1/*
2 * Copyright 2012 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 */
23#include "priv.h"
24
25struct priv {
26	struct nvkm_bios *bios;
27	u32 bar0;
28};
29
30static u32
31pramin_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
32{
33	struct nvkm_device *device = bios->subdev.device;
34	u32 i;
35	if (offset + length <= 0x00100000) {
36		for (i = offset; i < offset + length; i += 4)
37			*(u32 *)&bios->data[i] = nvkm_rd32(device, 0x700000 + i);
38		return length;
39	}
40	return 0;
41}
42
43static void
44pramin_fini(void *data)
45{
46	struct priv *priv = data;
47	if (priv) {
48		struct nvkm_device *device = priv->bios->subdev.device;
49		nvkm_wr32(device, 0x001700, priv->bar0);
50		kfree(priv);
51	}
52}
53
54static void *
55pramin_init(struct nvkm_bios *bios, const char *name)
56{
57	struct nvkm_subdev *subdev = &bios->subdev;
58	struct nvkm_device *device = subdev->device;
59	struct priv *priv = NULL;
60	u64 addr = 0;
61
62	/* PRAMIN always potentially available prior to nv50 */
63	if (device->card_type < NV_50)
64		return NULL;
65
66	/* we can't get the bios image pointer without PDISP */
67	if (device->card_type >= GM100)
68		addr = nvkm_rd32(device, 0x021c04);
69	else
70	if (device->card_type >= NV_C0)
71		addr = nvkm_rd32(device, 0x022500);
72	if (addr & 0x00000001) {
73		nvkm_debug(subdev, "... display disabled\n");
74		return ERR_PTR(-ENODEV);
75	}
76
77	/* check that the window is enabled and in vram, particularly
78	 * important as we don't want to be touching vram on an
79	 * uninitialised board
80	 */
81	addr = nvkm_rd32(device, 0x619f04);
82	if (!(addr & 0x00000008)) {
83		nvkm_debug(subdev, "... not enabled\n");
84		return ERR_PTR(-ENODEV);
85	}
86	if ( (addr & 0x00000003) != 1) {
87		nvkm_debug(subdev, "... not in vram\n");
88		return ERR_PTR(-ENODEV);
89	}
90
91	/* some alternate method inherited from xf86-video-nv... */
92	addr = (addr & 0xffffff00) << 8;
93	if (!addr) {
94		addr  = (u64)nvkm_rd32(device, 0x001700) << 16;
95		addr += 0xf0000;
96	}
97
98	/* modify bar0 PRAMIN window to cover the bios image */
99	if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
100		nvkm_error(subdev, "... out of memory\n");
101		return ERR_PTR(-ENOMEM);
102	}
103
104	priv->bios = bios;
105	priv->bar0 = nvkm_rd32(device, 0x001700);
106	nvkm_wr32(device, 0x001700, addr >> 16);
107	return priv;
108}
109
110const struct nvbios_source
111nvbios_ramin = {
112	.name = "PRAMIN",
113	.init = pramin_init,
114	.fini = pramin_fini,
115	.read = pramin_read,
116	.rw = true,
117};
118