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bf54x-lq043fb.c
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1 /*
2  * File: drivers/video/bf54x-lq043.c
3  * Based on:
4  * Author: Michael Hennerich <[email protected]>
5  *
6  * Created:
7  * Description: ADSP-BF54x Framebuffer driver
8  *
9  *
10  * Modified:
11  * Copyright 2007-2008 Analog Devices Inc.
12  *
13  * Bugs: Enter bugs at http://blackfin.uclinux.org/
14  *
15  * This program is free software; you can redistribute it and/or modify
16  * it under the terms of the GNU General Public License as published by
17  * the Free Software Foundation; either version 2 of the License, or
18  * (at your option) any later version.
19  *
20  * This program is distributed in the hope that it will be useful,
21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23  * GNU General Public License for more details.
24  *
25  * You should have received a copy of the GNU General Public License
26  * along with this program; if not, see the file COPYING, or write
27  * to the Free Software Foundation, Inc.,
28  * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
29  */
30 
31 #include <linux/module.h>
32 #include <linux/kernel.h>
33 #include <linux/errno.h>
34 #include <linux/string.h>
35 #include <linux/mm.h>
36 #include <linux/tty.h>
37 #include <linux/slab.h>
38 #include <linux/delay.h>
39 #include <linux/fb.h>
40 #include <linux/ioport.h>
41 #include <linux/init.h>
42 #include <linux/types.h>
43 #include <linux/interrupt.h>
44 #include <linux/sched.h>
45 #include <linux/timer.h>
46 #include <linux/device.h>
47 #include <linux/backlight.h>
48 #include <linux/lcd.h>
49 #include <linux/spinlock.h>
50 #include <linux/dma-mapping.h>
51 #include <linux/platform_device.h>
52 
53 #include <asm/blackfin.h>
54 #include <asm/irq.h>
55 #include <asm/dpmc.h>
56 #include <asm/dma-mapping.h>
57 #include <asm/dma.h>
58 #include <asm/gpio.h>
59 #include <asm/portmux.h>
60 
61 #include <mach/bf54x-lq043.h>
62 
63 #define NO_BL_SUPPORT
64 
65 #define DRIVER_NAME "bf54x-lq043"
66 static char driver_name[] = DRIVER_NAME;
67 
68 #define BFIN_LCD_NBR_PALETTE_ENTRIES 256
69 
70 #define EPPI0_18 {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2, P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3, \
71  P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7, P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, \
72  P_PPI0_D11, P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15, P_PPI0_D16, P_PPI0_D17, 0}
73 
74 #define EPPI0_24 {P_PPI0_D18, P_PPI0_D19, P_PPI0_D20, P_PPI0_D21, P_PPI0_D22, P_PPI0_D23, 0}
75 
77  struct fb_info *fb;
78  struct device *dev;
79 
81 
82  unsigned char *fb_buffer; /* RGB Buffer */
83 
86  int irq;
87  spinlock_t lock; /* lock */
88 };
89 
90 static int nocursor;
91 module_param(nocursor, int, 0644);
92 MODULE_PARM_DESC(nocursor, "cursor enable/disable");
93 
94 static int outp_rgb666;
95 module_param(outp_rgb666, int, 0);
96 MODULE_PARM_DESC(outp_rgb666, "Output 18-bit RGB666");
97 
98 #define LCD_X_RES 480 /*Horizontal Resolution */
99 #define LCD_Y_RES 272 /* Vertical Resolution */
100 
101 #define LCD_BPP 24 /* Bit Per Pixel */
102 #define DMA_BUS_SIZE 32
103 
104 /* -- Horizontal synchronizing --
105  *
106  * Timing characteristics taken from the SHARP LQ043T1DG01 datasheet
