1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) STMicroelectronics SA 2014 4 * Author: Vincent Abriou <vincent.abriou@st.com> for STMicroelectronics. 5 */ 6 7 #include <linux/clk.h> 8 #include <linux/component.h> 9 #include <linux/debugfs.h> 10 #include <linux/module.h> 11 #include <linux/of_gpio.h> 12 #include <linux/platform_device.h> 13 14 #include <drm/drm_atomic_helper.h> 15 #include <drm/drm_bridge.h> 16 #include <drm/drm_device.h> 17 #include <drm/drm_panel.h> 18 #include <drm/drm_print.h> 19 #include <drm/drm_probe_helper.h> 20 21 #include "sti_awg_utils.h" 22 #include "sti_drv.h" 23 #include "sti_mixer.h" 24 25 /* DVO registers */ 26 #define DVO_AWG_DIGSYNC_CTRL 0x0000 27 #define DVO_DOF_CFG 0x0004 28 #define DVO_LUT_PROG_LOW 0x0008 29 #define DVO_LUT_PROG_MID 0x000C 30 #define DVO_LUT_PROG_HIGH 0x0010 31 #define DVO_DIGSYNC_INSTR_I 0x0100 32 33 #define DVO_AWG_CTRL_EN BIT(0) 34 #define DVO_AWG_FRAME_BASED_SYNC BIT(2) 35 36 #define DVO_DOF_EN_LOWBYTE BIT(0) 37 #define DVO_DOF_EN_MIDBYTE BIT(1) 38 #define DVO_DOF_EN_HIGHBYTE BIT(2) 39 #define DVO_DOF_EN BIT(6) 40 #define DVO_DOF_MOD_COUNT_SHIFT 8 41 42 #define DVO_LUT_ZERO 0 43 #define DVO_LUT_Y_G 1 44 #define DVO_LUT_Y_G_DEL 2 45 #define DVO_LUT_CB_B 3 46 #define DVO_LUT_CB_B_DEL 4 47 #define DVO_LUT_CR_R 5 48 #define DVO_LUT_CR_R_DEL 6 49 #define DVO_LUT_HOLD 7 50 51 struct dvo_config { 52 u32 flags; 53 u32 lowbyte; 54 u32 midbyte; 55 u32 highbyte; 56 int (*awg_fwgen_fct)( 57 struct awg_code_generation_params *fw_gen_params, 58 struct awg_timing *timing); 59 }; 60 61 static struct dvo_config rgb_24bit_de_cfg = { 62 .flags = (0L << DVO_DOF_MOD_COUNT_SHIFT), 63 .lowbyte = DVO_LUT_CR_R, 64 .midbyte = DVO_LUT_Y_G, 65 .highbyte = DVO_LUT_CB_B, 66 .awg_fwgen_fct = sti_awg_generate_code_data_enable_mode, 67 }; 68 69 /* 70 * STI digital video output structure 71 * 72 * @dev: driver device 73 * @drm_dev: pointer to drm device 74 * @mode: current display mode selected 75 * @regs: dvo registers 76 * @clk_pix: pixel clock for dvo 77 * @clk: clock for dvo 78 * @clk_main_parent: dvo parent clock if main path used 79 * @clk_aux_parent: dvo parent clock if aux path used 80 * @panel_node: panel node reference from device tree 81 * @panel: reference to the panel connected to the dvo 82 * @enabled: true if dvo is enabled else false 83 * @encoder: drm_encoder it is bound 84 */ 85 struct sti_dvo { 86 struct device dev; 87 struct drm_device *drm_dev; 88 struct drm_display_mode mode; 89 void __iomem *regs; 90 struct clk *clk_pix; 91 struct clk *clk; 92 struct clk *clk_main_parent; 93 struct clk *clk_aux_parent; 94 struct device_node *panel_node; 95 struct drm_panel *panel; 96 struct dvo_config *config; 97 bool enabled; 98 struct drm_encoder *encoder; 99 struct drm_bridge *bridge; 100 }; 101 102 struct sti_dvo_connector { 103 struct drm_connector drm_connector; 104 struct drm_encoder *encoder; 105 struct sti_dvo *dvo; 106 }; 107 108 #define to_sti_dvo_connector(x) \ 109 container_of(x, struct sti_dvo_connector, drm_connector) 110 111 #define BLANKING_LEVEL 16 112 static int dvo_awg_generate_code(struct sti_dvo *dvo, u8 *ram_size, u32 *ram_code) 113 { 114 struct drm_display_mode *mode = &dvo->mode; 115 struct dvo_config *config = dvo->config; 116 struct awg_code_generation_params fw_gen_params; 117 struct awg_timing timing; 118 119 