drivers/video/pnx4008/sdum.c

   1 /*
   2  * drivers/video/pnx4008/sdum.c
   3  *
   4  * Display Update Master support
   5  *
   6  * Authors: Grigory Tolstolytkin <gtolstolytkin@ru.mvista.com>
   7  *          Vitaly Wool <vitalywool@gmail.com>
   8  * Based on Philips Semiconductors's code
   9  *
  10  * Copyrght (c) 2005-2006 MontaVista Software, Inc.
  11  * Copyright (c) 2005 Philips Semiconductors
  12  * This file is licensed under the terms of the GNU General Public License
  13  * version 2. This program is licensed "as is" without any warranty of any
  14  * kind, whether express or implied.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/errno.h>
  20 #include <linux/string.h>
  21 #include <linux/mm.h>
  22 #include <linux/tty.h>
  23 #include <linux/slab.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/fb.h>
  29 #include <linux/init.h>
  30 #include <linux/dma-mapping.h>
  31 #include <linux/clk.h>
  32 #include <asm/uaccess.h>
  33 #include <mach/gpio.h>
  34
  35 #include "sdum.h"
  36 #include "fbcommon.h"
  37 #include "dum.h"
  38
  39 /* Framebuffers we have */
  40
  41 static struct pnx4008_fb_addr {
  42         int fb_type;
  43         long addr_offset;
  44         long fb_length;
  45 } fb_addr[] = {
  46         [0] = {
  47                 FB_TYPE_YUV, 0, 0xB0000
  48         },
  49         [1] = {
  50                 FB_TYPE_RGB, 0xB0000, 0x50000
  51         },
  52 };
  53
  54 static struct dum_data {
  55         u32 lcd_phys_start;
  56         u32 lcd_virt_start;
  57         u32 slave_phys_base;
  58         u32 *slave_virt_base;
  59         int fb_owning_channel[MAX_DUM_CHANNELS];
  60         struct dumchannel_uf chan_uf_store[MAX_DUM_CHANNELS];
  61 } dum_data;
  62
  63 /* Different local helper functions */
  64
  65 static u32 nof_pixels_dx(struct dum_ch_setup *ch_setup)
  66 {
  67         return (ch_setup->xmax - ch_setup->xmin + 1);
  68 }
  69
  70 static u32 nof_pixels_dy(struct dum_ch_setup *ch_setup)
  71 {
  72         return (ch_setup->ymax - ch_setup->ymin + 1);
  73 }
  74
  75 static u32 nof_pixels_dxy(struct dum_ch_setup *ch_setup)
  76 {
  77         return (nof_pixels_dx(ch_setup) * nof_pixels_dy(ch_setup));
  78 }
  79
  80 static u32 nof_bytes(struct dum_ch_setup *ch_setup)
  81 {
  82         u32 r = nof_pixels_dxy(ch_setup);
  83         switch (ch_setup->format) {
  84         case RGB888:
  85         case RGB666:
  86                 r *= 4;
  87                 break;
  88
  89         default:
  90                 r *= 2;
  91                 break;
  92         }
  93         return r;
  94 }
  95
  96 static u32 build_command(int disp_no, u32 reg, u32 val)
  97 {
  98         return ((disp_no << 26) | BIT(25) | (val << 16) | (disp_no << 10) |
  99                 (reg << 0));
 100 }
 101
 102 static u32 build_double_index(int disp_no, u32 val)
 103 {
 104         return ((disp_no << 26) | (val << 16) | (disp_no << 10) | (val << 0));
 105 }
 106
 107 static void build_disp_window(struct dum_ch_setup * ch_setup, struct disp_window * dw)
 108 {
 109         dw->ymin = ch_setup->ymin;
 110         dw->ymax = ch_setup->ymax;
 111         dw->xmin_l = ch_setup->xmin & 0xFF;
 112         dw->xmin_h = (ch_setup->xmin & BIT(8)) >> 8;
 113         dw->xmax_l = ch_setup->xmax & 0xFF;
 114         dw->xmax_h = (ch_setup->xmax & BIT(8)) >> 8;
 115 }
 116
 117 static int put_channel(struct dumchannel chan)
 118 {
 119         int i = chan.channelnr;
 120
 121         if (i < 0 || i > MAX_DUM_CHANNELS)
 122                 return -EINVAL;
 123         else {
 124                 DUM_CH_MIN(i) = chan.dum_ch_min;
 125                 DUM_CH_MAX(i) = chan.dum_ch_max;
 126                 DUM_CH_CONF(i) = chan.dum_ch_conf;
 127                 DUM_CH_CTRL(i) = chan.dum_ch_ctrl;
