linux/drivers/video/sa1100fb.c
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   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 *      http://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.h>
 177#include <linux/platform_device.h>
 178#include <linux/dma-mapping.h>
 179#include <linux/mutex.h>
 180#include <linux/io.h>
 181
 182#include <video/sa1100fb.h>
 183
 184#include <mach/hardware.h>
 185#include <asm/mach-types.h>
 186#include <mach/shannon.h>
 187
 188/*
 189 * Complain if VAR is out of range.
 190 */
 191#define DEBUG_VAR 1
 192
 193#include "sa1100fb.h"
 194
 195static 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
 202static 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
 209static 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
 218static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *);
 219static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state);
 220
 221static 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
 246static 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 */
 256static 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
 267static int
 268sa1100fb_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 = (struct sa1100fb_info *)info;
 272        u_int val, ret = 1;
 273
 274        if (regno < fbi->palette_size) {
 275                val = ((red >> 4) & 0xf00);
 276                val |= ((green >> 8) & 0x0f0);
 277                val |= ((blue >> 12) & 0x00f);
 278
 279                if (regno == 0)
 280                        val |= palette_pbs(&fbi->fb.var);
 281
 282                fbi->palette_cpu[regno] = val;
 283                ret = 0;
 284        }
 285        return ret;
 286}
 287
 288static int
 289sa1100fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
 290                   u_int trans, struct fb_info *info)
 291{
 292        struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
 293        unsigned int val;
 294        int ret = 1;
 295
 296        /*
 297         * If inverse mode was selected, invert all the colours
 298         * rather than the register number.  The register number
 299         * is what you poke into the framebuffer to produce the
 300         * colour you requested.
 301         */
 302        if (fbi->inf->cmap_inverse) {
 303                red   = 0xffff - red;
 304                green = 0xffff - green;
 305                blue  = 0xffff - blue;
 306        }
 307
 308        /*
 309         * If greyscale is true, then we convert the RGB value
 310         * to greyscale no mater what visual we are using.
 311         */
 312        if (fbi->fb.var.grayscale)
 313                red = green = blue = (19595 * red + 38470 * green +
 314                                        7471 * blue) >> 16;
 315
 316        switch (fbi->fb.fix.visual) {
 317        case FB_VISUAL_TRUECOLOR:
 318                /*
 319                 * 12 or 16-bit True Colour.  We encode the RGB value
 320                 * according to the RGB bitfield information.
 321                 */
 322                if (regno < 16) {
 323                        u32 *pal = fbi->fb.pseudo_palette;
 324
 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                        pal[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 */
 350static 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 */
 366static int
 367sa1100fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 368{
 369        struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
 370        int rgbidx;
 371
 372        if (var->xres < MIN_XRES)
 373                var->xres = MIN_XRES;
 374        if (var->yres < MIN_YRES)
 375                var->yres = MIN_YRES;
 376        if (var->xres > fbi->inf->xres)
 377                var->xres = fbi->inf->xres;
 378        if (var->yres > fbi->inf->yres)
 379                var->yres = fbi->inf->yres;
 380        var->xres_virtual = max(var->xres_virtual, var->xres);
 381        var->yres_virtual = max(var->yres_virtual, var->yres);
 382
 383        dev_dbg(fbi->dev, "var->bits_per_pixel=%d\n", var->bits_per_pixel);
 384        switch (var->bits_per_pixel) {
 385        case 4:
 386                rgbidx = RGB_4;
 387                break;
 388        case 8:
 389                rgbidx = RGB_8;
 390                break;
 391        case 16:
 392                rgbidx = RGB_16;
 393                break;
 394        default:
 395                return -EINVAL;
 396        }
 397
 398        /*
 399         * Copy the RGB parameters for this display
 400         * from the machine specific parameters.
 401         */
 402        var->red    = fbi->rgb[rgbidx]->red;
 403        var->green  = fbi->rgb[rgbidx]->green;
 404        var->blue   = fbi->rgb[rgbidx]->blue;
 405        var->transp = fbi->rgb[rgbidx]->transp;
 406
 407        dev_dbg(fbi->dev, "RGBT length = %d:%d:%d:%d\n",
 408                var->red.length, var->green.length, var->blue.length,
 409                var->transp.length);
 410
 411        dev_dbg(fbi->dev, "RGBT offset = %d:%d:%d:%d\n",
 412                var->red.offset, var->green.offset, var->blue.offset,
 413                var->transp.offset);
 414
 415#ifdef CONFIG_CPU_FREQ
 416        dev_dbg(fbi->dev, "dma period = %d ps, clock = %d kHz\n",
 417                sa1100fb_display_dma_period(var),
 418                cpufreq_get(smp_processor_id()));
 419#endif
 420
 421        return 0;
 422}
 423
 424static void sa1100fb_set_visual(struct sa1100fb_info *fbi, u32 visual)
 425{
 426        if (fbi->inf->set_visual)
 427                fbi->inf->set_visual(visual);
 428}
 429
 430/*
 431 * sa1100fb_set_par():
 432 *      Set the user defined part of the display for the specified console
 433 */
 434static int sa1100fb_set_par(struct fb_info *info)
 435{
 436        struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
 437        struct fb_var_screeninfo *var = &info->var;
 438        unsigned long palette_mem_size;
 439
 440        dev_dbg(fbi->dev, "set_par\n");
 441
 442        if (var->bits_per_pixel == 16)
 443                fbi->fb.fix.visual = FB_VISUAL_TRUECOLOR;
 444        else if (!fbi->inf->cmap_static)
 445                fbi->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR;
 446        else {
 447                /*
 448                 * Some people have weird ideas about wanting static
 449                 * pseudocolor maps.  I suspect their user space
 450                 * applications are broken.
