linux/drivers/gpu/drm/mgag200/mgag200_main.c
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   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
  17static void mga_user_framebuffer_destroy(struct drm_framebuffer *fb)
  18{
  19        struct mga_framebuffer *mga_fb = to_mga_framebuffer(fb);
  20
  21        drm_gem_object_unreference_unlocked(mga_fb->obj);
  22        drm_framebuffer_cleanup(fb);
  23        kfree(fb);
  24}
  25
  26static const struct drm_framebuffer_funcs mga_fb_funcs = {
  27        .destroy = mga_user_framebuffer_destroy,
  28};
  29
  30int mgag200_framebuffer_init(struct drm_device *dev,
  31                             struct mga_framebuffer *gfb,
  32                             const 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
  47static struct drm_framebuffer *
  48mgag200_user_framebuffer_create(struct drm_device *dev,
  49                                struct drm_file *filp,
  50                                const 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(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
  75static const struct drm_mode_config_funcs mga_mode_funcs = {
  76        .fb_create = mgag200_user_framebuffer_create,
  77};
  78
  79static 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        unsigned int vram_size;
  86
  87        /* Probe */
  88        orig = ioread16(mem);
  89        iowrite16(0, mem);
  90
  91        vram_size = mdev->mc.vram_window;
  92
  93        if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
  94                vram_size = vram_size - 0x400000;
  95        }
  96
  97        for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
  98                orig1 = ioread8(mem + offset);
  99                orig2 = ioread8(mem + offset + 0x100);
 100
 101                iowrite16(0xaa55, mem + offset);
 102                iowrite16(0xaa55, mem + offset + 0x100);
 103
 104                test1 = ioread16(mem + offset);
 105                test2 = ioread16(mem);
 106
 107                iowrite16(orig1, mem + offset);
 108                iowrite16(orig2, mem + offset + 0x100);
 109
 110                if (test1 != 0xaa55) {
 111                        break;
 112                }
 113
 114                if (test2) {
 115                        break;
 116                }
 117        }
 118
 119        iowrite16(orig, mem);
 120        return offset - 65536;
 121}
 122
 123/* Map the framebuffer from the card and configure the core */
 124static int mga_vram_init(struct mga_device *mdev)
 125{
 126        void __iomem *mem;
 127        struct apertures_struct *aper = alloc_apertures(1);
 128        if (!aper)
 129                return -ENOMEM;
 130
 131        /* BAR 0 is VRAM */
 132        mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
 133        mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
 134
 135        aper->ranges[0].base = mdev->mc.vram_base;
 136        aper->ranges[0].size = mdev->mc.vram_window;
 137
 138        drm_fb_helper_remove_conflicting_framebuffers(aper, "mgafb", true);
 139        kfree(aper);
 140
 141        if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
 142                                "mgadrmfb_vram")) {
 143                DRM_ERROR("can't reserve VRAM\n");
 144                return -ENXIO;
 145        }
 146
 147        mem = pci_iomap(mdev->dev->pdev, 0, 0);
 148
 149        mdev->mc.vram_size = mga_probe_vram(mdev, mem);
 150
 151        pci_iounmap(mdev->dev->pdev, mem);
 152
 153        return 0;
 154}
 155
 156static int mgag200_device_init(struct drm_device *dev,
 157                               uint32_t flags)
 158{
 159        struct mga_device *mdev = dev->dev_private;
 160        int ret, option;
 161
 162        mdev->type = flags;
 163
 164        /* Hardcode the number of CRTCs to 1 */
 165        mdev->num_crtc = 1;
 166
 167        pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
 168        mdev->has_sdram = !(option & (1 << 14));
 169
 170        /* BAR 0 is the framebuffer, BAR 1 contains registers */
 171        mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
 172        mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
 173
 174        if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
 175                                "mgadrmfb_mmio")) {
 176                DRM_ERROR("can't reserve mmio registers\n");
 177                return -ENOMEM;
 178        }
 179
 180        mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
 181        if (mdev->rmmio == NULL)
 182                return -ENOMEM;
 183
 184        /* stash G200 SE model number for later use */
 185        if (IS_G200_SE(mdev))
 186                mdev->unique_rev_id = RREG32(0x1e24);
 187
 188        ret = mga_vram_init(mdev);
 189        if (ret)
 190                return ret;
 191
 192        mdev->bpp_shifts[0] = 0;
 193        mdev->bpp_shifts[1] = 1;
 194        mdev->bpp_shifts[2] = 0;
 195        mdev->bpp_shifts[3] = 2;
 196        return 0;
 197}
 198
 199/*
 200 * Functions here will be called by the core once it's bound the driver to
 201 * a PCI device
 202 */
 203
 204
 205int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 206{
