[WATCHDOG] orion5x_wdt: Add shutdown callback, use watchdog ping function
[linux-2.6] / drivers / video / leo.c
1 /* leo.c: LEO frame buffer driver
2  *
3  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
4  * Copyright (C) 1996-1999 Jakub Jelinek (jj@ultra.linux.cz)
5  * Copyright (C) 1997 Michal Rehacek (Michal.Rehacek@st.mff.cuni.cz)
6  *
7  * Driver layout based loosely on tgafb.c, see that file for credits.
8  */
9
10 #include <linux/module.h>
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
13 #include <linux/string.h>
14 #include <linux/slab.h>
15 #include <linux/delay.h>
16 #include <linux/init.h>
17 #include <linux/fb.h>
18 #include <linux/mm.h>
19 #include <linux/of_device.h>
20 #include <linux/io.h>
21
22 #include <asm/fbio.h>
23
24 #include "sbuslib.h"
25
26 /*
27  * Local functions.
28  */
29
30 static int leo_setcolreg(unsigned, unsigned, unsigned, unsigned,
31                          unsigned, struct fb_info *);
32 static int leo_blank(int, struct fb_info *);
33
34 static int leo_mmap(struct fb_info *, struct vm_area_struct *);
35 static int leo_ioctl(struct fb_info *, unsigned int, unsigned long);
36 static int leo_pan_display(struct fb_var_screeninfo *, struct fb_info *);
37
38 /*
39  *  Frame buffer operations
40  */
41
42 static struct fb_ops leo_ops = {
43         .owner                  = THIS_MODULE,
44         .fb_setcolreg           = leo_setcolreg,
45         .fb_blank               = leo_blank,
46         .fb_pan_display         = leo_pan_display,
47         .fb_fillrect            = cfb_fillrect,
48         .fb_copyarea            = cfb_copyarea,
49         .fb_imageblit           = cfb_imageblit,
50         .fb_mmap                = leo_mmap,
51         .fb_ioctl               = leo_ioctl,
52 #ifdef CONFIG_COMPAT
53         .fb_compat_ioctl        = sbusfb_compat_ioctl,
54 #endif
55 };
56
57 #define LEO_OFF_LC_SS0_KRN      0x00200000UL
58 #define LEO_OFF_LC_SS0_USR      0x00201000UL
59 #define LEO_OFF_LC_SS1_KRN      0x01200000UL
60 #define LEO_OFF_LC_SS1_USR      0x01201000UL
61 #define LEO_OFF_LD_SS0          0x00400000UL
62 #define LEO_OFF_LD_SS1          0x01400000UL
63 #define LEO_OFF_LD_GBL          0x00401000UL
64 #define LEO_OFF_LX_KRN          0x00600000UL
65 #define LEO_OFF_LX_CURSOR       0x00601000UL
66 #define LEO_OFF_SS0             0x00800000UL
67 #define LEO_OFF_SS1             0x01800000UL
68 #define LEO_OFF_UNK             0x00602000UL
69 #define LEO_OFF_UNK2            0x00000000UL
70
71 #define LEO_CUR_ENABLE          0x00000080
72 #define LEO_CUR_UPDATE          0x00000030
73 #define LEO_CUR_PROGRESS        0x00000006
74 #define LEO_CUR_UPDATECMAP      0x00000003
75
76 #define LEO_CUR_TYPE_MASK       0x00000000
77 #define LEO_CUR_TYPE_IMAGE      0x00000020
78 #define LEO_CUR_TYPE_CMAP       0x00000050
79
80 struct leo_cursor {
81         u8      xxx0[16];
82         u32     cur_type;
83         u32     cur_misc;
84         u32     cur_cursxy;
85         u32     cur_data;
86 };
87
88 #define LEO_KRN_TYPE_CLUT0      0x00001000
89 #define LEO_KRN_TYPE_CLUT1      0x00001001
90 #define LEO_KRN_TYPE_CLUT2      0x00001002
91 #define LEO_KRN_TYPE_WID        0x00001003
92 #define LEO_KRN_TYPE_UNK        0x00001006
93 #define LEO_KRN_TYPE_VIDEO      0x00002003
94 #define LEO_KRN_TYPE_CLUTDATA   0x00004000
95 #define LEO_KRN_CSR_ENABLE      0x00000008
96 #define LEO_KRN_CSR_PROGRESS    0x00000004
97 #define LEO_KRN_CSR_UNK         0x00000002
98 #define LEO_KRN_CSR_UNK2        0x00000001
99
100 struct leo_lx_krn {
101         u32     krn_type;
102         u32     krn_csr;
