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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         = 8;
 129                 var->red.offset         = 0;
 130                 var->green.length       = 8;
 131                 var->green.offset       = 0;
 132                 var->blue.length        = 8;
 133                 var->blue.offset        = 0;
 134                 break;
 135         case 16:
 136                 var->red.length         = 5;
 137                 var->green.length       = 5;
 138                 var->blue.length        = 5;
 139                 if (fb->panel->cntl & CNTL_BGR) {
 140                         var->red.offset         = 10;
 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        = 10;
 147                 }
 148                 break;
 149         case 24:
 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         if (ret == 0)
 182                 ret = clcdfb_set_bitfields(fb, var);
 183
 184         return ret;
 185 }
 186
 187 static int clcdfb_set_par(struct fb_info *info)
 188 {
 189         struct clcd_fb *fb = to_clcd(info);
 190         struct clcd_regs regs;
 191
 192         fb->fb.fix.line_length = fb->fb.var.xres_virtual *
 193                                  fb->fb.var.bits_per_pixel / 8;
 194
 195         if (fb->fb.var.bits_per_pixel <= 8)
 196                 fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
 197         else
 198                 fb->fb.fix.visual = FB_VISUAL_TRUECOLOR;
 199
 200         fb->board->decode(fb, &regs);
 201
 202         clcdfb_disable(fb);
 203
 204         writel(regs.tim0, fb->regs + CLCD_TIM0);
 205         writel(regs.tim1, fb->regs + CLCD_TIM1);
 206         writel(regs.tim2, fb->regs + CLCD_TIM2);
 207         writel(regs.tim3, fb->regs + CLCD_TIM3);
 208
 209         clcdfb_set_start(fb);
 210
 211         clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000);
 212
 213         fb->clcd_cntl = regs.cntl;
 214
 215         clcdfb_enable(fb, regs.cntl);
 216
 217 #ifdef DEBUG
 218         printk(KERN_INFO "CLCD: Registers set to\n"
 219                KERN_INFO "  %08x %08x %08x %08x\n"
 220                KERN_INFO "  %08x %08x %08x %08x\n",
 221                 readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1),
 222                 readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3),
 223                 readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS),
 224                 readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL));
 225 #endif
 226
 227         return 0;
 228 }
 229
 230 static inline u32 convert_bitfield(int val, struct fb_bitfield *bf)
 231 {
 232         unsigned int mask = (1 << bf->length) - 1;
 233
 234         return (val >> (16 - bf->length) & mask) << bf->offset;
 235 }
 236
 237 /*
 238  *  Set a single color register. The values supplied have a 16 bit
 239  *  magnitude.  Return != 0 for invalid regno.
 240  */
 241 static int
 242 clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green,
 243                  unsigned int blue, unsigned int transp, struct fb_info *info)
 244 {
 245         struct clcd_fb *fb = to_clcd(info);
 246
 247         if (regno < 16)
 248                 fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) |
 249                                   convert_bitfield(blue, &fb->fb.var.blue) |
 250                                   convert_bitfield(green, &fb->fb.var.green) |
 251                                   convert_bitfield(red, &fb->fb.var.red);
 252
 253         if (fb->fb.var.bits_per_pixel == 8 && regno < 256) {
 254                 int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3);
 255                 u32 val, mask, newval;
 256
 257                 newval  = (red >> 11)  & 0x001f;
 258                 newval |= (green >> 6) & 0x03e0;
 259                 newval |= (blue >> 1)  & 0x7c00;
 260
 261                 /*
 262                  * 3.2.11: if we're configured for big endian
 263                  * byte order, the palette entries are swapped.
