ide: another possible ide panic fix for blk-end-request
[linux-2.6] / drivers / video / imxfb.c
1 /*
2  *  linux/drivers/video/imxfb.c
3  *
4  *  Freescale i.MX Frame Buffer device driver
5  *
6  *  Copyright (C) 2004 Sascha Hauer, Pengutronix
7  *   Based on acornfb.c Copyright (C) Russell King.
8  *
9  * This file is subject to the terms and conditions of the GNU General Public
10  * License.  See the file COPYING in the main directory of this archive for
11  * more details.
12  *
13  * Please direct your questions and comments on this driver to the following
14  * email address:
15  *
16  *      linux-arm-kernel@lists.arm.linux.org.uk
17  */
18
19 //#define DEBUG 1
20
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/errno.h>
24 #include <linux/string.h>
25 #include <linux/interrupt.h>
26 #include <linux/slab.h>
27 #include <linux/fb.h>
28 #include <linux/delay.h>
29 #include <linux/init.h>
30 #include <linux/ioport.h>
31 #include <linux/cpufreq.h>
32 #include <linux/platform_device.h>
33 #include <linux/dma-mapping.h>
34
35 #include <asm/hardware.h>
36 #include <asm/io.h>
37 #include <asm/arch/imxfb.h>
38
39 /*
40  * Complain if VAR is out of range.
41  */
42 #define DEBUG_VAR 1
43
44 #include "imxfb.h"
45
46 static struct imxfb_rgb def_rgb_16 = {
47         .red    = { .offset = 8,  .length = 4, },
48         .green  = { .offset = 4,  .length = 4, },
49         .blue   = { .offset = 0,  .length = 4, },
50         .transp = { .offset = 0,  .length = 0, },
51 };
52
53 static struct imxfb_rgb def_rgb_8 = {
54         .red    = { .offset = 0,  .length = 8, },
55         .green  = { .offset = 0,  .length = 8, },
56         .blue   = { .offset = 0,  .length = 8, },
57         .transp = { .offset = 0,  .length = 0, },
58 };
59
60 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info);
61
62 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
63 {
64         chan &= 0xffff;
65         chan >>= 16 - bf->length;
66         return chan << bf->offset;
67 }
68
69 #define LCDC_PALETTE(x) __REG2(IMX_LCDC_BASE+0x800, (x)<<2)
70 static int
71 imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
72                        u_int trans, struct fb_info *info)
73 {
74         struct imxfb_info *fbi = info->par;
75         u_int val, ret = 1;
76
77 #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16)
78         if (regno < fbi->palette_size) {
79                 val = (CNVT_TOHW(red, 4) << 8) |
80                       (CNVT_TOHW(green,4) << 4) |
81                       CNVT_TOHW(blue,  4);
82
83                 LCDC_PALETTE(regno) = val;
84                 ret = 0;
85         }
86         return ret;
87 }
88
89 static int
90 imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
91                    u_int trans, struct fb_info *info)
92 {
93         struct imxfb_info *fbi = info->par;
94         unsigned int val;
95         int ret = 1;
96
97         /*
98          * If inverse mode was selected, invert all the colours
99          * rather than the register number.  The register number
100          * is what you poke into the framebuffer to produce the
101          * colour you requested.
102          */
103         if (fbi->cmap_inverse) {
104                 red   = 0xffff - red;
105                 green = 0xffff - green;
106                 blue  = 0xffff - blue;
107         }
108
109         /*
110          * If greyscale is true, then we convert the RGB value
111          * to greyscale no mater what visual we are using.
112          */
113         if (info->var.grayscale)
114                 red = green = blue = (19595 * red + 38470 * green +
115                                         7471 * blue) >> 16;
116
117         switch (info->fix.visual) {
118         case FB_VISUAL_TRUECOLOR:
119                 /*
120                  * 12 or 16-bit True Colour.  We encode the RGB value
121                  * according to the RGB bitfield information.
