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/fb.h>
  16 #include <linux/clk.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 <video/sh_mobile_lcdc.h>
  22 #include <asm/atomic.h>
  23
  24 #define PALETTE_NR 16
  25
  26 struct sh_mobile_lcdc_priv;
  27 struct sh_mobile_lcdc_chan {
  28         struct sh_mobile_lcdc_priv *lcdc;
  29         unsigned long *reg_offs;
  30         unsigned long ldmt1r_value;
  31         unsigned long enabled; /* ME and SE in LDCNT2R */
  32         struct sh_mobile_lcdc_chan_cfg cfg;
  33         u32 pseudo_palette[PALETTE_NR];
  34         struct fb_info *info;
  35         dma_addr_t dma_handle;
  36         struct fb_deferred_io defio;
  37         struct scatterlist *sglist;
  38         unsigned long frame_end;
  39         wait_queue_head_t frame_end_wait;
  40 };
  41
  42 struct sh_mobile_lcdc_priv {
  43         void __iomem *base;
  44         int irq;
  45 #ifdef CONFIG_HAVE_CLK
  46         atomic_t clk_usecnt;
  47         struct clk *dot_clk;
  48         struct clk *clk;
  49 #endif
  50         unsigned long lddckr;
  51         struct sh_mobile_lcdc_chan ch[2];
  52         int started;
  53 };
  54
  55 /* shared registers */
  56 #define _LDDCKR 0x410
  57 #define _LDDCKSTPR 0x414
  58 #define _LDINTR 0x468
  59 #define _LDSR 0x46c
  60 #define _LDCNT1R 0x470
  61 #define _LDCNT2R 0x474
  62 #define _LDDDSR 0x47c
  63 #define _LDDWD0R 0x800
  64 #define _LDDRDR 0x840
  65 #define _LDDWAR 0x900
  66 #define _LDDRAR 0x904
  67
  68 /* per-channel registers */
  69 enum { LDDCKPAT1R, LDDCKPAT2R, LDMT1R, LDMT2R, LDMT3R, LDDFR, LDSM1R,
  70        LDSM2R, LDSA1R, LDMLSR, LDHCNR, LDHSYNR, LDVLNR, LDVSYNR, LDPMR };
  71
  72 static unsigned long lcdc_offs_mainlcd[] = {
  73         [LDDCKPAT1R] = 0x400,
  74         [LDDCKPAT2R] = 0x404,
  75         [LDMT1R] = 0x418,
  76         [LDMT2R] = 0x41c,
  77         [LDMT3R] = 0x420,
  78         [LDDFR] = 0x424,
  79         [LDSM1R] = 0x428,
  80         [LDSM2R] = 0x42c,
  81         [LDSA1R] = 0x430,
  82         [LDMLSR] = 0x438,
  83         [LDHCNR] = 0x448,
  84         [LDHSYNR] = 0x44c,
  85         [LDVLNR] = 0x450,
  86         [LDVSYNR] = 0x454,
  87         [LDPMR] = 0x460,
  88 };
  89
  90 static unsigned long lcdc_offs_sublcd[] = {
  91         [LDDCKPAT1R] = 0x408,
  92         [LDDCKPAT2R] = 0x40c,
  93         [LDMT1R] = 0x600,
  94         [LDMT2R] = 0x604,
  95         [LDMT3R] = 0x608,
  96         [LDDFR] = 0x60c,
  97         [LDSM1R] = 0x610,
  98         [LDSM2R] = 0x614,
  99         [LDSA1R] = 0x618,
 100         [LDMLSR] = 0x620,
 101         [LDHCNR] = 0x624,
 102         [LDHSYNR] = 0x628,
 103         [LDVLNR] = 0x62c,
 104         [LDVSYNR] = 0x630,
 105         [LDPMR] = 0x63c,
 106 };
 107
 108 #define START_LCDC      0x00000001
 109 #define LCDC_RESET      0x00000100
 110 #define DISPLAY_BEU     0x00000008
 111 #define LCDC_ENABLE     0x00000001
 112 #define LDINTR_FE       0x00000400
 113 #define LDINTR_FS       0x00000004
 114
 115 static void lcdc_write_chan(struct sh_mobile_lcdc_chan *chan,
 116                             int reg_nr, unsigned long data)
 117 {
 118         iowrite32(data, chan->lcdc->base + chan->reg_offs[reg_nr]);
 119 }
 120
 121 static unsigned long lcdc_read_chan(struct sh_mobile_lcdc_chan *chan,
 122                                     int reg_nr)
 123 {
 124         return ioread32(chan->lcdc->base + chan->reg_offs[reg_nr]);
 125 }
 126
 127 static void lcdc_write(struct sh_mobile_lcdc_priv *priv,
 128                        unsigned long reg_offs, unsigned long data)
 129 {
 130         iowrite32(data, priv->base + reg_offs);
 131 }
 132
 133 static unsigned long lcdc_read(struct sh_mobile_lcdc_priv *priv,
 134                                unsigned long reg_offs)
 135 {
 136         return ioread32(priv->base + reg_offs);
 137 }
 138
 139 static void lcdc_wait_bit(struct sh_mobile_lcdc_priv *priv,
 140                           unsigned long reg_offs,
 141                           unsigned long mask, unsigned long until)
 142 {
 143         while ((lcdc_read(priv, reg_offs) & mask) != until)
 144                 cpu_relax();
 145 }
 146
 147 static int lcdc_chan_is_sublcd(struct sh_mobile_lcdc_chan *chan)
