drivers/video/pxafb.c

   1 /*
   2  *  linux/drivers/video/pxafb.c
   3  *
   4  *  Copyright (C) 1999 Eric A. Thomas.
   5  *  Copyright (C) 2004 Jean-Frederic Clere.
   6  *  Copyright (C) 2004 Ian Campbell.
   7  *  Copyright (C) 2004 Jeff Lackey.
   8  *   Based on sa1100fb.c Copyright (C) 1999 Eric A. Thomas
   9  *  which in turn is
  10  *   Based on acornfb.c Copyright (C) Russell King.
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file COPYING in the main directory of this archive for
  14  * more details.
  15  *
  16  *              Intel PXA250/210 LCD Controller Frame Buffer Driver
  17  *
  18  * Please direct your questions and comments on this driver to the following
  19  * email address:
  20  *
  21  *      linux-arm-kernel@lists.arm.linux.org.uk
  22  *
  23  */
  24
  25 #include <linux/config.h>
  26 #include <linux/module.h>
  27 #include <linux/moduleparam.h>
  28 #include <linux/kernel.h>
  29 #include <linux/sched.h>
  30 #include <linux/errno.h>
  31 #include <linux/string.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/slab.h>
  34 #include <linux/fb.h>
  35 #include <linux/delay.h>
  36 #include <linux/init.h>
  37 #include <linux/ioport.h>
  38 #include <linux/cpufreq.h>
  39 #include <linux/device.h>
  40 #include <linux/dma-mapping.h>
  41
  42 #include <asm/hardware.h>
  43 #include <asm/io.h>
  44 #include <asm/irq.h>
  45 #include <asm/uaccess.h>
  46 #include <asm/div64.h>
  47 #include <asm/arch/pxa-regs.h>
  48 #include <asm/arch/bitfield.h>
  49 #include <asm/arch/pxafb.h>
  50
  51 /*
  52  * Complain if VAR is out of range.
  53  */
  54 #define DEBUG_VAR 1
  55
  56 #include "pxafb.h"
  57
  58 /* Bits which should not be set in machine configuration structures */
  59 #define LCCR0_INVALID_CONFIG_MASK (LCCR0_OUM|LCCR0_BM|LCCR0_QDM|LCCR0_DIS|LCCR0_EFM|LCCR0_IUM|LCCR0_SFM|LCCR0_LDM|LCCR0_ENB)
  60 #define LCCR3_INVALID_CONFIG_MASK (LCCR3_HSP|LCCR3_VSP|LCCR3_PCD|LCCR3_BPP)
  61
  62 static void (*pxafb_backlight_power)(int);
  63 static void (*pxafb_lcd_power)(int);
  64
  65 static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *);
  66 static void set_ctrlr_state(struct pxafb_info *fbi, u_int state);
  67
  68 #ifdef CONFIG_FB_PXA_PARAMETERS
  69 #define PXAFB_OPTIONS_SIZE 256
  70 static char g_options[PXAFB_OPTIONS_SIZE] __initdata = "";
  71 #endif
  72
  73 static inline void pxafb_schedule_work(struct pxafb_info *fbi, u_int state)
  74 {
  75         unsigned long flags;
  76
  77         local_irq_save(flags);
  78         /*
  79          * We need to handle two requests being made at the same time.
  80          * There are two important cases:
  81          *  1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE)
  82          *     We must perform the unblanking, which will do our REENABLE for us.
  83          *  2. When we are blanking, but immediately unblank before we have
  84          *     blanked.  We do the "REENABLE" thing here as well, just to be sure.
  85          */
  86         if (fbi->task_state == C_ENABLE && state == C_REENABLE)
  87                 state = (u_int) -1;
  88         if (fbi->task_state == C_DISABLE && state == C_ENABLE)
  89                 state = C_REENABLE;
  90
  91         if (state != (u_int)-1) {
  92                 fbi->task_state = state;
  93                 schedule_work(&fbi->task);
  94         }
  95         local_irq_restore(flags);
  96 }
  97
  98 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
  99 {
 100         chan &= 0xffff;
 101         chan >>= 16 - bf->length;
 102         return chan << bf->offset;
 103 }
 104
 105 static int
 106 pxafb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 107                        u_int trans, struct fb_info *info)
 108 {
 109         struct pxafb_info *fbi = (struct pxafb_info *)info;
 110         u_int val, ret = 1;
 111
 112         if (regno < fbi->palette_size) {
 113                 if (fbi->fb.var.grayscale) {
 114                         val = ((blue >> 8) & 0x00ff);
 115                 } else {
 116                         val  = ((red   >>  0) & 0xf800);
 117                         val |= ((green >>  5) & 0x07e0);
 118                         val |= ((blue  >> 11) & 0x001f);
 119                 }
 120                 fbi->palette_cpu[regno] = val;
 121                 ret = 0;
 122         }
 123         return ret;
 124 }
 125
 126 static int
 127 pxafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 128                    u_int trans, struct fb_info *info)
 129 {
 130         struct pxafb_info *fbi = (struct pxafb_info *)info;
 131         unsigned int val;
 132         int ret = 1;
 133
 134         /*
 135          * If inverse mode was selected, invert all the colours
 136          * rather than the register number.  The register number
 137          * is what you poke into the framebuffer to produce the
 138          * colour you requested.
 139          */
 140         if (fbi->cmap_inverse) {
 141                 red   = 0xffff - red;
 142                 green = 0xffff - green;
 143                 blue  = 0xffff - blue;
 144         }
 145
 146         /*
 147          * If greyscale is true, then we convert the RGB value
 148          * to greyscale no matter what visual we are using.
 149          */
 150         if (fbi->fb.var.grayscale)
 151                 red = green = blue = (19595 * red + 38470 * green +
 152                                         7471 * blue) >> 16;
 153
 154         switch (fbi->fb.fix.visual) {
 155         case FB_VISUAL_TRUECOLOR:
 156                 /*
 157                  * 16-bit True Colour.  We encode the RGB value
 158                  * according to the RGB bitfield information.
 159                  */
 160                 if (regno < 16) {
 161                         u32 *pal = fbi->fb.pseudo_palette;
 162
 163                         val  = chan_to_field(red, &fbi->fb.var.red);
 164                         val |= chan_to_field(green, &fbi->fb.var.green);
 165                         val |= chan_to_field(blue, &fbi->fb.var.blue);
 166
 167                         pal[regno] = val;
 168                         ret = 0;
 169                 }
 170                 break;
 171
 172         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 173         case FB_VISUAL_PSEUDOCOLOR:
 174                 ret = pxafb_setpalettereg(regno, red, green, blue, trans, info);
 175                 break;
 176         }
 177
 178         return ret;
 179 }
 180
 181 /*
 182  *  pxafb_bpp_to_lccr3():
 183  *    Convert a bits per pixel value to the correct bit pattern for LCCR3
 184  */
 185 static int pxafb_bpp_to_lccr3(struct fb_var_screeninfo *var)
 186 {
 187         int ret = 0;
 188         switch (var->bits_per_pixel) {
 189         case 1:  ret = LCCR3_1BPP; break;
 190         case 2:  ret = LCCR3_2BPP; break;
 191         case 4:  ret = LCCR3_4BPP; break;
 192         case 8:  ret = LCCR3_8BPP; break;
 193         case 16: ret = LCCR3_16BPP; break;
 194         }
 195         return ret;
 196 }
 197
 198 #ifdef CONFIG_CPU_FREQ
 199 /*
 200  *  pxafb_display_dma_period()
 201  *    Calculate the minimum period (in picoseconds) between two DMA
 202  *    requests for the LCD controller.  If we hit this, it means we're
 203  *    doing nothing but LCD DMA.
