drivers/video/da8xx-fb.c

   1 /*
   2  * Copyright (C) 2008-2009 MontaVista Software Inc.
   3  * Copyright (C) 2008-2009 Texas Instruments Inc
   4  *
   5  * Based on the LCD driver for TI Avalanche processors written by
   6  * Ajay Singh and Shalom Hai.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option)any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  */
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/fb.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/device.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/uaccess.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/clk.h>
  31 #include <linux/cpufreq.h>
  32 #include <linux/console.h>
  33 #include <linux/slab.h>
  34 #include <video/da8xx-fb.h>
  35
  36 #define DRIVER_NAME "da8xx_lcdc"
  37
  38 /* LCD Status Register */
  39 #define LCD_END_OF_FRAME1               BIT(9)
  40 #define LCD_END_OF_FRAME0               BIT(8)
  41 #define LCD_PL_LOAD_DONE                BIT(6)
  42 #define LCD_FIFO_UNDERFLOW              BIT(5)
  43 #define LCD_SYNC_LOST                   BIT(2)
  44
  45 /* LCD DMA Control Register */
  46 #define LCD_DMA_BURST_SIZE(x)           ((x) << 4)
  47 #define LCD_DMA_BURST_1                 0x0
  48 #define LCD_DMA_BURST_2                 0x1
  49 #define LCD_DMA_BURST_4                 0x2
  50 #define LCD_DMA_BURST_8                 0x3
  51 #define LCD_DMA_BURST_16                0x4
  52 #define LCD_END_OF_FRAME_INT_ENA        BIT(2)
  53 #define LCD_DUAL_FRAME_BUFFER_ENABLE    BIT(0)
  54
  55 /* LCD Control Register */
  56 #define LCD_CLK_DIVISOR(x)              ((x) << 8)
  57 #define LCD_RASTER_MODE                 0x01
  58
  59 /* LCD Raster Control Register */
  60 #define LCD_PALETTE_LOAD_MODE(x)        ((x) << 20)
  61 #define PALETTE_AND_DATA                0x00
  62 #define PALETTE_ONLY                    0x01
  63 #define DATA_ONLY                       0x02
  64
  65 #define LCD_MONO_8BIT_MODE              BIT(9)
  66 #define LCD_RASTER_ORDER                BIT(8)
  67 #define LCD_TFT_MODE                    BIT(7)
  68 #define LCD_UNDERFLOW_INT_ENA           BIT(6)
  69 #define LCD_PL_ENABLE                   BIT(4)
  70 #define LCD_MONOCHROME_MODE             BIT(1)
  71 #define LCD_RASTER_ENABLE               BIT(0)
  72 #define LCD_TFT_ALT_ENABLE              BIT(23)
  73 #define LCD_STN_565_ENABLE              BIT(24)
  74
  75 /* LCD Raster Timing 2 Register */
  76 #define LCD_AC_BIAS_TRANSITIONS_PER_INT(x)      ((x) << 16)
  77 #define LCD_AC_BIAS_FREQUENCY(x)                ((x) << 8)
  78 #define LCD_SYNC_CTRL                           BIT(25)
  79 #define LCD_SYNC_EDGE                           BIT(24)
  80 #define LCD_INVERT_PIXEL_CLOCK                  BIT(22)
  81 #define LCD_INVERT_LINE_CLOCK                   BIT(21)
  82 #define LCD_INVERT_FRAME_CLOCK                  BIT(20)
  83
  84 /* LCD Block */
  85 #define  LCD_CTRL_REG                           0x4
  86 #define  LCD_STAT_REG                           0x8
  87 #define  LCD_RASTER_CTRL_REG                    0x28
  88 #define  LCD_RASTER_TIMING_0_REG                0x2C
  89 #define  LCD_RASTER_TIMING_1_REG                0x30
  90 #define  LCD_RASTER_TIMING_2_REG                0x34
  91 #define  LCD_DMA_CTRL_REG                       0x40
  92 #define  LCD_DMA_FRM_BUF_BASE_ADDR_0_REG        0x44
  93 #define  LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG     0x48
  94 #define  LCD_DMA_FRM_BUF_BASE_ADDR_1_REG        0x4C
  95 #define  LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG     0x50
  96
  97 #define LCD_NUM_BUFFERS 2
  98
  99 #define WSI_TIMEOUT     50
 100 #define PALETTE_SIZE    256
 101 #define LEFT_MARGIN     64
 102 #define RIGHT_MARGIN    64
 103 #define UPPER_MARGIN    32
 104 #define LOWER_MARGIN    32
 105
 106 static resource_size_t da8xx_fb_reg_base;
 107 static struct resource *lcdc_regs;
 108
 109 static inline unsigned int lcdc_read(unsigned int addr)
 110 {
 111         return (unsigned int)__raw_readl(da8xx_fb_reg_base + (addr));
 112 }
 113
 114 static inline void lcdc_write(unsigned int val, unsigned int addr)
 115 {
 116         __raw_writel(val, da8xx_fb_reg_base + (addr));
 117 }
 118
 119 struct da8xx_fb_par {
 120         resource_size_t p_palette_base;
 121         unsigned char *v_palette_base;
 122         dma_addr_t              vram_phys;
 123         unsigned long           vram_size;
 124         void                    *vram_virt;
 125         unsigned int            dma_start;
 126         unsigned int            dma_end;
 127         struct clk *lcdc_clk;
 128         int irq;
 129         unsigned short pseudo_palette[16];
 130         unsigned int palette_sz;
 131         unsigned int pxl_clk;
 132         int blank;
 133         wait_queue_head_t       vsync_wait;
 134         int                     vsync_flag;
 135         int                     vsync_timeout;
 136 #ifdef CONFIG_CPU_FREQ
 137         struct notifier_block   freq_transition;
 138 #endif
 139         void (*panel_power_ctrl)(int);
 140 };
 141
 142 /* Variable Screen Information */
