drivers/gpu/drm/gma500/framebuffer.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /**************************************************************************
   3  * Copyright (c) 2007-2011, Intel Corporation.
   4  * All Rights Reserved.
   5  *
   6  **************************************************************************/
   7
   8 #include <linux/console.h>
   9 #include <linux/delay.h>
  10 #include <linux/errno.h>
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/mm.h>
  14 #include <linux/module.h>
  15 #include <linux/pfn_t.h>
  16 #include <linux/slab.h>
  17 #include <linux/string.h>
  18 #include <linux/tty.h>
  19
  20 #include <drm/drm.h>
  21 #include <drm/drm_crtc.h>
  22 #include <drm/drm_fb_helper.h>
  23 #include <drm/drm_fourcc.h>
  24 #include <drm/drm_gem_framebuffer_helper.h>
  25
  26 #include "framebuffer.h"
  27 #include "gem.h"
  28 #include "gtt.h"
  29 #include "psb_drv.h"
  30 #include "psb_intel_drv.h"
  31 #include "psb_intel_reg.h"
  32
  33 static const struct drm_framebuffer_funcs psb_fb_funcs = {
  34         .destroy = drm_gem_fb_destroy,
  35         .create_handle = drm_gem_fb_create_handle,
  36 };
  37
  38 #define CMAP_TOHW(_val, _width) ((((_val) << (_width)) + 0x7FFF - (_val)) >> 16)
  39
  40 static int psbfb_setcolreg(unsigned regno, unsigned red, unsigned green,
  41                            unsigned blue, unsigned transp,
  42                            struct fb_info *info)
  43 {
  44         struct drm_fb_helper *fb_helper = info->par;
  45         struct drm_framebuffer *fb = fb_helper->fb;
  46         uint32_t v;
  47
  48         if (!fb)
  49                 return -ENOMEM;
  50
  51         if (regno > 255)
  52                 return 1;
  53
  54         red = CMAP_TOHW(red, info->var.red.length);
  55         blue = CMAP_TOHW(blue, info->var.blue.length);
  56         green = CMAP_TOHW(green, info->var.green.length);
  57         transp = CMAP_TOHW(transp, info->var.transp.length);
  58
  59         v = (red << info->var.red.offset) |
  60             (green << info->var.green.offset) |
  61             (blue << info->var.blue.offset) |
  62             (transp << info->var.transp.offset);
  63
  64         if (regno < 16) {
  65                 switch (fb->format->cpp[0] * 8) {
  66                 case 16:
  67                         ((uint32_t *) info->pseudo_palette)[regno] = v;
  68                         break;
  69                 case 24:
  70                 case 32:
  71                         ((uint32_t *) info->pseudo_palette)[regno] = v;
  72                         break;
  73                 }
  74         }
  75
  76         return 0;
  77 }
  78
  79 static vm_fault_t psbfb_vm_fault(struct vm_fault *vmf)
  80 {
  81         struct vm_area_struct *vma = vmf->vma;
  82         struct drm_framebuffer *fb = vma->vm_private_data;
  83         struct drm_device *dev = fb->dev;
  84         struct drm_psb_private *dev_priv = dev->dev_private;
  85         struct gtt_range *gtt = to_gtt_range(fb->obj[0]);
  86         int page_num;
  87         int i;
  88         unsigned long address;
  89         vm_fault_t ret = VM_FAULT_SIGBUS;
  90         unsigned long pfn;
  91         unsigned long phys_addr = (unsigned long)dev_priv->stolen_base +
  92                                   gtt->offset;
  93
  94         page_num = vma_pages(vma);
  95         address = vmf->address - (vmf->pgoff << PAGE_SHIFT);
  96
  97         vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
  98
  99         for (i = 0; i < page_num; i++) {
 100                 pfn = (phys_addr >> PAGE_SHIFT);
 101
 102                 ret = vmf_insert_mixed(vma, address,
 103                                 __pfn_to_pfn_t(pfn, PFN_DEV));
 104                 if (unlikely(ret & VM_FAULT_ERROR))
 105                         break;
 106                 address += PAGE_SIZE;
 107                 phys_addr += PAGE_SIZE;
 108         }
 109         return ret;
 110 }
 111
 112 static void psbfb_vm_open(struct vm_area_struct *vma)
 113 {
 114 }
 115
 116 static void psbfb_vm_close(struct vm_area_struct *vma)
 117 {
 118 }
 119
 120 static const struct vm_operations_struct psbfb_vm_ops = {
 121         .fault  = psbfb_vm_fault,
 122         .open   = psbfb_vm_open,