 148 {
 149         return chan->cfg.chan == LCDC_CHAN_SUBLCD;
 150 }
 151
 152 static void lcdc_sys_write_index(void *handle, unsigned long data)
 153 {
 154         struct sh_mobile_lcdc_chan *ch = handle;
 155
 156         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x10000000);
 157         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 158         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 159 }
 160
 161 static void lcdc_sys_write_data(void *handle, unsigned long data)
 162 {
 163         struct sh_mobile_lcdc_chan *ch = handle;
 164
 165         lcdc_write(ch->lcdc, _LDDWD0R, data | 0x11000000);
 166         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 167         lcdc_write(ch->lcdc, _LDDWAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 168 }
 169
 170 static unsigned long lcdc_sys_read_data(void *handle)
 171 {
 172         struct sh_mobile_lcdc_chan *ch = handle;
 173
 174         lcdc_write(ch->lcdc, _LDDRDR, 0x01000000);
 175         lcdc_wait_bit(ch->lcdc, _LDSR, 2, 0);
 176         lcdc_write(ch->lcdc, _LDDRAR, 1 | (lcdc_chan_is_sublcd(ch) ? 2 : 0));
 177         udelay(1);
 178
 179         return lcdc_read(ch->lcdc, _LDDRDR) & 0xffff;
 180 }
 181
 182 struct sh_mobile_lcdc_sys_bus_ops sh_mobile_lcdc_sys_bus_ops = {
 183         lcdc_sys_write_index,
 184         lcdc_sys_write_data,
 185         lcdc_sys_read_data,
 186 };
 187
 188 #ifdef CONFIG_HAVE_CLK
 189 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv)
 190 {
 191         if (atomic_inc_and_test(&priv->clk_usecnt)) {
 192                 clk_enable(priv->clk);
 193                 if (priv->dot_clk)
 194                         clk_enable(priv->dot_clk);
 195         }
 196 }
 197
 198 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv)
 199 {
 200         if (atomic_sub_return(1, &priv->clk_usecnt) == -1) {
 201                 if (priv->dot_clk)
 202                         clk_disable(priv->dot_clk);
 203                 clk_disable(priv->clk);
 204         }
 205 }
 206 #else
 207 static void sh_mobile_lcdc_clk_on(struct sh_mobile_lcdc_priv *priv) {}
 208 static void sh_mobile_lcdc_clk_off(struct sh_mobile_lcdc_priv *priv) {}
 209 #endif
 210
 211 static int sh_mobile_lcdc_sginit(struct fb_info *info,
 212                                   struct list_head *pagelist)
 213 {
 214         struct sh_mobile_lcdc_chan *ch = info->par;
 215         unsigned int nr_pages_max = info->fix.smem_len >> PAGE_SHIFT;
 216         struct page *page;
 217         int nr_pages = 0;
 218
 219         sg_init_table(ch->sglist, nr_pages_max);
 220
 221         list_for_each_entry(page, pagelist, lru)
 222                 sg_set_page(&ch->sglist[nr_pages++], page, PAGE_SIZE, 0);
 223
 224         return nr_pages;
 225 }
 226
 227 static void sh_mobile_lcdc_deferred_io(struct fb_info *info,
 228                                        struct list_head *pagelist)
 229 {
 230         struct sh_mobile_lcdc_chan *ch = info->par;
 231         unsigned int nr_pages;
 232
 233         /* enable clocks before accessing hardware */
 234         sh_mobile_lcdc_clk_on(ch->lcdc);
 235
 236         nr_pages = sh_mobile_lcdc_sginit(info, pagelist);
 237         dma_map_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
 238
 239         /* trigger panel update */
 240         lcdc_write_chan(ch, LDSM2R, 1);
 241
 242         dma_unmap_sg(info->dev, ch->sglist, nr_pages, DMA_TO_DEVICE);
 243 }
 244
 245 static void sh_mobile_lcdc_deferred_io_touch(struct fb_info *info)
 246 {
 247         struct fb_deferred_io *fbdefio = info->fbdefio;
 248
 249         if (fbdefio)
 250                 schedule_delayed_work(&info->deferred_work, fbdefio->delay);
 251 }
 252
 253 static irqreturn_t sh_mobile_lcdc_irq(int irq, void *data)
 254 {
 255         struct sh_mobile_lcdc_priv *priv = data;
 256         struct sh_mobile_lcdc_chan *ch;
 257         unsigned long tmp;
 258         int is_sub;
 259         int k;
 260
 261         /* acknowledge interrupt */
 262         tmp = lcdc_read(priv, _LDINTR);
 263         tmp &= 0xffffff00; /* mask in high 24 bits */
 264         tmp |= 0x000000ff ^ LDINTR_FS; /* status in low 8 */
 265         lcdc_write(priv, _LDINTR, tmp);
 266