 143 static struct fb_var_screeninfo da8xx_fb_var __devinitdata = {
 144         .xoffset = 0,
 145         .yoffset = 0,
 146         .transp = {0, 0, 0},
 147         .nonstd = 0,
 148         .activate = 0,
 149         .height = -1,
 150         .width = -1,
 151         .pixclock = 46666,      /* 46us - AUO display */
 152         .accel_flags = 0,
 153         .left_margin = LEFT_MARGIN,
 154         .right_margin = RIGHT_MARGIN,
 155         .upper_margin = UPPER_MARGIN,
 156         .lower_margin = LOWER_MARGIN,
 157         .sync = 0,
 158         .vmode = FB_VMODE_NONINTERLACED
 159 };
 160
 161 static struct fb_fix_screeninfo da8xx_fb_fix __devinitdata = {
 162         .id = "DA8xx FB Drv",
 163         .type = FB_TYPE_PACKED_PIXELS,
 164         .type_aux = 0,
 165         .visual = FB_VISUAL_PSEUDOCOLOR,
 166         .xpanstep = 0,
 167         .ypanstep = 1,
 168         .ywrapstep = 0,
 169         .accel = FB_ACCEL_NONE
 170 };
 171
 172 struct da8xx_panel {
 173         const char      name[25];       /* Full name <vendor>_<model> */
 174         unsigned short  width;
 175         unsigned short  height;
 176         int             hfp;            /* Horizontal front porch */
 177         int             hbp;            /* Horizontal back porch */
 178         int             hsw;            /* Horizontal Sync Pulse Width */
 179         int             vfp;            /* Vertical front porch */
 180         int             vbp;            /* Vertical back porch */
 181         int             vsw;            /* Vertical Sync Pulse Width */
 182         unsigned int    pxl_clk;        /* Pixel clock */
 183         unsigned char   invert_pxl_clk; /* Invert Pixel clock */
 184 };
 185
 186 static struct da8xx_panel known_lcd_panels[] = {
 187         /* Sharp LCD035Q3DG01 */
 188         [0] = {
 189                 .name = "Sharp_LCD035Q3DG01",
 190                 .width = 320,
 191                 .height = 240,
 192                 .hfp = 8,
 193                 .hbp = 6,
 194                 .hsw = 0,
 195                 .vfp = 2,
 196                 .vbp = 2,
 197                 .vsw = 0,
 198                 .pxl_clk = 4608000,
 199                 .invert_pxl_clk = 1,
 200         },
 201         /* Sharp LK043T1DG01 */
 202         [1] = {
 203                 .name = "Sharp_LK043T1DG01",
 204                 .width = 480,
 205                 .height = 272,
 206                 .hfp = 2,
 207                 .hbp = 2,
 208                 .hsw = 41,
 209                 .vfp = 2,
 210                 .vbp = 2,
 211                 .vsw = 10,
 212                 .pxl_clk = 7833600,
 213                 .invert_pxl_clk = 0,
 214         },
 215 };
 216
 217 /* Enable the Raster Engine of the LCD Controller */
 218 static inline void lcd_enable_raster(void)
 219 {
 220         u32 reg;
 221
 222         reg = lcdc_read(LCD_RASTER_CTRL_REG);
 223         if (!(reg & LCD_RASTER_ENABLE))
 224                 lcdc_write(reg | LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
 225 }
 226
 227 /* Disable the Raster Engine of the LCD Controller */
 228 static inline void lcd_disable_raster(void)
 229 {
 230         u32 reg;
 231
 232         reg = lcdc_read(LCD_RASTER_CTRL_REG);
 233         if (reg & LCD_RASTER_ENABLE)
 234                 lcdc_write(reg & ~LCD_RASTER_ENABLE, LCD_RASTER_CTRL_REG);
 235 }
 236
 237 static void lcd_blit(int load_mode, struct da8xx_fb_par *par)
 238 {
 239         u32 start;
 240         u32 end;
 241         u32 reg_ras;
 242         u32 reg_dma;
 243
 244         /* init reg to clear PLM (loading mode) fields */
 245         reg_ras = lcdc_read(LCD_RASTER_CTRL_REG);
 246         reg_ras &= ~(3 << 20);
 247
 248         reg_dma  = lcdc_read(LCD_DMA_CTRL_REG);
 249
 250         if (load_mode == LOAD_DATA) {
 251                 start    = par->dma_start;
 252                 end      = par->dma_end;
 253
 254                 reg_ras |= LCD_PALETTE_LOAD_MODE(DATA_ONLY);
 255                 reg_dma |= LCD_END_OF_FRAME_INT_ENA;
 256                 reg_dma |= LCD_DUAL_FRAME_BUFFER_ENABLE;
 257
 258                 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
 259                 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
 260                 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
 261                 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
 262         } else if (load_mode == LOAD_PALETTE) {
 263                 start    = par->p_palette_base;
 264                 end      = start + par->palette_sz - 1;
 265
 266                 reg_ras |= LCD_PALETTE_LOAD_MODE(PALETTE_ONLY);
 267                 reg_ras |= LCD_PL_ENABLE;
 268
 269                 lcdc_write(start, LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
 270                 lcdc_write(end, LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
 271         }
 272
 273         lcdc_write(reg_dma, LCD_DMA_CTRL_REG);
 274         lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
 275
 276         /*
 277          * The Raster enable bit must be set after all other control fields are
 278          * set.
