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/fb.h>
  37 #include <linux/init.h>
  38
  39
  40 #include <drm/drmP.h>
  41 #include <drm/drm_crtc.h>
  42 #include <drm/drm_fb_helper.h>
  43 #include <drm/drm_crtc_helper.h>
  44 #include "ast_drv.h"
  45
  46 static void ast_dirty_update(struct ast_fbdev *afbdev,
  47                              int x, int y, int width, int height)
  48 {
  49         int i;
  50         struct drm_gem_object *obj;
  51         struct ast_bo *bo;
  52         int src_offset, dst_offset;
  53         int bpp = (afbdev->afb.base.bits_per_pixel + 7)/8;
  54         int ret = -EBUSY;
  55         bool unmap = false;
  56         bool store_for_later = false;
  57         int x2, y2;
  58         unsigned long flags;
  59
  60         obj = afbdev->afb.obj;
  61         bo = gem_to_ast_bo(obj);
  62
  63         /*
  64          * try and reserve the BO, if we fail with busy
  65          * then the BO is being moved and we should
  66          * store up the damage until later.
  67          */
  68         if (drm_can_sleep())
  69                 ret = ast_bo_reserve(bo, true);
  70         if (ret) {
  71                 if (ret != -EBUSY)
  72                         return;
  73
  74                 store_for_later = true;
  75         }
  76
  77         x2 = x + width - 1;
  78         y2 = y + height - 1;
  79         spin_lock_irqsave(&afbdev->dirty_lock, flags);
  80
  81         if (afbdev->y1 < y)
  82                 y = afbdev->y1;
  83         if (afbdev->y2 > y2)
  84                 y2 = afbdev->y2;
  85         if (afbdev->x1 < x)
  86                 x = afbdev->x1;
  87         if (afbdev->x2 > x2)
  88                 x2 = afbdev->x2;
  89
  90         if (store_for_later) {
  91                 afbdev->x1 = x;
  92                 afbdev->x2 = x2;
  93                 afbdev->y1 = y;
  94                 afbdev->y2 = y2;
  95                 spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
  96                 return;
  97         }
  98
  99         afbdev->x1 = afbdev->y1 = INT_MAX;
 100         afbdev->x2 = afbdev->y2 = 0;
 101         spin_unlock_irqrestore(&afbdev->dirty_lock, flags);
 102
 103         if (!bo->kmap.virtual) {
 104                 ret = ttm_bo_kmap(&bo->bo, 0, bo->bo.num_pages, &bo->kmap);
 105                 if (ret) {
 106                         DRM_ERROR("failed to kmap fb updates\n");
 107                         ast_bo_unreserve(bo);
 108                         return;
 109                 }
 110                 unmap = true;
 111         }
 112         for (i = y; i <= y2; i++) {
 113                 /* assume equal stride for now */
 114                 src_offset = dst_offset = i * afbdev->afb.base.pitches[0] + (x * bpp);
 115                 memcpy_toio(bo->kmap.virtual + src_offset, afbdev->sysram + src_offset, (x2 - x + 1) * bpp);
 116
 117         }
 118         if (unmap)
 119                 ttm_bo_kunmap(&bo->kmap);
 120
 121         ast_bo_unreserve(bo);
 122 }
 123
 124 static void ast_fillrect(struct fb_info *info,
 125                          const struct fb_fillrect *rect)
 126 {
 127         struct ast_fbdev *afbdev = info->par;
 128         drm_fb_helper_sys_fillrect(info, rect);
 129         ast_dirty_update(afbdev, rect->dx, rect->dy, rect->width,
 130                          rect->height);
 131 }
 132
 133 static void ast_copyarea(struct fb_info *info,
 134                          const struct fb_copyarea *area)
 135 {
 136         struct ast_fbdev *afbdev = info->par;
 137         drm_fb_helper_sys_copyarea(info, area);
 138         ast_dirty_update(afbdev, area->dx, area->dy, area->width,
 139                          area->height);
 140 }
 141
 142 static void ast_imageblit(struct fb_info *info,
 143                           const struct fb_image *image)
 144 {
 145         struct ast_fbdev *afbdev = info->par;
 146         drm_fb_helper_sys_imageblit(info, image);
