drivers/video/sh_mobile_lcdcfb.c

   1 /*
   2  * SuperH Mobile LCDC Framebuffer
   3  *
   4  * Copyright (c) 2008 Magnus Damm
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/delay.h>
  14 #include <linux/mm.h>
  15 #include <linux/clk.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/dma-mapping.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/vmalloc.h>
  21 #include <linux/ioctl.h>
  22 #include <linux/slab.h>
  23 #include <linux/console.h>
  24 #include <video/sh_mobile_lcdc.h>
  25 #include <asm/atomic.h>
  26
  27 #include "sh_mobile_lcdcfb.h"
  28
  29 #define SIDE_B_OFFSET 0x1000
  30 #define MIRROR_OFFSET 0x2000
  31
  32 /* shared registers */
  33 #define _LDDCKR 0x410
  34 #define _LDDCKSTPR 0x414
  35 #define _LDINTR 0x468
  36 #define _LDSR 0x46c
  37 #define _LDCNT1R 0x470
  38 #define _LDCNT2R 0x474
  39 #define _LDRCNTR 0x478
  40 #define _LDDDSR 0x47c
  41 #define _LDDWD0R 0x800
  42 #define _LDDRDR 0x840
  43 #define _LDDWAR 0x900
  44 #define _LDDRAR 0x904
  45
  46 /* shared registers and their order for context save/restore */
  47 static int lcdc_shared_regs[] = {
  48         _LDDCKR,
  49         _LDDCKSTPR,
  50         _LDINTR,
  51         _LDDDSR,
  52         _LDCNT1R,
  53         _LDCNT2R,
  54 };
  55 #define NR_SHARED_REGS ARRAY_SIZE(lcdc_shared_regs)
  56
  57 #define DEFAULT_XRES 1280
  58 #define DEFAULT_YRES 1024
  59
  60 static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
  61         [LDDCKPAT1R] = 0x400,
  62         [LDDCKPAT2R] = 0x404,
  63         [LDMT1R] = 0x418,
  64         [LDMT2R] = 0x41c,
  65         [LDMT3R] = 0x420,
  66         [LDDFR] = 0x424,
  67         [LDSM1R] = 0x428,
  68         [LDSM2R] = 0x42c,
  69         [LDSA1R] = 0x430,
  70         [LDMLSR] = 0x438,
  71         [LDHCNR] = 0x448,
  72         [LDHSYNR] = 0x44c,
  73         [LDVLNR] = 0x450,
  74         [LDVSYNR] = 0x454,
  75         [LDPMR] = 0x460,
  76         [LDHAJR] = 0x4a0,
  77 };
  78
  79 static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
  80         [LDDCKPAT1R] = 0x408,
  81         [LDDCKPAT2R] = 0x40c,
  82         [LDMT1R] = 0x600,
  83         [LDMT2R] = 0x604,
  84         [LDMT3R] = 0x608,
  85         [LDDFR] = 0x60c,
  86         [LDSM1R] = 0x610,
  87         [LDSM2R] = 0x614,
  88         [LDSA1R] = 0x618,
  89         [LDMLSR] = 0x620,
  90         [LDHCNR] = 0x624,
  91         [LDHSYNR] = 0x628,
  92         [LDVLNR] = 0x62c,
  93         [LDVSYNR] = 0x630,
  94         [LDPMR] = 0x63c,
  95 };
  96
  97 #define START_LCDC      0x00000001
  98 #define LCDC_RESET      0x00000100
  99 #define DISPLAY_BEU     0x00000008
 100 #define LCDC_ENABLE     0x00000001
 101 #define LDINTR_FE       0x00000400
 102 #define LDINTR_VSE      0x00000200
 103 #define LDINTR_VEE      0x00000100
 104 #define LDINTR_FS       0x00000004
 105 #define LDINTR_VSS      0x00000002
 106 #define LDINTR_VES      0x00000001
 107 #define LDRCNTR_SRS     0x00020000
 108 #define LDRCNTR_SRC     0x00010000
 109 #define LDRCNTR_MRS     0x00000002
 110 #define LDRCNTR_MRC     0x00000001
 111 #define LDSR_MRS        0x00000100
 112
 113 static const struct fb_videomode default_720p = {
 114         .name = "HDMI 720p",
 115         .xres = 1280,
 116         .yres = 720,
 117
 118         .left_margin = 200,
 119         .right_margin = 88,
 120         .hsync_len = 48,
 121
 122         .upper_margin = 20,
 123         .lower_margin = 5,
 124         .vsync_len = 5,
 125
 126         .pixclock = 13468,
 127         .sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_HOR_HIGH_ACT,
 128 };
 129
 130 struct sh_mobile_lcdc_priv {
 131         void __iomem *base;
 132         int irq;
 133         atomic_t hw_usecnt;
 134         struct device *dev;
 135         struct clk *dot_clk;
 136         unsigned long lddckr;
 137         struct sh_mobile_lcdc_chan ch[2];
 138         struct notifier_block notifier;
 139         unsigned long saved_shared_regs[NR_SHARED_REGS];
 140         int started;
 141 };
 142
 143 static bool banked(int reg_nr)
 144 {
 145         switch (reg_nr) {
 146         case LDMT1R:
 147         case LDMT2R:
 148         case LDMT3R:
 149         case LDDFR:
 150         case LDSM1R:
 151         case LDSA1R:
 152         case LDMLSR:
 153         case LDHCNR:
 154         case LDHSYNR:
 155         case LDVLNR:
 156         case LDVSYNR:
 157                 return true;
 158         }
 159         return false;
 160 }
 161
 162 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
 163                             int reg_nr, unsigned long data)
 164 {
 165         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
 166         if (banked(reg_nr))
 167                 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
 168                           SIDE_B_OFFSET);
 169 }
 170
 171 static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
 172                             int reg_nr, unsigned long data)
 173 {
 174         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
 175                   MIRROR_OFFSET);
 176 }
 177
 178 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
 179                                     int reg_nr)
 180 {
 181         return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
 182 }
 183
 184 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
 185                        unsigned long reg_offs, unsigned long data)
 186 {
 187         iowrite32(data, priv->base + reg_offs);
 188 }
 189
 190 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
 191                                unsigned long reg_offs)
 192 {
 193         return ioread32(priv->base + reg_offs);
 194 }
 195
 196 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
 197                           unsigned long reg_offs,
 198                           unsigned long mask, unsigned long until)