 279          */
 280         lcd_enable_raster();
 281 }
 282
 283 /* Configure the Burst Size of DMA */
 284 static int lcd_cfg_dma(int burst_size)
 285 {
 286         u32 reg;
 287
 288         reg = lcdc_read(LCD_DMA_CTRL_REG) & 0x00000001;
 289         switch (burst_size) {
 290         case 1:
 291                 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_1);
 292                 break;
 293         case 2:
 294                 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_2);
 295                 break;
 296         case 4:
 297                 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_4);
 298                 break;
 299         case 8:
 300                 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_8);
 301                 break;
 302         case 16:
 303                 reg |= LCD_DMA_BURST_SIZE(LCD_DMA_BURST_16);
 304                 break;
 305         default:
 306                 return -EINVAL;
 307         }
 308         lcdc_write(reg, LCD_DMA_CTRL_REG);
 309
 310         return 0;
 311 }
 312
 313 static void lcd_cfg_ac_bias(int period, int transitions_per_int)
 314 {
 315         u32 reg;
 316
 317         /* Set the AC Bias Period and Number of Transisitons per Interrupt */
 318         reg = lcdc_read(LCD_RASTER_TIMING_2_REG) & 0xFFF00000;
 319         reg |= LCD_AC_BIAS_FREQUENCY(period) |
 320                 LCD_AC_BIAS_TRANSITIONS_PER_INT(transitions_per_int);
 321         lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
 322 }
 323
 324 static void lcd_cfg_horizontal_sync(int back_porch, int pulse_width,
 325                 int front_porch)
 326 {
 327         u32 reg;
 328
 329         reg = lcdc_read(LCD_RASTER_TIMING_0_REG) & 0xf;
 330         reg |= ((back_porch & 0xff) << 24)
 331             | ((front_porch & 0xff) << 16)
 332             | ((pulse_width & 0x3f) << 10);
 333         lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
 334 }
 335
 336 static void lcd_cfg_vertical_sync(int back_porch, int pulse_width,
 337                 int front_porch)
 338 {
 339         u32 reg;
 340
 341         reg = lcdc_read(LCD_RASTER_TIMING_1_REG) & 0x3ff;
 342         reg |= ((back_porch & 0xff) << 24)
 343             | ((front_porch & 0xff) << 16)
 344             | ((pulse_width & 0x3f) << 10);
 345         lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
 346 }
 347
 348 static int lcd_cfg_display(const struct lcd_ctrl_config *cfg)
 349 {
 350         u32 reg;
 351
 352         reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(LCD_TFT_MODE |
 353                                                 LCD_MONO_8BIT_MODE |
 354                                                 LCD_MONOCHROME_MODE);
 355
 356         switch (cfg->p_disp_panel->panel_shade) {
 357         case MONOCHROME:
 358                 reg |= LCD_MONOCHROME_MODE;
 359                 if (cfg->mono_8bit_mode)
 360                         reg |= LCD_MONO_8BIT_MODE;
 361                 break;
 362         case COLOR_ACTIVE:
 363                 reg |= LCD_TFT_MODE;
 364                 if (cfg->tft_alt_mode)
 365                         reg |= LCD_TFT_ALT_ENABLE;
 366                 break;
 367
 368         case COLOR_PASSIVE:
 369                 if (cfg->stn_565_mode)
 370                         reg |= LCD_STN_565_ENABLE;
 371                 break;
 372
 373         default:
 374                 return -EINVAL;
 375         }
 376
 377         /* enable additional interrupts here */
 378         reg |= LCD_UNDERFLOW_INT_ENA;
 379
 380         lcdc_write(reg, LCD_RASTER_CTRL_REG);
 381
 382         reg = lcdc_read(LCD_RASTER_TIMING_2_REG);
 383
 384         if (cfg->sync_ctrl)
 385                 reg |= LCD_SYNC_CTRL;
 386         else
 387                 reg &= ~LCD_SYNC_CTRL;
 388
 389         if (cfg->sync_edge)
 390                 reg |= LCD_SYNC_EDGE;
 391         else
 392                 reg &= ~LCD_SYNC_EDGE;
 393
 394         if (cfg->invert_line_clock)
 395                 reg |= LCD_INVERT_LINE_CLOCK;
 396         else
 397                 reg &= ~LCD_INVERT_LINE_CLOCK;
 398
 399         if (cfg->invert_frm_clock)
 400                 reg |= LCD_INVERT_FRAME_CLOCK;
 401         else
 402                 reg &= ~LCD_INVERT_FRAME_CLOCK;
 403
 404         lcdc_write(reg, LCD_RASTER_TIMING_2_REG);
 405
 406         return 0;
 407 }
 408
 409 static int lcd_cfg_frame_buffer(struct da8xx_fb_par *par, u32 width, u32 height,
 410                 u32 bpp, u32 raster_order)
 411 {
 412         u32 reg;
 413
 414         /* Set the Panel Width */
 415         /* Pixels per line = (PPL + 1)*16 */
 416         /*0x3F in bits 4..9 gives max horisontal resolution = 1024 pixels*/
 417         width &= 0x3f0;
 418         reg = lcdc_read(LCD_RASTER_TIMING_0_REG);
 419         reg &= 0xfffffc00;
 420         reg |= ((width >> 4) - 1) << 4;
 421         lcdc_write(reg, LCD_RASTER_TIMING_0_REG);
 422
 423         /* Set the Panel Height */
 424         reg = lcdc_read(LCD_RASTER_TIMING_1_REG);
 425         reg = ((height - 1) & 0x3ff) | (reg & 0xfffffc00);
 426         lcdc_write(reg, LCD_RASTER_TIMING_1_REG);
 427
 428         /* Set the Raster Order of the Frame Buffer */
 429         reg = lcdc_read(LCD_RASTER_CTRL_REG) & ~(1 << 8);
 430         if (raster_order)
 431                 reg |= LCD_RASTER_ORDER;
 432         lcdc_write(reg, LCD_RASTER_CTRL_REG);
 433
 434         switch (bpp) {
 435         case 1:
 436         case 2:
 437         case 4:
 438         case 16:
 439                 par->palette_sz = 16 * 2;
 440                 break;
 441
 442         case 8:
 443                 par->palette_sz = 256 * 2;
 444                 break;
 445
 446         default:
 447                 return -EINVAL;
 448         }
 449
 450         return 0;
 451 }
 452
 453 static int fb_setcolreg(unsigned regno, unsigned red, unsigned green,
 454                               unsigned blue, unsigned transp,
 455                               struct fb_info *info)
 456 {
 457         struct da8xx_fb_par *par = info->par;
 458         unsigned short *palette = (unsigned short *) par->v_palette_base;
 459         u_short pal;
 460         int update_hw = 0;
 461
 462         if (regno > 255)
 463                 return 1;
 464
 465         if (info->fix.visual == FB_VISUAL_DIRECTCOLOR)
 466                 return 1;
 467
 468         if (info->var.bits_per_pixel == 8) {
 469                 red >>= 4;
 470                 green >>= 8;
 471                 blue >>= 12;
 472
 473                 pal = (red & 0x0f00);
 474                 pal |= (green & 0x00f0);
 475                 pal |= (blue & 0x000f);
 476
 477                 if (palette[regno] != pal) {
 478                         update_hw = 1;
 479                         palette[regno] = pal;
 480                 }
 481         } else if ((info->var.bits_per_pixel == 16) && regno < 16) {
 482                 red >>= (16 - info->var.red.length);
 483                 red <<= info->var.red.offset;
 484
 485                 green >>= (16 - info->var.green.length);
 486                 green <<= info->var.green.offset;
 487
 488                 blue >>= (16 - info->var.blue.length);
 489                 blue <<= info->var.blue.offset;
 490
 491                 par->pseudo_palette[regno] = red | green | blue;
 492
 493                 if (palette[0] != 0x4000) {
 494                         update_hw = 1;
 495                         palette[0] = 0x4000;
 496                 }
 497         }
 498
 499         /* Update the palette in the h/w as needed. */
 500         if (update_hw)
 501                 lcd_blit(LOAD_PALETTE, par);
 502
 503         return 0;
 504 }
 505
 506 static void lcd_reset(struct da8xx_fb_par *par)
 507 {
 508         /* Disable the Raster if previously Enabled */
 509         lcd_disable_raster();
 510
 511         /* DMA has to be disabled */
 512         lcdc_write(0, LCD_DMA_CTRL_REG);
 513         lcdc_write(0, LCD_RASTER_CTRL_REG);
 514 }
 515
 516 static void lcd_calc_clk_divider(struct da8xx_fb_par *par)
 517 {
 518         unsigned int lcd_clk, div;
 519
 520         lcd_clk = clk_get_rate(par->lcdc_clk);
 521         div = lcd_clk / par->pxl_clk;
 522
 523         /* Configure the LCD clock divisor. */
 524         lcdc_write(LCD_CLK_DIVISOR(div) |
 525                         (LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
 526 }
 527
 528 static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
 529                 struct da8xx_panel *panel)
 530 {
 531         u32 bpp;
 532         int ret = 0;
 533
 534         lcd_reset(par);
 535
 536         /* Calculate the divider */
 537         lcd_calc_clk_divider(par);
 538
 539         if (panel->invert_pxl_clk)
 540                 lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) |
 541                         LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
 542         else
 543                 lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) &
 544                         ~LCD_INVERT_PIXEL_CLOCK), LCD_RASTER_TIMING_2_REG);
 545
 546         /* Configure the DMA burst size. */
 547         ret = lcd_cfg_dma(cfg->dma_burst_sz);
 548         if (ret < 0)
 549                 return ret;
 550
 551         /* Configure the AC bias properties. */
 552         lcd_cfg_ac_bias(cfg->ac_bias, cfg->ac_bias_intrpt);
 553
 554         /* Configure the vertical and horizontal sync properties. */
 555         lcd_cfg_vertical_sync(panel->vbp, panel->vsw, panel->vfp);
 556         lcd_cfg_horizontal_sync(panel->hbp, panel->hsw, panel->hfp);
 557
 558         /* Configure for disply */
 559         ret = lcd_cfg_display(cfg);
 560         if (ret < 0)
 561                 return ret;
 562
 563         if (QVGA != cfg->p_disp_panel->panel_type)
 564                 return -EINVAL;
 565
 566         if (cfg->bpp <= cfg->p_disp_panel->max_bpp &&
 567             cfg->bpp >= cfg->p_disp_panel->min_bpp)
 568                 bpp = cfg->bpp;
 569         else
 570                 bpp = cfg->p_disp_panel->max_bpp;
 571         if (bpp == 12)
 572                 bpp = 16;
 573         ret = lcd_cfg_frame_buffer(par, (unsigned int)panel->width,
 574                                 (unsigned int)panel->height, bpp,
 575                                 cfg->raster_order);
 576         if (ret < 0)
 577                 return ret;
 578
 579         /* Configure FDD */
 580         lcdc_write((lcdc_read(LCD_RASTER_CTRL_REG) & 0xfff00fff) |
 581                        (cfg->fdd << 12), LCD_RASTER_CTRL_REG);
 582
 583         return 0;
 584 }
 585
 586 static irqreturn_t lcdc_irq_handler(int irq, void *arg)
 587 {
 588         struct da8xx_fb_par *par = arg;
 589         u32 stat = lcdc_read(LCD_STAT_REG);
 590         u32 reg_ras;
 591
 592         if ((stat & LCD_SYNC_LOST) && (stat & LCD_FIFO_UNDERFLOW)) {
 593                 lcd_disable_raster();
 594                 lcdc_write(stat, LCD_STAT_REG);
 595                 lcd_enable_raster();
 596         } else if (stat & LCD_PL_LOAD_DONE) {
 597                 /*
 598                  * Must disable raster before changing state of any control bit.
 599                  * And also must be disabled before clearing the PL loading
 600                  * interrupt via the following write to the status register. If
 601                  * this is done after then one gets multiple PL done interrupts.
