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   1 /* linux/drivers/video/s3c2410fb.c
   2  *      Copyright (c) 2004,2005 Arnaud Patard
   3  *      Copyright (c) 2004-2008 Ben Dooks
   4  *
   5  * S3C2410 LCD Framebuffer Driver
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file COPYING in the main directory of this archive for
   9  * more details.
  10  *
  11  * Driver based on skeletonfb.c, sa1100fb.c and others.
  12 */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/string.h>
  18 #include <linux/mm.h>
  19 #include <linux/slab.h>
  20 #include <linux/delay.h>
  21 #include <linux/fb.h>
  22 #include <linux/init.h>
  23 #include <linux/dma-mapping.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/clk.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/div64.h>
  30
  31 #include <asm/mach/map.h>
  32 #include <mach/regs-lcd.h>
  33 #include <mach/regs-gpio.h>
  34 #include <mach/fb.h>
  35
  36 #ifdef CONFIG_PM
  37 #include <linux/pm.h>
  38 #endif
  39
  40 #include "s3c2410fb.h"
  41
  42 /* Debugging stuff */
  43 #ifdef CONFIG_FB_S3C2410_DEBUG
  44 static int debug        = 1;
  45 #else
  46 static int debug        = 0;
  47 #endif
  48
  49 #define dprintk(msg...) if (debug) { printk(KERN_DEBUG "s3c2410fb: " msg); }
  50
  51 /* useful functions */
  52
  53 static int is_s3c2412(struct s3c2410fb_info *fbi)
  54 {
  55         return (fbi->drv_type == DRV_S3C2412);
  56 }
  57
  58 /* s3c2410fb_set_lcdaddr
  59  *
  60  * initialise lcd controller address pointers
  61  */
  62 static void s3c2410fb_set_lcdaddr(struct fb_info *info)
  63 {
  64         unsigned long saddr1, saddr2, saddr3;
  65         struct s3c2410fb_info *fbi = info->par;
  66         void __iomem *regs = fbi->io;
  67
  68         saddr1  = info->fix.smem_start >> 1;
  69         saddr2  = info->fix.smem_start;
  70         saddr2 += info->fix.line_length * info->var.yres;
  71         saddr2 >>= 1;
  72
  73         saddr3 = S3C2410_OFFSIZE(0) |
  74                  S3C2410_PAGEWIDTH((info->fix.line_length / 2) & 0x3ff);
  75
  76         dprintk("LCDSADDR1 = 0x%08lx\n", saddr1);
  77         dprintk("LCDSADDR2 = 0x%08lx\n", saddr2);
  78         dprintk("LCDSADDR3 = 0x%08lx\n", saddr3);
  79
  80         writel(saddr1, regs + S3C2410_LCDSADDR1);
  81         writel(saddr2, regs + S3C2410_LCDSADDR2);
  82         writel(saddr3, regs + S3C2410_LCDSADDR3);
  83 }
  84
  85 /* s3c2410fb_calc_pixclk()
  86  *
  87  * calculate divisor for clk->pixclk
  88  */
  89 static unsigned int s3c2410fb_calc_pixclk(struct s3c2410fb_info *fbi,
  90                                           unsigned long pixclk)
  91 {
  92         unsigned long clk = clk_get_rate(fbi->clk);
  93         unsigned long long div;
  94
  95         /* pixclk is in picoseconds, our clock is in Hz
  96          *
  97          * Hz -> picoseconds is / 10^-12
  98          */
  99
 100         div = (unsigned long long)clk * pixclk;
 101         div >>= 12;                     /* div / 2^12 */
 102         do_div(div, 625 * 625UL * 625); /* div / 5^12 */
 103
 104         dprintk("pixclk %ld, divisor is %ld\n", pixclk, (long)div);
 105         return div;
 106 }
 107
 108 /*
 109  *      s3c2410fb_check_var():
 110  *      Get the video params out of 'var'. If a value doesn't fit, round it up,
 111  *      if it's too big, return -EINVAL.
