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/console.h>
  15 #include <linux/io.h>
  16 #include <linux/mfd/syscon.h>
  17 #include <linux/mm.h>
  18 #include <linux/module.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm.h>
  22 #include <linux/pm_runtime.h>
  23 #include <linux/regmap.h>
  24
  25 #include <drm/drmP.h>
  26 #include <drm/drm_atomic_helper.h>
  27 #include <drm/drm_crtc_helper.h>
  28 #include <drm/drm_fb_cma_helper.h>
  29 #include <drm/drm_gem_cma_helper.h>
  30
  31 #include "fsl_dcu_drm_crtc.h"
  32 #include "fsl_dcu_drm_drv.h"
  33 #include "fsl_tcon.h"
  34
  35 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  36 {
  37         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  38                 return true;
  39
  40         return false;
  41 }
  42
  43 static const struct regmap_config fsl_dcu_regmap_config = {
  44         .reg_bits = 32,
  45         .reg_stride = 4,
  46         .val_bits = 32,
  47
  48         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  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_unlocked = 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         disable_irq(fsl_dev->irq);
 233         drm_kms_helper_poll_disable(fsl_dev->drm);
 234
 235         console_lock();
 236         drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 1);
 237         console_unlock();
 238
 239         fsl_dev->state = drm_atomic_helper_suspend(fsl_dev->drm);
 240         if (IS_ERR(fsl_dev->state)) {
 241                 console_lock();
 242                 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
 243                 console_unlock();
 244
 245                 drm_kms_helper_poll_enable(fsl_dev->drm);
 246                 enable_irq(fsl_dev->irq);
 247                 return PTR_ERR(fsl_dev->state);
 248         }
 249
 250         clk_disable_unprepare(fsl_dev->pix_clk);
 251         clk_disable_unprepare(fsl_dev->clk);
 252
 253         return 0;
 254 }
 255
 256 static int fsl_dcu_drm_pm_resume(struct device *dev)
 257 {
 258         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 259         int ret;
 260
 261         if (!fsl_dev)
 262                 return 0;
 263
 264         ret = clk_prepare_enable(fsl_dev->clk);
 265         if (ret < 0) {
 266                 dev_err(dev, "failed to enable dcu clk\n");
 267                 return ret;
 268         }
 269
 270         ret = clk_prepare_enable(fsl_dev->pix_clk);
 271         if (ret < 0) {
 272                 dev_err(dev, "failed to enable pix clk\n");
 273                 goto disable_dcu_clk;
 274         }
 275
 276         if (fsl_dev->tcon)
 277                 fsl_tcon_bypass_enable(fsl_dev->tcon);
 278         fsl_dcu_drm_init_planes(fsl_dev->drm);
 279         drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
 280
 281         console_lock();
 282         drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
 283         console_unlock();
 284
 285         drm_kms_helper_poll_enable(fsl_dev->drm);
 286         enable_irq(fsl_dev->irq);
 287
 288         return 0;
 289
 290 disable_dcu_clk:
 291         clk_disable_unprepare(fsl_dev->clk);
 292         return ret;
 293 }
 294 #endif
 295
 296 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 297         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 298 };
 299
 300 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 301         .name = "ls1021a",
 302         .total_layer = 16,
 303         .max_layer = 4,
 304         .layer_regs = LS1021A_LAYER_REG_NUM,
 305 };
 306
 307 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 308         .name = "vf610",
 309         .total_layer = 64,
 310         .max_layer = 6,
 311         .layer_regs = VF610_LAYER_REG_NUM,
 312 };
 313
 314 static const struct of_device_id fsl_dcu_of_match[] = {
 315         {
 316                 .compatible = "fsl,ls1021a-dcu",
 317                 .data = &fsl_dcu_ls1021a_data,
 318         }, {
 319                 .compatible = "fsl,vf610-dcu",
 320                 .data = &fsl_dcu_vf610_data,
 321         }, {
 322         },
 323 };
 324 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 325
 326 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 327 {
 328         struct fsl_dcu_drm_device *fsl_dev;
 329         struct drm_device *drm;
 330         struct device *dev = &pdev->dev;
 331         struct resource *res;
 332         void __iomem *base;
 333         struct drm_driver *driver = &fsl_dcu_drm_driver;
 334         struct clk *pix_clk_in;
 335         char pix_clk_name[32];
 336         const char *pix_clk_in_name;
 337         const struct of_device_id *id;
 338         int ret;
 339         u8 div_ratio_shift = 0;
 340
