drivers/gpu/drm/mxsfb/mxsfb_drv.c

   1 /*
   2  * Copyright (C) 2016 Marek Vasut <marex@denx.de>
   3  *
   4  * This code is based on drivers/video/fbdev/mxsfb.c :
   5  * Copyright (C) 2010 Juergen Beisert, Pengutronix
   6  * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
   7  * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2
  12  * of the License, or (at your option) any later version.
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/spinlock.h>
  21 #include <linux/clk.h>
  22 #include <linux/component.h>
  23 #include <linux/list.h>
  24 #include <linux/of_device.h>
  25 #include <linux/of_graph.h>
  26 #include <linux/of_reserved_mem.h>
  27 #include <linux/pm_runtime.h>
  28 #include <linux/reservation.h>
  29
  30 #include <drm/drmP.h>
  31 #include <drm/drm_atomic.h>
  32 #include <drm/drm_atomic_helper.h>
  33 #include <drm/drm_crtc.h>
  34 #include <drm/drm_fb_helper.h>
  35 #include <drm/drm_fb_cma_helper.h>
  36 #include <drm/drm_gem_cma_helper.h>
  37 #include <drm/drm_gem_framebuffer_helper.h>
  38 #include <drm/drm_of.h>
  39 #include <drm/drm_panel.h>
  40 #include <drm/drm_probe_helper.h>
  41 #include <drm/drm_simple_kms_helper.h>
  42
  43 #include "mxsfb_drv.h"
  44 #include "mxsfb_regs.h"
  45
  46 enum mxsfb_devtype {
  47         MXSFB_V3,
  48         MXSFB_V4,
  49 };
  50
  51 static const struct mxsfb_devdata mxsfb_devdata[] = {
  52         [MXSFB_V3] = {
  53                 .transfer_count = LCDC_V3_TRANSFER_COUNT,
  54                 .cur_buf        = LCDC_V3_CUR_BUF,
  55                 .next_buf       = LCDC_V3_NEXT_BUF,
  56                 .debug0         = LCDC_V3_DEBUG0,
  57                 .hs_wdth_mask   = 0xff,
  58                 .hs_wdth_shift  = 24,
  59                 .ipversion      = 3,
  60         },
  61         [MXSFB_V4] = {
  62                 .transfer_count = LCDC_V4_TRANSFER_COUNT,
  63                 .cur_buf        = LCDC_V4_CUR_BUF,
  64                 .next_buf       = LCDC_V4_NEXT_BUF,
  65                 .debug0         = LCDC_V4_DEBUG0,
  66                 .hs_wdth_mask   = 0x3fff,
  67                 .hs_wdth_shift  = 18,
  68                 .ipversion      = 4,
  69         },
  70 };
  71
  72 static const uint32_t mxsfb_formats[] = {
  73         DRM_FORMAT_XRGB8888,
  74         DRM_FORMAT_RGB565
  75 };
  76
  77 static struct mxsfb_drm_private *
  78 drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
  79 {
  80         return container_of(pipe, struct mxsfb_drm_private, pipe);
  81 }
  82
  83 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
  84 {
  85         if (mxsfb->clk_axi)
  86                 clk_prepare_enable(mxsfb->clk_axi);
  87 }
  88
  89 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
  90 {
  91         if (mxsfb->clk_axi)
  92                 clk_disable_unprepare(mxsfb->clk_axi);
  93 }
  94
  95 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
  96         .fb_create              = drm_gem_fb_create,
  97         .atomic_check           = drm_atomic_helper_check,
  98         .atomic_commit          = drm_atomic_helper_commit,
  99 };
 100
 101 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = {
 102         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 103 };
 104
 105 static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
 106                               struct drm_crtc_state *crtc_state,
 107                               struct drm_plane_state *plane_state)
 108 {
 109         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 110         struct drm_device *drm = pipe->plane.dev;
 111
 112         pm_runtime_get_sync(drm->dev);
 113         drm_panel_prepare(mxsfb->panel);
 114         mxsfb_crtc_enable(mxsfb);
 115         drm_panel_enable(mxsfb->panel);
 116 }
 117
 118 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
 119 {
 120         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 121         struct drm_device *drm = pipe->plane.dev;
 122         struct drm_crtc *crtc = &pipe->crtc;
 123         struct drm_pending_vblank_event *event;
 124
 125         drm_panel_disable(mxsfb->panel);
 126         mxsfb_crtc_disable(mxsfb);
 127         drm_panel_unprepare(mxsfb->panel);
 128         pm_runtime_put_sync(drm->dev);
 129
 130         spin_lock_irq(&drm->event_lock);
 131         event = crtc->state->event;
 132         if (event) {
 133                 crtc->state->event = NULL;
 134                 drm_crtc_send_vblank_event(crtc, event);
 135         }
 136         spin_unlock_irq(&drm->event_lock);
 137 }
 138
 139 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
 140                               struct drm_plane_state *plane_state)
 141 {
 142         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 143
 144         mxsfb_plane_atomic_update(mxsfb, plane_state);
 145 }
 146
 147 static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
 148 {
 149         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 150
 151         /* Clear and enable VBLANK IRQ */
 152         mxsfb_enable_axi_clk(mxsfb);
