fb: fix au1100fb bitrot.
[sitara-epos/sitara-epos-kernel.git] / drivers / video / au1100fb.c
1 /*
2  * BRIEF MODULE DESCRIPTION
3  *      Au1100 LCD Driver.
4  *
5  * Rewritten for 2.6 by Embedded Alley Solutions
6  *      <source@embeddedalley.com>, based on submissions by
7  *      Karl Lessard <klessard@sunrisetelecom.com>
8  *      <c.pellegrin@exadron.com>
9  *
10  * PM support added by Rodolfo Giometti <giometti@linux.it>
11  * Cursor enable/disable by Rodolfo Giometti <giometti@linux.it>
12  *
13  * Copyright 2002 MontaVista Software
14  * Author: MontaVista Software, Inc.
15  *              ppopov@mvista.com or source@mvista.com
16  *
17  * Copyright 2002 Alchemy Semiconductor
18  * Author: Alchemy Semiconductor
19  *
20  * Based on:
21  * linux/drivers/video/skeletonfb.c -- Skeleton for a frame buffer device
22  *  Created 28 Dec 1997 by Geert Uytterhoeven
23  *
24  *  This program is free software; you can redistribute  it and/or modify it
25  *  under  the terms of  the GNU General  Public License as published by the
26  *  Free Software Foundation;  either version 2 of the  License, or (at your
27  *  option) any later version.
28  *
29  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
30  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
31  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
32  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
33  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
34  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
35  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
36  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
37  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
38  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
39  *
40  *  You should have received a copy of the  GNU General Public License along
41  *  with this program; if not, write  to the Free Software Foundation, Inc.,
42  *  675 Mass Ave, Cambridge, MA 02139, USA.
43  */
44 #include <linux/module.h>
45 #include <linux/kernel.h>
46 #include <linux/errno.h>
47 #include <linux/string.h>
48 #include <linux/mm.h>
49 #include <linux/fb.h>
50 #include <linux/init.h>
51 #include <linux/interrupt.h>
52 #include <linux/ctype.h>
53 #include <linux/dma-mapping.h>
54 #include <linux/platform_device.h>
55 #include <linux/slab.h>
57 #include <asm/mach-au1x00/au1000.h>
59 #define DEBUG 0
61 #include "au1100fb.h"
63 /*
64  * Sanity check. If this is a new Au1100 based board, search for
65  * the PB1100 ifdefs to make sure you modify the code accordingly.
66  */
67 #if defined(CONFIG_MIPS_PB1100)
68   #include <asm/mach-pb1x00/pb1100.h>
69 #elif defined(CONFIG_MIPS_DB1100)
70   #include <asm/mach-db1x00/db1x00.h>
71 #else
72   #error "Unknown Au1100 board, Au1100 FB driver not supported"
73 #endif
75 #define DRIVER_NAME "au1100fb"
76 #define DRIVER_DESC "LCD controller driver for AU1100 processors"
78 #define to_au1100fb_device(_info) \
79           (_info ? container_of(_info, struct au1100fb_device, info) : NULL);
81 /* Bitfields format supported by the controller. Note that the order of formats
82  * SHOULD be the same as in the LCD_CONTROL_SBPPF field, so we can retrieve the
83  * right pixel format by doing rgb_bitfields[LCD_CONTROL_SBPPF_XXX >> LCD_CONTROL_SBPPF]
84  */
85 struct fb_bitfield rgb_bitfields[][4] =
86 {
87         /*     Red,        Green,        Blue,       Transp   */
88         { { 10, 6, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
89         { { 11, 5, 0 }, { 5, 6, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
90         { { 11, 5, 0 }, { 6, 5, 0 }, { 0, 6, 0 }, { 0, 0, 0 } },
91         { { 10, 5, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 15, 1, 0 } },
92         { { 11, 5, 0 }, { 6, 5, 0 }, { 1, 5, 0 }, { 0, 1, 0 } },
94         /* The last is used to describe 12bpp format */
95         { { 8, 4, 0 },  { 4, 4, 0 }, { 0, 4, 0 }, { 0, 0, 0 } },
96 };
98 static struct fb_fix_screeninfo au1100fb_fix __devinitdata = {
99         .id             = "AU1100 FB",
100         .xpanstep       = 1,
101         .ypanstep       = 1,
102         .type           = FB_TYPE_PACKED_PIXELS,
103         .accel          = FB_ACCEL_NONE,
104 };
106 static struct fb_var_screeninfo au1100fb_var __devinitdata = {
107         .activate       = FB_ACTIVATE_NOW,
108         .height         = -1,
109         .width          = -1,
110         .vmode          = FB_VMODE_NONINTERLACED,
111 };
113 /* fb_blank
114  * Blank the screen. Depending on the mode, the screen will be
115  * activated with the backlight color, or desactivated
116  */
117 static int au1100fb_fb_blank(int blank_mode, struct fb_info *fbi)
119         struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
121         print_dbg("fb_blank %d %p", blank_mode, fbi);
