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_fbdev_dma.h>
  24 #include <drm/drm_gem_dma_helper.h>
  25 #include <drm/drm_modeset_helper.h>
  26 #include <drm/drm_module.h>
  27 #include <drm/drm_probe_helper.h>
  28 #include <drm/drm_vblank.h>
  29
  30 #include "fsl_dcu_drm_crtc.h"
  31 #include "fsl_dcu_drm_drv.h"
  32 #include "fsl_tcon.h"
  33
  34 static int legacyfb_depth = 24;
  35 module_param(legacyfb_depth, int, 0444);
  36
  37 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
  38 {
  39         if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
  40                 return true;
  41
  42         return false;
  43 }
  44
  45 static const struct regmap_config fsl_dcu_regmap_config = {
  46         .reg_bits = 32,
  47         .reg_stride = 4,
  48         .val_bits = 32,
  49
  50         .volatile_reg = fsl_dcu_drm_is_volatile_reg,
  51 };
  52
  53 static void fsl_dcu_irq_reset(struct drm_device *dev)
  54 {
  55         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  56
  57         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, ~0);
  58         regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
  59 }
  60
  61 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
  62 {
  63         struct drm_device *dev = arg;
  64         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  65         unsigned int int_status;
  66         int ret;
  67
  68         ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status);
  69         if (ret) {
  70                 dev_err(dev->dev, "read DCU_INT_STATUS failed\n");
  71                 return IRQ_NONE;
  72         }
  73
  74         if (int_status & DCU_INT_STATUS_VBLANK)
  75                 drm_handle_vblank(dev, 0);
  76
  77         regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
  78
  79         return IRQ_HANDLED;
  80 }
  81
  82 static int fsl_dcu_irq_install(struct drm_device *dev, unsigned int irq)
  83 {
  84         if (irq == IRQ_NOTCONNECTED)
  85                 return -ENOTCONN;
  86
  87         fsl_dcu_irq_reset(dev);
  88
  89         return request_irq(irq, fsl_dcu_drm_irq, 0, dev->driver->name, dev);
  90 }
  91
  92 static void fsl_dcu_irq_uninstall(struct drm_device *dev)
  93 {
  94         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
  95
  96         fsl_dcu_irq_reset(dev);
  97         free_irq(fsl_dev->irq, dev);
  98 }
  99
 100 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags)
 101 {
 102         struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
 103         int ret;
 104
 105         ret = fsl_dcu_drm_modeset_init(fsl_dev);
 106         if (ret < 0) {
 107                 dev_err(dev->dev, "failed to initialize mode setting\n");
 108                 return ret;
 109         }
 110
 111         ret = drm_vblank_init(dev, dev->mode_config.num_crtc);
 112         if (ret < 0) {
 113                 dev_err(dev->dev, "failed to initialize vblank\n");
 114                 goto done_vblank;
 115         }
 116
 117         ret = fsl_dcu_irq_install(dev, fsl_dev->irq);
 118         if (ret < 0) {
 119                 dev_err(dev->dev, "failed to install IRQ handler\n");
 120                 goto done_irq;
 121         }
 122
 123         if (legacyfb_depth != 16 && legacyfb_depth != 24 &&
 124             legacyfb_depth != 32) {
 125                 dev_warn(dev->dev,
 126                         "Invalid legacyfb_depth.  Defaulting to 24bpp\n");
 127                 legacyfb_depth = 24;
 128         }
 129
 130         return 0;
 131 done_irq:
 132         drm_kms_helper_poll_fini(dev);
 133
 134         drm_mode_config_cleanup(dev);
 135 done_vblank:
 136         dev->dev_private = NULL;
 137
 138         return ret;
 139 }
 140
 141 static void fsl_dcu_unload(struct drm_device *dev)
 142 {
