kernel/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c

   1 /*
   2  * Copyright 2015 Freescale Semiconductor, Inc.
   3  *
   4  * Freescale DCU drm device driver
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/clk-provider.h>
  14 #include <linux/io.h>
  15 #include <linux/mfd/syscon.h>
  16 #include <linux/mm.h>
  17 #include <linux/module.h>
  18 #include <linux/of_platform.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/pm.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/regmap.h>
  23
  24 #include <drm/drmP.h>
  25 #include <drm/drm_crtc_helper.h>
  26 #include <drm/drm_gem_cma_helper.h>
  27
  28 #include "fsl_dcu_drm_crtc.h"
  29 #include "fsl_dcu_drm_drv.h"
  30
  31 static const struct regmap_config fsl_dcu_regmap_config = {
  32         .reg_bits = 32,
  33         .reg_stride = 4,
  34         .val_bits = 32,
  35         .cache_type = REGCACHE_RBTREE,
  36 };
  37
  38 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
  39 {
  40         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  41         unsigned int value;
  42         int ret;
  43
  44         ret = drm_irq_install(dev, fsl_dev->irq);
  45         if (ret < 0)
  46                 dev_err(dev->dev, "failed to install IRQ handler\n");
  47
  48         ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
  49         if (ret)
  50                 dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
  51         ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
  52         if (ret)
  53                 dev_err(dev->dev, "read DCU_INT_MASK failed\n");
  54         value &= DCU_INT_MASK_VBLANK;
  55         ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
  56         if (ret)
  57                 dev_err(dev->dev, "set DCU_INT_MASK failed\n");
  58         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  59                            DCU_UPDATE_MODE_READREG);
  60         if (ret)
  61                 dev_err(dev->dev, "set DCU_UPDATE_MODE failed\n");
  62
  63         return ret;
  64 }
  65
  66 static int fsl_dcu_load(struct drm_device *drm, unsigned long flags)
  67 {
  68         struct device *dev = drm->dev;
  69         struct fsl_dcu_drm_device *fsl_dev = drm->dev_private;
  70         int ret;
  71
  72         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  73         if (ret < 0) {
  74                 dev_err(dev, "failed to initialize mode setting\n");
  75                 return ret;
  76         }
  77
  78         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
  79         if (ret < 0) {
  80                 dev_err(dev, "failed to initialize vblank\n");
  81                 goto done;
  82         }
  83         drm->vblank_disable_allowed = true;
  84
  85         ret = fsl_dcu_drm_irq_init(drm);
  86         if (ret < 0)
  87                 goto done;
  88         drm->irq_enabled = true;
  89
  90         fsl_dcu_fbdev_init(drm);
  91
  92         return 0;
  93 done:
  94         if (ret) {
  95                 drm_mode_config_cleanup(drm);
  96                 drm_vblank_cleanup(drm);
  97                 drm_irq_uninstall(drm);
  98                 drm->dev_private = NULL;
  99         }
 100
 101         return ret;
 102 }
 103
 104 static int fsl_dcu_unload(struct drm_device *dev)
 105 {
 106         drm_mode_config_cleanup(dev);
 107         drm_vblank_cleanup(dev);
 108         drm_irq_uninstall(dev);
 109
 110         dev->dev_private = NULL;
 111
 112         return 0;
 113 }
 114
 115 static void fsl_dcu_drm_preclose(struct drm_device *dev, struct drm_file *file)
 116 {
 117 }
 118
 119 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 120 {
 121         struct drm_device *dev = arg;
 122         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 123         unsigned int int_status;
 124         int ret;
 125
 126         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 127         if (ret)
 128                 dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
 129         if (int_status & DCU_INT_STATUS_VBLANK)
 130                 drm_handle_vblank(dev, 0);
 131
 132         ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0xffffffff);
 133         if (ret)
 134                 dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
 135         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 136                            DCU_UPDATE_MODE_READREG);
 137         if (ret)
 138                 dev_err(dev->dev, "set DCU_UPDATE_MODE failed\n");
 139
 140         return IRQ_HANDLED;
 141 }
 142
 143 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 144 {
 145         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 146         unsigned int value;