 207        struct mga_device *mdev;
 208        int r;
 209
 210        mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
 211        if (mdev == NULL)
 212                return -ENOMEM;
 213        dev->dev_private = (void *)mdev;
 214        mdev->dev = dev;
 215
 216        r = mgag200_device_init(dev, flags);
 217        if (r) {
 218                dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
 219                return r;
 220        }
 221        r = mgag200_mm_init(mdev);
 222        if (r)
 223                goto err_mm;
 224
 225        drm_mode_config_init(dev);
 226        dev->mode_config.funcs = (void *)&mga_mode_funcs;
 227        if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
 228                dev->mode_config.preferred_depth = 16;
 229        else
 230                dev->mode_config.preferred_depth = 24;
 231        dev->mode_config.prefer_shadow = 1;
 232
 233        r = mgag200_modeset_init(mdev);
 234        if (r) {
 235                dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
 236                goto err_modeset;
 237        }
 238
 239        /* Make small buffers to store a hardware cursor (double buffered icon updates) */
 240        mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
 241                                          &mdev->cursor.pixels_1);
 242        mgag200_bo_create(dev, roundup(48*64, PAGE_SIZE), 0, 0,
 243                                          &mdev->cursor.pixels_2);
 244        if (!mdev->cursor.pixels_2 || !mdev->cursor.pixels_1) {
 245                mdev->cursor.pixels_1 = NULL;
 246                mdev->cursor.pixels_2 = NULL;
 247                dev_warn(&dev->pdev->dev,
 248                        "Could not allocate space for cursors. Not doing hardware cursors.\n");
 249        } else {
 250                mdev->cursor.pixels_current = mdev->cursor.pixels_1;
 251                mdev->cursor.pixels_prev = mdev->cursor.pixels_2;
 252        }
 253
 254        return 0;
 255
 256err_modeset:
 257        drm_mode_config_cleanup(dev);
 258        mgag200_mm_fini(mdev);
 259err_mm:
 260        dev->dev_private = NULL;
 261
 262        return r;
 263}
 264
 265int mgag200_driver_unload(struct drm_device *dev)
 266{
 267        struct mga_device *mdev = dev->dev_private;
 268
 269        if (mdev == NULL)
 270                return 0;
 271        mgag200_modeset_fini(mdev);
 272        mgag200_fbdev_fini(mdev);
 273        drm_mode_config_cleanup(dev);
 274        mgag200_mm_fini(mdev);
 275        dev->dev_private = NULL;
 276        return 0;
 277}
 278
 279int mgag200_gem_create(struct drm_device *dev,
 280                   u32 size, bool iskernel,
 281                   struct drm_gem_object **obj)
 282{
 283        struct mgag200_bo *astbo;
 284        int ret;
 285
 286        *obj = NULL;
 287
 288        size = roundup(size, PAGE_SIZE);
 289        if (size == 0)
 290                return -EINVAL;
 291
 292        ret = mgag200_bo_create(dev, size, 0, 0, &astbo);
 293        if (ret) {
 294                if (ret != -ERESTARTSYS)
 295                        DRM_ERROR("failed to allocate GEM object\n");
 296                return ret;
 297        }
 298        *obj = &astbo->gem;
 299        return 0;
 300}
 301
 302int mgag200_dumb_create(struct drm_file *file,
 303                    struct drm_device *dev,
 304                    struct drm_mode_create_dumb *args)
 305{
 306        int ret;
 307        struct drm_gem_object *gobj;
 308        u32 handle;
 309
 310        args->pitch = args->width * ((args->bpp + 7) / 8);
 311        args->size = args->pitch * args->height;
 312
 313        ret = mgag200_gem_create(dev, args->size, false,
 314                             &gobj);
 315        if (ret)
 316                return ret;
 317
 318        ret = drm_gem_handle_create(file, gobj, &handle);
 319        drm_gem_object_unreference_unlocked(gobj);
 320        if (ret)
 321                return ret;
 322
 323        args->handle = handle;
 324        return 0;
 325}
 326
 327static void mgag200_bo_unref(struct mgag200_bo **bo)
 328{
 329        struct ttm_buffer_object *tbo;
 330
 331        if ((*bo) == NULL)
 332                return;
 333
 334        tbo = &((*bo)->bo);
 335        ttm_bo_unref(&tbo);
 336        *bo = NULL;
 337}
 338
 339void mgag200_gem_free_object(struct drm_gem_object *obj)
 340{
 341        struct mgag200_bo *mgag200_bo = gem_to_mga_bo(obj);
 342
 343        mgag200_bo_unref(&mgag200_bo);
 344}
 345
 346
 347static inline u64 mgag200_bo_mmap_offset(struct mgag200_bo *bo)
 348{
 349        return drm_vma_node_offset_addr(&bo->bo.vma_node);
 350}
 351
 352int
 353mgag200_dumb_mmap_offset(struct drm_file *file,
 354                     struct drm_device *dev,
 355                     uint32_t handle,
 356                     uint64_t *offset)
 357{
 358        struct drm_gem_object *obj;
 359        struct mgag200_bo *bo;
 360
 361        obj = drm_gem_object_lookup(file, handle);
 362        if (obj == NULL)
 363                return -ENOENT;
 364
 365        bo = gem_to_mga_bo(obj);
 366        *offset = mgag200_bo_mmap_offset(bo);
 367
 368        drm_gem_object_unreference_unlocked(obj);
 369        return 0;
 370}
 371