xref: /openbmc/linux/drivers/video/fbdev/uvesafb.c (revision 1022e7e2)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * A framebuffer driver for VBE 2.0+ compliant video cards
4  *
5  * (c) 2007 Michal Januszewski <spock@gentoo.org>
6  *     Loosely based upon the vesafb driver.
7  *
8  */
9 
10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/moduleparam.h>
15 #include <linux/skbuff.h>
16 #include <linux/timer.h>
17 #include <linux/completion.h>
18 #include <linux/connector.h>
19 #include <linux/random.h>
20 #include <linux/platform_device.h>
21 #include <linux/limits.h>
22 #include <linux/fb.h>
23 #include <linux/io.h>
24 #include <linux/mutex.h>
25 #include <linux/slab.h>
26 #include <video/edid.h>
27 #include <video/uvesafb.h>
28 #ifdef CONFIG_X86
29 #include <video/vga.h>
30 #endif
31 #include "edid.h"
32 
33 static struct cb_id uvesafb_cn_id = {
34 	.idx = CN_IDX_V86D,
35 	.val = CN_VAL_V86D_UVESAFB
36 };
37 static char v86d_path[PATH_MAX] = "/sbin/v86d";
38 static char v86d_started;	/* has v86d been started by uvesafb? */
39 
40 static const struct fb_fix_screeninfo uvesafb_fix = {
41 	.id	= "VESA VGA",
42 	.type	= FB_TYPE_PACKED_PIXELS,
43 	.accel	= FB_ACCEL_NONE,
44 	.visual = FB_VISUAL_TRUECOLOR,
45 };
46 
47 static int mtrr		= 3;	/* enable mtrr by default */
48 static bool blank	= true;	/* enable blanking by default */
49 static int ypan		= 1;	/* 0: scroll, 1: ypan, 2: ywrap */
50 static bool pmi_setpal	= true; /* use PMI for palette changes */
51 static bool nocrtc;		/* ignore CRTC settings */
52 static bool noedid;		/* don't try DDC transfers */
53 static int vram_remap;		/* set amt. of memory to be used */
54 static int vram_total;		/* set total amount of memory */
55 static u16 maxclk;		/* maximum pixel clock */
56 static u16 maxvf;		/* maximum vertical frequency */
57 static u16 maxhf;		/* maximum horizontal frequency */
58 static u16 vbemode;		/* force use of a specific VBE mode */
59 static char *mode_option;
60 static u8  dac_width	= 6;
61 
62 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
63 static DEFINE_MUTEX(uvfb_lock);
64 
65 /*
66  * A handler for replies from userspace.
67  *
68  * Make sure each message passes consistency checks and if it does,
69  * find the kernel part of the task struct, copy the registers and
70  * the buffer contents and then complete the task.
71  */
uvesafb_cn_callback(struct cn_msg * msg,struct netlink_skb_parms * nsp)72 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
73 {
74 	struct uvesafb_task *utask;
75 	struct uvesafb_ktask *task;
76 
77 	if (!capable(CAP_SYS_ADMIN))
78 		return;
79 
80 	if (msg->seq >= UVESAFB_TASKS_MAX)
81 		return;
82 
83 	mutex_lock(&uvfb_lock);
84 	task = uvfb_tasks[msg->seq];
85 
86 	if (!task || msg->ack != task->ack) {
87 		mutex_unlock(&uvfb_lock);
88 		return;
89 	}
90 
91 	utask = (struct uvesafb_task *)msg->data;
92 
93 	/* Sanity checks for the buffer length. */
94 	if (task->t.buf_len < utask->buf_len ||
95 	    utask->buf_len > msg->len - sizeof(*utask)) {
96 		mutex_unlock(&uvfb_lock);
97 		return;
98 	}
99 
100 	uvfb_tasks[msg->seq] = NULL;
101 	mutex_unlock(&uvfb_lock);
102 
103 	memcpy(&task->t, utask, sizeof(*utask));
104 
105 	if (task->t.buf_len && task->buf)
106 		memcpy(task->buf, utask + 1, task->t.buf_len);
107 
108 	complete(task->done);
109 	return;
110 }
111 
uvesafb_helper_start(void)112 static int uvesafb_helper_start(void)
113 {
114 	char *envp[] = {
115 		"HOME=/",
116 		"PATH=/sbin:/bin",
117 		NULL,
118 	};
119 
120 	char *argv[] = {
121 		v86d_path,
122 		NULL,
123 	};
124 
125 	return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
126 }
127 
128 /*
129  * Execute a uvesafb task.
130  *
131  * Returns 0 if the task is executed successfully.
132  *
133  * A message sent to the userspace consists of the uvesafb_task
134  * struct and (optionally) a buffer. The uvesafb_task struct is
135  * a simplified version of uvesafb_ktask (its kernel counterpart)
136  * containing only the register values, flags and the length of
137  * the buffer.
138  *
139  * Each message is assigned a sequence number (increased linearly)
140  * and a random ack number. The sequence number is used as a key
141  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
142  * structs for all requests.