123         switch (blank_mode) {
125         case VESA_NO_BLANKING:
126                         /* Turn on panel */
127                         fbdev->regs->lcd_control |= LCD_CONTROL_GO;
128 #ifdef CONFIG_MIPS_PB1100
129                         if (fbdev->panel_idx == 1) {
130                                 au_writew(au_readw(PB1100_G_CONTROL)
131                                           | (PB1100_G_CONTROL_BL | PB1100_G_CONTROL_VDD),
132                         PB1100_G_CONTROL);
133                         }
134 #endif
135                 au_sync();
136                 break;
138         case VESA_VSYNC_SUSPEND:
139         case VESA_HSYNC_SUSPEND:
140         case VESA_POWERDOWN:
141                         /* Turn off panel */
142                         fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
143 #ifdef CONFIG_MIPS_PB1100
144                         if (fbdev->panel_idx == 1) {
145                                 au_writew(au_readw(PB1100_G_CONTROL)
146                                           & ~(PB1100_G_CONTROL_BL | PB1100_G_CONTROL_VDD),
147                         PB1100_G_CONTROL);
148                         }
149 #endif
150                 au_sync();
151                 break;
152         default:
153                 break;
155         }
156         return 0;
159 /*
160  * Set hardware with var settings. This will enable the controller with a specific
161  * mode, normally validated with the fb_check_var method
162          */
163 int au1100fb_setmode(struct au1100fb_device *fbdev)
165         struct fb_info *info = &fbdev->info;
166         u32 words;
167         int index;
169         if (!fbdev)
170                 return -EINVAL;
172         /* Update var-dependent FB info */
173         if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {
174                 if (info->var.bits_per_pixel <= 8) {
175                         /* palettized */
176                         info->var.red.offset    = 0;
177                         info->var.red.length    = info->var.bits_per_pixel;
178                         info->var.red.msb_right = 0;
180                         info->var.green.offset  = 0;
181                         info->var.green.length  = info->var.bits_per_pixel;
182                         info->var.green.msb_right = 0;
184                         info->var.blue.offset   = 0;
185                         info->var.blue.length   = info->var.bits_per_pixel;
186                         info->var.blue.msb_right = 0;
188                         info->var.transp.offset = 0;
189                         info->var.transp.length = 0;
190                         info->var.transp.msb_right = 0;
192                         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
193                         info->fix.line_length = info->var.xres_virtual /
194                                                         (8/info->var.bits_per_pixel);
195                 } else {
196                         /* non-palettized */
197                         index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;
198                         info->var.red = rgb_bitfields[index][0];
199                         info->var.green = rgb_bitfields[index][1];
200                         info->var.blue = rgb_bitfields[index][2];
201                         info->var.transp = rgb_bitfields[index][3];
203                         info->fix.visual = FB_VISUAL_TRUECOLOR;
204                         info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */
205                 }
206         } else {
207                 /* mono */
208                 info->fix.visual = FB_VISUAL_MONO10;
209                 info->fix.line_length = info->var.xres_virtual / 8;
210         }
212         info->screen_size = info->fix.line_length * info->var.yres_virtual;
213         info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \
214                                 >> LCD_CONTROL_SM_BIT) * 90;
216         /* Determine BPP mode and format */
217         fbdev->regs->lcd_control = fbdev->panel->control_base;
218         fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;
219         fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;
220         fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;
221         fbdev->regs->lcd_intenable = 0;
222         fbdev->regs->lcd_intstatus = 0;
223         fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);
225         if (panel_is_dual(fbdev->panel)) {
226                 /* Second panel display seconf half of screen if possible,
227                  * otherwise display the same as the first panel */
228                 if (info->var.yres_virtual >= (info->var.yres << 1)) {
