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