drivers/gpu/drm/mgag200/mgag200_main.c

   1 /*
   2  * Copyright 2010 Matt Turner.
   3  * Copyright 2012 Red Hat
   4  *
   5  * This file is subject to the terms and conditions of the GNU General
   6  * Public License version 2. See the file COPYING in the main
   7  * directory of this archive for more details.
   8  *
   9  * Authors: Matthew Garrett
  10  *          Matt Turner
  11  *          Dave Airlie
  12  */
  13 #include <drm/drmP.h>
  14 #include <drm/drm_crtc_helper.h>
  15 #include "mgag200_drv.h"
  16
  17 static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
  18 {
  19         struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
  20         if (mga_fb->obj)
  21                 drm_gem_object_unreference_unlocked(mga_fb->obj);
  22         drm_framebuffer_cleanup(fb);
  23         kfree(fb);
  24 }
  25
  26 static const struct drm_framebuffer_funcs mga_fb_funcs = {
  27         .destroy = mga_user_framebuffer_destroy,
  28 };
  29
  30 int mgag200_framebuffer_init(struct drm_device *dev,
  31                              struct mga_framebuffer *gfb,
  32                              struct drm_mode_fb_cmd2 *mode_cmd,
  33                              struct drm_gem_object *obj)
  34 {
  35         int ret;
  36
  37         drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
  38         gfb->obj = obj;
  39         ret = drm_framebuffer_init(dev, &gfb->base, &mga_fb_funcs);
  40         if (ret) {
  41                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
  42                 return ret;
  43         }
  44         return 0;
  45 }
  46
  47 static struct drm_framebuffer *
  48 mgag200_user_framebuffer_create(struct drm_device *dev,
  49                                 struct drm_file *filp,
  50                                 struct drm_mode_fb_cmd2 *mode_cmd)
  51 {
  52         struct drm_gem_object *obj;
  53         struct mga_framebuffer *mga_fb;
  54         int ret;
  55
  56         obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
  57         if (obj == NULL)
  58                 return ERR_PTR(-ENOENT);
  59
  60         mga_fb = kzalloc(sizeof(*mga_fb), GFP_KERNEL);
  61         if (!mga_fb) {
  62                 drm_gem_object_unreference_unlocked(obj);
  63                 return ERR_PTR(-ENOMEM);
  64         }
  65
  66         ret = mgag200_framebuffer_init(dev, mga_fb, mode_cmd, obj);
  67         if (ret) {
  68                 drm_gem_object_unreference_unlocked(obj);
  69                 kfree(mga_fb);
  70                 return ERR_PTR(ret);
  71         }
  72         return &mga_fb->base;
  73 }
  74
  75 static const struct drm_mode_config_funcs mga_mode_funcs = {
  76         .fb_create = mgag200_user_framebuffer_create,
  77 };
  78
  79 static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
  80 {
  81         int offset;
  82         int orig;
  83         int test1, test2;
  84         int orig1, orig2;
  85
  86         /* Probe */
  87         orig = ioread16(mem);
  88         iowrite16(0, mem);
  89
  90         for (offset = 0x100000; offset < mdev->mc.vram_window; offset += 0x4000) {
  91                 orig1 = ioread8(mem + offset);
  92                 orig2 = ioread8(mem + offset + 0x100);
  93
  94                 iowrite16(0xaa55, mem + offset);
  95                 iowrite16(0xaa55, mem + offset + 0x100);
  96
  97                 test1 = ioread16(mem + offset);
  98                 test2 = ioread16(mem);
  99
 100                 iowrite16(orig1, mem + offset);
 101                 iowrite16(orig2, mem + offset + 0x100);
 102
 103                 if (test1 != 0xaa55) {
 104                         break;
 105                 }
 106
 107                 if (test2) {
 108                         break;
 109                 }
 110         }
 111
 112         iowrite16(orig, mem);
 113         return offset - 65536;
 114 }
 115
 116 /* Map the framebuffer from the card and configure the core */
 117 static int mga_vram_init(struct mga_device *mdev)
 118 {
 119         void __iomem *mem;
