrt(NULL, 0x17, crtc17);
1134 vga_wseq(NULL, 0x00, 0x03);
1135 } else
1136#endif /* CONFIG_X86 */
1137 {
1138 task = uvesafb_prep();
1139 if (!task)
1140 return -ENOMEM;
1141
1142 task->t.regs.eax = 0x4f10;
1143 switch (blank) {
1144 case FB_BLANK_UNBLANK:
1145 task->t.regs.ebx = 0x0001;
1146 break;
1147 case FB_BLANK_NORMAL:
1148 task->t.regs.ebx = 0x0101; /* standby */
1149 break;
1150 case FB_BLANK_POWERDOWN:
1151 task->t.regs.ebx = 0x0401; /* powerdown */
1152 break;
1153 default:
1154 goto out;
1155 }
1156
1157 err = uvesafb_exec(task);
1158 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1159 err = 1;
1160out: uvesafb_free(task);
1161 }
1162 return err;
1163}
1164
1165static int uvesafb_open(struct fb_info *info, int user)
1166{
1167 struct uvesafb_par *par = info->par;
1168 int cnt = atomic_read(&par->ref_count);
1169 u8 *buf = NULL;
1170
1171 if (!cnt && par->vbe_state_size) {
1172 buf = uvesafb_vbe_state_save(par);
1173 if (IS_ERR(buf)) {
1174 pr_warn("save hardware state failed, error code is %ld!\n",
1175 PTR_ERR(buf));
1176 } else {
1177 par->vbe_state_orig = buf;
1178 }
1179 }
1180
1181 atomic_inc(&par->ref_count);
1182 return 0;
1183}
1184
1185static int uvesafb_release(struct fb_info *info, int user)
1186{
1187 struct uvesafb_ktask *task = NULL;
1188 struct uvesafb_par *par = info->par;
1189 int cnt = atomic_read(&par->ref_count);
1190
1191 if (!cnt)
1192 return -EINVAL;
1193
1194 if (cnt != 1)
1195 goto out;
1196
1197 task = uvesafb_prep();
1198 if (!task)
1199 goto out;
1200
1201 /* First, try to set the standard 80x25 text mode. */
1202 task->t.regs.eax = 0x0003;
1203 uvesafb_exec(task);
1204
1205 /*
1206 * Now try to restore whatever hardware state we might have
1207 * saved when the fb device was first opened.
1208 */
1209 uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1210out:
1211 atomic_dec(&par->ref_count);
1212 uvesafb_free(task);
1213 return 0;
1214}
1215
1216static int uvesafb_set_par(struct fb_info *info)
1217{
1218 struct uvesafb_par *par = info->par;
1219 struct uvesafb_ktask *task = NULL;
1220 struct vbe_crtc_ib *crtc = NULL;
1221 struct vbe_mode_ib *mode = NULL;
1222 int i, err = 0, depth = info->var.bits_per_pixel;
1223
1224 if (depth > 8 && depth != 32)
1225 depth = info->var.red.length + info->var.green.length +
1226 info->var.blue.length;
1227
1228 i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1229 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1230 if (i >= 0)
1231 mode = &par->vbe_modes[i];
1232 else
1233 return -EINVAL;
1234
1235 task = uvesafb_prep();
1236 if (!task)
1237 return -ENOMEM;
1238setmode:
1239 task->t.regs.eax = 0x4f02;
1240 task->t.regs.ebx = mode->mode_id | 0x4000; /* use LFB */
1241
1242 if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1243 info->var.pixclock != 0) {
1244 task->t.regs.ebx |= 0x0800; /* use CRTC data */
1245 task->t.flags = TF_BUF_ESDI;
1246 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1247 if (!crtc) {
1248 err = -ENOMEM;
1249 goto out;
1250 }
1251 crtc->horiz_start = info->var.xres + info->var.right_margin;
1252 crtc->horiz_end = crtc->horiz_start + info->var.hsync_len;
1253 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1254
1255 crtc->vert_start = info->var.yres + info->var.lower_margin;
1256 crtc->vert_end = crtc->vert_start + info->var.vsync_len;
1257 crtc->vert_total = crtc->vert_end + info->var.upper_margin;
1258
1259 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1260 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1261 (crtc->vert_total * crtc->horiz_total)));
1262
1263 if (info->var.vmode & FB_VMODE_DOUBLE)
1264 crtc->flags |= 0x1;
1265 if (info->var.vmode & FB_VMODE_INTERLACED)
1266 crtc->flags |= 0x2;
1267 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1268 crtc->flags |= 0x4;
1269 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1270 crtc->flags |= 0x8;
1271 memcpy(&par->crtc, crtc, sizeof(*crtc));
1272 } else {
1273 memset(&par->crtc, 0, sizeof(*crtc));
1274 }
1275
1276 task->t.buf_len = sizeof(struct vbe_crtc_ib);
1277 task->buf = &par->crtc;
1278
1279 err = uvesafb_exec(task);
1280 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1281 /*
1282 * The mode switch might have failed because we tried to
1283 * use our own timings. Try again with the default timings.
