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         vma->vm_flags |= VM_IO | VM_DONTEXPAND | VM_DONTDUMP;
  47
  48         vm_size = vma->vm_end - vma->vm_start;
  49
  50         if (vm_size > buffer->size)
  51                 return -EINVAL;
  52
  53         ret = dma_mmap_attrs(helper->dev->dev, vma, buffer->pages,
  54                 buffer->dma_addr, buffer->size, &buffer->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    = cfb_fillrect,
  67         .fb_copyarea    = cfb_copyarea,
  68         .fb_imageblit   = 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_framebuffer *fb)
  78 {
  79         struct fb_info *fbi = helper->fbdev;
  80         struct drm_device *dev = helper->dev;
  81         struct exynos_drm_gem_buf *buffer;
  82         unsigned int size = fb->width * fb->height * (fb->bits_per_pixel >> 3);
  83         unsigned long offset;
  84
  85         drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->depth);
  86         drm_fb_helper_fill_var(fbi, helper, fb->width, fb->height);
  87
  88         /* RGB formats use only one buffer */
  89         buffer = exynos_drm_fb_buffer(fb, 0);
  90         if (!buffer) {
  91                 DRM_LOG_KMS("buffer is null.\n");
  92                 return -EFAULT;
  93         }
  94
  95         /* map pages with kernel virtual space. */
  96         if (!buffer->kvaddr) {
  97                 if (is_drm_iommu_supported(dev)) {
  98                         unsigned int nr_pages = buffer->size >> PAGE_SHIFT;
  99
 100                         buffer->kvaddr = vmap(buffer->pages, nr_pages, VM_MAP,
 101                                         pgprot_writecombine(PAGE_KERNEL));
 102                 } else {
 103                         phys_addr_t dma_addr = buffer->dma_addr;
 104                         if (dma_addr)
 105                                 buffer->kvaddr = phys_to_virt(dma_addr);
 106                         else
 107                                 buffer->kvaddr = (void __iomem *)NULL;
 108                 }
 109                 if (!buffer->kvaddr) {
 110                         DRM_ERROR("failed to map pages to kernel space.\n");
 111                         return -EIO;
 112                 }
 113         }
 114
 115         /* buffer count to framebuffer always is 1 at booting time. */
 116         exynos_drm_fb_set_buf_cnt(fb, 1);
 117
 118         offset = fbi->var.xoffset * (fb->bits_per_pixel >> 3);
 119         offset += fbi->var.yoffset * fb->pitches[0];
 120
 121         dev->mode_config.fb_base = (resource_size_t)buffer->dma_addr;
 122         fbi->screen_base = buffer->kvaddr + offset;
 123         if (is_drm_iommu_supported(dev))
 124                 fbi->fix.smem_start = (unsigned long)
 125                         (page_to_phys(sg_page(buffer->sgt->sgl)) + offset);
 126         else
 127                 fbi->fix.smem_start = (unsigned long)buffer->dma_addr;
 128
 129         fbi->screen_size = size;
 130         fbi->fix.smem_len = size;
 131
 132         return 0;
 133 }
 134
 135 static int exynos_drm_fbdev_create(struct drm_fb_helper *helper,