 123         .close  = psbfb_vm_close
 124 };
 125
 126 static int psbfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
 127 {
 128         struct drm_fb_helper *fb_helper = info->par;
 129         struct drm_framebuffer *fb = fb_helper->fb;
 130
 131         if (vma->vm_pgoff != 0)
 132                 return -EINVAL;
 133         if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
 134                 return -EINVAL;
 135
 136         /*
 137          * If this is a GEM object then info->screen_base is the virtual
 138          * kernel remapping of the object. FIXME: Review if this is
 139          * suitable for our mmap work
 140          */
 141         vma->vm_ops = &psbfb_vm_ops;
 142         vma->vm_private_data = (void *)fb;
 143         vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
 144         return 0;
 145 }
 146
 147 static const struct fb_ops psbfb_unaccel_ops = {
 148         .owner = THIS_MODULE,
 149         DRM_FB_HELPER_DEFAULT_OPS,
 150         .fb_setcolreg = psbfb_setcolreg,
 151         .fb_fillrect = drm_fb_helper_cfb_fillrect,
 152         .fb_copyarea = drm_fb_helper_cfb_copyarea,
 153         .fb_imageblit = drm_fb_helper_cfb_imageblit,
 154         .fb_mmap = psbfb_mmap,
 155 };
 156
 157 /**
 158  *      psb_framebuffer_init    -       initialize a framebuffer
 159  *      @dev: our DRM device
 160  *      @fb: framebuffer to set up
 161  *      @mode_cmd: mode description
 162  *      @gt: backing object
 163  *
 164  *      Configure and fill in the boilerplate for our frame buffer. Return
 165  *      0 on success or an error code if we fail.
 166  */
 167 static int psb_framebuffer_init(struct drm_device *dev,
 168                                         struct drm_framebuffer *fb,
 169                                         const struct drm_mode_fb_cmd2 *mode_cmd,
 170                                         struct drm_gem_object *obj)
 171 {
 172         const struct drm_format_info *info;
 173         int ret;
 174
 175         /*
 176          * Reject unknown formats, YUV formats, and formats with more than
 177          * 4 bytes per pixel.
 178          */
 179         info = drm_get_format_info(dev, mode_cmd);
 180         if (!info || !info->depth || info->cpp[0] > 4)
 181                 return -EINVAL;
 182
 183         if (mode_cmd->pitches[0] & 63)
 184                 return -EINVAL;
 185
 186         drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd);
 187         fb->obj[0] = obj;
 188         ret = drm_framebuffer_init(dev, fb, &psb_fb_funcs);
 189         if (ret) {
 190                 dev_err(dev->dev, "framebuffer init failed: %d\n", ret);
 191                 return ret;
 192         }
 193         return 0;
 194 }
 195
 196 /**
 197  *      psb_framebuffer_create  -       create a framebuffer backed by gt
 198  *      @dev: our DRM device
 199  *      @mode_cmd: the description of the requested mode
 200  *      @gt: the backing object
 201  *
 202  *      Create a framebuffer object backed by the gt, and fill in the
 203  *      boilerplate required
 204  *
 205  *      TODO: review object references
 206  */
 207
 208 static struct drm_framebuffer *psb_framebuffer_create
 209                         (struct drm_device *dev,
 210                          const struct drm_mode_fb_cmd2 *mode_cmd,
 211                          struct drm_gem_object *obj)
 212 {
 213         struct drm_framebuffer *fb;
 214         int ret;
 215
 216         fb = kzalloc(sizeof(*fb), GFP_KERNEL);
 217         if (!fb)
 218                 return ERR_PTR(-ENOMEM);
 219
 220         ret = psb_framebuffer_init(dev, fb, mode_cmd, obj);
 221         if (ret) {
 222                 kfree(fb);
 223                 return ERR_PTR(ret);
 224         }
 225         return fb;
 226 }
 227
 228 /**
 229  *      psbfb_alloc             -       allocate frame buffer memory
 230  *      @dev: the DRM device
 231  *      @aligned_size: space needed
 232  *
 233  *      Allocate the frame buffer. In the usual case we get a GTT range that
 234  *      is stolen memory backed and life is simple. If there isn't sufficient
 235  *      we fail as we don't have the virtual mapping space to really vmap it
 236  *      and the kernel console code can't handle non linear framebuffers.
