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_fb_cma_helper.h>
  27 #include <drm/drm_gem_cma_helper.h>
  28
  29 #include "fsl_dcu_drm_crtc.h"
  30 #include "fsl_dcu_drm_drv.h"
  31 #include "fsl_tcon.h"
  32
  33 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  34 {
  35         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  36                 return true;
  37
  38         return false;
  39 }
  40
  41 static const struct regmap_config fsl_dcu_regmap_config = {
  42         .reg_bits = 32,
  43         .reg_stride = 4,
  44         .val_bits = 32,
  45         .cache_type = REGCACHE_FLAT,
  46
  47         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  48         .max_register = 0x11fc,
  49 };
  50
  51 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
  52 {
  53         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  54         int ret;
  55
  56         ret = drm_irq_install(dev, fsl_dev->irq);
  57         if (ret < 0)
  58                 dev_err(dev->dev, "failed to install IRQ handler\n");
  59
  60         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
  61         regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
  62         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  63                      DCU_UPDATE_MODE_READREG);
  64
  65         return ret;
  66 }
  67
  68 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
  69 {
  70         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  71         int ret;
  72
  73         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  74         if (ret < 0) {
  75                 dev_err(dev->dev, "failed to initialize mode setting\n");
  76                 return ret;
  77         }
  78
  79         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
  80         if (ret < 0) {
  81                 dev_err(dev->dev, "failed to initialize vblank\n");
  82                 goto done;
  83         }
  84
  85         ret = fsl_dcu_drm_irq_init(dev);
  86         if (ret < 0)
  87                 goto done;
  88         dev->irq_enabled = true;
  89
  90         fsl_dcu_fbdev_init(dev);
  91
  92         return 0;
  93 done:
  94         drm_kms_helper_poll_fini(dev);
  95
  96         if (fsl_dev->fbdev)
  97                 drm_fbdev_cma_fini(fsl_dev->fbdev);
  98
  99         drm_mode_config_cleanup(dev);
 100         drm_vblank_cleanup(dev);
 101         drm_irq_uninstall(dev);
 102         dev->dev_private = NULL;
 103
 104         return ret;
 105 }
 106
 107 static int fsl_dcu_unload(struct drm_device *dev)
 108 {
 109         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 110
 111         drm_kms_helper_poll_fini(dev);
 112
 113         if (fsl_dev->fbdev)
 114                 drm_fbdev_cma_fini(fsl_dev->fbdev);
 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, "read DCU_INT_STATUS failed\n");
 135                 return IRQ_NONE;
 136         }
 137
 138         if (int_status & DCU_INT_STATUS_VBLANK)
 139                 drm_handle_vblank(dev, 0);
 140
 141         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 142         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 143                      DCU_UPDATE_MODE_READREG);
 144
 145         return IRQ_HANDLED;
 146 }
 147
 148 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 149 {
 150         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 151         unsigned int value;
 152
 153         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 154         value &= ~DCU_INT_MASK_VBLANK;
 155         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 156
 157         return 0;
 158 }
 159
 160 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
 161                                        unsigned int pipe)
 162 {
 163         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 164         unsigned int value;
 165
 166         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 167         value |= DCU_INT_MASK_VBLANK;
 168         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 169 }
 170
 171 static void fsl_dcu_drm_lastclose(struct drm_device *dev)
 172 {
 173         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 174
 175         drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
 176 }
 177
 178 static const struct file_operations fsl_dcu_drm_fops = {
 179         .owner          = THIS_MODULE,
 180         .open           = drm_open,
 181         .release        = drm_release,
 182         .unlocked_ioctl = drm_ioctl,
 183 #ifdef CONFIG_COMPAT
 184         .compat_ioctl   = drm_compat_ioctl,
 185 #endif
 186         .poll           = drm_poll,
