arch/arm/mach-omap2/display.c

   1 /*
   2  * OMAP2plus display device setup / initialization.
   3  *
   4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
   5  *      Senthilvadivu Guruswamy
   6  *      Sumit Semwal
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  13  * kind, whether express or implied; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/string.h>
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/io.h>
  23 #include <linux/clk.h>
  24 #include <linux/err.h>
  25 #include <linux/delay.h>
  26
  27 #include <video/omapdss.h>
  28 #include <plat/omap_hwmod.h>
  29 #include <plat/omap_device.h>
  30 #include <plat/omap-pm.h>
  31 #include "common.h"
  32
  33 #include "iomap.h"
  34 #include "mux.h"
  35 #include "control.h"
  36 #include "display.h"
  37
  38 #define DISPC_CONTROL           0x0040
  39 #define DISPC_CONTROL2          0x0238
  40 #define DISPC_CONTROL3          0x0848
  41 #define DISPC_IRQSTATUS         0x0018
  42
  43 #define DSS_SYSCONFIG           0x10
  44 #define DSS_SYSSTATUS           0x14
  45 #define DSS_CONTROL             0x40
  46 #define DSS_SDI_CONTROL         0x44
  47 #define DSS_PLL_CONTROL         0x48
  48
  49 #define LCD_EN_MASK             (0x1 << 0)
  50 #define DIGIT_EN_MASK           (0x1 << 1)
  51
  52 #define FRAMEDONE_IRQ_SHIFT     0
  53 #define EVSYNC_EVEN_IRQ_SHIFT   2
  54 #define EVSYNC_ODD_IRQ_SHIFT    3
  55 #define FRAMEDONE2_IRQ_SHIFT    22
  56 #define FRAMEDONE3_IRQ_SHIFT    30
  57 #define FRAMEDONETV_IRQ_SHIFT   24
  58
  59 /*
  60  * FRAMEDONE_IRQ_TIMEOUT: how long (in milliseconds) to wait during DISPC
  61  *     reset before deciding that something has gone wrong
  62  */
  63 #define FRAMEDONE_IRQ_TIMEOUT           100
  64
  65 static struct platform_device omap_display_device = {
  66         .name          = "omapdss",
  67         .id            = -1,
  68         .dev            = {
  69                 .platform_data = NULL,
  70         },
  71 };
  72
  73 struct omap_dss_hwmod_data {
  74         const char *oh_name;
  75         const char *dev_name;
  76         const int id;
  77 };
  78
  79 static const struct omap_dss_hwmod_data omap2_dss_hwmod_data[] __initconst = {
  80         { "dss_core", "omapdss_dss", -1 },
  81         { "dss_dispc", "omapdss_dispc", -1 },
  82         { "dss_rfbi", "omapdss_rfbi", -1 },
  83         { "dss_venc", "omapdss_venc", -1 },
  84 };
  85
  86 static const struct omap_dss_hwmod_data omap3_dss_hwmod_data[] __initconst = {
  87         { "dss_core", "omapdss_dss", -1 },
  88         { "dss_dispc", "omapdss_dispc", -1 },
  89         { "dss_rfbi", "omapdss_rfbi", -1 },
  90         { "dss_venc", "omapdss_venc", -1 },
  91         { "dss_dsi1", "omapdss_dsi", 0 },
  92 };
  93
  94 static const struct omap_dss_hwmod_data omap4_dss_hwmod_data[] __initconst = {
  95         { "dss_core", "omapdss_dss", -1 },
  96         { "dss_dispc", "omapdss_dispc", -1 },
  97         { "dss_rfbi", "omapdss_rfbi", -1 },
  98         { "dss_dsi1", "omapdss_dsi", 0 },
  99         { "dss_dsi2", "omapdss_dsi", 1 },
 100         { "dss_hdmi", "omapdss_hdmi", -1 },
 101 };
 102
 103 static void __init omap4_hdmi_mux_pads(enum omap_hdmi_flags flags)
 104 {
 105         u32 reg;
 106         u16 control_i2c_1;
 107
 108         omap_mux_init_signal("hdmi_cec",
 109                         OMAP_PIN_INPUT_PULLUP);
 110         omap_mux_init_signal("hdmi_ddc_scl",
 111                         OMAP_PIN_INPUT_PULLUP);
 112         omap_mux_init_signal("hdmi_ddc_sda",
 113                         OMAP_PIN_INPUT_PULLUP);
 114
 115         /*
 116          * CONTROL_I2C_1: HDMI_DDC_SDA_PULLUPRESX (bit 28) and
 117          * HDMI_DDC_SCL_PULLUPRESX (bit 24) are set to disable
 118          * internal pull up resistor.
