drivers/video/fbdev/sa1100fb.c

   1 /*
   2  *  linux/drivers/video/sa1100fb.c
   3  *
   4  *  Copyright (C) 1999 Eric A. Thomas
   5  *   Based on acornfb.c Copyright (C) Russell King.
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file COPYING in the main directory of this archive for
   9  * more details.
  10  *
  11  *              StrongARM 1100 LCD Controller Frame Buffer Driver
  12  *
  13  * Please direct your questions and comments on this driver to the following
  14  * email address:
  15  *
  16  *      linux-arm-kernel@lists.arm.linux.org.uk
  17  *
  18  * Clean patches should be sent to the ARM Linux Patch System.  Please see the
  19  * following web page for more information:
  20  *
  21  *      https://www.arm.linux.org.uk/developer/patches/info.shtml
  22  *
  23  * Thank you.
  24  *
  25  * Known problems:
  26  *      - With the Neponset plugged into an Assabet, LCD powerdown
  27  *        doesn't work (LCD stays powered up).  Therefore we shouldn't
  28  *        blank the screen.
  29  *      - We don't limit the CPU clock rate nor the mode selection
  30  *        according to the available SDRAM bandwidth.
  31  *
  32  * Other notes:
  33  *      - Linear grayscale palettes and the kernel.
  34  *        Such code does not belong in the kernel.  The kernel frame buffer
  35  *        drivers do not expect a linear colourmap, but a colourmap based on
  36  *        the VT100 standard mapping.
  37  *
  38  *        If your _userspace_ requires a linear colourmap, then the setup of
  39  *        such a colourmap belongs _in userspace_, not in the kernel.  Code
  40  *        to set the colourmap correctly from user space has been sent to
  41  *        David Neuer.  It's around 8 lines of C code, plus another 4 to
  42  *        detect if we are using grayscale.
  43  *
  44  *      - The following must never be specified in a panel definition:
  45  *           LCCR0_LtlEnd, LCCR3_PixClkDiv, LCCR3_VrtSnchL, LCCR3_HorSnchL
  46  *
  47  *      - The following should be specified:
  48  *           either LCCR0_Color or LCCR0_Mono
  49  *           either LCCR0_Sngl or LCCR0_Dual
  50  *           either LCCR0_Act or LCCR0_Pas
  51  *           either LCCR3_OutEnH or LCCD3_OutEnL
  52  *           either LCCR3_PixRsEdg or LCCR3_PixFlEdg
  53  *           either LCCR3_ACBsDiv or LCCR3_ACBsCntOff
  54  *
  55  * Code Status:
  56  * 1999/04/01:
  57  *      - Driver appears to be working for Brutus 320x200x8bpp mode.  Other
  58  *        resolutions are working, but only the 8bpp mode is supported.
  59  *        Changes need to be made to the palette encode and decode routines
  60  *        to support 4 and 16 bpp modes.
  61  *        Driver is not designed to be a module.  The FrameBuffer is statically
  62  *        allocated since dynamic allocation of a 300k buffer cannot be
  63  *        guaranteed.
  64  *
  65  * 1999/06/17:
  66  *      - FrameBuffer memory is now allocated at run-time when the
  67  *        driver is initialized.
  68  *
  69  * 2000/04/10: Nicolas Pitre <nico@fluxnic.net>
  70  *      - Big cleanup for dynamic selection of machine type at run time.
  71  *
  72  * 2000/07/19: Jamey Hicks <jamey@crl.dec.com>
  73  *      - Support for Bitsy aka Compaq iPAQ H3600 added.
  74  *
  75  * 2000/08/07: Tak-Shing Chan <tchan.rd@idthk.com>
  76  *             Jeff Sutherland <jsutherland@accelent.com>
  77  *      - Resolved an issue caused by a change made to the Assabet's PLD
  78  *        earlier this year which broke the framebuffer driver for newer
  79  *        Phase 4 Assabets.  Some other parameters were changed to optimize
  80  *        for the Sharp display.
  81  *
  82  * 2000/08/09: Kunihiko IMAI <imai@vasara.co.jp>
  83  *      - XP860 support added
  84  *
  85  * 2000/08/19: Mark Huang <mhuang@livetoy.com>
  86  *      - Allows standard options to be passed on the kernel command line
  87  *        for most common passive displays.
  88  *
  89  * 2000/08/29:
  90  *      - s/save_flags_cli/local_irq_save/
  91  *      - remove unneeded extra save_flags_cli in sa1100fb_enable_lcd_controller
  92  *
  93  * 2000/10/10: Erik Mouw <J.A.K.Mouw@its.tudelft.nl>
  94  *      - Updated LART stuff. Fixed some minor bugs.
  95  *
  96  * 2000/10/30: Murphy Chen <murphy@mail.dialogue.com.tw>
  97  *      - Pangolin support added
  98  *
  99  * 2000/10/31: Roman Jordan <jor@hoeft-wessel.de>
 100  *      - Huw Webpanel support added
 101  *
 102  * 2000/11/23: Eric Peng <ericpeng@coventive.com>
 103  *      - Freebird add
 104  *
 105  * 2001/02/07: Jamey Hicks <jamey.hicks@compaq.com>
 106  *             Cliff Brake <cbrake@accelent.com>
 107  *      - Added PM callback
 108  *
 109  * 2001/05/26: <rmk@arm.linux.org.uk>
 110  *      - Fix 16bpp so that (a) we use the right colours rather than some
 111  *        totally random colour depending on what was in page 0, and (b)
 112  *        we don't de-reference a NULL pointer.
 113  *      - remove duplicated implementation of consistent_alloc()
 114  *      - convert dma address types to dma_addr_t
 115  *      - remove unused 'montype' stuff
 116  *      - remove redundant zero inits of init_var after the initial
 117  *        memset.
 118  *      - remove allow_modeset (acornfb idea does not belong here)
 119  *
 120  * 2001/05/28: <rmk@arm.linux.org.uk>
 121  *      - massive cleanup - move machine dependent data into structures
 122  *      - I've left various #warnings in - if you see one, and know
 123  *        the hardware concerned, please get in contact with me.
 124  *
 125  * 2001/05/31: <rmk@arm.linux.org.uk>
 126  *      - Fix LCCR1 HSW value, fix all machine type specifications to
 127  *        keep values in line.  (Please check your machine type specs)
 128  *
 129  * 2001/06/10: <rmk@arm.linux.org.uk>
 130  *      - Fiddle with the LCD controller from task context only; mainly
 131  *        so that we can run with interrupts on, and sleep.
