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
  14 #include <drm/drm_crtc.h>
  15 #include <drm/drm_fb_helper.h>
  16 #include <drm/drm_fourcc.h>
  17 #include <drm/drm_probe_helper.h>
  18 #include <drm/exynos_drm.h>
  19
  20 #include "exynos_drm_drv.h"
  21 #include "exynos_drm_fb.h"
  22 #include "exynos_drm_fbdev.h"
  23
  24 #define MAX_CONNECTOR           4
  25 #define PREFERRED_BPP           32
  26
  27 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  28                                 drm_fb_helper)
  29
  30 struct exynos_drm_fbdev {
  31         struct drm_fb_helper    drm_fb_helper;
  32         struct exynos_drm_gem   *exynos_gem;
  33 };
  34
  35 static int exynos_drm_fb_mmap(struct fb_info *info,
  36                         struct vm_area_struct *vma)
  37 {
  38         struct drm_fb_helper *helper = info->par;
  39         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  40         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
  41         unsigned long vm_size;
  42         int ret;
  43
  44         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  45
  46         vm_size = vma->vm_end - vma->vm_start;
  47
  48         if (vm_size > exynos_gem->size)
  49                 return -EINVAL;
  50
  51         ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
  52                              exynos_gem->dma_addr, exynos_gem->size,
  53                              exynos_gem->dma_attrs);
  54         if (ret < 0) {
  55                 DRM_DEV_ERROR(to_dma_dev(helper->dev), "failed to mmap.\n");
  56                 return ret;
  57         }
  58
  59         return 0;
  60 }
  61
  62 static struct fb_ops exynos_drm_fb_ops = {
  63         .owner          = THIS_MODULE,
  64         DRM_FB_HELPER_DEFAULT_OPS,
  65         .fb_mmap        = exynos_drm_fb_mmap,
  66         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  67         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  68         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  69 };
  70
  71 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  72                                    struct drm_fb_helper_surface_size *sizes,
  73                                    struct exynos_drm_gem *exynos_gem)
  74 {
  75         struct fb_info *fbi;
  76         struct drm_framebuffer *fb = helper->fb;
  77         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  78         unsigned int nr_pages;
  79         unsigned long offset;
  80
  81         fbi = drm_fb_helper_alloc_fbi(helper);
  82         if (IS_ERR(fbi)) {
  83                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  84                               "failed to allocate fb info.\n");
  85                 return PTR_ERR(fbi);
  86         }
  87
  88         fbi->fbops = &exynos_drm_fb_ops;
  89
  90         drm_fb_helper_fill_info(fbi, helper, sizes);
  91
  92         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  93
  94         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
  95                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
  96         if (!exynos_gem->kvaddr) {
  97                 DRM_DEV_ERROR(to_dma_dev(helper->dev),
  98                               "failed to map pages to kernel space.\n");
  99                 return -EIO;
 100         }
 101
 102         offset = fbi->var.xoffset * fb->format->cpp[0];
 103         offset += fbi->var.yoffset * fb->pitches[0];
 104
 105         fbi->screen_base = exynos_gem->kvaddr + offset;
 106         fbi->screen_size = size;
 107         fbi->fix.smem_len = size;
 108
 109         return 0;
 110 }
 111
 112 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 113                                     struct drm_fb_helper_surface_size *sizes)
 114 {
 115         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 116         struct exynos_drm_gem *exynos_gem;
 117         struct drm_device *dev = helper->dev;
 118         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 119         unsigned long size;
 120         int ret;
 121
 122         DRM_DEV_DEBUG_KMS(dev->dev,
 123                           "surface width(%d), height(%d) and bpp(%d\n",
 124                           sizes->surface_width, sizes->surface_height,
 125                           sizes->surface_bpp);
 126
 127         mode_cmd.width = sizes->surface_width;
 128         mode_cmd.height = sizes->surface_height;
 129         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 130         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 131                                                           sizes->surface_depth);
 132
 133         size = mode_cmd.pitches[0] * mode_cmd.height;
 134
 135         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 136         /*
 137          * If physically contiguous memory allocation fails and if IOMMU is
 138          * supported then try to get buffer from non physically contiguous
 139          * memory area.
