drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2015 Freescale Semiconductor, Inc.
   4  *
   5  * Freescale DCU drm device driver
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/clk-provider.h>
  10 #include <linux/console.h>
  11 #include <linux/io.h>
  12 #include <linux/mfd/syscon.h>
  13 #include <linux/mm.h>
  14 #include <linux/module.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pm.h>
  18 #include <linux/pm_runtime.h>
  19 #include <linux/regmap.h>
  20
  21 #include <drm/drm_atomic_helper.h>
  22 #include <drm/drm_drv.h>
  23 #include <drm/drm_fb_cma_helper.h>
  24 #include <drm/drm_fb_helper.h>
  25 #include <drm/drm_gem_cma_helper.h>
  26 #include <drm/drm_irq.h>
  27 #include <drm/drm_modeset_helper.h>
  28 #include <drm/drm_probe_helper.h>
  29 #include <drm/drm_vblank.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
  92         return 0;
  93 done:
  94         drm_kms_helper_poll_fini(dev);
  95
  96         drm_mode_config_cleanup(dev);
  97         drm_irq_uninstall(dev);
  98         dev->dev_private = NULL;
  99
 100         return ret;
 101 }
 102
 103 static void fsl_dcu_unload(struct drm_device *dev)
 104 {
 105         drm_atomic_helper_shutdown(dev);
 106         drm_kms_helper_poll_fini(dev);
 107
 108         drm_mode_config_cleanup(dev);
 109         drm_irq_uninstall(dev);
 110
 111         dev->dev_private = NULL;
 112 }
 113
 114 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
 115 {
 116         struct drm_device *dev = arg;
 117         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 118         unsigned int int_status;
 119         int ret;
 120
 121         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
 122         if (ret) {
 123                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
 124                 return IRQ_NONE;
 125         }
 126
 127         if (int_status & DCU_INT_STATUS_VBLANK)
 128                 drm_handle_vblank(dev, 0);
 129
 130         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
 131
 132         return IRQ_HANDLED;
 133 }
 134
 135 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops);
 136
 137 static struct drm_driver fsl_dcu_drm_driver = {
 138         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 139         .load                   = fsl_dcu_load,
 140         .unload                 = fsl_dcu_unload,
 141         .irq_handler            = fsl_dcu_drm_irq,
 142         .irq_preinstall         = fsl_dcu_irq_uninstall,
 143         .irq_uninstall          = fsl_dcu_irq_uninstall,
 144         DRM_GEM_CMA_DRIVER_OPS,
 145         .fops                   = &fsl_dcu_drm_fops,
 146         .name                   = "fsl-dcu-drm",
 147         .desc                   = "Freescale DCU DRM",
 148         .date                   = "20160425",
 149         .major                  = 1,
 150         .minor                  = 1,
 151 };
 152
 153 #ifdef CONFIG_PM_SLEEP
 154 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 155 {
 156         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 157         int ret;
 158
 159         if (!fsl_dev)
 160                 return 0;
 161
 162         disable_irq(fsl_dev->irq);
 163
 164         ret = drm_mode_config_helper_suspend(fsl_dev->drm);
 165         if (ret) {
 166                 enable_irq(fsl_dev->irq);
 167                 return ret;
 168         }
 169
 170         clk_disable_unprepare(fsl_dev->clk);
 171
 172         return 0;
 173 }
 174
 175 static int fsl_dcu_drm_pm_resume(struct device *dev)
 176 {
 177         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 178         int ret;
 179
 180         if (!fsl_dev)
 181                 return 0;
 182
 183         ret = clk_prepare_enable(fsl_dev->clk);
 184         if (ret < 0) {
 185                 dev_err(dev, "failed to enable dcu clk\n");
 186                 return ret;
 187         }
 188
 189         if (fsl_dev->tcon)
 190                 fsl_tcon_bypass_enable(fsl_dev->tcon);
 191         fsl_dcu_drm_init_planes(fsl_dev->drm);
 192         enable_irq(fsl_dev->irq);
 193
 194         drm_mode_config_helper_resume(fsl_dev->drm);
 195
 196         return 0;
 197 }
 198 #endif
 199
 200 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 201         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 202 };
 203
 204 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 205         .name = "ls1021a",
 206         .total_layer = 16,
 207         .max_layer = 4,
 208         .layer_regs = LS1021A_LAYER_REG_NUM,
 209 };
 210
 211 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 212         .name = "vf610",
 213         .total_layer = 64,
 214         .max_layer = 6,
 215         .layer_regs = VF610_LAYER_REG_NUM,
 216 };
 217
 218 static const struct of_device_id fsl_dcu_of_match[] = {
 219         {
 220                 .compatible = "fsl,ls1021a-dcu",
 221                 .data = &fsl_dcu_ls1021a_data,
