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, int crtc)
 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, int crtc)
 160 {
 161         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 162         unsigned int value;
 163         int ret;
 164
 165         ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 166         if (ret)
 167                 dev_err(dev->dev, "read DCU_INT_MASK failed\n");
 168         value |= DCU_INT_MASK_VBLANK;
 169         ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 170         if (ret)
 171                 dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 172 }
 173
 174 static const struct file_operations fsl_dcu_drm_fops = {
 175         .owner          = THIS_MODULE,
 176         .open           = drm_open,
 177         .release        = drm_release,
 178         .unlocked_ioctl = drm_ioctl,
 179 #ifdef CONFIG_COMPAT
 180         .compat_ioctl   = drm_compat_ioctl,
 181 #endif
 182         .poll           = drm_poll,
 183         .read           = drm_read,
 184         .llseek         = no_llseek,
 185         .mmap           = drm_gem_cma_mmap,
 186 };
 187
 188 static struct drm_driver fsl_dcu_drm_driver = {
 189         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 190                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 191         .load                   = fsl_dcu_load,
 192         .unload                 = fsl_dcu_unload,
 193         .preclose               = fsl_dcu_drm_preclose,
 194         .irq_handler            = fsl_dcu_drm_irq,
 195         .get_vblank_counter     = drm_vblank_count,
 196         .enable_vblank          = fsl_dcu_drm_enable_vblank,
 197         .disable_vblank         = fsl_dcu_drm_disable_vblank,
 198         .gem_free_object        = drm_gem_cma_free_object,
 199         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 200         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 201         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 202         .gem_prime_import       = drm_gem_prime_import,
 203         .gem_prime_export       = drm_gem_prime_export,
 204         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 205         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 206         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 207         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 208         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 209         .dumb_create            = drm_gem_cma_dumb_create,
 210         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 211         .dumb_destroy           = drm_gem_dumb_destroy,
 212         .fops                   = &fsl_dcu_drm_fops,
 213         .name                   = "fsl-dcu-drm",
 214         .desc                   = "Freescale DCU DRM",
 215         .date                   = "20150213",
 216         .major                  = 1,
 217         .minor                  = 0,
 218 };
 219
 220 #ifdef CONFIG_PM_SLEEP
 221 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 222 {
 223         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 224
 225         if (!fsl_dev)
 226                 return 0;
 227
 228         drm_kms_helper_poll_disable(fsl_dev->drm);
 229         regcache_cache_only(fsl_dev->regmap, true);
 230         regcache_mark_dirty(fsl_dev->regmap);
 231         clk_disable(fsl_dev->clk);
 232         clk_unprepare(fsl_dev->clk);
 233
 234         return 0;
 235 }
 236
 237 static int fsl_dcu_drm_pm_resume(struct device *dev)
 238 {
 239         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 240         int ret;
 241
 242         if (!fsl_dev)
 243                 return 0;
 244
 245         ret = clk_enable(fsl_dev->clk);
 246         if (ret < 0) {
 247                 dev_err(dev, "failed to enable dcu clk\n");
 248                 clk_unprepare(fsl_dev->clk);
 249                 return ret;
 250         }
 251         ret = clk_prepare(fsl_dev->clk);
 252         if (ret < 0) {
 253                 dev_err(dev, "failed to prepare dcu clk\n");
 254                 return ret;
 255         }
 256
 257         drm_kms_helper_poll_enable(fsl_dev->drm);
 258         regcache_cache_only(fsl_dev->regmap, false);
 259         regcache_sync(fsl_dev->regmap);
 260
 261         return 0;
 262 }
 263 #endif
 264
 265 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 266         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 267 };
 268
