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[PATCH] constify vga16fb.c
[linux-2.6/mini2440.git] / drivers / video / vga16fb.c
blob6aff63d5b295f97211a88ef84243f16613d4c7a1
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/slab.h>
19 #include <linux/delay.h>
20 #include <linux/fb.h>
21 #include <linux/ioport.h>
22 #include <linux/init.h>
23 #include <linux/platform_device.h>
24 #include <linux/screen_info.h>
25
26 #include <asm/io.h>
27 #include <video/vga.h>
28
29 #define GRAPHICS_ADDR_REG VGA_GFX_I /* Graphics address register. */
30 #define GRAPHICS_DATA_REG VGA_GFX_D /* Graphics data register. */
31
32 #define SET_RESET_INDEX VGA_GFX_SR_VALUE /* Set/Reset Register index. */
33 #define ENABLE_SET_RESET_INDEX VGA_GFX_SR_ENABLE /* Enable Set/Reset Register index. */
34 #define DATA_ROTATE_INDEX VGA_GFX_DATA_ROTATE /* Data Rotate Register index. */
35 #define GRAPHICS_MODE_INDEX VGA_GFX_MODE /* Graphics Mode Register index. */
36 #define BIT_MASK_INDEX VGA_GFX_BIT_MASK /* Bit Mask Register index. */
37
38 #define dac_reg (VGA_PEL_IW)
39 #define dac_val (VGA_PEL_D)
40
41 #define VGA_FB_PHYS 0xA0000
42 #define VGA_FB_PHYS_LEN 65536
43
44 #define MODE_SKIP4 1
45 #define MODE_8BPP 2
46 #define MODE_CFB 4
47 #define MODE_TEXT 8
48
49 /* --------------------------------------------------------------------- */
50
51 /*
52 * card parameters
53 */
54
55 struct vga16fb_par {
56 /* structure holding original VGA register settings when the
57 screen is blanked */
58 struct {
59 unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
60 unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
61 unsigned char CrtMiscIO; /* Miscellaneous register */
62 unsigned char HorizontalTotal; /* CRT-Controller:00h */
63 unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
64 unsigned char StartHorizRetrace;/* CRT-Controller:04h */
65 unsigned char EndHorizRetrace; /* CRT-Controller:05h */
66 unsigned char Overflow; /* CRT-Controller:07h */
67 unsigned char StartVertRetrace; /* CRT-Controller:10h */
68 unsigned char EndVertRetrace; /* CRT-Controller:11h */
69 unsigned char ModeControl; /* CRT-Controller:17h */
70 unsigned char ClockingMode; /* Seq-Controller:01h */
71 } vga_state;
72 struct vgastate state;
73 atomic_t ref_count;
74 int palette_blanked, vesa_blanked, mode, isVGA;
75 u8 misc, pel_msk, vss, clkdiv;
76 u8 crtc[VGA_CRT_C];
77 };
78
79 /* --------------------------------------------------------------------- */
80
81 static struct fb_var_screeninfo vga16fb_defined __initdata = {
82 .xres = 640,
83 .yres = 480,
84 .xres_virtual = 640,
85 .yres_virtual = 480,
86 .bits_per_pixel = 4,
87 .activate = FB_ACTIVATE_TEST,
88 .height = -1,
89 .width = -1,
90 .pixclock = 39721,
91 .left_margin = 48,
92 .right_margin = 16,
93 .upper_margin = 33,
94 .lower_margin = 10,
95 .hsync_len = 96,
96 .vsync_len = 2,
97 .vmode = FB_VMODE_NONINTERLACED,
98 };
99
100 /* name should not depend on EGA/VGA */
101 static struct fb_fix_screeninfo vga16fb_fix __initdata = {
102 .id = "VGA16 VGA",
103 .smem_start = VGA_FB_PHYS,
104 .smem_len = VGA_FB_PHYS_LEN,
105 .type = FB_TYPE_VGA_PLANES,
106 .type_aux = FB_AUX_VGA_PLANES_VGA4,
107 .visual = FB_VISUAL_PSEUDOCOLOR,
108 .xpanstep = 8,
109 .ypanstep = 1,
110 .line_length = 640/8,
111 .accel = FB_ACCEL_NONE
112 };
113
114 /* The VGA's weird architecture often requires that we read a byte and
115 write a byte to the same location. It doesn't matter *what* byte
116 we write, however. This is because all the action goes on behind
117 the scenes in the VGA's 32-bit latch register, and reading and writing
118 video memory just invokes latch behavior.
119
120 To avoid race conditions (is this necessary?), reading and writing
121 the memory byte should be done with a single instruction. One
122 suitable instruction is the x86 bitwise OR. The following
123 read-modify-write routine should optimize to one such bitwise
124 OR. */
125 static inline void rmw(volatile char __iomem *p)
126 {
127 readb(p);
128 writeb(1, p);
129 }
130
131 /* Set the Graphics Mode Register, and return its previous value.
132 Bits 0-1 are write mode, bit 3 is read mode. */
133 static inline int setmode(int mode)
134 {
135 int oldmode;
136
137 vga_io_w(GRAPHICS_ADDR_REG, GRAPHICS_MODE_INDEX);
138 oldmode = vga_io_r(GRAPHICS_DATA_REG);
139 vga_io_w(GRAPHICS_DATA_REG, mode);
140 return oldmode;
141 }
142
143 /* Select the Bit Mask Register and return its value. */
144 static inline int selectmask(void)
145 {
146 return vga_io_rgfx(BIT_MASK_INDEX);
147 }
148
149 /* Set the value of the Bit Mask Register. It must already have been
150 selected with selectmask(). */
151 static inline void setmask(int mask)
152 {
153 vga_io_w(GRAPHICS_DATA_REG, mask);
154 }
155
156 /* Set the Data Rotate Register and return its old value.
157 Bits 0-2 are rotate count, bits 3-4 are logical operation
158 (0=NOP, 1=AND, 2=OR, 3=XOR). */
159 static inline int setop(int op)
160 {
161 int oldop;
162
163 vga_io_w(GRAPHICS_ADDR_REG, DATA_ROTATE_INDEX);
164 oldop = vga_io_r(GRAPHICS_DATA_REG);
165 vga_io_w(GRAPHICS_DATA_REG, op);
166 return oldop;
167 }
168
169 /* Set the Enable Set/Reset Register and return its old value.
