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video: fbdev: fix OOB read in vga_8planes_imageblit()
[people/arne_f/kernel.git] / drivers / video / fbdev / vga16fb.c
1 /*
2 * linux/drivers/video/vga16.c -- VGA 16-color framebuffer driver
3 *
4 * Copyright 1999 Ben Pfaff <pfaffben@debian.org> and Petr Vandrovec <VANDROVE@vc.cvut.cz>
5 * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
6 * Based on VESA framebuffer (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
7 *
8 * This file is subject to the terms and conditions of the GNU General
9 * Public License. See the file COPYING in the main directory of this
10 * archive for more details.
11 */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/errno.h>
16 #include <linux/string.h>
17 #include <linux/mm.h>
18 #include <linux/delay.h>
19 #include <linux/fb.h>
20 #include <linux/ioport.h>
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23 #include <linux/screen_info.h>
24
25 #include <asm/io.h>
26 #include <video/vga.h>
27
28 #define VGA_FB_PHYS 0xA0000
29 #define VGA_FB_PHYS_LEN 65536
30
31 #define MODE_SKIP4 1
32 #define MODE_8BPP 2
33 #define MODE_CFB 4
34 #define MODE_TEXT 8
35
36 /* --------------------------------------------------------------------- */
37
38 /*
39 * card parameters
40 */
41
42 struct vga16fb_par {
43 /* structure holding original VGA register settings when the
44 screen is blanked */
45 struct {
46 unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
47 unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
48 unsigned char CrtMiscIO; /* Miscellaneous register */
49 unsigned char HorizontalTotal; /* CRT-Controller:00h */
50 unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
51 unsigned char StartHorizRetrace;/* CRT-Controller:04h */
52 unsigned char EndHorizRetrace; /* CRT-Controller:05h */
53 unsigned char Overflow; /* CRT-Controller:07h */
54 unsigned char StartVertRetrace; /* CRT-Controller:10h */
55 unsigned char EndVertRetrace; /* CRT-Controller:11h */
56 unsigned char ModeControl; /* CRT-Controller:17h */
57 unsigned char ClockingMode; /* Seq-Controller:01h */
58 } vga_state;
59 struct vgastate state;
60 unsigned int ref_count;
61 int palette_blanked, vesa_blanked, mode, isVGA;
62 u8 misc, pel_msk, vss, clkdiv;
63 u8 crtc[VGA_CRT_C];
64 };
65
66 /* --------------------------------------------------------------------- */
67
68 static struct fb_var_screeninfo vga16fb_defined = {
69 .xres = 640,
70 .yres = 480,
71 .xres_virtual = 640,
72 .yres_virtual = 480,
73 .bits_per_pixel = 4,
74 .activate = FB_ACTIVATE_TEST,
75 .height = -1,
76 .width = -1,
77 .pixclock = 39721,
78 .left_margin = 48,
79 .right_margin = 16,
80 .upper_margin = 33,
81 .lower_margin = 10,
82 .hsync_len = 96,
83 .vsync_len = 2,
84 .vmode = FB_VMODE_NONINTERLACED,
85 };
86
87 /* name should not depend on EGA/VGA */
88 static const struct fb_fix_screeninfo vga16fb_fix = {
89 .id = "VGA16 VGA",
90 .smem_start = VGA_FB_PHYS,
91 .smem_len = VGA_FB_PHYS_LEN,
92 .type = FB_TYPE_VGA_PLANES,
93 .type_aux = FB_AUX_VGA_PLANES_VGA4,
94 .visual = FB_VISUAL_PSEUDOCOLOR,
95 .xpanstep = 8,
96 .ypanstep = 1,
97 .line_length = 640 / 8,
98 .accel = FB_ACCEL_NONE
99 };
100
101 /* The VGA's weird architecture often requires that we read a byte and
102 write a byte to the same location. It doesn't matter *what* byte
103 we write, however. This is because all the action goes on behind
104 the scenes in the VGA's 32-bit latch register, and reading and writing
105 video memory just invokes latch behavior.
106
107 To avoid race conditions (is this necessary?), reading and writing
108 the memory byte should be done with a single instruction. One
109 suitable instruction is the x86 bitwise OR. The following
110 read-modify-write routine should optimize to one such bitwise
111 OR. */
112 static inline void rmw(volatile char __iomem *p)
113 {
114 readb(p);
115 writeb(1, p);
116 }
117
118 /* Set the Graphics Mode Register, and return its previous value.
119 Bits 0-1 are write mode, bit 3 is read mode. */
120 static inline int setmode(int mode)
121 {
122 int oldmode;
123
124 oldmode = vga_io_rgfx(VGA_GFX_MODE);
125 vga_io_w(VGA_GFX_D, mode);
126 return oldmode;
127 }
128
129 /* Select the Bit Mask Register and return its value. */
130 static inline int selectmask(void)
131 {
132 return vga_io_rgfx(VGA_GFX_BIT_MASK);
133 }
134
135 /* Set the value of the Bit Mask Register. It must already have been
136 selected with selectmask(). */
137 static inline void setmask(int mask)
138 {
139 vga_io_w(VGA_GFX_D, mask);
140 }
141
142 /* Set the Data Rotate Register and return its old value.
143 Bits 0-2 are rotate count, bits 3-4 are logical operation
144 (0=NOP, 1=AND, 2=OR, 3=XOR). */
145 static inline int setop(int op)
146 {
147 int oldop;
148
149 oldop = vga_io_rgfx(VGA_GFX_DATA_ROTATE);
150 vga_io_w(VGA_GFX_D, op);
151 return oldop;
152 }
153
154 /* Set the Enable Set/Reset Register and return its old value.
155 The code here always uses value 0xf for this register. */
156 static inline int setsr(int sr)
157 {
158 int oldsr;
159
160 oldsr = vga_io_rgfx(VGA_GFX_SR_ENABLE);
161 vga_io_w(VGA_GFX_D, sr);
162 return oldsr;
163 }
164
165 /* Set the Set/Reset Register and return its old value. */
166 static inline int setcolor(int color)
167 {
168 int oldcolor;
169
170 oldcolor = vga_io_rgfx(VGA_GFX_SR_VALUE);
171 vga_io_w(VGA_GFX_D, color);
172 return oldcolor;
173 }
174
175 /* Return the value in the Graphics Address Register. */
176 static inline int getindex(void)
177 {
178 return vga_io_r(VGA_GFX_I);
179 }
180
181 /* Set the value in the Graphics Address Register. */
182 static inline void setindex(int index)
183 {
184 vga_io_w(VGA_GFX_I, index);
185 }
186
187 static void vga16fb_pan_var(struct fb_info *info,
188 struct fb_var_screeninfo *var)
189 {
190 struct vga16fb_par *par = info->par;
191 u32 xoffset, pos;
192
193 xoffset = var->xoffset;
194 if (info->var.bits_per_pixel == 8) {
195 pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 2;
196 } else if (par->mode & MODE_TEXT) {
197 int fh = 16; // FIXME !!! font height. Fugde for now.
