git.oblomov.eu Git - linux-2.6/blob - drivers/video/omap/lcdc.c

   1 /*
   2  * OMAP1 internal LCD controller
   3  *
   4  * Copyright (C) 2004 Nokia Corporation
   5  * Author: Imre Deak <imre.deak@nokia.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2 of the License, or (at your
  10  * option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, write to the Free Software Foundation, Inc.,
  19  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20  */
  21 #include <linux/module.h>
  22 #include <linux/device.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/err.h>
  26 #include <linux/mm.h>
  27 #include <linux/fb.h>
  28 #include <linux/dma-mapping.h>
  29 #include <linux/vmalloc.h>
  30 #include <linux/clk.h>
  31
  32 #include <asm/arch/dma.h>
  33 #include <asm/arch/omapfb.h>
  34
  35 #include <asm/mach-types.h>
  36
  37 #define MODULE_NAME                     "lcdc"
  38
  39 #define OMAP_LCDC_BASE                  0xfffec000
  40 #define OMAP_LCDC_SIZE                  256
  41 #define OMAP_LCDC_IRQ                   INT_LCD_CTRL
  42
  43 #define OMAP_LCDC_CONTROL               (OMAP_LCDC_BASE + 0x00)
  44 #define OMAP_LCDC_TIMING0               (OMAP_LCDC_BASE + 0x04)
  45 #define OMAP_LCDC_TIMING1               (OMAP_LCDC_BASE + 0x08)
  46 #define OMAP_LCDC_TIMING2               (OMAP_LCDC_BASE + 0x0c)
  47 #define OMAP_LCDC_STATUS                (OMAP_LCDC_BASE + 0x10)
  48 #define OMAP_LCDC_SUBPANEL              (OMAP_LCDC_BASE + 0x14)
  49 #define OMAP_LCDC_LINE_INT              (OMAP_LCDC_BASE + 0x18)
  50 #define OMAP_LCDC_DISPLAY_STATUS        (OMAP_LCDC_BASE + 0x1c)
  51
  52 #define OMAP_LCDC_STAT_DONE             (1 << 0)
  53 #define OMAP_LCDC_STAT_VSYNC            (1 << 1)
  54 #define OMAP_LCDC_STAT_SYNC_LOST        (1 << 2)
  55 #define OMAP_LCDC_STAT_ABC              (1 << 3)
  56 #define OMAP_LCDC_STAT_LINE_INT         (1 << 4)
  57 #define OMAP_LCDC_STAT_FUF              (1 << 5)
  58 #define OMAP_LCDC_STAT_LOADED_PALETTE   (1 << 6)
  59
  60 #define OMAP_LCDC_CTRL_LCD_EN           (1 << 0)
  61 #define OMAP_LCDC_CTRL_LCD_TFT          (1 << 7)
  62 #define OMAP_LCDC_CTRL_LINE_IRQ_CLR_SEL (1 << 10)
  63
  64 #define OMAP_LCDC_IRQ_VSYNC             (1 << 2)
  65 #define OMAP_LCDC_IRQ_DONE              (1 << 3)
  66 #define OMAP_LCDC_IRQ_LOADED_PALETTE    (1 << 4)
  67 #define OMAP_LCDC_IRQ_LINE_NIRQ         (1 << 5)
  68 #define OMAP_LCDC_IRQ_LINE              (1 << 6)
  69 #define OMAP_LCDC_IRQ_MASK              (((1 << 5) - 1) << 2)
  70
  71 #define MAX_PALETTE_SIZE                PAGE_SIZE
  72
  73 enum lcdc_load_mode {
  74         OMAP_LCDC_LOAD_PALETTE,
  75         OMAP_LCDC_LOAD_FRAME,
  76         OMAP_LCDC_LOAD_PALETTE_AND_FRAME
  77 };
  78
  79 static struct omap_lcd_controller {
  80         enum omapfb_update_mode update_mode;
  81         int                     ext_mode;
  82
  83         unsigned long           frame_offset;
  84         int                     screen_width;
  85         int                     xres;
  86         int                     yres;
  87
  88         enum omapfb_color_format        color_mode;
  89         int                     bpp;
  90         void                    *palette_virt;
  91         dma_addr_t              palette_phys;
  92         int                     palette_code;
  93         int                     palette_size;
  94
  95         unsigned int            irq_mask;
  96         struct completion       last_frame_complete;
