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_iommu.h"
  25
  26 #define MAX_CONNECTOR           4
  27 #define PREFERRED_BPP           32
  28
  29 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  30                                 drm_fb_helper)
  31
  32 struct exynos_drm_fbdev {
  33         struct drm_fb_helper    drm_fb_helper;
  34         struct exynos_drm_gem   *exynos_gem;
  35 };
  36
  37 static int exynos_drm_fb_mmap(struct fb_info *info,
  38                         struct vm_area_struct *vma)
  39 {
  40         struct drm_fb_helper *helper = info->par;
  41         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  42         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
  43         unsigned long vm_size;
  44         int ret;
  45
  46         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  47
  48         vm_size = vma->vm_end - vma->vm_start;
  49
  50         if (vm_size > exynos_gem->size)
  51                 return -EINVAL;
  52
  53         ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
  54                              exynos_gem->dma_addr, exynos_gem->size,
  55                              &exynos_gem->dma_attrs);
  56         if (ret < 0) {
  57                 DRM_ERROR("failed to mmap.\n");
  58                 return ret;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static struct fb_ops exynos_drm_fb_ops = {
  65         .owner          = THIS_MODULE,
  66         .fb_mmap        = exynos_drm_fb_mmap,
  67         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  68         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  69         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  70         .fb_check_var   = drm_fb_helper_check_var,
  71         .fb_set_par     = drm_fb_helper_set_par,
  72         .fb_blank       = drm_fb_helper_blank,
  73         .fb_pan_display = drm_fb_helper_pan_display,
  74         .fb_setcmap     = drm_fb_helper_setcmap,
  75 };
  76
  77 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  78                                    struct drm_fb_helper_surface_size *sizes,
  79                                    struct exynos_drm_gem *exynos_gem)
  80 {
  81         struct fb_info *fbi;
  82         struct drm_framebuffer *fb = helper->fb;
  83         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  84         unsigned int nr_pages;
  85         unsigned long offset;
  86
  87         fbi = drm_fb_helper_alloc_fbi(helper);
  88         if (IS_ERR(fbi)) {
  89                 DRM_ERROR("failed to allocate fb info.\n");
  90                 return PTR_ERR(fbi);
  91         }
  92
  93         fbi->par = helper;
  94         fbi->flags = FBINFO_FLAG_DEFAULT;
  95         fbi->fbops = &exynos_drm_fb_ops;
  96
  97         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  98         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  99
 100         nr_pages = exynos_gem->size >> PAGE_SHIFT;
 101
 102         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
 103                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 104         if (!exynos_gem->kvaddr) {
 105                 DRM_ERROR("failed to map pages to kernel space.\n");
 106                 drm_fb_helper_release_fbi(helper);
 107                 return -EIO;
 108         }
 109
 110         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 111         offset += fbi->var.yoffset * fb->pitches[0];
 112
 113         fbi->screen_base = exynos_gem->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 *exynos_gem;
 125         struct drm_device *dev = helper->dev;
 126         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 127         struct platform_device *pdev = dev->platformdev;
 128         unsigned long size;
 129         int ret;
 130
 131         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 132                         sizes->surface_width, sizes->surface_height,
 133                         sizes->surface_bpp);
 134
 135         mode_cmd.width = sizes->surface_width;
 136         mode_cmd.height = sizes->surface_height;
 137         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 138         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 139                                                           sizes->surface_depth);
 140
 141         size = mode_cmd.pitches[0] * mode_cmd.height;
 142
 143         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 144         /*
 145          * If physically contiguous memory allocation fails and if IOMMU is
 146          * supported then try to get buffer from non physically contiguous
 147          * memory area.
 148          */
 149         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 150                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 151                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 152                                                    size);
 153         }
 154
 155         if (IS_ERR(exynos_gem))
 156                 return PTR_ERR(exynos_gem);
 157
 158         exynos_fbdev->exynos_gem = exynos_gem;
 159
 160         helper->fb =
 161                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 162         if (IS_ERR(helper->fb)) {
 163                 DRM_ERROR("failed to create drm framebuffer.\n");
 164                 ret = PTR_ERR(helper->fb);
 165                 goto err_destroy_gem;
 166         }
 167
 168         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 169         if (ret < 0)
 170                 goto err_destroy_framebuffer;
 171
 172         return ret;
 173
 174 err_destroy_framebuffer:
 175         drm_framebuffer_cleanup(helper->fb);
 176 err_destroy_gem:
 177         exynos_drm_gem_destroy(exynos_gem);
 178
 179         /*
 180          * if failed, all resources allocated above would be released by
 181          * drm_mode_config_cleanup() when drm_load() had been called prior
 182          * to any specific driver such as fimd or hdmi driver.