 237  *
 238  *      Re-address this as and if the framebuffer layer grows this ability.
 239  */
 240 static struct gtt_range *psbfb_alloc(struct drm_device *dev, int aligned_size)
 241 {
 242         struct gtt_range *backing;
 243         /* Begin by trying to use stolen memory backing */
 244         backing = psb_gtt_alloc_range(dev, aligned_size, "fb", 1, PAGE_SIZE);
 245         if (backing) {
 246                 backing->gem.funcs = &psb_gem_object_funcs;
 247                 drm_gem_private_object_init(dev, &backing->gem, aligned_size);
 248                 return backing;
 249         }
 250         return NULL;
 251 }
 252
 253 /**
 254  *      psbfb_create            -       create a framebuffer
 255  *      @fbdev: the framebuffer device
 256  *      @sizes: specification of the layout
 257  *
 258  *      Create a framebuffer to the specifications provided
 259  */
 260 static int psbfb_create(struct drm_fb_helper *fb_helper,
 261                                 struct drm_fb_helper_surface_size *sizes)
 262 {
 263         struct drm_device *dev = fb_helper->dev;
 264         struct drm_psb_private *dev_priv = dev->dev_private;
 265         struct fb_info *info;
 266         struct drm_framebuffer *fb;
 267         struct drm_mode_fb_cmd2 mode_cmd;
 268         int size;
 269         int ret;
 270         struct gtt_range *backing;
 271         u32 bpp, depth;
 272
 273         mode_cmd.width = sizes->surface_width;
 274         mode_cmd.height = sizes->surface_height;
 275         bpp = sizes->surface_bpp;
 276         depth = sizes->surface_depth;
 277
 278         /* No 24bit packed */
 279         if (bpp == 24)
 280                 bpp = 32;
 281
 282         mode_cmd.pitches[0] = ALIGN(mode_cmd.width * DIV_ROUND_UP(bpp, 8), 64);
 283
 284         size = mode_cmd.pitches[0] * mode_cmd.height;
 285         size = ALIGN(size, PAGE_SIZE);
 286
 287         /* Allocate the framebuffer in the GTT with stolen page backing */
 288         backing = psbfb_alloc(dev, size);
 289         if (backing == NULL)
 290                 return -ENOMEM;
 291
 292         memset(dev_priv->vram_addr + backing->offset, 0, size);
 293
 294         info = drm_fb_helper_alloc_fbi(fb_helper);
 295         if (IS_ERR(info)) {
 296                 ret = PTR_ERR(info);
 297                 goto out;
 298         }
 299
 300         mode_cmd.pixel_format = drm_mode_legacy_fb_format(bpp, depth);
 301
 302         fb = psb_framebuffer_create(dev, &mode_cmd, &backing->gem);
 303         if (IS_ERR(fb)) {
 304                 ret = PTR_ERR(fb);
 305                 goto out;
 306         }
 307
 308         fb_helper->fb = fb;
 309
 310         info->fbops = &psbfb_unaccel_ops;
 311
 312         info->fix.smem_start = dev->mode_config.fb_base;
 313         info->fix.smem_len = size;
 314         info->fix.ywrapstep = 0;
 315         info->fix.ypanstep = 0;
 316
 317         /* Accessed stolen memory directly */
 318         info->screen_base = dev_priv->vram_addr + backing->offset;
 319         info->screen_size = size;
 320
 321         if (dev_priv->gtt.stolen_size) {
 322                 info->apertures->ranges[0].base = dev->mode_config.fb_base;
 323                 info->apertures->ranges[0].size = dev_priv->gtt.stolen_size;
 324         }
 325
 326         drm_fb_helper_fill_info(info, fb_helper, sizes);
 327
 328         info->fix.mmio_start = pci_resource_start(dev->pdev, 0);
 329         info->fix.mmio_len = pci_resource_len(dev->pdev, 0);
 330
 331         /* Use default scratch pixmap (info->pixmap.flags = FB_PIXMAP_SYSTEM) */
 332
 333         dev_dbg(dev->dev, "allocated %dx%d fb\n", fb->width, fb->height);
 334
 335         return 0;
 336 out:
 337         psb_gtt_free_range(dev, backing);
 338         return ret;
 339 }
 340
 341 /**
 342  *      psb_user_framebuffer_create     -       create framebuffer
 343  *      @dev: our DRM device
 344  *      @filp: client file
 345  *      @cmd: mode request
 346  *
 347  *      Create a new framebuffer backed by a userspace GEM object
 348  */
 349 static struct drm_framebuffer *psb_user_framebuffer_create