 132  *      - Convert #warnings into #errors.  No pain, no gain. ;)
 133  *
 134  * 2001/06/14: <rmk@arm.linux.org.uk>
 135  *      - Make the palette BPS value for 12bpp come out correctly.
 136  *      - Take notice of "greyscale" on any colour depth.
 137  *      - Make truecolor visuals use the RGB channel encoding information.
 138  *
 139  * 2001/07/02: <rmk@arm.linux.org.uk>
 140  *      - Fix colourmap problems.
 141  *
 142  * 2001/07/13: <abraham@2d3d.co.za>
 143  *      - Added support for the ICP LCD-Kit01 on LART. This LCD is
 144  *        manufactured by Prime View, model no V16C6448AB
 145  *
 146  * 2001/07/23: <rmk@arm.linux.org.uk>
 147  *      - Hand merge version from handhelds.org CVS tree.  See patch
 148  *        notes for 595/1 for more information.
 149  *      - Drop 12bpp (it's 16bpp with different colour register mappings).
 150  *      - This hardware can not do direct colour.  Therefore we don't
 151  *        support it.
 152  *
 153  * 2001/07/27: <rmk@arm.linux.org.uk>
 154  *      - Halve YRES on dual scan LCDs.
 155  *
 156  * 2001/08/22: <rmk@arm.linux.org.uk>
 157  *      - Add b/w iPAQ pixclock value.
 158  *
 159  * 2001/10/12: <rmk@arm.linux.org.uk>
 160  *      - Add patch 681/1 and clean up stork definitions.
 161  */
 162
 163 #include <linux/module.h>
 164 #include <linux/kernel.h>
 165 #include <linux/sched.h>
 166 #include <linux/errno.h>
 167 #include <linux/string.h>
 168 #include <linux/interrupt.h>
 169 #include <linux/slab.h>
 170 #include <linux/mm.h>
 171 #include <linux/fb.h>
 172 #include <linux/delay.h>
 173 #include <linux/init.h>
 174 #include <linux/ioport.h>
 175 #include <linux/cpufreq.h>
 176 #include <linux/gpio/consumer.h>
 177 #include <linux/platform_device.h>
 178 #include <linux/dma-mapping.h>
 179 #include <linux/mutex.h>
 180 #include <linux/io.h>
 181 #include <linux/clk.h>
 182
 183 #include <video/sa1100fb.h>
 184
 185 #include <mach/hardware.h>
 186 #include <asm/mach-types.h>
 187
 188 /*
 189  * Complain if VAR is out of range.
 190  */
 191 #define DEBUG_VAR 1
 192
 193 #include "sa1100fb.h"
 194
 195 static const struct sa1100fb_rgb rgb_4 = {
 196         .red    = { .offset = 0,  .length = 4, },
 197         .green  = { .offset = 0,  .length = 4, },
 198         .blue   = { .offset = 0,  .length = 4, },
 199         .transp = { .offset = 0,  .length = 0, },
 200 };
 201
 202 static const struct sa1100fb_rgb rgb_8 = {
 203         .red    = { .offset = 0,  .length = 8, },
 204         .green  = { .offset = 0,  .length = 8, },
 205         .blue   = { .offset = 0,  .length = 8, },
 206         .transp = { .offset = 0,  .length = 0, },
 207 };
 208
 209 static const struct sa1100fb_rgb def_rgb_16 = {
 210         .red    = { .offset = 11, .length = 5, },
 211         .green  = { .offset = 5,  .length = 6, },
 212         .blue   = { .offset = 0,  .length = 5, },
 213         .transp = { .offset = 0,  .length = 0, },
 214 };
 215
 216
 217
 218 static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *);
 219 static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state);
 220
 221 static inline void sa1100fb_schedule_work(struct sa1100fb_info *fbi, u_int state)
 222 {
 223         unsigned long flags;
 224
 225         local_irq_save(flags);
 226         /*
 227          * We need to handle two requests being made at the same time.
 228          * There are two important cases:
 229          *  1. When we are changing VT (C_REENABLE) while unblanking (C_ENABLE)
 230          *     We must perform the unblanking, which will do our REENABLE for us.
 231          *  2. When we are blanking, but immediately unblank before we have
 232          *     blanked.  We do the "REENABLE" thing here as well, just to be sure.
 233          */
 234         if (fbi->task_state == C_ENABLE && state == C_REENABLE)
 235                 state = (u_int) -1;
 236         if (fbi->task_state == C_DISABLE && state == C_ENABLE)
 237                 state = C_REENABLE;
 238
 239         if (state != (u_int)-1) {
 240                 fbi->task_state = state;
 241                 schedule_work(&fbi->task);
 242         }
 243         local_irq_restore(flags);
 244 }
 245
 246 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 247 {
 248         chan &= 0xffff;
 249         chan >>= 16 - bf->length;
 250         return chan << bf->offset;
 251 }
 252
 253 /*
 254  * Convert bits-per-pixel to a hardware palette PBS value.
 255  */
 256 static inline u_int palette_pbs(struct fb_var_screeninfo *var)
 257 {
 258         int ret = 0;
 259         switch (var->bits_per_pixel) {
 260         case 4:  ret = 0 << 12; break;
 261         case 8:  ret = 1 << 12; break;
 262         case 16: ret = 2 << 12; break;
 263         }
 264         return ret;
 265 }
 266
 267 static int
 268 sa1100fb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue,
 269                        u_int trans, struct fb_info *info)
 270 {
 271         struct sa1100fb_info *fbi =
 272                 container_of(info, struct sa1100fb_info, fb);
 273         u_int val, ret = 1;
 274
 275         if (regno < fbi->palette_size) {
 276                 val = ((red >> 4) & 0xf00);
 277                 val |= ((green >> 8) & 0x0f0);
 278                 val |= ((blue >> 12) & 0x00f);
 279
 280                 if (regno == 0)
 281                         val |= palette_pbs(&fbi->fb.var);
 282
 283                 fbi->palette_cpu[regno] = val;
 284                 ret = 0;
 285         }
 286         return ret;
 287 }
 288
 289 static int
 290 sa1100fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 291                    u_int trans, struct fb_info *info)
 292 {
 293         struct sa1100fb_info *fbi =
 294                 container_of(info, struct sa1100fb_info, fb);
 295         unsigned int val;
 296         int ret = 1;
 297
 298         /*
 299          * If inverse mode was selected, invert all the colours
 300          * rather than the register number.  The register number
 301          * is what you poke into the framebuffer to produce the
 302          * colour you requested.
