xref: /openbmc/linux/drivers/video/fbdev/au1100fb.c (revision bf76544d)
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/clk.h>
45 #include <linux/module.h>
46 #include <linux/kernel.h>
47 #include <linux/errno.h>
48 #include <linux/string.h>
49 #include <linux/mm.h>
50 #include <linux/fb.h>
51 #include <linux/init.h>
52 #include <linux/interrupt.h>
53 #include <linux/ctype.h>
54 #include <linux/dma-mapping.h>
55 #include <linux/platform_device.h>
56 #include <linux/slab.h>
57 
58 #include <asm/mach-au1x00/au1000.h>
59 
60 #define DEBUG 0
61 
62 #include "au1100fb.h"
63 
64 #define DRIVER_NAME "au1100fb"
65 #define DRIVER_DESC "LCD controller driver for AU1100 processors"
66 
67 #define to_au1100fb_device(_info) \
68 	  (_info ? container_of(_info, struct au1100fb_device, info) : NULL);
69 
70 /* Bitfields format supported by the controller. Note that the order of formats
71  * SHOULD be the same as in the LCD_CONTROL_SBPPF field, so we can retrieve the
72  * right pixel format by doing rgb_bitfields[LCD_CONTROL_SBPPF_XXX >> LCD_CONTROL_SBPPF]
73  */
74 struct fb_bitfield rgb_bitfields[][4] =
75 {
76   	/*     Red, 	   Green, 	 Blue, 	     Transp   */
77 	{ { 10, 6, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
78 	{ { 11, 5, 0 }, { 5, 6, 0 }, { 0, 5, 0 }, { 0, 0, 0 } },
79 	{ { 11, 5, 0 }, { 6, 5, 0 }, { 0, 6, 0 }, { 0, 0, 0 } },
80 	{ { 10, 5, 0 }, { 5, 5, 0 }, { 0, 5, 0 }, { 15, 1, 0 } },
81 	{ { 11, 5, 0 }, { 6, 5, 0 }, { 1, 5, 0 }, { 0, 1, 0 } },
82 
83 	/* The last is used to describe 12bpp format */
84 	{ { 8, 4, 0 },  { 4, 4, 0 }, { 0, 4, 0 }, { 0, 0, 0 } },
85 };
86 
87 static struct fb_fix_screeninfo au1100fb_fix = {
88 	.id		= "AU1100 FB",
89 	.xpanstep 	= 1,
90 	.ypanstep 	= 1,
91 	.type		= FB_TYPE_PACKED_PIXELS,
92 	.accel		= FB_ACCEL_NONE,
93 };
94 
95 static struct fb_var_screeninfo au1100fb_var = {
96 	.activate	= FB_ACTIVATE_NOW,
97 	.height		= -1,
98 	.width		= -1,
99 	.vmode		= FB_VMODE_NONINTERLACED,
100 };
101 
102 /* fb_blank
103  * Blank the screen. Depending on the mode, the screen will be
104  * activated with the backlight color, or desactivated
105  */
au1100fb_fb_blank(int blank_mode,struct fb_info * fbi)106 static int au1100fb_fb_blank(int blank_mode, struct fb_info *fbi)
107 {
108 	struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
109 
110 	print_dbg("fb_blank %d %p", blank_mode, fbi);
111 
112 	switch (blank_mode) {
113 
114 	case VESA_NO_BLANKING:
115 		/* Turn on panel */
116 		fbdev->regs->lcd_control |= LCD_CONTROL_GO;
117 		wmb(); /* drain writebuffer */
118 		break;
119 
120 	case VESA_VSYNC_SUSPEND:
121 	case VESA_HSYNC_SUSPEND:
122 	case VESA_POWERDOWN:
123 		/* Turn off panel */
124 		fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
125 		wmb(); /* drain writebuffer */
126 		break;
127 	default:
128 		break;
129 
130 	}
131 	return 0;
132 }
133 
134 /*
135  * Set hardware with var settings. This will enable the controller with a specific
136  * mode, normally validated with the fb_check_var method
137 	 */
au1100fb_setmode(struct au1100fb_device * fbdev)138 int au1100fb_setmode(struct au1100fb_device *fbdev)
139 {
140 	struct fb_info *info = &fbdev->info;
141 	u32 words;
142 	int index;