 204  */
 205 static unsigned int pxafb_display_dma_period(struct fb_var_screeninfo *var)
 206 {
 207        /*
 208         * Period = pixclock * bits_per_byte * bytes_per_transfer
 209         *              / memory_bits_per_pixel;
 210         */
 211        return var->pixclock * 8 * 16 / var->bits_per_pixel;
 212 }
 213
 214 extern unsigned int get_clk_frequency_khz(int info);
 215 #endif
 216
 217 /*
 218  *  pxafb_check_var():
 219  *    Get the video params out of 'var'. If a value doesn't fit, round it up,
 220  *    if it's too big, return -EINVAL.
 221  *
 222  *    Round up in the following order: bits_per_pixel, xres,
 223  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 224  *    bitfields, horizontal timing, vertical timing.
 225  */
 226 static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 227 {
 228         struct pxafb_info *fbi = (struct pxafb_info *)info;
 229
 230         if (var->xres < MIN_XRES)
 231                 var->xres = MIN_XRES;
 232         if (var->yres < MIN_YRES)
 233                 var->yres = MIN_YRES;
 234         if (var->xres > fbi->max_xres)
 235                 var->xres = fbi->max_xres;
 236         if (var->yres > fbi->max_yres)
 237                 var->yres = fbi->max_yres;
 238         var->xres_virtual =
 239                 max(var->xres_virtual, var->xres);
 240         var->yres_virtual =
 241                 max(var->yres_virtual, var->yres);
 242
 243         /*
 244          * Setup the RGB parameters for this display.
 245          *
 246          * The pixel packing format is described on page 7-11 of the
 247          * PXA2XX Developer's Manual.
 248          */
 249         if (var->bits_per_pixel == 16) {
 250                 var->red.offset   = 11; var->red.length   = 5;
 251                 var->green.offset = 5;  var->green.length = 6;
 252                 var->blue.offset  = 0;  var->blue.length  = 5;
 253                 var->transp.offset = var->transp.length = 0;
 254         } else {
 255                 var->red.offset = var->green.offset = var->blue.offset = var->transp.offset = 0;
 256                 var->red.length   = 8;
 257                 var->green.length = 8;
 258                 var->blue.length  = 8;
 259                 var->transp.length = 0;
 260         }
 261
 262 #ifdef CONFIG_CPU_FREQ
 263         DPRINTK("dma period = %d ps, clock = %d kHz\n",
 264                 pxafb_display_dma_period(var),
 265                 get_clk_frequency_khz(0));
 266 #endif
 267
 268         return 0;
 269 }
 270
 271 static inline void pxafb_set_truecolor(u_int is_true_color)
 272 {
 273         DPRINTK("true_color = %d\n", is_true_color);
 274         // do your machine-specific setup if needed
 275 }
 276
 277 /*
 278  * pxafb_set_par():
 279  *      Set the user defined part of the display for the specified console
 280  */
 281 static int pxafb_set_par(struct fb_info *info)
 282 {
 283         struct pxafb_info *fbi = (struct pxafb_info *)info;
 284         struct fb_var_screeninfo *var = &info->var;
 285         unsigned long palette_mem_size;
 286
 287         DPRINTK("set_par\n");
 288
 289         if (var->bits_per_pixel == 16)
 290                 fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
 291         else if (!fbi->cmap_static)
 292                 fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
 293         else {
 294                 /*
 295                  * Some people have weird ideas about wanting static
 296                  * pseudocolor maps.  I suspect their user space
 297                  * applications are broken.
 298                  */
 299                 fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 300         }
 301
 302         fbi->fb.fix.line_length = var->xres_virtual *
 303                                   var->bits_per_pixel / 8;
 304         if (var->bits_per_pixel == 16)
 305                 fbi->palette_size = 0;
 306         else
 307                 fbi->palette_size = var->bits_per_pixel == 1 ? 4 : 1 << var->bits_per_pixel;
 308
 309         palette_mem_size = fbi->palette_size * sizeof(u16);
 310
 311         DPRINTK("palette_mem_size = 0x%08lx\n", (u_long) palette_mem_size);
 312
 313         fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
 314         fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
 315
 316         /*
 317          * Set (any) board control register to handle new color depth
 318          */
 319         pxafb_set_truecolor(fbi->fb.fix.visual == FB_VISUAL_TRUECOLOR);
 320
 321         if (fbi->fb.var.bits_per_pixel == 16)
 322                 fb_dealloc_cmap(&fbi->fb.cmap);
 323         else
 324                 fb_alloc_cmap(&fbi->fb.cmap, 1<<fbi->fb.var.bits_per_pixel, 0);
 325
 326         pxafb_activate_var(var, fbi);
 327
 328         return 0;
 329 }
 330
 331 /*
 332  * Formal definition of the VESA spec:
 333  *  On
 334  *      This refers to the state of the display when it is in full operation
 335  *  Stand-By
 336  *      This defines an optional operating state of minimal power reduction with
 337  *      the shortest recovery time
 338  *  Suspend
 339  *      This refers to a level of power management in which substantial power
 340  *      reduction is achieved by the display.  The display can have a longer
 341  *      recovery time from this state than from the Stand-by state
 342  *  Off
 343  *      This indicates that the display is consuming the lowest level of power
 344  *      and is non-operational. Recovery from this state may optionally require
 345  *      the user to manually power on the monitor
 346  *
 347  *  Now, the fbdev driver adds an additional state, (blank), where they
 348  *  turn off the video (maybe by colormap tricks), but don't mess with the
 349  *  video itself: think of it semantically between on and Stand-By.
 350  *
 351  *  So here's what we should do in our fbdev blank routine:
 352  *
 353  *      VESA_NO_BLANKING (mode 0)       Video on,  front/back light on
 354  *      VESA_VSYNC_SUSPEND (mode 1)     Video on,  front/back light off
 355  *      VESA_HSYNC_SUSPEND (mode 2)     Video on,  front/back light off
 356  *      VESA_POWERDOWN (mode 3)         Video off, front/back light off
 357  *
 358  *  This will match the matrox implementation.
 359  */
 360
 361 /*
 362  * pxafb_blank():
 363  *      Blank the display by setting all palette values to zero.  Note, the
 364  *      16 bpp mode does not really use the palette, so this will not
 365  *      blank the display in all modes.