  97         struct completion       palette_load_complete;
  98         struct clk              *lcd_ck;
  99         struct omapfb_device    *fbdev;
 100
 101         void                    (*dma_callback)(void *data);
 102         void                    *dma_callback_data;
 103
 104         int                     fbmem_allocated;
 105         dma_addr_t              vram_phys;
 106         void                    *vram_virt;
 107         unsigned long           vram_size;
 108 } lcdc;
 109
 110 static void inline enable_irqs(int mask)
 111 {
 112         lcdc.irq_mask |= mask;
 113 }
 114
 115 static void inline disable_irqs(int mask)
 116 {
 117         lcdc.irq_mask &= ~mask;
 118 }
 119
 120 static void set_load_mode(enum lcdc_load_mode mode)
 121 {
 122         u32 l;
 123
 124         l = omap_readl(OMAP_LCDC_CONTROL);
 125         l &= ~(3 << 20);
 126         switch (mode) {
 127         case OMAP_LCDC_LOAD_PALETTE:
 128                 l |= 1 << 20;
 129                 break;
 130         case OMAP_LCDC_LOAD_FRAME:
 131                 l |= 2 << 20;
 132                 break;
 133         case OMAP_LCDC_LOAD_PALETTE_AND_FRAME:
 134                 break;
 135         default:
 136                 BUG();
 137         }
 138         omap_writel(l, OMAP_LCDC_CONTROL);
 139 }
 140
 141 static void enable_controller(void)
 142 {
 143         u32 l;
 144
 145         l = omap_readl(OMAP_LCDC_CONTROL);
 146         l |= OMAP_LCDC_CTRL_LCD_EN;
 147         l &= ~OMAP_LCDC_IRQ_MASK;
 148         l |= lcdc.irq_mask | OMAP_LCDC_IRQ_DONE;        /* enabled IRQs */
 149         omap_writel(l, OMAP_LCDC_CONTROL);
 150 }
 151
 152 static void disable_controller_async(void)
 153 {
 154         u32 l;
 155         u32 mask;
 156
 157         l = omap_readl(OMAP_LCDC_CONTROL);
 158         mask = OMAP_LCDC_CTRL_LCD_EN | OMAP_LCDC_IRQ_MASK;
 159         /*
 160          * Preserve the DONE mask, since we still want to get the
 161          * final DONE irq. It will be disabled in the IRQ handler.
 162          */
 163         mask &= ~OMAP_LCDC_IRQ_DONE;
 164         l &= ~mask;
 165         omap_writel(l, OMAP_LCDC_CONTROL);
 166 }
 167
 168 static void disable_controller(void)
 169 {
 170         init_completion(&lcdc.last_frame_complete);
 171         disable_controller_async();
 172         if (!wait_for_completion_timeout(&lcdc.last_frame_complete,
 173                                 msecs_to_jiffies(500)))
 174                 dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n");
 175 }
 176
 177 static void reset_controller(u32 status)
 178 {
 179         static unsigned long reset_count;
 180         static unsigned long last_jiffies;
 181
 182         disable_controller_async();
 183         reset_count++;
 184         if (reset_count == 1 || time_after(jiffies, last_jiffies + HZ)) {
 185                 dev_err(lcdc.fbdev->dev,
 186                           "resetting (status %#010x,reset count %lu)\n",
 187                           status, reset_count);
 188                 last_jiffies = jiffies;
 189         }
 190         if (reset_count < 100) {
 191                 enable_controller();
 192         } else {
 193                 reset_count = 0;
 194                 dev_err(lcdc.fbdev->dev,
 195                         "too many reset attempts, giving up.\n");
 196         }
 197 }
 198
 199 /*
 200  * Configure the LCD DMA according to the current mode specified by parameters
 201  * in lcdc.fbdev and fbdev->var.
