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   1 /*
   2  *  linux/drivers/video/amba-clcd.c
   3  *
   4  * Copyright (C) 2001 ARM Limited, by David A Rusling
   5  * Updated to 2.5, Deep Blue Solutions Ltd.
   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
   9  * for more details.
  10  *
  11  *  ARM PrimeCell PL110 Color LCD Controller
  12  */
  13 #include <linux/module.h>
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/string.h>
  17 #include <linux/slab.h>
  18 #include <linux/delay.h>
  19 #include <linux/mm.h>
  20 #include <linux/fb.h>
  21 #include <linux/init.h>
  22 #include <linux/ioport.h>
  23 #include <linux/list.h>
  24
  25 #include <asm/hardware/amba.h>
  26 #include <asm/hardware/clock.h>
  27
  28 #include <asm/hardware/amba_clcd.h>
  29
  30 #define to_clcd(info)   container_of(info, struct clcd_fb, fb)
  31
  32 /* This is limited to 16 characters when displayed by X startup */
  33 static const char *clcd_name = "CLCD FB";
  34
  35 /*
  36  * Unfortunately, the enable/disable functions may be called either from
  37  * process or IRQ context, and we _need_ to delay.  This is _not_ good.
  38  */
  39 static inline void clcdfb_sleep(unsigned int ms)
  40 {
  41         if (in_atomic()) {
  42                 mdelay(ms);
  43         } else {
  44                 msleep(ms);
  45         }
  46 }
  47
  48 static inline void clcdfb_set_start(struct clcd_fb *fb)
  49 {
  50         unsigned long ustart = fb->fb.fix.smem_start;
  51         unsigned long lstart;
  52
  53         ustart += fb->fb.var.yoffset * fb->fb.fix.line_length;
  54         lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2;
  55
  56         writel(ustart, fb->regs + CLCD_UBAS);
  57         writel(lstart, fb->regs + CLCD_LBAS);
  58 }
  59
  60 static void clcdfb_disable(struct clcd_fb *fb)
  61 {
  62         u32 val;
  63
  64         if (fb->board->disable)
  65                 fb->board->disable(fb);
  66
  67         val = readl(fb->regs + CLCD_CNTL);
  68         if (val & CNTL_LCDPWR) {
  69                 val &= ~CNTL_LCDPWR;
  70                 writel(val, fb->regs + CLCD_CNTL);
  71
  72                 clcdfb_sleep(20);
  73         }
  74         if (val & CNTL_LCDEN) {
  75                 val &= ~CNTL_LCDEN;
  76                 writel(val, fb->regs + CLCD_CNTL);
  77         }
  78
  79         /*
  80          * Disable CLCD clock source.
  81          */
  82         clk_disable(fb->clk);
  83 }
  84
  85 static void clcdfb_enable(struct clcd_fb *fb, u32 cntl)
  86 {
  87         /*
  88          * Enable the CLCD clock source.
  89          */
  90         clk_enable(fb->clk);
  91
  92         /*
  93          * Bring up by first enabling..
  94          */
  95         cntl |= CNTL_LCDEN;
  96         writel(cntl, fb->regs + CLCD_CNTL);
  97
  98         clcdfb_sleep(20);
  99
 100         /*
 101          * and now apply power.
 102          */
 103         cntl |= CNTL_LCDPWR;
 104         writel(cntl, fb->regs + CLCD_CNTL);
 105
 106         /*
 107          * finally, enable the interface.