 143         drm_atomic_helper_shutdown(dev);
 144         drm_kms_helper_poll_fini(dev);
 145
 146         drm_mode_config_cleanup(dev);
 147         fsl_dcu_irq_uninstall(dev);
 148
 149         dev->dev_private = NULL;
 150 }
 151
 152 DEFINE_DRM_GEM_DMA_FOPS(fsl_dcu_drm_fops);
 153
 154 static const struct drm_driver fsl_dcu_drm_driver = {
 155         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 156         .load                   = fsl_dcu_load,
 157         .unload                 = fsl_dcu_unload,
 158         DRM_GEM_DMA_DRIVER_OPS,
 159         .fops                   = &fsl_dcu_drm_fops,
 160         .name                   = "fsl-dcu-drm",
 161         .desc                   = "Freescale DCU DRM",
 162         .date                   = "20160425",
 163         .major                  = 1,
 164         .minor                  = 1,
 165 };
 166
 167 #ifdef CONFIG_PM_SLEEP
 168 static int fsl_dcu_drm_pm_suspend(struct device *dev)
 169 {
 170         struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev);
 171         int ret;
 172
 173         if (!fsl_dev)
 174                 return 0;
 175
 176         disable_irq(fsl_dev->irq);
 177
 178         ret = drm_mode_config_helper_suspend(fsl_dev->drm);
 179         if (ret) {
 180                 enable_irq(fsl_dev->irq);
 181                 return ret;
 182         }
 183
 184         clk_disable_unprepare(fsl_dev->clk);
 185
 186         return 0;
 187 }
 188
 189 static int fsl_dcu_drm_pm_resume(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         ret = clk_prepare_enable(fsl_dev->clk);
 198         if (ret < 0) {
 199                 dev_err(dev, "failed to enable dcu clk\n");
 200                 return ret;
 201         }
 202
 203         if (fsl_dev->tcon)
 204                 fsl_tcon_bypass_enable(fsl_dev->tcon);
 205         fsl_dcu_drm_init_planes(fsl_dev->drm);
 206         enable_irq(fsl_dev->irq);
 207
 208         drm_mode_config_helper_resume(fsl_dev->drm);
 209
 210         return 0;
 211 }
 212 #endif
 213
 214 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = {
 215         SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume)
 216 };
 217
 218 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = {
 219         .name = "ls1021a",
 220         .total_layer = 16,
 221         .max_layer = 4,
 222         .layer_regs = LS1021A_LAYER_REG_NUM,
 223 };
 224
 225 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = {
 226         .name = "vf610",
 227         .total_layer = 64,
 228         .max_layer = 6,
 229         .layer_regs = VF610_LAYER_REG_NUM,
 230 };
 231
 232 static const struct of_device_id fsl_dcu_of_match[] = {
 233         {
 234                 .compatible = "fsl,ls1021a-dcu",
 235                 .data = &fsl_dcu_ls1021a_data,
 236         }, {
 237                 .compatible = "fsl,vf610-dcu",
 238                 .data = &fsl_dcu_vf610_data,
 239         }, {
 240         },
 241 };
 242 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match);
 243
 244 static int fsl_dcu_drm_probe(struct platform_device *pdev)
 245 {
 246         struct fsl_dcu_drm_device *fsl_dev;
 247         struct drm_device *drm;
 248         struct device *dev = &pdev->dev;
 249         struct resource *res;
 250         void __iomem *base;
 251         struct clk *pix_clk_in;
 252         char pix_clk_name[32];
 253         const char *pix_clk_in_name;
 254         const struct of_device_id *id;
 255         int ret;
 256         u8 div_ratio_shift = 0;
 257
 258         fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL);
 259         if (!fsl_dev)
 260                 return -ENOMEM;
 261
 262         id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node);
 263         if (!id)
 264                 return -ENODEV;
 265         fsl_dev->soc = id->data;
 266
