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cxl: Fix typo in debug print
[linux/fpc-iii.git] / drivers / video / fbdev / uvesafb.c
blobd32d1c4d1b99f81a1962bb92bf7cc6b3e1ad77ff
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 #include <linux/init.h>
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/skbuff.h>
12 #include <linux/timer.h>
13 #include <linux/completion.h>
14 #include <linux/connector.h>
15 #include <linux/random.h>
16 #include <linux/platform_device.h>
17 #include <linux/limits.h>
18 #include <linux/fb.h>
19 #include <linux/io.h>
20 #include <linux/mutex.h>
21 #include <linux/slab.h>
22 #include <video/edid.h>
23 #include <video/uvesafb.h>
24 #ifdef CONFIG_X86
25 #include <video/vga.h>
26 #endif
27 #include "edid.h"
28
29 static struct cb_id uvesafb_cn_id = {
30 .idx = CN_IDX_V86D,
31 .val = CN_VAL_V86D_UVESAFB
32 };
33 static char v86d_path[PATH_MAX] = "/sbin/v86d";
34 static char v86d_started; /* has v86d been started by uvesafb? */
35
36 static struct fb_fix_screeninfo uvesafb_fix = {
37 .id = "VESA VGA",
38 .type = FB_TYPE_PACKED_PIXELS,
39 .accel = FB_ACCEL_NONE,
40 .visual = FB_VISUAL_TRUECOLOR,
41 };
42
43 static int mtrr = 3; /* enable mtrr by default */
44 static bool blank = 1; /* enable blanking by default */
45 static int ypan = 1; /* 0: scroll, 1: ypan, 2: ywrap */
46 static bool pmi_setpal = true; /* use PMI for palette changes */
47 static bool nocrtc; /* ignore CRTC settings */
48 static bool noedid; /* don't try DDC transfers */
49 static int vram_remap; /* set amt. of memory to be used */
50 static int vram_total; /* set total amount of memory */
51 static u16 maxclk; /* maximum pixel clock */
52 static u16 maxvf; /* maximum vertical frequency */
53 static u16 maxhf; /* maximum horizontal frequency */
54 static u16 vbemode; /* force use of a specific VBE mode */
55 static char *mode_option;
56 static u8 dac_width = 6;
57
58 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
59 static DEFINE_MUTEX(uvfb_lock);
60
61 /*
62 * A handler for replies from userspace.
63 *
64 * Make sure each message passes consistency checks and if it does,
65 * find the kernel part of the task struct, copy the registers and
66 * the buffer contents and then complete the task.
67 */
68 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
69 {
70 struct uvesafb_task *utask;
71 struct uvesafb_ktask *task;
72
73 if (!capable(CAP_SYS_ADMIN))
74 return;
75
76 if (msg->seq >= UVESAFB_TASKS_MAX)
77 return;
78
79 mutex_lock(&uvfb_lock);
80 task = uvfb_tasks[msg->seq];
81
82 if (!task || msg->ack != task->ack) {
83 mutex_unlock(&uvfb_lock);
84 return;
85 }
86
87 utask = (struct uvesafb_task *)msg->data;
88
89 /* Sanity checks for the buffer length. */
90 if (task->t.buf_len < utask->buf_len ||
91 utask->buf_len > msg->len - sizeof(*utask)) {
92 mutex_unlock(&uvfb_lock);
93 return;
94 }
95
96 uvfb_tasks[msg->seq] = NULL;
97 mutex_unlock(&uvfb_lock);
98
99 memcpy(&task->t, utask, sizeof(*utask));
100
101 if (task->t.buf_len && task->buf)
102 memcpy(task->buf, utask + 1, task->t.buf_len);
103
104 complete(task->done);
105 return;
106 }
107
108 static int uvesafb_helper_start(void)
109 {
110 char *envp[] = {
111 "HOME=/",
112 "PATH=/sbin:/bin",
113 NULL,
114 };
115
116 char *argv[] = {
117 v86d_path,
118 NULL,
119 };
120
121 return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
122 }
123
124 /*
125 * Execute a uvesafb task.
126 *
127 * Returns 0 if the task is executed successfully.
128 *
129 * A message sent to the userspace consists of the uvesafb_task
130 * struct and (optionally) a buffer. The uvesafb_task struct is
131 * a simplified version of uvesafb_ktask (its kernel counterpart)
132 * containing only the register values, flags and the length of
133 * the buffer.
134 *
135 * Each message is assigned a sequence number (increased linearly)
136 * and a random ack number. The sequence number is used as a key
137 * for the uvfb_tasks array which holds pointers to uvesafb_ktask
138 * structs for all requests.
139 */
140 static int uvesafb_exec(struct uvesafb_ktask *task)
141 {
142 static int seq;
143 struct cn_msg *m;
144 int err;
145 int len = sizeof(task->t) + task->t.buf_len;
146
147 /*
148 * Check whether the message isn't longer than the maximum
149 * allowed by connector.
150 */
151 if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
152 printk(KERN_WARNING "uvesafb: message too long (%d), "
153 "can't execute task\n", (int)(sizeof(*m) + len));
154 return -E2BIG;
155 }
156
157 m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
158 if (!m)
159 return -ENOMEM;
160
161 init_completion(task->done);
162
163 memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
164 m->seq = seq;
165 m->len = len;
166 m->ack = prandom_u32();
167
168 /* uvesafb_task structure */
169 memcpy(m + 1, &task->t, sizeof(task->t));
170
171 /* Buffer */
172 memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
173
174 /*
175 * Save the message ack number so that we can find the kernel
176 * part of this task when a reply is received from userspace.
177 */
178 task->ack = m->ack;
179
180 mutex_lock(&uvfb_lock);
181
182 /* If all slots are taken -- bail out. */
183 if (uvfb_tasks[seq]) {
184 mutex_unlock(&uvfb_lock);
185 err = -EBUSY;
186 goto out;
187 }
188
189 /* Save a pointer to the kernel part of the task struct. */
190 uvfb_tasks[seq] = task;
191 mutex_unlock(&uvfb_lock);
192
193 err = cn_netlink_send(m, 0, 0, GFP_KERNEL);
194 if (err == -ESRCH) {
195 /*
196 * Try to start the userspace helper if sending
197 * the request failed the first time.
198 */
199 err = uvesafb_helper_start();
200 if (err) {
201 printk(KERN_ERR "uvesafb: failed to execute %s\n",
202 v86d_path);
203 printk(KERN_ERR "uvesafb: make sure that the v86d "
204 "helper is installed and executable\n");
205 } else {
206 v86d_started = 1;
207 err = cn_netlink_send(m, 0, 0, gfp_any());
208 if (err == -ENOBUFS)
209 err = 0;
210 }
211 } else if (err == -ENOBUFS)
212 err = 0;
213
214 if (!err && !(task->t.flags & TF_EXIT))
215 err = !wait_for_completion_timeout(task->done,
216 msecs_to_jiffies(UVESAFB_TIMEOUT));
217
218 mutex_lock(&uvfb_lock);
219 uvfb_tasks[seq] = NULL;
220 mutex_unlock(&uvfb_lock);
221
222 seq++;
223 if (seq >= UVESAFB_TASKS_MAX)
224 seq = 0;
225 out:
226 kfree(m);
227 return err;
228 }
229
230 /*
231 * Free a uvesafb_ktask struct.