 451                 */
 452                fbi->fb.fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR;
 453        }
 454
 455        fbi->fb.fix.line_length = var->xres_virtual *
 456                                  var->bits_per_pixel / 8;
 457        fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16;
 458
 459        palette_mem_size = fbi->palette_size * sizeof(u16);
 460
 461        dev_dbg(fbi->dev, "palette_mem_size = 0x%08lx\n", palette_mem_size);
 462
 463        fbi->palette_cpu = (u16 *)(fbi->map_cpu + PAGE_SIZE - palette_mem_size);
 464        fbi->palette_dma = fbi->map_dma + PAGE_SIZE - palette_mem_size;
 465
 466        /*
 467         * Set (any) board control register to handle new color depth
 468         */
 469        sa1100fb_set_visual(fbi, fbi->fb.fix.visual);
 470        sa1100fb_activate_var(var, fbi);
 471
 472        return 0;
 473}
 474
 475#if 0
 476static int
 477sa1100fb_set_cmap(struct fb_cmap *cmap, int kspc, int con,
 478                  struct fb_info *info)
 479{
 480        struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
 481
 482        /*
 483         * Make sure the user isn't doing something stupid.
 484         */
 485        if (!kspc && (fbi->fb.var.bits_per_pixel == 16 || fbi->inf->cmap_static))
 486                return -EINVAL;
 487
 488        return gen_set_cmap(cmap, kspc, con, info);
 489}
 490#endif
 491
 492/*
 493 * Formal definition of the VESA spec:
 494 *  On
 495 *      This refers to the state of the display when it is in full operation
 496 *  Stand-By
 497 *      This defines an optional operating state of minimal power reduction with
 498 *      the shortest recovery time
 499 *  Suspend
 500 *      This refers to a level of power management in which substantial power
 501 *      reduction is achieved by the display.  The display can have a longer 
 502 *      recovery time from this state than from the Stand-by state
 503 *  Off
 504 *      This indicates that the display is consuming the lowest level of power
 505 *      and is non-operational. Recovery from this state may optionally require
 506 *      the user to manually power on the monitor
 507 *
 508 *  Now, the fbdev driver adds an additional state, (blank), where they
 509 *  turn off the video (maybe by colormap tricks), but don't mess with the
 510 *  video itself: think of it semantically between on and Stand-By.
 511 *
 512 *  So here's what we should do in our fbdev blank routine:
 513 *
 514 *      VESA_NO_BLANKING (mode 0)       Video on,  front/back light on
 515 *      VESA_VSYNC_SUSPEND (mode 1)     Video on,  front/back light off
 516 *      VESA_HSYNC_SUSPEND (mode 2)     Video on,  front/back light off
 517 *      VESA_POWERDOWN (mode 3)         Video off, front/back light off
 518 *
 519 *  This will match the matrox implementation.
 520 */
 521/*
 522 * sa1100fb_blank():
 523 *      Blank the display by setting all palette values to zero.  Note, the 
 524 *      12 and 16 bpp modes don't really use the palette, so this will not
 525 *      blank the display in all modes.  
 526 */
 527static int sa1100fb_blank(int blank, struct fb_info *info)
 528{
 529        struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
 530        int i;
 531
 532        dev_dbg(fbi->dev, "sa1100fb_blank: blank=%d\n", blank);
 533
 534        switch (blank) {
 535        case FB_BLANK_POWERDOWN:
 536        case FB_BLANK_VSYNC_SUSPEND:
 537        case FB_BLANK_HSYNC_SUSPEND:
 538        case FB_BLANK_NORMAL:
 539                if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 540                    fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 541                        for (i = 0; i < fbi->palette_size; i++)
 542                                sa1100fb_setpalettereg(i, 0, 0, 0, 0, info);
 543                sa1100fb_schedule_work(fbi, C_DISABLE);
 544                break;
 545
 546        case FB_BLANK_UNBLANK:
 547                if (fbi->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR ||
 548                    fbi->fb.fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR)
 549                        fb_set_cmap(&fbi->fb.cmap, info);
 550                sa1100fb_schedule_work(fbi, C_ENABLE);
 551        }
 552        return 0;
 553}
 554
 555static int sa1100fb_mmap(struct fb_info *info,
 556                         struct vm_area_struct *vma)
 557{
 558        struct sa1100fb_info *fbi = (struct sa1100fb_info *)info;
 559        unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
 560
 561        if (off < info->fix.smem_len) {
 562                vma->vm_pgoff += 1; /* skip over the palette */
 563                return dma_mmap_writecombine(fbi->dev, vma, fbi->map_cpu,
 564                                             fbi->map_dma, fbi->map_size);
 565        }
 566
 567        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 568
 569        return vm_iomap_memory(vma, info->fix.mmio_start, info->fix.mmio_len);
 570}
 571
 572static struct fb_ops sa1100fb_ops = {
 573        .owner          = THIS_MODULE,
 574        .fb_check_var   = sa1100fb_check_var,
 575        .fb_set_par     = sa1100fb_set_par,
 576//      .fb_set_cmap    = sa1100fb_set_cmap,
 577        .fb_setcolreg   = sa1100fb_setcolreg,
 578        .fb_fillrect    = cfb_fillrect,
 579        .fb_copyarea    = cfb_copyarea,
 580        .fb_imageblit   = cfb_imageblit,
 581        .fb_blank       = sa1100fb_blank,
 582        .fb_mmap        = sa1100fb_mmap,
 583};
 584
 585/*
 586 * Calculate the PCD value from the clock rate (in picoseconds).
