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   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/module.h>
  26 #include <linux/moduleparam.h>
  27 #include <linux/kernel.h>
  28 #include <linux/sched.h>
  29 #include <linux/errno.h>
  30 #include <linux/string.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/slab.h>
  33 #include <linux/fb.h>
  34 #include <linux/delay.h>
  35 #include <linux/init.h>
  36 #include <linux/ioport.h>
  37 #include <linux/cpufreq.h>
  38 #include <linux/platform_device.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/clk.h>
  41 #include <linux/err.h>
  42
  43 #include <asm/hardware.h>
  44 #include <asm/io.h>
  45 #include <asm/irq.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, struct fb_var_screeninfo *);
  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] __devinitdata = "";
  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;
 111
 112         if (regno >= fbi->palette_size)
 113                 return 1;
 114
 115         if (fbi->fb.var.grayscale) {
 116                 fbi->palette_cpu[regno] = ((blue >> 8) & 0x00ff);
 117                 return 0;
 118         }
 119
 120         switch (fbi->lccr4 & LCCR4_PAL_FOR_MASK) {
 121         case LCCR4_PAL_FOR_0:
 122                 val  = ((red   >>  0) & 0xf800);
 123                 val |= ((green >>  5) & 0x07e0);
 124                 val |= ((blue  >> 11) & 0x001f);
 125                 fbi->palette_cpu[regno] = val;
 126                 break;
 127         case LCCR4_PAL_FOR_1:
 128                 val  = ((red   << 8) & 0x00f80000);
 129                 val |= ((green >> 0) & 0x0000fc00);
 130                 val |= ((blue  >> 8) & 0x000000f8);
 131                 ((u32*)(fbi->palette_cpu))[regno] = val;
 132                 break;
 133         case LCCR4_PAL_FOR_2:
 134                 val  = ((red   << 8) & 0x00fc0000);
 135                 val |= ((green >> 0) & 0x0000fc00);
 136                 val |= ((blue  >> 8) & 0x000000fc);
 137                 ((u32*)(fbi->palette_cpu))[regno] = val;
 138                 break;
 139         }
 140
 141         return 0;
 142 }
 143
 144 static int
 145 pxafb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 146                    u_int trans, struct fb_info *info)
 147 {
 148         struct pxafb_info *fbi = (struct pxafb_info *)info;
 149         unsigned int val;
 150         int ret = 1;
 151
 152         /*
 153          * If inverse mode was selected, invert all the colours
 154          * rather than the register number.  The register number
 155          * is what you poke into the framebuffer to produce the
 156          * colour you requested.
 157          */
 158         if (fbi->cmap_inverse) {
 159                 red   = 0xffff - red;
 160                 green = 0xffff - green;
 161                 blue  = 0xffff - blue;
 162         }
 163
 164         /*
 165          * If greyscale is true, then we convert the RGB value
 166          * to greyscale no matter what visual we are using.
 167          */
 168         if (fbi->fb.var.grayscale)
 169                 red = green = blue = (19595 * red + 38470 * green +
 170                                         7471 * blue) >> 16;
 171
 172         switch (fbi->fb.fix.visual) {
 173         case FB_VISUAL_TRUECOLOR:
 174                 /*
 175                  * 16-bit True Colour.  We encode the RGB value
 176                  * according to the RGB bitfield information.
 177                  */
 178                 if (regno < 16) {
 179                         u32 *pal = fbi->fb.pseudo_palette;
 180
 181                         val  = chan_to_field(red, &fbi->fb.var.red);
 182                         val |= chan_to_field(green, &fbi->fb.var.green);
 183                         val |= chan_to_field(blue, &fbi->fb.var.blue);
 184
 185                         pal[regno] = val;
 186                         ret = 0;
 187                 }
 188                 break;
 189
 190         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 191         case FB_VISUAL_PSEUDOCOLOR:
 192                 ret = pxafb_setpalettereg(regno, red, green, blue, trans, info);
 193                 break;
 194         }
 195
 196         return ret;
 197 }
 198
 199 /*
 200  *  pxafb_bpp_to_lccr3():
 201  *    Convert a bits per pixel value to the correct bit pattern for LCCR3
 202  */
 203 static int pxafb_bpp_to_lccr3(struct fb_var_screeninfo *var)
 204 {
 205         int ret = 0;
 206         switch (var->bits_per_pixel) {
 207         case 1:  ret = LCCR3_1BPP; break;
 208         case 2:  ret = LCCR3_2BPP; break;
 209         case 4:  ret = LCCR3_4BPP; break;
 210         case 8:  ret = LCCR3_8BPP; break;
 211         case 16: ret = LCCR3_16BPP; break;
 212         }
 213         return ret;
 214 }
 215
 216 #ifdef CONFIG_CPU_FREQ
 217 /*
 218  *  pxafb_display_dma_period()
 219  *    Calculate the minimum period (in picoseconds) between two DMA
 220  *    requests for the LCD controller.  If we hit this, it means we're
 221  *    doing nothing but LCD DMA.
 222  */
 223 static unsigned int pxafb_display_dma_period(struct fb_var_screeninfo *var)
 224 {
 225        /*
 226         * Period = pixclock * bits_per_byte * bytes_per_transfer
 227         *              / memory_bits_per_pixel;
 228         */
 229        return var->pixclock * 8 * 16 / var->bits_per_pixel;
 230 }
 231
 232 extern unsigned int get_clk_frequency_khz(int info);
 233 #endif
 234
 235 /*
 236  * Select the smallest mode that allows the desired resolution to be
 237  * displayed. If desired parameters can be rounded up.
 238  */
 239 static struct pxafb_mode_info *pxafb_getmode(struct pxafb_mach_info *mach, struct fb_var_screeninfo *var)
 240 {
 241         struct pxafb_mode_info *mode = NULL;
 242         struct pxafb_mode_info *modelist = mach->modes;
 243         unsigned int best_x = 0xffffffff, best_y = 0xffffffff;
 244         unsigned int i;
 245
 246         for (i = 0 ; i < mach->num_modes ; i++) {
 247                 if (modelist[i].xres >= var->xres && modelist[i].yres >= var->yres &&
 248                                 modelist[i].xres < best_x && modelist[i].yres < best_y &&
 249                                 modelist[i].bpp >= var->bits_per_pixel ) {
 250                         best_x = modelist[i].xres;
 251                         best_y = modelist[i].yres;
 252                         mode = &modelist[i];
 253                 }
 254         }
 255
 256         return mode;
 257 }
 258
 259 static void pxafb_setmode(struct fb_var_screeninfo *var, struct pxafb_mode_info *mode)
 260 {
 261         var->xres               = mode->xres;
 262         var->yres               = mode->yres;
 263         var->bits_per_pixel     = mode->bpp;
 264         var->pixclock           = mode->pixclock;
 265         var->hsync_len          = mode->hsync_len;
 266         var->left_margin        = mode->left_margin;
 267         var->right_margin       = mode->right_margin;
 268         var->vsync_len          = mode->vsync_len;
 269         var->upper_margin       = mode->upper_margin;
 270         var->lower_margin       = mode->lower_margin;
 271         var->sync               = mode->sync;
 272         var->grayscale          = mode->cmap_greyscale;
 273         var->xres_virtual       = var->xres;
 274         var->yres_virtual       = var->yres;
 275 }
 276
 277 /*
 278  *  pxafb_check_var():
 279  *    Get the video params out of 'var'. If a value doesn't fit, round it up,
 280  *    if it's too big, return -EINVAL.
 281  *
 282  *    Round up in the following order: bits_per_pixel, xres,
 283  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 284  *    bitfields, horizontal timing, vertical timing.
