1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2015 Samsung Electronics Co.Ltd 4 * Authors: 5 * Hyungwon Hwang <human.hwang@samsung.com> 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/component.h> 10 #include <linux/delay.h> 11 #include <linux/mfd/syscon.h> 12 #include <linux/module.h> 13 #include <linux/mutex.h> 14 #include <linux/of.h> 15 #include <linux/of_address.h> 16 #include <linux/of_graph.h> 17 #include <linux/platform_device.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/regmap.h> 20 21 #include <video/of_videomode.h> 22 #include <video/videomode.h> 23 24 #include <drm/drm_bridge.h> 25 #include <drm/drm_encoder.h> 26 #include <drm/drm_print.h> 27 28 #include "exynos_drm_drv.h" 29 30 /* Sysreg registers for MIC */ 31 #define DSD_CFG_MUX 0x1004 32 #define MIC0_RGB_MUX (1 << 0) 33 #define MIC0_I80_MUX (1 << 1) 34 #define MIC0_ON_MUX (1 << 5) 35 36 /* MIC registers */ 37 #define MIC_OP 0x0 38 #define MIC_IP_VER 0x0004 39 #define MIC_V_TIMING_0 0x0008 40 #define MIC_V_TIMING_1 0x000C 41 #define MIC_IMG_SIZE 0x0010 42 #define MIC_INPUT_TIMING_0 0x0014 43 #define MIC_INPUT_TIMING_1 0x0018 44 #define MIC_2D_OUTPUT_TIMING_0 0x001C 45 #define MIC_2D_OUTPUT_TIMING_1 0x0020 46 #define MIC_2D_OUTPUT_TIMING_2 0x0024 47 #define MIC_3D_OUTPUT_TIMING_0 0x0028 48 #define MIC_3D_OUTPUT_TIMING_1 0x002C 49 #define MIC_3D_OUTPUT_TIMING_2 0x0030 50 #define MIC_CORE_PARA_0 0x0034 51 #define MIC_CORE_PARA_1 0x0038 52 #define MIC_CTC_CTRL 0x0040 53 #define MIC_RD_DATA 0x0044 54 55 #define MIC_UPD_REG (1 << 31) 56 #define MIC_ON_REG (1 << 30) 57 #define MIC_TD_ON_REG (1 << 29) 58 #define MIC_BS_CHG_OUT (1 << 16) 59 #define MIC_VIDEO_TYPE(x) (((x) & 0xf) << 12) 60 #define MIC_PSR_EN (1 << 5) 61 #define MIC_SW_RST (1 << 4) 62 #define MIC_ALL_RST (1 << 3) 63 #define MIC_CORE_VER_CONTROL (1 << 2) 64 #define MIC_MODE_SEL_COMMAND_MODE (1 << 1) 65 #define MIC_MODE_SEL_MASK (1 << 1) 66 #define MIC_CORE_EN (1 << 0) 67 68 #define MIC_V_PULSE_WIDTH(x) (((x) & 0x3fff) << 16) 69 #define MIC_V_PERIOD_LINE(x) ((x) & 0x3fff) 70 71 #define MIC_VBP_SIZE(x) (((x) & 0x3fff) << 16) 72 #define MIC_VFP_SIZE(x) ((x) & 0x3fff) 73 74 #define MIC_IMG_V_SIZE(x) (((x) & 0x3fff) << 16) 75 #define MIC_IMG_H_SIZE(x) ((x) & 0x3fff) 76 77 #define MIC_H_PULSE_WIDTH_IN(x) (((x) & 0x3fff) << 16) 78 #define MIC_H_PERIOD_PIXEL_IN(x) ((x) & 0x3fff) 79 80 #define MIC_HBP_SIZE_IN(x) (((x) & 0x3fff) << 16) 81 #define MIC_HFP_SIZE_IN(x) ((x) & 0x3fff) 82 83 #define MIC_H_PULSE_WIDTH_2D(x) (((x) & 0x3fff) << 16) 84 #define MIC_H_PERIOD_PIXEL_2D(x) ((x) & 0x3fff) 85 86 #define MIC_HBP_SIZE_2D(x) (((x) & 0x3fff) << 16) 87 #define MIC_HFP_SIZE_2D(x) ((x) & 0x3fff) 88 89 #define MIC_BS_SIZE_2D(x) ((x) & 0x3fff) 90 91 static char *clk_names[] = { "pclk_mic0", "sclk_rgb_vclk_to_mic0" }; 92 #define NUM_CLKS ARRAY_SIZE(clk_names) 93 static DEFINE_MUTEX(mic_mutex); 94 95 struct exynos_mic { 96 struct device *dev; 97 void __iomem *reg; 98 struct regmap *sysreg; 99 struct clk *clks[NUM_CLKS]; 100 101 bool i80_mode; 102 struct videomode vm; 103 struct