 112  *
 113  */
 114 static int s3c2410fb_check_var(struct fb_var_screeninfo *var,
 115                                struct fb_info *info)
 116 {
 117         struct s3c2410fb_info *fbi = info->par;
 118         struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
 119         struct s3c2410fb_display *display = NULL;
 120         struct s3c2410fb_display *default_display = mach_info->displays +
 121                                                     mach_info->default_display;
 122         int type = default_display->type;
 123         unsigned i;
 124
 125         dprintk("check_var(var=%p, info=%p)\n", var, info);
 126
 127         /* validate x/y resolution */
 128         /* choose default mode if possible */
 129         if (var->yres == default_display->yres &&
 130             var->xres == default_display->xres &&
 131             var->bits_per_pixel == default_display->bpp)
 132                 display = default_display;
 133         else
 134                 for (i = 0; i < mach_info->num_displays; i++)
 135                         if (type == mach_info->displays[i].type &&
 136                             var->yres == mach_info->displays[i].yres &&
 137                             var->xres == mach_info->displays[i].xres &&
 138                             var->bits_per_pixel == mach_info->displays[i].bpp) {
 139                                 display = mach_info->displays + i;
 140                                 break;
 141                         }
 142
 143         if (!display) {
 144                 dprintk("wrong resolution or depth %dx%d at %d bpp\n",
 145                         var->xres, var->yres, var->bits_per_pixel);
 146                 return -EINVAL;
 147         }
 148
 149         /* it is always the size as the display */
 150         var->xres_virtual = display->xres;
 151         var->yres_virtual = display->yres;
 152         var->height = display->height;
 153         var->width = display->width;
 154
 155         /* copy lcd settings */
 156         var->pixclock = display->pixclock;
 157         var->left_margin = display->left_margin;
 158         var->right_margin = display->right_margin;
 159         var->upper_margin = display->upper_margin;
 160         var->lower_margin = display->lower_margin;
 161         var->vsync_len = display->vsync_len;
 162         var->hsync_len = display->hsync_len;
 163
 164         fbi->regs.lcdcon5 = display->lcdcon5;
 165         /* set display type */
 166         fbi->regs.lcdcon1 = display->type;
 167
 168         var->transp.offset = 0;
 169         var->transp.length = 0;
 170         /* set r/g/b positions */
 171         switch (var->bits_per_pixel) {
 172         case 1:
 173         case 2:
 174         case 4:
 175                 var->red.offset = 0;
 176                 var->red.length = var->bits_per_pixel;
 177                 var->green      = var->red;
 178                 var->blue       = var->red;
 179                 break;
 180         case 8:
 181                 if (display->type != S3C2410_LCDCON1_TFT) {
 182                         /* 8 bpp 332 */
 183                         var->red.length         = 3;
 184                         var->red.offset         = 5;
 185                         var->green.length       = 3;
 186                         var->green.offset       = 2;
 187                         var->blue.length        = 2;
 188                         var->blue.offset        = 0;
 189                 } else {
 190                         var->red.offset         = 0;
 191                         var->red.length         = 8;
 192                         var->green              = var->red;
 193                         var->blue               = var->red;
 194                 }
 195                 break;
 196         case 12:
 197                 /* 12 bpp 444 */
 198                 var->red.length         = 4;
 199                 var->red.offset         = 8;
 200                 var->green.length       = 4;
 201                 var->green.offset       = 4;
 202                 var->blue.length        = 4;
 203                 var->blue.offset        = 0;
 204                 break;
 205
 206         default:
 207         case 16:
 208                 if (display->lcdcon5 & S3C2410_LCDCON5_FRM565) {
 209                         /* 16 bpp, 565 format */
 210                         var->red.offset         = 11;
 211                         var->green.offset       = 5;
 212                         var->blue.offset        = 0;
 213                         var->red.length         = 5;
 214                         var->green.length       = 6;
 215                         var->blue.length        = 5;
 216                 } else {
 217                         /* 16 bpp, 5551 format */
 218                         var->red.offset         = 11;
 219                         var->green.offset       = 6;
 220                         var->blue.offset        = 1;
 221                         var->red.length         = 5;
 222                         var->green.length       = 5;
 223                         var->blue.length        = 5;
 224                 }
 225                 break;
 226         case 32:
 227                 /* 24 bpp 888 and 8 dummy */
 228                 var->red.length         = 8;
 229                 var->red.offset         = 16;
 230                 var->green.length       = 8;
 231                 var->green.offset       = 8;
 232                 var->blue.length        = 8;
 233                 var->blue.offset        = 0;
 234                 break;
 235         }
 236         return 0;
 237 }
 238
 239 /* s3c2410fb_calculate_stn_lcd_regs
 240  *
 241  * calculate register values from var settings
 242  */
 243 static void s3c2410fb_calculate_stn_lcd_regs(const struct fb_info *info,
 244                                              struct s3c2410fb_hw *regs)
 245 {
 246         const struct s3c2410fb_info *fbi = info->par;
 247         const struct fb_var_screeninfo *var = &info->var;
 248         int type = regs->lcdcon1 & ~S3C2410_LCDCON1_TFT;
 249         int hs = var->xres >> 2;
 250         unsigned wdly = (var->left_margin >> 4) - 1;
 251         unsigned wlh = (var->hsync_len >> 4) - 1;
 252
 253         if (type != S3C2410_LCDCON1_STN4)
 254                 hs >>= 1;
 255
 256         switch (var->bits_per_pixel) {
 257         case 1:
 258                 regs->lcdcon1 |= S3C2410_LCDCON1_STN1BPP;
 259                 break;