 366  */
 367 static int pxafb_blank(int blank, struct fb_info *info)
 368 {
 369         struct pxafb_info *fbi = (struct pxafb_info *)info;
 370         int i;
 371
 372         DPRINTK("pxafb_blank: blank=%d\n", blank);
 373
 374         switch (blank) {
 375         case FB_BLANK_POWERDOWN:
 376         case FB_BLANK_VSYNC_SUSPEND:
 377         case FB_BLANK_HSYNC_SUSPEND:
 378         case FB_BLANK_NORMAL:
 379                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 380                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 381                         for (i = 0; i < fbi->palette_size; i++)
 382                                 pxafb_setpalettereg(i, 0, 0, 0, 0, info);
 383
 384                 pxafb_schedule_work(fbi, C_DISABLE);
 385                 //TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
 386                 break;
 387
 388         case FB_BLANK_UNBLANK:
 389                 //TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
 390                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 391                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 392                         fb_set_cmap(&fbi->fb.cmap, info);
 393                 pxafb_schedule_work(fbi, C_ENABLE);
 394         }
 395         return 0;
 396 }
 397
 398 static int pxafb_mmap(struct fb_info *info, struct file *file,
 399                       struct vm_area_struct *vma)
 400 {
 401         struct pxafb_info *fbi = (struct pxafb_info *)info;
 402         unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
 403
 404         if (off < info->fix.smem_len) {
 405                 vma->vm_pgoff += 1;
 406                 return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
 407                                              fbi->map_dma, fbi->map_size);
 408         }
 409         return -EINVAL;
 410 }
 411
 412 static struct fb_ops pxafb_ops = {
 413         .owner          = THIS_MODULE,
 414         .fb_check_var   = pxafb_check_var,
 415         .fb_set_par     = pxafb_set_par,
 416         .fb_setcolreg   = pxafb_setcolreg,
 417         .fb_fillrect    = cfb_fillrect,
 418         .fb_copyarea    = cfb_copyarea,
 419         .fb_imageblit   = cfb_imageblit,
 420         .fb_blank       = pxafb_blank,
 421         .fb_cursor      = soft_cursor,
 422         .fb_mmap        = pxafb_mmap,
 423 };
 424
 425 /*
 426  * Calculate the PCD value from the clock rate (in picoseconds).
 427  * We take account of the PPCR clock setting.
 428  * From PXA Developer's Manual:
 429  *
 430  *   PixelClock =      LCLK
 431  *                -------------
 432  *                2 ( PCD + 1 )
 433  *
 434  *   PCD =      LCLK
 435  *         ------------- - 1
 436  *         2(PixelClock)
 437  *
 438  * Where:
 439  *   LCLK = LCD/Memory Clock
 440  *   PCD = LCCR3[7:0]
 441  *
 442  * PixelClock here is in Hz while the pixclock argument given is the
 443  * period in picoseconds. Hence PixelClock = 1 / ( pixclock * 10^-12 )
 444  *
 445  * The function get_lclk_frequency_10khz returns LCLK in units of
 446  * 10khz. Calling the result of this function lclk gives us the
 447  * following
 448  *
 449  *    PCD = (lclk * 10^4 ) * ( pixclock * 10^-12 )
 450  *          -------------------------------------- - 1
 451  *                          2
 452  *
 453  * Factoring the 10^4 and 10^-12 out gives 10^-8 == 1 / 100000000 as used below.
 454  */
 455 static inline unsigned int get_pcd(unsigned int pixclock)
 456 {
 457         unsigned long long pcd;
 458
 459         /* FIXME: Need to take into account Double Pixel Clock mode
 460          * (DPC) bit? or perhaps set it based on the various clock
 461          * speeds */
 462
 463         pcd = (unsigned long long)get_lcdclk_frequency_10khz() * pixclock;
 464         do_div(pcd, 100000000 * 2);
 465         /* no need for this, since we should subtract 1 anyway. they cancel */
 466         /* pcd += 1; */ /* make up for integer math truncations */
 467         return (unsigned int)pcd;
 468 }
 469
 470 /*
 471  * pxafb_activate_var():
 472  *      Configures LCD Controller based on entries in var parameter.  Settings are
 473  *      only written to the controller if changes were made.
 474  */
 475 static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *fbi)
 476 {
 477         struct pxafb_lcd_reg new_regs;
 478         u_long flags;
 479         u_int lines_per_panel, pcd = get_pcd(var->pixclock);
 480
 481         DPRINTK("Configuring PXA LCD\n");
 482
 483         DPRINTK("var: xres=%d hslen=%d lm=%d rm=%d\n",
 484                 var->xres, var->hsync_len,
 485                 var->left_margin, var->right_margin);
 486         DPRINTK("var: yres=%d vslen=%d um=%d bm=%d\n",
 487                 var->yres, var->vsync_len,
 488                 var->upper_margin, var->lower_margin);
 489         DPRINTK("var: pixclock=%d pcd=%d\n", var->pixclock, pcd);
 490
 491 #if DEBUG_VAR
 492         if (var->xres < 16        || var->xres > 1024)
 493                 printk(KERN_ERR "%s: invalid xres %d\n",
 494                         fbi->fb.fix.id, var->xres);
 495         switch(var->bits_per_pixel) {
 496         case 1:
 497         case 2:
 498         case 4:
 499         case 8:
 500         case 16:
 501                 break;
 502         default:
 503                 printk(KERN_ERR "%s: invalid bit depth %d\n",
 504                        fbi->fb.fix.id, var->bits_per_pixel);
 505                 break;
 506         }
 507         if (var->hsync_len < 1    || var->hsync_len > 64)
 508                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 509                         fbi->fb.fix.id, var->hsync_len);
 510         if (var->left_margin < 1  || var->left_margin > 255)
 511                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 512                         fbi->fb.fix.id, var->left_margin);
 513         if (var->right_margin < 1 || var->right_margin > 255)
 514                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 515                         fbi->fb.fix.id, var->right_margin);
 516         if (var->yres < 1         || var->yres > 1024)
 517                 printk(KERN_ERR "%s: invalid yres %d\n",
 518                         fbi->fb.fix.id, var->yres);
 519         if (var->vsync_len < 1    || var->vsync_len > 64)
 520                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 521                         fbi->fb.fix.id, var->vsync_len);
 522         if (var->upper_margin < 0 || var->upper_margin > 255)
 523                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 524                         fbi->fb.fix.id, var->upper_margin);
 525         if (var->lower_margin < 0 || var->lower_margin > 255)
 526                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 527                         fbi->fb.fix.id, var->lower_margin);
 528 #endif
 529
 530         new_regs.lccr0 = fbi->lccr0 |
 531                 (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
 532                  LCCR0_QDM | LCCR0_BM  | LCCR0_OUM);
 533
 534         new_regs.lccr1 =
 535                 LCCR1_DisWdth(var->xres) +
 536                 LCCR1_HorSnchWdth(var->hsync_len) +
 537                 LCCR1_BegLnDel(var->left_margin) +
 538                 LCCR1_EndLnDel(var->right_margin);
 539
 540         /*
 541          * If we have a dual scan LCD, we need to halve
 542          * the YRES parameter.
