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 #include <drm/drm_modeset_helper.h>
  31
  32 #include "fsl_dcu_drm_crtc.h"
  33 #include "fsl_dcu_drm_drv.h"
  34 #include "fsl_tcon.h"
  35
  36 static int legacyfb_depth = 24;
  37 module_param(legacyfb_depth, int, 0444);
  38
  39 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  40 {
  41         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  42                 return true;
  43
  44         return false;
  45 }
  46
  47 static const struct regmap_config fsl_dcu_regmap_config = {
  48         .reg_bits = 32,
  49         .reg_stride = 4,
  50         .val_bits = 32,
  51
  52         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  53 };
  54
  55 static void fsl_dcu_irq_uninstall(struct drm_device *dev)
  56 {
  57         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  58
  59         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
  60         regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
  61 }
  62
  63 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
  64 {
  65         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  66         int ret;
  67
  68         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  69         if (ret < 0) {
  70                 dev_err(dev->dev, "failed to initialize mode setting\n");
  71                 return ret;
  72         }
  73
  74         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
  75         if (ret < 0) {
  76                 dev_err(dev->dev, "failed to initialize vblank\n");
  77                 goto done;
  78         }
  79
  80         ret = drm_irq_install(dev, fsl_dev->irq);
  81         if (ret < 0) {
  82                 dev_err(dev->dev, "failed to install IRQ handler\n");
  83                 goto done;
  84         }
  85
  86         if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
  87             legacyfb_depth != 32) {
  88                 dev_warn(dev->dev,
  89                         "Invalid legacyfb_depth.  Defaulting to 24bpp\n");
  90                 legacyfb_depth = 24;
  91         }
  92         fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1);
  93         if (IS_ERR(fsl_dev->fbdev)) {
  94                 ret = PTR_ERR(fsl_dev->fbdev);
  95                 fsl_dev->fbdev = NULL;
  96                 goto done;
  97         }
  98
  99         return 0;
 100 done:
 101         drm_kms_helper_poll_fini(dev);
 102
 103         if (fsl_dev->fbdev)
 104                 drm_fbdev_cma_fini(fsl_dev->fbdev);
 105
 106         drm_mode_config_cleanup(dev);
 107         drm_irq_uninstall(dev);
 108         dev->dev_private = NULL;
 109
 110         return ret;
 111 }
 112
 113 static void fsl_dcu_unload(struct drm_device *dev)
 114 {
 115         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 116
 117         drm_atomic_helper_shutdown(dev);
 118         drm_kms_helper_poll_fini(dev);
 119
 120         if (fsl_dev->fbdev)
 121                 drm_fbdev_cma_fini(fsl_dev->fbdev);
 122
 123         drm_mode_config_cleanup(dev);
 124         drm_irq_uninstall(dev);
 125
 126         dev->dev_private = NULL;
 127 }
 128
 129 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 130 {
 131         struct drm_device *dev = arg;
 132         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 133         unsigned int int_status;
 134         int ret;
 135
 136         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 137         if (ret) {
 138                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
 139                 return IRQ_NONE;
 140         }
 141
 142         if (int_status & DCU_INT_STATUS_VBLANK)
 143                 drm_handle_vblank(dev, 0);
 144
 145         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 146
 147         return IRQ_HANDLED;
 148 }
 149
 150 static void fsl_dcu_drm_lastclose(struct drm_device *dev)
 151 {
 152         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 153
 154         drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
 155 }
 156
 157 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
 158
 159 static struct drm_driver fsl_dcu_drm_driver = {
 160         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 161                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 162         .lastclose              = fsl_dcu_drm_lastclose,
 163         .load                   = fsl_dcu_load,
 164         .unload                 = fsl_dcu_unload,
 165         .irq_handler            = fsl_dcu_drm_irq,
 166         .irq_preinstall         = fsl_dcu_irq_uninstall,
 167         .irq_uninstall          = fsl_dcu_irq_uninstall,
 168         .gem_free_object_unlocked = drm_gem_cma_free_object,
 169         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 170         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 171         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 172         .gem_prime_import       = drm_gem_prime_import,
 173         .gem_prime_export       = drm_gem_prime_export,
 174         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 175         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 176         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 177         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 178         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 179         .dumb_create            = drm_gem_cma_dumb_create,
 180         .fops                   = &fsl_dcu_drm_fops,
 181         .name                   = "fsl-dcu-drm",
 182         .desc                   = "Freescale DCU DRM",
 183         .date                   = "20160425",
 184         .major                  = 1,
 185         .minor                  = 1,
 186 };
 187
 188 #ifdef CONFIG_PM_SLEEP
 189 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 190 {
 191         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 192         int ret;
 193
 194         if (!fsl_dev)
 195                 return 0;
 196
 197         disable_irq(fsl_dev->irq);
 198
 199         ret = drm_mode_config_helper_suspend(fsl_dev->drm);
 200         if (ret) {
 201                 enable_irq(fsl_dev->irq);
 202                 return ret;
 203         }
 204
 205         clk_disable_unprepare(fsl_dev->clk);
 206
 207         return 0;