198 pos = (info->var.xres_virtual * (var->yoffset / fh) + xoffset) >> 3;
199 } else {
200 if (info->var.nonstd)
201 xoffset--;
202 pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 3;
203 }
204 vga_io_wcrt(VGA_CRTC_START_HI, pos >> 8);
205 vga_io_wcrt(VGA_CRTC_START_LO, pos & 0xFF);
206 /* if we support CFB4, then we must! support xoffset with pixel
207 * granularity if someone supports xoffset in bit resolution */
208 vga_io_r(VGA_IS1_RC); /* reset flip-flop */
209 vga_io_w(VGA_ATT_IW, VGA_ATC_PEL);
210 if (info->var.bits_per_pixel == 8)
211 vga_io_w(VGA_ATT_IW, (xoffset & 3) << 1);
212 else
213 vga_io_w(VGA_ATT_IW, xoffset & 7);
214 vga_io_r(VGA_IS1_RC);
215 vga_io_w(VGA_ATT_IW, 0x20);
216 }
217
218 static void vga16fb_update_fix(struct fb_info *info)
219 {
220 if (info->var.bits_per_pixel == 4) {
221 if (info->var.nonstd) {
222 info->fix.type = FB_TYPE_PACKED_PIXELS;
223 info->fix.line_length = info->var.xres_virtual / 2;
224 } else {
225 info->fix.type = FB_TYPE_VGA_PLANES;
226 info->fix.type_aux = FB_AUX_VGA_PLANES_VGA4;
227 info->fix.line_length = info->var.xres_virtual / 8;
228 }
229 } else if (info->var.bits_per_pixel == 0) {
230 info->fix.type = FB_TYPE_TEXT;
231 info->fix.type_aux = FB_AUX_TEXT_CGA;
232 info->fix.line_length = info->var.xres_virtual / 4;
233 } else { /* 8bpp */
234 if (info->var.nonstd) {
235 info->fix.type = FB_TYPE_VGA_PLANES;
236 info->fix.type_aux = FB_AUX_VGA_PLANES_CFB8;
237 info->fix.line_length = info->var.xres_virtual / 4;
238 } else {
239 info->fix.type = FB_TYPE_PACKED_PIXELS;
240 info->fix.line_length = info->var.xres_virtual;
241 }
242 }
243 }
244
245 static void vga16fb_clock_chip(struct vga16fb_par *par,
246 unsigned int pixclock,
247 const struct fb_info *info,
248 int mul, int div)
249 {
250 static const struct {
251 u32 pixclock;
252 u8 misc;
253 u8 seq_clock_mode;
254 } *ptr, *best, vgaclocks[] = {
255 { 79442 /* 12.587 */, 0x00, 0x08},
256 { 70616 /* 14.161 */, 0x04, 0x08},
257 { 39721 /* 25.175 */, 0x00, 0x00},
258 { 35308 /* 28.322 */, 0x04, 0x00},
259 { 0 /* bad */, 0x00, 0x00}};
260 int err;
261
262 pixclock = (pixclock * mul) / div;
263 best = vgaclocks;
264 err = pixclock - best->pixclock;
265 if (err < 0) err = -err;
266 for (ptr = vgaclocks + 1; ptr->pixclock; ptr++) {
267 int tmp;
268
269 tmp = pixclock - ptr->pixclock;
270 if (tmp < 0) tmp = -tmp;
271 if (tmp < err) {
272 err = tmp;
273 best = ptr;
274 }
275 }
276 par->misc |= best->misc;
277 par->clkdiv = best->seq_clock_mode;
278 pixclock = (best->pixclock * div) / mul;
279 }
280
281 #define FAIL(X) return -EINVAL
282
283 static int vga16fb_open(struct fb_info *info, int user)
284 {
285 struct vga16fb_par *par = info->par;
286
287 if (!par->ref_count) {
288 memset(&par->state, 0, sizeof(struct vgastate));
289 par->state.flags = VGA_SAVE_FONTS | VGA_SAVE_MODE |
290 VGA_SAVE_CMAP;
291 save_vga(&par->state);
292 }
293 par->ref_count++;
294
295 return 0;
296 }
297
298 static int vga16fb_release(struct fb_info *info, int user)
299 {
300 struct vga16fb_par *par = info->par;
301
302 if (!par->ref_count)
303 return -EINVAL;
304
305 if (par->ref_count == 1)
306 restore_vga(&par->state);
307 par->ref_count--;
308
309 return 0;
310 }
311
312 static int vga16fb_check_var(struct fb_var_screeninfo *var,
313 struct fb_info *info)
314 {
315 struct vga16fb_par *par = info->par;
316 u32 xres, right, hslen, left, xtotal;
317 u32 yres, lower, vslen, upper, ytotal;
318 u32 vxres, xoffset, vyres, yoffset;
319 u32 pos;
320 u8 r7, rMode;
321 int shift;
322 int mode;
323 u32 maxmem;
324
325 par->pel_msk = 0xFF;
326
327 if (var->bits_per_pixel == 4) {
328 if (var->nonstd) {
329 if (!par->isVGA)
330 return -EINVAL;
331 shift = 3;
332 mode = MODE_SKIP4 | MODE_CFB;
333 maxmem = 16384;
334 par->pel_msk = 0x0F;
335 } else {
336 shift = 3;
337 mode = 0;
338 maxmem = 65536;
339 }
340 } else if (var->bits_per_pixel == 8) {
341 if (!par->isVGA)
342 return -EINVAL; /* no support on EGA */
343 shift = 2;
344 if (var->nonstd) {
345 mode = MODE_8BPP | MODE_CFB;
346 maxmem = 65536;
347 } else {
348 mode = MODE_SKIP4 | MODE_8BPP | MODE_CFB;
349 maxmem = 16384;
350 }
351 } else
352 return -EINVAL;
353
354 xres = (var->xres + 7) & ~7;
355 vxres = (var->xres_virtual + 0xF) & ~0xF;
356 xoffset = (var->xoffset + 7) & ~7;
357 left = (var->left_margin + 7) & ~7;
358 right = (var->right_margin + 7) & ~7;
359 hslen = (var->hsync_len + 7) & ~7;
360
361 if (vxres < xres)
362 vxres = xres;
363 if (xres + xoffset > vxres)
364 xoffset = vxres - xres;