 199 {
 200         while ((lcdc_read(priv, reg_offs) & mask) != until)
 201                 cpu_relax();
 202 }
 203
 204 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
 205 {
 206         return chan->cfg.chan == LCDC_CHAN_SUBLCD;
 207 }
 208
 209 static void lcdc_sys_write_index(void *handle, unsigned long data)
 210 {
 211         struct sh_mobile_lcdc_chan *ch = handle;
 212
 213         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
 214         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 215         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 216         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 217 }
 218
 219 static void lcdc_sys_write_data(void *handle, unsigned long data)
 220 {
 221         struct sh_mobile_lcdc_chan *ch = handle;
 222
 223         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
 224         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 225         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 226         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 227 }
 228
 229 static unsigned long lcdc_sys_read_data(void *handle)
 230 {
 231         struct sh_mobile_lcdc_chan *ch = handle;
 232
 233         lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
 234         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 235         lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 236         udelay(1);
 237         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 238
 239         return lcdc_read(ch->lcdc, _LDDRDR) & 0x3ffff;
 240 }
 241
 242 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
 243         lcdc_sys_write_index,
 244         lcdc_sys_write_data,
 245         lcdc_sys_read_data,
 246 };
 247
 248 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
 249 {
 250         if (atomic_inc_and_test(&priv->hw_usecnt)) {
 251                 pm_runtime_get_sync(priv->dev);
 252                 if (priv->dot_clk)
 253                         clk_enable(priv->dot_clk);
 254         }
 255 }
 256
 257 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
 258 {
 259         if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
 260                 if (priv->dot_clk)
 261                         clk_disable(priv->dot_clk);
 262                 pm_runtime_put(priv->dev);
 263         }
 264 }
 265
 266 static int sh_mobile_lcdc_sginit(struct fb_info *info,
 267                                   struct list_head *pagelist)
 268 {
 269         struct sh_mobile_lcdc_chan *ch = info->par;
 270         unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
 271         struct page *page;
 272         int nr_pages = 0;
 273
 274         sg_init_table(ch->sglist, nr_pages_max);
 275
 276         list_for_each_entry(page, pagelist, lru)
 277                 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
 278
 279         return nr_pages;
 280 }
 281
 282 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
 283                                        struct list_head *pagelist)
 284 {
 285         struct sh_mobile_lcdc_chan *ch = info->par;
 286         struct sh_mobile_lcdc_board_cfg *bcfg = &ch->cfg.board_cfg;
 287
 288         /* enable clocks before accessing hardware */
 289         sh_mobile_lcdc_clk_on(ch->lcdc);
 290
 291         /*
 292          * It's possible to get here without anything on the pagelist via
 293          * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
 294          * invocation. In the former case, the acceleration routines are
 295          * stepped in to when using the framebuffer console causing the
 296          * workqueue to be scheduled without any dirty pages on the list.
 297          *
 298          * Despite this, a panel update is still needed given that the
 299          * acceleration routines have their own methods for writing in
 300          * that still need to be updated.
 301          *
 302          * The fsync() and empty pagelist case could be optimized for,
 303          * but we don't bother, as any application exhibiting such
 304          * behaviour is fundamentally broken anyways.
 305          */
 306         if (!list_empty(pagelist)) {
 307                 unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
 308
 309                 /* trigger panel update */
 310                 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
 311                 if (bcfg->start_transfer)
 312                         bcfg->start_transfer(bcfg->board_data, ch,
 313                                              &sh_mobile_lcdc_sys_bus_ops);
 314                 lcdc_write_chan(ch, LDSM2R, 1);
 315                 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
 316         } else {
 317                 if (bcfg->start_transfer)
 318                         bcfg->start_transfer(bcfg->board_data, ch,
 319                                              &sh_mobile_lcdc_sys_bus_ops);
 320                 lcdc_write_chan(ch, LDSM2R, 1);
 321         }
 322 }
 323
 324 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
 325 {
 326         struct fb_deferred_io *fbdefio = info->fbdefio;
 327
 328         if (fbdefio)
 329                 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
 330 }
 331
 332 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
 333 {
 334         struct sh_mobile_lcdc_priv *priv = data;
 335         struct sh_mobile_lcdc_chan *ch;
 336         unsigned long tmp;
 337         unsigned long ldintr;
 338         int is_sub;
 339         int k;
 340
 341         /* acknowledge interrupt */
 342         ldintr = tmp = lcdc_read(priv, _LDINTR);
 343         /*
 344          * disable further VSYNC End IRQs, preserve all other enabled IRQs,
 345          * write 0 to bits 0-6 to ack all triggered IRQs.