103         u32     krn_value;
104 };
105
106 struct leo_lc_ss0_krn {
107         u32     misc;
108         u8      xxx0[0x800-4];
109         u32     rev;
110 };
111
112 struct leo_lc_ss0_usr {
113         u32     csr;
114         u32     addrspace;
115         u32     fontmsk;
116         u32     fontt;
117         u32     extent;
118         u32     src;
119         u32     dst;
120         u32     copy;
121         u32     fill;
122 };
123
124 struct leo_lc_ss1_krn {
125         u8      unknown;
126 };
127
128 struct leo_lc_ss1_usr {
129         u8      unknown;
130 };
131
132 struct leo_ld_ss0 {
133         u8      xxx0[0xe00];
134         u32     csr;
135         u32     wid;
136         u32     wmask;
137         u32     widclip;
138         u32     vclipmin;
139         u32     vclipmax;
140         u32     pickmin;        /* SS1 only */
141         u32     pickmax;        /* SS1 only */
142         u32     fg;
143         u32     bg;
144         u32     src;            /* Copy/Scroll (SS0 only) */
145         u32     dst;            /* Copy/Scroll/Fill (SS0 only) */
146         u32     extent;         /* Copy/Scroll/Fill size (SS0 only) */
147         u32     xxx1[3];
148         u32     setsem;         /* SS1 only */
149         u32     clrsem;         /* SS1 only */
150         u32     clrpick;        /* SS1 only */
151         u32     clrdat;         /* SS1 only */
152         u32     alpha;          /* SS1 only */
153         u8      xxx2[0x2c];
154         u32     winbg;
155         u32     planemask;
156         u32     rop;
157         u32     z;
158         u32     dczf;           /* SS1 only */
159         u32     dczb;           /* SS1 only */
160         u32     dcs;            /* SS1 only */
161         u32     dczs;           /* SS1 only */
162         u32     pickfb;         /* SS1 only */
163         u32     pickbb;         /* SS1 only */
164         u32     dcfc;           /* SS1 only */
165         u32     forcecol;       /* SS1 only */
166         u32     door[8];        /* SS1 only */
167         u32     pick[5];        /* SS1 only */
168 };
169
170 #define LEO_SS1_MISC_ENABLE     0x00000001
171 #define LEO_SS1_MISC_STEREO     0x00000002
172 struct leo_ld_ss1 {
173         u8      xxx0[0xef4];
174         u32     ss1_misc;
175 };
176
177 struct leo_ld_gbl {
178         u8      unknown;
179 };
180
181 struct leo_par {
182         spinlock_t              lock;
183         struct leo_lx_krn       __iomem *lx_krn;
184         struct leo_lc_ss0_usr   __iomem *lc_ss0_usr;
185         struct leo_ld_ss0       __iomem *ld_ss0;
186         struct leo_ld_ss1       __iomem *ld_ss1;
187         struct leo_cursor       __iomem *cursor;
188         u32                     extent;
189         u32                     clut_data[256];
190
191         u32                     flags;
192 #define LEO_FLAG_BLANKED        0x00000001
193
194         unsigned long           physbase;
195         unsigned long           which_io;
196         unsigned long           fbsize;
197 };
198
199 static void leo_wait(struct leo_lx_krn __iomem *lx_krn)
200 {
201         int i;
202
203         for (i = 0;
204              (sbus_readl(&lx_krn->krn_csr) & LEO_KRN_CSR_PROGRESS) &&
205              i < 300000;
206              i++)
207                 udelay(1); /* Busy wait at most 0.3 sec */
208         return;
209 }
210
211 static void leo_switch_from_graph(struct fb_info *info)
212 {
213         struct leo_par *par = (struct leo_par *) info->par;
214         struct leo_ld_ss0 __iomem *ss = par->ld_ss0;
215         struct leo_cursor __iomem *cursor = par->cursor;
