drivers/gpu/drm/tegra/fbdev.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012-2013 Avionic Design GmbH
   4  * Copyright (C) 2012 NVIDIA CORPORATION.  All rights reserved.
   5  *
   6  * Based on the KMS/FB DMA helpers
   7  *   Copyright (C) 2012 Analog Devices Inc.
   8  */
   9
  10 #include <linux/console.h>
  11 #include <linux/vmalloc.h>
  12
  13 #include <drm/drm_drv.h>
  14 #include <drm/drm_crtc_helper.h>
  15 #include <drm/drm_fb_helper.h>
  16 #include <drm/drm_fourcc.h>
  17 #include <drm/drm_framebuffer.h>
  18 #include <drm/drm_gem_framebuffer_helper.h>
  19 #include <drm/drm_modeset_helper.h>
  20
  21 #include "drm.h"
  22 #include "gem.h"
  23
  24 static int tegra_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
  25 {
  26         struct drm_fb_helper *helper = info->par;
  27         struct tegra_bo *bo;
  28         int err;
  29
  30         bo = tegra_fb_get_plane(helper->fb, 0);
  31
  32         err = drm_gem_mmap_obj(&bo->gem, bo->gem.size, vma);
  33         if (err < 0)
  34                 return err;
  35
  36         return __tegra_gem_mmap(&bo->gem, vma);
  37 }
  38
  39 static void tegra_fbdev_fb_destroy(struct fb_info *info)
  40 {
  41         struct drm_fb_helper *helper = info->par;
  42         struct drm_framebuffer *fb = helper->fb;
  43         struct tegra_bo *bo = tegra_fb_get_plane(fb, 0);
  44
  45         drm_fb_helper_fini(helper);
  46
  47         /* Undo the special mapping we made in fbdev probe. */
  48         if (bo->pages) {
  49                 vunmap(bo->vaddr);
  50                 bo->vaddr = NULL;
  51         }
  52         drm_framebuffer_remove(fb);
  53
  54         drm_client_release(&helper->client);
  55         drm_fb_helper_unprepare(helper);
  56         kfree(helper);
  57 }
  58
  59 static const struct fb_ops tegra_fb_ops = {
  60         .owner = THIS_MODULE,
  61         DRM_FB_HELPER_DEFAULT_OPS,
  62         .fb_read = drm_fb_helper_sys_read,
  63         .fb_write = drm_fb_helper_sys_write,
  64         .fb_fillrect = drm_fb_helper_sys_fillrect,
  65         .fb_copyarea = drm_fb_helper_sys_copyarea,
  66         .fb_imageblit = drm_fb_helper_sys_imageblit,
  67         .fb_mmap = tegra_fb_mmap,
  68         .fb_destroy = tegra_fbdev_fb_destroy,
  69 };
  70
  71 static int tegra_fbdev_probe(struct drm_fb_helper *helper,
  72                              struct drm_fb_helper_surface_size *sizes)
  73 {
  74         struct tegra_drm *tegra = helper->dev->dev_private;
  75         struct drm_device *drm = helper->dev;
  76         struct drm_mode_fb_cmd2 cmd = { 0 };
  77         unsigned int bytes_per_pixel;
  78         struct drm_framebuffer *fb;
  79         unsigned long offset;
  80         struct fb_info *info;
  81         struct tegra_bo *bo;
  82         size_t size;
  83         int err;
  84
  85         bytes_per_pixel = DIV_ROUND_UP(sizes->surface_bpp, 8);
  86
  87         cmd.width = sizes->surface_width;
  88         cmd.height = sizes->surface_height;
  89         cmd.pitches[0] = round_up(sizes->surface_width * bytes_per_pixel,
  90                                   tegra->pitch_align);
  91
  92         cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
  93                                                      sizes->surface_depth);
  94
  95         size = cmd.pitches[0] * cmd.height;
  96
  97         bo = tegra_bo_create(drm, size, 0);
  98         if (IS_ERR(bo))
  99                 return PTR_ERR(bo);
 100
 101         info = drm_fb_helper_alloc_info(helper);
 102         if (IS_ERR(info)) {
 103                 dev_err(drm->dev, "failed to allocate framebuffer info\n");
 104                 drm_gem_object_put(&bo->gem);
 105                 return PTR_ERR(info);
 106         }
 107
 108         fb = tegra_fb_alloc(drm, &cmd, &bo, 1);
 109         if (IS_ERR(fb)) {
 110                 err = PTR_ERR(fb);
 111                 dev_err(drm->dev, "failed to allocate DRM framebuffer: %d\n",
 112                         err);
 113                 drm_gem_object_put(&bo->gem);
 114                 return PTR_ERR(fb);
 115         }
 116
 117         helper->fb = fb;