 341         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 342         if (!fsl_dev)
 343                 return -ENOMEM;
 344
 345         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 346         if (!id)
 347                 return -ENODEV;
 348         fsl_dev->soc = id->data;
 349
 350         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 351         if (!res) {
 352                 dev_err(dev, "could not get memory IO resource\n");
 353                 return -ENODEV;
 354         }
 355
 356         base = devm_ioremap_resource(dev, res);
 357         if (IS_ERR(base)) {
 358                 ret = PTR_ERR(base);
 359                 return ret;
 360         }
 361
 362         fsl_dev->irq = platform_get_irq(pdev, 0);
 363         if (fsl_dev->irq < 0) {
 364                 dev_err(dev, "failed to get irq\n");
 365                 return -ENXIO;
 366         }
 367
 368         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 369                         &fsl_dcu_regmap_config);
 370         if (IS_ERR(fsl_dev->regmap)) {
 371                 dev_err(dev, "regmap init failed\n");
 372                 return PTR_ERR(fsl_dev->regmap);
 373         }
 374
 375         fsl_dev->clk = devm_clk_get(dev, "dcu");
 376         if (IS_ERR(fsl_dev->clk)) {
 377                 dev_err(dev, "failed to get dcu clock\n");
 378                 return PTR_ERR(fsl_dev->clk);
 379         }
 380         ret = clk_prepare_enable(fsl_dev->clk);
 381         if (ret < 0) {
 382                 dev_err(dev, "failed to enable dcu clk\n");
 383                 return ret;
 384         }
 385
 386         pix_clk_in = devm_clk_get(dev, "pix");
 387         if (IS_ERR(pix_clk_in)) {
 388                 /* legancy binding, use dcu clock as pixel clock input */
 389                 pix_clk_in = fsl_dev->clk;
 390         }
 391
 392         if (of_property_read_bool(dev->of_node, "big-endian"))
 393                 div_ratio_shift = 24;
 394
 395         pix_clk_in_name = __clk_get_name(pix_clk_in);
 396         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 397         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 398                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 399                         div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 400         if (IS_ERR(fsl_dev->pix_clk)) {
 401                 dev_err(dev, "failed to register pix clk\n");
 402                 ret = PTR_ERR(fsl_dev->pix_clk);
 403                 goto disable_clk;
 404         }
 405
 406         ret = clk_prepare_enable(fsl_dev->pix_clk);
 407         if (ret < 0) {
 408                 dev_err(dev, "failed to enable pix clk\n");
 409                 goto unregister_pix_clk;
 410         }
 411
 412         fsl_dev->tcon = fsl_tcon_init(dev);
 413
 414         drm = drm_dev_alloc(driver, dev);
 415         if (IS_ERR(drm)) {
 416                 ret = PTR_ERR(drm);
 417                 goto disable_pix_clk;
 418         }
 419
 420         fsl_dev->dev = dev;
 421         fsl_dev->drm = drm;
 422         fsl_dev->np = dev->of_node;
 423         drm->dev_private = fsl_dev;
 424         dev_set_drvdata(dev, fsl_dev);
 425
 426         ret = drm_dev_register(drm, 0);
 427         if (ret < 0)
 428                 goto unref;
 429
 430         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 431                  driver->major, driver->minor, driver->patchlevel,
 432                  driver->date, drm->primary->index);
 433
 434         return 0;
 435
 436 unref:
 437         drm_dev_unref(drm);
 438 disable_pix_clk:
 439         clk_disable_unprepare(fsl_dev->pix_clk);
 440 unregister_pix_clk:
 441         clk_unregister(fsl_dev->pix_clk);
 442 disable_clk:
 443         clk_disable_unprepare(fsl_dev->clk);
 444         return ret;
 445 }
 446
 447 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 448 {
 449         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 450
 451         clk_disable_unprepare(fsl_dev->clk);
 452         clk_disable_unprepare(fsl_dev->pix_clk);
 453         clk_unregister(fsl_dev->pix_clk);
 454         drm_put_dev(fsl_dev->drm);
 455
 456         return 0;
 457 }
 458
 459 static struct platform_driver fsl_dcu_drm_platform_driver = {
 460         .probe          = fsl_dcu_drm_probe,
 461         .remove         = fsl_dcu_drm_remove,
 462         .driver         = {
 463                 .name   = "fsl-dcu",
 464                 .pm     = &fsl_dcu_drm_pm_ops,
 465                 .of_match_table = fsl_dcu_of_match,
 466         },
 467 };
 468
 469 module_platform_driver(fsl_dcu_drm_platform_driver);
 470
 471 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 472 MODULE_LICENSE("GPL");