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_crtc_helper.h>
  35 #include <drm/drm_fb_helper.h>
  36 #include <drm/drm_fb_cma_helper.h>
  37 #include <drm/drm_gem_cma_helper.h>
  38 #include <drm/drm_gem_framebuffer_helper.h>
  39 #include <drm/drm_of.h>
  40 #include <drm/drm_panel.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 void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
 102                               struct drm_crtc_state *crtc_state,
 103                               struct drm_plane_state *plane_state)
 104 {
 105         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 106
 107         drm_panel_prepare(mxsfb->panel);
 108         mxsfb_crtc_enable(mxsfb);
 109         drm_panel_enable(mxsfb->panel);
 110 }
 111
 112 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
 113 {
 114         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 115
 116         drm_panel_disable(mxsfb->panel);
 117         mxsfb_crtc_disable(mxsfb);
 118         drm_panel_unprepare(mxsfb->panel);
 119 }
 120
 121 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
 122                               struct drm_plane_state *plane_state)
 123 {
 124         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 125
 126         mxsfb_plane_atomic_update(mxsfb, plane_state);
 127 }
 128
 129 static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
 130 {
 131         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 132
 133         /* Clear and enable VBLANK IRQ */
 134         mxsfb_enable_axi_clk(mxsfb);
 135         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 136         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
 137         mxsfb_disable_axi_clk(mxsfb);
 138
 139         return 0;
 140 }
 141
 142 static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
 143 {
 144         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 145
 146         /* Disable and clear VBLANK IRQ */
 147         mxsfb_enable_axi_clk(mxsfb);
 148         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 149         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 150         mxsfb_disable_axi_clk(mxsfb);
 151 }
 152
 153 static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
 154         .enable         = mxsfb_pipe_enable,
 155         .disable        = mxsfb_pipe_disable,
 156         .update         = mxsfb_pipe_update,
 157         .prepare_fb     = drm_gem_fb_simple_display_pipe_prepare_fb,
 158         .enable_vblank  = mxsfb_pipe_enable_vblank,
 159         .disable_vblank = mxsfb_pipe_disable_vblank,
 160 };
 161
 162 static int mxsfb_load(struct drm_device *drm, unsigned long flags)
 163 {
 164         struct platform_device *pdev = to_platform_device(drm->dev);
 165         struct mxsfb_drm_private *mxsfb;
 166         struct resource *res;
 167         int ret;
 168
 169         mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
 170         if (!mxsfb)
 171                 return -ENOMEM;
 172
 173         drm->dev_private = mxsfb;
 174         mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
 175
 176         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 177         mxsfb->base = devm_ioremap_resource(drm->dev, res);
 178         if (IS_ERR(mxsfb->base))
 179                 return PTR_ERR(mxsfb->base);
 180
 181         mxsfb->clk = devm_clk_get(drm->dev, NULL);
 182         if (IS_ERR(mxsfb->clk))
 183                 return PTR_ERR(mxsfb->clk);
 184
 185         mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
 186         if (IS_ERR(mxsfb->clk_axi))
 187                 mxsfb->clk_axi = NULL;
 188
 189         mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
 190         if (IS_ERR(mxsfb->clk_disp_axi))
 191                 mxsfb->clk_disp_axi = NULL;
 192
 193         ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
 194         if (ret)
 195                 return ret;
 196
 197         pm_runtime_enable(drm->dev);
 198
 199         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 200         if (ret < 0) {
 201                 dev_err(drm->dev, "Failed to initialise vblank\n");
 202                 goto err_vblank;
 203         }
 204
 205         /* Modeset init */
 206         drm_mode_config_init(drm);
 207
 208         ret = mxsfb_create_output(drm);
 209         if (ret < 0) {
 210                 dev_err(drm->dev, "Failed to create outputs\n");
 211                 goto err_vblank;
 212         }
 213
 214         ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
 215                         mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL,
 216                         &mxsfb->connector);
 217         if (ret < 0) {
 218                 dev_err(drm->dev, "Cannot setup simple display pipe\n");
 219                 goto err_vblank;
 220         }
 221
 222         ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
 223         if (ret) {
 224                 dev_err(drm->dev, "Cannot connect panel\n");
 225                 goto err_vblank;
 226         }
 227
 228         drm->mode_config.min_width      = MXSFB_MIN_XRES;
 229         drm->mode_config.min_height     = MXSFB_MIN_YRES;
 230         drm->mode_config.max_width      = MXSFB_MAX_XRES;
 231         drm->mode_config.max_height     = MXSFB_MAX_YRES;
 232         drm->mode_config.funcs          = &mxsfb_mode_config_funcs;
 233
 234         drm_mode_config_reset(drm);
 235
 236         pm_runtime_get_sync(drm->dev);
 237         ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
 238         pm_runtime_put_sync(drm->dev);
 239
 240         if (ret < 0) {
 241                 dev_err(drm->dev, "Failed to install IRQ handler\n");
 242                 goto err_irq;
 243         }
 244
 245         drm_kms_helper_poll_init(drm);
 246
 247         mxsfb->fbdev = drm_fbdev_cma_init(drm, 32,
 248                                           drm->mode_config.num_connector);
 249         if (IS_ERR(mxsfb->fbdev)) {
 250                 ret = PTR_ERR(mxsfb->fbdev);
