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vesafb.c
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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 <[email protected]>
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 
32 static struct fb_var_screeninfo vesafb_defined __initdata = {
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 
43 static struct fb_fix_screeninfo vesafb_fix __initdata = {
44  .id = "VESA VGA",
45  .type = FB_TYPE_PACKED_PIXELS,
46  .accel = FB_ACCEL_NONE,
47 };
48 
49 static int inverse __read_mostly;
50 static int mtrr __read_mostly; /* disable mtrr */
51 static int vram_remap __initdata; /* Set amount of memory to be used */
52 static int vram_total __initdata; /* Set total amount of memory */
53 static int pmi_setpal __read_mostly = 1; /* pmi for palette changes ??? */
54 static int ypan __read_mostly; /* 0..nothing, 1..ypan, 2..ywrap */
55 static void (*pmi_start)(void) __read_mostly;
56 static void (*pmi_pal) (void) __read_mostly;
57 static int depth __read_mostly;
58 static int vga_compat __read_mostly;
59 /* --------------------------------------------------------------------- */
60 
61 static 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 
81 static 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 
125 static 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 
176 static 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  framebuffer_release(info);
183 }
184 
185 static struct fb_ops vesafb_ops = {
186  .owner = THIS_MODULE,
187  .fb_destroy = vesafb_destroy,
188  .fb_setcolreg = vesafb_setcolreg,
189  .fb_pan_display = vesafb_pan_display,
190  .fb_fillrect = cfb_fillrect,
191  .fb_copyarea = cfb_copyarea,
192  .fb_imageblit = cfb_imageblit,
193 };
194 
195 static int __init vesafb_setup(char *options)
196 {
197  char *this_opt;
198 
199  if (!options || !*options)
200  return 0;
201 
202  while ((this_opt = strsep(&options, ",")) != NULL) {
203  if (!*this_opt) continue;
204 
205  if (! strcmp(this_opt, "inverse"))
206  inverse=1;
207  else if (! strcmp(this_opt, "redraw"))
208  ypan=0;
209  else if (! strcmp(this_opt, "ypan"))
210  ypan=1;
211  else if (! strcmp(this_opt, "ywrap"))
212  ypan=2;
213  else if (! strcmp(this_opt, "vgapal"))
214  pmi_setpal=0;
215  else if (! strcmp(this_opt, "pmipal"))
216  pmi_setpal=1;
217  else if (! strncmp(this_opt, "mtrr:", 5))
218  mtrr = simple_strtoul(this_opt+5, NULL, 0);
219  else if (! strcmp(this_opt, "nomtrr"))
220  mtrr=0;
221  else if (! strncmp(this_opt, "vtotal:", 7))
222  vram_total = simple_strtoul(this_opt+7, NULL, 0);
223  else if (! strncmp(this_opt, "vremap:", 7))
224  vram_remap = simple_strtoul(this_opt+7, NULL, 0);
225  }
226  return 0;
227 }
228 
229 static int __init vesafb_probe(struct platform_device *dev)
230 {
231  struct fb_info *info;
232  int i, err;
233  unsigned int size_vmode;
234  unsigned int size_remap;
235  unsigned int size_total;
236 
237  if (screen_info.orig_video_isVGA != VIDEO_TYPE_VLFB)
238  return -ENODEV;
239 
240  vga_compat = (screen_info.capabilities & 2) ? 0 : 1;
241  vesafb_fix.smem_start = screen_info.lfb_base;
242  vesafb_defined.bits_per_pixel = screen_info.lfb_depth;
243  if (15 == vesafb_defined.bits_per_pixel)
244  vesafb_defined.bits_per_pixel = 16;
245  vesafb_defined.xres = screen_info.lfb_width;
246  vesafb_defined.yres = screen_info.lfb_height;
247  vesafb_fix.line_length = screen_info.lfb_linelength;
248  vesafb_fix.visual = (vesafb_defined.bits_per_pixel == 8) ?