 303          */
 304         if (fbi->inf->cmap_inverse) {
 305                 red   = 0xffff - red;
 306                 green = 0xffff - green;
 307                 blue  = 0xffff - blue;
 308         }
 309
 310         /*
 311          * If greyscale is true, then we convert the RGB value
 312          * to greyscale no mater what visual we are using.
 313          */
 314         if (fbi->fb.var.grayscale)
 315                 red = green = blue = (19595 * red + 38470 * green +
 316                                         7471 * blue) >> 16;
 317
 318         switch (fbi->fb.fix.visual) {
 319         case FB_VISUAL_TRUECOLOR:
 320                 /*
 321                  * 12 or 16-bit True Colour.  We encode the RGB value
 322                  * according to the RGB bitfield information.
 323                  */
 324                 if (regno < 16) {
 325                         val  = chan_to_field(red, &fbi->fb.var.red);
 326                         val |= chan_to_field(green, &fbi->fb.var.green);
 327                         val |= chan_to_field(blue, &fbi->fb.var.blue);
 328
 329                         fbi->pseudo_palette[regno] = val;
 330                         ret = 0;
 331                 }
 332                 break;
 333
 334         case FB_VISUAL_STATIC_PSEUDOCOLOR:
 335         case FB_VISUAL_PSEUDOCOLOR:
 336                 ret = sa1100fb_setpalettereg(regno, red, green, blue, trans, info);
 337                 break;
 338         }
 339
 340         return ret;
 341 }
 342
 343 #ifdef CONFIG_CPU_FREQ
 344 /*
 345  *  sa1100fb_display_dma_period()
 346  *    Calculate the minimum period (in picoseconds) between two DMA
 347  *    requests for the LCD controller.  If we hit this, it means we're
 348  *    doing nothing but LCD DMA.
 349  */
 350 static inline unsigned int sa1100fb_display_dma_period(struct fb_var_screeninfo *var)
 351 {
 352         /*
 353          * Period = pixclock * bits_per_byte * bytes_per_transfer
 354          *              / memory_bits_per_pixel;
 355          */
 356         return var->pixclock * 8 * 16 / var->bits_per_pixel;
 357 }
 358 #endif
 359
 360 /*
 361  *  sa1100fb_check_var():
 362  *    Round up in the following order: bits_per_pixel, xres,
 363  *    yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale,
 364  *    bitfields, horizontal timing, vertical timing.
 365  */
 366 static int
 367 sa1100fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 368 {
 369         struct sa1100fb_info *fbi =
 370                 container_of(info, struct sa1100fb_info, fb);
 371         int rgbidx;
 372
 373         if (var->xres < MIN_XRES)
 374                 var->xres = MIN_XRES;
 375         if (var->yres < MIN_YRES)
 376                 var->yres = MIN_YRES;
 377         if (var->xres > fbi->inf->xres)
 378                 var->xres = fbi->inf->xres;
 379         if (var->yres > fbi->inf->yres)
 380                 var->yres = fbi->inf->yres;
 381         var->xres_virtual = max(var->xres_virtual, var->xres);
 382         var->yres_virtual = max(var->yres_virtual, var->yres);
 383
 384         dev_dbg(fbi->dev, "var->bits_per_pixel=%d\n", var->bits_per_pixel);
 385         switch (var->bits_per_pixel) {
 386         case 4:
 387                 rgbidx = RGB_4;
 388                 break;
 389         case 8:
 390                 rgbidx = RGB_8;
 391                 break;
 392         case 16:
 393                 rgbidx = RGB_16;
 394                 break;
 395         default:
 396                 return -EINVAL;
 397         }
 398
 399         /*
 400          * Copy the RGB parameters for this display
 401          * from the machine specific parameters.
 402          */
 403         var->red    = fbi->rgb[rgbidx]->red;
 404         var->green  = fbi->rgb[rgbidx]->green;
 405         var->blue   = fbi->rgb[rgbidx]->blue;
 406         var->transp = fbi->rgb[rgbidx]->transp;
 407
 408         dev_dbg(fbi->dev, "RGBT length = %d:%d:%d:%d\n",
 409                 var->red.length, var->green.length, var->blue.length,
 410                 var->transp.length);
 411
 412         dev_dbg(fbi->dev, "RGBT offset = %d:%d:%d:%d\n",
 413                 var->red.offset, var->green.offset, var->blue.offset,
 414                 var->transp.offset);
 415
 416 #ifdef CONFIG_CPU_FREQ
 417         dev_dbg(fbi->dev, "dma period = %d ps, clock = %ld kHz\n",
 418                 sa1100fb_display_dma_period(var),
 419                 clk_get_rate(fbi->clk) / 1000);
 420 #endif
 421
 422         return 0;
 423 }
 424
 425 static void sa1100fb_set_visual(struct sa1100fb_info *fbi, u32 visual)
 426 {
 427         if (fbi->inf->set_visual)
 428                 fbi->inf->set_visual(visual);
 429 }
 430
 431 /*
 432  * sa1100fb_set_par():
 433  *      Set the user defined part of the display for the specified console
 434  */
 435 static int sa1100fb_set_par(struct fb_info *info)
 436 {
 437         struct sa1100fb_info *fbi =
 438                 container_of(info, struct sa1100fb_info, fb);
 439         struct fb_var_screeninfo *var = &info->var;
 440         unsigned long palette_mem_size;
 441
 442         dev_dbg(fbi->dev, "set_par\n");
 443
 444         if (var->bits_per_pixel == 16)
 445                 fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
 446         else if (!fbi->inf->cmap_static)
 447                 fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
 448         else {
 449                 /*
 450                  * Some people have weird ideas about wanting static
 451                  * pseudocolor maps.  I suspect their user space
 452                  * applications are broken.
 453                  */
 454                 fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 455         }
 456
 457         fbi->fb.fix.line_length = var->xres_virtual *
 458                                   var->bits_per_pixel / 8;
 459         fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 460
 461         palette_mem_size = fbi->palette_size * sizeof(u16);
 462
 463         dev_dbg(fbi->dev, "palette_mem_size = 0x%08lx\n", palette_mem_size);
 464
 465         fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
 466         fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
 467
 468         /*
 469          * Set (any) board control register to handle new color depth
 470          */
 471         sa1100fb_set_visual(fbi, fbi->fb.fix.visual);
 472         sa1100fb_activate_var(var, fbi);
 473
 474         return 0;
 475 }
 476
 477 #if 0
 478 static int
 479 sa1100fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
 480                   struct fb_info *info)
 481 {
 482         struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
 483
 484         /*
 485          * Make sure the user isn't doing something stupid.