 285  */
 286 static int pxafb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 287 {
 288         struct pxafb_info *fbi = (struct pxafb_info *)info;
 289         struct pxafb_mach_info *inf = fbi->dev->platform_data;
 290
 291         if (var->xres < MIN_XRES)
 292                 var->xres = MIN_XRES;
 293         if (var->yres < MIN_YRES)
 294                 var->yres = MIN_YRES;
 295
 296         if (inf->fixed_modes) {
 297                 struct pxafb_mode_info *mode;
 298
 299                 mode = pxafb_getmode(inf, var);
 300                 if (!mode)
 301                         return -EINVAL;
 302                 pxafb_setmode(var, mode);
 303         } else {
 304                 if (var->xres > inf->modes->xres)
 305                         return -EINVAL;
 306                 if (var->yres > inf->modes->yres)
 307                         return -EINVAL;
 308                 if (var->bits_per_pixel > inf->modes->bpp)
 309                         return -EINVAL;
 310         }
 311
 312         var->xres_virtual =
 313                 max(var->xres_virtual, var->xres);
 314         var->yres_virtual =
 315                 max(var->yres_virtual, var->yres);
 316
 317         /*
 318          * Setup the RGB parameters for this display.
 319          *
 320          * The pixel packing format is described on page 7-11 of the
 321          * PXA2XX Developer's Manual.
 322          */
 323         if (var->bits_per_pixel == 16) {
 324                 var->red.offset   = 11; var->red.length   = 5;
 325                 var->green.offset = 5;  var->green.length = 6;
 326                 var->blue.offset  = 0;  var->blue.length  = 5;
 327                 var->transp.offset = var->transp.length = 0;
 328         } else {
 329                 var->red.offset = var->green.offset = var->blue.offset = var->transp.offset = 0;
 330                 var->red.length   = 8;
 331                 var->green.length = 8;
 332                 var->blue.length  = 8;
 333                 var->transp.length = 0;
 334         }
 335
 336 #ifdef CONFIG_CPU_FREQ
 337         pr_debug("pxafb: dma period = %d ps, clock = %d kHz\n",
 338                  pxafb_display_dma_period(var),
 339                  get_clk_frequency_khz(0));
 340 #endif
 341
 342         return 0;
 343 }
 344
 345 static inline void pxafb_set_truecolor(u_int is_true_color)
 346 {
 347         pr_debug("pxafb: true_color = %d\n", is_true_color);
 348         // do your machine-specific setup if needed
 349 }
 350
 351 /*
 352  * pxafb_set_par():
 353  *      Set the user defined part of the display for the specified console
 354  */
 355 static int pxafb_set_par(struct fb_info *info)
 356 {
 357         struct pxafb_info *fbi = (struct pxafb_info *)info;
 358         struct fb_var_screeninfo *var = &info->var;
 359         unsigned long palette_mem_size;
 360
 361         pr_debug("pxafb: set_par\n");
 362
 363         if (var->bits_per_pixel == 16)
 364                 fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
 365         else if (!fbi->cmap_static)
 366                 fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
 367         else {
 368                 /*
 369                  * Some people have weird ideas about wanting static
 370                  * pseudocolor maps.  I suspect their user space
 371                  * applications are broken.
 372                  */
 373                 fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 374         }
 375
 376         fbi->fb.fix.line_length = var->xres_virtual *
 377                                   var->bits_per_pixel / 8;
 378         if (var->bits_per_pixel == 16)
 379                 fbi->palette_size = 0;
 380         else
 381                 fbi->palette_size = var->bits_per_pixel == 1 ? 4 : 1 << var->bits_per_pixel;
 382
 383         if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
 384                 palette_mem_size = fbi->palette_size * sizeof(u16);
 385         else
 386                 palette_mem_size = fbi->palette_size * sizeof(u32);
 387
 388         pr_debug("pxafb: palette_mem_size = 0x%08lx\n", palette_mem_size);
 389
 390         fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
 391         fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
 392
 393         /*
 394          * Set (any) board control register to handle new color depth
 395          */
 396         pxafb_set_truecolor(fbi->fb.fix.visual == FB_VISUAL_TRUECOLOR);
 397
 398         if (fbi->fb.var.bits_per_pixel == 16)
 399                 fb_dealloc_cmap(&fbi->fb.cmap);
 400         else
 401                 fb_alloc_cmap(&fbi->fb.cmap, 1<<fbi->fb.var.bits_per_pixel, 0);
 402
 403         pxafb_activate_var(var, fbi);
 404
 405         return 0;
 406 }
 407
 408 /*
 409  * Formal definition of the VESA spec:
 410  *  On
 411  *      This refers to the state of the display when it is in full operation
 412  *  Stand-By
 413  *      This defines an optional operating state of minimal power reduction with
 414  *      the shortest recovery time
 415  *  Suspend
 416  *      This refers to a level of power management in which substantial power
 417  *      reduction is achieved by the display.  The display can have a longer
 418  *      recovery time from this state than from the Stand-by state
 419  *  Off
 420  *      This indicates that the display is consuming the lowest level of power
 421  *      and is non-operational. Recovery from this state may optionally require
 422  *      the user to manually power on the monitor
 423  *
 424  *  Now, the fbdev driver adds an additional state, (blank), where they
 425  *  turn off the video (maybe by colormap tricks), but don't mess with the
 426  *  video itself: think of it semantically between on and Stand-By.
 427  *
 428  *  So here's what we should do in our fbdev blank routine:
 429  *
 430  *      VESA_NO_BLANKING (mode 0)       Video on,  front/back light on
 431  *      VESA_VSYNC_SUSPEND (mode 1)     Video on,  front/back light off
 432  *      VESA_HSYNC_SUSPEND (mode 2)     Video on,  front/back light off
 433  *      VESA_POWERDOWN (mode 3)         Video off, front/back light off
 434  *
 435  *  This will match the matrox implementation.
 436  */
 437
 438 /*
 439  * pxafb_blank():
 440  *      Blank the display by setting all palette values to zero.  Note, the
 441  *      16 bpp mode does not really use the palette, so this will not
 442  *      blank the display in all modes.
 443  */
 444 static int pxafb_blank(int blank, struct fb_info *info)
 445 {
 446         struct pxafb_info *fbi = (struct pxafb_info *)info;
 447         int i;
 448
 449         pr_debug("pxafb: blank=%d\n", blank);
 450
 451         switch (blank) {
 452         case FB_BLANK_POWERDOWN:
 453         case FB_BLANK_VSYNC_SUSPEND:
 454         case FB_BLANK_HSYNC_SUSPEND:
 455         case FB_BLANK_NORMAL:
 456                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 457                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 458                         for (i = 0; i < fbi->palette_size; i++)
 459                                 pxafb_setpalettereg(i, 0, 0, 0, 0, info);
 460
 461                 pxafb_schedule_work(fbi, C_DISABLE);
 462                 //TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
 463                 break;
 464
 465         case FB_BLANK_UNBLANK:
 466                 //TODO if (pxafb_blank_helper) pxafb_blank_helper(blank);
 467                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 468                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 469                         fb_set_cmap(&fbi->fb.cmap, info);
 470                 pxafb_schedule_work(fbi, C_ENABLE);
 471         }
 472         return 0;
 473 }
 474
 475 static int pxafb_mmap(struct fb_info *info,
 476                       struct vm_area_struct *vma)
 477 {
 478         struct pxafb_info *fbi = (struct pxafb_info *)info;
 479         unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
 480
 481         if (off < info->fix.smem_len) {
 482                 vma->vm_pgoff += 1;
 483                 return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
 484                                              fbi->map_dma, fbi->map_size);
 485         }
 486         return -EINVAL;
 487 }
 488
 489 static struct fb_ops pxafb_ops = {
 490         .owner          = THIS_MODULE,
 491         .fb_check_var   = pxafb_check_var,
 492         .fb_set_par     = pxafb_set_par,
 493         .fb_setcolreg   = pxafb_setcolreg,
 494         .fb_fillrect    = cfb_fillrect,
 495         .fb_copyarea    = cfb_copyarea,
 496         .fb_imageblit   = cfb_imageblit,
 497         .fb_blank       = pxafb_blank,
 498         .fb_mmap        = pxafb_mmap,
 499 };
 500
 501 /*
 502  * Calculate the PCD value from the clock rate (in picoseconds).
