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Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
[GitHub/mt8127/android_kernel_alcatel_ttab.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>
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 = {
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 = {
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 au_sync();
117 break;
118
119 case VESA_VSYNC_SUSPEND:
120 case VESA_HSYNC_SUSPEND:
121 case VESA_POWERDOWN:
122 /* Turn off panel */
123 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
124 au_sync();
125 break;
126 default:
127 break;
128
129 }
130 return 0;
131 }
132
133 /*
134 * Set hardware with var settings. This will enable the controller with a specific
135 * mode, normally validated with the fb_check_var method
136 */
137 int au1100fb_setmode(struct au1100fb_device *fbdev)
138 {
139 struct fb_info *info = &fbdev->info;
140 u32 words;
141 int index;
142
143 if (!fbdev)
144 return -EINVAL;
145
146 /* Update var-dependent FB info */
147 if (panel_is_active(fbdev->panel) || panel_is_color(fbdev->panel)) {
148 if (info->var.bits_per_pixel <= 8) {
149 /* palettized */
150 info->var.red.offset = 0;
151 info->var.red.length = info->var.bits_per_pixel;
152 info->var.red.msb_right = 0;
153
154 info->var.green.offset = 0;
155 info->var.green.length = info->var.bits_per_pixel;
156 info->var.green.msb_right = 0;
157
158 info->var.blue.offset = 0;
159 info->var.blue.length = info->var.bits_per_pixel;
160 info->var.blue.msb_right = 0;
161
162 info->var.transp.offset = 0;
163 info->var.transp.length = 0;
164 info->var.transp.msb_right = 0;
165
166 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
167 info->fix.line_length = info->var.xres_virtual /
168 (8/info->var.bits_per_pixel);
169 } else {
170 /* non-palettized */
171 index = (fbdev->panel->control_base & LCD_CONTROL_SBPPF_MASK) >> LCD_CONTROL_SBPPF_BIT;
172 info->var.red = rgb_bitfields[index][0];
173 info->var.green = rgb_bitfields[index][1];
174 info->var.blue = rgb_bitfields[index][2];
175 info->var.transp = rgb_bitfields[index][3];
176
177 info->fix.visual = FB_VISUAL_TRUECOLOR;
178 info->fix.line_length = info->var.xres_virtual << 1; /* depth=16 */
179 }
180 } else {
181 /* mono */
182 info->fix.visual = FB_VISUAL_MONO10;
183 info->fix.line_length = info->var.xres_virtual / 8;
184 }
185
186 info->screen_size = info->fix.line_length * info->var.yres_virtual;
187 info->var.rotate = ((fbdev->panel->control_base&LCD_CONTROL_SM_MASK) \
188 >> LCD_CONTROL_SM_BIT) * 90;
189
190 /* Determine BPP mode and format */
191 fbdev->regs->lcd_control = fbdev->panel->control_base;
192 fbdev->regs->lcd_horztiming = fbdev->panel->horztiming;
193 fbdev->regs->lcd_verttiming = fbdev->panel->verttiming;
194 fbdev->regs->lcd_clkcontrol = fbdev->panel->clkcontrol_base;
195 fbdev->regs->lcd_intenable = 0;
196 fbdev->regs->lcd_intstatus = 0;
197 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(fbdev->fb_phys);
198
199 if (panel_is_dual(fbdev->panel)) {
200 /* Second panel display seconf half of screen if possible,
201 * otherwise display the same as the first panel */
202 if (info->var.yres_virtual >= (info->var.yres << 1)) {
203 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys +
204 (info->fix.line_length *
205 (info->var.yres_virtual >> 1)));
206 } else {
207 fbdev->regs->lcd_dmaaddr1 = LCD_DMA_SA_N(fbdev->fb_phys);
208 }
209 }
210
211 words = info->fix.line_length / sizeof(u32);
212 if (!info->var.rotate || (info->var.rotate == 180)) {
213 words *= info->var.yres_virtual;
214 if (info->var.rotate /* 180 */) {
215 words -= (words % 8); /* should be divisable by 8 */
216 }
217 }
218 fbdev->regs->lcd_words = LCD_WRD_WRDS_N(words);
219
220 fbdev->regs->lcd_pwmdiv = 0;
221 fbdev->regs->lcd_pwmhi = 0;
222
223 /* Resume controller */
224 fbdev->regs->lcd_control |= LCD_CONTROL_GO;
225 mdelay(10);
226 au1100fb_fb_blank(VESA_NO_BLANKING, info);
227
228 return 0;
229 }
230
231 /* fb_setcolreg
232 * Set color in LCD palette.
