kernel/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_fb_helper_surface_size *sizes,
  80                                      struct drm_framebuffer *fb)
  81 {
  82         struct fb_info *fbi = helper->fbdev;
  83         struct exynos_drm_gem_buf *buffer;
  84         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  85         unsigned int nr_pages;
  86         unsigned long offset;
  87
  88         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  89         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  90
  91         /* RGB formats use only one buffer */
  92         buffer = exynos_drm_fb_buffer(fb, 0);
  93         if (!buffer) {
  94                 DRM_DEBUG_KMS("buffer is null.\n");
  95                 return -EFAULT;
  96         }
  97
  98         nr_pages = buffer->size >> PAGE_SHIFT;
  99
 100         buffer->kvaddr = (void __iomem *) vmap(buffer->pages,
 101                         nr_pages, VM_MAP,
 102                         pgprot_writecombine(PAGE_KERNEL));
 103         if (!buffer->kvaddr) {
 104                 DRM_ERROR("failed to map pages to kernel space.\n");
 105                 return -EIO;
 106         }
 107
 108         /* buffer count to framebuffer always is 1 at booting time. */
 109         exynos_drm_fb_set_buf_cnt(fb, 1);
 110
 111         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 112         offset += fbi->var.yoffset * fb->pitches[0];
 113
 114         fbi->screen_base = buffer->kvaddr + offset;
 115         fbi->screen_size = size;
 116         fbi->fix.smem_len = size;
 117
 118         return 0;
 119 }
 120
 121 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 122                                     struct drm_fb_helper_surface_size *sizes)
 123 {
 124         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 125         struct exynos_drm_gem_obj *exynos_gem_obj;
 126         struct drm_device *dev = helper->dev;
 127         struct fb_info *fbi;
 128         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 129         struct platform_device *pdev = dev->platformdev;
 130         unsigned long size;
 131         int ret;
 132
 133         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 134                         sizes->surface_width, sizes->surface_height,
 135                         sizes->surface_bpp);
 136
 137         mode_cmd.width = sizes->surface_width;
 138         mode_cmd.height = sizes->surface_height;
 139         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 140         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 141                                                           sizes->surface_depth);
 142
 143         mutex_lock(&dev->struct_mutex);
 144
 145         fbi = framebuffer_alloc(0, &pdev->dev);
 146         if (!fbi) {
 147                 DRM_ERROR("failed to allocate fb info.\n");
 148                 ret = -ENOMEM;
 149                 goto out;
 150         }
 151
 152         size = mode_cmd.pitches[0] * mode_cmd.height;
 153
 154         exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 155         /*
 156          * If physically contiguous memory allocation fails and if IOMMU is
 157          * supported then try to get buffer from non physically contiguous
 158          * memory area.
 159          */
 160         if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
 161                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 162                 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 163                                                         size);
 164         }
 165
 166         if (IS_ERR(exynos_gem_obj)) {
 167                 ret = PTR_ERR(exynos_gem_obj);
 168                 goto err_release_framebuffer;
 169         }
 170
 171         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 172
 173         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 174                         &exynos_gem_obj->base);
 175         if (IS_ERR(helper->fb)) {
 176                 DRM_ERROR("failed to create drm framebuffer.\n");
 177                 ret = PTR_ERR(helper->fb);
 178                 goto err_destroy_gem;
 179         }
 180
 181         helper->fbdev = fbi;
 182
 183         fbi->par = helper;
 184         fbi->flags = FBINFO_FLAG_DEFAULT;
 185         fbi->fbops = &exynos_drm_fb_ops;
 186
 187         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 188         if (ret) {
 189                 DRM_ERROR("failed to allocate cmap.\n");
 190                 goto err_destroy_framebuffer;
 191         }
 192
 193         ret = exynos_drm_fbdev_update(helper, sizes, helper->fb);
 194         if (ret < 0)
 195                 goto err_dealloc_cmap;
 196
 197         mutex_unlock(&dev->struct_mutex);
 198         return ret;
 199
 200 err_dealloc_cmap:
 201         fb_dealloc_cmap(&fbi->cmap);
 202 err_destroy_framebuffer:
 203         drm_framebuffer_cleanup(helper->fb);
 204 err_destroy_gem:
 205         exynos_drm_gem_destroy(exynos_gem_obj);
 206 err_release_framebuffer:
 207         framebuffer_release(fbi);
 208
 209 /*
 210  * if failed, all resources allocated above would be released by
 211  * drm_mode_config_cleanup() when drm_load() had been called prior
 212  * to any specific driver such as fimd or hdmi driver.
