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_probe_helper.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 #define PREFERRED_BPP           32
  27
  28 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  29                                 drm_fb_helper)
  30
  31 struct exynos_drm_fbdev {
  32         struct drm_fb_helper    drm_fb_helper;
  33         struct exynos_drm_gem   *exynos_gem;
  34 };
  35
  36 static int exynos_drm_fb_mmap(struct fb_info *info,
  37                         struct vm_area_struct *vma)
  38 {
  39         struct drm_fb_helper *helper = info->par;
  40         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  41         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
  42         unsigned long vm_size;
  43         int ret;
  44
  45         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  46
  47         vm_size = vma->vm_end - vma->vm_start;
  48
  49         if (vm_size > exynos_gem->size)
  50                 return -EINVAL;
  51
  52         ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
  53                              exynos_gem->dma_addr, exynos_gem->size,
  54                              exynos_gem->dma_attrs);
  55         if (ret < 0) {
  56                 DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
  57                 return ret;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static const struct fb_ops exynos_drm_fb_ops = {
  64         .owner          = THIS_MODULE,
  65         DRM_FB_HELPER_DEFAULT_OPS,
  66         .fb_mmap        = exynos_drm_fb_mmap,
  67         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  68         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  69         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  70 };
  71
  72 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  73                                    struct drm_fb_helper_surface_size *sizes,
  74                                    struct exynos_drm_gem *exynos_gem)
  75 {
  76         struct fb_info *fbi;
  77         struct drm_framebuffer *fb = helper->fb;
  78         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  79         unsigned int nr_pages;
  80         unsigned long offset;
  81
  82         fbi = drm_fb_helper_alloc_fbi(helper);
  83         if (IS_ERR(fbi)) {
  84                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  85                               "failed to allocate fb info.\n");
  86                 return PTR_ERR(fbi);
  87         }
  88
  89         fbi->fbops = &exynos_drm_fb_ops;
  90
  91         drm_fb_helper_fill_info(fbi, helper, sizes);
  92
  93         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  94
  95         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
  96                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
  97         if (!exynos_gem->kvaddr) {
  98                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  99                               "failed to map pages to kernel space.\n");
 100                 return -EIO;
 101         }
 102
 103         offset = fbi->var.xoffset * fb->format->cpp[0];
 104         offset += fbi->var.yoffset * fb->pitches[0];
 105
 106         fbi->screen_base = exynos_gem->kvaddr + offset;
 107         fbi->screen_size = size;
 108         fbi->fix.smem_len = size;
 109
 110         return 0;
 111 }
 112
 113 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 114                                     struct drm_fb_helper_surface_size *sizes)
 115 {
 116         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 117         struct exynos_drm_gem *exynos_gem;
 118         struct drm_device *dev = helper->dev;
 119         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 120         unsigned long size;
 121         int ret;
 122
 123         DRM_DEV_DEBUG_KMS(dev->dev,
 124                           "surface width(%d), height(%d) and bpp(%d\n",
 125                           sizes->surface_width, sizes->surface_height,
 126                           sizes->surface_bpp);
 127
 128         mode_cmd.width = sizes->surface_width;
 129         mode_cmd.height = sizes->surface_height;
 130         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 131         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 132                                                           sizes->surface_depth);
 133
 134         size = mode_cmd.pitches[0] * mode_cmd.height;
 135
 136         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 137         /*
 138          * If physically contiguous memory allocation fails and if IOMMU is
 139          * supported then try to get buffer from non physically contiguous
 140          * memory area.
 141          */
 142         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 143                 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 144                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 145                                                    size);
 146         }
 147
 148         if (IS_ERR(exynos_gem))
 149                 return PTR_ERR(exynos_gem);
 150
 151         exynos_fbdev->exynos_gem = exynos_gem;
 152
 153         helper->fb =
 154                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 155         if (IS_ERR(helper->fb)) {
 156                 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
 157                 ret = PTR_ERR(helper->fb);
 158                 goto err_destroy_gem;
 159         }
 160
 161         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 162         if (ret < 0)
 163                 goto err_destroy_framebuffer;
 164
 165         return ret;
 166
 167 err_destroy_framebuffer:
 168         drm_framebuffer_cleanup(helper->fb);
 169 err_destroy_gem:
 170         exynos_drm_gem_destroy(exynos_gem);
 171
 172         /*
 173          * if failed, all resources allocated above would be released by
 174          * drm_mode_config_cleanup() when drm_load() had been called prior
 175          * to any specific driver such as fimd or hdmi driver.
 176          */
 177
 178         return ret;
 179 }
 180
 181 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 182         .fb_probe =     exynos_drm_fbdev_create,
 183 };
 184
 185 int exynos_drm_fbdev_init(struct drm_device *dev)
 186 {
 187         struct exynos_drm_fbdev *fbdev;
 188         struct exynos_drm_private *private = dev->dev_private;
 189         struct drm_fb_helper *helper;
 190         int ret;
 191
 192         if (!dev->mode_config.num_crtc)
 193                 return 0;
 194
 195         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 196         if (!fbdev)
 197                 return -ENOMEM;
 198
 199         private->fb_helper = helper = &fbdev->drm_fb_helper;
 200
 201         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 202
 203         ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
 204         if (ret < 0) {
 205                 DRM_DEV_ERROR(dev->dev,
 206                               "failed to initialize drm fb helper.\n");
 207                 goto err_init;
 208         }
 209
 210         ret = drm_fb_helper_single_add_all_connectors(helper);
 211         if (ret < 0) {
 212                 DRM_DEV_ERROR(dev->dev,
 213                               "failed to register drm_fb_helper_connector.\n");
 214                 goto err_setup;
 215
 216         }
 217
 218         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 219         if (ret < 0) {
 220                 DRM_DEV_ERROR(dev->dev,
 221                               "failed to set up hw configuration.\n");
 222                 goto err_setup;
 223         }
 224
 225         return 0;
 226
 227 err_setup:
 228         drm_fb_helper_fini(helper);
 229
 230 err_init:
 231         private->fb_helper = NULL;
 232         kfree(fbdev);
 233
 234         return ret;
 235 }
 236
 237 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 238                                       struct drm_fb_helper *fb_helper)
 239 {
 240         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 241         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 242         struct drm_framebuffer *fb;
 243
 244         vunmap(exynos_gem->kvaddr);
 245
 246         /* release drm framebuffer and real buffer */
 247         if (fb_helper->fb && fb_helper->fb->funcs) {
 248                 fb = fb_helper->fb;
 249                 if (fb)
 250                         drm_framebuffer_remove(fb);
 251         }
 252
 253         drm_fb_helper_unregister_fbi(fb_helper);
 254
 255         drm_fb_helper_fini(fb_helper);
 256 }
 257
 258 void exynos_drm_fbdev_fini(struct drm_device *dev)
 259 {
 260         struct exynos_drm_private *private = dev->dev_private;
 261         struct exynos_drm_fbdev *fbdev;
 262
 263         if (!private || !private->fb_helper)
 264                 return;
 265
 266         fbdev = to_exynos_fbdev(private->fb_helper);
 267
 268         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 269         kfree(fbdev);
 270         private->fb_helper = NULL;
 271 }
 272