1284 */
1285 if (crtc != NULL) {
1286 pr_warn("mode switch failed (eax=0x%x, err=%d) - trying again with default timings\n",
1287 task->t.regs.eax, err);
1288 uvesafb_reset(task);
1289 kfree(crtc);
1290 crtc = NULL;
1291 info->var.pixclock = 0;
1292 goto setmode;
1293 } else {
1294 pr_err("mode switch failed (eax=0x%x, err=%d)\n",
1295 task->t.regs.eax, err);
1296 err = -EINVAL;
1297 goto out;
1298 }
1299 }
1300 par->mode_idx = i;
1301
1302 /* For 8bpp modes, always try to set the DAC to 8 bits. */
1303 if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1304 mode->bits_per_pixel <= 8) {
1305 uvesafb_reset(task);
1306 task->t.regs.eax = 0x4f08;
1307 task->t.regs.ebx = 0x0800;
1308
1309 err = uvesafb_exec(task);
1310 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1311 ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1312 dac_width = 6;
1313 } else {
1314 dac_width = 8;
1315 }
1316 }
1317
1318 info->fix.visual = (info->var.bits_per_pixel == 8) ?
1319 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1320 info->fix.line_length = mode->bytes_per_scan_line;
1321
1322out:
1323 kfree(crtc);
1324 uvesafb_free(task);
1325
1326 return err;
1327}
1328
1329static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1330 struct fb_info *info)
1331{
1332 const struct fb_videomode *mode;
1333 struct uvesafb_par *par = info->par;
1334
1335 /*
1336 * If pixclock is set to 0, then we're using default BIOS timings
1337 * and thus don't have to perform any checks here.
1338 */
1339 if (!var->pixclock)
1340 return;
1341
1342 if (par->vbe_ib.vbe_version < 0x0300) {
1343 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1344 return;
1345 }
1346
1347 if (!fb_validate_mode(var, info))
1348 return;
1349
1350 mode = fb_find_best_mode(var, &info->modelist);
1351 if (mode) {
1352 if (mode->xres == var->xres && mode->yres == var->yres &&
1353 !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1354 fb_videomode_to_var(var, mode);
1355 return;
1356 }
1357 }
1358
1359 if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1360 return;
1361 /* Use default refresh rate */
1362 var->pixclock = 0;
1363}
1364
1365static int uvesafb_check_var(struct fb_var_screeninfo *var,
1366 struct fb_info *info)
1367{
1368 struct uvesafb_par *par = info->par;
1369 struct vbe_mode_ib *mode = NULL;
1370 int match = -1;
1371 int depth = var->red.length + var->green.length + var->blue.length;
1372
1373 /*
1374 * Various apps will use bits_per_pixel to set the color depth,
1375 * which is theoretically incorrect, but which we'll try to handle
1376 * here.
