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_gem.h"
  25 #include "exynos_drm_iommu.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_obj       *exynos_gem_obj;
  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_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
  44         struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
  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 > buffer->size)
  53                 return -EINVAL;
  54
  55         ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
  56                 buffer->dma_addr, buffer->size, &buffer->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         .fb_mmap        = exynos_drm_fb_mmap,
  68         .fb_fillrect    = cfb_fillrect,
  69         .fb_copyarea    = cfb_copyarea,
  70         .fb_imageblit   = cfb_imageblit,
  71         .fb_check_var   = drm_fb_helper_check_var,
  72         .fb_set_par     = drm_fb_helper_set_par,
  73         .fb_blank       = drm_fb_helper_blank,
  74         .fb_pan_display = drm_fb_helper_pan_display,
  75         .fb_setcmap     = drm_fb_helper_setcmap,
  76 };
  77
  78 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  79                                      struct drm_framebuffer *fb)
  80 {
  81         struct fb_info *fbi = helper->fbdev;
  82         struct drm_device *dev = helper->dev;
  83         struct exynos_drm_gem_buf *buffer;
  84         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  85         unsigned long offset;
  86
  87         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  88         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  89
  90         /* RGB formats use only one buffer */
  91         buffer = exynos_drm_fb_buffer(fb, 0);
  92         if (!buffer) {
  93                 DRM_LOG_KMS("buffer is null.\n");
  94                 return -EFAULT;
  95         }
  96
  97         /* map pages with kernel virtual space. */
  98         if (!buffer->kvaddr) {
  99                 if (is_drm_iommu_supported(dev)) {
 100                         unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
 101
 102                         buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
 103                                         pgprot_writecombine(PAGE_KERNEL));
 104                 } else {
 105                         phys_addr_t dma_addr = buffer->dma_addr;
 106                         if (dma_addr)
 107                                 buffer->kvaddr = phys_to_virt(dma_addr);
 108                         else
 109                                 buffer->kvaddr = (void __iomem *)NULL;
 110                 }
 111                 if (!buffer->kvaddr) {
 112                         DRM_ERROR("failed to map pages to kernel space.\n");
 113                         return -EIO;
 114                 }
 115         }
 116
 117         /* buffer count to framebuffer always is 1 at booting time. */
 118         exynos_drm_fb_set_buf_cnt(fb, 1);
 119
 120         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 121         offset += fbi->var.yoffset * fb->pitches[0];
 122
 123         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 124         fbi->screen_base = buffer->kvaddr + offset;
 125         if (is_drm_iommu_supported(dev))
 126                 fbi->fix.smem_start = (unsigned long)
 127                         (page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
 128         else
 129                 fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
 130
 131         fbi->screen_size = size;
 132         fbi->fix.smem_len = size;
 133
 134         return 0;
 135 }
 136
 137 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 138                                     struct drm_fb_helper_surface_size *sizes)
 139 {
 140         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 141         struct exynos_drm_gem_obj *exynos_gem_obj;
 142         struct drm_device *dev = helper->dev;
 143         struct fb_info *fbi;
 144         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 145         struct platform_device *pdev = dev->platformdev;
 146         unsigned long size;
 147         int ret;
 148
 149         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 150                         sizes->surface_width, sizes->surface_height,
 151                         sizes->surface_bpp);
 152
 153         mode_cmd.width = sizes->surface_width;
 154         mode_cmd.height = sizes->surface_height;
 155         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 156         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 157                                                           sizes->surface_depth);
 158
 159         mutex_lock(&dev->struct_mutex);
 160
 161         fbi = framebuffer_alloc(0, &pdev->dev);
 162         if (!fbi) {
 163                 DRM_ERROR("failed to allocate fb info.\n");
 164                 ret = -ENOMEM;
 165                 goto out;
 166         }
 167
 168         size = mode_cmd.pitches[0] * mode_cmd.height;
 169
 170         exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 171         /*
 172          * If physically contiguous memory allocation fails and if IOMMU is
 173          * supported then try to get buffer from non physically contiguous
 174          * memory area.