216         unsigned long flags;
217         u32 val;
218
219         spin_lock_irqsave(&par->lock, flags);
220
221         par->extent = ((info->var.xres - 1) |
222                        ((info->var.yres - 1) << 16));
223
224         sbus_writel(0xffffffff, &ss->wid);
225         sbus_writel(0xffff, &ss->wmask);
226         sbus_writel(0, &ss->vclipmin);
227         sbus_writel(par->extent, &ss->vclipmax);
228         sbus_writel(0, &ss->fg);
229         sbus_writel(0xff000000, &ss->planemask);
230         sbus_writel(0x310850, &ss->rop);
231         sbus_writel(0, &ss->widclip);
232         sbus_writel((info->var.xres-1) | ((info->var.yres-1) << 11),
233                     &par->lc_ss0_usr->extent);
234         sbus_writel(4, &par->lc_ss0_usr->addrspace);
235         sbus_writel(0x80000000, &par->lc_ss0_usr->fill);
236         sbus_writel(0, &par->lc_ss0_usr->fontt);
237         do {
238                 val = sbus_readl(&par->lc_ss0_usr->csr);
239         } while (val & 0x20000000);
240
241         /* setup screen buffer for cfb_* functions */
242         sbus_writel(1, &ss->wid);
243         sbus_writel(0x00ffffff, &ss->planemask);
244         sbus_writel(0x310b90, &ss->rop);
245         sbus_writel(0, &par->lc_ss0_usr->addrspace);
246
247         /* hide cursor */
248         sbus_writel(sbus_readl(&cursor->cur_misc) & ~LEO_CUR_ENABLE, &cursor->cur_misc);
249
250         spin_unlock_irqrestore(&par->lock, flags);
251 }
252
253 static int leo_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
254 {
255         /* We just use this to catch switches out of
256          * graphics mode.
257          */
258         leo_switch_from_graph(info);
259
260         if (var->xoffset || var->yoffset || var->vmode)
261                 return -EINVAL;
262         return 0;
263 }
264
265 /**
266  *      leo_setcolreg - Optional function. Sets a color register.
267  *      @regno: boolean, 0 copy local, 1 get_user() function
268  *      @red: frame buffer colormap structure
269  *      @green: The green value which can be up to 16 bits wide
270  *      @blue:  The blue value which can be up to 16 bits wide.
271  *      @transp: If supported the alpha value which can be up to 16 bits wide.
272  *      @info: frame buffer info structure
273  */
274 static int leo_setcolreg(unsigned regno,
275                          unsigned red, unsigned green, unsigned blue,
276                          unsigned transp, struct fb_info *info)
277 {
278         struct leo_par *par = (struct leo_par *) info->par;
279         struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
280         unsigned long flags;
281         u32 val;
282         int i;
283
284         if (regno >= 256)
285                 return 1;
286
287         red >>= 8;
288         green >>= 8;
289         blue >>= 8;
290
291         par->clut_data[regno] = red | (green << 8) | (blue << 16);
292
293         spin_lock_irqsave(&par->lock, flags);
294
295         leo_wait(lx_krn);
296
297         sbus_writel(LEO_KRN_TYPE_CLUTDATA, &lx_krn->krn_type);
298         for (i = 0; i < 256; i++)
299                 sbus_writel(par->clut_data[i], &lx_krn->krn_value);
300         sbus_writel(LEO_KRN_TYPE_CLUT0, &lx_krn->krn_type);
301
302         val = sbus_readl(&lx_krn->krn_csr);
303         val |= (LEO_KRN_CSR_UNK | LEO_KRN_CSR_UNK2);
304         sbus_writel(val, &lx_krn->krn_csr);
305
306         spin_unlock_irqrestore(&par->lock, flags);
307
308         return 0;
309 }
310
311 /**
312  *      leo_blank - Optional function.  Blanks the display.
313  *      @blank_mode: the blank mode we want.