122                  */
123                 if (regno < 16) {
124                         u32 *pal = info->pseudo_palette;
125
126                         val  = chan_to_field(red, &info->var.red);
127                         val |= chan_to_field(green, &info->var.green);
128                         val |= chan_to_field(blue, &info->var.blue);
129
130                         pal[regno] = val;
131                         ret = 0;
132                 }
133                 break;
134
135         case FB_VISUAL_STATIC_PSEUDOCOLOR:
136         case FB_VISUAL_PSEUDOCOLOR:
137                 ret = imxfb_setpalettereg(regno, red, green, blue, trans, info);
138                 break;
139         }
140
141         return ret;
142 }
143
144 /*
145  *  imxfb_check_var():
146  *    Round up in the following order: bits_per_pixel, xres,
147  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
148  *    bitfields, horizontal timing, vertical timing.
149  */
150 static int
151 imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
152 {
153         struct imxfb_info *fbi = info->par;
154         int rgbidx;
155
156         if (var->xres < MIN_XRES)
157                 var->xres = MIN_XRES;
158         if (var->yres < MIN_YRES)
159                 var->yres = MIN_YRES;
160         if (var->xres > fbi->max_xres)
161                 var->xres = fbi->max_xres;
162         if (var->yres > fbi->max_yres)
163                 var->yres = fbi->max_yres;
164         var->xres_virtual = max(var->xres_virtual, var->xres);
165         var->yres_virtual = max(var->yres_virtual, var->yres);
166
167         pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel);
168         switch (var->bits_per_pixel) {
169         case 16:
170                 rgbidx = RGB_16;
171                 break;
172         case 8:
173                 rgbidx = RGB_8;
174                 break;
175         default:
176                 rgbidx = RGB_16;
177         }
178
179         /*
180          * Copy the RGB parameters for this display
181          * from the machine specific parameters.
182          */
183         var->red    = fbi->rgb[rgbidx]->red;
184         var->green  = fbi->rgb[rgbidx]->green;
185         var->blue   = fbi->rgb[rgbidx]->blue;
186         var->transp = fbi->rgb[rgbidx]->transp;
187
188         pr_debug("RGBT length = %d:%d:%d:%d\n",
189                 var->red.length, var->green.length, var->blue.length,
190                 var->transp.length);
191
192         pr_debug("RGBT offset = %d:%d:%d:%d\n",
193                 var->red.offset, var->green.offset, var->blue.offset,
194                 var->transp.offset);
195
196         return 0;
197 }
198
199 /*
200  * imxfb_set_par():
201  *      Set the user defined part of the display for the specified console
202  */
203 static int imxfb_set_par(struct fb_info *info)
204 {
205         struct imxfb_info *fbi = info->par;
206         struct fb_var_screeninfo *var = &info->var;
207
208         pr_debug("set_par\n");
209
210         if (var->bits_per_pixel == 16)
211                 info->fix.visual = FB_VISUAL_TRUECOLOR;
212         else if (!fbi->cmap_static)
213                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
214         else {
215                 /*
216                  * Some people have weird ideas about wanting static
217                  * pseudocolor maps.  I suspect their user space
218                  * applications are broken.