 202  */
 203 static void setup_lcd_dma(void)
 204 {
 205         static const int dma_elem_type[] = {
 206                 0,
 207                 OMAP_DMA_DATA_TYPE_S8,
 208                 OMAP_DMA_DATA_TYPE_S16,
 209                 0,
 210                 OMAP_DMA_DATA_TYPE_S32,
 211         };
 212         struct omapfb_plane_struct *plane = lcdc.fbdev->fb_info[0]->par;
 213         struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var;
 214         unsigned long   src;
 215         int             esize, xelem, yelem;
 216
 217         src = lcdc.vram_phys + lcdc.frame_offset;
 218
 219         switch (var->rotate) {
 220         case 0:
 221                 if (plane->info.mirror || (src & 3) ||
 222                     lcdc.color_mode == OMAPFB_COLOR_YUV420 ||
 223                     (lcdc.xres & 1))
 224                         esize = 2;
 225                 else
 226                         esize = 4;
 227                 xelem = lcdc.xres * lcdc.bpp / 8 / esize;
 228                 yelem = lcdc.yres;
 229                 break;
 230         case 90:
 231         case 180:
 232         case 270:
 233                 if (cpu_is_omap15xx()) {
 234                         BUG();
 235                 }
 236                 esize = 2;
 237                 xelem = lcdc.yres * lcdc.bpp / 16;
 238                 yelem = lcdc.xres;
 239                 break;
 240         default:
 241                 BUG();
 242                 return;
 243         }
 244 #ifdef VERBOSE
 245         dev_dbg(lcdc.fbdev->dev,
 246                  "setup_dma: src %#010lx esize %d xelem %d yelem %d\n",
 247                  src, esize, xelem, yelem);
 248 #endif
 249         omap_set_lcd_dma_b1(src, xelem, yelem, dma_elem_type[esize]);
 250         if (!cpu_is_omap15xx()) {
 251                 int bpp = lcdc.bpp;
 252
 253                 /*
 254                  * YUV support is only for external mode when we have the
 255                  * YUV window embedded in a 16bpp frame buffer.
 256                  */
 257                 if (lcdc.color_mode == OMAPFB_COLOR_YUV420)
 258                         bpp = 16;
 259                 /* Set virtual xres elem size */
 260                 omap_set_lcd_dma_b1_vxres(
 261                         lcdc.screen_width * bpp / 8 / esize);
 262                 /* Setup transformations */
 263                 omap_set_lcd_dma_b1_rotation(var->rotate);
 264                 omap_set_lcd_dma_b1_mirror(plane->info.mirror);
 265         }
 266         omap_setup_lcd_dma();
 267 }
 268
 269 static irqreturn_t lcdc_irq_handler(int irq, void *dev_id)
 270 {
 271         u32 status;
 272
 273         status = omap_readl(OMAP_LCDC_STATUS);
 274
 275         if (status & (OMAP_LCDC_STAT_FUF | OMAP_LCDC_STAT_SYNC_LOST))
 276                 reset_controller(status);
 277         else {
 278                 if (status & OMAP_LCDC_STAT_DONE) {
 279                         u32 l;
 280
 281                         /*
 282                          * Disable IRQ_DONE. The status bit will be cleared
 283                          * only when the controller is reenabled and we don't
 284                          * want to get more interrupts.
 285                          */
 286                         l = omap_readl(OMAP_LCDC_CONTROL);
 287                         l &= ~OMAP_LCDC_IRQ_DONE;
 288                         omap_writel(l, OMAP_LCDC_CONTROL);
 289                         complete(&lcdc.last_frame_complete);
 290                 }
 291                 if (status & OMAP_LCDC_STAT_LOADED_PALETTE) {
 292                         disable_controller_async();
 293                         complete(&lcdc.palette_load_complete);
 294                 }
 295         }
 296
 297         /*
 298          * Clear these interrupt status bits.
 299          * Sync_lost, FUF bits were cleared by disabling the LCD controller
 300          * LOADED_PALETTE can be cleared this way only in palette only
 301          * load mode. In other load modes it's cleared by disabling the
 302          * controller.
 303          */
 304         status &= ~(OMAP_LCDC_STAT_VSYNC |
 305                     OMAP_LCDC_STAT_LOADED_PALETTE |
 306                     OMAP_LCDC_STAT_ABC |
 307                     OMAP_LCDC_STAT_LINE_INT);
 308         omap_writel(status, OMAP_LCDC_STATUS);
 309         return IRQ_HANDLED;
 310 }
 311
 312 /*
 313  * Change to a new video mode. We defer this to a later time to avoid any
 314  * flicker and not to mess up the current LCD DMA context. For this we disable
 315  * the LCD controler, which will generate a DONE irq after the last frame has
 316  * been transferred. Then it'll be safe to reconfigure both the LCD controller
 317  * as well as the LCD DMA.
