drivers/gpu/drm/cirrus/cirrus_fbdev.c

   1 /*
   2  * Copyright 2012 Red Hat
   3  *
   4  * This file is subject to the terms and conditions of the GNU General
   5  * Public License version 2. See the file COPYING in the main
   6  * directory of this archive for more details.
   7  *
   8  * Authors: Matthew Garrett
   9  *          Dave Airlie
  10  */
  11 #include <linux/module.h>
  12 #include <drm/drmP.h>
  13 #include <drm/drm_fb_helper.h>
  14 #include <drm/drm_crtc_helper.h>
  15
  16 #include <linux/fb.h>
  17
  18 #include "cirrus_drv.h"
  19
  20 static void cirrus_dirty_update(struct cirrus_fbdev *afbdev,
  21                              int x, int y, int width, int height)
  22 {
  23         int i;
  24         struct drm_gem_object *obj;
  25         struct cirrus_bo *bo;
  26         int src_offset, dst_offset;
  27         int bpp = (afbdev->gfb.base.bits_per_pixel + 7)/8;
  28         int ret = -EBUSY;
  29         bool unmap = false;
  30         bool store_for_later = false;
  31         int x2, y2;
  32         unsigned long flags;
  33
  34         obj = afbdev->gfb.obj;
  35         bo = gem_to_cirrus_bo(obj);
  36
  37         /*
  38          * try and reserve the BO, if we fail with busy
  39          * then the BO is being moved and we should
  40          * store up the damage until later.
  41          */
  42         if (drm_can_sleep())
  43                 ret = cirrus_bo_reserve(bo, true);
  44         if (ret) {
  45                 if (ret != -EBUSY)
  46                         return;
  47                 store_for_later = true;
  48         }
  49
  50         x2 = x + width - 1;
  51         y2 = y + height - 1;
  52         spin_lock_irqsave(&afbdev->dirty_lock, flags);
  53
  54         if (afbdev->y1 < y)
  55                 y = afbdev->y1;
  56         if (afbdev->y2 > y2)
  57                 y2 = afbdev->y2;
  58         if (afbdev->x1 < x)
  59                 x = afbdev->x1;
  60         if (afbdev->x2 > x2)
  61                 x2 = afbdev->x2;
  62
  63         if (store_for_later) {
  64                 afbdev->x1 = x;
  65                 afbdev->x2 = x2;
  66                 afbdev->y1 = y;
  67                 afbdev->y2 = y2;
  68                 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  69                 return;
  70         }
  71
  72         afbdev->x1 = afbdev->y1 = INT_MAX;
  73         afbdev->x2 = afbdev->y2 = 0;
  74         spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  75
  76         if (!bo->kmap.virtual) {
  77                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  78                 if (ret) {
  79                         DRM_ERROR("failed to kmap fb updates\n");
  80                         cirrus_bo_unreserve(bo);
  81                         return;
  82                 }
  83                 unmap = true;
  84         }
  85         for (i = y; i < y + height; i++) {
  86                 /* assume equal stride for now */
  87                 src_offset = dst_offset = i * afbdev->gfb.base.pitches[0] + (x * bpp);
  88                 memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);
  89
  90         }
  91         if (unmap)
  92                 ttm_bo_kunmap(&bo->kmap);
  93
  94         cirrus_bo_unreserve(bo);
  95 }
  96
  97 static void cirrus_fillrect(struct fb_info *info,
  98                          const struct fb_fillrect *rect)
  99 {
 100         struct cirrus_fbdev *afbdev = info->par;
 101         drm_fb_helper_sys_fillrect(info, rect);
 102         cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
 103                          rect->height);
 104 }
 105
 106 static void cirrus_copyarea(struct fb_info *info,
 107                          const struct fb_copyarea *area)
 108 {
 109         struct cirrus_fbdev *afbdev = info->par;
 110         drm_fb_helper_sys_copyarea(info, area);
 111         cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
 112                          area->height);
 113 }
 114
 115 static void cirrus_imageblit(struct fb_info *info,
 116                           const struct fb_image *image)
 117 {
 118         struct cirrus_fbdev *afbdev = info->par;
 119         drm_fb_helper_sys_imageblit(info, image);
 120         cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
 121                          image->height);
 122 }
 123
 124
 125 static struct fb_ops cirrusfb_ops = {
 126         .owner = THIS_MODULE,
 127         .fb_check_var = drm_fb_helper_check_var,
 128         .fb_set_par = drm_fb_helper_set_par,
 129         .fb_fillrect = cirrus_fillrect,
 130         .fb_copyarea = cirrus_copyarea,
 131         .fb_imageblit = cirrus_imageblit,
 132         .fb_pan_display = drm_fb_helper_pan_display,
 133         .fb_blank = drm_fb_helper_blank,
 134         .fb_setcmap = drm_fb_helper_setcmap,
 135 };
 136
 137 static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
 138                                const struct drm_mode_fb_cmd2 *mode_cmd,
 139                                struct drm_gem_object **gobj_p)
 140 {
 141         struct drm_device *dev = afbdev->helper.dev;
 142         struct cirrus_device *cdev = dev->dev_private;
 143         u32 bpp, depth;
 144         u32 size;
 145         struct drm_gem_object *gobj;
 146
 147         int ret = 0;
 148         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
 149
 150         if (!cirrus_check_framebuffer(cdev, mode_cmd->width, mode_cmd->height,
 151                                       bpp, mode_cmd->pitches[0]))
 152                 return -EINVAL;
 153
 154         size = mode_cmd->pitches[0] * mode_cmd->height;
 155         ret = cirrus_gem_create(dev, size, true, &gobj);