219                  */
220                 info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
221         }
222
223         info->fix.line_length = var->xres_virtual *
224                                   var->bits_per_pixel / 8;
225         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
226
227         imxfb_activate_var(var, info);
228
229         return 0;
230 }
231
232 static void imxfb_enable_controller(struct imxfb_info *fbi)
233 {
234         pr_debug("Enabling LCD controller\n");
235
236         /* initialize LCDC */
237         LCDC_RMCR &= ~RMCR_LCDC_EN;             /* just to be safe... */
238
239         LCDC_SSA        = fbi->screen_dma;
240         /* physical screen start address            */
241         LCDC_VPW        = VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4);
242
243         LCDC_POS        = 0x00000000;   /* panning offset 0 (0 pixel offset)        */
244
245         /* disable hardware cursor */
246         LCDC_CPOS       &= ~(CPOS_CC0 | CPOS_CC1);
247
248         LCDC_RMCR = RMCR_LCDC_EN;
249
250         if(fbi->backlight_power)
251                 fbi->backlight_power(1);
252         if(fbi->lcd_power)
253                 fbi->lcd_power(1);
254 }
255
256 static void imxfb_disable_controller(struct imxfb_info *fbi)
257 {
258         pr_debug("Disabling LCD controller\n");
259
260         if(fbi->backlight_power)
261                 fbi->backlight_power(0);
262         if(fbi->lcd_power)
263                 fbi->lcd_power(0);
264
265         LCDC_RMCR = 0;
266 }
267
268 static int imxfb_blank(int blank, struct fb_info *info)
269 {
270         struct imxfb_info *fbi = info->par;
271
272         pr_debug("imxfb_blank: blank=%d\n", blank);
273
274         switch (blank) {
275         case FB_BLANK_POWERDOWN:
276         case FB_BLANK_VSYNC_SUSPEND:
277         case FB_BLANK_HSYNC_SUSPEND:
278         case FB_BLANK_NORMAL:
279                 imxfb_disable_controller(fbi);
280                 break;
281
282         case FB_BLANK_UNBLANK:
283                 imxfb_enable_controller(fbi);
284                 break;
285         }
286         return 0;
287 }
288
289 static struct fb_ops imxfb_ops = {
290         .owner          = THIS_MODULE,
291         .fb_check_var   = imxfb_check_var,
292         .fb_set_par     = imxfb_set_par,
293         .fb_setcolreg   = imxfb_setcolreg,
294         .fb_fillrect    = cfb_fillrect,
295         .fb_copyarea    = cfb_copyarea,
296         .fb_imageblit   = cfb_imageblit,
297         .fb_blank       = imxfb_blank,
298 };
299
300 /*
301  * imxfb_activate_var():
302  *      Configures LCD Controller based on entries in var parameter.  Settings are
303  *      only written to the controller if changes were made.
304  */
305 static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info)
306 {
307         struct imxfb_info *fbi = info->par;
308         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
309                 var->xres, var->hsync_len,
310                 var->left_margin, var->right_margin);
311         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
312                 var->yres, var->vsync_len,
313                 var->upper_margin, var->lower_margin);
314
315 #if DEBUG_VAR
316         if (var->xres < 16        || var->xres > 1024)
317                 printk(KERN_ERR "%s: invalid xres %d\n",
318                         info->fix.id, var->xres);
319         if (var->hsync_len < 1    || var->hsync_len > 64)
320                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
321                         info->fix.id, var->hsync_len);
322         if (var->left_margin > 255)
323                 printk(KERN_ERR "%s: invalid left_margin %d\n",
324                         info->fix.id, var->left_margin);
325         if (var->right_margin > 255)
