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[PATCH] g_file_storage: fix obscure race condition
[linux/fpc-iii.git] / drivers / video / vga16fb.c
blobb46454c55c91b01767753d356c2963e9ca6b080d
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/tty.h>
19 #include <linux/slab.h>
20 #include <linux/delay.h>
21 #include <linux/fb.h>
22 #include <linux/ioport.h>
23 #include <linux/init.h>
24
25 #include <asm/io.h>
26 #include <video/vga.h>
27
28 #define GRAPHICS_ADDR_REG VGA_GFX_I /* Graphics address register. */
29 #define GRAPHICS_DATA_REG VGA_GFX_D /* Graphics data register. */
30
31 #define SET_RESET_INDEX VGA_GFX_SR_VALUE /* Set/Reset Register index. */
32 #define ENABLE_SET_RESET_INDEX VGA_GFX_SR_ENABLE /* Enable Set/Reset Register index. */
33 #define DATA_ROTATE_INDEX VGA_GFX_DATA_ROTATE /* Data Rotate Register index. */
34 #define GRAPHICS_MODE_INDEX VGA_GFX_MODE /* Graphics Mode Register index. */
35 #define BIT_MASK_INDEX VGA_GFX_BIT_MASK /* Bit Mask Register index. */
36
37 #define dac_reg (VGA_PEL_IW)
38 #define dac_val (VGA_PEL_D)
39
40 #define VGA_FB_PHYS 0xA0000
41 #define VGA_FB_PHYS_LEN 65536
42
43 #define MODE_SKIP4 1
44 #define MODE_8BPP 2
45 #define MODE_CFB 4
46 #define MODE_TEXT 8
47
48 /* --------------------------------------------------------------------- */
49
50 /*
51 * card parameters
52 */
53
54 static struct fb_info vga16fb;
55
56 static struct vga16fb_par {
57 /* structure holding original VGA register settings when the
58 screen is blanked */
59 struct {
60 unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
61 unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
62 unsigned char CrtMiscIO; /* Miscellaneous register */
63 unsigned char HorizontalTotal; /* CRT-Controller:00h */
64 unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
65 unsigned char StartHorizRetrace; /* CRT-Controller:04h */
66 unsigned char EndHorizRetrace; /* CRT-Controller:05h */
67 unsigned char Overflow; /* CRT-Controller:07h */
68 unsigned char StartVertRetrace; /* CRT-Controller:10h */
69 unsigned char EndVertRetrace; /* CRT-Controller:11h */
70 unsigned char ModeControl; /* CRT-Controller:17h */
71 unsigned char ClockingMode; /* Seq-Controller:01h */
72 } vga_state;
73 struct vgastate state;
74 atomic_t ref_count;
75 int palette_blanked, vesa_blanked, mode, isVGA;
76 u8 misc, pel_msk, vss, clkdiv;
77 u8 crtc[VGA_CRT_C];
78 } vga16_par;
79
80 /* --------------------------------------------------------------------- */
81
82 static struct fb_var_screeninfo vga16fb_defined = {
83 .xres = 640,
84 .yres = 480,
85 .xres_virtual = 640,
86 .yres_virtual = 480,
87 .bits_per_pixel = 4,
88 .activate = FB_ACTIVATE_TEST,
89 .height = -1,
90 .width = -1,
91 .pixclock = 39721,
92 .left_margin = 48,
93 .right_margin = 16,
94 .upper_margin = 33,
95 .lower_margin = 10,
96 .hsync_len = 96,
97 .vsync_len = 2,
98 .vmode = FB_VMODE_NONINTERLACED,
99 };
100
101 /* name should not depend on EGA/VGA */
102 static struct fb_fix_screeninfo vga16fb_fix __initdata = {
103 .id = "VGA16 VGA",
104 .smem_start = VGA_FB_PHYS,
105 .smem_len = VGA_FB_PHYS_LEN,
106 .type = FB_TYPE_VGA_PLANES,
107 .type_aux = FB_AUX_VGA_PLANES_VGA4,
108 .visual = FB_VISUAL_PSEUDOCOLOR,
109 .xpanstep = 8,
110 .ypanstep = 1,
111 .line_length = 640/8,
112 .accel = FB_ACCEL_NONE
113 };
114
115 /* The VGA's weird architecture often requires that we read a byte and
116 write a byte to the same location. It doesn't matter *what* byte
117 we write, however. This is because all the action goes on behind
118 the scenes in the VGA's 32-bit latch register, and reading and writing
119 video memory just invokes latch behavior.
120
121 To avoid race conditions (is this necessary?), reading and writing
122 the memory byte should be done with a single instruction. One
123 suitable instruction is the x86 bitwise OR. The following
124 read-modify-write routine should optimize to one such bitwise
125 OR. */
126 static inline void rmw(volatile char __iomem *p)
127 {
128 readb(p);
129 writeb(1, p);
130 }
131
132 /* Set the Graphics Mode Register, and return its previous value.
133 Bits 0-1 are write mode, bit 3 is read mode. */
134 static inline int setmode(int mode)
135 {
136 int oldmode;
137
138 vga_io_w(GRAPHICS_ADDR_REG, GRAPHICS_MODE_INDEX);
139 oldmode = vga_io_r(GRAPHICS_DATA_REG);
140 vga_io_w(GRAPHICS_DATA_REG, mode);
141 return oldmode;
142 }
143
144 /* Select the Bit Mask Register and return its value. */
145 static inline int selectmask(void)
146 {
147 return vga_io_rgfx(BIT_MASK_INDEX);
148 }
149
150 /* Set the value of the Bit Mask Register. It must already have been
151 selected with selectmask(). */
152 static inline void setmask(int mask)
153 {
154 vga_io_w(GRAPHICS_DATA_REG, mask);
155 }
156
157 /* Set the Data Rotate Register and return its old value.
158 Bits 0-2 are rotate count, bits 3-4 are logical operation
159 (0=NOP, 1=AND, 2=OR, 3=XOR). */
160 static inline int setop(int op)
161 {
162 int oldop;
163
164 vga_io_w(GRAPHICS_ADDR_REG, DATA_ROTATE_INDEX);
165 oldop = vga_io_r(GRAPHICS_DATA_REG);
166 vga_io_w(GRAPHICS_DATA_REG, op);
167 return oldop;
168 }
169
170 /* Set the Enable Set/Reset Register and return its old value.