 119          */
 120         if (flags & OMAP_HDMI_SDA_SCL_EXTERNAL_PULLUP) {
 121                 control_i2c_1 = OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_I2C_1;
 122                 reg = omap4_ctrl_pad_readl(control_i2c_1);
 123                 reg |= (OMAP4_HDMI_DDC_SDA_PULLUPRESX_MASK |
 124                         OMAP4_HDMI_DDC_SCL_PULLUPRESX_MASK);
 125                         omap4_ctrl_pad_writel(reg, control_i2c_1);
 126         }
 127 }
 128
 129 static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes)
 130 {
 131         u32 enable_mask, enable_shift;
 132         u32 pipd_mask, pipd_shift;
 133         u32 reg;
 134
 135         if (dsi_id == 0) {
 136                 enable_mask = OMAP4_DSI1_LANEENABLE_MASK;
 137                 enable_shift = OMAP4_DSI1_LANEENABLE_SHIFT;
 138                 pipd_mask = OMAP4_DSI1_PIPD_MASK;
 139                 pipd_shift = OMAP4_DSI1_PIPD_SHIFT;
 140         } else if (dsi_id == 1) {
 141                 enable_mask = OMAP4_DSI2_LANEENABLE_MASK;
 142                 enable_shift = OMAP4_DSI2_LANEENABLE_SHIFT;
 143                 pipd_mask = OMAP4_DSI2_PIPD_MASK;
 144                 pipd_shift = OMAP4_DSI2_PIPD_SHIFT;
 145         } else {
 146                 return -ENODEV;
 147         }
 148
 149         reg = omap4_ctrl_pad_readl(OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
 150
 151         reg &= ~enable_mask;
 152         reg &= ~pipd_mask;
 153
 154         reg |= (lanes << enable_shift) & enable_mask;
 155         reg |= (lanes << pipd_shift) & pipd_mask;
 156
 157         omap4_ctrl_pad_writel(reg, OMAP4_CTRL_MODULE_PAD_CORE_CONTROL_DSIPHY);
 158
 159         return 0;
 160 }
 161
 162 int __init omap_hdmi_init(enum omap_hdmi_flags flags)
 163 {
 164         if (cpu_is_omap44xx())
 165                 omap4_hdmi_mux_pads(flags);
 166
 167         return 0;
 168 }
 169
 170 static int omap_dsi_enable_pads(int dsi_id, unsigned lane_mask)
 171 {
 172         if (cpu_is_omap44xx())
 173                 return omap4_dsi_mux_pads(dsi_id, lane_mask);
 174
 175         return 0;
 176 }
 177
 178 static void omap_dsi_disable_pads(int dsi_id, unsigned lane_mask)
 179 {
 180         if (cpu_is_omap44xx())
 181                 omap4_dsi_mux_pads(dsi_id, 0);
 182 }
 183
 184 static int omap_dss_set_min_bus_tput(struct device *dev, unsigned long tput)
 185 {
 186         return omap_pm_set_min_bus_tput(dev, OCP_INITIATOR_AGENT, tput);
 187 }
 188
 189 static struct platform_device *create_dss_pdev(const char *pdev_name,
 190                 int pdev_id, const char *oh_name, void *pdata, int pdata_len,
 191                 struct platform_device *parent)
 192 {
 193         struct platform_device *pdev;
 194         struct omap_device *od;
 195         struct omap_hwmod *ohs[1];
 196         struct omap_hwmod *oh;
 197         int r;
 198
 199         oh = omap_hwmod_lookup(oh_name);
 200         if (!oh) {
 201                 pr_err("Could not look up %s\n", oh_name);
 202                 r = -ENODEV;
 203                 goto err;
 204         }
 205
 206         pdev = platform_device_alloc(pdev_name, pdev_id);
 207         if (!pdev) {
 208                 pr_err("Could not create pdev for %s\n", pdev_name);
 209                 r = -ENOMEM;
 210                 goto err;
 211         }
 212
 213         if (parent != NULL)
 214                 pdev->dev.parent = &parent->dev;
 215
 216         if (pdev->id != -1)
 217                 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
 218         else
 219                 dev_set_name(&pdev->dev, "%s", pdev->name);
 220
 221         ohs[0] = oh;
 222         od = omap_device_alloc(pdev, ohs, 1, NULL, 0);
