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kbuild: document howto build external modules using several directories
[linux-2.6/verdex.git] / drivers / video / vgastate.c
blobd9e01daee630dae2283c27bdf559dd93597b5c1a
1 /*
2 * linux/drivers/video/vgastate.c -- VGA state save/restore
3 *
4 * Copyright 2002 James Simmons
5 *
6 * Copyright history from vga16fb.c:
7 * Copyright 1999 Ben Pfaff and Petr Vandrovec
8 * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm
9 * Based on VESA framebuffer (c) 1998 Gerd Knorr
10 *
11 * This file is subject to the terms and conditions of the GNU General
12 * Public License. See the file COPYING in the main directory of this
13 * archive for more details.
14 *
15 */
16 #include <linux/config.h>
17 #include <linux/module.h>
18 #include <linux/slab.h>
19 #include <linux/fb.h>
20 #include <linux/vmalloc.h>
21 #include <video/vga.h>
22
23 struct regstate {
24 __u8 *vga_font0;
25 __u8 *vga_font1;
26 __u8 *vga_text;
27 __u8 *vga_cmap;
28 __u8 *attr;
29 __u8 *crtc;
30 __u8 *gfx;
31 __u8 *seq;
32 __u8 misc;
33 };
34
35 static inline unsigned char vga_rcrtcs(void __iomem *regbase, unsigned short iobase,
36 unsigned char reg)
37 {
38 vga_w(regbase, iobase + 0x4, reg);
39 return vga_r(regbase, iobase + 0x5);
40 }
41
42 static inline void vga_wcrtcs(void __iomem *regbase, unsigned short iobase,
43 unsigned char reg, unsigned char val)
44 {
45 vga_w(regbase, iobase + 0x4, reg);
46 vga_w(regbase, iobase + 0x5, val);
47 }
48
49 static void save_vga_text(struct vgastate *state, void __iomem *fbbase)
50 {
51 struct regstate *saved = (struct regstate *) state->vidstate;
52 int i;
53 u8 misc, attr10, gr4, gr5, gr6, seq1, seq2, seq4;
54
55 /* if in graphics mode, no need to save */
56 attr10 = vga_rattr(state->vgabase, 0x10);
57 if (attr10 & 1)
58 return;
59
60 /* save regs */
61 misc = vga_r(state->vgabase, VGA_MIS_R);
62 gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
63 gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE);
64 gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC);
65 seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
66 seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
67
68 /* force graphics mode */
69 vga_w(state->vgabase, VGA_MIS_W, misc | 1);
70
71 /* blank screen */
72 seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
73 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
74 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5);
75 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
76
77 /* save font at plane 2 */
78 if (state->flags & VGA_SAVE_FONT0) {
79 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4);
80 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
81 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2);
82 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
83 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
84 for (i = 0; i < 4 * 8192; i++)
85 saved->vga_font0[i] = vga_r(fbbase, i);
86 }
87
88 /* save font at plane 3 */
89 if (state->flags & VGA_SAVE_FONT1) {
90 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8);
91 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
92 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3);
93 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
94 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
95 for (i = 0; i < state->memsize; i++)
96 saved->vga_font1[i] = vga_r(fbbase, i);
97 }
98
99 /* save font at plane 0/1 */
100 if (state->flags & VGA_SAVE_TEXT) {
101 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1);
102 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
103 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0);
104 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
105 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
106 for (i = 0; i < 8192; i++)
107 saved->vga_text[i] = vga_r(fbbase, i);
108
109 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2);
110 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
111 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1);
112 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
113 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
114 for (i = 0; i < 8192; i++)
115 saved->vga_text[8192+i] = vga_r(fbbase + 2 * 8192, i);
116 }
117
118 /* restore regs */
119 vga_wattr(state->vgabase, 0x10, attr10);
120
121 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2);
122 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4);
123
124 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
125 vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5);
126 vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6);
127 vga_w(state->vgabase, VGA_MIS_W, misc);
128
129 /* unblank screen */
130 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
131 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5));
132 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
133
134 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1);
135 }
136
137 static void restore_vga_text(struct vgastate *state, void __iomem *fbbase)
138 {
139 struct regstate *saved = (struct regstate *) state->vidstate;
140 int i;
141 u8 misc, gr1, gr3, gr4, gr5, gr6, gr8;
142 u8 seq1, seq2, seq4;
143
144 /* save regs */
145 misc = vga_r(state->vgabase, VGA_MIS_R);