232 */
233 static void uvesafb_free(struct uvesafb_ktask *task)
234 {
235 if (task) {
236 kfree(task->done);
237 kfree(task);
238 }
239 }
240
241 /*
242 * Prepare a uvesafb_ktask struct to be used again.
243 */
244 static void uvesafb_reset(struct uvesafb_ktask *task)
245 {
246 struct completion *cpl = task->done;
247
248 memset(task, 0, sizeof(*task));
249 task->done = cpl;
250 }
251
252 /*
253 * Allocate and prepare a uvesafb_ktask struct.
254 */
255 static struct uvesafb_ktask *uvesafb_prep(void)
256 {
257 struct uvesafb_ktask *task;
258
259 task = kzalloc(sizeof(*task), GFP_KERNEL);
260 if (task) {
261 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
262 if (!task->done) {
263 kfree(task);
264 task = NULL;
265 }
266 }
267 return task;
268 }
269
270 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
271 struct fb_info *info, struct vbe_mode_ib *mode)
272 {
273 struct uvesafb_par *par = info->par;
274
275 var->vmode = FB_VMODE_NONINTERLACED;
276 var->sync = FB_SYNC_VERT_HIGH_ACT;
277
278 var->xres = mode->x_res;
279 var->yres = mode->y_res;
280 var->xres_virtual = mode->x_res;
281 var->yres_virtual = (par->ypan) ?
282 info->fix.smem_len / mode->bytes_per_scan_line :
283 mode->y_res;
284 var->xoffset = 0;
285 var->yoffset = 0;
286 var->bits_per_pixel = mode->bits_per_pixel;
287
288 if (var->bits_per_pixel == 15)
289 var->bits_per_pixel = 16;
290
291 if (var->bits_per_pixel > 8) {
292 var->red.offset = mode->red_off;
293 var->red.length = mode->red_len;
294 var->green.offset = mode->green_off;
295 var->green.length = mode->green_len;
296 var->blue.offset = mode->blue_off;
297 var->blue.length = mode->blue_len;
298 var->transp.offset = mode->rsvd_off;
299 var->transp.length = mode->rsvd_len;
300 } else {
301 var->red.offset = 0;
302 var->green.offset = 0;
303 var->blue.offset = 0;
304 var->transp.offset = 0;
305
306 var->red.length = 8;
307 var->green.length = 8;
308 var->blue.length = 8;
309 var->transp.length = 0;
310 }
311 }
312
313 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
314 int xres, int yres, int depth, unsigned char flags)
315 {
316 int i, match = -1, h = 0, d = 0x7fffffff;
317
318 for (i = 0; i < par->vbe_modes_cnt; i++) {
319 h = abs(par->vbe_modes[i].x_res - xres) +
320 abs(par->vbe_modes[i].y_res - yres) +
321 abs(depth - par->vbe_modes[i].depth);
322
323 /*
324 * We have an exact match in terms of resolution
325 * and depth.
326 */
327 if (h == 0)
328 return i;
329
330 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
331 d = h;
332 match = i;
333 }
334 }
335 i = 1;
336
337 if (flags & UVESAFB_EXACT_DEPTH &&
338 par->vbe_modes[match].depth != depth)
339 i = 0;
340
341 if (flags & UVESAFB_EXACT_RES && d > 24)
342 i = 0;
343
344 if (i != 0)
345 return match;
346 else
347 return -1;
348 }
349
350 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
351 {
352 struct uvesafb_ktask *task;
353 u8 *state;
354 int err;
355
356 if (!par->vbe_state_size)
357 return NULL;
358
359 state = kmalloc(par->vbe_state_size, GFP_KERNEL);
360 if (!state)
361 return ERR_PTR(-ENOMEM);
362
363 task = uvesafb_prep();
364 if (!task) {
365 kfree(state);
366 return NULL;
367 }
368
369 task->t.regs.eax = 0x4f04;
370 task->t.regs.ecx = 0x000f;
371 task->t.regs.edx = 0x0001;
372 task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
373 task->t.buf_len = par->vbe_state_size;
374 task->buf = state;
375 err = uvesafb_exec(task);
376
377 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
378 printk(KERN_WARNING "uvesafb: VBE get state call "
379 "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 printk(KERN_WARNING "uvesafb: VBE state restore call "
411 "failed (eax=0x%x, err=%d)\n",
412 task->t.regs.eax, err);
413
414 uvesafb_free(task);
415 }
416
417 static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
418 struct uvesafb_par *par)
419 {
420 int err;
421
422 task->t.regs.eax = 0x4f00;
423 task->t.flags = TF_VBEIB;
424 task->t.buf_len = sizeof(struct vbe_ib);
425 task->buf = &par->vbe_ib;
426 strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
427
428 err = uvesafb_exec(task);
429 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
430 printk(KERN_ERR "uvesafb: Getting VBE info block failed "
431 "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
432 err);
433 return -EINVAL;
434 }
435
436 if (par->vbe_ib.vbe_version < 0x0200) {
437 printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
438 "not supported.\n");
439 return -EINVAL;
440 }
441
442 if (!par->vbe_ib.mode_list_ptr) {
443 printk(KERN_ERR "uvesafb: Missing mode list!\n");
444 return -EINVAL;
445 }
446
447 printk(KERN_INFO "uvesafb: ");
448
449 /*
450 * Convert string pointers and the mode list pointer into
451 * usable addresses. Print informational messages about the
452 * video adapter and its vendor.
453 */
454 if (par->vbe_ib.oem_vendor_name_ptr)
455 printk("%s, ",
456 ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
457
458 if (par->vbe_ib.oem_product_name_ptr)
459 printk("%s, ",
460 ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
461
462 if (par->vbe_ib.oem_product_rev_ptr)
463 printk("%s, ",
464 ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
465
466 if (par->vbe_ib.oem_string_ptr)
467 printk("OEM: %s, ",
468 ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
469
470 printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
471 par->vbe_ib.vbe_version & 0xff);
472
473 return 0;
474 }
475
476 static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
477 struct uvesafb_par *par)
478 {
479 int off = 0, err;
480 u16 *mode;
481
482 par->vbe_modes_cnt = 0;
483
484 /* Count available modes. */
485 mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
486 while (*mode != 0xffff) {
487 par->vbe_modes_cnt++;
488 mode++;
489 }
490
491 par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
492 par->vbe_modes_cnt, 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 printk(KERN_WARNING "uvesafb: Getting mode info block "
511 "for mode 0x%x failed (eax=0x%x, err=%d)\n",
512 *mode, (u32)task->t.regs.eax, err);
513 mode++;
514 par->vbe_modes_cnt--;
515 continue;
516 }
517
518 mib = task->buf;
519 mib->mode_id = *mode;
520
521 /*
522 * We only want modes that are supported with the current
523 * hardware configuration, color, graphics and that have
524 * support for the LFB.
525 */
526 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
527 mib->bits_per_pixel >= 8)
528 off++;
529 else
530 par->vbe_modes_cnt--;
531
532 mode++;
533 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
534
535 /*
536 * Handle 8bpp modes and modes with broken color component
537 * lengths.
538 */
539 if (mib->depth == 0 || (mib->depth == 24 &&
540 mib->bits_per_pixel == 32))
541 mib->depth = mib->bits_per_pixel;
542 }
543
544 if (par->vbe_modes_cnt > 0)
545 return 0;
546 else
547 return -EINVAL;
548 }
549
550 /*
551 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
552 * x86 and not x86_64.
