drivers/staging/imx-drm/ipuv3-crtc.c

   1 /*
   2  * i.MX IPUv3 Graphics driver
   3  *
   4  * Copyright (C) 2011 Sascha Hauer, Pengutronix
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  18  * MA 02110-1301, USA.
  19  */
  20 #include <linux/module.h>
  21 #include <linux/export.h>
  22 #include <linux/device.h>
  23 #include <linux/platform_device.h>
  24 #include <drm/drmP.h>
  25 #include <drm/drm_fb_helper.h>
  26 #include <drm/drm_crtc_helper.h>
  27 #include <linux/fb.h>
  28 #include <linux/clk.h>
  29 #include <drm/drm_gem_cma_helper.h>
  30 #include <drm/drm_fb_cma_helper.h>
  31
  32 #include "ipu-v3/imx-ipu-v3.h"
  33 #include "imx-drm.h"
  34
  35 #define DRIVER_DESC             "i.MX IPUv3 Graphics"
  36
  37 struct ipu_framebuffer {
  38         struct drm_framebuffer  base;
  39         void                    *virt;
  40         dma_addr_t              phys;
  41         size_t                  len;
  42 };
  43
  44 struct ipu_crtc {
  45         struct drm_fb_helper    fb_helper;
  46         struct ipu_framebuffer  ifb;
  47         int                     num_crtcs;
  48         struct device           *dev;
  49         struct drm_crtc         base;
  50         struct imx_drm_crtc     *imx_crtc;
  51         struct ipuv3_channel    *ipu_ch;
  52         struct ipu_dc           *dc;
  53         struct ipu_dp           *dp;
  54         struct dmfc_channel     *dmfc;
  55         struct ipu_di           *di;
  56         int                     enabled;
  57         struct ipu_priv         *ipu_priv;
  58         struct drm_pending_vblank_event *page_flip_event;
  59         struct drm_framebuffer  *newfb;
  60         int                     irq;
  61         u32                     interface_pix_fmt;
  62         unsigned long           di_clkflags;
  63 };
  64
  65 #define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)
  66
  67 static int calc_vref(struct drm_display_mode *mode)
  68 {
  69         unsigned long htotal, vtotal;
  70
  71         htotal = mode->htotal;
  72         vtotal = mode->vtotal;
  73
  74         if (!htotal || !vtotal)
  75                 return 60;
  76
  77         return mode->clock * 1000 / vtotal / htotal;
  78 }
  79
  80 static int calc_bandwidth(struct drm_display_mode *mode, unsigned int vref)
  81 {
  82         return mode->hdisplay * mode->vdisplay * vref;
  83 }
  84
  85 static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
  86 {
  87         if (ipu_crtc->enabled)
  88                 return;
  89
  90         ipu_di_enable(ipu_crtc->di);
  91         ipu_dmfc_enable_channel(ipu_crtc->dmfc);
  92         ipu_idmac_enable_channel(ipu_crtc->ipu_ch);
  93         ipu_dc_enable_channel(ipu_crtc->dc);
  94         if (ipu_crtc->dp)
  95                 ipu_dp_enable_channel(ipu_crtc->dp);
  96
  97         ipu_crtc->enabled = 1;
  98 }
  99
 100 static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
 101 {
 102         if (!ipu_crtc->enabled)
 103                 return;
 104
 105         if (ipu_crtc->dp)
 106                 ipu_dp_disable_channel(ipu_crtc->dp);
 107         ipu_dc_disable_channel(ipu_crtc->dc);
 108         ipu_idmac_disable_channel(ipu_crtc->ipu_ch);
 109         ipu_dmfc_disable_channel(ipu_crtc->dmfc);
 110         ipu_di_disable(ipu_crtc->di);
 111
 112         ipu_crtc->enabled = 0;
 113 }
 114
 115 static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
 116 {
 117         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 118
 119         dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);
 120
 121         switch (mode) {
 122         case DRM_MODE_DPMS_ON:
 123                 ipu_fb_enable(ipu_crtc);
 124                 break;
 125         case DRM_MODE_DPMS_STANDBY:
 126         case DRM_MODE_DPMS_SUSPEND:
 127         case DRM_MODE_DPMS_OFF:
 128                 ipu_fb_disable(ipu_crtc);
 129                 break;
 130         }
