drivers/gpu/drm/exynos/exynos_drm_mic.c

   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 const char *const 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                 pm_runtime_put_noidle(mic->dev);
 274                 goto unlock;
 275         }
 276
 277         mic_set_path(mic, 1);
 278
 279         ret = mic_sw_reset(mic);
 280         if (ret) {
 281                 DRM_DEV_ERROR(mic->dev, "Failed to reset\n");
 282                 goto turn_off;
 283         }
 284
 285         if (!mic->i80_mode)
 286                 mic_set_porch_timing(mic);
 287         mic_set_img_size(mic);
 288         mic_set_output_timing(mic);
 289         mic_set_reg_on(mic, 1);
 290         mic->enabled = 1;
 291         mutex_unlock(&mic_mutex);
 292
 293         return;
 294
 295 turn_off:
 296         pm_runtime_put(mic->dev);
 297 unlock:
 298         mutex_unlock(&mic_mutex);
 299 }
 300
 301 static void mic_enable(struct drm_bridge *bridge) { }
 302
 303 static const struct drm_bridge_funcs mic_bridge_funcs = {
 304         .disable = mic_disable,
 305         .post_disable = mic_post_disable,
 306         .mode_set = mic_mode_set,
 307         .pre_enable = mic_pre_enable,
 308         .enable = mic_enable,
 309 };
 310
 311 static int exynos_mic_bind(struct device *dev, struct device *master,
 312                            void *data)
 313 {
 314         struct exynos_mic *mic = dev_get_drvdata(dev);
 315
 316         mic->bridge.driver_private = mic;
 317
 318         return 0;
 319 }
 320
 321 static void exynos_mic_unbind(struct device *dev, struct device *master,
 322                               void *data)
 323 {
 324         struct exynos_mic *mic = dev_get_drvdata(dev);
 325
 326         mutex_lock(&mic_mutex);
 327         if (!mic->enabled)
 328                 goto already_disabled;
 329
 330         pm_runtime_put(mic->dev);
 331
 332 already_disabled:
 333         mutex_unlock(&mic_mutex);
 334 }
 335
 336 static const struct component_ops exynos_mic_component_ops = {
 337         .bind   = exynos_mic_bind,
 338         .unbind = exynos_mic_unbind,
 339 };
 340
 341 #ifdef CONFIG_PM
 342 static int exynos_mic_suspend(struct device *dev)
 343 {
 344         struct exynos_mic *mic = dev_get_drvdata(dev);
 345         int i;
 346
 347         for (i = NUM_CLKS - 1; i > -1; i--)
 348                 clk_disable_unprepare(mic->clks[i]);
 349
 350         return 0;
 351 }
 352
 353 static int exynos_mic_resume(struct device *dev)
 354 {
 355         struct exynos_mic *mic = dev_get_drvdata(dev);
 356         int ret, i;
 357
 358         for (i = 0; i < NUM_CLKS; i++) {
 359                 ret = clk_prepare_enable(mic->clks[i]);
 360                 if (ret < 0) {
 361                         DRM_DEV_ERROR(dev, "Failed to enable clock (%s)\n",
 362                                       clk_names[i]);
 363                         while (--i > -1)
 364                                 clk_disable_unprepare(mic->clks[i]);
 365                         return ret;
 366                 }
 367         }
 368         return 0;
 369 }
 370 #endif
 371
 372 static const struct dev_pm_ops exynos_mic_pm_ops = {
 373         SET_RUNTIME_PM_OPS(exynos_mic_suspend, exynos_mic_resume, NULL)
 374         SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 375                                 pm_runtime_force_resume)
 376 };
 377
 378 static int exynos_mic_probe(struct platform_device *pdev)
 379 {
 380         struct device *dev = &pdev->dev;
 381         struct exynos_mic *mic;
 382         struct resource res;
 383         int ret, i;
 384
 385         mic = devm_kzalloc(dev, sizeof(*mic), GFP_KERNEL);
 386         if (!mic) {
 387                 DRM_DEV_ERROR(dev,
 388                               "mic: Failed to allocate memory for MIC object\n");
 389                 ret = -ENOMEM;
 390                 goto err;
 391         }
 392
 393         mic->dev = dev;
 394
 395         ret = of_address_to_resource(dev->of_node, 0, &res);
 396         if (ret) {
 397                 DRM_DEV_ERROR(dev, "mic: Failed to get mem region for MIC\n");
 398                 goto err;
 399         }
 400         mic->reg = devm_ioremap(dev, res.start, resource_size(&res));
 401         if (!mic->reg) {
 402                 DRM_DEV_ERROR(dev, "mic: Failed to remap for MIC\n");
 403                 ret = -ENOMEM;
 404                 goto err;
 405         }
 406
 407         mic->sysreg = syscon_regmap_lookup_by_phandle(dev->of_node,
 408                                                         "samsung,disp-syscon");
 409         if (IS_ERR(mic->sysreg)) {
 410                 DRM_DEV_ERROR(dev, "mic: Failed to get system register.\n");
 411                 ret = PTR_ERR(mic->sysreg);
 412                 goto err;
 413         }
 414
 415         for (i = 0; i < NUM_CLKS; i++) {
 416                 mic->clks[i] = devm_clk_get(dev, clk_names[i]);
 417                 if (IS_ERR(mic->clks[i])) {
 418                         DRM_DEV_ERROR(dev, "mic: Failed to get clock (%s)\n",
 419                                       clk_names[i]);
 420                         ret = PTR_ERR(mic->clks[i]);
 421                         goto err;
 422                 }
 423         }
 424
 425         platform_set_drvdata(pdev, mic);
 426
 427         mic->bridge.funcs = &mic_bridge_funcs;
 428         mic->bridge.of_node = dev->of_node;
 429
 430         drm_bridge_add(&mic->bridge);
 431
 432         pm_runtime_enable(dev);
 433
 434         ret = component_add(dev, &exynos_mic_component_ops);
 435         if (ret)
 436                 goto err_pm;
 437
 438         DRM_DEV_DEBUG_KMS(dev, "MIC has been probed\n");
 439
 440         return 0;
 441
 442 err_pm:
 443         pm_runtime_disable(dev);
 444 err:
 445         return ret;
 446 }
 447
 448 static int exynos_mic_remove(struct platform_device *pdev)
 449 {
 450         struct exynos_mic *mic = platform_get_drvdata(pdev);
 451
 452         component_del(&pdev->dev, &exynos_mic_component_ops);
 453         pm_runtime_disable(&pdev->dev);
 454
 455         drm_bridge_remove(&mic->bridge);
 456
 457         return 0;
 458 }
 459
 460 static const struct of_device_id exynos_mic_of_match[] = {
 461         { .compatible = "samsung,exynos5433-mic" },
 462         { }
 463 };
 464 MODULE_DEVICE_TABLE(of, exynos_mic_of_match);
 465
 466 struct platform_driver mic_driver = {
 467         .probe          = exynos_mic_probe,
 468         .remove         = exynos_mic_remove,
 469         .driver         = {
 470                 .name   = "exynos-mic",
 471                 .pm     = &exynos_mic_pm_ops,
 472                 .owner  = THIS_MODULE,
 473                 .of_match_table = exynos_mic_of_match,
 474         },
 475 };