fw_gen_params.ram_code = ram_code; 120 fw_gen_params.instruction_offset = 0; 121 122 timing.total_lines = mode->vtotal; 123 timing.active_lines = mode->vdisplay; 124 timing.blanking_lines = mode->vsync_start - mode->vdisplay; 125 timing.trailing_lines = mode->vtotal - mode->vsync_start; 126 timing.total_pixels = mode->htotal; 127 timing.active_pixels = mode->hdisplay; 128 timing.blanking_pixels = mode->hsync_start - mode->hdisplay; 129 timing.trailing_pixels = mode->htotal - mode->hsync_start; 130 timing.blanking_level = BLANKING_LEVEL; 131 132 if (config->awg_fwgen_fct(&fw_gen_params, &timing)) { 133 DRM_ERROR("AWG firmware not properly generated\n"); 134 return -EINVAL; 135 } 136 137 *ram_size = fw_gen_params.instruction_offset; 138 139 return 0; 140 } 141 142 /* Configure AWG, writing instructions 143 * 144 * @dvo: pointer to DVO structure 145 * @awg_ram_code: pointer to AWG instructions table 146 * @nb: nb of AWG instructions 147 */ 148 static void dvo_awg_configure(struct sti_dvo *dvo, u32 *awg_ram_code, int nb) 149 { 150 int i; 151 152 DRM_DEBUG_DRIVER("\n"); 153 154 for (i = 0; i < nb; i++) 155 writel(awg_ram_code[i], 156 dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4); 157 for (i = nb; i < AWG_MAX_INST; i++) 158 writel(0, dvo->regs + DVO_DIGSYNC_INSTR_I + i * 4); 159 160 writel(DVO_AWG_CTRL_EN, dvo->regs + DVO_AWG_DIGSYNC_CTRL); 161 } 162 163 #define DBGFS_DUMP(reg) seq_printf(s, "\n %-25s 0x%08X", #reg, \ 164 readl(dvo->regs + reg)) 165 166 static void dvo_dbg_awg_microcode(struct seq_file *s, void __iomem *reg) 167 { 168 unsigned int i; 169 170 seq_puts(s, "\n\n"); 171 seq_puts(s, " DVO AWG microcode:"); 172 for (i = 0; i < AWG_MAX_INST; i++) { 173 if (i % 8 == 0) 174 seq_printf(s, "\n %04X:", i); 175 seq_printf(s, " %04X", readl(reg + i * 4)); 176 } 177 } 178 179 static int dvo_dbg_show(struct seq_file *s, void *data) 180 { 181 struct drm_info_node *node = s->private; 182 struct sti_dvo *dvo = (struct sti_dvo *)node->info_ent->data; 183 184 seq_printf(s, "DVO: (vaddr = 0x%p)", dvo->regs); 185 DBGFS_DUMP(DVO_AWG_DIGSYNC_CTRL); 186 DBGFS_DUMP(DVO_DOF_CFG); 187 DBGFS_DUMP(DVO_LUT_PROG_LOW); 188 DBGFS_DUMP(DVO_LUT_PROG_MID); 189 DBGFS_DUMP(DVO_LUT_PROG_HIGH); 190 dvo_dbg_awg_microcode(s, dvo->regs + DVO_DIGSYNC_INSTR_I); 191 seq_putc(s, '\n'); 192 return 0; 193 } 194 195 static struct drm_info_list dvo_debugfs_files[] = { 196 { "dvo", dvo_dbg_show, 0, NULL }, 197 }; 198 199 static void dvo_debugfs_init(struct sti_dvo *dvo, struct drm_minor *minor) 200 { 201 unsigned int i; 202 203 for (i = 0; i < ARRAY_SIZE(dvo_debugfs_files); i++) 204 dvo_debugfs_files[i].data = dvo; 205 206 drm_debugfs_create_files(dvo_debugfs_files, 207 ARRAY_SIZE(dvo_debugfs_files), 208 minor->debugfs_root, minor); 209 } 210 211 static void sti_dvo_disable(struct drm_bridge *bridge) 212 { 213 struct sti_dvo *dvo = bridge->driver_private; 214 215 if (!dvo->enabled) 216 return; 217 218 DRM_DEBUG_DRIVER("\n"); 219 220 if (dvo->config->awg_fwgen_fct) 221 writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL); 222 223 writel(0x00000000, dvo->regs + DVO_DOF_CFG); 224 225 drm_panel_disable(dvo->panel); 226 227 /* Disable/unprepare dvo clock */ 228 clk_disable_unprepare(dvo->clk_pix); 229 clk_disable_unprepare(dvo->clk); 230 231 dvo->enabled = false; 232 } 233 234 static void sti_dvo_pre_enable(struct