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 <[email protected]>
   7  *      Joonyoung Shim <[email protected]>
   8  *      Seung-Woo Kim <[email protected]>
   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_framebuffer.h>
  19 #include <drm/drm_prime.h>
  20 #include <drm/drm_probe_helper.h>
  21 #include <drm/exynos_drm.h>
  22
  23 #include "exynos_drm_drv.h"
  24 #include "exynos_drm_fb.h"
  25 #include "exynos_drm_fbdev.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   *exynos_gem;
  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 *exynos_gem = exynos_fbd->exynos_gem;
  44
  45         return drm_gem_prime_mmap(&exynos_gem->base, vma);
  46 }
  47
  48 static const struct fb_ops exynos_drm_fb_ops = {
  49         .owner          = THIS_MODULE,
  50         DRM_FB_HELPER_DEFAULT_OPS,
  51         .fb_mmap        = exynos_drm_fb_mmap,
  52         .fb_read        = drm_fb_helper_cfb_read,
  53         .fb_write       = drm_fb_helper_cfb_write,
  54         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  55         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  56         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  57 };
  58
  59 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  60                                    struct drm_fb_helper_surface_size *sizes,
  61                                    struct exynos_drm_gem *exynos_gem)
  62 {
  63         struct fb_info *fbi;
  64         struct drm_framebuffer *fb = helper->fb;
  65         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  66         unsigned long offset;
  67
  68         fbi = drm_fb_helper_alloc_info(helper);
  69         if (IS_ERR(fbi)) {
  70                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  71                               "failed to allocate fb info.\n");
  72                 return PTR_ERR(fbi);
  73         }
  74
  75         fbi->fbops = &exynos_drm_fb_ops;
  76
  77         drm_fb_helper_fill_info(fbi, helper, sizes);
  78
  79         offset = fbi->var.xoffset * fb->format->cpp[0];
  80         offset += fbi->var.yoffset * fb->pitches[0];
  81
  82         fbi->screen_buffer = exynos_gem->kvaddr + offset;
  83         fbi->screen_size = size;
  84         fbi->fix.smem_len = size;
  85
  86         return 0;
  87 }
  88
  89 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
  90                                     struct drm_fb_helper_surface_size *sizes)
  91 {
  92         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
  93         struct exynos_drm_gem *exynos_gem;
  94         struct drm_device *dev = helper->dev;
  95         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
  96         unsigned long size;
  97         int ret;
  98
  99         DRM_DEV_DEBUG_KMS(dev->dev,
 100                           "surface width(%d), height(%d) and bpp(%d\n",
 101                           sizes->surface_width, sizes->surface_height,
 102                           sizes->surface_bpp);
 103
 104         mode_cmd.width = sizes->surface_width;
 105         mode_cmd.height = sizes->surface_height;
 106         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 107         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 108                                                           sizes->surface_depth);
 109
 110         size = mode_cmd.pitches[0] * mode_cmd.height;
 111
 112         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
 113         if (IS_ERR(exynos_gem))
 114                 return PTR_ERR(exynos_gem);
 115
 116         exynos_fbdev->exynos_gem = exynos_gem;
 117
 118         helper->fb =
 119                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 120         if (IS_ERR(helper->fb)) {
 121                 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
 122                 ret = PTR_ERR(helper->fb);
 123                 goto err_destroy_gem;
 124         }
 125
 126         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 127         if (ret < 0)
 128                 goto err_destroy_framebuffer;
 129
 130         return ret;
 131
 132 err_destroy_framebuffer:
 133         drm_framebuffer_cleanup(helper->fb);
 134 err_destroy_gem:
 135         exynos_drm_gem_destroy(exynos_gem);
 136
 137         /*
 138          * if failed, all resources allocated above would be released by
 139          * drm_mode_config_cleanup() when drm_load() had been called prior
 140          * to any specific driver such as fimd or hdmi driver.
 141          */
 142
 143         return ret;
 144 }
 145
 146 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 147         .fb_probe =     exynos_drm_fbdev_create,
 148 };
 149
 150 int exynos_drm_fbdev_init(struct drm_device *dev)
 151 {
 152         struct exynos_drm_fbdev *fbdev;
 153         struct exynos_drm_private *private = dev->dev_private;
 154         struct drm_fb_helper *helper;
 155         int ret;
 156
 157         if (!dev->mode_config.num_crtc)
 158                 return 0;
 159
 160         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 161         if (!fbdev)
 162                 return -ENOMEM;
 163
 164         private->fb_helper = helper = &fbdev->drm_fb_helper;
 165
 166         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 167
 168         ret = drm_fb_helper_init(dev, helper);
 169         if (ret < 0) {
 170                 DRM_DEV_ERROR(dev->dev,
 171                               "failed to initialize drm fb helper.\n");
 172                 goto err_init;
 173         }
 174
 175         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 176         if (ret < 0) {
 177                 DRM_DEV_ERROR(dev->dev,
 178                               "failed to set up hw configuration.\n");
 179                 goto err_setup;
 180         }
 181
 182         return 0;
 183
 184 err_setup:
 185         drm_fb_helper_fini(helper);
 186
 187 err_init:
 188         private->fb_helper = NULL;
 189         kfree(fbdev);
 190
 191         return ret;
 192 }
 193
 194 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 195                                       struct drm_fb_helper *fb_helper)
 196 {
 197         struct drm_framebuffer *fb;
 198
 199         /* release drm framebuffer and real buffer */
 200         if (fb_helper->fb && fb_helper->fb->funcs) {
 201                 fb = fb_helper->fb;
 202                 if (fb)
 203                         drm_framebuffer_remove(fb);
 204         }
 205
 206         drm_fb_helper_unregister_info(fb_helper);
 207
 208         drm_fb_helper_fini(fb_helper);
 209 }
 210
 211 void exynos_drm_fbdev_fini(struct drm_device *dev)
 212 {
 213         struct exynos_drm_private *private = dev->dev_private;
 214         struct exynos_drm_fbdev *fbdev;
 215
 216         if (!private || !private->fb_helper)
 217                 return;
 218
 219         fbdev = to_exynos_fbdev(private->fb_helper);
 220
 221         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 222         kfree(fbdev);
 223         private->fb_helper = NULL;
 224 }
 225