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      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
     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
     55 of_size(void *data)
     56 {
     57 	struct priv *priv = data;
     58 	return priv->size;
     59 }
     60 
     61 static void *
     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