 587 * We take account of the PPCR clock setting.
 588 */
 589static inline unsigned int get_pcd(unsigned int pixclock, unsigned int cpuclock)
 590{
 591        unsigned int pcd = cpuclock / 100;
 592
 593        pcd *= pixclock;
 594        pcd /= 10000000;
 595
 596        return pcd + 1; /* make up for integer math truncations */
 597}
 598
 599/*
 600 * sa1100fb_activate_var():
 601 *      Configures LCD Controller based on entries in var parameter.  Settings are      
 602 *      only written to the controller if changes were made.  
 603 */
 604static int sa1100fb_activate_var(struct fb_var_screeninfo *var, struct sa1100fb_info *fbi)
 605{
 606        struct sa1100fb_lcd_reg new_regs;
 607        u_int half_screen_size, yres, pcd;
 608        u_long flags;
 609
 610        dev_dbg(fbi->dev, "Configuring SA1100 LCD\n");
 611
 612        dev_dbg(fbi->dev, "var: xres=%d hslen=%d lm=%d rm=%d\n",
 613                var->xres, var->hsync_len,
 614                var->left_margin, var->right_margin);
 615        dev_dbg(fbi->dev, "var: yres=%d vslen=%d um=%d bm=%d\n",
 616                var->yres, var->vsync_len,
 617                var->upper_margin, var->lower_margin);
 618
 619#if DEBUG_VAR
 620        if (var->xres < 16        || var->xres > 1024)
 621                dev_err(fbi->dev, "%s: invalid xres %d\n",
 622                        fbi->fb.fix.id, var->xres);
 623        if (var->hsync_len < 1    || var->hsync_len > 64)
 624                dev_err(fbi->dev, "%s: invalid hsync_len %d\n",
 625                        fbi->fb.fix.id, var->hsync_len);
 626        if (var->left_margin < 1  || var->left_margin > 255)
 627                dev_err(fbi->dev, "%s: invalid left_margin %d\n",
 628                        fbi->fb.fix.id, var->left_margin);
 629        if (var->right_margin < 1 || var->right_margin > 255)
 630                dev_err(fbi->dev, "%s: invalid right_margin %d\n",
 631                        fbi->fb.fix.id, var->right_margin);
 632        if (var->yres < 1         || var->yres > 1024)
 633                dev_err(fbi->dev, "%s: invalid yres %d\n",
 634                        fbi->fb.fix.id, var->yres);
 635        if (var->vsync_len < 1    || var->vsync_len > 64)
 636                dev_err(fbi->dev, "%s: invalid vsync_len %d\n",
 637                        fbi->fb.fix.id, var->vsync_len);
 638        if (var->upper_margin < 0 || var->upper_margin > 255)
 639                dev_err(fbi->dev, "%s: invalid upper_margin %d\n",
 640                        fbi->fb.fix.id, var->upper_margin);
 641        if (var->lower_margin < 0 || var->lower_margin > 255)
 642                dev_err(fbi->dev, "%s: invalid lower_margin %d\n",
 643                        fbi->fb.fix.id, var->lower_margin);
 644#endif
 645
 646        new_regs.lccr0 = fbi->inf->lccr0 |
 647                LCCR0_LEN | LCCR0_LDM | LCCR0_BAM |
 648                LCCR0_ERM | LCCR0_LtlEnd | LCCR0_DMADel(0);
 649
 650        new_regs.lccr1 =
 651                LCCR1_DisWdth(var->xres) +
 652                LCCR1_HorSnchWdth(var->hsync_len) +
 653                LCCR1_BegLnDel(var->left_margin) +
 654                LCCR1_EndLnDel(var->right_margin);
 655
 656        /*
 657         * If we have a dual scan LCD, then we need to halve
 658         * the YRES parameter.
 659         */
 660        yres = var->yres;
 661        if (fbi->inf->lccr0 & LCCR0_Dual)
 662                yres /= 2;
 663
 664        new_regs.lccr2 =
 665                LCCR2_DisHght(yres) +
 666                LCCR2_VrtSnchWdth(var->vsync_len) +
 667                LCCR2_BegFrmDel(var->upper_margin) +
 668                LCCR2_EndFrmDel(var->lower_margin);
 669
 670        pcd = get_pcd(var->pixclock, cpufreq_get(0));
 671        new_regs.lccr3 = LCCR3_PixClkDiv(pcd) | fbi->inf->lccr3 |
 672                (var->sync & FB_SYNC_HOR_HIGH_ACT ? LCCR3_HorSnchH : LCCR3_HorSnchL) |
 673                (var->sync & FB_SYNC_VERT_HIGH_ACT ? LCCR3_VrtSnchH : LCCR3_VrtSnchL);
 674
 675        dev_dbg(fbi->dev, "nlccr0 = 0x%08lx\n", new_regs.lccr0);
 676        dev_dbg(fbi->dev, "nlccr1 = 0x%08lx\n", new_regs.lccr1);
 677        dev_dbg(fbi->dev, "nlccr2 = 0x%08lx\n", new_regs.lccr2);
 678        dev_dbg(fbi->dev, "nlccr3 = 0x%08lx\n", new_regs.lccr3);
 679
 680        half_screen_size = var->bits_per_pixel;
 681        half_screen_size = half_screen_size * var->xres * var->yres / 16;
 682
 683        /* Update shadow copy atomically */
 684        local_irq_save(flags);
 685        fbi->dbar1 = fbi->palette_dma;
 686        fbi->dbar2 = fbi->screen_dma + half_screen_size;
 687
 688        fbi->reg_lccr0 = new_regs.lccr0;
 689        fbi->reg_lccr1 = new_regs.lccr1;
 690        fbi->reg_lccr2 = new_regs.lccr2;
 691        fbi->reg_lccr3 = new_regs.lccr3;
 692        local_irq_restore(flags);
 693
 694        /*
 695         * Only update the registers if the controller is enabled
 696         * and something has changed.