 346          */
 347         tmp &= 0xffffff00 & ~LDINTR_VEE;
 348         lcdc_write(priv, _LDINTR, tmp);
 349
 350         /* figure out if this interrupt is for main or sub lcd */
 351         is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
 352
 353         /* wake up channel and disable clocks */
 354         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 355                 ch = &priv->ch[k];
 356
 357                 if (!ch->enabled)
 358                         continue;
 359
 360                 /* Frame Start */
 361                 if (ldintr & LDINTR_FS) {
 362                         if (is_sub == lcdc_chan_is_sublcd(ch)) {
 363                                 ch->frame_end = 1;
 364                                 wake_up(&ch->frame_end_wait);
 365
 366                                 sh_mobile_lcdc_clk_off(priv);
 367                         }
 368                 }
 369
 370                 /* VSYNC End */
 371                 if (ldintr & LDINTR_VES)
 372                         complete(&ch->vsync_completion);
 373         }
 374
 375         return IRQ_HANDLED;
 376 }
 377
 378 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
 379                                       int start)
 380 {
 381         unsigned long tmp = lcdc_read(priv, _LDCNT2R);
 382         int k;
 383
 384         /* start or stop the lcdc */
 385         if (start)
 386                 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
 387         else
 388                 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
 389
 390         /* wait until power is applied/stopped on all channels */
 391         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 392                 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
 393                         while (1) {
 394                                 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
 395                                 if (start && tmp == 3)
 396                                         break;
 397                                 if (!start && tmp == 0)
 398                                         break;
 399                                 cpu_relax();
 400                         }
 401
 402         if (!start)
 403                 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
 404 }
 405
 406 static void sh_mobile_lcdc_geometry(struct sh_mobile_lcdc_chan *ch)
 407 {
 408         struct fb_var_screeninfo *var = &ch->info->var, *display_var = &ch->display_var;
 409         unsigned long h_total, hsync_pos, display_h_total;
 410         u32 tmp;
 411
 412         tmp = ch->ldmt1r_value;
 413         tmp |= (var->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
 414         tmp |= (var->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
 415         tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
 416         tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
 417         tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
 418         tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
 419         tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
 420         lcdc_write_chan(ch, LDMT1R, tmp);
 421
 422         /* setup SYS bus */
 423         lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
 424         lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
 425
 426         /* horizontal configuration */
 427         h_total = display_var->xres + display_var->hsync_len +
 428                 display_var->left_margin + display_var->right_margin;
 429         tmp = h_total / 8; /* HTCN */
 430         tmp |= (min(display_var->xres, var->xres) / 8) << 16; /* HDCN */
 431         lcdc_write_chan(ch, LDHCNR, tmp);
 432
 433         hsync_pos = display_var->xres + display_var->right_margin;
 434         tmp = hsync_pos / 8; /* HSYNP */
 435         tmp |= (display_var->hsync_len / 8) << 16; /* HSYNW */
 436         lcdc_write_chan(ch, LDHSYNR, tmp);
 437
 438         /* vertical configuration */
 439         tmp = display_var->yres + display_var->vsync_len +
 440                 display_var->upper_margin + display_var->lower_margin; /* VTLN */
 441         tmp |= min(display_var->yres, var->yres) << 16; /* VDLN */
 442         lcdc_write_chan(ch, LDVLNR, tmp);
 443
 444         tmp = display_var->yres + display_var->lower_margin; /* VSYNP */
 445         tmp |= display_var->vsync_len << 16; /* VSYNW */
 446         lcdc_write_chan(ch, LDVSYNR, tmp);
 447
 448         /* Adjust horizontal synchronisation for HDMI */
 449         display_h_total = display_var->xres + display_var->hsync_len +
 450                 display_var->left_margin + display_var->right_margin;
 451         tmp = ((display_var->xres & 7) << 24) |
 452                 ((display_h_total & 7) << 16) |
 453                 ((display_var->hsync_len & 7) << 8) |
 454                 hsync_pos;
 455         lcdc_write_chan(ch, LDHAJR, tmp);
 456 }
 457
 458 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
 459 {
 460         struct sh_mobile_lcdc_chan *ch;
 461         struct sh_mobile_lcdc_board_cfg *board_cfg;
 462         unsigned long tmp;
 463         int k, m;
 464         int ret = 0;
 465
 466         /* enable clocks before accessing the hardware */
 467         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 468                 if (priv->ch[k].enabled)
 469                         sh_mobile_lcdc_clk_on(priv);
 470
 471         /* reset */
 472         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
 473         lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
 474
 475         /* enable LCDC channels */
 476         tmp = lcdc_read(priv, _LDCNT2R);
 477         tmp |= priv->ch[0].enabled;
 478         tmp |= priv->ch[1].enabled;
 479         lcdc_write(priv, _LDCNT2R, tmp);
 480
 481         /* read data from external memory, avoid using the BEU for now */
 482         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
 483
 484         /* stop the lcdc first */
 485         sh_mobile_lcdc_start_stop(priv, 0);
 486
 487         /* configure clocks */
 488         tmp = priv->lddckr;
 489         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 490                 ch = &priv->ch[k];
 491
 492                 if (!priv->ch[k].enabled)
 493                         continue;
 494
 495                 m = ch->cfg.clock_divider;
 496                 if (!m)
 497                         continue;
 498
 499                 if (m == 1)
 500                         m = 1 << 6;
 501                 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
 502
 503                 /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider denominator */
 504                 lcdc_write_chan(ch, LDDCKPAT1R, 0);
 505                 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
 506         }
 507
 508         lcdc_write(priv, _LDDCKR, tmp);
 509
 510         /* start dotclock again */
 511         lcdc_write(priv, _LDDCKSTPR, 0);
