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_of.h>
  39 #include <drm/drm_panel.h>
  40 #include <drm/drm_simple_kms_helper.h>
  41
  42 #include "mxsfb_drv.h"
  43 #include "mxsfb_regs.h"
  44
  45 enum mxsfb_devtype {
  46         MXSFB_V3,
  47         MXSFB_V4,
  48 };
  49
  50 static const struct mxsfb_devdata mxsfb_devdata[] = {
  51         [MXSFB_V3] = {
  52                 .transfer_count = LCDC_V3_TRANSFER_COUNT,
  53                 .cur_buf        = LCDC_V3_CUR_BUF,
  54                 .next_buf       = LCDC_V3_NEXT_BUF,
  55                 .debug0         = LCDC_V3_DEBUG0,
  56                 .hs_wdth_mask   = 0xff,
  57                 .hs_wdth_shift  = 24,
  58                 .ipversion      = 3,
  59         },
  60         [MXSFB_V4] = {
  61                 .transfer_count = LCDC_V4_TRANSFER_COUNT,
  62                 .cur_buf        = LCDC_V4_CUR_BUF,
  63                 .next_buf       = LCDC_V4_NEXT_BUF,
  64                 .debug0         = LCDC_V4_DEBUG0,
  65                 .hs_wdth_mask   = 0x3fff,
  66                 .hs_wdth_shift  = 18,
  67                 .ipversion      = 4,
  68         },
  69 };
  70
  71 static const uint32_t mxsfb_formats[] = {
  72         DRM_FORMAT_XRGB8888,
  73         DRM_FORMAT_RGB565
  74 };
  75
  76 static struct mxsfb_drm_private *
  77 drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe)
  78 {
  79         return container_of(pipe, struct mxsfb_drm_private, pipe);
  80 }
  81
  82 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb)
  83 {
  84         if (mxsfb->clk_axi)
  85                 clk_prepare_enable(mxsfb->clk_axi);
  86 }
  87
  88 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb)
  89 {
  90         if (mxsfb->clk_axi)
  91                 clk_disable_unprepare(mxsfb->clk_axi);
  92 }
  93
  94 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = {
  95         .fb_create              = drm_fb_cma_create,
  96         .atomic_check           = drm_atomic_helper_check,
  97         .atomic_commit          = drm_atomic_helper_commit,
  98 };
  99
 100 static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe,
 101                               struct drm_crtc_state *crtc_state)
 102 {
 103         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 104
 105         mxsfb_crtc_enable(mxsfb);
 106 }
 107
 108 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe)
 109 {
 110         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 111
 112         mxsfb_crtc_disable(mxsfb);
 113 }
 114
 115 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe,
 116                               struct drm_plane_state *plane_state)
 117 {
 118         struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe);
 119
 120         mxsfb_plane_atomic_update(mxsfb, plane_state);
 121 }
 122
 123 static int mxsfb_pipe_prepare_fb(struct drm_simple_display_pipe *pipe,
 124                                  struct drm_plane_state *plane_state)
 125 {
 126         return drm_fb_cma_prepare_fb(&pipe->plane, plane_state);
 127 }
 128
 129 struct drm_simple_display_pipe_funcs mxsfb_funcs = {
 130         .enable         = mxsfb_pipe_enable,
 131         .disable        = mxsfb_pipe_disable,
 132         .update         = mxsfb_pipe_update,
 133         .prepare_fb     = mxsfb_pipe_prepare_fb,
 134 };
 135
 136 static int mxsfb_load(struct drm_device *drm, unsigned long flags)
 137 {
 138         struct platform_device *pdev = to_platform_device(drm->dev);
 139         struct mxsfb_drm_private *mxsfb;
 140         struct resource *res;
 141         int ret;
 142
 143         mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL);
 144         if (!mxsfb)
 145                 return -ENOMEM;
 146
 147         drm->dev_private = mxsfb;
 148         mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data];
 149
 150         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 151         mxsfb->base = devm_ioremap_resource(drm->dev, res);
 152         if (IS_ERR(mxsfb->base))
 153                 return PTR_ERR(mxsfb->base);
 154
 155         mxsfb->clk = devm_clk_get(drm->dev, NULL);
 156         if (IS_ERR(mxsfb->clk))
 157                 return PTR_ERR(mxsfb->clk);
 158
 159         mxsfb->clk_axi = devm_clk_get(drm->dev, "axi");
 160         if (IS_ERR(mxsfb->clk_axi))
 161                 mxsfb->clk_axi = NULL;
 162
 163         mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi");
 164         if (IS_ERR(mxsfb->clk_disp_axi))
 165                 mxsfb->clk_disp_axi = NULL;
 166
 167         ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32));