314  *      @info: frame buffer structure that represents a single frame buffer
315  */
316 static int leo_blank(int blank, struct fb_info *info)
317 {
318         struct leo_par *par = (struct leo_par *) info->par;
319         struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
320         unsigned long flags;
321         u32 val;
322
323         spin_lock_irqsave(&par->lock, flags);
324
325         switch (blank) {
326         case FB_BLANK_UNBLANK: /* Unblanking */
327                 val = sbus_readl(&lx_krn->krn_csr);
328                 val |= LEO_KRN_CSR_ENABLE;
329                 sbus_writel(val, &lx_krn->krn_csr);
330                 par->flags &= ~LEO_FLAG_BLANKED;
331                 break;
332
333         case FB_BLANK_NORMAL: /* Normal blanking */
334         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
335         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
336         case FB_BLANK_POWERDOWN: /* Poweroff */
337                 val = sbus_readl(&lx_krn->krn_csr);
338                 val &= ~LEO_KRN_CSR_ENABLE;
339                 sbus_writel(val, &lx_krn->krn_csr);
340                 par->flags |= LEO_FLAG_BLANKED;
341                 break;
342         }
343
344         spin_unlock_irqrestore(&par->lock, flags);
345
346         return 0;
347 }
348
349 static struct sbus_mmap_map leo_mmap_map[] = {
350         {
351                 .voff   = LEO_SS0_MAP,
352                 .poff   = LEO_OFF_SS0,
353                 .size   = 0x800000
354         },
355         {
356                 .voff   = LEO_LC_SS0_USR_MAP,
357                 .poff   = LEO_OFF_LC_SS0_USR,
358                 .size   = 0x1000
359         },
360         {
361                 .voff   = LEO_LD_SS0_MAP,
362                 .poff   = LEO_OFF_LD_SS0,
363                 .size   = 0x1000
364         },
365         {
366                 .voff   = LEO_LX_CURSOR_MAP,
367                 .poff   = LEO_OFF_LX_CURSOR,
368                 .size   = 0x1000
369         },
370         {
371                 .voff   = LEO_SS1_MAP,
372                 .poff   = LEO_OFF_SS1,
373                 .size   = 0x800000
374         },
375         {
376                 .voff   = LEO_LC_SS1_USR_MAP,
377                 .poff   = LEO_OFF_LC_SS1_USR,
378                 .size   = 0x1000
379         },
380         {
381                 .voff   = LEO_LD_SS1_MAP,
382                 .poff   = LEO_OFF_LD_SS1,
383                 .size   = 0x1000
384         },
385         {
386                 .voff   = LEO_UNK_MAP,
387                 .poff   = LEO_OFF_UNK,
388                 .size   = 0x1000
389         },
390         {
391                 .voff   = LEO_LX_KRN_MAP,
392                 .poff   = LEO_OFF_LX_KRN,
393                 .size   = 0x1000
394         },
395         {
396                 .voff   = LEO_LC_SS0_KRN_MAP,
397                 .poff   = LEO_OFF_LC_SS0_KRN,
398                 .size   = 0x1000
399         },
400         {
401                 .voff   = LEO_LC_SS1_KRN_MAP,
402                 .poff   = LEO_OFF_LC_SS1_KRN,
403                 .size   = 0x1000
404         },
405         {
406                 .voff   = LEO_LD_GBL_MAP,
407                 .poff   = LEO_OFF_LD_GBL,
408                 .size   = 0x1000
409         },
410         {
411                 .voff   = LEO_UNK2_MAP,
412                 .poff   = LEO_OFF_UNK2,
413                 .size   = 0x100000
414         },
415         { .size = 0 }
416 };
417
418 static int leo_mmap(struct fb_info *info, struct vm_area_struct *vma)
419 {
420         struct leo_par *par = (struct leo_par *)info->par;
421
422         return sbusfb_mmap_helper(leo_mmap_map,
423                                   par->physbase, par->fbsize,
424                                   par->which_io, vma);
425 }
426
427 static int leo_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
428 {
429         struct leo_par *par = (struct leo_par *) info->par;
430
431         return sbusfb_ioctl_helper(cmd, arg, info,
432                                    FBTYPE_SUNLEO, 32, par->fbsize);
433 }
434
435 /*
436  *  Initialisation
437  */
438
439 static void