107  * (LCY-W-06602A Page 9 of 22)
108  *
109  * Clock Frequency 1/Tc Min 7.83 Typ 9.00 Max 9.26 MHz
110  *
111  * Period TH - 525 - Clock
112  * Pulse width THp - 41 - Clock
113  * Horizontal period THd - 480 - Clock
114  * Back porch THb - 2 - Clock
115  * Front porch THf - 2 - Clock
116  *
117  * -- Vertical synchronizing --
118  * Period TV - 286 - Line
119  * Pulse width TVp - 10 - Line
120  * Vertical period TVd - 272 - Line
121  * Back porch TVb - 2 - Line
122  * Front porch TVf - 2 - Line
123  */
124 
125 #define LCD_CLK (8*1000*1000) /* 8MHz */
126 
127 /* # active data to transfer after Horizontal Delay clock */
128 #define EPPI_HCOUNT LCD_X_RES
129 
130 /* # active lines to transfer after Vertical Delay clock */
131 #define EPPI_VCOUNT LCD_Y_RES
132 
133 /* Samples per Line = 480 (active data) + 45 (padding) */
134 #define EPPI_LINE 525
135 
136 /* Lines per Frame = 272 (active data) + 14 (padding) */
137 #define EPPI_FRAME 286
138 
139 /* FS1 (Hsync) Width (Typical)*/
140 #define EPPI_FS1W_HBL 41
141 
142 /* FS1 (Hsync) Period (Typical) */
143 #define EPPI_FS1P_AVPL EPPI_LINE
144 
145 /* Horizontal Delay clock after assertion of Hsync (Typical) */
146 #define EPPI_HDELAY 43
147 
148 /* FS2 (Vsync) Width = FS1 (Hsync) Period * 10 */
149 #define EPPI_FS2W_LVB (EPPI_LINE * 10)
150 
151  /* FS2 (Vsync) Period = FS1 (Hsync) Period * Lines per Frame */
152 #define EPPI_FS2P_LAVF (EPPI_LINE * EPPI_FRAME)
153 
154 /* Vertical Delay after assertion of Vsync (2 Lines) */
155 #define EPPI_VDELAY 12
156 
157 #define EPPI_CLIP 0xFF00FF00
158 
159 /* EPPI Control register configuration value for RGB out
160  * - EPPI as Output
161  * GP 2 frame sync mode,
162  * Internal Clock generation disabled, Internal FS generation enabled,
163  * Receives samples on EPPI_CLK raising edge, Transmits samples on EPPI_CLK falling edge,
164  * FS1 & FS2 are active high,
165  * DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
166  * DMA Unpacking disabled when RGB Formating is enabled, otherwise DMA unpacking enabled
167  * Swapping Enabled,
168  * One (DMA) Channel Mode,
169  * RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
170  * Regular watermark - when FIFO is 100% full,
171  * Urgent watermark - when FIFO is 75% full
172  */
173 
174 #define EPPI_CONTROL (0x20136E2E | SWAPEN)
175 
176 static inline u16 get_eppi_clkdiv(u32 target_ppi_clk)
177 {
178  u32 sclk = get_sclk();
179 
180  /* EPPI_CLK = (SCLK) / (2 * (EPPI_CLKDIV[15:0] + 1)) */
181 
182  return (((sclk / target_ppi_clk) / 2) - 1);
183 }
184 
185 static void config_ppi(struct bfin_bf54xfb_info *fbi)
186 {
187 
188  u16 eppi_clkdiv = get_eppi_clkdiv(LCD_CLK);
189 
195 
198 
203 
204  bfin_write_EPPI0_CLKDIV(eppi_clkdiv);
205 
206 /*
207  * DLEN = 6 (24 bits for RGB888 out) or 5 (18 bits for RGB666 out)
208  * RGB Formatting Enabled for RGB666 output, disabled for RGB888 output
209  */
210  if (outp_rgb666)
212  RGB_FMT_EN);
213  else
215  ~RGB_FMT_EN);
216 
217 
218 }
219 
220 static int config_dma(struct bfin_bf54xfb_info *fbi)
221 {
222 
223  set_dma_config(CH_EPPI0,
224  set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
226  DATA_SIZE_32,
228  set_dma_x_count(CH_EPPI0, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
