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_crtc_helper.h>
  43 #include "ast_drv.h"
  44
  45 static void ast_dirty_update(struct ast_fbdev *afbdev,
  46                              int x, int y, int width, int height)
  47 {
  48         int i;
  49         struct drm_gem_object *obj;
  50         struct ast_bo *bo;
  51         int src_offset, dst_offset;
  52         int bpp = (afbdev->afb.base.bits_per_pixel + 7)/8;
  53         int ret = -EBUSY;
  54         bool unmap = false;
  55         bool store_for_later = false;
  56         int x2, y2;
  57         unsigned long flags;
  58
  59         obj = afbdev->afb.obj;
  60         bo = gem_to_ast_bo(obj);
  61
  62         /*
  63          * try and reserve the BO, if we fail with busy
  64          * then the BO is being moved and we should
  65          * store up the damage until later.
  66          */
  67         if (drm_can_sleep())
  68                 ret = ast_bo_reserve(bo, true);
  69         if (ret) {
  70                 if (ret != -EBUSY)
  71                         return;
  72
  73                 store_for_later = true;
  74         }
  75
  76         x2 = x + width - 1;
  77         y2 = y + height - 1;
  78         spin_lock_irqsave(&afbdev->dirty_lock, flags);
  79
  80         if (afbdev->y1 < y)
  81                 y = afbdev->y1;
  82         if (afbdev->y2 > y2)
  83                 y2 = afbdev->y2;
  84         if (afbdev->x1 < x)
  85                 x = afbdev->x1;
  86         if (afbdev->x2 > x2)
  87                 x2 = afbdev->x2;
  88
  89         if (store_for_later) {
  90                 afbdev->x1 = x;
  91                 afbdev->x2 = x2;
  92                 afbdev->y1 = y;
  93                 afbdev->y2 = y2;
  94                 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  95                 return;
  96         }
  97
  98         afbdev->x1 = afbdev->y1 = INT_MAX;
  99         afbdev->x2 = afbdev->y2 = 0;
 100         spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 101
 102         if (!bo->kmap.virtual) {
 103                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 104                 if (ret) {
 105                         DRM_ERROR("failed to kmap fb updates\n");
 106                         ast_bo_unreserve(bo);
 107                         return;
 108                 }
 109                 unmap = true;
 110         }
 111         for (i = y; i <= y2; i++) {
 112                 /* assume equal stride for now */
 113                 src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
 114                 memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);
 115
 116         }
 117         if (unmap)
 118                 ttm_bo_kunmap(&bo->kmap);
 119
 120         ast_bo_unreserve(bo);
 121 }
 122
 123 static void ast_fillrect(struct fb_info *info,
 124                          const struct fb_fillrect *rect)
 125 {
 126         struct ast_fbdev *afbdev = info->par;
 127         drm_fb_helper_sys_fillrect(info, rect);
 128         ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
 129                          rect->height);
 130 }
 131
 132 static void ast_copyarea(struct fb_info *info,
 133                          const struct fb_copyarea *area)
 134 {
 135         struct ast_fbdev *afbdev = info->par;
 136         drm_fb_helper_sys_copyarea(info, area);
 137         ast_dirty_update(afbdev, area->dx, area->dy, area->width,
 138                          area->height);
 139 }
 140
 141 static void ast_imageblit(struct fb_info *info,
 142                           const struct fb_image *image)
 143 {
 144         struct ast_fbdev *afbdev = info->par;
 145         drm_fb_helper_sys_imageblit(info, image);
 146         ast_dirty_update(afbdev, image->dx, image->dy, image->width,
 147                          image->height);
 148 }
 149
 150 static struct fb_ops astfb_ops = {
 151         .owner = THIS_MODULE,
 152         .fb_check_var = drm_fb_helper_check_var,
 153         .fb_set_par = drm_fb_helper_set_par,
 154         .fb_fillrect = ast_fillrect,
 155         .fb_copyarea = ast_copyarea,
 156         .fb_imageblit = ast_imageblit,
 157         .fb_pan_display = drm_fb_helper_pan_display,
 158         .fb_blank = drm_fb_helper_blank,
 159         .fb_setcmap = drm_fb_helper_setcmap,
 160         .fb_debug_enter = drm_fb_helper_debug_enter,
 161         .fb_debug_leave = drm_fb_helper_debug_leave,
 162 };
 163
 164 static int astfb_create_object(struct ast_fbdev *afbdev,
 165                                const struct drm_mode_fb_cmd2 *mode_cmd,
 166                                struct drm_gem_object **gobj_p)
 167 {
 168         struct drm_device *dev = afbdev->helper.dev;
 169         u32 size;
 170         struct drm_gem_object *gobj;
 171         int ret = 0;
 172
 173         size = mode_cmd->pitches[0] * mode_cmd->height;
 174         ret = ast_gem_create(dev, size, true, &gobj);
 175         if (ret)
 176                 return ret;
 177
 178         *gobj_p = gobj;
 179         return ret;
 180 }
 181
 182 static int astfb_create(struct drm_fb_helper *helper,
 183                         struct drm_fb_helper_surface_size *sizes)
 184 {
 185         struct ast_fbdev *afbdev =
 186                 container_of(helper, struct ast_fbdev, helper);
 187         struct drm_device *dev = afbdev->helper.dev;
 188         struct drm_mode_fb_cmd2 mode_cmd;
 189         struct drm_framebuffer *fb;
 190         struct fb_info *info;
 191         int size, ret;
 192         void *sysram;
 193         struct drm_gem_object *gobj = NULL;
 194         struct ast_bo *bo = NULL;
 195         mode_cmd.width = sizes->surface_width;
 196         mode_cmd.height = sizes->surface_height;
