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_gem.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       *exynos_gem_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 *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
  43         struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
  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 > buffer->size)
  52                 return -EINVAL;
  53
  54         ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
  55                 buffer->dma_addr, buffer->size, &buffer->dma_attrs);
  56         if (ret < 0) {
  57                 DRM_ERROR("failed to mmap.\n");
  58                 return ret;
  59         }
  60
  61         return 0;
  62 }
  63
  64 static struct fb_ops exynos_drm_fb_ops = {
  65         .owner          = THIS_MODULE,
  66         .fb_mmap        = exynos_drm_fb_mmap,
  67         .fb_fillrect    = cfb_fillrect,
  68         .fb_copyarea    = cfb_copyarea,
  69         .fb_imageblit   = cfb_imageblit,
  70         .fb_check_var   = drm_fb_helper_check_var,
  71         .fb_set_par     = drm_fb_helper_set_par,
  72         .fb_blank       = drm_fb_helper_blank,
  73         .fb_pan_display = drm_fb_helper_pan_display,
  74         .fb_setcmap     = drm_fb_helper_setcmap,
  75 };
  76
  77 static int exynos_drm_fbdev_update(struct drm_fb_helper *helper,
  78                                      struct drm_framebuffer *fb)
  79 {
  80         struct fb_info *fbi = helper->fbdev;
  81         struct drm_device *dev = helper->dev;
  82         struct exynos_drm_gem_buf *buffer;
  83         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  84         unsigned long offset;
  85
  86         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  87         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  88
  89         /* RGB formats use only one buffer */
  90         buffer = exynos_drm_fb_buffer(fb, 0);
  91         if (!buffer) {
  92                 DRM_LOG_KMS("buffer is null.\n");
  93                 return -EFAULT;
  94         }
  95
  96         /* map pages with kernel virtual space. */
  97         if (!buffer->kvaddr) {
  98                 if (is_drm_iommu_supported(dev)) {
  99                         unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
 100
 101                         buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
 102                                         pgprot_writecombine(PAGE_KERNEL));
 103                 } else {
 104                         phys_addr_t dma_addr = buffer->dma_addr;
 105                         if (dma_addr)
 106                                 buffer->kvaddr = phys_to_virt(dma_addr);
 107                         else
 108                                 buffer->kvaddr = (void __iomem *)NULL;
 109                 }
 110                 if (!buffer->kvaddr) {
 111                         DRM_ERROR("failed to map pages to kernel space.\n");
 112                         return -EIO;
 113                 }
 114         }
 115
 116         /* buffer count to framebuffer always is 1 at booting time. */
 117         exynos_drm_fb_set_buf_cnt(fb, 1);
 118
 119         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 120         offset += fbi->var.yoffset * fb->pitches[0];
 121
 122         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 123         fbi->screen_base = buffer->kvaddr + offset;
 124         if (is_drm_iommu_supported(dev))
 125                 fbi->fix.smem_start = (unsigned long)
 126                         (page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
 127         else
 128                 fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
 129
 130         fbi->screen_size = size;
 131         fbi->fix.smem_len = size;
 132
 133         return 0;
 134 }
 135
 136 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 137                                     struct drm_fb_helper_surface_size *sizes)
 138 {
 139         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 140         struct exynos_drm_gem_obj *exynos_gem_obj;
 141         struct drm_device *dev = helper->dev;
 142         struct fb_info *fbi;
 143         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 144         struct platform_device *pdev = dev->platformdev;
 145         unsigned long size;
 146         int ret;
 147
 148         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 149                         sizes->surface_width, sizes->surface_height,
 150                         sizes->surface_bpp);
 151
 152         mode_cmd.width = sizes->surface_width;
 153         mode_cmd.height = sizes->surface_height;
 154         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 155         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 156                                                           sizes->surface_depth);
 157
 158         mutex_lock(&dev->struct_mutex);
 159
 160         fbi = framebuffer_alloc(0, &pdev->dev);
 161         if (!fbi) {
 162                 DRM_ERROR("failed to allocate fb info.\n");
 163                 ret = -ENOMEM;
 164                 goto out;
 165         }
 166
 167         size = mode_cmd.pitches[0] * mode_cmd.height;
 168
 169         exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_CONTIG, size);
 170         /*
 171          * If physically contiguous memory allocation fails and if IOMMU is
 172          * supported then try to get buffer from non physically contiguous
 173          * memory area.
