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         bool unmap = false;
  57         bool store_for_later = false;
  58         int x2, y2;
  59         unsigned long flags;
  60
  61         obj = afbdev->afb.obj;
  62         gbo = drm_gem_vram_of_gem(obj);
  63
  64         /*
  65          * try and reserve the BO, if we fail with busy
  66          * then the BO is being moved and we should
  67          * store up the damage until later.
  68          */
  69         if (drm_can_sleep())
  70                 ret = drm_gem_vram_reserve(gbo, true);
  71         if (ret) {
  72                 if (ret != -EBUSY)
  73                         return;
  74
  75                 store_for_later = true;
  76         }
  77
  78         x2 = x + width - 1;
  79         y2 = y + height - 1;
  80         spin_lock_irqsave(&afbdev->dirty_lock, flags);
  81
  82         if (afbdev->y1 < y)
  83                 y = afbdev->y1;
  84         if (afbdev->y2 > y2)
  85                 y2 = afbdev->y2;
  86         if (afbdev->x1 < x)
  87                 x = afbdev->x1;
  88         if (afbdev->x2 > x2)
  89                 x2 = afbdev->x2;
  90
  91         if (store_for_later) {
  92                 afbdev->x1 = x;
  93                 afbdev->x2 = x2;
  94                 afbdev->y1 = y;
  95                 afbdev->y2 = y2;
  96                 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  97                 return;
  98         }
  99
 100         afbdev->x1 = afbdev->y1 = INT_MAX;
 101         afbdev->x2 = afbdev->y2 = 0;
 102         spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 103
 104         if (!gbo->kmap.virtual) {
 105                 ret = ttm_bo_kmap(&gbo->bo, 0, gbo->bo.num_pages, &gbo->kmap);
 106                 if (ret) {
 107                         DRM_ERROR("failed to kmap fb updates\n");
 108                         drm_gem_vram_unreserve(gbo);
 109                         return;
 110                 }
 111                 unmap = true;
 112         }
 113         for (i = y; i <= y2; i++) {
 114                 /* assume equal stride for now */
 115                 src_offset = dst_offset =
 116                         i * afbdev->afb.base.pitches[0] + (x * bpp);
 117                 memcpy_toio(gbo->kmap.virtual + src_offset,
 118                             afbdev->sysram + dst_offset,
 119                             (x2 - x + 1) * bpp);
 120
 121         }
 122         if (unmap)
 123                 ttm_bo_kunmap(&gbo->kmap);
 124
 125         drm_gem_vram_unreserve(gbo);
 126 }
 127
 128 static void ast_fillrect(struct fb_info *info,
 129                          const struct fb_fillrect *rect)
 130 {
 131         struct ast_fbdev *afbdev = info->par;
 132         drm_fb_helper_sys_fillrect(info, rect);
 133         ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
 134                          rect->height);
 135 }
 136
 137 static void ast_copyarea(struct fb_info *info,
 138                          const struct fb_copyarea *area)
 139 {
 140         struct ast_fbdev *afbdev = info->par;
 141         drm_fb_helper_sys_copyarea(info, area);
 142         ast_dirty_update(afbdev, area->dx, area->dy, area->width,
 143                          area->height);
 144 }
 145
 146 static void ast_imageblit(struct fb_info *info,
 147                           const struct fb_image *image)
 148 {
 149         struct ast_fbdev *afbdev = info->par;
 150         drm_fb_helper_sys_imageblit(info, image);
 151         ast_dirty_update(afbdev, image->dx, image->dy, image->width,
 152                          image->height);
 153 }
 154
 155 static struct fb_ops astfb_ops = {
 156         .owner = THIS_MODULE,
 157         .fb_check_var = drm_fb_helper_check_var,
 158         .fb_set_par = drm_fb_helper_set_par,
 159         .fb_fillrect = ast_fillrect,
 160         .fb_copyarea = ast_copyarea,
 161         .fb_imageblit = ast_imageblit,
 162         .fb_pan_display = drm_fb_helper_pan_display,
 163         .fb_blank = drm_fb_helper_blank,
 164         .fb_setcmap = drm_fb_helper_setcmap,
 165         .fb_debug_enter = drm_fb_helper_debug_enter,
 166         .fb_debug_leave = drm_fb_helper_debug_leave,
 167 };
 168
 169 static int astfb_create_object(struct ast_fbdev *afbdev,
 170                                const struct drm_mode_fb_cmd2 *mode_cmd,
 171                                struct drm_gem_object **gobj_p)
 172 {
 173         struct drm_device *dev = afbdev->helper.dev;
 174         u32 size;
 175         struct drm_gem_object *gobj;
 176         int ret = 0;
 177
 178         size = mode_cmd->pitches[0] * mode_cmd->height;
 179         ret = ast_gem_create(dev, size, true, &gobj);
 180         if (ret)
 181                 return ret;
 182
 183         *gobj_p = gobj;
 184         return ret;
 185 }
 186
 187 static int astfb_create(struct drm_fb_helper *helper,
 188                         struct drm_fb_helper_surface_size *sizes)
 189 {
