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[PATCH] vesafb: Disable mtrr as the default
[linux-2.6/zen-sources.git] / drivers / video / vesafb.c
blobe25eae1a78c1de86e9f1f7f25103c12708c63a38
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/tty.h>
17 #include <linux/slab.h>
18 #include <linux/delay.h>
19 #include <linux/fb.h>
20 #include <linux/ioport.h>
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23
24 #include <video/vga.h>
25 #include <asm/io.h>
26 #include <asm/mtrr.h>
27
28 #define dac_reg (0x3c8)
29 #define dac_val (0x3c9)
30
31 /* --------------------------------------------------------------------- */
32
33 static struct fb_var_screeninfo vesafb_defined __initdata = {
34 .activate = FB_ACTIVATE_NOW,
35 .height = -1,
36 .width = -1,
37 .right_margin = 32,
38 .upper_margin = 16,
39 .lower_margin = 4,
40 .vsync_len = 4,
41 .vmode = FB_VMODE_NONINTERLACED,
42 };
43
44 static struct fb_fix_screeninfo vesafb_fix __initdata = {
45 .id = "VESA VGA",
46 .type = FB_TYPE_PACKED_PIXELS,
47 .accel = FB_ACCEL_NONE,
48 };
49
50 static int inverse = 0;
51 static int mtrr = 0; /* disable mtrr */
52 static int vram_remap __initdata = 0; /* Set amount of memory to be used */
53 static int vram_total __initdata = 0; /* Set total amount of memory */
54 static int pmi_setpal = 0; /* pmi for palette changes ??? */
55 static int ypan = 0; /* 0..nothing, 1..ypan, 2..ywrap */
56 static unsigned short *pmi_base = NULL;
57 static void (*pmi_start)(void);
58 static void (*pmi_pal)(void);
59 static int depth;
60 static int vga_compat;
61
62 /* --------------------------------------------------------------------- */
63
64 static int vesafb_pan_display(struct fb_var_screeninfo *var,
65 struct fb_info *info)
66 {
67 #ifdef __i386__
68 int offset;
69
70 if (!ypan)
71 return -EINVAL;
72 if (var->xoffset)
73 return -EINVAL;
74 if (var->yoffset > var->yres_virtual)
75 return -EINVAL;
76 if ((ypan==1) && var->yoffset+var->yres > var->yres_virtual)
77 return -EINVAL;
78
79 offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
80
81 __asm__ __volatile__(
82 "call *(%%edi)"
83 : /* no return value */
84 : "a" (0x4f07), /* EAX */
85 "b" (0), /* EBX */
86 "c" (offset), /* ECX */
87 "d" (offset >> 16), /* EDX */
88 "D" (&pmi_start)); /* EDI */
89 #endif
90 return 0;
91 }
92
93 static int vesafb_blank(int blank, struct fb_info *info)
94 {
95 int err = 1;
96
97 if (vga_compat) {
98 int loop = 10000;
99 u8 seq = 0, crtc17 = 0;
100
101 if (blank == FB_BLANK_POWERDOWN) {
102 seq = 0x20;
103 crtc17 = 0x00;
104 err = 0;
105 } else {
106 seq = 0x00;
107 crtc17 = 0x80;
108 err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
109 }
110
111 vga_wseq(NULL, 0x00, 0x01);
112 seq |= vga_rseq(NULL, 0x01) & ~0x20;
113 vga_wseq(NULL, 0x00, seq);
114
115 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
116 while (loop--);
117 vga_wcrt(NULL, 0x17, crtc17);
118 vga_wseq(NULL, 0x00, 0x03);
119 }
120
121 return err;
122 }
123
124 static void vesa_setpalette(int regno, unsigned red, unsigned green,
125 unsigned blue)
126 {
127 #ifdef __i386__
128 struct { u_char blue, green, red, pad; } entry;
129 int shift = 16 - depth;
130
131 if (pmi_setpal) {
132 entry.red = red >> shift;
133 entry.green = green >> shift;
134 entry.blue = blue >> shift;
135 entry.pad = 0;
136 __asm__ __volatile__(
137 "call *(%%esi)"
138 : /* no return value */
139 : "a" (0x4f09), /* EAX */
140 "b" (0), /* EBX */
141 "c" (1), /* ECX */
142 "d" (regno), /* EDX */
143 "D" (&entry), /* EDI */
144 "S" (&pmi_pal)); /* ESI */
145 } else {
146 /* without protected mode interface, try VGA registers... */
147 outb_p(regno, dac_reg);
148 outb_p(red >> shift, dac_val);
149 outb_p(green >> shift, dac_val);
150 outb_p(blue >> shift, dac_val);
151 }
152 #endif
153 }
154
155 static int vesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
156 unsigned blue, unsigned transp,
157 struct fb_info *info)
158 {
159 /*
160 * Set a single color register. The values supplied are
161 * already rounded down to the hardware's capabilities
162 * (according to the entries in the `var' structure). Return
163 * != 0 for invalid regno.
