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path: root/drivers/video/fbdev/vesafb.c
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Diffstat (limited to 'drivers/video/fbdev/vesafb.c')
-rw-r--r--drivers/video/fbdev/vesafb.c522
1 files changed, 522 insertions, 0 deletions
diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
new file mode 100644
index 000000000000..6170e7f58640
--- /dev/null
+++ b/drivers/video/fbdev/vesafb.c
@@ -0,0 +1,522 @@
1/*
2 * framebuffer driver for VBE 2.0 compliant graphic boards
3 *
4 * switching to graphics mode happens at boot time (while
5 * running in real mode, see arch/i386/boot/video.S).
6 *
7 * (c) 1998 Gerd Knorr <kraxel@goldbach.in-berlin.de>
8 *
9 */
10
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/string.h>
15#include <linux/mm.h>
16#include <linux/delay.h>
17#include <linux/fb.h>
18#include <linux/ioport.h>
19#include <linux/init.h>
20#include <linux/platform_device.h>
21#include <linux/screen_info.h>
22
23#include <video/vga.h>
24#include <asm/io.h>
25#include <asm/mtrr.h>
26
27#define dac_reg (0x3c8)
28#define dac_val (0x3c9)
29
30/* --------------------------------------------------------------------- */
31
32static struct fb_var_screeninfo vesafb_defined = {
33 .activate = FB_ACTIVATE_NOW,
34 .height = -1,
35 .width = -1,
36 .right_margin = 32,
37 .upper_margin = 16,
38 .lower_margin = 4,
39 .vsync_len = 4,
40 .vmode = FB_VMODE_NONINTERLACED,
41};
42
43static struct fb_fix_screeninfo vesafb_fix = {
44 .id = "VESA VGA",
45 .type = FB_TYPE_PACKED_PIXELS,
46 .accel = FB_ACCEL_NONE,
47};
48
49static int inverse __read_mostly;
50static int mtrr __read_mostly; /* disable mtrr */
51static int vram_remap; /* Set amount of memory to be used */
52static int vram_total; /* Set total amount of memory */
53static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */
54static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */
55static void (*pmi_start)(void) __read_mostly;
56static void (*pmi_pal) (void) __read_mostly;
57static int depth __read_mostly;
58static int vga_compat __read_mostly;
59/* --------------------------------------------------------------------- */
60
61static int vesafb_pan_display(struct fb_var_screeninfo *var,
62 struct fb_info *info)
63{
64#ifdef __i386__
65 int offset;
66
67 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
68
69 __asm__ __volatile__(
70 "call *(%%edi)"
71 : /* no return value */
72 : "a" (0x4f07), /* EAX */
73 "b" (0), /* EBX */
74 "c" (offset), /* ECX */
75 "d" (offset >> 16), /* EDX */
76 "D" (&pmi_start)); /* EDI */
77#endif
78 return 0;
79}
80
81static int vesa_setpalette(int regno, unsigned red, unsigned green,
82 unsigned blue)
83{
84 int shift = 16 - depth;
85 int err = -EINVAL;
86
87/*
88 * Try VGA registers first...
89 */
90 if (vga_compat) {
91 outb_p(regno, dac_reg);
92 outb_p(red >> shift, dac_val);
93 outb_p(green >> shift, dac_val);
94 outb_p(blue >> shift, dac_val);
95 err = 0;
96 }
97
98#ifdef __i386__
99/*
100 * Fallback to the PMI....
101 */
102 if (err && pmi_setpal) {
103 struct { u_char blue, green, red, pad; } entry;
104
105 entry.red = red >> shift;
106 entry.green = green >> shift;
107 entry.blue = blue >> shift;
108 entry.pad = 0;
109 __asm__ __volatile__(
110 "call *(%%esi)"
111 : /* no return value */
112 : "a" (0x4f09), /* EAX */
113 "b" (0), /* EBX */
114 "c" (1), /* ECX */
115 "d" (regno), /* EDX */
116 "D" (&entry), /* EDI */
117 "S" (&pmi_pal)); /* ESI */
118 err = 0;
119 }
120#endif
121
122 return err;
123}
124
125static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
126 unsigned blue, unsigned transp,
127 struct fb_info *info)
128{
129 int err = 0;
130
131 /*
132 * Set a single color register. The values supplied are
133 * already rounded down to the hardware's capabilities
134 * (according to the entries in the `var' structure). Return
135 * != 0 for invalid regno.
