drivers/gpu/drm/mxsfb/lcdif_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2022 Marek Vasut <[email protected]>
   4  *
   5  * This code is based on drivers/gpu/drm/mxsfb/mxsfb*
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/io.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_device.h>
  14 #include <linux/of_graph.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_bridge.h>
  20 #include <drm/drm_drv.h>
  21 #include <drm/drm_encoder.h>
  22 #include <drm/drm_fbdev_dma.h>
  23 #include <drm/drm_gem_dma_helper.h>
  24 #include <drm/drm_gem_framebuffer_helper.h>
  25 #include <drm/drm_mode_config.h>
  26 #include <drm/drm_module.h>
  27 #include <drm/drm_of.h>
  28 #include <drm/drm_probe_helper.h>
  29 #include <drm/drm_vblank.h>
  30
  31 #include "lcdif_drv.h"
  32 #include "lcdif_regs.h"
  33
  34 static const struct drm_mode_config_funcs lcdif_mode_config_funcs = {
  35         .fb_create              = drm_gem_fb_create,
  36         .atomic_check           = drm_atomic_helper_check,
  37         .atomic_commit          = drm_atomic_helper_commit,
  38 };
  39
  40 static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = {
  41         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
  42 };
  43
  44 static const struct drm_encoder_funcs lcdif_encoder_funcs = {
  45         .destroy = drm_encoder_cleanup,
  46 };
  47
  48 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif)
  49 {
  50         struct device *dev = lcdif->drm->dev;
  51         struct device_node *ep;
  52         struct drm_bridge *bridge;
  53         int ret;
  54
  55         for_each_endpoint_of_node(dev->of_node, ep) {
  56                 struct device_node *remote;
  57                 struct of_endpoint of_ep;
  58                 struct drm_encoder *encoder;
  59
  60                 remote = of_graph_get_remote_port_parent(ep);
  61                 if (!of_device_is_available(remote)) {
  62                         of_node_put(remote);
  63                         continue;
  64                 }
  65                 of_node_put(remote);
  66
  67                 ret = of_graph_parse_endpoint(ep, &of_ep);
  68                 if (ret < 0) {
  69                         dev_err(dev, "Failed to parse endpoint %pOF\n", ep);
  70                         of_node_put(ep);
  71                         return ret;
  72                 }
  73
  74                 bridge = devm_drm_of_get_bridge(dev, dev->of_node, 0, of_ep.id);
  75                 if (IS_ERR(bridge)) {
  76                         of_node_put(ep);
  77                         return dev_err_probe(dev, PTR_ERR(bridge),
  78                                              "Failed to get bridge for endpoint%u\n",
  79                                              of_ep.id);
  80                 }
  81
  82                 encoder = devm_kzalloc(dev, sizeof(*encoder), GFP_KERNEL);
  83                 if (!encoder) {
  84                         dev_err(dev, "Failed to allocate encoder for endpoint%u\n",
  85                                 of_ep.id);
  86                         of_node_put(ep);
  87                         return -ENOMEM;
  88                 }
  89
  90                 encoder->possible_crtcs = drm_crtc_mask(&lcdif->crtc);
  91                 ret = drm_encoder_init(lcdif->drm, encoder, &lcdif_encoder_funcs,
  92                                        DRM_MODE_ENCODER_NONE, NULL);
  93                 if (ret) {
  94                         dev_err(dev, "Failed to initialize encoder for endpoint%u: %d\n",
  95                                 of_ep.id, ret);
  96                         of_node_put(ep);
  97                         return ret;
  98                 }
  99
 100                 ret = drm_bridge_attach(encoder, bridge, NULL, 0);
 101                 if (ret) {
 102                         of_node_put(ep);
 103                         return dev_err_probe(dev, ret,
 104                                              "Failed to attach bridge for endpoint%u\n",
 105                                              of_ep.id);
 106                 }
 107         }
 108
 109         return 0;
 110 }
 111
 112 static irqreturn_t lcdif_irq_handler(int irq, void *data)
 113 {
 114         struct drm_device *drm = data;
 115         struct lcdif_drm_private *lcdif = drm->dev_private;