143  */
uvesafb_exec(struct uvesafb_ktask * task)144 static int uvesafb_exec(struct uvesafb_ktask *task)
145 {
146 	static int seq;
147 	struct cn_msg *m;
148 	int err;
149 	int len = sizeof(task->t) + task->t.buf_len;
150 
151 	/*
152 	 * Check whether the message isn't longer than the maximum
153 	 * allowed by connector.
154 	 */
155 	if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
156 		pr_warn("message too long (%d), can't execute task\n",
157 			(int)(sizeof(*m) + len));
158 		return -E2BIG;
159 	}
160 
161 	m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
162 	if (!m)
163 		return -ENOMEM;
164 
165 	init_completion(task->done);
166 
167 	memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
168 	m->seq = seq;
169 	m->len = len;
170 	m->ack = get_random_u32();
171 
172 	/* uvesafb_task structure */
173 	memcpy(m + 1, &task->t, sizeof(task->t));
174 
175 	/* Buffer */
176 	memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
177 
178 	/*
179 	 * Save the message ack number so that we can find the kernel
180 	 * part of this task when a reply is received from userspace.
181 	 */
182 	task->ack = m->ack;
183 
184 	mutex_lock(&uvfb_lock);
185 
186 	/* If all slots are taken -- bail out. */
187 	if (uvfb_tasks[seq]) {
188 		mutex_unlock(&uvfb_lock);
189 		err = -EBUSY;
190 		goto out;
191 	}
192 
193 	/* Save a pointer to the kernel part of the task struct. */
194 	uvfb_tasks[seq] = task;
195 	mutex_unlock(&uvfb_lock);
196 
197 	err = cn_netlink_send(m, 0, 0, GFP_KERNEL);
198 	if (err == -ESRCH) {
199 		/*
200 		 * Try to start the userspace helper if sending
201 		 * the request failed the first time.
202 		 */
203 		err = uvesafb_helper_start();
204 		if (err) {
205 			pr_err("failed to execute %s\n", v86d_path);
206 			pr_err("make sure that the v86d helper is installed and executable\n");
207 		} else {
208 			v86d_started = 1;
209 			err = cn_netlink_send(m, 0, 0, gfp_any());
210 			if (err == -ENOBUFS)
211 				err = 0;
212 		}
213 	} else if (err == -ENOBUFS)
214 		err = 0;
215 
216 	if (!err && !(task->t.flags & TF_EXIT))
217 		err = !wait_for_completion_timeout(task->done,
218 				msecs_to_jiffies(UVESAFB_TIMEOUT));
219 
220 	mutex_lock(&uvfb_lock);
221 	uvfb_tasks[seq] = NULL;
222 	mutex_unlock(&uvfb_lock);
223 
224 	seq++;
225 	if (seq >= UVESAFB_TASKS_MAX)
226 		seq = 0;
227 out:
228 	kfree(m);
229 	return err;
230 }
231 
232 /*
233  * Free a uvesafb_ktask struct.
234  */
uvesafb_free(struct uvesafb_ktask * task)235 static void uvesafb_free(struct uvesafb_ktask *task)
236 {
237 	if (task) {
238 		kfree(task->done);
239 		kfree(task);
240 	}
241 }
242 
243 /*
244  * Prepare a uvesafb_ktask struct to be used again.
245  */
uvesafb_reset(struct uvesafb_ktask * task)246 static void uvesafb_reset(struct uvesafb_ktask *task)
247 {
248 	struct completion *cpl = task->done;
249 
250 	memset(task, 0, sizeof(*task));
251 	task->done = cpl;
252 }
253 
254 /*
255  * Allocate and prepare a uvesafb_ktask struct.
256  */
uvesafb_prep(void)257 static struct uvesafb_ktask *uvesafb_prep(void)
258 {
259 	struct uvesafb_ktask *task;
260 
261 	task = kzalloc(sizeof(*task), GFP_KERNEL);
262 	if (task) {
263 		task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
264 		if (!task->done) {
265 			kfree(task);
266 			task = NULL;
267 		}
268 	}
269 	return task;
270 }
271 
uvesafb_setup_var(struct fb_var_screeninfo * var,struct fb_info * info,struct vbe_mode_ib * mode)272 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
273 		struct fb_info *info, struct vbe_mode_ib *mode)
274 {
275 	struct uvesafb_par *par = info->par;
276 
277 	var->vmode = FB_VMODE_NONINTERLACED;
278 	var->sync = FB_SYNC_VERT_HIGH_ACT;
279 
280 	var->xres = mode->x_res;
281 	var->yres = mode->y_res;
282 	var->xres_virtual = mode->x_res;
283 	var->yres_virtual = (par->ypan) ?