 260         case 2:
 261                 regs->lcdcon1 |= S3C2410_LCDCON1_STN2GREY;
 262                 break;
 263         case 4:
 264                 regs->lcdcon1 |= S3C2410_LCDCON1_STN4GREY;
 265                 break;
 266         case 8:
 267                 regs->lcdcon1 |= S3C2410_LCDCON1_STN8BPP;
 268                 hs *= 3;
 269                 break;
 270         case 12:
 271                 regs->lcdcon1 |= S3C2410_LCDCON1_STN12BPP;
 272                 hs *= 3;
 273                 break;
 274
 275         default:
 276                 /* invalid pixel depth */
 277                 dev_err(fbi->dev, "invalid bpp %d\n",
 278                         var->bits_per_pixel);
 279         }
 280         /* update X/Y info */
 281         dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
 282                 var->left_margin, var->right_margin, var->hsync_len);
 283
 284         regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1);
 285
 286         if (wdly > 3)
 287                 wdly = 3;
 288
 289         if (wlh > 3)
 290                 wlh = 3;
 291
 292         regs->lcdcon3 = S3C2410_LCDCON3_WDLY(wdly) |
 293                         S3C2410_LCDCON3_LINEBLANK(var->right_margin / 8) |
 294                         S3C2410_LCDCON3_HOZVAL(hs - 1);
 295
 296         regs->lcdcon4 = S3C2410_LCDCON4_WLH(wlh);
 297 }
 298
 299 /* s3c2410fb_calculate_tft_lcd_regs
 300  *
 301  * calculate register values from var settings
 302  */
 303 static void s3c2410fb_calculate_tft_lcd_regs(const struct fb_info *info,
 304                                              struct s3c2410fb_hw *regs)
 305 {
 306         const struct s3c2410fb_info *fbi = info->par;
 307         const struct fb_var_screeninfo *var = &info->var;
 308
 309         switch (var->bits_per_pixel) {
 310         case 1:
 311                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT1BPP;
 312                 break;
 313         case 2:
 314                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT2BPP;
 315                 break;
 316         case 4:
 317                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT4BPP;
 318                 break;
 319         case 8:
 320                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT8BPP;
 321                 regs->lcdcon5 |= S3C2410_LCDCON5_BSWP |
 322                                  S3C2410_LCDCON5_FRM565;
 323                 regs->lcdcon5 &= ~S3C2410_LCDCON5_HWSWP;
 324                 break;
 325         case 16:
 326                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT16BPP;
 327                 regs->lcdcon5 &= ~S3C2410_LCDCON5_BSWP;
 328                 regs->lcdcon5 |= S3C2410_LCDCON5_HWSWP;
 329                 break;
 330         case 32:
 331                 regs->lcdcon1 |= S3C2410_LCDCON1_TFT24BPP;
 332                 regs->lcdcon5 &= ~(S3C2410_LCDCON5_BSWP |
 333                                    S3C2410_LCDCON5_HWSWP |
 334                                    S3C2410_LCDCON5_BPP24BL);
 335                 break;
 336         default:
 337                 /* invalid pixel depth */
 338                 dev_err(fbi->dev, "invalid bpp %d\n",
 339                         var->bits_per_pixel);
 340         }
 341         /* update X/Y info */
 342         dprintk("setting vert: up=%d, low=%d, sync=%d\n",
 343                 var->upper_margin, var->lower_margin, var->vsync_len);
 344
 345         dprintk("setting horz: lft=%d, rt=%d, sync=%d\n",
 346                 var->left_margin, var->right_margin, var->hsync_len);
 347
 348         regs->lcdcon2 = S3C2410_LCDCON2_LINEVAL(var->yres - 1) |
 349                         S3C2410_LCDCON2_VBPD(var->upper_margin - 1) |
 350                         S3C2410_LCDCON2_VFPD(var->lower_margin - 1) |
 351                         S3C2410_LCDCON2_VSPW(var->vsync_len - 1);
 352
 353         regs->lcdcon3 = S3C2410_LCDCON3_HBPD(var->right_margin - 1) |
 354                         S3C2410_LCDCON3_HFPD(var->left_margin - 1) |
 355                         S3C2410_LCDCON3_HOZVAL(var->xres - 1);
 356
 357         regs->lcdcon4 = S3C2410_LCDCON4_HSPW(var->hsync_len - 1);
 358 }
 359
 360 /* s3c2410fb_activate_var
 361  *
 362  * activate (set) the controller from the given framebuffer
 363  * information
 364  */
 365 static void s3c2410fb_activate_var(struct fb_info *info)
 366 {
 367         struct s3c2410fb_info *fbi = info->par;
 368         void __iomem *regs = fbi->io;
 369         int type = fbi->regs.lcdcon1 & S3C2410_LCDCON1_TFT;
 370         struct fb_var_screeninfo *var = &info->var;
 371         int clkdiv = s3c2410fb_calc_pixclk(fbi, var->pixclock) / 2;
 372
 373         dprintk("%s: var->xres  = %d\n", __func__, var->xres);
 374         dprintk("%s: var->yres  = %d\n", __func__, var->yres);
 375         dprintk("%s: var->bpp   = %d\n", __func__, var->bits_per_pixel);
 376
 377         if (type == S3C2410_LCDCON1_TFT) {
 378                 s3c2410fb_calculate_tft_lcd_regs(info, &fbi->regs);
 379                 --clkdiv;
 380                 if (clkdiv < 0)
 381                         clkdiv = 0;
 382         } else {
 383                 s3c2410fb_calculate_stn_lcd_regs(info, &fbi->regs);
 384                 if (clkdiv < 2)
 385                         clkdiv = 2;
 386         }
 387
 388         fbi->regs.lcdcon1 |=  S3C2410_LCDCON1_CLKVAL(clkdiv);
 389
 390         /* write new registers */
 391
 392         dprintk("new register set:\n");
 393         dprintk("lcdcon[1] = 0x%08lx\n", fbi->regs.lcdcon1);
 394         dprintk("lcdcon[2] = 0x%08lx\n", fbi->regs.lcdcon2);
 395         dprintk("lcdcon[3] = 0x%08lx\n", fbi->regs.lcdcon3);
 396         dprintk("lcdcon[4] = 0x%08lx\n", fbi->regs.lcdcon4);
 397         dprintk("lcdcon[5] = 0x%08lx\n", fbi->regs.lcdcon5);
 398
 399         writel(fbi->regs.lcdcon1 & ~S3C2410_LCDCON1_ENVID,
 400                 regs + S3C2410_LCDCON1);
 401         writel(fbi->regs.lcdcon2, regs + S3C2410_LCDCON2);
 402         writel(fbi->regs.lcdcon3, regs + S3C2410_LCDCON3);
 403         writel(fbi->regs.lcdcon4, regs + S3C2410_LCDCON4);
 404         writel(fbi->regs.lcdcon5, regs + S3C2410_LCDCON5);
 405
 406         /* set lcd address pointers */
 407         s3c2410fb_set_lcdaddr(info);
 408
 409         fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID,
 410         writel(fbi->regs.lcdcon1, regs + S3C2410_LCDCON1);
 411 }
 412
 413 /*
 414  *      s3c2410fb_set_par - Alters the hardware state.