 208 }
 209
 210 static int fsl_dcu_drm_pm_resume(struct device *dev)
 211 {
 212         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 213         int ret;
 214
 215         if (!fsl_dev)
 216                 return 0;
 217
 218         ret = clk_prepare_enable(fsl_dev->clk);
 219         if (ret < 0) {
 220                 dev_err(dev, "failed to enable dcu clk\n");
 221                 return ret;
 222         }
 223
 224         if (fsl_dev->tcon)
 225                 fsl_tcon_bypass_enable(fsl_dev->tcon);
 226         fsl_dcu_drm_init_planes(fsl_dev->drm);
 227         enable_irq(fsl_dev->irq);
 228
 229         drm_mode_config_helper_resume(fsl_dev->drm);
 230
 231         return 0;
 232 }
 233 #endif
 234
 235 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 236         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 237 };
 238
 239 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 240         .name = "ls1021a",
 241         .total_layer = 16,
 242         .max_layer = 4,
 243         .layer_regs = LS1021A_LAYER_REG_NUM,
 244 };
 245
 246 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 247         .name = "vf610",
 248         .total_layer = 64,
 249         .max_layer = 6,
 250         .layer_regs = VF610_LAYER_REG_NUM,
 251 };
 252
 253 static const struct of_device_id fsl_dcu_of_match[] = {
 254         {
 255                 .compatible = "fsl,ls1021a-dcu",
 256                 .data = &fsl_dcu_ls1021a_data,
 257         }, {
 258                 .compatible = "fsl,vf610-dcu",
 259                 .data = &fsl_dcu_vf610_data,
 260         }, {
 261         },
 262 };
 263 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 264
 265 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 266 {
 267         struct fsl_dcu_drm_device *fsl_dev;
 268         struct drm_device *drm;
 269         struct device *dev = &pdev->dev;
 270         struct resource *res;
 271         void __iomem *base;
 272         struct drm_driver *driver = &fsl_dcu_drm_driver;
 273         struct clk *pix_clk_in;
 274         char pix_clk_name[32];
 275         const char *pix_clk_in_name;
 276         const struct of_device_id *id;
 277         int ret;
 278         u8 div_ratio_shift = 0;
 279
 280         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 281         if (!fsl_dev)
 282                 return -ENOMEM;
 283
 284         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 285         if (!id)
 286                 return -ENODEV;
 287         fsl_dev->soc = id->data;
 288
 289         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 290         base = devm_ioremap_resource(dev, res);
 291         if (IS_ERR(base)) {
 292                 ret = PTR_ERR(base);
 293                 return ret;
 294         }
 295
 296         fsl_dev->irq = platform_get_irq(pdev, 0);
 297         if (fsl_dev->irq < 0) {
 298                 dev_err(dev, "failed to get irq\n");
 299                 return fsl_dev->irq;
 300         }
 301
 302         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 303                         &fsl_dcu_regmap_config);
 304         if (IS_ERR(fsl_dev->regmap)) {
 305                 dev_err(dev, "regmap init failed\n");
 306                 return PTR_ERR(fsl_dev->regmap);
 307         }
 308
 309         fsl_dev->clk = devm_clk_get(dev, "dcu");
 310         if (IS_ERR(fsl_dev->clk)) {
 311                 dev_err(dev, "failed to get dcu clock\n");
 312                 return PTR_ERR(fsl_dev->clk);
 313         }
 314         ret = clk_prepare_enable(fsl_dev->clk);
 315         if (ret < 0) {
 316                 dev_err(dev, "failed to enable dcu clk\n");
 317                 return ret;
 318         }
 319
 320         pix_clk_in = devm_clk_get(dev, "pix");
 321         if (IS_ERR(pix_clk_in)) {
 322                 /* legancy binding, use dcu clock as pixel clock input */
 323                 pix_clk_in = fsl_dev->clk;
 324         }
 325
 326         if (of_property_read_bool(dev->of_node, "big-endian"))
 327                 div_ratio_shift = 24;
 328
 329         pix_clk_in_name = __clk_get_name(pix_clk_in);
 330         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 331         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 332                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 333                         div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 334         if (IS_ERR(fsl_dev->pix_clk)) {
 335                 dev_err(dev, "failed to register pix clk\n");
 336                 ret = PTR_ERR(fsl_dev->pix_clk);
 337                 goto disable_clk;
 338         }
 339
 340         fsl_dev->tcon = fsl_tcon_init(dev);
 341
 342         drm = drm_dev_alloc(driver, dev);
 343         if (IS_ERR(drm)) {
 344                 ret = PTR_ERR(drm);
 345                 goto unregister_pix_clk;
 346         }
 347
 348         fsl_dev->dev = dev;
 349         fsl_dev->drm = drm;
 350         fsl_dev->np = dev->of_node;
 351         drm->dev_private = fsl_dev;
 352         dev_set_drvdata(dev, fsl_dev);
 353
 354         ret = drm_dev_register(drm, 0);
 355         if (ret < 0)
 356                 goto unref;
 357
 358         return 0;
 359
 360 unref:
 361         drm_dev_unref(drm);
 362 unregister_pix_clk:
 363         clk_unregister(fsl_dev->pix_clk);
 364 disable_clk:
 365         clk_disable_unprepare(fsl_dev->clk);
 366         return ret;
 367 }
 368
 369 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 370 {
 371         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 372
 373         drm_dev_unregister(fsl_dev->drm);
 374         drm_dev_unref(fsl_dev->drm);
 375         clk_disable_unprepare(fsl_dev->clk);
 376         clk_unregister(fsl_dev->pix_clk);
 377
 378         return 0;
 379 }
 380
 381 static struct platform_driver fsl_dcu_drm_platform_driver = {
 382         .probe          = fsl_dcu_drm_probe,
 383         .remove         = fsl_dcu_drm_remove,
 384         .driver         = {
 385                 .name   = "fsl-dcu",
 386                 .pm     = &fsl_dcu_drm_pm_ops,
 387                 .of_match_table = fsl_dcu_of_match,
 388         },
 389 };
 390
 391 module_platform_driver(fsl_dcu_drm_platform_driver);
 392
 393 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 394 MODULE_LICENSE("GPL");