233 */
234 int au1100fb_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *fbi)
235 {
236 struct au1100fb_device *fbdev;
237 u32 *palette;
238 u32 value;
239
240 fbdev = to_au1100fb_device(fbi);
241 palette = fbdev->regs->lcd_pallettebase;
242
243 if (regno > (AU1100_LCD_NBR_PALETTE_ENTRIES - 1))
244 return -EINVAL;
245
246 if (fbi->var.grayscale) {
247 /* Convert color to grayscale */
248 red = green = blue =
249 (19595 * red + 38470 * green + 7471 * blue) >> 16;
250 }
251
252 if (fbi->fix.visual == FB_VISUAL_TRUECOLOR) {
253 /* Place color in the pseudopalette */
254 if (regno > 16)
255 return -EINVAL;
256
257 palette = (u32*)fbi->pseudo_palette;
258
259 red >>= (16 - fbi->var.red.length);
260 green >>= (16 - fbi->var.green.length);
261 blue >>= (16 - fbi->var.blue.length);
262
263 value = (red << fbi->var.red.offset) |
264 (green << fbi->var.green.offset)|
265 (blue << fbi->var.blue.offset);
266 value &= 0xFFFF;
267
268 } else if (panel_is_active(fbdev->panel)) {
269 /* COLOR TFT PALLETTIZED (use RGB 565) */
270 value = (red & 0xF800)|((green >> 5) & 0x07E0)|((blue >> 11) & 0x001F);
271 value &= 0xFFFF;
272
273 } else if (panel_is_color(fbdev->panel)) {
274 /* COLOR STN MODE */
275 value = (((panel_swap_rgb(fbdev->panel) ? blue : red) >> 12) & 0x000F) |
276 ((green >> 8) & 0x00F0) |
277 (((panel_swap_rgb(fbdev->panel) ? red : blue) >> 4) & 0x0F00);
278 value &= 0xFFF;
279 } else {
280 /* MONOCHROME MODE */
281 value = (green >> 12) & 0x000F;
282 value &= 0xF;
283 }
284
285 palette[regno] = value;
286
287 return 0;
288 }
289
290 /* fb_pan_display
291 * Pan display in x and/or y as specified
292 */
293 int au1100fb_fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *fbi)
294 {
295 struct au1100fb_device *fbdev;
296 int dy;
297
298 fbdev = to_au1100fb_device(fbi);
299
300 print_dbg("fb_pan_display %p %p", var, fbi);
301
302 if (!var || !fbdev) {
303 return -EINVAL;
304 }
305
306 if (var->xoffset - fbi->var.xoffset) {
307 /* No support for X panning for now! */
308 return -EINVAL;
309 }
310
311 print_dbg("fb_pan_display 2 %p %p", var, fbi);
312 dy = var->yoffset - fbi->var.yoffset;
313 if (dy) {
314
315 u32 dmaaddr;
316
317 print_dbg("Panning screen of %d lines", dy);
318
319 dmaaddr = fbdev->regs->lcd_dmaaddr0;
320 dmaaddr += (fbi->fix.line_length * dy);
321
322 /* TODO: Wait for current frame to finished */
323 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
324
325 if (panel_is_dual(fbdev->panel)) {
326 dmaaddr = fbdev->regs->lcd_dmaaddr1;
327 dmaaddr += (fbi->fix.line_length * dy);
328 fbdev->regs->lcd_dmaaddr0 = LCD_DMA_SA_N(dmaaddr);
329 }
330 }
331 print_dbg("fb_pan_display 3 %p %p", var, fbi);
332
333 return 0;
334 }
335
336 /* fb_rotate
337 * Rotate the display of this angle. This doesn't seems to be used by the core,
338 * but as our hardware supports it, so why not implementing it...
