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