171 The code here always uses value 0xf for thsi register. */
172 static inline int setsr(int sr)
173 {
174 int oldsr;
175
176 vga_io_w(GRAPHICS_ADDR_REG, ENABLE_SET_RESET_INDEX);
177 oldsr = vga_io_r(GRAPHICS_DATA_REG);
178 vga_io_w(GRAPHICS_DATA_REG, sr);
179 return oldsr;
180 }
181
182 /* Set the Set/Reset Register and return its old value. */
183 static inline int setcolor(int color)
184 {
185 int oldcolor;
186
187 vga_io_w(GRAPHICS_ADDR_REG, SET_RESET_INDEX);
188 oldcolor = vga_io_r(GRAPHICS_DATA_REG);
189 vga_io_w(GRAPHICS_DATA_REG, color);
190 return oldcolor;
191 }
192
193 /* Return the value in the Graphics Address Register. */
194 static inline int getindex(void)
195 {
196 return vga_io_r(GRAPHICS_ADDR_REG);
197 }
198
199 /* Set the value in the Graphics Address Register. */
200 static inline void setindex(int index)
201 {
202 vga_io_w(GRAPHICS_ADDR_REG, index);
203 }
204
205 static void vga16fb_pan_var(struct fb_info *info,
206 struct fb_var_screeninfo *var)
207 {
208 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
209 u32 xoffset, pos;
210
211 xoffset = var->xoffset;
212 if (info->var.bits_per_pixel == 8) {
213 pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 2;
214 } else if (par->mode & MODE_TEXT) {
215 int fh = 16; // FIXME !!! font height. Fugde for now.
216 pos = (info->var.xres_virtual * (var->yoffset / fh) + xoffset) >> 3;
217 } else {
218 if (info->var.nonstd)
219 xoffset--;
220 pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 3;
221 }
222 vga_io_wcrt(VGA_CRTC_START_HI, pos >> 8);
223 vga_io_wcrt(VGA_CRTC_START_LO, pos & 0xFF);
224 /* if we support CFB4, then we must! support xoffset with pixel
225 * granularity if someone supports xoffset in bit resolution */
226 vga_io_r(VGA_IS1_RC); /* reset flip-flop */
227 vga_io_w(VGA_ATT_IW, VGA_ATC_PEL);
228 if (var->bits_per_pixel == 8)
229 vga_io_w(VGA_ATT_IW, (xoffset & 3) << 1);
230 else
231 vga_io_w(VGA_ATT_IW, xoffset & 7);
232 vga_io_r(VGA_IS1_RC);
233 vga_io_w(VGA_ATT_IW, 0x20);
234 }
235
236 static void vga16fb_update_fix(struct fb_info *info)
237 {
238 if (info->var.bits_per_pixel == 4) {
239 if (info->var.nonstd) {
240 info->fix.type = FB_TYPE_PACKED_PIXELS;
241 info->fix.line_length = info->var.xres_virtual / 2;
242 } else {
243 info->fix.type = FB_TYPE_VGA_PLANES;
244 info->fix.type_aux = FB_AUX_VGA_PLANES_VGA4;
245 info->fix.line_length = info->var.xres_virtual / 8;
246 }
247 } else if (info->var.bits_per_pixel == 0) {
248 info->fix.type = FB_TYPE_TEXT;
249 info->fix.type_aux = FB_AUX_TEXT_CGA;
250 info->fix.line_length = info->var.xres_virtual / 4;
251 } else { /* 8bpp */
252 if (info->var.nonstd) {
253 info->fix.type = FB_TYPE_VGA_PLANES;
254 info->fix.type_aux = FB_AUX_VGA_PLANES_CFB8;
255 info->fix.line_length = info->var.xres_virtual / 4;
256 } else {
257 info->fix.type = FB_TYPE_PACKED_PIXELS;
258 info->fix.line_length = info->var.xres_virtual;
259 }
260 }
261 }
262
263 static void vga16fb_clock_chip(struct vga16fb_par *par,
264 unsigned int pixclock,
265 const struct fb_info *info,
266 int mul, int div)
267 {
268 static struct {
269 u32 pixclock;
270 u8 misc;
271 u8 seq_clock_mode;
272 } *ptr, *best, vgaclocks[] = {
273 { 79442 /* 12.587 */, 0x00, 0x08},
274 { 70616 /* 14.161 */, 0x04, 0x08},
275 { 39721 /* 25.175 */, 0x00, 0x00},
276 { 35308 /* 28.322 */, 0x04, 0x00},
277 { 0 /* bad */, 0x00, 0x00}};
278 int err;
279
280 pixclock = (pixclock * mul) / div;
281 best = vgaclocks;
282 err = pixclock - best->pixclock;
283 if (err < 0) err = -err;
284 for (ptr = vgaclocks + 1; ptr->pixclock; ptr++) {
285 int tmp;
286
287 tmp = pixclock - ptr->pixclock;
288 if (tmp < 0) tmp = -tmp;
289 if (tmp < err) {
290 err = tmp;
291 best = ptr;
292 }
293 }
294 par->misc |= best->misc;
295 par->clkdiv = best->seq_clock_mode;
296 pixclock = (best->pixclock * div) / mul;
297 }
298
299 #define FAIL(X) return -EINVAL
300
301 static int vga16fb_open(struct fb_info *info, int user)
302 {
303 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
304 int cnt = atomic_read(&par->ref_count);
305
306 if (!cnt) {
307 memset(&par->state, 0, sizeof(struct vgastate));
308 par->state.flags = VGA_SAVE_FONTS | VGA_SAVE_MODE |
309 VGA_SAVE_CMAP;
310 save_vga(&par->state);
311 }
312 atomic_inc(&par->ref_count);
313 return 0;
314 }
315
316 static int vga16fb_release(struct fb_info *info, int user)
317 {
318 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
319 int cnt = atomic_read(&par->ref_count);
320
321 if (!cnt)
322 return -EINVAL;
323 if (cnt == 1)
324 restore_vga(&par->state);
325 atomic_dec(&par->ref_count);
326
327 return 0;
328 }
329
330 static int vga16fb_check_var(struct fb_var_screeninfo *var,
331 struct fb_info *info)
332 {
333 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
334 u32 xres, right, hslen, left, xtotal;
335 u32 yres, lower, vslen, upper, ytotal;
336 u32 vxres, xoffset, vyres, yoffset;
337 u32 pos;
338 u8 r7, rMode;
339 int shift;
340 int mode;
341 u32 maxmem;
342
