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 bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  32 {
  33         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  34                 return true;
  35
  36         return false;
  37 }
  38
  39 static const struct regmap_config fsl_dcu_regmap_config = {
  40         .reg_bits = 32,
  41         .reg_stride = 4,
  42         .val_bits = 32,
  43         .cache_type = REGCACHE_RBTREE,
  44
  45         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  46 };
  47
  48 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
  49 {
  50         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  51         unsigned int value;
  52         int ret;
  53
  54         ret = drm_irq_install(dev, fsl_dev->irq);
  55         if (ret < 0)
  56                 dev_err(dev->dev, "failed to install IRQ handler\n");
  57
  58         ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
  59         if (ret)
  60                 dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
  61         ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
  62         if (ret)
  63                 dev_err(dev->dev, "read DCU_INT_MASK failed\n");
  64         value &= DCU_INT_MASK_VBLANK;
  65         ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
  66         if (ret)
  67                 dev_err(dev->dev, "set DCU_INT_MASK failed\n");
  68         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  69                            DCU_UPDATE_MODE_READREG);
  70         if (ret)
  71                 dev_err(dev->dev, "set DCU_UPDATE_MODE failed\n");
  72
  73         return ret;
  74 }
  75
  76 static int fsl_dcu_load(struct drm_device *drm, unsigned long flags)
  77 {
  78         struct device *dev = drm->dev;
  79         struct fsl_dcu_drm_device *fsl_dev = drm->dev_private;
  80         int ret;
  81
  82         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  83         if (ret < 0) {
  84                 dev_err(dev, "failed to initialize mode setting\n");
  85                 return ret;
  86         }
  87
  88         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
  89         if (ret < 0) {
  90                 dev_err(dev, "failed to initialize vblank\n");
  91                 goto done;
  92         }
  93         drm->vblank_disable_allowed = true;
  94
  95         ret = fsl_dcu_drm_irq_init(drm);
  96         if (ret < 0)
  97                 goto done;
  98         drm->irq_enabled = true;
  99
 100         fsl_dcu_fbdev_init(drm);
 101
 102         return 0;
 103 done:
 104         if (ret) {
 105                 drm_mode_config_cleanup(drm);
 106                 drm_vblank_cleanup(drm);
 107                 drm_irq_uninstall(drm);
 108                 drm->dev_private = NULL;
 109         }
 110
 111         return ret;
 112 }
 113
 114 static int fsl_dcu_unload(struct drm_device *dev)
 115 {
 116         drm_mode_config_cleanup(dev);
 117         drm_vblank_cleanup(dev);
 118         drm_irq_uninstall(dev);
 119
 120         dev->dev_private = NULL;
 121
 122         return 0;
 123 }
 124
 125 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 126 {
 127         struct drm_device *dev = arg;
 128         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 129         unsigned int int_status;
 130         int ret;
 131
 132         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 133         if (ret)
 134                 dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
 135         if (int_status & DCU_INT_STATUS_VBLANK)
 136                 drm_handle_vblank(dev, 0);
 137
 138         ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 139         if (ret)
 140                 dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
 141         ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 142                            DCU_UPDATE_MODE_READREG);
 143         if (ret)
 144                 dev_err(dev->dev, "set DCU_UPDATE_MODE failed\n");
 145
 146         return IRQ_HANDLED;
 147 }
 148
 149 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 150 {
 151         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 152         unsigned int value;
 153         int ret;
 154
 155         ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 156         if (ret)
 157                 dev_err(dev->dev, "read DCU_INT_MASK failed\n");
 158         value &= ~DCU_INT_MASK_VBLANK;
 159         ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 160         if (ret)
