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 #include "fsl_tcon.h"
  31
  32 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  33 {
  34         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  35                 return true;
  36
  37         return false;
  38 }
  39
  40 static const struct regmap_config fsl_dcu_regmap_config = {
  41         .reg_bits = 32,
  42         .reg_stride = 4,
  43         .val_bits = 32,
  44         .cache_type = REGCACHE_RBTREE,
  45
  46         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  47 };
  48
  49 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
  50 {
  51         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  52         int ret;
  53
  54         ret = drm_irq_install(dev, fsl_dev->irq);
  55         if (ret < 0)
  56                 dev_err(dev->dev, "failed to install IRQ handler\n");
  57
  58         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
  59         regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
  60         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
  61                      DCU_UPDATE_MODE_READREG);
  62
  63         return ret;
  64 }
  65
  66 static int fsl_dcu_load(struct drm_device *drm, unsigned long flags)
  67 {
  68         struct device *dev = drm->dev;
  69         struct fsl_dcu_drm_device *fsl_dev = drm->dev_private;
  70         int ret;
  71
  72         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  73         if (ret < 0) {
  74                 dev_err(dev, "failed to initialize mode setting\n");
  75                 return ret;
  76         }
  77
  78         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
  79         if (ret < 0) {
  80                 dev_err(dev, "failed to initialize vblank\n");
  81                 goto done;
  82         }
  83         drm->vblank_disable_allowed = true;
  84
  85         ret = fsl_dcu_drm_irq_init(drm);
  86         if (ret < 0)
  87                 goto done;
  88         drm->irq_enabled = true;
  89
  90         fsl_dcu_fbdev_init(drm);
  91
  92         return 0;
  93 done:
  94         if (ret) {
  95                 drm_mode_config_cleanup(drm);
  96                 drm_vblank_cleanup(drm);
  97                 drm_irq_uninstall(drm);
  98                 drm->dev_private = NULL;
  99         }
 100
 101         return ret;
 102 }
 103
 104 static int fsl_dcu_unload(struct drm_device *dev)
 105 {
 106         drm_mode_config_cleanup(dev);
 107         drm_vblank_cleanup(dev);
 108         drm_irq_uninstall(dev);
 109
 110         dev->dev_private = NULL;
 111
 112         return 0;
 113 }
 114
 115 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 116 {
 117         struct drm_device *dev = arg;
 118         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 119         unsigned int int_status;
 120         int ret;
 121
 122         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 123         if (ret) {
 124                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
 125                 return IRQ_NONE;
 126         }
 127
 128         if (int_status & DCU_INT_STATUS_VBLANK)
 129                 drm_handle_vblank(dev, 0);
 130
 131         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 132         regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
 133                      DCU_UPDATE_MODE_READREG);
 134
 135         return IRQ_HANDLED;
 136 }
 137
 138 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe)
 139 {
 140         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 141         unsigned int value;
 142
 143         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 144         value &= ~DCU_INT_MASK_VBLANK;
 145         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 146
 147         return 0;
 148 }
 149
 150 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev,
 151                                        unsigned int pipe)
 152 {
 153         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 154         unsigned int value;
 155
 156         regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value);
 157         value |= DCU_INT_MASK_VBLANK;
 158         regmap_write(fsl_dev->regmap, DCU_INT_MASK, value);
 159 }
 160
 161 static const struct file_operations fsl_dcu_drm_fops = {
 162         .owner          = THIS_MODULE,
 163         .open           = drm_open,
 164         .release        = drm_release,
 165         .unlocked_ioctl = drm_ioctl,
 166 #ifdef CONFIG_COMPAT
 167         .compat_ioctl   = drm_compat_ioctl,
 168 #endif
 169         .poll           = drm_poll,