 128         }
 129
 130         return 0;
 131 }
 132
 133 static void clear_channel(int channr)
 134 {
 135         struct dumchannel chan;
 136
 137         chan.channelnr = channr;
 138         chan.dum_ch_min = 0;
 139         chan.dum_ch_max = 0;
 140         chan.dum_ch_conf = 0;
 141         chan.dum_ch_ctrl = 0;
 142
 143         put_channel(chan);
 144 }
 145
 146 static int put_cmd_string(struct cmdstring cmds)
 147 {
 148         u16 *cmd_str_virtaddr;
 149         u32 *cmd_ptr0_virtaddr;
 150         u32 cmd_str_physaddr;
 151
 152         int i = cmds.channelnr;
 153
 154         if (i < 0 || i > MAX_DUM_CHANNELS)
 155                 return -EINVAL;
 156         else if ((cmd_ptr0_virtaddr =
 157                   (int *)ioremap_nocache(DUM_COM_BASE,
 158                                          sizeof(int) * MAX_DUM_CHANNELS)) ==
 159                  NULL)
 160                 return -EIOREMAPFAILED;
 161         else {
 162                 cmd_str_physaddr = ioread32(&cmd_ptr0_virtaddr[cmds.channelnr]);
 163                 if ((cmd_str_virtaddr =
 164                      (u16 *) ioremap_nocache(cmd_str_physaddr,
 165                                              sizeof(cmds))) == NULL) {
 166                         iounmap(cmd_ptr0_virtaddr);
 167                         return -EIOREMAPFAILED;
 168                 } else {
 169                         int t;
 170                         for (t = 0; t < 8; t++)
 171                                 iowrite16(*((u16 *)&cmds.prestringlen + t),
 172                                           cmd_str_virtaddr + t);
 173
 174                         for (t = 0; t < cmds.prestringlen / 2; t++)
 175                                  iowrite16(*((u16 *)&cmds.precmd + t),
 176                                            cmd_str_virtaddr + t + 8);
 177
 178                         for (t = 0; t < cmds.poststringlen / 2; t++)
 179                                 iowrite16(*((u16 *)&cmds.postcmd + t),
 180                                           cmd_str_virtaddr + t + 8 +
 181                                                 cmds.prestringlen / 2);
 182
 183                         iounmap(cmd_ptr0_virtaddr);
 184                         iounmap(cmd_str_virtaddr);
 185                 }
 186         }
 187
 188         return 0;
 189 }
 190
 191 static u32 dum_ch_setup(int ch_no, struct dum_ch_setup * ch_setup)
 192 {
 193         struct cmdstring cmds_c;
 194         struct cmdstring *cmds = &cmds_c;
 195         struct disp_window dw;
 196         int standard;
 197         u32 orientation = 0;
 198         struct dumchannel chan = { 0 };
 199         int ret;
 200
 201         if ((ch_setup->xmirror) || (ch_setup->ymirror) || (ch_setup->rotate)) {
 202                 standard = 0;
 203
 204                 orientation = BIT(1);   /* always set 9-bit-bus */
 205                 if (ch_setup->xmirror)
 206                         orientation |= BIT(4);
 207                 if (ch_setup->ymirror)
 208                         orientation |= BIT(3);
 209                 if (ch_setup->rotate)
 210                         orientation |= BIT(0);
 211         } else
 212                 standard = 1;
 213
 214         cmds->channelnr = ch_no;
 215
 216         /* build command string header */
 217         if (standard) {
 218                 cmds->prestringlen = 32;
 219                 cmds->poststringlen = 0;
 220         } else {
 221                 cmds->prestringlen = 48;
 222                 cmds->poststringlen = 16;
 223         }
 224
 225         cmds->format =
 226             (u16) ((ch_setup->disp_no << 4) | (BIT(3)) | (ch_setup->format));
 227         cmds->reserved = 0x0;
 228         cmds->startaddr_low = (ch_setup->minadr & 0xFFFF);
 229         cmds->startaddr_high = (ch_setup->minadr >> 16);