 131 }
 132
 133 static int ipu_page_flip(struct drm_crtc *crtc,
 134                 struct drm_framebuffer *fb,
 135                 struct drm_pending_vblank_event *event)
 136 {
 137         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 138         int ret;
 139
 140         if (ipu_crtc->newfb)
 141                 return -EBUSY;
 142
 143         ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
 144         if (ret) {
 145                 dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
 146                 list_del(&event->base.link);
 147
 148                 return ret;
 149         }
 150
 151         ipu_crtc->newfb = fb;
 152         ipu_crtc->page_flip_event = event;
 153
 154         return 0;
 155 }
 156
 157 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 158         .set_config = drm_crtc_helper_set_config,
 159         .destroy = drm_crtc_cleanup,
 160         .page_flip = ipu_page_flip,
 161 };
 162
 163 static int ipu_drm_set_base(struct drm_crtc *crtc, int x, int y)
 164 {
 165         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 166         struct drm_gem_cma_object *cma_obj;
 167         struct drm_framebuffer *fb = crtc->fb;
 168         unsigned long phys;
 169
 170         cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
 171         if (!cma_obj) {
 172                 DRM_LOG_KMS("entry is null.\n");
 173                 return -EFAULT;
 174         }
 175
 176         phys = cma_obj->paddr;
 177         phys += x * (fb->bits_per_pixel >> 3);
 178         phys += y * fb->pitches[0];
 179
 180         dev_dbg(ipu_crtc->dev, "%s: phys: 0x%lx\n", __func__, phys);
 181         dev_dbg(ipu_crtc->dev, "%s: xy: %dx%d\n", __func__, x, y);
 182
 183         ipu_cpmem_set_stride(ipu_get_cpmem(ipu_crtc->ipu_ch), fb->pitches[0]);
 184         ipu_cpmem_set_buffer(ipu_get_cpmem(ipu_crtc->ipu_ch),
 185                           0, phys);
 186
 187         return 0;
 188 }
 189
 190 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 191                                struct drm_display_mode *orig_mode,
 192                                struct drm_display_mode *mode,
 193                                int x, int y,
 194                                struct drm_framebuffer *old_fb)
 195 {
 196         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 197         struct drm_framebuffer *fb = ipu_crtc->base.fb;
 198         int ret;
 199         struct ipu_di_signal_cfg sig_cfg = {};
 200         u32 out_pixel_fmt;
 201         struct ipu_ch_param __iomem *cpmem = ipu_get_cpmem(ipu_crtc->ipu_ch);
 202         int bpp;
 203         u32 v4l2_fmt;
 204
 205         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 206                         mode->hdisplay);
 207         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 208                         mode->vdisplay);
 209
 210         ipu_ch_param_zero(cpmem);
 211
 212         switch (fb->pixel_format) {
 213         case DRM_FORMAT_XRGB8888:
 214         case DRM_FORMAT_ARGB8888:
 215                 v4l2_fmt = V4L2_PIX_FMT_RGB32;
 216                 bpp = 32;
 217                 break;
 218         case DRM_FORMAT_RGB565:
 219                 v4l2_fmt = V4L2_PIX_FMT_RGB565;
 220                 bpp = 16;
 221                 break;
 222         case DRM_FORMAT_RGB888:
 223                 v4l2_fmt = V4L2_PIX_FMT_RGB24;
 224                 bpp = 24;
 225                 break;
 226         default:
 227                 dev_err(ipu_crtc->dev, "unsupported pixel format 0x%08x\n",
 228                                 fb->pixel_format);
 229                 return -EINVAL;
 230         }
 231
 232         out_pixel_fmt = ipu_crtc->interface_pix_fmt;
 233
 234         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 235                 sig_cfg.interlaced = 1;
 236         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 237                 sig_cfg.Hsync_pol = 1;