365
366 var->xres = xres;
367 var->right_margin = right;
368 var->hsync_len = hslen;
369 var->left_margin = left;
370 var->xres_virtual = vxres;
371 var->xoffset = xoffset;
372
373 xres >>= shift;
374 right >>= shift;
375 hslen >>= shift;
376 left >>= shift;
377 vxres >>= shift;
378 xtotal = xres + right + hslen + left;
379 if (xtotal >= 256)
380 FAIL("xtotal too big");
381 if (hslen > 32)
382 FAIL("hslen too big");
383 if (right + hslen + left > 64)
384 FAIL("hblank too big");
385 par->crtc[VGA_CRTC_H_TOTAL] = xtotal - 5;
386 par->crtc[VGA_CRTC_H_BLANK_START] = xres - 1;
387 par->crtc[VGA_CRTC_H_DISP] = xres - 1;
388 pos = xres + right;
389 par->crtc[VGA_CRTC_H_SYNC_START] = pos;
390 pos += hslen;
391 par->crtc[VGA_CRTC_H_SYNC_END] = pos & 0x1F;
392 pos += left - 2; /* blank_end + 2 <= total + 5 */
393 par->crtc[VGA_CRTC_H_BLANK_END] = (pos & 0x1F) | 0x80;
394 if (pos & 0x20)
395 par->crtc[VGA_CRTC_H_SYNC_END] |= 0x80;
396
397 yres = var->yres;
398 lower = var->lower_margin;
399 vslen = var->vsync_len;
400 upper = var->upper_margin;
401 vyres = var->yres_virtual;
402 yoffset = var->yoffset;
403
404 if (yres > vyres)
405 vyres = yres;
406 if (vxres * vyres > maxmem) {
407 vyres = maxmem / vxres;
408 if (vyres < yres)
409 return -ENOMEM;
410 }
411 if (yoffset + yres > vyres)
412 yoffset = vyres - yres;
413 var->yres = yres;
414 var->lower_margin = lower;
415 var->vsync_len = vslen;
416 var->upper_margin = upper;
417 var->yres_virtual = vyres;
418 var->yoffset = yoffset;
419
420 if (var->vmode & FB_VMODE_DOUBLE) {
421 yres <<= 1;
422 lower <<= 1;
423 vslen <<= 1;
424 upper <<= 1;
425 }
426 ytotal = yres + lower + vslen + upper;
427 if (ytotal > 1024) {
428 ytotal >>= 1;
429 yres >>= 1;
430 lower >>= 1;
431 vslen >>= 1;
432 upper >>= 1;
433 rMode = 0x04;
434 } else
435 rMode = 0x00;
436 if (ytotal > 1024)
437 FAIL("ytotal too big");
438 if (vslen > 16)
439 FAIL("vslen too big");
440 par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;
441 r7 = 0x10; /* disable linecompare */
442 if (ytotal & 0x100) r7 |= 0x01;
443 if (ytotal & 0x200) r7 |= 0x20;
444 par->crtc[VGA_CRTC_PRESET_ROW] = 0;
445 par->crtc[VGA_CRTC_MAX_SCAN] = 0x40; /* 1 scanline, no linecmp */
446 if (var->vmode & FB_VMODE_DOUBLE)
447 par->crtc[VGA_CRTC_MAX_SCAN] |= 0x80;
448 par->crtc[VGA_CRTC_CURSOR_START] = 0x20;
449 par->crtc[VGA_CRTC_CURSOR_END] = 0x00;
450 if ((mode & (MODE_CFB | MODE_8BPP)) == MODE_CFB)
451 xoffset--;
452 pos = yoffset * vxres + (xoffset >> shift);
453 par->crtc[VGA_CRTC_START_HI] = pos >> 8;
454 par->crtc[VGA_CRTC_START_LO] = pos & 0xFF;
455 par->crtc[VGA_CRTC_CURSOR_HI] = 0x00;
456 par->crtc[VGA_CRTC_CURSOR_LO] = 0x00;
457 pos = yres - 1;
458 par->crtc[VGA_CRTC_V_DISP_END] = pos & 0xFF;
459 par->crtc[VGA_CRTC_V_BLANK_START] = pos & 0xFF;
460 if (pos & 0x100)
461 r7 |= 0x0A; /* 0x02 -> DISP_END, 0x08 -> BLANK_START */
462 if (pos & 0x200) {
463 r7 |= 0x40; /* 0x40 -> DISP_END */
464 par->crtc[VGA_CRTC_MAX_SCAN] |= 0x20; /* BLANK_START */
465 }
466 pos += lower;
467 par->crtc[VGA_CRTC_V_SYNC_START] = pos & 0xFF;
468 if (pos & 0x100)
469 r7 |= 0x04;
470 if (pos & 0x200)
471 r7 |= 0x80;
472 pos += vslen;
473 par->crtc[VGA_CRTC_V_SYNC_END] = (pos & 0x0F) & ~0x10; /* disabled IRQ */
474 pos += upper - 1; /* blank_end + 1 <= ytotal + 2 */
475 par->crtc[VGA_CRTC_V_BLANK_END] = pos & 0xFF; /* 0x7F for original VGA,
476 but some SVGA chips requires all 8 bits to set */
477 if (vxres >= 512)
478 FAIL("vxres too long");
479 par->crtc[VGA_CRTC_OFFSET] = vxres >> 1;
480 if (mode & MODE_SKIP4)
481 par->crtc[VGA_CRTC_UNDERLINE] = 0x5F; /* 256, cfb8 */
482 else
483 par->crtc[VGA_CRTC_UNDERLINE] = 0x1F; /* 16, vgap */
484 par->crtc[VGA_CRTC_MODE] = rMode | ((mode & MODE_TEXT) ? 0xA3 : 0xE3);
485 par->crtc[VGA_CRTC_LINE_COMPARE] = 0xFF;
486 par->crtc[VGA_CRTC_OVERFLOW] = r7;
487
488 par->vss = 0x00; /* 3DA */
489
490 par->misc = 0xE3; /* enable CPU, ports 0x3Dx, positive sync */
491 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
492 par->misc &= ~0x40;
493 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
494 par->misc &= ~0x80;
495
496 par->mode = mode;
497
498 if (mode & MODE_8BPP)
499 /* pixel clock == vga clock / 2 */
500 vga16fb_clock_chip(par, var->pixclock, info, 1, 2);
501 else
502 /* pixel clock == vga clock */
503 vga16fb_clock_chip(par, var->pixclock, info, 1, 1);
504
505 var->red.offset = var->green.offset = var->blue.offset =
506 var->transp.offset = 0;
507 var->red.length = var->green.length = var->blue.length =