 213  */
 214 out:
 215         mutex_unlock(&dev->struct_mutex);
 216         return ret;
 217 }
 218
 219 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 220         .fb_probe =     exynos_drm_fbdev_create,
 221 };
 222
 223 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
 224 {
 225         struct drm_connector *connector;
 226         bool ret = false;
 227
 228         mutex_lock(&dev->mode_config.mutex);
 229         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 230                 if (connector->status != connector_status_connected)
 231                         continue;
 232
 233                 ret = true;
 234                 break;
 235         }
 236         mutex_unlock(&dev->mode_config.mutex);
 237
 238         return ret;
 239 }
 240
 241 int exynos_drm_fbdev_init(struct drm_device *dev)
 242 {
 243         struct exynos_drm_fbdev *fbdev;
 244         struct exynos_drm_private *private = dev->dev_private;
 245         struct drm_fb_helper *helper;
 246         unsigned int num_crtc;
 247         int ret;
 248
 249         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 250                 return 0;
 251
 252         if (!exynos_drm_fbdev_is_anything_connected(dev))
 253                 return 0;
 254
 255         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 256         if (!fbdev)
 257                 return -ENOMEM;
 258
 259         private->fb_helper = helper = &fbdev->drm_fb_helper;
 260
 261         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 262
 263         num_crtc = dev->mode_config.num_crtc;
 264
 265         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 266         if (ret < 0) {
 267                 DRM_ERROR("failed to initialize drm fb helper.\n");
 268                 goto err_init;
 269         }
 270
 271         ret = drm_fb_helper_single_add_all_connectors(helper);
 272         if (ret < 0) {
 273                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 274                 goto err_setup;
 275
 276         }
 277
 278         /* disable all the possible outputs/crtcs before entering KMS mode */
 279         drm_helper_disable_unused_functions(dev);
 280
 281         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 282         if (ret < 0) {
 283                 DRM_ERROR("failed to set up hw configuration.\n");
 284                 goto err_setup;
 285         }
 286
 287         return 0;
 288
 289 err_setup:
 290         drm_fb_helper_fini(helper);
 291
 292 err_init:
 293         private->fb_helper = NULL;
 294         kfree(fbdev);
 295
 296         return ret;
 297 }
 298
 299 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 300                                       struct drm_fb_helper *fb_helper)
 301 {
 302         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 303         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 304         struct drm_framebuffer *fb;
 305
 306         if (exynos_gem_obj->buffer->kvaddr)
 307                 vunmap(exynos_gem_obj->buffer->kvaddr);
 308
 309         /* release drm framebuffer and real buffer */
 310         if (fb_helper->fb && fb_helper->fb->funcs) {
 311                 fb = fb_helper->fb;
 312                 if (fb) {
 313                         drm_framebuffer_unregister_private(fb);
 314                         drm_framebuffer_remove(fb);
 315                 }
 316         }
 317
 318         /* release linux framebuffer */
 319         if (fb_helper->fbdev) {
 320                 struct fb_info *info;
 321                 int ret;
 322
 323                 info = fb_helper->fbdev;
 324                 ret = unregister_framebuffer(info);
 325                 if (ret < 0)
 326                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 327
 328                 if (info->cmap.len)
 329                         fb_dealloc_cmap(&info->cmap);
 330
 331                 framebuffer_release(info);
 332         }
 333
 334         drm_fb_helper_fini(fb_helper);
 335 }
 336
 337 void exynos_drm_fbdev_fini(struct drm_device *dev)
 338 {
 339         struct exynos_drm_private *private = dev->dev_private;
 340         struct exynos_drm_fbdev *fbdev;
 341
 342         if (!private || !private->fb_helper)
 343                 return;
 344
 345         fbdev = to_exynos_fbdev(private->fb_helper);
 346
 347         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 348         kfree(fbdev);
 349         private->fb_helper = NULL;
 350 }
 351
 352 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 353 {
 354         struct exynos_drm_private *private = dev->dev_private;
 355
 356         if (!private || !private->fb_helper)
 357                 return;
 358
 359         drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
 360 }