229                         fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +
230                                                           (info->fix.line_length *
231                                                           (info->var.yres_virtual >> 1)));
232                 } else {
233                         fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);
234                 }
235         }
237         words = info->fix.line_length / sizeof(u32);
238         if (!info->var.rotate || (info->var.rotate == 180)) {
239                 words *= info->var.yres_virtual;
240                 if (info->var.rotate /* 180 */) {
241                         words -= (words % 8); /* should be divisable by 8 */
242                 }
243         }
244         fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);
246         fbdev->regs->lcd_pwmdiv = 0;
247         fbdev->regs->lcd_pwmhi = 0;
249         /* Resume controller */
250         fbdev->regs->lcd_control |= LCD_CONTROL_GO;
251         mdelay(10);
252         au1100fb_fb_blank(VESA_NO_BLANKING, info);
254         return 0;
257 /* fb_setcolreg
258  * Set color in LCD palette.
259  */
260 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
262         struct au1100fb_device *fbdev;
263         u32 *palette;
264         u32 value;
266         fbdev = to_au1100fb_device(fbi);
267         palette = fbdev->regs->lcd_pallettebase;
269         if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))
270                 return -EINVAL;
272         if (fbi->var.grayscale) {
273                 /* Convert color to grayscale */
274                 red = green = blue =
275                         (19595 * red + 38470 * green + 7471 * blue) >> 16;
276         }
278         if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {
279                 /* Place color in the pseudopalette */
280                 if (regno > 16)
281                         return -EINVAL;
283                 palette = (u32*)fbi->pseudo_palette;
285                 red   >>= (16 - fbi->var.red.length);
286                 green >>= (16 - fbi->var.green.length);
287                 blue  >>= (16 - fbi->var.blue.length);
289                 value = (red   << fbi->var.red.offset)  |
290                         (green << fbi->var.green.offset)|
291                         (blue  << fbi->var.blue.offset);
292                 value &= 0xFFFF;
294         } else if (panel_is_active(fbdev->panel)) {
295                 /* COLOR TFT PALLETTIZED (use RGB 565) */
296                 value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);
297                 value &= 0xFFFF;
299         } else if (panel_is_color(fbdev->panel)) {
300                 /* COLOR STN MODE */
301                 value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |
302                         ((green >> 8) & 0x00F0) |
303                         (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);
304                 value &= 0xFFF;
305         } else {
306                 /* MONOCHROME MODE */
307                 value = (green >> 12) & 0x000F;
308                 value &= 0xF;
309         }
311         palette[regno] = value;
313         return 0;
316 /* fb_pan_display
317  * Pan display in x and/or y as specified
318  */
319 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
321         struct au1100fb_device *fbdev;
322         int dy;
324         fbdev = to_au1100fb_device(fbi);
326         print_dbg("fb_pan_display %p %p", var, fbi);
328         if (!var || !fbdev) {
329                 return -EINVAL;
330         }
332         if (var->xoffset - fbi->var.xoffset) {
333                 /* No support for X panning for now! */
334                 return -EINVAL;
335         }
337         print_dbg("fb_pan_display 2 %p %p", var, fbi);
338         dy = var->yoffset - fbi->var.yoffset;
339         if (dy) {
341                 u32 dmaaddr;
343                 print_dbg("Panning screen of %d lines", dy);
345                 dmaaddr = fbdev->regs->lcd_dmaaddr0;
346                 dmaaddr += (fbi->fix.line_length * dy);
348                 /* TODO: Wait for current frame to finished */
349                 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
351                 if (panel_is_dual(fbdev->panel)) {
352                         dmaaddr = fbdev->regs->lcd_dmaaddr1;
353                         dmaaddr += (fbi->fix.line_length * dy);
354                         fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
355         }
356         }
357         print_dbg("fb_pan_display 3 %p %p", var, fbi);
359         return 0;
362 /* fb_rotate
363  * Rotate the display of this angle. This doesn't seems to be used by the core,
364  * but as our hardware supports it, so why not implementing it...
