drivers/gpu/drm/mxsfb/mxsfb_drv.c

   1 /*
   2  * Copyright (C) 2016 Marek Vasut <[email protected]>
   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 int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe)
 135 {
 136         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 137
 138         /* Clear and enable VBLANK IRQ */
 139         mxsfb_enable_axi_clk(mxsfb);
 140         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 141         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
 142         mxsfb_disable_axi_clk(mxsfb);
 143
 144         return 0;
 145 }
 146
 147 static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe)
 148 {
 149         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 150
 151         /* Disable and clear VBLANK IRQ */
 152         mxsfb_enable_axi_clk(mxsfb);
 153         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 154         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 155         mxsfb_disable_axi_clk(mxsfb);
 156 }
 157
 158 static struct drm_simple_display_pipe_funcs mxsfb_funcs = {
 159         .enable         = mxsfb_pipe_enable,
 160         .disable        = mxsfb_pipe_disable,
 161         .update         = mxsfb_pipe_update,
 162         .prepare_fb     = mxsfb_pipe_prepare_fb,
 163         .enable_vblank  = mxsfb_pipe_enable_vblank,
 164         .disable_vblank = mxsfb_pipe_disable_vblank,
 165 };
 166
 167 static int mxsfb_load(struct drm_device *drm, unsigned long flags)
 168 {
 169         struct platform_device *pdev = to_platform_device(drm->dev);
 170         struct mxsfb_drm_private *mxsfb;
 171         struct resource *res;
 172         int ret;
 173
 174         mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
 175         if (!mxsfb)
 176                 return -ENOMEM;
 177
 178         drm->dev_private = mxsfb;
 179         mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
 180
 181         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 182         mxsfb->base = devm_ioremap_resource(drm->dev, res);
 183         if (IS_ERR(mxsfb->base))
 184                 return PTR_ERR(mxsfb->base);
 185
 186         mxsfb->clk = devm_clk_get(drm->dev, NULL);
 187         if (IS_ERR(mxsfb->clk))
 188                 return PTR_ERR(mxsfb->clk);
 189
 190         mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
 191         if (IS_ERR(mxsfb->clk_axi))
 192                 mxsfb->clk_axi = NULL;
 193
 194         mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
 195         if (IS_ERR(mxsfb->clk_disp_axi))
 196                 mxsfb->clk_disp_axi = NULL;
 197
 198         ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
 199         if (ret)
 200                 return ret;
 201
 202         pm_runtime_enable(drm->dev);
 203
 204         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 205         if (ret < 0) {
 206                 dev_err(drm->dev, "Failed to initialise vblank\n");
 207                 goto err_vblank;
 208         }
 209
 210         /* Modeset init */
 211         drm_mode_config_init(drm);
 212
 213         ret = mxsfb_create_output(drm);
 214         if (ret < 0) {
 215                 dev_err(drm->dev, "Failed to create outputs\n");
 216                 goto err_vblank;
 217         }
 218
 219         ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
 220                         mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL,
 221                         &mxsfb->connector);
 222         if (ret < 0) {
 223                 dev_err(drm->dev, "Cannot setup simple display pipe\n");
 224                 goto err_vblank;
 225         }
 226
 227         ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
 228         if (ret) {
 229                 dev_err(drm->dev, "Cannot connect panel\n");
 230                 goto err_vblank;
 231         }
 232
 233         drm->mode_config.min_width      = MXSFB_MIN_XRES;
 234         drm->mode_config.min_height     = MXSFB_MIN_YRES;
 235         drm->mode_config.max_width      = MXSFB_MAX_XRES;
 236         drm->mode_config.max_height     = MXSFB_MAX_YRES;
 237         drm->mode_config.funcs          = &mxsfb_mode_config_funcs;
 238
 239         drm_mode_config_reset(drm);
 240
 241         pm_runtime_get_sync(drm->dev);
 242         ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
 243         pm_runtime_put_sync(drm->dev);
 244
 245         if (ret < 0) {
 246                 dev_err(drm->dev, "Failed to install IRQ handler\n");
 247                 goto err_irq;
 248         }
 249
 250         drm_kms_helper_poll_init(drm);
 251
 252         mxsfb->fbdev = drm_fbdev_cma_init(drm, 32,
 253                                           drm->mode_config.num_connector);
 254         if (IS_ERR(mxsfb->fbdev)) {
 255                 ret = PTR_ERR(mxsfb->fbdev);
 256                 mxsfb->fbdev = NULL;
 257                 dev_err(drm->dev, "Failed to init FB CMA area\n");
 258                 goto err_cma;
 259         }
 260
 261         platform_set_drvdata(pdev, drm);
 262
 263         drm_helper_hpd_irq_event(drm);
 264
 265         return 0;
 266
 267 err_cma:
 268         drm_irq_uninstall(drm);
 269 err_irq:
 270         drm_panel_detach(mxsfb->panel);
 271 err_vblank:
 272         pm_runtime_disable(drm->dev);
 273
 274         return ret;
 275 }
 276
 277 static void mxsfb_unload(struct drm_device *drm)
 278 {