 147         ast_dirty_update(afbdev, image->dx, image->dy, image->width,
 148                          image->height);
 149 }
 150
 151 static struct fb_ops astfb_ops = {
 152         .owner = THIS_MODULE,
 153         .fb_check_var = drm_fb_helper_check_var,
 154         .fb_set_par = drm_fb_helper_set_par,
 155         .fb_fillrect = ast_fillrect,
 156         .fb_copyarea = ast_copyarea,
 157         .fb_imageblit = ast_imageblit,
 158         .fb_pan_display = drm_fb_helper_pan_display,
 159         .fb_blank = drm_fb_helper_blank,
 160         .fb_setcmap = drm_fb_helper_setcmap,
 161         .fb_debug_enter = drm_fb_helper_debug_enter,
 162         .fb_debug_leave = drm_fb_helper_debug_leave,
 163 };
 164
 165 static int astfb_create_object(struct ast_fbdev *afbdev,
 166                                const struct drm_mode_fb_cmd2 *mode_cmd,
 167                                struct drm_gem_object **gobj_p)
 168 {
 169         struct drm_device *dev = afbdev->helper.dev;
 170         u32 size;
 171         struct drm_gem_object *gobj;
 172         int ret = 0;
 173
 174         size = mode_cmd->pitches[0] * mode_cmd->height;
 175         ret = ast_gem_create(dev, size, true, &gobj);
 176         if (ret)
 177                 return ret;
 178
 179         *gobj_p = gobj;
 180         return ret;
 181 }
 182
 183 static int astfb_create(struct drm_fb_helper *helper,
 184                         struct drm_fb_helper_surface_size *sizes)
 185 {
 186         struct ast_fbdev *afbdev =
 187                 container_of(helper, struct ast_fbdev, helper);
 188         struct drm_device *dev = afbdev->helper.dev;
 189         struct drm_mode_fb_cmd2 mode_cmd;
 190         struct drm_framebuffer *fb;
 191         struct fb_info *info;
 192         int size, ret;
 193         void *sysram;
 194         struct drm_gem_object *gobj = NULL;
 195         struct ast_bo *bo = NULL;
 196         mode_cmd.width = sizes->surface_width;
 197         mode_cmd.height = sizes->surface_height;
 198         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7)/8);
 199
 200         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
 201                                                           sizes->surface_depth);
 202
 203         size = mode_cmd.pitches[0] * mode_cmd.height;
 204
 205         ret = astfb_create_object(afbdev, &mode_cmd, &gobj);
 206         if (ret) {
 207                 DRM_ERROR("failed to create fbcon backing object %d\n", ret);
 208                 return ret;
 209         }
 210         bo = gem_to_ast_bo(gobj);
 211
 212         sysram = vmalloc(size);
 213         if (!sysram)
 214                 return -ENOMEM;
 215
 216         info = drm_fb_helper_alloc_fbi(helper);
 217         if (IS_ERR(info)) {
 218                 ret = PTR_ERR(info);
 219                 goto err_free_vram;
 220         }
 221         info->par = afbdev;
 222
 223         ret = ast_framebuffer_init(dev, &afbdev->afb, &mode_cmd, gobj);
 224         if (ret)
 225                 goto err_release_fbi;
 226
 227         afbdev->sysram = sysram;
 228         afbdev->size = size;
 229
 230         fb = &afbdev->afb.base;
 231         afbdev->helper.fb = fb;
 232
 233         strcpy(info->fix.id, "astdrmfb");
 234
 235         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
 236         info->fbops = &astfb_ops;
 237
 238         info->apertures->ranges[0].base = pci_resource_start(dev->pdev, 0);
 239         info->apertures->ranges[0].size = pci_resource_len(dev->pdev, 0);
 240
 241         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
 242         drm_fb_helper_fill_var(info, &afbdev->helper, sizes->fb_width, sizes->fb_height);
 243
 244         info->screen_base = sysram;
 245         info->screen_size = size;
 246
 247         info->pixmap.flags = FB_PIXMAP_SYSTEM;
 248
 249         DRM_DEBUG_KMS("allocated %dx%d\n",
 250                       fb->width, fb->height);
