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 <linux/backlight.h>
  25 #include <linux/gpio.h>
  26 #include <linux/module.h>
  27 #include <video/sh_mobile_lcdc.h>
  28 #include <video/sh_mobile_meram.h>
  29 #include <linux/atomic.h>
  30
  31 #include "sh_mobile_lcdcfb.h"
  32
  33 #define SIDE_B_OFFSET 0x1000
  34 #define MIRROR_OFFSET 0x2000
  35
  36 #define MAX_XRES 1920
  37 #define MAX_YRES 1080
  38
  39 static unsigned long lcdc_offs_mainlcd[NR_CH_REGS] = {
  40         [LDDCKPAT1R] = 0x400,
  41         [LDDCKPAT2R] = 0x404,
  42         [LDMT1R] = 0x418,
  43         [LDMT2R] = 0x41c,
  44         [LDMT3R] = 0x420,
  45         [LDDFR] = 0x424,
  46         [LDSM1R] = 0x428,
  47         [LDSM2R] = 0x42c,
  48         [LDSA1R] = 0x430,
  49         [LDSA2R] = 0x434,
  50         [LDMLSR] = 0x438,
  51         [LDHCNR] = 0x448,
  52         [LDHSYNR] = 0x44c,
  53         [LDVLNR] = 0x450,
  54         [LDVSYNR] = 0x454,
  55         [LDPMR] = 0x460,
  56         [LDHAJR] = 0x4a0,
  57 };
  58
  59 static unsigned long lcdc_offs_sublcd[NR_CH_REGS] = {
  60         [LDDCKPAT1R] = 0x408,
  61         [LDDCKPAT2R] = 0x40c,
  62         [LDMT1R] = 0x600,
  63         [LDMT2R] = 0x604,
  64         [LDMT3R] = 0x608,
  65         [LDDFR] = 0x60c,
  66         [LDSM1R] = 0x610,
  67         [LDSM2R] = 0x614,
  68         [LDSA1R] = 0x618,
  69         [LDMLSR] = 0x620,
  70         [LDHCNR] = 0x624,
  71         [LDHSYNR] = 0x628,
  72         [LDVLNR] = 0x62c,
  73         [LDVSYNR] = 0x630,
  74         [LDPMR] = 0x63c,
  75 };
  76
  77 static const struct fb_videomode default_720p = {
  78         .name = "HDMI 720p",
  79         .xres = 1280,
  80         .yres = 720,
  81
  82         .left_margin = 220,
  83         .right_margin = 110,
  84         .hsync_len = 40,
  85
  86         .upper_margin = 20,
  87         .lower_margin = 5,
  88         .vsync_len = 5,
  89
  90         .pixclock = 13468,
  91         .refresh = 60,
  92         .sync = FB_SYNC_VERT_HIGH_ACT | FB_SYNC_HOR_HIGH_ACT,
  93 };
  94
  95 struct sh_mobile_lcdc_priv {
  96         void __iomem *base;
  97         int irq;
  98         atomic_t hw_usecnt;
  99         struct device *dev;
 100         struct clk *dot_clk;
 101         unsigned long lddckr;
 102         struct sh_mobile_lcdc_chan ch[2];
 103         struct notifier_block notifier;
 104         int started;
 105         int forced_bpp; /* 2 channel LCDC must share bpp setting */
 106         struct sh_mobile_meram_info *meram_dev;
 107 };
 108
 109 static bool banked(int reg_nr)
 110 {
 111         switch (reg_nr) {
 112         case LDMT1R:
 113         case LDMT2R:
 114         case LDMT3R:
 115         case LDDFR:
 116         case LDSM1R:
 117         case LDSA1R:
 118         case LDSA2R:
 119         case LDMLSR:
 120         case LDHCNR:
 121         case LDHSYNR:
 122         case LDVLNR:
 123         case LDVSYNR:
 124                 return true;
 125         }
 126         return false;
 127 }
 128
 129 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
 130                             int reg_nr, unsigned long data)
 131 {
 132         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
 133         if (banked(reg_nr))
 134                 iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
 135                           SIDE_B_OFFSET);
 136 }
 137
 138 static void lcdc_write_chan_mirror(struct sh_mobile_lcdc_chan *chan,
 139                             int reg_nr, unsigned long data)
 140 {
 141         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr] +
 142                   MIRROR_OFFSET);
 143 }
 144
 145 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
 146                                     int reg_nr)
 147 {
 148         return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
 149 }
 150
 151 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
 152                        unsigned long reg_offs, unsigned long data)
 153 {
 154         iowrite32(data, priv->base + reg_offs);
 155 }
 156
 157 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
 158                                unsigned long reg_offs)
 159 {
 160         return ioread32(priv->base + reg_offs);
 161 }
 162
 163 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
 164                           unsigned long reg_offs,
 165                           unsigned long mask, unsigned long until)
 166 {
 167         while ((lcdc_read(priv, reg_offs) & mask) != until)
 168                 cpu_relax();
 169 }
 170
 171 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
 172 {
 173         return chan->cfg.chan == LCDC_CHAN_SUBLCD;
 174 }
 175
 176 static void lcdc_sys_write_index(void *handle, unsigned long data)
 177 {
 178         struct sh_mobile_lcdc_chan *ch = handle;
 179
 180         lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT);
 181         lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
 182         lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
 183                    (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 184         lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
 185 }
 186
 187 static void lcdc_sys_write_data(void *handle, unsigned long data)
 188 {
 189         struct sh_mobile_lcdc_chan *ch = handle;
 190
 191         lcdc_write(ch->lcdc, _LDDWD0R, data | LDDWDxR_WDACT | LDDWDxR_RSW);
 192         lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
 193         lcdc_write(ch->lcdc, _LDDWAR, LDDWAR_WA |
 194                    (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 195         lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
 196 }
 197
 198 static unsigned long lcdc_sys_read_data(void *handle)
 199 {
 200         struct sh_mobile_lcdc_chan *ch = handle;
 201
 202         lcdc_write(ch->lcdc, _LDDRDR, LDDRDR_RSR);
 203         lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
 204         lcdc_write(ch->lcdc, _LDDRAR, LDDRAR_RA |
 205                    (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 206         udelay(1);
 207         lcdc_wait_bit(ch->lcdc, _LDSR, LDSR_AS, 0);
 208
 209         return lcdc_read(ch->lcdc, _LDDRDR) & LDDRDR_DRD_MASK;
 210 }
 211
 212 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
 213         lcdc_sys_write_index,
 214         lcdc_sys_write_data,
 215         lcdc_sys_read_data,
 216 };
 217
 218 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
 219 {
 220         if (atomic_inc_and_test(&priv->hw_usecnt)) {
 221                 if (priv->dot_clk)
 222                         clk_enable(priv->dot_clk);
 223                 pm_runtime_get_sync(priv->dev);
 224                 if (priv->meram_dev && priv->meram_dev->pdev)
 225                         pm_runtime_get_sync(&priv->meram_dev->pdev->dev);
 226         }
 227 }
 228
 229 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
 230 {
 231         if (atomic_sub_return(1, &priv->hw_usecnt) == -1) {
 232                 if (priv->meram_dev && priv->meram_dev->pdev)
 233                         pm_runtime_put_sync(&priv->meram_dev->pdev->dev);
 234                 pm_runtime_put(priv->dev);
 235                 if (priv->dot_clk)
 236                         clk_disable(priv->dot_clk);
 237         }
 238 }
 239
 240 static int sh_mobile_lcdc_sginit(struct fb_info *info,
 241                                   struct list_head *pagelist)
 242 {
 243         struct sh_mobile_lcdc_chan *ch = info->par;
 244         unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
 245         struct page *page;
 246         int nr_pages = 0;
 247
 248         sg_init_table(ch->sglist, nr_pages_max);
 249
 250         list_for_each_entry(page, pagelist, lru)
 251                 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
 252
 253         return nr_pages;
 254 }
 255
 256 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
 257                                        struct list_head *pagelist)
 258 {
 259         struct sh_mobile_lcdc_chan *ch = info->par;
 260         struct sh_mobile_lcdc_board_cfg *bcfg = &ch->cfg.board_cfg;
 261
 262         /* enable clocks before accessing hardware */
 263         sh_mobile_lcdc_clk_on(ch->lcdc);
 264
 265         /*
 266          * It's possible to get here without anything on the pagelist via
 267          * sh_mobile_lcdc_deferred_io_touch() or via a userspace fsync()
 268          * invocation. In the former case, the acceleration routines are
 269          * stepped in to when using the framebuffer console causing the
 270          * workqueue to be scheduled without any dirty pages on the list.
