git.oblomov.eu Git - linux-2.6/blob - drivers/video/omap/hwa742.c

   1 /*
   2  * Epson HWA742 LCD controller driver
   3  *
   4  * Copyright (C) 2004-2005 Nokia Corporation
   5  * Authors:     Juha Yrjölä   <juha.yrjola@nokia.com>
   6  *              Imre Deak     <imre.deak@nokia.com>
   7  * YUV support: Jussi Laako   <jussi.laako@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22  */
  23 #include <linux/module.h>
  24 #include <linux/mm.h>
  25 #include <linux/fb.h>
  26 #include <linux/delay.h>
  27 #include <linux/clk.h>
  28
  29 #include <mach/dma.h>
  30 #include <mach/omapfb.h>
  31 #include <mach/hwa742.h>
  32
  33 #define HWA742_REV_CODE_REG       0x0
  34 #define HWA742_CONFIG_REG         0x2
  35 #define HWA742_PLL_DIV_REG        0x4
  36 #define HWA742_PLL_0_REG          0x6
  37 #define HWA742_PLL_1_REG          0x8
  38 #define HWA742_PLL_2_REG          0xa
  39 #define HWA742_PLL_3_REG          0xc
  40 #define HWA742_PLL_4_REG          0xe
  41 #define HWA742_CLK_SRC_REG        0x12
  42 #define HWA742_PANEL_TYPE_REG     0x14
  43 #define HWA742_H_DISP_REG         0x16
  44 #define HWA742_H_NDP_REG          0x18
  45 #define HWA742_V_DISP_1_REG       0x1a
  46 #define HWA742_V_DISP_2_REG       0x1c
  47 #define HWA742_V_NDP_REG          0x1e
  48 #define HWA742_HS_W_REG           0x20
  49 #define HWA742_HP_S_REG           0x22
  50 #define HWA742_VS_W_REG           0x24
  51 #define HWA742_VP_S_REG           0x26
  52 #define HWA742_PCLK_POL_REG       0x28
  53 #define HWA742_INPUT_MODE_REG     0x2a
  54 #define HWA742_TRANSL_MODE_REG1   0x2e
  55 #define HWA742_DISP_MODE_REG      0x34
  56 #define HWA742_WINDOW_TYPE        0x36
  57 #define HWA742_WINDOW_X_START_0   0x38
  58 #define HWA742_WINDOW_X_START_1   0x3a
  59 #define HWA742_WINDOW_Y_START_0   0x3c
  60 #define HWA742_WINDOW_Y_START_1   0x3e
  61 #define HWA742_WINDOW_X_END_0     0x40
  62 #define HWA742_WINDOW_X_END_1     0x42
  63 #define HWA742_WINDOW_Y_END_0     0x44
  64 #define HWA742_WINDOW_Y_END_1     0x46
  65 #define HWA742_MEMORY_WRITE_LSB   0x48
  66 #define HWA742_MEMORY_WRITE_MSB   0x49
  67 #define HWA742_MEMORY_READ_0      0x4a
  68 #define HWA742_MEMORY_READ_1      0x4c
  69 #define HWA742_MEMORY_READ_2      0x4e
  70 #define HWA742_POWER_SAVE         0x56
  71 #define HWA742_NDP_CTRL           0x58
  72
  73 #define HWA742_AUTO_UPDATE_TIME         (HZ / 20)
  74
  75 /* Reserve 4 request slots for requests in irq context */
  76 #define REQ_POOL_SIZE                   24
  77 #define IRQ_REQ_POOL_SIZE               4
  78
  79 #define REQ_FROM_IRQ_POOL 0x01
  80
  81 #define REQ_COMPLETE    0
  82 #define REQ_PENDING     1
  83
  84 struct update_param {
  85         int     x, y, width, height;
  86         int     color_mode;
  87         int     flags;
  88 };
  89
  90 struct hwa742_request {
  91         struct list_head entry;
  92         unsigned int     flags;
  93
  94         int              (*handler)(struct hwa742_request *req);
  95         void             (*complete)(void *data);
  96         void             *complete_data;
  97
  98         union {
  99                 struct update_param     update;
 100                 struct completion       *sync;
 101         } par;
 102 };
 103
 104 struct {
 105         enum omapfb_update_mode update_mode;
 106         enum omapfb_update_mode update_mode_before_suspend;
 107
 108         struct timer_list       auto_update_timer;
 109         int                     stop_auto_update;
 110         struct omapfb_update_window     auto_update_window;
 111         unsigned                te_connected:1;
 112         unsigned                vsync_only:1;
 113
 114         struct hwa742_request   req_pool[REQ_POOL_SIZE];
 115         struct list_head        pending_req_list;
 116         struct list_head        free_req_list;
 117         struct semaphore        req_sema;
 118         spinlock_t              req_lock;
 119
 120         struct extif_timings    reg_timings, lut_timings;
 121
 122         int                     prev_color_mode;
 123         int                     prev_flags;
 124         int                     window_type;
 125
 126         u32                     max_transmit_size;
 127         u32                     extif_clk_period;
 128         unsigned long           pix_tx_time;
 129         unsigned long           line_upd_time;
 130
 131
 132         struct omapfb_device    *fbdev;
 133         struct lcd_ctrl_extif   *extif;
 134         struct lcd_ctrl         *int_ctrl;
 135
 136         void                    (*power_up)(struct device *dev);
 137         void                    (*power_down)(struct device *dev);
 138 } hwa742;
 139
 140 struct lcd_ctrl hwa742_ctrl;
 141
 142 static u8 hwa742_read_reg(u8 reg)
 143 {
 144         u8 data;
 145
 146         hwa742.extif->set_bits_per_cycle(8);
 147         hwa742.extif->write_command(&reg, 1);
 148         hwa742.extif->read_data(&data, 1);
 149