 318  */
 319 static int omap_lcdc_setup_plane(int plane, int channel_out,
 320                                  unsigned long offset, int screen_width,
 321                                  int pos_x, int pos_y, int width, int height,
 322                                  int color_mode)
 323 {
 324         struct fb_var_screeninfo *var = &lcdc.fbdev->fb_info[0]->var;
 325         struct lcd_panel *panel = lcdc.fbdev->panel;
 326         int rot_x, rot_y;
 327
 328         if (var->rotate == 0) {
 329                 rot_x = panel->x_res;
 330                 rot_y = panel->y_res;
 331         } else {
 332                 rot_x = panel->y_res;
 333                 rot_y = panel->x_res;
 334         }
 335         if (plane != 0 || channel_out != 0 || pos_x != 0 || pos_y != 0 ||
 336             width > rot_x || height > rot_y) {
 337 #ifdef VERBOSE
 338                 dev_dbg(lcdc.fbdev->dev,
 339                         "invalid plane params plane %d pos_x %d pos_y %d "
 340                         "w %d h %d\n", plane, pos_x, pos_y, width, height);
 341 #endif
 342                 return -EINVAL;
 343         }
 344
 345         lcdc.frame_offset = offset;
 346         lcdc.xres = width;
 347         lcdc.yres = height;
 348         lcdc.screen_width = screen_width;
 349         lcdc.color_mode = color_mode;
 350
 351         switch (color_mode) {
 352         case OMAPFB_COLOR_CLUT_8BPP:
 353                 lcdc.bpp = 8;
 354                 lcdc.palette_code = 0x3000;
 355                 lcdc.palette_size = 512;
 356                 break;
 357         case OMAPFB_COLOR_RGB565:
 358                 lcdc.bpp = 16;
 359                 lcdc.palette_code = 0x4000;
 360                 lcdc.palette_size = 32;
 361                 break;
 362         case OMAPFB_COLOR_RGB444:
 363                 lcdc.bpp = 16;
 364                 lcdc.palette_code = 0x4000;
 365                 lcdc.palette_size = 32;
 366                 break;
 367         case OMAPFB_COLOR_YUV420:
 368                 if (lcdc.ext_mode) {
 369                         lcdc.bpp = 12;
 370                         break;
 371                 }
 372                 /* fallthrough */
 373         case OMAPFB_COLOR_YUV422:
 374                 if (lcdc.ext_mode) {
 375                         lcdc.bpp = 16;
 376                         break;
 377                 }
 378                 /* fallthrough */
 379         default:
 380                 /* FIXME: other BPPs.
 381                  * bpp1: code  0,     size 256
 382                  * bpp2: code  0x1000 size 256
 383                  * bpp4: code  0x2000 size 256
 384                  * bpp12: code 0x4000 size 32
 385                  */
 386                 dev_dbg(lcdc.fbdev->dev, "invalid color mode %d\n", color_mode);
 387                 BUG();
 388                 return -1;
 389         }
 390
 391         if (lcdc.ext_mode) {
 392                 setup_lcd_dma();
 393                 return 0;
 394         }
 395
 396         if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) {
 397                 disable_controller();
 398                 omap_stop_lcd_dma();
 399                 setup_lcd_dma();
 400                 enable_controller();
 401         }
 402
 403         return 0;
 404 }
 405
 406 static int omap_lcdc_enable_plane(int plane, int enable)
 407 {
 408         dev_dbg(lcdc.fbdev->dev,
 409                 "plane %d enable %d update_mode %d ext_mode %d\n",
 410                 plane, enable, lcdc.update_mode, lcdc.ext_mode);
 411         if (plane != OMAPFB_PLANE_GFX)
 412                 return -EINVAL;
 413
 414         return 0;
 415 }
 416
 417 /*
 418  * Configure the LCD DMA for a palette load operation and do the palette
 419  * downloading synchronously. We don't use the frame+palette load mode of
 420  * the controller, since the palette can always be downloaded seperately.