249  FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
250 
251  /* size_vmode -- that is the amount of memory needed for the
252  * used video mode, i.e. the minimum amount of
253  * memory we need. */
254  size_vmode = vesafb_defined.yres * vesafb_fix.line_length;
255 
256  /* size_total -- all video memory we have. Used for mtrr
257  * entries, resource allocation and bounds
258  * checking. */
259  size_total = screen_info.lfb_size * 65536;
260  if (vram_total)
261  size_total = vram_total * 1024 * 1024;
262  if (size_total < size_vmode)
263  size_total = size_vmode;
264 
265  /* size_remap -- the amount of video memory we are going to
266  * use for vesafb. With modern cards it is no
267  * option to simply use size_total as that
268  * wastes plenty of kernel address space. */
269  size_remap = size_vmode * 2;
270  if (vram_remap)
271  size_remap = vram_remap * 1024 * 1024;
272  if (size_remap < size_vmode)
273  size_remap = size_vmode;
274  if (size_remap > size_total)
275  size_remap = size_total;
276  vesafb_fix.smem_len = size_remap;
277 
278 #ifndef __i386__
279  screen_info.vesapm_seg = 0;
280 #endif
281 
282  if (!request_mem_region(vesafb_fix.smem_start, size_total, "vesafb")) {
283  printk(KERN_WARNING
284  "vesafb: cannot reserve video memory at 0x%lx\n",
285  vesafb_fix.smem_start);
286  /* We cannot make this fatal. Sometimes this comes from magic
287  spaces our resource handlers simply don't know about */
288  }
289 
290  info = framebuffer_alloc(sizeof(u32) * 256, &dev->dev);
291  if (!info) {
292  release_mem_region(vesafb_fix.smem_start, size_total);
293  return -ENOMEM;
294  }
295  info->pseudo_palette = info->par;
296  info->par = NULL;
297 
298  /* set vesafb aperture size for generic probing */
299  info->apertures = alloc_apertures(1);
300  if (!info->apertures) {
301  err = -ENOMEM;
302  goto err;
303  }
304  info->apertures->ranges[0].base = screen_info.lfb_base;
305  info->apertures->ranges[0].size = size_total;
306 
307  printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
308  vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
309 
310  if (screen_info.vesapm_seg) {
311  printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
312  screen_info.vesapm_seg,screen_info.vesapm_off);
313  }
314 
315  if (screen_info.vesapm_seg < 0xc000)
316  ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
317 
318  if (ypan || pmi_setpal) {
319  unsigned short *pmi_base;
320  pmi_base = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
321  pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
322  pmi_pal = (void*)((char*)pmi_base + pmi_base[2]);
323  printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
324  if (pmi_base[3]) {
325  printk(KERN_INFO "vesafb: pmi: ports = ");
326  for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
327  printk("%x ",pmi_base[i]);
328  printk("\n");
329  if (pmi_base[i] != 0xffff) {
330  /*
331  * memory areas not supported (yet?)
332  *
333  * Rules are: we have to set up a descriptor for the requested
334  * memory area and pass it in the ES register to the BIOS function.
335  */
336  printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
337  ypan = pmi_setpal = 0;
338  }
339  }
340  }
341 
342  if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
343  printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
344  " colors may be incorrect\n");
345  vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
346  }
347 
348  vesafb_defined.xres_virtual = vesafb_defined.xres;
349  vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
350  if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
351  printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
352  (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
353  } else {
354  printk(KERN_INFO "vesafb: scrolling: redraw\n");
355  vesafb_defined.yres_virtual = vesafb_defined.yres;
356  ypan = 0;
357  }
358 
359  /* some dummy values for timing to make fbset happy */
360  vesafb_defined.pixclock = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
361  vesafb_defined.left_margin = (vesafb_defined.xres / 8) & 0xf8;
362  vesafb_defined.hsync_len = (vesafb_defined.xres / 8) & 0xf8;
363 
364  vesafb_defined.red.offset = screen_info.red_pos;
365  vesafb_defined.red.length = screen_info.red_size;
366  vesafb_defined.green.offset = screen_info.green_pos;
367  vesafb_defined.green.length = screen_info.green_size;
368  vesafb_defined.blue.offset = screen_info.blue_pos;
369  vesafb_defined.blue.length = screen_info.blue_size;
370  vesafb_defined.transp.offset = screen_info.rsvd_pos;
371  vesafb_defined.transp.length = screen_info.rsvd_size;
372 
373  if (vesafb_defined.bits_per_pixel <= 8) {
374  depth = vesafb_defined.green.length;
375  vesafb_defined.red.length =
376  vesafb_defined.green.length =
377  vesafb_defined.blue.length =
378  vesafb_defined.bits_per_pixel;
379  }
380 
381  printk(KERN_INFO "vesafb: %s: "
382  "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
383  (vesafb_defined.bits_per_pixel > 8) ?
384  "Truecolor" : (vga_compat || pmi_setpal) ?