164 */
165
166 if (regno >= info->cmap.len)
167 return 1;
168
169 if (info->var.bits_per_pixel == 8)
170 vesa_setpalette(regno,red,green,blue);
171 else if (regno < 16) {
172 switch (info->var.bits_per_pixel) {
173 case 16:
174 if (info->var.red.offset == 10) {
175 /* 1:5:5:5 */
176 ((u32*) (info->pseudo_palette))[regno] =
177 ((red & 0xf800) >> 1) |
178 ((green & 0xf800) >> 6) |
179 ((blue & 0xf800) >> 11);
180 } else {
181 /* 0:5:6:5 */
182 ((u32*) (info->pseudo_palette))[regno] =
183 ((red & 0xf800) ) |
184 ((green & 0xfc00) >> 5) |
185 ((blue & 0xf800) >> 11);
186 }
187 break;
188 case 24:
189 case 32:
190 red >>= 8;
191 green >>= 8;
192 blue >>= 8;
193 ((u32 *)(info->pseudo_palette))[regno] =
194 (red << info->var.red.offset) |
195 (green << info->var.green.offset) |
196 (blue << info->var.blue.offset);
197 break;
198 }
199 }
200
201 return 0;
202 }
203
204 static struct fb_ops vesafb_ops = {
205 .owner = THIS_MODULE,
206 .fb_setcolreg = vesafb_setcolreg,
207 .fb_pan_display = vesafb_pan_display,
208 .fb_blank = vesafb_blank,
209 .fb_fillrect = cfb_fillrect,
210 .fb_copyarea = cfb_copyarea,
211 .fb_imageblit = cfb_imageblit,
212 };
213
214 static int __init vesafb_setup(char *options)
215 {
216 char *this_opt;
217
218 if (!options || !*options)
219 return 0;
220
221 while ((this_opt = strsep(&options, ",")) != NULL) {
222 if (!*this_opt) continue;
223
224 if (! strcmp(this_opt, "inverse"))
225 inverse=1;
226 else if (! strcmp(this_opt, "redraw"))
227 ypan=0;
228 else if (! strcmp(this_opt, "ypan"))
229 ypan=1;
230 else if (! strcmp(this_opt, "ywrap"))
231 ypan=2;
232 else if (! strcmp(this_opt, "vgapal"))
233 pmi_setpal=0;
234 else if (! strcmp(this_opt, "pmipal"))
235 pmi_setpal=1;
236 else if (! strncmp(this_opt, "mtrr:", 5))
237 mtrr = simple_strtoul(this_opt+5, NULL, 0);
238 else if (! strcmp(this_opt, "nomtrr"))
239 mtrr=0;
240 else if (! strncmp(this_opt, "vtotal:", 7))
241 vram_total = simple_strtoul(this_opt+7, NULL, 0);
242 else if (! strncmp(this_opt, "vremap:", 7))
243 vram_remap = simple_strtoul(this_opt+7, NULL, 0);
244 }
245 return 0;
246 }
247
248 static int __init vesafb_probe(struct device *device)
249 {
250 struct platform_device *dev = to_platform_device(device);
251 struct fb_info *info;
252 int i, err;
253 unsigned int size_vmode;
254 unsigned int size_remap;
255 unsigned int size_total;
256
257 if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
258 return -ENODEV;
259
260 vesafb_fix.smem_start = screen_info.lfb_base;
261 vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
262 if (15 == vesafb_defined.bits_per_pixel)
263 vesafb_defined.bits_per_pixel = 16;
264 vesafb_defined.xres = screen_info.lfb_width;
265 vesafb_defined.yres = screen_info.lfb_height;
266 vesafb_fix.line_length = screen_info.lfb_linelength;
267 vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
268 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
269
270 /* size_vmode -- that is the amount of memory needed for the
