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 int legacyfb_depth = 24;
  36 module_param(legacyfb_depth, int, 0444);
  37
  38 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  39 {
  40         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  41                 return true;
  42
  43         return false;
  44 }
  45
  46 static const struct regmap_config fsl_dcu_regmap_config = {
  47         .reg_bits = 32,
  48         .reg_stride = 4,
  49         .val_bits = 32,
  50
  51         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  52 };
  53
  54 static void fsl_dcu_irq_uninstall(struct drm_device *dev)
  55 {
  56         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  57
  58         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
  59         regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
  60 }
  61
  62 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
  63 {
  64         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  65         int ret;
  66
  67         ret = fsl_dcu_drm_modeset_init(fsl_dev);
  68         if (ret < 0) {
  69                 dev_err(dev->dev, "failed to initialize mode setting\n");
  70                 return ret;
  71         }
  72
  73         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
  74         if (ret < 0) {
  75                 dev_err(dev->dev, "failed to initialize vblank\n");
  76                 goto done;
  77         }
  78
  79         ret = drm_irq_install(dev, fsl_dev->irq);
  80         if (ret < 0) {
  81                 dev_err(dev->dev, "failed to install IRQ handler\n");
  82                 goto done;
  83         }
  84
  85         if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
  86             legacyfb_depth != 32) {
  87                 dev_warn(dev->dev,
  88                         "Invalid legacyfb_depth.  Defaulting to 24bpp\n");
  89                 legacyfb_depth = 24;
  90         }
  91         fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1);
  92         if (IS_ERR(fsl_dev->fbdev)) {
  93                 ret = PTR_ERR(fsl_dev->fbdev);
  94                 fsl_dev->fbdev = NULL;
  95                 goto done;
  96         }
  97
  98         return 0;
  99 done:
 100         drm_kms_helper_poll_fini(dev);
 101
 102         if (fsl_dev->fbdev)
 103                 drm_fbdev_cma_fini(fsl_dev->fbdev);
 104
 105         drm_mode_config_cleanup(dev);
 106         drm_irq_uninstall(dev);
 107         dev->dev_private = NULL;
 108
 109         return ret;
 110 }
 111
 112 static void fsl_dcu_unload(struct drm_device *dev)
 113 {
 114         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 115
 116         drm_atomic_helper_shutdown(dev);
 117         drm_kms_helper_poll_fini(dev);
 118
 119         if (fsl_dev->fbdev)
 120                 drm_fbdev_cma_fini(fsl_dev->fbdev);
 121
 122         drm_mode_config_cleanup(dev);
 123         drm_irq_uninstall(dev);
 124
 125         dev->dev_private = NULL;
 126 }
 127
 128 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 129 {
 130         struct drm_device *dev = arg;
 131         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 132         unsigned int int_status;
 133         int ret;
 134
 135         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 136         if (ret) {
 137                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
 138                 return IRQ_NONE;
 139         }
 140
 141         if (int_status & DCU_INT_STATUS_VBLANK)
 142                 drm_handle_vblank(dev, 0);
 143
 144         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 145
 146         return IRQ_HANDLED;
 147 }
 148
 149 static void fsl_dcu_drm_lastclose(struct drm_device *dev)
 150 {
 151         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 152
 153         drm_fbdev_cma_restore_mode(fsl_dev->fbdev);
 154 }
 155
 156 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
 157
 158 static struct drm_driver fsl_dcu_drm_driver = {
 159         .driver_features        = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET
 160                                 | DRIVER_PRIME | DRIVER_ATOMIC,
 161         .lastclose              = fsl_dcu_drm_lastclose,
 162         .load                   = fsl_dcu_load,
 163         .unload                 = fsl_dcu_unload,
 164         .irq_handler            = fsl_dcu_drm_irq,
 165         .irq_preinstall         = fsl_dcu_irq_uninstall,
 166         .irq_uninstall          = fsl_dcu_irq_uninstall,
 167         .gem_free_object_unlocked = drm_gem_cma_free_object,
 168         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 169         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 170         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 171         .gem_prime_import       = drm_gem_prime_import,
 172         .gem_prime_export       = drm_gem_prime_export,
 173         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 174         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 175         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 176         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 177         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 178         .dumb_create            = drm_gem_cma_dumb_create,
 179         .fops                   = &fsl_dcu_drm_fops,
 180         .name                   = "fsl-dcu-drm",
 181         .desc                   = "Freescale DCU DRM",
 182         .date                   = "20160425",
 183         .major                  = 1,
 184         .minor                  = 1,
 185 };
 186
 187 #ifdef CONFIG_PM_SLEEP
 188 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 189 {
 190         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 191
 192         if (!fsl_dev)
 193                 return 0;
 194
 195         disable_irq(fsl_dev->irq);
 196         drm_kms_helper_poll_disable(fsl_dev->drm);
 197
 198         console_lock();
 199         drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 1);
 200         console_unlock();
 201
 202         fsl_dev->state = drm_atomic_helper_suspend(fsl_dev->drm);
 203         if (IS_ERR(fsl_dev->state)) {
 204                 console_lock();
 205                 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
 206                 console_unlock();
 207
 208                 drm_kms_helper_poll_enable(fsl_dev->drm);