 168         if (ret)
 169                 return ret;
 170
 171         pm_runtime_enable(drm->dev);
 172
 173         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
 174         if (ret < 0) {
 175                 dev_err(drm->dev, "Failed to initialise vblank\n");
 176                 goto err_vblank;
 177         }
 178
 179         /* Modeset init */
 180         drm_mode_config_init(drm);
 181
 182         ret = mxsfb_create_output(drm);
 183         if (ret < 0) {
 184                 dev_err(drm->dev, "Failed to create outputs\n");
 185                 goto err_vblank;
 186         }
 187
 188         ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs,
 189                         mxsfb_formats, ARRAY_SIZE(mxsfb_formats),
 190                         &mxsfb->connector);
 191         if (ret < 0) {
 192                 dev_err(drm->dev, "Cannot setup simple display pipe\n");
 193                 goto err_vblank;
 194         }
 195
 196         ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector);
 197         if (ret) {
 198                 dev_err(drm->dev, "Cannot connect panel\n");
 199                 goto err_vblank;
 200         }
 201
 202         drm->mode_config.min_width      = MXSFB_MIN_XRES;
 203         drm->mode_config.min_height     = MXSFB_MIN_YRES;
 204         drm->mode_config.max_width      = MXSFB_MAX_XRES;
 205         drm->mode_config.max_height     = MXSFB_MAX_YRES;
 206         drm->mode_config.funcs          = &mxsfb_mode_config_funcs;
 207
 208         drm_mode_config_reset(drm);
 209
 210         pm_runtime_get_sync(drm->dev);
 211         ret = drm_irq_install(drm, platform_get_irq(pdev, 0));
 212         pm_runtime_put_sync(drm->dev);
 213
 214         if (ret < 0) {
 215                 dev_err(drm->dev, "Failed to install IRQ handler\n");
 216                 goto err_irq;
 217         }
 218
 219         drm_kms_helper_poll_init(drm);
 220
 221         mxsfb->fbdev = drm_fbdev_cma_init(drm, 32,
 222                                           drm->mode_config.num_connector);
 223         if (IS_ERR(mxsfb->fbdev)) {
 224                 mxsfb->fbdev = NULL;
 225                 dev_err(drm->dev, "Failed to init FB CMA area\n");
 226                 goto err_cma;
 227         }
 228
 229         platform_set_drvdata(pdev, drm);
 230
 231         drm_helper_hpd_irq_event(drm);
 232
 233         return 0;
 234
 235 err_cma:
 236         drm_irq_uninstall(drm);
 237 err_irq:
 238         drm_panel_detach(mxsfb->panel);
 239 err_vblank:
 240         pm_runtime_disable(drm->dev);
 241
 242         return ret;
 243 }
 244
 245 static void mxsfb_unload(struct drm_device *drm)
 246 {
 247         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 248
 249         if (mxsfb->fbdev)
 250                 drm_fbdev_cma_fini(mxsfb->fbdev);
 251
 252         drm_kms_helper_poll_fini(drm);
 253         drm_mode_config_cleanup(drm);
 254         drm_vblank_cleanup(drm);
 255
 256         pm_runtime_get_sync(drm->dev);
 257         drm_irq_uninstall(drm);
 258         pm_runtime_put_sync(drm->dev);
 259
 260         drm->dev_private = NULL;
 261
 262         pm_runtime_disable(drm->dev);
 263 }
 264
 265 static void mxsfb_lastclose(struct drm_device *drm)
 266 {
 267         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 268
 269         drm_fbdev_cma_restore_mode(mxsfb->fbdev);
 270 }
 271
 272 static int mxsfb_enable_vblank(struct drm_device *drm, unsigned int crtc)
 273 {
 274         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 275
 276         /* Clear and enable VBLANK IRQ */
 277         mxsfb_enable_axi_clk(mxsfb);
 278         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 279         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET);
 280         mxsfb_disable_axi_clk(mxsfb);
 281
 282         return 0;
 283 }
 284
 285 static void mxsfb_disable_vblank(struct drm_device *drm, unsigned int crtc)
 286 {
 287         struct mxsfb_drm_private *mxsfb = drm->dev_private;
 288
 289         /* Disable and clear VBLANK IRQ */
 290         mxsfb_enable_axi_clk(mxsfb);
 291         writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 292         writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR);
 293         mxsfb_disable_axi_clk(mxsfb);
 294 }
 295
 296 static void mxsfb_irq_preinstall(struct drm_device *drm)
 297 {
 298         mxsfb_disable_vblank(drm, 0);
 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 static const struct file_operations fops = {
 322         .owner          = THIS_MODULE,
 323         .open           = drm_open,
