drivers/gpu/drm/nouveau/nvkm/subdev/fuse/gf100.c

   1 /*
   2  * Copyright 2014 Martin Peres
   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: Martin Peres
  23  */
  24 #include "priv.h"
  25
  26 static u32
  27 gf100_fuse_read(struct nvkm_fuse *fuse, u32 addr)
  28 {
  29         struct nvkm_device *device = fuse->subdev.device;
  30         unsigned long flags;
  31         u32 fuse_enable, unk, val;
  32
  33         /* racy if another part of nvkm start writing to these regs */
  34         spin_lock_irqsave(&fuse->lock, flags);
  35         fuse_enable = nvkm_mask(device, 0x022400, 0x800, 0x800);
  36         unk = nvkm_mask(device, 0x021000, 0x1, 0x1);
  37         val = nvkm_rd32(device, 0x021100 + addr);
  38         nvkm_wr32(device, 0x021000, unk);
  39         nvkm_wr32(device, 0x022400, fuse_enable);
  40         spin_unlock_irqrestore(&fuse->lock, flags);
  41         return val;
  42 }
  43
  44 static const struct nvkm_fuse_func
  45 gf100_fuse = {
  46         .read = gf100_fuse_read,
  47 };
  48
  49 int
  50 gf100_fuse_new(struct nvkm_device *device, int index, struct nvkm_fuse **pfuse)
  51 {
  52         return nvkm_fuse_new_(&gf100_fuse, device, index, pfuse);
  53 }