284 			info->fix.smem_len / mode->bytes_per_scan_line :
285 			mode->y_res;
286 	var->xoffset = 0;
287 	var->yoffset = 0;
288 	var->bits_per_pixel = mode->bits_per_pixel;
289 
290 	if (var->bits_per_pixel == 15)
291 		var->bits_per_pixel = 16;
292 
293 	if (var->bits_per_pixel > 8) {
294 		var->red.offset    = mode->red_off;
295 		var->red.length    = mode->red_len;
296 		var->green.offset  = mode->green_off;
297 		var->green.length  = mode->green_len;
298 		var->blue.offset   = mode->blue_off;
299 		var->blue.length   = mode->blue_len;
300 		var->transp.offset = mode->rsvd_off;
301 		var->transp.length = mode->rsvd_len;
302 	} else {
303 		var->red.offset    = 0;
304 		var->green.offset  = 0;
305 		var->blue.offset   = 0;
306 		var->transp.offset = 0;
307 
308 		var->red.length    = 8;
309 		var->green.length  = 8;
310 		var->blue.length   = 8;
311 		var->transp.length = 0;
312 	}
313 }
314 
uvesafb_vbe_find_mode(struct uvesafb_par * par,int xres,int yres,int depth,unsigned char flags)315 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
316 		int xres, int yres, int depth, unsigned char flags)
317 {
318 	int i, match = -1, h = 0, d = 0x7fffffff;
319 
320 	for (i = 0; i < par->vbe_modes_cnt; i++) {
321 		h = abs(par->vbe_modes[i].x_res - xres) +
322 		    abs(par->vbe_modes[i].y_res - yres) +
323 		    abs(depth - par->vbe_modes[i].depth);
324 
325 		/*
326 		 * We have an exact match in terms of resolution
327 		 * and depth.
328 		 */
329 		if (h == 0)
330 			return i;
331 
332 		if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
333 			d = h;
334 			match = i;
335 		}
336 	}
337 	i = 1;
338 
339 	if (flags & UVESAFB_EXACT_DEPTH &&
340 			par->vbe_modes[match].depth != depth)
341 		i = 0;
342 
343 	if (flags & UVESAFB_EXACT_RES && d > 24)
344 		i = 0;
345 
346 	if (i != 0)
347 		return match;
348 	else
349 		return -1;
350 }
351 
uvesafb_vbe_state_save(struct uvesafb_par * par)352 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
353 {
354 	struct uvesafb_ktask *task;
355 	u8 *state;
356 	int err;
357 
358 	if (!par->vbe_state_size)
359 		return NULL;
360 
361 	state = kmalloc(par->vbe_state_size, GFP_KERNEL);
362 	if (!state)
363 		return ERR_PTR(-ENOMEM);
364 
365 	task = uvesafb_prep();
366 	if (!task) {
367 		kfree(state);
368 		return NULL;
369 	}
370 
371 	task->t.regs.eax = 0x4f04;
372 	task->t.regs.ecx = 0x000f;
373 	task->t.regs.edx = 0x0001;
374 	task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
375 	task->t.buf_len = par->vbe_state_size;
376 	task->buf = state;
377 	err = uvesafb_exec(task);
378 
379 	if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
380 		pr_warn("VBE get state call failed (eax=0x%x, err=%d)\n",
381 			task->t.regs.eax, err);
382 		kfree(state);
383 		state = NULL;
384 	}
385 
386 	uvesafb_free(task);
387 	return state;
388 }
389 
uvesafb_vbe_state_restore(struct uvesafb_par * par,u8 * state_buf)390 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
391 {
392 	struct uvesafb_ktask *task;
393 	int err;
394 
395 	if (!state_buf)
396 		return;
397 
398 	task = uvesafb_prep();
399 	if (!task)
400 		return;
401 
402 	task->t.regs.eax = 0x4f04;
403 	task->t.regs.ecx = 0x000f;
404 	task->t.regs.edx = 0x0002;
405 	task->t.buf_len = par->vbe_state_size;
406 	task->t.flags = TF_BUF_ESBX;
407 	task->buf = state_buf;
408 
409 	err = uvesafb_exec(task);
410 	if (err || (task->t.regs.eax & 0xffff) != 0x004f)
411 		pr_warn("VBE state restore call failed (eax=0x%x, err=%d)\n",
412 			task->t.regs.eax, err);
413 
414 	uvesafb_free(task);
415 }
416 
uvesafb_vbe_getinfo(struct uvesafb_ktask * task,struct uvesafb_par * par)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 	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 
uvesafb_vbe_getmodes(struct uvesafb_ktask * task,struct uvesafb_par * par)475 static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
476 				struct uvesafb_par *par)
477 {
478 	int off = 0, err;
479 	u16 *mode;
480 
481 	par->vbe_modes_cnt = 0;
482 
483 	/* Count available modes. */
484 	mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
485 	while (*mode != 0xffff) {
486 		par->vbe_modes_cnt++;
487 		mode++;
488 	}
489 
490 	par->vbe_modes = kcalloc(par->vbe_modes_cnt,
491 				 sizeof(struct vbe_mode_ib),
492 				 GFP_KERNEL);
493 	if (!par->vbe_modes)
494 		return -ENOMEM;
495 
496 	/* Get info about all available modes. */
497 	mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
498 	while (*mode != 0xffff) {
499 		struct vbe_mode_ib *mib;
500 
501 		uvesafb_reset(task);
502 		task->t.regs.eax = 0x4f01;
503 		task->t.regs.ecx = (u32) *mode;
504 		task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
505 		task->t.buf_len = sizeof(struct vbe_mode_ib);
506 		task->buf = par->vbe_modes + off;
507 
508 		err = uvesafb_exec(task);
509 		if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
510 			pr_warn("Getting mode info block for mode 0x%x failed (eax=0x%x, err=%d)\n",
511 				*mode, (u32)task->t.regs.eax, err);
512 			mode++;
513 			par->vbe_modes_cnt--;
514 			continue;
515 		}
516 
517 		mib = task->buf;
518 		mib->mode_id = *mode;
519 
520 		/*
521 		 * We only want modes that are supported with the current
522 		 * hardware configuration, color, graphics and that have
523 		 * support for the LFB.