 170         .read           = drm_read,
 171         .llseek         = no_llseek,
 172         .mmap           = drm_gem_cma_mmap,
 173 };
 174
 175 static struct drm_driver fsl_dcu_drm_driver = {
 176         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 177                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 178         .load                   = fsl_dcu_load,
 179         .unload                 = fsl_dcu_unload,
 180         .irq_handler            = fsl_dcu_drm_irq,
 181         .get_vblank_counter     = drm_vblank_no_hw_counter,
 182         .enable_vblank          = fsl_dcu_drm_enable_vblank,
 183         .disable_vblank         = fsl_dcu_drm_disable_vblank,
 184         .gem_free_object        = drm_gem_cma_free_object,
 185         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 186         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 187         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 188         .gem_prime_import       = drm_gem_prime_import,
 189         .gem_prime_export       = drm_gem_prime_export,
 190         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 191         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 192         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 193         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 194         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 195         .dumb_create            = drm_gem_cma_dumb_create,
 196         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 197         .dumb_destroy           = drm_gem_dumb_destroy,
 198         .fops                   = &fsl_dcu_drm_fops,
 199         .name                   = "fsl-dcu-drm",
 200         .desc                   = "Freescale DCU DRM",
 201         .date                   = "20150213",
 202         .major                  = 1,
 203         .minor                  = 0,
 204 };
 205
 206 #ifdef CONFIG_PM_SLEEP
 207 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 208 {
 209         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 210
 211         if (!fsl_dev)
 212                 return 0;
 213
 214         drm_kms_helper_poll_disable(fsl_dev->drm);
 215         regcache_cache_only(fsl_dev->regmap, true);
 216         regcache_mark_dirty(fsl_dev->regmap);
 217         clk_disable(fsl_dev->clk);
 218         clk_unprepare(fsl_dev->clk);
 219
 220         return 0;
 221 }
 222
 223 static int fsl_dcu_drm_pm_resume(struct device *dev)
 224 {
 225         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 226         int ret;
 227
 228         if (!fsl_dev)
 229                 return 0;
 230
 231         ret = clk_enable(fsl_dev->clk);
 232         if (ret < 0) {
 233                 dev_err(dev, "failed to enable dcu clk\n");
 234                 clk_unprepare(fsl_dev->clk);
 235                 return ret;
 236         }
 237         ret = clk_prepare(fsl_dev->clk);
 238         if (ret < 0) {
 239                 dev_err(dev, "failed to prepare dcu clk\n");
 240                 return ret;
 241         }
 242
 243         drm_kms_helper_poll_enable(fsl_dev->drm);
 244         regcache_cache_only(fsl_dev->regmap, false);
 245         regcache_sync(fsl_dev->regmap);
 246
 247         return 0;
 248 }
 249 #endif
 250
 251 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 252         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 253 };
 254
 255 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 256         .name = "ls1021a",
 257         .total_layer = 16,
 258         .max_layer = 4,
 259 };
 260
 261 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 262         .name = "vf610",
 263         .total_layer = 64,
 264         .max_layer = 6,
 265 };
 266
 267 static const struct of_device_id fsl_dcu_of_match[] = {
 268         {
 269                 .compatible = "fsl,ls1021a-dcu",
 270                 .data = &fsl_dcu_ls1021a_data,
 271         }, {
 272                 .compatible = "fsl,vf610-dcu",
 273                 .data = &fsl_dcu_vf610_data,
 274         }, {
 275         },
 276 };
 277 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 278
 279 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 280 {
 281         struct fsl_dcu_drm_device *fsl_dev;
 282         struct drm_device *drm;
 283         struct device *dev = &pdev->dev;
 284         struct resource *res;
 285         void __iomem *base;
 286         struct drm_driver *driver = &fsl_dcu_drm_driver;
 287         struct clk *pix_clk_in;
 288         char pix_clk_name[32];
 289         const char *pix_clk_in_name;
 290         const struct of_device_id *id;
