1 /* $NetBSD: nouveau_nvkm_subdev_bios_shadowof.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $ */
2
3 /*
4 * Copyright 2012 Red Hat Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 *
24 */
25 #include <sys/cdefs.h>
26 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_shadowof.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
27
28 #include "priv.h"
29
30 #include <core/pci.h>
31
32 #ifdef __NetBSD__
33 # define __iomem __of_rom_iomem
34 #endif
35
36 #if defined(__powerpc__)
37 struct priv {
38 const void __iomem *data;
39 int size;
40 };
41
42 static u32
of_read(void * data,u32 offset,u32 length,struct nvkm_bios * bios)43 of_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
44 {
45 struct priv *priv = data;
46 if (offset < priv->size) {
47 length = min_t(u32, length, priv->size - offset);
48 memcpy_fromio(bios->data + offset, priv->data + offset, length);
49 return length;
50 }
51 return 0;
52 }
53
54 static u32
of_size(void * data)55 of_size(void *data)
56 {
57 struct priv *priv = data;
58 return priv->size;
59 }
60
61 static void *
of_init(struct nvkm_bios * bios,const char * name)62 of_init(struct nvkm_bios *bios, const char *name)
63 {
64 struct nvkm_device *device = bios->subdev.device;
65 struct pci_dev *pdev = device->func->pci(device)->pdev;
66 struct device_node *dn;
67 struct priv *priv;
68 if (!(dn = pci_device_to_OF_node(pdev)))
69 return ERR_PTR(-ENODEV);
70 if (!(priv = kzalloc(sizeof(*priv), GFP_KERNEL)))
71 return ERR_PTR(-ENOMEM);
72 if ((priv->data = of_get_property(dn, "NVDA,BMP", &priv->size)))
73 return priv;
74 kfree(priv);
75 return ERR_PTR(-EINVAL);
76 }
77
78 const struct nvbios_source
79 nvbios_of = {
80 .name = "OpenFirmware",
81 .init = of_init,
82 .fini = (void(*)(void *))kfree,
83 .read = of_read,
84 .size = of_size,
85 .rw = false,
86 .ignore_checksum = true,
87 .no_pcir = true,
88 };
89 #else
90 const struct nvbios_source
91 nvbios_of = {
92 };
93 #endif
94