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         DRM_FB_HELPER_DEFAULT_OPS,
  67         .fb_mmap        = exynos_drm_fb_mmap,
  68         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  69         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  70         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  71 };
  72
  73 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  74                                    struct drm_fb_helper_surface_size *sizes,
  75                                    struct exynos_drm_gem *exynos_gem)
  76 {
  77         struct fb_info *fbi;
  78         struct drm_framebuffer *fb = helper->fb;
  79         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  80         unsigned int nr_pages;
  81         unsigned long offset;
  82
  83         fbi = drm_fb_helper_alloc_fbi(helper);
  84         if (IS_ERR(fbi)) {
  85                 DRM_ERROR("failed to allocate fb info.\n");
  86                 return PTR_ERR(fbi);
  87         }
  88
  89         fbi->par = helper;
  90         fbi->flags = FBINFO_FLAG_DEFAULT;
  91         fbi->fbops = &exynos_drm_fb_ops;
  92
  93         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
  94         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  95
  96         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  97
  98         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
  99                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 100         if (!exynos_gem->kvaddr) {
 101                 DRM_ERROR("failed to map pages to kernel space.\n");
 102                 drm_fb_helper_release_fbi(helper);
 103                 return -EIO;
 104         }
 105
 106         offset = fbi->var.xoffset * fb->format->cpp[0];
 107         offset += fbi->var.yoffset * fb->pitches[0];
 108
 109         fbi->screen_base = exynos_gem->kvaddr + offset;
 110         fbi->screen_size = size;
 111         fbi->fix.smem_len = size;
 112
 113         return 0;
 114 }
 115
 116 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 117                                     struct drm_fb_helper_surface_size *sizes)
 118 {
 119         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 120         struct exynos_drm_gem *exynos_gem;
 121         struct drm_device *dev = helper->dev;
 122         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 123         struct platform_device *pdev = dev->platformdev;
 124         unsigned long size;
 125         int ret;
 126
 127         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 128                         sizes->surface_width, sizes->surface_height,
 129                         sizes->surface_bpp);
 130
 131         mode_cmd.width = sizes->surface_width;
 132         mode_cmd.height = sizes->surface_height;
 133         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 134         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 135                                                           sizes->surface_depth);
 136
 137         size = mode_cmd.pitches[0] * mode_cmd.height;
 138
 139         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 140         /*
 141          * If physically contiguous memory allocation fails and if IOMMU is
 142          * supported then try to get buffer from non physically contiguous
 143          * memory area.
 144          */
 145         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 146                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 147                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 148                                                    size);
 149         }
 150
 151         if (IS_ERR(exynos_gem))
 152                 return PTR_ERR(exynos_gem);
 153
 154         exynos_fbdev->exynos_gem = exynos_gem;
 155
 156         helper->fb =
 157                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 158         if (IS_ERR(helper->fb)) {
 159                 DRM_ERROR("failed to create drm framebuffer.\n");
 160                 ret = PTR_ERR(helper->fb);
 161                 goto err_destroy_gem;
 162         }
 163
 164         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 165         if (ret < 0)
 166                 goto err_destroy_framebuffer;
 167
 168         return ret;
 169
 170 err_destroy_framebuffer:
 171         drm_framebuffer_cleanup(helper->fb);
 172 err_destroy_gem:
 173         exynos_drm_gem_destroy(exynos_gem);
 174
 175         /*
 176          * if failed, all resources allocated above would be released by
 177          * drm_mode_config_cleanup() when drm_load() had been called prior
 178          * to any specific driver such as fimd or hdmi driver.
 179          */
 180
 181         return ret;
 182 }
 183
 184 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 185         .fb_probe =     exynos_drm_fbdev_create,
 186 };
 187
 188 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
 189 {
 190         struct drm_connector *connector;
 191         bool ret = false;
 192
 193         mutex_lock(&dev->mode_config.mutex);
 194         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 195                 if (connector->status != connector_status_connected)
 196                         continue;
 197
 198                 ret = true;
 199                 break;
 200         }
 201         mutex_unlock(&dev->mode_config.mutex);
 202
 203         return ret;
 204 }
 205
 206 int exynos_drm_fbdev_init(struct drm_device *dev)
 207 {
 208         struct exynos_drm_fbdev *fbdev;
 209         struct exynos_drm_private *private = dev->dev_private;
 210         struct drm_fb_helper *helper;
 211         unsigned int num_crtc;
 212         int ret;
 213
 214         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 215                 return 0;
 216
 217         if (!exynos_drm_fbdev_is_anything_connected(dev))
 218                 return 0;
 219
 220         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 221         if (!fbdev)
 222                 return -ENOMEM;
 223
 224         private->fb_helper = helper = &fbdev->drm_fb_helper;
 225
 226         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 227
 228         num_crtc = dev->mode_config.num_crtc;
 229
 230         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 231         if (ret < 0) {
 232                 DRM_ERROR("failed to initialize drm fb helper.\n");
 233                 goto err_init;
 234         }
 235
 236         ret = drm_fb_helper_single_add_all_connectors(helper);
 237         if (ret < 0) {
 238                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 239                 goto err_setup;
 240
 241         }
 242
 243         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 244         if (ret < 0) {
 245                 DRM_ERROR("failed to set up hw configuration.\n");
 246                 goto err_setup;
 247         }
 248
 249         return 0;
 250
 251 err_setup:
 252         drm_fb_helper_fini(helper);
 253
 254 err_init:
 255         private->fb_helper = NULL;
 256         kfree(fbdev);
 257
 258         return ret;
 259 }
 260
 261 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 262                                       struct drm_fb_helper *fb_helper)
 263 {
 264         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 265         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 266         struct drm_framebuffer *fb;
 267
 268         vunmap(exynos_gem->kvaddr);
 269
 270         /* release drm framebuffer and real buffer */
 271         if (fb_helper->fb && fb_helper->fb->funcs) {
 272                 fb = fb_helper->fb;
 273                 if (fb)
 274                         drm_framebuffer_remove(fb);
 275         }
 276
 277         drm_fb_helper_unregister_fbi(fb_helper);
 278         drm_fb_helper_release_fbi(fb_helper);
 279
 280         drm_fb_helper_fini(fb_helper);
 281 }
 282
 283 void exynos_drm_fbdev_fini(struct drm_device *dev)
 284 {
 285         struct exynos_drm_private *private = dev->dev_private;
 286         struct exynos_drm_fbdev *fbdev;
 287
 288         if (!private || !private->fb_helper)
 289                 return;
 290
 291         fbdev = to_exynos_fbdev(private->fb_helper);
 292
 293         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 294         kfree(fbdev);
 295         private->fb_helper = NULL;
 296 }
 297
 298 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 299 {
 300         struct exynos_drm_private *private = dev->dev_private;
 301
 302         if (!private || !private->fb_helper)
 303                 return;
 304
 305         drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
 306 }
 307
 308 void exynos_drm_output_poll_changed(struct drm_device *dev)
 309 {
 310         struct exynos_drm_private *private = dev->dev_private;
 311         struct drm_fb_helper *fb_helper = private->fb_helper;
 312
 313         if (fb_helper)
 314                 drm_fb_helper_hotplug_event(fb_helper);
 315         else
 316                 exynos_drm_fbdev_init(dev);
 317 }