 267         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 268         base = devm_ioremap_resource(dev, res);
 269         if (IS_ERR(base)) {
 270                 ret = PTR_ERR(base);
 271                 return ret;
 272         }
 273
 274         fsl_dev->irq = platform_get_irq(pdev, 0);
 275         if (fsl_dev->irq < 0) {
 276                 dev_err(dev, "failed to get irq\n");
 277                 return fsl_dev->irq;
 278         }
 279
 280         fsl_dev->regmap = devm_regmap_init_mmio(dev, base,
 281                         &fsl_dcu_regmap_config);
 282         if (IS_ERR(fsl_dev->regmap)) {
 283                 dev_err(dev, "regmap init failed\n");
 284                 return PTR_ERR(fsl_dev->regmap);
 285         }
 286
 287         fsl_dev->clk = devm_clk_get(dev, "dcu");
 288         if (IS_ERR(fsl_dev->clk)) {
 289                 dev_err(dev, "failed to get dcu clock\n");
 290                 return PTR_ERR(fsl_dev->clk);
 291         }
 292         ret = clk_prepare_enable(fsl_dev->clk);
 293         if (ret < 0) {
 294                 dev_err(dev, "failed to enable dcu clk\n");
 295                 return ret;
 296         }
 297
 298         pix_clk_in = devm_clk_get(dev, "pix");
 299         if (IS_ERR(pix_clk_in)) {
 300                 /* legancy binding, use dcu clock as pixel clock input */
 301                 pix_clk_in = fsl_dev->clk;
 302         }
 303
 304         if (of_property_read_bool(dev->of_node, "big-endian"))
 305                 div_ratio_shift = 24;
 306
 307         pix_clk_in_name = __clk_get_name(pix_clk_in);
 308         snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name);
 309         fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name,
 310                         pix_clk_in_name, 0, base + DCU_DIV_RATIO,
 311                         div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL);
 312         if (IS_ERR(fsl_dev->pix_clk)) {
 313                 dev_err(dev, "failed to register pix clk\n");
 314                 ret = PTR_ERR(fsl_dev->pix_clk);
 315                 goto disable_clk;
 316         }
 317
 318         fsl_dev->tcon = fsl_tcon_init(dev);
 319
 320         drm = drm_dev_alloc(&fsl_dcu_drm_driver, dev);
 321         if (IS_ERR(drm)) {
 322                 ret = PTR_ERR(drm);
 323                 goto unregister_pix_clk;
 324         }
 325
 326         fsl_dev->dev = dev;
 327         fsl_dev->drm = drm;
 328         fsl_dev->np = dev->of_node;
 329         drm->dev_private = fsl_dev;
 330         dev_set_drvdata(dev, fsl_dev);
 331
 332         ret = drm_dev_register(drm, 0);
 333         if (ret < 0)
 334                 goto put;
 335
 336         drm_fbdev_dma_setup(drm, legacyfb_depth);
 337
 338         return 0;
 339
 340 put:
 341         drm_dev_put(drm);
 342 unregister_pix_clk:
 343         clk_unregister(fsl_dev->pix_clk);
 344 disable_clk:
 345         clk_disable_unprepare(fsl_dev->clk);
 346         return ret;
 347 }
 348
 349 static void fsl_dcu_drm_remove(struct platform_device *pdev)
 350 {
 351         struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev);
 352
 353         drm_dev_unregister(fsl_dev->drm);
 354         drm_dev_put(fsl_dev->drm);
 355         clk_disable_unprepare(fsl_dev->clk);
 356         clk_unregister(fsl_dev->pix_clk);
 357 }
 358
 359 static struct platform_driver fsl_dcu_drm_platform_driver = {
 360         .probe          = fsl_dcu_drm_probe,
 361         .remove_new     = fsl_dcu_drm_remove,
 362         .driver         = {
 363                 .name   = "fsl-dcu",
 364                 .pm     = &fsl_dcu_drm_pm_ops,
 365                 .of_match_table = fsl_dcu_of_match,
 366         },
 367 };
 368
 369 drm_module_platform_driver(fsl_dcu_drm_platform_driver);
 370
 371 MODULE_DESCRIPTION("Freescale DCU DRM Driver");
 372 MODULE_LICENSE("GPL");