drivers/video/bfin-t350mcqb-fb.c

   1 /*
   2  * File:         drivers/video/bfin-t350mcqb-fb.c
   3  * Based on:
   4  * Author:       Michael Hennerich <hennerich@blackfin.uclinux.org>
   5  *
   6  * Created:
   7  * Description:  Blackfin LCD Framebuffer driver
   8  *
   9  *
  10  * Modified:
  11  *               Copyright 2004-2007 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/gfp.h>
  36 #include <linux/fb.h>
  37 #include <linux/init.h>
  38 #include <linux/types.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/device.h>
  41 #include <linux/backlight.h>
  42 #include <linux/lcd.h>
  43 #include <linux/dma-mapping.h>
  44 #include <linux/platform_device.h>
  45
  46 #include <asm/blackfin.h>
  47 #include <asm/irq.h>
  48 #include <asm/dma-mapping.h>
  49 #include <asm/dma.h>
  50 #include <asm/portmux.h>
  51 #include <asm/gptimers.h>
  52
  53 #define NO_BL_SUPPORT
  54
  55 #define LCD_X_RES               320     /* Horizontal Resolution */
  56 #define LCD_Y_RES               240     /* Vertical Resolution */
  57 #define LCD_BPP                 24      /* Bit Per Pixel */
  58
  59 #define DMA_BUS_SIZE            16
  60 #define LCD_CLK                 (12*1000*1000)  /* 12MHz */
  61
  62 #define CLOCKS_PER_PIX          3
  63
  64         /*
  65          * HS and VS timing parameters (all in number of PPI clk ticks)
  66          */
  67
  68 #define U_LINE          1                               /* Blanking Lines */
  69
  70 #define H_ACTPIX        (LCD_X_RES * CLOCKS_PER_PIX)    /* active horizontal pixel */
  71 #define H_PERIOD        (408 * CLOCKS_PER_PIX)          /* HS period */
  72 #define H_PULSE         90                              /* HS pulse width */
  73 #define H_START         204                             /* first valid pixel */
  74
  75 #define V_LINES         (LCD_Y_RES + U_LINE)            /* total vertical lines */
  76 #define V_PULSE         (3 * H_PERIOD)                  /* VS pulse width (1-5 H_PERIODs) */
  77 #define V_PERIOD        (H_PERIOD * V_LINES)            /* VS period */
  78
  79 #define ACTIVE_VIDEO_MEM_OFFSET (U_LINE * H_ACTPIX)
  80
  81 #define BFIN_LCD_NBR_PALETTE_ENTRIES    256
  82
  83 #define DRIVER_NAME "bfin-t350mcqb"
  84 static char driver_name[] = DRIVER_NAME;
  85
  86 struct bfin_t350mcqbfb_info {
  87         struct fb_info *fb;
  88         struct device *dev;
  89         unsigned char *fb_buffer;       /* RGB Buffer */
  90         dma_addr_t dma_handle;
  91         int lq043_open_cnt;
  92         int irq;
  93         spinlock_t lock;        /* lock */
  94         u32 pseudo_pal[16];
  95 };
  96
  97 static int nocursor;
  98 module_param(nocursor, int, 0644);
  99 MODULE_PARM_DESC(nocursor, "cursor enable/disable");
 100
 101 #define PPI_TX_MODE             0x2
 102 #define PPI_XFER_TYPE_11        0xC
 103 #define PPI_PORT_CFG_01         0x10
 104 #define PPI_PACK_EN             0x80
 105 #define PPI_POLS_1              0x8000
 106
 107 static void bfin_t350mcqb_config_ppi(struct bfin_t350mcqbfb_info *fbi)
 108 {
 109         bfin_write_PPI_DELAY(H_START);
 110         bfin_write_PPI_COUNT(H_ACTPIX-1);
 111         bfin_write_PPI_FRAME(V_LINES);
 112
 113         bfin_write_PPI_CONTROL(PPI_TX_MODE |       /* output mode , PORT_DIR */
 114                                 PPI_XFER_TYPE_11 | /* sync mode XFR_TYPE */
 115                                 PPI_PORT_CFG_01 |  /* two frame sync PORT_CFG */
 116                                 PPI_PACK_EN |      /* packing enabled PACK_EN */
 117                                 PPI_POLS_1);       /* faling edge syncs POLS */
 118 }
 119
 120 static inline void bfin_t350mcqb_disable_ppi(void)
 121 {
 122         bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() & ~PORT_EN);
 123 }