 512         lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
 513
 514         /* interrupts are disabled to begin with */
 515         lcdc_write(priv, _LDINTR, 0);
 516
 517         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 518                 ch = &priv->ch[k];
 519
 520                 if (!ch->enabled)
 521                         continue;
 522
 523                 sh_mobile_lcdc_geometry(ch);
 524
 525                 /* power supply */
 526                 lcdc_write_chan(ch, LDPMR, 0);
 527
 528                 board_cfg = &ch->cfg.board_cfg;
 529                 if (board_cfg->setup_sys)
 530                         ret = board_cfg->setup_sys(board_cfg->board_data, ch,
 531                                                    &sh_mobile_lcdc_sys_bus_ops);
 532                 if (ret)
 533                         return ret;
 534         }
 535
 536         /* word and long word swap */
 537         lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
 538
 539         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 540                 ch = &priv->ch[k];
 541
 542                 if (!priv->ch[k].enabled)
 543                         continue;
 544
 545                 /* set bpp format in PKF[4:0] */
 546                 tmp = lcdc_read_chan(ch, LDDFR);
 547                 tmp &= ~0x0001001f;
 548                 tmp |= (ch->info->var.bits_per_pixel == 16) ? 3 : 0;
 549                 lcdc_write_chan(ch, LDDFR, tmp);
 550
 551                 /* point out our frame buffer */
 552                 lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);
 553
 554                 /* set line size */
 555                 lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
 556
 557                 /* setup deferred io if SYS bus */
 558                 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
 559                 if (ch->ldmt1r_value & (1 << 12) && tmp) {
 560                         ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
 561                         ch->defio.delay = msecs_to_jiffies(tmp);
 562                         ch->info->fbdefio = &ch->defio;
 563                         fb_deferred_io_init(ch->info);
 564
 565                         /* one-shot mode */
 566                         lcdc_write_chan(ch, LDSM1R, 1);
 567
 568                         /* enable "Frame End Interrupt Enable" bit */
 569                         lcdc_write(priv, _LDINTR, LDINTR_FE);
 570
 571                 } else {
 572                         /* continuous read mode */
 573                         lcdc_write_chan(ch, LDSM1R, 0);
 574                 }
 575         }
 576
 577         /* display output */
 578         lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
 579
 580         /* start the lcdc */
 581         sh_mobile_lcdc_start_stop(priv, 1);
 582         priv->started = 1;
 583
 584         /* tell the board code to enable the panel */
 585         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 586                 ch = &priv->ch[k];
 587                 if (!ch->enabled)
 588                         continue;
 589
 590                 board_cfg = &ch->cfg.board_cfg;
 591                 if (try_module_get(board_cfg->owner) && board_cfg->display_on) {
 592                         board_cfg->display_on(board_cfg->board_data, ch->info);
 593                         module_put(board_cfg->owner);
 594                 }
 595         }
 596
 597         return 0;
 598 }
 599
 600 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
 601 {
 602         struct sh_mobile_lcdc_chan *ch;
 603         struct sh_mobile_lcdc_board_cfg *board_cfg;
 604         int k;
 605
 606         /* clean up deferred io and ask board code to disable panel */
 607         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 608                 ch = &priv->ch[k];
 609                 if (!ch->enabled)
 610                         continue;
 611
 612                 /* deferred io mode:
 613                  * flush frame, and wait for frame end interrupt
 614                  * clean up deferred io and enable clock
 615                  */
 616                 if (ch->info && ch->info->fbdefio) {
 617                         ch->frame_end = 0;
 618                         schedule_delayed_work(&ch->info->deferred_work, 0);
 619                         wait_event(ch->frame_end_wait, ch->frame_end);
 620                         fb_deferred_io_cleanup(ch->info);
 621                         ch->info->fbdefio = NULL;
 622                         sh_mobile_lcdc_clk_on(priv);
 623                 }
 624
 625                 board_cfg = &ch->cfg.board_cfg;
 626                 if (try_module_get(board_cfg->owner) && board_cfg->display_off) {
 627                         board_cfg->display_off(board_cfg->board_data);
 628                         module_put(board_cfg->owner);
 629                 }
 630         }
 631
 632         /* stop the lcdc */
 633         if (priv->started) {
 634                 sh_mobile_lcdc_start_stop(priv, 0);
 635                 priv->started = 0;
 636         }
 637
 638         /* stop clocks */
 639         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 640                 if (priv->ch[k].enabled)
 641                         sh_mobile_lcdc_clk_off(priv);
 642 }
 643
 644 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
 645 {
 646         int ifm, miftyp;
 647
 648         switch (ch->cfg.interface_type) {
 649         case RGB8: ifm = 0; miftyp = 0; break;
 650         case RGB9: ifm = 0; miftyp = 4; break;
 651         case RGB12A: ifm = 0; miftyp = 5; break;
 652         case RGB12B: ifm = 0; miftyp = 6; break;
 653         case RGB16: ifm = 0; miftyp = 7; break;
 654         case RGB18: ifm = 0; miftyp = 10; break;
 655         case RGB24: ifm = 0; miftyp = 11; break;
 656         case SYS8A: ifm = 1; miftyp = 0; break;
 657         case SYS8B: ifm = 1; miftyp = 1; break;
 658         case SYS8C: ifm = 1; miftyp = 2; break;
 659         case SYS8D: ifm = 1; miftyp = 3; break;
 660         case SYS9: ifm = 1; miftyp = 4; break;
 661         case SYS12: ifm = 1; miftyp = 5; break;
 662         case SYS16A: ifm = 1; miftyp = 7; break;
 663         case SYS16B: ifm = 1; miftyp = 8; break;
 664         case SYS16C: ifm = 1; miftyp = 9; break;
 665         case SYS18: ifm = 1; miftyp = 10; break;
 666         case SYS24: ifm = 1; miftyp = 11; break;
 667         default: goto bad;
 668         }
 669
 670         /* SUBLCD only supports SYS interface */
 671         if (lcdc_chan_is_sublcd(ch)) {
 672                 if (ifm == 0)
 673                         goto bad;
 674                 else
 675                         ifm = 0;
 676         }
 677
 678         ch->ldmt1r_value = (ifm << 12) | miftyp;
 679         return 0;
 680  bad:
 681         return -EINVAL;
 682 }
 683
 684 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