326                 printk(KERN_ERR "%s: invalid right_margin %d\n",
327                         info->fix.id, var->right_margin);
328         if (var->yres < 1 || var->yres > 511)
329                 printk(KERN_ERR "%s: invalid yres %d\n",
330                         info->fix.id, var->yres);
331         if (var->vsync_len > 100)
332                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
333                         info->fix.id, var->vsync_len);
334         if (var->upper_margin > 63)
335                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
336                         info->fix.id, var->upper_margin);
337         if (var->lower_margin > 255)
338                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
339                         info->fix.id, var->lower_margin);
340 #endif
341
342         LCDC_HCR        = HCR_H_WIDTH(var->hsync_len) |
343                           HCR_H_WAIT_1(var->left_margin) |
344                           HCR_H_WAIT_2(var->right_margin);
345
346         LCDC_VCR        = VCR_V_WIDTH(var->vsync_len) |
347                           VCR_V_WAIT_1(var->upper_margin) |
348                           VCR_V_WAIT_2(var->lower_margin);
349
350         LCDC_SIZE       = SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres);
351         LCDC_PCR        = fbi->pcr;
352         LCDC_PWMR       = fbi->pwmr;
353         LCDC_LSCR1      = fbi->lscr1;
354         LCDC_DMACR      = fbi->dmacr;
355
356         return 0;
357 }
358
359 static void imxfb_setup_gpio(struct imxfb_info *fbi)
360 {
361         int width;
362
363         LCDC_RMCR       &= ~(RMCR_LCDC_EN | RMCR_SELF_REF);
364
365         if( fbi->pcr & PCR_TFT )
366                 width = 16;
367         else
368                 width = 1 << ((fbi->pcr >> 28) & 0x3);
369
370         switch(width) {
371         case 16:
372                 imx_gpio_mode(PD30_PF_LD15);
373                 imx_gpio_mode(PD29_PF_LD14);
374                 imx_gpio_mode(PD28_PF_LD13);
375                 imx_gpio_mode(PD27_PF_LD12);
376                 imx_gpio_mode(PD26_PF_LD11);
377                 imx_gpio_mode(PD25_PF_LD10);
378                 imx_gpio_mode(PD24_PF_LD9);
379                 imx_gpio_mode(PD23_PF_LD8);
380         case 8:
381                 imx_gpio_mode(PD22_PF_LD7);
382                 imx_gpio_mode(PD21_PF_LD6);
383                 imx_gpio_mode(PD20_PF_LD5);
384                 imx_gpio_mode(PD19_PF_LD4);
385         case 4:
386                 imx_gpio_mode(PD18_PF_LD3);
387                 imx_gpio_mode(PD17_PF_LD2);
388         case 2:
389                 imx_gpio_mode(PD16_PF_LD1);
390         case 1:
391                 imx_gpio_mode(PD15_PF_LD0);
392         }
393
394         /* initialize GPIOs */
395         imx_gpio_mode(PD6_PF_LSCLK);
396         imx_gpio_mode(PD11_PF_CONTRAST);
397         imx_gpio_mode(PD14_PF_FLM_VSYNC);
398         imx_gpio_mode(PD13_PF_LP_HSYNC);
399         imx_gpio_mode(PD12_PF_ACD_OE);
400
401         /* These are only needed for Sharp HR TFT displays */
402         if (fbi->pcr & PCR_SHARP) {
403                 imx_gpio_mode(PD7_PF_REV);
404                 imx_gpio_mode(PD8_PF_CLS);
405                 imx_gpio_mode(PD9_PF_PS);
406                 imx_gpio_mode(PD10_PF_SPL_SPR);
407         }
408 }
409
410 #ifdef CONFIG_PM
411 /*
412  * Power management hooks.  Note that we won't be called from IRQ context,
413  * unlike the blank functions above, so we may sleep.
414  */
415 static int imxfb_suspend(struct platform_device *dev, pm_message_t state)
416 {
417         struct imxfb_info *fbi = platform_get_drvdata(dev);
418         pr_debug("%s\n",__FUNCTION__);
419
420         imxfb_disable_controller(fbi);
421         return 0;
422 }
423
424 static int imxfb_resume(struct platform_device *dev)
425 {
