fbdev: add support for handoff from firmware to hw framebuffers
[sfrench/cifs-2.6.git] / drivers / video / vesafb.c
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
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
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
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 void vesafb_destroy(struct fb_info *info)
178 {
179         if (info->screen_base)
180                 iounmap(info->screen_base);
181         release_mem_region(info->aperture_base, info->aperture_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, ressource 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->aperture_base = screen_info.lfb_base;
300         info->aperture_size = size_total;
301
302         info->screen_base = ioremap(vesafb_fix.smem_start, vesafb_fix.smem_len);
303         if (!info->screen_base) {
304                 printk(KERN_ERR
305                        "vesafb: abort, cannot ioremap video memory 0x%x @ 0x%lx\n",
306                         vesafb_fix.smem_len, vesafb_fix.smem_start);
307                 err = -EIO;
308                 goto err;
309         }
310
311         printk(KERN_INFO "vesafb: framebuffer at 0x%lx, mapped to 0x%p, "
312                "using %dk, total %dk\n",
313                vesafb_fix.smem_start, info->screen_base,
314                size_remap/1024, size_total/1024);
315         printk(KERN_INFO "vesafb: mode is %dx%dx%d, linelength=%d, pages=%d\n",
316                vesafb_defined.xres, vesafb_defined.yres, vesafb_defined.bits_per_pixel, vesafb_fix.line_length, screen_info.pages);
317
318         if (screen_info.vesapm_seg) {
319                 printk(KERN_INFO "vesafb: protected mode interface info at %04x:%04x\n",
320                        screen_info.vesapm_seg,screen_info.vesapm_off);
321         }
322
323         if (screen_info.vesapm_seg < 0xc000)
324                 ypan = pmi_setpal = 0; /* not available or some DOS TSR ... */
325
326         if (ypan || pmi_setpal) {
327                 unsigned short *pmi_base;
328                 pmi_base  = (unsigned short*)phys_to_virt(((unsigned long)screen_info.vesapm_seg << 4) + screen_info.vesapm_off);
329                 pmi_start = (void*)((char*)pmi_base + pmi_base[1]);
330                 pmi_pal   = (void*)((char*)pmi_base + pmi_base[2]);
331                 printk(KERN_INFO "vesafb: pmi: set display start = %p, set palette = %p\n",pmi_start,pmi_pal);
332                 if (pmi_base[3]) {
333                         printk(KERN_INFO "vesafb: pmi: ports = ");
334                                 for (i = pmi_base[3]/2; pmi_base[i] != 0xffff; i++)
335                                         printk("%x ",pmi_base[i]);
336                         printk("\n");
337                         if (pmi_base[i] != 0xffff) {
338                                 /*
339                                  * memory areas not supported (yet?)
340                                  *
341                                  * Rules are: we have to set up a descriptor for the requested
342                                  * memory area and pass it in the ES register to the BIOS function.
343                                  */
344                                 printk(KERN_INFO "vesafb: can't handle memory requests, pmi disabled\n");
345                                 ypan = pmi_setpal = 0;
346                         }
347                 }
348         }
349
350         if (vesafb_defined.bits_per_pixel == 8 && !pmi_setpal && !vga_compat) {
351                 printk(KERN_WARNING "vesafb: hardware palette is unchangeable,\n"
352                                     "        colors may be incorrect\n");
353                 vesafb_fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
354         }
355
356         vesafb_defined.xres_virtual = vesafb_defined.xres;
357         vesafb_defined.yres_virtual = vesafb_fix.smem_len / vesafb_fix.line_length;
358         if (ypan && vesafb_defined.yres_virtual > vesafb_defined.yres) {
359                 printk(KERN_INFO "vesafb: scrolling: %s using protected mode interface, yres_virtual=%d\n",
360                        (ypan > 1) ? "ywrap" : "ypan",vesafb_defined.yres_virtual);
361         } else {
362                 printk(KERN_INFO "vesafb: scrolling: redraw\n");
363                 vesafb_defined.yres_virtual = vesafb_defined.yres;
364                 ypan = 0;
365         }
366
367         /* some dummy values for timing to make fbset happy */
368         vesafb_defined.pixclock     = 10000000 / vesafb_defined.xres * 1000 / vesafb_defined.yres;
369         vesafb_defined.left_margin  = (vesafb_defined.xres / 8) & 0xf8;
370         vesafb_defined.hsync_len    = (vesafb_defined.xres / 8) & 0xf8;
371         
372         vesafb_defined.red.offset    = screen_info.red_pos;
373         vesafb_defined.red.length    = screen_info.red_size;
374         vesafb_defined.green.offset  = screen_info.green_pos;
375         vesafb_defined.green.length  = screen_info.green_size;
376         vesafb_defined.blue.offset   = screen_info.blue_pos;
377         vesafb_defined.blue.length   = screen_info.blue_size;
378         vesafb_defined.transp.offset = screen_info.rsvd_pos;
379         vesafb_defined.transp.length = screen_info.rsvd_size;
380
381         if (vesafb_defined.bits_per_pixel <= 8) {
382                 depth = vesafb_defined.green.length;
383                 vesafb_defined.red.length =
384                 vesafb_defined.green.length =
385                 vesafb_defined.blue.length =
386                 vesafb_defined.bits_per_pixel;
387         }
388
389         printk(KERN_INFO "vesafb: %s: "
390                "size=%d:%d:%d:%d, shift=%d:%d:%d:%d\n",
391                (vesafb_defined.bits_per_pixel > 8) ?
