drivers/gpu/drm/ast/ast_fb.c

   1 /*
   2  * Copyright 2012 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sub license, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  13  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  15  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  16  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  17  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  18  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  19  *
  20  * The above copyright notice and this permission notice (including the
  21  * next paragraph) shall be included in all copies or substantial portions
  22  * of the Software.
  23  *
  24  */
  25 /*
  26  * Authors: Dave Airlie <airlied@redhat.com>
  27  */
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/errno.h>
  31 #include <linux/string.h>
  32 #include <linux/mm.h>
  33 #include <linux/tty.h>
  34 #include <linux/sysrq.h>
  35 #include <linux/delay.h>
  36 #include <linux/init.h>
  37
  38
  39 #include <drm/drmP.h>
  40 #include <drm/drm_crtc.h>
  41 #include <drm/drm_fb_helper.h>
  42 #include <drm/drm_util.h>
  43 #include <drm/drm_crtc_helper.h>
  44
  45 #include "ast_drv.h"
  46
  47 static void ast_dirty_update(struct ast_fbdev *afbdev,
  48                              int x, int y, int width, int height)
  49 {
  50         int i;
  51         struct drm_gem_object *obj;
  52         struct drm_gem_vram_object *gbo;
  53         int src_offset, dst_offset;
  54         int bpp = afbdev->afb.base.format->cpp[0];
  55         int ret = -EBUSY;
  56         u8 *dst;
  57         bool unmap = false;
  58         bool store_for_later = false;
  59         int x2, y2;
  60         unsigned long flags;
  61
  62         obj = afbdev->afb.obj;
  63         gbo = drm_gem_vram_of_gem(obj);
  64
  65         /*
  66          * try and reserve the BO, if we fail with busy
  67          * then the BO is being moved and we should
  68          * store up the damage until later.
  69          */
  70         if (drm_can_sleep())
  71                 ret = drm_gem_vram_reserve(gbo, true);
  72         if (ret) {
  73                 if (ret != -EBUSY)
  74                         return;
  75
  76                 store_for_later = true;
  77         }
  78
  79         x2 = x + width - 1;
  80         y2 = y + height - 1;
  81         spin_lock_irqsave(&afbdev->dirty_lock, flags);
  82
  83         if (afbdev->y1 < y)
  84                 y = afbdev->y1;
  85         if (afbdev->y2 > y2)
  86                 y2 = afbdev->y2;
  87         if (afbdev->x1 < x)
  88                 x = afbdev->x1;
  89         if (afbdev->x2 > x2)
  90                 x2 = afbdev->x2;
  91
  92         if (store_for_later) {
  93                 afbdev->x1 = x;
  94                 afbdev->x2 = x2;
  95                 afbdev->y1 = y;
  96                 afbdev->y2 = y2;
  97                 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  98                 return;
  99         }
 100
 101         afbdev->x1 = afbdev->y1 = INT_MAX;
 102         afbdev->x2 = afbdev->y2 = 0;
 103         spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 104
 105         dst = drm_gem_vram_kmap(gbo, false, NULL);
 106         if (IS_ERR(dst)) {
 107                 DRM_ERROR("failed to kmap fb updates\n");
 108                 goto out;
 109         } else if (!dst) {
 110                 dst = drm_gem_vram_kmap(gbo, true, NULL);
 111                 if (IS_ERR(dst)) {
 112                         DRM_ERROR("failed to kmap fb updates\n");
 113                         goto out;
 114                 }
 115                 unmap = true;
 116         }
 117
 118         for (i = y; i <= y2; i++) {
 119                 /* assume equal stride for now */
 120                 src_offset = dst_offset =
 121                         i * afbdev->afb.base.pitches[0] + (x * bpp);
 122                 memcpy_toio(dst + dst_offset, afbdev->sysram + src_offset,
 123                             (x2 - x + 1) * bpp);
 124         }
 125
 126         if (unmap)
 127                 drm_gem_vram_kunmap(gbo);
 128
 129 out:
 130         drm_gem_vram_unreserve(gbo);
 131 }
 132
 133 static void ast_fillrect(struct fb_info *info,
 134                          const struct fb_fillrect *rect)
 135 {
 136         struct ast_fbdev *afbdev = info->par;
 137         drm_fb_helper_sys_fillrect(info, rect);
 138         ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
 139                          rect->height);
 140 }
 141
 142 static void ast_copyarea(struct fb_info *info,
 143                          const struct fb_copyarea *area)
 144 {
 145         struct ast_fbdev *afbdev = info->par;
 146         drm_fb_helper_sys_copyarea(info, area);
 147         ast_dirty_update(afbdev, area->dx, area->dy, area->width,
 148                          area->height);
 149 }
 150
 151 static void ast_imageblit(struct fb_info *info,
 152                           const struct fb_image *image)
 153 {
 154         struct ast_fbdev *afbdev = info->par;
 155         drm_fb_helper_sys_imageblit(info, image);
 156         ast_dirty_update(afbdev, image->dx, image->dy, image->width,
 157                          image->height);
 158 }
 159
 160 static struct fb_ops astfb_ops = {
 161         .owner = THIS_MODULE,
 162         .fb_check_var = drm_fb_helper_check_var,
 163         .fb_set_par = drm_fb_helper_set_par,
 164         .fb_fillrect = ast_fillrect,
 165         .fb_copyarea = ast_copyarea,
 166         .fb_imageblit = ast_imageblit,
 167         .fb_pan_display = drm_fb_helper_pan_display,
 168         .fb_blank = drm_fb_helper_blank,
 169         .fb_setcmap = drm_fb_helper_setcmap,
 170         .fb_debug_enter = drm_fb_helper_debug_enter,