553 */
554 #ifdef CONFIG_X86_32
555 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
556 struct uvesafb_par *par)
557 {
558 int i, err;
559
560 uvesafb_reset(task);
561 task->t.regs.eax = 0x4f0a;
562 task->t.regs.ebx = 0x0;
563 err = uvesafb_exec(task);
564
565 if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
566 par->pmi_setpal = par->ypan = 0;
567 } else {
568 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
569 + task->t.regs.edi);
570 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
571 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
572 printk(KERN_INFO "uvesafb: protected mode interface info at "
573 "%04x:%04x\n",
574 (u16)task->t.regs.es, (u16)task->t.regs.edi);
575 printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
576 "set palette = %p\n", par->pmi_start,
577 par->pmi_pal);
578
579 if (par->pmi_base[3]) {
580 printk(KERN_INFO "uvesafb: pmi: ports = ");
581 for (i = par->pmi_base[3]/2;
582 par->pmi_base[i] != 0xffff; i++)
583 printk("%x ", par->pmi_base[i]);
584 printk("\n");
585
586 if (par->pmi_base[i] != 0xffff) {
587 printk(KERN_INFO "uvesafb: can't handle memory"
588 " requests, pmi disabled\n");
589 par->ypan = par->pmi_setpal = 0;
590 }
591 }
592 }
593 return 0;
594 }
595 #endif /* CONFIG_X86_32 */
596
597 /*
598 * Check whether a video mode is supported by the Video BIOS and is
599 * compatible with the monitor limits.
600 */
601 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
602 struct fb_info *info)
603 {
604 if (info->monspecs.gtf) {
605 fb_videomode_to_var(&info->var, mode);
606 if (fb_validate_mode(&info->var, info))
607 return 0;
608 }
609
610 if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
611 UVESAFB_EXACT_RES) == -1)
612 return 0;
613
614 return 1;
615 }
616
617 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
618 {
619 struct uvesafb_par *par = info->par;
620 int err = 0;
621
622 if (noedid || par->vbe_ib.vbe_version < 0x0300)
623 return -EINVAL;
624
625 task->t.regs.eax = 0x4f15;
626 task->t.regs.ebx = 0;
627 task->t.regs.ecx = 0;
628 task->t.buf_len = 0;
629 task->t.flags = 0;
630
631 err = uvesafb_exec(task);
632
633 if ((task->t.regs.eax & 0xffff) != 0x004f || err)
634 return -EINVAL;
635
636 if ((task->t.regs.ebx & 0x3) == 3) {
637 printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
638 "DDC1 and DDC2 transfers\n");
639 } else if ((task->t.regs.ebx & 0x3) == 2) {
640 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
641 "transfers\n");
642 } else if ((task->t.regs.ebx & 0x3) == 1) {
643 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
644 "transfers\n");
645 } else {
646 printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
647 "DDC transfers\n");
648 return -EINVAL;
649 }
650
651 task->t.regs.eax = 0x4f15;
652 task->t.regs.ebx = 1;
653 task->t.regs.ecx = task->t.regs.edx = 0;
654 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
655 task->t.buf_len = EDID_LENGTH;
656 task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
657 if (!task->buf)
658 return -ENOMEM;
659
660 err = uvesafb_exec(task);
661
662 if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
663 fb_edid_to_monspecs(task->buf, &info->monspecs);
664
665 if (info->monspecs.vfmax && info->monspecs.hfmax) {
666 /*
667 * If the maximum pixel clock wasn't specified in
668 * the EDID block, set it to 300 MHz.
669 */
670 if (info->monspecs.dclkmax == 0)
671 info->monspecs.dclkmax = 300 * 1000000;
672 info->monspecs.gtf = 1;
673 }
674 } else {
675 err = -EINVAL;
676 }
677
678 kfree(task->buf);
679 return err;
680 }
681
682 static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
683 struct fb_info *info)
684 {
685 struct uvesafb_par *par = info->par;
686 int i;
687
688 memset(&info->monspecs, 0, sizeof(info->monspecs));
689
690 /*
691 * If we don't get all necessary data from the EDID block,
692 * mark it as incompatible with the GTF and set nocrtc so
693 * that we always use the default BIOS refresh rate.
694 */
695 if (uvesafb_vbe_getedid(task, info)) {
696 info->monspecs.gtf = 0;
697 par->nocrtc = 1;
698 }
699
700 /* Kernel command line overrides. */
701 if (maxclk)
702 info->monspecs.dclkmax = maxclk * 1000000;
703 if (maxvf)
704 info->monspecs.vfmax = maxvf;
705 if (maxhf)
706 info->monspecs.hfmax = maxhf * 1000;
707
708 /*
709 * In case DDC transfers are not supported, the user can provide
710 * monitor limits manually. Lower limits are set to "safe" values.
711 */
712 if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
713 info->monspecs.dclkmin = 0;
714 info->monspecs.vfmin = 60;
715 info->monspecs.hfmin = 29000;
716 info->monspecs.gtf = 1;
717 par->nocrtc = 0;
718 }
719
720 if (info->monspecs.gtf)
721 printk(KERN_INFO
722 "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
723 "clk = %d MHz\n", info->monspecs.vfmax,
724 (int)(info->monspecs.hfmax / 1000),
725 (int)(info->monspecs.dclkmax / 1000000));
726 else
727 printk(KERN_INFO "uvesafb: no monitor limits have been set, "
728 "default refresh rate will be used\n");
729
730 /* Add VBE modes to the modelist. */
731 for (i = 0; i < par->vbe_modes_cnt; i++) {
732 struct fb_var_screeninfo var;
733 struct vbe_mode_ib *mode;
734 struct fb_videomode vmode;
735
736 mode = &par->vbe_modes[i];
737 memset(&var, 0, sizeof(var));
738
739 var.xres = mode->x_res;
740 var.yres = mode->y_res;
741
742 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
743 fb_var_to_videomode(&vmode, &var);
744 fb_add_videomode(&vmode, &info->modelist);
745 }
746
747 /* Add valid VESA modes to our modelist. */
748 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
749 if (uvesafb_is_valid_mode((struct fb_videomode *)
750 &vesa_modes[i], info))
751 fb_add_videomode(&vesa_modes[i], &info->modelist);
752 }
753
754 for (i = 0; i < info->monspecs.modedb_len; i++) {
755 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
756 fb_add_videomode(&info->monspecs.modedb[i],
757 &info->modelist);
758 }
759
760 return;
761 }
762
763 static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
764 struct uvesafb_par *par)
765 {
766 int err;
767
768 uvesafb_reset(task);
769
770 /*
771 * Get the VBE state buffer size. We want all available
772 * hardware state data (CL = 0x0f).
