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-rw-r--r--drivers/video/vgastate.c504
1 files changed, 504 insertions, 0 deletions
diff --git a/drivers/video/vgastate.c b/drivers/video/vgastate.c
new file mode 100644
index 000000000000..0ea62d8bc703
--- /dev/null
+++ b/drivers/video/vgastate.c
@@ -0,0 +1,504 @@
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
23struct 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
35static 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
42static 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
49static 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
137static 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
231static 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
262static 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
314static 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
327static 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
340static void vga_cleanup(struct vgastate *state)
341{
342 if (state->vidstate != NULL) {
343 struct regstate *saved = (struct regstate *) state->vidstate;
344
345 if (saved->vga_font0)
346 vfree(saved->vga_font0);
347 if (saved->vga_font1)
348 vfree(saved->vga_font1);
349 if (saved->vga_text)
350 vfree(saved->vga_text);
351 if (saved->vga_cmap)
352 vfree(saved->vga_cmap);
353 if (saved->attr)
354 vfree(saved->attr);
355 kfree(saved);
356 state->vidstate = NULL;
357 }
358}
359
360int save_vga(struct vgastate *state)
361{
362 struct regstate *saved;
363
364 saved = kmalloc(sizeof(struct regstate), GFP_KERNEL);
365 if (saved == NULL)
366 return 1;
367 memset (saved, 0, sizeof(struct regstate));
368 state->vidstate = (void *)saved;
369
370 if (state->flags & VGA_SAVE_CMAP) {
371 saved->vga_cmap = vmalloc(768);
372 if (!saved->vga_cmap) {
373 vga_cleanup(state);
374 return 1;
375 }
376 save_vga_cmap(state);
377 }
378
379 if (state->flags & VGA_SAVE_MODE) {
380 int total;
381
382 if (state->num_attr < 21)
383 state->num_attr = 21;
384 if (state->num_crtc < 25)
385 state->num_crtc = 25;
386 if (state->num_gfx < 9)
387 state->num_gfx = 9;
388 if (state->num_seq < 5)
389 state->num_seq = 5;
390 total = state->num_attr + state->num_crtc +
391 state->num_gfx + state->num_seq;
392
393 saved->attr = vmalloc(total);
394 if (!saved->attr) {
395 vga_cleanup(state);
396 return 1;
397 }
398 saved->crtc = saved->attr + state->num_attr;
399 saved->gfx = saved->crtc + state->num_crtc;
400 saved->seq = saved->gfx + state->num_gfx;
401
402 save_vga_mode(state);
403 }
404
405 if (state->flags & VGA_SAVE_FONTS) {
406 void __iomem *fbbase;
407
408 /* exit if window is less than 32K */
409 if (state->memsize && state->memsize < 4 * 8192) {
410 vga_cleanup(state);
411 return 1;
412 }
413 if (!state->memsize)
414 state->memsize = 8 * 8192;
415
416 if (!state->membase)
417 state->membase = 0xA0000;
418
419 fbbase = ioremap(state->membase, state->memsize);
420
421 if (!fbbase) {
422 vga_cleanup(state);
423 return 1;
424 }
425
426 /*
427 * save only first 32K used by vgacon
428 */
429 if (state->flags & VGA_SAVE_FONT0) {
430 saved->vga_font0 = vmalloc(4 * 8192);
431 if (!saved->vga_font0) {
432 iounmap(fbbase);
433 vga_cleanup(state);
434 return 1;
435 }
436 }
437 /*
438 * largely unused, but if required by the caller
439 * we'll just save everything.
440 */
441 if (state->flags & VGA_SAVE_FONT1) {
442 saved->vga_font1 = vmalloc(state->memsize);
443 if (!saved->vga_font1) {
444 iounmap(fbbase);
445 vga_cleanup(state);
446 return 1;
447 }
448 }
449 /*
450 * Save 8K at plane0[0], and 8K at plane1[16K]
451 */
452 if (state->flags & VGA_SAVE_TEXT) {
453 saved->vga_text = vmalloc(8192 * 2);
454 if (!saved->vga_text) {
455 iounmap(fbbase);
456 vga_cleanup(state);
457 return 1;
458 }
459 }
460
461 save_vga_text(state, fbbase);
462 iounmap(fbbase);
463 }
464 return 0;
465}
466
467int restore_vga (struct vgastate *state)
468{
469 if (state->vidstate == NULL)
470 return 1;
471
472 if (state->flags & VGA_SAVE_MODE)
473 restore_vga_mode(state);
474
475 if (state->flags & VGA_SAVE_FONTS) {
476 void __iomem *fbbase = ioremap(state->membase, state->memsize);
477
478 if (!fbbase) {
479 vga_cleanup(state);
480 return 1;
481 }
482 restore_vga_text(state, fbbase);
483 iounmap(fbbase);
484 }
485
486 if (state->flags & VGA_SAVE_CMAP)
487 restore_vga_cmap(state);
488
489 vga_cleanup(state);
490 return 0;
491}
492
493#ifdef MODULE
494int init_module(void) { return 0; };
495void cleanup_module(void) {};
496#endif
497
498EXPORT_SYMBOL(save_vga);
499EXPORT_SYMBOL(restore_vga);
500
501MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>");
502MODULE_DESCRIPTION("VGA State Save/Restore");
503MODULE_LICENSE("GPL");
504
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-15 17:36:35 -0500