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 Framebufer 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/fb.h>
  36 #include <linux/init.h>
  37 #include <linux/types.h>
  38 #include <linux/interrupt.h>
  39 #include <linux/device.h>
  40 #include <linux/backlight.h>
  41 #include <linux/lcd.h>
  42 #include <linux/dma-mapping.h>
  43 #include <linux/platform_device.h>
  44
  45 #include <asm/blackfin.h>
  46 #include <asm/irq.h>
  47 #include <asm/dma-mapping.h>
  48 #include <asm/dma.h>
  49 #include <asm/portmux.h>
  50 #include <asm/gptimers.h>
  51
  52 #define NO_BL_SUPPORT
  53
  54 #define LCD_X_RES               320     /* Horizontal Resolution */
  55 #define LCD_Y_RES               240     /* Vertical Resolution */
  56 #define LCD_BPP                 24      /* Bit Per Pixel */
  57
  58 #define DMA_BUS_SIZE            16
  59 #define LCD_CLK                 (12*1000*1000)  /* 12MHz */
  60
  61 #define CLOCKS_PER_PIX          3
  62
  63         /*
  64          * HS and VS timing parameters (all in number of PPI clk ticks)
  65          */
  66
  67 #define U_LINE          1                               /* Blanking Lines */
  68
  69 #define H_ACTPIX        (LCD_X_RES * CLOCKS_PER_PIX)    /* active horizontal pixel */
  70 #define H_PERIOD        (408 * CLOCKS_PER_PIX)          /* HS period */
  71 #define H_PULSE         90                              /* HS pulse width */
  72 #define H_START         204                             /* first valid pixel */
  73
  74 #define V_LINES         (LCD_Y_RES + U_LINE)            /* total vertical lines */
  75 #define V_PULSE         (3 * H_PERIOD)                  /* VS pulse width (1-5 H_PERIODs) */
  76 #define V_PERIOD        (H_PERIOD * V_LINES)            /* VS period */
  77
  78 #define ACTIVE_VIDEO_MEM_OFFSET (U_LINE * H_ACTPIX)
  79
  80 #define BFIN_LCD_NBR_PALETTE_ENTRIES    256
  81
  82 #define DRIVER_NAME "bfin-t350mcqb"
  83 static char driver_name[] = DRIVER_NAME;
  84
  85 struct bfin_t350mcqbfb_info {
  86         struct fb_info *fb;
  87         struct device *dev;
  88         unsigned char *fb_buffer;       /* RGB Buffer */
  89         dma_addr_t dma_handle;
  90         int lq043_open_cnt;
  91         int irq;
  92         spinlock_t lock;        /* lock */
  93         u32 pseudo_pal[16];
  94 };
  95
  96 static int nocursor;
  97 module_param(nocursor, int, 0644);
  98 MODULE_PARM_DESC(nocursor, "cursor enable/disable");
  99
 100 #define PPI_TX_MODE             0x2
 101 #define PPI_XFER_TYPE_11        0xC
 102 #define PPI_PORT_CFG_01         0x10
 103 #define PPI_PACK_EN             0x80
 104 #define PPI_POLS_1              0x8000
 105
 106 static void bfin_t350mcqb_config_ppi(struct bfin_t350mcqbfb_info *fbi)
 107 {
 108         bfin_write_PPI_DELAY(H_START);
 109         bfin_write_PPI_COUNT(H_ACTPIX-1);
 110         bfin_write_PPI_FRAME(V_LINES);
 111
 112         bfin_write_PPI_CONTROL(PPI_TX_MODE |       /* output mode , PORT_DIR */
 113                                 PPI_XFER_TYPE_11 | /* sync mode XFR_TYPE */
 114                                 PPI_PORT_CFG_01 |  /* two frame sync PORT_CFG */
 115                                 PPI_PACK_EN |      /* packing enabled PACK_EN */
 116                                 PPI_POLS_1);       /* faling edge syncs POLS */
 117 }
 118
 119 static inline void bfin_t350mcqb_disable_ppi(void)
 120 {
 121         bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() & ~PORT_EN);
 122 }
 123
 124 static inline void bfin_t350mcqb_enable_ppi(void)
 125 {
 126         bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
 127 }
 128
 129 static void bfin_t350mcqb_start_timers(void)
 130 {
 131         unsigned long flags;
 132
 133         local_irq_save(flags);