 543          */
 544         lines_per_panel = var->yres;
 545         if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
 546                 lines_per_panel /= 2;
 547
 548         new_regs.lccr2 =
 549                 LCCR2_DisHght(lines_per_panel) +
 550                 LCCR2_VrtSnchWdth(var->vsync_len) +
 551                 LCCR2_BegFrmDel(var->upper_margin) +
 552                 LCCR2_EndFrmDel(var->lower_margin);
 553
 554         new_regs.lccr3 = fbi->lccr3 |
 555                 pxafb_bpp_to_lccr3(var) |
 556                 (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
 557                 (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);
 558
 559         if (pcd)
 560                 new_regs.lccr3 |= LCCR3_PixClkDiv(pcd);
 561
 562         DPRINTK("nlccr0 = 0x%08x\n", new_regs.lccr0);
 563         DPRINTK("nlccr1 = 0x%08x\n", new_regs.lccr1);
 564         DPRINTK("nlccr2 = 0x%08x\n", new_regs.lccr2);
 565         DPRINTK("nlccr3 = 0x%08x\n", new_regs.lccr3);
 566
 567         /* Update shadow copy atomically */
 568         local_irq_save(flags);
 569
 570         /* setup dma descriptors */
 571         fbi->dmadesc_fblow_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 3*16);
 572         fbi->dmadesc_fbhigh_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 2*16);
 573         fbi->dmadesc_palette_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 1*16);
 574
 575         fbi->dmadesc_fblow_dma = fbi->palette_dma - 3*16;
 576         fbi->dmadesc_fbhigh_dma = fbi->palette_dma - 2*16;
 577         fbi->dmadesc_palette_dma = fbi->palette_dma - 1*16;
 578
 579 #define BYTES_PER_PANEL (lines_per_panel * fbi->fb.fix.line_length)
 580
 581         /* populate descriptors */
 582         fbi->dmadesc_fblow_cpu->fdadr = fbi->dmadesc_fblow_dma;
 583         fbi->dmadesc_fblow_cpu->fsadr = fbi->screen_dma + BYTES_PER_PANEL;
 584         fbi->dmadesc_fblow_cpu->fidr  = 0;
 585         fbi->dmadesc_fblow_cpu->ldcmd = BYTES_PER_PANEL;
 586
 587         fbi->fdadr1 = fbi->dmadesc_fblow_dma; /* only used in dual-panel mode */
 588
 589         fbi->dmadesc_fbhigh_cpu->fsadr = fbi->screen_dma;
 590         fbi->dmadesc_fbhigh_cpu->fidr = 0;
 591         fbi->dmadesc_fbhigh_cpu->ldcmd = BYTES_PER_PANEL;
 592
 593         fbi->dmadesc_palette_cpu->fsadr = fbi->palette_dma;
 594         fbi->dmadesc_palette_cpu->fidr  = 0;
 595         fbi->dmadesc_palette_cpu->ldcmd = (fbi->palette_size * 2) | LDCMD_PAL;
 596
 597         if (var->bits_per_pixel == 16) {
 598                 /* palette shouldn't be loaded in true-color mode */
 599                 fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
 600                 fbi->fdadr0 = fbi->dmadesc_fbhigh_dma; /* no pal just fbhigh */
 601                 /* init it to something, even though we won't be using it */
 602                 fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_palette_dma;
 603         } else {
 604                 fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
 605                 fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_palette_dma;
 606                 fbi->fdadr0 = fbi->dmadesc_palette_dma; /* flips back and forth between pal and fbhigh */
 607         }
 608
 609 #if 0
 610         DPRINTK("fbi->dmadesc_fblow_cpu = 0x%p\n", fbi->dmadesc_fblow_cpu);
 611         DPRINTK("fbi->dmadesc_fbhigh_cpu = 0x%p\n", fbi->dmadesc_fbhigh_cpu);
 612         DPRINTK("fbi->dmadesc_palette_cpu = 0x%p\n", fbi->dmadesc_palette_cpu);
 613         DPRINTK("fbi->dmadesc_fblow_dma = 0x%x\n", fbi->dmadesc_fblow_dma);
 614         DPRINTK("fbi->dmadesc_fbhigh_dma = 0x%x\n", fbi->dmadesc_fbhigh_dma);
 615         DPRINTK("fbi->dmadesc_palette_dma = 0x%x\n", fbi->dmadesc_palette_dma);
 616
 617         DPRINTK("fbi->dmadesc_fblow_cpu->fdadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fdadr);
 618         DPRINTK("fbi->dmadesc_fbhigh_cpu->fdadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fdadr);
 619         DPRINTK("fbi->dmadesc_palette_cpu->fdadr = 0x%x\n", fbi->dmadesc_palette_cpu->fdadr);
 620
 621         DPRINTK("fbi->dmadesc_fblow_cpu->fsadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fsadr);
 622         DPRINTK("fbi->dmadesc_fbhigh_cpu->fsadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fsadr);
 623         DPRINTK("fbi->dmadesc_palette_cpu->fsadr = 0x%x\n", fbi->dmadesc_palette_cpu->fsadr);
 624
 625         DPRINTK("fbi->dmadesc_fblow_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fblow_cpu->ldcmd);
 626         DPRINTK("fbi->dmadesc_fbhigh_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fbhigh_cpu->ldcmd);
 627         DPRINTK("fbi->dmadesc_palette_cpu->ldcmd = 0x%x\n", fbi->dmadesc_palette_cpu->ldcmd);
 628 #endif
 629
 630         fbi->reg_lccr0 = new_regs.lccr0;
 631         fbi->reg_lccr1 = new_regs.lccr1;
 632         fbi->reg_lccr2 = new_regs.lccr2;
 633         fbi->reg_lccr3 = new_regs.lccr3;
 634         local_irq_restore(flags);
 635
 636         /*
 637          * Only update the registers if the controller is enabled
 638          * and something has changed.
 639          */
 640         if ((LCCR0  != fbi->reg_lccr0) || (LCCR1  != fbi->reg_lccr1) ||
 641             (LCCR2  != fbi->reg_lccr2) || (LCCR3  != fbi->reg_lccr3) ||
 642             (FDADR0 != fbi->fdadr0)    || (FDADR1 != fbi->fdadr1))
 643                 pxafb_schedule_work(fbi, C_REENABLE);
 644
 645         return 0;
 646 }
 647
 648 /*
 649  * NOTE!  The following functions are purely helpers for set_ctrlr_state.
 650  * Do not call them directly; set_ctrlr_state does the correct serialisation
 651  * to ensure that things happen in the right way 100% of time time.