524 		 */
525 		if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
526 				 mib->bits_per_pixel >= 8)
527 			off++;
528 		else
529 			par->vbe_modes_cnt--;
530 
531 		mode++;
532 		mib->depth = mib->red_len + mib->green_len + mib->blue_len;
533 
534 		/*
535 		 * Handle 8bpp modes and modes with broken color component
536 		 * lengths.
537 		 */
538 		if (mib->depth == 0 || (mib->depth == 24 &&
539 					mib->bits_per_pixel == 32))
540 			mib->depth = mib->bits_per_pixel;
541 	}
542 
543 	if (par->vbe_modes_cnt > 0)
544 		return 0;
545 	else
546 		return -EINVAL;
547 }
548 
549 /*
550  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
551  * x86 and not x86_64.
552  */
553 #ifdef CONFIG_X86_32
uvesafb_vbe_getpmi(struct uvesafb_ktask * task,struct uvesafb_par * par)554 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
555 			      struct uvesafb_par *par)
556 {
557 	int i, err;
558 
559 	uvesafb_reset(task);
560 	task->t.regs.eax = 0x4f0a;
561 	task->t.regs.ebx = 0x0;
562 	err = uvesafb_exec(task);
563 	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  */
uvesafb_is_valid_mode(struct fb_videomode * mode,struct fb_info * info)599 static 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 
uvesafb_vbe_getedid(struct uvesafb_ktask * task,struct fb_info * info)615 static 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 
uvesafb_vbe_getmonspecs(struct uvesafb_ktask * task,struct fb_info * info)676 static 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 
uvesafb_vbe_getstatesize(struct uvesafb_ktask * task,struct uvesafb_par * par)755 static 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 
uvesafb_vbe_init(struct fb_info * info)783 static 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 
823 out:	uvesafb_free(task);
824 	return err;
825 }
826 
uvesafb_vbe_init_mode(struct fb_info * info)827 static 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 
912 gotmode:
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 
uvesafb_setpalette(struct uvesafb_pal_entry * entries,int count,int start,struct fb_info * info)924 static 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 
uvesafb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)989 static 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 
uvesafb_setcmap(struct fb_cmap * cmap,struct fb_info * info)1040 static 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 
uvesafb_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)1079 static 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 
uvesafb_blank(int blank,struct fb_info * info)1106 static 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;
1160 out:		uvesafb_free(task);
1161 	}
1162 	return err;
1163 }
1164 
uvesafb_open(struct fb_info * info,int user)1165 static 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 
uvesafb_release(struct fb_info * info,int user)1185 static 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);
1210 out:
1211 	atomic_dec(&par->ref_count);
1212 	uvesafb_free(task);
1213 	return 0;
1214 }
1215 
uvesafb_set_par(struct fb_info * info)1216 static 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;
1238 setmode:
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 
1322 out:
1323 	kfree(crtc);
1324 	uvesafb_free(task);
1325 
1326 	return err;
1327 }
1328 
uvesafb_check_limits(struct fb_var_screeninfo * var,struct fb_info * info)1329 static 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 
uvesafb_check_var(struct fb_var_screeninfo * var,struct fb_info * info)1365 static 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 
1415 static struct fb_ops uvesafb_ops = {
1416 	.owner		= THIS_MODULE,
1417 	.fb_open	= uvesafb_open,
1418 	.fb_release	= uvesafb_release,
1419 	FB_DEFAULT_IOMEM_OPS,
1420 	.fb_setcolreg	= uvesafb_setcolreg,
1421 	.fb_setcmap	= uvesafb_setcmap,
1422 	.fb_pan_display	= uvesafb_pan_display,
1423 	.fb_blank	= uvesafb_blank,
1424 	.fb_check_var	= uvesafb_check_var,
1425 	.fb_set_par	= uvesafb_set_par,
1426 };
1427 
uvesafb_init_info(struct fb_info * info,struct vbe_mode_ib * mode)1428 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1429 {
1430 	unsigned int size_vmode;
1431 	unsigned int size_remap;
1432 	unsigned int size_total;
1433 	struct uvesafb_par *par = info->par;
1434 	int i, h;
1435 
1436 	info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1437 	info->fix = uvesafb_fix;
1438 	info->fix.ypanstep = par->ypan ? 1 : 0;
1439 	info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1440 
1441 	/* Disable blanking if the user requested so. */
1442 	if (!blank)
1443 		uvesafb_ops.fb_blank = NULL;
1444 
1445 	/*
1446 	 * Find out how much IO memory is required for the mode with
1447 	 * the highest resolution.