 230
 231         if ((ch_setup->minadr == 0) && (ch_setup->maxadr == 0)
 232             && (ch_setup->xmin == 0)
 233             && (ch_setup->ymin == 0) && (ch_setup->xmax == 0)
 234             && (ch_setup->ymax == 0)) {
 235                 cmds->pixdatlen_low = 0;
 236                 cmds->pixdatlen_high = 0;
 237         } else {
 238                 u32 nbytes = nof_bytes(ch_setup);
 239                 cmds->pixdatlen_low = (nbytes & 0xFFFF);
 240                 cmds->pixdatlen_high = (nbytes >> 16);
 241         }
 242
 243         if (ch_setup->slave_trans)
 244                 cmds->pixdatlen_high |= BIT(15);
 245
 246         /* build pre-string */
 247         build_disp_window(ch_setup, &dw);
 248
 249         if (standard) {
 250                 cmds->precmd[0] =
 251                     build_command(ch_setup->disp_no, DISP_XMIN_L_REG, 0x99);
 252                 cmds->precmd[1] =
 253                     build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
 254                                   dw.xmin_l);
 255                 cmds->precmd[2] =
 256                     build_command(ch_setup->disp_no, DISP_XMIN_H_REG,
 257                                   dw.xmin_h);
 258                 cmds->precmd[3] =
 259                     build_command(ch_setup->disp_no, DISP_YMIN_REG, dw.ymin);
 260                 cmds->precmd[4] =
 261                     build_command(ch_setup->disp_no, DISP_XMAX_L_REG,
 262                                   dw.xmax_l);
 263                 cmds->precmd[5] =
 264                     build_command(ch_setup->disp_no, DISP_XMAX_H_REG,
 265                                   dw.xmax_h);
 266                 cmds->precmd[6] =
 267                     build_command(ch_setup->disp_no, DISP_YMAX_REG, dw.ymax);
 268                 cmds->precmd[7] =
 269                     build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
 270         } else {
 271                 if (dw.xmin_l == ch_no)
 272                         cmds->precmd[0] =
 273                             build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
 274                                           0x99);
 275                 else
 276                         cmds->precmd[0] =
 277                             build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
 278                                           ch_no);
 279
 280                 cmds->precmd[1] =
 281                     build_command(ch_setup->disp_no, DISP_XMIN_L_REG,
 282                                   dw.xmin_l);
 283                 cmds->precmd[2] =
 284                     build_command(ch_setup->disp_no, DISP_XMIN_H_REG,
 285                                   dw.xmin_h);
 286                 cmds->precmd[3] =
 287                     build_command(ch_setup->disp_no, DISP_YMIN_REG, dw.ymin);
 288                 cmds->precmd[4] =
 289                     build_command(ch_setup->disp_no, DISP_XMAX_L_REG,
 290                                   dw.xmax_l);
 291                 cmds->precmd[5] =
 292                     build_command(ch_setup->disp_no, DISP_XMAX_H_REG,
 293                                   dw.xmax_h);
 294                 cmds->precmd[6] =
 295                     build_command(ch_setup->disp_no, DISP_YMAX_REG, dw.ymax);
 296                 cmds->precmd[7] =
 297                     build_command(ch_setup->disp_no, DISP_1_REG, orientation);
 298                 cmds->precmd[8] =
 299                     build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
 300                 cmds->precmd[9] =
 301                     build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
 302                 cmds->precmd[0xA] =
 303                     build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