 279         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 280
 281         if (mxsfb->fbdev)
 282                 drm_fbdev_cma_fini(mxsfb->fbdev);
 283
 284         drm_kms_helper_poll_fini(drm);
 285         drm_mode_config_cleanup(drm);
 286
 287         pm_runtime_get_sync(drm->dev);
 288         drm_irq_uninstall(drm);
 289         pm_runtime_put_sync(drm->dev);
 290
 291         drm->dev_private = NULL;
 292
 293         pm_runtime_disable(drm->dev);
 294 }
 295
 296 static void mxsfb_lastclose(struct drm_device *drm)
 297 {
 298         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 299
 300         drm_fbdev_cma_restore_mode(mxsfb->fbdev);
 301 }
 302
 303 static void mxsfb_irq_preinstall(struct drm_device *drm)
 304 {
 305         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 306
 307         mxsfb_pipe_disable_vblank(&mxsfb->pipe);
 308 }
 309
 310 static irqreturn_t mxsfb_irq_handler(int irq, void *data)
 311 {
 312         struct drm_device *drm = data;
 313         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 314         u32 reg;
 315
 316         mxsfb_enable_axi_clk(mxsfb);
 317
 318         reg = readl(mxsfb->base + LCDC_CTRL1);
 319
 320         if (reg & CTRL1_CUR_FRAME_DONE_IRQ)
 321                 drm_crtc_handle_vblank(&mxsfb->pipe.crtc);
 322
 323         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 324
 325         mxsfb_disable_axi_clk(mxsfb);
 326
 327         return IRQ_HANDLED;
 328 }
 329
 330 DEFINE_DRM_GEM_CMA_FOPS(fops);
 331
 332 static struct drm_driver mxsfb_driver = {
 333         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 334                                   DRIVER_PRIME | DRIVER_ATOMIC |
 335                                   DRIVER_HAVE_IRQ,
 336         .lastclose              = mxsfb_lastclose,
 337         .irq_handler            = mxsfb_irq_handler,
 338         .irq_preinstall         = mxsfb_irq_preinstall,
 339         .irq_uninstall          = mxsfb_irq_preinstall,
 340         .gem_free_object_unlocked = drm_gem_cma_free_object,
 341         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 342         .dumb_create            = drm_gem_cma_dumb_create,
 343         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 344         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 345         .gem_prime_export       = drm_gem_prime_export,
 346         .gem_prime_import       = drm_gem_prime_import,
 347         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 348         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 349         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 350         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 351         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 352         .fops   = &fops,
 353         .name   = "mxsfb-drm",
 354         .desc   = "MXSFB Controller DRM",
 355         .date   = "20160824",
 356         .major  = 1,
 357         .minor  = 0,
 358 };
 359
 360 static const struct platform_device_id mxsfb_devtype[] = {
 361         { .name = "imx23-fb", .driver_data = MXSFB_V3, },
 362         { .name = "imx28-fb", .driver_data = MXSFB_V4, },
 363         { .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
 364         { /* sentinel */ }
 365 };
 366 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
 367
 368 static const struct of_device_id mxsfb_dt_ids[] = {
 369         { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
 370         { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
 371         { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
 372         { /* sentinel */ }
 373 };
 374 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
 375
 376 static int mxsfb_probe(struct platform_device *pdev)
 377 {
 378         struct drm_device *drm;
 379         const struct of_device_id *of_id =
 380                         of_match_device(mxsfb_dt_ids, &pdev->dev);
 381         int ret;
 382
 383         if (!pdev->dev.of_node)
 384                 return -ENODEV;
 385
 386         if (of_id)
 387                 pdev->id_entry = of_id->data;
 388
 389         drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
 390         if (IS_ERR(drm))
 391                 return PTR_ERR(drm);
 392
 393         ret = mxsfb_load(drm, 0);
 394         if (ret)
 395                 goto err_free;
 396
 397         ret = drm_dev_register(drm, 0);
 398         if (ret)
 399                 goto err_unload;
 400
 401         return 0;
 402
 403 err_unload:
 404         mxsfb_unload(drm);
 405 err_free:
 406         drm_dev_unref(drm);
 407
 408         return ret;
 409 }
 410
 411 static int mxsfb_remove(struct platform_device *pdev)
 412 {
 413         struct drm_device *drm = platform_get_drvdata(pdev);
 414
 415         drm_dev_unregister(drm);
 416         mxsfb_unload(drm);
 417         drm_dev_unref(drm);
 418
 419         return 0;
 420 }
 421
 422 static struct platform_driver mxsfb_platform_driver = {
 423         .probe          = mxsfb_probe,
 424         .remove         = mxsfb_remove,
 425         .id_table       = mxsfb_devtype,
 426         .driver = {
 427                 .name           = "mxsfb",
 428                 .of_match_table = mxsfb_dt_ids,
 429         },
 430 };
 431
 432 module_platform_driver(mxsfb_platform_driver);
 433
 434 MODULE_AUTHOR("Marek Vasut <[email protected]>");
 435 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
 436 MODULE_LICENSE("GPL");