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au1100fb.c
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1 /*
2  * BRIEF MODULE DESCRIPTION
3  * Au1100 LCD Driver.
4  *
5  * Rewritten for 2.6 by Embedded Alley Solutions
6  * <[email protected]>, based on submissions by
7  * Karl Lessard <[email protected]>
8  * <[email protected]>
9  *
10  * PM support added by Rodolfo Giometti <[email protected]>
11  * Cursor enable/disable by Rodolfo Giometti <[email protected]>
12  *
13  * Copyright 2002 MontaVista Software
14  * Author: MontaVista Software, Inc.
15  * [email protected] or [email protected]
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>
56 
57 #include <asm/mach-au1x00/au1000.h>
58 
59 #define DEBUG 0
60 
61 #include "au1100fb.h"
62 
63 #define DRIVER_NAME "au1100fb"
64 #define DRIVER_DESC "LCD controller driver for AU1100 processors"
65 
66 #define to_au1100fb_device(_info) \
67  (_info ? container_of(_info, struct au1100fb_device, info) : NULL);
68 
69 /* Bitfields format supported by the controller. Note that the order of formats
70  * SHOULD be the same as in the LCD_CONTROL_SBPPF field, so we can retrieve the
71  * right pixel format by doing rgb_bitfields[LCD_CONTROL_SBPPF_XXX >> LCD_CONTROL_SBPPF]
72  */
73 struct fb_bitfield rgb_bitfields[][4] =
74 {
75  /* Red, Green, Blue, Transp */
76  { { 10, 6, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
77  { { 11, 5, 0 }, { 5, 6, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
78  { { 11, 5, 0 }, { 6, 5, 0 }, { 0, 6, 0 }, { 0, 0, 0 } },
79  { { 10, 5, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 15, 1, 0 } },
80  { { 11, 5, 0 }, { 6, 5, 0 }, { 1, 5, 0 }, { 0, 1, 0 } },
81 
82  /* The last is used to describe 12bpp format */
83  { { 8, 4, 0 }, { 4, 4, 0 }, { 0, 4, 0 }, { 0, 0, 0 } },
84 };
85 
86 static struct fb_fix_screeninfo au1100fb_fix __devinitdata = {
87  .id = "AU1100 FB",
88  .xpanstep = 1,
89  .ypanstep = 1,
90  .type = FB_TYPE_PACKED_PIXELS,
91  .accel = FB_ACCEL_NONE,
92 };
93 
94 static struct fb_var_screeninfo au1100fb_var __devinitdata = {
95  .activate = FB_ACTIVATE_NOW,
96  .height = -1,
97  .width = -1,
98  .vmode = FB_VMODE_NONINTERLACED,
99 };
100 
101 /* fb_blank
102  * Blank the screen. Depending on the mode, the screen will be
103  * activated with the backlight color, or desactivated
104  */
105 static int au1100fb_fb_blank(int blank_mode, struct fb_info *fbi)
106 {
107  struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
108 
109  print_dbg("fb_blank %d %p", blank_mode, fbi);
110 
111  switch (blank_mode) {
112 
113  case VESA_NO_BLANKING:
114  /* Turn on panel */
115  fbdev->regs->lcd_control |= LCD_CONTROL_GO;
116 #ifdef CONFIG_MIPS_PB1100
117  if (fbdev->panel_idx == 1) {
118  au_writew(au_readw(PB1100_G_CONTROL)
119  | (PB1100_G_CONTROL_BL | PB1100_G_CONTROL_VDD),
120  PB1100_G_CONTROL);
121  }
122 #endif
123  au_sync();
124  break;
125 
126  case VESA_VSYNC_SUSPEND:
127  case VESA_HSYNC_SUSPEND:
128  case VESA_POWERDOWN:
129  /* Turn off panel */
130  fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
131 #ifdef CONFIG_MIPS_PB1100
132  if (fbdev->panel_idx == 1) {
133  au_writew(au_readw(PB1100_G_CONTROL)
134  & ~(PB1100_G_CONTROL_BL | PB1100_G_CONTROL_VDD),
135  PB1100_G_CONTROL);
136  }
137 #endif
138  au_sync();
139  break;
140  default:
141  break;
142 
143  }
144  return 0;
145 }
146 
