drivers/video/sh_mipi_dsi.c

   1 /*
   2  * Renesas SH-mobile MIPI DSI support
   3  *
   4  * Copyright (C) 2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
   5  *
   6  * This is free software; you can redistribute it and/or modify
   7  * it under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/bitmap.h>
  12 #include <linux/clk.h>
  13 #include <linux/delay.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm_runtime.h>
  18 #include <linux/slab.h>
  19 #include <linux/string.h>
  20 #include <linux/types.h>
  21 #include <linux/module.h>
  22
  23 #include <video/mipi_display.h>
  24 #include <video/sh_mipi_dsi.h>
  25 #include <video/sh_mobile_lcdc.h>
  26
  27 #include "sh_mobile_lcdcfb.h"
  28
  29 #define SYSCTRL         0x0000
  30 #define SYSCONF         0x0004
  31 #define TIMSET          0x0008
  32 #define RESREQSET0      0x0018
  33 #define RESREQSET1      0x001c
  34 #define HSTTOVSET       0x0020
  35 #define LPRTOVSET       0x0024
  36 #define TATOVSET        0x0028
  37 #define PRTOVSET        0x002c
  38 #define DSICTRL         0x0030
  39 #define DSIINTE         0x0060
  40 #define PHYCTRL         0x0070
  41
  42 /* relative to linkbase */
  43 #define DTCTR           0x0000
  44 #define VMCTR1          0x0020
  45 #define VMCTR2          0x0024
  46 #define VMLEN1          0x0028
  47 #define VMLEN2          0x002c
  48 #define CMTSRTREQ       0x0070
  49 #define CMTSRTCTR       0x00d0
  50
  51 /* E.g., sh7372 has 2 MIPI-DSIs - one for each LCDC */
  52 #define MAX_SH_MIPI_DSI 2
  53
  54 struct sh_mipi {
  55         struct sh_mobile_lcdc_entity entity;
  56
  57         void __iomem    *base;
  58         void __iomem    *linkbase;
  59         struct clk      *dsit_clk;
  60         struct platform_device *pdev;
  61 };
  62
  63 #define to_sh_mipi(e)   container_of(e, struct sh_mipi, entity)
  64
  65 static struct sh_mipi *mipi_dsi[MAX_SH_MIPI_DSI];
  66
  67 /* Protect the above array */
  68 static DEFINE_MUTEX(array_lock);
  69
  70 static struct sh_mipi *sh_mipi_by_handle(int handle)
  71 {
  72         if (handle >= ARRAY_SIZE(mipi_dsi) || handle < 0)
  73                 return NULL;
  74
  75         return mipi_dsi[handle];
  76 }
  77
  78 static int sh_mipi_send_short(struct sh_mipi *mipi, u8 dsi_cmd,
  79                               u8 cmd, u8 param)
  80 {
  81         u32 data = (dsi_cmd << 24) | (cmd << 16) | (param << 8);
  82         int cnt = 100;
  83
  84         /* transmit a short packet to LCD panel */
  85         iowrite32(1 | data, mipi->linkbase + CMTSRTCTR);
  86         iowrite32(1, mipi->linkbase + CMTSRTREQ);
  87
  88         while ((ioread32(mipi->linkbase + CMTSRTREQ) & 1) && --cnt)
  89                 udelay(1);
  90
  91         return cnt ? 0 : -ETIMEDOUT;
  92 }
  93
  94 #define LCD_CHAN2MIPI(c) ((c) < LCDC_CHAN_MAINLCD || (c) > LCDC_CHAN_SUBLCD ? \
  95                                 -EINVAL : (c) - 1)
  96
  97 static int sh_mipi_dcs(int handle, u8 cmd)
  98 {
  99         struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
 100         if (!mipi)
 101                 return -ENODEV;
 102         return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE, cmd, 0);
 103 }
 104
 105 static int sh_mipi_dcs_param(int handle, u8 cmd, u8 param)
 106 {
 107         struct sh_mipi *mipi = sh_mipi_by_handle(LCD_CHAN2MIPI(handle));
 108         if (!mipi)
 109                 return -ENODEV;
 110         return sh_mipi_send_short(mipi, MIPI_DSI_DCS_SHORT_WRITE_PARAM, cmd,
 111                                   param);
 112 }
 113
 114 static void sh_mipi_dsi_enable(struct sh_mipi *mipi, bool enable)
 115 {
 116         /*
 117          * enable LCDC data tx, transition to LPS after completion of each HS
 118          * packet
 119          */
 120         iowrite32(0x00000002 | enable, mipi->linkbase + DTCTR);
 121 }
 122
 123 static void sh_mipi_shutdown(struct platform_device *pdev)
 124 {
 125         struct sh_mipi *mipi = to_sh_mipi(platform_get_drvdata(pdev));
 126
 127         sh_mipi_dsi_enable(mipi, false);
 128 }
 129
 130 static int sh_mipi_setup(struct sh_mipi *mipi, const struct fb_videomode *mode)
 131 {
 132         void __iomem *base = mipi->base;
 133         struct sh_mipi_dsi_info *pdata = mipi->pdev->dev.platform_data;
