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