339 */
340 void au1100fb_fb_rotate(struct fb_info *fbi, int angle)
341 {
342 struct au1100fb_device *fbdev = to_au1100fb_device(fbi);
343
344 print_dbg("fb_rotate %p %d", fbi, angle);
345
346 if (fbdev && (angle > 0) && !(angle % 90)) {
347
348 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
349
350 fbdev->regs->lcd_control &= ~(LCD_CONTROL_SM_MASK);
351 fbdev->regs->lcd_control |= ((angle/90) << LCD_CONTROL_SM_BIT);
352
353 fbdev->regs->lcd_control |= LCD_CONTROL_GO;
354 }
355 }
356
357 /* fb_mmap
358 * Map video memory in user space. We don't use the generic fb_mmap method mainly
359 * to allow the use of the TLB streaming flag (CCA=6)
360 */
361 int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
362 {
363 struct au1100fb_device *fbdev;
364 unsigned int len;
365 unsigned long start=0, off;
366
367 fbdev = to_au1100fb_device(fbi);
368
369 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) {
370 return -EINVAL;
371 }
372
373 start = fbdev->fb_phys & PAGE_MASK;
374 len = PAGE_ALIGN((start & ~PAGE_MASK) + fbdev->fb_len);
375
376 off = vma->vm_pgoff << PAGE_SHIFT;
377
378 if ((vma->vm_end - vma->vm_start + off) > len) {
379 return -EINVAL;
380 }
381
382 off += start;
383 vma->vm_pgoff = off >> PAGE_SHIFT;
384
385 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
386 pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
387
388 vma->vm_flags |= VM_IO;
389
390 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
391 vma->vm_end - vma->vm_start,
392 vma->vm_page_prot)) {
393 return -EAGAIN;
394 }
395
396 return 0;
397 }
398
399 static struct fb_ops au1100fb_ops =
400 {
401 .owner = THIS_MODULE,
402 .fb_setcolreg = au1100fb_fb_setcolreg,
403 .fb_blank = au1100fb_fb_blank,
404 .fb_pan_display = au1100fb_fb_pan_display,
405 .fb_fillrect = cfb_fillrect,
406 .fb_copyarea = cfb_copyarea,
407 .fb_imageblit = cfb_imageblit,
408 .fb_rotate = au1100fb_fb_rotate,
409 .fb_mmap = au1100fb_fb_mmap,
410 };
411
412
413 /*-------------------------------------------------------------------------*/
414
415 static int au1100fb_setup(struct au1100fb_device *fbdev)
416 {
417 char *this_opt, *options;
418 int num_panels = ARRAY_SIZE(known_lcd_panels);
419
420 if (num_panels <= 0) {
421 print_err("No LCD panels supported by driver!");
422 return -ENODEV;
423 }
424
425 if (fb_get_options(DRIVER_NAME, &options))
426 return -ENODEV;
427 if (!options)
428 return -ENODEV;
429
430 while ((this_opt = strsep(&options, ",")) != NULL) {
431 /* Panel option */
432 if (!strncmp(this_opt, "panel:", 6)) {
433 int i;
434 this_opt += 6;
435 for (i = 0; i < num_panels; i++) {
436 if (!strncmp(this_opt, known_lcd_panels[i].name,
437 strlen(this_opt))) {
438 fbdev->panel = &known_lcd_panels[i];
439 fbdev->panel_idx = i;
440 break;
441 }
442 }
443 if (i >= num_panels) {
444 print_warn("Panel '%s' not supported!", this_opt);
445 return -ENODEV;
446 }
447 }
448 /* Unsupported option */
449 else
450 print_warn("Unsupported option \"%s\"", this_opt);
451 }
452
453 print_info("Panel=%s", fbdev->panel->name);
454
455 return 0;
456 }
457
458 static int au1100fb_drv_probe(struct platform_device *dev)
459 {