 187         .read           = drm_read,
 188         .llseek         = no_llseek,
 189         .mmap           = drm_gem_cma_mmap,
 190 };
 191
 192 static struct drm_driver fsl_dcu_drm_driver = {
 193         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 194                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 195         .lastclose              = fsl_dcu_drm_lastclose,
 196         .load                   = fsl_dcu_load,
 197         .unload                 = fsl_dcu_unload,
 198         .irq_handler            = fsl_dcu_drm_irq,
 199         .get_vblank_counter     = drm_vblank_no_hw_counter,
 200         .enable_vblank          = fsl_dcu_drm_enable_vblank,
 201         .disable_vblank         = fsl_dcu_drm_disable_vblank,
 202         .gem_free_object        = drm_gem_cma_free_object,
 203         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 204         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 205         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 206         .gem_prime_import       = drm_gem_prime_import,
 207         .gem_prime_export       = drm_gem_prime_export,
 208         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 209         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 210         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 211         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 212         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 213         .dumb_create            = drm_gem_cma_dumb_create,
 214         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 215         .dumb_destroy           = drm_gem_dumb_destroy,
 216         .fops                   = &fsl_dcu_drm_fops,
 217         .name                   = "fsl-dcu-drm",
 218         .desc                   = "Freescale DCU DRM",
 219         .date                   = "20160425",
 220         .major                  = 1,
 221         .minor                  = 1,
 222 };
 223
 224 #ifdef CONFIG_PM_SLEEP
 225 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 226 {
 227         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 228
 229         if (!fsl_dev)
 230                 return 0;
 231
 232         drm_kms_helper_poll_disable(fsl_dev->drm);
 233         regcache_cache_only(fsl_dev->regmap, true);
 234         regcache_mark_dirty(fsl_dev->regmap);
 235         clk_disable(fsl_dev->clk);
 236         clk_unprepare(fsl_dev->clk);
 237
 238         return 0;
 239 }
 240
 241 static int fsl_dcu_drm_pm_resume(struct device *dev)
 242 {
 243         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 244         int ret;
 245
 246         if (!fsl_dev)
 247                 return 0;
 248
 249         ret = clk_enable(fsl_dev->clk);
 250         if (ret < 0) {
 251                 dev_err(dev, "failed to enable dcu clk\n");
 252                 clk_unprepare(fsl_dev->clk);
 253                 return ret;
 254         }
 255         ret = clk_prepare(fsl_dev->clk);
 256         if (ret < 0) {
 257                 dev_err(dev, "failed to prepare dcu clk\n");
 258                 return ret;
 259         }
 260
 261         drm_kms_helper_poll_enable(fsl_dev->drm);
 262         regcache_cache_only(fsl_dev->regmap, false);
 263         regcache_sync(fsl_dev->regmap);
 264
 265         return 0;
 266 }
 267 #endif
 268
 269 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 270         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 271 };
 272
 273 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 274         .name = "ls1021a",
 275         .total_layer = 16,
 276         .max_layer = 4,
 277 };
 278
 279 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 280         .name = "vf610",
 281         .total_layer = 64,
 282         .max_layer = 6,
 283 };
 284
 285 static const struct of_device_id fsl_dcu_of_match[] = {
 286         {
 287                 .compatible = "fsl,ls1021a-dcu",
 288                 .data = &fsl_dcu_ls1021a_data,
 289         }, {
 290                 .compatible = "fsl,vf610-dcu",
 291                 .data = &fsl_dcu_vf610_data,
 292         }, {
 293         },
 294 };
 295 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 296
 297 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 298 {
 299         struct fsl_dcu_drm_device *fsl_dev;
 300         struct drm_device *drm;
 301         struct device *dev = &pdev->dev;
 302         struct resource *res;
 303         void __iomem *base;
 304         struct drm_driver *driver = &fsl_dcu_drm_driver;
 305         struct clk *pix_clk_in;
 306         char pix_clk_name[32];
 307         const char *pix_clk_in_name;