 421  */
 422 static void load_palette(void)
 423 {
 424         u16     *palette;
 425
 426         palette = (u16 *)lcdc.palette_virt;
 427
 428         *(u16 *)palette &= 0x0fff;
 429         *(u16 *)palette |= lcdc.palette_code;
 430
 431         omap_set_lcd_dma_b1(lcdc.palette_phys,
 432                 lcdc.palette_size / 4 + 1, 1, OMAP_DMA_DATA_TYPE_S32);
 433
 434         omap_set_lcd_dma_single_transfer(1);
 435         omap_setup_lcd_dma();
 436
 437         init_completion(&lcdc.palette_load_complete);
 438         enable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE);
 439         set_load_mode(OMAP_LCDC_LOAD_PALETTE);
 440         enable_controller();
 441         if (!wait_for_completion_timeout(&lcdc.palette_load_complete,
 442                                 msecs_to_jiffies(500)))
 443                 dev_err(lcdc.fbdev->dev, "timeout waiting for FRAME DONE\n");
 444         /* The controller gets disabled in the irq handler */
 445         disable_irqs(OMAP_LCDC_IRQ_LOADED_PALETTE);
 446         omap_stop_lcd_dma();
 447
 448         omap_set_lcd_dma_single_transfer(lcdc.ext_mode);
 449 }
 450
 451 /* Used only in internal controller mode */
 452 static int omap_lcdc_setcolreg(u_int regno, u16 red, u16 green, u16 blue,
 453                                u16 transp, int update_hw_pal)
 454 {
 455         u16 *palette;
 456
 457         if (lcdc.color_mode != OMAPFB_COLOR_CLUT_8BPP || regno > 255)
 458                 return -EINVAL;
 459
 460         palette = (u16 *)lcdc.palette_virt;
 461
 462         palette[regno] &= ~0x0fff;
 463         palette[regno] |= ((red >> 12) << 8) | ((green >> 12) << 4 ) |
 464                            (blue >> 12);
 465
 466         if (update_hw_pal) {
 467                 disable_controller();
 468                 omap_stop_lcd_dma();
 469                 load_palette();
 470                 setup_lcd_dma();
 471                 set_load_mode(OMAP_LCDC_LOAD_FRAME);
 472                 enable_controller();
 473         }
 474
 475         return 0;
 476 }
 477
 478 static void calc_ck_div(int is_tft, int pck, int *pck_div)
 479 {
 480         unsigned long lck;
 481
 482         pck = max(1, pck);
 483         lck = clk_get_rate(lcdc.lcd_ck);
 484         *pck_div = (lck + pck - 1) / pck;
 485         if (is_tft)
 486                 *pck_div = max(2, *pck_div);
 487         else
 488                 *pck_div = max(3, *pck_div);
 489         if (*pck_div > 255) {
 490                 /* FIXME: try to adjust logic clock divider as well */
 491                 *pck_div = 255;
 492                 dev_warn(lcdc.fbdev->dev, "pixclock %d kHz too low.\n",
 493                          pck / 1000);
 494         }
 495 }
 496
 497 static void inline setup_regs(void)
 498 {
 499         u32 l;
 500         struct lcd_panel *panel = lcdc.fbdev->panel;
 501         int is_tft = panel->config & OMAP_LCDC_PANEL_TFT;
 502         unsigned long lck;
 503         int pcd;
 504
 505         l = omap_readl(OMAP_LCDC_CONTROL);
 506         l &= ~OMAP_LCDC_CTRL_LCD_TFT;
 507         l |= is_tft ? OMAP_LCDC_CTRL_LCD_TFT : 0;
 508 #ifdef CONFIG_MACH_OMAP_PALMTE
 509 /* FIXME:if (machine_is_omap_palmte()) { */
 510                 /* PalmTE uses alternate TFT setting in 8BPP mode */
 511                 l |= (is_tft && panel->bpp == 8) ? 0x810000 : 0;
 512 /*      } */
 513 #endif
 514         omap_writel(l, OMAP_LCDC_CONTROL);
 515
 516         l = omap_readl(OMAP_LCDC_TIMING2);
 517         l &= ~(((1 << 6) - 1) << 20);
 518         l |= (panel->config & OMAP_LCDC_SIGNAL_MASK) << 20;
 519         omap_writel(l, OMAP_LCDC_TIMING2);
 520
 521         l = panel->x_res - 1;
 522         l |= (panel->hsw - 1) << 10;
 523         l |= (panel->hfp - 1) << 16;
 524         l |= (panel->hbp - 1) << 24;
 525         omap_writel(l, OMAP_LCDC_TIMING0);
 526
 527         l = panel->y_res - 1;
 528         l |= (panel->vsw - 1) << 10;
 529         l |= panel->vfp << 16;
 530         l |= panel->vbp << 24;
 531         omap_writel(l, OMAP_LCDC_TIMING1);
 532
 533         l = omap_readl(OMAP_LCDC_TIMING2);
 534         l &= ~0xff;
 535
 536         lck = clk_get_rate(lcdc.lcd_ck);
 537
 538         if (!panel->pcd)
 539                 calc_ck_div(is_tft, panel->pixel_clock * 1000, &pcd);
 540         else {
 541                 dev_warn(lcdc.fbdev->dev,
 542                     "Pixel clock divider value is obsolete.\n"
 543                     "Try to set pixel_clock to %lu and pcd to 0 "
 544                     "in drivers/video/omap/lcd_%s.c and submit a patch.\n",
 545                         lck / panel->pcd / 1000, panel->name);
 546
 547                 pcd = panel->pcd;
 548         }
 549         l |= pcd & 0xff;
 550         l |= panel->acb << 8;
 551         omap_writel(l, OMAP_LCDC_TIMING2);
 552
 553         /* update panel info with the exact clock */
 554         panel->pixel_clock = lck / pcd / 1000;
 555 }
 556
 557 /*
 558  * Configure the LCD controller, download the color palette and start a looped
 559  * DMA transfer of the frame image data. Called only in internal
 560  * controller mode.
