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         int                     di_hsync_pin;
  64         int                     di_vsync_pin;
  65 };
  66
  67 #define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)
  68
  69 static int calc_vref(struct drm_display_mode *mode)
  70 {
  71         unsigned long htotal, vtotal;
  72
  73         htotal = mode->htotal;
  74         vtotal = mode->vtotal;
  75
  76         if (!htotal || !vtotal)
  77                 return 60;
  78
  79         return mode->clock * 1000 / vtotal / htotal;
  80 }
  81
  82 static int calc_bandwidth(struct drm_display_mode *mode, unsigned int vref)
  83 {
  84         return mode->hdisplay * mode->vdisplay * vref;
  85 }
  86
  87 static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
  88 {
  89         if (ipu_crtc->enabled)
  90                 return;
  91
  92         ipu_di_enable(ipu_crtc->di);
  93         ipu_dmfc_enable_channel(ipu_crtc->dmfc);
  94         ipu_idmac_enable_channel(ipu_crtc->ipu_ch);
  95         ipu_dc_enable_channel(ipu_crtc->dc);
  96         if (ipu_crtc->dp)
  97                 ipu_dp_enable_channel(ipu_crtc->dp);
  98
  99         ipu_crtc->enabled = 1;
 100 }
 101
 102 static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
 103 {
 104         if (!ipu_crtc->enabled)
 105                 return;
 106
 107         if (ipu_crtc->dp)
 108                 ipu_dp_disable_channel(ipu_crtc->dp);
 109         ipu_dc_disable_channel(ipu_crtc->dc);
 110         ipu_idmac_disable_channel(ipu_crtc->ipu_ch);
 111         ipu_dmfc_disable_channel(ipu_crtc->dmfc);
 112         ipu_di_disable(ipu_crtc->di);
 113
 114         ipu_crtc->enabled = 0;
 115 }
 116
 117 static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
 118 {
 119         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 120
 121         dev_dbg(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);
 122
 123         switch (mode) {
 124         case DRM_MODE_DPMS_ON:
 125                 ipu_fb_enable(ipu_crtc);
 126                 break;
 127         case DRM_MODE_DPMS_STANDBY:
 128         case DRM_MODE_DPMS_SUSPEND:
 129         case DRM_MODE_DPMS_OFF:
 130                 ipu_fb_disable(ipu_crtc);
 131                 break;
 132         }
 133 }
 134
 135 static int ipu_page_flip(struct drm_crtc *crtc,
 136                 struct drm_framebuffer *fb,
 137                 struct drm_pending_vblank_event *event)
 138 {
 139         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 140         int ret;
 141
 142         if (ipu_crtc->newfb)
 143                 return -EBUSY;
 144
 145         ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
 146         if (ret) {
 147                 dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
 148                 list_del(&event->base.link);
 149
 150                 return ret;
 151         }
 152
 153         ipu_crtc->newfb = fb;
 154         ipu_crtc->page_flip_event = event;
 155
 156         return 0;
 157 }
 158
 159 static const struct drm_crtc_funcs ipu_crtc_funcs = {
 160         .set_config = drm_crtc_helper_set_config,
 161         .destroy = drm_crtc_cleanup,
 162         .page_flip = ipu_page_flip,
 163 };
 164
 165 static int ipu_drm_set_base(struct drm_crtc *crtc, int x, int y)
 166 {
 167         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 168         struct drm_gem_cma_object *cma_obj;
 169         struct drm_framebuffer *fb = crtc->fb;
 170         unsigned long phys;
 171
 172         cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
 173         if (!cma_obj) {
 174                 DRM_LOG_KMS("entry is null.\n");
 175                 return -EFAULT;
 176         }
 177
 178         phys = cma_obj->paddr;
 179         phys += x * (fb->bits_per_pixel >> 3);
 180         phys += y * fb->pitches[0];
 181
 182         dev_dbg(ipu_crtc->dev, "%s: phys: 0x%lx\n", __func__, phys);
 183         dev_dbg(ipu_crtc->dev, "%s: xy: %dx%d\n", __func__, x, y);
 184
 185         ipu_cpmem_set_stride(ipu_get_cpmem(ipu_crtc->ipu_ch), fb->pitches[0]);
 186         ipu_cpmem_set_buffer(ipu_get_cpmem(ipu_crtc->ipu_ch),
 187                           0, phys);
 188
 189         return 0;
 190 }
 191
 192 static int ipu_crtc_mode_set(struct drm_crtc *crtc,
 193                                struct drm_display_mode *orig_mode,
 194                                struct drm_display_mode *mode,
 195                                int x, int y,
 196                                struct drm_framebuffer *old_fb)
 197 {