1377 */
1378 if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1379 depth = var->bits_per_pixel;
1380
1381 match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1382 UVESAFB_EXACT_RES);
1383 if (match == -1)
1384 return -EINVAL;
1385
1386 mode = &par->vbe_modes[match];
1387 uvesafb_setup_var(var, info, mode);
1388
1389 /*
1390 * Check whether we have remapped enough memory for this mode.
1391 * We might be called at an early stage, when we haven't remapped
1392 * any memory yet, in which case we simply skip the check.
1393 */
1394 if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1395 && info->fix.smem_len)
1396 return -EINVAL;
1397
1398 if ((var->vmode & FB_VMODE_DOUBLE) &&
1399 !(par->vbe_modes[match].mode_attr & 0x100))
1400 var->vmode &= ~FB_VMODE_DOUBLE;
1401
1402 if ((var->vmode & FB_VMODE_INTERLACED) &&
1403 !(par->vbe_modes[match].mode_attr & 0x200))
1404 var->vmode &= ~FB_VMODE_INTERLACED;
1405
1406 uvesafb_check_limits(var, info);
1407
1408 var->xres_virtual = var->xres;
1409 var->yres_virtual = (par->ypan) ?
1410 info->fix.smem_len / mode->bytes_per_scan_line :
1411 var->yres;
1412 return 0;
1413}
1414
1415static struct fb_ops uvesafb_ops = {
1416 .owner = THIS_MODULE,
1417 .fb_open = uvesafb_open,
1418 .fb_release = uvesafb_release,
1419 .fb_setcolreg = uvesafb_setcolreg,
1420 .fb_setcmap = uvesafb_setcmap,
1421 .fb_pan_display = uvesafb_pan_display,
1422 .fb_blank = uvesafb_blank,
1423 .fb_fillrect = cfb_fillrect,
1424 .fb_copyarea = cfb_copyarea,
1425 .fb_imageblit = cfb_imageblit,
1426 .fb_check_var = uvesafb_check_var,
1427 .fb_set_par = uvesafb_set_par,
1428};
1429
1430static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1431{
1432 unsigned int size_vmode;
1433 unsigned int size_remap;
1434 unsigned int size_total;
1435 struct uvesafb_par *par = info->par;
1436 int i, h;
1437
1438 info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1439 info->fix = uvesafb_fix;
1440 info->fix.ypanstep = par->ypan ? 1 : 0;
1441 info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1442
1443 /* Disable blanking if the user requested so. */
1444 if (!blank)
1445 uvesafb_ops.fb_blank = NULL;
1446
1447 /*
1448 * Find out how much IO memory is required for the mode with
1449 * the highest resolution.
1450 */
1451 size_remap = 0;
1452 for (i = 0; i < par->vbe_modes_cnt; i++) {
1453 h = par->vbe_modes[i].bytes_per_scan_line *
1454 par->vbe_modes[i].y_res;
1455 if (h > size_remap)
1456 size_remap = h;
1457 }
1458 size_remap *= 2;
1459
1460 /*
1461 * size_vmode -- that is the amount of memory needed for the
1462 * used video mode, i.e. the minimum amount of
1463 * memory we need.
1464 */
1465 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1466
1467 /*
1468 * size_total -- all video memory we have. Used for mtrr
1469 * entries, resource allocation and bounds
1470 * checking.
1471 */
1472 size_total = par->vbe_ib.total_memory * 65536;
1473 if (vram_total)
1474 size_total = vram_total * 1024 * 1024;
1475 if (size_total < size_vmode)
1476 size_total = size_vmode;
1477
1478 /*
1479 * size_remap -- the amount of video memory we are going to
1480 * use for vesafb. With modern cards it is no
1481 * option to simply use size_total as th
1482 * wastes plenty of kernel address space.
1483 */
1484 if (vram_remap)
1485 size_remap = vram_remap * 1024 * 1024;
1486 if (size_remap < size_vmode)
1487 size_remap = size_vmode;
1488 if (size_remap > size_total)
1489 size_remap = size_total;
1490
1491 info->fix.smem_len = size_remap;
1492 info->fix.smem_start = mode->phys_base_ptr;
1493
1494 /*
1495 * We have to set yres_virtual here because when setup_var() was
1496 * called, smem_len wasn't defined yet.