508 (par->isVGA) ? 6 : 2;
509 var->transp.length = 0;
510 var->activate = FB_ACTIVATE_NOW;
511 var->height = -1;
512 var->width = -1;
513 var->accel_flags = 0;
514 return 0;
515 }
516 #undef FAIL
517
518 static int vga16fb_set_par(struct fb_info *info)
519 {
520 struct vga16fb_par *par = info->par;
521 u8 gdc[VGA_GFX_C];
522 u8 seq[VGA_SEQ_C];
523 u8 atc[VGA_ATT_C];
524 int fh, i;
525
526 seq[VGA_SEQ_CLOCK_MODE] = 0x01 | par->clkdiv;
527 if (par->mode & MODE_TEXT)
528 seq[VGA_SEQ_PLANE_WRITE] = 0x03;
529 else
530 seq[VGA_SEQ_PLANE_WRITE] = 0x0F;
531 seq[VGA_SEQ_CHARACTER_MAP] = 0x00;
532 if (par->mode & MODE_TEXT)
533 seq[VGA_SEQ_MEMORY_MODE] = 0x03;
534 else if (par->mode & MODE_SKIP4)
535 seq[VGA_SEQ_MEMORY_MODE] = 0x0E;
536 else
537 seq[VGA_SEQ_MEMORY_MODE] = 0x06;
538
539 gdc[VGA_GFX_SR_VALUE] = 0x00;
540 gdc[VGA_GFX_SR_ENABLE] = 0x00;
541 gdc[VGA_GFX_COMPARE_VALUE] = 0x00;
542 gdc[VGA_GFX_DATA_ROTATE] = 0x00;
543 gdc[VGA_GFX_PLANE_READ] = 0;
544 if (par->mode & MODE_TEXT) {
545 gdc[VGA_GFX_MODE] = 0x10;
546 gdc[VGA_GFX_MISC] = 0x06;
547 } else {
548 if (par->mode & MODE_CFB)
549 gdc[VGA_GFX_MODE] = 0x40;
550 else
551 gdc[VGA_GFX_MODE] = 0x00;
552 gdc[VGA_GFX_MISC] = 0x05;
553 }
554 gdc[VGA_GFX_COMPARE_MASK] = 0x0F;
555 gdc[VGA_GFX_BIT_MASK] = 0xFF;
556
557 for (i = 0x00; i < 0x10; i++)
558 atc[i] = i;
559 if (par->mode & MODE_TEXT)
560 atc[VGA_ATC_MODE] = 0x04;
561 else if (par->mode & MODE_8BPP)
562 atc[VGA_ATC_MODE] = 0x41;
563 else
564 atc[VGA_ATC_MODE] = 0x81;
565 atc[VGA_ATC_OVERSCAN] = 0x00; /* 0 for EGA, 0xFF for VGA */
566 atc[VGA_ATC_PLANE_ENABLE] = 0x0F;
567 if (par->mode & MODE_8BPP)
568 atc[VGA_ATC_PEL] = (info->var.xoffset & 3) << 1;
569 else
570 atc[VGA_ATC_PEL] = info->var.xoffset & 7;
571 atc[VGA_ATC_COLOR_PAGE] = 0x00;
572
573 if (par->mode & MODE_TEXT) {
574 fh = 16; // FIXME !!! Fudge font height.
575 par->crtc[VGA_CRTC_MAX_SCAN] = (par->crtc[VGA_CRTC_MAX_SCAN]
576 & ~0x1F) | (fh - 1);
577 }
578
579 vga_io_w(VGA_MIS_W, vga_io_r(VGA_MIS_R) | 0x01);
580
581 /* Enable graphics register modification */
582 if (!par->isVGA) {
583 vga_io_w(EGA_GFX_E0, 0x00);
584 vga_io_w(EGA_GFX_E1, 0x01);
585 }
586
587 /* update misc output register */
588 vga_io_w(VGA_MIS_W, par->misc);
589
590 /* synchronous reset on */
591 vga_io_wseq(0x00, 0x01);
592
593 if (par->isVGA)
594 vga_io_w(VGA_PEL_MSK, par->pel_msk);
595
596 /* write sequencer registers */
597 vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE] | 0x20);
598 for (i = 2; i < VGA_SEQ_C; i++) {
599 vga_io_wseq(i, seq[i]);
600 }
601
602 /* synchronous reset off */
603 vga_io_wseq(0x00, 0x03);
604
605 /* deprotect CRT registers 0-7 */
606 vga_io_wcrt(VGA_CRTC_V_SYNC_END, par->crtc[VGA_CRTC_V_SYNC_END]);
607
608 /* write CRT registers */
609 for (i = 0; i < VGA_CRTC_REGS; i++) {
610 vga_io_wcrt(i, par->crtc[i]);
611 }
612
613 /* write graphics controller registers */
614 for (i = 0; i < VGA_GFX_C; i++) {
615 vga_io_wgfx(i, gdc[i]);
616 }
617
618 /* write attribute controller registers */
619 for (i = 0; i < VGA_ATT_C; i++) {
620 vga_io_r(VGA_IS1_RC); /* reset flip-flop */
621 vga_io_wattr(i, atc[i]);
622 }
623
624 /* Wait for screen to stabilize. */
625 mdelay(50);
626
627 vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE]);
628
629 vga_io_r(VGA_IS1_RC);
630 vga_io_w(VGA_ATT_IW, 0x20);
631
632 vga16fb_update_fix(info);
633 return 0;
634 }
635
636 static void ega16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
637 {
638 static const unsigned char map[] = { 000, 001, 010, 011 };
639 int val;
640
641 if (regno >= 16)
642 return;
643 val = map[red>>14] | ((map[green>>14]) << 1) | ((map[blue>>14]) << 2);
644 vga_io_r(VGA_IS1_RC); /* ! 0x3BA */
645 vga_io_wattr(regno, val);
646 vga_io_r(VGA_IS1_RC); /* some clones need it */
647 vga_io_w(VGA_ATT_IW, 0x20); /* unblank screen */
648 }
649
650 static void vga16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
651 {
652 outb(regno, VGA_PEL_IW);
653 outb(red >> 10, VGA_PEL_D);
654 outb(green >> 10, VGA_PEL_D);
655 outb(blue >> 10, VGA_PEL_D);
656 }
657
658 static int vga16fb_setcolreg(unsigned regno, unsigned red, unsigned green,
659 unsigned blue, unsigned transp,
660 struct fb_info *info)
661 {
662 struct vga16fb_par *par = info->par;
663 int gray;
664
665 /*
666 * Set a single color register. The values supplied are
667 * already rounded down to the hardware's capabilities
668 * (according to the entries in the `var' structure). Return
669 * != 0 for invalid regno.