 685                                        int clock_source,
 686                                        struct sh_mobile_lcdc_priv *priv)
 687 {
 688         char *str;
 689         int icksel;
 690
 691         switch (clock_source) {
 692         case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
 693         case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
 694         case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
 695         default:
 696                 return -EINVAL;
 697         }
 698
 699         priv->lddckr = icksel << 16;
 700
 701         if (str) {
 702                 priv->dot_clk = clk_get(&pdev->dev, str);
 703                 if (IS_ERR(priv->dot_clk)) {
 704                         dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
 705                         return PTR_ERR(priv->dot_clk);
 706                 }
 707         }
 708
 709         /* Runtime PM support involves two step for this driver:
 710          * 1) Enable Runtime PM
 711          * 2) Force Runtime PM Resume since hardware is accessed from probe()
 712          */
 713         priv->dev = &pdev->dev;
 714         pm_runtime_enable(priv->dev);
 715         pm_runtime_resume(priv->dev);
 716         return 0;
 717 }
 718
 719 static int sh_mobile_lcdc_setcolreg(u_int regno,
 720                                     u_int red, u_int green, u_int blue,
 721                                     u_int transp, struct fb_info *info)
 722 {
 723         u32 *palette = info->pseudo_palette;
 724
 725         if (regno >= PALETTE_NR)
 726                 return -EINVAL;
 727
 728         /* only FB_VISUAL_TRUECOLOR supported */
 729
 730         red >>= 16 - info->var.red.length;
 731         green >>= 16 - info->var.green.length;
 732         blue >>= 16 - info->var.blue.length;
 733         transp >>= 16 - info->var.transp.length;
 734
 735         palette[regno] = (red << info->var.red.offset) |
 736           (green << info->var.green.offset) |
 737           (blue << info->var.blue.offset) |
 738           (transp << info->var.transp.offset);
 739
 740         return 0;
 741 }
 742
 743 static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
 744         .id =           "SH Mobile LCDC",
 745         .type =         FB_TYPE_PACKED_PIXELS,
 746         .visual =       FB_VISUAL_TRUECOLOR,
 747         .accel =        FB_ACCEL_NONE,
 748         .xpanstep =     0,
 749         .ypanstep =     1,
 750         .ywrapstep =    0,
 751 };
 752
 753 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
 754                                     const struct fb_fillrect *rect)
 755 {
 756         sys_fillrect(info, rect);
 757         sh_mobile_lcdc_deferred_io_touch(info);
 758 }
 759
 760 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
 761                                     const struct fb_copyarea *area)
 762 {
 763         sys_copyarea(info, area);
 764         sh_mobile_lcdc_deferred_io_touch(info);
 765 }
 766
 767 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
 768                                      const struct fb_image *image)
 769 {
 770         sys_imageblit(info, image);
 771         sh_mobile_lcdc_deferred_io_touch(info);
 772 }
 773
 774 static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
 775                                      struct fb_info *info)
 776 {
 777         struct sh_mobile_lcdc_chan *ch = info->par;
 778         struct sh_mobile_lcdc_priv *priv = ch->lcdc;
 779         unsigned long ldrcntr;
 780         unsigned long new_pan_offset;
 781
 782         new_pan_offset = (var->yoffset * info->fix.line_length) +
 783                 (var->xoffset * (info->var.bits_per_pixel / 8));
 784
 785         if (new_pan_offset == ch->pan_offset)
 786                 return 0;       /* No change, do nothing */
 787
 788         ldrcntr = lcdc_read(priv, _LDRCNTR);
 789
 790         /* Set the source address for the next refresh */
 791         lcdc_write_chan_mirror(ch, LDSA1R, ch->dma_handle + new_pan_offset);
 792         if (lcdc_chan_is_sublcd(ch))
 793                 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
 794         else
 795                 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_MRS);
 796
 797         ch->pan_offset = new_pan_offset;
 798
 799         sh_mobile_lcdc_deferred_io_touch(info);
 800
 801         return 0;
 802 }
 803
 804 static int sh_mobile_wait_for_vsync(struct fb_info *info)
 805 {
 806         struct sh_mobile_lcdc_chan *ch = info->par;
 807         unsigned long ldintr;
 808         int ret;
 809
 810         /* Enable VSync End interrupt */
 811         ldintr = lcdc_read(ch->lcdc, _LDINTR);
 812         ldintr |= LDINTR_VEE;
 813         lcdc_write(ch->lcdc, _LDINTR, ldintr);
 814
 815         ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
 816                                                         msecs_to_jiffies(100));
 817         if (!ret)
 818                 return -ETIMEDOUT;
 819
 820         return 0;
 821 }
 822
 823 static int sh_mobile_ioctl(struct fb_info *info, unsigned int cmd,
 824                        unsigned long arg)
 825 {
 826         int retval;
 827
 828         switch (cmd) {
 829         case FBIO_WAITFORVSYNC:
 830                 retval = sh_mobile_wait_for_vsync(info);
 831                 break;
 832
 833         default:
 834                 retval = -ENOIOCTLCMD;
 835                 break;
 836         }
 837         return retval;
 838 }
 839
 840 static void sh_mobile_fb_reconfig(struct fb_info *info)
 841 {
 842         struct sh_mobile_lcdc_chan *ch = info->par;
 843         struct fb_videomode mode1, mode2;
 844         struct fb_event event;
 845         int evnt = FB_EVENT_MODE_CHANGE_ALL;
 846
 847         if (ch->use_count > 1 || (ch->use_count == 1 && !info->fbcon_par))
 848                 /* More framebuffer users are active */
 849                 return;
 850
 851         fb_var_to_videomode(&mode1, &ch->display_var);
 852         fb_var_to_videomode(&mode2, &info->var);
 853
 854         if (fb_mode_is_equal(&mode1, &mode2))
 855                 return;
 856
 857         /* Display has been re-plugged, framebuffer is free now, reconfigure */
 858         if (fb_set_var(info, &ch->display_var) < 0)
 859                 /* Couldn't reconfigure, hopefully, can continue as before */
 860                 return;
 861
 862         info->fix.line_length = mode2.xres * (ch->cfg.bpp / 8);
 863
 864         /*
 865          * fb_set_var() calls the notifier change internally, only if
 866          * FBINFO_MISC_USEREVENT flag is set. Since we do not want to fake a
 867          * user event, we have to call the chain ourselves.
 868          */
 869         event.info = info;
 870         event.data = &mode2;
 871         fb_notifier_call_chain(evnt, &event);
 872 }
 873
 874 /*
 875  * Locking: both .fb_release() and .fb_open() are called with info->lock held if
 876  * user == 1, or with console sem held, if user == 0.