 108          */
 109         if (fb->board->enable)
 110                 fb->board->enable(fb);
 111 }
 112
 113 static int
 114 clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var)
 115 {
 116         int ret = 0;
 117
 118         memset(&var->transp, 0, sizeof(var->transp));
 119         memset(&var->red, 0, sizeof(var->red));
 120         memset(&var->green, 0, sizeof(var->green));
 121         memset(&var->blue, 0, sizeof(var->blue));
 122
 123         switch (var->bits_per_pixel) {
 124         case 1:
 125         case 2:
 126         case 4:
 127         case 8:
 128                 var->red.length         = var->bits_per_pixel;
 129                 var->red.offset         = 0;
 130                 var->green.length       = var->bits_per_pixel;
 131                 var->green.offset       = 0;
 132                 var->blue.length        = var->bits_per_pixel;
 133                 var->blue.offset        = 0;
 134                 break;
 135         case 16:
 136                 var->red.length         = 5;
 137                 var->green.length       = 6;
 138                 var->blue.length        = 5;
 139                 if (fb->panel->cntl & CNTL_BGR) {
 140                         var->red.offset         = 11;
 141                         var->green.offset       = 5;
 142                         var->blue.offset        = 0;
 143                 } else {
 144                         var->red.offset         = 0;
 145                         var->green.offset       = 5;
 146                         var->blue.offset        = 11;
 147                 }
 148                 break;
 149         case 32:
 150                 if (fb->panel->cntl & CNTL_LCDTFT) {
 151                         var->red.length         = 8;
 152                         var->green.length       = 8;
 153                         var->blue.length        = 8;
 154
 155                         if (fb->panel->cntl & CNTL_BGR) {
 156                                 var->red.offset         = 16;
 157                                 var->green.offset       = 8;
 158                                 var->blue.offset        = 0;
 159                         } else {
 160                                 var->red.offset         = 0;
 161                                 var->green.offset       = 8;
 162                                 var->blue.offset        = 16;
 163                         }
 164                         break;
 165                 }
 166         default:
 167                 ret = -EINVAL;
 168                 break;
 169         }
 170
 171         return ret;
 172 }
 173
 174 static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 175 {
 176         struct clcd_fb *fb = to_clcd(info);
 177         int ret = -EINVAL;
 178
 179         if (fb->board->check)
 180                 ret = fb->board->check(fb, var);
 181
 182         if (ret == 0 &&
 183             var->xres_virtual * var->bits_per_pixel / 8 *
 184             var->yres_virtual > fb->fb.fix.smem_len)
 185                 ret = -EINVAL;
 186
 187         if (ret == 0)
 188                 ret = clcdfb_set_bitfields(fb, var);
 189
 190         return ret;
 191 }
 192
 193 static int clcdfb_set_par(struct fb_info *info)
 194 {
 195         struct clcd_fb *fb = to_clcd(info);
 196         struct clcd_regs regs;
 197
 198         fb->fb.fix.line_length = fb->fb.var.xres_virtual *
 199                                  fb->fb.var.bits_per_pixel / 8;
 200
 201         if (fb->fb.var.bits_per_pixel <= 8)
 202                 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
 203         else
 204                 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
 205
 206         fb->board->decode(fb, &regs);
 207
 208         clcdfb_disable(fb);
 209
 210         writel(regs.tim0, fb->regs + CLCD_TIM0);
 211         writel(regs.tim1, fb->regs + CLCD_TIM1);
 212         writel(regs.tim2, fb->regs + CLCD_TIM2);
 213         writel(regs.tim3, fb->regs + CLCD_TIM3);
 214
 215         clcdfb_set_start(fb);
 216
 217         clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
 218
 219         fb->clcd_cntl = regs.cntl;
 220
 221         clcdfb_enable(fb, regs.cntl);
 222
 223 #ifdef DEBUG
 224         printk(KERN_INFO "CLCD: Registers set to\n"
 225                KERN_INFO "  %08x %08x %08x %08x\n"
 226                KERN_INFO "  %08x %08x %08x %08x\n",
 227                 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
 228                 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
 229                 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
 230                 readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
 231 #endif
 232
 233         return 0;
 234 }
 235
 236 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
 237 {
 238         unsigned int mask = (1 << bf->length) - 1;
 239
 240         return (val >> (16 - bf->length) & mask) << bf->offset;
 241 }
 242
 243 /*
 244  *  Set a single color register. The values supplied have a 16 bit
 245  *  magnitude.  Return != 0 for invalid regno.
 246  */
 247 static int
 248 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
 249                  unsigned int blue, unsigned int transp, struct fb_info *info)
 250 {
 251         struct clcd_fb *fb = to_clcd(info);
 252
 253         if (regno < 16)
 254                 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
 255                                   convert_bitfield(blue, &fb->fb.var.blue) |
 256                                   convert_bitfield(green, &fb->fb.var.green) |
 257                                   convert_bitfield(red, &fb->fb.var.red);
 258
 259         if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) {
 260                 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
 261                 u32 val, mask, newval;
 262
 263                 newval  = (red >> 11)  & 0x001f;
 264                 newval |= (green >> 6) & 0x03e0;
 265                 newval |= (blue >> 1)  & 0x7c00;
 266
 267                 /*
 268                  * 3.2.11: if we're configured for big endian
 269                  * byte order, the palette entries are swapped.