 134         u32 pctype, datatype, pixfmt, linelength, vmctr2;
 135         u32 tmp, top, bottom, delay, div;
 136         int bpp;
 137
 138         /*
 139          * Select data format. MIPI DSI is not hot-pluggable, so, we just use
 140          * the default videomode. If this ever becomes a problem, We'll have to
 141          * move this to mipi_display_on() above and use info->var.xres
 142          */
 143         switch (pdata->data_format) {
 144         case MIPI_RGB888:
 145                 pctype = 0;
 146                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
 147                 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 148                 linelength = mode->xres * 3;
 149                 break;
 150         case MIPI_RGB565:
 151                 pctype = 1;
 152                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
 153                 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 154                 linelength = mode->xres * 2;
 155                 break;
 156         case MIPI_RGB666_LP:
 157                 pctype = 2;
 158                 datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
 159                 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 160                 linelength = mode->xres * 3;
 161                 break;
 162         case MIPI_RGB666:
 163                 pctype = 3;
 164                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
 165                 pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
 166                 linelength = (mode->xres * 18 + 7) / 8;
 167                 break;
 168         case MIPI_BGR888:
 169                 pctype = 8;
 170                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_24;
 171                 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 172                 linelength = mode->xres * 3;
 173                 break;
 174         case MIPI_BGR565:
 175                 pctype = 9;
 176                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_16;
 177                 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 178                 linelength = mode->xres * 2;
 179                 break;
 180         case MIPI_BGR666_LP:
 181                 pctype = 0xa;
 182                 datatype = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
 183                 pixfmt = MIPI_DCS_PIXEL_FMT_24BIT;
 184                 linelength = mode->xres * 3;
 185                 break;
 186         case MIPI_BGR666:
 187                 pctype = 0xb;
 188                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_18;
 189                 pixfmt = MIPI_DCS_PIXEL_FMT_18BIT;
 190                 linelength = (mode->xres * 18 + 7) / 8;
 191                 break;
 192         case MIPI_YUYV:
 193                 pctype = 4;
 194                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
 195                 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 196                 linelength = mode->xres * 2;
 197                 break;
 198         case MIPI_UYVY:
 199                 pctype = 5;
 200                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR16;
 201                 pixfmt = MIPI_DCS_PIXEL_FMT_16BIT;
 202                 linelength = mode->xres * 2;
 203                 break;
 204         case MIPI_YUV420_L:
 205                 pctype = 6;
 206                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
 207                 pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
 208                 linelength = (mode->xres * 12 + 7) / 8;
 209                 break;
 210         case MIPI_YUV420:
 211                 pctype = 7;
 212                 datatype = MIPI_DSI_PACKED_PIXEL_STREAM_YCBCR12;
 213                 pixfmt = MIPI_DCS_PIXEL_FMT_12BIT;
 214                 /* Length of U/V line */
 215                 linelength = (mode->xres + 1) / 2;
 216                 break;
 217         default:
 218                 return -EINVAL;
 219         }
 220
 221         if (!pdata->lane)
 222                 return -EINVAL;
 223
 224         /* reset DSI link */
 225         iowrite32(0x00000001, base + SYSCTRL);
 226         /* Hold reset for 100 cycles of the slowest of bus, HS byte and LP clock */