 561  */
 562 static int omap_lcdc_set_update_mode(enum omapfb_update_mode mode)
 563 {
 564         int r = 0;
 565
 566         if (mode != lcdc.update_mode) {
 567                 switch (mode) {
 568                 case OMAPFB_AUTO_UPDATE:
 569                         setup_regs();
 570                         load_palette();
 571
 572                         /* Setup and start LCD DMA */
 573                         setup_lcd_dma();
 574
 575                         set_load_mode(OMAP_LCDC_LOAD_FRAME);
 576                         enable_irqs(OMAP_LCDC_IRQ_DONE);
 577                         /* This will start the actual DMA transfer */
 578                         enable_controller();
 579                         lcdc.update_mode = mode;
 580                         break;
 581                 case OMAPFB_UPDATE_DISABLED:
 582                         disable_controller();
 583                         omap_stop_lcd_dma();
 584                         lcdc.update_mode = mode;
 585                         break;
 586                 default:
 587                         r = -EINVAL;
 588                 }
 589         }
 590
 591         return r;
 592 }
 593
 594 static enum omapfb_update_mode omap_lcdc_get_update_mode(void)
 595 {
 596         return lcdc.update_mode;
 597 }
 598
 599 /* PM code called only in internal controller mode */
 600 static void omap_lcdc_suspend(void)
 601 {
 602         if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) {
 603                 disable_controller();
 604                 omap_stop_lcd_dma();
 605         }
 606 }
 607
 608 static void omap_lcdc_resume(void)
 609 {
 610         if (lcdc.update_mode == OMAPFB_AUTO_UPDATE) {
 611                 setup_regs();
 612                 load_palette();
 613                 setup_lcd_dma();
 614                 set_load_mode(OMAP_LCDC_LOAD_FRAME);
 615                 enable_irqs(OMAP_LCDC_IRQ_DONE);
 616                 enable_controller();
 617         }
 618 }
 619
 620 static void omap_lcdc_get_caps(int plane, struct omapfb_caps *caps)
 621 {
 622         return;
 623 }
 624
 625 int omap_lcdc_set_dma_callback(void (*callback)(void *data), void *data)
 626 {
 627         BUG_ON(callback == NULL);
 628
 629         if (lcdc.dma_callback)
 630                 return -EBUSY;
 631         else {
 632                 lcdc.dma_callback = callback;
 633                 lcdc.dma_callback_data = data;
 634         }
 635         return 0;
 636 }
 637 EXPORT_SYMBOL(omap_lcdc_set_dma_callback);
 638
 639 void omap_lcdc_free_dma_callback(void)
 640 {
 641         lcdc.dma_callback = NULL;
 642 }
 643 EXPORT_SYMBOL(omap_lcdc_free_dma_callback);
 644
 645 static void lcdc_dma_handler(u16 status, void *data)
 646 {
 647         if (lcdc.dma_callback)
 648                 lcdc.dma_callback(lcdc.dma_callback_data);
 649 }
 650
 651 static int mmap_kern(void)
 652 {
 653         struct vm_struct        *kvma;
 654         struct vm_area_struct   vma;
 655         pgprot_t                pgprot;
 656         unsigned long           vaddr;
 657
 658         kvma = get_vm_area(lcdc.vram_size, VM_IOREMAP);
 659         if (kvma == NULL) {
 660                 dev_err(lcdc.fbdev->dev, "can't get kernel vm area\n");
 661                 return -ENOMEM;
 662         }
 663         vma.vm_mm = &init_mm;
 664
 665         vaddr = (unsigned long)kvma->addr;
 666         vma.vm_start = vaddr;
 667         vma.vm_end = vaddr + lcdc.vram_size;
 668
 669         pgprot = pgprot_writecombine(pgprot_kernel);
 670         if (io_remap_pfn_range(&vma, vaddr,
 671                            lcdc.vram_phys >> PAGE_SHIFT,