343 par->pel_msk = 0xFF;
344
345 if (var->bits_per_pixel == 4) {
346 if (var->nonstd) {
347 if (!par->isVGA)
348 return -EINVAL;
349 shift = 3;
350 mode = MODE_SKIP4 | MODE_CFB;
351 maxmem = 16384;
352 par->pel_msk = 0x0F;
353 } else {
354 shift = 3;
355 mode = 0;
356 maxmem = 65536;
357 }
358 } else if (var->bits_per_pixel == 8) {
359 if (!par->isVGA)
360 return -EINVAL; /* no support on EGA */
361 shift = 2;
362 if (var->nonstd) {
363 mode = MODE_8BPP | MODE_CFB;
364 maxmem = 65536;
365 } else {
366 mode = MODE_SKIP4 | MODE_8BPP | MODE_CFB;
367 maxmem = 16384;
368 }
369 } else
370 return -EINVAL;
371
372 xres = (var->xres + 7) & ~7;
373 vxres = (var->xres_virtual + 0xF) & ~0xF;
374 xoffset = (var->xoffset + 7) & ~7;
375 left = (var->left_margin + 7) & ~7;
376 right = (var->right_margin + 7) & ~7;
377 hslen = (var->hsync_len + 7) & ~7;
378
379 if (vxres < xres)
380 vxres = xres;
381 if (xres + xoffset > vxres)
382 xoffset = vxres - xres;
383
384 var->xres = xres;
385 var->right_margin = right;
386 var->hsync_len = hslen;
387 var->left_margin = left;
388 var->xres_virtual = vxres;
389 var->xoffset = xoffset;
390
391 xres >>= shift;
392 right >>= shift;
393 hslen >>= shift;
394 left >>= shift;
395 vxres >>= shift;
396 xtotal = xres + right + hslen + left;
397 if (xtotal >= 256)
398 FAIL("xtotal too big");
399 if (hslen > 32)
400 FAIL("hslen too big");
401 if (right + hslen + left > 64)
402 FAIL("hblank too big");
403 par->crtc[VGA_CRTC_H_TOTAL] = xtotal - 5;
404 par->crtc[VGA_CRTC_H_BLANK_START] = xres - 1;
405 par->crtc[VGA_CRTC_H_DISP] = xres - 1;
406 pos = xres + right;
407 par->crtc[VGA_CRTC_H_SYNC_START] = pos;
408 pos += hslen;
409 par->crtc[VGA_CRTC_H_SYNC_END] = pos & 0x1F;
410 pos += left - 2; /* blank_end + 2 <= total + 5 */
411 par->crtc[VGA_CRTC_H_BLANK_END] = (pos & 0x1F) | 0x80;
412 if (pos & 0x20)
413 par->crtc[VGA_CRTC_H_SYNC_END] |= 0x80;
414
415 yres = var->yres;
416 lower = var->lower_margin;
417 vslen = var->vsync_len;
418 upper = var->upper_margin;
419 vyres = var->yres_virtual;
420 yoffset = var->yoffset;
421
422 if (yres > vyres)
423 vyres = yres;
424 if (vxres * vyres > maxmem) {
425 vyres = maxmem / vxres;
426 if (vyres < yres)
427 return -ENOMEM;
428 }
429 if (yoffset + yres > vyres)
430 yoffset = vyres - yres;
431 var->yres = yres;
432 var->lower_margin = lower;
433 var->vsync_len = vslen;
434 var->upper_margin = upper;
435 var->yres_virtual = vyres;
436 var->yoffset = yoffset;
437
438 if (var->vmode & FB_VMODE_DOUBLE) {
439 yres <<= 1;
440 lower <<= 1;
441 vslen <<= 1;
442 upper <<= 1;
443 }
444 ytotal = yres + lower + vslen + upper;
445 if (ytotal > 1024) {
446 ytotal >>= 1;
447 yres >>= 1;
448 lower >>= 1;
449 vslen >>= 1;
450 upper >>= 1;
451 rMode = 0x04;
452 } else
453 rMode = 0x00;
454 if (ytotal > 1024)
455 FAIL("ytotal too big");
456 if (vslen > 16)
457 FAIL("vslen too big");
458 par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;
459 r7 = 0x10; /* disable linecompare */
460 if (ytotal & 0x100) r7 |= 0x01;
461 if (ytotal & 0x200) r7 |= 0x20;
462 par->crtc[VGA_CRTC_PRESET_ROW] = 0;
463 par->crtc[VGA_CRTC_MAX_SCAN] = 0x40; /* 1 scanline, no linecmp */
464 if (var->vmode & FB_VMODE_DOUBLE)
465 par->crtc[VGA_CRTC_MAX_SCAN] |= 0x80;
466 par->crtc[VGA_CRTC_CURSOR_START] = 0x20;
467 par->crtc[VGA_CRTC_CURSOR_END] = 0x00;
468 if ((mode & (MODE_CFB | MODE_8BPP)) == MODE_CFB)
469 xoffset--;
470 pos = yoffset * vxres + (xoffset >> shift);
471 par->crtc[VGA_CRTC_START_HI] = pos >> 8;
472 par->crtc[VGA_CRTC_START_LO] = pos & 0xFF;
473 par->crtc[VGA_CRTC_CURSOR_HI] = 0x00;
474 par->crtc[VGA_CRTC_CURSOR_LO] = 0x00;
475 pos = yres - 1;
476 par->crtc[VGA_CRTC_V_DISP_END] = pos & 0xFF;
477 par->crtc[VGA_CRTC_V_BLANK_START] = pos & 0xFF;
478 if (pos & 0x100)
479 r7 |= 0x0A; /* 0x02 -> DISP_END, 0x08 -> BLANK_START */
480 if (pos & 0x200) {
481 r7 |= 0x40; /* 0x40 -> DISP_END */
482 par->crtc[VGA_CRTC_MAX_SCAN] |= 0x20; /* BLANK_START */
483 }
484 pos += lower;
485 par->crtc[VGA_CRTC_V_SYNC_START] = pos & 0xFF;
486 if (pos & 0x100)
487 r7 |= 0x04;
488 if (pos & 0x200)
489 r7 |= 0x80;
490 pos += vslen;
491 par->crtc[VGA_CRTC_V_SYNC_END] = (pos & 0x0F) & ~0x10; /* disabled IRQ */
492 pos += upper - 1; /* blank_end + 1 <= ytotal + 2 */
493 par->crtc[VGA_CRTC_V_BLANK_END] = pos & 0xFF; /* 0x7F for original VGA,
494 but some SVGA chips requires all 8 bits to set */
495 if (vxres >= 512)
496 FAIL("vxres too long");
497 par->crtc[VGA_CRTC_OFFSET] = vxres >> 1;
498 if (mode & MODE_SKIP4)
499 par->crtc[VGA_CRTC_UNDERLINE] = 0x5F; /* 256, cfb8 */
500 else
501 par->crtc[VGA_CRTC_UNDERLINE] = 0x1F; /* 16, vgap */
502 par->crtc[VGA_CRTC_MODE] = rMode | ((mode & MODE_TEXT) ? 0xA3 : 0xE3);
503 par->crtc[VGA_CRTC_LINE_COMPARE] = 0xFF;
504 par->crtc[VGA_CRTC_OVERFLOW] = r7;
505
506 par->vss = 0x00; /* 3DA */
507
508 par->misc = 0xE3; /* enable CPU, ports 0x3Dx, positive sync */
509 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
510 par->misc &= ~0x40;