1497 */
1498 info->var.yres_virtual = info->fix.smem_len /
1499 mode->bytes_per_scan_line;
1500
1501 if (par->ypan && info->var.yres_virtual > info->var.yres) {
1502 pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1503 (par->ypan > 1) ? "ywrap" : "ypan",
1504 info->var.yres_virtual);
1505 } else {
1506 pr_info("scrolling: redraw\n");
1507 info->var.yres_virtual = info->var.yres;
1508 par->ypan = 0;
1509 }
1510
1511 info->flags = FBINFO_FLAG_DEFAULT |
1512 (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1513
1514 if (!par->ypan)
1515 uvesafb_ops.fb_pan_display = NULL;
1516}
1517
1518static void uvesafb_init_mtrr(struct fb_info *info)
1519{
1520 struct uvesafb_par *par = info->par;
1521
1522 if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1523 int temp_size = info->fix.smem_len;
1524
1525 int rc;
1526
1527 /* Find the largest power-of-two */
1528 temp_size = roundup_pow_of_two(temp_size);
1529
1530 /* Try and find a power of two to add */
1531 do {
1532 rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1533 temp_size >>= 1;
1534 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1535
1536 if (rc >= 0)
1537 par->mtrr_handle = rc;
1538 }
1539}
1540
1541static void uvesafb_ioremap(struct fb_info *info)
1542{
1543 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1544}
1545
1546static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1547 struct device_attribute *attr, char *buf)
1548{
1549 struct fb_info *info = dev_get_drvdata(dev);
1550 struct uvesafb_par *par = info->par;
1551
1552 return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1553}
1554
1555static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1556
1557static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1558 struct device_attribute *attr, char *buf)
1559{
1560 struct fb_info *info = dev_get_drvdata(dev);
1561 struct uvesafb_par *par = info->par;
1562 int ret = 0, i;
1563
1564 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1565 ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1566 "%dx%d-%d, 0x%.4x\n",
1567 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1568 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1569 }
1570
1571 return ret;
1572}
1573
1574static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1575
1576static ssize_t uvesafb_show_vendor(struct device *dev,
1577 struct device_attribute *attr, char *buf)
1578{
1579 struct fb_info *info = dev_get_drvdata(dev);
1580 struct uvesafb_par *par = info->par;
1581
1582 if (par->vbe_ib.oem_vendor_name_ptr)
1583 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1584 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1585 else
1586 return 0;
1587}
1588
1589static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1590
1591static ssize_t uvesafb_show_product_name(struct device *dev,
1592 struct device_attribute *attr, char *buf)
1593{
1594 struct fb_info *info = dev_get_drvdata(dev);
1595 struct uvesafb_par *par = info->par;
1596
1597 if (par->vbe_ib.oem_product_name_ptr)
1598 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1599 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1600 else
1601 return 0;
1602}
1603
1604static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1605
1606static ssize_t uvesafb_show_product_rev(struct device *dev,
1607 struct device_attribute *attr, char *buf)
1608{
1609 struct fb_info *info = dev_get_drvdata(dev);
1610 struct uvesafb_par *par = info->par;
1611
1612 if (par->vbe_ib.oem_product_rev_ptr)
1613 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1614 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1615 else
1616 return 0;
1617}
1618
1619static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1620
