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