 227         udelay(50);
 228         iowrite32(0x00000000, base + SYSCTRL);
 229
 230         /* setup DSI link */
 231
 232         /*
 233          * T_wakeup = 0x7000
 234          * T_hs-trail = 3
 235          * T_hs-prepare = 3
 236          * T_clk-trail = 3
 237          * T_clk-prepare = 2
 238          */
 239         iowrite32(0x70003332, base + TIMSET);
 240         /* no responses requested */
 241         iowrite32(0x00000000, base + RESREQSET0);
 242         /* request response to packets of type 0x28 */
 243         iowrite32(0x00000100, base + RESREQSET1);
 244         /* High-speed transmission timeout, default 0xffffffff */
 245         iowrite32(0x0fffffff, base + HSTTOVSET);
 246         /* LP reception timeout, default 0xffffffff */
 247         iowrite32(0x0fffffff, base + LPRTOVSET);
 248         /* Turn-around timeout, default 0xffffffff */
 249         iowrite32(0x0fffffff, base + TATOVSET);
 250         /* Peripheral reset timeout, default 0xffffffff */
 251         iowrite32(0x0fffffff, base + PRTOVSET);
 252         /* Interrupts not used, disable all */
 253         iowrite32(0, base + DSIINTE);
 254         /* DSI-Tx bias on */
 255         iowrite32(0x00000001, base + PHYCTRL);
 256         udelay(200);
 257         /* Deassert resets, power on */
 258         iowrite32(0x03070001 | pdata->phyctrl, base + PHYCTRL);
 259
 260         /*
 261          * Default = ULPS enable |
 262          *      Contention detection enabled |
 263          *      EoT packet transmission enable |
 264          *      CRC check enable |
 265          *      ECC check enable
 266          */
 267         bitmap_fill((unsigned long *)&tmp, pdata->lane);
 268         tmp |= 0x00003700;
 269         iowrite32(tmp, base + SYSCONF);
 270
 271         /* setup l-bridge */
 272
 273         /*
 274          * Enable transmission of all packets,
 275          * transmit LPS after each HS packet completion
 276          */
 277         iowrite32(0x00000006, mipi->linkbase + DTCTR);
 278         /* VSYNC width = 2 (<< 17) */
 279         iowrite32((mode->vsync_len << pdata->vsynw_offset) |
 280                   (pdata->clksrc << 16) | (pctype << 12) | datatype,
 281                   mipi->linkbase + VMCTR1);
 282
 283         /*
 284          * Non-burst mode with sync pulses: VSE and HSE are output,
 285          * HSA period allowed, no commands in LP
 286          */
 287         vmctr2 = 0;
 288         if (pdata->flags & SH_MIPI_DSI_VSEE)
 289                 vmctr2 |= 1 << 23;
 290         if (pdata->flags & SH_MIPI_DSI_HSEE)
 291                 vmctr2 |= 1 << 22;
 292         if (pdata->flags & SH_MIPI_DSI_HSAE)
 293                 vmctr2 |= 1 << 21;
 294         if (pdata->flags & SH_MIPI_DSI_BL2E)
 295                 vmctr2 |= 1 << 17;
 296         if (pdata->flags & SH_MIPI_DSI_HSABM)
 297                 vmctr2 |= 1 << 5;
 298         if (pdata->flags & SH_MIPI_DSI_HBPBM)
 299                 vmctr2 |= 1 << 4;
 300         if (pdata->flags & SH_MIPI_DSI_HFPBM)
 301                 vmctr2 |= 1 << 3;
 302         iowrite32(vmctr2, mipi->linkbase + VMCTR2);
 303
 304         /*
 305          * VMLEN1 = RGBLEN | HSALEN
 306          *
 307          * see
 308          *  Video mode - Blanking Packet setting
 309          */
 310         top = linelength << 16; /* RGBLEN */
 311         bottom = 0x00000001;
 312         if (pdata->flags & SH_MIPI_DSI_HSABM) /* HSALEN */
 313                 bottom = (pdata->lane * mode->hsync_len) - 10;
 314         iowrite32(top | bottom , mipi->linkbase + VMLEN1);
 315
 316         /*
 317          * VMLEN2 = HBPLEN | HFPLEN
 318          *
 319          * see
 320          *  Video mode - Blanking Packet setting
 321          */
 322         top     = 0x00010000;
 323         bottom  = 0x00000001;
 324         delay   = 0;
 325
 326         div = 1;        /* HSbyteCLK is calculation base
 327                          * HS4divCLK = HSbyteCLK/2
 328                          * HS6divCLK is not supported for now */
 329         if (pdata->flags & SH_MIPI_DSI_HS4divCLK)
 330                 div = 2;
 331
 332         if (pdata->flags & SH_MIPI_DSI_HFPBM) { /* HBPLEN */
 333                 top = mode->hsync_len + mode->left_margin;
 334                 top = ((pdata->lane * top / div) - 10) << 16;