773 */
774 task->t.regs.eax = 0x4f04;
775 task->t.regs.ecx = 0x000f;
776 task->t.regs.edx = 0x0000;
777 task->t.flags = 0;
778
779 err = uvesafb_exec(task);
780
781 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
782 printk(KERN_WARNING "uvesafb: VBE state buffer size "
783 "cannot be determined (eax=0x%x, err=%d)\n",
784 task->t.regs.eax, err);
785 par->vbe_state_size = 0;
786 return;
787 }
788
789 par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
790 }
791
792 static int uvesafb_vbe_init(struct fb_info *info)
793 {
794 struct uvesafb_ktask *task = NULL;
795 struct uvesafb_par *par = info->par;
796 int err;
797
798 task = uvesafb_prep();
799 if (!task)
800 return -ENOMEM;
801
802 err = uvesafb_vbe_getinfo(task, par);
803 if (err)
804 goto out;
805
806 err = uvesafb_vbe_getmodes(task, par);
807 if (err)
808 goto out;
809
810 par->nocrtc = nocrtc;
811 #ifdef CONFIG_X86_32
812 par->pmi_setpal = pmi_setpal;
813 par->ypan = ypan;
814
815 if (par->pmi_setpal || par->ypan) {
816 if (__supported_pte_mask & _PAGE_NX) {
817 par->pmi_setpal = par->ypan = 0;
818 printk(KERN_WARNING "uvesafb: NX protection is active, "
819 "better not use the PMI.\n");
820 } else {
821 uvesafb_vbe_getpmi(task, par);
822 }
823 }
824 #else
825 /* The protected mode interface is not available on non-x86. */
826 par->pmi_setpal = par->ypan = 0;
827 #endif
828
829 INIT_LIST_HEAD(&info->modelist);
830 uvesafb_vbe_getmonspecs(task, info);
831 uvesafb_vbe_getstatesize(task, par);
832
833 out: uvesafb_free(task);
834 return err;
835 }
836
837 static int uvesafb_vbe_init_mode(struct fb_info *info)
838 {
839 struct list_head *pos;
840 struct fb_modelist *modelist;
841 struct fb_videomode *mode;
842 struct uvesafb_par *par = info->par;
843 int i, modeid;
844
845 /* Has the user requested a specific VESA mode? */
846 if (vbemode) {
847 for (i = 0; i < par->vbe_modes_cnt; i++) {
848 if (par->vbe_modes[i].mode_id == vbemode) {
849 modeid = i;
850 uvesafb_setup_var(&info->var, info,
851 &par->vbe_modes[modeid]);
852 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
853 &info->var, info);
854 /*
855 * With pixclock set to 0, the default BIOS
856 * timings will be used in set_par().
857 */
858 info->var.pixclock = 0;
859 goto gotmode;
860 }
861 }
862 printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
863 "unavailable\n", vbemode);
864 vbemode = 0;
865 }
866
867 /* Count the modes in the modelist */
868 i = 0;
869 list_for_each(pos, &info->modelist)
870 i++;
871
872 /*
873 * Convert the modelist into a modedb so that we can use it with
874 * fb_find_mode().
875 */
876 mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
877 if (mode) {
878 i = 0;
879 list_for_each(pos, &info->modelist) {
880 modelist = list_entry(pos, struct fb_modelist, list);
881 mode[i] = modelist->mode;
882 i++;
883 }
884
885 if (!mode_option)
886 mode_option = UVESAFB_DEFAULT_MODE;
887
888 i = fb_find_mode(&info->var, info, mode_option, mode, i,
889 NULL, 8);
890
891 kfree(mode);
892 }
893
894 /* fb_find_mode() failed */
895 if (i == 0) {
896 info->var.xres = 640;
897 info->var.yres = 480;
898 mode = (struct fb_videomode *)
899 fb_find_best_mode(&info->var, &info->modelist);
900
901 if (mode) {
902 fb_videomode_to_var(&info->var, mode);
903 } else {
904 modeid = par->vbe_modes[0].mode_id;
905 uvesafb_setup_var(&info->var, info,
906 &par->vbe_modes[modeid]);
907 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
908 &info->var, info);
909
910 goto gotmode;
911 }
912 }
913
914 /* Look for a matching VBE mode. */
915 modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
916 info->var.bits_per_pixel, UVESAFB_EXACT_RES);
917
918 if (modeid == -1)
919 return -EINVAL;
920
921 uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
922
923 gotmode:
924 /*
925 * If we are not VBE3.0+ compliant, we're done -- the BIOS will
926 * ignore our timings anyway.
927 */
928 if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
929 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
930 &info->var, info);
931
932 return modeid;
933 }
934
935 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
936 int start, struct fb_info *info)
937 {
938 struct uvesafb_ktask *task;
939 #ifdef CONFIG_X86
940 struct uvesafb_par *par = info->par;
941 int i = par->mode_idx;
942 #endif
943 int err = 0;
944
945 /*
946 * We support palette modifications for 8 bpp modes only, so
947 * there can never be more than 256 entries.
948 */
949 if (start + count > 256)
950 return -EINVAL;
951
952 #ifdef CONFIG_X86
953 /* Use VGA registers if mode is VGA-compatible. */
954 if (i >= 0 && i < par->vbe_modes_cnt &&
955 par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
956 for (i = 0; i < count; i++) {
957 outb_p(start + i, dac_reg);
958 outb_p(entries[i].red, dac_val);
959 outb_p(entries[i].green, dac_val);
960 outb_p(entries[i].blue, dac_val);
961 }
962 }
963 #ifdef CONFIG_X86_32
964 else if (par->pmi_setpal) {
965 __asm__ __volatile__(
966 "call *(%%esi)"
967 : /* no return value */
968 : "a" (0x4f09), /* EAX */
969 "b" (0), /* EBX */
970 "c" (count), /* ECX */
971 "d" (start), /* EDX */
972 "D" (entries), /* EDI */
973 "S" (&par->pmi_pal)); /* ESI */
974 }
975 #endif /* CONFIG_X86_32 */
976 else
977 #endif /* CONFIG_X86 */
978 {
979 task = uvesafb_prep();
980 if (!task)
981 return -ENOMEM;
982
983 task->t.regs.eax = 0x4f09;
984 task->t.regs.ebx = 0x0;
985 task->t.regs.ecx = count;
986 task->t.regs.edx = start;
987 task->t.flags = TF_BUF_ESDI;
988 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
989 task->buf = entries;
990
991 err = uvesafb_exec(task);
992 if ((task->t.regs.eax & 0xffff) != 0x004f)
993 err = 1;
994
995 uvesafb_free(task);
996 }
997 return err;
998 }
999
1000 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
1001 unsigned blue, unsigned transp,
1002 struct fb_info *info)
1003 {
1004 struct uvesafb_pal_entry entry;
1005 int shift = 16 - dac_width;
1006 int err = 0;
1007
1008 if (regno >= info->cmap.len)
1009 return -EINVAL;
1010
1011 if (info->var.bits_per_pixel == 8) {
1012 entry.red = red >> shift;
1013 entry.green = green >> shift;
1014 entry.blue = blue >> shift;
1015 entry.pad = 0;
1016
1017 err = uvesafb_setpalette(&entry, 1, regno, info);
1018 } else if (regno < 16) {
1019 switch (info->var.bits_per_pixel) {
1020 case 16:
1021 if (info->var.red.offset == 10) {
1022 /* 1:5:5:5 */
1023 ((u32 *) (info->pseudo_palette))[regno] =
1024 ((red & 0xf800) >> 1) |
1025 ((green & 0xf800) >> 6) |
1026 ((blue & 0xf800) >> 11);
1027 } else {
1028 /* 0:5:6:5 */
1029 ((u32 *) (info->pseudo_palette))[regno] =
1030 ((red & 0xf800) ) |
1031 ((green & 0xfc00) >> 5) |
1032 ((blue & 0xf800) >> 11);
1033 }
1034 break;
1035
1036 case 24:
1037 case 32:
1038 red >>= 8;
1039 green >>= 8;
1040 blue >>= 8;
1041 ((u32 *)(info->pseudo_palette))[regno] =
1042 (red << info->var.red.offset) |
1043 (green << info->var.green.offset) |
1044 (blue << info->var.blue.offset);
1045 break;
1046 }
1047 }
1048 return err;
1049 }
1050
1051 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1052 {
1053 struct uvesafb_pal_entry *entries;
1054 int shift = 16 - dac_width;
1055 int i, err = 0;
1056
1057 if (info->var.bits_per_pixel == 8) {
1058 if (cmap->start + cmap->len > info->cmap.start +
1059 info->cmap.len || cmap->start < info->cmap.start)
1060 return -EINVAL;
1061
1062 entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1063 if (!entries)
1064 return -ENOMEM;
1065
1066 for (i = 0; i < cmap->len; i++) {
1067 entries[i].red = cmap->red[i] >> shift;
1068 entries[i].green = cmap->green[i] >> shift;
1069 entries[i].blue = cmap->blue[i] >> shift;
1070 entries[i].pad = 0;
1071 }
1072 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1073 kfree(entries);
1074 } else {
1075 /*
1076 * For modes with bpp > 8, we only set the pseudo palette in
1077 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1078 * sanity checking.