 120         struct apertures_struct *aper = alloc_apertures(1);
 121         if (!aper)
 122                 return -ENOMEM;
 123
 124         /* BAR 0 is VRAM */
 125         mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
 126         mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
 127
 128         aper->ranges[0].base = mdev->mc.vram_base;
 129         aper->ranges[0].size = mdev->mc.vram_window;
 130
 131         remove_conflicting_framebuffers(aper, "mgafb", true);
 132         kfree(aper);
 133
 134         if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
 135                                 "mgadrmfb_vram")) {
 136                 DRM_ERROR("can't reserve VRAM\n");
 137                 return -ENXIO;
 138         }
 139
 140         mem = pci_iomap(mdev->dev->pdev, 0, 0);
 141
 142         mdev->mc.vram_size = mga_probe_vram(mdev, mem);
 143
 144         pci_iounmap(mdev->dev->pdev, mem);
 145
 146         return 0;
 147 }
 148
 149 static int mgag200_device_init(struct drm_device *dev,
 150                                uint32_t flags)
 151 {
 152         struct mga_device *mdev = dev->dev_private;
 153         int ret, option;
 154
 155         mdev->type = flags;
 156
 157         /* Hardcode the number of CRTCs to 1 */
 158         mdev->num_crtc = 1;
 159
 160         pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
 161         mdev->has_sdram = !(option & (1 << 14));
 162
 163         /* BAR 0 is the framebuffer, BAR 1 contains registers */
 164         mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
 165         mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
 166
 167         if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
 168                                 "mgadrmfb_mmio")) {
 169                 DRM_ERROR("can't reserve mmio registers\n");
 170                 return -ENOMEM;
 171         }
 172
 173         mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
 174         if (mdev->rmmio == NULL)
 175                 return -ENOMEM;
 176
 177         /* stash G200 SE model number for later use */
 178         if (IS_G200_SE(mdev))
 179                 mdev->unique_rev_id = RREG32(0x1e24);
 180
 181         ret = mga_vram_init(mdev);
 182         if (ret)
 183                 return ret;
 184
 185         mdev->bpp_shifts[0] = 0;
 186         mdev->bpp_shifts[1] = 1;
 187         mdev->bpp_shifts[2] = 0;
 188         mdev->bpp_shifts[3] = 2;
 189         return 0;
 190 }
 191
 192 /*
 193  * Functions here will be called by the core once it's bound the driver to
 194  * a PCI device
 195  */
 196
 197
 198 int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 199 {
 200         struct mga_device *mdev;
 201         int r;
 202
 203         mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
 204         if (mdev == NULL)
 205                 return -ENOMEM;
 206         dev->dev_private = (void *)mdev;
 207         mdev->dev = dev;
 208
 209         r = mgag200_device_init(dev, flags);
 210         if (r) {
 211                 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
 212                 return r;
 213         }
 214         r = mgag200_mm_init(mdev);
 215         if (r)
 216                 goto out;
 217
 218         drm_mode_config_init(dev);
 219         dev->mode_config.funcs = (void *)&mga_mode_funcs;
 220         if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 221                 dev->mode_config.preferred_depth = 16;
 222         else
 223                 dev->mode_config.preferred_depth = 24;
 224         dev->mode_config.prefer_shadow = 1;
 225
 226         r = mgag200_modeset_init(mdev);
 227         if (r) {
 228                 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
 229                 goto out;
 230         }
 231
 232         /* Make small buffers to store a hardware cursor (double buffered icon updates) */
 233         mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
 234                                           &mdev->cursor.pixels_1);
 235         mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
