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/fb.h>
  12
  13 #include <drm/drm_crtc_helper.h>
  14 #include <drm/drm_drv.h>
  15 #include <drm/drm_fb_helper.h>
  16 #include <drm/drm_framebuffer.h>
  17 #include <drm/drm_gem_framebuffer_helper.h>
  18 #include <drm/drm_prime.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
  27 static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
  28 {
  29         struct drm_fb_helper *helper = info->par;
  30         struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0);
  31
  32         return drm_gem_prime_mmap(obj, vma);
  33 }
  34
  35 static void exynos_drm_fb_destroy(struct fb_info *info)
  36 {
  37         struct drm_fb_helper *fb_helper = info->par;
  38         struct drm_framebuffer *fb = fb_helper->fb;
  39
  40         drm_fb_helper_fini(fb_helper);
  41
  42         drm_framebuffer_remove(fb);
  43
  44         drm_client_release(&fb_helper->client);
  45         drm_fb_helper_unprepare(fb_helper);
  46         kfree(fb_helper);
  47 }
  48
  49 static const struct fb_ops exynos_drm_fb_ops = {
  50         .owner          = THIS_MODULE,
  51         __FB_DEFAULT_DMAMEM_OPS_RDWR,
  52         DRM_FB_HELPER_DEFAULT_OPS,
  53         __FB_DEFAULT_DMAMEM_OPS_DRAW,
  54         .fb_mmap        = exynos_drm_fb_mmap,
  55         .fb_destroy     = exynos_drm_fb_destroy,
  56 };
  57
  58 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  59                                    struct drm_fb_helper_surface_size *sizes,
  60                                    struct exynos_drm_gem *exynos_gem)
  61 {
  62         struct fb_info *fbi;
  63         struct drm_framebuffer *fb = helper->fb;
  64         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  65         unsigned long offset;
  66
  67         fbi = drm_fb_helper_alloc_info(helper);
  68         if (IS_ERR(fbi)) {
  69                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  70                               "failed to allocate fb info.\n");
  71                 return PTR_ERR(fbi);
  72         }
  73
  74         fbi->fbops = &exynos_drm_fb_ops;
  75
  76         drm_fb_helper_fill_info(fbi, helper, sizes);
  77
  78         offset = fbi->var.xoffset * fb->format->cpp[0];
  79         offset += fbi->var.yoffset * fb->pitches[0];
  80
  81         fbi->flags |= FBINFO_VIRTFB;
  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 const struct drm_fb_helper_funcs exynos_drm_fbdev_helper_funcs = {
  90 };
  91
  92 int exynos_drm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
  93                                         struct drm_fb_helper_surface_size *sizes)
  94 {
  95         struct exynos_drm_gem *exynos_gem;
  96         struct drm_device *dev = helper->dev;
  97         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
  98         unsigned long size;
  99         int ret;
 100
 101         DRM_DEV_DEBUG_KMS(dev->dev,
 102                           "surface width(%d), height(%d) and bpp(%d\n",
 103                           sizes->surface_width, sizes->surface_height,
 104                           sizes->surface_bpp);
 105
 106         mode_cmd.width = sizes->surface_width;
 107         mode_cmd.height = sizes->surface_height;
 108         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 109         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 110                                                           sizes->surface_depth);
 111
 112         size = mode_cmd.pitches[0] * mode_cmd.height;
 113
 114         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_WC, size, true);
 115         if (IS_ERR(exynos_gem))
 116                 return PTR_ERR(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         helper->funcs = &exynos_drm_fbdev_helper_funcs;
 126
 127         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 128         if (ret < 0)
 129                 goto err_destroy_framebuffer;
 130
 131         return 0;
 132
 133 err_destroy_framebuffer:
 134         drm_framebuffer_cleanup(helper->fb);
 135         helper->fb = NULL;
 136 err_destroy_gem:
 137         exynos_drm_gem_destroy(exynos_gem);
 138         return ret;
 139 }