1621static ssize_t uvesafb_show_oem_string(struct device *dev,
1622 struct device_attribute *attr, char *buf)
1623{
1624 struct fb_info *info = dev_get_drvdata(dev);
1625 struct uvesafb_par *par = info->par;
1626
1627 if (par->vbe_ib.oem_string_ptr)
1628 return snprintf(buf, PAGE_SIZE, "%s\n",
1629 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1630 else
1631 return 0;
1632}
1633
1634static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1635
1636static ssize_t uvesafb_show_nocrtc(struct device *dev,
1637 struct device_attribute *attr, char *buf)
1638{
1639 struct fb_info *info = dev_get_drvdata(dev);
1640 struct uvesafb_par *par = info->par;
1641
1642 return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1643}
1644
1645static ssize_t uvesafb_store_nocrtc(struct device *dev,
1646 struct device_attribute *attr, const char *buf, size_t count)
1647{
1648 struct fb_info *info = dev_get_drvdata(dev);
1649 struct uvesafb_par *par = info->par;
1650
1651 if (count > 0) {
1652 if (buf[0] == '0')
1653 par->nocrtc = 0;
1654 else
1655 par->nocrtc = 1;
1656 }
1657 return count;
1658}
1659
1660static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1661 uvesafb_store_nocrtc);
1662
1663static struct attribute *uvesafb_dev_attrs[] = {
1664 &dev_attr_vbe_version.attr,
1665 &dev_attr_vbe_modes.attr,
1666 &dev_attr_oem_vendor.attr,
1667 &dev_attr_oem_product_name.attr,
1668 &dev_attr_oem_product_rev.attr,
1669 &dev_attr_oem_string.attr,
1670 &dev_attr_nocrtc.attr,
1671 NULL,
1672};
1673
1674static const struct attribute_group uvesafb_dev_attgrp = {
1675 .name = NULL,
1676 .attrs = uvesafb_dev_attrs,
1677};
1678
1679static int uvesafb_probe(struct platform_device *dev)
1680{
1681 struct fb_info *info;
1682 struct vbe_mode_ib *mode = NULL;
1683 struct uvesafb_par *par;
1684 int err = 0, i;
1685
1686 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1687 if (!info)
1688 return -ENOMEM;
1689
1690 par = info->par;
1691
1692 err = uvesafb_vbe_init(info);
1693 if (err) {
1694 pr_err("vbe_init() failed with %d\n", err);
1695 goto out;
1696 }
1697
1698 info->fbops = &uvesafb_ops;
1699
1700 i = uvesafb_vbe_init_mode(info);
1701 if (i < 0) {
1702 err = -EINVAL;
1703 goto out;
1704 } else {
1705 mode = &par->vbe_modes[i];
1706 }
1707
1708 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1709 err = -ENXIO;
1710 goto out;
1711 }
1712
1713 uvesafb_init_info(info, mode);
1714
1715 if (!request_region(0x3c0, 32, "uvesafb")) {
1716 pr_err("request region 0x3c0-0x3e0 failed\n");
1717 err = -EIO;
1718 goto out_mode;
1719 }
1720
1721 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1722 "uvesafb")) {
1723 pr_err("cannot reserve video memory at 0x%lx\n",
1724 info->fix.smem_start);
1725 err = -EIO;
1726 goto out_reg;
1727 }
1728
1729 uvesafb_init_mtrr(info);
1730 uvesafb_ioremap(info);
1731
1732 if (!info->screen_base) {
1733 pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1734 info->fix.smem_len, info->fix.smem_start);
1735 err = -EIO;
1736 goto out_mem;
1737 }
1738
1739 platform_set_drvdata(dev, info);
1740
1741 if (register_framebuffer(info) < 0) {
1742 pr_err("failed to register framebuffer device\n");
1743 err = -EINVAL;
1744 goto out_unmap;
1745 }
1746
1747 pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1748 info->fix.smem_start, info->screen_base,
1749 info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1750 fb_info(info, "%s frame buffer device\n", info->fix.id);
1751
1752 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1753 if (err != 0)
1754 fb_warn(info, "failed to register attributes\n");
1755
1756 return 0;
1757
1758out_unmap:
1759 iounmap(info->screen_base);
1760out_mem:
1761 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1762out_reg:
1763 release_region(0x3c0, 32);
1764out_mode:
1765 if (!list_empty(&info->modelist))
1766 fb_destroy_modelist(&info->modelist);
1767 fb_destroy_modedb(info->monspecs.modedb);
1768 fb_dealloc_cmap(&info->cmap);
1769out:
1770 kfree(par->vbe_modes);
1771
1772 framebuffer_release(info);
1773 return err;
1774}
1775
1776static int uvesafb_remove(struct platform_device *dev)
1777{
1778 struct fb_info *info = platform_get_drvdata(dev);
1779
1780 if (info) {
1781 struct uvesafb_par *par = info->par;
1782
1783 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1784 unregister_framebuffer(info);
1785 release_region(0x3c0, 32);
1786 iounmap(info->screen_base);
1787 arch_phys_wc_del(par->mtrr_handle);
1788 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1789 fb_destroy_modedb(info->monspecs.modedb);
1790 fb_dealloc_cmap(&info->cmap);
1791
1792 kfree(par->vbe_modes);
1793 kfree(par->vbe_state_orig);
1794 kfree(par->vbe_state_saved);
1795
1796 framebuffer_release(info);
1797 }
1798 return 0;
1799}
1800
1801static struct platform_driver uvesafb_driver = {
1802 .probe = uvesafb_probe,
1803 .remove = uvesafb_remove,
1804 .driver = {
1805 .name = "uvesafb",
1806 },
1807};
1808
1809static struct platform_device *uvesafb_device;
1810
1811#ifndef MODULE
1812static int uvesafb_setup(char *options)
1813{
1814 char *this_opt;
1815
1816 if (!options || !*options)
1817 return 0;
1818
1819 while ((this_opt = strsep(&options, ",")) != NULL) {
1820 if (!*this_opt) continue;
1821
1822 if (!strcmp(this_opt, "redraw"))
1823 ypan = 0;
1824 else if (!strcmp(this_opt, "ypan"))
1825 ypan = 1;
1826 else if (!strcmp(this_opt, "ywrap"))
1827 ypan = 2;
1828 else if (!strcmp(this_opt, "vgapal"))
1829 pmi_setpal = false;
1830 else if (!strcmp(this_opt, "pmipal"))
1831 pmi_setpal = true;
1832 else if (!strncmp(this_opt, "mtrr:", 5))
1833 mtrr = simple_strtoul(this_opt+5, NULL, 0);
1834 else if (!strcmp(this_opt, "nomtrr"))
1835 mtrr = 0;
1836 else if (!strcmp(this_opt, "nocrtc"))
1837 nocrtc = true;
1838 else if (!strcmp(this_opt, "noedid"))
1839 noedid = true;
1840 else if (!strcmp(this_opt, "noblank"))
1841 blank = false;
1842 else if (!strncmp(this_opt, "vtotal:", 7))
1843 vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1844 else if (!strncmp(this_opt, "vremap:", 7))
1845 vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1846 else if (!strncmp(this_opt, "maxhf:", 6))
1847 maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1848 else if (!strncmp(this_opt, "maxvf:", 6))
1849 maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1850 else if (!strncmp(this_opt, "maxclk:", 7))
1851 maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1852 else if (!strncmp(this_opt, "vbemode:", 8))
1853 vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1854 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1855 mode_option = this_opt;
1856 } else {
1857 pr_warn("unrecognized option %s\n", this_opt);
1858 }
1859 }
1860
1861 if (mtrr != 3 && mtrr != 0)
1862 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1863
1864 return 0;
1865}
1866#endif /* !MODULE */
1867
1868static ssize_t v86d_show(struct device_driver *dev, char *buf)
1869{
1870 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1871}
1872
1873static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1874 size_t count)
1875{
1876 strncpy(v86d_path, buf, PATH_MAX - 1);
1877 return count;
1878}
1879static DRIVER_ATTR_RW(v86d);
1880
1881static int uvesafb_init(void)
1882{
1883 int err;
1884
1885#ifndef MODULE
1886 char *option = NULL;
1887
1888 if (fb_get_options("uvesafb", &option))
1889 return -ENODEV;
1890 uvesafb_setup(option);
