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
  15 #include <linux/fb.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.base.bits_per_pixel + 7)/8;
  27         int ret;
  28         bool unmap = false;
  29
  30         obj = afbdev->gfb.obj;
  31         bo = gem_to_cirrus_bo(obj);
  32
  33         ret = cirrus_bo_reserve(bo, true);
  34         if (ret) {
  35                 DRM_ERROR("failed to reserve fb bo\n");
  36                 return;
  37         }
  38
  39         if (!bo->kmap.virtual) {
  40                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
  41                 if (ret) {
  42                         DRM_ERROR("failed to kmap fb updates\n");
  43                         cirrus_bo_unreserve(bo);
  44                         return;
  45                 }
  46                 unmap = true;
  47         }
  48         for (i = y; i < y + height; i++) {
  49                 /* assume equal stride for now */
  50                 src_offset = dst_offset = i * afbdev->gfb.base.pitches[0] + (x * bpp);
  51                 memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, width * bpp);
  52
  53         }
  54         if (unmap)
  55                 ttm_bo_kunmap(&bo->kmap);
  56
  57         cirrus_bo_unreserve(bo);
  58 }
  59
  60 static void cirrus_fillrect(struct fb_info *info,
  61                          const struct fb_fillrect *rect)
  62 {
  63         struct cirrus_fbdev *afbdev = info->par;
  64         sys_fillrect(info, rect);
  65         cirrus_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
  66                          rect->height);
  67 }
  68
  69 static void cirrus_copyarea(struct fb_info *info,
  70                          const struct fb_copyarea *area)
  71 {
  72         struct cirrus_fbdev *afbdev = info->par;
  73         sys_copyarea(info, area);
  74         cirrus_dirty_update(afbdev, area->dx, area->dy, area->width,
  75                          area->height);
  76 }
  77
  78 static void cirrus_imageblit(struct fb_info *info,
  79                           const struct fb_image *image)
  80 {
  81         struct cirrus_fbdev *afbdev = info->par;
  82         sys_imageblit(info, image);
  83         cirrus_dirty_update(afbdev, image->dx, image->dy, image->width,
  84                          image->height);
  85 }
  86
  87
  88 static struct fb_ops cirrusfb_ops = {
  89         .owner = THIS_MODULE,
  90         .fb_check_var = drm_fb_helper_check_var,
  91         .fb_set_par = drm_fb_helper_set_par,
  92         .fb_fillrect = cirrus_fillrect,
  93         .fb_copyarea = cirrus_copyarea,
  94         .fb_imageblit = cirrus_imageblit,
  95         .fb_pan_display = drm_fb_helper_pan_display,
  96         .fb_blank = drm_fb_helper_blank,
  97         .fb_setcmap = drm_fb_helper_setcmap,
  98 };
  99
 100 static int cirrusfb_create_object(struct cirrus_fbdev *afbdev,
 101                                struct drm_mode_fb_cmd2 *mode_cmd,
 102                                struct drm_gem_object **gobj_p)
 103 {
 104         struct drm_device *dev = afbdev->helper.dev;
 105         u32 bpp, depth;
 106         u32 size;
 107         struct drm_gem_object *gobj;
 108
 109         int ret = 0;
 110         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
 111
 112         if (bpp > 24)
 113                 return -EINVAL;
 114         size = mode_cmd->pitches[0] * mode_cmd->height;
 115         ret = cirrus_gem_create(dev, size, true, &gobj);
 116         if (ret)
 117                 return ret;
 118
 119         *gobj_p = gobj;
 120         return ret;
 121 }
 122
 123 static int cirrusfb_create(struct cirrus_fbdev *gfbdev,
 124                            struct drm_fb_helper_surface_size *sizes)
 125 {
 126         struct drm_device *dev = gfbdev->helper.dev;
 127         struct cirrus_device *cdev = gfbdev->helper.dev->dev_private;
 128         struct fb_info *info;
 129         struct drm_framebuffer *fb;
 130         struct drm_mode_fb_cmd2 mode_cmd;
 131         struct device *device = &dev->pdev->dev;
 132         void *sysram;
 133         struct drm_gem_object *gobj = NULL;
 134         struct cirrus_bo *bo = NULL;
 135         int size, ret;
 136
 137         mode_cmd.width = sizes->surface_width;
 138         mode_cmd.height = sizes->surface_height;
 139         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
 140         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 141                                                           sizes->surface_depth);
 142         size = mode_cmd.pitches[0] * mode_cmd.height;
 143
 144         ret = cirrusfb_create_object(gfbdev, &mode_cmd, &gobj);
 145         if (ret) {
 146                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 147                 return ret;
 148         }
 149
 150         bo = gem_to_cirrus_bo(gobj);
 151
 152         sysram = vmalloc(size);
 153         if (!sysram)
 154                 return -ENOMEM;
 155
 156         info = framebuffer_alloc(0, device);
 157         if (info == NULL)