 238         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 239                 sig_cfg.Vsync_pol = 1;
 240
 241         sig_cfg.enable_pol = 1;
 242         sig_cfg.clk_pol = 0;
 243         sig_cfg.width = mode->hdisplay;
 244         sig_cfg.height = mode->vdisplay;
 245         sig_cfg.pixel_fmt = out_pixel_fmt;
 246         sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
 247         sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
 248         sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;
 249
 250         sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
 251         sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
 252         sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
 253         sig_cfg.pixelclock = mode->clock * 1000;
 254         sig_cfg.clkflags = ipu_crtc->di_clkflags;
 255
 256         sig_cfg.v_to_h_sync = 0;
 257
 258         if (ipu_crtc->dp) {
 259                 ret = ipu_dp_setup_channel(ipu_crtc->dp, IPUV3_COLORSPACE_RGB,
 260                                 IPUV3_COLORSPACE_RGB);
 261                 if (ret) {
 262                         dev_err(ipu_crtc->dev,
 263                                 "initializing display processor failed with %d\n",
 264                                 ret);
 265                         return ret;
 266                 }
 267                 ipu_dp_set_global_alpha(ipu_crtc->dp, 1, 0, 1);
 268         }
 269
 270         ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
 271                         out_pixel_fmt, mode->hdisplay);
 272         if (ret) {
 273                 dev_err(ipu_crtc->dev,
 274                                 "initializing display controller failed with %d\n",
 275                                 ret);
 276                 return ret;
 277         }
 278
 279         ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 280         if (ret) {
 281                 dev_err(ipu_crtc->dev,
 282                                 "initializing panel failed with %d\n", ret);
 283                 return ret;
 284         }
 285
 286         ipu_cpmem_set_resolution(cpmem, mode->hdisplay, mode->vdisplay);
 287         ipu_cpmem_set_fmt(cpmem, v4l2_fmt);
 288         ipu_cpmem_set_high_priority(ipu_crtc->ipu_ch);
 289
 290         ret = ipu_dmfc_init_channel(ipu_crtc->dmfc, mode->hdisplay);
 291         if (ret) {
 292                 dev_err(ipu_crtc->dev,
 293                                 "initializing dmfc channel failed with %d\n",
 294                                 ret);
 295                 return ret;
 296         }
 297
 298         ret = ipu_dmfc_alloc_bandwidth(ipu_crtc->dmfc,
 299                         calc_bandwidth(mode, calc_vref(mode)), 64);
 300         if (ret) {
 301                 dev_err(ipu_crtc->dev,
 302                                 "allocating dmfc bandwidth failed with %d\n",
 303                                 ret);
 304                 return ret;
 305         }
 306
 307         ipu_drm_set_base(crtc, x, y);
 308
 309         return 0;
 310 }
 311
 312 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
 313 {
 314         struct drm_pending_vblank_event *e;
 315         struct timeval now;
 316         unsigned long flags;
 317         struct drm_device *drm = ipu_crtc->base.dev;
 318
 319         spin_lock_irqsave(&drm->event_lock, flags);
 320
 321         e = ipu_crtc->page_flip_event;
 322         if (!e) {
 323                 spin_unlock_irqrestore(&drm->event_lock, flags);
 324                 return;
 325         }
 326
 327         do_gettimeofday(&now);
 328         e->event.sequence = 0;
 329         e->event.tv_sec = now.tv_sec;
 330         e->event.tv_usec = now.tv_usec;
 331         ipu_crtc->page_flip_event = NULL;
 332
 333         imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
 334
 335         list_add_tail(&e->base.link, &e->base.file_priv->event_list);