 304                 cmds->precmd[0xB] =
 305                     build_double_index(ch_setup->disp_no, DISP_PIXEL_REG);
 306                 cmds->postcmd[0] =
 307                     build_command(ch_setup->disp_no, DISP_1_REG, BIT(1));
 308                 cmds->postcmd[1] =
 309                     build_command(ch_setup->disp_no, DISP_DUMMY1_REG, 1);
 310                 cmds->postcmd[2] =
 311                     build_command(ch_setup->disp_no, DISP_DUMMY1_REG, 2);
 312                 cmds->postcmd[3] =
 313                     build_command(ch_setup->disp_no, DISP_DUMMY1_REG, 3);
 314         }
 315
 316         if ((ret = put_cmd_string(cmds_c)) != 0) {
 317                 return ret;
 318         }
 319
 320         chan.channelnr = cmds->channelnr;
 321         chan.dum_ch_min = ch_setup->dirtybuffer + ch_setup->minadr;
 322         chan.dum_ch_max = ch_setup->dirtybuffer + ch_setup->maxadr;
 323         chan.dum_ch_conf = 0x002;
 324         chan.dum_ch_ctrl = 0x04;
 325
 326         put_channel(chan);
 327
 328         return 0;
 329 }
 330
 331 static u32 display_open(int ch_no, int auto_update, u32 * dirty_buffer,
 332                         u32 * frame_buffer, u32 xpos, u32 ypos, u32 w, u32 h)
 333 {
 334
 335         struct dum_ch_setup k;
 336         int ret;
 337
 338         /* keep width & height within display area */
 339         if ((xpos + w) > DISP_MAX_X_SIZE)
 340                 w = DISP_MAX_X_SIZE - xpos;
 341
 342         if ((ypos + h) > DISP_MAX_Y_SIZE)
 343                 h = DISP_MAX_Y_SIZE - ypos;
 344
 345         /* assume 1 display only */
 346         k.disp_no = 0;
 347         k.xmin = xpos;
 348         k.ymin = ypos;
 349         k.xmax = xpos + (w - 1);
 350         k.ymax = ypos + (h - 1);
 351
 352         /* adjust min and max values if necessary */
 353         if (k.xmin > DISP_MAX_X_SIZE - 1)
 354                 k.xmin = DISP_MAX_X_SIZE - 1;
 355         if (k.ymin > DISP_MAX_Y_SIZE - 1)
 356                 k.ymin = DISP_MAX_Y_SIZE - 1;
 357
 358         if (k.xmax > DISP_MAX_X_SIZE - 1)
 359                 k.xmax = DISP_MAX_X_SIZE - 1;
 360         if (k.ymax > DISP_MAX_Y_SIZE - 1)
 361                 k.ymax = DISP_MAX_Y_SIZE - 1;
 362
 363         k.xmirror = 0;
 364         k.ymirror = 0;
 365         k.rotate = 0;
 366         k.minadr = (u32) frame_buffer;
 367         k.maxadr = (u32) frame_buffer + (((w - 1) << 10) | ((h << 2) - 2));
 368         k.pad = PAD_1024;
 369         k.dirtybuffer = (u32) dirty_buffer;
 370         k.format = RGB888;
 371         k.hwdirty = 0;
 372         k.slave_trans = 0;
 373
 374         ret = dum_ch_setup(ch_no, &k);
 375
 376         return ret;
 377 }
 378
 379 static void lcd_reset(void)
 380 {
 381         u32 *dum_pio_base = (u32 *)IO_ADDRESS(PNX4008_PIO_BASE);
 382
 383         udelay(1);
 384         iowrite32(BIT(19), &dum_pio_base[2]);
 385         udelay(1);
 386         iowrite32(BIT(19), &dum_pio_base[1]);
 387         udelay(1);
 388 }
 389
 390 static int dum_init(struct platform_device *pdev)
 391 {
 392         struct clk *clk;
 393
 394         /* enable DUM clock */
 395         clk = clk_get(&pdev->dev, "dum_ck");
 396         if (IS_ERR(clk)) {
 397                 printk(KERN_ERR "pnx4008_dum: Unable to access DUM clock\n");
 398                 return PTR_ERR(clk);
 399         }
 400
 401         clk_set_rate(clk, 1);
 402         clk_put(clk);
 403
 404         DUM_CTRL = V_DUM_RESET;
 405
 406         /* set priority to "round-robin". All other params to "false" */
 407         DUM_CONF = BIT(9);
 408
 409         /* Display 1 */
 410         DUM_WTCFG1 = PNX4008_DUM_WT_CFG;
 411         DUM_RTCFG1 = PNX4008_DUM_RT_CFG;
 412         DUM_TCFG = PNX4008_DUM_T_CFG;
 413
 414         return 0;
 415 }
 416
 417 static void dum_chan_init(void)
 418 {
