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