 602                  */
 603                 lcd_disable_raster();
 604
 605                 lcdc_write(stat, LCD_STAT_REG);
 606
 607                 /* Disable PL completion inerrupt */
 608                 reg_ras  = lcdc_read(LCD_RASTER_CTRL_REG);
 609                 reg_ras &= ~LCD_PL_ENABLE;
 610                 lcdc_write(reg_ras, LCD_RASTER_CTRL_REG);
 611
 612                 /* Setup and start data loading mode */
 613                 lcd_blit(LOAD_DATA, par);
 614         } else {
 615                 lcdc_write(stat, LCD_STAT_REG);
 616
 617                 if (stat & LCD_END_OF_FRAME0) {
 618                         lcdc_write(par->dma_start,
 619                                    LCD_DMA_FRM_BUF_BASE_ADDR_0_REG);
 620                         lcdc_write(par->dma_end,
 621                                    LCD_DMA_FRM_BUF_CEILING_ADDR_0_REG);
 622                         par->vsync_flag = 1;
 623                         wake_up_interruptible(&par->vsync_wait);
 624                 }
 625
 626                 if (stat & LCD_END_OF_FRAME1) {
 627                         lcdc_write(par->dma_start,
 628                                    LCD_DMA_FRM_BUF_BASE_ADDR_1_REG);
 629                         lcdc_write(par->dma_end,
 630                                    LCD_DMA_FRM_BUF_CEILING_ADDR_1_REG);
 631                         par->vsync_flag = 1;
 632                         wake_up_interruptible(&par->vsync_wait);
 633                 }
 634         }
 635
 636         return IRQ_HANDLED;
 637 }
 638
 639 static int fb_check_var(struct fb_var_screeninfo *var,
 640                         struct fb_info *info)
 641 {
 642         int err = 0;
 643
 644         switch (var->bits_per_pixel) {
 645         case 1:
 646         case 8:
 647                 var->red.offset = 0;
 648                 var->red.length = 8;
 649                 var->green.offset = 0;
 650                 var->green.length = 8;
 651                 var->blue.offset = 0;
 652                 var->blue.length = 8;
 653                 var->transp.offset = 0;
 654                 var->transp.length = 0;
 655                 break;
 656         case 4:
 657                 var->red.offset = 0;
 658                 var->red.length = 4;
 659                 var->green.offset = 0;
 660                 var->green.length = 4;
 661                 var->blue.offset = 0;
 662                 var->blue.length = 4;
 663                 var->transp.offset = 0;
 664                 var->transp.length = 0;
 665                 break;
 666         case 16:                /* RGB 565 */
 667                 var->red.offset = 11;
 668                 var->red.length = 5;
 669                 var->green.offset = 5;
 670                 var->green.length = 6;
 671                 var->blue.offset = 0;
 672                 var->blue.length = 5;
 673                 var->transp.offset = 0;
 674                 var->transp.length = 0;
 675                 break;
 676         default:
 677                 err = -EINVAL;
 678         }
 679
 680         var->red.msb_right = 0;
 681         var->green.msb_right = 0;
 682         var->blue.msb_right = 0;
 683         var->transp.msb_right = 0;
 684         return err;
 685 }
 686
 687 #ifdef CONFIG_CPU_FREQ
 688 static int lcd_da8xx_cpufreq_transition(struct notifier_block *nb,
 689                                      unsigned long val, void *data)
 690 {
 691         struct da8xx_fb_par *par;
 692
 693         par = container_of(nb, struct da8xx_fb_par, freq_transition);
 694         if (val == CPUFREQ_PRECHANGE) {
 695                 lcd_disable_raster();
 696         } else if (val == CPUFREQ_POSTCHANGE) {
 697                 lcd_calc_clk_divider(par);
 698                 lcd_enable_raster();
 699         }
 700
 701         return 0;
 702 }
 703
 704 static inline int lcd_da8xx_cpufreq_register(struct da8xx_fb_par *par)
 705 {
 706         par->freq_transition.notifier_call = lcd_da8xx_cpufreq_transition;
 707
 708         return cpufreq_register_notifier(&par->freq_transition,
 709                                          CPUFREQ_TRANSITION_NOTIFIER);
 710 }
 711
 712 static inline void lcd_da8xx_cpufreq_deregister(struct da8xx_fb_par *par)
 713 {
 714         cpufreq_unregister_notifier(&par->freq_transition,
 715                                     CPUFREQ_TRANSITION_NOTIFIER);
 716 }
 717 #endif
 718
 719 static int __devexit fb_remove(struct platform_device *dev)
 720 {
 721         struct fb_info *info = dev_get_drvdata(&dev->dev);
 722
 723         if (info) {
 724                 struct da8xx_fb_par *par = info->par;
 725
 726 #ifdef CONFIG_CPU_FREQ
 727                 lcd_da8xx_cpufreq_deregister(par);
 728 #endif
 729                 if (par->panel_power_ctrl)
 730                         par->panel_power_ctrl(0);
 731
 732                 lcd_disable_raster();
 733                 lcdc_write(0, LCD_RASTER_CTRL_REG);
 734
 735                 /* disable DMA  */
 736                 lcdc_write(0, LCD_DMA_CTRL_REG);
 737
 738                 unregister_framebuffer(info);
 739                 fb_dealloc_cmap(&info->cmap);
 740                 dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
 741                                   par->p_palette_base);
 742                 dma_free_coherent(NULL, par->vram_size, par->vram_virt,
 743                                   par->vram_phys);
 744                 free_irq(par->irq, par);
 745                 clk_disable(par->lcdc_clk);
 746                 clk_put(par->lcdc_clk);
 747                 framebuffer_release(info);
 748                 iounmap((void __iomem *)da8xx_fb_reg_base);
 749                 release_mem_region(lcdc_regs->start, resource_size(lcdc_regs));
 750
 751         }
 752         return 0;
 753 }
 754
 755 /*
 756  * Function to wait for vertical sync which for this LCD peripheral
 757  * translates into waiting for the current raster frame to complete.