 161                 dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 162         return 0;
 163 }
 164
 165 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
 166                                        unsigned int pipe)
 167 {
 168         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 169         unsigned int value;
 170         int ret;
 171
 172         ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 173         if (ret)
 174                 dev_err(dev->dev, "read DCU_INT_MASK failed\n");
 175         value |= DCU_INT_MASK_VBLANK;
 176         ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 177         if (ret)
 178                 dev_err(dev->dev, "set DCU_INT_MASK failed\n");
 179 }
 180
 181 static const struct file_operations fsl_dcu_drm_fops = {
 182         .owner          = THIS_MODULE,
 183         .open           = drm_open,
 184         .release        = drm_release,
 185         .unlocked_ioctl = drm_ioctl,
 186 #ifdef CONFIG_COMPAT
 187         .compat_ioctl   = drm_compat_ioctl,
 188 #endif
 189         .poll           = drm_poll,
 190         .read           = drm_read,
 191         .llseek         = no_llseek,
 192         .mmap           = drm_gem_cma_mmap,
 193 };
 194
 195 static struct drm_driver fsl_dcu_drm_driver = {
 196         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 197                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 198         .load                   = fsl_dcu_load,
 199         .unload                 = fsl_dcu_unload,
 200         .irq_handler            = fsl_dcu_drm_irq,
 201         .get_vblank_counter     = drm_vblank_no_hw_counter,
 202         .enable_vblank          = fsl_dcu_drm_enable_vblank,
 203         .disable_vblank         = fsl_dcu_drm_disable_vblank,
 204         .gem_free_object        = drm_gem_cma_free_object,
 205         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 206         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 207         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 208         .gem_prime_import       = drm_gem_prime_import,
 209         .gem_prime_export       = drm_gem_prime_export,
 210         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 211         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 212         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 213         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 214         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 215         .dumb_create            = drm_gem_cma_dumb_create,
 216         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 217         .dumb_destroy           = drm_gem_dumb_destroy,
 218         .fops                   = &fsl_dcu_drm_fops,
 219         .name                   = "fsl-dcu-drm",
 220         .desc                   = "Freescale DCU DRM",
 221         .date                   = "20150213",
 222         .major                  = 1,
 223         .minor                  = 0,
 224 };
 225
 226 #ifdef CONFIG_PM_SLEEP
 227 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 228 {
 229         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 230
 231         if (!fsl_dev)
 232                 return 0;
 233
 234         drm_kms_helper_poll_disable(fsl_dev->drm);
 235         regcache_cache_only(fsl_dev->regmap, true);
 236         regcache_mark_dirty(fsl_dev->regmap);
 237         clk_disable(fsl_dev->clk);
 238         clk_unprepare(fsl_dev->clk);
 239
 240         return 0;
 241 }
 242
 243 static int fsl_dcu_drm_pm_resume(struct device *dev)
 244 {
 245         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 246         int ret;
 247
 248         if (!fsl_dev)
 249                 return 0;
 250
 251         ret = clk_enable(fsl_dev->clk);
 252         if (ret < 0) {
 253                 dev_err(dev, "failed to enable dcu clk\n");
 254                 clk_unprepare(fsl_dev->clk);
 255                 return ret;
 256         }
 257         ret = clk_prepare(fsl_dev->clk);
 258         if (ret < 0) {
 259                 dev_err(dev, "failed to prepare dcu clk\n");
 260                 return ret;
 261         }
 262
 263         drm_kms_helper_poll_enable(fsl_dev->drm);
 264         regcache_cache_only(fsl_dev->regmap, false);
 265         regcache_sync(fsl_dev->regmap);
 266
 267         return 0;
 268 }
 269 #endif
 270
 271 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 272         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 273 };