 150         return data;
 151 }
 152
 153 static void hwa742_write_reg(u8 reg, u8 data)
 154 {
 155         hwa742.extif->set_bits_per_cycle(8);
 156         hwa742.extif->write_command(&reg, 1);
 157         hwa742.extif->write_data(&data, 1);
 158 }
 159
 160 static void set_window_regs(int x_start, int y_start, int x_end, int y_end)
 161 {
 162         u8 tmp[8];
 163         u8 cmd;
 164
 165         x_end--;
 166         y_end--;
 167         tmp[0] = x_start;
 168         tmp[1] = x_start >> 8;
 169         tmp[2] = y_start;
 170         tmp[3] = y_start >> 8;
 171         tmp[4] = x_end;
 172         tmp[5] = x_end >> 8;
 173         tmp[6] = y_end;
 174         tmp[7] = y_end >> 8;
 175
 176         hwa742.extif->set_bits_per_cycle(8);
 177         cmd = HWA742_WINDOW_X_START_0;
 178
 179         hwa742.extif->write_command(&cmd, 1);
 180
 181         hwa742.extif->write_data(tmp, 8);
 182 }
 183
 184 static void set_format_regs(int conv, int transl, int flags)
 185 {
 186         if (flags & OMAPFB_FORMAT_FLAG_DOUBLE) {
 187                 hwa742.window_type = ((hwa742.window_type & 0xfc) | 0x01);
 188 #ifdef VERBOSE
 189                 dev_dbg(hwa742.fbdev->dev, "hwa742: enabled pixel doubling\n");
 190 #endif
 191         } else {
 192                 hwa742.window_type = (hwa742.window_type & 0xfc);
 193 #ifdef VERBOSE
 194                 dev_dbg(hwa742.fbdev->dev, "hwa742: disabled pixel doubling\n");
 195 #endif
 196         }
 197
 198         hwa742_write_reg(HWA742_INPUT_MODE_REG, conv);
 199         hwa742_write_reg(HWA742_TRANSL_MODE_REG1, transl);
 200         hwa742_write_reg(HWA742_WINDOW_TYPE, hwa742.window_type);
 201 }
 202
 203 static void enable_tearsync(int y, int width, int height, int screen_height,
 204                             int force_vsync)
 205 {
 206         u8 b;
 207
 208         b = hwa742_read_reg(HWA742_NDP_CTRL);
 209         b |= 1 << 2;
 210         hwa742_write_reg(HWA742_NDP_CTRL, b);
 211
 212         if (likely(hwa742.vsync_only || force_vsync)) {
 213                 hwa742.extif->enable_tearsync(1, 0);
 214                 return;
 215         }
 216
 217         if (width * hwa742.pix_tx_time < hwa742.line_upd_time) {
 218                 hwa742.extif->enable_tearsync(1, 0);
 219                 return;
 220         }
 221
 222         if ((width * hwa742.pix_tx_time / 1000) * height <
 223             (y + height) * (hwa742.line_upd_time / 1000)) {
 224                 hwa742.extif->enable_tearsync(1, 0);
 225                 return;
 226         }
 227
 228         hwa742.extif->enable_tearsync(1, y + 1);
 229 }
 230
 231 static void disable_tearsync(void)
 232 {
 233         u8 b;
 234
 235         hwa742.extif->enable_tearsync(0, 0);
 236
 237         b = hwa742_read_reg(HWA742_NDP_CTRL);
 238         b &= ~(1 << 2);
 239         hwa742_write_reg(HWA742_NDP_CTRL, b);
 240 }
 241
 242 static inline struct hwa742_request *alloc_req(void)
 243 {
 244         unsigned long flags;
 245         struct hwa742_request *req;
 246         int req_flags = 0;
 247
 248         if (!in_interrupt())
 249                 down(&hwa742.req_sema);
 250         else
 251                 req_flags = REQ_FROM_IRQ_POOL;
 252
 253         spin_lock_irqsave(&hwa742.req_lock, flags);
 254         BUG_ON(list_empty(&hwa742.free_req_list));
 255         req = list_entry(hwa742.free_req_list.next,
 256                          struct hwa742_request, entry);
 257         list_del(&req->entry);
 258         spin_unlock_irqrestore(&hwa742.req_lock, flags);
 259
 260         INIT_LIST_HEAD(&req->entry);
 261         req->flags = req_flags;
 262
 263         return req;
 264 }
 265
 266 static inline void free_req(struct hwa742_request *req)
 267 {
 268         unsigned long flags;
 269
 270         spin_lock_irqsave(&hwa742.req_lock, flags);
 271
 272         list_del(&req->entry);
 273         list_add(&req->entry, &hwa742.free_req_list);
 274         if (!(req->flags & REQ_FROM_IRQ_POOL))
 275                 up(&hwa742.req_sema);
 276
 277         spin_unlock_irqrestore(&hwa742.req_lock, flags);
 278 }
 279
 280 static void process_pending_requests(void)
 281 {
 282         unsigned long flags;
 283
 284         spin_lock_irqsave(&hwa742.req_lock, flags);
 285
 286         while (!list_empty(&hwa742.pending_req_list)) {
 287                 struct hwa742_request *req;
 288                 void (*complete)(void *);
 289                 void *complete_data;
 290
 291                 req = list_entry(hwa742.pending_req_list.next,
 292                                  struct hwa742_request, entry);
 293                 spin_unlock_irqrestore(&hwa742.req_lock, flags);
 294
 295                 if (req->handler(req) == REQ_PENDING)
 296                         return;
 297
 298                 complete = req->complete;
 299                 complete_data = req->complete_data;
 300                 free_req(req);
 301
 302                 if (complete)