 116         u32 reg, stat;
 117
 118         stat = readl(lcdif->base + LCDC_V8_INT_STATUS_D0);
 119         if (!stat)
 120                 return IRQ_NONE;
 121
 122         if (stat & INT_STATUS_D0_VS_BLANK) {
 123                 reg = readl(lcdif->base + LCDC_V8_CTRLDESCL0_5);
 124                 if (!(reg & CTRLDESCL0_5_SHADOW_LOAD_EN))
 125                         drm_crtc_handle_vblank(&lcdif->crtc);
 126         }
 127
 128         writel(stat, lcdif->base + LCDC_V8_INT_STATUS_D0);
 129
 130         return IRQ_HANDLED;
 131 }
 132
 133 static int lcdif_load(struct drm_device *drm)
 134 {
 135         struct platform_device *pdev = to_platform_device(drm->dev);
 136         struct lcdif_drm_private *lcdif;
 137         struct resource *res;
 138         int ret;
 139
 140         lcdif = devm_kzalloc(&pdev->dev, sizeof(*lcdif), GFP_KERNEL);
 141         if (!lcdif)
 142                 return -ENOMEM;
 143
 144         lcdif->drm = drm;
 145         drm->dev_private = lcdif;
 146
 147         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 148         lcdif->base = devm_ioremap_resource(drm->dev, res);
 149         if (IS_ERR(lcdif->base))
 150                 return PTR_ERR(lcdif->base);
 151
 152         lcdif->clk = devm_clk_get(drm->dev, "pix");
 153         if (IS_ERR(lcdif->clk))
 154                 return PTR_ERR(lcdif->clk);
 155
 156         lcdif->clk_axi = devm_clk_get(drm->dev, "axi");
 157         if (IS_ERR(lcdif->clk_axi))
 158                 return PTR_ERR(lcdif->clk_axi);
 159
 160         lcdif->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
 161         if (IS_ERR(lcdif->clk_disp_axi))
 162                 return PTR_ERR(lcdif->clk_disp_axi);
 163
 164         platform_set_drvdata(pdev, drm);
 165
 166         ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(36));
 167         if (ret)
 168                 return ret;
 169
 170         /* Modeset init */
 171         drm_mode_config_init(drm);
 172
 173         ret = lcdif_kms_init(lcdif);
 174         if (ret < 0) {
 175                 dev_err(drm->dev, "Failed to initialize KMS pipeline\n");
 176                 return ret;
 177         }
 178
 179         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 180         if (ret < 0) {
 181                 dev_err(drm->dev, "Failed to initialise vblank\n");
 182                 return ret;
 183         }
 184
 185         /* Start with vertical blanking interrupt reporting disabled. */
 186         drm_crtc_vblank_off(&lcdif->crtc);
 187
 188         ret = lcdif_attach_bridge(lcdif);
 189         if (ret)
 190                 return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n");
 191
 192         drm->mode_config.min_width      = LCDIF_MIN_XRES;
 193         drm->mode_config.min_height     = LCDIF_MIN_YRES;
 194         drm->mode_config.max_width      = LCDIF_MAX_XRES;
 195         drm->mode_config.max_height     = LCDIF_MAX_YRES;
 196         drm->mode_config.funcs          = &lcdif_mode_config_funcs;
 197         drm->mode_config.helper_private = &lcdif_mode_config_helpers;
 198
 199         drm_mode_config_reset(drm);
 200
 201         ret = platform_get_irq(pdev, 0);
 202         if (ret < 0)
 203                 return ret;
 204         lcdif->irq = ret;
 205
 206         ret = devm_request_irq(drm->dev, lcdif->irq, lcdif_irq_handler, 0,
 207                                drm->driver->name, drm);
 208         if (ret < 0) {
 209                 dev_err(drm->dev, "Failed to install IRQ handler\n");
 210                 return ret;
 211         }
 212
 213         drm_kms_helper_poll_init(drm);
 214
 215         drm_helper_hpd_irq_event(drm);
 216
 217         pm_runtime_enable(drm->dev);
 218
 219         return 0;
 220 }
 221
 222 static void lcdif_unload(struct drm_device *drm)
 223 {
 224         struct lcdif_drm_private *lcdif = drm->dev_private;
 225
 226         pm_runtime_get_sync(drm->dev);
 227
 228         drm_crtc_vblank_off(&lcdif->crtc);
 229
 230         drm_kms_helper_poll_fini(drm);
 231         drm_mode_config_cleanup(drm);
 232
 233         pm_runtime_put_sync(drm->dev);
 234         pm_runtime_disable(drm->dev);
 235
 236         drm->dev_private = NULL;
 237 }
 238
 239 DEFINE_DRM_GEM_DMA_FOPS(fops);
 240
 241 static const struct drm_driver lcdif_driver = {
 242         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
