drivers/gpu/drm/exynos/exynos_drm_fbdev.c

   1 /* exynos_drm_fbdev.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_crtc.h>
  17 #include <drm/drm_fb_helper.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/exynos_drm.h>
  20
  21 #include "exynos_drm_drv.h"
  22 #include "exynos_drm_fb.h"
  23 #include "exynos_drm_fbdev.h"
  24 #include "exynos_drm_gem.h"
  25 #include "exynos_drm_iommu.h"
  26
  27 #define MAX_CONNECTOR           4
  28 #define PREFERRED_BPP           32
  29
  30 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  31                                 drm_fb_helper)
  32
  33 struct exynos_drm_fbdev {
  34         struct drm_fb_helper            drm_fb_helper;
  35         struct exynos_drm_gem_obj       *exynos_gem_obj;
  36 };
  37
  38 static int exynos_drm_fb_mmap(struct fb_info *info,
  39                         struct vm_area_struct *vma)
  40 {
  41         struct drm_fb_helper *helper = info->par;
  42         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  43         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
  44         struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
  45         unsigned long vm_size;
  46         int ret;
  47
  48         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  49
  50         vm_size = vma->vm_end - vma->vm_start;
  51
  52         if (vm_size > buffer->size)
  53                 return -EINVAL;
  54
  55         ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
  56                 buffer->dma_addr, buffer->size, &buffer->dma_attrs);
  57         if (ret < 0) {
  58                 DRM_ERROR("failed to mmap.\n");
  59                 return ret;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static struct fb_ops exynos_drm_fb_ops = {
  66         .owner          = THIS_MODULE,
  67         .fb_mmap        = exynos_drm_fb_mmap,
  68         .fb_fillrect    = cfb_fillrect,
  69         .fb_copyarea    = cfb_copyarea,
  70         .fb_imageblit   = cfb_imageblit,
  71         .fb_check_var   = drm_fb_helper_check_var,
  72         .fb_set_par     = drm_fb_helper_set_par,
  73         .fb_blank       = drm_fb_helper_blank,
  74         .fb_pan_display = drm_fb_helper_pan_display,
  75         .fb_setcmap     = drm_fb_helper_setcmap,
  76 };
  77
  78 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  79                                      struct drm_framebuffer *fb)
  80 {
  81         struct fb_info *fbi = helper->fbdev;
  82         struct drm_device *dev = helper->dev;
  83         struct exynos_drm_gem_buf *buffer;
  84         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  85         unsigned long offset;
  86
  87         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  88         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  89
  90         /* RGB formats use only one buffer */
  91         buffer = exynos_drm_fb_buffer(fb, 0);
  92         if (!buffer) {
  93                 DRM_DEBUG_KMS("buffer is null.\n");
  94                 return -EFAULT;
  95         }
  96
  97         /* map pages with kernel virtual space. */
  98         if (!buffer->kvaddr) {
  99                 if (is_drm_iommu_supported(dev)) {
 100                         unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
 101
 102                         buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
 103                                         nr_pages, VM_MAP,
 104                                         pgprot_writecombine(PAGE_KERNEL));
 105                 } else {
 106                         phys_addr_t dma_addr = buffer->dma_addr;
 107                         if (dma_addr)
 108                                 buffer->kvaddr = (void __iomem *)phys_to_virt(dma_addr);
 109                         else
 110                                 buffer->kvaddr = (void __iomem *)NULL;
 111                 }
 112                 if (!buffer->kvaddr) {
 113                         DRM_ERROR("failed to map pages to kernel space.\n");
 114                         return -EIO;
 115                 }
 116         }
 117
 118         /* buffer count to framebuffer always is 1 at booting time. */
 119         exynos_drm_fb_set_buf_cnt(fb, 1);
 120
 121         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 122         offset += fbi->var.yoffset * fb->pitches[0];
 123
 124         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 125         fbi->screen_base = buffer->kvaddr + offset;
 126         fbi->screen_size = size;
 127
 128         return 0;
 129 }
 130
 131 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 132                                     struct drm_fb_helper_surface_size *sizes)
 133 {
 134         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 135         struct exynos_drm_gem_obj *exynos_gem_obj;
 136         struct drm_device *dev = helper->dev;
 137         struct fb_info *fbi;
 138         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 139         struct platform_device *pdev = dev->platformdev;
 140         unsigned long size;
 141         int ret;
 142
 143         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 144                         sizes->surface_width, sizes->surface_height,
 145                         sizes->surface_bpp);
 146
 147         mode_cmd.width = sizes->surface_width;
 148         mode_cmd.height = sizes->surface_height;
 149         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 150         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 151                                                           sizes->surface_depth);
 152
 153         mutex_lock(&dev->struct_mutex);
 154
 155         fbi = framebuffer_alloc(0, &pdev->dev);
 156         if (!fbi) {
 157                 DRM_ERROR("failed to allocate fb info.\n");
 158                 ret = -ENOMEM;
 159                 goto out;
 160         }
 161
 162         size = mode_cmd.pitches[0] * mode_cmd.height;
 163
 164         exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 165         /*
 166          * If physically contiguous memory allocation fails and if IOMMU is
 167          * supported then try to get buffer from non physically contiguous
 168          * memory area.