 134                 enable_gptimers(TIMER1bit);
 135                 enable_gptimers(TIMER0bit);
 136         local_irq_restore(flags);
 137 }
 138
 139 static void bfin_t350mcqb_stop_timers(void)
 140 {
 141         disable_gptimers(TIMER0bit | TIMER1bit);
 142
 143         set_gptimer_status(0, TIMER_STATUS_TRUN0 | TIMER_STATUS_TRUN1 |
 144                                 TIMER_STATUS_TIMIL0 | TIMER_STATUS_TIMIL1 |
 145                                  TIMER_STATUS_TOVF0 | TIMER_STATUS_TOVF1);
 146
 147 }
 148
 149 static void bfin_t350mcqb_init_timers(void)
 150 {
 151
 152         bfin_t350mcqb_stop_timers();
 153
 154         set_gptimer_period(TIMER0_id, H_PERIOD);
 155         set_gptimer_pwidth(TIMER0_id, H_PULSE);
 156         set_gptimer_config(TIMER0_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT |
 157                                       TIMER_TIN_SEL | TIMER_CLK_SEL|
 158                                       TIMER_EMU_RUN);
 159
 160         set_gptimer_period(TIMER1_id, V_PERIOD);
 161         set_gptimer_pwidth(TIMER1_id, V_PULSE);
 162         set_gptimer_config(TIMER1_id, TIMER_MODE_PWM | TIMER_PERIOD_CNT |
 163                                       TIMER_TIN_SEL | TIMER_CLK_SEL |
 164                                       TIMER_EMU_RUN);
 165
 166 }
 167
 168 static void bfin_t350mcqb_config_dma(struct bfin_t350mcqbfb_info *fbi)
 169 {
 170
 171         set_dma_config(CH_PPI,
 172                        set_bfin_dma_config(DIR_READ, DMA_FLOW_AUTO,
 173                                            INTR_DISABLE, DIMENSION_2D,
 174                                            DATA_SIZE_16,
 175                                            DMA_NOSYNC_KEEP_DMA_BUF));
 176         set_dma_x_count(CH_PPI, (LCD_X_RES * LCD_BPP) / DMA_BUS_SIZE);
 177         set_dma_x_modify(CH_PPI, DMA_BUS_SIZE / 8);
 178         set_dma_y_count(CH_PPI, V_LINES);
 179
 180         set_dma_y_modify(CH_PPI, DMA_BUS_SIZE / 8);
 181         set_dma_start_addr(CH_PPI, (unsigned long)fbi->fb_buffer);
 182
 183 }
 184
 185 static  u16 ppi0_req_8[] = {P_PPI0_CLK, P_PPI0_FS1, P_PPI0_FS2,
 186                             P_PPI0_D0, P_PPI0_D1, P_PPI0_D2,
 187                             P_PPI0_D3, P_PPI0_D4, P_PPI0_D5,
 188                             P_PPI0_D6, P_PPI0_D7, 0};
 189
 190 static int bfin_t350mcqb_request_ports(int action)
 191 {
 192         if (action) {
 193                 if (peripheral_request_list(ppi0_req_8, DRIVER_NAME)) {
 194                         printk(KERN_ERR "Requesting Peripherals faild\n");
 195                         return -EFAULT;
 196                 }
 197         } else
 198                 peripheral_free_list(ppi0_req_8);
 199
 200         return 0;
 201 }
 202
 203 static int bfin_t350mcqb_fb_open(struct fb_info *info, int user)
 204 {
 205         struct bfin_t350mcqbfb_info *fbi = info->par;
 206
 207         spin_lock(&fbi->lock);
 208         fbi->lq043_open_cnt++;
 209
 210         if (fbi->lq043_open_cnt <= 1) {
 211
 212                 bfin_t350mcqb_disable_ppi();
 213                 SSYNC();
 214
 215                 bfin_t350mcqb_config_dma(fbi);
 216                 bfin_t350mcqb_config_ppi(fbi);
 217                 bfin_t350mcqb_init_timers();
 218
 219                 /* start dma */
 220                 enable_dma(CH_PPI);
 221                 bfin_t350mcqb_enable_ppi();
 222                 bfin_t350mcqb_start_timers();
 223         }
 224
 225         spin_unlock(&fbi->lock);
 226
 227         return 0;
 228 }
 229
 230 static int bfin_t350mcqb_fb_release(struct fb_info *info, int user)
 231 {
 232         struct bfin_t350mcqbfb_info *fbi = info->par;
 233
 234         spin_lock(&fbi->lock);
 235
 236         fbi->lq043_open_cnt--;
 237