143 
144 	if (!fbdev)
145 		return -EINVAL;
146 
147 	/* Update var-dependent FB info */
148 	if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {
149 		if (info->var.bits_per_pixel <= 8) {
150 			/* palettized */
151 			info->var.red.offset    = 0;
152 			info->var.red.length    = info->var.bits_per_pixel;
153 			info->var.red.msb_right = 0;
154 
155 			info->var.green.offset  = 0;
156 			info->var.green.length  = info->var.bits_per_pixel;
157 			info->var.green.msb_right = 0;
158 
159 			info->var.blue.offset   = 0;
160 			info->var.blue.length   = info->var.bits_per_pixel;
161 			info->var.blue.msb_right = 0;
162 
163 			info->var.transp.offset = 0;
164 			info->var.transp.length = 0;
165 			info->var.transp.msb_right = 0;
166 
167 			info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
168 			info->fix.line_length = info->var.xres_virtual /
169 							(8/info->var.bits_per_pixel);
170 		} else {
171 			/* non-palettized */
172 			index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;
173 			info->var.red = rgb_bitfields[index][0];
174 			info->var.green = rgb_bitfields[index][1];
175 			info->var.blue = rgb_bitfields[index][2];
176 			info->var.transp = rgb_bitfields[index][3];
177 
178 			info->fix.visual = FB_VISUAL_TRUECOLOR;
179 			info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */
180 		}
181 	} else {
182 		/* mono */
183 		info->fix.visual = FB_VISUAL_MONO10;
184 		info->fix.line_length = info->var.xres_virtual / 8;
185 	}
186 
187 	info->screen_size = info->fix.line_length * info->var.yres_virtual;
188 	info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \
189 				>> LCD_CONTROL_SM_BIT) * 90;
190 
191 	/* Determine BPP mode and format */
192 	fbdev->regs->lcd_control = fbdev->panel->control_base;
193 	fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;
194 	fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;
195 	fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;
196 	fbdev->regs->lcd_intenable = 0;
197 	fbdev->regs->lcd_intstatus = 0;
198 	fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);
199 
200 	if (panel_is_dual(fbdev->panel)) {
201 		/* Second panel display seconf half of screen if possible,
202 		 * otherwise display the same as the first panel */
203 		if (info->var.yres_virtual >= (info->var.yres << 1)) {
204 			fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +
205 							  (info->fix.line_length *
206 						          (info->var.yres_virtual >> 1)));
207 		} else {
208 			fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);
209 		}
210 	}
211 
212 	words = info->fix.line_length / sizeof(u32);
213 	if (!info->var.rotate || (info->var.rotate == 180)) {
214 		words *= info->var.yres_virtual;
215 		if (info->var.rotate /* 180 */) {
216 			words -= (words % 8); /* should be divisable by 8 */
217 		}
218 	}
219 	fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);
220 
221 	fbdev->regs->lcd_pwmdiv = 0;
222 	fbdev->regs->lcd_pwmhi = 0;
223 
224 	/* Resume controller */
225 	fbdev->regs->lcd_control |= LCD_CONTROL_GO;
226 	mdelay(10);
227 	au1100fb_fb_blank(VESA_NO_BLANKING, info);
228 
229 	return 0;
230 }
231 
232 /* fb_setcolreg
233  * Set color in LCD palette.