 303                         complete(complete_data);
 304
 305                 spin_lock_irqsave(&hwa742.req_lock, flags);
 306         }
 307
 308         spin_unlock_irqrestore(&hwa742.req_lock, flags);
 309 }
 310
 311 static void submit_req_list(struct list_head *head)
 312 {
 313         unsigned long flags;
 314         int process = 1;
 315
 316         spin_lock_irqsave(&hwa742.req_lock, flags);
 317         if (likely(!list_empty(&hwa742.pending_req_list)))
 318                 process = 0;
 319         list_splice_init(head, hwa742.pending_req_list.prev);
 320         spin_unlock_irqrestore(&hwa742.req_lock, flags);
 321
 322         if (process)
 323                 process_pending_requests();
 324 }
 325
 326 static void request_complete(void *data)
 327 {
 328         struct hwa742_request   *req = (struct hwa742_request *)data;
 329         void                    (*complete)(void *);
 330         void                    *complete_data;
 331
 332         complete = req->complete;
 333         complete_data = req->complete_data;
 334
 335         free_req(req);
 336
 337         if (complete)
 338                 complete(complete_data);
 339
 340         process_pending_requests();
 341 }
 342
 343 static int send_frame_handler(struct hwa742_request *req)
 344 {
 345         struct update_param *par = &req->par.update;
 346         int x = par->x;
 347         int y = par->y;
 348         int w = par->width;
 349         int h = par->height;
 350         int bpp;
 351         int conv, transl;
 352         unsigned long offset;
 353         int color_mode = par->color_mode;
 354         int flags = par->flags;
 355         int scr_width = hwa742.fbdev->panel->x_res;
 356         int scr_height = hwa742.fbdev->panel->y_res;
 357
 358 #ifdef VERBOSE
 359         dev_dbg(hwa742.fbdev->dev, "x %d y %d w %d h %d scr_width %d "
 360                 "color_mode %d flags %d\n",
 361                 x, y, w, h, scr_width, color_mode, flags);
 362 #endif
 363
 364         switch (color_mode) {
 365         case OMAPFB_COLOR_YUV422:
 366                 bpp = 16;
 367                 conv = 0x08;
 368                 transl = 0x25;
 369                 break;
 370         case OMAPFB_COLOR_YUV420:
 371                 bpp = 12;
 372                 conv = 0x09;
 373                 transl = 0x25;
 374                 break;
 375         case OMAPFB_COLOR_RGB565:
 376                 bpp = 16;
 377                 conv = 0x01;
 378                 transl = 0x05;
 379                 break;
 380         default:
 381                 return -EINVAL;
 382         }
 383
 384         if (hwa742.prev_flags != flags ||
 385             hwa742.prev_color_mode != color_mode) {
 386                 set_format_regs(conv, transl, flags);
 387                 hwa742.prev_color_mode = color_mode;
 388                 hwa742.prev_flags = flags;
 389         }
 390         flags = req->par.update.flags;
 391         if (flags & OMAPFB_FORMAT_FLAG_TEARSYNC)
 392                 enable_tearsync(y, scr_width, h, scr_height,
 393                                 flags & OMAPFB_FORMAT_FLAG_FORCE_VSYNC);
 394         else
 395                 disable_tearsync();
 396
 397         set_window_regs(x, y, x + w, y + h);
 398
 399         offset = (scr_width * y + x) * bpp / 8;
 400
 401         hwa742.int_ctrl->setup_plane(OMAPFB_PLANE_GFX,
 402                         OMAPFB_CHANNEL_OUT_LCD, offset, scr_width, 0, 0, w, h,
 403                         color_mode);
 404
 405         hwa742.extif->set_bits_per_cycle(16);
 406
 407         hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 1);
 408         hwa742.extif->transfer_area(w, h, request_complete, req);
 409
 410         return REQ_PENDING;
 411 }
 412
 413 static void send_frame_complete(void *data)
 414 {
 415         hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 0);
 416 }
 417
 418 #define ADD_PREQ(_x, _y, _w, _h) do {           \
 419         req = alloc_req();                      \
 420         req->handler    = send_frame_handler;   \
 421         req->complete   = send_frame_complete;  \
 422         req->par.update.x = _x;                 \
 423         req->par.update.y = _y;                 \
 424         req->par.update.width  = _w;            \
 425         req->par.update.height = _h;            \
 426         req->par.update.color_mode = color_mode;\
 427         req->par.update.flags     = flags;      \
 428         list_add_tail(&req->entry, req_head);   \
 429 } while(0)
 430
 431 static void create_req_list(struct omapfb_update_window *win,
 432                             struct list_head *req_head)
 433 {
 434         struct hwa742_request *req;
 435         int x = win->x;
 436         int y = win->y;
 437         int width = win->width;
 438         int height = win->height;
 439         int color_mode;
 440         int flags;
 441
 442         flags = win->format & ~OMAPFB_FORMAT_MASK;
 443         color_mode = win->format & OMAPFB_FORMAT_MASK;