 223         if (IS_ERR(od)) {
 224                 pr_err("Could not alloc omap_device for %s\n", pdev_name);
 225                 r = -ENOMEM;
 226                 goto err;
 227         }
 228
 229         r = platform_device_add_data(pdev, pdata, pdata_len);
 230         if (r) {
 231                 pr_err("Could not set pdata for %s\n", pdev_name);
 232                 goto err;
 233         }
 234
 235         r = omap_device_register(pdev);
 236         if (r) {
 237                 pr_err("Could not register omap_device for %s\n", pdev_name);
 238                 goto err;
 239         }
 240
 241         return pdev;
 242
 243 err:
 244         return ERR_PTR(r);
 245 }
 246
 247 static struct platform_device *create_simple_dss_pdev(const char *pdev_name,
 248                 int pdev_id, void *pdata, int pdata_len,
 249                 struct platform_device *parent)
 250 {
 251         struct platform_device *pdev;
 252         int r;
 253
 254         pdev = platform_device_alloc(pdev_name, pdev_id);
 255         if (!pdev) {
 256                 pr_err("Could not create pdev for %s\n", pdev_name);
 257                 r = -ENOMEM;
 258                 goto err;
 259         }
 260
 261         if (parent != NULL)
 262                 pdev->dev.parent = &parent->dev;
 263
 264         if (pdev->id != -1)
 265                 dev_set_name(&pdev->dev, "%s.%d", pdev->name, pdev->id);
 266         else
 267                 dev_set_name(&pdev->dev, "%s", pdev->name);
 268
 269         r = platform_device_add_data(pdev, pdata, pdata_len);
 270         if (r) {
 271                 pr_err("Could not set pdata for %s\n", pdev_name);
 272                 goto err;
 273         }
 274
 275         r = platform_device_add(pdev);
 276         if (r) {
 277                 pr_err("Could not register platform_device for %s\n", pdev_name);
 278                 goto err;
 279         }
 280
 281         return pdev;
 282
 283 err:
 284         return ERR_PTR(r);
 285 }
 286
 287 int __init omap_display_init(struct omap_dss_board_info *board_data)
 288 {
 289         int r = 0;
 290         struct platform_device *pdev;
 291         int i, oh_count;
 292         const struct omap_dss_hwmod_data *curr_dss_hwmod;
 293         struct platform_device *dss_pdev;
 294
 295         /* create omapdss device */
 296
 297         board_data->dsi_enable_pads = omap_dsi_enable_pads;
 298         board_data->dsi_disable_pads = omap_dsi_disable_pads;
 299         board_data->get_context_loss_count = omap_pm_get_dev_context_loss_count;
 300         board_data->set_min_bus_tput = omap_dss_set_min_bus_tput;
 301
 302         omap_display_device.dev.platform_data = board_data;
 303
 304         r = platform_device_register(&omap_display_device);
 305         if (r < 0) {
 306                 pr_err("Unable to register omapdss device\n");
 307                 return r;
 308         }
 309
 310         /* create devices for dss hwmods */
 311
 312         if (cpu_is_omap24xx()) {
 313                 curr_dss_hwmod = omap2_dss_hwmod_data;
 314                 oh_count = ARRAY_SIZE(omap2_dss_hwmod_data);
 315         } else if (cpu_is_omap34xx()) {
 316                 curr_dss_hwmod = omap3_dss_hwmod_data;
 317                 oh_count = ARRAY_SIZE(omap3_dss_hwmod_data);
 318         } else {
 319                 curr_dss_hwmod = omap4_dss_hwmod_data;
 320                 oh_count = ARRAY_SIZE(omap4_dss_hwmod_data);
 321         }
 322
 323         /*
 324          * First create the pdev for dss_core, which is used as a parent device
 325          * by the other dss pdevs. Note: dss_core has to be the first item in
 326          * the hwmod list.