 270                  */
 271                 if (fb->clcd_cntl & CNTL_BEBO)
 272                         regno ^= 1;
 273
 274                 if (regno & 1) {
 275                         newval <<= 16;
 276                         mask = 0x0000ffff;
 277                 } else {
 278                         mask = 0xffff0000;
 279                 }
 280
 281                 val = readl(fb->regs + hw_reg) & mask;
 282                 writel(val | newval, fb->regs + hw_reg);
 283         }
 284
 285         return regno > 255;
 286 }
 287
 288 /*
 289  *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
 290  *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 291  *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 292  *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 293  *  and powerdown modes on hardware that supports disabling hsync/vsync:
 294  *    blank_mode == 2: suspend vsync
 295  *    blank_mode == 3: suspend hsync
 296  *    blank_mode == 4: powerdown
 297  */
 298 static int clcdfb_blank(int blank_mode, struct fb_info *info)
 299 {
 300         struct clcd_fb *fb = to_clcd(info);
 301
 302         if (blank_mode != 0) {
 303                 clcdfb_disable(fb);
 304         } else {
 305                 clcdfb_enable(fb, fb->clcd_cntl);
 306         }
 307         return 0;
 308 }
 309
 310 static int clcdfb_mmap(struct fb_info *info, struct file *file,
 311                        struct vm_area_struct *vma)
 312 {
 313         struct clcd_fb *fb = to_clcd(info);
 314         unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
 315         int ret = -EINVAL;
 316
 317         len = info->fix.smem_len;
 318
 319         if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
 320             fb->board->mmap)
 321                 ret = fb->board->mmap(fb, vma);
 322
 323         return ret;
 324 }
 325
 326 static struct fb_ops clcdfb_ops = {
 327         .owner          = THIS_MODULE,
 328         .fb_check_var   = clcdfb_check_var,
 329         .fb_set_par     = clcdfb_set_par,
 330         .fb_setcolreg   = clcdfb_setcolreg,
 331         .fb_blank       = clcdfb_blank,
 332         .fb_fillrect    = cfb_fillrect,
 333         .fb_copyarea    = cfb_copyarea,
 334         .fb_imageblit   = cfb_imageblit,
 335         .fb_cursor      = soft_cursor,
 336         .fb_mmap        = clcdfb_mmap,
 337 };
 338
 339 static int clcdfb_register(struct clcd_fb *fb)
 340 {
 341         int ret;
 342
 343         fb->clk = clk_get(&fb->dev->dev, "CLCDCLK");
 344         if (IS_ERR(fb->clk)) {
 345                 ret = PTR_ERR(fb->clk);
 346                 goto out;
 347         }
 348
 349         ret = clk_use(fb->clk);
 350         if (ret)
 351                 goto free_clk;
 352
 353         fb->fb.fix.mmio_start   = fb->dev->res.start;
 354         fb->fb.fix.mmio_len     = SZ_4K;
 355
 356         fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
 357         if (!fb->regs) {
 358                 printk(KERN_ERR "CLCD: unable to remap registers\n");
 359                 ret = -ENOMEM;
 360                 goto unuse_clk;
 361         }
 362
 363         fb->fb.fbops            = &clcdfb_ops;
 364         fb->fb.flags            = FBINFO_FLAG_DEFAULT;
 365         fb->fb.pseudo_palette   = fb->cmap;
 366
 367         strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
 368         fb->fb.fix.type         = FB_TYPE_PACKED_PIXELS;
 369         fb->fb.fix.type_aux     = 0;
 370         fb->fb.fix.xpanstep     = 0;
 371         fb->fb.fix.ypanstep     = 0;
 372         fb->fb.fix.ywrapstep    = 0;
 373         fb->fb.fix.accel        = FB_ACCEL_NONE;
 374
 375         fb->fb.var.xres         = fb->panel->mode.xres;
 376         fb->fb.var.yres         = fb->panel->mode.yres;
 377         fb->fb.var.xres_virtual = fb->panel->mode.xres;
 378         fb->fb.var.yres_virtual = fb->panel->mode.yres;
 379         fb->fb.var.bits_per_pixel = fb->panel->bpp;
 380         fb->fb.var.grayscale    = fb->panel->grayscale;
 381         fb->fb.var.pixclock     = fb->panel->mode.pixclock;
 382         fb->fb.var.left_margin  = fb->panel->mode.left_margin;
 383         fb->fb.var.right_margin = fb->panel->mode.right_margin;
 384         fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
 385         fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
 386         fb->fb.var.hsync_len    = fb->panel->mode.hsync_len;
 387         fb->fb.var.vsync_len    = fb->panel->mode.vsync_len;
 388         fb->fb.var.sync         = fb->panel->mode.sync;
 389         fb->fb.var.vmode        = fb->panel->mode.vmode;
 390         fb->fb.var.activate     = FB_ACTIVATE_NOW;
 391         fb->fb.var.nonstd       = 0;
 392         fb->fb.var.height       = fb->panel->height;
 393         fb->fb.var.width        = fb->panel->width;
 394         fb->fb.var.accel_flags  = 0;
 395
 396         fb->fb.monspecs.hfmin   = 0;
 397         fb->fb.monspecs.hfmax   = 100000;
 398         fb->fb.monspecs.vfmin   = 0;
 399         fb->fb.monspecs.vfmax   = 400;
 400         fb->fb.monspecs.dclkmin = 1000000;
 401         fb->fb.monspecs.dclkmax = 100000000;
 402
 403         /*
 404          * Make sure that the bitfields are set appropriately.