170 The code here always uses value 0xf for thsi register. */
171 static inline int setsr(int sr)
172 {
173 int oldsr;
174
175 vga_io_w(GRAPHICS_ADDR_REG, ENABLE_SET_RESET_INDEX);
176 oldsr = vga_io_r(GRAPHICS_DATA_REG);
177 vga_io_w(GRAPHICS_DATA_REG, sr);
178 return oldsr;
179 }
180
181 /* Set the Set/Reset Register and return its old value. */
182 static inline int setcolor(int color)
183 {
184 int oldcolor;
185
186 vga_io_w(GRAPHICS_ADDR_REG, SET_RESET_INDEX);
187 oldcolor = vga_io_r(GRAPHICS_DATA_REG);
188 vga_io_w(GRAPHICS_DATA_REG, color);
189 return oldcolor;
190 }
191
192 /* Return the value in the Graphics Address Register. */
193 static inline int getindex(void)
194 {
195 return vga_io_r(GRAPHICS_ADDR_REG);
196 }
197
198 /* Set the value in the Graphics Address Register. */
199 static inline void setindex(int index)
200 {
201 vga_io_w(GRAPHICS_ADDR_REG, index);
202 }
203
204 static void vga16fb_pan_var(struct fb_info *info,
205 struct fb_var_screeninfo *var)
206 {
207 struct vga16fb_par *par = info->par;
208 u32 xoffset, pos;
209
210 xoffset = var->xoffset;
211 if (info->var.bits_per_pixel == 8) {
212 pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 2;
213 } else if (par->mode & MODE_TEXT) {
214 int fh = 16; // FIXME !!! font height. Fugde for now.
215 pos = (info->var.xres_virtual * (var->yoffset / fh) + xoffset) >> 3;
216 } else {
217 if (info->var.nonstd)
218 xoffset--;
219 pos = (info->var.xres_virtual * var->yoffset + xoffset) >> 3;
220 }
221 vga_io_wcrt(VGA_CRTC_START_HI, pos >> 8);
222 vga_io_wcrt(VGA_CRTC_START_LO, pos & 0xFF);
223 /* if we support CFB4, then we must! support xoffset with pixel
224 * granularity if someone supports xoffset in bit resolution */
225 vga_io_r(VGA_IS1_RC); /* reset flip-flop */
226 vga_io_w(VGA_ATT_IW, VGA_ATC_PEL);
227 if (var->bits_per_pixel == 8)
228 vga_io_w(VGA_ATT_IW, (xoffset & 3) << 1);
229 else
230 vga_io_w(VGA_ATT_IW, xoffset & 7);
231 vga_io_r(VGA_IS1_RC);
232 vga_io_w(VGA_ATT_IW, 0x20);
233 }
234
235 static void vga16fb_update_fix(struct fb_info *info)
236 {
237 if (info->var.bits_per_pixel == 4) {
238 if (info->var.nonstd) {
239 info->fix.type = FB_TYPE_PACKED_PIXELS;
240 info->fix.line_length = info->var.xres_virtual / 2;
241 } else {
242 info->fix.type = FB_TYPE_VGA_PLANES;
243 info->fix.type_aux = FB_AUX_VGA_PLANES_VGA4;
244 info->fix.line_length = info->var.xres_virtual / 8;
245 }
246 } else if (info->var.bits_per_pixel == 0) {
247 info->fix.type = FB_TYPE_TEXT;
248 info->fix.type_aux = FB_AUX_TEXT_CGA;
249 info->fix.line_length = info->var.xres_virtual / 4;
250 } else { /* 8bpp */
251 if (info->var.nonstd) {
252 info->fix.type = FB_TYPE_VGA_PLANES;
253 info->fix.type_aux = FB_AUX_VGA_PLANES_CFB8;
254 info->fix.line_length = info->var.xres_virtual / 4;
255 } else {
256 info->fix.type = FB_TYPE_PACKED_PIXELS;
257 info->fix.line_length = info->var.xres_virtual;
258 }
259 }
260 }
261
262 static void vga16fb_clock_chip(struct vga16fb_par *par,
263 unsigned int pixclock,
264 const struct fb_info *info,
265 int mul, int div)
266 {
267 static const struct {
268 u32 pixclock;
269 u8 misc;
270 u8 seq_clock_mode;
271 } *ptr, *best, vgaclocks[] = {
272 { 79442 /* 12.587 */, 0x00, 0x08},
273 { 70616 /* 14.161 */, 0x04, 0x08},
274 { 39721 /* 25.175 */, 0x00, 0x00},
275 { 35308 /* 28.322 */, 0x04, 0x00},
276 { 0 /* bad */, 0x00, 0x00}};
277 int err;
278
279 pixclock = (pixclock * mul) / div;
280 best = vgaclocks;
281 err = pixclock - best->pixclock;
282 if (err < 0) err = -err;
283 for (ptr = vgaclocks + 1; ptr->pixclock; ptr++) {
284 int tmp;
285
286 tmp = pixclock - ptr->pixclock;
287 if (tmp < 0) tmp = -tmp;
288 if (tmp < err) {
289 err = tmp;
290 best = ptr;
291 }
292 }
293 par->misc |= best->misc;
294 par->clkdiv = best->seq_clock_mode;
295 pixclock = (best->pixclock * div) / mul;
296 }
297
298 #define FAIL(X) return -EINVAL
299
300 static int vga16fb_open(struct fb_info *info, int user)
301 {
302 struct vga16fb_par *par = info->par;
303 int cnt = atomic_read(&par->ref_count);
304
305 if (!cnt) {
306 memset(&par->state, 0, sizeof(struct vgastate));
307 par->state.flags = VGA_SAVE_FONTS | VGA_SAVE_MODE |
308 VGA_SAVE_CMAP;
309 save_vga(&par->state);
310 }
311 atomic_inc(&par->ref_count);
312 return 0;
313 }
314
315 static int vga16fb_release(struct fb_info *info, int user)
316 {
317 struct vga16fb_par *par = info->par;
318 int cnt = atomic_read(&par->ref_count);
319
320 if (!cnt)
321 return -EINVAL;
322 if (cnt == 1)
323 restore_vga(&par->state);
324 atomic_dec(&par->ref_count);
325
326 return 0;
327 }
328
329 static int vga16fb_check_var(struct fb_var_screeninfo *var,
330 struct fb_info *info)
331 {
332 struct vga16fb_par *par = info->par;
333 u32 xres, right, hslen, left, xtotal;
334 u32 yres, lower, vslen, upper, ytotal;
335 u32 vxres, xoffset, vyres, yoffset;
336 u32 pos;
337 u8 r7, rMode;
338 int shift;
339 int mode;
340 u32 maxmem;
341
342 par->pel_msk = 0xFF;
343