 758  */
 759 static int fb_wait_for_vsync(struct fb_info *info)
 760 {
 761         struct da8xx_fb_par *par = info->par;
 762         int ret;
 763
 764         /*
 765          * Set flag to 0 and wait for isr to set to 1. It would seem there is a
 766          * race condition here where the ISR could have occured just before or
 767          * just after this set. But since we are just coarsely waiting for
 768          * a frame to complete then that's OK. i.e. if the frame completed
 769          * just before this code executed then we have to wait another full
 770          * frame time but there is no way to avoid such a situation. On the
 771          * other hand if the frame completed just after then we don't need
 772          * to wait long at all. Either way we are guaranteed to return to the
 773          * user immediately after a frame completion which is all that is
 774          * required.
 775          */
 776         par->vsync_flag = 0;
 777         ret = wait_event_interruptible_timeout(par->vsync_wait,
 778                                                par->vsync_flag != 0,
 779                                                par->vsync_timeout);
 780         if (ret < 0)
 781                 return ret;
 782         if (ret == 0)
 783                 return -ETIMEDOUT;
 784
 785         return 0;
 786 }
 787
 788 static int fb_ioctl(struct fb_info *info, unsigned int cmd,
 789                           unsigned long arg)
 790 {
 791         struct lcd_sync_arg sync_arg;
 792
 793         switch (cmd) {
 794         case FBIOGET_CONTRAST:
 795         case FBIOPUT_CONTRAST:
 796         case FBIGET_BRIGHTNESS:
 797         case FBIPUT_BRIGHTNESS:
 798         case FBIGET_COLOR:
 799         case FBIPUT_COLOR:
 800                 return -ENOTTY;
 801         case FBIPUT_HSYNC:
 802                 if (copy_from_user(&sync_arg, (char *)arg,
 803                                 sizeof(struct lcd_sync_arg)))
 804                         return -EFAULT;
 805                 lcd_cfg_horizontal_sync(sync_arg.back_porch,
 806                                         sync_arg.pulse_width,
 807                                         sync_arg.front_porch);
 808                 break;
 809         case FBIPUT_VSYNC:
 810                 if (copy_from_user(&sync_arg, (char *)arg,
 811                                 sizeof(struct lcd_sync_arg)))
 812                         return -EFAULT;
 813                 lcd_cfg_vertical_sync(sync_arg.back_porch,
 814                                         sync_arg.pulse_width,
 815                                         sync_arg.front_porch);
 816                 break;
 817         case FBIO_WAITFORVSYNC:
 818                 return fb_wait_for_vsync(info);
 819         default:
 820                 return -EINVAL;
 821         }
 822         return 0;
 823 }
 824
 825 static int cfb_blank(int blank, struct fb_info *info)
 826 {
 827         struct da8xx_fb_par *par = info->par;
 828         int ret = 0;
 829
 830         if (par->blank == blank)
 831                 return 0;
 832
 833         par->blank = blank;
 834         switch (blank) {
 835         case FB_BLANK_UNBLANK:
 836                 if (par->panel_power_ctrl)
 837                         par->panel_power_ctrl(1);
 838
 839                 lcd_enable_raster();
 840                 break;
 841         case FB_BLANK_POWERDOWN:
 842                 if (par->panel_power_ctrl)
 843                         par->panel_power_ctrl(0);
 844
 845                 lcd_disable_raster();
 846                 break;
 847         default:
 848                 ret = -EINVAL;
 849         }
 850
 851         return ret;
 852 }
 853
 854 /*
 855  * Set new x,y offsets in the virtual display for the visible area and switch
 856  * to the new mode.
 857  */
 858 static int da8xx_pan_display(struct fb_var_screeninfo *var,
 859                              struct fb_info *fbi)
 860 {
 861         int ret = 0;
 862         struct fb_var_screeninfo new_var;
 863         struct da8xx_fb_par         *par = fbi->par;
 864         struct fb_fix_screeninfo    *fix = &fbi->fix;
 865         unsigned int end;
 866         unsigned int start;
 867
 868         if (var->xoffset != fbi->var.xoffset ||
 869                         var->yoffset != fbi->var.yoffset) {
 870                 memcpy(&new_var, &fbi->var, sizeof(new_var));
 871                 new_var.xoffset = var->xoffset;
 872                 new_var.yoffset = var->yoffset;
 873                 if (fb_check_var(&new_var, fbi))
 874                         ret = -EINVAL;
 875                 else {
 876                         memcpy(&fbi->var, &new_var, sizeof(new_var));
 877
 878                         start   = fix->smem_start +
 879                                 new_var.yoffset * fix->line_length +
 880                                 new_var.xoffset * var->bits_per_pixel / 8;
 881                         end     = start + var->yres * fix->line_length - 1;
 882                         par->dma_start  = start;
 883                         par->dma_end    = end;
 884                 }
 885         }
 886
 887         return ret;
 888 }
 889
 890 static struct fb_ops da8xx_fb_ops = {
 891         .owner = THIS_MODULE,
 892         .fb_check_var = fb_check_var,
 893         .fb_setcolreg = fb_setcolreg,
 894         .fb_pan_display = da8xx_pan_display,
 895         .fb_ioctl = fb_ioctl,
 896         .fb_fillrect = cfb_fillrect,
 897         .fb_copyarea = cfb_copyarea,
 898         .fb_imageblit = cfb_imageblit,
 899         .fb_blank = cfb_blank,
 900 };
 901
 902 static int __init fb_probe(struct platform_device *device)
 903 {
 904         struct da8xx_lcdc_platform_data *fb_pdata =
 905                                                 device->dev.platform_data;
 906         struct lcd_ctrl_config *lcd_cfg;
 907         struct da8xx_panel *lcdc_info;
 908         struct fb_info *da8xx_fb_info;
 909         struct clk *fb_clk = NULL;
 910         struct da8xx_fb_par *par;
 911         resource_size_t len;
 912         int ret, i;
 913
 914         if (fb_pdata == NULL) {