 486          */
 487         if (!kspc && (fbi->fb.var.bits_per_pixel == 16 || fbi->inf->cmap_static))
 488                 return -EINVAL;
 489
 490         return gen_set_cmap(cmap, kspc, con, info);
 491 }
 492 #endif
 493
 494 /*
 495  * Formal definition of the VESA spec:
 496  *  On
 497  *      This refers to the state of the display when it is in full operation
 498  *  Stand-By
 499  *      This defines an optional operating state of minimal power reduction with
 500  *      the shortest recovery time
 501  *  Suspend
 502  *      This refers to a level of power management in which substantial power
 503  *      reduction is achieved by the display.  The display can have a longer
 504  *      recovery time from this state than from the Stand-by state
 505  *  Off
 506  *      This indicates that the display is consuming the lowest level of power
 507  *      and is non-operational. Recovery from this state may optionally require
 508  *      the user to manually power on the monitor
 509  *
 510  *  Now, the fbdev driver adds an additional state, (blank), where they
 511  *  turn off the video (maybe by colormap tricks), but don't mess with the
 512  *  video itself: think of it semantically between on and Stand-By.
 513  *
 514  *  So here's what we should do in our fbdev blank routine:
 515  *
 516  *      VESA_NO_BLANKING (mode 0)       Video on,  front/back light on
 517  *      VESA_VSYNC_SUSPEND (mode 1)     Video on,  front/back light off
 518  *      VESA_HSYNC_SUSPEND (mode 2)     Video on,  front/back light off
 519  *      VESA_POWERDOWN (mode 3)         Video off, front/back light off
 520  *
 521  *  This will match the matrox implementation.
 522  */
 523 /*
 524  * sa1100fb_blank():
 525  *      Blank the display by setting all palette values to zero.  Note, the
 526  *      12 and 16 bpp modes don't really use the palette, so this will not
 527  *      blank the display in all modes.
 528  */
 529 static int sa1100fb_blank(int blank, struct fb_info *info)
 530 {
 531         struct sa1100fb_info *fbi =
 532                 container_of(info, struct sa1100fb_info, fb);
 533         int i;
 534
 535         dev_dbg(fbi->dev, "sa1100fb_blank: blank=%d\n", blank);
 536
 537         switch (blank) {
 538         case FB_BLANK_POWERDOWN:
 539         case FB_BLANK_VSYNC_SUSPEND:
 540         case FB_BLANK_HSYNC_SUSPEND:
 541         case FB_BLANK_NORMAL:
 542                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 543                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 544                         for (i = 0; i < fbi->palette_size; i++)
 545                                 sa1100fb_setpalettereg(i, 0, 0, 0, 0, info);
 546                 sa1100fb_schedule_work(fbi, C_DISABLE);
 547                 break;
 548
 549         case FB_BLANK_UNBLANK:
 550                 if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 551                     fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 552                         fb_set_cmap(&fbi->fb.cmap, info);
 553                 sa1100fb_schedule_work(fbi, C_ENABLE);
 554         }
 555         return 0;
 556 }
 557
 558 static int sa1100fb_mmap(struct fb_info *info,
 559                          struct vm_area_struct *vma)
 560 {
 561         struct sa1100fb_info *fbi =
 562                 container_of(info, struct sa1100fb_info, fb);
 563         unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
 564
 565         if (off < info->fix.smem_len) {
 566                 vma->vm_pgoff += 1; /* skip over the palette */
 567                 return dma_mmap_wc(fbi->dev, vma, fbi->map_cpu, fbi->map_dma,
 568                                    fbi->map_size);
 569         }
 570
 571         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 572
 573         return vm_iomap_memory(vma, info->fix.mmio_start, info->fix.mmio_len);
 574 }
 575
 576 static const struct fb_ops sa1100fb_ops = {
 577         .owner          = THIS_MODULE,
 578         .fb_check_var   = sa1100fb_check_var,
 579         .fb_set_par     = sa1100fb_set_par,
 580 //      .fb_set_cmap    = sa1100fb_set_cmap,
 581         .fb_setcolreg   = sa1100fb_setcolreg,
 582         .fb_fillrect    = cfb_fillrect,
 583         .fb_copyarea    = cfb_copyarea,
 584         .fb_imageblit   = cfb_imageblit,
 585         .fb_blank       = sa1100fb_blank,
 586         .fb_mmap        = sa1100fb_mmap,
 587 };
 588
 589 /*
 590  * Calculate the PCD value from the clock rate (in picoseconds).
 591  * We take account of the PPCR clock setting.
 592  */
 593 static inline unsigned int get_pcd(struct sa1100fb_info *fbi,
 594                 unsigned int pixclock)
 595 {
 596         unsigned int pcd = clk_get_rate(fbi->clk) / 100 / 1000;
 597
 598         pcd *= pixclock;
 599         pcd /= 10000000;
 600
 601         return pcd + 1; /* make up for integer math truncations */
 602 }
 603
 604 /*
 605  * sa1100fb_activate_var():
 606  *      Configures LCD Controller based on entries in var parameter.  Settings are
 607  *      only written to the controller if changes were made.
