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 
25 #include <core/pci.h>
26 
27 #if defined(__powerpc__)
28 struct priv {
29 	const void __iomem *data;
30 	int size;
31 };
32 
33 static u32
34 of_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
35 {
36 	struct priv *priv = data;
37 	if (offset < priv->size) {
38 		length = min_t(u32, length, priv->size - offset);
39 		memcpy_fromio(bios->data + offset, priv->data + offset, length);
40 		return length;
41 	}
42 	return 0;
43 }
44 
45 static u32
46 of_size(void *data)
47 {
48 	struct priv *priv = data;
49 	return priv->size;
50 }
51 
52 static void *
53 of_init(struct nvkm_bios *bios, const char *name)
54 {
55 	struct nvkm_device *device = bios->subdev.device;
56 	struct pci_dev *pdev = device->func->pci(device)->pdev;
57 	struct device_node *dn;
58 	struct priv *priv;
59 	if (!(dn = pci_device_to_OF_node(pdev)))
60 		return ERR_PTR(-ENODEV);
61 	if (!(priv = kzalloc(sizeof(*priv), GFP_KERNEL)))
62 		return ERR_PTR(-ENOMEM);
63 	if ((priv->data = of_get_property(dn, "NVDA,BMP", &priv->size)))
64 		return priv;
65 	kfree(priv);
66 	return ERR_PTR(-EINVAL);
67 }
68 
69 static void of_fini(void *p)
70 {
71 	kfree(p);
72 }
73 
74 const struct nvbios_source
75 nvbios_of = {
76 	.name = "OpenFirmware",
77 	.init = of_init,
78 	.fini = of_fini,
79 	.read = of_read,
80 	.size = of_size,
81 	.rw = false,
82 	.ignore_checksum = true,
83 	.no_pcir = true,
84 };
85 #else
86 const struct nvbios_source
87 nvbios_of = {
88 };
89 #endif
90