460 struct au1100fb_device *fbdev = NULL;
461 struct resource *regs_res;
462 unsigned long page;
463 u32 sys_clksrc;
464
465 /* Allocate new device private */
466 fbdev = devm_kzalloc(&dev->dev, sizeof(struct au1100fb_device),
467 GFP_KERNEL);
468 if (!fbdev) {
469 print_err("fail to allocate device private record");
470 return -ENOMEM;
471 }
472
473 if (au1100fb_setup(fbdev))
474 goto failed;
475
476 platform_set_drvdata(dev, (void *)fbdev);
477
478 /* Allocate region for our registers and map them */
479 regs_res = platform_get_resource(dev, IORESOURCE_MEM, 0);
480 if (!regs_res) {
481 print_err("fail to retrieve registers resource");
482 return -EFAULT;
483 }
484
485 au1100fb_fix.mmio_start = regs_res->start;
486 au1100fb_fix.mmio_len = resource_size(regs_res);
487
488 if (!devm_request_mem_region(&dev->dev,
489 au1100fb_fix.mmio_start,
490 au1100fb_fix.mmio_len,
491 DRIVER_NAME)) {
492 print_err("fail to lock memory region at 0x%08lx",
493 au1100fb_fix.mmio_start);
494 return -EBUSY;
495 }
496
497 fbdev->regs = (struct au1100fb_regs*)KSEG1ADDR(au1100fb_fix.mmio_start);
498
499 print_dbg("Register memory map at %p", fbdev->regs);
500 print_dbg("phys=0x%08x, size=%d", fbdev->regs_phys, fbdev->regs_len);
501
502 /* Allocate the framebuffer to the maximum screen size * nbr of video buffers */
503 fbdev->fb_len = fbdev->panel->xres * fbdev->panel->yres *
504 (fbdev->panel->bpp >> 3) * AU1100FB_NBR_VIDEO_BUFFERS;
505
506 fbdev->fb_mem = dmam_alloc_coherent(&dev->dev,
507 PAGE_ALIGN(fbdev->fb_len),
508 &fbdev->fb_phys, GFP_KERNEL);
509 if (!fbdev->fb_mem) {
510 print_err("fail to allocate frambuffer (size: %dK))",
511 fbdev->fb_len / 1024);
512 return -ENOMEM;
513 }
514
515 au1100fb_fix.smem_start = fbdev->fb_phys;
516 au1100fb_fix.smem_len = fbdev->fb_len;
517
518 /*
519 * Set page reserved so that mmap will work. This is necessary
520 * since we'll be remapping normal memory.
521 */
522 for (page = (unsigned long)fbdev->fb_mem;
523 page < PAGE_ALIGN((unsigned long)fbdev->fb_mem + fbdev->fb_len);
524 page += PAGE_SIZE) {
525 #ifdef CONFIG_DMA_NONCOHERENT
526 SetPageReserved(virt_to_page(CAC_ADDR((void *)page)));
527 #else
528 SetPageReserved(virt_to_page(page));
529 #endif
530 }
531
532 print_dbg("Framebuffer memory map at %p", fbdev->fb_mem);
533 print_dbg("phys=0x%08x, size=%dK", fbdev->fb_phys, fbdev->fb_len / 1024);
534
535 /* Setup LCD clock to AUX (48 MHz) */
536 sys_clksrc = au_readl(SYS_CLKSRC) & ~(SYS_CS_ML_MASK | SYS_CS_DL | SYS_CS_CL);
537 au_writel((sys_clksrc | (1 << SYS_CS_ML_BIT)), SYS_CLKSRC);
538
539 /* load the panel info into the var struct */
540 au1100fb_var.bits_per_pixel = fbdev->panel->bpp;
541 au1100fb_var.xres = fbdev->panel->xres;
542 au1100fb_var.xres_virtual = au1100fb_var.xres;
543 au1100fb_var.yres = fbdev->panel->yres;
544 au1100fb_var.yres_virtual = au1100fb_var.yres;
545
546 fbdev->info.screen_base = fbdev->fb_mem;
547 fbdev->info.fbops = &au1100fb_ops;
548 fbdev->info.fix = au1100fb_fix;
549
550 fbdev->info.pseudo_palette =
551 devm_kzalloc(&dev->dev, sizeof(u32) * 16, GFP_KERNEL);
552 if (!fbdev->info.pseudo_palette)
553 return -ENOMEM;