 238         if (fbi->lq043_open_cnt <= 0) {
 239                 bfin_t350mcqb_disable_ppi();
 240                 SSYNC();
 241                 disable_dma(CH_PPI);
 242                 bfin_t350mcqb_stop_timers();
 243         }
 244
 245         spin_unlock(&fbi->lock);
 246
 247         return 0;
 248 }
 249
 250 static int bfin_t350mcqb_fb_check_var(struct fb_var_screeninfo *var,
 251                                    struct fb_info *info)
 252 {
 253
 254         switch (var->bits_per_pixel) {
 255         case 24:/* TRUECOLOUR, 16m */
 256                 var->red.offset = 0;
 257                 var->green.offset = 8;
 258                 var->blue.offset = 16;
 259                 var->red.length = var->green.length = var->blue.length = 8;
 260                 var->transp.offset = 0;
 261                 var->transp.length = 0;
 262                 var->transp.msb_right = 0;
 263                 var->red.msb_right = 0;
 264                 var->green.msb_right = 0;
 265                 var->blue.msb_right = 0;
 266                 break;
 267         default:
 268                 pr_debug("%s: depth not supported: %u BPP\n", __func__,
 269                          var->bits_per_pixel);
 270                 return -EINVAL;
 271         }
 272
 273         if (info->var.xres != var->xres || info->var.yres != var->yres ||
 274             info->var.xres_virtual != var->xres_virtual ||
 275             info->var.yres_virtual != var->yres_virtual) {
 276                 pr_debug("%s: Resolution not supported: X%u x Y%u \n",
 277                          __func__, var->xres, var->yres);
 278                 return -EINVAL;
 279         }
 280
 281         /*
 282          *  Memory limit
 283          */
 284
 285         if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
 286                 pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
 287                          __func__, var->yres_virtual);
 288                 return -ENOMEM;
 289         }
 290
 291         return 0;
 292 }
 293
 294 int bfin_t350mcqb_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
 295 {
 296         if (nocursor)
 297                 return 0;
 298         else
 299                 return -EINVAL; /* just to force soft_cursor() call */
 300 }
 301
 302 static int bfin_t350mcqb_fb_setcolreg(u_int regno, u_int red, u_int green,
 303                                    u_int blue, u_int transp,
 304                                    struct fb_info *info)
 305 {
 306         if (regno >= BFIN_LCD_NBR_PALETTE_ENTRIES)
 307                 return -EINVAL;
 308
 309         if (info->var.grayscale) {
 310                 /* grayscale = 0.30*R + 0.59*G + 0.11*B */
 311                 red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;
 312         }
 313
 314         if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
 315
 316                 u32 value;
 317                 /* Place color in the pseudopalette */
 318                 if (regno > 16)
 319                         return -EINVAL;
 320
 321                 red >>= (16 - info->var.red.length);
 322                 green >>= (16 - info->var.green.length);
 323                 blue >>= (16 - info->var.blue.length);
 324
 325                 value = (red << info->var.red.offset) |
 326                     (green << info->var.green.offset) |
 327                     (blue << info->var.blue.offset);
 328                 value &= 0xFFFFFF;
 329
 330                 ((u32 *) (info->pseudo_palette))[regno] = value;
 331
 332         }
 333
 334         return 0;
 335 }
 336
 337 static struct fb_ops bfin_t350mcqb_fb_ops = {
 338         .owner = THIS_MODULE,
 339         .fb_open = bfin_t350mcqb_fb_open,
 340         .fb_release = bfin_t350mcqb_fb_release,