440 leo_init_fix(struct fb_info *info, struct device_node *dp)
441 {
442         strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
443
444         info->fix.type = FB_TYPE_PACKED_PIXELS;
445         info->fix.visual = FB_VISUAL_TRUECOLOR;
446
447         info->fix.line_length = 8192;
448
449         info->fix.accel = FB_ACCEL_SUN_LEO;
450 }
451
452 static void leo_wid_put(struct fb_info *info, struct fb_wid_list *wl)
453 {
454         struct leo_par *par = (struct leo_par *) info->par;
455         struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
456         struct fb_wid_item *wi;
457         unsigned long flags;
458         u32 val;
459         int i, j;
460
461         spin_lock_irqsave(&par->lock, flags);
462
463         leo_wait(lx_krn);
464
465         for (i = 0, wi = wl->wl_list; i < wl->wl_count; i++, wi++) {
466                 switch (wi->wi_type) {
467                 case FB_WID_DBL_8:
468                         j = (wi->wi_index & 0xf) + 0x40;
469                         break;
470
471                 case FB_WID_DBL_24:
472                         j = wi->wi_index & 0x3f;
473                         break;
474
475                 default:
476                         continue;
477                 };
478                 sbus_writel(0x5800 + j, &lx_krn->krn_type);
479                 sbus_writel(wi->wi_values[0], &lx_krn->krn_value);
480         }
481         sbus_writel(LEO_KRN_TYPE_WID, &lx_krn->krn_type);
482
483         val = sbus_readl(&lx_krn->krn_csr);
484         val |= (LEO_KRN_CSR_UNK | LEO_KRN_CSR_UNK2);
485         sbus_writel(val, &lx_krn->krn_csr);
486
487         spin_unlock_irqrestore(&par->lock, flags);
488 }
489
490 static void leo_init_wids(struct fb_info *info)
491 {
492         struct fb_wid_item wi;
493         struct fb_wid_list wl;
494
495         wl.wl_count = 1;
496         wl.wl_list = &wi;
497         wi.wi_type = FB_WID_DBL_8;
498         wi.wi_index = 0;
499         wi.wi_values [0] = 0x2c0;
500         leo_wid_put(info, &wl);
501         wi.wi_index = 1;
502         wi.wi_values [0] = 0x30;
503         leo_wid_put(info, &wl);
504         wi.wi_index = 2;
505         wi.wi_values [0] = 0x20;
506         leo_wid_put(info, &wl);
507         wi.wi_type = FB_WID_DBL_24;
508         wi.wi_index = 1;
509         wi.wi_values [0] = 0x30;
510         leo_wid_put(info, &wl);
511 }
512
513 static void leo_init_hw(struct fb_info *info)
514 {
515         struct leo_par *par = (struct leo_par *) info->par;
516         u32 val;
517
518         val = sbus_readl(&par->ld_ss1->ss1_misc);
519         val |= LEO_SS1_MISC_ENABLE;
520         sbus_writel(val, &par->ld_ss1->ss1_misc);
521
522         leo_switch_from_graph(info);
523 }
524
525 static void leo_fixup_var_rgb(struct fb_var_screeninfo *var)
526 {
527         var->red.offset = 0;
528         var->red.length = 8;
529         var->green.offset = 8;
530         var->green.length = 8;
531         var->blue.offset = 16;
532         var->blue.length = 8;
533         var->transp.offset = 0;
534         var->transp.length = 0;
535 }
536
537 static void leo_unmap_regs(struct of_device *op, struct fb_info *info,
538                            struct leo_par *par)
539 {
540         if (par->lc_ss0_usr)
541                 of_iounmap(&op->resource[0], par->lc_ss0_usr, 0x1000);
542         if (par->ld_ss0)
543                 of_iounmap(&op->resource[0], par->ld_ss0, 0x1000);
544         if (par->ld_ss1)
545                 of_iounmap(&op->resource[0], par->ld_ss1, 0x1000);
546         if (par->lx_krn)
547                 of_iounmap(&op->resource[0], par->lx_krn, 0x1000);
548         if (par->cursor)
549                 of_iounmap(&op->resource[0],
550                            par->cursor, sizeof(struct leo_cursor));
551         if (info->screen_base)
552                 of_iounmap(&op->resource[0], info->screen_base, 0x800000);
553 }
554
555 static int __devinit leo_probe(struct of_device *op,
556                                const struct of_device_id *match)
557 {
558         struct device_node *dp = op->node;
559         struct fb_info *info;
560         struct leo_par *par;
561         int linebytes, err;