229  set_dma_x_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
230  set_dma_y_count(CH_EPPI0, LCD_Y_RES);
231  set_dma_y_modify(CH_EPPI0, DMA_BUS_SIZE / 8);
232  set_dma_start_addr(CH_EPPI0, (unsigned long)fbi->fb_buffer);
233 
234  return 0;
235 }
236 
237 static int request_ports(struct bfin_bf54xfb_info *fbi)
238 {
239 
240  u16 eppi_req_18[] = EPPI0_18;
241  u16 disp = fbi->mach_info->disp;
242 
244  printk(KERN_ERR "Requesting GPIO %d failed\n", disp);
245  return -EFAULT;
246  }
247 
248  if (peripheral_request_list(eppi_req_18, DRIVER_NAME)) {
249  printk(KERN_ERR "Requesting Peripherals failed\n");
250  gpio_free(disp);
251  return -EFAULT;
252  }
253 
254  if (!outp_rgb666) {
255 
256  u16 eppi_req_24[] = EPPI0_24;
257 
258  if (peripheral_request_list(eppi_req_24, DRIVER_NAME)) {
259  printk(KERN_ERR "Requesting Peripherals failed\n");
260  peripheral_free_list(eppi_req_18);
261  gpio_free(disp);
262  return -EFAULT;
263  }
264  }
265 
266  return 0;
267 }
268 
269 static void free_ports(struct bfin_bf54xfb_info *fbi)
270 {
271 
272  u16 eppi_req_18[] = EPPI0_18;
273 
274  gpio_free(fbi->mach_info->disp);
275 
276  peripheral_free_list(eppi_req_18);
277 
278  if (!outp_rgb666) {
279  u16 eppi_req_24[] = EPPI0_24;
280  peripheral_free_list(eppi_req_24);
281  }
282 }
283 
284 static int bfin_bf54x_fb_open(struct fb_info *info, int user)
285 {
286  struct bfin_bf54xfb_info *fbi = info->par;
287 
288  spin_lock(&fbi->lock);
289  fbi->lq043_open_cnt++;
290 
291  if (fbi->lq043_open_cnt <= 1) {
292 
294  SSYNC();
295 
296  config_dma(fbi);
297  config_ppi(fbi);
298 
299  /* start dma */
302  }
303 
304  spin_unlock(&fbi->lock);
305 
306  return 0;
307 }
308 
309 static int bfin_bf54x_fb_release(struct fb_info *info, int user)
310 {
311  struct bfin_bf54xfb_info *fbi = info->par;
312 
313  spin_lock(&fbi->lock);
314 
315  fbi->lq043_open_cnt--;
316 
317  if (fbi->lq043_open_cnt <= 0) {
318 
320  SSYNC();
322  }
323 
324  spin_unlock(&fbi->lock);
325 
326  return 0;
327 }
328 
329 static int bfin_bf54x_fb_check_var(struct fb_var_screeninfo *var,
330  struct fb_info *info)
331 {
332 
333  switch (var->bits_per_pixel) {
334  case 24:/* TRUECOLOUR, 16m */
335  var->red.offset = 16;
336  var->green.offset = 8;
337  var->blue.offset = 0;
338  var->red.length = var->green.length = var->blue.length = 8;
339  var->transp.offset = 0;
340  var->transp.length = 0;
341  var->transp.msb_right = 0;
342  var->red.msb_right = 0;
343  var->green.msb_right = 0;
344  var->blue.msb_right = 0;
345  break;
346  default:
347  pr_debug("%s: depth not supported: %u BPP\n", __func__,
348  var->bits_per_pixel);
349  return -EINVAL;
350  }
351 
352  if (info->var.xres != var->xres || info->var.yres != var->yres ||
353  info->var.xres_virtual != var->xres_virtual ||
354  info->var.yres_virtual != var->yres_virtual) {
355  pr_debug("%s: Resolution not supported: X%u x Y%u \n",
356  __func__, var->xres, var->yres);
357  return -EINVAL;
358  }
359 
360  /*
361  * Memory limit
362  */
363 
364  if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
365  pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
366  __func__, var->yres_virtual);
367  return -ENOMEM;
368  }
369 
370  return 0;
371 }
372 
373 int bfin_bf54x_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