 124
 125 static inline void bfin_t350mcqb_enable_ppi(void)
 126 {
 127         bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
 128 }
 129
 130 static void bfin_t350mcqb_start_timers(void)
 131 {
 132         unsigned long flags;
 133
 134         local_irq_save(flags);
 135                 enable_gptimers(TIMER1bit);
 136                 enable_gptimers(TIMER0bit);
 137         local_irq_restore(flags);
 138 }
 139
 140 static void bfin_t350mcqb_stop_timers(void)
 141 {
 142         disable_gptimers(TIMER0bit | TIMER1bit);
 143
 144         set_gptimer_status(0, TIMER_STATUS_TRUN0 | TIMER_STATUS_TRUN1 |
 145                                 TIMER_STATUS_TIMIL0 | TIMER_STATUS_TIMIL1 |
 146                                  TIMER_STATUS_TOVF0 | TIMER_STATUS_TOVF1);
 147
 148 }
 149
 150 static void bfin_t350mcqb_init_timers(void)
 151 {
 152
 153         bfin_t350mcqb_stop_timers();
 154
 155         set_gptimer_period(TIMER0_id, H_PERIOD);
 156         set_gptimer_pwidth(TIMER0_id, H_PULSE);
 157         set_gptimer_config(TIMER0_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT |
 158                                       TIMER_TIN_SEL | TIMER_CLK_SEL|
 159                                       TIMER_EMU_RUN);
 160
 161         set_gptimer_period(TIMER1_id, V_PERIOD);
 162         set_gptimer_pwidth(TIMER1_id, V_PULSE);
 163         set_gptimer_config(TIMER1_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT |
 164                                       TIMER_TIN_SEL | TIMER_CLK_SEL |
 165                                       TIMER_EMU_RUN);
 166
 167 }
 168
 169 static void bfin_t350mcqb_config_dma(struct bfin_t350mcqbfb_info *fbi)
 170 {
 171
 172         set_dma_config(CH_PPI,
 173                        set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
 174                                            INTR_DISABLE, DIMENSION_2D,
 175                                            DATA_SIZE_16,
 176                                            DMA_NOSYNC_KEEP_DMA_BUF));
 177         set_dma_x_count(CH_PPI, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
 178         set_dma_x_modify(CH_PPI, DMA_BUS_SIZE / 8);
 179         set_dma_y_count(CH_PPI, V_LINES);
 180
 181         set_dma_y_modify(CH_PPI, DMA_BUS_SIZE / 8);
 182         set_dma_start_addr(CH_PPI, (unsigned long)fbi->fb_buffer);
 183
 184 }
 185
 186 static  u16 ppi0_req_8[] = {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2,
 187                             P_PPI0_D0, P_PPI0_D1, P_PPI0_D2,
 188                             P_PPI0_D3, P_PPI0_D4, P_PPI0_D5,
 189                             P_PPI0_D6, P_PPI0_D7, 0};
 190
 191 static int bfin_t350mcqb_request_ports(int action)
 192 {
 193         if (action) {
 194                 if (peripheral_request_list(ppi0_req_8, DRIVER_NAME)) {
 195                         printk(KERN_ERR "Requesting Peripherals failed\n");
 196                         return -EFAULT;
 197                 }
 198         } else
 199                 peripheral_free_list(ppi0_req_8);
 200
 201         return 0;
 202 }
 203
 204 static int bfin_t350mcqb_fb_open(struct fb_info *info, int user)
 205 {
 206         struct bfin_t350mcqbfb_info *fbi = info->par;
 207
 208         spin_lock(&fbi->lock);
 209         fbi->lq043_open_cnt++;
 210
 211         if (fbi->lq043_open_cnt <= 1) {
 212
 213                 bfin_t350mcqb_disable_ppi();
 214                 SSYNC();
 215
 216                 bfin_t350mcqb_config_dma(fbi);
 217                 bfin_t350mcqb_config_ppi(fbi);
 218                 bfin_t350mcqb_init_timers();
 219
 220                 /* start dma */
 221                 enable_dma(CH_PPI);
 222                 bfin_t350mcqb_enable_ppi();
 223                 bfin_t350mcqb_start_timers();
 224         }
 225