271 * used video mode, i.e. the minimum amount of
272 * memory we need. */
273 size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
274
275 /* size_total -- all video memory we have. Used for mtrr
276 * entries, ressource allocation and bounds
277 * checking. */
278 size_total = screen_info.lfb_size * 65536;
279 if (vram_total)
280 size_total = vram_total * 1024 * 1024;
281 if (size_total < size_vmode)
282 size_total = size_vmode;
283
284 /* size_remap -- the amount of video memory we are going to
285 * use for vesafb. With modern cards it is no
286 * option to simply use size_total as that
287 * wastes plenty of kernel address space. */
288 size_remap = size_vmode * 2;
289 if (vram_remap)
290 size_remap = vram_remap * 1024 * 1024;
291 if (size_remap < size_vmode)
292 size_remap = size_vmode;
293 if (size_remap > size_total)
294 size_remap = size_total;
295 vesafb_fix.smem_len = size_remap;
296
297 #ifndef __i386__
298 screen_info.vesapm_seg = 0;
299 #endif
300
301 if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
302 printk(KERN_WARNING
303 "vesafb: cannot reserve video memory at 0x%lx\n",
304 vesafb_fix.smem_start);
305 /* We cannot make this fatal. Sometimes this comes from magic
306 spaces our resource handlers simply don't know about */
307 }
308
309 info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
310 if (!info) {
311 release_mem_region(vesafb_fix.smem_start, size_total);
312 return -ENOMEM;
313 }
314 info->pseudo_palette = info->par;
315 info->par = NULL;
316
317 info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
318 if (!info->screen_base) {
319 printk(KERN_ERR
320 "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
321 vesafb_fix.smem_len, vesafb_fix.smem_start);
322 err = -EIO;
323 goto err;
324 }
325
326 printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
327 "using %dk, total %dk\n",
328 vesafb_fix.smem_start, info->screen_base,
329 size_remap/1024, size_total/1024);
330 printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
331 vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
332
333 if (screen_info.vesapm_seg) {
334 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
335 screen_info.vesapm_seg,screen_info.vesapm_off);
336 }
337
338 if (screen_info.vesapm_seg < 0xc000)
339 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
340
341 if (ypan || pmi_setpal) {
342 pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
343 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
344 pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
345 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
346 if (pmi_base[3]) {
347 printk(KERN_INFO "vesafb: pmi: ports = ");
348 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
349 printk("%x ",pmi_base[i]);
350 printk("\n");
351 if (pmi_base[i] != 0xffff) {
352 /*
353 * memory areas not supported (yet?)
354 *
355 * Rules are: we have to set up a descriptor for the requested
356 * memory area and pass it in the ES register to the BIOS function.