 197         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);
 198
 199         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 200                                                           sizes->surface_depth);
 201
 202         size = mode_cmd.pitches[0] * mode_cmd.height;
 203
 204         ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
 205         if (ret) {
 206                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 207                 return ret;
 208         }
 209         bo = gem_to_ast_bo(gobj);
 210
 211         sysram = vmalloc(size);
 212         if (!sysram)
 213                 return -ENOMEM;
 214
 215         info = drm_fb_helper_alloc_fbi(helper);
 216         if (IS_ERR(info)) {
 217                 ret = PTR_ERR(info);
 218                 goto err_free_vram;
 219         }
 220         info->par = afbdev;
 221
 222         ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
 223         if (ret)
 224                 goto err_release_fbi;
 225
 226         afbdev->sysram = sysram;
 227         afbdev->size = size;
 228
 229         fb = &afbdev->afb.base;
 230         afbdev->helper.fb = fb;
 231
 232         strcpy(info->fix.id, "astdrmfb");
 233
 234         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 235         info->fbops = &astfb_ops;
 236
 237         info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
 238         info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
 239
 240         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 241         drm_fb_helper_fill_var(info, &afbdev->helper, sizes->fb_width, sizes->fb_height);
 242
 243         info->screen_base = sysram;
 244         info->screen_size = size;
 245
 246         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 247
 248         DRM_DEBUG_KMS("allocated %dx%d\n",
 249                       fb->width, fb->height);
 250
 251         return 0;
 252
 253 err_release_fbi:
 254         drm_fb_helper_release_fbi(helper);
 255 err_free_vram:
 256         vfree(afbdev->sysram);
 257         return ret;
 258 }
 259
 260 static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 261                                u16 blue, int regno)
 262 {
 263         struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
 264         ast_crtc->lut_r[regno] = red >> 8;
 265         ast_crtc->lut_g[regno] = green >> 8;
 266         ast_crtc->lut_b[regno] = blue >> 8;
 267 }
 268
 269 static void ast_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 270                                u16 *blue, int regno)
 271 {
 272         struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
 273         *red = ast_crtc->lut_r[regno] << 8;
 274         *green = ast_crtc->lut_g[regno] << 8;
 275         *blue = ast_crtc->lut_b[regno] << 8;
 276 }
 277
 278 static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
 279         .gamma_set = ast_fb_gamma_set,
 280         .gamma_get = ast_fb_gamma_get,
 281         .fb_probe = astfb_create,
 282 };
 283
 284 static void ast_fbdev_destroy(struct drm_device *dev,
 285                               struct ast_fbdev *afbdev)
 286 {
 287         struct ast_framebuffer *afb = &afbdev->afb;
 288
 289         drm_fb_helper_unregister_fbi(&afbdev->helper);
 290         drm_fb_helper_release_fbi(&afbdev->helper);
 291
 292         if (afb->obj) {
 293                 drm_gem_object_unreference_unlocked(afb->obj);
 294                 afb->obj = NULL;
 295         }
 296         drm_fb_helper_fini(&afbdev->helper);
 297
 298         vfree(afbdev->sysram);
 299         drm_framebuffer_unregister_private(&afb->base);
 300         drm_framebuffer_cleanup(&afb->base);
 301 }
 302
 303 int ast_fbdev_init(struct drm_device *dev)
 304 {
 305         struct ast_private *ast = dev->dev_private;
 306         struct ast_fbdev *afbdev;
 307         int ret;
 308
 309         afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
 310         if (!afbdev)
 311                 return -ENOMEM;
 312
 313         ast->fbdev = afbdev;
 314         spin_lock_init(&afbdev->dirty_lock);
 315
 316         drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);
 317
 318         ret = drm_fb_helper_init(dev, &afbdev->helper,
 319                                  1, 1);
 320         if (ret)
 321                 goto free;
 322
 323         ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
 324         if (ret)
 325                 goto fini;
 326
 327         /* disable all the possible outputs/crtcs before entering KMS mode */
 328         drm_helper_disable_unused_functions(dev);
 329
 330         ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
 331         if (ret)
 332                 goto fini;
 333
 334         return 0;
 335
 336 fini:
 337         drm_fb_helper_fini(&afbdev->helper);
 338 free:
 339         kfree(afbdev);
 340         return ret;
 341 }
 342
 343 void ast_fbdev_fini(struct drm_device *dev)
 344 {
 345         struct ast_private *ast = dev->dev_private;
 346
 347         if (!ast->fbdev)
 348                 return;
 349
 350         ast_fbdev_destroy(dev, ast->fbdev);
 351         kfree(ast->fbdev);
 352         ast->fbdev = NULL;
 353 }
 354
 355 void ast_fbdev_set_suspend(struct drm_device *dev, int state)
 356 {
 357         struct ast_private *ast = dev->dev_private;
 358
 359         if (!ast->fbdev)
 360                 return;
 361
 362         drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
 363 }
 364
 365 void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
 366 {
 367         ast->fbdev->helper.fbdev->fix.smem_start =
 368                 ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
 369         ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
 370 }