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
  20 #include "exynos_drm_drv.h"
  21 #include "exynos_drm_fb.h"
  22 #include "exynos_drm_gem.h"
  23 #include "exynos_drm_iommu.h"
  24
  25 #define MAX_CONNECTOR           4
  26 #define PREFERRED_BPP           32
  27
  28 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  29                                 drm_fb_helper)
  30
  31 struct exynos_drm_fbdev {
  32         struct drm_fb_helper            drm_fb_helper;
  33         struct exynos_drm_gem_obj       *exynos_gem_obj;
  34 };
  35
  36 static int exynos_drm_fb_mmap(struct fb_info *info,
  37                         struct vm_area_struct *vma)
  38 {
  39         struct drm_fb_helper *helper = info->par;
  40         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  41         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
  42         struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
  43         unsigned long vm_size;
  44         int ret;
  45
  46         DRM_DEBUG_KMS("%s\n", __func__);
  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_DEBUG_KMS("%s\n", __FILE__);
  88
  89         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  90         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  91
  92         /* RGB formats use only one buffer */
  93         buffer = exynos_drm_fb_buffer(fb, 0);
  94         if (!buffer) {
  95                 DRM_LOG_KMS("buffer is null.\n");
  96                 return -EFAULT;
  97         }
  98
  99         /* map pages with kernel virtual space. */
 100         if (!buffer->kvaddr) {
 101                 if (is_drm_iommu_supported(dev)) {
 102                         unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
 103
 104                         buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
 105                                         pgprot_writecombine(PAGE_KERNEL));
 106                 } else {
 107                         phys_addr_t dma_addr = buffer->dma_addr;
 108                         if (dma_addr)
 109                                 buffer->kvaddr = phys_to_virt(dma_addr);
 110                         else
 111                                 buffer->kvaddr = (void __iomem *)NULL;
 112                 }
 113                 if (!buffer->kvaddr) {
 114                         DRM_ERROR("failed to map pages to kernel space.\n");
 115                         return -EIO;
 116                 }
 117         }
 118
 119         /* buffer count to framebuffer always is 1 at booting time. */
 120         exynos_drm_fb_set_buf_cnt(fb, 1);
 121
 122         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 123         offset += fbi->var.yoffset * fb->pitches[0];
 124
 125         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 126         fbi->screen_base = buffer->kvaddr + offset;
 127         if (is_drm_iommu_supported(dev))
 128                 fbi->fix.smem_start = (unsigned long)
 129                         (page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
 130         else
 131                 fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
 132
 133         fbi->screen_size = size;
 134         fbi->fix.smem_len = size;
 135
 136         return 0;
 137 }
 138
 139 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 140                                     struct drm_fb_helper_surface_size *sizes)
 141 {
 142         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 143         struct exynos_drm_gem_obj *exynos_gem_obj;
 144         struct drm_device *dev = helper->dev;
 145         struct fb_info *fbi;
 146         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 147         struct platform_device *pdev = dev->platformdev;
 148         unsigned long size;
 149         int ret;
 150
 151         DRM_DEBUG_KMS("%s\n", __FILE__);
 152
 153         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 154                         sizes->surface_width, sizes->surface_height,
 155                         sizes->surface_bpp);
 156
 157         mode_cmd.width = sizes->surface_width;
 158         mode_cmd.height = sizes->surface_height;
 159         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 160         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 161                                                           sizes->surface_depth);
 162
 163         mutex_lock(&dev->struct_mutex);
 164
 165         fbi = framebuffer_alloc(0, &pdev->dev);
 166         if (!fbi) {
 167                 DRM_ERROR("failed to allocate fb info.\n");
 168                 ret = -ENOMEM;
 169                 goto out;
 170         }
 171
 172         size = mode_cmd.pitches[0] * mode_cmd.height;
 173
 174         /* 0 means to allocate physically continuous memory */
 175         exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
 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_OR_NULL(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 int exynos_drm_fbdev_probe(struct drm_fb_helper *helper,
 230                                    struct drm_fb_helper_surface_size *sizes)
 231 {
 232         int ret = 0;
 233
 234         DRM_DEBUG_KMS("%s\n", __FILE__);
 235
 236         /*
 237          * with !helper->fb, it means that this funcion is called first time
 238          * and after that, the helper->fb would be used as clone mode.