670 */
671
672 if (regno >= 256)
673 return 1;
674
675 gray = info->var.grayscale;
676
677 if (gray) {
678 /* gray = 0.30*R + 0.59*G + 0.11*B */
679 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
680 }
681 if (par->isVGA)
682 vga16_setpalette(regno,red,green,blue);
683 else
684 ega16_setpalette(regno,red,green,blue);
685 return 0;
686 }
687
688 static int vga16fb_pan_display(struct fb_var_screeninfo *var,
689 struct fb_info *info)
690 {
691 vga16fb_pan_var(info, var);
692 return 0;
693 }
694
695 /* The following VESA blanking code is taken from vgacon.c. The VGA
696 blanking code was originally by Huang shi chao, and modified by
697 Christoph Rimek (chrimek@toppoint.de) and todd j. derr
698 (tjd@barefoot.org) for Linux. */
699
700 static void vga_vesa_blank(struct vga16fb_par *par, int mode)
701 {
702 unsigned char SeqCtrlIndex = vga_io_r(VGA_SEQ_I);
703 unsigned char CrtCtrlIndex = vga_io_r(VGA_CRT_IC);
704
705 /* save original values of VGA controller registers */
706 if(!par->vesa_blanked) {
707 par->vga_state.CrtMiscIO = vga_io_r(VGA_MIS_R);
708 //sti();
709
710 par->vga_state.HorizontalTotal = vga_io_rcrt(0x00); /* HorizontalTotal */
711 par->vga_state.HorizDisplayEnd = vga_io_rcrt(0x01); /* HorizDisplayEnd */
712 par->vga_state.StartHorizRetrace = vga_io_rcrt(0x04); /* StartHorizRetrace */
713 par->vga_state.EndHorizRetrace = vga_io_rcrt(0x05); /* EndHorizRetrace */
714 par->vga_state.Overflow = vga_io_rcrt(0x07); /* Overflow */
715 par->vga_state.StartVertRetrace = vga_io_rcrt(0x10); /* StartVertRetrace */
716 par->vga_state.EndVertRetrace = vga_io_rcrt(0x11); /* EndVertRetrace */
717 par->vga_state.ModeControl = vga_io_rcrt(0x17); /* ModeControl */
718 par->vga_state.ClockingMode = vga_io_rseq(0x01); /* ClockingMode */
719 }
720
721 /* assure that video is enabled */
722 /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
723 vga_io_wseq(0x01, par->vga_state.ClockingMode | 0x20);
724
725 /* test for vertical retrace in process.... */
726 if ((par->vga_state.CrtMiscIO & 0x80) == 0x80)
727 vga_io_w(VGA_MIS_W, par->vga_state.CrtMiscIO & 0xef);
728
729 /*
730 * Set <End of vertical retrace> to minimum (0) and
731 * <Start of vertical Retrace> to maximum (incl. overflow)
732 * Result: turn off vertical sync (VSync) pulse.
733 */
734 if (mode & FB_BLANK_VSYNC_SUSPEND) {
735 vga_io_wcrt(VGA_CRTC_V_SYNC_START, 0xff);
736 vga_io_wcrt(VGA_CRTC_V_SYNC_END, 0x40);
737 /* bits 9,10 of vert. retrace */
738 vga_io_wcrt(VGA_CRTC_OVERFLOW, par->vga_state.Overflow | 0x84);
739 }
740
741 if (mode & FB_BLANK_HSYNC_SUSPEND) {
742 /*
743 * Set <End of horizontal retrace> to minimum (0) and
744 * <Start of horizontal Retrace> to maximum
745 * Result: turn off horizontal sync (HSync) pulse.
746 */
747 vga_io_wcrt(VGA_CRTC_H_SYNC_START, 0xff);
748 vga_io_wcrt(VGA_CRTC_H_SYNC_END, 0x00);
749 }
750
751 /* restore both index registers */
752 outb_p(SeqCtrlIndex, VGA_SEQ_I);
753 outb_p(CrtCtrlIndex, VGA_CRT_IC);
754 }
755
756 static void vga_vesa_unblank(struct vga16fb_par *par)
757 {
758 unsigned char SeqCtrlIndex = vga_io_r(VGA_SEQ_I);
759 unsigned char CrtCtrlIndex = vga_io_r(VGA_CRT_IC);
760
761 /* restore original values of VGA controller registers */
762 vga_io_w(VGA_MIS_W, par->vga_state.CrtMiscIO);
763
764 /* HorizontalTotal */
765 vga_io_wcrt(0x00, par->vga_state.HorizontalTotal);
766 /* HorizDisplayEnd */
767 vga_io_wcrt(0x01, par->vga_state.HorizDisplayEnd);
768 /* StartHorizRetrace */
769 vga_io_wcrt(0x04, par->vga_state.StartHorizRetrace);
770 /* EndHorizRetrace */
771 vga_io_wcrt(0x05, par->vga_state.EndHorizRetrace);
772 /* Overflow */
773 vga_io_wcrt(0x07, par->vga_state.Overflow);
774 /* StartVertRetrace */
775 vga_io_wcrt(0x10, par->vga_state.StartVertRetrace);
776 /* EndVertRetrace */
777 vga_io_wcrt(0x11, par->vga_state.EndVertRetrace);
778 /* ModeControl */
779 vga_io_wcrt(0x17, par->vga_state.ModeControl);
780 /* ClockingMode */
781 vga_io_wseq(0x01, par->vga_state.ClockingMode);
782
783 /* restore index/control registers */
784 vga_io_w(VGA_SEQ_I, SeqCtrlIndex);
785 vga_io_w(VGA_CRT_IC, CrtCtrlIndex);
786 }
787
788 static void vga_pal_blank(void)
789 {
790 int i;
791
792 for (i=0; i<16; i++) {
793 outb_p(i, VGA_PEL_IW);
794 outb_p(0, VGA_PEL_D);
795 outb_p(0, VGA_PEL_D);
796 outb_p(0, VGA_PEL_D);
797 }
798 }
799
800 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
801 static int vga16fb_blank(int blank, struct fb_info *info)
802 {
803 struct vga16fb_par *par = info->par;
804
805 switch (blank) {
806 case FB_BLANK_UNBLANK: /* Unblank */
807 if (par->vesa_blanked) {
808 vga_vesa_unblank(par);
809 par->vesa_blanked = 0;
810 }
811 if (par->palette_blanked) {
812 par->palette_blanked = 0;
813 }
814 break;
815 case FB_BLANK_NORMAL: /* blank */
816 vga_pal_blank();
817 par->palette_blanked = 1;
818 break;
819 default: /* VESA blanking */
820 vga_vesa_blank(par, blank);
821 par->vesa_blanked = 1;
822 break;
823 }
824 return 0;
825 }
826
