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_RBTREE,
  46
  47         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  48 };
  49
  50 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
  51 {
  52         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  53         int ret;
  54
  55         ret = drm_irq_install(dev, fsl_dev->irq);
  56         if (ret < 0)
  57                 dev_err(dev->dev, "failed to install IRQ handler\n");
  58
  59         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
  60         regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
  61         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  62                      DCU_UPDATE_MODE_READREG);
  63
  64         return ret;
  65 }
  66
  67 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
  68 {
  69         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  70         int ret;
  71
  72         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  73         if (ret < 0) {
  74                 dev_err(dev->dev, "failed to initialize mode setting\n");
  75                 return ret;
  76         }
  77
  78         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
  79         if (ret < 0) {
  80                 dev_err(dev->dev, "failed to initialize vblank\n");
  81                 goto done;
  82         }
  83
  84         ret = fsl_dcu_drm_irq_init(dev);
  85         if (ret < 0)
  86                 goto done;
  87         dev->irq_enabled = true;
  88
  89         fsl_dcu_fbdev_init(dev);
  90
  91         return 0;
  92 done:
  93         drm_kms_helper_poll_fini(dev);
  94
  95         if (fsl_dev->fbdev)
  96                 drm_fbdev_cma_fini(fsl_dev->fbdev);
  97
  98         drm_mode_config_cleanup(dev);
  99         drm_vblank_cleanup(dev);
 100         drm_irq_uninstall(dev);
 101         dev->dev_private = NULL;
 102
 103         return ret;
 104 }
 105
 106 static int fsl_dcu_unload(struct drm_device *dev)
 107 {
 108         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 109
 110         drm_kms_helper_poll_fini(dev);
 111
 112         if (fsl_dev->fbdev)
 113                 drm_fbdev_cma_fini(fsl_dev->fbdev);
 114
 115         drm_mode_config_cleanup(dev);
 116         drm_vblank_cleanup(dev);
 117         drm_irq_uninstall(dev);
 118
 119         dev->dev_private = NULL;
 120
 121         return 0;
 122 }
 123
 124 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 125 {
 126         struct drm_device *dev = arg;
 127         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 128         unsigned int int_status;
 129         int ret;
 130
 131         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 132         if (ret) {
 133                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
 134                 return IRQ_NONE;
 135         }
 136
 137         if (int_status & DCU_INT_STATUS_VBLANK)
 138                 drm_handle_vblank(dev, 0);
 139
 140         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 141         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 142                      DCU_UPDATE_MODE_READREG);
 143
 144         return IRQ_HANDLED;
 145 }
 146
 147 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 148 {
 149         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 150         unsigned int value;
 151
 152         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 153         value &= ~DCU_INT_MASK_VBLANK;
 154         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 155
 156         return 0;
 157 }
 158
 159 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
 160                                        unsigned int pipe)
 161 {
 162         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 163         unsigned int value;
 164
 165         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 166         value |= DCU_INT_MASK_VBLANK;
 167         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 168 }
 169
 170 static void fsl_dcu_drm_lastclose(struct drm_device *dev)
 171 {
 172         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 173
 174         drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
 175 }
 176
 177 static const struct file_operations fsl_dcu_drm_fops = {
 178         .owner          = THIS_MODULE,
 179         .open           = drm_open,
 180         .release        = drm_release,
 181         .unlocked_ioctl = drm_ioctl,
 182 #ifdef CONFIG_COMPAT
 183         .compat_ioctl   = drm_compat_ioctl,
 184 #endif
 185         .poll           = drm_poll,