 243         DRM_GEM_DMA_DRIVER_OPS,
 244         .fops   = &fops,
 245         .name   = "imx-lcdif",
 246         .desc   = "i.MX LCDIF Controller DRM",
 247         .date   = "20220417",
 248         .major  = 1,
 249         .minor  = 0,
 250 };
 251
 252 static const struct of_device_id lcdif_dt_ids[] = {
 253         { .compatible = "fsl,imx8mp-lcdif" },
 254         { .compatible = "fsl,imx93-lcdif" },
 255         { /* sentinel */ }
 256 };
 257 MODULE_DEVICE_TABLE(of, lcdif_dt_ids);
 258
 259 static int lcdif_probe(struct platform_device *pdev)
 260 {
 261         struct drm_device *drm;
 262         int ret;
 263
 264         drm = drm_dev_alloc(&lcdif_driver, &pdev->dev);
 265         if (IS_ERR(drm))
 266                 return PTR_ERR(drm);
 267
 268         ret = lcdif_load(drm);
 269         if (ret)
 270                 goto err_free;
 271
 272         ret = drm_dev_register(drm, 0);
 273         if (ret)
 274                 goto err_unload;
 275
 276         drm_fbdev_dma_setup(drm, 32);
 277
 278         return 0;
 279
 280 err_unload:
 281         lcdif_unload(drm);
 282 err_free:
 283         drm_dev_put(drm);
 284
 285         return ret;
 286 }
 287
 288 static int lcdif_remove(struct platform_device *pdev)
 289 {
 290         struct drm_device *drm = platform_get_drvdata(pdev);
 291
 292         drm_dev_unregister(drm);
 293         drm_atomic_helper_shutdown(drm);
 294         lcdif_unload(drm);
 295         drm_dev_put(drm);
 296
 297         return 0;
 298 }
 299
 300 static void lcdif_shutdown(struct platform_device *pdev)
 301 {
 302         struct drm_device *drm = platform_get_drvdata(pdev);
 303
 304         drm_atomic_helper_shutdown(drm);
 305 }
 306
 307 static int __maybe_unused lcdif_rpm_suspend(struct device *dev)
 308 {
 309         struct drm_device *drm = dev_get_drvdata(dev);
 310         struct lcdif_drm_private *lcdif = drm->dev_private;
 311
 312         /* These clock supply the DISPLAY CLOCK Domain */
 313         clk_disable_unprepare(lcdif->clk);
 314         /* These clock supply the System Bus, AXI, Write Path, LFIFO */
 315         clk_disable_unprepare(lcdif->clk_disp_axi);
 316         /* These clock supply the Control Bus, APB, APBH Ctrl Registers */
 317         clk_disable_unprepare(lcdif->clk_axi);
 318
 319         return 0;
 320 }
 321
 322 static int __maybe_unused lcdif_rpm_resume(struct device *dev)
 323 {
 324         struct drm_device *drm = dev_get_drvdata(dev);
 325         struct lcdif_drm_private *lcdif = drm->dev_private;
 326
 327         /* These clock supply the Control Bus, APB, APBH Ctrl Registers */
 328         clk_prepare_enable(lcdif->clk_axi);
 329         /* These clock supply the System Bus, AXI, Write Path, LFIFO */
 330         clk_prepare_enable(lcdif->clk_disp_axi);
 331         /* These clock supply the DISPLAY CLOCK Domain */
 332         clk_prepare_enable(lcdif->clk);
 333
 334         return 0;
 335 }
 336
 337 static int __maybe_unused lcdif_suspend(struct device *dev)
 338 {
 339         struct drm_device *drm = dev_get_drvdata(dev);
 340         int ret;
 341
 342         ret = drm_mode_config_helper_suspend(drm);
 343         if (ret)
 344                 return ret;
 345
 346         return lcdif_rpm_suspend(dev);
 347 }
 348
 349 static int __maybe_unused lcdif_resume(struct device *dev)
 350 {
 351         struct drm_device *drm = dev_get_drvdata(dev);
 352
 353         lcdif_rpm_resume(dev);
 354
 355         return drm_mode_config_helper_resume(drm);
 356 }
 357
 358 static const struct dev_pm_ops lcdif_pm_ops = {
 359         SET_SYSTEM_SLEEP_PM_OPS(lcdif_suspend, lcdif_resume)
 360         SET_RUNTIME_PM_OPS(lcdif_rpm_suspend, lcdif_rpm_resume, NULL)
 361 };
 362
 363 static struct platform_driver lcdif_platform_driver = {
 364         .probe          = lcdif_probe,
 365         .remove         = lcdif_remove,
 366         .shutdown       = lcdif_shutdown,
 367         .driver = {
 368                 .name           = "imx-lcdif",
 369                 .of_match_table = lcdif_dt_ids,
 370                 .pm             = &lcdif_pm_ops,
 371         },
 372 };
 373
 374 drm_module_platform_driver(lcdif_platform_driver);
 375
 376 MODULE_AUTHOR("Marek Vasut <[email protected]>");
 377 MODULE_DESCRIPTION("Freescale LCDIF DRM/KMS driver");
 378 MODULE_LICENSE("GPL");