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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_npde.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2014 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  * Authors: Ben Skeggs <bskeggs (at) redhat.com>
     25  */
     26 #include <sys/cdefs.h>
     27 __KERNEL_RCSID(0, "$NetBSD: nouveau_nvkm_subdev_bios_npde.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include <subdev/bios.h>
     30 #include <subdev/bios/npde.h>
     31 #include <subdev/bios/pcir.h>
     32 
     33 u32
     34 nvbios_npdeTe(struct nvkm_bios *bios, u32 base)
     35 {
     36 	struct nvbios_pcirT pcir;
     37 	u8  ver; u16 hdr;
     38 	u32 data = nvbios_pcirTp(bios, base, &ver, &hdr, &pcir);
     39 	if (data = (data + hdr + 0x0f) & ~0x0f, data) {
     40 		switch (nvbios_rd32(bios, data + 0x00)) {
     41 		case 0x4544504e: /* NPDE */
     42 			break;
     43 		default:
     44 			nvkm_debug(&bios->subdev,
     45 				   "%08x: NPDE signature (%08x) unknown\n",
     46 				   data, nvbios_rd32(bios, data + 0x00));
     47 			data = 0;
     48 			break;
     49 		}
     50 	}
     51 	return data;
     52 }
     53 
     54 u32
     55 nvbios_npdeTp(struct nvkm_bios *bios, u32 base, struct nvbios_npdeT *info)
     56 {
     57 	u32 data = nvbios_npdeTe(bios, base);
     58 	memset(info, 0x00, sizeof(*info));
     59 	if (data) {
     60 		info->image_size = nvbios_rd16(bios, data + 0x08) * 512;
     61 		info->last = nvbios_rd08(bios, data + 0x0a) & 0x80;
     62 	}
     63 	return data;
     64 }
     65