 444
 445         if (x & 1) {
 446                 ADD_PREQ(x, y, 1, height);
 447                 width--;
 448                 x++;
 449                 flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
 450         }
 451         if (width & ~1) {
 452                 unsigned int xspan = width & ~1;
 453                 unsigned int ystart = y;
 454                 unsigned int yspan = height;
 455
 456                 if (xspan * height * 2 > hwa742.max_transmit_size) {
 457                         yspan = hwa742.max_transmit_size / (xspan * 2);
 458                         ADD_PREQ(x, ystart, xspan, yspan);
 459                         ystart += yspan;
 460                         yspan = height - yspan;
 461                         flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
 462                 }
 463
 464                 ADD_PREQ(x, ystart, xspan, yspan);
 465                 x += xspan;
 466                 width -= xspan;
 467                 flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
 468         }
 469         if (width)
 470                 ADD_PREQ(x, y, 1, height);
 471 }
 472
 473 static void auto_update_complete(void *data)
 474 {
 475         if (!hwa742.stop_auto_update)
 476                 mod_timer(&hwa742.auto_update_timer,
 477                           jiffies + HWA742_AUTO_UPDATE_TIME);
 478 }
 479
 480 static void hwa742_update_window_auto(unsigned long arg)
 481 {
 482         LIST_HEAD(req_list);
 483         struct hwa742_request *last;
 484
 485         create_req_list(&hwa742.auto_update_window, &req_list);
 486         last = list_entry(req_list.prev, struct hwa742_request, entry);
 487
 488         last->complete = auto_update_complete;
 489         last->complete_data = NULL;
 490
 491         submit_req_list(&req_list);
 492 }
 493
 494 int hwa742_update_window_async(struct fb_info *fbi,
 495                                  struct omapfb_update_window *win,
 496                                  void (*complete_callback)(void *arg),
 497                                  void *complete_callback_data)
 498 {
 499         LIST_HEAD(req_list);
 500         struct hwa742_request *last;
 501         int r = 0;
 502
 503         if (hwa742.update_mode != OMAPFB_MANUAL_UPDATE) {
 504                 dev_dbg(hwa742.fbdev->dev, "invalid update mode\n");
 505                 r = -EINVAL;
 506                 goto out;
 507         }
 508         if (unlikely(win->format &
 509             ~(0x03 | OMAPFB_FORMAT_FLAG_DOUBLE |
 510             OMAPFB_FORMAT_FLAG_TEARSYNC | OMAPFB_FORMAT_FLAG_FORCE_VSYNC))) {
 511                 dev_dbg(hwa742.fbdev->dev, "invalid window flag\n");
 512                 r = -EINVAL;
 513                 goto out;
 514         }
 515
 516         create_req_list(win, &req_list);
 517         last = list_entry(req_list.prev, struct hwa742_request, entry);
 518
 519         last->complete = complete_callback;
 520         last->complete_data = (void *)complete_callback_data;
 521
 522         submit_req_list(&req_list);
 523
 524 out:
 525         return r;
 526 }
 527 EXPORT_SYMBOL(hwa742_update_window_async);
 528
 529 static int hwa742_setup_plane(int plane, int channel_out,
 530                                   unsigned long offset, int screen_width,
 531                                   int pos_x, int pos_y, int width, int height,
 532                                   int color_mode)
 533 {
 534         if (plane != OMAPFB_PLANE_GFX ||
 535             channel_out != OMAPFB_CHANNEL_OUT_LCD)
 536                 return -EINVAL;
 537
 538         return 0;
 539 }
 540
 541 static int hwa742_enable_plane(int plane, int enable)
 542 {
 543         if (plane != 0)
 544                 return -EINVAL;
 545
 546         hwa742.int_ctrl->enable_plane(plane, enable);
 547
 548         return 0;
 549 }
 550
 551 static int sync_handler(struct hwa742_request *req)
 552 {
 553         complete(req->par.sync);
 554         return REQ_COMPLETE;
 555 }
 556
 557 static void hwa742_sync(void)
 558 {
 559         LIST_HEAD(req_list);
 560         struct hwa742_request *req;
 561         struct completion comp;
 562
 563         req = alloc_req();
 564
 565         req->handler = sync_handler;
 566         req->complete = NULL;
 567         init_completion(&comp);
 568         req->par.sync = &comp;
 569
 570         list_add(&req->entry, &req_list);
 571         submit_req_list(&req_list);
 572
 573         wait_for_completion(&comp);
 574 }
 575
 576 static void hwa742_bind_client(struct omapfb_notifier_block *nb)
 577 {
 578         dev_dbg(hwa742.fbdev->dev, "update_mode %d\n", hwa742.update_mode);
 579         if (hwa742.update_mode == OMAPFB_MANUAL_UPDATE) {
 580                 omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_READY);
 581         }
 582 }
 583
 584 static int hwa742_set_update_mode(enum omapfb_update_mode mode)
 585 {
 586         if (mode != OMAPFB_MANUAL_UPDATE && mode != OMAPFB_AUTO_UPDATE &&
