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 <drm/drm_crtc_helper.h>
  12 #include <drm/drm_drv.h>
  13 #include <drm/drm_fb_helper.h>
  14 #include <drm/drm_framebuffer.h>
  15 #include <drm/drm_gem_framebuffer_helper.h>
  16 #include <drm/drm_prime.h>
  17 #include <drm/exynos_drm.h>
  18
  19 #include "exynos_drm_drv.h"
  20 #include "exynos_drm_fb.h"
  21 #include "exynos_drm_fbdev.h"
  22
  23 #define MAX_CONNECTOR           4
  24 #define PREFERRED_BPP           32
  25
  26 static int exynos_drm_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
  27 {
  28         struct drm_fb_helper *helper = info->par;
  29         struct drm_gem_object *obj = drm_gem_fb_get_obj(helper->fb, 0);
  30
  31         return drm_gem_prime_mmap(obj, vma);
  32 }
  33
  34 static void exynos_drm_fb_destroy(struct fb_info *info)
  35 {
  36         struct drm_fb_helper *fb_helper = info->par;
  37         struct drm_framebuffer *fb = fb_helper->fb;
  38
  39         drm_fb_helper_fini(fb_helper);
  40
  41         drm_framebuffer_remove(fb);
  42
  43         drm_client_release(&fb_helper->client);
  44         drm_fb_helper_unprepare(fb_helper);
  45         kfree(fb_helper);
  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         .fb_destroy     = exynos_drm_fb_destroy,
  58 };
  59
  60 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  61                                    struct drm_fb_helper_surface_size *sizes,
  62                                    struct exynos_drm_gem *exynos_gem)
  63 {
  64         struct fb_info *fbi;
  65         struct drm_framebuffer *fb = helper->fb;
  66         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  67         unsigned long offset;
  68
  69         fbi = drm_fb_helper_alloc_info(helper);
  70         if (IS_ERR(fbi)) {
  71                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  72                               "failed to allocate fb info.\n");
  73                 return PTR_ERR(fbi);
  74         }
  75
  76         fbi->fbops = &exynos_drm_fb_ops;
  77
  78         drm_fb_helper_fill_info(fbi, helper, sizes);
  79
  80         offset = fbi->var.xoffset * fb->format->cpp[0];
  81         offset += fbi->var.yoffset * fb->pitches[0];
  82
  83         fbi->screen_buffer = exynos_gem->kvaddr + offset;
  84         fbi->screen_size = size;
  85         fbi->fix.smem_len = size;
  86
  87         return 0;
  88 }
  89
  90 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
  91                                     struct drm_fb_helper_surface_size *sizes)
  92 {
  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         helper->fb =
 117                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 118         if (IS_ERR(helper->fb)) {
 119                 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
 120                 ret = PTR_ERR(helper->fb);
 121                 goto err_destroy_gem;
 122         }
 123
 124         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 125         if (ret < 0)
 126                 goto err_destroy_framebuffer;
 127
 128         return 0;
 129
 130 err_destroy_framebuffer:
 131         drm_framebuffer_cleanup(helper->fb);
 132         helper->fb = NULL;
 133 err_destroy_gem:
 134         exynos_drm_gem_destroy(exynos_gem);
 135         return ret;
 136 }
 137
 138 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 139         .fb_probe =     exynos_drm_fbdev_create,
 140 };
 141
 142 /*
 143  * struct drm_client
 144  */
 145
 146 static void exynos_drm_fbdev_client_unregister(struct drm_client_dev *client)
 147 {
 148         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 149
 150         if (fb_helper->info) {
 151                 drm_fb_helper_unregister_info(fb_helper);
 152         } else {
 153                 drm_client_release(&fb_helper->client);
 154                 drm_fb_helper_unprepare(fb_helper);
 155                 kfree(fb_helper);
 156         }
 157 }
 158
 159 static int exynos_drm_fbdev_client_restore(struct drm_client_dev *client)
 160 {
 161         drm_fb_helper_lastclose(client->dev);
 162
 163         return 0;
 164 }
 165
 166 static int exynos_drm_fbdev_client_hotplug(struct drm_client_dev *client)
 167 {
 168         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 169         struct drm_device *dev = client->dev;
 170         int ret;
 171
 172         if (dev->fb_helper)
 173                 return drm_fb_helper_hotplug_event(dev->fb_helper);
 174
 175         ret = drm_fb_helper_init(dev, fb_helper);
 176         if (ret)
 177                 goto err_drm_err;
 178
 179         if (!drm_drv_uses_atomic_modeset(dev))
 180                 drm_helper_disable_unused_functions(dev);
 181
 182         ret = drm_fb_helper_initial_config(fb_helper);
 183         if (ret)
 184                 goto err_drm_fb_helper_fini;
 185
 186         return 0;
 187
 188 err_drm_fb_helper_fini:
 189         drm_fb_helper_fini(fb_helper);
 190 err_drm_err:
 191         drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
 192         return ret;
 193 }
 194
 195 static const struct drm_client_funcs exynos_drm_fbdev_client_funcs = {
 196         .owner          = THIS_MODULE,
 197         .unregister     = exynos_drm_fbdev_client_unregister,
 198         .restore        = exynos_drm_fbdev_client_restore,
 199         .hotplug        = exynos_drm_fbdev_client_hotplug,
 200 };
 201
 202 void exynos_drm_fbdev_setup(struct drm_device *dev)
 203 {
 204         struct drm_fb_helper *fb_helper;
 205         int ret;
 206
 207         drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
 208         drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
 209
 210         fb_helper = kzalloc(sizeof(*fb_helper), GFP_KERNEL);
 211         if (!fb_helper)
 212                 return;
 213         drm_fb_helper_prepare(dev, fb_helper, PREFERRED_BPP, &exynos_drm_fb_helper_funcs);
 214
 215         ret = drm_client_init(dev, &fb_helper->client, "fbdev", &exynos_drm_fbdev_client_funcs);
 216         if (ret)
 217                 goto err_drm_client_init;
 218
 219         ret = exynos_drm_fbdev_client_hotplug(&fb_helper->client);
 220         if (ret)
 221                 drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
 222
 223         drm_client_register(&fb_helper->client);
 224
 225         return;
 226
 227 err_drm_client_init:
 228         drm_fb_helper_unprepare(fb_helper);
 229         kfree(fb_helper);
 230 }