 175          */
 176         if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
 177                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 178                 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 179                                                         size);
 180         }
 181
 182         if (IS_ERR(exynos_gem_obj)) {
 183                 ret = PTR_ERR(exynos_gem_obj);
 184                 goto err_release_framebuffer;
 185         }
 186
 187         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 188
 189         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 190                         &exynos_gem_obj->base);
 191         if (IS_ERR(helper->fb)) {
 192                 DRM_ERROR("failed to create drm framebuffer.\n");
 193                 ret = PTR_ERR(helper->fb);
 194                 goto err_destroy_gem;
 195         }
 196
 197         helper->fbdev = fbi;
 198
 199         fbi->par = helper;
 200         fbi->flags = FBINFO_FLAG_DEFAULT;
 201         fbi->fbops = &exynos_drm_fb_ops;
 202
 203         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 204         if (ret) {
 205                 DRM_ERROR("failed to allocate cmap.\n");
 206                 goto err_destroy_framebuffer;
 207         }
 208
 209         ret = exynos_drm_fbdev_update(helper, helper->fb);
 210         if (ret < 0)
 211                 goto err_dealloc_cmap;
 212
 213         mutex_unlock(&dev->struct_mutex);
 214         return ret;
 215
 216 err_dealloc_cmap:
 217         fb_dealloc_cmap(&fbi->cmap);
 218 err_destroy_framebuffer:
 219         drm_framebuffer_cleanup(helper->fb);
 220 err_destroy_gem:
 221         exynos_drm_gem_destroy(exynos_gem_obj);
 222 err_release_framebuffer:
 223         framebuffer_release(fbi);
 224
 225 /*
 226  * if failed, all resources allocated above would be released by
 227  * drm_mode_config_cleanup() when drm_load() had been called prior
 228  * to any specific driver such as fimd or hdmi driver.
 229  */
 230 out:
 231         mutex_unlock(&dev->struct_mutex);
 232         return ret;
 233 }
 234
 235 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 236         .fb_probe =     exynos_drm_fbdev_create,
 237 };
 238
 239 int exynos_drm_fbdev_init(struct drm_device *dev)
 240 {
 241         struct exynos_drm_fbdev *fbdev;
 242         struct exynos_drm_private *private = dev->dev_private;
 243         struct drm_fb_helper *helper;
 244         unsigned int num_crtc;
 245         int ret;
 246
 247         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 248                 return 0;
 249
 250         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 251         if (!fbdev)
 252                 return -ENOMEM;
 253
 254         private->fb_helper = helper = &fbdev->drm_fb_helper;
 255         helper->funcs = &exynos_drm_fb_helper_funcs;
 256
 257         num_crtc = dev->mode_config.num_crtc;
 258
 259         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 260         if (ret < 0) {
 261                 DRM_ERROR("failed to initialize drm fb helper.\n");
 262                 goto err_init;
 263         }
 264
 265         ret = drm_fb_helper_single_add_all_connectors(helper);
 266         if (ret < 0) {
 267                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 268                 goto err_setup;
 269
 270         }
 271
 272         /* disable all the possible outputs/crtcs before entering KMS mode */
 273         drm_helper_disable_unused_functions(dev);
 274
 275         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 276         if (ret < 0) {
 277                 DRM_ERROR("failed to set up hw configuration.\n");
 278                 goto err_setup;
 279         }
 280
 281         return 0;
 282
 283 err_setup:
 284         drm_fb_helper_fini(helper);
 285
 286 err_init:
 287         private->fb_helper = NULL;
 288         kfree(fbdev);
 289
 290         return ret;
 291 }
 292
 293 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 294                                       struct drm_fb_helper *fb_helper)
 295 {
 296         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 297         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 298         struct drm_framebuffer *fb;
 299
 300         if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
 301                 vunmap(exynos_gem_obj->buffer->kvaddr);
 302
 303         /* release drm framebuffer and real buffer */
 304         if (fb_helper->fb && fb_helper->fb->funcs) {
 305                 fb = fb_helper->fb;
 306                 if (fb) {
 307                         drm_framebuffer_unregister_private(fb);
 308                         drm_framebuffer_remove(fb);
 309                 }
 310         }
 311
 312         /* release linux framebuffer */
 313         if (fb_helper->fbdev) {
 314                 struct fb_info *info;
 315                 int ret;
 316
 317                 info = fb_helper->fbdev;
 318                 ret = unregister_framebuffer(info);
 319                 if (ret < 0)
 320                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 321
 322                 if (info->cmap.len)
 323                         fb_dealloc_cmap(&info->cmap);
 324
 325                 framebuffer_release(info);
 326         }
 327
 328         drm_fb_helper_fini(fb_helper);
 329 }
 330
 331 void exynos_drm_fbdev_fini(struct drm_device *dev)
 332 {
 333         struct exynos_drm_private *private = dev->dev_private;
 334         struct exynos_drm_fbdev *fbdev;
 335
 336         if (!private || !private->fb_helper)
 337                 return;
 338
 339         fbdev = to_exynos_fbdev(private->fb_helper);
 340
 341         if (fbdev->exynos_gem_obj)
 342                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 343
 344         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 345         kfree(fbdev);
 346         private->fb_helper = NULL;
 347 }
 348
 349 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 350 {
 351         struct exynos_drm_private *private = dev->dev_private;
 352
 353         if (!private || !private->fb_helper)
 354                 return;
 355
 356         drm_modeset_lock_all(dev);
 357         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 358         drm_modeset_unlock_all(dev);
 359 }