LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/fb/ramnv04.c

   1/*
   2 * Copyright 2013 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 "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: Ben Skeggs
  23 */
  24#include "ram.h"
  25#include "regsnv04.h"
  26
  27const struct nvkm_ram_func
  28nv04_ram_func = {
  29};
  30
  31int
  32nv04_ram_new(struct nvkm_fb *fb, struct nvkm_ram **pram)
  33{
  34        struct nvkm_device *device = fb->subdev.device;
  35        u32 boot0 = nvkm_rd32(device, NV04_PFB_BOOT_0);
  36        u64 size;
  37        enum nvkm_ram_type type;
  38
  39        if (boot0 & 0x00000100) {
  40                size  = ((boot0 >> 12) & 0xf) * 2 + 2;
  41                size *= 1024 * 1024;
  42        } else {
  43                switch (boot0 & NV04_PFB_BOOT_0_RAM_AMOUNT) {
  44                case NV04_PFB_BOOT_0_RAM_AMOUNT_32MB:
  45                        size = 32 * 1024 * 1024;
  46                        break;
  47                case NV04_PFB_BOOT_0_RAM_AMOUNT_16MB:
  48                        size = 16 * 1024 * 1024;
  49                        break;
  50                case NV04_PFB_BOOT_0_RAM_AMOUNT_8MB:
  51                        size = 8 * 1024 * 1024;
  52                        break;
  53                case NV04_PFB_BOOT_0_RAM_AMOUNT_4MB:
  54                        size = 4 * 1024 * 1024;
  55                        break;
  56                }
  57        }
  58
  59        if ((boot0 & 0x00000038) <= 0x10)
  60                type = NVKM_RAM_TYPE_SGRAM;
  61        else
  62                type = NVKM_RAM_TYPE_SDRAM;
  63
  64        return nvkm_ram_new_(&nv04_ram_func, fb, type, size, pram);
  65}
  66