 183          */
 184
 185         return ret;
 186 }
 187
 188 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 189         .fb_probe =     exynos_drm_fbdev_create,
 190 };
 191
 192 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
 193 {
 194         struct drm_connector *connector;
 195         bool ret = false;
 196
 197         mutex_lock(&dev->mode_config.mutex);
 198         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 199                 if (connector->status != connector_status_connected)
 200                         continue;
 201
 202                 ret = true;
 203                 break;
 204         }
 205         mutex_unlock(&dev->mode_config.mutex);
 206
 207         return ret;
 208 }
 209
 210 int exynos_drm_fbdev_init(struct drm_device *dev)
 211 {
 212         struct exynos_drm_fbdev *fbdev;
 213         struct exynos_drm_private *private = dev->dev_private;
 214         struct drm_fb_helper *helper;
 215         unsigned int num_crtc;
 216         int ret;
 217
 218         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 219                 return 0;
 220
 221         if (!exynos_drm_fbdev_is_anything_connected(dev))
 222                 return 0;
 223
 224         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 225         if (!fbdev)
 226                 return -ENOMEM;
 227
 228         private->fb_helper = helper = &fbdev->drm_fb_helper;
 229
 230         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 231
 232         num_crtc = dev->mode_config.num_crtc;
 233
 234         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 235         if (ret < 0) {
 236                 DRM_ERROR("failed to initialize drm fb helper.\n");
 237                 goto err_init;
 238         }
 239
 240         ret = drm_fb_helper_single_add_all_connectors(helper);
 241         if (ret < 0) {
 242                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 243                 goto err_setup;
 244
 245         }
 246
 247         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 248         if (ret < 0) {
 249                 DRM_ERROR("failed to set up hw configuration.\n");
 250                 goto err_setup;
 251         }
 252
 253         return 0;
 254
 255 err_setup:
 256         drm_fb_helper_fini(helper);
 257
 258 err_init:
 259         private->fb_helper = NULL;
 260         kfree(fbdev);
 261
 262         return ret;
 263 }
 264
 265 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 266                                       struct drm_fb_helper *fb_helper)
 267 {
 268         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 269         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 270         struct drm_framebuffer *fb;
 271
 272         if (exynos_gem->kvaddr)
 273                 vunmap(exynos_gem->kvaddr);
 274
 275         /* release drm framebuffer and real buffer */
 276         if (fb_helper->fb && fb_helper->fb->funcs) {
 277                 fb = fb_helper->fb;
 278                 if (fb) {
 279                         drm_framebuffer_unregister_private(fb);
 280                         drm_framebuffer_remove(fb);
 281                 }
 282         }
 283
 284         drm_fb_helper_unregister_fbi(fb_helper);
 285         drm_fb_helper_release_fbi(fb_helper);
 286
 287         drm_fb_helper_fini(fb_helper);
 288 }
 289
 290 void exynos_drm_fbdev_fini(struct drm_device *dev)
 291 {
 292         struct exynos_drm_private *private = dev->dev_private;
 293         struct exynos_drm_fbdev *fbdev;
 294
 295         if (!private || !private->fb_helper)
 296                 return;
 297
 298         fbdev = to_exynos_fbdev(private->fb_helper);
 299
 300         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 301         kfree(fbdev);
 302         private->fb_helper = NULL;
 303 }
 304
 305 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 306 {
 307         struct exynos_drm_private *private = dev->dev_private;
 308
 309         if (!private || !private->fb_helper)
 310                 return;
 311
 312         drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
 313 }
 314
 315 void exynos_drm_output_poll_changed(struct drm_device *dev)
 316 {
 317         struct exynos_drm_private *private = dev->dev_private;
 318         struct drm_fb_helper *fb_helper = private->fb_helper;
 319
 320         if (fb_helper)
 321                 drm_fb_helper_hotplug_event(fb_helper);
 322         else
 323                 exynos_drm_fbdev_init(dev);
 324 }