 156         if (ret)
 157                 return ret;
 158
 159         *gobj_p = gobj;
 160         return ret;
 161 }
 162
 163 static int cirrusfb_create(struct drm_fb_helper *helper,
 164                            struct drm_fb_helper_surface_size *sizes)
 165 {
 166         struct cirrus_fbdev *gfbdev =
 167                 container_of(helper, struct cirrus_fbdev, helper);
 168         struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
 169         struct fb_info *info;
 170         struct drm_framebuffer *fb;
 171         struct drm_mode_fb_cmd2 mode_cmd;
 172         void *sysram;
 173         struct drm_gem_object *gobj = NULL;
 174         struct cirrus_bo *bo = NULL;
 175         int size, ret;
 176
 177         mode_cmd.width = sizes->surface_width;
 178         mode_cmd.height = sizes->surface_height;
 179         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 180         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 181                                                           sizes->surface_depth);
 182         size = mode_cmd.pitches[0] * mode_cmd.height;
 183
 184         ret = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
 185         if (ret) {
 186                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 187                 return ret;
 188         }
 189
 190         bo = gem_to_cirrus_bo(gobj);
 191
 192         sysram = vmalloc(size);
 193         if (!sysram)
 194                 return -ENOMEM;
 195
 196         info = drm_fb_helper_alloc_fbi(helper);
 197         if (IS_ERR(info))
 198                 return PTR_ERR(info);
 199
 200         info->par = gfbdev;
 201
 202         ret = cirrus_framebuffer_init(cdev->dev, &gfbdev->gfb, &mode_cmd, gobj);
 203         if (ret)
 204                 return ret;
 205
 206         gfbdev->sysram = sysram;
 207         gfbdev->size = size;
 208
 209         fb = &gfbdev->gfb.base;
 210         if (!fb) {
 211                 DRM_INFO("fb is NULL\n");
 212                 return -EINVAL;
 213         }
 214
 215         /* setup helper */
 216         gfbdev->helper.fb = fb;
 217
 218         strcpy(info->fix.id, "cirrusdrmfb");
 219
 220         info->flags = FBINFO_DEFAULT;
 221         info->fbops = &cirrusfb_ops;
 222
 223         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 224         drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
 225                                sizes->fb_height);
 226
 227         /* setup aperture base/size for vesafb takeover */
 228         info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
 229         info->apertures->ranges[0].size = cdev->mc.vram_size;
 230
 231         info->fix.smem_start = cdev->dev->mode_config.fb_base;
 232         info->fix.smem_len = cdev->mc.vram_size;
 233
 234         info->screen_base = sysram;
 235         info->screen_size = size;
 236
 237         info->fix.mmio_start = 0;
 238         info->fix.mmio_len = 0;
 239
 240         DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
 241         DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
 242         DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
 243         DRM_INFO("fb depth is %d\n", fb->depth);
 244         DRM_INFO("   pitch is %d\n", fb->pitches[0]);
 245
 246         return 0;
 247 }
 248
 249 static int cirrus_fbdev_destroy(struct drm_device *dev,
 250                                 struct cirrus_fbdev *gfbdev)
 251 {
 252         struct cirrus_framebuffer *gfb = &gfbdev->gfb;
 253
 254         drm_fb_helper_unregister_fbi(&gfbdev->helper);
 255         drm_fb_helper_release_fbi(&gfbdev->helper);
 256
 257         if (gfb->obj) {
 258                 drm_gem_object_unreference_unlocked(gfb->obj);
 259                 gfb->obj = NULL;
 260         }
 261
 262         vfree(gfbdev->sysram);
 263         drm_fb_helper_fini(&gfbdev->helper);
 264         drm_framebuffer_unregister_private(&gfb->base);
 265         drm_framebuffer_cleanup(&gfb->base);
 266
 267         return 0;
 268 }
 269
 270 static const struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
 271         .gamma_set = cirrus_crtc_fb_gamma_set,
 272         .gamma_get = cirrus_crtc_fb_gamma_get,
 273         .fb_probe = cirrusfb_create,
 274 };
 275
 276 int cirrus_fbdev_init(struct cirrus_device *cdev)
 277 {
 278         struct cirrus_fbdev *gfbdev;
 279         int ret;
 280         int bpp_sel = 24;
 281
 282         /*bpp_sel = 8;*/
 283         gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
 284         if (!gfbdev)
 285                 return -ENOMEM;
 286
 287         cdev->mode_info.gfbdev = gfbdev;
 288         spin_lock_init(&gfbdev->dirty_lock);
 289
 290         drm_fb_helper_prepare(cdev->dev, &gfbdev->helper,
 291                               &cirrus_fb_helper_funcs);
 292
 293         ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
 294                                  cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
 295         if (ret)
 296                 return ret;
 297
 298         ret = drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
 299         if (ret)
 300                 return ret;
 301
 302         /* disable all the possible outputs/crtcs before entering KMS mode */
 303         drm_helper_disable_unused_functions(cdev->dev);
 304
 305         return drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
 306 }
 307
 308 void cirrus_fbdev_fini(struct cirrus_device *cdev)
 309 {
 310         if (!cdev->mode_info.gfbdev)
 311                 return;
 312
 313         cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
 314         kfree(cdev->mode_info.gfbdev);
 315         cdev->mode_info.gfbdev = NULL;
 316 }