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      1 /*	$NetBSD: nouveau_nvkm_subdev_bios_ramcfg.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright 2013 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_ramcfg.c,v 1.3 2021/12/18 23:45:38 riastradh Exp $");
     28 
     29 #include <subdev/bios.h>
     30 #include <subdev/bios/bit.h>
     31 #include <subdev/bios/ramcfg.h>
     32 #include <subdev/bios/M0203.h>
     33 
     34 static u8
     35 nvbios_ramcfg_strap(struct nvkm_subdev *subdev)
     36 {
     37 	return (nvkm_rd32(subdev->device, 0x101000) & 0x0000003c) >> 2;
     38 }
     39 
     40 u8
     41 nvbios_ramcfg_count(struct nvkm_bios *bios)
     42 {
     43 	struct bit_entry bit_M;
     44 
     45 	if (!bit_entry(bios, 'M', &bit_M)) {
     46 		if (bit_M.version == 1 && bit_M.length >= 5)
     47 			return nvbios_rd08(bios, bit_M.offset + 2);
     48 		if (bit_M.version == 2 && bit_M.length >= 3)
     49 			return nvbios_rd08(bios, bit_M.offset + 0);
     50 	}
     51 
     52 	return 0x00;
     53 }
     54 
     55 u8
     56 nvbios_ramcfg_index(struct nvkm_subdev *subdev)
     57 {
     58 	struct nvkm_bios *bios = subdev->device->bios;
     59 	u8 strap = nvbios_ramcfg_strap(subdev);
     60 	u32 xlat = 0x00000000;
     61 	struct bit_entry bit_M;
     62 	struct nvbios_M0203E M0203E;
     63 	u8 ver, hdr;
     64 
     65 	if (!bit_entry(bios, 'M', &bit_M)) {
     66 		if (bit_M.version == 1 && bit_M.length >= 5)
     67 			xlat = nvbios_rd16(bios, bit_M.offset + 3);
     68 		if (bit_M.version == 2 && bit_M.length >= 3) {
     69 			/*XXX: is M ever shorter than this?
     70 			 *     if not - what is xlat used for now?
     71 			 *     also - sigh..
     72 			 */
     73 			if (bit_M.length >= 7 &&
     74 			    nvbios_M0203Em(bios, strap, &ver, &hdr, &M0203E))
     75 				return M0203E.group;
     76 			xlat = nvbios_rd16(bios, bit_M.offset + 1);
     77 		}
     78 	}
     79 
     80 	if (xlat)
     81 		strap = nvbios_rd08(bios, xlat + strap);
     82 	return strap;
     83 }
     84