 587             mode != OMAPFB_UPDATE_DISABLED)
 588                 return -EINVAL;
 589
 590         if (mode == hwa742.update_mode)
 591                 return 0;
 592
 593         dev_info(hwa742.fbdev->dev, "HWA742: setting update mode to %s\n",
 594                         mode == OMAPFB_UPDATE_DISABLED ? "disabled" :
 595                         (mode == OMAPFB_AUTO_UPDATE ? "auto" : "manual"));
 596
 597         switch (hwa742.update_mode) {
 598         case OMAPFB_MANUAL_UPDATE:
 599                 omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_DISABLED);
 600                 break;
 601         case OMAPFB_AUTO_UPDATE:
 602                 hwa742.stop_auto_update = 1;
 603                 del_timer_sync(&hwa742.auto_update_timer);
 604                 break;
 605         case OMAPFB_UPDATE_DISABLED:
 606                 break;
 607         }
 608
 609         hwa742.update_mode = mode;
 610         hwa742_sync();
 611         hwa742.stop_auto_update = 0;
 612
 613         switch (mode) {
 614         case OMAPFB_MANUAL_UPDATE:
 615                 omapfb_notify_clients(hwa742.fbdev, OMAPFB_EVENT_READY);
 616                 break;
 617         case OMAPFB_AUTO_UPDATE:
 618                 hwa742_update_window_auto(0);
 619                 break;
 620         case OMAPFB_UPDATE_DISABLED:
 621                 break;
 622         }
 623
 624         return 0;
 625 }
 626
 627 static enum omapfb_update_mode hwa742_get_update_mode(void)
 628 {
 629         return hwa742.update_mode;
 630 }
 631
 632 static unsigned long round_to_extif_ticks(unsigned long ps, int div)
 633 {
 634         int bus_tick = hwa742.extif_clk_period * div;
 635         return (ps + bus_tick - 1) / bus_tick * bus_tick;
 636 }
 637
 638 static int calc_reg_timing(unsigned long sysclk, int div)
 639 {
 640         struct extif_timings *t;
 641         unsigned long systim;
 642
 643         /* CSOnTime 0, WEOnTime 2 ns, REOnTime 2 ns,
 644          * AccessTime 2 ns + 12.2 ns (regs),
 645          * WEOffTime = WEOnTime + 1 ns,
 646          * REOffTime = REOnTime + 16 ns (regs),
 647          * CSOffTime = REOffTime + 1 ns
 648          * ReadCycle = 2ns + 2*SYSCLK  (regs),
 649          * WriteCycle = 2*SYSCLK + 2 ns,
 650          * CSPulseWidth = 10 ns */
 651         systim = 1000000000 / (sysclk / 1000);
 652         dev_dbg(hwa742.fbdev->dev, "HWA742 systim %lu ps extif_clk_period %u ps"
 653                   "extif_clk_div %d\n", systim, hwa742.extif_clk_period, div);
 654
 655         t = &hwa742.reg_timings;
 656         memset(t, 0, sizeof(*t));
 657         t->clk_div = div;
 658         t->cs_on_time = 0;
 659         t->we_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
 660         t->re_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
 661         t->access_time = round_to_extif_ticks(t->re_on_time + 12200, div);
 662         t->we_off_time = round_to_extif_ticks(t->we_on_time + 1000, div);
 663         t->re_off_time = round_to_extif_ticks(t->re_on_time + 16000, div);
 664         t->cs_off_time = round_to_extif_ticks(t->re_off_time + 1000, div);
 665         t->we_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
 666         if (t->we_cycle_time < t->we_off_time)
 667                 t->we_cycle_time = t->we_off_time;
 668         t->re_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
 669         if (t->re_cycle_time < t->re_off_time)
 670                 t->re_cycle_time = t->re_off_time;
 671         t->cs_pulse_width = 0;
 672
 673         dev_dbg(hwa742.fbdev->dev, "[reg]cson %d csoff %d reon %d reoff %d\n",
 674                  t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
 675         dev_dbg(hwa742.fbdev->dev, "[reg]weon %d weoff %d recyc %d wecyc %d\n",
 676                  t->we_on_time, t->we_off_time, t->re_cycle_time,
 677                  t->we_cycle_time);
 678         dev_dbg(hwa742.fbdev->dev, "[reg]rdaccess %d cspulse %d\n",
 679                  t->access_time, t->cs_pulse_width);
 680
 681         return hwa742.extif->convert_timings(t);
 682 }
 683
 684 static int calc_lut_timing(unsigned long sysclk, int div)
 685 {
 686         struct extif_timings *t;
 687         unsigned long systim;
 688
 689         /* CSOnTime 0, WEOnTime 2 ns, REOnTime 2 ns,
 690          * AccessTime 2 ns + 4 * SYSCLK + 26 (lut),
 691          * WEOffTime = WEOnTime + 1 ns,
 692          * REOffTime = REOnTime + 4*SYSCLK + 26 ns (lut),
 693          * CSOffTime = REOffTime + 1 ns
 694          * ReadCycle = 2ns + 4*SYSCLK + 26 ns (lut),
 695          * WriteCycle = 2*SYSCLK + 2 ns,
 696          * CSPulseWidth = 10 ns
 697          */
 698         systim = 1000000000 / (sysclk / 1000);
 699         dev_dbg(hwa742.fbdev->dev, "HWA742 systim %lu ps extif_clk_period %u ps"
 700                   "extif_clk_div %d\n", systim, hwa742.extif_clk_period, div);
 701
 702         t = &hwa742.lut_timings;
 703         memset(t, 0, sizeof(*t));