 271          *
 272          * Despite this, a panel update is still needed given that the
 273          * acceleration routines have their own methods for writing in
 274          * that still need to be updated.
 275          *
 276          * The fsync() and empty pagelist case could be optimized for,
 277          * but we don't bother, as any application exhibiting such
 278          * behaviour is fundamentally broken anyways.
 279          */
 280         if (!list_empty(pagelist)) {
 281                 unsigned int nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
 282
 283                 /* trigger panel update */
 284                 dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
 285                 if (bcfg->start_transfer)
 286                         bcfg->start_transfer(bcfg->board_data, ch,
 287                                              &sh_mobile_lcdc_sys_bus_ops);
 288                 lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);
 289                 dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
 290         } else {
 291                 if (bcfg->start_transfer)
 292                         bcfg->start_transfer(bcfg->board_data, ch,
 293                                              &sh_mobile_lcdc_sys_bus_ops);
 294                 lcdc_write_chan(ch, LDSM2R, LDSM2R_OSTRG);
 295         }
 296 }
 297
 298 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
 299 {
 300         struct fb_deferred_io *fbdefio = info->fbdefio;
 301
 302         if (fbdefio)
 303                 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
 304 }
 305
 306 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
 307 {
 308         struct sh_mobile_lcdc_priv *priv = data;
 309         struct sh_mobile_lcdc_chan *ch;
 310         unsigned long ldintr;
 311         int is_sub;
 312         int k;
 313
 314         /* Acknowledge interrupts and disable further VSYNC End IRQs. */
 315         ldintr = lcdc_read(priv, _LDINTR);
 316         lcdc_write(priv, _LDINTR, (ldintr ^ LDINTR_STATUS_MASK) & ~LDINTR_VEE);
 317
 318         /* figure out if this interrupt is for main or sub lcd */
 319         is_sub = (lcdc_read(priv, _LDSR) & LDSR_MSS) ? 1 : 0;
 320
 321         /* wake up channel and disable clocks */
 322         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 323                 ch = &priv->ch[k];
 324
 325                 if (!ch->enabled)
 326                         continue;
 327
 328                 /* Frame End */
 329                 if (ldintr & LDINTR_FS) {
 330                         if (is_sub == lcdc_chan_is_sublcd(ch)) {
 331                                 ch->frame_end = 1;
 332                                 wake_up(&ch->frame_end_wait);
 333
 334                                 sh_mobile_lcdc_clk_off(priv);
 335                         }
 336                 }
 337
 338                 /* VSYNC End */
 339                 if (ldintr & LDINTR_VES)
 340                         complete(&ch->vsync_completion);
 341         }
 342
 343         return IRQ_HANDLED;
 344 }
 345
 346 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
 347                                       int start)
 348 {
 349         unsigned long tmp = lcdc_read(priv, _LDCNT2R);
 350         int k;
 351
 352         /* start or stop the lcdc */
 353         if (start)
 354                 lcdc_write(priv, _LDCNT2R, tmp | LDCNT2R_DO);
 355         else
 356                 lcdc_write(priv, _LDCNT2R, tmp & ~LDCNT2R_DO);
 357
 358         /* wait until power is applied/stopped on all channels */
 359         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 360                 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
 361                         while (1) {
 362                                 tmp = lcdc_read_chan(&priv->ch[k], LDPMR)
 363                                     & LDPMR_LPS;
 364                                 if (start && tmp == LDPMR_LPS)
 365                                         break;
 366                                 if (!start && tmp == 0)
 367                                         break;
 368                                 cpu_relax();
 369                         }
 370
 371         if (!start)
 372                 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
 373 }
 374
 375 static void sh_mobile_lcdc_geometry(struct sh_mobile_lcdc_chan *ch)
 376 {
 377         struct fb_var_screeninfo *var = &ch->info->var, *display_var = &ch->display_var;
 378         unsigned long h_total, hsync_pos, display_h_total;
 379         u32 tmp;
 380
 381         tmp = ch->ldmt1r_value;
 382         tmp |= (var->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : LDMT1R_VPOL;
 383         tmp |= (var->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : LDMT1R_HPOL;
 384         tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? LDMT1R_DWPOL : 0;
 385         tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? LDMT1R_DIPOL : 0;
 386         tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? LDMT1R_DAPOL : 0;
 387         tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? LDMT1R_HSCNT : 0;
 388         tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? LDMT1R_DWCNT : 0;
 389         lcdc_write_chan(ch, LDMT1R, tmp);
 390
 391         /* setup SYS bus */
 392         lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
 393         lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
 394
 395         /* horizontal configuration */
 396         h_total = display_var->xres + display_var->hsync_len +
 397                 display_var->left_margin + display_var->right_margin;
 398         tmp = h_total / 8; /* HTCN */
 399         tmp |= (min(display_var->xres, var->xres) / 8) << 16; /* HDCN */
 400         lcdc_write_chan(ch, LDHCNR, tmp);
 401
 402         hsync_pos = display_var->xres + display_var->right_margin;
 403         tmp = hsync_pos / 8; /* HSYNP */
 404         tmp |= (display_var->hsync_len / 8) << 16; /* HSYNW */
 405         lcdc_write_chan(ch, LDHSYNR, tmp);
 406
 407         /* vertical configuration */
 408         tmp = display_var->yres + display_var->vsync_len +
 409                 display_var->upper_margin + display_var->lower_margin; /* VTLN */
 410         tmp |= min(display_var->yres, var->yres) << 16; /* VDLN */
 411         lcdc_write_chan(ch, LDVLNR, tmp);
 412
 413         tmp = display_var->yres + display_var->lower_margin; /* VSYNP */
 414         tmp |= display_var->vsync_len << 16; /* VSYNW */
 415         lcdc_write_chan(ch, LDVSYNR, tmp);
 416
 417         /* Adjust horizontal synchronisation for HDMI */
 418         display_h_total = display_var->xres + display_var->hsync_len +
 419                 display_var->left_margin + display_var->right_margin;
 420         tmp = ((display_var->xres & 7) << 24) |
 421                 ((display_h_total & 7) << 16) |
 422                 ((display_var->hsync_len & 7) << 8) |
 423                 hsync_pos;
 424         lcdc_write_chan(ch, LDHAJR, tmp);
 425 }
 426
 427 /*
 428  * __sh_mobile_lcdc_start - Configure and tart the LCDC
 429  * @priv: LCDC device
 430  *
 431  * Configure all enabled channels and start the LCDC device. All external
 432  * devices (clocks, MERAM, panels, ...) are not touched by this function.
 433  */
 434 static void __sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
 435 {
 436         struct sh_mobile_lcdc_chan *ch;
 437         unsigned long tmp;
 438         int bpp = 0;
 439         int k, m;
 440
 441         /* Enable LCDC channels. Read data from external memory, avoid using the
 442          * BEU for now.