374 {
375  if (nocursor)
376  return 0;
377  else
378  return -EINVAL; /* just to force soft_cursor() call */
379 }
380 
381 static int bfin_bf54x_fb_setcolreg(u_int regno, u_int red, u_int green,
383  struct fb_info *info)
384 {
385  if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
386  return -EINVAL;
387 
388  if (info->var.grayscale) {
389  /* grayscale = 0.30*R + 0.59*G + 0.11*B */
390  red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
391  }
392 
393  if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
394 
395  u32 value;
396  /* Place color in the pseudopalette */
397  if (regno > 16)
398  return -EINVAL;
399 
400  red >>= (16 - info->var.red.length);
401  green >>= (16 - info->var.green.length);
402  blue >>= (16 - info->var.blue.length);
403 
404  value = (red << info->var.red.offset) |
405  (green << info->var.green.offset) |
406  (blue << info->var.blue.offset);
407  value &= 0xFFFFFF;
408 
409  ((u32 *) (info->pseudo_palette))[regno] = value;
410 
411  }
412 
413  return 0;
414 }
415 
416 static struct fb_ops bfin_bf54x_fb_ops = {
417  .owner = THIS_MODULE,
418  .fb_open = bfin_bf54x_fb_open,
419  .fb_release = bfin_bf54x_fb_release,
420  .fb_check_var = bfin_bf54x_fb_check_var,
421  .fb_fillrect = cfb_fillrect,
422  .fb_copyarea = cfb_copyarea,
423  .fb_imageblit = cfb_imageblit,
424  .fb_cursor = bfin_bf54x_fb_cursor,
425  .fb_setcolreg = bfin_bf54x_fb_setcolreg,
426 };
427 
428 #ifndef NO_BL_SUPPORT
429 static int bl_get_brightness(struct backlight_device *bd)
430 {
431  return 0;
432 }
433 
434 static const struct backlight_ops bfin_lq043fb_bl_ops = {
435  .get_brightness = bl_get_brightness,
436 };
437 
438 static struct backlight_device *bl_dev;
439 
440 static int bfin_lcd_get_power(struct lcd_device *dev)
441 {
442  return 0;
443 }
444 
445 static int bfin_lcd_set_power(struct lcd_device *dev, int power)
446 {
447  return 0;
448 }
449 
450 static int bfin_lcd_get_contrast(struct lcd_device *dev)
451 {
452  return 0;
453 }
454 
455 static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
456 {
457 
458  return 0;
459 }
460 
461 static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
462 {
463  if (!fi || (fi == &bfin_bf54x_fb))
464  return 1;
465  return 0;
466 }
467 
468 static struct lcd_ops bfin_lcd_ops = {
469  .get_power = bfin_lcd_get_power,
470  .set_power = bfin_lcd_set_power,
471  .get_contrast = bfin_lcd_get_contrast,
472  .set_contrast = bfin_lcd_set_contrast,
473  .check_fb = bfin_lcd_check_fb,
474 };
475 
476 static struct lcd_device *lcd_dev;
477 #endif
478 
479 static irqreturn_t bfin_bf54x_irq_error(int irq, void *dev_id)
480 {
481  /*struct bfin_bf54xfb_info *info = dev_id;*/
482 
484 
485  bfin_write_EPPI0_STATUS(0xFFFF);
486 
487  if (status) {
490 
491  /* start dma */
494  bfin_write_EPPI0_STATUS(0xFFFF);
495  }
496 
497  return IRQ_HANDLED;
498 }
499 
500 static int __devinit bfin_bf54x_probe(struct platform_device *pdev)
501 {
502 #ifndef NO_BL_SUPPORT
503  struct backlight_properties props;
504 #endif
505  struct bfin_bf54xfb_info *info;
506  struct fb_info *fbinfo;
507  int ret;
508 
509  printk(KERN_INFO DRIVER_NAME ": FrameBuffer initializing...\n");
510 
511  if (request_dma(CH_EPPI0, "CH_EPPI0") < 0) {
513  ": couldn't request CH_EPPI0 DMA\n");