511 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
512 par->misc &= ~0x80;
513
514 par->mode = mode;
515
516 if (mode & MODE_8BPP)
517 /* pixel clock == vga clock / 2 */
518 vga16fb_clock_chip(par, var->pixclock, info, 1, 2);
519 else
520 /* pixel clock == vga clock */
521 vga16fb_clock_chip(par, var->pixclock, info, 1, 1);
522
523 var->red.offset = var->green.offset = var->blue.offset =
524 var->transp.offset = 0;
525 var->red.length = var->green.length = var->blue.length =
526 (par->isVGA) ? 6 : 2;
527 var->transp.length = 0;
528 var->activate = FB_ACTIVATE_NOW;
529 var->height = -1;
530 var->width = -1;
531 var->accel_flags = 0;
532 return 0;
533 }
534 #undef FAIL
535
536 static int vga16fb_set_par(struct fb_info *info)
537 {
538 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
539 u8 gdc[VGA_GFX_C];
540 u8 seq[VGA_SEQ_C];
541 u8 atc[VGA_ATT_C];
542 int fh, i;
543
544 seq[VGA_SEQ_CLOCK_MODE] = 0x01 | par->clkdiv;
545 if (par->mode & MODE_TEXT)
546 seq[VGA_SEQ_PLANE_WRITE] = 0x03;
547 else
548 seq[VGA_SEQ_PLANE_WRITE] = 0x0F;
549 seq[VGA_SEQ_CHARACTER_MAP] = 0x00;
550 if (par->mode & MODE_TEXT)
551 seq[VGA_SEQ_MEMORY_MODE] = 0x03;
552 else if (par->mode & MODE_SKIP4)
553 seq[VGA_SEQ_MEMORY_MODE] = 0x0E;
554 else
555 seq[VGA_SEQ_MEMORY_MODE] = 0x06;
556
557 gdc[VGA_GFX_SR_VALUE] = 0x00;
558 gdc[VGA_GFX_SR_ENABLE] = 0x00;
559 gdc[VGA_GFX_COMPARE_VALUE] = 0x00;
560 gdc[VGA_GFX_DATA_ROTATE] = 0x00;
561 gdc[VGA_GFX_PLANE_READ] = 0;
562 if (par->mode & MODE_TEXT) {
563 gdc[VGA_GFX_MODE] = 0x10;
564 gdc[VGA_GFX_MISC] = 0x06;
565 } else {
566 if (par->mode & MODE_CFB)
567 gdc[VGA_GFX_MODE] = 0x40;
568 else
569 gdc[VGA_GFX_MODE] = 0x00;
570 gdc[VGA_GFX_MISC] = 0x05;
571 }
572 gdc[VGA_GFX_COMPARE_MASK] = 0x0F;
573 gdc[VGA_GFX_BIT_MASK] = 0xFF;
574
575 for (i = 0x00; i < 0x10; i++)
576 atc[i] = i;
577 if (par->mode & MODE_TEXT)
578 atc[VGA_ATC_MODE] = 0x04;
579 else if (par->mode & MODE_8BPP)
580 atc[VGA_ATC_MODE] = 0x41;
581 else
582 atc[VGA_ATC_MODE] = 0x81;
583 atc[VGA_ATC_OVERSCAN] = 0x00; /* 0 for EGA, 0xFF for VGA */
584 atc[VGA_ATC_PLANE_ENABLE] = 0x0F;
585 if (par->mode & MODE_8BPP)
586 atc[VGA_ATC_PEL] = (info->var.xoffset & 3) << 1;
587 else
588 atc[VGA_ATC_PEL] = info->var.xoffset & 7;
589 atc[VGA_ATC_COLOR_PAGE] = 0x00;
590
591 if (par->mode & MODE_TEXT) {
592 fh = 16; // FIXME !!! Fudge font height.
593 par->crtc[VGA_CRTC_MAX_SCAN] = (par->crtc[VGA_CRTC_MAX_SCAN]
594 & ~0x1F) | (fh - 1);
595 }
596
597 vga_io_w(VGA_MIS_W, vga_io_r(VGA_MIS_R) | 0x01);
598
599 /* Enable graphics register modification */
600 if (!par->isVGA) {
601 vga_io_w(EGA_GFX_E0, 0x00);
602 vga_io_w(EGA_GFX_E1, 0x01);
603 }
604
605 /* update misc output register */
606 vga_io_w(VGA_MIS_W, par->misc);
607
608 /* synchronous reset on */
609 vga_io_wseq(0x00, 0x01);
610
611 if (par->isVGA)
612 vga_io_w(VGA_PEL_MSK, par->pel_msk);
613
614 /* write sequencer registers */
615 vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE] | 0x20);
616 for (i = 2; i < VGA_SEQ_C; i++) {
617 vga_io_wseq(i, seq[i]);
618 }
619
620 /* synchronous reset off */
621 vga_io_wseq(0x00, 0x03);
622
623 /* deprotect CRT registers 0-7 */
624 vga_io_wcrt(VGA_CRTC_V_SYNC_END, par->crtc[VGA_CRTC_V_SYNC_END]);
625
626 /* write CRT registers */
627 for (i = 0; i < VGA_CRTC_REGS; i++) {
628 vga_io_wcrt(i, par->crtc[i]);
629 }
630
631 /* write graphics controller registers */
632 for (i = 0; i < VGA_GFX_C; i++) {
633 vga_io_wgfx(i, gdc[i]);
634 }
635
636 /* write attribute controller registers */
637 for (i = 0; i < VGA_ATT_C; i++) {
638 vga_io_r(VGA_IS1_RC); /* reset flip-flop */
639 vga_io_wattr(i, atc[i]);
640 }
641
642 /* Wait for screen to stabilize. */
643 mdelay(50);
644
645 vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE]);
646
647 vga_io_r(VGA_IS1_RC);
648 vga_io_w(VGA_ATT_IW, 0x20);
649
650 vga16fb_update_fix(info);
651 return 0;
652 }
653
654 static void ega16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
655 {
656 static unsigned char map[] = { 000, 001, 010, 011 };
657 int val;
658
659 if (regno >= 16)
660 return;
661 val = map[red>>14] | ((map[green>>14]) << 1) | ((map[blue>>14]) << 2);
662 vga_io_r(VGA_IS1_RC); /* ! 0x3BA */
663 vga_io_wattr(regno, val);
664 vga_io_r(VGA_IS1_RC); /* some clones need it */
665 vga_io_w(VGA_ATT_IW, 0x20); /* unblank screen */
666 }
667
668 static void vga16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
669 {
670 outb(regno, dac_reg);
671 outb(red >> 10, dac_val);
672 outb(green >> 10, dac_val);
673 outb(blue >> 10, dac_val);
674 }
675
676 static int vga16fb_setcolreg(unsigned regno, unsigned red, unsigned green,
677 unsigned blue, unsigned transp,
678 struct fb_info *info)
679 {
680 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
681 int gray;
682
683 /*
684 * Set a single color register. The values supplied are
685 * already rounded down to the hardware's capabilities
686 * (according to the entries in the `var' structure). Return
687 * != 0 for invalid regno.