 153         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 154         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
 155         mxsfb_disable_axi_clk(mxsfb);
 156
 157         return 0;
 158 }
 159
 160 static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
 161 {
 162         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 163
 164         /* Disable and clear VBLANK IRQ */
 165         mxsfb_enable_axi_clk(mxsfb);
 166         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 167         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 168         mxsfb_disable_axi_clk(mxsfb);
 169 }
 170
 171 static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
 172         .enable         = mxsfb_pipe_enable,
 173         .disable        = mxsfb_pipe_disable,
 174         .update         = mxsfb_pipe_update,
 175         .prepare_fb     = drm_gem_fb_simple_display_pipe_prepare_fb,
 176         .enable_vblank  = mxsfb_pipe_enable_vblank,
 177         .disable_vblank = mxsfb_pipe_disable_vblank,
 178 };
 179
 180 static int mxsfb_load(struct drm_device *drm, unsigned long flags)
 181 {
 182         struct platform_device *pdev = to_platform_device(drm->dev);
 183         struct mxsfb_drm_private *mxsfb;
 184         struct resource *res;
 185         int ret;
 186
 187         mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
 188         if (!mxsfb)
 189                 return -ENOMEM;
 190
 191         drm->dev_private = mxsfb;
 192         mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
 193
 194         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 195         mxsfb->base = devm_ioremap_resource(drm->dev, res);
 196         if (IS_ERR(mxsfb->base))
 197                 return PTR_ERR(mxsfb->base);
 198
 199         mxsfb->clk = devm_clk_get(drm->dev, NULL);
 200         if (IS_ERR(mxsfb->clk))
 201                 return PTR_ERR(mxsfb->clk);
 202
 203         mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
 204         if (IS_ERR(mxsfb->clk_axi))
 205                 mxsfb->clk_axi = NULL;
 206
 207         mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
 208         if (IS_ERR(mxsfb->clk_disp_axi))
 209                 mxsfb->clk_disp_axi = NULL;
 210
 211         ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
 212         if (ret)
 213                 return ret;
 214
 215         pm_runtime_enable(drm->dev);
 216
 217         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 218         if (ret < 0) {
 219                 dev_err(drm->dev, "Failed to initialise vblank\n");
 220                 goto err_vblank;
 221         }
 222
 223         /* Modeset init */
 224         drm_mode_config_init(drm);
 225
 226         ret = mxsfb_create_output(drm);
 227         if (ret < 0) {
 228                 dev_err(drm->dev, "Failed to create outputs\n");
 229                 goto err_vblank;
 230         }
 231
 232         ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
 233                         mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL,
 234                         &mxsfb->connector);
 235         if (ret < 0) {
 236                 dev_err(drm->dev, "Cannot setup simple display pipe\n");
 237                 goto err_vblank;
 238         }
 239
 240         ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
 241         if (ret) {
 242                 dev_err(drm->dev, "Cannot connect panel\n");
 243                 goto err_vblank;
 244         }
 245
 246         drm->mode_config.min_width      = MXSFB_MIN_XRES;
 247         drm->mode_config.min_height     = MXSFB_MIN_YRES;
 248         drm->mode_config.max_width      = MXSFB_MAX_XRES;
 249         drm->mode_config.max_height     = MXSFB_MAX_YRES;
 250         drm->mode_config.funcs          = &mxsfb_mode_config_funcs;
 251         drm->mode_config.helper_private = &mxsfb_mode_config_helpers;
 252
 253         drm_mode_config_reset(drm);
 254
 255         pm_runtime_get_sync(drm->dev);
 256         ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
 257         pm_runtime_put_sync(drm->dev);
 258
 259         if (ret < 0) {
 260                 dev_err(drm->dev, "Failed to install IRQ handler\n");
 261                 goto err_irq;
 262         }
 263
 264         drm_kms_helper_poll_init(drm);
 265
 266         platform_set_drvdata(pdev, drm);
 267
 268         drm_helper_hpd_irq_event(drm);
 269
 270         return 0;
 271
 272 err_irq:
 273         drm_panel_detach(mxsfb->panel);
 274 err_vblank:
 275         pm_runtime_disable(drm->dev);
 276
 277         return ret;
 278 }
 279
 280 static void mxsfb_unload(struct drm_device *drm)
 281 {
 282         drm_kms_helper_poll_fini(drm);
 283         drm_mode_config_cleanup(drm);
 284
 285         pm_runtime_get_sync(drm->dev);
 286         drm_irq_uninstall(drm);
 287         pm_runtime_put_sync(drm->dev);
 288
 289         drm->dev_private = NULL;
 290
 291         pm_runtime_disable(drm->dev);
 292 }
 293
 294 static void mxsfb_irq_preinstall(struct drm_device *drm)
 295 {
 296         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 297
 298         mxsfb_pipe_disable_vblank(&mxsfb->pipe);
 299 }
 300