 652  *      -- rmk
 653  */
 654 static inline void __pxafb_backlight_power(struct pxafb_info *fbi, int on)
 655 {
 656         DPRINTK("backlight o%s\n", on ? "n" : "ff");
 657
 658         if (pxafb_backlight_power)
 659                 pxafb_backlight_power(on);
 660 }
 661
 662 static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on)
 663 {
 664         DPRINTK("LCD power o%s\n", on ? "n" : "ff");
 665
 666         if (pxafb_lcd_power)
 667                 pxafb_lcd_power(on);
 668 }
 669
 670 static void pxafb_setup_gpio(struct pxafb_info *fbi)
 671 {
 672         int gpio, ldd_bits;
 673         unsigned int lccr0 = fbi->lccr0;
 674
 675         /*
 676          * setup is based on type of panel supported
 677         */
 678
 679         /* 4 bit interface */
 680         if ((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
 681             (lccr0 & LCCR0_SDS) == LCCR0_Sngl &&
 682             (lccr0 & LCCR0_DPD) == LCCR0_4PixMono)
 683                 ldd_bits = 4;
 684
 685         /* 8 bit interface */
 686         else if (((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
 687                   ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_DPD) == LCCR0_8PixMono)) ||
 688                  ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
 689                   (lccr0 & LCCR0_PAS) == LCCR0_Pas && (lccr0 & LCCR0_SDS) == LCCR0_Sngl))
 690                 ldd_bits = 8;
 691
 692         /* 16 bit interface */
 693         else if ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
 694                  ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_PAS) == LCCR0_Act))
 695                 ldd_bits = 16;
 696
 697         else {
 698                 printk(KERN_ERR "pxafb_setup_gpio: unable to determine bits per pixel\n");
 699                 return;
 700         }
 701
 702         for (gpio = 58; ldd_bits; gpio++, ldd_bits--)
 703                 pxa_gpio_mode(gpio | GPIO_ALT_FN_2_OUT);
 704         pxa_gpio_mode(GPIO74_LCD_FCLK_MD);
 705         pxa_gpio_mode(GPIO75_LCD_LCLK_MD);
 706         pxa_gpio_mode(GPIO76_LCD_PCLK_MD);
 707         pxa_gpio_mode(GPIO77_LCD_ACBIAS_MD);
 708 }
 709
 710 static void pxafb_enable_controller(struct pxafb_info *fbi)
 711 {
 712         DPRINTK("Enabling LCD controller\n");
 713         DPRINTK("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr0);
 714         DPRINTK("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr1);
 715         DPRINTK("reg_lccr0 0x%08x\n", (unsigned int) fbi->reg_lccr0);
 716         DPRINTK("reg_lccr1 0x%08x\n", (unsigned int) fbi->reg_lccr1);
 717         DPRINTK("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2);
 718         DPRINTK("reg_lccr3 0x%08x\n", (unsigned int) fbi->reg_lccr3);
 719
 720         /* enable LCD controller clock */
 721         pxa_set_cken(CKEN16_LCD, 1);
 722
 723         /* Sequence from 11.7.10 */
 724         LCCR3 = fbi->reg_lccr3;
 725         LCCR2 = fbi->reg_lccr2;
 726         LCCR1 = fbi->reg_lccr1;
 727         LCCR0 = fbi->reg_lccr0 & ~LCCR0_ENB;
 728
 729         FDADR0 = fbi->fdadr0;
 730         FDADR1 = fbi->fdadr1;
 731         LCCR0 |= LCCR0_ENB;
 732
 733         DPRINTK("FDADR0 0x%08x\n", (unsigned int) FDADR0);
 734         DPRINTK("FDADR1 0x%08x\n", (unsigned int) FDADR1);
 735         DPRINTK("LCCR0 0x%08x\n", (unsigned int) LCCR0);
 736         DPRINTK("LCCR1 0x%08x\n", (unsigned int) LCCR1);
 737         DPRINTK("LCCR2 0x%08x\n", (unsigned int) LCCR2);
 738         DPRINTK("LCCR3 0x%08x\n", (unsigned int) LCCR3);
 739 }
 740
 741 static void pxafb_disable_controller(struct pxafb_info *fbi)
 742 {
 743         DECLARE_WAITQUEUE(wait, current);
 744
 745         DPRINTK("Disabling LCD controller\n");
 746
 747         set_current_state(TASK_UNINTERRUPTIBLE);
 748         add_wait_queue(&fbi->ctrlr_wait, &wait);
 749
 750         LCSR = 0xffffffff;      /* Clear LCD Status Register */
 751         LCCR0 &= ~LCCR0_LDM;    /* Enable LCD Disable Done Interrupt */
 752         LCCR0 |= LCCR0_DIS;     /* Disable LCD Controller */
 753
 754         schedule_timeout(20 * HZ / 1000);
 755         remove_wait_queue(&fbi->ctrlr_wait, &wait);
 756
 757         /* disable LCD controller clock */
 758         pxa_set_cken(CKEN16_LCD, 0);
 759 }
 760
 761 /*
 762  *  pxafb_handle_irq: Handle 'LCD DONE' interrupts.
 763  */
 764 static irqreturn_t pxafb_handle_irq(int irq, void *dev_id, struct pt_regs *regs)
 765 {
 766         struct pxafb_info *fbi = dev_id;
 767         unsigned int lcsr = LCSR;
 768
 769         if (lcsr & LCSR_LDD) {
 770                 LCCR0 |= LCCR0_LDM;
 771                 wake_up(&fbi->ctrlr_wait);
 772         }
 773
 774         LCSR = lcsr;
 775         return IRQ_HANDLED;
 776 }
 777
 778 /*
 779  * This function must be called from task context only, since it will
 780  * sleep when disabling the LCD controller, or if we get two contending
 781  * processes trying to alter state.
 782  */
 783 static void set_ctrlr_state(struct pxafb_info *fbi, u_int state)
 784 {
 785         u_int old_state;
 786
 787         down(&fbi->ctrlr_sem);
 788
 789         old_state = fbi->state;
 790
 791         /*
 792          * Hack around fbcon initialisation.
 793          */
 794         if (old_state == C_STARTUP && state == C_REENABLE)
 795                 state = C_ENABLE;
 796
 797         switch (state) {
 798         case C_DISABLE_CLKCHANGE:
 799                 /*
 800                  * Disable controller for clock change.  If the
 801                  * controller is already disabled, then do nothing.
 802                  */
 803                 if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
 804                         fbi->state = state;
 805                         //TODO __pxafb_lcd_power(fbi, 0);
 806                         pxafb_disable_controller(fbi);
 807                 }
 808                 break;
 809
 810         case C_DISABLE_PM:
 811         case C_DISABLE:
 812                 /*
 813                  * Disable controller
 814                  */
 815                 if (old_state != C_DISABLE) {
 816                         fbi->state = state;
 817                         __pxafb_backlight_power(fbi, 0);
 818                         __pxafb_lcd_power(fbi, 0);
 819                         if (old_state != C_DISABLE_CLKCHANGE)
 820                                 pxafb_disable_controller(fbi);
 821                 }
 822                 break;
 823
 824         case C_ENABLE_CLKCHANGE:
 825                 /*
 826                  * Enable the controller after clock change.  Only
 827                  * do this if we were disabled for the clock change.
 828                  */
 829                 if (old_state == C_DISABLE_CLKCHANGE) {
 830                         fbi->state = C_ENABLE;
 831                         pxafb_enable_controller(fbi);
 832                         //TODO __pxafb_lcd_power(fbi, 1);
 833                 }
 834                 break;
 835
 836         case C_REENABLE:
 837                 /*
 838                  * Re-enable the controller only if it was already
 839                  * enabled.  This is so we reprogram the control
 840                  * registers.
 841                  */
 842                 if (old_state == C_ENABLE) {
 843                         pxafb_disable_controller(fbi);
 844                         pxafb_setup_gpio(fbi);
 845                         pxafb_enable_controller(fbi);
 846                 }
 847                 break;
 848
 849         case C_ENABLE_PM:
 850                 /*
 851                  * Re-enable the controller after PM.  This is not
 852                  * perfect - think about the case where we were doing
 853                  * a clock change, and we suspended half-way through.
 854                  */
 855                 if (old_state != C_DISABLE_PM)
 856                         break;
 857                 /* fall through */
 858
 859         case C_ENABLE:
 860                 /*
 861                  * Power up the LCD screen, enable controller, and
 862                  * turn on the backlight.