 226         spin_unlock(&fbi->lock);
 227
 228         return 0;
 229 }
 230
 231 static int bfin_t350mcqb_fb_release(struct fb_info *info, int user)
 232 {
 233         struct bfin_t350mcqbfb_info *fbi = info->par;
 234
 235         spin_lock(&fbi->lock);
 236
 237         fbi->lq043_open_cnt--;
 238
 239         if (fbi->lq043_open_cnt <= 0) {
 240                 bfin_t350mcqb_disable_ppi();
 241                 SSYNC();
 242                 disable_dma(CH_PPI);
 243                 bfin_t350mcqb_stop_timers();
 244         }
 245
 246         spin_unlock(&fbi->lock);
 247
 248         return 0;
 249 }
 250
 251 static int bfin_t350mcqb_fb_check_var(struct fb_var_screeninfo *var,
 252                                    struct fb_info *info)
 253 {
 254
 255         switch (var->bits_per_pixel) {
 256         case 24:/* TRUECOLOUR, 16m */
 257                 var->red.offset = 0;
 258                 var->green.offset = 8;
 259                 var->blue.offset = 16;
 260                 var->red.length = var->green.length = var->blue.length = 8;
 261                 var->transp.offset = 0;
 262                 var->transp.length = 0;
 263                 var->transp.msb_right = 0;
 264                 var->red.msb_right = 0;
 265                 var->green.msb_right = 0;
 266                 var->blue.msb_right = 0;
 267                 break;
 268         default:
 269                 pr_debug("%s: depth not supported: %u BPP\n", __func__,
 270                          var->bits_per_pixel);
 271                 return -EINVAL;
 272         }
 273
 274         if (info->var.xres != var->xres || info->var.yres != var->yres ||
 275             info->var.xres_virtual != var->xres_virtual ||
 276             info->var.yres_virtual != var->yres_virtual) {
 277                 pr_debug("%s: Resolution not supported: X%u x Y%u \n",
 278                          __func__, var->xres, var->yres);
 279                 return -EINVAL;
 280         }
 281
 282         /*
 283          *  Memory limit
 284          */
 285
 286         if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
 287                 pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
 288                          __func__, var->yres_virtual);
 289                 return -ENOMEM;
 290         }
 291
 292         return 0;
 293 }
 294
 295 int bfin_t350mcqb_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 296 {
 297         if (nocursor)
 298                 return 0;
 299         else
 300                 return -EINVAL; /* just to force soft_cursor() call */
 301 }
 302
 303 static int bfin_t350mcqb_fb_setcolreg(u_int regno, u_int red, u_int green,
 304                                    u_int blue, u_int transp,
 305                                    struct fb_info *info)
 306 {
 307         if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
 308                 return -EINVAL;
 309
 310         if (info->var.grayscale) {
 311                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 312                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 313         }
 314
 315         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 316
 317                 u32 value;
 318                 /* Place color in the pseudopalette */
 319                 if (regno > 16)
 320                         return -EINVAL;
 321
 322                 red >>= (16 - info->var.red.length);
 323                 green >>= (16 - info->var.green.length);
 324                 blue >>= (16 - info->var.blue.length);
 325
 326                 value = (red << info->var.red.offset) |
 327                     (green << info->var.green.offset) |
 328                     (blue << info->var.blue.offset);
 329                 value &= 0xFFFFFF;
 330
