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
  63         return ret;
  64 }
  65
  66 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
  67 {
  68         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  69         int ret;
  70
  71         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  72         if (ret < 0) {
  73                 dev_err(dev->dev, "failed to initialize mode setting\n");
  74                 return ret;
  75         }
  76
  77         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
  78         if (ret < 0) {
  79                 dev_err(dev->dev, "failed to initialize vblank\n");
  80                 goto done;
  81         }
  82
  83         ret = fsl_dcu_drm_irq_init(dev);
  84         if (ret < 0)
  85                 goto done;
  86         dev->irq_enabled = true;
  87
  88         fsl_dcu_fbdev_init(dev);
  89
  90         return 0;
  91 done:
  92         drm_kms_helper_poll_fini(dev);
  93
  94         if (fsl_dev->fbdev)
  95                 drm_fbdev_cma_fini(fsl_dev->fbdev);
  96
  97         drm_mode_config_cleanup(dev);
  98         drm_vblank_cleanup(dev);
  99         drm_irq_uninstall(dev);
 100         dev->dev_private = NULL;
 101
 102         return ret;
 103 }
 104
 105 static int fsl_dcu_unload(struct drm_device *dev)
 106 {
 107         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 108
 109         drm_kms_helper_poll_fini(dev);
 110
 111         if (fsl_dev->fbdev)
 112                 drm_fbdev_cma_fini(fsl_dev->fbdev);
 113
 114         drm_mode_config_cleanup(dev);
 115         drm_vblank_cleanup(dev);
 116         drm_irq_uninstall(dev);
 117
 118         dev->dev_private = NULL;
 119
 120         return 0;
 121 }
 122
 123 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 124 {
 125         struct drm_device *dev = arg;
 126         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 127         unsigned int int_status;
 128         int ret;
 129
 130         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 131         if (ret) {
 132                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
 133                 return IRQ_NONE;
 134         }
 135
 136         if (int_status & DCU_INT_STATUS_VBLANK)
 137                 drm_handle_vblank(dev, 0);
 138
 139         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 140
 141         return IRQ_HANDLED;
 142 }
 143
 144 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 145 {
 146         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 147         unsigned int value;
 148
 149         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 150         value &= ~DCU_INT_MASK_VBLANK;
 151         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 152
 153         return 0;
 154 }
 155
 156 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
 157                                        unsigned int pipe)
 158 {
 159         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 160         unsigned int value;
 161
 162         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 163         value |= DCU_INT_MASK_VBLANK;
 164         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 165 }
 166
 167 static void fsl_dcu_drm_lastclose(struct drm_device *dev)
 168 {
 169         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 170
 171         drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
 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         .lastclose              = fsl_dcu_drm_lastclose,
 192         .load                   = fsl_dcu_load,
 193         .unload                 = fsl_dcu_unload,
 194         .irq_handler            = fsl_dcu_drm_irq,
 195         .get_vblank_counter     = drm_vblank_no_hw_counter,
 196         .enable_vblank          = fsl_dcu_drm_enable_vblank,
 197         .disable_vblank         = fsl_dcu_drm_disable_vblank,
 198         .gem_free_object_unlocked = 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                   = "20160425",
 216         .major                  = 1,
 217         .minor                  = 1,
 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         disable_irq(fsl_dev->irq);
 229         drm_kms_helper_poll_disable(fsl_dev->drm);
 230
 231         console_lock();
 232         drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 1);
 233         console_unlock();
 234
 235         fsl_dev->state = drm_atomic_helper_suspend(fsl_dev->drm);
 236         if (IS_ERR(fsl_dev->state)) {
 237                 console_lock();
 238                 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
 239                 console_unlock();
 240
 241                 drm_kms_helper_poll_enable(fsl_dev->drm);
 242                 enable_irq(fsl_dev->irq);
 243                 return PTR_ERR(fsl_dev->state);
 244         }
 245
 246         clk_disable_unprepare(fsl_dev->pix_clk);
 247         clk_disable_unprepare(fsl_dev->clk);
 248
 249         return 0;
 250 }
 251
 252 static int fsl_dcu_drm_pm_resume(struct device *dev)
 253 {
 254         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 255         int ret;
 256
 257         if (!fsl_dev)
 258                 return 0;
 259
 260         ret = clk_prepare_enable(fsl_dev->clk);
 261         if (ret < 0) {
 262                 dev_err(dev, "failed to enable dcu clk\n");
 263                 return ret;
 264         }
 265
 266         if (fsl_dev->tcon)
 267                 fsl_tcon_bypass_enable(fsl_dev->tcon);
 268         fsl_dcu_drm_init_planes(fsl_dev->drm);
 269         drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
 270
 271         console_lock();
 272         drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
 273         console_unlock();
 274
 275         drm_kms_helper_poll_enable(fsl_dev->drm);
 276         enable_irq(fsl_dev->irq);
 277
 278         return 0;
 279 }
 280 #endif