 198         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 199         struct drm_framebuffer *fb = ipu_crtc->base.fb;
 200         int ret;
 201         struct ipu_di_signal_cfg sig_cfg = {};
 202         u32 out_pixel_fmt;
 203         struct ipu_ch_param __iomem *cpmem = ipu_get_cpmem(ipu_crtc->ipu_ch);
 204         int bpp;
 205         u32 v4l2_fmt;
 206
 207         dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
 208                         mode->hdisplay);
 209         dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
 210                         mode->vdisplay);
 211
 212         ipu_ch_param_zero(cpmem);
 213
 214         switch (fb->pixel_format) {
 215         case DRM_FORMAT_XRGB8888:
 216         case DRM_FORMAT_ARGB8888:
 217                 v4l2_fmt = V4L2_PIX_FMT_RGB32;
 218                 bpp = 32;
 219                 break;
 220         case DRM_FORMAT_RGB565:
 221                 v4l2_fmt = V4L2_PIX_FMT_RGB565;
 222                 bpp = 16;
 223                 break;
 224         case DRM_FORMAT_RGB888:
 225                 v4l2_fmt = V4L2_PIX_FMT_RGB24;
 226                 bpp = 24;
 227                 break;
 228         default:
 229                 dev_err(ipu_crtc->dev, "unsupported pixel format 0x%08x\n",
 230                                 fb->pixel_format);
 231                 return -EINVAL;
 232         }
 233
 234         out_pixel_fmt = ipu_crtc->interface_pix_fmt;
 235
 236         if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 237                 sig_cfg.interlaced = 1;
 238         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 239                 sig_cfg.Hsync_pol = 1;
 240         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 241                 sig_cfg.Vsync_pol = 1;
 242
 243         sig_cfg.enable_pol = 1;
 244         sig_cfg.clk_pol = 0;
 245         sig_cfg.width = mode->hdisplay;
 246         sig_cfg.height = mode->vdisplay;
 247         sig_cfg.pixel_fmt = out_pixel_fmt;
 248         sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
 249         sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
 250         sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;
 251
 252         sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
 253         sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
 254         sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
 255         sig_cfg.pixelclock = mode->clock * 1000;
 256         sig_cfg.clkflags = ipu_crtc->di_clkflags;
 257
 258         sig_cfg.v_to_h_sync = 0;
 259
 260         sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 261         sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;
 262
 263         if (ipu_crtc->dp) {
 264                 ret = ipu_dp_setup_channel(ipu_crtc->dp, IPUV3_COLORSPACE_RGB,
 265                                 IPUV3_COLORSPACE_RGB);
 266                 if (ret) {
 267                         dev_err(ipu_crtc->dev,
 268                                 "initializing display processor failed with %d\n",
 269                                 ret);
 270                         return ret;
 271                 }
 272                 ipu_dp_set_global_alpha(ipu_crtc->dp, 1, 0, 1);
 273         }
 274
 275         ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
 276                         out_pixel_fmt, mode->hdisplay);
 277         if (ret) {
 278                 dev_err(ipu_crtc->dev,
 279                                 "initializing display controller failed with %d\n",
 280                                 ret);
 281                 return ret;
 282         }
 283
 284         ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
 285         if (ret) {
 286                 dev_err(ipu_crtc->dev,
 287                                 "initializing panel failed with %d\n", ret);
 288                 return ret;
 289         }
 290
 291         ipu_cpmem_set_resolution(cpmem, mode->hdisplay, mode->vdisplay);
 292         ipu_cpmem_set_fmt(cpmem, v4l2_fmt);
 293         ipu_cpmem_set_high_priority(ipu_crtc->ipu_ch);
 294
 295         ret = ipu_dmfc_init_channel(ipu_crtc->dmfc, mode->hdisplay);
 296         if (ret) {
 297                 dev_err(ipu_crtc->dev,
 298                                 "initializing dmfc channel failed with %d\n",
 299                                 ret);
 300                 return ret;
 301         }
 302
 303         ret = ipu_dmfc_alloc_bandwidth(ipu_crtc->dmfc,
 304                         calc_bandwidth(mode, calc_vref(mode)), 64);
 305         if (ret) {
 306                 dev_err(ipu_crtc->dev,
 307                                 "allocating dmfc bandwidth failed with %d\n",
