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_LOG_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         if (is_drm_iommu_supported(dev))
 127                 fbi->fix.smem_start = (unsigned long)
 128                         (page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
 129         else
 130                 fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
 131
 132         fbi->screen_size = size;
 133         fbi->fix.smem_len = size;
 134
 135         return 0;
 136 }
 137
 138 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 139                                     struct drm_fb_helper_surface_size *sizes)
 140 {
 141         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 142         struct exynos_drm_gem_obj *exynos_gem_obj;
 143         struct drm_device *dev = helper->dev;
 144         struct fb_info *fbi;
 145         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 146         struct platform_device *pdev = dev->platformdev;
 147         unsigned long size;
 148         int ret;
 149
 150         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 151                         sizes->surface_width, sizes->surface_height,
 152                         sizes->surface_bpp);
 153
 154         mode_cmd.width = sizes->surface_width;
 155         mode_cmd.height = sizes->surface_height;
 156         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 157         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 158                                                           sizes->surface_depth);
 159
 160         mutex_lock(&dev->struct_mutex);
 161
 162         fbi = framebuffer_alloc(0, &pdev->dev);
 163         if (!fbi) {
 164                 DRM_ERROR("failed to allocate fb info.\n");
 165                 ret = -ENOMEM;
 166                 goto out;
 167         }
 168
 169         size = mode_cmd.pitches[0] * mode_cmd.height;
 170
 171         exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 172         /*
 173          * If physically contiguous memory allocation fails and if IOMMU is
 174          * supported then try to get buffer from non physically contiguous
 175          * memory area.
 176          */
 177         if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
 178                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 179                 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 180                                                         size);
 181         }
 182
 183         if (IS_ERR(exynos_gem_obj)) {
 184                 ret = PTR_ERR(exynos_gem_obj);
 185                 goto err_release_framebuffer;
 186         }
 187
 188         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 189
 190         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 191                         &exynos_gem_obj->base);
 192         if (IS_ERR(helper->fb)) {
 193                 DRM_ERROR("failed to create drm framebuffer.\n");
 194                 ret = PTR_ERR(helper->fb);
 195                 goto err_destroy_gem;
 196         }
 197
 198         helper->fbdev = fbi;
 199
 200         fbi->par = helper;
 201         fbi->flags = FBINFO_FLAG_DEFAULT;
 202         fbi->fbops = &exynos_drm_fb_ops;
 203
 204         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 205         if (ret) {
 206                 DRM_ERROR("failed to allocate cmap.\n");
 207                 goto err_destroy_framebuffer;
 208         }
 209
 210         ret = exynos_drm_fbdev_update(helper, helper->fb);
 211         if (ret < 0)
 212                 goto err_dealloc_cmap;
 213
 214         mutex_unlock(&dev->struct_mutex);
 215         return ret;
 216
 217 err_dealloc_cmap:
 218         fb_dealloc_cmap(&fbi->cmap);
 219 err_destroy_framebuffer:
 220         drm_framebuffer_cleanup(helper->fb);
 221 err_destroy_gem:
 222         exynos_drm_gem_destroy(exynos_gem_obj);
 223 err_release_framebuffer:
 224         framebuffer_release(fbi);
 225
 226 /*
 227  * if failed, all resources allocated above would be released by
 228  * drm_mode_config_cleanup() when drm_load() had been called prior
 229  * to any specific driver such as fimd or hdmi driver.
 230  */
 231 out:
 232         mutex_unlock(&dev->struct_mutex);
 233         return ret;
 234 }
 235
 236 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 237         .fb_probe =     exynos_drm_fbdev_create,
 238 };
 239
 240 int exynos_drm_fbdev_init(struct drm_device *dev)
 241 {
 242         struct exynos_drm_fbdev *fbdev;
 243         struct exynos_drm_private *private = dev->dev_private;
 244         struct drm_fb_helper *helper;
 245         unsigned int num_crtc;
 246         int ret;
 247
 248         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 249                 return 0;
 250
 251         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 252         if (!fbdev)
 253                 return -ENOMEM;
 254
 255         private->fb_helper = helper = &fbdev->drm_fb_helper;
 256         helper->funcs = &exynos_drm_fb_helper_funcs;
 257
 258         num_crtc = dev->mode_config.num_crtc;
 259
 260         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 261         if (ret < 0) {
 262                 DRM_ERROR("failed to initialize drm fb helper.\n");
 263                 goto err_init;
 264         }
 265
 266         ret = drm_fb_helper_single_add_all_connectors(helper);
 267         if (ret < 0) {
 268                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 269                 goto err_setup;
 270
 271         }
 272
 273         /* disable all the possible outputs/crtcs before entering KMS mode */
 274         drm_helper_disable_unused_functions(dev);
 275
 276         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 277         if (ret < 0) {
 278                 DRM_ERROR("failed to set up hw configuration.\n");
 279                 goto err_setup;
 280         }
 281
 282         return 0;
 283
 284 err_setup:
 285         drm_fb_helper_fini(helper);
 286
 287 err_init:
 288         private->fb_helper = NULL;
 289         kfree(fbdev);
 290
 291         return ret;
 292 }
 293
 294 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 295                                       struct drm_fb_helper *fb_helper)
 296 {
 297         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 298         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 299         struct drm_framebuffer *fb;
 300
 301         if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
 302                 vunmap(exynos_gem_obj->buffer->kvaddr);
 303
 304         /* release drm framebuffer and real buffer */
 305         if (fb_helper->fb && fb_helper->fb->funcs) {
 306                 fb = fb_helper->fb;
 307                 if (fb) {
 308                         drm_framebuffer_unregister_private(fb);
 309                         drm_framebuffer_remove(fb);
 310                 }
 311         }
 312
 313         /* release linux framebuffer */
 314         if (fb_helper->fbdev) {
 315                 struct fb_info *info;
 316                 int ret;
 317
 318                 info = fb_helper->fbdev;
 319                 ret = unregister_framebuffer(info);
 320                 if (ret < 0)
 321                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 322
 323                 if (info->cmap.len)
 324                         fb_dealloc_cmap(&info->cmap);
 325
 326                 framebuffer_release(info);
 327         }
 328
 329         drm_fb_helper_fini(fb_helper);
 330 }
 331
 332 void exynos_drm_fbdev_fini(struct drm_device *dev)
 333 {
 334         struct exynos_drm_private *private = dev->dev_private;
 335         struct exynos_drm_fbdev *fbdev;
 336
 337         if (!private || !private->fb_helper)
 338                 return;
 339
 340         fbdev = to_exynos_fbdev(private->fb_helper);
 341
 342         if (fbdev->exynos_gem_obj)
 343                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 344
 345         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 346         kfree(fbdev);
 347         private->fb_helper = NULL;
 348 }
 349
 350 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 351 {
 352         struct exynos_drm_private *private = dev->dev_private;
 353
 354         if (!private || !private->fb_helper)
 355                 return;
 356
 357         drm_modeset_lock_all(dev);
 358         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 359         drm_modeset_unlock_all(dev);
 360 }