 443          */
 444         lcdc_write(priv, _LDCNT2R, priv->ch[0].enabled | priv->ch[1].enabled);
 445
 446         /* Stop the LCDC first and disable all interrupts. */
 447         sh_mobile_lcdc_start_stop(priv, 0);
 448         lcdc_write(priv, _LDINTR, 0);
 449
 450         /* Configure power supply, dot clocks and start them. */
 451         tmp = priv->lddckr;
 452         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 453                 ch = &priv->ch[k];
 454                 if (!ch->enabled)
 455                         continue;
 456
 457                 if (!bpp)
 458                         bpp = ch->info->var.bits_per_pixel;
 459
 460                 /* Power supply */
 461                 lcdc_write_chan(ch, LDPMR, 0);
 462
 463                 m = ch->cfg.clock_divider;
 464                 if (!m)
 465                         continue;
 466
 467                 /* FIXME: sh7724 can only use 42, 48, 54 and 60 for the divider
 468                  * denominator.
 469                  */
 470                 lcdc_write_chan(ch, LDDCKPAT1R, 0);
 471                 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
 472
 473                 if (m == 1)
 474                         m = LDDCKR_MOSEL;
 475                 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
 476         }
 477
 478         lcdc_write(priv, _LDDCKR, tmp);
 479         lcdc_write(priv, _LDDCKSTPR, 0);
 480         lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
 481
 482         /* Setup geometry, format, frame buffer memory and operation mode. */
 483         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 484                 ch = &priv->ch[k];
 485                 if (!ch->enabled)
 486                         continue;
 487
 488                 sh_mobile_lcdc_geometry(ch);
 489
 490                 if (ch->info->var.nonstd) {
 491                         tmp = (ch->info->var.nonstd << 16);
 492                         switch (ch->info->var.bits_per_pixel) {
 493                         case 12:
 494                                 tmp |= LDDFR_YF_420;
 495                                 break;
 496                         case 16:
 497                                 tmp |= LDDFR_YF_422;
 498                                 break;
 499                         case 24:
 500                         default:
 501                                 tmp |= LDDFR_YF_444;
 502                                 break;
 503                         }
 504                 } else {
 505                         switch (ch->info->var.bits_per_pixel) {
 506                         case 16:
 507                                 tmp = LDDFR_PKF_RGB16;
 508                                 break;
 509                         case 24:
 510                                 tmp = LDDFR_PKF_RGB24;
 511                                 break;
 512                         case 32:
 513                         default:
 514                                 tmp = LDDFR_PKF_ARGB32;
 515                                 break;
 516                         }
 517                 }
 518
 519                 lcdc_write_chan(ch, LDDFR, tmp);
 520                 lcdc_write_chan(ch, LDMLSR, ch->pitch);
 521                 lcdc_write_chan(ch, LDSA1R, ch->base_addr_y);
 522                 if (ch->info->var.nonstd)
 523                         lcdc_write_chan(ch, LDSA2R, ch->base_addr_c);
 524
 525                 /* When using deferred I/O mode, configure the LCDC for one-shot
 526                  * operation and enable the frame end interrupt. Otherwise use
 527                  * continuous read mode.
 528                  */
 529                 if (ch->ldmt1r_value & LDMT1R_IFM &&
 530                     ch->cfg.sys_bus_cfg.deferred_io_msec) {
 531                         lcdc_write_chan(ch, LDSM1R, LDSM1R_OS);
 532                         lcdc_write(priv, _LDINTR, LDINTR_FE);
 533                 } else {
 534                         lcdc_write_chan(ch, LDSM1R, 0);
 535                 }
 536         }
 537
 538         /* Word and long word swap. */
 539         if  (priv->ch[0].info->var.nonstd)
 540                 tmp = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;
 541         else {
 542                 switch (bpp) {
 543                 case 16:
 544                         tmp = LDDDSR_LS | LDDDSR_WS;
 545                         break;
 546                 case 24:
 547                         tmp = LDDDSR_LS | LDDDSR_WS | LDDDSR_BS;
 548                         break;
 549                 case 32:
 550                 default:
 551                         tmp = LDDDSR_LS;
 552                         break;
 553                 }
 554         }
 555         lcdc_write(priv, _LDDDSR, tmp);
 556
 557         /* Enable the display output. */
 558         lcdc_write(priv, _LDCNT1R, LDCNT1R_DE);
 559         sh_mobile_lcdc_start_stop(priv, 1);
 560         priv->started = 1;
 561 }
 562
 563 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
 564 {
 565         struct sh_mobile_meram_info *mdev = priv->meram_dev;
 566         struct sh_mobile_lcdc_board_cfg *board_cfg;
 567         struct sh_mobile_lcdc_chan *ch;
 568         unsigned long tmp;
 569         int ret;
 570         int k;
 571
 572         /* enable clocks before accessing the hardware */
 573         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 574                 if (priv->ch[k].enabled)
 575                         sh_mobile_lcdc_clk_on(priv);
 576         }
 577
 578         /* reset */
 579         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LDCNT2R_BR);
 580         lcdc_wait_bit(priv, _LDCNT2R, LDCNT2R_BR, 0);
 581
 582         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 583                 ch = &priv->ch[k];
 584
 585                 if (!ch->enabled)
 586                         continue;
 587
 588                 board_cfg = &ch->cfg.board_cfg;
 589                 if (board_cfg->setup_sys) {
 590                         ret = board_cfg->setup_sys(board_cfg->board_data, ch,
 591                                                    &sh_mobile_lcdc_sys_bus_ops);
 592                         if (ret)
 593                                 return ret;
 594                 }
 595         }
 596
 597         /* Compute frame buffer base address and pitch for each channel. */
 598         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 599                 struct sh_mobile_meram_cfg *cfg;
 600                 int pixelformat;
 601
 602                 ch = &priv->ch[k];
 603                 if (!ch->enabled)
 604                         continue;
 605
 606                 ch->base_addr_y = ch->info->fix.smem_start;
 607                 ch->base_addr_c = ch->base_addr_y
 608                                 + ch->info->var.xres
 609                                 * ch->info->var.yres_virtual;
 610                 ch->pitch = ch->info->fix.line_length;
 611
 612                 /* Enable MERAM if possible. */
 613                 cfg = ch->cfg.meram_cfg;
 614                 if (mdev == NULL || mdev->ops == NULL || cfg == NULL)
 615                         continue;
 616
 617                 /* we need to de-init configured ICBs before we can
 618                  * re-initialize them.
 619                  */
 620                 if (ch->meram_enabled) {
 621                         mdev->ops->meram_unregister(mdev, cfg);
 622                         ch->meram_enabled = 0;
 623                 }
 624
 625                 if (!ch->info->var.nonstd)
 626                         pixelformat = SH_MOBILE_MERAM_PF_RGB;
 627                 else if (ch->info->var.bits_per_pixel == 24)
 628                         pixelformat = SH_MOBILE_MERAM_PF_NV24;
 629                 else
 630                         pixelformat = SH_MOBILE_MERAM_PF_NV;
 631
 632                 ret = mdev->ops->meram_register(mdev, cfg, ch->pitch,
 633                                         ch->info->var.yres, pixelformat,
 634                                         ch->base_addr_y, ch->base_addr_c,
 635                                         &ch->base_addr_y, &ch->base_addr_c,
 636                                         &ch->pitch);
 637                 if (!ret)
 638                         ch->meram_enabled = 1;
 639         }
 640
 641         /* Start the LCDC. */
 642         __sh_mobile_lcdc_start(priv);
 643
 644         /* Setup deferred I/O, tell the board code to enable the panels, and
 645          * turn backlight on.
