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;
  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         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.base.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         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         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         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                                struct drm_mode_fb_cmd2 *mode_cmd,
 138                                struct drm_gem_object **gobj_p)
 139 {
 140         struct drm_device *dev = afbdev->helper.dev;
 141         u32 bpp, depth;
 142         u32 size;
 143         struct drm_gem_object *gobj;
 144
 145         int ret = 0;
 146         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
 147
 148         if (bpp > 24)
 149                 return -EINVAL;
 150         size = mode_cmd->pitches[0] * mode_cmd->height;
 151         ret = cirrus_gem_create(dev, size, true, &gobj);
 152         if (ret)
 153                 return ret;
 154
 155         *gobj_p = gobj;
 156         return ret;
 157 }
 158
 159 static int cirrusfb_create(struct drm_fb_helper *helper,
 160                            struct drm_fb_helper_surface_size *sizes)
 161 {
 162         struct cirrus_fbdev *gfbdev = (struct cirrus_fbdev *)helper;
 163         struct drm_device *dev = gfbdev->helper.dev;
 164         struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
 165         struct fb_info *info;
 166         struct drm_framebuffer *fb;
 167         struct drm_mode_fb_cmd2 mode_cmd;
 168         struct device *device = &dev->pdev->dev;
 169         void *sysram;
 170         struct drm_gem_object *gobj = NULL;
 171         struct cirrus_bo *bo = NULL;
 172         int size, ret;
 173
 174         mode_cmd.width = sizes->surface_width;
 175         mode_cmd.height = sizes->surface_height;
 176         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 177         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 178                                                           sizes->surface_depth);
 179         size = mode_cmd.pitches[0] * mode_cmd.height;
 180
 181         ret = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
 182         if (ret) {
 183                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 184                 return ret;
 185         }
 186
 187         bo = gem_to_cirrus_bo(gobj);
 188
 189         sysram = vmalloc(size);
 190         if (!sysram)
 191                 return -ENOMEM;
 192
 193         info = framebuffer_alloc(0, device);
 194         if (info == NULL)
 195                 return -ENOMEM;
 196
 197         info->par = gfbdev;
 198
 199         ret = cirrus_framebuffer_init(cdev->dev, &gfbdev->gfb, &mode_cmd, gobj);
 200         if (ret)
 201                 return ret;
 202
 203         gfbdev->sysram = sysram;
 204         gfbdev->size = size;
 205
 206         fb = &gfbdev->gfb.base;
 207         if (!fb) {
 208                 DRM_INFO("fb is NULL\n");
 209                 return -EINVAL;
 210         }
 211
 212         /* setup helper */
 213         gfbdev->helper.fb = fb;
 214         gfbdev->helper.fbdev = info;
 215
 216         strcpy(info->fix.id, "cirrusdrmfb");
 217
 218
 219         info->flags = FBINFO_DEFAULT;
 220         info->fbops = &cirrusfb_ops;
 221
 222         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 223         drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
 224                                sizes->fb_height);
 225
 226         /* setup aperture base/size for vesafb takeover */
 227         info->apertures = alloc_apertures(1);
 228         if (!info->apertures) {
 229                 ret = -ENOMEM;
 230                 goto out_iounmap;
 231         }
 232         info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
 233         info->apertures->ranges[0].size = cdev->mc.vram_size;
 234
 235         info->screen_base = sysram;
 236         info->screen_size = size;
 237
 238         info->fix.mmio_start = 0;
 239         info->fix.mmio_len = 0;
 240
 241         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 242         if (ret) {
 243                 DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
 244                 ret = -ENOMEM;
 245                 goto out_iounmap;
 246         }
 247
 248         DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
 249         DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
 250         DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
 251         DRM_INFO("fb depth is %d\n", fb->depth);
 252         DRM_INFO("   pitch is %d\n", fb->pitches[0]);
 253
 254         return 0;
 255 out_iounmap:
 256         return ret;
 257 }
 258
 259 static int cirrus_fbdev_destroy(struct drm_device *dev,
 260                                 struct cirrus_fbdev *gfbdev)
 261 {
 262         struct fb_info *info;
 263         struct cirrus_framebuffer *gfb = &gfbdev->gfb;
 264
 265         if (gfbdev->helper.fbdev) {
 266                 info = gfbdev->helper.fbdev;
 267
 268                 unregister_framebuffer(info);
 269                 if (info->cmap.len)
 270                         fb_dealloc_cmap(&info->cmap);
 271                 framebuffer_release(info);
 272         }
 273
 274         if (gfb->obj) {
 275                 drm_gem_object_unreference_unlocked(gfb->obj);
 276                 gfb->obj = NULL;
 277         }
 278
 279         vfree(gfbdev->sysram);
 280         drm_fb_helper_fini(&gfbdev->helper);
 281         drm_framebuffer_unregister_private(&gfb->base);
 282         drm_framebuffer_cleanup(&gfb->base);
 283
 284         return 0;
 285 }
 286
 287 static struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
 288         .gamma_set = cirrus_crtc_fb_gamma_set,
 289         .gamma_get = cirrus_crtc_fb_gamma_get,
 290         .fb_probe = cirrusfb_create,
 291 };
 292
 293 int cirrus_fbdev_init(struct cirrus_device *cdev)
 294 {
 295         struct cirrus_fbdev *gfbdev;
 296         int ret;
 297         int bpp_sel = 24;
 298
 299         /*bpp_sel = 8;*/
 300         gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
 301         if (!gfbdev)
 302                 return -ENOMEM;
 303
 304         cdev->mode_info.gfbdev = gfbdev;
 305         gfbdev->helper.funcs = &cirrus_fb_helper_funcs;
 306         spin_lock_init(&gfbdev->dirty_lock);
 307
 308         ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
 309                                  cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
 310         if (ret) {
 311                 kfree(gfbdev);
 312                 return ret;
 313         }
 314         drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
 315
 316         /* disable all the possible outputs/crtcs before entering KMS mode */
 317         drm_helper_disable_unused_functions(cdev->dev);
 318         drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
 319
 320         return 0;
 321 }
 322
 323 void cirrus_fbdev_fini(struct cirrus_device *cdev)
 324 {
 325         if (!cdev->mode_info.gfbdev)
 326                 return;
 327
 328         cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
 329         kfree(cdev->mode_info.gfbdev);
 330         cdev->mode_info.gfbdev = NULL;
 331 }