344 if (var->bits_per_pixel == 4) {
345 if (var->nonstd) {
346 if (!par->isVGA)
347 return -EINVAL;
348 shift = 3;
349 mode = MODE_SKIP4 | MODE_CFB;
350 maxmem = 16384;
351 par->pel_msk = 0x0F;
352 } else {
353 shift = 3;
354 mode = 0;
355 maxmem = 65536;
356 }
357 } else if (var->bits_per_pixel == 8) {
358 if (!par->isVGA)
359 return -EINVAL; /* no support on EGA */
360 shift = 2;
361 if (var->nonstd) {
362 mode = MODE_8BPP | MODE_CFB;
363 maxmem = 65536;
364 } else {
365 mode = MODE_SKIP4 | MODE_8BPP | MODE_CFB;
366 maxmem = 16384;
367 }
368 } else
369 return -EINVAL;
370
371 xres = (var->xres + 7) & ~7;
372 vxres = (var->xres_virtual + 0xF) & ~0xF;
373 xoffset = (var->xoffset + 7) & ~7;
374 left = (var->left_margin + 7) & ~7;
375 right = (var->right_margin + 7) & ~7;
376 hslen = (var->hsync_len + 7) & ~7;
377
378 if (vxres < xres)
379 vxres = xres;
380 if (xres + xoffset > vxres)
381 xoffset = vxres - xres;
382
383 var->xres = xres;
384 var->right_margin = right;
385 var->hsync_len = hslen;
386 var->left_margin = left;
387 var->xres_virtual = vxres;
388 var->xoffset = xoffset;
389
390 xres >>= shift;
391 right >>= shift;
392 hslen >>= shift;
393 left >>= shift;
394 vxres >>= shift;
395 xtotal = xres + right + hslen + left;
396 if (xtotal >= 256)
397 FAIL("xtotal too big");
398 if (hslen > 32)
399 FAIL("hslen too big");
400 if (right + hslen + left > 64)
401 FAIL("hblank too big");
402 par->crtc[VGA_CRTC_H_TOTAL] = xtotal - 5;
403 par->crtc[VGA_CRTC_H_BLANK_START] = xres - 1;
404 par->crtc[VGA_CRTC_H_DISP] = xres - 1;
405 pos = xres + right;
406 par->crtc[VGA_CRTC_H_SYNC_START] = pos;
407 pos += hslen;
408 par->crtc[VGA_CRTC_H_SYNC_END] = pos & 0x1F;
409 pos += left - 2; /* blank_end + 2 <= total + 5 */
410 par->crtc[VGA_CRTC_H_BLANK_END] = (pos & 0x1F) | 0x80;
411 if (pos & 0x20)
412 par->crtc[VGA_CRTC_H_SYNC_END] |= 0x80;
413
414 yres = var->yres;
415 lower = var->lower_margin;
416 vslen = var->vsync_len;
417 upper = var->upper_margin;
418 vyres = var->yres_virtual;
419 yoffset = var->yoffset;
420
421 if (yres > vyres)
422 vyres = yres;
423 if (vxres * vyres > maxmem) {
424 vyres = maxmem / vxres;
425 if (vyres < yres)
426 return -ENOMEM;
427 }
428 if (yoffset + yres > vyres)
429 yoffset = vyres - yres;
430 var->yres = yres;
431 var->lower_margin = lower;
432 var->vsync_len = vslen;
433 var->upper_margin = upper;
434 var->yres_virtual = vyres;
435 var->yoffset = yoffset;
436
437 if (var->vmode & FB_VMODE_DOUBLE) {
438 yres <<= 1;
439 lower <<= 1;
440 vslen <<= 1;
441 upper <<= 1;
442 }
443 ytotal = yres + lower + vslen + upper;
444 if (ytotal > 1024) {
445 ytotal >>= 1;
446 yres >>= 1;
447 lower >>= 1;
448 vslen >>= 1;
449 upper >>= 1;
450 rMode = 0x04;
451 } else
452 rMode = 0x00;
453 if (ytotal > 1024)
454 FAIL("ytotal too big");
455 if (vslen > 16)
456 FAIL("vslen too big");
457 par->crtc[VGA_CRTC_V_TOTAL] = ytotal - 2;
458 r7 = 0x10; /* disable linecompare */
459 if (ytotal & 0x100) r7 |= 0x01;
460 if (ytotal & 0x200) r7 |= 0x20;
461 par->crtc[VGA_CRTC_PRESET_ROW] = 0;
462 par->crtc[VGA_CRTC_MAX_SCAN] = 0x40; /* 1 scanline, no linecmp */
463 if (var->vmode & FB_VMODE_DOUBLE)
464 par->crtc[VGA_CRTC_MAX_SCAN] |= 0x80;
465 par->crtc[VGA_CRTC_CURSOR_START] = 0x20;
466 par->crtc[VGA_CRTC_CURSOR_END] = 0x00;
467 if ((mode & (MODE_CFB | MODE_8BPP)) == MODE_CFB)
468 xoffset--;
469 pos = yoffset * vxres + (xoffset >> shift);
470 par->crtc[VGA_CRTC_START_HI] = pos >> 8;
471 par->crtc[VGA_CRTC_START_LO] = pos & 0xFF;
472 par->crtc[VGA_CRTC_CURSOR_HI] = 0x00;
473 par->crtc[VGA_CRTC_CURSOR_LO] = 0x00;
474 pos = yres - 1;
475 par->crtc[VGA_CRTC_V_DISP_END] = pos & 0xFF;
476 par->crtc[VGA_CRTC_V_BLANK_START] = pos & 0xFF;
477 if (pos & 0x100)
478 r7 |= 0x0A; /* 0x02 -> DISP_END, 0x08 -> BLANK_START */
479 if (pos & 0x200) {
480 r7 |= 0x40; /* 0x40 -> DISP_END */
481 par->crtc[VGA_CRTC_MAX_SCAN] |= 0x20; /* BLANK_START */
482 }
483 pos += lower;
484 par->crtc[VGA_CRTC_V_SYNC_START] = pos & 0xFF;
485 if (pos & 0x100)
486 r7 |= 0x04;
487 if (pos & 0x200)
488 r7 |= 0x80;
489 pos += vslen;
490 par->crtc[VGA_CRTC_V_SYNC_END] = (pos & 0x0F) & ~0x10; /* disabled IRQ */
491 pos += upper - 1; /* blank_end + 1 <= ytotal + 2 */
492 par->crtc[VGA_CRTC_V_BLANK_END] = pos & 0xFF; /* 0x7F for original VGA,
493 but some SVGA chips requires all 8 bits to set */
494 if (vxres >= 512)
495 FAIL("vxres too long");
496 par->crtc[VGA_CRTC_OFFSET] = vxres >> 1;
497 if (mode & MODE_SKIP4)
498 par->crtc[VGA_CRTC_UNDERLINE] = 0x5F; /* 256, cfb8 */
499 else
500 par->crtc[VGA_CRTC_UNDERLINE] = 0x1F; /* 16, vgap */
501 par->crtc[VGA_CRTC_MODE] = rMode | ((mode & MODE_TEXT) ? 0xA3 : 0xE3);
502 par->crtc[VGA_CRTC_LINE_COMPARE] = 0xFF;
503 par->crtc[VGA_CRTC_OVERFLOW] = r7;
504
505 par->vss = 0x00; /* 3DA */
506
507 par->misc = 0xE3; /* enable CPU, ports 0x3Dx, positive sync */
508 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
509 par->misc &= ~0x40;
510 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