 251
 252         return 0;
 253
 254 err_release_fbi:
 255         drm_fb_helper_release_fbi(helper);
 256 err_free_vram:
 257         vfree(afbdev->sysram);
 258         return ret;
 259 }
 260
 261 static void ast_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
 262                                u16 blue, int regno)
 263 {
 264         struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
 265         ast_crtc->lut_r[regno] = red >> 8;
 266         ast_crtc->lut_g[regno] = green >> 8;
 267         ast_crtc->lut_b[regno] = blue >> 8;
 268 }
 269
 270 static void ast_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
 271                                u16 *blue, int regno)
 272 {
 273         struct ast_crtc *ast_crtc = to_ast_crtc(crtc);
 274         *red = ast_crtc->lut_r[regno] << 8;
 275         *green = ast_crtc->lut_g[regno] << 8;
 276         *blue = ast_crtc->lut_b[regno] << 8;
 277 }
 278
 279 static const struct drm_fb_helper_funcs ast_fb_helper_funcs = {
 280         .gamma_set = ast_fb_gamma_set,
 281         .gamma_get = ast_fb_gamma_get,
 282         .fb_probe = astfb_create,
 283 };
 284
 285 static void ast_fbdev_destroy(struct drm_device *dev,
 286                               struct ast_fbdev *afbdev)
 287 {
 288         struct ast_framebuffer *afb = &afbdev->afb;
 289
 290         drm_fb_helper_unregister_fbi(&afbdev->helper);
 291         drm_fb_helper_release_fbi(&afbdev->helper);
 292
 293         if (afb->obj) {
 294                 drm_gem_object_unreference_unlocked(afb->obj);
 295                 afb->obj = NULL;
 296         }
 297         drm_fb_helper_fini(&afbdev->helper);
 298
 299         vfree(afbdev->sysram);
 300         drm_framebuffer_unregister_private(&afb->base);
 301         drm_framebuffer_cleanup(&afb->base);
 302 }
 303
 304 int ast_fbdev_init(struct drm_device *dev)
 305 {
 306         struct ast_private *ast = dev->dev_private;
 307         struct ast_fbdev *afbdev;
 308         int ret;
 309
 310         afbdev = kzalloc(sizeof(struct ast_fbdev), GFP_KERNEL);
 311         if (!afbdev)
 312                 return -ENOMEM;
 313
 314         ast->fbdev = afbdev;
 315         spin_lock_init(&afbdev->dirty_lock);
 316
 317         drm_fb_helper_prepare(dev, &afbdev->helper, &ast_fb_helper_funcs);
 318
 319         ret = drm_fb_helper_init(dev, &afbdev->helper,
 320                                  1, 1);
 321         if (ret)
 322                 goto free;
 323
 324         ret = drm_fb_helper_single_add_all_connectors(&afbdev->helper);
 325         if (ret)
 326                 goto fini;
 327
 328         /* disable all the possible outputs/crtcs before entering KMS mode */
 329         drm_helper_disable_unused_functions(dev);
 330
 331         ret = drm_fb_helper_initial_config(&afbdev->helper, 32);
 332         if (ret)
 333                 goto fini;
 334
 335         return 0;
 336
 337 fini:
 338         drm_fb_helper_fini(&afbdev->helper);
 339 free:
 340         kfree(afbdev);
 341         return ret;
 342 }
 343
 344 void ast_fbdev_fini(struct drm_device *dev)
 345 {
 346         struct ast_private *ast = dev->dev_private;
 347
 348         if (!ast->fbdev)
 349                 return;
 350
 351         ast_fbdev_destroy(dev, ast->fbdev);
 352         kfree(ast->fbdev);
 353         ast->fbdev = NULL;
 354 }
 355
 356 void ast_fbdev_set_suspend(struct drm_device *dev, int state)
 357 {
 358         struct ast_private *ast = dev->dev_private;
 359
 360         if (!ast->fbdev)
 361                 return;
 362
 363         drm_fb_helper_set_suspend(&ast->fbdev->helper, state);
 364 }
 365
 366 void ast_fbdev_set_base(struct ast_private *ast, unsigned long gpu_addr)
 367 {
 368         ast->fbdev->helper.fbdev->fix.smem_start =
 369                 ast->fbdev->helper.fbdev->apertures->ranges[0].base + gpu_addr;
 370         ast->fbdev->helper.fbdev->fix.smem_len = ast->vram_size - gpu_addr;
 371 }