 863                  */
 864                 if (old_state != C_ENABLE) {
 865                         fbi->state = C_ENABLE;
 866                         pxafb_setup_gpio(fbi);
 867                         pxafb_enable_controller(fbi);
 868                         __pxafb_lcd_power(fbi, 1);
 869                         __pxafb_backlight_power(fbi, 1);
 870                 }
 871                 break;
 872         }
 873         up(&fbi->ctrlr_sem);
 874 }
 875
 876 /*
 877  * Our LCD controller task (which is called when we blank or unblank)
 878  * via keventd.
 879  */
 880 static void pxafb_task(void *dummy)
 881 {
 882         struct pxafb_info *fbi = dummy;
 883         u_int state = xchg(&fbi->task_state, -1);
 884
 885         set_ctrlr_state(fbi, state);
 886 }
 887
 888 #ifdef CONFIG_CPU_FREQ
 889 /*
 890  * CPU clock speed change handler.  We need to adjust the LCD timing
 891  * parameters when the CPU clock is adjusted by the power management
 892  * subsystem.
 893  *
 894  * TODO: Determine why f->new != 10*get_lclk_frequency_10khz()
 895  */
 896 static int
 897 pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
 898 {
 899         struct pxafb_info *fbi = TO_INF(nb, freq_transition);
 900         //TODO struct cpufreq_freqs *f = data;
 901         u_int pcd;
 902
 903         switch (val) {
 904         case CPUFREQ_PRECHANGE:
 905                 set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
 906                 break;
 907
 908         case CPUFREQ_POSTCHANGE:
 909                 pcd = get_pcd(fbi->fb.var.pixclock);
 910                 fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
 911                 set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
 912                 break;
 913         }
 914         return 0;
 915 }
 916
 917 static int
 918 pxafb_freq_policy(struct notifier_block *nb, unsigned long val, void *data)
 919 {
 920         struct pxafb_info *fbi = TO_INF(nb, freq_policy);
 921         struct fb_var_screeninfo *var = &fbi->fb.var;
 922         struct cpufreq_policy *policy = data;
 923
 924         switch (val) {
 925         case CPUFREQ_ADJUST:
 926         case CPUFREQ_INCOMPATIBLE:
 927                 printk(KERN_DEBUG "min dma period: %d ps, "
 928                         "new clock %d kHz\n", pxafb_display_dma_period(var),
 929                         policy->max);
 930                 // TODO: fill in min/max values
 931                 break;
 932 #if 0
 933         case CPUFREQ_NOTIFY:
 934                 printk(KERN_ERR "%s: got CPUFREQ_NOTIFY\n", __FUNCTION__);
 935                 do {} while(0);
 936                 /* todo: panic if min/max values aren't fulfilled
 937                  * [can't really happen unless there's a bug in the
 938                  * CPU policy verification process *
 939                  */
 940                 break;
 941 #endif
 942         }
 943         return 0;
 944 }
 945 #endif
 946
 947 #ifdef CONFIG_PM
 948 /*
 949  * Power management hooks.  Note that we won't be called from IRQ context,
 950  * unlike the blank functions above, so we may sleep.
 951  */
 952 static int pxafb_suspend(struct device *dev, pm_message_t state, u32 level)
 953 {
 954         struct pxafb_info *fbi = dev_get_drvdata(dev);
 955
 956         if (level == SUSPEND_DISABLE || level == SUSPEND_POWER_DOWN)
 957                 set_ctrlr_state(fbi, C_DISABLE_PM);
 958         return 0;
 959 }
 960
 961 static int pxafb_resume(struct device *dev, u32 level)
 962 {
 963         struct pxafb_info *fbi = dev_get_drvdata(dev);
 964
 965         if (level == RESUME_ENABLE)
 966                 set_ctrlr_state(fbi, C_ENABLE_PM);
 967         return 0;
 968 }
 969 #else
 970 #define pxafb_suspend   NULL
 971 #define pxafb_resume    NULL
 972 #endif
 973
 974 /*
 975  * pxafb_map_video_memory():
 976  *      Allocates the DRAM memory for the frame buffer.  This buffer is
 977  *      remapped into a non-cached, non-buffered, memory region to
 978  *      allow palette and pixel writes to occur without flushing the
 979  *      cache.  Once this area is remapped, all virtual memory
 980  *      access to the video memory should occur at the new region.
 981  */
 982 static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
 983 {
 984         u_long palette_mem_size;
 985
 986         /*
 987          * We reserve one page for the palette, plus the size
 988          * of the framebuffer.
 989          */
 990         fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
 991         fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
 992                                               &fbi->map_dma, GFP_KERNEL);
 993
 994         if (fbi->map_cpu) {
 995                 /* prevent initial garbage on screen */
 996                 memset(fbi->map_cpu, 0, fbi->map_size);
 997                 fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
 998                 fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
 999                 /*
1000                  * FIXME: this is actually the wrong thing to place in
1001                  * smem_start.  But fbdev suffers from the problem that
1002                  * it needs an API which doesn't exist (in this case,
1003                  * dma_writecombine_mmap)
1004                  */
1005                 fbi->fb.fix.smem_start = fbi->screen_dma;
1006
1007                 fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;
1008
1009                 palette_mem_size = fbi->palette_size * sizeof(u16);
1010                 DPRINTK("palette_mem_size = 0x%08lx\n", (u_long) palette_mem_size);
1011
1012                 fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
1013                 fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
1014         }
1015
1016         return fbi->map_cpu ? 0 : -ENOMEM;
1017 }
1018
1019 static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
1020 {
1021         struct pxafb_info *fbi;
1022         void *addr;
1023         struct pxafb_mach_info *inf = dev->platform_data;
1024
1025         /* Alloc the pxafb_info and pseudo_palette in one step */
1026         fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
1027         if (!fbi)
1028                 return NULL;
1029
1030         memset(fbi, 0, sizeof(struct pxafb_info));
1031         fbi->dev = dev;
1032
1033         strcpy(fbi->fb.fix.id, PXA_NAME);
1034
1035         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
1036         fbi->fb.fix.type_aux    = 0;
1037         fbi->fb.fix.xpanstep    = 0;
1038         fbi->fb.fix.ypanstep    = 0;
1039         fbi->fb.fix.ywrapstep   = 0;
1040         fbi->fb.fix.accel       = FB_ACCEL_NONE;
1041
1042         fbi->fb.var.nonstd      = 0;
1043         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
1044         fbi->fb.var.height      = -1;
1045         fbi->fb.var.width       = -1;
1046         fbi->fb.var.accel_flags = 0;
1047         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
1048
1049         fbi->fb.fbops           = &pxafb_ops;
1050         fbi->fb.flags           = FBINFO_DEFAULT;
1051         fbi->fb.node            = -1;
1052
1053         addr = fbi;
1054         addr = addr + sizeof(struct pxafb_info);
1055         fbi->fb.pseudo_palette  = addr;
1056
1057         fbi->max_xres                   = inf->xres;
1058         fbi->fb.var.xres                = inf->xres;
1059         fbi->fb.var.xres_virtual        = inf->xres;
1060         fbi->max_yres                   = inf->yres;
1061         fbi->fb.var.yres                = inf->yres;
1062         fbi->fb.var.yres_virtual        = inf->yres;
1063         fbi->max_bpp                    = inf->bpp;
1064         fbi->fb.var.bits_per_pixel      = inf->bpp;
1065         fbi->fb.var.pixclock            = inf->pixclock;
1066         fbi->fb.var.hsync_len           = inf->hsync_len;
1067         fbi->fb.var.left_margin         = inf->left_margin;
1068         fbi->fb.var.right_margin        = inf->right_margin;