 877  */
 878 static int sh_mobile_release(struct fb_info *info, int user)
 879 {
 880         struct sh_mobile_lcdc_chan *ch = info->par;
 881
 882         mutex_lock(&ch->open_lock);
 883         dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
 884
 885         ch->use_count--;
 886
 887         /* Nothing to reconfigure, when called from fbcon */
 888         if (user) {
 889                 acquire_console_sem();
 890                 sh_mobile_fb_reconfig(info);
 891                 release_console_sem();
 892         }
 893
 894         mutex_unlock(&ch->open_lock);
 895
 896         return 0;
 897 }
 898
 899 static int sh_mobile_open(struct fb_info *info, int user)
 900 {
 901         struct sh_mobile_lcdc_chan *ch = info->par;
 902
 903         mutex_lock(&ch->open_lock);
 904         ch->use_count++;
 905
 906         dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
 907         mutex_unlock(&ch->open_lock);
 908
 909         return 0;
 910 }
 911
 912 static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
 913 {
 914         struct sh_mobile_lcdc_chan *ch = info->par;
 915
 916         if (var->xres < 160 || var->xres > 1920 ||
 917             var->yres < 120 || var->yres > 1080 ||
 918             var->left_margin < 32 || var->left_margin > 320 ||
 919             var->right_margin < 12 || var->right_margin > 240 ||
 920             var->upper_margin < 12 || var->upper_margin > 120 ||
 921             var->lower_margin < 1 || var->lower_margin > 64 ||
 922             var->hsync_len < 32 || var->hsync_len > 240 ||
 923             var->vsync_len < 2 || var->vsync_len > 64 ||
 924             var->pixclock < 6000 || var->pixclock > 40000 ||
 925             var->xres * var->yres * (ch->cfg.bpp / 8) * 2 > info->fix.smem_len) {
 926                 dev_warn(info->dev, "Invalid info: %u %u %u %u %u %u %u %u %u!\n",
 927                          var->xres, var->yres,
 928                          var->left_margin, var->right_margin,
 929                          var->upper_margin, var->lower_margin,
 930                          var->hsync_len, var->vsync_len,
 931                          var->pixclock);
 932                 return -EINVAL;
 933         }
 934         return 0;
 935 }
 936
 937 static struct fb_ops sh_mobile_lcdc_ops = {
 938         .owner          = THIS_MODULE,
 939         .fb_setcolreg   = sh_mobile_lcdc_setcolreg,
 940         .fb_read        = fb_sys_read,
 941         .fb_write       = fb_sys_write,
 942         .fb_fillrect    = sh_mobile_lcdc_fillrect,
 943         .fb_copyarea    = sh_mobile_lcdc_copyarea,
 944         .fb_imageblit   = sh_mobile_lcdc_imageblit,
 945         .fb_pan_display = sh_mobile_fb_pan_display,
 946         .fb_ioctl       = sh_mobile_ioctl,
 947         .fb_open        = sh_mobile_open,
 948         .fb_release     = sh_mobile_release,
 949         .fb_check_var   = sh_mobile_check_var,
 950 };
 951
 952 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
 953 {
 954         switch (bpp) {
 955         case 16: /* PKF[4:0] = 00011 - RGB 565 */
 956                 var->red.offset = 11;
 957                 var->red.length = 5;
 958                 var->green.offset = 5;
 959                 var->green.length = 6;
 960                 var->blue.offset = 0;
 961                 var->blue.length = 5;
 962                 var->transp.offset = 0;
 963                 var->transp.length = 0;
 964                 break;
 965
 966         case 32: /* PKF[4:0] = 00000 - RGB 888
 967                   * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
 968                   * this may be because LDDDSR has word swap enabled..
 969                   */
 970                 var->red.offset = 0;
 971                 var->red.length = 8;
 972                 var->green.offset = 24;
 973                 var->green.length = 8;
 974                 var->blue.offset = 16;
 975                 var->blue.length = 8;
 976                 var->transp.offset = 0;
 977                 var->transp.length = 0;
 978                 break;
 979         default:
 980                 return -EINVAL;
 981         }
 982         var->bits_per_pixel = bpp;
 983         var->red.msb_right = 0;
 984         var->green.msb_right = 0;
 985         var->blue.msb_right = 0;
 986         var->transp.msb_right = 0;
 987         return 0;
 988 }
 989
 990 static int sh_mobile_lcdc_suspend(struct device *dev)
 991 {
 992         struct platform_device *pdev = to_platform_device(dev);
 993
 994         sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
 995         return 0;
 996 }
 997
 998 static int sh_mobile_lcdc_resume(struct device *dev)
 999 {
1000         struct platform_device *pdev = to_platform_device(dev);
1001
1002         return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
1003 }
1004
1005 static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
1006 {
1007         struct platform_device *pdev = to_platform_device(dev);
1008         struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
1009         struct sh_mobile_lcdc_chan *ch;
1010         int k, n;
1011
1012         /* save per-channel registers */
1013         for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
1014                 ch = &p->ch[k];
1015                 if (!ch->enabled)
1016                         continue;
1017                 for (n = 0; n < NR_CH_REGS; n++)
1018                         ch->saved_ch_regs[n] = lcdc_read_chan(ch, n);
1019         }
1020
1021         /* save shared registers */
1022         for (n = 0; n < NR_SHARED_REGS; n++)
1023                 p->saved_shared_regs[n] = lcdc_read(p, lcdc_shared_regs[n]);
1024
1025         /* turn off LCDC hardware */
1026         lcdc_write(p, _LDCNT1R, 0);
1027         return 0;
1028 }
1029
1030 static int sh_mobile_lcdc_runtime_resume(struct device *dev)
1031 {
1032         struct platform_device *pdev = to_platform_device(dev);
1033         struct sh_mobile_lcdc_priv *p = platform_get_drvdata(pdev);
1034         struct sh_mobile_lcdc_chan *ch;
1035         int k, n;
1036
1037         /* restore per-channel registers */
1038         for (k = 0; k < ARRAY_SIZE(p->ch); k++) {
1039                 ch = &p->ch[k];
1040                 if (!ch->enabled)
1041                         continue;
1042                 for (n = 0; n < NR_CH_REGS; n++)
1043                         lcdc_write_chan(ch, n, ch->saved_ch_regs[n]);
1044         }
1045
1046         /* restore shared registers */
1047         for (n = 0; n < NR_SHARED_REGS; n++)
1048                 lcdc_write(p, lcdc_shared_regs[n], p->saved_shared_regs[n]);
1049
1050         return 0;
1051 }
1052
1053 static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