 415  *      @info: frame buffer structure that represents a single frame buffer
 416  *
 417  */
 418 static int s3c2410fb_set_par(struct fb_info *info)
 419 {
 420         struct fb_var_screeninfo *var = &info->var;
 421
 422         switch (var->bits_per_pixel) {
 423         case 32:
 424         case 16:
 425         case 12:
 426                 info->fix.visual = FB_VISUAL_TRUECOLOR;
 427                 break;
 428         case 1:
 429                 info->fix.visual = FB_VISUAL_MONO01;
 430                 break;
 431         default:
 432                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
 433                 break;
 434         }
 435
 436         info->fix.line_length = (var->xres_virtual * var->bits_per_pixel) / 8;
 437
 438         /* activate this new configuration */
 439
 440         s3c2410fb_activate_var(info);
 441         return 0;
 442 }
 443
 444 static void schedule_palette_update(struct s3c2410fb_info *fbi,
 445                                     unsigned int regno, unsigned int val)
 446 {
 447         unsigned long flags;
 448         unsigned long irqen;
 449         void __iomem *irq_base = fbi->irq_base;
 450
 451         local_irq_save(flags);
 452
 453         fbi->palette_buffer[regno] = val;
 454
 455         if (!fbi->palette_ready) {
 456                 fbi->palette_ready = 1;
 457
 458                 /* enable IRQ */
 459                 irqen = readl(irq_base + S3C24XX_LCDINTMSK);
 460                 irqen &= ~S3C2410_LCDINT_FRSYNC;
 461                 writel(irqen, irq_base + S3C24XX_LCDINTMSK);
 462         }
 463
 464         local_irq_restore(flags);
 465 }
 466
 467 /* from pxafb.c */
 468 static inline unsigned int chan_to_field(unsigned int chan,
 469                                          struct fb_bitfield *bf)
 470 {
 471         chan &= 0xffff;
 472         chan >>= 16 - bf->length;
 473         return chan << bf->offset;
 474 }
 475
 476 static int s3c2410fb_setcolreg(unsigned regno,
 477                                unsigned red, unsigned green, unsigned blue,
 478                                unsigned transp, struct fb_info *info)
 479 {
 480         struct s3c2410fb_info *fbi = info->par;
 481         void __iomem *regs = fbi->io;
 482         unsigned int val;
 483
 484         /* dprintk("setcol: regno=%d, rgb=%d,%d,%d\n",
 485                    regno, red, green, blue); */
 486
 487         switch (info->fix.visual) {
 488         case FB_VISUAL_TRUECOLOR:
 489                 /* true-colour, use pseudo-palette */
 490
 491                 if (regno < 16) {
 492                         u32 *pal = info->pseudo_palette;
 493
 494                         val  = chan_to_field(red,   &info->var.red);
 495                         val |= chan_to_field(green, &info->var.green);
 496                         val |= chan_to_field(blue,  &info->var.blue);
 497
 498                         pal[regno] = val;
 499                 }
 500                 break;
 501
 502         case FB_VISUAL_PSEUDOCOLOR:
 503                 if (regno < 256) {
 504                         /* currently assume RGB 5-6-5 mode */
 505
 506                         val  = (red   >>  0) & 0xf800;
 507                         val |= (green >>  5) & 0x07e0;
 508                         val |= (blue  >> 11) & 0x001f;
 509
 510                         writel(val, regs + S3C2410_TFTPAL(regno));
 511                         schedule_palette_update(fbi, regno, val);
 512                 }
 513
 514                 break;
 515
 516         default:
 517                 return 1;       /* unknown type */
 518         }
 519
 520         return 0;
 521 }
 522
 523 /* s3c2410fb_lcd_enable
 524  *
 525  * shutdown the lcd controller
 526  */
 527 static void s3c2410fb_lcd_enable(struct s3c2410fb_info *fbi, int enable)
 528 {
 529         unsigned long flags;
 530
 531         local_irq_save(flags);
 532
 533         if (enable)
 534                 fbi->regs.lcdcon1 |= S3C2410_LCDCON1_ENVID;
 535         else
 536                 fbi->regs.lcdcon1 &= ~S3C2410_LCDCON1_ENVID;
 537
 538         writel(fbi->regs.lcdcon1, fbi->io + S3C2410_LCDCON1);
 539
 540         local_irq_restore(flags);
 541 }
 542
 543
 544 /*
 545  *      s3c2410fb_blank
 546  *      @blank_mode: the blank mode we want.