146 gr1 = vga_rgfx(state->vgabase, VGA_GFX_SR_ENABLE);
147 gr3 = vga_rgfx(state->vgabase, VGA_GFX_DATA_ROTATE);
148 gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ);
149 gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE);
150 gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC);
151 gr8 = vga_rgfx(state->vgabase, VGA_GFX_BIT_MASK);
152 seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE);
153 seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE);
154
155 /* force graphics mode */
156 vga_w(state->vgabase, VGA_MIS_W, misc | 1);
157
158 /* blank screen */
159 seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
160 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
161 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5);
162 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
163
164 if (state->depth == 4) {
165 vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, 0x0);
166 vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, 0xff);
167 vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, 0x00);
168 }
169
170 /* restore font at plane 2 */
171 if (state->flags & VGA_SAVE_FONT0) {
172 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4);
173 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
174 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2);
175 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
176 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
177 for (i = 0; i < 4 * 8192; i++)
178 vga_w(fbbase, i, saved->vga_font0[i]);
179 }
180
181 /* restore font at plane 3 */
182 if (state->flags & VGA_SAVE_FONT1) {
183 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8);
184 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
185 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3);
186 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
187 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
188 for (i = 0; i < state->memsize; i++)
189 vga_w(fbbase, i, saved->vga_font1[i]);
190 }
191
192 /* restore font at plane 0/1 */
193 if (state->flags & VGA_SAVE_TEXT) {
194 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1);
195 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
196 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0);
197 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
198 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
199 for (i = 0; i < 8192; i++)
200 vga_w(fbbase, i, saved->vga_text[i]);
201
202 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2);
203 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6);
204 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1);
205 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0);
206 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5);
207 for (i = 0; i < 8192; i++)
208 vga_w(fbbase, i, saved->vga_text[8192+i]);
209 }
210
211 /* unblank screen */
212 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
213 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5));
214 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3);
215
216 /* restore regs */
217 vga_w(state->vgabase, VGA_MIS_W, misc);
218
219 vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, gr1);
220 vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, gr3);
221 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4);
222 vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5);
223 vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6);
224 vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, gr8);
225
226 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1);
227 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2);
228 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4);
229 }
230
231 static void save_vga_mode(struct vgastate *state)
232 {
233 struct regstate *saved = (struct regstate *) state->vidstate;
234 unsigned short iobase;
235 int i;
236
237 saved->misc = vga_r(state->vgabase, VGA_MIS_R);
238 if (saved->misc & 1)
239 iobase = 0x3d0;
240 else
241 iobase = 0x3b0;
242
243 for (i = 0; i < state->num_crtc; i++)
244 saved->crtc[i] = vga_rcrtcs(state->vgabase, iobase, i);
245
246 vga_r(state->vgabase, iobase + 0xa);
247 vga_w(state->vgabase, VGA_ATT_W, 0x00);
248 for (i = 0; i < state->num_attr; i++) {
249 vga_r(state->vgabase, iobase + 0xa);
250 saved->attr[i] = vga_rattr(state->vgabase, i);
251 }
252 vga_r(state->vgabase, iobase + 0xa);
253 vga_w(state->vgabase, VGA_ATT_W, 0x20);
254
255 for (i = 0; i < state->num_gfx; i++)
256 saved->gfx[i] = vga_rgfx(state->vgabase, i);
257
258 for (i = 0; i < state->num_seq; i++)
259 saved->seq[i] = vga_rseq(state->vgabase, i);
260 }
261
262 static void restore_vga_mode(struct vgastate *state)
263 {
264 struct regstate *saved = (struct regstate *) state->vidstate;
265 unsigned short iobase;
266 int i;
267
268 vga_w(state->vgabase, VGA_MIS_W, saved->misc);
269
270 if (saved->misc & 1)
271 iobase = 0x3d0;
272 else
273 iobase = 0x3b0;
274
275 /* turn off display */
276 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE,
277 saved->seq[VGA_SEQ_CLOCK_MODE] | 0x20);
278
279 /* disable sequencer */
280 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);
281
282 /* enable palette addressing */
283 vga_r(state->vgabase, iobase + 0xa);
284 vga_w(state->vgabase, VGA_ATT_W, 0x00);