688 */
689
690 if (regno >= 256)
691 return 1;
692
693 gray = info->var.grayscale;
694
695 if (gray) {
696 /* gray = 0.30*R + 0.59*G + 0.11*B */
697 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
698 }
699 if (par->isVGA)
700 vga16_setpalette(regno,red,green,blue);
701 else
702 ega16_setpalette(regno,red,green,blue);
703 return 0;
704 }
705
706 static int vga16fb_pan_display(struct fb_var_screeninfo *var,
707 struct fb_info *info)
708 {
709 if (var->xoffset + info->var.xres > info->var.xres_virtual ||
710 var->yoffset + info->var.yres > info->var.yres_virtual)
711 return -EINVAL;
712
713 vga16fb_pan_var(info, var);
714
715 info->var.xoffset = var->xoffset;
716 info->var.yoffset = var->yoffset;
717 info->var.vmode &= ~FB_VMODE_YWRAP;
718 return 0;
719 }
720
721 /* The following VESA blanking code is taken from vgacon.c. The VGA
722 blanking code was originally by Huang shi chao, and modified by
723 Christoph Rimek (chrimek@toppoint.de) and todd j. derr
724 (tjd@barefoot.org) for Linux. */
725 #define attrib_port VGA_ATC_IW
726 #define seq_port_reg VGA_SEQ_I
727 #define seq_port_val VGA_SEQ_D
728 #define gr_port_reg VGA_GFX_I
729 #define gr_port_val VGA_GFX_D
730 #define video_misc_rd VGA_MIS_R
731 #define video_misc_wr VGA_MIS_W
732 #define vga_video_port_reg VGA_CRT_IC
733 #define vga_video_port_val VGA_CRT_DC
734
735 static void vga_vesa_blank(struct vga16fb_par *par, int mode)
736 {
737 unsigned char SeqCtrlIndex;
738 unsigned char CrtCtrlIndex;
739
740 //cli();
741 SeqCtrlIndex = vga_io_r(seq_port_reg);
742 CrtCtrlIndex = vga_io_r(vga_video_port_reg);
743
744 /* save original values of VGA controller registers */
745 if(!par->vesa_blanked) {
746 par->vga_state.CrtMiscIO = vga_io_r(video_misc_rd);
747 //sti();
748
749 par->vga_state.HorizontalTotal = vga_io_rcrt(0x00); /* HorizontalTotal */
750 par->vga_state.HorizDisplayEnd = vga_io_rcrt(0x01); /* HorizDisplayEnd */
751 par->vga_state.StartHorizRetrace = vga_io_rcrt(0x04); /* StartHorizRetrace */
752 par->vga_state.EndHorizRetrace = vga_io_rcrt(0x05); /* EndHorizRetrace */
753 par->vga_state.Overflow = vga_io_rcrt(0x07); /* Overflow */
754 par->vga_state.StartVertRetrace = vga_io_rcrt(0x10); /* StartVertRetrace */
755 par->vga_state.EndVertRetrace = vga_io_rcrt(0x11); /* EndVertRetrace */
756 par->vga_state.ModeControl = vga_io_rcrt(0x17); /* ModeControl */
757 par->vga_state.ClockingMode = vga_io_rseq(0x01); /* ClockingMode */
758 }
759
760 /* assure that video is enabled */
761 /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
762 //cli();
763 vga_io_wseq(0x01, par->vga_state.ClockingMode | 0x20);
764
765 /* test for vertical retrace in process.... */
766 if ((par->vga_state.CrtMiscIO & 0x80) == 0x80)
767 vga_io_w(video_misc_wr, par->vga_state.CrtMiscIO & 0xef);
768
769 /*
770 * Set <End of vertical retrace> to minimum (0) and
771 * <Start of vertical Retrace> to maximum (incl. overflow)
772 * Result: turn off vertical sync (VSync) pulse.
773 */
774 if (mode & FB_BLANK_VSYNC_SUSPEND) {
775 outb_p(0x10,vga_video_port_reg); /* StartVertRetrace */
776 outb_p(0xff,vga_video_port_val); /* maximum value */
777 outb_p(0x11,vga_video_port_reg); /* EndVertRetrace */
778 outb_p(0x40,vga_video_port_val); /* minimum (bits 0..3) */
779 outb_p(0x07,vga_video_port_reg); /* Overflow */
780 outb_p(par->vga_state.Overflow | 0x84,vga_video_port_val); /* bits 9,10 of vert. retrace */
781 }
782
783 if (mode & FB_BLANK_HSYNC_SUSPEND) {
784 /*
785 * Set <End of horizontal retrace> to minimum (0) and
786 * <Start of horizontal Retrace> to maximum
787 * Result: turn off horizontal sync (HSync) pulse.