 547  *      @info: frame buffer structure that represents a single frame buffer
 548  *
 549  *      Blank the screen if blank_mode != 0, else unblank. Return 0 if
 550  *      blanking succeeded, != 0 if un-/blanking failed due to e.g. a
 551  *      video mode which doesn't support it. Implements VESA suspend
 552  *      and powerdown modes on hardware that supports disabling hsync/vsync:
 553  *
 554  *      Returns negative errno on error, or zero on success.
 555  *
 556  */
 557 static int s3c2410fb_blank(int blank_mode, struct fb_info *info)
 558 {
 559         struct s3c2410fb_info *fbi = info->par;
 560         void __iomem *tpal_reg = fbi->io;
 561
 562         dprintk("blank(mode=%d, info=%p)\n", blank_mode, info);
 563
 564         tpal_reg += is_s3c2412(fbi) ? S3C2412_TPAL : S3C2410_TPAL;
 565
 566         if (blank_mode == FB_BLANK_POWERDOWN) {
 567                 s3c2410fb_lcd_enable(fbi, 0);
 568         } else {
 569                 s3c2410fb_lcd_enable(fbi, 1);
 570         }
 571
 572         if (blank_mode == FB_BLANK_UNBLANK)
 573                 writel(0x0, tpal_reg);
 574         else {
 575                 dprintk("setting TPAL to output 0x000000\n");
 576                 writel(S3C2410_TPAL_EN, tpal_reg);
 577         }
 578
 579         return 0;
 580 }
 581
 582 static int s3c2410fb_debug_show(struct device *dev,
 583                                 struct device_attribute *attr, char *buf)
 584 {
 585         return snprintf(buf, PAGE_SIZE, "%s\n", debug ? "on" : "off");
 586 }
 587
 588 static int s3c2410fb_debug_store(struct device *dev,
 589                                  struct device_attribute *attr,
 590                                  const char *buf, size_t len)
 591 {
 592         if (len < 1)
 593                 return -EINVAL;
 594
 595         if (strnicmp(buf, "on", 2) == 0 ||
 596             strnicmp(buf, "1", 1) == 0) {
 597                 debug = 1;
 598                 printk(KERN_DEBUG "s3c2410fb: Debug On");
 599         } else if (strnicmp(buf, "off", 3) == 0 ||
 600                    strnicmp(buf, "0", 1) == 0) {
 601                 debug = 0;
 602                 printk(KERN_DEBUG "s3c2410fb: Debug Off");
 603         } else {
 604                 return -EINVAL;
 605         }
 606
 607         return len;
 608 }
 609
 610 static DEVICE_ATTR(debug, 0666, s3c2410fb_debug_show, s3c2410fb_debug_store);
 611
 612 static struct fb_ops s3c2410fb_ops = {
 613         .owner          = THIS_MODULE,
 614         .fb_check_var   = s3c2410fb_check_var,
 615         .fb_set_par     = s3c2410fb_set_par,
 616         .fb_blank       = s3c2410fb_blank,
 617         .fb_setcolreg   = s3c2410fb_setcolreg,
 618         .fb_fillrect    = cfb_fillrect,
 619         .fb_copyarea    = cfb_copyarea,
 620         .fb_imageblit   = cfb_imageblit,
 621 };
 622
 623 /*
 624  * s3c2410fb_map_video_memory():
 625  *      Allocates the DRAM memory for the frame buffer.  This buffer is
 626  *      remapped into a non-cached, non-buffered, memory region to
 627  *      allow palette and pixel writes to occur without flushing the
 628  *      cache.  Once this area is remapped, all virtual memory
 629  *      access to the video memory should occur at the new region.