drm_bridge *bridge) 235 { 236 struct sti_dvo *dvo = bridge->driver_private; 237 struct dvo_config *config = dvo->config; 238 u32 val; 239 240 DRM_DEBUG_DRIVER("\n"); 241 242 if (dvo->enabled) 243 return; 244 245 /* Make sure DVO is disabled */ 246 writel(0x00000000, dvo->regs + DVO_DOF_CFG); 247 writel(0x00000000, dvo->regs + DVO_AWG_DIGSYNC_CTRL); 248 249 if (config->awg_fwgen_fct) { 250 u8 nb_instr; 251 u32 awg_ram_code[AWG_MAX_INST]; 252 /* Configure AWG */ 253 if (!dvo_awg_generate_code(dvo, &nb_instr, awg_ram_code)) 254 dvo_awg_configure(dvo, awg_ram_code, nb_instr); 255 else 256 return; 257 } 258 259 /* Prepare/enable clocks */ 260 if (clk_prepare_enable(dvo->clk_pix)) 261 DRM_ERROR("Failed to prepare/enable dvo_pix clk\n"); 262 if (clk_prepare_enable(dvo->clk)) 263 DRM_ERROR("Failed to prepare/enable dvo clk\n"); 264 265 drm_panel_enable(dvo->panel); 266 267 /* Set LUT */ 268 writel(config->lowbyte, dvo->regs + DVO_LUT_PROG_LOW); 269 writel(config->midbyte, dvo->regs + DVO_LUT_PROG_MID); 270 writel(config->highbyte, dvo->regs + DVO_LUT_PROG_HIGH); 271 272 /* Digital output formatter config */ 273 val = (config->flags | DVO_DOF_EN); 274 writel(val, dvo->regs + DVO_DOF_CFG); 275 276 dvo->enabled = true; 277 } 278 279 static void sti_dvo_set_mode(struct drm_bridge *bridge, 280 const struct drm_display_mode *mode, 281 const struct drm_display_mode *adjusted_mode) 282 { 283 struct sti_dvo *dvo = bridge->driver_private; 284 struct sti_mixer *mixer = to_sti_mixer(dvo->encoder->crtc); 285 int rate = mode->clock * 1000; 286 struct clk *clkp; 287 int ret; 288 289 DRM_DEBUG_DRIVER("\n"); 290 291 memcpy(&dvo->mode, mode, sizeof(struct drm_display_mode)); 292 293 /* According to the path used (main or aux), the dvo clocks should 294 * have a different parent clock. */ 295 if (mixer->id == STI_MIXER_MAIN) 296 clkp = dvo->clk_main_parent; 297 else 298 clkp = dvo->clk_aux_parent; 299 300 if (clkp) { 301 clk_set_parent(dvo->clk_pix, clkp); 302 clk_set_parent(dvo->clk, clkp); 303 } 304 305 /* DVO clocks = compositor clock */ 306 ret = clk_set_rate(dvo->clk_pix, rate); 307 if (ret < 0) { 308 DRM_ERROR("Cannot set rate (%dHz) for dvo_pix clk\n", rate); 309 return; 310 } 311 312 ret = clk_set_rate(dvo->clk, rate); 313 if (ret < 0) { 314 DRM_ERROR("Cannot set rate (%dHz) for dvo clk\n", rate); 315 return; 316 } 317 318 /* For now, we only support 24bit data enable (DE) synchro format */ 319 dvo->config = &rgb_24bit_de_cfg; 320 } 321 322 static void sti_dvo_bridge_nope(struct drm_bridge *bridge) 323 { 324 /* do nothing */ 325 } 326 327 static const struct drm_bridge_funcs sti_dvo_bridge_funcs = { 328 .pre_enable = sti_dvo_pre_enable, 329 .enable = sti_dvo_bridge_nope, 330 .disable = sti_dvo_disable, 331 .post_disable = sti_dvo_bridge_nope, 332 .mode_set = sti_dvo_set_mode, 333 }; 334 335 static int sti_dvo_connector_get_modes(struct drm_connector *connector) 336 { 337 struct sti_dvo_connector *dvo_connector 338 = to_sti_dvo_connector(connector); 339 struct sti_dvo *dvo = dvo_connector->dvo; 340 341 if (dvo->panel) 342 return drm_panel_get_modes(dvo->panel, connector); 343 344 return 0; 345 } 346 347 #define CLK_TOLERANCE_HZ 50 348 349 static int sti_dvo_connector_mode_valid(struct drm_connector *connector, 350 struct drm_display_mode *mode) 351 { 352 int target = mode->clock * 1000; 353 int