 419         int i = 0, ch = 0;
 420         u32 *cmdptrs;
 421         u32 *cmdstrings;
 422
 423         DUM_COM_BASE =
 424                 CMDSTRING_BASEADDR + BYTES_PER_CMDSTRING * NR_OF_CMDSTRINGS;
 425
 426         if ((cmdptrs =
 427              (u32 *) ioremap_nocache(DUM_COM_BASE,
 428                                      sizeof(u32) * NR_OF_CMDSTRINGS)) == NULL)
 429                 return;
 430
 431         for (ch = 0; ch < NR_OF_CMDSTRINGS; ch++)
 432                 iowrite32(CMDSTRING_BASEADDR + BYTES_PER_CMDSTRING * ch,
 433                           cmdptrs + ch);
 434
 435         for (ch = 0; ch < MAX_DUM_CHANNELS; ch++)
 436                 clear_channel(ch);
 437
 438         /* Clear the cmdstrings */
 439         cmdstrings =
 440             (u32 *)ioremap_nocache(*cmdptrs,
 441                                    BYTES_PER_CMDSTRING * NR_OF_CMDSTRINGS);
 442
 443         if (!cmdstrings)
 444                 goto out;
 445
 446         for (i = 0; i < NR_OF_CMDSTRINGS * BYTES_PER_CMDSTRING / sizeof(u32);
 447              i++)
 448                 iowrite32(0, cmdstrings + i);
 449
 450         iounmap((u32 *)cmdstrings);
 451
 452 out:
 453         iounmap((u32 *)cmdptrs);
 454 }
 455
 456 static void lcd_init(void)
 457 {
 458         lcd_reset();
 459
 460         DUM_OUTP_FORMAT1 = 0; /* RGB666 */
 461
 462         udelay(1);
 463         iowrite32(V_LCD_STANDBY_OFF, dum_data.slave_virt_base);
 464         udelay(1);
 465         iowrite32(V_LCD_USE_9BIT_BUS, dum_data.slave_virt_base);
 466         udelay(1);
 467         iowrite32(V_LCD_SYNC_RISE_L, dum_data.slave_virt_base);
 468         udelay(1);
 469         iowrite32(V_LCD_SYNC_RISE_H, dum_data.slave_virt_base);
 470         udelay(1);
 471         iowrite32(V_LCD_SYNC_FALL_L, dum_data.slave_virt_base);
 472         udelay(1);
 473         iowrite32(V_LCD_SYNC_FALL_H, dum_data.slave_virt_base);
 474         udelay(1);
 475         iowrite32(V_LCD_SYNC_ENABLE, dum_data.slave_virt_base);
 476         udelay(1);
 477         iowrite32(V_LCD_DISPLAY_ON, dum_data.slave_virt_base);
 478         udelay(1);
 479 }
 480
 481 /* Interface exported to framebuffer drivers */
 482
 483 int pnx4008_get_fb_addresses(int fb_type, void **virt_addr,
 484                              dma_addr_t *phys_addr, int *fb_length)
 485 {
 486         int i;
 487         int ret = -1;
 488         for (i = 0; i < ARRAY_SIZE(fb_addr); i++)
 489                 if (fb_addr[i].fb_type == fb_type) {
 490                         *virt_addr = (void *)(dum_data.lcd_virt_start +
 491                                         fb_addr[i].addr_offset);
 492                         *phys_addr =
 493                             dum_data.lcd_phys_start + fb_addr[i].addr_offset;
 494                         *fb_length = fb_addr[i].fb_length;
 495                         ret = 0;
 496                         break;
 497                 }
 498
 499         return ret;
 500 }
 501
 502 EXPORT_SYMBOL(pnx4008_get_fb_addresses);
 503
 504 int pnx4008_alloc_dum_channel(int dev_id)
 505 {
 506         int i = 0;
 507
 508         while ((i < MAX_DUM_CHANNELS) && (dum_data.fb_owning_channel[i] != -1))
 509                 i++;
 510
 511         if (i == MAX_DUM_CHANNELS)
 512                 return -ENORESOURCESLEFT;
 513         else {
 514                 dum_data.fb_owning_channel[i] = dev_id;
 515                 return i;
 516         }
 517 }
 518
 519 EXPORT_SYMBOL(pnx4008_alloc_dum_channel);
 520
 521 int pnx4008_free_dum_channel(int channr, int dev_id)
 522 {
 523         if (channr < 0 || channr > MAX_DUM_CHANNELS)
 524                 return -EINVAL;
 525         else if (dum_data.fb_owning_channel[channr] != dev_id)
 526                 return -EFBNOTOWNER;
 527         else {
 528                 clear_channel(channr);