514  ret = -EFAULT;
515  goto out1;
516  }
517 
518  fbinfo =
519  framebuffer_alloc(sizeof(struct bfin_bf54xfb_info), &pdev->dev);
520  if (!fbinfo) {
521  ret = -ENOMEM;
522  goto out2;
523  }
524 
525  info = fbinfo->par;
526  info->fb = fbinfo;
527  info->dev = &pdev->dev;
528  spin_lock_init(&info->lock);
529 
530  platform_set_drvdata(pdev, fbinfo);
531 
532  strcpy(fbinfo->fix.id, driver_name);
533 
534  info->mach_info = pdev->dev.platform_data;
535 
536  if (info->mach_info == NULL) {
537  dev_err(&pdev->dev,
538  "no platform data for lcd, cannot attach\n");
539  ret = -EINVAL;
540  goto out3;
541  }
542 
543  fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
544  fbinfo->fix.type_aux = 0;
545  fbinfo->fix.xpanstep = 0;
546  fbinfo->fix.ypanstep = 0;
547  fbinfo->fix.ywrapstep = 0;
548  fbinfo->fix.accel = FB_ACCEL_NONE;
549  fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
550 
551  fbinfo->var.nonstd = 0;
552  fbinfo->var.activate = FB_ACTIVATE_NOW;
553  fbinfo->var.height = info->mach_info->height;
554  fbinfo->var.width = info->mach_info->width;
555  fbinfo->var.accel_flags = 0;
556  fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
557 
558  fbinfo->fbops = &bfin_bf54x_fb_ops;
559  fbinfo->flags = FBINFO_FLAG_DEFAULT;
560 
561  fbinfo->var.xres = info->mach_info->xres.defval;
562  fbinfo->var.xres_virtual = info->mach_info->xres.defval;
563  fbinfo->var.yres = info->mach_info->yres.defval;
564  fbinfo->var.yres_virtual = info->mach_info->yres.defval;
565  fbinfo->var.bits_per_pixel = info->mach_info->bpp.defval;
566 
567  fbinfo->var.upper_margin = 0;
568  fbinfo->var.lower_margin = 0;
569  fbinfo->var.vsync_len = 0;
570 
571  fbinfo->var.left_margin = 0;
572  fbinfo->var.right_margin = 0;
573  fbinfo->var.hsync_len = 0;
574 
575  fbinfo->var.red.offset = 16;
576  fbinfo->var.green.offset = 8;
577  fbinfo->var.blue.offset = 0;
578  fbinfo->var.transp.offset = 0;
579  fbinfo->var.red.length = 8;
580  fbinfo->var.green.length = 8;
581  fbinfo->var.blue.length = 8;
582  fbinfo->var.transp.length = 0;
583  fbinfo->fix.smem_len = info->mach_info->xres.max *
584  info->mach_info->yres.max * info->mach_info->bpp.max / 8;
585 
586  fbinfo->fix.line_length = fbinfo->var.xres_virtual *
587  fbinfo->var.bits_per_pixel / 8;
588 
589  info->fb_buffer =
590  dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
591  GFP_KERNEL);
592 
593  if (NULL == info->fb_buffer) {
595  ": couldn't allocate dma buffer.\n");
596  ret = -ENOMEM;
597  goto out3;
598  }
599 
600  fbinfo->screen_base = (void *)info->fb_buffer;
601  fbinfo->fix.smem_start = (int)info->fb_buffer;
602 
603  fbinfo->fbops = &bfin_bf54x_fb_ops;
604 
605  fbinfo->pseudo_palette = devm_kzalloc(&pdev->dev, sizeof(u32) * 16,
606  GFP_KERNEL);
607  if (!fbinfo->pseudo_palette) {
609  "Fail to allocate pseudo_palette\n");
610 
611  ret = -ENOMEM;
612  goto out4;
613  }
614 
616  < 0) {
618  "Fail to allocate colormap (%d entries)\n",
620  ret = -EFAULT;
621  goto out4;
622  }
623 
624  if (request_ports(info)) {
625  printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
626  ret = -EFAULT;
627  goto out6;
628  }
629 
630  info->irq = platform_get_irq(pdev, 0);
631  if (info->irq < 0) {
632  ret = -EINVAL;
633  goto out7;
634  }
635 