 335         }
 336         if (pdata->flags & SH_MIPI_DSI_HBPBM) { /* HFPLEN */
 337                 bottom = mode->right_margin;
 338                 bottom = (pdata->lane * bottom / div) - 12;
 339         }
 340
 341         bpp = linelength / mode->xres; /* byte / pixel */
 342         if ((pdata->lane / div) > bpp) {
 343                 tmp = mode->xres / bpp; /* output cycle */
 344                 tmp = mode->xres - tmp; /* (input - output) cycle */
 345                 delay = (pdata->lane * tmp);
 346         }
 347
 348         iowrite32(top | (bottom + delay) , mipi->linkbase + VMLEN2);
 349
 350         msleep(5);
 351
 352         /* setup LCD panel */
 353
 354         /* cf. drivers/video/omap/lcd_mipid.c */
 355         sh_mipi_dcs(pdata->channel, MIPI_DCS_EXIT_SLEEP_MODE);
 356         msleep(120);
 357         /*
 358          * [7] - Page Address Mode
 359          * [6] - Column Address Mode
 360          * [5] - Page / Column Address Mode
 361          * [4] - Display Device Line Refresh Order
 362          * [3] - RGB/BGR Order
 363          * [2] - Display Data Latch Data Order
 364          * [1] - Flip Horizontal
 365          * [0] - Flip Vertical
 366          */
 367         sh_mipi_dcs_param(pdata->channel, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
 368         /* cf. set_data_lines() */
 369         sh_mipi_dcs_param(pdata->channel, MIPI_DCS_SET_PIXEL_FORMAT,
 370                           pixfmt << 4);
 371         sh_mipi_dcs(pdata->channel, MIPI_DCS_SET_DISPLAY_ON);
 372
 373         /* Enable timeout counters */
 374         iowrite32(0x00000f00, base + DSICTRL);
 375
 376         return 0;
 377 }
 378
 379 static int mipi_display_on(struct sh_mobile_lcdc_entity *entity)
 380 {
 381         struct sh_mipi *mipi = to_sh_mipi(entity);
 382         struct sh_mipi_dsi_info *pdata = mipi->pdev->dev.platform_data;
 383         int ret;
 384
 385         pm_runtime_get_sync(&mipi->pdev->dev);
 386
 387         ret = pdata->set_dot_clock(mipi->pdev, mipi->base, 1);
 388         if (ret < 0)
 389                 goto mipi_display_on_fail1;
 390
 391         ret = sh_mipi_setup(mipi, &entity->def_mode);
 392         if (ret < 0)
 393                 goto mipi_display_on_fail2;
 394
 395         sh_mipi_dsi_enable(mipi, true);
 396
 397         return SH_MOBILE_LCDC_DISPLAY_CONNECTED;
 398
 399 mipi_display_on_fail1:
 400         pm_runtime_put_sync(&mipi->pdev->dev);
 401 mipi_display_on_fail2:
 402         pdata->set_dot_clock(mipi->pdev, mipi->base, 0);
 403
 404         return ret;
 405 }
 406
 407 static void mipi_display_off(struct sh_mobile_lcdc_entity *entity)
 408 {
 409         struct sh_mipi *mipi = to_sh_mipi(entity);
 410         struct sh_mipi_dsi_info *pdata = mipi->pdev->dev.platform_data;
 411
 412         sh_mipi_dsi_enable(mipi, false);
 413
 414         pdata->set_dot_clock(mipi->pdev, mipi->base, 0);
 415
 416         pm_runtime_put_sync(&mipi->pdev->dev);
 417 }
 418
 419 static const struct sh_mobile_lcdc_entity_ops mipi_ops = {
 420         .display_on = mipi_display_on,
 421         .display_off = mipi_display_off,
 422 };
 423
 424 static int __init sh_mipi_probe(struct platform_device *pdev)
 425 {
 426         struct sh_mipi *mipi;
 427         struct sh_mipi_dsi_info *pdata = pdev->dev.platform_data;
 428         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 429         struct resource *res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 430         unsigned long rate, f_current;
 431         int idx = pdev->id, ret;
 432
 433         if (!res || !res2 || idx >= ARRAY_SIZE(mipi_dsi) || !pdata)
 434                 return -ENODEV;
 435
 436         if (!pdata->set_dot_clock)
 437                 return -EINVAL;
 438
 439         mutex_lock(&array_lock);
 440         if (idx < 0)
 441                 for (idx = 0; idx < ARRAY_SIZE(mipi_dsi) && mipi_dsi[idx]; idx++)
 442                         ;
 443
 444         if (idx == ARRAY_SIZE(mipi_dsi)) {
 445                 ret = -EBUSY;
 446                 goto efindslot;
 447         }
 448
 449         mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
 450         if (!mipi) {
 451                 ret = -ENOMEM;
 452                 goto ealloc;
 453         }
 454
 455         mipi->entity.owner = THIS_MODULE;
