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 #include "exynos_drm_iommu.h"
  27
  28 #define MAX_CONNECTOR           4
  29 #define PREFERRED_BPP           32
  30
  31 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  32                                 drm_fb_helper)
  33
  34 struct exynos_drm_fbdev {
  35         struct drm_fb_helper    drm_fb_helper;
  36         struct exynos_drm_gem   *exynos_gem;
  37 };
  38
  39 static int exynos_drm_fb_mmap(struct fb_info *info,
  40                         struct vm_area_struct *vma)
  41 {
  42         struct drm_fb_helper *helper = info->par;
  43         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  44         struct exynos_drm_gem *exynos_gem = exynos_fbd->exynos_gem;
  45         unsigned long vm_size;
  46         int ret;
  47
  48         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  49
  50         vm_size = vma->vm_end - vma->vm_start;
  51
  52         if (vm_size > exynos_gem->size)
  53                 return -EINVAL;
  54
  55         ret = dma_mmap_attrs(to_dma_dev(helper->dev), vma, exynos_gem->cookie,
  56                              exynos_gem->dma_addr, exynos_gem->size,
  57                              exynos_gem->dma_attrs);
  58         if (ret < 0) {
  59                 DRM_ERROR("failed to mmap.\n");
  60                 return ret;
  61         }
  62
  63         return 0;
  64 }
  65
  66 static struct fb_ops exynos_drm_fb_ops = {
  67         .owner          = THIS_MODULE,
  68         DRM_FB_HELPER_DEFAULT_OPS,
  69         .fb_mmap        = exynos_drm_fb_mmap,
  70         .fb_fillrect    = drm_fb_helper_cfb_fillrect,
  71         .fb_copyarea    = drm_fb_helper_cfb_copyarea,
  72         .fb_imageblit   = drm_fb_helper_cfb_imageblit,
  73 };
  74
  75 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  76                                    struct drm_fb_helper_surface_size *sizes,
  77                                    struct exynos_drm_gem *exynos_gem)
  78 {
  79         struct fb_info *fbi;
  80         struct drm_framebuffer *fb = helper->fb;
  81         unsigned int size = fb->width * fb->height * fb->format->cpp[0];
  82         unsigned int nr_pages;
  83         unsigned long offset;
  84
  85         fbi = drm_fb_helper_alloc_fbi(helper);
  86         if (IS_ERR(fbi)) {
  87                 DRM_ERROR("failed to allocate fb info.\n");
  88                 return PTR_ERR(fbi);
  89         }
  90
  91         fbi->par = helper;
  92         fbi->flags = FBINFO_FLAG_DEFAULT;
  93         fbi->fbops = &exynos_drm_fb_ops;
  94
  95         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
  96         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  97
  98         nr_pages = exynos_gem->size >> PAGE_SHIFT;
  99
 100         exynos_gem->kvaddr = (void __iomem *) vmap(exynos_gem->pages, nr_pages,
 101                                 VM_MAP, pgprot_writecombine(PAGE_KERNEL));
 102         if (!exynos_gem->kvaddr) {
 103                 DRM_ERROR("failed to map pages to kernel space.\n");
 104                 return -EIO;
 105         }
 106
 107         offset = fbi->var.xoffset * fb->format->cpp[0];
 108         offset += fbi->var.yoffset * fb->pitches[0];
 109
 110         fbi->screen_base = exynos_gem->kvaddr + offset;
 111         fbi->screen_size = size;
 112         fbi->fix.smem_len = size;
 113
 114         return 0;
 115 }
 116
 117 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 118                                     struct drm_fb_helper_surface_size *sizes)
 119 {
 120         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 121         struct exynos_drm_gem *exynos_gem;
 122         struct drm_device *dev = helper->dev;
 123         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 124         unsigned long size;
 125         int ret;
 126
 127         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 128                         sizes->surface_width, sizes->surface_height,
 129                         sizes->surface_bpp);
 130
 131         mode_cmd.width = sizes->surface_width;
 132         mode_cmd.height = sizes->surface_height;
 133         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 134         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 135                                                           sizes->surface_depth);
 136
 137         size = mode_cmd.pitches[0] * mode_cmd.height;
 138
 139         exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 140         /*
 141          * If physically contiguous memory allocation fails and if IOMMU is
 142          * supported then try to get buffer from non physically contiguous
 143          * memory area.
 144          */
 145         if (IS_ERR(exynos_gem) && is_drm_iommu_supported(dev)) {
 146                 dev_warn(dev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 147                 exynos_gem = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 148                                                    size);
 149         }
 150
 151         if (IS_ERR(exynos_gem))
 152                 return PTR_ERR(exynos_gem);
 153
 154         exynos_fbdev->exynos_gem = exynos_gem;
 155
 156         helper->fb =
 157                 exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
 158         if (IS_ERR(helper->fb)) {
 159                 DRM_ERROR("failed to create drm framebuffer.\n");
 160                 ret = PTR_ERR(helper->fb);
 161                 goto err_destroy_gem;
 162         }
 163
 164         ret = exynos_drm_fbdev_update(helper, sizes, exynos_gem);
 165         if (ret < 0)
 166                 goto err_destroy_framebuffer;
 167
 168         return ret;
 169
 170 err_destroy_framebuffer:
 171         drm_framebuffer_cleanup(helper->fb);
 172 err_destroy_gem:
 173         exynos_drm_gem_destroy(exynos_gem);
 174
 175         /*
 176          * if failed, all resources allocated above would be released by
 177          * drm_mode_config_cleanup() when drm_load() had been called prior
 178          * to any specific driver such as fimd or hdmi driver.
 179          */
 180
 181         return ret;
 182 }
 183
 184 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 185         .fb_probe =     exynos_drm_fbdev_create,
 186 };
 187
 188 int exynos_drm_fbdev_init(struct drm_device *dev)
 189 {
 190         struct exynos_drm_fbdev *fbdev;
 191         struct exynos_drm_private *private = dev->dev_private;
 192         struct drm_fb_helper *helper;
 193         int ret;
 194
 195         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 196                 return 0;
 197
 198         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 199         if (!fbdev)
 200                 return -ENOMEM;
 201
 202         private->fb_helper = helper = &fbdev->drm_fb_helper;
 203
 204         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 205
 206         ret = drm_fb_helper_init(dev, helper, MAX_CONNECTOR);
 207         if (ret < 0) {
 208                 DRM_ERROR("failed to initialize drm fb helper.\n");
 209                 goto err_init;
 210         }
 211
 212         ret = drm_fb_helper_single_add_all_connectors(helper);
 213         if (ret < 0) {
 214                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 215                 goto err_setup;
 216
 217         }
 218
 219         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 220         if (ret < 0) {
 221                 DRM_ERROR("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
 273 void exynos_drm_fbdev_suspend(struct drm_device *dev)
 274 {
 275         struct exynos_drm_private *private = dev->dev_private;
 276
 277         console_lock();
 278         drm_fb_helper_set_suspend(private->fb_helper, 1);
 279         console_unlock();
 280 }
 281
 282 void exynos_drm_fbdev_resume(struct drm_device *dev)
 283 {
 284         struct exynos_drm_private *private = dev->dev_private;
 285
 286         console_lock();
 287         drm_fb_helper_set_suspend(private->fb_helper, 0);
 288         console_unlock();
 289 }