 405          */
 406         clcdfb_set_bitfields(fb, &fb->fb.var);
 407
 408         /*
 409          * Allocate colourmap.
 410          */
 411         fb_alloc_cmap(&fb->fb.cmap, 256, 0);
 412
 413         /*
 414          * Ensure interrupts are disabled.
 415          */
 416         writel(0, fb->regs + CLCD_IENB);
 417
 418         fb_set_var(&fb->fb, &fb->fb.var);
 419
 420         printk(KERN_INFO "CLCD: %s hardware, %s display\n",
 421                fb->board->name, fb->panel->mode.name);
 422
 423         ret = register_framebuffer(&fb->fb);
 424         if (ret == 0)
 425                 goto out;
 426
 427         printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
 428
 429         iounmap(fb->regs);
 430  unuse_clk:
 431         clk_unuse(fb->clk);
 432  free_clk:
 433         clk_put(fb->clk);
 434  out:
 435         return ret;
 436 }
 437
 438 static int clcdfb_probe(struct amba_device *dev, void *id)
 439 {
 440         struct clcd_board *board = dev->dev.platform_data;
 441         struct clcd_fb *fb;
 442         int ret;
 443
 444         if (!board)
 445                 return -EINVAL;
 446
 447         ret = amba_request_regions(dev, NULL);
 448         if (ret) {
 449                 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
 450                 goto out;
 451         }
 452
 453         fb = (struct clcd_fb *) kmalloc(sizeof(struct clcd_fb), GFP_KERNEL);
 454         if (!fb) {
 455                 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
 456                 ret = -ENOMEM;
 457                 goto free_region;
 458         }
 459         memset(fb, 0, sizeof(struct clcd_fb));
 460
 461         fb->dev = dev;
 462         fb->board = board;
 463
 464         ret = fb->board->setup(fb);
 465         if (ret)
 466                 goto free_fb;
 467
 468         ret = clcdfb_register(fb);
 469         if (ret == 0) {
 470                 amba_set_drvdata(dev, fb);
 471                 goto out;
 472         }
 473
 474         fb->board->remove(fb);
 475  free_fb:
 476         kfree(fb);
 477  free_region:
 478         amba_release_regions(dev);
 479  out:
 480         return ret;
 481 }
 482
 483 static int clcdfb_remove(struct amba_device *dev)
 484 {
 485         struct clcd_fb *fb = amba_get_drvdata(dev);
 486
 487         amba_set_drvdata(dev, NULL);
 488
 489         clcdfb_disable(fb);
 490         unregister_framebuffer(&fb->fb);
 491         iounmap(fb->regs);
 492         clk_unuse(fb->clk);
 493         clk_put(fb->clk);
 494
 495         fb->board->remove(fb);
 496
 497         kfree(fb);
 498
 499         amba_release_regions(dev);
 500
 501         return 0;
 502 }
 503
 504 static struct amba_id clcdfb_id_table[] = {
 505         {
 506                 .id     = 0x00041110,
 507                 .mask   = 0x000fffff,
 508         },
 509         { 0, 0 },
 510 };
 511
 512 static struct amba_driver clcd_driver = {
 513         .drv            = {
 514                 .name   = "clcd-pl110",
 515         },
 516         .probe          = clcdfb_probe,
 517         .remove         = clcdfb_remove,
 518         .id_table       = clcdfb_id_table,
 519 };
 520
 521 int __init amba_clcdfb_init(void)
 522 {
 523         if (fb_get_options("ambafb", NULL))
 524                 return -ENODEV;
 525
 526         return amba_driver_register(&clcd_driver);
 527 }
 528
 529 module_init(amba_clcdfb_init);
 530
 531 static void __exit amba_clcdfb_exit(void)
 532 {
 533         amba_driver_unregister(&clcd_driver);
 534 }
 535
 536 module_exit(amba_clcdfb_exit);
 537
 538 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
 539 MODULE_LICENSE("GPL");