 267         /* figure out if this interrupt is for main or sub lcd */
 268         is_sub = (lcdc_read(priv, _LDSR) & (1 << 10)) ? 1 : 0;
 269
 270         /* wake up channel and disable clocks*/
 271         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 272                 ch = &priv->ch[k];
 273
 274                 if (!ch->enabled)
 275                         continue;
 276
 277                 if (is_sub == lcdc_chan_is_sublcd(ch)) {
 278                         ch->frame_end = 1;
 279                         wake_up(&ch->frame_end_wait);
 280
 281                         sh_mobile_lcdc_clk_off(priv);
 282                 }
 283         }
 284
 285         return IRQ_HANDLED;
 286 }
 287
 288 static void sh_mobile_lcdc_start_stop(struct sh_mobile_lcdc_priv *priv,
 289                                       int start)
 290 {
 291         unsigned long tmp = lcdc_read(priv, _LDCNT2R);
 292         int k;
 293
 294         /* start or stop the lcdc */
 295         if (start)
 296                 lcdc_write(priv, _LDCNT2R, tmp | START_LCDC);
 297         else
 298                 lcdc_write(priv, _LDCNT2R, tmp & ~START_LCDC);
 299
 300         /* wait until power is applied/stopped on all channels */
 301         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 302                 if (lcdc_read(priv, _LDCNT2R) & priv->ch[k].enabled)
 303                         while (1) {
 304                                 tmp = lcdc_read_chan(&priv->ch[k], LDPMR) & 3;
 305                                 if (start && tmp == 3)
 306                                         break;
 307                                 if (!start && tmp == 0)
 308                                         break;
 309                                 cpu_relax();
 310                         }
 311
 312         if (!start)
 313                 lcdc_write(priv, _LDDCKSTPR, 1); /* stop dotclock */
 314 }
 315
 316 static int sh_mobile_lcdc_start(struct sh_mobile_lcdc_priv *priv)
 317 {
 318         struct sh_mobile_lcdc_chan *ch;
 319         struct fb_videomode *lcd_cfg;
 320         struct sh_mobile_lcdc_board_cfg *board_cfg;
 321         unsigned long tmp;
 322         int k, m;
 323         int ret = 0;
 324
 325         /* enable clocks before accessing the hardware */
 326         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 327                 if (priv->ch[k].enabled)
 328                         sh_mobile_lcdc_clk_on(priv);
 329
 330         /* reset */
 331         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) | LCDC_RESET);
 332         lcdc_wait_bit(priv, _LDCNT2R, LCDC_RESET, 0);
 333
 334         /* enable LCDC channels */
 335         tmp = lcdc_read(priv, _LDCNT2R);
 336         tmp |= priv->ch[0].enabled;
 337         tmp |= priv->ch[1].enabled;
 338         lcdc_write(priv, _LDCNT2R, tmp);
 339
 340         /* read data from external memory, avoid using the BEU for now */
 341         lcdc_write(priv, _LDCNT2R, lcdc_read(priv, _LDCNT2R) & ~DISPLAY_BEU);
 342
 343         /* stop the lcdc first */
 344         sh_mobile_lcdc_start_stop(priv, 0);
 345
 346         /* configure clocks */
 347         tmp = priv->lddckr;
 348         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 349                 ch = &priv->ch[k];
 350
 351                 if (!priv->ch[k].enabled)
 352                         continue;
 353
 354                 m = ch->cfg.clock_divider;
 355                 if (!m)
 356                         continue;
 357
 358                 if (m == 1)
 359                         m = 1 << 6;
 360                 tmp |= m << (lcdc_chan_is_sublcd(ch) ? 8 : 0);
 361
 362                 lcdc_write_chan(ch, LDDCKPAT1R, 0x00000000);
 363                 lcdc_write_chan(ch, LDDCKPAT2R, (1 << (m/2)) - 1);
 364         }
 365
 366         lcdc_write(priv, _LDDCKR, tmp);
 367
 368         /* start dotclock again */
 369         lcdc_write(priv, _LDDCKSTPR, 0);
 370         lcdc_wait_bit(priv, _LDDCKSTPR, ~0, 0);
 371
 372         /* interrupts are disabled to begin with */
 373         lcdc_write(priv, _LDINTR, 0);
 374
 375         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 376                 ch = &priv->ch[k];
 377                 lcd_cfg = &ch->cfg.lcd_cfg;
 378