511 par->misc &= ~0x80;
512
513 par->mode = mode;
514
515 if (mode & MODE_8BPP)
516 /* pixel clock == vga clock / 2 */
517 vga16fb_clock_chip(par, var->pixclock, info, 1, 2);
518 else
519 /* pixel clock == vga clock */
520 vga16fb_clock_chip(par, var->pixclock, info, 1, 1);
521
522 var->red.offset = var->green.offset = var->blue.offset =
523 var->transp.offset = 0;
524 var->red.length = var->green.length = var->blue.length =
525 (par->isVGA) ? 6 : 2;
526 var->transp.length = 0;
527 var->activate = FB_ACTIVATE_NOW;
528 var->height = -1;
529 var->width = -1;
530 var->accel_flags = 0;
531 return 0;
532 }
533 #undef FAIL
534
535 static int vga16fb_set_par(struct fb_info *info)
536 {
537 struct vga16fb_par *par = info->par;
538 u8 gdc[VGA_GFX_C];
539 u8 seq[VGA_SEQ_C];
540 u8 atc[VGA_ATT_C];
541 int fh, i;
542
543 seq[VGA_SEQ_CLOCK_MODE] = 0x01 | par->clkdiv;
544 if (par->mode & MODE_TEXT)
545 seq[VGA_SEQ_PLANE_WRITE] = 0x03;
546 else
547 seq[VGA_SEQ_PLANE_WRITE] = 0x0F;
548 seq[VGA_SEQ_CHARACTER_MAP] = 0x00;
549 if (par->mode & MODE_TEXT)
550 seq[VGA_SEQ_MEMORY_MODE] = 0x03;
551 else if (par->mode & MODE_SKIP4)
552 seq[VGA_SEQ_MEMORY_MODE] = 0x0E;
553 else
554 seq[VGA_SEQ_MEMORY_MODE] = 0x06;
555
556 gdc[VGA_GFX_SR_VALUE] = 0x00;
557 gdc[VGA_GFX_SR_ENABLE] = 0x00;
558 gdc[VGA_GFX_COMPARE_VALUE] = 0x00;
559 gdc[VGA_GFX_DATA_ROTATE] = 0x00;
560 gdc[VGA_GFX_PLANE_READ] = 0;
561 if (par->mode & MODE_TEXT) {
562 gdc[VGA_GFX_MODE] = 0x10;
563 gdc[VGA_GFX_MISC] = 0x06;
564 } else {
565 if (par->mode & MODE_CFB)
566 gdc[VGA_GFX_MODE] = 0x40;
567 else
568 gdc[VGA_GFX_MODE] = 0x00;
569 gdc[VGA_GFX_MISC] = 0x05;
570 }
571 gdc[VGA_GFX_COMPARE_MASK] = 0x0F;
572 gdc[VGA_GFX_BIT_MASK] = 0xFF;
573
574 for (i = 0x00; i < 0x10; i++)
575 atc[i] = i;
576 if (par->mode & MODE_TEXT)
577 atc[VGA_ATC_MODE] = 0x04;
578 else if (par->mode & MODE_8BPP)
579 atc[VGA_ATC_MODE] = 0x41;
580 else
581 atc[VGA_ATC_MODE] = 0x81;
582 atc[VGA_ATC_OVERSCAN] = 0x00; /* 0 for EGA, 0xFF for VGA */
583 atc[VGA_ATC_PLANE_ENABLE] = 0x0F;
584 if (par->mode & MODE_8BPP)
585 atc[VGA_ATC_PEL] = (info->var.xoffset & 3) << 1;
586 else
587 atc[VGA_ATC_PEL] = info->var.xoffset & 7;
588 atc[VGA_ATC_COLOR_PAGE] = 0x00;
589
590 if (par->mode & MODE_TEXT) {
591 fh = 16; // FIXME !!! Fudge font height.
592 par->crtc[VGA_CRTC_MAX_SCAN] = (par->crtc[VGA_CRTC_MAX_SCAN]
593 & ~0x1F) | (fh - 1);
594 }
595
596 vga_io_w(VGA_MIS_W, vga_io_r(VGA_MIS_R) | 0x01);
597
598 /* Enable graphics register modification */
599 if (!par->isVGA) {
600 vga_io_w(EGA_GFX_E0, 0x00);
601 vga_io_w(EGA_GFX_E1, 0x01);
602 }
603
604 /* update misc output register */
605 vga_io_w(VGA_MIS_W, par->misc);
606
607 /* synchronous reset on */
608 vga_io_wseq(0x00, 0x01);
609
610 if (par->isVGA)
611 vga_io_w(VGA_PEL_MSK, par->pel_msk);
612
613 /* write sequencer registers */
614 vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE] | 0x20);
615 for (i = 2; i < VGA_SEQ_C; i++) {
616 vga_io_wseq(i, seq[i]);
617 }
618
619 /* synchronous reset off */
620 vga_io_wseq(0x00, 0x03);
621
622 /* deprotect CRT registers 0-7 */
623 vga_io_wcrt(VGA_CRTC_V_SYNC_END, par->crtc[VGA_CRTC_V_SYNC_END]);
624
625 /* write CRT registers */
626 for (i = 0; i < VGA_CRTC_REGS; i++) {
627 vga_io_wcrt(i, par->crtc[i]);
628 }
629
630 /* write graphics controller registers */
631 for (i = 0; i < VGA_GFX_C; i++) {
632 vga_io_wgfx(i, gdc[i]);
633 }
634
635 /* write attribute controller registers */
636 for (i = 0; i < VGA_ATT_C; i++) {
637 vga_io_r(VGA_IS1_RC); /* reset flip-flop */
638 vga_io_wattr(i, atc[i]);
639 }
640
641 /* Wait for screen to stabilize. */
642 mdelay(50);
643
644 vga_io_wseq(VGA_SEQ_CLOCK_MODE, seq[VGA_SEQ_CLOCK_MODE]);
645
646 vga_io_r(VGA_IS1_RC);
647 vga_io_w(VGA_ATT_IW, 0x20);
648
649 vga16fb_update_fix(info);
650 return 0;
651 }
652
653 static void ega16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
654 {
655 static const unsigned char map[] = { 000, 001, 010, 011 };
656 int val;
657
658 if (regno >= 16)
659 return;
660 val = map[red>>14] | ((map[green>>14]) << 1) | ((map[blue>>14]) << 2);
661 vga_io_r(VGA_IS1_RC); /* ! 0x3BA */
662 vga_io_wattr(regno, val);
663 vga_io_r(VGA_IS1_RC); /* some clones need it */
664 vga_io_w(VGA_ATT_IW, 0x20); /* unblank screen */
665 }
666
667 static void vga16_setpalette(int regno, unsigned red, unsigned green, unsigned blue)
668 {
669 outb(regno, dac_reg);
670 outb(red >> 10, dac_val);
671 outb(green >> 10, dac_val);
672 outb(blue >> 10, dac_val);
673 }
674
675 static int vga16fb_setcolreg(unsigned regno, unsigned red, unsigned green,
676 unsigned blue, unsigned transp,
677 struct fb_info *info)
678 {
679 struct vga16fb_par *par = info->par;
680 int gray;
681
682 /*
683 * Set a single color register. The values supplied are
684 * already rounded down to the hardware's capabilities
685 * (according to the entries in the `var' structure). Return
686 * != 0 for invalid regno.
