drivers/gpu/drm/cirrus/cirrus_main.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 "drmP.h"
  12 #include "drm.h"
  13 #include "drm_crtc_helper.h"
  14
  15 #include "cirrus_drv.h"
  16
  17
  18 static void cirrus_user_framebuffer_destroy(struct drm_framebuffer *fb)
  19 {
  20         struct cirrus_framebuffer *cirrus_fb = to_cirrus_framebuffer(fb);
  21         if (cirrus_fb->obj)
  22                 drm_gem_object_unreference_unlocked(cirrus_fb->obj);
  23         drm_framebuffer_cleanup(fb);
  24         kfree(fb);
  25 }
  26
  27 static int cirrus_user_framebuffer_create_handle(struct drm_framebuffer *fb,
  28                                                  struct drm_file *file_priv,
  29                                                  unsigned int *handle)
  30 {
  31         return 0;
  32 }
  33
  34 static const struct drm_framebuffer_funcs cirrus_fb_funcs = {
  35         .destroy = cirrus_user_framebuffer_destroy,
  36         .create_handle = cirrus_user_framebuffer_create_handle,
  37 };
  38
  39 int cirrus_framebuffer_init(struct drm_device *dev,
  40                             struct cirrus_framebuffer *gfb,
  41                             struct drm_mode_fb_cmd2 *mode_cmd,
  42                             struct drm_gem_object *obj)
  43 {
  44         int ret;
  45
  46         ret = drm_framebuffer_init(dev, &gfb->base, &cirrus_fb_funcs);
  47         if (ret) {
  48                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
  49                 return ret;
  50         }
  51         drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
  52         gfb->obj = obj;
  53         return 0;
  54 }
  55
  56 static struct drm_framebuffer *
  57 cirrus_user_framebuffer_create(struct drm_device *dev,
  58                                struct drm_file *filp,
  59                                struct drm_mode_fb_cmd2 *mode_cmd)
  60 {
  61         struct drm_gem_object *obj;
  62         struct cirrus_framebuffer *cirrus_fb;
  63         int ret;
  64         u32 bpp, depth;
  65
  66         drm_fb_get_bpp_depth(mode_cmd->pixel_format, &depth, &bpp);
  67         /* cirrus can't handle > 24bpp framebuffers at all */
  68         if (bpp > 24)
  69                 return ERR_PTR(-EINVAL);
  70
  71         obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
  72         if (obj == NULL)
  73                 return ERR_PTR(-ENOENT);
  74
  75         cirrus_fb = kzalloc(sizeof(*cirrus_fb), GFP_KERNEL);
  76         if (!cirrus_fb) {
  77                 drm_gem_object_unreference_unlocked(obj);
  78                 return ERR_PTR(-ENOMEM);
  79         }
  80
  81         ret = cirrus_framebuffer_init(dev, cirrus_fb, mode_cmd, obj);
  82         if (ret) {
  83                 drm_gem_object_unreference_unlocked(obj);
  84                 kfree(cirrus_fb);
  85                 return ERR_PTR(ret);
  86         }
  87         return &cirrus_fb->base;
  88 }
  89
  90 static const struct drm_mode_config_funcs cirrus_mode_funcs = {
  91         .fb_create = cirrus_user_framebuffer_create,
  92 };
  93
  94 /* Unmap the framebuffer from the core and release the memory */
  95 static void cirrus_vram_fini(struct cirrus_device *cdev)
  96 {
  97         iounmap(cdev->rmmio);
  98         cdev->rmmio = NULL;
  99         if (cdev->mc.vram_base)
 100                 release_mem_region(cdev->mc.vram_base, cdev->mc.vram_size);
 101 }
 102
 103 /* Map the framebuffer from the card and configure the core */
 104 static int cirrus_vram_init(struct cirrus_device *cdev)
 105 {
 106         /* BAR 0 is VRAM */
 107         cdev->mc.vram_base = pci_resource_start(cdev->dev->pdev, 0);
 108         /* We have 4MB of VRAM */
 109         cdev->mc.vram_size = 4 * 1024 * 1024;
 110
 111         if (!request_mem_region(cdev->mc.vram_base, cdev->mc.vram_size,
 112                                 "cirrusdrmfb_vram")) {
 113                 DRM_ERROR("can't reserve VRAM\n");
 114                 return -ENXIO;
 115         }
 116
 117         return 0;
 118 }
 119
 120 /*
 121  * Our emulated hardware has two sets of memory. One is video RAM and can
 122  * simply be used as a linear framebuffer - the other provides mmio access
 123  * to the display registers. The latter can also be accessed via IO port
 124  * access, but we map the range and use mmio to program them instead
 125  */
 126
 127 int cirrus_device_init(struct cirrus_device *cdev,
 128                        struct drm_device *ddev,
 129                        struct pci_dev *pdev, uint32_t flags)
 130 {
 131         int ret;
 132
 133         cdev->dev = ddev;
 134         cdev->flags = flags;
 135
 136         /* Hardcode the number of CRTCs to 1 */
 137         cdev->num_crtc = 1;
 138
 139         /* BAR 0 is the framebuffer, BAR 1 contains registers */
 140         cdev->rmmio_base = pci_resource_start(cdev->dev->pdev, 1);
 141         cdev->rmmio_size = pci_resource_len(cdev->dev->pdev, 1);
 142
 143         if (!request_mem_region(cdev->rmmio_base, cdev->rmmio_size,
 144                                 "cirrusdrmfb_mmio")) {
 145                 DRM_ERROR("can't reserve mmio registers\n");
 146                 return -ENOMEM;
 147         }
 148
 149         cdev->rmmio = ioremap(cdev->rmmio_base, cdev->rmmio_size);
 150
 151         if (cdev->rmmio == NULL)