 331                 ((u32 *) (info->pseudo_palette))[regno] = value;
 332
 333         }
 334
 335         return 0;
 336 }
 337
 338 static struct fb_ops bfin_t350mcqb_fb_ops = {
 339         .owner = THIS_MODULE,
 340         .fb_open = bfin_t350mcqb_fb_open,
 341         .fb_release = bfin_t350mcqb_fb_release,
 342         .fb_check_var = bfin_t350mcqb_fb_check_var,
 343         .fb_fillrect = cfb_fillrect,
 344         .fb_copyarea = cfb_copyarea,
 345         .fb_imageblit = cfb_imageblit,
 346         .fb_cursor = bfin_t350mcqb_fb_cursor,
 347         .fb_setcolreg = bfin_t350mcqb_fb_setcolreg,
 348 };
 349
 350 #ifndef NO_BL_SUPPORT
 351 static int bl_get_brightness(struct backlight_device *bd)
 352 {
 353         return 0;
 354 }
 355
 356 static const struct backlight_ops bfin_lq043fb_bl_ops = {
 357         .get_brightness = bl_get_brightness,
 358 };
 359
 360 static struct backlight_device *bl_dev;
 361
 362 static int bfin_lcd_get_power(struct lcd_device *dev)
 363 {
 364         return 0;
 365 }
 366
 367 static int bfin_lcd_set_power(struct lcd_device *dev, int power)
 368 {
 369         return 0;
 370 }
 371
 372 static int bfin_lcd_get_contrast(struct lcd_device *dev)
 373 {
 374         return 0;
 375 }
 376
 377 static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
 378 {
 379
 380         return 0;
 381 }
 382
 383 static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
 384 {
 385         if (!fi || (fi == &bfin_t350mcqb_fb))
 386                 return 1;
 387         return 0;
 388 }
 389
 390 static struct lcd_ops bfin_lcd_ops = {
 391         .get_power = bfin_lcd_get_power,
 392         .set_power = bfin_lcd_set_power,
 393         .get_contrast = bfin_lcd_get_contrast,
 394         .set_contrast = bfin_lcd_set_contrast,
 395         .check_fb = bfin_lcd_check_fb,
 396 };
 397
 398 static struct lcd_device *lcd_dev;
 399 #endif
 400
 401 static irqreturn_t bfin_t350mcqb_irq_error(int irq, void *dev_id)
 402 {
 403         /*struct bfin_t350mcqbfb_info *info = (struct bfin_t350mcqbfb_info *)dev_id;*/
 404
 405         u16 status = bfin_read_PPI_STATUS();
 406         bfin_write_PPI_STATUS(0xFFFF);
 407
 408         if (status) {
 409                 bfin_t350mcqb_disable_ppi();
 410                 disable_dma(CH_PPI);
 411
 412                 /* start dma */
 413                 enable_dma(CH_PPI);
 414                 bfin_t350mcqb_enable_ppi();
 415                 bfin_write_PPI_STATUS(0xFFFF);
 416         }
 417
 418         return IRQ_HANDLED;
 419 }
 420
 421 static int bfin_t350mcqb_probe(struct platform_device *pdev)
 422 {
 423 #ifndef NO_BL_SUPPORT
 424         struct backlight_properties props;
 425 #endif
 426         struct bfin_t350mcqbfb_info *info;
 427         struct fb_info *fbinfo;
 428         int ret;
 429
 430         printk(KERN_INFO DRIVER_NAME ": %dx%d %d-bit RGB FrameBuffer initializing...\n",
 431                                          LCD_X_RES, LCD_Y_RES, LCD_BPP);
 432
 433         if (request_dma(CH_PPI, "CH_PPI") < 0) {
 434                 printk(KERN_ERR DRIVER_NAME
 435                        ": couldn't request CH_PPI DMA\n");
 436                 ret = -EFAULT;
 437                 goto out1;
 438         }
 439
 440         fbinfo =
 441             framebuffer_alloc(sizeof(struct bfin_t350mcqbfb_info), &pdev->dev);
 442         if (!fbinfo) {
 443                 ret = -ENOMEM;
 444                 goto out2;
 445         }
 446
 447         info = fbinfo->par;
 448         info->fb = fbinfo;
 449         info->dev = &pdev->dev;
 450         spin_lock_init(&info->lock);
 451
 452         platform_set_drvdata(pdev, fbinfo);
 453
 454         strcpy(fbinfo->fix.id, driver_name);
 455
 456         fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
 457         fbinfo->fix.type_aux = 0;