147 /*
148  * Set hardware with var settings. This will enable the controller with a specific
149  * mode, normally validated with the fb_check_var method
150  */
151 int au1100fb_setmode(struct au1100fb_device *fbdev)
152 {
153  struct fb_info *info = &fbdev->info;
154  u32 words;
155  int index;
156 
157  if (!fbdev)
158  return -EINVAL;
159 
160  /* Update var-dependent FB info */
161  if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {
162  if (info->var.bits_per_pixel <= 8) {
163  /* palettized */
164  info->var.red.offset = 0;
165  info->var.red.length = info->var.bits_per_pixel;
166  info->var.red.msb_right = 0;
167 
168  info->var.green.offset = 0;
169  info->var.green.length = info->var.bits_per_pixel;
170  info->var.green.msb_right = 0;
171 
172  info->var.blue.offset = 0;
173  info->var.blue.length = info->var.bits_per_pixel;
174  info->var.blue.msb_right = 0;
175 
176  info->var.transp.offset = 0;
177  info->var.transp.length = 0;
178  info->var.transp.msb_right = 0;
179 
180  info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
181  info->fix.line_length = info->var.xres_virtual /
182  (8/info->var.bits_per_pixel);
183  } else {
184  /* non-palettized */
185  index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;
186  info->var.red = rgb_bitfields[index][0];
187  info->var.green = rgb_bitfields[index][1];
188  info->var.blue = rgb_bitfields[index][2];
189  info->var.transp = rgb_bitfields[index][3];
190 
191  info->fix.visual = FB_VISUAL_TRUECOLOR;
192  info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */
193  }
194  } else {
195  /* mono */
196  info->fix.visual = FB_VISUAL_MONO10;
197  info->fix.line_length = info->var.xres_virtual / 8;
198  }
199 
200  info->screen_size = info->fix.line_length * info->var.yres_virtual;
201  info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \
202  >> LCD_CONTROL_SM_BIT) * 90;
203 
204  /* Determine BPP mode and format */
205  fbdev->regs->lcd_control = fbdev->panel->control_base;
206  fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;
207  fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;
208  fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;
209  fbdev->regs->lcd_intenable = 0;
210  fbdev->regs->lcd_intstatus = 0;
211  fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);
212 
213  if (panel_is_dual(fbdev->panel)) {
214  /* Second panel display seconf half of screen if possible,
215  * otherwise display the same as the first panel */
216  if (info->var.yres_virtual >= (info->var.yres << 1)) {
217  fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +
218  (info->fix.line_length *
219  (info->var.yres_virtual >> 1)));
220  } else {
221  fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);
222  }
223  }
224 
225  words = info->fix.line_length / sizeof(u32);
226  if (!info->var.rotate || (info->var.rotate == 180)) {
227  words *= info->var.yres_virtual;
228  if (info->var.rotate /* 180 */) {
229  words -= (words % 8); /* should be divisable by 8 */
230  }
231  }
232  fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);
233 
234  fbdev->regs->lcd_pwmdiv = 0;
235  fbdev->regs->lcd_pwmhi = 0;
236 
237  /* Resume controller */
238  fbdev->regs->lcd_control |= LCD_CONTROL_GO;
239  mdelay(10);
240  au1100fb_fb_blank(VESA_NO_BLANKING, info);
241 
242  return 0;
243 }
244 
245 /* fb_setcolreg
246  * Set color in LCD palette.
