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