 608  */
 609 static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *fbi)
 610 {
 611         struct sa1100fb_lcd_reg new_regs;
 612         u_int half_screen_size, yres, pcd;
 613         u_long flags;
 614
 615         dev_dbg(fbi->dev, "Configuring SA1100 LCD\n");
 616
 617         dev_dbg(fbi->dev, "var: xres=%d hslen=%d lm=%d rm=%d\n",
 618                 var->xres, var->hsync_len,
 619                 var->left_margin, var->right_margin);
 620         dev_dbg(fbi->dev, "var: yres=%d vslen=%d um=%d bm=%d\n",
 621                 var->yres, var->vsync_len,
 622                 var->upper_margin, var->lower_margin);
 623
 624 #if DEBUG_VAR
 625         if (var->xres < 16        || var->xres > 1024)
 626                 dev_err(fbi->dev, "%s: invalid xres %d\n",
 627                         fbi->fb.fix.id, var->xres);
 628         if (var->hsync_len < 1    || var->hsync_len > 64)
 629                 dev_err(fbi->dev, "%s: invalid hsync_len %d\n",
 630                         fbi->fb.fix.id, var->hsync_len);
 631         if (var->left_margin < 1  || var->left_margin > 255)
 632                 dev_err(fbi->dev, "%s: invalid left_margin %d\n",
 633                         fbi->fb.fix.id, var->left_margin);
 634         if (var->right_margin < 1 || var->right_margin > 255)
 635                 dev_err(fbi->dev, "%s: invalid right_margin %d\n",
 636                         fbi->fb.fix.id, var->right_margin);
 637         if (var->yres < 1         || var->yres > 1024)
 638                 dev_err(fbi->dev, "%s: invalid yres %d\n",
 639                         fbi->fb.fix.id, var->yres);
 640         if (var->vsync_len < 1    || var->vsync_len > 64)
 641                 dev_err(fbi->dev, "%s: invalid vsync_len %d\n",
 642                         fbi->fb.fix.id, var->vsync_len);
 643         if (var->upper_margin < 0 || var->upper_margin > 255)
 644                 dev_err(fbi->dev, "%s: invalid upper_margin %d\n",
 645                         fbi->fb.fix.id, var->upper_margin);
 646         if (var->lower_margin < 0 || var->lower_margin > 255)
 647                 dev_err(fbi->dev, "%s: invalid lower_margin %d\n",
 648                         fbi->fb.fix.id, var->lower_margin);
 649 #endif
 650
 651         new_regs.lccr0 = fbi->inf->lccr0 |
 652                 LCCR0_LEN | LCCR0_LDM | LCCR0_BAM |
 653                 LCCR0_ERM | LCCR0_LtlEnd | LCCR0_DMADel(0);
 654
 655         new_regs.lccr1 =
 656                 LCCR1_DisWdth(var->xres) +
 657                 LCCR1_HorSnchWdth(var->hsync_len) +
 658                 LCCR1_BegLnDel(var->left_margin) +
 659                 LCCR1_EndLnDel(var->right_margin);
 660
 661         /*
 662          * If we have a dual scan LCD, then we need to halve
 663          * the YRES parameter.
 664          */
 665         yres = var->yres;
 666         if (fbi->inf->lccr0 & LCCR0_Dual)
 667                 yres /= 2;
 668
 669         new_regs.lccr2 =
 670                 LCCR2_DisHght(yres) +
 671                 LCCR2_VrtSnchWdth(var->vsync_len) +
 672                 LCCR2_BegFrmDel(var->upper_margin) +
 673                 LCCR2_EndFrmDel(var->lower_margin);
 674
 675         pcd = get_pcd(fbi, var->pixclock);
 676         new_regs.lccr3 = LCCR3_PixClkDiv(pcd) | fbi->inf->lccr3 |
 677                 (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
 678                 (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);
 679
 680         dev_dbg(fbi->dev, "nlccr0 = 0x%08lx\n", new_regs.lccr0);
 681         dev_dbg(fbi->dev, "nlccr1 = 0x%08lx\n", new_regs.lccr1);
 682         dev_dbg(fbi->dev, "nlccr2 = 0x%08lx\n", new_regs.lccr2);
 683         dev_dbg(fbi->dev, "nlccr3 = 0x%08lx\n", new_regs.lccr3);
 684
 685         half_screen_size = var->bits_per_pixel;
 686         half_screen_size = half_screen_size * var->xres * var->yres / 16;
 687
 688         /* Update shadow copy atomically */
 689         local_irq_save(flags);
 690         fbi->dbar1 = fbi->palette_dma;
 691         fbi->dbar2 = fbi->screen_dma + half_screen_size;
 692
 693         fbi->reg_lccr0 = new_regs.lccr0;
 694         fbi->reg_lccr1 = new_regs.lccr1;
 695         fbi->reg_lccr2 = new_regs.lccr2;
 696         fbi->reg_lccr3 = new_regs.lccr3;
 697         local_irq_restore(flags);
 698
 699         /*
 700          * Only update the registers if the controller is enabled
 701          * and something has changed.
 702          */
 703         if (readl_relaxed(fbi->base + LCCR0) != fbi->reg_lccr0 ||
 704             readl_relaxed(fbi->base + LCCR1) != fbi->reg_lccr1 ||
 705             readl_relaxed(fbi->base + LCCR2) != fbi->reg_lccr2 ||
 706             readl_relaxed(fbi->base + LCCR3) != fbi->reg_lccr3 ||
 707             readl_relaxed(fbi->base + DBAR1) != fbi->dbar1 ||
 708             readl_relaxed(fbi->base + DBAR2) != fbi->dbar2)
 709                 sa1100fb_schedule_work(fbi, C_REENABLE);
 710
 711         return 0;
 712 }
 713
 714 /*
 715  * NOTE!  The following functions are purely helpers for set_ctrlr_state.
 716  * Do not call them directly; set_ctrlr_state does the correct serialisation
 717  * to ensure that things happen in the right way 100% of time time.
 718  *      -- rmk
 719  */
 720 static inline void __sa1100fb_backlight_power(struct sa1100fb_info *fbi, int on)
 721 {
 722         dev_dbg(fbi->dev, "backlight o%s\n", on ? "n" : "ff");
 723
 724         if (fbi->inf->backlight_power)
 725                 fbi->inf->backlight_power(on);
 726 }
 727
 728 static inline void __sa1100fb_lcd_power(struct sa1100fb_info *fbi, int on)
 729 {
 730         dev_dbg(fbi->dev, "LCD power o%s\n", on ? "n" : "ff");
 731
 732         if (fbi->inf->lcd_power)
 733                 fbi->inf->lcd_power(on);
 734 }
 735
 736 static void sa1100fb_setup_gpio(struct sa1100fb_info *fbi)
 737 {
 738         u_int mask = 0;
 739
 740         /*
 741          * Enable GPIO<9:2> for LCD use if:
 742          *  1. Active display, or
 743          *  2. Color Dual Passive display
 744          *
 745          * see table 11.8 on page 11-27 in the SA1100 manual
 746          *   -- Erik.
 747          *
 748          * SA1110 spec update nr. 25 says we can and should
 749          * clear LDD15 to 12 for 4 or 8bpp modes with active
 750          * panels.