 236                                           &mdev->cursor.pixels_2);
 237         if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1)
 238                 goto cursor_nospace;
 239         mdev->cursor.pixels_current = mdev->cursor.pixels_1;
 240         mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
 241         goto cursor_done;
 242  cursor_nospace:
 243         mdev->cursor.pixels_1 = NULL;
 244         mdev->cursor.pixels_2 = NULL;
 245         dev_warn(&dev->pdev->dev, "Could not allocate space for cursors. Not doing hardware cursors.\n");
 246  cursor_done:
 247
 248 out:
 249         if (r)
 250                 mgag200_driver_unload(dev);
 251         return r;
 252 }
 253
 254 int mgag200_driver_unload(struct drm_device *dev)
 255 {
 256         struct mga_device *mdev = dev->dev_private;
 257
 258         if (mdev == NULL)
 259                 return 0;
 260         mgag200_modeset_fini(mdev);
 261         mgag200_fbdev_fini(mdev);
 262         drm_mode_config_cleanup(dev);
 263         mgag200_mm_fini(mdev);
 264         dev->dev_private = NULL;
 265         return 0;
 266 }
 267
 268 int mgag200_gem_create(struct drm_device *dev,
 269                    u32 size, bool iskernel,
 270                    struct drm_gem_object **obj)
 271 {
 272         struct mgag200_bo *astbo;
 273         int ret;
 274
 275         *obj = NULL;
 276
 277         size = roundup(size, PAGE_SIZE);
 278         if (size == 0)
 279                 return -EINVAL;
 280
 281         ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
 282         if (ret) {
 283                 if (ret != -ERESTARTSYS)
 284                         DRM_ERROR("failed to allocate GEM object\n");
 285                 return ret;
 286         }
 287         *obj = &astbo->gem;
 288         return 0;
 289 }
 290
 291 int mgag200_dumb_create(struct drm_file *file,
 292                     struct drm_device *dev,
 293                     struct drm_mode_create_dumb *args)
 294 {
 295         int ret;
 296         struct drm_gem_object *gobj;
 297         u32 handle;
 298
 299         args->pitch = args->width * ((args->bpp + 7) / 8);
 300         args->size = args->pitch * args->height;
 301
 302         ret = mgag200_gem_create(dev, args->size, false,
 303                              &gobj);
 304         if (ret)
 305                 return ret;
 306
 307         ret = drm_gem_handle_create(file, gobj, &handle);
 308         drm_gem_object_unreference_unlocked(gobj);
 309         if (ret)
 310                 return ret;
 311
 312         args->handle = handle;
 313         return 0;
 314 }
 315
 316 static void mgag200_bo_unref(struct mgag200_bo **bo)
 317 {
 318         struct ttm_buffer_object *tbo;
 319
 320         if ((*bo) == NULL)
 321                 return;
 322
 323         tbo = &((*bo)->bo);
 324         ttm_bo_unref(&tbo);
 325         *bo = NULL;
 326 }
 327
 328 void mgag200_gem_free_object(struct drm_gem_object *obj)
 329 {
 330         struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);
 331
 332         mgag200_bo_unref(&mgag200_bo);
 333 }
 334
 335
 336 static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
 337 {
 338         return drm_vma_node_offset_addr(&bo->bo.vma_node);
 339 }
 340
 341 int
 342 mgag200_dumb_mmap_offset(struct drm_file *file,
 343                      struct drm_device *dev,
 344                      uint32_t handle,
 345                      uint64_t *offset)
 346 {
 347         struct drm_gem_object *obj;
 348         int ret;
 349         struct mgag200_bo *bo;
 350
 351         mutex_lock(&dev->struct_mutex);
 352         obj = drm_gem_object_lookup(dev, file, handle);
 353         if (obj == NULL) {
 354                 ret = -ENOENT;
 355                 goto out_unlock;
 356         }
 357
 358         bo = gem_to_mga_bo(obj);
 359         *offset = mgag200_bo_mmap_offset(bo);
 360
 361         drm_gem_object_unreference(obj);
 362         ret = 0;
 363 out_unlock:
 364         mutex_unlock(&dev->struct_mutex);
 365         return ret;
 366
 367 }