 646          */
 647         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 648                 ch = &priv->ch[k];
 649                 if (!ch->enabled)
 650                         continue;
 651
 652                 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
 653                 if (ch->ldmt1r_value & LDMT1R_IFM && tmp) {
 654                         ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
 655                         ch->defio.delay = msecs_to_jiffies(tmp);
 656                         ch->info->fbdefio = &ch->defio;
 657                         fb_deferred_io_init(ch->info);
 658                 }
 659
 660                 board_cfg = &ch->cfg.board_cfg;
 661                 if (board_cfg->display_on && try_module_get(board_cfg->owner)) {
 662                         board_cfg->display_on(board_cfg->board_data, ch->info);
 663                         module_put(board_cfg->owner);
 664                 }
 665
 666                 if (ch->bl) {
 667                         ch->bl->props.power = FB_BLANK_UNBLANK;
 668                         backlight_update_status(ch->bl);
 669                 }
 670         }
 671
 672         return 0;
 673 }
 674
 675 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
 676 {
 677         struct sh_mobile_lcdc_chan *ch;
 678         struct sh_mobile_lcdc_board_cfg *board_cfg;
 679         int k;
 680
 681         /* clean up deferred io and ask board code to disable panel */
 682         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 683                 ch = &priv->ch[k];
 684                 if (!ch->enabled)
 685                         continue;
 686
 687                 /* deferred io mode:
 688                  * flush frame, and wait for frame end interrupt
 689                  * clean up deferred io and enable clock
 690                  */
 691                 if (ch->info && ch->info->fbdefio) {
 692                         ch->frame_end = 0;
 693                         schedule_delayed_work(&ch->info->deferred_work, 0);
 694                         wait_event(ch->frame_end_wait, ch->frame_end);
 695                         fb_deferred_io_cleanup(ch->info);
 696                         ch->info->fbdefio = NULL;
 697                         sh_mobile_lcdc_clk_on(priv);
 698                 }
 699
 700                 if (ch->bl) {
 701                         ch->bl->props.power = FB_BLANK_POWERDOWN;
 702                         backlight_update_status(ch->bl);
 703                 }
 704
 705                 board_cfg = &ch->cfg.board_cfg;
 706                 if (board_cfg->display_off && try_module_get(board_cfg->owner)) {
 707                         board_cfg->display_off(board_cfg->board_data);
 708                         module_put(board_cfg->owner);
 709                 }
 710
 711                 /* disable the meram */
 712                 if (ch->meram_enabled) {
 713                         struct sh_mobile_meram_cfg *cfg;
 714                         struct sh_mobile_meram_info *mdev;
 715                         cfg = ch->cfg.meram_cfg;
 716                         mdev = priv->meram_dev;
 717                         mdev->ops->meram_unregister(mdev, cfg);
 718                         ch->meram_enabled = 0;
 719                 }
 720
 721         }
 722
 723         /* stop the lcdc */
 724         if (priv->started) {
 725                 sh_mobile_lcdc_start_stop(priv, 0);
 726                 priv->started = 0;
 727         }
 728
 729         /* stop clocks */
 730         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 731                 if (priv->ch[k].enabled)
 732                         sh_mobile_lcdc_clk_off(priv);
 733 }
 734
 735 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
 736 {
 737         int interface_type = ch->cfg.interface_type;
 738
 739         switch (interface_type) {
 740         case RGB8:
 741         case RGB9:
 742         case RGB12A:
 743         case RGB12B:
 744         case RGB16:
 745         case RGB18:
 746         case RGB24:
 747         case SYS8A:
 748         case SYS8B:
 749         case SYS8C:
 750         case SYS8D:
 751         case SYS9:
 752         case SYS12:
 753         case SYS16A:
 754         case SYS16B:
 755         case SYS16C:
 756         case SYS18:
 757         case SYS24:
 758                 break;
 759         default:
 760                 return -EINVAL;
 761         }
 762
 763         /* SUBLCD only supports SYS interface */
 764         if (lcdc_chan_is_sublcd(ch)) {
 765                 if (!(interface_type & LDMT1R_IFM))
 766                         return -EINVAL;
 767
 768                 interface_type &= ~LDMT1R_IFM;
 769         }
 770
 771         ch->ldmt1r_value = interface_type;
 772         return 0;
 773 }
 774
 775 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
 776                                        int clock_source,
 777                                        struct sh_mobile_lcdc_priv *priv)
 778 {
 779         char *str;
 780
 781         switch (clock_source) {
 782         case LCDC_CLK_BUS:
 783                 str = "bus_clk";
 784                 priv->lddckr = LDDCKR_ICKSEL_BUS;
 785                 break;
 786         case LCDC_CLK_PERIPHERAL:
 787                 str = "peripheral_clk";
 788                 priv->lddckr = LDDCKR_ICKSEL_MIPI;
 789                 break;
 790         case LCDC_CLK_EXTERNAL:
 791                 str = NULL;
 792                 priv->lddckr = LDDCKR_ICKSEL_HDMI;
 793                 break;
 794         default:
 795                 return -EINVAL;
 796         }
 797
 798         if (str) {
 799                 priv->dot_clk = clk_get(&pdev->dev, str);
 800                 if (IS_ERR(priv->dot_clk)) {
 801                         dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
 802                         return PTR_ERR(priv->dot_clk);
 803                 }
 804         }
 805
 806         /* Runtime PM support involves two step for this driver:
 807          * 1) Enable Runtime PM
 808          * 2) Force Runtime PM Resume since hardware is accessed from probe()
 809          */
 810         priv->dev = &pdev->dev;
 811         pm_runtime_enable(priv->dev);
 812         pm_runtime_resume(priv->dev);
 813         return 0;
 814 }
 815
 816 static int sh_mobile_lcdc_setcolreg(u_int regno,
 817                                     u_int red, u_int green, u_int blue,
 818                                     u_int transp, struct fb_info *info)
 819 {
 820         u32 *palette = info->pseudo_palette;
 821
 822         if (regno >= PALETTE_NR)
 823                 return -EINVAL;
 824
 825         /* only FB_VISUAL_TRUECOLOR supported */
 826
 827         red >>= 16 - info->var.red.length;
 828         green >>= 16 - info->var.green.length;
 829         blue >>= 16 - info->var.blue.length;
 830         transp >>= 16 - info->var.transp.length;
 831
 832         palette[regno] = (red << info->var.red.offset) |
 833           (green << info->var.green.offset) |
 834           (blue << info->var.blue.offset) |
 835           (transp << info->var.transp.offset);
 836
 837         return 0;
 838 }
 839
 840 static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
 841         .id =           "SH Mobile LCDC",
 842         .type =         FB_TYPE_PACKED_PIXELS,
 843         .visual =       FB_VISUAL_TRUECOLOR,
 844         .accel =        FB_ACCEL_NONE,
 845         .xpanstep =     0,
 846         .ypanstep =     1,
 847         .ywrapstep =    0,
 848 };
 849
 850 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
 851                                     const struct fb_fillrect *rect)
 852 {
 853         sys_fillrect(info, rect);
 854         sh_mobile_lcdc_deferred_io_touch(info);
 855 }
 856
 857 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
 858                                     const struct fb_copyarea *area)
 859 {
 860         sys_copyarea(info, area);
 861         sh_mobile_lcdc_deferred_io_touch(info);
 862 }
 863
 864 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
 865                                      const struct fb_image *image)
 866 {
 867         sys_imageblit(info, image);
 868         sh_mobile_lcdc_deferred_io_touch(info);
 869 }
 870
 871 static int sh_mobile_fb_pan_display(struct fb_var_screeninfo *var,
 872                                      struct fb_info *info)
 873 {
