Merge branch 'master' of git://git.infradead.org/users/dwmw2/solos-2.6
[sfrench/cifs-2.6.git] / 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           which_io;
195 };
196
197 static void leo_wait(struct leo_lx_krn __iomem *lx_krn)
198 {
199         int i;
200
201         for (i = 0;
202              (sbus_readl(&lx_krn->krn_csr) & LEO_KRN_CSR_PROGRESS) &&
203              i < 300000;
204              i++)
205                 udelay(1); /* Busy wait at most 0.3 sec */
206         return;
207 }
208
209 static void leo_switch_from_graph(struct fb_info *info)
210 {
211         struct leo_par *par = (struct leo_par *) info->par;
212         struct leo_ld_ss0 __iomem *ss = par->ld_ss0;
213         struct leo_cursor __iomem *cursor = par->cursor;
214         unsigned long flags;
215         u32 val;
216
217         spin_lock_irqsave(&par->lock, flags);
218
219         par->extent = ((info->var.xres - 1) |
220                        ((info->var.yres - 1) << 16));
221
222         sbus_writel(0xffffffff, &ss->wid);
223         sbus_writel(0xffff, &ss->wmask);
224         sbus_writel(0, &ss->vclipmin);
225         sbus_writel(par->extent, &ss->vclipmax);
226         sbus_writel(0, &ss->fg);
227         sbus_writel(0xff000000, &ss->planemask);
228         sbus_writel(0x310850, &ss->rop);
229         sbus_writel(0, &ss->widclip);
230         sbus_writel((info->var.xres-1) | ((info->var.yres-1) << 11),
231                     &par->lc_ss0_usr->extent);
232         sbus_writel(4, &par->lc_ss0_usr->addrspace);
233         sbus_writel(0x80000000, &par->lc_ss0_usr->fill);
234         sbus_writel(0, &par->lc_ss0_usr->fontt);
235         do {
236                 val = sbus_readl(&par->lc_ss0_usr->csr);
237         } while (val & 0x20000000);
238
239         /* setup screen buffer for cfb_* functions */
240         sbus_writel(1, &ss->wid);
241         sbus_writel(0x00ffffff, &ss->planemask);
242         sbus_writel(0x310b90, &ss->rop);
243         sbus_writel(0, &par->lc_ss0_usr->addrspace);
244
245         /* hide cursor */
246         sbus_writel(sbus_readl(&cursor->cur_misc) & ~LEO_CUR_ENABLE, &cursor->cur_misc);
247
248         spin_unlock_irqrestore(&par->lock, flags);
249 }
250
251 static int leo_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
252 {
253         /* We just use this to catch switches out of
254          * graphics mode.
255          */
256         leo_switch_from_graph(info);
257
258         if (var->xoffset || var->yoffset || var->vmode)
259                 return -EINVAL;
260         return 0;
261 }
262
263 /**
264  *      leo_setcolreg - Optional function. Sets a color register.
265  *      @regno: boolean, 0 copy local, 1 get_user() function
266  *      @red: frame buffer colormap structure
267  *      @green: The green value which can be up to 16 bits wide
268  *      @blue:  The blue value which can be up to 16 bits wide.
269  *      @transp: If supported the alpha value which can be up to 16 bits wide.
270  *      @info: frame buffer info structure
271  */
272 static int leo_setcolreg(unsigned regno,
273                          unsigned red, unsigned green, unsigned blue,
274                          unsigned transp, struct fb_info *info)
275 {
276         struct leo_par *par = (struct leo_par *) info->par;
277         struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
278         unsigned long flags;
279         u32 val;
280         int i;
281
282         if (regno >= 256)
283                 return 1;
284
285         red >>= 8;
286         green >>= 8;
287         blue >>= 8;
288
289         par->clut_data[regno] = red | (green << 8) | (blue << 16);
290
291         spin_lock_irqsave(&par->lock, flags);
292
293         leo_wait(lx_krn);
294
295         sbus_writel(LEO_KRN_TYPE_CLUTDATA, &lx_krn->krn_type);
296         for (i = 0; i < 256; i++)
297                 sbus_writel(par->clut_data[i], &lx_krn->krn_value);
298         sbus_writel(LEO_KRN_TYPE_CLUT0, &lx_krn->krn_type);
299
300         val = sbus_readl(&lx_krn->krn_csr);
301         val |= (LEO_KRN_CSR_UNK | LEO_KRN_CSR_UNK2);
302         sbus_writel(val, &lx_krn->krn_csr);
303
304         spin_unlock_irqrestore(&par->lock, flags);
305
306         return 0;
307 }
308
309 /**
310  *      leo_blank - Optional function.  Blanks the display.