687 */
688
689 if (regno >= 256)
690 return 1;
691
692 gray = info->var.grayscale;
693
694 if (gray) {
695 /* gray = 0.30*R + 0.59*G + 0.11*B */
696 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
697 }
698 if (par->isVGA)
699 vga16_setpalette(regno,red,green,blue);
700 else
701 ega16_setpalette(regno,red,green,blue);
702 return 0;
703 }
704
705 static int vga16fb_pan_display(struct fb_var_screeninfo *var,
706 struct fb_info *info)
707 {
708 vga16fb_pan_var(info, var);
709 return 0;
710 }
711
712 /* The following VESA blanking code is taken from vgacon.c. The VGA
713 blanking code was originally by Huang shi chao, and modified by
714 Christoph Rimek (chrimek@toppoint.de) and todd j. derr
715 (tjd@barefoot.org) for Linux. */
716 #define attrib_port VGA_ATC_IW
717 #define seq_port_reg VGA_SEQ_I
718 #define seq_port_val VGA_SEQ_D
719 #define gr_port_reg VGA_GFX_I
720 #define gr_port_val VGA_GFX_D
721 #define video_misc_rd VGA_MIS_R
722 #define video_misc_wr VGA_MIS_W
723 #define vga_video_port_reg VGA_CRT_IC
724 #define vga_video_port_val VGA_CRT_DC
725
726 static void vga_vesa_blank(struct vga16fb_par *par, int mode)
727 {
728 unsigned char SeqCtrlIndex;
729 unsigned char CrtCtrlIndex;
730
731 //cli();
732 SeqCtrlIndex = vga_io_r(seq_port_reg);
733 CrtCtrlIndex = vga_io_r(vga_video_port_reg);
734
735 /* save original values of VGA controller registers */
736 if(!par->vesa_blanked) {
737 par->vga_state.CrtMiscIO = vga_io_r(video_misc_rd);
738 //sti();
739
740 par->vga_state.HorizontalTotal = vga_io_rcrt(0x00); /* HorizontalTotal */
741 par->vga_state.HorizDisplayEnd = vga_io_rcrt(0x01); /* HorizDisplayEnd */
742 par->vga_state.StartHorizRetrace = vga_io_rcrt(0x04); /* StartHorizRetrace */
743 par->vga_state.EndHorizRetrace = vga_io_rcrt(0x05); /* EndHorizRetrace */
744 par->vga_state.Overflow = vga_io_rcrt(0x07); /* Overflow */
745 par->vga_state.StartVertRetrace = vga_io_rcrt(0x10); /* StartVertRetrace */
746 par->vga_state.EndVertRetrace = vga_io_rcrt(0x11); /* EndVertRetrace */
747 par->vga_state.ModeControl = vga_io_rcrt(0x17); /* ModeControl */
748 par->vga_state.ClockingMode = vga_io_rseq(0x01); /* ClockingMode */
749 }
750
751 /* assure that video is enabled */
752 /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
753 //cli();
754 vga_io_wseq(0x01, par->vga_state.ClockingMode | 0x20);
755
756 /* test for vertical retrace in process.... */
757 if ((par->vga_state.CrtMiscIO & 0x80) == 0x80)
758 vga_io_w(video_misc_wr, par->vga_state.CrtMiscIO & 0xef);
759
760 /*
761 * Set <End of vertical retrace> to minimum (0) and
762 * <Start of vertical Retrace> to maximum (incl. overflow)
763 * Result: turn off vertical sync (VSync) pulse.
764 */
765 if (mode & FB_BLANK_VSYNC_SUSPEND) {
766 outb_p(0x10,vga_video_port_reg); /* StartVertRetrace */
767 outb_p(0xff,vga_video_port_val); /* maximum value */
768 outb_p(0x11,vga_video_port_reg); /* EndVertRetrace */
769 outb_p(0x40,vga_video_port_val); /* minimum (bits 0..3) */
770 outb_p(0x07,vga_video_port_reg); /* Overflow */
771 outb_p(par->vga_state.Overflow | 0x84,vga_video_port_val); /* bits 9,10 of vert. retrace */
772 }
773
774 if (mode & FB_BLANK_HSYNC_SUSPEND) {
775 /*
776 * Set <End of horizontal retrace> to minimum (0) and
777 * <Start of horizontal Retrace> to maximum
778 * Result: turn off horizontal sync (HSync) pulse.
779 */
780 outb_p(0x04,vga_video_port_reg); /* StartHorizRetrace */
781 outb_p(0xff,vga_video_port_val); /* maximum */
782 outb_p(0x05,vga_video_port_reg); /* EndHorizRetrace */
783 outb_p(0x00,vga_video_port_val); /* minimum (0) */
784 }
785
786 /* restore both index registers */
787 outb_p(SeqCtrlIndex,seq_port_reg);
788 outb_p(CrtCtrlIndex,vga_video_port_reg);
789 //sti();
790 }
791
792 static void vga_vesa_unblank(struct vga16fb_par *par)
793 {
794 unsigned char SeqCtrlIndex;
795 unsigned char CrtCtrlIndex;
796
797 //cli();
798 SeqCtrlIndex = vga_io_r(seq_port_reg);
799 CrtCtrlIndex = vga_io_r(vga_video_port_reg);
800
801 /* restore original values of VGA controller registers */
802 vga_io_w(video_misc_wr, par->vga_state.CrtMiscIO);
803
804 /* HorizontalTotal */
805 vga_io_wcrt(0x00, par->vga_state.HorizontalTotal);
806 /* HorizDisplayEnd */
807 vga_io_wcrt(0x01, par->vga_state.HorizDisplayEnd);
808 /* StartHorizRetrace */
809 vga_io_wcrt(0x04, par->vga_state.StartHorizRetrace);
810 /* EndHorizRetrace */
811 vga_io_wcrt(0x05, par->vga_state.EndHorizRetrace);
812 /* Overflow */
813 vga_io_wcrt(0x07, par->vga_state.Overflow);
814 /* StartVertRetrace */
815 vga_io_wcrt(0x10, par->vga_state.StartVertRetrace);
816 /* EndVertRetrace */
817 vga_io_wcrt(0x11, par->vga_state.EndVertRetrace);
818 /* ModeControl */
819 vga_io_wcrt(0x17, par->vga_state.ModeControl);
820 /* ClockingMode */
821 vga_io_wseq(0x01, par->vga_state.ClockingMode);
822
823 /* restore index/control registers */
824 vga_io_w(seq_port_reg, SeqCtrlIndex);
825 vga_io_w(vga_video_port_reg, CrtCtrlIndex);
826 //sti();
827 }
828
829 static void vga_pal_blank(void)
830 {
831 int i;
832
833 for (i=0; i<16; i++) {
834 outb_p (i, dac_reg) ;
835 outb_p (0, dac_val) ;
836 outb_p (0, dac_val) ;
837 outb_p (0, dac_val) ;
838 }
839 }
840
841 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
842 static int vga16fb_blank(int blank, struct fb_info *info)
843 {
844 struct vga16fb_par *par = info->par;
845
846 switch (blank) {
847 case FB_BLANK_UNBLANK: /* Unblank */