 630  */
 631 static int __init s3c2410fb_map_video_memory(struct fb_info *info)
 632 {
 633         struct s3c2410fb_info *fbi = info->par;
 634         dma_addr_t map_dma;
 635         unsigned map_size = PAGE_ALIGN(info->fix.smem_len);
 636
 637         dprintk("map_video_memory(fbi=%p) map_size %u\n", fbi, map_size);
 638
 639         info->screen_base = dma_alloc_writecombine(fbi->dev, map_size,
 640                                                    &map_dma, GFP_KERNEL);
 641
 642         if (info->screen_base) {
 643                 /* prevent initial garbage on screen */
 644                 dprintk("map_video_memory: clear %p:%08x\n",
 645                         info->screen_base, map_size);
 646                 memset(info->screen_base, 0x00, map_size);
 647
 648                 info->fix.smem_start = map_dma;
 649
 650                 dprintk("map_video_memory: dma=%08lx cpu=%p size=%08x\n",
 651                         info->fix.smem_start, info->screen_base, map_size);
 652         }
 653
 654         return info->screen_base ? 0 : -ENOMEM;
 655 }
 656
 657 static inline void s3c2410fb_unmap_video_memory(struct fb_info *info)
 658 {
 659         struct s3c2410fb_info *fbi = info->par;
 660
 661         dma_free_writecombine(fbi->dev, PAGE_ALIGN(info->fix.smem_len),
 662                               info->screen_base, info->fix.smem_start);
 663 }
 664
 665 static inline void modify_gpio(void __iomem *reg,
 666                                unsigned long set, unsigned long mask)
 667 {
 668         unsigned long tmp;
 669
 670         tmp = readl(reg) & ~mask;
 671         writel(tmp | set, reg);
 672 }
 673
 674 /*
 675  * s3c2410fb_init_registers - Initialise all LCD-related registers
 676  */
 677 static int s3c2410fb_init_registers(struct fb_info *info)
 678 {
 679         struct s3c2410fb_info *fbi = info->par;
 680         struct s3c2410fb_mach_info *mach_info = fbi->dev->platform_data;
 681         unsigned long flags;
 682         void __iomem *regs = fbi->io;
 683         void __iomem *tpal;
 684         void __iomem *lpcsel;
 685
 686         if (is_s3c2412(fbi)) {
 687                 tpal = regs + S3C2412_TPAL;
 688                 lpcsel = regs + S3C2412_TCONSEL;
 689         } else {
 690                 tpal = regs + S3C2410_TPAL;
 691                 lpcsel = regs + S3C2410_LPCSEL;
 692         }
 693
 694         /* Initialise LCD with values from haret */
 695
 696         local_irq_save(flags);
 697
 698         /* modify the gpio(s) with interrupts set (bjd) */
 699
 700         modify_gpio(S3C2410_GPCUP,  mach_info->gpcup,  mach_info->gpcup_mask);
 701         modify_gpio(S3C2410_GPCCON, mach_info->gpccon, mach_info->gpccon_mask);
 702         modify_gpio(S3C2410_GPDUP,  mach_info->gpdup,  mach_info->gpdup_mask);
 703         modify_gpio(S3C2410_GPDCON, mach_info->gpdcon, mach_info->gpdcon_mask);
 704
 705         local_irq_restore(flags);
 706
 707         dprintk("LPCSEL    = 0x%08lx\n", mach_info->lpcsel);
 708         writel(mach_info->lpcsel, lpcsel);
 709
 710         dprintk("replacing TPAL %08x\n", readl(tpal));
 711
 712         /* ensure temporary palette disabled */
 713         writel(0x00, tpal);
 714
 715         return 0;
 716 }
 717
 718 static void s3c2410fb_write_palette(struct s3c2410fb_info *fbi)
 719 {
 720         unsigned int i;
 721         void __iomem *regs = fbi->io;
 722
 723         fbi->palette_ready = 0;
 724
 725         for (i = 0; i < 256; i++) {
 726                 unsigned long ent = fbi->palette_buffer[i];
 727                 if (ent == PALETTE_BUFF_CLEAR)
 728                         continue;
 729
 730                 writel(ent, regs + S3C2410_TFTPAL(i));
 731
 732                 /* it seems the only way to know exactly
 733                  * if the palette wrote ok, is to check
 734                  * to see if the value verifies ok
 735                  */
 736
 737                 if (readw(regs + S3C2410_TFTPAL(i)) == ent)
 738                         fbi->palette_buffer[i] = PALETTE_BUFF_CLEAR;
 739                 else
 740                         fbi->palette_ready = 1;   /* retry */
 741         }
 742 }
 743
 744 static irqreturn_t s3c2410fb_irq(int irq, void *dev_id)
 745 {
 746         struct s3c2410fb_info *fbi = dev_id;
 747         void __iomem *irq_base = fbi->irq_base;
 748         unsigned long lcdirq = readl(irq_base + S3C24XX_LCDINTPND);
 749
 750         if (lcdirq & S3C2410_LCDINT_FRSYNC) {
 751                 if (fbi->palette_ready)
 752                         s3c2410fb_write_palette(fbi);
 753
 754                 writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDINTPND);
 755                 writel(S3C2410_LCDINT_FRSYNC, irq_base + S3C24XX_LCDSRCPND);
 756         }
 757
 758         return IRQ_HANDLED;
 759 }
 760
 761 static char driver_name[] = "s3c2410fb";
 762
 763 static int __init s3c24xxfb_probe(struct platform_device *pdev,
 764                                   enum s3c_drv_type drv_type)
 765 {
 766         struct s3c2410fb_info *info;
 767         struct s3c2410fb_display *display;
 768         struct fb_info *fbinfo;
