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