 274
 275 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 276         .name = "ls1021a",
 277         .total_layer = 16,
 278         .max_layer = 4,
 279 };
 280
 281 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 282         .name = "vf610",
 283         .total_layer = 64,
 284         .max_layer = 6,
 285 };
 286
 287 static const struct of_device_id fsl_dcu_of_match[] = {
 288         {
 289                 .compatible = "fsl,ls1021a-dcu",
 290                 .data = &fsl_dcu_ls1021a_data,
 291         }, {
 292                 .compatible = "fsl,vf610-dcu",
 293                 .data = &fsl_dcu_vf610_data,
 294         }, {
 295         },
 296 };
 297 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 298
 299 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 300 {
 301         struct fsl_dcu_drm_device *fsl_dev;
 302         struct drm_device *drm;
 303         struct device *dev = &pdev->dev;
 304         struct resource *res;
 305         void __iomem *base;
 306         struct drm_driver *driver = &fsl_dcu_drm_driver;
 307         const struct of_device_id *id;
 308         int ret;
 309
 310         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 311         if (!fsl_dev)
 312                 return -ENOMEM;
 313
 314         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 315         if (!res) {
 316                 dev_err(dev, "could not get memory IO resource\n");
 317                 return -ENODEV;
 318         }
 319
 320         base = devm_ioremap_resource(dev, res);
 321         if (IS_ERR(base)) {
 322                 ret = PTR_ERR(base);
 323                 return ret;
 324         }
 325
 326         fsl_dev->irq = platform_get_irq(pdev, 0);
 327         if (fsl_dev->irq < 0) {
 328                 dev_err(dev, "failed to get irq\n");
 329                 return -ENXIO;
 330         }
 331
 332         fsl_dev->clk = devm_clk_get(dev, "dcu");
 333         if (IS_ERR(fsl_dev->clk)) {
 334                 ret = PTR_ERR(fsl_dev->clk);
 335                 dev_err(dev, "failed to get dcu clock\n");
 336                 return ret;
 337         }
 338         ret = clk_prepare(fsl_dev->clk);
 339         if (ret < 0) {
 340                 dev_err(dev, "failed to prepare dcu clk\n");
 341                 return ret;
 342         }
 343         ret = clk_enable(fsl_dev->clk);
 344         if (ret < 0) {
 345                 dev_err(dev, "failed to enable dcu clk\n");
 346                 clk_unprepare(fsl_dev->clk);
 347                 return ret;
 348         }
 349
 350         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 351                         &fsl_dcu_regmap_config);
 352         if (IS_ERR(fsl_dev->regmap)) {
 353                 dev_err(dev, "regmap init failed\n");
 354                 return PTR_ERR(fsl_dev->regmap);
 355         }
 356
 357         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 358         if (!id)
 359                 return -ENODEV;
 360         fsl_dev->soc = id->data;
 361
 362         drm = drm_dev_alloc(driver, dev);
 363         if (!drm)
 364                 return -ENOMEM;
 365
 366         fsl_dev->dev = dev;
 367         fsl_dev->drm = drm;
 368         fsl_dev->np = dev->of_node;
 369         drm->dev_private = fsl_dev;
 370         dev_set_drvdata(dev, fsl_dev);
 371
 372         ret = drm_dev_register(drm, 0);
 373         if (ret < 0)
 374                 goto unref;
 375
 376         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 377                  driver->major, driver->minor, driver->patchlevel,
 378                  driver->date, drm->primary->index);
 379
 380         return 0;
 381
 382 unref:
 383         drm_dev_unref(drm);
 384         return ret;
 385 }
 386
 387 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 388 {
 389         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 390
 391         drm_put_dev(fsl_dev->drm);
 392
 393         return 0;
 394 }
 395
 396 static struct platform_driver fsl_dcu_drm_platform_driver = {
 397         .probe          = fsl_dcu_drm_probe,
 398         .remove         = fsl_dcu_drm_remove,
 399         .driver         = {
 400                 .name   = "fsl-dcu",
 401                 .pm     = &fsl_dcu_drm_pm_ops,
 402                 .of_match_table = fsl_dcu_of_match,
 403         },
 404 };
 405
 406 module_platform_driver(fsl_dcu_drm_platform_driver);
 407
 408 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 409 MODULE_LICENSE("GPL");