 171         .fb_debug_leave = drm_fb_helper_debug_leave,
 172 };
 173
 174 static int astfb_create_object(struct ast_fbdev *afbdev,
 175                                const struct drm_mode_fb_cmd2 *mode_cmd,
 176                                struct drm_gem_object **gobj_p)
 177 {
 178         struct drm_device *dev = afbdev->helper.dev;
 179         u32 size;
 180         struct drm_gem_object *gobj;
 181         int ret = 0;
 182
 183         size = mode_cmd->pitches[0] * mode_cmd->height;
 184         ret = ast_gem_create(dev, size, true, &gobj);
 185         if (ret)
 186                 return ret;
 187
 188         *gobj_p = gobj;
 189         return ret;
 190 }
 191
 192 static int astfb_create(struct drm_fb_helper *helper,
 193                         struct drm_fb_helper_surface_size *sizes)
 194 {
 195         struct ast_fbdev *afbdev =
 196                 container_of(helper, struct ast_fbdev, helper);
 197         struct drm_device *dev = afbdev->helper.dev;
 198         struct drm_mode_fb_cmd2 mode_cmd;
 199         struct drm_framebuffer *fb;
 200         struct fb_info *info;
 201         int size, ret;
 202         void *sysram;
 203         struct drm_gem_object *gobj = NULL;
 204         mode_cmd.width = sizes->surface_width;
 205         mode_cmd.height = sizes->surface_height;
 206         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);
 207
 208         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 209                                                           sizes->surface_depth);
 210
 211         size = mode_cmd.pitches[0] * mode_cmd.height;
 212
 213         ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
 214         if (ret) {
 215                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 216                 return ret;
 217         }
 218
 219         sysram = vmalloc(size);
 220         if (!sysram)
 221                 return -ENOMEM;
 222
 223         info = drm_fb_helper_alloc_fbi(helper);
 224         if (IS_ERR(info)) {
 225                 ret = PTR_ERR(info);
 226                 goto out;
 227         }
 228         ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
 229         if (ret)
 230                 goto out;
 231
 232         afbdev->sysram = sysram;
 233         afbdev->size = size;
 234
 235         fb = &afbdev->afb.base;
 236         afbdev->helper.fb = fb;
 237
 238         info->fbops = &astfb_ops;
 239
 240         info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
 241         info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
 242
 243         drm_fb_helper_fill_info(info, &afbdev->helper, sizes);
 244
 245         info->screen_base = sysram;
 246         info->screen_size = size;
 247
 248         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 249
 250         DRM_DEBUG_KMS("allocated %dx%d\n",
 251                       fb->width, fb->height);
 252
 253         return 0;
 254
 255 out:
 256         vfree(sysram);
 257         return ret;
 258 }
 259
 260 static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
 261         .fb_probe = astfb_create,
 262 };
 263
 264 static void ast_fbdev_destroy(struct drm_device *dev,
 265                               struct ast_fbdev *afbdev)
 266 {
 267         struct ast_framebuffer *afb = &afbdev->afb;
 268
 269         drm_helper_force_disable_all(dev);
 270         drm_fb_helper_unregister_fbi(&afbdev->helper);
 271
 272         if (afb->obj) {
 273                 drm_gem_object_put_unlocked(afb->obj);
 274                 afb->obj = NULL;
 275         }
 276         drm_fb_helper_fini(&afbdev->helper);
 277
 278         vfree(afbdev->sysram);
 279         drm_framebuffer_unregister_private(&afb->base);
 280         drm_framebuffer_cleanup(&afb->base);
 281 }
 282
 283 int ast_fbdev_init(struct drm_device *dev)
 284 {
 285         struct ast_private *ast = dev->dev_private;
 286         struct ast_fbdev *afbdev;
 287         int ret;
 288
 289         afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
 290         if (!afbdev)
 291                 return -ENOMEM;
 292
 293         ast->fbdev = afbdev;
 294         spin_lock_init(&afbdev->dirty_lock);
 295
 296         drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);
 297
 298         ret = drm_fb_helper_init(dev, &afbdev->helper, 1);
 299         if (ret)
 300                 goto free;
 301
 302         ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
 303         if (ret)
 304                 goto fini;
 305
 306         /* disable all the possible outputs/crtcs before entering KMS mode */
 307         drm_helper_disable_unused_functions(dev);
 308
 309         ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
 310         if (ret)
 311                 goto fini;
 312
 313         return 0;
 314
 315 fini:
 316         drm_fb_helper_fini(&afbdev->helper);
 317 free:
 318         kfree(afbdev);
 319         return ret;
 320 }
 321
 322 void ast_fbdev_fini(struct drm_device *dev)
 323 {
 324         struct ast_private *ast = dev->dev_private;
 325
 326         if (!ast->fbdev)
 327                 return;
 328
 329         ast_fbdev_destroy(dev, ast->fbdev);
 330         kfree(ast->fbdev);
 331         ast->fbdev = NULL;
 332 }
 333
 334 void ast_fbdev_set_suspend(struct drm_device *dev, int state)
 335 {
 336         struct ast_private *ast = dev->dev_private;
 337
 338         if (!ast->fbdev)
 339                 return;
 340
 341         drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
 342 }
 343
 344 void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
 345 {
 346         ast->fbdev->helper.fbdev->fix.smem_start =
 347                 ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
 348         ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
 349 }