 704
 705         t->clk_div = div;
 706
 707         t->cs_on_time = 0;
 708         t->we_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
 709         t->re_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
 710         t->access_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
 711                                               26000, div);
 712         t->we_off_time = round_to_extif_ticks(t->we_on_time + 1000, div);
 713         t->re_off_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
 714                                               26000, div);
 715         t->cs_off_time = round_to_extif_ticks(t->re_off_time + 1000, div);
 716         t->we_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
 717         if (t->we_cycle_time < t->we_off_time)
 718                 t->we_cycle_time = t->we_off_time;
 719         t->re_cycle_time = round_to_extif_ticks(2000 + 4 * systim + 26000, div);
 720         if (t->re_cycle_time < t->re_off_time)
 721                 t->re_cycle_time = t->re_off_time;
 722         t->cs_pulse_width = 0;
 723
 724         dev_dbg(hwa742.fbdev->dev, "[lut]cson %d csoff %d reon %d reoff %d\n",
 725                  t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
 726         dev_dbg(hwa742.fbdev->dev, "[lut]weon %d weoff %d recyc %d wecyc %d\n",
 727                  t->we_on_time, t->we_off_time, t->re_cycle_time,
 728                  t->we_cycle_time);
 729         dev_dbg(hwa742.fbdev->dev, "[lut]rdaccess %d cspulse %d\n",
 730                  t->access_time, t->cs_pulse_width);
 731
 732         return hwa742.extif->convert_timings(t);
 733 }
 734
 735 static int calc_extif_timings(unsigned long sysclk, int *extif_mem_div)
 736 {
 737         int max_clk_div;
 738         int div;
 739
 740         hwa742.extif->get_clk_info(&hwa742.extif_clk_period, &max_clk_div);
 741         for (div = 1; div < max_clk_div; div++) {
 742                 if (calc_reg_timing(sysclk, div) == 0)
 743                         break;
 744         }
 745         if (div > max_clk_div)
 746                 goto err;
 747
 748         *extif_mem_div = div;
 749
 750         for (div = 1; div < max_clk_div; div++) {
 751                 if (calc_lut_timing(sysclk, div) == 0)
 752                         break;
 753         }
 754
 755         if (div > max_clk_div)
 756                 goto err;
 757
 758         return 0;
 759
 760 err:
 761         dev_err(hwa742.fbdev->dev, "can't setup timings\n");
 762         return -1;
 763 }
 764
 765 static void calc_hwa742_clk_rates(unsigned long ext_clk,
 766                                 unsigned long *sys_clk, unsigned long *pix_clk)
 767 {
 768         int pix_clk_src;
 769         int sys_div = 0, sys_mul = 0;
 770         int pix_div;
 771
 772         pix_clk_src = hwa742_read_reg(HWA742_CLK_SRC_REG);
 773         pix_div = ((pix_clk_src >> 3) & 0x1f) + 1;
 774         if ((pix_clk_src & (0x3 << 1)) == 0) {
 775                 /* Source is the PLL */
 776                 sys_div = (hwa742_read_reg(HWA742_PLL_DIV_REG) & 0x3f) + 1;
 777                 sys_mul = (hwa742_read_reg(HWA742_PLL_4_REG) & 0x7f) + 1;
 778                 *sys_clk = ext_clk * sys_mul / sys_div;
 779         } else  /* else source is ext clk, or oscillator */
 780                 *sys_clk = ext_clk;
 781
 782         *pix_clk = *sys_clk / pix_div;                  /* HZ */
 783         dev_dbg(hwa742.fbdev->dev,
 784                 "ext_clk %ld pix_src %d pix_div %d sys_div %d sys_mul %d\n",
 785                 ext_clk, pix_clk_src & (0x3 << 1), pix_div, sys_div, sys_mul);
 786         dev_dbg(hwa742.fbdev->dev, "sys_clk %ld pix_clk %ld\n",
 787                 *sys_clk, *pix_clk);
 788 }
 789
 790
 791 static int setup_tearsync(unsigned long pix_clk, int extif_div)
 792 {
 793         int hdisp, vdisp;
 794         int hndp, vndp;
 795         int hsw, vsw;
 796         int hs, vs;
 797         int hs_pol_inv, vs_pol_inv;
 798         int use_hsvs, use_ndp;
 799         u8  b;
 800
 801         hsw = hwa742_read_reg(HWA742_HS_W_REG);
 802         vsw = hwa742_read_reg(HWA742_VS_W_REG);
 803         hs_pol_inv = !(hsw & 0x80);
 804         vs_pol_inv = !(vsw & 0x80);
 805         hsw = hsw & 0x7f;
 806         vsw = vsw & 0x3f;
 807
 808         hdisp = (hwa742_read_reg(HWA742_H_DISP_REG) & 0x7f) * 8;
 809         vdisp = hwa742_read_reg(HWA742_V_DISP_1_REG) +
 810                 ((hwa742_read_reg(HWA742_V_DISP_2_REG) & 0x3) << 8);
 811
 812         hndp = hwa742_read_reg(HWA742_H_NDP_REG) & 0x7f;
 813         vndp = hwa742_read_reg(HWA742_V_NDP_REG);
 814
 815         /* time to transfer one pixel (16bpp) in ps */
 816         hwa742.pix_tx_time = hwa742.reg_timings.we_cycle_time;
 817         if (hwa742.extif->get_max_tx_rate != NULL) {
 818                 /*
 819                  * The external interface might have a rate limitation,
 820                  * if so, we have to maximize our transfer rate.