 209                 enable_irq(fsl_dev->irq);
 210                 return PTR_ERR(fsl_dev->state);
 211         }
 212
 213         clk_disable_unprepare(fsl_dev->clk);
 214
 215         return 0;
 216 }
 217
 218 static int fsl_dcu_drm_pm_resume(struct device *dev)
 219 {
 220         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 221         int ret;
 222
 223         if (!fsl_dev)
 224                 return 0;
 225
 226         ret = clk_prepare_enable(fsl_dev->clk);
 227         if (ret < 0) {
 228                 dev_err(dev, "failed to enable dcu clk\n");
 229                 return ret;
 230         }
 231
 232         if (fsl_dev->tcon)
 233                 fsl_tcon_bypass_enable(fsl_dev->tcon);
 234         fsl_dcu_drm_init_planes(fsl_dev->drm);
 235         enable_irq(fsl_dev->irq);
 236         drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state);
 237
 238         console_lock();
 239         drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0);
 240         console_unlock();
 241
 242         drm_kms_helper_poll_enable(fsl_dev->drm);
 243
 244         return 0;
 245 }
 246 #endif
 247
 248 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 249         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 250 };
 251
 252 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 253         .name = "ls1021a",
 254         .total_layer = 16,
 255         .max_layer = 4,
 256         .layer_regs = LS1021A_LAYER_REG_NUM,
 257 };
 258
 259 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 260         .name = "vf610",
 261         .total_layer = 64,
 262         .max_layer = 6,
 263         .layer_regs = VF610_LAYER_REG_NUM,
 264 };
 265
 266 static const struct of_device_id fsl_dcu_of_match[] = {
 267         {
 268                 .compatible = "fsl,ls1021a-dcu",
 269                 .data = &fsl_dcu_ls1021a_data,
 270         }, {
 271                 .compatible = "fsl,vf610-dcu",
 272                 .data = &fsl_dcu_vf610_data,
 273         }, {
 274         },
 275 };
 276 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 277
 278 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 279 {
 280         struct fsl_dcu_drm_device *fsl_dev;
 281         struct drm_device *drm;
 282         struct device *dev = &pdev->dev;
 283         struct resource *res;
 284         void __iomem *base;
 285         struct drm_driver *driver = &fsl_dcu_drm_driver;
 286         struct clk *pix_clk_in;
 287         char pix_clk_name[32];
 288         const char *pix_clk_in_name;
 289         const struct of_device_id *id;
 290         int ret;
 291         u8 div_ratio_shift = 0;
 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         base = devm_ioremap_resource(dev, res);
 304         if (IS_ERR(base)) {
 305                 ret = PTR_ERR(base);
 306                 return ret;
 307         }
 308
 309         fsl_dev->irq = platform_get_irq(pdev, 0);
 310         if (fsl_dev->irq < 0) {
 311                 dev_err(dev, "failed to get irq\n");
 312                 return fsl_dev->irq;
 313         }
 314
 315         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 316                         &fsl_dcu_regmap_config);
 317         if (IS_ERR(fsl_dev->regmap)) {
 318                 dev_err(dev, "regmap init failed\n");
 319                 return PTR_ERR(fsl_dev->regmap);
 320         }
 321
 322         fsl_dev->clk = devm_clk_get(dev, "dcu");
 323         if (IS_ERR(fsl_dev->clk)) {
 324                 dev_err(dev, "failed to get dcu clock\n");
 325                 return PTR_ERR(fsl_dev->clk);
 326         }
 327         ret = clk_prepare_enable(fsl_dev->clk);
 328         if (ret < 0) {
 329                 dev_err(dev, "failed to enable dcu clk\n");
 330                 return ret;
 331         }
 332
 333         pix_clk_in = devm_clk_get(dev, "pix");
 334         if (IS_ERR(pix_clk_in)) {
 335                 /* legancy binding, use dcu clock as pixel clock input */
 336                 pix_clk_in = fsl_dev->clk;
 337         }
 338
 339         if (of_property_read_bool(dev->of_node, "big-endian"))
 340                 div_ratio_shift = 24;
 341
 342         pix_clk_in_name = __clk_get_name(pix_clk_in);
 343         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 344         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 345                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 346                         div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 347         if (IS_ERR(fsl_dev->pix_clk)) {
 348                 dev_err(dev, "failed to register pix clk\n");
 349                 ret = PTR_ERR(fsl_dev->pix_clk);
 350                 goto disable_clk;
 351         }
 352
 353         fsl_dev->tcon = fsl_tcon_init(dev);
 354
 355         drm = drm_dev_alloc(driver, dev);
 356         if (IS_ERR(drm)) {
 357                 ret = PTR_ERR(drm);
 358                 goto unregister_pix_clk;
 359         }
 360
 361         fsl_dev->dev = dev;
 362         fsl_dev->drm = drm;
 363         fsl_dev->np = dev->of_node;
 364         drm->dev_private = fsl_dev;
 365         dev_set_drvdata(dev, fsl_dev);
 366
 367         ret = drm_dev_register(drm, 0);
 368         if (ret < 0)
 369                 goto unref;
 370
 371         return 0;
 372
 373 unref:
 374         drm_dev_unref(drm);
 375 unregister_pix_clk:
 376         clk_unregister(fsl_dev->pix_clk);
 377 disable_clk:
 378         clk_disable_unprepare(fsl_dev->clk);
 379         return ret;
 380 }
 381
 382 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 383 {
 384         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 385
 386         drm_dev_unregister(fsl_dev->drm);
 387         drm_dev_unref(fsl_dev->drm);
 388         clk_disable_unprepare(fsl_dev->clk);
 389         clk_unregister(fsl_dev->pix_clk);
 390
 391         return 0;
 392 }
 393
 394 static struct platform_driver fsl_dcu_drm_platform_driver = {
 395         .probe          = fsl_dcu_drm_probe,
 396         .remove         = fsl_dcu_drm_remove,
 397         .driver         = {
 398                 .name   = "fsl-dcu",
 399                 .pm     = &fsl_dcu_drm_pm_ops,
 400                 .of_match_table = fsl_dcu_of_match,
 401         },
 402 };
 403
 404 module_platform_driver(fsl_dcu_drm_platform_driver);
 405
 406 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 407 MODULE_LICENSE("GPL");