234  */
au1100fb_fb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * fbi)235 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
236 {
237 	struct au1100fb_device *fbdev;
238 	u32 *palette;
239 	u32 value;
240 
241 	fbdev = to_au1100fb_device(fbi);
242 	palette = fbdev->regs->lcd_palettebase;
243 
244 	if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))
245 		return -EINVAL;
246 
247 	if (fbi->var.grayscale) {
248 		/* Convert color to grayscale */
249 		red = green = blue =
250 			(19595 * red + 38470 * green + 7471 * blue) >> 16;
251 	}
252 
253 	if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {
254 		/* Place color in the pseudopalette */
255 		if (regno > 16)
256 			return -EINVAL;
257 
258 		palette = (u32*)fbi->pseudo_palette;
259 
260 		red   >>= (16 - fbi->var.red.length);
261 		green >>= (16 - fbi->var.green.length);
262 		blue  >>= (16 - fbi->var.blue.length);
263 
264 		value = (red   << fbi->var.red.offset) 	|
265 			(green << fbi->var.green.offset)|
266 			(blue  << fbi->var.blue.offset);
267 		value &= 0xFFFF;
268 
269 	} else if (panel_is_active(fbdev->panel)) {
270 		/* COLOR TFT PALLETTIZED (use RGB 565) */
271 		value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);
272 		value &= 0xFFFF;
273 
274 	} else if (panel_is_color(fbdev->panel)) {
275 		/* COLOR STN MODE */
276 		value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |
277 			((green >> 8) & 0x00F0) |
278 			(((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);
279 		value &= 0xFFF;
280 	} else {
281 		/* MONOCHROME MODE */
282 		value = (green >> 12) & 0x000F;
283 		value &= 0xF;
284 	}
285 
286 	palette[regno] = value;
287 
288 	return 0;
289 }
290 
291 /* fb_pan_display
292  * Pan display in x and/or y as specified
293  */
au1100fb_fb_pan_display(struct fb_var_screeninfo * var,struct fb_info * fbi)294 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
295 {
296 	struct au1100fb_device *fbdev;
297 	int dy;
298 
299 	fbdev = to_au1100fb_device(fbi);
300 
301 	print_dbg("fb_pan_display %p %p", var, fbi);
302 
303 	if (!var || !fbdev) {
304 		return -EINVAL;
305 	}
306 
307 	if (var->xoffset - fbi->var.xoffset) {
308 		/* No support for X panning for now! */
309 		return -EINVAL;
310 	}
311 
312 	print_dbg("fb_pan_display 2 %p %p", var, fbi);
313 	dy = var->yoffset - fbi->var.yoffset;
314 	if (dy) {
315 
316 		u32 dmaaddr;
317 
318 		print_dbg("Panning screen of %d lines", dy);
319 
320 		dmaaddr = fbdev->regs->lcd_dmaaddr0;
321 		dmaaddr += (fbi->fix.line_length * dy);
322 
323 		/* TODO: Wait for current frame to finished */
324 		fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
325 
326 		if (panel_is_dual(fbdev->panel)) {
327 			dmaaddr = fbdev->regs->lcd_dmaaddr1;
328 			dmaaddr += (fbi->fix.line_length * dy);
329 			fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
330 	}
331 	}
332 	print_dbg("fb_pan_display 3 %p %p", var, fbi);
333 
334 	return 0;
335 }
336 
337 /* fb_mmap
338  * Map video memory in user space. We don't use the generic fb_mmap method mainly
339  * to allow the use of the TLB streaming flag (CCA=6)
340  */
au1100fb_fb_mmap(struct fb_info * fbi,struct vm_area_struct * vma)341 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
342 {
343 	struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
344 
345 	pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
346 
347 	return dma_mmap_coherent(fbdev->dev, vma, fbdev->fb_mem, fbdev->fb_phys,
348 			fbdev->fb_len);
349 }
350 
351 static const struct fb_ops au1100fb_ops =
352 {
353 	.owner			= THIS_MODULE,