 336
 337         wake_up_interruptible(&e->base.file_priv->event_wait);
 338
 339         spin_unlock_irqrestore(&drm->event_lock, flags);
 340 }
 341
 342 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 343 {
 344         struct ipu_crtc *ipu_crtc = dev_id;
 345
 346         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 347
 348         if (ipu_crtc->newfb) {
 349                 ipu_crtc->base.fb = ipu_crtc->newfb;
 350                 ipu_crtc->newfb = NULL;
 351                 ipu_drm_set_base(&ipu_crtc->base, 0, 0);
 352                 ipu_crtc_handle_pageflip(ipu_crtc);
 353         }
 354
 355         return IRQ_HANDLED;
 356 }
 357
 358 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 359                                   const struct drm_display_mode *mode,
 360                                   struct drm_display_mode *adjusted_mode)
 361 {
 362         return true;
 363 }
 364
 365 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 366 {
 367         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 368
 369         ipu_fb_disable(ipu_crtc);
 370 }
 371
 372 static void ipu_crtc_commit(struct drm_crtc *crtc)
 373 {
 374         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 375
 376         ipu_fb_enable(ipu_crtc);
 377 }
 378
 379 static void ipu_crtc_load_lut(struct drm_crtc *crtc)
 380 {
 381 }
 382
 383 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 384         .dpms = ipu_crtc_dpms,
 385         .mode_fixup = ipu_crtc_mode_fixup,
 386         .mode_set = ipu_crtc_mode_set,
 387         .prepare = ipu_crtc_prepare,
 388         .commit = ipu_crtc_commit,
 389         .load_lut = ipu_crtc_load_lut,
 390 };
 391
 392 static int ipu_enable_vblank(struct drm_crtc *crtc)
 393 {
 394         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 395
 396         enable_irq(ipu_crtc->irq);
 397
 398         return 0;
 399 }
 400
 401 static void ipu_disable_vblank(struct drm_crtc *crtc)
 402 {
 403         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 404
 405         disable_irq(ipu_crtc->irq);
 406 }
 407
 408 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
 409                 u32 pixfmt)
 410 {
 411         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 412
 413         ipu_crtc->interface_pix_fmt = pixfmt;
 414
 415         switch (encoder_type) {
 416         case DRM_MODE_ENCODER_LVDS:
 417                 ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
 418                         IPU_DI_CLKMODE_EXT;
 419                 break;
 420         case DRM_MODE_ENCODER_NONE:
 421                 ipu_crtc->di_clkflags = 0;
 422                 break;
 423         }
 424
 425         return 0;
 426 }
 427
 428 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 429         .enable_vblank = ipu_enable_vblank,
 430         .disable_vblank = ipu_disable_vblank,
 431         .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 432         .crtc_funcs = &ipu_crtc_funcs,
 433         .crtc_helper_funcs = &ipu_helper_funcs,
 434 };
 435
 436 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 437 {
 438         if (!IS_ERR_OR_NULL(ipu_crtc->ipu_ch))
 439                 ipu_idmac_put(ipu_crtc->ipu_ch);
 440         if (!IS_ERR_OR_NULL(ipu_crtc->dmfc))
 441                 ipu_dmfc_put(ipu_crtc->dmfc);
 442         if (!IS_ERR_OR_NULL(ipu_crtc->dp))
 443                 ipu_dp_put(ipu_crtc->dp);
 444         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 445                 ipu_di_put(ipu_crtc->di);
 446 }
 447
 448 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 449                 struct ipu_client_platformdata *pdata)
 450 {
 451         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 452         int ret;
 453
 454         ipu_crtc->ipu_ch = ipu_idmac_get(ipu, pdata->dma[0]);
 455         if (IS_ERR(ipu_crtc->ipu_ch)) {
 456                 ret = PTR_ERR(ipu_crtc->ipu_ch);