 503  * We take account of the PPCR clock setting.
 504  * From PXA Developer's Manual:
 505  *
 506  *   PixelClock =      LCLK
 507  *                -------------
 508  *                2 ( PCD + 1 )
 509  *
 510  *   PCD =      LCLK
 511  *         ------------- - 1
 512  *         2(PixelClock)
 513  *
 514  * Where:
 515  *   LCLK = LCD/Memory Clock
 516  *   PCD = LCCR3[7:0]
 517  *
 518  * PixelClock here is in Hz while the pixclock argument given is the
 519  * period in picoseconds. Hence PixelClock = 1 / ( pixclock * 10^-12 )
 520  *
 521  * The function get_lclk_frequency_10khz returns LCLK in units of
 522  * 10khz. Calling the result of this function lclk gives us the
 523  * following
 524  *
 525  *    PCD = (lclk * 10^4 ) * ( pixclock * 10^-12 )
 526  *          -------------------------------------- - 1
 527  *                          2
 528  *
 529  * Factoring the 10^4 and 10^-12 out gives 10^-8 == 1 / 100000000 as used below.
 530  */
 531 static inline unsigned int get_pcd(struct pxafb_info *fbi, unsigned int pixclock)
 532 {
 533         unsigned long long pcd;
 534
 535         /* FIXME: Need to take into account Double Pixel Clock mode
 536          * (DPC) bit? or perhaps set it based on the various clock
 537          * speeds */
 538         pcd = (unsigned long long)(clk_get_rate(fbi->clk) / 10000);
 539         pcd *= pixclock;
 540         do_div(pcd, 100000000 * 2);
 541         /* no need for this, since we should subtract 1 anyway. they cancel */
 542         /* pcd += 1; */ /* make up for integer math truncations */
 543         return (unsigned int)pcd;
 544 }
 545
 546 /*
 547  * Some touchscreens need hsync information from the video driver to
 548  * function correctly. We export it here.  Note that 'hsync_time' and
 549  * the value returned from pxafb_get_hsync_time() is the *reciprocal*
 550  * of the hsync period in seconds.
 551  */
 552 static inline void set_hsync_time(struct pxafb_info *fbi, unsigned int pcd)
 553 {
 554         unsigned long htime;
 555
 556         if ((pcd == 0) || (fbi->fb.var.hsync_len == 0)) {
 557                 fbi->hsync_time=0;
 558                 return;
 559         }
 560
 561         htime = clk_get_rate(fbi->clk) / (pcd * fbi->fb.var.hsync_len);
 562
 563         fbi->hsync_time = htime;
 564 }
 565
 566 unsigned long pxafb_get_hsync_time(struct device *dev)
 567 {
 568         struct pxafb_info *fbi = dev_get_drvdata(dev);
 569
 570         /* If display is blanked/suspended, hsync isn't active */
 571         if (!fbi || (fbi->state != C_ENABLE))
 572                 return 0;
 573
 574         return fbi->hsync_time;
 575 }
 576 EXPORT_SYMBOL(pxafb_get_hsync_time);
 577
 578 /*
 579  * pxafb_activate_var():
 580  *      Configures LCD Controller based on entries in var parameter.  Settings are
 581  *      only written to the controller if changes were made.
 582  */
 583 static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *fbi)
 584 {
 585         struct pxafb_lcd_reg new_regs;
 586         u_long flags;
 587         u_int lines_per_panel, pcd = get_pcd(fbi, var->pixclock);
 588
 589         pr_debug("pxafb: Configuring PXA LCD\n");
 590
 591         pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n",
 592                  var->xres, var->hsync_len,
 593                  var->left_margin, var->right_margin);
 594         pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n",
 595                  var->yres, var->vsync_len,
 596                  var->upper_margin, var->lower_margin);
 597         pr_debug("var: pixclock=%d pcd=%d\n", var->pixclock, pcd);
 598
 599 #if DEBUG_VAR
 600         if (var->xres < 16        || var->xres > 1024)
 601                 printk(KERN_ERR "%s: invalid xres %d\n",
 602                         fbi->fb.fix.id, var->xres);
 603         switch(var->bits_per_pixel) {
 604         case 1:
 605         case 2:
 606         case 4:
 607         case 8:
 608         case 16:
 609                 break;
 610         default:
 611                 printk(KERN_ERR "%s: invalid bit depth %d\n",
 612                        fbi->fb.fix.id, var->bits_per_pixel);
 613                 break;
 614         }
 615         if (var->hsync_len < 1    || var->hsync_len > 64)
 616                 printk(KERN_ERR "%s: invalid hsync_len %d\n",
 617                         fbi->fb.fix.id, var->hsync_len);
 618         if (var->left_margin < 1  || var->left_margin > 255)
 619                 printk(KERN_ERR "%s: invalid left_margin %d\n",
 620                         fbi->fb.fix.id, var->left_margin);
 621         if (var->right_margin < 1 || var->right_margin > 255)
 622                 printk(KERN_ERR "%s: invalid right_margin %d\n",
 623                         fbi->fb.fix.id, var->right_margin);
 624         if (var->yres < 1         || var->yres > 1024)
 625                 printk(KERN_ERR "%s: invalid yres %d\n",
 626                         fbi->fb.fix.id, var->yres);
 627         if (var->vsync_len < 1    || var->vsync_len > 64)
 628                 printk(KERN_ERR "%s: invalid vsync_len %d\n",
 629                         fbi->fb.fix.id, var->vsync_len);
 630         if (var->upper_margin < 0 || var->upper_margin > 255)
 631                 printk(KERN_ERR "%s: invalid upper_margin %d\n",
 632                         fbi->fb.fix.id, var->upper_margin);
 633         if (var->lower_margin < 0 || var->lower_margin > 255)
 634                 printk(KERN_ERR "%s: invalid lower_margin %d\n",
 635                         fbi->fb.fix.id, var->lower_margin);
 636 #endif
 637
 638         new_regs.lccr0 = fbi->lccr0 |
 639                 (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM |
 640                  LCCR0_QDM | LCCR0_BM  | LCCR0_OUM);
 641
 642         new_regs.lccr1 =
 643                 LCCR1_DisWdth(var->xres) +
 644                 LCCR1_HorSnchWdth(var->hsync_len) +
 645                 LCCR1_BegLnDel(var->left_margin) +
 646                 LCCR1_EndLnDel(var->right_margin);
 647
 648         /*
 649          * If we have a dual scan LCD, we need to halve
 650          * the YRES parameter.