 821                  */
 822                 unsigned long min_tx_time;
 823                 unsigned long max_tx_rate = hwa742.extif->get_max_tx_rate();
 824
 825                 dev_dbg(hwa742.fbdev->dev, "max_tx_rate %ld HZ\n",
 826                         max_tx_rate);
 827                 min_tx_time = 1000000000 / (max_tx_rate / 1000);  /* ps */
 828                 if (hwa742.pix_tx_time < min_tx_time)
 829                         hwa742.pix_tx_time = min_tx_time;
 830         }
 831
 832         /* time to update one line in ps */
 833         hwa742.line_upd_time = (hdisp + hndp) * 1000000 / (pix_clk / 1000);
 834         hwa742.line_upd_time *= 1000;
 835         if (hdisp * hwa742.pix_tx_time > hwa742.line_upd_time)
 836                 /*
 837                  * transfer speed too low, we might have to use both
 838                  * HS and VS
 839                  */
 840                 use_hsvs = 1;
 841         else
 842                 /* decent transfer speed, we'll always use only VS */
 843                 use_hsvs = 0;
 844
 845         if (use_hsvs && (hs_pol_inv || vs_pol_inv)) {
 846                 /*
 847                  * HS or'ed with VS doesn't work, use the active high
 848                  * TE signal based on HNDP / VNDP
 849                  */
 850                 use_ndp = 1;
 851                 hs_pol_inv = 0;
 852                 vs_pol_inv = 0;
 853                 hs = hndp;
 854                 vs = vndp;
 855         } else {
 856                 /*
 857                  * Use HS or'ed with VS as a TE signal if both are needed
 858                  * or VNDP if only vsync is needed.
 859                  */
 860                 use_ndp = 0;
 861                 hs = hsw;
 862                 vs = vsw;
 863                 if (!use_hsvs) {
 864                         hs_pol_inv = 0;
 865                         vs_pol_inv = 0;
 866                 }
 867         }
 868
 869         hs = hs * 1000000 / (pix_clk / 1000);                   /* ps */
 870         hs *= 1000;
 871
 872         vs = vs * (hdisp + hndp) * 1000000 / (pix_clk / 1000);  /* ps */
 873         vs *= 1000;
 874
 875         if (vs <= hs)
 876                 return -EDOM;
 877         /* set VS to 120% of HS to minimize VS detection time */
 878         vs = hs * 12 / 10;
 879         /* minimize HS too */
 880         hs = 10000;
 881
 882         b = hwa742_read_reg(HWA742_NDP_CTRL);
 883         b &= ~0x3;
 884         b |= use_hsvs ? 1 : 0;
 885         b |= (use_ndp && use_hsvs) ? 0 : 2;
 886         hwa742_write_reg(HWA742_NDP_CTRL, b);
 887
 888         hwa742.vsync_only = !use_hsvs;
 889
 890         dev_dbg(hwa742.fbdev->dev,
 891                 "pix_clk %ld HZ pix_tx_time %ld ps line_upd_time %ld ps\n",
 892                 pix_clk, hwa742.pix_tx_time, hwa742.line_upd_time);
 893         dev_dbg(hwa742.fbdev->dev,
 894                 "hs %d ps vs %d ps mode %d vsync_only %d\n",
 895                 hs, vs, (b & 0x3), !use_hsvs);
 896
 897         return hwa742.extif->setup_tearsync(1, hs, vs,
 898                                             hs_pol_inv, vs_pol_inv, extif_div);
 899 }
 900
 901 static void hwa742_get_caps(int plane, struct omapfb_caps *caps)
 902 {
 903         hwa742.int_ctrl->get_caps(plane, caps);
 904         caps->ctrl |= OMAPFB_CAPS_MANUAL_UPDATE |
 905                       OMAPFB_CAPS_WINDOW_PIXEL_DOUBLE;
 906         if (hwa742.te_connected)
 907                 caps->ctrl |= OMAPFB_CAPS_TEARSYNC;
 908         caps->wnd_color |= (1 << OMAPFB_COLOR_RGB565) |
 909                            (1 << OMAPFB_COLOR_YUV420);
 910 }
 911
 912 static void hwa742_suspend(void)
 913 {
 914         hwa742.update_mode_before_suspend = hwa742.update_mode;
 915         hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
 916         /* Enable sleep mode */
 917         hwa742_write_reg(HWA742_POWER_SAVE, 1 << 1);
 918         if (hwa742.power_down != NULL)
 919                 hwa742.power_down(hwa742.fbdev->dev);
 920 }
 921
 922 static void hwa742_resume(void)
 923 {
 924         if (hwa742.power_up != NULL)
 925                 hwa742.power_up(hwa742.fbdev->dev);
 926         /* Disable sleep mode */
 927         hwa742_write_reg(HWA742_POWER_SAVE, 0);
 928         while (1) {
 929                 /* Loop until PLL output is stabilized */
 930                 if (hwa742_read_reg(HWA742_PLL_DIV_REG) & (1 << 7))
 931                         break;
 932                 set_current_state(TASK_UNINTERRUPTIBLE);
 933                 schedule_timeout(msecs_to_jiffies(5));
 934         }
 935         hwa742_set_update_mode(hwa742.update_mode_before_suspend);
 936 }
 937
 938 static int hwa742_init(struct omapfb_device *fbdev, int ext_mode,
 939                        struct omapfb_mem_desc *req_vram)
 940 {
 941         int r = 0, i;
 942         u8 rev, conf;
 943         unsigned long ext_clk;
 944         unsigned long sys_clk, pix_clk;
 945         int extif_mem_div;
 946         struct omapfb_platform_data *omapfb_conf;
 947         struct hwa742_platform_data *ctrl_conf;