 136                                     struct drm_fb_helper_surface_size *sizes)
 137 {
 138         struct exynos_drm_fbdev *exynos_fbdev = to_exynos_fbdev(helper);
 139         struct exynos_drm_gem_obj *exynos_gem_obj;
 140         struct drm_device *dev = helper->dev;
 141         struct fb_info *fbi;
 142         struct drm_mode_fb_cmd2 mode_cmd = { 0 };
 143         struct platform_device *pdev = dev->platformdev;
 144         unsigned long size;
 145         int ret;
 146
 147         DRM_DEBUG_KMS("surface width(%d), height(%d) and bpp(%d\n",
 148                         sizes->surface_width, sizes->surface_height,
 149                         sizes->surface_bpp);
 150
 151         mode_cmd.width = sizes->surface_width;
 152         mode_cmd.height = sizes->surface_height;
 153         mode_cmd.pitches[0] = sizes->surface_width * (sizes->surface_bpp >> 3);
 154         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 155                                                           sizes->surface_depth);
 156
 157         mutex_lock(&dev->struct_mutex);
 158
 159         fbi = framebuffer_alloc(0, &pdev->dev);
 160         if (!fbi) {
 161                 DRM_ERROR("failed to allocate fb info.\n");
 162                 ret = -ENOMEM;
 163                 goto out;
 164         }
 165
 166         size = mode_cmd.pitches[0] * mode_cmd.height;
 167
 168         /* 0 means to allocate physically continuous memory */
 169         exynos_gem_obj = exynos_drm_gem_create(dev, 0, size);
 170         if (IS_ERR(exynos_gem_obj)) {
 171                 ret = PTR_ERR(exynos_gem_obj);
 172                 goto err_release_framebuffer;
 173         }
 174
 175         exynos_fbdev->exynos_gem_obj = exynos_gem_obj;
 176
 177         helper->fb = exynos_drm_framebuffer_init(dev, &mode_cmd,
 178                         &exynos_gem_obj->base);
 179         if (IS_ERR(helper->fb)) {
 180                 DRM_ERROR("failed to create drm framebuffer.\n");
 181                 ret = PTR_ERR(helper->fb);
 182                 goto err_destroy_gem;
 183         }
 184
 185         helper->fbdev = fbi;
 186
 187         fbi->par = helper;
 188         fbi->flags = FBINFO_FLAG_DEFAULT;
 189         fbi->fbops = &exynos_drm_fb_ops;
 190
 191         ret = fb_alloc_cmap(&fbi->cmap, 256, 0);
 192         if (ret) {
 193                 DRM_ERROR("failed to allocate cmap.\n");
 194                 goto err_destroy_framebuffer;
 195         }
 196
 197         ret = exynos_drm_fbdev_update(helper, helper->fb);
 198         if (ret < 0)
 199                 goto err_dealloc_cmap;
 200
 201         mutex_unlock(&dev->struct_mutex);
 202         return ret;
 203
 204 err_dealloc_cmap:
 205         fb_dealloc_cmap(&fbi->cmap);
 206 err_destroy_framebuffer:
 207         drm_framebuffer_cleanup(helper->fb);
 208 err_destroy_gem:
 209         exynos_drm_gem_destroy(exynos_gem_obj);
 210 err_release_framebuffer:
 211         framebuffer_release(fbi);
 212
 213 /*
 214  * if failed, all resources allocated above would be released by
 215  * drm_mode_config_cleanup() when drm_load() had been called prior
 216  * to any specific driver such as fimd or hdmi driver.