 651          */
 652         lines_per_panel = var->yres;
 653         if ((fbi->lccr0 & LCCR0_SDS) == LCCR0_Dual)
 654                 lines_per_panel /= 2;
 655
 656         new_regs.lccr2 =
 657                 LCCR2_DisHght(lines_per_panel) +
 658                 LCCR2_VrtSnchWdth(var->vsync_len) +
 659                 LCCR2_BegFrmDel(var->upper_margin) +
 660                 LCCR2_EndFrmDel(var->lower_margin);
 661
 662         new_regs.lccr3 = fbi->lccr3 |
 663                 pxafb_bpp_to_lccr3(var) |
 664                 (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
 665                 (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);
 666
 667         if (pcd)
 668                 new_regs.lccr3 |= LCCR3_PixClkDiv(pcd);
 669
 670         pr_debug("nlccr0 = 0x%08x\n", new_regs.lccr0);
 671         pr_debug("nlccr1 = 0x%08x\n", new_regs.lccr1);
 672         pr_debug("nlccr2 = 0x%08x\n", new_regs.lccr2);
 673         pr_debug("nlccr3 = 0x%08x\n", new_regs.lccr3);
 674
 675         /* Update shadow copy atomically */
 676         local_irq_save(flags);
 677
 678         /* setup dma descriptors */
 679         fbi->dmadesc_fblow_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 3*16);
 680         fbi->dmadesc_fbhigh_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 2*16);
 681         fbi->dmadesc_palette_cpu = (struct pxafb_dma_descriptor *)((unsigned int)fbi->palette_cpu - 1*16);
 682
 683         fbi->dmadesc_fblow_dma = fbi->palette_dma - 3*16;
 684         fbi->dmadesc_fbhigh_dma = fbi->palette_dma - 2*16;
 685         fbi->dmadesc_palette_dma = fbi->palette_dma - 1*16;
 686
 687 #define BYTES_PER_PANEL (lines_per_panel * fbi->fb.fix.line_length)
 688
 689         /* populate descriptors */
 690         fbi->dmadesc_fblow_cpu->fdadr = fbi->dmadesc_fblow_dma;
 691         fbi->dmadesc_fblow_cpu->fsadr = fbi->screen_dma + BYTES_PER_PANEL;
 692         fbi->dmadesc_fblow_cpu->fidr  = 0;
 693         fbi->dmadesc_fblow_cpu->ldcmd = BYTES_PER_PANEL;
 694
 695         fbi->fdadr1 = fbi->dmadesc_fblow_dma; /* only used in dual-panel mode */
 696
 697         fbi->dmadesc_fbhigh_cpu->fsadr = fbi->screen_dma;
 698         fbi->dmadesc_fbhigh_cpu->fidr = 0;
 699         fbi->dmadesc_fbhigh_cpu->ldcmd = BYTES_PER_PANEL;
 700
 701         fbi->dmadesc_palette_cpu->fsadr = fbi->palette_dma;
 702         fbi->dmadesc_palette_cpu->fidr  = 0;
 703         if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
 704                 fbi->dmadesc_palette_cpu->ldcmd = fbi->palette_size *
 705                                                         sizeof(u16);
 706         else
 707                 fbi->dmadesc_palette_cpu->ldcmd = fbi->palette_size *
 708                                                         sizeof(u32);
 709         fbi->dmadesc_palette_cpu->ldcmd |= LDCMD_PAL;
 710
 711         if (var->bits_per_pixel == 16) {
 712                 /* palette shouldn't be loaded in true-color mode */
 713                 fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
 714                 fbi->fdadr0 = fbi->dmadesc_fbhigh_dma; /* no pal just fbhigh */
 715                 /* init it to something, even though we won't be using it */
 716                 fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_palette_dma;
 717         } else {
 718                 fbi->dmadesc_palette_cpu->fdadr = fbi->dmadesc_fbhigh_dma;
 719                 fbi->dmadesc_fbhigh_cpu->fdadr = fbi->dmadesc_palette_dma;
 720                 fbi->fdadr0 = fbi->dmadesc_palette_dma; /* flips back and forth between pal and fbhigh */
 721         }
 722
 723 #if 0
 724         pr_debug("fbi->dmadesc_fblow_cpu = 0x%p\n", fbi->dmadesc_fblow_cpu);
 725         pr_debug("fbi->dmadesc_fbhigh_cpu = 0x%p\n", fbi->dmadesc_fbhigh_cpu);
 726         pr_debug("fbi->dmadesc_palette_cpu = 0x%p\n", fbi->dmadesc_palette_cpu);
 727         pr_debug("fbi->dmadesc_fblow_dma = 0x%x\n", fbi->dmadesc_fblow_dma);
 728         pr_debug("fbi->dmadesc_fbhigh_dma = 0x%x\n", fbi->dmadesc_fbhigh_dma);
 729         pr_debug("fbi->dmadesc_palette_dma = 0x%x\n", fbi->dmadesc_palette_dma);
 730
 731         pr_debug("fbi->dmadesc_fblow_cpu->fdadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fdadr);
 732         pr_debug("fbi->dmadesc_fbhigh_cpu->fdadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fdadr);
 733         pr_debug("fbi->dmadesc_palette_cpu->fdadr = 0x%x\n", fbi->dmadesc_palette_cpu->fdadr);
 734
 735         pr_debug("fbi->dmadesc_fblow_cpu->fsadr = 0x%x\n", fbi->dmadesc_fblow_cpu->fsadr);
 736         pr_debug("fbi->dmadesc_fbhigh_cpu->fsadr = 0x%x\n", fbi->dmadesc_fbhigh_cpu->fsadr);
 737         pr_debug("fbi->dmadesc_palette_cpu->fsadr = 0x%x\n", fbi->dmadesc_palette_cpu->fsadr);
 738
 739         pr_debug("fbi->dmadesc_fblow_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fblow_cpu->ldcmd);
 740         pr_debug("fbi->dmadesc_fbhigh_cpu->ldcmd = 0x%x\n", fbi->dmadesc_fbhigh_cpu->ldcmd);
 741         pr_debug("fbi->dmadesc_palette_cpu->ldcmd = 0x%x\n", fbi->dmadesc_palette_cpu->ldcmd);
 742 #endif
 743
 744         fbi->reg_lccr0 = new_regs.lccr0;
 745         fbi->reg_lccr1 = new_regs.lccr1;
 746         fbi->reg_lccr2 = new_regs.lccr2;
 747         fbi->reg_lccr3 = new_regs.lccr3;
 748         fbi->reg_lccr4 = LCCR4 & (~LCCR4_PAL_FOR_MASK);
 749         fbi->reg_lccr4 |= (fbi->lccr4 & LCCR4_PAL_FOR_MASK);
 750         set_hsync_time(fbi, pcd);
 751         local_irq_restore(flags);
 752
 753         /*
 754          * Only update the registers if the controller is enabled
 755          * and something has changed.
 756          */
 757         if ((LCCR0  != fbi->reg_lccr0) || (LCCR1  != fbi->reg_lccr1) ||
 758             (LCCR2  != fbi->reg_lccr2) || (LCCR3  != fbi->reg_lccr3) ||
 759             (FDADR0 != fbi->fdadr0)    || (FDADR1 != fbi->fdadr1))
 760                 pxafb_schedule_work(fbi, C_REENABLE);
 761
 762         return 0;
 763 }
 764
 765 /*
 766  * NOTE!  The following functions are purely helpers for set_ctrlr_state.
 767  * Do not call them directly; set_ctrlr_state does the correct serialisation
 768  * to ensure that things happen in the right way 100% of time time.