 341         .fb_check_var = bfin_t350mcqb_fb_check_var,
 342         .fb_fillrect = cfb_fillrect,
 343         .fb_copyarea = cfb_copyarea,
 344         .fb_imageblit = cfb_imageblit,
 345         .fb_cursor = bfin_t350mcqb_fb_cursor,
 346         .fb_setcolreg = bfin_t350mcqb_fb_setcolreg,
 347 };
 348
 349 #ifndef NO_BL_SUPPORT
 350 static int bl_get_brightness(struct backlight_device *bd)
 351 {
 352         return 0;
 353 }
 354
 355 static const struct backlight_ops bfin_lq043fb_bl_ops = {
 356         .get_brightness = bl_get_brightness,
 357 };
 358
 359 static struct backlight_device *bl_dev;
 360
 361 static int bfin_lcd_get_power(struct lcd_device *dev)
 362 {
 363         return 0;
 364 }
 365
 366 static int bfin_lcd_set_power(struct lcd_device *dev, int power)
 367 {
 368         return 0;
 369 }
 370
 371 static int bfin_lcd_get_contrast(struct lcd_device *dev)
 372 {
 373         return 0;
 374 }
 375
 376 static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
 377 {
 378
 379         return 0;
 380 }
 381
 382 static int bfin_lcd_check_fb(struct lcd_device *dev, struct fb_info *fi)
 383 {
 384         if (!fi || (fi == &bfin_t350mcqb_fb))
 385                 return 1;
 386         return 0;
 387 }
 388
 389 static struct lcd_ops bfin_lcd_ops = {
 390         .get_power = bfin_lcd_get_power,
 391         .set_power = bfin_lcd_set_power,
 392         .get_contrast = bfin_lcd_get_contrast,
 393         .set_contrast = bfin_lcd_set_contrast,
 394         .check_fb = bfin_lcd_check_fb,
 395 };
 396
 397 static struct lcd_device *lcd_dev;
 398 #endif
 399
 400 static irqreturn_t bfin_t350mcqb_irq_error(int irq, void *dev_id)
 401 {
 402         /*struct bfin_t350mcqbfb_info *info = (struct bfin_t350mcqbfb_info *)dev_id;*/
 403
 404         u16 status = bfin_read_PPI_STATUS();
 405         bfin_write_PPI_STATUS(0xFFFF);
 406
 407         if (status) {
 408                 bfin_t350mcqb_disable_ppi();
 409                 disable_dma(CH_PPI);
 410
 411                 /* start dma */
 412                 enable_dma(CH_PPI);
 413                 bfin_t350mcqb_enable_ppi();
 414                 bfin_write_PPI_STATUS(0xFFFF);
 415         }
 416
 417         return IRQ_HANDLED;
 418 }
 419
 420 static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev)
 421 {
 422         struct backlight_properties props;
 423         struct bfin_t350mcqbfb_info *info;
 424         struct fb_info *fbinfo;
 425         int ret;
 426
 427         printk(KERN_INFO DRIVER_NAME ": %dx%d %d-bit RGB FrameBuffer initializing...\n",
 428                                          LCD_X_RES, LCD_Y_RES, LCD_BPP);
 429
 430         if (request_dma(CH_PPI, "CH_PPI") < 0) {
 431                 printk(KERN_ERR DRIVER_NAME
 432                        ": couldn't request CH_PPI DMA\n");
 433                 ret = -EFAULT;
 434                 goto out1;
 435         }
 436
 437         fbinfo =
 438             framebuffer_alloc(sizeof(struct bfin_t350mcqbfb_info), &pdev->dev);
 439         if (!fbinfo) {
 440                 ret = -ENOMEM;
 441                 goto out2;
 442         }
 443
 444         info = fbinfo->par;
 445         info->fb = fbinfo;
 446         info->dev = &pdev->dev;
 447
 448         platform_set_drvdata(pdev, fbinfo);
 449
 450         strcpy(fbinfo->fix.id, driver_name);
 451
 452         fbinfo->fix.type = FB_TYPE_PACKED_PIXELS;
 453         fbinfo->fix.type_aux = 0;
 454         fbinfo->fix.xpanstep = 0;
 455         fbinfo->fix.ypanstep = 0;
 456         fbinfo->fix.ywrapstep = 0;
 457         fbinfo->fix.accel = FB_ACCEL_NONE;
 458         fbinfo->fix.visual = FB_VISUAL_TRUECOLOR;
 459
 460         fbinfo->var.nonstd = 0;
 461         fbinfo->var.activate = FB_ACTIVATE_NOW;