 529                 dum_data.fb_owning_channel[channr] = -1;
 530         }
 531
 532         return 0;
 533 }
 534
 535 EXPORT_SYMBOL(pnx4008_free_dum_channel);
 536
 537 int pnx4008_put_dum_channel_uf(struct dumchannel_uf chan_uf, int dev_id)
 538 {
 539         int i = chan_uf.channelnr;
 540         int ret;
 541
 542         if (i < 0 || i > MAX_DUM_CHANNELS)
 543                 return -EINVAL;
 544         else if (dum_data.fb_owning_channel[i] != dev_id)
 545                 return -EFBNOTOWNER;
 546         else if ((ret =
 547                   display_open(chan_uf.channelnr, 0, chan_uf.dirty,
 548                                chan_uf.source, chan_uf.y_offset,
 549                                chan_uf.x_offset, chan_uf.height,
 550                                chan_uf.width)) != 0)
 551                 return ret;
 552         else {
 553                 dum_data.chan_uf_store[i].dirty = chan_uf.dirty;
 554                 dum_data.chan_uf_store[i].source = chan_uf.source;
 555                 dum_data.chan_uf_store[i].x_offset = chan_uf.x_offset;
 556                 dum_data.chan_uf_store[i].y_offset = chan_uf.y_offset;
 557                 dum_data.chan_uf_store[i].width = chan_uf.width;
 558                 dum_data.chan_uf_store[i].height = chan_uf.height;
 559         }
 560
 561         return 0;
 562 }
 563
 564 EXPORT_SYMBOL(pnx4008_put_dum_channel_uf);
 565
 566 int pnx4008_set_dum_channel_sync(int channr, int val, int dev_id)
 567 {
 568         if (channr < 0 || channr > MAX_DUM_CHANNELS)
 569                 return -EINVAL;
 570         else if (dum_data.fb_owning_channel[channr] != dev_id)
 571                 return -EFBNOTOWNER;
 572         else {
 573                 if (val == CONF_SYNC_ON) {
 574                         DUM_CH_CONF(channr) |= CONF_SYNCENABLE;
 575                         DUM_CH_CONF(channr) |= DUM_CHANNEL_CFG_SYNC_MASK |
 576                                 DUM_CHANNEL_CFG_SYNC_MASK_SET;
 577                 } else if (val == CONF_SYNC_OFF)
 578                         DUM_CH_CONF(channr) &= ~CONF_SYNCENABLE;
 579                 else
 580                         return -EINVAL;
 581         }
 582
 583         return 0;
 584 }
 585
 586 EXPORT_SYMBOL(pnx4008_set_dum_channel_sync);
 587
 588 int pnx4008_set_dum_channel_dirty_detect(int channr, int val, int dev_id)
 589 {
 590         if (channr < 0 || channr > MAX_DUM_CHANNELS)
 591                 return -EINVAL;
 592         else if (dum_data.fb_owning_channel[channr] != dev_id)
 593                 return -EFBNOTOWNER;
 594         else {
 595                 if (val == CONF_DIRTYDETECTION_ON)
 596                         DUM_CH_CONF(channr) |= CONF_DIRTYENABLE;
 597                 else if (val == CONF_DIRTYDETECTION_OFF)
 598                         DUM_CH_CONF(channr) &= ~CONF_DIRTYENABLE;
 599                 else
 600                         return -EINVAL;
 601         }
 602
 603         return 0;
 604 }
 605
 606 EXPORT_SYMBOL(pnx4008_set_dum_channel_dirty_detect);
 607
 608 #if 0 /* Functions not used currently, but likely to be used in future */
 609
 610 static int get_channel(struct dumchannel *p_chan)
 611 {
 612         int i = p_chan->channelnr;
 613
 614         if (i < 0 || i > MAX_DUM_CHANNELS)
 615                 return -EINVAL;
 616         else {
 617                 p_chan->dum_ch_min = DUM_CH_MIN(i);
 618                 p_chan->dum_ch_max = DUM_CH_MAX(i);
 619                 p_chan->dum_ch_conf = DUM_CH_CONF(i);
 620                 p_chan->dum_ch_stat = DUM_CH_STAT(i);
 621                 p_chan->dum_ch_ctrl = 0;        /* WriteOnly control register */
 622         }
 623
 624         return 0;
 625 }
 626
 627 int pnx4008_get_dum_channel_uf(struct dumchannel_uf *p_chan_uf, int dev_id)
 628 {