 751          */
 752         if ((fbi->reg_lccr0 & LCCR0_CMS) == LCCR0_Color &&
 753             (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) != 0) {
 754                 mask = GPIO_LDD11 | GPIO_LDD10 | GPIO_LDD9  | GPIO_LDD8;
 755
 756                 if (fbi->fb.var.bits_per_pixel > 8 ||
 757                     (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) == LCCR0_Dual)
 758                         mask |= GPIO_LDD15 | GPIO_LDD14 | GPIO_LDD13 | GPIO_LDD12;
 759
 760         }
 761
 762         if (mask) {
 763                 unsigned long flags;
 764
 765                 /*
 766                  * SA-1100 requires the GPIO direction register set
 767                  * appropriately for the alternate function.  Hence
 768                  * we set it here via bitmask rather than excessive
 769                  * fiddling via the GPIO subsystem - and even then
 770                  * we'll still have to deal with GAFR.
 771                  */
 772                 local_irq_save(flags);
 773                 GPDR |= mask;
 774                 GAFR |= mask;
 775                 local_irq_restore(flags);
 776         }
 777 }
 778
 779 static void sa1100fb_enable_controller(struct sa1100fb_info *fbi)
 780 {
 781         dev_dbg(fbi->dev, "Enabling LCD controller\n");
 782
 783         /*
 784          * Make sure the mode bits are present in the first palette entry
 785          */
 786         fbi->palette_cpu[0] &= 0xcfff;
 787         fbi->palette_cpu[0] |= palette_pbs(&fbi->fb.var);
 788
 789         /* enable LCD controller clock */
 790         clk_prepare_enable(fbi->clk);
 791
 792         /* Sequence from 11.7.10 */
 793         writel_relaxed(fbi->reg_lccr3, fbi->base + LCCR3);
 794         writel_relaxed(fbi->reg_lccr2, fbi->base + LCCR2);
 795         writel_relaxed(fbi->reg_lccr1, fbi->base + LCCR1);
 796         writel_relaxed(fbi->reg_lccr0 & ~LCCR0_LEN, fbi->base + LCCR0);
 797         writel_relaxed(fbi->dbar1, fbi->base + DBAR1);
 798         writel_relaxed(fbi->dbar2, fbi->base + DBAR2);
 799         writel_relaxed(fbi->reg_lccr0 | LCCR0_LEN, fbi->base + LCCR0);
 800
 801         if (fbi->shannon_lcden)
 802                 gpiod_set_value(fbi->shannon_lcden, 1);
 803
 804         dev_dbg(fbi->dev, "DBAR1: 0x%08x\n", readl_relaxed(fbi->base + DBAR1));
 805         dev_dbg(fbi->dev, "DBAR2: 0x%08x\n", readl_relaxed(fbi->base + DBAR2));
 806         dev_dbg(fbi->dev, "LCCR0: 0x%08x\n", readl_relaxed(fbi->base + LCCR0));
 807         dev_dbg(fbi->dev, "LCCR1: 0x%08x\n", readl_relaxed(fbi->base + LCCR1));
 808         dev_dbg(fbi->dev, "LCCR2: 0x%08x\n", readl_relaxed(fbi->base + LCCR2));
 809         dev_dbg(fbi->dev, "LCCR3: 0x%08x\n", readl_relaxed(fbi->base + LCCR3));
 810 }
 811
 812 static void sa1100fb_disable_controller(struct sa1100fb_info *fbi)
 813 {
 814         DECLARE_WAITQUEUE(wait, current);
 815         u32 lccr0;
 816
 817         dev_dbg(fbi->dev, "Disabling LCD controller\n");
 818
 819         if (fbi->shannon_lcden)
 820                 gpiod_set_value(fbi->shannon_lcden, 0);
 821
 822         set_current_state(TASK_UNINTERRUPTIBLE);
 823         add_wait_queue(&fbi->ctrlr_wait, &wait);
 824
 825         /* Clear LCD Status Register */
 826         writel_relaxed(~0, fbi->base + LCSR);
 827
 828         lccr0 = readl_relaxed(fbi->base + LCCR0);
 829         lccr0 &= ~LCCR0_LDM;    /* Enable LCD Disable Done Interrupt */
 830         writel_relaxed(lccr0, fbi->base + LCCR0);
 831         lccr0 &= ~LCCR0_LEN;    /* Disable LCD Controller */
 832         writel_relaxed(lccr0, fbi->base + LCCR0);
 833
 834         schedule_timeout(20 * HZ / 1000);
 835         remove_wait_queue(&fbi->ctrlr_wait, &wait);
 836
 837         /* disable LCD controller clock */
 838         clk_disable_unprepare(fbi->clk);
 839 }
 840
 841 /*
 842  *  sa1100fb_handle_irq: Handle 'LCD DONE' interrupts.
 843  */
 844 static irqreturn_t sa1100fb_handle_irq(int irq, void *dev_id)
 845 {
 846         struct sa1100fb_info *fbi = dev_id;
 847         unsigned int lcsr = readl_relaxed(fbi->base + LCSR);
 848
 849         if (lcsr & LCSR_LDD) {
 850                 u32 lccr0 = readl_relaxed(fbi->base + LCCR0) | LCCR0_LDM;
 851                 writel_relaxed(lccr0, fbi->base + LCCR0);
 852                 wake_up(&fbi->ctrlr_wait);
 853         }
 854
 855         writel_relaxed(lcsr, fbi->base + LCSR);
 856         return IRQ_HANDLED;
 857 }
 858
 859 /*
 860  * This function must be called from task context only, since it will
 861  * sleep when disabling the LCD controller, or if we get two contending
 862  * processes trying to alter state.
 863  */
 864 static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state)
 865 {
 866         u_int old_state;
 867
 868         mutex_lock(&fbi->ctrlr_lock);
 869
 870         old_state = fbi->state;
 871
 872         /*
 873          * Hack around fbcon initialisation.
 874          */
 875         if (old_state == C_STARTUP && state == C_REENABLE)
 876                 state = C_ENABLE;
 877
 878         switch (state) {
 879         case C_DISABLE_CLKCHANGE:
 880                 /*
 881                  * Disable controller for clock change.  If the
 882                  * controller is already disabled, then do nothing.