827 static void vga_8planes_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
828 {
829 u32 dx = rect->dx, width = rect->width;
830 char oldindex = getindex();
831 char oldmode = setmode(0x40);
832 char oldmask = selectmask();
833 int line_ofs, height;
834 char oldop, oldsr;
835 char __iomem *where;
836
837 dx /= 4;
838 where = info->screen_base + dx + rect->dy * info->fix.line_length;
839
840 if (rect->rop == ROP_COPY) {
841 oldop = setop(0);
842 oldsr = setsr(0);
843
844 width /= 4;
845 line_ofs = info->fix.line_length - width;
846 setmask(0xff);
847
848 height = rect->height;
849
850 while (height--) {
851 int x;
852
853 /* we can do memset... */
854 for (x = width; x > 0; --x) {
855 writeb(rect->color, where);
856 where++;
857 }
858 where += line_ofs;
859 }
860 } else {
861 char oldcolor = setcolor(0xf);
862 int y;
863
864 oldop = setop(0x18);
865 oldsr = setsr(0xf);
866 setmask(0x0F);
867 for (y = 0; y < rect->height; y++) {
868 rmw(where);
869 rmw(where+1);
870 where += info->fix.line_length;
871 }
872 setcolor(oldcolor);
873 }
874 setmask(oldmask);
875 setsr(oldsr);
876 setop(oldop);
877 setmode(oldmode);
878 setindex(oldindex);
879 }
880
881 static void vga16fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
882 {
883 int x, x2, y2, vxres, vyres, width, height, line_ofs;
884 char __iomem *dst;
885
886 vxres = info->var.xres_virtual;
887 vyres = info->var.yres_virtual;
888
889 if (!rect->width || !rect->height || rect->dx > vxres || rect->dy > vyres)
890 return;
891
892 /* We could use hardware clipping but on many cards you get around
893 * hardware clipping by writing to framebuffer directly. */
894
895 x2 = rect->dx + rect->width;
896 y2 = rect->dy + rect->height;
897 x2 = x2 < vxres ? x2 : vxres;
898 y2 = y2 < vyres ? y2 : vyres;
899 width = x2 - rect->dx;
900
901 switch (info->fix.type) {
902 case FB_TYPE_VGA_PLANES:
903 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
904
905 height = y2 - rect->dy;
906 width = rect->width/8;
907
908 line_ofs = info->fix.line_length - width;
909 dst = info->screen_base + (rect->dx/8) + rect->dy * info->fix.line_length;
910
911 switch (rect->rop) {
912 case ROP_COPY:
913 setmode(0);
914 setop(0);
915 setsr(0xf);
916 setcolor(rect->color);
917 selectmask();
918
919 setmask(0xff);
920
921 while (height--) {
922 for (x = 0; x < width; x++) {
923 writeb(0, dst);
924 dst++;
925 }
926 dst += line_ofs;
927 }
928 break;
929 case ROP_XOR:
930 setmode(0);
931 setop(0x18);
932 setsr(0xf);
933 setcolor(0xf);
934 selectmask();
935
936 setmask(0xff);
937 while (height--) {
938 for (x = 0; x < width; x++) {
939 rmw(dst);
940 dst++;
941 }
942 dst += line_ofs;
943 }
944 break;
945 }
946 } else
947 vga_8planes_fillrect(info, rect);
948 break;
949 case FB_TYPE_PACKED_PIXELS:
950 default:
951 cfb_fillrect(info, rect);
952 break;
953 }
954 }
955
956 static void vga_8planes_copyarea(struct fb_info *info, const struct fb_copyarea *area)
957 {
958 char oldindex = getindex();
959 char oldmode = setmode(0x41);
960 char oldop = setop(0);
961 char oldsr = setsr(0xf);
962 int height, line_ofs, x;
963 u32 sx, dx, width;
964 char __iomem *dest;
965 char __iomem *src;
966
967 height = area->height;
968
969 sx = area->sx / 4;
970 dx = area->dx / 4;
971 width = area->width / 4;
972
973 if (area->dy < area->sy || (area->dy == area->sy && dx < sx)) {
974 line_ofs = info->fix.line_length - width;
975 dest = info->screen_base + dx + area->dy * info->fix.line_length;
976 src = info->screen_base + sx + area->sy * info->fix.line_length;
977 while (height--) {
978 for (x = 0; x < width; x++) {
979 readb(src);
980 writeb(0, dest);
981 src++;
982 dest++;
983 }
984 src += line_ofs;
985 dest += line_ofs;
986 }
987 } else {
988 line_ofs = info->fix.line_length - width;
989 dest = info->screen_base + dx + width +
990 (area->dy + height - 1) * info->fix.line_length;
991 src = info->screen_base + sx + width +
992 (area->sy + height - 1) * info->fix.line_length;
993 while (height--) {
994 for (x = 0; x < width; x++) {
995 --src;
996 --dest;
997 readb(src);
998 writeb(0, dest);
999 }
1000 src -= line_ofs;
1001 dest -= line_ofs;
1002 }
1003 }
1004
1005 setsr(oldsr);
1006 setop(oldop);
1007 setmode(oldmode);
1008 setindex(oldindex);
1009 }
1010
1011 static void vga16fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
1012 {
1013 u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
1014 int x, x2, y2, old_dx, old_dy, vxres, vyres;
1015 int height, width, line_ofs;
1016 char __iomem *dst = NULL;
1017 char __iomem *src = NULL;
1018
1019 vxres = info->var.xres_virtual;
1020 vyres = info->var.yres_virtual;
1021
1022 if (area->dx > vxres || area->sx > vxres || area->dy > vyres ||
1023 area->sy > vyres)
1024 return;
1025
1026 /* clip the destination */
1027 old_dx = area->dx;
1028 old_dy = area->dy;
1029
1030 /*
1031 * We could use hardware clipping but on many cards you get around
1032 * hardware clipping by writing to framebuffer directly.
