shadowramin.c

  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 >= GA100)
 68		addr = device->chipset == 0x170; /*XXX: find the fuse reg for this */
 69	else
 70	if (device->card_type >= GM100)
 71		addr = nvkm_rd32(device, 0x021c04);
 72	else
 73	if (device->card_type >= NV_C0)
 74		addr = nvkm_rd32(device, 0x022500);
 75	if (addr & 0x00000001) {
 76		nvkm_debug(subdev, "... display disabled\n");
 77		return ERR_PTR(-ENODEV);
 78	}
 79
 80	/* check that the window is enabled and in vram, particularly
 81	 * important as we don't want to be touching vram on an
 82	 * uninitialised board
 83	 */
 84	if (device->card_type >= GV100)
 85		addr = nvkm_rd32(device, 0x625f04);
 86	else
 87		addr = nvkm_rd32(device, 0x619f04);
 88	if (!(addr & 0x00000008)) {
 89		nvkm_debug(subdev, "... not enabled\n");
 90		return ERR_PTR(-ENODEV);
 91	}
 92	if ( (addr & 0x00000003) != 1) {
 93		nvkm_debug(subdev, "... not in vram\n");
 94		return ERR_PTR(-ENODEV);
 95	}
 96
 97	/* some alternate method inherited from xf86-video-nv... */
 98	addr = (addr & 0xffffff00) << 8;
 99	if (!addr) {
100		addr  = (u64)nvkm_rd32(device, 0x001700) << 16;
101		addr += 0xf0000;
102	}
103
104	/* modify bar0 PRAMIN window to cover the bios image */
105	if (!(priv = kmalloc(sizeof(*priv), GFP_KERNEL))) {
106		nvkm_error(subdev, "... out of memory\n");
107		return ERR_PTR(-ENOMEM);
108	}
109
110	priv->bios = bios;
111	priv->bar0 = nvkm_rd32(device, 0x001700);
112	nvkm_wr32(device, 0x001700, addr >> 16);
113	return priv;
114}
115
116const struct nvbios_source
117nvbios_ramin = {
118	.name = "PRAMIN",
119	.init = pramin_init,
120	.fini = pramin_fini,
121	.read = pramin_read,
122	.rw = true,
123};