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