 874         struct sh_mobile_lcdc_chan *ch = info->par;
 875         struct sh_mobile_lcdc_priv *priv = ch->lcdc;
 876         unsigned long ldrcntr;
 877         unsigned long new_pan_offset;
 878         unsigned long base_addr_y, base_addr_c;
 879         unsigned long c_offset;
 880
 881         if (!info->var.nonstd)
 882                 new_pan_offset = var->yoffset * info->fix.line_length
 883                                + var->xoffset * (info->var.bits_per_pixel / 8);
 884         else
 885                 new_pan_offset = var->yoffset * info->fix.line_length
 886                                + var->xoffset;
 887
 888         if (new_pan_offset == ch->pan_offset)
 889                 return 0;       /* No change, do nothing */
 890
 891         ldrcntr = lcdc_read(priv, _LDRCNTR);
 892
 893         /* Set the source address for the next refresh */
 894         base_addr_y = ch->dma_handle + new_pan_offset;
 895         if (info->var.nonstd) {
 896                 /* Set y offset */
 897                 c_offset = var->yoffset * info->fix.line_length
 898                          * (info->var.bits_per_pixel - 8) / 8;
 899                 base_addr_c = ch->dma_handle
 900                             + info->var.xres * info->var.yres_virtual
 901                             + c_offset;
 902                 /* Set x offset */
 903                 if (info->var.bits_per_pixel == 24)
 904                         base_addr_c += 2 * var->xoffset;
 905                 else
 906                         base_addr_c += var->xoffset;
 907         }
 908
 909         if (ch->meram_enabled) {
 910                 struct sh_mobile_meram_cfg *cfg;
 911                 struct sh_mobile_meram_info *mdev;
 912                 int ret;
 913
 914                 cfg = ch->cfg.meram_cfg;
 915                 mdev = priv->meram_dev;
 916                 ret = mdev->ops->meram_update(mdev, cfg,
 917                                         base_addr_y, base_addr_c,
 918                                         &base_addr_y, &base_addr_c);
 919                 if (ret)
 920                         return ret;
 921         }
 922
 923         ch->base_addr_y = base_addr_y;
 924         ch->base_addr_c = base_addr_c;
 925
 926         lcdc_write_chan_mirror(ch, LDSA1R, base_addr_y);
 927         if (info->var.nonstd)
 928                 lcdc_write_chan_mirror(ch, LDSA2R, base_addr_c);
 929
 930         if (lcdc_chan_is_sublcd(ch))
 931                 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_SRS);
 932         else
 933                 lcdc_write(ch->lcdc, _LDRCNTR, ldrcntr ^ LDRCNTR_MRS);
 934
 935         ch->pan_offset = new_pan_offset;
 936
 937         sh_mobile_lcdc_deferred_io_touch(info);
 938
 939         return 0;
 940 }
 941
 942 static int sh_mobile_wait_for_vsync(struct fb_info *info)
 943 {
 944         struct sh_mobile_lcdc_chan *ch = info->par;
 945         unsigned long ldintr;
 946         int ret;
 947
 948         /* Enable VSync End interrupt and be careful not to acknowledge any
 949          * pending interrupt.
 950          */
 951         ldintr = lcdc_read(ch->lcdc, _LDINTR);
 952         ldintr |= LDINTR_VEE | LDINTR_STATUS_MASK;
 953         lcdc_write(ch->lcdc, _LDINTR, ldintr);
 954
 955         ret = wait_for_completion_interruptible_timeout(&ch->vsync_completion,
 956                                                         msecs_to_jiffies(100));
 957         if (!ret)
 958                 return -ETIMEDOUT;
 959
 960         return 0;
 961 }
 962
 963 static int sh_mobile_ioctl(struct fb_info *info, unsigned int cmd,
 964                        unsigned long arg)
 965 {
 966         int retval;
 967
 968         switch (cmd) {
 969         case FBIO_WAITFORVSYNC:
 970                 retval = sh_mobile_wait_for_vsync(info);
 971                 break;
 972
 973         default:
 974                 retval = -ENOIOCTLCMD;
 975                 break;
 976         }
 977         return retval;
 978 }
 979
 980 static void sh_mobile_fb_reconfig(struct fb_info *info)
 981 {
 982         struct sh_mobile_lcdc_chan *ch = info->par;
 983         struct fb_videomode mode1, mode2;
 984         struct fb_event event;
 985         int evnt = FB_EVENT_MODE_CHANGE_ALL;
 986
 987         if (ch->use_count > 1 || (ch->use_count == 1 && !info->fbcon_par))
 988                 /* More framebuffer users are active */
 989                 return;
 990
 991         fb_var_to_videomode(&mode1, &ch->display_var);
 992         fb_var_to_videomode(&mode2, &info->var);
 993
 994         if (fb_mode_is_equal(&mode1, &mode2))
 995                 return;
 996
 997         /* Display has been re-plugged, framebuffer is free now, reconfigure */
 998         if (fb_set_var(info, &ch->display_var) < 0)
 999                 /* Couldn't reconfigure, hopefully, can continue as before */
1000                 return;
1001
1002         /*
1003          * fb_set_var() calls the notifier change internally, only if
1004          * FBINFO_MISC_USEREVENT flag is set. Since we do not want to fake a
1005          * user event, we have to call the chain ourselves.
1006          */
1007         event.info = info;
1008         event.data = &mode1;
1009         fb_notifier_call_chain(evnt, &event);
1010 }
1011
1012 /*
1013  * Locking: both .fb_release() and .fb_open() are called with info->lock held if
1014  * user == 1, or with console sem held, if user == 0.
1015  */
1016 static int sh_mobile_release(struct fb_info *info, int user)
1017 {
1018         struct sh_mobile_lcdc_chan *ch = info->par;
1019
1020         mutex_lock(&ch->open_lock);
1021         dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
1022
1023         ch->use_count--;
1024
1025         /* Nothing to reconfigure, when called from fbcon */
1026         if (user) {
1027                 console_lock();
1028                 sh_mobile_fb_reconfig(info);
1029                 console_unlock();
1030         }
1031
1032         mutex_unlock(&ch->open_lock);
1033
1034         return 0;
1035 }
1036
1037 static int sh_mobile_open(struct fb_info *info, int user)
1038 {
1039         struct sh_mobile_lcdc_chan *ch = info->par;
1040
1041         mutex_lock(&ch->open_lock);
1042         ch->use_count++;
1043
1044         dev_dbg(info->dev, "%s(): %d users\n", __func__, ch->use_count);
1045         mutex_unlock(&ch->open_lock);
1046
1047         return 0;
1048 }
1049
1050 static int sh_mobile_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
1051 {
1052         struct sh_mobile_lcdc_chan *ch = info->par;
1053         struct sh_mobile_lcdc_priv *p = ch->lcdc;
1054         unsigned int best_dist = (unsigned int)-1;
1055         unsigned int best_xres = 0;
1056         unsigned int best_yres = 0;
1057         unsigned int i;
1058
1059         if (var->xres > MAX_XRES || var->yres > MAX_YRES)
1060                 return -EINVAL;
1061
1062         /* If board code provides us with a list of available modes, make sure
1063          * we use one of them. Find the mode closest to the requested one. The
1064          * distance between two modes is defined as the size of the
1065          * non-overlapping parts of the two rectangles.
1066          */
1067         for (i = 0; i < ch->cfg.num_cfg; ++i) {
1068                 const struct fb_videomode *mode = &ch->cfg.lcd_cfg[i];
1069                 unsigned int dist;
1070
1071                 /* We can only round up. */
1072                 if (var->xres > mode->xres || var->yres > mode->yres)
1073                         continue;
1074
1075                 dist = var->xres * var->yres + mode->xres * mode->yres
1076                      - 2 * min(var->xres, mode->xres)
1077                          * min(var->yres, mode->yres);
1078
1079                 if (dist < best_dist) {
1080                         best_xres = mode->xres;
1081                         best_yres = mode->yres;
1082                         best_dist = dist;
1083                 }
1084         }
1085
1086         /* If no available mode can be used, return an error. */
1087         if (ch->cfg.num_cfg != 0) {
1088                 if (best_dist == (unsigned int)-1)
1089                         return -EINVAL;
1090
1091                 var->xres = best_xres;
1092                 var->yres = best_yres;
1093         }
1094
1095         /* Make sure the virtual resolution is at least as big as the visible
1096          * resolution.