target_min = target - CLK_TOLERANCE_HZ; 354 int target_max = target + CLK_TOLERANCE_HZ; 355 int result; 356 struct sti_dvo_connector *dvo_connector 357 = to_sti_dvo_connector(connector); 358 struct sti_dvo *dvo = dvo_connector->dvo; 359 360 result = clk_round_rate(dvo->clk_pix, target); 361 362 DRM_DEBUG_DRIVER("target rate = %d => available rate = %d\n", 363 target, result); 364 365 if ((result < target_min) || (result > target_max)) { 366 DRM_DEBUG_DRIVER("dvo pixclk=%d not supported\n", target); 367 return MODE_BAD; 368 } 369 370 return MODE_OK; 371 } 372 373 static const 374 struct drm_connector_helper_funcs sti_dvo_connector_helper_funcs = { 375 .get_modes = sti_dvo_connector_get_modes, 376 .mode_valid = sti_dvo_connector_mode_valid, 377 }; 378 379 static enum drm_connector_status 380 sti_dvo_connector_detect(struct drm_connector *connector, bool force) 381 { 382 struct sti_dvo_connector *dvo_connector 383 = to_sti_dvo_connector(connector); 384 struct sti_dvo *dvo = dvo_connector->dvo; 385 386 DRM_DEBUG_DRIVER("\n"); 387 388 if (!dvo->panel) { 389 dvo->panel = of_drm_find_panel(dvo->panel_node); 390 if (IS_ERR(dvo->panel)) 391 dvo->panel = NULL; 392 } 393 394 if (dvo->panel) 395 return connector_status_connected; 396 397 return connector_status_disconnected; 398 } 399 400 static int sti_dvo_late_register(struct drm_connector *connector) 401 { 402 struct sti_dvo_connector *dvo_connector 403 = to_sti_dvo_connector(connector); 404 struct sti_dvo *dvo = dvo_connector->dvo; 405 406 dvo_debugfs_init(dvo, dvo->drm_dev->primary); 407 408 return 0; 409 } 410 411 static const struct drm_connector_funcs sti_dvo_connector_funcs = { 412 .fill_modes = drm_helper_probe_single_connector_modes, 413 .detect = sti_dvo_connector_detect, 414 .destroy = drm_connector_cleanup, 415 .reset = drm_atomic_helper_connector_reset, 416 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, 417 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, 418 .late_register = sti_dvo_late_register, 419 }; 420 421 static struct drm_encoder *sti_dvo_find_encoder(struct drm_device *dev) 422 { 423 struct drm_encoder *encoder; 424 425 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) { 426 if (encoder->encoder_type == DRM_MODE_ENCODER_LVDS) 427 return encoder; 428 } 429 430 return NULL; 431 } 432 433 static int sti_dvo_bind(struct device *dev, struct device *master, void *data) 434 { 435 struct sti_dvo *dvo = dev_get_drvdata(dev); 436 struct drm_device *drm_dev = data; 437 struct drm_encoder *encoder; 438 struct sti_dvo_connector *connector; 439 struct drm_connector *drm_connector; 440 struct drm_bridge *bridge; 441 int err; 442 443 /* Set the drm device handle */ 444 dvo->drm_dev = drm_dev; 445 446 encoder = sti_dvo_find_encoder(drm_dev); 447 if (!encoder) 448 return -ENOMEM; 449 450 connector = devm_kzalloc(dev, sizeof(*connector), GFP_KERNEL); 451 if (!connector) 452 return -ENOMEM; 453 454 connector->dvo = dvo; 455 456 bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL); 457 if (!bridge) 458 return -ENOMEM; 459 460 bridge->driver_private = dvo; 461 bridge->funcs = &sti_dvo_bridge_funcs; 462 bridge->of_node = dvo->dev.of_node; 463 drm_bridge_add(bridge); 464 465 err = drm_bridge_attach(encoder, bridge, NULL, 0); 466 if (err) { 467 DRM_ERROR("Failed to attach bridge\n"); 468 return err; 469 } 470 471 