 327          */
 328         dss_pdev = create_dss_pdev(curr_dss_hwmod[0].dev_name,
 329                         curr_dss_hwmod[0].id,
 330                         curr_dss_hwmod[0].oh_name,
 331                         board_data, sizeof(*board_data),
 332                         NULL);
 333
 334         if (IS_ERR(dss_pdev)) {
 335                 pr_err("Could not build omap_device for %s\n",
 336                                 curr_dss_hwmod[0].oh_name);
 337
 338                 return PTR_ERR(dss_pdev);
 339         }
 340
 341         for (i = 1; i < oh_count; i++) {
 342                 pdev = create_dss_pdev(curr_dss_hwmod[i].dev_name,
 343                                 curr_dss_hwmod[i].id,
 344                                 curr_dss_hwmod[i].oh_name,
 345                                 board_data, sizeof(*board_data),
 346                                 dss_pdev);
 347
 348                 if (IS_ERR(pdev)) {
 349                         pr_err("Could not build omap_device for %s\n",
 350                                         curr_dss_hwmod[i].oh_name);
 351
 352                         return PTR_ERR(pdev);
 353                 }
 354         }
 355
 356         /* Create devices for DPI and SDI */
 357
 358         pdev = create_simple_dss_pdev("omapdss_dpi", -1,
 359                         board_data, sizeof(*board_data), dss_pdev);
 360         if (IS_ERR(pdev)) {
 361                 pr_err("Could not build platform_device for omapdss_dpi\n");
 362                 return PTR_ERR(pdev);
 363         }
 364
 365         if (cpu_is_omap34xx()) {
 366                 pdev = create_simple_dss_pdev("omapdss_sdi", -1,
 367                                 board_data, sizeof(*board_data), dss_pdev);
 368                 if (IS_ERR(pdev)) {
 369                         pr_err("Could not build platform_device for omapdss_sdi\n");
 370                         return PTR_ERR(pdev);
 371                 }
 372         }
 373
 374         return 0;
 375 }
 376
 377 static void dispc_disable_outputs(void)
 378 {
 379         u32 v, irq_mask = 0;
 380         bool lcd_en, digit_en, lcd2_en = false, lcd3_en = false;
 381         int i;
 382         struct omap_dss_dispc_dev_attr *da;
 383         struct omap_hwmod *oh;
 384
 385         oh = omap_hwmod_lookup("dss_dispc");
 386         if (!oh) {
 387                 WARN(1, "display: could not disable outputs during reset - could not find dss_dispc hwmod\n");
 388                 return;
 389         }
 390
 391         if (!oh->dev_attr) {
 392                 pr_err("display: could not disable outputs during reset due to missing dev_attr\n");
 393                 return;
 394         }
 395
 396         da = (struct omap_dss_dispc_dev_attr *)oh->dev_attr;
 397
 398         /* store value of LCDENABLE and DIGITENABLE bits */
 399         v = omap_hwmod_read(oh, DISPC_CONTROL);
 400         lcd_en = v & LCD_EN_MASK;
 401         digit_en = v & DIGIT_EN_MASK;
 402
 403         /* store value of LCDENABLE for LCD2 */
 404         if (da->manager_count > 2) {
 405                 v = omap_hwmod_read(oh, DISPC_CONTROL2);
 406                 lcd2_en = v & LCD_EN_MASK;
 407         }
 408
 409         /* store value of LCDENABLE for LCD3 */
 410         if (da->manager_count > 3) {
 411                 v = omap_hwmod_read(oh, DISPC_CONTROL3);
 412                 lcd3_en = v & LCD_EN_MASK;
 413         }
 414
 415         if (!(lcd_en | digit_en | lcd2_en | lcd3_en))
 416                 return; /* no managers currently enabled */
 417
 418         /*
 419          * If any manager was enabled, we need to disable it before
 420          * DSS clocks are disabled or DISPC module is reset
 421          */
 422         if (lcd_en)