426         struct imxfb_info *fbi = platform_get_drvdata(dev);
427         pr_debug("%s\n",__FUNCTION__);
428
429         imxfb_enable_controller(fbi);
430         return 0;
431 }
432 #else
433 #define imxfb_suspend   NULL
434 #define imxfb_resume    NULL
435 #endif
436
437 static int __init imxfb_init_fbinfo(struct device *dev)
438 {
439         struct imxfb_mach_info *inf = dev->platform_data;
440         struct fb_info *info = dev_get_drvdata(dev);
441         struct imxfb_info *fbi = info->par;
442
443         pr_debug("%s\n",__FUNCTION__);
444
445         info->pseudo_palette = kmalloc( sizeof(u32) * 16, GFP_KERNEL);
446         if (!info->pseudo_palette)
447                 return -ENOMEM;
448
449         memset(fbi, 0, sizeof(struct imxfb_info));
450         fbi->dev = dev;
451
452         strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id));
453
454         info->fix.type  = FB_TYPE_PACKED_PIXELS;
455         info->fix.type_aux              = 0;
456         info->fix.xpanstep              = 0;
457         info->fix.ypanstep              = 0;
458         info->fix.ywrapstep             = 0;
459         info->fix.accel = FB_ACCEL_NONE;
460
461         info->var.nonstd                = 0;
462         info->var.activate              = FB_ACTIVATE_NOW;
463         info->var.height                = -1;
464         info->var.width = -1;
465         info->var.accel_flags           = 0;
466         info->var.vmode = FB_VMODE_NONINTERLACED;
467
468         info->fbops                     = &imxfb_ops;
469         info->flags                     = FBINFO_FLAG_DEFAULT | FBINFO_READS_FAST;
470
471         fbi->rgb[RGB_16]                = &def_rgb_16;
472         fbi->rgb[RGB_8]                 = &def_rgb_8;
473
474         fbi->max_xres                   = inf->xres;
475         info->var.xres                  = inf->xres;
476         info->var.xres_virtual          = inf->xres;
477         fbi->max_yres                   = inf->yres;
478         info->var.yres                  = inf->yres;
479         info->var.yres_virtual          = inf->yres;
480         fbi->max_bpp                    = inf->bpp;
481         info->var.bits_per_pixel        = inf->bpp;
482         info->var.nonstd                = inf->nonstd;
483         info->var.pixclock              = inf->pixclock;
484         info->var.hsync_len             = inf->hsync_len;
485         info->var.left_margin           = inf->left_margin;
486         info->var.right_margin          = inf->right_margin;
487         info->var.vsync_len             = inf->vsync_len;
488         info->var.upper_margin          = inf->upper_margin;
489         info->var.lower_margin          = inf->lower_margin;
490         info->var.sync                  = inf->sync;
491         info->var.grayscale             = inf->cmap_greyscale;
492         fbi->cmap_inverse               = inf->cmap_inverse;
493         fbi->cmap_static                = inf->cmap_static;
494         fbi->pcr                        = inf->pcr;
495         fbi->lscr1                      = inf->lscr1;
496         fbi->dmacr                      = inf->dmacr;
497         fbi->pwmr                       = inf->pwmr;
498         fbi->lcd_power                  = inf->lcd_power;
499         fbi->backlight_power            = inf->backlight_power;
500         info->fix.smem_len              = fbi->max_xres * fbi->max_yres *
501                                           fbi->max_bpp / 8;
502
503         return 0;
504 }
505
506 /*
507  *      Allocates the DRAM memory for the frame buffer.  This buffer is
508  *      remapped into a non-cached, non-buffered, memory region to
509  *      allow pixel writes to occur without flushing the cache.
510  *      Once this area is remapped, all virtual memory access to the
511  *      video memory should occur at the new region.