 769         struct s3c2410fb_mach_info *mach_info;
 770         struct resource *res;
 771         int ret;
 772         int irq;
 773         int i;
 774         int size;
 775         u32 lcdcon1;
 776
 777         mach_info = pdev->dev.platform_data;
 778         if (mach_info == NULL) {
 779                 dev_err(&pdev->dev,
 780                         "no platform data for lcd, cannot attach\n");
 781                 return -EINVAL;
 782         }
 783
 784         if (mach_info->default_display >= mach_info->num_displays) {
 785                 dev_err(&pdev->dev, "default is %d but only %d displays\n",
 786                         mach_info->default_display, mach_info->num_displays);
 787                 return -EINVAL;
 788         }
 789
 790         display = mach_info->displays + mach_info->default_display;
 791
 792         irq = platform_get_irq(pdev, 0);
 793         if (irq < 0) {
 794                 dev_err(&pdev->dev, "no irq for device\n");
 795                 return -ENOENT;
 796         }
 797
 798         fbinfo = framebuffer_alloc(sizeof(struct s3c2410fb_info), &pdev->dev);
 799         if (!fbinfo)
 800                 return -ENOMEM;
 801
 802         platform_set_drvdata(pdev, fbinfo);
 803
 804         info = fbinfo->par;
 805         info->dev = &pdev->dev;
 806         info->drv_type = drv_type;
 807
 808         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 809         if (res == NULL) {
 810                 dev_err(&pdev->dev, "failed to get memory registers\n");
 811                 ret = -ENXIO;
 812                 goto dealloc_fb;
 813         }
 814
 815         size = (res->end - res->start) + 1;
 816         info->mem = request_mem_region(res->start, size, pdev->name);
 817         if (info->mem == NULL) {
 818                 dev_err(&pdev->dev, "failed to get memory region\n");
 819                 ret = -ENOENT;
 820                 goto dealloc_fb;
 821         }
 822
 823         info->io = ioremap(res->start, size);
 824         if (info->io == NULL) {
 825                 dev_err(&pdev->dev, "ioremap() of registers failed\n");
 826                 ret = -ENXIO;
 827                 goto release_mem;
 828         }
 829
 830         info->irq_base = info->io + ((drv_type == DRV_S3C2412) ? S3C2412_LCDINTBASE : S3C2410_LCDINTBASE);
 831
 832         dprintk("devinit\n");
 833
 834         strcpy(fbinfo->fix.id, driver_name);
 835
 836         /* Stop the video */
 837         lcdcon1 = readl(info->io + S3C2410_LCDCON1);
 838         writel(lcdcon1 & ~S3C2410_LCDCON1_ENVID, info->io + S3C2410_LCDCON1);
 839
 840         fbinfo->fix.type            = FB_TYPE_PACKED_PIXELS;
 841         fbinfo->fix.type_aux        = 0;
 842         fbinfo->fix.xpanstep        = 0;
 843         fbinfo->fix.ypanstep        = 0;
 844         fbinfo->fix.ywrapstep       = 0;
 845         fbinfo->fix.accel           = FB_ACCEL_NONE;
 846
 847         fbinfo->var.nonstd          = 0;
 848         fbinfo->var.activate        = FB_ACTIVATE_NOW;
 849         fbinfo->var.accel_flags     = 0;
 850         fbinfo->var.vmode           = FB_VMODE_NONINTERLACED;
 851
 852         fbinfo->fbops               = &s3c2410fb_ops;
 853         fbinfo->flags               = FBINFO_FLAG_DEFAULT;
 854         fbinfo->pseudo_palette      = &info->pseudo_pal;
 855
 856         for (i = 0; i < 256; i++)
 857                 info->palette_buffer[i] = PALETTE_BUFF_CLEAR;
 858
 859         ret = request_irq(irq, s3c2410fb_irq, IRQF_DISABLED, pdev->name, info);
 860         if (ret) {
 861                 dev_err(&pdev->dev, "cannot get irq %d - err %d\n", irq, ret);
 862                 ret = -EBUSY;
 863                 goto release_regs;
 864         }
 865
 866         info->clk = clk_get(NULL, "lcd");
 867         if (!info->clk || IS_ERR(info->clk)) {
 868                 printk(KERN_ERR "failed to get lcd clock source\n");
 869                 ret = -ENOENT;
 870                 goto release_irq;
 871         }
 872
 873         clk_enable(info->clk);
 874         dprintk("got and enabled clock\n");
 875
 876         msleep(1);
 877
 878         /* find maximum required memory size for display */
 879         for (i = 0; i < mach_info->num_displays; i++) {
 880                 unsigned long smem_len = mach_info->displays[i].xres;
 881
 882                 smem_len *= mach_info->displays[i].yres;
 883                 smem_len *= mach_info->displays[i].bpp;
 884                 smem_len >>= 3;
 885                 if (fbinfo->fix.smem_len < smem_len)
 886                         fbinfo->fix.smem_len = smem_len;
 887         }
 888
 889         /* Initialize video memory */
 890         ret = s3c2410fb_map_video_memory(fbinfo);
 891         if (ret) {
 892                 printk(KERN_ERR "Failed to allocate video RAM: %d\n", ret);
 893                 ret = -ENOMEM;
 894                 goto release_clock;
 895         }
 896
 897         dprintk("got video memory\n");
 898
 899         fbinfo->var.xres = display->xres;
 900         fbinfo->var.yres = display->yres;
 901         fbinfo->var.bits_per_pixel = display->bpp;
 902
 903         s3c2410fb_init_registers(fbinfo);
 904
