drivers/gpu/drm/exynos/exynos_drm_fbdev.c

   1 /* exynos_drm_fbdev.c
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authors:
   5  *      Inki Dae <inki.dae@samsung.com>
   6  *      Joonyoung Shim <jy0922.shim@samsung.com>
   7  *      Seung-Woo Kim <sw0312.kim@samsung.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <drm/drmP.h>
  16 #include <drm/drm_crtc.h>
  17 #include <drm/drm_fb_helper.h>
  18 #include <drm/drm_probe_helper.h>
  19 #include <drm/exynos_drm.h>
  20
  21 #include <linux/console.h>
  22
  23 #include "exynos_drm_drv.h"
  24 #include "exynos_drm_fb.h"
  25 #include "exynos_drm_fbdev.h"
  26
  27 #define MAX_CONNECTOR           4
  28 #define PREFERRED_BPP           32
  29
  30 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  31                                 drm_fb_helper)
  32
  33 struct exynos_drm_fbdev {
  34         struct drm_fb_helper    drm_fb_helper;
  35         struct exynos_drm_gem   *exynos_gem;
  36 };
  37
  38 static int exynos_drm_fb_mmap(struct fb_info *info,
  39                         struct vm_area_struct *vma)
  40 {
  41         struct drm_fb_helper *helper = info->par;
  42         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  43         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
  44         unsigned long vm_size;
  45         int ret;
  46
  47         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  48
  49         vm_size = vma->vm_end - vma->vm_start;
  50
  51         if (vm_size > exynos_gem->size)
  52                 return -EINVAL;
  53
  54         ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
  55                              exynos_gem->dma_addr, exynos_gem->size,
  56                              exynos_gem->dma_attrs);
  57         if (ret < 0) {
  58                 DRM_ERROR("failed to mmap.\n");
  59                 return ret;
  60         }
  61
  62         return 0;
  63 }
  64
  65 static struct fb_ops exynos_drm_fb_ops = {
  66         .owner          = THIS_MODULE,
  67         DRM_FB_HELPER_DEFAULT_OPS,
  68         .fb_mmap        = exynos_drm_fb_mmap,
  69         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  70         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  71         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  72 };
  73
  74 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  75                                    struct drm_fb_helper_surface_size *sizes,
  76                                    struct exynos_drm_gem *exynos_gem)
  77 {
  78         struct fb_info *fbi;
  79         struct drm_framebuffer *fb = helper->fb;
  80         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  81         unsigned int nr_pages;
  82         unsigned long offset;
  83
  84         fbi = drm_fb_helper_alloc_fbi(helper);
  85         if (IS_ERR(fbi)) {
  86                 DRM_ERROR("failed to allocate fb info.\n");
  87                 return PTR_ERR(fbi);
  88         }
  89
  90         fbi->par = helper;
  91         fbi->fbops = &exynos_drm_fb_ops;
  92
  93         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
  94         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  95
  96         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  97
  98         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
  99                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 100         if (!exynos_gem->kvaddr) {
 101                 DRM_ERROR("failed to map pages to kernel space.\n");
 102                 return -EIO;
 103         }
 104
 105         offset = fbi->var.xoffset * fb->format->cpp[0];
 106         offset += fbi->var.yoffset * fb->pitches[0];
 107
 108         fbi->screen_base = exynos_gem->kvaddr + offset;
 109         fbi->screen_size = size;
 110         fbi->fix.smem_len = size;
 111
 112         return 0;
 113 }
 114
 115 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 116                                     struct drm_fb_helper_surface_size *sizes)
 117 {
 118         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 119         struct exynos_drm_gem *exynos_gem;
 120         struct drm_device *dev = helper->dev;
 121         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 122         unsigned long size;
 123         int ret;
 124
 125         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 126                         sizes->surface_width, sizes->surface_height,
 127                         sizes->surface_bpp);
 128
 129         mode_cmd.width = sizes->surface_width;
 130         mode_cmd.height = sizes->surface_height;
 131         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 132         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 133                                                           sizes->surface_depth);
 134
 135         size = mode_cmd.pitches[0] * mode_cmd.height;
 136
 137         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 138         /*
 139          * If physically contiguous memory allocation fails and if IOMMU is
 140          * supported then try to get buffer from non physically contiguous
 141          * memory area.
 142          */
 143         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 144                 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 145                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 146                                                    size);
 147         }
 148
 149         if (IS_ERR(exynos_gem))
 150                 return PTR_ERR(exynos_gem);
 151
 152         exynos_fbdev->exynos_gem = exynos_gem;
 153
 154         helper->fb =
 155                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 156         if (IS_ERR(helper->fb)) {
 157                 DRM_ERROR("failed to create drm framebuffer.\n");
 158                 ret = PTR_ERR(helper->fb);
 159                 goto err_destroy_gem;
 160         }
 161
 162         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 163         if (ret < 0)
 164                 goto err_destroy_framebuffer;
 165
 166         return ret;
 167
 168 err_destroy_framebuffer:
 169         drm_framebuffer_cleanup(helper->fb);
 170 err_destroy_gem:
 171         exynos_drm_gem_destroy(exynos_gem);
 172
 173         /*
 174          * if failed, all resources allocated above would be released by
 175          * drm_mode_config_cleanup() when drm_load() had been called prior
 176          * to any specific driver such as fimd or hdmi driver.
 177          */
 178
 179         return ret;
 180 }
 181
 182 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 183         .fb_probe =     exynos_drm_fbdev_create,
 184 };
 185
 186 int exynos_drm_fbdev_init(struct drm_device *dev)
 187 {
 188         struct exynos_drm_fbdev *fbdev;
 189         struct exynos_drm_private *private = dev->dev_private;
 190         struct drm_fb_helper *helper;
 191         int ret;
 192
 193         if (!dev->mode_config.num_crtc)
 194                 return 0;
 195
 196         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 197         if (!fbdev)
 198                 return -ENOMEM;
 199
 200         private->fb_helper = helper = &fbdev->drm_fb_helper;
 201
 202         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 203
 204         ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
 205         if (ret < 0) {
 206                 DRM_ERROR("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_ERROR("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_ERROR("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