 190         struct ast_fbdev *afbdev =
 191                 container_of(helper, struct ast_fbdev, helper);
 192         struct drm_device *dev = afbdev->helper.dev;
 193         struct drm_mode_fb_cmd2 mode_cmd;
 194         struct drm_framebuffer *fb;
 195         struct fb_info *info;
 196         int size, ret;
 197         void *sysram;
 198         struct drm_gem_object *gobj = NULL;
 199         mode_cmd.width = sizes->surface_width;
 200         mode_cmd.height = sizes->surface_height;
 201         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);
 202
 203         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 204                                                           sizes->surface_depth);
 205
 206         size = mode_cmd.pitches[0] * mode_cmd.height;
 207
 208         ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
 209         if (ret) {
 210                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 211                 return ret;
 212         }
 213
 214         sysram = vmalloc(size);
 215         if (!sysram)
 216                 return -ENOMEM;
 217
 218         info = drm_fb_helper_alloc_fbi(helper);
 219         if (IS_ERR(info)) {
 220                 ret = PTR_ERR(info);
 221                 goto out;
 222         }
 223         ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
 224         if (ret)
 225                 goto out;
 226
 227         afbdev->sysram = sysram;
 228         afbdev->size = size;
 229
 230         fb = &afbdev->afb.base;
 231         afbdev->helper.fb = fb;
 232
 233         info->fbops = &astfb_ops;
 234
 235         info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
 236         info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
 237
 238         drm_fb_helper_fill_info(info, &afbdev->helper, sizes);
 239
 240         info->screen_base = sysram;
 241         info->screen_size = size;
 242
 243         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 244
 245         DRM_DEBUG_KMS("allocated %dx%d\n",
 246                       fb->width, fb->height);
 247
 248         return 0;
 249
 250 out:
 251         vfree(sysram);
 252         return ret;
 253 }
 254
 255 static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
 256         .fb_probe = astfb_create,
 257 };
 258
 259 static void ast_fbdev_destroy(struct drm_device *dev,
 260                               struct ast_fbdev *afbdev)
 261 {
 262         struct ast_framebuffer *afb = &afbdev->afb;
 263
 264         drm_helper_force_disable_all(dev);
 265         drm_fb_helper_unregister_fbi(&afbdev->helper);
 266
 267         if (afb->obj) {
 268                 drm_gem_object_put_unlocked(afb->obj);
 269                 afb->obj = NULL;
 270         }
 271         drm_fb_helper_fini(&afbdev->helper);
 272
 273         vfree(afbdev->sysram);
 274         drm_framebuffer_unregister_private(&afb->base);
 275         drm_framebuffer_cleanup(&afb->base);
 276 }
 277
 278 int ast_fbdev_init(struct drm_device *dev)
 279 {
 280         struct ast_private *ast = dev->dev_private;
 281         struct ast_fbdev *afbdev;
 282         int ret;
 283
 284         afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
 285         if (!afbdev)
 286                 return -ENOMEM;
 287
 288         ast->fbdev = afbdev;
 289         spin_lock_init(&afbdev->dirty_lock);
 290
 291         drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);
 292
 293         ret = drm_fb_helper_init(dev, &afbdev->helper, 1);
 294         if (ret)
 295                 goto free;
 296
 297         ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
 298         if (ret)
 299                 goto fini;
 300
 301         /* disable all the possible outputs/crtcs before entering KMS mode */
 302         drm_helper_disable_unused_functions(dev);
 303
 304         ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
 305         if (ret)
 306                 goto fini;
 307
 308         return 0;
 309
 310 fini:
 311         drm_fb_helper_fini(&afbdev->helper);
 312 free:
 313         kfree(afbdev);
 314         return ret;
 315 }
 316
 317 void ast_fbdev_fini(struct drm_device *dev)
 318 {
 319         struct ast_private *ast = dev->dev_private;
 320
 321         if (!ast->fbdev)
 322                 return;
 323
 324         ast_fbdev_destroy(dev, ast->fbdev);
 325         kfree(ast->fbdev);
 326         ast->fbdev = NULL;
 327 }
 328
 329 void ast_fbdev_set_suspend(struct drm_device *dev, int state)
 330 {
 331         struct ast_private *ast = dev->dev_private;
 332
 333         if (!ast->fbdev)
 334                 return;
 335
 336         drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
 337 }
 338
 339 void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
 340 {
 341         ast->fbdev->helper.fbdev->fix.smem_start =
 342                 ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
 343         ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
 344 }