 379                 if (!ch->enabled)
 380                         continue;
 381
 382                 tmp = ch->ldmt1r_value;
 383                 tmp |= (lcd_cfg->sync & FB_SYNC_VERT_HIGH_ACT) ? 0 : 1 << 28;
 384                 tmp |= (lcd_cfg->sync & FB_SYNC_HOR_HIGH_ACT) ? 0 : 1 << 27;
 385                 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWPOL) ? 1 << 26 : 0;
 386                 tmp |= (ch->cfg.flags & LCDC_FLAGS_DIPOL) ? 1 << 25 : 0;
 387                 tmp |= (ch->cfg.flags & LCDC_FLAGS_DAPOL) ? 1 << 24 : 0;
 388                 tmp |= (ch->cfg.flags & LCDC_FLAGS_HSCNT) ? 1 << 17 : 0;
 389                 tmp |= (ch->cfg.flags & LCDC_FLAGS_DWCNT) ? 1 << 16 : 0;
 390                 lcdc_write_chan(ch, LDMT1R, tmp);
 391
 392                 /* setup SYS bus */
 393                 lcdc_write_chan(ch, LDMT2R, ch->cfg.sys_bus_cfg.ldmt2r);
 394                 lcdc_write_chan(ch, LDMT3R, ch->cfg.sys_bus_cfg.ldmt3r);
 395
 396                 /* horizontal configuration */
 397                 tmp = lcd_cfg->xres + lcd_cfg->hsync_len;
 398                 tmp += lcd_cfg->left_margin;
 399                 tmp += lcd_cfg->right_margin;
 400                 tmp /= 8; /* HTCN */
 401                 tmp |= (lcd_cfg->xres / 8) << 16; /* HDCN */
 402                 lcdc_write_chan(ch, LDHCNR, tmp);
 403
 404                 tmp = lcd_cfg->xres;
 405                 tmp += lcd_cfg->right_margin;
 406                 tmp /= 8; /* HSYNP */
 407                 tmp |= (lcd_cfg->hsync_len / 8) << 16; /* HSYNW */
 408                 lcdc_write_chan(ch, LDHSYNR, tmp);
 409
 410                 /* power supply */
 411                 lcdc_write_chan(ch, LDPMR, 0);
 412
 413                 /* vertical configuration */
 414                 tmp = lcd_cfg->yres + lcd_cfg->vsync_len;
 415                 tmp += lcd_cfg->upper_margin;
 416                 tmp += lcd_cfg->lower_margin; /* VTLN */
 417                 tmp |= lcd_cfg->yres << 16; /* VDLN */
 418                 lcdc_write_chan(ch, LDVLNR, tmp);
 419
 420                 tmp = lcd_cfg->yres;
 421                 tmp += lcd_cfg->lower_margin; /* VSYNP */
 422                 tmp |= lcd_cfg->vsync_len << 16; /* VSYNW */
 423                 lcdc_write_chan(ch, LDVSYNR, tmp);
 424
 425                 board_cfg = &ch->cfg.board_cfg;
 426                 if (board_cfg->setup_sys)
 427                         ret = board_cfg->setup_sys(board_cfg->board_data, ch,
 428                                                    &sh_mobile_lcdc_sys_bus_ops);
 429                 if (ret)
 430                         return ret;
 431         }
 432
 433         /* word and long word swap */
 434         lcdc_write(priv, _LDDDSR, lcdc_read(priv, _LDDDSR) | 6);
 435
 436         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 437                 ch = &priv->ch[k];
 438
 439                 if (!priv->ch[k].enabled)
 440                         continue;
 441
 442                 /* set bpp format in PKF[4:0] */
 443                 tmp = lcdc_read_chan(ch, LDDFR);
 444                 tmp &= ~(0x0001001f);
 445                 tmp |= (ch->info->var.bits_per_pixel == 16) ? 3 : 0;
 446                 lcdc_write_chan(ch, LDDFR, tmp);
 447
 448                 /* point out our frame buffer */
 449                 lcdc_write_chan(ch, LDSA1R, ch->info->fix.smem_start);
 450
 451                 /* set line size */
 452                 lcdc_write_chan(ch, LDMLSR, ch->info->fix.line_length);
 453
 454                 /* setup deferred io if SYS bus */
 455                 tmp = ch->cfg.sys_bus_cfg.deferred_io_msec;
 456                 if (ch->ldmt1r_value & (1 << 12) && tmp) {
 457                         ch->defio.deferred_io = sh_mobile_lcdc_deferred_io;
 458                         ch->defio.delay = msecs_to_jiffies(tmp);
 459                         ch->info->fbdefio = &ch->defio;
 460                         fb_deferred_io_init(ch->info);
 461
 462                         /* one-shot mode */
 463                         lcdc_write_chan(ch, LDSM1R, 1);
 464
 465                         /* enable "Frame End Interrupt Enable" bit */
 466                         lcdc_write(priv, _LDINTR, LDINTR_FE);
 467
 468                 } else {