1448 	 */
1449 	size_remap = 0;
1450 	for (i = 0; i < par->vbe_modes_cnt; i++) {
1451 		h = par->vbe_modes[i].bytes_per_scan_line *
1452 					par->vbe_modes[i].y_res;
1453 		if (h > size_remap)
1454 			size_remap = h;
1455 	}
1456 	size_remap *= 2;
1457 
1458 	/*
1459 	 *   size_vmode -- that is the amount of memory needed for the
1460 	 *                 used video mode, i.e. the minimum amount of
1461 	 *                 memory we need.
1462 	 */
1463 	size_vmode = info->var.yres * mode->bytes_per_scan_line;
1464 
1465 	/*
1466 	 *   size_total -- all video memory we have. Used for mtrr
1467 	 *                 entries, resource allocation and bounds
1468 	 *                 checking.
1469 	 */
1470 	size_total = par->vbe_ib.total_memory * 65536;
1471 	if (vram_total)
1472 		size_total = vram_total * 1024 * 1024;
1473 	if (size_total < size_vmode)
1474 		size_total = size_vmode;
1475 
1476 	/*
1477 	 *   size_remap -- the amount of video memory we are going to
1478 	 *                 use for vesafb.  With modern cards it is no
1479 	 *                 option to simply use size_total as th
1480 	 *                 wastes plenty of kernel address space.
1481 	 */
1482 	if (vram_remap)
1483 		size_remap = vram_remap * 1024 * 1024;
1484 	if (size_remap < size_vmode)
1485 		size_remap = size_vmode;
1486 	if (size_remap > size_total)
1487 		size_remap = size_total;
1488 
1489 	info->fix.smem_len = size_remap;
1490 	info->fix.smem_start = mode->phys_base_ptr;
1491 
1492 	/*
1493 	 * We have to set yres_virtual here because when setup_var() was
1494 	 * called, smem_len wasn't defined yet.
1495 	 */
1496 	info->var.yres_virtual = info->fix.smem_len /
1497 				 mode->bytes_per_scan_line;
1498 
1499 	if (par->ypan && info->var.yres_virtual > info->var.yres) {
1500 		pr_info("scrolling: %s using protected mode interface, yres_virtual=%d\n",
1501 			(par->ypan > 1) ? "ywrap" : "ypan",
1502 			info->var.yres_virtual);
1503 	} else {
1504 		pr_info("scrolling: redraw\n");
1505 		info->var.yres_virtual = info->var.yres;
1506 		par->ypan = 0;
1507 	}
1508 
1509 	info->flags = (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1510 
1511 	if (!par->ypan)
1512 		uvesafb_ops.fb_pan_display = NULL;
1513 }
1514 
uvesafb_init_mtrr(struct fb_info * info)1515 static void uvesafb_init_mtrr(struct fb_info *info)
1516 {
1517 	struct uvesafb_par *par = info->par;
1518 
1519 	if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1520 		int temp_size = info->fix.smem_len;
1521 
1522 		int rc;
1523 
1524 		/* Find the largest power-of-two */
1525 		temp_size = roundup_pow_of_two(temp_size);
1526 
1527 		/* Try and find a power of two to add */
1528 		do {
1529 			rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1530 			temp_size >>= 1;
1531 		} while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1532 
1533 		if (rc >= 0)
1534 			par->mtrr_handle = rc;
1535 	}
1536 }
1537 
uvesafb_ioremap(struct fb_info * info)1538 static void uvesafb_ioremap(struct fb_info *info)
1539 {
1540 	info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1541 }
1542 
uvesafb_show_vbe_ver(struct device * dev,struct device_attribute * attr,char * buf)1543 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1544 		struct device_attribute *attr, char *buf)
1545 {
1546 	struct fb_info *info = dev_get_drvdata(dev);
1547 	struct uvesafb_par *par = info->par;
1548 
1549 	return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1550 }
1551 
1552 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1553 
uvesafb_show_vbe_modes(struct device * dev,struct device_attribute * attr,char * buf)1554 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1555 		struct device_attribute *attr, char *buf)
1556 {
1557 	struct fb_info *info = dev_get_drvdata(dev);
1558 	struct uvesafb_par *par = info->par;
1559 	int ret = 0, i;
1560 
1561 	for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1562 		ret += scnprintf(buf + ret, PAGE_SIZE - ret,
1563 			"%dx%d-%d, 0x%.4x\n",
1564 			par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1565 			par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1566 	}
1567 
1568 	return ret;
1569 }
1570 
1571 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1572 
uvesafb_show_vendor(struct device * dev,struct device_attribute * attr,char * buf)1573 static ssize_t uvesafb_show_vendor(struct device *dev,
1574 		struct device_attribute *attr, char *buf)
1575 {
1576 	struct fb_info *info = dev_get_drvdata(dev);
1577 	struct uvesafb_par *par = info->par;