 697         */
 698        if (readl_relaxed(fbi->base + LCCR0) != fbi->reg_lccr0 ||
 699            readl_relaxed(fbi->base + LCCR1) != fbi->reg_lccr1 ||
 700            readl_relaxed(fbi->base + LCCR2) != fbi->reg_lccr2 ||
 701            readl_relaxed(fbi->base + LCCR3) != fbi->reg_lccr3 ||
 702            readl_relaxed(fbi->base + DBAR1) != fbi->dbar1 ||
 703            readl_relaxed(fbi->base + DBAR2) != fbi->dbar2)
 704                sa1100fb_schedule_work(fbi, C_REENABLE);
 705
 706        return 0;
 707}
 708
 709/*
 710 * NOTE!  The following functions are purely helpers for set_ctrlr_state.
 711 * Do not call them directly; set_ctrlr_state does the correct serialisation
 712 * to ensure that things happen in the right way 100% of time time.
 713 *      -- rmk
 714 */
 715static inline void __sa1100fb_backlight_power(struct sa1100fb_info *fbi, int on)
 716{
 717        dev_dbg(fbi->dev, "backlight o%s\n", on ? "n" : "ff");
 718
 719        if (fbi->inf->backlight_power)
 720                fbi->inf->backlight_power(on);
 721}
 722
 723static inline void __sa1100fb_lcd_power(struct sa1100fb_info *fbi, int on)
 724{
 725        dev_dbg(fbi->dev, "LCD power o%s\n", on ? "n" : "ff");
 726
 727        if (fbi->inf->lcd_power)
 728                fbi->inf->lcd_power(on);
 729}
 730
 731static void sa1100fb_setup_gpio(struct sa1100fb_info *fbi)
 732{
 733        u_int mask = 0;
 734
 735        /*
 736         * Enable GPIO<9:2> for LCD use if:
 737         *  1. Active display, or
 738         *  2. Color Dual Passive display
 739         *
 740         * see table 11.8 on page 11-27 in the SA1100 manual
 741         *   -- Erik.
 742         *
 743         * SA1110 spec update nr. 25 says we can and should
 744         * clear LDD15 to 12 for 4 or 8bpp modes with active
 745         * panels.  
 746         */
 747        if ((fbi->reg_lccr0 & LCCR0_CMS) == LCCR0_Color &&
 748            (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) != 0) {
 749                mask = GPIO_LDD11 | GPIO_LDD10 | GPIO_LDD9  | GPIO_LDD8;
 750
 751                if (fbi->fb.var.bits_per_pixel > 8 ||
 752                    (fbi->reg_lccr0 & (LCCR0_Dual|LCCR0_Act)) == LCCR0_Dual)
 753                        mask |= GPIO_LDD15 | GPIO_LDD14 | GPIO_LDD13 | GPIO_LDD12;
 754
 755        }
 756
 757        if (mask) {
 758                unsigned long flags;
 759
 760                /*
 761                 * SA-1100 requires the GPIO direction register set
 762                 * appropriately for the alternate function.  Hence
 763                 * we set it here via bitmask rather than excessive
 764                 * fiddling via the GPIO subsystem - and even then
 765                 * we'll still have to deal with GAFR.