 672                            lcdc.vram_size, pgprot) < 0) {
 673                 dev_err(lcdc.fbdev->dev, "kernel mmap for FB memory failed\n");
 674                 return -EAGAIN;
 675         }
 676
 677         lcdc.vram_virt = (void *)vaddr;
 678
 679         return 0;
 680 }
 681
 682 static void unmap_kern(void)
 683 {
 684         vunmap(lcdc.vram_virt);
 685 }
 686
 687 static int alloc_palette_ram(void)
 688 {
 689         lcdc.palette_virt = dma_alloc_writecombine(lcdc.fbdev->dev,
 690                 MAX_PALETTE_SIZE, &lcdc.palette_phys, GFP_KERNEL);
 691         if (lcdc.palette_virt == NULL) {
 692                 dev_err(lcdc.fbdev->dev, "failed to alloc palette memory\n");
 693                 return -ENOMEM;
 694         }
 695         memset(lcdc.palette_virt, 0, MAX_PALETTE_SIZE);
 696
 697         return 0;
 698 }
 699
 700 static void free_palette_ram(void)
 701 {
 702         dma_free_writecombine(lcdc.fbdev->dev, MAX_PALETTE_SIZE,
 703                         lcdc.palette_virt, lcdc.palette_phys);
 704 }
 705
 706 static int alloc_fbmem(struct omapfb_mem_region *region)
 707 {
 708         int bpp;
 709         int frame_size;
 710         struct lcd_panel *panel = lcdc.fbdev->panel;
 711
 712         bpp = panel->bpp;
 713         if (bpp == 12)
 714                 bpp = 16;
 715         frame_size = PAGE_ALIGN(panel->x_res * bpp / 8 * panel->y_res);
 716         if (region->size > frame_size)
 717                 frame_size = region->size;
 718         lcdc.vram_size = frame_size;
 719         lcdc.vram_virt = dma_alloc_writecombine(lcdc.fbdev->dev,
 720                         lcdc.vram_size, &lcdc.vram_phys, GFP_KERNEL);
 721         if (lcdc.vram_virt == NULL) {
 722                 dev_err(lcdc.fbdev->dev, "unable to allocate FB DMA memory\n");
 723                 return -ENOMEM;
 724         }
 725         region->size = frame_size;
 726         region->paddr = lcdc.vram_phys;
 727         region->vaddr = lcdc.vram_virt;
 728         region->alloc = 1;
 729
 730         memset(lcdc.vram_virt, 0, lcdc.vram_size);
 731
 732         return 0;
 733 }
 734
 735 static void free_fbmem(void)
 736 {
 737         dma_free_writecombine(lcdc.fbdev->dev, lcdc.vram_size,
 738                               lcdc.vram_virt, lcdc.vram_phys);
 739 }
 740
 741 static int setup_fbmem(struct omapfb_mem_desc *req_md)
 742 {
 743         int r;
 744
 745         if (!req_md->region_cnt) {
 746                 dev_err(lcdc.fbdev->dev, "no memory regions defined\n");
 747                 return -EINVAL;
 748         }
 749
 750         if (req_md->region_cnt > 1) {
 751                 dev_err(lcdc.fbdev->dev, "only one plane is supported\n");
 752                 req_md->region_cnt = 1;
 753         }
 754
 755         if (req_md->region[0].paddr == 0) {
 756                 lcdc.fbmem_allocated = 1;
 757                 if ((r = alloc_fbmem(&req_md->region[0])) < 0)
 758                         return r;
 759                 return 0;
 760         }
 761
 762         lcdc.vram_phys = req_md->region[0].paddr;
 763         lcdc.vram_size = req_md->region[0].size;
 764
 765         if ((r = mmap_kern()) < 0)
 766                 return r;
 767
 768         dev_dbg(lcdc.fbdev->dev, "vram at %08x size %08lx mapped to 0x%p\n",
 769                  lcdc.vram_phys, lcdc.vram_size, lcdc.vram_virt);
 770
 771         return 0;
 772 }
 773
 774 static void cleanup_fbmem(void)
 775 {
 776         if (lcdc.fbmem_allocated)
 777                 free_fbmem();
 778         else
 779                 unmap_kern();
 780 }
 781
 782 static int omap_lcdc_init(struct omapfb_device *fbdev, int ext_mode,
 783                           struct omapfb_mem_desc *req_vram)