848 if (par->vesa_blanked) {
849 vga_vesa_unblank(par);
850 par->vesa_blanked = 0;
851 }
852 if (par->palette_blanked) {
853 par->palette_blanked = 0;
854 }
855 break;
856 case FB_BLANK_NORMAL: /* blank */
857 vga_pal_blank();
858 par->palette_blanked = 1;
859 break;
860 default: /* VESA blanking */
861 vga_vesa_blank(par, blank);
862 par->vesa_blanked = 1;
863 break;
864 }
865 return 0;
866 }
867
868 static void vga_8planes_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
869 {
870 u32 dx = rect->dx, width = rect->width;
871 char oldindex = getindex();
872 char oldmode = setmode(0x40);
873 char oldmask = selectmask();
874 int line_ofs, height;
875 char oldop, oldsr;
876 char __iomem *where;
877
878 dx /= 4;
879 where = info->screen_base + dx + rect->dy * info->fix.line_length;
880
881 if (rect->rop == ROP_COPY) {
882 oldop = setop(0);
883 oldsr = setsr(0);
884
885 width /= 4;
886 line_ofs = info->fix.line_length - width;
887 setmask(0xff);
888
889 height = rect->height;
890
891 while (height--) {
892 int x;
893
894 /* we can do memset... */
895 for (x = width; x > 0; --x) {
896 writeb(rect->color, where);
897 where++;
898 }
899 where += line_ofs;
900 }
901 } else {
902 char oldcolor = setcolor(0xf);
903 int y;
904
905 oldop = setop(0x18);
906 oldsr = setsr(0xf);
907 setmask(0x0F);
908 for (y = 0; y < rect->height; y++) {
909 rmw(where);
910 rmw(where+1);
911 where += info->fix.line_length;
912 }
913 setcolor(oldcolor);
914 }
915 setmask(oldmask);
916 setsr(oldsr);
917 setop(oldop);
918 setmode(oldmode);
919 setindex(oldindex);
920 }
921
922 static void vga16fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
923 {
924 int x, x2, y2, vxres, vyres, width, height, line_ofs;
925 char __iomem *dst;
926
927 vxres = info->var.xres_virtual;
928 vyres = info->var.yres_virtual;
929
930 if (!rect->width || !rect->height || rect->dx > vxres || rect->dy > vyres)
931 return;
932
933 /* We could use hardware clipping but on many cards you get around
934 * hardware clipping by writing to framebuffer directly. */
935
936 x2 = rect->dx + rect->width;
937 y2 = rect->dy + rect->height;
938 x2 = x2 < vxres ? x2 : vxres;
939 y2 = y2 < vyres ? y2 : vyres;
940 width = x2 - rect->dx;
941
942 switch (info->fix.type) {
943 case FB_TYPE_VGA_PLANES:
944 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
945
946 height = y2 - rect->dy;
947 width = rect->width/8;
948
949 line_ofs = info->fix.line_length - width;
950 dst = info->screen_base + (rect->dx/8) + rect->dy * info->fix.line_length;
951
952 switch (rect->rop) {
953 case ROP_COPY:
954 setmode(0);
955 setop(0);
956 setsr(0xf);
957 setcolor(rect->color);
958 selectmask();
959
960 setmask(0xff);
961
962 while (height--) {
963 for (x = 0; x < width; x++) {
964 writeb(0, dst);
965 dst++;
966 }
967 dst += line_ofs;
968 }
969 break;
970 case ROP_XOR:
971 setmode(0);
972 setop(0x18);
973 setsr(0xf);
974 setcolor(0xf);
975 selectmask();
976
977 setmask(0xff);
978 while (height--) {
979 for (x = 0; x < width; x++) {
980 rmw(dst);
981 dst++;
982 }
983 dst += line_ofs;
984 }
985 break;
986 }
987 } else
988 vga_8planes_fillrect(info, rect);
989 break;
990 case FB_TYPE_PACKED_PIXELS:
991 default:
992 cfb_fillrect(info, rect);
993 break;
994 }
995 }
996
997 static void vga_8planes_copyarea(struct fb_info *info, const struct fb_copyarea *area)
998 {
999 char oldindex = getindex();
1000 char oldmode = setmode(0x41);
1001 char oldop = setop(0);
1002 char oldsr = setsr(0xf);
1003 int height, line_ofs, x;
1004 u32 sx, dx, width;
1005 char __iomem *dest;
1006 char __iomem *src;
1007
1008 height = area->height;
1009
1010 sx = area->sx / 4;
1011 dx = area->dx / 4;
1012 width = area->width / 4;
1013
1014 if (area->dy < area->sy || (area->dy == area->sy && dx < sx)) {
1015 line_ofs = info->fix.line_length - width;
1016 dest = info->screen_base + dx + area->dy * info->fix.line_length;
1017 src = info->screen_base + sx + area->sy * info->fix.line_length;
1018 while (height--) {
1019 for (x = 0; x < width; x++) {
1020 readb(src);
1021 writeb(0, dest);
1022 src++;
1023 dest++;
1024 }
1025 src += line_ofs;
1026 dest += line_ofs;
1027 }
1028 } else {
1029 line_ofs = info->fix.line_length - width;
1030 dest = info->screen_base + dx + width +
1031 (area->dy + height - 1) * info->fix.line_length;
1032 src = info->screen_base + sx + width +
1033 (area->sy + height - 1) * info->fix.line_length;
1034 while (height--) {
1035 for (x = 0; x < width; x++) {
1036 --src;
1037 --dest;
1038 readb(src);
1039 writeb(0, dest);
1040 }
1041 src -= line_ofs;
1042 dest -= line_ofs;
1043 }
1044 }
1045
1046 setsr(oldsr);
1047 setop(oldop);
1048 setmode(oldmode);
1049 setindex(oldindex);
1050 }
1051
1052 static void vga16fb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
1053 {
1054 u32 dx = area->dx, dy = area->dy, sx = area->sx, sy = area->sy;
1055 int x, x2, y2, old_dx, old_dy, vxres, vyres;
1056 int height, width, line_ofs;
1057 char __iomem *dst = NULL;
1058 char __iomem *src = NULL;
1059
1060 vxres = info->var.xres_virtual;
1061 vyres = info->var.yres_virtual;
1062
1063 if (area->dx > vxres || area->sx > vxres || area->dy > vyres ||
1064 area->sy > vyres)
1065 return;
1066
1067 /* clip the destination */
1068 old_dx = area->dx;
1069 old_dy = area->dy;
1070
1071 /*
1072 * We could use hardware clipping but on many cards you get around
1073 * hardware clipping by writing to framebuffer directly.