311  *      @blank_mode: the blank mode we want.
312  *      @info: frame buffer structure that represents a single frame buffer
313  */
314 static int leo_blank(int blank, struct fb_info *info)
315 {
316         struct leo_par *par = (struct leo_par *) info->par;
317         struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
318         unsigned long flags;
319         u32 val;
320
321         spin_lock_irqsave(&par->lock, flags);
322
323         switch (blank) {
324         case FB_BLANK_UNBLANK: /* Unblanking */
325                 val = sbus_readl(&lx_krn->krn_csr);
326                 val |= LEO_KRN_CSR_ENABLE;
327                 sbus_writel(val, &lx_krn->krn_csr);
328                 par->flags &= ~LEO_FLAG_BLANKED;
329                 break;
330
331         case FB_BLANK_NORMAL: /* Normal blanking */
332         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
333         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
334         case FB_BLANK_POWERDOWN: /* Poweroff */
335                 val = sbus_readl(&lx_krn->krn_csr);
336                 val &= ~LEO_KRN_CSR_ENABLE;
337                 sbus_writel(val, &lx_krn->krn_csr);
338                 par->flags |= LEO_FLAG_BLANKED;
339                 break;
340         }
341
342         spin_unlock_irqrestore(&par->lock, flags);
343
344         return 0;
345 }
346
347 static struct sbus_mmap_map leo_mmap_map[] = {
348         {
349                 .voff   = LEO_SS0_MAP,
350                 .poff   = LEO_OFF_SS0,
351                 .size   = 0x800000
352         },
353         {
354                 .voff   = LEO_LC_SS0_USR_MAP,
355                 .poff   = LEO_OFF_LC_SS0_USR,
356                 .size   = 0x1000
357         },
358         {
359                 .voff   = LEO_LD_SS0_MAP,
360                 .poff   = LEO_OFF_LD_SS0,
361                 .size   = 0x1000
362         },
363         {
364                 .voff   = LEO_LX_CURSOR_MAP,
365                 .poff   = LEO_OFF_LX_CURSOR,
366                 .size   = 0x1000
367         },
368         {
369                 .voff   = LEO_SS1_MAP,
370                 .poff   = LEO_OFF_SS1,
371                 .size   = 0x800000
372         },
373         {
374                 .voff   = LEO_LC_SS1_USR_MAP,
375                 .poff   = LEO_OFF_LC_SS1_USR,
376                 .size   = 0x1000
377         },
378         {
379                 .voff   = LEO_LD_SS1_MAP,
380                 .poff   = LEO_OFF_LD_SS1,
381                 .size   = 0x1000
382         },
383         {
384                 .voff   = LEO_UNK_MAP,
385                 .poff   = LEO_OFF_UNK,
386                 .size   = 0x1000
387         },
388         {
389                 .voff   = LEO_LX_KRN_MAP,
390                 .poff   = LEO_OFF_LX_KRN,
391                 .size   = 0x1000
392         },
393         {
394                 .voff   = LEO_LC_SS0_KRN_MAP,
395                 .poff   = LEO_OFF_LC_SS0_KRN,
396                 .size   = 0x1000
397         },
398         {
399                 .voff   = LEO_LC_SS1_KRN_MAP,
400                 .poff   = LEO_OFF_LC_SS1_KRN,
401                 .size   = 0x1000
402         },
403         {
404                 .voff   = LEO_LD_GBL_MAP,
405                 .poff   = LEO_OFF_LD_GBL,
406                 .size   = 0x1000
407         },
408         {
409                 .voff   = LEO_UNK2_MAP,
410                 .poff   = LEO_OFF_UNK2,
411                 .size   = 0x100000
412         },
413         { .size = 0 }
414 };
415
416 static int leo_mmap(struct fb_info *info, struct vm_area_struct *vma)
417 {
418         struct leo_par *par = (struct leo_par *)info->par;
419
420         return sbusfb_mmap_helper(leo_mmap_map,
421                                   info->fix.smem_start, info->fix.smem_len,
422                                   par->which_io, vma);
423 }
424
425 static int leo_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
426 {
427         return sbusfb_ioctl_helper(cmd, arg, info,
428                                    FBTYPE_SUNLEO, 32, info->fix.smem_len);
429 }
430
431 /*
432  *  Initialisation
433  */
434
435 static void