 239          */
 240         if (!helper->fb) {
 241                 ret = exynos_drm_fbdev_create(helper, sizes);
 242                 if (ret < 0) {
 243                         DRM_ERROR("failed to create fbdev.\n");
 244                         return ret;
 245                 }
 246
 247                 /*
 248                  * fb_helper expects a value more than 1 if succeed
 249                  * because register_framebuffer() should be called.
 250                  */
 251                 ret = 1;
 252         }
 253
 254         return ret;
 255 }
 256
 257 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 258         .fb_probe =     exynos_drm_fbdev_probe,
 259 };
 260
 261 int exynos_drm_fbdev_init(struct drm_device *dev)
 262 {
 263         struct exynos_drm_fbdev *fbdev;
 264         struct exynos_drm_private *private = dev->dev_private;
 265         struct drm_fb_helper *helper;
 266         unsigned int num_crtc;
 267         int ret;
 268
 269         DRM_DEBUG_KMS("%s\n", __FILE__);
 270
 271         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 272                 return 0;
 273
 274         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 275         if (!fbdev) {
 276                 DRM_ERROR("failed to allocate drm fbdev.\n");
 277                 return -ENOMEM;
 278         }
 279
 280         private->fb_helper = helper = &fbdev->drm_fb_helper;
 281         helper->funcs = &exynos_drm_fb_helper_funcs;
 282
 283         num_crtc = dev->mode_config.num_crtc;
 284
 285         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 286         if (ret < 0) {
 287                 DRM_ERROR("failed to initialize drm fb helper.\n");
 288                 goto err_init;
 289         }
 290
 291         ret = drm_fb_helper_single_add_all_connectors(helper);
 292         if (ret < 0) {
 293                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 294                 goto err_setup;
 295
 296         }
 297
 298         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 299         if (ret < 0) {
 300                 DRM_ERROR("failed to set up hw configuration.\n");
 301                 goto err_setup;
 302         }
 303
 304         return 0;
 305
 306 err_setup:
 307         drm_fb_helper_fini(helper);
 308
 309 err_init:
 310         private->fb_helper = NULL;
 311         kfree(fbdev);
 312
 313         return ret;
 314 }
 315
 316 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 317                                       struct drm_fb_helper *fb_helper)
 318 {
 319         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 320         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 321         struct drm_framebuffer *fb;
 322
 323         if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
 324                 vunmap(exynos_gem_obj->buffer->kvaddr);
 325
 326         /* release drm framebuffer and real buffer */
 327         if (fb_helper->fb && fb_helper->fb->funcs) {
 328                 fb = fb_helper->fb;
 329                 if (fb)
 330                         drm_framebuffer_remove(fb);
 331         }
 332
 333         /* release linux framebuffer */
 334         if (fb_helper->fbdev) {
 335                 struct fb_info *info;
 336                 int ret;
 337
 338                 info = fb_helper->fbdev;
 339                 ret = unregister_framebuffer(info);
 340                 if (ret < 0)
 341                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 342
 343                 if (info->cmap.len)
 344                         fb_dealloc_cmap(&info->cmap);
 345
 346                 framebuffer_release(info);
 347         }
 348
 349         drm_fb_helper_fini(fb_helper);
 350 }
 351
 352 void exynos_drm_fbdev_fini(struct drm_device *dev)
 353 {
 354         struct exynos_drm_private *private = dev->dev_private;
 355         struct exynos_drm_fbdev *fbdev;
 356
 357         if (!private || !private->fb_helper)
 358                 return;
 359
 360         fbdev = to_exynos_fbdev(private->fb_helper);
 361
 362         if (fbdev->exynos_gem_obj)
 363                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 364
 365         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 366         kfree(fbdev);
 367         private->fb_helper = NULL;
 368 }
 369
 370 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 371 {
 372         struct exynos_drm_private *private = dev->dev_private;
 373
 374         if (!private || !private->fb_helper)
 375                 return;
 376
 377         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 378 }