 469                         /* continuous read mode */
 470                         lcdc_write_chan(ch, LDSM1R, 0);
 471                 }
 472         }
 473
 474         /* display output */
 475         lcdc_write(priv, _LDCNT1R, LCDC_ENABLE);
 476
 477         /* start the lcdc */
 478         sh_mobile_lcdc_start_stop(priv, 1);
 479         priv->started = 1;
 480
 481         /* tell the board code to enable the panel */
 482         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 483                 ch = &priv->ch[k];
 484                 board_cfg = &ch->cfg.board_cfg;
 485                 if (board_cfg->display_on)
 486                         board_cfg->display_on(board_cfg->board_data);
 487         }
 488
 489         return 0;
 490 }
 491
 492 static void sh_mobile_lcdc_stop(struct sh_mobile_lcdc_priv *priv)
 493 {
 494         struct sh_mobile_lcdc_chan *ch;
 495         struct sh_mobile_lcdc_board_cfg *board_cfg;
 496         int k;
 497
 498         /* clean up deferred io and ask board code to disable panel */
 499         for (k = 0; k < ARRAY_SIZE(priv->ch); k++) {
 500                 ch = &priv->ch[k];
 501
 502                 /* deferred io mode:
 503                  * flush frame, and wait for frame end interrupt
 504                  * clean up deferred io and enable clock
 505                  */
 506                 if (ch->info->fbdefio) {
 507                         ch->frame_end = 0;
 508                         schedule_delayed_work(&ch->info->deferred_work, 0);
 509                         wait_event(ch->frame_end_wait, ch->frame_end);
 510                         fb_deferred_io_cleanup(ch->info);
 511                         ch->info->fbdefio = NULL;
 512                         sh_mobile_lcdc_clk_on(priv);
 513                 }
 514
 515                 board_cfg = &ch->cfg.board_cfg;
 516                 if (board_cfg->display_off)
 517                         board_cfg->display_off(board_cfg->board_data);
 518
 519         }
 520
 521         /* stop the lcdc */
 522         if (priv->started) {
 523                 sh_mobile_lcdc_start_stop(priv, 0);
 524                 priv->started = 0;
 525         }
 526
 527         /* stop clocks */
 528         for (k = 0; k < ARRAY_SIZE(priv->ch); k++)
 529                 if (priv->ch[k].enabled)
 530                         sh_mobile_lcdc_clk_off(priv);
 531 }
 532
 533 static int sh_mobile_lcdc_check_interface(struct sh_mobile_lcdc_chan *ch)
 534 {
 535         int ifm, miftyp;
 536
 537         switch (ch->cfg.interface_type) {
 538         case RGB8: ifm = 0; miftyp = 0; break;
 539         case RGB9: ifm = 0; miftyp = 4; break;
 540         case RGB12A: ifm = 0; miftyp = 5; break;
 541         case RGB12B: ifm = 0; miftyp = 6; break;
 542         case RGB16: ifm = 0; miftyp = 7; break;
 543         case RGB18: ifm = 0; miftyp = 10; break;
 544         case RGB24: ifm = 0; miftyp = 11; break;
 545         case SYS8A: ifm = 1; miftyp = 0; break;
 546         case SYS8B: ifm = 1; miftyp = 1; break;
 547         case SYS8C: ifm = 1; miftyp = 2; break;
 548         case SYS8D: ifm = 1; miftyp = 3; break;
 549         case SYS9: ifm = 1; miftyp = 4; break;
 550         case SYS12: ifm = 1; miftyp = 5; break;
 551         case SYS16A: ifm = 1; miftyp = 7; break;
 552         case SYS16B: ifm = 1; miftyp = 8; break;
 553         case SYS16C: ifm = 1; miftyp = 9; break;
 554         case SYS18: ifm = 1; miftyp = 10; break;
 555         case SYS24: ifm = 1; miftyp = 11; break;
 556         default: goto bad;
 557         }
 558
 559         /* SUBLCD only supports SYS interface */
 560         if (lcdc_chan_is_sublcd(ch)) {
 561                 if (ifm == 0)
 562                         goto bad;
 563                 else
 564                         ifm = 0;
 565         }
 566
 567         ch->ldmt1r_value = (ifm << 12) | miftyp;
 568         return 0;
 569  bad:
 570         return -EINVAL;
 571 }
 572
 573 static int sh_mobile_lcdc_setup_clocks(struct platform_device *pdev,
 574                                        int clock_source,
 575                                        struct sh_mobile_lcdc_priv *priv)
 576 {
 577 #ifdef CONFIG_HAVE_CLK
 578         char clk_name[8];
 579 #endif