 350                         (struct drm_device *dev, struct drm_file *filp,
 351                          const struct drm_mode_fb_cmd2 *cmd)
 352 {
 353         struct drm_gem_object *obj;
 354
 355         /*
 356          *      Find the GEM object and thus the gtt range object that is
 357          *      to back this space
 358          */
 359         obj = drm_gem_object_lookup(filp, cmd->handles[0]);
 360         if (obj == NULL)
 361                 return ERR_PTR(-ENOENT);
 362
 363         /* Let the core code do all the work */
 364         return psb_framebuffer_create(dev, cmd, obj);
 365 }
 366
 367 static int psbfb_probe(struct drm_fb_helper *fb_helper,
 368                                 struct drm_fb_helper_surface_size *sizes)
 369 {
 370         struct drm_device *dev = fb_helper->dev;
 371         struct drm_psb_private *dev_priv = dev->dev_private;
 372         unsigned int fb_size;
 373         int bytespp;
 374
 375         bytespp = sizes->surface_bpp / 8;
 376         if (bytespp == 3)       /* no 24bit packed */
 377                 bytespp = 4;
 378
 379         /* If the mode will not fit in 32bit then switch to 16bit to get
 380            a console on full resolution. The X mode setting server will
 381            allocate its own 32bit GEM framebuffer */
 382         fb_size = ALIGN(sizes->surface_width * bytespp, 64) *
 383                   sizes->surface_height;
 384         fb_size = ALIGN(fb_size, PAGE_SIZE);
 385
 386         if (fb_size > dev_priv->vram_stolen_size) {
 387                 sizes->surface_bpp = 16;
 388                 sizes->surface_depth = 16;
 389         }
 390
 391         return psbfb_create(fb_helper, sizes);
 392 }
 393
 394 static const struct drm_fb_helper_funcs psb_fb_helper_funcs = {
 395         .fb_probe = psbfb_probe,
 396 };
 397
 398 static int psb_fbdev_destroy(struct drm_device *dev,
 399                              struct drm_fb_helper *fb_helper)
 400 {
 401         struct drm_framebuffer *fb = fb_helper->fb;
 402
 403         drm_fb_helper_unregister_fbi(fb_helper);
 404
 405         drm_fb_helper_fini(fb_helper);
 406         drm_framebuffer_unregister_private(fb);
 407         drm_framebuffer_cleanup(fb);
 408
 409         if (fb->obj[0])
 410                 drm_gem_object_put(fb->obj[0]);
 411         kfree(fb);
 412
 413         return 0;
 414 }
 415
 416 int psb_fbdev_init(struct drm_device *dev)
 417 {
 418         struct drm_fb_helper *fb_helper;
 419         struct drm_psb_private *dev_priv = dev->dev_private;
 420         int ret;
 421
 422         fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
 423         if (!fb_helper) {
 424                 dev_err(dev->dev, "no memory\n");
 425                 return -ENOMEM;
 426         }
 427
 428         dev_priv->fb_helper = fb_helper;
 429
 430         drm_fb_helper_prepare(dev, fb_helper, &psb_fb_helper_funcs);
 431
 432         ret = drm_fb_helper_init(dev, fb_helper);
 433         if (ret)
 434                 goto free;
 435
 436         /* disable all the possible outputs/crtcs before entering KMS mode */
 437         drm_helper_disable_unused_functions(dev);
 438
 439         ret = drm_fb_helper_initial_config(fb_helper, 32);
 440         if (ret)
 441                 goto fini;
 442
 443         return 0;
 444
 445 fini:
 446         drm_fb_helper_fini(fb_helper);
 447 free:
 448         kfree(fb_helper);
 449         return ret;
 450 }
 451
 452 static void psb_fbdev_fini(struct drm_device *dev)
 453 {
 454         struct drm_psb_private *dev_priv = dev->dev_private;
 455
 456         if (!dev_priv->fb_helper)
 457                 return;
 458
 459         psb_fbdev_destroy(dev, dev_priv->fb_helper);
 460         kfree(dev_priv->fb_helper);
 461         dev_priv->fb_helper = NULL;
 462 }
 463
 464 static const struct drm_mode_config_funcs psb_mode_funcs = {
 465         .fb_create = psb_user_framebuffer_create,
 466         .output_poll_changed = drm_fb_helper_output_poll_changed,
 467 };
 468
 469 static void psb_setup_outputs(struct drm_device *dev)
 470 {