1079 */
1080 for (i = 0; i < cmap->len; i++) {
1081 err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1082 cmap->green[i], cmap->blue[i],
1083 0, info);
1084 }
1085 }
1086 return err;
1087 }
1088
1089 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1090 struct fb_info *info)
1091 {
1092 #ifdef CONFIG_X86_32
1093 int offset;
1094 struct uvesafb_par *par = info->par;
1095
1096 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1097
1098 /*
1099 * It turns out it's not the best idea to do panning via vm86,
1100 * so we only allow it if we have a PMI.
1101 */
1102 if (par->pmi_start) {
1103 __asm__ __volatile__(
1104 "call *(%%edi)"
1105 : /* no return value */
1106 : "a" (0x4f07), /* EAX */
1107 "b" (0), /* EBX */
1108 "c" (offset), /* ECX */
1109 "d" (offset >> 16), /* EDX */
1110 "D" (&par->pmi_start)); /* EDI */
1111 }
1112 #endif
1113 return 0;
1114 }
1115
1116 static int uvesafb_blank(int blank, struct fb_info *info)
1117 {
1118 struct uvesafb_ktask *task;
1119 int err = 1;
1120 #ifdef CONFIG_X86
1121 struct uvesafb_par *par = info->par;
1122
1123 if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1124 int loop = 10000;
1125 u8 seq = 0, crtc17 = 0;
1126
1127 if (blank == FB_BLANK_POWERDOWN) {
1128 seq = 0x20;
1129 crtc17 = 0x00;
1130 err = 0;
1131 } else {
1132 seq = 0x00;
1133 crtc17 = 0x80;
1134 err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1135 }
1136
1137 vga_wseq(NULL, 0x00, 0x01);
1138 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1139 vga_wseq(NULL, 0x00, seq);
1140
1141 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1142 while (loop--);
1143 vga_wcrt(NULL, 0x17, crtc17);
1144 vga_wseq(NULL, 0x00, 0x03);
1145 } else
1146 #endif /* CONFIG_X86 */
1147 {
1148 task = uvesafb_prep();
1149 if (!task)
1150 return -ENOMEM;
1151
1152 task->t.regs.eax = 0x4f10;
1153 switch (blank) {
1154 case FB_BLANK_UNBLANK:
1155 task->t.regs.ebx = 0x0001;
1156 break;
1157 case FB_BLANK_NORMAL:
1158 task->t.regs.ebx = 0x0101; /* standby */
1159 break;
1160 case FB_BLANK_POWERDOWN:
1161 task->t.regs.ebx = 0x0401; /* powerdown */
1162 break;
1163 default:
1164 goto out;
1165 }
1166
1167 err = uvesafb_exec(task);
1168 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1169 err = 1;
1170 out: uvesafb_free(task);
1171 }
1172 return err;
1173 }
1174
1175 static int uvesafb_open(struct fb_info *info, int user)
1176 {
1177 struct uvesafb_par *par = info->par;
1178 int cnt = atomic_read(&par->ref_count);
1179 u8 *buf = NULL;
1180
1181 if (!cnt && par->vbe_state_size) {
1182 buf = uvesafb_vbe_state_save(par);
1183 if (IS_ERR(buf)) {
1184 printk(KERN_WARNING "uvesafb: save hardware state"
1185 "failed, error code is %ld!\n", PTR_ERR(buf));
1186 } else {
1187 par->vbe_state_orig = buf;
1188 }
1189 }
1190
1191 atomic_inc(&par->ref_count);
1192 return 0;
1193 }
1194
1195 static int uvesafb_release(struct fb_info *info, int user)
1196 {
1197 struct uvesafb_ktask *task = NULL;
1198 struct uvesafb_par *par = info->par;
1199 int cnt = atomic_read(&par->ref_count);
1200
1201 if (!cnt)
1202 return -EINVAL;
1203
1204 if (cnt != 1)
1205 goto out;
1206
1207 task = uvesafb_prep();
1208 if (!task)
1209 goto out;
1210
1211 /* First, try to set the standard 80x25 text mode. */
1212 task->t.regs.eax = 0x0003;
1213 uvesafb_exec(task);
1214
1215 /*
1216 * Now try to restore whatever hardware state we might have
1217 * saved when the fb device was first opened.
1218 */
1219 uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1220 out:
1221 atomic_dec(&par->ref_count);
1222 uvesafb_free(task);
1223 return 0;
1224 }
1225
1226 static int uvesafb_set_par(struct fb_info *info)
1227 {
1228 struct uvesafb_par *par = info->par;
1229 struct uvesafb_ktask *task = NULL;
1230 struct vbe_crtc_ib *crtc = NULL;
1231 struct vbe_mode_ib *mode = NULL;
1232 int i, err = 0, depth = info->var.bits_per_pixel;
1233
1234 if (depth > 8 && depth != 32)
1235 depth = info->var.red.length + info->var.green.length +
1236 info->var.blue.length;
1237
1238 i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1239 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1240 if (i >= 0)
1241 mode = &par->vbe_modes[i];
1242 else
1243 return -EINVAL;
1244
1245 task = uvesafb_prep();
1246 if (!task)
1247 return -ENOMEM;
1248 setmode:
1249 task->t.regs.eax = 0x4f02;
1250 task->t.regs.ebx = mode->mode_id | 0x4000; /* use LFB */
1251
1252 if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1253 info->var.pixclock != 0) {
1254 task->t.regs.ebx |= 0x0800; /* use CRTC data */
1255 task->t.flags = TF_BUF_ESDI;
1256 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1257 if (!crtc) {
1258 err = -ENOMEM;
1259 goto out;
1260 }
1261 crtc->horiz_start = info->var.xres + info->var.right_margin;
1262 crtc->horiz_end = crtc->horiz_start + info->var.hsync_len;
1263 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1264
1265 crtc->vert_start = info->var.yres + info->var.lower_margin;
1266 crtc->vert_end = crtc->vert_start + info->var.vsync_len;
1267 crtc->vert_total = crtc->vert_end + info->var.upper_margin;
1268
1269 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1270 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1271 (crtc->vert_total * crtc->horiz_total)));
1272
1273 if (info->var.vmode & FB_VMODE_DOUBLE)
1274 crtc->flags |= 0x1;
1275 if (info->var.vmode & FB_VMODE_INTERLACED)
1276 crtc->flags |= 0x2;
1277 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1278 crtc->flags |= 0x4;
1279 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1280 crtc->flags |= 0x8;
1281 memcpy(&par->crtc, crtc, sizeof(*crtc));
1282 } else {
1283 memset(&par->crtc, 0, sizeof(*crtc));
1284 }
1285
1286 task->t.buf_len = sizeof(struct vbe_crtc_ib);
1287 task->buf = &par->crtc;
1288
1289 err = uvesafb_exec(task);
1290 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1291 /*
1292 * The mode switch might have failed because we tried to
1293 * use our own timings. Try again with the default timings.