392                "Truecolor" : (vga_compat || pmi_setpal) ?
393                "Pseudocolor" : "Static Pseudocolor",
394                screen_info.rsvd_size,
395                screen_info.red_size,
396                screen_info.green_size,
397                screen_info.blue_size,
398                screen_info.rsvd_pos,
399                screen_info.red_pos,
400                screen_info.green_pos,
401                screen_info.blue_pos);
402
403         vesafb_fix.ypanstep  = ypan     ? 1 : 0;
404         vesafb_fix.ywrapstep = (ypan>1) ? 1 : 0;
405
406         /* request failure does not faze us, as vgacon probably has this
407          * region already (FIXME) */
408         request_region(0x3c0, 32, "vesafb");
409
410 #ifdef CONFIG_MTRR
411         if (mtrr) {
412                 unsigned int temp_size = size_total;
413                 unsigned int type = 0;
414
415                 switch (mtrr) {
416                 case 1:
417                         type = MTRR_TYPE_UNCACHABLE;
418                         break;
419                 case 2:
420                         type = MTRR_TYPE_WRBACK;
421                         break;
422                 case 3:
423                         type = MTRR_TYPE_WRCOMB;
424                         break;
425                 case 4:
426                         type = MTRR_TYPE_WRTHROUGH;
427                         break;
428                 default:
429                         type = 0;
430                         break;
431                 }
432
433                 if (type) {
434                         int rc;
435
436                         /* Find the largest power-of-two */
437                         while (temp_size & (temp_size - 1))
438                                 temp_size &= (temp_size - 1);
439
440                         /* Try and find a power of two to add */
441                         do {
442                                 rc = mtrr_add(vesafb_fix.smem_start, temp_size,
443                                               type, 1);
444                                 temp_size >>= 1;
445                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
446                 }
447         }
448 #endif
449         
450         info->fbops = &vesafb_ops;
451         info->var = vesafb_defined;
452         info->fix = vesafb_fix;
453         info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
454                 (ypan ? FBINFO_HWACCEL_YPAN : 0);
455
456         if (!ypan)
457                 info->fbops->fb_pan_display = NULL;
458
459         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
460                 err = -ENOMEM;
461                 goto err;
462         }
463         if (register_framebuffer(info)<0) {
464                 err = -EINVAL;
465                 fb_dealloc_cmap(&info->cmap);
466                 goto err;
467         }
468         printk(KERN_INFO "fb%d: %s frame buffer device\n",
469                info->node, info->fix.id);
470         return 0;
471 err:
472         if (info->screen_base)
473                 iounmap(info->screen_base);
474         framebuffer_release(info);
475         release_mem_region(vesafb_fix.smem_start, size_total);
476         return err;
477 }
478
479 static struct platform_driver vesafb_driver = {
480         .probe  = vesafb_probe,
481         .driver = {
482                 .name   = "vesafb",
483         },
484 };
485
486 static struct platform_device *vesafb_device;
487
488 static int __init vesafb_init(void)
489 {
490         int ret;
491         char *option = NULL;
492
493         /* ignore error return of fb_get_options */
494         fb_get_options("vesafb", &option);
495         vesafb_setup(option);
496         ret = platform_driver_register(&vesafb_driver);
497
498         if (!ret) {
499                 vesafb_device = platform_device_alloc("vesafb", 0);
500
501                 if (vesafb_device)
502                         ret = platform_device_add(vesafb_device);
503                 else
504                         ret = -ENOMEM;
505
506                 if (ret) {
507                         platform_device_put(vesafb_device);
508                         platform_driver_unregister(&vesafb_driver);
509                 }
510         }
511
512         return ret;
513 }
514 module_init(vesafb_init);
515
516 MODULE_LICENSE("GPL");