 269 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 270         .name = "ls1021a",
 271         .total_layer = 16,
 272         .max_layer = 4,
 273 };
 274
 275 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 276         .name = "vf610",
 277         .total_layer = 64,
 278         .max_layer = 6,
 279 };
 280
 281 static const struct of_device_id fsl_dcu_of_match[] = {
 282         {
 283                 .compatible = "fsl,ls1021a-dcu",
 284                 .data = &fsl_dcu_ls1021a_data,
 285         }, {
 286                 .compatible = "fsl,vf610-dcu",
 287                 .data = &fsl_dcu_vf610_data,
 288         }, {
 289         },
 290 };
 291 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 292
 293 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 294 {
 295         struct fsl_dcu_drm_device *fsl_dev;
 296         struct drm_device *drm;
 297         struct device *dev = &pdev->dev;
 298         struct resource *res;
 299         void __iomem *base;
 300         struct drm_driver *driver = &fsl_dcu_drm_driver;
 301         const struct of_device_id *id;
 302         int ret;
 303
 304         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 305         if (!fsl_dev)
 306                 return -ENOMEM;
 307
 308         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 309         if (!res) {
 310                 dev_err(dev, "could not get memory IO resource\n");
 311                 return -ENODEV;
 312         }
 313
 314         base = devm_ioremap_resource(dev, res);
 315         if (IS_ERR(base)) {
 316                 ret = PTR_ERR(base);
 317                 return ret;
 318         }
 319
 320         fsl_dev->irq = platform_get_irq(pdev, 0);
 321         if (fsl_dev->irq < 0) {
 322                 dev_err(dev, "failed to get irq\n");
 323                 return -ENXIO;
 324         }
 325
 326         fsl_dev->clk = devm_clk_get(dev, "dcu");
 327         if (IS_ERR(fsl_dev->clk)) {
 328                 ret = PTR_ERR(fsl_dev->clk);
 329                 dev_err(dev, "failed to get dcu clock\n");
 330                 return ret;
 331         }
 332         ret = clk_prepare(fsl_dev->clk);
 333         if (ret < 0) {
 334                 dev_err(dev, "failed to prepare dcu clk\n");
 335                 return ret;
 336         }
 337         ret = clk_enable(fsl_dev->clk);
 338         if (ret < 0) {
 339                 dev_err(dev, "failed to enable dcu clk\n");
 340                 clk_unprepare(fsl_dev->clk);
 341                 return ret;
 342         }
 343
 344         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 345                         &fsl_dcu_regmap_config);
 346         if (IS_ERR(fsl_dev->regmap)) {
 347                 dev_err(dev, "regmap init failed\n");
 348                 return PTR_ERR(fsl_dev->regmap);
 349         }
 350
 351         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 352         if (!id)
 353                 return -ENODEV;
 354         fsl_dev->soc = id->data;
 355
 356         drm = drm_dev_alloc(driver, dev);
 357         if (!drm)
 358                 return -ENOMEM;
 359
 360         fsl_dev->dev = dev;
 361         fsl_dev->drm = drm;
 362         fsl_dev->np = dev->of_node;
 363         drm->dev_private = fsl_dev;
 364         dev_set_drvdata(dev, fsl_dev);
 365         drm_dev_set_unique(drm, dev_name(dev));
 366
 367         ret = drm_dev_register(drm, 0);
 368         if (ret < 0)
 369                 goto unref;
 370
 371         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 372                  driver->major, driver->minor, driver->patchlevel,
 373                  driver->date, drm->primary->index);
 374
 375         return 0;
 376
 377 unref:
 378         drm_dev_unref(drm);
 379         return ret;
 380 }
 381
 382 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 383 {
 384         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 385
 386         drm_put_dev(fsl_dev->drm);
 387
 388         return 0;
 389 }
 390
 391 static struct platform_driver fsl_dcu_drm_platform_driver = {
 392         .probe          = fsl_dcu_drm_probe,
 393         .remove         = fsl_dcu_drm_remove,
 394         .driver         = {
 395                 .name   = "fsl-dcu",
 396                 .pm     = &fsl_dcu_drm_pm_ops,
 397                 .of_match_table = fsl_dcu_of_match,
 398         },
 399 };
 400
 401 module_platform_driver(fsl_dcu_drm_platform_driver);
 402
 403 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 404 MODULE_LICENSE("GPL");