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
  20 #include "exynos_drm_drv.h"
  21 #include "exynos_drm_fb.h"
  22 #include "exynos_drm_gem.h"
  23 #include "exynos_drm_iommu.h"
  24
  25 #define MAX_CONNECTOR           4
  26 #define PREFERRED_BPP           32
  27
  28 #define to_exynos_fbdev(x)      container_of(x, struct exynos_drm_fbdev,\
  29                                 drm_fb_helper)
  30
  31 struct exynos_drm_fbdev {
  32         struct drm_fb_helper            drm_fb_helper;
  33         struct exynos_drm_gem_obj       *exynos_gem_obj;
  34 };
  35
  36 static int exynos_drm_fb_mmap(struct fb_info *info,
  37                         struct vm_area_struct *vma)
  38 {
  39         struct drm_fb_helper *helper = info->par;
  40         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(helper);
  41         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
  42         struct exynos_drm_gem_buf *buffer = exynos_gem_obj->buffer;
  43         unsigned long vm_size;
  44         int ret;
  45
  46         DRM_DEBUG_KMS("%s\n", __func__);
  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_DEBUG_KMS("%s\n", __FILE__);
  88
  89         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  90         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  91
  92         /* RGB formats use only one buffer */
  93         buffer = exynos_drm_fb_buffer(fb, 0);
  94         if (!buffer) {
  95                 DRM_LOG_KMS("buffer is null.\n");
  96                 return -EFAULT;
  97         }
  98
  99         /* map pages with kernel virtual space. */
 100         if (!buffer->kvaddr) {
 101                 if (is_drm_iommu_supported(dev)) {
 102                         unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
 103
 104                         buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
 105                                         pgprot_writecombine(PAGE_KERNEL));
 106                 } else {
 107                         phys_addr_t dma_addr = buffer->dma_addr;
 108                         if (dma_addr)
 109                                 buffer->kvaddr = phys_to_virt(dma_addr);
 110                         else
 111                                 buffer->kvaddr = (void __iomem *)NULL;
 112                 }
 113                 if (!buffer->kvaddr) {
 114                         DRM_ERROR("failed to map pages to kernel space.\n");
 115                         return -EIO;
 116                 }
 117         }
 118
 119         /* buffer count to framebuffer always is 1 at booting time. */
 120         exynos_drm_fb_set_buf_cnt(fb, 1);
 121
 122         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 123         offset += fbi->var.yoffset * fb->pitches[0];
 124
 125         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 126         fbi->screen_base = buffer->kvaddr + offset;
 127         if (is_drm_iommu_supported(dev))
 128                 fbi->fix.smem_start = (unsigned long)
 129                         (page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
 130         else
 131                 fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
 132
 133         fbi->screen_size = size;
 134         fbi->fix.smem_len = size;
 135
 136         return 0;
 137 }
 138
 139 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 140                                     struct drm_fb_helper_surface_size *sizes)
 141 {
 142         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 143         struct exynos_drm_gem_obj *exynos_gem_obj;
 144         struct drm_device *dev = helper->dev;
 145         struct fb_info *fbi;
 146         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 147         struct platform_device *pdev = dev->platformdev;
 148         unsigned long size;
 149         int ret;
 150
 151         DRM_DEBUG_KMS("%s\n", __FILE__);
 152
 153         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 154                         sizes->surface_width, sizes->surface_height,
 155                         sizes->surface_bpp);
 156
 157         mode_cmd.width = sizes->surface_width;
 158         mode_cmd.height = sizes->surface_height;
 159         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 160         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 161                                                           sizes->surface_depth);
 162
 163         mutex_lock(&dev->struct_mutex);
 164
 165         fbi = framebuffer_alloc(0, &pdev->dev);
 166         if (!fbi) {
 167                 DRM_ERROR("failed to allocate fb info.\n");
 168                 ret = -ENOMEM;
 169                 goto out;
 170         }
 171
 172         size = mode_cmd.pitches[0] * mode_cmd.height;
 173
 174         /* 0 means to allocate physically continuous memory */
 175         exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
 176         if (IS_ERR(exynos_gem_obj)) {
 177                 ret = PTR_ERR(exynos_gem_obj);
 178                 goto err_release_framebuffer;
 179         }
 180
 181         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 182
 183         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 184                         &exynos_gem_obj->base);
 185         if (IS_ERR_OR_NULL(helper->fb)) {
 186                 DRM_ERROR("failed to create drm framebuffer.\n");
 187                 ret = PTR_ERR(helper->fb);
 188                 goto err_destroy_gem;
 189         }
 190
 191         helper->fbdev = fbi;
 192
 193         fbi->par = helper;
 194         fbi->flags = FBINFO_FLAG_DEFAULT;
 195         fbi->fbops = &exynos_drm_fb_ops;
 196
 197         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 198         if (ret) {
 199                 DRM_ERROR("failed to allocate cmap.\n");
 200                 goto err_destroy_framebuffer;
 201         }
 202
 203         ret = exynos_drm_fbdev_update(helper, helper->fb);
 204         if (ret < 0)
 205                 goto err_dealloc_cmap;
 206
 207         mutex_unlock(&dev->struct_mutex);
 208         return ret;
 209
 210 err_dealloc_cmap:
 211         fb_dealloc_cmap(&fbi->cmap);
 212 err_destroy_framebuffer:
 213         drm_framebuffer_cleanup(helper->fb);
 214 err_destroy_gem:
 215         exynos_drm_gem_destroy(exynos_gem_obj);
 216 err_release_framebuffer:
 217         framebuffer_release(fbi);
 218
 219 /*
 220  * if failed, all resources allocated above would be released by
 221  * drm_mode_config_cleanup() when drm_load() had been called prior
 222  * to any specific driver such as fimd or hdmi driver.