 186         .read           = drm_read,
 187         .llseek         = no_llseek,
 188         .mmap           = drm_gem_cma_mmap,
 189 };
 190
 191 static struct drm_driver fsl_dcu_drm_driver = {
 192         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 193                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 194         .lastclose              = fsl_dcu_drm_lastclose,
 195         .load                   = fsl_dcu_load,
 196         .unload                 = fsl_dcu_unload,
 197         .irq_handler            = fsl_dcu_drm_irq,
 198         .get_vblank_counter     = drm_vblank_no_hw_counter,
 199         .enable_vblank          = fsl_dcu_drm_enable_vblank,
 200         .disable_vblank         = fsl_dcu_drm_disable_vblank,
 201         .gem_free_object        = drm_gem_cma_free_object,
 202         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 203         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 204         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 205         .gem_prime_import       = drm_gem_prime_import,
 206         .gem_prime_export       = drm_gem_prime_export,
 207         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 208         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 209         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 210         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 211         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 212         .dumb_create            = drm_gem_cma_dumb_create,
 213         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 214         .dumb_destroy           = drm_gem_dumb_destroy,
 215         .fops                   = &fsl_dcu_drm_fops,
 216         .name                   = "fsl-dcu-drm",
 217         .desc                   = "Freescale DCU DRM",
 218         .date                   = "20160425",
 219         .major                  = 1,
 220         .minor                  = 1,
 221 };
 222
 223 #ifdef CONFIG_PM_SLEEP
 224 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 225 {
 226         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 227
 228         if (!fsl_dev)
 229                 return 0;
 230
 231         drm_kms_helper_poll_disable(fsl_dev->drm);
 232         regcache_cache_only(fsl_dev->regmap, true);
 233         regcache_mark_dirty(fsl_dev->regmap);
 234         clk_disable(fsl_dev->clk);
 235         clk_unprepare(fsl_dev->clk);
 236
 237         return 0;
 238 }
 239
 240 static int fsl_dcu_drm_pm_resume(struct device *dev)
 241 {
 242         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 243         int ret;
 244
 245         if (!fsl_dev)
 246                 return 0;
 247
 248         ret = clk_enable(fsl_dev->clk);
 249         if (ret < 0) {
 250                 dev_err(dev, "failed to enable dcu clk\n");
 251                 clk_unprepare(fsl_dev->clk);
 252                 return ret;
 253         }
 254         ret = clk_prepare(fsl_dev->clk);
 255         if (ret < 0) {
 256                 dev_err(dev, "failed to prepare dcu clk\n");
 257                 return ret;
 258         }
 259
 260         drm_kms_helper_poll_enable(fsl_dev->drm);
 261         regcache_cache_only(fsl_dev->regmap, false);
 262         regcache_sync(fsl_dev->regmap);
 263
 264         return 0;
 265 }
 266 #endif
 267
 268 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 269         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 270 };
 271
 272 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 273         .name = "ls1021a",
 274         .total_layer = 16,
 275         .max_layer = 4,
 276 };
 277
 278 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 279         .name = "vf610",
 280         .total_layer = 64,
 281         .max_layer = 6,
 282 };
 283
 284 static const struct of_device_id fsl_dcu_of_match[] = {
 285         {
 286                 .compatible = "fsl,ls1021a-dcu",
 287                 .data = &fsl_dcu_ls1021a_data,
 288         }, {
 289                 .compatible = "fsl,vf610-dcu",
 290                 .data = &fsl_dcu_vf610_data,
 291         }, {
 292         },
 293 };
 294 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 295
 296 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 297 {
 298         struct fsl_dcu_drm_device *fsl_dev;
 299         struct drm_device *drm;
 300         struct device *dev = &pdev->dev;
 301         struct resource *res;
 302         void __iomem *base;
 303         struct drm_driver *driver = &fsl_dcu_drm_driver;
 304         struct clk *pix_clk_in;