1069         fbi->fb.var.vsync_len           = inf->vsync_len;
1070         fbi->fb.var.upper_margin        = inf->upper_margin;
1071         fbi->fb.var.lower_margin        = inf->lower_margin;
1072         fbi->fb.var.sync                = inf->sync;
1073         fbi->fb.var.grayscale           = inf->cmap_greyscale;
1074         fbi->cmap_inverse               = inf->cmap_inverse;
1075         fbi->cmap_static                = inf->cmap_static;
1076         fbi->lccr0                      = inf->lccr0;
1077         fbi->lccr3                      = inf->lccr3;
1078         fbi->state                      = C_STARTUP;
1079         fbi->task_state                 = (u_char)-1;
1080         fbi->fb.fix.smem_len            = fbi->max_xres * fbi->max_yres *
1081                                           fbi->max_bpp / 8;
1082
1083         init_waitqueue_head(&fbi->ctrlr_wait);
1084         INIT_WORK(&fbi->task, pxafb_task, fbi);
1085         init_MUTEX(&fbi->ctrlr_sem);
1086
1087         return fbi;
1088 }
1089
1090 #ifdef CONFIG_FB_PXA_PARAMETERS
1091 static int __init pxafb_parse_options(struct device *dev, char *options)
1092 {
1093         struct pxafb_mach_info *inf = dev->platform_data;
1094         char *this_opt;
1095
1096         if (!options || !*options)
1097                 return 0;
1098
1099         dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");
1100
1101         /* could be made table driven or similar?... */
1102         while ((this_opt = strsep(&options, ",")) != NULL) {
1103                 if (!strncmp(this_opt, "mode:", 5)) {
1104                         const char *name = this_opt+5;
1105                         unsigned int namelen = strlen(name);
1106                         int res_specified = 0, bpp_specified = 0;
1107                         unsigned int xres = 0, yres = 0, bpp = 0;
1108                         int yres_specified = 0;
1109                         int i;
1110                         for (i = namelen-1; i >= 0; i--) {
1111                                 switch (name[i]) {
1112                                 case '-':
1113                                         namelen = i;
1114                                         if (!bpp_specified && !yres_specified) {
1115                                                 bpp = simple_strtoul(&name[i+1], NULL, 0);
1116                                                 bpp_specified = 1;
1117                                         } else
1118                                                 goto done;
1119                                         break;
1120                                 case 'x':
1121                                         if (!yres_specified) {
1122                                                 yres = simple_strtoul(&name[i+1], NULL, 0);
1123                                                 yres_specified = 1;
1124                                         } else
1125                                                 goto done;
1126                                         break;
1127                                 case '0'...'9':
1128                                         break;
1129                                 default:
1130                                         goto done;
1131                                 }
1132                         }
1133                         if (i < 0 && yres_specified) {
1134                                 xres = simple_strtoul(name, NULL, 0);
1135                                 res_specified = 1;
1136                         }
1137                 done:
1138                         if (res_specified) {
1139                                 dev_info(dev, "overriding resolution: %dx%d\n", xres, yres);
1140                                 inf->xres = xres; inf->yres = yres;
1141                         }
1142                         if (bpp_specified)
1143                                 switch (bpp) {
1144                                 case 1:
1145                                 case 2:
1146                                 case 4:
1147                                 case 8:
1148                                 case 16:
1149                                         inf->bpp = bpp;
1150                                         dev_info(dev, "overriding bit depth: %d\n", bpp);
1151                                         break;
1152                                 default:
1153                                         dev_err(dev, "Depth %d is not valid\n", bpp);
1154                                 }
1155                 } else if (!strncmp(this_opt, "pixclock:", 9)) {
1156                         inf->pixclock = simple_strtoul(this_opt+9, NULL, 0);
1157                         dev_info(dev, "override pixclock: %ld\n", inf->pixclock);
1158                 } else if (!strncmp(this_opt, "left:", 5)) {
1159                         inf->left_margin = simple_strtoul(this_opt+5, NULL, 0);
1160                         dev_info(dev, "override left: %u\n", inf->left_margin);
1161                 } else if (!strncmp(this_opt, "right:", 6)) {
1162                         inf->right_margin = simple_strtoul(this_opt+6, NULL, 0);
1163                         dev_info(dev, "override right: %u\n", inf->right_margin);
1164                 } else if (!strncmp(this_opt, "upper:", 6)) {
1165                         inf->upper_margin = simple_strtoul(this_opt+6, NULL, 0);
1166                         dev_info(dev, "override upper: %u\n", inf->upper_margin);
1167                 } else if (!strncmp(this_opt, "lower:", 6)) {
1168                         inf->lower_margin = simple_strtoul(this_opt+6, NULL, 0);
1169                         dev_info(dev, "override lower: %u\n", inf->lower_margin);
1170                 } else if (!strncmp(this_opt, "hsynclen:", 9)) {
1171                         inf->hsync_len = simple_strtoul(this_opt+9, NULL, 0);
1172                         dev_info(dev, "override hsynclen: %u\n", inf->hsync_len);
1173                 } else if (!strncmp(this_opt, "vsynclen:", 9)) {
1174                         inf->vsync_len = simple_strtoul(this_opt+9, NULL, 0);
1175                         dev_info(dev, "override vsynclen: %u\n", inf->vsync_len);
1176                 } else if (!strncmp(this_opt, "hsync:", 6)) {
1177                         if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
1178                                 dev_info(dev, "override hsync: Active Low\n");
1179                                 inf->sync &= ~FB_SYNC_HOR_HIGH_ACT;
1180                         } else {
1181                                 dev_info(dev, "override hsync: Active High\n");
1182                                 inf->sync |= FB_SYNC_HOR_HIGH_ACT;
1183                         }
1184                 } else if (!strncmp(this_opt, "vsync:", 6)) {
1185                         if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
1186                                 dev_info(dev, "override vsync: Active Low\n");
1187                                 inf->sync &= ~FB_SYNC_VERT_HIGH_ACT;
1188                         } else {
1189                                 dev_info(dev, "override vsync: Active High\n");
1190                                 inf->sync |= FB_SYNC_VERT_HIGH_ACT;
1191                         }
1192                 } else if (!strncmp(this_opt, "dpc:", 4)) {
1193                         if (simple_strtoul(this_opt+4, NULL, 0) == 0) {
1194                                 dev_info(dev, "override double pixel clock: false\n");
1195                                 inf->lccr3 &= ~LCCR3_DPC;
1196                         } else {
1197                                 dev_info(dev, "override double pixel clock: true\n");
1198                                 inf->lccr3 |= LCCR3_DPC;
1199                         }
1200                 } else if (!strncmp(this_opt, "outputen:", 9)) {
1201                         if (simple_strtoul(this_opt+9, NULL, 0) == 0) {