247  */
248 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
249 {
250  struct au1100fb_device *fbdev;
251  u32 *palette;
252  u32 value;
253 
254  fbdev = to_au1100fb_device(fbi);
255  palette = fbdev->regs->lcd_pallettebase;
256 
257  if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))
258  return -EINVAL;
259 
260  if (fbi->var.grayscale) {
261  /* Convert color to grayscale */
262  red = green = blue =
263  (19595 * red + 38470 * green + 7471 * blue) >> 16;
264  }
265 
266  if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {
267  /* Place color in the pseudopalette */
268  if (regno > 16)
269  return -EINVAL;
270 
271  palette = (u32*)fbi->pseudo_palette;
272 
273  red >>= (16 - fbi->var.red.length);
274  green >>= (16 - fbi->var.green.length);
275  blue >>= (16 - fbi->var.blue.length);
276 
277  value = (red << fbi->var.red.offset) |
278  (green << fbi->var.green.offset)|
279  (blue << fbi->var.blue.offset);
280  value &= 0xFFFF;
281 
282  } else if (panel_is_active(fbdev->panel)) {
283  /* COLOR TFT PALLETTIZED (use RGB 565) */
284  value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);
285  value &= 0xFFFF;
286 
287  } else if (panel_is_color(fbdev->panel)) {
288  /* COLOR STN MODE */
289  value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |
290  ((green >> 8) & 0x00F0) |
291  (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);
292  value &= 0xFFF;
293  } else {
294  /* MONOCHROME MODE */
295  value = (green >> 12) & 0x000F;
296  value &= 0xF;
297  }
298 
299  palette[regno] = value;
300 
301  return 0;
302 }
303 
304 /* fb_pan_display
305  * Pan display in x and/or y as specified
306  */
307 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
308 {
309  struct au1100fb_device *fbdev;
310  int dy;
311 
312  fbdev = to_au1100fb_device(fbi);
313 
314  print_dbg("fb_pan_display %p %p", var, fbi);
315 
316  if (!var || !fbdev) {
317  return -EINVAL;
318  }
319 
320  if (var->xoffset - fbi->var.xoffset) {
321  /* No support for X panning for now! */
322  return -EINVAL;
323  }
324 
325  print_dbg("fb_pan_display 2 %p %p", var, fbi);
326  dy = var->yoffset - fbi->var.yoffset;
327  if (dy) {
328 
329  u32 dmaaddr;
330 
331  print_dbg("Panning screen of %d lines", dy);
332 
333  dmaaddr = fbdev->regs->lcd_dmaaddr0;
334  dmaaddr += (fbi->fix.line_length * dy);
335 
336  /* TODO: Wait for current frame to finished */
337  fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
338 
339  if (panel_is_dual(fbdev->panel)) {
340  dmaaddr = fbdev->regs->lcd_dmaaddr1;
341  dmaaddr += (fbi->fix.line_length * dy);
342  fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
343  }
344  }
345  print_dbg("fb_pan_display 3 %p %p", var, fbi);
346 
347  return 0;
348 }
349 
350 /* fb_rotate
351  * Rotate the display of this angle. This doesn't seems to be used by the core,
352  * but as our hardware supports it, so why not implementing it...
353  */
354 void au1100fb_fb_rotate(struct fb_info *fbi, int angle)
355 {
356  struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
357 
358  print_dbg("fb_rotate %p %d", fbi, angle);
359 
360  if (fbdev && (angle > 0) && !(angle % 90)) {
361 
362  fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
363 
364  fbdev->regs->lcd_control &= ~(LCD_CONTROL_SM_MASK);
365  fbdev->regs->lcd_control |= ((angle/90) << LCD_CONTROL_SM_BIT);
366 
367  fbdev->regs->lcd_control |= LCD_CONTROL_GO;
368  }
369 }
370 
371 /* fb_mmap
372  * Map video memory in user space. We don't use the generic fb_mmap method mainly
373  * to allow the use of the TLB streaming flag (CCA=6)
374  */
375 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
376 {
377  struct au1100fb_device *fbdev;
378  unsigned int len;
379  unsigned long start=0, off;
380 
381  fbdev = to_au1100fb_device(fbi);
382 
383  if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) {
384  return -EINVAL;
385  }
386 
387  start = fbdev->fb_phys & PAGE_MASK;
388  len = PAGE_ALIGN((start & ~PAGE_MASK) + fbdev->fb_len);
389 
390  off = vma->vm_pgoff << PAGE_SHIFT;