 462         fbinfo->var.height = 53;
 463         fbinfo->var.width = 70;
 464         fbinfo->var.accel_flags = 0;
 465         fbinfo->var.vmode = FB_VMODE_NONINTERLACED;
 466
 467         fbinfo->var.xres = LCD_X_RES;
 468         fbinfo->var.xres_virtual = LCD_X_RES;
 469         fbinfo->var.yres = LCD_Y_RES;
 470         fbinfo->var.yres_virtual = LCD_Y_RES;
 471         fbinfo->var.bits_per_pixel = LCD_BPP;
 472
 473         fbinfo->var.red.offset = 0;
 474         fbinfo->var.green.offset = 8;
 475         fbinfo->var.blue.offset = 16;
 476         fbinfo->var.transp.offset = 0;
 477         fbinfo->var.red.length = 8;
 478         fbinfo->var.green.length = 8;
 479         fbinfo->var.blue.length = 8;
 480         fbinfo->var.transp.length = 0;
 481         fbinfo->fix.smem_len = LCD_X_RES * LCD_Y_RES * LCD_BPP / 8;
 482
 483         fbinfo->fix.line_length = fbinfo->var.xres_virtual *
 484             fbinfo->var.bits_per_pixel / 8;
 485
 486
 487         fbinfo->fbops = &bfin_t350mcqb_fb_ops;
 488         fbinfo->flags = FBINFO_FLAG_DEFAULT;
 489
 490         info->fb_buffer =
 491             dma_alloc_coherent(NULL, fbinfo->fix.smem_len, &info->dma_handle,
 492                                GFP_KERNEL);
 493
 494         if (NULL == info->fb_buffer) {
 495                 printk(KERN_ERR DRIVER_NAME
 496                        ": couldn't allocate dma buffer.\n");
 497                 ret = -ENOMEM;
 498                 goto out3;
 499         }
 500
 501         fbinfo->screen_base = (void *)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
 502         fbinfo->fix.smem_start = (int)info->fb_buffer + ACTIVE_VIDEO_MEM_OFFSET;
 503
 504         fbinfo->fbops = &bfin_t350mcqb_fb_ops;
 505
 506         fbinfo->pseudo_palette = &info->pseudo_pal;
 507
 508         if (fb_alloc_cmap(&fbinfo->cmap, BFIN_LCD_NBR_PALETTE_ENTRIES, 0)
 509             < 0) {
 510                 printk(KERN_ERR DRIVER_NAME
 511                        "Fail to allocate colormap (%d entries)\n",
 512                        BFIN_LCD_NBR_PALETTE_ENTRIES);
 513                 ret = -EFAULT;
 514                 goto out4;
 515         }
 516
 517         if (bfin_t350mcqb_request_ports(1)) {
 518                 printk(KERN_ERR DRIVER_NAME ": couldn't request gpio port.\n");
 519                 ret = -EFAULT;
 520                 goto out6;
 521         }
 522
 523         info->irq = platform_get_irq(pdev, 0);
 524         if (info->irq < 0) {
 525                 ret = -EINVAL;
 526                 goto out7;
 527         }
 528
 529         ret = request_irq(info->irq, bfin_t350mcqb_irq_error, IRQF_DISABLED,
 530                         "PPI ERROR", info);
 531         if (ret < 0) {
 532                 printk(KERN_ERR DRIVER_NAME
 533                        ": unable to request PPI ERROR IRQ\n");
 534                 goto out7;
 535         }
 536
 537         if (register_framebuffer(fbinfo) < 0) {
 538                 printk(KERN_ERR DRIVER_NAME
 539                        ": unable to register framebuffer.\n");
 540                 ret = -EINVAL;
 541                 goto out8;
 542         }
 543 #ifndef NO_BL_SUPPORT
 544         memset(&props, 0, sizeof(struct backlight_properties));
 545         props.max_brightness = 255;
 546         bl_dev = backlight_device_register("bf52x-bl", NULL, NULL,
 547                                            &bfin_lq043fb_bl_ops, &props);
 548         if (IS_ERR(bl_dev)) {
 549                 printk(KERN_ERR DRIVER_NAME
 550                         ": unable to register backlight.\n");
 551                 ret = -EINVAL;
 552                 goto out9;
 553         }
 554
 555         lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops);