 324         .release        = drm_release,
 325         .unlocked_ioctl = drm_ioctl,
 326 #ifdef CONFIG_COMPAT
 327         .compat_ioctl   = drm_compat_ioctl,
 328 #endif
 329         .poll           = drm_poll,
 330         .read           = drm_read,
 331         .llseek         = noop_llseek,
 332         .mmap           = drm_gem_cma_mmap,
 333 };
 334
 335 static struct drm_driver mxsfb_driver = {
 336         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
 337                                   DRIVER_PRIME | DRIVER_ATOMIC |
 338                                   DRIVER_HAVE_IRQ,
 339         .lastclose              = mxsfb_lastclose,
 340         .irq_handler            = mxsfb_irq_handler,
 341         .irq_preinstall         = mxsfb_irq_preinstall,
 342         .irq_uninstall          = mxsfb_irq_preinstall,
 343         .get_vblank_counter     = drm_vblank_no_hw_counter,
 344         .enable_vblank          = mxsfb_enable_vblank,
 345         .disable_vblank         = mxsfb_disable_vblank,
 346         .gem_free_object        = drm_gem_cma_free_object,
 347         .gem_vm_ops             = &drm_gem_cma_vm_ops,
 348         .dumb_create            = drm_gem_cma_dumb_create,
 349         .dumb_map_offset        = drm_gem_cma_dumb_map_offset,
 350         .dumb_destroy           = drm_gem_dumb_destroy,
 351         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
 352         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
 353         .gem_prime_export       = drm_gem_prime_export,
 354         .gem_prime_import       = drm_gem_prime_import,
 355         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 356         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 357         .gem_prime_vmap         = drm_gem_cma_prime_vmap,
 358         .gem_prime_vunmap       = drm_gem_cma_prime_vunmap,
 359         .gem_prime_mmap         = drm_gem_cma_prime_mmap,
 360         .fops   = &fops,
 361         .name   = "mxsfb-drm",
 362         .desc   = "MXSFB Controller DRM",
 363         .date   = "20160824",
 364         .major  = 1,
 365         .minor  = 0,
 366 };
 367
 368 static const struct platform_device_id mxsfb_devtype[] = {
 369         { .name = "imx23-fb", .driver_data = MXSFB_V3, },
 370         { .name = "imx28-fb", .driver_data = MXSFB_V4, },
 371         { .name = "imx6sx-fb", .driver_data = MXSFB_V4, },
 372         { /* sentinel */ }
 373 };
 374 MODULE_DEVICE_TABLE(platform, mxsfb_devtype);
 375
 376 static const struct of_device_id mxsfb_dt_ids[] = {
 377         { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], },
 378         { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], },
 379         { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], },
 380         { /* sentinel */ }
 381 };
 382 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids);
 383
 384 static int mxsfb_probe(struct platform_device *pdev)
 385 {
 386         struct drm_device *drm;
 387         const struct of_device_id *of_id =
 388                         of_match_device(mxsfb_dt_ids, &pdev->dev);
 389         int ret;
 390
 391         if (!pdev->dev.of_node)
 392                 return -ENODEV;
 393
 394         if (of_id)
 395                 pdev->id_entry = of_id->data;
 396
 397         drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev);
 398         if (IS_ERR(drm))
 399                 return PTR_ERR(drm);
 400
 401         ret = mxsfb_load(drm, 0);
 402         if (ret)
 403                 goto err_free;
 404
 405         ret = drm_dev_register(drm, 0);
 406         if (ret)
 407                 goto err_unload;
 408
 409         return 0;
 410
 411 err_unload:
 412         mxsfb_unload(drm);
 413 err_free:
 414         drm_dev_unref(drm);
 415
 416         return ret;
 417 }
 418
 419 static int mxsfb_remove(struct platform_device *pdev)
 420 {
 421         struct drm_device *drm = platform_get_drvdata(pdev);
 422
 423         drm_dev_unregister(drm);
 424         mxsfb_unload(drm);
 425         drm_dev_unref(drm);
 426
 427         return 0;
 428 }
 429
 430 static struct platform_driver mxsfb_platform_driver = {
 431         .probe          = mxsfb_probe,
 432         .remove         = mxsfb_remove,
 433         .id_table       = mxsfb_devtype,
 434         .driver = {
 435                 .name           = "mxsfb",
 436                 .of_match_table = mxsfb_dt_ids,
 437         },
 438 };
 439
 440 module_platform_driver(mxsfb_platform_driver);
 441
 442 MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
 443 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver");
 444 MODULE_LICENSE("GPL");