136 */
137
138 if (regno >= info->cmap.len)
139 return 1;
140
141 if (info->var.bits_per_pixel == 8)
142 err = vesa_setpalette(regno,red,green,blue);
143 else if (regno < 16) {
144 switch (info->var.bits_per_pixel) {
145 case 16:
146 if (info->var.red.offset == 10) {
147 /* 1:5:5:5 */
148 ((u32*) (info->pseudo_palette))[regno] =
149 ((red & 0xf800) >> 1) |
150 ((green & 0xf800) >> 6) |
151 ((blue & 0xf800) >> 11);
152 } else {
153 /* 0:5:6:5 */
154 ((u32*) (info->pseudo_palette))[regno] =
155 ((red & 0xf800) ) |
156 ((green & 0xfc00) >> 5) |
157 ((blue & 0xf800) >> 11);
158 }
159 break;
160 case 24:
161 case 32:
162 red >>= 8;
163 green >>= 8;
164 blue >>= 8;
165 ((u32 *)(info->pseudo_palette))[regno] =
166 (red << info->var.red.offset) |
167 (green << info->var.green.offset) |
168 (blue << info->var.blue.offset);
169 break;
170 }
171 }
172
173 return err;
174}
175
176static void vesafb_destroy(struct fb_info *info)
177{
178 fb_dealloc_cmap(&info->cmap);
179 if (info->screen_base)
180 iounmap(info->screen_base);
181 release_mem_region(info->apertures->ranges[0].base, info->apertures->ranges[0].size);
182}
183
184static struct fb_ops vesafb_ops = {
185 .owner = THIS_MODULE,
186 .fb_destroy = vesafb_destroy,
187 .fb_setcolreg = vesafb_setcolreg,
188 .fb_pan_display = vesafb_pan_display,
189 .fb_fillrect = cfb_fillrect,
190 .fb_copyarea = cfb_copyarea,
191 .fb_imageblit = cfb_imageblit,
192};
193
194static int vesafb_setup(char *options)
195{
196 char *this_opt;
197
198 if (!options || !*options)
199 return 0;
200
201 while ((this_opt = strsep(&options, ",")) != NULL) {
202 if (!*this_opt) continue;
203
204 if (! strcmp(this_opt, "inverse"))
205 inverse=1;
206 else if (! strcmp(this_opt, "redraw"))
207 ypan=0;
208 else if (! strcmp(this_opt, "ypan"))
209 ypan=1;
210 else if (! strcmp(this_opt, "ywrap"))
211 ypan=2;
212 else if (! strcmp(this_opt, "vgapal"))
213 pmi_setpal=0;
214 else if (! strcmp(this_opt, "pmipal"))
215 pmi_setpal=1;
216 else if (! strncmp(this_opt, "mtrr:", 5))
217 mtrr = simple_strtoul(this_opt+5, NULL, 0);
218 else if (! strcmp(this_opt, "nomtrr"))
219 mtrr=0;
220 else if (! strncmp(this_opt, "vtotal:", 7))
221 vram_total = simple_strtoul(this_opt+7, NULL, 0);
222 else if (! strncmp(this_opt, "vremap:", 7))
223 vram_remap = simple_strtoul(this_opt+7, NULL, 0);
224 }
225 return 0;
226}
227
228static int vesafb_probe(struct platform_device *dev)
229{
230 struct fb_info *info;
231 int i, err;
232 unsigned int size_vmode;
233 unsigned int size_remap;
234 unsigned int size_total;
235 char *option = NULL;
236
237 /* ignore error return of fb_get_options */
238 fb_get_options("vesafb", &option);
239 vesafb_setup(option);
240
241 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
242 return -ENODEV;
243
244 vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
245 vesafb_fix.smem_start = screen_info.lfb_base;
246 vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
247 if (15 == vesafb_defined.bits_per_pixel)
248 vesafb_defined.bits_per_pixel = 16;
249 vesafb_defined.xres = screen_info.lfb_width;
250 vesafb_defined.yres = screen_info.lfb_height;
251 vesafb_fix.line_length = screen_info.lfb_linelength;
252 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
253 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
254
255 /* size_vmode -- that is the amount of memory needed for the
256 * used video mode, i.e. the minimum amount of
257 * memory we need. */
258 size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
259
260 /* size_total -- all video memory we have. Used for mtrr
261 * entries, resource allocation and bounds
262 * checking. */
263 size_total = screen_info.lfb_size * 65536;
264 if (vram_total)
265 size_total = vram_total * 1024 * 1024;
266 if (size_total < size_vmode)
267 size_total = size_vmode;
268
269 /* size_remap -- the amount of video memory we are going to
270 * use for vesafb. With modern cards it is no
271 * option to simply use size_total as that
272 * wastes plenty of kernel address space. */
273 size_remap = size_vmode * 2;