 222         }, {
 223                 .compatible = "fsl,vf610-dcu",
 224                 .data = &fsl_dcu_vf610_data,
 225         }, {
 226         },
 227 };
 228 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 229
 230 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 231 {
 232         struct fsl_dcu_drm_device *fsl_dev;
 233         struct drm_device *drm;
 234         struct device *dev = &pdev->dev;
 235         struct resource *res;
 236         void __iomem *base;
 237         struct drm_driver *driver = &fsl_dcu_drm_driver;
 238         struct clk *pix_clk_in;
 239         char pix_clk_name[32];
 240         const char *pix_clk_in_name;
 241         const struct of_device_id *id;
 242         int ret;
 243         u8 div_ratio_shift = 0;
 244
 245         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 246         if (!fsl_dev)
 247                 return -ENOMEM;
 248
 249         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 250         if (!id)
 251                 return -ENODEV;
 252         fsl_dev->soc = id->data;
 253
 254         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 255         base = devm_ioremap_resource(dev, res);
 256         if (IS_ERR(base)) {
 257                 ret = PTR_ERR(base);
 258                 return ret;
 259         }
 260
 261         fsl_dev->irq = platform_get_irq(pdev, 0);
 262         if (fsl_dev->irq < 0) {
 263                 dev_err(dev, "failed to get irq\n");
 264                 return fsl_dev->irq;
 265         }
 266
 267         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 268                         &fsl_dcu_regmap_config);
 269         if (IS_ERR(fsl_dev->regmap)) {
 270                 dev_err(dev, "regmap init failed\n");
 271                 return PTR_ERR(fsl_dev->regmap);
 272         }
 273
 274         fsl_dev->clk = devm_clk_get(dev, "dcu");
 275         if (IS_ERR(fsl_dev->clk)) {
 276                 dev_err(dev, "failed to get dcu clock\n");
 277                 return PTR_ERR(fsl_dev->clk);
 278         }
 279         ret = clk_prepare_enable(fsl_dev->clk);
 280         if (ret < 0) {
 281                 dev_err(dev, "failed to enable dcu clk\n");
 282                 return ret;
 283         }
 284
 285         pix_clk_in = devm_clk_get(dev, "pix");
 286         if (IS_ERR(pix_clk_in)) {
 287                 /* legancy binding, use dcu clock as pixel clock input */
 288                 pix_clk_in = fsl_dev->clk;
 289         }
 290
 291         if (of_property_read_bool(dev->of_node, "big-endian"))
 292                 div_ratio_shift = 24;
 293
 294         pix_clk_in_name = __clk_get_name(pix_clk_in);
 295         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 296         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 297                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 298                         div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 299         if (IS_ERR(fsl_dev->pix_clk)) {
 300                 dev_err(dev, "failed to register pix clk\n");
 301                 ret = PTR_ERR(fsl_dev->pix_clk);
 302                 goto disable_clk;
 303         }
 304
 305         fsl_dev->tcon = fsl_tcon_init(dev);
 306
 307         drm = drm_dev_alloc(driver, dev);
 308         if (IS_ERR(drm)) {
 309                 ret = PTR_ERR(drm);
 310                 goto unregister_pix_clk;
 311         }
 312
 313         fsl_dev->dev = dev;
 314         fsl_dev->drm = drm;
 315         fsl_dev->np = dev->of_node;
 316         drm->dev_private = fsl_dev;
 317         dev_set_drvdata(dev, fsl_dev);
 318
 319         ret = drm_dev_register(drm, 0);
 320         if (ret < 0)
 321                 goto put;
 322
 323         drm_fbdev_generic_setup(drm, legacyfb_depth);
 324
 325         return 0;
 326
 327 put:
 328         drm_dev_put(drm);
 329 unregister_pix_clk:
 330         clk_unregister(fsl_dev->pix_clk);
 331 disable_clk:
 332         clk_disable_unprepare(fsl_dev->clk);
 333         return ret;
 334 }
 335
 336 static int fsl_dcu_drm_remove(struct platform_device *pdev)
 337 {
 338         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 339
 340         drm_dev_unregister(fsl_dev->drm);
 341         drm_dev_put(fsl_dev->drm);
 342         clk_disable_unprepare(fsl_dev->clk);
 343         clk_unregister(fsl_dev->pix_clk);
 344
 345         return 0;
 346 }
 347
 348 static struct platform_driver fsl_dcu_drm_platform_driver = {
 349         .probe          = fsl_dcu_drm_probe,
 350         .remove         = fsl_dcu_drm_remove,
 351         .driver         = {
 352                 .name   = "fsl-dcu",
 353                 .pm     = &fsl_dcu_drm_pm_ops,
 354                 .of_match_table = fsl_dcu_of_match,
 355         },
 356 };
 357
 358 module_platform_driver(fsl_dcu_drm_platform_driver);
 359
 360 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 361 MODULE_LICENSE("GPL");