1578 
1579 	if (par->vbe_ib.oem_vendor_name_ptr)
1580 		return sysfs_emit(buf, "%s\n", (char *)
1581 			(&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1582 	else
1583 		return 0;
1584 }
1585 
1586 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1587 
uvesafb_show_product_name(struct device * dev,struct device_attribute * attr,char * buf)1588 static ssize_t uvesafb_show_product_name(struct device *dev,
1589 		struct device_attribute *attr, char *buf)
1590 {
1591 	struct fb_info *info = dev_get_drvdata(dev);
1592 	struct uvesafb_par *par = info->par;
1593 
1594 	if (par->vbe_ib.oem_product_name_ptr)
1595 		return sysfs_emit(buf, "%s\n", (char *)
1596 			(&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1597 	else
1598 		return 0;
1599 }
1600 
1601 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1602 
uvesafb_show_product_rev(struct device * dev,struct device_attribute * attr,char * buf)1603 static ssize_t uvesafb_show_product_rev(struct device *dev,
1604 		struct device_attribute *attr, char *buf)
1605 {
1606 	struct fb_info *info = dev_get_drvdata(dev);
1607 	struct uvesafb_par *par = info->par;
1608 
1609 	if (par->vbe_ib.oem_product_rev_ptr)
1610 		return sysfs_emit(buf, "%s\n", (char *)
1611 			(&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1612 	else
1613 		return 0;
1614 }
1615 
1616 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1617 
uvesafb_show_oem_string(struct device * dev,struct device_attribute * attr,char * buf)1618 static ssize_t uvesafb_show_oem_string(struct device *dev,
1619 		struct device_attribute *attr, char *buf)
1620 {
1621 	struct fb_info *info = dev_get_drvdata(dev);
1622 	struct uvesafb_par *par = info->par;
1623 
1624 	if (par->vbe_ib.oem_string_ptr)
1625 		return sysfs_emit(buf, "%s\n",
1626 			(char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1627 	else
1628 		return 0;
1629 }
1630 
1631 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1632 
uvesafb_show_nocrtc(struct device * dev,struct device_attribute * attr,char * buf)1633 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1634 		struct device_attribute *attr, char *buf)
1635 {
1636 	struct fb_info *info = dev_get_drvdata(dev);
1637 	struct uvesafb_par *par = info->par;
1638 
1639 	return sysfs_emit(buf, "%d\n", par->nocrtc);
1640 }
1641 
uvesafb_store_nocrtc(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1642 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1643 		struct device_attribute *attr, const char *buf, size_t count)
1644 {
1645 	struct fb_info *info = dev_get_drvdata(dev);
1646 	struct uvesafb_par *par = info->par;
1647 
1648 	if (count > 0) {
1649 		if (buf[0] == '0')
1650 			par->nocrtc = 0;
1651 		else
1652 			par->nocrtc = 1;
1653 	}
1654 	return count;
1655 }
1656 
1657 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1658 			uvesafb_store_nocrtc);
1659 
1660 static struct attribute *uvesafb_dev_attrs[] = {
1661 	&dev_attr_vbe_version.attr,
1662 	&dev_attr_vbe_modes.attr,
1663 	&dev_attr_oem_vendor.attr,
1664 	&dev_attr_oem_product_name.attr,
1665 	&dev_attr_oem_product_rev.attr,
1666 	&dev_attr_oem_string.attr,
1667 	&dev_attr_nocrtc.attr,
1668 	NULL,
1669 };
1670 
1671 static const struct attribute_group uvesafb_dev_attgrp = {
1672 	.name = NULL,
1673 	.attrs = uvesafb_dev_attrs,
1674 };
1675 
uvesafb_probe(struct platform_device * dev)1676 static int uvesafb_probe(struct platform_device *dev)
1677 {
1678 	struct fb_info *info;
1679 	struct vbe_mode_ib *mode = NULL;
1680 	struct uvesafb_par *par;
1681 	int err = 0, i;
1682 
1683 	info = framebuffer_alloc(sizeof(*par) +	sizeof(u32) * 256, &dev->dev);
1684 	if (!info)
1685 		return -ENOMEM;
1686 
1687 	par = info->par;
1688 
1689 	err = uvesafb_vbe_init(info);
1690 	if (err) {
1691 		pr_err("vbe_init() failed with %d\n", err);
1692 		goto out;
1693 	}
1694 
1695 	info->fbops = &uvesafb_ops;
1696 
1697 	i = uvesafb_vbe_init_mode(info);
1698 	if (i < 0) {
1699 		err = -EINVAL;
1700 		goto out;
1701 	} else {
1702 		mode = &par->vbe_modes[i];
1703 	}
1704 
1705 	if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1706 		err = -ENXIO;
1707 		goto out;
1708 	}
1709 
1710 	uvesafb_init_info(info, mode);
1711 
1712 	if (!request_region(0x3c0, 32, "uvesafb")) {
1713 		pr_err("request region 0x3c0-0x3e0 failed\n");
1714 		err = -EIO;
1715 		goto out_mode;
1716 	}
1717 
1718 	if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1719 				"uvesafb")) {
1720 		pr_err("cannot reserve video memory at 0x%lx\n",
1721 		       info->fix.smem_start);