 140          */
 141         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 142                 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 143                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 144                                                    size);
 145         }
 146
 147         if (IS_ERR(exynos_gem))
 148                 return PTR_ERR(exynos_gem);
 149
 150         exynos_fbdev->exynos_gem = exynos_gem;
 151
 152         helper->fb =
 153                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 154         if (IS_ERR(helper->fb)) {
 155                 DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
 156                 ret = PTR_ERR(helper->fb);
 157                 goto err_destroy_gem;
 158         }
 159
 160         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 161         if (ret < 0)
 162                 goto err_destroy_framebuffer;
 163
 164         return ret;
 165
 166 err_destroy_framebuffer:
 167         drm_framebuffer_cleanup(helper->fb);
 168 err_destroy_gem:
 169         exynos_drm_gem_destroy(exynos_gem);
 170
 171         /*
 172          * if failed, all resources allocated above would be released by
 173          * drm_mode_config_cleanup() when drm_load() had been called prior
 174          * to any specific driver such as fimd or hdmi driver.
 175          */
 176
 177         return ret;
 178 }
 179
 180 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 181         .fb_probe =     exynos_drm_fbdev_create,
 182 };
 183
 184 int exynos_drm_fbdev_init(struct drm_device *dev)
 185 {
 186         struct exynos_drm_fbdev *fbdev;
 187         struct exynos_drm_private *private = dev->dev_private;
 188         struct drm_fb_helper *helper;
 189         int ret;
 190
 191         if (!dev->mode_config.num_crtc)
 192                 return 0;
 193
 194         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 195         if (!fbdev)
 196                 return -ENOMEM;
 197
 198         private->fb_helper = helper = &fbdev->drm_fb_helper;
 199
 200         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 201
 202         ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
 203         if (ret < 0) {
 204                 DRM_DEV_ERROR(dev->dev,
 205                               "failed to initialize drm fb helper.\n");
 206                 goto err_init;
 207         }
 208
 209         ret = drm_fb_helper_single_add_all_connectors(helper);
 210         if (ret < 0) {
 211                 DRM_DEV_ERROR(dev->dev,
 212                               "failed to register drm_fb_helper_connector.\n");
 213                 goto err_setup;
 214
 215         }
 216
 217         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 218         if (ret < 0) {
 219                 DRM_DEV_ERROR(dev->dev,
 220                               "failed to set up hw configuration.\n");
 221                 goto err_setup;
 222         }
 223
 224         return 0;
 225
 226 err_setup:
 227         drm_fb_helper_fini(helper);
 228
 229 err_init:
 230         private->fb_helper = NULL;
 231         kfree(fbdev);
 232
 233         return ret;
 234 }
 235
 236 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 237                                       struct drm_fb_helper *fb_helper)
 238 {
 239         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 240         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
 241         struct drm_framebuffer *fb;
 242
 243         vunmap(exynos_gem->kvaddr);
 244
 245         /* release drm framebuffer and real buffer */
 246         if (fb_helper->fb && fb_helper->fb->funcs) {
 247                 fb = fb_helper->fb;
 248                 if (fb)
 249                         drm_framebuffer_remove(fb);
 250         }
 251
 252         drm_fb_helper_unregister_fbi(fb_helper);
 253
 254         drm_fb_helper_fini(fb_helper);
 255 }
 256
 257 void exynos_drm_fbdev_fini(struct drm_device *dev)
 258 {
 259         struct exynos_drm_private *private = dev->dev_private;
 260         struct exynos_drm_fbdev *fbdev;
 261
 262         if (!private || !private->fb_helper)
 263                 return;
 264
 265         fbdev = to_exynos_fbdev(private->fb_helper);
 266
 267         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 268         kfree(fbdev);
 269         private->fb_helper = NULL;
 270 }
 271