285
286 for (i = 2; i < state->num_seq; i++)
287 vga_wseq(state->vgabase, i, saved->seq[i]);
288
289
290 /* unprotect vga regs */
291 vga_wcrtcs(state->vgabase, iobase, 17, saved->crtc[17] & ~0x80);
292 for (i = 0; i < state->num_crtc; i++)
293 vga_wcrtcs(state->vgabase, iobase, i, saved->crtc[i]);
294
295 for (i = 0; i < state->num_gfx; i++)
296 vga_wgfx(state->vgabase, i, saved->gfx[i]);
297
298 for (i = 0; i < state->num_attr; i++) {
299 vga_r(state->vgabase, iobase + 0xa);
300 vga_wattr(state->vgabase, i, saved->attr[i]);
301 }
302
303 /* reenable sequencer */
304 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
305 /* turn display on */
306 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE,
307 saved->seq[VGA_SEQ_CLOCK_MODE] & ~(1 << 5));
308
309 /* disable video/palette source */
310 vga_r(state->vgabase, iobase + 0xa);
311 vga_w(state->vgabase, VGA_ATT_W, 0x20);
312 }
313
314 static void save_vga_cmap(struct vgastate *state)
315 {
316 struct regstate *saved = (struct regstate *) state->vidstate;
317 int i;
318
319 vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
320
321 /* assumes DAC is readable and writable */
322 vga_w(state->vgabase, VGA_PEL_IR, 0x00);
323 for (i = 0; i < 768; i++)
324 saved->vga_cmap[i] = vga_r(state->vgabase, VGA_PEL_D);
325 }
326
327 static void restore_vga_cmap(struct vgastate *state)
328 {
329 struct regstate *saved = (struct regstate *) state->vidstate;
330 int i;
331
332 vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
333
334 /* assumes DAC is readable and writable */
335 vga_w(state->vgabase, VGA_PEL_IW, 0x00);
336 for (i = 0; i < 768; i++)
337 vga_w(state->vgabase, VGA_PEL_D, saved->vga_cmap[i]);
338 }
339
340 static void vga_cleanup(struct vgastate *state)
341 {
342 if (state->vidstate != NULL) {
343 struct regstate *saved = (struct regstate *) state->vidstate;
344
345 vfree(saved->vga_font0);
346 vfree(saved->vga_font1);
347 vfree(saved->vga_text);
348 vfree(saved->vga_cmap);
349 vfree(saved->attr);
350 kfree(saved);
351 state->vidstate = NULL;
352 }
353 }
354
355 int save_vga(struct vgastate *state)
356 {
357 struct regstate *saved;
358
359 saved = kmalloc(sizeof(struct regstate), GFP_KERNEL);
360 if (saved == NULL)
361 return 1;
362 memset (saved, 0, sizeof(struct regstate));
363 state->vidstate = (void *)saved;
364
365 if (state->flags & VGA_SAVE_CMAP) {
366 saved->vga_cmap = vmalloc(768);
367 if (!saved->vga_cmap) {
368 vga_cleanup(state);
369 return 1;
370 }
371 save_vga_cmap(state);
372 }
373
374 if (state->flags & VGA_SAVE_MODE) {
375 int total;
376
377 if (state->num_attr < 21)
378 state->num_attr = 21;
379 if (state->num_crtc < 25)
380 state->num_crtc = 25;
381 if (state->num_gfx < 9)
382 state->num_gfx = 9;
383 if (state->num_seq < 5)
384 state->num_seq = 5;
385 total = state->num_attr + state->num_crtc +
386 state->num_gfx + state->num_seq;
387
388 saved->attr = vmalloc(total);
389 if (!saved->attr) {
390 vga_cleanup(state);
391 return 1;
392 }
393 saved->crtc = saved->attr + state->num_attr;
394 saved->gfx = saved->crtc + state->num_crtc;
395 saved->seq = saved->gfx + state->num_gfx;
396
397 save_vga_mode(state);
398 }
399
400 if (state->flags & VGA_SAVE_FONTS) {
401 void __iomem *fbbase;
402
403 /* exit if window is less than 32K */
404 if (state->memsize && state->memsize < 4 * 8192) {
405 vga_cleanup(state);
406 return 1;
407 }
408 if (!state->memsize)
409 state->memsize = 8 * 8192;
410
411 if (!state->membase)
412 state->membase = 0xA0000;
413
414 fbbase = ioremap(state->membase, state->memsize);
415
416 if (!fbbase) {
417 vga_cleanup(state);
418 return 1;
419 }
420
421 /*
422 * save only first 32K used by vgacon
423 */
424 if (state->flags & VGA_SAVE_FONT0) {
425 saved->vga_font0 = vmalloc(4 * 8192);
426 if (!saved->vga_font0) {
427 iounmap(fbbase);
428 vga_cleanup(state);
429 return 1;
430 }
431 }
432 /*
433 * largely unused, but if required by the caller
434 * we'll just save everything.
435 */
436 if (state->flags & VGA_SAVE_FONT1) {
437 saved->vga_font1 = vmalloc(state->memsize);
438 if (!saved->vga_font1) {
439 iounmap(fbbase);
440 vga_cleanup(state);
441 return 1;
442 }
443 }
444 /*
445 * Save 8K at plane0[0], and 8K at plane1[16K]
446 */
447 if (state->flags & VGA_SAVE_TEXT) {
448 saved->vga_text = vmalloc(8192 * 2);
449 if (!saved->vga_text) {
450 iounmap(fbbase);
451 vga_cleanup(state);
452 return 1;
453 }
454 }
455
456 save_vga_text(state, fbbase);
457 iounmap(fbbase);
458 }
459 return 0;
460 }
461
462 int restore_vga (struct vgastate *state)
463 {
464 if (state->vidstate == NULL)
465 return 1;
466
467 if (state->flags & VGA_SAVE_MODE)
468 restore_vga_mode(state);
469
470 if (state->flags & VGA_SAVE_FONTS) {
471 void __iomem *fbbase = ioremap(state->membase, state->memsize);
472
473 if (!fbbase) {
474 vga_cleanup(state);
475 return 1;
476 }
477 restore_vga_text(state, fbbase);
478 iounmap(fbbase);
479 }
480
481 if (state->flags & VGA_SAVE_CMAP)
482 restore_vga_cmap(state);
483
484 vga_cleanup(state);
485 return 0;
486 }
487
488 EXPORT_SYMBOL(save_vga);
489 EXPORT_SYMBOL(restore_vga);
490
491 MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
492 MODULE_DESCRIPTION("VGA State Save/Restore");
493 MODULE_LICENSE("GPL");
494
Verdex Pro support