 457                 goto err_out;
 458         }
 459
 460         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 461         if (IS_ERR(ipu_crtc->dc)) {
 462                 ret = PTR_ERR(ipu_crtc->dc);
 463                 goto err_out;
 464         }
 465
 466         ipu_crtc->dmfc = ipu_dmfc_get(ipu, pdata->dma[0]);
 467         if (IS_ERR(ipu_crtc->dmfc)) {
 468                 ret = PTR_ERR(ipu_crtc->dmfc);
 469                 goto err_out;
 470         }
 471
 472         if (pdata->dp >= 0) {
 473                 ipu_crtc->dp = ipu_dp_get(ipu, pdata->dp);
 474                 if (IS_ERR(ipu_crtc->dp)) {
 475                         ret = PTR_ERR(ipu_crtc->dp);
 476                         goto err_out;
 477                 }
 478         }
 479
 480         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 481         if (IS_ERR(ipu_crtc->di)) {
 482                 ret = PTR_ERR(ipu_crtc->di);
 483                 goto err_out;
 484         }
 485
 486         ipu_crtc->irq = ipu_idmac_channel_irq(ipu, ipu_crtc->ipu_ch,
 487                         IPU_IRQ_EOF);
 488         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 489                         "imx_drm", ipu_crtc);
 490         if (ret < 0) {
 491                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 492                 goto err_out;
 493         }
 494
 495         disable_irq(ipu_crtc->irq);
 496
 497         return 0;
 498 err_out:
 499         ipu_put_resources(ipu_crtc);
 500
 501         return ret;
 502 }
 503
 504 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 505                 struct ipu_client_platformdata *pdata)
 506 {
 507         int ret;
 508
 509         ret = ipu_get_resources(ipu_crtc, pdata);
 510         if (ret) {
 511                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 512                                 ret);
 513                 return ret;
 514         }
 515
 516         ret = imx_drm_add_crtc(&ipu_crtc->base,
 517                         &ipu_crtc->imx_crtc,
 518                         &ipu_crtc_helper_funcs, THIS_MODULE,
 519                         ipu_crtc->dev->parent->of_node, pdata->di);
 520         if (ret) {
 521                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 522                 goto err_put_resources;
 523         }
 524
 525         return 0;
 526
 527 err_put_resources:
 528         ipu_put_resources(ipu_crtc);
 529
 530         return ret;
 531 }
 532
 533 static int ipu_drm_probe(struct platform_device *pdev)
 534 {
 535         struct ipu_client_platformdata *pdata = pdev->dev.platform_data;
 536         struct ipu_crtc *ipu_crtc;
 537         int ret;
 538
 539         if (!pdata)
 540                 return -EINVAL;
 541
 542         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 543
 544         ipu_crtc = devm_kzalloc(&pdev->dev, sizeof(*ipu_crtc), GFP_KERNEL);
 545         if (!ipu_crtc)
 546                 return -ENOMEM;
 547
 548         ipu_crtc->dev = &pdev->dev;
 549
 550         ret = ipu_crtc_init(ipu_crtc, pdata);
 551         if (ret)
 552                 return ret;
 553
 554         platform_set_drvdata(pdev, ipu_crtc);
 555
 556         return 0;
 557 }
 558
 559 static int ipu_drm_remove(struct platform_device *pdev)
 560 {
 561         struct ipu_crtc *ipu_crtc = platform_get_drvdata(pdev);
 562
 563         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 564
 565         ipu_put_resources(ipu_crtc);
 566
 567         return 0;
 568 }
 569
 570 static struct platform_driver ipu_drm_driver = {
 571         .driver = {
 572                 .name = "imx-ipuv3-crtc",
 573         },
 574         .probe = ipu_drm_probe,
 575         .remove = ipu_drm_remove,
 576 };
 577 module_platform_driver(ipu_drm_driver);
 578
 579 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 580 MODULE_DESCRIPTION(DRIVER_DESC);
 581 MODULE_LICENSE("GPL");