 456         mipi->entity.ops = &mipi_ops;
 457
 458         if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
 459                 dev_err(&pdev->dev, "MIPI register region already claimed\n");
 460                 ret = -EBUSY;
 461                 goto ereqreg;
 462         }
 463
 464         mipi->base = ioremap(res->start, resource_size(res));
 465         if (!mipi->base) {
 466                 ret = -ENOMEM;
 467                 goto emap;
 468         }
 469
 470         if (!request_mem_region(res2->start, resource_size(res2), pdev->name)) {
 471                 dev_err(&pdev->dev, "MIPI register region 2 already claimed\n");
 472                 ret = -EBUSY;
 473                 goto ereqreg2;
 474         }
 475
 476         mipi->linkbase = ioremap(res2->start, resource_size(res2));
 477         if (!mipi->linkbase) {
 478                 ret = -ENOMEM;
 479                 goto emap2;
 480         }
 481
 482         mipi->pdev = pdev;
 483
 484         mipi->dsit_clk = clk_get(&pdev->dev, "dsit_clk");
 485         if (IS_ERR(mipi->dsit_clk)) {
 486                 ret = PTR_ERR(mipi->dsit_clk);
 487                 goto eclktget;
 488         }
 489
 490         f_current = clk_get_rate(mipi->dsit_clk);
 491         /* 80MHz required by the datasheet */
 492         rate = clk_round_rate(mipi->dsit_clk, 80000000);
 493         if (rate > 0 && rate != f_current)
 494                 ret = clk_set_rate(mipi->dsit_clk, rate);
 495         else
 496                 ret = rate;
 497         if (ret < 0)
 498                 goto esettrate;
 499
 500         dev_dbg(&pdev->dev, "DSI-T clk %lu -> %lu\n", f_current, rate);
 501
 502         ret = clk_enable(mipi->dsit_clk);
 503         if (ret < 0)
 504                 goto eclkton;
 505
 506         mipi_dsi[idx] = mipi;
 507
 508         pm_runtime_enable(&pdev->dev);
 509         pm_runtime_resume(&pdev->dev);
 510
 511         mutex_unlock(&array_lock);
 512         platform_set_drvdata(pdev, &mipi->entity);
 513
 514         return 0;
 515
 516 eclkton:
 517 esettrate:
 518         clk_put(mipi->dsit_clk);
 519 eclktget:
 520         iounmap(mipi->linkbase);
 521 emap2:
 522         release_mem_region(res2->start, resource_size(res2));
 523 ereqreg2:
 524         iounmap(mipi->base);
 525 emap:
 526         release_mem_region(res->start, resource_size(res));
 527 ereqreg:
 528         kfree(mipi);
 529 ealloc:
 530 efindslot:
 531         mutex_unlock(&array_lock);
 532
 533         return ret;
 534 }
 535
 536 static int sh_mipi_remove(struct platform_device *pdev)
 537 {
 538         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 539         struct resource *res2 = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 540         struct sh_mipi *mipi = to_sh_mipi(platform_get_drvdata(pdev));
 541         int i, ret;
 542
 543         mutex_lock(&array_lock);
 544
 545         for (i = 0; i < ARRAY_SIZE(mipi_dsi) && mipi_dsi[i] != mipi; i++)
 546                 ;
 547
 548         if (i == ARRAY_SIZE(mipi_dsi)) {
 549                 ret = -EINVAL;
 550         } else {
 551                 ret = 0;
 552                 mipi_dsi[i] = NULL;
 553         }
 554
 555         mutex_unlock(&array_lock);
 556
 557         if (ret < 0)
 558                 return ret;
 559
 560         pm_runtime_disable(&pdev->dev);
 561         clk_disable(mipi->dsit_clk);
 562         clk_put(mipi->dsit_clk);
 563
 564         iounmap(mipi->linkbase);
 565         if (res2)
 566                 release_mem_region(res2->start, resource_size(res2));
 567         iounmap(mipi->base);
 568         if (res)
 569                 release_mem_region(res->start, resource_size(res));
 570         platform_set_drvdata(pdev, NULL);
 571         kfree(mipi);
 572
 573         return 0;
 574 }
 575
 576 static struct platform_driver sh_mipi_driver = {
 577         .remove         = sh_mipi_remove,
 578         .shutdown       = sh_mipi_shutdown,
 579         .driver = {
 580                 .name   = "sh-mipi-dsi",
 581         },
 582 };
 583
 584 module_platform_driver_probe(sh_mipi_driver, sh_mipi_probe);
 585
 586 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 587 MODULE_DESCRIPTION("SuperH / ARM-shmobile MIPI DSI driver");
 588 MODULE_LICENSE("GPL v2");