 118         helper->info = info;
 119
 120         info->fbops = &tegra_fb_ops;
 121
 122         drm_fb_helper_fill_info(info, helper, sizes);
 123
 124         offset = info->var.xoffset * bytes_per_pixel +
 125                  info->var.yoffset * fb->pitches[0];
 126
 127         if (bo->pages) {
 128                 bo->vaddr = vmap(bo->pages, bo->num_pages, VM_MAP,
 129                                  pgprot_writecombine(PAGE_KERNEL));
 130                 if (!bo->vaddr) {
 131                         dev_err(drm->dev, "failed to vmap() framebuffer\n");
 132                         err = -ENOMEM;
 133                         goto destroy;
 134                 }
 135         }
 136
 137         info->screen_base = (void __iomem *)bo->vaddr + offset;
 138         info->screen_size = size;
 139         info->fix.smem_start = (unsigned long)(bo->iova + offset);
 140         info->fix.smem_len = size;
 141
 142         return 0;
 143
 144 destroy:
 145         drm_framebuffer_remove(fb);
 146         return err;
 147 }
 148
 149 static const struct drm_fb_helper_funcs tegra_fb_helper_funcs = {
 150         .fb_probe = tegra_fbdev_probe,
 151 };
 152
 153 /*
 154  * struct drm_client
 155  */
 156
 157 static void tegra_fbdev_client_unregister(struct drm_client_dev *client)
 158 {
 159         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 160
 161         if (fb_helper->info) {
 162                 drm_fb_helper_unregister_info(fb_helper);
 163         } else {
 164                 drm_client_release(&fb_helper->client);
 165                 drm_fb_helper_unprepare(fb_helper);
 166                 kfree(fb_helper);
 167         }
 168 }
 169
 170 static int tegra_fbdev_client_restore(struct drm_client_dev *client)
 171 {
 172         drm_fb_helper_lastclose(client->dev);
 173
 174         return 0;
 175 }
 176
 177 static int tegra_fbdev_client_hotplug(struct drm_client_dev *client)
 178 {
 179         struct drm_fb_helper *fb_helper = drm_fb_helper_from_client(client);
 180         struct drm_device *dev = client->dev;
 181         int ret;
 182
 183         if (dev->fb_helper)
 184                 return drm_fb_helper_hotplug_event(dev->fb_helper);
 185
 186         ret = drm_fb_helper_init(dev, fb_helper);
 187         if (ret)
 188                 goto err_drm_err;
 189
 190         if (!drm_drv_uses_atomic_modeset(dev))
 191                 drm_helper_disable_unused_functions(dev);
 192
 193         ret = drm_fb_helper_initial_config(fb_helper);
 194         if (ret)
 195                 goto err_drm_fb_helper_fini;
 196
 197         return 0;
 198
 199 err_drm_fb_helper_fini:
 200         drm_fb_helper_fini(fb_helper);
 201 err_drm_err:
 202         drm_err(dev, "Failed to setup fbdev emulation (ret=%d)\n", ret);
 203         return ret;
 204 }
 205
 206 static const struct drm_client_funcs tegra_fbdev_client_funcs = {
 207         .owner          = THIS_MODULE,
 208         .unregister     = tegra_fbdev_client_unregister,
 209         .restore        = tegra_fbdev_client_restore,
 210         .hotplug        = tegra_fbdev_client_hotplug,
 211 };
 212
 213 void tegra_fbdev_setup(struct drm_device *dev)
 214 {
 215         struct drm_fb_helper *helper;
 216         int ret;
 217
 218         drm_WARN(dev, !dev->registered, "Device has not been registered.\n");
 219         drm_WARN(dev, dev->fb_helper, "fb_helper is already set!\n");
 220
 221         helper = kzalloc(sizeof(*helper), GFP_KERNEL);
 222         if (!helper)
 223                 return;
 224         drm_fb_helper_prepare(dev, helper, 32, &tegra_fb_helper_funcs);
 225
 226         ret = drm_client_init(dev, &helper->client, "fbdev", &tegra_fbdev_client_funcs);
 227         if (ret)
 228                 goto err_drm_client_init;
 229
 230         ret = tegra_fbdev_client_hotplug(&helper->client);
 231         if (ret)
 232                 drm_dbg_kms(dev, "client hotplug ret=%d\n", ret);
 233
 234         drm_client_register(&helper->client);
 235
 236         return;
 237
 238 err_drm_client_init:
 239         drm_fb_helper_unprepare(helper);
 240         kfree(helper);
 241 }