512  */
513 static int __init imxfb_map_video_memory(struct fb_info *info)
514 {
515         struct imxfb_info *fbi = info->par;
516
517         fbi->map_size = PAGE_ALIGN(info->fix.smem_len);
518         fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
519                                         &fbi->map_dma,GFP_KERNEL);
520
521         if (fbi->map_cpu) {
522                 info->screen_base = fbi->map_cpu;
523                 fbi->screen_cpu = fbi->map_cpu;
524                 fbi->screen_dma = fbi->map_dma;
525                 info->fix.smem_start = fbi->screen_dma;
526         }
527
528         return fbi->map_cpu ? 0 : -ENOMEM;
529 }
530
531 static int __init imxfb_probe(struct platform_device *pdev)
532 {
533         struct imxfb_info *fbi;
534         struct fb_info *info;
535         struct imxfb_mach_info *inf;
536         struct resource *res;
537         int ret;
538
539         printk("i.MX Framebuffer driver\n");
540
541         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
542         if(!res)
543                 return -ENODEV;
544
545         inf = pdev->dev.platform_data;
546         if(!inf) {
547                 dev_err(&pdev->dev,"No platform_data available\n");
548                 return -ENOMEM;
549         }
550
551         info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev);
552         if(!info)
553                 return -ENOMEM;
554
555         fbi = info->par;
556
557         platform_set_drvdata(pdev, info);
558
559         ret = imxfb_init_fbinfo(&pdev->dev);
560         if( ret < 0 )
561                 goto failed_init;
562
563         res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB");
564         if (!res) {
565                 ret = -EBUSY;
566                 goto failed_regs;
567         }
568
569         if (!inf->fixed_screen_cpu) {
570                 ret = imxfb_map_video_memory(info);
571                 if (ret) {
572                         dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
573                         ret = -ENOMEM;
574                         goto failed_map;
575                 }
576         } else {
577                 /* Fixed framebuffer mapping enables location of the screen in eSRAM */
578                 fbi->map_cpu = inf->fixed_screen_cpu;
579                 fbi->map_dma = inf->fixed_screen_dma;
580                 info->screen_base = fbi->map_cpu;
581                 fbi->screen_cpu = fbi->map_cpu;
582                 fbi->screen_dma = fbi->map_dma;
583                 info->fix.smem_start = fbi->screen_dma;
584         }
585
586         /*
587          * This makes sure that our colour bitfield
588          * descriptors are correctly initialised.
589          */
590         imxfb_check_var(&info->var, info);
591
592         ret = fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0);
593         if (ret < 0)
594                 goto failed_cmap;
595
596         imxfb_setup_gpio(fbi);
597
598         imxfb_set_par(info);
599         ret = register_framebuffer(info);
600         if (ret < 0) {
601                 dev_err(&pdev->dev, "failed to register framebuffer\n");
602                 goto failed_register;
603         }
604
605         imxfb_enable_controller(fbi);
606
607         return 0;
608
609 failed_register:
610         fb_dealloc_cmap(&info->cmap);
611 failed_cmap:
612         if (!inf->fixed_screen_cpu)
613                 dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu,
614                            fbi->map_dma);
615 failed_map:
616         kfree(info->pseudo_palette);
617 failed_regs:
618         release_mem_region(res->start, res->end - res->start);
619 failed_init:
620         platform_set_drvdata(pdev, NULL);
621         framebuffer_release(info);
622         return ret;
623 }
624
625 static int imxfb_remove(struct platform_device *pdev)
626 {
627         struct fb_info *info = platform_get_drvdata(pdev);
628         struct imxfb_info *fbi = info->par;
629         struct resource *res;
630
631         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
632
633         imxfb_disable_controller(fbi);
634
635         unregister_framebuffer(info);
636
637         fb_dealloc_cmap(&info->cmap);
638         kfree(info->pseudo_palette);
639         framebuffer_release(info);
640
641         release_mem_region(res->start, res->end - res->start + 1);
642         platform_set_drvdata(pdev, NULL);
643
644         return 0;
645 }
646
647 void  imxfb_shutdown(struct platform_device * dev)
648 {
649         struct fb_info *info = platform_get_drvdata(dev);
650         struct imxfb_info *fbi = info->par;
651         imxfb_disable_controller(fbi);
652 }
653
654 static struct platform_driver imxfb_driver = {
655         .probe          = imxfb_probe,
656         .suspend        = imxfb_suspend,
657         .resume         = imxfb_resume,
658         .remove         = imxfb_remove,
659         .shutdown       = imxfb_shutdown,
660         .driver         = {
661                 .name   = "imx-fb",
662         },
663 };
664
665 int __init imxfb_init(void)
666 {
667         return platform_driver_register(&imxfb_driver);
668 }
669
670 static void __exit imxfb_cleanup(void)
671 {
672         platform_driver_unregister(&imxfb_driver);
673 }
674
675 module_init(imxfb_init);
676 module_exit(imxfb_cleanup);
677
678 MODULE_DESCRIPTION("Motorola i.MX framebuffer driver");
679 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
680 MODULE_LICENSE("GPL");