 883                  */
 884                 if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
 885                         fbi->state = state;
 886                         sa1100fb_disable_controller(fbi);
 887                 }
 888                 break;
 889
 890         case C_DISABLE_PM:
 891         case C_DISABLE:
 892                 /*
 893                  * Disable controller
 894                  */
 895                 if (old_state != C_DISABLE) {
 896                         fbi->state = state;
 897
 898                         __sa1100fb_backlight_power(fbi, 0);
 899                         if (old_state != C_DISABLE_CLKCHANGE)
 900                                 sa1100fb_disable_controller(fbi);
 901                         __sa1100fb_lcd_power(fbi, 0);
 902                 }
 903                 break;
 904
 905         case C_ENABLE_CLKCHANGE:
 906                 /*
 907                  * Enable the controller after clock change.  Only
 908                  * do this if we were disabled for the clock change.
 909                  */
 910                 if (old_state == C_DISABLE_CLKCHANGE) {
 911                         fbi->state = C_ENABLE;
 912                         sa1100fb_enable_controller(fbi);
 913                 }
 914                 break;
 915
 916         case C_REENABLE:
 917                 /*
 918                  * Re-enable the controller only if it was already
 919                  * enabled.  This is so we reprogram the control
 920                  * registers.
 921                  */
 922                 if (old_state == C_ENABLE) {
 923                         sa1100fb_disable_controller(fbi);
 924                         sa1100fb_setup_gpio(fbi);
 925                         sa1100fb_enable_controller(fbi);
 926                 }
 927                 break;
 928
 929         case C_ENABLE_PM:
 930                 /*
 931                  * Re-enable the controller after PM.  This is not
 932                  * perfect - think about the case where we were doing
 933                  * a clock change, and we suspended half-way through.
 934                  */
 935                 if (old_state != C_DISABLE_PM)
 936                         break;
 937                 fallthrough;
 938
 939         case C_ENABLE:
 940                 /*
 941                  * Power up the LCD screen, enable controller, and
 942                  * turn on the backlight.
 943                  */
 944                 if (old_state != C_ENABLE) {
 945                         fbi->state = C_ENABLE;
 946                         sa1100fb_setup_gpio(fbi);
 947                         __sa1100fb_lcd_power(fbi, 1);
 948                         sa1100fb_enable_controller(fbi);
 949                         __sa1100fb_backlight_power(fbi, 1);
 950                 }
 951                 break;
 952         }
 953         mutex_unlock(&fbi->ctrlr_lock);
 954 }
 955
 956 /*
 957  * Our LCD controller task (which is called when we blank or unblank)
 958  * via keventd.
 959  */
 960 static void sa1100fb_task(struct work_struct *w)
 961 {
 962         struct sa1100fb_info *fbi = container_of(w, struct sa1100fb_info, task);
 963         u_int state = xchg(&fbi->task_state, -1);
 964
 965         set_ctrlr_state(fbi, state);
 966 }
 967
 968 #ifdef CONFIG_CPU_FREQ
 969 /*
 970  * CPU clock speed change handler.  We need to adjust the LCD timing
 971  * parameters when the CPU clock is adjusted by the power management
 972  * subsystem.
 973  */
 974 static int
 975 sa1100fb_freq_transition(struct notifier_block *nb, unsigned long val,
 976                          void *data)
 977 {
 978         struct sa1100fb_info *fbi = TO_INF(nb, freq_transition);
 979         u_int pcd;
 980
 981         switch (val) {
 982         case CPUFREQ_PRECHANGE:
 983                 set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
 984                 break;
 985
 986         case CPUFREQ_POSTCHANGE:
 987                 pcd = get_pcd(fbi, fbi->fb.var.pixclock);
 988                 fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
 989                 set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
 990                 break;
 991         }
 992         return 0;
 993 }
 994 #endif
 995
 996 #ifdef CONFIG_PM
 997 /*
 998  * Power management hooks.  Note that we won't be called from IRQ context,
 999  * unlike the blank functions above, so we may sleep.
1000  */
1001 static int sa1100fb_suspend(struct platform_device *dev, pm_message_t state)
1002 {
1003         struct sa1100fb_info *fbi = platform_get_drvdata(dev);
1004
1005         set_ctrlr_state(fbi, C_DISABLE_PM);
1006         return 0;
1007 }
1008
1009 static int sa1100fb_resume(struct platform_device *dev)
1010 {
1011         struct sa1100fb_info *fbi = platform_get_drvdata(dev);
1012
1013         set_ctrlr_state(fbi, C_ENABLE_PM);
1014         return 0;
1015 }
1016 #else
1017 #define sa1100fb_suspend        NULL
1018 #define sa1100fb_resume         NULL
1019 #endif
1020
1021 /*
1022  * sa1100fb_map_video_memory():
1023  *      Allocates the DRAM memory for the frame buffer.  This buffer is
1024  *      remapped into a non-cached, non-buffered, memory region to
1025  *      allow palette and pixel writes to occur without flushing the
1026  *      cache.  Once this area is remapped, all virtual memory
1027  *      access to the video memory should occur at the new region.
1028  */
1029 static int sa1100fb_map_video_memory(struct sa1100fb_info *fbi)
1030 {
1031         /*
1032          * We reserve one page for the palette, plus the size
1033          * of the framebuffer.
1034          */
1035         fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
1036         fbi->map_cpu = dma_alloc_wc(fbi->dev, fbi->map_size, &fbi->map_dma,
1037                                     GFP_KERNEL);
1038
1039         if (fbi->map_cpu) {
1040                 fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
1041                 fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
1042                 /*
1043                  * FIXME: this is actually the wrong thing to place in
1044                  * smem_start.  But fbdev suffers from the problem that
1045                  * it needs an API which doesn't exist (in this case,
1046                  * dma_writecombine_mmap)
1047                  */
1048                 fbi->fb.fix.smem_start = fbi->screen_dma;
1049         }
1050
1051         return fbi->map_cpu ? 0 : -ENOMEM;
1052 }
1053
1054 /* Fake monspecs to fill in fbinfo structure */
1055 static const struct fb_monspecs monspecs = {
1056         .hfmin  = 30000,
1057         .hfmax  = 70000,
1058         .vfmin  = 50,
1059         .vfmax  = 65,
1060 };
1061
1062
1063 static struct sa1100fb_info *sa1100fb_init_fbinfo(struct device *dev)
1064 {
1065         struct sa1100fb_mach_info *inf = dev_get_platdata(dev);
1066         struct sa1100fb_info *fbi;
1067         unsigned i;
1068
1069         fbi = devm_kzalloc(dev, sizeof(struct sa1100fb_info), GFP_KERNEL);
1070         if (!fbi)
1071                 return NULL;
1072
1073         fbi->dev = dev;
1074
1075         strcpy(fbi->fb.fix.id, SA1100_NAME);
1076
1077         fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
1078         fbi->fb.fix.type_aux    = 0;
1079         fbi->fb.fix.xpanstep    = 0;
1080         fbi->fb.fix.ypanstep    = 0;
1081         fbi->fb.fix.ywrapstep   = 0;
1082         fbi->fb.fix.accel       = FB_ACCEL_NONE;
1083
1084         fbi->fb.var.nonstd      = 0;
1085         fbi->fb.var.activate    = FB_ACTIVATE_NOW;
1086         fbi->fb.var.height      = -1;
1087         fbi->fb.var.width       = -1;
1088         fbi->fb.var.accel_flags = 0;
1089         fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
1090
1091         fbi->fb.fbops           = &sa1100fb_ops;
1092         fbi->fb.monspecs        = monspecs;
1093         fbi->fb.pseudo_palette  = fbi->pseudo_palette;
1094
1095         fbi->rgb[RGB_4]         = &rgb_4;
1096         fbi->rgb[RGB_8]         = &rgb_8;
1097         fbi->rgb[RGB_16]        = &def_rgb_16;
1098
1099         /*
1100          * People just don't seem to get this.  We don't support
1101          * anything but correct entries now, so panic if someone
1102          * does something stupid.