 308                                 ret);
 309                 return ret;
 310         }
 311
 312         ipu_drm_set_base(crtc, x, y);
 313
 314         return 0;
 315 }
 316
 317 static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
 318 {
 319         struct drm_pending_vblank_event *e;
 320         struct timeval now;
 321         unsigned long flags;
 322         struct drm_device *drm = ipu_crtc->base.dev;
 323
 324         spin_lock_irqsave(&drm->event_lock, flags);
 325
 326         e = ipu_crtc->page_flip_event;
 327         if (!e) {
 328                 spin_unlock_irqrestore(&drm->event_lock, flags);
 329                 return;
 330         }
 331
 332         do_gettimeofday(&now);
 333         e->event.sequence = 0;
 334         e->event.tv_sec = now.tv_sec;
 335         e->event.tv_usec = now.tv_usec;
 336         ipu_crtc->page_flip_event = NULL;
 337
 338         imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
 339
 340         list_add_tail(&e->base.link, &e->base.file_priv->event_list);
 341
 342         wake_up_interruptible(&e->base.file_priv->event_wait);
 343
 344         spin_unlock_irqrestore(&drm->event_lock, flags);
 345 }
 346
 347 static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
 348 {
 349         struct ipu_crtc *ipu_crtc = dev_id;
 350
 351         imx_drm_handle_vblank(ipu_crtc->imx_crtc);
 352
 353         if (ipu_crtc->newfb) {
 354                 ipu_crtc->base.fb = ipu_crtc->newfb;
 355                 ipu_crtc->newfb = NULL;
 356                 ipu_drm_set_base(&ipu_crtc->base, 0, 0);
 357                 ipu_crtc_handle_pageflip(ipu_crtc);
 358         }
 359
 360         return IRQ_HANDLED;
 361 }
 362
 363 static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
 364                                   const struct drm_display_mode *mode,
 365                                   struct drm_display_mode *adjusted_mode)
 366 {
 367         return true;
 368 }
 369
 370 static void ipu_crtc_prepare(struct drm_crtc *crtc)
 371 {
 372         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 373
 374         ipu_fb_disable(ipu_crtc);
 375 }
 376
 377 static void ipu_crtc_commit(struct drm_crtc *crtc)
 378 {
 379         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 380
 381         ipu_fb_enable(ipu_crtc);
 382 }
 383
 384 static void ipu_crtc_load_lut(struct drm_crtc *crtc)
 385 {
 386 }
 387
 388 static struct drm_crtc_helper_funcs ipu_helper_funcs = {
 389         .dpms = ipu_crtc_dpms,
 390         .mode_fixup = ipu_crtc_mode_fixup,
 391         .mode_set = ipu_crtc_mode_set,
 392         .prepare = ipu_crtc_prepare,
 393         .commit = ipu_crtc_commit,
 394         .load_lut = ipu_crtc_load_lut,
 395 };
 396
 397 static int ipu_enable_vblank(struct drm_crtc *crtc)
 398 {
 399         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 400
 401         enable_irq(ipu_crtc->irq);
 402
 403         return 0;
 404 }
 405
 406 static void ipu_disable_vblank(struct drm_crtc *crtc)
 407 {
 408         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 409
 410         disable_irq(ipu_crtc->irq);
 411 }
 412
 413 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
 414                 u32 pixfmt, int hsync_pin, int vsync_pin)
 415 {
 416         struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 417
 418         ipu_crtc->interface_pix_fmt = pixfmt;
 419         ipu_crtc->di_hsync_pin = hsync_pin;
 420         ipu_crtc->di_vsync_pin = vsync_pin;
 421
 422         switch (encoder_type) {
 423         case DRM_MODE_ENCODER_DAC:
 424         case DRM_MODE_ENCODER_TVDAC:
 425         case DRM_MODE_ENCODER_LVDS:
 426                 ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
 427                         IPU_DI_CLKMODE_EXT;
 428                 break;
 429         case DRM_MODE_ENCODER_NONE:
 430                 ipu_crtc->di_clkflags = 0;
 431                 break;
 432         }
 433
 434         return 0;
 435 }
 436
 437 static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
 438         .enable_vblank = ipu_enable_vblank,
 439         .disable_vblank = ipu_disable_vblank,
 440         .set_interface_pix_fmt = ipu_set_interface_pix_fmt,
 441         .crtc_funcs = &ipu_crtc_funcs,
 442         .crtc_helper_funcs = &ipu_helper_funcs,
 443 };
 444
 445 static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
 446 {
 447         if (!IS_ERR_OR_NULL(ipu_crtc->ipu_ch))
 448                 ipu_idmac_put(ipu_crtc->ipu_ch);
 449         if (!IS_ERR_OR_NULL(ipu_crtc->dmfc))
 450                 ipu_dmfc_put(ipu_crtc->dmfc);