 423                 irq_mask |= 1 << FRAMEDONE_IRQ_SHIFT;
 424
 425         if (digit_en) {
 426                 if (da->has_framedonetv_irq) {
 427                         irq_mask |= 1 << FRAMEDONETV_IRQ_SHIFT;
 428                 } else {
 429                         irq_mask |= 1 << EVSYNC_EVEN_IRQ_SHIFT |
 430                                 1 << EVSYNC_ODD_IRQ_SHIFT;
 431                 }
 432         }
 433
 434         if (lcd2_en)
 435                 irq_mask |= 1 << FRAMEDONE2_IRQ_SHIFT;
 436         if (lcd3_en)
 437                 irq_mask |= 1 << FRAMEDONE3_IRQ_SHIFT;
 438
 439         /*
 440          * clear any previous FRAMEDONE, FRAMEDONETV,
 441          * EVSYNC_EVEN/ODD, FRAMEDONE2 or FRAMEDONE3 interrupts
 442          */
 443         omap_hwmod_write(irq_mask, oh, DISPC_IRQSTATUS);
 444
 445         /* disable LCD and TV managers */
 446         v = omap_hwmod_read(oh, DISPC_CONTROL);
 447         v &= ~(LCD_EN_MASK | DIGIT_EN_MASK);
 448         omap_hwmod_write(v, oh, DISPC_CONTROL);
 449
 450         /* disable LCD2 manager */
 451         if (da->manager_count > 2) {
 452                 v = omap_hwmod_read(oh, DISPC_CONTROL2);
 453                 v &= ~LCD_EN_MASK;
 454                 omap_hwmod_write(v, oh, DISPC_CONTROL2);
 455         }
 456
 457         /* disable LCD3 manager */
 458         if (da->manager_count > 3) {
 459                 v = omap_hwmod_read(oh, DISPC_CONTROL3);
 460                 v &= ~LCD_EN_MASK;
 461                 omap_hwmod_write(v, oh, DISPC_CONTROL3);
 462         }
 463
 464         i = 0;
 465         while ((omap_hwmod_read(oh, DISPC_IRQSTATUS) & irq_mask) !=
 466                irq_mask) {
 467                 i++;
 468                 if (i > FRAMEDONE_IRQ_TIMEOUT) {
 469                         pr_err("didn't get FRAMEDONE1/2/3 or TV interrupt\n");
 470                         break;
 471                 }
 472                 mdelay(1);
 473         }
 474 }
 475
 476 #define MAX_MODULE_SOFTRESET_WAIT       10000
 477 int omap_dss_reset(struct omap_hwmod *oh)
 478 {
 479         struct omap_hwmod_opt_clk *oc;
 480         int c = 0;
 481         int i, r;
 482
 483         if (!(oh->class->sysc->sysc_flags & SYSS_HAS_RESET_STATUS)) {
 484                 pr_err("dss_core: hwmod data doesn't contain reset data\n");
 485                 return -EINVAL;
 486         }
 487
 488         for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
 489                 if (oc->_clk)
 490                         clk_prepare_enable(oc->_clk);
 491
 492         dispc_disable_outputs();
 493
 494         /* clear SDI registers */
 495         if (cpu_is_omap3430()) {
 496                 omap_hwmod_write(0x0, oh, DSS_SDI_CONTROL);
 497                 omap_hwmod_write(0x0, oh, DSS_PLL_CONTROL);
 498         }
 499
 500         /*
 501          * clear DSS_CONTROL register to switch DSS clock sources to
 502          * PRCM clock, if any
 503          */
 504         omap_hwmod_write(0x0, oh, DSS_CONTROL);
 505
 506         omap_test_timeout((omap_hwmod_read(oh, oh->class->sysc->syss_offs)
 507                                 & SYSS_RESETDONE_MASK),
 508                         MAX_MODULE_SOFTRESET_WAIT, c);
 509
 510         if (c == MAX_MODULE_SOFTRESET_WAIT)
 511                 pr_warning("dss_core: waiting for reset to finish failed\n");
 512         else
 513                 pr_debug("dss_core: softreset done\n");
 514
 515         for (i = oh->opt_clks_cnt, oc = oh->opt_clks; i > 0; i--, oc++)
 516                 if (oc->_clk)
 517                         clk_disable_unprepare(oc->_clk);
 518
 519         r = (c == MAX_MODULE_SOFTRESET_WAIT) ? -ETIMEDOUT : 0;
 520
 521         return r;
 522 }