 158                 return -ENOMEM;
 159
 160         info->par = gfbdev;
 161
 162         ret = cirrus_framebuffer_init(cdev->dev, &gfbdev->gfb, &mode_cmd, gobj);
 163         if (ret)
 164                 return ret;
 165
 166         gfbdev->sysram = sysram;
 167         gfbdev->size = size;
 168
 169         fb = &gfbdev->gfb.base;
 170         if (!fb) {
 171                 DRM_INFO("fb is NULL\n");
 172                 return -EINVAL;
 173         }
 174
 175         /* setup helper */
 176         gfbdev->helper.fb = fb;
 177         gfbdev->helper.fbdev = info;
 178
 179         strcpy(info->fix.id, "cirrusdrmfb");
 180
 181
 182         info->flags = FBINFO_DEFAULT;
 183         info->fbops = &cirrusfb_ops;
 184
 185         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 186         drm_fb_helper_fill_var(info, &gfbdev->helper, sizes->fb_width,
 187                                sizes->fb_height);
 188
 189         /* setup aperture base/size for vesafb takeover */
 190         info->apertures = alloc_apertures(1);
 191         if (!info->apertures) {
 192                 ret = -ENOMEM;
 193                 goto out_iounmap;
 194         }
 195         info->apertures->ranges[0].base = cdev->dev->mode_config.fb_base;
 196         info->apertures->ranges[0].size = cdev->mc.vram_size;
 197
 198         info->screen_base = sysram;
 199         info->screen_size = size;
 200
 201         info->fix.mmio_start = 0;
 202         info->fix.mmio_len = 0;
 203
 204         ret = fb_alloc_cmap(&info->cmap, 256, 0);
 205         if (ret) {
 206                 DRM_ERROR("%s: can't allocate color map\n", info->fix.id);
 207                 ret = -ENOMEM;
 208                 goto out_iounmap;
 209         }
 210
 211         DRM_INFO("fb mappable at 0x%lX\n", info->fix.smem_start);
 212         DRM_INFO("vram aper at 0x%lX\n", (unsigned long)info->fix.smem_start);
 213         DRM_INFO("size %lu\n", (unsigned long)info->fix.smem_len);
 214         DRM_INFO("fb depth is %d\n", fb->depth);
 215         DRM_INFO("   pitch is %d\n", fb->pitches[0]);
 216
 217         return 0;
 218 out_iounmap:
 219         return ret;
 220 }
 221
 222 static int cirrus_fb_find_or_create_single(struct drm_fb_helper *helper,
 223                                            struct drm_fb_helper_surface_size
 224                                            *sizes)
 225 {
 226         struct cirrus_fbdev *gfbdev = (struct cirrus_fbdev *)helper;
 227         int new_fb = 0;
 228         int ret;
 229
 230         if (!helper->fb) {
 231                 ret = cirrusfb_create(gfbdev, sizes);
 232                 if (ret)
 233                         return ret;
 234                 new_fb = 1;
 235         }
 236         return new_fb;
 237 }
 238
 239 static int cirrus_fbdev_destroy(struct drm_device *dev,
 240                                 struct cirrus_fbdev *gfbdev)
 241 {
 242         struct fb_info *info;
 243         struct cirrus_framebuffer *gfb = &gfbdev->gfb;
 244
 245         if (gfbdev->helper.fbdev) {
 246                 info = gfbdev->helper.fbdev;
 247
 248                 unregister_framebuffer(info);
 249                 if (info->cmap.len)
 250                         fb_dealloc_cmap(&info->cmap);
 251                 framebuffer_release(info);
 252         }
 253
 254         if (gfb->obj) {
 255                 drm_gem_object_unreference_unlocked(gfb->obj);
 256                 gfb->obj = NULL;
 257         }
 258
 259         vfree(gfbdev->sysram);
 260         drm_fb_helper_fini(&gfbdev->helper);
 261         drm_framebuffer_cleanup(&gfb->base);
 262
 263         return 0;
 264 }
 265
 266 static struct drm_fb_helper_funcs cirrus_fb_helper_funcs = {
 267         .gamma_set = cirrus_crtc_fb_gamma_set,
 268         .gamma_get = cirrus_crtc_fb_gamma_get,
 269         .fb_probe = cirrus_fb_find_or_create_single,
 270 };
 271
 272 int cirrus_fbdev_init(struct cirrus_device *cdev)
 273 {
 274         struct cirrus_fbdev *gfbdev;
 275         int ret;
 276         int bpp_sel = 24;
 277
 278         /*bpp_sel = 8;*/
 279         gfbdev = kzalloc(sizeof(struct cirrus_fbdev), GFP_KERNEL);
 280         if (!gfbdev)
 281                 return -ENOMEM;
 282
 283         cdev->mode_info.gfbdev = gfbdev;
 284         gfbdev->helper.funcs = &cirrus_fb_helper_funcs;
 285
 286         ret = drm_fb_helper_init(cdev->dev, &gfbdev->helper,
 287                                  cdev->num_crtc, CIRRUSFB_CONN_LIMIT);
 288         if (ret) {
 289                 kfree(gfbdev);
 290                 return ret;
 291         }
 292         drm_fb_helper_single_add_all_connectors(&gfbdev->helper);
 293         drm_fb_helper_initial_config(&gfbdev->helper, bpp_sel);
 294
 295         return 0;
 296 }
 297
 298 void cirrus_fbdev_fini(struct cirrus_device *cdev)
 299 {
 300         if (!cdev->mode_info.gfbdev)
 301                 return;
 302
 303         cirrus_fbdev_destroy(cdev->dev, cdev->mode_info.gfbdev);
 304         kfree(cdev->mode_info.gfbdev);
 305         cdev->mode_info.gfbdev = NULL;
 306 }