274 if (vram_remap)
275 size_remap = vram_remap * 1024 * 1024;
276 if (size_remap < size_vmode)
277 size_remap = size_vmode;
278 if (size_remap > size_total)
279 size_remap = size_total;
280 vesafb_fix.smem_len = size_remap;
281
282#ifndef __i386__
283 screen_info.vesapm_seg = 0;
284#endif
285
286 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
287 printk(KERN_WARNING
288 "vesafb: cannot reserve video memory at 0x%lx\n",
289 vesafb_fix.smem_start);
290 /* We cannot make this fatal. Sometimes this comes from magic
291 spaces our resource handlers simply don't know about */
292 }
293
294 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
295 if (!info) {
296 release_mem_region(vesafb_fix.smem_start, size_total);
297 return -ENOMEM;
298 }
299 platform_set_drvdata(dev, info);
300 info->pseudo_palette = info->par;
301 info->par = NULL;
302
303 /* set vesafb aperture size for generic probing */
304 info->apertures = alloc_apertures(1);
305 if (!info->apertures) {
306 err = -ENOMEM;
307 goto err;
308 }
309 info->apertures->ranges[0].base = screen_info.lfb_base;
310 info->apertures->ranges[0].size = size_total;
311
312 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
313 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
314
315 if (screen_info.vesapm_seg) {
316 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
317 screen_info.vesapm_seg,screen_info.vesapm_off);
318 }
319
320 if (screen_info.vesapm_seg < 0xc000)
321 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
322
323 if (ypan || pmi_setpal) {
324 unsigned short *pmi_base;
325 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
326 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
327 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
328 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
329 if (pmi_base[3]) {
330 printk(KERN_INFO "vesafb: pmi: ports = ");
331 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
332 printk("%x ",pmi_base[i]);
333 printk("\n");
334 if (pmi_base[i] != 0xffff) {
335 /*
336 * memory areas not supported (yet?)
337 *
338 * Rules are: we have to set up a descriptor for the requested
339 * memory area and pass it in the ES register to the BIOS function.
340 */
341 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
342 ypan = pmi_setpal = 0;
343 }
344 }
345 }
346
347 if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
348 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
349 " colors may be incorrect\n");
350 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
351 }
352
353 vesafb_defined.xres_virtual = vesafb_defined.xres;
354 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
355 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
356 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
357 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
358 } else {
359 printk(KERN_INFO "vesafb: scrolling: redraw\n");
360 vesafb_defined.yres_virtual = vesafb_defined.yres;
361 ypan = 0;
362 }
363
364 /* some dummy values for timing to make fbset happy */
365 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
366 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
367 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
368
369 vesafb_defined.red.offset = screen_info.red_pos;
370 vesafb_defined.red.length = screen_info.red_size;
371 vesafb_defined.green.offset = screen_info.green_pos;
372 vesafb_defined.green.length = screen_info.green_size;
373 vesafb_defined.blue.offset = screen_info.blue_pos;
374 vesafb_defined.blue.length = screen_info.blue_size;
375 vesafb_defined.transp.offset = screen_info.rsvd_pos;
376 vesafb_defined.transp.length = screen_info.rsvd_size;
377
378 if (vesafb_defined.bits_per_pixel <= 8) {
379 depth = vesafb_defined.green.length;
380 vesafb_defined.red.length =
381 vesafb_defined.green.length =
382 vesafb_defined.blue.length =
383 vesafb_defined.bits_per_pixel;
384 }
385
386 printk(KERN_INFO "vesafb: %s: "
387 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
388 (vesafb_defined.bits_per_pixel > 8) ?