 264                  */
 265                 if (fb->clcd_cntl & CNTL_BEBO)
 266                         regno ^= 1;
 267
 268                 if (regno & 1) {
 269                         newval <<= 16;
 270                         mask = 0x0000ffff;
 271                 } else {
 272                         mask = 0xffff0000;
 273                 }
 274
 275                 val = readl(fb->regs + hw_reg) & mask;
 276                 writel(val | newval, fb->regs + hw_reg);
 277         }
 278
 279         return regno > 255;
 280 }
 281
 282 /*
 283  *  Blank the screen if blank_mode != 0, else unblank. If blank == NULL
 284  *  then the caller blanks by setting the CLUT (Color Look Up Table) to all
 285  *  black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due
 286  *  to e.g. a video mode which doesn't support it. Implements VESA suspend
 287  *  and powerdown modes on hardware that supports disabling hsync/vsync:
 288  *    blank_mode == 2: suspend vsync
 289  *    blank_mode == 3: suspend hsync
 290  *    blank_mode == 4: powerdown
 291  */
 292 static int clcdfb_blank(int blank_mode, struct fb_info *info)
 293 {
 294         struct clcd_fb *fb = to_clcd(info);
 295
 296         if (blank_mode != 0) {
 297                 clcdfb_disable(fb);
 298         } else {
 299                 clcdfb_enable(fb, fb->clcd_cntl);
 300         }
 301         return 0;
 302 }
 303
 304 static int clcdfb_mmap(struct fb_info *info, struct file *file,
 305                        struct vm_area_struct *vma)
 306 {
 307         struct clcd_fb *fb = to_clcd(info);
 308         unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT;
 309         int ret = -EINVAL;
 310
 311         len = info->fix.smem_len;
 312
 313         if (off <= len && vma->vm_end - vma->vm_start <= len - off &&
 314             fb->board->mmap)
 315                 ret = fb->board->mmap(fb, vma);
 316
 317         return ret;
 318 }
 319
 320 static struct fb_ops clcdfb_ops = {
 321         .owner          = THIS_MODULE,
 322         .fb_check_var   = clcdfb_check_var,
 323         .fb_set_par     = clcdfb_set_par,
 324         .fb_setcolreg   = clcdfb_setcolreg,
 325         .fb_blank       = clcdfb_blank,
 326         .fb_fillrect    = cfb_fillrect,
 327         .fb_copyarea    = cfb_copyarea,
 328         .fb_imageblit   = cfb_imageblit,
 329         .fb_cursor      = soft_cursor,
 330         .fb_mmap        = clcdfb_mmap,
 331 };
 332
 333 static int clcdfb_register(struct clcd_fb *fb)
 334 {
 335         int ret;
 336
 337         fb->clk = clk_get(&fb->dev->dev, "CLCDCLK");
 338         if (IS_ERR(fb->clk)) {
 339                 ret = PTR_ERR(fb->clk);
 340                 goto out;
 341         }
 342
 343         ret = clk_use(fb->clk);
 344         if (ret)
 345                 goto free_clk;
 346
 347         fb->fb.fix.mmio_start   = fb->dev->res.start;
 348         fb->fb.fix.mmio_len     = SZ_4K;
 349
 350         fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len);
 351         if (!fb->regs) {
 352                 printk(KERN_ERR "CLCD: unable to remap registers\n");
 353                 ret = -ENOMEM;
 354                 goto unuse_clk;
 355         }
 356
 357         fb->fb.fbops            = &clcdfb_ops;
 358         fb->fb.flags            = FBINFO_FLAG_DEFAULT;
 359         fb->fb.pseudo_palette   = fb->cmap;
 360
 361         strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id));
 362         fb->fb.fix.type         = FB_TYPE_PACKED_PIXELS;
 363         fb->fb.fix.type_aux     = 0;
 364         fb->fb.fix.xpanstep     = 0;
 365         fb->fb.fix.ypanstep     = 0;
 366         fb->fb.fix.ywrapstep    = 0;
 367         fb->fb.fix.accel        = FB_ACCEL_NONE;
 368
 369         fb->fb.var.xres         = fb->panel->mode.xres;
 370         fb->fb.var.yres         = fb->panel->mode.yres;
 371         fb->fb.var.xres_virtual = fb->panel->mode.xres;
 372         fb->fb.var.yres_virtual = fb->panel->mode.yres;
 373         fb->fb.var.bits_per_pixel = fb->panel->bpp;
 374         fb->fb.var.grayscale    = fb->panel->grayscale;
 375         fb->fb.var.pixclock     = fb->panel->mode.pixclock;
 376         fb->fb.var.left_margin  = fb->panel->mode.left_margin;
 377         fb->fb.var.right_margin = fb->panel->mode.right_margin;
 378         fb->fb.var.upper_margin = fb->panel->mode.upper_margin;
 379         fb->fb.var.lower_margin = fb->panel->mode.lower_margin;
 380         fb->fb.var.hsync_len    = fb->panel->mode.hsync_len;
 381         fb->fb.var.vsync_len    = fb->panel->mode.vsync_len;
 382         fb->fb.var.sync         = fb->panel->mode.sync;
 383         fb->fb.var.vmode        = fb->panel->mode.vmode;
 384         fb->fb.var.activate     = FB_ACTIVATE_NOW;
 385         fb->fb.var.nonstd       = 0;
 386         fb->fb.var.height       = fb->panel->height;
 387         fb->fb.var.width        = fb->panel->width;
 388         fb->fb.var.accel_flags  = 0;
 389
 390         fb->fb.monspecs.hfmin   = 0;
 391         fb->fb.monspecs.hfmax   = 100000;
 392         fb->fb.monspecs.vfmin   = 0;
 393         fb->fb.monspecs.vfmax   = 400;
 394         fb->fb.monspecs.dclkmin = 1000000;
 395         fb->fb.monspecs.dclkmax = 100000000;
 396
 397         /*
 398          * Make sure that the bitfields are set appropriately.