 629         int i = p_chan_uf->channelnr;
 630
 631         if (i < 0 || i > MAX_DUM_CHANNELS)
 632                 return -EINVAL;
 633         else if (dum_data.fb_owning_channel[i] != dev_id)
 634                 return -EFBNOTOWNER;
 635         else {
 636                 p_chan_uf->dirty = dum_data.chan_uf_store[i].dirty;
 637                 p_chan_uf->source = dum_data.chan_uf_store[i].source;
 638                 p_chan_uf->x_offset = dum_data.chan_uf_store[i].x_offset;
 639                 p_chan_uf->y_offset = dum_data.chan_uf_store[i].y_offset;
 640                 p_chan_uf->width = dum_data.chan_uf_store[i].width;
 641                 p_chan_uf->height = dum_data.chan_uf_store[i].height;
 642         }
 643
 644         return 0;
 645 }
 646
 647 EXPORT_SYMBOL(pnx4008_get_dum_channel_uf);
 648
 649 int pnx4008_get_dum_channel_config(int channr, int dev_id)
 650 {
 651         int ret;
 652         struct dumchannel chan;
 653
 654         if (channr < 0 || channr > MAX_DUM_CHANNELS)
 655                 return -EINVAL;
 656         else if (dum_data.fb_owning_channel[channr] != dev_id)
 657                 return -EFBNOTOWNER;
 658         else {
 659                 chan.channelnr = channr;
 660                 if ((ret = get_channel(&chan)) != 0)
 661                         return ret;
 662         }
 663
 664         return (chan.dum_ch_conf & DUM_CHANNEL_CFG_MASK);
 665 }
 666
 667 EXPORT_SYMBOL(pnx4008_get_dum_channel_config);
 668
 669 int pnx4008_force_update_dum_channel(int channr, int dev_id)
 670 {
 671         if (channr < 0 || channr > MAX_DUM_CHANNELS)
 672                 return -EINVAL;
 673
 674         else if (dum_data.fb_owning_channel[channr] != dev_id)
 675                 return -EFBNOTOWNER;
 676         else
 677                 DUM_CH_CTRL(channr) = CTRL_SETDIRTY;
 678
 679         return 0;
 680 }
 681
 682 EXPORT_SYMBOL(pnx4008_force_update_dum_channel);
 683
 684 #endif
 685
 686 int pnx4008_sdum_mmap(struct fb_info *info, struct vm_area_struct *vma,
 687                       struct device *dev)
 688 {
 689         unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
 690
 691         if (off < info->fix.smem_len) {
 692                 vma->vm_pgoff += 1;
 693                 return dma_mmap_writecombine(dev, vma,
 694                                 (void *)dum_data.lcd_virt_start,
 695                                 dum_data.lcd_phys_start,
 696                                 FB_DMA_SIZE);
 697         }
 698         return -EINVAL;
 699 }
 700
 701 EXPORT_SYMBOL(pnx4008_sdum_mmap);
 702
 703 int pnx4008_set_dum_exit_notification(int dev_id)
 704 {
 705         int i;
 706
 707         for (i = 0; i < MAX_DUM_CHANNELS; i++)
 708                 if (dum_data.fb_owning_channel[i] == dev_id)
 709                         return -ERESOURCESNOTFREED;
 710
 711         return 0;
 712 }
 713
 714 EXPORT_SYMBOL(pnx4008_set_dum_exit_notification);
 715
 716 /* Platform device driver for DUM */
 717
 718 static int sdum_suspend(struct platform_device *pdev, pm_message_t state)
 719 {
 720         int retval = 0;
 721         struct clk *clk;
 722
 723         clk = clk_get(0, "dum_ck");
 724         if (!IS_ERR(clk)) {
 725                 clk_set_rate(clk, 0);
 726                 clk_put(clk);
 727         } else
 728                 retval = PTR_ERR(clk);
 729
 730         /* disable BAC */
 731         DUM_CTRL = V_BAC_DISABLE_IDLE;
 732
 733         /* LCD standby & turn off display */
 734         lcd_reset();
 735
 736         return retval;
 737 }
 738
 739 static int sdum_resume(struct platform_device *pdev)
 740 {
 741         int retval = 0;
 742         struct clk *clk;
 743
 744         clk = clk_get(0, "dum_ck");
 745         if (!IS_ERR(clk)) {
 746                 clk_set_rate(clk, 1);