1097          */
1098         if (var->xres_virtual < var->xres)
1099                 var->xres_virtual = var->xres;
1100         if (var->yres_virtual < var->yres)
1101                 var->yres_virtual = var->yres;
1102
1103         if (var->bits_per_pixel <= 16) {                /* RGB 565 */
1104                 var->bits_per_pixel = 16;
1105                 var->red.offset = 11;
1106                 var->red.length = 5;
1107                 var->green.offset = 5;
1108                 var->green.length = 6;
1109                 var->blue.offset = 0;
1110                 var->blue.length = 5;
1111                 var->transp.offset = 0;
1112                 var->transp.length = 0;
1113         } else if (var->bits_per_pixel <= 24) {         /* RGB 888 */
1114                 var->bits_per_pixel = 24;
1115                 var->red.offset = 16;
1116                 var->red.length = 8;
1117                 var->green.offset = 8;
1118                 var->green.length = 8;
1119                 var->blue.offset = 0;
1120                 var->blue.length = 8;
1121                 var->transp.offset = 0;
1122                 var->transp.length = 0;
1123         } else if (var->bits_per_pixel <= 32) {         /* RGBA 888 */
1124                 var->bits_per_pixel = 32;
1125                 var->red.offset = 16;
1126                 var->red.length = 8;
1127                 var->green.offset = 8;
1128                 var->green.length = 8;
1129                 var->blue.offset = 0;
1130                 var->blue.length = 8;
1131                 var->transp.offset = 24;
1132                 var->transp.length = 8;
1133         } else
1134                 return -EINVAL;
1135
1136         var->red.msb_right = 0;
1137         var->green.msb_right = 0;
1138         var->blue.msb_right = 0;
1139         var->transp.msb_right = 0;
1140
1141         /* Make sure we don't exceed our allocated memory. */
1142         if (var->xres_virtual * var->yres_virtual * var->bits_per_pixel / 8 >
1143             info->fix.smem_len)
1144                 return -EINVAL;
1145
1146         /* only accept the forced_bpp for dual channel configurations */
1147         if (p->forced_bpp && p->forced_bpp != var->bits_per_pixel)
1148                 return -EINVAL;
1149
1150         return 0;
1151 }
1152
1153 static int sh_mobile_set_par(struct fb_info *info)
1154 {
1155         struct sh_mobile_lcdc_chan *ch = info->par;
1156         u32 line_length = info->fix.line_length;
1157         int ret;
1158
1159         sh_mobile_lcdc_stop(ch->lcdc);
1160
1161         if (info->var.nonstd)
1162                 info->fix.line_length = info->var.xres;
1163         else
1164                 info->fix.line_length = info->var.xres
1165                                       * info->var.bits_per_pixel / 8;
1166
1167         ret = sh_mobile_lcdc_start(ch->lcdc);
1168         if (ret < 0) {
1169                 dev_err(info->dev, "%s: unable to restart LCDC\n", __func__);
1170                 info->fix.line_length = line_length;
1171         }
1172
1173         return ret;
1174 }
1175
1176 /*
1177  * Screen blanking. Behavior is as follows:
1178  * FB_BLANK_UNBLANK: screen unblanked, clocks enabled
1179  * FB_BLANK_NORMAL: screen blanked, clocks enabled
1180  * FB_BLANK_VSYNC,
1181  * FB_BLANK_HSYNC,
1182  * FB_BLANK_POWEROFF: screen blanked, clocks disabled
1183  */
1184 static int sh_mobile_lcdc_blank(int blank, struct fb_info *info)
1185 {
1186         struct sh_mobile_lcdc_chan *ch = info->par;
1187         struct sh_mobile_lcdc_priv *p = ch->lcdc;
1188
1189         /* blank the screen? */
1190         if (blank > FB_BLANK_UNBLANK && ch->blank_status == FB_BLANK_UNBLANK) {
1191                 struct fb_fillrect rect = {
1192                         .width = info->var.xres,
1193                         .height = info->var.yres,
1194                 };
1195                 sh_mobile_lcdc_fillrect(info, &rect);
1196         }
1197         /* turn clocks on? */
1198         if (blank <= FB_BLANK_NORMAL && ch->blank_status > FB_BLANK_NORMAL) {
1199                 sh_mobile_lcdc_clk_on(p);
1200         }
1201         /* turn clocks off? */
1202         if (blank > FB_BLANK_NORMAL && ch->blank_status <= FB_BLANK_NORMAL) {
1203                 /* make sure the screen is updated with the black fill before
1204                  * switching the clocks off. one vsync is not enough since
1205                  * blanking may occur in the middle of a refresh. deferred io
1206                  * mode will reenable the clocks and update the screen in time,
1207                  * so it does not need this. */
1208                 if (!info->fbdefio) {
1209                         sh_mobile_wait_for_vsync(info);
1210                         sh_mobile_wait_for_vsync(info);
1211                 }
1212                 sh_mobile_lcdc_clk_off(p);
1213         }
1214
1215         ch->blank_status = blank;
1216         return 0;
1217 }
1218
1219 static struct fb_ops sh_mobile_lcdc_ops = {
1220         .owner          = THIS_MODULE,
1221         .fb_setcolreg   = sh_mobile_lcdc_setcolreg,
1222         .fb_read        = fb_sys_read,
1223         .fb_write       = fb_sys_write,
1224         .fb_fillrect    = sh_mobile_lcdc_fillrect,
1225         .fb_copyarea    = sh_mobile_lcdc_copyarea,
1226         .fb_imageblit   = sh_mobile_lcdc_imageblit,
1227         .fb_blank       = sh_mobile_lcdc_blank,
1228         .fb_pan_display = sh_mobile_fb_pan_display,
1229         .fb_ioctl       = sh_mobile_ioctl,
1230         .fb_open        = sh_mobile_open,
1231         .fb_release     = sh_mobile_release,
1232         .fb_check_var   = sh_mobile_check_var,
1233         .fb_set_par     = sh_mobile_set_par,
1234 };
1235
1236 static int sh_mobile_lcdc_update_bl(struct backlight_device *bdev)
1237 {
1238         struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
1239         struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
1240         int brightness = bdev->props.brightness;
1241
1242         if (bdev->props.power != FB_BLANK_UNBLANK ||
1243             bdev->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
1244                 brightness = 0;
1245
1246         return cfg->set_brightness(cfg->board_data, brightness);
1247 }
1248
1249 static int sh_mobile_lcdc_get_brightness(struct backlight_device *bdev)
1250 {
1251         struct sh_mobile_lcdc_chan *ch = bl_get_data(bdev);
1252         struct sh_mobile_lcdc_board_cfg *cfg = &ch->cfg.board_cfg;
1253
1254         return cfg->get_brightness(cfg->board_data);
1255 }
1256
1257 static int sh_mobile_lcdc_check_fb(struct backlight_device *bdev,
1258                                    struct fb_info *info)
1259 {
1260         return (info->bl_dev == bdev);
1261 }
1262
1263 static struct backlight_ops sh_mobile_lcdc_bl_ops = {
1264         .options        = BL_CORE_SUSPENDRESUME,
1265         .update_status  = sh_mobile_lcdc_update_bl,
1266         .get_brightness = sh_mobile_lcdc_get_brightness,
1267         .check_fb       = sh_mobile_lcdc_check_fb,
1268 };
1269
1270 static struct backlight_device *sh_mobile_lcdc_bl_probe(struct device *parent,
1271                                                struct sh_mobile_lcdc_chan *ch)
1272 {
1273         struct backlight_device *bl;
1274
1275         bl = backlight_device_register(ch->cfg.bl_info.name, parent, ch,
1276                                        &sh_mobile_lcdc_bl_ops, NULL);
1277         if (IS_ERR(bl)) {
1278                 dev_err(parent, "unable to register backlight device: %ld\n",
1279                         PTR_ERR(bl));
1280                 return NULL;
1281         }
1282
1283         bl->props.max_brightness = ch->cfg.bl_info.max_brightness;
1284         bl->props.brightness = bl->props.max_brightness;
1285         backlight_update_status(bl);
1286
1287         return bl;
1288 }
1289
1290 static void sh_mobile_lcdc_bl_remove(struct backlight_device *bdev)
1291 {
1292         backlight_device_unregister(bdev);