 769  *      -- rmk
 770  */
 771 static inline void __pxafb_backlight_power(struct pxafb_info *fbi, int on)
 772 {
 773         pr_debug("pxafb: backlight o%s\n", on ? "n" : "ff");
 774
 775         if (pxafb_backlight_power)
 776                 pxafb_backlight_power(on);
 777 }
 778
 779 static inline void __pxafb_lcd_power(struct pxafb_info *fbi, int on)
 780 {
 781         pr_debug("pxafb: LCD power o%s\n", on ? "n" : "ff");
 782
 783         if (pxafb_lcd_power)
 784                 pxafb_lcd_power(on, &fbi->fb.var);
 785 }
 786
 787 static void pxafb_setup_gpio(struct pxafb_info *fbi)
 788 {
 789         int gpio, ldd_bits;
 790         unsigned int lccr0 = fbi->lccr0;
 791
 792         /*
 793          * setup is based on type of panel supported
 794         */
 795
 796         /* 4 bit interface */
 797         if ((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
 798             (lccr0 & LCCR0_SDS) == LCCR0_Sngl &&
 799             (lccr0 & LCCR0_DPD) == LCCR0_4PixMono)
 800                 ldd_bits = 4;
 801
 802         /* 8 bit interface */
 803         else if (((lccr0 & LCCR0_CMS) == LCCR0_Mono &&
 804                   ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_DPD) == LCCR0_8PixMono)) ||
 805                  ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
 806                   (lccr0 & LCCR0_PAS) == LCCR0_Pas && (lccr0 & LCCR0_SDS) == LCCR0_Sngl))
 807                 ldd_bits = 8;
 808
 809         /* 16 bit interface */
 810         else if ((lccr0 & LCCR0_CMS) == LCCR0_Color &&
 811                  ((lccr0 & LCCR0_SDS) == LCCR0_Dual || (lccr0 & LCCR0_PAS) == LCCR0_Act))
 812                 ldd_bits = 16;
 813
 814         else {
 815                 printk(KERN_ERR "pxafb_setup_gpio: unable to determine bits per pixel\n");
 816                 return;
 817         }
 818
 819         for (gpio = 58; ldd_bits; gpio++, ldd_bits--)
 820                 pxa_gpio_mode(gpio | GPIO_ALT_FN_2_OUT);
 821         pxa_gpio_mode(GPIO74_LCD_FCLK_MD);
 822         pxa_gpio_mode(GPIO75_LCD_LCLK_MD);
 823         pxa_gpio_mode(GPIO76_LCD_PCLK_MD);
 824         pxa_gpio_mode(GPIO77_LCD_ACBIAS_MD);
 825 }
 826
 827 static void pxafb_enable_controller(struct pxafb_info *fbi)
 828 {
 829         pr_debug("pxafb: Enabling LCD controller\n");
 830         pr_debug("fdadr0 0x%08x\n", (unsigned int) fbi->fdadr0);
 831         pr_debug("fdadr1 0x%08x\n", (unsigned int) fbi->fdadr1);
 832         pr_debug("reg_lccr0 0x%08x\n", (unsigned int) fbi->reg_lccr0);
 833         pr_debug("reg_lccr1 0x%08x\n", (unsigned int) fbi->reg_lccr1);
 834         pr_debug("reg_lccr2 0x%08x\n", (unsigned int) fbi->reg_lccr2);
 835         pr_debug("reg_lccr3 0x%08x\n", (unsigned int) fbi->reg_lccr3);
 836
 837         /* enable LCD controller clock */
 838         clk_enable(fbi->clk);
 839
 840         /* Sequence from 11.7.10 */
 841         LCCR3 = fbi->reg_lccr3;
 842         LCCR2 = fbi->reg_lccr2;
 843         LCCR1 = fbi->reg_lccr1;
 844         LCCR0 = fbi->reg_lccr0 & ~LCCR0_ENB;
 845
 846         FDADR0 = fbi->fdadr0;
 847         FDADR1 = fbi->fdadr1;
 848         LCCR0 |= LCCR0_ENB;
 849
 850         pr_debug("FDADR0 0x%08x\n", (unsigned int) FDADR0);
 851         pr_debug("FDADR1 0x%08x\n", (unsigned int) FDADR1);
 852         pr_debug("LCCR0 0x%08x\n", (unsigned int) LCCR0);
 853         pr_debug("LCCR1 0x%08x\n", (unsigned int) LCCR1);
 854         pr_debug("LCCR2 0x%08x\n", (unsigned int) LCCR2);
 855         pr_debug("LCCR3 0x%08x\n", (unsigned int) LCCR3);
 856         pr_debug("LCCR4 0x%08x\n", (unsigned int) LCCR4);
 857 }
 858
 859 static void pxafb_disable_controller(struct pxafb_info *fbi)
 860 {
 861         DECLARE_WAITQUEUE(wait, current);
 862
 863         pr_debug("pxafb: disabling LCD controller\n");
 864
 865         set_current_state(TASK_UNINTERRUPTIBLE);
 866         add_wait_queue(&fbi->ctrlr_wait, &wait);
 867
 868         LCSR = 0xffffffff;      /* Clear LCD Status Register */
 869         LCCR0 &= ~LCCR0_LDM;    /* Enable LCD Disable Done Interrupt */
 870         LCCR0 |= LCCR0_DIS;     /* Disable LCD Controller */
 871
 872         schedule_timeout(200 * HZ / 1000);
 873         remove_wait_queue(&fbi->ctrlr_wait, &wait);
 874
 875         /* disable LCD controller clock */
 876         clk_disable(fbi->clk);
 877 }
 878
 879 /*
 880  *  pxafb_handle_irq: Handle 'LCD DONE' interrupts.
 881  */
 882 static irqreturn_t pxafb_handle_irq(int irq, void *dev_id)
 883 {
 884         struct pxafb_info *fbi = dev_id;
 885         unsigned int lcsr = LCSR;
 886
 887         if (lcsr & LCSR_LDD) {
 888                 LCCR0 |= LCCR0_LDM;
 889                 wake_up(&fbi->ctrlr_wait);
 890         }
 891
 892         LCSR = lcsr;
 893         return IRQ_HANDLED;
 894 }
 895
 896 /*
 897  * This function must be called from task context only, since it will
 898  * sleep when disabling the LCD controller, or if we get two contending
 899  * processes trying to alter state.
 900  */
 901 static void set_ctrlr_state(struct pxafb_info *fbi, u_int state)
 902 {
 903         u_int old_state;
 904
 905         down(&fbi->ctrlr_sem);
 906
 907         old_state = fbi->state;
 908
 909         /*
 910          * Hack around fbcon initialisation.
 911          */
 912         if (old_state == C_STARTUP && state == C_REENABLE)
 913                 state = C_ENABLE;
 914
 915         switch (state) {
 916         case C_DISABLE_CLKCHANGE:
 917                 /*
 918                  * Disable controller for clock change.  If the
 919                  * controller is already disabled, then do nothing.
 920                  */
 921                 if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
 922                         fbi->state = state;
 923                         //TODO __pxafb_lcd_power(fbi, 0);
 924                         pxafb_disable_controller(fbi);
 925                 }
 926                 break;
 927
 928         case C_DISABLE_PM:
 929         case C_DISABLE:
 930                 /*
 931                  * Disable controller
 932                  */
 933                 if (old_state != C_DISABLE) {
 934                         fbi->state = state;
 935                         __pxafb_backlight_power(fbi, 0);
 936                         __pxafb_lcd_power(fbi, 0);
 937                         if (old_state != C_DISABLE_CLKCHANGE)
 938                                 pxafb_disable_controller(fbi);
 939                 }
 940                 break;
 941
 942         case C_ENABLE_CLKCHANGE:
 943                 /*
 944                  * Enable the controller after clock change.  Only
 945                  * do this if we were disabled for the clock change.
 946                  */
 947                 if (old_state == C_DISABLE_CLKCHANGE) {
 948                         fbi->state = C_ENABLE;
 949                         pxafb_enable_controller(fbi);
 950                         //TODO __pxafb_lcd_power(fbi, 1);
 951                 }
 952                 break;
 953
 954         case C_REENABLE:
 955                 /*
 956                  * Re-enable the controller only if it was already
 957                  * enabled.  This is so we reprogram the control
 958                  * registers.
 959                  */
 960                 if (old_state == C_ENABLE) {
 961                         __pxafb_lcd_power(fbi, 0);
 962                         pxafb_disable_controller(fbi);
 963                         pxafb_setup_gpio(fbi);
 964                         pxafb_enable_controller(fbi);
 965                         __pxafb_lcd_power(fbi, 1);
 966                 }
 967                 break;
 968
 969         case C_ENABLE_PM:
 970                 /*
 971                  * Re-enable the controller after PM.  This is not
 972                  * perfect - think about the case where we were doing
 973                  * a clock change, and we suspended half-way through.
 974                  */
 975                 if (old_state != C_DISABLE_PM)
 976                         break;
 977                 /* fall through */
 978
 979         case C_ENABLE:
 980                 /*
 981                  * Power up the LCD screen, enable controller, and
 982                  * turn on the backlight.