554
555 if (fb_alloc_cmap(&fbdev->info.cmap, AU1100_LCD_NBR_PALETTE_ENTRIES, 0) < 0) {
556 print_err("Fail to allocate colormap (%d entries)",
557 AU1100_LCD_NBR_PALETTE_ENTRIES);
558 return -EFAULT;
559 }
560
561 fbdev->info.var = au1100fb_var;
562
563 /* Set h/w registers */
564 au1100fb_setmode(fbdev);
565
566 /* Register new framebuffer */
567 if (register_framebuffer(&fbdev->info) < 0) {
568 print_err("cannot register new framebuffer");
569 goto failed;
570 }
571
572 return 0;
573
574 failed:
575 if (fbdev->fb_mem) {
576 dma_free_noncoherent(&dev->dev, fbdev->fb_len, fbdev->fb_mem,
577 fbdev->fb_phys);
578 }
579 if (fbdev->info.cmap.len != 0) {
580 fb_dealloc_cmap(&fbdev->info.cmap);
581 }
582 platform_set_drvdata(dev, NULL);
583
584 return -ENODEV;
585 }
586
587 int au1100fb_drv_remove(struct platform_device *dev)
588 {
589 struct au1100fb_device *fbdev = NULL;
590
591 if (!dev)
592 return -ENODEV;
593
594 fbdev = (struct au1100fb_device *) platform_get_drvdata(dev);
595
596 #if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
597 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
598 #endif
599 fbdev->regs->lcd_control &= ~LCD_CONTROL_GO;
600
601 /* Clean up all probe data */
602 unregister_framebuffer(&fbdev->info);
603
604 fb_dealloc_cmap(&fbdev->info.cmap);
605
606 return 0;
607 }
608
609 #ifdef CONFIG_PM
610 static u32 sys_clksrc;
611 static struct au1100fb_regs fbregs;
612
613 int au1100fb_drv_suspend(struct platform_device *dev, pm_message_t state)
614 {
615 struct au1100fb_device *fbdev = platform_get_drvdata(dev);
616
617 if (!fbdev)
618 return 0;
619
620 /* Save the clock source state */
621 sys_clksrc = au_readl(SYS_CLKSRC);
622
623 /* Blank the LCD */
624 au1100fb_fb_blank(VESA_POWERDOWN, &fbdev->info);
625
626 /* Stop LCD clocking */
627 au_writel(sys_clksrc & ~SYS_CS_ML_MASK, SYS_CLKSRC);
628
629 memcpy(&fbregs, fbdev->regs, sizeof(struct au1100fb_regs));
630
631 return 0;
632 }
633
634 int au1100fb_drv_resume(struct platform_device *dev)
635 {
636 struct au1100fb_device *fbdev = platform_get_drvdata(dev);
637
638 if (!fbdev)
639 return 0;
640
641 memcpy(fbdev->regs, &fbregs, sizeof(struct au1100fb_regs));
642
643 /* Restart LCD clocking */
644 au_writel(sys_clksrc, SYS_CLKSRC);
645
646 /* Unblank the LCD */
647 au1100fb_fb_blank(VESA_NO_BLANKING, &fbdev->info);
648
649 return 0;
650 }
651 #else
652 #define au1100fb_drv_suspend NULL
653 #define au1100fb_drv_resume NULL
654 #endif
655
656 static struct platform_driver au1100fb_driver = {
657 .driver = {
658 .name = "au1100-lcd",
659 .owner = THIS_MODULE,
660 },
661 .probe = au1100fb_drv_probe,
662 .remove = au1100fb_drv_remove,
663 .suspend = au1100fb_drv_suspend,
664 .resume = au1100fb_drv_resume,
665 };
666
667 static int __init au1100fb_load(void)
668 {
669 return platform_driver_register(&au1100fb_driver);
670 }
671
672 static void __exit au1100fb_unload(void)
673 {
674 platform_driver_unregister(&au1100fb_driver);
675 }
676
677 module_init(au1100fb_load);
678 module_exit(au1100fb_unload);
679
680 MODULE_DESCRIPTION(DRIVER_DESC);
681 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)