 915                 dev_err(&device->dev, "Can not get platform data\n");
 916                 return -ENOENT;
 917         }
 918
 919         lcdc_regs = platform_get_resource(device, IORESOURCE_MEM, 0);
 920         if (!lcdc_regs) {
 921                 dev_err(&device->dev,
 922                         "Can not get memory resource for LCD controller\n");
 923                 return -ENOENT;
 924         }
 925
 926         len = resource_size(lcdc_regs);
 927
 928         lcdc_regs = request_mem_region(lcdc_regs->start, len, lcdc_regs->name);
 929         if (!lcdc_regs)
 930                 return -EBUSY;
 931
 932         da8xx_fb_reg_base = (resource_size_t)ioremap(lcdc_regs->start, len);
 933         if (!da8xx_fb_reg_base) {
 934                 ret = -EBUSY;
 935                 goto err_request_mem;
 936         }
 937
 938         fb_clk = clk_get(&device->dev, NULL);
 939         if (IS_ERR(fb_clk)) {
 940                 dev_err(&device->dev, "Can not get device clock\n");
 941                 ret = -ENODEV;
 942                 goto err_ioremap;
 943         }
 944         ret = clk_enable(fb_clk);
 945         if (ret)
 946                 goto err_clk_put;
 947
 948         for (i = 0, lcdc_info = known_lcd_panels;
 949                 i < ARRAY_SIZE(known_lcd_panels);
 950                 i++, lcdc_info++) {
 951                 if (strcmp(fb_pdata->type, lcdc_info->name) == 0)
 952                         break;
 953         }
 954
 955         if (i == ARRAY_SIZE(known_lcd_panels)) {
 956                 dev_err(&device->dev, "GLCD: No valid panel found\n");
 957                 ret = -ENODEV;
 958                 goto err_clk_disable;
 959         } else
 960                 dev_info(&device->dev, "GLCD: Found %s panel\n",
 961                                         fb_pdata->type);
 962
 963         lcd_cfg = (struct lcd_ctrl_config *)fb_pdata->controller_data;
 964
 965         da8xx_fb_info = framebuffer_alloc(sizeof(struct da8xx_fb_par),
 966                                         &device->dev);
 967         if (!da8xx_fb_info) {
 968                 dev_dbg(&device->dev, "Memory allocation failed for fb_info\n");
 969                 ret = -ENOMEM;
 970                 goto err_clk_disable;
 971         }
 972
 973         par = da8xx_fb_info->par;
 974         par->lcdc_clk = fb_clk;
 975         par->pxl_clk = lcdc_info->pxl_clk;
 976         if (fb_pdata->panel_power_ctrl) {
 977                 par->panel_power_ctrl = fb_pdata->panel_power_ctrl;
 978                 par->panel_power_ctrl(1);
 979         }
 980
 981         if (lcd_init(par, lcd_cfg, lcdc_info) < 0) {
 982                 dev_err(&device->dev, "lcd_init failed\n");
 983                 ret = -EFAULT;
 984                 goto err_release_fb;
 985         }
 986
 987         /* allocate frame buffer */
 988         par->vram_size = lcdc_info->width * lcdc_info->height * lcd_cfg->bpp;
 989         par->vram_size = PAGE_ALIGN(par->vram_size/8);
 990         par->vram_size = par->vram_size * LCD_NUM_BUFFERS;
 991
 992         par->vram_virt = dma_alloc_coherent(NULL,
 993                                             par->vram_size,
 994                                             (resource_size_t *) &par->vram_phys,
 995                                             GFP_KERNEL | GFP_DMA);
 996         if (!par->vram_virt) {
 997                 dev_err(&device->dev,
 998                         "GLCD: kmalloc for frame buffer failed\n");
 999                 ret = -EINVAL;
1000                 goto err_release_fb;
1001         }
1002
1003         da8xx_fb_info->screen_base = (char __iomem *) par->vram_virt;
1004         da8xx_fb_fix.smem_start    = par->vram_phys;
1005         da8xx_fb_fix.smem_len      = par->vram_size;
1006         da8xx_fb_fix.line_length   = (lcdc_info->width * lcd_cfg->bpp) / 8;
1007
1008         par->dma_start = par->vram_phys;
1009         par->dma_end   = par->dma_start + lcdc_info->height *
1010                 da8xx_fb_fix.line_length - 1;
1011
1012         /* allocate palette buffer */
1013         par->v_palette_base = dma_alloc_coherent(NULL,
1014                                                PALETTE_SIZE,
1015                                                (resource_size_t *)
1016                                                &par->p_palette_base,
1017                                                GFP_KERNEL | GFP_DMA);
1018         if (!par->v_palette_base) {
1019                 dev_err(&device->dev,
1020                         "GLCD: kmalloc for palette buffer failed\n");
1021                 ret = -EINVAL;
1022                 goto err_release_fb_mem;
1023         }
1024         memset(par->v_palette_base, 0, PALETTE_SIZE);
1025
1026         par->irq = platform_get_irq(device, 0);
1027         if (par->irq < 0) {
1028                 ret = -ENOENT;
1029                 goto err_release_pl_mem;
1030         }
1031
1032         ret = request_irq(par->irq, lcdc_irq_handler, 0, DRIVER_NAME, par);
1033         if (ret)
1034                 goto err_release_pl_mem;
1035
1036         /* Initialize par */
1037         da8xx_fb_info->var.bits_per_pixel = lcd_cfg->bpp;
1038
1039         da8xx_fb_var.xres = lcdc_info->width;
1040         da8xx_fb_var.xres_virtual = lcdc_info->width;
1041
1042         da8xx_fb_var.yres         = lcdc_info->height;
1043         da8xx_fb_var.yres_virtual = lcdc_info->height * LCD_NUM_BUFFERS;
1044
1045         da8xx_fb_var.grayscale =
1046             lcd_cfg->p_disp_panel->panel_shade == MONOCHROME ? 1 : 0;
1047         da8xx_fb_var.bits_per_pixel = lcd_cfg->bpp;
1048
1049         da8xx_fb_var.hsync_len = lcdc_info->hsw;
1050         da8xx_fb_var.vsync_len = lcdc_info->vsw;
1051
1052         /* Initialize fbinfo */
1053         da8xx_fb_info->flags = FBINFO_FLAG_DEFAULT;
1054         da8xx_fb_info->fix = da8xx_fb_fix;
1055         da8xx_fb_info->var = da8xx_fb_var;
1056         da8xx_fb_info->fbops = &da8xx_fb_ops;
1057         da8xx_fb_info->pseudo_palette = par->pseudo_palette;
1058         da8xx_fb_info->fix.visual = (da8xx_fb_info->var.bits_per_pixel <= 8) ?