 983                  */
 984                 if (old_state != C_ENABLE) {
 985                         fbi->state = C_ENABLE;
 986                         pxafb_setup_gpio(fbi);
 987                         pxafb_enable_controller(fbi);
 988                         __pxafb_lcd_power(fbi, 1);
 989                         __pxafb_backlight_power(fbi, 1);
 990                 }
 991                 break;
 992         }
 993         up(&fbi->ctrlr_sem);
 994 }
 995
 996 /*
 997  * Our LCD controller task (which is called when we blank or unblank)
 998  * via keventd.
 999  */
1000 static void pxafb_task(struct work_struct *work)
1001 {
1002         struct pxafb_info *fbi =
1003                 container_of(work, struct pxafb_info, task);
1004         u_int state = xchg(&fbi->task_state, -1);
1005
1006         set_ctrlr_state(fbi, state);
1007 }
1008
1009 #ifdef CONFIG_CPU_FREQ
1010 /*
1011  * CPU clock speed change handler.  We need to adjust the LCD timing
1012  * parameters when the CPU clock is adjusted by the power management
1013  * subsystem.
1014  *
1015  * TODO: Determine why f->new != 10*get_lclk_frequency_10khz()
1016  */
1017 static int
1018 pxafb_freq_transition(struct notifier_block *nb, unsigned long val, void *data)
1019 {
1020         struct pxafb_info *fbi = TO_INF(nb, freq_transition);
1021         //TODO struct cpufreq_freqs *f = data;
1022         u_int pcd;
1023
1024         switch (val) {
1025         case CPUFREQ_PRECHANGE:
1026                 set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
1027                 break;
1028
1029         case CPUFREQ_POSTCHANGE:
1030                 pcd = get_pcd(fbi, fbi->fb.var.pixclock);
1031                 set_hsync_time(fbi, pcd);
1032                 fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
1033                 set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
1034                 break;
1035         }
1036         return 0;
1037 }
1038
1039 static int
1040 pxafb_freq_policy(struct notifier_block *nb, unsigned long val, void *data)
1041 {
1042         struct pxafb_info *fbi = TO_INF(nb, freq_policy);
1043         struct fb_var_screeninfo *var = &fbi->fb.var;
1044         struct cpufreq_policy *policy = data;
1045
1046         switch (val) {
1047         case CPUFREQ_ADJUST:
1048         case CPUFREQ_INCOMPATIBLE:
1049                 pr_debug("min dma period: %d ps, "
1050                         "new clock %d kHz\n", pxafb_display_dma_period(var),
1051                         policy->max);
1052                 // TODO: fill in min/max values
1053                 break;
1054 #if 0
1055         case CPUFREQ_NOTIFY:
1056                 printk(KERN_ERR "%s: got CPUFREQ_NOTIFY\n", __FUNCTION__);
1057                 do {} while(0);
1058                 /* todo: panic if min/max values aren't fulfilled
1059                  * [can't really happen unless there's a bug in the
1060                  * CPU policy verification process *
1061                  */
1062                 break;
1063 #endif
1064         }
1065         return 0;
1066 }
1067 #endif
1068
1069 #ifdef CONFIG_PM
1070 /*
1071  * Power management hooks.  Note that we won't be called from IRQ context,
1072  * unlike the blank functions above, so we may sleep.
1073  */
1074 static int pxafb_suspend(struct platform_device *dev, pm_message_t state)
1075 {
1076         struct pxafb_info *fbi = platform_get_drvdata(dev);
1077
1078         set_ctrlr_state(fbi, C_DISABLE_PM);
1079         return 0;
1080 }
1081
1082 static int pxafb_resume(struct platform_device *dev)
1083 {
1084         struct pxafb_info *fbi = platform_get_drvdata(dev);
1085
1086         set_ctrlr_state(fbi, C_ENABLE_PM);
1087         return 0;
1088 }
1089 #else
1090 #define pxafb_suspend   NULL
1091 #define pxafb_resume    NULL
1092 #endif
1093
1094 /*
1095  * pxafb_map_video_memory():
1096  *      Allocates the DRAM memory for the frame buffer.  This buffer is
1097  *      remapped into a non-cached, non-buffered, memory region to
1098  *      allow palette and pixel writes to occur without flushing the
1099  *      cache.  Once this area is remapped, all virtual memory
1100  *      access to the video memory should occur at the new region.
1101  */
1102 static int __init pxafb_map_video_memory(struct pxafb_info *fbi)
1103 {
1104         u_long palette_mem_size;
1105
1106         /*
1107          * We reserve one page for the palette, plus the size
1108          * of the framebuffer.
1109          */
1110         fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
1111         fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
1112                                               &fbi->map_dma, GFP_KERNEL);
1113
1114         if (fbi->map_cpu) {
1115                 /* prevent initial garbage on screen */
1116                 memset(fbi->map_cpu, 0, fbi->map_size);
1117                 fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
1118                 fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
1119                 /*
1120                  * FIXME: this is actually the wrong thing to place in
1121                  * smem_start.  But fbdev suffers from the problem that
1122                  * it needs an API which doesn't exist (in this case,
1123                  * dma_writecombine_mmap)
1124                  */
1125                 fbi->fb.fix.smem_start = fbi->screen_dma;
1126                 fbi->palette_size = fbi->fb.var.bits_per_pixel == 8 ? 256 : 16;
1127
1128                 if ((fbi->lccr4 & LCCR4_PAL_FOR_MASK) == LCCR4_PAL_FOR_0)
1129                         palette_mem_size = fbi->palette_size * sizeof(u16);
1130                 else
1131                         palette_mem_size = fbi->palette_size * sizeof(u32);
1132
1133                 pr_debug("pxafb: palette_mem_size = 0x%08lx\n", palette_mem_size);
1134
1135                 fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
1136                 fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
1137         }
1138
1139         return fbi->map_cpu ? 0 : -ENOMEM;
1140 }
1141
1142 static struct pxafb_info * __init pxafb_init_fbinfo(struct device *dev)
1143 {
1144         struct pxafb_info *fbi;
1145         void *addr;
1146         struct pxafb_mach_info *inf = dev->platform_data;
1147         struct pxafb_mode_info *mode = inf->modes;
1148         int i, smemlen;
1149
1150         /* Alloc the pxafb_info and pseudo_palette in one step */
1151         fbi = kmalloc(sizeof(struct pxafb_info) + sizeof(u32) * 16, GFP_KERNEL);
1152         if (!fbi)
1153                 return NULL;
1154
1155         memset(fbi, 0, sizeof(struct pxafb_info));
1156         fbi->dev = dev;
1157
1158         fbi->clk = clk_get(dev, "LCDCLK");
1159         if (IS_ERR(fbi->clk)) {
1160                 kfree(fbi);
1161                 return NULL;
1162         }
1163
1164         strcpy(fbi->fb.fix.id, PXA_NAME);
1165
1166         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
1167         fbi->fb.fix.type_aux    = 0;
1168         fbi->fb.fix.xpanstep    = 0;
1169         fbi->fb.fix.ypanstep    = 0;
1170         fbi->fb.fix.ywrapstep   = 0;
1171         fbi->fb.fix.accel       = FB_ACCEL_NONE;
1172
1173         fbi->fb.var.nonstd      = 0;
1174         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
1175         fbi->fb.var.height      = -1;
1176         fbi->fb.var.width       = -1;
1177         fbi->fb.var.accel_flags = 0;
1178         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
1179
1180         fbi->fb.fbops           = &pxafb_ops;
1181         fbi->fb.flags           = FBINFO_DEFAULT;
1182         fbi->fb.node            = -1;
1183
1184         addr = fbi;
1185         addr = addr + sizeof(struct pxafb_info);
1186         fbi->fb.pseudo_palette  = addr;
1187
1188         pxafb_setmode(&fbi->fb.var, mode);
1189
1190         fbi->cmap_inverse               = inf->cmap_inverse;
1191         fbi->cmap_static                = inf->cmap_static;
1192
1193         fbi->lccr0                      = inf->lccr0;