788 */
789 outb_p(0x04,vga_video_port_reg); /* StartHorizRetrace */
790 outb_p(0xff,vga_video_port_val); /* maximum */
791 outb_p(0x05,vga_video_port_reg); /* EndHorizRetrace */
792 outb_p(0x00,vga_video_port_val); /* minimum (0) */
793 }
794
795 /* restore both index registers */
796 outb_p(SeqCtrlIndex,seq_port_reg);
797 outb_p(CrtCtrlIndex,vga_video_port_reg);
798 //sti();
799 }
800
801 static void vga_vesa_unblank(struct vga16fb_par *par)
802 {
803 unsigned char SeqCtrlIndex;
804 unsigned char CrtCtrlIndex;
805
806 //cli();
807 SeqCtrlIndex = vga_io_r(seq_port_reg);
808 CrtCtrlIndex = vga_io_r(vga_video_port_reg);
809
810 /* restore original values of VGA controller registers */
811 vga_io_w(video_misc_wr, par->vga_state.CrtMiscIO);
812
813 /* HorizontalTotal */
814 vga_io_wcrt(0x00, par->vga_state.HorizontalTotal);
815 /* HorizDisplayEnd */
816 vga_io_wcrt(0x01, par->vga_state.HorizDisplayEnd);
817 /* StartHorizRetrace */
818 vga_io_wcrt(0x04, par->vga_state.StartHorizRetrace);
819 /* EndHorizRetrace */
820 vga_io_wcrt(0x05, par->vga_state.EndHorizRetrace);
821 /* Overflow */
822 vga_io_wcrt(0x07, par->vga_state.Overflow);
823 /* StartVertRetrace */
824 vga_io_wcrt(0x10, par->vga_state.StartVertRetrace);
825 /* EndVertRetrace */
826 vga_io_wcrt(0x11, par->vga_state.EndVertRetrace);
827 /* ModeControl */
828 vga_io_wcrt(0x17, par->vga_state.ModeControl);
829 /* ClockingMode */
830 vga_io_wseq(0x01, par->vga_state.ClockingMode);
831
832 /* restore index/control registers */
833 vga_io_w(seq_port_reg, SeqCtrlIndex);
834 vga_io_w(vga_video_port_reg, CrtCtrlIndex);
835 //sti();
836 }
837
838 static void vga_pal_blank(void)
839 {
840 int i;
841
842 for (i=0; i<16; i++) {
843 outb_p (i, dac_reg) ;
844 outb_p (0, dac_val) ;
845 outb_p (0, dac_val) ;
846 outb_p (0, dac_val) ;
847 }
848 }
849
850 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
851 static int vga16fb_blank(int blank, struct fb_info *info)
852 {
853 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
854
855 switch (blank) {
856 case FB_BLANK_UNBLANK: /* Unblank */
857 if (par->vesa_blanked) {
858 vga_vesa_unblank(par);
859 par->vesa_blanked = 0;
860 }
861 if (par->palette_blanked) {
862 par->palette_blanked = 0;
863 }
864 break;
865 case FB_BLANK_NORMAL: /* blank */
866 vga_pal_blank();
867 par->palette_blanked = 1;
868 break;
869 default: /* VESA blanking */
870 vga_vesa_blank(par, blank);
871 par->vesa_blanked = 1;
872 break;
873 }
874 return 0;
875 }
876
877 static void vga_8planes_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
878 {
879 u32 dx = rect->dx, width = rect->width;
880 char oldindex = getindex();
881 char oldmode = setmode(0x40);
882 char oldmask = selectmask();
883 int line_ofs, height;
884 char oldop, oldsr;
885 char __iomem *where;
886
887 dx /= 4;
888 where = info->screen_base + dx + rect->dy * info->fix.line_length;
889
890 if (rect->rop == ROP_COPY) {
891 oldop = setop(0);
892 oldsr = setsr(0);
893
894 width /= 4;
895 line_ofs = info->fix.line_length - width;
896 setmask(0xff);
897
898 height = rect->height;
899
900 while (height--) {
901 int x;
902
903 /* we can do memset... */
904 for (x = width; x > 0; --x) {
905 writeb(rect->color, where);
906 where++;
907 }
908 where += line_ofs;
909 }
910 } else {
911 char oldcolor = setcolor(0xf);
912 int y;
913
914 oldop = setop(0x18);
915 oldsr = setsr(0xf);
916 setmask(0x0F);
917 for (y = 0; y < rect->height; y++) {
918 rmw(where);
919 rmw(where+1);
920 where += info->fix.line_length;
921 }
922 setcolor(oldcolor);
923 }
924 setmask(oldmask);
925 setsr(oldsr);
926 setop(oldop);
927 setmode(oldmode);
928 setindex(oldindex);
929 }
930
931 static void vga16fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
932 {
933 int x, x2, y2, vxres, vyres, width, height, line_ofs;
934 char __iomem *dst;
935
936 vxres = info->var.xres_virtual;
937 vyres = info->var.yres_virtual;
938
939 if (!rect->width || !rect->height || rect->dx > vxres || rect->dy > vyres)
940 return;
941
942 /* We could use hardware clipping but on many cards you get around
943 * hardware clipping by writing to framebuffer directly. */
944
945 x2 = rect->dx + rect->width;
946 y2 = rect->dy + rect->height;
947 x2 = x2 < vxres ? x2 : vxres;
948 y2 = y2 < vyres ? y2 : vyres;
949 width = x2 - rect->dx;
950
951 switch (info->fix.type) {
952 case FB_TYPE_VGA_PLANES:
953 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
954
955 height = y2 - rect->dy;
956 width = rect->width/8;
957
958 line_ofs = info->fix.line_length - width;
959 dst = info->screen_base + (rect->dx/8) + rect->dy * info->fix.line_length;
960
961 switch (rect->rop) {
962 case ROP_COPY:
963 setmode(0);
964 setop(0);
965 setsr(0xf);
966 setcolor(rect->color);
967 selectmask();
968
969 setmask(0xff);
970
971 while (height--) {
972 for (x = 0; x < width; x++) {
973 writeb(0, dst);
974 dst++;
975 }
976 dst += line_ofs;
977 }
978 break;
979 case ROP_XOR:
980 setmode(0);
981 setop(0x18);
982 setsr(0xf);
983 setcolor(0xf);
984 selectmask();
985
986 setmask(0xff);
987 while (height--) {
988 for (x = 0; x < width; x++) {
989 rmw(dst);
990 dst++;
991 }
992 dst += line_ofs;
993 }
994 break;
995 }
996 } else
997 vga_8planes_fillrect(info, rect);
998 break;
999 case FB_TYPE_PACKED_PIXELS:
1000 default:
1001 cfb_fillrect(info, rect);
1002 break;
1003 }
1004 }
1005
1006 static void vga_8planes_copyarea(struct fb_info *info, const struct fb_copyarea *area)
1007 {
1008 char oldindex = getindex();
1009 char oldmode = setmode(0x41);
1010 char oldop = setop(0);
1011 char oldsr = setsr(0xf);
1012 int height, line_ofs, x;
1013 u32 sx, dx, width;
1014 char __iomem *dest;
1015 char __iomem *src;
1016
1017 height = area->height;
1018
1019 sx = area->sx / 4;
1020 dx = area->dx / 4;
1021 width = area->width / 4;
1022
1023 if (area->dy < area->sy || (area->dy == area->sy && dx < sx)) {
1024 line_ofs = info->fix.line_length - width;
1025 dest = info->screen_base + dx + area->dy * info->fix.line_length;
1026 src = info->screen_base + sx + area->sy * info->fix.line_length;
1027 while (height--) {
1028 for (x = 0; x < width; x++) {
1029 readb(src);
1030 writeb(0, dest);
1031 src++;
1032 dest++;
1033 }
1034 src += line_ofs;
1035 dest += line_ofs;
1036 }
1037 } else {
1038 line_ofs = info->fix.line_length - width;
1039 dest = info->screen_base + dx + width +
1040 (area->dy + height - 1) * info->fix.line_length;
1041 src = info->screen_base + sx + width +
1042 (area->sy + height - 1) * info->fix.line_length;
1043 while (height--) {
1044 for (x = 0; x < width; x++) {
1045 --src;
1046 --dest;
1047 readb(src);
1048 writeb(0, dest);
1049 }
1050 src -= line_ofs;
1051 dest -= line_ofs;
1052 }
1053 }
1054
1055 setsr(oldsr);
1056 setop(oldop);
1057 setmode(oldmode);
1058 setindex(oldindex);
1059 }
1060
1061 static void vga16fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
1062 {
1063 u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
1064 int x, x2, y2, old_dx, old_dy, vxres, vyres;
1065 int height, width, line_ofs;
1066 char __iomem *dst = NULL;
1067 char __iomem *src = NULL;
1068
1069 vxres = info->var.xres_virtual;
1070 vyres = info->var.yres_virtual;
1071
1072 if (area->dx > vxres || area->sx > vxres || area->dy > vyres ||
1073 area->sy > vyres)
1074 return;
1075
1076 /* clip the destination */
1077 old_dx = area->dx;
1078 old_dy = area->dy;
1079
1080 /*
1081 * We could use hardware clipping but on many cards you get around
1082 * hardware clipping by writing to framebuffer directly.