 291         int ret;
 292
 293         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 294         if (!fsl_dev)
 295                 return -ENOMEM;
 296
 297         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 298         if (!id)
 299                 return -ENODEV;
 300         fsl_dev->soc = id->data;
 301
 302         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 303         if (!res) {
 304                 dev_err(dev, "could not get memory IO resource\n");
 305                 return -ENODEV;
 306         }
 307
 308         base = devm_ioremap_resource(dev, res);
 309         if (IS_ERR(base)) {
 310                 ret = PTR_ERR(base);
 311                 return ret;
 312         }
 313
 314         fsl_dev->irq = platform_get_irq(pdev, 0);
 315         if (fsl_dev->irq < 0) {
 316                 dev_err(dev, "failed to get irq\n");
 317                 return -ENXIO;
 318         }
 319
 320         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 321                         &fsl_dcu_regmap_config);
 322         if (IS_ERR(fsl_dev->regmap)) {
 323                 dev_err(dev, "regmap init failed\n");
 324                 return PTR_ERR(fsl_dev->regmap);
 325         }
 326
 327         fsl_dev->clk = devm_clk_get(dev, "dcu");
 328         if (IS_ERR(fsl_dev->clk)) {
 329                 dev_err(dev, "failed to get dcu clock\n");
 330                 return PTR_ERR(fsl_dev->clk);
 331         }
 332         ret = clk_prepare_enable(fsl_dev->clk);
 333         if (ret < 0) {
 334                 dev_err(dev, "failed to enable dcu clk\n");
 335                 return ret;
 336         }
 337
 338         pix_clk_in = devm_clk_get(dev, "pix");
 339         if (IS_ERR(pix_clk_in)) {
 340                 /* legancy binding, use dcu clock as pixel clock input */
 341                 pix_clk_in = fsl_dev->clk;
 342         }
 343
 344         pix_clk_in_name = __clk_get_name(pix_clk_in);
 345         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 346         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 347                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 348                         0, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 349         if (IS_ERR(fsl_dev->pix_clk)) {
 350                 dev_err(dev, "failed to register pix clk\n");
 351                 ret = PTR_ERR(fsl_dev->pix_clk);
 352                 goto disable_clk;
 353         }
 354
 355         ret = clk_prepare_enable(fsl_dev->pix_clk);
 356         if (ret < 0) {
 357                 dev_err(dev, "failed to enable pix clk\n");
 358                 goto unregister_pix_clk;
 359         }
 360
 361         fsl_dev->tcon = fsl_tcon_init(dev);
 362
 363         drm = drm_dev_alloc(driver, dev);
 364         if (!drm) {
 365                 ret = -ENOMEM;
 366                 goto disable_pix_clk;
 367         }
 368
 369         fsl_dev->dev = dev;
 370         fsl_dev->drm = drm;
 371         fsl_dev->np = dev->of_node;
 372         drm->dev_private = fsl_dev;
 373         dev_set_drvdata(dev, fsl_dev);
 374
 375         ret = drm_dev_register(drm, 0);
 376         if (ret < 0)
 377                 goto unref;
 378
 379         DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name,
 380                  driver->major, driver->minor, driver->patchlevel,
 381                  driver->date, drm->primary->index);
 382
 383         return 0;
 384
 385 unref:
 386         drm_dev_unref(drm);
 387 disable_pix_clk:
 388         clk_disable_unprepare(fsl_dev->pix_clk);
 389 unregister_pix_clk:
 390         clk_unregister(fsl_dev->pix_clk);
 391 disable_clk:
 392         clk_disable_unprepare(fsl_dev->clk);
 393         return ret;
 394 }
 395
 396 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 397 {
 398         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 399
 400         clk_disable_unprepare(fsl_dev->clk);
 401         clk_disable_unprepare(fsl_dev->pix_clk);
 402         clk_unregister(fsl_dev->pix_clk);
 403         drm_put_dev(fsl_dev->drm);
 404
 405         return 0;
 406 }
 407
 408 static struct platform_driver fsl_dcu_drm_platform_driver = {
 409         .probe          = fsl_dcu_drm_probe,
 410         .remove         = fsl_dcu_drm_remove,
 411         .driver         = {
 412                 .name   = "fsl-dcu",
 413                 .pm     = &fsl_dcu_drm_pm_ops,
 414                 .of_match_table = fsl_dcu_of_match,
 415         },
 416 };
 417
 418 module_platform_driver(fsl_dcu_drm_platform_driver);
 419
 420 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 421 MODULE_LICENSE("GPL");