1194         fbi->lccr3                      = inf->lccr3;
1195         fbi->lccr4                      = inf->lccr4;
1196         fbi->state                      = C_STARTUP;
1197         fbi->task_state                 = (u_char)-1;
1198
1199         for (i = 0; i < inf->num_modes; i++) {
1200                 smemlen = mode[i].xres * mode[i].yres * mode[i].bpp / 8;
1201                 if (smemlen > fbi->fb.fix.smem_len)
1202                         fbi->fb.fix.smem_len = smemlen;
1203         }
1204
1205         init_waitqueue_head(&fbi->ctrlr_wait);
1206         INIT_WORK(&fbi->task, pxafb_task);
1207         init_MUTEX(&fbi->ctrlr_sem);
1208
1209         return fbi;
1210 }
1211
1212 #ifdef CONFIG_FB_PXA_PARAMETERS
1213 static int __init pxafb_parse_options(struct device *dev, char *options)
1214 {
1215         struct pxafb_mach_info *inf = dev->platform_data;
1216         char *this_opt;
1217
1218         if (!options || !*options)
1219                 return 0;
1220
1221         dev_dbg(dev, "options are \"%s\"\n", options ? options : "null");
1222
1223         /* could be made table driven or similar?... */
1224         while ((this_opt = strsep(&options, ",")) != NULL) {
1225                 if (!strncmp(this_opt, "mode:", 5)) {
1226                         const char *name = this_opt+5;
1227                         unsigned int namelen = strlen(name);
1228                         int res_specified = 0, bpp_specified = 0;
1229                         unsigned int xres = 0, yres = 0, bpp = 0;
1230                         int yres_specified = 0;
1231                         int i;
1232                         for (i = namelen-1; i >= 0; i--) {
1233                                 switch (name[i]) {
1234                                 case '-':
1235                                         namelen = i;
1236                                         if (!bpp_specified && !yres_specified) {
1237                                                 bpp = simple_strtoul(&name[i+1], NULL, 0);
1238                                                 bpp_specified = 1;
1239                                         } else
1240                                                 goto done;
1241                                         break;
1242                                 case 'x':
1243                                         if (!yres_specified) {
1244                                                 yres = simple_strtoul(&name[i+1], NULL, 0);
1245                                                 yres_specified = 1;
1246                                         } else
1247                                                 goto done;
1248                                         break;
1249                                 case '0' ... '9':
1250                                         break;
1251                                 default:
1252                                         goto done;
1253                                 }
1254                         }
1255                         if (i < 0 && yres_specified) {
1256                                 xres = simple_strtoul(name, NULL, 0);
1257                                 res_specified = 1;
1258                         }
1259                 done:
1260                         if (res_specified) {
1261                                 dev_info(dev, "overriding resolution: %dx%d\n", xres, yres);
1262                                 inf->modes[0].xres = xres; inf->modes[0].yres = yres;
1263                         }
1264                         if (bpp_specified)
1265                                 switch (bpp) {
1266                                 case 1:
1267                                 case 2:
1268                                 case 4:
1269                                 case 8:
1270                                 case 16:
1271                                         inf->modes[0].bpp = bpp;
1272                                         dev_info(dev, "overriding bit depth: %d\n", bpp);
1273                                         break;
1274                                 default:
1275                                         dev_err(dev, "Depth %d is not valid\n", bpp);
1276                                 }
1277                 } else if (!strncmp(this_opt, "pixclock:", 9)) {
1278                         inf->modes[0].pixclock = simple_strtoul(this_opt+9, NULL, 0);
1279                         dev_info(dev, "override pixclock: %ld\n", inf->modes[0].pixclock);
1280                 } else if (!strncmp(this_opt, "left:", 5)) {
1281                         inf->modes[0].left_margin = simple_strtoul(this_opt+5, NULL, 0);
1282                         dev_info(dev, "override left: %u\n", inf->modes[0].left_margin);
1283                 } else if (!strncmp(this_opt, "right:", 6)) {
1284                         inf->modes[0].right_margin = simple_strtoul(this_opt+6, NULL, 0);
1285                         dev_info(dev, "override right: %u\n", inf->modes[0].right_margin);
1286                 } else if (!strncmp(this_opt, "upper:", 6)) {
1287                         inf->modes[0].upper_margin = simple_strtoul(this_opt+6, NULL, 0);
1288                         dev_info(dev, "override upper: %u\n", inf->modes[0].upper_margin);
1289                 } else if (!strncmp(this_opt, "lower:", 6)) {
1290                         inf->modes[0].lower_margin = simple_strtoul(this_opt+6, NULL, 0);
1291                         dev_info(dev, "override lower: %u\n", inf->modes[0].lower_margin);
1292                 } else if (!strncmp(this_opt, "hsynclen:", 9)) {
1293                         inf->modes[0].hsync_len = simple_strtoul(this_opt+9, NULL, 0);
1294                         dev_info(dev, "override hsynclen: %u\n", inf->modes[0].hsync_len);
1295                 } else if (!strncmp(this_opt, "vsynclen:", 9)) {
1296                         inf->modes[0].vsync_len = simple_strtoul(this_opt+9, NULL, 0);
1297                         dev_info(dev, "override vsynclen: %u\n", inf->modes[0].vsync_len);
1298                 } else if (!strncmp(this_opt, "hsync:", 6)) {
1299                         if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
1300                                 dev_info(dev, "override hsync: Active Low\n");
1301                                 inf->modes[0].sync &= ~FB_SYNC_HOR_HIGH_ACT;
1302                         } else {
1303                                 dev_info(dev, "override hsync: Active High\n");
1304                                 inf->modes[0].sync |= FB_SYNC_HOR_HIGH_ACT;
1305                         }
1306                 } else if (!strncmp(this_opt, "vsync:", 6)) {
1307                         if (simple_strtoul(this_opt+6, NULL, 0) == 0) {
1308                                 dev_info(dev, "override vsync: Active Low\n");
1309                                 inf->modes[0].sync &= ~FB_SYNC_VERT_HIGH_ACT;
1310                         } else {
1311                                 dev_info(dev, "override vsync: Active High\n");
1312                                 inf->modes[0].sync |= FB_SYNC_VERT_HIGH_ACT;
1313                         }
1314                 } else if (!strncmp(this_opt, "dpc:", 4)) {
1315                         if (simple_strtoul(this_opt+4, NULL, 0) == 0) {
1316                                 dev_info(dev, "override double pixel clock: false\n");
1317                                 inf->lccr3 &= ~LCCR3_DPC;
1318                         } else {
1319                                 dev_info(dev, "override double pixel clock: true\n");
1320                                 inf->lccr3 |= LCCR3_DPC;
1321                         }
1322                 } else if (!strncmp(this_opt, "outputen:", 9)) {
1323                         if (simple_strtoul(this_opt+9, NULL, 0) == 0) {
1324                                 dev_info(dev, "override output enable: active low\n");
1325                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnL;
1326                         } else {