1033 */
1034 x2 = area->dx + area->width;
1035 y2 = area->dy + area->height;
1036 dx = area->dx > 0 ? area->dx : 0;
1037 dy = area->dy > 0 ? area->dy : 0;
1038 x2 = x2 < vxres ? x2 : vxres;
1039 y2 = y2 < vyres ? y2 : vyres;
1040 width = x2 - dx;
1041 height = y2 - dy;
1042
1043 if (sx + dx < old_dx || sy + dy < old_dy)
1044 return;
1045
1046 /* update sx1,sy1 */
1047 sx += (dx - old_dx);
1048 sy += (dy - old_dy);
1049
1050 /* the source must be completely inside the virtual screen */
1051 if (sx + width > vxres || sy + height > vyres)
1052 return;
1053
1054 switch (info->fix.type) {
1055 case FB_TYPE_VGA_PLANES:
1056 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
1057 width = width/8;
1058 height = height;
1059 line_ofs = info->fix.line_length - width;
1060
1061 setmode(1);
1062 setop(0);
1063 setsr(0xf);
1064
1065 if (dy < sy || (dy == sy && dx < sx)) {
1066 dst = info->screen_base + (dx/8) + dy * info->fix.line_length;
1067 src = info->screen_base + (sx/8) + sy * info->fix.line_length;
1068 while (height--) {
1069 for (x = 0; x < width; x++) {
1070 readb(src);
1071 writeb(0, dst);
1072 dst++;
1073 src++;
1074 }
1075 src += line_ofs;
1076 dst += line_ofs;
1077 }
1078 } else {
1079 dst = info->screen_base + (dx/8) + width +
1080 (dy + height - 1) * info->fix.line_length;
1081 src = info->screen_base + (sx/8) + width +
1082 (sy + height - 1) * info->fix.line_length;
1083 while (height--) {
1084 for (x = 0; x < width; x++) {
1085 dst--;
1086 src--;
1087 readb(src);
1088 writeb(0, dst);
1089 }
1090 src -= line_ofs;
1091 dst -= line_ofs;
1092 }
1093 }
1094 } else
1095 vga_8planes_copyarea(info, area);
1096 break;
1097 case FB_TYPE_PACKED_PIXELS:
1098 default:
1099 cfb_copyarea(info, area);
1100 break;
1101 }
1102 }
1103
1104 #define TRANS_MASK_LOW {0x0,0x8,0x4,0xC,0x2,0xA,0x6,0xE,0x1,0x9,0x5,0xD,0x3,0xB,0x7,0xF}
1105 #define TRANS_MASK_HIGH {0x000, 0x800, 0x400, 0xC00, 0x200, 0xA00, 0x600, 0xE00, \
1106 0x100, 0x900, 0x500, 0xD00, 0x300, 0xB00, 0x700, 0xF00}
1107
1108 #if defined(__LITTLE_ENDIAN)
1109 static const u16 transl_l[] = TRANS_MASK_LOW;
1110 static const u16 transl_h[] = TRANS_MASK_HIGH;
1111 #elif defined(__BIG_ENDIAN)
1112 static const u16 transl_l[] = TRANS_MASK_HIGH;
1113 static const u16 transl_h[] = TRANS_MASK_LOW;
1114 #else
1115 #error "Only __BIG_ENDIAN and __LITTLE_ENDIAN are supported in vga-planes"
1116 #endif
1117
1118 static void vga_8planes_imageblit(struct fb_info *info, const struct fb_image *image)
1119 {
1120 char oldindex = getindex();
1121 char oldmode = setmode(0x40);
1122 char oldop = setop(0);
1123 char oldsr = setsr(0);
1124 char oldmask = selectmask();
1125 const unsigned char *cdat = image->data;
1126 u32 dx = image->dx;
1127 char __iomem *where;
1128 int y;
1129
1130 dx /= 4;
1131 where = info->screen_base + dx + image->dy * info->fix.line_length;
1132
1133 setmask(0xff);
1134 writeb(image->bg_color, where);
1135 readb(where);
1136 selectmask();
1137 setmask(image->fg_color ^ image->bg_color);
1138 setmode(0x42);
1139 setop(0x18);
1140 for (y = 0; y < image->height; y++, where += info->fix.line_length)
1141 writew(transl_h[cdat[y]&0xF] | transl_l[cdat[y] >> 4], where);
1142 setmask(oldmask);
1143 setsr(oldsr);
1144 setop(oldop);
1145 setmode(oldmode);
1146 setindex(oldindex);
1147 }
1148
1149 static void vga_imageblit_expand(struct fb_info *info, const struct fb_image *image)
1150 {
1151 char __iomem *where = info->screen_base + (image->dx/8) +
1152 image->dy * info->fix.line_length;
1153 struct vga16fb_par *par = info->par;
1154 char *cdat = (char *) image->data;
1155 char __iomem *dst;
1156 int x, y;
1157
1158 switch (info->fix.type) {
1159 case FB_TYPE_VGA_PLANES:
1160 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
1161 if (par->isVGA) {
1162 setmode(2);
1163 setop(0);
1164 setsr(0xf);
1165 setcolor(image->fg_color);
1166 selectmask();
1167
1168 setmask(0xff);
1169 writeb(image->bg_color, where);
1170 rmb();
1171 readb(where); /* fill latches */
1172 setmode(3);
1173 wmb();
1174 for (y = 0; y < image->height; y++) {
1175 dst = where;
1176 for (x = image->width/8; x--;)
1177 writeb(*cdat++, dst++);
1178 where += info->fix.line_length;
1179 }
1180 wmb();
1181 } else {
1182 setmode(0);
1183 setop(0);
1184 setsr(0xf);
1185 setcolor(image->bg_color);
1186 selectmask();
1187
1188 setmask(0xff);
1189 for (y = 0; y < image->height; y++) {
1190 dst = where;
1191 for (x=image->width/8; x--;){
1192 rmw(dst);
1193 setcolor(image->fg_color);
1194 selectmask();
1195 if (*cdat) {
1196 setmask(*cdat++);
1197 rmw(dst++);
1198 }
1199 }
1200 where += info->fix.line_length;
1201 }
1202 }
1203 } else
1204 vga_8planes_imageblit(info, image);
1205 break;
1206 case FB_TYPE_PACKED_PIXELS:
1207 default:
1208 cfb_imageblit(info, image);
1209 break;
1210 }
1211 }
1212
1213 static void vga_imageblit_color(struct fb_info *info, const struct fb_image *image)
1214 {
1215 /*
1216 * Draw logo
1217 */
1218 struct vga16fb_par *par = info->par;
1219 char __iomem *where =
1220 info->screen_base + image->dy * info->fix.line_length +
1221 image->dx/8;
1222 const char *cdat = image->data;
1223 char __iomem *dst;
1224 int x, y;
1225
1226 switch (info->fix.type) {
1227 case FB_TYPE_VGA_PLANES:
1228 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4 &&
1229 par->isVGA) {
1230 setsr(0xf);
1231 setop(0);
1232 setmode(0);
1233
1234 for (y = 0; y < image->height; y++) {
1235 for (x = 0; x < image->width; x++) {
1236 dst = where + x/8;
1237
1238 setcolor(*cdat);
1239 selectmask();
1240 setmask(1 << (7 - (x % 8)));
1241 fb_readb(dst);
1242 fb_writeb(0, dst);
1243
1244 cdat++;
