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 <drm/drmP.h>
  12 #include <drm/drm_crtc.h>
  13 #include <drm/drm_fb_helper.h>
  14 #include <drm/drm_probe_helper.h>
  15 #include <drm/exynos_drm.h>
  16
  17 #include <linux/console.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 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  27                                 drm_fb_helper)
  28
  29 struct exynos_drm_fbdev {
  30         struct drm_fb_helper    drm_fb_helper;
  31         struct exynos_drm_gem   *exynos_gem;
  32 };
  33
  34 static int exynos_drm_fb_mmap(struct fb_info *info,
  35                         struct vm_area_struct *vma)
  36 {
  37         struct drm_fb_helper *helper = info->par;
  38         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  39         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
  40         unsigned long vm_size;
  41         int ret;
  42
  43         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  44
  45         vm_size = vma->vm_end - vma->vm_start;
  46
  47         if (vm_size > exynos_gem->size)
  48                 return -EINVAL;
  49
  50         ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
  51                              exynos_gem->dma_addr, exynos_gem->size,
  52                              exynos_gem->dma_attrs);
  53         if (ret < 0) {
  54                 DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
  55                 return ret;
  56         }
  57
  58         return 0;
  59 }
  60
  61 static struct fb_ops exynos_drm_fb_ops = {
  62         .owner          = THIS_MODULE,
  63         DRM_FB_HELPER_DEFAULT_OPS,
  64         .fb_mmap        = exynos_drm_fb_mmap,
  65         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  66         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  67         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  68 };
  69
  70 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  71                                    struct drm_fb_helper_surface_size *sizes,
  72                                    struct exynos_drm_gem *exynos_gem)
  73 {
  74         struct fb_info *fbi;
  75         struct drm_framebuffer *fb = helper->fb;
  76         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  77         unsigned int nr_pages;
  78         unsigned long offset;
  79
  80         fbi = drm_fb_helper_alloc_fbi(helper);
  81         if (IS_ERR(fbi)) {
  82                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  83                               "failed to allocate fb info.\n");
  84                 return PTR_ERR(fbi);
  85         }
  86
  87         fbi->fbops = &exynos_drm_fb_ops;
  88
  89         drm_fb_helper_fill_info(fbi, helper, sizes);
  90
  91         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  92
  93         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
  94                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
  95         if (!exynos_gem->kvaddr) {
  96                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  97                               "failed to map pages to kernel space.\n");
  98                 return -EIO;
  99         }
 100
 101         offset = fbi->var.xoffset * fb->format->cpp[0];
 102         offset += fbi->var.yoffset * fb->pitches[0];
 103
 104         fbi->screen_base = exynos_gem->kvaddr + offset;
 105         fbi->screen_size = size;
 106         fbi->fix.smem_len = size;
 107
 108         return 0;
 109 }
 110
 111 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 112                                     struct drm_fb_helper_surface_size *sizes)
 113 {
 114         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 115         struct exynos_drm_gem *exynos_gem;
 116         struct drm_device *dev = helper->dev;
 117         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 118         unsigned long size;
 119         int ret;
 120
 121         DRM_DEV_DEBUG_KMS(dev->dev,
 122                           "surface width(%d), height(%d) and bpp(%d\n",
 123                           sizes->surface_width, sizes->surface_height,
 124                           sizes->surface_bpp);
 125
 126         mode_cmd.width = sizes->surface_width;
 127         mode_cmd.height = sizes->surface_height;
 128         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 129         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 130                                                           sizes->surface_depth);
 131
 132         size = mode_cmd.pitches[0] * mode_cmd.height;
 133
 134         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 135         /*
 136          * If physically contiguous memory allocation fails and if IOMMU is
 137          * supported then try to get buffer from non physically contiguous
 138          * memory area.
 139          */
 140         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 141                 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 142                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 143                                                    size);
 144         }
 145
 146         if (IS_ERR(exynos_gem))
 147                 return PTR_ERR(exynos_gem);
 148
 149         exynos_fbdev->exynos_gem = exynos_gem;
 150
 151         helper->fb =
 152                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 153         if (IS_ERR(helper->fb)) {
 154                 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
 155                 ret = PTR_ERR(helper->fb);
 156                 goto err_destroy_gem;
 157         }
 158
 159         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 160         if (ret < 0)
 161                 goto err_destroy_framebuffer;
 162
 163         return ret;
 164
 165 err_destroy_framebuffer:
 166         drm_framebuffer_cleanup(helper->fb);
 167 err_destroy_gem:
 168         exynos_drm_gem_destroy(exynos_gem);
 169
 170         /*
 171          * if failed, all resources allocated above would be released by
 172          * drm_mode_config_cleanup() when drm_load() had been called prior
 173          * to any specific driver such as fimd or hdmi driver.
 174          */
 175
 176         return ret;
 177 }
 178
 179 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 180         .fb_probe =     exynos_drm_fbdev_create,
 181 };
 182
 183 int exynos_drm_fbdev_init(struct drm_device *dev)
 184 {
 185         struct exynos_drm_fbdev *fbdev;
 186         struct exynos_drm_private *private = dev->dev_private;
 187         struct drm_fb_helper *helper;
 188         int ret;
 189
 190         if (!dev->mode_config.num_crtc)
 191                 return 0;
 192
 193         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 194         if (!fbdev)
 195                 return -ENOMEM;
 196
 197         private->fb_helper = helper = &fbdev->drm_fb_helper;
 198
 199         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 200
 201         ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
 202         if (ret < 0) {
 203                 DRM_DEV_ERROR(dev->dev,
 204                               "failed to initialize drm fb helper.\n");
 205                 goto err_init;
 206         }
 207
 208         ret = drm_fb_helper_single_add_all_connectors(helper);
 209         if (ret < 0) {
 210                 DRM_DEV_ERROR(dev->dev,
 211                               "failed to register drm_fb_helper_connector.\n");
 212                 goto err_setup;
 213
 214         }
 215
 216         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 217         if (ret < 0) {
 218                 DRM_DEV_ERROR(dev->dev,
 219                               "failed to set up hw configuration.\n");
 220                 goto err_setup;
 221         }
 222
 223         return 0;
 224
 225 err_setup:
 226         drm_fb_helper_fini(helper);
 227
 228 err_init:
 229         private->fb_helper = NULL;
 230         kfree(fbdev);
 231
 232         return ret;
 233 }
 234
 235 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 236                                       struct drm_fb_helper *fb_helper)
 237 {
 238         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 239         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 240         struct drm_framebuffer *fb;
 241
 242         vunmap(exynos_gem->kvaddr);
 243
 244         /* release drm framebuffer and real buffer */
 245         if (fb_helper->fb && fb_helper->fb->funcs) {
 246                 fb = fb_helper->fb;
 247                 if (fb)
 248                         drm_framebuffer_remove(fb);
 249         }
 250
 251         drm_fb_helper_unregister_fbi(fb_helper);
 252
 253         drm_fb_helper_fini(fb_helper);
 254 }
 255
 256 void exynos_drm_fbdev_fini(struct drm_device *dev)
 257 {
 258         struct exynos_drm_private *private = dev->dev_private;
 259         struct exynos_drm_fbdev *fbdev;
 260
 261         if (!private || !private->fb_helper)
 262                 return;
 263
 264         fbdev = to_exynos_fbdev(private->fb_helper);
 265
 266         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 267         kfree(fbdev);
 268         private->fb_helper = NULL;
 269 }
 270