1083 */
1084 x2 = area->dx + area->width;
1085 y2 = area->dy + area->height;
1086 dx = area->dx > 0 ? area->dx : 0;
1087 dy = area->dy > 0 ? area->dy : 0;
1088 x2 = x2 < vxres ? x2 : vxres;
1089 y2 = y2 < vyres ? y2 : vyres;
1090 width = x2 - dx;
1091 height = y2 - dy;
1092
1093 /* update sx1,sy1 */
1094 sx += (dx - old_dx);
1095 sy += (dy - old_dy);
1096
1097 /* the source must be completely inside the virtual screen */
1098 if (sx < 0 || sy < 0 || (sx + width) > vxres || (sy + height) > vyres)
1099 return;
1100
1101 switch (info->fix.type) {
1102 case FB_TYPE_VGA_PLANES:
1103 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
1104 width = width/8;
1105 height = height;
1106 line_ofs = info->fix.line_length - width;
1107
1108 setmode(1);
1109 setop(0);
1110 setsr(0xf);
1111
1112 if (dy < sy || (dy == sy && dx < sx)) {
1113 dst = info->screen_base + (dx/8) + dy * info->fix.line_length;
1114 src = info->screen_base + (sx/8) + sy * info->fix.line_length;
1115 while (height--) {
1116 for (x = 0; x < width; x++) {
1117 readb(src);
1118 writeb(0, dst);
1119 dst++;
1120 src++;
1121 }
1122 src += line_ofs;
1123 dst += line_ofs;
1124 }
1125 } else {
1126 dst = info->screen_base + (dx/8) + width +
1127 (dy + height - 1) * info->fix.line_length;
1128 src = info->screen_base + (sx/8) + width +
1129 (sy + height - 1) * info->fix.line_length;
1130 while (height--) {
1131 for (x = 0; x < width; x++) {
1132 dst--;
1133 src--;
1134 readb(src);
1135 writeb(0, dst);
1136 }
1137 src -= line_ofs;
1138 dst -= line_ofs;
1139 }
1140 }
1141 } else
1142 vga_8planes_copyarea(info, area);
1143 break;
1144 case FB_TYPE_PACKED_PIXELS:
1145 default:
1146 cfb_copyarea(info, area);
1147 break;
1148 }
1149 }
1150
1151 #ifdef __LITTLE_ENDIAN
1152 static unsigned int transl_l[] =
1153 {0x0,0x8,0x4,0xC,0x2,0xA,0x6,0xE,0x1,0x9,0x5,0xD,0x3,0xB,0x7,0xF};
1154 static unsigned int transl_h[] =
1155 {0x000, 0x800, 0x400, 0xC00, 0x200, 0xA00, 0x600, 0xE00,
1156 0x100, 0x900, 0x500, 0xD00, 0x300, 0xB00, 0x700, 0xF00};
1157 #else
1158 #ifdef __BIG_ENDIAN
1159 static unsigned int transl_h[] =
1160 {0x0,0x8,0x4,0xC,0x2,0xA,0x6,0xE,0x1,0x9,0x5,0xD,0x3,0xB,0x7,0xF};
1161 static unsigned int transl_l[] =
1162 {0x000, 0x800, 0x400, 0xC00, 0x200, 0xA00, 0x600, 0xE00,
1163 0x100, 0x900, 0x500, 0xD00, 0x300, 0xB00, 0x700, 0xF00};
1164 #else
1165 #error "Only __BIG_ENDIAN and __LITTLE_ENDIAN are supported in vga-planes"
1166 #endif
1167 #endif
1168
1169 static void vga_8planes_imageblit(struct fb_info *info, const struct fb_image *image)
1170 {
1171 char oldindex = getindex();
1172 char oldmode = setmode(0x40);
1173 char oldop = setop(0);
1174 char oldsr = setsr(0);
1175 char oldmask = selectmask();
1176 const char *cdat = image->data;
1177 u32 dx = image->dx;
1178 char __iomem *where;
1179 int y;
1180
1181 dx /= 4;
1182 where = info->screen_base + dx + image->dy * info->fix.line_length;
1183
1184 setmask(0xff);
1185 writeb(image->bg_color, where);
1186 readb(where);
1187 selectmask();
1188 setmask(image->fg_color ^ image->bg_color);
1189 setmode(0x42);
1190 setop(0x18);
1191 for (y = 0; y < image->height; y++, where += info->fix.line_length)
1192 writew(transl_h[cdat[y]&0xF] | transl_l[cdat[y] >> 4], where);
1193 setmask(oldmask);
1194 setsr(oldsr);
1195 setop(oldop);
1196 setmode(oldmode);
1197 setindex(oldindex);
1198 }
1199
1200 static void vga_imageblit_expand(struct fb_info *info, const struct fb_image *image)
1201 {
1202 char __iomem *where = info->screen_base + (image->dx/8) +
1203 image->dy * info->fix.line_length;
1204 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
1205 char *cdat = (char *) image->data;
1206 char __iomem *dst;
1207 int x, y;
1208
1209 switch (info->fix.type) {
1210 case FB_TYPE_VGA_PLANES:
1211 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
1212 if (par->isVGA) {
1213 setmode(2);
1214 setop(0);
1215 setsr(0xf);
1216 setcolor(image->fg_color);
1217 selectmask();
1218
1219 setmask(0xff);
1220 writeb(image->bg_color, where);
1221 rmb();
1222 readb(where); /* fill latches */
1223 setmode(3);
1224 wmb();
1225 for (y = 0; y < image->height; y++) {
1226 dst = where;
1227 for (x = image->width/8; x--;)
1228 writeb(*cdat++, dst++);
1229 where += info->fix.line_length;
1230 }
1231 wmb();
1232 } else {
1233 setmode(0);
1234 setop(0);
1235 setsr(0xf);
1236 setcolor(image->bg_color);
1237 selectmask();
1238
1239 setmask(0xff);
1240 for (y = 0; y < image->height; y++) {
1241 dst = where;
1242 for (x=image->width/8; x--;){
1243 rmw(dst);
1244 setcolor(image->fg_color);
1245 selectmask();
1246 if (*cdat) {
1247 setmask(*cdat++);
1248 rmw(dst++);
1249 }
1250 }
1251 where += info->fix.line_length;
1252 }
1253 }
1254 } else
1255 vga_8planes_imageblit(info, image);
1256 break;
1257 case FB_TYPE_PACKED_PIXELS:
1258 default:
1259 cfb_imageblit(info, image);
1260 break;
1261 }
1262 }
1263
1264 static void vga_imageblit_color(struct fb_info *info, const struct fb_image *image)
1265 {
1266 /*
1267 * Draw logo
1268 */
1269 struct vga16fb_par *par = (struct vga16fb_par *) info->par;
1270 char __iomem *where =
1271 info->screen_base + image->dy * info->fix.line_length +
1272 image->dx/8;
1273 const char *cdat = image->data;
1274 char __iomem *dst;
1275 int x, y;
1276
1277 switch (info->fix.type) {
1278 case FB_TYPE_VGA_PLANES:
1279 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4 &&
1280 par->isVGA) {
1281 setsr(0xf);
1282 setop(0);
1283 setmode(0);
1284
1285 for (y = 0; y < image->height; y++) {
1286 for (x = 0; x < image->width; x++) {
1287 dst = where + x/8;
1288
1289 setcolor(*cdat);
1290 selectmask();
1291 setmask(1 << (7 - (x % 8)));
1292 fb_readb(dst);
1293 fb_writeb(0, dst);
1294
1295 cdat++;
1296 }
1297 where += info->fix.line_length;
1298 }
1299 }
1300 break;
1301 case FB_TYPE_PACKED_PIXELS:
1302 cfb_imageblit(info, image);
1303 break;
1304 default:
1305 break;
1306 }
1307 }
1308
1309 static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image)
1310 {
1311 if (image->depth == 1)
1312 vga_imageblit_expand(info, image);
1313 else
1314 vga_imageblit_color(info, image);
1315 }
1316
1317 static struct fb_ops vga16fb_ops = {
1318 .owner = THIS_MODULE,
1319 .fb_open = vga16fb_open,
1320 .fb_release = vga16fb_release,
1321 .fb_check_var = vga16fb_check_var,
1322 .fb_set_par = vga16fb_set_par,
1323 .fb_setcolreg = vga16fb_setcolreg,
1324 .fb_pan_display = vga16fb_pan_display,
1325 .fb_blank = vga16fb_blank,
1326 .fb_fillrect = vga16fb_fillrect,
1327 .fb_copyarea = vga16fb_copyarea,
1328 .fb_imageblit = vga16fb_imageblit,
1329 .fb_cursor = soft_cursor,
1330 };
1331
1332 #ifndef MODULE
1333 static int vga16fb_setup(char *options)
1334 {
1335 char *this_opt;
1336
1337 if (!options || !*options)
1338 return 0;
1339
1340 while ((this_opt = strsep(&options, ",")) != NULL) {
1341 if (!*this_opt) continue;
1342 }
1343 return 0;
1344 }
1345 #endif
1346
1347 static int __init vga16fb_init(void)
1348 {
1349 int i;
1350 int ret;
1351 #ifndef MODULE
1352 char *option = NULL;
1353
1354 if (fb_get_options("vga16fb", &option))
1355 return -ENODEV;
1356
1357 vga16fb_setup(option);
1358 #endif
1359 printk(KERN_DEBUG "vga16fb: initializing\n");
1360
1361 /* XXX share VGA_FB_PHYS and I/O region with vgacon and others */
1362
1363 vga16fb.screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS);
1364 if (!vga16fb.screen_base) {
1365 printk(KERN_ERR "vga16fb: unable to map device\n");
1366 ret = -ENOMEM;
1367 goto err_ioremap;
1368 }
1369 printk(KERN_INFO "vga16fb: mapped to 0x%p\n", vga16fb.screen_base);
1370
1371 vga16_par.isVGA = ORIG_VIDEO_ISVGA;
1372 vga16_par.palette_blanked = 0;
1373 vga16_par.vesa_blanked = 0;
1374
1375 i = vga16_par.isVGA? 6 : 2;
1376
1377 vga16fb_defined.red.length = i;
1378 vga16fb_defined.green.length = i;
1379 vga16fb_defined.blue.length = i;
1380
1381 /* name should not depend on EGA/VGA */
1382 vga16fb.fbops = &vga16fb_ops;
1383 vga16fb.var = vga16fb_defined;
1384 vga16fb.fix = vga16fb_fix;
1385 vga16fb.par = &vga16_par;
1386 vga16fb.flags = FBINFO_FLAG_DEFAULT |
1387 FBINFO_HWACCEL_YPAN;
1388
1389 i = (vga16fb_defined.bits_per_pixel == 8) ? 256 : 16;
1390 ret = fb_alloc_cmap(&vga16fb.cmap, i, 0);
1391 if (ret) {
1392 printk(KERN_ERR "vga16fb: unable to allocate colormap\n");
1393 ret = -ENOMEM;
1394 goto err_alloc_cmap;
1395 }
1396
1397 if (vga16fb_check_var(&vga16fb.var, &vga16fb)) {
1398 printk(KERN_ERR "vga16fb: unable to validate variable\n");
1399 ret = -EINVAL;
1400 goto err_check_var;
1401 }
1402
1403 vga16fb_update_fix(&vga16fb);
1404
1405 if (register_framebuffer(&vga16fb) < 0) {
1406 printk(KERN_ERR "vga16fb: unable to register framebuffer\n");
1407 ret = -EINVAL;
1408 goto err_check_var;
1409 }
1410
1411 printk(KERN_INFO "fb%d: %s frame buffer device\n",
1412 vga16fb.node, vga16fb.fix.id);
1413
1414 return 0;
1415
1416 err_check_var:
1417 fb_dealloc_cmap(&vga16fb.cmap);
1418 err_alloc_cmap:
1419 iounmap(vga16fb.screen_base);
1420 err_ioremap:
1421 return ret;
1422 }
1423
1424 static void __exit vga16fb_exit(void)
1425 {
1426 unregister_framebuffer(&vga16fb);
1427 iounmap(vga16fb.screen_base);
1428 fb_dealloc_cmap(&vga16fb.cmap);
1429 /* XXX unshare VGA regions */
1430 }
1431
1432 MODULE_LICENSE("GPL");
1433 module_init(vga16fb_init);
1434 module_exit(vga16fb_exit);
1435
1436
1437 /*
1438 * Overrides for Emacs so that we follow Linus's tabbing style.
1439 * ---------------------------------------------------------------------------
1440 * Local variables:
1441 * c-basic-offset: 8
1442 * End:
1443 */
1444
Linux with added FPC-III support