 174          */
 175         if (IS_ERR(exynos_gem_obj) && is_drm_iommu_supported(dev)) {
 176                 dev_warn(&pdev->dev, "contiguous FB allocation failed, falling back to non-contiguous\n");
 177                 exynos_gem_obj = exynos_drm_gem_create(dev, EXYNOS_BO_NONCONTIG,
 178                                                         size);
 179         }
 180
 181         if (IS_ERR(exynos_gem_obj)) {
 182                 ret = PTR_ERR(exynos_gem_obj);
 183                 goto err_release_framebuffer;
 184         }
 185
 186         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 187
 188         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 189                         &exynos_gem_obj->base);
 190         if (IS_ERR(helper->fb)) {
 191                 DRM_ERROR("failed to create drm framebuffer.\n");
 192                 ret = PTR_ERR(helper->fb);
 193                 goto err_destroy_gem;
 194         }
 195
 196         helper->fbdev = fbi;
 197
 198         fbi->par = helper;
 199         fbi->flags = FBINFO_FLAG_DEFAULT;
 200         fbi->fbops = &exynos_drm_fb_ops;
 201
 202         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 203         if (ret) {
 204                 DRM_ERROR("failed to allocate cmap.\n");
 205                 goto err_destroy_framebuffer;
 206         }
 207
 208         ret = exynos_drm_fbdev_update(helper, helper->fb);
 209         if (ret < 0)
 210                 goto err_dealloc_cmap;
 211
 212         mutex_unlock(&dev->struct_mutex);
 213         return ret;
 214
 215 err_dealloc_cmap:
 216         fb_dealloc_cmap(&fbi->cmap);
 217 err_destroy_framebuffer:
 218         drm_framebuffer_cleanup(helper->fb);
 219 err_destroy_gem:
 220         exynos_drm_gem_destroy(exynos_gem_obj);
 221 err_release_framebuffer:
 222         framebuffer_release(fbi);
 223
 224 /*
 225  * if failed, all resources allocated above would be released by
 226  * drm_mode_config_cleanup() when drm_load() had been called prior
 227  * to any specific driver such as fimd or hdmi driver.
 228  */
 229 out:
 230         mutex_unlock(&dev->struct_mutex);
 231         return ret;
 232 }
 233
 234 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 235         .fb_probe =     exynos_drm_fbdev_create,
 236 };
 237
 238 int exynos_drm_fbdev_init(struct drm_device *dev)
 239 {
 240         struct exynos_drm_fbdev *fbdev;
 241         struct exynos_drm_private *private = dev->dev_private;
 242         struct drm_fb_helper *helper;
 243         unsigned int num_crtc;
 244         int ret;
 245
 246         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 247                 return 0;
 248
 249         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 250         if (!fbdev) {
 251                 DRM_ERROR("failed to allocate drm fbdev.\n");
 252                 return -ENOMEM;
 253         }
 254
 255         private->fb_helper = helper = &fbdev->drm_fb_helper;
 256         helper->funcs = &exynos_drm_fb_helper_funcs;
 257
 258         num_crtc = dev->mode_config.num_crtc;
 259
 260         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 261         if (ret < 0) {
 262                 DRM_ERROR("failed to initialize drm fb helper.\n");
 263                 goto err_init;
 264         }
 265
 266         ret = drm_fb_helper_single_add_all_connectors(helper);
 267         if (ret < 0) {
 268                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 269                 goto err_setup;
 270
 271         }
 272
 273         /* disable all the possible outputs/crtcs before entering KMS mode */
 274         drm_helper_disable_unused_functions(dev);
 275
 276         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 277         if (ret < 0) {
 278                 DRM_ERROR("failed to set up hw configuration.\n");
 279                 goto err_setup;
 280         }
 281
 282         return 0;
 283
 284 err_setup:
 285         drm_fb_helper_fini(helper);
 286
 287 err_init:
 288         private->fb_helper = NULL;
 289         kfree(fbdev);
 290
 291         return ret;
 292 }
 293
 294 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 295                                       struct drm_fb_helper *fb_helper)
 296 {
 297         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 298         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 299         struct drm_framebuffer *fb;
 300
 301         if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
 302                 vunmap(exynos_gem_obj->buffer->kvaddr);
 303
 304         /* release drm framebuffer and real buffer */
 305         if (fb_helper->fb && fb_helper->fb->funcs) {
 306                 fb = fb_helper->fb;
 307                 if (fb) {
 308                         drm_framebuffer_unregister_private(fb);
 309                         drm_framebuffer_remove(fb);
 310                 }
 311         }
 312
 313         /* release linux framebuffer */
 314         if (fb_helper->fbdev) {
 315                 struct fb_info *info;
 316                 int ret;
 317
 318                 info = fb_helper->fbdev;
 319                 ret = unregister_framebuffer(info);
 320                 if (ret < 0)
 321                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 322
 323                 if (info->cmap.len)
 324                         fb_dealloc_cmap(&info->cmap);
 325
 326                 framebuffer_release(info);
 327         }
 328
 329         drm_fb_helper_fini(fb_helper);
 330 }
 331
 332 void exynos_drm_fbdev_fini(struct drm_device *dev)
 333 {
 334         struct exynos_drm_private *private = dev->dev_private;
 335         struct exynos_drm_fbdev *fbdev;
 336
 337         if (!private || !private->fb_helper)
 338                 return;
 339
 340         fbdev = to_exynos_fbdev(private->fb_helper);
 341
 342         if (fbdev->exynos_gem_obj)
 343                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 344
 345         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 346         kfree(fbdev);
 347         private->fb_helper = NULL;
 348 }
 349
 350 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 351 {
 352         struct exynos_drm_private *private = dev->dev_private;
 353
 354         if (!private || !private->fb_helper)
 355                 return;
 356
 357         drm_modeset_lock_all(dev);
 358         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 359         drm_modeset_unlock_all(dev);
 360 }