 766                 */
 767                local_irq_save(flags);
 768                GPDR |= mask;
 769                GAFR |= mask;
 770                local_irq_restore(flags);
 771        }
 772}
 773
 774static void sa1100fb_enable_controller(struct sa1100fb_info *fbi)
 775{
 776        dev_dbg(fbi->dev, "Enabling LCD controller\n");
 777
 778        /*
 779         * Make sure the mode bits are present in the first palette entry
 780         */
 781        fbi->palette_cpu[0] &= 0xcfff;
 782        fbi->palette_cpu[0] |= palette_pbs(&fbi->fb.var);
 783
 784        /* Sequence from 11.7.10 */
 785        writel_relaxed(fbi->reg_lccr3, fbi->base + LCCR3);
 786        writel_relaxed(fbi->reg_lccr2, fbi->base + LCCR2);
 787        writel_relaxed(fbi->reg_lccr1, fbi->base + LCCR1);
 788        writel_relaxed(fbi->reg_lccr0 & ~LCCR0_LEN, fbi->base + LCCR0);
 789        writel_relaxed(fbi->dbar1, fbi->base + DBAR1);
 790        writel_relaxed(fbi->dbar2, fbi->base + DBAR2);
 791        writel_relaxed(fbi->reg_lccr0 | LCCR0_LEN, fbi->base + LCCR0);
 792
 793        if (machine_is_shannon())
 794                gpio_set_value(SHANNON_GPIO_DISP_EN, 1);
 795
 796        dev_dbg(fbi->dev, "DBAR1: 0x%08x\n", readl_relaxed(fbi->base + DBAR1));
 797        dev_dbg(fbi->dev, "DBAR2: 0x%08x\n", readl_relaxed(fbi->base + DBAR2));
 798        dev_dbg(fbi->dev, "LCCR0: 0x%08x\n", readl_relaxed(fbi->base + LCCR0));
 799        dev_dbg(fbi->dev, "LCCR1: 0x%08x\n", readl_relaxed(fbi->base + LCCR1));
 800        dev_dbg(fbi->dev, "LCCR2: 0x%08x\n", readl_relaxed(fbi->base + LCCR2));
 801        dev_dbg(fbi->dev, "LCCR3: 0x%08x\n", readl_relaxed(fbi->base + LCCR3));
 802}
 803
 804static void sa1100fb_disable_controller(struct sa1100fb_info *fbi)
 805{
 806        DECLARE_WAITQUEUE(wait, current);
 807        u32 lccr0;
 808
 809        dev_dbg(fbi->dev, "Disabling LCD controller\n");
 810
 811        if (machine_is_shannon())
 812                gpio_set_value(SHANNON_GPIO_DISP_EN, 0);
 813
 814        set_current_state(TASK_UNINTERRUPTIBLE);
 815        add_wait_queue(&fbi->ctrlr_wait, &wait);
 816
 817        /* Clear LCD Status Register */
 818        writel_relaxed(~0, fbi->base + LCSR);
 819
 820        lccr0 = readl_relaxed(fbi->base + LCCR0);
 821        lccr0 &= ~LCCR0_LDM;    /* Enable LCD Disable Done Interrupt */
 822        writel_relaxed(lccr0, fbi->base + LCCR0);
 823        lccr0 &= ~LCCR0_LEN;    /* Disable LCD Controller */
 824        writel_relaxed(lccr0, fbi->base + LCCR0);
 825
 826        schedule_timeout(20 * HZ / 1000);
 827        remove_wait_queue(&fbi->ctrlr_wait, &wait);
 828}
 829
 830/*
 831 *  sa1100fb_handle_irq: Handle 'LCD DONE' interrupts.
 832 */
 833static irqreturn_t sa1100fb_handle_irq(int irq, void *dev_id)
 834{
 835        struct sa1100fb_info *fbi = dev_id;
 836        unsigned int lcsr = readl_relaxed(fbi->base + LCSR);
 837
 838        if (lcsr & LCSR_LDD) {
 839                u32 lccr0 = readl_relaxed(fbi->base + LCCR0) | LCCR0_LDM;
 840                writel_relaxed(lccr0, fbi->base + LCCR0);
 841                wake_up(&fbi->ctrlr_wait);
 842        }
 843
 844        writel_relaxed(lcsr, fbi->base + LCSR);
 845        return IRQ_HANDLED;
 846}
 847
 848/*
 849 * This function must be called from task context only, since it will
 850 * sleep when disabling the LCD controller, or if we get two contending
 851 * processes trying to alter state.
 852 */
 853static void set_ctrlr_state(struct sa1100fb_info *fbi, u_int state)
 854{
 855        u_int old_state;
 856
 857        mutex_lock(&fbi->ctrlr_lock);
 858
 859        old_state = fbi->state;
 860
 861        /*
 862         * Hack around fbcon initialisation.
 863         */
 864        if (old_state == C_STARTUP && state == C_REENABLE)
 865                state = C_ENABLE;
 866
 867        switch (state) {
 868        case C_DISABLE_CLKCHANGE:
 869                /*
 870                 * Disable controller for clock change.  If the
 871                 * controller is already disabled, then do nothing.
 872                 */
 873                if (old_state != C_DISABLE && old_state != C_DISABLE_PM) {
 874                        fbi->state = state;
 875                        sa1100fb_disable_controller(fbi);
 876                }
 877                break;
 878
 879        case C_DISABLE_PM:
 880        case C_DISABLE:
 881                /*
 882                 * Disable controller
 883                 */
 884                if (old_state != C_DISABLE) {
 885                        fbi->state = state;
 886
 887                        __sa1100fb_backlight_power(fbi, 0);
 888                        if (old_state != C_DISABLE_CLKCHANGE)
 889                                sa1100fb_disable_controller(fbi);
 890                        __sa1100fb_lcd_power(fbi, 0);
 891                }
 892                break;
 893
 894        case C_ENABLE_CLKCHANGE:
 895                /*
 896                 * Enable the controller after clock change.  Only
 897                 * do this if we were disabled for the clock change.
 898                 */
 899                if (old_state == C_DISABLE_CLKCHANGE) {
 900                        fbi->state = C_ENABLE;
 901                        sa1100fb_enable_controller(fbi);
 902                }
 903                break;
 904
 905        case C_REENABLE:
 906                /*
 907                 * Re-enable the controller only if it was already
 908                 * enabled.  This is so we reprogram the control
 909                 * registers.
 910                 */
 911                if (old_state == C_ENABLE) {
 912                        sa1100fb_disable_controller(fbi);
 913                        sa1100fb_setup_gpio(fbi);
 914                        sa1100fb_enable_controller(fbi);
 915                }
 916                break;
 917
 918        case C_ENABLE_PM:
 919                /*
 920                 * Re-enable the controller after PM.  This is not
 921                 * perfect - think about the case where we were doing
 922                 * a clock change, and we suspended half-way through.