drm_encoder *encoder; 104 struct drm_bridge bridge; 105 106 bool enabled; 107 }; 108 109 static void mic_set_path(struct exynos_mic *mic, bool enable) 110 { 111 int ret; 112 unsigned int val; 113 114 ret = regmap_read(mic->sysreg, DSD_CFG_MUX, &val); 115 if (ret) { 116 DRM_DEV_ERROR(mic->dev, 117 "mic: Failed to read system register\n"); 118 return; 119 } 120 121 if (enable) { 122 if (mic->i80_mode) 123 val |= MIC0_I80_MUX; 124 else 125 val |= MIC0_RGB_MUX; 126 127 val |= MIC0_ON_MUX; 128 } else 129 val &= ~(MIC0_RGB_MUX | MIC0_I80_MUX | MIC0_ON_MUX); 130 131 ret = regmap_write(mic->sysreg, DSD_CFG_MUX, val); 132 if (ret) 133 DRM_DEV_ERROR(mic->dev, 134 "mic: Failed to read system register\n"); 135 } 136 137 static int mic_sw_reset(struct exynos_mic *mic) 138 { 139 unsigned int retry = 100; 140 int ret; 141 142 writel(MIC_SW_RST, mic->reg + MIC_OP); 143 144 while (retry-- > 0) { 145 ret = readl(mic->reg + MIC_OP); 146 if (!(ret & MIC_SW_RST)) 147 return 0; 148 149 udelay(10); 150 } 151 152 return -ETIMEDOUT; 153 } 154 155 static void mic_set_porch_timing(struct exynos_mic *mic) 156 { 157 struct videomode vm = mic->vm; 158 u32 reg; 159 160 reg = MIC_V_PULSE_WIDTH(vm.vsync_len) + 161 MIC_V_PERIOD_LINE(vm.vsync_len + vm.vactive + 162 vm.vback_porch + vm.vfront_porch); 163 writel(reg, mic->reg + MIC_V_TIMING_0); 164 165 reg = MIC_VBP_SIZE(vm.vback_porch) + 166 MIC_VFP_SIZE(vm.vfront_porch); 167 writel(reg, mic->reg + MIC_V_TIMING_1); 168 169 reg = MIC_V_PULSE_WIDTH(vm.hsync_len) + 170 MIC_V_PERIOD_LINE(vm.hsync_len + vm.hactive + 171 vm.hback_porch + vm.hfront_porch); 172 writel(reg, mic->reg + MIC_INPUT_TIMING_0); 173 174 reg = MIC_VBP_SIZE(vm.hback_porch) + 175 MIC_VFP_SIZE(vm.hfront_porch); 176 writel(reg, mic->reg + MIC_INPUT_TIMING_1); 177 } 178 179 static void mic_set_img_size(struct exynos_mic *mic) 180 { 181 struct videomode *vm = &mic->vm; 182 u32 reg; 183 184 reg = MIC_IMG_H_SIZE(vm->hactive) + 185 MIC_IMG_V_SIZE(vm->vactive); 186 187 writel(reg, mic->reg + MIC_IMG_SIZE); 188 } 189 190 static void mic_set_output_timing(struct exynos_mic *mic) 191 { 192 struct videomode vm = mic->vm; 193 u32 reg, bs_size_2d; 194 195 DRM_DEV_DEBUG(mic->dev, "w: %u, h: %u\n", vm.hactive, vm.vactive); 196 bs_size_2d = ((vm.hactive >> 2) << 1) + (vm.vactive % 4); 197 reg = MIC_BS_SIZE_2D(bs_size_2d); 198 writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_2); 199 200 if (!mic->i80_mode) { 201 reg = MIC_H_PULSE_WIDTH_2D(vm.hsync_len) + 202 MIC_H_PERIOD_PIXEL_2D(vm.hsync_len + bs_size_2d + 203 vm.hback_porch + vm.hfront_porch); 204 writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_0); 205 206 reg = MIC_HBP_SIZE_2D(vm.hback_porch) + 207 MIC_H_PERIOD_PIXEL_2D(vm.hfront_porch); 208 writel(reg, mic->reg + MIC_2D_OUTPUT_TIMING_1); 209 } 210 } 211 212 static void mic_set_reg_on(struct exynos_mic *mic, bool enable) 213 { 214 u32 reg = readl(mic->reg + MIC_OP); 215 216 if (enable) { 217 reg &= ~(MIC_MODE_SEL_MASK | MIC_CORE_VER_CONTROL | MIC_PSR_EN); 218 reg |= (MIC_CORE_EN | MIC_BS_CHG_OUT | MIC_ON_REG); 