 580         char *str;
 581         int icksel;
 582
 583         switch (clock_source) {
 584         case LCDC_CLK_BUS: str = "bus_clk"; icksel = 0; break;
 585         case LCDC_CLK_PERIPHERAL: str = "peripheral_clk"; icksel = 1; break;
 586         case LCDC_CLK_EXTERNAL: str = NULL; icksel = 2; break;
 587         default:
 588                 return -EINVAL;
 589         }
 590
 591         priv->lddckr = icksel << 16;
 592
 593 #ifdef CONFIG_HAVE_CLK
 594         atomic_set(&priv->clk_usecnt, -1);
 595         snprintf(clk_name, sizeof(clk_name), "lcdc%d", pdev->id);
 596         priv->clk = clk_get(&pdev->dev, clk_name);
 597         if (IS_ERR(priv->clk)) {
 598                 dev_err(&pdev->dev, "cannot get clock \"%s\"\n", clk_name);
 599                 return PTR_ERR(priv->clk);
 600         }
 601
 602         if (str) {
 603                 priv->dot_clk = clk_get(&pdev->dev, str);
 604                 if (IS_ERR(priv->dot_clk)) {
 605                         dev_err(&pdev->dev, "cannot get dot clock %s\n", str);
 606                         clk_put(priv->clk);
 607                         return PTR_ERR(priv->dot_clk);
 608                 }
 609         }
 610 #endif
 611
 612         return 0;
 613 }
 614
 615 static int sh_mobile_lcdc_setcolreg(u_int regno,
 616                                     u_int red, u_int green, u_int blue,
 617                                     u_int transp, struct fb_info *info)
 618 {
 619         u32 *palette = info->pseudo_palette;
 620
 621         if (regno >= PALETTE_NR)
 622                 return -EINVAL;
 623
 624         /* only FB_VISUAL_TRUECOLOR supported */
 625
 626         red >>= 16 - info->var.red.length;
 627         green >>= 16 - info->var.green.length;
 628         blue >>= 16 - info->var.blue.length;
 629         transp >>= 16 - info->var.transp.length;
 630
 631         palette[regno] = (red << info->var.red.offset) |
 632           (green << info->var.green.offset) |
 633           (blue << info->var.blue.offset) |
 634           (transp << info->var.transp.offset);
 635
 636         return 0;
 637 }
 638
 639 static struct fb_fix_screeninfo sh_mobile_lcdc_fix  = {
 640         .id =           "SH Mobile LCDC",
 641         .type =         FB_TYPE_PACKED_PIXELS,
 642         .visual =       FB_VISUAL_TRUECOLOR,
 643         .accel =        FB_ACCEL_NONE,
 644 };
 645
 646 static void sh_mobile_lcdc_fillrect(struct fb_info *info,
 647                                     const struct fb_fillrect *rect)
 648 {
 649         sys_fillrect(info, rect);
 650         sh_mobile_lcdc_deferred_io_touch(info);
 651 }
 652
 653 static void sh_mobile_lcdc_copyarea(struct fb_info *info,
 654                                     const struct fb_copyarea *area)
 655 {
 656         sys_copyarea(info, area);
 657         sh_mobile_lcdc_deferred_io_touch(info);
 658 }
 659
 660 static void sh_mobile_lcdc_imageblit(struct fb_info *info,
 661                                      const struct fb_image *image)
 662 {
 663         sys_imageblit(info, image);
 664         sh_mobile_lcdc_deferred_io_touch(info);
 665 }
 666
 667 static struct fb_ops sh_mobile_lcdc_ops = {
 668         .fb_setcolreg   = sh_mobile_lcdc_setcolreg,
 669         .fb_read        = fb_sys_read,
 670         .fb_write       = fb_sys_write,
 671         .fb_fillrect    = sh_mobile_lcdc_fillrect,
 672         .fb_copyarea    = sh_mobile_lcdc_copyarea,
 673         .fb_imageblit   = sh_mobile_lcdc_imageblit,
 674 };
 675
 676 static int sh_mobile_lcdc_set_bpp(struct fb_var_screeninfo *var, int bpp)
 677 {
 678         switch (bpp) {
 679         case 16: /* PKF[4:0] = 00011 - RGB 565 */
 680                 var->red.offset = 11;
 681                 var->red.length = 5;
 682                 var->green.offset = 5;
 683                 var->green.length = 6;
 684                 var->blue.offset = 0;
 685                 var->blue.length = 5;
 686                 var->transp.offset = 0;
 687                 var->transp.length = 0;
 688                 break;
 689
 690         case 32: /* PKF[4:0] = 00000 - RGB 888
 691                   * sh7722 pdf says 00RRGGBB but reality is GGBB00RR
 692                   * this may be because LDDDSR has word swap enabled..