 458         fbinfo->fix.xpanstep = 0;
 459         fbinfo->fix.ypanstep = 0;
 460         fbinfo->fix.ywrapstep = 0;
 461         fbinfo->fix.accel = FB_ACCEL_NONE;
 462         fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
 463
 464         fbinfo->var.nonstd = 0;
 465         fbinfo->var.activate = FB_ACTIVATE_NOW;
 466         fbinfo->var.height = 53;
 467         fbinfo->var.width = 70;
 468         fbinfo->var.accel_flags = 0;
 469         fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
 470
 471         fbinfo->var.xres = LCD_X_RES;
 472         fbinfo->var.xres_virtual = LCD_X_RES;
 473         fbinfo->var.yres = LCD_Y_RES;
 474         fbinfo->var.yres_virtual = LCD_Y_RES;
 475         fbinfo->var.bits_per_pixel = LCD_BPP;
 476
 477         fbinfo->var.red.offset = 0;
 478         fbinfo->var.green.offset = 8;
 479         fbinfo->var.blue.offset = 16;
 480         fbinfo->var.transp.offset = 0;
 481         fbinfo->var.red.length = 8;
 482         fbinfo->var.green.length = 8;
 483         fbinfo->var.blue.length = 8;
 484         fbinfo->var.transp.length = 0;
 485         fbinfo->fix.smem_len = LCD_X_RES * LCD_Y_RES * LCD_BPP / 8;
 486
 487         fbinfo->fix.line_length = fbinfo->var.xres_virtual *
 488             fbinfo->var.bits_per_pixel / 8;
 489
 490
 491         fbinfo->fbops = &bfin_t350mcqb_fb_ops;
 492         fbinfo->flags = FBINFO_FLAG_DEFAULT;
 493
 494         info->fb_buffer = dma_alloc_coherent(NULL, fbinfo->fix.smem_len +
 495                                 ACTIVE_VIDEO_MEM_OFFSET,
 496                                 &info->dma_handle, GFP_KERNEL);
 497
 498         if (NULL == info->fb_buffer) {
 499                 printk(KERN_ERR DRIVER_NAME
 500                        ": couldn't allocate dma buffer.\n");
 501                 ret = -ENOMEM;
 502                 goto out3;
 503         }
 504
 505         fbinfo->screen_base = (void *)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
 506         fbinfo->fix.smem_start = (int)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
 507
 508         fbinfo->fbops = &bfin_t350mcqb_fb_ops;
 509
 510         fbinfo->pseudo_palette = &info->pseudo_pal;
 511
 512         if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
 513             < 0) {
 514                 printk(KERN_ERR DRIVER_NAME
 515                        "Fail to allocate colormap (%d entries)\n",
 516                        BFIN_LCD_NBR_PALETTE_ENTRIES);
 517                 ret = -EFAULT;
 518                 goto out4;
 519         }
 520
 521         if (bfin_t350mcqb_request_ports(1)) {
 522                 printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
 523                 ret = -EFAULT;
 524                 goto out6;
 525         }
 526
 527         info->irq = platform_get_irq(pdev, 0);
 528         if (info->irq < 0) {
 529                 ret = -EINVAL;
 530                 goto out7;
 531         }
 532
 533         ret = request_irq(info->irq, bfin_t350mcqb_irq_error, 0,
 534                         "PPI ERROR", info);
 535         if (ret < 0) {
 536                 printk(KERN_ERR DRIVER_NAME
 537                        ": unable to request PPI ERROR IRQ\n");
 538                 goto out7;
 539         }
 540
 541         if (register_framebuffer(fbinfo) < 0) {
 542                 printk(KERN_ERR DRIVER_NAME
 543                        ": unable to register framebuffer.\n");
 544                 ret = -EINVAL;
 545                 goto out8;
 546         }
 547 #ifndef NO_BL_SUPPORT
 548         memset(&props, 0, sizeof(struct backlight_properties));
 549         props.type = BACKLIGHT_RAW;
 550         props.max_brightness = 255;
 551         bl_dev = backlight_device_register("bf52x-bl", NULL, NULL,