 301 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
 302 {
 303         struct drm_device *drm = data;
 304         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 305         u32 reg;
 306
 307         mxsfb_enable_axi_clk(mxsfb);
 308
 309         reg = readl(mxsfb->base + LCDC_CTRL1);
 310
 311         if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
 312                 drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
 313
 314         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 315
 316         mxsfb_disable_axi_clk(mxsfb);
 317
 318         return IRQ_HANDLED;
 319 }
 320
 321 DEFINE_DRM_GEM_CMA_FOPS(fops);
 322
 323 static struct drm_driver mxsfb_driver = {
 324         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 325                                   DRIVER_PRIME | DRIVER_ATOMIC,
 326         .irq_handler            = mxsfb_irq_handler,
 327         .irq_preinstall         = mxsfb_irq_preinstall,
 328         .irq_uninstall          = mxsfb_irq_preinstall,
 329         .gem_free_object_unlocked = drm_gem_cma_free_object,
 330         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 331         .dumb_create            = drm_gem_cma_dumb_create,
 332         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 333         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 334         .gem_prime_export       = drm_gem_prime_export,
 335         .gem_prime_import       = drm_gem_prime_import,
 336         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 337         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 338         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 339         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 340         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 341         .fops   = &fops,
 342         .name   = "mxsfb-drm",
 343         .desc   = "MXSFB Controller DRM",
 344         .date   = "20160824",
 345         .major  = 1,
 346         .minor  = 0,
 347 };
 348
 349 static const struct platform_device_id mxsfb_devtype[] = {
 350         { .name = "imx23-fb", .driver_data = MXSFB_V3, },
 351         { .name = "imx28-fb", .driver_data = MXSFB_V4, },
 352         { .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
 353         { /* sentinel */ }
 354 };
 355 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
 356
 357 static const struct of_device_id mxsfb_dt_ids[] = {
 358         { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
 359         { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
 360         { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
 361         { /* sentinel */ }
 362 };
 363 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
 364
 365 static int mxsfb_probe(struct platform_device *pdev)
 366 {
 367         struct drm_device *drm;
 368         const struct of_device_id *of_id =
 369                         of_match_device(mxsfb_dt_ids, &pdev->dev);
 370         int ret;
 371
 372         if (!pdev->dev.of_node)
 373                 return -ENODEV;
 374
 375         if (of_id)
 376                 pdev->id_entry = of_id->data;
 377
 378         drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
 379         if (IS_ERR(drm))
 380                 return PTR_ERR(drm);
 381
 382         ret = mxsfb_load(drm, 0);
 383         if (ret)
 384                 goto err_free;
 385
 386         ret = drm_dev_register(drm, 0);
 387         if (ret)
 388                 goto err_unload;
 389
 390         drm_fbdev_generic_setup(drm, 32);
 391
 392         return 0;
 393
 394 err_unload:
 395         mxsfb_unload(drm);
 396 err_free:
 397         drm_dev_put(drm);
 398
 399         return ret;
 400 }
 401
 402 static int mxsfb_remove(struct platform_device *pdev)
 403 {
 404         struct drm_device *drm = platform_get_drvdata(pdev);
 405
 406         drm_dev_unregister(drm);
 407         mxsfb_unload(drm);
 408         drm_dev_put(drm);
 409
 410         return 0;
 411 }
 412
 413 #ifdef CONFIG_PM_SLEEP
 414 static int mxsfb_suspend(struct device *dev)
 415 {
 416         struct drm_device *drm = dev_get_drvdata(dev);
 417
 418         return drm_mode_config_helper_suspend(drm);
 419 }
 420
 421 static int mxsfb_resume(struct device *dev)
 422 {
 423         struct drm_device *drm = dev_get_drvdata(dev);
 424
 425         return drm_mode_config_helper_resume(drm);
 426 }
 427 #endif
 428
 429 static const struct dev_pm_ops mxsfb_pm_ops = {
 430         SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
 431 };
 432
 433 static struct platform_driver mxsfb_platform_driver = {
 434         .probe          = mxsfb_probe,
 435         .remove         = mxsfb_remove,
 436         .id_table       = mxsfb_devtype,
 437         .driver = {
 438                 .name           = "mxsfb",
 439                 .of_match_table = mxsfb_dt_ids,
 440                 .pm             = &mxsfb_pm_ops,
 441         },
 442 };
 443
 444 module_platform_driver(mxsfb_platform_driver);
 445
 446 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 447 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
 448 MODULE_LICENSE("GPL");