 471         struct drm_psb_private *dev_priv = dev->dev_private;
 472         struct drm_connector *connector;
 473
 474         drm_mode_create_scaling_mode_property(dev);
 475
 476         /* It is ok for this to fail - we just don't get backlight control */
 477         if (!dev_priv->backlight_property)
 478                 dev_priv->backlight_property = drm_property_create_range(dev, 0,
 479                                                         "backlight", 0, 100);
 480         dev_priv->ops->output_init(dev);
 481
 482         list_for_each_entry(connector, &dev->mode_config.connector_list,
 483                             head) {
 484                 struct gma_encoder *gma_encoder = gma_attached_encoder(connector);
 485                 struct drm_encoder *encoder = &gma_encoder->base;
 486                 int crtc_mask = 0, clone_mask = 0;
 487
 488                 /* valid crtcs */
 489                 switch (gma_encoder->type) {
 490                 case INTEL_OUTPUT_ANALOG:
 491                         crtc_mask = (1 << 0);
 492                         clone_mask = (1 << INTEL_OUTPUT_ANALOG);
 493                         break;
 494                 case INTEL_OUTPUT_SDVO:
 495                         crtc_mask = dev_priv->ops->sdvo_mask;
 496                         clone_mask = 0;
 497                         break;
 498                 case INTEL_OUTPUT_LVDS:
 499                         crtc_mask = dev_priv->ops->lvds_mask;
 500                         clone_mask = 0;
 501                         break;
 502                 case INTEL_OUTPUT_MIPI:
 503                         crtc_mask = (1 << 0);
 504                         clone_mask = 0;
 505                         break;
 506                 case INTEL_OUTPUT_MIPI2:
 507                         crtc_mask = (1 << 2);
 508                         clone_mask = 0;
 509                         break;
 510                 case INTEL_OUTPUT_HDMI:
 511                         crtc_mask = dev_priv->ops->hdmi_mask;
 512                         clone_mask = (1 << INTEL_OUTPUT_HDMI);
 513                         break;
 514                 case INTEL_OUTPUT_DISPLAYPORT:
 515                         crtc_mask = (1 << 0) | (1 << 1);
 516                         clone_mask = 0;
 517                         break;
 518                 case INTEL_OUTPUT_EDP:
 519                         crtc_mask = (1 << 1);
 520                         clone_mask = 0;
 521                 }
 522                 encoder->possible_crtcs = crtc_mask;
 523                 encoder->possible_clones =
 524                     gma_connector_clones(dev, clone_mask);
 525         }
 526 }
 527
 528 void psb_modeset_init(struct drm_device *dev)
 529 {
 530         struct drm_psb_private *dev_priv = dev->dev_private;
 531         struct psb_intel_mode_device *mode_dev = &dev_priv->mode_dev;
 532         int i;
 533
 534         drm_mode_config_init(dev);
 535
 536         dev->mode_config.min_width = 0;
 537         dev->mode_config.min_height = 0;
 538
 539         dev->mode_config.funcs = &psb_mode_funcs;
 540
 541         /* set memory base */
 542         /* Oaktrail and Poulsbo should use BAR 2*/
 543         pci_read_config_dword(dev->pdev, PSB_BSM, (u32 *)
 544                                         &(dev->mode_config.fb_base));
 545
 546         /* num pipes is 2 for PSB but 1 for Mrst */
 547         for (i = 0; i < dev_priv->num_pipe; i++)
 548                 psb_intel_crtc_init(dev, i, mode_dev);
 549
 550         dev->mode_config.max_width = 4096;
 551         dev->mode_config.max_height = 4096;
 552
 553         psb_setup_outputs(dev);
 554
 555         if (dev_priv->ops->errata)
 556                 dev_priv->ops->errata(dev);
 557
 558         dev_priv->modeset = true;
 559 }
 560
 561 void psb_modeset_cleanup(struct drm_device *dev)
 562 {
 563         struct drm_psb_private *dev_priv = dev->dev_private;
 564         if (dev_priv->modeset) {
 565                 drm_kms_helper_poll_fini(dev);
 566                 psb_fbdev_fini(dev);
 567                 drm_mode_config_cleanup(dev);
 568         }
 569 }