 552                                            &bfin_lq043fb_bl_ops, &props);
 553         if (IS_ERR(bl_dev)) {
 554                 printk(KERN_ERR DRIVER_NAME
 555                         ": unable to register backlight.\n");
 556                 ret = -EINVAL;
 557                 unregister_framebuffer(fbinfo);
 558                 goto out8;
 559         }
 560
 561         lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops);
 562         lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
 563 #endif
 564
 565         return 0;
 566
 567 out8:
 568         free_irq(info->irq, info);
 569 out7:
 570         bfin_t350mcqb_request_ports(0);
 571 out6:
 572         fb_dealloc_cmap(&fbinfo->cmap);
 573 out4:
 574         dma_free_coherent(NULL, fbinfo->fix.smem_len + ACTIVE_VIDEO_MEM_OFFSET,
 575                          info->fb_buffer, info->dma_handle);
 576 out3:
 577         framebuffer_release(fbinfo);
 578 out2:
 579         free_dma(CH_PPI);
 580 out1:
 581
 582         return ret;
 583 }
 584
 585 static int bfin_t350mcqb_remove(struct platform_device *pdev)
 586 {
 587
 588         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 589         struct bfin_t350mcqbfb_info *info = fbinfo->par;
 590
 591         unregister_framebuffer(fbinfo);
 592
 593         free_dma(CH_PPI);
 594         free_irq(info->irq, info);
 595
 596         if (info->fb_buffer != NULL)
 597                 dma_free_coherent(NULL, fbinfo->fix.smem_len +
 598                         ACTIVE_VIDEO_MEM_OFFSET, info->fb_buffer,
 599                         info->dma_handle);
 600
 601         fb_dealloc_cmap(&fbinfo->cmap);
 602
 603 #ifndef NO_BL_SUPPORT
 604         lcd_device_unregister(lcd_dev);
 605         backlight_device_unregister(bl_dev);
 606 #endif
 607
 608         bfin_t350mcqb_request_ports(0);
 609
 610         framebuffer_release(fbinfo);
 611
 612         printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");
 613
 614         return 0;
 615 }
 616
 617 #ifdef CONFIG_PM
 618 static int bfin_t350mcqb_suspend(struct platform_device *pdev, pm_message_t state)
 619 {
 620         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 621         struct bfin_t350mcqbfb_info *fbi = fbinfo->par;
 622
 623         if (fbi->lq043_open_cnt) {
 624                 bfin_t350mcqb_disable_ppi();
 625                 disable_dma(CH_PPI);
 626                 bfin_t350mcqb_stop_timers();
 627                 bfin_write_PPI_STATUS(-1);
 628         }
 629
 630
 631         return 0;
 632 }
 633
 634 static int bfin_t350mcqb_resume(struct platform_device *pdev)
 635 {
 636         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 637         struct bfin_t350mcqbfb_info *fbi = fbinfo->par;
 638
 639         if (fbi->lq043_open_cnt) {
 640                 bfin_t350mcqb_config_dma(fbi);
 641                 bfin_t350mcqb_config_ppi(fbi);
 642                 bfin_t350mcqb_init_timers();
 643
 644                 /* start dma */
 645                 enable_dma(CH_PPI);
 646                 bfin_t350mcqb_enable_ppi();
 647                 bfin_t350mcqb_start_timers();
 648         }
 649
 650         return 0;
 651 }
 652 #else
 653 #define bfin_t350mcqb_suspend   NULL
 654 #define bfin_t350mcqb_resume    NULL
 655 #endif
 656
 657 static struct platform_driver bfin_t350mcqb_driver = {
 658         .probe = bfin_t350mcqb_probe,
 659         .remove = bfin_t350mcqb_remove,
 660         .suspend = bfin_t350mcqb_suspend,
 661         .resume = bfin_t350mcqb_resume,
 662         .driver = {
 663                    .name = DRIVER_NAME,
 664                    .owner = THIS_MODULE,
 665                    },
 666 };
 667 module_platform_driver(bfin_t350mcqb_driver);
 668
 669 MODULE_DESCRIPTION("Blackfin TFT LCD Driver");
 670 MODULE_LICENSE("GPL");