1294 */
1295 if (crtc != NULL) {
1296 printk(KERN_WARNING "uvesafb: mode switch failed "
1297 "(eax=0x%x, err=%d). Trying again with "
1298 "default timings.\n", task->t.regs.eax, err);
1299 uvesafb_reset(task);
1300 kfree(crtc);
1301 crtc = NULL;
1302 info->var.pixclock = 0;
1303 goto setmode;
1304 } else {
1305 printk(KERN_ERR "uvesafb: mode switch failed (eax="
1306 "0x%x, err=%d)\n", task->t.regs.eax, err);
1307 err = -EINVAL;
1308 goto out;
1309 }
1310 }
1311 par->mode_idx = i;
1312
1313 /* For 8bpp modes, always try to set the DAC to 8 bits. */
1314 if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1315 mode->bits_per_pixel <= 8) {
1316 uvesafb_reset(task);
1317 task->t.regs.eax = 0x4f08;
1318 task->t.regs.ebx = 0x0800;
1319
1320 err = uvesafb_exec(task);
1321 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1322 ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1323 dac_width = 6;
1324 } else {
1325 dac_width = 8;
1326 }
1327 }
1328
1329 info->fix.visual = (info->var.bits_per_pixel == 8) ?
1330 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1331 info->fix.line_length = mode->bytes_per_scan_line;
1332
1333 out:
1334 kfree(crtc);
1335 uvesafb_free(task);
1336
1337 return err;
1338 }
1339
1340 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1341 struct fb_info *info)
1342 {
1343 const struct fb_videomode *mode;
1344 struct uvesafb_par *par = info->par;
1345
1346 /*
1347 * If pixclock is set to 0, then we're using default BIOS timings
1348 * and thus don't have to perform any checks here.
1349 */
1350 if (!var->pixclock)
1351 return;
1352
1353 if (par->vbe_ib.vbe_version < 0x0300) {
1354 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1355 return;
1356 }
1357
1358 if (!fb_validate_mode(var, info))
1359 return;
1360
1361 mode = fb_find_best_mode(var, &info->modelist);
1362 if (mode) {
1363 if (mode->xres == var->xres && mode->yres == var->yres &&
1364 !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1365 fb_videomode_to_var(var, mode);
1366 return;
1367 }
1368 }
1369
1370 if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1371 return;
1372 /* Use default refresh rate */
1373 var->pixclock = 0;
1374 }
1375
1376 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1377 struct fb_info *info)
1378 {
1379 struct uvesafb_par *par = info->par;
1380 struct vbe_mode_ib *mode = NULL;
1381 int match = -1;
1382 int depth = var->red.length + var->green.length + var->blue.length;
1383
1384 /*
1385 * Various apps will use bits_per_pixel to set the color depth,
1386 * which is theoretically incorrect, but which we'll try to handle
1387 * here.
1388 */
1389 if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1390 depth = var->bits_per_pixel;
1391
1392 match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1393 UVESAFB_EXACT_RES);
1394 if (match == -1)
1395 return -EINVAL;
1396
1397 mode = &par->vbe_modes[match];
1398 uvesafb_setup_var(var, info, mode);
1399
1400 /*
1401 * Check whether we have remapped enough memory for this mode.
1402 * We might be called at an early stage, when we haven't remapped
1403 * any memory yet, in which case we simply skip the check.
1404 */
1405 if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1406 && info->fix.smem_len)
1407 return -EINVAL;
1408
1409 if ((var->vmode & FB_VMODE_DOUBLE) &&
1410 !(par->vbe_modes[match].mode_attr & 0x100))
1411 var->vmode &= ~FB_VMODE_DOUBLE;
1412
1413 if ((var->vmode & FB_VMODE_INTERLACED) &&
1414 !(par->vbe_modes[match].mode_attr & 0x200))
1415 var->vmode &= ~FB_VMODE_INTERLACED;
1416
1417 uvesafb_check_limits(var, info);
1418
1419 var->xres_virtual = var->xres;
1420 var->yres_virtual = (par->ypan) ?
1421 info->fix.smem_len / mode->bytes_per_scan_line :
1422 var->yres;
1423 return 0;
1424 }
1425
1426 static struct fb_ops uvesafb_ops = {
1427 .owner = THIS_MODULE,
1428 .fb_open = uvesafb_open,
1429 .fb_release = uvesafb_release,
1430 .fb_setcolreg = uvesafb_setcolreg,
1431 .fb_setcmap = uvesafb_setcmap,
1432 .fb_pan_display = uvesafb_pan_display,
1433 .fb_blank = uvesafb_blank,
1434 .fb_fillrect = cfb_fillrect,
1435 .fb_copyarea = cfb_copyarea,
1436 .fb_imageblit = cfb_imageblit,
1437 .fb_check_var = uvesafb_check_var,
1438 .fb_set_par = uvesafb_set_par,
1439 };
1440
1441 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1442 {
1443 unsigned int size_vmode;
1444 unsigned int size_remap;
1445 unsigned int size_total;
1446 struct uvesafb_par *par = info->par;
1447 int i, h;
1448
1449 info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1450 info->fix = uvesafb_fix;
1451 info->fix.ypanstep = par->ypan ? 1 : 0;
1452 info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1453
1454 /* Disable blanking if the user requested so. */
1455 if (!blank)
1456 info->fbops->fb_blank = NULL;
1457
1458 /*
1459 * Find out how much IO memory is required for the mode with
1460 * the highest resolution.
1461 */
1462 size_remap = 0;
1463 for (i = 0; i < par->vbe_modes_cnt; i++) {
1464 h = par->vbe_modes[i].bytes_per_scan_line *
1465 par->vbe_modes[i].y_res;
1466 if (h > size_remap)
1467 size_remap = h;
1468 }
1469 size_remap *= 2;
1470
1471 /*
1472 * size_vmode -- that is the amount of memory needed for the
1473 * used video mode, i.e. the minimum amount of
1474 * memory we need.
1475 */
1476 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1477
1478 /*
1479 * size_total -- all video memory we have. Used for mtrr
1480 * entries, resource allocation and bounds
1481 * checking.
1482 */
1483 size_total = par->vbe_ib.total_memory * 65536;
1484 if (vram_total)
1485 size_total = vram_total * 1024 * 1024;
1486 if (size_total < size_vmode)
1487 size_total = size_vmode;
1488
1489 /*
1490 * size_remap -- the amount of video memory we are going to
1491 * use for vesafb. With modern cards it is no
1492 * option to simply use size_total as th
1493 * wastes plenty of kernel address space.
1494 */
1495 if (vram_remap)
1496 size_remap = vram_remap * 1024 * 1024;
1497 if (size_remap < size_vmode)
1498 size_remap = size_vmode;
1499 if (size_remap > size_total)
1500 size_remap = size_total;
1501
1502 info->fix.smem_len = size_remap;
1503 info->fix.smem_start = mode->phys_base_ptr;
1504
1505 /*
1506 * We have to set yres_virtual here because when setup_var() was
1507 * called, smem_len wasn't defined yet.
