drivers/video/amba-clcd.c

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