1074 */
1075 x2 = area->dx + area->width;
1076 y2 = area->dy + area->height;
1077 dx = area->dx > 0 ? area->dx : 0;
1078 dy = area->dy > 0 ? area->dy : 0;
1079 x2 = x2 < vxres ? x2 : vxres;
1080 y2 = y2 < vyres ? y2 : vyres;
1081 width = x2 - dx;
1082 height = y2 - dy;
1083
1084 /* update sx1,sy1 */
1085 sx += (dx - old_dx);
1086 sy += (dy - old_dy);
1087
1088 /* the source must be completely inside the virtual screen */
1089 if (sx < 0 || sy < 0 || (sx + width) > vxres || (sy + height) > vyres)
1090 return;
1091
1092 switch (info->fix.type) {
1093 case FB_TYPE_VGA_PLANES:
1094 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
1095 width = width/8;
1096 height = height;
1097 line_ofs = info->fix.line_length - width;
1098
1099 setmode(1);
1100 setop(0);
1101 setsr(0xf);
1102
1103 if (dy < sy || (dy == sy && dx < sx)) {
1104 dst = info->screen_base + (dx/8) + dy * info->fix.line_length;
1105 src = info->screen_base + (sx/8) + sy * info->fix.line_length;
1106 while (height--) {
1107 for (x = 0; x < width; x++) {
1108 readb(src);
1109 writeb(0, dst);
1110 dst++;
1111 src++;
1112 }
1113 src += line_ofs;
1114 dst += line_ofs;
1115 }
1116 } else {
1117 dst = info->screen_base + (dx/8) + width +
1118 (dy + height - 1) * info->fix.line_length;
1119 src = info->screen_base + (sx/8) + width +
1120 (sy + height - 1) * info->fix.line_length;
1121 while (height--) {
1122 for (x = 0; x < width; x++) {
1123 dst--;
1124 src--;
1125 readb(src);
1126 writeb(0, dst);
1127 }
1128 src -= line_ofs;
1129 dst -= line_ofs;
1130 }
1131 }
1132 } else
1133 vga_8planes_copyarea(info, area);
1134 break;
1135 case FB_TYPE_PACKED_PIXELS:
1136 default:
1137 cfb_copyarea(info, area);
1138 break;
1139 }
1140 }
1141
1142 #define TRANS_MASK_LOW {0x0,0x8,0x4,0xC,0x2,0xA,0x6,0xE,0x1,0x9,0x5,0xD,0x3,0xB,0x7,0xF}
1143 #define TRANS_MASK_HIGH {0x000, 0x800, 0x400, 0xC00, 0x200, 0xA00, 0x600, 0xE00, \
1144 0x100, 0x900, 0x500, 0xD00, 0x300, 0xB00, 0x700, 0xF00}
1145
1146 #if defined(__LITTLE_ENDIAN)
1147 static const u16 transl_l[] = TRANS_MASK_LOW;
1148 static const u16 transl_h[] = TRANS_MASK_HIGH;
1149 #elif defined(__BIG_ENDIAN)
1150 static const u16 transl_l[] = TRANS_MASK_HIGH;
1151 static const u16 transl_h[] = TRANS_MASK_LOW;
1152 #else
1153 #error "Only __BIG_ENDIAN and __LITTLE_ENDIAN are supported in vga-planes"
1154 #endif
1155
1156 static void vga_8planes_imageblit(struct fb_info *info, const struct fb_image *image)
1157 {
1158 char oldindex = getindex();
1159 char oldmode = setmode(0x40);
1160 char oldop = setop(0);
1161 char oldsr = setsr(0);
1162 char oldmask = selectmask();
1163 const char *cdat = image->data;
1164 u32 dx = image->dx;
1165 char __iomem *where;
1166 int y;
1167
1168 dx /= 4;
1169 where = info->screen_base + dx + image->dy * info->fix.line_length;
1170
1171 setmask(0xff);
1172 writeb(image->bg_color, where);
1173 readb(where);
1174 selectmask();
1175 setmask(image->fg_color ^ image->bg_color);
1176 setmode(0x42);
1177 setop(0x18);
1178 for (y = 0; y < image->height; y++, where += info->fix.line_length)
1179 writew(transl_h[cdat[y]&0xF] | transl_l[cdat[y] >> 4], where);
1180 setmask(oldmask);
1181 setsr(oldsr);
1182 setop(oldop);
1183 setmode(oldmode);
1184 setindex(oldindex);
1185 }
1186
1187 static void vga_imageblit_expand(struct fb_info *info, const struct fb_image *image)
1188 {
1189 char __iomem *where = info->screen_base + (image->dx/8) +
1190 image->dy * info->fix.line_length;
1191 struct vga16fb_par *par = info->par;
1192 char *cdat = (char *) image->data;
1193 char __iomem *dst;
1194 int x, y;
1195
1196 switch (info->fix.type) {
1197 case FB_TYPE_VGA_PLANES:
1198 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4) {
1199 if (par->isVGA) {
1200 setmode(2);
1201 setop(0);
1202 setsr(0xf);
1203 setcolor(image->fg_color);
1204 selectmask();
1205
1206 setmask(0xff);
1207 writeb(image->bg_color, where);
1208 rmb();
1209 readb(where); /* fill latches */
1210 setmode(3);
1211 wmb();
1212 for (y = 0; y < image->height; y++) {
1213 dst = where;
1214 for (x = image->width/8; x--;)
1215 writeb(*cdat++, dst++);
1216 where += info->fix.line_length;
1217 }
1218 wmb();
1219 } else {
1220 setmode(0);
1221 setop(0);
1222 setsr(0xf);
1223 setcolor(image->bg_color);
1224 selectmask();
1225
1226 setmask(0xff);
1227 for (y = 0; y < image->height; y++) {
1228 dst = where;
1229 for (x=image->width/8; x--;){
1230 rmw(dst);
1231 setcolor(image->fg_color);
1232 selectmask();
1233 if (*cdat) {
1234 setmask(*cdat++);
1235 rmw(dst++);
1236 }
1237 }
1238 where += info->fix.line_length;
1239 }
1240 }
1241 } else
1242 vga_8planes_imageblit(info, image);
1243 break;
1244 case FB_TYPE_PACKED_PIXELS:
1245 default:
1246 cfb_imageblit(info, image);
1247 break;
1248 }
1249 }
1250
1251 static void vga_imageblit_color(struct fb_info *info, const struct fb_image *image)
1252 {
1253 /*
1254 * Draw logo
1255 */
1256 struct vga16fb_par *par = info->par;
1257 char __iomem *where =
1258 info->screen_base + image->dy * info->fix.line_length +
1259 image->dx/8;
1260 const char *cdat = image->data;
1261 char __iomem *dst;
1262 int x, y;
1263
1264 switch (info->fix.type) {
1265 case FB_TYPE_VGA_PLANES:
1266 if (info->fix.type_aux == FB_AUX_VGA_PLANES_VGA4 &&
1267 par->isVGA) {
1268 setsr(0xf);
1269 setop(0);
1270 setmode(0);
1271
1272 for (y = 0; y < image->height; y++) {