1054         .suspend = sh_mobile_lcdc_suspend,
1055         .resume = sh_mobile_lcdc_resume,
1056         .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
1057         .runtime_resume = sh_mobile_lcdc_runtime_resume,
1058 };
1059
1060 /* locking: called with info->lock held */
1061 static int sh_mobile_lcdc_notify(struct notifier_block *nb,
1062                                  unsigned long action, void *data)
1063 {
1064         struct fb_event *event = data;
1065         struct fb_info *info = event->info;
1066         struct sh_mobile_lcdc_chan *ch = info->par;
1067         struct sh_mobile_lcdc_board_cfg *board_cfg = &ch->cfg.board_cfg;
1068         int ret;
1069
1070         if (&ch->lcdc->notifier != nb)
1071                 return NOTIFY_DONE;
1072
1073         dev_dbg(info->dev, "%s(): action = %lu, data = %p\n",
1074                 __func__, action, event->data);
1075
1076         switch(action) {
1077         case FB_EVENT_SUSPEND:
1078                 if (try_module_get(board_cfg->owner) && board_cfg->display_off) {
1079                         board_cfg->display_off(board_cfg->board_data);
1080                         module_put(board_cfg->owner);
1081                 }
1082                 pm_runtime_put(info->device);
1083                 sh_mobile_lcdc_stop(ch->lcdc);
1084                 break;
1085         case FB_EVENT_RESUME:
1086                 mutex_lock(&ch->open_lock);
1087                 sh_mobile_fb_reconfig(info);
1088                 mutex_unlock(&ch->open_lock);
1089
1090                 /* HDMI must be enabled before LCDC configuration */
1091                 if (try_module_get(board_cfg->owner) && board_cfg->display_on) {
1092                         board_cfg->display_on(board_cfg->board_data, info);
1093                         module_put(board_cfg->owner);
1094                 }
1095
1096                 ret = sh_mobile_lcdc_start(ch->lcdc);
1097                 if (!ret)
1098                         pm_runtime_get_sync(info->device);
1099         }
1100
1101         return NOTIFY_OK;
1102 }
1103
1104 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
1105
1106 static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
1107 {
1108         struct fb_info *info;
1109         struct sh_mobile_lcdc_priv *priv;
1110         struct sh_mobile_lcdc_info *pdata = pdev->dev.platform_data;
1111         struct resource *res;
1112         int error;
1113         void *buf;
1114         int i, j;
1115
1116         if (!pdata) {
1117                 dev_err(&pdev->dev, "no platform data defined\n");
1118                 return -EINVAL;
1119         }
1120
1121         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1122         i = platform_get_irq(pdev, 0);
1123         if (!res || i < 0) {
1124                 dev_err(&pdev->dev, "cannot get platform resources\n");
1125                 return -ENOENT;
1126         }
1127
1128         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1129         if (!priv) {
1130                 dev_err(&pdev->dev, "cannot allocate device data\n");
1131                 return -ENOMEM;
1132         }
1133
1134         platform_set_drvdata(pdev, priv);
1135
1136         error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
1137                             dev_name(&pdev->dev), priv);
1138         if (error) {
1139                 dev_err(&pdev->dev, "unable to request irq\n");
1140                 goto err1;
1141         }
1142
1143         priv->irq = i;
1144         atomic_set(&priv->hw_usecnt, -1);
1145
1146         j = 0;
1147         for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
1148                 struct sh_mobile_lcdc_chan *ch = priv->ch + j;
1149
1150                 ch->lcdc = priv;
1151                 memcpy(&ch->cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
1152
1153                 error = sh_mobile_lcdc_check_interface(ch);
1154                 if (error) {
1155                         dev_err(&pdev->dev, "unsupported interface type\n");
1156                         goto err1;
1157                 }
1158                 init_waitqueue_head(&ch->frame_end_wait);
1159                 init_completion(&ch->vsync_completion);
1160                 ch->pan_offset = 0;
1161
1162                 switch (pdata->ch[i].chan) {
1163                 case LCDC_CHAN_MAINLCD:
1164                         ch->enabled = 1 << 1;
1165                         ch->reg_offs = lcdc_offs_mainlcd;
1166                         j++;
1167                         break;
1168                 case LCDC_CHAN_SUBLCD:
1169                         ch->enabled = 1 << 2;
1170                         ch->reg_offs = lcdc_offs_sublcd;
1171                         j++;
1172                         break;
1173                 }
1174         }
1175
1176         if (!j) {
1177                 dev_err(&pdev->dev, "no channels defined\n");
1178                 error = -EINVAL;
1179                 goto err1;
1180         }
1181
1182         priv->base = ioremap_nocache(res->start, resource_size(res));
1183         if (!priv->base)
1184                 goto err1;
1185
1186         error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
1187         if (error) {
1188                 dev_err(&pdev->dev, "unable to setup clocks\n");
1189                 goto err1;
1190         }
1191
1192         for (i = 0; i < j; i++) {
1193                 struct fb_var_screeninfo *var;
1194                 const struct fb_videomode *lcd_cfg, *max_cfg = NULL;
1195                 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1196                 struct sh_mobile_lcdc_chan_cfg *cfg = &ch->cfg;
1197                 const struct fb_videomode *mode = cfg->lcd_cfg;
1198                 unsigned long max_size = 0;
1199                 int k;
1200
1201                 ch->info = framebuffer_alloc(0, &pdev->dev);
1202                 if (!ch->info) {
1203                         dev_err(&pdev->dev, "unable to allocate fb_info\n");
1204                         error = -ENOMEM;
1205                         break;
1206                 }
1207
1208                 info = ch->info;
1209                 var = &info->var;
1210                 info->fbops = &sh_mobile_lcdc_ops;
1211                 info->par = ch;
1212
1213                 mutex_init(&ch->open_lock);
1214
1215                 for (k = 0, lcd_cfg = mode;
1216                      k < cfg->num_cfg && lcd_cfg;
1217                      k++, lcd_cfg++) {
1218                         unsigned long size = lcd_cfg->yres * lcd_cfg->xres;
1219
1220                         if (size > max_size) {
1221                                 max_cfg = lcd_cfg;
1222                                 max_size = size;
1223                         }
1224                 }