1722 		err = -EIO;
1723 		goto out_reg;
1724 	}
1725 
1726 	uvesafb_init_mtrr(info);
1727 	uvesafb_ioremap(info);
1728 
1729 	if (!info->screen_base) {
1730 		pr_err("abort, cannot ioremap 0x%x bytes of video memory at 0x%lx\n",
1731 		       info->fix.smem_len, info->fix.smem_start);
1732 		err = -EIO;
1733 		goto out_mem;
1734 	}
1735 
1736 	platform_set_drvdata(dev, info);
1737 
1738 	if (register_framebuffer(info) < 0) {
1739 		pr_err("failed to register framebuffer device\n");
1740 		err = -EINVAL;
1741 		goto out_unmap;
1742 	}
1743 
1744 	pr_info("framebuffer at 0x%lx, mapped to 0x%p, using %dk, total %dk\n",
1745 		info->fix.smem_start, info->screen_base,
1746 		info->fix.smem_len / 1024, par->vbe_ib.total_memory * 64);
1747 	fb_info(info, "%s frame buffer device\n", info->fix.id);
1748 
1749 	err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1750 	if (err != 0)
1751 		fb_warn(info, "failed to register attributes\n");
1752 
1753 	return 0;
1754 
1755 out_unmap:
1756 	iounmap(info->screen_base);
1757 out_mem:
1758 	arch_phys_wc_del(par->mtrr_handle);
1759 	release_mem_region(info->fix.smem_start, info->fix.smem_len);
1760 out_reg:
1761 	release_region(0x3c0, 32);
1762 out_mode:
1763 	if (!list_empty(&info->modelist))
1764 		fb_destroy_modelist(&info->modelist);
1765 	fb_destroy_modedb(info->monspecs.modedb);
1766 	fb_dealloc_cmap(&info->cmap);
1767 out:
1768 	kfree(par->vbe_modes);
1769 
1770 	framebuffer_release(info);
1771 	return err;
1772 }
1773 
uvesafb_remove(struct platform_device * dev)1774 static void uvesafb_remove(struct platform_device *dev)
1775 {
1776 	struct fb_info *info = platform_get_drvdata(dev);
1777 	struct uvesafb_par *par = info->par;
1778 
1779 	sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1780 	unregister_framebuffer(info);
1781 	release_region(0x3c0, 32);
1782 	iounmap(info->screen_base);
1783 	arch_phys_wc_del(par->mtrr_handle);
1784 	release_mem_region(info->fix.smem_start, info->fix.smem_len);
1785 	fb_destroy_modedb(info->monspecs.modedb);
1786 	fb_dealloc_cmap(&info->cmap);
1787 
1788 	kfree(par->vbe_modes);
1789 	kfree(par->vbe_state_orig);
1790 	kfree(par->vbe_state_saved);
1791 
1792 	framebuffer_release(info);
1793 }
1794 
1795 static struct platform_driver uvesafb_driver = {
1796 	.probe  = uvesafb_probe,
1797 	.remove_new = uvesafb_remove,
1798 	.driver = {
1799 		.name = "uvesafb",
1800 	},
1801 };
1802 
1803 static struct platform_device *uvesafb_device;
1804 
1805 #ifndef MODULE
uvesafb_setup(char * options)1806 static int uvesafb_setup(char *options)
1807 {
1808 	char *this_opt;
1809 
1810 	if (!options || !*options)
1811 		return 0;
1812 
1813 	while ((this_opt = strsep(&options, ",")) != NULL) {
1814 		if (!*this_opt) continue;
1815 
1816 		if (!strcmp(this_opt, "redraw"))
1817 			ypan = 0;
1818 		else if (!strcmp(this_opt, "ypan"))
1819 			ypan = 1;
1820 		else if (!strcmp(this_opt, "ywrap"))
1821 			ypan = 2;
1822 		else if (!strcmp(this_opt, "vgapal"))
1823 			pmi_setpal = false;
1824 		else if (!strcmp(this_opt, "pmipal"))
1825 			pmi_setpal = true;
1826 		else if (!strncmp(this_opt, "mtrr:", 5))
1827 			mtrr = simple_strtoul(this_opt+5, NULL, 0);
1828 		else if (!strcmp(this_opt, "nomtrr"))
1829 			mtrr = 0;
1830 		else if (!strcmp(this_opt, "nocrtc"))
1831 			nocrtc = true;
1832 		else if (!strcmp(this_opt, "noedid"))
1833 			noedid = true;
1834 		else if (!strcmp(this_opt, "noblank"))
1835 			blank = false;
1836 		else if (!strncmp(this_opt, "vtotal:", 7))
1837 			vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1838 		else if (!strncmp(this_opt, "vremap:", 7))
1839 			vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1840 		else if (!strncmp(this_opt, "maxhf:", 6))
1841 			maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1842 		else if (!strncmp(this_opt, "maxvf:", 6))
1843 			maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1844 		else if (!strncmp(this_opt, "maxclk:", 7))
1845 			maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1846 		else if (!strncmp(this_opt, "vbemode:", 8))
1847 			vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1848 		else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1849 			mode_option = this_opt;
1850 		} else {
1851 			pr_warn("unrecognized option %s\n", this_opt);
1852 		}
1853 	}
1854 
1855 	if (mtrr != 3 && mtrr != 0)
1856 		pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1857 
1858 	return 0;
1859 }
1860 #endif /* !MODULE */
1861 