 948
 949         BUG_ON(!fbdev->ext_if || !fbdev->int_ctrl);
 950
 951         hwa742.fbdev = fbdev;
 952         hwa742.extif = fbdev->ext_if;
 953         hwa742.int_ctrl = fbdev->int_ctrl;
 954
 955         omapfb_conf = fbdev->dev->platform_data;
 956         ctrl_conf = omapfb_conf->ctrl_platform_data;
 957
 958         if (ctrl_conf == NULL || ctrl_conf->get_clock_rate == NULL) {
 959                 dev_err(fbdev->dev, "HWA742: missing platform data\n");
 960                 r = -ENOENT;
 961                 goto err1;
 962         }
 963
 964         hwa742.power_down = ctrl_conf->power_down;
 965         hwa742.power_up = ctrl_conf->power_up;
 966
 967         spin_lock_init(&hwa742.req_lock);
 968
 969         if ((r = hwa742.int_ctrl->init(fbdev, 1, req_vram)) < 0)
 970                 goto err1;
 971
 972         if ((r = hwa742.extif->init(fbdev)) < 0)
 973                 goto err2;
 974
 975         ext_clk = ctrl_conf->get_clock_rate(fbdev->dev);
 976         if ((r = calc_extif_timings(ext_clk, &extif_mem_div)) < 0)
 977                 goto err3;
 978         hwa742.extif->set_timings(&hwa742.reg_timings);
 979         if (hwa742.power_up != NULL)
 980                 hwa742.power_up(fbdev->dev);
 981
 982         calc_hwa742_clk_rates(ext_clk, &sys_clk, &pix_clk);
 983         if ((r = calc_extif_timings(sys_clk, &extif_mem_div)) < 0)
 984                 goto err4;
 985         hwa742.extif->set_timings(&hwa742.reg_timings);
 986
 987         rev = hwa742_read_reg(HWA742_REV_CODE_REG);
 988         if ((rev & 0xfc) != 0x80) {
 989                 dev_err(fbdev->dev, "HWA742: invalid revision %02x\n", rev);
 990                 r = -ENODEV;
 991                 goto err4;
 992         }
 993
 994
 995         if (!(hwa742_read_reg(HWA742_PLL_DIV_REG) & 0x80)) {
 996                 dev_err(fbdev->dev,
 997                       "HWA742: controller not initialized by the bootloader\n");
 998                 r = -ENODEV;
 999                 goto err4;
1000         }
1001
1002         if (ctrl_conf->te_connected) {
1003                 if ((r = setup_tearsync(pix_clk, extif_mem_div)) < 0) {
1004                         dev_err(hwa742.fbdev->dev,
1005                                "HWA742: can't setup tearing synchronization\n");
1006                         goto err4;
1007                 }
1008                 hwa742.te_connected = 1;
1009         }
1010
1011         hwa742.max_transmit_size = hwa742.extif->max_transmit_size;
1012
1013         hwa742.update_mode = OMAPFB_UPDATE_DISABLED;
1014
1015         hwa742.auto_update_window.x = 0;
1016         hwa742.auto_update_window.y = 0;
1017         hwa742.auto_update_window.width = fbdev->panel->x_res;
1018         hwa742.auto_update_window.height = fbdev->panel->y_res;
1019         hwa742.auto_update_window.format = 0;
1020
1021         init_timer(&hwa742.auto_update_timer);
1022         hwa742.auto_update_timer.function = hwa742_update_window_auto;
1023         hwa742.auto_update_timer.data = 0;
1024
1025         hwa742.prev_color_mode = -1;
1026         hwa742.prev_flags = 0;
1027
1028         hwa742.fbdev = fbdev;
1029
1030         INIT_LIST_HEAD(&hwa742.free_req_list);
1031         INIT_LIST_HEAD(&hwa742.pending_req_list);
1032         for (i = 0; i < ARRAY_SIZE(hwa742.req_pool); i++)
1033                 list_add(&hwa742.req_pool[i].entry, &hwa742.free_req_list);
1034         BUG_ON(i <= IRQ_REQ_POOL_SIZE);
1035         sema_init(&hwa742.req_sema, i - IRQ_REQ_POOL_SIZE);
1036
1037         conf = hwa742_read_reg(HWA742_CONFIG_REG);
1038         dev_info(fbdev->dev, ": Epson HWA742 LCD controller rev %d "
1039                         "initialized (CNF pins %x)\n", rev & 0x03, conf & 0x07);
1040
1041         return 0;
1042 err4:
1043         if (hwa742.power_down != NULL)
1044                 hwa742.power_down(fbdev->dev);
1045 err3:
1046         hwa742.extif->cleanup();
1047 err2:
1048         hwa742.int_ctrl->cleanup();
1049 err1:
1050         return r;
1051 }
1052
1053 static void hwa742_cleanup(void)
1054 {
1055         hwa742_set_update_mode(OMAPFB_UPDATE_DISABLED);
1056         hwa742.extif->cleanup();
1057         hwa742.int_ctrl->cleanup();
1058         if (hwa742.power_down != NULL)
1059                 hwa742.power_down(hwa742.fbdev->dev);
1060 }
1061
1062 struct lcd_ctrl hwa742_ctrl = {
1063         .name                   = "hwa742",
1064         .init                   = hwa742_init,
1065         .cleanup                = hwa742_cleanup,
1066         .bind_client            = hwa742_bind_client,
1067         .get_caps               = hwa742_get_caps,
1068         .set_update_mode        = hwa742_set_update_mode,
1069         .get_update_mode        = hwa742_get_update_mode,
1070         .setup_plane            = hwa742_setup_plane,
1071         .enable_plane           = hwa742_enable_plane,
1072         .update_window          = hwa742_update_window_async,
1073         .sync                   = hwa742_sync,
1074         .suspend                = hwa742_suspend,
1075         .resume                 = hwa742_resume,
1076 };
1077