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_resume_and_get(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 };