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