365  */
366 void au1100fb_fb_rotate(struct fb_info *fbi, int angle)
368         struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
370         print_dbg("fb_rotate %p %d", fbi, angle);
372         if (fbdev && (angle > 0) && !(angle % 90)) {
374                 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
376                 fbdev->regs->lcd_control &= ~(LCD_CONTROL_SM_MASK);
377                 fbdev->regs->lcd_control |= ((angle/90) << LCD_CONTROL_SM_BIT);
379                 fbdev->regs->lcd_control |= LCD_CONTROL_GO;
380         }
383 /* fb_mmap
384  * Map video memory in user space. We don't use the generic fb_mmap method mainly
385  * to allow the use of the TLB streaming flag (CCA=6)
386  */
387 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
389         struct au1100fb_device *fbdev;
390         unsigned int len;
391         unsigned long start=0, off;
393         fbdev = to_au1100fb_device(fbi);
395         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) {
396                 return -EINVAL;
397         }
399         start = fbdev->fb_phys & PAGE_MASK;
400         len = PAGE_ALIGN((start & ~PAGE_MASK) + fbdev->fb_len);
402         off = vma->vm_pgoff << PAGE_SHIFT;
404         if ((vma->vm_end - vma->vm_start + off) > len) {
405                 return -EINVAL;
406         }
408         off += start;
409         vma->vm_pgoff = off >> PAGE_SHIFT;
411         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
412         pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
414         vma->vm_flags |= VM_IO;
416         if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
417                                 vma->vm_end - vma->vm_start,
418                                 vma->vm_page_prot)) {
419                 return -EAGAIN;
420         }
422         return 0;
425 static struct fb_ops au1100fb_ops =
427         .owner                  = THIS_MODULE,
428         .fb_setcolreg           = au1100fb_fb_setcolreg,
429         .fb_blank               = au1100fb_fb_blank,
430         .fb_pan_display         = au1100fb_fb_pan_display,
431         .fb_fillrect            = cfb_fillrect,
432         .fb_copyarea            = cfb_copyarea,
433         .fb_imageblit           = cfb_imageblit,
434         .fb_rotate              = au1100fb_fb_rotate,
435         .fb_mmap                = au1100fb_fb_mmap,
436 };
439 /*-------------------------------------------------------------------------*/
441 static int au1100fb_setup(struct au1100fb_device *fbdev)
443         char *this_opt, *options;
444         int num_panels = ARRAY_SIZE(known_lcd_panels);
446         if (num_panels <= 0) {
447                 print_err("No LCD panels supported by driver!");
448                 return -ENODEV;
449         }
451         if (fb_get_options(DRIVER_NAME, &options))
452                 return -ENODEV;
453         if (!options)
454                 return -ENODEV;
456         while ((this_opt = strsep(&options, ",")) != NULL) {
457                 /* Panel option */
458                 if (!strncmp(this_opt, "panel:", 6)) {
459                         int i;
460                         this_opt += 6;
461                         for (i = 0; i < num_panels; i++) {
462                                 if (!strncmp(this_opt, known_lcd_panels[i].name,
463                                              strlen(this_opt))) {
464                                         fbdev->panel = &known_lcd_panels[i];
465                                         fbdev->panel_idx = i;
466                                         break;
467                                 }
468                         }
469                         if (i >= num_panels) {
470                                 print_warn("Panel '%s' not supported!", this_opt);
471                                 return -ENODEV;
472                         }
473                 }
474                 /* Unsupported option */
475                 else