 169          */
 170         if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
 171                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 172                 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 173                                                         size);
 174         }
 175
 176         if (IS_ERR(exynos_gem_obj)) {
 177                 ret = PTR_ERR(exynos_gem_obj);
 178                 goto err_release_framebuffer;
 179         }
 180
 181         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 182
 183         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 184                         &exynos_gem_obj->base);
 185         if (IS_ERR(helper->fb)) {
 186                 DRM_ERROR("failed to create drm framebuffer.\n");
 187                 ret = PTR_ERR(helper->fb);
 188                 goto err_destroy_gem;
 189         }
 190
 191         helper->fbdev = fbi;
 192
 193         fbi->par = helper;
 194         fbi->flags = FBINFO_FLAG_DEFAULT;
 195         fbi->fbops = &exynos_drm_fb_ops;
 196
 197         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 198         if (ret) {
 199                 DRM_ERROR("failed to allocate cmap.\n");
 200                 goto err_destroy_framebuffer;
 201         }
 202
 203         ret = exynos_drm_fbdev_update(helper, helper->fb);
 204         if (ret < 0)
 205                 goto err_dealloc_cmap;
 206
 207         mutex_unlock(&dev->struct_mutex);
 208         return ret;
 209
 210 err_dealloc_cmap:
 211         fb_dealloc_cmap(&fbi->cmap);
 212 err_destroy_framebuffer:
 213         drm_framebuffer_cleanup(helper->fb);
 214 err_destroy_gem:
 215         exynos_drm_gem_destroy(exynos_gem_obj);
 216 err_release_framebuffer:
 217         framebuffer_release(fbi);
 218
 219 /*
 220  * if failed, all resources allocated above would be released by
 221  * drm_mode_config_cleanup() when drm_load() had been called prior
 222  * to any specific driver such as fimd or hdmi driver.
 223  */
 224 out:
 225         mutex_unlock(&dev->struct_mutex);
 226         return ret;
 227 }
 228
 229 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 230         .fb_probe =     exynos_drm_fbdev_create,
 231 };
 232
 233 bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
 234 {
 235         struct drm_connector *connector;
 236         bool ret = false;
 237
 238         mutex_lock(&dev->mode_config.mutex);
 239         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 240                 if (connector->status != connector_status_connected)
 241                         continue;
 242
 243                 ret = true;
 244                 break;
 245         }
 246         mutex_unlock(&dev->mode_config.mutex);
 247
 248         return ret;
 249 }
 250
 251 int exynos_drm_fbdev_init(struct drm_device *dev)
 252 {
 253         struct exynos_drm_fbdev *fbdev;
 254         struct exynos_drm_private *private = dev->dev_private;
 255         struct drm_fb_helper *helper;
 256         unsigned int num_crtc;
 257         int ret;
 258
 259         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 260                 return 0;
 261
 262         if (!exynos_drm_fbdev_is_anything_connected(dev))
 263                 return 0;
 264
 265         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 266         if (!fbdev)
 267                 return -ENOMEM;
 268
 269         private->fb_helper = helper = &fbdev->drm_fb_helper;
 270         helper->funcs = &exynos_drm_fb_helper_funcs;
 271
 272         num_crtc = dev->mode_config.num_crtc;
 273
 274         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 275         if (ret < 0) {
 276                 DRM_ERROR("failed to initialize drm fb helper.\n");
 277                 goto err_init;
 278         }
 279
 280         ret = drm_fb_helper_single_add_all_connectors(helper);
 281         if (ret < 0) {
 282                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 283                 goto err_setup;
 284
 285         }
 286
 287         /* disable all the possible outputs/crtcs before entering KMS mode */
 288         drm_helper_disable_unused_functions(dev);
 289
 290         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 291         if (ret < 0) {
 292                 DRM_ERROR("failed to set up hw configuration.\n");
 293                 goto err_setup;
 294         }
 295
 296         return 0;
 297
 298 err_setup:
 299         drm_fb_helper_fini(helper);
 300
 301 err_init:
 302         private->fb_helper = NULL;
 303         kfree(fbdev);
 304
 305         return ret;
 306 }
 307
 308 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 309                                       struct drm_fb_helper *fb_helper)
 310 {
 311         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 312         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 313         struct drm_framebuffer *fb;
 314
 315         if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
 316                 vunmap(exynos_gem_obj->buffer->kvaddr);
 317
 318         /* release drm framebuffer and real buffer */
 319         if (fb_helper->fb && fb_helper->fb->funcs) {
 320                 fb = fb_helper->fb;
 321                 if (fb) {
 322                         drm_framebuffer_unregister_private(fb);
 323                         drm_framebuffer_remove(fb);
 324                 }
 325         }
 326
 327         /* release linux framebuffer */
 328         if (fb_helper->fbdev) {
 329                 struct fb_info *info;
 330                 int ret;
 331
 332                 info = fb_helper->fbdev;
 333                 ret = unregister_framebuffer(info);
 334                 if (ret < 0)
 335                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 336
 337                 if (info->cmap.len)
 338                         fb_dealloc_cmap(&info->cmap);
 339
 340                 framebuffer_release(info);
 341         }
 342
 343         drm_fb_helper_fini(fb_helper);
 344 }
 345
 346 void exynos_drm_fbdev_fini(struct drm_device *dev)
 347 {
 348         struct exynos_drm_private *private = dev->dev_private;
 349         struct exynos_drm_fbdev *fbdev;
 350
 351         if (!private || !private->fb_helper)
 352                 return;
 353
 354         fbdev = to_exynos_fbdev(private->fb_helper);
 355
 356         if (fbdev->exynos_gem_obj)
 357                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 358
 359         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 360         kfree(fbdev);
 361         private->fb_helper = NULL;
 362 }
 363
 364 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 365 {
 366         struct exynos_drm_private *private = dev->dev_private;
 367
 368         if (!private || !private->fb_helper)
 369                 return;
 370
 371         drm_modeset_lock_all(dev);
 372         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 373         drm_modeset_unlock_all(dev);
 374 }