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_crtc_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->flags = FBINFO_FLAG_DEFAULT;
  92         fbi->fbops = &exynos_drm_fb_ops;
  93
  94         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
  95         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  96
  97         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  98
  99         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
 100                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 101         if (!exynos_gem->kvaddr) {
 102                 DRM_ERROR("failed to map pages to kernel space.\n");
 103                 return -EIO;
 104         }
 105
 106         offset = fbi->var.xoffset * fb->format->cpp[0];
 107         offset += fbi->var.yoffset * fb->pitches[0];
 108
 109         fbi->screen_base = exynos_gem->kvaddr + offset;
 110         fbi->screen_size = size;
 111         fbi->fix.smem_len = size;
 112
 113         return 0;
 114 }
 115
 116 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 117                                     struct drm_fb_helper_surface_size *sizes)
 118 {
 119         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 120         struct exynos_drm_gem *exynos_gem;
 121         struct drm_device *dev = helper->dev;
 122         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 123         unsigned long size;
 124         int ret;
 125
 126         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 127                         sizes->surface_width, sizes->surface_height,
 128                         sizes->surface_bpp);
 129
 130         mode_cmd.width = sizes->surface_width;
 131         mode_cmd.height = sizes->surface_height;
 132         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 133         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 134                                                           sizes->surface_depth);
 135
 136         size = mode_cmd.pitches[0] * mode_cmd.height;
 137
 138         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 139         /*
 140          * If physically contiguous memory allocation fails and if IOMMU is
 141          * supported then try to get buffer from non physically contiguous
 142          * memory area.
 143          */
 144         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 145                 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 146                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 147                                                    size);
 148         }
 149
 150         if (IS_ERR(exynos_gem))
 151                 return PTR_ERR(exynos_gem);
 152
 153         exynos_fbdev->exynos_gem = exynos_gem;
 154
 155         helper->fb =
 156                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 157         if (IS_ERR(helper->fb)) {
 158                 DRM_ERROR("failed to create drm framebuffer.\n");
 159                 ret = PTR_ERR(helper->fb);
 160                 goto err_destroy_gem;
 161         }
 162
 163         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 164         if (ret < 0)
 165                 goto err_destroy_framebuffer;
 166
 167         return ret;
 168
 169 err_destroy_framebuffer:
 170         drm_framebuffer_cleanup(helper->fb);
 171 err_destroy_gem:
 172         exynos_drm_gem_destroy(exynos_gem);
 173
 174         /*
 175          * if failed, all resources allocated above would be released by
 176          * drm_mode_config_cleanup() when drm_load() had been called prior
 177          * to any specific driver such as fimd or hdmi driver.
 178          */
 179
 180         return ret;
 181 }
 182
 183 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 184         .fb_probe =     exynos_drm_fbdev_create,
 185 };
 186
 187 int exynos_drm_fbdev_init(struct drm_device *dev)
 188 {
 189         struct exynos_drm_fbdev *fbdev;
 190         struct exynos_drm_private *private = dev->dev_private;
 191         struct drm_fb_helper *helper;
 192         int ret;
 193
 194         if (!dev->mode_config.num_crtc)
 195                 return 0;
 196
 197         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 198         if (!fbdev)
 199                 return -ENOMEM;
 200
 201         private->fb_helper = helper = &fbdev->drm_fb_helper;
 202
 203         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 204
 205         ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
 206         if (ret < 0) {
 207                 DRM_ERROR("failed to initialize drm fb helper.\n");
 208                 goto err_init;
 209         }
 210
 211         ret = drm_fb_helper_single_add_all_connectors(helper);
 212         if (ret < 0) {
 213                 DRM_ERROR("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_ERROR("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