1508 */
1509 info->var.yres_virtual = info->fix.smem_len /
1510 mode->bytes_per_scan_line;
1511
1512 if (par->ypan && info->var.yres_virtual > info->var.yres) {
1513 printk(KERN_INFO "uvesafb: scrolling: %s "
1514 "using protected mode interface, "
1515 "yres_virtual=%d\n",
1516 (par->ypan > 1) ? "ywrap" : "ypan",
1517 info->var.yres_virtual);
1518 } else {
1519 printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1520 info->var.yres_virtual = info->var.yres;
1521 par->ypan = 0;
1522 }
1523
1524 info->flags = FBINFO_FLAG_DEFAULT |
1525 (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1526
1527 if (!par->ypan)
1528 info->fbops->fb_pan_display = NULL;
1529 }
1530
1531 static void uvesafb_init_mtrr(struct fb_info *info)
1532 {
1533 struct uvesafb_par *par = info->par;
1534
1535 if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1536 int temp_size = info->fix.smem_len;
1537
1538 int rc;
1539
1540 /* Find the largest power-of-two */
1541 temp_size = roundup_pow_of_two(temp_size);
1542
1543 /* Try and find a power of two to add */
1544 do {
1545 rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1546 temp_size >>= 1;
1547 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1548
1549 if (rc >= 0)
1550 par->mtrr_handle = rc;
1551 }
1552 }
1553
1554 static void uvesafb_ioremap(struct fb_info *info)
1555 {
1556 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1557 }
1558
1559 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1560 struct device_attribute *attr, char *buf)
1561 {
1562 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1563 struct uvesafb_par *par = info->par;
1564
1565 return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1566 }
1567
1568 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1569
1570 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1571 struct device_attribute *attr, char *buf)
1572 {
1573 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1574 struct uvesafb_par *par = info->par;
1575 int ret = 0, i;
1576
1577 for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1578 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1579 "%dx%d-%d, 0x%.4x\n",
1580 par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1581 par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1582 }
1583
1584 return ret;
1585 }
1586
1587 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1588
1589 static ssize_t uvesafb_show_vendor(struct device *dev,
1590 struct device_attribute *attr, char *buf)
1591 {
1592 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1593 struct uvesafb_par *par = info->par;
1594
1595 if (par->vbe_ib.oem_vendor_name_ptr)
1596 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1597 (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1598 else
1599 return 0;
1600 }
1601
1602 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1603
1604 static ssize_t uvesafb_show_product_name(struct device *dev,
1605 struct device_attribute *attr, char *buf)
1606 {
1607 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1608 struct uvesafb_par *par = info->par;
1609
1610 if (par->vbe_ib.oem_product_name_ptr)
1611 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1612 (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1613 else
1614 return 0;
1615 }
1616
1617 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1618
1619 static ssize_t uvesafb_show_product_rev(struct device *dev,
1620 struct device_attribute *attr, char *buf)
1621 {
1622 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1623 struct uvesafb_par *par = info->par;
1624
1625 if (par->vbe_ib.oem_product_rev_ptr)
1626 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1627 (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1628 else
1629 return 0;
1630 }
1631
1632 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1633
1634 static ssize_t uvesafb_show_oem_string(struct device *dev,
1635 struct device_attribute *attr, char *buf)
1636 {
1637 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1638 struct uvesafb_par *par = info->par;
1639
1640 if (par->vbe_ib.oem_string_ptr)
1641 return snprintf(buf, PAGE_SIZE, "%s\n",
1642 (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1643 else
1644 return 0;
1645 }
1646
1647 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1648
1649 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1650 struct device_attribute *attr, char *buf)
1651 {
1652 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1653 struct uvesafb_par *par = info->par;
1654
1655 return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1656 }
1657
1658 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1659 struct device_attribute *attr, const char *buf, size_t count)
1660 {
1661 struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1662 struct uvesafb_par *par = info->par;
1663
1664 if (count > 0) {
1665 if (buf[0] == '0')
1666 par->nocrtc = 0;
1667 else
1668 par->nocrtc = 1;
1669 }
1670 return count;
1671 }
1672
1673 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1674 uvesafb_store_nocrtc);
1675
1676 static struct attribute *uvesafb_dev_attrs[] = {
1677 &dev_attr_vbe_version.attr,
1678 &dev_attr_vbe_modes.attr,
1679 &dev_attr_oem_vendor.attr,
1680 &dev_attr_oem_product_name.attr,
1681 &dev_attr_oem_product_rev.attr,
1682 &dev_attr_oem_string.attr,
1683 &dev_attr_nocrtc.attr,
1684 NULL,
1685 };
1686
1687 static struct attribute_group uvesafb_dev_attgrp = {
1688 .name = NULL,
1689 .attrs = uvesafb_dev_attrs,
1690 };
1691
1692 static int uvesafb_probe(struct platform_device *dev)
1693 {
1694 struct fb_info *info;
1695 struct vbe_mode_ib *mode = NULL;
1696 struct uvesafb_par *par;
1697 int err = 0, i;
1698
1699 info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1700 if (!info)
1701 return -ENOMEM;
1702
1703 par = info->par;
1704
1705 err = uvesafb_vbe_init(info);
1706 if (err) {
1707 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1708 goto out;
1709 }
1710
1711 info->fbops = &uvesafb_ops;
1712
1713 i = uvesafb_vbe_init_mode(info);
1714 if (i < 0) {
1715 err = -EINVAL;
1716 goto out;
1717 } else {
1718 mode = &par->vbe_modes[i];
1719 }
1720
1721 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1722 err = -ENXIO;
1723 goto out;
1724 }
1725
1726 uvesafb_init_info(info, mode);
1727
1728 if (!request_region(0x3c0, 32, "uvesafb")) {
1729 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1730 err = -EIO;
1731 goto out_mode;
1732 }
1733
1734 if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1735 "uvesafb")) {
1736 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1737 "0x%lx\n", info->fix.smem_start);
1738 err = -EIO;
1739 goto out_reg;
1740 }
1741
1742 uvesafb_init_mtrr(info);
1743 uvesafb_ioremap(info);
1744
1745 if (!info->screen_base) {
1746 printk(KERN_ERR
1747 "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1748 "memory at 0x%lx\n",
1749 info->fix.smem_len, info->fix.smem_start);
1750 err = -EIO;
1751 goto out_mem;
1752 }
1753
1754 platform_set_drvdata(dev, info);
1755
1756 if (register_framebuffer(info) < 0) {
1757 printk(KERN_ERR
1758 "uvesafb: failed to register framebuffer device\n");
1759 err = -EINVAL;
1760 goto out_unmap;
1761 }
1762
1763 printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1764 "using %dk, total %dk\n", info->fix.smem_start,
1765 info->screen_base, info->fix.smem_len/1024,
1766 par->vbe_ib.total_memory * 64);
1767 fb_info(info, "%s frame buffer device\n", info->fix.id);
1768
1769 err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1770 if (err != 0)
1771 fb_warn(info, "failed to register attributes\n");