354 	.fb_setcolreg		= au1100fb_fb_setcolreg,
355 	.fb_blank		= au1100fb_fb_blank,
356 	.fb_pan_display		= au1100fb_fb_pan_display,
357 	.fb_fillrect		= cfb_fillrect,
358 	.fb_copyarea		= cfb_copyarea,
359 	.fb_imageblit		= cfb_imageblit,
360 	.fb_mmap		= au1100fb_fb_mmap,
361 };
362 
363 
364 /*-------------------------------------------------------------------------*/
365 
au1100fb_setup(struct au1100fb_device * fbdev)366 static int au1100fb_setup(struct au1100fb_device *fbdev)
367 {
368 	char *this_opt, *options;
369 	int num_panels = ARRAY_SIZE(known_lcd_panels);
370 
371 	if (num_panels <= 0) {
372 		print_err("No LCD panels supported by driver!");
373 		return -ENODEV;
374 	}
375 
376 	if (fb_get_options(DRIVER_NAME, &options))
377 		return -ENODEV;
378 	if (!options)
379 		return -ENODEV;
380 
381 	while ((this_opt = strsep(&options, ",")) != NULL) {
382 		/* Panel option */
383 		if (!strncmp(this_opt, "panel:", 6)) {
384 			int i;
385 			this_opt += 6;
386 			for (i = 0; i < num_panels; i++) {
387 				if (!strncmp(this_opt, known_lcd_panels[i].name,
388 					     strlen(this_opt))) {
389 					fbdev->panel = &known_lcd_panels[i];
390 					fbdev->panel_idx = i;
391 					break;
392 				}
393 			}
394 			if (i >= num_panels) {
395 				print_warn("Panel '%s' not supported!", this_opt);
396 				return -ENODEV;
397 			}
398 		}
399 		/* Unsupported option */
400 		else
401 			print_warn("Unsupported option \"%s\"", this_opt);
402 	}
403 
404 	print_info("Panel=%s", fbdev->panel->name);
405 
406 	return 0;
407 }
408 
au1100fb_drv_probe(struct platform_device * dev)409 static int au1100fb_drv_probe(struct platform_device *dev)
410 {
411 	struct au1100fb_device *fbdev;
412 	struct resource *regs_res;
413 	struct clk *c;
414 
415 	/* Allocate new device private */
416 	fbdev = devm_kzalloc(&dev->dev, sizeof(*fbdev), GFP_KERNEL);
417 	if (!fbdev)
418 		return -ENOMEM;
419 
420 	if (au1100fb_setup(fbdev))
421 		goto failed;
422 
423 	platform_set_drvdata(dev, (void *)fbdev);
424 	fbdev->dev = &dev->dev;
425 
426 	/* Allocate region for our registers and map them */
427 	regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
428 	if (!regs_res) {
429 		print_err("fail to retrieve registers resource");
430 		return -EFAULT;
431 	}
432 
433 	au1100fb_fix.mmio_start = regs_res->start;
434 	au1100fb_fix.mmio_len = resource_size(regs_res);
435 
436 	if (!devm_request_mem_region(&dev->dev,
437 				     au1100fb_fix.mmio_start,
438 				     au1100fb_fix.mmio_len,
439 				     DRIVER_NAME)) {
440 		print_err("fail to lock memory region at 0x%08lx",
441 				au1100fb_fix.mmio_start);
442 		return -EBUSY;
443 	}
444 
445 	fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);
446 
447 	print_dbg("Register memory map at %p", fbdev->regs);
448 	print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
449 
450 	c = clk_get(NULL, "lcd_intclk");
451 	if (!IS_ERR(c)) {
452 		fbdev->lcdclk = c;
453 		clk_set_rate(c, 48000000);
454 		clk_prepare_enable(c);
455 	}
456 
457 	/* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
458 	fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
459 		  	(fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
460 
461 	fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,
462 					    PAGE_ALIGN(fbdev->fb_len),
463 					    &fbdev->fb_phys, GFP_KERNEL);
464 	if (!fbdev->fb_mem) {
465 		print_err("fail to allocate framebuffer (size: %dK))",
466 			  fbdev->fb_len / 1024);
467 		return -ENOMEM;
468 	}
469 
470 	au1100fb_fix.smem_start = fbdev->fb_phys;
471 	au1100fb_fix.smem_len = fbdev->fb_len;