476                         print_warn("Unsupported option \"%s\"", this_opt);
477         }
479         print_info("Panel=%s", fbdev->panel->name);
481         return 0;
484 static int __devinit au1100fb_drv_probe(struct platform_device *dev)
486         struct au1100fb_device *fbdev = NULL;
487         struct resource *regs_res;
488         unsigned long page;
489         u32 sys_clksrc;
491         /* Allocate new device private */
492         fbdev = kzalloc(sizeof(struct au1100fb_device), GFP_KERNEL);
493         if (!fbdev) {
494                 print_err("fail to allocate device private record");
495                 return -ENOMEM;
496         }
498         if (au1100fb_setup(fbdev))
499                 goto failed;
501         platform_set_drvdata(dev, (void *)fbdev);
503         /* Allocate region for our registers and map them */
504         regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
505         if (!regs_res) {
506                 print_err("fail to retrieve registers resource");
507                 return -EFAULT;
508         }
510         au1100fb_fix.mmio_start = regs_res->start;
511         au1100fb_fix.mmio_len = resource_size(regs_res);
513         if (!request_mem_region(au1100fb_fix.mmio_start, au1100fb_fix.mmio_len,
514                                 DRIVER_NAME)) {
515                 print_err("fail to lock memory region at 0x%08lx",
516                                 au1100fb_fix.mmio_start);
517                 return -EBUSY;
518         }
520         fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);
522         print_dbg("Register memory map at %p", fbdev->regs);
523         print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
525         /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
526         fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
527                         (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
529         fbdev->fb_mem = dma_alloc_coherent(&dev->dev, PAGE_ALIGN(fbdev->fb_len),
530                                         &fbdev->fb_phys, GFP_KERNEL);
531         if (!fbdev->fb_mem) {
532                 print_err("fail to allocate frambuffer (size: %dK))",
533                           fbdev->fb_len / 1024);
534                 return -ENOMEM;
535         }
537         au1100fb_fix.smem_start = fbdev->fb_phys;
538         au1100fb_fix.smem_len = fbdev->fb_len;
540         /*
541          * Set page reserved so that mmap will work. This is necessary
542          * since we'll be remapping normal memory.
543          */
544         for (page = (unsigned long)fbdev->fb_mem;
545              page < PAGE_ALIGN((unsigned long)fbdev->fb_mem + fbdev->fb_len);
546              page += PAGE_SIZE) {
547 #if CONFIG_DMA_NONCOHERENT
548                 SetPageReserved(virt_to_page(CAC_ADDR((void *)page)));
549 #else
550                 SetPageReserved(virt_to_page(page));
551 #endif
552         }
554         print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
555         print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
557         /* Setup LCD clock to AUX (48 MHz) */
558         sys_clksrc = au_readl(SYS_CLKSRC) & ~(SYS_CS_ML_MASK | SYS_CS_DL | SYS_CS_CL);
559         au_writel((sys_clksrc | (1 << SYS_CS_ML_BIT)), SYS_CLKSRC);
561         /* load the panel info into the var struct */
562         au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
563         au1100fb_var.xres = fbdev->panel->xres;
564         au1100fb_var.xres_virtual = au1100fb_var.xres;
565         au1100fb_var.yres = fbdev->panel->yres;
566         au1100fb_var.yres_virtual = au1100fb_var.yres;
568         fbdev->info.screen_base = fbdev->fb_mem;
569         fbdev->info.fbops = &au1100fb_ops;
570         fbdev->info.fix = au1100fb_fix;
572         if (!(fbdev->info.pseudo_palette = kzalloc(sizeof(u32) * 16, GFP_KERNEL))) {
573                 return -ENOMEM;
574         }
576         if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
