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