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 } 523