472 
473 	print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
474 	print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
475 
476 	/* load the panel info into the var struct */
477 	au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
478 	au1100fb_var.xres = fbdev->panel->xres;
479 	au1100fb_var.xres_virtual = au1100fb_var.xres;
480 	au1100fb_var.yres = fbdev->panel->yres;
481 	au1100fb_var.yres_virtual = au1100fb_var.yres;
482 
483 	fbdev->info.screen_base = fbdev->fb_mem;
484 	fbdev->info.fbops = &au1100fb_ops;
485 	fbdev->info.fix = au1100fb_fix;
486 
487 	fbdev->info.pseudo_palette =
488 		devm_kcalloc(&dev->dev, 16, sizeof(u32), GFP_KERNEL);
489 	if (!fbdev->info.pseudo_palette)
490 		return -ENOMEM;
491 
492 	if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
493 		print_err("Fail to allocate colormap (%d entries)",
494 			   AU1100_LCD_NBR_PALETTE_ENTRIES);
495 		return -EFAULT;
496 	}
497 
498 	fbdev->info.var = au1100fb_var;
499 
500 	/* Set h/w registers */
501 	au1100fb_setmode(fbdev);
502 
503 	/* Register new framebuffer */
504 	if (register_framebuffer(&fbdev->info) < 0) {
505 		print_err("cannot register new framebuffer");
506 		goto failed;
507 	}
508 
509 	return 0;
510 
511 failed:
512 	if (fbdev->lcdclk) {
513 		clk_disable_unprepare(fbdev->lcdclk);
514 		clk_put(fbdev->lcdclk);
515 	}
516 	if (fbdev->info.cmap.len != 0) {
517 		fb_dealloc_cmap(&fbdev->info.cmap);
518 	}
519 
520 	return -ENODEV;
521 }
522 
au1100fb_drv_remove(struct platform_device * dev)523 void au1100fb_drv_remove(struct platform_device *dev)
524 {
525 	struct au1100fb_device *fbdev = NULL;
526 
527 	fbdev = platform_get_drvdata(dev);
528 
529 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
530 	au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
531 #endif
532 	fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
533 
534 	/* Clean up all probe data */
535 	unregister_framebuffer(&fbdev->info);
536 
537 	fb_dealloc_cmap(&fbdev->info.cmap);
538 
539 	if (fbdev->lcdclk) {
540 		clk_disable_unprepare(fbdev->lcdclk);
541 		clk_put(fbdev->lcdclk);
542 	}
543 }
544 
545 #ifdef CONFIG_PM
546 static struct au1100fb_regs fbregs;
547 
au1100fb_drv_suspend(struct platform_device * dev,pm_message_t state)548 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
549 {
550 	struct au1100fb_device *fbdev = platform_get_drvdata(dev);
551 
552 	if (!fbdev)
553 		return 0;
554 
555 	/* Blank the LCD */
556 	au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
557 
558 	clk_disable(fbdev->lcdclk);
559 
560 	memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
561 
562 	return 0;
563 }
564 
au1100fb_drv_resume(struct platform_device * dev)565 int au1100fb_drv_resume(struct platform_device *dev)
566 {
567 	struct au1100fb_device *fbdev = platform_get_drvdata(dev);
568 
569 	if (!fbdev)
570 		return 0;
571 
572 	memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
573 
574 	clk_enable(fbdev->lcdclk);
575 
576 	/* Unblank the LCD */
577 	au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
578 
579 	return 0;
580 }
581 #else
582 #define au1100fb_drv_suspend NULL
583 #define au1100fb_drv_resume NULL
584 #endif
585 
586 static struct platform_driver au1100fb_driver = {
587 	.driver = {
588 		.name		= "au1100-lcd",
589 	},
590 	.probe		= au1100fb_drv_probe,
591 	.remove_new	= au1100fb_drv_remove,
592 	.suspend	= au1100fb_drv_suspend,
593 	.resume		= au1100fb_drv_resume,
594 };
595 module_platform_driver(au1100fb_driver);
596 
597 MODULE_DESCRIPTION(DRIVER_DESC);
598 MODULE_LICENSE("GPL");
599