 152                 return -ENOMEM;
 153
 154         ret = cirrus_vram_init(cdev);
 155         if (ret) {
 156                 release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
 157                 return ret;
 158         }
 159
 160         return 0;
 161 }
 162
 163 void cirrus_device_fini(struct cirrus_device *cdev)
 164 {
 165         release_mem_region(cdev->rmmio_base, cdev->rmmio_size);
 166         cirrus_vram_fini(cdev);
 167 }
 168
 169 /*
 170  * Functions here will be called by the core once it's bound the driver to
 171  * a PCI device
 172  */
 173
 174 int cirrus_driver_load(struct drm_device *dev, unsigned long flags)
 175 {
 176         struct cirrus_device *cdev;
 177         int r;
 178
 179         cdev = kzalloc(sizeof(struct cirrus_device), GFP_KERNEL);
 180         if (cdev == NULL)
 181                 return -ENOMEM;
 182         dev->dev_private = (void *)cdev;
 183
 184         r = cirrus_device_init(cdev, dev, dev->pdev, flags);
 185         if (r) {
 186                 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
 187                 goto out;
 188         }
 189
 190         r = cirrus_mm_init(cdev);
 191         if (r)
 192                 dev_err(&dev->pdev->dev, "fatal err on mm init\n");
 193
 194         r = cirrus_modeset_init(cdev);
 195         if (r)
 196                 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
 197
 198         dev->mode_config.funcs = (void *)&cirrus_mode_funcs;
 199 out:
 200         if (r)
 201                 cirrus_driver_unload(dev);
 202         return r;
 203 }
 204
 205 int cirrus_driver_unload(struct drm_device *dev)
 206 {
 207         struct cirrus_device *cdev = dev->dev_private;
 208
 209         if (cdev == NULL)
 210                 return 0;
 211         cirrus_modeset_fini(cdev);
 212         cirrus_mm_fini(cdev);
 213         cirrus_device_fini(cdev);
 214         kfree(cdev);
 215         dev->dev_private = NULL;
 216         return 0;
 217 }
 218
 219 int cirrus_gem_create(struct drm_device *dev,
 220                    u32 size, bool iskernel,
 221                    struct drm_gem_object **obj)
 222 {
 223         struct cirrus_bo *cirrusbo;
 224         int ret;
 225
 226         *obj = NULL;
 227
 228         size = roundup(size, PAGE_SIZE);
 229         if (size == 0)
 230                 return -EINVAL;
 231
 232         ret = cirrus_bo_create(dev, size, 0, 0, &cirrusbo);
 233         if (ret) {
 234                 if (ret != -ERESTARTSYS)
 235                         DRM_ERROR("failed to allocate GEM object\n");
 236                 return ret;
 237         }
 238         *obj = &cirrusbo->gem;
 239         return 0;
 240 }
 241
 242 int cirrus_dumb_create(struct drm_file *file,
 243                     struct drm_device *dev,
 244                     struct drm_mode_create_dumb *args)
 245 {
 246         int ret;
 247         struct drm_gem_object *gobj;
 248         u32 handle;
 249
 250         args->pitch = args->width * ((args->bpp + 7) / 8);
 251         args->size = args->pitch * args->height;
 252
 253         ret = cirrus_gem_create(dev, args->size, false,
 254                              &gobj);
 255         if (ret)
 256                 return ret;
 257
 258         ret = drm_gem_handle_create(file, gobj, &handle);
 259         drm_gem_object_unreference_unlocked(gobj);
 260         if (ret)
 261                 return ret;
 262
 263         args->handle = handle;
 264         return 0;
 265 }
 266
 267 int cirrus_dumb_destroy(struct drm_file *file,
 268                      struct drm_device *dev,
 269                      uint32_t handle)
 270 {
 271         return drm_gem_handle_delete(file, handle);
 272 }
 273
 274 int cirrus_gem_init_object(struct drm_gem_object *obj)
 275 {
 276         BUG();
 277         return 0;
 278 }
 279
 280 void cirrus_bo_unref(struct cirrus_bo **bo)
 281 {
 282         struct ttm_buffer_object *tbo;
 283
 284         if ((*bo) == NULL)
 285                 return;
 286
 287         tbo = &((*bo)->bo);
 288         ttm_bo_unref(&tbo);
 289         if (tbo == NULL)
 290                 *bo = NULL;
 291
 292 }
 293
 294 void cirrus_gem_free_object(struct drm_gem_object *obj)
 295 {
 296         struct cirrus_bo *cirrus_bo = gem_to_cirrus_bo(obj);
 297
 298         if (!cirrus_bo)
 299                 return;
 300         cirrus_bo_unref(&cirrus_bo);
 301 }
 302
 303
 304 static inline u64 cirrus_bo_mmap_offset(struct cirrus_bo *bo)
 305 {
 306         return bo->bo.addr_space_offset;
 307 }
 308
 309 int
 310 cirrus_dumb_mmap_offset(struct drm_file *file,
 311                      struct drm_device *dev,
 312                      uint32_t handle,
 313                      uint64_t *offset)
 314 {
 315         struct drm_gem_object *obj;
 316         int ret;
 317         struct cirrus_bo *bo;
 318
 319         mutex_lock(&dev->struct_mutex);
 320         obj = drm_gem_object_lookup(dev, file, handle);
 321         if (obj == NULL) {
 322                 ret = -ENOENT;
 323                 goto out_unlock;
 324         }
 325
 326         bo = gem_to_cirrus_bo(obj);
 327         *offset = cirrus_bo_mmap_offset(bo);
 328
 329         drm_gem_object_unreference(obj);
 330         ret = 0;
 331 out_unlock:
 332         mutex_unlock(&dev->struct_mutex);
 333         return ret;
 334
 335 }