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
26static u32
27gf100_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
44static const struct nvkm_fuse_func
45gf100_fuse = {
46	.read = gf100_fuse_read,
47};
48
49int
50gf100_fuse_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
51	       struct nvkm_fuse **pfuse)
52{
53	return nvkm_fuse_new_(&gf100_fuse, device, type, inst, pfuse);
54}