577                 print_err("Fail to allocate colormap (%d entries)",
578                            AU1100_LCD_NBR_PALETTE_ENTRIES);
579                 kfree(fbdev->info.pseudo_palette);
580                 return -EFAULT;
581         }
583         fbdev->info.var = au1100fb_var;
585         /* Set h/w registers */
586         au1100fb_setmode(fbdev);
588         /* Register new framebuffer */
589         if (register_framebuffer(&fbdev->info) < 0) {
590                 print_err("cannot register new framebuffer");
591                 goto failed;
592         }
594         return 0;
596 failed:
597         if (fbdev->regs) {
598                 release_mem_region(fbdev->regs_phys, fbdev->regs_len);
599         }
600         if (fbdev->fb_mem) {
601                 dma_free_noncoherent(&dev->dev, fbdev->fb_len, fbdev->fb_mem,
602                                      fbdev->fb_phys);
603         }
604         if (fbdev->info.cmap.len != 0) {
605                 fb_dealloc_cmap(&fbdev->info.cmap);
606         }
607         kfree(fbdev);
608         platform_set_drvdata(dev, NULL);
610         return 0;
613 int au1100fb_drv_remove(struct platform_device *dev)
615         struct au1100fb_device *fbdev = NULL;
617         if (!dev)
618                 return -ENODEV;
620         fbdev = (struct au1100fb_device *) platform_get_drvdata(dev);
622 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
623         au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
624 #endif
625         fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
627         /* Clean up all probe data */
628         unregister_framebuffer(&fbdev->info);
630         release_mem_region(fbdev->regs_phys, fbdev->regs_len);
632         dma_free_coherent(&dev->dev, PAGE_ALIGN(fbdev->fb_len), fbdev->fb_mem,
633                           fbdev->fb_phys);
635         fb_dealloc_cmap(&fbdev->info.cmap);
636         kfree(fbdev->info.pseudo_palette);
637         kfree((void*)fbdev);
639         return 0;
642 #ifdef CONFIG_PM
643 static u32 sys_clksrc;
644 static struct au1100fb_regs fbregs;
646 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
648         struct au1100fb_device *fbdev = platform_get_drvdata(dev);
650         if (!fbdev)
651                 return 0;
653         /* Save the clock source state */
654         sys_clksrc = au_readl(SYS_CLKSRC);
656         /* Blank the LCD */
657         au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
659         /* Stop LCD clocking */
660         au_writel(sys_clksrc & ~SYS_CS_ML_MASK, SYS_CLKSRC);
662         memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
664         return 0;
667 int au1100fb_drv_resume(struct platform_device *dev)
669         struct au1100fb_device *fbdev = platform_get_drvdata(dev);
671         if (!fbdev)
672                 return 0;
674         memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
676         /* Restart LCD clocking */
677         au_writel(sys_clksrc, SYS_CLKSRC);
679         /* Unblank the LCD */
680         au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
682         return 0;
684 #else
685 #define au1100fb_drv_suspend NULL
686 #define au1100fb_drv_resume NULL
687 #endif
689 static struct platform_driver au1100fb_driver = {
690         .driver = {
691                 .name           = "au1100-lcd",
692                 .owner          = THIS_MODULE,
693         },
694         .probe          = au1100fb_drv_probe,
695         .remove         = au1100fb_drv_remove,
696         .suspend        = au1100fb_drv_suspend,
697         .resume         = au1100fb_drv_resume,
698 };
700 static int __init au1100fb_load(void)
702         return platform_driver_register(&au1100fb_driver);
705 static void __exit au1100fb_unload(void)
707         platform_driver_unregister(&au1100fb_driver);
710 module_init(au1100fb_load);
711 module_exit(au1100fb_unload);
713 MODULE_DESCRIPTION(DRIVER_DESC);
714 MODULE_LICENSE("GPL");