 923                 */
 924                if (old_state != C_DISABLE_PM)
 925                        break;
 926                /* fall through */
 927
 928        case C_ENABLE:
 929                /*
 930                 * Power up the LCD screen, enable controller, and
 931                 * turn on the backlight.
 932                 */
 933                if (old_state != C_ENABLE) {
 934                        fbi->state = C_ENABLE;
 935                        sa1100fb_setup_gpio(fbi);
 936                        __sa1100fb_lcd_power(fbi, 1);
 937                        sa1100fb_enable_controller(fbi);
 938                        __sa1100fb_backlight_power(fbi, 1);
 939                }
 940                break;
 941        }
 942        mutex_unlock(&fbi->ctrlr_lock);
 943}
 944
 945/*
 946 * Our LCD controller task (which is called when we blank or unblank)
 947 * via keventd.
 948 */
 949static void sa1100fb_task(struct work_struct *w)
 950{
 951        struct sa1100fb_info *fbi = container_of(w, struct sa1100fb_info, task);
 952        u_int state = xchg(&fbi->task_state, -1);
 953
 954        set_ctrlr_state(fbi, state);
 955}
 956
 957#ifdef CONFIG_CPU_FREQ
 958/*
 959 * Calculate the minimum DMA period over all displays that we own.
 960 * This, together with the SDRAM bandwidth defines the slowest CPU
 961 * frequency that can be selected.
 962 */
 963static unsigned int sa1100fb_min_dma_period(struct sa1100fb_info *fbi)
 964{
 965#if 0
 966        unsigned int min_period = (unsigned int)-1;
 967        int i;
 968
 969        for (i = 0; i < MAX_NR_CONSOLES; i++) {
 970                struct display *disp = &fb_display[i];
 971                unsigned int period;
 972
 973                /*
 974                 * Do we own this display?
 975                 */
 976                if (disp->fb_info != &fbi->fb)
 977                        continue;
 978
 979                /*
 980                 * Ok, calculate its DMA period
 981                 */
 982                period = sa1100fb_display_dma_period(&disp->var);
 983                if (period < min_period)
 984                        min_period = period;
 985        }
 986
 987        return min_period;
 988#else
 989        /*
 990         * FIXME: we need to verify _all_ consoles.
 991         */
 992        return sa1100fb_display_dma_period(&fbi->fb.var);
 993#endif
 994}
 995
 996/*
 997 * CPU clock speed change handler.  We need to adjust the LCD timing
 998 * parameters when the CPU clock is adjusted by the power management
 999 * subsystem.
1000 */
1001static int
1002sa1100fb_freq_transition(struct notifier_block *nb, unsigned long val,
1003                         void *data)
1004{
1005        struct sa1100fb_info *fbi = TO_INF(nb, freq_transition);
1006        struct cpufreq_freqs *f = data;
1007        u_int pcd;
1008
1009        switch (val) {
1010        case CPUFREQ_PRECHANGE:
1011                set_ctrlr_state(fbi, C_DISABLE_CLKCHANGE);
1012                break;
1013
1014        case CPUFREQ_POSTCHANGE:
1015                pcd = get_pcd(fbi->fb.var.pixclock, f->new);
1016                fbi->reg_lccr3 = (fbi->reg_lccr3 & ~0xff) | LCCR3_PixClkDiv(pcd);
1017                set_ctrlr_state(fbi, C_ENABLE_CLKCHANGE);
1018                break;
1019        }
1020        return 0;
1021}
1022
1023static int
1024sa1100fb_freq_policy(struct notifier_block *nb, unsigned long val,
1025                     void *data)
1026{
1027        struct sa1100fb_info *fbi = TO_INF(nb, freq_policy);
1028        struct cpufreq_policy *policy = data;
1029
1030        switch (val) {
1031        case CPUFREQ_ADJUST:
1032        case CPUFREQ_INCOMPATIBLE:
1033                dev_dbg(fbi->dev, "min dma period: %d ps, "
1034                        "new clock %d kHz\n", sa1100fb_min_dma_period(fbi),
1035                        policy->max);
1036                /* todo: fill in min/max values */
1037                break;
1038        case CPUFREQ_NOTIFY:
1039                do {} while(0);
1040                /* todo: panic if min/max values aren't fulfilled 
1041                 * [can't really happen unless there's a bug in the
1042                 * CPU policy verififcation process *
1043                 */
1044                break;
1045        }
1046        return 0;
1047}
1048#endif
1049
1050#ifdef CONFIG_PM
1051/*
1052 * Power management hooks.  Note that we won't be called from IRQ context,
1053 * unlike the blank functions above, so we may sleep.
1054 */
1055static int sa1100fb_suspend(struct platform_device *dev, pm_message_t state)
1056{
1057        struct sa1100fb_info *fbi = platform_get_drvdata(dev);
1058
1059        set_ctrlr_state(fbi, C_DISABLE_PM);
1060        return 0;
1061}
1062
1063static int sa1100fb_resume(struct platform_device *dev)
1064{
1065        struct sa1100fb_info *fbi = platform_get_drvdata(dev);
1066
1067        set_ctrlr_state(fbi, C_ENABLE_PM);
1068        return 0;
1069}
1070#else
1071#define sa1100fb_suspend        NULL
1072#define sa1100fb_resume         NULL
1073#endif
1074
1075/*
1076 * sa1100fb_map_video_memory():
1077 *      Allocates the DRAM memory for the frame buffer.  This buffer is  
1078 *      remapped into a non-cached, non-buffered, memory region to  
1079 *      allow palette and pixel writes to occur without flushing the 
1080 *      cache.  Once this area is remapped, all virtual memory
1081 *      access to the video memory should occur at the new region.