 281
 282 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 283         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 284 };
 285
 286 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 287         .name = "ls1021a",
 288         .total_layer = 16,
 289         .max_layer = 4,
 290         .layer_regs = LS1021A_LAYER_REG_NUM,
 291 };
 292
 293 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 294         .name = "vf610",
 295         .total_layer = 64,
 296         .max_layer = 6,
 297         .layer_regs = VF610_LAYER_REG_NUM,
 298 };
 299
 300 static const struct of_device_id fsl_dcu_of_match[] = {
 301         {
 302                 .compatible = "fsl,ls1021a-dcu",
 303                 .data = &fsl_dcu_ls1021a_data,
 304         }, {
 305                 .compatible = "fsl,vf610-dcu",
 306                 .data = &fsl_dcu_vf610_data,
 307         }, {
 308         },
 309 };
 310 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 311
 312 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 313 {
 314         struct fsl_dcu_drm_device *fsl_dev;
 315         struct drm_device *drm;
 316         struct device *dev = &pdev->dev;
 317         struct resource *res;
 318         void __iomem *base;
 319         struct drm_driver *driver = &fsl_dcu_drm_driver;
 320         struct clk *pix_clk_in;
 321         char pix_clk_name[32];
 322         const char *pix_clk_in_name;
 323         const struct of_device_id *id;
 324         int ret;
 325         u8 div_ratio_shift = 0;
 326
 327         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 328         if (!fsl_dev)
 329                 return -ENOMEM;
 330
 331         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 332         if (!id)
 333                 return -ENODEV;
 334         fsl_dev->soc = id->data;
 335
 336         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 337         if (!res) {
 338                 dev_err(dev, "could not get memory IO resource\n");
 339                 return -ENODEV;
 340         }
 341
 342         base = devm_ioremap_resource(dev, res);
 343         if (IS_ERR(base)) {
 344                 ret = PTR_ERR(base);
 345                 return ret;
 346         }
 347
 348         fsl_dev->irq = platform_get_irq(pdev, 0);
 349         if (fsl_dev->irq < 0) {
 350                 dev_err(dev, "failed to get irq\n");
 351                 return -ENXIO;
 352         }
 353
 354         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 355                         &fsl_dcu_regmap_config);
 356         if (IS_ERR(fsl_dev->regmap)) {
 357                 dev_err(dev, "regmap init failed\n");
 358                 return PTR_ERR(fsl_dev->regmap);
 359         }
 360
 361         fsl_dev->clk = devm_clk_get(dev, "dcu");
 362         if (IS_ERR(fsl_dev->clk)) {
 363                 dev_err(dev, "failed to get dcu clock\n");
 364                 return PTR_ERR(fsl_dev->clk);
 365         }
 366         ret = clk_prepare_enable(fsl_dev->clk);
 367         if (ret < 0) {
 368                 dev_err(dev, "failed to enable dcu clk\n");
 369                 return ret;
 370         }
 371
 372         pix_clk_in = devm_clk_get(dev, "pix");
 373         if (IS_ERR(pix_clk_in)) {
 374                 /* legancy binding, use dcu clock as pixel clock input */
 375                 pix_clk_in = fsl_dev->clk;
 376         }
 377
 378         if (of_property_read_bool(dev->of_node, "big-endian"))
 379                 div_ratio_shift = 24;
 380
 381         pix_clk_in_name = __clk_get_name(pix_clk_in);
 382         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 383         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 384                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 385                         div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 386         if (IS_ERR(fsl_dev->pix_clk)) {
 387                 dev_err(dev, "failed to register pix clk\n");
 388                 ret = PTR_ERR(fsl_dev->pix_clk);
 389                 goto disable_clk;
 390         }
 391
 392         fsl_dev->tcon = fsl_tcon_init(dev);
 393
 394         drm = drm_dev_alloc(driver, dev);
 395         if (IS_ERR(drm)) {
 396                 ret = PTR_ERR(drm);
 397                 goto unregister_pix_clk;
 398         }
 399
 400         fsl_dev->dev = dev;
 401         fsl_dev->drm = drm;
 402         fsl_dev->np = dev->of_node;
 403         drm->dev_private = fsl_dev;
 404         dev_set_drvdata(dev, fsl_dev);
 405
 406         ret = drm_dev_register(drm, 0);
 407         if (ret < 0)
 408                 goto unref;
 409
 410         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 411                  driver->major, driver->minor, driver->patchlevel,
 412                  driver->date, drm->primary->index);
 413
 414         return 0;
 415
 416 unref:
 417         drm_dev_unref(drm);
 418 unregister_pix_clk:
 419         clk_unregister(fsl_dev->pix_clk);
 420 disable_clk:
 421         clk_disable_unprepare(fsl_dev->clk);
 422         return ret;
 423 }
 424
 425 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 426 {
 427         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 428
 429         clk_disable_unprepare(fsl_dev->clk);
 430         clk_unregister(fsl_dev->pix_clk);
 431         drm_put_dev(fsl_dev->drm);
 432
 433         return 0;
 434 }
 435
 436 static struct platform_driver fsl_dcu_drm_platform_driver = {
 437         .probe          = fsl_dcu_drm_probe,
 438         .remove         = fsl_dcu_drm_remove,
 439         .driver         = {
 440                 .name   = "fsl-dcu",
 441                 .pm     = &fsl_dcu_drm_pm_ops,
 442                 .of_match_table = fsl_dcu_of_match,
 443         },
 444 };
 445
 446 module_platform_driver(fsl_dcu_drm_platform_driver);
 447
 448 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 449 MODULE_LICENSE("GPL");