436 leo_init_fix(struct fb_info *info, struct device_node *dp)
437 {
438         strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
439
440         info->fix.type = FB_TYPE_PACKED_PIXELS;
441         info->fix.visual = FB_VISUAL_TRUECOLOR;
442
443         info->fix.line_length = 8192;
444
445         info->fix.accel = FB_ACCEL_SUN_LEO;
446 }
447
448 static void leo_wid_put(struct fb_info *info, struct fb_wid_list *wl)
449 {
450         struct leo_par *par = (struct leo_par *) info->par;
451         struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
452         struct fb_wid_item *wi;
453         unsigned long flags;
454         u32 val;
455         int i, j;
456
457         spin_lock_irqsave(&par->lock, flags);
458
459         leo_wait(lx_krn);
460
461         for (i = 0, wi = wl->wl_list; i < wl->wl_count; i++, wi++) {
462                 switch (wi->wi_type) {
463                 case FB_WID_DBL_8:
464                         j = (wi->wi_index & 0xf) + 0x40;
465                         break;
466
467                 case FB_WID_DBL_24:
468                         j = wi->wi_index & 0x3f;
469                         break;
470
471                 default:
472                         continue;
473                 };
474                 sbus_writel(0x5800 + j, &lx_krn->krn_type);
475                 sbus_writel(wi->wi_values[0], &lx_krn->krn_value);
476         }
477         sbus_writel(LEO_KRN_TYPE_WID, &lx_krn->krn_type);
478
479         val = sbus_readl(&lx_krn->krn_csr);
480         val |= (LEO_KRN_CSR_UNK | LEO_KRN_CSR_UNK2);
481         sbus_writel(val, &lx_krn->krn_csr);
482
483         spin_unlock_irqrestore(&par->lock, flags);
484 }
485
486 static void leo_init_wids(struct fb_info *info)
487 {
488         struct fb_wid_item wi;
489         struct fb_wid_list wl;
490
491         wl.wl_count = 1;
492         wl.wl_list = &wi;
493         wi.wi_type = FB_WID_DBL_8;
494         wi.wi_index = 0;
495         wi.wi_values [0] = 0x2c0;
496         leo_wid_put(info, &wl);
497         wi.wi_index = 1;
498         wi.wi_values [0] = 0x30;
499         leo_wid_put(info, &wl);
500         wi.wi_index = 2;
501         wi.wi_values [0] = 0x20;
502         leo_wid_put(info, &wl);
503         wi.wi_type = FB_WID_DBL_24;
504         wi.wi_index = 1;
505         wi.wi_values [0] = 0x30;
506         leo_wid_put(info, &wl);
507 }
508
509 static void leo_init_hw(struct fb_info *info)
510 {
511         struct leo_par *par = (struct leo_par *) info->par;
512         u32 val;
513
514         val = sbus_readl(&par->ld_ss1->ss1_misc);
515         val |= LEO_SS1_MISC_ENABLE;
516         sbus_writel(val, &par->ld_ss1->ss1_misc);
517
518         leo_switch_from_graph(info);
519 }
520
521 static void leo_fixup_var_rgb(struct fb_var_screeninfo *var)
522 {
523         var->red.offset = 0;
524         var->red.length = 8;
525         var->green.offset = 8;
526         var->green.length = 8;
527         var->blue.offset = 16;
528         var->blue.length = 8;
529         var->transp.offset = 0;
530         var->transp.length = 0;
531 }
532
533 static void leo_unmap_regs(struct of_device *op, struct fb_info *info,
534                            struct leo_par *par)
535 {
536         if (par->lc_ss0_usr)
537                 of_iounmap(&op->resource[0], par->lc_ss0_usr, 0x1000);
538         if (par->ld_ss0)
539                 of_iounmap(&op->resource[0], par->ld_ss0, 0x1000);
540         if (par->ld_ss1)
541                 of_iounmap(&op->resource[0], par->ld_ss1, 0x1000);
542         if (par->lx_krn)
543                 of_iounmap(&op->resource[0], par->lx_krn, 0x1000);
544         if (par->cursor)
545                 of_iounmap(&op->resource[0],
546                            par->cursor, sizeof(struct leo_cursor));
547         if (info->screen_base)
548                 of_iounmap(&op->resource[0], info->screen_base, 0x800000);
549 }
550
551 static int __devinit leo_probe(struct of_device *op,
552                                const struct of_device_id *match)
553 {
554         struct device_node *dp = op->node;
555         struct fb_info *info;
556         struct leo_par *par;
557         int linebytes, err;