 693                   */
 694                 var->red.offset = 0;
 695                 var->red.length = 8;
 696                 var->green.offset = 24;
 697                 var->green.length = 8;
 698                 var->blue.offset = 16;
 699                 var->blue.length = 8;
 700                 var->transp.offset = 0;
 701                 var->transp.length = 0;
 702                 break;
 703         default:
 704                 return -EINVAL;
 705         }
 706         var->bits_per_pixel = bpp;
 707         var->red.msb_right = 0;
 708         var->green.msb_right = 0;
 709         var->blue.msb_right = 0;
 710         var->transp.msb_right = 0;
 711         return 0;
 712 }
 713
 714 static int sh_mobile_lcdc_suspend(struct device *dev)
 715 {
 716         struct platform_device *pdev = to_platform_device(dev);
 717
 718         sh_mobile_lcdc_stop(platform_get_drvdata(pdev));
 719         return 0;
 720 }
 721
 722 static int sh_mobile_lcdc_resume(struct device *dev)
 723 {
 724         struct platform_device *pdev = to_platform_device(dev);
 725
 726         return sh_mobile_lcdc_start(platform_get_drvdata(pdev));
 727 }
 728
 729 static struct dev_pm_ops sh_mobile_lcdc_dev_pm_ops = {
 730         .suspend = sh_mobile_lcdc_suspend,
 731         .resume = sh_mobile_lcdc_resume,
 732 };
 733
 734 static int sh_mobile_lcdc_remove(struct platform_device *pdev);
 735
 736 static int __init sh_mobile_lcdc_probe(struct platform_device *pdev)
 737 {
 738         struct fb_info *info;
 739         struct sh_mobile_lcdc_priv *priv;
 740         struct sh_mobile_lcdc_info *pdata;
 741         struct sh_mobile_lcdc_chan_cfg *cfg;
 742         struct resource *res;
 743         int error;
 744         void *buf;
 745         int i, j;
 746
 747         if (!pdev->dev.platform_data) {
 748                 dev_err(&pdev->dev, "no platform data defined\n");
 749                 error = -EINVAL;
 750                 goto err0;
 751         }
 752
 753         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 754         i = platform_get_irq(pdev, 0);
 755         if (!res || i < 0) {
 756                 dev_err(&pdev->dev, "cannot get platform resources\n");
 757                 error = -ENOENT;
 758                 goto err0;
 759         }
 760
 761         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 762         if (!priv) {
 763                 dev_err(&pdev->dev, "cannot allocate device data\n");
 764                 error = -ENOMEM;
 765                 goto err0;
 766         }
 767
 768         error = request_irq(i, sh_mobile_lcdc_irq, IRQF_DISABLED,
 769                             dev_name(&pdev->dev), priv);
 770         if (error) {
 771                 dev_err(&pdev->dev, "unable to request irq\n");
 772                 goto err1;
 773         }
 774
 775         priv->irq = i;
 776         platform_set_drvdata(pdev, priv);
 777         pdata = pdev->dev.platform_data;
 778
 779         j = 0;
 780         for (i = 0; i < ARRAY_SIZE(pdata->ch); i++) {
 781                 priv->ch[j].lcdc = priv;
 782                 memcpy(&priv->ch[j].cfg, &pdata->ch[i], sizeof(pdata->ch[i]));
 783
 784                 error = sh_mobile_lcdc_check_interface(&priv->ch[i]);
 785                 if (error) {
 786                         dev_err(&pdev->dev, "unsupported interface type\n");
 787                         goto err1;
 788                 }
 789                 init_waitqueue_head(&priv->ch[i].frame_end_wait);
 790
 791                 switch (pdata->ch[i].chan) {
 792                 case LCDC_CHAN_MAINLCD:
 793                         priv->ch[j].enabled = 1 << 1;
 794                         priv->ch[j].reg_offs = lcdc_offs_mainlcd;
 795                         j++;
 796                         break;
 797                 case LCDC_CHAN_SUBLCD:
 798                         priv->ch[j].enabled = 1 << 2;
 799                         priv->ch[j].reg_offs = lcdc_offs_sublcd;
 800                         j++;
 801                         break;
 802                 }
 803         }
 804
 805         if (!j) {
 806                 dev_err(&pdev->dev, "no channels defined\n");
 807                 error = -EINVAL;
 808                 goto err1;
 809         }
 810
 811         error = sh_mobile_lcdc_setup_clocks(pdev, pdata->clock_source, priv);
 812         if (error) {
 813                 dev_err(&pdev->dev, "unable to setup clocks\n");
 814                 goto err1;
 815         }
 816
 817         priv->base = ioremap_nocache(res->start, (res->end - res->start) + 1);
 818
 819         for (i = 0; i < j; i++) {
 820                 cfg = &priv->ch[i].cfg;
 821
 822                 priv->ch[i].info = framebuffer_alloc(0, &pdev->dev);
 823                 if (!priv->ch[i].info) {
 824                         dev_err(&pdev->dev, "unable to allocate fb_info\n");
 825                         error = -ENOMEM;
 826                         break;
 827                 }
 828
 829                 info = priv->ch[i].info;
 830                 info->fbops = &sh_mobile_lcdc_ops;
 831                 info->var.xres = info->var.xres_virtual = cfg->lcd_cfg.xres;
 832                 info->var.yres = info->var.yres_virtual = cfg->lcd_cfg.yres;
 833                 info->var.width = cfg->lcd_size_cfg.width;
 834                 info->var.height = cfg->lcd_size_cfg.height;
 835                 info->var.activate = FB_ACTIVATE_NOW;
 836                 error = sh_mobile_lcdc_set_bpp(&info->var, cfg->bpp);
 837                 if (error)