1202                                 dev_info(dev, "override output enable: active low\n");
1203                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL;
1204                         } else {
1205                                 dev_info(dev, "override output enable: active high\n");
1206                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnH;
1207                         }
1208                 } else if (!strncmp(this_opt, "pixclockpol:", 12)) {
1209                         if (simple_strtoul(this_opt+12, NULL, 0) == 0) {
1210                                 dev_info(dev, "override pixel clock polarity: falling edge\n");
1211                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg;
1212                         } else {
1213                                 dev_info(dev, "override pixel clock polarity: rising edge\n");
1214                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixRsEdg;
1215                         }
1216                 } else if (!strncmp(this_opt, "color", 5)) {
1217                         inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Color;
1218                 } else if (!strncmp(this_opt, "mono", 4)) {
1219                         inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Mono;
1220                 } else if (!strncmp(this_opt, "active", 6)) {
1221                         inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Act;
1222                 } else if (!strncmp(this_opt, "passive", 7)) {
1223                         inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Pas;
1224                 } else if (!strncmp(this_opt, "single", 6)) {
1225                         inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Sngl;
1226                 } else if (!strncmp(this_opt, "dual", 4)) {
1227                         inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Dual;
1228                 } else if (!strncmp(this_opt, "4pix", 4)) {
1229                         inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_4PixMono;
1230                 } else if (!strncmp(this_opt, "8pix", 4)) {
1231                         inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_8PixMono;
1232                 } else {
1233                         dev_err(dev, "unknown option: %s\n", this_opt);
1234                         return -EINVAL;
1235                 }
1236         }
1237         return 0;
1238
1239 }
1240 #endif
1241
1242 int __init pxafb_probe(struct device *dev)
1243 {
1244         struct pxafb_info *fbi;
1245         struct pxafb_mach_info *inf;
1246         int ret;
1247
1248         dev_dbg(dev, "pxafb_probe\n");
1249
1250         inf = dev->platform_data;
1251         ret = -ENOMEM;
1252         fbi = NULL;
1253         if (!inf)
1254                 goto failed;
1255
1256 #ifdef CONFIG_FB_PXA_PARAMETERS
1257         ret = pxafb_parse_options(dev, g_options);
1258         if (ret < 0)
1259                 goto failed;
1260 #endif
1261
1262 #ifdef DEBUG_VAR
1263         /* Check for various illegal bit-combinations. Currently only
1264          * a warning is given. */
1265
1266         if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK)
1267                 dev_warn(dev, "machine LCCR0 setting contains illegal bits: %08x\n",
1268                         inf->lccr0 & LCCR0_INVALID_CONFIG_MASK);
1269         if (inf->lccr3 & LCCR3_INVALID_CONFIG_MASK)
1270                 dev_warn(dev, "machine LCCR3 setting contains illegal bits: %08x\n",
1271                         inf->lccr3 & LCCR3_INVALID_CONFIG_MASK);
1272         if (inf->lccr0 & LCCR0_DPD &&
1273             ((inf->lccr0 & LCCR0_PAS) != LCCR0_Pas ||
1274              (inf->lccr0 & LCCR0_SDS) != LCCR0_Sngl ||
1275              (inf->lccr0 & LCCR0_CMS) != LCCR0_Mono))
1276                 dev_warn(dev, "Double Pixel Data (DPD) mode is only valid in passive mono"
1277                          " single panel mode\n");
1278         if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Act &&
1279             (inf->lccr0 & LCCR0_SDS) == LCCR0_Dual)
1280                 dev_warn(dev, "Dual panel only valid in passive mode\n");
1281         if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
1282              (inf->upper_margin || inf->lower_margin))
1283                 dev_warn(dev, "Upper and lower margins must be 0 in passive mode\n");
1284 #endif
1285
1286         dev_dbg(dev, "got a %dx%dx%d LCD\n",inf->xres, inf->yres, inf->bpp);
1287         if (inf->xres == 0 || inf->yres == 0 || inf->bpp == 0) {
1288                 dev_err(dev, "Invalid resolution or bit depth\n");
1289                 ret = -EINVAL;
1290                 goto failed;
1291         }
1292         pxafb_backlight_power = inf->pxafb_backlight_power;
1293         pxafb_lcd_power = inf->pxafb_lcd_power;
1294         fbi = pxafb_init_fbinfo(dev);
1295         if (!fbi) {
1296                 dev_err(dev, "Failed to initialize framebuffer device\n");
1297                 ret = -ENOMEM; // only reason for pxafb_init_fbinfo to fail is kmalloc
1298                 goto failed;
1299         }
1300
1301         /* Initialize video memory */
1302         ret = pxafb_map_video_memory(fbi);
1303         if (ret) {
1304                 dev_err(dev, "Failed to allocate video RAM: %d\n", ret);
1305                 ret = -ENOMEM;
1306                 goto failed;
1307         }
1308
1309         ret = request_irq(IRQ_LCD, pxafb_handle_irq, SA_INTERRUPT, "LCD", fbi);
1310         if (ret) {
1311                 dev_err(dev, "request_irq failed: %d\n", ret);
1312                 ret = -EBUSY;
1313                 goto failed;
1314         }
1315
1316         /*
1317          * This makes sure that our colour bitfield
1318          * descriptors are correctly initialised.
1319          */
1320         pxafb_check_var(&fbi->fb.var, &fbi->fb);
1321         pxafb_set_par(&fbi->fb);
1322
1323         dev_set_drvdata(dev, fbi);
1324
1325         ret = register_framebuffer(&fbi->fb);
1326         if (ret < 0) {
1327                 dev_err(dev, "Failed to register framebuffer device: %d\n", ret);
1328                 goto failed;
1329         }
1330
1331 #ifdef CONFIG_PM
1332         // TODO
1333 #endif
1334
1335 #ifdef CONFIG_CPU_FREQ
1336         fbi->freq_transition.notifier_call = pxafb_freq_transition;
1337         fbi->freq_policy.notifier_call = pxafb_freq_policy;
1338         cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
1339         cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
1340 #endif
1341
1342         /*
1343          * Ok, now enable the LCD controller
1344          */
1345         set_ctrlr_state(fbi, C_ENABLE);
1346
1347         return 0;
1348
1349 failed:
1350         dev_set_drvdata(dev, NULL);
1351         kfree(fbi);
1352         return ret;
1353 }
1354
1355 static struct device_driver pxafb_driver = {
1356         .name           = "pxa2xx-fb",
1357         .bus            = &platform_bus_type,
1358         .probe          = pxafb_probe,
1359 #ifdef CONFIG_PM
1360         .suspend        = pxafb_suspend,
1361         .resume         = pxafb_resume,
1362 #endif
1363 };
1364
1365 #ifndef MODULE
1366 int __devinit pxafb_setup(char *options)
1367 {
1368 # ifdef CONFIG_FB_PXA_PARAMETERS
1369         strlcpy(g_options, options, sizeof(g_options));
1370 # endif
1371         return 0;
1372 }
1373 #else
1374 # ifdef CONFIG_FB_PXA_PARAMETERS
1375 module_param_string(options, g_options, sizeof(g_options), 0);
1376 MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)");
1377 # endif
1378 #endif
1379
1380 int __devinit pxafb_init(void)
1381 {
1382 #ifndef MODULE
1383         char *option = NULL;
1384
1385         if (fb_get_options("pxafb", &option))
1386                 return -ENODEV;
1387         pxafb_setup(option);
1388 #endif
1389         return driver_register(&pxafb_driver);
1390 }
1391
1392 module_init(pxafb_init);
1393
1394 MODULE_DESCRIPTION("loadable framebuffer driver for PXA");
1395 MODULE_LICENSE("GPL");