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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_shadowrom.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_shadowrom.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
     27 
     28 #include "priv.h"
     29 
     30 #include <subdev/pci.h>
     31 
     32 static u32
     33 prom_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
     34 {
     35 	struct nvkm_device *device = data;
     36 	u32 i;
     37 	if (offset + length <= 0x00100000) {
     38 		for (i = offset; i < offset + length; i += 4)
     39 			*(u32 *)&bios->data[i] = nvkm_rd32(device, 0x300000 + i);
     40 		return length;
     41 	}
     42 	return 0;
     43 }
     44 
     45 static void
     46 prom_fini(void *data)
     47 {
     48 	struct nvkm_device *device = data;
     49 	nvkm_pci_rom_shadow(device->pci, true);
     50 }
     51 
     52 static void *
     53 prom_init(struct nvkm_bios *bios, const char *name)
     54 {
     55 	struct nvkm_device *device = bios->subdev.device;
     56 	if (device->card_type == NV_40 && device->chipset >= 0x4c)
     57 		return ERR_PTR(-ENODEV);
     58 	nvkm_pci_rom_shadow(device->pci, false);
     59 	return device;
     60 }
     61 
     62 const struct nvbios_source
     63 nvbios_rom = {
     64 	.name = "PROM",
     65 	.init = prom_init,
     66 	.fini = prom_fini,
     67 	.read = prom_read,
     68 	.rw = false,
     69 };
     70