391 
392  if ((vma->vm_end - vma->vm_start + off) > len) {
393  return -EINVAL;
394  }
395 
396  off += start;
397  vma->vm_pgoff = off >> PAGE_SHIFT;
398 
399  vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
400  pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
401 
402  vma->vm_flags |= VM_IO;
403 
404  if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
405  vma->vm_end - vma->vm_start,
406  vma->vm_page_prot)) {
407  return -EAGAIN;
408  }
409 
410  return 0;
411 }
412 
413 static struct fb_ops au1100fb_ops =
414 {
415  .owner = THIS_MODULE,
416  .fb_setcolreg = au1100fb_fb_setcolreg,
417  .fb_blank = au1100fb_fb_blank,
418  .fb_pan_display = au1100fb_fb_pan_display,
419  .fb_fillrect = cfb_fillrect,
420  .fb_copyarea = cfb_copyarea,
421  .fb_imageblit = cfb_imageblit,
422  .fb_rotate = au1100fb_fb_rotate,
423  .fb_mmap = au1100fb_fb_mmap,
424 };
425 
426 
427 /*-------------------------------------------------------------------------*/
428 
429 static int au1100fb_setup(struct au1100fb_device *fbdev)
430 {
431  char *this_opt, *options;
432  int num_panels = ARRAY_SIZE(known_lcd_panels);
433 
434  if (num_panels <= 0) {
435  print_err("No LCD panels supported by driver!");
436  return -ENODEV;
437  }
438 
439  if (fb_get_options(DRIVER_NAME, &options))
440  return -ENODEV;
441  if (!options)
442  return -ENODEV;
443 
444  while ((this_opt = strsep(&options, ",")) != NULL) {
445  /* Panel option */
446  if (!strncmp(this_opt, "panel:", 6)) {
447  int i;
448  this_opt += 6;
449  for (i = 0; i < num_panels; i++) {
450  if (!strncmp(this_opt, known_lcd_panels[i].name,
451  strlen(this_opt))) {
452  fbdev->panel = &known_lcd_panels[i];
453  fbdev->panel_idx = i;
454  break;
455  }
456  }
457  if (i >= num_panels) {
458  print_warn("Panel '%s' not supported!", this_opt);
459  return -ENODEV;
460  }
461  }
462  /* Unsupported option */
463  else
464  print_warn("Unsupported option \"%s\"", this_opt);
465  }
466 
467  print_info("Panel=%s", fbdev->panel->name);
468 
469  return 0;
470 }
471 
472 static int __devinit au1100fb_drv_probe(struct platform_device *dev)
473 {
474  struct au1100fb_device *fbdev = NULL;
475  struct resource *regs_res;
476  unsigned long page;
477  u32 sys_clksrc;
478 
479  /* Allocate new device private */
480  fbdev = devm_kzalloc(&dev->dev, sizeof(struct au1100fb_device),
481  GFP_KERNEL);
482  if (!fbdev) {
483  print_err("fail to allocate device private record");
484  return -ENOMEM;
485  }
486 
487  if (au1100fb_setup(fbdev))
488  goto failed;
489 
490  platform_set_drvdata(dev, (void *)fbdev);
491 
492  /* Allocate region for our registers and map them */
493  regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
494  if (!regs_res) {
495  print_err("fail to retrieve registers resource");
496  return -EFAULT;
497  }
498 
499  au1100fb_fix.mmio_start = regs_res->start;
500  au1100fb_fix.mmio_len = resource_size(regs_res);
501 
502  if (!devm_request_mem_region(&dev->dev,
503  au1100fb_fix.mmio_start,
504  au1100fb_fix.mmio_len,
505  DRIVER_NAME)) {
506  print_err("fail to lock memory region at 0x%08lx",
507  au1100fb_fix.mmio_start);
508  return -EBUSY;
509  }
510 
511  fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);
512 
513  print_dbg("Register memory map at %p", fbdev->regs);
514  print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
515 
516  /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
517  fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
518  (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
519 
520  fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,
521  PAGE_ALIGN(fbdev->fb_len),
522  &fbdev->fb_phys, GFP_KERNEL);
523  if (!fbdev->fb_mem) {
524  print_err("fail to allocate frambuffer (size: %dK))",
525  fbdev->fb_len / 1024);
526  return -ENOMEM;
527  }
528 
529  au1100fb_fix.smem_start = fbdev->fb_phys;
530  au1100fb_fix.smem_len = fbdev->fb_len;
531 
532  /*
533  * Set page reserved so that mmap will work. This is necessary
534  * since we'll be remapping normal memory.
