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(helper->dev->dev, vma, exynos_gem->pages,
  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         mutex_lock(&dev->struct_mutex);
 142
 143         size = mode_cmd.pitches[0] * mode_cmd.height;
 144
 145         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 146         /*
 147          * If physically contiguous memory allocation fails and if IOMMU is
 148          * supported then try to get buffer from non physically contiguous
 149          * memory area.
 150          */
 151         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 152                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 153                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 154                                                    size);
 155         }
 156
 157         if (IS_ERR(exynos_gem)) {
 158                 ret = PTR_ERR(exynos_gem);
 159                 goto out;
 160         }
 161
 162         exynos_fbdev->exynos_gem = exynos_gem;
 163
 164         helper->fb =
 165                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 166         if (IS_ERR(helper->fb)) {
 167                 DRM_ERROR("failed to create drm framebuffer.\n");
 168                 ret = PTR_ERR(helper->fb);
 169                 goto err_destroy_gem;
 170         }
 171
 172         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 173         if (ret < 0)
 174                 goto err_destroy_framebuffer;
 175
 176         mutex_unlock(&dev->struct_mutex);
 177         return ret;
 178
 179 err_destroy_framebuffer:
 180         drm_framebuffer_cleanup(helper->fb);
 181 err_destroy_gem:
 182         exynos_drm_gem_destroy(exynos_gem);
 183
 184 /*
 185  * if failed, all resources allocated above would be released by
 186  * drm_mode_config_cleanup() when drm_load() had been called prior
 187  * to any specific driver such as fimd or hdmi driver.
 188  */
 189 out:
 190         mutex_unlock(&dev->struct_mutex);
 191         return ret;
 192 }
 193
 194 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 195         .fb_probe =     exynos_drm_fbdev_create,
 196 };
 197
 198 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
 199 {
 200         struct drm_connector *connector;
 201         bool ret = false;
 202
 203         mutex_lock(&dev->mode_config.mutex);
 204         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 205                 if (connector->status != connector_status_connected)
 206                         continue;
 207
 208                 ret = true;
 209                 break;
 210         }
 211         mutex_unlock(&dev->mode_config.mutex);
 212
 213         return ret;
 214 }
 215
 216 int exynos_drm_fbdev_init(struct drm_device *dev)
 217 {
 218         struct exynos_drm_fbdev *fbdev;
 219         struct exynos_drm_private *private = dev->dev_private;
 220         struct drm_fb_helper *helper;
 221         unsigned int num_crtc;
 222         int ret;
 223
 224         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 225                 return 0;
 226
 227         if (!exynos_drm_fbdev_is_anything_connected(dev))
 228                 return 0;
 229
 230         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 231         if (!fbdev)
 232                 return -ENOMEM;
 233
 234         private->fb_helper = helper = &fbdev->drm_fb_helper;
 235
 236         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 237
 238         num_crtc = dev->mode_config.num_crtc;
 239
 240         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 241         if (ret < 0) {
 242                 DRM_ERROR("failed to initialize drm fb helper.\n");
 243                 goto err_init;
 244         }
 245
 246         ret = drm_fb_helper_single_add_all_connectors(helper);
 247         if (ret < 0) {
 248                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 249                 goto err_setup;
 250
 251         }
 252
 253         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 254         if (ret < 0) {
 255                 DRM_ERROR("failed to set up hw configuration.\n");
 256                 goto err_setup;
 257         }
 258
 259         return 0;
 260
 261 err_setup:
 262         drm_fb_helper_fini(helper);
 263
 264 err_init:
 265         private->fb_helper = NULL;
 266         kfree(fbdev);
 267
 268         return ret;
 269 }
 270
 271 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 272                                       struct drm_fb_helper *fb_helper)
 273 {
 274         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 275         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 276         struct drm_framebuffer *fb;
 277
 278         if (exynos_gem->kvaddr)
 279                 vunmap(exynos_gem->kvaddr);
 280
 281         /* release drm framebuffer and real buffer */
 282         if (fb_helper->fb && fb_helper->fb->funcs) {
 283                 fb = fb_helper->fb;
 284                 if (fb) {
 285                         drm_framebuffer_unregister_private(fb);
 286                         drm_framebuffer_remove(fb);
 287                 }
 288         }
 289
 290         drm_fb_helper_unregister_fbi(fb_helper);
 291         drm_fb_helper_release_fbi(fb_helper);
 292
 293         drm_fb_helper_fini(fb_helper);
 294 }
 295
 296 void exynos_drm_fbdev_fini(struct drm_device *dev)
 297 {
 298         struct exynos_drm_private *private = dev->dev_private;
 299         struct exynos_drm_fbdev *fbdev;
 300
 301         if (!private || !private->fb_helper)
 302                 return;
 303
 304         fbdev = to_exynos_fbdev(private->fb_helper);
 305
 306         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 307         kfree(fbdev);
 308         private->fb_helper = NULL;
 309 }
 310
 311 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 312 {
 313         struct exynos_drm_private *private = dev->dev_private;
 314
 315         if (!private || !private->fb_helper)
 316                 return;
 317
 318         drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
 319 }