1293 }
1294
1295 static int sh_mobile_lcdc_suspend(struct device *dev)
1296 {
1297         struct platform_device *pdev = to_platform_device(dev);
1298
1299         sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
1300         return 0;
1301 }
1302
1303 static int sh_mobile_lcdc_resume(struct device *dev)
1304 {
1305         struct platform_device *pdev = to_platform_device(dev);
1306
1307         return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
1308 }
1309
1310 static int sh_mobile_lcdc_runtime_suspend(struct device *dev)
1311 {
1312         struct platform_device *pdev = to_platform_device(dev);
1313         struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1314
1315         /* turn off LCDC hardware */
1316         lcdc_write(priv, _LDCNT1R, 0);
1317
1318         return 0;
1319 }
1320
1321 static int sh_mobile_lcdc_runtime_resume(struct device *dev)
1322 {
1323         struct platform_device *pdev = to_platform_device(dev);
1324         struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1325
1326         __sh_mobile_lcdc_start(priv);
1327
1328         return 0;
1329 }
1330
1331 static const struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
1332         .suspend = sh_mobile_lcdc_suspend,
1333         .resume = sh_mobile_lcdc_resume,
1334         .runtime_suspend = sh_mobile_lcdc_runtime_suspend,
1335         .runtime_resume = sh_mobile_lcdc_runtime_resume,
1336 };
1337
1338 /* locking: called with info->lock held */
1339 static int sh_mobile_lcdc_notify(struct notifier_block *nb,
1340                                  unsigned long action, void *data)
1341 {
1342         struct fb_event *event = data;
1343         struct fb_info *info = event->info;
1344         struct sh_mobile_lcdc_chan *ch = info->par;
1345         struct sh_mobile_lcdc_board_cfg *board_cfg = &ch->cfg.board_cfg;
1346
1347         if (&ch->lcdc->notifier != nb)
1348                 return NOTIFY_DONE;
1349
1350         dev_dbg(info->dev, "%s(): action = %lu, data = %p\n",
1351                 __func__, action, event->data);
1352
1353         switch(action) {
1354         case FB_EVENT_SUSPEND:
1355                 if (board_cfg->display_off && try_module_get(board_cfg->owner)) {
1356                         board_cfg->display_off(board_cfg->board_data);
1357                         module_put(board_cfg->owner);
1358                 }
1359                 sh_mobile_lcdc_stop(ch->lcdc);
1360                 break;
1361         case FB_EVENT_RESUME:
1362                 mutex_lock(&ch->open_lock);
1363                 sh_mobile_fb_reconfig(info);
1364                 mutex_unlock(&ch->open_lock);
1365
1366                 /* HDMI must be enabled before LCDC configuration */
1367                 if (board_cfg->display_on && try_module_get(board_cfg->owner)) {
1368                         board_cfg->display_on(board_cfg->board_data, info);
1369                         module_put(board_cfg->owner);
1370                 }
1371
1372                 sh_mobile_lcdc_start(ch->lcdc);
1373         }
1374
1375         return NOTIFY_OK;
1376 }
1377
1378 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
1379 {
1380         struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
1381         struct fb_info *info;
1382         int i;
1383
1384         fb_unregister_client(&priv->notifier);
1385
1386         for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
1387                 if (priv->ch[i].info && priv->ch[i].info->dev)
1388                         unregister_framebuffer(priv->ch[i].info);
1389
1390         sh_mobile_lcdc_stop(priv);
1391
1392         for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1393                 info = priv->ch[i].info;
1394
1395                 if (!info || !info->device)
1396                         continue;
1397
1398                 if (priv->ch[i].sglist)
1399                         vfree(priv->ch[i].sglist);
1400
1401                 if (info->screen_base)
1402                         dma_free_coherent(&pdev->dev, info->fix.smem_len,
1403                                           info->screen_base,
1404                                           priv->ch[i].dma_handle);
1405                 fb_dealloc_cmap(&info->cmap);
1406                 framebuffer_release(info);
1407         }
1408
1409         for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
1410                 if (priv->ch[i].bl)
1411                         sh_mobile_lcdc_bl_remove(priv->ch[i].bl);
1412         }
1413
1414         if (priv->dot_clk)
1415                 clk_put(priv->dot_clk);
1416
1417         if (priv->dev)
1418                 pm_runtime_disable(priv->dev);
1419
1420         if (priv->base)
1421                 iounmap(priv->base);
1422
1423         if (priv->irq)
1424                 free_irq(priv->irq, priv);
1425         kfree(priv);
1426         return 0;
1427 }
1428
1429 static int __devinit sh_mobile_lcdc_channel_init(struct sh_mobile_lcdc_chan *ch,
1430                                                  struct device *dev)
1431 {
1432         struct sh_mobile_lcdc_chan_cfg *cfg = &ch->cfg;
1433         const struct fb_videomode *max_mode;
1434         const struct fb_videomode *mode;
1435         struct fb_var_screeninfo *var;
1436         struct fb_info *info;
1437         unsigned int max_size;
1438         int num_cfg;
1439         void *buf;
1440         int ret;
1441         int i;
1442
1443         mutex_init(&ch->open_lock);
1444
1445         /* Allocate the frame buffer device. */
1446         ch->info = framebuffer_alloc(0, dev);
1447         if (!ch->info) {
1448                 dev_err(dev, "unable to allocate fb_info\n");
1449                 return -ENOMEM;
1450         }
1451
1452         info = ch->info;
1453         info->fbops = &sh_mobile_lcdc_ops;
1454         info->par = ch;
1455         info->pseudo_palette = &ch->pseudo_palette;
1456         info->flags = FBINFO_FLAG_DEFAULT;
1457
1458         /* Iterate through the modes to validate them and find the highest
1459          * resolution.
1460          */
1461         max_mode = NULL;
1462         max_size = 0;
1463
1464         for (i = 0, mode = cfg->lcd_cfg; i < cfg->num_cfg; i++, mode++) {
1465                 unsigned int size = mode->yres * mode->xres;
1466
1467                 /* NV12 buffers must have even number of lines */
1468                 if ((cfg->nonstd) && cfg->bpp == 12 &&
1469                                 (mode->yres & 0x1)) {
1470                         dev_err(dev, "yres must be multiple of 2 for YCbCr420 "
1471                                 "mode.\n");
1472                         return -EINVAL;
1473                 }
1474
1475                 if (size > max_size) {
1476                         max_mode = mode;
1477                         max_size = size;
1478                 }
1479         }
1480
1481         if (!max_size)
1482                 max_size = MAX_XRES * MAX_YRES;
1483         else
1484                 dev_dbg(dev, "Found largest videomode %ux%u\n",
1485                         max_mode->xres, max_mode->yres);
1486
1487         /* Initialize fixed screen information. Restrict pan to 2 lines steps
1488          * for NV12.
1489          */
1490         info->fix = sh_mobile_lcdc_fix;
1491         info->fix.smem_len = max_size * 2 * cfg->bpp / 8;
1492         if (cfg->nonstd && cfg->bpp == 12)
1493                 info->fix.ypanstep = 2;
1494
1495         /* Create the mode list. */
1496         if (cfg->lcd_cfg == NULL) {
1497                 mode = &default_720p;
1498                 num_cfg = 1;
1499         } else {
1500                 mode = cfg->lcd_cfg;
1501                 num_cfg = cfg->num_cfg;
1502         }
1503
1504         fb_videomode_to_modelist(mode, num_cfg, &info->modelist);
1505
1506         /* Initialize variable screen information using the first mode as
1507          * default. The default Y virtual resolution is twice the panel size to
1508          * allow for double-buffering.
