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 "exynos_drm_drv.h"
  22 #include "exynos_drm_fb.h"
  23 #include "exynos_drm_fbdev.h"
  24 #include "exynos_drm_iommu.h"
  25
  26 #define MAX_CONNECTOR           4
  27 #define PREFERRED_BPP           32
  28
  29 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  30                                 drm_fb_helper)
  31
  32 struct exynos_drm_fbdev {
  33         struct drm_fb_helper            drm_fb_helper;
  34         struct exynos_drm_gem_obj       *obj;
  35 };
  36
  37 static int exynos_drm_fb_mmap(struct fb_info *info,
  38                         struct vm_area_struct *vma)
  39 {
  40         struct drm_fb_helper *helper = info->par;
  41         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  42         struct exynos_drm_gem_obj *obj = exynos_fbd->obj;
  43         unsigned long vm_size;
  44         int ret;
  45
  46         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  47
  48         vm_size = vma->vm_end - vma->vm_start;
  49
  50         if (vm_size > obj->size)
  51                 return -EINVAL;
  52
  53         ret = dma_mmap_attrs(helper->dev->dev, vma, obj->pages, obj->dma_addr,
  54                              obj->size, &obj->dma_attrs);
  55         if (ret < 0) {
  56                 DRM_ERROR("failed to mmap.\n");
  57                 return ret;
  58         }
  59
  60         return 0;
  61 }
  62
  63 static struct fb_ops exynos_drm_fb_ops = {
  64         .owner          = THIS_MODULE,
  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         .fb_check_var   = drm_fb_helper_check_var,
  70         .fb_set_par     = drm_fb_helper_set_par,
  71         .fb_blank       = drm_fb_helper_blank,
  72         .fb_pan_display = drm_fb_helper_pan_display,
  73         .fb_setcmap     = drm_fb_helper_setcmap,
  74 };
  75
  76 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  77                                    struct drm_fb_helper_surface_size *sizes,
  78                                    struct exynos_drm_gem_obj *obj)
  79 {
  80         struct fb_info *fbi;
  81         struct drm_framebuffer *fb = helper->fb;
  82         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  83         unsigned int nr_pages;
  84         unsigned long offset;
  85
  86         fbi = drm_fb_helper_alloc_fbi(helper);
  87         if (IS_ERR(fbi)) {
  88                 DRM_ERROR("failed to allocate fb info.\n");
  89                 return PTR_ERR(fbi);
  90         }
  91
  92         fbi->par = helper;
  93         fbi->flags = FBINFO_FLAG_DEFAULT;
  94         fbi->fbops = &exynos_drm_fb_ops;
  95
  96         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  97         drm_fb_helper_fill_var(fbi, helper, sizes->fb_width, sizes->fb_height);
  98
  99         nr_pages = obj->size >> PAGE_SHIFT;
 100
 101         obj->kvaddr = (void __iomem *) vmap(obj->pages, nr_pages, VM_MAP,
 102                         pgprot_writecombine(PAGE_KERNEL));
 103         if (!obj->kvaddr) {
 104                 DRM_ERROR("failed to map pages to kernel space.\n");
 105                 drm_fb_helper_release_fbi(helper);
 106                 return -EIO;
 107         }
 108
 109         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 110         offset += fbi->var.yoffset * fb->pitches[0];
 111
 112         fbi->screen_base = obj->kvaddr + offset;
 113         fbi->screen_size = size;
 114         fbi->fix.smem_len = size;
 115
 116         return 0;
 117 }
 118
 119 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 120                                     struct drm_fb_helper_surface_size *sizes)
 121 {
 122         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 123         struct exynos_drm_gem_obj *obj;
 124         struct drm_device *dev = helper->dev;
 125         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 126         struct platform_device *pdev = dev->platformdev;
 127         unsigned long size;
 128         int ret;
 129
 130         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 131                         sizes->surface_width, sizes->surface_height,
 132                         sizes->surface_bpp);
 133
 134         mode_cmd.width = sizes->surface_width;
 135         mode_cmd.height = sizes->surface_height;
 136         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 137         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 138                                                           sizes->surface_depth);
 139
 140         mutex_lock(&dev->struct_mutex);
 141
 142         size = mode_cmd.pitches[0] * mode_cmd.height;
 143
 144         obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 145         /*
 146          * If physically contiguous memory allocation fails and if IOMMU is
 147          * supported then try to get buffer from non physically contiguous
 148          * memory area.