 147         int ret;
 148
 149         ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 150         if (ret)
 151                 dev_err(dev->dev, "read DCU_INT_MASK failed\n");
 152         value &= ~DCU_INT_MASK_VBLANK;
 153         ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 154         if (ret)
 155                 dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 156         return 0;
 157 }
 158
 159 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
 160                                        unsigned int pipe)
 161 {
 162         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 163         unsigned int value;
 164         int ret;
 165
 166         ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 167         if (ret)
 168                 dev_err(dev->dev, "read DCU_INT_MASK failed\n");
 169         value |= DCU_INT_MASK_VBLANK;
 170         ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 171         if (ret)
 172                 dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 173 }
 174
 175 static const struct file_operations fsl_dcu_drm_fops = {
 176         .owner          = THIS_MODULE,
 177         .open           = drm_open,
 178         .release        = drm_release,
 179         .unlocked_ioctl = drm_ioctl,
 180 #ifdef CONFIG_COMPAT
 181         .compat_ioctl   = drm_compat_ioctl,
 182 #endif
 183         .poll           = drm_poll,
 184         .read           = drm_read,
 185         .llseek         = no_llseek,
 186         .mmap           = drm_gem_cma_mmap,
 187 };
 188
 189 static struct drm_driver fsl_dcu_drm_driver = {
 190         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 191                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 192         .load                   = fsl_dcu_load,
 193         .unload                 = fsl_dcu_unload,
 194         .preclose               = fsl_dcu_drm_preclose,
 195         .irq_handler            = fsl_dcu_drm_irq,
 196         .get_vblank_counter     = drm_vblank_no_hw_counter,
 197         .enable_vblank          = fsl_dcu_drm_enable_vblank,
 198         .disable_vblank         = fsl_dcu_drm_disable_vblank,
 199         .gem_free_object        = drm_gem_cma_free_object,
 200         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 201         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 202         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 203         .gem_prime_import       = drm_gem_prime_import,
 204         .gem_prime_export       = drm_gem_prime_export,
 205         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 206         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 207         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 208         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 209         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 210         .dumb_create            = drm_gem_cma_dumb_create,
 211         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 212         .dumb_destroy           = drm_gem_dumb_destroy,
 213         .fops                   = &fsl_dcu_drm_fops,
 214         .name                   = "fsl-dcu-drm",
 215         .desc                   = "Freescale DCU DRM",
 216         .date                   = "20150213",
 217         .major                  = 1,
 218         .minor                  = 0,
 219 };
 220
 221 #ifdef CONFIG_PM_SLEEP
 222 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 223 {
 224         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 225
 226         if (!fsl_dev)
 227                 return 0;
 228
 229         drm_kms_helper_poll_disable(fsl_dev->drm);
 230         regcache_cache_only(fsl_dev->regmap, true);
 231         regcache_mark_dirty(fsl_dev->regmap);
 232         clk_disable(fsl_dev->clk);
 233         clk_unprepare(fsl_dev->clk);
 234
 235         return 0;
 236 }
 237
 238 static int fsl_dcu_drm_pm_resume(struct device *dev)
 239 {
 240         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 241         int ret;
 242
 243         if (!fsl_dev)
 244                 return 0;
 245
 246         ret = clk_enable(fsl_dev->clk);
 247         if (ret < 0) {
 248                 dev_err(dev, "failed to enable dcu clk\n");
 249                 clk_unprepare(fsl_dev->clk);
 250                 return ret;
 251         }
 252         ret = clk_prepare(fsl_dev->clk);
 253         if (ret < 0) {
 254                 dev_err(dev, "failed to prepare dcu clk\n");
 255                 return ret;
 256         }
 257
 258         drm_kms_helper_poll_enable(fsl_dev->drm);
 259         regcache_cache_only(fsl_dev->regmap, false);
 260         regcache_sync(fsl_dev->regmap);
 261