 747                 clk_put(clk);
 748         } else
 749                 retval = PTR_ERR(clk);
 750
 751         /* wait for BAC disable */
 752         DUM_CTRL = V_BAC_DISABLE_TRIG;
 753
 754         while (DUM_CTRL & BAC_ENABLED)
 755                 udelay(10);
 756
 757         /* re-init LCD */
 758         lcd_init();
 759
 760         /* enable BAC and reset MUX */
 761         DUM_CTRL = V_BAC_ENABLE;
 762         udelay(1);
 763         DUM_CTRL = V_MUX_RESET;
 764         return 0;
 765 }
 766
 767 static int __devinit sdum_probe(struct platform_device *pdev)
 768 {
 769         int ret = 0, i = 0;
 770
 771         /* map frame buffer */
 772         dum_data.lcd_virt_start = (u32) dma_alloc_writecombine(&pdev->dev,
 773                                                        FB_DMA_SIZE,
 774                                                        &dum_data.lcd_phys_start,
 775                                                        GFP_KERNEL);
 776
 777         if (!dum_data.lcd_virt_start) {
 778                 ret = -ENOMEM;
 779                 goto out_3;
 780         }
 781
 782         /* map slave registers */
 783         dum_data.slave_phys_base = PNX4008_DUM_SLAVE_BASE;
 784         dum_data.slave_virt_base =
 785             (u32 *) ioremap_nocache(dum_data.slave_phys_base, sizeof(u32));
 786
 787         if (dum_data.slave_virt_base == NULL) {
 788                 ret = -ENOMEM;
 789                 goto out_2;
 790         }
 791
 792         /* initialize DUM and LCD display */
 793         ret = dum_init(pdev);
 794         if (ret)
 795                 goto out_1;
 796
 797         dum_chan_init();
 798         lcd_init();
 799
 800         DUM_CTRL = V_BAC_ENABLE;
 801         udelay(1);
 802         DUM_CTRL = V_MUX_RESET;
 803
 804         /* set decode address and sync clock divider */
 805         DUM_DECODE = dum_data.lcd_phys_start & DUM_DECODE_MASK;
 806         DUM_CLK_DIV = PNX4008_DUM_CLK_DIV;
 807
 808         for (i = 0; i < MAX_DUM_CHANNELS; i++)
 809                 dum_data.fb_owning_channel[i] = -1;
 810
 811         /*setup wakeup interrupt */
 812         start_int_set_rising_edge(SE_DISP_SYNC_INT);
 813         start_int_ack(SE_DISP_SYNC_INT);
 814         start_int_umask(SE_DISP_SYNC_INT);
 815
 816         return 0;
 817
 818 out_1:
 819         iounmap((void *)dum_data.slave_virt_base);
 820 out_2:
 821         dma_free_writecombine(&pdev->dev, FB_DMA_SIZE,
 822                         (void *)dum_data.lcd_virt_start,
 823                         dum_data.lcd_phys_start);
 824 out_3:
 825         return ret;
 826 }
 827
 828 static int sdum_remove(struct platform_device *pdev)
 829 {
 830         struct clk *clk;
 831
 832         start_int_mask(SE_DISP_SYNC_INT);
 833
 834         clk = clk_get(0, "dum_ck");
 835         if (!IS_ERR(clk)) {
 836                 clk_set_rate(clk, 0);
 837                 clk_put(clk);
 838         }
 839
 840         iounmap((void *)dum_data.slave_virt_base);
 841
 842         dma_free_writecombine(&pdev->dev, FB_DMA_SIZE,
 843                         (void *)dum_data.lcd_virt_start,
 844                         dum_data.lcd_phys_start);
 845
 846         return 0;
 847 }
 848
 849 static struct platform_driver sdum_driver = {
 850         .driver = {
 851                 .name = "pnx4008-sdum",
 852         },
 853         .probe = sdum_probe,
 854         .remove = sdum_remove,
 855         .suspend = sdum_suspend,
 856         .resume = sdum_resume,
 857 };
 858
 859 int __init sdum_init(void)
 860 {
 861         return platform_driver_register(&sdum_driver);
 862 }
 863
 864 static void __exit sdum_exit(void)
 865 {
 866         platform_driver_unregister(&sdum_driver);
 867 };
 868
 869 module_init(sdum_init);
 870 module_exit(sdum_exit);
 871
 872 MODULE_LICENSE("GPL");