 217  */
 218 out:
 219         mutex_unlock(&dev->struct_mutex);
 220         return ret;
 221 }
 222
 223 static struct drm_fb_helper_funcs exynos_drm_fb_helper_funcs = {
 224         .fb_probe =     exynos_drm_fbdev_create,
 225 };
 226
 227 int exynos_drm_fbdev_init(struct drm_device *dev)
 228 {
 229         struct exynos_drm_fbdev *fbdev;
 230         struct exynos_drm_private *private = dev->dev_private;
 231         struct drm_fb_helper *helper;
 232         unsigned int num_crtc;
 233         int ret;
 234
 235         if (!dev->mode_config.num_crtc || !dev->mode_config.num_connector)
 236                 return 0;
 237
 238         fbdev = kzalloc(sizeof(*fbdev), GFP_KERNEL);
 239         if (!fbdev) {
 240                 DRM_ERROR("failed to allocate drm fbdev.\n");
 241                 return -ENOMEM;
 242         }
 243
 244         private->fb_helper = helper = &fbdev->drm_fb_helper;
 245         helper->funcs = &exynos_drm_fb_helper_funcs;
 246
 247         num_crtc = dev->mode_config.num_crtc;
 248
 249         ret = drm_fb_helper_init(dev, helper, num_crtc, MAX_CONNECTOR);
 250         if (ret < 0) {
 251                 DRM_ERROR("failed to initialize drm fb helper.\n");
 252                 goto err_init;
 253         }
 254
 255         ret = drm_fb_helper_single_add_all_connectors(helper);
 256         if (ret < 0) {
 257                 DRM_ERROR("failed to register drm_fb_helper_connector.\n");
 258                 goto err_setup;
 259
 260         }
 261
 262         /* disable all the possible outputs/crtcs before entering KMS mode */
 263         drm_helper_disable_unused_functions(dev);
 264
 265         ret = drm_fb_helper_initial_config(helper, PREFERRED_BPP);
 266         if (ret < 0) {
 267                 DRM_ERROR("failed to set up hw configuration.\n");
 268                 goto err_setup;
 269         }
 270
 271         return 0;
 272
 273 err_setup:
 274         drm_fb_helper_fini(helper);
 275
 276 err_init:
 277         private->fb_helper = NULL;
 278         kfree(fbdev);
 279
 280         return ret;
 281 }
 282
 283 static void exynos_drm_fbdev_destroy(struct drm_device *dev,
 284                                       struct drm_fb_helper *fb_helper)
 285 {
 286         struct exynos_drm_fbdev *exynos_fbd = to_exynos_fbdev(fb_helper);
 287         struct exynos_drm_gem_obj *exynos_gem_obj = exynos_fbd->exynos_gem_obj;
 288         struct drm_framebuffer *fb;
 289
 290         if (is_drm_iommu_supported(dev) && exynos_gem_obj->buffer->kvaddr)
 291                 vunmap(exynos_gem_obj->buffer->kvaddr);
 292
 293         /* release drm framebuffer and real buffer */
 294         if (fb_helper->fb && fb_helper->fb->funcs) {
 295                 fb = fb_helper->fb;
 296                 if (fb) {
 297                         drm_framebuffer_unregister_private(fb);
 298                         drm_framebuffer_remove(fb);
 299                 }
 300         }
 301
 302         /* release linux framebuffer */
 303         if (fb_helper->fbdev) {
 304                 struct fb_info *info;
 305                 int ret;
 306
 307                 info = fb_helper->fbdev;
 308                 ret = unregister_framebuffer(info);
 309                 if (ret < 0)
 310                         DRM_DEBUG_KMS("failed unregister_framebuffer()\n");
 311
 312                 if (info->cmap.len)
 313                         fb_dealloc_cmap(&info->cmap);
 314
 315                 framebuffer_release(info);
 316         }
 317
 318         drm_fb_helper_fini(fb_helper);
 319 }
 320
 321 void exynos_drm_fbdev_fini(struct drm_device *dev)
 322 {
 323         struct exynos_drm_private *private = dev->dev_private;
 324         struct exynos_drm_fbdev *fbdev;
 325
 326         if (!private || !private->fb_helper)
 327                 return;
 328
 329         fbdev = to_exynos_fbdev(private->fb_helper);
 330
 331         if (fbdev->exynos_gem_obj)
 332                 exynos_drm_gem_destroy(fbdev->exynos_gem_obj);
 333
 334         exynos_drm_fbdev_destroy(dev, private->fb_helper);
 335         kfree(fbdev);
 336         private->fb_helper = NULL;
 337 }
 338
 339 void exynos_drm_fbdev_restore_mode(struct drm_device *dev)
 340 {
 341         struct exynos_drm_private *private = dev->dev_private;
 342
 343         if (!private || !private->fb_helper)
 344                 return;
 345
 346         drm_modeset_lock_all(dev);
 347         drm_fb_helper_restore_fbdev_mode(private->fb_helper);
 348         drm_modeset_unlock_all(dev);
 349 }