 308         const struct of_device_id *id;
 309         int ret;
 310
 311         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 312         if (!fsl_dev)
 313                 return -ENOMEM;
 314
 315         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 316         if (!id)
 317                 return -ENODEV;
 318         fsl_dev->soc = id->data;
 319
 320         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 321         if (!res) {
 322                 dev_err(dev, "could not get memory IO resource\n");
 323                 return -ENODEV;
 324         }
 325
 326         base = devm_ioremap_resource(dev, res);
 327         if (IS_ERR(base)) {
 328                 ret = PTR_ERR(base);
 329                 return ret;
 330         }
 331
 332         fsl_dev->irq = platform_get_irq(pdev, 0);
 333         if (fsl_dev->irq < 0) {
 334                 dev_err(dev, "failed to get irq\n");
 335                 return -ENXIO;
 336         }
 337
 338         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 339                         &fsl_dcu_regmap_config);
 340         if (IS_ERR(fsl_dev->regmap)) {
 341                 dev_err(dev, "regmap init failed\n");
 342                 return PTR_ERR(fsl_dev->regmap);
 343         }
 344
 345         fsl_dev->clk = devm_clk_get(dev, "dcu");
 346         if (IS_ERR(fsl_dev->clk)) {
 347                 dev_err(dev, "failed to get dcu clock\n");
 348                 return PTR_ERR(fsl_dev->clk);
 349         }
 350         ret = clk_prepare_enable(fsl_dev->clk);
 351         if (ret < 0) {
 352                 dev_err(dev, "failed to enable dcu clk\n");
 353                 return ret;
 354         }
 355
 356         pix_clk_in = devm_clk_get(dev, "pix");
 357         if (IS_ERR(pix_clk_in)) {
 358                 /* legancy binding, use dcu clock as pixel clock input */
 359                 pix_clk_in = fsl_dev->clk;
 360         }
 361
 362         pix_clk_in_name = __clk_get_name(pix_clk_in);
 363         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 364         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 365                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 366                         0, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 367         if (IS_ERR(fsl_dev->pix_clk)) {
 368                 dev_err(dev, "failed to register pix clk\n");
 369                 ret = PTR_ERR(fsl_dev->pix_clk);
 370                 goto disable_clk;
 371         }
 372
 373         ret = clk_prepare_enable(fsl_dev->pix_clk);
 374         if (ret < 0) {
 375                 dev_err(dev, "failed to enable pix clk\n");
 376                 goto unregister_pix_clk;
 377         }
 378
 379         fsl_dev->tcon = fsl_tcon_init(dev);
 380
 381         drm = drm_dev_alloc(driver, dev);
 382         if (!drm) {
 383                 ret = -ENOMEM;
 384                 goto disable_pix_clk;
 385         }
 386
 387         fsl_dev->dev = dev;
 388         fsl_dev->drm = drm;
 389         fsl_dev->np = dev->of_node;
 390         drm->dev_private = fsl_dev;
 391         dev_set_drvdata(dev, fsl_dev);
 392
 393         ret = drm_dev_register(drm, 0);
 394         if (ret < 0)
 395                 goto unref;
 396
 397         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 398                  driver->major, driver->minor, driver->patchlevel,
 399                  driver->date, drm->primary->index);
 400
 401         return 0;
 402
 403 unref:
 404         drm_dev_unref(drm);
 405 disable_pix_clk:
 406         clk_disable_unprepare(fsl_dev->pix_clk);
 407 unregister_pix_clk:
 408         clk_unregister(fsl_dev->pix_clk);
 409 disable_clk:
 410         clk_disable_unprepare(fsl_dev->clk);
 411         return ret;
 412 }
 413
 414 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 415 {
 416         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 417
 418         clk_disable_unprepare(fsl_dev->clk);
 419         clk_disable_unprepare(fsl_dev->pix_clk);
 420         clk_unregister(fsl_dev->pix_clk);
 421         drm_put_dev(fsl_dev->drm);
 422
 423         return 0;
 424 }
 425
 426 static struct platform_driver fsl_dcu_drm_platform_driver = {
 427         .probe          = fsl_dcu_drm_probe,
 428         .remove         = fsl_dcu_drm_remove,
 429         .driver         = {
 430                 .name   = "fsl-dcu",
 431                 .pm     = &fsl_dcu_drm_pm_ops,
 432                 .of_match_table = fsl_dcu_of_match,
 433         },
 434 };
 435
 436 module_platform_driver(fsl_dcu_drm_platform_driver);
 437
 438 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 439 MODULE_LICENSE("GPL");