v86d_show(struct device_driver * dev,char * buf)1862 static ssize_t v86d_show(struct device_driver *dev, char *buf)
1863 {
1864 	return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1865 }
1866 
v86d_store(struct device_driver * dev,const char * buf,size_t count)1867 static ssize_t v86d_store(struct device_driver *dev, const char *buf,
1868 		size_t count)
1869 {
1870 	strncpy(v86d_path, buf, PATH_MAX - 1);
1871 	return count;
1872 }
1873 static DRIVER_ATTR_RW(v86d);
1874 
uvesafb_init(void)1875 static int uvesafb_init(void)
1876 {
1877 	int err;
1878 
1879 #ifndef MODULE
1880 	char *option = NULL;
1881 
1882 	if (fb_get_options("uvesafb", &option))
1883 		return -ENODEV;
1884 	uvesafb_setup(option);
1885 #endif
1886 	err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1887 	if (err)
1888 		return err;
1889 
1890 	err = platform_driver_register(&uvesafb_driver);
1891 
1892 	if (!err) {
1893 		uvesafb_device = platform_device_alloc("uvesafb", 0);
1894 		if (uvesafb_device)
1895 			err = platform_device_add(uvesafb_device);
1896 		else
1897 			err = -ENOMEM;
1898 
1899 		if (err) {
1900 			platform_device_put(uvesafb_device);
1901 			platform_driver_unregister(&uvesafb_driver);
1902 			cn_del_callback(&uvesafb_cn_id);
1903 			return err;
1904 		}
1905 
1906 		err = driver_create_file(&uvesafb_driver.driver,
1907 				&driver_attr_v86d);
1908 		if (err) {
1909 			pr_warn("failed to register attributes\n");
1910 			err = 0;
1911 		}
1912 	}
1913 	return err;
1914 }
1915 
1916 module_init(uvesafb_init);
1917 
uvesafb_exit(void)1918 static void uvesafb_exit(void)
1919 {
1920 	struct uvesafb_ktask *task;
1921 
1922 	if (v86d_started) {
1923 		task = uvesafb_prep();
1924 		if (task) {
1925 			task->t.flags = TF_EXIT;
1926 			uvesafb_exec(task);
1927 			uvesafb_free(task);
1928 		}
1929 	}
1930 
1931 	driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1932 	platform_device_unregister(uvesafb_device);
1933 	platform_driver_unregister(&uvesafb_driver);
1934 	cn_del_callback(&uvesafb_cn_id);
1935 }
1936 
1937 module_exit(uvesafb_exit);
1938 
param_set_scroll(const char * val,const struct kernel_param * kp)1939 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1940 {
1941 	ypan = 0;
1942 
1943 	if (!strcmp(val, "redraw"))
1944 		ypan = 0;
1945 	else if (!strcmp(val, "ypan"))
1946 		ypan = 1;
1947 	else if (!strcmp(val, "ywrap"))
1948 		ypan = 2;
1949 	else
1950 		return -EINVAL;
1951 
1952 	return 0;
1953 }
1954 static const struct kernel_param_ops param_ops_scroll = {
1955 	.set = param_set_scroll,
1956 };
1957 #define param_check_scroll(name, p) __param_check(name, p, void)
1958 
1959 module_param_named(scroll, ypan, scroll, 0);
1960 MODULE_PARM_DESC(scroll,
1961 	"Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1962 module_param_named(vgapal, pmi_setpal, invbool, 0);
1963 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1964 module_param_named(pmipal, pmi_setpal, bool, 0);
1965 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1966 module_param(mtrr, uint, 0);
1967 MODULE_PARM_DESC(mtrr,
1968 	"Memory Type Range Registers setting. Use 0 to disable.");
1969 module_param(blank, bool, 0);
1970 MODULE_PARM_DESC(blank, "Enable hardware blanking");
1971 module_param(nocrtc, bool, 0);
1972 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1973 module_param(noedid, bool, 0);
1974 MODULE_PARM_DESC(noedid,
1975 	"Ignore EDID-provided monitor limits when setting modes");
1976 module_param(vram_remap, uint, 0);
1977 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
1978 module_param(vram_total, uint, 0);
1979 MODULE_PARM_DESC(vram_total, "Set total amount of video memory [MiB]");
1980 module_param(maxclk, ushort, 0);
1981 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
1982 module_param(maxhf, ushort, 0);
1983 MODULE_PARM_DESC(maxhf,
1984 	"Maximum horizontal frequency [kHz], overrides EDID data");
1985 module_param(maxvf, ushort, 0);
1986 MODULE_PARM_DESC(maxvf,
1987 	"Maximum vertical frequency [Hz], overrides EDID data");
1988 module_param(mode_option, charp, 0);
1989 MODULE_PARM_DESC(mode_option,
1990 	"Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
1991 module_param(vbemode, ushort, 0);
1992 MODULE_PARM_DESC(vbemode,
1993 	"VBE mode number to set, overrides the 'mode' option");
1994 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
1995 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
1996 
1997 MODULE_LICENSE("GPL");
1998 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
1999 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2000 
2001