 149          */
 150         if (IS_ERR(obj) && is_drm_iommu_supported(dev)) {
 151                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 152                 obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG, size);
 153         }
 154
 155         if (IS_ERR(obj)) {
 156                 ret = PTR_ERR(obj);
 157                 goto out;
 158         }
 159
 160         exynos_fbdev->obj = obj;
 161
 162         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd, &obj, 1);
 163         if (IS_ERR(helper->fb)) {
 164                 DRM_ERROR("failed to create drm framebuffer.\n");
 165                 ret = PTR_ERR(helper->fb);
 166                 goto err_destroy_gem;
 167         }
 168
 169         ret = exynos_drm_fbdev_update(helper, sizes, obj);
 170         if (ret < 0)
 171                 goto err_destroy_framebuffer;
 172
 173         mutex_unlock(&dev->struct_mutex);
 174         return ret;
 175
 176 err_destroy_framebuffer:
 177         drm_framebuffer_cleanup(helper->fb);
 178 err_destroy_gem:
 179         exynos_drm_gem_destroy(obj);
 180
 181 /*
 182  * if failed, all resources allocated above would be released by
 183  * drm_mode_config_cleanup() when drm_load() had been called prior
 184  * to any specific driver such as fimd or hdmi driver.
 185  */
 186 out:
 187         mutex_unlock(&dev->struct_mutex);
 188         return ret;
 189 }
 190
 191 static const struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 192         .fb_probe =     exynos_drm_fbdev_create,
 193 };
 194
 195 static bool exynos_drm_fbdev_is_anything_connected(struct drm_device *dev)
 196 {
 197         struct drm_connector *connector;
 198         bool ret = false;
 199
 200         mutex_lock(&dev->mode_config.mutex);
 201         list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
 202                 if (connector->status != connector_status_connected)
 203                         continue;
 204
 205                 ret = true;
 206                 break;
 207         }
 208         mutex_unlock(&dev->mode_config.mutex);
 209
 210         return ret;
 211 }
 212
 213 int exynos_drm_fbdev_init(struct drm_device *dev)
 214 {
 215         struct exynos_drm_fbdev *fbdev;
 216         struct exynos_drm_private *private = dev->dev_private;
 217         struct drm_fb_helper *helper;
 218         unsigned int num_crtc;
 219         int ret;
 220
 221         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 222                 return 0;
 223
 224         if (!exynos_drm_fbdev_is_anything_connected(dev))
 225                 return 0;
 226
 227         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 228         if (!fbdev)
 229                 return -ENOMEM;
 230
 231         private->fb_helper = helper = &fbdev->drm_fb_helper;
 232
 233         drm_fb_helper_prepare(dev, helper, &exynos_drm_fb_helper_funcs);
 234
 235         num_crtc = dev->mode_config.num_crtc;
 236
 237         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 238         if (ret < 0) {
 239                 DRM_ERROR("failed to initialize drm fb helper.\n");
 240                 goto err_init;
 241         }
 242
 243         ret = drm_fb_helper_single_add_all_connectors(helper);
 244         if (ret < 0) {
 245                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 246                 goto err_setup;
 247
 248         }
 249
 250         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 251         if (ret < 0) {
 252                 DRM_ERROR("failed to set up hw configuration.\n");
 253                 goto err_setup;
 254         }
 255
 256         return 0;
 257
 258 err_setup:
 259         drm_fb_helper_fini(helper);
 260
 261 err_init:
 262         private->fb_helper = NULL;
 263         kfree(fbdev);
 264
 265         return ret;
 266 }
 267
 268 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 269                                       struct drm_fb_helper *fb_helper)
 270 {
 271         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 272         struct exynos_drm_gem_obj *obj = exynos_fbd->obj;
 273         struct drm_framebuffer *fb;
 274
 275         if (obj->kvaddr)
 276                 vunmap(obj->kvaddr);
 277
 278         /* release drm framebuffer and real buffer */
 279         if (fb_helper->fb && fb_helper->fb->funcs) {
 280                 fb = fb_helper->fb;
 281                 if (fb) {
 282                         drm_framebuffer_unregister_private(fb);
 283                         drm_framebuffer_remove(fb);
 284                 }
 285         }
 286
 287         drm_fb_helper_unregister_fbi(fb_helper);
 288         drm_fb_helper_release_fbi(fb_helper);
 289
 290         drm_fb_helper_fini(fb_helper);
 291 }
 292
 293 void exynos_drm_fbdev_fini(struct drm_device *dev)
 294 {
 295         struct exynos_drm_private *private = dev->dev_private;
 296         struct exynos_drm_fbdev *fbdev;
 297
 298         if (!private || !private->fb_helper)
 299                 return;
 300
 301         fbdev = to_exynos_fbdev(private->fb_helper);
 302
 303         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 304         kfree(fbdev);
 305         private->fb_helper = NULL;
 306 }
 307
 308 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 309 {
 310         struct exynos_drm_private *private = dev->dev_private;
 311
 312         if (!private || !private->fb_helper)
 313                 return;
 314
 315         drm_fb_helper_restore_fbdev_mode_unlocked(private->fb_helper);
 316 }