535  */
536  for (page = (unsigned long)fbdev->fb_mem;
537  page < PAGE_ALIGN((unsigned long)fbdev->fb_mem + fbdev->fb_len);
538  page += PAGE_SIZE) {
539 #ifdef CONFIG_DMA_NONCOHERENT
540  SetPageReserved(virt_to_page(CAC_ADDR((void *)page)));
541 #else
542  SetPageReserved(virt_to_page(page));
543 #endif
544  }
545 
546  print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
547  print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
548 
549  /* Setup LCD clock to AUX (48 MHz) */
550  sys_clksrc = au_readl(SYS_CLKSRC) & ~(SYS_CS_ML_MASK | SYS_CS_DL | SYS_CS_CL);
551  au_writel((sys_clksrc | (1 << SYS_CS_ML_BIT)), SYS_CLKSRC);
552 
553  /* load the panel info into the var struct */
554  au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
555  au1100fb_var.xres = fbdev->panel->xres;
556  au1100fb_var.xres_virtual = au1100fb_var.xres;
557  au1100fb_var.yres = fbdev->panel->yres;
558  au1100fb_var.yres_virtual = au1100fb_var.yres;
559 
560  fbdev->info.screen_base = fbdev->fb_mem;
561  fbdev->info.fbops = &au1100fb_ops;
562  fbdev->info.fix = au1100fb_fix;
563 
564  fbdev->info.pseudo_palette =
565  devm_kzalloc(&dev->dev, sizeof(u32) * 16, GFP_KERNEL);
566  if (!fbdev->info.pseudo_palette)
567  return -ENOMEM;
568 
569  if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
570  print_err("Fail to allocate colormap (%d entries)",
571  AU1100_LCD_NBR_PALETTE_ENTRIES);
572  return -EFAULT;
573  }
574 
575  fbdev->info.var = au1100fb_var;
576 
577  /* Set h/w registers */
578  au1100fb_setmode(fbdev);
579 
580  /* Register new framebuffer */
581  if (register_framebuffer(&fbdev->info) < 0) {
582  print_err("cannot register new framebuffer");
583  goto failed;
584  }
585 
586  return 0;
587 
588 failed:
589  if (fbdev->fb_mem) {
590  dma_free_noncoherent(&dev->dev, fbdev->fb_len, fbdev->fb_mem,
591  fbdev->fb_phys);
592  }
593  if (fbdev->info.cmap.len != 0) {
594  fb_dealloc_cmap(&fbdev->info.cmap);
595  }
596  platform_set_drvdata(dev, NULL);
597 
598  return -ENODEV;
599 }
600 
601 int au1100fb_drv_remove(struct platform_device *dev)
602 {
603  struct au1100fb_device *fbdev = NULL;
604 
605  if (!dev)
606  return -ENODEV;
607 
608  fbdev = (struct au1100fb_device *) platform_get_drvdata(dev);
609 
610 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
611  au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
612 #endif
613  fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
614 
615  /* Clean up all probe data */
616  unregister_framebuffer(&fbdev->info);
617 
618  fb_dealloc_cmap(&fbdev->info.cmap);
619 
620  return 0;
621 }
622 
623 #ifdef CONFIG_PM
624 static u32 sys_clksrc;
625 static struct au1100fb_regs fbregs;
626 
627 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
628 {
629  struct au1100fb_device *fbdev = platform_get_drvdata(dev);
630 
631  if (!fbdev)
632  return 0;
633 
634  /* Save the clock source state */
635  sys_clksrc = au_readl(SYS_CLKSRC);
636 
637  /* Blank the LCD */
638  au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
639 
640  /* Stop LCD clocking */
641  au_writel(sys_clksrc & ~SYS_CS_ML_MASK, SYS_CLKSRC);
642 
643  memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
644 
645  return 0;
646 }
647 
648 int au1100fb_drv_resume(struct platform_device *dev)
649 {
650  struct au1100fb_device *fbdev = platform_get_drvdata(dev);
651 
652  if (!fbdev)
653  return 0;
654 
655  memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
656 
657  /* Restart LCD clocking */
658  au_writel(sys_clksrc, SYS_CLKSRC);
659 
660  /* Unblank the LCD */
661  au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
662 
663  return 0;
664 }
665 #else
666 #define au1100fb_drv_suspend NULL
667 #define au1100fb_drv_resume NULL
668 #endif
669 
670 static struct platform_driver au1100fb_driver = {
671  .driver = {
672  .name = "au1100-lcd",
673  .owner = THIS_MODULE,
674  },
675  .probe = au1100fb_drv_probe,
676  .remove = au1100fb_drv_remove,
677  .suspend = au1100fb_drv_suspend,
678  .resume = au1100fb_drv_resume,
679 };
680 
681 static int __init au1100fb_load(void)
682 {
683  return platform_driver_register(&au1100fb_driver);
684 }
685 
686 static void __exit au1100fb_unload(void)
687 {
688  platform_driver_unregister(&au1100fb_driver);
689 }
690 
691 module_init(au1100fb_load);
692 module_exit(au1100fb_unload);
693 
694 MODULE_DESCRIPTION(DRIVER_DESC);
695 MODULE_LICENSE("GPL");
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