219 220 reg &= ~MIC_MODE_SEL_COMMAND_MODE; 221 if (mic->i80_mode) 222 reg |= MIC_MODE_SEL_COMMAND_MODE; 223 } else { 224 reg &= ~MIC_CORE_EN; 225 } 226 227 reg |= MIC_UPD_REG; 228 writel(reg, mic->reg + MIC_OP); 229 } 230 231 static void mic_disable(struct drm_bridge *bridge) { } 232 233 static void mic_post_disable(struct drm_bridge *bridge) 234 { 235 struct exynos_mic *mic = bridge->driver_private; 236 237 mutex_lock(&mic_mutex); 238 if (!mic->enabled) 239 goto already_disabled; 240 241 mic_set_path(mic, 0); 242 243 pm_runtime_put(mic->dev); 244 mic->enabled = 0; 245 246 already_disabled: 247 mutex_unlock(&mic_mutex); 248 } 249 250 static void mic_mode_set(struct drm_bridge *bridge, 251 const struct drm_display_mode *mode, 252 const struct drm_display_mode *adjusted_mode) 253 { 254 struct exynos_mic *mic = bridge->driver_private; 255 256 mutex_lock(&mic_mutex); 257 drm_display_mode_to_videomode(mode, &mic->vm); 258 mic->i80_mode = to_exynos_crtc(bridge->encoder->crtc)->i80_mode; 259 mutex_unlock(&mic_mutex); 260 } 261 262 static void mic_pre_enable(struct drm_bridge *bridge) 263 { 264 struct exynos_mic *mic = bridge->driver_private; 265 int ret; 266 267 mutex_lock(&mic_mutex); 268 if (mic->enabled) 269 goto unlock; 270 271 ret = pm_runtime_get_sync(mic->dev); 272 if (ret < 0) 273 goto unlock; 274 275 mic_set_path(mic, 1); 276 277 ret = mic_sw_reset(mic); 278 if (ret) { 279 DRM_DEV_ERROR(mic->dev, "Failed to reset\n"); 280 goto turn_off; 281 } 282 283 if (!mic->i80_mode) 284 mic_set_porch_timing(mic); 285 mic_set_img_size(mic); 286 mic_set_output_timing(mic); 287 mic_set_reg_on(mic, 1); 288 mic->enabled = 1; 289 mutex_unlock(&mic_mutex); 290 291 return; 292 293 turn_off: 294 pm_runtime_put(mic->dev); 295 unlock: 296 mutex_unlock(&mic_mutex); 297 } 298 299 static void mic_enable(struct drm_bridge *bridge) { } 300 301 static const struct drm_bridge_funcs mic_bridge_funcs = { 302 .disable = mic_disable, 303 .post_disable = mic_post_disable, 304 .mode_set = mic_mode_set, 305 .pre_enable = mic_pre_enable, 306 .enable = mic_enable, 307 }; 308 309 static int exynos_mic_bind(struct device *dev, struct device *master, 310 void *data) 311 { 312 struct exynos_mic *mic = dev_get_drvdata(dev); 313 314 mic->bridge.driver_private = mic; 315 316 return 0; 317 } 318 319 static void exynos_mic_unbind(struct device *dev, struct device *master, 320 void *data) 321 { 322 struct exynos_mic *mic = dev_get_drvdata(dev); 323 324 mutex_lock(&mic_mutex); 325 if (!mic->enabled) 326 goto already_disabled; 327 328 pm_runtime_put(mic->dev); 329 330 already_disabled: 331 mutex_unlock(&mic_mutex); 332 } 333 334 static const struct component_ops exynos_mic_component_ops = { 335 .bind = exynos_mic_bind, 336 .unbind = exynos_mic_unbind, 337 }; 338 339 #ifdef CONFIG_PM 340 static int exynos_mic_suspend(struct device *dev) 341 { 342 struct exynos_mic *mic = dev_get_drvdata(dev); 343 int i; 344 345 for (i = NUM_CLKS - 1; i > -1; i--) 346 clk_disable_unprepare(mic->clks[i]); 347 348 return 0; 349 } 350 351 static int exynos_mic_resume(struct