 838                         break;
 839
 840                 info->fix = sh_mobile_lcdc_fix;
 841                 info->fix.line_length = cfg->lcd_cfg.xres * (cfg->bpp / 8);
 842                 info->fix.smem_len = info->fix.line_length * cfg->lcd_cfg.yres;
 843
 844                 buf = dma_alloc_coherent(&pdev->dev, info->fix.smem_len,
 845                                          &priv->ch[i].dma_handle, GFP_KERNEL);
 846                 if (!buf) {
 847                         dev_err(&pdev->dev, "unable to allocate buffer\n");
 848                         error = -ENOMEM;
 849                         break;
 850                 }
 851
 852                 info->pseudo_palette = &priv->ch[i].pseudo_palette;
 853                 info->flags = FBINFO_FLAG_DEFAULT;
 854
 855                 error = fb_alloc_cmap(&info->cmap, PALETTE_NR, 0);
 856                 if (error < 0) {
 857                         dev_err(&pdev->dev, "unable to allocate cmap\n");
 858                         dma_free_coherent(&pdev->dev, info->fix.smem_len,
 859                                           buf, priv->ch[i].dma_handle);
 860                         break;
 861                 }
 862
 863                 memset(buf, 0, info->fix.smem_len);
 864                 info->fix.smem_start = priv->ch[i].dma_handle;
 865                 info->screen_base = buf;
 866                 info->device = &pdev->dev;
 867                 info->par = &priv->ch[i];
 868         }
 869
 870         if (error)
 871                 goto err1;
 872
 873         error = sh_mobile_lcdc_start(priv);
 874         if (error) {
 875                 dev_err(&pdev->dev, "unable to start hardware\n");
 876                 goto err1;
 877         }
 878
 879         for (i = 0; i < j; i++) {
 880                 struct sh_mobile_lcdc_chan *ch = priv->ch + i;
 881
 882                 info = ch->info;
 883
 884                 if (info->fbdefio) {
 885                         priv->ch->sglist = vmalloc(sizeof(struct scatterlist) *
 886                                         info->fix.smem_len >> PAGE_SHIFT);
 887                         if (!priv->ch->sglist) {
 888                                 dev_err(&pdev->dev, "cannot allocate sglist\n");
 889                                 goto err1;
 890                         }
 891                 }
 892
 893                 error = register_framebuffer(info);
 894                 if (error < 0)
 895                         goto err1;
 896
 897                 dev_info(info->dev,
 898                          "registered %s/%s as %dx%d %dbpp.\n",
 899                          pdev->name,
 900                          (ch->cfg.chan == LCDC_CHAN_MAINLCD) ?
 901                          "mainlcd" : "sublcd",
 902                          (int) ch->cfg.lcd_cfg.xres,
 903                          (int) ch->cfg.lcd_cfg.yres,
 904                          ch->cfg.bpp);
 905
 906                 /* deferred io mode: disable clock to save power */
 907                 if (info->fbdefio)
 908                         sh_mobile_lcdc_clk_off(priv);
 909         }
 910
 911         return 0;
 912  err1:
 913         sh_mobile_lcdc_remove(pdev);
 914  err0:
 915         return error;
 916 }
 917
 918 static int sh_mobile_lcdc_remove(struct platform_device *pdev)
 919 {
 920         struct sh_mobile_lcdc_priv *priv = platform_get_drvdata(pdev);
 921         struct fb_info *info;
 922         int i;
 923
 924         for (i = 0; i < ARRAY_SIZE(priv->ch); i++)
 925                 if (priv->ch[i].info->dev)
 926                         unregister_framebuffer(priv->ch[i].info);
 927
 928         sh_mobile_lcdc_stop(priv);
 929
 930         for (i = 0; i < ARRAY_SIZE(priv->ch); i++) {
 931                 info = priv->ch[i].info;
 932
 933                 if (!info || !info->device)
 934                         continue;
 935
 936                 if (priv->ch[i].sglist)
 937                         vfree(priv->ch[i].sglist);
 938
 939                 dma_free_coherent(&pdev->dev, info->fix.smem_len,
 940                                   info->screen_base, priv->ch[i].dma_handle);
 941                 fb_dealloc_cmap(&info->cmap);
 942                 framebuffer_release(info);
 943         }
 944
 945 #ifdef CONFIG_HAVE_CLK
 946         if (priv->dot_clk)
 947                 clk_put(priv->dot_clk);
 948         clk_put(priv->clk);
 949 #endif
 950
 951         if (priv->base)
 952                 iounmap(priv->base);
 953
 954         if (priv->irq)
 955                 free_irq(priv->irq, priv);
 956         kfree(priv);
 957         return 0;
 958 }
 959
 960 static struct platform_driver sh_mobile_lcdc_driver = {
 961         .driver         = {
 962                 .name           = "sh_mobile_lcdc_fb",
 963                 .owner          = THIS_MODULE,
 964                 .pm             = &sh_mobile_lcdc_dev_pm_ops,
 965         },
 966         .probe          = sh_mobile_lcdc_probe,
 967         .remove         = sh_mobile_lcdc_remove,
 968 };
 969
 970 static int __init sh_mobile_lcdc_init(void)
 971 {
 972         return platform_driver_register(&sh_mobile_lcdc_driver);
 973 }
 974
 975 static void __exit sh_mobile_lcdc_exit(void)
 976 {
 977         platform_driver_unregister(&sh_mobile_lcdc_driver);
 978 }
 979
 980 module_init(sh_mobile_lcdc_init);
 981 module_exit(sh_mobile_lcdc_exit);
 982
 983 MODULE_DESCRIPTION("SuperH Mobile LCDC Framebuffer driver");
 984 MODULE_AUTHOR("Magnus Damm <damm@opensource.se>");
 985 MODULE_LICENSE("GPL v2");