1891#endif
1892 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1893 if (err)
1894 return err;
1895
1896 err = platform_driver_register(&uvesafb_driver);
1897
1898 if (!err) {
1899 uvesafb_device = platform_device_alloc("uvesafb", 0);
1900 if (uvesafb_device)
1901 err = platform_device_add(uvesafb_device);
1902 else
1903 err = -ENOMEM;
1904
1905 if (err) {
1906 platform_device_put(uvesafb_device);
1907 platform_driver_unregister(&uvesafb_driver);
1908 cn_del_callback(&uvesafb_cn_id);
1909 return err;
1910 }
1911
1912 err = driver_create_file(&uvesafb_driver.driver,
1913 &driver_attr_v86d);
1914 if (err) {
1915 pr_warn("failed to register attributes\n");
1916 err = 0;
1917 }
1918 }
1919 return err;
1920}
1921
1922module_init(uvesafb_init);
1923
1924static void uvesafb_exit(void)
1925{
1926 struct uvesafb_ktask *task;
1927
1928 if (v86d_started) {
1929 task = uvesafb_prep();
1930 if (task) {
1931 task->t.flags = TF_EXIT;
1932 uvesafb_exec(task);
1933 uvesafb_free(task);
1934 }
1935 }
1936
1937 cn_del_callback(&uvesafb_cn_id);
1938 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1939 platform_device_unregister(uvesafb_device);
1940 platform_driver_unregister(&uvesafb_driver);
1941}
1942
1943module_exit(uvesafb_exit);
1944
1945static int param_set_scroll(const char *val, const struct kernel_param *kp)
1946{
1947 ypan = 0;
1948
1949 if (!strcmp(val, "redraw"))
1950 ypan = 0;
1951 else if (!strcmp(val, "ypan"))
1952 ypan = 1;
1953 else if (!strcmp(val, "ywrap"))
1954 ypan = 2;
1955 else
1956 return -EINVAL;
1957
1958 return 0;
1959}
1960static const struct kernel_param_ops param_ops_scroll = {
1961 .set = param_set_scroll,
1962};
1963#define param_check_scroll(name, p) __param_check(name, p, void)
1964
1965module_param_named(scroll, ypan, scroll, 0);
1966MODULE_PARM_DESC(scroll,
1967 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1968module_param_named(vgapal, pmi_setpal, invbool, 0);
1969MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1970module_param_named(pmipal, pmi_setpal, bool, 0);
1971MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1972module_param(mtrr, uint, 0);
1973MODULE_PARM_DESC(mtrr,
1974 "Memory Type Range Registers setting. Use 0 to disable.");
1975module_param(blank, bool, 0);
1976MODULE_PARM_DESC(blank, "Enable hardware blanking");
1977module_param(nocrtc, bool, 0);
1978MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1979module_param(noedid, bool, 0);
1980MODULE_PARM_DESC(noedid,
1981 "Ignore EDID-provided monitor limits when setting modes");
1982module_param(vram_remap, uint, 0);
1983MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1984module_param(vram_total, uint, 0);
1985MODULE_PARM_DESC(vram_total, "Set total amount of video memory [MiB]");
1986module_param(maxclk, ushort, 0);
1987MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1988module_param(maxhf, ushort, 0);
1989MODULE_PARM_DESC(maxhf,
1990 "Maximum horizontal frequency [kHz], overrides EDID data");
1991module_param(maxvf, ushort, 0);
1992MODULE_PARM_DESC(maxvf,
1993 "Maximum vertical frequency [Hz], overrides EDID data");
1994module_param(mode_option, charp, 0);
1995MODULE_PARM_DESC(mode_option,
1996 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1997module_param(vbemode, ushort, 0);
1998MODULE_PARM_DESC(vbemode,
1999 "VBE mode number to set, overrides the 'mode' option");
2000module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2001MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2002
2003MODULE_LICENSE("GPL");
2004MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2005MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2006
2007

source code of linux/drivers/video/fbdev/uvesafb.c