drivers/gpu/drm/exynos/exynos_drm_fbdev.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* exynos_drm_fbdev.c
   3  *
   4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   5  * Authors:
   6  *      Inki Dae <inki.dae@samsung.com>
   7  *      Joonyoung Shim <jy0922.shim@samsung.com>
   8  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   9  */
  10
  11 #include <linux/console.h>
  12 #include <linux/dma-mapping.h>
  13 #include <linux/vmalloc.h>
  14
  15 #include <drm/drm_crtc.h>
  16 #include <drm/drm_fb_helper.h>
  17 #include <drm/drm_fourcc.h>
  18 #include <drm/drm_probe_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
  25 #define MAX_CONNECTOR           4
  26 #define PREFERRED_BPP           32
  27
  28 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  29                                 drm_fb_helper)
  30
  31 struct exynos_drm_fbdev {
  32         struct drm_fb_helper    drm_fb_helper;
  33         struct exynos_drm_gem   *exynos_gem;
  34 };
  35
  36 static int exynos_drm_fb_mmap(struct fb_info *info,
  37                         struct vm_area_struct *vma)
  38 {
  39         struct drm_fb_helper *helper = info->par;
  40         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  41         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
  42         unsigned long vm_size;
  43         int ret;
  44
  45         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  46
  47         vm_size = vma->vm_end - vma->vm_start;
  48
  49         if (vm_size > exynos_gem->size)
  50                 return -EINVAL;
  51
  52         ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
  53                              exynos_gem->dma_addr, exynos_gem->size,
  54                              exynos_gem->dma_attrs);
  55         if (ret < 0) {
  56                 DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
  57                 return ret;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static const struct fb_ops exynos_drm_fb_ops = {
  64         .owner          = THIS_MODULE,
  65         DRM_FB_HELPER_DEFAULT_OPS,
  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 };
  71
  72 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  73                                    struct drm_fb_helper_surface_size *sizes,
  74                                    struct exynos_drm_gem *exynos_gem)
  75 {
  76         struct fb_info *fbi;
  77         struct drm_framebuffer *fb = helper->fb;
  78         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  79         unsigned long offset;
  80
  81         fbi = drm_fb_helper_alloc_fbi(helper);
  82         if (IS_ERR(fbi)) {
  83                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  84                               "failed to allocate fb info.\n");
  85                 return PTR_ERR(fbi);
  86         }
  87
  88         fbi->fbops = &exynos_drm_fb_ops;
  89
  90         drm_fb_helper_fill_info(fbi, helper, sizes);
  91
  92         offset = fbi->var.xoffset * fb->format->cpp[0];
  93         offset += fbi->var.yoffset * fb->pitches[0];
  94
  95         fbi->screen_buffer = exynos_gem->kvaddr + offset;
  96         fbi->screen_size = size;
  97         fbi->fix.smem_len = size;
  98
  99         return 0;
 100 }
 101
 102 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 103                                     struct drm_fb_helper_surface_size *sizes)
 104 {
 105         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 106         struct exynos_drm_gem *exynos_gem;
 107         struct drm_device *dev = helper->dev;
 108         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 109         unsigned long size;
 110         int ret;
 111
 112         DRM_DEV_DEBUG_KMS(dev->dev,
 113                           "surface width(%d), height(%d) and bpp(%d\n",
 114                           sizes->surface_width, sizes->surface_height,
 115                           sizes->surface_bpp);
 116
 117         mode_cmd.width = sizes->surface_width;
 118         mode_cmd.height = sizes->surface_height;
 119         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 120         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 121                                                           sizes->surface_depth);
 122
 123         size = mode_cmd.pitches[0] * mode_cmd.height;
 124
 125         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
 126         if (IS_ERR(exynos_gem))
 127                 return PTR_ERR(exynos_gem);
 128
 129         exynos_fbdev->exynos_gem = exynos_gem;
 130
 131         helper->fb =
 132                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 133         if (IS_ERR(helper->fb)) {
 134                 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
 135                 ret = PTR_ERR(helper->fb);
 136                 goto err_destroy_gem;
 137         }
 138
 139         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 140         if (ret < 0)
 141                 goto err_destroy_framebuffer;
 142
 143         return ret;
 144
 145 err_destroy_framebuffer:
 146         drm_framebuffer_cleanup(helper->fb);
 147 err_destroy_gem:
 148         exynos_drm_gem_destroy(exynos_gem);
 149
 150         /*
 151          * if failed, all resources allocated above would be released by
 152          * drm_mode_config_cleanup() when drm_load() had been called prior
 153          * to any specific driver such as fimd or hdmi driver.
 154          */
 155
 156         return ret;
 157 }
 158
 159 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 160         .fb_probe =     exynos_drm_fbdev_create,
 161 };
 162
 163 int exynos_drm_fbdev_init(struct drm_device *dev)
 164 {
 165         struct exynos_drm_fbdev *fbdev;
 166         struct exynos_drm_private *private = dev->dev_private;
 167         struct drm_fb_helper *helper;
 168         int ret;
 169
 170         if (!dev->mode_config.num_crtc)
 171                 return 0;
 172
 173         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 174         if (!fbdev)
 175                 return -ENOMEM;
 176
 177         private->fb_helper = helper = &fbdev->drm_fb_helper;
 178
 179         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 180
 181         ret = drm_fb_helper_init(dev, helper);
 182         if (ret < 0) {
 183                 DRM_DEV_ERROR(dev->dev,
 184                               "failed to initialize drm fb helper.\n");
 185                 goto err_init;
 186         }
 187
 188         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 189         if (ret < 0) {
 190                 DRM_DEV_ERROR(dev->dev,
 191                               "failed to set up hw configuration.\n");
 192                 goto err_setup;
 193         }
 194
 195         return 0;
 196
 197 err_setup:
 198         drm_fb_helper_fini(helper);
 199
 200 err_init:
 201         private->fb_helper = NULL;
 202         kfree(fbdev);
 203
 204         return ret;
 205 }
 206
 207 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 208                                       struct drm_fb_helper *fb_helper)
 209 {
 210         struct drm_framebuffer *fb;
 211
 212         /* release drm framebuffer and real buffer */
 213         if (fb_helper->fb && fb_helper->fb->funcs) {
 214                 fb = fb_helper->fb;
 215                 if (fb)
 216                         drm_framebuffer_remove(fb);
 217         }
 218
 219         drm_fb_helper_unregister_fbi(fb_helper);
 220
 221         drm_fb_helper_fini(fb_helper);
 222 }
 223
 224 void exynos_drm_fbdev_fini(struct drm_device *dev)
 225 {
 226         struct exynos_drm_private *private = dev->dev_private;
 227         struct exynos_drm_fbdev *fbdev;
 228
 229         if (!private || !private->fb_helper)
 230                 return;
 231
 232         fbdev = to_exynos_fbdev(private->fb_helper);
 233
 234         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 235         kfree(fbdev);
 236         private->fb_helper = NULL;
 237 }
 238