1273 for (x = 0; x < image->width; x++) {
1274 dst = where + x/8;
1275
1276 setcolor(*cdat);
1277 selectmask();
1278 setmask(1 << (7 - (x % 8)));
1279 fb_readb(dst);
1280 fb_writeb(0, dst);
1281
1282 cdat++;
1283 }
1284 where += info->fix.line_length;
1285 }
1286 }
1287 break;
1288 case FB_TYPE_PACKED_PIXELS:
1289 cfb_imageblit(info, image);
1290 break;
1291 default:
1292 break;
1293 }
1294 }
1295
1296 static void vga16fb_imageblit(struct fb_info *info, const struct fb_image *image)
1297 {
1298 if (image->depth == 1)
1299 vga_imageblit_expand(info, image);
1300 else
1301 vga_imageblit_color(info, image);
1302 }
1303
1304 static struct fb_ops vga16fb_ops = {
1305 .owner = THIS_MODULE,
1306 .fb_open = vga16fb_open,
1307 .fb_release = vga16fb_release,
1308 .fb_check_var = vga16fb_check_var,
1309 .fb_set_par = vga16fb_set_par,
1310 .fb_setcolreg = vga16fb_setcolreg,
1311 .fb_pan_display = vga16fb_pan_display,
1312 .fb_blank = vga16fb_blank,
1313 .fb_fillrect = vga16fb_fillrect,
1314 .fb_copyarea = vga16fb_copyarea,
1315 .fb_imageblit = vga16fb_imageblit,
1316 };
1317
1318 #ifndef MODULE
1319 static int vga16fb_setup(char *options)
1320 {
1321 char *this_opt;
1322
1323 if (!options || !*options)
1324 return 0;
1325
1326 while ((this_opt = strsep(&options, ",")) != NULL) {
1327 if (!*this_opt) continue;
1328 }
1329 return 0;
1330 }
1331 #endif
1332
1333 static int __init vga16fb_probe(struct platform_device *dev)
1334 {
1335 struct fb_info *info;
1336 struct vga16fb_par *par;
1337 int i;
1338 int ret = 0;
1339
1340 printk(KERN_DEBUG "vga16fb: initializing\n");
1341 info = framebuffer_alloc(sizeof(struct vga16fb_par), &dev->dev);
1342
1343 if (!info) {
1344 ret = -ENOMEM;
1345 goto err_fb_alloc;
1346 }
1347
1348 /* XXX share VGA_FB_PHYS and I/O region with vgacon and others */
1349 info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS, 0);
1350
1351 if (!info->screen_base) {
1352 printk(KERN_ERR "vga16fb: unable to map device\n");
1353 ret = -ENOMEM;
1354 goto err_ioremap;
1355 }
1356
1357 printk(KERN_INFO "vga16fb: mapped to 0x%p\n", info->screen_base);
1358 par = info->par;
1359
1360 par->isVGA = ORIG_VIDEO_ISVGA;
1361 par->palette_blanked = 0;
1362 par->vesa_blanked = 0;
1363
1364 i = par->isVGA? 6 : 2;
1365
1366 vga16fb_defined.red.length = i;
1367 vga16fb_defined.green.length = i;
1368 vga16fb_defined.blue.length = i;
1369
1370 /* name should not depend on EGA/VGA */
1371 info->fbops = &vga16fb_ops;
1372 info->var = vga16fb_defined;
1373 info->fix = vga16fb_fix;
1374 info->flags = FBINFO_FLAG_DEFAULT |
1375 FBINFO_HWACCEL_YPAN;
1376
1377 i = (info->var.bits_per_pixel == 8) ? 256 : 16;
1378 ret = fb_alloc_cmap(&info->cmap, i, 0);
1379 if (ret) {
1380 printk(KERN_ERR "vga16fb: unable to allocate colormap\n");
1381 ret = -ENOMEM;
1382 goto err_alloc_cmap;
1383 }
1384
1385 if (vga16fb_check_var(&info->var, info)) {
1386 printk(KERN_ERR "vga16fb: unable to validate variable\n");
1387 ret = -EINVAL;
1388 goto err_check_var;
1389 }
1390
1391 vga16fb_update_fix(info);
1392
1393 if (register_framebuffer(info) < 0) {
1394 printk(KERN_ERR "vga16fb: unable to register framebuffer\n");
1395 ret = -EINVAL;
1396 goto err_check_var;
1397 }
1398
1399 printk(KERN_INFO "fb%d: %s frame buffer device\n",
1400 info->node, info->fix.id);
1401 platform_set_drvdata(dev, info);
1402
1403 return 0;
1404
1405 err_check_var:
1406 fb_dealloc_cmap(&info->cmap);
1407 err_alloc_cmap:
1408 iounmap(info->screen_base);
1409 err_ioremap:
1410 framebuffer_release(info);
1411 err_fb_alloc:
1412 return ret;
1413 }
1414
1415 static int vga16fb_remove(struct platform_device *dev)
1416 {
1417 struct fb_info *info = platform_get_drvdata(dev);
1418
1419 if (info) {
1420 unregister_framebuffer(info);
1421 iounmap(info->screen_base);
1422 fb_dealloc_cmap(&info->cmap);
1423 /* XXX unshare VGA regions */
1424 framebuffer_release(info);
1425 }
1426
1427 return 0;
1428 }
1429
1430 static struct platform_driver vga16fb_driver = {
1431 .probe = vga16fb_probe,
1432 .remove = vga16fb_remove,
1433 .driver = {
1434 .name = "vga16fb",
1435 },
1436 };
1437
1438 static struct platform_device *vga16fb_device;
1439
1440 static int __init vga16fb_init(void)
1441 {
1442 int ret;
1443 #ifndef MODULE
1444 char *option = NULL;
1445
1446 if (fb_get_options("vga16fb", &option))
1447 return -ENODEV;
1448
1449 vga16fb_setup(option);
1450 #endif
1451 ret = platform_driver_register(&vga16fb_driver);
1452
1453 if (!ret) {
1454 vga16fb_device = platform_device_alloc("vga16fb", 0);
1455
1456 if (vga16fb_device)
1457 ret = platform_device_add(vga16fb_device);
1458 else
1459 ret = -ENOMEM;
1460
1461 if (ret) {
1462 platform_device_put(vga16fb_device);
1463 platform_driver_unregister(&vga16fb_driver);
1464 }
1465 }
1466
1467 return ret;
1468 }
1469
1470 static void __exit vga16fb_exit(void)
1471 {
1472 platform_device_unregister(vga16fb_device);
1473 platform_driver_unregister(&vga16fb_driver);
1474 }
1475
1476 MODULE_LICENSE("GPL");
1477 module_init(vga16fb_init);
1478 module_exit(vga16fb_exit);
1479
1480
1481 /*
1482 * Overrides for Emacs so that we follow Linus's tabbing style.
1483 * ---------------------------------------------------------------------------
1484 * Local variables:
1485 * c-basic-offset: 8
1486 * End:
1487 */
1488
Support for the Chinese Samsung S3C2440 based development boards