562
563         info = framebuffer_alloc(sizeof(struct leo_par), &op->dev);
564
565         err = -ENOMEM;
566         if (!info)
567                 goto out_err;
568         par = info->par;
569
570         spin_lock_init(&par->lock);
571
572         par->physbase = op->resource[0].start;
573         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
574
575         sbusfb_fill_var(&info->var, dp, 32);
576         leo_fixup_var_rgb(&info->var);
577
578         linebytes = of_getintprop_default(dp, "linebytes",
579                                           info->var.xres);
580         par->fbsize = PAGE_ALIGN(linebytes * info->var.yres);
581
582         par->lc_ss0_usr =
583                 of_ioremap(&op->resource[0], LEO_OFF_LC_SS0_USR,
584                            0x1000, "leolc ss0usr");
585         par->ld_ss0 =
586                 of_ioremap(&op->resource[0], LEO_OFF_LD_SS0,
587                            0x1000, "leold ss0");
588         par->ld_ss1 =
589                 of_ioremap(&op->resource[0], LEO_OFF_LD_SS1,
590                            0x1000, "leold ss1");
591         par->lx_krn =
592                 of_ioremap(&op->resource[0], LEO_OFF_LX_KRN,
593                            0x1000, "leolx krn");
594         par->cursor =
595                 of_ioremap(&op->resource[0], LEO_OFF_LX_CURSOR,
596                            sizeof(struct leo_cursor), "leolx cursor");
597         info->screen_base =
598                 of_ioremap(&op->resource[0], LEO_OFF_SS0,
599                            0x800000, "leo ram");
600         if (!par->lc_ss0_usr ||
601             !par->ld_ss0 ||
602             !par->ld_ss1 ||
603             !par->lx_krn ||
604             !par->cursor ||
605             !info->screen_base)
606                 goto out_unmap_regs;
607
608         info->flags = FBINFO_DEFAULT;
609         info->fbops = &leo_ops;
610         info->pseudo_palette = par->clut_data;
611
612         leo_init_wids(info);
613         leo_init_hw(info);
614
615         leo_blank(FB_BLANK_UNBLANK, info);
616
617         if (fb_alloc_cmap(&info->cmap, 256, 0))
618                 goto out_unmap_regs;
619
620         leo_init_fix(info, dp);
621
622         err = register_framebuffer(info);
623         if (err < 0)
624                 goto out_dealloc_cmap;
625
626         dev_set_drvdata(&op->dev, info);
627
628         printk(KERN_INFO "%s: leo at %lx:%lx\n",
629                dp->full_name,
630                par->which_io, par->physbase);
631
632         return 0;
633
634 out_dealloc_cmap:
635         fb_dealloc_cmap(&info->cmap);
636
637 out_unmap_regs:
638         leo_unmap_regs(op, info, par);
639         framebuffer_release(info);
640
641 out_err:
642         return err;
643 }
644
645 static int __devexit leo_remove(struct of_device *op)
646 {
647         struct fb_info *info = dev_get_drvdata(&op->dev);
648         struct leo_par *par = info->par;
649
650         unregister_framebuffer(info);
651         fb_dealloc_cmap(&info->cmap);
652
653         leo_unmap_regs(op, info, par);
654
655         framebuffer_release(info);
656
657         dev_set_drvdata(&op->dev, NULL);
658
659         return 0;
660 }
661
662 static const struct of_device_id leo_match[] = {
663         {
664                 .name = "SUNW,leo",
665         },
666         {},
667 };
668 MODULE_DEVICE_TABLE(of, leo_match);
669
670 static struct of_platform_driver leo_driver = {
671         .name           = "leo",
672         .match_table    = leo_match,
673         .probe          = leo_probe,
674         .remove         = __devexit_p(leo_remove),
675 };
676
677 static int __init leo_init(void)
678 {
679         if (fb_get_options("leofb", NULL))
680                 return -ENODEV;
681
682         return of_register_driver(&leo_driver, &of_bus_type);
683 }
684
685 static void __exit leo_exit(void)
686 {
687         of_unregister_driver(&leo_driver);
688 }
689
690 module_init(leo_init);
691 module_exit(leo_exit);
692
693 MODULE_DESCRIPTION("framebuffer driver for LEO chipsets");
694 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
695 MODULE_VERSION("2.0");
696 MODULE_LICENSE("GPL");