device *dev) 352 { 353 struct exynos_mic *mic = dev_get_drvdata(dev); 354 int ret, i; 355 356 for (i = 0; i < NUM_CLKS; i++) { 357 ret = clk_prepare_enable(mic->clks[i]); 358 if (ret < 0) { 359 DRM_DEV_ERROR(dev, "Failed to enable clock (%s)\n", 360 clk_names[i]); 361 while (--i > -1) 362 clk_disable_unprepare(mic->clks[i]); 363 return ret; 364 } 365 } 366 return 0; 367 } 368 #endif 369 370 static const struct dev_pm_ops exynos_mic_pm_ops = { 371 SET_RUNTIME_PM_OPS(exynos_mic_suspend, exynos_mic_resume, NULL) 372 SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend, 373 pm_runtime_force_resume) 374 }; 375 376 static int exynos_mic_probe(struct platform_device *pdev) 377 { 378 struct device *dev = &pdev->dev; 379 struct exynos_mic *mic; 380 struct resource res; 381 int ret, i; 382 383 mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL); 384 if (!mic) { 385 DRM_DEV_ERROR(dev, 386 "mic: Failed to allocate memory for MIC object\n"); 387 ret = -ENOMEM; 388 goto err; 389 } 390 391 mic->dev = dev; 392 393 ret = of_address_to_resource(dev->of_node, 0, &res); 394 if (ret) { 395 DRM_DEV_ERROR(dev, "mic: Failed to get mem region for MIC\n"); 396 goto err; 397 } 398 mic->reg = devm_ioremap(dev, res.start, resource_size(&res)); 399 if (!mic->reg) { 400 DRM_DEV_ERROR(dev, "mic: Failed to remap for MIC\n"); 401 ret = -ENOMEM; 402 goto err; 403 } 404 405 mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node, 406 "samsung,disp-syscon"); 407 if (IS_ERR(mic->sysreg)) { 408 DRM_DEV_ERROR(dev, "mic: Failed to get system register.\n"); 409 ret = PTR_ERR(mic->sysreg); 410 goto err; 411 } 412 413 for (i = 0; i < NUM_CLKS; i++) { 414 mic->clks[i] = devm_clk_get(dev, clk_names[i]); 415 if (IS_ERR(mic->clks[i])) { 416 DRM_DEV_ERROR(dev, "mic: Failed to get clock (%s)\n", 417 clk_names[i]); 418 ret = PTR_ERR(mic->clks[i]); 419 goto err; 420 } 421 } 422 423 platform_set_drvdata(pdev, mic); 424 425 mic->bridge.funcs = &mic_bridge_funcs; 426 mic->bridge.of_node = dev->of_node; 427 428 drm_bridge_add(&mic->bridge); 429 430 pm_runtime_enable(dev); 431 432 ret = component_add(dev, &exynos_mic_component_ops); 433 if (ret) 434 goto err_pm; 435 436 DRM_DEV_DEBUG_KMS(dev, "MIC has been probed\n"); 437 438 return 0; 439 440 err_pm: 441 pm_runtime_disable(dev); 442 err: 443 return ret; 444 } 445 446 static int exynos_mic_remove(struct platform_device *pdev) 447 { 448 struct exynos_mic *mic = platform_get_drvdata(pdev); 449 450 component_del(&pdev->dev, &exynos_mic_component_ops); 451 pm_runtime_disable(&pdev->dev); 452 453 drm_bridge_remove(&mic->bridge); 454 455 return 0; 456 } 457 458 static const struct of_device_id exynos_mic_of_match[] = { 459 { .compatible = "samsung,exynos5433-mic" }, 460 { } 461 }; 462 MODULE_DEVICE_TABLE(of, exynos_mic_of_match); 463 464 struct platform_driver mic_driver = { 465 .probe = exynos_mic_probe, 466 .remove = exynos_mic_remove, 467 .driver = { 468 .name = "exynos-mic", 469 .pm = &exynos_mic_pm_ops, 470 .owner = THIS_MODULE, 471 .of_match_table = exynos_mic_of_match, 472 }, 473 }; 474