 223  */
 224 out:
 225         mutex_unlock(&dev->struct_mutex);
 226         return ret;
 227 }
 228
 229 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 230         .fb_probe =     exynos_drm_fbdev_create,
 231 };
 232
 233 int exynos_drm_fbdev_init(struct drm_device *dev)
 234 {
 235         struct exynos_drm_fbdev *fbdev;
 236         struct exynos_drm_private *private = dev->dev_private;
 237         struct drm_fb_helper *helper;
 238         unsigned int num_crtc;
 239         int ret;
 240
 241         DRM_DEBUG_KMS("%s\n", __FILE__);
 242
 243         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 244                 return 0;
 245
 246         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 247         if (!fbdev) {
 248                 DRM_ERROR("failed to allocate drm fbdev.\n");
 249                 return -ENOMEM;
 250         }
 251
 252         private->fb_helper = helper = &fbdev->drm_fb_helper;
 253         helper->funcs = &exynos_drm_fb_helper_funcs;
 254
 255         num_crtc = dev->mode_config.num_crtc;
 256
 257         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 258         if (ret < 0) {
 259                 DRM_ERROR("failed to initialize drm fb helper.\n");
 260                 goto err_init;
 261         }
 262
 263         ret = drm_fb_helper_single_add_all_connectors(helper);
 264         if (ret < 0) {
 265                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 266                 goto err_setup;
 267
 268         }
 269
 270         /* disable all the possible outputs/crtcs before entering KMS mode */
 271         drm_helper_disable_unused_functions(dev);
 272
 273         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 274         if (ret < 0) {
 275                 DRM_ERROR("failed to set up hw configuration.\n");
 276                 goto err_setup;
 277         }
 278
 279         return 0;
 280
 281 err_setup:
 282         drm_fb_helper_fini(helper);
 283
 284 err_init:
 285         private->fb_helper = NULL;
 286         kfree(fbdev);
 287
 288         return ret;
 289 }
 290
 291 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 292                                       struct drm_fb_helper *fb_helper)
 293 {
 294         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 295         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 296         struct drm_framebuffer *fb;
 297
 298         if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
 299                 vunmap(exynos_gem_obj->buffer->kvaddr);
 300
 301         /* release drm framebuffer and real buffer */
 302         if (fb_helper->fb && fb_helper->fb->funcs) {
 303                 fb = fb_helper->fb;
 304                 if (fb) {
 305                         drm_framebuffer_unregister_private(fb);
 306                         drm_framebuffer_remove(fb);
 307                 }
 308         }
 309
 310         /* release linux framebuffer */
 311         if (fb_helper->fbdev) {
 312                 struct fb_info *info;
 313                 int ret;
 314
 315                 info = fb_helper->fbdev;
 316                 ret = unregister_framebuffer(info);
 317                 if (ret < 0)
 318                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 319
 320                 if (info->cmap.len)
 321                         fb_dealloc_cmap(&info->cmap);
 322
 323                 framebuffer_release(info);
 324         }
 325
 326         drm_fb_helper_fini(fb_helper);
 327 }
 328
 329 void exynos_drm_fbdev_fini(struct drm_device *dev)
 330 {
 331         struct exynos_drm_private *private = dev->dev_private;
 332         struct exynos_drm_fbdev *fbdev;
 333
 334         if (!private || !private->fb_helper)
 335                 return;
 336
 337         fbdev = to_exynos_fbdev(private->fb_helper);
 338
 339         if (fbdev->exynos_gem_obj)
 340                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 341
 342         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 343         kfree(fbdev);
 344         private->fb_helper = NULL;
 345 }
 346
 347 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 348 {
 349         struct exynos_drm_private *private = dev->dev_private;
 350
 351         if (!private || !private->fb_helper)
 352                 return;
 353
 354         drm_modeset_lock_all(dev);
 355         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 356         drm_modeset_unlock_all(dev);
 357 }