1509          */
1510         var = &info->var;
1511         fb_videomode_to_var(var, mode);
1512         var->bits_per_pixel = cfg->bpp;
1513         var->width = cfg->lcd_size_cfg.width;
1514         var->height = cfg->lcd_size_cfg.height;
1515         var->yres_virtual = var->yres * 2;
1516         var->activate = FB_ACTIVATE_NOW;
1517
1518         ret = sh_mobile_check_var(var, info);
1519         if (ret)
1520                 return ret;
1521
1522         /* Allocate frame buffer memory and color map. */
1523         buf = dma_alloc_coherent(dev, info->fix.smem_len, &ch->dma_handle,
1524                                  GFP_KERNEL);
1525         if (!buf) {
1526                 dev_err(dev, "unable to allocate buffer\n");
1527                 return -ENOMEM;
1528         }
1529
1530         ret = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
1531         if (ret < 0) {
1532                 dev_err(dev, "unable to allocate cmap\n");
1533                 dma_free_coherent(dev, info->fix.smem_len,
1534                                   buf, ch->dma_handle);
1535                 return ret;
1536         }
1537
1538         info->fix.smem_start = ch->dma_handle;
1539         if (var->nonstd)
1540                 info->fix.line_length = var->xres;
1541         else
1542                 info->fix.line_length = var->xres * (cfg->bpp / 8);
1543
1544         info->screen_base = buf;
1545         info->device = dev;
1546         ch->display_var = *var;
1547
1548         return 0;
1549 }
1550
1551 static int __devinit sh_mobile_lcdc_probe(struct platform_device *pdev)
1552 {
1553         struct sh_mobile_lcdc_info *pdata = pdev->dev.platform_data;
1554         struct sh_mobile_lcdc_priv *priv;
1555         struct resource *res;
1556         int num_channels;
1557         int error;
1558         int i;
1559
1560         if (!pdata) {
1561                 dev_err(&pdev->dev, "no platform data defined\n");
1562                 return -EINVAL;
1563         }
1564
1565         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1566         i = platform_get_irq(pdev, 0);
1567         if (!res || i < 0) {
1568                 dev_err(&pdev->dev, "cannot get platform resources\n");
1569                 return -ENOENT;
1570         }
1571
1572         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
1573         if (!priv) {
1574                 dev_err(&pdev->dev, "cannot allocate device data\n");
1575                 return -ENOMEM;
1576         }
1577
1578         platform_set_drvdata(pdev, priv);
1579
1580         error = request_irq(i, sh_mobile_lcdc_irq, 0,
1581                             dev_name(&pdev->dev), priv);
1582         if (error) {
1583                 dev_err(&pdev->dev, "unable to request irq\n");
1584                 goto err1;
1585         }
1586
1587         priv->irq = i;
1588         atomic_set(&priv->hw_usecnt, -1);
1589
1590         for (i = 0, num_channels = 0; i < ARRAY_SIZE(pdata->ch); i++) {
1591                 struct sh_mobile_lcdc_chan *ch = priv->ch + num_channels;
1592
1593                 ch->lcdc = priv;
1594                 memcpy(&ch->cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
1595
1596                 error = sh_mobile_lcdc_check_interface(ch);
1597                 if (error) {
1598                         dev_err(&pdev->dev, "unsupported interface type\n");
1599                         goto err1;
1600                 }
1601                 init_waitqueue_head(&ch->frame_end_wait);
1602                 init_completion(&ch->vsync_completion);
1603                 ch->pan_offset = 0;
1604
1605                 /* probe the backlight is there is one defined */
1606                 if (ch->cfg.bl_info.max_brightness)
1607                         ch->bl = sh_mobile_lcdc_bl_probe(&pdev->dev, ch);
1608
1609                 switch (pdata->ch[i].chan) {
1610                 case LCDC_CHAN_MAINLCD:
1611                         ch->enabled = LDCNT2R_ME;
1612                         ch->reg_offs = lcdc_offs_mainlcd;
1613                         num_channels++;
1614                         break;
1615                 case LCDC_CHAN_SUBLCD:
1616                         ch->enabled = LDCNT2R_SE;
1617                         ch->reg_offs = lcdc_offs_sublcd;
1618                         num_channels++;
1619                         break;
1620                 }
1621         }
1622
1623         if (!num_channels) {
1624                 dev_err(&pdev->dev, "no channels defined\n");
1625                 error = -EINVAL;
1626                 goto err1;
1627         }
1628
1629         /* for dual channel LCDC (MAIN + SUB) force shared bpp setting */
1630         if (num_channels == 2)
1631                 priv->forced_bpp = pdata->ch[0].bpp;
1632
1633         priv->base = ioremap_nocache(res->start, resource_size(res));
1634         if (!priv->base)
1635                 goto err1;
1636
1637         error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
1638         if (error) {
1639                 dev_err(&pdev->dev, "unable to setup clocks\n");
1640                 goto err1;
1641         }
1642
1643         priv->meram_dev = pdata->meram_dev;
1644
1645         for (i = 0; i < num_channels; i++) {
1646                 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1647
1648                 error = sh_mobile_lcdc_channel_init(ch, &pdev->dev);
1649                 if (error)
1650                         goto err1;
1651         }
1652
1653         error = sh_mobile_lcdc_start(priv);
1654         if (error) {
1655                 dev_err(&pdev->dev, "unable to start hardware\n");
1656                 goto err1;
1657         }
1658
1659         for (i = 0; i < num_channels; i++) {
1660                 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
1661                 struct fb_info *info = ch->info;
1662
1663                 if (info->fbdefio) {
1664                         ch->sglist = vmalloc(sizeof(struct scatterlist) *
1665                                         info->fix.smem_len >> PAGE_SHIFT);
1666                         if (!ch->sglist) {
1667                                 dev_err(&pdev->dev, "cannot allocate sglist\n");
1668                                 goto err1;
1669                         }
1670                 }
1671
1672                 info->bl_dev = ch->bl;
1673
1674                 error = register_framebuffer(info);
1675                 if (error < 0)
1676                         goto err1;
1677
1678                 dev_info(info->dev,
1679                          "registered %s/%s as %dx%d %dbpp.\n",
1680                          pdev->name,
1681                          (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
1682                          "mainlcd" : "sublcd",
1683                          info->var.xres, info->var.yres,
1684                          ch->cfg.bpp);
1685
1686                 /* deferred io mode: disable clock to save power */
1687                 if (info->fbdefio || info->state == FBINFO_STATE_SUSPENDED)
1688                         sh_mobile_lcdc_clk_off(priv);
1689         }
1690
1691         /* Failure ignored */
1692         priv->notifier.notifier_call = sh_mobile_lcdc_notify;
1693         fb_register_client(&priv->notifier);
1694
1695         return 0;
1696 err1:
1697         sh_mobile_lcdc_remove(pdev);
1698
1699         return error;
1700 }
1701
1702 static struct platform_driver sh_mobile_lcdc_driver = {
1703         .driver         = {
1704                 .name           = "sh_mobile_lcdc_fb",
1705                 .owner          = THIS_MODULE,
1706                 .pm             = &sh_mobile_lcdc_dev_pm_ops,
1707         },
1708         .probe          = sh_mobile_lcdc_probe,
1709         .remove         = sh_mobile_lcdc_remove,
1710 };
1711
1712 static int __init sh_mobile_lcdc_init(void)
1713 {
1714         return platform_driver_register(&sh_mobile_lcdc_driver);
1715 }
1716
1717 static void __exit sh_mobile_lcdc_exit(void)
1718 {
1719         platform_driver_unregister(&sh_mobile_lcdc_driver);
1720 }
1721
1722 module_init(sh_mobile_lcdc_init);
1723 module_exit(sh_mobile_lcdc_exit);
1724
1725 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
1726 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
1727 MODULE_LICENSE("GPL v2");