 399          */
 400         clcdfb_set_bitfields(fb, &fb->fb.var);
 401
 402         /*
 403          * Allocate colourmap.
 404          */
 405         fb_alloc_cmap(&fb->fb.cmap, 256, 0);
 406
 407         /*
 408          * Ensure interrupts are disabled.
 409          */
 410         writel(0, fb->regs + CLCD_IENB);
 411
 412         fb_set_var(&fb->fb, &fb->fb.var);
 413
 414         printk(KERN_INFO "CLCD: %s hardware, %s display\n",
 415                fb->board->name, fb->panel->mode.name);
 416
 417         ret = register_framebuffer(&fb->fb);
 418         if (ret == 0)
 419                 goto out;
 420
 421         printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret);
 422
 423         iounmap(fb->regs);
 424  unuse_clk:
 425         clk_unuse(fb->clk);
 426  free_clk:
 427         clk_put(fb->clk);
 428  out:
 429         return ret;
 430 }
 431
 432 static int clcdfb_probe(struct amba_device *dev, void *id)
 433 {
 434         struct clcd_board *board = dev->dev.platform_data;
 435         struct clcd_fb *fb;
 436         int ret;
 437
 438         if (!board)
 439                 return -EINVAL;
 440
 441         ret = amba_request_regions(dev, NULL);
 442         if (ret) {
 443                 printk(KERN_ERR "CLCD: unable to reserve regs region\n");
 444                 goto out;
 445         }
 446
 447         fb = (struct clcd_fb *) kmalloc(sizeof(struct clcd_fb), GFP_KERNEL);
 448         if (!fb) {
 449                 printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n");
 450                 ret = -ENOMEM;
 451                 goto free_region;
 452         }
 453         memset(fb, 0, sizeof(struct clcd_fb));
 454
 455         fb->dev = dev;
 456         fb->board = board;
 457
 458         ret = fb->board->setup(fb);
 459         if (ret)
 460                 goto free_fb;
 461
 462         ret = clcdfb_register(fb);
 463         if (ret == 0) {
 464                 amba_set_drvdata(dev, fb);
 465                 goto out;
 466         }
 467
 468         fb->board->remove(fb);
 469  free_fb:
 470         kfree(fb);
 471  free_region:
 472         amba_release_regions(dev);
 473  out:
 474         return ret;
 475 }
 476
 477 static int clcdfb_remove(struct amba_device *dev)
 478 {
 479         struct clcd_fb *fb = amba_get_drvdata(dev);
 480
 481         amba_set_drvdata(dev, NULL);
 482
 483         clcdfb_disable(fb);
 484         unregister_framebuffer(&fb->fb);
 485         iounmap(fb->regs);
 486         clk_unuse(fb->clk);
 487         clk_put(fb->clk);
 488
 489         fb->board->remove(fb);
 490
 491         kfree(fb);
 492
 493         amba_release_regions(dev);
 494
 495         return 0;
 496 }
 497
 498 static struct amba_id clcdfb_id_table[] = {
 499         {
 500                 .id     = 0x00041110,
 501                 .mask   = 0x000fffff,
 502         },
 503         { 0, 0 },
 504 };
 505
 506 static struct amba_driver clcd_driver = {
 507         .drv            = {
 508                 .name   = "clcd-pl110",
 509         },
 510         .probe          = clcdfb_probe,
 511         .remove         = clcdfb_remove,
 512         .id_table       = clcdfb_id_table,
 513 };
 514
 515 int __init amba_clcdfb_init(void)
 516 {
 517         if (fb_get_options("ambafb", NULL))
 518                 return -ENODEV;
 519
 520         return amba_driver_register(&clcd_driver);
 521 }
 522
 523 module_init(amba_clcdfb_init);
 524
 525 static void __exit amba_clcdfb_exit(void)
 526 {
 527         amba_driver_unregister(&clcd_driver);
 528 }
 529
 530 module_exit(amba_clcdfb_exit);
 531
 532 MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver");
 533 MODULE_LICENSE("GPL");