357 */
358 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
359 ypan = pmi_setpal = 0;
360 }
361 }
362 }
363
364 vesafb_defined.xres_virtual = vesafb_defined.xres;
365 vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
366 if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
367 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
368 (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
369 } else {
370 printk(KERN_INFO "vesafb: scrolling: redraw\n");
371 vesafb_defined.yres_virtual = vesafb_defined.yres;
372 ypan = 0;
373 }
374
375 /* some dummy values for timing to make fbset happy */
376 vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
377 vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
378 vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
379
380 vesafb_defined.red.offset = screen_info.red_pos;
381 vesafb_defined.red.length = screen_info.red_size;
382 vesafb_defined.green.offset = screen_info.green_pos;
383 vesafb_defined.green.length = screen_info.green_size;
384 vesafb_defined.blue.offset = screen_info.blue_pos;
385 vesafb_defined.blue.length = screen_info.blue_size;
386 vesafb_defined.transp.offset = screen_info.rsvd_pos;
387 vesafb_defined.transp.length = screen_info.rsvd_size;
388
389 if (vesafb_defined.bits_per_pixel <= 8) {
390 depth = vesafb_defined.green.length;
391 vesafb_defined.red.length =
392 vesafb_defined.green.length =
393 vesafb_defined.blue.length =
394 vesafb_defined.bits_per_pixel;
395 }
396
397 printk(KERN_INFO "vesafb: %s: "
398 "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
399 (vesafb_defined.bits_per_pixel > 8) ?
400 "Truecolor" : "Pseudocolor",
401 screen_info.rsvd_size,
402 screen_info.red_size,
403 screen_info.green_size,
404 screen_info.blue_size,
405 screen_info.rsvd_pos,
406 screen_info.red_pos,
407 screen_info.green_pos,
408 screen_info.blue_pos);
409
410 vesafb_fix.ypanstep = ypan ? 1 : 0;
411 vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
412
413 /* request failure does not faze us, as vgacon probably has this
414 * region already (FIXME) */
415 request_region(0x3c0, 32, "vesafb");
416
417 if (mtrr) {
418 unsigned int temp_size = size_total;
419 unsigned int type = 0;
420
421 switch (mtrr) {
422 case 1:
423 type = MTRR_TYPE_UNCACHABLE;
424 break;
425 case 2:
426 type = MTRR_TYPE_WRBACK;
427 break;
428 case 3:
429 type = MTRR_TYPE_WRCOMB;
430 break;
431 case 4:
432 type = MTRR_TYPE_WRTHROUGH;
433 break;
434 default:
435 type = 0;
436 break;
437 }
438
439 if (type) {
440 int rc;
441
442 /* Find the largest power-of-two */
443 while (temp_size & (temp_size - 1))
444 temp_size &= (temp_size - 1);
445
446 /* Try and find a power of two to add */
447 do {
448 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
449 type, 1);
450 temp_size >>= 1;
451 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
452 }
453 }
454
455 info->fbops = &vesafb_ops;
456 info->var = vesafb_defined;
457 info->fix = vesafb_fix;
458 info->flags = FBINFO_FLAG_DEFAULT |
459 (ypan) ? FBINFO_HWACCEL_YPAN : 0;
460
461 vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
462 printk("vesafb: Mode is %sVGA compatible\n",
463 (vga_compat) ? "" : "not ");
464
465 if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
466 err = -ENOMEM;
467 goto err;
468 }
469 if (register_framebuffer(info)<0) {
470 err = -EINVAL;
471 fb_dealloc_cmap(&info->cmap);
472 goto err;
473 }
474 printk(KERN_INFO "fb%d: %s frame buffer device\n",
475 info->node, info->fix.id);
476 return 0;
477 err:
478 framebuffer_release(info);
479 release_mem_region(vesafb_fix.smem_start, size_total);
480 return err;
481 }
482
483 static struct device_driver vesafb_driver = {
484 .name = "vesafb",
485 .bus = &platform_bus_type,
486 .probe = vesafb_probe,
487 };
488
489 static struct platform_device vesafb_device = {
490 .name = "vesafb",
491 };
492
493 static int __init vesafb_init(void)
494 {
495 int ret;
496 char *option = NULL;
497
498 /* ignore error return of fb_get_options */
499 fb_get_options("vesafb", &option);
500 vesafb_setup(option);
501 ret = driver_register(&vesafb_driver);
502
503 if (!ret) {
504 ret = platform_device_register(&vesafb_device);
505 if (ret)
506 driver_unregister(&vesafb_driver);
507 }
508 return ret;
509 }
510 module_init(vesafb_init);
511
512 MODULE_LICENSE("GPL");
Stable & featurefull patchset based on Linus's git branch