1082 */
1083static int sa1100fb_map_video_memory(struct sa1100fb_info *fbi)
1084{
1085        /*
1086         * We reserve one page for the palette, plus the size
1087         * of the framebuffer.
1088         */
1089        fbi->map_size = PAGE_ALIGN(fbi->fb.fix.smem_len + PAGE_SIZE);
1090        fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size,
1091                                              &fbi->map_dma, GFP_KERNEL);
1092
1093        if (fbi->map_cpu) {
1094                fbi->fb.screen_base = fbi->map_cpu + PAGE_SIZE;
1095                fbi->screen_dma = fbi->map_dma + PAGE_SIZE;
1096                /*
1097                 * FIXME: this is actually the wrong thing to place in
1098                 * smem_start.  But fbdev suffers from the problem that
1099                 * it needs an API which doesn't exist (in this case,
1100                 * dma_writecombine_mmap)
1101                 */
1102                fbi->fb.fix.smem_start = fbi->screen_dma;
1103        }
1104
1105        return fbi->map_cpu ? 0 : -ENOMEM;
1106}
1107
1108/* Fake monspecs to fill in fbinfo structure */
1109static struct fb_monspecs monspecs = {
1110        .hfmin  = 30000,
1111        .hfmax  = 70000,
1112        .vfmin  = 50,
1113        .vfmax  = 65,
1114};
1115
1116
1117static struct sa1100fb_info *sa1100fb_init_fbinfo(struct device *dev)
1118{
1119        struct sa1100fb_mach_info *inf = dev_get_platdata(dev);
1120        struct sa1100fb_info *fbi;
1121        unsigned i;
1122
1123        fbi = kmalloc(sizeof(struct sa1100fb_info) + sizeof(u32) * 16,
1124                      GFP_KERNEL);
1125        if (!fbi)
1126                return NULL;
1127
1128        memset(fbi, 0, sizeof(struct sa1100fb_info));
1129        fbi->dev = dev;
1130
1131        strcpy(fbi->fb.fix.id, SA1100_NAME);
1132
1133        fbi->fb.fix.type        = FB_TYPE_PACKED_PIXELS;
1134        fbi->fb.fix.type_aux    = 0;
1135        fbi->fb.fix.xpanstep    = 0;
1136        fbi->fb.fix.ypanstep    = 0;
1137        fbi->fb.fix.ywrapstep   = 0;
1138        fbi->fb.fix.accel       = FB_ACCEL_NONE;
1139
1140        fbi->fb.var.nonstd      = 0;
1141        fbi->fb.var.activate    = FB_ACTIVATE_NOW;
1142        fbi->fb.var.height      = -1;
1143        fbi->fb.var.width       = -1;
1144        fbi->fb.var.accel_flags = 0;
1145        fbi->fb.var.vmode       = FB_VMODE_NONINTERLACED;
1146
1147        fbi->fb.fbops           = &sa1100fb_ops;
1148        fbi->fb.flags           = FBINFO_DEFAULT;
1149        fbi->fb.monspecs        = monspecs;
1150        fbi->fb.pseudo_palette  = (fbi + 1);
1151
1152        fbi->rgb[RGB_4]         = &rgb_4;
1153        fbi->rgb[RGB_8]         = &rgb_8;
1154        fbi->rgb[RGB_16]        = &def_rgb_16;
1155
1156        /*
1157         * People just don't seem to get this.  We don't support
1158         * anything but correct entries now, so panic if someone
1159         * does something stupid.
1160         */
1161        if (inf->lccr3 & (LCCR3_VrtSnchL|LCCR3_HorSnchL|0xff) ||
1162            inf->pixclock == 0)
1163                panic("sa1100fb error: invalid LCCR3 fields set or zero "
1164                        "pixclock.");
1165
1166        fbi->fb.var.xres                = inf->xres;
1167        fbi->fb.var.xres_virtual        = inf->xres;
1168        fbi->fb.var.yres                = inf->yres;
1169        fbi->fb.var.yres_virtual        = inf->yres;
1170        fbi->fb.var.bits_per_pixel      = inf->bpp;
1171        fbi->fb.var.pixclock            = inf->pixclock;
1172        fbi->fb.var.hsync_len           = inf->hsync_len;
1173        fbi->fb.var.left_margin         = inf->left_margin;
1174        fbi->fb.var.right_margin        = inf->right_margin;
1175        fbi->fb.var.vsync_len           = inf->vsync_len;
1176        fbi->fb.var.upper_margin        = inf->upper_margin;
1177        fbi->fb.var.lower_margin        = inf->lower_margin;
1178        fbi->fb.var.sync                = inf->sync;
1179        fbi->fb.var.grayscale           = inf->cmap_greyscale;
1180        fbi->state                      = C_STARTUP;
1181        fbi->task_state                 = (u_char)-1;
1182        fbi->fb.fix.smem_len            = inf->xres * inf->yres *
1183                                          inf->bpp / 8;
1184        fbi->inf                        = inf;
1185
1186        /* Copy the RGB bitfield overrides */
1187        for (i = 0; i < NR_RGB; i++)
1188                if (inf->rgb[i])
1189                        fbi->rgb[i] = inf->rgb[i];
1190
1191        init_waitqueue_head(&fbi->ctrlr_wait);
1192        INIT_WORK(&fbi->task, sa1100fb_task);
1193        mutex_init(&fbi->ctrlr_lock);
1194
1195        return fbi;
1196}
1197
1198static int sa1100fb_probe(struct platform_device *pdev)
1199{
1200        struct sa1100fb_info *fbi;
1201        struct resource *res;
1202        int ret, irq;
1203
1204        if (!dev_get_platdata(&pdev->dev)) {