1772
1773 return 0;
1774
1775 out_unmap:
1776 iounmap(info->screen_base);
1777 out_mem:
1778 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1779 out_reg:
1780 release_region(0x3c0, 32);
1781 out_mode:
1782 if (!list_empty(&info->modelist))
1783 fb_destroy_modelist(&info->modelist);
1784 fb_destroy_modedb(info->monspecs.modedb);
1785 fb_dealloc_cmap(&info->cmap);
1786 out:
1787 kfree(par->vbe_modes);
1788
1789 framebuffer_release(info);
1790 return err;
1791 }
1792
1793 static int uvesafb_remove(struct platform_device *dev)
1794 {
1795 struct fb_info *info = platform_get_drvdata(dev);
1796
1797 if (info) {
1798 struct uvesafb_par *par = info->par;
1799
1800 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1801 unregister_framebuffer(info);
1802 release_region(0x3c0, 32);
1803 iounmap(info->screen_base);
1804 arch_phys_wc_del(par->mtrr_handle);
1805 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1806 fb_destroy_modedb(info->monspecs.modedb);
1807 fb_dealloc_cmap(&info->cmap);
1808
1809 kfree(par->vbe_modes);
1810 kfree(par->vbe_state_orig);
1811 kfree(par->vbe_state_saved);
1812
1813 framebuffer_release(info);
1814 }
1815 return 0;
1816 }
1817
1818 static struct platform_driver uvesafb_driver = {
1819 .probe = uvesafb_probe,
1820 .remove = uvesafb_remove,
1821 .driver = {
1822 .name = "uvesafb",
1823 },
1824 };
1825
1826 static struct platform_device *uvesafb_device;
1827
1828 #ifndef MODULE
1829 static int uvesafb_setup(char *options)
1830 {
1831 char *this_opt;
1832
1833 if (!options || !*options)
1834 return 0;
1835
1836 while ((this_opt = strsep(&options, ",")) != NULL) {
1837 if (!*this_opt) continue;
1838
1839 if (!strcmp(this_opt, "redraw"))
1840 ypan = 0;
1841 else if (!strcmp(this_opt, "ypan"))
1842 ypan = 1;
1843 else if (!strcmp(this_opt, "ywrap"))
1844 ypan = 2;
1845 else if (!strcmp(this_opt, "vgapal"))
1846 pmi_setpal = 0;
1847 else if (!strcmp(this_opt, "pmipal"))
1848 pmi_setpal = 1;
1849 else if (!strncmp(this_opt, "mtrr:", 5))
1850 mtrr = simple_strtoul(this_opt+5, NULL, 0);
1851 else if (!strcmp(this_opt, "nomtrr"))
1852 mtrr = 0;
1853 else if (!strcmp(this_opt, "nocrtc"))
1854 nocrtc = 1;
1855 else if (!strcmp(this_opt, "noedid"))
1856 noedid = 1;
1857 else if (!strcmp(this_opt, "noblank"))
1858 blank = 0;
1859 else if (!strncmp(this_opt, "vtotal:", 7))
1860 vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1861 else if (!strncmp(this_opt, "vremap:", 7))
1862 vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1863 else if (!strncmp(this_opt, "maxhf:", 6))
1864 maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1865 else if (!strncmp(this_opt, "maxvf:", 6))
1866 maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1867 else if (!strncmp(this_opt, "maxclk:", 7))
1868 maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1869 else if (!strncmp(this_opt, "vbemode:", 8))
1870 vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1871 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1872 mode_option = this_opt;
1873 } else {
1874 printk(KERN_WARNING
1875 "uvesafb: unrecognized option %s\n", this_opt);
1876 }
1877 }
1878
1879 if (mtrr != 3 && mtrr != 0)
1880 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1881
1882 return 0;
1883 }
1884 #endif /* !MODULE */
1885
1886 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1887 {
1888 return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1889 }
1890
1891 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1892 size_t count)
1893 {
1894 strncpy(v86d_path, buf, PATH_MAX);
1895 return count;
1896 }
1897
1898 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1899
1900 static int uvesafb_init(void)
1901 {
1902 int err;
1903
1904 #ifndef MODULE
1905 char *option = NULL;
1906
1907 if (fb_get_options("uvesafb", &option))
1908 return -ENODEV;
1909 uvesafb_setup(option);
1910 #endif
1911 err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1912 if (err)
1913 return err;
1914
1915 err = platform_driver_register(&uvesafb_driver);
1916
1917 if (!err) {
1918 uvesafb_device = platform_device_alloc("uvesafb", 0);
1919 if (uvesafb_device)
1920 err = platform_device_add(uvesafb_device);
1921 else
1922 err = -ENOMEM;
1923
1924 if (err) {
1925 platform_device_put(uvesafb_device);
1926 platform_driver_unregister(&uvesafb_driver);
1927 cn_del_callback(&uvesafb_cn_id);
1928 return err;
1929 }
1930
1931 err = driver_create_file(&uvesafb_driver.driver,
1932 &driver_attr_v86d);
1933 if (err) {
1934 printk(KERN_WARNING "uvesafb: failed to register "
1935 "attributes\n");
1936 err = 0;
1937 }
1938 }
1939 return err;
1940 }
1941
1942 module_init(uvesafb_init);
1943
1944 static void uvesafb_exit(void)
1945 {
1946 struct uvesafb_ktask *task;
1947
1948 if (v86d_started) {
1949 task = uvesafb_prep();
1950 if (task) {
1951 task->t.flags = TF_EXIT;
1952 uvesafb_exec(task);
1953 uvesafb_free(task);
1954 }
1955 }
1956
1957 cn_del_callback(&uvesafb_cn_id);
1958 driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1959 platform_device_unregister(uvesafb_device);
1960 platform_driver_unregister(&uvesafb_driver);
1961 }
1962
1963 module_exit(uvesafb_exit);
1964
1965 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1966 {
1967 ypan = 0;
1968
1969 if (!strcmp(val, "redraw"))
1970 ypan = 0;
1971 else if (!strcmp(val, "ypan"))
1972 ypan = 1;
1973 else if (!strcmp(val, "ywrap"))
1974 ypan = 2;
1975 else
1976 return -EINVAL;
1977
1978 return 0;
1979 }
1980 static struct kernel_param_ops param_ops_scroll = {
1981 .set = param_set_scroll,
1982 };
1983 #define param_check_scroll(name, p) __param_check(name, p, void)
1984
1985 module_param_named(scroll, ypan, scroll, 0);
1986 MODULE_PARM_DESC(scroll,
1987 "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1988 module_param_named(vgapal, pmi_setpal, invbool, 0);
1989 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1990 module_param_named(pmipal, pmi_setpal, bool, 0);
1991 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1992 module_param(mtrr, uint, 0);
1993 MODULE_PARM_DESC(mtrr,
1994 "Memory Type Range Registers setting. Use 0 to disable.");
1995 module_param(blank, bool, 0);
1996 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1997 module_param(nocrtc, bool, 0);
1998 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1999 module_param(noedid, bool, 0);
2000 MODULE_PARM_DESC(noedid,
2001 "Ignore EDID-provided monitor limits when setting modes");
2002 module_param(vram_remap, uint, 0);
2003 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2004 module_param(vram_total, uint, 0);
2005 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2006 module_param(maxclk, ushort, 0);
2007 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2008 module_param(maxhf, ushort, 0);
2009 MODULE_PARM_DESC(maxhf,
2010 "Maximum horizontal frequency [kHz], overrides EDID data");
2011 module_param(maxvf, ushort, 0);
2012 MODULE_PARM_DESC(maxvf,
2013 "Maximum vertical frequency [Hz], overrides EDID data");
2014 module_param(mode_option, charp, 0);
2015 MODULE_PARM_DESC(mode_option,
2016 "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2017 module_param(vbemode, ushort, 0);
2018 MODULE_PARM_DESC(vbemode,
2019 "VBE mode number to set, overrides the 'mode' option");
2020 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2021 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2022
2023 MODULE_LICENSE("GPL");
2024 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2025 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2026
Linux with added FPC-III support