1059                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1060
1061         ret = fb_alloc_cmap(&da8xx_fb_info->cmap, PALETTE_SIZE, 0);
1062         if (ret)
1063                 goto err_free_irq;
1064         da8xx_fb_info->cmap.len = par->palette_sz;
1065
1066         /* initialize var_screeninfo */
1067         da8xx_fb_var.activate = FB_ACTIVATE_FORCE;
1068         fb_set_var(da8xx_fb_info, &da8xx_fb_var);
1069
1070         dev_set_drvdata(&device->dev, da8xx_fb_info);
1071
1072         /* initialize the vsync wait queue */
1073         init_waitqueue_head(&par->vsync_wait);
1074         par->vsync_timeout = HZ / 5;
1075
1076         /* Register the Frame Buffer  */
1077         if (register_framebuffer(da8xx_fb_info) < 0) {
1078                 dev_err(&device->dev,
1079                         "GLCD: Frame Buffer Registration Failed!\n");
1080                 ret = -EINVAL;
1081                 goto err_dealloc_cmap;
1082         }
1083
1084 #ifdef CONFIG_CPU_FREQ
1085         ret = lcd_da8xx_cpufreq_register(par);
1086         if (ret) {
1087                 dev_err(&device->dev, "failed to register cpufreq\n");
1088                 goto err_cpu_freq;
1089         }
1090 #endif
1091         return 0;
1092
1093 #ifdef CONFIG_CPU_FREQ
1094 err_cpu_freq:
1095         unregister_framebuffer(da8xx_fb_info);
1096 #endif
1097
1098 err_dealloc_cmap:
1099         fb_dealloc_cmap(&da8xx_fb_info->cmap);
1100
1101 err_free_irq:
1102         free_irq(par->irq, par);
1103
1104 err_release_pl_mem:
1105         dma_free_coherent(NULL, PALETTE_SIZE, par->v_palette_base,
1106                           par->p_palette_base);
1107
1108 err_release_fb_mem:
1109         dma_free_coherent(NULL, par->vram_size, par->vram_virt, par->vram_phys);
1110
1111 err_release_fb:
1112         framebuffer_release(da8xx_fb_info);
1113
1114 err_clk_disable:
1115         clk_disable(fb_clk);
1116
1117 err_clk_put:
1118         clk_put(fb_clk);
1119
1120 err_ioremap:
1121         iounmap((void __iomem *)da8xx_fb_reg_base);
1122
1123 err_request_mem:
1124         release_mem_region(lcdc_regs->start, len);
1125
1126         return ret;
1127 }
1128
1129 #ifdef CONFIG_PM
1130 static int fb_suspend(struct platform_device *dev, pm_message_t state)
1131 {
1132         struct fb_info *info = platform_get_drvdata(dev);
1133         struct da8xx_fb_par *par = info->par;
1134
1135         acquire_console_sem();
1136         if (par->panel_power_ctrl)
1137                 par->panel_power_ctrl(0);
1138
1139         fb_set_suspend(info, 1);
1140         lcd_disable_raster();
1141         clk_disable(par->lcdc_clk);
1142         release_console_sem();
1143
1144         return 0;
1145 }
1146 static int fb_resume(struct platform_device *dev)
1147 {
1148         struct fb_info *info = platform_get_drvdata(dev);
1149         struct da8xx_fb_par *par = info->par;
1150
1151         acquire_console_sem();
1152         if (par->panel_power_ctrl)
1153                 par->panel_power_ctrl(1);
1154
1155         clk_enable(par->lcdc_clk);
1156         lcd_enable_raster();
1157         fb_set_suspend(info, 0);
1158         release_console_sem();
1159
1160         return 0;
1161 }
1162 #else
1163 #define fb_suspend NULL
1164 #define fb_resume NULL
1165 #endif
1166
1167 static struct platform_driver da8xx_fb_driver = {
1168         .probe = fb_probe,
1169         .remove = fb_remove,
1170         .suspend = fb_suspend,
1171         .resume = fb_resume,
1172         .driver = {
1173                    .name = DRIVER_NAME,
1174                    .owner = THIS_MODULE,
1175                    },
1176 };
1177
1178 static int __init da8xx_fb_init(void)
1179 {
1180         return platform_driver_register(&da8xx_fb_driver);
1181 }
1182
1183 static void __exit da8xx_fb_cleanup(void)
1184 {
1185         platform_driver_unregister(&da8xx_fb_driver);
1186 }
1187
1188 module_init(da8xx_fb_init);
1189 module_exit(da8xx_fb_cleanup);
1190
1191 MODULE_DESCRIPTION("Framebuffer driver for TI da8xx/omap-l1xx");
1192 MODULE_AUTHOR("Texas Instruments");
1193 MODULE_LICENSE("GPL");