1205                dev_err(&pdev->dev, "no platform LCD data\n");
1206                return -EINVAL;
1207        }
1208
1209        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1210        irq = platform_get_irq(pdev, 0);
1211        if (irq < 0 || !res)
1212                return -EINVAL;
1213
1214        if (!request_mem_region(res->start, resource_size(res), "LCD"))
1215                return -EBUSY;
1216
1217        fbi = sa1100fb_init_fbinfo(&pdev->dev);
1218        ret = -ENOMEM;
1219        if (!fbi)
1220                goto failed;
1221
1222        fbi->base = ioremap(res->start, resource_size(res));
1223        if (!fbi->base)
1224                goto failed;
1225
1226        /* Initialize video memory */
1227        ret = sa1100fb_map_video_memory(fbi);
1228        if (ret)
1229                goto failed;
1230
1231        ret = request_irq(irq, sa1100fb_handle_irq, 0, "LCD", fbi);
1232        if (ret) {
1233                dev_err(&pdev->dev, "request_irq failed: %d\n", ret);
1234                goto failed;
1235        }
1236
1237        if (machine_is_shannon()) {
1238                ret = gpio_request_one(SHANNON_GPIO_DISP_EN,
1239                        GPIOF_OUT_INIT_LOW, "display enable");
1240                if (ret)
1241                        goto err_free_irq;
1242        }
1243
1244        /*
1245         * This makes sure that our colour bitfield
1246         * descriptors are correctly initialised.
1247         */
1248        sa1100fb_check_var(&fbi->fb.var, &fbi->fb);
1249
1250        platform_set_drvdata(pdev, fbi);
1251
1252        ret = register_framebuffer(&fbi->fb);
1253        if (ret < 0)
1254                goto err_reg_fb;
1255
1256#ifdef CONFIG_CPU_FREQ
1257        fbi->freq_transition.notifier_call = sa1100fb_freq_transition;
1258        fbi->freq_policy.notifier_call = sa1100fb_freq_policy;
1259        cpufreq_register_notifier(&fbi->freq_transition, CPUFREQ_TRANSITION_NOTIFIER);
1260        cpufreq_register_notifier(&fbi->freq_policy, CPUFREQ_POLICY_NOTIFIER);
1261#endif
1262
1263        /* This driver cannot be unloaded at the moment */
1264        return 0;
1265
1266 err_reg_fb:
1267        if (machine_is_shannon())
1268                gpio_free(SHANNON_GPIO_DISP_EN);
1269 err_free_irq:
1270        free_irq(irq, fbi);
1271 failed:
1272        if (fbi)
1273                iounmap(fbi->base);
1274        kfree(fbi);
1275        release_mem_region(res->start, resource_size(res));
1276        return ret;
1277}
1278
1279static struct platform_driver sa1100fb_driver = {
1280        .probe          = sa1100fb_probe,
1281        .suspend        = sa1100fb_suspend,
1282        .resume         = sa1100fb_resume,
1283        .driver         = {
1284                .name   = "sa11x0-fb",
1285                .owner  = THIS_MODULE,
1286        },
1287};
1288
1289int __init sa1100fb_init(void)
1290{
1291        if (fb_get_options("sa1100fb", NULL))
1292                return -ENODEV;
1293
1294        return platform_driver_register(&sa1100fb_driver);
1295}
1296
1297int __init sa1100fb_setup(char *options)
1298{
1299#if 0
1300        char *this_opt;
1301
1302        if (!options || !*options)
1303                return 0;
1304
1305        while ((this_opt = strsep(&options, ",")) != NULL) {
1306
1307                if (!strncmp(this_opt, "bpp:", 4))
1308                        current_par.max_bpp =
1309                            simple_strtoul(this_opt + 4, NULL, 0);
1310
1311                if (!strncmp(this_opt, "lccr0:", 6))
1312                        lcd_shadow.lccr0 =
1313                            simple_strtoul(this_opt + 6, NULL, 0);
1314                if (!strncmp(this_opt, "lccr1:", 6)) {
1315                        lcd_shadow.lccr1 =
1316                            simple_strtoul(this_opt + 6, NULL, 0);
1317                        current_par.max_xres =
1318                            (lcd_shadow.lccr1 & 0x3ff) + 16;
1319                }
1320                if (!strncmp(this_opt, "lccr2:", 6)) {
1321                        lcd_shadow.lccr2 =
1322                            simple_strtoul(this_opt + 6, NULL, 0);
1323                        current_par.max_yres =
1324                            (lcd_shadow.
1325                             lccr0 & LCCR0_SDS) ? ((lcd_shadow.
1326                                                    lccr2 & 0x3ff) +
1327                                                   1) *
1328                            2 : ((lcd_shadow.lccr2 & 0x3ff) + 1);
1329                }
1330                if (!strncmp(this_opt, "lccr3:", 6))
1331                        lcd_shadow.lccr3 =
1332                            simple_strtoul(this_opt + 6, NULL, 0);
1333        }
1334#endif
1335        return 0;
1336}
1337
1338module_init(sa1100fb_init);
1339MODULE_DESCRIPTION("StrongARM-1100/1110 framebuffer driver");
1340MODULE_LICENSE("GPL");
1341
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