 305         char pix_clk_name[32];
 306         const char *pix_clk_in_name;
 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         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 315         if (!id)
 316                 return -ENODEV;
 317         fsl_dev->soc = id->data;
 318
 319         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 320         if (!res) {
 321                 dev_err(dev, "could not get memory IO resource\n");
 322                 return -ENODEV;
 323         }
 324
 325         base = devm_ioremap_resource(dev, res);
 326         if (IS_ERR(base)) {
 327                 ret = PTR_ERR(base);
 328                 return ret;
 329         }
 330
 331         fsl_dev->irq = platform_get_irq(pdev, 0);
 332         if (fsl_dev->irq < 0) {
 333                 dev_err(dev, "failed to get irq\n");
 334                 return -ENXIO;
 335         }
 336
 337         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 338                         &fsl_dcu_regmap_config);
 339         if (IS_ERR(fsl_dev->regmap)) {
 340                 dev_err(dev, "regmap init failed\n");
 341                 return PTR_ERR(fsl_dev->regmap);
 342         }
 343
 344         fsl_dev->clk = devm_clk_get(dev, "dcu");
 345         if (IS_ERR(fsl_dev->clk)) {
 346                 dev_err(dev, "failed to get dcu clock\n");
 347                 return PTR_ERR(fsl_dev->clk);
 348         }
 349         ret = clk_prepare_enable(fsl_dev->clk);
 350         if (ret < 0) {
 351                 dev_err(dev, "failed to enable dcu clk\n");
 352                 return ret;
 353         }
 354
 355         pix_clk_in = devm_clk_get(dev, "pix");
 356         if (IS_ERR(pix_clk_in)) {
 357                 /* legancy binding, use dcu clock as pixel clock input */
 358                 pix_clk_in = fsl_dev->clk;
 359         }
 360
 361         pix_clk_in_name = __clk_get_name(pix_clk_in);
 362         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 363         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 364                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 365                         0, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 366         if (IS_ERR(fsl_dev->pix_clk)) {
 367                 dev_err(dev, "failed to register pix clk\n");
 368                 ret = PTR_ERR(fsl_dev->pix_clk);
 369                 goto disable_clk;
 370         }
 371
 372         ret = clk_prepare_enable(fsl_dev->pix_clk);
 373         if (ret < 0) {
 374                 dev_err(dev, "failed to enable pix clk\n");
 375                 goto unregister_pix_clk;
 376         }
 377
 378         fsl_dev->tcon = fsl_tcon_init(dev);
 379
 380         drm = drm_dev_alloc(driver, dev);
 381         if (!drm) {
 382                 ret = -ENOMEM;
 383                 goto disable_pix_clk;
 384         }
 385
 386         fsl_dev->dev = dev;
 387         fsl_dev->drm = drm;
 388         fsl_dev->np = dev->of_node;
 389         drm->dev_private = fsl_dev;
 390         dev_set_drvdata(dev, fsl_dev);
 391
 392         ret = drm_dev_register(drm, 0);
 393         if (ret < 0)
 394                 goto unref;
 395
 396         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 397                  driver->major, driver->minor, driver->patchlevel,
 398                  driver->date, drm->primary->index);
 399
 400         return 0;
 401
 402 unref:
 403         drm_dev_unref(drm);
 404 disable_pix_clk:
 405         clk_disable_unprepare(fsl_dev->pix_clk);
 406 unregister_pix_clk:
 407         clk_unregister(fsl_dev->pix_clk);
 408 disable_clk:
 409         clk_disable_unprepare(fsl_dev->clk);
 410         return ret;
 411 }
 412
 413 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 414 {
 415         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 416
 417         clk_disable_unprepare(fsl_dev->clk);
 418         clk_disable_unprepare(fsl_dev->pix_clk);
 419         clk_unregister(fsl_dev->pix_clk);
 420         drm_put_dev(fsl_dev->drm);
 421
 422         return 0;
 423 }
 424
 425 static struct platform_driver fsl_dcu_drm_platform_driver = {
 426         .probe          = fsl_dcu_drm_probe,
 427         .remove         = fsl_dcu_drm_remove,
 428         .driver         = {
 429                 .name   = "fsl-dcu",
 430                 .pm     = &fsl_dcu_drm_pm_ops,
 431                 .of_match_table = fsl_dcu_of_match,
 432         },
 433 };
 434
 435 module_platform_driver(fsl_dcu_drm_platform_driver);
 436
 437 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 438 MODULE_LICENSE("GPL");