subdev/fuse/gf100.c

0001 /*
0002  * Copyright 2014 Martin Peres
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: Martin Peres
0023  */
0024 #include "priv.h"
0025
0026 static u32
0027 gf100_fuse_read(struct nvkm_fuse *fuse, u32 addr)
0028 {
0029     struct nvkm_device *device = fuse->subdev.device;
0030     unsigned long flags;
0031     u32 fuse_enable, unk, val;
0032
0033     /* racy if another part of nvkm start writing to these regs */
0034     spin_lock_irqsave(&fuse->lock, flags);
0035     fuse_enable = nvkm_mask(device, 0x022400, 0x800, 0x800);
0036     unk = nvkm_mask(device, 0x021000, 0x1, 0x1);
0037     val = nvkm_rd32(device, 0x021100 + addr);
0038     nvkm_wr32(device, 0x021000, unk);
0039     nvkm_wr32(device, 0x022400, fuse_enable);
0040     spin_unlock_irqrestore(&fuse->lock, flags);
0041     return val;
0042 }
0043
0044 static const struct nvkm_fuse_func
0045 gf100_fuse = {
0046     .read = gf100_fuse_read,
0047 };
0048
0049 int
0050 gf100_fuse_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
0051            struct nvkm_fuse **pfuse)
0052 {
0053     return nvkm_fuse_new_(&gf100_fuse, device, type, inst, pfuse);
0054 }