389 "Truecolor" : (vga_compat || pmi_setpal) ?
390 "Pseudocolor" : "Static Pseudocolor",
391 screen_info.rsvd_size,
392 screen_info.red_size,
393 screen_info.green_size,
394 screen_info.blue_size,
395 screen_info.rsvd_pos,
396 screen_info.red_pos,
397 screen_info.green_pos,
398 screen_info.blue_pos);
399
400 vesafb_fix.ypanstep = ypan ? 1 : 0;
401 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
402
403 /* request failure does not faze us, as vgacon probably has this
404 * region already (FIXME) */
405 request_region(0x3c0, 32, "vesafb");
406
407#ifdef CONFIG_MTRR
408 if (mtrr) {
409 unsigned int temp_size = size_total;
410 unsigned int type = 0;
411
412 switch (mtrr) {
413 case 1:
414 type = MTRR_TYPE_UNCACHABLE;
415 break;
416 case 2:
417 type = MTRR_TYPE_WRBACK;
418 break;
419 case 3:
420 type = MTRR_TYPE_WRCOMB;
421 break;
422 case 4:
423 type = MTRR_TYPE_WRTHROUGH;
424 break;
425 default:
426 type = 0;
427 break;
428 }
429
430 if (type) {
431 int rc;
432
433 /* Find the largest power-of-two */
434 temp_size = roundup_pow_of_two(temp_size);
435
436 /* Try and find a power of two to add */
437 do {
438 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
439 type, 1);
440 temp_size >>= 1;
441 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
442 }
443 }
444#endif
445
446 switch (mtrr) {
447 case 1: /* uncachable */
448 info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len);
449 break;
450 case 2: /* write-back */
451 info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len);
452 break;
453 case 3: /* write-combining */
454 info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
455 break;
456 case 4: /* write-through */
457 default:
458 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
459 break;
460 }
461 if (!info->screen_base) {
462 printk(KERN_ERR
463 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
464 vesafb_fix.smem_len, vesafb_fix.smem_start);
465 err = -EIO;
466 goto err;
467 }
468
469 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
470 "using %dk, total %dk\n",
471 vesafb_fix.smem_start, info->screen_base,
472 size_remap/1024, size_total/1024);
473
474 info->fbops = &vesafb_ops;
475 info->var = vesafb_defined;
476 info->fix = vesafb_fix;
477 info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
478 (ypan ? FBINFO_HWACCEL_YPAN : 0);
479
480 if (!ypan)
481 info->fbops->fb_pan_display = NULL;
482
483 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
484 err = -ENOMEM;
485 goto err;
486 }
487 if (register_framebuffer(info)<0) {
488 err = -EINVAL;
489 fb_dealloc_cmap(&info->cmap);
490 goto err;
491 }
492 fb_info(info, "%s frame buffer device\n", info->fix.id);
493 return 0;
494err:
495 if (info->screen_base)
496 iounmap(info->screen_base);
497 framebuffer_release(info);
498 release_mem_region(vesafb_fix.smem_start, size_total);
499 return err;
500}
501
502static int vesafb_remove(struct platform_device *pdev)
503{
504 struct fb_info *info = platform_get_drvdata(pdev);
505
506 unregister_framebuffer(info);
507 framebuffer_release(info);
508
509 return 0;
510}
511
512static struct platform_driver vesafb_driver = {
513 .driver = {
514 .name = "vesa-framebuffer",
515 .owner = THIS_MODULE,
516 },
517 .probe = vesafb_probe,
518 .remove = vesafb_remove,
519};
520
521module_platform_driver(vesafb_driver);
522MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-24 08:01:58 -0500