 262         return 0;
 263 }
 264 #endif
 265
 266 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 267         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 268 };
 269
 270 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 271         .name = "ls1021a",
 272         .total_layer = 16,
 273         .max_layer = 4,
 274 };
 275
 276 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 277         .name = "vf610",
 278         .total_layer = 64,
 279         .max_layer = 6,
 280 };
 281
 282 static const struct of_device_id fsl_dcu_of_match[] = {
 283         {
 284                 .compatible = "fsl,ls1021a-dcu",
 285                 .data = &fsl_dcu_ls1021a_data,
 286         }, {
 287                 .compatible = "fsl,vf610-dcu",
 288                 .data = &fsl_dcu_vf610_data,
 289         }, {
 290         },
 291 };
 292 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 293
 294 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 295 {
 296         struct fsl_dcu_drm_device *fsl_dev;
 297         struct drm_device *drm;
 298         struct device *dev = &pdev->dev;
 299         struct resource *res;
 300         void __iomem *base;
 301         struct drm_driver *driver = &fsl_dcu_drm_driver;
 302         const struct of_device_id *id;
 303         int ret;
 304
 305         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 306         if (!fsl_dev)
 307                 return -ENOMEM;
 308
 309         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 310         if (!res) {
 311                 dev_err(dev, "could not get memory IO resource\n");
 312                 return -ENODEV;
 313         }
 314
 315         base = devm_ioremap_resource(dev, res);
 316         if (IS_ERR(base)) {
 317                 ret = PTR_ERR(base);
 318                 return ret;
 319         }
 320
 321         fsl_dev->irq = platform_get_irq(pdev, 0);
 322         if (fsl_dev->irq < 0) {
 323                 dev_err(dev, "failed to get irq\n");
 324                 return -ENXIO;
 325         }
 326
 327         fsl_dev->clk = devm_clk_get(dev, "dcu");
 328         if (IS_ERR(fsl_dev->clk)) {
 329                 ret = PTR_ERR(fsl_dev->clk);
 330                 dev_err(dev, "failed to get dcu clock\n");
 331                 return ret;
 332         }
 333         ret = clk_prepare(fsl_dev->clk);
 334         if (ret < 0) {
 335                 dev_err(dev, "failed to prepare dcu clk\n");
 336                 return ret;
 337         }
 338         ret = clk_enable(fsl_dev->clk);
 339         if (ret < 0) {
 340                 dev_err(dev, "failed to enable dcu clk\n");
 341                 clk_unprepare(fsl_dev->clk);
 342                 return ret;
 343         }
 344
 345         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 346                         &fsl_dcu_regmap_config);
 347         if (IS_ERR(fsl_dev->regmap)) {
 348                 dev_err(dev, "regmap init failed\n");
 349                 return PTR_ERR(fsl_dev->regmap);
 350         }
 351
 352         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 353         if (!id)
 354                 return -ENODEV;
 355         fsl_dev->soc = id->data;
 356
 357         drm = drm_dev_alloc(driver, dev);
 358         if (!drm)
 359                 return -ENOMEM;
 360
 361         fsl_dev->dev = dev;
 362         fsl_dev->drm = drm;
 363         fsl_dev->np = dev->of_node;
 364         drm->dev_private = fsl_dev;
 365         dev_set_drvdata(dev, fsl_dev);
 366         drm_dev_set_unique(drm, dev_name(dev));
 367
 368         ret = drm_dev_register(drm, 0);
 369         if (ret < 0)
 370                 goto unref;
 371
 372         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 373                  driver->major, driver->minor, driver->patchlevel,
 374                  driver->date, drm->primary->index);
 375
 376         return 0;
 377
 378 unref:
 379         drm_dev_unref(drm);
 380         return ret;
 381 }
 382
 383 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 384 {
 385         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 386
 387         drm_put_dev(fsl_dev->drm);
 388
 389         return 0;
 390 }
 391
 392 static struct platform_driver fsl_dcu_drm_platform_driver = {
 393         .probe          = fsl_dcu_drm_probe,
 394         .remove         = fsl_dcu_drm_remove,
 395         .driver         = {
 396                 .name   = "fsl-dcu",
 397                 .pm     = &fsl_dcu_drm_pm_ops,
 398                 .of_match_table = fsl_dcu_of_match,
 399         },
 400 };
 401
 402 module_platform_driver(fsl_dcu_drm_platform_driver);
 403
 404 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 405 MODULE_LICENSE("GPL");