1225
1226                 if (!mode)
1227                         max_size = DEFAULT_XRES * DEFAULT_YRES;
1228                 else if (max_cfg)
1229                         dev_dbg(&pdev->dev, "Found largest videomode %ux%u\n",
1230                                 max_cfg->xres, max_cfg->yres);
1231
1232                 info->fix = sh_mobile_lcdc_fix;
1233                 info->fix.smem_len = max_size * (cfg->bpp / 8) * 2;
1234
1235                 if (!mode)
1236                         mode = &default_720p;
1237
1238                 fb_videomode_to_var(var, mode);
1239                 /* Default Y virtual resolution is 2x panel size */
1240                 var->yres_virtual = var->yres * 2;
1241                 var->activate = FB_ACTIVATE_NOW;
1242
1243                 error = sh_mobile_lcdc_set_bpp(var, cfg->bpp);
1244                 if (error)
1245                         break;
1246
1247                 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
1248                                          &ch->dma_handle, GFP_KERNEL);
1249                 if (!buf) {
1250                         dev_err(&pdev->dev, "unable to allocate buffer\n");
1251                         error = -ENOMEM;
1252                         break;
1253                 }
1254
1255                 info->pseudo_palette = &ch->pseudo_palette;
1256                 info->flags = FBINFO_FLAG_DEFAULT;
1257
1258                 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
1259                 if (error < 0) {
1260                         dev_err(&pdev->dev, "unable to allocate cmap\n");
1261                         dma_free_coherent(&pdev->dev, info->fix.smem_len,
1262                                           buf, ch->dma_handle);
1263                         break;
1264                 }
1265
1266                 info->fix.smem_start = ch->dma_handle;
1267                 info->fix.line_length = var->xres * (cfg->bpp / 8);
1268                 info->screen_base = buf;
1269                 info->device = &pdev->dev;
1270                 ch->display_var = *var;
1271         }
1272
1273         if (error)
1274                 goto err1;
1275
1276         error = sh_mobile_lcdc_start(priv);
1277         if (error) {
1278                 dev_err(&pdev->dev, "unable to start hardware\n");
1279                 goto err1;
1280         }
1281
1282         for (i = 0; i < j; i++) {
1283                 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1284                 const struct fb_videomode *mode = ch->cfg.lcd_cfg;
1285
1286                 if (!mode)
1287                         mode = &default_720p;
1288
1289                 info = ch->info;
1290
1291                 if (info->fbdefio) {
1292                         ch->sglist = vmalloc(sizeof(struct scatterlist) *
1293                                         info->fix.smem_len >> PAGE_SHIFT);
1294                         if (!ch->sglist) {
1295                                 dev_err(&pdev->dev, "cannot allocate sglist\n");
1296                                 goto err1;
1297                         }
1298                 }
1299
1300                 fb_videomode_to_modelist(mode, ch->cfg.num_cfg, &info->modelist);
1301                 error = register_framebuffer(info);
1302                 if (error < 0)
1303                         goto err1;
1304
1305                 dev_info(info->dev,
1306                          "registered %s/%s as %dx%d %dbpp.\n",
1307                          pdev->name,
1308                          (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
1309                          "mainlcd" : "sublcd",
1310                          info->var.xres, info->var.yres,
1311                          ch->cfg.bpp);
1312
1313                 /* deferred io mode: disable clock to save power */
1314                 if (info->fbdefio || info->state == FBINFO_STATE_SUSPENDED)
1315                         sh_mobile_lcdc_clk_off(priv);
1316         }
1317
1318         /* Failure ignored */
1319         priv->notifier.notifier_call = sh_mobile_lcdc_notify;
1320         fb_register_client(&priv->notifier);
1321
1322         return 0;
1323 err1:
1324         sh_mobile_lcdc_remove(pdev);
1325
1326         return error;
1327 }
1328
1329 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
1330 {
1331         struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1332         struct fb_info *info;
1333         int i;
1334
1335         fb_unregister_client(&priv->notifier);
1336
1337         for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
1338                 if (priv->ch[i].info && priv->ch[i].info->dev)
1339                         unregister_framebuffer(priv->ch[i].info);
1340
1341         sh_mobile_lcdc_stop(priv);
1342
1343         for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1344                 info = priv->ch[i].info;
1345
1346                 if (!info || !info->device)
1347                         continue;
1348
1349                 if (priv->ch[i].sglist)
1350                         vfree(priv->ch[i].sglist);
1351
1352                 if (info->screen_base)
1353                         dma_free_coherent(&pdev->dev, info->fix.smem_len,
1354                                           info->screen_base,
1355                                           priv->ch[i].dma_handle);
1356                 fb_dealloc_cmap(&info->cmap);
1357                 framebuffer_release(info);
1358         }
1359
1360         if (priv->dot_clk)
1361                 clk_put(priv->dot_clk);
1362
1363         if (priv->dev)
1364                 pm_runtime_disable(priv->dev);
1365
1366         if (priv->base)
1367                 iounmap(priv->base);
1368
1369         if (priv->irq)
1370                 free_irq(priv->irq, priv);
1371         kfree(priv);
1372         return 0;
1373 }
1374
1375 static struct platform_driver sh_mobile_lcdc_driver = {
1376         .driver         = {
1377                 .name           = "sh_mobile_lcdc_fb",
1378                 .owner          = THIS_MODULE,
1379                 .pm             = &sh_mobile_lcdc_dev_pm_ops,
1380         },
1381         .probe          = sh_mobile_lcdc_probe,
1382         .remove         = sh_mobile_lcdc_remove,
1383 };
1384
1385 static int __init sh_mobile_lcdc_init(void)
1386 {
1387         return platform_driver_register(&sh_mobile_lcdc_driver);
1388 }
1389
1390 static void __exit sh_mobile_lcdc_exit(void)
1391 {
1392         platform_driver_unregister(&sh_mobile_lcdc_driver);
1393 }
1394
1395 module_init(sh_mobile_lcdc_init);
1396 module_exit(sh_mobile_lcdc_exit);
1397
1398 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
1399 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
1400 MODULE_LICENSE("GPL v2");