 251                 mxsfb->fbdev = NULL;
 252                 dev_err(drm->dev, "Failed to init FB CMA area\n");
 253                 goto err_cma;
 254         }
 255
 256         platform_set_drvdata(pdev, drm);
 257
 258         drm_helper_hpd_irq_event(drm);
 259
 260         return 0;
 261
 262 err_cma:
 263         drm_irq_uninstall(drm);
 264 err_irq:
 265         drm_panel_detach(mxsfb->panel);
 266 err_vblank:
 267         pm_runtime_disable(drm->dev);
 268
 269         return ret;
 270 }
 271
 272 static void mxsfb_unload(struct drm_device *drm)
 273 {
 274         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 275
 276         if (mxsfb->fbdev)
 277                 drm_fbdev_cma_fini(mxsfb->fbdev);
 278
 279         drm_kms_helper_poll_fini(drm);
 280         drm_mode_config_cleanup(drm);
 281
 282         pm_runtime_get_sync(drm->dev);
 283         drm_irq_uninstall(drm);
 284         pm_runtime_put_sync(drm->dev);
 285
 286         drm->dev_private = NULL;
 287
 288         pm_runtime_disable(drm->dev);
 289 }
 290
 291 static void mxsfb_lastclose(struct drm_device *drm)
 292 {
 293         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 294
 295         drm_fbdev_cma_restore_mode(mxsfb->fbdev);
 296 }
 297
 298 static void mxsfb_irq_preinstall(struct drm_device *drm)
 299 {
 300         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 301
 302         mxsfb_pipe_disable_vblank(&mxsfb->pipe);
 303 }
 304
 305 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
 306 {
 307         struct drm_device *drm = data;
 308         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 309         u32 reg;
 310
 311         mxsfb_enable_axi_clk(mxsfb);
 312
 313         reg = readl(mxsfb->base + LCDC_CTRL1);
 314
 315         if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
 316                 drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
 317
 318         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 319
 320         mxsfb_disable_axi_clk(mxsfb);
 321
 322         return IRQ_HANDLED;
 323 }
 324
 325 DEFINE_DRM_GEM_CMA_FOPS(fops);
 326
 327 static struct drm_driver mxsfb_driver = {
 328         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 329                                   DRIVER_PRIME | DRIVER_ATOMIC |
 330                                   DRIVER_HAVE_IRQ,
 331         .lastclose              = mxsfb_lastclose,
 332         .irq_handler            = mxsfb_irq_handler,
 333         .irq_preinstall         = mxsfb_irq_preinstall,
 334         .irq_uninstall          = mxsfb_irq_preinstall,
 335         .gem_free_object_unlocked = drm_gem_cma_free_object,
 336         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 337         .dumb_create            = drm_gem_cma_dumb_create,
 338         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 339         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 340         .gem_prime_export       = drm_gem_prime_export,
 341         .gem_prime_import       = drm_gem_prime_import,
 342         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 343         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 344         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 345         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 346         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 347         .fops   = &fops,
 348         .name   = "mxsfb-drm",
 349         .desc   = "MXSFB Controller DRM",
 350         .date   = "20160824",
 351         .major  = 1,
 352         .minor  = 0,
 353 };
 354
 355 static const struct platform_device_id mxsfb_devtype[] = {
 356         { .name = "imx23-fb", .driver_data = MXSFB_V3, },
 357         { .name = "imx28-fb", .driver_data = MXSFB_V4, },
 358         { .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
 359         { /* sentinel */ }
 360 };
 361 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
 362
 363 static const struct of_device_id mxsfb_dt_ids[] = {
 364         { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
 365         { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
 366         { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
 367         { /* sentinel */ }
 368 };
 369 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
 370
 371 static int mxsfb_probe(struct platform_device *pdev)
 372 {
 373         struct drm_device *drm;
 374         const struct of_device_id *of_id =
 375                         of_match_device(mxsfb_dt_ids, &pdev->dev);
 376         int ret;
 377
 378         if (!pdev->dev.of_node)
 379                 return -ENODEV;
 380
 381         if (of_id)
 382                 pdev->id_entry = of_id->data;
 383
 384         drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
 385         if (IS_ERR(drm))
 386                 return PTR_ERR(drm);
 387
 388         ret = mxsfb_load(drm, 0);
 389         if (ret)
 390                 goto err_free;
 391
 392         ret = drm_dev_register(drm, 0);
 393         if (ret)
 394                 goto err_unload;
 395
 396         return 0;
 397
 398 err_unload:
 399         mxsfb_unload(drm);
 400 err_free:
 401         drm_dev_unref(drm);
 402
 403         return ret;
 404 }
 405
 406 static int mxsfb_remove(struct platform_device *pdev)
 407 {
 408         struct drm_device *drm = platform_get_drvdata(pdev);
 409
 410         drm_dev_unregister(drm);
 411         mxsfb_unload(drm);
 412         drm_dev_unref(drm);
 413
 414         return 0;
 415 }
 416
 417 static struct platform_driver mxsfb_platform_driver = {
 418         .probe          = mxsfb_probe,
 419         .remove         = mxsfb_remove,
 420         .id_table       = mxsfb_devtype,
 421         .driver = {
 422                 .name           = "mxsfb",
 423                 .of_match_table = mxsfb_dt_ids,
 424         },
 425 };
 426
 427 module_platform_driver(mxsfb_platform_driver);
 428
 429 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 430 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
 431 MODULE_LICENSE("GPL");