385  "Pseudocolor" : "Static Pseudocolor",
386  screen_info.rsvd_size,
387  screen_info.red_size,
388  screen_info.green_size,
389  screen_info.blue_size,
390  screen_info.rsvd_pos,
391  screen_info.red_pos,
392  screen_info.green_pos,
393  screen_info.blue_pos);
394 
395  vesafb_fix.ypanstep = ypan ? 1 : 0;
396  vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
397 
398  /* request failure does not faze us, as vgacon probably has this
399  * region already (FIXME) */
400  request_region(0x3c0, 32, "vesafb");
401 
402 #ifdef CONFIG_MTRR
403  if (mtrr) {
404  unsigned int temp_size = size_total;
405  unsigned int type = 0;
406 
407  switch (mtrr) {
408  case 1:
409  type = MTRR_TYPE_UNCACHABLE;
410  break;
411  case 2:
412  type = MTRR_TYPE_WRBACK;
413  break;
414  case 3:
415  type = MTRR_TYPE_WRCOMB;
416  break;
417  case 4:
418  type = MTRR_TYPE_WRTHROUGH;
419  break;
420  default:
421  type = 0;
422  break;
423  }
424 
425  if (type) {
426  int rc;
427 
428  /* Find the largest power-of-two */
429  temp_size = roundup_pow_of_two(temp_size);
430 
431  /* Try and find a power of two to add */
432  do {
433  rc = mtrr_add(vesafb_fix.smem_start, temp_size,
434  type, 1);
435  temp_size >>= 1;
436  } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
437  }
438  }
439 #endif
440 
441  switch (mtrr) {
442  case 1: /* uncachable */
443  info->screen_base = ioremap_nocache(vesafb_fix.smem_start, vesafb_fix.smem_len);
444  break;
445  case 2: /* write-back */
446  info->screen_base = ioremap_cache(vesafb_fix.smem_start, vesafb_fix.smem_len);
447  break;
448  case 3: /* write-combining */
449  info->screen_base = ioremap_wc(vesafb_fix.smem_start, vesafb_fix.smem_len);
450  break;
451  case 4: /* write-through */
452  default:
453  info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
454  break;
455  }
456  if (!info->screen_base) {
457  printk(KERN_ERR
458  "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
459  vesafb_fix.smem_len, vesafb_fix.smem_start);
460  err = -EIO;
461  goto err;
462  }
463 
464  printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
465  "using %dk, total %dk\n",
466  vesafb_fix.smem_start, info->screen_base,
467  size_remap/1024, size_total/1024);
468 
469  info->fbops = &vesafb_ops;
470  info->var = vesafb_defined;
471  info->fix = vesafb_fix;
472  info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
473  (ypan ? FBINFO_HWACCEL_YPAN : 0);
474 
475  if (!ypan)
476  info->fbops->fb_pan_display = NULL;
477 
478  if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
479  err = -ENOMEM;
480  goto err;
481  }
482  if (register_framebuffer(info)<0) {
483  err = -EINVAL;
484  fb_dealloc_cmap(&info->cmap);
485  goto err;
486  }
487  printk(KERN_INFO "fb%d: %s frame buffer device\n",
488  info->node, info->fix.id);
489  return 0;
490 err:
491  if (info->screen_base)
492  iounmap(info->screen_base);
493  framebuffer_release(info);
494  release_mem_region(vesafb_fix.smem_start, size_total);
495  return err;
496 }
497 
498 static struct platform_driver vesafb_driver = {
499  .driver = {
500  .name = "vesafb",
501  },
502 };
503 
504 static struct platform_device *vesafb_device;
505 
506 static int __init vesafb_init(void)
507 {
508  int ret;
509  char *option = NULL;
510 
511  /* ignore error return of fb_get_options */
512  fb_get_options("vesafb", &option);
513  vesafb_setup(option);
514 
515  vesafb_device = platform_device_alloc("vesafb", 0);
516  if (!vesafb_device)
517  return -ENOMEM;
518 
519  ret = platform_device_add(vesafb_device);
520  if (!ret) {
521  ret = platform_driver_probe(&vesafb_driver, vesafb_probe);
522  if (ret)
523  platform_device_del(vesafb_device);
524  }
525 
526  if (ret) {
527  platform_device_put(vesafb_device);
528  vesafb_device = NULL;
529  }
530 
531  return ret;
532 }
533 module_init(vesafb_init);
534 
535 MODULE_LICENSE("GPL");
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