 905         s3c2410fb_check_var(&fbinfo->var, fbinfo);
 906
 907         ret = register_framebuffer(fbinfo);
 908         if (ret < 0) {
 909                 printk(KERN_ERR "Failed to register framebuffer device: %d\n",
 910                         ret);
 911                 goto free_video_memory;
 912         }
 913
 914         /* create device files */
 915         ret = device_create_file(&pdev->dev, &dev_attr_debug);
 916         if (ret) {
 917                 printk(KERN_ERR "failed to add debug attribute\n");
 918         }
 919
 920         printk(KERN_INFO "fb%d: %s frame buffer device\n",
 921                 fbinfo->node, fbinfo->fix.id);
 922
 923         return 0;
 924
 925 free_video_memory:
 926         s3c2410fb_unmap_video_memory(fbinfo);
 927 release_clock:
 928         clk_disable(info->clk);
 929         clk_put(info->clk);
 930 release_irq:
 931         free_irq(irq, info);
 932 release_regs:
 933         iounmap(info->io);
 934 release_mem:
 935         release_resource(info->mem);
 936         kfree(info->mem);
 937 dealloc_fb:
 938         platform_set_drvdata(pdev, NULL);
 939         framebuffer_release(fbinfo);
 940         return ret;
 941 }
 942
 943 static int __init s3c2410fb_probe(struct platform_device *pdev)
 944 {
 945         return s3c24xxfb_probe(pdev, DRV_S3C2410);
 946 }
 947
 948 static int __init s3c2412fb_probe(struct platform_device *pdev)
 949 {
 950         return s3c24xxfb_probe(pdev, DRV_S3C2412);
 951 }
 952
 953
 954 /*
 955  *  Cleanup
 956  */
 957 static int s3c2410fb_remove(struct platform_device *pdev)
 958 {
 959         struct fb_info *fbinfo = platform_get_drvdata(pdev);
 960         struct s3c2410fb_info *info = fbinfo->par;
 961         int irq;
 962
 963         unregister_framebuffer(fbinfo);
 964
 965         s3c2410fb_lcd_enable(info, 0);
 966         msleep(1);
 967
 968         s3c2410fb_unmap_video_memory(fbinfo);
 969
 970         if (info->clk) {
 971                 clk_disable(info->clk);
 972                 clk_put(info->clk);
 973                 info->clk = NULL;
 974         }
 975
 976         irq = platform_get_irq(pdev, 0);
 977         free_irq(irq, info);
 978
 979         iounmap(info->io);
 980
 981         release_resource(info->mem);
 982         kfree(info->mem);
 983
 984         platform_set_drvdata(pdev, NULL);
 985         framebuffer_release(fbinfo);
 986
 987         return 0;
 988 }
 989
 990 #ifdef CONFIG_PM
 991
 992 /* suspend and resume support for the lcd controller */
 993 static int s3c2410fb_suspend(struct platform_device *dev, pm_message_t state)
 994 {
 995         struct fb_info     *fbinfo = platform_get_drvdata(dev);
 996         struct s3c2410fb_info *info = fbinfo->par;
 997
 998         s3c2410fb_lcd_enable(info, 0);
 999
1000         /* sleep before disabling the clock, we need to ensure
1001          * the LCD DMA engine is not going to get back on the bus
1002          * before the clock goes off again (bjd) */
1003
1004         msleep(1);
1005         clk_disable(info->clk);
1006
1007         return 0;
1008 }
1009
1010 static int s3c2410fb_resume(struct platform_device *dev)
1011 {
1012         struct fb_info     *fbinfo = platform_get_drvdata(dev);
1013         struct s3c2410fb_info *info = fbinfo->par;
1014
1015         clk_enable(info->clk);
1016         msleep(1);
1017
1018         s3c2410fb_init_registers(fbinfo);
1019
1020         return 0;
1021 }
1022
1023 #else
1024 #define s3c2410fb_suspend NULL
1025 #define s3c2410fb_resume  NULL
1026 #endif
1027
1028 static struct platform_driver s3c2410fb_driver = {
1029         .probe          = s3c2410fb_probe,
1030         .remove         = s3c2410fb_remove,
1031         .suspend        = s3c2410fb_suspend,
1032         .resume         = s3c2410fb_resume,
1033         .driver         = {
1034                 .name   = "s3c2410-lcd",
1035                 .owner  = THIS_MODULE,
1036         },
1037 };
1038
1039 static struct platform_driver s3c2412fb_driver = {
1040         .probe          = s3c2412fb_probe,
1041         .remove         = s3c2410fb_remove,
1042         .suspend        = s3c2410fb_suspend,
1043         .resume         = s3c2410fb_resume,
1044         .driver         = {
1045                 .name   = "s3c2412-lcd",
1046                 .owner  = THIS_MODULE,
1047         },
1048 };
1049
1050 int __init s3c2410fb_init(void)
1051 {
1052         int ret = platform_driver_register(&s3c2410fb_driver);
1053
1054         if (ret == 0)
1055                 ret = platform_driver_register(&s3c2412fb_driver);;
1056
1057         return ret;
1058 }
1059
1060 static void __exit s3c2410fb_cleanup(void)
1061 {
1062         platform_driver_unregister(&s3c2410fb_driver);
1063         platform_driver_unregister(&s3c2412fb_driver);
1064 }
1065
1066 module_init(s3c2410fb_init);
1067 module_exit(s3c2410fb_cleanup);
1068
1069 MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>, "
1070               "Ben Dooks <ben-linux@fluff.org>");
1071 MODULE_DESCRIPTION("Framebuffer driver for the s3c2410");
1072 MODULE_LICENSE("GPL");
1073 MODULE_ALIAS("platform:s3c2410-lcd");
1074 MODULE_ALIAS("platform:s3c2412-lcd");