dvo->bridge = bridge; 472 connector->encoder = encoder; 473 dvo->encoder = encoder; 474 475 drm_connector = (struct drm_connector *)connector; 476 477 drm_connector->polled = DRM_CONNECTOR_POLL_HPD; 478 479 drm_connector_init(drm_dev, drm_connector, 480 &sti_dvo_connector_funcs, DRM_MODE_CONNECTOR_LVDS); 481 drm_connector_helper_add(drm_connector, 482 &sti_dvo_connector_helper_funcs); 483 484 err = drm_connector_attach_encoder(drm_connector, encoder); 485 if (err) { 486 DRM_ERROR("Failed to attach a connector to a encoder\n"); 487 goto err_sysfs; 488 } 489 490 return 0; 491 492 err_sysfs: 493 drm_bridge_remove(bridge); 494 return -EINVAL; 495 } 496 497 static void sti_dvo_unbind(struct device *dev, 498 struct device *master, void *data) 499 { 500 struct sti_dvo *dvo = dev_get_drvdata(dev); 501 502 drm_bridge_remove(dvo->bridge); 503 } 504 505 static const struct component_ops sti_dvo_ops = { 506 .bind = sti_dvo_bind, 507 .unbind = sti_dvo_unbind, 508 }; 509 510 static int sti_dvo_probe(struct platform_device *pdev) 511 { 512 struct device *dev = &pdev->dev; 513 struct sti_dvo *dvo; 514 struct resource *res; 515 struct device_node *np = dev->of_node; 516 517 DRM_INFO("%s\n", __func__); 518 519 dvo = devm_kzalloc(dev, sizeof(*dvo), GFP_KERNEL); 520 if (!dvo) { 521 DRM_ERROR("Failed to allocate memory for DVO\n"); 522 return -ENOMEM; 523 } 524 525 dvo->dev = pdev->dev; 526 527 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dvo-reg"); 528 if (!res) { 529 DRM_ERROR("Invalid dvo resource\n"); 530 return -ENOMEM; 531 } 532 dvo->regs = devm_ioremap(dev, res->start, 533 resource_size(res)); 534 if (!dvo->regs) 535 return -ENOMEM; 536 537 dvo->clk_pix = devm_clk_get(dev, "dvo_pix"); 538 if (IS_ERR(dvo->clk_pix)) { 539 DRM_ERROR("Cannot get dvo_pix clock\n"); 540 return PTR_ERR(dvo->clk_pix); 541 } 542 543 dvo->clk = devm_clk_get(dev, "dvo"); 544 if (IS_ERR(dvo->clk)) { 545 DRM_ERROR("Cannot get dvo clock\n"); 546 return PTR_ERR(dvo->clk); 547 } 548 549 dvo->clk_main_parent = devm_clk_get(dev, "main_parent"); 550 if (IS_ERR(dvo->clk_main_parent)) { 551 DRM_DEBUG_DRIVER("Cannot get main_parent clock\n"); 552 dvo->clk_main_parent = NULL; 553 } 554 555 dvo->clk_aux_parent = devm_clk_get(dev, "aux_parent"); 556 if (IS_ERR(dvo->clk_aux_parent)) { 557 DRM_DEBUG_DRIVER("Cannot get aux_parent clock\n"); 558 dvo->clk_aux_parent = NULL; 559 } 560 561 dvo->panel_node = of_parse_phandle(np, "sti,panel", 0); 562 if (!dvo->panel_node) 563 DRM_ERROR("No panel associated to the dvo output\n"); 564 of_node_put(dvo->panel_node); 565 566 platform_set_drvdata(pdev, dvo); 567 568 return component_add(&pdev->dev, &sti_dvo_ops); 569 } 570 571 static int sti_dvo_remove(struct platform_device *pdev) 572 { 573 component_del(&pdev->dev, &sti_dvo_ops); 574 return 0; 575 } 576 577 static const struct of_device_id dvo_of_match[] = { 578 { .compatible = "st,stih407-dvo", }, 579 { /* end node */ } 580 }; 581 MODULE_DEVICE_TABLE(of, dvo_of_match); 582 583 struct platform_driver sti_dvo_driver = { 584 .driver = { 585 .name = "sti-dvo", 586 .owner = THIS_MODULE, 587 .of_match_table = dvo_of_match, 588 }, 589 .probe = sti_dvo_probe, 590 .remove = sti_dvo_remove, 591 }; 592 593 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); 594 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); 595 MODULE_LICENSE("GPL"); 596