 451         if (!IS_ERR_OR_NULL(ipu_crtc->dp))
 452                 ipu_dp_put(ipu_crtc->dp);
 453         if (!IS_ERR_OR_NULL(ipu_crtc->di))
 454                 ipu_di_put(ipu_crtc->di);
 455 }
 456
 457 static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
 458                 struct ipu_client_platformdata *pdata)
 459 {
 460         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 461         int ret;
 462
 463         ipu_crtc->ipu_ch = ipu_idmac_get(ipu, pdata->dma[0]);
 464         if (IS_ERR(ipu_crtc->ipu_ch)) {
 465                 ret = PTR_ERR(ipu_crtc->ipu_ch);
 466                 goto err_out;
 467         }
 468
 469         ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
 470         if (IS_ERR(ipu_crtc->dc)) {
 471                 ret = PTR_ERR(ipu_crtc->dc);
 472                 goto err_out;
 473         }
 474
 475         ipu_crtc->dmfc = ipu_dmfc_get(ipu, pdata->dma[0]);
 476         if (IS_ERR(ipu_crtc->dmfc)) {
 477                 ret = PTR_ERR(ipu_crtc->dmfc);
 478                 goto err_out;
 479         }
 480
 481         if (pdata->dp >= 0) {
 482                 ipu_crtc->dp = ipu_dp_get(ipu, pdata->dp);
 483                 if (IS_ERR(ipu_crtc->dp)) {
 484                         ret = PTR_ERR(ipu_crtc->dp);
 485                         goto err_out;
 486                 }
 487         }
 488
 489         ipu_crtc->di = ipu_di_get(ipu, pdata->di);
 490         if (IS_ERR(ipu_crtc->di)) {
 491                 ret = PTR_ERR(ipu_crtc->di);
 492                 goto err_out;
 493         }
 494
 495         return 0;
 496 err_out:
 497         ipu_put_resources(ipu_crtc);
 498
 499         return ret;
 500 }
 501
 502 static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
 503                 struct ipu_client_platformdata *pdata)
 504 {
 505         struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
 506         int ret;
 507
 508         ret = ipu_get_resources(ipu_crtc, pdata);
 509         if (ret) {
 510                 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
 511                                 ret);
 512                 return ret;
 513         }
 514
 515         ret = imx_drm_add_crtc(&ipu_crtc->base,
 516                         &ipu_crtc->imx_crtc,
 517                         &ipu_crtc_helper_funcs, THIS_MODULE,
 518                         ipu_crtc->dev->parent->of_node, pdata->di);
 519         if (ret) {
 520                 dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
 521                 goto err_put_resources;
 522         }
 523
 524         ipu_crtc->irq = ipu_idmac_channel_irq(ipu, ipu_crtc->ipu_ch,
 525                         IPU_IRQ_EOF);
 526         ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
 527                         "imx_drm", ipu_crtc);
 528         if (ret < 0) {
 529                 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
 530                 goto err_put_resources;
 531         }
 532
 533         disable_irq(ipu_crtc->irq);
 534
 535         return 0;
 536
 537 err_put_resources:
 538         ipu_put_resources(ipu_crtc);
 539
 540         return ret;
 541 }
 542
 543 static int ipu_drm_probe(struct platform_device *pdev)
 544 {
 545         struct ipu_client_platformdata *pdata = pdev->dev.platform_data;
 546         struct ipu_crtc *ipu_crtc;
 547         int ret;
 548
 549         if (!pdata)
 550                 return -EINVAL;
 551
 552         pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
 553
 554         ipu_crtc = devm_kzalloc(&pdev->dev, sizeof(*ipu_crtc), GFP_KERNEL);
 555         if (!ipu_crtc)
 556                 return -ENOMEM;
 557
 558         ipu_crtc->dev = &pdev->dev;
 559
 560         ret = ipu_crtc_init(ipu_crtc, pdata);
 561         if (ret)
 562                 return ret;
 563
 564         platform_set_drvdata(pdev, ipu_crtc);
 565
 566         return 0;
 567 }
 568
 569 static int ipu_drm_remove(struct platform_device *pdev)
 570 {
 571         struct ipu_crtc *ipu_crtc = platform_get_drvdata(pdev);
 572
 573         imx_drm_remove_crtc(ipu_crtc->imx_crtc);
 574
 575         ipu_put_resources(ipu_crtc);
 576
 577         return 0;
 578 }
 579
 580 static struct platform_driver ipu_drm_driver = {
 581         .driver = {
 582                 .name = "imx-ipuv3-crtc",
 583         },
 584         .probe = ipu_drm_probe,
 585         .remove = ipu_drm_remove,
 586 };
 587 module_platform_driver(ipu_drm_driver);
 588
 589 MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
 590 MODULE_DESCRIPTION(DRIVER_DESC);
 591 MODULE_LICENSE("GPL");