 784 {
 785         int r;
 786         u32 l;
 787         int rate;
 788         struct clk *tc_ck;
 789
 790         lcdc.irq_mask = 0;
 791
 792         lcdc.fbdev = fbdev;
 793         lcdc.ext_mode = ext_mode;
 794
 795         l = 0;
 796         omap_writel(l, OMAP_LCDC_CONTROL);
 797
 798         /* FIXME:
 799          * According to errata some platforms have a clock rate limitiation
 800          */
 801         lcdc.lcd_ck = clk_get(NULL, "lcd_ck");
 802         if (IS_ERR(lcdc.lcd_ck)) {
 803                 dev_err(fbdev->dev, "unable to access LCD clock\n");
 804                 r = PTR_ERR(lcdc.lcd_ck);
 805                 goto fail0;
 806         }
 807
 808         tc_ck = clk_get(NULL, "tc_ck");
 809         if (IS_ERR(tc_ck)) {
 810                 dev_err(fbdev->dev, "unable to access TC clock\n");
 811                 r = PTR_ERR(tc_ck);
 812                 goto fail1;
 813         }
 814
 815         rate = clk_get_rate(tc_ck);
 816         clk_put(tc_ck);
 817
 818         if (machine_is_ams_delta())
 819                 rate /= 4;
 820         if (machine_is_omap_h3())
 821                 rate /= 3;
 822         r = clk_set_rate(lcdc.lcd_ck, rate);
 823         if (r) {
 824                 dev_err(fbdev->dev, "failed to adjust LCD rate\n");
 825                 goto fail1;
 826         }
 827         clk_enable(lcdc.lcd_ck);
 828
 829         r = request_irq(OMAP_LCDC_IRQ, lcdc_irq_handler, 0, MODULE_NAME, fbdev);
 830         if (r) {
 831                 dev_err(fbdev->dev, "unable to get IRQ\n");
 832                 goto fail2;
 833         }
 834
 835         r = omap_request_lcd_dma(lcdc_dma_handler, NULL);
 836         if (r) {
 837                 dev_err(fbdev->dev, "unable to get LCD DMA\n");
 838                 goto fail3;
 839         }
 840
 841         omap_set_lcd_dma_single_transfer(ext_mode);
 842         omap_set_lcd_dma_ext_controller(ext_mode);
 843
 844         if (!ext_mode)
 845                 if ((r = alloc_palette_ram()) < 0)
 846                         goto fail4;
 847
 848         if ((r = setup_fbmem(req_vram)) < 0)
 849                 goto fail5;
 850
 851         pr_info("omapfb: LCDC initialized\n");
 852
 853         return 0;
 854 fail5:
 855         if (!ext_mode)
 856                 free_palette_ram();
 857 fail4:
 858         omap_free_lcd_dma();
 859 fail3:
 860         free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
 861 fail2:
 862         clk_disable(lcdc.lcd_ck);
 863 fail1:
 864         clk_put(lcdc.lcd_ck);
 865 fail0:
 866         return r;
 867 }
 868
 869 static void omap_lcdc_cleanup(void)
 870 {
 871         if (!lcdc.ext_mode)
 872                 free_palette_ram();
 873         cleanup_fbmem();
 874         omap_free_lcd_dma();
 875         free_irq(OMAP_LCDC_IRQ, lcdc.fbdev);
 876         clk_disable(lcdc.lcd_ck);
 877         clk_put(lcdc.lcd_ck);
 878 }
 879
 880 const struct lcd_ctrl omap1_int_ctrl = {
 881         .name                   = "internal",
 882         .init                   = omap_lcdc_init,
 883         .cleanup                = omap_lcdc_cleanup,
 884         .get_caps               = omap_lcdc_get_caps,
 885         .set_update_mode        = omap_lcdc_set_update_mode,
 886         .get_update_mode        = omap_lcdc_get_update_mode,
 887         .update_window          = NULL,
 888         .suspend                = omap_lcdc_suspend,
 889         .resume                 = omap_lcdc_resume,
 890         .setup_plane            = omap_lcdc_setup_plane,
 891         .enable_plane           = omap_lcdc_enable_plane,
 892         .setcolreg              = omap_lcdc_setcolreg,
 893 };