1245 }
1246 where += info->fix.line_length;
1247 }
1248 }
1249 break;
1250 case FB_TYPE_PACKED_PIXELS:
1251 cfb_imageblit(info, image);
1252 break;
1253 default:
1254 break;
1255 }
1256 }
1257
1258 static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image)
1259 {
1260 if (image->depth == 1)
1261 vga_imageblit_expand(info, image);
1262 else
1263 vga_imageblit_color(info, image);
1264 }
1265
1266 static void vga16fb_destroy(struct fb_info *info)
1267 {
1268 iounmap(info->screen_base);
1269 fb_dealloc_cmap(&info->cmap);
1270 /* XXX unshare VGA regions */
1271 framebuffer_release(info);
1272 }
1273
1274 static struct fb_ops vga16fb_ops = {
1275 .owner = THIS_MODULE,
1276 .fb_open = vga16fb_open,
1277 .fb_release = vga16fb_release,
1278 .fb_destroy = vga16fb_destroy,
1279 .fb_check_var = vga16fb_check_var,
1280 .fb_set_par = vga16fb_set_par,
1281 .fb_setcolreg = vga16fb_setcolreg,
1282 .fb_pan_display = vga16fb_pan_display,
1283 .fb_blank = vga16fb_blank,
1284 .fb_fillrect = vga16fb_fillrect,
1285 .fb_copyarea = vga16fb_copyarea,
1286 .fb_imageblit = vga16fb_imageblit,
1287 };
1288
1289 #ifndef MODULE
1290 static int __init vga16fb_setup(char *options)
1291 {
1292 char *this_opt;
1293
1294 if (!options || !*options)
1295 return 0;
1296
1297 while ((this_opt = strsep(&options, ",")) != NULL) {
1298 if (!*this_opt) continue;
1299 }
1300 return 0;
1301 }
1302 #endif
1303
1304 static int vga16fb_probe(struct platform_device *dev)
1305 {
1306 struct fb_info *info;
1307 struct vga16fb_par *par;
1308 int i;
1309 int ret = 0;
1310
1311 printk(KERN_DEBUG "vga16fb: initializing\n");
1312 info = framebuffer_alloc(sizeof(struct vga16fb_par), &dev->dev);
1313
1314 if (!info) {
1315 ret = -ENOMEM;
1316 goto err_fb_alloc;
1317 }
1318 info->apertures = alloc_apertures(1);
1319 if (!info->apertures) {
1320 ret = -ENOMEM;
1321 goto err_ioremap;
1322 }
1323
1324 /* XXX share VGA_FB_PHYS and I/O region with vgacon and others */
1325 info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS, 0);
1326
1327 if (!info->screen_base) {
1328 printk(KERN_ERR "vga16fb: unable to map device\n");
1329 ret = -ENOMEM;
1330 goto err_ioremap;
1331 }
1332
1333 printk(KERN_INFO "vga16fb: mapped to 0x%p\n", info->screen_base);
1334 par = info->par;
1335
1336 par->isVGA = screen_info.orig_video_isVGA;
1337 par->palette_blanked = 0;
1338 par->vesa_blanked = 0;
1339
1340 i = par->isVGA? 6 : 2;
1341
1342 vga16fb_defined.red.length = i;
1343 vga16fb_defined.green.length = i;
1344 vga16fb_defined.blue.length = i;
1345
1346 /* name should not depend on EGA/VGA */
1347 info->fbops = &vga16fb_ops;
1348 info->var = vga16fb_defined;
1349 info->fix = vga16fb_fix;
1350 /* supports rectangles with widths of multiples of 8 */
1351 info->pixmap.blit_x = 1 << 7 | 1 << 15 | 1 << 23 | 1 << 31;
1352 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
1353 FBINFO_HWACCEL_YPAN;
1354
1355 i = (info->var.bits_per_pixel == 8) ? 256 : 16;
1356 ret = fb_alloc_cmap(&info->cmap, i, 0);
1357 if (ret) {
1358 printk(KERN_ERR "vga16fb: unable to allocate colormap\n");
1359 ret = -ENOMEM;
1360 goto err_alloc_cmap;
1361 }
1362
1363 if (vga16fb_check_var(&info->var, info)) {
1364 printk(KERN_ERR "vga16fb: unable to validate variable\n");
1365 ret = -EINVAL;
1366 goto err_check_var;
1367 }
1368
1369 vga16fb_update_fix(info);
1370
1371 info->apertures->ranges[0].base = VGA_FB_PHYS;
1372 info->apertures->ranges[0].size = VGA_FB_PHYS_LEN;
1373
1374 if (register_framebuffer(info) < 0) {
1375 printk(KERN_ERR "vga16fb: unable to register framebuffer\n");
1376 ret = -EINVAL;
1377 goto err_check_var;
1378 }
1379
1380 fb_info(info, "%s frame buffer device\n", info->fix.id);
1381 platform_set_drvdata(dev, info);
1382
1383 return 0;
1384
1385 err_check_var:
1386 fb_dealloc_cmap(&info->cmap);
1387 err_alloc_cmap:
1388 iounmap(info->screen_base);
1389 err_ioremap:
1390 framebuffer_release(info);
1391 err_fb_alloc:
1392 return ret;
1393 }
1394
1395 static int vga16fb_remove(struct platform_device *dev)
1396 {
1397 struct fb_info *info = platform_get_drvdata(dev);
1398
1399 if (info)
1400 unregister_framebuffer(info);
1401
1402 return 0;
1403 }
1404
1405 static struct platform_driver vga16fb_driver = {
1406 .probe = vga16fb_probe,
1407 .remove = vga16fb_remove,
1408 .driver = {
1409 .name = "vga16fb",
1410 },
1411 };
1412
1413 static struct platform_device *vga16fb_device;
1414
1415 static int __init vga16fb_init(void)
1416 {
1417 int ret;
1418 #ifndef MODULE
1419 char *option = NULL;
1420
1421 if (fb_get_options("vga16fb", &option))
1422 return -ENODEV;
1423
1424 vga16fb_setup(option);
1425 #endif
1426 ret = platform_driver_register(&vga16fb_driver);
1427
1428 if (!ret) {
1429 vga16fb_device = platform_device_alloc("vga16fb", 0);
1430
1431 if (vga16fb_device)
1432 ret = platform_device_add(vga16fb_device);
1433 else
1434 ret = -ENOMEM;
1435
1436 if (ret) {
1437 platform_device_put(vga16fb_device);
1438 platform_driver_unregister(&vga16fb_driver);
1439 }
1440 }
1441
1442 return ret;
1443 }
1444
1445 static void __exit vga16fb_exit(void)
1446 {
1447 platform_device_unregister(vga16fb_device);
1448 platform_driver_unregister(&vga16fb_driver);
1449 }
1450
1451 MODULE_DESCRIPTION("Legacy VGA framebuffer device driver");
1452 MODULE_LICENSE("GPL");
1453 module_init(vga16fb_init);
1454 module_exit(vga16fb_exit);
1455
1456
1457 /*
1458 * Overrides for Emacs so that we follow Linus's tabbing style.
1459 * ---------------------------------------------------------------------------
1460 * Local variables:
1461 * c-basic-offset: 8
1462 * End:
1463 */
1464
Arne's tree of linux kernel.