558
559         info = framebuffer_alloc(sizeof(struct leo_par), &op->dev);
560
561         err = -ENOMEM;
562         if (!info)
563                 goto out_err;
564         par = info->par;
565
566         spin_lock_init(&par->lock);
567
568         info->fix.smem_start = op->resource[0].start;
569         par->which_io = op->resource[0].flags & IORESOURCE_BITS;
570
571         sbusfb_fill_var(&info->var, dp, 32);
572         leo_fixup_var_rgb(&info->var);
573
574         linebytes = of_getintprop_default(dp, "linebytes",
575                                           info->var.xres);
576         info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
577
578         par->lc_ss0_usr =
579                 of_ioremap(&op->resource[0], LEO_OFF_LC_SS0_USR,
580                            0x1000, "leolc ss0usr");
581         par->ld_ss0 =
582                 of_ioremap(&op->resource[0], LEO_OFF_LD_SS0,
583                            0x1000, "leold ss0");
584         par->ld_ss1 =
585                 of_ioremap(&op->resource[0], LEO_OFF_LD_SS1,
586                            0x1000, "leold ss1");
587         par->lx_krn =
588                 of_ioremap(&op->resource[0], LEO_OFF_LX_KRN,
589                            0x1000, "leolx krn");
590         par->cursor =
591                 of_ioremap(&op->resource[0], LEO_OFF_LX_CURSOR,
592                            sizeof(struct leo_cursor), "leolx cursor");
593         info->screen_base =
594                 of_ioremap(&op->resource[0], LEO_OFF_SS0,
595                            0x800000, "leo ram");
596         if (!par->lc_ss0_usr ||
597             !par->ld_ss0 ||
598             !par->ld_ss1 ||
599             !par->lx_krn ||
600             !par->cursor ||
601             !info->screen_base)
602                 goto out_unmap_regs;
603
604         info->flags = FBINFO_DEFAULT;
605         info->fbops = &leo_ops;
606         info->pseudo_palette = par->clut_data;
607
608         leo_init_wids(info);
609         leo_init_hw(info);
610
611         leo_blank(FB_BLANK_UNBLANK, info);
612
613         if (fb_alloc_cmap(&info->cmap, 256, 0))
614                 goto out_unmap_regs;
615
616         leo_init_fix(info, dp);
617
618         err = register_framebuffer(info);
619         if (err < 0)
620                 goto out_dealloc_cmap;
621
622         dev_set_drvdata(&op->dev, info);
623
624         printk(KERN_INFO "%s: leo at %lx:%lx\n",
625                dp->full_name,
626                par->which_io, info->fix.smem_start);
627
628         return 0;
629
630 out_dealloc_cmap:
631         fb_dealloc_cmap(&info->cmap);
632
633 out_unmap_regs:
634         leo_unmap_regs(op, info, par);
635         framebuffer_release(info);
636
637 out_err:
638         return err;
639 }
640
641 static int __devexit leo_remove(struct of_device *op)
642 {
643         struct fb_info *info = dev_get_drvdata(&op->dev);
644         struct leo_par *par = info->par;
645
646         unregister_framebuffer(info);
647         fb_dealloc_cmap(&info->cmap);
648
649         leo_unmap_regs(op, info, par);
650
651         framebuffer_release(info);
652
653         dev_set_drvdata(&op->dev, NULL);
654
655         return 0;
656 }
657
658 static const struct of_device_id leo_match[] = {
659         {
660                 .name = "SUNW,leo",
661         },
662         {},
663 };
664 MODULE_DEVICE_TABLE(of, leo_match);
665
666 static struct of_platform_driver leo_driver = {
667         .name           = "leo",
668         .match_table    = leo_match,
669         .probe          = leo_probe,
670         .remove         = __devexit_p(leo_remove),
671 };
672
673 static int __init leo_init(void)
674 {
675         if (fb_get_options("leofb", NULL))
676                 return -ENODEV;
677
678         return of_register_driver(&leo_driver, &of_bus_type);
679 }
680
681 static void __exit leo_exit(void)
682 {
683         of_unregister_driver(&leo_driver);
684 }
685
686 module_init(leo_init);
687 module_exit(leo_exit);
688
689 MODULE_DESCRIPTION("framebuffer driver for LEO chipsets");
690 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
691 MODULE_VERSION("2.0");
692 MODULE_LICENSE("GPL");