1327                                 dev_info(dev, "override output enable: active high\n");
1328                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_OEP) | LCCR3_OutEnH;
1329                         }
1330                 } else if (!strncmp(this_opt, "pixclockpol:", 12)) {
1331                         if (simple_strtoul(this_opt+12, NULL, 0) == 0) {
1332                                 dev_info(dev, "override pixel clock polarity: falling edge\n");
1333                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixFlEdg;
1334                         } else {
1335                                 dev_info(dev, "override pixel clock polarity: rising edge\n");
1336                                 inf->lccr3 = (inf->lccr3 & ~LCCR3_PCP) | LCCR3_PixRsEdg;
1337                         }
1338                 } else if (!strncmp(this_opt, "color", 5)) {
1339                         inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Color;
1340                 } else if (!strncmp(this_opt, "mono", 4)) {
1341                         inf->lccr0 = (inf->lccr0 & ~LCCR0_CMS) | LCCR0_Mono;
1342                 } else if (!strncmp(this_opt, "active", 6)) {
1343                         inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Act;
1344                 } else if (!strncmp(this_opt, "passive", 7)) {
1345                         inf->lccr0 = (inf->lccr0 & ~LCCR0_PAS) | LCCR0_Pas;
1346                 } else if (!strncmp(this_opt, "single", 6)) {
1347                         inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Sngl;
1348                 } else if (!strncmp(this_opt, "dual", 4)) {
1349                         inf->lccr0 = (inf->lccr0 & ~LCCR0_SDS) | LCCR0_Dual;
1350                 } else if (!strncmp(this_opt, "4pix", 4)) {
1351                         inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_4PixMono;
1352                 } else if (!strncmp(this_opt, "8pix", 4)) {
1353                         inf->lccr0 = (inf->lccr0 & ~LCCR0_DPD) | LCCR0_8PixMono;
1354                 } else {
1355                         dev_err(dev, "unknown option: %s\n", this_opt);
1356                         return -EINVAL;
1357                 }
1358         }
1359         return 0;
1360
1361 }
1362 #endif
1363
1364 static int __init pxafb_probe(struct platform_device *dev)
1365 {
1366         struct pxafb_info *fbi;
1367         struct pxafb_mach_info *inf;
1368         int ret;
1369
1370         dev_dbg(&dev->dev, "pxafb_probe\n");
1371
1372         inf = dev->dev.platform_data;
1373         ret = -ENOMEM;
1374         fbi = NULL;
1375         if (!inf)
1376                 goto failed;
1377
1378 #ifdef CONFIG_FB_PXA_PARAMETERS
1379         ret = pxafb_parse_options(&dev->dev, g_options);
1380         if (ret < 0)
1381                 goto failed;
1382 #endif
1383
1384 #ifdef DEBUG_VAR
1385         /* Check for various illegal bit-combinations. Currently only
1386          * a warning is given. */
1387
1388         if (inf->lccr0 & LCCR0_INVALID_CONFIG_MASK)
1389                 dev_warn(&dev->dev, "machine LCCR0 setting contains illegal bits: %08x\n",
1390                         inf->lccr0 & LCCR0_INVALID_CONFIG_MASK);
1391         if (inf->lccr3 & LCCR3_INVALID_CONFIG_MASK)
1392                 dev_warn(&dev->dev, "machine LCCR3 setting contains illegal bits: %08x\n",
1393                         inf->lccr3 & LCCR3_INVALID_CONFIG_MASK);
1394         if (inf->lccr0 & LCCR0_DPD &&
1395             ((inf->lccr0 & LCCR0_PAS) != LCCR0_Pas ||
1396              (inf->lccr0 & LCCR0_SDS) != LCCR0_Sngl ||
1397              (inf->lccr0 & LCCR0_CMS) != LCCR0_Mono))
1398                 dev_warn(&dev->dev, "Double Pixel Data (DPD) mode is only valid in passive mono"
1399                          " single panel mode\n");
1400         if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Act &&
1401             (inf->lccr0 & LCCR0_SDS) == LCCR0_Dual)
1402                 dev_warn(&dev->dev, "Dual panel only valid in passive mode\n");
1403         if ((inf->lccr0 & LCCR0_PAS) == LCCR0_Pas &&
1404              (inf->modes->upper_margin || inf->modes->lower_margin))
1405                 dev_warn(&dev->dev, "Upper and lower margins must be 0 in passive mode\n");
1406 #endif
1407
1408         dev_dbg(&dev->dev, "got a %dx%dx%d LCD\n",inf->modes->xres, inf->modes->yres, inf->modes->bpp);
1409         if (inf->modes->xres == 0 || inf->modes->yres == 0 || inf->modes->bpp == 0) {
1410                 dev_err(&dev->dev, "Invalid resolution or bit depth\n");
1411                 ret = -EINVAL;
1412                 goto failed;
1413         }
1414         pxafb_backlight_power = inf->pxafb_backlight_power;
1415         pxafb_lcd_power = inf->pxafb_lcd_power;
1416         fbi = pxafb_init_fbinfo(&dev->dev);
1417         if (!fbi) {
1418                 dev_err(&dev->dev, "Failed to initialize framebuffer device\n");
1419                 ret = -ENOMEM; // only reason for pxafb_init_fbinfo to fail is kmalloc
1420                 goto failed;
1421         }
1422
1423         /* Initialize video memory */
1424         ret = pxafb_map_video_memory(fbi);
1425         if (ret) {
1426                 dev_err(&dev->dev, "Failed to allocate video RAM: %d\n", ret);
1427                 ret = -ENOMEM;
1428                 goto failed;
1429         }
1430
1431         ret = request_irq(IRQ_LCD, pxafb_handle_irq, IRQF_DISABLED, "LCD", fbi);
1432         if (ret) {
1433                 dev_err(&dev->dev, "request_irq failed: %d\n", ret);
1434                 ret = -EBUSY;
1435                 goto failed;
1436         }
1437
1438         /*
1439          * This makes sure that our colour bitfield
1440          * descriptors are correctly initialised.
1441          */
1442         pxafb_check_var(&fbi->fb.var, &fbi->fb);
1443         pxafb_set_par(&fbi->fb);
1444
1445         platform_set_drvdata(dev, fbi);
1446
1447         ret = register_framebuffer(&fbi->fb);
1448         if (ret < 0) {
1449                 dev_err(&dev->dev, "Failed to register framebuffer device: %d\n", ret);
1450                 goto failed;
1451         }
1452
1453 #ifdef CONFIG_PM
1454         // TODO
1455 #endif
1456
1457 #ifdef CONFIG_CPU_FREQ
1458         fbi->freq_transition.notifier_call = pxafb_freq_transition;
1459         fbi->freq_policy.notifier_call = pxafb_freq_policy;
1460         cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
1461         cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
1462 #endif
1463
1464         /*
1465          * Ok, now enable the LCD controller
1466          */
1467         set_ctrlr_state(fbi, C_ENABLE);
1468
1469         return 0;
1470
1471 failed:
1472         platform_set_drvdata(dev, NULL);
1473         kfree(fbi);
1474         return ret;
1475 }
1476
1477 static struct platform_driver pxafb_driver = {
1478         .probe          = pxafb_probe,
1479 #ifdef CONFIG_PM
1480         .suspend        = pxafb_suspend,
1481         .resume         = pxafb_resume,
1482 #endif
1483         .driver         = {
1484                 .name   = "pxa2xx-fb",
1485         },
1486 };
1487
1488 #ifndef MODULE
1489 static int __devinit pxafb_setup(char *options)
1490 {
1491 # ifdef CONFIG_FB_PXA_PARAMETERS
1492         if (options)
1493                 strlcpy(g_options, options, sizeof(g_options));
1494 # endif
1495         return 0;
1496 }
1497 #else
1498 # ifdef CONFIG_FB_PXA_PARAMETERS
1499 module_param_string(options, g_options, sizeof(g_options), 0);
1500 MODULE_PARM_DESC(options, "LCD parameters (see Documentation/fb/pxafb.txt)");
1501 # endif
1502 #endif
1503
1504 static int __devinit pxafb_init(void)
1505 {
1506 #ifndef MODULE
1507         char *option = NULL;
1508
1509         if (fb_get_options("pxafb", &option))
1510                 return -ENODEV;
1511         pxafb_setup(option);
1512 #endif
1513         return platform_driver_register(&pxafb_driver);
1514 }
1515
1516 module_init(pxafb_init);
1517
1518 MODULE_DESCRIPTION("loadable framebuffer driver for PXA");
1519 MODULE_LICENSE("GPL");