1103          */
1104         if (inf->lccr3 & (LCCR3_VrtSnchL|LCCR3_HorSnchL|0xff) ||
1105             inf->pixclock == 0)
1106                 panic("sa1100fb error: invalid LCCR3 fields set or zero "
1107                         "pixclock.");
1108
1109         fbi->fb.var.xres                = inf->xres;
1110         fbi->fb.var.xres_virtual        = inf->xres;
1111         fbi->fb.var.yres                = inf->yres;
1112         fbi->fb.var.yres_virtual        = inf->yres;
1113         fbi->fb.var.bits_per_pixel      = inf->bpp;
1114         fbi->fb.var.pixclock            = inf->pixclock;
1115         fbi->fb.var.hsync_len           = inf->hsync_len;
1116         fbi->fb.var.left_margin         = inf->left_margin;
1117         fbi->fb.var.right_margin        = inf->right_margin;
1118         fbi->fb.var.vsync_len           = inf->vsync_len;
1119         fbi->fb.var.upper_margin        = inf->upper_margin;
1120         fbi->fb.var.lower_margin        = inf->lower_margin;
1121         fbi->fb.var.sync                = inf->sync;
1122         fbi->fb.var.grayscale           = inf->cmap_greyscale;
1123         fbi->state                      = C_STARTUP;
1124         fbi->task_state                 = (u_char)-1;
1125         fbi->fb.fix.smem_len            = inf->xres * inf->yres *
1126                                           inf->bpp / 8;
1127         fbi->inf                        = inf;
1128
1129         /* Copy the RGB bitfield overrides */
1130         for (i = 0; i < NR_RGB; i++)
1131                 if (inf->rgb[i])
1132                         fbi->rgb[i] = inf->rgb[i];
1133
1134         init_waitqueue_head(&fbi->ctrlr_wait);
1135         INIT_WORK(&fbi->task, sa1100fb_task);
1136         mutex_init(&fbi->ctrlr_lock);
1137
1138         return fbi;
1139 }
1140
1141 static int sa1100fb_probe(struct platform_device *pdev)
1142 {
1143         struct sa1100fb_info *fbi;
1144         int ret, irq;
1145
1146         if (!dev_get_platdata(&pdev->dev)) {
1147                 dev_err(&pdev->dev, "no platform LCD data\n");
1148                 return -EINVAL;
1149         }
1150
1151         irq = platform_get_irq(pdev, 0);
1152         if (irq < 0)
1153                 return -EINVAL;
1154
1155         fbi = sa1100fb_init_fbinfo(&pdev->dev);
1156         if (!fbi)
1157                 return -ENOMEM;
1158
1159         fbi->base = devm_platform_ioremap_resource(pdev, 0);
1160         if (IS_ERR(fbi->base))
1161                 return PTR_ERR(fbi->base);
1162
1163         fbi->clk = devm_clk_get(&pdev->dev, NULL);
1164         if (IS_ERR(fbi->clk))
1165                 return PTR_ERR(fbi->clk);
1166
1167         ret = devm_request_irq(&pdev->dev, irq, sa1100fb_handle_irq, 0,
1168                                "LCD", fbi);
1169         if (ret) {
1170                 dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
1171                 return ret;
1172         }
1173
1174         fbi->shannon_lcden = gpiod_get_optional(&pdev->dev, "shannon-lcden",
1175                                                 GPIOD_OUT_LOW);
1176         if (IS_ERR(fbi->shannon_lcden))
1177                 return PTR_ERR(fbi->shannon_lcden);
1178
1179         /* Initialize video memory */
1180         ret = sa1100fb_map_video_memory(fbi);
1181         if (ret)
1182                 return ret;
1183
1184         /*
1185          * This makes sure that our colour bitfield
1186          * descriptors are correctly initialised.
1187          */
1188         sa1100fb_check_var(&fbi->fb.var, &fbi->fb);
1189
1190         platform_set_drvdata(pdev, fbi);
1191
1192         ret = register_framebuffer(&fbi->fb);
1193         if (ret < 0) {
1194                 dma_free_wc(fbi->dev, fbi->map_size, fbi->map_cpu,
1195                             fbi->map_dma);
1196                 return ret;
1197         }
1198
1199 #ifdef CONFIG_CPU_FREQ
1200         fbi->freq_transition.notifier_call = sa1100fb_freq_transition;
1201         cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
1202 #endif
1203
1204         /* This driver cannot be unloaded at the moment */
1205         return 0;
1206 }
1207
1208 static struct platform_driver sa1100fb_driver = {
1209         .probe          = sa1100fb_probe,
1210         .suspend        = sa1100fb_suspend,
1211         .resume         = sa1100fb_resume,
1212         .driver         = {
1213                 .name   = "sa11x0-fb",
1214         },
1215 };
1216
1217 int __init sa1100fb_init(void)
1218 {
1219         if (fb_get_options("sa1100fb", NULL))
1220                 return -ENODEV;
1221
1222         return platform_driver_register(&sa1100fb_driver);
1223 }
1224
1225 module_init(sa1100fb_init);
1226 MODULE_DESCRIPTION("StrongARM-1100/1110 framebuffer driver");
1227 MODULE_LICENSE("GPL");