 556         lcd_dev->props.max_contrast = 255, printk(KERN_INFO "Done.\n");
 557 #endif
 558
 559         return 0;
 560
 561 out9:
 562         unregister_framebuffer(fbinfo);
 563 out8:
 564         free_irq(info->irq, info);
 565 out7:
 566         bfin_t350mcqb_request_ports(0);
 567 out6:
 568         fb_dealloc_cmap(&fbinfo->cmap);
 569 out4:
 570         dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
 571                           info->dma_handle);
 572 out3:
 573         framebuffer_release(fbinfo);
 574 out2:
 575         free_dma(CH_PPI);
 576 out1:
 577         platform_set_drvdata(pdev, NULL);
 578
 579         return ret;
 580 }
 581
 582 static int __devexit bfin_t350mcqb_remove(struct platform_device *pdev)
 583 {
 584
 585         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 586         struct bfin_t350mcqbfb_info *info = fbinfo->par;
 587
 588         unregister_framebuffer(fbinfo);
 589
 590         free_dma(CH_PPI);
 591         free_irq(info->irq, info);
 592
 593         if (info->fb_buffer != NULL)
 594                 dma_free_coherent(NULL, fbinfo->fix.smem_len, info->fb_buffer,
 595                                   info->dma_handle);
 596
 597         fb_dealloc_cmap(&fbinfo->cmap);
 598
 599 #ifndef NO_BL_SUPPORT
 600         lcd_device_unregister(lcd_dev);
 601         backlight_device_unregister(bl_dev);
 602 #endif
 603
 604         bfin_t350mcqb_request_ports(0);
 605
 606         platform_set_drvdata(pdev, NULL);
 607         framebuffer_release(fbinfo);
 608
 609         printk(KERN_INFO DRIVER_NAME ": Unregister LCD driver.\n");
 610
 611         return 0;
 612 }
 613
 614 #ifdef CONFIG_PM
 615 static int bfin_t350mcqb_suspend(struct platform_device *pdev, pm_message_t state)
 616 {
 617         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 618         struct bfin_t350mcqbfb_info *fbi = fbinfo->par;
 619
 620         if (fbi->lq043_open_cnt) {
 621                 bfin_t350mcqb_disable_ppi();
 622                 disable_dma(CH_PPI);
 623                 bfin_t350mcqb_stop_timers();
 624                 bfin_write_PPI_STATUS(-1);
 625         }
 626
 627
 628         return 0;
 629 }
 630
 631 static int bfin_t350mcqb_resume(struct platform_device *pdev)
 632 {
 633         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 634         struct bfin_t350mcqbfb_info *fbi = fbinfo->par;
 635
 636         if (fbi->lq043_open_cnt) {
 637                 bfin_t350mcqb_config_dma(fbi);
 638                 bfin_t350mcqb_config_ppi(fbi);
 639                 bfin_t350mcqb_init_timers();
 640
 641                 /* start dma */
 642                 enable_dma(CH_PPI);
 643                 bfin_t350mcqb_enable_ppi();
 644                 bfin_t350mcqb_start_timers();
 645         }
 646
 647         return 0;
 648 }
 649 #else
 650 #define bfin_t350mcqb_suspend   NULL
 651 #define bfin_t350mcqb_resume    NULL
 652 #endif
 653
 654 static struct platform_driver bfin_t350mcqb_driver = {
 655         .probe = bfin_t350mcqb_probe,
 656         .remove = __devexit_p(bfin_t350mcqb_remove),
 657         .suspend = bfin_t350mcqb_suspend,
 658         .resume = bfin_t350mcqb_resume,
 659         .driver = {
 660                    .name = DRIVER_NAME,
 661                    .owner = THIS_MODULE,
 662                    },
 663 };
 664
 665 static int __init bfin_t350mcqb_driver_init(void)
 666 {
 667         return platform_driver_register(&bfin_t350mcqb_driver);
 668 }
 669
 670 static void __exit bfin_t350mcqb_driver_cleanup(void)
 671 {
 672         platform_driver_unregister(&bfin_t350mcqb_driver);
 673 }
 674
 675 MODULE_DESCRIPTION("Blackfin TFT LCD Driver");
 676 MODULE_LICENSE("GPL");
 677
 678 module_init(bfin_t350mcqb_driver_init);
 679 module_exit(bfin_t350mcqb_driver_cleanup);