636  if (request_irq(info->irq, bfin_bf54x_irq_error, 0,
637  "PPI ERROR", info) < 0) {
639  ": unable to request PPI ERROR IRQ\n");
640  ret = -EFAULT;
641  goto out7;
642  }
643 
644  if (register_framebuffer(fbinfo) < 0) {
646  ": unable to register framebuffer.\n");
647  ret = -EINVAL;
648  goto out8;
649  }
650 #ifndef NO_BL_SUPPORT
651  memset(&props, 0, sizeof(struct backlight_properties));
652  props.type = BACKLIGHT_RAW;
653  props.max_brightness = 255;
654  bl_dev = backlight_device_register("bf54x-bl", NULL, NULL,
655  &bfin_lq043fb_bl_ops, &props);
656  if (IS_ERR(bl_dev)) {
658  ": unable to register backlight.\n");
659  ret = -EINVAL;
660  unregister_framebuffer(fbinfo);
661  goto out8;
662  }
663 
664  lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, NULL, &bfin_lcd_ops);
665  lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
666 #endif
667 
668  return 0;
669 
670 out8:
671  free_irq(info->irq, info);
672 out7:
673  free_ports(info);
674 out6:
675  fb_dealloc_cmap(&fbinfo->cmap);
676 out4:
677  dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
678  info->dma_handle);
679 out3:
680  framebuffer_release(fbinfo);
681 out2:
683 out1:
684  platform_set_drvdata(pdev, NULL);
685 
686  return ret;
687 }
688 
689 static int __devexit bfin_bf54x_remove(struct platform_device *pdev)
690 {
691 
692  struct fb_info *fbinfo = platform_get_drvdata(pdev);
693  struct bfin_bf54xfb_info *info = fbinfo->par;
694 
696  free_irq(info->irq, info);
697 
698  if (info->fb_buffer != NULL)
699  dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
700  info->dma_handle);
701 
702  fb_dealloc_cmap(&fbinfo->cmap);
703 
704 #ifndef NO_BL_SUPPORT
705  lcd_device_unregister(lcd_dev);
707 #endif
708 
709  unregister_framebuffer(fbinfo);
710 
711  free_ports(info);
712 
713  printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");
714 
715  return 0;
716 }
717 
718 #ifdef CONFIG_PM
719 static int bfin_bf54x_suspend(struct platform_device *pdev, pm_message_t state)
720 {
721  struct fb_info *fbinfo = platform_get_drvdata(pdev);
722 
725  bfin_write_EPPI0_STATUS(0xFFFF);
726 
727  return 0;
728 }
729 
730 static int bfin_bf54x_resume(struct platform_device *pdev)
731 {
732  struct fb_info *fbinfo = platform_get_drvdata(pdev);
733  struct bfin_bf54xfb_info *info = fbinfo->par;
734 
735  if (info->lq043_open_cnt) {
736 
738  SSYNC();
739 
740  config_dma(info);
741  config_ppi(info);
742 
743  /* start dma */
746  }
747 
748  return 0;
749 }
750 #else
751 #define bfin_bf54x_suspend NULL
752 #define bfin_bf54x_resume NULL
753 #endif
754 
755 static struct platform_driver bfin_bf54x_driver = {
756  .probe = bfin_bf54x_probe,
757  .remove = __devexit_p(bfin_bf54x_remove),
758  .suspend = bfin_bf54x_suspend,
759  .resume = bfin_bf54x_resume,
760  .driver = {
761  .name = DRIVER_NAME,
762  .owner = THIS_MODULE,
763  },
764 };
765 
766 static int __init bfin_bf54x_driver_init(void)
767 {
768  return platform_driver_register(&bfin_bf54x_driver);
769 }
770 
771 static void __exit bfin_bf54x_driver_cleanup(void)
772 {
773  platform_driver_unregister(&bfin_bf54x_driver);
774 }
775 
776 MODULE_DESCRIPTION("Blackfin BF54x TFT LCD Driver");
777 MODULE_LICENSE("GPL");
778 
779 module_init(bfin_bf54x_driver_init);
780 module_exit(bfin_bf54x_driver_cleanup);